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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 <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 unsigned int pos, unsigned int count,
249 void *kbuf, void __user *ubuf)
250{
251 const struct pt_regs *regs = task_pt_regs(target);
252 int ret;
253
254 if (target == current)
255 flushw_user();
256
257 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
258 regs->u_regs,
259 0, 16 * sizeof(u64));
260 if (!ret && count && pos < (32 * sizeof(u64))) {
261 struct reg_window window;
262
263 if (regwindow64_get(target, regs, &window))
264 return -EFAULT;
265 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
266 &window,
267 16 * sizeof(u64),
268 32 * sizeof(u64));
269 }
270
271 if (!ret) {
272 /* TSTATE, TPC, TNPC */
273 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
274 ®s->tstate,
275 32 * sizeof(u64),
276 35 * sizeof(u64));
277 }
278
279 if (!ret) {
280 unsigned long y = regs->y;
281
282 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
283 &y,
284 35 * sizeof(u64),
285 36 * sizeof(u64));
286 }
287
288 if (!ret) {
289 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
290 36 * sizeof(u64), -1);
291
292 }
293 return ret;
294}
295
296static int genregs64_set(struct task_struct *target,
297 const struct user_regset *regset,
298 unsigned int pos, unsigned int count,
299 const void *kbuf, const void __user *ubuf)
300{
301 struct pt_regs *regs = task_pt_regs(target);
302 int ret;
303
304 if (target == current)
305 flushw_user();
306
307 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
308 regs->u_regs,
309 0, 16 * sizeof(u64));
310 if (!ret && count && pos < (32 * sizeof(u64))) {
311 struct reg_window window;
312
313 if (regwindow64_get(target, regs, &window))
314 return -EFAULT;
315
316 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
317 &window,
318 16 * sizeof(u64),
319 32 * sizeof(u64));
320
321 if (!ret &&
322 regwindow64_set(target, regs, &window))
323 return -EFAULT;
324 }
325
326 if (!ret && count > 0) {
327 unsigned long tstate;
328
329 /* TSTATE */
330 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
331 &tstate,
332 32 * sizeof(u64),
333 33 * sizeof(u64));
334 if (!ret) {
335 /* Only the condition codes and the "in syscall"
336 * state can be modified in the %tstate register.
337 */
338 tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
339 regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
340 regs->tstate |= tstate;
341 }
342 }
343
344 if (!ret) {
345 /* TPC, TNPC */
346 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
347 ®s->tpc,
348 33 * sizeof(u64),
349 35 * sizeof(u64));
350 }
351
352 if (!ret) {
353 unsigned long y = regs->y;
354
355 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
356 &y,
357 35 * sizeof(u64),
358 36 * sizeof(u64));
359 if (!ret)
360 regs->y = y;
361 }
362
363 if (!ret)
364 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
365 36 * sizeof(u64), -1);
366
367 return ret;
368}
369
370static int fpregs64_get(struct task_struct *target,
371 const struct user_regset *regset,
372 unsigned int pos, unsigned int count,
373 void *kbuf, void __user *ubuf)
374{
375 const unsigned long *fpregs = task_thread_info(target)->fpregs;
376 unsigned long fprs, fsr, gsr;
377 int ret;
378
379 if (target == current)
380 save_and_clear_fpu();
381
382 fprs = task_thread_info(target)->fpsaved[0];
383
384 if (fprs & FPRS_DL)
385 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
386 fpregs,
387 0, 16 * sizeof(u64));
388 else
389 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
390 0,
391 16 * sizeof(u64));
392
393 if (!ret) {
394 if (fprs & FPRS_DU)
395 ret = user_regset_copyout(&pos, &count,
396 &kbuf, &ubuf,
397 fpregs + 16,
398 16 * sizeof(u64),
399 32 * sizeof(u64));
400 else
401 ret = user_regset_copyout_zero(&pos, &count,
402 &kbuf, &ubuf,
403 16 * sizeof(u64),
404 32 * sizeof(u64));
405 }
406
407 if (fprs & FPRS_FEF) {
408 fsr = task_thread_info(target)->xfsr[0];
409 gsr = task_thread_info(target)->gsr[0];
410 } else {
411 fsr = gsr = 0;
412 }
413
414 if (!ret)
415 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
416 &fsr,
417 32 * sizeof(u64),
418 33 * sizeof(u64));
419 if (!ret)
420 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
421 &gsr,
422 33 * sizeof(u64),
423 34 * sizeof(u64));
424 if (!ret)
425 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
426 &fprs,
427 34 * sizeof(u64),
428 35 * sizeof(u64));
429
430 if (!ret)
431 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
432 35 * sizeof(u64), -1);
433
434 return ret;
435}
436
437static int fpregs64_set(struct task_struct *target,
438 const struct user_regset *regset,
439 unsigned int pos, unsigned int count,
440 const void *kbuf, const void __user *ubuf)
441{
442 unsigned long *fpregs = task_thread_info(target)->fpregs;
443 unsigned long fprs;
444 int ret;
445
446 if (target == current)
447 save_and_clear_fpu();
448
449 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
450 fpregs,
451 0, 32 * sizeof(u64));
452 if (!ret)
453 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
454 task_thread_info(target)->xfsr,
455 32 * sizeof(u64),
456 33 * sizeof(u64));
457 if (!ret)
458 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
459 task_thread_info(target)->gsr,
460 33 * sizeof(u64),
461 34 * sizeof(u64));
462
463 fprs = task_thread_info(target)->fpsaved[0];
464 if (!ret && count > 0) {
465 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
466 &fprs,
467 34 * sizeof(u64),
468 35 * sizeof(u64));
469 }
470
471 fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
472 task_thread_info(target)->fpsaved[0] = fprs;
473
474 if (!ret)
475 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
476 35 * sizeof(u64), -1);
477 return ret;
478}
479
480static const struct user_regset sparc64_regsets[] = {
481 /* Format is:
482 * G0 --> G7
483 * O0 --> O7
484 * L0 --> L7
485 * I0 --> I7
486 * TSTATE, TPC, TNPC, Y
487 */
488 [REGSET_GENERAL] = {
489 .core_note_type = NT_PRSTATUS,
490 .n = 36,
491 .size = sizeof(u64), .align = sizeof(u64),
492 .get = genregs64_get, .set = genregs64_set
493 },
494 /* Format is:
495 * F0 --> F63
496 * FSR
497 * GSR
498 * FPRS
499 */
500 [REGSET_FP] = {
501 .core_note_type = NT_PRFPREG,
502 .n = 35,
503 .size = sizeof(u64), .align = sizeof(u64),
504 .get = fpregs64_get, .set = fpregs64_set
505 },
506};
507
508static const struct user_regset_view user_sparc64_view = {
509 .name = "sparc64", .e_machine = EM_SPARCV9,
510 .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
511};
512
513#ifdef CONFIG_COMPAT
514static int genregs32_get(struct task_struct *target,
515 const struct user_regset *regset,
516 unsigned int pos, unsigned int count,
517 void *kbuf, void __user *ubuf)
518{
519 const struct pt_regs *regs = task_pt_regs(target);
520 compat_ulong_t __user *reg_window;
521 compat_ulong_t *k = kbuf;
522 compat_ulong_t __user *u = ubuf;
523 compat_ulong_t reg;
524
525 if (target == current)
526 flushw_user();
527
528 pos /= sizeof(reg);
529 count /= sizeof(reg);
530
531 if (kbuf) {
532 for (; count > 0 && pos < 16; count--)
533 *k++ = regs->u_regs[pos++];
534
535 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
536 reg_window -= 16;
537 if (target == current) {
538 for (; count > 0 && pos < 32; count--) {
539 if (get_user(*k++, ®_window[pos++]))
540 return -EFAULT;
541 }
542 } else {
543 for (; count > 0 && pos < 32; count--) {
544 if (access_process_vm(target,
545 (unsigned long)
546 ®_window[pos],
547 k, sizeof(*k),
548 FOLL_FORCE)
549 != sizeof(*k))
550 return -EFAULT;
551 k++;
552 pos++;
553 }
554 }
555 } else {
556 for (; count > 0 && pos < 16; count--) {
557 if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
558 return -EFAULT;
559 }
560
561 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
562 reg_window -= 16;
563 if (target == current) {
564 for (; count > 0 && pos < 32; count--) {
565 if (get_user(reg, ®_window[pos++]) ||
566 put_user(reg, u++))
567 return -EFAULT;
568 }
569 } else {
570 for (; count > 0 && pos < 32; count--) {
571 if (access_process_vm(target,
572 (unsigned long)
573 ®_window[pos],
574 ®, sizeof(reg),
575 FOLL_FORCE)
576 != sizeof(reg))
577 return -EFAULT;
578 if (access_process_vm(target,
579 (unsigned long) u,
580 ®, sizeof(reg),
581 FOLL_FORCE | FOLL_WRITE)
582 != sizeof(reg))
583 return -EFAULT;
584 pos++;
585 u++;
586 }
587 }
588 }
589 while (count > 0) {
590 switch (pos) {
591 case 32: /* PSR */
592 reg = tstate_to_psr(regs->tstate);
593 break;
594 case 33: /* PC */
595 reg = regs->tpc;
596 break;
597 case 34: /* NPC */
598 reg = regs->tnpc;
599 break;
600 case 35: /* Y */
601 reg = regs->y;
602 break;
603 case 36: /* WIM */
604 case 37: /* TBR */
605 reg = 0;
606 break;
607 default:
608 goto finish;
609 }
610
611 if (kbuf)
612 *k++ = reg;
613 else if (put_user(reg, u++))
614 return -EFAULT;
615 pos++;
616 count--;
617 }
618finish:
619 pos *= sizeof(reg);
620 count *= sizeof(reg);
621
622 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
623 38 * sizeof(reg), -1);
624}
625
626static int genregs32_set(struct task_struct *target,
627 const struct user_regset *regset,
628 unsigned int pos, unsigned int count,
629 const void *kbuf, const void __user *ubuf)
630{
631 struct pt_regs *regs = task_pt_regs(target);
632 compat_ulong_t __user *reg_window;
633 const compat_ulong_t *k = kbuf;
634 const compat_ulong_t __user *u = ubuf;
635 compat_ulong_t reg;
636
637 if (target == current)
638 flushw_user();
639
640 pos /= sizeof(reg);
641 count /= sizeof(reg);
642
643 if (kbuf) {
644 for (; count > 0 && pos < 16; count--)
645 regs->u_regs[pos++] = *k++;
646
647 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
648 reg_window -= 16;
649 if (target == current) {
650 for (; count > 0 && pos < 32; count--) {
651 if (put_user(*k++, ®_window[pos++]))
652 return -EFAULT;
653 }
654 } else {
655 for (; count > 0 && pos < 32; count--) {
656 if (access_process_vm(target,
657 (unsigned long)
658 ®_window[pos],
659 (void *) k,
660 sizeof(*k),
661 FOLL_FORCE | FOLL_WRITE)
662 != sizeof(*k))
663 return -EFAULT;
664 k++;
665 pos++;
666 }
667 }
668 } else {
669 for (; count > 0 && pos < 16; count--) {
670 if (get_user(reg, u++))
671 return -EFAULT;
672 regs->u_regs[pos++] = reg;
673 }
674
675 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
676 reg_window -= 16;
677 if (target == current) {
678 for (; count > 0 && pos < 32; count--) {
679 if (get_user(reg, u++) ||
680 put_user(reg, ®_window[pos++]))
681 return -EFAULT;
682 }
683 } else {
684 for (; count > 0 && pos < 32; count--) {
685 if (access_process_vm(target,
686 (unsigned long)
687 u,
688 ®, sizeof(reg),
689 FOLL_FORCE)
690 != sizeof(reg))
691 return -EFAULT;
692 if (access_process_vm(target,
693 (unsigned long)
694 ®_window[pos],
695 ®, sizeof(reg),
696 FOLL_FORCE | FOLL_WRITE)
697 != sizeof(reg))
698 return -EFAULT;
699 pos++;
700 u++;
701 }
702 }
703 }
704 while (count > 0) {
705 unsigned long tstate;
706
707 if (kbuf)
708 reg = *k++;
709 else if (get_user(reg, u++))
710 return -EFAULT;
711
712 switch (pos) {
713 case 32: /* PSR */
714 tstate = regs->tstate;
715 tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
716 tstate |= psr_to_tstate_icc(reg);
717 if (reg & PSR_SYSCALL)
718 tstate |= TSTATE_SYSCALL;
719 regs->tstate = tstate;
720 break;
721 case 33: /* PC */
722 regs->tpc = reg;
723 break;
724 case 34: /* NPC */
725 regs->tnpc = reg;
726 break;
727 case 35: /* Y */
728 regs->y = reg;
729 break;
730 case 36: /* WIM */
731 case 37: /* TBR */
732 break;
733 default:
734 goto finish;
735 }
736
737 pos++;
738 count--;
739 }
740finish:
741 pos *= sizeof(reg);
742 count *= sizeof(reg);
743
744 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
745 38 * sizeof(reg), -1);
746}
747
748static int fpregs32_get(struct task_struct *target,
749 const struct user_regset *regset,
750 unsigned int pos, unsigned int count,
751 void *kbuf, void __user *ubuf)
752{
753 const unsigned long *fpregs = task_thread_info(target)->fpregs;
754 compat_ulong_t enabled;
755 unsigned long fprs;
756 compat_ulong_t fsr;
757 int ret = 0;
758
759 if (target == current)
760 save_and_clear_fpu();
761
762 fprs = task_thread_info(target)->fpsaved[0];
763 if (fprs & FPRS_FEF) {
764 fsr = task_thread_info(target)->xfsr[0];
765 enabled = 1;
766 } else {
767 fsr = 0;
768 enabled = 0;
769 }
770
771 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
772 fpregs,
773 0, 32 * sizeof(u32));
774
775 if (!ret)
776 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
777 32 * sizeof(u32),
778 33 * sizeof(u32));
779 if (!ret)
780 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
781 &fsr,
782 33 * sizeof(u32),
783 34 * sizeof(u32));
784
785 if (!ret) {
786 compat_ulong_t val;
787
788 val = (enabled << 8) | (8 << 16);
789 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
790 &val,
791 34 * sizeof(u32),
792 35 * sizeof(u32));
793 }
794
795 if (!ret)
796 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
797 35 * sizeof(u32), -1);
798
799 return ret;
800}
801
802static int fpregs32_set(struct task_struct *target,
803 const struct user_regset *regset,
804 unsigned int pos, unsigned int count,
805 const void *kbuf, const void __user *ubuf)
806{
807 unsigned long *fpregs = task_thread_info(target)->fpregs;
808 unsigned long fprs;
809 int ret;
810
811 if (target == current)
812 save_and_clear_fpu();
813
814 fprs = task_thread_info(target)->fpsaved[0];
815
816 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
817 fpregs,
818 0, 32 * sizeof(u32));
819 if (!ret)
820 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
821 32 * sizeof(u32),
822 33 * sizeof(u32));
823 if (!ret && count > 0) {
824 compat_ulong_t fsr;
825 unsigned long val;
826
827 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
828 &fsr,
829 33 * sizeof(u32),
830 34 * sizeof(u32));
831 if (!ret) {
832 val = task_thread_info(target)->xfsr[0];
833 val &= 0xffffffff00000000UL;
834 val |= fsr;
835 task_thread_info(target)->xfsr[0] = val;
836 }
837 }
838
839 fprs |= (FPRS_FEF | FPRS_DL);
840 task_thread_info(target)->fpsaved[0] = fprs;
841
842 if (!ret)
843 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
844 34 * sizeof(u32), -1);
845 return ret;
846}
847
848static const struct user_regset sparc32_regsets[] = {
849 /* Format is:
850 * G0 --> G7
851 * O0 --> O7
852 * L0 --> L7
853 * I0 --> I7
854 * PSR, PC, nPC, Y, WIM, TBR
855 */
856 [REGSET_GENERAL] = {
857 .core_note_type = NT_PRSTATUS,
858 .n = 38,
859 .size = sizeof(u32), .align = sizeof(u32),
860 .get = genregs32_get, .set = genregs32_set
861 },
862 /* Format is:
863 * F0 --> F31
864 * empty 32-bit word
865 * FSR (32--bit word)
866 * FPU QUEUE COUNT (8-bit char)
867 * FPU QUEUE ENTRYSIZE (8-bit char)
868 * FPU ENABLED (8-bit char)
869 * empty 8-bit char
870 * FPU QUEUE (64 32-bit ints)
871 */
872 [REGSET_FP] = {
873 .core_note_type = NT_PRFPREG,
874 .n = 99,
875 .size = sizeof(u32), .align = sizeof(u32),
876 .get = fpregs32_get, .set = fpregs32_set
877 },
878};
879
880static const struct user_regset_view user_sparc32_view = {
881 .name = "sparc", .e_machine = EM_SPARC,
882 .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
883};
884#endif /* CONFIG_COMPAT */
885
886const struct user_regset_view *task_user_regset_view(struct task_struct *task)
887{
888#ifdef CONFIG_COMPAT
889 if (test_tsk_thread_flag(task, TIF_32BIT))
890 return &user_sparc32_view;
891#endif
892 return &user_sparc64_view;
893}
894
895#ifdef CONFIG_COMPAT
896struct compat_fps {
897 unsigned int regs[32];
898 unsigned int fsr;
899 unsigned int flags;
900 unsigned int extra;
901 unsigned int fpqd;
902 struct compat_fq {
903 unsigned int insnaddr;
904 unsigned int insn;
905 } fpq[16];
906};
907
908long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
909 compat_ulong_t caddr, compat_ulong_t cdata)
910{
911 const struct user_regset_view *view = task_user_regset_view(current);
912 compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
913 struct pt_regs32 __user *pregs;
914 struct compat_fps __user *fps;
915 unsigned long addr2 = caddr2;
916 unsigned long addr = caddr;
917 unsigned long data = cdata;
918 int ret;
919
920 pregs = (struct pt_regs32 __user *) addr;
921 fps = (struct compat_fps __user *) addr;
922
923 switch (request) {
924 case PTRACE_PEEKUSR:
925 ret = (addr != 0) ? -EIO : 0;
926 break;
927
928 case PTRACE_GETREGS:
929 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
930 32 * sizeof(u32),
931 4 * sizeof(u32),
932 &pregs->psr);
933 if (!ret)
934 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
935 1 * sizeof(u32),
936 15 * sizeof(u32),
937 &pregs->u_regs[0]);
938 break;
939
940 case PTRACE_SETREGS:
941 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
942 32 * sizeof(u32),
943 4 * sizeof(u32),
944 &pregs->psr);
945 if (!ret)
946 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
947 1 * sizeof(u32),
948 15 * sizeof(u32),
949 &pregs->u_regs[0]);
950 break;
951
952 case PTRACE_GETFPREGS:
953 ret = copy_regset_to_user(child, view, REGSET_FP,
954 0 * sizeof(u32),
955 32 * sizeof(u32),
956 &fps->regs[0]);
957 if (!ret)
958 ret = copy_regset_to_user(child, view, REGSET_FP,
959 33 * sizeof(u32),
960 1 * sizeof(u32),
961 &fps->fsr);
962 if (!ret) {
963 if (__put_user(0, &fps->flags) ||
964 __put_user(0, &fps->extra) ||
965 __put_user(0, &fps->fpqd) ||
966 clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
967 ret = -EFAULT;
968 }
969 break;
970
971 case PTRACE_SETFPREGS:
972 ret = copy_regset_from_user(child, view, REGSET_FP,
973 0 * sizeof(u32),
974 32 * sizeof(u32),
975 &fps->regs[0]);
976 if (!ret)
977 ret = copy_regset_from_user(child, view, REGSET_FP,
978 33 * sizeof(u32),
979 1 * sizeof(u32),
980 &fps->fsr);
981 break;
982
983 case PTRACE_READTEXT:
984 case PTRACE_READDATA:
985 ret = ptrace_readdata(child, addr,
986 (char __user *)addr2, data);
987 if (ret == data)
988 ret = 0;
989 else if (ret >= 0)
990 ret = -EIO;
991 break;
992
993 case PTRACE_WRITETEXT:
994 case PTRACE_WRITEDATA:
995 ret = ptrace_writedata(child, (char __user *) addr2,
996 addr, data);
997 if (ret == data)
998 ret = 0;
999 else if (ret >= 0)
1000 ret = -EIO;
1001 break;
1002
1003 default:
1004 if (request == PTRACE_SPARC_DETACH)
1005 request = PTRACE_DETACH;
1006 ret = compat_ptrace_request(child, request, addr, data);
1007 break;
1008 }
1009
1010 return ret;
1011}
1012#endif /* CONFIG_COMPAT */
1013
1014struct fps {
1015 unsigned int regs[64];
1016 unsigned long fsr;
1017};
1018
1019long arch_ptrace(struct task_struct *child, long request,
1020 unsigned long addr, unsigned long data)
1021{
1022 const struct user_regset_view *view = task_user_regset_view(current);
1023 unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
1024 struct pt_regs __user *pregs;
1025 struct fps __user *fps;
1026 void __user *addr2p;
1027 int ret;
1028
1029 pregs = (struct pt_regs __user *) addr;
1030 fps = (struct fps __user *) addr;
1031 addr2p = (void __user *) addr2;
1032
1033 switch (request) {
1034 case PTRACE_PEEKUSR:
1035 ret = (addr != 0) ? -EIO : 0;
1036 break;
1037
1038 case PTRACE_GETREGS64:
1039 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1040 1 * sizeof(u64),
1041 15 * sizeof(u64),
1042 &pregs->u_regs[0]);
1043 if (!ret) {
1044 /* XXX doesn't handle 'y' register correctly XXX */
1045 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1046 32 * sizeof(u64),
1047 4 * sizeof(u64),
1048 &pregs->tstate);
1049 }
1050 break;
1051
1052 case PTRACE_SETREGS64:
1053 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1054 1 * sizeof(u64),
1055 15 * sizeof(u64),
1056 &pregs->u_regs[0]);
1057 if (!ret) {
1058 /* XXX doesn't handle 'y' register correctly XXX */
1059 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1060 32 * sizeof(u64),
1061 4 * sizeof(u64),
1062 &pregs->tstate);
1063 }
1064 break;
1065
1066 case PTRACE_GETFPREGS64:
1067 ret = copy_regset_to_user(child, view, REGSET_FP,
1068 0 * sizeof(u64),
1069 33 * sizeof(u64),
1070 fps);
1071 break;
1072
1073 case PTRACE_SETFPREGS64:
1074 ret = copy_regset_from_user(child, view, REGSET_FP,
1075 0 * sizeof(u64),
1076 33 * sizeof(u64),
1077 fps);
1078 break;
1079
1080 case PTRACE_READTEXT:
1081 case PTRACE_READDATA:
1082 ret = ptrace_readdata(child, addr, addr2p, data);
1083 if (ret == data)
1084 ret = 0;
1085 else if (ret >= 0)
1086 ret = -EIO;
1087 break;
1088
1089 case PTRACE_WRITETEXT:
1090 case PTRACE_WRITEDATA:
1091 ret = ptrace_writedata(child, addr2p, addr, data);
1092 if (ret == data)
1093 ret = 0;
1094 else if (ret >= 0)
1095 ret = -EIO;
1096 break;
1097
1098 default:
1099 if (request == PTRACE_SPARC_DETACH)
1100 request = PTRACE_DETACH;
1101 ret = ptrace_request(child, request, addr, data);
1102 break;
1103 }
1104
1105 return ret;
1106}
1107
1108asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1109{
1110 int ret = 0;
1111
1112 /* do the secure computing check first */
1113 secure_computing_strict(regs->u_regs[UREG_G1]);
1114
1115 if (test_thread_flag(TIF_NOHZ))
1116 user_exit();
1117
1118 if (test_thread_flag(TIF_SYSCALL_TRACE))
1119 ret = tracehook_report_syscall_entry(regs);
1120
1121 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1122 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1123
1124 audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
1125 regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
1126 regs->u_regs[UREG_I3]);
1127
1128 return ret;
1129}
1130
1131asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1132{
1133 if (test_thread_flag(TIF_NOHZ))
1134 user_exit();
1135
1136 audit_syscall_exit(regs);
1137
1138 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1139 trace_sys_exit(regs, regs->u_regs[UREG_I0]);
1140
1141 if (test_thread_flag(TIF_SYSCALL_TRACE))
1142 tracehook_report_syscall_exit(regs, 0);
1143
1144 if (test_thread_flag(TIF_NOHZ))
1145 user_enter();
1146}
1147
1148/**
1149 * regs_query_register_offset() - query register offset from its name
1150 * @name: the name of a register
1151 *
1152 * regs_query_register_offset() returns the offset of a register in struct
1153 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
1154 */
1155int regs_query_register_offset(const char *name)
1156{
1157 const struct pt_regs_offset *roff;
1158
1159 for (roff = regoffset_table; roff->name != NULL; roff++)
1160 if (!strcmp(roff->name, name))
1161 return roff->offset;
1162 return -EINVAL;
1163}