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/kernel.h>
23 #include <linux/sched.h>
25 #include <linux/smp.h>
26 #include <linux/ptrace.h>
27 #include <linux/user.h>
28 #include <linux/security.h>
29 #include <linux/init.h>
30 #include <linux/signal.h>
31 #include <linux/uaccess.h>
32 #include <linux/perf_event.h>
33 #include <linux/hw_breakpoint.h>
34 #include <linux/regset.h>
35 #include <linux/tracehook.h>
36 #include <linux/elf.h>
38 #include <asm/compat.h>
39 #include <asm/debug-monitors.h>
40 #include <asm/pgtable.h>
41 #include <asm/traps.h>
42 #include <asm/system_misc.h>
45 * TODO: does not yet catch signals sent when the child dies.
46 * in exit.c or in signal.c.
50 * Called by kernel/ptrace.c when detaching..
52 void ptrace_disable(struct task_struct *child)
57 * Handle hitting a breakpoint.
59 static int ptrace_break(struct pt_regs *regs)
64 .si_code = TRAP_BRKPT,
65 .si_addr = (void __user *)instruction_pointer(regs),
68 force_sig_info(SIGTRAP, &info, current);
72 static int arm64_break_trap(unsigned long addr, unsigned int esr,
75 return ptrace_break(regs);
78 #ifdef CONFIG_HAVE_HW_BREAKPOINT
80 * Handle hitting a HW-breakpoint.
82 static void ptrace_hbptriggered(struct perf_event *bp,
83 struct perf_sample_data *data,
86 struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
90 .si_code = TRAP_HWBKPT,
91 .si_addr = (void __user *)(bkpt->trigger),
97 if (!is_compat_task())
100 for (i = 0; i < ARM_MAX_BRP; ++i) {
101 if (current->thread.debug.hbp_break[i] == bp) {
102 info.si_errno = (i << 1) + 1;
106 for (i = ARM_MAX_BRP; i < ARM_MAX_HBP_SLOTS && !bp; ++i) {
107 if (current->thread.debug.hbp_watch[i] == bp) {
108 info.si_errno = -((i << 1) + 1);
115 force_sig_info(SIGTRAP, &info, current);
119 * Unregister breakpoints from this task and reset the pointers in
122 void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
125 struct thread_struct *t = &tsk->thread;
127 for (i = 0; i < ARM_MAX_BRP; i++) {
128 if (t->debug.hbp_break[i]) {
129 unregister_hw_breakpoint(t->debug.hbp_break[i]);
130 t->debug.hbp_break[i] = NULL;
134 for (i = 0; i < ARM_MAX_WRP; i++) {
135 if (t->debug.hbp_watch[i]) {
136 unregister_hw_breakpoint(t->debug.hbp_watch[i]);
137 t->debug.hbp_watch[i] = NULL;
142 void ptrace_hw_copy_thread(struct task_struct *tsk)
144 memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
147 static struct perf_event *ptrace_hbp_get_event(unsigned int note_type,
148 struct task_struct *tsk,
151 struct perf_event *bp = ERR_PTR(-EINVAL);
154 case NT_ARM_HW_BREAK:
155 if (idx < ARM_MAX_BRP)
156 bp = tsk->thread.debug.hbp_break[idx];
158 case NT_ARM_HW_WATCH:
159 if (idx < ARM_MAX_WRP)
160 bp = tsk->thread.debug.hbp_watch[idx];
167 static int ptrace_hbp_set_event(unsigned int note_type,
168 struct task_struct *tsk,
170 struct perf_event *bp)
175 case NT_ARM_HW_BREAK:
176 if (idx < ARM_MAX_BRP) {
177 tsk->thread.debug.hbp_break[idx] = bp;
181 case NT_ARM_HW_WATCH:
182 if (idx < ARM_MAX_WRP) {
183 tsk->thread.debug.hbp_watch[idx] = bp;
192 static struct perf_event *ptrace_hbp_create(unsigned int note_type,
193 struct task_struct *tsk,
196 struct perf_event *bp;
197 struct perf_event_attr attr;
201 case NT_ARM_HW_BREAK:
202 type = HW_BREAKPOINT_X;
204 case NT_ARM_HW_WATCH:
205 type = HW_BREAKPOINT_RW;
208 return ERR_PTR(-EINVAL);
211 ptrace_breakpoint_init(&attr);
214 * Initialise fields to sane defaults
215 * (i.e. values that will pass validation).
218 attr.bp_len = HW_BREAKPOINT_LEN_4;
222 bp = register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, tsk);
226 err = ptrace_hbp_set_event(note_type, tsk, idx, bp);
233 static int ptrace_hbp_fill_attr_ctrl(unsigned int note_type,
234 struct arch_hw_breakpoint_ctrl ctrl,
235 struct perf_event_attr *attr)
237 int err, len, type, disabled = !ctrl.enabled;
241 type = HW_BREAKPOINT_EMPTY;
243 err = arch_bp_generic_fields(ctrl, &len, &type);
248 case NT_ARM_HW_BREAK:
249 if ((type & HW_BREAKPOINT_X) != type)
252 case NT_ARM_HW_WATCH:
253 if ((type & HW_BREAKPOINT_RW) != type)
262 attr->bp_type = type;
263 attr->disabled = disabled;
268 static int ptrace_hbp_get_resource_info(unsigned int note_type, u32 *info)
274 case NT_ARM_HW_BREAK:
275 num = hw_breakpoint_slots(TYPE_INST);
277 case NT_ARM_HW_WATCH:
278 num = hw_breakpoint_slots(TYPE_DATA);
284 reg |= debug_monitors_arch();
292 static int ptrace_hbp_get_ctrl(unsigned int note_type,
293 struct task_struct *tsk,
297 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
302 *ctrl = bp ? encode_ctrl_reg(counter_arch_bp(bp)->ctrl) : 0;
306 static int ptrace_hbp_get_addr(unsigned int note_type,
307 struct task_struct *tsk,
311 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
316 *addr = bp ? bp->attr.bp_addr : 0;
320 static struct perf_event *ptrace_hbp_get_initialised_bp(unsigned int note_type,
321 struct task_struct *tsk,
324 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
327 bp = ptrace_hbp_create(note_type, tsk, idx);
332 static int ptrace_hbp_set_ctrl(unsigned int note_type,
333 struct task_struct *tsk,
338 struct perf_event *bp;
339 struct perf_event_attr attr;
340 struct arch_hw_breakpoint_ctrl ctrl;
342 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
349 decode_ctrl_reg(uctrl, &ctrl);
350 err = ptrace_hbp_fill_attr_ctrl(note_type, ctrl, &attr);
354 return modify_user_hw_breakpoint(bp, &attr);
357 static int ptrace_hbp_set_addr(unsigned int note_type,
358 struct task_struct *tsk,
363 struct perf_event *bp;
364 struct perf_event_attr attr;
366 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
374 err = modify_user_hw_breakpoint(bp, &attr);
378 #define PTRACE_HBP_ADDR_SZ sizeof(u64)
379 #define PTRACE_HBP_CTRL_SZ sizeof(u32)
380 #define PTRACE_HBP_PAD_SZ sizeof(u32)
382 static int hw_break_get(struct task_struct *target,
383 const struct user_regset *regset,
384 unsigned int pos, unsigned int count,
385 void *kbuf, void __user *ubuf)
387 unsigned int note_type = regset->core_note_type;
388 int ret, idx = 0, offset, limit;
393 ret = ptrace_hbp_get_resource_info(note_type, &info);
397 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0,
403 offset = offsetof(struct user_hwdebug_state, pad);
404 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, offset,
405 offset + PTRACE_HBP_PAD_SZ);
409 /* (address, ctrl) registers */
410 offset = offsetof(struct user_hwdebug_state, dbg_regs);
411 limit = regset->n * regset->size;
412 while (count && offset < limit) {
413 ret = ptrace_hbp_get_addr(note_type, target, idx, &addr);
416 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &addr,
417 offset, offset + PTRACE_HBP_ADDR_SZ);
420 offset += PTRACE_HBP_ADDR_SZ;
422 ret = ptrace_hbp_get_ctrl(note_type, target, idx, &ctrl);
425 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &ctrl,
426 offset, offset + PTRACE_HBP_CTRL_SZ);
429 offset += PTRACE_HBP_CTRL_SZ;
431 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
433 offset + PTRACE_HBP_PAD_SZ);
436 offset += PTRACE_HBP_PAD_SZ;
443 static int hw_break_set(struct task_struct *target,
444 const struct user_regset *regset,
445 unsigned int pos, unsigned int count,
446 const void *kbuf, const void __user *ubuf)
448 unsigned int note_type = regset->core_note_type;
449 int ret, idx = 0, offset, limit;
453 /* Resource info and pad */
454 offset = offsetof(struct user_hwdebug_state, dbg_regs);
455 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
459 /* (address, ctrl) registers */
460 limit = regset->n * regset->size;
461 while (count && offset < limit) {
462 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
463 offset, offset + PTRACE_HBP_ADDR_SZ);
466 ret = ptrace_hbp_set_addr(note_type, target, idx, addr);
469 offset += PTRACE_HBP_ADDR_SZ;
471 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
472 offset, offset + PTRACE_HBP_CTRL_SZ);
475 ret = ptrace_hbp_set_ctrl(note_type, target, idx, ctrl);
478 offset += PTRACE_HBP_CTRL_SZ;
480 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
482 offset + PTRACE_HBP_PAD_SZ);
485 offset += PTRACE_HBP_PAD_SZ;
491 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
493 static int gpr_get(struct task_struct *target,
494 const struct user_regset *regset,
495 unsigned int pos, unsigned int count,
496 void *kbuf, void __user *ubuf)
498 struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
499 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
502 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
503 unsigned int pos, unsigned int count,
504 const void *kbuf, const void __user *ubuf)
507 struct user_pt_regs newregs;
509 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
513 if (!valid_user_regs(&newregs))
516 task_pt_regs(target)->user_regs = newregs;
521 * TODO: update fp accessors for lazy context switching (sync/flush hwstate)
523 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
524 unsigned int pos, unsigned int count,
525 void *kbuf, void __user *ubuf)
527 struct user_fpsimd_state *uregs;
528 uregs = &target->thread.fpsimd_state.user_fpsimd;
529 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
532 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
533 unsigned int pos, unsigned int count,
534 const void *kbuf, const void __user *ubuf)
537 struct user_fpsimd_state newstate;
539 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
543 target->thread.fpsimd_state.user_fpsimd = newstate;
547 static int tls_get(struct task_struct *target, const struct user_regset *regset,
548 unsigned int pos, unsigned int count,
549 void *kbuf, void __user *ubuf)
551 unsigned long *tls = &target->thread.tp_value;
552 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, tls, 0, -1);
555 static int tls_set(struct task_struct *target, const struct user_regset *regset,
556 unsigned int pos, unsigned int count,
557 const void *kbuf, const void __user *ubuf)
562 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
566 target->thread.tp_value = tls;
570 enum aarch64_regset {
574 #ifdef CONFIG_HAVE_HW_BREAKPOINT
580 static const struct user_regset aarch64_regsets[] = {
582 .core_note_type = NT_PRSTATUS,
583 .n = sizeof(struct user_pt_regs) / sizeof(u64),
585 .align = sizeof(u64),
590 .core_note_type = NT_PRFPREG,
591 .n = sizeof(struct user_fpsimd_state) / sizeof(u32),
593 * We pretend we have 32-bit registers because the fpsr and
594 * fpcr are 32-bits wide.
597 .align = sizeof(u32),
602 .core_note_type = NT_ARM_TLS,
604 .size = sizeof(void *),
605 .align = sizeof(void *),
609 #ifdef CONFIG_HAVE_HW_BREAKPOINT
610 [REGSET_HW_BREAK] = {
611 .core_note_type = NT_ARM_HW_BREAK,
612 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
614 .align = sizeof(u32),
618 [REGSET_HW_WATCH] = {
619 .core_note_type = NT_ARM_HW_WATCH,
620 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
622 .align = sizeof(u32),
629 static const struct user_regset_view user_aarch64_view = {
630 .name = "aarch64", .e_machine = EM_AARCH64,
631 .regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets)
635 #include <linux/compat.h>
642 static int compat_gpr_get(struct task_struct *target,
643 const struct user_regset *regset,
644 unsigned int pos, unsigned int count,
645 void *kbuf, void __user *ubuf)
648 unsigned int i, start, num_regs;
650 /* Calculate the number of AArch32 registers contained in count */
651 num_regs = count / regset->size;
653 /* Convert pos into an register number */
654 start = pos / regset->size;
656 if (start + num_regs > regset->n)
659 for (i = 0; i < num_regs; ++i) {
660 unsigned int idx = start + i;
665 reg = (void *)&task_pt_regs(target)->pc;
668 reg = (void *)&task_pt_regs(target)->pstate;
671 reg = (void *)&task_pt_regs(target)->orig_x0;
674 reg = (void *)&task_pt_regs(target)->regs[idx];
677 ret = copy_to_user(ubuf, reg, sizeof(compat_ulong_t));
682 ubuf += sizeof(compat_ulong_t);
688 static int compat_gpr_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)
693 struct pt_regs newregs;
695 unsigned int i, start, num_regs;
697 /* Calculate the number of AArch32 registers contained in count */
698 num_regs = count / regset->size;
700 /* Convert pos into an register number */
701 start = pos / regset->size;
703 if (start + num_regs > regset->n)
706 newregs = *task_pt_regs(target);
708 for (i = 0; i < num_regs; ++i) {
709 unsigned int idx = start + i;
714 reg = (void *)&newregs.pc;
717 reg = (void *)&newregs.pstate;
720 reg = (void *)&newregs.orig_x0;
723 reg = (void *)&newregs.regs[idx];
726 ret = copy_from_user(reg, ubuf, sizeof(compat_ulong_t));
731 ubuf += sizeof(compat_ulong_t);
734 if (valid_user_regs(&newregs.user_regs))
735 *task_pt_regs(target) = newregs;
743 static int compat_vfp_get(struct task_struct *target,
744 const struct user_regset *regset,
745 unsigned int pos, unsigned int count,
746 void *kbuf, void __user *ubuf)
748 struct user_fpsimd_state *uregs;
749 compat_ulong_t fpscr;
752 uregs = &target->thread.fpsimd_state.user_fpsimd;
755 * The VFP registers are packed into the fpsimd_state, so they all sit
756 * nicely together for us. We just need to create the fpscr separately.
758 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
759 VFP_STATE_SIZE - sizeof(compat_ulong_t));
762 fpscr = (uregs->fpsr & VFP_FPSCR_STAT_MASK) |
763 (uregs->fpcr & VFP_FPSCR_CTRL_MASK);
764 ret = put_user(fpscr, (compat_ulong_t *)ubuf);
770 static int compat_vfp_set(struct task_struct *target,
771 const struct user_regset *regset,
772 unsigned int pos, unsigned int count,
773 const void *kbuf, const void __user *ubuf)
775 struct user_fpsimd_state *uregs;
776 compat_ulong_t fpscr;
779 if (pos + count > VFP_STATE_SIZE)
782 uregs = &target->thread.fpsimd_state.user_fpsimd;
784 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
785 VFP_STATE_SIZE - sizeof(compat_ulong_t));
788 ret = get_user(fpscr, (compat_ulong_t *)ubuf);
789 uregs->fpsr = fpscr & VFP_FPSCR_STAT_MASK;
790 uregs->fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
796 static const struct user_regset aarch32_regsets[] = {
797 [REGSET_COMPAT_GPR] = {
798 .core_note_type = NT_PRSTATUS,
799 .n = COMPAT_ELF_NGREG,
800 .size = sizeof(compat_elf_greg_t),
801 .align = sizeof(compat_elf_greg_t),
802 .get = compat_gpr_get,
803 .set = compat_gpr_set
805 [REGSET_COMPAT_VFP] = {
806 .core_note_type = NT_ARM_VFP,
807 .n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
808 .size = sizeof(compat_ulong_t),
809 .align = sizeof(compat_ulong_t),
810 .get = compat_vfp_get,
811 .set = compat_vfp_set
815 static const struct user_regset_view user_aarch32_view = {
816 .name = "aarch32", .e_machine = EM_ARM,
817 .regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets)
820 int aarch32_break_trap(struct pt_regs *regs)
824 void __user *pc = (void __user *)instruction_pointer(regs);
826 if (compat_thumb_mode(regs)) {
827 /* get 16-bit Thumb instruction */
828 get_user(instr, (u16 __user *)pc);
829 if (instr == AARCH32_BREAK_THUMB2_LO) {
830 /* get second half of 32-bit Thumb-2 instruction */
831 get_user(instr, (u16 __user *)(pc + 2));
832 bp = instr == AARCH32_BREAK_THUMB2_HI;
834 bp = instr == AARCH32_BREAK_THUMB;
837 /* 32-bit ARM instruction */
838 get_user(instr, (u32 __user *)pc);
839 bp = (instr & ~0xf0000000) == AARCH32_BREAK_ARM;
843 return ptrace_break(regs);
847 static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
848 compat_ulong_t __user *ret)
855 if (off == COMPAT_PT_TEXT_ADDR)
856 tmp = tsk->mm->start_code;
857 else if (off == COMPAT_PT_DATA_ADDR)
858 tmp = tsk->mm->start_data;
859 else if (off == COMPAT_PT_TEXT_END_ADDR)
860 tmp = tsk->mm->end_code;
861 else if (off < sizeof(compat_elf_gregset_t))
862 return copy_regset_to_user(tsk, &user_aarch32_view,
863 REGSET_COMPAT_GPR, off,
864 sizeof(compat_ulong_t), ret);
865 else if (off >= COMPAT_USER_SZ)
870 return put_user(tmp, ret);
873 static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off,
878 if (off & 3 || off >= COMPAT_USER_SZ)
881 if (off >= sizeof(compat_elf_gregset_t))
884 ret = copy_regset_from_user(tsk, &user_aarch32_view,
885 REGSET_COMPAT_GPR, off,
886 sizeof(compat_ulong_t),
891 #ifdef CONFIG_HAVE_HW_BREAKPOINT
894 * Convert a virtual register number into an index for a thread_info
895 * breakpoint array. Breakpoints are identified using positive numbers
896 * whilst watchpoints are negative. The registers are laid out as pairs
897 * of (address, control), each pair mapping to a unique hw_breakpoint struct.
898 * Register 0 is reserved for describing resource information.
900 static int compat_ptrace_hbp_num_to_idx(compat_long_t num)
902 return (abs(num) - 1) >> 1;
905 static int compat_ptrace_hbp_get_resource_info(u32 *kdata)
907 u8 num_brps, num_wrps, debug_arch, wp_len;
910 num_brps = hw_breakpoint_slots(TYPE_INST);
911 num_wrps = hw_breakpoint_slots(TYPE_DATA);
913 debug_arch = debug_monitors_arch();
927 static int compat_ptrace_hbp_get(unsigned int note_type,
928 struct task_struct *tsk,
935 int err, idx = compat_ptrace_hbp_num_to_idx(num);;
938 err = ptrace_hbp_get_addr(note_type, tsk, idx, &addr);
941 err = ptrace_hbp_get_ctrl(note_type, tsk, idx, &ctrl);
948 static int compat_ptrace_hbp_set(unsigned int note_type,
949 struct task_struct *tsk,
956 int err, idx = compat_ptrace_hbp_num_to_idx(num);
960 err = ptrace_hbp_set_addr(note_type, tsk, idx, addr);
963 err = ptrace_hbp_set_ctrl(note_type, tsk, idx, ctrl);
969 static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
970 compat_ulong_t __user *data)
974 mm_segment_t old_fs = get_fs();
979 ret = compat_ptrace_hbp_get(NT_ARM_HW_WATCH, tsk, num, &kdata);
981 } else if (num == 0) {
982 ret = compat_ptrace_hbp_get_resource_info(&kdata);
985 ret = compat_ptrace_hbp_get(NT_ARM_HW_BREAK, tsk, num, &kdata);
990 ret = put_user(kdata, data);
995 static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
996 compat_ulong_t __user *data)
1000 mm_segment_t old_fs = get_fs();
1005 ret = get_user(kdata, data);
1011 ret = compat_ptrace_hbp_set(NT_ARM_HW_WATCH, tsk, num, &kdata);
1013 ret = compat_ptrace_hbp_set(NT_ARM_HW_BREAK, tsk, num, &kdata);
1018 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
1020 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1021 compat_ulong_t caddr, compat_ulong_t cdata)
1023 unsigned long addr = caddr;
1024 unsigned long data = cdata;
1025 void __user *datap = compat_ptr(data);
1029 case PTRACE_PEEKUSR:
1030 ret = compat_ptrace_read_user(child, addr, datap);
1033 case PTRACE_POKEUSR:
1034 ret = compat_ptrace_write_user(child, addr, data);
1037 case COMPAT_PTRACE_GETREGS:
1038 ret = copy_regset_to_user(child,
1041 0, sizeof(compat_elf_gregset_t),
1045 case COMPAT_PTRACE_SETREGS:
1046 ret = copy_regset_from_user(child,
1049 0, sizeof(compat_elf_gregset_t),
1053 case COMPAT_PTRACE_GET_THREAD_AREA:
1054 ret = put_user((compat_ulong_t)child->thread.tp_value,
1055 (compat_ulong_t __user *)datap);
1058 case COMPAT_PTRACE_SET_SYSCALL:
1059 task_pt_regs(child)->syscallno = data;
1063 case COMPAT_PTRACE_GETVFPREGS:
1064 ret = copy_regset_to_user(child,
1071 case COMPAT_PTRACE_SETVFPREGS:
1072 ret = copy_regset_from_user(child,
1079 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1080 case COMPAT_PTRACE_GETHBPREGS:
1081 ret = compat_ptrace_gethbpregs(child, addr, datap);
1084 case COMPAT_PTRACE_SETHBPREGS:
1085 ret = compat_ptrace_sethbpregs(child, addr, datap);
1090 ret = compat_ptrace_request(child, request, addr,
1097 #endif /* CONFIG_COMPAT */
1099 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1101 #ifdef CONFIG_COMPAT
1102 if (is_compat_thread(task_thread_info(task)))
1103 return &user_aarch32_view;
1105 return &user_aarch64_view;
1108 long arch_ptrace(struct task_struct *child, long request,
1109 unsigned long addr, unsigned long data)
1111 return ptrace_request(child, request, addr, data);
1115 static int __init ptrace_break_init(void)
1117 hook_debug_fault_code(DBG_ESR_EVT_BRK, arm64_break_trap, SIGTRAP,
1118 TRAP_BRKPT, "ptrace BRK handler");
1121 core_initcall(ptrace_break_init);
1124 asmlinkage int syscall_trace(int dir, struct pt_regs *regs)
1126 unsigned long saved_reg;
1128 if (!test_thread_flag(TIF_SYSCALL_TRACE))
1129 return regs->syscallno;
1131 if (is_compat_task()) {
1132 /* AArch32 uses ip (r12) for scratch */
1133 saved_reg = regs->regs[12];
1134 regs->regs[12] = dir;
1137 * Save X7. X7 is used to denote syscall entry/exit:
1138 * X7 = 0 -> entry, = 1 -> exit
1140 saved_reg = regs->regs[7];
1141 regs->regs[7] = dir;
1145 tracehook_report_syscall_exit(regs, 0);
1146 else if (tracehook_report_syscall_entry(regs))
1147 regs->syscallno = ~0UL;
1149 if (is_compat_task())
1150 regs->regs[12] = saved_reg;
1152 regs->regs[7] = saved_reg;
1154 return regs->syscallno;