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/seccomp.h>
31 #include <linux/security.h>
32 #include <linux/init.h>
33 #include <linux/signal.h>
34 #include <linux/uaccess.h>
35 #include <linux/perf_event.h>
36 #include <linux/hw_breakpoint.h>
37 #include <linux/regset.h>
38 #include <linux/tracehook.h>
39 #include <linux/elf.h>
41 #include <asm/compat.h>
42 #include <asm/debug-monitors.h>
43 #include <asm/pgtable.h>
44 #include <asm/syscall.h>
45 #include <asm/traps.h>
46 #include <asm/system_misc.h>
48 #define CREATE_TRACE_POINTS
49 #include <trace/events/syscalls.h>
52 * TODO: does not yet catch signals sent when the child dies.
53 * in exit.c or in signal.c.
57 * Called by kernel/ptrace.c when detaching..
59 void ptrace_disable(struct task_struct *child)
62 * This would be better off in core code, but PTRACE_DETACH has
63 * grown its fair share of arch-specific worts and changing it
64 * is likely to cause regressions on obscure architectures.
66 user_disable_single_step(child);
69 #ifdef CONFIG_HAVE_HW_BREAKPOINT
71 * Handle hitting a HW-breakpoint.
73 static void ptrace_hbptriggered(struct perf_event *bp,
74 struct perf_sample_data *data,
77 struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
81 .si_code = TRAP_HWBKPT,
82 .si_addr = (void __user *)(bkpt->trigger),
88 if (!is_compat_task())
91 for (i = 0; i < ARM_MAX_BRP; ++i) {
92 if (current->thread.debug.hbp_break[i] == bp) {
93 info.si_errno = (i << 1) + 1;
98 for (i = 0; i < ARM_MAX_WRP; ++i) {
99 if (current->thread.debug.hbp_watch[i] == bp) {
100 info.si_errno = -((i << 1) + 1);
107 force_sig_info(SIGTRAP, &info, current);
111 * Unregister breakpoints from this task and reset the pointers in
114 void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
117 struct thread_struct *t = &tsk->thread;
119 for (i = 0; i < ARM_MAX_BRP; i++) {
120 if (t->debug.hbp_break[i]) {
121 unregister_hw_breakpoint(t->debug.hbp_break[i]);
122 t->debug.hbp_break[i] = NULL;
126 for (i = 0; i < ARM_MAX_WRP; i++) {
127 if (t->debug.hbp_watch[i]) {
128 unregister_hw_breakpoint(t->debug.hbp_watch[i]);
129 t->debug.hbp_watch[i] = NULL;
134 void ptrace_hw_copy_thread(struct task_struct *tsk)
136 memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
139 static struct perf_event *ptrace_hbp_get_event(unsigned int note_type,
140 struct task_struct *tsk,
143 struct perf_event *bp = ERR_PTR(-EINVAL);
146 case NT_ARM_HW_BREAK:
147 if (idx < ARM_MAX_BRP)
148 bp = tsk->thread.debug.hbp_break[idx];
150 case NT_ARM_HW_WATCH:
151 if (idx < ARM_MAX_WRP)
152 bp = tsk->thread.debug.hbp_watch[idx];
159 static int ptrace_hbp_set_event(unsigned int note_type,
160 struct task_struct *tsk,
162 struct perf_event *bp)
167 case NT_ARM_HW_BREAK:
168 if (idx < ARM_MAX_BRP) {
169 tsk->thread.debug.hbp_break[idx] = bp;
173 case NT_ARM_HW_WATCH:
174 if (idx < ARM_MAX_WRP) {
175 tsk->thread.debug.hbp_watch[idx] = bp;
184 static struct perf_event *ptrace_hbp_create(unsigned int note_type,
185 struct task_struct *tsk,
188 struct perf_event *bp;
189 struct perf_event_attr attr;
193 case NT_ARM_HW_BREAK:
194 type = HW_BREAKPOINT_X;
196 case NT_ARM_HW_WATCH:
197 type = HW_BREAKPOINT_RW;
200 return ERR_PTR(-EINVAL);
203 ptrace_breakpoint_init(&attr);
206 * Initialise fields to sane defaults
207 * (i.e. values that will pass validation).
210 attr.bp_len = HW_BREAKPOINT_LEN_4;
214 bp = register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, tsk);
218 err = ptrace_hbp_set_event(note_type, tsk, idx, bp);
225 static int ptrace_hbp_fill_attr_ctrl(unsigned int note_type,
226 struct arch_hw_breakpoint_ctrl ctrl,
227 struct perf_event_attr *attr)
229 int err, len, type, disabled = !ctrl.enabled;
231 attr->disabled = disabled;
235 err = arch_bp_generic_fields(ctrl, &len, &type);
240 case NT_ARM_HW_BREAK:
241 if ((type & HW_BREAKPOINT_X) != type)
244 case NT_ARM_HW_WATCH:
245 if ((type & HW_BREAKPOINT_RW) != type)
253 attr->bp_type = type;
258 static int ptrace_hbp_get_resource_info(unsigned int note_type, u32 *info)
264 case NT_ARM_HW_BREAK:
265 num = hw_breakpoint_slots(TYPE_INST);
267 case NT_ARM_HW_WATCH:
268 num = hw_breakpoint_slots(TYPE_DATA);
274 reg |= debug_monitors_arch();
282 static int ptrace_hbp_get_ctrl(unsigned int note_type,
283 struct task_struct *tsk,
287 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
292 *ctrl = bp ? encode_ctrl_reg(counter_arch_bp(bp)->ctrl) : 0;
296 static int ptrace_hbp_get_addr(unsigned int note_type,
297 struct task_struct *tsk,
301 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
306 *addr = bp ? bp->attr.bp_addr : 0;
310 static struct perf_event *ptrace_hbp_get_initialised_bp(unsigned int note_type,
311 struct task_struct *tsk,
314 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
317 bp = ptrace_hbp_create(note_type, tsk, idx);
322 static int ptrace_hbp_set_ctrl(unsigned int note_type,
323 struct task_struct *tsk,
328 struct perf_event *bp;
329 struct perf_event_attr attr;
330 struct arch_hw_breakpoint_ctrl ctrl;
332 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
339 decode_ctrl_reg(uctrl, &ctrl);
340 err = ptrace_hbp_fill_attr_ctrl(note_type, ctrl, &attr);
344 return modify_user_hw_breakpoint(bp, &attr);
347 static int ptrace_hbp_set_addr(unsigned int note_type,
348 struct task_struct *tsk,
353 struct perf_event *bp;
354 struct perf_event_attr attr;
356 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
364 err = modify_user_hw_breakpoint(bp, &attr);
368 #define PTRACE_HBP_ADDR_SZ sizeof(u64)
369 #define PTRACE_HBP_CTRL_SZ sizeof(u32)
370 #define PTRACE_HBP_PAD_SZ sizeof(u32)
372 static int hw_break_get(struct task_struct *target,
373 const struct user_regset *regset,
374 unsigned int pos, unsigned int count,
375 void *kbuf, void __user *ubuf)
377 unsigned int note_type = regset->core_note_type;
378 int ret, idx = 0, offset, limit;
383 ret = ptrace_hbp_get_resource_info(note_type, &info);
387 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0,
393 offset = offsetof(struct user_hwdebug_state, pad);
394 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, offset,
395 offset + PTRACE_HBP_PAD_SZ);
399 /* (address, ctrl) registers */
400 offset = offsetof(struct user_hwdebug_state, dbg_regs);
401 limit = regset->n * regset->size;
402 while (count && offset < limit) {
403 ret = ptrace_hbp_get_addr(note_type, target, idx, &addr);
406 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &addr,
407 offset, offset + PTRACE_HBP_ADDR_SZ);
410 offset += PTRACE_HBP_ADDR_SZ;
412 ret = ptrace_hbp_get_ctrl(note_type, target, idx, &ctrl);
415 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &ctrl,
416 offset, offset + PTRACE_HBP_CTRL_SZ);
419 offset += PTRACE_HBP_CTRL_SZ;
421 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
423 offset + PTRACE_HBP_PAD_SZ);
426 offset += PTRACE_HBP_PAD_SZ;
433 static int hw_break_set(struct task_struct *target,
434 const struct user_regset *regset,
435 unsigned int pos, unsigned int count,
436 const void *kbuf, const void __user *ubuf)
438 unsigned int note_type = regset->core_note_type;
439 int ret, idx = 0, offset, limit;
443 /* Resource info and pad */
444 offset = offsetof(struct user_hwdebug_state, dbg_regs);
445 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
449 /* (address, ctrl) registers */
450 limit = regset->n * regset->size;
451 while (count && offset < limit) {
452 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
453 offset, offset + PTRACE_HBP_ADDR_SZ);
456 ret = ptrace_hbp_set_addr(note_type, target, idx, addr);
459 offset += PTRACE_HBP_ADDR_SZ;
461 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
462 offset, offset + PTRACE_HBP_CTRL_SZ);
465 ret = ptrace_hbp_set_ctrl(note_type, target, idx, ctrl);
468 offset += PTRACE_HBP_CTRL_SZ;
470 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
472 offset + PTRACE_HBP_PAD_SZ);
475 offset += PTRACE_HBP_PAD_SZ;
481 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
483 static int gpr_get(struct task_struct *target,
484 const struct user_regset *regset,
485 unsigned int pos, unsigned int count,
486 void *kbuf, void __user *ubuf)
488 struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
489 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
492 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
493 unsigned int pos, unsigned int count,
494 const void *kbuf, const void __user *ubuf)
497 struct user_pt_regs newregs;
499 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
503 if (!valid_user_regs(&newregs))
506 task_pt_regs(target)->user_regs = newregs;
511 * TODO: update fp accessors for lazy context switching (sync/flush hwstate)
513 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
514 unsigned int pos, unsigned int count,
515 void *kbuf, void __user *ubuf)
517 struct user_fpsimd_state *uregs;
518 uregs = &target->thread.fpsimd_state.user_fpsimd;
519 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
522 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
523 unsigned int pos, unsigned int count,
524 const void *kbuf, const void __user *ubuf)
527 struct user_fpsimd_state newstate;
529 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
533 target->thread.fpsimd_state.user_fpsimd = newstate;
534 fpsimd_flush_task_state(target);
538 static int tls_get(struct task_struct *target, const struct user_regset *regset,
539 unsigned int pos, unsigned int count,
540 void *kbuf, void __user *ubuf)
542 unsigned long *tls = &target->thread.tp_value;
543 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, tls, 0, -1);
546 static int tls_set(struct task_struct *target, const struct user_regset *regset,
547 unsigned int pos, unsigned int count,
548 const void *kbuf, const void __user *ubuf)
553 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
557 target->thread.tp_value = tls;
561 static int system_call_get(struct task_struct *target,
562 const struct user_regset *regset,
563 unsigned int pos, unsigned int count,
564 void *kbuf, void __user *ubuf)
566 int syscallno = task_pt_regs(target)->syscallno;
568 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
572 static int system_call_set(struct task_struct *target,
573 const struct user_regset *regset,
574 unsigned int pos, unsigned int count,
575 const void *kbuf, const void __user *ubuf)
579 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &syscallno, 0, -1);
583 task_pt_regs(target)->syscallno = syscallno;
587 enum aarch64_regset {
591 #ifdef CONFIG_HAVE_HW_BREAKPOINT
598 static const struct user_regset aarch64_regsets[] = {
600 .core_note_type = NT_PRSTATUS,
601 .n = sizeof(struct user_pt_regs) / sizeof(u64),
603 .align = sizeof(u64),
608 .core_note_type = NT_PRFPREG,
609 .n = sizeof(struct user_fpsimd_state) / sizeof(u32),
611 * We pretend we have 32-bit registers because the fpsr and
612 * fpcr are 32-bits wide.
615 .align = sizeof(u32),
620 .core_note_type = NT_ARM_TLS,
622 .size = sizeof(void *),
623 .align = sizeof(void *),
627 #ifdef CONFIG_HAVE_HW_BREAKPOINT
628 [REGSET_HW_BREAK] = {
629 .core_note_type = NT_ARM_HW_BREAK,
630 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
632 .align = sizeof(u32),
636 [REGSET_HW_WATCH] = {
637 .core_note_type = NT_ARM_HW_WATCH,
638 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
640 .align = sizeof(u32),
645 [REGSET_SYSTEM_CALL] = {
646 .core_note_type = NT_ARM_SYSTEM_CALL,
649 .align = sizeof(int),
650 .get = system_call_get,
651 .set = system_call_set,
655 static const struct user_regset_view user_aarch64_view = {
656 .name = "aarch64", .e_machine = EM_AARCH64,
657 .regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets)
661 #include <linux/compat.h>
668 static int compat_gpr_get(struct task_struct *target,
669 const struct user_regset *regset,
670 unsigned int pos, unsigned int count,
671 void *kbuf, void __user *ubuf)
674 unsigned int i, start, num_regs;
676 /* Calculate the number of AArch32 registers contained in count */
677 num_regs = count / regset->size;
679 /* Convert pos into an register number */
680 start = pos / regset->size;
682 if (start + num_regs > regset->n)
685 for (i = 0; i < num_regs; ++i) {
686 unsigned int idx = start + i;
691 reg = task_pt_regs(target)->pc;
694 reg = task_pt_regs(target)->pstate;
697 reg = task_pt_regs(target)->orig_x0;
700 reg = task_pt_regs(target)->regs[idx];
704 memcpy(kbuf, ®, sizeof(reg));
707 ret = copy_to_user(ubuf, ®, sizeof(reg));
720 static int compat_gpr_set(struct task_struct *target,
721 const struct user_regset *regset,
722 unsigned int pos, unsigned int count,
723 const void *kbuf, const void __user *ubuf)
725 struct pt_regs newregs;
727 unsigned int i, start, num_regs;
729 /* Calculate the number of AArch32 registers contained in count */
730 num_regs = count / regset->size;
732 /* Convert pos into an register number */
733 start = pos / regset->size;
735 if (start + num_regs > regset->n)
738 newregs = *task_pt_regs(target);
740 for (i = 0; i < num_regs; ++i) {
741 unsigned int idx = start + i;
745 memcpy(®, kbuf, sizeof(reg));
748 ret = copy_from_user(®, ubuf, sizeof(reg));
762 newregs.pstate = reg;
765 newregs.orig_x0 = reg;
768 newregs.regs[idx] = reg;
773 if (valid_user_regs(&newregs.user_regs))
774 *task_pt_regs(target) = newregs;
781 static int compat_vfp_get(struct task_struct *target,
782 const struct user_regset *regset,
783 unsigned int pos, unsigned int count,
784 void *kbuf, void __user *ubuf)
786 struct user_fpsimd_state *uregs;
787 compat_ulong_t fpscr;
790 uregs = &target->thread.fpsimd_state.user_fpsimd;
793 * The VFP registers are packed into the fpsimd_state, so they all sit
794 * nicely together for us. We just need to create the fpscr separately.
796 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
797 VFP_STATE_SIZE - sizeof(compat_ulong_t));
800 fpscr = (uregs->fpsr & VFP_FPSCR_STAT_MASK) |
801 (uregs->fpcr & VFP_FPSCR_CTRL_MASK);
802 ret = put_user(fpscr, (compat_ulong_t *)ubuf);
808 static int compat_vfp_set(struct task_struct *target,
809 const struct user_regset *regset,
810 unsigned int pos, unsigned int count,
811 const void *kbuf, const void __user *ubuf)
813 struct user_fpsimd_state *uregs;
814 compat_ulong_t fpscr;
817 if (pos + count > VFP_STATE_SIZE)
820 uregs = &target->thread.fpsimd_state.user_fpsimd;
822 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
823 VFP_STATE_SIZE - sizeof(compat_ulong_t));
826 ret = get_user(fpscr, (compat_ulong_t *)ubuf);
827 uregs->fpsr = fpscr & VFP_FPSCR_STAT_MASK;
828 uregs->fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
831 fpsimd_flush_task_state(target);
835 static int compat_tls_get(struct task_struct *target,
836 const struct user_regset *regset, unsigned int pos,
837 unsigned int count, void *kbuf, void __user *ubuf)
839 compat_ulong_t tls = (compat_ulong_t)target->thread.tp_value;
840 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
843 static int compat_tls_set(struct task_struct *target,
844 const struct user_regset *regset, unsigned int pos,
845 unsigned int count, const void *kbuf,
846 const void __user *ubuf)
851 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
855 target->thread.tp_value = tls;
859 static const struct user_regset aarch32_regsets[] = {
860 [REGSET_COMPAT_GPR] = {
861 .core_note_type = NT_PRSTATUS,
862 .n = COMPAT_ELF_NGREG,
863 .size = sizeof(compat_elf_greg_t),
864 .align = sizeof(compat_elf_greg_t),
865 .get = compat_gpr_get,
866 .set = compat_gpr_set
868 [REGSET_COMPAT_VFP] = {
869 .core_note_type = NT_ARM_VFP,
870 .n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
871 .size = sizeof(compat_ulong_t),
872 .align = sizeof(compat_ulong_t),
873 .get = compat_vfp_get,
874 .set = compat_vfp_set
878 static const struct user_regset_view user_aarch32_view = {
879 .name = "aarch32", .e_machine = EM_ARM,
880 .regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets)
883 static const struct user_regset aarch32_ptrace_regsets[] = {
885 .core_note_type = NT_PRSTATUS,
886 .n = COMPAT_ELF_NGREG,
887 .size = sizeof(compat_elf_greg_t),
888 .align = sizeof(compat_elf_greg_t),
889 .get = compat_gpr_get,
890 .set = compat_gpr_set
893 .core_note_type = NT_ARM_VFP,
894 .n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
895 .size = sizeof(compat_ulong_t),
896 .align = sizeof(compat_ulong_t),
897 .get = compat_vfp_get,
898 .set = compat_vfp_set
901 .core_note_type = NT_ARM_TLS,
903 .size = sizeof(compat_ulong_t),
904 .align = sizeof(compat_ulong_t),
905 .get = compat_tls_get,
906 .set = compat_tls_set,
908 #ifdef CONFIG_HAVE_HW_BREAKPOINT
909 [REGSET_HW_BREAK] = {
910 .core_note_type = NT_ARM_HW_BREAK,
911 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
913 .align = sizeof(u32),
917 [REGSET_HW_WATCH] = {
918 .core_note_type = NT_ARM_HW_WATCH,
919 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
921 .align = sizeof(u32),
926 [REGSET_SYSTEM_CALL] = {
927 .core_note_type = NT_ARM_SYSTEM_CALL,
930 .align = sizeof(int),
931 .get = system_call_get,
932 .set = system_call_set,
936 static const struct user_regset_view user_aarch32_ptrace_view = {
937 .name = "aarch32", .e_machine = EM_ARM,
938 .regsets = aarch32_ptrace_regsets, .n = ARRAY_SIZE(aarch32_ptrace_regsets)
941 static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
942 compat_ulong_t __user *ret)
949 if (off == COMPAT_PT_TEXT_ADDR)
950 tmp = tsk->mm->start_code;
951 else if (off == COMPAT_PT_DATA_ADDR)
952 tmp = tsk->mm->start_data;
953 else if (off == COMPAT_PT_TEXT_END_ADDR)
954 tmp = tsk->mm->end_code;
955 else if (off < sizeof(compat_elf_gregset_t))
956 return copy_regset_to_user(tsk, &user_aarch32_view,
957 REGSET_COMPAT_GPR, off,
958 sizeof(compat_ulong_t), ret);
959 else if (off >= COMPAT_USER_SZ)
964 return put_user(tmp, ret);
967 static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off,
971 mm_segment_t old_fs = get_fs();
973 if (off & 3 || off >= COMPAT_USER_SZ)
976 if (off >= sizeof(compat_elf_gregset_t))
980 ret = copy_regset_from_user(tsk, &user_aarch32_view,
981 REGSET_COMPAT_GPR, off,
982 sizeof(compat_ulong_t),
989 #ifdef CONFIG_HAVE_HW_BREAKPOINT
992 * Convert a virtual register number into an index for a thread_info
993 * breakpoint array. Breakpoints are identified using positive numbers
994 * whilst watchpoints are negative. The registers are laid out as pairs
995 * of (address, control), each pair mapping to a unique hw_breakpoint struct.
996 * Register 0 is reserved for describing resource information.
998 static int compat_ptrace_hbp_num_to_idx(compat_long_t num)
1000 return (abs(num) - 1) >> 1;
1003 static int compat_ptrace_hbp_get_resource_info(u32 *kdata)
1005 u8 num_brps, num_wrps, debug_arch, wp_len;
1008 num_brps = hw_breakpoint_slots(TYPE_INST);
1009 num_wrps = hw_breakpoint_slots(TYPE_DATA);
1011 debug_arch = debug_monitors_arch();
1025 static int compat_ptrace_hbp_get(unsigned int note_type,
1026 struct task_struct *tsk,
1033 int err, idx = compat_ptrace_hbp_num_to_idx(num);;
1036 err = ptrace_hbp_get_addr(note_type, tsk, idx, &addr);
1039 err = ptrace_hbp_get_ctrl(note_type, tsk, idx, &ctrl);
1046 static int compat_ptrace_hbp_set(unsigned int note_type,
1047 struct task_struct *tsk,
1054 int err, idx = compat_ptrace_hbp_num_to_idx(num);
1058 err = ptrace_hbp_set_addr(note_type, tsk, idx, addr);
1061 err = ptrace_hbp_set_ctrl(note_type, tsk, idx, ctrl);
1067 static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
1068 compat_ulong_t __user *data)
1072 mm_segment_t old_fs = get_fs();
1077 ret = compat_ptrace_hbp_get(NT_ARM_HW_WATCH, tsk, num, &kdata);
1079 } else if (num == 0) {
1080 ret = compat_ptrace_hbp_get_resource_info(&kdata);
1083 ret = compat_ptrace_hbp_get(NT_ARM_HW_BREAK, tsk, num, &kdata);
1088 ret = put_user(kdata, data);
1093 static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
1094 compat_ulong_t __user *data)
1098 mm_segment_t old_fs = get_fs();
1103 ret = get_user(kdata, data);
1109 ret = compat_ptrace_hbp_set(NT_ARM_HW_WATCH, tsk, num, &kdata);
1111 ret = compat_ptrace_hbp_set(NT_ARM_HW_BREAK, tsk, num, &kdata);
1116 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
1118 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1119 compat_ulong_t caddr, compat_ulong_t cdata)
1121 unsigned long addr = caddr;
1122 unsigned long data = cdata;
1123 void __user *datap = compat_ptr(data);
1127 case PTRACE_PEEKUSR:
1128 ret = compat_ptrace_read_user(child, addr, datap);
1131 case PTRACE_POKEUSR:
1132 ret = compat_ptrace_write_user(child, addr, data);
1135 case COMPAT_PTRACE_GETREGS:
1136 ret = copy_regset_to_user(child,
1139 0, sizeof(compat_elf_gregset_t),
1143 case COMPAT_PTRACE_SETREGS:
1144 ret = copy_regset_from_user(child,
1147 0, sizeof(compat_elf_gregset_t),
1151 case COMPAT_PTRACE_GET_THREAD_AREA:
1152 ret = put_user((compat_ulong_t)child->thread.tp_value,
1153 (compat_ulong_t __user *)datap);
1156 case COMPAT_PTRACE_SET_SYSCALL:
1157 task_pt_regs(child)->syscallno = data;
1161 case COMPAT_PTRACE_GETVFPREGS:
1162 ret = copy_regset_to_user(child,
1169 case COMPAT_PTRACE_SETVFPREGS:
1170 ret = copy_regset_from_user(child,
1177 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1178 case COMPAT_PTRACE_GETHBPREGS:
1179 ret = compat_ptrace_gethbpregs(child, addr, datap);
1182 case COMPAT_PTRACE_SETHBPREGS:
1183 ret = compat_ptrace_sethbpregs(child, addr, datap);
1188 ret = compat_ptrace_request(child, request, addr,
1195 #endif /* CONFIG_COMPAT */
1197 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1199 #ifdef CONFIG_COMPAT
1201 * Core dumping of 32-bit tasks or compat ptrace requests must use the
1202 * user_aarch32_view compatible with arm32. Native ptrace requests on
1203 * 32-bit children use an extended user_aarch32_ptrace_view to allow
1204 * access to the TLS register.
1206 if (is_compat_task())
1207 return &user_aarch32_view;
1208 else if (is_compat_thread(task_thread_info(task)))
1209 return &user_aarch32_ptrace_view;
1211 return &user_aarch64_view;
1214 long arch_ptrace(struct task_struct *child, long request,
1215 unsigned long addr, unsigned long data)
1217 return ptrace_request(child, request, addr, data);
1220 enum ptrace_syscall_dir {
1221 PTRACE_SYSCALL_ENTER = 0,
1222 PTRACE_SYSCALL_EXIT,
1225 static void tracehook_report_syscall(struct pt_regs *regs,
1226 enum ptrace_syscall_dir dir)
1229 unsigned long saved_reg;
1232 * A scratch register (ip(r12) on AArch32, x7 on AArch64) is
1233 * used to denote syscall entry/exit:
1235 regno = (is_compat_task() ? 12 : 7);
1236 saved_reg = regs->regs[regno];
1237 regs->regs[regno] = dir;
1239 if (dir == PTRACE_SYSCALL_EXIT)
1240 tracehook_report_syscall_exit(regs, 0);
1241 else if (tracehook_report_syscall_entry(regs))
1242 regs->syscallno = ~0UL;
1244 regs->regs[regno] = saved_reg;
1247 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1249 /* Do the secure computing check first; failures should be fast. */
1250 if (secure_computing() == -1)
1253 if (test_thread_flag(TIF_SYSCALL_TRACE))
1254 tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
1256 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
1257 trace_sys_enter(regs, regs->syscallno);
1259 audit_syscall_entry(regs->syscallno, regs->orig_x0, regs->regs[1],
1260 regs->regs[2], regs->regs[3]);
1262 return regs->syscallno;
1265 asmlinkage void syscall_trace_exit(struct pt_regs *regs)
1267 audit_syscall_exit(regs);
1269 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
1270 trace_sys_exit(regs, regs_return_value(regs));
1272 if (test_thread_flag(TIF_SYSCALL_TRACE))
1273 tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);