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authorAl Viro <viro@ftp.linux.org.uk>2011-08-18 15:03:19 -0400
committerRichard Weinberger <richard@nod.at>2011-11-02 09:14:51 -0400
commit6582b7f7743da6ce3e3714e9e8b18e0e073d4acd (patch)
tree649346d2333865ccd4bb4d560ceb50c39139c5c2 /arch/um/sys-x86
parent858ba94499b4f48e9eb0be7cf0092f1ea9460fef (diff)
um: merge arch/um/sys-{i386,x86_64}
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/sys-x86')
-rw-r--r--arch/um/sys-x86/Makefile45
-rw-r--r--arch/um/sys-x86/bug.c21
-rw-r--r--arch/um/sys-x86/bugs_32.c74
-rw-r--r--arch/um/sys-x86/bugs_64.c15
-rw-r--r--arch/um/sys-x86/checksum_32.S458
-rw-r--r--arch/um/sys-x86/delay_32.c60
-rw-r--r--arch/um/sys-x86/delay_64.c60
-rw-r--r--arch/um/sys-x86/elfcore.c83
-rw-r--r--arch/um/sys-x86/fault.c28
-rw-r--r--arch/um/sys-x86/ksyms.c13
-rw-r--r--arch/um/sys-x86/ldt.c502
-rw-r--r--arch/um/sys-x86/mem_32.c62
-rw-r--r--arch/um/sys-x86/mem_64.c26
-rw-r--r--arch/um/sys-x86/ptrace_32.c273
-rw-r--r--arch/um/sys-x86/ptrace_64.c271
-rw-r--r--arch/um/sys-x86/ptrace_user.c21
-rw-r--r--arch/um/sys-x86/setjmp_32.S58
-rw-r--r--arch/um/sys-x86/setjmp_64.S54
-rw-r--r--arch/um/sys-x86/signal_32.c498
-rw-r--r--arch/um/sys-x86/signal_64.c255
-rw-r--r--arch/um/sys-x86/stub_32.S51
-rw-r--r--arch/um/sys-x86/stub_64.S66
-rw-r--r--arch/um/sys-x86/stub_segv_32.c17
-rw-r--r--arch/um/sys-x86/stub_segv_64.c22
-rw-r--r--arch/um/sys-x86/sys_call_table_32.S28
-rw-r--r--arch/um/sys-x86/sys_call_table_64.c64
-rw-r--r--arch/um/sys-x86/syscalls_32.c66
-rw-r--r--arch/um/sys-x86/syscalls_64.c102
-rw-r--r--arch/um/sys-x86/sysrq_32.c101
-rw-r--r--arch/um/sys-x86/sysrq_64.c41
-rw-r--r--arch/um/sys-x86/tls_32.c396
-rw-r--r--arch/um/sys-x86/tls_64.c17
-rw-r--r--arch/um/sys-x86/user-offsets.c86
-rw-r--r--arch/um/sys-x86/vdso/Makefile90
-rw-r--r--arch/um/sys-x86/vdso/checkundef.sh10
-rw-r--r--arch/um/sys-x86/vdso/um_vdso.c71
-rw-r--r--arch/um/sys-x86/vdso/vdso-layout.lds.S64
-rw-r--r--arch/um/sys-x86/vdso/vdso-note.S12
-rw-r--r--arch/um/sys-x86/vdso/vdso.S10
-rw-r--r--arch/um/sys-x86/vdso/vdso.lds.S32
-rw-r--r--arch/um/sys-x86/vdso/vma.c74
41 files changed, 4297 insertions, 0 deletions
diff --git a/arch/um/sys-x86/Makefile b/arch/um/sys-x86/Makefile
new file mode 100644
index 000000000000..671de0b45dd8
--- /dev/null
+++ b/arch/um/sys-x86/Makefile
@@ -0,0 +1,45 @@
1#
2# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3#
4
5ifeq ($(CONFIG_X86_32),y)
6 BITS := 32
7else
8 BITS := 64
9endif
10
11obj-y = bug.o bugs_$(BITS).o delay_$(BITS).o fault.o ksyms.o ldt.o \
12 ptrace_$(BITS).o ptrace_user.o setjmp_$(BITS).o signal_$(BITS).o \
13 stub_$(BITS).o stub_segv_$(BITS).o syscalls_$(BITS).o \
14 sys_call_table_$(BITS).o sysrq_$(BITS).o tls_$(BITS).o mem_$(BITS).o
15
16ifeq ($(CONFIG_X86_32),y)
17
18obj-y += checksum_32.o
19obj-$(CONFIG_BINFMT_ELF) += elfcore.o
20
21subarch-obj-y = lib/string_32.o lib/atomic64_32.o lib/atomic64_cx8_32.o
22subarch-obj-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += lib/rwsem.o
23subarch-obj-$(CONFIG_HIGHMEM) += mm/highmem_32.o
24subarch-obj-$(CONFIG_MODULES) += kernel/module.o
25
26else
27
28obj-y += vdso/
29
30subarch-obj-y = lib/csum-partial_64.o lib/memcpy_64.o lib/thunk_64.o \
31 lib/rwsem.o
32
33endif
34
35subarch-obj-$(CONFIG_MODULES) += kernel/module.o
36
37USER_OBJS := bugs_$(BITS).o ptrace_user.o fault.o
38
39extra-y += user-offsets.s
40$(obj)/user-offsets.s: c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS)
41
42UNPROFILE_OBJS := stub_segv.o
43CFLAGS_stub_segv.o := $(CFLAGS_NO_HARDENING)
44
45include arch/um/scripts/Makefile.rules
diff --git a/arch/um/sys-x86/bug.c b/arch/um/sys-x86/bug.c
new file mode 100644
index 000000000000..e8034e363d83
--- /dev/null
+++ b/arch/um/sys-x86/bug.c
@@ -0,0 +1,21 @@
1/*
2 * Copyright (C) 2006 Jeff Dike (jdike@addtoit.com)
3 * Licensed under the GPL V2
4 */
5
6#include <linux/uaccess.h>
7
8/*
9 * Mostly copied from i386/x86_86 - eliminated the eip < PAGE_OFFSET because
10 * that's not relevant in skas mode.
11 */
12
13int is_valid_bugaddr(unsigned long eip)
14{
15 unsigned short ud2;
16
17 if (probe_kernel_address((unsigned short __user *)eip, ud2))
18 return 0;
19
20 return ud2 == 0x0b0f;
21}
diff --git a/arch/um/sys-x86/bugs_32.c b/arch/um/sys-x86/bugs_32.c
new file mode 100644
index 000000000000..7058e1fa903b
--- /dev/null
+++ b/arch/um/sys-x86/bugs_32.c
@@ -0,0 +1,74 @@
1/*
2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <signal.h>
7#include "kern_util.h"
8#include "longjmp.h"
9#include "task.h"
10#include "sysdep/ptrace.h"
11
12/* Set during early boot */
13static int host_has_cmov = 1;
14static jmp_buf cmov_test_return;
15
16static void cmov_sigill_test_handler(int sig)
17{
18 host_has_cmov = 0;
19 longjmp(cmov_test_return, 1);
20}
21
22void arch_check_bugs(void)
23{
24 struct sigaction old, new;
25
26 printk(UM_KERN_INFO "Checking for host processor cmov support...");
27 new.sa_handler = cmov_sigill_test_handler;
28
29 /* Make sure that SIGILL is enabled after the handler longjmps back */
30 new.sa_flags = SA_NODEFER;
31 sigemptyset(&new.sa_mask);
32 sigaction(SIGILL, &new, &old);
33
34 if (setjmp(cmov_test_return) == 0) {
35 unsigned long foo = 0;
36 __asm__ __volatile__("cmovz %0, %1" : "=r" (foo) : "0" (foo));
37 printk(UM_KERN_CONT "Yes\n");
38 } else
39 printk(UM_KERN_CONT "No\n");
40
41 sigaction(SIGILL, &old, &new);
42}
43
44void arch_examine_signal(int sig, struct uml_pt_regs *regs)
45{
46 unsigned char tmp[2];
47
48 /*
49 * This is testing for a cmov (0x0f 0x4x) instruction causing a
50 * SIGILL in init.
51 */
52 if ((sig != SIGILL) || (TASK_PID(get_current()) != 1))
53 return;
54
55 if (copy_from_user_proc(tmp, (void *) UPT_IP(regs), 2)) {
56 printk(UM_KERN_ERR "SIGILL in init, could not read "
57 "instructions!\n");
58 return;
59 }
60
61 if ((tmp[0] != 0x0f) || ((tmp[1] & 0xf0) != 0x40))
62 return;
63
64 if (host_has_cmov == 0)
65 printk(UM_KERN_ERR "SIGILL caused by cmov, which this "
66 "processor doesn't implement. Boot a filesystem "
67 "compiled for older processors");
68 else if (host_has_cmov == 1)
69 printk(UM_KERN_ERR "SIGILL caused by cmov, which this "
70 "processor claims to implement");
71 else
72 printk(UM_KERN_ERR "Bad value for host_has_cmov (%d)",
73 host_has_cmov);
74}
diff --git a/arch/um/sys-x86/bugs_64.c b/arch/um/sys-x86/bugs_64.c
new file mode 100644
index 000000000000..44e02ba2a265
--- /dev/null
+++ b/arch/um/sys-x86/bugs_64.c
@@ -0,0 +1,15 @@
1/*
2 * Copyright 2003 PathScale, Inc.
3 *
4 * Licensed under the GPL
5 */
6
7#include "sysdep/ptrace.h"
8
9void arch_check_bugs(void)
10{
11}
12
13void arch_examine_signal(int sig, struct uml_pt_regs *regs)
14{
15}
diff --git a/arch/um/sys-x86/checksum_32.S b/arch/um/sys-x86/checksum_32.S
new file mode 100644
index 000000000000..f058d2f82e18
--- /dev/null
+++ b/arch/um/sys-x86/checksum_32.S
@@ -0,0 +1,458 @@
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * IP/TCP/UDP checksumming routines
7 *
8 * Authors: Jorge Cwik, <jorge@laser.satlink.net>
9 * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
10 * Tom May, <ftom@netcom.com>
11 * Pentium Pro/II routines:
12 * Alexander Kjeldaas <astor@guardian.no>
13 * Finn Arne Gangstad <finnag@guardian.no>
14 * Lots of code moved from tcp.c and ip.c; see those files
15 * for more names.
16 *
17 * Changes: Ingo Molnar, converted csum_partial_copy() to 2.1 exception
18 * handling.
19 * Andi Kleen, add zeroing on error
20 * converted to pure assembler
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
26 */
27
28#include <asm/errno.h>
29
30/*
31 * computes a partial checksum, e.g. for TCP/UDP fragments
32 */
33
34/*
35unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
36 */
37
38.text
39.align 4
40.globl csum_partial
41
42#ifndef CONFIG_X86_USE_PPRO_CHECKSUM
43
44 /*
45 * Experiments with Ethernet and SLIP connections show that buff
46 * is aligned on either a 2-byte or 4-byte boundary. We get at
47 * least a twofold speedup on 486 and Pentium if it is 4-byte aligned.
48 * Fortunately, it is easy to convert 2-byte alignment to 4-byte
49 * alignment for the unrolled loop.
50 */
51csum_partial:
52 pushl %esi
53 pushl %ebx
54 movl 20(%esp),%eax # Function arg: unsigned int sum
55 movl 16(%esp),%ecx # Function arg: int len
56 movl 12(%esp),%esi # Function arg: unsigned char *buff
57 testl $2, %esi # Check alignment.
58 jz 2f # Jump if alignment is ok.
59 subl $2, %ecx # Alignment uses up two bytes.
60 jae 1f # Jump if we had at least two bytes.
61 addl $2, %ecx # ecx was < 2. Deal with it.
62 jmp 4f
631: movw (%esi), %bx
64 addl $2, %esi
65 addw %bx, %ax
66 adcl $0, %eax
672:
68 movl %ecx, %edx
69 shrl $5, %ecx
70 jz 2f
71 testl %esi, %esi
721: movl (%esi), %ebx
73 adcl %ebx, %eax
74 movl 4(%esi), %ebx
75 adcl %ebx, %eax
76 movl 8(%esi), %ebx
77 adcl %ebx, %eax
78 movl 12(%esi), %ebx
79 adcl %ebx, %eax
80 movl 16(%esi), %ebx
81 adcl %ebx, %eax
82 movl 20(%esi), %ebx
83 adcl %ebx, %eax
84 movl 24(%esi), %ebx
85 adcl %ebx, %eax
86 movl 28(%esi), %ebx
87 adcl %ebx, %eax
88 lea 32(%esi), %esi
89 dec %ecx
90 jne 1b
91 adcl $0, %eax
922: movl %edx, %ecx
93 andl $0x1c, %edx
94 je 4f
95 shrl $2, %edx # This clears CF
963: adcl (%esi), %eax
97 lea 4(%esi), %esi
98 dec %edx
99 jne 3b
100 adcl $0, %eax
1014: andl $3, %ecx
102 jz 7f
103 cmpl $2, %ecx
104 jb 5f
105 movw (%esi),%cx
106 leal 2(%esi),%esi
107 je 6f
108 shll $16,%ecx
1095: movb (%esi),%cl
1106: addl %ecx,%eax
111 adcl $0, %eax
1127:
113 popl %ebx
114 popl %esi
115 ret
116
117#else
118
119/* Version for PentiumII/PPro */
120
121csum_partial:
122 pushl %esi
123 pushl %ebx
124 movl 20(%esp),%eax # Function arg: unsigned int sum
125 movl 16(%esp),%ecx # Function arg: int len
126 movl 12(%esp),%esi # Function arg: const unsigned char *buf
127
128 testl $2, %esi
129 jnz 30f
13010:
131 movl %ecx, %edx
132 movl %ecx, %ebx
133 andl $0x7c, %ebx
134 shrl $7, %ecx
135 addl %ebx,%esi
136 shrl $2, %ebx
137 negl %ebx
138 lea 45f(%ebx,%ebx,2), %ebx
139 testl %esi, %esi
140 jmp *%ebx
141
142 # Handle 2-byte-aligned regions
14320: addw (%esi), %ax
144 lea 2(%esi), %esi
145 adcl $0, %eax
146 jmp 10b
147
14830: subl $2, %ecx
149 ja 20b
150 je 32f
151 movzbl (%esi),%ebx # csumming 1 byte, 2-aligned
152 addl %ebx, %eax
153 adcl $0, %eax
154 jmp 80f
15532:
156 addw (%esi), %ax # csumming 2 bytes, 2-aligned
157 adcl $0, %eax
158 jmp 80f
159
16040:
161 addl -128(%esi), %eax
162 adcl -124(%esi), %eax
163 adcl -120(%esi), %eax
164 adcl -116(%esi), %eax
165 adcl -112(%esi), %eax
166 adcl -108(%esi), %eax
167 adcl -104(%esi), %eax
168 adcl -100(%esi), %eax
169 adcl -96(%esi), %eax
170 adcl -92(%esi), %eax
171 adcl -88(%esi), %eax
172 adcl -84(%esi), %eax
173 adcl -80(%esi), %eax
174 adcl -76(%esi), %eax
175 adcl -72(%esi), %eax
176 adcl -68(%esi), %eax
177 adcl -64(%esi), %eax
178 adcl -60(%esi), %eax
179 adcl -56(%esi), %eax
180 adcl -52(%esi), %eax
181 adcl -48(%esi), %eax
182 adcl -44(%esi), %eax
183 adcl -40(%esi), %eax
184 adcl -36(%esi), %eax
185 adcl -32(%esi), %eax
186 adcl -28(%esi), %eax
187 adcl -24(%esi), %eax
188 adcl -20(%esi), %eax
189 adcl -16(%esi), %eax
190 adcl -12(%esi), %eax
191 adcl -8(%esi), %eax
192 adcl -4(%esi), %eax
19345:
194 lea 128(%esi), %esi
195 adcl $0, %eax
196 dec %ecx
197 jge 40b
198 movl %edx, %ecx
19950: andl $3, %ecx
200 jz 80f
201
202 # Handle the last 1-3 bytes without jumping
203 notl %ecx # 1->2, 2->1, 3->0, higher bits are masked
204 movl $0xffffff,%ebx # by the shll and shrl instructions
205 shll $3,%ecx
206 shrl %cl,%ebx
207 andl -128(%esi),%ebx # esi is 4-aligned so should be ok
208 addl %ebx,%eax
209 adcl $0,%eax
21080:
211 popl %ebx
212 popl %esi
213 ret
214
215#endif
216
217/*
218unsigned int csum_partial_copy_generic (const char *src, char *dst,
219 int len, int sum, int *src_err_ptr, int *dst_err_ptr)
220 */
221
222/*
223 * Copy from ds while checksumming, otherwise like csum_partial
224 *
225 * The macros SRC and DST specify the type of access for the instruction.
226 * thus we can call a custom exception handler for all access types.
227 *
228 * FIXME: could someone double-check whether I haven't mixed up some SRC and
229 * DST definitions? It's damn hard to trigger all cases. I hope I got
230 * them all but there's no guarantee.
231 */
232
233#define SRC(y...) \
234 9999: y; \
235 .section __ex_table, "a"; \
236 .long 9999b, 6001f ; \
237 .previous
238
239#define DST(y...) \
240 9999: y; \
241 .section __ex_table, "a"; \
242 .long 9999b, 6002f ; \
243 .previous
244
245.align 4
246
247#ifndef CONFIG_X86_USE_PPRO_CHECKSUM
248
249#define ARGBASE 16
250#define FP 12
251
252csum_partial_copy_generic_i386:
253 subl $4,%esp
254 pushl %edi
255 pushl %esi
256 pushl %ebx
257 movl ARGBASE+16(%esp),%eax # sum
258 movl ARGBASE+12(%esp),%ecx # len
259 movl ARGBASE+4(%esp),%esi # src
260 movl ARGBASE+8(%esp),%edi # dst
261
262 testl $2, %edi # Check alignment.
263 jz 2f # Jump if alignment is ok.
264 subl $2, %ecx # Alignment uses up two bytes.
265 jae 1f # Jump if we had at least two bytes.
266 addl $2, %ecx # ecx was < 2. Deal with it.
267 jmp 4f
268SRC(1: movw (%esi), %bx )
269 addl $2, %esi
270DST( movw %bx, (%edi) )
271 addl $2, %edi
272 addw %bx, %ax
273 adcl $0, %eax
2742:
275 movl %ecx, FP(%esp)
276 shrl $5, %ecx
277 jz 2f
278 testl %esi, %esi
279SRC(1: movl (%esi), %ebx )
280SRC( movl 4(%esi), %edx )
281 adcl %ebx, %eax
282DST( movl %ebx, (%edi) )
283 adcl %edx, %eax
284DST( movl %edx, 4(%edi) )
285
286SRC( movl 8(%esi), %ebx )
287SRC( movl 12(%esi), %edx )
288 adcl %ebx, %eax
289DST( movl %ebx, 8(%edi) )
290 adcl %edx, %eax
291DST( movl %edx, 12(%edi) )
292
293SRC( movl 16(%esi), %ebx )
294SRC( movl 20(%esi), %edx )
295 adcl %ebx, %eax
296DST( movl %ebx, 16(%edi) )
297 adcl %edx, %eax
298DST( movl %edx, 20(%edi) )
299
300SRC( movl 24(%esi), %ebx )
301SRC( movl 28(%esi), %edx )
302 adcl %ebx, %eax
303DST( movl %ebx, 24(%edi) )
304 adcl %edx, %eax
305DST( movl %edx, 28(%edi) )
306
307 lea 32(%esi), %esi
308 lea 32(%edi), %edi
309 dec %ecx
310 jne 1b
311 adcl $0, %eax
3122: movl FP(%esp), %edx
313 movl %edx, %ecx
314 andl $0x1c, %edx
315 je 4f
316 shrl $2, %edx # This clears CF
317SRC(3: movl (%esi), %ebx )
318 adcl %ebx, %eax
319DST( movl %ebx, (%edi) )
320 lea 4(%esi), %esi
321 lea 4(%edi), %edi
322 dec %edx
323 jne 3b
324 adcl $0, %eax
3254: andl $3, %ecx
326 jz 7f
327 cmpl $2, %ecx
328 jb 5f
329SRC( movw (%esi), %cx )
330 leal 2(%esi), %esi
331DST( movw %cx, (%edi) )
332 leal 2(%edi), %edi
333 je 6f
334 shll $16,%ecx
335SRC(5: movb (%esi), %cl )
336DST( movb %cl, (%edi) )
3376: addl %ecx, %eax
338 adcl $0, %eax
3397:
3405000:
341
342# Exception handler:
343.section .fixup, "ax"
344
3456001:
346 movl ARGBASE+20(%esp), %ebx # src_err_ptr
347 movl $-EFAULT, (%ebx)
348
349 # zero the complete destination - computing the rest
350 # is too much work
351 movl ARGBASE+8(%esp), %edi # dst
352 movl ARGBASE+12(%esp), %ecx # len
353 xorl %eax,%eax
354 rep ; stosb
355
356 jmp 5000b
357
3586002:
359 movl ARGBASE+24(%esp), %ebx # dst_err_ptr
360 movl $-EFAULT,(%ebx)
361 jmp 5000b
362
363.previous
364
365 popl %ebx
366 popl %esi
367 popl %edi
368 popl %ecx # equivalent to addl $4,%esp
369 ret
370
371#else
372
373/* Version for PentiumII/PPro */
374
375#define ROUND1(x) \
376 SRC(movl x(%esi), %ebx ) ; \
377 addl %ebx, %eax ; \
378 DST(movl %ebx, x(%edi) ) ;
379
380#define ROUND(x) \
381 SRC(movl x(%esi), %ebx ) ; \
382 adcl %ebx, %eax ; \
383 DST(movl %ebx, x(%edi) ) ;
384
385#define ARGBASE 12
386
387csum_partial_copy_generic_i386:
388 pushl %ebx
389 pushl %edi
390 pushl %esi
391 movl ARGBASE+4(%esp),%esi #src
392 movl ARGBASE+8(%esp),%edi #dst
393 movl ARGBASE+12(%esp),%ecx #len
394 movl ARGBASE+16(%esp),%eax #sum
395# movl %ecx, %edx
396 movl %ecx, %ebx
397 movl %esi, %edx
398 shrl $6, %ecx
399 andl $0x3c, %ebx
400 negl %ebx
401 subl %ebx, %esi
402 subl %ebx, %edi
403 lea -1(%esi),%edx
404 andl $-32,%edx
405 lea 3f(%ebx,%ebx), %ebx
406 testl %esi, %esi
407 jmp *%ebx
4081: addl $64,%esi
409 addl $64,%edi
410 SRC(movb -32(%edx),%bl) ; SRC(movb (%edx),%bl)
411 ROUND1(-64) ROUND(-60) ROUND(-56) ROUND(-52)
412 ROUND (-48) ROUND(-44) ROUND(-40) ROUND(-36)
413 ROUND (-32) ROUND(-28) ROUND(-24) ROUND(-20)
414 ROUND (-16) ROUND(-12) ROUND(-8) ROUND(-4)
4153: adcl $0,%eax
416 addl $64, %edx
417 dec %ecx
418 jge 1b
4194: movl ARGBASE+12(%esp),%edx #len
420 andl $3, %edx
421 jz 7f
422 cmpl $2, %edx
423 jb 5f
424SRC( movw (%esi), %dx )
425 leal 2(%esi), %esi
426DST( movw %dx, (%edi) )
427 leal 2(%edi), %edi
428 je 6f
429 shll $16,%edx
4305:
431SRC( movb (%esi), %dl )
432DST( movb %dl, (%edi) )
4336: addl %edx, %eax
434 adcl $0, %eax
4357:
436.section .fixup, "ax"
4376001: movl ARGBASE+20(%esp), %ebx # src_err_ptr
438 movl $-EFAULT, (%ebx)
439 # zero the complete destination (computing the rest is too much work)
440 movl ARGBASE+8(%esp),%edi # dst
441 movl ARGBASE+12(%esp),%ecx # len
442 xorl %eax,%eax
443 rep; stosb
444 jmp 7b
4456002: movl ARGBASE+24(%esp), %ebx # dst_err_ptr
446 movl $-EFAULT, (%ebx)
447 jmp 7b
448.previous
449
450 popl %esi
451 popl %edi
452 popl %ebx
453 ret
454
455#undef ROUND
456#undef ROUND1
457
458#endif
diff --git a/arch/um/sys-x86/delay_32.c b/arch/um/sys-x86/delay_32.c
new file mode 100644
index 000000000000..f3fe1a688f7e
--- /dev/null
+++ b/arch/um/sys-x86/delay_32.c
@@ -0,0 +1,60 @@
1/*
2 * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
3 * Mostly copied from arch/x86/lib/delay.c
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/delay.h>
13#include <asm/param.h>
14
15void __delay(unsigned long loops)
16{
17 asm volatile(
18 "test %0,%0\n"
19 "jz 3f\n"
20 "jmp 1f\n"
21
22 ".align 16\n"
23 "1: jmp 2f\n"
24
25 ".align 16\n"
26 "2: dec %0\n"
27 " jnz 2b\n"
28 "3: dec %0\n"
29
30 : /* we don't need output */
31 : "a" (loops)
32 );
33}
34EXPORT_SYMBOL(__delay);
35
36inline void __const_udelay(unsigned long xloops)
37{
38 int d0;
39
40 xloops *= 4;
41 asm("mull %%edx"
42 : "=d" (xloops), "=&a" (d0)
43 : "1" (xloops), "0"
44 (loops_per_jiffy * (HZ/4)));
45
46 __delay(++xloops);
47}
48EXPORT_SYMBOL(__const_udelay);
49
50void __udelay(unsigned long usecs)
51{
52 __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
53}
54EXPORT_SYMBOL(__udelay);
55
56void __ndelay(unsigned long nsecs)
57{
58 __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
59}
60EXPORT_SYMBOL(__ndelay);
diff --git a/arch/um/sys-x86/delay_64.c b/arch/um/sys-x86/delay_64.c
new file mode 100644
index 000000000000..f3fe1a688f7e
--- /dev/null
+++ b/arch/um/sys-x86/delay_64.c
@@ -0,0 +1,60 @@
1/*
2 * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
3 * Mostly copied from arch/x86/lib/delay.c
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/delay.h>
13#include <asm/param.h>
14
15void __delay(unsigned long loops)
16{
17 asm volatile(
18 "test %0,%0\n"
19 "jz 3f\n"
20 "jmp 1f\n"
21
22 ".align 16\n"
23 "1: jmp 2f\n"
24
25 ".align 16\n"
26 "2: dec %0\n"
27 " jnz 2b\n"
28 "3: dec %0\n"
29
30 : /* we don't need output */
31 : "a" (loops)
32 );
33}
34EXPORT_SYMBOL(__delay);
35
36inline void __const_udelay(unsigned long xloops)
37{
38 int d0;
39
40 xloops *= 4;
41 asm("mull %%edx"
42 : "=d" (xloops), "=&a" (d0)
43 : "1" (xloops), "0"
44 (loops_per_jiffy * (HZ/4)));
45
46 __delay(++xloops);
47}
48EXPORT_SYMBOL(__const_udelay);
49
50void __udelay(unsigned long usecs)
51{
52 __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
53}
54EXPORT_SYMBOL(__udelay);
55
56void __ndelay(unsigned long nsecs)
57{
58 __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
59}
60EXPORT_SYMBOL(__ndelay);
diff --git a/arch/um/sys-x86/elfcore.c b/arch/um/sys-x86/elfcore.c
new file mode 100644
index 000000000000..6bb49b687c97
--- /dev/null
+++ b/arch/um/sys-x86/elfcore.c
@@ -0,0 +1,83 @@
1#include <linux/elf.h>
2#include <linux/coredump.h>
3#include <linux/fs.h>
4#include <linux/mm.h>
5
6#include <asm/elf.h>
7
8
9Elf32_Half elf_core_extra_phdrs(void)
10{
11 return vsyscall_ehdr ? (((struct elfhdr *)vsyscall_ehdr)->e_phnum) : 0;
12}
13
14int elf_core_write_extra_phdrs(struct file *file, loff_t offset, size_t *size,
15 unsigned long limit)
16{
17 if ( vsyscall_ehdr ) {
18 const struct elfhdr *const ehdrp =
19 (struct elfhdr *) vsyscall_ehdr;
20 const struct elf_phdr *const phdrp =
21 (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
22 int i;
23 Elf32_Off ofs = 0;
24
25 for (i = 0; i < ehdrp->e_phnum; ++i) {
26 struct elf_phdr phdr = phdrp[i];
27
28 if (phdr.p_type == PT_LOAD) {
29 ofs = phdr.p_offset = offset;
30 offset += phdr.p_filesz;
31 } else {
32 phdr.p_offset += ofs;
33 }
34 phdr.p_paddr = 0; /* match other core phdrs */
35 *size += sizeof(phdr);
36 if (*size > limit
37 || !dump_write(file, &phdr, sizeof(phdr)))
38 return 0;
39 }
40 }
41 return 1;
42}
43
44int elf_core_write_extra_data(struct file *file, size_t *size,
45 unsigned long limit)
46{
47 if ( vsyscall_ehdr ) {
48 const struct elfhdr *const ehdrp =
49 (struct elfhdr *) vsyscall_ehdr;
50 const struct elf_phdr *const phdrp =
51 (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
52 int i;
53
54 for (i = 0; i < ehdrp->e_phnum; ++i) {
55 if (phdrp[i].p_type == PT_LOAD) {
56 void *addr = (void *) phdrp[i].p_vaddr;
57 size_t filesz = phdrp[i].p_filesz;
58
59 *size += filesz;
60 if (*size > limit
61 || !dump_write(file, addr, filesz))
62 return 0;
63 }
64 }
65 }
66 return 1;
67}
68
69size_t elf_core_extra_data_size(void)
70{
71 if ( vsyscall_ehdr ) {
72 const struct elfhdr *const ehdrp =
73 (struct elfhdr *)vsyscall_ehdr;
74 const struct elf_phdr *const phdrp =
75 (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
76 int i;
77
78 for (i = 0; i < ehdrp->e_phnum; ++i)
79 if (phdrp[i].p_type == PT_LOAD)
80 return (size_t) phdrp[i].p_filesz;
81 }
82 return 0;
83}
diff --git a/arch/um/sys-x86/fault.c b/arch/um/sys-x86/fault.c
new file mode 100644
index 000000000000..d670f68532f4
--- /dev/null
+++ b/arch/um/sys-x86/fault.c
@@ -0,0 +1,28 @@
1/*
2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include "sysdep/ptrace.h"
7
8/* These two are from asm-um/uaccess.h and linux/module.h, check them. */
9struct exception_table_entry
10{
11 unsigned long insn;
12 unsigned long fixup;
13};
14
15const struct exception_table_entry *search_exception_tables(unsigned long add);
16
17/* Compare this to arch/i386/mm/extable.c:fixup_exception() */
18int arch_fixup(unsigned long address, struct uml_pt_regs *regs)
19{
20 const struct exception_table_entry *fixup;
21
22 fixup = search_exception_tables(address);
23 if (fixup != 0) {
24 UPT_IP(regs) = fixup->fixup;
25 return 1;
26 }
27 return 0;
28}
diff --git a/arch/um/sys-x86/ksyms.c b/arch/um/sys-x86/ksyms.c
new file mode 100644
index 000000000000..2e8f43ec6214
--- /dev/null
+++ b/arch/um/sys-x86/ksyms.c
@@ -0,0 +1,13 @@
1#include <linux/module.h>
2#include <asm/string.h>
3#include <asm/checksum.h>
4
5#ifndef CONFIG_X86_32
6/*XXX: we need them because they would be exported by x86_64 */
7#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
8EXPORT_SYMBOL(memcpy);
9#else
10EXPORT_SYMBOL(__memcpy);
11#endif
12#endif
13EXPORT_SYMBOL(csum_partial);
diff --git a/arch/um/sys-x86/ldt.c b/arch/um/sys-x86/ldt.c
new file mode 100644
index 000000000000..3f2bf208d884
--- /dev/null
+++ b/arch/um/sys-x86/ldt.c
@@ -0,0 +1,502 @@
1/*
2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <linux/mm.h>
7#include <linux/sched.h>
8#include <linux/slab.h>
9#include <asm/unistd.h>
10#include "os.h"
11#include "proc_mm.h"
12#include "skas.h"
13#include "skas_ptrace.h"
14#include "sysdep/tls.h"
15
16extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
17
18static long write_ldt_entry(struct mm_id *mm_idp, int func,
19 struct user_desc *desc, void **addr, int done)
20{
21 long res;
22
23 if (proc_mm) {
24 /*
25 * This is a special handling for the case, that the mm to
26 * modify isn't current->active_mm.
27 * If this is called directly by modify_ldt,
28 * (current->active_mm->context.skas.u == mm_idp)
29 * will be true. So no call to __switch_mm(mm_idp) is done.
30 * If this is called in case of init_new_ldt or PTRACE_LDT,
31 * mm_idp won't belong to current->active_mm, but child->mm.
32 * So we need to switch child's mm into our userspace, then
33 * later switch back.
34 *
35 * Note: I'm unsure: should interrupts be disabled here?
36 */
37 if (!current->active_mm || current->active_mm == &init_mm ||
38 mm_idp != &current->active_mm->context.id)
39 __switch_mm(mm_idp);
40 }
41
42 if (ptrace_ldt) {
43 struct ptrace_ldt ldt_op = (struct ptrace_ldt) {
44 .func = func,
45 .ptr = desc,
46 .bytecount = sizeof(*desc)};
47 u32 cpu;
48 int pid;
49
50 if (!proc_mm)
51 pid = mm_idp->u.pid;
52 else {
53 cpu = get_cpu();
54 pid = userspace_pid[cpu];
55 }
56
57 res = os_ptrace_ldt(pid, 0, (unsigned long) &ldt_op);
58
59 if (proc_mm)
60 put_cpu();
61 }
62 else {
63 void *stub_addr;
64 res = syscall_stub_data(mm_idp, (unsigned long *)desc,
65 (sizeof(*desc) + sizeof(long) - 1) &
66 ~(sizeof(long) - 1),
67 addr, &stub_addr);
68 if (!res) {
69 unsigned long args[] = { func,
70 (unsigned long)stub_addr,
71 sizeof(*desc),
72 0, 0, 0 };
73 res = run_syscall_stub(mm_idp, __NR_modify_ldt, args,
74 0, addr, done);
75 }
76 }
77
78 if (proc_mm) {
79 /*
80 * This is the second part of special handling, that makes
81 * PTRACE_LDT possible to implement.
82 */
83 if (current->active_mm && current->active_mm != &init_mm &&
84 mm_idp != &current->active_mm->context.id)
85 __switch_mm(&current->active_mm->context.id);
86 }
87
88 return res;
89}
90
91static long read_ldt_from_host(void __user * ptr, unsigned long bytecount)
92{
93 int res, n;
94 struct ptrace_ldt ptrace_ldt = (struct ptrace_ldt) {
95 .func = 0,
96 .bytecount = bytecount,
97 .ptr = kmalloc(bytecount, GFP_KERNEL)};
98 u32 cpu;
99
100 if (ptrace_ldt.ptr == NULL)
101 return -ENOMEM;
102
103 /*
104 * This is called from sys_modify_ldt only, so userspace_pid gives
105 * us the right number
106 */
107
108 cpu = get_cpu();
109 res = os_ptrace_ldt(userspace_pid[cpu], 0, (unsigned long) &ptrace_ldt);
110 put_cpu();
111 if (res < 0)
112 goto out;
113
114 n = copy_to_user(ptr, ptrace_ldt.ptr, res);
115 if (n != 0)
116 res = -EFAULT;
117
118 out:
119 kfree(ptrace_ldt.ptr);
120
121 return res;
122}
123
124/*
125 * In skas mode, we hold our own ldt data in UML.
126 * Thus, the code implementing sys_modify_ldt_skas
127 * is very similar to (and mostly stolen from) sys_modify_ldt
128 * for arch/i386/kernel/ldt.c
129 * The routines copied and modified in part are:
130 * - read_ldt
131 * - read_default_ldt
132 * - write_ldt
133 * - sys_modify_ldt_skas
134 */
135
136static int read_ldt(void __user * ptr, unsigned long bytecount)
137{
138 int i, err = 0;
139 unsigned long size;
140 uml_ldt_t * ldt = &current->mm->context.ldt;
141
142 if (!ldt->entry_count)
143 goto out;
144 if (bytecount > LDT_ENTRY_SIZE*LDT_ENTRIES)
145 bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES;
146 err = bytecount;
147
148 if (ptrace_ldt)
149 return read_ldt_from_host(ptr, bytecount);
150
151 mutex_lock(&ldt->lock);
152 if (ldt->entry_count <= LDT_DIRECT_ENTRIES) {
153 size = LDT_ENTRY_SIZE*LDT_DIRECT_ENTRIES;
154 if (size > bytecount)
155 size = bytecount;
156 if (copy_to_user(ptr, ldt->u.entries, size))
157 err = -EFAULT;
158 bytecount -= size;
159 ptr += size;
160 }
161 else {
162 for (i=0; i<ldt->entry_count/LDT_ENTRIES_PER_PAGE && bytecount;
163 i++) {
164 size = PAGE_SIZE;
165 if (size > bytecount)
166 size = bytecount;
167 if (copy_to_user(ptr, ldt->u.pages[i], size)) {
168 err = -EFAULT;
169 break;
170 }
171 bytecount -= size;
172 ptr += size;
173 }
174 }
175 mutex_unlock(&ldt->lock);
176
177 if (bytecount == 0 || err == -EFAULT)
178 goto out;
179
180 if (clear_user(ptr, bytecount))
181 err = -EFAULT;
182
183out:
184 return err;
185}
186
187static int read_default_ldt(void __user * ptr, unsigned long bytecount)
188{
189 int err;
190
191 if (bytecount > 5*LDT_ENTRY_SIZE)
192 bytecount = 5*LDT_ENTRY_SIZE;
193
194 err = bytecount;
195 /*
196 * UML doesn't support lcall7 and lcall27.
197 * So, we don't really have a default ldt, but emulate
198 * an empty ldt of common host default ldt size.
199 */
200 if (clear_user(ptr, bytecount))
201 err = -EFAULT;
202
203 return err;
204}
205
206static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
207{
208 uml_ldt_t * ldt = &current->mm->context.ldt;
209 struct mm_id * mm_idp = &current->mm->context.id;
210 int i, err;
211 struct user_desc ldt_info;
212 struct ldt_entry entry0, *ldt_p;
213 void *addr = NULL;
214
215 err = -EINVAL;
216 if (bytecount != sizeof(ldt_info))
217 goto out;
218 err = -EFAULT;
219 if (copy_from_user(&ldt_info, ptr, sizeof(ldt_info)))
220 goto out;
221
222 err = -EINVAL;
223 if (ldt_info.entry_number >= LDT_ENTRIES)
224 goto out;
225 if (ldt_info.contents == 3) {
226 if (func == 1)
227 goto out;
228 if (ldt_info.seg_not_present == 0)
229 goto out;
230 }
231
232 if (!ptrace_ldt)
233 mutex_lock(&ldt->lock);
234
235 err = write_ldt_entry(mm_idp, func, &ldt_info, &addr, 1);
236 if (err)
237 goto out_unlock;
238 else if (ptrace_ldt) {
239 /* With PTRACE_LDT available, this is used as a flag only */
240 ldt->entry_count = 1;
241 goto out;
242 }
243
244 if (ldt_info.entry_number >= ldt->entry_count &&
245 ldt_info.entry_number >= LDT_DIRECT_ENTRIES) {
246 for (i=ldt->entry_count/LDT_ENTRIES_PER_PAGE;
247 i*LDT_ENTRIES_PER_PAGE <= ldt_info.entry_number;
248 i++) {
249 if (i == 0)
250 memcpy(&entry0, ldt->u.entries,
251 sizeof(entry0));
252 ldt->u.pages[i] = (struct ldt_entry *)
253 __get_free_page(GFP_KERNEL|__GFP_ZERO);
254 if (!ldt->u.pages[i]) {
255 err = -ENOMEM;
256 /* Undo the change in host */
257 memset(&ldt_info, 0, sizeof(ldt_info));
258 write_ldt_entry(mm_idp, 1, &ldt_info, &addr, 1);
259 goto out_unlock;
260 }
261 if (i == 0) {
262 memcpy(ldt->u.pages[0], &entry0,
263 sizeof(entry0));
264 memcpy(ldt->u.pages[0]+1, ldt->u.entries+1,
265 sizeof(entry0)*(LDT_DIRECT_ENTRIES-1));
266 }
267 ldt->entry_count = (i + 1) * LDT_ENTRIES_PER_PAGE;
268 }
269 }
270 if (ldt->entry_count <= ldt_info.entry_number)
271 ldt->entry_count = ldt_info.entry_number + 1;
272
273 if (ldt->entry_count <= LDT_DIRECT_ENTRIES)
274 ldt_p = ldt->u.entries + ldt_info.entry_number;
275 else
276 ldt_p = ldt->u.pages[ldt_info.entry_number/LDT_ENTRIES_PER_PAGE] +
277 ldt_info.entry_number%LDT_ENTRIES_PER_PAGE;
278
279 if (ldt_info.base_addr == 0 && ldt_info.limit == 0 &&
280 (func == 1 || LDT_empty(&ldt_info))) {
281 ldt_p->a = 0;
282 ldt_p->b = 0;
283 }
284 else{
285 if (func == 1)
286 ldt_info.useable = 0;
287 ldt_p->a = LDT_entry_a(&ldt_info);
288 ldt_p->b = LDT_entry_b(&ldt_info);
289 }
290 err = 0;
291
292out_unlock:
293 mutex_unlock(&ldt->lock);
294out:
295 return err;
296}
297
298static long do_modify_ldt_skas(int func, void __user *ptr,
299 unsigned long bytecount)
300{
301 int ret = -ENOSYS;
302
303 switch (func) {
304 case 0:
305 ret = read_ldt(ptr, bytecount);
306 break;
307 case 1:
308 case 0x11:
309 ret = write_ldt(ptr, bytecount, func);
310 break;
311 case 2:
312 ret = read_default_ldt(ptr, bytecount);
313 break;
314 }
315 return ret;
316}
317
318static DEFINE_SPINLOCK(host_ldt_lock);
319static short dummy_list[9] = {0, -1};
320static short * host_ldt_entries = NULL;
321
322static void ldt_get_host_info(void)
323{
324 long ret;
325 struct ldt_entry * ldt;
326 short *tmp;
327 int i, size, k, order;
328
329 spin_lock(&host_ldt_lock);
330
331 if (host_ldt_entries != NULL) {
332 spin_unlock(&host_ldt_lock);
333 return;
334 }
335 host_ldt_entries = dummy_list+1;
336
337 spin_unlock(&host_ldt_lock);
338
339 for (i = LDT_PAGES_MAX-1, order=0; i; i>>=1, order++)
340 ;
341
342 ldt = (struct ldt_entry *)
343 __get_free_pages(GFP_KERNEL|__GFP_ZERO, order);
344 if (ldt == NULL) {
345 printk(KERN_ERR "ldt_get_host_info: couldn't allocate buffer "
346 "for host ldt\n");
347 return;
348 }
349
350 ret = modify_ldt(0, ldt, (1<<order)*PAGE_SIZE);
351 if (ret < 0) {
352 printk(KERN_ERR "ldt_get_host_info: couldn't read host ldt\n");
353 goto out_free;
354 }
355 if (ret == 0) {
356 /* default_ldt is active, simply write an empty entry 0 */
357 host_ldt_entries = dummy_list;
358 goto out_free;
359 }
360
361 for (i=0, size=0; i<ret/LDT_ENTRY_SIZE; i++) {
362 if (ldt[i].a != 0 || ldt[i].b != 0)
363 size++;
364 }
365
366 if (size < ARRAY_SIZE(dummy_list))
367 host_ldt_entries = dummy_list;
368 else {
369 size = (size + 1) * sizeof(dummy_list[0]);
370 tmp = kmalloc(size, GFP_KERNEL);
371 if (tmp == NULL) {
372 printk(KERN_ERR "ldt_get_host_info: couldn't allocate "
373 "host ldt list\n");
374 goto out_free;
375 }
376 host_ldt_entries = tmp;
377 }
378
379 for (i=0, k=0; i<ret/LDT_ENTRY_SIZE; i++) {
380 if (ldt[i].a != 0 || ldt[i].b != 0)
381 host_ldt_entries[k++] = i;
382 }
383 host_ldt_entries[k] = -1;
384
385out_free:
386 free_pages((unsigned long)ldt, order);
387}
388
389long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
390{
391 struct user_desc desc;
392 short * num_p;
393 int i;
394 long page, err=0;
395 void *addr = NULL;
396 struct proc_mm_op copy;
397
398
399 if (!ptrace_ldt)
400 mutex_init(&new_mm->ldt.lock);
401
402 if (!from_mm) {
403 memset(&desc, 0, sizeof(desc));
404 /*
405 * We have to initialize a clean ldt.
406 */
407 if (proc_mm) {
408 /*
409 * If the new mm was created using proc_mm, host's
410 * default-ldt currently is assigned, which normally
411 * contains the call-gates for lcall7 and lcall27.
412 * To remove these gates, we simply write an empty
413 * entry as number 0 to the host.
414 */
415 err = write_ldt_entry(&new_mm->id, 1, &desc, &addr, 1);
416 }
417 else{
418 /*
419 * Now we try to retrieve info about the ldt, we
420 * inherited from the host. All ldt-entries found
421 * will be reset in the following loop
422 */
423 ldt_get_host_info();
424 for (num_p=host_ldt_entries; *num_p != -1; num_p++) {
425 desc.entry_number = *num_p;
426 err = write_ldt_entry(&new_mm->id, 1, &desc,
427 &addr, *(num_p + 1) == -1);
428 if (err)
429 break;
430 }
431 }
432 new_mm->ldt.entry_count = 0;
433
434 goto out;
435 }
436
437 if (proc_mm) {
438 /*
439 * We have a valid from_mm, so we now have to copy the LDT of
440 * from_mm to new_mm, because using proc_mm an new mm with
441 * an empty/default LDT was created in new_mm()
442 */
443 copy = ((struct proc_mm_op) { .op = MM_COPY_SEGMENTS,
444 .u =
445 { .copy_segments =
446 from_mm->id.u.mm_fd } } );
447 i = os_write_file(new_mm->id.u.mm_fd, &copy, sizeof(copy));
448 if (i != sizeof(copy))
449 printk(KERN_ERR "new_mm : /proc/mm copy_segments "
450 "failed, err = %d\n", -i);
451 }
452
453 if (!ptrace_ldt) {
454 /*
455 * Our local LDT is used to supply the data for
456 * modify_ldt(READLDT), if PTRACE_LDT isn't available,
457 * i.e., we have to use the stub for modify_ldt, which
458 * can't handle the big read buffer of up to 64kB.
459 */
460 mutex_lock(&from_mm->ldt.lock);
461 if (from_mm->ldt.entry_count <= LDT_DIRECT_ENTRIES)
462 memcpy(new_mm->ldt.u.entries, from_mm->ldt.u.entries,
463 sizeof(new_mm->ldt.u.entries));
464 else {
465 i = from_mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE;
466 while (i-->0) {
467 page = __get_free_page(GFP_KERNEL|__GFP_ZERO);
468 if (!page) {
469 err = -ENOMEM;
470 break;
471 }
472 new_mm->ldt.u.pages[i] =
473 (struct ldt_entry *) page;
474 memcpy(new_mm->ldt.u.pages[i],
475 from_mm->ldt.u.pages[i], PAGE_SIZE);
476 }
477 }
478 new_mm->ldt.entry_count = from_mm->ldt.entry_count;
479 mutex_unlock(&from_mm->ldt.lock);
480 }
481
482 out:
483 return err;
484}
485
486
487void free_ldt(struct mm_context *mm)
488{
489 int i;
490
491 if (!ptrace_ldt && mm->ldt.entry_count > LDT_DIRECT_ENTRIES) {
492 i = mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE;
493 while (i-- > 0)
494 free_page((long) mm->ldt.u.pages[i]);
495 }
496 mm->ldt.entry_count = 0;
497}
498
499int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
500{
501 return do_modify_ldt_skas(func, ptr, bytecount);
502}
diff --git a/arch/um/sys-x86/mem_32.c b/arch/um/sys-x86/mem_32.c
new file mode 100644
index 000000000000..639900a6fde9
--- /dev/null
+++ b/arch/um/sys-x86/mem_32.c
@@ -0,0 +1,62 @@
1/*
2 * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#include <linux/mm.h>
10#include <asm/page.h>
11#include <asm/mman.h>
12
13static struct vm_area_struct gate_vma;
14
15static int __init gate_vma_init(void)
16{
17 if (!FIXADDR_USER_START)
18 return 0;
19
20 gate_vma.vm_mm = NULL;
21 gate_vma.vm_start = FIXADDR_USER_START;
22 gate_vma.vm_end = FIXADDR_USER_END;
23 gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC;
24 gate_vma.vm_page_prot = __P101;
25
26 /*
27 * Make sure the vDSO gets into every core dump.
28 * Dumping its contents makes post-mortem fully interpretable later
29 * without matching up the same kernel and hardware config to see
30 * what PC values meant.
31 */
32 gate_vma.vm_flags |= VM_ALWAYSDUMP;
33
34 return 0;
35}
36__initcall(gate_vma_init);
37
38struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
39{
40 return FIXADDR_USER_START ? &gate_vma : NULL;
41}
42
43int in_gate_area_no_mm(unsigned long addr)
44{
45 if (!FIXADDR_USER_START)
46 return 0;
47
48 if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
49 return 1;
50
51 return 0;
52}
53
54int in_gate_area(struct mm_struct *mm, unsigned long addr)
55{
56 struct vm_area_struct *vma = get_gate_vma(mm);
57
58 if (!vma)
59 return 0;
60
61 return (addr >= vma->vm_start) && (addr < vma->vm_end);
62}
diff --git a/arch/um/sys-x86/mem_64.c b/arch/um/sys-x86/mem_64.c
new file mode 100644
index 000000000000..546518727a73
--- /dev/null
+++ b/arch/um/sys-x86/mem_64.c
@@ -0,0 +1,26 @@
1#include "linux/mm.h"
2#include "asm/page.h"
3#include "asm/mman.h"
4
5const char *arch_vma_name(struct vm_area_struct *vma)
6{
7 if (vma->vm_mm && vma->vm_start == um_vdso_addr)
8 return "[vdso]";
9
10 return NULL;
11}
12
13struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
14{
15 return NULL;
16}
17
18int in_gate_area(struct mm_struct *mm, unsigned long addr)
19{
20 return 0;
21}
22
23int in_gate_area_no_mm(unsigned long addr)
24{
25 return 0;
26}
diff --git a/arch/um/sys-x86/ptrace_32.c b/arch/um/sys-x86/ptrace_32.c
new file mode 100644
index 000000000000..a174fde2531c
--- /dev/null
+++ b/arch/um/sys-x86/ptrace_32.c
@@ -0,0 +1,273 @@
1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/mm.h"
7#include "linux/sched.h"
8#include "asm/uaccess.h"
9#include "skas.h"
10
11extern int arch_switch_tls(struct task_struct *to);
12
13void arch_switch_to(struct task_struct *to)
14{
15 int err = arch_switch_tls(to);
16 if (!err)
17 return;
18
19 if (err != -EINVAL)
20 printk(KERN_WARNING "arch_switch_tls failed, errno %d, "
21 "not EINVAL\n", -err);
22 else
23 printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
24}
25
26int is_syscall(unsigned long addr)
27{
28 unsigned short instr;
29 int n;
30
31 n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
32 if (n) {
33 /* access_process_vm() grants access to vsyscall and stub,
34 * while copy_from_user doesn't. Maybe access_process_vm is
35 * slow, but that doesn't matter, since it will be called only
36 * in case of singlestepping, if copy_from_user failed.
37 */
38 n = access_process_vm(current, addr, &instr, sizeof(instr), 0);
39 if (n != sizeof(instr)) {
40 printk(KERN_ERR "is_syscall : failed to read "
41 "instruction from 0x%lx\n", addr);
42 return 1;
43 }
44 }
45 /* int 0x80 or sysenter */
46 return (instr == 0x80cd) || (instr == 0x340f);
47}
48
49/* determines which flags the user has access to. */
50/* 1 = access 0 = no access */
51#define FLAG_MASK 0x00044dd5
52
53static const int reg_offsets[] = {
54 [EBX] = HOST_EBX,
55 [ECX] = HOST_ECX,
56 [EDX] = HOST_EDX,
57 [ESI] = HOST_ESI,
58 [EDI] = HOST_EDI,
59 [EBP] = HOST_EBP,
60 [EAX] = HOST_EAX,
61 [DS] = HOST_DS,
62 [ES] = HOST_ES,
63 [FS] = HOST_FS,
64 [GS] = HOST_GS,
65 [EIP] = HOST_IP,
66 [CS] = HOST_CS,
67 [EFL] = HOST_EFLAGS,
68 [UESP] = HOST_SP,
69 [SS] = HOST_SS,
70};
71
72int putreg(struct task_struct *child, int regno, unsigned long value)
73{
74 regno >>= 2;
75 switch (regno) {
76 case EBX:
77 case ECX:
78 case EDX:
79 case ESI:
80 case EDI:
81 case EBP:
82 case EAX:
83 case EIP:
84 case UESP:
85 break;
86 case FS:
87 if (value && (value & 3) != 3)
88 return -EIO;
89 break;
90 case GS:
91 if (value && (value & 3) != 3)
92 return -EIO;
93 break;
94 case DS:
95 case ES:
96 if (value && (value & 3) != 3)
97 return -EIO;
98 value &= 0xffff;
99 break;
100 case SS:
101 case CS:
102 if ((value & 3) != 3)
103 return -EIO;
104 value &= 0xffff;
105 break;
106 case EFL:
107 value &= FLAG_MASK;
108 child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
109 return 0;
110 case ORIG_EAX:
111 child->thread.regs.regs.syscall = value;
112 return 0;
113 default :
114 panic("Bad register in putreg() : %d\n", regno);
115 }
116 child->thread.regs.regs.gp[reg_offsets[regno]] = value;
117 return 0;
118}
119
120int poke_user(struct task_struct *child, long addr, long data)
121{
122 if ((addr & 3) || addr < 0)
123 return -EIO;
124
125 if (addr < MAX_REG_OFFSET)
126 return putreg(child, addr, data);
127 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
128 (addr <= offsetof(struct user, u_debugreg[7]))) {
129 addr -= offsetof(struct user, u_debugreg[0]);
130 addr = addr >> 2;
131 if ((addr == 4) || (addr == 5))
132 return -EIO;
133 child->thread.arch.debugregs[addr] = data;
134 return 0;
135 }
136 return -EIO;
137}
138
139unsigned long getreg(struct task_struct *child, int regno)
140{
141 unsigned long mask = ~0UL;
142
143 regno >>= 2;
144 switch (regno) {
145 case ORIG_EAX:
146 return child->thread.regs.regs.syscall;
147 case FS:
148 case GS:
149 case DS:
150 case ES:
151 case SS:
152 case CS:
153 mask = 0xffff;
154 break;
155 case EIP:
156 case UESP:
157 case EAX:
158 case EBX:
159 case ECX:
160 case EDX:
161 case ESI:
162 case EDI:
163 case EBP:
164 case EFL:
165 break;
166 default:
167 panic("Bad register in getreg() : %d\n", regno);
168 }
169 return mask & child->thread.regs.regs.gp[reg_offsets[regno]];
170}
171
172/* read the word at location addr in the USER area. */
173int peek_user(struct task_struct *child, long addr, long data)
174{
175 unsigned long tmp;
176
177 if ((addr & 3) || addr < 0)
178 return -EIO;
179
180 tmp = 0; /* Default return condition */
181 if (addr < MAX_REG_OFFSET) {
182 tmp = getreg(child, addr);
183 }
184 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
185 (addr <= offsetof(struct user, u_debugreg[7]))) {
186 addr -= offsetof(struct user, u_debugreg[0]);
187 addr = addr >> 2;
188 tmp = child->thread.arch.debugregs[addr];
189 }
190 return put_user(tmp, (unsigned long __user *) data);
191}
192
193static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
194{
195 int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
196 struct user_i387_struct fpregs;
197
198 err = save_fp_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
199 if (err)
200 return err;
201
202 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
203 if(n > 0)
204 return -EFAULT;
205
206 return n;
207}
208
209static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
210{
211 int n, cpu = ((struct thread_info *) child->stack)->cpu;
212 struct user_i387_struct fpregs;
213
214 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
215 if (n > 0)
216 return -EFAULT;
217
218 return restore_fp_registers(userspace_pid[cpu],
219 (unsigned long *) &fpregs);
220}
221
222static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
223{
224 int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
225 struct user_fxsr_struct fpregs;
226
227 err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
228 if (err)
229 return err;
230
231 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
232 if(n > 0)
233 return -EFAULT;
234
235 return n;
236}
237
238static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
239{
240 int n, cpu = ((struct thread_info *) child->stack)->cpu;
241 struct user_fxsr_struct fpregs;
242
243 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
244 if (n > 0)
245 return -EFAULT;
246
247 return restore_fpx_registers(userspace_pid[cpu],
248 (unsigned long *) &fpregs);
249}
250
251long subarch_ptrace(struct task_struct *child, long request,
252 unsigned long addr, unsigned long data)
253{
254 int ret = -EIO;
255 void __user *datap = (void __user *) data;
256 switch (request) {
257 case PTRACE_GETFPREGS: /* Get the child FPU state. */
258 ret = get_fpregs(datap, child);
259 break;
260 case PTRACE_SETFPREGS: /* Set the child FPU state. */
261 ret = set_fpregs(datap, child);
262 break;
263 case PTRACE_GETFPXREGS: /* Get the child FPU state. */
264 ret = get_fpxregs(datap, child);
265 break;
266 case PTRACE_SETFPXREGS: /* Set the child FPU state. */
267 ret = set_fpxregs(datap, child);
268 break;
269 default:
270 ret = -EIO;
271 }
272 return ret;
273}
diff --git a/arch/um/sys-x86/ptrace_64.c b/arch/um/sys-x86/ptrace_64.c
new file mode 100644
index 000000000000..44e68e0c0d10
--- /dev/null
+++ b/arch/um/sys-x86/ptrace_64.c
@@ -0,0 +1,271 @@
1/*
2 * Copyright 2003 PathScale, Inc.
3 * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 *
5 * Licensed under the GPL
6 */
7
8#include <linux/mm.h>
9#include <linux/sched.h>
10#include <linux/errno.h>
11#define __FRAME_OFFSETS
12#include <asm/ptrace.h>
13#include <asm/uaccess.h>
14
15/*
16 * determines which flags the user has access to.
17 * 1 = access 0 = no access
18 */
19#define FLAG_MASK 0x44dd5UL
20
21static const int reg_offsets[] =
22{
23 [R8 >> 3] = HOST_R8,
24 [R9 >> 3] = HOST_R9,
25 [R10 >> 3] = HOST_R10,
26 [R11 >> 3] = HOST_R11,
27 [R12 >> 3] = HOST_R12,
28 [R13 >> 3] = HOST_R13,
29 [R14 >> 3] = HOST_R14,
30 [R15 >> 3] = HOST_R15,
31 [RIP >> 3] = HOST_IP,
32 [RSP >> 3] = HOST_SP,
33 [RAX >> 3] = HOST_RAX,
34 [RBX >> 3] = HOST_RBX,
35 [RCX >> 3] = HOST_RCX,
36 [RDX >> 3] = HOST_RDX,
37 [RSI >> 3] = HOST_RSI,
38 [RDI >> 3] = HOST_RDI,
39 [RBP >> 3] = HOST_RBP,
40 [CS >> 3] = HOST_CS,
41 [SS >> 3] = HOST_SS,
42 [FS_BASE >> 3] = HOST_FS_BASE,
43 [GS_BASE >> 3] = HOST_GS_BASE,
44 [DS >> 3] = HOST_DS,
45 [ES >> 3] = HOST_ES,
46 [FS >> 3] = HOST_FS,
47 [GS >> 3] = HOST_GS,
48 [EFLAGS >> 3] = HOST_EFLAGS,
49 [ORIG_RAX >> 3] = HOST_ORIG_RAX,
50};
51
52int putreg(struct task_struct *child, int regno, unsigned long value)
53{
54#ifdef TIF_IA32
55 /*
56 * Some code in the 64bit emulation may not be 64bit clean.
57 * Don't take any chances.
58 */
59 if (test_tsk_thread_flag(child, TIF_IA32))
60 value &= 0xffffffff;
61#endif
62 switch (regno) {
63 case R8:
64 case R9:
65 case R10:
66 case R11:
67 case R12:
68 case R13:
69 case R14:
70 case R15:
71 case RIP:
72 case RSP:
73 case RAX:
74 case RBX:
75 case RCX:
76 case RDX:
77 case RSI:
78 case RDI:
79 case RBP:
80 case ORIG_RAX:
81 break;
82
83 case FS:
84 case GS:
85 case DS:
86 case ES:
87 case SS:
88 case CS:
89 if (value && (value & 3) != 3)
90 return -EIO;
91 value &= 0xffff;
92 break;
93
94 case FS_BASE:
95 case GS_BASE:
96 if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
97 return -EIO;
98 break;
99
100 case EFLAGS:
101 value &= FLAG_MASK;
102 child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
103 return 0;
104
105 default:
106 panic("Bad register in putreg(): %d\n", regno);
107 }
108
109 child->thread.regs.regs.gp[reg_offsets[regno >> 3]] = value;
110 return 0;
111}
112
113int poke_user(struct task_struct *child, long addr, long data)
114{
115 if ((addr & 3) || addr < 0)
116 return -EIO;
117
118 if (addr < MAX_REG_OFFSET)
119 return putreg(child, addr, data);
120 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
121 (addr <= offsetof(struct user, u_debugreg[7]))) {
122 addr -= offsetof(struct user, u_debugreg[0]);
123 addr = addr >> 2;
124 if ((addr == 4) || (addr == 5))
125 return -EIO;
126 child->thread.arch.debugregs[addr] = data;
127 return 0;
128 }
129 return -EIO;
130}
131
132unsigned long getreg(struct task_struct *child, int regno)
133{
134 unsigned long mask = ~0UL;
135#ifdef TIF_IA32
136 if (test_tsk_thread_flag(child, TIF_IA32))
137 mask = 0xffffffff;
138#endif
139 switch (regno) {
140 case R8:
141 case R9:
142 case R10:
143 case R11:
144 case R12:
145 case R13:
146 case R14:
147 case R15:
148 case RIP:
149 case RSP:
150 case RAX:
151 case RBX:
152 case RCX:
153 case RDX:
154 case RSI:
155 case RDI:
156 case RBP:
157 case ORIG_RAX:
158 case EFLAGS:
159 case FS_BASE:
160 case GS_BASE:
161 break;
162 case FS:
163 case GS:
164 case DS:
165 case ES:
166 case SS:
167 case CS:
168 mask = 0xffff;
169 break;
170 default:
171 panic("Bad register in getreg: %d\n", regno);
172 }
173 return mask & child->thread.regs.regs.gp[reg_offsets[regno >> 3]];
174}
175
176int peek_user(struct task_struct *child, long addr, long data)
177{
178 /* read the word at location addr in the USER area. */
179 unsigned long tmp;
180
181 if ((addr & 3) || addr < 0)
182 return -EIO;
183
184 tmp = 0; /* Default return condition */
185 if (addr < MAX_REG_OFFSET)
186 tmp = getreg(child, addr);
187 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
188 (addr <= offsetof(struct user, u_debugreg[7]))) {
189 addr -= offsetof(struct user, u_debugreg[0]);
190 addr = addr >> 2;
191 tmp = child->thread.arch.debugregs[addr];
192 }
193 return put_user(tmp, (unsigned long *) data);
194}
195
196/* XXX Mostly copied from sys-i386 */
197int is_syscall(unsigned long addr)
198{
199 unsigned short instr;
200 int n;
201
202 n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
203 if (n) {
204 /*
205 * access_process_vm() grants access to vsyscall and stub,
206 * while copy_from_user doesn't. Maybe access_process_vm is
207 * slow, but that doesn't matter, since it will be called only
208 * in case of singlestepping, if copy_from_user failed.
209 */
210 n = access_process_vm(current, addr, &instr, sizeof(instr), 0);
211 if (n != sizeof(instr)) {
212 printk("is_syscall : failed to read instruction from "
213 "0x%lx\n", addr);
214 return 1;
215 }
216 }
217 /* sysenter */
218 return instr == 0x050f;
219}
220
221static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
222{
223 int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
224 long fpregs[HOST_FP_SIZE];
225
226 BUG_ON(sizeof(*buf) != sizeof(fpregs));
227 err = save_fp_registers(userspace_pid[cpu], fpregs);
228 if (err)
229 return err;
230
231 n = copy_to_user(buf, fpregs, sizeof(fpregs));
232 if (n > 0)
233 return -EFAULT;
234
235 return n;
236}
237
238static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
239{
240 int n, cpu = ((struct thread_info *) child->stack)->cpu;
241 long fpregs[HOST_FP_SIZE];
242
243 BUG_ON(sizeof(*buf) != sizeof(fpregs));
244 n = copy_from_user(fpregs, buf, sizeof(fpregs));
245 if (n > 0)
246 return -EFAULT;
247
248 return restore_fp_registers(userspace_pid[cpu], fpregs);
249}
250
251long subarch_ptrace(struct task_struct *child, long request,
252 unsigned long addr, unsigned long data)
253{
254 int ret = -EIO;
255 void __user *datap = (void __user *) data;
256
257 switch (request) {
258 case PTRACE_GETFPREGS: /* Get the child FPU state. */
259 ret = get_fpregs(datap, child);
260 break;
261 case PTRACE_SETFPREGS: /* Set the child FPU state. */
262 ret = set_fpregs(datap, child);
263 break;
264 case PTRACE_ARCH_PRCTL:
265 /* XXX Calls ptrace on the host - needs some SMP thinking */
266 ret = arch_prctl(child, data, (void __user *) addr);
267 break;
268 }
269
270 return ret;
271}
diff --git a/arch/um/sys-x86/ptrace_user.c b/arch/um/sys-x86/ptrace_user.c
new file mode 100644
index 000000000000..3960ca1dd35a
--- /dev/null
+++ b/arch/um/sys-x86/ptrace_user.c
@@ -0,0 +1,21 @@
1/*
2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <errno.h>
7#include "ptrace_user.h"
8
9int ptrace_getregs(long pid, unsigned long *regs_out)
10{
11 if (ptrace(PTRACE_GETREGS, pid, 0, regs_out) < 0)
12 return -errno;
13 return 0;
14}
15
16int ptrace_setregs(long pid, unsigned long *regs)
17{
18 if (ptrace(PTRACE_SETREGS, pid, 0, regs) < 0)
19 return -errno;
20 return 0;
21}
diff --git a/arch/um/sys-x86/setjmp_32.S b/arch/um/sys-x86/setjmp_32.S
new file mode 100644
index 000000000000..b766792c9933
--- /dev/null
+++ b/arch/um/sys-x86/setjmp_32.S
@@ -0,0 +1,58 @@
1#
2# arch/i386/setjmp.S
3#
4# setjmp/longjmp for the i386 architecture
5#
6
7#
8# The jmp_buf is assumed to contain the following, in order:
9# %ebx
10# %esp
11# %ebp
12# %esi
13# %edi
14# <return address>
15#
16
17 .text
18 .align 4
19 .globl setjmp
20 .type setjmp, @function
21setjmp:
22#ifdef _REGPARM
23 movl %eax,%edx
24#else
25 movl 4(%esp),%edx
26#endif
27 popl %ecx # Return address, and adjust the stack
28 xorl %eax,%eax # Return value
29 movl %ebx,(%edx)
30 movl %esp,4(%edx) # Post-return %esp!
31 pushl %ecx # Make the call/return stack happy
32 movl %ebp,8(%edx)
33 movl %esi,12(%edx)
34 movl %edi,16(%edx)
35 movl %ecx,20(%edx) # Return address
36 ret
37
38 .size setjmp,.-setjmp
39
40 .text
41 .align 4
42 .globl longjmp
43 .type longjmp, @function
44longjmp:
45#ifdef _REGPARM
46 xchgl %eax,%edx
47#else
48 movl 4(%esp),%edx # jmp_ptr address
49 movl 8(%esp),%eax # Return value
50#endif
51 movl (%edx),%ebx
52 movl 4(%edx),%esp
53 movl 8(%edx),%ebp
54 movl 12(%edx),%esi
55 movl 16(%edx),%edi
56 jmp *20(%edx)
57
58 .size longjmp,.-longjmp
diff --git a/arch/um/sys-x86/setjmp_64.S b/arch/um/sys-x86/setjmp_64.S
new file mode 100644
index 000000000000..45f547b4043e
--- /dev/null
+++ b/arch/um/sys-x86/setjmp_64.S
@@ -0,0 +1,54 @@
1#
2# arch/x86_64/setjmp.S
3#
4# setjmp/longjmp for the x86-64 architecture
5#
6
7#
8# The jmp_buf is assumed to contain the following, in order:
9# %rbx
10# %rsp (post-return)
11# %rbp
12# %r12
13# %r13
14# %r14
15# %r15
16# <return address>
17#
18
19 .text
20 .align 4
21 .globl setjmp
22 .type setjmp, @function
23setjmp:
24 pop %rsi # Return address, and adjust the stack
25 xorl %eax,%eax # Return value
26 movq %rbx,(%rdi)
27 movq %rsp,8(%rdi) # Post-return %rsp!
28 push %rsi # Make the call/return stack happy
29 movq %rbp,16(%rdi)
30 movq %r12,24(%rdi)
31 movq %r13,32(%rdi)
32 movq %r14,40(%rdi)
33 movq %r15,48(%rdi)
34 movq %rsi,56(%rdi) # Return address
35 ret
36
37 .size setjmp,.-setjmp
38
39 .text
40 .align 4
41 .globl longjmp
42 .type longjmp, @function
43longjmp:
44 movl %esi,%eax # Return value (int)
45 movq (%rdi),%rbx
46 movq 8(%rdi),%rsp
47 movq 16(%rdi),%rbp
48 movq 24(%rdi),%r12
49 movq 32(%rdi),%r13
50 movq 40(%rdi),%r14
51 movq 48(%rdi),%r15
52 jmp *56(%rdi)
53
54 .size longjmp,.-longjmp
diff --git a/arch/um/sys-x86/signal_32.c b/arch/um/sys-x86/signal_32.c
new file mode 100644
index 000000000000..bcbfb0d64813
--- /dev/null
+++ b/arch/um/sys-x86/signal_32.c
@@ -0,0 +1,498 @@
1/*
2 * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <linux/ptrace.h>
7#include <asm/unistd.h>
8#include <asm/uaccess.h>
9#include <asm/ucontext.h>
10#include "frame_kern.h"
11#include "skas.h"
12
13/*
14 * FPU tag word conversions.
15 */
16
17static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
18{
19 unsigned int tmp; /* to avoid 16 bit prefixes in the code */
20
21 /* Transform each pair of bits into 01 (valid) or 00 (empty) */
22 tmp = ~twd;
23 tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
24 /* and move the valid bits to the lower byte. */
25 tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
26 tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
27 tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
28 return tmp;
29}
30
31static inline unsigned long twd_fxsr_to_i387(struct user_fxsr_struct *fxsave)
32{
33 struct _fpxreg *st = NULL;
34 unsigned long twd = (unsigned long) fxsave->twd;
35 unsigned long tag;
36 unsigned long ret = 0xffff0000;
37 int i;
38
39#define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16)
40
41 for (i = 0; i < 8; i++) {
42 if (twd & 0x1) {
43 st = (struct _fpxreg *) FPREG_ADDR(fxsave, i);
44
45 switch (st->exponent & 0x7fff) {
46 case 0x7fff:
47 tag = 2; /* Special */
48 break;
49 case 0x0000:
50 if ( !st->significand[0] &&
51 !st->significand[1] &&
52 !st->significand[2] &&
53 !st->significand[3] ) {
54 tag = 1; /* Zero */
55 } else {
56 tag = 2; /* Special */
57 }
58 break;
59 default:
60 if (st->significand[3] & 0x8000) {
61 tag = 0; /* Valid */
62 } else {
63 tag = 2; /* Special */
64 }
65 break;
66 }
67 } else {
68 tag = 3; /* Empty */
69 }
70 ret |= (tag << (2 * i));
71 twd = twd >> 1;
72 }
73 return ret;
74}
75
76static int convert_fxsr_to_user(struct _fpstate __user *buf,
77 struct user_fxsr_struct *fxsave)
78{
79 unsigned long env[7];
80 struct _fpreg __user *to;
81 struct _fpxreg *from;
82 int i;
83
84 env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul;
85 env[1] = (unsigned long)fxsave->swd | 0xffff0000ul;
86 env[2] = twd_fxsr_to_i387(fxsave);
87 env[3] = fxsave->fip;
88 env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
89 env[5] = fxsave->foo;
90 env[6] = fxsave->fos;
91
92 if (__copy_to_user(buf, env, 7 * sizeof(unsigned long)))
93 return 1;
94
95 to = &buf->_st[0];
96 from = (struct _fpxreg *) &fxsave->st_space[0];
97 for (i = 0; i < 8; i++, to++, from++) {
98 unsigned long __user *t = (unsigned long __user *)to;
99 unsigned long *f = (unsigned long *)from;
100
101 if (__put_user(*f, t) ||
102 __put_user(*(f + 1), t + 1) ||
103 __put_user(from->exponent, &to->exponent))
104 return 1;
105 }
106 return 0;
107}
108
109static int convert_fxsr_from_user(struct user_fxsr_struct *fxsave,
110 struct _fpstate __user *buf)
111{
112 unsigned long env[7];
113 struct _fpxreg *to;
114 struct _fpreg __user *from;
115 int i;
116
117 if (copy_from_user( env, buf, 7 * sizeof(long)))
118 return 1;
119
120 fxsave->cwd = (unsigned short)(env[0] & 0xffff);
121 fxsave->swd = (unsigned short)(env[1] & 0xffff);
122 fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
123 fxsave->fip = env[3];
124 fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16);
125 fxsave->fcs = (env[4] & 0xffff);
126 fxsave->foo = env[5];
127 fxsave->fos = env[6];
128
129 to = (struct _fpxreg *) &fxsave->st_space[0];
130 from = &buf->_st[0];
131 for (i = 0; i < 8; i++, to++, from++) {
132 unsigned long *t = (unsigned long *)to;
133 unsigned long __user *f = (unsigned long __user *)from;
134
135 if (__get_user(*t, f) ||
136 __get_user(*(t + 1), f + 1) ||
137 __get_user(to->exponent, &from->exponent))
138 return 1;
139 }
140 return 0;
141}
142
143extern int have_fpx_regs;
144
145static int copy_sc_from_user(struct pt_regs *regs,
146 struct sigcontext __user *from)
147{
148 struct sigcontext sc;
149 int err, pid;
150
151 err = copy_from_user(&sc, from, sizeof(sc));
152 if (err)
153 return err;
154
155 pid = userspace_pid[current_thread_info()->cpu];
156
157#define GETREG(regno, regname) regs->regs.gp[HOST_##regno] = sc.regname
158
159 GETREG(GS, gs);
160 GETREG(FS, fs);
161 GETREG(ES, es);
162 GETREG(DS, ds);
163 GETREG(EDI, di);
164 GETREG(ESI, si);
165 GETREG(EBP, bp);
166 GETREG(SP, sp);
167 GETREG(EBX, bx);
168 GETREG(EDX, dx);
169 GETREG(ECX, cx);
170 GETREG(EAX, ax);
171 GETREG(IP, ip);
172 GETREG(CS, cs);
173 GETREG(EFLAGS, flags);
174 GETREG(SS, ss);
175
176#undef GETREG
177 if (have_fpx_regs) {
178 struct user_fxsr_struct fpx;
179
180 err = copy_from_user(&fpx,
181 &((struct _fpstate __user *)sc.fpstate)->_fxsr_env[0],
182 sizeof(struct user_fxsr_struct));
183 if (err)
184 return 1;
185
186 err = convert_fxsr_from_user(&fpx, sc.fpstate);
187 if (err)
188 return 1;
189
190 err = restore_fpx_registers(pid, (unsigned long *) &fpx);
191 if (err < 0) {
192 printk(KERN_ERR "copy_sc_from_user - "
193 "restore_fpx_registers failed, errno = %d\n",
194 -err);
195 return 1;
196 }
197 } else {
198 struct user_i387_struct fp;
199
200 err = copy_from_user(&fp, sc.fpstate,
201 sizeof(struct user_i387_struct));
202 if (err)
203 return 1;
204
205 err = restore_fp_registers(pid, (unsigned long *) &fp);
206 if (err < 0) {
207 printk(KERN_ERR "copy_sc_from_user - "
208 "restore_fp_registers failed, errno = %d\n",
209 -err);
210 return 1;
211 }
212 }
213
214 return 0;
215}
216
217static int copy_sc_to_user(struct sigcontext __user *to,
218 struct _fpstate __user *to_fp, struct pt_regs *regs,
219 unsigned long sp)
220{
221 struct sigcontext sc;
222 struct faultinfo * fi = &current->thread.arch.faultinfo;
223 int err, pid;
224 memset(&sc, 0, sizeof(struct sigcontext));
225
226 sc.gs = REGS_GS(regs->regs.gp);
227 sc.fs = REGS_FS(regs->regs.gp);
228 sc.es = REGS_ES(regs->regs.gp);
229 sc.ds = REGS_DS(regs->regs.gp);
230 sc.di = REGS_EDI(regs->regs.gp);
231 sc.si = REGS_ESI(regs->regs.gp);
232 sc.bp = REGS_EBP(regs->regs.gp);
233 sc.sp = sp;
234 sc.bx = REGS_EBX(regs->regs.gp);
235 sc.dx = REGS_EDX(regs->regs.gp);
236 sc.cx = REGS_ECX(regs->regs.gp);
237 sc.ax = REGS_EAX(regs->regs.gp);
238 sc.ip = REGS_IP(regs->regs.gp);
239 sc.cs = REGS_CS(regs->regs.gp);
240 sc.flags = REGS_EFLAGS(regs->regs.gp);
241 sc.sp_at_signal = regs->regs.gp[UESP];
242 sc.ss = regs->regs.gp[SS];
243 sc.cr2 = fi->cr2;
244 sc.err = fi->error_code;
245 sc.trapno = fi->trap_no;
246
247 to_fp = (to_fp ? to_fp : (struct _fpstate __user *) (to + 1));
248 sc.fpstate = to_fp;
249
250 pid = userspace_pid[current_thread_info()->cpu];
251 if (have_fpx_regs) {
252 struct user_fxsr_struct fpx;
253
254 err = save_fpx_registers(pid, (unsigned long *) &fpx);
255 if (err < 0){
256 printk(KERN_ERR "copy_sc_to_user - save_fpx_registers "
257 "failed, errno = %d\n", err);
258 return 1;
259 }
260
261 err = convert_fxsr_to_user(to_fp, &fpx);
262 if (err)
263 return 1;
264
265 err |= __put_user(fpx.swd, &to_fp->status);
266 err |= __put_user(X86_FXSR_MAGIC, &to_fp->magic);
267 if (err)
268 return 1;
269
270 if (copy_to_user(&to_fp->_fxsr_env[0], &fpx,
271 sizeof(struct user_fxsr_struct)))
272 return 1;
273 }
274 else {
275 struct user_i387_struct fp;
276
277 err = save_fp_registers(pid, (unsigned long *) &fp);
278 if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
279 return 1;
280 }
281
282 return copy_to_user(to, &sc, sizeof(sc));
283}
284
285static int copy_ucontext_to_user(struct ucontext __user *uc,
286 struct _fpstate __user *fp, sigset_t *set,
287 unsigned long sp)
288{
289 int err = 0;
290
291 err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp);
292 err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags);
293 err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size);
294 err |= copy_sc_to_user(&uc->uc_mcontext, fp, &current->thread.regs, sp);
295 err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set));
296 return err;
297}
298
299struct sigframe
300{
301 char __user *pretcode;
302 int sig;
303 struct sigcontext sc;
304 struct _fpstate fpstate;
305 unsigned long extramask[_NSIG_WORDS-1];
306 char retcode[8];
307};
308
309struct rt_sigframe
310{
311 char __user *pretcode;
312 int sig;
313 struct siginfo __user *pinfo;
314 void __user *puc;
315 struct siginfo info;
316 struct ucontext uc;
317 struct _fpstate fpstate;
318 char retcode[8];
319};
320
321int setup_signal_stack_sc(unsigned long stack_top, int sig,
322 struct k_sigaction *ka, struct pt_regs *regs,
323 sigset_t *mask)
324{
325 struct sigframe __user *frame;
326 void __user *restorer;
327 unsigned long save_sp = PT_REGS_SP(regs);
328 int err = 0;
329
330 /* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */
331 stack_top = ((stack_top + 4) & -16UL) - 4;
332 frame = (struct sigframe __user *) stack_top - 1;
333 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
334 return 1;
335
336 restorer = frame->retcode;
337 if (ka->sa.sa_flags & SA_RESTORER)
338 restorer = ka->sa.sa_restorer;
339
340 /* Update SP now because the page fault handler refuses to extend
341 * the stack if the faulting address is too far below the current
342 * SP, which frame now certainly is. If there's an error, the original
343 * value is restored on the way out.
344 * When writing the sigcontext to the stack, we have to write the
345 * original value, so that's passed to copy_sc_to_user, which does
346 * the right thing with it.
347 */
348 PT_REGS_SP(regs) = (unsigned long) frame;
349
350 err |= __put_user(restorer, &frame->pretcode);
351 err |= __put_user(sig, &frame->sig);
352 err |= copy_sc_to_user(&frame->sc, NULL, regs, save_sp);
353 err |= __put_user(mask->sig[0], &frame->sc.oldmask);
354 if (_NSIG_WORDS > 1)
355 err |= __copy_to_user(&frame->extramask, &mask->sig[1],
356 sizeof(frame->extramask));
357
358 /*
359 * This is popl %eax ; movl $,%eax ; int $0x80
360 *
361 * WE DO NOT USE IT ANY MORE! It's only left here for historical
362 * reasons and because gdb uses it as a signature to notice
363 * signal handler stack frames.
364 */
365 err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
366 err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2));
367 err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
368
369 if (err)
370 goto err;
371
372 PT_REGS_SP(regs) = (unsigned long) frame;
373 PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
374 PT_REGS_EAX(regs) = (unsigned long) sig;
375 PT_REGS_EDX(regs) = (unsigned long) 0;
376 PT_REGS_ECX(regs) = (unsigned long) 0;
377
378 if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
379 ptrace_notify(SIGTRAP);
380 return 0;
381
382err:
383 PT_REGS_SP(regs) = save_sp;
384 return err;
385}
386
387int setup_signal_stack_si(unsigned long stack_top, int sig,
388 struct k_sigaction *ka, struct pt_regs *regs,
389 siginfo_t *info, sigset_t *mask)
390{
391 struct rt_sigframe __user *frame;
392 void __user *restorer;
393 unsigned long save_sp = PT_REGS_SP(regs);
394 int err = 0;
395
396 stack_top &= -8UL;
397 frame = (struct rt_sigframe __user *) stack_top - 1;
398 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
399 return 1;
400
401 restorer = frame->retcode;
402 if (ka->sa.sa_flags & SA_RESTORER)
403 restorer = ka->sa.sa_restorer;
404
405 /* See comment above about why this is here */
406 PT_REGS_SP(regs) = (unsigned long) frame;
407
408 err |= __put_user(restorer, &frame->pretcode);
409 err |= __put_user(sig, &frame->sig);
410 err |= __put_user(&frame->info, &frame->pinfo);
411 err |= __put_user(&frame->uc, &frame->puc);
412 err |= copy_siginfo_to_user(&frame->info, info);
413 err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask,
414 save_sp);
415
416 /*
417 * This is movl $,%eax ; int $0x80
418 *
419 * WE DO NOT USE IT ANY MORE! It's only left here for historical
420 * reasons and because gdb uses it as a signature to notice
421 * signal handler stack frames.
422 */
423 err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
424 err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1));
425 err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
426
427 if (err)
428 goto err;
429
430 PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
431 PT_REGS_EAX(regs) = (unsigned long) sig;
432 PT_REGS_EDX(regs) = (unsigned long) &frame->info;
433 PT_REGS_ECX(regs) = (unsigned long) &frame->uc;
434
435 if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
436 ptrace_notify(SIGTRAP);
437 return 0;
438
439err:
440 PT_REGS_SP(regs) = save_sp;
441 return err;
442}
443
444long sys_sigreturn(struct pt_regs regs)
445{
446 unsigned long sp = PT_REGS_SP(&current->thread.regs);
447 struct sigframe __user *frame = (struct sigframe __user *)(sp - 8);
448 sigset_t set;
449 struct sigcontext __user *sc = &frame->sc;
450 unsigned long __user *oldmask = &sc->oldmask;
451 unsigned long __user *extramask = frame->extramask;
452 int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long);
453
454 if (copy_from_user(&set.sig[0], oldmask, sizeof(set.sig[0])) ||
455 copy_from_user(&set.sig[1], extramask, sig_size))
456 goto segfault;
457
458 sigdelsetmask(&set, ~_BLOCKABLE);
459 set_current_blocked(&set);
460
461 if (copy_sc_from_user(&current->thread.regs, sc))
462 goto segfault;
463
464 /* Avoid ERESTART handling */
465 PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
466 return PT_REGS_SYSCALL_RET(&current->thread.regs);
467
468 segfault:
469 force_sig(SIGSEGV, current);
470 return 0;
471}
472
473long sys_rt_sigreturn(struct pt_regs regs)
474{
475 unsigned long sp = PT_REGS_SP(&current->thread.regs);
476 struct rt_sigframe __user *frame =
477 (struct rt_sigframe __user *) (sp - 4);
478 sigset_t set;
479 struct ucontext __user *uc = &frame->uc;
480 int sig_size = _NSIG_WORDS * sizeof(unsigned long);
481
482 if (copy_from_user(&set, &uc->uc_sigmask, sig_size))
483 goto segfault;
484
485 sigdelsetmask(&set, ~_BLOCKABLE);
486 set_current_blocked(&set);
487
488 if (copy_sc_from_user(&current->thread.regs, &uc->uc_mcontext))
489 goto segfault;
490
491 /* Avoid ERESTART handling */
492 PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
493 return PT_REGS_SYSCALL_RET(&current->thread.regs);
494
495 segfault:
496 force_sig(SIGSEGV, current);
497 return 0;
498}
diff --git a/arch/um/sys-x86/signal_64.c b/arch/um/sys-x86/signal_64.c
new file mode 100644
index 000000000000..255b2ca0ce67
--- /dev/null
+++ b/arch/um/sys-x86/signal_64.c
@@ -0,0 +1,255 @@
1/*
2 * Copyright (C) 2003 PathScale, Inc.
3 * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 * Licensed under the GPL
5 */
6
7#include <linux/personality.h>
8#include <linux/ptrace.h>
9#include <linux/kernel.h>
10#include <asm/unistd.h>
11#include <asm/uaccess.h>
12#include <asm/ucontext.h>
13#include "frame_kern.h"
14#include "skas.h"
15
16static int copy_sc_from_user(struct pt_regs *regs,
17 struct sigcontext __user *from)
18{
19 struct sigcontext sc;
20 struct user_i387_struct fp;
21 void __user *buf;
22 int err;
23
24 err = copy_from_user(&sc, from, sizeof(sc));
25 if (err)
26 return err;
27
28#define GETREG(regno, regname) regs->regs.gp[HOST_##regno] = sc.regname
29
30 GETREG(R8, r8);
31 GETREG(R9, r9);
32 GETREG(R10, r10);
33 GETREG(R11, r11);
34 GETREG(R12, r12);
35 GETREG(R13, r13);
36 GETREG(R14, r14);
37 GETREG(R15, r15);
38 GETREG(RDI, di);
39 GETREG(RSI, si);
40 GETREG(RBP, bp);
41 GETREG(RBX, bx);
42 GETREG(RDX, dx);
43 GETREG(RAX, ax);
44 GETREG(RCX, cx);
45 GETREG(SP, sp);
46 GETREG(IP, ip);
47 GETREG(EFLAGS, flags);
48 GETREG(CS, cs);
49#undef GETREG
50
51 buf = sc.fpstate;
52
53 err = copy_from_user(&fp, buf, sizeof(struct user_i387_struct));
54 if (err)
55 return 1;
56
57 err = restore_fp_registers(userspace_pid[current_thread_info()->cpu],
58 (unsigned long *) &fp);
59 if (err < 0) {
60 printk(KERN_ERR "copy_sc_from_user - "
61 "restore_fp_registers failed, errno = %d\n",
62 -err);
63 return 1;
64 }
65
66 return 0;
67}
68
69static int copy_sc_to_user(struct sigcontext __user *to,
70 struct _fpstate __user *to_fp, struct pt_regs *regs,
71 unsigned long mask, unsigned long sp)
72{
73 struct faultinfo * fi = &current->thread.arch.faultinfo;
74 struct sigcontext sc;
75 struct user_i387_struct fp;
76 int err = 0;
77 memset(&sc, 0, sizeof(struct sigcontext));
78
79#define PUTREG(regno, regname) sc.regname = regs->regs.gp[HOST_##regno]
80
81 PUTREG(RDI, di);
82 PUTREG(RSI, si);
83 PUTREG(RBP, bp);
84 /*
85 * Must use original RSP, which is passed in, rather than what's in
86 * signal frame.
87 */
88 sc.sp = sp;
89 PUTREG(RBX, bx);
90 PUTREG(RDX, dx);
91 PUTREG(RCX, cx);
92 PUTREG(RAX, ax);
93 PUTREG(R8, r8);
94 PUTREG(R9, r9);
95 PUTREG(R10, r10);
96 PUTREG(R11, r11);
97 PUTREG(R12, r12);
98 PUTREG(R13, r13);
99 PUTREG(R14, r14);
100 PUTREG(R15, r15);
101 PUTREG(CS, cs); /* XXX x86_64 doesn't do this */
102
103 sc.cr2 = fi->cr2;
104 sc.err = fi->error_code;
105 sc.trapno = fi->trap_no;
106
107 PUTREG(IP, ip);
108 PUTREG(EFLAGS, flags);
109#undef PUTREG
110
111 sc.oldmask = mask;
112
113 err = copy_to_user(to, &sc, sizeof(struct sigcontext));
114 if (err)
115 return 1;
116
117 err = save_fp_registers(userspace_pid[current_thread_info()->cpu],
118 (unsigned long *) &fp);
119 if (err < 0) {
120 printk(KERN_ERR "copy_sc_from_user - restore_fp_registers "
121 "failed, errno = %d\n", -err);
122 return 1;
123 }
124
125 if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
126 return 1;
127
128 return err;
129}
130
131struct rt_sigframe
132{
133 char __user *pretcode;
134 struct ucontext uc;
135 struct siginfo info;
136 struct _fpstate fpstate;
137};
138
139int setup_signal_stack_si(unsigned long stack_top, int sig,
140 struct k_sigaction *ka, struct pt_regs * regs,
141 siginfo_t *info, sigset_t *set)
142{
143 struct rt_sigframe __user *frame;
144 unsigned long save_sp = PT_REGS_RSP(regs);
145 int err = 0;
146 struct task_struct *me = current;
147
148 frame = (struct rt_sigframe __user *)
149 round_down(stack_top - sizeof(struct rt_sigframe), 16);
150 /* Subtract 128 for a red zone and 8 for proper alignment */
151 frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8);
152
153 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
154 goto out;
155
156 if (ka->sa.sa_flags & SA_SIGINFO) {
157 err |= copy_siginfo_to_user(&frame->info, info);
158 if (err)
159 goto out;
160 }
161
162 /*
163 * Update SP now because the page fault handler refuses to extend
164 * the stack if the faulting address is too far below the current
165 * SP, which frame now certainly is. If there's an error, the original
166 * value is restored on the way out.
167 * When writing the sigcontext to the stack, we have to write the
168 * original value, so that's passed to copy_sc_to_user, which does
169 * the right thing with it.
170 */
171 PT_REGS_RSP(regs) = (unsigned long) frame;
172
173 /* Create the ucontext. */
174 err |= __put_user(0, &frame->uc.uc_flags);
175 err |= __put_user(0, &frame->uc.uc_link);
176 err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
177 err |= __put_user(sas_ss_flags(save_sp),
178 &frame->uc.uc_stack.ss_flags);
179 err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
180 err |= copy_sc_to_user(&frame->uc.uc_mcontext, &frame->fpstate, regs,
181 set->sig[0], save_sp);
182 err |= __put_user(&frame->fpstate, &frame->uc.uc_mcontext.fpstate);
183 if (sizeof(*set) == 16) {
184 __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
185 __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]);
186 }
187 else
188 err |= __copy_to_user(&frame->uc.uc_sigmask, set,
189 sizeof(*set));
190
191 /*
192 * Set up to return from userspace. If provided, use a stub
193 * already in userspace.
194 */
195 /* x86-64 should always use SA_RESTORER. */
196 if (ka->sa.sa_flags & SA_RESTORER)
197 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
198 else
199 /* could use a vstub here */
200 goto restore_sp;
201
202 if (err)
203 goto restore_sp;
204
205 /* Set up registers for signal handler */
206 {
207 struct exec_domain *ed = current_thread_info()->exec_domain;
208 if (unlikely(ed && ed->signal_invmap && sig < 32))
209 sig = ed->signal_invmap[sig];
210 }
211
212 PT_REGS_RDI(regs) = sig;
213 /* In case the signal handler was declared without prototypes */
214 PT_REGS_RAX(regs) = 0;
215
216 /*
217 * This also works for non SA_SIGINFO handlers because they expect the
218 * next argument after the signal number on the stack.
219 */
220 PT_REGS_RSI(regs) = (unsigned long) &frame->info;
221 PT_REGS_RDX(regs) = (unsigned long) &frame->uc;
222 PT_REGS_RIP(regs) = (unsigned long) ka->sa.sa_handler;
223 out:
224 return err;
225
226restore_sp:
227 PT_REGS_RSP(regs) = save_sp;
228 return err;
229}
230
231long sys_rt_sigreturn(struct pt_regs *regs)
232{
233 unsigned long sp = PT_REGS_SP(&current->thread.regs);
234 struct rt_sigframe __user *frame =
235 (struct rt_sigframe __user *)(sp - 8);
236 struct ucontext __user *uc = &frame->uc;
237 sigset_t set;
238
239 if (copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
240 goto segfault;
241
242 sigdelsetmask(&set, ~_BLOCKABLE);
243 set_current_blocked(&set);
244
245 if (copy_sc_from_user(&current->thread.regs, &uc->uc_mcontext))
246 goto segfault;
247
248 /* Avoid ERESTART handling */
249 PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
250 return PT_REGS_SYSCALL_RET(&current->thread.regs);
251
252 segfault:
253 force_sig(SIGSEGV, current);
254 return 0;
255}
diff --git a/arch/um/sys-x86/stub_32.S b/arch/um/sys-x86/stub_32.S
new file mode 100644
index 000000000000..54a36ec20cb7
--- /dev/null
+++ b/arch/um/sys-x86/stub_32.S
@@ -0,0 +1,51 @@
1#include "as-layout.h"
2
3 .globl syscall_stub
4.section .__syscall_stub, "ax"
5
6 .globl batch_syscall_stub
7batch_syscall_stub:
8 /* load pointer to first operation */
9 mov $(STUB_DATA+8), %esp
10
11again:
12 /* load length of additional data */
13 mov 0x0(%esp), %eax
14
15 /* if(length == 0) : end of list */
16 /* write possible 0 to header */
17 mov %eax, STUB_DATA+4
18 cmpl $0, %eax
19 jz done
20
21 /* save current pointer */
22 mov %esp, STUB_DATA+4
23
24 /* skip additional data */
25 add %eax, %esp
26
27 /* load syscall-# */
28 pop %eax
29
30 /* load syscall params */
31 pop %ebx
32 pop %ecx
33 pop %edx
34 pop %esi
35 pop %edi
36 pop %ebp
37
38 /* execute syscall */
39 int $0x80
40
41 /* check return value */
42 pop %ebx
43 cmp %ebx, %eax
44 je again
45
46done:
47 /* save return value */
48 mov %eax, STUB_DATA
49
50 /* stop */
51 int3
diff --git a/arch/um/sys-x86/stub_64.S b/arch/um/sys-x86/stub_64.S
new file mode 100644
index 000000000000..20e4a96a6dcb
--- /dev/null
+++ b/arch/um/sys-x86/stub_64.S
@@ -0,0 +1,66 @@
1#include "as-layout.h"
2
3 .globl syscall_stub
4.section .__syscall_stub, "ax"
5syscall_stub:
6 syscall
7 /* We don't have 64-bit constants, so this constructs the address
8 * we need.
9 */
10 movq $(STUB_DATA >> 32), %rbx
11 salq $32, %rbx
12 movq $(STUB_DATA & 0xffffffff), %rcx
13 or %rcx, %rbx
14 movq %rax, (%rbx)
15 int3
16
17 .globl batch_syscall_stub
18batch_syscall_stub:
19 mov $(STUB_DATA >> 32), %rbx
20 sal $32, %rbx
21 mov $(STUB_DATA & 0xffffffff), %rax
22 or %rax, %rbx
23 /* load pointer to first operation */
24 mov %rbx, %rsp
25 add $0x10, %rsp
26again:
27 /* load length of additional data */
28 mov 0x0(%rsp), %rax
29
30 /* if(length == 0) : end of list */
31 /* write possible 0 to header */
32 mov %rax, 8(%rbx)
33 cmp $0, %rax
34 jz done
35
36 /* save current pointer */
37 mov %rsp, 8(%rbx)
38
39 /* skip additional data */
40 add %rax, %rsp
41
42 /* load syscall-# */
43 pop %rax
44
45 /* load syscall params */
46 pop %rdi
47 pop %rsi
48 pop %rdx
49 pop %r10
50 pop %r8
51 pop %r9
52
53 /* execute syscall */
54 syscall
55
56 /* check return value */
57 pop %rcx
58 cmp %rcx, %rax
59 je again
60
61done:
62 /* save return value */
63 mov %rax, (%rbx)
64
65 /* stop */
66 int3
diff --git a/arch/um/sys-x86/stub_segv_32.c b/arch/um/sys-x86/stub_segv_32.c
new file mode 100644
index 000000000000..28ccf737a79f
--- /dev/null
+++ b/arch/um/sys-x86/stub_segv_32.c
@@ -0,0 +1,17 @@
1/*
2 * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include "sysdep/stub.h"
7#include "sysdep/sigcontext.h"
8
9void __attribute__ ((__section__ (".__syscall_stub")))
10stub_segv_handler(int sig)
11{
12 struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
13
14 GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA), sc);
15
16 trap_myself();
17}
diff --git a/arch/um/sys-x86/stub_segv_64.c b/arch/um/sys-x86/stub_segv_64.c
new file mode 100644
index 000000000000..ced051afc705
--- /dev/null
+++ b/arch/um/sys-x86/stub_segv_64.c
@@ -0,0 +1,22 @@
1/*
2 * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <signal.h>
7#include "as-layout.h"
8#include "sysdep/stub.h"
9#include "sysdep/faultinfo.h"
10#include "sysdep/sigcontext.h"
11
12void __attribute__ ((__section__ (".__syscall_stub")))
13stub_segv_handler(int sig)
14{
15 struct ucontext *uc;
16
17 __asm__ __volatile__("movq %%rdx, %0" : "=g" (uc) :);
18 GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA),
19 &uc->uc_mcontext);
20 trap_myself();
21}
22
diff --git a/arch/um/sys-x86/sys_call_table_32.S b/arch/um/sys-x86/sys_call_table_32.S
new file mode 100644
index 000000000000..de274071455d
--- /dev/null
+++ b/arch/um/sys-x86/sys_call_table_32.S
@@ -0,0 +1,28 @@
1#include <linux/linkage.h>
2/* Steal i386 syscall table for our purposes, but with some slight changes.*/
3
4#define sys_iopl sys_ni_syscall
5#define sys_ioperm sys_ni_syscall
6
7#define sys_vm86old sys_ni_syscall
8#define sys_vm86 sys_ni_syscall
9
10#define old_mmap sys_old_mmap
11
12#define ptregs_fork sys_fork
13#define ptregs_execve sys_execve
14#define ptregs_iopl sys_iopl
15#define ptregs_vm86old sys_vm86old
16#define ptregs_sigreturn sys_sigreturn
17#define ptregs_clone sys_clone
18#define ptregs_vm86 sys_vm86
19#define ptregs_rt_sigreturn sys_rt_sigreturn
20#define ptregs_sigaltstack sys_sigaltstack
21#define ptregs_vfork sys_vfork
22
23.section .rodata,"a"
24
25#include "../../x86/kernel/syscall_table_32.S"
26
27ENTRY(syscall_table_size)
28.long .-sys_call_table
diff --git a/arch/um/sys-x86/sys_call_table_64.c b/arch/um/sys-x86/sys_call_table_64.c
new file mode 100644
index 000000000000..f46de82d675c
--- /dev/null
+++ b/arch/um/sys-x86/sys_call_table_64.c
@@ -0,0 +1,64 @@
1/*
2 * System call table for UML/x86-64, copied from arch/x86_64/kernel/syscall.c
3 * with some changes for UML.
4 */
5
6#include <linux/linkage.h>
7#include <linux/sys.h>
8#include <linux/cache.h>
9
10#define __NO_STUBS
11
12/*
13 * Below you can see, in terms of #define's, the differences between the x86-64
14 * and the UML syscall table.
15 */
16
17/* Not going to be implemented by UML, since we have no hardware. */
18#define stub_iopl sys_ni_syscall
19#define sys_ioperm sys_ni_syscall
20
21/*
22 * The UML TLS problem. Note that x86_64 does not implement this, so the below
23 * is needed only for the ia32 compatibility.
24 */
25
26/* On UML we call it this way ("old" means it's not mmap2) */
27#define sys_mmap old_mmap
28
29#define stub_clone sys_clone
30#define stub_fork sys_fork
31#define stub_vfork sys_vfork
32#define stub_execve sys_execve
33#define stub_rt_sigsuspend sys_rt_sigsuspend
34#define stub_sigaltstack sys_sigaltstack
35#define stub_rt_sigreturn sys_rt_sigreturn
36
37#define __SYSCALL(nr, sym) extern asmlinkage void sym(void) ;
38#undef _ASM_X86_UNISTD_64_H
39#include "../../x86/include/asm/unistd_64.h"
40
41#undef __SYSCALL
42#define __SYSCALL(nr, sym) [ nr ] = sym,
43#undef _ASM_X86_UNISTD_64_H
44
45typedef void (*sys_call_ptr_t)(void);
46
47extern void sys_ni_syscall(void);
48
49/*
50 * We used to have a trick here which made sure that holes in the
51 * x86_64 table were filled in with sys_ni_syscall, but a comment in
52 * unistd_64.h says that holes aren't allowed, so the trick was
53 * removed.
54 * The trick looked like this
55 * [0 ... UM_NR_syscall_max] = &sys_ni_syscall
56 * before including unistd_64.h - the later initializations overwrote
57 * the sys_ni_syscall filler.
58 */
59
60sys_call_ptr_t sys_call_table[] __cacheline_aligned = {
61#include "../../x86/include/asm/unistd_64.h"
62};
63
64int syscall_table_size = sizeof(sys_call_table);
diff --git a/arch/um/sys-x86/syscalls_32.c b/arch/um/sys-x86/syscalls_32.c
new file mode 100644
index 000000000000..70ca357393b8
--- /dev/null
+++ b/arch/um/sys-x86/syscalls_32.c
@@ -0,0 +1,66 @@
1/*
2 * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/sched.h"
7#include "linux/shm.h"
8#include "linux/ipc.h"
9#include "linux/syscalls.h"
10#include "asm/mman.h"
11#include "asm/uaccess.h"
12#include "asm/unistd.h"
13
14/*
15 * The prototype on i386 is:
16 *
17 * int clone(int flags, void * child_stack, int * parent_tidptr, struct user_desc * newtls, int * child_tidptr)
18 *
19 * and the "newtls" arg. on i386 is read by copy_thread directly from the
20 * register saved on the stack.
21 */
22long sys_clone(unsigned long clone_flags, unsigned long newsp,
23 int __user *parent_tid, void *newtls, int __user *child_tid)
24{
25 long ret;
26
27 if (!newsp)
28 newsp = UPT_SP(&current->thread.regs.regs);
29
30 current->thread.forking = 1;
31 ret = do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
32 child_tid);
33 current->thread.forking = 0;
34 return ret;
35}
36
37long sys_sigaction(int sig, const struct old_sigaction __user *act,
38 struct old_sigaction __user *oact)
39{
40 struct k_sigaction new_ka, old_ka;
41 int ret;
42
43 if (act) {
44 old_sigset_t mask;
45 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
46 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
47 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
48 return -EFAULT;
49 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
50 __get_user(mask, &act->sa_mask);
51 siginitset(&new_ka.sa.sa_mask, mask);
52 }
53
54 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
55
56 if (!ret && oact) {
57 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
58 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
59 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
60 return -EFAULT;
61 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
62 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
63 }
64
65 return ret;
66}
diff --git a/arch/um/sys-x86/syscalls_64.c b/arch/um/sys-x86/syscalls_64.c
new file mode 100644
index 000000000000..f3d82bb6e15a
--- /dev/null
+++ b/arch/um/sys-x86/syscalls_64.c
@@ -0,0 +1,102 @@
1/*
2 * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Copyright 2003 PathScale, Inc.
4 *
5 * Licensed under the GPL
6 */
7
8#include "linux/linkage.h"
9#include "linux/personality.h"
10#include "linux/utsname.h"
11#include "asm/prctl.h" /* XXX This should get the constants from libc */
12#include "asm/uaccess.h"
13#include "os.h"
14
15long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr)
16{
17 unsigned long *ptr = addr, tmp;
18 long ret;
19 int pid = task->mm->context.id.u.pid;
20
21 /*
22 * With ARCH_SET_FS (and ARCH_SET_GS is treated similarly to
23 * be safe), we need to call arch_prctl on the host because
24 * setting %fs may result in something else happening (like a
25 * GDT or thread.fs being set instead). So, we let the host
26 * fiddle the registers and thread struct and restore the
27 * registers afterwards.
28 *
29 * So, the saved registers are stored to the process (this
30 * needed because a stub may have been the last thing to run),
31 * arch_prctl is run on the host, then the registers are read
32 * back.
33 */
34 switch (code) {
35 case ARCH_SET_FS:
36 case ARCH_SET_GS:
37 ret = restore_registers(pid, &current->thread.regs.regs);
38 if (ret)
39 return ret;
40 break;
41 case ARCH_GET_FS:
42 case ARCH_GET_GS:
43 /*
44 * With these two, we read to a local pointer and
45 * put_user it to the userspace pointer that we were
46 * given. If addr isn't valid (because it hasn't been
47 * faulted in or is just bogus), we want put_user to
48 * fault it in (or return -EFAULT) instead of having
49 * the host return -EFAULT.
50 */
51 ptr = &tmp;
52 }
53
54 ret = os_arch_prctl(pid, code, ptr);
55 if (ret)
56 return ret;
57
58 switch (code) {
59 case ARCH_SET_FS:
60 current->thread.arch.fs = (unsigned long) ptr;
61 ret = save_registers(pid, &current->thread.regs.regs);
62 break;
63 case ARCH_SET_GS:
64 ret = save_registers(pid, &current->thread.regs.regs);
65 break;
66 case ARCH_GET_FS:
67 ret = put_user(tmp, addr);
68 break;
69 case ARCH_GET_GS:
70 ret = put_user(tmp, addr);
71 break;
72 }
73
74 return ret;
75}
76
77long sys_arch_prctl(int code, unsigned long addr)
78{
79 return arch_prctl(current, code, (unsigned long __user *) addr);
80}
81
82long sys_clone(unsigned long clone_flags, unsigned long newsp,
83 void __user *parent_tid, void __user *child_tid)
84{
85 long ret;
86
87 if (!newsp)
88 newsp = UPT_SP(&current->thread.regs.regs);
89 current->thread.forking = 1;
90 ret = do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
91 child_tid);
92 current->thread.forking = 0;
93 return ret;
94}
95
96void arch_switch_to(struct task_struct *to)
97{
98 if ((to->thread.arch.fs == 0) || (to->mm == NULL))
99 return;
100
101 arch_prctl(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs);
102}
diff --git a/arch/um/sys-x86/sysrq_32.c b/arch/um/sys-x86/sysrq_32.c
new file mode 100644
index 000000000000..171b3e9dc867
--- /dev/null
+++ b/arch/um/sys-x86/sysrq_32.c
@@ -0,0 +1,101 @@
1/*
2 * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/kernel.h"
7#include "linux/smp.h"
8#include "linux/sched.h"
9#include "linux/kallsyms.h"
10#include "asm/ptrace.h"
11#include "sysrq.h"
12
13/* This is declared by <linux/sched.h> */
14void show_regs(struct pt_regs *regs)
15{
16 printk("\n");
17 printk("EIP: %04lx:[<%08lx>] CPU: %d %s",
18 0xffff & PT_REGS_CS(regs), PT_REGS_IP(regs),
19 smp_processor_id(), print_tainted());
20 if (PT_REGS_CS(regs) & 3)
21 printk(" ESP: %04lx:%08lx", 0xffff & PT_REGS_SS(regs),
22 PT_REGS_SP(regs));
23 printk(" EFLAGS: %08lx\n %s\n", PT_REGS_EFLAGS(regs),
24 print_tainted());
25 printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
26 PT_REGS_EAX(regs), PT_REGS_EBX(regs),
27 PT_REGS_ECX(regs),
28 PT_REGS_EDX(regs));
29 printk("ESI: %08lx EDI: %08lx EBP: %08lx",
30 PT_REGS_ESI(regs), PT_REGS_EDI(regs),
31 PT_REGS_EBP(regs));
32 printk(" DS: %04lx ES: %04lx\n",
33 0xffff & PT_REGS_DS(regs),
34 0xffff & PT_REGS_ES(regs));
35
36 show_trace(NULL, (unsigned long *) &regs);
37}
38
39/* Copied from i386. */
40static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
41{
42 return p > (void *)tinfo &&
43 p < (void *)tinfo + THREAD_SIZE - 3;
44}
45
46/* Adapted from i386 (we also print the address we read from). */
47static inline unsigned long print_context_stack(struct thread_info *tinfo,
48 unsigned long *stack, unsigned long ebp)
49{
50 unsigned long addr;
51
52#ifdef CONFIG_FRAME_POINTER
53 while (valid_stack_ptr(tinfo, (void *)ebp)) {
54 addr = *(unsigned long *)(ebp + 4);
55 printk("%08lx: [<%08lx>]", ebp + 4, addr);
56 print_symbol(" %s", addr);
57 printk("\n");
58 ebp = *(unsigned long *)ebp;
59 }
60#else
61 while (valid_stack_ptr(tinfo, stack)) {
62 addr = *stack;
63 if (__kernel_text_address(addr)) {
64 printk("%08lx: [<%08lx>]", (unsigned long) stack, addr);
65 print_symbol(" %s", addr);
66 printk("\n");
67 }
68 stack++;
69 }
70#endif
71 return ebp;
72}
73
74void show_trace(struct task_struct* task, unsigned long * stack)
75{
76 unsigned long ebp;
77 struct thread_info *context;
78
79 /* Turn this into BUG_ON if possible. */
80 if (!stack) {
81 stack = (unsigned long*) &stack;
82 printk("show_trace: got NULL stack, implicit assumption task == current");
83 WARN_ON(1);
84 }
85
86 if (!task)
87 task = current;
88
89 if (task != current) {
90 ebp = (unsigned long) KSTK_EBP(task);
91 } else {
92 asm ("movl %%ebp, %0" : "=r" (ebp) : );
93 }
94
95 context = (struct thread_info *)
96 ((unsigned long)stack & (~(THREAD_SIZE - 1)));
97 print_context_stack(context, stack, ebp);
98
99 printk("\n");
100}
101
diff --git a/arch/um/sys-x86/sysrq_64.c b/arch/um/sys-x86/sysrq_64.c
new file mode 100644
index 000000000000..f4f82beb3508
--- /dev/null
+++ b/arch/um/sys-x86/sysrq_64.c
@@ -0,0 +1,41 @@
1/*
2 * Copyright 2003 PathScale, Inc.
3 *
4 * Licensed under the GPL
5 */
6
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/sched.h>
10#include <linux/utsname.h>
11#include <asm/current.h>
12#include <asm/ptrace.h>
13#include "sysrq.h"
14
15void __show_regs(struct pt_regs *regs)
16{
17 printk("\n");
18 print_modules();
19 printk(KERN_INFO "Pid: %d, comm: %.20s %s %s\n", task_pid_nr(current),
20 current->comm, print_tainted(), init_utsname()->release);
21 printk(KERN_INFO "RIP: %04lx:[<%016lx>]\n", PT_REGS_CS(regs) & 0xffff,
22 PT_REGS_RIP(regs));
23 printk(KERN_INFO "RSP: %016lx EFLAGS: %08lx\n", PT_REGS_RSP(regs),
24 PT_REGS_EFLAGS(regs));
25 printk(KERN_INFO "RAX: %016lx RBX: %016lx RCX: %016lx\n",
26 PT_REGS_RAX(regs), PT_REGS_RBX(regs), PT_REGS_RCX(regs));
27 printk(KERN_INFO "RDX: %016lx RSI: %016lx RDI: %016lx\n",
28 PT_REGS_RDX(regs), PT_REGS_RSI(regs), PT_REGS_RDI(regs));
29 printk(KERN_INFO "RBP: %016lx R08: %016lx R09: %016lx\n",
30 PT_REGS_RBP(regs), PT_REGS_R8(regs), PT_REGS_R9(regs));
31 printk(KERN_INFO "R10: %016lx R11: %016lx R12: %016lx\n",
32 PT_REGS_R10(regs), PT_REGS_R11(regs), PT_REGS_R12(regs));
33 printk(KERN_INFO "R13: %016lx R14: %016lx R15: %016lx\n",
34 PT_REGS_R13(regs), PT_REGS_R14(regs), PT_REGS_R15(regs));
35}
36
37void show_regs(struct pt_regs *regs)
38{
39 __show_regs(regs);
40 show_trace(current, (unsigned long *) &regs);
41}
diff --git a/arch/um/sys-x86/tls_32.c b/arch/um/sys-x86/tls_32.c
new file mode 100644
index 000000000000..c6c7131e563b
--- /dev/null
+++ b/arch/um/sys-x86/tls_32.c
@@ -0,0 +1,396 @@
1/*
2 * Copyright (C) 2005 Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
3 * Licensed under the GPL
4 */
5
6#include "linux/percpu.h"
7#include "linux/sched.h"
8#include "asm/uaccess.h"
9#include "os.h"
10#include "skas.h"
11#include "sysdep/tls.h"
12
13/*
14 * If needed we can detect when it's uninitialized.
15 *
16 * These are initialized in an initcall and unchanged thereafter.
17 */
18static int host_supports_tls = -1;
19int host_gdt_entry_tls_min;
20
21int do_set_thread_area(struct user_desc *info)
22{
23 int ret;
24 u32 cpu;
25
26 cpu = get_cpu();
27 ret = os_set_thread_area(info, userspace_pid[cpu]);
28 put_cpu();
29
30 if (ret)
31 printk(KERN_ERR "PTRACE_SET_THREAD_AREA failed, err = %d, "
32 "index = %d\n", ret, info->entry_number);
33
34 return ret;
35}
36
37int do_get_thread_area(struct user_desc *info)
38{
39 int ret;
40 u32 cpu;
41
42 cpu = get_cpu();
43 ret = os_get_thread_area(info, userspace_pid[cpu]);
44 put_cpu();
45
46 if (ret)
47 printk(KERN_ERR "PTRACE_GET_THREAD_AREA failed, err = %d, "
48 "index = %d\n", ret, info->entry_number);
49
50 return ret;
51}
52
53/*
54 * sys_get_thread_area: get a yet unused TLS descriptor index.
55 * XXX: Consider leaving one free slot for glibc usage at first place. This must
56 * be done here (and by changing GDT_ENTRY_TLS_* macros) and nowhere else.
57 *
58 * Also, this must be tested when compiling in SKAS mode with dynamic linking
59 * and running against NPTL.
60 */
61static int get_free_idx(struct task_struct* task)
62{
63 struct thread_struct *t = &task->thread;
64 int idx;
65
66 if (!t->arch.tls_array)
67 return GDT_ENTRY_TLS_MIN;
68
69 for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++)
70 if (!t->arch.tls_array[idx].present)
71 return idx + GDT_ENTRY_TLS_MIN;
72 return -ESRCH;
73}
74
75static inline void clear_user_desc(struct user_desc* info)
76{
77 /* Postcondition: LDT_empty(info) returns true. */
78 memset(info, 0, sizeof(*info));
79
80 /*
81 * Check the LDT_empty or the i386 sys_get_thread_area code - we obtain
82 * indeed an empty user_desc.
83 */
84 info->read_exec_only = 1;
85 info->seg_not_present = 1;
86}
87
88#define O_FORCE 1
89
90static int load_TLS(int flags, struct task_struct *to)
91{
92 int ret = 0;
93 int idx;
94
95 for (idx = GDT_ENTRY_TLS_MIN; idx < GDT_ENTRY_TLS_MAX; idx++) {
96 struct uml_tls_struct* curr =
97 &to->thread.arch.tls_array[idx - GDT_ENTRY_TLS_MIN];
98
99 /*
100 * Actually, now if it wasn't flushed it gets cleared and
101 * flushed to the host, which will clear it.
102 */
103 if (!curr->present) {
104 if (!curr->flushed) {
105 clear_user_desc(&curr->tls);
106 curr->tls.entry_number = idx;
107 } else {
108 WARN_ON(!LDT_empty(&curr->tls));
109 continue;
110 }
111 }
112
113 if (!(flags & O_FORCE) && curr->flushed)
114 continue;
115
116 ret = do_set_thread_area(&curr->tls);
117 if (ret)
118 goto out;
119
120 curr->flushed = 1;
121 }
122out:
123 return ret;
124}
125
126/*
127 * Verify if we need to do a flush for the new process, i.e. if there are any
128 * present desc's, only if they haven't been flushed.
129 */
130static inline int needs_TLS_update(struct task_struct *task)
131{
132 int i;
133 int ret = 0;
134
135 for (i = GDT_ENTRY_TLS_MIN; i < GDT_ENTRY_TLS_MAX; i++) {
136 struct uml_tls_struct* curr =
137 &task->thread.arch.tls_array[i - GDT_ENTRY_TLS_MIN];
138
139 /*
140 * Can't test curr->present, we may need to clear a descriptor
141 * which had a value.
142 */
143 if (curr->flushed)
144 continue;
145 ret = 1;
146 break;
147 }
148 return ret;
149}
150
151/*
152 * On a newly forked process, the TLS descriptors haven't yet been flushed. So
153 * we mark them as such and the first switch_to will do the job.
154 */
155void clear_flushed_tls(struct task_struct *task)
156{
157 int i;
158
159 for (i = GDT_ENTRY_TLS_MIN; i < GDT_ENTRY_TLS_MAX; i++) {
160 struct uml_tls_struct* curr =
161 &task->thread.arch.tls_array[i - GDT_ENTRY_TLS_MIN];
162
163 /*
164 * Still correct to do this, if it wasn't present on the host it
165 * will remain as flushed as it was.
166 */
167 if (!curr->present)
168 continue;
169
170 curr->flushed = 0;
171 }
172}
173
174/*
175 * In SKAS0 mode, currently, multiple guest threads sharing the same ->mm have a
176 * common host process. So this is needed in SKAS0 too.
177 *
178 * However, if each thread had a different host process (and this was discussed
179 * for SMP support) this won't be needed.
180 *
181 * And this will not need be used when (and if) we'll add support to the host
182 * SKAS patch.
183 */
184
185int arch_switch_tls(struct task_struct *to)
186{
187 if (!host_supports_tls)
188 return 0;
189
190 /*
191 * We have no need whatsoever to switch TLS for kernel threads; beyond
192 * that, that would also result in us calling os_set_thread_area with
193 * userspace_pid[cpu] == 0, which gives an error.
194 */
195 if (likely(to->mm))
196 return load_TLS(O_FORCE, to);
197
198 return 0;
199}
200
201static int set_tls_entry(struct task_struct* task, struct user_desc *info,
202 int idx, int flushed)
203{
204 struct thread_struct *t = &task->thread;
205
206 if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
207 return -EINVAL;
208
209 t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].tls = *info;
210 t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].present = 1;
211 t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].flushed = flushed;
212
213 return 0;
214}
215
216int arch_copy_tls(struct task_struct *new)
217{
218 struct user_desc info;
219 int idx, ret = -EFAULT;
220
221 if (copy_from_user(&info,
222 (void __user *) UPT_ESI(&new->thread.regs.regs),
223 sizeof(info)))
224 goto out;
225
226 ret = -EINVAL;
227 if (LDT_empty(&info))
228 goto out;
229
230 idx = info.entry_number;
231
232 ret = set_tls_entry(new, &info, idx, 0);
233out:
234 return ret;
235}
236
237/* XXX: use do_get_thread_area to read the host value? I'm not at all sure! */
238static int get_tls_entry(struct task_struct *task, struct user_desc *info,
239 int idx)
240{
241 struct thread_struct *t = &task->thread;
242
243 if (!t->arch.tls_array)
244 goto clear;
245
246 if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
247 return -EINVAL;
248
249 if (!t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].present)
250 goto clear;
251
252 *info = t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].tls;
253
254out:
255 /*
256 * Temporary debugging check, to make sure that things have been
257 * flushed. This could be triggered if load_TLS() failed.
258 */
259 if (unlikely(task == current &&
260 !t->arch.tls_array[idx - GDT_ENTRY_TLS_MIN].flushed)) {
261 printk(KERN_ERR "get_tls_entry: task with pid %d got here "
262 "without flushed TLS.", current->pid);
263 }
264
265 return 0;
266clear:
267 /*
268 * When the TLS entry has not been set, the values read to user in the
269 * tls_array are 0 (because it's cleared at boot, see
270 * arch/i386/kernel/head.S:cpu_gdt_table). Emulate that.
271 */
272 clear_user_desc(info);
273 info->entry_number = idx;
274 goto out;
275}
276
277int sys_set_thread_area(struct user_desc __user *user_desc)
278{
279 struct user_desc info;
280 int idx, ret;
281
282 if (!host_supports_tls)
283 return -ENOSYS;
284
285 if (copy_from_user(&info, user_desc, sizeof(info)))
286 return -EFAULT;
287
288 idx = info.entry_number;
289
290 if (idx == -1) {
291 idx = get_free_idx(current);
292 if (idx < 0)
293 return idx;
294 info.entry_number = idx;
295 /* Tell the user which slot we chose for him.*/
296 if (put_user(idx, &user_desc->entry_number))
297 return -EFAULT;
298 }
299
300 ret = do_set_thread_area(&info);
301 if (ret)
302 return ret;
303 return set_tls_entry(current, &info, idx, 1);
304}
305
306/*
307 * Perform set_thread_area on behalf of the traced child.
308 * Note: error handling is not done on the deferred load, and this differ from
309 * i386. However the only possible error are caused by bugs.
310 */
311int ptrace_set_thread_area(struct task_struct *child, int idx,
312 struct user_desc __user *user_desc)
313{
314 struct user_desc info;
315
316 if (!host_supports_tls)
317 return -EIO;
318
319 if (copy_from_user(&info, user_desc, sizeof(info)))
320 return -EFAULT;
321
322 return set_tls_entry(child, &info, idx, 0);
323}
324
325int sys_get_thread_area(struct user_desc __user *user_desc)
326{
327 struct user_desc info;
328 int idx, ret;
329
330 if (!host_supports_tls)
331 return -ENOSYS;
332
333 if (get_user(idx, &user_desc->entry_number))
334 return -EFAULT;
335
336 ret = get_tls_entry(current, &info, idx);
337 if (ret < 0)
338 goto out;
339
340 if (copy_to_user(user_desc, &info, sizeof(info)))
341 ret = -EFAULT;
342
343out:
344 return ret;
345}
346
347/*
348 * Perform get_thread_area on behalf of the traced child.
349 */
350int ptrace_get_thread_area(struct task_struct *child, int idx,
351 struct user_desc __user *user_desc)
352{
353 struct user_desc info;
354 int ret;
355
356 if (!host_supports_tls)
357 return -EIO;
358
359 ret = get_tls_entry(child, &info, idx);
360 if (ret < 0)
361 goto out;
362
363 if (copy_to_user(user_desc, &info, sizeof(info)))
364 ret = -EFAULT;
365out:
366 return ret;
367}
368
369/*
370 * This code is really i386-only, but it detects and logs x86_64 GDT indexes
371 * if a 32-bit UML is running on a 64-bit host.
372 */
373static int __init __setup_host_supports_tls(void)
374{
375 check_host_supports_tls(&host_supports_tls, &host_gdt_entry_tls_min);
376 if (host_supports_tls) {
377 printk(KERN_INFO "Host TLS support detected\n");
378 printk(KERN_INFO "Detected host type: ");
379 switch (host_gdt_entry_tls_min) {
380 case GDT_ENTRY_TLS_MIN_I386:
381 printk(KERN_CONT "i386");
382 break;
383 case GDT_ENTRY_TLS_MIN_X86_64:
384 printk(KERN_CONT "x86_64");
385 break;
386 }
387 printk(KERN_CONT " (GDT indexes %d to %d)\n",
388 host_gdt_entry_tls_min,
389 host_gdt_entry_tls_min + GDT_ENTRY_TLS_ENTRIES);
390 } else
391 printk(KERN_ERR " Host TLS support NOT detected! "
392 "TLS support inside UML will not work\n");
393 return 0;
394}
395
396__initcall(__setup_host_supports_tls);
diff --git a/arch/um/sys-x86/tls_64.c b/arch/um/sys-x86/tls_64.c
new file mode 100644
index 000000000000..f7ba46200ecd
--- /dev/null
+++ b/arch/um/sys-x86/tls_64.c
@@ -0,0 +1,17 @@
1#include "linux/sched.h"
2
3void clear_flushed_tls(struct task_struct *task)
4{
5}
6
7int arch_copy_tls(struct task_struct *t)
8{
9 /*
10 * If CLONE_SETTLS is set, we need to save the thread id
11 * (which is argument 5, child_tid, of clone) so it can be set
12 * during context switches.
13 */
14 t->thread.arch.fs = t->thread.regs.regs.gp[R8 / sizeof(long)];
15
16 return 0;
17}
diff --git a/arch/um/sys-x86/user-offsets.c b/arch/um/sys-x86/user-offsets.c
new file mode 100644
index 000000000000..718f0c0f0b0c
--- /dev/null
+++ b/arch/um/sys-x86/user-offsets.c
@@ -0,0 +1,86 @@
1#include <stdio.h>
2#include <stddef.h>
3#include <signal.h>
4#include <sys/poll.h>
5#include <sys/mman.h>
6#include <sys/user.h>
7#define __FRAME_OFFSETS
8#include <asm/ptrace.h>
9#include <asm/types.h>
10
11#define DEFINE(sym, val) \
12 asm volatile("\n->" #sym " %0 " #val : : "i" (val))
13
14#define DEFINE_LONGS(sym, val) \
15 asm volatile("\n->" #sym " %0 " #val : : "i" (val/sizeof(unsigned long)))
16
17#define OFFSET(sym, str, mem) \
18 DEFINE(sym, offsetof(struct str, mem));
19
20void foo(void)
21{
22 OFFSET(HOST_SC_TRAPNO, sigcontext, trapno);
23 OFFSET(HOST_SC_ERR, sigcontext, err);
24 OFFSET(HOST_SC_CR2, sigcontext, cr2);
25
26#ifdef __i386__
27 DEFINE_LONGS(HOST_FP_SIZE, sizeof(struct user_fpregs_struct));
28 DEFINE_LONGS(HOST_FPX_SIZE, sizeof(struct user_fpxregs_struct));
29
30 DEFINE(HOST_IP, EIP);
31 DEFINE(HOST_SP, UESP);
32 DEFINE(HOST_EFLAGS, EFL);
33 DEFINE(HOST_EAX, EAX);
34 DEFINE(HOST_EBX, EBX);
35 DEFINE(HOST_ECX, ECX);
36 DEFINE(HOST_EDX, EDX);
37 DEFINE(HOST_ESI, ESI);
38 DEFINE(HOST_EDI, EDI);
39 DEFINE(HOST_EBP, EBP);
40 DEFINE(HOST_CS, CS);
41 DEFINE(HOST_SS, SS);
42 DEFINE(HOST_DS, DS);
43 DEFINE(HOST_FS, FS);
44 DEFINE(HOST_ES, ES);
45 DEFINE(HOST_GS, GS);
46#else
47 DEFINE(HOST_FP_SIZE, sizeof(struct _fpstate) / sizeof(unsigned long));
48 DEFINE_LONGS(HOST_RBX, RBX);
49 DEFINE_LONGS(HOST_RCX, RCX);
50 DEFINE_LONGS(HOST_RDI, RDI);
51 DEFINE_LONGS(HOST_RSI, RSI);
52 DEFINE_LONGS(HOST_RDX, RDX);
53 DEFINE_LONGS(HOST_RBP, RBP);
54 DEFINE_LONGS(HOST_RAX, RAX);
55 DEFINE_LONGS(HOST_R8, R8);
56 DEFINE_LONGS(HOST_R9, R9);
57 DEFINE_LONGS(HOST_R10, R10);
58 DEFINE_LONGS(HOST_R11, R11);
59 DEFINE_LONGS(HOST_R12, R12);
60 DEFINE_LONGS(HOST_R13, R13);
61 DEFINE_LONGS(HOST_R14, R14);
62 DEFINE_LONGS(HOST_R15, R15);
63 DEFINE_LONGS(HOST_ORIG_RAX, ORIG_RAX);
64 DEFINE_LONGS(HOST_CS, CS);
65 DEFINE_LONGS(HOST_SS, SS);
66 DEFINE_LONGS(HOST_EFLAGS, EFLAGS);
67#if 0
68 DEFINE_LONGS(HOST_FS, FS);
69 DEFINE_LONGS(HOST_GS, GS);
70 DEFINE_LONGS(HOST_DS, DS);
71 DEFINE_LONGS(HOST_ES, ES);
72#endif
73
74 DEFINE_LONGS(HOST_IP, RIP);
75 DEFINE_LONGS(HOST_SP, RSP);
76#endif
77
78 DEFINE(UM_FRAME_SIZE, sizeof(struct user_regs_struct));
79 DEFINE(UM_POLLIN, POLLIN);
80 DEFINE(UM_POLLPRI, POLLPRI);
81 DEFINE(UM_POLLOUT, POLLOUT);
82
83 DEFINE(UM_PROT_READ, PROT_READ);
84 DEFINE(UM_PROT_WRITE, PROT_WRITE);
85 DEFINE(UM_PROT_EXEC, PROT_EXEC);
86}
diff --git a/arch/um/sys-x86/vdso/Makefile b/arch/um/sys-x86/vdso/Makefile
new file mode 100644
index 000000000000..5dffe6d46686
--- /dev/null
+++ b/arch/um/sys-x86/vdso/Makefile
@@ -0,0 +1,90 @@
1#
2# Building vDSO images for x86.
3#
4
5VDSO64-y := y
6
7vdso-install-$(VDSO64-y) += vdso.so
8
9
10# files to link into the vdso
11vobjs-y := vdso-note.o um_vdso.o
12
13# files to link into kernel
14obj-$(VDSO64-y) += vdso.o vma.o
15
16vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
17
18$(obj)/vdso.o: $(obj)/vdso.so
19
20targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y)
21
22export CPPFLAGS_vdso.lds += -P -C
23
24VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
25 -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
26
27$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so
28
29$(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
30 $(call if_changed,vdso)
31
32$(obj)/%.so: OBJCOPYFLAGS := -S
33$(obj)/%.so: $(obj)/%.so.dbg FORCE
34 $(call if_changed,objcopy)
35
36#
37# Don't omit frame pointers for ease of userspace debugging, but do
38# optimize sibling calls.
39#
40CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
41 $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
42 -fno-omit-frame-pointer -foptimize-sibling-calls
43
44$(vobjs): KBUILD_CFLAGS += $(CFL)
45
46#
47# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
48#
49CFLAGS_REMOVE_vdso-note.o = -pg
50CFLAGS_REMOVE_um_vdso.o = -pg
51
52targets += vdso-syms.lds
53obj-$(VDSO64-y) += vdso-syms.lds
54
55#
56# Match symbols in the DSO that look like VDSO*; produce a file of constants.
57#
58sed-vdsosym := -e 's/^00*/0/' \
59 -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p'
60quiet_cmd_vdsosym = VDSOSYM $@
61define cmd_vdsosym
62 $(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@
63endef
64
65$(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE
66 $(call if_changed,vdsosym)
67
68#
69# The DSO images are built using a special linker script.
70#
71quiet_cmd_vdso = VDSO $@
72 cmd_vdso = $(CC) -nostdlib -o $@ \
73 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
74 -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
75 sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
76
77VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
78GCOV_PROFILE := n
79
80#
81# Install the unstripped copy of vdso*.so listed in $(vdso-install-y).
82#
83quiet_cmd_vdso_install = INSTALL $@
84 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
85$(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE
86 @mkdir -p $(MODLIB)/vdso
87 $(call cmd,vdso_install)
88
89PHONY += vdso_install $(vdso-install-y)
90vdso_install: $(vdso-install-y)
diff --git a/arch/um/sys-x86/vdso/checkundef.sh b/arch/um/sys-x86/vdso/checkundef.sh
new file mode 100644
index 000000000000..7ee90a9b549d
--- /dev/null
+++ b/arch/um/sys-x86/vdso/checkundef.sh
@@ -0,0 +1,10 @@
1#!/bin/sh
2nm="$1"
3file="$2"
4$nm "$file" | grep '^ *U' > /dev/null 2>&1
5if [ $? -eq 1 ]; then
6 exit 0
7else
8 echo "$file: undefined symbols found" >&2
9 exit 1
10fi
diff --git a/arch/um/sys-x86/vdso/um_vdso.c b/arch/um/sys-x86/vdso/um_vdso.c
new file mode 100644
index 000000000000..7c441b59d375
--- /dev/null
+++ b/arch/um/sys-x86/vdso/um_vdso.c
@@ -0,0 +1,71 @@
1/*
2 * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This vDSO turns all calls into a syscall so that UML can trap them.
9 */
10
11
12/* Disable profiling for userspace code */
13#define DISABLE_BRANCH_PROFILING
14
15#include <linux/time.h>
16#include <linux/getcpu.h>
17#include <asm/unistd.h>
18
19int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
20{
21 long ret;
22
23 asm("syscall" : "=a" (ret) :
24 "0" (__NR_clock_gettime), "D" (clock), "S" (ts) : "memory");
25
26 return ret;
27}
28int clock_gettime(clockid_t, struct timespec *)
29 __attribute__((weak, alias("__vdso_clock_gettime")));
30
31int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
32{
33 long ret;
34
35 asm("syscall" : "=a" (ret) :
36 "0" (__NR_gettimeofday), "D" (tv), "S" (tz) : "memory");
37
38 return ret;
39}
40int gettimeofday(struct timeval *, struct timezone *)
41 __attribute__((weak, alias("__vdso_gettimeofday")));
42
43time_t __vdso_time(time_t *t)
44{
45 long secs;
46
47 asm volatile("syscall"
48 : "=a" (secs)
49 : "0" (__NR_time), "D" (t) : "cc", "r11", "cx", "memory");
50
51 return secs;
52}
53int time(time_t *t) __attribute__((weak, alias("__vdso_time")));
54
55long
56__vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused)
57{
58 /*
59 * UML does not support SMP, we can cheat here. :)
60 */
61
62 if (cpu)
63 *cpu = 0;
64 if (node)
65 *node = 0;
66
67 return 0;
68}
69
70long getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache)
71 __attribute__((weak, alias("__vdso_getcpu")));
diff --git a/arch/um/sys-x86/vdso/vdso-layout.lds.S b/arch/um/sys-x86/vdso/vdso-layout.lds.S
new file mode 100644
index 000000000000..634a2cf62046
--- /dev/null
+++ b/arch/um/sys-x86/vdso/vdso-layout.lds.S
@@ -0,0 +1,64 @@
1/*
2 * Linker script for vDSO. This is an ELF shared object prelinked to
3 * its virtual address, and with only one read-only segment.
4 * This script controls its layout.
5 */
6
7SECTIONS
8{
9 . = VDSO_PRELINK + SIZEOF_HEADERS;
10
11 .hash : { *(.hash) } :text
12 .gnu.hash : { *(.gnu.hash) }
13 .dynsym : { *(.dynsym) }
14 .dynstr : { *(.dynstr) }
15 .gnu.version : { *(.gnu.version) }
16 .gnu.version_d : { *(.gnu.version_d) }
17 .gnu.version_r : { *(.gnu.version_r) }
18
19 .note : { *(.note.*) } :text :note
20
21 .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
22 .eh_frame : { KEEP (*(.eh_frame)) } :text
23
24 .dynamic : { *(.dynamic) } :text :dynamic
25
26 .rodata : { *(.rodata*) } :text
27 .data : {
28 *(.data*)
29 *(.sdata*)
30 *(.got.plt) *(.got)
31 *(.gnu.linkonce.d.*)
32 *(.bss*)
33 *(.dynbss*)
34 *(.gnu.linkonce.b.*)
35 }
36
37 .altinstructions : { *(.altinstructions) }
38 .altinstr_replacement : { *(.altinstr_replacement) }
39
40 /*
41 * Align the actual code well away from the non-instruction data.
42 * This is the best thing for the I-cache.
43 */
44 . = ALIGN(0x100);
45
46 .text : { *(.text*) } :text =0x90909090
47}
48
49/*
50 * Very old versions of ld do not recognize this name token; use the constant.
51 */
52#define PT_GNU_EH_FRAME 0x6474e550
53
54/*
55 * We must supply the ELF program headers explicitly to get just one
56 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
57 */
58PHDRS
59{
60 text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
61 dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
62 note PT_NOTE FLAGS(4); /* PF_R */
63 eh_frame_hdr PT_GNU_EH_FRAME;
64}
diff --git a/arch/um/sys-x86/vdso/vdso-note.S b/arch/um/sys-x86/vdso/vdso-note.S
new file mode 100644
index 000000000000..79a071e4357e
--- /dev/null
+++ b/arch/um/sys-x86/vdso/vdso-note.S
@@ -0,0 +1,12 @@
1/*
2 * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
3 * Here we can supply some information useful to userland.
4 */
5
6#include <linux/uts.h>
7#include <linux/version.h>
8#include <linux/elfnote.h>
9
10ELFNOTE_START(Linux, 0, "a")
11 .long LINUX_VERSION_CODE
12ELFNOTE_END
diff --git a/arch/um/sys-x86/vdso/vdso.S b/arch/um/sys-x86/vdso/vdso.S
new file mode 100644
index 000000000000..03b053283f86
--- /dev/null
+++ b/arch/um/sys-x86/vdso/vdso.S
@@ -0,0 +1,10 @@
1#include <linux/init.h>
2
3__INITDATA
4
5 .globl vdso_start, vdso_end
6vdso_start:
7 .incbin "arch/um/sys-x86/vdso/vdso.so"
8vdso_end:
9
10__FINIT
diff --git a/arch/um/sys-x86/vdso/vdso.lds.S b/arch/um/sys-x86/vdso/vdso.lds.S
new file mode 100644
index 000000000000..b96b2677cad8
--- /dev/null
+++ b/arch/um/sys-x86/vdso/vdso.lds.S
@@ -0,0 +1,32 @@
1/*
2 * Linker script for 64-bit vDSO.
3 * We #include the file to define the layout details.
4 * Here we only choose the prelinked virtual address.
5 *
6 * This file defines the version script giving the user-exported symbols in
7 * the DSO. We can define local symbols here called VDSO* to make their
8 * values visible using the asm-x86/vdso.h macros from the kernel proper.
9 */
10
11#define VDSO_PRELINK 0xffffffffff700000
12#include "vdso-layout.lds.S"
13
14/*
15 * This controls what userland symbols we export from the vDSO.
16 */
17VERSION {
18 LINUX_2.6 {
19 global:
20 clock_gettime;
21 __vdso_clock_gettime;
22 gettimeofday;
23 __vdso_gettimeofday;
24 getcpu;
25 __vdso_getcpu;
26 time;
27 __vdso_time;
28 local: *;
29 };
30}
31
32VDSO64_PRELINK = VDSO_PRELINK;
diff --git a/arch/um/sys-x86/vdso/vma.c b/arch/um/sys-x86/vdso/vma.c
new file mode 100644
index 000000000000..9495c8d0ce37
--- /dev/null
+++ b/arch/um/sys-x86/vdso/vma.c
@@ -0,0 +1,74 @@
1/*
2 * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#include <linux/slab.h>
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <asm/page.h>
13#include <linux/init.h>
14
15unsigned int __read_mostly vdso_enabled = 1;
16unsigned long um_vdso_addr;
17
18extern unsigned long task_size;
19extern char vdso_start[], vdso_end[];
20
21static struct page **vdsop;
22
23static int __init init_vdso(void)
24{
25 struct page *um_vdso;
26
27 BUG_ON(vdso_end - vdso_start > PAGE_SIZE);
28
29 um_vdso_addr = task_size - PAGE_SIZE;
30
31 vdsop = kmalloc(GFP_KERNEL, sizeof(struct page *));
32 if (!vdsop)
33 goto oom;
34
35 um_vdso = alloc_page(GFP_KERNEL);
36 if (!um_vdso) {
37 kfree(vdsop);
38
39 goto oom;
40 }
41
42 copy_page(page_address(um_vdso), vdso_start);
43 *vdsop = um_vdso;
44
45 return 0;
46
47oom:
48 printk(KERN_ERR "Cannot allocate vdso\n");
49 vdso_enabled = 0;
50
51 return -ENOMEM;
52}
53subsys_initcall(init_vdso);
54
55int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
56{
57 int err;
58 struct mm_struct *mm = current->mm;
59
60 if (!vdso_enabled)
61 return 0;
62
63 down_write(&mm->mmap_sem);
64
65 err = install_special_mapping(mm, um_vdso_addr, PAGE_SIZE,
66 VM_READ|VM_EXEC|
67 VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
68 VM_ALWAYSDUMP,
69 vdsop);
70
71 up_write(&mm->mmap_sem);
72
73 return err;
74}
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-06 12:00:20 -0500