2 * Based on arch/arm/kernel/ptrace.c
5 * edited by Linus Torvalds
6 * ARM modifications Copyright (C) 2000 Russell King
7 * Copyright (C) 2012 ARM Ltd.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include <linux/compat.h>
23 #include <linux/kernel.h>
24 #include <linux/sched.h>
26 #include <linux/smp.h>
27 #include <linux/ptrace.h>
28 #include <linux/user.h>
29 #include <linux/security.h>
30 #include <linux/init.h>
31 #include <linux/signal.h>
32 #include <linux/uaccess.h>
33 #include <linux/perf_event.h>
34 #include <linux/hw_breakpoint.h>
35 #include <linux/regset.h>
36 #include <linux/tracehook.h>
37 #include <linux/elf.h>
39 #include <asm/compat.h>
40 #include <asm/debug-monitors.h>
41 #include <asm/pgtable.h>
42 #include <asm/traps.h>
43 #include <asm/system_misc.h>
45 #define CREATE_TRACE_POINTS
46 #include <trace/events/syscalls.h>
49 * TODO: does not yet catch signals sent when the child dies.
50 * in exit.c or in signal.c.
54 * Called by kernel/ptrace.c when detaching..
56 void ptrace_disable(struct task_struct *child)
60 #ifdef CONFIG_HAVE_HW_BREAKPOINT
62 * Handle hitting a HW-breakpoint.
64 static void ptrace_hbptriggered(struct perf_event *bp,
65 struct perf_sample_data *data,
68 struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
72 .si_code = TRAP_HWBKPT,
73 .si_addr = (void __user *)(bkpt->trigger),
79 if (!is_compat_task())
82 for (i = 0; i < ARM_MAX_BRP; ++i) {
83 if (current->thread.debug.hbp_break[i] == bp) {
84 info.si_errno = (i << 1) + 1;
88 for (i = ARM_MAX_BRP; i < ARM_MAX_HBP_SLOTS && !bp; ++i) {
89 if (current->thread.debug.hbp_watch[i] == bp) {
90 info.si_errno = -((i << 1) + 1);
97 force_sig_info(SIGTRAP, &info, current);
101 * Unregister breakpoints from this task and reset the pointers in
104 void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
107 struct thread_struct *t = &tsk->thread;
109 for (i = 0; i < ARM_MAX_BRP; i++) {
110 if (t->debug.hbp_break[i]) {
111 unregister_hw_breakpoint(t->debug.hbp_break[i]);
112 t->debug.hbp_break[i] = NULL;
116 for (i = 0; i < ARM_MAX_WRP; i++) {
117 if (t->debug.hbp_watch[i]) {
118 unregister_hw_breakpoint(t->debug.hbp_watch[i]);
119 t->debug.hbp_watch[i] = NULL;
124 void ptrace_hw_copy_thread(struct task_struct *tsk)
126 memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
129 static struct perf_event *ptrace_hbp_get_event(unsigned int note_type,
130 struct task_struct *tsk,
133 struct perf_event *bp = ERR_PTR(-EINVAL);
136 case NT_ARM_HW_BREAK:
137 if (idx < ARM_MAX_BRP)
138 bp = tsk->thread.debug.hbp_break[idx];
140 case NT_ARM_HW_WATCH:
141 if (idx < ARM_MAX_WRP)
142 bp = tsk->thread.debug.hbp_watch[idx];
149 static int ptrace_hbp_set_event(unsigned int note_type,
150 struct task_struct *tsk,
152 struct perf_event *bp)
157 case NT_ARM_HW_BREAK:
158 if (idx < ARM_MAX_BRP) {
159 tsk->thread.debug.hbp_break[idx] = bp;
163 case NT_ARM_HW_WATCH:
164 if (idx < ARM_MAX_WRP) {
165 tsk->thread.debug.hbp_watch[idx] = bp;
174 static struct perf_event *ptrace_hbp_create(unsigned int note_type,
175 struct task_struct *tsk,
178 struct perf_event *bp;
179 struct perf_event_attr attr;
183 case NT_ARM_HW_BREAK:
184 type = HW_BREAKPOINT_X;
186 case NT_ARM_HW_WATCH:
187 type = HW_BREAKPOINT_RW;
190 return ERR_PTR(-EINVAL);
193 ptrace_breakpoint_init(&attr);
196 * Initialise fields to sane defaults
197 * (i.e. values that will pass validation).
200 attr.bp_len = HW_BREAKPOINT_LEN_4;
204 bp = register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, tsk);
208 err = ptrace_hbp_set_event(note_type, tsk, idx, bp);
215 static int ptrace_hbp_fill_attr_ctrl(unsigned int note_type,
216 struct arch_hw_breakpoint_ctrl ctrl,
217 struct perf_event_attr *attr)
219 int err, len, type, disabled = !ctrl.enabled;
221 attr->disabled = disabled;
225 err = arch_bp_generic_fields(ctrl, &len, &type);
230 case NT_ARM_HW_BREAK:
231 if ((type & HW_BREAKPOINT_X) != type)
234 case NT_ARM_HW_WATCH:
235 if ((type & HW_BREAKPOINT_RW) != type)
243 attr->bp_type = type;
248 static int ptrace_hbp_get_resource_info(unsigned int note_type, u32 *info)
254 case NT_ARM_HW_BREAK:
255 num = hw_breakpoint_slots(TYPE_INST);
257 case NT_ARM_HW_WATCH:
258 num = hw_breakpoint_slots(TYPE_DATA);
264 reg |= debug_monitors_arch();
272 static int ptrace_hbp_get_ctrl(unsigned int note_type,
273 struct task_struct *tsk,
277 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
282 *ctrl = bp ? encode_ctrl_reg(counter_arch_bp(bp)->ctrl) : 0;
286 static int ptrace_hbp_get_addr(unsigned int note_type,
287 struct task_struct *tsk,
291 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
296 *addr = bp ? bp->attr.bp_addr : 0;
300 static struct perf_event *ptrace_hbp_get_initialised_bp(unsigned int note_type,
301 struct task_struct *tsk,
304 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
307 bp = ptrace_hbp_create(note_type, tsk, idx);
312 static int ptrace_hbp_set_ctrl(unsigned int note_type,
313 struct task_struct *tsk,
318 struct perf_event *bp;
319 struct perf_event_attr attr;
320 struct arch_hw_breakpoint_ctrl ctrl;
322 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
329 decode_ctrl_reg(uctrl, &ctrl);
330 err = ptrace_hbp_fill_attr_ctrl(note_type, ctrl, &attr);
334 return modify_user_hw_breakpoint(bp, &attr);
337 static int ptrace_hbp_set_addr(unsigned int note_type,
338 struct task_struct *tsk,
343 struct perf_event *bp;
344 struct perf_event_attr attr;
346 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
354 err = modify_user_hw_breakpoint(bp, &attr);
358 #define PTRACE_HBP_ADDR_SZ sizeof(u64)
359 #define PTRACE_HBP_CTRL_SZ sizeof(u32)
360 #define PTRACE_HBP_PAD_SZ sizeof(u32)
362 static int hw_break_get(struct task_struct *target,
363 const struct user_regset *regset,
364 unsigned int pos, unsigned int count,
365 void *kbuf, void __user *ubuf)
367 unsigned int note_type = regset->core_note_type;
368 int ret, idx = 0, offset, limit;
373 ret = ptrace_hbp_get_resource_info(note_type, &info);
377 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0,
383 offset = offsetof(struct user_hwdebug_state, pad);
384 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, offset,
385 offset + PTRACE_HBP_PAD_SZ);
389 /* (address, ctrl) registers */
390 offset = offsetof(struct user_hwdebug_state, dbg_regs);
391 limit = regset->n * regset->size;
392 while (count && offset < limit) {
393 ret = ptrace_hbp_get_addr(note_type, target, idx, &addr);
396 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &addr,
397 offset, offset + PTRACE_HBP_ADDR_SZ);
400 offset += PTRACE_HBP_ADDR_SZ;
402 ret = ptrace_hbp_get_ctrl(note_type, target, idx, &ctrl);
405 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &ctrl,
406 offset, offset + PTRACE_HBP_CTRL_SZ);
409 offset += PTRACE_HBP_CTRL_SZ;
411 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
413 offset + PTRACE_HBP_PAD_SZ);
416 offset += PTRACE_HBP_PAD_SZ;
423 static int hw_break_set(struct task_struct *target,
424 const struct user_regset *regset,
425 unsigned int pos, unsigned int count,
426 const void *kbuf, const void __user *ubuf)
428 unsigned int note_type = regset->core_note_type;
429 int ret, idx = 0, offset, limit;
433 /* Resource info and pad */
434 offset = offsetof(struct user_hwdebug_state, dbg_regs);
435 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
439 /* (address, ctrl) registers */
440 limit = regset->n * regset->size;
441 while (count && offset < limit) {
442 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
443 offset, offset + PTRACE_HBP_ADDR_SZ);
446 ret = ptrace_hbp_set_addr(note_type, target, idx, addr);
449 offset += PTRACE_HBP_ADDR_SZ;
451 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
452 offset, offset + PTRACE_HBP_CTRL_SZ);
455 ret = ptrace_hbp_set_ctrl(note_type, target, idx, ctrl);
458 offset += PTRACE_HBP_CTRL_SZ;
460 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
462 offset + PTRACE_HBP_PAD_SZ);
465 offset += PTRACE_HBP_PAD_SZ;
471 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
473 static int gpr_get(struct task_struct *target,
474 const struct user_regset *regset,
475 unsigned int pos, unsigned int count,
476 void *kbuf, void __user *ubuf)
478 struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
479 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
482 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
483 unsigned int pos, unsigned int count,
484 const void *kbuf, const void __user *ubuf)
487 struct user_pt_regs newregs;
489 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
493 if (!valid_user_regs(&newregs))
496 task_pt_regs(target)->user_regs = newregs;
501 * TODO: update fp accessors for lazy context switching (sync/flush hwstate)
503 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
504 unsigned int pos, unsigned int count,
505 void *kbuf, void __user *ubuf)
507 struct user_fpsimd_state *uregs;
508 uregs = &target->thread.fpsimd_state.user_fpsimd;
509 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
512 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
513 unsigned int pos, unsigned int count,
514 const void *kbuf, const void __user *ubuf)
517 struct user_fpsimd_state newstate;
519 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
523 target->thread.fpsimd_state.user_fpsimd = newstate;
524 fpsimd_flush_task_state(target);
528 static int tls_get(struct task_struct *target, const struct user_regset *regset,
529 unsigned int pos, unsigned int count,
530 void *kbuf, void __user *ubuf)
532 unsigned long *tls = &target->thread.tp_value;
533 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, tls, 0, -1);
536 static int tls_set(struct task_struct *target, const struct user_regset *regset,
537 unsigned int pos, unsigned int count,
538 const void *kbuf, const void __user *ubuf)
543 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
547 target->thread.tp_value = tls;
551 enum aarch64_regset {
555 #ifdef CONFIG_HAVE_HW_BREAKPOINT
561 static const struct user_regset aarch64_regsets[] = {
563 .core_note_type = NT_PRSTATUS,
564 .n = sizeof(struct user_pt_regs) / sizeof(u64),
566 .align = sizeof(u64),
571 .core_note_type = NT_PRFPREG,
572 .n = sizeof(struct user_fpsimd_state) / sizeof(u32),
574 * We pretend we have 32-bit registers because the fpsr and
575 * fpcr are 32-bits wide.
578 .align = sizeof(u32),
583 .core_note_type = NT_ARM_TLS,
585 .size = sizeof(void *),
586 .align = sizeof(void *),
590 #ifdef CONFIG_HAVE_HW_BREAKPOINT
591 [REGSET_HW_BREAK] = {
592 .core_note_type = NT_ARM_HW_BREAK,
593 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
595 .align = sizeof(u32),
599 [REGSET_HW_WATCH] = {
600 .core_note_type = NT_ARM_HW_WATCH,
601 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
603 .align = sizeof(u32),
610 static const struct user_regset_view user_aarch64_view = {
611 .name = "aarch64", .e_machine = EM_AARCH64,
612 .regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets)
616 #include <linux/compat.h>
623 static int compat_gpr_get(struct task_struct *target,
624 const struct user_regset *regset,
625 unsigned int pos, unsigned int count,
626 void *kbuf, void __user *ubuf)
629 unsigned int i, start, num_regs;
631 /* Calculate the number of AArch32 registers contained in count */
632 num_regs = count / regset->size;
634 /* Convert pos into an register number */
635 start = pos / regset->size;
637 if (start + num_regs > regset->n)
640 for (i = 0; i < num_regs; ++i) {
641 unsigned int idx = start + i;
646 reg = task_pt_regs(target)->pc;
649 reg = task_pt_regs(target)->pstate;
652 reg = task_pt_regs(target)->orig_x0;
655 reg = task_pt_regs(target)->regs[idx];
659 memcpy(kbuf, ®, sizeof(reg));
662 ret = copy_to_user(ubuf, ®, sizeof(reg));
673 static int compat_gpr_set(struct task_struct *target,
674 const struct user_regset *regset,
675 unsigned int pos, unsigned int count,
676 const void *kbuf, const void __user *ubuf)
678 struct pt_regs newregs;
680 unsigned int i, start, num_regs;
682 /* Calculate the number of AArch32 registers contained in count */
683 num_regs = count / regset->size;
685 /* Convert pos into an register number */
686 start = pos / regset->size;
688 if (start + num_regs > regset->n)
691 newregs = *task_pt_regs(target);
693 for (i = 0; i < num_regs; ++i) {
694 unsigned int idx = start + i;
698 memcpy(®, kbuf, sizeof(reg));
701 ret = copy_from_user(®, ubuf, sizeof(reg));
713 newregs.pstate = reg;
716 newregs.orig_x0 = reg;
719 newregs.regs[idx] = reg;
724 if (valid_user_regs(&newregs.user_regs))
725 *task_pt_regs(target) = newregs;
732 static int compat_vfp_get(struct task_struct *target,
733 const struct user_regset *regset,
734 unsigned int pos, unsigned int count,
735 void *kbuf, void __user *ubuf)
737 struct user_fpsimd_state *uregs;
738 compat_ulong_t fpscr;
741 uregs = &target->thread.fpsimd_state.user_fpsimd;
744 * The VFP registers are packed into the fpsimd_state, so they all sit
745 * nicely together for us. We just need to create the fpscr separately.
747 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
748 VFP_STATE_SIZE - sizeof(compat_ulong_t));
751 fpscr = (uregs->fpsr & VFP_FPSCR_STAT_MASK) |
752 (uregs->fpcr & VFP_FPSCR_CTRL_MASK);
753 ret = put_user(fpscr, (compat_ulong_t *)ubuf);
759 static int compat_vfp_set(struct task_struct *target,
760 const struct user_regset *regset,
761 unsigned int pos, unsigned int count,
762 const void *kbuf, const void __user *ubuf)
764 struct user_fpsimd_state *uregs;
765 compat_ulong_t fpscr;
768 if (pos + count > VFP_STATE_SIZE)
771 uregs = &target->thread.fpsimd_state.user_fpsimd;
773 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
774 VFP_STATE_SIZE - sizeof(compat_ulong_t));
777 ret = get_user(fpscr, (compat_ulong_t *)ubuf);
778 uregs->fpsr = fpscr & VFP_FPSCR_STAT_MASK;
779 uregs->fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
782 fpsimd_flush_task_state(target);
786 static const struct user_regset aarch32_regsets[] = {
787 [REGSET_COMPAT_GPR] = {
788 .core_note_type = NT_PRSTATUS,
789 .n = COMPAT_ELF_NGREG,
790 .size = sizeof(compat_elf_greg_t),
791 .align = sizeof(compat_elf_greg_t),
792 .get = compat_gpr_get,
793 .set = compat_gpr_set
795 [REGSET_COMPAT_VFP] = {
796 .core_note_type = NT_ARM_VFP,
797 .n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
798 .size = sizeof(compat_ulong_t),
799 .align = sizeof(compat_ulong_t),
800 .get = compat_vfp_get,
801 .set = compat_vfp_set
805 static const struct user_regset_view user_aarch32_view = {
806 .name = "aarch32", .e_machine = EM_ARM,
807 .regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets)
810 static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
811 compat_ulong_t __user *ret)
818 if (off == COMPAT_PT_TEXT_ADDR)
819 tmp = tsk->mm->start_code;
820 else if (off == COMPAT_PT_DATA_ADDR)
821 tmp = tsk->mm->start_data;
822 else if (off == COMPAT_PT_TEXT_END_ADDR)
823 tmp = tsk->mm->end_code;
824 else if (off < sizeof(compat_elf_gregset_t))
825 return copy_regset_to_user(tsk, &user_aarch32_view,
826 REGSET_COMPAT_GPR, off,
827 sizeof(compat_ulong_t), ret);
828 else if (off >= COMPAT_USER_SZ)
833 return put_user(tmp, ret);
836 static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off,
840 mm_segment_t old_fs = get_fs();
842 if (off & 3 || off >= COMPAT_USER_SZ)
845 if (off >= sizeof(compat_elf_gregset_t))
849 ret = copy_regset_from_user(tsk, &user_aarch32_view,
850 REGSET_COMPAT_GPR, off,
851 sizeof(compat_ulong_t),
858 #ifdef CONFIG_HAVE_HW_BREAKPOINT
861 * Convert a virtual register number into an index for a thread_info
862 * breakpoint array. Breakpoints are identified using positive numbers
863 * whilst watchpoints are negative. The registers are laid out as pairs
864 * of (address, control), each pair mapping to a unique hw_breakpoint struct.
865 * Register 0 is reserved for describing resource information.
867 static int compat_ptrace_hbp_num_to_idx(compat_long_t num)
869 return (abs(num) - 1) >> 1;
872 static int compat_ptrace_hbp_get_resource_info(u32 *kdata)
874 u8 num_brps, num_wrps, debug_arch, wp_len;
877 num_brps = hw_breakpoint_slots(TYPE_INST);
878 num_wrps = hw_breakpoint_slots(TYPE_DATA);
880 debug_arch = debug_monitors_arch();
894 static int compat_ptrace_hbp_get(unsigned int note_type,
895 struct task_struct *tsk,
902 int err, idx = compat_ptrace_hbp_num_to_idx(num);;
905 err = ptrace_hbp_get_addr(note_type, tsk, idx, &addr);
908 err = ptrace_hbp_get_ctrl(note_type, tsk, idx, &ctrl);
915 static int compat_ptrace_hbp_set(unsigned int note_type,
916 struct task_struct *tsk,
923 int err, idx = compat_ptrace_hbp_num_to_idx(num);
927 err = ptrace_hbp_set_addr(note_type, tsk, idx, addr);
930 err = ptrace_hbp_set_ctrl(note_type, tsk, idx, ctrl);
936 static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
937 compat_ulong_t __user *data)
941 mm_segment_t old_fs = get_fs();
946 ret = compat_ptrace_hbp_get(NT_ARM_HW_WATCH, tsk, num, &kdata);
948 } else if (num == 0) {
949 ret = compat_ptrace_hbp_get_resource_info(&kdata);
952 ret = compat_ptrace_hbp_get(NT_ARM_HW_BREAK, tsk, num, &kdata);
957 ret = put_user(kdata, data);
962 static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
963 compat_ulong_t __user *data)
967 mm_segment_t old_fs = get_fs();
972 ret = get_user(kdata, data);
978 ret = compat_ptrace_hbp_set(NT_ARM_HW_WATCH, tsk, num, &kdata);
980 ret = compat_ptrace_hbp_set(NT_ARM_HW_BREAK, tsk, num, &kdata);
985 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
987 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
988 compat_ulong_t caddr, compat_ulong_t cdata)
990 unsigned long addr = caddr;
991 unsigned long data = cdata;
992 void __user *datap = compat_ptr(data);
997 ret = compat_ptrace_read_user(child, addr, datap);
1000 case PTRACE_POKEUSR:
1001 ret = compat_ptrace_write_user(child, addr, data);
1004 case COMPAT_PTRACE_GETREGS:
1005 ret = copy_regset_to_user(child,
1008 0, sizeof(compat_elf_gregset_t),
1012 case COMPAT_PTRACE_SETREGS:
1013 ret = copy_regset_from_user(child,
1016 0, sizeof(compat_elf_gregset_t),
1020 case COMPAT_PTRACE_GET_THREAD_AREA:
1021 ret = put_user((compat_ulong_t)child->thread.tp_value,
1022 (compat_ulong_t __user *)datap);
1025 case COMPAT_PTRACE_SET_SYSCALL:
1026 task_pt_regs(child)->syscallno = data;
1030 case COMPAT_PTRACE_GETVFPREGS:
1031 ret = copy_regset_to_user(child,
1038 case COMPAT_PTRACE_SETVFPREGS:
1039 ret = copy_regset_from_user(child,
1046 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1047 case COMPAT_PTRACE_GETHBPREGS:
1048 ret = compat_ptrace_gethbpregs(child, addr, datap);
1051 case COMPAT_PTRACE_SETHBPREGS:
1052 ret = compat_ptrace_sethbpregs(child, addr, datap);
1057 ret = compat_ptrace_request(child, request, addr,
1064 #endif /* CONFIG_COMPAT */
1066 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1068 #ifdef CONFIG_COMPAT
1069 if (is_compat_thread(task_thread_info(task)))
1070 return &user_aarch32_view;
1072 return &user_aarch64_view;
1075 long arch_ptrace(struct task_struct *child, long request,
1076 unsigned long addr, unsigned long data)
1078 return ptrace_request(child, request, addr, data);
1081 enum ptrace_syscall_dir {
1082 PTRACE_SYSCALL_ENTER = 0,
1083 PTRACE_SYSCALL_EXIT,
1086 static void tracehook_report_syscall(struct pt_regs *regs,
1087 enum ptrace_syscall_dir dir)
1090 unsigned long saved_reg;
1093 * A scratch register (ip(r12) on AArch32, x7 on AArch64) is
1094 * used to denote syscall entry/exit:
1096 regno = (is_compat_task() ? 12 : 7);
1097 saved_reg = regs->regs[regno];
1098 regs->regs[regno] = dir;
1100 if (dir == PTRACE_SYSCALL_EXIT)
1101 tracehook_report_syscall_exit(regs, 0);
1102 else if (tracehook_report_syscall_entry(regs))
1103 regs->syscallno = ~0UL;
1105 regs->regs[regno] = saved_reg;
1108 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1110 if (test_thread_flag(TIF_SYSCALL_TRACE))
1111 tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
1113 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
1114 trace_sys_enter(regs, regs->syscallno);
1116 return regs->syscallno;
1119 asmlinkage void syscall_trace_exit(struct pt_regs *regs)
1121 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
1122 trace_sys_exit(regs, regs_return_value(regs));
1124 if (test_thread_flag(TIF_SYSCALL_TRACE))
1125 tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);