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12#include <linux/kernel.h>
13#include <linux/sched/signal.h>
14#include <linux/sched/task_stack.h>
15#include <linux/mm.h>
16#include <linux/elf.h>
17#include <linux/smp.h>
18#include <linux/ptrace.h>
19#include <linux/user.h>
20#include <linux/security.h>
21#include <linux/init.h>
22#include <linux/signal.h>
23#include <linux/uaccess.h>
24#include <linux/perf_event.h>
25#include <linux/hw_breakpoint.h>
26#include <linux/regset.h>
27#include <linux/audit.h>
28#include <linux/tracehook.h>
29#include <linux/unistd.h>
30
31#include <asm/pgtable.h>
32#include <asm/traps.h>
33
34#define CREATE_TRACE_POINTS
35#include <trace/events/syscalls.h>
36
37#define REG_PC 15
38#define REG_PSR 16
39
40
41
42
43
44#if 0
45
46
47
48#define BREAKINST_ARM 0xef9f0001
49#define BREAKINST_THUMB 0xdf00
50#else
51
52
53
54
55
56
57
58
59#define BREAKINST_ARM 0xe7f001f0
60#define BREAKINST_THUMB 0xde01
61#endif
62
63struct pt_regs_offset {
64 const char *name;
65 int offset;
66};
67
68#define REG_OFFSET_NAME(r) \
69 {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)}
70#define REG_OFFSET_END {.name = NULL, .offset = 0}
71
72static const struct pt_regs_offset regoffset_table[] = {
73 REG_OFFSET_NAME(r0),
74 REG_OFFSET_NAME(r1),
75 REG_OFFSET_NAME(r2),
76 REG_OFFSET_NAME(r3),
77 REG_OFFSET_NAME(r4),
78 REG_OFFSET_NAME(r5),
79 REG_OFFSET_NAME(r6),
80 REG_OFFSET_NAME(r7),
81 REG_OFFSET_NAME(r8),
82 REG_OFFSET_NAME(r9),
83 REG_OFFSET_NAME(r10),
84 REG_OFFSET_NAME(fp),
85 REG_OFFSET_NAME(ip),
86 REG_OFFSET_NAME(sp),
87 REG_OFFSET_NAME(lr),
88 REG_OFFSET_NAME(pc),
89 REG_OFFSET_NAME(cpsr),
90 REG_OFFSET_NAME(ORIG_r0),
91 REG_OFFSET_END,
92};
93
94
95
96
97
98
99
100
101int regs_query_register_offset(const char *name)
102{
103 const struct pt_regs_offset *roff;
104 for (roff = regoffset_table; roff->name != NULL; roff++)
105 if (!strcmp(roff->name, name))
106 return roff->offset;
107 return -EINVAL;
108}
109
110
111
112
113
114
115
116
117const char *regs_query_register_name(unsigned int offset)
118{
119 const struct pt_regs_offset *roff;
120 for (roff = regoffset_table; roff->name != NULL; roff++)
121 if (roff->offset == offset)
122 return roff->name;
123 return NULL;
124}
125
126
127
128
129
130
131
132
133
134bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
135{
136 return ((addr & ~(THREAD_SIZE - 1)) ==
137 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
138}
139
140
141
142
143
144
145
146
147
148
149unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
150{
151 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
152 addr += n;
153 if (regs_within_kernel_stack(regs, (unsigned long)addr))
154 return *addr;
155 else
156 return 0;
157}
158
159
160
161
162
163
164
165static inline long get_user_reg(struct task_struct *task, int offset)
166{
167 return task_pt_regs(task)->uregs[offset];
168}
169
170
171
172
173
174
175
176static inline int
177put_user_reg(struct task_struct *task, int offset, long data)
178{
179 struct pt_regs newregs, *regs = task_pt_regs(task);
180 int ret = -EINVAL;
181
182 newregs = *regs;
183 newregs.uregs[offset] = data;
184
185 if (valid_user_regs(&newregs)) {
186 regs->uregs[offset] = data;
187 ret = 0;
188 }
189
190 return ret;
191}
192
193
194
195
196void ptrace_disable(struct task_struct *child)
197{
198
199}
200
201
202
203
204void ptrace_break(struct task_struct *tsk, struct pt_regs *regs)
205{
206 siginfo_t info;
207
208 info.si_signo = SIGTRAP;
209 info.si_errno = 0;
210 info.si_code = TRAP_BRKPT;
211 info.si_addr = (void __user *)instruction_pointer(regs);
212
213 force_sig_info(SIGTRAP, &info, tsk);
214}
215
216static int break_trap(struct pt_regs *regs, unsigned int instr)
217{
218 ptrace_break(current, regs);
219 return 0;
220}
221
222static struct undef_hook arm_break_hook = {
223 .instr_mask = 0x0fffffff,
224 .instr_val = 0x07f001f0,
225 .cpsr_mask = PSR_T_BIT,
226 .cpsr_val = 0,
227 .fn = break_trap,
228};
229
230static struct undef_hook thumb_break_hook = {
231 .instr_mask = 0xffff,
232 .instr_val = 0xde01,
233 .cpsr_mask = PSR_T_BIT,
234 .cpsr_val = PSR_T_BIT,
235 .fn = break_trap,
236};
237
238static struct undef_hook thumb2_break_hook = {
239 .instr_mask = 0xffffffff,
240 .instr_val = 0xf7f0a000,
241 .cpsr_mask = PSR_T_BIT,
242 .cpsr_val = PSR_T_BIT,
243 .fn = break_trap,
244};
245
246static int __init ptrace_break_init(void)
247{
248 register_undef_hook(&arm_break_hook);
249 register_undef_hook(&thumb_break_hook);
250 register_undef_hook(&thumb2_break_hook);
251 return 0;
252}
253
254core_initcall(ptrace_break_init);
255
256
257
258
259
260static int ptrace_read_user(struct task_struct *tsk, unsigned long off,
261 unsigned long __user *ret)
262{
263 unsigned long tmp;
264
265 if (off & 3)
266 return -EIO;
267
268 tmp = 0;
269 if (off == PT_TEXT_ADDR)
270 tmp = tsk->mm->start_code;
271 else if (off == PT_DATA_ADDR)
272 tmp = tsk->mm->start_data;
273 else if (off == PT_TEXT_END_ADDR)
274 tmp = tsk->mm->end_code;
275 else if (off < sizeof(struct pt_regs))
276 tmp = get_user_reg(tsk, off >> 2);
277 else if (off >= sizeof(struct user))
278 return -EIO;
279
280 return put_user(tmp, ret);
281}
282
283
284
285
286
287static int ptrace_write_user(struct task_struct *tsk, unsigned long off,
288 unsigned long val)
289{
290 if (off & 3 || off >= sizeof(struct user))
291 return -EIO;
292
293 if (off >= sizeof(struct pt_regs))
294 return 0;
295
296 return put_user_reg(tsk, off >> 2, val);
297}
298
299#ifdef CONFIG_IWMMXT
300
301
302
303
304static int ptrace_getwmmxregs(struct task_struct *tsk, void __user *ufp)
305{
306 struct thread_info *thread = task_thread_info(tsk);
307
308 if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT))
309 return -ENODATA;
310 iwmmxt_task_disable(thread);
311 return copy_to_user(ufp, &thread->fpstate.iwmmxt, IWMMXT_SIZE)
312 ? -EFAULT : 0;
313}
314
315
316
317
318static int ptrace_setwmmxregs(struct task_struct *tsk, void __user *ufp)
319{
320 struct thread_info *thread = task_thread_info(tsk);
321
322 if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT))
323 return -EACCES;
324 iwmmxt_task_release(thread);
325 return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE)
326 ? -EFAULT : 0;
327}
328
329#endif
330
331#ifdef CONFIG_CRUNCH
332
333
334
335static int ptrace_getcrunchregs(struct task_struct *tsk, void __user *ufp)
336{
337 struct thread_info *thread = task_thread_info(tsk);
338
339 crunch_task_disable(thread);
340 return copy_to_user(ufp, &thread->crunchstate, CRUNCH_SIZE)
341 ? -EFAULT : 0;
342}
343
344
345
346
347static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp)
348{
349 struct thread_info *thread = task_thread_info(tsk);
350
351 crunch_task_release(thread);
352 return copy_from_user(&thread->crunchstate, ufp, CRUNCH_SIZE)
353 ? -EFAULT : 0;
354}
355#endif
356
357#ifdef CONFIG_HAVE_HW_BREAKPOINT
358
359
360
361
362
363
364
365static int ptrace_hbp_num_to_idx(long num)
366{
367 if (num < 0)
368 num = (ARM_MAX_BRP << 1) - num;
369 return (num - 1) >> 1;
370}
371
372
373
374
375
376static long ptrace_hbp_idx_to_num(int idx)
377{
378 long mid = ARM_MAX_BRP << 1;
379 long num = (idx << 1) + 1;
380 return num > mid ? mid - num : num;
381}
382
383
384
385
386static void ptrace_hbptriggered(struct perf_event *bp,
387 struct perf_sample_data *data,
388 struct pt_regs *regs)
389{
390 struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
391 long num;
392 int i;
393
394 for (i = 0; i < ARM_MAX_HBP_SLOTS; ++i)
395 if (current->thread.debug.hbp[i] == bp)
396 break;
397
398 num = (i == ARM_MAX_HBP_SLOTS) ? 0 : ptrace_hbp_idx_to_num(i);
399
400 force_sig_ptrace_errno_trap((int)num, (void __user *)(bkpt->trigger));
401}
402
403
404
405
406
407
408void clear_ptrace_hw_breakpoint(struct task_struct *tsk)
409{
410 memset(tsk->thread.debug.hbp, 0, sizeof(tsk->thread.debug.hbp));
411}
412
413
414
415
416
417void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
418{
419 int i;
420 struct thread_struct *t = &tsk->thread;
421
422 for (i = 0; i < ARM_MAX_HBP_SLOTS; i++) {
423 if (t->debug.hbp[i]) {
424 unregister_hw_breakpoint(t->debug.hbp[i]);
425 t->debug.hbp[i] = NULL;
426 }
427 }
428}
429
430static u32 ptrace_get_hbp_resource_info(void)
431{
432 u8 num_brps, num_wrps, debug_arch, wp_len;
433 u32 reg = 0;
434
435 num_brps = hw_breakpoint_slots(TYPE_INST);
436 num_wrps = hw_breakpoint_slots(TYPE_DATA);
437 debug_arch = arch_get_debug_arch();
438 wp_len = arch_get_max_wp_len();
439
440 reg |= debug_arch;
441 reg <<= 8;
442 reg |= wp_len;
443 reg <<= 8;
444 reg |= num_wrps;
445 reg <<= 8;
446 reg |= num_brps;
447
448 return reg;
449}
450
451static struct perf_event *ptrace_hbp_create(struct task_struct *tsk, int type)
452{
453 struct perf_event_attr attr;
454
455 ptrace_breakpoint_init(&attr);
456
457
458 attr.bp_addr = 0;
459 attr.bp_len = HW_BREAKPOINT_LEN_4;
460 attr.bp_type = type;
461 attr.disabled = 1;
462
463 return register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL,
464 tsk);
465}
466
467static int ptrace_gethbpregs(struct task_struct *tsk, long num,
468 unsigned long __user *data)
469{
470 u32 reg;
471 int idx, ret = 0;
472 struct perf_event *bp;
473 struct arch_hw_breakpoint_ctrl arch_ctrl;
474
475 if (num == 0) {
476 reg = ptrace_get_hbp_resource_info();
477 } else {
478 idx = ptrace_hbp_num_to_idx(num);
479 if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) {
480 ret = -EINVAL;
481 goto out;
482 }
483
484 bp = tsk->thread.debug.hbp[idx];
485 if (!bp) {
486 reg = 0;
487 goto put;
488 }
489
490 arch_ctrl = counter_arch_bp(bp)->ctrl;
491
492
493
494
495
496 while (!(arch_ctrl.len & 0x1))
497 arch_ctrl.len >>= 1;
498
499 if (num & 0x1)
500 reg = bp->attr.bp_addr;
501 else
502 reg = encode_ctrl_reg(arch_ctrl);
503 }
504
505put:
506 if (put_user(reg, data))
507 ret = -EFAULT;
508
509out:
510 return ret;
511}
512
513static int ptrace_sethbpregs(struct task_struct *tsk, long num,
514 unsigned long __user *data)
515{
516 int idx, gen_len, gen_type, implied_type, ret = 0;
517 u32 user_val;
518 struct perf_event *bp;
519 struct arch_hw_breakpoint_ctrl ctrl;
520 struct perf_event_attr attr;
521
522 if (num == 0)
523 goto out;
524 else if (num < 0)
525 implied_type = HW_BREAKPOINT_RW;
526 else
527 implied_type = HW_BREAKPOINT_X;
528
529 idx = ptrace_hbp_num_to_idx(num);
530 if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) {
531 ret = -EINVAL;
532 goto out;
533 }
534
535 if (get_user(user_val, data)) {
536 ret = -EFAULT;
537 goto out;
538 }
539
540 bp = tsk->thread.debug.hbp[idx];
541 if (!bp) {
542 bp = ptrace_hbp_create(tsk, implied_type);
543 if (IS_ERR(bp)) {
544 ret = PTR_ERR(bp);
545 goto out;
546 }
547 tsk->thread.debug.hbp[idx] = bp;
548 }
549
550 attr = bp->attr;
551
552 if (num & 0x1) {
553
554 attr.bp_addr = user_val;
555 } else {
556
557 decode_ctrl_reg(user_val, &ctrl);
558 ret = arch_bp_generic_fields(ctrl, &gen_len, &gen_type);
559 if (ret)
560 goto out;
561
562 if ((gen_type & implied_type) != gen_type) {
563 ret = -EINVAL;
564 goto out;
565 }
566
567 attr.bp_len = gen_len;
568 attr.bp_type = gen_type;
569 attr.disabled = !ctrl.enabled;
570 }
571
572 ret = modify_user_hw_breakpoint(bp, &attr);
573out:
574 return ret;
575}
576#endif
577
578
579
580static int gpr_get(struct task_struct *target,
581 const struct user_regset *regset,
582 unsigned int pos, unsigned int count,
583 void *kbuf, void __user *ubuf)
584{
585 struct pt_regs *regs = task_pt_regs(target);
586
587 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
588 regs,
589 0, sizeof(*regs));
590}
591
592static int gpr_set(struct task_struct *target,
593 const struct user_regset *regset,
594 unsigned int pos, unsigned int count,
595 const void *kbuf, const void __user *ubuf)
596{
597 int ret;
598 struct pt_regs newregs = *task_pt_regs(target);
599
600 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
601 &newregs,
602 0, sizeof(newregs));
603 if (ret)
604 return ret;
605
606 if (!valid_user_regs(&newregs))
607 return -EINVAL;
608
609 *task_pt_regs(target) = newregs;
610 return 0;
611}
612
613static int fpa_get(struct task_struct *target,
614 const struct user_regset *regset,
615 unsigned int pos, unsigned int count,
616 void *kbuf, void __user *ubuf)
617{
618 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
619 &task_thread_info(target)->fpstate,
620 0, sizeof(struct user_fp));
621}
622
623static int fpa_set(struct task_struct *target,
624 const struct user_regset *regset,
625 unsigned int pos, unsigned int count,
626 const void *kbuf, const void __user *ubuf)
627{
628 struct thread_info *thread = task_thread_info(target);
629
630 thread->used_cp[1] = thread->used_cp[2] = 1;
631
632 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
633 &thread->fpstate,
634 0, sizeof(struct user_fp));
635}
636
637#ifdef CONFIG_VFP
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660static int vfp_get(struct task_struct *target,
661 const struct user_regset *regset,
662 unsigned int pos, unsigned int count,
663 void *kbuf, void __user *ubuf)
664{
665 int ret;
666 struct thread_info *thread = task_thread_info(target);
667 struct vfp_hard_struct const *vfp = &thread->vfpstate.hard;
668 const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs);
669 const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr);
670
671 vfp_sync_hwstate(thread);
672
673 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
674 &vfp->fpregs,
675 user_fpregs_offset,
676 user_fpregs_offset + sizeof(vfp->fpregs));
677 if (ret)
678 return ret;
679
680 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
681 user_fpregs_offset + sizeof(vfp->fpregs),
682 user_fpscr_offset);
683 if (ret)
684 return ret;
685
686 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
687 &vfp->fpscr,
688 user_fpscr_offset,
689 user_fpscr_offset + sizeof(vfp->fpscr));
690}
691
692
693
694
695
696
697static int vfp_set(struct task_struct *target,
698 const struct user_regset *regset,
699 unsigned int pos, unsigned int count,
700 const void *kbuf, const void __user *ubuf)
701{
702 int ret;
703 struct thread_info *thread = task_thread_info(target);
704 struct vfp_hard_struct new_vfp;
705 const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs);
706 const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr);
707
708 vfp_sync_hwstate(thread);
709 new_vfp = thread->vfpstate.hard;
710
711 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
712 &new_vfp.fpregs,
713 user_fpregs_offset,
714 user_fpregs_offset + sizeof(new_vfp.fpregs));
715 if (ret)
716 return ret;
717
718 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
719 user_fpregs_offset + sizeof(new_vfp.fpregs),
720 user_fpscr_offset);
721 if (ret)
722 return ret;
723
724 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
725 &new_vfp.fpscr,
726 user_fpscr_offset,
727 user_fpscr_offset + sizeof(new_vfp.fpscr));
728 if (ret)
729 return ret;
730
731 thread->vfpstate.hard = new_vfp;
732 vfp_flush_hwstate(thread);
733
734 return 0;
735}
736#endif
737
738enum arm_regset {
739 REGSET_GPR,
740 REGSET_FPR,
741#ifdef CONFIG_VFP
742 REGSET_VFP,
743#endif
744};
745
746static const struct user_regset arm_regsets[] = {
747 [REGSET_GPR] = {
748 .core_note_type = NT_PRSTATUS,
749 .n = ELF_NGREG,
750 .size = sizeof(u32),
751 .align = sizeof(u32),
752 .get = gpr_get,
753 .set = gpr_set
754 },
755 [REGSET_FPR] = {
756
757
758
759
760 .core_note_type = NT_PRFPREG,
761 .n = sizeof(struct user_fp) / sizeof(u32),
762 .size = sizeof(u32),
763 .align = sizeof(u32),
764 .get = fpa_get,
765 .set = fpa_set
766 },
767#ifdef CONFIG_VFP
768 [REGSET_VFP] = {
769
770
771
772
773 .core_note_type = NT_ARM_VFP,
774 .n = ARM_VFPREGS_SIZE / sizeof(u32),
775 .size = sizeof(u32),
776 .align = sizeof(u32),
777 .get = vfp_get,
778 .set = vfp_set
779 },
780#endif
781};
782
783static const struct user_regset_view user_arm_view = {
784 .name = "arm", .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
785 .regsets = arm_regsets, .n = ARRAY_SIZE(arm_regsets)
786};
787
788const struct user_regset_view *task_user_regset_view(struct task_struct *task)
789{
790 return &user_arm_view;
791}
792
793long arch_ptrace(struct task_struct *child, long request,
794 unsigned long addr, unsigned long data)
795{
796 int ret;
797 unsigned long __user *datap = (unsigned long __user *) data;
798
799 switch (request) {
800 case PTRACE_PEEKUSR:
801 ret = ptrace_read_user(child, addr, datap);
802 break;
803
804 case PTRACE_POKEUSR:
805 ret = ptrace_write_user(child, addr, data);
806 break;
807
808 case PTRACE_GETREGS:
809 ret = copy_regset_to_user(child,
810 &user_arm_view, REGSET_GPR,
811 0, sizeof(struct pt_regs),
812 datap);
813 break;
814
815 case PTRACE_SETREGS:
816 ret = copy_regset_from_user(child,
817 &user_arm_view, REGSET_GPR,
818 0, sizeof(struct pt_regs),
819 datap);
820 break;
821
822 case PTRACE_GETFPREGS:
823 ret = copy_regset_to_user(child,
824 &user_arm_view, REGSET_FPR,
825 0, sizeof(union fp_state),
826 datap);
827 break;
828
829 case PTRACE_SETFPREGS:
830 ret = copy_regset_from_user(child,
831 &user_arm_view, REGSET_FPR,
832 0, sizeof(union fp_state),
833 datap);
834 break;
835
836#ifdef CONFIG_IWMMXT
837 case PTRACE_GETWMMXREGS:
838 ret = ptrace_getwmmxregs(child, datap);
839 break;
840
841 case PTRACE_SETWMMXREGS:
842 ret = ptrace_setwmmxregs(child, datap);
843 break;
844#endif
845
846 case PTRACE_GET_THREAD_AREA:
847 ret = put_user(task_thread_info(child)->tp_value[0],
848 datap);
849 break;
850
851 case PTRACE_SET_SYSCALL:
852 task_thread_info(child)->syscall = data;
853 ret = 0;
854 break;
855
856#ifdef CONFIG_CRUNCH
857 case PTRACE_GETCRUNCHREGS:
858 ret = ptrace_getcrunchregs(child, datap);
859 break;
860
861 case PTRACE_SETCRUNCHREGS:
862 ret = ptrace_setcrunchregs(child, datap);
863 break;
864#endif
865
866#ifdef CONFIG_VFP
867 case PTRACE_GETVFPREGS:
868 ret = copy_regset_to_user(child,
869 &user_arm_view, REGSET_VFP,
870 0, ARM_VFPREGS_SIZE,
871 datap);
872 break;
873
874 case PTRACE_SETVFPREGS:
875 ret = copy_regset_from_user(child,
876 &user_arm_view, REGSET_VFP,
877 0, ARM_VFPREGS_SIZE,
878 datap);
879 break;
880#endif
881
882#ifdef CONFIG_HAVE_HW_BREAKPOINT
883 case PTRACE_GETHBPREGS:
884 ret = ptrace_gethbpregs(child, addr,
885 (unsigned long __user *)data);
886 break;
887 case PTRACE_SETHBPREGS:
888 ret = ptrace_sethbpregs(child, addr,
889 (unsigned long __user *)data);
890 break;
891#endif
892
893 default:
894 ret = ptrace_request(child, request, addr, data);
895 break;
896 }
897
898 return ret;
899}
900
901enum ptrace_syscall_dir {
902 PTRACE_SYSCALL_ENTER = 0,
903 PTRACE_SYSCALL_EXIT,
904};
905
906static void tracehook_report_syscall(struct pt_regs *regs,
907 enum ptrace_syscall_dir dir)
908{
909 unsigned long ip;
910
911
912
913
914
915 ip = regs->ARM_ip;
916 regs->ARM_ip = dir;
917
918 if (dir == PTRACE_SYSCALL_EXIT)
919 tracehook_report_syscall_exit(regs, 0);
920 else if (tracehook_report_syscall_entry(regs))
921 current_thread_info()->syscall = -1;
922
923 regs->ARM_ip = ip;
924}
925
926asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno)
927{
928 current_thread_info()->syscall = scno;
929
930 if (test_thread_flag(TIF_SYSCALL_TRACE))
931 tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
932
933
934#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
935 if (secure_computing(NULL) == -1)
936 return -1;
937#else
938
939 secure_computing_strict(current_thread_info()->syscall);
940#endif
941
942
943 scno = current_thread_info()->syscall;
944
945 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
946 trace_sys_enter(regs, scno);
947
948 audit_syscall_entry(scno, regs->ARM_r0, regs->ARM_r1, regs->ARM_r2,
949 regs->ARM_r3);
950
951 return scno;
952}
953
954asmlinkage void syscall_trace_exit(struct pt_regs *regs)
955{
956
957
958
959
960 audit_syscall_exit(regs);
961
962
963
964
965
966
967
968 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
969 trace_sys_exit(regs, regs_return_value(regs));
970
971 if (test_thread_flag(TIF_SYSCALL_TRACE))
972 tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);
973}
974