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Commit | Line | Data |
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1da177e4 | 1 | /* |
934135c1 | 2 | * SuperH process tracing |
1da177e4 | 3 | * |
934135c1 | 4 | * Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka |
34d0b5af | 5 | * Copyright (C) 2002 - 2009 Paul Mundt |
1da177e4 | 6 | * |
934135c1 PM |
7 | * Audit support by Yuichi Nakamura <ynakam@hitachisoft.jp> |
8 | * | |
9 | * This file is subject to the terms and conditions of the GNU General Public | |
10 | * License. See the file "COPYING" in the main directory of this archive | |
11 | * for more details. | |
1da177e4 | 12 | */ |
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/sched.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/smp.h> | |
1da177e4 LT |
17 | #include <linux/errno.h> |
18 | #include <linux/ptrace.h> | |
19 | #include <linux/user.h> | |
1da177e4 | 20 | #include <linux/security.h> |
7ed20e1a | 21 | #include <linux/signal.h> |
9432f968 | 22 | #include <linux/io.h> |
1322b9de | 23 | #include <linux/audit.h> |
c4637d47 | 24 | #include <linux/seccomp.h> |
ab99c733 | 25 | #include <linux/tracehook.h> |
934135c1 PM |
26 | #include <linux/elf.h> |
27 | #include <linux/regset.h> | |
34d0b5af | 28 | #include <linux/hw_breakpoint.h> |
1da177e4 LT |
29 | #include <asm/uaccess.h> |
30 | #include <asm/pgtable.h> | |
31 | #include <asm/system.h> | |
32 | #include <asm/processor.h> | |
33 | #include <asm/mmu_context.h> | |
fa43972f | 34 | #include <asm/syscalls.h> |
e7ab3cd2 | 35 | #include <asm/fpu.h> |
1da177e4 | 36 | |
a74f7e04 PM |
37 | #define CREATE_TRACE_POINTS |
38 | #include <trace/events/syscalls.h> | |
c652d780 | 39 | |
1da177e4 LT |
40 | /* |
41 | * This routine will get a word off of the process kernel stack. | |
42 | */ | |
43 | static inline int get_stack_long(struct task_struct *task, int offset) | |
44 | { | |
45 | unsigned char *stack; | |
46 | ||
3cf0f4ec | 47 | stack = (unsigned char *)task_pt_regs(task); |
1da177e4 LT |
48 | stack += offset; |
49 | return (*((int *)stack)); | |
50 | } | |
51 | ||
52 | /* | |
53 | * This routine will put a word on the process kernel stack. | |
54 | */ | |
55 | static inline int put_stack_long(struct task_struct *task, int offset, | |
56 | unsigned long data) | |
57 | { | |
58 | unsigned char *stack; | |
59 | ||
3cf0f4ec | 60 | stack = (unsigned char *)task_pt_regs(task); |
1da177e4 LT |
61 | stack += offset; |
62 | *(unsigned long *) stack = data; | |
63 | return 0; | |
64 | } | |
65 | ||
34d0b5af PM |
66 | void ptrace_triggered(struct perf_event *bp, int nmi, |
67 | struct perf_sample_data *data, struct pt_regs *regs) | |
c459dbf2 | 68 | { |
34d0b5af PM |
69 | struct perf_event_attr attr; |
70 | ||
71 | /* | |
72 | * Disable the breakpoint request here since ptrace has defined a | |
73 | * one-shot behaviour for breakpoint exceptions. | |
74 | */ | |
75 | attr = bp->attr; | |
76 | attr.disabled = true; | |
77 | modify_user_hw_breakpoint(bp, &attr); | |
78 | } | |
79 | ||
80 | static int set_single_step(struct task_struct *tsk, unsigned long addr) | |
c459dbf2 | 81 | { |
34d0b5af PM |
82 | struct thread_struct *thread = &tsk->thread; |
83 | struct perf_event *bp; | |
84 | struct perf_event_attr attr; | |
85 | ||
86 | bp = thread->ptrace_bps[0]; | |
87 | if (!bp) { | |
73266fc1 | 88 | ptrace_breakpoint_init(&attr); |
34d0b5af PM |
89 | |
90 | attr.bp_addr = addr; | |
91 | attr.bp_len = HW_BREAKPOINT_LEN_2; | |
92 | attr.bp_type = HW_BREAKPOINT_R; | |
c459dbf2 | 93 | |
34d0b5af PM |
94 | bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk); |
95 | if (IS_ERR(bp)) | |
96 | return PTR_ERR(bp); | |
97 | ||
98 | thread->ptrace_bps[0] = bp; | |
99 | } else { | |
100 | int err; | |
101 | ||
102 | attr = bp->attr; | |
103 | attr.bp_addr = addr; | |
104 | err = modify_user_hw_breakpoint(bp, &attr); | |
105 | if (unlikely(err)) | |
106 | return err; | |
107 | } | |
108 | ||
109 | return 0; | |
110 | } | |
c459dbf2 | 111 | |
c459dbf2 PM |
112 | void user_enable_single_step(struct task_struct *child) |
113 | { | |
34d0b5af | 114 | unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc)); |
c459dbf2 PM |
115 | |
116 | set_tsk_thread_flag(child, TIF_SINGLESTEP); | |
34d0b5af PM |
117 | |
118 | set_single_step(child, pc); | |
c459dbf2 PM |
119 | } |
120 | ||
121 | void user_disable_single_step(struct task_struct *child) | |
9432f968 SM |
122 | { |
123 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
9432f968 SM |
124 | } |
125 | ||
1da177e4 LT |
126 | /* |
127 | * Called by kernel/ptrace.c when detaching.. | |
128 | * | |
129 | * Make sure single step bits etc are not set. | |
130 | */ | |
131 | void ptrace_disable(struct task_struct *child) | |
132 | { | |
c459dbf2 | 133 | user_disable_single_step(child); |
1da177e4 LT |
134 | } |
135 | ||
934135c1 PM |
136 | static int genregs_get(struct task_struct *target, |
137 | const struct user_regset *regset, | |
138 | unsigned int pos, unsigned int count, | |
139 | void *kbuf, void __user *ubuf) | |
140 | { | |
141 | const struct pt_regs *regs = task_pt_regs(target); | |
142 | int ret; | |
143 | ||
144 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
145 | regs->regs, | |
146 | 0, 16 * sizeof(unsigned long)); | |
147 | if (!ret) | |
148 | /* PC, PR, SR, GBR, MACH, MACL, TRA */ | |
149 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
150 | ®s->pc, | |
151 | offsetof(struct pt_regs, pc), | |
152 | sizeof(struct pt_regs)); | |
153 | if (!ret) | |
154 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
155 | sizeof(struct pt_regs), -1); | |
156 | ||
157 | return ret; | |
158 | } | |
159 | ||
160 | static int genregs_set(struct task_struct *target, | |
161 | const struct user_regset *regset, | |
162 | unsigned int pos, unsigned int count, | |
163 | const void *kbuf, const void __user *ubuf) | |
164 | { | |
165 | struct pt_regs *regs = task_pt_regs(target); | |
166 | int ret; | |
167 | ||
168 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
169 | regs->regs, | |
170 | 0, 16 * sizeof(unsigned long)); | |
171 | if (!ret && count > 0) | |
172 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
173 | ®s->pc, | |
174 | offsetof(struct pt_regs, pc), | |
175 | sizeof(struct pt_regs)); | |
176 | if (!ret) | |
177 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
178 | sizeof(struct pt_regs), -1); | |
179 | ||
180 | return ret; | |
181 | } | |
182 | ||
e7ab3cd2 PM |
183 | #ifdef CONFIG_SH_FPU |
184 | int fpregs_get(struct task_struct *target, | |
185 | const struct user_regset *regset, | |
186 | unsigned int pos, unsigned int count, | |
187 | void *kbuf, void __user *ubuf) | |
188 | { | |
189 | int ret; | |
190 | ||
191 | ret = init_fpu(target); | |
192 | if (ret) | |
193 | return ret; | |
194 | ||
195 | if ((boot_cpu_data.flags & CPU_HAS_FPU)) | |
196 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
0ea820cf | 197 | &target->thread.xstate->hardfpu, 0, -1); |
e7ab3cd2 PM |
198 | |
199 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
0ea820cf | 200 | &target->thread.xstate->softfpu, 0, -1); |
e7ab3cd2 PM |
201 | } |
202 | ||
203 | static int fpregs_set(struct task_struct *target, | |
204 | const struct user_regset *regset, | |
205 | unsigned int pos, unsigned int count, | |
206 | const void *kbuf, const void __user *ubuf) | |
207 | { | |
208 | int ret; | |
209 | ||
210 | ret = init_fpu(target); | |
211 | if (ret) | |
212 | return ret; | |
213 | ||
214 | set_stopped_child_used_math(target); | |
215 | ||
216 | if ((boot_cpu_data.flags & CPU_HAS_FPU)) | |
217 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
0ea820cf | 218 | &target->thread.xstate->hardfpu, 0, -1); |
e7ab3cd2 PM |
219 | |
220 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
0ea820cf | 221 | &target->thread.xstate->softfpu, 0, -1); |
e7ab3cd2 PM |
222 | } |
223 | ||
224 | static int fpregs_active(struct task_struct *target, | |
225 | const struct user_regset *regset) | |
226 | { | |
227 | return tsk_used_math(target) ? regset->n : 0; | |
228 | } | |
229 | #endif | |
230 | ||
5dadb343 PM |
231 | #ifdef CONFIG_SH_DSP |
232 | static int dspregs_get(struct task_struct *target, | |
233 | const struct user_regset *regset, | |
234 | unsigned int pos, unsigned int count, | |
235 | void *kbuf, void __user *ubuf) | |
236 | { | |
01ab1039 MT |
237 | const struct pt_dspregs *regs = |
238 | (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs; | |
5dadb343 PM |
239 | int ret; |
240 | ||
241 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, | |
242 | 0, sizeof(struct pt_dspregs)); | |
243 | if (!ret) | |
244 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
245 | sizeof(struct pt_dspregs), -1); | |
246 | ||
247 | return ret; | |
248 | } | |
249 | ||
250 | static int dspregs_set(struct task_struct *target, | |
251 | const struct user_regset *regset, | |
252 | unsigned int pos, unsigned int count, | |
253 | const void *kbuf, const void __user *ubuf) | |
254 | { | |
01ab1039 MT |
255 | struct pt_dspregs *regs = |
256 | (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs; | |
5dadb343 PM |
257 | int ret; |
258 | ||
259 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, | |
260 | 0, sizeof(struct pt_dspregs)); | |
261 | if (!ret) | |
262 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
263 | sizeof(struct pt_dspregs), -1); | |
264 | ||
265 | return ret; | |
266 | } | |
72461997 PM |
267 | |
268 | static int dspregs_active(struct task_struct *target, | |
269 | const struct user_regset *regset) | |
270 | { | |
271 | struct pt_regs *regs = task_pt_regs(target); | |
272 | ||
273 | return regs->sr & SR_DSP ? regset->n : 0; | |
274 | } | |
5dadb343 PM |
275 | #endif |
276 | ||
eaaaeef3 PM |
277 | const struct pt_regs_offset regoffset_table[] = { |
278 | REGS_OFFSET_NAME(0), | |
279 | REGS_OFFSET_NAME(1), | |
280 | REGS_OFFSET_NAME(2), | |
281 | REGS_OFFSET_NAME(3), | |
282 | REGS_OFFSET_NAME(4), | |
283 | REGS_OFFSET_NAME(5), | |
284 | REGS_OFFSET_NAME(6), | |
285 | REGS_OFFSET_NAME(7), | |
286 | REGS_OFFSET_NAME(8), | |
287 | REGS_OFFSET_NAME(9), | |
288 | REGS_OFFSET_NAME(10), | |
289 | REGS_OFFSET_NAME(11), | |
290 | REGS_OFFSET_NAME(12), | |
291 | REGS_OFFSET_NAME(13), | |
292 | REGS_OFFSET_NAME(14), | |
293 | REGS_OFFSET_NAME(15), | |
294 | REG_OFFSET_NAME(pc), | |
295 | REG_OFFSET_NAME(pr), | |
296 | REG_OFFSET_NAME(sr), | |
297 | REG_OFFSET_NAME(gbr), | |
298 | REG_OFFSET_NAME(mach), | |
299 | REG_OFFSET_NAME(macl), | |
300 | REG_OFFSET_NAME(tra), | |
301 | REG_OFFSET_END, | |
302 | }; | |
303 | ||
934135c1 PM |
304 | /* |
305 | * These are our native regset flavours. | |
306 | */ | |
307 | enum sh_regset { | |
308 | REGSET_GENERAL, | |
e7ab3cd2 PM |
309 | #ifdef CONFIG_SH_FPU |
310 | REGSET_FPU, | |
311 | #endif | |
5dadb343 PM |
312 | #ifdef CONFIG_SH_DSP |
313 | REGSET_DSP, | |
314 | #endif | |
934135c1 PM |
315 | }; |
316 | ||
317 | static const struct user_regset sh_regsets[] = { | |
318 | /* | |
319 | * Format is: | |
320 | * R0 --> R15 | |
321 | * PC, PR, SR, GBR, MACH, MACL, TRA | |
322 | */ | |
323 | [REGSET_GENERAL] = { | |
324 | .core_note_type = NT_PRSTATUS, | |
325 | .n = ELF_NGREG, | |
326 | .size = sizeof(long), | |
327 | .align = sizeof(long), | |
328 | .get = genregs_get, | |
329 | .set = genregs_set, | |
330 | }, | |
5dadb343 | 331 | |
e7ab3cd2 PM |
332 | #ifdef CONFIG_SH_FPU |
333 | [REGSET_FPU] = { | |
334 | .core_note_type = NT_PRFPREG, | |
335 | .n = sizeof(struct user_fpu_struct) / sizeof(long), | |
336 | .size = sizeof(long), | |
337 | .align = sizeof(long), | |
338 | .get = fpregs_get, | |
339 | .set = fpregs_set, | |
340 | .active = fpregs_active, | |
341 | }, | |
342 | #endif | |
343 | ||
5dadb343 PM |
344 | #ifdef CONFIG_SH_DSP |
345 | [REGSET_DSP] = { | |
346 | .n = sizeof(struct pt_dspregs) / sizeof(long), | |
347 | .size = sizeof(long), | |
348 | .align = sizeof(long), | |
349 | .get = dspregs_get, | |
350 | .set = dspregs_set, | |
72461997 | 351 | .active = dspregs_active, |
5dadb343 PM |
352 | }, |
353 | #endif | |
934135c1 PM |
354 | }; |
355 | ||
356 | static const struct user_regset_view user_sh_native_view = { | |
357 | .name = "sh", | |
358 | .e_machine = EM_SH, | |
359 | .regsets = sh_regsets, | |
360 | .n = ARRAY_SIZE(sh_regsets), | |
361 | }; | |
362 | ||
f9540ece PM |
363 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
364 | { | |
365 | return &user_sh_native_view; | |
366 | } | |
367 | ||
9b05a69e NK |
368 | long arch_ptrace(struct task_struct *child, long request, |
369 | unsigned long addr, unsigned long data) | |
1da177e4 | 370 | { |
1da177e4 | 371 | struct user * dummy = NULL; |
fa43972f | 372 | unsigned long __user *datap = (unsigned long __user *)data; |
1da177e4 LT |
373 | int ret; |
374 | ||
1da177e4 | 375 | switch (request) { |
1da177e4 LT |
376 | /* read the word at location addr in the USER area. */ |
377 | case PTRACE_PEEKUSR: { | |
378 | unsigned long tmp; | |
379 | ||
380 | ret = -EIO; | |
9432f968 | 381 | if ((addr & 3) || addr < 0 || |
1da177e4 LT |
382 | addr > sizeof(struct user) - 3) |
383 | break; | |
384 | ||
385 | if (addr < sizeof(struct pt_regs)) | |
386 | tmp = get_stack_long(child, addr); | |
9b05a69e NK |
387 | else if (addr >= (unsigned long) &dummy->fpu && |
388 | addr < (unsigned long) &dummy->u_fpvalid) { | |
1da177e4 | 389 | if (!tsk_used_math(child)) { |
9b05a69e | 390 | if (addr == (unsigned long)&dummy->fpu.fpscr) |
1da177e4 LT |
391 | tmp = FPSCR_INIT; |
392 | else | |
393 | tmp = 0; | |
394 | } else | |
9b05a69e | 395 | tmp = ((unsigned long *)child->thread.xstate) |
1da177e4 | 396 | [(addr - (long)&dummy->fpu) >> 2]; |
9b05a69e | 397 | } else if (addr == (unsigned long) &dummy->u_fpvalid) |
1da177e4 | 398 | tmp = !!tsk_used_math(child); |
ba0d4740 PG |
399 | else if (addr == PT_TEXT_ADDR) |
400 | tmp = child->mm->start_code; | |
401 | else if (addr == PT_DATA_ADDR) | |
402 | tmp = child->mm->start_data; | |
403 | else if (addr == PT_TEXT_END_ADDR) | |
404 | tmp = child->mm->end_code; | |
405 | else if (addr == PT_TEXT_LEN) | |
406 | tmp = child->mm->end_code - child->mm->start_code; | |
1da177e4 LT |
407 | else |
408 | tmp = 0; | |
fa43972f | 409 | ret = put_user(tmp, datap); |
1da177e4 LT |
410 | break; |
411 | } | |
412 | ||
1da177e4 LT |
413 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
414 | ret = -EIO; | |
9432f968 | 415 | if ((addr & 3) || addr < 0 || |
1da177e4 LT |
416 | addr > sizeof(struct user) - 3) |
417 | break; | |
418 | ||
419 | if (addr < sizeof(struct pt_regs)) | |
420 | ret = put_stack_long(child, addr, data); | |
9b05a69e NK |
421 | else if (addr >= (unsigned long) &dummy->fpu && |
422 | addr < (unsigned long) &dummy->u_fpvalid) { | |
1da177e4 | 423 | set_stopped_child_used_math(child); |
9b05a69e | 424 | ((unsigned long *)child->thread.xstate) |
1da177e4 LT |
425 | [(addr - (long)&dummy->fpu) >> 2] = data; |
426 | ret = 0; | |
9b05a69e | 427 | } else if (addr == (unsigned long) &dummy->u_fpvalid) { |
1da177e4 LT |
428 | conditional_stopped_child_used_math(data, child); |
429 | ret = 0; | |
430 | } | |
431 | break; | |
432 | ||
934135c1 PM |
433 | case PTRACE_GETREGS: |
434 | return copy_regset_to_user(child, &user_sh_native_view, | |
435 | REGSET_GENERAL, | |
436 | 0, sizeof(struct pt_regs), | |
437 | (void __user *)data); | |
438 | case PTRACE_SETREGS: | |
439 | return copy_regset_from_user(child, &user_sh_native_view, | |
440 | REGSET_GENERAL, | |
441 | 0, sizeof(struct pt_regs), | |
442 | (const void __user *)data); | |
e7ab3cd2 PM |
443 | #ifdef CONFIG_SH_FPU |
444 | case PTRACE_GETFPREGS: | |
445 | return copy_regset_to_user(child, &user_sh_native_view, | |
446 | REGSET_FPU, | |
447 | 0, sizeof(struct user_fpu_struct), | |
448 | (void __user *)data); | |
449 | case PTRACE_SETFPREGS: | |
450 | return copy_regset_from_user(child, &user_sh_native_view, | |
451 | REGSET_FPU, | |
452 | 0, sizeof(struct user_fpu_struct), | |
453 | (const void __user *)data); | |
454 | #endif | |
1da177e4 | 455 | #ifdef CONFIG_SH_DSP |
5dadb343 PM |
456 | case PTRACE_GETDSPREGS: |
457 | return copy_regset_to_user(child, &user_sh_native_view, | |
458 | REGSET_DSP, | |
459 | 0, sizeof(struct pt_dspregs), | |
460 | (void __user *)data); | |
461 | case PTRACE_SETDSPREGS: | |
462 | return copy_regset_from_user(child, &user_sh_native_view, | |
463 | REGSET_DSP, | |
464 | 0, sizeof(struct pt_dspregs), | |
465 | (const void __user *)data); | |
1da177e4 LT |
466 | #endif |
467 | default: | |
468 | ret = ptrace_request(child, request, addr, data); | |
469 | break; | |
470 | } | |
481bed45 | 471 | |
1da177e4 LT |
472 | return ret; |
473 | } | |
474 | ||
9e5e2117 PM |
475 | static inline int audit_arch(void) |
476 | { | |
477 | int arch = EM_SH; | |
478 | ||
479 | #ifdef CONFIG_CPU_LITTLE_ENDIAN | |
480 | arch |= __AUDIT_ARCH_LE; | |
481 | #endif | |
482 | ||
483 | return arch; | |
484 | } | |
485 | ||
ab99c733 | 486 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 487 | { |
ab99c733 | 488 | long ret = 0; |
1da177e4 | 489 | |
c4637d47 PM |
490 | secure_computing(regs->regs[0]); |
491 | ||
ab99c733 PM |
492 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
493 | tracehook_report_syscall_entry(regs)) | |
494 | /* | |
495 | * Tracing decided this syscall should not happen. | |
496 | * We'll return a bogus call number to get an ENOSYS | |
497 | * error, but leave the original number in regs->regs[0]. | |
498 | */ | |
499 | ret = -1L; | |
1322b9de | 500 | |
a74f7e04 PM |
501 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
502 | trace_sys_enter(regs, regs->regs[0]); | |
c652d780 | 503 | |
ab99c733 | 504 | if (unlikely(current->audit_context)) |
9e5e2117 | 505 | audit_syscall_entry(audit_arch(), regs->regs[3], |
1322b9de YN |
506 | regs->regs[4], regs->regs[5], |
507 | regs->regs[6], regs->regs[7]); | |
508 | ||
ab99c733 PM |
509 | return ret ?: regs->regs[0]; |
510 | } | |
511 | ||
512 | asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) | |
513 | { | |
514 | int step; | |
515 | ||
516 | if (unlikely(current->audit_context)) | |
517 | audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]), | |
518 | regs->regs[0]); | |
519 | ||
a74f7e04 PM |
520 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
521 | trace_sys_exit(regs, regs->regs[0]); | |
c652d780 | 522 | |
ab99c733 PM |
523 | step = test_thread_flag(TIF_SINGLESTEP); |
524 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) | |
525 | tracehook_report_syscall_exit(regs, step); | |
1da177e4 | 526 | } |