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/audit.h>
23 #include <linux/compat.h>
24 #include <linux/kernel.h>
25 #include <linux/sched.h>
27 #include <linux/smp.h>
28 #include <linux/ptrace.h>
29 #include <linux/user.h>
30 #include <linux/security.h>
31 #include <linux/init.h>
32 #include <linux/signal.h>
33 #include <linux/uaccess.h>
34 #include <linux/perf_event.h>
35 #include <linux/hw_breakpoint.h>
36 #include <linux/regset.h>
37 #include <linux/tracehook.h>
38 #include <linux/elf.h>
40 #include <asm/compat.h>
41 #include <asm/debug-monitors.h>
42 #include <asm/pgtable.h>
43 #include <asm/syscall.h>
44 #include <asm/traps.h>
45 #include <asm/system_misc.h>
47 #define CREATE_TRACE_POINTS
48 #include <trace/events/syscalls.h>
51 * TODO: does not yet catch signals sent when the child dies.
52 * in exit.c or in signal.c.
56 * Called by kernel/ptrace.c when detaching..
58 void ptrace_disable(struct task_struct *child)
62 #ifdef CONFIG_HAVE_HW_BREAKPOINT
64 * Handle hitting a HW-breakpoint.
66 static void ptrace_hbptriggered(struct perf_event *bp,
67 struct perf_sample_data *data,
70 struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
74 .si_code = TRAP_HWBKPT,
75 .si_addr = (void __user *)(bkpt->trigger),
81 if (!is_compat_task())
84 for (i = 0; i < ARM_MAX_BRP; ++i) {
85 if (current->thread.debug.hbp_break[i] == bp) {
86 info.si_errno = (i << 1) + 1;
91 for (i = 0; i < ARM_MAX_WRP; ++i) {
92 if (current->thread.debug.hbp_watch[i] == bp) {
93 info.si_errno = -((i << 1) + 1);
100 force_sig_info(SIGTRAP, &info, current);
104 * Unregister breakpoints from this task and reset the pointers in
107 void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
110 struct thread_struct *t = &tsk->thread;
112 for (i = 0; i < ARM_MAX_BRP; i++) {
113 if (t->debug.hbp_break[i]) {
114 unregister_hw_breakpoint(t->debug.hbp_break[i]);
115 t->debug.hbp_break[i] = NULL;
119 for (i = 0; i < ARM_MAX_WRP; i++) {
120 if (t->debug.hbp_watch[i]) {
121 unregister_hw_breakpoint(t->debug.hbp_watch[i]);
122 t->debug.hbp_watch[i] = NULL;
127 void ptrace_hw_copy_thread(struct task_struct *tsk)
129 memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
132 static struct perf_event *ptrace_hbp_get_event(unsigned int note_type,
133 struct task_struct *tsk,
136 struct perf_event *bp = ERR_PTR(-EINVAL);
139 case NT_ARM_HW_BREAK:
140 if (idx < ARM_MAX_BRP)
141 bp = tsk->thread.debug.hbp_break[idx];
143 case NT_ARM_HW_WATCH:
144 if (idx < ARM_MAX_WRP)
145 bp = tsk->thread.debug.hbp_watch[idx];
152 static int ptrace_hbp_set_event(unsigned int note_type,
153 struct task_struct *tsk,
155 struct perf_event *bp)
160 case NT_ARM_HW_BREAK:
161 if (idx < ARM_MAX_BRP) {
162 tsk->thread.debug.hbp_break[idx] = bp;
166 case NT_ARM_HW_WATCH:
167 if (idx < ARM_MAX_WRP) {
168 tsk->thread.debug.hbp_watch[idx] = bp;
177 static struct perf_event *ptrace_hbp_create(unsigned int note_type,
178 struct task_struct *tsk,
181 struct perf_event *bp;
182 struct perf_event_attr attr;
186 case NT_ARM_HW_BREAK:
187 type = HW_BREAKPOINT_X;
189 case NT_ARM_HW_WATCH:
190 type = HW_BREAKPOINT_RW;
193 return ERR_PTR(-EINVAL);
196 ptrace_breakpoint_init(&attr);
199 * Initialise fields to sane defaults
200 * (i.e. values that will pass validation).
203 attr.bp_len = HW_BREAKPOINT_LEN_4;
207 bp = register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, tsk);
211 err = ptrace_hbp_set_event(note_type, tsk, idx, bp);
218 static int ptrace_hbp_fill_attr_ctrl(unsigned int note_type,
219 struct arch_hw_breakpoint_ctrl ctrl,
220 struct perf_event_attr *attr)
222 int err, len, type, disabled = !ctrl.enabled;
224 attr->disabled = disabled;
228 err = arch_bp_generic_fields(ctrl, &len, &type);
233 case NT_ARM_HW_BREAK:
234 if ((type & HW_BREAKPOINT_X) != type)
237 case NT_ARM_HW_WATCH:
238 if ((type & HW_BREAKPOINT_RW) != type)
246 attr->bp_type = type;
251 static int ptrace_hbp_get_resource_info(unsigned int note_type, u32 *info)
257 case NT_ARM_HW_BREAK:
258 num = hw_breakpoint_slots(TYPE_INST);
260 case NT_ARM_HW_WATCH:
261 num = hw_breakpoint_slots(TYPE_DATA);
267 reg |= debug_monitors_arch();
275 static int ptrace_hbp_get_ctrl(unsigned int note_type,
276 struct task_struct *tsk,
280 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
285 *ctrl = bp ? encode_ctrl_reg(counter_arch_bp(bp)->ctrl) : 0;
289 static int ptrace_hbp_get_addr(unsigned int note_type,
290 struct task_struct *tsk,
294 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
299 *addr = bp ? bp->attr.bp_addr : 0;
303 static struct perf_event *ptrace_hbp_get_initialised_bp(unsigned int note_type,
304 struct task_struct *tsk,
307 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
310 bp = ptrace_hbp_create(note_type, tsk, idx);
315 static int ptrace_hbp_set_ctrl(unsigned int note_type,
316 struct task_struct *tsk,
321 struct perf_event *bp;
322 struct perf_event_attr attr;
323 struct arch_hw_breakpoint_ctrl ctrl;
325 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
332 decode_ctrl_reg(uctrl, &ctrl);
333 err = ptrace_hbp_fill_attr_ctrl(note_type, ctrl, &attr);
337 return modify_user_hw_breakpoint(bp, &attr);
340 static int ptrace_hbp_set_addr(unsigned int note_type,
341 struct task_struct *tsk,
346 struct perf_event *bp;
347 struct perf_event_attr attr;
349 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
357 err = modify_user_hw_breakpoint(bp, &attr);
361 #define PTRACE_HBP_ADDR_SZ sizeof(u64)
362 #define PTRACE_HBP_CTRL_SZ sizeof(u32)
363 #define PTRACE_HBP_PAD_SZ sizeof(u32)
365 static int hw_break_get(struct task_struct *target,
366 const struct user_regset *regset,
367 unsigned int pos, unsigned int count,
368 void *kbuf, void __user *ubuf)
370 unsigned int note_type = regset->core_note_type;
371 int ret, idx = 0, offset, limit;
376 ret = ptrace_hbp_get_resource_info(note_type, &info);
380 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0,
386 offset = offsetof(struct user_hwdebug_state, pad);
387 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, offset,
388 offset + PTRACE_HBP_PAD_SZ);
392 /* (address, ctrl) registers */
393 offset = offsetof(struct user_hwdebug_state, dbg_regs);
394 limit = regset->n * regset->size;
395 while (count && offset < limit) {
396 ret = ptrace_hbp_get_addr(note_type, target, idx, &addr);
399 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &addr,
400 offset, offset + PTRACE_HBP_ADDR_SZ);
403 offset += PTRACE_HBP_ADDR_SZ;
405 ret = ptrace_hbp_get_ctrl(note_type, target, idx, &ctrl);
408 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &ctrl,
409 offset, offset + PTRACE_HBP_CTRL_SZ);
412 offset += PTRACE_HBP_CTRL_SZ;
414 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
416 offset + PTRACE_HBP_PAD_SZ);
419 offset += PTRACE_HBP_PAD_SZ;
426 static int hw_break_set(struct task_struct *target,
427 const struct user_regset *regset,
428 unsigned int pos, unsigned int count,
429 const void *kbuf, const void __user *ubuf)
431 unsigned int note_type = regset->core_note_type;
432 int ret, idx = 0, offset, limit;
436 /* Resource info and pad */
437 offset = offsetof(struct user_hwdebug_state, dbg_regs);
438 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
442 /* (address, ctrl) registers */
443 limit = regset->n * regset->size;
444 while (count && offset < limit) {
445 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
446 offset, offset + PTRACE_HBP_ADDR_SZ);
449 ret = ptrace_hbp_set_addr(note_type, target, idx, addr);
452 offset += PTRACE_HBP_ADDR_SZ;
454 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
455 offset, offset + PTRACE_HBP_CTRL_SZ);
458 ret = ptrace_hbp_set_ctrl(note_type, target, idx, ctrl);
461 offset += PTRACE_HBP_CTRL_SZ;
463 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
465 offset + PTRACE_HBP_PAD_SZ);
468 offset += PTRACE_HBP_PAD_SZ;
474 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
476 static int gpr_get(struct task_struct *target,
477 const struct user_regset *regset,
478 unsigned int pos, unsigned int count,
479 void *kbuf, void __user *ubuf)
481 struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
482 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
485 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
486 unsigned int pos, unsigned int count,
487 const void *kbuf, const void __user *ubuf)
490 struct user_pt_regs newregs;
492 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
496 if (!valid_user_regs(&newregs))
499 task_pt_regs(target)->user_regs = newregs;
504 * TODO: update fp accessors for lazy context switching (sync/flush hwstate)
506 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
507 unsigned int pos, unsigned int count,
508 void *kbuf, void __user *ubuf)
510 struct user_fpsimd_state *uregs;
511 uregs = &target->thread.fpsimd_state.user_fpsimd;
512 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
515 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
516 unsigned int pos, unsigned int count,
517 const void *kbuf, const void __user *ubuf)
520 struct user_fpsimd_state newstate;
522 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
526 target->thread.fpsimd_state.user_fpsimd = newstate;
527 fpsimd_flush_task_state(target);
531 static int tls_get(struct task_struct *target, const struct user_regset *regset,
532 unsigned int pos, unsigned int count,
533 void *kbuf, void __user *ubuf)
535 unsigned long *tls = &target->thread.tp_value;
536 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, tls, 0, -1);
539 static int tls_set(struct task_struct *target, const struct user_regset *regset,
540 unsigned int pos, unsigned int count,
541 const void *kbuf, const void __user *ubuf)
546 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
550 target->thread.tp_value = tls;
554 enum aarch64_regset {
558 #ifdef CONFIG_HAVE_HW_BREAKPOINT
564 static const struct user_regset aarch64_regsets[] = {
566 .core_note_type = NT_PRSTATUS,
567 .n = sizeof(struct user_pt_regs) / sizeof(u64),
569 .align = sizeof(u64),
574 .core_note_type = NT_PRFPREG,
575 .n = sizeof(struct user_fpsimd_state) / sizeof(u32),
577 * We pretend we have 32-bit registers because the fpsr and
578 * fpcr are 32-bits wide.
581 .align = sizeof(u32),
586 .core_note_type = NT_ARM_TLS,
588 .size = sizeof(void *),
589 .align = sizeof(void *),
593 #ifdef CONFIG_HAVE_HW_BREAKPOINT
594 [REGSET_HW_BREAK] = {
595 .core_note_type = NT_ARM_HW_BREAK,
596 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
598 .align = sizeof(u32),
602 [REGSET_HW_WATCH] = {
603 .core_note_type = NT_ARM_HW_WATCH,
604 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
606 .align = sizeof(u32),
613 static const struct user_regset_view user_aarch64_view = {
614 .name = "aarch64", .e_machine = EM_AARCH64,
615 .regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets)
619 #include <linux/compat.h>
626 static int compat_gpr_get(struct task_struct *target,
627 const struct user_regset *regset,
628 unsigned int pos, unsigned int count,
629 void *kbuf, void __user *ubuf)
632 unsigned int i, start, num_regs;
634 /* Calculate the number of AArch32 registers contained in count */
635 num_regs = count / regset->size;
637 /* Convert pos into an register number */
638 start = pos / regset->size;
640 if (start + num_regs > regset->n)
643 for (i = 0; i < num_regs; ++i) {
644 unsigned int idx = start + i;
649 reg = task_pt_regs(target)->pc;
652 reg = task_pt_regs(target)->pstate;
655 reg = task_pt_regs(target)->orig_x0;
658 reg = task_pt_regs(target)->regs[idx];
662 memcpy(kbuf, ®, sizeof(reg));
665 ret = copy_to_user(ubuf, ®, sizeof(reg));
678 static int compat_gpr_set(struct task_struct *target,
679 const struct user_regset *regset,
680 unsigned int pos, unsigned int count,
681 const void *kbuf, const void __user *ubuf)
683 struct pt_regs newregs;
685 unsigned int i, start, num_regs;
687 /* Calculate the number of AArch32 registers contained in count */
688 num_regs = count / regset->size;
690 /* Convert pos into an register number */
691 start = pos / regset->size;
693 if (start + num_regs > regset->n)
696 newregs = *task_pt_regs(target);
698 for (i = 0; i < num_regs; ++i) {
699 unsigned int idx = start + i;
703 memcpy(®, kbuf, sizeof(reg));
706 ret = copy_from_user(®, ubuf, sizeof(reg));
720 newregs.pstate = reg;
723 newregs.orig_x0 = reg;
726 newregs.regs[idx] = reg;
731 if (valid_user_regs(&newregs.user_regs))
732 *task_pt_regs(target) = newregs;
739 static int compat_vfp_get(struct task_struct *target,
740 const struct user_regset *regset,
741 unsigned int pos, unsigned int count,
742 void *kbuf, void __user *ubuf)
744 struct user_fpsimd_state *uregs;
745 compat_ulong_t fpscr;
748 uregs = &target->thread.fpsimd_state.user_fpsimd;
751 * The VFP registers are packed into the fpsimd_state, so they all sit
752 * nicely together for us. We just need to create the fpscr separately.
754 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
755 VFP_STATE_SIZE - sizeof(compat_ulong_t));
758 fpscr = (uregs->fpsr & VFP_FPSCR_STAT_MASK) |
759 (uregs->fpcr & VFP_FPSCR_CTRL_MASK);
760 ret = put_user(fpscr, (compat_ulong_t *)ubuf);
766 static int compat_vfp_set(struct task_struct *target,
767 const struct user_regset *regset,
768 unsigned int pos, unsigned int count,
769 const void *kbuf, const void __user *ubuf)
771 struct user_fpsimd_state *uregs;
772 compat_ulong_t fpscr;
775 if (pos + count > VFP_STATE_SIZE)
778 uregs = &target->thread.fpsimd_state.user_fpsimd;
780 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
781 VFP_STATE_SIZE - sizeof(compat_ulong_t));
784 ret = get_user(fpscr, (compat_ulong_t *)ubuf);
785 uregs->fpsr = fpscr & VFP_FPSCR_STAT_MASK;
786 uregs->fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
789 fpsimd_flush_task_state(target);
793 static const struct user_regset aarch32_regsets[] = {
794 [REGSET_COMPAT_GPR] = {
795 .core_note_type = NT_PRSTATUS,
796 .n = COMPAT_ELF_NGREG,
797 .size = sizeof(compat_elf_greg_t),
798 .align = sizeof(compat_elf_greg_t),
799 .get = compat_gpr_get,
800 .set = compat_gpr_set
802 [REGSET_COMPAT_VFP] = {
803 .core_note_type = NT_ARM_VFP,
804 .n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
805 .size = sizeof(compat_ulong_t),
806 .align = sizeof(compat_ulong_t),
807 .get = compat_vfp_get,
808 .set = compat_vfp_set
812 static const struct user_regset_view user_aarch32_view = {
813 .name = "aarch32", .e_machine = EM_ARM,
814 .regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets)
817 static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
818 compat_ulong_t __user *ret)
825 if (off == COMPAT_PT_TEXT_ADDR)
826 tmp = tsk->mm->start_code;
827 else if (off == COMPAT_PT_DATA_ADDR)
828 tmp = tsk->mm->start_data;
829 else if (off == COMPAT_PT_TEXT_END_ADDR)
830 tmp = tsk->mm->end_code;
831 else if (off < sizeof(compat_elf_gregset_t))
832 return copy_regset_to_user(tsk, &user_aarch32_view,
833 REGSET_COMPAT_GPR, off,
834 sizeof(compat_ulong_t), ret);
835 else if (off >= COMPAT_USER_SZ)
840 return put_user(tmp, ret);
843 static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off,
847 mm_segment_t old_fs = get_fs();
849 if (off & 3 || off >= COMPAT_USER_SZ)
852 if (off >= sizeof(compat_elf_gregset_t))
856 ret = copy_regset_from_user(tsk, &user_aarch32_view,
857 REGSET_COMPAT_GPR, off,
858 sizeof(compat_ulong_t),
865 #ifdef CONFIG_HAVE_HW_BREAKPOINT
868 * Convert a virtual register number into an index for a thread_info
869 * breakpoint array. Breakpoints are identified using positive numbers
870 * whilst watchpoints are negative. The registers are laid out as pairs
871 * of (address, control), each pair mapping to a unique hw_breakpoint struct.
872 * Register 0 is reserved for describing resource information.
874 static int compat_ptrace_hbp_num_to_idx(compat_long_t num)
876 return (abs(num) - 1) >> 1;
879 static int compat_ptrace_hbp_get_resource_info(u32 *kdata)
881 u8 num_brps, num_wrps, debug_arch, wp_len;
884 num_brps = hw_breakpoint_slots(TYPE_INST);
885 num_wrps = hw_breakpoint_slots(TYPE_DATA);
887 debug_arch = debug_monitors_arch();
901 static int compat_ptrace_hbp_get(unsigned int note_type,
902 struct task_struct *tsk,
909 int err, idx = compat_ptrace_hbp_num_to_idx(num);;
912 err = ptrace_hbp_get_addr(note_type, tsk, idx, &addr);
915 err = ptrace_hbp_get_ctrl(note_type, tsk, idx, &ctrl);
922 static int compat_ptrace_hbp_set(unsigned int note_type,
923 struct task_struct *tsk,
930 int err, idx = compat_ptrace_hbp_num_to_idx(num);
934 err = ptrace_hbp_set_addr(note_type, tsk, idx, addr);
937 err = ptrace_hbp_set_ctrl(note_type, tsk, idx, ctrl);
943 static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
944 compat_ulong_t __user *data)
948 mm_segment_t old_fs = get_fs();
953 ret = compat_ptrace_hbp_get(NT_ARM_HW_WATCH, tsk, num, &kdata);
955 } else if (num == 0) {
956 ret = compat_ptrace_hbp_get_resource_info(&kdata);
959 ret = compat_ptrace_hbp_get(NT_ARM_HW_BREAK, tsk, num, &kdata);
964 ret = put_user(kdata, data);
969 static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
970 compat_ulong_t __user *data)
974 mm_segment_t old_fs = get_fs();
979 ret = get_user(kdata, data);
985 ret = compat_ptrace_hbp_set(NT_ARM_HW_WATCH, tsk, num, &kdata);
987 ret = compat_ptrace_hbp_set(NT_ARM_HW_BREAK, tsk, num, &kdata);
992 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
994 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
995 compat_ulong_t caddr, compat_ulong_t cdata)
997 unsigned long addr = caddr;
998 unsigned long data = cdata;
999 void __user *datap = compat_ptr(data);
1003 case PTRACE_PEEKUSR:
1004 ret = compat_ptrace_read_user(child, addr, datap);
1007 case PTRACE_POKEUSR:
1008 ret = compat_ptrace_write_user(child, addr, data);
1011 case COMPAT_PTRACE_GETREGS:
1012 ret = copy_regset_to_user(child,
1015 0, sizeof(compat_elf_gregset_t),
1019 case COMPAT_PTRACE_SETREGS:
1020 ret = copy_regset_from_user(child,
1023 0, sizeof(compat_elf_gregset_t),
1027 case COMPAT_PTRACE_GET_THREAD_AREA:
1028 ret = put_user((compat_ulong_t)child->thread.tp_value,
1029 (compat_ulong_t __user *)datap);
1032 case COMPAT_PTRACE_SET_SYSCALL:
1033 task_pt_regs(child)->syscallno = data;
1037 case COMPAT_PTRACE_GETVFPREGS:
1038 ret = copy_regset_to_user(child,
1045 case COMPAT_PTRACE_SETVFPREGS:
1046 ret = copy_regset_from_user(child,
1053 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1054 case COMPAT_PTRACE_GETHBPREGS:
1055 ret = compat_ptrace_gethbpregs(child, addr, datap);
1058 case COMPAT_PTRACE_SETHBPREGS:
1059 ret = compat_ptrace_sethbpregs(child, addr, datap);
1064 ret = compat_ptrace_request(child, request, addr,
1071 #endif /* CONFIG_COMPAT */
1073 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1075 #ifdef CONFIG_COMPAT
1076 if (is_compat_thread(task_thread_info(task)))
1077 return &user_aarch32_view;
1079 return &user_aarch64_view;
1082 long arch_ptrace(struct task_struct *child, long request,
1083 unsigned long addr, unsigned long data)
1085 return ptrace_request(child, request, addr, data);
1088 enum ptrace_syscall_dir {
1089 PTRACE_SYSCALL_ENTER = 0,
1090 PTRACE_SYSCALL_EXIT,
1093 static void tracehook_report_syscall(struct pt_regs *regs,
1094 enum ptrace_syscall_dir dir)
1097 unsigned long saved_reg;
1100 * A scratch register (ip(r12) on AArch32, x7 on AArch64) is
1101 * used to denote syscall entry/exit:
1103 regno = (is_compat_task() ? 12 : 7);
1104 saved_reg = regs->regs[regno];
1105 regs->regs[regno] = dir;
1107 if (dir == PTRACE_SYSCALL_EXIT)
1108 tracehook_report_syscall_exit(regs, 0);
1109 else if (tracehook_report_syscall_entry(regs))
1110 regs->syscallno = ~0UL;
1112 regs->regs[regno] = saved_reg;
1115 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1117 if (test_thread_flag(TIF_SYSCALL_TRACE))
1118 tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
1120 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
1121 trace_sys_enter(regs, regs->syscallno);
1123 audit_syscall_entry(syscall_get_arch(), regs->syscallno,
1124 regs->orig_x0, regs->regs[1], regs->regs[2], regs->regs[3]);
1126 return regs->syscallno;
1129 asmlinkage void syscall_trace_exit(struct pt_regs *regs)
1131 audit_syscall_exit(regs);
1133 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
1134 trace_sys_exit(regs, regs_return_value(regs));
1136 if (test_thread_flag(TIF_SYSCALL_TRACE))
1137 tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);