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Commit | Line | Data |
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1da177e4 | 1 | /* |
4b27c47c | 2 | * arch/sh/kernel/ptrace_64.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
dd76279b | 5 | * Copyright (C) 2003 - 2008 Paul Mundt |
1da177e4 LT |
6 | * |
7 | * Started from SH3/4 version: | |
8 | * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka | |
9 | * | |
10 | * Original x86 implementation: | |
11 | * By Ross Biro 1/23/92 | |
12 | * edited by Linus Torvalds | |
13 | * | |
4b27c47c PM |
14 | * This file is subject to the terms and conditions of the GNU General Public |
15 | * License. See the file "COPYING" in the main directory of this archive | |
16 | * for more details. | |
1da177e4 | 17 | */ |
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | #include <linux/rwsem.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/smp.h> | |
d71415e8 | 23 | #include <linux/bitops.h> |
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/ptrace.h> | |
26 | #include <linux/user.h> | |
7ed20e1a | 27 | #include <linux/signal.h> |
481bed45 | 28 | #include <linux/syscalls.h> |
4b27c47c | 29 | #include <linux/audit.h> |
c4637d47 | 30 | #include <linux/seccomp.h> |
ab99c733 | 31 | #include <linux/tracehook.h> |
dd76279b PM |
32 | #include <linux/elf.h> |
33 | #include <linux/regset.h> | |
1da177e4 LT |
34 | #include <asm/io.h> |
35 | #include <asm/uaccess.h> | |
36 | #include <asm/pgtable.h> | |
37 | #include <asm/system.h> | |
38 | #include <asm/processor.h> | |
39 | #include <asm/mmu_context.h> | |
fa43972f | 40 | #include <asm/syscalls.h> |
50387b3e | 41 | #include <asm/fpu.h> |
1da177e4 | 42 | |
a74f7e04 PM |
43 | #define CREATE_TRACE_POINTS |
44 | #include <trace/events/syscalls.h> | |
45 | ||
1da177e4 LT |
46 | /* This mask defines the bits of the SR which the user is not allowed to |
47 | change, which are everything except S, Q, M, PR, SZ, FR. */ | |
48 | #define SR_MASK (0xffff8cfd) | |
49 | ||
50 | /* | |
51 | * does not yet catch signals sent when the child dies. | |
52 | * in exit.c or in signal.c. | |
53 | */ | |
54 | ||
55 | /* | |
56 | * This routine will get a word from the user area in the process kernel stack. | |
57 | */ | |
58 | static inline int get_stack_long(struct task_struct *task, int offset) | |
59 | { | |
60 | unsigned char *stack; | |
61 | ||
62 | stack = (unsigned char *)(task->thread.uregs); | |
63 | stack += offset; | |
64 | return (*((int *)stack)); | |
65 | } | |
66 | ||
67 | static inline unsigned long | |
68 | get_fpu_long(struct task_struct *task, unsigned long addr) | |
69 | { | |
70 | unsigned long tmp; | |
71 | struct pt_regs *regs; | |
72 | regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1; | |
73 | ||
74 | if (!tsk_used_math(task)) { | |
75 | if (addr == offsetof(struct user_fpu_struct, fpscr)) { | |
76 | tmp = FPSCR_INIT; | |
77 | } else { | |
78 | tmp = 0xffffffffUL; /* matches initial value in fpu.c */ | |
79 | } | |
80 | return tmp; | |
81 | } | |
82 | ||
83 | if (last_task_used_math == task) { | |
256b22ca | 84 | enable_fpu(); |
61cc7b0a | 85 | save_fpu(task); |
256b22ca | 86 | disable_fpu(); |
1da177e4 LT |
87 | last_task_used_math = 0; |
88 | regs->sr |= SR_FD; | |
89 | } | |
90 | ||
3ef2932b | 91 | tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)]; |
1da177e4 LT |
92 | return tmp; |
93 | } | |
94 | ||
95 | /* | |
96 | * This routine will put a word into the user area in the process kernel stack. | |
97 | */ | |
98 | static inline int put_stack_long(struct task_struct *task, int offset, | |
99 | unsigned long data) | |
100 | { | |
101 | unsigned char *stack; | |
102 | ||
103 | stack = (unsigned char *)(task->thread.uregs); | |
104 | stack += offset; | |
105 | *(unsigned long *) stack = data; | |
106 | return 0; | |
107 | } | |
108 | ||
109 | static inline int | |
110 | put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data) | |
111 | { | |
112 | struct pt_regs *regs; | |
113 | ||
114 | regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1; | |
115 | ||
116 | if (!tsk_used_math(task)) { | |
d6db8888 | 117 | init_fpu(task); |
1da177e4 | 118 | } else if (last_task_used_math == task) { |
256b22ca | 119 | enable_fpu(); |
61cc7b0a | 120 | save_fpu(task); |
256b22ca | 121 | disable_fpu(); |
1da177e4 LT |
122 | last_task_used_math = 0; |
123 | regs->sr |= SR_FD; | |
124 | } | |
125 | ||
3ef2932b | 126 | ((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data; |
1da177e4 LT |
127 | return 0; |
128 | } | |
129 | ||
c459dbf2 PM |
130 | void user_enable_single_step(struct task_struct *child) |
131 | { | |
132 | struct pt_regs *regs = child->thread.uregs; | |
133 | ||
134 | regs->sr |= SR_SSTEP; /* auto-resetting upon exception */ | |
4b505db9 PM |
135 | |
136 | set_tsk_thread_flag(child, TIF_SINGLESTEP); | |
c459dbf2 PM |
137 | } |
138 | ||
139 | void user_disable_single_step(struct task_struct *child) | |
140 | { | |
e311be52 AB |
141 | struct pt_regs *regs = child->thread.uregs; |
142 | ||
c459dbf2 | 143 | regs->sr &= ~SR_SSTEP; |
4b505db9 PM |
144 | |
145 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
c459dbf2 | 146 | } |
481bed45 | 147 | |
dd76279b PM |
148 | static int genregs_get(struct task_struct *target, |
149 | const struct user_regset *regset, | |
150 | unsigned int pos, unsigned int count, | |
151 | void *kbuf, void __user *ubuf) | |
152 | { | |
153 | const struct pt_regs *regs = task_pt_regs(target); | |
154 | int ret; | |
155 | ||
156 | /* PC, SR, SYSCALL */ | |
157 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
158 | ®s->pc, | |
159 | 0, 3 * sizeof(unsigned long long)); | |
160 | ||
161 | /* R1 -> R63 */ | |
162 | if (!ret) | |
163 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
164 | regs->regs, | |
165 | offsetof(struct pt_regs, regs[0]), | |
166 | 63 * sizeof(unsigned long long)); | |
167 | /* TR0 -> TR7 */ | |
168 | if (!ret) | |
169 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
170 | regs->tregs, | |
171 | offsetof(struct pt_regs, tregs[0]), | |
172 | 8 * sizeof(unsigned long long)); | |
173 | ||
174 | if (!ret) | |
175 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
176 | sizeof(struct pt_regs), -1); | |
177 | ||
178 | return ret; | |
179 | } | |
180 | ||
181 | static int genregs_set(struct task_struct *target, | |
182 | const struct user_regset *regset, | |
183 | unsigned int pos, unsigned int count, | |
184 | const void *kbuf, const void __user *ubuf) | |
185 | { | |
186 | struct pt_regs *regs = task_pt_regs(target); | |
187 | int ret; | |
188 | ||
189 | /* PC, SR, SYSCALL */ | |
190 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
191 | ®s->pc, | |
192 | 0, 3 * sizeof(unsigned long long)); | |
193 | ||
194 | /* R1 -> R63 */ | |
195 | if (!ret && count > 0) | |
196 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
197 | regs->regs, | |
198 | offsetof(struct pt_regs, regs[0]), | |
199 | 63 * sizeof(unsigned long long)); | |
200 | ||
201 | /* TR0 -> TR7 */ | |
202 | if (!ret && count > 0) | |
203 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
204 | regs->tregs, | |
205 | offsetof(struct pt_regs, tregs[0]), | |
206 | 8 * sizeof(unsigned long long)); | |
207 | ||
208 | if (!ret) | |
209 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
210 | sizeof(struct pt_regs), -1); | |
211 | ||
212 | return ret; | |
213 | } | |
214 | ||
215 | #ifdef CONFIG_SH_FPU | |
216 | int fpregs_get(struct task_struct *target, | |
217 | const struct user_regset *regset, | |
218 | unsigned int pos, unsigned int count, | |
219 | void *kbuf, void __user *ubuf) | |
220 | { | |
221 | int ret; | |
222 | ||
223 | ret = init_fpu(target); | |
224 | if (ret) | |
225 | return ret; | |
226 | ||
227 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
3ef2932b | 228 | &target->thread.xstate->hardfpu, 0, -1); |
dd76279b PM |
229 | } |
230 | ||
231 | static int fpregs_set(struct task_struct *target, | |
232 | const struct user_regset *regset, | |
233 | unsigned int pos, unsigned int count, | |
234 | const void *kbuf, const void __user *ubuf) | |
235 | { | |
236 | int ret; | |
237 | ||
238 | ret = init_fpu(target); | |
239 | if (ret) | |
240 | return ret; | |
241 | ||
242 | set_stopped_child_used_math(target); | |
243 | ||
244 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
3ef2932b | 245 | &target->thread.xstate->hardfpu, 0, -1); |
dd76279b PM |
246 | } |
247 | ||
248 | static int fpregs_active(struct task_struct *target, | |
249 | const struct user_regset *regset) | |
250 | { | |
251 | return tsk_used_math(target) ? regset->n : 0; | |
252 | } | |
253 | #endif | |
254 | ||
eaaaeef3 PM |
255 | const struct pt_regs_offset regoffset_table[] = { |
256 | REG_OFFSET_NAME(pc), | |
257 | REG_OFFSET_NAME(sr), | |
258 | REG_OFFSET_NAME(syscall_nr), | |
259 | REGS_OFFSET_NAME(0), | |
260 | REGS_OFFSET_NAME(1), | |
261 | REGS_OFFSET_NAME(2), | |
262 | REGS_OFFSET_NAME(3), | |
263 | REGS_OFFSET_NAME(4), | |
264 | REGS_OFFSET_NAME(5), | |
265 | REGS_OFFSET_NAME(6), | |
266 | REGS_OFFSET_NAME(7), | |
267 | REGS_OFFSET_NAME(8), | |
268 | REGS_OFFSET_NAME(9), | |
269 | REGS_OFFSET_NAME(10), | |
270 | REGS_OFFSET_NAME(11), | |
271 | REGS_OFFSET_NAME(12), | |
272 | REGS_OFFSET_NAME(13), | |
273 | REGS_OFFSET_NAME(14), | |
274 | REGS_OFFSET_NAME(15), | |
275 | REGS_OFFSET_NAME(16), | |
276 | REGS_OFFSET_NAME(17), | |
277 | REGS_OFFSET_NAME(18), | |
278 | REGS_OFFSET_NAME(19), | |
279 | REGS_OFFSET_NAME(20), | |
280 | REGS_OFFSET_NAME(21), | |
281 | REGS_OFFSET_NAME(22), | |
282 | REGS_OFFSET_NAME(23), | |
283 | REGS_OFFSET_NAME(24), | |
284 | REGS_OFFSET_NAME(25), | |
285 | REGS_OFFSET_NAME(26), | |
286 | REGS_OFFSET_NAME(27), | |
287 | REGS_OFFSET_NAME(28), | |
288 | REGS_OFFSET_NAME(29), | |
289 | REGS_OFFSET_NAME(30), | |
290 | REGS_OFFSET_NAME(31), | |
291 | REGS_OFFSET_NAME(32), | |
292 | REGS_OFFSET_NAME(33), | |
293 | REGS_OFFSET_NAME(34), | |
294 | REGS_OFFSET_NAME(35), | |
295 | REGS_OFFSET_NAME(36), | |
296 | REGS_OFFSET_NAME(37), | |
297 | REGS_OFFSET_NAME(38), | |
298 | REGS_OFFSET_NAME(39), | |
299 | REGS_OFFSET_NAME(40), | |
300 | REGS_OFFSET_NAME(41), | |
301 | REGS_OFFSET_NAME(42), | |
302 | REGS_OFFSET_NAME(43), | |
303 | REGS_OFFSET_NAME(44), | |
304 | REGS_OFFSET_NAME(45), | |
305 | REGS_OFFSET_NAME(46), | |
306 | REGS_OFFSET_NAME(47), | |
307 | REGS_OFFSET_NAME(48), | |
308 | REGS_OFFSET_NAME(49), | |
309 | REGS_OFFSET_NAME(50), | |
310 | REGS_OFFSET_NAME(51), | |
311 | REGS_OFFSET_NAME(52), | |
312 | REGS_OFFSET_NAME(53), | |
313 | REGS_OFFSET_NAME(54), | |
314 | REGS_OFFSET_NAME(55), | |
315 | REGS_OFFSET_NAME(56), | |
316 | REGS_OFFSET_NAME(57), | |
317 | REGS_OFFSET_NAME(58), | |
318 | REGS_OFFSET_NAME(59), | |
319 | REGS_OFFSET_NAME(60), | |
320 | REGS_OFFSET_NAME(61), | |
321 | REGS_OFFSET_NAME(62), | |
322 | REGS_OFFSET_NAME(63), | |
323 | TREGS_OFFSET_NAME(0), | |
324 | TREGS_OFFSET_NAME(1), | |
325 | TREGS_OFFSET_NAME(2), | |
326 | TREGS_OFFSET_NAME(3), | |
327 | TREGS_OFFSET_NAME(4), | |
328 | TREGS_OFFSET_NAME(5), | |
329 | TREGS_OFFSET_NAME(6), | |
330 | TREGS_OFFSET_NAME(7), | |
331 | REG_OFFSET_END, | |
332 | }; | |
333 | ||
dd76279b PM |
334 | /* |
335 | * These are our native regset flavours. | |
336 | */ | |
337 | enum sh_regset { | |
338 | REGSET_GENERAL, | |
339 | #ifdef CONFIG_SH_FPU | |
340 | REGSET_FPU, | |
341 | #endif | |
342 | }; | |
343 | ||
344 | static const struct user_regset sh_regsets[] = { | |
345 | /* | |
346 | * Format is: | |
347 | * PC, SR, SYSCALL, | |
348 | * R1 --> R63, | |
349 | * TR0 --> TR7, | |
350 | */ | |
351 | [REGSET_GENERAL] = { | |
352 | .core_note_type = NT_PRSTATUS, | |
353 | .n = ELF_NGREG, | |
354 | .size = sizeof(long long), | |
355 | .align = sizeof(long long), | |
356 | .get = genregs_get, | |
357 | .set = genregs_set, | |
358 | }, | |
359 | ||
360 | #ifdef CONFIG_SH_FPU | |
361 | [REGSET_FPU] = { | |
362 | .core_note_type = NT_PRFPREG, | |
363 | .n = sizeof(struct user_fpu_struct) / | |
364 | sizeof(long long), | |
365 | .size = sizeof(long long), | |
366 | .align = sizeof(long long), | |
367 | .get = fpregs_get, | |
368 | .set = fpregs_set, | |
369 | .active = fpregs_active, | |
370 | }, | |
371 | #endif | |
372 | }; | |
373 | ||
374 | static const struct user_regset_view user_sh64_native_view = { | |
375 | .name = "sh64", | |
376 | .e_machine = EM_SH, | |
377 | .regsets = sh_regsets, | |
378 | .n = ARRAY_SIZE(sh_regsets), | |
379 | }; | |
380 | ||
381 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
382 | { | |
383 | return &user_sh64_native_view; | |
384 | } | |
385 | ||
9b05a69e NK |
386 | long arch_ptrace(struct task_struct *child, long request, |
387 | unsigned long addr, unsigned long data) | |
1da177e4 | 388 | { |
1da177e4 | 389 | int ret; |
9e1cb206 | 390 | unsigned long __user *datap = (unsigned long __user *) data; |
1da177e4 | 391 | |
1da177e4 | 392 | switch (request) { |
1da177e4 LT |
393 | /* read the word at location addr in the USER area. */ |
394 | case PTRACE_PEEKUSR: { | |
395 | unsigned long tmp; | |
396 | ||
397 | ret = -EIO; | |
398 | if ((addr & 3) || addr < 0) | |
399 | break; | |
400 | ||
401 | if (addr < sizeof(struct pt_regs)) | |
402 | tmp = get_stack_long(child, addr); | |
403 | else if ((addr >= offsetof(struct user, fpu)) && | |
404 | (addr < offsetof(struct user, u_fpvalid))) { | |
9e1cb206 NK |
405 | unsigned long index; |
406 | index = addr - offsetof(struct user, fpu); | |
407 | tmp = get_fpu_long(child, index); | |
1da177e4 LT |
408 | } else if (addr == offsetof(struct user, u_fpvalid)) { |
409 | tmp = !!tsk_used_math(child); | |
410 | } else { | |
411 | break; | |
412 | } | |
9e1cb206 | 413 | ret = put_user(tmp, datap); |
1da177e4 LT |
414 | break; |
415 | } | |
416 | ||
1da177e4 LT |
417 | case PTRACE_POKEUSR: |
418 | /* write the word at location addr in the USER area. We must | |
419 | disallow any changes to certain SR bits or u_fpvalid, since | |
420 | this could crash the kernel or result in a security | |
421 | loophole. */ | |
422 | ret = -EIO; | |
423 | if ((addr & 3) || addr < 0) | |
424 | break; | |
425 | ||
426 | if (addr < sizeof(struct pt_regs)) { | |
427 | /* Ignore change of top 32 bits of SR */ | |
428 | if (addr == offsetof (struct pt_regs, sr)+4) | |
429 | { | |
430 | ret = 0; | |
431 | break; | |
432 | } | |
433 | /* If lower 32 bits of SR, ignore non-user bits */ | |
434 | if (addr == offsetof (struct pt_regs, sr)) | |
435 | { | |
436 | long cursr = get_stack_long(child, addr); | |
437 | data &= ~(SR_MASK); | |
438 | data |= (cursr & SR_MASK); | |
439 | } | |
440 | ret = put_stack_long(child, addr, data); | |
441 | } | |
442 | else if ((addr >= offsetof(struct user, fpu)) && | |
443 | (addr < offsetof(struct user, u_fpvalid))) { | |
9e1cb206 NK |
444 | unsigned long index; |
445 | index = addr - offsetof(struct user, fpu); | |
446 | ret = put_fpu_long(child, index, data); | |
1da177e4 LT |
447 | } |
448 | break; | |
449 | ||
dd76279b PM |
450 | case PTRACE_GETREGS: |
451 | return copy_regset_to_user(child, &user_sh64_native_view, | |
452 | REGSET_GENERAL, | |
453 | 0, sizeof(struct pt_regs), | |
9e1cb206 | 454 | datap); |
dd76279b PM |
455 | case PTRACE_SETREGS: |
456 | return copy_regset_from_user(child, &user_sh64_native_view, | |
457 | REGSET_GENERAL, | |
458 | 0, sizeof(struct pt_regs), | |
9e1cb206 | 459 | datap); |
dd76279b PM |
460 | #ifdef CONFIG_SH_FPU |
461 | case PTRACE_GETFPREGS: | |
462 | return copy_regset_to_user(child, &user_sh64_native_view, | |
463 | REGSET_FPU, | |
464 | 0, sizeof(struct user_fpu_struct), | |
9e1cb206 | 465 | datap); |
dd76279b PM |
466 | case PTRACE_SETFPREGS: |
467 | return copy_regset_from_user(child, &user_sh64_native_view, | |
468 | REGSET_FPU, | |
469 | 0, sizeof(struct user_fpu_struct), | |
9e1cb206 | 470 | datap); |
dd76279b | 471 | #endif |
1da177e4 LT |
472 | default: |
473 | ret = ptrace_request(child, request, addr, data); | |
474 | break; | |
475 | } | |
dd76279b | 476 | |
1da177e4 LT |
477 | return ret; |
478 | } | |
479 | ||
9b05a69e NK |
480 | asmlinkage int sh64_ptrace(long request, long pid, |
481 | unsigned long addr, unsigned long data) | |
481bed45 | 482 | { |
481bed45 | 483 | #define WPC_DBRMODE 0x0d104008 |
d71415e8 | 484 | static unsigned long first_call; |
481bed45 | 485 | |
d71415e8 | 486 | if (!test_and_set_bit(0, &first_call)) { |
481bed45 CH |
487 | /* Set WPC.DBRMODE to 0. This makes all debug events get |
488 | * delivered through RESVEC, i.e. into the handlers in entry.S. | |
489 | * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE | |
490 | * would normally be left set to 1, which makes debug events get | |
491 | * delivered through DBRVEC, i.e. into the remote gdb's | |
492 | * handlers. This prevents ptrace getting them, and confuses | |
493 | * the remote gdb.) */ | |
494 | printk("DBRMODE set to 0 to permit native debugging\n"); | |
495 | poke_real_address_q(WPC_DBRMODE, 0); | |
481bed45 | 496 | } |
481bed45 CH |
497 | |
498 | return sys_ptrace(request, pid, addr, data); | |
499 | } | |
500 | ||
9e5e2117 PM |
501 | static inline int audit_arch(void) |
502 | { | |
503 | int arch = EM_SH; | |
504 | ||
505 | #ifdef CONFIG_64BIT | |
506 | arch |= __AUDIT_ARCH_64BIT; | |
507 | #endif | |
508 | #ifdef CONFIG_CPU_LITTLE_ENDIAN | |
509 | arch |= __AUDIT_ARCH_LE; | |
510 | #endif | |
511 | ||
512 | return arch; | |
513 | } | |
514 | ||
ab99c733 | 515 | asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 516 | { |
ab99c733 | 517 | long long ret = 0; |
1da177e4 | 518 | |
c4637d47 PM |
519 | secure_computing(regs->regs[9]); |
520 | ||
ab99c733 PM |
521 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
522 | tracehook_report_syscall_entry(regs)) | |
523 | /* | |
524 | * Tracing decided this syscall should not happen. | |
525 | * We'll return a bogus call number to get an ENOSYS | |
526 | * error, but leave the original number in regs->regs[0]. | |
527 | */ | |
528 | ret = -1LL; | |
4b27c47c | 529 | |
a74f7e04 PM |
530 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
531 | trace_sys_enter(regs, regs->regs[9]); | |
532 | ||
ab99c733 | 533 | if (unlikely(current->audit_context)) |
9e5e2117 | 534 | audit_syscall_entry(audit_arch(), regs->regs[1], |
4b27c47c PM |
535 | regs->regs[2], regs->regs[3], |
536 | regs->regs[4], regs->regs[5]); | |
ab99c733 PM |
537 | |
538 | return ret ?: regs->regs[9]; | |
539 | } | |
540 | ||
541 | asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) | |
542 | { | |
4b505db9 PM |
543 | int step; |
544 | ||
ab99c733 PM |
545 | if (unlikely(current->audit_context)) |
546 | audit_syscall_exit(AUDITSC_RESULT(regs->regs[9]), | |
547 | regs->regs[9]); | |
548 | ||
a74f7e04 PM |
549 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
550 | trace_sys_exit(regs, regs->regs[9]); | |
551 | ||
4b505db9 PM |
552 | step = test_thread_flag(TIF_SINGLESTEP); |
553 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) | |
554 | tracehook_report_syscall_exit(regs, step); | |
1da177e4 LT |
555 | } |
556 | ||
557 | /* Called with interrupts disabled */ | |
558 | asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs) | |
559 | { | |
560 | /* This is called after a single step exception (DEBUGSS). | |
561 | There is no need to change the PC, as it is a post-execution | |
562 | exception, as entry.S does not do anything to the PC for DEBUGSS. | |
563 | We need to clear the Single Step setting in SR to avoid | |
564 | continually stepping. */ | |
565 | local_irq_enable(); | |
566 | regs->sr &= ~SR_SSTEP; | |
567 | force_sig(SIGTRAP, current); | |
568 | } | |
569 | ||
570 | /* Called with interrupts disabled */ | |
a4ae2b2b | 571 | BUILD_TRAP_HANDLER(breakpoint) |
1da177e4 | 572 | { |
a4ae2b2b PM |
573 | TRAP_HANDLER_DECL; |
574 | ||
1da177e4 LT |
575 | /* We need to forward step the PC, to counteract the backstep done |
576 | in signal.c. */ | |
577 | local_irq_enable(); | |
578 | force_sig(SIGTRAP, current); | |
579 | regs->pc += 4; | |
580 | } | |
581 | ||
582 | /* | |
583 | * Called by kernel/ptrace.c when detaching.. | |
584 | * | |
585 | * Make sure single step bits etc are not set. | |
586 | */ | |
587 | void ptrace_disable(struct task_struct *child) | |
588 | { | |
c459dbf2 | 589 | user_disable_single_step(child); |
1da177e4 | 590 | } |