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-rw-r--r--Documentation/DocBook/kgdb.tmpl692
-rw-r--r--Documentation/kernel-parameters.txt14
-rw-r--r--MAINTAINERS6
-rw-r--r--arch/arm/include/asm/kmap_types.h1
-rw-r--r--arch/arm/kernel/kgdb.c5
-rw-r--r--arch/blackfin/kernel/kgdb.c5
-rw-r--r--arch/mips/include/asm/kgdb.h2
-rw-r--r--arch/mips/kernel/kgdb.c27
-rw-r--r--arch/mips/kernel/traps.c13
-rw-r--r--arch/powerpc/include/asm/kmap_types.h1
-rw-r--r--arch/powerpc/kernel/kgdb.c11
-rw-r--r--arch/powerpc/kernel/traps.c7
-rw-r--r--arch/sh/kernel/kgdb.c14
-rw-r--r--arch/sparc/kernel/kgdb_32.c6
-rw-r--r--arch/sparc/kernel/kgdb_64.c6
-rw-r--r--arch/x86/include/asm/kgdb.h3
-rw-r--r--arch/x86/kernel/kgdb.c56
-rw-r--r--arch/x86/kernel/traps.c6
-rw-r--r--drivers/serial/8250.c4
-rw-r--r--drivers/serial/amba-pl011.c6
-rw-r--r--drivers/serial/kgdboc.c75
-rw-r--r--drivers/serial/sh-sci.c6
-rw-r--r--drivers/serial/sunzilog.c50
-rw-r--r--include/asm-generic/kmap_types.h3
-rw-r--r--include/linux/kdb.h117
-rw-r--r--include/linux/kgdb.h41
-rw-r--r--include/linux/serial_core.h1
-rw-r--r--init/main.c2
-rw-r--r--kernel/Makefile2
-rw-r--r--kernel/debug/Makefile6
-rw-r--r--kernel/debug/debug_core.c967
-rw-r--r--kernel/debug/debug_core.h81
-rw-r--r--kernel/debug/gdbstub.c1017
-rw-r--r--kernel/debug/kdb/.gitignore1
-rw-r--r--kernel/debug/kdb/Makefile25
-rw-r--r--kernel/debug/kdb/kdb_bp.c564
-rw-r--r--kernel/debug/kdb/kdb_bt.c210
-rw-r--r--kernel/debug/kdb/kdb_cmds35
-rw-r--r--kernel/debug/kdb/kdb_debugger.c169
-rw-r--r--kernel/debug/kdb/kdb_io.c826
-rw-r--r--kernel/debug/kdb/kdb_keyboard.c212
-rw-r--r--kernel/debug/kdb/kdb_main.c2849
-rw-r--r--kernel/debug/kdb/kdb_private.h300
-rw-r--r--kernel/debug/kdb/kdb_support.c927
-rw-r--r--kernel/kallsyms.c21
-rw-r--r--kernel/kgdb.c1764
-rw-r--r--kernel/module.c4
-rw-r--r--kernel/printk.c25
-rw-r--r--kernel/sched.c7
-rw-r--r--kernel/signal.c40
-rw-r--r--lib/Kconfig.kgdb24
51 files changed, 9240 insertions, 2016 deletions
diff --git a/Documentation/DocBook/kgdb.tmpl b/Documentation/DocBook/kgdb.tmpl
index 5cff41a5fa7c..55f12ac37acd 100644
--- a/Documentation/DocBook/kgdb.tmpl
+++ b/Documentation/DocBook/kgdb.tmpl
@@ -4,7 +4,7 @@
4 4
5<book id="kgdbOnLinux"> 5<book id="kgdbOnLinux">
6 <bookinfo> 6 <bookinfo>
7 <title>Using kgdb and the kgdb Internals</title> 7 <title>Using kgdb, kdb and the kernel debugger internals</title>
8 8
9 <authorgroup> 9 <authorgroup>
10 <author> 10 <author>
@@ -17,33 +17,8 @@
17 </affiliation> 17 </affiliation>
18 </author> 18 </author>
19 </authorgroup> 19 </authorgroup>
20
21 <authorgroup>
22 <author>
23 <firstname>Tom</firstname>
24 <surname>Rini</surname>
25 <affiliation>
26 <address>
27 <email>trini@kernel.crashing.org</email>
28 </address>
29 </affiliation>
30 </author>
31 </authorgroup>
32
33 <authorgroup>
34 <author>
35 <firstname>Amit S.</firstname>
36 <surname>Kale</surname>
37 <affiliation>
38 <address>
39 <email>amitkale@linsyssoft.com</email>
40 </address>
41 </affiliation>
42 </author>
43 </authorgroup>
44
45 <copyright> 20 <copyright>
46 <year>2008</year> 21 <year>2008,2010</year>
47 <holder>Wind River Systems, Inc.</holder> 22 <holder>Wind River Systems, Inc.</holder>
48 </copyright> 23 </copyright>
49 <copyright> 24 <copyright>
@@ -69,41 +44,76 @@
69 <chapter id="Introduction"> 44 <chapter id="Introduction">
70 <title>Introduction</title> 45 <title>Introduction</title>
71 <para> 46 <para>
72 kgdb is a source level debugger for linux kernel. It is used along 47 The kernel has two different debugger front ends (kdb and kgdb)
73 with gdb to debug a linux kernel. The expectation is that gdb can 48 which interface to the debug core. It is possible to use either
74 be used to "break in" to the kernel to inspect memory, variables 49 of the debugger front ends and dynamically transition between them
75 and look through call stack information similar to what an 50 if you configure the kernel properly at compile and runtime.
76 application developer would use gdb for. It is possible to place 51 </para>
77 breakpoints in kernel code and perform some limited execution 52 <para>
78 stepping. 53 Kdb is simplistic shell-style interface which you can use on a
54 system console with a keyboard or serial console. You can use it
55 to inspect memory, registers, process lists, dmesg, and even set
56 breakpoints to stop in a certain location. Kdb is not a source
57 level debugger, although you can set breakpoints and execute some
58 basic kernel run control. Kdb is mainly aimed at doing some
59 analysis to aid in development or diagnosing kernel problems. You
60 can access some symbols by name in kernel built-ins or in kernel
61 modules if the code was built
62 with <symbol>CONFIG_KALLSYMS</symbol>.
63 </para>
64 <para>
65 Kgdb is intended to be used as a source level debugger for the
66 Linux kernel. It is used along with gdb to debug a Linux kernel.
67 The expectation is that gdb can be used to "break in" to the
68 kernel to inspect memory, variables and look through call stack
69 information similar to the way an application developer would use
70 gdb to debug an application. It is possible to place breakpoints
71 in kernel code and perform some limited execution stepping.
79 </para> 72 </para>
80 <para> 73 <para>
81 Two machines are required for using kgdb. One of these machines is a 74 Two machines are required for using kgdb. One of these machines is
82 development machine and the other is a test machine. The kernel 75 a development machine and the other is the target machine. The
83 to be debugged runs on the test machine. The development machine 76 kernel to be debugged runs on the target machine. The development
84 runs an instance of gdb against the vmlinux file which contains 77 machine runs an instance of gdb against the vmlinux file which
85 the symbols (not boot image such as bzImage, zImage, uImage...). 78 contains the symbols (not boot image such as bzImage, zImage,
86 In gdb the developer specifies the connection parameters and 79 uImage...). In gdb the developer specifies the connection
87 connects to kgdb. The type of connection a developer makes with 80 parameters and connects to kgdb. The type of connection a
88 gdb depends on the availability of kgdb I/O modules compiled as 81 developer makes with gdb depends on the availability of kgdb I/O
89 builtin's or kernel modules in the test machine's kernel. 82 modules compiled as built-ins or loadable kernel modules in the test
83 machine's kernel.
90 </para> 84 </para>
91 </chapter> 85 </chapter>
92 <chapter id="CompilingAKernel"> 86 <chapter id="CompilingAKernel">
93 <title>Compiling a kernel</title> 87 <title>Compiling a kernel</title>
88 <para>
89 <itemizedlist>
90 <listitem><para>In order to enable compilation of kdb, you must first enable kgdb.</para></listitem>
91 <listitem><para>The kgdb test compile options are described in the kgdb test suite chapter.</para></listitem>
92 </itemizedlist>
93 </para>
94 <sect1 id="CompileKGDB">
95 <title>Kernel config options for kgdb</title>
94 <para> 96 <para>
95 To enable <symbol>CONFIG_KGDB</symbol> you should first turn on 97 To enable <symbol>CONFIG_KGDB</symbol> you should first turn on
96 "Prompt for development and/or incomplete code/drivers" 98 "Prompt for development and/or incomplete code/drivers"
97 (CONFIG_EXPERIMENTAL) in "General setup", then under the 99 (CONFIG_EXPERIMENTAL) in "General setup", then under the
98 "Kernel debugging" select "KGDB: kernel debugging with remote gdb". 100 "Kernel debugging" select "KGDB: kernel debugger".
101 </para>
102 <para>
103 While it is not a hard requirement that you have symbols in your
104 vmlinux file, gdb tends not to be very useful without the symbolic
105 data, so you will want to turn
106 on <symbol>CONFIG_DEBUG_INFO</symbol> which is called "Compile the
107 kernel with debug info" in the config menu.
99 </para> 108 </para>
100 <para> 109 <para>
101 It is advised, but not required that you turn on the 110 It is advised, but not required that you turn on the
102 CONFIG_FRAME_POINTER kernel option. This option inserts code to 111 <symbol>CONFIG_FRAME_POINTER</symbol> kernel option which is called "Compile the
103 into the compiled executable which saves the frame information in 112 kernel with frame pointers" in the config menu. This option
104 registers or on the stack at different points which will allow a 113 inserts code to into the compiled executable which saves the frame
105 debugger such as gdb to more accurately construct stack back traces 114 information in registers or on the stack at different points which
106 while debugging the kernel. 115 allows a debugger such as gdb to more accurately construct
116 stack back traces while debugging the kernel.
107 </para> 117 </para>
108 <para> 118 <para>
109 If the architecture that you are using supports the kernel option 119 If the architecture that you are using supports the kernel option
@@ -116,38 +126,160 @@
116 this option. 126 this option.
117 </para> 127 </para>
118 <para> 128 <para>
119 Next you should choose one of more I/O drivers to interconnect debugging 129 Next you should choose one of more I/O drivers to interconnect
120 host and debugged target. Early boot debugging requires a KGDB 130 debugging host and debugged target. Early boot debugging requires
121 I/O driver that supports early debugging and the driver must be 131 a KGDB I/O driver that supports early debugging and the driver
122 built into the kernel directly. Kgdb I/O driver configuration 132 must be built into the kernel directly. Kgdb I/O driver
123 takes place via kernel or module parameters, see following 133 configuration takes place via kernel or module parameters which
124 chapter. 134 you can learn more about in the in the section that describes the
135 parameter "kgdboc".
125 </para> 136 </para>
126 <para> 137 <para>Here is an example set of .config symbols to enable or
127 The kgdb test compile options are described in the kgdb test suite chapter. 138 disable for kgdb:
139 <itemizedlist>
140 <listitem><para># CONFIG_DEBUG_RODATA is not set</para></listitem>
141 <listitem><para>CONFIG_FRAME_POINTER=y</para></listitem>
142 <listitem><para>CONFIG_KGDB=y</para></listitem>
143 <listitem><para>CONFIG_KGDB_SERIAL_CONSOLE=y</para></listitem>
144 </itemizedlist>
128 </para> 145 </para>
129 146 </sect1>
147 <sect1 id="CompileKDB">
148 <title>Kernel config options for kdb</title>
149 <para>Kdb is quite a bit more complex than the simple gdbstub
150 sitting on top of the kernel's debug core. Kdb must implement a
151 shell, and also adds some helper functions in other parts of the
152 kernel, responsible for printing out interesting data such as what
153 you would see if you ran "lsmod", or "ps". In order to build kdb
154 into the kernel you follow the same steps as you would for kgdb.
155 </para>
156 <para>The main config option for kdb
157 is <symbol>CONFIG_KGDB_KDB</symbol> which is called "KGDB_KDB:
158 include kdb frontend for kgdb" in the config menu. In theory you
159 would have already also selected an I/O driver such as the
160 CONFIG_KGDB_SERIAL_CONSOLE interface if you plan on using kdb on a
161 serial port, when you were configuring kgdb.
162 </para>
163 <para>If you want to use a PS/2-style keyboard with kdb, you would
164 select CONFIG_KDB_KEYBOARD which is called "KGDB_KDB: keyboard as
165 input device" in the config menu. The CONFIG_KDB_KEYBOARD option
166 is not used for anything in the gdb interface to kgdb. The
167 CONFIG_KDB_KEYBOARD option only works with kdb.
168 </para>
169 <para>Here is an example set of .config symbols to enable/disable kdb:
170 <itemizedlist>
171 <listitem><para># CONFIG_DEBUG_RODATA is not set</para></listitem>
172 <listitem><para>CONFIG_FRAME_POINTER=y</para></listitem>
173 <listitem><para>CONFIG_KGDB=y</para></listitem>
174 <listitem><para>CONFIG_KGDB_SERIAL_CONSOLE=y</para></listitem>
175 <listitem><para>CONFIG_KGDB_KDB=y</para></listitem>
176 <listitem><para>CONFIG_KDB_KEYBOARD=y</para></listitem>
177 </itemizedlist>
178 </para>
179 </sect1>
130 </chapter> 180 </chapter>
131 <chapter id="EnableKGDB"> 181 <chapter id="kgdbKernelArgs">
132 <title>Enable kgdb for debugging</title> 182 <title>Kernel Debugger Boot Arguments</title>
133 <para> 183 <para>This section describes the various runtime kernel
134 In order to use kgdb you must activate it by passing configuration 184 parameters that affect the configuration of the kernel debugger.
135 information to one of the kgdb I/O drivers. If you do not pass any 185 The following chapter covers using kdb and kgdb as well as
136 configuration information kgdb will not do anything at all. Kgdb 186 provides some examples of the configuration parameters.</para>
137 will only actively hook up to the kernel trap hooks if a kgdb I/O 187 <sect1 id="kgdboc">
138 driver is loaded and configured. If you unconfigure a kgdb I/O 188 <title>Kernel parameter: kgdboc</title>
139 driver, kgdb will unregister all the kernel hook points. 189 <para>The kgdboc driver was originally an abbreviation meant to
190 stand for "kgdb over console". Today it is the primary mechanism
191 to configure how to communicate from gdb to kgdb as well as the
192 devices you want to use to interact with the kdb shell.
193 </para>
194 <para>For kgdb/gdb, kgdboc is designed to work with a single serial
195 port. It is intended to cover the circumstance where you want to
196 use a serial console as your primary console as well as using it to
197 perform kernel debugging. It is also possible to use kgdb on a
198 serial port which is not designated as a system console. Kgdboc
199 may be configured as a kernel built-in or a kernel loadable module.
200 You can only make use of <constant>kgdbwait</constant> and early
201 debugging if you build kgdboc into the kernel as a built-in.
140 </para> 202 </para>
203 <sect2 id="kgdbocArgs">
204 <title>kgdboc arguments</title>
205 <para>Usage: <constant>kgdboc=[kbd][[,]serial_device][,baud]</constant></para>
206 <sect3 id="kgdbocArgs1">
207 <title>Using loadable module or built-in</title>
141 <para> 208 <para>
142 All drivers can be reconfigured at run time, if 209 <orderedlist>
143 <symbol>CONFIG_SYSFS</symbol> and <symbol>CONFIG_MODULES</symbol> 210 <listitem><para>As a kernel built-in:</para>
144 are enabled, by echo'ing a new config string to 211 <para>Use the kernel boot argument: <constant>kgdboc=&lt;tty-device&gt;,[baud]</constant></para></listitem>
145 <constant>/sys/module/&lt;driver&gt;/parameter/&lt;option&gt;</constant>. 212 <listitem>
146 The driver can be unconfigured by passing an empty string. You cannot 213 <para>As a kernel loadable module:</para>
147 change the configuration while the debugger is attached. Make sure 214 <para>Use the command: <constant>modprobe kgdboc kgdboc=&lt;tty-device&gt;,[baud]</constant></para>
148 to detach the debugger with the <constant>detach</constant> command 215 <para>Here are two examples of how you might formate the kgdboc
149 prior to trying unconfigure a kgdb I/O driver. 216 string. The first is for an x86 target using the first serial port.
217 The second example is for the ARM Versatile AB using the second
218 serial port.
219 <orderedlist>
220 <listitem><para><constant>kgdboc=ttyS0,115200</constant></para></listitem>
221 <listitem><para><constant>kgdboc=ttyAMA1,115200</constant></para></listitem>
222 </orderedlist>
150 </para> 223 </para>
224 </listitem>
225 </orderedlist></para>
226 </sect3>
227 <sect3 id="kgdbocArgs2">
228 <title>Configure kgdboc at runtime with sysfs</title>
229 <para>At run time you can enable or disable kgdboc by echoing a
230 parameters into the sysfs. Here are two examples:</para>
231 <orderedlist>
232 <listitem><para>Enable kgdboc on ttyS0</para>
233 <para><constant>echo ttyS0 &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem>
234 <listitem><para>Disable kgdboc</para>
235 <para><constant>echo "" &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem>
236 </orderedlist>
237 <para>NOTE: You do not need to specify the baud if you are
238 configuring the console on tty which is already configured or
239 open.</para>
240 </sect3>
241 <sect3 id="kgdbocArgs3">
242 <title>More examples</title>
243 <para>You can configure kgdboc to use the keyboard, and or a serial device
244 depending on if you are using kdb and or kgdb, in one of the
245 following scenarios.
246 <orderedlist>
247 <listitem><para>kdb and kgdb over only a serial port</para>
248 <para><constant>kgdboc=&lt;serial_device&gt;[,baud]</constant></para>
249 <para>Example: <constant>kgdboc=ttyS0,115200</constant></para>
250 </listitem>
251 <listitem><para>kdb and kgdb with keyboard and a serial port</para>
252 <para><constant>kgdboc=kbd,&lt;serial_device&gt;[,baud]</constant></para>
253 <para>Example: <constant>kgdboc=kbd,ttyS0,115200</constant></para>
254 </listitem>
255 <listitem><para>kdb with a keyboard</para>
256 <para><constant>kgdboc=kbd</constant></para>
257 </listitem>
258 </orderedlist>
259 </para>
260 </sect3>
261 <para>NOTE: Kgdboc does not support interrupting the target via the
262 gdb remote protocol. You must manually send a sysrq-g unless you
263 have a proxy that splits console output to a terminal program.
264 A console proxy has a separate TCP port for the debugger and a separate
265 TCP port for the "human" console. The proxy can take care of sending
266 the sysrq-g for you.
267 </para>
268 <para>When using kgdboc with no debugger proxy, you can end up
269 connecting the debugger at one of two entry points. If an
270 exception occurs after you have loaded kgdboc, a message should
271 print on the console stating it is waiting for the debugger. In
272 this case you disconnect your terminal program and then connect the
273 debugger in its place. If you want to interrupt the target system
274 and forcibly enter a debug session you have to issue a Sysrq
275 sequence and then type the letter <constant>g</constant>. Then
276 you disconnect the terminal session and connect gdb. Your options
277 if you don't like this are to hack gdb to send the sysrq-g for you
278 as well as on the initial connect, or to use a debugger proxy that
279 allows an unmodified gdb to do the debugging.
280 </para>
281 </sect2>
282 </sect1>
151 <sect1 id="kgdbwait"> 283 <sect1 id="kgdbwait">
152 <title>Kernel parameter: kgdbwait</title> 284 <title>Kernel parameter: kgdbwait</title>
153 <para> 285 <para>
@@ -162,103 +294,204 @@
162 </para> 294 </para>
163 <para> 295 <para>
164 The kernel will stop and wait as early as the I/O driver and 296 The kernel will stop and wait as early as the I/O driver and
165 architecture will allow when you use this option. If you build the 297 architecture allows when you use this option. If you build the
166 kgdb I/O driver as a kernel module kgdbwait will not do anything. 298 kgdb I/O driver as a loadable kernel module kgdbwait will not do
299 anything.
167 </para> 300 </para>
168 </sect1> 301 </sect1>
169 <sect1 id="kgdboc"> 302 <sect1 id="kgdbcon">
170 <title>Kernel parameter: kgdboc</title> 303 <title>Kernel parameter: kgdbcon</title>
171 <para> 304 <para> The kgdbcon feature allows you to see printk() messages
172 The kgdboc driver was originally an abbreviation meant to stand for 305 inside gdb while gdb is connected to the kernel. Kdb does not make
173 "kgdb over console". Kgdboc is designed to work with a single 306 use of the kgdbcon feature.
174 serial port. It was meant to cover the circumstance 307 </para>
175 where you wanted to use a serial console as your primary console as 308 <para>Kgdb supports using the gdb serial protocol to send console
176 well as using it to perform kernel debugging. Of course you can 309 messages to the debugger when the debugger is connected and running.
177 also use kgdboc without assigning a console to the same port. 310 There are two ways to activate this feature.
311 <orderedlist>
312 <listitem><para>Activate with the kernel command line option:</para>
313 <para><constant>kgdbcon</constant></para>
314 </listitem>
315 <listitem><para>Use sysfs before configuring an I/O driver</para>
316 <para>
317 <constant>echo 1 &gt; /sys/module/kgdb/parameters/kgdb_use_con</constant>
318 </para>
319 <para>
320 NOTE: If you do this after you configure the kgdb I/O driver, the
321 setting will not take effect until the next point the I/O is
322 reconfigured.
323 </para>
324 </listitem>
325 </orderedlist>
326 <para>IMPORTANT NOTE: You cannot use kgdboc + kgdbcon on a tty that is an
327 active system console. An example incorrect usage is <constant>console=ttyS0,115200 kgdboc=ttyS0 kgdbcon</constant>
328 </para>
329 <para>It is possible to use this option with kgdboc on a tty that is not a system console.
330 </para>
178 </para> 331 </para>
179 <sect2 id="UsingKgdboc"> 332 </sect1>
180 <title>Using kgdboc</title> 333 </chapter>
181 <para> 334 <chapter id="usingKDB">
182 You can configure kgdboc via sysfs or a module or kernel boot line 335 <title>Using kdb</title>
183 parameter depending on if you build with CONFIG_KGDBOC as a module
184 or built-in.
185 <orderedlist>
186 <listitem><para>From the module load or build-in</para>
187 <para><constant>kgdboc=&lt;tty-device&gt;,[baud]</constant></para>
188 <para> 336 <para>
189 The example here would be if your console port was typically ttyS0, you would use something like <constant>kgdboc=ttyS0,115200</constant> or on the ARM Versatile AB you would likely use <constant>kgdboc=ttyAMA0,115200</constant> 337 </para>
338 <sect1 id="quickKDBserial">
339 <title>Quick start for kdb on a serial port</title>
340 <para>This is a quick example of how to use kdb.</para>
341 <para><orderedlist>
342 <listitem><para>Boot kernel with arguments:
343 <itemizedlist>
344 <listitem><para><constant>console=ttyS0,115200 kgdboc=ttyS0,115200</constant></para></listitem>
345 </itemizedlist></para>
346 <para>OR</para>
347 <para>Configure kgdboc after the kernel booted; assuming you are using a serial port console:
348 <itemizedlist>
349 <listitem><para><constant>echo ttyS0 &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem>
350 </itemizedlist>
190 </para> 351 </para>
191 </listitem> 352 </listitem>
192 <listitem><para>From sysfs</para> 353 <listitem><para>Enter the kernel debugger manually or by waiting for an oops or fault. There are several ways you can enter the kernel debugger manually; all involve using the sysrq-g, which means you must have enabled CONFIG_MAGIC_SYSRQ=y in your kernel config.</para>
193 <para><constant>echo ttyS0 &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para> 354 <itemizedlist>
355 <listitem><para>When logged in as root or with a super user session you can run:</para>
356 <para><constant>echo g &gt; /proc/sysrq-trigger</constant></para></listitem>
357 <listitem><para>Example using minicom 2.2</para>
358 <para>Press: <constant>Control-a</constant></para>
359 <para>Press: <constant>f</constant></para>
360 <para>Press: <constant>g</constant></para>
194 </listitem> 361 </listitem>
195 </orderedlist> 362 <listitem><para>When you have telneted to a terminal server that supports sending a remote break</para>
196 </para> 363 <para>Press: <constant>Control-]</constant></para>
197 <para> 364 <para>Type in:<constant>send break</constant></para>
198 NOTE: Kgdboc does not support interrupting the target via the 365 <para>Press: <constant>Enter</constant></para>
199 gdb remote protocol. You must manually send a sysrq-g unless you 366 <para>Press: <constant>g</constant></para>
200 have a proxy that splits console output to a terminal problem and 367 </listitem>
201 has a separate port for the debugger to connect to that sends the 368 </itemizedlist>
202 sysrq-g for you. 369 </listitem>
370 <listitem><para>From the kdb prompt you can run the "help" command to see a complete list of the commands that are available.</para>
371 <para>Some useful commands in kdb include:
372 <itemizedlist>
373 <listitem><para>lsmod -- Shows where kernel modules are loaded</para></listitem>
374 <listitem><para>ps -- Displays only the active processes</para></listitem>
375 <listitem><para>ps A -- Shows all the processes</para></listitem>
376 <listitem><para>summary -- Shows kernel version info and memory usage</para></listitem>
377 <listitem><para>bt -- Get a backtrace of the current process using dump_stack()</para></listitem>
378 <listitem><para>dmesg -- View the kernel syslog buffer</para></listitem>
379 <listitem><para>go -- Continue the system</para></listitem>
380 </itemizedlist>
203 </para> 381 </para>
204 <para>When using kgdboc with no debugger proxy, you can end up 382 </listitem>
205 connecting the debugger for one of two entry points. If an 383 <listitem>
206 exception occurs after you have loaded kgdboc a message should print 384 <para>When you are done using kdb you need to consider rebooting the
207 on the console stating it is waiting for the debugger. In case you 385 system or using the "go" command to resuming normal kernel
208 disconnect your terminal program and then connect the debugger in 386 execution. If you have paused the kernel for a lengthy period of
209 its place. If you want to interrupt the target system and forcibly 387 time, applications that rely on timely networking or anything to do
210 enter a debug session you have to issue a Sysrq sequence and then 388 with real wall clock time could be adversely affected, so you
211 type the letter <constant>g</constant>. Then you disconnect the 389 should take this into consideration when using the kernel
212 terminal session and connect gdb. Your options if you don't like 390 debugger.</para>
213 this are to hack gdb to send the sysrq-g for you as well as on the 391 </listitem>
214 initial connect, or to use a debugger proxy that allows an 392 </orderedlist></para>
215 unmodified gdb to do the debugging. 393 </sect1>
394 <sect1 id="quickKDBkeyboard">
395 <title>Quick start for kdb using a keyboard connected console</title>
396 <para>This is a quick example of how to use kdb with a keyboard.</para>
397 <para><orderedlist>
398 <listitem><para>Boot kernel with arguments:
399 <itemizedlist>
400 <listitem><para><constant>kgdboc=kbd</constant></para></listitem>
401 </itemizedlist></para>
402 <para>OR</para>
403 <para>Configure kgdboc after the kernel booted:
404 <itemizedlist>
405 <listitem><para><constant>echo kbd &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem>
406 </itemizedlist>
216 </para> 407 </para>
217 </sect2> 408 </listitem>
409 <listitem><para>Enter the kernel debugger manually or by waiting for an oops or fault. There are several ways you can enter the kernel debugger manually; all involve using the sysrq-g, which means you must have enabled CONFIG_MAGIC_SYSRQ=y in your kernel config.</para>
410 <itemizedlist>
411 <listitem><para>When logged in as root or with a super user session you can run:</para>
412 <para><constant>echo g &gt; /proc/sysrq-trigger</constant></para></listitem>
413 <listitem><para>Example using a laptop keyboard</para>
414 <para>Press and hold down: <constant>Alt</constant></para>
415 <para>Press and hold down: <constant>Fn</constant></para>
416 <para>Press and release the key with the label: <constant>SysRq</constant></para>
417 <para>Release: <constant>Fn</constant></para>
418 <para>Press and release: <constant>g</constant></para>
419 <para>Release: <constant>Alt</constant></para>
420 </listitem>
421 <listitem><para>Example using a PS/2 101-key keyboard</para>
422 <para>Press and hold down: <constant>Alt</constant></para>
423 <para>Press and release the key with the label: <constant>SysRq</constant></para>
424 <para>Press and release: <constant>g</constant></para>
425 <para>Release: <constant>Alt</constant></para>
426 </listitem>
427 </itemizedlist>
428 </listitem>
429 <listitem>
430 <para>Now type in a kdb command such as "help", "dmesg", "bt" or "go" to continue kernel execution.</para>
431 </listitem>
432 </orderedlist></para>
218 </sect1> 433 </sect1>
219 <sect1 id="kgdbcon"> 434 </chapter>
220 <title>Kernel parameter: kgdbcon</title> 435 <chapter id="EnableKGDB">
221 <para> 436 <title>Using kgdb / gdb</title>
222 Kgdb supports using the gdb serial protocol to send console messages 437 <para>In order to use kgdb you must activate it by passing
223 to the debugger when the debugger is connected and running. There 438 configuration information to one of the kgdb I/O drivers. If you
224 are two ways to activate this feature. 439 do not pass any configuration information kgdb will not do anything
440 at all. Kgdb will only actively hook up to the kernel trap hooks
441 if a kgdb I/O driver is loaded and configured. If you unconfigure
442 a kgdb I/O driver, kgdb will unregister all the kernel hook points.
443 </para>
444 <para> All kgdb I/O drivers can be reconfigured at run time, if
445 <symbol>CONFIG_SYSFS</symbol> and <symbol>CONFIG_MODULES</symbol>
446 are enabled, by echo'ing a new config string to
447 <constant>/sys/module/&lt;driver&gt;/parameter/&lt;option&gt;</constant>.
448 The driver can be unconfigured by passing an empty string. You cannot
449 change the configuration while the debugger is attached. Make sure
450 to detach the debugger with the <constant>detach</constant> command
451 prior to trying to unconfigure a kgdb I/O driver.
452 </para>
453 <sect1 id="ConnectingGDB">
454 <title>Connecting with gdb to a serial port</title>
225 <orderedlist> 455 <orderedlist>
226 <listitem><para>Activate with the kernel command line option:</para> 456 <listitem><para>Configure kgdboc</para>
227 <para><constant>kgdbcon</constant></para> 457 <para>Boot kernel with arguments:
458 <itemizedlist>
459 <listitem><para><constant>kgdboc=ttyS0,115200</constant></para></listitem>
460 </itemizedlist></para>
461 <para>OR</para>
462 <para>Configure kgdboc after the kernel booted:
463 <itemizedlist>
464 <listitem><para><constant>echo ttyS0 &gt; /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem>
465 </itemizedlist></para>
228 </listitem> 466 </listitem>
229 <listitem><para>Use sysfs before configuring an io driver</para> 467 <listitem>
230 <para> 468 <para>Stop kernel execution (break into the debugger)</para>
231 <constant>echo 1 &gt; /sys/module/kgdb/parameters/kgdb_use_con</constant> 469 <para>In order to connect to gdb via kgdboc, the kernel must
232 </para> 470 first be stopped. There are several ways to stop the kernel which
233 <para> 471 include using kgdbwait as a boot argument, via a sysrq-g, or running
234 NOTE: If you do this after you configure the kgdb I/O driver, the 472 the kernel until it takes an exception where it waits for the
235 setting will not take effect until the next point the I/O is 473 debugger to attach.
236 reconfigured. 474 <itemizedlist>
237 </para> 475 <listitem><para>When logged in as root or with a super user session you can run:</para>
476 <para><constant>echo g &gt; /proc/sysrq-trigger</constant></para></listitem>
477 <listitem><para>Example using minicom 2.2</para>
478 <para>Press: <constant>Control-a</constant></para>
479 <para>Press: <constant>f</constant></para>
480 <para>Press: <constant>g</constant></para>
238 </listitem> 481 </listitem>
239 </orderedlist> 482 <listitem><para>When you have telneted to a terminal server that supports sending a remote break</para>
240 </para> 483 <para>Press: <constant>Control-]</constant></para>
241 <para> 484 <para>Type in:<constant>send break</constant></para>
242 IMPORTANT NOTE: Using this option with kgdb over the console 485 <para>Press: <constant>Enter</constant></para>
243 (kgdboc) is not supported. 486 <para>Press: <constant>g</constant></para>
487 </listitem>
488 </itemizedlist>
244 </para> 489 </para>
245 </sect1> 490 </listitem>
246 </chapter> 491 <listitem>
247 <chapter id="ConnectingGDB"> 492 <para>Connect from from gdb</para>
248 <title>Connecting gdb</title>
249 <para>
250 If you are using kgdboc, you need to have used kgdbwait as a boot
251 argument, issued a sysrq-g, or the system you are going to debug
252 has already taken an exception and is waiting for the debugger to
253 attach before you can connect gdb.
254 </para>
255 <para>
256 If you are not using different kgdb I/O driver other than kgdboc,
257 you should be able to connect and the target will automatically
258 respond.
259 </para>
260 <para> 493 <para>
261 Example (using a serial port): 494 Example (using a directly connected port):
262 </para> 495 </para>
263 <programlisting> 496 <programlisting>
264 % gdb ./vmlinux 497 % gdb ./vmlinux
@@ -266,7 +499,7 @@
266 (gdb) target remote /dev/ttyS0 499 (gdb) target remote /dev/ttyS0
267 </programlisting> 500 </programlisting>
268 <para> 501 <para>
269 Example (kgdb to a terminal server on tcp port 2012): 502 Example (kgdb to a terminal server on TCP port 2012):
270 </para> 503 </para>
271 <programlisting> 504 <programlisting>
272 % gdb ./vmlinux 505 % gdb ./vmlinux
@@ -283,6 +516,83 @@
283 communications. You do this prior to issuing the <constant>target 516 communications. You do this prior to issuing the <constant>target
284 remote</constant> command by typing in: <constant>set debug remote 1</constant> 517 remote</constant> command by typing in: <constant>set debug remote 1</constant>
285 </para> 518 </para>
519 </listitem>
520 </orderedlist>
521 <para>Remember if you continue in gdb, and need to "break in" again,
522 you need to issue an other sysrq-g. It is easy to create a simple
523 entry point by putting a breakpoint at <constant>sys_sync</constant>
524 and then you can run "sync" from a shell or script to break into the
525 debugger.</para>
526 </sect1>
527 </chapter>
528 <chapter id="switchKdbKgdb">
529 <title>kgdb and kdb interoperability</title>
530 <para>It is possible to transition between kdb and kgdb dynamically.
531 The debug core will remember which you used the last time and
532 automatically start in the same mode.</para>
533 <sect1>
534 <title>Switching between kdb and kgdb</title>
535 <sect2>
536 <title>Switching from kgdb to kdb</title>
537 <para>
538 There are two ways to switch from kgdb to kdb: you can use gdb to
539 issue a maintenance packet, or you can blindly type the command $3#33.
540 Whenever kernel debugger stops in kgdb mode it will print the
541 message <constant>KGDB or $3#33 for KDB</constant>. It is important
542 to note that you have to type the sequence correctly in one pass.
543 You cannot type a backspace or delete because kgdb will interpret
544 that as part of the debug stream.
545 <orderedlist>
546 <listitem><para>Change from kgdb to kdb by blindly typing:</para>
547 <para><constant>$3#33</constant></para></listitem>
548 <listitem><para>Change from kgdb to kdb with gdb</para>
549 <para><constant>maintenance packet 3</constant></para>
550 <para>NOTE: Now you must kill gdb. Typically you press control-z and
551 issue the command: kill -9 %</para></listitem>
552 </orderedlist>
553 </para>
554 </sect2>
555 <sect2>
556 <title>Change from kdb to kgdb</title>
557 <para>There are two ways you can change from kdb to kgdb. You can
558 manually enter kgdb mode by issuing the kgdb command from the kdb
559 shell prompt, or you can connect gdb while the kdb shell prompt is
560 active. The kdb shell looks for the typical first commands that gdb
561 would issue with the gdb remote protocol and if it sees one of those
562 commands it automatically changes into kgdb mode.</para>
563 <orderedlist>
564 <listitem><para>From kdb issue the command:</para>
565 <para><constant>kgdb</constant></para>
566 <para>Now disconnect your terminal program and connect gdb in its place</para></listitem>
567 <listitem><para>At the kdb prompt, disconnect the terminal program and connect gdb in its place.</para></listitem>
568 </orderedlist>
569 </sect2>
570 </sect1>
571 <sect1>
572 <title>Running kdb commands from gdb</title>
573 <para>It is possible to run a limited set of kdb commands from gdb,
574 using the gdb monitor command. You don't want to execute any of the
575 run control or breakpoint operations, because it can disrupt the
576 state of the kernel debugger. You should be using gdb for
577 breakpoints and run control operations if you have gdb connected.
578 The more useful commands to run are things like lsmod, dmesg, ps or
579 possibly some of the memory information commands. To see all the kdb
580 commands you can run <constant>monitor help</constant>.</para>
581 <para>Example:
582 <informalexample><programlisting>
583(gdb) monitor ps
5841 idle process (state I) and
58527 sleeping system daemon (state M) processes suppressed,
586use 'ps A' to see all.
587Task Addr Pid Parent [*] cpu State Thread Command
588
5890xc78291d0 1 0 0 0 S 0xc7829404 init
5900xc7954150 942 1 0 0 S 0xc7954384 dropbear
5910xc78789c0 944 1 0 0 S 0xc7878bf4 sh
592(gdb)
593 </programlisting></informalexample>
594 </para>
595 </sect1>
286 </chapter> 596 </chapter>
287 <chapter id="KGDBTestSuite"> 597 <chapter id="KGDBTestSuite">
288 <title>kgdb Test Suite</title> 598 <title>kgdb Test Suite</title>
@@ -309,34 +619,36 @@
309 </para> 619 </para>
310 </chapter> 620 </chapter>
311 <chapter id="CommonBackEndReq"> 621 <chapter id="CommonBackEndReq">
312 <title>KGDB Internals</title> 622 <title>Kernel Debugger Internals</title>
313 <sect1 id="kgdbArchitecture"> 623 <sect1 id="kgdbArchitecture">
314 <title>Architecture Specifics</title> 624 <title>Architecture Specifics</title>
315 <para> 625 <para>
316 Kgdb is organized into three basic components: 626 The kernel debugger is organized into a number of components:
317 <orderedlist> 627 <orderedlist>
318 <listitem><para>kgdb core</para> 628 <listitem><para>The debug core</para>
319 <para> 629 <para>
320 The kgdb core is found in kernel/kgdb.c. It contains: 630 The debug core is found in kernel/debugger/debug_core.c. It contains:
321 <itemizedlist> 631 <itemizedlist>
322 <listitem><para>All the logic to implement the gdb serial protocol</para></listitem> 632 <listitem><para>A generic OS exception handler which includes
323 <listitem><para>A generic OS exception handler which includes sync'ing the processors into a stopped state on an multi cpu system.</para></listitem> 633 sync'ing the processors into a stopped state on an multi-CPU
634 system.</para></listitem>
324 <listitem><para>The API to talk to the kgdb I/O drivers</para></listitem> 635 <listitem><para>The API to talk to the kgdb I/O drivers</para></listitem>
325 <listitem><para>The API to make calls to the arch specific kgdb implementation</para></listitem> 636 <listitem><para>The API to make calls to the arch-specific kgdb implementation</para></listitem>
326 <listitem><para>The logic to perform safe memory reads and writes to memory while using the debugger</para></listitem> 637 <listitem><para>The logic to perform safe memory reads and writes to memory while using the debugger</para></listitem>
327 <listitem><para>A full implementation for software breakpoints unless overridden by the arch</para></listitem> 638 <listitem><para>A full implementation for software breakpoints unless overridden by the arch</para></listitem>
639 <listitem><para>The API to invoke either the kdb or kgdb frontend to the debug core.</para></listitem>
328 </itemizedlist> 640 </itemizedlist>
329 </para> 641 </para>
330 </listitem> 642 </listitem>
331 <listitem><para>kgdb arch specific implementation</para> 643 <listitem><para>kgdb arch-specific implementation</para>
332 <para> 644 <para>
333 This implementation is generally found in arch/*/kernel/kgdb.c. 645 This implementation is generally found in arch/*/kernel/kgdb.c.
334 As an example, arch/x86/kernel/kgdb.c contains the specifics to 646 As an example, arch/x86/kernel/kgdb.c contains the specifics to
335 implement HW breakpoint as well as the initialization to 647 implement HW breakpoint as well as the initialization to
336 dynamically register and unregister for the trap handlers on 648 dynamically register and unregister for the trap handlers on
337 this architecture. The arch specific portion implements: 649 this architecture. The arch-specific portion implements:
338 <itemizedlist> 650 <itemizedlist>
339 <listitem><para>contains an arch specific trap catcher which 651 <listitem><para>contains an arch-specific trap catcher which
340 invokes kgdb_handle_exception() to start kgdb about doing its 652 invokes kgdb_handle_exception() to start kgdb about doing its
341 work</para></listitem> 653 work</para></listitem>
342 <listitem><para>translation to and from gdb specific packet format to pt_regs</para></listitem> 654 <listitem><para>translation to and from gdb specific packet format to pt_regs</para></listitem>
@@ -347,11 +659,35 @@
347 </itemizedlist> 659 </itemizedlist>
348 </para> 660 </para>
349 </listitem> 661 </listitem>
662 <listitem><para>gdbstub frontend (aka kgdb)</para>
663 <para>The gdbstub is located in kernel/debug/gdbstub.c. It contains:</para>
664 <itemizedlist>
665 <listitem><para>All the logic to implement the gdb serial protocol</para></listitem>
666 </itemizedlist>
667 </listitem>
668 <listitem><para>kdb frontend</para>
669 <para>The kdb debugger shell is broken down into a number of
670 components. The kdb core is located in kernel/debug/kdb. There
671 are a number of helper functions in some of the other kernel
672 components to make it possible for kdb to examine and report
673 information about the kernel without taking locks that could
674 cause a kernel deadlock. The kdb core contains implements the following functionality.</para>
675 <itemizedlist>
676 <listitem><para>A simple shell</para></listitem>
677 <listitem><para>The kdb core command set</para></listitem>
678 <listitem><para>A registration API to register additional kdb shell commands.</para>
679 <para>A good example of a self-contained kdb module is the "ftdump" command for dumping the ftrace buffer. See: kernel/trace/trace_kdb.c</para></listitem>
680 <listitem><para>The implementation for kdb_printf() which
681 emits messages directly to I/O drivers, bypassing the kernel
682 log.</para></listitem>
683 <listitem><para>SW / HW breakpoint management for the kdb shell</para></listitem>
684 </itemizedlist>
685 </listitem>
350 <listitem><para>kgdb I/O driver</para> 686 <listitem><para>kgdb I/O driver</para>
351 <para> 687 <para>
352 Each kgdb I/O driver has to provide an implemenation for the following: 688 Each kgdb I/O driver has to provide an implementation for the following:
353 <itemizedlist> 689 <itemizedlist>
354 <listitem><para>configuration via builtin or module</para></listitem> 690 <listitem><para>configuration via built-in or module</para></listitem>
355 <listitem><para>dynamic configuration and kgdb hook registration calls</para></listitem> 691 <listitem><para>dynamic configuration and kgdb hook registration calls</para></listitem>
356 <listitem><para>read and write character interface</para></listitem> 692 <listitem><para>read and write character interface</para></listitem>
357 <listitem><para>A cleanup handler for unconfiguring from the kgdb core</para></listitem> 693 <listitem><para>A cleanup handler for unconfiguring from the kgdb core</para></listitem>
@@ -416,15 +752,15 @@
416 underlying low level to the hardware driver having "polling hooks" 752 underlying low level to the hardware driver having "polling hooks"
417 which the to which the tty driver is attached. In the initial 753 which the to which the tty driver is attached. In the initial
418 implementation of kgdboc it the serial_core was changed to expose a 754 implementation of kgdboc it the serial_core was changed to expose a
419 low level uart hook for doing polled mode reading and writing of a 755 low level UART hook for doing polled mode reading and writing of a
420 single character while in an atomic context. When kgdb makes an I/O 756 single character while in an atomic context. When kgdb makes an I/O
421 request to the debugger, kgdboc invokes a call back in the serial 757 request to the debugger, kgdboc invokes a call back in the serial
422 core which in turn uses the call back in the uart driver. It is 758 core which in turn uses the call back in the UART driver. It is
423 certainly possible to extend kgdboc to work with non-uart based 759 certainly possible to extend kgdboc to work with non-UART based
424 consoles in the future. 760 consoles in the future.
425 </para> 761 </para>
426 <para> 762 <para>
427 When using kgdboc with a uart, the uart driver must implement two callbacks in the <constant>struct uart_ops</constant>. Example from drivers/8250.c:<programlisting> 763 When using kgdboc with a UART, the UART driver must implement two callbacks in the <constant>struct uart_ops</constant>. Example from drivers/8250.c:<programlisting>
428#ifdef CONFIG_CONSOLE_POLL 764#ifdef CONFIG_CONSOLE_POLL
429 .poll_get_char = serial8250_get_poll_char, 765 .poll_get_char = serial8250_get_poll_char,
430 .poll_put_char = serial8250_put_poll_char, 766 .poll_put_char = serial8250_put_poll_char,
@@ -434,7 +770,7 @@
434 <constant>#ifdef CONFIG_CONSOLE_POLL</constant>, as shown above. 770 <constant>#ifdef CONFIG_CONSOLE_POLL</constant>, as shown above.
435 Keep in mind that polling hooks have to be implemented in such a way 771 Keep in mind that polling hooks have to be implemented in such a way
436 that they can be called from an atomic context and have to restore 772 that they can be called from an atomic context and have to restore
437 the state of the uart chip on return such that the system can return 773 the state of the UART chip on return such that the system can return
438 to normal when the debugger detaches. You need to be very careful 774 to normal when the debugger detaches. You need to be very careful
439 with any kind of lock you consider, because failing here is most 775 with any kind of lock you consider, because failing here is most
440 going to mean pressing the reset button. 776 going to mean pressing the reset button.
@@ -453,6 +789,10 @@
453 <itemizedlist> 789 <itemizedlist>
454 <listitem><para>Jason Wessel<email>jason.wessel@windriver.com</email></para></listitem> 790 <listitem><para>Jason Wessel<email>jason.wessel@windriver.com</email></para></listitem>
455 </itemizedlist> 791 </itemizedlist>
792 In Jan 2010 this document was updated to include kdb.
793 <itemizedlist>
794 <listitem><para>Jason Wessel<email>jason.wessel@windriver.com</email></para></listitem>
795 </itemizedlist>
456 </para> 796 </para>
457 </chapter> 797 </chapter>
458</book> 798</book>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index b12bacd252fc..bdce359820bb 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -58,6 +58,7 @@ parameter is applicable:
58 ISAPNP ISA PnP code is enabled. 58 ISAPNP ISA PnP code is enabled.
59 ISDN Appropriate ISDN support is enabled. 59 ISDN Appropriate ISDN support is enabled.
60 JOY Appropriate joystick support is enabled. 60 JOY Appropriate joystick support is enabled.
61 KGDB Kernel debugger support is enabled.
61 KVM Kernel Virtual Machine support is enabled. 62 KVM Kernel Virtual Machine support is enabled.
62 LIBATA Libata driver is enabled 63 LIBATA Libata driver is enabled
63 LP Printer support is enabled. 64 LP Printer support is enabled.
@@ -1120,10 +1121,15 @@ and is between 256 and 4096 characters. It is defined in the file
1120 use the HighMem zone if it exists, and the Normal 1121 use the HighMem zone if it exists, and the Normal
1121 zone if it does not. 1122 zone if it does not.
1122 1123
1123 kgdboc= [HW] kgdb over consoles. 1124 kgdboc= [KGDB,HW] kgdb over consoles.
1124 Requires a tty driver that supports console polling. 1125 Requires a tty driver that supports console polling,
1125 (only serial supported for now) 1126 or a supported polling keyboard driver (non-usb).
1126 Format: <serial_device>[,baud] 1127 Serial only format: <serial_device>[,baud]
1128 keyboard only format: kbd
1129 keyboard and serial format: kbd,<serial_device>[,baud]
1130
1131 kgdbwait [KGDB] Stop kernel execution and enter the
1132 kernel debugger at the earliest opportunity.
1127 1133
1128 kmac= [MIPS] korina ethernet MAC address. 1134 kmac= [MIPS] korina ethernet MAC address.
1129 Configure the RouterBoard 532 series on-chip 1135 Configure the RouterBoard 532 series on-chip
diff --git a/MAINTAINERS b/MAINTAINERS
index a31a717e6dcc..a8fe9b461e09 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3319,15 +3319,17 @@ F: include/linux/key-type.h
3319F: include/keys/ 3319F: include/keys/
3320F: security/keys/ 3320F: security/keys/
3321 3321
3322KGDB 3322KGDB / KDB /debug_core
3323M: Jason Wessel <jason.wessel@windriver.com> 3323M: Jason Wessel <jason.wessel@windriver.com>
3324W: http://kgdb.wiki.kernel.org/
3324L: kgdb-bugreport@lists.sourceforge.net 3325L: kgdb-bugreport@lists.sourceforge.net
3325S: Maintained 3326S: Maintained
3326F: Documentation/DocBook/kgdb.tmpl 3327F: Documentation/DocBook/kgdb.tmpl
3327F: drivers/misc/kgdbts.c 3328F: drivers/misc/kgdbts.c
3328F: drivers/serial/kgdboc.c 3329F: drivers/serial/kgdboc.c
3330F: include/linux/kdb.h
3329F: include/linux/kgdb.h 3331F: include/linux/kgdb.h
3330F: kernel/kgdb.c 3332F: kernel/debug/
3331 3333
3332KMEMCHECK 3334KMEMCHECK
3333M: Vegard Nossum <vegardno@ifi.uio.no> 3335M: Vegard Nossum <vegardno@ifi.uio.no>
diff --git a/arch/arm/include/asm/kmap_types.h b/arch/arm/include/asm/kmap_types.h
index c4b2ea3fbe42..e51b1e81df05 100644
--- a/arch/arm/include/asm/kmap_types.h
+++ b/arch/arm/include/asm/kmap_types.h
@@ -20,6 +20,7 @@ enum km_type {
20 KM_SOFTIRQ1, 20 KM_SOFTIRQ1,
21 KM_L1_CACHE, 21 KM_L1_CACHE,
22 KM_L2_CACHE, 22 KM_L2_CACHE,
23 KM_KDB,
23 KM_TYPE_NR 24 KM_TYPE_NR
24}; 25};
25 26
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c
index a5b846b9895d..c868a8864117 100644
--- a/arch/arm/kernel/kgdb.c
+++ b/arch/arm/kernel/kgdb.c
@@ -98,6 +98,11 @@ sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
98 gdb_regs[_CPSR] = thread_regs->ARM_cpsr; 98 gdb_regs[_CPSR] = thread_regs->ARM_cpsr;
99} 99}
100 100
101void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
102{
103 regs->ARM_pc = pc;
104}
105
101static int compiled_break; 106static int compiled_break;
102 107
103int kgdb_arch_handle_exception(int exception_vector, int signo, 108int kgdb_arch_handle_exception(int exception_vector, int signo,
diff --git a/arch/blackfin/kernel/kgdb.c b/arch/blackfin/kernel/kgdb.c
index 2c501ceb1e55..7367aea4ae59 100644
--- a/arch/blackfin/kernel/kgdb.c
+++ b/arch/blackfin/kernel/kgdb.c
@@ -439,6 +439,11 @@ int kgdb_validate_break_address(unsigned long addr)
439 return -EFAULT; 439 return -EFAULT;
440} 440}
441 441
442void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
443{
444 regs->retx = ip;
445}
446
442int kgdb_arch_init(void) 447int kgdb_arch_init(void)
443{ 448{
444 kgdb_single_step = 0; 449 kgdb_single_step = 0;
diff --git a/arch/mips/include/asm/kgdb.h b/arch/mips/include/asm/kgdb.h
index 48223b09396c..19002d605ac4 100644
--- a/arch/mips/include/asm/kgdb.h
+++ b/arch/mips/include/asm/kgdb.h
@@ -38,6 +38,8 @@ extern int kgdb_early_setup;
38extern void *saved_vectors[32]; 38extern void *saved_vectors[32];
39extern void handle_exception(struct pt_regs *regs); 39extern void handle_exception(struct pt_regs *regs);
40extern void breakinst(void); 40extern void breakinst(void);
41extern int kgdb_ll_trap(int cmd, const char *str,
42 struct pt_regs *regs, long err, int trap, int sig);
41 43
42#endif /* __KERNEL__ */ 44#endif /* __KERNEL__ */
43 45
diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c
index 50c9bb880667..9b78ff6e9b84 100644
--- a/arch/mips/kernel/kgdb.c
+++ b/arch/mips/kernel/kgdb.c
@@ -180,6 +180,11 @@ void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
180 *(ptr++) = regs->cp0_epc; 180 *(ptr++) = regs->cp0_epc;
181} 181}
182 182
183void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
184{
185 regs->cp0_epc = pc;
186}
187
183/* 188/*
184 * Calls linux_debug_hook before the kernel dies. If KGDB is enabled, 189 * Calls linux_debug_hook before the kernel dies. If KGDB is enabled,
185 * then try to fall into the debugger 190 * then try to fall into the debugger
@@ -198,7 +203,7 @@ static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd,
198 if (atomic_read(&kgdb_active) != -1) 203 if (atomic_read(&kgdb_active) != -1)
199 kgdb_nmicallback(smp_processor_id(), regs); 204 kgdb_nmicallback(smp_processor_id(), regs);
200 205
201 if (kgdb_handle_exception(trap, compute_signal(trap), 0, regs)) 206 if (kgdb_handle_exception(trap, compute_signal(trap), cmd, regs))
202 return NOTIFY_DONE; 207 return NOTIFY_DONE;
203 208
204 if (atomic_read(&kgdb_setting_breakpoint)) 209 if (atomic_read(&kgdb_setting_breakpoint))
@@ -212,6 +217,26 @@ static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd,
212 return NOTIFY_STOP; 217 return NOTIFY_STOP;
213} 218}
214 219
220#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
221int kgdb_ll_trap(int cmd, const char *str,
222 struct pt_regs *regs, long err, int trap, int sig)
223{
224 struct die_args args = {
225 .regs = regs,
226 .str = str,
227 .err = err,
228 .trapnr = trap,
229 .signr = sig,
230
231 };
232
233 if (!kgdb_io_module_registered)
234 return NOTIFY_DONE;
235
236 return kgdb_mips_notify(NULL, cmd, &args);
237}
238#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
239
215static struct notifier_block kgdb_notifier = { 240static struct notifier_block kgdb_notifier = {
216 .notifier_call = kgdb_mips_notify, 241 .notifier_call = kgdb_mips_notify,
217}; 242};
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index d612c6dcb746..950bde8813fc 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -26,6 +26,7 @@
26#include <linux/kgdb.h> 26#include <linux/kgdb.h>
27#include <linux/kdebug.h> 27#include <linux/kdebug.h>
28#include <linux/notifier.h> 28#include <linux/notifier.h>
29#include <linux/kdb.h>
29 30
30#include <asm/bootinfo.h> 31#include <asm/bootinfo.h>
31#include <asm/branch.h> 32#include <asm/branch.h>
@@ -185,6 +186,11 @@ void show_stack(struct task_struct *task, unsigned long *sp)
185 regs.regs[29] = task->thread.reg29; 186 regs.regs[29] = task->thread.reg29;
186 regs.regs[31] = 0; 187 regs.regs[31] = 0;
187 regs.cp0_epc = task->thread.reg31; 188 regs.cp0_epc = task->thread.reg31;
189#ifdef CONFIG_KGDB_KDB
190 } else if (atomic_read(&kgdb_active) != -1 &&
191 kdb_current_regs) {
192 memcpy(&regs, kdb_current_regs, sizeof(regs));
193#endif /* CONFIG_KGDB_KDB */
188 } else { 194 } else {
189 prepare_frametrace(&regs); 195 prepare_frametrace(&regs);
190 } 196 }
@@ -360,6 +366,8 @@ void __noreturn die(const char * str, struct pt_regs * regs)
360 unsigned long dvpret = dvpe(); 366 unsigned long dvpret = dvpe();
361#endif /* CONFIG_MIPS_MT_SMTC */ 367#endif /* CONFIG_MIPS_MT_SMTC */
362 368
369 notify_die(DIE_OOPS, str, (struct pt_regs *)regs, SIGSEGV, 0, 0);
370
363 console_verbose(); 371 console_verbose();
364 spin_lock_irq(&die_lock); 372 spin_lock_irq(&die_lock);
365 bust_spinlocks(1); 373 bust_spinlocks(1);
@@ -704,6 +712,11 @@ static void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
704 siginfo_t info; 712 siginfo_t info;
705 char b[40]; 713 char b[40];
706 714
715#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
716 if (kgdb_ll_trap(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP)
717 return;
718#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
719
707 if (notify_die(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP) 720 if (notify_die(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP)
708 return; 721 return;
709 722
diff --git a/arch/powerpc/include/asm/kmap_types.h b/arch/powerpc/include/asm/kmap_types.h
index 916369575c97..bca8fdcd2542 100644
--- a/arch/powerpc/include/asm/kmap_types.h
+++ b/arch/powerpc/include/asm/kmap_types.h
@@ -26,6 +26,7 @@ enum km_type {
26 KM_SOFTIRQ1, 26 KM_SOFTIRQ1,
27 KM_PPC_SYNC_PAGE, 27 KM_PPC_SYNC_PAGE,
28 KM_PPC_SYNC_ICACHE, 28 KM_PPC_SYNC_ICACHE,
29 KM_KDB,
29 KM_TYPE_NR 30 KM_TYPE_NR
30}; 31};
31 32
diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index 41bada0298c8..82a7b228c81a 100644
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c
@@ -20,6 +20,7 @@
20#include <linux/smp.h> 20#include <linux/smp.h>
21#include <linux/signal.h> 21#include <linux/signal.h>
22#include <linux/ptrace.h> 22#include <linux/ptrace.h>
23#include <linux/kdebug.h>
23#include <asm/current.h> 24#include <asm/current.h>
24#include <asm/processor.h> 25#include <asm/processor.h>
25#include <asm/machdep.h> 26#include <asm/machdep.h>
@@ -115,7 +116,8 @@ void kgdb_roundup_cpus(unsigned long flags)
115/* KGDB functions to use existing PowerPC64 hooks. */ 116/* KGDB functions to use existing PowerPC64 hooks. */
116static int kgdb_debugger(struct pt_regs *regs) 117static int kgdb_debugger(struct pt_regs *regs)
117{ 118{
118 return kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs); 119 return !kgdb_handle_exception(1, computeSignal(TRAP(regs)),
120 DIE_OOPS, regs);
119} 121}
120 122
121static int kgdb_handle_breakpoint(struct pt_regs *regs) 123static int kgdb_handle_breakpoint(struct pt_regs *regs)
@@ -123,7 +125,7 @@ static int kgdb_handle_breakpoint(struct pt_regs *regs)
123 if (user_mode(regs)) 125 if (user_mode(regs))
124 return 0; 126 return 0;
125 127
126 if (kgdb_handle_exception(0, SIGTRAP, 0, regs) != 0) 128 if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
127 return 0; 129 return 0;
128 130
129 if (*(u32 *) (regs->nip) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr)) 131 if (*(u32 *) (regs->nip) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr))
@@ -309,6 +311,11 @@ void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
309 (unsigned long)(((void *)gdb_regs) + NUMREGBYTES)); 311 (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
310} 312}
311 313
314void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
315{
316 regs->nip = pc;
317}
318
312/* 319/*
313 * This function does PowerPC specific procesing for interfacing to gdb. 320 * This function does PowerPC specific procesing for interfacing to gdb.
314 */ 321 */
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 29d128eb6c43..b6859aade9c2 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -815,12 +815,15 @@ void __kprobes program_check_exception(struct pt_regs *regs)
815 return; 815 return;
816 } 816 }
817 if (reason & REASON_TRAP) { 817 if (reason & REASON_TRAP) {
818 /* Debugger is first in line to stop recursive faults in
819 * rcu_lock, notify_die, or atomic_notifier_call_chain */
820 if (debugger_bpt(regs))
821 return;
822
818 /* trap exception */ 823 /* trap exception */
819 if (notify_die(DIE_BPT, "breakpoint", regs, 5, 5, SIGTRAP) 824 if (notify_die(DIE_BPT, "breakpoint", regs, 5, 5, SIGTRAP)
820 == NOTIFY_STOP) 825 == NOTIFY_STOP)
821 return; 826 return;
822 if (debugger_bpt(regs))
823 return;
824 827
825 if (!(regs->msr & MSR_PR) && /* not user-mode */ 828 if (!(regs->msr & MSR_PR) && /* not user-mode */
826 report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) { 829 report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) {
diff --git a/arch/sh/kernel/kgdb.c b/arch/sh/kernel/kgdb.c
index 70c69659b846..efb6d398dec3 100644
--- a/arch/sh/kernel/kgdb.c
+++ b/arch/sh/kernel/kgdb.c
@@ -237,6 +237,18 @@ int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
237 return -1; 237 return -1;
238} 238}
239 239
240unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs)
241{
242 if (exception == 60)
243 return instruction_pointer(regs) - 2;
244 return instruction_pointer(regs);
245}
246
247void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
248{
249 regs->pc = ip;
250}
251
240/* 252/*
241 * The primary entry points for the kgdb debug trap table entries. 253 * The primary entry points for the kgdb debug trap table entries.
242 */ 254 */
@@ -247,7 +259,7 @@ BUILD_TRAP_HANDLER(singlestep)
247 259
248 local_irq_save(flags); 260 local_irq_save(flags);
249 regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); 261 regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
250 kgdb_handle_exception(vec >> 2, SIGTRAP, 0, regs); 262 kgdb_handle_exception(0, SIGTRAP, 0, regs);
251 local_irq_restore(flags); 263 local_irq_restore(flags);
252} 264}
253 265
diff --git a/arch/sparc/kernel/kgdb_32.c b/arch/sparc/kernel/kgdb_32.c
index 04df4edc0073..539243b236fa 100644
--- a/arch/sparc/kernel/kgdb_32.c
+++ b/arch/sparc/kernel/kgdb_32.c
@@ -158,6 +158,12 @@ void kgdb_arch_exit(void)
158{ 158{
159} 159}
160 160
161void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
162{
163 regs->pc = ip;
164 regs->npc = regs->pc + 4;
165}
166
161struct kgdb_arch arch_kgdb_ops = { 167struct kgdb_arch arch_kgdb_ops = {
162 /* Breakpoint instruction: ta 0x7d */ 168 /* Breakpoint instruction: ta 0x7d */
163 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d }, 169 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d },
diff --git a/arch/sparc/kernel/kgdb_64.c b/arch/sparc/kernel/kgdb_64.c
index 0a2bd0f99fc1..768290a6c028 100644
--- a/arch/sparc/kernel/kgdb_64.c
+++ b/arch/sparc/kernel/kgdb_64.c
@@ -181,6 +181,12 @@ void kgdb_arch_exit(void)
181{ 181{
182} 182}
183 183
184void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
185{
186 regs->tpc = ip;
187 regs->tnpc = regs->tpc + 4;
188}
189
184struct kgdb_arch arch_kgdb_ops = { 190struct kgdb_arch arch_kgdb_ops = {
185 /* Breakpoint instruction: ta 0x72 */ 191 /* Breakpoint instruction: ta 0x72 */
186 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 }, 192 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 },
diff --git a/arch/x86/include/asm/kgdb.h b/arch/x86/include/asm/kgdb.h
index e6c6c808489f..006da3687cdc 100644
--- a/arch/x86/include/asm/kgdb.h
+++ b/arch/x86/include/asm/kgdb.h
@@ -76,4 +76,7 @@ static inline void arch_kgdb_breakpoint(void)
76#define BREAK_INSTR_SIZE 1 76#define BREAK_INSTR_SIZE 1
77#define CACHE_FLUSH_IS_SAFE 1 77#define CACHE_FLUSH_IS_SAFE 1
78 78
79extern int kgdb_ll_trap(int cmd, const char *str,
80 struct pt_regs *regs, long err, int trap, int sig);
81
79#endif /* _ASM_X86_KGDB_H */ 82#endif /* _ASM_X86_KGDB_H */
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index b2258ca91003..95b89d4cb8f1 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -47,20 +47,8 @@
47#include <asm/debugreg.h> 47#include <asm/debugreg.h>
48#include <asm/apicdef.h> 48#include <asm/apicdef.h>
49#include <asm/system.h> 49#include <asm/system.h>
50
51#include <asm/apic.h> 50#include <asm/apic.h>
52 51
53/*
54 * Put the error code here just in case the user cares:
55 */
56static int gdb_x86errcode;
57
58/*
59 * Likewise, the vector number here (since GDB only gets the signal
60 * number through the usual means, and that's not very specific):
61 */
62static int gdb_x86vector = -1;
63
64/** 52/**
65 * pt_regs_to_gdb_regs - Convert ptrace regs to GDB regs 53 * pt_regs_to_gdb_regs - Convert ptrace regs to GDB regs
66 * @gdb_regs: A pointer to hold the registers in the order GDB wants. 54 * @gdb_regs: A pointer to hold the registers in the order GDB wants.
@@ -399,23 +387,6 @@ void kgdb_disable_hw_debug(struct pt_regs *regs)
399 } 387 }
400} 388}
401 389
402/**
403 * kgdb_post_primary_code - Save error vector/code numbers.
404 * @regs: Original pt_regs.
405 * @e_vector: Original error vector.
406 * @err_code: Original error code.
407 *
408 * This is needed on architectures which support SMP and KGDB.
409 * This function is called after all the slave cpus have been put
410 * to a know spin state and the primary CPU has control over KGDB.
411 */
412void kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
413{
414 /* primary processor is completely in the debugger */
415 gdb_x86vector = e_vector;
416 gdb_x86errcode = err_code;
417}
418
419#ifdef CONFIG_SMP 390#ifdef CONFIG_SMP
420/** 391/**
421 * kgdb_roundup_cpus - Get other CPUs into a holding pattern 392 * kgdb_roundup_cpus - Get other CPUs into a holding pattern
@@ -567,7 +538,7 @@ static int __kgdb_notify(struct die_args *args, unsigned long cmd)
567 return NOTIFY_DONE; 538 return NOTIFY_DONE;
568 } 539 }
569 540
570 if (kgdb_handle_exception(args->trapnr, args->signr, args->err, regs)) 541 if (kgdb_handle_exception(args->trapnr, args->signr, cmd, regs))
571 return NOTIFY_DONE; 542 return NOTIFY_DONE;
572 543
573 /* Must touch watchdog before return to normal operation */ 544 /* Must touch watchdog before return to normal operation */
@@ -575,6 +546,26 @@ static int __kgdb_notify(struct die_args *args, unsigned long cmd)
575 return NOTIFY_STOP; 546 return NOTIFY_STOP;
576} 547}
577 548
549#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
550int kgdb_ll_trap(int cmd, const char *str,
551 struct pt_regs *regs, long err, int trap, int sig)
552{
553 struct die_args args = {
554 .regs = regs,
555 .str = str,
556 .err = err,
557 .trapnr = trap,
558 .signr = sig,
559
560 };
561
562 if (!kgdb_io_module_registered)
563 return NOTIFY_DONE;
564
565 return __kgdb_notify(&args, cmd);
566}
567#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
568
578static int 569static int
579kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr) 570kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr)
580{ 571{
@@ -690,6 +681,11 @@ unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs)
690 return instruction_pointer(regs); 681 return instruction_pointer(regs);
691} 682}
692 683
684void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
685{
686 regs->ip = ip;
687}
688
693struct kgdb_arch arch_kgdb_ops = { 689struct kgdb_arch arch_kgdb_ops = {
694 /* Breakpoint instruction: */ 690 /* Breakpoint instruction: */
695 .gdb_bpt_instr = { 0xcc }, 691 .gdb_bpt_instr = { 0xcc },
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 02cfb9b8f5b1..7eaad4c5110a 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -15,6 +15,7 @@
15#include <linux/kprobes.h> 15#include <linux/kprobes.h>
16#include <linux/uaccess.h> 16#include <linux/uaccess.h>
17#include <linux/kdebug.h> 17#include <linux/kdebug.h>
18#include <linux/kgdb.h>
18#include <linux/kernel.h> 19#include <linux/kernel.h>
19#include <linux/module.h> 20#include <linux/module.h>
20#include <linux/ptrace.h> 21#include <linux/ptrace.h>
@@ -451,6 +452,11 @@ void restart_nmi(void)
451/* May run on IST stack. */ 452/* May run on IST stack. */
452dotraplinkage void __kprobes do_int3(struct pt_regs *regs, long error_code) 453dotraplinkage void __kprobes do_int3(struct pt_regs *regs, long error_code)
453{ 454{
455#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
456 if (kgdb_ll_trap(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP)
457 == NOTIFY_STOP)
458 return;
459#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
454#ifdef CONFIG_KPROBES 460#ifdef CONFIG_KPROBES
455 if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) 461 if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP)
456 == NOTIFY_STOP) 462 == NOTIFY_STOP)
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 2b1ea3d4c4f4..891e1dd65f24 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -1891,8 +1891,8 @@ static int serial8250_get_poll_char(struct uart_port *port)
1891 struct uart_8250_port *up = (struct uart_8250_port *)port; 1891 struct uart_8250_port *up = (struct uart_8250_port *)port;
1892 unsigned char lsr = serial_inp(up, UART_LSR); 1892 unsigned char lsr = serial_inp(up, UART_LSR);
1893 1893
1894 while (!(lsr & UART_LSR_DR)) 1894 if (!(lsr & UART_LSR_DR))
1895 lsr = serial_inp(up, UART_LSR); 1895 return NO_POLL_CHAR;
1896 1896
1897 return serial_inp(up, UART_RX); 1897 return serial_inp(up, UART_RX);
1898} 1898}
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 743ebf5f16da..eb4cb480b93e 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -342,9 +342,9 @@ static int pl010_get_poll_char(struct uart_port *port)
342 struct uart_amba_port *uap = (struct uart_amba_port *)port; 342 struct uart_amba_port *uap = (struct uart_amba_port *)port;
343 unsigned int status; 343 unsigned int status;
344 344
345 do { 345 status = readw(uap->port.membase + UART01x_FR);
346 status = readw(uap->port.membase + UART01x_FR); 346 if (status & UART01x_FR_RXFE)
347 } while (status & UART01x_FR_RXFE); 347 return NO_POLL_CHAR;
348 348
349 return readw(uap->port.membase + UART01x_DR); 349 return readw(uap->port.membase + UART01x_DR);
350} 350}
diff --git a/drivers/serial/kgdboc.c b/drivers/serial/kgdboc.c
index eadc1ab6bbce..b765ab48dfe7 100644
--- a/drivers/serial/kgdboc.c
+++ b/drivers/serial/kgdboc.c
@@ -14,7 +14,9 @@
14#include <linux/kernel.h> 14#include <linux/kernel.h>
15#include <linux/ctype.h> 15#include <linux/ctype.h>
16#include <linux/kgdb.h> 16#include <linux/kgdb.h>
17#include <linux/kdb.h>
17#include <linux/tty.h> 18#include <linux/tty.h>
19#include <linux/console.h>
18 20
19#define MAX_CONFIG_LEN 40 21#define MAX_CONFIG_LEN 40
20 22
@@ -32,6 +34,40 @@ static struct kparam_string kps = {
32static struct tty_driver *kgdb_tty_driver; 34static struct tty_driver *kgdb_tty_driver;
33static int kgdb_tty_line; 35static int kgdb_tty_line;
34 36
37#ifdef CONFIG_KDB_KEYBOARD
38static int kgdboc_register_kbd(char **cptr)
39{
40 if (strncmp(*cptr, "kbd", 3) == 0) {
41 if (kdb_poll_idx < KDB_POLL_FUNC_MAX) {
42 kdb_poll_funcs[kdb_poll_idx] = kdb_get_kbd_char;
43 kdb_poll_idx++;
44 if (cptr[0][3] == ',')
45 *cptr += 4;
46 else
47 return 1;
48 }
49 }
50 return 0;
51}
52
53static void kgdboc_unregister_kbd(void)
54{
55 int i;
56
57 for (i = 0; i < kdb_poll_idx; i++) {
58 if (kdb_poll_funcs[i] == kdb_get_kbd_char) {
59 kdb_poll_idx--;
60 kdb_poll_funcs[i] = kdb_poll_funcs[kdb_poll_idx];
61 kdb_poll_funcs[kdb_poll_idx] = NULL;
62 i--;
63 }
64 }
65}
66#else /* ! CONFIG_KDB_KEYBOARD */
67#define kgdboc_register_kbd(x) 0
68#define kgdboc_unregister_kbd()
69#endif /* ! CONFIG_KDB_KEYBOARD */
70
35static int kgdboc_option_setup(char *opt) 71static int kgdboc_option_setup(char *opt)
36{ 72{
37 if (strlen(opt) > MAX_CONFIG_LEN) { 73 if (strlen(opt) > MAX_CONFIG_LEN) {
@@ -45,25 +81,51 @@ static int kgdboc_option_setup(char *opt)
45 81
46__setup("kgdboc=", kgdboc_option_setup); 82__setup("kgdboc=", kgdboc_option_setup);
47 83
84static void cleanup_kgdboc(void)
85{
86 kgdboc_unregister_kbd();
87 if (configured == 1)
88 kgdb_unregister_io_module(&kgdboc_io_ops);
89}
90
48static int configure_kgdboc(void) 91static int configure_kgdboc(void)
49{ 92{
50 struct tty_driver *p; 93 struct tty_driver *p;
51 int tty_line = 0; 94 int tty_line = 0;
52 int err; 95 int err;
96 char *cptr = config;
97 struct console *cons;
53 98
54 err = kgdboc_option_setup(config); 99 err = kgdboc_option_setup(config);
55 if (err || !strlen(config) || isspace(config[0])) 100 if (err || !strlen(config) || isspace(config[0]))
56 goto noconfig; 101 goto noconfig;
57 102
58 err = -ENODEV; 103 err = -ENODEV;
104 kgdboc_io_ops.is_console = 0;
105 kgdb_tty_driver = NULL;
59 106
60 p = tty_find_polling_driver(config, &tty_line); 107 if (kgdboc_register_kbd(&cptr))
108 goto do_register;
109
110 p = tty_find_polling_driver(cptr, &tty_line);
61 if (!p) 111 if (!p)
62 goto noconfig; 112 goto noconfig;
63 113
114 cons = console_drivers;
115 while (cons) {
116 int idx;
117 if (cons->device && cons->device(cons, &idx) == p &&
118 idx == tty_line) {
119 kgdboc_io_ops.is_console = 1;
120 break;
121 }
122 cons = cons->next;
123 }
124
64 kgdb_tty_driver = p; 125 kgdb_tty_driver = p;
65 kgdb_tty_line = tty_line; 126 kgdb_tty_line = tty_line;
66 127
128do_register:
67 err = kgdb_register_io_module(&kgdboc_io_ops); 129 err = kgdb_register_io_module(&kgdboc_io_ops);
68 if (err) 130 if (err)
69 goto noconfig; 131 goto noconfig;
@@ -75,6 +137,7 @@ static int configure_kgdboc(void)
75noconfig: 137noconfig:
76 config[0] = 0; 138 config[0] = 0;
77 configured = 0; 139 configured = 0;
140 cleanup_kgdboc();
78 141
79 return err; 142 return err;
80} 143}
@@ -88,20 +151,18 @@ static int __init init_kgdboc(void)
88 return configure_kgdboc(); 151 return configure_kgdboc();
89} 152}
90 153
91static void cleanup_kgdboc(void)
92{
93 if (configured == 1)
94 kgdb_unregister_io_module(&kgdboc_io_ops);
95}
96
97static int kgdboc_get_char(void) 154static int kgdboc_get_char(void)
98{ 155{
156 if (!kgdb_tty_driver)
157 return -1;
99 return kgdb_tty_driver->ops->poll_get_char(kgdb_tty_driver, 158 return kgdb_tty_driver->ops->poll_get_char(kgdb_tty_driver,
100 kgdb_tty_line); 159 kgdb_tty_line);
101} 160}
102 161
103static void kgdboc_put_char(u8 chr) 162static void kgdboc_put_char(u8 chr)
104{ 163{
164 if (!kgdb_tty_driver)
165 return;
105 kgdb_tty_driver->ops->poll_put_char(kgdb_tty_driver, 166 kgdb_tty_driver->ops->poll_put_char(kgdb_tty_driver,
106 kgdb_tty_line, chr); 167 kgdb_tty_line, chr);
107} 168}
diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index 8d993c4cceac..f250a610a268 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -151,7 +151,11 @@ static int sci_poll_get_char(struct uart_port *port)
151 handle_error(port); 151 handle_error(port);
152 continue; 152 continue;
153 } 153 }
154 } while (!(status & SCxSR_RDxF(port))); 154 break;
155 } while (1);
156
157 if (!(status & SCxSR_RDxF(port)))
158 return NO_POLL_CHAR;
155 159
156 c = sci_in(port, SCxRDR); 160 c = sci_in(port, SCxRDR);
157 161
diff --git a/drivers/serial/sunzilog.c b/drivers/serial/sunzilog.c
index 2c7a66af4f52..978b3cee02d7 100644
--- a/drivers/serial/sunzilog.c
+++ b/drivers/serial/sunzilog.c
@@ -102,6 +102,8 @@ struct uart_sunzilog_port {
102#endif 102#endif
103}; 103};
104 104
105static void sunzilog_putchar(struct uart_port *port, int ch);
106
105#define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase)) 107#define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
106#define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT)) 108#define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
107 109
@@ -996,6 +998,50 @@ static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *se
996 return -EINVAL; 998 return -EINVAL;
997} 999}
998 1000
1001#ifdef CONFIG_CONSOLE_POLL
1002static int sunzilog_get_poll_char(struct uart_port *port)
1003{
1004 unsigned char ch, r1;
1005 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
1006 struct zilog_channel __iomem *channel
1007 = ZILOG_CHANNEL_FROM_PORT(&up->port);
1008
1009
1010 r1 = read_zsreg(channel, R1);
1011 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
1012 writeb(ERR_RES, &channel->control);
1013 ZSDELAY();
1014 ZS_WSYNC(channel);
1015 }
1016
1017 ch = readb(&channel->control);
1018 ZSDELAY();
1019
1020 /* This funny hack depends upon BRK_ABRT not interfering
1021 * with the other bits we care about in R1.
1022 */
1023 if (ch & BRK_ABRT)
1024 r1 |= BRK_ABRT;
1025
1026 if (!(ch & Rx_CH_AV))
1027 return NO_POLL_CHAR;
1028
1029 ch = readb(&channel->data);
1030 ZSDELAY();
1031
1032 ch &= up->parity_mask;
1033 return ch;
1034}
1035
1036static void sunzilog_put_poll_char(struct uart_port *port,
1037 unsigned char ch)
1038{
1039 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *)port;
1040
1041 sunzilog_putchar(&up->port, ch);
1042}
1043#endif /* CONFIG_CONSOLE_POLL */
1044
999static struct uart_ops sunzilog_pops = { 1045static struct uart_ops sunzilog_pops = {
1000 .tx_empty = sunzilog_tx_empty, 1046 .tx_empty = sunzilog_tx_empty,
1001 .set_mctrl = sunzilog_set_mctrl, 1047 .set_mctrl = sunzilog_set_mctrl,
@@ -1013,6 +1059,10 @@ static struct uart_ops sunzilog_pops = {
1013 .request_port = sunzilog_request_port, 1059 .request_port = sunzilog_request_port,
1014 .config_port = sunzilog_config_port, 1060 .config_port = sunzilog_config_port,
1015 .verify_port = sunzilog_verify_port, 1061 .verify_port = sunzilog_verify_port,
1062#ifdef CONFIG_CONSOLE_POLL
1063 .poll_get_char = sunzilog_get_poll_char,
1064 .poll_put_char = sunzilog_put_poll_char,
1065#endif
1016}; 1066};
1017 1067
1018static int uart_chip_count; 1068static int uart_chip_count;
diff --git a/include/asm-generic/kmap_types.h b/include/asm-generic/kmap_types.h
index e5f234a08540..97e807c8c812 100644
--- a/include/asm-generic/kmap_types.h
+++ b/include/asm-generic/kmap_types.h
@@ -28,7 +28,8 @@ KMAP_D(15) KM_UML_USERCOPY,
28KMAP_D(16) KM_IRQ_PTE, 28KMAP_D(16) KM_IRQ_PTE,
29KMAP_D(17) KM_NMI, 29KMAP_D(17) KM_NMI,
30KMAP_D(18) KM_NMI_PTE, 30KMAP_D(18) KM_NMI_PTE,
31KMAP_D(19) KM_TYPE_NR 31KMAP_D(19) KM_KDB,
32KMAP_D(20) KM_TYPE_NR
32}; 33};
33 34
34#undef KMAP_D 35#undef KMAP_D
diff --git a/include/linux/kdb.h b/include/linux/kdb.h
new file mode 100644
index 000000000000..ccb2b3ec0fe8
--- /dev/null
+++ b/include/linux/kdb.h
@@ -0,0 +1,117 @@
1#ifndef _KDB_H
2#define _KDB_H
3
4/*
5 * Kernel Debugger Architecture Independent Global Headers
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
9 * for more details.
10 *
11 * Copyright (c) 2000-2007 Silicon Graphics, Inc. All Rights Reserved.
12 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
13 * Copyright (C) 2009 Jason Wessel <jason.wessel@windriver.com>
14 */
15
16#ifdef CONFIG_KGDB_KDB
17#include <linux/init.h>
18#include <linux/sched.h>
19#include <asm/atomic.h>
20
21#define KDB_POLL_FUNC_MAX 5
22extern int kdb_poll_idx;
23
24/*
25 * kdb_initial_cpu is initialized to -1, and is set to the cpu
26 * number whenever the kernel debugger is entered.
27 */
28extern int kdb_initial_cpu;
29extern atomic_t kdb_event;
30
31/*
32 * kdb_diemsg
33 *
34 * Contains a pointer to the last string supplied to the
35 * kernel 'die' panic function.
36 */
37extern const char *kdb_diemsg;
38
39#define KDB_FLAG_EARLYKDB (1 << 0) /* set from boot parameter kdb=early */
40#define KDB_FLAG_CATASTROPHIC (1 << 1) /* A catastrophic event has occurred */
41#define KDB_FLAG_CMD_INTERRUPT (1 << 2) /* Previous command was interrupted */
42#define KDB_FLAG_NOIPI (1 << 3) /* Do not send IPIs */
43#define KDB_FLAG_ONLY_DO_DUMP (1 << 4) /* Only do a dump, used when
44 * kdb is off */
45#define KDB_FLAG_NO_CONSOLE (1 << 5) /* No console is available,
46 * kdb is disabled */
47#define KDB_FLAG_NO_VT_CONSOLE (1 << 6) /* No VT console is available, do
48 * not use keyboard */
49#define KDB_FLAG_NO_I8042 (1 << 7) /* No i8042 chip is available, do
50 * not use keyboard */
51
52extern int kdb_flags; /* Global flags, see kdb_state for per cpu state */
53
54extern void kdb_save_flags(void);
55extern void kdb_restore_flags(void);
56
57#define KDB_FLAG(flag) (kdb_flags & KDB_FLAG_##flag)
58#define KDB_FLAG_SET(flag) ((void)(kdb_flags |= KDB_FLAG_##flag))
59#define KDB_FLAG_CLEAR(flag) ((void)(kdb_flags &= ~KDB_FLAG_##flag))
60
61/*
62 * External entry point for the kernel debugger. The pt_regs
63 * at the time of entry are supplied along with the reason for
64 * entry to the kernel debugger.
65 */
66
67typedef enum {
68 KDB_REASON_ENTER = 1, /* KDB_ENTER() trap/fault - regs valid */
69 KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */
70 KDB_REASON_BREAK, /* Breakpoint inst. - regs valid */
71 KDB_REASON_DEBUG, /* Debug Fault - regs valid */
72 KDB_REASON_OOPS, /* Kernel Oops - regs valid */
73 KDB_REASON_SWITCH, /* CPU switch - regs valid*/
74 KDB_REASON_KEYBOARD, /* Keyboard entry - regs valid */
75 KDB_REASON_NMI, /* Non-maskable interrupt; regs valid */
76 KDB_REASON_RECURSE, /* Recursive entry to kdb;
77 * regs probably valid */
78 KDB_REASON_SSTEP, /* Single Step trap. - regs valid */
79} kdb_reason_t;
80
81extern int kdb_trap_printk;
82extern int vkdb_printf(const char *fmt, va_list args)
83 __attribute__ ((format (printf, 1, 0)));
84extern int kdb_printf(const char *, ...)
85 __attribute__ ((format (printf, 1, 2)));
86typedef int (*kdb_printf_t)(const char *, ...)
87 __attribute__ ((format (printf, 1, 2)));
88
89extern void kdb_init(int level);
90
91/* Access to kdb specific polling devices */
92typedef int (*get_char_func)(void);
93extern get_char_func kdb_poll_funcs[];
94extern int kdb_get_kbd_char(void);
95
96static inline
97int kdb_process_cpu(const struct task_struct *p)
98{
99 unsigned int cpu = task_thread_info(p)->cpu;
100 if (cpu > num_possible_cpus())
101 cpu = 0;
102 return cpu;
103}
104
105/* kdb access to register set for stack dumping */
106extern struct pt_regs *kdb_current_regs;
107
108#else /* ! CONFIG_KGDB_KDB */
109#define kdb_printf(...)
110#define kdb_init(x)
111#endif /* CONFIG_KGDB_KDB */
112enum {
113 KDB_NOT_INITIALIZED,
114 KDB_INIT_EARLY,
115 KDB_INIT_FULL,
116};
117#endif /* !_KDB_H */
diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h
index 19ec41a183f5..6c784ab6856a 100644
--- a/include/linux/kgdb.h
+++ b/include/linux/kgdb.h
@@ -16,10 +16,12 @@
16#include <linux/serial_8250.h> 16#include <linux/serial_8250.h>
17#include <linux/linkage.h> 17#include <linux/linkage.h>
18#include <linux/init.h> 18#include <linux/init.h>
19
20#include <asm/atomic.h> 19#include <asm/atomic.h>
20#ifdef CONFIG_HAVE_ARCH_KGDB
21#include <asm/kgdb.h> 21#include <asm/kgdb.h>
22#endif
22 23
24#ifdef CONFIG_KGDB
23struct pt_regs; 25struct pt_regs;
24 26
25/** 27/**
@@ -34,20 +36,6 @@ struct pt_regs;
34extern int kgdb_skipexception(int exception, struct pt_regs *regs); 36extern int kgdb_skipexception(int exception, struct pt_regs *regs);
35 37
36/** 38/**
37 * kgdb_post_primary_code - (optional) Save error vector/code numbers.
38 * @regs: Original pt_regs.
39 * @e_vector: Original error vector.
40 * @err_code: Original error code.
41 *
42 * This is usually needed on architectures which support SMP and
43 * KGDB. This function is called after all the secondary cpus have
44 * been put to a know spin state and the primary CPU has control over
45 * KGDB.
46 */
47extern void kgdb_post_primary_code(struct pt_regs *regs, int e_vector,
48 int err_code);
49
50/**
51 * kgdb_disable_hw_debug - (optional) Disable hardware debugging hook 39 * kgdb_disable_hw_debug - (optional) Disable hardware debugging hook
52 * @regs: Current &struct pt_regs. 40 * @regs: Current &struct pt_regs.
53 * 41 *
@@ -72,6 +60,7 @@ struct uart_port;
72void kgdb_breakpoint(void); 60void kgdb_breakpoint(void);
73 61
74extern int kgdb_connected; 62extern int kgdb_connected;
63extern int kgdb_io_module_registered;
75 64
76extern atomic_t kgdb_setting_breakpoint; 65extern atomic_t kgdb_setting_breakpoint;
77extern atomic_t kgdb_cpu_doing_single_step; 66extern atomic_t kgdb_cpu_doing_single_step;
@@ -202,6 +191,17 @@ kgdb_arch_handle_exception(int vector, int signo, int err_code,
202 */ 191 */
203extern void kgdb_roundup_cpus(unsigned long flags); 192extern void kgdb_roundup_cpus(unsigned long flags);
204 193
194/**
195 * kgdb_arch_set_pc - Generic call back to the program counter
196 * @regs: Current &struct pt_regs.
197 * @pc: The new value for the program counter
198 *
199 * This function handles updating the program counter and requires an
200 * architecture specific implementation.
201 */
202extern void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc);
203
204
205/* Optional functions. */ 205/* Optional functions. */
206extern int kgdb_validate_break_address(unsigned long addr); 206extern int kgdb_validate_break_address(unsigned long addr);
207extern int kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr); 207extern int kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr);
@@ -247,6 +247,8 @@ struct kgdb_arch {
247 * the I/O driver. 247 * the I/O driver.
248 * @post_exception: Pointer to a function that will do any cleanup work 248 * @post_exception: Pointer to a function that will do any cleanup work
249 * for the I/O driver. 249 * for the I/O driver.
250 * @is_console: 1 if the end device is a console 0 if the I/O device is
251 * not a console
250 */ 252 */
251struct kgdb_io { 253struct kgdb_io {
252 const char *name; 254 const char *name;
@@ -256,6 +258,7 @@ struct kgdb_io {
256 int (*init) (void); 258 int (*init) (void);
257 void (*pre_exception) (void); 259 void (*pre_exception) (void);
258 void (*post_exception) (void); 260 void (*post_exception) (void);
261 int is_console;
259}; 262};
260 263
261extern struct kgdb_arch arch_kgdb_ops; 264extern struct kgdb_arch arch_kgdb_ops;
@@ -264,12 +267,14 @@ extern unsigned long __weak kgdb_arch_pc(int exception, struct pt_regs *regs);
264 267
265extern int kgdb_register_io_module(struct kgdb_io *local_kgdb_io_ops); 268extern int kgdb_register_io_module(struct kgdb_io *local_kgdb_io_ops);
266extern void kgdb_unregister_io_module(struct kgdb_io *local_kgdb_io_ops); 269extern void kgdb_unregister_io_module(struct kgdb_io *local_kgdb_io_ops);
270extern struct kgdb_io *dbg_io_ops;
267 271
268extern int kgdb_hex2long(char **ptr, unsigned long *long_val); 272extern int kgdb_hex2long(char **ptr, unsigned long *long_val);
269extern int kgdb_mem2hex(char *mem, char *buf, int count); 273extern int kgdb_mem2hex(char *mem, char *buf, int count);
270extern int kgdb_hex2mem(char *buf, char *mem, int count); 274extern int kgdb_hex2mem(char *buf, char *mem, int count);
271 275
272extern int kgdb_isremovedbreak(unsigned long addr); 276extern int kgdb_isremovedbreak(unsigned long addr);
277extern void kgdb_schedule_breakpoint(void);
273 278
274extern int 279extern int
275kgdb_handle_exception(int ex_vector, int signo, int err_code, 280kgdb_handle_exception(int ex_vector, int signo, int err_code,
@@ -278,5 +283,9 @@ extern int kgdb_nmicallback(int cpu, void *regs);
278 283
279extern int kgdb_single_step; 284extern int kgdb_single_step;
280extern atomic_t kgdb_active; 285extern atomic_t kgdb_active;
281 286#define in_dbg_master() \
287 (raw_smp_processor_id() == atomic_read(&kgdb_active))
288#else /* ! CONFIG_KGDB */
289#define in_dbg_master() (0)
290#endif /* ! CONFIG_KGDB */
282#endif /* _KGDB_H_ */ 291#endif /* _KGDB_H_ */
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 09d0d2d5a08b..f10db6e5f3b5 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -250,6 +250,7 @@ struct uart_ops {
250#endif 250#endif
251}; 251};
252 252
253#define NO_POLL_CHAR 0x00ff0000
253#define UART_CONFIG_TYPE (1 << 0) 254#define UART_CONFIG_TYPE (1 << 0)
254#define UART_CONFIG_IRQ (1 << 1) 255#define UART_CONFIG_IRQ (1 << 1)
255 256
diff --git a/init/main.c b/init/main.c
index 5c8540271529..372771333d98 100644
--- a/init/main.c
+++ b/init/main.c
@@ -62,6 +62,7 @@
62#include <linux/sched.h> 62#include <linux/sched.h>
63#include <linux/signal.h> 63#include <linux/signal.h>
64#include <linux/idr.h> 64#include <linux/idr.h>
65#include <linux/kdb.h>
65#include <linux/ftrace.h> 66#include <linux/ftrace.h>
66#include <linux/async.h> 67#include <linux/async.h>
67#include <linux/kmemcheck.h> 68#include <linux/kmemcheck.h>
@@ -675,6 +676,7 @@ asmlinkage void __init start_kernel(void)
675 buffer_init(); 676 buffer_init();
676 key_init(); 677 key_init();
677 security_init(); 678 security_init();
679 kdb_init(KDB_INIT_FULL);
678 vfs_caches_init(totalram_pages); 680 vfs_caches_init(totalram_pages);
679 signals_init(); 681 signals_init();
680 /* rootfs populating might need page-writeback */ 682 /* rootfs populating might need page-writeback */
diff --git a/kernel/Makefile b/kernel/Makefile
index 149e18ef1ab1..057472fbc272 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -75,7 +75,7 @@ obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
75obj-$(CONFIG_GCOV_KERNEL) += gcov/ 75obj-$(CONFIG_GCOV_KERNEL) += gcov/
76obj-$(CONFIG_AUDIT_TREE) += audit_tree.o 76obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
77obj-$(CONFIG_KPROBES) += kprobes.o 77obj-$(CONFIG_KPROBES) += kprobes.o
78obj-$(CONFIG_KGDB) += kgdb.o 78obj-$(CONFIG_KGDB) += debug/
79obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o 79obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o
80obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o 80obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
81obj-$(CONFIG_GENERIC_HARDIRQS) += irq/ 81obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
diff --git a/kernel/debug/Makefile b/kernel/debug/Makefile
new file mode 100644
index 000000000000..a85edc339985
--- /dev/null
+++ b/kernel/debug/Makefile
@@ -0,0 +1,6 @@
1#
2# Makefile for the linux kernel debugger
3#
4
5obj-$(CONFIG_KGDB) += debug_core.o gdbstub.o
6obj-$(CONFIG_KGDB_KDB) += kdb/
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
new file mode 100644
index 000000000000..64b5588c9638
--- /dev/null
+++ b/kernel/debug/debug_core.c
@@ -0,0 +1,967 @@
1/*
2 * Kernel Debug Core
3 *
4 * Maintainer: Jason Wessel <jason.wessel@windriver.com>
5 *
6 * Copyright (C) 2000-2001 VERITAS Software Corporation.
7 * Copyright (C) 2002-2004 Timesys Corporation
8 * Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
9 * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
10 * Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
11 * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
12 * Copyright (C) 2005-2009 Wind River Systems, Inc.
13 * Copyright (C) 2007 MontaVista Software, Inc.
14 * Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
15 *
16 * Contributors at various stages not listed above:
17 * Jason Wessel ( jason.wessel@windriver.com )
18 * George Anzinger <george@mvista.com>
19 * Anurekh Saxena (anurekh.saxena@timesys.com)
20 * Lake Stevens Instrument Division (Glenn Engel)
21 * Jim Kingdon, Cygnus Support.
22 *
23 * Original KGDB stub: David Grothe <dave@gcom.com>,
24 * Tigran Aivazian <tigran@sco.com>
25 *
26 * This file is licensed under the terms of the GNU General Public License
27 * version 2. This program is licensed "as is" without any warranty of any
28 * kind, whether express or implied.
29 */
30#include <linux/pid_namespace.h>
31#include <linux/clocksource.h>
32#include <linux/interrupt.h>
33#include <linux/spinlock.h>
34#include <linux/console.h>
35#include <linux/threads.h>
36#include <linux/uaccess.h>
37#include <linux/kernel.h>
38#include <linux/module.h>
39#include <linux/ptrace.h>
40#include <linux/string.h>
41#include <linux/delay.h>
42#include <linux/sched.h>
43#include <linux/sysrq.h>
44#include <linux/init.h>
45#include <linux/kgdb.h>
46#include <linux/kdb.h>
47#include <linux/pid.h>
48#include <linux/smp.h>
49#include <linux/mm.h>
50
51#include <asm/cacheflush.h>
52#include <asm/byteorder.h>
53#include <asm/atomic.h>
54#include <asm/system.h>
55
56#include "debug_core.h"
57
58static int kgdb_break_asap;
59
60struct debuggerinfo_struct kgdb_info[NR_CPUS];
61
62/**
63 * kgdb_connected - Is a host GDB connected to us?
64 */
65int kgdb_connected;
66EXPORT_SYMBOL_GPL(kgdb_connected);
67
68/* All the KGDB handlers are installed */
69int kgdb_io_module_registered;
70
71/* Guard for recursive entry */
72static int exception_level;
73
74struct kgdb_io *dbg_io_ops;
75static DEFINE_SPINLOCK(kgdb_registration_lock);
76
77/* kgdb console driver is loaded */
78static int kgdb_con_registered;
79/* determine if kgdb console output should be used */
80static int kgdb_use_con;
81/* Next cpu to become the master debug core */
82int dbg_switch_cpu;
83
84/* Use kdb or gdbserver mode */
85int dbg_kdb_mode = 1;
86
87static int __init opt_kgdb_con(char *str)
88{
89 kgdb_use_con = 1;
90 return 0;
91}
92
93early_param("kgdbcon", opt_kgdb_con);
94
95module_param(kgdb_use_con, int, 0644);
96
97/*
98 * Holds information about breakpoints in a kernel. These breakpoints are
99 * added and removed by gdb.
100 */
101static struct kgdb_bkpt kgdb_break[KGDB_MAX_BREAKPOINTS] = {
102 [0 ... KGDB_MAX_BREAKPOINTS-1] = { .state = BP_UNDEFINED }
103};
104
105/*
106 * The CPU# of the active CPU, or -1 if none:
107 */
108atomic_t kgdb_active = ATOMIC_INIT(-1);
109EXPORT_SYMBOL_GPL(kgdb_active);
110
111/*
112 * We use NR_CPUs not PERCPU, in case kgdb is used to debug early
113 * bootup code (which might not have percpu set up yet):
114 */
115static atomic_t passive_cpu_wait[NR_CPUS];
116static atomic_t cpu_in_kgdb[NR_CPUS];
117static atomic_t kgdb_break_tasklet_var;
118atomic_t kgdb_setting_breakpoint;
119
120struct task_struct *kgdb_usethread;
121struct task_struct *kgdb_contthread;
122
123int kgdb_single_step;
124static pid_t kgdb_sstep_pid;
125
126/* to keep track of the CPU which is doing the single stepping*/
127atomic_t kgdb_cpu_doing_single_step = ATOMIC_INIT(-1);
128
129/*
130 * If you are debugging a problem where roundup (the collection of
131 * all other CPUs) is a problem [this should be extremely rare],
132 * then use the nokgdbroundup option to avoid roundup. In that case
133 * the other CPUs might interfere with your debugging context, so
134 * use this with care:
135 */
136static int kgdb_do_roundup = 1;
137
138static int __init opt_nokgdbroundup(char *str)
139{
140 kgdb_do_roundup = 0;
141
142 return 0;
143}
144
145early_param("nokgdbroundup", opt_nokgdbroundup);
146
147/*
148 * Finally, some KGDB code :-)
149 */
150
151/*
152 * Weak aliases for breakpoint management,
153 * can be overriden by architectures when needed:
154 */
155int __weak kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)
156{
157 int err;
158
159 err = probe_kernel_read(saved_instr, (char *)addr, BREAK_INSTR_SIZE);
160 if (err)
161 return err;
162
163 return probe_kernel_write((char *)addr, arch_kgdb_ops.gdb_bpt_instr,
164 BREAK_INSTR_SIZE);
165}
166
167int __weak kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
168{
169 return probe_kernel_write((char *)addr,
170 (char *)bundle, BREAK_INSTR_SIZE);
171}
172
173int __weak kgdb_validate_break_address(unsigned long addr)
174{
175 char tmp_variable[BREAK_INSTR_SIZE];
176 int err;
177 /* Validate setting the breakpoint and then removing it. In the
178 * remove fails, the kernel needs to emit a bad message because we
179 * are deep trouble not being able to put things back the way we
180 * found them.
181 */
182 err = kgdb_arch_set_breakpoint(addr, tmp_variable);
183 if (err)
184 return err;
185 err = kgdb_arch_remove_breakpoint(addr, tmp_variable);
186 if (err)
187 printk(KERN_ERR "KGDB: Critical breakpoint error, kernel "
188 "memory destroyed at: %lx", addr);
189 return err;
190}
191
192unsigned long __weak kgdb_arch_pc(int exception, struct pt_regs *regs)
193{
194 return instruction_pointer(regs);
195}
196
197int __weak kgdb_arch_init(void)
198{
199 return 0;
200}
201
202int __weak kgdb_skipexception(int exception, struct pt_regs *regs)
203{
204 return 0;
205}
206
207/**
208 * kgdb_disable_hw_debug - Disable hardware debugging while we in kgdb.
209 * @regs: Current &struct pt_regs.
210 *
211 * This function will be called if the particular architecture must
212 * disable hardware debugging while it is processing gdb packets or
213 * handling exception.
214 */
215void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
216{
217}
218
219/*
220 * Some architectures need cache flushes when we set/clear a
221 * breakpoint:
222 */
223static void kgdb_flush_swbreak_addr(unsigned long addr)
224{
225 if (!CACHE_FLUSH_IS_SAFE)
226 return;
227
228 if (current->mm && current->mm->mmap_cache) {
229 flush_cache_range(current->mm->mmap_cache,
230 addr, addr + BREAK_INSTR_SIZE);
231 }
232 /* Force flush instruction cache if it was outside the mm */
233 flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
234}
235
236/*
237 * SW breakpoint management:
238 */
239int dbg_activate_sw_breakpoints(void)
240{
241 unsigned long addr;
242 int error;
243 int ret = 0;
244 int i;
245
246 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
247 if (kgdb_break[i].state != BP_SET)
248 continue;
249
250 addr = kgdb_break[i].bpt_addr;
251 error = kgdb_arch_set_breakpoint(addr,
252 kgdb_break[i].saved_instr);
253 if (error) {
254 ret = error;
255 printk(KERN_INFO "KGDB: BP install failed: %lx", addr);
256 continue;
257 }
258
259 kgdb_flush_swbreak_addr(addr);
260 kgdb_break[i].state = BP_ACTIVE;
261 }
262 return ret;
263}
264
265int dbg_set_sw_break(unsigned long addr)
266{
267 int err = kgdb_validate_break_address(addr);
268 int breakno = -1;
269 int i;
270
271 if (err)
272 return err;
273
274 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
275 if ((kgdb_break[i].state == BP_SET) &&
276 (kgdb_break[i].bpt_addr == addr))
277 return -EEXIST;
278 }
279 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
280 if (kgdb_break[i].state == BP_REMOVED &&
281 kgdb_break[i].bpt_addr == addr) {
282 breakno = i;
283 break;
284 }
285 }
286
287 if (breakno == -1) {
288 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
289 if (kgdb_break[i].state == BP_UNDEFINED) {
290 breakno = i;
291 break;
292 }
293 }
294 }
295
296 if (breakno == -1)
297 return -E2BIG;
298
299 kgdb_break[breakno].state = BP_SET;
300 kgdb_break[breakno].type = BP_BREAKPOINT;
301 kgdb_break[breakno].bpt_addr = addr;
302
303 return 0;
304}
305
306int dbg_deactivate_sw_breakpoints(void)
307{
308 unsigned long addr;
309 int error;
310 int ret = 0;
311 int i;
312
313 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
314 if (kgdb_break[i].state != BP_ACTIVE)
315 continue;
316 addr = kgdb_break[i].bpt_addr;
317 error = kgdb_arch_remove_breakpoint(addr,
318 kgdb_break[i].saved_instr);
319 if (error) {
320 printk(KERN_INFO "KGDB: BP remove failed: %lx\n", addr);
321 ret = error;
322 }
323
324 kgdb_flush_swbreak_addr(addr);
325 kgdb_break[i].state = BP_SET;
326 }
327 return ret;
328}
329
330int dbg_remove_sw_break(unsigned long addr)
331{
332 int i;
333
334 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
335 if ((kgdb_break[i].state == BP_SET) &&
336 (kgdb_break[i].bpt_addr == addr)) {
337 kgdb_break[i].state = BP_REMOVED;
338 return 0;
339 }
340 }
341 return -ENOENT;
342}
343
344int kgdb_isremovedbreak(unsigned long addr)
345{
346 int i;
347
348 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
349 if ((kgdb_break[i].state == BP_REMOVED) &&
350 (kgdb_break[i].bpt_addr == addr))
351 return 1;
352 }
353 return 0;
354}
355
356int dbg_remove_all_break(void)
357{
358 unsigned long addr;
359 int error;
360 int i;
361
362 /* Clear memory breakpoints. */
363 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
364 if (kgdb_break[i].state != BP_ACTIVE)
365 goto setundefined;
366 addr = kgdb_break[i].bpt_addr;
367 error = kgdb_arch_remove_breakpoint(addr,
368 kgdb_break[i].saved_instr);
369 if (error)
370 printk(KERN_ERR "KGDB: breakpoint remove failed: %lx\n",
371 addr);
372setundefined:
373 kgdb_break[i].state = BP_UNDEFINED;
374 }
375
376 /* Clear hardware breakpoints. */
377 if (arch_kgdb_ops.remove_all_hw_break)
378 arch_kgdb_ops.remove_all_hw_break();
379
380 return 0;
381}
382
383/*
384 * Return true if there is a valid kgdb I/O module. Also if no
385 * debugger is attached a message can be printed to the console about
386 * waiting for the debugger to attach.
387 *
388 * The print_wait argument is only to be true when called from inside
389 * the core kgdb_handle_exception, because it will wait for the
390 * debugger to attach.
391 */
392static int kgdb_io_ready(int print_wait)
393{
394 if (!dbg_io_ops)
395 return 0;
396 if (kgdb_connected)
397 return 1;
398 if (atomic_read(&kgdb_setting_breakpoint))
399 return 1;
400 if (print_wait) {
401#ifdef CONFIG_KGDB_KDB
402 if (!dbg_kdb_mode)
403 printk(KERN_CRIT "KGDB: waiting... or $3#33 for KDB\n");
404#else
405 printk(KERN_CRIT "KGDB: Waiting for remote debugger\n");
406#endif
407 }
408 return 1;
409}
410
411static int kgdb_reenter_check(struct kgdb_state *ks)
412{
413 unsigned long addr;
414
415 if (atomic_read(&kgdb_active) != raw_smp_processor_id())
416 return 0;
417
418 /* Panic on recursive debugger calls: */
419 exception_level++;
420 addr = kgdb_arch_pc(ks->ex_vector, ks->linux_regs);
421 dbg_deactivate_sw_breakpoints();
422
423 /*
424 * If the break point removed ok at the place exception
425 * occurred, try to recover and print a warning to the end
426 * user because the user planted a breakpoint in a place that
427 * KGDB needs in order to function.
428 */
429 if (dbg_remove_sw_break(addr) == 0) {
430 exception_level = 0;
431 kgdb_skipexception(ks->ex_vector, ks->linux_regs);
432 dbg_activate_sw_breakpoints();
433 printk(KERN_CRIT "KGDB: re-enter error: breakpoint removed %lx\n",
434 addr);
435 WARN_ON_ONCE(1);
436
437 return 1;
438 }
439 dbg_remove_all_break();
440 kgdb_skipexception(ks->ex_vector, ks->linux_regs);
441
442 if (exception_level > 1) {
443 dump_stack();
444 panic("Recursive entry to debugger");
445 }
446
447 printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n");
448#ifdef CONFIG_KGDB_KDB
449 /* Allow kdb to debug itself one level */
450 return 0;
451#endif
452 dump_stack();
453 panic("Recursive entry to debugger");
454
455 return 1;
456}
457
458static void dbg_cpu_switch(int cpu, int next_cpu)
459{
460 /* Mark the cpu we are switching away from as a slave when it
461 * holds the kgdb_active token. This must be done so that the
462 * that all the cpus wait in for the debug core will not enter
463 * again as the master. */
464 if (cpu == atomic_read(&kgdb_active)) {
465 kgdb_info[cpu].exception_state |= DCPU_IS_SLAVE;
466 kgdb_info[cpu].exception_state &= ~DCPU_WANT_MASTER;
467 }
468 kgdb_info[next_cpu].exception_state |= DCPU_NEXT_MASTER;
469}
470
471static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs)
472{
473 unsigned long flags;
474 int sstep_tries = 100;
475 int error;
476 int i, cpu;
477 int trace_on = 0;
478acquirelock:
479 /*
480 * Interrupts will be restored by the 'trap return' code, except when
481 * single stepping.
482 */
483 local_irq_save(flags);
484
485 cpu = ks->cpu;
486 kgdb_info[cpu].debuggerinfo = regs;
487 kgdb_info[cpu].task = current;
488 kgdb_info[cpu].ret_state = 0;
489 kgdb_info[cpu].irq_depth = hardirq_count() >> HARDIRQ_SHIFT;
490 /*
491 * Make sure the above info reaches the primary CPU before
492 * our cpu_in_kgdb[] flag setting does:
493 */
494 atomic_inc(&cpu_in_kgdb[cpu]);
495
496 if (exception_level == 1)
497 goto cpu_master_loop;
498
499 /*
500 * CPU will loop if it is a slave or request to become a kgdb
501 * master cpu and acquire the kgdb_active lock:
502 */
503 while (1) {
504cpu_loop:
505 if (kgdb_info[cpu].exception_state & DCPU_NEXT_MASTER) {
506 kgdb_info[cpu].exception_state &= ~DCPU_NEXT_MASTER;
507 goto cpu_master_loop;
508 } else if (kgdb_info[cpu].exception_state & DCPU_WANT_MASTER) {
509 if (atomic_cmpxchg(&kgdb_active, -1, cpu) == cpu)
510 break;
511 } else if (kgdb_info[cpu].exception_state & DCPU_IS_SLAVE) {
512 if (!atomic_read(&passive_cpu_wait[cpu]))
513 goto return_normal;
514 } else {
515return_normal:
516 /* Return to normal operation by executing any
517 * hw breakpoint fixup.
518 */
519 if (arch_kgdb_ops.correct_hw_break)
520 arch_kgdb_ops.correct_hw_break();
521 if (trace_on)
522 tracing_on();
523 atomic_dec(&cpu_in_kgdb[cpu]);
524 touch_softlockup_watchdog_sync();
525 clocksource_touch_watchdog();
526 local_irq_restore(flags);
527 return 0;
528 }
529 cpu_relax();
530 }
531
532 /*
533 * For single stepping, try to only enter on the processor
534 * that was single stepping. To gaurd against a deadlock, the
535 * kernel will only try for the value of sstep_tries before
536 * giving up and continuing on.
537 */
538 if (atomic_read(&kgdb_cpu_doing_single_step) != -1 &&
539 (kgdb_info[cpu].task &&
540 kgdb_info[cpu].task->pid != kgdb_sstep_pid) && --sstep_tries) {
541 atomic_set(&kgdb_active, -1);
542 touch_softlockup_watchdog_sync();
543 clocksource_touch_watchdog();
544 local_irq_restore(flags);
545
546 goto acquirelock;
547 }
548
549 if (!kgdb_io_ready(1)) {
550 kgdb_info[cpu].ret_state = 1;
551 goto kgdb_restore; /* No I/O connection, resume the system */
552 }
553
554 /*
555 * Don't enter if we have hit a removed breakpoint.
556 */
557 if (kgdb_skipexception(ks->ex_vector, ks->linux_regs))
558 goto kgdb_restore;
559
560 /* Call the I/O driver's pre_exception routine */
561 if (dbg_io_ops->pre_exception)
562 dbg_io_ops->pre_exception();
563
564 kgdb_disable_hw_debug(ks->linux_regs);
565
566 /*
567 * Get the passive CPU lock which will hold all the non-primary
568 * CPU in a spin state while the debugger is active
569 */
570 if (!kgdb_single_step) {
571 for (i = 0; i < NR_CPUS; i++)
572 atomic_inc(&passive_cpu_wait[i]);
573 }
574
575#ifdef CONFIG_SMP
576 /* Signal the other CPUs to enter kgdb_wait() */
577 if ((!kgdb_single_step) && kgdb_do_roundup)
578 kgdb_roundup_cpus(flags);
579#endif
580
581 /*
582 * Wait for the other CPUs to be notified and be waiting for us:
583 */
584 for_each_online_cpu(i) {
585 while (kgdb_do_roundup && !atomic_read(&cpu_in_kgdb[i]))
586 cpu_relax();
587 }
588
589 /*
590 * At this point the primary processor is completely
591 * in the debugger and all secondary CPUs are quiescent
592 */
593 dbg_deactivate_sw_breakpoints();
594 kgdb_single_step = 0;
595 kgdb_contthread = current;
596 exception_level = 0;
597 trace_on = tracing_is_on();
598 if (trace_on)
599 tracing_off();
600
601 while (1) {
602cpu_master_loop:
603 if (dbg_kdb_mode) {
604 kgdb_connected = 1;
605 error = kdb_stub(ks);
606 } else {
607 error = gdb_serial_stub(ks);
608 }
609
610 if (error == DBG_PASS_EVENT) {
611 dbg_kdb_mode = !dbg_kdb_mode;
612 kgdb_connected = 0;
613 } else if (error == DBG_SWITCH_CPU_EVENT) {
614 dbg_cpu_switch(cpu, dbg_switch_cpu);
615 goto cpu_loop;
616 } else {
617 kgdb_info[cpu].ret_state = error;
618 break;
619 }
620 }
621
622 /* Call the I/O driver's post_exception routine */
623 if (dbg_io_ops->post_exception)
624 dbg_io_ops->post_exception();
625
626 atomic_dec(&cpu_in_kgdb[ks->cpu]);
627
628 if (!kgdb_single_step) {
629 for (i = NR_CPUS-1; i >= 0; i--)
630 atomic_dec(&passive_cpu_wait[i]);
631 /*
632 * Wait till all the CPUs have quit from the debugger,
633 * but allow a CPU that hit an exception and is
634 * waiting to become the master to remain in the debug
635 * core.
636 */
637 for_each_online_cpu(i) {
638 while (kgdb_do_roundup &&
639 atomic_read(&cpu_in_kgdb[i]) &&
640 !(kgdb_info[i].exception_state &
641 DCPU_WANT_MASTER))
642 cpu_relax();
643 }
644 }
645
646kgdb_restore:
647 if (atomic_read(&kgdb_cpu_doing_single_step) != -1) {
648 int sstep_cpu = atomic_read(&kgdb_cpu_doing_single_step);
649 if (kgdb_info[sstep_cpu].task)
650 kgdb_sstep_pid = kgdb_info[sstep_cpu].task->pid;
651 else
652 kgdb_sstep_pid = 0;
653 }
654 if (trace_on)
655 tracing_on();
656 /* Free kgdb_active */
657 atomic_set(&kgdb_active, -1);
658 touch_softlockup_watchdog_sync();
659 clocksource_touch_watchdog();
660 local_irq_restore(flags);
661
662 return kgdb_info[cpu].ret_state;
663}
664
665/*
666 * kgdb_handle_exception() - main entry point from a kernel exception
667 *
668 * Locking hierarchy:
669 * interface locks, if any (begin_session)
670 * kgdb lock (kgdb_active)
671 */
672int
673kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
674{
675 struct kgdb_state kgdb_var;
676 struct kgdb_state *ks = &kgdb_var;
677 int ret;
678
679 ks->cpu = raw_smp_processor_id();
680 ks->ex_vector = evector;
681 ks->signo = signo;
682 ks->err_code = ecode;
683 ks->kgdb_usethreadid = 0;
684 ks->linux_regs = regs;
685
686 if (kgdb_reenter_check(ks))
687 return 0; /* Ouch, double exception ! */
688 kgdb_info[ks->cpu].exception_state |= DCPU_WANT_MASTER;
689 ret = kgdb_cpu_enter(ks, regs);
690 kgdb_info[ks->cpu].exception_state &= ~(DCPU_WANT_MASTER |
691 DCPU_IS_SLAVE);
692 return ret;
693}
694
695int kgdb_nmicallback(int cpu, void *regs)
696{
697#ifdef CONFIG_SMP
698 struct kgdb_state kgdb_var;
699 struct kgdb_state *ks = &kgdb_var;
700
701 memset(ks, 0, sizeof(struct kgdb_state));
702 ks->cpu = cpu;
703 ks->linux_regs = regs;
704
705 if (!atomic_read(&cpu_in_kgdb[cpu]) &&
706 atomic_read(&kgdb_active) != -1 &&
707 atomic_read(&kgdb_active) != cpu) {
708 kgdb_info[cpu].exception_state |= DCPU_IS_SLAVE;
709 kgdb_cpu_enter(ks, regs);
710 kgdb_info[cpu].exception_state &= ~DCPU_IS_SLAVE;
711 return 0;
712 }
713#endif
714 return 1;
715}
716
717static void kgdb_console_write(struct console *co, const char *s,
718 unsigned count)
719{
720 unsigned long flags;
721
722 /* If we're debugging, or KGDB has not connected, don't try
723 * and print. */
724 if (!kgdb_connected || atomic_read(&kgdb_active) != -1 || dbg_kdb_mode)
725 return;
726
727 local_irq_save(flags);
728 gdbstub_msg_write(s, count);
729 local_irq_restore(flags);
730}
731
732static struct console kgdbcons = {
733 .name = "kgdb",
734 .write = kgdb_console_write,
735 .flags = CON_PRINTBUFFER | CON_ENABLED,
736 .index = -1,
737};
738
739#ifdef CONFIG_MAGIC_SYSRQ
740static void sysrq_handle_dbg(int key, struct tty_struct *tty)
741{
742 if (!dbg_io_ops) {
743 printk(KERN_CRIT "ERROR: No KGDB I/O module available\n");
744 return;
745 }
746 if (!kgdb_connected) {
747#ifdef CONFIG_KGDB_KDB
748 if (!dbg_kdb_mode)
749 printk(KERN_CRIT "KGDB or $3#33 for KDB\n");
750#else
751 printk(KERN_CRIT "Entering KGDB\n");
752#endif
753 }
754
755 kgdb_breakpoint();
756}
757
758static struct sysrq_key_op sysrq_dbg_op = {
759 .handler = sysrq_handle_dbg,
760 .help_msg = "debug(G)",
761 .action_msg = "DEBUG",
762};
763#endif
764
765static int kgdb_panic_event(struct notifier_block *self,
766 unsigned long val,
767 void *data)
768{
769 if (dbg_kdb_mode)
770 kdb_printf("PANIC: %s\n", (char *)data);
771 kgdb_breakpoint();
772 return NOTIFY_DONE;
773}
774
775static struct notifier_block kgdb_panic_event_nb = {
776 .notifier_call = kgdb_panic_event,
777 .priority = INT_MAX,
778};
779
780static void kgdb_register_callbacks(void)
781{
782 if (!kgdb_io_module_registered) {
783 kgdb_io_module_registered = 1;
784 kgdb_arch_init();
785 atomic_notifier_chain_register(&panic_notifier_list,
786 &kgdb_panic_event_nb);
787#ifdef CONFIG_MAGIC_SYSRQ
788 register_sysrq_key('g', &sysrq_dbg_op);
789#endif
790 if (kgdb_use_con && !kgdb_con_registered) {
791 register_console(&kgdbcons);
792 kgdb_con_registered = 1;
793 }
794 }
795}
796
797static void kgdb_unregister_callbacks(void)
798{
799 /*
800 * When this routine is called KGDB should unregister from the
801 * panic handler and clean up, making sure it is not handling any
802 * break exceptions at the time.
803 */
804 if (kgdb_io_module_registered) {
805 kgdb_io_module_registered = 0;
806 atomic_notifier_chain_unregister(&panic_notifier_list,
807 &kgdb_panic_event_nb);
808 kgdb_arch_exit();
809#ifdef CONFIG_MAGIC_SYSRQ
810 unregister_sysrq_key('g', &sysrq_dbg_op);
811#endif
812 if (kgdb_con_registered) {
813 unregister_console(&kgdbcons);
814 kgdb_con_registered = 0;
815 }
816 }
817}
818
819/*
820 * There are times a tasklet needs to be used vs a compiled in
821 * break point so as to cause an exception outside a kgdb I/O module,
822 * such as is the case with kgdboe, where calling a breakpoint in the
823 * I/O driver itself would be fatal.
824 */
825static void kgdb_tasklet_bpt(unsigned long ing)
826{
827 kgdb_breakpoint();
828 atomic_set(&kgdb_break_tasklet_var, 0);
829}
830
831static DECLARE_TASKLET(kgdb_tasklet_breakpoint, kgdb_tasklet_bpt, 0);
832
833void kgdb_schedule_breakpoint(void)
834{
835 if (atomic_read(&kgdb_break_tasklet_var) ||
836 atomic_read(&kgdb_active) != -1 ||
837 atomic_read(&kgdb_setting_breakpoint))
838 return;
839 atomic_inc(&kgdb_break_tasklet_var);
840 tasklet_schedule(&kgdb_tasklet_breakpoint);
841}
842EXPORT_SYMBOL_GPL(kgdb_schedule_breakpoint);
843
844static void kgdb_initial_breakpoint(void)
845{
846 kgdb_break_asap = 0;
847
848 printk(KERN_CRIT "kgdb: Waiting for connection from remote gdb...\n");
849 kgdb_breakpoint();
850}
851
852/**
853 * kgdb_register_io_module - register KGDB IO module
854 * @new_dbg_io_ops: the io ops vector
855 *
856 * Register it with the KGDB core.
857 */
858int kgdb_register_io_module(struct kgdb_io *new_dbg_io_ops)
859{
860 int err;
861
862 spin_lock(&kgdb_registration_lock);
863
864 if (dbg_io_ops) {
865 spin_unlock(&kgdb_registration_lock);
866
867 printk(KERN_ERR "kgdb: Another I/O driver is already "
868 "registered with KGDB.\n");
869 return -EBUSY;
870 }
871
872 if (new_dbg_io_ops->init) {
873 err = new_dbg_io_ops->init();
874 if (err) {
875 spin_unlock(&kgdb_registration_lock);
876 return err;
877 }
878 }
879
880 dbg_io_ops = new_dbg_io_ops;
881
882 spin_unlock(&kgdb_registration_lock);
883
884 printk(KERN_INFO "kgdb: Registered I/O driver %s.\n",
885 new_dbg_io_ops->name);
886
887 /* Arm KGDB now. */
888 kgdb_register_callbacks();
889
890 if (kgdb_break_asap)
891 kgdb_initial_breakpoint();
892
893 return 0;
894}
895EXPORT_SYMBOL_GPL(kgdb_register_io_module);
896
897/**
898 * kkgdb_unregister_io_module - unregister KGDB IO module
899 * @old_dbg_io_ops: the io ops vector
900 *
901 * Unregister it with the KGDB core.
902 */
903void kgdb_unregister_io_module(struct kgdb_io *old_dbg_io_ops)
904{
905 BUG_ON(kgdb_connected);
906
907 /*
908 * KGDB is no longer able to communicate out, so
909 * unregister our callbacks and reset state.
910 */
911 kgdb_unregister_callbacks();
912
913 spin_lock(&kgdb_registration_lock);
914
915 WARN_ON_ONCE(dbg_io_ops != old_dbg_io_ops);
916 dbg_io_ops = NULL;
917
918 spin_unlock(&kgdb_registration_lock);
919
920 printk(KERN_INFO
921 "kgdb: Unregistered I/O driver %s, debugger disabled.\n",
922 old_dbg_io_ops->name);
923}
924EXPORT_SYMBOL_GPL(kgdb_unregister_io_module);
925
926int dbg_io_get_char(void)
927{
928 int ret = dbg_io_ops->read_char();
929 if (ret == NO_POLL_CHAR)
930 return -1;
931 if (!dbg_kdb_mode)
932 return ret;
933 if (ret == 127)
934 return 8;
935 return ret;
936}
937
938/**
939 * kgdb_breakpoint - generate breakpoint exception
940 *
941 * This function will generate a breakpoint exception. It is used at the
942 * beginning of a program to sync up with a debugger and can be used
943 * otherwise as a quick means to stop program execution and "break" into
944 * the debugger.
945 */
946void kgdb_breakpoint(void)
947{
948 atomic_inc(&kgdb_setting_breakpoint);
949 wmb(); /* Sync point before breakpoint */
950 arch_kgdb_breakpoint();
951 wmb(); /* Sync point after breakpoint */
952 atomic_dec(&kgdb_setting_breakpoint);
953}
954EXPORT_SYMBOL_GPL(kgdb_breakpoint);
955
956static int __init opt_kgdb_wait(char *str)
957{
958 kgdb_break_asap = 1;
959
960 kdb_init(KDB_INIT_EARLY);
961 if (kgdb_io_module_registered)
962 kgdb_initial_breakpoint();
963
964 return 0;
965}
966
967early_param("kgdbwait", opt_kgdb_wait);
diff --git a/kernel/debug/debug_core.h b/kernel/debug/debug_core.h
new file mode 100644
index 000000000000..c5d753d80f67
--- /dev/null
+++ b/kernel/debug/debug_core.h
@@ -0,0 +1,81 @@
1/*
2 * Created by: Jason Wessel <jason.wessel@windriver.com>
3 *
4 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
5 *
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
9 */
10
11#ifndef _DEBUG_CORE_H_
12#define _DEBUG_CORE_H_
13/*
14 * These are the private implementation headers between the kernel
15 * debugger core and the debugger front end code.
16 */
17
18/* kernel debug core data structures */
19struct kgdb_state {
20 int ex_vector;
21 int signo;
22 int err_code;
23 int cpu;
24 int pass_exception;
25 unsigned long thr_query;
26 unsigned long threadid;
27 long kgdb_usethreadid;
28 struct pt_regs *linux_regs;
29};
30
31/* Exception state values */
32#define DCPU_WANT_MASTER 0x1 /* Waiting to become a master kgdb cpu */
33#define DCPU_NEXT_MASTER 0x2 /* Transition from one master cpu to another */
34#define DCPU_IS_SLAVE 0x4 /* Slave cpu enter exception */
35#define DCPU_SSTEP 0x8 /* CPU is single stepping */
36
37struct debuggerinfo_struct {
38 void *debuggerinfo;
39 struct task_struct *task;
40 int exception_state;
41 int ret_state;
42 int irq_depth;
43};
44
45extern struct debuggerinfo_struct kgdb_info[];
46
47/* kernel debug core break point routines */
48extern int dbg_remove_all_break(void);
49extern int dbg_set_sw_break(unsigned long addr);
50extern int dbg_remove_sw_break(unsigned long addr);
51extern int dbg_activate_sw_breakpoints(void);
52extern int dbg_deactivate_sw_breakpoints(void);
53
54/* polled character access to i/o module */
55extern int dbg_io_get_char(void);
56
57/* stub return value for switching between the gdbstub and kdb */
58#define DBG_PASS_EVENT -12345
59/* Switch from one cpu to another */
60#define DBG_SWITCH_CPU_EVENT -123456
61extern int dbg_switch_cpu;
62
63/* gdbstub interface functions */
64extern int gdb_serial_stub(struct kgdb_state *ks);
65extern void gdbstub_msg_write(const char *s, int len);
66
67/* gdbstub functions used for kdb <-> gdbstub transition */
68extern int gdbstub_state(struct kgdb_state *ks, char *cmd);
69extern int dbg_kdb_mode;
70
71#ifdef CONFIG_KGDB_KDB
72extern int kdb_stub(struct kgdb_state *ks);
73extern int kdb_parse(const char *cmdstr);
74#else /* ! CONFIG_KGDB_KDB */
75static inline int kdb_stub(struct kgdb_state *ks)
76{
77 return DBG_PASS_EVENT;
78}
79#endif /* CONFIG_KGDB_KDB */
80
81#endif /* _DEBUG_CORE_H_ */
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
new file mode 100644
index 000000000000..4b17b3269525
--- /dev/null
+++ b/kernel/debug/gdbstub.c
@@ -0,0 +1,1017 @@
1/*
2 * Kernel Debug Core
3 *
4 * Maintainer: Jason Wessel <jason.wessel@windriver.com>
5 *
6 * Copyright (C) 2000-2001 VERITAS Software Corporation.
7 * Copyright (C) 2002-2004 Timesys Corporation
8 * Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
9 * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
10 * Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
11 * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
12 * Copyright (C) 2005-2009 Wind River Systems, Inc.
13 * Copyright (C) 2007 MontaVista Software, Inc.
14 * Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
15 *
16 * Contributors at various stages not listed above:
17 * Jason Wessel ( jason.wessel@windriver.com )
18 * George Anzinger <george@mvista.com>
19 * Anurekh Saxena (anurekh.saxena@timesys.com)
20 * Lake Stevens Instrument Division (Glenn Engel)
21 * Jim Kingdon, Cygnus Support.
22 *
23 * Original KGDB stub: David Grothe <dave@gcom.com>,
24 * Tigran Aivazian <tigran@sco.com>
25 *
26 * This file is licensed under the terms of the GNU General Public License
27 * version 2. This program is licensed "as is" without any warranty of any
28 * kind, whether express or implied.
29 */
30
31#include <linux/kernel.h>
32#include <linux/kgdb.h>
33#include <linux/kdb.h>
34#include <linux/reboot.h>
35#include <linux/uaccess.h>
36#include <asm/cacheflush.h>
37#include <asm/unaligned.h>
38#include "debug_core.h"
39
40#define KGDB_MAX_THREAD_QUERY 17
41
42/* Our I/O buffers. */
43static char remcom_in_buffer[BUFMAX];
44static char remcom_out_buffer[BUFMAX];
45
46/* Storage for the registers, in GDB format. */
47static unsigned long gdb_regs[(NUMREGBYTES +
48 sizeof(unsigned long) - 1) /
49 sizeof(unsigned long)];
50
51/*
52 * GDB remote protocol parser:
53 */
54
55static int hex(char ch)
56{
57 if ((ch >= 'a') && (ch <= 'f'))
58 return ch - 'a' + 10;
59 if ((ch >= '0') && (ch <= '9'))
60 return ch - '0';
61 if ((ch >= 'A') && (ch <= 'F'))
62 return ch - 'A' + 10;
63 return -1;
64}
65
66#ifdef CONFIG_KGDB_KDB
67static int gdbstub_read_wait(void)
68{
69 int ret = -1;
70 int i;
71
72 /* poll any additional I/O interfaces that are defined */
73 while (ret < 0)
74 for (i = 0; kdb_poll_funcs[i] != NULL; i++) {
75 ret = kdb_poll_funcs[i]();
76 if (ret > 0)
77 break;
78 }
79 return ret;
80}
81#else
82static int gdbstub_read_wait(void)
83{
84 int ret = dbg_io_ops->read_char();
85 while (ret == NO_POLL_CHAR)
86 ret = dbg_io_ops->read_char();
87 return ret;
88}
89#endif
90/* scan for the sequence $<data>#<checksum> */
91static void get_packet(char *buffer)
92{
93 unsigned char checksum;
94 unsigned char xmitcsum;
95 int count;
96 char ch;
97
98 do {
99 /*
100 * Spin and wait around for the start character, ignore all
101 * other characters:
102 */
103 while ((ch = (gdbstub_read_wait())) != '$')
104 /* nothing */;
105
106 kgdb_connected = 1;
107 checksum = 0;
108 xmitcsum = -1;
109
110 count = 0;
111
112 /*
113 * now, read until a # or end of buffer is found:
114 */
115 while (count < (BUFMAX - 1)) {
116 ch = gdbstub_read_wait();
117 if (ch == '#')
118 break;
119 checksum = checksum + ch;
120 buffer[count] = ch;
121 count = count + 1;
122 }
123 buffer[count] = 0;
124
125 if (ch == '#') {
126 xmitcsum = hex(gdbstub_read_wait()) << 4;
127 xmitcsum += hex(gdbstub_read_wait());
128
129 if (checksum != xmitcsum)
130 /* failed checksum */
131 dbg_io_ops->write_char('-');
132 else
133 /* successful transfer */
134 dbg_io_ops->write_char('+');
135 if (dbg_io_ops->flush)
136 dbg_io_ops->flush();
137 }
138 } while (checksum != xmitcsum);
139}
140
141/*
142 * Send the packet in buffer.
143 * Check for gdb connection if asked for.
144 */
145static void put_packet(char *buffer)
146{
147 unsigned char checksum;
148 int count;
149 char ch;
150
151 /*
152 * $<packet info>#<checksum>.
153 */
154 while (1) {
155 dbg_io_ops->write_char('$');
156 checksum = 0;
157 count = 0;
158
159 while ((ch = buffer[count])) {
160 dbg_io_ops->write_char(ch);
161 checksum += ch;
162 count++;
163 }
164
165 dbg_io_ops->write_char('#');
166 dbg_io_ops->write_char(hex_asc_hi(checksum));
167 dbg_io_ops->write_char(hex_asc_lo(checksum));
168 if (dbg_io_ops->flush)
169 dbg_io_ops->flush();
170
171 /* Now see what we get in reply. */
172 ch = gdbstub_read_wait();
173
174 if (ch == 3)
175 ch = gdbstub_read_wait();
176
177 /* If we get an ACK, we are done. */
178 if (ch == '+')
179 return;
180
181 /*
182 * If we get the start of another packet, this means
183 * that GDB is attempting to reconnect. We will NAK
184 * the packet being sent, and stop trying to send this
185 * packet.
186 */
187 if (ch == '$') {
188 dbg_io_ops->write_char('-');
189 if (dbg_io_ops->flush)
190 dbg_io_ops->flush();
191 return;
192 }
193 }
194}
195
196static char gdbmsgbuf[BUFMAX + 1];
197
198void gdbstub_msg_write(const char *s, int len)
199{
200 char *bufptr;
201 int wcount;
202 int i;
203
204 if (len == 0)
205 len = strlen(s);
206
207 /* 'O'utput */
208 gdbmsgbuf[0] = 'O';
209
210 /* Fill and send buffers... */
211 while (len > 0) {
212 bufptr = gdbmsgbuf + 1;
213
214 /* Calculate how many this time */
215 if ((len << 1) > (BUFMAX - 2))
216 wcount = (BUFMAX - 2) >> 1;
217 else
218 wcount = len;
219
220 /* Pack in hex chars */
221 for (i = 0; i < wcount; i++)
222 bufptr = pack_hex_byte(bufptr, s[i]);
223 *bufptr = '\0';
224
225 /* Move up */
226 s += wcount;
227 len -= wcount;
228
229 /* Write packet */
230 put_packet(gdbmsgbuf);
231 }
232}
233
234/*
235 * Convert the memory pointed to by mem into hex, placing result in
236 * buf. Return a pointer to the last char put in buf (null). May
237 * return an error.
238 */
239int kgdb_mem2hex(char *mem, char *buf, int count)
240{
241 char *tmp;
242 int err;
243
244 /*
245 * We use the upper half of buf as an intermediate buffer for the
246 * raw memory copy. Hex conversion will work against this one.
247 */
248 tmp = buf + count;
249
250 err = probe_kernel_read(tmp, mem, count);
251 if (!err) {
252 while (count > 0) {
253 buf = pack_hex_byte(buf, *tmp);
254 tmp++;
255 count--;
256 }
257
258 *buf = 0;
259 }
260
261 return err;
262}
263
264/*
265 * Convert the hex array pointed to by buf into binary to be placed in
266 * mem. Return a pointer to the character AFTER the last byte
267 * written. May return an error.
268 */
269int kgdb_hex2mem(char *buf, char *mem, int count)
270{
271 char *tmp_raw;
272 char *tmp_hex;
273
274 /*
275 * We use the upper half of buf as an intermediate buffer for the
276 * raw memory that is converted from hex.
277 */
278 tmp_raw = buf + count * 2;
279
280 tmp_hex = tmp_raw - 1;
281 while (tmp_hex >= buf) {
282 tmp_raw--;
283 *tmp_raw = hex(*tmp_hex--);
284 *tmp_raw |= hex(*tmp_hex--) << 4;
285 }
286
287 return probe_kernel_write(mem, tmp_raw, count);
288}
289
290/*
291 * While we find nice hex chars, build a long_val.
292 * Return number of chars processed.
293 */
294int kgdb_hex2long(char **ptr, unsigned long *long_val)
295{
296 int hex_val;
297 int num = 0;
298 int negate = 0;
299
300 *long_val = 0;
301
302 if (**ptr == '-') {
303 negate = 1;
304 (*ptr)++;
305 }
306 while (**ptr) {
307 hex_val = hex(**ptr);
308 if (hex_val < 0)
309 break;
310
311 *long_val = (*long_val << 4) | hex_val;
312 num++;
313 (*ptr)++;
314 }
315
316 if (negate)
317 *long_val = -*long_val;
318
319 return num;
320}
321
322/*
323 * Copy the binary array pointed to by buf into mem. Fix $, #, and
324 * 0x7d escaped with 0x7d. Return -EFAULT on failure or 0 on success.
325 * The input buf is overwitten with the result to write to mem.
326 */
327static int kgdb_ebin2mem(char *buf, char *mem, int count)
328{
329 int size = 0;
330 char *c = buf;
331
332 while (count-- > 0) {
333 c[size] = *buf++;
334 if (c[size] == 0x7d)
335 c[size] = *buf++ ^ 0x20;
336 size++;
337 }
338
339 return probe_kernel_write(mem, c, size);
340}
341
342/* Write memory due to an 'M' or 'X' packet. */
343static int write_mem_msg(int binary)
344{
345 char *ptr = &remcom_in_buffer[1];
346 unsigned long addr;
347 unsigned long length;
348 int err;
349
350 if (kgdb_hex2long(&ptr, &addr) > 0 && *(ptr++) == ',' &&
351 kgdb_hex2long(&ptr, &length) > 0 && *(ptr++) == ':') {
352 if (binary)
353 err = kgdb_ebin2mem(ptr, (char *)addr, length);
354 else
355 err = kgdb_hex2mem(ptr, (char *)addr, length);
356 if (err)
357 return err;
358 if (CACHE_FLUSH_IS_SAFE)
359 flush_icache_range(addr, addr + length);
360 return 0;
361 }
362
363 return -EINVAL;
364}
365
366static void error_packet(char *pkt, int error)
367{
368 error = -error;
369 pkt[0] = 'E';
370 pkt[1] = hex_asc[(error / 10)];
371 pkt[2] = hex_asc[(error % 10)];
372 pkt[3] = '\0';
373}
374
375/*
376 * Thread ID accessors. We represent a flat TID space to GDB, where
377 * the per CPU idle threads (which under Linux all have PID 0) are
378 * remapped to negative TIDs.
379 */
380
381#define BUF_THREAD_ID_SIZE 16
382
383static char *pack_threadid(char *pkt, unsigned char *id)
384{
385 char *limit;
386
387 limit = pkt + BUF_THREAD_ID_SIZE;
388 while (pkt < limit)
389 pkt = pack_hex_byte(pkt, *id++);
390
391 return pkt;
392}
393
394static void int_to_threadref(unsigned char *id, int value)
395{
396 unsigned char *scan;
397 int i = 4;
398
399 scan = (unsigned char *)id;
400 while (i--)
401 *scan++ = 0;
402 put_unaligned_be32(value, scan);
403}
404
405static struct task_struct *getthread(struct pt_regs *regs, int tid)
406{
407 /*
408 * Non-positive TIDs are remapped to the cpu shadow information
409 */
410 if (tid == 0 || tid == -1)
411 tid = -atomic_read(&kgdb_active) - 2;
412 if (tid < -1 && tid > -NR_CPUS - 2) {
413 if (kgdb_info[-tid - 2].task)
414 return kgdb_info[-tid - 2].task;
415 else
416 return idle_task(-tid - 2);
417 }
418 if (tid <= 0) {
419 printk(KERN_ERR "KGDB: Internal thread select error\n");
420 dump_stack();
421 return NULL;
422 }
423
424 /*
425 * find_task_by_pid_ns() does not take the tasklist lock anymore
426 * but is nicely RCU locked - hence is a pretty resilient
427 * thing to use:
428 */
429 return find_task_by_pid_ns(tid, &init_pid_ns);
430}
431
432
433/*
434 * Remap normal tasks to their real PID,
435 * CPU shadow threads are mapped to -CPU - 2
436 */
437static inline int shadow_pid(int realpid)
438{
439 if (realpid)
440 return realpid;
441
442 return -raw_smp_processor_id() - 2;
443}
444
445/*
446 * All the functions that start with gdb_cmd are the various
447 * operations to implement the handlers for the gdbserial protocol
448 * where KGDB is communicating with an external debugger
449 */
450
451/* Handle the '?' status packets */
452static void gdb_cmd_status(struct kgdb_state *ks)
453{
454 /*
455 * We know that this packet is only sent
456 * during initial connect. So to be safe,
457 * we clear out our breakpoints now in case
458 * GDB is reconnecting.
459 */
460 dbg_remove_all_break();
461
462 remcom_out_buffer[0] = 'S';
463 pack_hex_byte(&remcom_out_buffer[1], ks->signo);
464}
465
466/* Handle the 'g' get registers request */
467static void gdb_cmd_getregs(struct kgdb_state *ks)
468{
469 struct task_struct *thread;
470 void *local_debuggerinfo;
471 int i;
472
473 thread = kgdb_usethread;
474 if (!thread) {
475 thread = kgdb_info[ks->cpu].task;
476 local_debuggerinfo = kgdb_info[ks->cpu].debuggerinfo;
477 } else {
478 local_debuggerinfo = NULL;
479 for_each_online_cpu(i) {
480 /*
481 * Try to find the task on some other
482 * or possibly this node if we do not
483 * find the matching task then we try
484 * to approximate the results.
485 */
486 if (thread == kgdb_info[i].task)
487 local_debuggerinfo = kgdb_info[i].debuggerinfo;
488 }
489 }
490
491 /*
492 * All threads that don't have debuggerinfo should be
493 * in schedule() sleeping, since all other CPUs
494 * are in kgdb_wait, and thus have debuggerinfo.
495 */
496 if (local_debuggerinfo) {
497 pt_regs_to_gdb_regs(gdb_regs, local_debuggerinfo);
498 } else {
499 /*
500 * Pull stuff saved during switch_to; nothing
501 * else is accessible (or even particularly
502 * relevant).
503 *
504 * This should be enough for a stack trace.
505 */
506 sleeping_thread_to_gdb_regs(gdb_regs, thread);
507 }
508 kgdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
509}
510
511/* Handle the 'G' set registers request */
512static void gdb_cmd_setregs(struct kgdb_state *ks)
513{
514 kgdb_hex2mem(&remcom_in_buffer[1], (char *)gdb_regs, NUMREGBYTES);
515
516 if (kgdb_usethread && kgdb_usethread != current) {
517 error_packet(remcom_out_buffer, -EINVAL);
518 } else {
519 gdb_regs_to_pt_regs(gdb_regs, ks->linux_regs);
520 strcpy(remcom_out_buffer, "OK");
521 }
522}
523
524/* Handle the 'm' memory read bytes */
525static void gdb_cmd_memread(struct kgdb_state *ks)
526{
527 char *ptr = &remcom_in_buffer[1];
528 unsigned long length;
529 unsigned long addr;
530 int err;
531
532 if (kgdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
533 kgdb_hex2long(&ptr, &length) > 0) {
534 err = kgdb_mem2hex((char *)addr, remcom_out_buffer, length);
535 if (err)
536 error_packet(remcom_out_buffer, err);
537 } else {
538 error_packet(remcom_out_buffer, -EINVAL);
539 }
540}
541
542/* Handle the 'M' memory write bytes */
543static void gdb_cmd_memwrite(struct kgdb_state *ks)
544{
545 int err = write_mem_msg(0);
546
547 if (err)
548 error_packet(remcom_out_buffer, err);
549 else
550 strcpy(remcom_out_buffer, "OK");
551}
552
553/* Handle the 'X' memory binary write bytes */
554static void gdb_cmd_binwrite(struct kgdb_state *ks)
555{
556 int err = write_mem_msg(1);
557
558 if (err)
559 error_packet(remcom_out_buffer, err);
560 else
561 strcpy(remcom_out_buffer, "OK");
562}
563
564/* Handle the 'D' or 'k', detach or kill packets */
565static void gdb_cmd_detachkill(struct kgdb_state *ks)
566{
567 int error;
568
569 /* The detach case */
570 if (remcom_in_buffer[0] == 'D') {
571 error = dbg_remove_all_break();
572 if (error < 0) {
573 error_packet(remcom_out_buffer, error);
574 } else {
575 strcpy(remcom_out_buffer, "OK");
576 kgdb_connected = 0;
577 }
578 put_packet(remcom_out_buffer);
579 } else {
580 /*
581 * Assume the kill case, with no exit code checking,
582 * trying to force detach the debugger:
583 */
584 dbg_remove_all_break();
585 kgdb_connected = 0;
586 }
587}
588
589/* Handle the 'R' reboot packets */
590static int gdb_cmd_reboot(struct kgdb_state *ks)
591{
592 /* For now, only honor R0 */
593 if (strcmp(remcom_in_buffer, "R0") == 0) {
594 printk(KERN_CRIT "Executing emergency reboot\n");
595 strcpy(remcom_out_buffer, "OK");
596 put_packet(remcom_out_buffer);
597
598 /*
599 * Execution should not return from
600 * machine_emergency_restart()
601 */
602 machine_emergency_restart();
603 kgdb_connected = 0;
604
605 return 1;
606 }
607 return 0;
608}
609
610/* Handle the 'q' query packets */
611static void gdb_cmd_query(struct kgdb_state *ks)
612{
613 struct task_struct *g;
614 struct task_struct *p;
615 unsigned char thref[8];
616 char *ptr;
617 int i;
618 int cpu;
619 int finished = 0;
620
621 switch (remcom_in_buffer[1]) {
622 case 's':
623 case 'f':
624 if (memcmp(remcom_in_buffer + 2, "ThreadInfo", 10)) {
625 error_packet(remcom_out_buffer, -EINVAL);
626 break;
627 }
628
629 i = 0;
630 remcom_out_buffer[0] = 'm';
631 ptr = remcom_out_buffer + 1;
632 if (remcom_in_buffer[1] == 'f') {
633 /* Each cpu is a shadow thread */
634 for_each_online_cpu(cpu) {
635 ks->thr_query = 0;
636 int_to_threadref(thref, -cpu - 2);
637 pack_threadid(ptr, thref);
638 ptr += BUF_THREAD_ID_SIZE;
639 *(ptr++) = ',';
640 i++;
641 }
642 }
643
644 do_each_thread(g, p) {
645 if (i >= ks->thr_query && !finished) {
646 int_to_threadref(thref, p->pid);
647 pack_threadid(ptr, thref);
648 ptr += BUF_THREAD_ID_SIZE;
649 *(ptr++) = ',';
650 ks->thr_query++;
651 if (ks->thr_query % KGDB_MAX_THREAD_QUERY == 0)
652 finished = 1;
653 }
654 i++;
655 } while_each_thread(g, p);
656
657 *(--ptr) = '\0';
658 break;
659
660 case 'C':
661 /* Current thread id */
662 strcpy(remcom_out_buffer, "QC");
663 ks->threadid = shadow_pid(current->pid);
664 int_to_threadref(thref, ks->threadid);
665 pack_threadid(remcom_out_buffer + 2, thref);
666 break;
667 case 'T':
668 if (memcmp(remcom_in_buffer + 1, "ThreadExtraInfo,", 16)) {
669 error_packet(remcom_out_buffer, -EINVAL);
670 break;
671 }
672 ks->threadid = 0;
673 ptr = remcom_in_buffer + 17;
674 kgdb_hex2long(&ptr, &ks->threadid);
675 if (!getthread(ks->linux_regs, ks->threadid)) {
676 error_packet(remcom_out_buffer, -EINVAL);
677 break;
678 }
679 if ((int)ks->threadid > 0) {
680 kgdb_mem2hex(getthread(ks->linux_regs,
681 ks->threadid)->comm,
682 remcom_out_buffer, 16);
683 } else {
684 static char tmpstr[23 + BUF_THREAD_ID_SIZE];
685
686 sprintf(tmpstr, "shadowCPU%d",
687 (int)(-ks->threadid - 2));
688 kgdb_mem2hex(tmpstr, remcom_out_buffer, strlen(tmpstr));
689 }
690 break;
691#ifdef CONFIG_KGDB_KDB
692 case 'R':
693 if (strncmp(remcom_in_buffer, "qRcmd,", 6) == 0) {
694 int len = strlen(remcom_in_buffer + 6);
695
696 if ((len % 2) != 0) {
697 strcpy(remcom_out_buffer, "E01");
698 break;
699 }
700 kgdb_hex2mem(remcom_in_buffer + 6,
701 remcom_out_buffer, len);
702 len = len / 2;
703 remcom_out_buffer[len++] = 0;
704
705 kdb_parse(remcom_out_buffer);
706 strcpy(remcom_out_buffer, "OK");
707 }
708 break;
709#endif
710 }
711}
712
713/* Handle the 'H' task query packets */
714static void gdb_cmd_task(struct kgdb_state *ks)
715{
716 struct task_struct *thread;
717 char *ptr;
718
719 switch (remcom_in_buffer[1]) {
720 case 'g':
721 ptr = &remcom_in_buffer[2];
722 kgdb_hex2long(&ptr, &ks->threadid);
723 thread = getthread(ks->linux_regs, ks->threadid);
724 if (!thread && ks->threadid > 0) {
725 error_packet(remcom_out_buffer, -EINVAL);
726 break;
727 }
728 kgdb_usethread = thread;
729 ks->kgdb_usethreadid = ks->threadid;
730 strcpy(remcom_out_buffer, "OK");
731 break;
732 case 'c':
733 ptr = &remcom_in_buffer[2];
734 kgdb_hex2long(&ptr, &ks->threadid);
735 if (!ks->threadid) {
736 kgdb_contthread = NULL;
737 } else {
738 thread = getthread(ks->linux_regs, ks->threadid);
739 if (!thread && ks->threadid > 0) {
740 error_packet(remcom_out_buffer, -EINVAL);
741 break;
742 }
743 kgdb_contthread = thread;
744 }
745 strcpy(remcom_out_buffer, "OK");
746 break;
747 }
748}
749
750/* Handle the 'T' thread query packets */
751static void gdb_cmd_thread(struct kgdb_state *ks)
752{
753 char *ptr = &remcom_in_buffer[1];
754 struct task_struct *thread;
755
756 kgdb_hex2long(&ptr, &ks->threadid);
757 thread = getthread(ks->linux_regs, ks->threadid);
758 if (thread)
759 strcpy(remcom_out_buffer, "OK");
760 else
761 error_packet(remcom_out_buffer, -EINVAL);
762}
763
764/* Handle the 'z' or 'Z' breakpoint remove or set packets */
765static void gdb_cmd_break(struct kgdb_state *ks)
766{
767 /*
768 * Since GDB-5.3, it's been drafted that '0' is a software
769 * breakpoint, '1' is a hardware breakpoint, so let's do that.
770 */
771 char *bpt_type = &remcom_in_buffer[1];
772 char *ptr = &remcom_in_buffer[2];
773 unsigned long addr;
774 unsigned long length;
775 int error = 0;
776
777 if (arch_kgdb_ops.set_hw_breakpoint && *bpt_type >= '1') {
778 /* Unsupported */
779 if (*bpt_type > '4')
780 return;
781 } else {
782 if (*bpt_type != '0' && *bpt_type != '1')
783 /* Unsupported. */
784 return;
785 }
786
787 /*
788 * Test if this is a hardware breakpoint, and
789 * if we support it:
790 */
791 if (*bpt_type == '1' && !(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT))
792 /* Unsupported. */
793 return;
794
795 if (*(ptr++) != ',') {
796 error_packet(remcom_out_buffer, -EINVAL);
797 return;
798 }
799 if (!kgdb_hex2long(&ptr, &addr)) {
800 error_packet(remcom_out_buffer, -EINVAL);
801 return;
802 }
803 if (*(ptr++) != ',' ||
804 !kgdb_hex2long(&ptr, &length)) {
805 error_packet(remcom_out_buffer, -EINVAL);
806 return;
807 }
808
809 if (remcom_in_buffer[0] == 'Z' && *bpt_type == '0')
810 error = dbg_set_sw_break(addr);
811 else if (remcom_in_buffer[0] == 'z' && *bpt_type == '0')
812 error = dbg_remove_sw_break(addr);
813 else if (remcom_in_buffer[0] == 'Z')
814 error = arch_kgdb_ops.set_hw_breakpoint(addr,
815 (int)length, *bpt_type - '0');
816 else if (remcom_in_buffer[0] == 'z')
817 error = arch_kgdb_ops.remove_hw_breakpoint(addr,
818 (int) length, *bpt_type - '0');
819
820 if (error == 0)
821 strcpy(remcom_out_buffer, "OK");
822 else
823 error_packet(remcom_out_buffer, error);
824}
825
826/* Handle the 'C' signal / exception passing packets */
827static int gdb_cmd_exception_pass(struct kgdb_state *ks)
828{
829 /* C09 == pass exception
830 * C15 == detach kgdb, pass exception
831 */
832 if (remcom_in_buffer[1] == '0' && remcom_in_buffer[2] == '9') {
833
834 ks->pass_exception = 1;
835 remcom_in_buffer[0] = 'c';
836
837 } else if (remcom_in_buffer[1] == '1' && remcom_in_buffer[2] == '5') {
838
839 ks->pass_exception = 1;
840 remcom_in_buffer[0] = 'D';
841 dbg_remove_all_break();
842 kgdb_connected = 0;
843 return 1;
844
845 } else {
846 gdbstub_msg_write("KGDB only knows signal 9 (pass)"
847 " and 15 (pass and disconnect)\n"
848 "Executing a continue without signal passing\n", 0);
849 remcom_in_buffer[0] = 'c';
850 }
851
852 /* Indicate fall through */
853 return -1;
854}
855
856/*
857 * This function performs all gdbserial command procesing
858 */
859int gdb_serial_stub(struct kgdb_state *ks)
860{
861 int error = 0;
862 int tmp;
863
864 /* Clear the out buffer. */
865 memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
866
867 if (kgdb_connected) {
868 unsigned char thref[8];
869 char *ptr;
870
871 /* Reply to host that an exception has occurred */
872 ptr = remcom_out_buffer;
873 *ptr++ = 'T';
874 ptr = pack_hex_byte(ptr, ks->signo);
875 ptr += strlen(strcpy(ptr, "thread:"));
876 int_to_threadref(thref, shadow_pid(current->pid));
877 ptr = pack_threadid(ptr, thref);
878 *ptr++ = ';';
879 put_packet(remcom_out_buffer);
880 }
881
882 kgdb_usethread = kgdb_info[ks->cpu].task;
883 ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
884 ks->pass_exception = 0;
885
886 while (1) {
887 error = 0;
888
889 /* Clear the out buffer. */
890 memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
891
892 get_packet(remcom_in_buffer);
893
894 switch (remcom_in_buffer[0]) {
895 case '?': /* gdbserial status */
896 gdb_cmd_status(ks);
897 break;
898 case 'g': /* return the value of the CPU registers */
899 gdb_cmd_getregs(ks);
900 break;
901 case 'G': /* set the value of the CPU registers - return OK */
902 gdb_cmd_setregs(ks);
903 break;
904 case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
905 gdb_cmd_memread(ks);
906 break;
907 case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA..AA */
908 gdb_cmd_memwrite(ks);
909 break;
910 case 'X': /* XAA..AA,LLLL: Write LLLL bytes at address AA..AA */
911 gdb_cmd_binwrite(ks);
912 break;
913 /* kill or detach. KGDB should treat this like a
914 * continue.
915 */
916 case 'D': /* Debugger detach */
917 case 'k': /* Debugger detach via kill */
918 gdb_cmd_detachkill(ks);
919 goto default_handle;
920 case 'R': /* Reboot */
921 if (gdb_cmd_reboot(ks))
922 goto default_handle;
923 break;
924 case 'q': /* query command */
925 gdb_cmd_query(ks);
926 break;
927 case 'H': /* task related */
928 gdb_cmd_task(ks);
929 break;
930 case 'T': /* Query thread status */
931 gdb_cmd_thread(ks);
932 break;
933 case 'z': /* Break point remove */
934 case 'Z': /* Break point set */
935 gdb_cmd_break(ks);
936 break;
937#ifdef CONFIG_KGDB_KDB
938 case '3': /* Escape into back into kdb */
939 if (remcom_in_buffer[1] == '\0') {
940 gdb_cmd_detachkill(ks);
941 return DBG_PASS_EVENT;
942 }
943#endif
944 case 'C': /* Exception passing */
945 tmp = gdb_cmd_exception_pass(ks);
946 if (tmp > 0)
947 goto default_handle;
948 if (tmp == 0)
949 break;
950 /* Fall through on tmp < 0 */
951 case 'c': /* Continue packet */
952 case 's': /* Single step packet */
953 if (kgdb_contthread && kgdb_contthread != current) {
954 /* Can't switch threads in kgdb */
955 error_packet(remcom_out_buffer, -EINVAL);
956 break;
957 }
958 dbg_activate_sw_breakpoints();
959 /* Fall through to default processing */
960 default:
961default_handle:
962 error = kgdb_arch_handle_exception(ks->ex_vector,
963 ks->signo,
964 ks->err_code,
965 remcom_in_buffer,
966 remcom_out_buffer,
967 ks->linux_regs);
968 /*
969 * Leave cmd processing on error, detach,
970 * kill, continue, or single step.
971 */
972 if (error >= 0 || remcom_in_buffer[0] == 'D' ||
973 remcom_in_buffer[0] == 'k') {
974 error = 0;
975 goto kgdb_exit;
976 }
977
978 }
979
980 /* reply to the request */
981 put_packet(remcom_out_buffer);
982 }
983
984kgdb_exit:
985 if (ks->pass_exception)
986 error = 1;
987 return error;
988}
989
990int gdbstub_state(struct kgdb_state *ks, char *cmd)
991{
992 int error;
993
994 switch (cmd[0]) {
995 case 'e':
996 error = kgdb_arch_handle_exception(ks->ex_vector,
997 ks->signo,
998 ks->err_code,
999 remcom_in_buffer,
1000 remcom_out_buffer,
1001 ks->linux_regs);
1002 return error;
1003 case 's':
1004 case 'c':
1005 strcpy(remcom_in_buffer, cmd);
1006 return 0;
1007 case '?':
1008 gdb_cmd_status(ks);
1009 break;
1010 case '\0':
1011 strcpy(remcom_out_buffer, "");
1012 break;
1013 }
1014 dbg_io_ops->write_char('+');
1015 put_packet(remcom_out_buffer);
1016 return 0;
1017}
diff --git a/kernel/debug/kdb/.gitignore b/kernel/debug/kdb/.gitignore
new file mode 100644
index 000000000000..396d12eda9e8
--- /dev/null
+++ b/kernel/debug/kdb/.gitignore
@@ -0,0 +1 @@
gen-kdb_cmds.c
diff --git a/kernel/debug/kdb/Makefile b/kernel/debug/kdb/Makefile
new file mode 100644
index 000000000000..d4fc58f4b88d
--- /dev/null
+++ b/kernel/debug/kdb/Makefile
@@ -0,0 +1,25 @@
1# This file is subject to the terms and conditions of the GNU General Public
2# License. See the file "COPYING" in the main directory of this archive
3# for more details.
4#
5# Copyright (c) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
6# Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
7#
8
9CCVERSION := $(shell $(CC) -v 2>&1 | sed -ne '$$p')
10obj-y := kdb_io.o kdb_main.o kdb_support.o kdb_bt.o gen-kdb_cmds.o kdb_bp.o kdb_debugger.o
11obj-$(CONFIG_KDB_KEYBOARD) += kdb_keyboard.o
12
13clean-files := gen-kdb_cmds.c
14
15quiet_cmd_gen-kdb = GENKDB $@
16 cmd_gen-kdb = $(AWK) 'BEGIN {print "\#include <linux/stddef.h>"; print "\#include <linux/init.h>"} \
17 /^\#/{next} \
18 /^[ \t]*$$/{next} \
19 {gsub(/"/, "\\\"", $$0); \
20 print "static __initdata char kdb_cmd" cmds++ "[] = \"" $$0 "\\n\";"} \
21 END {print "extern char *kdb_cmds[]; char __initdata *kdb_cmds[] = {"; for (i = 0; i < cmds; ++i) {print " kdb_cmd" i ","}; print(" NULL\n};");}' \
22 $(filter-out %/Makefile,$^) > $@#
23
24$(obj)/gen-kdb_cmds.c: $(src)/kdb_cmds $(src)/Makefile
25 $(call cmd,gen-kdb)
diff --git a/kernel/debug/kdb/kdb_bp.c b/kernel/debug/kdb/kdb_bp.c
new file mode 100644
index 000000000000..75bd9b3ebbb7
--- /dev/null
+++ b/kernel/debug/kdb/kdb_bp.c
@@ -0,0 +1,564 @@
1/*
2 * Kernel Debugger Architecture Independent Breakpoint Handler
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (c) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
10 */
11
12#include <linux/string.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/kdb.h>
16#include <linux/kgdb.h>
17#include <linux/smp.h>
18#include <linux/sched.h>
19#include <linux/interrupt.h>
20#include "kdb_private.h"
21
22/*
23 * Table of kdb_breakpoints
24 */
25kdb_bp_t kdb_breakpoints[KDB_MAXBPT];
26
27static void kdb_setsinglestep(struct pt_regs *regs)
28{
29 KDB_STATE_SET(DOING_SS);
30}
31
32static char *kdb_rwtypes[] = {
33 "Instruction(i)",
34 "Instruction(Register)",
35 "Data Write",
36 "I/O",
37 "Data Access"
38};
39
40static char *kdb_bptype(kdb_bp_t *bp)
41{
42 if (bp->bp_type < 0 || bp->bp_type > 4)
43 return "";
44
45 return kdb_rwtypes[bp->bp_type];
46}
47
48static int kdb_parsebp(int argc, const char **argv, int *nextargp, kdb_bp_t *bp)
49{
50 int nextarg = *nextargp;
51 int diag;
52
53 bp->bph_length = 1;
54 if ((argc + 1) != nextarg) {
55 if (strnicmp(argv[nextarg], "datar", sizeof("datar")) == 0)
56 bp->bp_type = BP_ACCESS_WATCHPOINT;
57 else if (strnicmp(argv[nextarg], "dataw", sizeof("dataw")) == 0)
58 bp->bp_type = BP_WRITE_WATCHPOINT;
59 else if (strnicmp(argv[nextarg], "inst", sizeof("inst")) == 0)
60 bp->bp_type = BP_HARDWARE_BREAKPOINT;
61 else
62 return KDB_ARGCOUNT;
63
64 bp->bph_length = 1;
65
66 nextarg++;
67
68 if ((argc + 1) != nextarg) {
69 unsigned long len;
70
71 diag = kdbgetularg((char *)argv[nextarg],
72 &len);
73 if (diag)
74 return diag;
75
76
77 if (len > 8)
78 return KDB_BADLENGTH;
79
80 bp->bph_length = len;
81 nextarg++;
82 }
83
84 if ((argc + 1) != nextarg)
85 return KDB_ARGCOUNT;
86 }
87
88 *nextargp = nextarg;
89 return 0;
90}
91
92static int _kdb_bp_remove(kdb_bp_t *bp)
93{
94 int ret = 1;
95 if (!bp->bp_installed)
96 return ret;
97 if (!bp->bp_type)
98 ret = dbg_remove_sw_break(bp->bp_addr);
99 else
100 ret = arch_kgdb_ops.remove_hw_breakpoint(bp->bp_addr,
101 bp->bph_length,
102 bp->bp_type);
103 if (ret == 0)
104 bp->bp_installed = 0;
105 return ret;
106}
107
108static void kdb_handle_bp(struct pt_regs *regs, kdb_bp_t *bp)
109{
110 if (KDB_DEBUG(BP))
111 kdb_printf("regs->ip = 0x%lx\n", instruction_pointer(regs));
112
113 /*
114 * Setup single step
115 */
116 kdb_setsinglestep(regs);
117
118 /*
119 * Reset delay attribute
120 */
121 bp->bp_delay = 0;
122 bp->bp_delayed = 1;
123}
124
125static int _kdb_bp_install(struct pt_regs *regs, kdb_bp_t *bp)
126{
127 int ret;
128 /*
129 * Install the breakpoint, if it is not already installed.
130 */
131
132 if (KDB_DEBUG(BP))
133 kdb_printf("%s: bp_installed %d\n",
134 __func__, bp->bp_installed);
135 if (!KDB_STATE(SSBPT))
136 bp->bp_delay = 0;
137 if (bp->bp_installed)
138 return 1;
139 if (bp->bp_delay || (bp->bp_delayed && KDB_STATE(DOING_SS))) {
140 if (KDB_DEBUG(BP))
141 kdb_printf("%s: delayed bp\n", __func__);
142 kdb_handle_bp(regs, bp);
143 return 0;
144 }
145 if (!bp->bp_type)
146 ret = dbg_set_sw_break(bp->bp_addr);
147 else
148 ret = arch_kgdb_ops.set_hw_breakpoint(bp->bp_addr,
149 bp->bph_length,
150 bp->bp_type);
151 if (ret == 0) {
152 bp->bp_installed = 1;
153 } else {
154 kdb_printf("%s: failed to set breakpoint at 0x%lx\n",
155 __func__, bp->bp_addr);
156 return 1;
157 }
158 return 0;
159}
160
161/*
162 * kdb_bp_install
163 *
164 * Install kdb_breakpoints prior to returning from the
165 * kernel debugger. This allows the kdb_breakpoints to be set
166 * upon functions that are used internally by kdb, such as
167 * printk(). This function is only called once per kdb session.
168 */
169void kdb_bp_install(struct pt_regs *regs)
170{
171 int i;
172
173 for (i = 0; i < KDB_MAXBPT; i++) {
174 kdb_bp_t *bp = &kdb_breakpoints[i];
175
176 if (KDB_DEBUG(BP)) {
177 kdb_printf("%s: bp %d bp_enabled %d\n",
178 __func__, i, bp->bp_enabled);
179 }
180 if (bp->bp_enabled)
181 _kdb_bp_install(regs, bp);
182 }
183}
184
185/*
186 * kdb_bp_remove
187 *
188 * Remove kdb_breakpoints upon entry to the kernel debugger.
189 *
190 * Parameters:
191 * None.
192 * Outputs:
193 * None.
194 * Returns:
195 * None.
196 * Locking:
197 * None.
198 * Remarks:
199 */
200void kdb_bp_remove(void)
201{
202 int i;
203
204 for (i = KDB_MAXBPT - 1; i >= 0; i--) {
205 kdb_bp_t *bp = &kdb_breakpoints[i];
206
207 if (KDB_DEBUG(BP)) {
208 kdb_printf("%s: bp %d bp_enabled %d\n",
209 __func__, i, bp->bp_enabled);
210 }
211 if (bp->bp_enabled)
212 _kdb_bp_remove(bp);
213 }
214}
215
216
217/*
218 * kdb_printbp
219 *
220 * Internal function to format and print a breakpoint entry.
221 *
222 * Parameters:
223 * None.
224 * Outputs:
225 * None.
226 * Returns:
227 * None.
228 * Locking:
229 * None.
230 * Remarks:
231 */
232
233static void kdb_printbp(kdb_bp_t *bp, int i)
234{
235 kdb_printf("%s ", kdb_bptype(bp));
236 kdb_printf("BP #%d at ", i);
237 kdb_symbol_print(bp->bp_addr, NULL, KDB_SP_DEFAULT);
238
239 if (bp->bp_enabled)
240 kdb_printf("\n is enabled");
241 else
242 kdb_printf("\n is disabled");
243
244 kdb_printf("\taddr at %016lx, hardtype=%d installed=%d\n",
245 bp->bp_addr, bp->bp_type, bp->bp_installed);
246
247 kdb_printf("\n");
248}
249
250/*
251 * kdb_bp
252 *
253 * Handle the bp commands.
254 *
255 * [bp|bph] <addr-expression> [DATAR|DATAW]
256 *
257 * Parameters:
258 * argc Count of arguments in argv
259 * argv Space delimited command line arguments
260 * Outputs:
261 * None.
262 * Returns:
263 * Zero for success, a kdb diagnostic if failure.
264 * Locking:
265 * None.
266 * Remarks:
267 *
268 * bp Set breakpoint on all cpus. Only use hardware assist if need.
269 * bph Set breakpoint on all cpus. Force hardware register
270 */
271
272static int kdb_bp(int argc, const char **argv)
273{
274 int i, bpno;
275 kdb_bp_t *bp, *bp_check;
276 int diag;
277 int free;
278 char *symname = NULL;
279 long offset = 0ul;
280 int nextarg;
281 kdb_bp_t template = {0};
282
283 if (argc == 0) {
284 /*
285 * Display breakpoint table
286 */
287 for (bpno = 0, bp = kdb_breakpoints; bpno < KDB_MAXBPT;
288 bpno++, bp++) {
289 if (bp->bp_free)
290 continue;
291 kdb_printbp(bp, bpno);
292 }
293
294 return 0;
295 }
296
297 nextarg = 1;
298 diag = kdbgetaddrarg(argc, argv, &nextarg, &template.bp_addr,
299 &offset, &symname);
300 if (diag)
301 return diag;
302 if (!template.bp_addr)
303 return KDB_BADINT;
304
305 /*
306 * Find an empty bp structure to allocate
307 */
308 free = KDB_MAXBPT;
309 for (bpno = 0, bp = kdb_breakpoints; bpno < KDB_MAXBPT; bpno++, bp++) {
310 if (bp->bp_free)
311 break;
312 }
313
314 if (bpno == KDB_MAXBPT)
315 return KDB_TOOMANYBPT;
316
317 if (strcmp(argv[0], "bph") == 0) {
318 template.bp_type = BP_HARDWARE_BREAKPOINT;
319 diag = kdb_parsebp(argc, argv, &nextarg, &template);
320 if (diag)
321 return diag;
322 } else {
323 template.bp_type = BP_BREAKPOINT;
324 }
325
326 /*
327 * Check for clashing breakpoints.
328 *
329 * Note, in this design we can't have hardware breakpoints
330 * enabled for both read and write on the same address.
331 */
332 for (i = 0, bp_check = kdb_breakpoints; i < KDB_MAXBPT;
333 i++, bp_check++) {
334 if (!bp_check->bp_free &&
335 bp_check->bp_addr == template.bp_addr) {
336 kdb_printf("You already have a breakpoint at "
337 kdb_bfd_vma_fmt0 "\n", template.bp_addr);
338 return KDB_DUPBPT;
339 }
340 }
341
342 template.bp_enabled = 1;
343
344 /*
345 * Actually allocate the breakpoint found earlier
346 */
347 *bp = template;
348 bp->bp_free = 0;
349
350 kdb_printbp(bp, bpno);
351
352 return 0;
353}
354
355/*
356 * kdb_bc
357 *
358 * Handles the 'bc', 'be', and 'bd' commands
359 *
360 * [bd|bc|be] <breakpoint-number>
361 * [bd|bc|be] *
362 *
363 * Parameters:
364 * argc Count of arguments in argv
365 * argv Space delimited command line arguments
366 * Outputs:
367 * None.
368 * Returns:
369 * Zero for success, a kdb diagnostic for failure
370 * Locking:
371 * None.
372 * Remarks:
373 */
374static int kdb_bc(int argc, const char **argv)
375{
376 unsigned long addr;
377 kdb_bp_t *bp = NULL;
378 int lowbp = KDB_MAXBPT;
379 int highbp = 0;
380 int done = 0;
381 int i;
382 int diag = 0;
383
384 int cmd; /* KDBCMD_B? */
385#define KDBCMD_BC 0
386#define KDBCMD_BE 1
387#define KDBCMD_BD 2
388
389 if (strcmp(argv[0], "be") == 0)
390 cmd = KDBCMD_BE;
391 else if (strcmp(argv[0], "bd") == 0)
392 cmd = KDBCMD_BD;
393 else
394 cmd = KDBCMD_BC;
395
396 if (argc != 1)
397 return KDB_ARGCOUNT;
398
399 if (strcmp(argv[1], "*") == 0) {
400 lowbp = 0;
401 highbp = KDB_MAXBPT;
402 } else {
403 diag = kdbgetularg(argv[1], &addr);
404 if (diag)
405 return diag;
406
407 /*
408 * For addresses less than the maximum breakpoint number,
409 * assume that the breakpoint number is desired.
410 */
411 if (addr < KDB_MAXBPT) {
412 bp = &kdb_breakpoints[addr];
413 lowbp = highbp = addr;
414 highbp++;
415 } else {
416 for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT;
417 i++, bp++) {
418 if (bp->bp_addr == addr) {
419 lowbp = highbp = i;
420 highbp++;
421 break;
422 }
423 }
424 }
425 }
426
427 /*
428 * Now operate on the set of breakpoints matching the input
429 * criteria (either '*' for all, or an individual breakpoint).
430 */
431 for (bp = &kdb_breakpoints[lowbp], i = lowbp;
432 i < highbp;
433 i++, bp++) {
434 if (bp->bp_free)
435 continue;
436
437 done++;
438
439 switch (cmd) {
440 case KDBCMD_BC:
441 bp->bp_enabled = 0;
442
443 kdb_printf("Breakpoint %d at "
444 kdb_bfd_vma_fmt " cleared\n",
445 i, bp->bp_addr);
446
447 bp->bp_addr = 0;
448 bp->bp_free = 1;
449
450 break;
451 case KDBCMD_BE:
452 bp->bp_enabled = 1;
453
454 kdb_printf("Breakpoint %d at "
455 kdb_bfd_vma_fmt " enabled",
456 i, bp->bp_addr);
457
458 kdb_printf("\n");
459 break;
460 case KDBCMD_BD:
461 if (!bp->bp_enabled)
462 break;
463
464 bp->bp_enabled = 0;
465
466 kdb_printf("Breakpoint %d at "
467 kdb_bfd_vma_fmt " disabled\n",
468 i, bp->bp_addr);
469
470 break;
471 }
472 if (bp->bp_delay && (cmd == KDBCMD_BC || cmd == KDBCMD_BD)) {
473 bp->bp_delay = 0;
474 KDB_STATE_CLEAR(SSBPT);
475 }
476 }
477
478 return (!done) ? KDB_BPTNOTFOUND : 0;
479}
480
481/*
482 * kdb_ss
483 *
484 * Process the 'ss' (Single Step) and 'ssb' (Single Step to Branch)
485 * commands.
486 *
487 * ss
488 * ssb
489 *
490 * Parameters:
491 * argc Argument count
492 * argv Argument vector
493 * Outputs:
494 * None.
495 * Returns:
496 * KDB_CMD_SS[B] for success, a kdb error if failure.
497 * Locking:
498 * None.
499 * Remarks:
500 *
501 * Set the arch specific option to trigger a debug trap after the next
502 * instruction.
503 *
504 * For 'ssb', set the trace flag in the debug trap handler
505 * after printing the current insn and return directly without
506 * invoking the kdb command processor, until a branch instruction
507 * is encountered.
508 */
509
510static int kdb_ss(int argc, const char **argv)
511{
512 int ssb = 0;
513
514 ssb = (strcmp(argv[0], "ssb") == 0);
515 if (argc != 0)
516 return KDB_ARGCOUNT;
517 /*
518 * Set trace flag and go.
519 */
520 KDB_STATE_SET(DOING_SS);
521 if (ssb) {
522 KDB_STATE_SET(DOING_SSB);
523 return KDB_CMD_SSB;
524 }
525 return KDB_CMD_SS;
526}
527
528/* Initialize the breakpoint table and register breakpoint commands. */
529
530void __init kdb_initbptab(void)
531{
532 int i;
533 kdb_bp_t *bp;
534
535 /*
536 * First time initialization.
537 */
538 memset(&kdb_breakpoints, '\0', sizeof(kdb_breakpoints));
539
540 for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++)
541 bp->bp_free = 1;
542
543 kdb_register_repeat("bp", kdb_bp, "[<vaddr>]",
544 "Set/Display breakpoints", 0, KDB_REPEAT_NO_ARGS);
545 kdb_register_repeat("bl", kdb_bp, "[<vaddr>]",
546 "Display breakpoints", 0, KDB_REPEAT_NO_ARGS);
547 if (arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT)
548 kdb_register_repeat("bph", kdb_bp, "[<vaddr>]",
549 "[datar [length]|dataw [length]] Set hw brk", 0, KDB_REPEAT_NO_ARGS);
550 kdb_register_repeat("bc", kdb_bc, "<bpnum>",
551 "Clear Breakpoint", 0, KDB_REPEAT_NONE);
552 kdb_register_repeat("be", kdb_bc, "<bpnum>",
553 "Enable Breakpoint", 0, KDB_REPEAT_NONE);
554 kdb_register_repeat("bd", kdb_bc, "<bpnum>",
555 "Disable Breakpoint", 0, KDB_REPEAT_NONE);
556
557 kdb_register_repeat("ss", kdb_ss, "",
558 "Single Step", 1, KDB_REPEAT_NO_ARGS);
559 kdb_register_repeat("ssb", kdb_ss, "",
560 "Single step to branch/call", 0, KDB_REPEAT_NO_ARGS);
561 /*
562 * Architecture dependent initialization.
563 */
564}
diff --git a/kernel/debug/kdb/kdb_bt.c b/kernel/debug/kdb/kdb_bt.c
new file mode 100644
index 000000000000..2f62fe85f16a
--- /dev/null
+++ b/kernel/debug/kdb/kdb_bt.c
@@ -0,0 +1,210 @@
1/*
2 * Kernel Debugger Architecture Independent Stack Traceback
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (c) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
10 */
11
12#include <linux/ctype.h>
13#include <linux/string.h>
14#include <linux/kernel.h>
15#include <linux/sched.h>
16#include <linux/kdb.h>
17#include <linux/nmi.h>
18#include <asm/system.h>
19#include "kdb_private.h"
20
21
22static void kdb_show_stack(struct task_struct *p, void *addr)
23{
24 int old_lvl = console_loglevel;
25 console_loglevel = 15;
26 kdb_trap_printk++;
27 kdb_set_current_task(p);
28 if (addr) {
29 show_stack((struct task_struct *)p, addr);
30 } else if (kdb_current_regs) {
31#ifdef CONFIG_X86
32 show_stack(p, &kdb_current_regs->sp);
33#else
34 show_stack(p, NULL);
35#endif
36 } else {
37 show_stack(p, NULL);
38 }
39 console_loglevel = old_lvl;
40 kdb_trap_printk--;
41}
42
43/*
44 * kdb_bt
45 *
46 * This function implements the 'bt' command. Print a stack
47 * traceback.
48 *
49 * bt [<address-expression>] (addr-exp is for alternate stacks)
50 * btp <pid> Kernel stack for <pid>
51 * btt <address-expression> Kernel stack for task structure at
52 * <address-expression>
53 * bta [DRSTCZEUIMA] All useful processes, optionally
54 * filtered by state
55 * btc [<cpu>] The current process on one cpu,
56 * default is all cpus
57 *
58 * bt <address-expression> refers to a address on the stack, that location
59 * is assumed to contain a return address.
60 *
61 * btt <address-expression> refers to the address of a struct task.
62 *
63 * Inputs:
64 * argc argument count
65 * argv argument vector
66 * Outputs:
67 * None.
68 * Returns:
69 * zero for success, a kdb diagnostic if error
70 * Locking:
71 * none.
72 * Remarks:
73 * Backtrack works best when the code uses frame pointers. But even
74 * without frame pointers we should get a reasonable trace.
75 *
76 * mds comes in handy when examining the stack to do a manual traceback or
77 * to get a starting point for bt <address-expression>.
78 */
79
80static int
81kdb_bt1(struct task_struct *p, unsigned long mask,
82 int argcount, int btaprompt)
83{
84 char buffer[2];
85 if (kdb_getarea(buffer[0], (unsigned long)p) ||
86 kdb_getarea(buffer[0], (unsigned long)(p+1)-1))
87 return KDB_BADADDR;
88 if (!kdb_task_state(p, mask))
89 return 0;
90 kdb_printf("Stack traceback for pid %d\n", p->pid);
91 kdb_ps1(p);
92 kdb_show_stack(p, NULL);
93 if (btaprompt) {
94 kdb_getstr(buffer, sizeof(buffer),
95 "Enter <q> to end, <cr> to continue:");
96 if (buffer[0] == 'q') {
97 kdb_printf("\n");
98 return 1;
99 }
100 }
101 touch_nmi_watchdog();
102 return 0;
103}
104
105int
106kdb_bt(int argc, const char **argv)
107{
108 int diag;
109 int argcount = 5;
110 int btaprompt = 1;
111 int nextarg;
112 unsigned long addr;
113 long offset;
114
115 kdbgetintenv("BTARGS", &argcount); /* Arguments to print */
116 kdbgetintenv("BTAPROMPT", &btaprompt); /* Prompt after each
117 * proc in bta */
118
119 if (strcmp(argv[0], "bta") == 0) {
120 struct task_struct *g, *p;
121 unsigned long cpu;
122 unsigned long mask = kdb_task_state_string(argc ? argv[1] :
123 NULL);
124 if (argc == 0)
125 kdb_ps_suppressed();
126 /* Run the active tasks first */
127 for_each_online_cpu(cpu) {
128 p = kdb_curr_task(cpu);
129 if (kdb_bt1(p, mask, argcount, btaprompt))
130 return 0;
131 }
132 /* Now the inactive tasks */
133 kdb_do_each_thread(g, p) {
134 if (task_curr(p))
135 continue;
136 if (kdb_bt1(p, mask, argcount, btaprompt))
137 return 0;
138 } kdb_while_each_thread(g, p);
139 } else if (strcmp(argv[0], "btp") == 0) {
140 struct task_struct *p;
141 unsigned long pid;
142 if (argc != 1)
143 return KDB_ARGCOUNT;
144 diag = kdbgetularg((char *)argv[1], &pid);
145 if (diag)
146 return diag;
147 p = find_task_by_pid_ns(pid, &init_pid_ns);
148 if (p) {
149 kdb_set_current_task(p);
150 return kdb_bt1(p, ~0UL, argcount, 0);
151 }
152 kdb_printf("No process with pid == %ld found\n", pid);
153 return 0;
154 } else if (strcmp(argv[0], "btt") == 0) {
155 if (argc != 1)
156 return KDB_ARGCOUNT;
157 diag = kdbgetularg((char *)argv[1], &addr);
158 if (diag)
159 return diag;
160 kdb_set_current_task((struct task_struct *)addr);
161 return kdb_bt1((struct task_struct *)addr, ~0UL, argcount, 0);
162 } else if (strcmp(argv[0], "btc") == 0) {
163 unsigned long cpu = ~0;
164 struct task_struct *save_current_task = kdb_current_task;
165 char buf[80];
166 if (argc > 1)
167 return KDB_ARGCOUNT;
168 if (argc == 1) {
169 diag = kdbgetularg((char *)argv[1], &cpu);
170 if (diag)
171 return diag;
172 }
173 /* Recursive use of kdb_parse, do not use argv after
174 * this point */
175 argv = NULL;
176 if (cpu != ~0) {
177 if (cpu >= num_possible_cpus() || !cpu_online(cpu)) {
178 kdb_printf("no process for cpu %ld\n", cpu);
179 return 0;
180 }
181 sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));
182 kdb_parse(buf);
183 return 0;
184 }
185 kdb_printf("btc: cpu status: ");
186 kdb_parse("cpu\n");
187 for_each_online_cpu(cpu) {
188 sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));
189 kdb_parse(buf);
190 touch_nmi_watchdog();
191 }
192 kdb_set_current_task(save_current_task);
193 return 0;
194 } else {
195 if (argc) {
196 nextarg = 1;
197 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
198 &offset, NULL);
199 if (diag)
200 return diag;
201 kdb_show_stack(kdb_current_task, (void *)addr);
202 return 0;
203 } else {
204 return kdb_bt1(kdb_current_task, ~0UL, argcount, 0);
205 }
206 }
207
208 /* NOTREACHED */
209 return 0;
210}
diff --git a/kernel/debug/kdb/kdb_cmds b/kernel/debug/kdb/kdb_cmds
new file mode 100644
index 000000000000..56c88e4db309
--- /dev/null
+++ b/kernel/debug/kdb/kdb_cmds
@@ -0,0 +1,35 @@
1# Initial commands for kdb, alter to suit your needs.
2# These commands are executed in kdb_init() context, no SMP, no
3# processes. Commands that require process data (including stack or
4# registers) are not reliable this early. set and bp commands should
5# be safe. Global breakpoint commands affect each cpu as it is booted.
6
7# Standard debugging information for first level support, just type archkdb
8# or archkdbcpu or archkdbshort at the kdb prompt.
9
10defcmd dumpcommon "" "Common kdb debugging"
11 set BTAPROMPT 0
12 set LINES 10000
13 -summary
14 -cpu
15 -ps
16 -dmesg 600
17 -bt
18endefcmd
19
20defcmd dumpall "" "First line debugging"
21 set BTSYMARG 1
22 set BTARGS 9
23 pid R
24 -dumpcommon
25 -bta
26endefcmd
27
28defcmd dumpcpu "" "Same as dumpall but only tasks on cpus"
29 set BTSYMARG 1
30 set BTARGS 9
31 pid R
32 -dumpcommon
33 -btc
34endefcmd
35
diff --git a/kernel/debug/kdb/kdb_debugger.c b/kernel/debug/kdb/kdb_debugger.c
new file mode 100644
index 000000000000..bf6e8270e957
--- /dev/null
+++ b/kernel/debug/kdb/kdb_debugger.c
@@ -0,0 +1,169 @@
1/*
2 * Created by: Jason Wessel <jason.wessel@windriver.com>
3 *
4 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
5 *
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
9 */
10
11#include <linux/kgdb.h>
12#include <linux/kdb.h>
13#include <linux/kdebug.h>
14#include "kdb_private.h"
15#include "../debug_core.h"
16
17/*
18 * KDB interface to KGDB internals
19 */
20get_char_func kdb_poll_funcs[] = {
21 dbg_io_get_char,
22 NULL,
23 NULL,
24 NULL,
25 NULL,
26 NULL,
27};
28EXPORT_SYMBOL_GPL(kdb_poll_funcs);
29
30int kdb_poll_idx = 1;
31EXPORT_SYMBOL_GPL(kdb_poll_idx);
32
33int kdb_stub(struct kgdb_state *ks)
34{
35 int error = 0;
36 kdb_bp_t *bp;
37 unsigned long addr = kgdb_arch_pc(ks->ex_vector, ks->linux_regs);
38 kdb_reason_t reason = KDB_REASON_OOPS;
39 kdb_dbtrap_t db_result = KDB_DB_NOBPT;
40 int i;
41
42 if (KDB_STATE(REENTRY)) {
43 reason = KDB_REASON_SWITCH;
44 KDB_STATE_CLEAR(REENTRY);
45 addr = instruction_pointer(ks->linux_regs);
46 }
47 ks->pass_exception = 0;
48 if (atomic_read(&kgdb_setting_breakpoint))
49 reason = KDB_REASON_KEYBOARD;
50
51 for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) {
52 if ((bp->bp_enabled) && (bp->bp_addr == addr)) {
53 reason = KDB_REASON_BREAK;
54 db_result = KDB_DB_BPT;
55 if (addr != instruction_pointer(ks->linux_regs))
56 kgdb_arch_set_pc(ks->linux_regs, addr);
57 break;
58 }
59 }
60 if (reason == KDB_REASON_BREAK || reason == KDB_REASON_SWITCH) {
61 for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) {
62 if (bp->bp_free)
63 continue;
64 if (bp->bp_addr == addr) {
65 bp->bp_delay = 1;
66 bp->bp_delayed = 1;
67 /*
68 * SSBPT is set when the kernel debugger must single step a
69 * task in order to re-establish an instruction breakpoint
70 * which uses the instruction replacement mechanism. It is
71 * cleared by any action that removes the need to single-step
72 * the breakpoint.
73 */
74 reason = KDB_REASON_BREAK;
75 db_result = KDB_DB_BPT;
76 KDB_STATE_SET(SSBPT);
77 break;
78 }
79 }
80 }
81
82 if (reason != KDB_REASON_BREAK && ks->ex_vector == 0 &&
83 ks->signo == SIGTRAP) {
84 reason = KDB_REASON_SSTEP;
85 db_result = KDB_DB_BPT;
86 }
87 /* Set initial kdb state variables */
88 KDB_STATE_CLEAR(KGDB_TRANS);
89 kdb_initial_cpu = ks->cpu;
90 kdb_current_task = kgdb_info[ks->cpu].task;
91 kdb_current_regs = kgdb_info[ks->cpu].debuggerinfo;
92 /* Remove any breakpoints as needed by kdb and clear single step */
93 kdb_bp_remove();
94 KDB_STATE_CLEAR(DOING_SS);
95 KDB_STATE_CLEAR(DOING_SSB);
96 KDB_STATE_SET(PAGER);
97 /* zero out any offline cpu data */
98 for_each_present_cpu(i) {
99 if (!cpu_online(i)) {
100 kgdb_info[i].debuggerinfo = NULL;
101 kgdb_info[i].task = NULL;
102 }
103 }
104 if (ks->err_code == DIE_OOPS || reason == KDB_REASON_OOPS) {
105 ks->pass_exception = 1;
106 KDB_FLAG_SET(CATASTROPHIC);
107 }
108 kdb_initial_cpu = ks->cpu;
109 if (KDB_STATE(SSBPT) && reason == KDB_REASON_SSTEP) {
110 KDB_STATE_CLEAR(SSBPT);
111 KDB_STATE_CLEAR(DOING_SS);
112 } else {
113 /* Start kdb main loop */
114 error = kdb_main_loop(KDB_REASON_ENTER, reason,
115 ks->err_code, db_result, ks->linux_regs);
116 }
117 /*
118 * Upon exit from the kdb main loop setup break points and restart
119 * the system based on the requested continue state
120 */
121 kdb_initial_cpu = -1;
122 kdb_current_task = NULL;
123 kdb_current_regs = NULL;
124 KDB_STATE_CLEAR(PAGER);
125 kdbnearsym_cleanup();
126 if (error == KDB_CMD_KGDB) {
127 if (KDB_STATE(DOING_KGDB) || KDB_STATE(DOING_KGDB2)) {
128 /*
129 * This inteface glue which allows kdb to transition in into
130 * the gdb stub. In order to do this the '?' or '' gdb serial
131 * packet response is processed here. And then control is
132 * passed to the gdbstub.
133 */
134 if (KDB_STATE(DOING_KGDB))
135 gdbstub_state(ks, "?");
136 else
137 gdbstub_state(ks, "");
138 KDB_STATE_CLEAR(DOING_KGDB);
139 KDB_STATE_CLEAR(DOING_KGDB2);
140 }
141 return DBG_PASS_EVENT;
142 }
143 kdb_bp_install(ks->linux_regs);
144 dbg_activate_sw_breakpoints();
145 /* Set the exit state to a single step or a continue */
146 if (KDB_STATE(DOING_SS))
147 gdbstub_state(ks, "s");
148 else
149 gdbstub_state(ks, "c");
150
151 KDB_FLAG_CLEAR(CATASTROPHIC);
152
153 /* Invoke arch specific exception handling prior to system resume */
154 kgdb_info[ks->cpu].ret_state = gdbstub_state(ks, "e");
155 if (ks->pass_exception)
156 kgdb_info[ks->cpu].ret_state = 1;
157 if (error == KDB_CMD_CPU) {
158 KDB_STATE_SET(REENTRY);
159 /*
160 * Force clear the single step bit because kdb emulates this
161 * differently vs the gdbstub
162 */
163 kgdb_single_step = 0;
164 dbg_deactivate_sw_breakpoints();
165 return DBG_SWITCH_CPU_EVENT;
166 }
167 return kgdb_info[ks->cpu].ret_state;
168}
169
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
new file mode 100644
index 000000000000..c9b7f4f90bba
--- /dev/null
+++ b/kernel/debug/kdb/kdb_io.c
@@ -0,0 +1,826 @@
1/*
2 * Kernel Debugger Architecture Independent Console I/O handler
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
10 */
11
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/ctype.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/kdev_t.h>
18#include <linux/console.h>
19#include <linux/string.h>
20#include <linux/sched.h>
21#include <linux/smp.h>
22#include <linux/nmi.h>
23#include <linux/delay.h>
24#include <linux/kgdb.h>
25#include <linux/kdb.h>
26#include <linux/kallsyms.h>
27#include "kdb_private.h"
28
29#define CMD_BUFLEN 256
30char kdb_prompt_str[CMD_BUFLEN];
31
32int kdb_trap_printk;
33
34static void kgdb_transition_check(char *buffer)
35{
36 int slen = strlen(buffer);
37 if (strncmp(buffer, "$?#3f", slen) != 0 &&
38 strncmp(buffer, "$qSupported#37", slen) != 0 &&
39 strncmp(buffer, "+$qSupported#37", slen) != 0) {
40 KDB_STATE_SET(KGDB_TRANS);
41 kdb_printf("%s", buffer);
42 }
43}
44
45static int kdb_read_get_key(char *buffer, size_t bufsize)
46{
47#define ESCAPE_UDELAY 1000
48#define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */
49 char escape_data[5]; /* longest vt100 escape sequence is 4 bytes */
50 char *ped = escape_data;
51 int escape_delay = 0;
52 get_char_func *f, *f_escape = NULL;
53 int key;
54
55 for (f = &kdb_poll_funcs[0]; ; ++f) {
56 if (*f == NULL) {
57 /* Reset NMI watchdog once per poll loop */
58 touch_nmi_watchdog();
59 f = &kdb_poll_funcs[0];
60 }
61 if (escape_delay == 2) {
62 *ped = '\0';
63 ped = escape_data;
64 --escape_delay;
65 }
66 if (escape_delay == 1) {
67 key = *ped++;
68 if (!*ped)
69 --escape_delay;
70 break;
71 }
72 key = (*f)();
73 if (key == -1) {
74 if (escape_delay) {
75 udelay(ESCAPE_UDELAY);
76 --escape_delay;
77 }
78 continue;
79 }
80 if (bufsize <= 2) {
81 if (key == '\r')
82 key = '\n';
83 *buffer++ = key;
84 *buffer = '\0';
85 return -1;
86 }
87 if (escape_delay == 0 && key == '\e') {
88 escape_delay = ESCAPE_DELAY;
89 ped = escape_data;
90 f_escape = f;
91 }
92 if (escape_delay) {
93 *ped++ = key;
94 if (f_escape != f) {
95 escape_delay = 2;
96 continue;
97 }
98 if (ped - escape_data == 1) {
99 /* \e */
100 continue;
101 } else if (ped - escape_data == 2) {
102 /* \e<something> */
103 if (key != '[')
104 escape_delay = 2;
105 continue;
106 } else if (ped - escape_data == 3) {
107 /* \e[<something> */
108 int mapkey = 0;
109 switch (key) {
110 case 'A': /* \e[A, up arrow */
111 mapkey = 16;
112 break;
113 case 'B': /* \e[B, down arrow */
114 mapkey = 14;
115 break;
116 case 'C': /* \e[C, right arrow */
117 mapkey = 6;
118 break;
119 case 'D': /* \e[D, left arrow */
120 mapkey = 2;
121 break;
122 case '1': /* dropthrough */
123 case '3': /* dropthrough */
124 /* \e[<1,3,4>], may be home, del, end */
125 case '4':
126 mapkey = -1;
127 break;
128 }
129 if (mapkey != -1) {
130 if (mapkey > 0) {
131 escape_data[0] = mapkey;
132 escape_data[1] = '\0';
133 }
134 escape_delay = 2;
135 }
136 continue;
137 } else if (ped - escape_data == 4) {
138 /* \e[<1,3,4><something> */
139 int mapkey = 0;
140 if (key == '~') {
141 switch (escape_data[2]) {
142 case '1': /* \e[1~, home */
143 mapkey = 1;
144 break;
145 case '3': /* \e[3~, del */
146 mapkey = 4;
147 break;
148 case '4': /* \e[4~, end */
149 mapkey = 5;
150 break;
151 }
152 }
153 if (mapkey > 0) {
154 escape_data[0] = mapkey;
155 escape_data[1] = '\0';
156 }
157 escape_delay = 2;
158 continue;
159 }
160 }
161 break; /* A key to process */
162 }
163 return key;
164}
165
166/*
167 * kdb_read
168 *
169 * This function reads a string of characters, terminated by
170 * a newline, or by reaching the end of the supplied buffer,
171 * from the current kernel debugger console device.
172 * Parameters:
173 * buffer - Address of character buffer to receive input characters.
174 * bufsize - size, in bytes, of the character buffer
175 * Returns:
176 * Returns a pointer to the buffer containing the received
177 * character string. This string will be terminated by a
178 * newline character.
179 * Locking:
180 * No locks are required to be held upon entry to this
181 * function. It is not reentrant - it relies on the fact
182 * that while kdb is running on only one "master debug" cpu.
183 * Remarks:
184 *
185 * The buffer size must be >= 2. A buffer size of 2 means that the caller only
186 * wants a single key.
187 *
188 * An escape key could be the start of a vt100 control sequence such as \e[D
189 * (left arrow) or it could be a character in its own right. The standard
190 * method for detecting the difference is to wait for 2 seconds to see if there
191 * are any other characters. kdb is complicated by the lack of a timer service
192 * (interrupts are off), by multiple input sources and by the need to sometimes
193 * return after just one key. Escape sequence processing has to be done as
194 * states in the polling loop.
195 */
196
197static char *kdb_read(char *buffer, size_t bufsize)
198{
199 char *cp = buffer;
200 char *bufend = buffer+bufsize-2; /* Reserve space for newline
201 * and null byte */
202 char *lastchar;
203 char *p_tmp;
204 char tmp;
205 static char tmpbuffer[CMD_BUFLEN];
206 int len = strlen(buffer);
207 int len_tmp;
208 int tab = 0;
209 int count;
210 int i;
211 int diag, dtab_count;
212 int key;
213
214
215 diag = kdbgetintenv("DTABCOUNT", &dtab_count);
216 if (diag)
217 dtab_count = 30;
218
219 if (len > 0) {
220 cp += len;
221 if (*(buffer+len-1) == '\n')
222 cp--;
223 }
224
225 lastchar = cp;
226 *cp = '\0';
227 kdb_printf("%s", buffer);
228poll_again:
229 key = kdb_read_get_key(buffer, bufsize);
230 if (key == -1)
231 return buffer;
232 if (key != 9)
233 tab = 0;
234 switch (key) {
235 case 8: /* backspace */
236 if (cp > buffer) {
237 if (cp < lastchar) {
238 memcpy(tmpbuffer, cp, lastchar - cp);
239 memcpy(cp-1, tmpbuffer, lastchar - cp);
240 }
241 *(--lastchar) = '\0';
242 --cp;
243 kdb_printf("\b%s \r", cp);
244 tmp = *cp;
245 *cp = '\0';
246 kdb_printf(kdb_prompt_str);
247 kdb_printf("%s", buffer);
248 *cp = tmp;
249 }
250 break;
251 case 13: /* enter */
252 *lastchar++ = '\n';
253 *lastchar++ = '\0';
254 kdb_printf("\n");
255 return buffer;
256 case 4: /* Del */
257 if (cp < lastchar) {
258 memcpy(tmpbuffer, cp+1, lastchar - cp - 1);
259 memcpy(cp, tmpbuffer, lastchar - cp - 1);
260 *(--lastchar) = '\0';
261 kdb_printf("%s \r", cp);
262 tmp = *cp;
263 *cp = '\0';
264 kdb_printf(kdb_prompt_str);
265 kdb_printf("%s", buffer);
266 *cp = tmp;
267 }
268 break;
269 case 1: /* Home */
270 if (cp > buffer) {
271 kdb_printf("\r");
272 kdb_printf(kdb_prompt_str);
273 cp = buffer;
274 }
275 break;
276 case 5: /* End */
277 if (cp < lastchar) {
278 kdb_printf("%s", cp);
279 cp = lastchar;
280 }
281 break;
282 case 2: /* Left */
283 if (cp > buffer) {
284 kdb_printf("\b");
285 --cp;
286 }
287 break;
288 case 14: /* Down */
289 memset(tmpbuffer, ' ',
290 strlen(kdb_prompt_str) + (lastchar-buffer));
291 *(tmpbuffer+strlen(kdb_prompt_str) +
292 (lastchar-buffer)) = '\0';
293 kdb_printf("\r%s\r", tmpbuffer);
294 *lastchar = (char)key;
295 *(lastchar+1) = '\0';
296 return lastchar;
297 case 6: /* Right */
298 if (cp < lastchar) {
299 kdb_printf("%c", *cp);
300 ++cp;
301 }
302 break;
303 case 16: /* Up */
304 memset(tmpbuffer, ' ',
305 strlen(kdb_prompt_str) + (lastchar-buffer));
306 *(tmpbuffer+strlen(kdb_prompt_str) +
307 (lastchar-buffer)) = '\0';
308 kdb_printf("\r%s\r", tmpbuffer);
309 *lastchar = (char)key;
310 *(lastchar+1) = '\0';
311 return lastchar;
312 case 9: /* Tab */
313 if (tab < 2)
314 ++tab;
315 p_tmp = buffer;
316 while (*p_tmp == ' ')
317 p_tmp++;
318 if (p_tmp > cp)
319 break;
320 memcpy(tmpbuffer, p_tmp, cp-p_tmp);
321 *(tmpbuffer + (cp-p_tmp)) = '\0';
322 p_tmp = strrchr(tmpbuffer, ' ');
323 if (p_tmp)
324 ++p_tmp;
325 else
326 p_tmp = tmpbuffer;
327 len = strlen(p_tmp);
328 count = kallsyms_symbol_complete(p_tmp,
329 sizeof(tmpbuffer) -
330 (p_tmp - tmpbuffer));
331 if (tab == 2 && count > 0) {
332 kdb_printf("\n%d symbols are found.", count);
333 if (count > dtab_count) {
334 count = dtab_count;
335 kdb_printf(" But only first %d symbols will"
336 " be printed.\nYou can change the"
337 " environment variable DTABCOUNT.",
338 count);
339 }
340 kdb_printf("\n");
341 for (i = 0; i < count; i++) {
342 if (kallsyms_symbol_next(p_tmp, i) < 0)
343 break;
344 kdb_printf("%s ", p_tmp);
345 *(p_tmp + len) = '\0';
346 }
347 if (i >= dtab_count)
348 kdb_printf("...");
349 kdb_printf("\n");
350 kdb_printf(kdb_prompt_str);
351 kdb_printf("%s", buffer);
352 } else if (tab != 2 && count > 0) {
353 len_tmp = strlen(p_tmp);
354 strncpy(p_tmp+len_tmp, cp, lastchar-cp+1);
355 len_tmp = strlen(p_tmp);
356 strncpy(cp, p_tmp+len, len_tmp-len + 1);
357 len = len_tmp - len;
358 kdb_printf("%s", cp);
359 cp += len;
360 lastchar += len;
361 }
362 kdb_nextline = 1; /* reset output line number */
363 break;
364 default:
365 if (key >= 32 && lastchar < bufend) {
366 if (cp < lastchar) {
367 memcpy(tmpbuffer, cp, lastchar - cp);
368 memcpy(cp+1, tmpbuffer, lastchar - cp);
369 *++lastchar = '\0';
370 *cp = key;
371 kdb_printf("%s\r", cp);
372 ++cp;
373 tmp = *cp;
374 *cp = '\0';
375 kdb_printf(kdb_prompt_str);
376 kdb_printf("%s", buffer);
377 *cp = tmp;
378 } else {
379 *++lastchar = '\0';
380 *cp++ = key;
381 /* The kgdb transition check will hide
382 * printed characters if we think that
383 * kgdb is connecting, until the check
384 * fails */
385 if (!KDB_STATE(KGDB_TRANS))
386 kgdb_transition_check(buffer);
387 else
388 kdb_printf("%c", key);
389 }
390 /* Special escape to kgdb */
391 if (lastchar - buffer >= 5 &&
392 strcmp(lastchar - 5, "$?#3f") == 0) {
393 strcpy(buffer, "kgdb");
394 KDB_STATE_SET(DOING_KGDB);
395 return buffer;
396 }
397 if (lastchar - buffer >= 14 &&
398 strcmp(lastchar - 14, "$qSupported#37") == 0) {
399 strcpy(buffer, "kgdb");
400 KDB_STATE_SET(DOING_KGDB2);
401 return buffer;
402 }
403 }
404 break;
405 }
406 goto poll_again;
407}
408
409/*
410 * kdb_getstr
411 *
412 * Print the prompt string and read a command from the
413 * input device.
414 *
415 * Parameters:
416 * buffer Address of buffer to receive command
417 * bufsize Size of buffer in bytes
418 * prompt Pointer to string to use as prompt string
419 * Returns:
420 * Pointer to command buffer.
421 * Locking:
422 * None.
423 * Remarks:
424 * For SMP kernels, the processor number will be
425 * substituted for %d, %x or %o in the prompt.
426 */
427
428char *kdb_getstr(char *buffer, size_t bufsize, char *prompt)
429{
430 if (prompt && kdb_prompt_str != prompt)
431 strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
432 kdb_printf(kdb_prompt_str);
433 kdb_nextline = 1; /* Prompt and input resets line number */
434 return kdb_read(buffer, bufsize);
435}
436
437/*
438 * kdb_input_flush
439 *
440 * Get rid of any buffered console input.
441 *
442 * Parameters:
443 * none
444 * Returns:
445 * nothing
446 * Locking:
447 * none
448 * Remarks:
449 * Call this function whenever you want to flush input. If there is any
450 * outstanding input, it ignores all characters until there has been no
451 * data for approximately 1ms.
452 */
453
454static void kdb_input_flush(void)
455{
456 get_char_func *f;
457 int res;
458 int flush_delay = 1;
459 while (flush_delay) {
460 flush_delay--;
461empty:
462 touch_nmi_watchdog();
463 for (f = &kdb_poll_funcs[0]; *f; ++f) {
464 res = (*f)();
465 if (res != -1) {
466 flush_delay = 1;
467 goto empty;
468 }
469 }
470 if (flush_delay)
471 mdelay(1);
472 }
473}
474
475/*
476 * kdb_printf
477 *
478 * Print a string to the output device(s).
479 *
480 * Parameters:
481 * printf-like format and optional args.
482 * Returns:
483 * 0
484 * Locking:
485 * None.
486 * Remarks:
487 * use 'kdbcons->write()' to avoid polluting 'log_buf' with
488 * kdb output.
489 *
490 * If the user is doing a cmd args | grep srch
491 * then kdb_grepping_flag is set.
492 * In that case we need to accumulate full lines (ending in \n) before
493 * searching for the pattern.
494 */
495
496static char kdb_buffer[256]; /* A bit too big to go on stack */
497static char *next_avail = kdb_buffer;
498static int size_avail;
499static int suspend_grep;
500
501/*
502 * search arg1 to see if it contains arg2
503 * (kdmain.c provides flags for ^pat and pat$)
504 *
505 * return 1 for found, 0 for not found
506 */
507static int kdb_search_string(char *searched, char *searchfor)
508{
509 char firstchar, *cp;
510 int len1, len2;
511
512 /* not counting the newline at the end of "searched" */
513 len1 = strlen(searched)-1;
514 len2 = strlen(searchfor);
515 if (len1 < len2)
516 return 0;
517 if (kdb_grep_leading && kdb_grep_trailing && len1 != len2)
518 return 0;
519 if (kdb_grep_leading) {
520 if (!strncmp(searched, searchfor, len2))
521 return 1;
522 } else if (kdb_grep_trailing) {
523 if (!strncmp(searched+len1-len2, searchfor, len2))
524 return 1;
525 } else {
526 firstchar = *searchfor;
527 cp = searched;
528 while ((cp = strchr(cp, firstchar))) {
529 if (!strncmp(cp, searchfor, len2))
530 return 1;
531 cp++;
532 }
533 }
534 return 0;
535}
536
537int vkdb_printf(const char *fmt, va_list ap)
538{
539 int diag;
540 int linecount;
541 int logging, saved_loglevel = 0;
542 int saved_trap_printk;
543 int got_printf_lock = 0;
544 int retlen = 0;
545 int fnd, len;
546 char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
547 char *moreprompt = "more> ";
548 struct console *c = console_drivers;
549 static DEFINE_SPINLOCK(kdb_printf_lock);
550 unsigned long uninitialized_var(flags);
551
552 preempt_disable();
553 saved_trap_printk = kdb_trap_printk;
554 kdb_trap_printk = 0;
555
556 /* Serialize kdb_printf if multiple cpus try to write at once.
557 * But if any cpu goes recursive in kdb, just print the output,
558 * even if it is interleaved with any other text.
559 */
560 if (!KDB_STATE(PRINTF_LOCK)) {
561 KDB_STATE_SET(PRINTF_LOCK);
562 spin_lock_irqsave(&kdb_printf_lock, flags);
563 got_printf_lock = 1;
564 atomic_inc(&kdb_event);
565 } else {
566 __acquire(kdb_printf_lock);
567 }
568
569 diag = kdbgetintenv("LINES", &linecount);
570 if (diag || linecount <= 1)
571 linecount = 24;
572
573 diag = kdbgetintenv("LOGGING", &logging);
574 if (diag)
575 logging = 0;
576
577 if (!kdb_grepping_flag || suspend_grep) {
578 /* normally, every vsnprintf starts a new buffer */
579 next_avail = kdb_buffer;
580 size_avail = sizeof(kdb_buffer);
581 }
582 vsnprintf(next_avail, size_avail, fmt, ap);
583
584 /*
585 * If kdb_parse() found that the command was cmd xxx | grep yyy
586 * then kdb_grepping_flag is set, and kdb_grep_string contains yyy
587 *
588 * Accumulate the print data up to a newline before searching it.
589 * (vsnprintf does null-terminate the string that it generates)
590 */
591
592 /* skip the search if prints are temporarily unconditional */
593 if (!suspend_grep && kdb_grepping_flag) {
594 cp = strchr(kdb_buffer, '\n');
595 if (!cp) {
596 /*
597 * Special cases that don't end with newlines
598 * but should be written without one:
599 * The "[nn]kdb> " prompt should
600 * appear at the front of the buffer.
601 *
602 * The "[nn]more " prompt should also be
603 * (MOREPROMPT -> moreprompt)
604 * written * but we print that ourselves,
605 * we set the suspend_grep flag to make
606 * it unconditional.
607 *
608 */
609 if (next_avail == kdb_buffer) {
610 /*
611 * these should occur after a newline,
612 * so they will be at the front of the
613 * buffer
614 */
615 cp2 = kdb_buffer;
616 len = strlen(kdb_prompt_str);
617 if (!strncmp(cp2, kdb_prompt_str, len)) {
618 /*
619 * We're about to start a new
620 * command, so we can go back
621 * to normal mode.
622 */
623 kdb_grepping_flag = 0;
624 goto kdb_printit;
625 }
626 }
627 /* no newline; don't search/write the buffer
628 until one is there */
629 len = strlen(kdb_buffer);
630 next_avail = kdb_buffer + len;
631 size_avail = sizeof(kdb_buffer) - len;
632 goto kdb_print_out;
633 }
634
635 /*
636 * The newline is present; print through it or discard
637 * it, depending on the results of the search.
638 */
639 cp++; /* to byte after the newline */
640 replaced_byte = *cp; /* remember what/where it was */
641 cphold = cp;
642 *cp = '\0'; /* end the string for our search */
643
644 /*
645 * We now have a newline at the end of the string
646 * Only continue with this output if it contains the
647 * search string.
648 */
649 fnd = kdb_search_string(kdb_buffer, kdb_grep_string);
650 if (!fnd) {
651 /*
652 * At this point the complete line at the start
653 * of kdb_buffer can be discarded, as it does
654 * not contain what the user is looking for.
655 * Shift the buffer left.
656 */
657 *cphold = replaced_byte;
658 strcpy(kdb_buffer, cphold);
659 len = strlen(kdb_buffer);
660 next_avail = kdb_buffer + len;
661 size_avail = sizeof(kdb_buffer) - len;
662 goto kdb_print_out;
663 }
664 /*
665 * at this point the string is a full line and
666 * should be printed, up to the null.
667 */
668 }
669kdb_printit:
670
671 /*
672 * Write to all consoles.
673 */
674 retlen = strlen(kdb_buffer);
675 if (!dbg_kdb_mode && kgdb_connected) {
676 gdbstub_msg_write(kdb_buffer, retlen);
677 } else {
678 if (!dbg_io_ops->is_console) {
679 len = strlen(kdb_buffer);
680 cp = kdb_buffer;
681 while (len--) {
682 dbg_io_ops->write_char(*cp);
683 cp++;
684 }
685 }
686 while (c) {
687 c->write(c, kdb_buffer, retlen);
688 touch_nmi_watchdog();
689 c = c->next;
690 }
691 }
692 if (logging) {
693 saved_loglevel = console_loglevel;
694 console_loglevel = 0;
695 printk(KERN_INFO "%s", kdb_buffer);
696 }
697
698 if (KDB_STATE(PAGER) && strchr(kdb_buffer, '\n'))
699 kdb_nextline++;
700
701 /* check for having reached the LINES number of printed lines */
702 if (kdb_nextline == linecount) {
703 char buf1[16] = "";
704#if defined(CONFIG_SMP)
705 char buf2[32];
706#endif
707
708 /* Watch out for recursion here. Any routine that calls
709 * kdb_printf will come back through here. And kdb_read
710 * uses kdb_printf to echo on serial consoles ...
711 */
712 kdb_nextline = 1; /* In case of recursion */
713
714 /*
715 * Pause until cr.
716 */
717 moreprompt = kdbgetenv("MOREPROMPT");
718 if (moreprompt == NULL)
719 moreprompt = "more> ";
720
721#if defined(CONFIG_SMP)
722 if (strchr(moreprompt, '%')) {
723 sprintf(buf2, moreprompt, get_cpu());
724 put_cpu();
725 moreprompt = buf2;
726 }
727#endif
728
729 kdb_input_flush();
730 c = console_drivers;
731
732 if (!dbg_io_ops->is_console) {
733 len = strlen(moreprompt);
734 cp = moreprompt;
735 while (len--) {
736 dbg_io_ops->write_char(*cp);
737 cp++;
738 }
739 }
740 while (c) {
741 c->write(c, moreprompt, strlen(moreprompt));
742 touch_nmi_watchdog();
743 c = c->next;
744 }
745
746 if (logging)
747 printk("%s", moreprompt);
748
749 kdb_read(buf1, 2); /* '2' indicates to return
750 * immediately after getting one key. */
751 kdb_nextline = 1; /* Really set output line 1 */
752
753 /* empty and reset the buffer: */
754 kdb_buffer[0] = '\0';
755 next_avail = kdb_buffer;
756 size_avail = sizeof(kdb_buffer);
757 if ((buf1[0] == 'q') || (buf1[0] == 'Q')) {
758 /* user hit q or Q */
759 KDB_FLAG_SET(CMD_INTERRUPT); /* command interrupted */
760 KDB_STATE_CLEAR(PAGER);
761 /* end of command output; back to normal mode */
762 kdb_grepping_flag = 0;
763 kdb_printf("\n");
764 } else if (buf1[0] == ' ') {
765 kdb_printf("\n");
766 suspend_grep = 1; /* for this recursion */
767 } else if (buf1[0] == '\n') {
768 kdb_nextline = linecount - 1;
769 kdb_printf("\r");
770 suspend_grep = 1; /* for this recursion */
771 } else if (buf1[0] && buf1[0] != '\n') {
772 /* user hit something other than enter */
773 suspend_grep = 1; /* for this recursion */
774 kdb_printf("\nOnly 'q' or 'Q' are processed at more "
775 "prompt, input ignored\n");
776 } else if (kdb_grepping_flag) {
777 /* user hit enter */
778 suspend_grep = 1; /* for this recursion */
779 kdb_printf("\n");
780 }
781 kdb_input_flush();
782 }
783
784 /*
785 * For grep searches, shift the printed string left.
786 * replaced_byte contains the character that was overwritten with
787 * the terminating null, and cphold points to the null.
788 * Then adjust the notion of available space in the buffer.
789 */
790 if (kdb_grepping_flag && !suspend_grep) {
791 *cphold = replaced_byte;
792 strcpy(kdb_buffer, cphold);
793 len = strlen(kdb_buffer);
794 next_avail = kdb_buffer + len;
795 size_avail = sizeof(kdb_buffer) - len;
796 }
797
798kdb_print_out:
799 suspend_grep = 0; /* end of what may have been a recursive call */
800 if (logging)
801 console_loglevel = saved_loglevel;
802 if (KDB_STATE(PRINTF_LOCK) && got_printf_lock) {
803 got_printf_lock = 0;
804 spin_unlock_irqrestore(&kdb_printf_lock, flags);
805 KDB_STATE_CLEAR(PRINTF_LOCK);
806 atomic_dec(&kdb_event);
807 } else {
808 __release(kdb_printf_lock);
809 }
810 kdb_trap_printk = saved_trap_printk;
811 preempt_enable();
812 return retlen;
813}
814
815int kdb_printf(const char *fmt, ...)
816{
817 va_list ap;
818 int r;
819
820 va_start(ap, fmt);
821 r = vkdb_printf(fmt, ap);
822 va_end(ap);
823
824 return r;
825}
826
diff --git a/kernel/debug/kdb/kdb_keyboard.c b/kernel/debug/kdb/kdb_keyboard.c
new file mode 100644
index 000000000000..4bca634975c0
--- /dev/null
+++ b/kernel/debug/kdb/kdb_keyboard.c
@@ -0,0 +1,212 @@
1/*
2 * Kernel Debugger Architecture Dependent Console I/O handler
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License.
6 *
7 * Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved.
8 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
9 */
10
11#include <linux/kdb.h>
12#include <linux/keyboard.h>
13#include <linux/ctype.h>
14#include <linux/module.h>
15#include <linux/io.h>
16
17/* Keyboard Controller Registers on normal PCs. */
18
19#define KBD_STATUS_REG 0x64 /* Status register (R) */
20#define KBD_DATA_REG 0x60 /* Keyboard data register (R/W) */
21
22/* Status Register Bits */
23
24#define KBD_STAT_OBF 0x01 /* Keyboard output buffer full */
25#define KBD_STAT_MOUSE_OBF 0x20 /* Mouse output buffer full */
26
27static int kbd_exists;
28
29/*
30 * Check if the keyboard controller has a keypress for us.
31 * Some parts (Enter Release, LED change) are still blocking polled here,
32 * but hopefully they are all short.
33 */
34int kdb_get_kbd_char(void)
35{
36 int scancode, scanstatus;
37 static int shift_lock; /* CAPS LOCK state (0-off, 1-on) */
38 static int shift_key; /* Shift next keypress */
39 static int ctrl_key;
40 u_short keychar;
41
42 if (KDB_FLAG(NO_I8042) || KDB_FLAG(NO_VT_CONSOLE) ||
43 (inb(KBD_STATUS_REG) == 0xff && inb(KBD_DATA_REG) == 0xff)) {
44 kbd_exists = 0;
45 return -1;
46 }
47 kbd_exists = 1;
48
49 if ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0)
50 return -1;
51
52 /*
53 * Fetch the scancode
54 */
55 scancode = inb(KBD_DATA_REG);
56 scanstatus = inb(KBD_STATUS_REG);
57
58 /*
59 * Ignore mouse events.
60 */
61 if (scanstatus & KBD_STAT_MOUSE_OBF)
62 return -1;
63
64 /*
65 * Ignore release, trigger on make
66 * (except for shift keys, where we want to
67 * keep the shift state so long as the key is
68 * held down).
69 */
70
71 if (((scancode&0x7f) == 0x2a) || ((scancode&0x7f) == 0x36)) {
72 /*
73 * Next key may use shift table
74 */
75 if ((scancode & 0x80) == 0)
76 shift_key = 1;
77 else
78 shift_key = 0;
79 return -1;
80 }
81
82 if ((scancode&0x7f) == 0x1d) {
83 /*
84 * Left ctrl key
85 */
86 if ((scancode & 0x80) == 0)
87 ctrl_key = 1;
88 else
89 ctrl_key = 0;
90 return -1;
91 }
92
93 if ((scancode & 0x80) != 0)
94 return -1;
95
96 scancode &= 0x7f;
97
98 /*
99 * Translate scancode
100 */
101
102 if (scancode == 0x3a) {
103 /*
104 * Toggle caps lock
105 */
106 shift_lock ^= 1;
107
108#ifdef KDB_BLINK_LED
109 kdb_toggleled(0x4);
110#endif
111 return -1;
112 }
113
114 if (scancode == 0x0e) {
115 /*
116 * Backspace
117 */
118 return 8;
119 }
120
121 /* Special Key */
122 switch (scancode) {
123 case 0xF: /* Tab */
124 return 9;
125 case 0x53: /* Del */
126 return 4;
127 case 0x47: /* Home */
128 return 1;
129 case 0x4F: /* End */
130 return 5;
131 case 0x4B: /* Left */
132 return 2;
133 case 0x48: /* Up */
134 return 16;
135 case 0x50: /* Down */
136 return 14;
137 case 0x4D: /* Right */
138 return 6;
139 }
140
141 if (scancode == 0xe0)
142 return -1;
143
144 /*
145 * For Japanese 86/106 keyboards
146 * See comment in drivers/char/pc_keyb.c.
147 * - Masahiro Adegawa
148 */
149 if (scancode == 0x73)
150 scancode = 0x59;
151 else if (scancode == 0x7d)
152 scancode = 0x7c;
153
154 if (!shift_lock && !shift_key && !ctrl_key) {
155 keychar = plain_map[scancode];
156 } else if ((shift_lock || shift_key) && key_maps[1]) {
157 keychar = key_maps[1][scancode];
158 } else if (ctrl_key && key_maps[4]) {
159 keychar = key_maps[4][scancode];
160 } else {
161 keychar = 0x0020;
162 kdb_printf("Unknown state/scancode (%d)\n", scancode);
163 }
164 keychar &= 0x0fff;
165 if (keychar == '\t')
166 keychar = ' ';
167 switch (KTYP(keychar)) {
168 case KT_LETTER:
169 case KT_LATIN:
170 if (isprint(keychar))
171 break; /* printable characters */
172 /* drop through */
173 case KT_SPEC:
174 if (keychar == K_ENTER)
175 break;
176 /* drop through */
177 default:
178 return -1; /* ignore unprintables */
179 }
180
181 if ((scancode & 0x7f) == 0x1c) {
182 /*
183 * enter key. All done. Absorb the release scancode.
184 */
185 while ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0)
186 ;
187
188 /*
189 * Fetch the scancode
190 */
191 scancode = inb(KBD_DATA_REG);
192 scanstatus = inb(KBD_STATUS_REG);
193
194 while (scanstatus & KBD_STAT_MOUSE_OBF) {
195 scancode = inb(KBD_DATA_REG);
196 scanstatus = inb(KBD_STATUS_REG);
197 }
198
199 if (scancode != 0x9c) {
200 /*
201 * Wasn't an enter-release, why not?
202 */
203 kdb_printf("kdb: expected enter got 0x%x status 0x%x\n",
204 scancode, scanstatus);
205 }
206
207 return 13;
208 }
209
210 return keychar & 0xff;
211}
212EXPORT_SYMBOL_GPL(kdb_get_kbd_char);
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
new file mode 100644
index 000000000000..b724c791b6d4
--- /dev/null
+++ b/kernel/debug/kdb/kdb_main.c
@@ -0,0 +1,2849 @@
1/*
2 * Kernel Debugger Architecture Independent Main Code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
10 * Xscale (R) modifications copyright (C) 2003 Intel Corporation.
11 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
12 */
13
14#include <linux/ctype.h>
15#include <linux/string.h>
16#include <linux/kernel.h>
17#include <linux/reboot.h>
18#include <linux/sched.h>
19#include <linux/sysrq.h>
20#include <linux/smp.h>
21#include <linux/utsname.h>
22#include <linux/vmalloc.h>
23#include <linux/module.h>
24#include <linux/mm.h>
25#include <linux/init.h>
26#include <linux/kallsyms.h>
27#include <linux/kgdb.h>
28#include <linux/kdb.h>
29#include <linux/notifier.h>
30#include <linux/interrupt.h>
31#include <linux/delay.h>
32#include <linux/nmi.h>
33#include <linux/time.h>
34#include <linux/ptrace.h>
35#include <linux/sysctl.h>
36#include <linux/cpu.h>
37#include <linux/kdebug.h>
38#include <linux/proc_fs.h>
39#include <linux/uaccess.h>
40#include <linux/slab.h>
41#include "kdb_private.h"
42
43#define GREP_LEN 256
44char kdb_grep_string[GREP_LEN];
45int kdb_grepping_flag;
46EXPORT_SYMBOL(kdb_grepping_flag);
47int kdb_grep_leading;
48int kdb_grep_trailing;
49
50/*
51 * Kernel debugger state flags
52 */
53int kdb_flags;
54atomic_t kdb_event;
55
56/*
57 * kdb_lock protects updates to kdb_initial_cpu. Used to
58 * single thread processors through the kernel debugger.
59 */
60int kdb_initial_cpu = -1; /* cpu number that owns kdb */
61int kdb_nextline = 1;
62int kdb_state; /* General KDB state */
63
64struct task_struct *kdb_current_task;
65EXPORT_SYMBOL(kdb_current_task);
66struct pt_regs *kdb_current_regs;
67
68const char *kdb_diemsg;
69static int kdb_go_count;
70#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
71static unsigned int kdb_continue_catastrophic =
72 CONFIG_KDB_CONTINUE_CATASTROPHIC;
73#else
74static unsigned int kdb_continue_catastrophic;
75#endif
76
77/* kdb_commands describes the available commands. */
78static kdbtab_t *kdb_commands;
79#define KDB_BASE_CMD_MAX 50
80static int kdb_max_commands = KDB_BASE_CMD_MAX;
81static kdbtab_t kdb_base_commands[50];
82#define for_each_kdbcmd(cmd, num) \
83 for ((cmd) = kdb_base_commands, (num) = 0; \
84 num < kdb_max_commands; \
85 num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++, num++)
86
87typedef struct _kdbmsg {
88 int km_diag; /* kdb diagnostic */
89 char *km_msg; /* Corresponding message text */
90} kdbmsg_t;
91
92#define KDBMSG(msgnum, text) \
93 { KDB_##msgnum, text }
94
95static kdbmsg_t kdbmsgs[] = {
96 KDBMSG(NOTFOUND, "Command Not Found"),
97 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
98 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
99 "8 is only allowed on 64 bit systems"),
100 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
101 KDBMSG(NOTENV, "Cannot find environment variable"),
102 KDBMSG(NOENVVALUE, "Environment variable should have value"),
103 KDBMSG(NOTIMP, "Command not implemented"),
104 KDBMSG(ENVFULL, "Environment full"),
105 KDBMSG(ENVBUFFULL, "Environment buffer full"),
106 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
107#ifdef CONFIG_CPU_XSCALE
108 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
109#else
110 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
111#endif
112 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
113 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
114 KDBMSG(BADMODE, "Invalid IDMODE"),
115 KDBMSG(BADINT, "Illegal numeric value"),
116 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
117 KDBMSG(BADREG, "Invalid register name"),
118 KDBMSG(BADCPUNUM, "Invalid cpu number"),
119 KDBMSG(BADLENGTH, "Invalid length field"),
120 KDBMSG(NOBP, "No Breakpoint exists"),
121 KDBMSG(BADADDR, "Invalid address"),
122};
123#undef KDBMSG
124
125static const int __nkdb_err = sizeof(kdbmsgs) / sizeof(kdbmsg_t);
126
127
128/*
129 * Initial environment. This is all kept static and local to
130 * this file. We don't want to rely on the memory allocation
131 * mechanisms in the kernel, so we use a very limited allocate-only
132 * heap for new and altered environment variables. The entire
133 * environment is limited to a fixed number of entries (add more
134 * to __env[] if required) and a fixed amount of heap (add more to
135 * KDB_ENVBUFSIZE if required).
136 */
137
138static char *__env[] = {
139#if defined(CONFIG_SMP)
140 "PROMPT=[%d]kdb> ",
141 "MOREPROMPT=[%d]more> ",
142#else
143 "PROMPT=kdb> ",
144 "MOREPROMPT=more> ",
145#endif
146 "RADIX=16",
147 "MDCOUNT=8", /* lines of md output */
148 "BTARGS=9", /* 9 possible args in bt */
149 KDB_PLATFORM_ENV,
150 "DTABCOUNT=30",
151 "NOSECT=1",
152 (char *)0,
153 (char *)0,
154 (char *)0,
155 (char *)0,
156 (char *)0,
157 (char *)0,
158 (char *)0,
159 (char *)0,
160 (char *)0,
161 (char *)0,
162 (char *)0,
163 (char *)0,
164 (char *)0,
165 (char *)0,
166 (char *)0,
167 (char *)0,
168 (char *)0,
169 (char *)0,
170 (char *)0,
171 (char *)0,
172 (char *)0,
173 (char *)0,
174 (char *)0,
175};
176
177static const int __nenv = (sizeof(__env) / sizeof(char *));
178
179struct task_struct *kdb_curr_task(int cpu)
180{
181 struct task_struct *p = curr_task(cpu);
182#ifdef _TIF_MCA_INIT
183 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
184 p = krp->p;
185#endif
186 return p;
187}
188
189/*
190 * kdbgetenv - This function will return the character string value of
191 * an environment variable.
192 * Parameters:
193 * match A character string representing an environment variable.
194 * Returns:
195 * NULL No environment variable matches 'match'
196 * char* Pointer to string value of environment variable.
197 */
198char *kdbgetenv(const char *match)
199{
200 char **ep = __env;
201 int matchlen = strlen(match);
202 int i;
203
204 for (i = 0; i < __nenv; i++) {
205 char *e = *ep++;
206
207 if (!e)
208 continue;
209
210 if ((strncmp(match, e, matchlen) == 0)
211 && ((e[matchlen] == '\0')
212 || (e[matchlen] == '='))) {
213 char *cp = strchr(e, '=');
214 return cp ? ++cp : "";
215 }
216 }
217 return NULL;
218}
219
220/*
221 * kdballocenv - This function is used to allocate bytes for
222 * environment entries.
223 * Parameters:
224 * match A character string representing a numeric value
225 * Outputs:
226 * *value the unsigned long representation of the env variable 'match'
227 * Returns:
228 * Zero on success, a kdb diagnostic on failure.
229 * Remarks:
230 * We use a static environment buffer (envbuffer) to hold the values
231 * of dynamically generated environment variables (see kdb_set). Buffer
232 * space once allocated is never free'd, so over time, the amount of space
233 * (currently 512 bytes) will be exhausted if env variables are changed
234 * frequently.
235 */
236static char *kdballocenv(size_t bytes)
237{
238#define KDB_ENVBUFSIZE 512
239 static char envbuffer[KDB_ENVBUFSIZE];
240 static int envbufsize;
241 char *ep = NULL;
242
243 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
244 ep = &envbuffer[envbufsize];
245 envbufsize += bytes;
246 }
247 return ep;
248}
249
250/*
251 * kdbgetulenv - This function will return the value of an unsigned
252 * long-valued environment variable.
253 * Parameters:
254 * match A character string representing a numeric value
255 * Outputs:
256 * *value the unsigned long represntation of the env variable 'match'
257 * Returns:
258 * Zero on success, a kdb diagnostic on failure.
259 */
260static int kdbgetulenv(const char *match, unsigned long *value)
261{
262 char *ep;
263
264 ep = kdbgetenv(match);
265 if (!ep)
266 return KDB_NOTENV;
267 if (strlen(ep) == 0)
268 return KDB_NOENVVALUE;
269
270 *value = simple_strtoul(ep, NULL, 0);
271
272 return 0;
273}
274
275/*
276 * kdbgetintenv - This function will return the value of an
277 * integer-valued environment variable.
278 * Parameters:
279 * match A character string representing an integer-valued env variable
280 * Outputs:
281 * *value the integer representation of the environment variable 'match'
282 * Returns:
283 * Zero on success, a kdb diagnostic on failure.
284 */
285int kdbgetintenv(const char *match, int *value)
286{
287 unsigned long val;
288 int diag;
289
290 diag = kdbgetulenv(match, &val);
291 if (!diag)
292 *value = (int) val;
293 return diag;
294}
295
296/*
297 * kdbgetularg - This function will convert a numeric string into an
298 * unsigned long value.
299 * Parameters:
300 * arg A character string representing a numeric value
301 * Outputs:
302 * *value the unsigned long represntation of arg.
303 * Returns:
304 * Zero on success, a kdb diagnostic on failure.
305 */
306int kdbgetularg(const char *arg, unsigned long *value)
307{
308 char *endp;
309 unsigned long val;
310
311 val = simple_strtoul(arg, &endp, 0);
312
313 if (endp == arg) {
314 /*
315 * Try base 16, for us folks too lazy to type the
316 * leading 0x...
317 */
318 val = simple_strtoul(arg, &endp, 16);
319 if (endp == arg)
320 return KDB_BADINT;
321 }
322
323 *value = val;
324
325 return 0;
326}
327
328/*
329 * kdb_set - This function implements the 'set' command. Alter an
330 * existing environment variable or create a new one.
331 */
332int kdb_set(int argc, const char **argv)
333{
334 int i;
335 char *ep;
336 size_t varlen, vallen;
337
338 /*
339 * we can be invoked two ways:
340 * set var=value argv[1]="var", argv[2]="value"
341 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
342 * - if the latter, shift 'em down.
343 */
344 if (argc == 3) {
345 argv[2] = argv[3];
346 argc--;
347 }
348
349 if (argc != 2)
350 return KDB_ARGCOUNT;
351
352 /*
353 * Check for internal variables
354 */
355 if (strcmp(argv[1], "KDBDEBUG") == 0) {
356 unsigned int debugflags;
357 char *cp;
358
359 debugflags = simple_strtoul(argv[2], &cp, 0);
360 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
361 kdb_printf("kdb: illegal debug flags '%s'\n",
362 argv[2]);
363 return 0;
364 }
365 kdb_flags = (kdb_flags &
366 ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
367 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
368
369 return 0;
370 }
371
372 /*
373 * Tokenizer squashed the '=' sign. argv[1] is variable
374 * name, argv[2] = value.
375 */
376 varlen = strlen(argv[1]);
377 vallen = strlen(argv[2]);
378 ep = kdballocenv(varlen + vallen + 2);
379 if (ep == (char *)0)
380 return KDB_ENVBUFFULL;
381
382 sprintf(ep, "%s=%s", argv[1], argv[2]);
383
384 ep[varlen+vallen+1] = '\0';
385
386 for (i = 0; i < __nenv; i++) {
387 if (__env[i]
388 && ((strncmp(__env[i], argv[1], varlen) == 0)
389 && ((__env[i][varlen] == '\0')
390 || (__env[i][varlen] == '=')))) {
391 __env[i] = ep;
392 return 0;
393 }
394 }
395
396 /*
397 * Wasn't existing variable. Fit into slot.
398 */
399 for (i = 0; i < __nenv-1; i++) {
400 if (__env[i] == (char *)0) {
401 __env[i] = ep;
402 return 0;
403 }
404 }
405
406 return KDB_ENVFULL;
407}
408
409static int kdb_check_regs(void)
410{
411 if (!kdb_current_regs) {
412 kdb_printf("No current kdb registers."
413 " You may need to select another task\n");
414 return KDB_BADREG;
415 }
416 return 0;
417}
418
419/*
420 * kdbgetaddrarg - This function is responsible for parsing an
421 * address-expression and returning the value of the expression,
422 * symbol name, and offset to the caller.
423 *
424 * The argument may consist of a numeric value (decimal or
425 * hexidecimal), a symbol name, a register name (preceeded by the
426 * percent sign), an environment variable with a numeric value
427 * (preceeded by a dollar sign) or a simple arithmetic expression
428 * consisting of a symbol name, +/-, and a numeric constant value
429 * (offset).
430 * Parameters:
431 * argc - count of arguments in argv
432 * argv - argument vector
433 * *nextarg - index to next unparsed argument in argv[]
434 * regs - Register state at time of KDB entry
435 * Outputs:
436 * *value - receives the value of the address-expression
437 * *offset - receives the offset specified, if any
438 * *name - receives the symbol name, if any
439 * *nextarg - index to next unparsed argument in argv[]
440 * Returns:
441 * zero is returned on success, a kdb diagnostic code is
442 * returned on error.
443 */
444int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
445 unsigned long *value, long *offset,
446 char **name)
447{
448 unsigned long addr;
449 unsigned long off = 0;
450 int positive;
451 int diag;
452 int found = 0;
453 char *symname;
454 char symbol = '\0';
455 char *cp;
456 kdb_symtab_t symtab;
457
458 /*
459 * Process arguments which follow the following syntax:
460 *
461 * symbol | numeric-address [+/- numeric-offset]
462 * %register
463 * $environment-variable
464 */
465
466 if (*nextarg > argc)
467 return KDB_ARGCOUNT;
468
469 symname = (char *)argv[*nextarg];
470
471 /*
472 * If there is no whitespace between the symbol
473 * or address and the '+' or '-' symbols, we
474 * remember the character and replace it with a
475 * null so the symbol/value can be properly parsed
476 */
477 cp = strpbrk(symname, "+-");
478 if (cp != NULL) {
479 symbol = *cp;
480 *cp++ = '\0';
481 }
482
483 if (symname[0] == '$') {
484 diag = kdbgetulenv(&symname[1], &addr);
485 if (diag)
486 return diag;
487 } else if (symname[0] == '%') {
488 diag = kdb_check_regs();
489 if (diag)
490 return diag;
491 /* Implement register values with % at a later time as it is
492 * arch optional.
493 */
494 return KDB_NOTIMP;
495 } else {
496 found = kdbgetsymval(symname, &symtab);
497 if (found) {
498 addr = symtab.sym_start;
499 } else {
500 diag = kdbgetularg(argv[*nextarg], &addr);
501 if (diag)
502 return diag;
503 }
504 }
505
506 if (!found)
507 found = kdbnearsym(addr, &symtab);
508
509 (*nextarg)++;
510
511 if (name)
512 *name = symname;
513 if (value)
514 *value = addr;
515 if (offset && name && *name)
516 *offset = addr - symtab.sym_start;
517
518 if ((*nextarg > argc)
519 && (symbol == '\0'))
520 return 0;
521
522 /*
523 * check for +/- and offset
524 */
525
526 if (symbol == '\0') {
527 if ((argv[*nextarg][0] != '+')
528 && (argv[*nextarg][0] != '-')) {
529 /*
530 * Not our argument. Return.
531 */
532 return 0;
533 } else {
534 positive = (argv[*nextarg][0] == '+');
535 (*nextarg)++;
536 }
537 } else
538 positive = (symbol == '+');
539
540 /*
541 * Now there must be an offset!
542 */
543 if ((*nextarg > argc)
544 && (symbol == '\0')) {
545 return KDB_INVADDRFMT;
546 }
547
548 if (!symbol) {
549 cp = (char *)argv[*nextarg];
550 (*nextarg)++;
551 }
552
553 diag = kdbgetularg(cp, &off);
554 if (diag)
555 return diag;
556
557 if (!positive)
558 off = -off;
559
560 if (offset)
561 *offset += off;
562
563 if (value)
564 *value += off;
565
566 return 0;
567}
568
569static void kdb_cmderror(int diag)
570{
571 int i;
572
573 if (diag >= 0) {
574 kdb_printf("no error detected (diagnostic is %d)\n", diag);
575 return;
576 }
577
578 for (i = 0; i < __nkdb_err; i++) {
579 if (kdbmsgs[i].km_diag == diag) {
580 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
581 return;
582 }
583 }
584
585 kdb_printf("Unknown diag %d\n", -diag);
586}
587
588/*
589 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
590 * command which defines one command as a set of other commands,
591 * terminated by endefcmd. kdb_defcmd processes the initial
592 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
593 * the following commands until 'endefcmd'.
594 * Inputs:
595 * argc argument count
596 * argv argument vector
597 * Returns:
598 * zero for success, a kdb diagnostic if error
599 */
600struct defcmd_set {
601 int count;
602 int usable;
603 char *name;
604 char *usage;
605 char *help;
606 char **command;
607};
608static struct defcmd_set *defcmd_set;
609static int defcmd_set_count;
610static int defcmd_in_progress;
611
612/* Forward references */
613static int kdb_exec_defcmd(int argc, const char **argv);
614
615static int kdb_defcmd2(const char *cmdstr, const char *argv0)
616{
617 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
618 char **save_command = s->command;
619 if (strcmp(argv0, "endefcmd") == 0) {
620 defcmd_in_progress = 0;
621 if (!s->count)
622 s->usable = 0;
623 if (s->usable)
624 kdb_register(s->name, kdb_exec_defcmd,
625 s->usage, s->help, 0);
626 return 0;
627 }
628 if (!s->usable)
629 return KDB_NOTIMP;
630 s->command = kmalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
631 if (!s->command) {
632 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
633 cmdstr);
634 s->usable = 0;
635 return KDB_NOTIMP;
636 }
637 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
638 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
639 kfree(save_command);
640 return 0;
641}
642
643static int kdb_defcmd(int argc, const char **argv)
644{
645 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
646 if (defcmd_in_progress) {
647 kdb_printf("kdb: nested defcmd detected, assuming missing "
648 "endefcmd\n");
649 kdb_defcmd2("endefcmd", "endefcmd");
650 }
651 if (argc == 0) {
652 int i;
653 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
654 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
655 s->usage, s->help);
656 for (i = 0; i < s->count; ++i)
657 kdb_printf("%s", s->command[i]);
658 kdb_printf("endefcmd\n");
659 }
660 return 0;
661 }
662 if (argc != 3)
663 return KDB_ARGCOUNT;
664 defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
665 GFP_KDB);
666 if (!defcmd_set) {
667 kdb_printf("Could not allocate new defcmd_set entry for %s\n",
668 argv[1]);
669 defcmd_set = save_defcmd_set;
670 return KDB_NOTIMP;
671 }
672 memcpy(defcmd_set, save_defcmd_set,
673 defcmd_set_count * sizeof(*defcmd_set));
674 kfree(save_defcmd_set);
675 s = defcmd_set + defcmd_set_count;
676 memset(s, 0, sizeof(*s));
677 s->usable = 1;
678 s->name = kdb_strdup(argv[1], GFP_KDB);
679 s->usage = kdb_strdup(argv[2], GFP_KDB);
680 s->help = kdb_strdup(argv[3], GFP_KDB);
681 if (s->usage[0] == '"') {
682 strcpy(s->usage, s->usage+1);
683 s->usage[strlen(s->usage)-1] = '\0';
684 }
685 if (s->help[0] == '"') {
686 strcpy(s->help, s->help+1);
687 s->help[strlen(s->help)-1] = '\0';
688 }
689 ++defcmd_set_count;
690 defcmd_in_progress = 1;
691 return 0;
692}
693
694/*
695 * kdb_exec_defcmd - Execute the set of commands associated with this
696 * defcmd name.
697 * Inputs:
698 * argc argument count
699 * argv argument vector
700 * Returns:
701 * zero for success, a kdb diagnostic if error
702 */
703static int kdb_exec_defcmd(int argc, const char **argv)
704{
705 int i, ret;
706 struct defcmd_set *s;
707 if (argc != 0)
708 return KDB_ARGCOUNT;
709 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
710 if (strcmp(s->name, argv[0]) == 0)
711 break;
712 }
713 if (i == defcmd_set_count) {
714 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
715 argv[0]);
716 return KDB_NOTIMP;
717 }
718 for (i = 0; i < s->count; ++i) {
719 /* Recursive use of kdb_parse, do not use argv after
720 * this point */
721 argv = NULL;
722 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
723 ret = kdb_parse(s->command[i]);
724 if (ret)
725 return ret;
726 }
727 return 0;
728}
729
730/* Command history */
731#define KDB_CMD_HISTORY_COUNT 32
732#define CMD_BUFLEN 200 /* kdb_printf: max printline
733 * size == 256 */
734static unsigned int cmd_head, cmd_tail;
735static unsigned int cmdptr;
736static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
737static char cmd_cur[CMD_BUFLEN];
738
739/*
740 * The "str" argument may point to something like | grep xyz
741 */
742static void parse_grep(const char *str)
743{
744 int len;
745 char *cp = (char *)str, *cp2;
746
747 /* sanity check: we should have been called with the \ first */
748 if (*cp != '|')
749 return;
750 cp++;
751 while (isspace(*cp))
752 cp++;
753 if (strncmp(cp, "grep ", 5)) {
754 kdb_printf("invalid 'pipe', see grephelp\n");
755 return;
756 }
757 cp += 5;
758 while (isspace(*cp))
759 cp++;
760 cp2 = strchr(cp, '\n');
761 if (cp2)
762 *cp2 = '\0'; /* remove the trailing newline */
763 len = strlen(cp);
764 if (len == 0) {
765 kdb_printf("invalid 'pipe', see grephelp\n");
766 return;
767 }
768 /* now cp points to a nonzero length search string */
769 if (*cp == '"') {
770 /* allow it be "x y z" by removing the "'s - there must
771 be two of them */
772 cp++;
773 cp2 = strchr(cp, '"');
774 if (!cp2) {
775 kdb_printf("invalid quoted string, see grephelp\n");
776 return;
777 }
778 *cp2 = '\0'; /* end the string where the 2nd " was */
779 }
780 kdb_grep_leading = 0;
781 if (*cp == '^') {
782 kdb_grep_leading = 1;
783 cp++;
784 }
785 len = strlen(cp);
786 kdb_grep_trailing = 0;
787 if (*(cp+len-1) == '$') {
788 kdb_grep_trailing = 1;
789 *(cp+len-1) = '\0';
790 }
791 len = strlen(cp);
792 if (!len)
793 return;
794 if (len >= GREP_LEN) {
795 kdb_printf("search string too long\n");
796 return;
797 }
798 strcpy(kdb_grep_string, cp);
799 kdb_grepping_flag++;
800 return;
801}
802
803/*
804 * kdb_parse - Parse the command line, search the command table for a
805 * matching command and invoke the command function. This
806 * function may be called recursively, if it is, the second call
807 * will overwrite argv and cbuf. It is the caller's
808 * responsibility to save their argv if they recursively call
809 * kdb_parse().
810 * Parameters:
811 * cmdstr The input command line to be parsed.
812 * regs The registers at the time kdb was entered.
813 * Returns:
814 * Zero for success, a kdb diagnostic if failure.
815 * Remarks:
816 * Limited to 20 tokens.
817 *
818 * Real rudimentary tokenization. Basically only whitespace
819 * is considered a token delimeter (but special consideration
820 * is taken of the '=' sign as used by the 'set' command).
821 *
822 * The algorithm used to tokenize the input string relies on
823 * there being at least one whitespace (or otherwise useless)
824 * character between tokens as the character immediately following
825 * the token is altered in-place to a null-byte to terminate the
826 * token string.
827 */
828
829#define MAXARGC 20
830
831int kdb_parse(const char *cmdstr)
832{
833 static char *argv[MAXARGC];
834 static int argc;
835 static char cbuf[CMD_BUFLEN+2];
836 char *cp;
837 char *cpp, quoted;
838 kdbtab_t *tp;
839 int i, escaped, ignore_errors = 0, check_grep;
840
841 /*
842 * First tokenize the command string.
843 */
844 cp = (char *)cmdstr;
845 kdb_grepping_flag = check_grep = 0;
846
847 if (KDB_FLAG(CMD_INTERRUPT)) {
848 /* Previous command was interrupted, newline must not
849 * repeat the command */
850 KDB_FLAG_CLEAR(CMD_INTERRUPT);
851 KDB_STATE_SET(PAGER);
852 argc = 0; /* no repeat */
853 }
854
855 if (*cp != '\n' && *cp != '\0') {
856 argc = 0;
857 cpp = cbuf;
858 while (*cp) {
859 /* skip whitespace */
860 while (isspace(*cp))
861 cp++;
862 if ((*cp == '\0') || (*cp == '\n') ||
863 (*cp == '#' && !defcmd_in_progress))
864 break;
865 /* special case: check for | grep pattern */
866 if (*cp == '|') {
867 check_grep++;
868 break;
869 }
870 if (cpp >= cbuf + CMD_BUFLEN) {
871 kdb_printf("kdb_parse: command buffer "
872 "overflow, command ignored\n%s\n",
873 cmdstr);
874 return KDB_NOTFOUND;
875 }
876 if (argc >= MAXARGC - 1) {
877 kdb_printf("kdb_parse: too many arguments, "
878 "command ignored\n%s\n", cmdstr);
879 return KDB_NOTFOUND;
880 }
881 argv[argc++] = cpp;
882 escaped = 0;
883 quoted = '\0';
884 /* Copy to next unquoted and unescaped
885 * whitespace or '=' */
886 while (*cp && *cp != '\n' &&
887 (escaped || quoted || !isspace(*cp))) {
888 if (cpp >= cbuf + CMD_BUFLEN)
889 break;
890 if (escaped) {
891 escaped = 0;
892 *cpp++ = *cp++;
893 continue;
894 }
895 if (*cp == '\\') {
896 escaped = 1;
897 ++cp;
898 continue;
899 }
900 if (*cp == quoted)
901 quoted = '\0';
902 else if (*cp == '\'' || *cp == '"')
903 quoted = *cp;
904 *cpp = *cp++;
905 if (*cpp == '=' && !quoted)
906 break;
907 ++cpp;
908 }
909 *cpp++ = '\0'; /* Squash a ws or '=' character */
910 }
911 }
912 if (!argc)
913 return 0;
914 if (check_grep)
915 parse_grep(cp);
916 if (defcmd_in_progress) {
917 int result = kdb_defcmd2(cmdstr, argv[0]);
918 if (!defcmd_in_progress) {
919 argc = 0; /* avoid repeat on endefcmd */
920 *(argv[0]) = '\0';
921 }
922 return result;
923 }
924 if (argv[0][0] == '-' && argv[0][1] &&
925 (argv[0][1] < '0' || argv[0][1] > '9')) {
926 ignore_errors = 1;
927 ++argv[0];
928 }
929
930 for_each_kdbcmd(tp, i) {
931 if (tp->cmd_name) {
932 /*
933 * If this command is allowed to be abbreviated,
934 * check to see if this is it.
935 */
936
937 if (tp->cmd_minlen
938 && (strlen(argv[0]) <= tp->cmd_minlen)) {
939 if (strncmp(argv[0],
940 tp->cmd_name,
941 tp->cmd_minlen) == 0) {
942 break;
943 }
944 }
945
946 if (strcmp(argv[0], tp->cmd_name) == 0)
947 break;
948 }
949 }
950
951 /*
952 * If we don't find a command by this name, see if the first
953 * few characters of this match any of the known commands.
954 * e.g., md1c20 should match md.
955 */
956 if (i == kdb_max_commands) {
957 for_each_kdbcmd(tp, i) {
958 if (tp->cmd_name) {
959 if (strncmp(argv[0],
960 tp->cmd_name,
961 strlen(tp->cmd_name)) == 0) {
962 break;
963 }
964 }
965 }
966 }
967
968 if (i < kdb_max_commands) {
969 int result;
970 KDB_STATE_SET(CMD);
971 result = (*tp->cmd_func)(argc-1, (const char **)argv);
972 if (result && ignore_errors && result > KDB_CMD_GO)
973 result = 0;
974 KDB_STATE_CLEAR(CMD);
975 switch (tp->cmd_repeat) {
976 case KDB_REPEAT_NONE:
977 argc = 0;
978 if (argv[0])
979 *(argv[0]) = '\0';
980 break;
981 case KDB_REPEAT_NO_ARGS:
982 argc = 1;
983 if (argv[1])
984 *(argv[1]) = '\0';
985 break;
986 case KDB_REPEAT_WITH_ARGS:
987 break;
988 }
989 return result;
990 }
991
992 /*
993 * If the input with which we were presented does not
994 * map to an existing command, attempt to parse it as an
995 * address argument and display the result. Useful for
996 * obtaining the address of a variable, or the nearest symbol
997 * to an address contained in a register.
998 */
999 {
1000 unsigned long value;
1001 char *name = NULL;
1002 long offset;
1003 int nextarg = 0;
1004
1005 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1006 &value, &offset, &name)) {
1007 return KDB_NOTFOUND;
1008 }
1009
1010 kdb_printf("%s = ", argv[0]);
1011 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1012 kdb_printf("\n");
1013 return 0;
1014 }
1015}
1016
1017
1018static int handle_ctrl_cmd(char *cmd)
1019{
1020#define CTRL_P 16
1021#define CTRL_N 14
1022
1023 /* initial situation */
1024 if (cmd_head == cmd_tail)
1025 return 0;
1026 switch (*cmd) {
1027 case CTRL_P:
1028 if (cmdptr != cmd_tail)
1029 cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
1030 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1031 return 1;
1032 case CTRL_N:
1033 if (cmdptr != cmd_head)
1034 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1035 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1036 return 1;
1037 }
1038 return 0;
1039}
1040
1041/*
1042 * kdb_reboot - This function implements the 'reboot' command. Reboot
1043 * the system immediately, or loop for ever on failure.
1044 */
1045static int kdb_reboot(int argc, const char **argv)
1046{
1047 emergency_restart();
1048 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1049 while (1)
1050 cpu_relax();
1051 /* NOTREACHED */
1052 return 0;
1053}
1054
1055static void kdb_dumpregs(struct pt_regs *regs)
1056{
1057 int old_lvl = console_loglevel;
1058 console_loglevel = 15;
1059 kdb_trap_printk++;
1060 show_regs(regs);
1061 kdb_trap_printk--;
1062 kdb_printf("\n");
1063 console_loglevel = old_lvl;
1064}
1065
1066void kdb_set_current_task(struct task_struct *p)
1067{
1068 kdb_current_task = p;
1069
1070 if (kdb_task_has_cpu(p)) {
1071 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1072 return;
1073 }
1074 kdb_current_regs = NULL;
1075}
1076
1077/*
1078 * kdb_local - The main code for kdb. This routine is invoked on a
1079 * specific processor, it is not global. The main kdb() routine
1080 * ensures that only one processor at a time is in this routine.
1081 * This code is called with the real reason code on the first
1082 * entry to a kdb session, thereafter it is called with reason
1083 * SWITCH, even if the user goes back to the original cpu.
1084 * Inputs:
1085 * reason The reason KDB was invoked
1086 * error The hardware-defined error code
1087 * regs The exception frame at time of fault/breakpoint.
1088 * db_result Result code from the break or debug point.
1089 * Returns:
1090 * 0 KDB was invoked for an event which it wasn't responsible
1091 * 1 KDB handled the event for which it was invoked.
1092 * KDB_CMD_GO User typed 'go'.
1093 * KDB_CMD_CPU User switched to another cpu.
1094 * KDB_CMD_SS Single step.
1095 * KDB_CMD_SSB Single step until branch.
1096 */
1097static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1098 kdb_dbtrap_t db_result)
1099{
1100 char *cmdbuf;
1101 int diag;
1102 struct task_struct *kdb_current =
1103 kdb_curr_task(raw_smp_processor_id());
1104
1105 KDB_DEBUG_STATE("kdb_local 1", reason);
1106 kdb_go_count = 0;
1107 if (reason == KDB_REASON_DEBUG) {
1108 /* special case below */
1109 } else {
1110 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1111 kdb_current, kdb_current->pid);
1112#if defined(CONFIG_SMP)
1113 kdb_printf("on processor %d ", raw_smp_processor_id());
1114#endif
1115 }
1116
1117 switch (reason) {
1118 case KDB_REASON_DEBUG:
1119 {
1120 /*
1121 * If re-entering kdb after a single step
1122 * command, don't print the message.
1123 */
1124 switch (db_result) {
1125 case KDB_DB_BPT:
1126 kdb_printf("\nEntering kdb (0x%p, pid %d) ",
1127 kdb_current, kdb_current->pid);
1128#if defined(CONFIG_SMP)
1129 kdb_printf("on processor %d ", raw_smp_processor_id());
1130#endif
1131 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1132 instruction_pointer(regs));
1133 break;
1134 case KDB_DB_SSB:
1135 /*
1136 * In the midst of ssb command. Just return.
1137 */
1138 KDB_DEBUG_STATE("kdb_local 3", reason);
1139 return KDB_CMD_SSB; /* Continue with SSB command */
1140
1141 break;
1142 case KDB_DB_SS:
1143 break;
1144 case KDB_DB_SSBPT:
1145 KDB_DEBUG_STATE("kdb_local 4", reason);
1146 return 1; /* kdba_db_trap did the work */
1147 default:
1148 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1149 db_result);
1150 break;
1151 }
1152
1153 }
1154 break;
1155 case KDB_REASON_ENTER:
1156 if (KDB_STATE(KEYBOARD))
1157 kdb_printf("due to Keyboard Entry\n");
1158 else
1159 kdb_printf("due to KDB_ENTER()\n");
1160 break;
1161 case KDB_REASON_KEYBOARD:
1162 KDB_STATE_SET(KEYBOARD);
1163 kdb_printf("due to Keyboard Entry\n");
1164 break;
1165 case KDB_REASON_ENTER_SLAVE:
1166 /* drop through, slaves only get released via cpu switch */
1167 case KDB_REASON_SWITCH:
1168 kdb_printf("due to cpu switch\n");
1169 break;
1170 case KDB_REASON_OOPS:
1171 kdb_printf("Oops: %s\n", kdb_diemsg);
1172 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1173 instruction_pointer(regs));
1174 kdb_dumpregs(regs);
1175 break;
1176 case KDB_REASON_NMI:
1177 kdb_printf("due to NonMaskable Interrupt @ "
1178 kdb_machreg_fmt "\n",
1179 instruction_pointer(regs));
1180 kdb_dumpregs(regs);
1181 break;
1182 case KDB_REASON_SSTEP:
1183 case KDB_REASON_BREAK:
1184 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1185 reason == KDB_REASON_BREAK ?
1186 "Breakpoint" : "SS trap", instruction_pointer(regs));
1187 /*
1188 * Determine if this breakpoint is one that we
1189 * are interested in.
1190 */
1191 if (db_result != KDB_DB_BPT) {
1192 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1193 db_result);
1194 KDB_DEBUG_STATE("kdb_local 6", reason);
1195 return 0; /* Not for us, dismiss it */
1196 }
1197 break;
1198 case KDB_REASON_RECURSE:
1199 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1200 instruction_pointer(regs));
1201 break;
1202 default:
1203 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1204 KDB_DEBUG_STATE("kdb_local 8", reason);
1205 return 0; /* Not for us, dismiss it */
1206 }
1207
1208 while (1) {
1209 /*
1210 * Initialize pager context.
1211 */
1212 kdb_nextline = 1;
1213 KDB_STATE_CLEAR(SUPPRESS);
1214
1215 cmdbuf = cmd_cur;
1216 *cmdbuf = '\0';
1217 *(cmd_hist[cmd_head]) = '\0';
1218
1219 if (KDB_FLAG(ONLY_DO_DUMP)) {
1220 /* kdb is off but a catastrophic error requires a dump.
1221 * Take the dump and reboot.
1222 * Turn on logging so the kdb output appears in the log
1223 * buffer in the dump.
1224 */
1225 const char *setargs[] = { "set", "LOGGING", "1" };
1226 kdb_set(2, setargs);
1227 kdb_reboot(0, NULL);
1228 /*NOTREACHED*/
1229 }
1230
1231do_full_getstr:
1232#if defined(CONFIG_SMP)
1233 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1234 raw_smp_processor_id());
1235#else
1236 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
1237#endif
1238 if (defcmd_in_progress)
1239 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1240
1241 /*
1242 * Fetch command from keyboard
1243 */
1244 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1245 if (*cmdbuf != '\n') {
1246 if (*cmdbuf < 32) {
1247 if (cmdptr == cmd_head) {
1248 strncpy(cmd_hist[cmd_head], cmd_cur,
1249 CMD_BUFLEN);
1250 *(cmd_hist[cmd_head] +
1251 strlen(cmd_hist[cmd_head])-1) = '\0';
1252 }
1253 if (!handle_ctrl_cmd(cmdbuf))
1254 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1255 cmdbuf = cmd_cur;
1256 goto do_full_getstr;
1257 } else {
1258 strncpy(cmd_hist[cmd_head], cmd_cur,
1259 CMD_BUFLEN);
1260 }
1261
1262 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1263 if (cmd_head == cmd_tail)
1264 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1265 }
1266
1267 cmdptr = cmd_head;
1268 diag = kdb_parse(cmdbuf);
1269 if (diag == KDB_NOTFOUND) {
1270 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1271 diag = 0;
1272 }
1273 if (diag == KDB_CMD_GO
1274 || diag == KDB_CMD_CPU
1275 || diag == KDB_CMD_SS
1276 || diag == KDB_CMD_SSB
1277 || diag == KDB_CMD_KGDB)
1278 break;
1279
1280 if (diag)
1281 kdb_cmderror(diag);
1282 }
1283 KDB_DEBUG_STATE("kdb_local 9", diag);
1284 return diag;
1285}
1286
1287
1288/*
1289 * kdb_print_state - Print the state data for the current processor
1290 * for debugging.
1291 * Inputs:
1292 * text Identifies the debug point
1293 * value Any integer value to be printed, e.g. reason code.
1294 */
1295void kdb_print_state(const char *text, int value)
1296{
1297 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1298 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1299 kdb_state);
1300}
1301
1302/*
1303 * kdb_main_loop - After initial setup and assignment of the
1304 * controlling cpu, all cpus are in this loop. One cpu is in
1305 * control and will issue the kdb prompt, the others will spin
1306 * until 'go' or cpu switch.
1307 *
1308 * To get a consistent view of the kernel stacks for all
1309 * processes, this routine is invoked from the main kdb code via
1310 * an architecture specific routine. kdba_main_loop is
1311 * responsible for making the kernel stacks consistent for all
1312 * processes, there should be no difference between a blocked
1313 * process and a running process as far as kdb is concerned.
1314 * Inputs:
1315 * reason The reason KDB was invoked
1316 * error The hardware-defined error code
1317 * reason2 kdb's current reason code.
1318 * Initially error but can change
1319 * acording to kdb state.
1320 * db_result Result code from break or debug point.
1321 * regs The exception frame at time of fault/breakpoint.
1322 * should always be valid.
1323 * Returns:
1324 * 0 KDB was invoked for an event which it wasn't responsible
1325 * 1 KDB handled the event for which it was invoked.
1326 */
1327int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1328 kdb_dbtrap_t db_result, struct pt_regs *regs)
1329{
1330 int result = 1;
1331 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1332 while (1) {
1333 /*
1334 * All processors except the one that is in control
1335 * will spin here.
1336 */
1337 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1338 while (KDB_STATE(HOLD_CPU)) {
1339 /* state KDB is turned off by kdb_cpu to see if the
1340 * other cpus are still live, each cpu in this loop
1341 * turns it back on.
1342 */
1343 if (!KDB_STATE(KDB))
1344 KDB_STATE_SET(KDB);
1345 }
1346
1347 KDB_STATE_CLEAR(SUPPRESS);
1348 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1349 if (KDB_STATE(LEAVING))
1350 break; /* Another cpu said 'go' */
1351 /* Still using kdb, this processor is in control */
1352 result = kdb_local(reason2, error, regs, db_result);
1353 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1354
1355 if (result == KDB_CMD_CPU)
1356 break;
1357
1358 if (result == KDB_CMD_SS) {
1359 KDB_STATE_SET(DOING_SS);
1360 break;
1361 }
1362
1363 if (result == KDB_CMD_SSB) {
1364 KDB_STATE_SET(DOING_SS);
1365 KDB_STATE_SET(DOING_SSB);
1366 break;
1367 }
1368
1369 if (result == KDB_CMD_KGDB) {
1370 if (!(KDB_STATE(DOING_KGDB) || KDB_STATE(DOING_KGDB2)))
1371 kdb_printf("Entering please attach debugger "
1372 "or use $D#44+ or $3#33\n");
1373 break;
1374 }
1375 if (result && result != 1 && result != KDB_CMD_GO)
1376 kdb_printf("\nUnexpected kdb_local return code %d\n",
1377 result);
1378 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1379 break;
1380 }
1381 if (KDB_STATE(DOING_SS))
1382 KDB_STATE_CLEAR(SSBPT);
1383
1384 return result;
1385}
1386
1387/*
1388 * kdb_mdr - This function implements the guts of the 'mdr', memory
1389 * read command.
1390 * mdr <addr arg>,<byte count>
1391 * Inputs:
1392 * addr Start address
1393 * count Number of bytes
1394 * Returns:
1395 * Always 0. Any errors are detected and printed by kdb_getarea.
1396 */
1397static int kdb_mdr(unsigned long addr, unsigned int count)
1398{
1399 unsigned char c;
1400 while (count--) {
1401 if (kdb_getarea(c, addr))
1402 return 0;
1403 kdb_printf("%02x", c);
1404 addr++;
1405 }
1406 kdb_printf("\n");
1407 return 0;
1408}
1409
1410/*
1411 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1412 * 'md8' 'mdr' and 'mds' commands.
1413 *
1414 * md|mds [<addr arg> [<line count> [<radix>]]]
1415 * mdWcN [<addr arg> [<line count> [<radix>]]]
1416 * where W = is the width (1, 2, 4 or 8) and N is the count.
1417 * for eg., md1c20 reads 20 bytes, 1 at a time.
1418 * mdr <addr arg>,<byte count>
1419 */
1420static void kdb_md_line(const char *fmtstr, unsigned long addr,
1421 int symbolic, int nosect, int bytesperword,
1422 int num, int repeat, int phys)
1423{
1424 /* print just one line of data */
1425 kdb_symtab_t symtab;
1426 char cbuf[32];
1427 char *c = cbuf;
1428 int i;
1429 unsigned long word;
1430
1431 memset(cbuf, '\0', sizeof(cbuf));
1432 if (phys)
1433 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1434 else
1435 kdb_printf(kdb_machreg_fmt0 " ", addr);
1436
1437 for (i = 0; i < num && repeat--; i++) {
1438 if (phys) {
1439 if (kdb_getphysword(&word, addr, bytesperword))
1440 break;
1441 } else if (kdb_getword(&word, addr, bytesperword))
1442 break;
1443 kdb_printf(fmtstr, word);
1444 if (symbolic)
1445 kdbnearsym(word, &symtab);
1446 else
1447 memset(&symtab, 0, sizeof(symtab));
1448 if (symtab.sym_name) {
1449 kdb_symbol_print(word, &symtab, 0);
1450 if (!nosect) {
1451 kdb_printf("\n");
1452 kdb_printf(" %s %s "
1453 kdb_machreg_fmt " "
1454 kdb_machreg_fmt " "
1455 kdb_machreg_fmt, symtab.mod_name,
1456 symtab.sec_name, symtab.sec_start,
1457 symtab.sym_start, symtab.sym_end);
1458 }
1459 addr += bytesperword;
1460 } else {
1461 union {
1462 u64 word;
1463 unsigned char c[8];
1464 } wc;
1465 unsigned char *cp;
1466#ifdef __BIG_ENDIAN
1467 cp = wc.c + 8 - bytesperword;
1468#else
1469 cp = wc.c;
1470#endif
1471 wc.word = word;
1472#define printable_char(c) \
1473 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1474 switch (bytesperword) {
1475 case 8:
1476 *c++ = printable_char(*cp++);
1477 *c++ = printable_char(*cp++);
1478 *c++ = printable_char(*cp++);
1479 *c++ = printable_char(*cp++);
1480 addr += 4;
1481 case 4:
1482 *c++ = printable_char(*cp++);
1483 *c++ = printable_char(*cp++);
1484 addr += 2;
1485 case 2:
1486 *c++ = printable_char(*cp++);
1487 addr++;
1488 case 1:
1489 *c++ = printable_char(*cp++);
1490 addr++;
1491 break;
1492 }
1493#undef printable_char
1494 }
1495 }
1496 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1497 " ", cbuf);
1498}
1499
1500static int kdb_md(int argc, const char **argv)
1501{
1502 static unsigned long last_addr;
1503 static int last_radix, last_bytesperword, last_repeat;
1504 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1505 int nosect = 0;
1506 char fmtchar, fmtstr[64];
1507 unsigned long addr;
1508 unsigned long word;
1509 long offset = 0;
1510 int symbolic = 0;
1511 int valid = 0;
1512 int phys = 0;
1513
1514 kdbgetintenv("MDCOUNT", &mdcount);
1515 kdbgetintenv("RADIX", &radix);
1516 kdbgetintenv("BYTESPERWORD", &bytesperword);
1517
1518 /* Assume 'md <addr>' and start with environment values */
1519 repeat = mdcount * 16 / bytesperword;
1520
1521 if (strcmp(argv[0], "mdr") == 0) {
1522 if (argc != 2)
1523 return KDB_ARGCOUNT;
1524 valid = 1;
1525 } else if (isdigit(argv[0][2])) {
1526 bytesperword = (int)(argv[0][2] - '0');
1527 if (bytesperword == 0) {
1528 bytesperword = last_bytesperword;
1529 if (bytesperword == 0)
1530 bytesperword = 4;
1531 }
1532 last_bytesperword = bytesperword;
1533 repeat = mdcount * 16 / bytesperword;
1534 if (!argv[0][3])
1535 valid = 1;
1536 else if (argv[0][3] == 'c' && argv[0][4]) {
1537 char *p;
1538 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1539 mdcount = ((repeat * bytesperword) + 15) / 16;
1540 valid = !*p;
1541 }
1542 last_repeat = repeat;
1543 } else if (strcmp(argv[0], "md") == 0)
1544 valid = 1;
1545 else if (strcmp(argv[0], "mds") == 0)
1546 valid = 1;
1547 else if (strcmp(argv[0], "mdp") == 0) {
1548 phys = valid = 1;
1549 }
1550 if (!valid)
1551 return KDB_NOTFOUND;
1552
1553 if (argc == 0) {
1554 if (last_addr == 0)
1555 return KDB_ARGCOUNT;
1556 addr = last_addr;
1557 radix = last_radix;
1558 bytesperword = last_bytesperword;
1559 repeat = last_repeat;
1560 mdcount = ((repeat * bytesperword) + 15) / 16;
1561 }
1562
1563 if (argc) {
1564 unsigned long val;
1565 int diag, nextarg = 1;
1566 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1567 &offset, NULL);
1568 if (diag)
1569 return diag;
1570 if (argc > nextarg+2)
1571 return KDB_ARGCOUNT;
1572
1573 if (argc >= nextarg) {
1574 diag = kdbgetularg(argv[nextarg], &val);
1575 if (!diag) {
1576 mdcount = (int) val;
1577 repeat = mdcount * 16 / bytesperword;
1578 }
1579 }
1580 if (argc >= nextarg+1) {
1581 diag = kdbgetularg(argv[nextarg+1], &val);
1582 if (!diag)
1583 radix = (int) val;
1584 }
1585 }
1586
1587 if (strcmp(argv[0], "mdr") == 0)
1588 return kdb_mdr(addr, mdcount);
1589
1590 switch (radix) {
1591 case 10:
1592 fmtchar = 'd';
1593 break;
1594 case 16:
1595 fmtchar = 'x';
1596 break;
1597 case 8:
1598 fmtchar = 'o';
1599 break;
1600 default:
1601 return KDB_BADRADIX;
1602 }
1603
1604 last_radix = radix;
1605
1606 if (bytesperword > KDB_WORD_SIZE)
1607 return KDB_BADWIDTH;
1608
1609 switch (bytesperword) {
1610 case 8:
1611 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1612 break;
1613 case 4:
1614 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1615 break;
1616 case 2:
1617 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1618 break;
1619 case 1:
1620 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1621 break;
1622 default:
1623 return KDB_BADWIDTH;
1624 }
1625
1626 last_repeat = repeat;
1627 last_bytesperword = bytesperword;
1628
1629 if (strcmp(argv[0], "mds") == 0) {
1630 symbolic = 1;
1631 /* Do not save these changes as last_*, they are temporary mds
1632 * overrides.
1633 */
1634 bytesperword = KDB_WORD_SIZE;
1635 repeat = mdcount;
1636 kdbgetintenv("NOSECT", &nosect);
1637 }
1638
1639 /* Round address down modulo BYTESPERWORD */
1640
1641 addr &= ~(bytesperword-1);
1642
1643 while (repeat > 0) {
1644 unsigned long a;
1645 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1646
1647 if (KDB_FLAG(CMD_INTERRUPT))
1648 return 0;
1649 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1650 if (phys) {
1651 if (kdb_getphysword(&word, a, bytesperword)
1652 || word)
1653 break;
1654 } else if (kdb_getword(&word, a, bytesperword) || word)
1655 break;
1656 }
1657 n = min(num, repeat);
1658 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1659 num, repeat, phys);
1660 addr += bytesperword * n;
1661 repeat -= n;
1662 z = (z + num - 1) / num;
1663 if (z > 2) {
1664 int s = num * (z-2);
1665 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1666 " zero suppressed\n",
1667 addr, addr + bytesperword * s - 1);
1668 addr += bytesperword * s;
1669 repeat -= s;
1670 }
1671 }
1672 last_addr = addr;
1673
1674 return 0;
1675}
1676
1677/*
1678 * kdb_mm - This function implements the 'mm' command.
1679 * mm address-expression new-value
1680 * Remarks:
1681 * mm works on machine words, mmW works on bytes.
1682 */
1683static int kdb_mm(int argc, const char **argv)
1684{
1685 int diag;
1686 unsigned long addr;
1687 long offset = 0;
1688 unsigned long contents;
1689 int nextarg;
1690 int width;
1691
1692 if (argv[0][2] && !isdigit(argv[0][2]))
1693 return KDB_NOTFOUND;
1694
1695 if (argc < 2)
1696 return KDB_ARGCOUNT;
1697
1698 nextarg = 1;
1699 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1700 if (diag)
1701 return diag;
1702
1703 if (nextarg > argc)
1704 return KDB_ARGCOUNT;
1705 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1706 if (diag)
1707 return diag;
1708
1709 if (nextarg != argc + 1)
1710 return KDB_ARGCOUNT;
1711
1712 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1713 diag = kdb_putword(addr, contents, width);
1714 if (diag)
1715 return diag;
1716
1717 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1718
1719 return 0;
1720}
1721
1722/*
1723 * kdb_go - This function implements the 'go' command.
1724 * go [address-expression]
1725 */
1726static int kdb_go(int argc, const char **argv)
1727{
1728 unsigned long addr;
1729 int diag;
1730 int nextarg;
1731 long offset;
1732
1733 if (argc == 1) {
1734 if (raw_smp_processor_id() != kdb_initial_cpu) {
1735 kdb_printf("go <address> must be issued from the "
1736 "initial cpu, do cpu %d first\n",
1737 kdb_initial_cpu);
1738 return KDB_ARGCOUNT;
1739 }
1740 nextarg = 1;
1741 diag = kdbgetaddrarg(argc, argv, &nextarg,
1742 &addr, &offset, NULL);
1743 if (diag)
1744 return diag;
1745 } else if (argc) {
1746 return KDB_ARGCOUNT;
1747 }
1748
1749 diag = KDB_CMD_GO;
1750 if (KDB_FLAG(CATASTROPHIC)) {
1751 kdb_printf("Catastrophic error detected\n");
1752 kdb_printf("kdb_continue_catastrophic=%d, ",
1753 kdb_continue_catastrophic);
1754 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1755 kdb_printf("type go a second time if you really want "
1756 "to continue\n");
1757 return 0;
1758 }
1759 if (kdb_continue_catastrophic == 2) {
1760 kdb_printf("forcing reboot\n");
1761 kdb_reboot(0, NULL);
1762 }
1763 kdb_printf("attempting to continue\n");
1764 }
1765 return diag;
1766}
1767
1768/*
1769 * kdb_rd - This function implements the 'rd' command.
1770 */
1771static int kdb_rd(int argc, const char **argv)
1772{
1773 int diag = kdb_check_regs();
1774 if (diag)
1775 return diag;
1776
1777 kdb_dumpregs(kdb_current_regs);
1778 return 0;
1779}
1780
1781/*
1782 * kdb_rm - This function implements the 'rm' (register modify) command.
1783 * rm register-name new-contents
1784 * Remarks:
1785 * Currently doesn't allow modification of control or
1786 * debug registers.
1787 */
1788static int kdb_rm(int argc, const char **argv)
1789{
1790 int diag;
1791 int ind = 0;
1792 unsigned long contents;
1793
1794 if (argc != 2)
1795 return KDB_ARGCOUNT;
1796 /*
1797 * Allow presence or absence of leading '%' symbol.
1798 */
1799 if (argv[1][0] == '%')
1800 ind = 1;
1801
1802 diag = kdbgetularg(argv[2], &contents);
1803 if (diag)
1804 return diag;
1805
1806 diag = kdb_check_regs();
1807 if (diag)
1808 return diag;
1809 kdb_printf("ERROR: Register set currently not implemented\n");
1810 return 0;
1811}
1812
1813#if defined(CONFIG_MAGIC_SYSRQ)
1814/*
1815 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1816 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1817 * sr <magic-sysrq-code>
1818 */
1819static int kdb_sr(int argc, const char **argv)
1820{
1821 if (argc != 1)
1822 return KDB_ARGCOUNT;
1823 sysrq_toggle_support(1);
1824 kdb_trap_printk++;
1825 handle_sysrq(*argv[1], NULL);
1826 kdb_trap_printk--;
1827
1828 return 0;
1829}
1830#endif /* CONFIG_MAGIC_SYSRQ */
1831
1832/*
1833 * kdb_ef - This function implements the 'regs' (display exception
1834 * frame) command. This command takes an address and expects to
1835 * find an exception frame at that address, formats and prints
1836 * it.
1837 * regs address-expression
1838 * Remarks:
1839 * Not done yet.
1840 */
1841static int kdb_ef(int argc, const char **argv)
1842{
1843 int diag;
1844 unsigned long addr;
1845 long offset;
1846 int nextarg;
1847
1848 if (argc != 1)
1849 return KDB_ARGCOUNT;
1850
1851 nextarg = 1;
1852 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1853 if (diag)
1854 return diag;
1855 show_regs((struct pt_regs *)addr);
1856 return 0;
1857}
1858
1859#if defined(CONFIG_MODULES)
1860/* modules using other modules */
1861struct module_use {
1862 struct list_head list;
1863 struct module *module_which_uses;
1864};
1865
1866/*
1867 * kdb_lsmod - This function implements the 'lsmod' command. Lists
1868 * currently loaded kernel modules.
1869 * Mostly taken from userland lsmod.
1870 */
1871static int kdb_lsmod(int argc, const char **argv)
1872{
1873 struct module *mod;
1874
1875 if (argc != 0)
1876 return KDB_ARGCOUNT;
1877
1878 kdb_printf("Module Size modstruct Used by\n");
1879 list_for_each_entry(mod, kdb_modules, list) {
1880
1881 kdb_printf("%-20s%8u 0x%p ", mod->name,
1882 mod->core_size, (void *)mod);
1883#ifdef CONFIG_MODULE_UNLOAD
1884 kdb_printf("%4d ", module_refcount(mod));
1885#endif
1886 if (mod->state == MODULE_STATE_GOING)
1887 kdb_printf(" (Unloading)");
1888 else if (mod->state == MODULE_STATE_COMING)
1889 kdb_printf(" (Loading)");
1890 else
1891 kdb_printf(" (Live)");
1892
1893#ifdef CONFIG_MODULE_UNLOAD
1894 {
1895 struct module_use *use;
1896 kdb_printf(" [ ");
1897 list_for_each_entry(use, &mod->modules_which_use_me,
1898 list)
1899 kdb_printf("%s ", use->module_which_uses->name);
1900 kdb_printf("]\n");
1901 }
1902#endif
1903 }
1904
1905 return 0;
1906}
1907
1908#endif /* CONFIG_MODULES */
1909
1910/*
1911 * kdb_env - This function implements the 'env' command. Display the
1912 * current environment variables.
1913 */
1914
1915static int kdb_env(int argc, const char **argv)
1916{
1917 int i;
1918
1919 for (i = 0; i < __nenv; i++) {
1920 if (__env[i])
1921 kdb_printf("%s\n", __env[i]);
1922 }
1923
1924 if (KDB_DEBUG(MASK))
1925 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
1926
1927 return 0;
1928}
1929
1930#ifdef CONFIG_PRINTK
1931/*
1932 * kdb_dmesg - This function implements the 'dmesg' command to display
1933 * the contents of the syslog buffer.
1934 * dmesg [lines] [adjust]
1935 */
1936static int kdb_dmesg(int argc, const char **argv)
1937{
1938 char *syslog_data[4], *start, *end, c = '\0', *p;
1939 int diag, logging, logsize, lines = 0, adjust = 0, n;
1940
1941 if (argc > 2)
1942 return KDB_ARGCOUNT;
1943 if (argc) {
1944 char *cp;
1945 lines = simple_strtol(argv[1], &cp, 0);
1946 if (*cp)
1947 lines = 0;
1948 if (argc > 1) {
1949 adjust = simple_strtoul(argv[2], &cp, 0);
1950 if (*cp || adjust < 0)
1951 adjust = 0;
1952 }
1953 }
1954
1955 /* disable LOGGING if set */
1956 diag = kdbgetintenv("LOGGING", &logging);
1957 if (!diag && logging) {
1958 const char *setargs[] = { "set", "LOGGING", "0" };
1959 kdb_set(2, setargs);
1960 }
1961
1962 /* syslog_data[0,1] physical start, end+1. syslog_data[2,3]
1963 * logical start, end+1. */
1964 kdb_syslog_data(syslog_data);
1965 if (syslog_data[2] == syslog_data[3])
1966 return 0;
1967 logsize = syslog_data[1] - syslog_data[0];
1968 start = syslog_data[2];
1969 end = syslog_data[3];
1970#define KDB_WRAP(p) (((p - syslog_data[0]) % logsize) + syslog_data[0])
1971 for (n = 0, p = start; p < end; ++p) {
1972 c = *KDB_WRAP(p);
1973 if (c == '\n')
1974 ++n;
1975 }
1976 if (c != '\n')
1977 ++n;
1978 if (lines < 0) {
1979 if (adjust >= n)
1980 kdb_printf("buffer only contains %d lines, nothing "
1981 "printed\n", n);
1982 else if (adjust - lines >= n)
1983 kdb_printf("buffer only contains %d lines, last %d "
1984 "lines printed\n", n, n - adjust);
1985 if (adjust) {
1986 for (; start < end && adjust; ++start) {
1987 if (*KDB_WRAP(start) == '\n')
1988 --adjust;
1989 }
1990 if (start < end)
1991 ++start;
1992 }
1993 for (p = start; p < end && lines; ++p) {
1994 if (*KDB_WRAP(p) == '\n')
1995 ++lines;
1996 }
1997 end = p;
1998 } else if (lines > 0) {
1999 int skip = n - (adjust + lines);
2000 if (adjust >= n) {
2001 kdb_printf("buffer only contains %d lines, "
2002 "nothing printed\n", n);
2003 skip = n;
2004 } else if (skip < 0) {
2005 lines += skip;
2006 skip = 0;
2007 kdb_printf("buffer only contains %d lines, first "
2008 "%d lines printed\n", n, lines);
2009 }
2010 for (; start < end && skip; ++start) {
2011 if (*KDB_WRAP(start) == '\n')
2012 --skip;
2013 }
2014 for (p = start; p < end && lines; ++p) {
2015 if (*KDB_WRAP(p) == '\n')
2016 --lines;
2017 }
2018 end = p;
2019 }
2020 /* Do a line at a time (max 200 chars) to reduce protocol overhead */
2021 c = '\n';
2022 while (start != end) {
2023 char buf[201];
2024 p = buf;
2025 if (KDB_FLAG(CMD_INTERRUPT))
2026 return 0;
2027 while (start < end && (c = *KDB_WRAP(start)) &&
2028 (p - buf) < sizeof(buf)-1) {
2029 ++start;
2030 *p++ = c;
2031 if (c == '\n')
2032 break;
2033 }
2034 *p = '\0';
2035 kdb_printf("%s", buf);
2036 }
2037 if (c != '\n')
2038 kdb_printf("\n");
2039
2040 return 0;
2041}
2042#endif /* CONFIG_PRINTK */
2043/*
2044 * kdb_cpu - This function implements the 'cpu' command.
2045 * cpu [<cpunum>]
2046 * Returns:
2047 * KDB_CMD_CPU for success, a kdb diagnostic if error
2048 */
2049static void kdb_cpu_status(void)
2050{
2051 int i, start_cpu, first_print = 1;
2052 char state, prev_state = '?';
2053
2054 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2055 kdb_printf("Available cpus: ");
2056 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2057 if (!cpu_online(i)) {
2058 state = 'F'; /* cpu is offline */
2059 } else {
2060 state = ' '; /* cpu is responding to kdb */
2061 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2062 state = 'I'; /* idle task */
2063 }
2064 if (state != prev_state) {
2065 if (prev_state != '?') {
2066 if (!first_print)
2067 kdb_printf(", ");
2068 first_print = 0;
2069 kdb_printf("%d", start_cpu);
2070 if (start_cpu < i-1)
2071 kdb_printf("-%d", i-1);
2072 if (prev_state != ' ')
2073 kdb_printf("(%c)", prev_state);
2074 }
2075 prev_state = state;
2076 start_cpu = i;
2077 }
2078 }
2079 /* print the trailing cpus, ignoring them if they are all offline */
2080 if (prev_state != 'F') {
2081 if (!first_print)
2082 kdb_printf(", ");
2083 kdb_printf("%d", start_cpu);
2084 if (start_cpu < i-1)
2085 kdb_printf("-%d", i-1);
2086 if (prev_state != ' ')
2087 kdb_printf("(%c)", prev_state);
2088 }
2089 kdb_printf("\n");
2090}
2091
2092static int kdb_cpu(int argc, const char **argv)
2093{
2094 unsigned long cpunum;
2095 int diag;
2096
2097 if (argc == 0) {
2098 kdb_cpu_status();
2099 return 0;
2100 }
2101
2102 if (argc != 1)
2103 return KDB_ARGCOUNT;
2104
2105 diag = kdbgetularg(argv[1], &cpunum);
2106 if (diag)
2107 return diag;
2108
2109 /*
2110 * Validate cpunum
2111 */
2112 if ((cpunum > NR_CPUS) || !cpu_online(cpunum))
2113 return KDB_BADCPUNUM;
2114
2115 dbg_switch_cpu = cpunum;
2116
2117 /*
2118 * Switch to other cpu
2119 */
2120 return KDB_CMD_CPU;
2121}
2122
2123/* The user may not realize that ps/bta with no parameters does not print idle
2124 * or sleeping system daemon processes, so tell them how many were suppressed.
2125 */
2126void kdb_ps_suppressed(void)
2127{
2128 int idle = 0, daemon = 0;
2129 unsigned long mask_I = kdb_task_state_string("I"),
2130 mask_M = kdb_task_state_string("M");
2131 unsigned long cpu;
2132 const struct task_struct *p, *g;
2133 for_each_online_cpu(cpu) {
2134 p = kdb_curr_task(cpu);
2135 if (kdb_task_state(p, mask_I))
2136 ++idle;
2137 }
2138 kdb_do_each_thread(g, p) {
2139 if (kdb_task_state(p, mask_M))
2140 ++daemon;
2141 } kdb_while_each_thread(g, p);
2142 if (idle || daemon) {
2143 if (idle)
2144 kdb_printf("%d idle process%s (state I)%s\n",
2145 idle, idle == 1 ? "" : "es",
2146 daemon ? " and " : "");
2147 if (daemon)
2148 kdb_printf("%d sleeping system daemon (state M) "
2149 "process%s", daemon,
2150 daemon == 1 ? "" : "es");
2151 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2152 }
2153}
2154
2155/*
2156 * kdb_ps - This function implements the 'ps' command which shows a
2157 * list of the active processes.
2158 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2159 */
2160void kdb_ps1(const struct task_struct *p)
2161{
2162 int cpu;
2163 unsigned long tmp;
2164
2165 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
2166 return;
2167
2168 cpu = kdb_process_cpu(p);
2169 kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
2170 (void *)p, p->pid, p->parent->pid,
2171 kdb_task_has_cpu(p), kdb_process_cpu(p),
2172 kdb_task_state_char(p),
2173 (void *)(&p->thread),
2174 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2175 p->comm);
2176 if (kdb_task_has_cpu(p)) {
2177 if (!KDB_TSK(cpu)) {
2178 kdb_printf(" Error: no saved data for this cpu\n");
2179 } else {
2180 if (KDB_TSK(cpu) != p)
2181 kdb_printf(" Error: does not match running "
2182 "process table (0x%p)\n", KDB_TSK(cpu));
2183 }
2184 }
2185}
2186
2187static int kdb_ps(int argc, const char **argv)
2188{
2189 struct task_struct *g, *p;
2190 unsigned long mask, cpu;
2191
2192 if (argc == 0)
2193 kdb_ps_suppressed();
2194 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2195 (int)(2*sizeof(void *))+2, "Task Addr",
2196 (int)(2*sizeof(void *))+2, "Thread");
2197 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2198 /* Run the active tasks first */
2199 for_each_online_cpu(cpu) {
2200 if (KDB_FLAG(CMD_INTERRUPT))
2201 return 0;
2202 p = kdb_curr_task(cpu);
2203 if (kdb_task_state(p, mask))
2204 kdb_ps1(p);
2205 }
2206 kdb_printf("\n");
2207 /* Now the real tasks */
2208 kdb_do_each_thread(g, p) {
2209 if (KDB_FLAG(CMD_INTERRUPT))
2210 return 0;
2211 if (kdb_task_state(p, mask))
2212 kdb_ps1(p);
2213 } kdb_while_each_thread(g, p);
2214
2215 return 0;
2216}
2217
2218/*
2219 * kdb_pid - This function implements the 'pid' command which switches
2220 * the currently active process.
2221 * pid [<pid> | R]
2222 */
2223static int kdb_pid(int argc, const char **argv)
2224{
2225 struct task_struct *p;
2226 unsigned long val;
2227 int diag;
2228
2229 if (argc > 1)
2230 return KDB_ARGCOUNT;
2231
2232 if (argc) {
2233 if (strcmp(argv[1], "R") == 0) {
2234 p = KDB_TSK(kdb_initial_cpu);
2235 } else {
2236 diag = kdbgetularg(argv[1], &val);
2237 if (diag)
2238 return KDB_BADINT;
2239
2240 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2241 if (!p) {
2242 kdb_printf("No task with pid=%d\n", (pid_t)val);
2243 return 0;
2244 }
2245 }
2246 kdb_set_current_task(p);
2247 }
2248 kdb_printf("KDB current process is %s(pid=%d)\n",
2249 kdb_current_task->comm,
2250 kdb_current_task->pid);
2251
2252 return 0;
2253}
2254
2255/*
2256 * kdb_ll - This function implements the 'll' command which follows a
2257 * linked list and executes an arbitrary command for each
2258 * element.
2259 */
2260static int kdb_ll(int argc, const char **argv)
2261{
2262 int diag;
2263 unsigned long addr;
2264 long offset = 0;
2265 unsigned long va;
2266 unsigned long linkoffset;
2267 int nextarg;
2268 const char *command;
2269
2270 if (argc != 3)
2271 return KDB_ARGCOUNT;
2272
2273 nextarg = 1;
2274 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2275 if (diag)
2276 return diag;
2277
2278 diag = kdbgetularg(argv[2], &linkoffset);
2279 if (diag)
2280 return diag;
2281
2282 /*
2283 * Using the starting address as
2284 * the first element in the list, and assuming that
2285 * the list ends with a null pointer.
2286 */
2287
2288 va = addr;
2289 command = kdb_strdup(argv[3], GFP_KDB);
2290 if (!command) {
2291 kdb_printf("%s: cannot duplicate command\n", __func__);
2292 return 0;
2293 }
2294 /* Recursive use of kdb_parse, do not use argv after this point */
2295 argv = NULL;
2296
2297 while (va) {
2298 char buf[80];
2299
2300 sprintf(buf, "%s " kdb_machreg_fmt "\n", command, va);
2301 diag = kdb_parse(buf);
2302 if (diag)
2303 return diag;
2304
2305 addr = va + linkoffset;
2306 if (kdb_getword(&va, addr, sizeof(va)))
2307 return 0;
2308 }
2309 kfree(command);
2310
2311 return 0;
2312}
2313
2314static int kdb_kgdb(int argc, const char **argv)
2315{
2316 return KDB_CMD_KGDB;
2317}
2318
2319/*
2320 * kdb_help - This function implements the 'help' and '?' commands.
2321 */
2322static int kdb_help(int argc, const char **argv)
2323{
2324 kdbtab_t *kt;
2325 int i;
2326
2327 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2328 kdb_printf("-----------------------------"
2329 "-----------------------------\n");
2330 for_each_kdbcmd(kt, i) {
2331 if (kt->cmd_name)
2332 kdb_printf("%-15.15s %-20.20s %s\n", kt->cmd_name,
2333 kt->cmd_usage, kt->cmd_help);
2334 if (KDB_FLAG(CMD_INTERRUPT))
2335 return 0;
2336 }
2337 return 0;
2338}
2339
2340/*
2341 * kdb_kill - This function implements the 'kill' commands.
2342 */
2343static int kdb_kill(int argc, const char **argv)
2344{
2345 long sig, pid;
2346 char *endp;
2347 struct task_struct *p;
2348 struct siginfo info;
2349
2350 if (argc != 2)
2351 return KDB_ARGCOUNT;
2352
2353 sig = simple_strtol(argv[1], &endp, 0);
2354 if (*endp)
2355 return KDB_BADINT;
2356 if (sig >= 0) {
2357 kdb_printf("Invalid signal parameter.<-signal>\n");
2358 return 0;
2359 }
2360 sig = -sig;
2361
2362 pid = simple_strtol(argv[2], &endp, 0);
2363 if (*endp)
2364 return KDB_BADINT;
2365 if (pid <= 0) {
2366 kdb_printf("Process ID must be large than 0.\n");
2367 return 0;
2368 }
2369
2370 /* Find the process. */
2371 p = find_task_by_pid_ns(pid, &init_pid_ns);
2372 if (!p) {
2373 kdb_printf("The specified process isn't found.\n");
2374 return 0;
2375 }
2376 p = p->group_leader;
2377 info.si_signo = sig;
2378 info.si_errno = 0;
2379 info.si_code = SI_USER;
2380 info.si_pid = pid; /* same capabilities as process being signalled */
2381 info.si_uid = 0; /* kdb has root authority */
2382 kdb_send_sig_info(p, &info);
2383 return 0;
2384}
2385
2386struct kdb_tm {
2387 int tm_sec; /* seconds */
2388 int tm_min; /* minutes */
2389 int tm_hour; /* hours */
2390 int tm_mday; /* day of the month */
2391 int tm_mon; /* month */
2392 int tm_year; /* year */
2393};
2394
2395static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
2396{
2397 /* This will work from 1970-2099, 2100 is not a leap year */
2398 static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31,
2399 31, 30, 31, 30, 31 };
2400 memset(tm, 0, sizeof(*tm));
2401 tm->tm_sec = tv->tv_sec % (24 * 60 * 60);
2402 tm->tm_mday = tv->tv_sec / (24 * 60 * 60) +
2403 (2 * 365 + 1); /* shift base from 1970 to 1968 */
2404 tm->tm_min = tm->tm_sec / 60 % 60;
2405 tm->tm_hour = tm->tm_sec / 60 / 60;
2406 tm->tm_sec = tm->tm_sec % 60;
2407 tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1));
2408 tm->tm_mday %= (4*365+1);
2409 mon_day[1] = 29;
2410 while (tm->tm_mday >= mon_day[tm->tm_mon]) {
2411 tm->tm_mday -= mon_day[tm->tm_mon];
2412 if (++tm->tm_mon == 12) {
2413 tm->tm_mon = 0;
2414 ++tm->tm_year;
2415 mon_day[1] = 28;
2416 }
2417 }
2418 ++tm->tm_mday;
2419}
2420
2421/*
2422 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2423 * I cannot call that code directly from kdb, it has an unconditional
2424 * cli()/sti() and calls routines that take locks which can stop the debugger.
2425 */
2426static void kdb_sysinfo(struct sysinfo *val)
2427{
2428 struct timespec uptime;
2429 do_posix_clock_monotonic_gettime(&uptime);
2430 memset(val, 0, sizeof(*val));
2431 val->uptime = uptime.tv_sec;
2432 val->loads[0] = avenrun[0];
2433 val->loads[1] = avenrun[1];
2434 val->loads[2] = avenrun[2];
2435 val->procs = nr_threads-1;
2436 si_meminfo(val);
2437
2438 return;
2439}
2440
2441/*
2442 * kdb_summary - This function implements the 'summary' command.
2443 */
2444static int kdb_summary(int argc, const char **argv)
2445{
2446 struct kdb_tm tm;
2447 struct sysinfo val;
2448
2449 if (argc)
2450 return KDB_ARGCOUNT;
2451
2452 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2453 kdb_printf("release %s\n", init_uts_ns.name.release);
2454 kdb_printf("version %s\n", init_uts_ns.name.version);
2455 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2456 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2457 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2458 kdb_printf("ccversion %s\n", __stringify(CCVERSION));
2459
2460 kdb_gmtime(&xtime, &tm);
2461 kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
2462 "tz_minuteswest %d\n",
2463 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2464 tm.tm_hour, tm.tm_min, tm.tm_sec,
2465 sys_tz.tz_minuteswest);
2466
2467 kdb_sysinfo(&val);
2468 kdb_printf("uptime ");
2469 if (val.uptime > (24*60*60)) {
2470 int days = val.uptime / (24*60*60);
2471 val.uptime %= (24*60*60);
2472 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2473 }
2474 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2475
2476 /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
2477
2478#define LOAD_INT(x) ((x) >> FSHIFT)
2479#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
2480 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2481 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2482 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2483 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2484#undef LOAD_INT
2485#undef LOAD_FRAC
2486 /* Display in kilobytes */
2487#define K(x) ((x) << (PAGE_SHIFT - 10))
2488 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2489 "Buffers: %8lu kB\n",
2490 val.totalram, val.freeram, val.bufferram);
2491 return 0;
2492}
2493
2494/*
2495 * kdb_per_cpu - This function implements the 'per_cpu' command.
2496 */
2497static int kdb_per_cpu(int argc, const char **argv)
2498{
2499 char buf[256], fmtstr[64];
2500 kdb_symtab_t symtab;
2501 cpumask_t suppress = CPU_MASK_NONE;
2502 int cpu, diag;
2503 unsigned long addr, val, bytesperword = 0, whichcpu = ~0UL;
2504
2505 if (argc < 1 || argc > 3)
2506 return KDB_ARGCOUNT;
2507
2508 snprintf(buf, sizeof(buf), "per_cpu__%s", argv[1]);
2509 if (!kdbgetsymval(buf, &symtab)) {
2510 kdb_printf("%s is not a per_cpu variable\n", argv[1]);
2511 return KDB_BADADDR;
2512 }
2513 if (argc >= 2) {
2514 diag = kdbgetularg(argv[2], &bytesperword);
2515 if (diag)
2516 return diag;
2517 }
2518 if (!bytesperword)
2519 bytesperword = KDB_WORD_SIZE;
2520 else if (bytesperword > KDB_WORD_SIZE)
2521 return KDB_BADWIDTH;
2522 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2523 if (argc >= 3) {
2524 diag = kdbgetularg(argv[3], &whichcpu);
2525 if (diag)
2526 return diag;
2527 if (!cpu_online(whichcpu)) {
2528 kdb_printf("cpu %ld is not online\n", whichcpu);
2529 return KDB_BADCPUNUM;
2530 }
2531 }
2532
2533 /* Most architectures use __per_cpu_offset[cpu], some use
2534 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2535 */
2536#ifdef __per_cpu_offset
2537#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2538#else
2539#ifdef CONFIG_SMP
2540#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2541#else
2542#define KDB_PCU(cpu) 0
2543#endif
2544#endif
2545
2546 for_each_online_cpu(cpu) {
2547 if (whichcpu != ~0UL && whichcpu != cpu)
2548 continue;
2549 addr = symtab.sym_start + KDB_PCU(cpu);
2550 diag = kdb_getword(&val, addr, bytesperword);
2551 if (diag) {
2552 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2553 "read, diag=%d\n", cpu, addr, diag);
2554 continue;
2555 }
2556#ifdef CONFIG_SMP
2557 if (!val) {
2558 cpu_set(cpu, suppress);
2559 continue;
2560 }
2561#endif /* CONFIG_SMP */
2562 kdb_printf("%5d ", cpu);
2563 kdb_md_line(fmtstr, addr,
2564 bytesperword == KDB_WORD_SIZE,
2565 1, bytesperword, 1, 1, 0);
2566 }
2567 if (cpus_weight(suppress) == 0)
2568 return 0;
2569 kdb_printf("Zero suppressed cpu(s):");
2570 for (cpu = first_cpu(suppress); cpu < num_possible_cpus();
2571 cpu = next_cpu(cpu, suppress)) {
2572 kdb_printf(" %d", cpu);
2573 if (cpu == num_possible_cpus() - 1 ||
2574 next_cpu(cpu, suppress) != cpu + 1)
2575 continue;
2576 while (cpu < num_possible_cpus() &&
2577 next_cpu(cpu, suppress) == cpu + 1)
2578 ++cpu;
2579 kdb_printf("-%d", cpu);
2580 }
2581 kdb_printf("\n");
2582
2583#undef KDB_PCU
2584
2585 return 0;
2586}
2587
2588/*
2589 * display help for the use of cmd | grep pattern
2590 */
2591static int kdb_grep_help(int argc, const char **argv)
2592{
2593 kdb_printf("Usage of cmd args | grep pattern:\n");
2594 kdb_printf(" Any command's output may be filtered through an ");
2595 kdb_printf("emulated 'pipe'.\n");
2596 kdb_printf(" 'grep' is just a key word.\n");
2597 kdb_printf(" The pattern may include a very limited set of "
2598 "metacharacters:\n");
2599 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2600 kdb_printf(" And if there are spaces in the pattern, you may "
2601 "quote it:\n");
2602 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2603 " or \"^pat tern$\"\n");
2604 return 0;
2605}
2606
2607/*
2608 * kdb_register_repeat - This function is used to register a kernel
2609 * debugger command.
2610 * Inputs:
2611 * cmd Command name
2612 * func Function to execute the command
2613 * usage A simple usage string showing arguments
2614 * help A simple help string describing command
2615 * repeat Does the command auto repeat on enter?
2616 * Returns:
2617 * zero for success, one if a duplicate command.
2618 */
2619#define kdb_command_extend 50 /* arbitrary */
2620int kdb_register_repeat(char *cmd,
2621 kdb_func_t func,
2622 char *usage,
2623 char *help,
2624 short minlen,
2625 kdb_repeat_t repeat)
2626{
2627 int i;
2628 kdbtab_t *kp;
2629
2630 /*
2631 * Brute force method to determine duplicates
2632 */
2633 for_each_kdbcmd(kp, i) {
2634 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2635 kdb_printf("Duplicate kdb command registered: "
2636 "%s, func %p help %s\n", cmd, func, help);
2637 return 1;
2638 }
2639 }
2640
2641 /*
2642 * Insert command into first available location in table
2643 */
2644 for_each_kdbcmd(kp, i) {
2645 if (kp->cmd_name == NULL)
2646 break;
2647 }
2648
2649 if (i >= kdb_max_commands) {
2650 kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX +
2651 kdb_command_extend) * sizeof(*new), GFP_KDB);
2652 if (!new) {
2653 kdb_printf("Could not allocate new kdb_command "
2654 "table\n");
2655 return 1;
2656 }
2657 if (kdb_commands) {
2658 memcpy(new, kdb_commands,
2659 kdb_max_commands * sizeof(*new));
2660 kfree(kdb_commands);
2661 }
2662 memset(new + kdb_max_commands, 0,
2663 kdb_command_extend * sizeof(*new));
2664 kdb_commands = new;
2665 kp = kdb_commands + kdb_max_commands;
2666 kdb_max_commands += kdb_command_extend;
2667 }
2668
2669 kp->cmd_name = cmd;
2670 kp->cmd_func = func;
2671 kp->cmd_usage = usage;
2672 kp->cmd_help = help;
2673 kp->cmd_flags = 0;
2674 kp->cmd_minlen = minlen;
2675 kp->cmd_repeat = repeat;
2676
2677 return 0;
2678}
2679
2680/*
2681 * kdb_register - Compatibility register function for commands that do
2682 * not need to specify a repeat state. Equivalent to
2683 * kdb_register_repeat with KDB_REPEAT_NONE.
2684 * Inputs:
2685 * cmd Command name
2686 * func Function to execute the command
2687 * usage A simple usage string showing arguments
2688 * help A simple help string describing command
2689 * Returns:
2690 * zero for success, one if a duplicate command.
2691 */
2692int kdb_register(char *cmd,
2693 kdb_func_t func,
2694 char *usage,
2695 char *help,
2696 short minlen)
2697{
2698 return kdb_register_repeat(cmd, func, usage, help, minlen,
2699 KDB_REPEAT_NONE);
2700}
2701
2702/*
2703 * kdb_unregister - This function is used to unregister a kernel
2704 * debugger command. It is generally called when a module which
2705 * implements kdb commands is unloaded.
2706 * Inputs:
2707 * cmd Command name
2708 * Returns:
2709 * zero for success, one command not registered.
2710 */
2711int kdb_unregister(char *cmd)
2712{
2713 int i;
2714 kdbtab_t *kp;
2715
2716 /*
2717 * find the command.
2718 */
2719 for (i = 0, kp = kdb_commands; i < kdb_max_commands; i++, kp++) {
2720 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2721 kp->cmd_name = NULL;
2722 return 0;
2723 }
2724 }
2725
2726 /* Couldn't find it. */
2727 return 1;
2728}
2729
2730/* Initialize the kdb command table. */
2731static void __init kdb_inittab(void)
2732{
2733 int i;
2734 kdbtab_t *kp;
2735
2736 for_each_kdbcmd(kp, i)
2737 kp->cmd_name = NULL;
2738
2739 kdb_register_repeat("md", kdb_md, "<vaddr>",
2740 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2741 KDB_REPEAT_NO_ARGS);
2742 kdb_register_repeat("mdr", kdb_md, "<vaddr> <bytes>",
2743 "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS);
2744 kdb_register_repeat("mdp", kdb_md, "<paddr> <bytes>",
2745 "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS);
2746 kdb_register_repeat("mds", kdb_md, "<vaddr>",
2747 "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS);
2748 kdb_register_repeat("mm", kdb_mm, "<vaddr> <contents>",
2749 "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS);
2750 kdb_register_repeat("go", kdb_go, "[<vaddr>]",
2751 "Continue Execution", 1, KDB_REPEAT_NONE);
2752 kdb_register_repeat("rd", kdb_rd, "",
2753 "Display Registers", 0, KDB_REPEAT_NONE);
2754 kdb_register_repeat("rm", kdb_rm, "<reg> <contents>",
2755 "Modify Registers", 0, KDB_REPEAT_NONE);
2756 kdb_register_repeat("ef", kdb_ef, "<vaddr>",
2757 "Display exception frame", 0, KDB_REPEAT_NONE);
2758 kdb_register_repeat("bt", kdb_bt, "[<vaddr>]",
2759 "Stack traceback", 1, KDB_REPEAT_NONE);
2760 kdb_register_repeat("btp", kdb_bt, "<pid>",
2761 "Display stack for process <pid>", 0, KDB_REPEAT_NONE);
2762 kdb_register_repeat("bta", kdb_bt, "[DRSTCZEUIMA]",
2763 "Display stack all processes", 0, KDB_REPEAT_NONE);
2764 kdb_register_repeat("btc", kdb_bt, "",
2765 "Backtrace current process on each cpu", 0, KDB_REPEAT_NONE);
2766 kdb_register_repeat("btt", kdb_bt, "<vaddr>",
2767 "Backtrace process given its struct task address", 0,
2768 KDB_REPEAT_NONE);
2769 kdb_register_repeat("ll", kdb_ll, "<first-element> <linkoffset> <cmd>",
2770 "Execute cmd for each element in linked list", 0, KDB_REPEAT_NONE);
2771 kdb_register_repeat("env", kdb_env, "",
2772 "Show environment variables", 0, KDB_REPEAT_NONE);
2773 kdb_register_repeat("set", kdb_set, "",
2774 "Set environment variables", 0, KDB_REPEAT_NONE);
2775 kdb_register_repeat("help", kdb_help, "",
2776 "Display Help Message", 1, KDB_REPEAT_NONE);
2777 kdb_register_repeat("?", kdb_help, "",
2778 "Display Help Message", 0, KDB_REPEAT_NONE);
2779 kdb_register_repeat("cpu", kdb_cpu, "<cpunum>",
2780 "Switch to new cpu", 0, KDB_REPEAT_NONE);
2781 kdb_register_repeat("kgdb", kdb_kgdb, "",
2782 "Enter kgdb mode", 0, KDB_REPEAT_NONE);
2783 kdb_register_repeat("ps", kdb_ps, "[<flags>|A]",
2784 "Display active task list", 0, KDB_REPEAT_NONE);
2785 kdb_register_repeat("pid", kdb_pid, "<pidnum>",
2786 "Switch to another task", 0, KDB_REPEAT_NONE);
2787 kdb_register_repeat("reboot", kdb_reboot, "",
2788 "Reboot the machine immediately", 0, KDB_REPEAT_NONE);
2789#if defined(CONFIG_MODULES)
2790 kdb_register_repeat("lsmod", kdb_lsmod, "",
2791 "List loaded kernel modules", 0, KDB_REPEAT_NONE);
2792#endif
2793#if defined(CONFIG_MAGIC_SYSRQ)
2794 kdb_register_repeat("sr", kdb_sr, "<key>",
2795 "Magic SysRq key", 0, KDB_REPEAT_NONE);
2796#endif
2797#if defined(CONFIG_PRINTK)
2798 kdb_register_repeat("dmesg", kdb_dmesg, "[lines]",
2799 "Display syslog buffer", 0, KDB_REPEAT_NONE);
2800#endif
2801 kdb_register_repeat("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2802 "Define a set of commands, down to endefcmd", 0, KDB_REPEAT_NONE);
2803 kdb_register_repeat("kill", kdb_kill, "<-signal> <pid>",
2804 "Send a signal to a process", 0, KDB_REPEAT_NONE);
2805 kdb_register_repeat("summary", kdb_summary, "",
2806 "Summarize the system", 4, KDB_REPEAT_NONE);
2807 kdb_register_repeat("per_cpu", kdb_per_cpu, "",
2808 "Display per_cpu variables", 3, KDB_REPEAT_NONE);
2809 kdb_register_repeat("grephelp", kdb_grep_help, "",
2810 "Display help on | grep", 0, KDB_REPEAT_NONE);
2811}
2812
2813/* Execute any commands defined in kdb_cmds. */
2814static void __init kdb_cmd_init(void)
2815{
2816 int i, diag;
2817 for (i = 0; kdb_cmds[i]; ++i) {
2818 diag = kdb_parse(kdb_cmds[i]);
2819 if (diag)
2820 kdb_printf("kdb command %s failed, kdb diag %d\n",
2821 kdb_cmds[i], diag);
2822 }
2823 if (defcmd_in_progress) {
2824 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2825 kdb_parse("endefcmd");
2826 }
2827}
2828
2829/* Intialize kdb_printf, breakpoint tables and kdb state */
2830void __init kdb_init(int lvl)
2831{
2832 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2833 int i;
2834
2835 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2836 return;
2837 for (i = kdb_init_lvl; i < lvl; i++) {
2838 switch (i) {
2839 case KDB_NOT_INITIALIZED:
2840 kdb_inittab(); /* Initialize Command Table */
2841 kdb_initbptab(); /* Initialize Breakpoints */
2842 break;
2843 case KDB_INIT_EARLY:
2844 kdb_cmd_init(); /* Build kdb_cmds tables */
2845 break;
2846 }
2847 }
2848 kdb_init_lvl = lvl;
2849}
diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h
new file mode 100644
index 000000000000..97d3ba69775d
--- /dev/null
+++ b/kernel/debug/kdb/kdb_private.h
@@ -0,0 +1,300 @@
1#ifndef _KDBPRIVATE_H
2#define _KDBPRIVATE_H
3
4/*
5 * Kernel Debugger Architecture Independent Private Headers
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
9 * for more details.
10 *
11 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
12 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
13 */
14
15#include <linux/kgdb.h>
16#include "../debug_core.h"
17
18/* Kernel Debugger Error codes. Must not overlap with command codes. */
19#define KDB_NOTFOUND (-1)
20#define KDB_ARGCOUNT (-2)
21#define KDB_BADWIDTH (-3)
22#define KDB_BADRADIX (-4)
23#define KDB_NOTENV (-5)
24#define KDB_NOENVVALUE (-6)
25#define KDB_NOTIMP (-7)
26#define KDB_ENVFULL (-8)
27#define KDB_ENVBUFFULL (-9)
28#define KDB_TOOMANYBPT (-10)
29#define KDB_TOOMANYDBREGS (-11)
30#define KDB_DUPBPT (-12)
31#define KDB_BPTNOTFOUND (-13)
32#define KDB_BADMODE (-14)
33#define KDB_BADINT (-15)
34#define KDB_INVADDRFMT (-16)
35#define KDB_BADREG (-17)
36#define KDB_BADCPUNUM (-18)
37#define KDB_BADLENGTH (-19)
38#define KDB_NOBP (-20)
39#define KDB_BADADDR (-21)
40
41/* Kernel Debugger Command codes. Must not overlap with error codes. */
42#define KDB_CMD_GO (-1001)
43#define KDB_CMD_CPU (-1002)
44#define KDB_CMD_SS (-1003)
45#define KDB_CMD_SSB (-1004)
46#define KDB_CMD_KGDB (-1005)
47#define KDB_CMD_KGDB2 (-1006)
48
49/* Internal debug flags */
50#define KDB_DEBUG_FLAG_BP 0x0002 /* Breakpoint subsystem debug */
51#define KDB_DEBUG_FLAG_BB_SUMM 0x0004 /* Basic block analysis, summary only */
52#define KDB_DEBUG_FLAG_AR 0x0008 /* Activation record, generic */
53#define KDB_DEBUG_FLAG_ARA 0x0010 /* Activation record, arch specific */
54#define KDB_DEBUG_FLAG_BB 0x0020 /* All basic block analysis */
55#define KDB_DEBUG_FLAG_STATE 0x0040 /* State flags */
56#define KDB_DEBUG_FLAG_MASK 0xffff /* All debug flags */
57#define KDB_DEBUG_FLAG_SHIFT 16 /* Shift factor for dbflags */
58
59#define KDB_DEBUG(flag) (kdb_flags & \
60 (KDB_DEBUG_FLAG_##flag << KDB_DEBUG_FLAG_SHIFT))
61#define KDB_DEBUG_STATE(text, value) if (KDB_DEBUG(STATE)) \
62 kdb_print_state(text, value)
63
64#if BITS_PER_LONG == 32
65
66#define KDB_PLATFORM_ENV "BYTESPERWORD=4"
67
68#define kdb_machreg_fmt "0x%lx"
69#define kdb_machreg_fmt0 "0x%08lx"
70#define kdb_bfd_vma_fmt "0x%lx"
71#define kdb_bfd_vma_fmt0 "0x%08lx"
72#define kdb_elfw_addr_fmt "0x%x"
73#define kdb_elfw_addr_fmt0 "0x%08x"
74#define kdb_f_count_fmt "%d"
75
76#elif BITS_PER_LONG == 64
77
78#define KDB_PLATFORM_ENV "BYTESPERWORD=8"
79
80#define kdb_machreg_fmt "0x%lx"
81#define kdb_machreg_fmt0 "0x%016lx"
82#define kdb_bfd_vma_fmt "0x%lx"
83#define kdb_bfd_vma_fmt0 "0x%016lx"
84#define kdb_elfw_addr_fmt "0x%x"
85#define kdb_elfw_addr_fmt0 "0x%016x"
86#define kdb_f_count_fmt "%ld"
87
88#endif
89
90/*
91 * KDB_MAXBPT describes the total number of breakpoints
92 * supported by this architecure.
93 */
94#define KDB_MAXBPT 16
95
96/* Maximum number of arguments to a function */
97#define KDB_MAXARGS 16
98
99typedef enum {
100 KDB_REPEAT_NONE = 0, /* Do not repeat this command */
101 KDB_REPEAT_NO_ARGS, /* Repeat the command without arguments */
102 KDB_REPEAT_WITH_ARGS, /* Repeat the command including its arguments */
103} kdb_repeat_t;
104
105typedef int (*kdb_func_t)(int, const char **);
106
107/* Symbol table format returned by kallsyms. */
108typedef struct __ksymtab {
109 unsigned long value; /* Address of symbol */
110 const char *mod_name; /* Module containing symbol or
111 * "kernel" */
112 unsigned long mod_start;
113 unsigned long mod_end;
114 const char *sec_name; /* Section containing symbol */
115 unsigned long sec_start;
116 unsigned long sec_end;
117 const char *sym_name; /* Full symbol name, including
118 * any version */
119 unsigned long sym_start;
120 unsigned long sym_end;
121 } kdb_symtab_t;
122extern int kallsyms_symbol_next(char *prefix_name, int flag);
123extern int kallsyms_symbol_complete(char *prefix_name, int max_len);
124
125/* Exported Symbols for kernel loadable modules to use. */
126extern int kdb_register(char *, kdb_func_t, char *, char *, short);
127extern int kdb_register_repeat(char *, kdb_func_t, char *, char *,
128 short, kdb_repeat_t);
129extern int kdb_unregister(char *);
130
131extern int kdb_getarea_size(void *, unsigned long, size_t);
132extern int kdb_putarea_size(unsigned long, void *, size_t);
133
134/*
135 * Like get_user and put_user, kdb_getarea and kdb_putarea take variable
136 * names, not pointers. The underlying *_size functions take pointers.
137 */
138#define kdb_getarea(x, addr) kdb_getarea_size(&(x), addr, sizeof((x)))
139#define kdb_putarea(addr, x) kdb_putarea_size(addr, &(x), sizeof((x)))
140
141extern int kdb_getphysword(unsigned long *word,
142 unsigned long addr, size_t size);
143extern int kdb_getword(unsigned long *, unsigned long, size_t);
144extern int kdb_putword(unsigned long, unsigned long, size_t);
145
146extern int kdbgetularg(const char *, unsigned long *);
147extern int kdb_set(int, const char **);
148extern char *kdbgetenv(const char *);
149extern int kdbgetintenv(const char *, int *);
150extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
151 long *, char **);
152extern int kdbgetsymval(const char *, kdb_symtab_t *);
153extern int kdbnearsym(unsigned long, kdb_symtab_t *);
154extern void kdbnearsym_cleanup(void);
155extern char *kdb_strdup(const char *str, gfp_t type);
156extern void kdb_symbol_print(unsigned long, const kdb_symtab_t *, unsigned int);
157
158/* Routine for debugging the debugger state. */
159extern void kdb_print_state(const char *, int);
160
161extern int kdb_state;
162#define KDB_STATE_KDB 0x00000001 /* Cpu is inside kdb */
163#define KDB_STATE_LEAVING 0x00000002 /* Cpu is leaving kdb */
164#define KDB_STATE_CMD 0x00000004 /* Running a kdb command */
165#define KDB_STATE_KDB_CONTROL 0x00000008 /* This cpu is under
166 * kdb control */
167#define KDB_STATE_HOLD_CPU 0x00000010 /* Hold this cpu inside kdb */
168#define KDB_STATE_DOING_SS 0x00000020 /* Doing ss command */
169#define KDB_STATE_DOING_SSB 0x00000040 /* Doing ssb command,
170 * DOING_SS is also set */
171#define KDB_STATE_SSBPT 0x00000080 /* Install breakpoint
172 * after one ss, independent of
173 * DOING_SS */
174#define KDB_STATE_REENTRY 0x00000100 /* Valid re-entry into kdb */
175#define KDB_STATE_SUPPRESS 0x00000200 /* Suppress error messages */
176#define KDB_STATE_PAGER 0x00000400 /* pager is available */
177#define KDB_STATE_GO_SWITCH 0x00000800 /* go is switching
178 * back to initial cpu */
179#define KDB_STATE_PRINTF_LOCK 0x00001000 /* Holds kdb_printf lock */
180#define KDB_STATE_WAIT_IPI 0x00002000 /* Waiting for kdb_ipi() NMI */
181#define KDB_STATE_RECURSE 0x00004000 /* Recursive entry to kdb */
182#define KDB_STATE_IP_ADJUSTED 0x00008000 /* Restart IP has been
183 * adjusted */
184#define KDB_STATE_GO1 0x00010000 /* go only releases one cpu */
185#define KDB_STATE_KEYBOARD 0x00020000 /* kdb entered via
186 * keyboard on this cpu */
187#define KDB_STATE_KEXEC 0x00040000 /* kexec issued */
188#define KDB_STATE_DOING_KGDB 0x00080000 /* kgdb enter now issued */
189#define KDB_STATE_DOING_KGDB2 0x00100000 /* kgdb enter now issued */
190#define KDB_STATE_KGDB_TRANS 0x00200000 /* Transition to kgdb */
191#define KDB_STATE_ARCH 0xff000000 /* Reserved for arch
192 * specific use */
193
194#define KDB_STATE(flag) (kdb_state & KDB_STATE_##flag)
195#define KDB_STATE_SET(flag) ((void)(kdb_state |= KDB_STATE_##flag))
196#define KDB_STATE_CLEAR(flag) ((void)(kdb_state &= ~KDB_STATE_##flag))
197
198extern int kdb_nextline; /* Current number of lines displayed */
199
200typedef struct _kdb_bp {
201 unsigned long bp_addr; /* Address breakpoint is present at */
202 unsigned int bp_free:1; /* This entry is available */
203 unsigned int bp_enabled:1; /* Breakpoint is active in register */
204 unsigned int bp_type:4; /* Uses hardware register */
205 unsigned int bp_installed:1; /* Breakpoint is installed */
206 unsigned int bp_delay:1; /* Do delayed bp handling */
207 unsigned int bp_delayed:1; /* Delayed breakpoint */
208 unsigned int bph_length; /* HW break length */
209} kdb_bp_t;
210
211#ifdef CONFIG_KGDB_KDB
212extern kdb_bp_t kdb_breakpoints[/* KDB_MAXBPT */];
213
214/* The KDB shell command table */
215typedef struct _kdbtab {
216 char *cmd_name; /* Command name */
217 kdb_func_t cmd_func; /* Function to execute command */
218 char *cmd_usage; /* Usage String for this command */
219 char *cmd_help; /* Help message for this command */
220 short cmd_flags; /* Parsing flags */
221 short cmd_minlen; /* Minimum legal # command
222 * chars required */
223 kdb_repeat_t cmd_repeat; /* Does command auto repeat on enter? */
224} kdbtab_t;
225
226extern int kdb_bt(int, const char **); /* KDB display back trace */
227
228/* KDB breakpoint management functions */
229extern void kdb_initbptab(void);
230extern void kdb_bp_install(struct pt_regs *);
231extern void kdb_bp_remove(void);
232
233typedef enum {
234 KDB_DB_BPT, /* Breakpoint */
235 KDB_DB_SS, /* Single-step trap */
236 KDB_DB_SSB, /* Single step to branch */
237 KDB_DB_SSBPT, /* Single step over breakpoint */
238 KDB_DB_NOBPT /* Spurious breakpoint */
239} kdb_dbtrap_t;
240
241extern int kdb_main_loop(kdb_reason_t, kdb_reason_t,
242 int, kdb_dbtrap_t, struct pt_regs *);
243
244/* Miscellaneous functions and data areas */
245extern int kdb_grepping_flag;
246extern char kdb_grep_string[];
247extern int kdb_grep_leading;
248extern int kdb_grep_trailing;
249extern char *kdb_cmds[];
250extern void kdb_syslog_data(char *syslog_data[]);
251extern unsigned long kdb_task_state_string(const char *);
252extern char kdb_task_state_char (const struct task_struct *);
253extern unsigned long kdb_task_state(const struct task_struct *p,
254 unsigned long mask);
255extern void kdb_ps_suppressed(void);
256extern void kdb_ps1(const struct task_struct *p);
257extern void kdb_print_nameval(const char *name, unsigned long val);
258extern void kdb_send_sig_info(struct task_struct *p, struct siginfo *info);
259extern void kdb_meminfo_proc_show(void);
260extern const char *kdb_walk_kallsyms(loff_t *pos);
261extern char *kdb_getstr(char *, size_t, char *);
262
263/* Defines for kdb_symbol_print */
264#define KDB_SP_SPACEB 0x0001 /* Space before string */
265#define KDB_SP_SPACEA 0x0002 /* Space after string */
266#define KDB_SP_PAREN 0x0004 /* Parenthesis around string */
267#define KDB_SP_VALUE 0x0008 /* Print the value of the address */
268#define KDB_SP_SYMSIZE 0x0010 /* Print the size of the symbol */
269#define KDB_SP_NEWLINE 0x0020 /* Newline after string */
270#define KDB_SP_DEFAULT (KDB_SP_VALUE|KDB_SP_PAREN)
271
272#define KDB_TSK(cpu) kgdb_info[cpu].task
273#define KDB_TSKREGS(cpu) kgdb_info[cpu].debuggerinfo
274
275extern struct task_struct *kdb_curr_task(int);
276
277#define kdb_task_has_cpu(p) (task_curr(p))
278
279/* Simplify coexistence with NPTL */
280#define kdb_do_each_thread(g, p) do_each_thread(g, p)
281#define kdb_while_each_thread(g, p) while_each_thread(g, p)
282
283#define GFP_KDB (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
284
285extern void *debug_kmalloc(size_t size, gfp_t flags);
286extern void debug_kfree(void *);
287extern void debug_kusage(void);
288
289extern void kdb_set_current_task(struct task_struct *);
290extern struct task_struct *kdb_current_task;
291#ifdef CONFIG_MODULES
292extern struct list_head *kdb_modules;
293#endif /* CONFIG_MODULES */
294
295extern char kdb_prompt_str[];
296
297#define KDB_WORD_SIZE ((int)sizeof(unsigned long))
298
299#endif /* CONFIG_KGDB_KDB */
300#endif /* !_KDBPRIVATE_H */
diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
new file mode 100644
index 000000000000..45344d5c53dd
--- /dev/null
+++ b/kernel/debug/kdb/kdb_support.c
@@ -0,0 +1,927 @@
1/*
2 * Kernel Debugger Architecture Independent Support Functions
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (c) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
10 * 03/02/13 added new 2.5 kallsyms <xavier.bru@bull.net>
11 */
12
13#include <stdarg.h>
14#include <linux/types.h>
15#include <linux/sched.h>
16#include <linux/mm.h>
17#include <linux/kallsyms.h>
18#include <linux/stddef.h>
19#include <linux/vmalloc.h>
20#include <linux/ptrace.h>
21#include <linux/module.h>
22#include <linux/highmem.h>
23#include <linux/hardirq.h>
24#include <linux/delay.h>
25#include <linux/uaccess.h>
26#include <linux/kdb.h>
27#include <linux/slab.h>
28#include "kdb_private.h"
29
30/*
31 * kdbgetsymval - Return the address of the given symbol.
32 *
33 * Parameters:
34 * symname Character string containing symbol name
35 * symtab Structure to receive results
36 * Returns:
37 * 0 Symbol not found, symtab zero filled
38 * 1 Symbol mapped to module/symbol/section, data in symtab
39 */
40int kdbgetsymval(const char *symname, kdb_symtab_t *symtab)
41{
42 if (KDB_DEBUG(AR))
43 kdb_printf("kdbgetsymval: symname=%s, symtab=%p\n", symname,
44 symtab);
45 memset(symtab, 0, sizeof(*symtab));
46 symtab->sym_start = kallsyms_lookup_name(symname);
47 if (symtab->sym_start) {
48 if (KDB_DEBUG(AR))
49 kdb_printf("kdbgetsymval: returns 1, "
50 "symtab->sym_start=0x%lx\n",
51 symtab->sym_start);
52 return 1;
53 }
54 if (KDB_DEBUG(AR))
55 kdb_printf("kdbgetsymval: returns 0\n");
56 return 0;
57}
58EXPORT_SYMBOL(kdbgetsymval);
59
60static char *kdb_name_table[100]; /* arbitrary size */
61
62/*
63 * kdbnearsym - Return the name of the symbol with the nearest address
64 * less than 'addr'.
65 *
66 * Parameters:
67 * addr Address to check for symbol near
68 * symtab Structure to receive results
69 * Returns:
70 * 0 No sections contain this address, symtab zero filled
71 * 1 Address mapped to module/symbol/section, data in symtab
72 * Remarks:
73 * 2.6 kallsyms has a "feature" where it unpacks the name into a
74 * string. If that string is reused before the caller expects it
75 * then the caller sees its string change without warning. To
76 * avoid cluttering up the main kdb code with lots of kdb_strdup,
77 * tests and kfree calls, kdbnearsym maintains an LRU list of the
78 * last few unique strings. The list is sized large enough to
79 * hold active strings, no kdb caller of kdbnearsym makes more
80 * than ~20 later calls before using a saved value.
81 */
82int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
83{
84 int ret = 0;
85 unsigned long symbolsize;
86 unsigned long offset;
87#define knt1_size 128 /* must be >= kallsyms table size */
88 char *knt1 = NULL;
89
90 if (KDB_DEBUG(AR))
91 kdb_printf("kdbnearsym: addr=0x%lx, symtab=%p\n", addr, symtab);
92 memset(symtab, 0, sizeof(*symtab));
93
94 if (addr < 4096)
95 goto out;
96 knt1 = debug_kmalloc(knt1_size, GFP_ATOMIC);
97 if (!knt1) {
98 kdb_printf("kdbnearsym: addr=0x%lx cannot kmalloc knt1\n",
99 addr);
100 goto out;
101 }
102 symtab->sym_name = kallsyms_lookup(addr, &symbolsize , &offset,
103 (char **)(&symtab->mod_name), knt1);
104 if (offset > 8*1024*1024) {
105 symtab->sym_name = NULL;
106 addr = offset = symbolsize = 0;
107 }
108 symtab->sym_start = addr - offset;
109 symtab->sym_end = symtab->sym_start + symbolsize;
110 ret = symtab->sym_name != NULL && *(symtab->sym_name) != '\0';
111
112 if (ret) {
113 int i;
114 /* Another 2.6 kallsyms "feature". Sometimes the sym_name is
115 * set but the buffer passed into kallsyms_lookup is not used,
116 * so it contains garbage. The caller has to work out which
117 * buffer needs to be saved.
118 *
119 * What was Rusty smoking when he wrote that code?
120 */
121 if (symtab->sym_name != knt1) {
122 strncpy(knt1, symtab->sym_name, knt1_size);
123 knt1[knt1_size-1] = '\0';
124 }
125 for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
126 if (kdb_name_table[i] &&
127 strcmp(kdb_name_table[i], knt1) == 0)
128 break;
129 }
130 if (i >= ARRAY_SIZE(kdb_name_table)) {
131 debug_kfree(kdb_name_table[0]);
132 memcpy(kdb_name_table, kdb_name_table+1,
133 sizeof(kdb_name_table[0]) *
134 (ARRAY_SIZE(kdb_name_table)-1));
135 } else {
136 debug_kfree(knt1);
137 knt1 = kdb_name_table[i];
138 memcpy(kdb_name_table+i, kdb_name_table+i+1,
139 sizeof(kdb_name_table[0]) *
140 (ARRAY_SIZE(kdb_name_table)-i-1));
141 }
142 i = ARRAY_SIZE(kdb_name_table) - 1;
143 kdb_name_table[i] = knt1;
144 symtab->sym_name = kdb_name_table[i];
145 knt1 = NULL;
146 }
147
148 if (symtab->mod_name == NULL)
149 symtab->mod_name = "kernel";
150 if (KDB_DEBUG(AR))
151 kdb_printf("kdbnearsym: returns %d symtab->sym_start=0x%lx, "
152 "symtab->mod_name=%p, symtab->sym_name=%p (%s)\n", ret,
153 symtab->sym_start, symtab->mod_name, symtab->sym_name,
154 symtab->sym_name);
155
156out:
157 debug_kfree(knt1);
158 return ret;
159}
160
161void kdbnearsym_cleanup(void)
162{
163 int i;
164 for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
165 if (kdb_name_table[i]) {
166 debug_kfree(kdb_name_table[i]);
167 kdb_name_table[i] = NULL;
168 }
169 }
170}
171
172static char ks_namebuf[KSYM_NAME_LEN+1], ks_namebuf_prev[KSYM_NAME_LEN+1];
173
174/*
175 * kallsyms_symbol_complete
176 *
177 * Parameters:
178 * prefix_name prefix of a symbol name to lookup
179 * max_len maximum length that can be returned
180 * Returns:
181 * Number of symbols which match the given prefix.
182 * Notes:
183 * prefix_name is changed to contain the longest unique prefix that
184 * starts with this prefix (tab completion).
185 */
186int kallsyms_symbol_complete(char *prefix_name, int max_len)
187{
188 loff_t pos = 0;
189 int prefix_len = strlen(prefix_name), prev_len = 0;
190 int i, number = 0;
191 const char *name;
192
193 while ((name = kdb_walk_kallsyms(&pos))) {
194 if (strncmp(name, prefix_name, prefix_len) == 0) {
195 strcpy(ks_namebuf, name);
196 /* Work out the longest name that matches the prefix */
197 if (++number == 1) {
198 prev_len = min_t(int, max_len-1,
199 strlen(ks_namebuf));
200 memcpy(ks_namebuf_prev, ks_namebuf, prev_len);
201 ks_namebuf_prev[prev_len] = '\0';
202 continue;
203 }
204 for (i = 0; i < prev_len; i++) {
205 if (ks_namebuf[i] != ks_namebuf_prev[i]) {
206 prev_len = i;
207 ks_namebuf_prev[i] = '\0';
208 break;
209 }
210 }
211 }
212 }
213 if (prev_len > prefix_len)
214 memcpy(prefix_name, ks_namebuf_prev, prev_len+1);
215 return number;
216}
217
218/*
219 * kallsyms_symbol_next
220 *
221 * Parameters:
222 * prefix_name prefix of a symbol name to lookup
223 * flag 0 means search from the head, 1 means continue search.
224 * Returns:
225 * 1 if a symbol matches the given prefix.
226 * 0 if no string found
227 */
228int kallsyms_symbol_next(char *prefix_name, int flag)
229{
230 int prefix_len = strlen(prefix_name);
231 static loff_t pos;
232 const char *name;
233
234 if (!flag)
235 pos = 0;
236
237 while ((name = kdb_walk_kallsyms(&pos))) {
238 if (strncmp(name, prefix_name, prefix_len) == 0) {
239 strncpy(prefix_name, name, strlen(name)+1);
240 return 1;
241 }
242 }
243 return 0;
244}
245
246/*
247 * kdb_symbol_print - Standard method for printing a symbol name and offset.
248 * Inputs:
249 * addr Address to be printed.
250 * symtab Address of symbol data, if NULL this routine does its
251 * own lookup.
252 * punc Punctuation for string, bit field.
253 * Remarks:
254 * The string and its punctuation is only printed if the address
255 * is inside the kernel, except that the value is always printed
256 * when requested.
257 */
258void kdb_symbol_print(unsigned long addr, const kdb_symtab_t *symtab_p,
259 unsigned int punc)
260{
261 kdb_symtab_t symtab, *symtab_p2;
262 if (symtab_p) {
263 symtab_p2 = (kdb_symtab_t *)symtab_p;
264 } else {
265 symtab_p2 = &symtab;
266 kdbnearsym(addr, symtab_p2);
267 }
268 if (!(symtab_p2->sym_name || (punc & KDB_SP_VALUE)))
269 return;
270 if (punc & KDB_SP_SPACEB)
271 kdb_printf(" ");
272 if (punc & KDB_SP_VALUE)
273 kdb_printf(kdb_machreg_fmt0, addr);
274 if (symtab_p2->sym_name) {
275 if (punc & KDB_SP_VALUE)
276 kdb_printf(" ");
277 if (punc & KDB_SP_PAREN)
278 kdb_printf("(");
279 if (strcmp(symtab_p2->mod_name, "kernel"))
280 kdb_printf("[%s]", symtab_p2->mod_name);
281 kdb_printf("%s", symtab_p2->sym_name);
282 if (addr != symtab_p2->sym_start)
283 kdb_printf("+0x%lx", addr - symtab_p2->sym_start);
284 if (punc & KDB_SP_SYMSIZE)
285 kdb_printf("/0x%lx",
286 symtab_p2->sym_end - symtab_p2->sym_start);
287 if (punc & KDB_SP_PAREN)
288 kdb_printf(")");
289 }
290 if (punc & KDB_SP_SPACEA)
291 kdb_printf(" ");
292 if (punc & KDB_SP_NEWLINE)
293 kdb_printf("\n");
294}
295
296/*
297 * kdb_strdup - kdb equivalent of strdup, for disasm code.
298 * Inputs:
299 * str The string to duplicate.
300 * type Flags to kmalloc for the new string.
301 * Returns:
302 * Address of the new string, NULL if storage could not be allocated.
303 * Remarks:
304 * This is not in lib/string.c because it uses kmalloc which is not
305 * available when string.o is used in boot loaders.
306 */
307char *kdb_strdup(const char *str, gfp_t type)
308{
309 int n = strlen(str)+1;
310 char *s = kmalloc(n, type);
311 if (!s)
312 return NULL;
313 return strcpy(s, str);
314}
315
316/*
317 * kdb_getarea_size - Read an area of data. The kdb equivalent of
318 * copy_from_user, with kdb messages for invalid addresses.
319 * Inputs:
320 * res Pointer to the area to receive the result.
321 * addr Address of the area to copy.
322 * size Size of the area.
323 * Returns:
324 * 0 for success, < 0 for error.
325 */
326int kdb_getarea_size(void *res, unsigned long addr, size_t size)
327{
328 int ret = probe_kernel_read((char *)res, (char *)addr, size);
329 if (ret) {
330 if (!KDB_STATE(SUPPRESS)) {
331 kdb_printf("kdb_getarea: Bad address 0x%lx\n", addr);
332 KDB_STATE_SET(SUPPRESS);
333 }
334 ret = KDB_BADADDR;
335 } else {
336 KDB_STATE_CLEAR(SUPPRESS);
337 }
338 return ret;
339}
340
341/*
342 * kdb_putarea_size - Write an area of data. The kdb equivalent of
343 * copy_to_user, with kdb messages for invalid addresses.
344 * Inputs:
345 * addr Address of the area to write to.
346 * res Pointer to the area holding the data.
347 * size Size of the area.
348 * Returns:
349 * 0 for success, < 0 for error.
350 */
351int kdb_putarea_size(unsigned long addr, void *res, size_t size)
352{
353 int ret = probe_kernel_read((char *)addr, (char *)res, size);
354 if (ret) {
355 if (!KDB_STATE(SUPPRESS)) {
356 kdb_printf("kdb_putarea: Bad address 0x%lx\n", addr);
357 KDB_STATE_SET(SUPPRESS);
358 }
359 ret = KDB_BADADDR;
360 } else {
361 KDB_STATE_CLEAR(SUPPRESS);
362 }
363 return ret;
364}
365
366/*
367 * kdb_getphys - Read data from a physical address. Validate the
368 * address is in range, use kmap_atomic() to get data
369 * similar to kdb_getarea() - but for phys addresses
370 * Inputs:
371 * res Pointer to the word to receive the result
372 * addr Physical address of the area to copy
373 * size Size of the area
374 * Returns:
375 * 0 for success, < 0 for error.
376 */
377static int kdb_getphys(void *res, unsigned long addr, size_t size)
378{
379 unsigned long pfn;
380 void *vaddr;
381 struct page *page;
382
383 pfn = (addr >> PAGE_SHIFT);
384 if (!pfn_valid(pfn))
385 return 1;
386 page = pfn_to_page(pfn);
387 vaddr = kmap_atomic(page, KM_KDB);
388 memcpy(res, vaddr + (addr & (PAGE_SIZE - 1)), size);
389 kunmap_atomic(vaddr, KM_KDB);
390
391 return 0;
392}
393
394/*
395 * kdb_getphysword
396 * Inputs:
397 * word Pointer to the word to receive the result.
398 * addr Address of the area to copy.
399 * size Size of the area.
400 * Returns:
401 * 0 for success, < 0 for error.
402 */
403int kdb_getphysword(unsigned long *word, unsigned long addr, size_t size)
404{
405 int diag;
406 __u8 w1;
407 __u16 w2;
408 __u32 w4;
409 __u64 w8;
410 *word = 0; /* Default value if addr or size is invalid */
411
412 switch (size) {
413 case 1:
414 diag = kdb_getphys(&w1, addr, sizeof(w1));
415 if (!diag)
416 *word = w1;
417 break;
418 case 2:
419 diag = kdb_getphys(&w2, addr, sizeof(w2));
420 if (!diag)
421 *word = w2;
422 break;
423 case 4:
424 diag = kdb_getphys(&w4, addr, sizeof(w4));
425 if (!diag)
426 *word = w4;
427 break;
428 case 8:
429 if (size <= sizeof(*word)) {
430 diag = kdb_getphys(&w8, addr, sizeof(w8));
431 if (!diag)
432 *word = w8;
433 break;
434 }
435 /* drop through */
436 default:
437 diag = KDB_BADWIDTH;
438 kdb_printf("kdb_getphysword: bad width %ld\n", (long) size);
439 }
440 return diag;
441}
442
443/*
444 * kdb_getword - Read a binary value. Unlike kdb_getarea, this treats
445 * data as numbers.
446 * Inputs:
447 * word Pointer to the word to receive the result.
448 * addr Address of the area to copy.
449 * size Size of the area.
450 * Returns:
451 * 0 for success, < 0 for error.
452 */
453int kdb_getword(unsigned long *word, unsigned long addr, size_t size)
454{
455 int diag;
456 __u8 w1;
457 __u16 w2;
458 __u32 w4;
459 __u64 w8;
460 *word = 0; /* Default value if addr or size is invalid */
461 switch (size) {
462 case 1:
463 diag = kdb_getarea(w1, addr);
464 if (!diag)
465 *word = w1;
466 break;
467 case 2:
468 diag = kdb_getarea(w2, addr);
469 if (!diag)
470 *word = w2;
471 break;
472 case 4:
473 diag = kdb_getarea(w4, addr);
474 if (!diag)
475 *word = w4;
476 break;
477 case 8:
478 if (size <= sizeof(*word)) {
479 diag = kdb_getarea(w8, addr);
480 if (!diag)
481 *word = w8;
482 break;
483 }
484 /* drop through */
485 default:
486 diag = KDB_BADWIDTH;
487 kdb_printf("kdb_getword: bad width %ld\n", (long) size);
488 }
489 return diag;
490}
491
492/*
493 * kdb_putword - Write a binary value. Unlike kdb_putarea, this
494 * treats data as numbers.
495 * Inputs:
496 * addr Address of the area to write to..
497 * word The value to set.
498 * size Size of the area.
499 * Returns:
500 * 0 for success, < 0 for error.
501 */
502int kdb_putword(unsigned long addr, unsigned long word, size_t size)
503{
504 int diag;
505 __u8 w1;
506 __u16 w2;
507 __u32 w4;
508 __u64 w8;
509 switch (size) {
510 case 1:
511 w1 = word;
512 diag = kdb_putarea(addr, w1);
513 break;
514 case 2:
515 w2 = word;
516 diag = kdb_putarea(addr, w2);
517 break;
518 case 4:
519 w4 = word;
520 diag = kdb_putarea(addr, w4);
521 break;
522 case 8:
523 if (size <= sizeof(word)) {
524 w8 = word;
525 diag = kdb_putarea(addr, w8);
526 break;
527 }
528 /* drop through */
529 default:
530 diag = KDB_BADWIDTH;
531 kdb_printf("kdb_putword: bad width %ld\n", (long) size);
532 }
533 return diag;
534}
535
536/*
537 * kdb_task_state_string - Convert a string containing any of the
538 * letters DRSTCZEUIMA to a mask for the process state field and
539 * return the value. If no argument is supplied, return the mask
540 * that corresponds to environment variable PS, DRSTCZEU by
541 * default.
542 * Inputs:
543 * s String to convert
544 * Returns:
545 * Mask for process state.
546 * Notes:
547 * The mask folds data from several sources into a single long value, so
548 * be carefull not to overlap the bits. TASK_* bits are in the LSB,
549 * special cases like UNRUNNABLE are in the MSB. As of 2.6.10-rc1 there
550 * is no overlap between TASK_* and EXIT_* but that may not always be
551 * true, so EXIT_* bits are shifted left 16 bits before being stored in
552 * the mask.
553 */
554
555/* unrunnable is < 0 */
556#define UNRUNNABLE (1UL << (8*sizeof(unsigned long) - 1))
557#define RUNNING (1UL << (8*sizeof(unsigned long) - 2))
558#define IDLE (1UL << (8*sizeof(unsigned long) - 3))
559#define DAEMON (1UL << (8*sizeof(unsigned long) - 4))
560
561unsigned long kdb_task_state_string(const char *s)
562{
563 long res = 0;
564 if (!s) {
565 s = kdbgetenv("PS");
566 if (!s)
567 s = "DRSTCZEU"; /* default value for ps */
568 }
569 while (*s) {
570 switch (*s) {
571 case 'D':
572 res |= TASK_UNINTERRUPTIBLE;
573 break;
574 case 'R':
575 res |= RUNNING;
576 break;
577 case 'S':
578 res |= TASK_INTERRUPTIBLE;
579 break;
580 case 'T':
581 res |= TASK_STOPPED;
582 break;
583 case 'C':
584 res |= TASK_TRACED;
585 break;
586 case 'Z':
587 res |= EXIT_ZOMBIE << 16;
588 break;
589 case 'E':
590 res |= EXIT_DEAD << 16;
591 break;
592 case 'U':
593 res |= UNRUNNABLE;
594 break;
595 case 'I':
596 res |= IDLE;
597 break;
598 case 'M':
599 res |= DAEMON;
600 break;
601 case 'A':
602 res = ~0UL;
603 break;
604 default:
605 kdb_printf("%s: unknown flag '%c' ignored\n",
606 __func__, *s);
607 break;
608 }
609 ++s;
610 }
611 return res;
612}
613
614/*
615 * kdb_task_state_char - Return the character that represents the task state.
616 * Inputs:
617 * p struct task for the process
618 * Returns:
619 * One character to represent the task state.
620 */
621char kdb_task_state_char (const struct task_struct *p)
622{
623 int cpu;
624 char state;
625 unsigned long tmp;
626
627 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
628 return 'E';
629
630 cpu = kdb_process_cpu(p);
631 state = (p->state == 0) ? 'R' :
632 (p->state < 0) ? 'U' :
633 (p->state & TASK_UNINTERRUPTIBLE) ? 'D' :
634 (p->state & TASK_STOPPED) ? 'T' :
635 (p->state & TASK_TRACED) ? 'C' :
636 (p->exit_state & EXIT_ZOMBIE) ? 'Z' :
637 (p->exit_state & EXIT_DEAD) ? 'E' :
638 (p->state & TASK_INTERRUPTIBLE) ? 'S' : '?';
639 if (p->pid == 0) {
640 /* Idle task. Is it really idle, apart from the kdb
641 * interrupt? */
642 if (!kdb_task_has_cpu(p) || kgdb_info[cpu].irq_depth == 1) {
643 if (cpu != kdb_initial_cpu)
644 state = 'I'; /* idle task */
645 }
646 } else if (!p->mm && state == 'S') {
647 state = 'M'; /* sleeping system daemon */
648 }
649 return state;
650}
651
652/*
653 * kdb_task_state - Return true if a process has the desired state
654 * given by the mask.
655 * Inputs:
656 * p struct task for the process
657 * mask mask from kdb_task_state_string to select processes
658 * Returns:
659 * True if the process matches at least one criteria defined by the mask.
660 */
661unsigned long kdb_task_state(const struct task_struct *p, unsigned long mask)
662{
663 char state[] = { kdb_task_state_char(p), '\0' };
664 return (mask & kdb_task_state_string(state)) != 0;
665}
666
667/*
668 * kdb_print_nameval - Print a name and its value, converting the
669 * value to a symbol lookup if possible.
670 * Inputs:
671 * name field name to print
672 * val value of field
673 */
674void kdb_print_nameval(const char *name, unsigned long val)
675{
676 kdb_symtab_t symtab;
677 kdb_printf(" %-11.11s ", name);
678 if (kdbnearsym(val, &symtab))
679 kdb_symbol_print(val, &symtab,
680 KDB_SP_VALUE|KDB_SP_SYMSIZE|KDB_SP_NEWLINE);
681 else
682 kdb_printf("0x%lx\n", val);
683}
684
685/* Last ditch allocator for debugging, so we can still debug even when
686 * the GFP_ATOMIC pool has been exhausted. The algorithms are tuned
687 * for space usage, not for speed. One smallish memory pool, the free
688 * chain is always in ascending address order to allow coalescing,
689 * allocations are done in brute force best fit.
690 */
691
692struct debug_alloc_header {
693 u32 next; /* offset of next header from start of pool */
694 u32 size;
695 void *caller;
696};
697
698/* The memory returned by this allocator must be aligned, which means
699 * so must the header size. Do not assume that sizeof(struct
700 * debug_alloc_header) is a multiple of the alignment, explicitly
701 * calculate the overhead of this header, including the alignment.
702 * The rest of this code must not use sizeof() on any header or
703 * pointer to a header.
704 */
705#define dah_align 8
706#define dah_overhead ALIGN(sizeof(struct debug_alloc_header), dah_align)
707
708static u64 debug_alloc_pool_aligned[256*1024/dah_align]; /* 256K pool */
709static char *debug_alloc_pool = (char *)debug_alloc_pool_aligned;
710static u32 dah_first, dah_first_call = 1, dah_used, dah_used_max;
711
712/* Locking is awkward. The debug code is called from all contexts,
713 * including non maskable interrupts. A normal spinlock is not safe
714 * in NMI context. Try to get the debug allocator lock, if it cannot
715 * be obtained after a second then give up. If the lock could not be
716 * previously obtained on this cpu then only try once.
717 *
718 * sparse has no annotation for "this function _sometimes_ acquires a
719 * lock", so fudge the acquire/release notation.
720 */
721static DEFINE_SPINLOCK(dap_lock);
722static int get_dap_lock(void)
723 __acquires(dap_lock)
724{
725 static int dap_locked = -1;
726 int count;
727 if (dap_locked == smp_processor_id())
728 count = 1;
729 else
730 count = 1000;
731 while (1) {
732 if (spin_trylock(&dap_lock)) {
733 dap_locked = -1;
734 return 1;
735 }
736 if (!count--)
737 break;
738 udelay(1000);
739 }
740 dap_locked = smp_processor_id();
741 __acquire(dap_lock);
742 return 0;
743}
744
745void *debug_kmalloc(size_t size, gfp_t flags)
746{
747 unsigned int rem, h_offset;
748 struct debug_alloc_header *best, *bestprev, *prev, *h;
749 void *p = NULL;
750 if (!get_dap_lock()) {
751 __release(dap_lock); /* we never actually got it */
752 return NULL;
753 }
754 h = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
755 if (dah_first_call) {
756 h->size = sizeof(debug_alloc_pool_aligned) - dah_overhead;
757 dah_first_call = 0;
758 }
759 size = ALIGN(size, dah_align);
760 prev = best = bestprev = NULL;
761 while (1) {
762 if (h->size >= size && (!best || h->size < best->size)) {
763 best = h;
764 bestprev = prev;
765 if (h->size == size)
766 break;
767 }
768 if (!h->next)
769 break;
770 prev = h;
771 h = (struct debug_alloc_header *)(debug_alloc_pool + h->next);
772 }
773 if (!best)
774 goto out;
775 rem = best->size - size;
776 /* The pool must always contain at least one header */
777 if (best->next == 0 && bestprev == NULL && rem < dah_overhead)
778 goto out;
779 if (rem >= dah_overhead) {
780 best->size = size;
781 h_offset = ((char *)best - debug_alloc_pool) +
782 dah_overhead + best->size;
783 h = (struct debug_alloc_header *)(debug_alloc_pool + h_offset);
784 h->size = rem - dah_overhead;
785 h->next = best->next;
786 } else
787 h_offset = best->next;
788 best->caller = __builtin_return_address(0);
789 dah_used += best->size;
790 dah_used_max = max(dah_used, dah_used_max);
791 if (bestprev)
792 bestprev->next = h_offset;
793 else
794 dah_first = h_offset;
795 p = (char *)best + dah_overhead;
796 memset(p, POISON_INUSE, best->size - 1);
797 *((char *)p + best->size - 1) = POISON_END;
798out:
799 spin_unlock(&dap_lock);
800 return p;
801}
802
803void debug_kfree(void *p)
804{
805 struct debug_alloc_header *h;
806 unsigned int h_offset;
807 if (!p)
808 return;
809 if ((char *)p < debug_alloc_pool ||
810 (char *)p >= debug_alloc_pool + sizeof(debug_alloc_pool_aligned)) {
811 kfree(p);
812 return;
813 }
814 if (!get_dap_lock()) {
815 __release(dap_lock); /* we never actually got it */
816 return; /* memory leak, cannot be helped */
817 }
818 h = (struct debug_alloc_header *)((char *)p - dah_overhead);
819 memset(p, POISON_FREE, h->size - 1);
820 *((char *)p + h->size - 1) = POISON_END;
821 h->caller = NULL;
822 dah_used -= h->size;
823 h_offset = (char *)h - debug_alloc_pool;
824 if (h_offset < dah_first) {
825 h->next = dah_first;
826 dah_first = h_offset;
827 } else {
828 struct debug_alloc_header *prev;
829 unsigned int prev_offset;
830 prev = (struct debug_alloc_header *)(debug_alloc_pool +
831 dah_first);
832 while (1) {
833 if (!prev->next || prev->next > h_offset)
834 break;
835 prev = (struct debug_alloc_header *)
836 (debug_alloc_pool + prev->next);
837 }
838 prev_offset = (char *)prev - debug_alloc_pool;
839 if (prev_offset + dah_overhead + prev->size == h_offset) {
840 prev->size += dah_overhead + h->size;
841 memset(h, POISON_FREE, dah_overhead - 1);
842 *((char *)h + dah_overhead - 1) = POISON_END;
843 h = prev;
844 h_offset = prev_offset;
845 } else {
846 h->next = prev->next;
847 prev->next = h_offset;
848 }
849 }
850 if (h_offset + dah_overhead + h->size == h->next) {
851 struct debug_alloc_header *next;
852 next = (struct debug_alloc_header *)
853 (debug_alloc_pool + h->next);
854 h->size += dah_overhead + next->size;
855 h->next = next->next;
856 memset(next, POISON_FREE, dah_overhead - 1);
857 *((char *)next + dah_overhead - 1) = POISON_END;
858 }
859 spin_unlock(&dap_lock);
860}
861
862void debug_kusage(void)
863{
864 struct debug_alloc_header *h_free, *h_used;
865#ifdef CONFIG_IA64
866 /* FIXME: using dah for ia64 unwind always results in a memory leak.
867 * Fix that memory leak first, then set debug_kusage_one_time = 1 for
868 * all architectures.
869 */
870 static int debug_kusage_one_time;
871#else
872 static int debug_kusage_one_time = 1;
873#endif
874 if (!get_dap_lock()) {
875 __release(dap_lock); /* we never actually got it */
876 return;
877 }
878 h_free = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
879 if (dah_first == 0 &&
880 (h_free->size == sizeof(debug_alloc_pool_aligned) - dah_overhead ||
881 dah_first_call))
882 goto out;
883 if (!debug_kusage_one_time)
884 goto out;
885 debug_kusage_one_time = 0;
886 kdb_printf("%s: debug_kmalloc memory leak dah_first %d\n",
887 __func__, dah_first);
888 if (dah_first) {
889 h_used = (struct debug_alloc_header *)debug_alloc_pool;
890 kdb_printf("%s: h_used %p size %d\n", __func__, h_used,
891 h_used->size);
892 }
893 do {
894 h_used = (struct debug_alloc_header *)
895 ((char *)h_free + dah_overhead + h_free->size);
896 kdb_printf("%s: h_used %p size %d caller %p\n",
897 __func__, h_used, h_used->size, h_used->caller);
898 h_free = (struct debug_alloc_header *)
899 (debug_alloc_pool + h_free->next);
900 } while (h_free->next);
901 h_used = (struct debug_alloc_header *)
902 ((char *)h_free + dah_overhead + h_free->size);
903 if ((char *)h_used - debug_alloc_pool !=
904 sizeof(debug_alloc_pool_aligned))
905 kdb_printf("%s: h_used %p size %d caller %p\n",
906 __func__, h_used, h_used->size, h_used->caller);
907out:
908 spin_unlock(&dap_lock);
909}
910
911/* Maintain a small stack of kdb_flags to allow recursion without disturbing
912 * the global kdb state.
913 */
914
915static int kdb_flags_stack[4], kdb_flags_index;
916
917void kdb_save_flags(void)
918{
919 BUG_ON(kdb_flags_index >= ARRAY_SIZE(kdb_flags_stack));
920 kdb_flags_stack[kdb_flags_index++] = kdb_flags;
921}
922
923void kdb_restore_flags(void)
924{
925 BUG_ON(kdb_flags_index <= 0);
926 kdb_flags = kdb_flags_stack[--kdb_flags_index];
927}
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 13aff293f4de..6f6d091b5757 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -16,6 +16,7 @@
16#include <linux/init.h> 16#include <linux/init.h>
17#include <linux/seq_file.h> 17#include <linux/seq_file.h>
18#include <linux/fs.h> 18#include <linux/fs.h>
19#include <linux/kdb.h>
19#include <linux/err.h> 20#include <linux/err.h>
20#include <linux/proc_fs.h> 21#include <linux/proc_fs.h>
21#include <linux/sched.h> /* for cond_resched */ 22#include <linux/sched.h> /* for cond_resched */
@@ -516,6 +517,26 @@ static int kallsyms_open(struct inode *inode, struct file *file)
516 return ret; 517 return ret;
517} 518}
518 519
520#ifdef CONFIG_KGDB_KDB
521const char *kdb_walk_kallsyms(loff_t *pos)
522{
523 static struct kallsym_iter kdb_walk_kallsyms_iter;
524 if (*pos == 0) {
525 memset(&kdb_walk_kallsyms_iter, 0,
526 sizeof(kdb_walk_kallsyms_iter));
527 reset_iter(&kdb_walk_kallsyms_iter, 0);
528 }
529 while (1) {
530 if (!update_iter(&kdb_walk_kallsyms_iter, *pos))
531 return NULL;
532 ++*pos;
533 /* Some debugging symbols have no name. Ignore them. */
534 if (kdb_walk_kallsyms_iter.name[0])
535 return kdb_walk_kallsyms_iter.name;
536 }
537}
538#endif /* CONFIG_KGDB_KDB */
539
519static const struct file_operations kallsyms_operations = { 540static const struct file_operations kallsyms_operations = {
520 .open = kallsyms_open, 541 .open = kallsyms_open,
521 .read = seq_read, 542 .read = seq_read,
diff --git a/kernel/kgdb.c b/kernel/kgdb.c
deleted file mode 100644
index 11f3515ca83f..000000000000
--- a/kernel/kgdb.c
+++ /dev/null
@@ -1,1764 +0,0 @@
1/*
2 * KGDB stub.
3 *
4 * Maintainer: Jason Wessel <jason.wessel@windriver.com>
5 *
6 * Copyright (C) 2000-2001 VERITAS Software Corporation.
7 * Copyright (C) 2002-2004 Timesys Corporation
8 * Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
9 * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
10 * Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
11 * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
12 * Copyright (C) 2005-2008 Wind River Systems, Inc.
13 * Copyright (C) 2007 MontaVista Software, Inc.
14 * Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
15 *
16 * Contributors at various stages not listed above:
17 * Jason Wessel ( jason.wessel@windriver.com )
18 * George Anzinger <george@mvista.com>
19 * Anurekh Saxena (anurekh.saxena@timesys.com)
20 * Lake Stevens Instrument Division (Glenn Engel)
21 * Jim Kingdon, Cygnus Support.
22 *
23 * Original KGDB stub: David Grothe <dave@gcom.com>,
24 * Tigran Aivazian <tigran@sco.com>
25 *
26 * This file is licensed under the terms of the GNU General Public License
27 * version 2. This program is licensed "as is" without any warranty of any
28 * kind, whether express or implied.
29 */
30#include <linux/pid_namespace.h>
31#include <linux/clocksource.h>
32#include <linux/interrupt.h>
33#include <linux/spinlock.h>
34#include <linux/console.h>
35#include <linux/threads.h>
36#include <linux/uaccess.h>
37#include <linux/kernel.h>
38#include <linux/module.h>
39#include <linux/ptrace.h>
40#include <linux/reboot.h>
41#include <linux/string.h>
42#include <linux/delay.h>
43#include <linux/sched.h>
44#include <linux/sysrq.h>
45#include <linux/init.h>
46#include <linux/kgdb.h>
47#include <linux/pid.h>
48#include <linux/smp.h>
49#include <linux/mm.h>
50
51#include <asm/cacheflush.h>
52#include <asm/byteorder.h>
53#include <asm/atomic.h>
54#include <asm/system.h>
55#include <asm/unaligned.h>
56
57static int kgdb_break_asap;
58
59#define KGDB_MAX_THREAD_QUERY 17
60struct kgdb_state {
61 int ex_vector;
62 int signo;
63 int err_code;
64 int cpu;
65 int pass_exception;
66 unsigned long thr_query;
67 unsigned long threadid;
68 long kgdb_usethreadid;
69 struct pt_regs *linux_regs;
70};
71
72/* Exception state values */
73#define DCPU_WANT_MASTER 0x1 /* Waiting to become a master kgdb cpu */
74#define DCPU_NEXT_MASTER 0x2 /* Transition from one master cpu to another */
75#define DCPU_IS_SLAVE 0x4 /* Slave cpu enter exception */
76#define DCPU_SSTEP 0x8 /* CPU is single stepping */
77
78static struct debuggerinfo_struct {
79 void *debuggerinfo;
80 struct task_struct *task;
81 int exception_state;
82} kgdb_info[NR_CPUS];
83
84/**
85 * kgdb_connected - Is a host GDB connected to us?
86 */
87int kgdb_connected;
88EXPORT_SYMBOL_GPL(kgdb_connected);
89
90/* All the KGDB handlers are installed */
91static int kgdb_io_module_registered;
92
93/* Guard for recursive entry */
94static int exception_level;
95
96static struct kgdb_io *kgdb_io_ops;
97static DEFINE_SPINLOCK(kgdb_registration_lock);
98
99/* kgdb console driver is loaded */
100static int kgdb_con_registered;
101/* determine if kgdb console output should be used */
102static int kgdb_use_con;
103
104static int __init opt_kgdb_con(char *str)
105{
106 kgdb_use_con = 1;
107 return 0;
108}
109
110early_param("kgdbcon", opt_kgdb_con);
111
112module_param(kgdb_use_con, int, 0644);
113
114/*
115 * Holds information about breakpoints in a kernel. These breakpoints are
116 * added and removed by gdb.
117 */
118static struct kgdb_bkpt kgdb_break[KGDB_MAX_BREAKPOINTS] = {
119 [0 ... KGDB_MAX_BREAKPOINTS-1] = { .state = BP_UNDEFINED }
120};
121
122/*
123 * The CPU# of the active CPU, or -1 if none:
124 */
125atomic_t kgdb_active = ATOMIC_INIT(-1);
126
127/*
128 * We use NR_CPUs not PERCPU, in case kgdb is used to debug early
129 * bootup code (which might not have percpu set up yet):
130 */
131static atomic_t passive_cpu_wait[NR_CPUS];
132static atomic_t cpu_in_kgdb[NR_CPUS];
133atomic_t kgdb_setting_breakpoint;
134
135struct task_struct *kgdb_usethread;
136struct task_struct *kgdb_contthread;
137
138int kgdb_single_step;
139pid_t kgdb_sstep_pid;
140
141/* Our I/O buffers. */
142static char remcom_in_buffer[BUFMAX];
143static char remcom_out_buffer[BUFMAX];
144
145/* Storage for the registers, in GDB format. */
146static unsigned long gdb_regs[(NUMREGBYTES +
147 sizeof(unsigned long) - 1) /
148 sizeof(unsigned long)];
149
150/* to keep track of the CPU which is doing the single stepping*/
151atomic_t kgdb_cpu_doing_single_step = ATOMIC_INIT(-1);
152
153/*
154 * If you are debugging a problem where roundup (the collection of
155 * all other CPUs) is a problem [this should be extremely rare],
156 * then use the nokgdbroundup option to avoid roundup. In that case
157 * the other CPUs might interfere with your debugging context, so
158 * use this with care:
159 */
160static int kgdb_do_roundup = 1;
161
162static int __init opt_nokgdbroundup(char *str)
163{
164 kgdb_do_roundup = 0;
165
166 return 0;
167}
168
169early_param("nokgdbroundup", opt_nokgdbroundup);
170
171/*
172 * Finally, some KGDB code :-)
173 */
174
175/*
176 * Weak aliases for breakpoint management,
177 * can be overriden by architectures when needed:
178 */
179int __weak kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)
180{
181 int err;
182
183 err = probe_kernel_read(saved_instr, (char *)addr, BREAK_INSTR_SIZE);
184 if (err)
185 return err;
186
187 return probe_kernel_write((char *)addr, arch_kgdb_ops.gdb_bpt_instr,
188 BREAK_INSTR_SIZE);
189}
190
191int __weak kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
192{
193 return probe_kernel_write((char *)addr,
194 (char *)bundle, BREAK_INSTR_SIZE);
195}
196
197int __weak kgdb_validate_break_address(unsigned long addr)
198{
199 char tmp_variable[BREAK_INSTR_SIZE];
200 int err;
201 /* Validate setting the breakpoint and then removing it. In the
202 * remove fails, the kernel needs to emit a bad message because we
203 * are deep trouble not being able to put things back the way we
204 * found them.
205 */
206 err = kgdb_arch_set_breakpoint(addr, tmp_variable);
207 if (err)
208 return err;
209 err = kgdb_arch_remove_breakpoint(addr, tmp_variable);
210 if (err)
211 printk(KERN_ERR "KGDB: Critical breakpoint error, kernel "
212 "memory destroyed at: %lx", addr);
213 return err;
214}
215
216unsigned long __weak kgdb_arch_pc(int exception, struct pt_regs *regs)
217{
218 return instruction_pointer(regs);
219}
220
221int __weak kgdb_arch_init(void)
222{
223 return 0;
224}
225
226int __weak kgdb_skipexception(int exception, struct pt_regs *regs)
227{
228 return 0;
229}
230
231void __weak
232kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
233{
234 return;
235}
236
237/**
238 * kgdb_disable_hw_debug - Disable hardware debugging while we in kgdb.
239 * @regs: Current &struct pt_regs.
240 *
241 * This function will be called if the particular architecture must
242 * disable hardware debugging while it is processing gdb packets or
243 * handling exception.
244 */
245void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
246{
247}
248
249/*
250 * GDB remote protocol parser:
251 */
252
253static int hex(char ch)
254{
255 if ((ch >= 'a') && (ch <= 'f'))
256 return ch - 'a' + 10;
257 if ((ch >= '0') && (ch <= '9'))
258 return ch - '0';
259 if ((ch >= 'A') && (ch <= 'F'))
260 return ch - 'A' + 10;
261 return -1;
262}
263
264/* scan for the sequence $<data>#<checksum> */
265static void get_packet(char *buffer)
266{
267 unsigned char checksum;
268 unsigned char xmitcsum;
269 int count;
270 char ch;
271
272 do {
273 /*
274 * Spin and wait around for the start character, ignore all
275 * other characters:
276 */
277 while ((ch = (kgdb_io_ops->read_char())) != '$')
278 /* nothing */;
279
280 kgdb_connected = 1;
281 checksum = 0;
282 xmitcsum = -1;
283
284 count = 0;
285
286 /*
287 * now, read until a # or end of buffer is found:
288 */
289 while (count < (BUFMAX - 1)) {
290 ch = kgdb_io_ops->read_char();
291 if (ch == '#')
292 break;
293 checksum = checksum + ch;
294 buffer[count] = ch;
295 count = count + 1;
296 }
297 buffer[count] = 0;
298
299 if (ch == '#') {
300 xmitcsum = hex(kgdb_io_ops->read_char()) << 4;
301 xmitcsum += hex(kgdb_io_ops->read_char());
302
303 if (checksum != xmitcsum)
304 /* failed checksum */
305 kgdb_io_ops->write_char('-');
306 else
307 /* successful transfer */
308 kgdb_io_ops->write_char('+');
309 if (kgdb_io_ops->flush)
310 kgdb_io_ops->flush();
311 }
312 } while (checksum != xmitcsum);
313}
314
315/*
316 * Send the packet in buffer.
317 * Check for gdb connection if asked for.
318 */
319static void put_packet(char *buffer)
320{
321 unsigned char checksum;
322 int count;
323 char ch;
324
325 /*
326 * $<packet info>#<checksum>.
327 */
328 while (1) {
329 kgdb_io_ops->write_char('$');
330 checksum = 0;
331 count = 0;
332
333 while ((ch = buffer[count])) {
334 kgdb_io_ops->write_char(ch);
335 checksum += ch;
336 count++;
337 }
338
339 kgdb_io_ops->write_char('#');
340 kgdb_io_ops->write_char(hex_asc_hi(checksum));
341 kgdb_io_ops->write_char(hex_asc_lo(checksum));
342 if (kgdb_io_ops->flush)
343 kgdb_io_ops->flush();
344
345 /* Now see what we get in reply. */
346 ch = kgdb_io_ops->read_char();
347
348 if (ch == 3)
349 ch = kgdb_io_ops->read_char();
350
351 /* If we get an ACK, we are done. */
352 if (ch == '+')
353 return;
354
355 /*
356 * If we get the start of another packet, this means
357 * that GDB is attempting to reconnect. We will NAK
358 * the packet being sent, and stop trying to send this
359 * packet.
360 */
361 if (ch == '$') {
362 kgdb_io_ops->write_char('-');
363 if (kgdb_io_ops->flush)
364 kgdb_io_ops->flush();
365 return;
366 }
367 }
368}
369
370/*
371 * Convert the memory pointed to by mem into hex, placing result in buf.
372 * Return a pointer to the last char put in buf (null). May return an error.
373 */
374int kgdb_mem2hex(char *mem, char *buf, int count)
375{
376 char *tmp;
377 int err;
378
379 /*
380 * We use the upper half of buf as an intermediate buffer for the
381 * raw memory copy. Hex conversion will work against this one.
382 */
383 tmp = buf + count;
384
385 err = probe_kernel_read(tmp, mem, count);
386 if (!err) {
387 while (count > 0) {
388 buf = pack_hex_byte(buf, *tmp);
389 tmp++;
390 count--;
391 }
392
393 *buf = 0;
394 }
395
396 return err;
397}
398
399/*
400 * Copy the binary array pointed to by buf into mem. Fix $, #, and
401 * 0x7d escaped with 0x7d. Return -EFAULT on failure or 0 on success.
402 * The input buf is overwitten with the result to write to mem.
403 */
404static int kgdb_ebin2mem(char *buf, char *mem, int count)
405{
406 int size = 0;
407 char *c = buf;
408
409 while (count-- > 0) {
410 c[size] = *buf++;
411 if (c[size] == 0x7d)
412 c[size] = *buf++ ^ 0x20;
413 size++;
414 }
415
416 return probe_kernel_write(mem, c, size);
417}
418
419/*
420 * Convert the hex array pointed to by buf into binary to be placed in mem.
421 * Return a pointer to the character AFTER the last byte written.
422 * May return an error.
423 */
424int kgdb_hex2mem(char *buf, char *mem, int count)
425{
426 char *tmp_raw;
427 char *tmp_hex;
428
429 /*
430 * We use the upper half of buf as an intermediate buffer for the
431 * raw memory that is converted from hex.
432 */
433 tmp_raw = buf + count * 2;
434
435 tmp_hex = tmp_raw - 1;
436 while (tmp_hex >= buf) {
437 tmp_raw--;
438 *tmp_raw = hex(*tmp_hex--);
439 *tmp_raw |= hex(*tmp_hex--) << 4;
440 }
441
442 return probe_kernel_write(mem, tmp_raw, count);
443}
444
445/*
446 * While we find nice hex chars, build a long_val.
447 * Return number of chars processed.
448 */
449int kgdb_hex2long(char **ptr, unsigned long *long_val)
450{
451 int hex_val;
452 int num = 0;
453 int negate = 0;
454
455 *long_val = 0;
456
457 if (**ptr == '-') {
458 negate = 1;
459 (*ptr)++;
460 }
461 while (**ptr) {
462 hex_val = hex(**ptr);
463 if (hex_val < 0)
464 break;
465
466 *long_val = (*long_val << 4) | hex_val;
467 num++;
468 (*ptr)++;
469 }
470
471 if (negate)
472 *long_val = -*long_val;
473
474 return num;
475}
476
477/* Write memory due to an 'M' or 'X' packet. */
478static int write_mem_msg(int binary)
479{
480 char *ptr = &remcom_in_buffer[1];
481 unsigned long addr;
482 unsigned long length;
483 int err;
484
485 if (kgdb_hex2long(&ptr, &addr) > 0 && *(ptr++) == ',' &&
486 kgdb_hex2long(&ptr, &length) > 0 && *(ptr++) == ':') {
487 if (binary)
488 err = kgdb_ebin2mem(ptr, (char *)addr, length);
489 else
490 err = kgdb_hex2mem(ptr, (char *)addr, length);
491 if (err)
492 return err;
493 if (CACHE_FLUSH_IS_SAFE)
494 flush_icache_range(addr, addr + length);
495 return 0;
496 }
497
498 return -EINVAL;
499}
500
501static void error_packet(char *pkt, int error)
502{
503 error = -error;
504 pkt[0] = 'E';
505 pkt[1] = hex_asc[(error / 10)];
506 pkt[2] = hex_asc[(error % 10)];
507 pkt[3] = '\0';
508}
509
510/*
511 * Thread ID accessors. We represent a flat TID space to GDB, where
512 * the per CPU idle threads (which under Linux all have PID 0) are
513 * remapped to negative TIDs.
514 */
515
516#define BUF_THREAD_ID_SIZE 16
517
518static char *pack_threadid(char *pkt, unsigned char *id)
519{
520 char *limit;
521
522 limit = pkt + BUF_THREAD_ID_SIZE;
523 while (pkt < limit)
524 pkt = pack_hex_byte(pkt, *id++);
525
526 return pkt;
527}
528
529static void int_to_threadref(unsigned char *id, int value)
530{
531 unsigned char *scan;
532 int i = 4;
533
534 scan = (unsigned char *)id;
535 while (i--)
536 *scan++ = 0;
537 put_unaligned_be32(value, scan);
538}
539
540static struct task_struct *getthread(struct pt_regs *regs, int tid)
541{
542 /*
543 * Non-positive TIDs are remapped to the cpu shadow information
544 */
545 if (tid == 0 || tid == -1)
546 tid = -atomic_read(&kgdb_active) - 2;
547 if (tid < -1 && tid > -NR_CPUS - 2) {
548 if (kgdb_info[-tid - 2].task)
549 return kgdb_info[-tid - 2].task;
550 else
551 return idle_task(-tid - 2);
552 }
553 if (tid <= 0) {
554 printk(KERN_ERR "KGDB: Internal thread select error\n");
555 dump_stack();
556 return NULL;
557 }
558
559 /*
560 * find_task_by_pid_ns() does not take the tasklist lock anymore
561 * but is nicely RCU locked - hence is a pretty resilient
562 * thing to use:
563 */
564 return find_task_by_pid_ns(tid, &init_pid_ns);
565}
566
567/*
568 * Some architectures need cache flushes when we set/clear a
569 * breakpoint:
570 */
571static void kgdb_flush_swbreak_addr(unsigned long addr)
572{
573 if (!CACHE_FLUSH_IS_SAFE)
574 return;
575
576 if (current->mm && current->mm->mmap_cache) {
577 flush_cache_range(current->mm->mmap_cache,
578 addr, addr + BREAK_INSTR_SIZE);
579 }
580 /* Force flush instruction cache if it was outside the mm */
581 flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
582}
583
584/*
585 * SW breakpoint management:
586 */
587static int kgdb_activate_sw_breakpoints(void)
588{
589 unsigned long addr;
590 int error;
591 int ret = 0;
592 int i;
593
594 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
595 if (kgdb_break[i].state != BP_SET)
596 continue;
597
598 addr = kgdb_break[i].bpt_addr;
599 error = kgdb_arch_set_breakpoint(addr,
600 kgdb_break[i].saved_instr);
601 if (error) {
602 ret = error;
603 printk(KERN_INFO "KGDB: BP install failed: %lx", addr);
604 continue;
605 }
606
607 kgdb_flush_swbreak_addr(addr);
608 kgdb_break[i].state = BP_ACTIVE;
609 }
610 return ret;
611}
612
613static int kgdb_set_sw_break(unsigned long addr)
614{
615 int err = kgdb_validate_break_address(addr);
616 int breakno = -1;
617 int i;
618
619 if (err)
620 return err;
621
622 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
623 if ((kgdb_break[i].state == BP_SET) &&
624 (kgdb_break[i].bpt_addr == addr))
625 return -EEXIST;
626 }
627 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
628 if (kgdb_break[i].state == BP_REMOVED &&
629 kgdb_break[i].bpt_addr == addr) {
630 breakno = i;
631 break;
632 }
633 }
634
635 if (breakno == -1) {
636 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
637 if (kgdb_break[i].state == BP_UNDEFINED) {
638 breakno = i;
639 break;
640 }
641 }
642 }
643
644 if (breakno == -1)
645 return -E2BIG;
646
647 kgdb_break[breakno].state = BP_SET;
648 kgdb_break[breakno].type = BP_BREAKPOINT;
649 kgdb_break[breakno].bpt_addr = addr;
650
651 return 0;
652}
653
654static int kgdb_deactivate_sw_breakpoints(void)
655{
656 unsigned long addr;
657 int error;
658 int ret = 0;
659 int i;
660
661 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
662 if (kgdb_break[i].state != BP_ACTIVE)
663 continue;
664 addr = kgdb_break[i].bpt_addr;
665 error = kgdb_arch_remove_breakpoint(addr,
666 kgdb_break[i].saved_instr);
667 if (error) {
668 printk(KERN_INFO "KGDB: BP remove failed: %lx\n", addr);
669 ret = error;
670 }
671
672 kgdb_flush_swbreak_addr(addr);
673 kgdb_break[i].state = BP_SET;
674 }
675 return ret;
676}
677
678static int kgdb_remove_sw_break(unsigned long addr)
679{
680 int i;
681
682 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
683 if ((kgdb_break[i].state == BP_SET) &&
684 (kgdb_break[i].bpt_addr == addr)) {
685 kgdb_break[i].state = BP_REMOVED;
686 return 0;
687 }
688 }
689 return -ENOENT;
690}
691
692int kgdb_isremovedbreak(unsigned long addr)
693{
694 int i;
695
696 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
697 if ((kgdb_break[i].state == BP_REMOVED) &&
698 (kgdb_break[i].bpt_addr == addr))
699 return 1;
700 }
701 return 0;
702}
703
704static int remove_all_break(void)
705{
706 unsigned long addr;
707 int error;
708 int i;
709
710 /* Clear memory breakpoints. */
711 for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
712 if (kgdb_break[i].state != BP_ACTIVE)
713 goto setundefined;
714 addr = kgdb_break[i].bpt_addr;
715 error = kgdb_arch_remove_breakpoint(addr,
716 kgdb_break[i].saved_instr);
717 if (error)
718 printk(KERN_ERR "KGDB: breakpoint remove failed: %lx\n",
719 addr);
720setundefined:
721 kgdb_break[i].state = BP_UNDEFINED;
722 }
723
724 /* Clear hardware breakpoints. */
725 if (arch_kgdb_ops.remove_all_hw_break)
726 arch_kgdb_ops.remove_all_hw_break();
727
728 return 0;
729}
730
731/*
732 * Remap normal tasks to their real PID,
733 * CPU shadow threads are mapped to -CPU - 2
734 */
735static inline int shadow_pid(int realpid)
736{
737 if (realpid)
738 return realpid;
739
740 return -raw_smp_processor_id() - 2;
741}
742
743static char gdbmsgbuf[BUFMAX + 1];
744
745static void kgdb_msg_write(const char *s, int len)
746{
747 char *bufptr;
748 int wcount;
749 int i;
750
751 /* 'O'utput */
752 gdbmsgbuf[0] = 'O';
753
754 /* Fill and send buffers... */
755 while (len > 0) {
756 bufptr = gdbmsgbuf + 1;
757
758 /* Calculate how many this time */
759 if ((len << 1) > (BUFMAX - 2))
760 wcount = (BUFMAX - 2) >> 1;
761 else
762 wcount = len;
763
764 /* Pack in hex chars */
765 for (i = 0; i < wcount; i++)
766 bufptr = pack_hex_byte(bufptr, s[i]);
767 *bufptr = '\0';
768
769 /* Move up */
770 s += wcount;
771 len -= wcount;
772
773 /* Write packet */
774 put_packet(gdbmsgbuf);
775 }
776}
777
778/*
779 * Return true if there is a valid kgdb I/O module. Also if no
780 * debugger is attached a message can be printed to the console about
781 * waiting for the debugger to attach.
782 *
783 * The print_wait argument is only to be true when called from inside
784 * the core kgdb_handle_exception, because it will wait for the
785 * debugger to attach.
786 */
787static int kgdb_io_ready(int print_wait)
788{
789 if (!kgdb_io_ops)
790 return 0;
791 if (kgdb_connected)
792 return 1;
793 if (atomic_read(&kgdb_setting_breakpoint))
794 return 1;
795 if (print_wait)
796 printk(KERN_CRIT "KGDB: Waiting for remote debugger\n");
797 return 1;
798}
799
800/*
801 * All the functions that start with gdb_cmd are the various
802 * operations to implement the handlers for the gdbserial protocol
803 * where KGDB is communicating with an external debugger
804 */
805
806/* Handle the '?' status packets */
807static void gdb_cmd_status(struct kgdb_state *ks)
808{
809 /*
810 * We know that this packet is only sent
811 * during initial connect. So to be safe,
812 * we clear out our breakpoints now in case
813 * GDB is reconnecting.
814 */
815 remove_all_break();
816
817 remcom_out_buffer[0] = 'S';
818 pack_hex_byte(&remcom_out_buffer[1], ks->signo);
819}
820
821/* Handle the 'g' get registers request */
822static void gdb_cmd_getregs(struct kgdb_state *ks)
823{
824 struct task_struct *thread;
825 void *local_debuggerinfo;
826 int i;
827
828 thread = kgdb_usethread;
829 if (!thread) {
830 thread = kgdb_info[ks->cpu].task;
831 local_debuggerinfo = kgdb_info[ks->cpu].debuggerinfo;
832 } else {
833 local_debuggerinfo = NULL;
834 for_each_online_cpu(i) {
835 /*
836 * Try to find the task on some other
837 * or possibly this node if we do not
838 * find the matching task then we try
839 * to approximate the results.
840 */
841 if (thread == kgdb_info[i].task)
842 local_debuggerinfo = kgdb_info[i].debuggerinfo;
843 }
844 }
845
846 /*
847 * All threads that don't have debuggerinfo should be
848 * in schedule() sleeping, since all other CPUs
849 * are in kgdb_wait, and thus have debuggerinfo.
850 */
851 if (local_debuggerinfo) {
852 pt_regs_to_gdb_regs(gdb_regs, local_debuggerinfo);
853 } else {
854 /*
855 * Pull stuff saved during switch_to; nothing
856 * else is accessible (or even particularly
857 * relevant).
858 *
859 * This should be enough for a stack trace.
860 */
861 sleeping_thread_to_gdb_regs(gdb_regs, thread);
862 }
863 kgdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
864}
865
866/* Handle the 'G' set registers request */
867static void gdb_cmd_setregs(struct kgdb_state *ks)
868{
869 kgdb_hex2mem(&remcom_in_buffer[1], (char *)gdb_regs, NUMREGBYTES);
870
871 if (kgdb_usethread && kgdb_usethread != current) {
872 error_packet(remcom_out_buffer, -EINVAL);
873 } else {
874 gdb_regs_to_pt_regs(gdb_regs, ks->linux_regs);
875 strcpy(remcom_out_buffer, "OK");
876 }
877}
878
879/* Handle the 'm' memory read bytes */
880static void gdb_cmd_memread(struct kgdb_state *ks)
881{
882 char *ptr = &remcom_in_buffer[1];
883 unsigned long length;
884 unsigned long addr;
885 int err;
886
887 if (kgdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
888 kgdb_hex2long(&ptr, &length) > 0) {
889 err = kgdb_mem2hex((char *)addr, remcom_out_buffer, length);
890 if (err)
891 error_packet(remcom_out_buffer, err);
892 } else {
893 error_packet(remcom_out_buffer, -EINVAL);
894 }
895}
896
897/* Handle the 'M' memory write bytes */
898static void gdb_cmd_memwrite(struct kgdb_state *ks)
899{
900 int err = write_mem_msg(0);
901
902 if (err)
903 error_packet(remcom_out_buffer, err);
904 else
905 strcpy(remcom_out_buffer, "OK");
906}
907
908/* Handle the 'X' memory binary write bytes */
909static void gdb_cmd_binwrite(struct kgdb_state *ks)
910{
911 int err = write_mem_msg(1);
912
913 if (err)
914 error_packet(remcom_out_buffer, err);
915 else
916 strcpy(remcom_out_buffer, "OK");
917}
918
919/* Handle the 'D' or 'k', detach or kill packets */
920static void gdb_cmd_detachkill(struct kgdb_state *ks)
921{
922 int error;
923
924 /* The detach case */
925 if (remcom_in_buffer[0] == 'D') {
926 error = remove_all_break();
927 if (error < 0) {
928 error_packet(remcom_out_buffer, error);
929 } else {
930 strcpy(remcom_out_buffer, "OK");
931 kgdb_connected = 0;
932 }
933 put_packet(remcom_out_buffer);
934 } else {
935 /*
936 * Assume the kill case, with no exit code checking,
937 * trying to force detach the debugger:
938 */
939 remove_all_break();
940 kgdb_connected = 0;
941 }
942}
943
944/* Handle the 'R' reboot packets */
945static int gdb_cmd_reboot(struct kgdb_state *ks)
946{
947 /* For now, only honor R0 */
948 if (strcmp(remcom_in_buffer, "R0") == 0) {
949 printk(KERN_CRIT "Executing emergency reboot\n");
950 strcpy(remcom_out_buffer, "OK");
951 put_packet(remcom_out_buffer);
952
953 /*
954 * Execution should not return from
955 * machine_emergency_restart()
956 */
957 machine_emergency_restart();
958 kgdb_connected = 0;
959
960 return 1;
961 }
962 return 0;
963}
964
965/* Handle the 'q' query packets */
966static void gdb_cmd_query(struct kgdb_state *ks)
967{
968 struct task_struct *g;
969 struct task_struct *p;
970 unsigned char thref[8];
971 char *ptr;
972 int i;
973 int cpu;
974 int finished = 0;
975
976 switch (remcom_in_buffer[1]) {
977 case 's':
978 case 'f':
979 if (memcmp(remcom_in_buffer + 2, "ThreadInfo", 10)) {
980 error_packet(remcom_out_buffer, -EINVAL);
981 break;
982 }
983
984 i = 0;
985 remcom_out_buffer[0] = 'm';
986 ptr = remcom_out_buffer + 1;
987 if (remcom_in_buffer[1] == 'f') {
988 /* Each cpu is a shadow thread */
989 for_each_online_cpu(cpu) {
990 ks->thr_query = 0;
991 int_to_threadref(thref, -cpu - 2);
992 pack_threadid(ptr, thref);
993 ptr += BUF_THREAD_ID_SIZE;
994 *(ptr++) = ',';
995 i++;
996 }
997 }
998
999 do_each_thread(g, p) {
1000 if (i >= ks->thr_query && !finished) {
1001 int_to_threadref(thref, p->pid);
1002 pack_threadid(ptr, thref);
1003 ptr += BUF_THREAD_ID_SIZE;
1004 *(ptr++) = ',';
1005 ks->thr_query++;
1006 if (ks->thr_query % KGDB_MAX_THREAD_QUERY == 0)
1007 finished = 1;
1008 }
1009 i++;
1010 } while_each_thread(g, p);
1011
1012 *(--ptr) = '\0';
1013 break;
1014
1015 case 'C':
1016 /* Current thread id */
1017 strcpy(remcom_out_buffer, "QC");
1018 ks->threadid = shadow_pid(current->pid);
1019 int_to_threadref(thref, ks->threadid);
1020 pack_threadid(remcom_out_buffer + 2, thref);
1021 break;
1022 case 'T':
1023 if (memcmp(remcom_in_buffer + 1, "ThreadExtraInfo,", 16)) {
1024 error_packet(remcom_out_buffer, -EINVAL);
1025 break;
1026 }
1027 ks->threadid = 0;
1028 ptr = remcom_in_buffer + 17;
1029 kgdb_hex2long(&ptr, &ks->threadid);
1030 if (!getthread(ks->linux_regs, ks->threadid)) {
1031 error_packet(remcom_out_buffer, -EINVAL);
1032 break;
1033 }
1034 if ((int)ks->threadid > 0) {
1035 kgdb_mem2hex(getthread(ks->linux_regs,
1036 ks->threadid)->comm,
1037 remcom_out_buffer, 16);
1038 } else {
1039 static char tmpstr[23 + BUF_THREAD_ID_SIZE];
1040
1041 sprintf(tmpstr, "shadowCPU%d",
1042 (int)(-ks->threadid - 2));
1043 kgdb_mem2hex(tmpstr, remcom_out_buffer, strlen(tmpstr));
1044 }
1045 break;
1046 }
1047}
1048
1049/* Handle the 'H' task query packets */
1050static void gdb_cmd_task(struct kgdb_state *ks)
1051{
1052 struct task_struct *thread;
1053 char *ptr;
1054
1055 switch (remcom_in_buffer[1]) {
1056 case 'g':
1057 ptr = &remcom_in_buffer[2];
1058 kgdb_hex2long(&ptr, &ks->threadid);
1059 thread = getthread(ks->linux_regs, ks->threadid);
1060 if (!thread && ks->threadid > 0) {
1061 error_packet(remcom_out_buffer, -EINVAL);
1062 break;
1063 }
1064 kgdb_usethread = thread;
1065 ks->kgdb_usethreadid = ks->threadid;
1066 strcpy(remcom_out_buffer, "OK");
1067 break;
1068 case 'c':
1069 ptr = &remcom_in_buffer[2];
1070 kgdb_hex2long(&ptr, &ks->threadid);
1071 if (!ks->threadid) {
1072 kgdb_contthread = NULL;
1073 } else {
1074 thread = getthread(ks->linux_regs, ks->threadid);
1075 if (!thread && ks->threadid > 0) {
1076 error_packet(remcom_out_buffer, -EINVAL);
1077 break;
1078 }
1079 kgdb_contthread = thread;
1080 }
1081 strcpy(remcom_out_buffer, "OK");
1082 break;
1083 }
1084}
1085
1086/* Handle the 'T' thread query packets */
1087static void gdb_cmd_thread(struct kgdb_state *ks)
1088{
1089 char *ptr = &remcom_in_buffer[1];
1090 struct task_struct *thread;
1091
1092 kgdb_hex2long(&ptr, &ks->threadid);
1093 thread = getthread(ks->linux_regs, ks->threadid);
1094 if (thread)
1095 strcpy(remcom_out_buffer, "OK");
1096 else
1097 error_packet(remcom_out_buffer, -EINVAL);
1098}
1099
1100/* Handle the 'z' or 'Z' breakpoint remove or set packets */
1101static void gdb_cmd_break(struct kgdb_state *ks)
1102{
1103 /*
1104 * Since GDB-5.3, it's been drafted that '0' is a software
1105 * breakpoint, '1' is a hardware breakpoint, so let's do that.
1106 */
1107 char *bpt_type = &remcom_in_buffer[1];
1108 char *ptr = &remcom_in_buffer[2];
1109 unsigned long addr;
1110 unsigned long length;
1111 int error = 0;
1112
1113 if (arch_kgdb_ops.set_hw_breakpoint && *bpt_type >= '1') {
1114 /* Unsupported */
1115 if (*bpt_type > '4')
1116 return;
1117 } else {
1118 if (*bpt_type != '0' && *bpt_type != '1')
1119 /* Unsupported. */
1120 return;
1121 }
1122
1123 /*
1124 * Test if this is a hardware breakpoint, and
1125 * if we support it:
1126 */
1127 if (*bpt_type == '1' && !(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT))
1128 /* Unsupported. */
1129 return;
1130
1131 if (*(ptr++) != ',') {
1132 error_packet(remcom_out_buffer, -EINVAL);
1133 return;
1134 }
1135 if (!kgdb_hex2long(&ptr, &addr)) {
1136 error_packet(remcom_out_buffer, -EINVAL);
1137 return;
1138 }
1139 if (*(ptr++) != ',' ||
1140 !kgdb_hex2long(&ptr, &length)) {
1141 error_packet(remcom_out_buffer, -EINVAL);
1142 return;
1143 }
1144
1145 if (remcom_in_buffer[0] == 'Z' && *bpt_type == '0')
1146 error = kgdb_set_sw_break(addr);
1147 else if (remcom_in_buffer[0] == 'z' && *bpt_type == '0')
1148 error = kgdb_remove_sw_break(addr);
1149 else if (remcom_in_buffer[0] == 'Z')
1150 error = arch_kgdb_ops.set_hw_breakpoint(addr,
1151 (int)length, *bpt_type - '0');
1152 else if (remcom_in_buffer[0] == 'z')
1153 error = arch_kgdb_ops.remove_hw_breakpoint(addr,
1154 (int) length, *bpt_type - '0');
1155
1156 if (error == 0)
1157 strcpy(remcom_out_buffer, "OK");
1158 else
1159 error_packet(remcom_out_buffer, error);
1160}
1161
1162/* Handle the 'C' signal / exception passing packets */
1163static int gdb_cmd_exception_pass(struct kgdb_state *ks)
1164{
1165 /* C09 == pass exception
1166 * C15 == detach kgdb, pass exception
1167 */
1168 if (remcom_in_buffer[1] == '0' && remcom_in_buffer[2] == '9') {
1169
1170 ks->pass_exception = 1;
1171 remcom_in_buffer[0] = 'c';
1172
1173 } else if (remcom_in_buffer[1] == '1' && remcom_in_buffer[2] == '5') {
1174
1175 ks->pass_exception = 1;
1176 remcom_in_buffer[0] = 'D';
1177 remove_all_break();
1178 kgdb_connected = 0;
1179 return 1;
1180
1181 } else {
1182 kgdb_msg_write("KGDB only knows signal 9 (pass)"
1183 " and 15 (pass and disconnect)\n"
1184 "Executing a continue without signal passing\n", 0);
1185 remcom_in_buffer[0] = 'c';
1186 }
1187
1188 /* Indicate fall through */
1189 return -1;
1190}
1191
1192/*
1193 * This function performs all gdbserial command procesing
1194 */
1195static int gdb_serial_stub(struct kgdb_state *ks)
1196{
1197 int error = 0;
1198 int tmp;
1199
1200 /* Clear the out buffer. */
1201 memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
1202
1203 if (kgdb_connected) {
1204 unsigned char thref[8];
1205 char *ptr;
1206
1207 /* Reply to host that an exception has occurred */
1208 ptr = remcom_out_buffer;
1209 *ptr++ = 'T';
1210 ptr = pack_hex_byte(ptr, ks->signo);
1211 ptr += strlen(strcpy(ptr, "thread:"));
1212 int_to_threadref(thref, shadow_pid(current->pid));
1213 ptr = pack_threadid(ptr, thref);
1214 *ptr++ = ';';
1215 put_packet(remcom_out_buffer);
1216 }
1217
1218 kgdb_usethread = kgdb_info[ks->cpu].task;
1219 ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
1220 ks->pass_exception = 0;
1221
1222 while (1) {
1223 error = 0;
1224
1225 /* Clear the out buffer. */
1226 memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
1227
1228 get_packet(remcom_in_buffer);
1229
1230 switch (remcom_in_buffer[0]) {
1231 case '?': /* gdbserial status */
1232 gdb_cmd_status(ks);
1233 break;
1234 case 'g': /* return the value of the CPU registers */
1235 gdb_cmd_getregs(ks);
1236 break;
1237 case 'G': /* set the value of the CPU registers - return OK */
1238 gdb_cmd_setregs(ks);
1239 break;
1240 case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
1241 gdb_cmd_memread(ks);
1242 break;
1243 case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA..AA */
1244 gdb_cmd_memwrite(ks);
1245 break;
1246 case 'X': /* XAA..AA,LLLL: Write LLLL bytes at address AA..AA */
1247 gdb_cmd_binwrite(ks);
1248 break;
1249 /* kill or detach. KGDB should treat this like a
1250 * continue.
1251 */
1252 case 'D': /* Debugger detach */
1253 case 'k': /* Debugger detach via kill */
1254 gdb_cmd_detachkill(ks);
1255 goto default_handle;
1256 case 'R': /* Reboot */
1257 if (gdb_cmd_reboot(ks))
1258 goto default_handle;
1259 break;
1260 case 'q': /* query command */
1261 gdb_cmd_query(ks);
1262 break;
1263 case 'H': /* task related */
1264 gdb_cmd_task(ks);
1265 break;
1266 case 'T': /* Query thread status */
1267 gdb_cmd_thread(ks);
1268 break;
1269 case 'z': /* Break point remove */
1270 case 'Z': /* Break point set */
1271 gdb_cmd_break(ks);
1272 break;
1273 case 'C': /* Exception passing */
1274 tmp = gdb_cmd_exception_pass(ks);
1275 if (tmp > 0)
1276 goto default_handle;
1277 if (tmp == 0)
1278 break;
1279 /* Fall through on tmp < 0 */
1280 case 'c': /* Continue packet */
1281 case 's': /* Single step packet */
1282 if (kgdb_contthread && kgdb_contthread != current) {
1283 /* Can't switch threads in kgdb */
1284 error_packet(remcom_out_buffer, -EINVAL);
1285 break;
1286 }
1287 kgdb_activate_sw_breakpoints();
1288 /* Fall through to default processing */
1289 default:
1290default_handle:
1291 error = kgdb_arch_handle_exception(ks->ex_vector,
1292 ks->signo,
1293 ks->err_code,
1294 remcom_in_buffer,
1295 remcom_out_buffer,
1296 ks->linux_regs);
1297 /*
1298 * Leave cmd processing on error, detach,
1299 * kill, continue, or single step.
1300 */
1301 if (error >= 0 || remcom_in_buffer[0] == 'D' ||
1302 remcom_in_buffer[0] == 'k') {
1303 error = 0;
1304 goto kgdb_exit;
1305 }
1306
1307 }
1308
1309 /* reply to the request */
1310 put_packet(remcom_out_buffer);
1311 }
1312
1313kgdb_exit:
1314 if (ks->pass_exception)
1315 error = 1;
1316 return error;
1317}
1318
1319static int kgdb_reenter_check(struct kgdb_state *ks)
1320{
1321 unsigned long addr;
1322
1323 if (atomic_read(&kgdb_active) != raw_smp_processor_id())
1324 return 0;
1325
1326 /* Panic on recursive debugger calls: */
1327 exception_level++;
1328 addr = kgdb_arch_pc(ks->ex_vector, ks->linux_regs);
1329 kgdb_deactivate_sw_breakpoints();
1330
1331 /*
1332 * If the break point removed ok at the place exception
1333 * occurred, try to recover and print a warning to the end
1334 * user because the user planted a breakpoint in a place that
1335 * KGDB needs in order to function.
1336 */
1337 if (kgdb_remove_sw_break(addr) == 0) {
1338 exception_level = 0;
1339 kgdb_skipexception(ks->ex_vector, ks->linux_regs);
1340 kgdb_activate_sw_breakpoints();
1341 printk(KERN_CRIT "KGDB: re-enter error: breakpoint removed %lx\n",
1342 addr);
1343 WARN_ON_ONCE(1);
1344
1345 return 1;
1346 }
1347 remove_all_break();
1348 kgdb_skipexception(ks->ex_vector, ks->linux_regs);
1349
1350 if (exception_level > 1) {
1351 dump_stack();
1352 panic("Recursive entry to debugger");
1353 }
1354
1355 printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n");
1356 dump_stack();
1357 panic("Recursive entry to debugger");
1358
1359 return 1;
1360}
1361
1362static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs)
1363{
1364 unsigned long flags;
1365 int sstep_tries = 100;
1366 int error = 0;
1367 int i, cpu;
1368 int trace_on = 0;
1369acquirelock:
1370 /*
1371 * Interrupts will be restored by the 'trap return' code, except when
1372 * single stepping.
1373 */
1374 local_irq_save(flags);
1375
1376 cpu = ks->cpu;
1377 kgdb_info[cpu].debuggerinfo = regs;
1378 kgdb_info[cpu].task = current;
1379 /*
1380 * Make sure the above info reaches the primary CPU before
1381 * our cpu_in_kgdb[] flag setting does:
1382 */
1383 atomic_inc(&cpu_in_kgdb[cpu]);
1384
1385 /*
1386 * CPU will loop if it is a slave or request to become a kgdb
1387 * master cpu and acquire the kgdb_active lock:
1388 */
1389 while (1) {
1390 if (kgdb_info[cpu].exception_state & DCPU_WANT_MASTER) {
1391 if (atomic_cmpxchg(&kgdb_active, -1, cpu) == cpu)
1392 break;
1393 } else if (kgdb_info[cpu].exception_state & DCPU_IS_SLAVE) {
1394 if (!atomic_read(&passive_cpu_wait[cpu]))
1395 goto return_normal;
1396 } else {
1397return_normal:
1398 /* Return to normal operation by executing any
1399 * hw breakpoint fixup.
1400 */
1401 if (arch_kgdb_ops.correct_hw_break)
1402 arch_kgdb_ops.correct_hw_break();
1403 if (trace_on)
1404 tracing_on();
1405 atomic_dec(&cpu_in_kgdb[cpu]);
1406 touch_softlockup_watchdog_sync();
1407 clocksource_touch_watchdog();
1408 local_irq_restore(flags);
1409 return 0;
1410 }
1411 cpu_relax();
1412 }
1413
1414 /*
1415 * For single stepping, try to only enter on the processor
1416 * that was single stepping. To gaurd against a deadlock, the
1417 * kernel will only try for the value of sstep_tries before
1418 * giving up and continuing on.
1419 */
1420 if (atomic_read(&kgdb_cpu_doing_single_step) != -1 &&
1421 (kgdb_info[cpu].task &&
1422 kgdb_info[cpu].task->pid != kgdb_sstep_pid) && --sstep_tries) {
1423 atomic_set(&kgdb_active, -1);
1424 touch_softlockup_watchdog_sync();
1425 clocksource_touch_watchdog();
1426 local_irq_restore(flags);
1427
1428 goto acquirelock;
1429 }
1430
1431 if (!kgdb_io_ready(1)) {
1432 error = 1;
1433 goto kgdb_restore; /* No I/O connection, so resume the system */
1434 }
1435
1436 /*
1437 * Don't enter if we have hit a removed breakpoint.
1438 */
1439 if (kgdb_skipexception(ks->ex_vector, ks->linux_regs))
1440 goto kgdb_restore;
1441
1442 /* Call the I/O driver's pre_exception routine */
1443 if (kgdb_io_ops->pre_exception)
1444 kgdb_io_ops->pre_exception();
1445
1446 kgdb_disable_hw_debug(ks->linux_regs);
1447
1448 /*
1449 * Get the passive CPU lock which will hold all the non-primary
1450 * CPU in a spin state while the debugger is active
1451 */
1452 if (!kgdb_single_step) {
1453 for (i = 0; i < NR_CPUS; i++)
1454 atomic_inc(&passive_cpu_wait[i]);
1455 }
1456
1457#ifdef CONFIG_SMP
1458 /* Signal the other CPUs to enter kgdb_wait() */
1459 if ((!kgdb_single_step) && kgdb_do_roundup)
1460 kgdb_roundup_cpus(flags);
1461#endif
1462
1463 /*
1464 * Wait for the other CPUs to be notified and be waiting for us:
1465 */
1466 for_each_online_cpu(i) {
1467 while (!atomic_read(&cpu_in_kgdb[i]))
1468 cpu_relax();
1469 }
1470
1471 /*
1472 * At this point the primary processor is completely
1473 * in the debugger and all secondary CPUs are quiescent
1474 */
1475 kgdb_post_primary_code(ks->linux_regs, ks->ex_vector, ks->err_code);
1476 kgdb_deactivate_sw_breakpoints();
1477 kgdb_single_step = 0;
1478 kgdb_contthread = current;
1479 exception_level = 0;
1480 trace_on = tracing_is_on();
1481 if (trace_on)
1482 tracing_off();
1483
1484 /* Talk to debugger with gdbserial protocol */
1485 error = gdb_serial_stub(ks);
1486
1487 /* Call the I/O driver's post_exception routine */
1488 if (kgdb_io_ops->post_exception)
1489 kgdb_io_ops->post_exception();
1490
1491 atomic_dec(&cpu_in_kgdb[ks->cpu]);
1492
1493 if (!kgdb_single_step) {
1494 for (i = NR_CPUS-1; i >= 0; i--)
1495 atomic_dec(&passive_cpu_wait[i]);
1496 /*
1497 * Wait till all the CPUs have quit
1498 * from the debugger.
1499 */
1500 for_each_online_cpu(i) {
1501 while (atomic_read(&cpu_in_kgdb[i]))
1502 cpu_relax();
1503 }
1504 }
1505
1506kgdb_restore:
1507 if (atomic_read(&kgdb_cpu_doing_single_step) != -1) {
1508 int sstep_cpu = atomic_read(&kgdb_cpu_doing_single_step);
1509 if (kgdb_info[sstep_cpu].task)
1510 kgdb_sstep_pid = kgdb_info[sstep_cpu].task->pid;
1511 else
1512 kgdb_sstep_pid = 0;
1513 }
1514 if (trace_on)
1515 tracing_on();
1516 /* Free kgdb_active */
1517 atomic_set(&kgdb_active, -1);
1518 touch_softlockup_watchdog_sync();
1519 clocksource_touch_watchdog();
1520 local_irq_restore(flags);
1521
1522 return error;
1523}
1524
1525/*
1526 * kgdb_handle_exception() - main entry point from a kernel exception
1527 *
1528 * Locking hierarchy:
1529 * interface locks, if any (begin_session)
1530 * kgdb lock (kgdb_active)
1531 */
1532int
1533kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
1534{
1535 struct kgdb_state kgdb_var;
1536 struct kgdb_state *ks = &kgdb_var;
1537 int ret;
1538
1539 ks->cpu = raw_smp_processor_id();
1540 ks->ex_vector = evector;
1541 ks->signo = signo;
1542 ks->ex_vector = evector;
1543 ks->err_code = ecode;
1544 ks->kgdb_usethreadid = 0;
1545 ks->linux_regs = regs;
1546
1547 if (kgdb_reenter_check(ks))
1548 return 0; /* Ouch, double exception ! */
1549 kgdb_info[ks->cpu].exception_state |= DCPU_WANT_MASTER;
1550 ret = kgdb_cpu_enter(ks, regs);
1551 kgdb_info[ks->cpu].exception_state &= ~DCPU_WANT_MASTER;
1552 return ret;
1553}
1554
1555int kgdb_nmicallback(int cpu, void *regs)
1556{
1557#ifdef CONFIG_SMP
1558 struct kgdb_state kgdb_var;
1559 struct kgdb_state *ks = &kgdb_var;
1560
1561 memset(ks, 0, sizeof(struct kgdb_state));
1562 ks->cpu = cpu;
1563 ks->linux_regs = regs;
1564
1565 if (!atomic_read(&cpu_in_kgdb[cpu]) &&
1566 atomic_read(&kgdb_active) != -1 &&
1567 atomic_read(&kgdb_active) != cpu) {
1568 kgdb_info[cpu].exception_state |= DCPU_IS_SLAVE;
1569 kgdb_cpu_enter(ks, regs);
1570 kgdb_info[cpu].exception_state &= ~DCPU_IS_SLAVE;
1571 return 0;
1572 }
1573#endif
1574 return 1;
1575}
1576
1577static void kgdb_console_write(struct console *co, const char *s,
1578 unsigned count)
1579{
1580 unsigned long flags;
1581
1582 /* If we're debugging, or KGDB has not connected, don't try
1583 * and print. */
1584 if (!kgdb_connected || atomic_read(&kgdb_active) != -1)
1585 return;
1586
1587 local_irq_save(flags);
1588 kgdb_msg_write(s, count);
1589 local_irq_restore(flags);
1590}
1591
1592static struct console kgdbcons = {
1593 .name = "kgdb",
1594 .write = kgdb_console_write,
1595 .flags = CON_PRINTBUFFER | CON_ENABLED,
1596 .index = -1,
1597};
1598
1599#ifdef CONFIG_MAGIC_SYSRQ
1600static void sysrq_handle_gdb(int key, struct tty_struct *tty)
1601{
1602 if (!kgdb_io_ops) {
1603 printk(KERN_CRIT "ERROR: No KGDB I/O module available\n");
1604 return;
1605 }
1606 if (!kgdb_connected)
1607 printk(KERN_CRIT "Entering KGDB\n");
1608
1609 kgdb_breakpoint();
1610}
1611
1612static struct sysrq_key_op sysrq_gdb_op = {
1613 .handler = sysrq_handle_gdb,
1614 .help_msg = "debug(G)",
1615 .action_msg = "DEBUG",
1616};
1617#endif
1618
1619static void kgdb_register_callbacks(void)
1620{
1621 if (!kgdb_io_module_registered) {
1622 kgdb_io_module_registered = 1;
1623 kgdb_arch_init();
1624#ifdef CONFIG_MAGIC_SYSRQ
1625 register_sysrq_key('g', &sysrq_gdb_op);
1626#endif
1627 if (kgdb_use_con && !kgdb_con_registered) {
1628 register_console(&kgdbcons);
1629 kgdb_con_registered = 1;
1630 }
1631 }
1632}
1633
1634static void kgdb_unregister_callbacks(void)
1635{
1636 /*
1637 * When this routine is called KGDB should unregister from the
1638 * panic handler and clean up, making sure it is not handling any
1639 * break exceptions at the time.
1640 */
1641 if (kgdb_io_module_registered) {
1642 kgdb_io_module_registered = 0;
1643 kgdb_arch_exit();
1644#ifdef CONFIG_MAGIC_SYSRQ
1645 unregister_sysrq_key('g', &sysrq_gdb_op);
1646#endif
1647 if (kgdb_con_registered) {
1648 unregister_console(&kgdbcons);
1649 kgdb_con_registered = 0;
1650 }
1651 }
1652}
1653
1654static void kgdb_initial_breakpoint(void)
1655{
1656 kgdb_break_asap = 0;
1657
1658 printk(KERN_CRIT "kgdb: Waiting for connection from remote gdb...\n");
1659 kgdb_breakpoint();
1660}
1661
1662/**
1663 * kgdb_register_io_module - register KGDB IO module
1664 * @new_kgdb_io_ops: the io ops vector
1665 *
1666 * Register it with the KGDB core.
1667 */
1668int kgdb_register_io_module(struct kgdb_io *new_kgdb_io_ops)
1669{
1670 int err;
1671
1672 spin_lock(&kgdb_registration_lock);
1673
1674 if (kgdb_io_ops) {
1675 spin_unlock(&kgdb_registration_lock);
1676
1677 printk(KERN_ERR "kgdb: Another I/O driver is already "
1678 "registered with KGDB.\n");
1679 return -EBUSY;
1680 }
1681
1682 if (new_kgdb_io_ops->init) {
1683 err = new_kgdb_io_ops->init();
1684 if (err) {
1685 spin_unlock(&kgdb_registration_lock);
1686 return err;
1687 }
1688 }
1689
1690 kgdb_io_ops = new_kgdb_io_ops;
1691
1692 spin_unlock(&kgdb_registration_lock);
1693
1694 printk(KERN_INFO "kgdb: Registered I/O driver %s.\n",
1695 new_kgdb_io_ops->name);
1696
1697 /* Arm KGDB now. */
1698 kgdb_register_callbacks();
1699
1700 if (kgdb_break_asap)
1701 kgdb_initial_breakpoint();
1702
1703 return 0;
1704}
1705EXPORT_SYMBOL_GPL(kgdb_register_io_module);
1706
1707/**
1708 * kkgdb_unregister_io_module - unregister KGDB IO module
1709 * @old_kgdb_io_ops: the io ops vector
1710 *
1711 * Unregister it with the KGDB core.
1712 */
1713void kgdb_unregister_io_module(struct kgdb_io *old_kgdb_io_ops)
1714{
1715 BUG_ON(kgdb_connected);
1716
1717 /*
1718 * KGDB is no longer able to communicate out, so
1719 * unregister our callbacks and reset state.
1720 */
1721 kgdb_unregister_callbacks();
1722
1723 spin_lock(&kgdb_registration_lock);
1724
1725 WARN_ON_ONCE(kgdb_io_ops != old_kgdb_io_ops);
1726 kgdb_io_ops = NULL;
1727
1728 spin_unlock(&kgdb_registration_lock);
1729
1730 printk(KERN_INFO
1731 "kgdb: Unregistered I/O driver %s, debugger disabled.\n",
1732 old_kgdb_io_ops->name);
1733}
1734EXPORT_SYMBOL_GPL(kgdb_unregister_io_module);
1735
1736/**
1737 * kgdb_breakpoint - generate breakpoint exception
1738 *
1739 * This function will generate a breakpoint exception. It is used at the
1740 * beginning of a program to sync up with a debugger and can be used
1741 * otherwise as a quick means to stop program execution and "break" into
1742 * the debugger.
1743 */
1744void kgdb_breakpoint(void)
1745{
1746 atomic_inc(&kgdb_setting_breakpoint);
1747 wmb(); /* Sync point before breakpoint */
1748 arch_kgdb_breakpoint();
1749 wmb(); /* Sync point after breakpoint */
1750 atomic_dec(&kgdb_setting_breakpoint);
1751}
1752EXPORT_SYMBOL_GPL(kgdb_breakpoint);
1753
1754static int __init opt_kgdb_wait(char *str)
1755{
1756 kgdb_break_asap = 1;
1757
1758 if (kgdb_io_module_registered)
1759 kgdb_initial_breakpoint();
1760
1761 return 0;
1762}
1763
1764early_param("kgdbwait", opt_kgdb_wait);
diff --git a/kernel/module.c b/kernel/module.c
index 5e14483768bb..3c4fc4bb4b82 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -77,6 +77,10 @@
77DEFINE_MUTEX(module_mutex); 77DEFINE_MUTEX(module_mutex);
78EXPORT_SYMBOL_GPL(module_mutex); 78EXPORT_SYMBOL_GPL(module_mutex);
79static LIST_HEAD(modules); 79static LIST_HEAD(modules);
80#ifdef CONFIG_KGDB_KDB
81struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
82#endif /* CONFIG_KGDB_KDB */
83
80 84
81/* Block module loading/unloading? */ 85/* Block module loading/unloading? */
82int modules_disabled = 0; 86int modules_disabled = 0;
diff --git a/kernel/printk.c b/kernel/printk.c
index 75077ad0b537..444b770c9595 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -33,6 +33,7 @@
33#include <linux/bootmem.h> 33#include <linux/bootmem.h>
34#include <linux/syscalls.h> 34#include <linux/syscalls.h>
35#include <linux/kexec.h> 35#include <linux/kexec.h>
36#include <linux/kdb.h>
36#include <linux/ratelimit.h> 37#include <linux/ratelimit.h>
37#include <linux/kmsg_dump.h> 38#include <linux/kmsg_dump.h>
38#include <linux/syslog.h> 39#include <linux/syslog.h>
@@ -413,6 +414,22 @@ SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
413 return do_syslog(type, buf, len, SYSLOG_FROM_CALL); 414 return do_syslog(type, buf, len, SYSLOG_FROM_CALL);
414} 415}
415 416
417#ifdef CONFIG_KGDB_KDB
418/* kdb dmesg command needs access to the syslog buffer. do_syslog()
419 * uses locks so it cannot be used during debugging. Just tell kdb
420 * where the start and end of the physical and logical logs are. This
421 * is equivalent to do_syslog(3).
422 */
423void kdb_syslog_data(char *syslog_data[4])
424{
425 syslog_data[0] = log_buf;
426 syslog_data[1] = log_buf + log_buf_len;
427 syslog_data[2] = log_buf + log_end -
428 (logged_chars < log_buf_len ? logged_chars : log_buf_len);
429 syslog_data[3] = log_buf + log_end;
430}
431#endif /* CONFIG_KGDB_KDB */
432
416/* 433/*
417 * Call the console drivers on a range of log_buf 434 * Call the console drivers on a range of log_buf
418 */ 435 */
@@ -586,6 +603,14 @@ asmlinkage int printk(const char *fmt, ...)
586 va_list args; 603 va_list args;
587 int r; 604 int r;
588 605
606#ifdef CONFIG_KGDB_KDB
607 if (unlikely(kdb_trap_printk)) {
608 va_start(args, fmt);
609 r = vkdb_printf(fmt, args);
610 va_end(args);
611 return r;
612 }
613#endif
589 va_start(args, fmt); 614 va_start(args, fmt);
590 r = vprintk(fmt, args); 615 r = vprintk(fmt, args);
591 va_end(args); 616 va_end(args);
diff --git a/kernel/sched.c b/kernel/sched.c
index d9c0368eeb21..054a6012de99 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7759,9 +7759,9 @@ void normalize_rt_tasks(void)
7759 7759
7760#endif /* CONFIG_MAGIC_SYSRQ */ 7760#endif /* CONFIG_MAGIC_SYSRQ */
7761 7761
7762#ifdef CONFIG_IA64 7762#if defined(CONFIG_IA64) || defined(CONFIG_KGDB_KDB)
7763/* 7763/*
7764 * These functions are only useful for the IA64 MCA handling. 7764 * These functions are only useful for the IA64 MCA handling, or kdb.
7765 * 7765 *
7766 * They can only be called when the whole system has been 7766 * They can only be called when the whole system has been
7767 * stopped - every CPU needs to be quiescent, and no scheduling 7767 * stopped - every CPU needs to be quiescent, and no scheduling
@@ -7781,6 +7781,9 @@ struct task_struct *curr_task(int cpu)
7781 return cpu_curr(cpu); 7781 return cpu_curr(cpu);
7782} 7782}
7783 7783
7784#endif /* defined(CONFIG_IA64) || defined(CONFIG_KGDB_KDB) */
7785
7786#ifdef CONFIG_IA64
7784/** 7787/**
7785 * set_curr_task - set the current task for a given cpu. 7788 * set_curr_task - set the current task for a given cpu.
7786 * @cpu: the processor in question. 7789 * @cpu: the processor in question.
diff --git a/kernel/signal.c b/kernel/signal.c
index dbd7fe073c55..825a3f24ad76 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2735,3 +2735,43 @@ void __init signals_init(void)
2735{ 2735{
2736 sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC); 2736 sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);
2737} 2737}
2738
2739#ifdef CONFIG_KGDB_KDB
2740#include <linux/kdb.h>
2741/*
2742 * kdb_send_sig_info - Allows kdb to send signals without exposing
2743 * signal internals. This function checks if the required locks are
2744 * available before calling the main signal code, to avoid kdb
2745 * deadlocks.
2746 */
2747void
2748kdb_send_sig_info(struct task_struct *t, struct siginfo *info)
2749{
2750 static struct task_struct *kdb_prev_t;
2751 int sig, new_t;
2752 if (!spin_trylock(&t->sighand->siglock)) {
2753 kdb_printf("Can't do kill command now.\n"
2754 "The sigmask lock is held somewhere else in "
2755 "kernel, try again later\n");
2756 return;
2757 }
2758 spin_unlock(&t->sighand->siglock);
2759 new_t = kdb_prev_t != t;
2760 kdb_prev_t = t;
2761 if (t->state != TASK_RUNNING && new_t) {
2762 kdb_printf("Process is not RUNNING, sending a signal from "
2763 "kdb risks deadlock\n"
2764 "on the run queue locks. "
2765 "The signal has _not_ been sent.\n"
2766 "Reissue the kill command if you want to risk "
2767 "the deadlock.\n");
2768 return;
2769 }
2770 sig = info->si_signo;
2771 if (send_sig_info(sig, info, t))
2772 kdb_printf("Fail to deliver Signal %d to process %d.\n",
2773 sig, t->pid);
2774 else
2775 kdb_printf("Signal %d is sent to process %d.\n", sig, t->pid);
2776}
2777#endif /* CONFIG_KGDB_KDB */
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index 9b5d1d7f2ef7..43cb93fa2651 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -3,7 +3,7 @@ config HAVE_ARCH_KGDB
3 bool 3 bool
4 4
5menuconfig KGDB 5menuconfig KGDB
6 bool "KGDB: kernel debugging with remote gdb" 6 bool "KGDB: kernel debugger"
7 depends on HAVE_ARCH_KGDB 7 depends on HAVE_ARCH_KGDB
8 depends on DEBUG_KERNEL && EXPERIMENTAL 8 depends on DEBUG_KERNEL && EXPERIMENTAL
9 help 9 help
@@ -57,4 +57,26 @@ config KGDB_TESTS_BOOT_STRING
57 information about other strings you could use beyond the 57 information about other strings you could use beyond the
58 default of V1F100. 58 default of V1F100.
59 59
60config KGDB_LOW_LEVEL_TRAP
61 bool "KGDB: Allow debugging with traps in notifiers"
62 depends on X86 || MIPS
63 default n
64 help
65 This will add an extra call back to kgdb for the breakpoint
66 exception handler on which will will allow kgdb to step
67 through a notify handler.
68
69config KGDB_KDB
70 bool "KGDB_KDB: include kdb frontend for kgdb"
71 default n
72 help
73 KDB frontend for kernel
74
75config KDB_KEYBOARD
76 bool "KGDB_KDB: keyboard as input device"
77 depends on VT && KGDB_KDB
78 default n
79 help
80 KDB can use a PS/2 type keyboard for an input device
81
60endif # KGDB 82endif # KGDB
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-25 12:29:21 -0500