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)
56 #ifdef CONFIG_HAVE_HW_BREAKPOINT
58 * Handle hitting a HW-breakpoint.
60 static void ptrace_hbptriggered(struct perf_event *bp,
61 struct perf_sample_data *data,
64 struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
68 .si_code = TRAP_HWBKPT,
69 .si_addr = (void __user *)(bkpt->trigger),
75 if (!is_compat_task())
78 for (i = 0; i < ARM_MAX_BRP; ++i) {
79 if (current->thread.debug.hbp_break[i] == bp) {
80 info.si_errno = (i << 1) + 1;
84 for (i = ARM_MAX_BRP; i < ARM_MAX_HBP_SLOTS && !bp; ++i) {
85 if (current->thread.debug.hbp_watch[i] == bp) {
86 info.si_errno = -((i << 1) + 1);
93 force_sig_info(SIGTRAP, &info, current);
97 * Unregister breakpoints from this task and reset the pointers in
100 void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
103 struct thread_struct *t = &tsk->thread;
105 for (i = 0; i < ARM_MAX_BRP; i++) {
106 if (t->debug.hbp_break[i]) {
107 unregister_hw_breakpoint(t->debug.hbp_break[i]);
108 t->debug.hbp_break[i] = NULL;
112 for (i = 0; i < ARM_MAX_WRP; i++) {
113 if (t->debug.hbp_watch[i]) {
114 unregister_hw_breakpoint(t->debug.hbp_watch[i]);
115 t->debug.hbp_watch[i] = NULL;
120 void ptrace_hw_copy_thread(struct task_struct *tsk)
122 memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
125 static struct perf_event *ptrace_hbp_get_event(unsigned int note_type,
126 struct task_struct *tsk,
129 struct perf_event *bp = ERR_PTR(-EINVAL);
132 case NT_ARM_HW_BREAK:
133 if (idx < ARM_MAX_BRP)
134 bp = tsk->thread.debug.hbp_break[idx];
136 case NT_ARM_HW_WATCH:
137 if (idx < ARM_MAX_WRP)
138 bp = tsk->thread.debug.hbp_watch[idx];
145 static int ptrace_hbp_set_event(unsigned int note_type,
146 struct task_struct *tsk,
148 struct perf_event *bp)
153 case NT_ARM_HW_BREAK:
154 if (idx < ARM_MAX_BRP) {
155 tsk->thread.debug.hbp_break[idx] = bp;
159 case NT_ARM_HW_WATCH:
160 if (idx < ARM_MAX_WRP) {
161 tsk->thread.debug.hbp_watch[idx] = bp;
170 static struct perf_event *ptrace_hbp_create(unsigned int note_type,
171 struct task_struct *tsk,
174 struct perf_event *bp;
175 struct perf_event_attr attr;
179 case NT_ARM_HW_BREAK:
180 type = HW_BREAKPOINT_X;
182 case NT_ARM_HW_WATCH:
183 type = HW_BREAKPOINT_RW;
186 return ERR_PTR(-EINVAL);
189 ptrace_breakpoint_init(&attr);
192 * Initialise fields to sane defaults
193 * (i.e. values that will pass validation).
196 attr.bp_len = HW_BREAKPOINT_LEN_4;
200 bp = register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, tsk);
204 err = ptrace_hbp_set_event(note_type, tsk, idx, bp);
211 static int ptrace_hbp_fill_attr_ctrl(unsigned int note_type,
212 struct arch_hw_breakpoint_ctrl ctrl,
213 struct perf_event_attr *attr)
215 int err, len, type, disabled = !ctrl.enabled;
217 attr->disabled = disabled;
221 err = arch_bp_generic_fields(ctrl, &len, &type);
226 case NT_ARM_HW_BREAK:
227 if ((type & HW_BREAKPOINT_X) != type)
230 case NT_ARM_HW_WATCH:
231 if ((type & HW_BREAKPOINT_RW) != type)
239 attr->bp_type = type;
244 static int ptrace_hbp_get_resource_info(unsigned int note_type, u32 *info)
250 case NT_ARM_HW_BREAK:
251 num = hw_breakpoint_slots(TYPE_INST);
253 case NT_ARM_HW_WATCH:
254 num = hw_breakpoint_slots(TYPE_DATA);
260 reg |= debug_monitors_arch();
268 static int ptrace_hbp_get_ctrl(unsigned int note_type,
269 struct task_struct *tsk,
273 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
278 *ctrl = bp ? encode_ctrl_reg(counter_arch_bp(bp)->ctrl) : 0;
282 static int ptrace_hbp_get_addr(unsigned int note_type,
283 struct task_struct *tsk,
287 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
292 *addr = bp ? bp->attr.bp_addr : 0;
296 static struct perf_event *ptrace_hbp_get_initialised_bp(unsigned int note_type,
297 struct task_struct *tsk,
300 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
303 bp = ptrace_hbp_create(note_type, tsk, idx);
308 static int ptrace_hbp_set_ctrl(unsigned int note_type,
309 struct task_struct *tsk,
314 struct perf_event *bp;
315 struct perf_event_attr attr;
316 struct arch_hw_breakpoint_ctrl ctrl;
318 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
325 decode_ctrl_reg(uctrl, &ctrl);
326 err = ptrace_hbp_fill_attr_ctrl(note_type, ctrl, &attr);
330 return modify_user_hw_breakpoint(bp, &attr);
333 static int ptrace_hbp_set_addr(unsigned int note_type,
334 struct task_struct *tsk,
339 struct perf_event *bp;
340 struct perf_event_attr attr;
342 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
350 err = modify_user_hw_breakpoint(bp, &attr);
354 #define PTRACE_HBP_ADDR_SZ sizeof(u64)
355 #define PTRACE_HBP_CTRL_SZ sizeof(u32)
356 #define PTRACE_HBP_PAD_SZ sizeof(u32)
358 static int hw_break_get(struct task_struct *target,
359 const struct user_regset *regset,
360 unsigned int pos, unsigned int count,
361 void *kbuf, void __user *ubuf)
363 unsigned int note_type = regset->core_note_type;
364 int ret, idx = 0, offset, limit;
369 ret = ptrace_hbp_get_resource_info(note_type, &info);
373 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0,
379 offset = offsetof(struct user_hwdebug_state, pad);
380 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, offset,
381 offset + PTRACE_HBP_PAD_SZ);
385 /* (address, ctrl) registers */
386 offset = offsetof(struct user_hwdebug_state, dbg_regs);
387 limit = regset->n * regset->size;
388 while (count && offset < limit) {
389 ret = ptrace_hbp_get_addr(note_type, target, idx, &addr);
392 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &addr,
393 offset, offset + PTRACE_HBP_ADDR_SZ);
396 offset += PTRACE_HBP_ADDR_SZ;
398 ret = ptrace_hbp_get_ctrl(note_type, target, idx, &ctrl);
401 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &ctrl,
402 offset, offset + PTRACE_HBP_CTRL_SZ);
405 offset += PTRACE_HBP_CTRL_SZ;
407 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
409 offset + PTRACE_HBP_PAD_SZ);
412 offset += PTRACE_HBP_PAD_SZ;
419 static int hw_break_set(struct task_struct *target,
420 const struct user_regset *regset,
421 unsigned int pos, unsigned int count,
422 const void *kbuf, const void __user *ubuf)
424 unsigned int note_type = regset->core_note_type;
425 int ret, idx = 0, offset, limit;
429 /* Resource info and pad */
430 offset = offsetof(struct user_hwdebug_state, dbg_regs);
431 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
435 /* (address, ctrl) registers */
436 limit = regset->n * regset->size;
437 while (count && offset < limit) {
438 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
439 offset, offset + PTRACE_HBP_ADDR_SZ);
442 ret = ptrace_hbp_set_addr(note_type, target, idx, addr);
445 offset += PTRACE_HBP_ADDR_SZ;
447 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
448 offset, offset + PTRACE_HBP_CTRL_SZ);
451 ret = ptrace_hbp_set_ctrl(note_type, target, idx, ctrl);
454 offset += PTRACE_HBP_CTRL_SZ;
456 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
458 offset + PTRACE_HBP_PAD_SZ);
461 offset += PTRACE_HBP_PAD_SZ;
467 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
469 static int gpr_get(struct task_struct *target,
470 const struct user_regset *regset,
471 unsigned int pos, unsigned int count,
472 void *kbuf, void __user *ubuf)
474 struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
475 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
478 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
479 unsigned int pos, unsigned int count,
480 const void *kbuf, const void __user *ubuf)
483 struct user_pt_regs newregs;
485 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
489 if (!valid_user_regs(&newregs))
492 task_pt_regs(target)->user_regs = newregs;
497 * TODO: update fp accessors for lazy context switching (sync/flush hwstate)
499 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
500 unsigned int pos, unsigned int count,
501 void *kbuf, void __user *ubuf)
503 struct user_fpsimd_state *uregs;
504 uregs = &target->thread.fpsimd_state.user_fpsimd;
505 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
508 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
509 unsigned int pos, unsigned int count,
510 const void *kbuf, const void __user *ubuf)
513 struct user_fpsimd_state newstate;
515 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
519 target->thread.fpsimd_state.user_fpsimd = newstate;
523 static int tls_get(struct task_struct *target, const struct user_regset *regset,
524 unsigned int pos, unsigned int count,
525 void *kbuf, void __user *ubuf)
527 unsigned long *tls = &target->thread.tp_value;
528 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, tls, 0, -1);
531 static int tls_set(struct task_struct *target, const struct user_regset *regset,
532 unsigned int pos, unsigned int count,
533 const void *kbuf, const void __user *ubuf)
538 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
542 target->thread.tp_value = tls;
546 enum aarch64_regset {
550 #ifdef CONFIG_HAVE_HW_BREAKPOINT
556 static const struct user_regset aarch64_regsets[] = {
558 .core_note_type = NT_PRSTATUS,
559 .n = sizeof(struct user_pt_regs) / sizeof(u64),
561 .align = sizeof(u64),
566 .core_note_type = NT_PRFPREG,
567 .n = sizeof(struct user_fpsimd_state) / sizeof(u32),
569 * We pretend we have 32-bit registers because the fpsr and
570 * fpcr are 32-bits wide.
573 .align = sizeof(u32),
578 .core_note_type = NT_ARM_TLS,
580 .size = sizeof(void *),
581 .align = sizeof(void *),
585 #ifdef CONFIG_HAVE_HW_BREAKPOINT
586 [REGSET_HW_BREAK] = {
587 .core_note_type = NT_ARM_HW_BREAK,
588 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
590 .align = sizeof(u32),
594 [REGSET_HW_WATCH] = {
595 .core_note_type = NT_ARM_HW_WATCH,
596 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
598 .align = sizeof(u32),
605 static const struct user_regset_view user_aarch64_view = {
606 .name = "aarch64", .e_machine = EM_AARCH64,
607 .regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets)
611 #include <linux/compat.h>
618 static int compat_gpr_get(struct task_struct *target,
619 const struct user_regset *regset,
620 unsigned int pos, unsigned int count,
621 void *kbuf, void __user *ubuf)
624 unsigned int i, start, num_regs;
626 /* Calculate the number of AArch32 registers contained in count */
627 num_regs = count / regset->size;
629 /* Convert pos into an register number */
630 start = pos / regset->size;
632 if (start + num_regs > regset->n)
635 for (i = 0; i < num_regs; ++i) {
636 unsigned int idx = start + i;
641 reg = task_pt_regs(target)->pc;
644 reg = task_pt_regs(target)->pstate;
647 reg = task_pt_regs(target)->orig_x0;
650 reg = task_pt_regs(target)->regs[idx];
653 ret = copy_to_user(ubuf, ®, sizeof(reg));
663 static int compat_gpr_set(struct task_struct *target,
664 const struct user_regset *regset,
665 unsigned int pos, unsigned int count,
666 const void *kbuf, const void __user *ubuf)
668 struct pt_regs newregs;
670 unsigned int i, start, num_regs;
672 /* Calculate the number of AArch32 registers contained in count */
673 num_regs = count / regset->size;
675 /* Convert pos into an register number */
676 start = pos / regset->size;
678 if (start + num_regs > regset->n)
681 newregs = *task_pt_regs(target);
683 for (i = 0; i < num_regs; ++i) {
684 unsigned int idx = start + i;
687 ret = copy_from_user(®, ubuf, sizeof(reg));
698 newregs.pstate = reg;
701 newregs.orig_x0 = reg;
704 newregs.regs[idx] = reg;
709 if (valid_user_regs(&newregs.user_regs))
710 *task_pt_regs(target) = newregs;
717 static int compat_vfp_get(struct task_struct *target,
718 const struct user_regset *regset,
719 unsigned int pos, unsigned int count,
720 void *kbuf, void __user *ubuf)
722 struct user_fpsimd_state *uregs;
723 compat_ulong_t fpscr;
726 uregs = &target->thread.fpsimd_state.user_fpsimd;
729 * The VFP registers are packed into the fpsimd_state, so they all sit
730 * nicely together for us. We just need to create the fpscr separately.
732 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
733 VFP_STATE_SIZE - sizeof(compat_ulong_t));
736 fpscr = (uregs->fpsr & VFP_FPSCR_STAT_MASK) |
737 (uregs->fpcr & VFP_FPSCR_CTRL_MASK);
738 ret = put_user(fpscr, (compat_ulong_t *)ubuf);
744 static int compat_vfp_set(struct task_struct *target,
745 const struct user_regset *regset,
746 unsigned int pos, unsigned int count,
747 const void *kbuf, const void __user *ubuf)
749 struct user_fpsimd_state *uregs;
750 compat_ulong_t fpscr;
753 if (pos + count > VFP_STATE_SIZE)
756 uregs = &target->thread.fpsimd_state.user_fpsimd;
758 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
759 VFP_STATE_SIZE - sizeof(compat_ulong_t));
762 ret = get_user(fpscr, (compat_ulong_t *)ubuf);
763 uregs->fpsr = fpscr & VFP_FPSCR_STAT_MASK;
764 uregs->fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
770 static const struct user_regset aarch32_regsets[] = {
771 [REGSET_COMPAT_GPR] = {
772 .core_note_type = NT_PRSTATUS,
773 .n = COMPAT_ELF_NGREG,
774 .size = sizeof(compat_elf_greg_t),
775 .align = sizeof(compat_elf_greg_t),
776 .get = compat_gpr_get,
777 .set = compat_gpr_set
779 [REGSET_COMPAT_VFP] = {
780 .core_note_type = NT_ARM_VFP,
781 .n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
782 .size = sizeof(compat_ulong_t),
783 .align = sizeof(compat_ulong_t),
784 .get = compat_vfp_get,
785 .set = compat_vfp_set
789 static const struct user_regset_view user_aarch32_view = {
790 .name = "aarch32", .e_machine = EM_ARM,
791 .regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets)
794 static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
795 compat_ulong_t __user *ret)
802 if (off == COMPAT_PT_TEXT_ADDR)
803 tmp = tsk->mm->start_code;
804 else if (off == COMPAT_PT_DATA_ADDR)
805 tmp = tsk->mm->start_data;
806 else if (off == COMPAT_PT_TEXT_END_ADDR)
807 tmp = tsk->mm->end_code;
808 else if (off < sizeof(compat_elf_gregset_t))
809 return copy_regset_to_user(tsk, &user_aarch32_view,
810 REGSET_COMPAT_GPR, off,
811 sizeof(compat_ulong_t), ret);
812 else if (off >= COMPAT_USER_SZ)
817 return put_user(tmp, ret);
820 static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off,
825 if (off & 3 || off >= COMPAT_USER_SZ)
828 if (off >= sizeof(compat_elf_gregset_t))
831 ret = copy_regset_from_user(tsk, &user_aarch32_view,
832 REGSET_COMPAT_GPR, off,
833 sizeof(compat_ulong_t),
838 #ifdef CONFIG_HAVE_HW_BREAKPOINT
841 * Convert a virtual register number into an index for a thread_info
842 * breakpoint array. Breakpoints are identified using positive numbers
843 * whilst watchpoints are negative. The registers are laid out as pairs
844 * of (address, control), each pair mapping to a unique hw_breakpoint struct.
845 * Register 0 is reserved for describing resource information.
847 static int compat_ptrace_hbp_num_to_idx(compat_long_t num)
849 return (abs(num) - 1) >> 1;
852 static int compat_ptrace_hbp_get_resource_info(u32 *kdata)
854 u8 num_brps, num_wrps, debug_arch, wp_len;
857 num_brps = hw_breakpoint_slots(TYPE_INST);
858 num_wrps = hw_breakpoint_slots(TYPE_DATA);
860 debug_arch = debug_monitors_arch();
874 static int compat_ptrace_hbp_get(unsigned int note_type,
875 struct task_struct *tsk,
882 int err, idx = compat_ptrace_hbp_num_to_idx(num);;
885 err = ptrace_hbp_get_addr(note_type, tsk, idx, &addr);
888 err = ptrace_hbp_get_ctrl(note_type, tsk, idx, &ctrl);
895 static int compat_ptrace_hbp_set(unsigned int note_type,
896 struct task_struct *tsk,
903 int err, idx = compat_ptrace_hbp_num_to_idx(num);
907 err = ptrace_hbp_set_addr(note_type, tsk, idx, addr);
910 err = ptrace_hbp_set_ctrl(note_type, tsk, idx, ctrl);
916 static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
917 compat_ulong_t __user *data)
921 mm_segment_t old_fs = get_fs();
926 ret = compat_ptrace_hbp_get(NT_ARM_HW_WATCH, tsk, num, &kdata);
928 } else if (num == 0) {
929 ret = compat_ptrace_hbp_get_resource_info(&kdata);
932 ret = compat_ptrace_hbp_get(NT_ARM_HW_BREAK, tsk, num, &kdata);
937 ret = put_user(kdata, data);
942 static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
943 compat_ulong_t __user *data)
947 mm_segment_t old_fs = get_fs();
952 ret = get_user(kdata, data);
958 ret = compat_ptrace_hbp_set(NT_ARM_HW_WATCH, tsk, num, &kdata);
960 ret = compat_ptrace_hbp_set(NT_ARM_HW_BREAK, tsk, num, &kdata);
965 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
967 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
968 compat_ulong_t caddr, compat_ulong_t cdata)
970 unsigned long addr = caddr;
971 unsigned long data = cdata;
972 void __user *datap = compat_ptr(data);
977 ret = compat_ptrace_read_user(child, addr, datap);
981 ret = compat_ptrace_write_user(child, addr, data);
984 case COMPAT_PTRACE_GETREGS:
985 ret = copy_regset_to_user(child,
988 0, sizeof(compat_elf_gregset_t),
992 case COMPAT_PTRACE_SETREGS:
993 ret = copy_regset_from_user(child,
996 0, sizeof(compat_elf_gregset_t),
1000 case COMPAT_PTRACE_GET_THREAD_AREA:
1001 ret = put_user((compat_ulong_t)child->thread.tp_value,
1002 (compat_ulong_t __user *)datap);
1005 case COMPAT_PTRACE_SET_SYSCALL:
1006 task_pt_regs(child)->syscallno = data;
1010 case COMPAT_PTRACE_GETVFPREGS:
1011 ret = copy_regset_to_user(child,
1018 case COMPAT_PTRACE_SETVFPREGS:
1019 ret = copy_regset_from_user(child,
1026 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1027 case COMPAT_PTRACE_GETHBPREGS:
1028 ret = compat_ptrace_gethbpregs(child, addr, datap);
1031 case COMPAT_PTRACE_SETHBPREGS:
1032 ret = compat_ptrace_sethbpregs(child, addr, datap);
1037 ret = compat_ptrace_request(child, request, addr,
1044 #endif /* CONFIG_COMPAT */
1046 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1048 #ifdef CONFIG_COMPAT
1049 if (is_compat_thread(task_thread_info(task)))
1050 return &user_aarch32_view;
1052 return &user_aarch64_view;
1055 long arch_ptrace(struct task_struct *child, long request,
1056 unsigned long addr, unsigned long data)
1058 return ptrace_request(child, request, addr, data);
1061 asmlinkage int syscall_trace(int dir, struct pt_regs *regs)
1063 unsigned long saved_reg;
1065 if (!test_thread_flag(TIF_SYSCALL_TRACE))
1066 return regs->syscallno;
1068 if (is_compat_task()) {
1069 /* AArch32 uses ip (r12) for scratch */
1070 saved_reg = regs->regs[12];
1071 regs->regs[12] = dir;
1074 * Save X7. X7 is used to denote syscall entry/exit:
1075 * X7 = 0 -> entry, = 1 -> exit
1077 saved_reg = regs->regs[7];
1078 regs->regs[7] = dir;
1082 tracehook_report_syscall_exit(regs, 0);
1083 else if (tracehook_report_syscall_entry(regs))
1084 regs->syscallno = ~0UL;
1086 if (is_compat_task())
1087 regs->regs[12] = saved_reg;
1089 regs->regs[7] = saved_reg;
1091 return regs->syscallno;