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9#include <linux/kernel.h>
10#include <linux/sched/signal.h>
11#include <linux/sched/task_stack.h>
12#include <linux/mm.h>
13#include <linux/elf.h>
14#include <linux/smp.h>
15#include <linux/ptrace.h>
16#include <linux/user.h>
17#include <linux/security.h>
18#include <linux/init.h>
19#include <linux/signal.h>
20#include <linux/uaccess.h>
21#include <linux/perf_event.h>
22#include <linux/hw_breakpoint.h>
23#include <linux/regset.h>
24#include <linux/audit.h>
25#include <linux/tracehook.h>
26#include <linux/unistd.h>
27
28#include <asm/pgtable.h>
29#include <asm/traps.h>
30
31#define CREATE_TRACE_POINTS
32#include <trace/events/syscalls.h>
33
34#define REG_PC 15
35#define REG_PSR 16
36
37
38
39
40
41#if 0
42
43
44
45#define BREAKINST_ARM 0xef9f0001
46#define BREAKINST_THUMB 0xdf00
47#else
48
49
50
51
52
53
54
55
56#define BREAKINST_ARM 0xe7f001f0
57#define BREAKINST_THUMB 0xde01
58#endif
59
60struct pt_regs_offset {
61 const char *name;
62 int offset;
63};
64
65#define REG_OFFSET_NAME(r) \
66 {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)}
67#define REG_OFFSET_END {.name = NULL, .offset = 0}
68
69static const struct pt_regs_offset regoffset_table[] = {
70 REG_OFFSET_NAME(r0),
71 REG_OFFSET_NAME(r1),
72 REG_OFFSET_NAME(r2),
73 REG_OFFSET_NAME(r3),
74 REG_OFFSET_NAME(r4),
75 REG_OFFSET_NAME(r5),
76 REG_OFFSET_NAME(r6),
77 REG_OFFSET_NAME(r7),
78 REG_OFFSET_NAME(r8),
79 REG_OFFSET_NAME(r9),
80 REG_OFFSET_NAME(r10),
81 REG_OFFSET_NAME(fp),
82 REG_OFFSET_NAME(ip),
83 REG_OFFSET_NAME(sp),
84 REG_OFFSET_NAME(lr),
85 REG_OFFSET_NAME(pc),
86 REG_OFFSET_NAME(cpsr),
87 REG_OFFSET_NAME(ORIG_r0),
88 REG_OFFSET_END,
89};
90
91
92
93
94
95
96
97
98int regs_query_register_offset(const char *name)
99{
100 const struct pt_regs_offset *roff;
101 for (roff = regoffset_table; roff->name != NULL; roff++)
102 if (!strcmp(roff->name, name))
103 return roff->offset;
104 return -EINVAL;
105}
106
107
108
109
110
111
112
113
114const char *regs_query_register_name(unsigned int offset)
115{
116 const struct pt_regs_offset *roff;
117 for (roff = regoffset_table; roff->name != NULL; roff++)
118 if (roff->offset == offset)
119 return roff->name;
120 return NULL;
121}
122
123
124
125
126
127
128
129
130
131bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
132{
133 return ((addr & ~(THREAD_SIZE - 1)) ==
134 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
135}
136
137
138
139
140
141
142
143
144
145
146unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
147{
148 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
149 addr += n;
150 if (regs_within_kernel_stack(regs, (unsigned long)addr))
151 return *addr;
152 else
153 return 0;
154}
155
156
157
158
159
160
161
162static inline long get_user_reg(struct task_struct *task, int offset)
163{
164 return task_pt_regs(task)->uregs[offset];
165}
166
167
168
169
170
171
172
173static inline int
174put_user_reg(struct task_struct *task, int offset, long data)
175{
176 struct pt_regs newregs, *regs = task_pt_regs(task);
177 int ret = -EINVAL;
178
179 newregs = *regs;
180 newregs.uregs[offset] = data;
181
182 if (valid_user_regs(&newregs)) {
183 regs->uregs[offset] = data;
184 ret = 0;
185 }
186
187 return ret;
188}
189
190
191
192
193void ptrace_disable(struct task_struct *child)
194{
195
196}
197
198
199
200
201void ptrace_break(struct pt_regs *regs)
202{
203 force_sig_fault(SIGTRAP, TRAP_BRKPT,
204 (void __user *)instruction_pointer(regs));
205}
206
207static int break_trap(struct pt_regs *regs, unsigned int instr)
208{
209 ptrace_break(regs);
210 return 0;
211}
212
213static struct undef_hook arm_break_hook = {
214 .instr_mask = 0x0fffffff,
215 .instr_val = 0x07f001f0,
216 .cpsr_mask = PSR_T_BIT,
217 .cpsr_val = 0,
218 .fn = break_trap,
219};
220
221static struct undef_hook thumb_break_hook = {
222 .instr_mask = 0xffffffff,
223 .instr_val = 0x0000de01,
224 .cpsr_mask = PSR_T_BIT,
225 .cpsr_val = PSR_T_BIT,
226 .fn = break_trap,
227};
228
229static struct undef_hook thumb2_break_hook = {
230 .instr_mask = 0xffffffff,
231 .instr_val = 0xf7f0a000,
232 .cpsr_mask = PSR_T_BIT,
233 .cpsr_val = PSR_T_BIT,
234 .fn = break_trap,
235};
236
237static int __init ptrace_break_init(void)
238{
239 register_undef_hook(&arm_break_hook);
240 register_undef_hook(&thumb_break_hook);
241 register_undef_hook(&thumb2_break_hook);
242 return 0;
243}
244
245core_initcall(ptrace_break_init);
246
247
248
249
250
251static int ptrace_read_user(struct task_struct *tsk, unsigned long off,
252 unsigned long __user *ret)
253{
254 unsigned long tmp;
255
256 if (off & 3)
257 return -EIO;
258
259 tmp = 0;
260 if (off == PT_TEXT_ADDR)
261 tmp = tsk->mm->start_code;
262 else if (off == PT_DATA_ADDR)
263 tmp = tsk->mm->start_data;
264 else if (off == PT_TEXT_END_ADDR)
265 tmp = tsk->mm->end_code;
266 else if (off < sizeof(struct pt_regs))
267 tmp = get_user_reg(tsk, off >> 2);
268 else if (off >= sizeof(struct user))
269 return -EIO;
270
271 return put_user(tmp, ret);
272}
273
274
275
276
277
278static int ptrace_write_user(struct task_struct *tsk, unsigned long off,
279 unsigned long val)
280{
281 if (off & 3 || off >= sizeof(struct user))
282 return -EIO;
283
284 if (off >= sizeof(struct pt_regs))
285 return 0;
286
287 return put_user_reg(tsk, off >> 2, val);
288}
289
290#ifdef CONFIG_IWMMXT
291
292
293
294
295static int ptrace_getwmmxregs(struct task_struct *tsk, void __user *ufp)
296{
297 struct thread_info *thread = task_thread_info(tsk);
298
299 if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT))
300 return -ENODATA;
301 iwmmxt_task_disable(thread);
302 return copy_to_user(ufp, &thread->fpstate.iwmmxt, IWMMXT_SIZE)
303 ? -EFAULT : 0;
304}
305
306
307
308
309static int ptrace_setwmmxregs(struct task_struct *tsk, void __user *ufp)
310{
311 struct thread_info *thread = task_thread_info(tsk);
312
313 if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT))
314 return -EACCES;
315 iwmmxt_task_release(thread);
316 return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE)
317 ? -EFAULT : 0;
318}
319
320#endif
321
322#ifdef CONFIG_CRUNCH
323
324
325
326static int ptrace_getcrunchregs(struct task_struct *tsk, void __user *ufp)
327{
328 struct thread_info *thread = task_thread_info(tsk);
329
330 crunch_task_disable(thread);
331 return copy_to_user(ufp, &thread->crunchstate, CRUNCH_SIZE)
332 ? -EFAULT : 0;
333}
334
335
336
337
338static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp)
339{
340 struct thread_info *thread = task_thread_info(tsk);
341
342 crunch_task_release(thread);
343 return copy_from_user(&thread->crunchstate, ufp, CRUNCH_SIZE)
344 ? -EFAULT : 0;
345}
346#endif
347
348#ifdef CONFIG_HAVE_HW_BREAKPOINT
349
350
351
352
353
354
355
356static int ptrace_hbp_num_to_idx(long num)
357{
358 if (num < 0)
359 num = (ARM_MAX_BRP << 1) - num;
360 return (num - 1) >> 1;
361}
362
363
364
365
366
367static long ptrace_hbp_idx_to_num(int idx)
368{
369 long mid = ARM_MAX_BRP << 1;
370 long num = (idx << 1) + 1;
371 return num > mid ? mid - num : num;
372}
373
374
375
376
377static void ptrace_hbptriggered(struct perf_event *bp,
378 struct perf_sample_data *data,
379 struct pt_regs *regs)
380{
381 struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
382 long num;
383 int i;
384
385 for (i = 0; i < ARM_MAX_HBP_SLOTS; ++i)
386 if (current->thread.debug.hbp[i] == bp)
387 break;
388
389 num = (i == ARM_MAX_HBP_SLOTS) ? 0 : ptrace_hbp_idx_to_num(i);
390
391 force_sig_ptrace_errno_trap((int)num, (void __user *)(bkpt->trigger));
392}
393
394
395
396
397
398
399void clear_ptrace_hw_breakpoint(struct task_struct *tsk)
400{
401 memset(tsk->thread.debug.hbp, 0, sizeof(tsk->thread.debug.hbp));
402}
403
404
405
406
407
408void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
409{
410 int i;
411 struct thread_struct *t = &tsk->thread;
412
413 for (i = 0; i < ARM_MAX_HBP_SLOTS; i++) {
414 if (t->debug.hbp[i]) {
415 unregister_hw_breakpoint(t->debug.hbp[i]);
416 t->debug.hbp[i] = NULL;
417 }
418 }
419}
420
421static u32 ptrace_get_hbp_resource_info(void)
422{
423 u8 num_brps, num_wrps, debug_arch, wp_len;
424 u32 reg = 0;
425
426 num_brps = hw_breakpoint_slots(TYPE_INST);
427 num_wrps = hw_breakpoint_slots(TYPE_DATA);
428 debug_arch = arch_get_debug_arch();
429 wp_len = arch_get_max_wp_len();
430
431 reg |= debug_arch;
432 reg <<= 8;
433 reg |= wp_len;
434 reg <<= 8;
435 reg |= num_wrps;
436 reg <<= 8;
437 reg |= num_brps;
438
439 return reg;
440}
441
442static struct perf_event *ptrace_hbp_create(struct task_struct *tsk, int type)
443{
444 struct perf_event_attr attr;
445
446 ptrace_breakpoint_init(&attr);
447
448
449 attr.bp_addr = 0;
450 attr.bp_len = HW_BREAKPOINT_LEN_4;
451 attr.bp_type = type;
452 attr.disabled = 1;
453
454 return register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL,
455 tsk);
456}
457
458static int ptrace_gethbpregs(struct task_struct *tsk, long num,
459 unsigned long __user *data)
460{
461 u32 reg;
462 int idx, ret = 0;
463 struct perf_event *bp;
464 struct arch_hw_breakpoint_ctrl arch_ctrl;
465
466 if (num == 0) {
467 reg = ptrace_get_hbp_resource_info();
468 } else {
469 idx = ptrace_hbp_num_to_idx(num);
470 if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) {
471 ret = -EINVAL;
472 goto out;
473 }
474
475 bp = tsk->thread.debug.hbp[idx];
476 if (!bp) {
477 reg = 0;
478 goto put;
479 }
480
481 arch_ctrl = counter_arch_bp(bp)->ctrl;
482
483
484
485
486
487 while (!(arch_ctrl.len & 0x1))
488 arch_ctrl.len >>= 1;
489
490 if (num & 0x1)
491 reg = bp->attr.bp_addr;
492 else
493 reg = encode_ctrl_reg(arch_ctrl);
494 }
495
496put:
497 if (put_user(reg, data))
498 ret = -EFAULT;
499
500out:
501 return ret;
502}
503
504static int ptrace_sethbpregs(struct task_struct *tsk, long num,
505 unsigned long __user *data)
506{
507 int idx, gen_len, gen_type, implied_type, ret = 0;
508 u32 user_val;
509 struct perf_event *bp;
510 struct arch_hw_breakpoint_ctrl ctrl;
511 struct perf_event_attr attr;
512
513 if (num == 0)
514 goto out;
515 else if (num < 0)
516 implied_type = HW_BREAKPOINT_RW;
517 else
518 implied_type = HW_BREAKPOINT_X;
519
520 idx = ptrace_hbp_num_to_idx(num);
521 if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) {
522 ret = -EINVAL;
523 goto out;
524 }
525
526 if (get_user(user_val, data)) {
527 ret = -EFAULT;
528 goto out;
529 }
530
531 bp = tsk->thread.debug.hbp[idx];
532 if (!bp) {
533 bp = ptrace_hbp_create(tsk, implied_type);
534 if (IS_ERR(bp)) {
535 ret = PTR_ERR(bp);
536 goto out;
537 }
538 tsk->thread.debug.hbp[idx] = bp;
539 }
540
541 attr = bp->attr;
542
543 if (num & 0x1) {
544
545 attr.bp_addr = user_val;
546 } else {
547
548 decode_ctrl_reg(user_val, &ctrl);
549 ret = arch_bp_generic_fields(ctrl, &gen_len, &gen_type);
550 if (ret)
551 goto out;
552
553 if ((gen_type & implied_type) != gen_type) {
554 ret = -EINVAL;
555 goto out;
556 }
557
558 attr.bp_len = gen_len;
559 attr.bp_type = gen_type;
560 attr.disabled = !ctrl.enabled;
561 }
562
563 ret = modify_user_hw_breakpoint(bp, &attr);
564out:
565 return ret;
566}
567#endif
568
569
570
571static int gpr_get(struct task_struct *target,
572 const struct user_regset *regset,
573 unsigned int pos, unsigned int count,
574 void *kbuf, void __user *ubuf)
575{
576 struct pt_regs *regs = task_pt_regs(target);
577
578 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
579 regs,
580 0, sizeof(*regs));
581}
582
583static int gpr_set(struct task_struct *target,
584 const struct user_regset *regset,
585 unsigned int pos, unsigned int count,
586 const void *kbuf, const void __user *ubuf)
587{
588 int ret;
589 struct pt_regs newregs = *task_pt_regs(target);
590
591 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
592 &newregs,
593 0, sizeof(newregs));
594 if (ret)
595 return ret;
596
597 if (!valid_user_regs(&newregs))
598 return -EINVAL;
599
600 *task_pt_regs(target) = newregs;
601 return 0;
602}
603
604static int fpa_get(struct task_struct *target,
605 const struct user_regset *regset,
606 unsigned int pos, unsigned int count,
607 void *kbuf, void __user *ubuf)
608{
609 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
610 &task_thread_info(target)->fpstate,
611 0, sizeof(struct user_fp));
612}
613
614static int fpa_set(struct task_struct *target,
615 const struct user_regset *regset,
616 unsigned int pos, unsigned int count,
617 const void *kbuf, const void __user *ubuf)
618{
619 struct thread_info *thread = task_thread_info(target);
620
621 thread->used_cp[1] = thread->used_cp[2] = 1;
622
623 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
624 &thread->fpstate,
625 0, sizeof(struct user_fp));
626}
627
628#ifdef CONFIG_VFP
629
630
631
632
633
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635
636
637
638
639
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641
642
643
644
645
646
647
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649
650
651static int vfp_get(struct task_struct *target,
652 const struct user_regset *regset,
653 unsigned int pos, unsigned int count,
654 void *kbuf, void __user *ubuf)
655{
656 int ret;
657 struct thread_info *thread = task_thread_info(target);
658 struct vfp_hard_struct const *vfp = &thread->vfpstate.hard;
659 const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs);
660 const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr);
661
662 vfp_sync_hwstate(thread);
663
664 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
665 &vfp->fpregs,
666 user_fpregs_offset,
667 user_fpregs_offset + sizeof(vfp->fpregs));
668 if (ret)
669 return ret;
670
671 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
672 user_fpregs_offset + sizeof(vfp->fpregs),
673 user_fpscr_offset);
674 if (ret)
675 return ret;
676
677 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
678 &vfp->fpscr,
679 user_fpscr_offset,
680 user_fpscr_offset + sizeof(vfp->fpscr));
681}
682
683
684
685
686
687
688static int vfp_set(struct task_struct *target,
689 const struct user_regset *regset,
690 unsigned int pos, unsigned int count,
691 const void *kbuf, const void __user *ubuf)
692{
693 int ret;
694 struct thread_info *thread = task_thread_info(target);
695 struct vfp_hard_struct new_vfp;
696 const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs);
697 const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr);
698
699 vfp_sync_hwstate(thread);
700 new_vfp = thread->vfpstate.hard;
701
702 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
703 &new_vfp.fpregs,
704 user_fpregs_offset,
705 user_fpregs_offset + sizeof(new_vfp.fpregs));
706 if (ret)
707 return ret;
708
709 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
710 user_fpregs_offset + sizeof(new_vfp.fpregs),
711 user_fpscr_offset);
712 if (ret)
713 return ret;
714
715 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
716 &new_vfp.fpscr,
717 user_fpscr_offset,
718 user_fpscr_offset + sizeof(new_vfp.fpscr));
719 if (ret)
720 return ret;
721
722 thread->vfpstate.hard = new_vfp;
723 vfp_flush_hwstate(thread);
724
725 return 0;
726}
727#endif
728
729enum arm_regset {
730 REGSET_GPR,
731 REGSET_FPR,
732#ifdef CONFIG_VFP
733 REGSET_VFP,
734#endif
735};
736
737static const struct user_regset arm_regsets[] = {
738 [REGSET_GPR] = {
739 .core_note_type = NT_PRSTATUS,
740 .n = ELF_NGREG,
741 .size = sizeof(u32),
742 .align = sizeof(u32),
743 .get = gpr_get,
744 .set = gpr_set
745 },
746 [REGSET_FPR] = {
747
748
749
750
751 .core_note_type = NT_PRFPREG,
752 .n = sizeof(struct user_fp) / sizeof(u32),
753 .size = sizeof(u32),
754 .align = sizeof(u32),
755 .get = fpa_get,
756 .set = fpa_set
757 },
758#ifdef CONFIG_VFP
759 [REGSET_VFP] = {
760
761
762
763
764 .core_note_type = NT_ARM_VFP,
765 .n = ARM_VFPREGS_SIZE / sizeof(u32),
766 .size = sizeof(u32),
767 .align = sizeof(u32),
768 .get = vfp_get,
769 .set = vfp_set
770 },
771#endif
772};
773
774static const struct user_regset_view user_arm_view = {
775 .name = "arm", .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
776 .regsets = arm_regsets, .n = ARRAY_SIZE(arm_regsets)
777};
778
779const struct user_regset_view *task_user_regset_view(struct task_struct *task)
780{
781 return &user_arm_view;
782}
783
784long arch_ptrace(struct task_struct *child, long request,
785 unsigned long addr, unsigned long data)
786{
787 int ret;
788 unsigned long __user *datap = (unsigned long __user *) data;
789
790 switch (request) {
791 case PTRACE_PEEKUSR:
792 ret = ptrace_read_user(child, addr, datap);
793 break;
794
795 case PTRACE_POKEUSR:
796 ret = ptrace_write_user(child, addr, data);
797 break;
798
799 case PTRACE_GETREGS:
800 ret = copy_regset_to_user(child,
801 &user_arm_view, REGSET_GPR,
802 0, sizeof(struct pt_regs),
803 datap);
804 break;
805
806 case PTRACE_SETREGS:
807 ret = copy_regset_from_user(child,
808 &user_arm_view, REGSET_GPR,
809 0, sizeof(struct pt_regs),
810 datap);
811 break;
812
813 case PTRACE_GETFPREGS:
814 ret = copy_regset_to_user(child,
815 &user_arm_view, REGSET_FPR,
816 0, sizeof(union fp_state),
817 datap);
818 break;
819
820 case PTRACE_SETFPREGS:
821 ret = copy_regset_from_user(child,
822 &user_arm_view, REGSET_FPR,
823 0, sizeof(union fp_state),
824 datap);
825 break;
826
827#ifdef CONFIG_IWMMXT
828 case PTRACE_GETWMMXREGS:
829 ret = ptrace_getwmmxregs(child, datap);
830 break;
831
832 case PTRACE_SETWMMXREGS:
833 ret = ptrace_setwmmxregs(child, datap);
834 break;
835#endif
836
837 case PTRACE_GET_THREAD_AREA:
838 ret = put_user(task_thread_info(child)->tp_value[0],
839 datap);
840 break;
841
842 case PTRACE_SET_SYSCALL:
843 task_thread_info(child)->syscall = data;
844 ret = 0;
845 break;
846
847#ifdef CONFIG_CRUNCH
848 case PTRACE_GETCRUNCHREGS:
849 ret = ptrace_getcrunchregs(child, datap);
850 break;
851
852 case PTRACE_SETCRUNCHREGS:
853 ret = ptrace_setcrunchregs(child, datap);
854 break;
855#endif
856
857#ifdef CONFIG_VFP
858 case PTRACE_GETVFPREGS:
859 ret = copy_regset_to_user(child,
860 &user_arm_view, REGSET_VFP,
861 0, ARM_VFPREGS_SIZE,
862 datap);
863 break;
864
865 case PTRACE_SETVFPREGS:
866 ret = copy_regset_from_user(child,
867 &user_arm_view, REGSET_VFP,
868 0, ARM_VFPREGS_SIZE,
869 datap);
870 break;
871#endif
872
873#ifdef CONFIG_HAVE_HW_BREAKPOINT
874 case PTRACE_GETHBPREGS:
875 ret = ptrace_gethbpregs(child, addr,
876 (unsigned long __user *)data);
877 break;
878 case PTRACE_SETHBPREGS:
879 ret = ptrace_sethbpregs(child, addr,
880 (unsigned long __user *)data);
881 break;
882#endif
883
884 default:
885 ret = ptrace_request(child, request, addr, data);
886 break;
887 }
888
889 return ret;
890}
891
892enum ptrace_syscall_dir {
893 PTRACE_SYSCALL_ENTER = 0,
894 PTRACE_SYSCALL_EXIT,
895};
896
897static void tracehook_report_syscall(struct pt_regs *regs,
898 enum ptrace_syscall_dir dir)
899{
900 unsigned long ip;
901
902
903
904
905
906 ip = regs->ARM_ip;
907 regs->ARM_ip = dir;
908
909 if (dir == PTRACE_SYSCALL_EXIT)
910 tracehook_report_syscall_exit(regs, 0);
911 else if (tracehook_report_syscall_entry(regs))
912 current_thread_info()->syscall = -1;
913
914 regs->ARM_ip = ip;
915}
916
917asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno)
918{
919 current_thread_info()->syscall = scno;
920
921 if (test_thread_flag(TIF_SYSCALL_TRACE))
922 tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
923
924
925#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
926 if (secure_computing() == -1)
927 return -1;
928#else
929
930 secure_computing_strict(current_thread_info()->syscall);
931#endif
932
933
934 scno = current_thread_info()->syscall;
935
936 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
937 trace_sys_enter(regs, scno);
938
939 audit_syscall_entry(scno, regs->ARM_r0, regs->ARM_r1, regs->ARM_r2,
940 regs->ARM_r3);
941
942 return scno;
943}
944
945asmlinkage void syscall_trace_exit(struct pt_regs *regs)
946{
947
948
949
950
951 audit_syscall_exit(regs);
952
953
954
955
956
957
958
959 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
960 trace_sys_exit(regs, regs_return_value(regs));
961
962 if (test_thread_flag(TIF_SYSCALL_TRACE))
963 tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);
964}
965