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22#include <linux/audit.h>
23#include <linux/compat.h>
24#include <linux/kernel.h>
25#include <linux/sched/signal.h>
26#include <linux/sched/task_stack.h>
27#include <linux/mm.h>
28#include <linux/nospec.h>
29#include <linux/smp.h>
30#include <linux/ptrace.h>
31#include <linux/user.h>
32#include <linux/seccomp.h>
33#include <linux/security.h>
34#include <linux/init.h>
35#include <linux/signal.h>
36#include <linux/string.h>
37#include <linux/uaccess.h>
38#include <linux/perf_event.h>
39#include <linux/hw_breakpoint.h>
40#include <linux/regset.h>
41#include <linux/tracehook.h>
42#include <linux/elf.h>
43
44#include <asm/compat.h>
45#include <asm/cpufeature.h>
46#include <asm/debug-monitors.h>
47#include <asm/pgtable.h>
48#include <asm/stacktrace.h>
49#include <asm/syscall.h>
50#include <asm/traps.h>
51#include <asm/system_misc.h>
52
53#define CREATE_TRACE_POINTS
54#include <trace/events/syscalls.h>
55
56struct pt_regs_offset {
57 const char *name;
58 int offset;
59};
60
61#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
62#define REG_OFFSET_END {.name = NULL, .offset = 0}
63#define GPR_OFFSET_NAME(r) \
64 {.name = "x" #r, .offset = offsetof(struct pt_regs, regs[r])}
65
66static const struct pt_regs_offset regoffset_table[] = {
67 GPR_OFFSET_NAME(0),
68 GPR_OFFSET_NAME(1),
69 GPR_OFFSET_NAME(2),
70 GPR_OFFSET_NAME(3),
71 GPR_OFFSET_NAME(4),
72 GPR_OFFSET_NAME(5),
73 GPR_OFFSET_NAME(6),
74 GPR_OFFSET_NAME(7),
75 GPR_OFFSET_NAME(8),
76 GPR_OFFSET_NAME(9),
77 GPR_OFFSET_NAME(10),
78 GPR_OFFSET_NAME(11),
79 GPR_OFFSET_NAME(12),
80 GPR_OFFSET_NAME(13),
81 GPR_OFFSET_NAME(14),
82 GPR_OFFSET_NAME(15),
83 GPR_OFFSET_NAME(16),
84 GPR_OFFSET_NAME(17),
85 GPR_OFFSET_NAME(18),
86 GPR_OFFSET_NAME(19),
87 GPR_OFFSET_NAME(20),
88 GPR_OFFSET_NAME(21),
89 GPR_OFFSET_NAME(22),
90 GPR_OFFSET_NAME(23),
91 GPR_OFFSET_NAME(24),
92 GPR_OFFSET_NAME(25),
93 GPR_OFFSET_NAME(26),
94 GPR_OFFSET_NAME(27),
95 GPR_OFFSET_NAME(28),
96 GPR_OFFSET_NAME(29),
97 GPR_OFFSET_NAME(30),
98 {.name = "lr", .offset = offsetof(struct pt_regs, regs[30])},
99 REG_OFFSET_NAME(sp),
100 REG_OFFSET_NAME(pc),
101 REG_OFFSET_NAME(pstate),
102 REG_OFFSET_END,
103};
104
105
106
107
108
109
110
111
112int regs_query_register_offset(const char *name)
113{
114 const struct pt_regs_offset *roff;
115
116 for (roff = regoffset_table; roff->name != NULL; roff++)
117 if (!strcmp(roff->name, name))
118 return roff->offset;
119 return -EINVAL;
120}
121
122
123
124
125
126
127
128
129
130static bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
131{
132 return ((addr & ~(THREAD_SIZE - 1)) ==
133 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))) ||
134 on_irq_stack(addr);
135}
136
137
138
139
140
141
142
143
144
145
146unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
147{
148 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
149
150 addr += n;
151 if (regs_within_kernel_stack(regs, (unsigned long)addr))
152 return *addr;
153 else
154 return 0;
155}
156
157
158
159
160
161
162
163
164
165void ptrace_disable(struct task_struct *child)
166{
167
168
169
170
171
172 user_disable_single_step(child);
173}
174
175#ifdef CONFIG_HAVE_HW_BREAKPOINT
176
177
178
179static void ptrace_hbptriggered(struct perf_event *bp,
180 struct perf_sample_data *data,
181 struct pt_regs *regs)
182{
183 struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
184 siginfo_t info;
185
186 clear_siginfo(&info);
187 info.si_signo = SIGTRAP;
188 info.si_errno = 0;
189 info.si_code = TRAP_HWBKPT;
190 info.si_addr = (void __user *)(bkpt->trigger);
191
192#ifdef CONFIG_COMPAT
193 if (is_compat_task()) {
194 int si_errno = 0;
195 int i;
196
197 for (i = 0; i < ARM_MAX_BRP; ++i) {
198 if (current->thread.debug.hbp_break[i] == bp) {
199 si_errno = (i << 1) + 1;
200 break;
201 }
202 }
203
204 for (i = 0; i < ARM_MAX_WRP; ++i) {
205 if (current->thread.debug.hbp_watch[i] == bp) {
206 si_errno = -((i << 1) + 1);
207 break;
208 }
209 }
210 force_sig_ptrace_errno_trap(si_errno, (void __user *)bkpt->trigger);
211 }
212#endif
213 arm64_force_sig_info(&info, "Hardware breakpoint trap (ptrace)", current);
214}
215
216
217
218
219
220void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
221{
222 int i;
223 struct thread_struct *t = &tsk->thread;
224
225 for (i = 0; i < ARM_MAX_BRP; i++) {
226 if (t->debug.hbp_break[i]) {
227 unregister_hw_breakpoint(t->debug.hbp_break[i]);
228 t->debug.hbp_break[i] = NULL;
229 }
230 }
231
232 for (i = 0; i < ARM_MAX_WRP; i++) {
233 if (t->debug.hbp_watch[i]) {
234 unregister_hw_breakpoint(t->debug.hbp_watch[i]);
235 t->debug.hbp_watch[i] = NULL;
236 }
237 }
238}
239
240void ptrace_hw_copy_thread(struct task_struct *tsk)
241{
242 memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
243}
244
245static struct perf_event *ptrace_hbp_get_event(unsigned int note_type,
246 struct task_struct *tsk,
247 unsigned long idx)
248{
249 struct perf_event *bp = ERR_PTR(-EINVAL);
250
251 switch (note_type) {
252 case NT_ARM_HW_BREAK:
253 if (idx >= ARM_MAX_BRP)
254 goto out;
255 idx = array_index_nospec(idx, ARM_MAX_BRP);
256 bp = tsk->thread.debug.hbp_break[idx];
257 break;
258 case NT_ARM_HW_WATCH:
259 if (idx >= ARM_MAX_WRP)
260 goto out;
261 idx = array_index_nospec(idx, ARM_MAX_WRP);
262 bp = tsk->thread.debug.hbp_watch[idx];
263 break;
264 }
265
266out:
267 return bp;
268}
269
270static int ptrace_hbp_set_event(unsigned int note_type,
271 struct task_struct *tsk,
272 unsigned long idx,
273 struct perf_event *bp)
274{
275 int err = -EINVAL;
276
277 switch (note_type) {
278 case NT_ARM_HW_BREAK:
279 if (idx < ARM_MAX_BRP) {
280 tsk->thread.debug.hbp_break[idx] = bp;
281 err = 0;
282 }
283 break;
284 case NT_ARM_HW_WATCH:
285 if (idx < ARM_MAX_WRP) {
286 tsk->thread.debug.hbp_watch[idx] = bp;
287 err = 0;
288 }
289 break;
290 }
291
292 return err;
293}
294
295static struct perf_event *ptrace_hbp_create(unsigned int note_type,
296 struct task_struct *tsk,
297 unsigned long idx)
298{
299 struct perf_event *bp;
300 struct perf_event_attr attr;
301 int err, type;
302
303 switch (note_type) {
304 case NT_ARM_HW_BREAK:
305 type = HW_BREAKPOINT_X;
306 break;
307 case NT_ARM_HW_WATCH:
308 type = HW_BREAKPOINT_RW;
309 break;
310 default:
311 return ERR_PTR(-EINVAL);
312 }
313
314 ptrace_breakpoint_init(&attr);
315
316
317
318
319
320 attr.bp_addr = 0;
321 attr.bp_len = HW_BREAKPOINT_LEN_4;
322 attr.bp_type = type;
323 attr.disabled = 1;
324
325 bp = register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, tsk);
326 if (IS_ERR(bp))
327 return bp;
328
329 err = ptrace_hbp_set_event(note_type, tsk, idx, bp);
330 if (err)
331 return ERR_PTR(err);
332
333 return bp;
334}
335
336static int ptrace_hbp_fill_attr_ctrl(unsigned int note_type,
337 struct arch_hw_breakpoint_ctrl ctrl,
338 struct perf_event_attr *attr)
339{
340 int err, len, type, offset, disabled = !ctrl.enabled;
341
342 attr->disabled = disabled;
343 if (disabled)
344 return 0;
345
346 err = arch_bp_generic_fields(ctrl, &len, &type, &offset);
347 if (err)
348 return err;
349
350 switch (note_type) {
351 case NT_ARM_HW_BREAK:
352 if ((type & HW_BREAKPOINT_X) != type)
353 return -EINVAL;
354 break;
355 case NT_ARM_HW_WATCH:
356 if ((type & HW_BREAKPOINT_RW) != type)
357 return -EINVAL;
358 break;
359 default:
360 return -EINVAL;
361 }
362
363 attr->bp_len = len;
364 attr->bp_type = type;
365 attr->bp_addr += offset;
366
367 return 0;
368}
369
370static int ptrace_hbp_get_resource_info(unsigned int note_type, u32 *info)
371{
372 u8 num;
373 u32 reg = 0;
374
375 switch (note_type) {
376 case NT_ARM_HW_BREAK:
377 num = hw_breakpoint_slots(TYPE_INST);
378 break;
379 case NT_ARM_HW_WATCH:
380 num = hw_breakpoint_slots(TYPE_DATA);
381 break;
382 default:
383 return -EINVAL;
384 }
385
386 reg |= debug_monitors_arch();
387 reg <<= 8;
388 reg |= num;
389
390 *info = reg;
391 return 0;
392}
393
394static int ptrace_hbp_get_ctrl(unsigned int note_type,
395 struct task_struct *tsk,
396 unsigned long idx,
397 u32 *ctrl)
398{
399 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
400
401 if (IS_ERR(bp))
402 return PTR_ERR(bp);
403
404 *ctrl = bp ? encode_ctrl_reg(counter_arch_bp(bp)->ctrl) : 0;
405 return 0;
406}
407
408static int ptrace_hbp_get_addr(unsigned int note_type,
409 struct task_struct *tsk,
410 unsigned long idx,
411 u64 *addr)
412{
413 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
414
415 if (IS_ERR(bp))
416 return PTR_ERR(bp);
417
418 *addr = bp ? counter_arch_bp(bp)->address : 0;
419 return 0;
420}
421
422static struct perf_event *ptrace_hbp_get_initialised_bp(unsigned int note_type,
423 struct task_struct *tsk,
424 unsigned long idx)
425{
426 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
427
428 if (!bp)
429 bp = ptrace_hbp_create(note_type, tsk, idx);
430
431 return bp;
432}
433
434static int ptrace_hbp_set_ctrl(unsigned int note_type,
435 struct task_struct *tsk,
436 unsigned long idx,
437 u32 uctrl)
438{
439 int err;
440 struct perf_event *bp;
441 struct perf_event_attr attr;
442 struct arch_hw_breakpoint_ctrl ctrl;
443
444 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
445 if (IS_ERR(bp)) {
446 err = PTR_ERR(bp);
447 return err;
448 }
449
450 attr = bp->attr;
451 decode_ctrl_reg(uctrl, &ctrl);
452 err = ptrace_hbp_fill_attr_ctrl(note_type, ctrl, &attr);
453 if (err)
454 return err;
455
456 return modify_user_hw_breakpoint(bp, &attr);
457}
458
459static int ptrace_hbp_set_addr(unsigned int note_type,
460 struct task_struct *tsk,
461 unsigned long idx,
462 u64 addr)
463{
464 int err;
465 struct perf_event *bp;
466 struct perf_event_attr attr;
467
468 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
469 if (IS_ERR(bp)) {
470 err = PTR_ERR(bp);
471 return err;
472 }
473
474 attr = bp->attr;
475 attr.bp_addr = addr;
476 err = modify_user_hw_breakpoint(bp, &attr);
477 return err;
478}
479
480#define PTRACE_HBP_ADDR_SZ sizeof(u64)
481#define PTRACE_HBP_CTRL_SZ sizeof(u32)
482#define PTRACE_HBP_PAD_SZ sizeof(u32)
483
484static int hw_break_get(struct task_struct *target,
485 const struct user_regset *regset,
486 unsigned int pos, unsigned int count,
487 void *kbuf, void __user *ubuf)
488{
489 unsigned int note_type = regset->core_note_type;
490 int ret, idx = 0, offset, limit;
491 u32 info, ctrl;
492 u64 addr;
493
494
495 ret = ptrace_hbp_get_resource_info(note_type, &info);
496 if (ret)
497 return ret;
498
499 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0,
500 sizeof(info));
501 if (ret)
502 return ret;
503
504
505 offset = offsetof(struct user_hwdebug_state, pad);
506 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, offset,
507 offset + PTRACE_HBP_PAD_SZ);
508 if (ret)
509 return ret;
510
511
512 offset = offsetof(struct user_hwdebug_state, dbg_regs);
513 limit = regset->n * regset->size;
514 while (count && offset < limit) {
515 ret = ptrace_hbp_get_addr(note_type, target, idx, &addr);
516 if (ret)
517 return ret;
518 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &addr,
519 offset, offset + PTRACE_HBP_ADDR_SZ);
520 if (ret)
521 return ret;
522 offset += PTRACE_HBP_ADDR_SZ;
523
524 ret = ptrace_hbp_get_ctrl(note_type, target, idx, &ctrl);
525 if (ret)
526 return ret;
527 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &ctrl,
528 offset, offset + PTRACE_HBP_CTRL_SZ);
529 if (ret)
530 return ret;
531 offset += PTRACE_HBP_CTRL_SZ;
532
533 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
534 offset,
535 offset + PTRACE_HBP_PAD_SZ);
536 if (ret)
537 return ret;
538 offset += PTRACE_HBP_PAD_SZ;
539 idx++;
540 }
541
542 return 0;
543}
544
545static int hw_break_set(struct task_struct *target,
546 const struct user_regset *regset,
547 unsigned int pos, unsigned int count,
548 const void *kbuf, const void __user *ubuf)
549{
550 unsigned int note_type = regset->core_note_type;
551 int ret, idx = 0, offset, limit;
552 u32 ctrl;
553 u64 addr;
554
555
556 offset = offsetof(struct user_hwdebug_state, dbg_regs);
557 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
558 if (ret)
559 return ret;
560
561
562 limit = regset->n * regset->size;
563 while (count && offset < limit) {
564 if (count < PTRACE_HBP_ADDR_SZ)
565 return -EINVAL;
566 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
567 offset, offset + PTRACE_HBP_ADDR_SZ);
568 if (ret)
569 return ret;
570 ret = ptrace_hbp_set_addr(note_type, target, idx, addr);
571 if (ret)
572 return ret;
573 offset += PTRACE_HBP_ADDR_SZ;
574
575 if (!count)
576 break;
577 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
578 offset, offset + PTRACE_HBP_CTRL_SZ);
579 if (ret)
580 return ret;
581 ret = ptrace_hbp_set_ctrl(note_type, target, idx, ctrl);
582 if (ret)
583 return ret;
584 offset += PTRACE_HBP_CTRL_SZ;
585
586 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
587 offset,
588 offset + PTRACE_HBP_PAD_SZ);
589 if (ret)
590 return ret;
591 offset += PTRACE_HBP_PAD_SZ;
592 idx++;
593 }
594
595 return 0;
596}
597#endif
598
599static int gpr_get(struct task_struct *target,
600 const struct user_regset *regset,
601 unsigned int pos, unsigned int count,
602 void *kbuf, void __user *ubuf)
603{
604 struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
605 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
606}
607
608static int gpr_set(struct task_struct *target, const struct user_regset *regset,
609 unsigned int pos, unsigned int count,
610 const void *kbuf, const void __user *ubuf)
611{
612 int ret;
613 struct user_pt_regs newregs = task_pt_regs(target)->user_regs;
614
615 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
616 if (ret)
617 return ret;
618
619 if (!valid_user_regs(&newregs, target))
620 return -EINVAL;
621
622 task_pt_regs(target)->user_regs = newregs;
623 return 0;
624}
625
626
627
628
629static int __fpr_get(struct task_struct *target,
630 const struct user_regset *regset,
631 unsigned int pos, unsigned int count,
632 void *kbuf, void __user *ubuf, unsigned int start_pos)
633{
634 struct user_fpsimd_state *uregs;
635
636 sve_sync_to_fpsimd(target);
637
638 uregs = &target->thread.uw.fpsimd_state;
639
640 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs,
641 start_pos, start_pos + sizeof(*uregs));
642}
643
644static int fpr_get(struct task_struct *target, const struct user_regset *regset,
645 unsigned int pos, unsigned int count,
646 void *kbuf, void __user *ubuf)
647{
648 if (target == current)
649 fpsimd_preserve_current_state();
650
651 return __fpr_get(target, regset, pos, count, kbuf, ubuf, 0);
652}
653
654static int __fpr_set(struct task_struct *target,
655 const struct user_regset *regset,
656 unsigned int pos, unsigned int count,
657 const void *kbuf, const void __user *ubuf,
658 unsigned int start_pos)
659{
660 int ret;
661 struct user_fpsimd_state newstate;
662
663
664
665
666
667 sve_sync_to_fpsimd(target);
668
669 newstate = target->thread.uw.fpsimd_state;
670
671 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate,
672 start_pos, start_pos + sizeof(newstate));
673 if (ret)
674 return ret;
675
676 target->thread.uw.fpsimd_state = newstate;
677
678 return ret;
679}
680
681static int fpr_set(struct task_struct *target, const struct user_regset *regset,
682 unsigned int pos, unsigned int count,
683 const void *kbuf, const void __user *ubuf)
684{
685 int ret;
686
687 ret = __fpr_set(target, regset, pos, count, kbuf, ubuf, 0);
688 if (ret)
689 return ret;
690
691 sve_sync_from_fpsimd_zeropad(target);
692 fpsimd_flush_task_state(target);
693
694 return ret;
695}
696
697static int tls_get(struct task_struct *target, const struct user_regset *regset,
698 unsigned int pos, unsigned int count,
699 void *kbuf, void __user *ubuf)
700{
701 unsigned long *tls = &target->thread.uw.tp_value;
702
703 if (target == current)
704 tls_preserve_current_state();
705
706 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, tls, 0, -1);
707}
708
709static int tls_set(struct task_struct *target, const struct user_regset *regset,
710 unsigned int pos, unsigned int count,
711 const void *kbuf, const void __user *ubuf)
712{
713 int ret;
714 unsigned long tls = target->thread.uw.tp_value;
715
716 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
717 if (ret)
718 return ret;
719
720 target->thread.uw.tp_value = tls;
721 return ret;
722}
723
724static int system_call_get(struct task_struct *target,
725 const struct user_regset *regset,
726 unsigned int pos, unsigned int count,
727 void *kbuf, void __user *ubuf)
728{
729 int syscallno = task_pt_regs(target)->syscallno;
730
731 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
732 &syscallno, 0, -1);
733}
734
735static int system_call_set(struct task_struct *target,
736 const struct user_regset *regset,
737 unsigned int pos, unsigned int count,
738 const void *kbuf, const void __user *ubuf)
739{
740 int syscallno = task_pt_regs(target)->syscallno;
741 int ret;
742
743 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &syscallno, 0, -1);
744 if (ret)
745 return ret;
746
747 task_pt_regs(target)->syscallno = syscallno;
748 return ret;
749}
750
751#ifdef CONFIG_ARM64_SVE
752
753static void sve_init_header_from_task(struct user_sve_header *header,
754 struct task_struct *target)
755{
756 unsigned int vq;
757
758 memset(header, 0, sizeof(*header));
759
760 header->flags = test_tsk_thread_flag(target, TIF_SVE) ?
761 SVE_PT_REGS_SVE : SVE_PT_REGS_FPSIMD;
762 if (test_tsk_thread_flag(target, TIF_SVE_VL_INHERIT))
763 header->flags |= SVE_PT_VL_INHERIT;
764
765 header->vl = target->thread.sve_vl;
766 vq = sve_vq_from_vl(header->vl);
767
768 header->max_vl = sve_max_vl;
769 if (WARN_ON(!sve_vl_valid(sve_max_vl)))
770 header->max_vl = header->vl;
771
772 header->size = SVE_PT_SIZE(vq, header->flags);
773 header->max_size = SVE_PT_SIZE(sve_vq_from_vl(header->max_vl),
774 SVE_PT_REGS_SVE);
775}
776
777static unsigned int sve_size_from_header(struct user_sve_header const *header)
778{
779 return ALIGN(header->size, SVE_VQ_BYTES);
780}
781
782static unsigned int sve_get_size(struct task_struct *target,
783 const struct user_regset *regset)
784{
785 struct user_sve_header header;
786
787 if (!system_supports_sve())
788 return 0;
789
790 sve_init_header_from_task(&header, target);
791 return sve_size_from_header(&header);
792}
793
794static int sve_get(struct task_struct *target,
795 const struct user_regset *regset,
796 unsigned int pos, unsigned int count,
797 void *kbuf, void __user *ubuf)
798{
799 int ret;
800 struct user_sve_header header;
801 unsigned int vq;
802 unsigned long start, end;
803
804 if (!system_supports_sve())
805 return -EINVAL;
806
807
808 sve_init_header_from_task(&header, target);
809 vq = sve_vq_from_vl(header.vl);
810
811 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &header,
812 0, sizeof(header));
813 if (ret)
814 return ret;
815
816 if (target == current)
817 fpsimd_preserve_current_state();
818
819
820
821 BUILD_BUG_ON(SVE_PT_FPSIMD_OFFSET != sizeof(header));
822 if ((header.flags & SVE_PT_REGS_MASK) == SVE_PT_REGS_FPSIMD)
823 return __fpr_get(target, regset, pos, count, kbuf, ubuf,
824 SVE_PT_FPSIMD_OFFSET);
825
826
827
828 BUILD_BUG_ON(SVE_PT_SVE_OFFSET != sizeof(header));
829 start = SVE_PT_SVE_OFFSET;
830 end = SVE_PT_SVE_FFR_OFFSET(vq) + SVE_PT_SVE_FFR_SIZE(vq);
831 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
832 target->thread.sve_state,
833 start, end);
834 if (ret)
835 return ret;
836
837 start = end;
838 end = SVE_PT_SVE_FPSR_OFFSET(vq);
839 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
840 start, end);
841 if (ret)
842 return ret;
843
844
845
846
847
848 start = end;
849 end = SVE_PT_SVE_FPCR_OFFSET(vq) + SVE_PT_SVE_FPCR_SIZE;
850 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
851 &target->thread.uw.fpsimd_state.fpsr,
852 start, end);
853 if (ret)
854 return ret;
855
856 start = end;
857 end = sve_size_from_header(&header);
858 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
859 start, end);
860}
861
862static int sve_set(struct task_struct *target,
863 const struct user_regset *regset,
864 unsigned int pos, unsigned int count,
865 const void *kbuf, const void __user *ubuf)
866{
867 int ret;
868 struct user_sve_header header;
869 unsigned int vq;
870 unsigned long start, end;
871
872 if (!system_supports_sve())
873 return -EINVAL;
874
875
876 if (count < sizeof(header))
877 return -EINVAL;
878 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &header,
879 0, sizeof(header));
880 if (ret)
881 goto out;
882
883
884
885
886
887 ret = sve_set_vector_length(target, header.vl,
888 ((unsigned long)header.flags & ~SVE_PT_REGS_MASK) << 16);
889 if (ret)
890 goto out;
891
892
893 vq = sve_vq_from_vl(target->thread.sve_vl);
894
895
896
897 BUILD_BUG_ON(SVE_PT_FPSIMD_OFFSET != sizeof(header));
898 if ((header.flags & SVE_PT_REGS_MASK) == SVE_PT_REGS_FPSIMD) {
899 ret = __fpr_set(target, regset, pos, count, kbuf, ubuf,
900 SVE_PT_FPSIMD_OFFSET);
901 clear_tsk_thread_flag(target, TIF_SVE);
902 goto out;
903 }
904
905
906
907
908
909
910
911
912 if (count && vq != sve_vq_from_vl(header.vl)) {
913 ret = -EIO;
914 goto out;
915 }
916
917 sve_alloc(target);
918
919
920
921
922
923
924 fpsimd_sync_to_sve(target);
925 set_tsk_thread_flag(target, TIF_SVE);
926
927 BUILD_BUG_ON(SVE_PT_SVE_OFFSET != sizeof(header));
928 start = SVE_PT_SVE_OFFSET;
929 end = SVE_PT_SVE_FFR_OFFSET(vq) + SVE_PT_SVE_FFR_SIZE(vq);
930 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
931 target->thread.sve_state,
932 start, end);
933 if (ret)
934 goto out;
935
936 start = end;
937 end = SVE_PT_SVE_FPSR_OFFSET(vq);
938 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
939 start, end);
940 if (ret)
941 goto out;
942
943
944
945
946
947 start = end;
948 end = SVE_PT_SVE_FPCR_OFFSET(vq) + SVE_PT_SVE_FPCR_SIZE;
949 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
950 &target->thread.uw.fpsimd_state.fpsr,
951 start, end);
952
953out:
954 fpsimd_flush_task_state(target);
955 return ret;
956}
957
958#endif
959
960enum aarch64_regset {
961 REGSET_GPR,
962 REGSET_FPR,
963 REGSET_TLS,
964#ifdef CONFIG_HAVE_HW_BREAKPOINT
965 REGSET_HW_BREAK,
966 REGSET_HW_WATCH,
967#endif
968 REGSET_SYSTEM_CALL,
969#ifdef CONFIG_ARM64_SVE
970 REGSET_SVE,
971#endif
972};
973
974static const struct user_regset aarch64_regsets[] = {
975 [REGSET_GPR] = {
976 .core_note_type = NT_PRSTATUS,
977 .n = sizeof(struct user_pt_regs) / sizeof(u64),
978 .size = sizeof(u64),
979 .align = sizeof(u64),
980 .get = gpr_get,
981 .set = gpr_set
982 },
983 [REGSET_FPR] = {
984 .core_note_type = NT_PRFPREG,
985 .n = sizeof(struct user_fpsimd_state) / sizeof(u32),
986
987
988
989
990 .size = sizeof(u32),
991 .align = sizeof(u32),
992 .get = fpr_get,
993 .set = fpr_set
994 },
995 [REGSET_TLS] = {
996 .core_note_type = NT_ARM_TLS,
997 .n = 1,
998 .size = sizeof(void *),
999 .align = sizeof(void *),
1000 .get = tls_get,
1001 .set = tls_set,
1002 },
1003#ifdef CONFIG_HAVE_HW_BREAKPOINT
1004 [REGSET_HW_BREAK] = {
1005 .core_note_type = NT_ARM_HW_BREAK,
1006 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
1007 .size = sizeof(u32),
1008 .align = sizeof(u32),
1009 .get = hw_break_get,
1010 .set = hw_break_set,
1011 },
1012 [REGSET_HW_WATCH] = {
1013 .core_note_type = NT_ARM_HW_WATCH,
1014 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
1015 .size = sizeof(u32),
1016 .align = sizeof(u32),
1017 .get = hw_break_get,
1018 .set = hw_break_set,
1019 },
1020#endif
1021 [REGSET_SYSTEM_CALL] = {
1022 .core_note_type = NT_ARM_SYSTEM_CALL,
1023 .n = 1,
1024 .size = sizeof(int),
1025 .align = sizeof(int),
1026 .get = system_call_get,
1027 .set = system_call_set,
1028 },
1029#ifdef CONFIG_ARM64_SVE
1030 [REGSET_SVE] = {
1031 .core_note_type = NT_ARM_SVE,
1032 .n = DIV_ROUND_UP(SVE_PT_SIZE(SVE_VQ_MAX, SVE_PT_REGS_SVE),
1033 SVE_VQ_BYTES),
1034 .size = SVE_VQ_BYTES,
1035 .align = SVE_VQ_BYTES,
1036 .get = sve_get,
1037 .set = sve_set,
1038 .get_size = sve_get_size,
1039 },
1040#endif
1041};
1042
1043static const struct user_regset_view user_aarch64_view = {
1044 .name = "aarch64", .e_machine = EM_AARCH64,
1045 .regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets)
1046};
1047
1048#ifdef CONFIG_COMPAT
1049#include <linux/compat.h>
1050
1051enum compat_regset {
1052 REGSET_COMPAT_GPR,
1053 REGSET_COMPAT_VFP,
1054};
1055
1056static int compat_gpr_get(struct task_struct *target,
1057 const struct user_regset *regset,
1058 unsigned int pos, unsigned int count,
1059 void *kbuf, void __user *ubuf)
1060{
1061 int ret = 0;
1062 unsigned int i, start, num_regs;
1063
1064
1065 num_regs = count / regset->size;
1066
1067
1068 start = pos / regset->size;
1069
1070 if (start + num_regs > regset->n)
1071 return -EIO;
1072
1073 for (i = 0; i < num_regs; ++i) {
1074 unsigned int idx = start + i;
1075 compat_ulong_t reg;
1076
1077 switch (idx) {
1078 case 15:
1079 reg = task_pt_regs(target)->pc;
1080 break;
1081 case 16:
1082 reg = task_pt_regs(target)->pstate;
1083 break;
1084 case 17:
1085 reg = task_pt_regs(target)->orig_x0;
1086 break;
1087 default:
1088 reg = task_pt_regs(target)->regs[idx];
1089 }
1090
1091 if (kbuf) {
1092 memcpy(kbuf, ®, sizeof(reg));
1093 kbuf += sizeof(reg);
1094 } else {
1095 ret = copy_to_user(ubuf, ®, sizeof(reg));
1096 if (ret) {
1097 ret = -EFAULT;
1098 break;
1099 }
1100
1101 ubuf += sizeof(reg);
1102 }
1103 }
1104
1105 return ret;
1106}
1107
1108static int compat_gpr_set(struct task_struct *target,
1109 const struct user_regset *regset,
1110 unsigned int pos, unsigned int count,
1111 const void *kbuf, const void __user *ubuf)
1112{
1113 struct pt_regs newregs;
1114 int ret = 0;
1115 unsigned int i, start, num_regs;
1116
1117
1118 num_regs = count / regset->size;
1119
1120
1121 start = pos / regset->size;
1122
1123 if (start + num_regs > regset->n)
1124 return -EIO;
1125
1126 newregs = *task_pt_regs(target);
1127
1128 for (i = 0; i < num_regs; ++i) {
1129 unsigned int idx = start + i;
1130 compat_ulong_t reg;
1131
1132 if (kbuf) {
1133 memcpy(®, kbuf, sizeof(reg));
1134 kbuf += sizeof(reg);
1135 } else {
1136 ret = copy_from_user(®, ubuf, sizeof(reg));
1137 if (ret) {
1138 ret = -EFAULT;
1139 break;
1140 }
1141
1142 ubuf += sizeof(reg);
1143 }
1144
1145 switch (idx) {
1146 case 15:
1147 newregs.pc = reg;
1148 break;
1149 case 16:
1150 newregs.pstate = reg;
1151 break;
1152 case 17:
1153 newregs.orig_x0 = reg;
1154 break;
1155 default:
1156 newregs.regs[idx] = reg;
1157 }
1158
1159 }
1160
1161 if (valid_user_regs(&newregs.user_regs, target))
1162 *task_pt_regs(target) = newregs;
1163 else
1164 ret = -EINVAL;
1165
1166 return ret;
1167}
1168
1169static int compat_vfp_get(struct task_struct *target,
1170 const struct user_regset *regset,
1171 unsigned int pos, unsigned int count,
1172 void *kbuf, void __user *ubuf)
1173{
1174 struct user_fpsimd_state *uregs;
1175 compat_ulong_t fpscr;
1176 int ret, vregs_end_pos;
1177
1178 uregs = &target->thread.uw.fpsimd_state;
1179
1180 if (target == current)
1181 fpsimd_preserve_current_state();
1182
1183
1184
1185
1186
1187 vregs_end_pos = VFP_STATE_SIZE - sizeof(compat_ulong_t);
1188 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs,
1189 0, vregs_end_pos);
1190
1191 if (count && !ret) {
1192 fpscr = (uregs->fpsr & VFP_FPSCR_STAT_MASK) |
1193 (uregs->fpcr & VFP_FPSCR_CTRL_MASK);
1194
1195 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &fpscr,
1196 vregs_end_pos, VFP_STATE_SIZE);
1197 }
1198
1199 return ret;
1200}
1201
1202static int compat_vfp_set(struct task_struct *target,
1203 const struct user_regset *regset,
1204 unsigned int pos, unsigned int count,
1205 const void *kbuf, const void __user *ubuf)
1206{
1207 struct user_fpsimd_state *uregs;
1208 compat_ulong_t fpscr;
1209 int ret, vregs_end_pos;
1210
1211 uregs = &target->thread.uw.fpsimd_state;
1212
1213 vregs_end_pos = VFP_STATE_SIZE - sizeof(compat_ulong_t);
1214 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
1215 vregs_end_pos);
1216
1217 if (count && !ret) {
1218 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpscr,
1219 vregs_end_pos, VFP_STATE_SIZE);
1220 if (!ret) {
1221 uregs->fpsr = fpscr & VFP_FPSCR_STAT_MASK;
1222 uregs->fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
1223 }
1224 }
1225
1226 fpsimd_flush_task_state(target);
1227 return ret;
1228}
1229
1230static int compat_tls_get(struct task_struct *target,
1231 const struct user_regset *regset, unsigned int pos,
1232 unsigned int count, void *kbuf, void __user *ubuf)
1233{
1234 compat_ulong_t tls = (compat_ulong_t)target->thread.uw.tp_value;
1235 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
1236}
1237
1238static int compat_tls_set(struct task_struct *target,
1239 const struct user_regset *regset, unsigned int pos,
1240 unsigned int count, const void *kbuf,
1241 const void __user *ubuf)
1242{
1243 int ret;
1244 compat_ulong_t tls = target->thread.uw.tp_value;
1245
1246 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
1247 if (ret)
1248 return ret;
1249
1250 target->thread.uw.tp_value = tls;
1251 return ret;
1252}
1253
1254static const struct user_regset aarch32_regsets[] = {
1255 [REGSET_COMPAT_GPR] = {
1256 .core_note_type = NT_PRSTATUS,
1257 .n = COMPAT_ELF_NGREG,
1258 .size = sizeof(compat_elf_greg_t),
1259 .align = sizeof(compat_elf_greg_t),
1260 .get = compat_gpr_get,
1261 .set = compat_gpr_set
1262 },
1263 [REGSET_COMPAT_VFP] = {
1264 .core_note_type = NT_ARM_VFP,
1265 .n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
1266 .size = sizeof(compat_ulong_t),
1267 .align = sizeof(compat_ulong_t),
1268 .get = compat_vfp_get,
1269 .set = compat_vfp_set
1270 },
1271};
1272
1273static const struct user_regset_view user_aarch32_view = {
1274 .name = "aarch32", .e_machine = EM_ARM,
1275 .regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets)
1276};
1277
1278static const struct user_regset aarch32_ptrace_regsets[] = {
1279 [REGSET_GPR] = {
1280 .core_note_type = NT_PRSTATUS,
1281 .n = COMPAT_ELF_NGREG,
1282 .size = sizeof(compat_elf_greg_t),
1283 .align = sizeof(compat_elf_greg_t),
1284 .get = compat_gpr_get,
1285 .set = compat_gpr_set
1286 },
1287 [REGSET_FPR] = {
1288 .core_note_type = NT_ARM_VFP,
1289 .n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
1290 .size = sizeof(compat_ulong_t),
1291 .align = sizeof(compat_ulong_t),
1292 .get = compat_vfp_get,
1293 .set = compat_vfp_set
1294 },
1295 [REGSET_TLS] = {
1296 .core_note_type = NT_ARM_TLS,
1297 .n = 1,
1298 .size = sizeof(compat_ulong_t),
1299 .align = sizeof(compat_ulong_t),
1300 .get = compat_tls_get,
1301 .set = compat_tls_set,
1302 },
1303#ifdef CONFIG_HAVE_HW_BREAKPOINT
1304 [REGSET_HW_BREAK] = {
1305 .core_note_type = NT_ARM_HW_BREAK,
1306 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
1307 .size = sizeof(u32),
1308 .align = sizeof(u32),
1309 .get = hw_break_get,
1310 .set = hw_break_set,
1311 },
1312 [REGSET_HW_WATCH] = {
1313 .core_note_type = NT_ARM_HW_WATCH,
1314 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
1315 .size = sizeof(u32),
1316 .align = sizeof(u32),
1317 .get = hw_break_get,
1318 .set = hw_break_set,
1319 },
1320#endif
1321 [REGSET_SYSTEM_CALL] = {
1322 .core_note_type = NT_ARM_SYSTEM_CALL,
1323 .n = 1,
1324 .size = sizeof(int),
1325 .align = sizeof(int),
1326 .get = system_call_get,
1327 .set = system_call_set,
1328 },
1329};
1330
1331static const struct user_regset_view user_aarch32_ptrace_view = {
1332 .name = "aarch32", .e_machine = EM_ARM,
1333 .regsets = aarch32_ptrace_regsets, .n = ARRAY_SIZE(aarch32_ptrace_regsets)
1334};
1335
1336static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
1337 compat_ulong_t __user *ret)
1338{
1339 compat_ulong_t tmp;
1340
1341 if (off & 3)
1342 return -EIO;
1343
1344 if (off == COMPAT_PT_TEXT_ADDR)
1345 tmp = tsk->mm->start_code;
1346 else if (off == COMPAT_PT_DATA_ADDR)
1347 tmp = tsk->mm->start_data;
1348 else if (off == COMPAT_PT_TEXT_END_ADDR)
1349 tmp = tsk->mm->end_code;
1350 else if (off < sizeof(compat_elf_gregset_t))
1351 return copy_regset_to_user(tsk, &user_aarch32_view,
1352 REGSET_COMPAT_GPR, off,
1353 sizeof(compat_ulong_t), ret);
1354 else if (off >= COMPAT_USER_SZ)
1355 return -EIO;
1356 else
1357 tmp = 0;
1358
1359 return put_user(tmp, ret);
1360}
1361
1362static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off,
1363 compat_ulong_t val)
1364{
1365 int ret;
1366 mm_segment_t old_fs = get_fs();
1367
1368 if (off & 3 || off >= COMPAT_USER_SZ)
1369 return -EIO;
1370
1371 if (off >= sizeof(compat_elf_gregset_t))
1372 return 0;
1373
1374 set_fs(KERNEL_DS);
1375 ret = copy_regset_from_user(tsk, &user_aarch32_view,
1376 REGSET_COMPAT_GPR, off,
1377 sizeof(compat_ulong_t),
1378 &val);
1379 set_fs(old_fs);
1380
1381 return ret;
1382}
1383
1384#ifdef CONFIG_HAVE_HW_BREAKPOINT
1385
1386
1387
1388
1389
1390
1391
1392
1393static int compat_ptrace_hbp_num_to_idx(compat_long_t num)
1394{
1395 return (abs(num) - 1) >> 1;
1396}
1397
1398static int compat_ptrace_hbp_get_resource_info(u32 *kdata)
1399{
1400 u8 num_brps, num_wrps, debug_arch, wp_len;
1401 u32 reg = 0;
1402
1403 num_brps = hw_breakpoint_slots(TYPE_INST);
1404 num_wrps = hw_breakpoint_slots(TYPE_DATA);
1405
1406 debug_arch = debug_monitors_arch();
1407 wp_len = 8;
1408 reg |= debug_arch;
1409 reg <<= 8;
1410 reg |= wp_len;
1411 reg <<= 8;
1412 reg |= num_wrps;
1413 reg <<= 8;
1414 reg |= num_brps;
1415
1416 *kdata = reg;
1417 return 0;
1418}
1419
1420static int compat_ptrace_hbp_get(unsigned int note_type,
1421 struct task_struct *tsk,
1422 compat_long_t num,
1423 u32 *kdata)
1424{
1425 u64 addr = 0;
1426 u32 ctrl = 0;
1427
1428 int err, idx = compat_ptrace_hbp_num_to_idx(num);
1429
1430 if (num & 1) {
1431 err = ptrace_hbp_get_addr(note_type, tsk, idx, &addr);
1432 *kdata = (u32)addr;
1433 } else {
1434 err = ptrace_hbp_get_ctrl(note_type, tsk, idx, &ctrl);
1435 *kdata = ctrl;
1436 }
1437
1438 return err;
1439}
1440
1441static int compat_ptrace_hbp_set(unsigned int note_type,
1442 struct task_struct *tsk,
1443 compat_long_t num,
1444 u32 *kdata)
1445{
1446 u64 addr;
1447 u32 ctrl;
1448
1449 int err, idx = compat_ptrace_hbp_num_to_idx(num);
1450
1451 if (num & 1) {
1452 addr = *kdata;
1453 err = ptrace_hbp_set_addr(note_type, tsk, idx, addr);
1454 } else {
1455 ctrl = *kdata;
1456 err = ptrace_hbp_set_ctrl(note_type, tsk, idx, ctrl);
1457 }
1458
1459 return err;
1460}
1461
1462static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
1463 compat_ulong_t __user *data)
1464{
1465 int ret;
1466 u32 kdata;
1467
1468
1469 if (num < 0) {
1470 ret = compat_ptrace_hbp_get(NT_ARM_HW_WATCH, tsk, num, &kdata);
1471
1472 } else if (num == 0) {
1473 ret = compat_ptrace_hbp_get_resource_info(&kdata);
1474
1475 } else {
1476 ret = compat_ptrace_hbp_get(NT_ARM_HW_BREAK, tsk, num, &kdata);
1477 }
1478
1479 if (!ret)
1480 ret = put_user(kdata, data);
1481
1482 return ret;
1483}
1484
1485static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
1486 compat_ulong_t __user *data)
1487{
1488 int ret;
1489 u32 kdata = 0;
1490
1491 if (num == 0)
1492 return 0;
1493
1494 ret = get_user(kdata, data);
1495 if (ret)
1496 return ret;
1497
1498 if (num < 0)
1499 ret = compat_ptrace_hbp_set(NT_ARM_HW_WATCH, tsk, num, &kdata);
1500 else
1501 ret = compat_ptrace_hbp_set(NT_ARM_HW_BREAK, tsk, num, &kdata);
1502
1503 return ret;
1504}
1505#endif
1506
1507long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1508 compat_ulong_t caddr, compat_ulong_t cdata)
1509{
1510 unsigned long addr = caddr;
1511 unsigned long data = cdata;
1512 void __user *datap = compat_ptr(data);
1513 int ret;
1514
1515 switch (request) {
1516 case PTRACE_PEEKUSR:
1517 ret = compat_ptrace_read_user(child, addr, datap);
1518 break;
1519
1520 case PTRACE_POKEUSR:
1521 ret = compat_ptrace_write_user(child, addr, data);
1522 break;
1523
1524 case COMPAT_PTRACE_GETREGS:
1525 ret = copy_regset_to_user(child,
1526 &user_aarch32_view,
1527 REGSET_COMPAT_GPR,
1528 0, sizeof(compat_elf_gregset_t),
1529 datap);
1530 break;
1531
1532 case COMPAT_PTRACE_SETREGS:
1533 ret = copy_regset_from_user(child,
1534 &user_aarch32_view,
1535 REGSET_COMPAT_GPR,
1536 0, sizeof(compat_elf_gregset_t),
1537 datap);
1538 break;
1539
1540 case COMPAT_PTRACE_GET_THREAD_AREA:
1541 ret = put_user((compat_ulong_t)child->thread.uw.tp_value,
1542 (compat_ulong_t __user *)datap);
1543 break;
1544
1545 case COMPAT_PTRACE_SET_SYSCALL:
1546 task_pt_regs(child)->syscallno = data;
1547 ret = 0;
1548 break;
1549
1550 case COMPAT_PTRACE_GETVFPREGS:
1551 ret = copy_regset_to_user(child,
1552 &user_aarch32_view,
1553 REGSET_COMPAT_VFP,
1554 0, VFP_STATE_SIZE,
1555 datap);
1556 break;
1557
1558 case COMPAT_PTRACE_SETVFPREGS:
1559 ret = copy_regset_from_user(child,
1560 &user_aarch32_view,
1561 REGSET_COMPAT_VFP,
1562 0, VFP_STATE_SIZE,
1563 datap);
1564 break;
1565
1566#ifdef CONFIG_HAVE_HW_BREAKPOINT
1567 case COMPAT_PTRACE_GETHBPREGS:
1568 ret = compat_ptrace_gethbpregs(child, addr, datap);
1569 break;
1570
1571 case COMPAT_PTRACE_SETHBPREGS:
1572 ret = compat_ptrace_sethbpregs(child, addr, datap);
1573 break;
1574#endif
1575
1576 default:
1577 ret = compat_ptrace_request(child, request, addr,
1578 data);
1579 break;
1580 }
1581
1582 return ret;
1583}
1584#endif
1585
1586const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1587{
1588#ifdef CONFIG_COMPAT
1589
1590
1591
1592
1593
1594
1595 if (is_compat_task())
1596 return &user_aarch32_view;
1597 else if (is_compat_thread(task_thread_info(task)))
1598 return &user_aarch32_ptrace_view;
1599#endif
1600 return &user_aarch64_view;
1601}
1602
1603long arch_ptrace(struct task_struct *child, long request,
1604 unsigned long addr, unsigned long data)
1605{
1606 return ptrace_request(child, request, addr, data);
1607}
1608
1609enum ptrace_syscall_dir {
1610 PTRACE_SYSCALL_ENTER = 0,
1611 PTRACE_SYSCALL_EXIT,
1612};
1613
1614static void tracehook_report_syscall(struct pt_regs *regs,
1615 enum ptrace_syscall_dir dir)
1616{
1617 int regno;
1618 unsigned long saved_reg;
1619
1620
1621
1622
1623
1624 regno = (is_compat_task() ? 12 : 7);
1625 saved_reg = regs->regs[regno];
1626 regs->regs[regno] = dir;
1627
1628 if (dir == PTRACE_SYSCALL_EXIT)
1629 tracehook_report_syscall_exit(regs, 0);
1630 else if (tracehook_report_syscall_entry(regs))
1631 forget_syscall(regs);
1632
1633 regs->regs[regno] = saved_reg;
1634}
1635
1636asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1637{
1638 if (test_thread_flag(TIF_SYSCALL_TRACE))
1639 tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
1640
1641
1642 if (secure_computing(NULL) == -1)
1643 return -1;
1644
1645 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
1646 trace_sys_enter(regs, regs->syscallno);
1647
1648 audit_syscall_entry(regs->syscallno, regs->orig_x0, regs->regs[1],
1649 regs->regs[2], regs->regs[3]);
1650
1651 return regs->syscallno;
1652}
1653
1654asmlinkage void syscall_trace_exit(struct pt_regs *regs)
1655{
1656 audit_syscall_exit(regs);
1657
1658 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
1659 trace_sys_exit(regs, regs_return_value(regs));
1660
1661 if (test_thread_flag(TIF_SYSCALL_TRACE))
1662 tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);
1663}
1664
1665
1666
1667
1668
1669
1670#define SPSR_EL1_AARCH64_RES0_BITS \
1671 (GENMASK_ULL(63,32) | GENMASK_ULL(27, 22) | GENMASK_ULL(20, 10) | \
1672 GENMASK_ULL(5, 5))
1673#define SPSR_EL1_AARCH32_RES0_BITS \
1674 (GENMASK_ULL(63,32) | GENMASK_ULL(24, 22) | GENMASK_ULL(20,20))
1675
1676static int valid_compat_regs(struct user_pt_regs *regs)
1677{
1678 regs->pstate &= ~SPSR_EL1_AARCH32_RES0_BITS;
1679
1680 if (!system_supports_mixed_endian_el0()) {
1681 if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
1682 regs->pstate |= COMPAT_PSR_E_BIT;
1683 else
1684 regs->pstate &= ~COMPAT_PSR_E_BIT;
1685 }
1686
1687 if (user_mode(regs) && (regs->pstate & PSR_MODE32_BIT) &&
1688 (regs->pstate & COMPAT_PSR_A_BIT) == 0 &&
1689 (regs->pstate & COMPAT_PSR_I_BIT) == 0 &&
1690 (regs->pstate & COMPAT_PSR_F_BIT) == 0) {
1691 return 1;
1692 }
1693
1694
1695
1696
1697
1698 regs->pstate &= COMPAT_PSR_N_BIT | COMPAT_PSR_Z_BIT |
1699 COMPAT_PSR_C_BIT | COMPAT_PSR_V_BIT |
1700 COMPAT_PSR_Q_BIT | COMPAT_PSR_IT_MASK |
1701 COMPAT_PSR_GE_MASK | COMPAT_PSR_E_BIT |
1702 COMPAT_PSR_T_BIT;
1703 regs->pstate |= PSR_MODE32_BIT;
1704
1705 return 0;
1706}
1707
1708static int valid_native_regs(struct user_pt_regs *regs)
1709{
1710 regs->pstate &= ~SPSR_EL1_AARCH64_RES0_BITS;
1711
1712 if (user_mode(regs) && !(regs->pstate & PSR_MODE32_BIT) &&
1713 (regs->pstate & PSR_D_BIT) == 0 &&
1714 (regs->pstate & PSR_A_BIT) == 0 &&
1715 (regs->pstate & PSR_I_BIT) == 0 &&
1716 (regs->pstate & PSR_F_BIT) == 0) {
1717 return 1;
1718 }
1719
1720
1721 regs->pstate &= PSR_N_BIT | PSR_Z_BIT | PSR_C_BIT | PSR_V_BIT;
1722
1723 return 0;
1724}
1725
1726
1727
1728
1729
1730int valid_user_regs(struct user_pt_regs *regs, struct task_struct *task)
1731{
1732 if (!test_tsk_thread_flag(task, TIF_SINGLESTEP))
1733 regs->pstate &= ~DBG_SPSR_SS;
1734
1735 if (is_compat_thread(task_thread_info(task)))
1736 return valid_compat_regs(regs);
1737 else
1738 return valid_native_regs(regs);
1739}
1740
