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-rw-r--r--Documentation/DocBook/kgdb.tmpl13
-rw-r--r--arch/arm/include/asm/kgdb.h5
-rw-r--r--arch/arm/kernel/kgdb.c2
-rw-r--r--arch/blackfin/kernel/kgdb.c3
-rw-r--r--arch/powerpc/include/asm/kgdb.h1
-rw-r--r--arch/powerpc/kernel/kgdb.c188
-rw-r--r--arch/x86/kernel/kgdb.c3
-rw-r--r--drivers/misc/kgdbts.c16
-rw-r--r--include/linux/kgdb.h13
-rw-r--r--kernel/debug/debug_core.c16
-rw-r--r--kernel/debug/kdb/kdb_main.c48
-rw-r--r--samples/Kconfig7
-rw-r--r--samples/Makefile2
-rw-r--r--samples/kdb/Makefile1
-rw-r--r--samples/kdb/kdb_hello.c60
15 files changed, 235 insertions, 143 deletions
diff --git a/Documentation/DocBook/kgdb.tmpl b/Documentation/DocBook/kgdb.tmpl
index 490d862c5f0d..d71b57fcf116 100644
--- a/Documentation/DocBook/kgdb.tmpl
+++ b/Documentation/DocBook/kgdb.tmpl
@@ -710,7 +710,18 @@ Task Addr Pid Parent [*] cpu State Thread Command
710 <listitem><para>A simple shell</para></listitem> 710 <listitem><para>A simple shell</para></listitem>
711 <listitem><para>The kdb core command set</para></listitem> 711 <listitem><para>The kdb core command set</para></listitem>
712 <listitem><para>A registration API to register additional kdb shell commands.</para> 712 <listitem><para>A registration API to register additional kdb shell commands.</para>
713 <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> 713 <itemizedlist>
714 <listitem><para>A good example of a self-contained kdb module
715 is the "ftdump" command for dumping the ftrace buffer. See:
716 kernel/trace/trace_kdb.c</para></listitem>
717 <listitem><para>For an example of how to dynamically register
718 a new kdb command you can build the kdb_hello.ko kernel module
719 from samples/kdb/kdb_hello.c. To build this example you can
720 set CONFIG_SAMPLES=y and CONFIG_SAMPLE_KDB=m in your kernel
721 config. Later run "modprobe kdb_hello" and the next time you
722 enter the kdb shell, you can run the "hello"
723 command.</para></listitem>
724 </itemizedlist></listitem>
714 <listitem><para>The implementation for kdb_printf() which 725 <listitem><para>The implementation for kdb_printf() which
715 emits messages directly to I/O drivers, bypassing the kernel 726 emits messages directly to I/O drivers, bypassing the kernel
716 log.</para></listitem> 727 log.</para></listitem>
diff --git a/arch/arm/include/asm/kgdb.h b/arch/arm/include/asm/kgdb.h
index 08265993227f..48066ce9ea34 100644
--- a/arch/arm/include/asm/kgdb.h
+++ b/arch/arm/include/asm/kgdb.h
@@ -70,7 +70,8 @@ extern int kgdb_fault_expected;
70#define _GP_REGS 16 70#define _GP_REGS 16
71#define _FP_REGS 8 71#define _FP_REGS 8
72#define _EXTRA_REGS 2 72#define _EXTRA_REGS 2
73#define DBG_MAX_REG_NUM (_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS) 73#define GDB_MAX_REGS (_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS)
74#define DBG_MAX_REG_NUM (_GP_REGS + _FP_REGS + _EXTRA_REGS)
74 75
75#define KGDB_MAX_NO_CPUS 1 76#define KGDB_MAX_NO_CPUS 1
76#define BUFMAX 400 77#define BUFMAX 400
@@ -93,7 +94,7 @@ extern int kgdb_fault_expected;
93#define _SPT 13 94#define _SPT 13
94#define _LR 14 95#define _LR 14
95#define _PC 15 96#define _PC 15
96#define _CPSR (DBG_MAX_REG_NUM - 1) 97#define _CPSR (GDB_MAX_REGS - 1)
97 98
98/* 99/*
99 * So that we can denote the end of a frame for tracing, 100 * So that we can denote the end of a frame for tracing,
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c
index d6e8b4d2e60d..778c2f7024ff 100644
--- a/arch/arm/kernel/kgdb.c
+++ b/arch/arm/kernel/kgdb.c
@@ -79,7 +79,7 @@ sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
79 return; 79 return;
80 80
81 /* Initialize to zero */ 81 /* Initialize to zero */
82 for (regno = 0; regno < DBG_MAX_REG_NUM; regno++) 82 for (regno = 0; regno < GDB_MAX_REGS; regno++)
83 gdb_regs[regno] = 0; 83 gdb_regs[regno] = 0;
84 84
85 /* Otherwise, we have only some registers from switch_to() */ 85 /* Otherwise, we have only some registers from switch_to() */
diff --git a/arch/blackfin/kernel/kgdb.c b/arch/blackfin/kernel/kgdb.c
index 08bc44ea6883..edae461b1c54 100644
--- a/arch/blackfin/kernel/kgdb.c
+++ b/arch/blackfin/kernel/kgdb.c
@@ -320,7 +320,7 @@ static void bfin_correct_hw_break(void)
320 } 320 }
321} 321}
322 322
323void kgdb_disable_hw_debug(struct pt_regs *regs) 323static void bfin_disable_hw_debug(struct pt_regs *regs)
324{ 324{
325 /* Disable hardware debugging while we are in kgdb */ 325 /* Disable hardware debugging while we are in kgdb */
326 bfin_write_WPIACTL(0); 326 bfin_write_WPIACTL(0);
@@ -406,6 +406,7 @@ struct kgdb_arch arch_kgdb_ops = {
406#endif 406#endif
407 .set_hw_breakpoint = bfin_set_hw_break, 407 .set_hw_breakpoint = bfin_set_hw_break,
408 .remove_hw_breakpoint = bfin_remove_hw_break, 408 .remove_hw_breakpoint = bfin_remove_hw_break,
409 .disable_hw_break = bfin_disable_hw_debug,
409 .remove_all_hw_break = bfin_remove_all_hw_break, 410 .remove_all_hw_break = bfin_remove_all_hw_break,
410 .correct_hw_break = bfin_correct_hw_break, 411 .correct_hw_break = bfin_correct_hw_break,
411}; 412};
diff --git a/arch/powerpc/include/asm/kgdb.h b/arch/powerpc/include/asm/kgdb.h
index edd217006d27..9db24e77b9f4 100644
--- a/arch/powerpc/include/asm/kgdb.h
+++ b/arch/powerpc/include/asm/kgdb.h
@@ -31,6 +31,7 @@ static inline void arch_kgdb_breakpoint(void)
31 asm(".long 0x7d821008"); /* twge r2, r2 */ 31 asm(".long 0x7d821008"); /* twge r2, r2 */
32} 32}
33#define CACHE_FLUSH_IS_SAFE 1 33#define CACHE_FLUSH_IS_SAFE 1
34#define DBG_MAX_REG_NUM 70
34 35
35/* The number bytes of registers we have to save depends on a few 36/* The number bytes of registers we have to save depends on a few
36 * things. For 64bit we default to not including vector registers and 37 * things. For 64bit we default to not including vector registers and
diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index 7f61a3ac787c..7a9db64f3f04 100644
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c
@@ -194,40 +194,6 @@ static int kgdb_dabr_match(struct pt_regs *regs)
194 ptr = (unsigned long *)ptr32; \ 194 ptr = (unsigned long *)ptr32; \
195 } while (0) 195 } while (0)
196 196
197
198void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
199{
200 unsigned long *ptr = gdb_regs;
201 int reg;
202
203 memset(gdb_regs, 0, NUMREGBYTES);
204
205 for (reg = 0; reg < 32; reg++)
206 PACK64(ptr, regs->gpr[reg]);
207
208#ifdef CONFIG_FSL_BOOKE
209#ifdef CONFIG_SPE
210 for (reg = 0; reg < 32; reg++)
211 PACK64(ptr, current->thread.evr[reg]);
212#else
213 ptr += 32;
214#endif
215#else
216 /* fp registers not used by kernel, leave zero */
217 ptr += 32 * 8 / sizeof(long);
218#endif
219
220 PACK64(ptr, regs->nip);
221 PACK64(ptr, regs->msr);
222 PACK32(ptr, regs->ccr);
223 PACK64(ptr, regs->link);
224 PACK64(ptr, regs->ctr);
225 PACK32(ptr, regs->xer);
226
227 BUG_ON((unsigned long)ptr >
228 (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
229}
230
231void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) 197void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
232{ 198{
233 struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp + 199 struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp +
@@ -271,44 +237,140 @@ void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
271 (unsigned long)(((void *)gdb_regs) + NUMREGBYTES)); 237 (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
272} 238}
273 239
274#define UNPACK64(dest, ptr) do { dest = *(ptr++); } while (0) 240#define GDB_SIZEOF_REG sizeof(unsigned long)
241#define GDB_SIZEOF_REG_U32 sizeof(u32)
275 242
276#define UNPACK32(dest, ptr) do { \ 243#ifdef CONFIG_FSL_BOOKE
277 u32 *ptr32; \ 244#define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long)
278 ptr32 = (u32 *)ptr; \ 245#else
279 dest = *(ptr32++); \ 246#define GDB_SIZEOF_FLOAT_REG sizeof(u64)
280 ptr = (unsigned long *)ptr32; \ 247#endif
281 } while (0)
282 248
283void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs) 249struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
284{ 250{
285 unsigned long *ptr = gdb_regs; 251 { "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) },
286 int reg; 252 { "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) },
287 253 { "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) },
288 for (reg = 0; reg < 32; reg++) 254 { "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) },
289 UNPACK64(regs->gpr[reg], ptr); 255 { "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) },
256 { "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) },
257 { "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) },
258 { "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) },
259 { "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) },
260 { "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) },
261 { "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) },
262 { "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) },
263 { "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) },
264 { "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) },
265 { "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) },
266 { "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) },
267 { "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) },
268 { "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) },
269 { "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) },
270 { "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) },
271 { "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) },
272 { "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) },
273 { "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) },
274 { "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) },
275 { "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) },
276 { "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) },
277 { "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) },
278 { "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) },
279 { "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) },
280 { "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) },
281 { "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) },
282 { "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) },
283
284 { "f0", GDB_SIZEOF_FLOAT_REG, 0 },
285 { "f1", GDB_SIZEOF_FLOAT_REG, 1 },
286 { "f2", GDB_SIZEOF_FLOAT_REG, 2 },
287 { "f3", GDB_SIZEOF_FLOAT_REG, 3 },
288 { "f4", GDB_SIZEOF_FLOAT_REG, 4 },
289 { "f5", GDB_SIZEOF_FLOAT_REG, 5 },
290 { "f6", GDB_SIZEOF_FLOAT_REG, 6 },
291 { "f7", GDB_SIZEOF_FLOAT_REG, 7 },
292 { "f8", GDB_SIZEOF_FLOAT_REG, 8 },
293 { "f9", GDB_SIZEOF_FLOAT_REG, 9 },
294 { "f10", GDB_SIZEOF_FLOAT_REG, 10 },
295 { "f11", GDB_SIZEOF_FLOAT_REG, 11 },
296 { "f12", GDB_SIZEOF_FLOAT_REG, 12 },
297 { "f13", GDB_SIZEOF_FLOAT_REG, 13 },
298 { "f14", GDB_SIZEOF_FLOAT_REG, 14 },
299 { "f15", GDB_SIZEOF_FLOAT_REG, 15 },
300 { "f16", GDB_SIZEOF_FLOAT_REG, 16 },
301 { "f17", GDB_SIZEOF_FLOAT_REG, 17 },
302 { "f18", GDB_SIZEOF_FLOAT_REG, 18 },
303 { "f19", GDB_SIZEOF_FLOAT_REG, 19 },
304 { "f20", GDB_SIZEOF_FLOAT_REG, 20 },
305 { "f21", GDB_SIZEOF_FLOAT_REG, 21 },
306 { "f22", GDB_SIZEOF_FLOAT_REG, 22 },
307 { "f23", GDB_SIZEOF_FLOAT_REG, 23 },
308 { "f24", GDB_SIZEOF_FLOAT_REG, 24 },
309 { "f25", GDB_SIZEOF_FLOAT_REG, 25 },
310 { "f26", GDB_SIZEOF_FLOAT_REG, 26 },
311 { "f27", GDB_SIZEOF_FLOAT_REG, 27 },
312 { "f28", GDB_SIZEOF_FLOAT_REG, 28 },
313 { "f29", GDB_SIZEOF_FLOAT_REG, 29 },
314 { "f30", GDB_SIZEOF_FLOAT_REG, 30 },
315 { "f31", GDB_SIZEOF_FLOAT_REG, 31 },
316
317 { "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) },
318 { "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) },
319 { "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) },
320 { "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) },
321 { "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) },
322 { "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) },
323};
290 324
291#ifdef CONFIG_FSL_BOOKE 325char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
292#ifdef CONFIG_SPE 326{
293 for (reg = 0; reg < 32; reg++) 327 if (regno >= DBG_MAX_REG_NUM || regno < 0)
294 UNPACK64(current->thread.evr[reg], ptr); 328 return NULL;
329
330 if (regno < 32 || regno >= 64)
331 /* First 0 -> 31 gpr registers*/
332 /* pc, msr, ls... registers 64 -> 69 */
333 memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
334 dbg_reg_def[regno].size);
335
336 if (regno >= 32 && regno < 64) {
337 /* FP registers 32 -> 63 */
338#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
339 if (current)
340 memcpy(mem, current->thread.evr[regno-32],
341 dbg_reg_def[regno].size);
295#else 342#else
296 ptr += 32; 343 /* fp registers not used by kernel, leave zero */
344 memset(mem, 0, dbg_reg_def[regno].size);
297#endif 345#endif
346 }
347
348 return dbg_reg_def[regno].name;
349}
350
351int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
352{
353 if (regno >= DBG_MAX_REG_NUM || regno < 0)
354 return -EINVAL;
355
356 if (regno < 32 || regno >= 64)
357 /* First 0 -> 31 gpr registers*/
358 /* pc, msr, ls... registers 64 -> 69 */
359 memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
360 dbg_reg_def[regno].size);
361
362 if (regno >= 32 && regno < 64) {
363 /* FP registers 32 -> 63 */
364#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
365 memcpy(current->thread.evr[regno-32], mem,
366 dbg_reg_def[regno].size);
298#else 367#else
299 /* fp registers not used by kernel, leave zero */ 368 /* fp registers not used by kernel, leave zero */
300 ptr += 32 * 8 / sizeof(int); 369 return 0;
301#endif 370#endif
371 }
302 372
303 UNPACK64(regs->nip, ptr); 373 return 0;
304 UNPACK64(regs->msr, ptr);
305 UNPACK32(regs->ccr, ptr);
306 UNPACK64(regs->link, ptr);
307 UNPACK64(regs->ctr, ptr);
308 UNPACK32(regs->xer, ptr);
309
310 BUG_ON((unsigned long)ptr >
311 (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
312} 374}
313 375
314void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) 376void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index d81cfebb848f..ec592caac4b4 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -387,7 +387,7 @@ kgdb_set_hw_break(unsigned long addr, int len, enum kgdb_bptype bptype)
387 * disable hardware debugging while it is processing gdb packets or 387 * disable hardware debugging while it is processing gdb packets or
388 * handling exception. 388 * handling exception.
389 */ 389 */
390void kgdb_disable_hw_debug(struct pt_regs *regs) 390static void kgdb_disable_hw_debug(struct pt_regs *regs)
391{ 391{
392 int i; 392 int i;
393 int cpu = raw_smp_processor_id(); 393 int cpu = raw_smp_processor_id();
@@ -724,6 +724,7 @@ struct kgdb_arch arch_kgdb_ops = {
724 .flags = KGDB_HW_BREAKPOINT, 724 .flags = KGDB_HW_BREAKPOINT,
725 .set_hw_breakpoint = kgdb_set_hw_break, 725 .set_hw_breakpoint = kgdb_set_hw_break,
726 .remove_hw_breakpoint = kgdb_remove_hw_break, 726 .remove_hw_breakpoint = kgdb_remove_hw_break,
727 .disable_hw_break = kgdb_disable_hw_debug,
727 .remove_all_hw_break = kgdb_remove_all_hw_break, 728 .remove_all_hw_break = kgdb_remove_all_hw_break,
728 .correct_hw_break = kgdb_correct_hw_break, 729 .correct_hw_break = kgdb_correct_hw_break,
729}; 730};
diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c
index 72450237a0f4..59c118c19a91 100644
--- a/drivers/misc/kgdbts.c
+++ b/drivers/misc/kgdbts.c
@@ -1044,12 +1044,6 @@ static int __init init_kgdbts(void)
1044 return configure_kgdbts(); 1044 return configure_kgdbts();
1045} 1045}
1046 1046
1047static void cleanup_kgdbts(void)
1048{
1049 if (configured == 1)
1050 kgdb_unregister_io_module(&kgdbts_io_ops);
1051}
1052
1053static int kgdbts_get_char(void) 1047static int kgdbts_get_char(void)
1054{ 1048{
1055 int val = 0; 1049 int val = 0;
@@ -1081,10 +1075,8 @@ static int param_set_kgdbts_var(const char *kmessage, struct kernel_param *kp)
1081 return 0; 1075 return 0;
1082 } 1076 }
1083 1077
1084 if (kgdb_connected) { 1078 if (configured == 1) {
1085 printk(KERN_ERR 1079 printk(KERN_ERR "kgdbts: ERROR: Already configured and running.\n");
1086 "kgdbts: Cannot reconfigure while KGDB is connected.\n");
1087
1088 return -EBUSY; 1080 return -EBUSY;
1089 } 1081 }
1090 1082
@@ -1093,9 +1085,6 @@ static int param_set_kgdbts_var(const char *kmessage, struct kernel_param *kp)
1093 if (config[len - 1] == '\n') 1085 if (config[len - 1] == '\n')
1094 config[len - 1] = '\0'; 1086 config[len - 1] = '\0';
1095 1087
1096 if (configured == 1)
1097 cleanup_kgdbts();
1098
1099 /* Go and configure with the new params. */ 1088 /* Go and configure with the new params. */
1100 return configure_kgdbts(); 1089 return configure_kgdbts();
1101} 1090}
@@ -1123,7 +1112,6 @@ static struct kgdb_io kgdbts_io_ops = {
1123}; 1112};
1124 1113
1125module_init(init_kgdbts); 1114module_init(init_kgdbts);
1126module_exit(cleanup_kgdbts);
1127module_param_call(kgdbts, param_set_kgdbts_var, param_get_string, &kps, 0644); 1115module_param_call(kgdbts, param_set_kgdbts_var, param_get_string, &kps, 0644);
1128MODULE_PARM_DESC(kgdbts, "<A|V1|V2>[F#|S#][N#]"); 1116MODULE_PARM_DESC(kgdbts, "<A|V1|V2>[F#|S#][N#]");
1129MODULE_DESCRIPTION("KGDB Test Suite"); 1117MODULE_DESCRIPTION("KGDB Test Suite");
diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h
index cc96f0f23e04..092e4250a458 100644
--- a/include/linux/kgdb.h
+++ b/include/linux/kgdb.h
@@ -35,16 +35,6 @@ struct pt_regs;
35 */ 35 */
36extern int kgdb_skipexception(int exception, struct pt_regs *regs); 36extern int kgdb_skipexception(int exception, struct pt_regs *regs);
37 37
38/**
39 * kgdb_disable_hw_debug - (optional) Disable hardware debugging hook
40 * @regs: Current &struct pt_regs.
41 *
42 * This function will be called if the particular architecture must
43 * disable hardware debugging while it is processing gdb packets or
44 * handling exception.
45 */
46extern void kgdb_disable_hw_debug(struct pt_regs *regs);
47
48struct tasklet_struct; 38struct tasklet_struct;
49struct task_struct; 39struct task_struct;
50struct uart_port; 40struct uart_port;
@@ -243,6 +233,8 @@ extern void kgdb_arch_late(void);
243 * breakpoint. 233 * breakpoint.
244 * @remove_hw_breakpoint: Allow an architecture to specify how to remove a 234 * @remove_hw_breakpoint: Allow an architecture to specify how to remove a
245 * hardware breakpoint. 235 * hardware breakpoint.
236 * @disable_hw_break: Allow an architecture to specify how to disable
237 * hardware breakpoints for a single cpu.
246 * @remove_all_hw_break: Allow an architecture to specify how to remove all 238 * @remove_all_hw_break: Allow an architecture to specify how to remove all
247 * hardware breakpoints. 239 * hardware breakpoints.
248 * @correct_hw_break: Allow an architecture to specify how to correct the 240 * @correct_hw_break: Allow an architecture to specify how to correct the
@@ -256,6 +248,7 @@ struct kgdb_arch {
256 int (*remove_breakpoint)(unsigned long, char *); 248 int (*remove_breakpoint)(unsigned long, char *);
257 int (*set_hw_breakpoint)(unsigned long, int, enum kgdb_bptype); 249 int (*set_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);
258 int (*remove_hw_breakpoint)(unsigned long, int, enum kgdb_bptype); 250 int (*remove_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);
251 void (*disable_hw_break)(struct pt_regs *regs);
259 void (*remove_all_hw_break)(void); 252 void (*remove_all_hw_break)(void);
260 void (*correct_hw_break)(void); 253 void (*correct_hw_break)(void);
261}; 254};
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index fec596da9bd0..cefd4a11f6d9 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -209,18 +209,6 @@ int __weak kgdb_skipexception(int exception, struct pt_regs *regs)
209 return 0; 209 return 0;
210} 210}
211 211
212/**
213 * kgdb_disable_hw_debug - Disable hardware debugging while we in kgdb.
214 * @regs: Current &struct pt_regs.
215 *
216 * This function will be called if the particular architecture must
217 * disable hardware debugging while it is processing gdb packets or
218 * handling exception.
219 */
220void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
221{
222}
223
224/* 212/*
225 * Some architectures need cache flushes when we set/clear a 213 * Some architectures need cache flushes when we set/clear a
226 * breakpoint: 214 * breakpoint:
@@ -484,7 +472,9 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs,
484 atomic_inc(&masters_in_kgdb); 472 atomic_inc(&masters_in_kgdb);
485 else 473 else
486 atomic_inc(&slaves_in_kgdb); 474 atomic_inc(&slaves_in_kgdb);
487 kgdb_disable_hw_debug(ks->linux_regs); 475
476 if (arch_kgdb_ops.disable_hw_break)
477 arch_kgdb_ops.disable_hw_break(regs);
488 478
489acquirelock: 479acquirelock:
490 /* 480 /*
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index d7bda21a106b..37755d621924 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -1127,7 +1127,7 @@ static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1127 /* special case below */ 1127 /* special case below */
1128 } else { 1128 } else {
1129 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ", 1129 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1130 kdb_current, kdb_current->pid); 1130 kdb_current, kdb_current ? kdb_current->pid : 0);
1131#if defined(CONFIG_SMP) 1131#if defined(CONFIG_SMP)
1132 kdb_printf("on processor %d ", raw_smp_processor_id()); 1132 kdb_printf("on processor %d ", raw_smp_processor_id());
1133#endif 1133#endif
@@ -2603,20 +2603,17 @@ static int kdb_summary(int argc, const char **argv)
2603 */ 2603 */
2604static int kdb_per_cpu(int argc, const char **argv) 2604static int kdb_per_cpu(int argc, const char **argv)
2605{ 2605{
2606 char buf[256], fmtstr[64]; 2606 char fmtstr[64];
2607 kdb_symtab_t symtab; 2607 int cpu, diag, nextarg = 1;
2608 cpumask_t suppress = CPU_MASK_NONE; 2608 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2609 int cpu, diag;
2610 unsigned long addr, val, bytesperword = 0, whichcpu = ~0UL;
2611 2609
2612 if (argc < 1 || argc > 3) 2610 if (argc < 1 || argc > 3)
2613 return KDB_ARGCOUNT; 2611 return KDB_ARGCOUNT;
2614 2612
2615 snprintf(buf, sizeof(buf), "per_cpu__%s", argv[1]); 2613 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2616 if (!kdbgetsymval(buf, &symtab)) { 2614 if (diag)
2617 kdb_printf("%s is not a per_cpu variable\n", argv[1]); 2615 return diag;
2618 return KDB_BADADDR; 2616
2619 }
2620 if (argc >= 2) { 2617 if (argc >= 2) {
2621 diag = kdbgetularg(argv[2], &bytesperword); 2618 diag = kdbgetularg(argv[2], &bytesperword);
2622 if (diag) 2619 if (diag)
@@ -2649,46 +2646,25 @@ static int kdb_per_cpu(int argc, const char **argv)
2649#define KDB_PCU(cpu) 0 2646#define KDB_PCU(cpu) 0
2650#endif 2647#endif
2651#endif 2648#endif
2652
2653 for_each_online_cpu(cpu) { 2649 for_each_online_cpu(cpu) {
2650 if (KDB_FLAG(CMD_INTERRUPT))
2651 return 0;
2652
2654 if (whichcpu != ~0UL && whichcpu != cpu) 2653 if (whichcpu != ~0UL && whichcpu != cpu)
2655 continue; 2654 continue;
2656 addr = symtab.sym_start + KDB_PCU(cpu); 2655 addr = symaddr + KDB_PCU(cpu);
2657 diag = kdb_getword(&val, addr, bytesperword); 2656 diag = kdb_getword(&val, addr, bytesperword);
2658 if (diag) { 2657 if (diag) {
2659 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to " 2658 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2660 "read, diag=%d\n", cpu, addr, diag); 2659 "read, diag=%d\n", cpu, addr, diag);
2661 continue; 2660 continue;
2662 } 2661 }
2663#ifdef CONFIG_SMP
2664 if (!val) {
2665 cpu_set(cpu, suppress);
2666 continue;
2667 }
2668#endif /* CONFIG_SMP */
2669 kdb_printf("%5d ", cpu); 2662 kdb_printf("%5d ", cpu);
2670 kdb_md_line(fmtstr, addr, 2663 kdb_md_line(fmtstr, addr,
2671 bytesperword == KDB_WORD_SIZE, 2664 bytesperword == KDB_WORD_SIZE,
2672 1, bytesperword, 1, 1, 0); 2665 1, bytesperword, 1, 1, 0);
2673 } 2666 }
2674 if (cpus_weight(suppress) == 0)
2675 return 0;
2676 kdb_printf("Zero suppressed cpu(s):");
2677 for (cpu = first_cpu(suppress); cpu < num_possible_cpus();
2678 cpu = next_cpu(cpu, suppress)) {
2679 kdb_printf(" %d", cpu);
2680 if (cpu == num_possible_cpus() - 1 ||
2681 next_cpu(cpu, suppress) != cpu + 1)
2682 continue;
2683 while (cpu < num_possible_cpus() &&
2684 next_cpu(cpu, suppress) == cpu + 1)
2685 ++cpu;
2686 kdb_printf("-%d", cpu);
2687 }
2688 kdb_printf("\n");
2689
2690#undef KDB_PCU 2667#undef KDB_PCU
2691
2692 return 0; 2668 return 0;
2693} 2669}
2694 2670
diff --git a/samples/Kconfig b/samples/Kconfig
index 954a1d550c5f..e03cf0e374d7 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -54,4 +54,11 @@ config SAMPLE_KFIFO
54 54
55 If in doubt, say "N" here. 55 If in doubt, say "N" here.
56 56
57config SAMPLE_KDB
58 tristate "Build kdb command exmaple -- loadable modules only"
59 depends on KGDB_KDB && m
60 help
61 Build an example of how to dynamically add the hello
62 command to the kdb shell.
63
57endif # SAMPLES 64endif # SAMPLES
diff --git a/samples/Makefile b/samples/Makefile
index 76b3c3455c29..f26c0959fd86 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -1,4 +1,4 @@
1# Makefile for Linux samples code 1# Makefile for Linux samples code
2 2
3obj-$(CONFIG_SAMPLES) += kobject/ kprobes/ tracepoints/ trace_events/ \ 3obj-$(CONFIG_SAMPLES) += kobject/ kprobes/ tracepoints/ trace_events/ \
4 hw_breakpoint/ kfifo/ 4 hw_breakpoint/ kfifo/ kdb/
diff --git a/samples/kdb/Makefile b/samples/kdb/Makefile
new file mode 100644
index 000000000000..fbedf39d9356
--- /dev/null
+++ b/samples/kdb/Makefile
@@ -0,0 +1 @@
obj-$(CONFIG_SAMPLE_KDB) += kdb_hello.o
diff --git a/samples/kdb/kdb_hello.c b/samples/kdb/kdb_hello.c
new file mode 100644
index 000000000000..c1c2fa0f62c2
--- /dev/null
+++ b/samples/kdb/kdb_hello.c
@@ -0,0 +1,60 @@
1/*
2 * Created by: Jason Wessel <jason.wessel@windriver.com>
3 *
4 * Copyright (c) 2010 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/module.h>
12#include <linux/kdb.h>
13
14/*
15 * All kdb shell command call backs receive argc and argv, where
16 * argv[0] is the command the end user typed
17 */
18static int kdb_hello_cmd(int argc, const char **argv)
19{
20 if (argc > 1)
21 return KDB_ARGCOUNT;
22
23 if (argc)
24 kdb_printf("Hello %s.\n", argv[1]);
25 else
26 kdb_printf("Hello world!\n");
27
28 return 0;
29}
30
31
32static int __init kdb_hello_cmd_init(void)
33{
34 /*
35 * Registration of a dynamically added kdb command is done with
36 * kdb_register() with the arguments being:
37 * 1: The name of the shell command
38 * 2: The function that processes the command
39 * 3: Description of the usage of any arguments
40 * 4: Descriptive text when you run help
41 * 5: Number of characters to complete the command
42 * 0 == type the whole command
43 * 1 == match both "g" and "go" for example
44 */
45 kdb_register("hello", kdb_hello_cmd, "[string]",
46 "Say Hello World or Hello [string]", 0);
47 return 0;
48}
49
50static void __exit kdb_hello_cmd_exit(void)
51{
52 kdb_unregister("hello");
53}
54
55module_init(kdb_hello_cmd_init);
56module_exit(kdb_hello_cmd_exit);
57
58MODULE_AUTHOR("WindRiver");
59MODULE_DESCRIPTION("KDB example to add a hello command");
60MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-04 03:25:11 -0500