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
)
239 err
= arch_bp_generic_fields(ctrl
, &len
, &type
);
244 case NT_ARM_HW_BREAK
:
245 if ((type
& HW_BREAKPOINT_X
) != type
)
248 case NT_ARM_HW_WATCH
:
249 if ((type
& HW_BREAKPOINT_RW
) != type
)
257 attr
->bp_type
= type
;
258 attr
->disabled
= !ctrl
.enabled
;
263 static int ptrace_hbp_get_resource_info(unsigned int note_type
, u32
*info
)
269 case NT_ARM_HW_BREAK
:
270 num
= hw_breakpoint_slots(TYPE_INST
);
272 case NT_ARM_HW_WATCH
:
273 num
= hw_breakpoint_slots(TYPE_DATA
);
279 reg
|= debug_monitors_arch();
287 static int ptrace_hbp_get_ctrl(unsigned int note_type
,
288 struct task_struct
*tsk
,
292 struct perf_event
*bp
= ptrace_hbp_get_event(note_type
, tsk
, idx
);
297 *ctrl
= bp
? encode_ctrl_reg(counter_arch_bp(bp
)->ctrl
) : 0;
301 static int ptrace_hbp_get_addr(unsigned int note_type
,
302 struct task_struct
*tsk
,
306 struct perf_event
*bp
= ptrace_hbp_get_event(note_type
, tsk
, idx
);
311 *addr
= bp
? bp
->attr
.bp_addr
: 0;
315 static struct perf_event
*ptrace_hbp_get_initialised_bp(unsigned int note_type
,
316 struct task_struct
*tsk
,
319 struct perf_event
*bp
= ptrace_hbp_get_event(note_type
, tsk
, idx
);
322 bp
= ptrace_hbp_create(note_type
, tsk
, idx
);
327 static int ptrace_hbp_set_ctrl(unsigned int note_type
,
328 struct task_struct
*tsk
,
333 struct perf_event
*bp
;
334 struct perf_event_attr attr
;
335 struct arch_hw_breakpoint_ctrl ctrl
;
337 bp
= ptrace_hbp_get_initialised_bp(note_type
, tsk
, idx
);
344 decode_ctrl_reg(uctrl
, &ctrl
);
345 err
= ptrace_hbp_fill_attr_ctrl(note_type
, ctrl
, &attr
);
349 return modify_user_hw_breakpoint(bp
, &attr
);
352 static int ptrace_hbp_set_addr(unsigned int note_type
,
353 struct task_struct
*tsk
,
358 struct perf_event
*bp
;
359 struct perf_event_attr attr
;
361 bp
= ptrace_hbp_get_initialised_bp(note_type
, tsk
, idx
);
369 err
= modify_user_hw_breakpoint(bp
, &attr
);
373 #define PTRACE_HBP_ADDR_SZ sizeof(u64)
374 #define PTRACE_HBP_CTRL_SZ sizeof(u32)
375 #define PTRACE_HBP_REG_OFF sizeof(u32)
377 static int hw_break_get(struct task_struct
*target
,
378 const struct user_regset
*regset
,
379 unsigned int pos
, unsigned int count
,
380 void *kbuf
, void __user
*ubuf
)
382 unsigned int note_type
= regset
->core_note_type
;
383 int ret
, idx
= 0, offset
= PTRACE_HBP_REG_OFF
, limit
;
388 ret
= ptrace_hbp_get_resource_info(note_type
, &info
);
392 ret
= user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
, &info
, 0, 4);
396 /* (address, ctrl) registers */
397 limit
= regset
->n
* regset
->size
;
398 while (count
&& offset
< limit
) {
399 ret
= ptrace_hbp_get_addr(note_type
, target
, idx
, &addr
);
402 ret
= user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
, &addr
,
403 offset
, offset
+ PTRACE_HBP_ADDR_SZ
);
406 offset
+= PTRACE_HBP_ADDR_SZ
;
408 ret
= ptrace_hbp_get_ctrl(note_type
, target
, idx
, &ctrl
);
411 ret
= user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
, &ctrl
,
412 offset
, offset
+ PTRACE_HBP_CTRL_SZ
);
415 offset
+= PTRACE_HBP_CTRL_SZ
;
422 static int hw_break_set(struct task_struct
*target
,
423 const struct user_regset
*regset
,
424 unsigned int pos
, unsigned int count
,
425 const void *kbuf
, const void __user
*ubuf
)
427 unsigned int note_type
= regset
->core_note_type
;
428 int ret
, idx
= 0, offset
= PTRACE_HBP_REG_OFF
, limit
;
433 ret
= user_regset_copyin_ignore(&pos
, &count
, &kbuf
, &ubuf
, 0, 4);
437 /* (address, ctrl) registers */
438 limit
= regset
->n
* regset
->size
;
439 while (count
&& offset
< limit
) {
440 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
, &addr
,
441 offset
, offset
+ PTRACE_HBP_ADDR_SZ
);
444 ret
= ptrace_hbp_set_addr(note_type
, target
, idx
, addr
);
447 offset
+= PTRACE_HBP_ADDR_SZ
;
449 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
, &ctrl
,
450 offset
, offset
+ PTRACE_HBP_CTRL_SZ
);
453 ret
= ptrace_hbp_set_ctrl(note_type
, target
, idx
, ctrl
);
456 offset
+= PTRACE_HBP_CTRL_SZ
;
462 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
464 static int gpr_get(struct task_struct
*target
,
465 const struct user_regset
*regset
,
466 unsigned int pos
, unsigned int count
,
467 void *kbuf
, void __user
*ubuf
)
469 struct user_pt_regs
*uregs
= &task_pt_regs(target
)->user_regs
;
470 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
, uregs
, 0, -1);
473 static int gpr_set(struct task_struct
*target
, const struct user_regset
*regset
,
474 unsigned int pos
, unsigned int count
,
475 const void *kbuf
, const void __user
*ubuf
)
478 struct user_pt_regs newregs
;
480 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
, &newregs
, 0, -1);
484 if (!valid_user_regs(&newregs
))
487 task_pt_regs(target
)->user_regs
= newregs
;
492 * TODO: update fp accessors for lazy context switching (sync/flush hwstate)
494 static int fpr_get(struct task_struct
*target
, const struct user_regset
*regset
,
495 unsigned int pos
, unsigned int count
,
496 void *kbuf
, void __user
*ubuf
)
498 struct user_fpsimd_state
*uregs
;
499 uregs
= &target
->thread
.fpsimd_state
.user_fpsimd
;
500 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
, uregs
, 0, -1);
503 static int fpr_set(struct task_struct
*target
, const struct user_regset
*regset
,
504 unsigned int pos
, unsigned int count
,
505 const void *kbuf
, const void __user
*ubuf
)
508 struct user_fpsimd_state newstate
;
510 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
, &newstate
, 0, -1);
514 target
->thread
.fpsimd_state
.user_fpsimd
= newstate
;
518 static int tls_get(struct task_struct
*target
, const struct user_regset
*regset
,
519 unsigned int pos
, unsigned int count
,
520 void *kbuf
, void __user
*ubuf
)
522 unsigned long *tls
= &target
->thread
.tp_value
;
523 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
, tls
, 0, -1);
526 static int tls_set(struct task_struct
*target
, const struct user_regset
*regset
,
527 unsigned int pos
, unsigned int count
,
528 const void *kbuf
, const void __user
*ubuf
)
533 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
, &tls
, 0, -1);
537 target
->thread
.tp_value
= tls
;
541 enum aarch64_regset
{
545 #ifdef CONFIG_HAVE_HW_BREAKPOINT
551 static const struct user_regset aarch64_regsets
[] = {
553 .core_note_type
= NT_PRSTATUS
,
554 .n
= sizeof(struct user_pt_regs
) / sizeof(u64
),
556 .align
= sizeof(u64
),
561 .core_note_type
= NT_PRFPREG
,
562 .n
= sizeof(struct user_fpsimd_state
) / sizeof(u32
),
564 * We pretend we have 32-bit registers because the fpsr and
565 * fpcr are 32-bits wide.
568 .align
= sizeof(u32
),
573 .core_note_type
= NT_ARM_TLS
,
575 .size
= sizeof(void *),
576 .align
= sizeof(void *),
580 #ifdef CONFIG_HAVE_HW_BREAKPOINT
581 [REGSET_HW_BREAK
] = {
582 .core_note_type
= NT_ARM_HW_BREAK
,
583 .n
= sizeof(struct user_hwdebug_state
) / sizeof(u32
),
585 .align
= sizeof(u32
),
589 [REGSET_HW_WATCH
] = {
590 .core_note_type
= NT_ARM_HW_WATCH
,
591 .n
= sizeof(struct user_hwdebug_state
) / sizeof(u32
),
593 .align
= sizeof(u32
),
600 static const struct user_regset_view user_aarch64_view
= {
601 .name
= "aarch64", .e_machine
= EM_AARCH64
,
602 .regsets
= aarch64_regsets
, .n
= ARRAY_SIZE(aarch64_regsets
)
606 #include <linux/compat.h>
613 static int compat_gpr_get(struct task_struct
*target
,
614 const struct user_regset
*regset
,
615 unsigned int pos
, unsigned int count
,
616 void *kbuf
, void __user
*ubuf
)
619 unsigned int i
, start
, num_regs
;
621 /* Calculate the number of AArch32 registers contained in count */
622 num_regs
= count
/ regset
->size
;
624 /* Convert pos into an register number */
625 start
= pos
/ regset
->size
;
627 if (start
+ num_regs
> regset
->n
)
630 for (i
= 0; i
< num_regs
; ++i
) {
631 unsigned int idx
= start
+ i
;
636 reg
= (void *)&task_pt_regs(target
)->pc
;
639 reg
= (void *)&task_pt_regs(target
)->pstate
;
642 reg
= (void *)&task_pt_regs(target
)->orig_x0
;
645 reg
= (void *)&task_pt_regs(target
)->regs
[idx
];
648 ret
= copy_to_user(ubuf
, reg
, sizeof(compat_ulong_t
));
653 ubuf
+= sizeof(compat_ulong_t
);
659 static int compat_gpr_set(struct task_struct
*target
,
660 const struct user_regset
*regset
,
661 unsigned int pos
, unsigned int count
,
662 const void *kbuf
, const void __user
*ubuf
)
664 struct pt_regs newregs
;
666 unsigned int i
, start
, num_regs
;
668 /* Calculate the number of AArch32 registers contained in count */
669 num_regs
= count
/ regset
->size
;
671 /* Convert pos into an register number */
672 start
= pos
/ regset
->size
;
674 if (start
+ num_regs
> regset
->n
)
677 newregs
= *task_pt_regs(target
);
679 for (i
= 0; i
< num_regs
; ++i
) {
680 unsigned int idx
= start
+ i
;
685 reg
= (void *)&newregs
.pc
;
688 reg
= (void *)&newregs
.pstate
;
691 reg
= (void *)&newregs
.orig_x0
;
694 reg
= (void *)&newregs
.regs
[idx
];
697 ret
= copy_from_user(reg
, ubuf
, sizeof(compat_ulong_t
));
702 ubuf
+= sizeof(compat_ulong_t
);
705 if (valid_user_regs(&newregs
.user_regs
))
706 *task_pt_regs(target
) = newregs
;
714 static int compat_vfp_get(struct task_struct
*target
,
715 const struct user_regset
*regset
,
716 unsigned int pos
, unsigned int count
,
717 void *kbuf
, void __user
*ubuf
)
719 struct user_fpsimd_state
*uregs
;
720 compat_ulong_t fpscr
;
723 uregs
= &target
->thread
.fpsimd_state
.user_fpsimd
;
726 * The VFP registers are packed into the fpsimd_state, so they all sit
727 * nicely together for us. We just need to create the fpscr separately.
729 ret
= user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
, uregs
, 0,
730 VFP_STATE_SIZE
- sizeof(compat_ulong_t
));
733 fpscr
= (uregs
->fpsr
& VFP_FPSCR_STAT_MASK
) |
734 (uregs
->fpcr
& VFP_FPSCR_CTRL_MASK
);
735 ret
= put_user(fpscr
, (compat_ulong_t
*)ubuf
);
741 static int compat_vfp_set(struct task_struct
*target
,
742 const struct user_regset
*regset
,
743 unsigned int pos
, unsigned int count
,
744 const void *kbuf
, const void __user
*ubuf
)
746 struct user_fpsimd_state
*uregs
;
747 compat_ulong_t fpscr
;
750 if (pos
+ count
> VFP_STATE_SIZE
)
753 uregs
= &target
->thread
.fpsimd_state
.user_fpsimd
;
755 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
, uregs
, 0,
756 VFP_STATE_SIZE
- sizeof(compat_ulong_t
));
759 ret
= get_user(fpscr
, (compat_ulong_t
*)ubuf
);
760 uregs
->fpsr
= fpscr
& VFP_FPSCR_STAT_MASK
;
761 uregs
->fpcr
= fpscr
& VFP_FPSCR_CTRL_MASK
;
767 static const struct user_regset aarch32_regsets
[] = {
768 [REGSET_COMPAT_GPR
] = {
769 .core_note_type
= NT_PRSTATUS
,
770 .n
= COMPAT_ELF_NGREG
,
771 .size
= sizeof(compat_elf_greg_t
),
772 .align
= sizeof(compat_elf_greg_t
),
773 .get
= compat_gpr_get
,
774 .set
= compat_gpr_set
776 [REGSET_COMPAT_VFP
] = {
777 .core_note_type
= NT_ARM_VFP
,
778 .n
= VFP_STATE_SIZE
/ sizeof(compat_ulong_t
),
779 .size
= sizeof(compat_ulong_t
),
780 .align
= sizeof(compat_ulong_t
),
781 .get
= compat_vfp_get
,
782 .set
= compat_vfp_set
786 static const struct user_regset_view user_aarch32_view
= {
787 .name
= "aarch32", .e_machine
= EM_ARM
,
788 .regsets
= aarch32_regsets
, .n
= ARRAY_SIZE(aarch32_regsets
)
791 int aarch32_break_trap(struct pt_regs
*regs
)
795 void __user
*pc
= (void __user
*)instruction_pointer(regs
);
797 if (compat_thumb_mode(regs
)) {
798 /* get 16-bit Thumb instruction */
799 get_user(instr
, (u16 __user
*)pc
);
800 if (instr
== AARCH32_BREAK_THUMB2_LO
) {
801 /* get second half of 32-bit Thumb-2 instruction */
802 get_user(instr
, (u16 __user
*)(pc
+ 2));
803 bp
= instr
== AARCH32_BREAK_THUMB2_HI
;
805 bp
= instr
== AARCH32_BREAK_THUMB
;
808 /* 32-bit ARM instruction */
809 get_user(instr
, (u32 __user
*)pc
);
810 bp
= (instr
& ~0xf0000000) == AARCH32_BREAK_ARM
;
814 return ptrace_break(regs
);
818 static int compat_ptrace_read_user(struct task_struct
*tsk
, compat_ulong_t off
,
819 compat_ulong_t __user
*ret
)
826 if (off
== COMPAT_PT_TEXT_ADDR
)
827 tmp
= tsk
->mm
->start_code
;
828 else if (off
== COMPAT_PT_DATA_ADDR
)
829 tmp
= tsk
->mm
->start_data
;
830 else if (off
== COMPAT_PT_TEXT_END_ADDR
)
831 tmp
= tsk
->mm
->end_code
;
832 else if (off
< sizeof(compat_elf_gregset_t
))
833 return copy_regset_to_user(tsk
, &user_aarch32_view
,
834 REGSET_COMPAT_GPR
, off
,
835 sizeof(compat_ulong_t
), ret
);
836 else if (off
>= COMPAT_USER_SZ
)
841 return put_user(tmp
, ret
);
844 static int compat_ptrace_write_user(struct task_struct
*tsk
, compat_ulong_t off
,
849 if (off
& 3 || off
>= COMPAT_USER_SZ
)
852 if (off
>= sizeof(compat_elf_gregset_t
))
855 ret
= copy_regset_from_user(tsk
, &user_aarch32_view
,
856 REGSET_COMPAT_GPR
, off
,
857 sizeof(compat_ulong_t
),
862 #ifdef CONFIG_HAVE_HW_BREAKPOINT
865 * Convert a virtual register number into an index for a thread_info
866 * breakpoint array. Breakpoints are identified using positive numbers
867 * whilst watchpoints are negative. The registers are laid out as pairs
868 * of (address, control), each pair mapping to a unique hw_breakpoint struct.
869 * Register 0 is reserved for describing resource information.
871 static int compat_ptrace_hbp_num_to_idx(compat_long_t num
)
873 return (abs(num
) - 1) >> 1;
876 static int compat_ptrace_hbp_get_resource_info(u32
*kdata
)
878 u8 num_brps
, num_wrps
, debug_arch
, wp_len
;
881 num_brps
= hw_breakpoint_slots(TYPE_INST
);
882 num_wrps
= hw_breakpoint_slots(TYPE_DATA
);
884 debug_arch
= debug_monitors_arch();
898 static int compat_ptrace_hbp_get(unsigned int note_type
,
899 struct task_struct
*tsk
,
906 int err
, idx
= compat_ptrace_hbp_num_to_idx(num
);;
909 err
= ptrace_hbp_get_addr(note_type
, tsk
, idx
, &addr
);
912 err
= ptrace_hbp_get_ctrl(note_type
, tsk
, idx
, &ctrl
);
919 static int compat_ptrace_hbp_set(unsigned int note_type
,
920 struct task_struct
*tsk
,
927 int err
, idx
= compat_ptrace_hbp_num_to_idx(num
);
931 err
= ptrace_hbp_set_addr(note_type
, tsk
, idx
, addr
);
934 err
= ptrace_hbp_set_ctrl(note_type
, tsk
, idx
, ctrl
);
940 static int compat_ptrace_gethbpregs(struct task_struct
*tsk
, compat_long_t num
,
941 compat_ulong_t __user
*data
)
945 mm_segment_t old_fs
= get_fs();
950 ret
= compat_ptrace_hbp_get(NT_ARM_HW_WATCH
, tsk
, num
, &kdata
);
952 } else if (num
== 0) {
953 ret
= compat_ptrace_hbp_get_resource_info(&kdata
);
956 ret
= compat_ptrace_hbp_get(NT_ARM_HW_BREAK
, tsk
, num
, &kdata
);
961 ret
= put_user(kdata
, data
);
966 static int compat_ptrace_sethbpregs(struct task_struct
*tsk
, compat_long_t num
,
967 compat_ulong_t __user
*data
)
971 mm_segment_t old_fs
= get_fs();
976 ret
= get_user(kdata
, data
);
982 ret
= compat_ptrace_hbp_set(NT_ARM_HW_WATCH
, tsk
, num
, &kdata
);
984 ret
= compat_ptrace_hbp_set(NT_ARM_HW_BREAK
, tsk
, num
, &kdata
);
989 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
991 long compat_arch_ptrace(struct task_struct
*child
, compat_long_t request
,
992 compat_ulong_t caddr
, compat_ulong_t cdata
)
994 unsigned long addr
= caddr
;
995 unsigned long data
= cdata
;
996 void __user
*datap
= compat_ptr(data
);
1000 case PTRACE_PEEKUSR
:
1001 ret
= compat_ptrace_read_user(child
, addr
, datap
);
1004 case PTRACE_POKEUSR
:
1005 ret
= compat_ptrace_write_user(child
, addr
, data
);
1008 case COMPAT_PTRACE_GETREGS
:
1009 ret
= copy_regset_to_user(child
,
1012 0, sizeof(compat_elf_gregset_t
),
1016 case COMPAT_PTRACE_SETREGS
:
1017 ret
= copy_regset_from_user(child
,
1020 0, sizeof(compat_elf_gregset_t
),
1024 case COMPAT_PTRACE_GET_THREAD_AREA
:
1025 ret
= put_user((compat_ulong_t
)child
->thread
.tp_value
,
1026 (compat_ulong_t __user
*)datap
);
1029 case COMPAT_PTRACE_SET_SYSCALL
:
1030 task_pt_regs(child
)->syscallno
= data
;
1034 case COMPAT_PTRACE_GETVFPREGS
:
1035 ret
= copy_regset_to_user(child
,
1042 case COMPAT_PTRACE_SETVFPREGS
:
1043 ret
= copy_regset_from_user(child
,
1050 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1051 case COMPAT_PTRACE_GETHBPREGS
:
1052 ret
= compat_ptrace_gethbpregs(child
, addr
, datap
);
1055 case COMPAT_PTRACE_SETHBPREGS
:
1056 ret
= compat_ptrace_sethbpregs(child
, addr
, datap
);
1061 ret
= compat_ptrace_request(child
, request
, addr
,
1068 #endif /* CONFIG_COMPAT */
1070 const struct user_regset_view
*task_user_regset_view(struct task_struct
*task
)
1072 #ifdef CONFIG_COMPAT
1073 if (is_compat_thread(task_thread_info(task
)))
1074 return &user_aarch32_view
;
1076 return &user_aarch64_view
;
1079 long arch_ptrace(struct task_struct
*child
, long request
,
1080 unsigned long addr
, unsigned long data
)
1082 return ptrace_request(child
, request
, addr
, data
);
1086 static int __init
ptrace_break_init(void)
1088 hook_debug_fault_code(DBG_ESR_EVT_BRK
, arm64_break_trap
, SIGTRAP
,
1089 TRAP_BRKPT
, "ptrace BRK handler");
1092 core_initcall(ptrace_break_init
);
1095 asmlinkage
int syscall_trace(int dir
, struct pt_regs
*regs
)
1097 unsigned long saved_reg
;
1099 if (!test_thread_flag(TIF_SYSCALL_TRACE
))
1100 return regs
->syscallno
;
1102 if (is_compat_task()) {
1103 /* AArch32 uses ip (r12) for scratch */
1104 saved_reg
= regs
->regs
[12];
1105 regs
->regs
[12] = dir
;
1108 * Save X7. X7 is used to denote syscall entry/exit:
1109 * X7 = 0 -> entry, = 1 -> exit
1111 saved_reg
= regs
->regs
[7];
1112 regs
->regs
[7] = dir
;
1116 tracehook_report_syscall_exit(regs
, 0);
1117 else if (tracehook_report_syscall_entry(regs
))
1118 regs
->syscallno
= ~0UL;
1120 if (is_compat_task())
1121 regs
->regs
[12] = saved_reg
;
1123 regs
->regs
[7] = saved_reg
;
1125 return regs
->syscallno
;