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Merge tag 'master-2014-11-25' of git://git.kernel.org/pub/scm/linux/kernel/git/linvil...
[deliverable/linux.git] / arch / arm64 / kernel / ptrace.c
CommitLineData
478fcb2c
WD		 1/*
2 * Based on arch/arm/kernel/ptrace.c
3 *
4 * By Ross Biro 1/23/92
5 * edited by Linus Torvalds
6 * ARM modifications Copyright (C) 2000 Russell King
7 * Copyright (C) 2012 ARM Ltd.
8 *
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.
12 *
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.
17 *
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/>.
20 */
21
5701ede8 22#include <linux/audit.h>
fd92d4a5 23#include <linux/compat.h>
478fcb2c
WD		 24#include <linux/kernel.h>
25#include <linux/sched.h>
26#include <linux/mm.h>
27#include <linux/smp.h>
28#include <linux/ptrace.h>
29#include <linux/user.h>
30#include <linux/security.h>
31#include <linux/init.h>
32#include <linux/signal.h>
33#include <linux/uaccess.h>
34#include <linux/perf_event.h>
35#include <linux/hw_breakpoint.h>
36#include <linux/regset.h>
37#include <linux/tracehook.h>
38#include <linux/elf.h>
39
40#include <asm/compat.h>
41#include <asm/debug-monitors.h>
42#include <asm/pgtable.h>
5701ede8 43#include <asm/syscall.h>
478fcb2c
WD		 44#include <asm/traps.h>
45#include <asm/system_misc.h>
46
055b1212
AT		 47#define CREATE_TRACE_POINTS
48#include <trace/events/syscalls.h>
49
478fcb2c
WD		 50/*
51 * TODO: does not yet catch signals sent when the child dies.
52 * in exit.c or in signal.c.
53 */
54
55/*
56 * Called by kernel/ptrace.c when detaching..
57 */
58void ptrace_disable(struct task_struct *child)
59{
60}
61
478fcb2c
WD		 62#ifdef CONFIG_HAVE_HW_BREAKPOINT
63/*
64 * Handle hitting a HW-breakpoint.
65 */
66static void ptrace_hbptriggered(struct perf_event *bp,
67 struct perf_sample_data *data,
68 struct pt_regs *regs)
69{
70 struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
71 siginfo_t info = {
72 .si_signo = SIGTRAP,
73 .si_errno = 0,
74 .si_code = TRAP_HWBKPT,
75 .si_addr = (void __user *)(bkpt->trigger),
76 };
77
78#ifdef CONFIG_COMPAT
79 int i;
80
81 if (!is_compat_task())
82 goto send_sig;
83
84 for (i = 0; i < ARM_MAX_BRP; ++i) {
85 if (current->thread.debug.hbp_break[i] == bp) {
86 info.si_errno = (i << 1) + 1;
87 break;
88 }
89 }
27d7ff27
WD		 90
91 for (i = 0; i < ARM_MAX_WRP; ++i) {
478fcb2c
WD		 92 if (current->thread.debug.hbp_watch[i] == bp) {
93 info.si_errno = -((i << 1) + 1);
94 break;
95 }
96 }
97
98send_sig:
99#endif
100 force_sig_info(SIGTRAP, &info, current);
101}
102
103/*
104 * Unregister breakpoints from this task and reset the pointers in
105 * the thread_struct.
106 */
107void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
108{
109 int i;
110 struct thread_struct *t = &tsk->thread;
111
112 for (i = 0; i < ARM_MAX_BRP; i++) {
113 if (t->debug.hbp_break[i]) {
114 unregister_hw_breakpoint(t->debug.hbp_break[i]);
115 t->debug.hbp_break[i] = NULL;
116 }
117 }
118
119 for (i = 0; i < ARM_MAX_WRP; i++) {
120 if (t->debug.hbp_watch[i]) {
121 unregister_hw_breakpoint(t->debug.hbp_watch[i]);
122 t->debug.hbp_watch[i] = NULL;
123 }
124 }
125}
126
127void ptrace_hw_copy_thread(struct task_struct *tsk)
128{
129 memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
130}
131
132static struct perf_event *ptrace_hbp_get_event(unsigned int note_type,
133 struct task_struct *tsk,
134 unsigned long idx)
135{
136 struct perf_event *bp = ERR_PTR(-EINVAL);
137
138 switch (note_type) {
139 case NT_ARM_HW_BREAK:
140 if (idx < ARM_MAX_BRP)
141 bp = tsk->thread.debug.hbp_break[idx];
142 break;
143 case NT_ARM_HW_WATCH:
144 if (idx < ARM_MAX_WRP)
145 bp = tsk->thread.debug.hbp_watch[idx];
146 break;
147 }
148
149 return bp;
150}
151
152static int ptrace_hbp_set_event(unsigned int note_type,
153 struct task_struct *tsk,
154 unsigned long idx,
155 struct perf_event *bp)
156{
157 int err = -EINVAL;
158
159 switch (note_type) {
160 case NT_ARM_HW_BREAK:
161 if (idx < ARM_MAX_BRP) {
162 tsk->thread.debug.hbp_break[idx] = bp;
163 err = 0;
164 }
165 break;
166 case NT_ARM_HW_WATCH:
167 if (idx < ARM_MAX_WRP) {
168 tsk->thread.debug.hbp_watch[idx] = bp;
169 err = 0;
170 }
171 break;
172 }
173
174 return err;
175}
176
177static struct perf_event *ptrace_hbp_create(unsigned int note_type,
178 struct task_struct *tsk,
179 unsigned long idx)
180{
181 struct perf_event *bp;
182 struct perf_event_attr attr;
183 int err, type;
184
185 switch (note_type) {
186 case NT_ARM_HW_BREAK:
187 type = HW_BREAKPOINT_X;
188 break;
189 case NT_ARM_HW_WATCH:
190 type = HW_BREAKPOINT_RW;
191 break;
192 default:
193 return ERR_PTR(-EINVAL);
194 }
195
196 ptrace_breakpoint_init(&attr);
197
198 /*
199 * Initialise fields to sane defaults
200 * (i.e. values that will pass validation).
201 */
202 attr.bp_addr = 0;
203 attr.bp_len = HW_BREAKPOINT_LEN_4;
204 attr.bp_type = type;
205 attr.disabled = 1;
206
207 bp = register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, tsk);
208 if (IS_ERR(bp))
209 return bp;
210
211 err = ptrace_hbp_set_event(note_type, tsk, idx, bp);
212 if (err)
213 return ERR_PTR(err);
214
215 return bp;
216}
217
218static int ptrace_hbp_fill_attr_ctrl(unsigned int note_type,
219 struct arch_hw_breakpoint_ctrl ctrl,
220 struct perf_event_attr *attr)
221{
8f34a1da
WD		 222 int err, len, type, disabled = !ctrl.enabled;
223
cdc27c27
WD		 224 attr->disabled = disabled;
225 if (disabled)
226 return 0;
227
228 err = arch_bp_generic_fields(ctrl, &len, &type);
229 if (err)
230 return err;
231
232 switch (note_type) {
233 case NT_ARM_HW_BREAK:
234 if ((type & HW_BREAKPOINT_X) != type)
478fcb2c 235 return -EINVAL;
cdc27c27
WD		 236 break;
237 case NT_ARM_HW_WATCH:
238 if ((type & HW_BREAKPOINT_RW) != type)
239 return -EINVAL;
240 break;
241 default:
242 return -EINVAL;
478fcb2c
WD		 243 }
244
245 attr->bp_len = len;
246 attr->bp_type = type;
478fcb2c
WD		 247
248 return 0;
249}
250
251static int ptrace_hbp_get_resource_info(unsigned int note_type, u32 *info)
252{
253 u8 num;
254 u32 reg = 0;
255
256 switch (note_type) {
257 case NT_ARM_HW_BREAK:
258 num = hw_breakpoint_slots(TYPE_INST);
259 break;
260 case NT_ARM_HW_WATCH:
261 num = hw_breakpoint_slots(TYPE_DATA);
262 break;
263 default:
264 return -EINVAL;
265 }
266
267 reg |= debug_monitors_arch();
268 reg <<= 8;
269 reg |= num;
270
271 *info = reg;
272 return 0;
273}
274
275static int ptrace_hbp_get_ctrl(unsigned int note_type,
276 struct task_struct *tsk,
277 unsigned long idx,
278 u32 *ctrl)
279{
280 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
281
282 if (IS_ERR(bp))
283 return PTR_ERR(bp);
284
285 *ctrl = bp ? encode_ctrl_reg(counter_arch_bp(bp)->ctrl) : 0;
286 return 0;
287}
288
289static int ptrace_hbp_get_addr(unsigned int note_type,
290 struct task_struct *tsk,
291 unsigned long idx,
292 u64 *addr)
293{
294 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
295
296 if (IS_ERR(bp))
297 return PTR_ERR(bp);
298
299 *addr = bp ? bp->attr.bp_addr : 0;
300 return 0;
301}
302
303static struct perf_event *ptrace_hbp_get_initialised_bp(unsigned int note_type,
304 struct task_struct *tsk,
305 unsigned long idx)
306{
307 struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
308
309 if (!bp)
310 bp = ptrace_hbp_create(note_type, tsk, idx);
311
312 return bp;
313}
314
315static int ptrace_hbp_set_ctrl(unsigned int note_type,
316 struct task_struct *tsk,
317 unsigned long idx,
318 u32 uctrl)
319{
320 int err;
321 struct perf_event *bp;
322 struct perf_event_attr attr;
323 struct arch_hw_breakpoint_ctrl ctrl;
324
325 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
326 if (IS_ERR(bp)) {
327 err = PTR_ERR(bp);
328 return err;
329 }
330
331 attr = bp->attr;
332 decode_ctrl_reg(uctrl, &ctrl);
333 err = ptrace_hbp_fill_attr_ctrl(note_type, ctrl, &attr);
334 if (err)
335 return err;
336
337 return modify_user_hw_breakpoint(bp, &attr);
338}
339
340static int ptrace_hbp_set_addr(unsigned int note_type,
341 struct task_struct *tsk,
342 unsigned long idx,
343 u64 addr)
344{
345 int err;
346 struct perf_event *bp;
347 struct perf_event_attr attr;
348
349 bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
350 if (IS_ERR(bp)) {
351 err = PTR_ERR(bp);
352 return err;
353 }
354
355 attr = bp->attr;
356 attr.bp_addr = addr;
357 err = modify_user_hw_breakpoint(bp, &attr);
358 return err;
359}
360
361#define PTRACE_HBP_ADDR_SZ sizeof(u64)
362#define PTRACE_HBP_CTRL_SZ sizeof(u32)
7797d17c 363#define PTRACE_HBP_PAD_SZ sizeof(u32)
478fcb2c
WD		 364
365static int hw_break_get(struct task_struct *target,
366 const struct user_regset *regset,
367 unsigned int pos, unsigned int count,
368 void *kbuf, void __user *ubuf)
369{
370 unsigned int note_type = regset->core_note_type;
7797d17c 371 int ret, idx = 0, offset, limit;
478fcb2c
WD		 372 u32 info, ctrl;
373 u64 addr;
374
375 /* Resource info */
376 ret = ptrace_hbp_get_resource_info(note_type, &info);
377 if (ret)
378 return ret;
379
7797d17c
WD		 380 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0,
381 sizeof(info));
382 if (ret)
383 return ret;
384
385 /* Pad */
386 offset = offsetof(struct user_hwdebug_state, pad);
387 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, offset,
388 offset + PTRACE_HBP_PAD_SZ);
478fcb2c
WD		 389 if (ret)
390 return ret;
391
392 /* (address, ctrl) registers */
7797d17c 393 offset = offsetof(struct user_hwdebug_state, dbg_regs);
478fcb2c
WD		 394 limit = regset->n * regset->size;
395 while (count && offset < limit) {
396 ret = ptrace_hbp_get_addr(note_type, target, idx, &addr);
397 if (ret)
398 return ret;
399 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &addr,
400 offset, offset + PTRACE_HBP_ADDR_SZ);
401 if (ret)
402 return ret;
403 offset += PTRACE_HBP_ADDR_SZ;
404
405 ret = ptrace_hbp_get_ctrl(note_type, target, idx, &ctrl);
406 if (ret)
407 return ret;
408 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &ctrl,
409 offset, offset + PTRACE_HBP_CTRL_SZ);
410 if (ret)
411 return ret;
412 offset += PTRACE_HBP_CTRL_SZ;
7797d17c
WD		 413
414 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
415 offset,
416 offset + PTRACE_HBP_PAD_SZ);
417 if (ret)
418 return ret;
419 offset += PTRACE_HBP_PAD_SZ;
478fcb2c
WD		 420 idx++;
421 }
422
423 return 0;
424}
425
426static int hw_break_set(struct task_struct *target,
427 const struct user_regset *regset,
428 unsigned int pos, unsigned int count,
429 const void *kbuf, const void __user *ubuf)
430{
431 unsigned int note_type = regset->core_note_type;
7797d17c 432 int ret, idx = 0, offset, limit;
478fcb2c
WD		 433 u32 ctrl;
434 u64 addr;
435
7797d17c
WD		 436 /* Resource info and pad */
437 offset = offsetof(struct user_hwdebug_state, dbg_regs);
438 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
478fcb2c
WD		 439 if (ret)
440 return ret;
441
442 /* (address, ctrl) registers */
443 limit = regset->n * regset->size;
444 while (count && offset < limit) {
445 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
446 offset, offset + PTRACE_HBP_ADDR_SZ);
447 if (ret)
448 return ret;
449 ret = ptrace_hbp_set_addr(note_type, target, idx, addr);
450 if (ret)
451 return ret;
452 offset += PTRACE_HBP_ADDR_SZ;
453
454 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
455 offset, offset + PTRACE_HBP_CTRL_SZ);
456 if (ret)
457 return ret;
458 ret = ptrace_hbp_set_ctrl(note_type, target, idx, ctrl);
459 if (ret)
460 return ret;
461 offset += PTRACE_HBP_CTRL_SZ;
7797d17c
WD		 462
463 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
464 offset,
465 offset + PTRACE_HBP_PAD_SZ);
466 if (ret)
467 return ret;
468 offset += PTRACE_HBP_PAD_SZ;
478fcb2c
WD		 469 idx++;
470 }
471
472 return 0;
473}
474#endif /* CONFIG_HAVE_HW_BREAKPOINT */
475
476static int gpr_get(struct task_struct *target,
477 const struct user_regset *regset,
478 unsigned int pos, unsigned int count,
479 void *kbuf, void __user *ubuf)
480{
481 struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
482 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
483}
484
485static int gpr_set(struct task_struct *target, const struct user_regset *regset,
486 unsigned int pos, unsigned int count,
487 const void *kbuf, const void __user *ubuf)
488{
489 int ret;
490 struct user_pt_regs newregs;
491
492 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
493 if (ret)
494 return ret;
495
496 if (!valid_user_regs(&newregs))
497 return -EINVAL;
498
499 task_pt_regs(target)->user_regs = newregs;
500 return 0;
501}
502
503/*
504 * TODO: update fp accessors for lazy context switching (sync/flush hwstate)
505 */
506static int fpr_get(struct task_struct *target, const struct user_regset *regset,
507 unsigned int pos, unsigned int count,
508 void *kbuf, void __user *ubuf)
509{
510 struct user_fpsimd_state *uregs;
511 uregs = &target->thread.fpsimd_state.user_fpsimd;
512 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
513}
514
515static int fpr_set(struct task_struct *target, const struct user_regset *regset,
516 unsigned int pos, unsigned int count,
517 const void *kbuf, const void __user *ubuf)
518{
519 int ret;
520 struct user_fpsimd_state newstate;
521
522 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
523 if (ret)
524 return ret;
525
526 target->thread.fpsimd_state.user_fpsimd = newstate;
005f78cd 527 fpsimd_flush_task_state(target);
478fcb2c
WD		 528 return ret;
529}
530
531static int tls_get(struct task_struct *target, const struct user_regset *regset,
532 unsigned int pos, unsigned int count,
533 void *kbuf, void __user *ubuf)
534{
535 unsigned long *tls = &target->thread.tp_value;
536 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, tls, 0, -1);
537}
538
539static int tls_set(struct task_struct *target, const struct user_regset *regset,
540 unsigned int pos, unsigned int count,
541 const void *kbuf, const void __user *ubuf)
542{
543 int ret;
544 unsigned long tls;
545
546 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
547 if (ret)
548 return ret;
549
550 target->thread.tp_value = tls;
551 return ret;
552}
553
554enum aarch64_regset {
555 REGSET_GPR,
556 REGSET_FPR,
557 REGSET_TLS,
558#ifdef CONFIG_HAVE_HW_BREAKPOINT
559 REGSET_HW_BREAK,
560 REGSET_HW_WATCH,
561#endif
562};
563
564static const struct user_regset aarch64_regsets[] = {
565 [REGSET_GPR] = {
566 .core_note_type = NT_PRSTATUS,
567 .n = sizeof(struct user_pt_regs) / sizeof(u64),
568 .size = sizeof(u64),
569 .align = sizeof(u64),
570 .get = gpr_get,
571 .set = gpr_set
572 },
573 [REGSET_FPR] = {
574 .core_note_type = NT_PRFPREG,
575 .n = sizeof(struct user_fpsimd_state) / sizeof(u32),
576 /*
577 * We pretend we have 32-bit registers because the fpsr and
578 * fpcr are 32-bits wide.
579 */
580 .size = sizeof(u32),
581 .align = sizeof(u32),
582 .get = fpr_get,
583 .set = fpr_set
584 },
585 [REGSET_TLS] = {
586 .core_note_type = NT_ARM_TLS,
587 .n = 1,
588 .size = sizeof(void *),
589 .align = sizeof(void *),
590 .get = tls_get,
591 .set = tls_set,
592 },
593#ifdef CONFIG_HAVE_HW_BREAKPOINT
594 [REGSET_HW_BREAK] = {
595 .core_note_type = NT_ARM_HW_BREAK,
596 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
597 .size = sizeof(u32),
598 .align = sizeof(u32),
599 .get = hw_break_get,
600 .set = hw_break_set,
601 },
602 [REGSET_HW_WATCH] = {
603 .core_note_type = NT_ARM_HW_WATCH,
604 .n = sizeof(struct user_hwdebug_state) / sizeof(u32),
605 .size = sizeof(u32),
606 .align = sizeof(u32),
607 .get = hw_break_get,
608 .set = hw_break_set,
609 },
610#endif
611};
612
613static const struct user_regset_view user_aarch64_view = {
614 .name = "aarch64", .e_machine = EM_AARCH64,
615 .regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets)
616};
617
618#ifdef CONFIG_COMPAT
619#include <linux/compat.h>
620
621enum compat_regset {
622 REGSET_COMPAT_GPR,
623 REGSET_COMPAT_VFP,
624};
625
626static int compat_gpr_get(struct task_struct *target,
627 const struct user_regset *regset,
628 unsigned int pos, unsigned int count,
629 void *kbuf, void __user *ubuf)
630{
631 int ret = 0;
632 unsigned int i, start, num_regs;
633
634 /* Calculate the number of AArch32 registers contained in count */
635 num_regs = count / regset->size;
636
637 /* Convert pos into an register number */
638 start = pos / regset->size;
639
640 if (start + num_regs > regset->n)
641 return -EIO;
642
643 for (i = 0; i < num_regs; ++i) {
644 unsigned int idx = start + i;
6a2e5e52 645 compat_ulong_t reg;
478fcb2c
WD		 646
647 switch (idx) {
648 case 15:
6a2e5e52 649 reg = task_pt_regs(target)->pc;
478fcb2c
WD		 650 break;
651 case 16:
6a2e5e52 652 reg = task_pt_regs(target)->pstate;
478fcb2c
WD		 653 break;
654 case 17:
6a2e5e52 655 reg = task_pt_regs(target)->orig_x0;
478fcb2c
WD		 656 break;
657 default:
6a2e5e52 658 reg = task_pt_regs(target)->regs[idx];
478fcb2c
WD		 659 }
660
2227901a
VK		 661 if (kbuf) {
662 memcpy(kbuf, &reg, sizeof(reg));
663 kbuf += sizeof(reg);
664 } else {
665 ret = copy_to_user(ubuf, &reg, sizeof(reg));
85487edd
WD		 666 if (ret) {
667 ret = -EFAULT;
2227901a 668 break;
85487edd 669 }
2227901a
VK		 670
671 ubuf += sizeof(reg);
672 }
478fcb2c
WD		 673 }
674
675 return ret;
676}
677
678static int compat_gpr_set(struct task_struct *target,
679 const struct user_regset *regset,
680 unsigned int pos, unsigned int count,
681 const void *kbuf, const void __user *ubuf)
682{
683 struct pt_regs newregs;
684 int ret = 0;
685 unsigned int i, start, num_regs;
686
687 /* Calculate the number of AArch32 registers contained in count */
688 num_regs = count / regset->size;
689
690 /* Convert pos into an register number */
691 start = pos / regset->size;
692
693 if (start + num_regs > regset->n)
694 return -EIO;
695
696 newregs = *task_pt_regs(target);
697
698 for (i = 0; i < num_regs; ++i) {
699 unsigned int idx = start + i;
6a2e5e52
ML		 700 compat_ulong_t reg;
701
2227901a
VK		 702 if (kbuf) {
703 memcpy(&reg, kbuf, sizeof(reg));
704 kbuf += sizeof(reg);
705 } else {
706 ret = copy_from_user(&reg, ubuf, sizeof(reg));
85487edd
WD		 707 if (ret) {
708 ret = -EFAULT;
709 break;
710 }
6a2e5e52 711
2227901a
VK		 712 ubuf += sizeof(reg);
713 }
478fcb2c
WD		 714
715 switch (idx) {
716 case 15:
6a2e5e52 717 newregs.pc = reg;
478fcb2c
WD		 718 break;
719 case 16:
6a2e5e52 720 newregs.pstate = reg;
478fcb2c
WD		 721 break;
722 case 17:
6a2e5e52 723 newregs.orig_x0 = reg;
478fcb2c
WD		 724 break;
725 default:
6a2e5e52 726 newregs.regs[idx] = reg;
478fcb2c
WD		 727 }
728
478fcb2c
WD		 729 }
730
731 if (valid_user_regs(&newregs.user_regs))
732 *task_pt_regs(target) = newregs;
733 else
734 ret = -EINVAL;
735
478fcb2c
WD		 736 return ret;
737}
738
739static int compat_vfp_get(struct task_struct *target,
740 const struct user_regset *regset,
741 unsigned int pos, unsigned int count,
742 void *kbuf, void __user *ubuf)
743{
744 struct user_fpsimd_state *uregs;
745 compat_ulong_t fpscr;
746 int ret;
747
748 uregs = &target->thread.fpsimd_state.user_fpsimd;
749
750 /*
751 * The VFP registers are packed into the fpsimd_state, so they all sit
752 * nicely together for us. We just need to create the fpscr separately.
753 */
754 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
755 VFP_STATE_SIZE - sizeof(compat_ulong_t));
756
757 if (count && !ret) {
758 fpscr = (uregs->fpsr & VFP_FPSCR_STAT_MASK) |
759 (uregs->fpcr & VFP_FPSCR_CTRL_MASK);
760 ret = put_user(fpscr, (compat_ulong_t *)ubuf);
761 }
762
763 return ret;
764}
765
766static int compat_vfp_set(struct task_struct *target,
767 const struct user_regset *regset,
768 unsigned int pos, unsigned int count,
769 const void *kbuf, const void __user *ubuf)
770{
771 struct user_fpsimd_state *uregs;
772 compat_ulong_t fpscr;
773 int ret;
774
775 if (pos + count > VFP_STATE_SIZE)
776 return -EIO;
777
778 uregs = &target->thread.fpsimd_state.user_fpsimd;
779
780 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
781 VFP_STATE_SIZE - sizeof(compat_ulong_t));
782
783 if (count && !ret) {
784 ret = get_user(fpscr, (compat_ulong_t *)ubuf);
785 uregs->fpsr = fpscr & VFP_FPSCR_STAT_MASK;
786 uregs->fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
787 }
788
005f78cd 789 fpsimd_flush_task_state(target);
478fcb2c
WD		 790 return ret;
791}
792
793static const struct user_regset aarch32_regsets[] = {
794 [REGSET_COMPAT_GPR] = {
795 .core_note_type = NT_PRSTATUS,
796 .n = COMPAT_ELF_NGREG,
797 .size = sizeof(compat_elf_greg_t),
798 .align = sizeof(compat_elf_greg_t),
799 .get = compat_gpr_get,
800 .set = compat_gpr_set
801 },
802 [REGSET_COMPAT_VFP] = {
803 .core_note_type = NT_ARM_VFP,
804 .n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
805 .size = sizeof(compat_ulong_t),
806 .align = sizeof(compat_ulong_t),
807 .get = compat_vfp_get,
808 .set = compat_vfp_set
809 },
810};
811
812static const struct user_regset_view user_aarch32_view = {
813 .name = "aarch32", .e_machine = EM_ARM,
814 .regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets)
815};
816
478fcb2c
WD		 817static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
818 compat_ulong_t __user *ret)
819{
820 compat_ulong_t tmp;
821
822 if (off & 3)
823 return -EIO;
824
7606c37d 825 if (off == COMPAT_PT_TEXT_ADDR)
478fcb2c 826 tmp = tsk->mm->start_code;
7606c37d 827 else if (off == COMPAT_PT_DATA_ADDR)
478fcb2c 828 tmp = tsk->mm->start_data;
7606c37d 829 else if (off == COMPAT_PT_TEXT_END_ADDR)
478fcb2c
WD		 830 tmp = tsk->mm->end_code;
831 else if (off < sizeof(compat_elf_gregset_t))
832 return copy_regset_to_user(tsk, &user_aarch32_view,
833 REGSET_COMPAT_GPR, off,
834 sizeof(compat_ulong_t), ret);
835 else if (off >= COMPAT_USER_SZ)
836 return -EIO;
837 else
838 tmp = 0;
839
840 return put_user(tmp, ret);
841}
842
843static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off,
844 compat_ulong_t val)
845{
846 int ret;
c1688707 847 mm_segment_t old_fs = get_fs();
478fcb2c
WD		 848
849 if (off & 3 || off >= COMPAT_USER_SZ)
850 return -EIO;
851
852 if (off >= sizeof(compat_elf_gregset_t))
853 return 0;
854
c1688707 855 set_fs(KERNEL_DS);
478fcb2c
WD		 856 ret = copy_regset_from_user(tsk, &user_aarch32_view,
857 REGSET_COMPAT_GPR, off,
858 sizeof(compat_ulong_t),
859 &val);
c1688707
WD		 860 set_fs(old_fs);
861
478fcb2c
WD		 862 return ret;
863}
864
865#ifdef CONFIG_HAVE_HW_BREAKPOINT
866
867/*
868 * Convert a virtual register number into an index for a thread_info
869 * breakpoint array. Breakpoints are identified using positive numbers
870 * whilst watchpoints are negative. The registers are laid out as pairs
871 * of (address, control), each pair mapping to a unique hw_breakpoint struct.
872 * Register 0 is reserved for describing resource information.
873 */
874static int compat_ptrace_hbp_num_to_idx(compat_long_t num)
875{
876 return (abs(num) - 1) >> 1;
877}
878
879static int compat_ptrace_hbp_get_resource_info(u32 *kdata)
880{
881 u8 num_brps, num_wrps, debug_arch, wp_len;
882 u32 reg = 0;
883
884 num_brps = hw_breakpoint_slots(TYPE_INST);
885 num_wrps = hw_breakpoint_slots(TYPE_DATA);
886
887 debug_arch = debug_monitors_arch();
888 wp_len = 8;
889 reg |= debug_arch;
890 reg <<= 8;
891 reg |= wp_len;
892 reg <<= 8;
893 reg |= num_wrps;
894 reg <<= 8;
895 reg |= num_brps;
896
897 *kdata = reg;
898 return 0;
899}
900
901static int compat_ptrace_hbp_get(unsigned int note_type,
902 struct task_struct *tsk,
903 compat_long_t num,
904 u32 *kdata)
905{
906 u64 addr = 0;
907 u32 ctrl = 0;
908
909 int err, idx = compat_ptrace_hbp_num_to_idx(num);;
910
911 if (num & 1) {
912 err = ptrace_hbp_get_addr(note_type, tsk, idx, &addr);
913 *kdata = (u32)addr;
914 } else {
915 err = ptrace_hbp_get_ctrl(note_type, tsk, idx, &ctrl);
916 *kdata = ctrl;
917 }
918
919 return err;
920}
921
922static int compat_ptrace_hbp_set(unsigned int note_type,
923 struct task_struct *tsk,
924 compat_long_t num,
925 u32 *kdata)
926{
927 u64 addr;
928 u32 ctrl;
929
930 int err, idx = compat_ptrace_hbp_num_to_idx(num);
931
932 if (num & 1) {
933 addr = *kdata;
934 err = ptrace_hbp_set_addr(note_type, tsk, idx, addr);
935 } else {
936 ctrl = *kdata;
937 err = ptrace_hbp_set_ctrl(note_type, tsk, idx, ctrl);
938 }
939
940 return err;
941}
942
943static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
944 compat_ulong_t __user *data)
945{
946 int ret;
947 u32 kdata;
948 mm_segment_t old_fs = get_fs();
949
950 set_fs(KERNEL_DS);
951 /* Watchpoint */
952 if (num < 0) {
953 ret = compat_ptrace_hbp_get(NT_ARM_HW_WATCH, tsk, num, &kdata);
954 /* Resource info */
955 } else if (num == 0) {
956 ret = compat_ptrace_hbp_get_resource_info(&kdata);
957 /* Breakpoint */
958 } else {
959 ret = compat_ptrace_hbp_get(NT_ARM_HW_BREAK, tsk, num, &kdata);
960 }
961 set_fs(old_fs);
962
963 if (!ret)
964 ret = put_user(kdata, data);
965
966 return ret;
967}
968
969static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
970 compat_ulong_t __user *data)
971{
972 int ret;
973 u32 kdata = 0;
974 mm_segment_t old_fs = get_fs();
975
976 if (num == 0)
977 return 0;
978
979 ret = get_user(kdata, data);
980 if (ret)
981 return ret;
982
983 set_fs(KERNEL_DS);
984 if (num < 0)
985 ret = compat_ptrace_hbp_set(NT_ARM_HW_WATCH, tsk, num, &kdata);
986 else
987 ret = compat_ptrace_hbp_set(NT_ARM_HW_BREAK, tsk, num, &kdata);
988 set_fs(old_fs);
989
990 return ret;
991}
992#endif /* CONFIG_HAVE_HW_BREAKPOINT */
993
994long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
995 compat_ulong_t caddr, compat_ulong_t cdata)
996{
997 unsigned long addr = caddr;
998 unsigned long data = cdata;
999 void __user *datap = compat_ptr(data);
1000 int ret;
1001
1002 switch (request) {
1003 case PTRACE_PEEKUSR:
1004 ret = compat_ptrace_read_user(child, addr, datap);
1005 break;
1006
1007 case PTRACE_POKEUSR:
1008 ret = compat_ptrace_write_user(child, addr, data);
1009 break;
1010
27aa55c5 1011 case COMPAT_PTRACE_GETREGS:
478fcb2c
WD		 1012 ret = copy_regset_to_user(child,
1013 &user_aarch32_view,
1014 REGSET_COMPAT_GPR,
1015 0, sizeof(compat_elf_gregset_t),
1016 datap);
1017 break;
1018
27aa55c5 1019 case COMPAT_PTRACE_SETREGS:
478fcb2c
WD		 1020 ret = copy_regset_from_user(child,
1021 &user_aarch32_view,
1022 REGSET_COMPAT_GPR,
1023 0, sizeof(compat_elf_gregset_t),
1024 datap);
1025 break;
1026
27aa55c5 1027 case COMPAT_PTRACE_GET_THREAD_AREA:
478fcb2c
WD		 1028 ret = put_user((compat_ulong_t)child->thread.tp_value,
1029 (compat_ulong_t __user *)datap);
1030 break;
1031
27aa55c5 1032 case COMPAT_PTRACE_SET_SYSCALL:
478fcb2c
WD		 1033 task_pt_regs(child)->syscallno = data;
1034 ret = 0;
1035 break;
1036
1037 case COMPAT_PTRACE_GETVFPREGS:
1038 ret = copy_regset_to_user(child,
1039 &user_aarch32_view,
1040 REGSET_COMPAT_VFP,
1041 0, VFP_STATE_SIZE,
1042 datap);
1043 break;
1044
1045 case COMPAT_PTRACE_SETVFPREGS:
1046 ret = copy_regset_from_user(child,
1047 &user_aarch32_view,
1048 REGSET_COMPAT_VFP,
1049 0, VFP_STATE_SIZE,
1050 datap);
1051 break;
1052
1053#ifdef CONFIG_HAVE_HW_BREAKPOINT
27aa55c5 1054 case COMPAT_PTRACE_GETHBPREGS:
478fcb2c
WD		 1055 ret = compat_ptrace_gethbpregs(child, addr, datap);
1056 break;
1057
27aa55c5 1058 case COMPAT_PTRACE_SETHBPREGS:
478fcb2c
WD		 1059 ret = compat_ptrace_sethbpregs(child, addr, datap);
1060 break;
1061#endif
1062
1063 default:
1064 ret = compat_ptrace_request(child, request, addr,
1065 data);
1066 break;
1067 }
1068
1069 return ret;
1070}
1071#endif /* CONFIG_COMPAT */
1072
1073const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1074{
1075#ifdef CONFIG_COMPAT
1076 if (is_compat_thread(task_thread_info(task)))
1077 return &user_aarch32_view;
1078#endif
1079 return &user_aarch64_view;
1080}
1081
1082long arch_ptrace(struct task_struct *child, long request,
1083 unsigned long addr, unsigned long data)
1084{
1085 return ptrace_request(child, request, addr, data);
1086}
1087
3157858f
AT		 1088enum ptrace_syscall_dir {
1089 PTRACE_SYSCALL_ENTER = 0,
1090 PTRACE_SYSCALL_EXIT,
1091};
1092
1093static void tracehook_report_syscall(struct pt_regs *regs,
1094 enum ptrace_syscall_dir dir)
478fcb2c 1095{
3157858f 1096 int regno;
478fcb2c
WD		 1097 unsigned long saved_reg;
1098
3157858f
AT		 1099 /*
1100 * A scratch register (ip(r12) on AArch32, x7 on AArch64) is
1101 * used to denote syscall entry/exit:
1102 */
1103 regno = (is_compat_task() ? 12 : 7);
1104 saved_reg = regs->regs[regno];
1105 regs->regs[regno] = dir;
478fcb2c 1106
3157858f 1107 if (dir == PTRACE_SYSCALL_EXIT)
478fcb2c
WD		 1108 tracehook_report_syscall_exit(regs, 0);
1109 else if (tracehook_report_syscall_entry(regs))
1110 regs->syscallno = ~0UL;
1111
3157858f
AT		 1112 regs->regs[regno] = saved_reg;
1113}
1114
1115asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1116{
1117 if (test_thread_flag(TIF_SYSCALL_TRACE))
1118 tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
478fcb2c 1119
055b1212
AT		 1120 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
1121 trace_sys_enter(regs, regs->syscallno);
1122
4913c598
EP		 1123 audit_syscall_entry(regs->syscallno, regs->orig_x0, regs->regs[1],
1124 regs->regs[2], regs->regs[3]);
5701ede8 1125
478fcb2c
WD		 1126 return regs->syscallno;
1127}
3157858f
AT		 1128
1129asmlinkage void syscall_trace_exit(struct pt_regs *regs)
1130{
5701ede8
AT		 1131 audit_syscall_exit(regs);
1132
055b1212
AT		 1133 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
1134 trace_sys_exit(regs, regs_return_value(regs));
1135
3157858f
AT		 1136 if (test_thread_flag(TIF_SYSCALL_TRACE))
1137 tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);
1138}
Linux kernel - Deliverables
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