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1// SPDX-License-Identifier: GPL-2.0-only
2/* ptrace.c: Sparc process tracing support.
3 *
4 * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
5 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 *
7 * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
8 * and David Mosberger.
9 *
10 * Added Linux support -miguel (weird, eh?, the original code was meant
11 * to emulate SunOS).
12 */
13
14#include <linux/kernel.h>
15#include <linux/sched.h>
16#include <linux/sched/task_stack.h>
17#include <linux/mm.h>
18#include <linux/errno.h>
19#include <linux/export.h>
20#include <linux/ptrace.h>
21#include <linux/user.h>
22#include <linux/smp.h>
23#include <linux/security.h>
24#include <linux/seccomp.h>
25#include <linux/audit.h>
26#include <linux/signal.h>
27#include <linux/regset.h>
28#include <trace/syscall.h>
29#include <linux/compat.h>
30#include <linux/elf.h>
31#include <linux/context_tracking.h>
32
33#include <asm/asi.h>
34#include <linux/uaccess.h>
35#include <asm/psrcompat.h>
36#include <asm/visasm.h>
37#include <asm/spitfire.h>
38#include <asm/page.h>
39#include <asm/cpudata.h>
40#include <asm/cacheflush.h>
41
42#define CREATE_TRACE_POINTS
43#include <trace/events/syscalls.h>
44
45#include "entry.h"
46
47/* #define ALLOW_INIT_TRACING */
48
49struct pt_regs_offset {
50 const char *name;
51 int offset;
52};
53
54#define REG_OFFSET_NAME(n, r) \
55 {.name = n, .offset = (PT_V9_##r)}
56#define REG_OFFSET_END {.name = NULL, .offset = 0}
57
58static const struct pt_regs_offset regoffset_table[] = {
59 REG_OFFSET_NAME("g0", G0),
60 REG_OFFSET_NAME("g1", G1),
61 REG_OFFSET_NAME("g2", G2),
62 REG_OFFSET_NAME("g3", G3),
63 REG_OFFSET_NAME("g4", G4),
64 REG_OFFSET_NAME("g5", G5),
65 REG_OFFSET_NAME("g6", G6),
66 REG_OFFSET_NAME("g7", G7),
67
68 REG_OFFSET_NAME("i0", I0),
69 REG_OFFSET_NAME("i1", I1),
70 REG_OFFSET_NAME("i2", I2),
71 REG_OFFSET_NAME("i3", I3),
72 REG_OFFSET_NAME("i4", I4),
73 REG_OFFSET_NAME("i5", I5),
74 REG_OFFSET_NAME("i6", I6),
75 REG_OFFSET_NAME("i7", I7),
76
77 REG_OFFSET_NAME("tstate", TSTATE),
78 REG_OFFSET_NAME("pc", TPC),
79 REG_OFFSET_NAME("npc", TNPC),
80 REG_OFFSET_NAME("y", Y),
81 REG_OFFSET_NAME("lr", I7),
82
83 REG_OFFSET_END,
84};
85
86/*
87 * Called by kernel/ptrace.c when detaching..
88 *
89 * Make sure single step bits etc are not set.
90 */
91void ptrace_disable(struct task_struct *child)
92{
93 /* nothing to do */
94}
95
96/* To get the necessary page struct, access_process_vm() first calls
97 * get_user_pages(). This has done a flush_dcache_page() on the
98 * accessed page. Then our caller (copy_{to,from}_user_page()) did
99 * to memcpy to read/write the data from that page.
100 *
101 * Now, the only thing we have to do is:
102 * 1) flush the D-cache if it's possible than an illegal alias
103 * has been created
104 * 2) flush the I-cache if this is pre-cheetah and we did a write
105 */
106void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
107 unsigned long uaddr, void *kaddr,
108 unsigned long len, int write)
109{
110 BUG_ON(len > PAGE_SIZE);
111
112 if (tlb_type == hypervisor)
113 return;
114
115 preempt_disable();
116
117#ifdef DCACHE_ALIASING_POSSIBLE
118 /* If bit 13 of the kernel address we used to access the
119 * user page is the same as the virtual address that page
120 * is mapped to in the user's address space, we can skip the
121 * D-cache flush.
122 */
123 if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
124 unsigned long start = __pa(kaddr);
125 unsigned long end = start + len;
126 unsigned long dcache_line_size;
127
128 dcache_line_size = local_cpu_data().dcache_line_size;
129
130 if (tlb_type == spitfire) {
131 for (; start < end; start += dcache_line_size)
132 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
133 } else {
134 start &= ~(dcache_line_size - 1);
135 for (; start < end; start += dcache_line_size)
136 __asm__ __volatile__(
137 "stxa %%g0, [%0] %1\n\t"
138 "membar #Sync"
139 : /* no outputs */
140 : "r" (start),
141 "i" (ASI_DCACHE_INVALIDATE));
142 }
143 }
144#endif
145 if (write && tlb_type == spitfire) {
146 unsigned long start = (unsigned long) kaddr;
147 unsigned long end = start + len;
148 unsigned long icache_line_size;
149
150 icache_line_size = local_cpu_data().icache_line_size;
151
152 for (; start < end; start += icache_line_size)
153 flushi(start);
154 }
155
156 preempt_enable();
157}
158EXPORT_SYMBOL_GPL(flush_ptrace_access);
159
160static int get_from_target(struct task_struct *target, unsigned long uaddr,
161 void *kbuf, int len)
162{
163 if (target == current) {
164 if (copy_from_user(kbuf, (void __user *) uaddr, len))
165 return -EFAULT;
166 } else {
167 int len2 = access_process_vm(target, uaddr, kbuf, len,
168 FOLL_FORCE);
169 if (len2 != len)
170 return -EFAULT;
171 }
172 return 0;
173}
174
175static int set_to_target(struct task_struct *target, unsigned long uaddr,
176 void *kbuf, int len)
177{
178 if (target == current) {
179 if (copy_to_user((void __user *) uaddr, kbuf, len))
180 return -EFAULT;
181 } else {
182 int len2 = access_process_vm(target, uaddr, kbuf, len,
183 FOLL_FORCE | FOLL_WRITE);
184 if (len2 != len)
185 return -EFAULT;
186 }
187 return 0;
188}
189
190static int regwindow64_get(struct task_struct *target,
191 const struct pt_regs *regs,
192 struct reg_window *wbuf)
193{
194 unsigned long rw_addr = regs->u_regs[UREG_I6];
195
196 if (!test_thread_64bit_stack(rw_addr)) {
197 struct reg_window32 win32;
198 int i;
199
200 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
201 return -EFAULT;
202 for (i = 0; i < 8; i++)
203 wbuf->locals[i] = win32.locals[i];
204 for (i = 0; i < 8; i++)
205 wbuf->ins[i] = win32.ins[i];
206 } else {
207 rw_addr += STACK_BIAS;
208 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
209 return -EFAULT;
210 }
211
212 return 0;
213}
214
215static int regwindow64_set(struct task_struct *target,
216 const struct pt_regs *regs,
217 struct reg_window *wbuf)
218{
219 unsigned long rw_addr = regs->u_regs[UREG_I6];
220
221 if (!test_thread_64bit_stack(rw_addr)) {
222 struct reg_window32 win32;
223 int i;
224
225 for (i = 0; i < 8; i++)
226 win32.locals[i] = wbuf->locals[i];
227 for (i = 0; i < 8; i++)
228 win32.ins[i] = wbuf->ins[i];
229
230 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
231 return -EFAULT;
232 } else {
233 rw_addr += STACK_BIAS;
234 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
235 return -EFAULT;
236 }
237
238 return 0;
239}
240
241enum sparc_regset {
242 REGSET_GENERAL,
243 REGSET_FP,
244};
245
246static int genregs64_get(struct task_struct *target,
247 const struct user_regset *regset,
248 struct membuf to)
249{
250 const struct pt_regs *regs = task_pt_regs(target);
251 struct reg_window window;
252
253 if (target == current)
254 flushw_user();
255
256 membuf_write(&to, regs->u_regs, 16 * sizeof(u64));
257 if (!to.left)
258 return 0;
259 if (regwindow64_get(target, regs, &window))
260 return -EFAULT;
261 membuf_write(&to, &window, 16 * sizeof(u64));
262 /* TSTATE, TPC, TNPC */
263 membuf_write(&to, ®s->tstate, 3 * sizeof(u64));
264 return membuf_store(&to, (u64)regs->y);
265}
266
267static int genregs64_set(struct task_struct *target,
268 const struct user_regset *regset,
269 unsigned int pos, unsigned int count,
270 const void *kbuf, const void __user *ubuf)
271{
272 struct pt_regs *regs = task_pt_regs(target);
273 int ret;
274
275 if (target == current)
276 flushw_user();
277
278 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
279 regs->u_regs,
280 0, 16 * sizeof(u64));
281 if (!ret && count && pos < (32 * sizeof(u64))) {
282 struct reg_window window;
283
284 if (regwindow64_get(target, regs, &window))
285 return -EFAULT;
286
287 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
288 &window,
289 16 * sizeof(u64),
290 32 * sizeof(u64));
291
292 if (!ret &&
293 regwindow64_set(target, regs, &window))
294 return -EFAULT;
295 }
296
297 if (!ret && count > 0) {
298 unsigned long tstate;
299
300 /* TSTATE */
301 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
302 &tstate,
303 32 * sizeof(u64),
304 33 * sizeof(u64));
305 if (!ret) {
306 /* Only the condition codes and the "in syscall"
307 * state can be modified in the %tstate register.
308 */
309 tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
310 regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
311 regs->tstate |= tstate;
312 }
313 }
314
315 if (!ret) {
316 /* TPC, TNPC */
317 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
318 ®s->tpc,
319 33 * sizeof(u64),
320 35 * sizeof(u64));
321 }
322
323 if (!ret) {
324 unsigned long y = regs->y;
325
326 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
327 &y,
328 35 * sizeof(u64),
329 36 * sizeof(u64));
330 if (!ret)
331 regs->y = y;
332 }
333
334 if (!ret)
335 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
336 36 * sizeof(u64), -1);
337
338 return ret;
339}
340
341static int fpregs64_get(struct task_struct *target,
342 const struct user_regset *regset,
343 struct membuf to)
344{
345 struct thread_info *t = task_thread_info(target);
346 unsigned long fprs;
347
348 if (target == current)
349 save_and_clear_fpu();
350
351 fprs = t->fpsaved[0];
352
353 if (fprs & FPRS_DL)
354 membuf_write(&to, t->fpregs, 16 * sizeof(u64));
355 else
356 membuf_zero(&to, 16 * sizeof(u64));
357
358 if (fprs & FPRS_DU)
359 membuf_write(&to, t->fpregs + 16, 16 * sizeof(u64));
360 else
361 membuf_zero(&to, 16 * sizeof(u64));
362 if (fprs & FPRS_FEF) {
363 membuf_store(&to, t->xfsr[0]);
364 membuf_store(&to, t->gsr[0]);
365 } else {
366 membuf_zero(&to, 2 * sizeof(u64));
367 }
368 return membuf_store(&to, fprs);
369}
370
371static int fpregs64_set(struct task_struct *target,
372 const struct user_regset *regset,
373 unsigned int pos, unsigned int count,
374 const void *kbuf, const void __user *ubuf)
375{
376 unsigned long *fpregs = task_thread_info(target)->fpregs;
377 unsigned long fprs;
378 int ret;
379
380 if (target == current)
381 save_and_clear_fpu();
382
383 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
384 fpregs,
385 0, 32 * sizeof(u64));
386 if (!ret)
387 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
388 task_thread_info(target)->xfsr,
389 32 * sizeof(u64),
390 33 * sizeof(u64));
391 if (!ret)
392 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
393 task_thread_info(target)->gsr,
394 33 * sizeof(u64),
395 34 * sizeof(u64));
396
397 fprs = task_thread_info(target)->fpsaved[0];
398 if (!ret && count > 0) {
399 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
400 &fprs,
401 34 * sizeof(u64),
402 35 * sizeof(u64));
403 }
404
405 fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
406 task_thread_info(target)->fpsaved[0] = fprs;
407
408 if (!ret)
409 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
410 35 * sizeof(u64), -1);
411 return ret;
412}
413
414static const struct user_regset sparc64_regsets[] = {
415 /* Format is:
416 * G0 --> G7
417 * O0 --> O7
418 * L0 --> L7
419 * I0 --> I7
420 * TSTATE, TPC, TNPC, Y
421 */
422 [REGSET_GENERAL] = {
423 .core_note_type = NT_PRSTATUS,
424 .n = 36,
425 .size = sizeof(u64), .align = sizeof(u64),
426 .regset_get = genregs64_get, .set = genregs64_set
427 },
428 /* Format is:
429 * F0 --> F63
430 * FSR
431 * GSR
432 * FPRS
433 */
434 [REGSET_FP] = {
435 .core_note_type = NT_PRFPREG,
436 .n = 35,
437 .size = sizeof(u64), .align = sizeof(u64),
438 .regset_get = fpregs64_get, .set = fpregs64_set
439 },
440};
441
442static int getregs64_get(struct task_struct *target,
443 const struct user_regset *regset,
444 struct membuf to)
445{
446 const struct pt_regs *regs = task_pt_regs(target);
447
448 if (target == current)
449 flushw_user();
450
451 membuf_write(&to, regs->u_regs + 1, 15 * sizeof(u64));
452 membuf_store(&to, (u64)0);
453 membuf_write(&to, ®s->tstate, 3 * sizeof(u64));
454 return membuf_store(&to, (u64)regs->y);
455}
456
457static int setregs64_set(struct task_struct *target,
458 const struct user_regset *regset,
459 unsigned int pos, unsigned int count,
460 const void *kbuf, const void __user *ubuf)
461{
462 struct pt_regs *regs = task_pt_regs(target);
463 unsigned long y = regs->y;
464 unsigned long tstate;
465 int ret;
466
467 if (target == current)
468 flushw_user();
469
470 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
471 regs->u_regs + 1,
472 0 * sizeof(u64),
473 15 * sizeof(u64));
474 if (ret)
475 return ret;
476 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
477 15 * sizeof(u64), 16 * sizeof(u64));
478 /* TSTATE */
479 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
480 &tstate,
481 16 * sizeof(u64),
482 17 * sizeof(u64));
483 if (ret)
484 return ret;
485 /* Only the condition codes and the "in syscall"
486 * state can be modified in the %tstate register.
487 */
488 tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
489 regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
490 regs->tstate |= tstate;
491
492 /* TPC, TNPC */
493 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
494 ®s->tpc,
495 17 * sizeof(u64),
496 19 * sizeof(u64));
497 if (ret)
498 return ret;
499 /* Y */
500 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
501 &y,
502 19 * sizeof(u64),
503 20 * sizeof(u64));
504 if (!ret)
505 regs->y = y;
506 return ret;
507}
508
509static const struct user_regset ptrace64_regsets[] = {
510 /* Format is:
511 * G1 --> G7
512 * O0 --> O7
513 * 0
514 * TSTATE, TPC, TNPC, Y
515 */
516 [REGSET_GENERAL] = {
517 .n = 20, .size = sizeof(u64),
518 .regset_get = getregs64_get, .set = setregs64_set,
519 },
520};
521
522static const struct user_regset_view ptrace64_view = {
523 .regsets = ptrace64_regsets, .n = ARRAY_SIZE(ptrace64_regsets)
524};
525
526static const struct user_regset_view user_sparc64_view = {
527 .name = "sparc64", .e_machine = EM_SPARCV9,
528 .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
529};
530
531#ifdef CONFIG_COMPAT
532static int genregs32_get(struct task_struct *target,
533 const struct user_regset *regset,
534 struct membuf to)
535{
536 const struct pt_regs *regs = task_pt_regs(target);
537 u32 uregs[16];
538 int i;
539
540 if (target == current)
541 flushw_user();
542
543 for (i = 0; i < 16; i++)
544 membuf_store(&to, (u32)regs->u_regs[i]);
545 if (!to.left)
546 return 0;
547 if (get_from_target(target, regs->u_regs[UREG_I6],
548 uregs, sizeof(uregs)))
549 return -EFAULT;
550 membuf_write(&to, uregs, 16 * sizeof(u32));
551 membuf_store(&to, (u32)tstate_to_psr(regs->tstate));
552 membuf_store(&to, (u32)(regs->tpc));
553 membuf_store(&to, (u32)(regs->tnpc));
554 membuf_store(&to, (u32)(regs->y));
555 return membuf_zero(&to, 2 * sizeof(u32));
556}
557
558static int genregs32_set(struct task_struct *target,
559 const struct user_regset *regset,
560 unsigned int pos, unsigned int count,
561 const void *kbuf, const void __user *ubuf)
562{
563 struct pt_regs *regs = task_pt_regs(target);
564 compat_ulong_t __user *reg_window;
565 const compat_ulong_t *k = kbuf;
566 const compat_ulong_t __user *u = ubuf;
567 compat_ulong_t reg;
568
569 if (target == current)
570 flushw_user();
571
572 pos /= sizeof(reg);
573 count /= sizeof(reg);
574
575 if (kbuf) {
576 for (; count > 0 && pos < 16; count--)
577 regs->u_regs[pos++] = *k++;
578
579 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
580 reg_window -= 16;
581 if (target == current) {
582 for (; count > 0 && pos < 32; count--) {
583 if (put_user(*k++, ®_window[pos++]))
584 return -EFAULT;
585 }
586 } else {
587 for (; count > 0 && pos < 32; count--) {
588 if (access_process_vm(target,
589 (unsigned long)
590 ®_window[pos],
591 (void *) k,
592 sizeof(*k),
593 FOLL_FORCE | FOLL_WRITE)
594 != sizeof(*k))
595 return -EFAULT;
596 k++;
597 pos++;
598 }
599 }
600 } else {
601 for (; count > 0 && pos < 16; count--) {
602 if (get_user(reg, u++))
603 return -EFAULT;
604 regs->u_regs[pos++] = reg;
605 }
606
607 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
608 reg_window -= 16;
609 if (target == current) {
610 for (; count > 0 && pos < 32; count--) {
611 if (get_user(reg, u++) ||
612 put_user(reg, ®_window[pos++]))
613 return -EFAULT;
614 }
615 } else {
616 for (; count > 0 && pos < 32; count--) {
617 if (get_user(reg, u++))
618 return -EFAULT;
619 if (access_process_vm(target,
620 (unsigned long)
621 ®_window[pos],
622 ®, sizeof(reg),
623 FOLL_FORCE | FOLL_WRITE)
624 != sizeof(reg))
625 return -EFAULT;
626 pos++;
627 u++;
628 }
629 }
630 }
631 while (count > 0) {
632 unsigned long tstate;
633
634 if (kbuf)
635 reg = *k++;
636 else if (get_user(reg, u++))
637 return -EFAULT;
638
639 switch (pos) {
640 case 32: /* PSR */
641 tstate = regs->tstate;
642 tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
643 tstate |= psr_to_tstate_icc(reg);
644 if (reg & PSR_SYSCALL)
645 tstate |= TSTATE_SYSCALL;
646 regs->tstate = tstate;
647 break;
648 case 33: /* PC */
649 regs->tpc = reg;
650 break;
651 case 34: /* NPC */
652 regs->tnpc = reg;
653 break;
654 case 35: /* Y */
655 regs->y = reg;
656 break;
657 case 36: /* WIM */
658 case 37: /* TBR */
659 break;
660 default:
661 goto finish;
662 }
663
664 pos++;
665 count--;
666 }
667finish:
668 pos *= sizeof(reg);
669 count *= sizeof(reg);
670
671 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
672 38 * sizeof(reg), -1);
673 return 0;
674}
675
676static int fpregs32_get(struct task_struct *target,
677 const struct user_regset *regset,
678 struct membuf to)
679{
680 struct thread_info *t = task_thread_info(target);
681 bool enabled;
682
683 if (target == current)
684 save_and_clear_fpu();
685
686 enabled = t->fpsaved[0] & FPRS_FEF;
687
688 membuf_write(&to, t->fpregs, 32 * sizeof(u32));
689 membuf_zero(&to, sizeof(u32));
690 if (enabled)
691 membuf_store(&to, (u32)t->xfsr[0]);
692 else
693 membuf_zero(&to, sizeof(u32));
694 membuf_store(&to, (u32)((enabled << 8) | (8 << 16)));
695 return membuf_zero(&to, 64 * sizeof(u32));
696}
697
698static int fpregs32_set(struct task_struct *target,
699 const struct user_regset *regset,
700 unsigned int pos, unsigned int count,
701 const void *kbuf, const void __user *ubuf)
702{
703 unsigned long *fpregs = task_thread_info(target)->fpregs;
704 unsigned long fprs;
705 int ret;
706
707 if (target == current)
708 save_and_clear_fpu();
709
710 fprs = task_thread_info(target)->fpsaved[0];
711
712 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
713 fpregs,
714 0, 32 * sizeof(u32));
715 if (!ret)
716 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
717 32 * sizeof(u32),
718 33 * sizeof(u32));
719 if (!ret && count > 0) {
720 compat_ulong_t fsr;
721 unsigned long val;
722
723 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
724 &fsr,
725 33 * sizeof(u32),
726 34 * sizeof(u32));
727 if (!ret) {
728 val = task_thread_info(target)->xfsr[0];
729 val &= 0xffffffff00000000UL;
730 val |= fsr;
731 task_thread_info(target)->xfsr[0] = val;
732 }
733 }
734
735 fprs |= (FPRS_FEF | FPRS_DL);
736 task_thread_info(target)->fpsaved[0] = fprs;
737
738 if (!ret)
739 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
740 34 * sizeof(u32), -1);
741 return ret;
742}
743
744static const struct user_regset sparc32_regsets[] = {
745 /* Format is:
746 * G0 --> G7
747 * O0 --> O7
748 * L0 --> L7
749 * I0 --> I7
750 * PSR, PC, nPC, Y, WIM, TBR
751 */
752 [REGSET_GENERAL] = {
753 .core_note_type = NT_PRSTATUS,
754 .n = 38,
755 .size = sizeof(u32), .align = sizeof(u32),
756 .regset_get = genregs32_get, .set = genregs32_set
757 },
758 /* Format is:
759 * F0 --> F31
760 * empty 32-bit word
761 * FSR (32--bit word)
762 * FPU QUEUE COUNT (8-bit char)
763 * FPU QUEUE ENTRYSIZE (8-bit char)
764 * FPU ENABLED (8-bit char)
765 * empty 8-bit char
766 * FPU QUEUE (64 32-bit ints)
767 */
768 [REGSET_FP] = {
769 .core_note_type = NT_PRFPREG,
770 .n = 99,
771 .size = sizeof(u32), .align = sizeof(u32),
772 .regset_get = fpregs32_get, .set = fpregs32_set
773 },
774};
775
776static int getregs_get(struct task_struct *target,
777 const struct user_regset *regset,
778 struct membuf to)
779{
780 const struct pt_regs *regs = task_pt_regs(target);
781 int i;
782
783 if (target == current)
784 flushw_user();
785
786 membuf_store(&to, (u32)tstate_to_psr(regs->tstate));
787 membuf_store(&to, (u32)(regs->tpc));
788 membuf_store(&to, (u32)(regs->tnpc));
789 membuf_store(&to, (u32)(regs->y));
790 for (i = 1; i < 16; i++)
791 membuf_store(&to, (u32)regs->u_regs[i]);
792 return to.left;
793}
794
795static int setregs_set(struct task_struct *target,
796 const struct user_regset *regset,
797 unsigned int pos, unsigned int count,
798 const void *kbuf, const void __user *ubuf)
799{
800 struct pt_regs *regs = task_pt_regs(target);
801 unsigned long tstate;
802 u32 uregs[19];
803 int i, ret;
804
805 if (target == current)
806 flushw_user();
807
808 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
809 uregs,
810 0, 19 * sizeof(u32));
811 if (ret)
812 return ret;
813
814 tstate = regs->tstate;
815 tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
816 tstate |= psr_to_tstate_icc(uregs[0]);
817 if (uregs[0] & PSR_SYSCALL)
818 tstate |= TSTATE_SYSCALL;
819 regs->tstate = tstate;
820 regs->tpc = uregs[1];
821 regs->tnpc = uregs[2];
822 regs->y = uregs[3];
823
824 for (i = 1; i < 15; i++)
825 regs->u_regs[i] = uregs[3 + i];
826 return 0;
827}
828
829static int getfpregs_get(struct task_struct *target,
830 const struct user_regset *regset,
831 struct membuf to)
832{
833 struct thread_info *t = task_thread_info(target);
834
835 if (target == current)
836 save_and_clear_fpu();
837
838 membuf_write(&to, t->fpregs, 32 * sizeof(u32));
839 if (t->fpsaved[0] & FPRS_FEF)
840 membuf_store(&to, (u32)t->xfsr[0]);
841 else
842 membuf_zero(&to, sizeof(u32));
843 return membuf_zero(&to, 35 * sizeof(u32));
844}
845
846static int setfpregs_set(struct task_struct *target,
847 const struct user_regset *regset,
848 unsigned int pos, unsigned int count,
849 const void *kbuf, const void __user *ubuf)
850{
851 unsigned long *fpregs = task_thread_info(target)->fpregs;
852 unsigned long fprs;
853 int ret;
854
855 if (target == current)
856 save_and_clear_fpu();
857
858 fprs = task_thread_info(target)->fpsaved[0];
859
860 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
861 fpregs,
862 0, 32 * sizeof(u32));
863 if (!ret) {
864 compat_ulong_t fsr;
865 unsigned long val;
866
867 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
868 &fsr,
869 32 * sizeof(u32),
870 33 * sizeof(u32));
871 if (!ret) {
872 val = task_thread_info(target)->xfsr[0];
873 val &= 0xffffffff00000000UL;
874 val |= fsr;
875 task_thread_info(target)->xfsr[0] = val;
876 }
877 }
878
879 fprs |= (FPRS_FEF | FPRS_DL);
880 task_thread_info(target)->fpsaved[0] = fprs;
881 return ret;
882}
883
884static const struct user_regset ptrace32_regsets[] = {
885 [REGSET_GENERAL] = {
886 .n = 19, .size = sizeof(u32),
887 .regset_get = getregs_get, .set = setregs_set,
888 },
889 [REGSET_FP] = {
890 .n = 68, .size = sizeof(u32),
891 .regset_get = getfpregs_get, .set = setfpregs_set,
892 },
893};
894
895static const struct user_regset_view ptrace32_view = {
896 .regsets = ptrace32_regsets, .n = ARRAY_SIZE(ptrace32_regsets)
897};
898
899static const struct user_regset_view user_sparc32_view = {
900 .name = "sparc", .e_machine = EM_SPARC,
901 .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
902};
903#endif /* CONFIG_COMPAT */
904
905const struct user_regset_view *task_user_regset_view(struct task_struct *task)
906{
907#ifdef CONFIG_COMPAT
908 if (test_tsk_thread_flag(task, TIF_32BIT))
909 return &user_sparc32_view;
910#endif
911 return &user_sparc64_view;
912}
913
914#ifdef CONFIG_COMPAT
915struct compat_fps {
916 unsigned int regs[32];
917 unsigned int fsr;
918 unsigned int flags;
919 unsigned int extra;
920 unsigned int fpqd;
921 struct compat_fq {
922 unsigned int insnaddr;
923 unsigned int insn;
924 } fpq[16];
925};
926
927long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
928 compat_ulong_t caddr, compat_ulong_t cdata)
929{
930 compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
931 struct pt_regs32 __user *pregs;
932 struct compat_fps __user *fps;
933 unsigned long addr2 = caddr2;
934 unsigned long addr = caddr;
935 unsigned long data = cdata;
936 int ret;
937
938 pregs = (struct pt_regs32 __user *) addr;
939 fps = (struct compat_fps __user *) addr;
940
941 switch (request) {
942 case PTRACE_PEEKUSR:
943 ret = (addr != 0) ? -EIO : 0;
944 break;
945
946 case PTRACE_GETREGS:
947 ret = copy_regset_to_user(child, &ptrace32_view,
948 REGSET_GENERAL, 0,
949 19 * sizeof(u32),
950 pregs);
951 break;
952
953 case PTRACE_SETREGS:
954 ret = copy_regset_from_user(child, &ptrace32_view,
955 REGSET_GENERAL, 0,
956 19 * sizeof(u32),
957 pregs);
958 break;
959
960 case PTRACE_GETFPREGS:
961 ret = copy_regset_to_user(child, &ptrace32_view,
962 REGSET_FP, 0,
963 68 * sizeof(u32),
964 fps);
965 break;
966
967 case PTRACE_SETFPREGS:
968 ret = copy_regset_from_user(child, &ptrace32_view,
969 REGSET_FP, 0,
970 33 * sizeof(u32),
971 fps);
972 break;
973
974 case PTRACE_READTEXT:
975 case PTRACE_READDATA:
976 ret = ptrace_readdata(child, addr,
977 (char __user *)addr2, data);
978 if (ret == data)
979 ret = 0;
980 else if (ret >= 0)
981 ret = -EIO;
982 break;
983
984 case PTRACE_WRITETEXT:
985 case PTRACE_WRITEDATA:
986 ret = ptrace_writedata(child, (char __user *) addr2,
987 addr, data);
988 if (ret == data)
989 ret = 0;
990 else if (ret >= 0)
991 ret = -EIO;
992 break;
993
994 default:
995 if (request == PTRACE_SPARC_DETACH)
996 request = PTRACE_DETACH;
997 ret = compat_ptrace_request(child, request, addr, data);
998 break;
999 }
1000
1001 return ret;
1002}
1003#endif /* CONFIG_COMPAT */
1004
1005struct fps {
1006 unsigned int regs[64];
1007 unsigned long fsr;
1008};
1009
1010long arch_ptrace(struct task_struct *child, long request,
1011 unsigned long addr, unsigned long data)
1012{
1013 const struct user_regset_view *view = task_user_regset_view(current);
1014 unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
1015 struct pt_regs __user *pregs;
1016 struct fps __user *fps;
1017 void __user *addr2p;
1018 int ret;
1019
1020 pregs = (struct pt_regs __user *) addr;
1021 fps = (struct fps __user *) addr;
1022 addr2p = (void __user *) addr2;
1023
1024 switch (request) {
1025 case PTRACE_PEEKUSR:
1026 ret = (addr != 0) ? -EIO : 0;
1027 break;
1028
1029 case PTRACE_GETREGS64:
1030 ret = copy_regset_to_user(child, &ptrace64_view,
1031 REGSET_GENERAL, 0,
1032 19 * sizeof(u64),
1033 pregs);
1034 break;
1035
1036 case PTRACE_SETREGS64:
1037 ret = copy_regset_from_user(child, &ptrace64_view,
1038 REGSET_GENERAL, 0,
1039 19 * sizeof(u64),
1040 pregs);
1041 break;
1042
1043 case PTRACE_GETFPREGS64:
1044 ret = copy_regset_to_user(child, view, REGSET_FP,
1045 0 * sizeof(u64),
1046 33 * sizeof(u64),
1047 fps);
1048 break;
1049
1050 case PTRACE_SETFPREGS64:
1051 ret = copy_regset_from_user(child, view, REGSET_FP,
1052 0 * sizeof(u64),
1053 33 * sizeof(u64),
1054 fps);
1055 break;
1056
1057 case PTRACE_READTEXT:
1058 case PTRACE_READDATA:
1059 ret = ptrace_readdata(child, addr, addr2p, data);
1060 if (ret == data)
1061 ret = 0;
1062 else if (ret >= 0)
1063 ret = -EIO;
1064 break;
1065
1066 case PTRACE_WRITETEXT:
1067 case PTRACE_WRITEDATA:
1068 ret = ptrace_writedata(child, addr2p, addr, data);
1069 if (ret == data)
1070 ret = 0;
1071 else if (ret >= 0)
1072 ret = -EIO;
1073 break;
1074
1075 default:
1076 if (request == PTRACE_SPARC_DETACH)
1077 request = PTRACE_DETACH;
1078 ret = ptrace_request(child, request, addr, data);
1079 break;
1080 }
1081
1082 return ret;
1083}
1084
1085asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1086{
1087 int ret = 0;
1088
1089 /* do the secure computing check first */
1090 secure_computing_strict(regs->u_regs[UREG_G1]);
1091
1092 if (test_thread_flag(TIF_NOHZ))
1093 user_exit();
1094
1095 if (test_thread_flag(TIF_SYSCALL_TRACE))
1096 ret = ptrace_report_syscall_entry(regs);
1097
1098 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1099 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1100
1101 audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
1102 regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
1103 regs->u_regs[UREG_I3]);
1104
1105 return ret;
1106}
1107
1108asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1109{
1110 if (test_thread_flag(TIF_NOHZ))
1111 user_exit();
1112
1113 audit_syscall_exit(regs);
1114
1115 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1116 trace_sys_exit(regs, regs->u_regs[UREG_I0]);
1117
1118 if (test_thread_flag(TIF_SYSCALL_TRACE))
1119 ptrace_report_syscall_exit(regs, 0);
1120
1121 if (test_thread_flag(TIF_NOHZ))
1122 user_enter();
1123}
1124
1125/**
1126 * regs_query_register_offset() - query register offset from its name
1127 * @name: the name of a register
1128 *
1129 * regs_query_register_offset() returns the offset of a register in struct
1130 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
1131 */
1132int regs_query_register_offset(const char *name)
1133{
1134 const struct pt_regs_offset *roff;
1135
1136 for (roff = regoffset_table; roff->name != NULL; roff++)
1137 if (!strcmp(roff->name, name))
1138 return roff->offset;
1139 return -EINVAL;
1140}
1141
1142/**
1143 * regs_within_kernel_stack() - check the address in the stack
1144 * @regs: pt_regs which contains kernel stack pointer.
1145 * @addr: address which is checked.
1146 *
1147 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
1148 * If @addr is within the kernel stack, it returns true. If not, returns false.
1149 */
1150static inline int regs_within_kernel_stack(struct pt_regs *regs,
1151 unsigned long addr)
1152{
1153 unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;
1154 return ((addr & ~(THREAD_SIZE - 1)) ==
1155 (ksp & ~(THREAD_SIZE - 1)));
1156}
1157
1158/**
1159 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1160 * @regs: pt_regs which contains kernel stack pointer.
1161 * @n: stack entry number.
1162 *
1163 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1164 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
1165 * this returns 0.
1166 */
1167unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1168{
1169 unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;
1170 unsigned long *addr = (unsigned long *)ksp;
1171 addr += n;
1172 if (regs_within_kernel_stack(regs, (unsigned long)addr))
1173 return *addr;
1174 else
1175 return 0;
1176}
1/* ptrace.c: Sparc process tracing support.
2 *
3 * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 *
6 * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
7 * and David Mosberger.
8 *
9 * Added Linux support -miguel (weird, eh?, the original code was meant
10 * to emulate SunOS).
11 */
12
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/errno.h>
17#include <linux/export.h>
18#include <linux/ptrace.h>
19#include <linux/user.h>
20#include <linux/smp.h>
21#include <linux/security.h>
22#include <linux/seccomp.h>
23#include <linux/audit.h>
24#include <linux/signal.h>
25#include <linux/regset.h>
26#include <linux/tracehook.h>
27#include <trace/syscall.h>
28#include <linux/compat.h>
29#include <linux/elf.h>
30#include <linux/context_tracking.h>
31
32#include <asm/asi.h>
33#include <asm/pgtable.h>
34#include <asm/uaccess.h>
35#include <asm/psrcompat.h>
36#include <asm/visasm.h>
37#include <asm/spitfire.h>
38#include <asm/page.h>
39#include <asm/cpudata.h>
40#include <asm/cacheflush.h>
41
42#define CREATE_TRACE_POINTS
43#include <trace/events/syscalls.h>
44
45#include "entry.h"
46
47/* #define ALLOW_INIT_TRACING */
48
49/*
50 * Called by kernel/ptrace.c when detaching..
51 *
52 * Make sure single step bits etc are not set.
53 */
54void ptrace_disable(struct task_struct *child)
55{
56 /* nothing to do */
57}
58
59/* To get the necessary page struct, access_process_vm() first calls
60 * get_user_pages(). This has done a flush_dcache_page() on the
61 * accessed page. Then our caller (copy_{to,from}_user_page()) did
62 * to memcpy to read/write the data from that page.
63 *
64 * Now, the only thing we have to do is:
65 * 1) flush the D-cache if it's possible than an illegal alias
66 * has been created
67 * 2) flush the I-cache if this is pre-cheetah and we did a write
68 */
69void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
70 unsigned long uaddr, void *kaddr,
71 unsigned long len, int write)
72{
73 BUG_ON(len > PAGE_SIZE);
74
75 if (tlb_type == hypervisor)
76 return;
77
78 preempt_disable();
79
80#ifdef DCACHE_ALIASING_POSSIBLE
81 /* If bit 13 of the kernel address we used to access the
82 * user page is the same as the virtual address that page
83 * is mapped to in the user's address space, we can skip the
84 * D-cache flush.
85 */
86 if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
87 unsigned long start = __pa(kaddr);
88 unsigned long end = start + len;
89 unsigned long dcache_line_size;
90
91 dcache_line_size = local_cpu_data().dcache_line_size;
92
93 if (tlb_type == spitfire) {
94 for (; start < end; start += dcache_line_size)
95 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
96 } else {
97 start &= ~(dcache_line_size - 1);
98 for (; start < end; start += dcache_line_size)
99 __asm__ __volatile__(
100 "stxa %%g0, [%0] %1\n\t"
101 "membar #Sync"
102 : /* no outputs */
103 : "r" (start),
104 "i" (ASI_DCACHE_INVALIDATE));
105 }
106 }
107#endif
108 if (write && tlb_type == spitfire) {
109 unsigned long start = (unsigned long) kaddr;
110 unsigned long end = start + len;
111 unsigned long icache_line_size;
112
113 icache_line_size = local_cpu_data().icache_line_size;
114
115 for (; start < end; start += icache_line_size)
116 flushi(start);
117 }
118
119 preempt_enable();
120}
121EXPORT_SYMBOL_GPL(flush_ptrace_access);
122
123static int get_from_target(struct task_struct *target, unsigned long uaddr,
124 void *kbuf, int len)
125{
126 if (target == current) {
127 if (copy_from_user(kbuf, (void __user *) uaddr, len))
128 return -EFAULT;
129 } else {
130 int len2 = access_process_vm(target, uaddr, kbuf, len, 0);
131 if (len2 != len)
132 return -EFAULT;
133 }
134 return 0;
135}
136
137static int set_to_target(struct task_struct *target, unsigned long uaddr,
138 void *kbuf, int len)
139{
140 if (target == current) {
141 if (copy_to_user((void __user *) uaddr, kbuf, len))
142 return -EFAULT;
143 } else {
144 int len2 = access_process_vm(target, uaddr, kbuf, len, 1);
145 if (len2 != len)
146 return -EFAULT;
147 }
148 return 0;
149}
150
151static int regwindow64_get(struct task_struct *target,
152 const struct pt_regs *regs,
153 struct reg_window *wbuf)
154{
155 unsigned long rw_addr = regs->u_regs[UREG_I6];
156
157 if (!test_thread_64bit_stack(rw_addr)) {
158 struct reg_window32 win32;
159 int i;
160
161 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
162 return -EFAULT;
163 for (i = 0; i < 8; i++)
164 wbuf->locals[i] = win32.locals[i];
165 for (i = 0; i < 8; i++)
166 wbuf->ins[i] = win32.ins[i];
167 } else {
168 rw_addr += STACK_BIAS;
169 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
170 return -EFAULT;
171 }
172
173 return 0;
174}
175
176static int regwindow64_set(struct task_struct *target,
177 const struct pt_regs *regs,
178 struct reg_window *wbuf)
179{
180 unsigned long rw_addr = regs->u_regs[UREG_I6];
181
182 if (!test_thread_64bit_stack(rw_addr)) {
183 struct reg_window32 win32;
184 int i;
185
186 for (i = 0; i < 8; i++)
187 win32.locals[i] = wbuf->locals[i];
188 for (i = 0; i < 8; i++)
189 win32.ins[i] = wbuf->ins[i];
190
191 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
192 return -EFAULT;
193 } else {
194 rw_addr += STACK_BIAS;
195 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
196 return -EFAULT;
197 }
198
199 return 0;
200}
201
202enum sparc_regset {
203 REGSET_GENERAL,
204 REGSET_FP,
205};
206
207static int genregs64_get(struct task_struct *target,
208 const struct user_regset *regset,
209 unsigned int pos, unsigned int count,
210 void *kbuf, void __user *ubuf)
211{
212 const struct pt_regs *regs = task_pt_regs(target);
213 int ret;
214
215 if (target == current)
216 flushw_user();
217
218 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
219 regs->u_regs,
220 0, 16 * sizeof(u64));
221 if (!ret && count && pos < (32 * sizeof(u64))) {
222 struct reg_window window;
223
224 if (regwindow64_get(target, regs, &window))
225 return -EFAULT;
226 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
227 &window,
228 16 * sizeof(u64),
229 32 * sizeof(u64));
230 }
231
232 if (!ret) {
233 /* TSTATE, TPC, TNPC */
234 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
235 ®s->tstate,
236 32 * sizeof(u64),
237 35 * sizeof(u64));
238 }
239
240 if (!ret) {
241 unsigned long y = regs->y;
242
243 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
244 &y,
245 35 * sizeof(u64),
246 36 * sizeof(u64));
247 }
248
249 if (!ret) {
250 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
251 36 * sizeof(u64), -1);
252
253 }
254 return ret;
255}
256
257static int genregs64_set(struct task_struct *target,
258 const struct user_regset *regset,
259 unsigned int pos, unsigned int count,
260 const void *kbuf, const void __user *ubuf)
261{
262 struct pt_regs *regs = task_pt_regs(target);
263 int ret;
264
265 if (target == current)
266 flushw_user();
267
268 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
269 regs->u_regs,
270 0, 16 * sizeof(u64));
271 if (!ret && count && pos < (32 * sizeof(u64))) {
272 struct reg_window window;
273
274 if (regwindow64_get(target, regs, &window))
275 return -EFAULT;
276
277 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
278 &window,
279 16 * sizeof(u64),
280 32 * sizeof(u64));
281
282 if (!ret &&
283 regwindow64_set(target, regs, &window))
284 return -EFAULT;
285 }
286
287 if (!ret && count > 0) {
288 unsigned long tstate;
289
290 /* TSTATE */
291 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
292 &tstate,
293 32 * sizeof(u64),
294 33 * sizeof(u64));
295 if (!ret) {
296 /* Only the condition codes and the "in syscall"
297 * state can be modified in the %tstate register.
298 */
299 tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
300 regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
301 regs->tstate |= tstate;
302 }
303 }
304
305 if (!ret) {
306 /* TPC, TNPC */
307 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
308 ®s->tpc,
309 33 * sizeof(u64),
310 35 * sizeof(u64));
311 }
312
313 if (!ret) {
314 unsigned long y;
315
316 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
317 &y,
318 35 * sizeof(u64),
319 36 * sizeof(u64));
320 if (!ret)
321 regs->y = y;
322 }
323
324 if (!ret)
325 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
326 36 * sizeof(u64), -1);
327
328 return ret;
329}
330
331static int fpregs64_get(struct task_struct *target,
332 const struct user_regset *regset,
333 unsigned int pos, unsigned int count,
334 void *kbuf, void __user *ubuf)
335{
336 const unsigned long *fpregs = task_thread_info(target)->fpregs;
337 unsigned long fprs, fsr, gsr;
338 int ret;
339
340 if (target == current)
341 save_and_clear_fpu();
342
343 fprs = task_thread_info(target)->fpsaved[0];
344
345 if (fprs & FPRS_DL)
346 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
347 fpregs,
348 0, 16 * sizeof(u64));
349 else
350 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
351 0,
352 16 * sizeof(u64));
353
354 if (!ret) {
355 if (fprs & FPRS_DU)
356 ret = user_regset_copyout(&pos, &count,
357 &kbuf, &ubuf,
358 fpregs + 16,
359 16 * sizeof(u64),
360 32 * sizeof(u64));
361 else
362 ret = user_regset_copyout_zero(&pos, &count,
363 &kbuf, &ubuf,
364 16 * sizeof(u64),
365 32 * sizeof(u64));
366 }
367
368 if (fprs & FPRS_FEF) {
369 fsr = task_thread_info(target)->xfsr[0];
370 gsr = task_thread_info(target)->gsr[0];
371 } else {
372 fsr = gsr = 0;
373 }
374
375 if (!ret)
376 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
377 &fsr,
378 32 * sizeof(u64),
379 33 * sizeof(u64));
380 if (!ret)
381 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
382 &gsr,
383 33 * sizeof(u64),
384 34 * sizeof(u64));
385 if (!ret)
386 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
387 &fprs,
388 34 * sizeof(u64),
389 35 * sizeof(u64));
390
391 if (!ret)
392 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
393 35 * sizeof(u64), -1);
394
395 return ret;
396}
397
398static int fpregs64_set(struct task_struct *target,
399 const struct user_regset *regset,
400 unsigned int pos, unsigned int count,
401 const void *kbuf, const void __user *ubuf)
402{
403 unsigned long *fpregs = task_thread_info(target)->fpregs;
404 unsigned long fprs;
405 int ret;
406
407 if (target == current)
408 save_and_clear_fpu();
409
410 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
411 fpregs,
412 0, 32 * sizeof(u64));
413 if (!ret)
414 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
415 task_thread_info(target)->xfsr,
416 32 * sizeof(u64),
417 33 * sizeof(u64));
418 if (!ret)
419 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
420 task_thread_info(target)->gsr,
421 33 * sizeof(u64),
422 34 * sizeof(u64));
423
424 fprs = task_thread_info(target)->fpsaved[0];
425 if (!ret && count > 0) {
426 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
427 &fprs,
428 34 * sizeof(u64),
429 35 * sizeof(u64));
430 }
431
432 fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
433 task_thread_info(target)->fpsaved[0] = fprs;
434
435 if (!ret)
436 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
437 35 * sizeof(u64), -1);
438 return ret;
439}
440
441static const struct user_regset sparc64_regsets[] = {
442 /* Format is:
443 * G0 --> G7
444 * O0 --> O7
445 * L0 --> L7
446 * I0 --> I7
447 * TSTATE, TPC, TNPC, Y
448 */
449 [REGSET_GENERAL] = {
450 .core_note_type = NT_PRSTATUS,
451 .n = 36,
452 .size = sizeof(u64), .align = sizeof(u64),
453 .get = genregs64_get, .set = genregs64_set
454 },
455 /* Format is:
456 * F0 --> F63
457 * FSR
458 * GSR
459 * FPRS
460 */
461 [REGSET_FP] = {
462 .core_note_type = NT_PRFPREG,
463 .n = 35,
464 .size = sizeof(u64), .align = sizeof(u64),
465 .get = fpregs64_get, .set = fpregs64_set
466 },
467};
468
469static const struct user_regset_view user_sparc64_view = {
470 .name = "sparc64", .e_machine = EM_SPARCV9,
471 .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
472};
473
474#ifdef CONFIG_COMPAT
475static int genregs32_get(struct task_struct *target,
476 const struct user_regset *regset,
477 unsigned int pos, unsigned int count,
478 void *kbuf, void __user *ubuf)
479{
480 const struct pt_regs *regs = task_pt_regs(target);
481 compat_ulong_t __user *reg_window;
482 compat_ulong_t *k = kbuf;
483 compat_ulong_t __user *u = ubuf;
484 compat_ulong_t reg;
485
486 if (target == current)
487 flushw_user();
488
489 pos /= sizeof(reg);
490 count /= sizeof(reg);
491
492 if (kbuf) {
493 for (; count > 0 && pos < 16; count--)
494 *k++ = regs->u_regs[pos++];
495
496 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
497 reg_window -= 16;
498 if (target == current) {
499 for (; count > 0 && pos < 32; count--) {
500 if (get_user(*k++, ®_window[pos++]))
501 return -EFAULT;
502 }
503 } else {
504 for (; count > 0 && pos < 32; count--) {
505 if (access_process_vm(target,
506 (unsigned long)
507 ®_window[pos],
508 k, sizeof(*k), 0)
509 != sizeof(*k))
510 return -EFAULT;
511 k++;
512 pos++;
513 }
514 }
515 } else {
516 for (; count > 0 && pos < 16; count--) {
517 if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
518 return -EFAULT;
519 }
520
521 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
522 reg_window -= 16;
523 if (target == current) {
524 for (; count > 0 && pos < 32; count--) {
525 if (get_user(reg, ®_window[pos++]) ||
526 put_user(reg, u++))
527 return -EFAULT;
528 }
529 } else {
530 for (; count > 0 && pos < 32; count--) {
531 if (access_process_vm(target,
532 (unsigned long)
533 ®_window[pos],
534 ®, sizeof(reg), 0)
535 != sizeof(reg))
536 return -EFAULT;
537 if (access_process_vm(target,
538 (unsigned long) u,
539 ®, sizeof(reg), 1)
540 != sizeof(reg))
541 return -EFAULT;
542 pos++;
543 u++;
544 }
545 }
546 }
547 while (count > 0) {
548 switch (pos) {
549 case 32: /* PSR */
550 reg = tstate_to_psr(regs->tstate);
551 break;
552 case 33: /* PC */
553 reg = regs->tpc;
554 break;
555 case 34: /* NPC */
556 reg = regs->tnpc;
557 break;
558 case 35: /* Y */
559 reg = regs->y;
560 break;
561 case 36: /* WIM */
562 case 37: /* TBR */
563 reg = 0;
564 break;
565 default:
566 goto finish;
567 }
568
569 if (kbuf)
570 *k++ = reg;
571 else if (put_user(reg, u++))
572 return -EFAULT;
573 pos++;
574 count--;
575 }
576finish:
577 pos *= sizeof(reg);
578 count *= sizeof(reg);
579
580 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
581 38 * sizeof(reg), -1);
582}
583
584static int genregs32_set(struct task_struct *target,
585 const struct user_regset *regset,
586 unsigned int pos, unsigned int count,
587 const void *kbuf, const void __user *ubuf)
588{
589 struct pt_regs *regs = task_pt_regs(target);
590 compat_ulong_t __user *reg_window;
591 const compat_ulong_t *k = kbuf;
592 const compat_ulong_t __user *u = ubuf;
593 compat_ulong_t reg;
594
595 if (target == current)
596 flushw_user();
597
598 pos /= sizeof(reg);
599 count /= sizeof(reg);
600
601 if (kbuf) {
602 for (; count > 0 && pos < 16; count--)
603 regs->u_regs[pos++] = *k++;
604
605 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
606 reg_window -= 16;
607 if (target == current) {
608 for (; count > 0 && pos < 32; count--) {
609 if (put_user(*k++, ®_window[pos++]))
610 return -EFAULT;
611 }
612 } else {
613 for (; count > 0 && pos < 32; count--) {
614 if (access_process_vm(target,
615 (unsigned long)
616 ®_window[pos],
617 (void *) k,
618 sizeof(*k), 1)
619 != sizeof(*k))
620 return -EFAULT;
621 k++;
622 pos++;
623 }
624 }
625 } else {
626 for (; count > 0 && pos < 16; count--) {
627 if (get_user(reg, u++))
628 return -EFAULT;
629 regs->u_regs[pos++] = reg;
630 }
631
632 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
633 reg_window -= 16;
634 if (target == current) {
635 for (; count > 0 && pos < 32; count--) {
636 if (get_user(reg, u++) ||
637 put_user(reg, ®_window[pos++]))
638 return -EFAULT;
639 }
640 } else {
641 for (; count > 0 && pos < 32; count--) {
642 if (access_process_vm(target,
643 (unsigned long)
644 u,
645 ®, sizeof(reg), 0)
646 != sizeof(reg))
647 return -EFAULT;
648 if (access_process_vm(target,
649 (unsigned long)
650 ®_window[pos],
651 ®, sizeof(reg), 1)
652 != sizeof(reg))
653 return -EFAULT;
654 pos++;
655 u++;
656 }
657 }
658 }
659 while (count > 0) {
660 unsigned long tstate;
661
662 if (kbuf)
663 reg = *k++;
664 else if (get_user(reg, u++))
665 return -EFAULT;
666
667 switch (pos) {
668 case 32: /* PSR */
669 tstate = regs->tstate;
670 tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
671 tstate |= psr_to_tstate_icc(reg);
672 if (reg & PSR_SYSCALL)
673 tstate |= TSTATE_SYSCALL;
674 regs->tstate = tstate;
675 break;
676 case 33: /* PC */
677 regs->tpc = reg;
678 break;
679 case 34: /* NPC */
680 regs->tnpc = reg;
681 break;
682 case 35: /* Y */
683 regs->y = reg;
684 break;
685 case 36: /* WIM */
686 case 37: /* TBR */
687 break;
688 default:
689 goto finish;
690 }
691
692 pos++;
693 count--;
694 }
695finish:
696 pos *= sizeof(reg);
697 count *= sizeof(reg);
698
699 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
700 38 * sizeof(reg), -1);
701}
702
703static int fpregs32_get(struct task_struct *target,
704 const struct user_regset *regset,
705 unsigned int pos, unsigned int count,
706 void *kbuf, void __user *ubuf)
707{
708 const unsigned long *fpregs = task_thread_info(target)->fpregs;
709 compat_ulong_t enabled;
710 unsigned long fprs;
711 compat_ulong_t fsr;
712 int ret = 0;
713
714 if (target == current)
715 save_and_clear_fpu();
716
717 fprs = task_thread_info(target)->fpsaved[0];
718 if (fprs & FPRS_FEF) {
719 fsr = task_thread_info(target)->xfsr[0];
720 enabled = 1;
721 } else {
722 fsr = 0;
723 enabled = 0;
724 }
725
726 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
727 fpregs,
728 0, 32 * sizeof(u32));
729
730 if (!ret)
731 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
732 32 * sizeof(u32),
733 33 * sizeof(u32));
734 if (!ret)
735 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
736 &fsr,
737 33 * sizeof(u32),
738 34 * sizeof(u32));
739
740 if (!ret) {
741 compat_ulong_t val;
742
743 val = (enabled << 8) | (8 << 16);
744 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
745 &val,
746 34 * sizeof(u32),
747 35 * sizeof(u32));
748 }
749
750 if (!ret)
751 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
752 35 * sizeof(u32), -1);
753
754 return ret;
755}
756
757static int fpregs32_set(struct task_struct *target,
758 const struct user_regset *regset,
759 unsigned int pos, unsigned int count,
760 const void *kbuf, const void __user *ubuf)
761{
762 unsigned long *fpregs = task_thread_info(target)->fpregs;
763 unsigned long fprs;
764 int ret;
765
766 if (target == current)
767 save_and_clear_fpu();
768
769 fprs = task_thread_info(target)->fpsaved[0];
770
771 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
772 fpregs,
773 0, 32 * sizeof(u32));
774 if (!ret)
775 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
776 32 * sizeof(u32),
777 33 * sizeof(u32));
778 if (!ret && count > 0) {
779 compat_ulong_t fsr;
780 unsigned long val;
781
782 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
783 &fsr,
784 33 * sizeof(u32),
785 34 * sizeof(u32));
786 if (!ret) {
787 val = task_thread_info(target)->xfsr[0];
788 val &= 0xffffffff00000000UL;
789 val |= fsr;
790 task_thread_info(target)->xfsr[0] = val;
791 }
792 }
793
794 fprs |= (FPRS_FEF | FPRS_DL);
795 task_thread_info(target)->fpsaved[0] = fprs;
796
797 if (!ret)
798 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
799 34 * sizeof(u32), -1);
800 return ret;
801}
802
803static const struct user_regset sparc32_regsets[] = {
804 /* Format is:
805 * G0 --> G7
806 * O0 --> O7
807 * L0 --> L7
808 * I0 --> I7
809 * PSR, PC, nPC, Y, WIM, TBR
810 */
811 [REGSET_GENERAL] = {
812 .core_note_type = NT_PRSTATUS,
813 .n = 38,
814 .size = sizeof(u32), .align = sizeof(u32),
815 .get = genregs32_get, .set = genregs32_set
816 },
817 /* Format is:
818 * F0 --> F31
819 * empty 32-bit word
820 * FSR (32--bit word)
821 * FPU QUEUE COUNT (8-bit char)
822 * FPU QUEUE ENTRYSIZE (8-bit char)
823 * FPU ENABLED (8-bit char)
824 * empty 8-bit char
825 * FPU QUEUE (64 32-bit ints)
826 */
827 [REGSET_FP] = {
828 .core_note_type = NT_PRFPREG,
829 .n = 99,
830 .size = sizeof(u32), .align = sizeof(u32),
831 .get = fpregs32_get, .set = fpregs32_set
832 },
833};
834
835static const struct user_regset_view user_sparc32_view = {
836 .name = "sparc", .e_machine = EM_SPARC,
837 .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
838};
839#endif /* CONFIG_COMPAT */
840
841const struct user_regset_view *task_user_regset_view(struct task_struct *task)
842{
843#ifdef CONFIG_COMPAT
844 if (test_tsk_thread_flag(task, TIF_32BIT))
845 return &user_sparc32_view;
846#endif
847 return &user_sparc64_view;
848}
849
850#ifdef CONFIG_COMPAT
851struct compat_fps {
852 unsigned int regs[32];
853 unsigned int fsr;
854 unsigned int flags;
855 unsigned int extra;
856 unsigned int fpqd;
857 struct compat_fq {
858 unsigned int insnaddr;
859 unsigned int insn;
860 } fpq[16];
861};
862
863long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
864 compat_ulong_t caddr, compat_ulong_t cdata)
865{
866 const struct user_regset_view *view = task_user_regset_view(current);
867 compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
868 struct pt_regs32 __user *pregs;
869 struct compat_fps __user *fps;
870 unsigned long addr2 = caddr2;
871 unsigned long addr = caddr;
872 unsigned long data = cdata;
873 int ret;
874
875 pregs = (struct pt_regs32 __user *) addr;
876 fps = (struct compat_fps __user *) addr;
877
878 switch (request) {
879 case PTRACE_PEEKUSR:
880 ret = (addr != 0) ? -EIO : 0;
881 break;
882
883 case PTRACE_GETREGS:
884 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
885 32 * sizeof(u32),
886 4 * sizeof(u32),
887 &pregs->psr);
888 if (!ret)
889 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
890 1 * sizeof(u32),
891 15 * sizeof(u32),
892 &pregs->u_regs[0]);
893 break;
894
895 case PTRACE_SETREGS:
896 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
897 32 * sizeof(u32),
898 4 * sizeof(u32),
899 &pregs->psr);
900 if (!ret)
901 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
902 1 * sizeof(u32),
903 15 * sizeof(u32),
904 &pregs->u_regs[0]);
905 break;
906
907 case PTRACE_GETFPREGS:
908 ret = copy_regset_to_user(child, view, REGSET_FP,
909 0 * sizeof(u32),
910 32 * sizeof(u32),
911 &fps->regs[0]);
912 if (!ret)
913 ret = copy_regset_to_user(child, view, REGSET_FP,
914 33 * sizeof(u32),
915 1 * sizeof(u32),
916 &fps->fsr);
917 if (!ret) {
918 if (__put_user(0, &fps->flags) ||
919 __put_user(0, &fps->extra) ||
920 __put_user(0, &fps->fpqd) ||
921 clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
922 ret = -EFAULT;
923 }
924 break;
925
926 case PTRACE_SETFPREGS:
927 ret = copy_regset_from_user(child, view, REGSET_FP,
928 0 * sizeof(u32),
929 32 * sizeof(u32),
930 &fps->regs[0]);
931 if (!ret)
932 ret = copy_regset_from_user(child, view, REGSET_FP,
933 33 * sizeof(u32),
934 1 * sizeof(u32),
935 &fps->fsr);
936 break;
937
938 case PTRACE_READTEXT:
939 case PTRACE_READDATA:
940 ret = ptrace_readdata(child, addr,
941 (char __user *)addr2, data);
942 if (ret == data)
943 ret = 0;
944 else if (ret >= 0)
945 ret = -EIO;
946 break;
947
948 case PTRACE_WRITETEXT:
949 case PTRACE_WRITEDATA:
950 ret = ptrace_writedata(child, (char __user *) addr2,
951 addr, data);
952 if (ret == data)
953 ret = 0;
954 else if (ret >= 0)
955 ret = -EIO;
956 break;
957
958 default:
959 if (request == PTRACE_SPARC_DETACH)
960 request = PTRACE_DETACH;
961 ret = compat_ptrace_request(child, request, addr, data);
962 break;
963 }
964
965 return ret;
966}
967#endif /* CONFIG_COMPAT */
968
969struct fps {
970 unsigned int regs[64];
971 unsigned long fsr;
972};
973
974long arch_ptrace(struct task_struct *child, long request,
975 unsigned long addr, unsigned long data)
976{
977 const struct user_regset_view *view = task_user_regset_view(current);
978 unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
979 struct pt_regs __user *pregs;
980 struct fps __user *fps;
981 void __user *addr2p;
982 int ret;
983
984 pregs = (struct pt_regs __user *) addr;
985 fps = (struct fps __user *) addr;
986 addr2p = (void __user *) addr2;
987
988 switch (request) {
989 case PTRACE_PEEKUSR:
990 ret = (addr != 0) ? -EIO : 0;
991 break;
992
993 case PTRACE_GETREGS64:
994 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
995 1 * sizeof(u64),
996 15 * sizeof(u64),
997 &pregs->u_regs[0]);
998 if (!ret) {
999 /* XXX doesn't handle 'y' register correctly XXX */
1000 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1001 32 * sizeof(u64),
1002 4 * sizeof(u64),
1003 &pregs->tstate);
1004 }
1005 break;
1006
1007 case PTRACE_SETREGS64:
1008 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1009 1 * sizeof(u64),
1010 15 * sizeof(u64),
1011 &pregs->u_regs[0]);
1012 if (!ret) {
1013 /* XXX doesn't handle 'y' register correctly XXX */
1014 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1015 32 * sizeof(u64),
1016 4 * sizeof(u64),
1017 &pregs->tstate);
1018 }
1019 break;
1020
1021 case PTRACE_GETFPREGS64:
1022 ret = copy_regset_to_user(child, view, REGSET_FP,
1023 0 * sizeof(u64),
1024 33 * sizeof(u64),
1025 fps);
1026 break;
1027
1028 case PTRACE_SETFPREGS64:
1029 ret = copy_regset_from_user(child, view, REGSET_FP,
1030 0 * sizeof(u64),
1031 33 * sizeof(u64),
1032 fps);
1033 break;
1034
1035 case PTRACE_READTEXT:
1036 case PTRACE_READDATA:
1037 ret = ptrace_readdata(child, addr, addr2p, data);
1038 if (ret == data)
1039 ret = 0;
1040 else if (ret >= 0)
1041 ret = -EIO;
1042 break;
1043
1044 case PTRACE_WRITETEXT:
1045 case PTRACE_WRITEDATA:
1046 ret = ptrace_writedata(child, addr2p, addr, data);
1047 if (ret == data)
1048 ret = 0;
1049 else if (ret >= 0)
1050 ret = -EIO;
1051 break;
1052
1053 default:
1054 if (request == PTRACE_SPARC_DETACH)
1055 request = PTRACE_DETACH;
1056 ret = ptrace_request(child, request, addr, data);
1057 break;
1058 }
1059
1060 return ret;
1061}
1062
1063asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1064{
1065 int ret = 0;
1066
1067 /* do the secure computing check first */
1068 secure_computing_strict(regs->u_regs[UREG_G1]);
1069
1070 if (test_thread_flag(TIF_NOHZ))
1071 user_exit();
1072
1073 if (test_thread_flag(TIF_SYSCALL_TRACE))
1074 ret = tracehook_report_syscall_entry(regs);
1075
1076 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1077 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1078
1079 audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
1080 AUDIT_ARCH_SPARC :
1081 AUDIT_ARCH_SPARC64),
1082 regs->u_regs[UREG_G1],
1083 regs->u_regs[UREG_I0],
1084 regs->u_regs[UREG_I1],
1085 regs->u_regs[UREG_I2],
1086 regs->u_regs[UREG_I3]);
1087
1088 return ret;
1089}
1090
1091asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1092{
1093 if (test_thread_flag(TIF_NOHZ))
1094 user_exit();
1095
1096 audit_syscall_exit(regs);
1097
1098 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1099 trace_sys_exit(regs, regs->u_regs[UREG_I0]);
1100
1101 if (test_thread_flag(TIF_SYSCALL_TRACE))
1102 tracehook_report_syscall_exit(regs, 0);
1103
1104 if (test_thread_flag(TIF_NOHZ))
1105 user_enter();
1106}