Linux Kernel  3.7.1
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ptrace_64.c
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1 /* ptrace.c: Sparc process tracing support.
2  *
3  * Copyright (C) 1996, 2008 David S. Miller ([email protected])
4  * Copyright (C) 1997 Jakub Jelinek ([email protected])
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/ptrace.h>
18 #include <linux/user.h>
19 #include <linux/smp.h>
20 #include <linux/security.h>
21 #include <linux/seccomp.h>
22 #include <linux/audit.h>
23 #include <linux/signal.h>
24 #include <linux/regset.h>
25 #include <linux/tracehook.h>
26 #include <trace/syscall.h>
27 #include <linux/compat.h>
28 #include <linux/elf.h>
29 
30 #include <asm/asi.h>
31 #include <asm/pgtable.h>
32 #include <asm/uaccess.h>
33 #include <asm/psrcompat.h>
34 #include <asm/visasm.h>
35 #include <asm/spitfire.h>
36 #include <asm/page.h>
37 #include <asm/cpudata.h>
38 #include <asm/cacheflush.h>
39 
40 #define CREATE_TRACE_POINTS
41 #include <trace/events/syscalls.h>
42 
43 #include "entry.h"
44 
45 /* #define ALLOW_INIT_TRACING */
46 
47 /*
48  * Called by kernel/ptrace.c when detaching..
49  *
50  * Make sure single step bits etc are not set.
51  */
52 void ptrace_disable(struct task_struct *child)
53 {
54  /* nothing to do */
55 }
56 
57 /* To get the necessary page struct, access_process_vm() first calls
58  * get_user_pages(). This has done a flush_dcache_page() on the
59  * accessed page. Then our caller (copy_{to,from}_user_page()) did
60  * to memcpy to read/write the data from that page.
61  *
62  * Now, the only thing we have to do is:
63  * 1) flush the D-cache if it's possible than an illegal alias
64  * has been created
65  * 2) flush the I-cache if this is pre-cheetah and we did a write
66  */
67 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
68  unsigned long uaddr, void *kaddr,
69  unsigned long len, int write)
70 {
71  BUG_ON(len > PAGE_SIZE);
72 
73  if (tlb_type == hypervisor)
74  return;
75 
76  preempt_disable();
77 
78 #ifdef DCACHE_ALIASING_POSSIBLE
79  /* If bit 13 of the kernel address we used to access the
80  * user page is the same as the virtual address that page
81  * is mapped to in the user's address space, we can skip the
82  * D-cache flush.
83  */
84  if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
85  unsigned long start = __pa(kaddr);
86  unsigned long end = start + len;
87  unsigned long dcache_line_size;
88 
89  dcache_line_size = local_cpu_data().dcache_line_size;
90 
91  if (tlb_type == spitfire) {
92  for (; start < end; start += dcache_line_size)
93  spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
94  } else {
95  start &= ~(dcache_line_size - 1);
96  for (; start < end; start += dcache_line_size)
97  __asm__ __volatile__(
98  "stxa %%g0, [%0] %1\n\t"
99  "membar #Sync"
100  : /* no outputs */
101  : "r" (start),
102  "i" (ASI_DCACHE_INVALIDATE));
103  }
104  }
105 #endif
106  if (write && tlb_type == spitfire) {
107  unsigned long start = (unsigned long) kaddr;
108  unsigned long end = start + len;
109  unsigned long icache_line_size;
110 
111  icache_line_size = local_cpu_data().icache_line_size;
112 
113  for (; start < end; start += icache_line_size)
114  flushi(start);
115  }
116 
117  preempt_enable();
118 }
119 
120 static int get_from_target(struct task_struct *target, unsigned long uaddr,
121  void *kbuf, int len)
122 {
123  if (target == current) {
124  if (copy_from_user(kbuf, (void __user *) uaddr, len))
125  return -EFAULT;
126  } else {
127  int len2 = access_process_vm(target, uaddr, kbuf, len, 0);
128  if (len2 != len)
129  return -EFAULT;
130  }
131  return 0;
132 }
133 
134 static int set_to_target(struct task_struct *target, unsigned long uaddr,
135  void *kbuf, int len)
136 {
137  if (target == current) {
138  if (copy_to_user((void __user *) uaddr, kbuf, len))
139  return -EFAULT;
140  } else {
141  int len2 = access_process_vm(target, uaddr, kbuf, len, 1);
142  if (len2 != len)
143  return -EFAULT;
144  }
145  return 0;
146 }
147 
148 static int regwindow64_get(struct task_struct *target,
149  const struct pt_regs *regs,
150  struct reg_window *wbuf)
151 {
152  unsigned long rw_addr = regs->u_regs[UREG_I6];
153 
154  if (!test_thread_64bit_stack(rw_addr)) {
155  struct reg_window32 win32;
156  int i;
157 
158  if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
159  return -EFAULT;
160  for (i = 0; i < 8; i++)
161  wbuf->locals[i] = win32.locals[i];
162  for (i = 0; i < 8; i++)
163  wbuf->ins[i] = win32.ins[i];
164  } else {
165  rw_addr += STACK_BIAS;
166  if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
167  return -EFAULT;
168  }
169 
170  return 0;
171 }
172 
173 static int regwindow64_set(struct task_struct *target,
174  const struct pt_regs *regs,
175  struct reg_window *wbuf)
176 {
177  unsigned long rw_addr = regs->u_regs[UREG_I6];
178 
179  if (!test_thread_64bit_stack(rw_addr)) {
180  struct reg_window32 win32;
181  int i;
182 
183  for (i = 0; i < 8; i++)
184  win32.locals[i] = wbuf->locals[i];
185  for (i = 0; i < 8; i++)
186  win32.ins[i] = wbuf->ins[i];
187 
188  if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
189  return -EFAULT;
190  } else {
191  rw_addr += STACK_BIAS;
192  if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
193  return -EFAULT;
194  }
195 
196  return 0;
197 }
198 
199 enum sparc_regset {
200  REGSET_GENERAL,
201  REGSET_FP,
202 };
203 
204 static int genregs64_get(struct task_struct *target,
205  const struct user_regset *regset,
206  unsigned int pos, unsigned int count,
207  void *kbuf, void __user *ubuf)
208 {
209  const struct pt_regs *regs = task_pt_regs(target);
210  int ret;
211 
212  if (target == current)
213  flushw_user();
214 
215  ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
216  regs->u_regs,
217  0, 16 * sizeof(u64));
218  if (!ret && count && pos < (32 * sizeof(u64))) {
219  struct reg_window window;
220 
221  if (regwindow64_get(target, regs, &window))
222  return -EFAULT;
223  ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
224  &window,
225  16 * sizeof(u64),
226  32 * sizeof(u64));
227  }
228 
229  if (!ret) {
230  /* TSTATE, TPC, TNPC */
231  ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
232  &regs->tstate,
233  32 * sizeof(u64),
234  35 * sizeof(u64));
235  }
236 
237  if (!ret) {
238  unsigned long y = regs->y;
239 
240  ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
241  &y,
242  35 * sizeof(u64),
243  36 * sizeof(u64));
244  }
245 
246  if (!ret) {
247  ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
248  36 * sizeof(u64), -1);
249 
250  }
251  return ret;
252 }
253 
254 static int genregs64_set(struct task_struct *target,
255  const struct user_regset *regset,
256  unsigned int pos, unsigned int count,
257  const void *kbuf, const void __user *ubuf)
258 {
259  struct pt_regs *regs = task_pt_regs(target);
260  int ret;
261 
262  if (target == current)
263  flushw_user();
264 
265  ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
266  regs->u_regs,
267  0, 16 * sizeof(u64));
268  if (!ret && count && pos < (32 * sizeof(u64))) {
269  struct reg_window window;
270 
271  if (regwindow64_get(target, regs, &window))
272  return -EFAULT;
273 
274  ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
275  &window,
276  16 * sizeof(u64),
277  32 * sizeof(u64));
278 
279  if (!ret &&
280  regwindow64_set(target, regs, &window))
281  return -EFAULT;
282  }
283 
284  if (!ret && count > 0) {
285  unsigned long tstate;
286 
287  /* TSTATE */
288  ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
289  &tstate,
290  32 * sizeof(u64),
291  33 * sizeof(u64));
292  if (!ret) {
293  /* Only the condition codes and the "in syscall"
294  * state can be modified in the %tstate register.
295  */
296  tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
297  regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
298  regs->tstate |= tstate;
299  }
300  }
301 
302  if (!ret) {
303  /* TPC, TNPC */
304  ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
305  &regs->tpc,
306  33 * sizeof(u64),
307  35 * sizeof(u64));
308  }
309 
310  if (!ret) {
311  unsigned long y;
312 
313  ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
314  &y,
315  35 * sizeof(u64),
316  36 * sizeof(u64));
317  if (!ret)
318  regs->y = y;
319  }
320 
321  if (!ret)
322  ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
323  36 * sizeof(u64), -1);
324 
325  return ret;
326 }
327 
328 static int fpregs64_get(struct task_struct *target,
329  const struct user_regset *regset,
330  unsigned int pos, unsigned int count,
331  void *kbuf, void __user *ubuf)
332 {
333  const unsigned long *fpregs = task_thread_info(target)->fpregs;
334  unsigned long fprs, fsr, gsr;
335  int ret;
336 
337  if (target == current)
338  save_and_clear_fpu();
339 
340  fprs = task_thread_info(target)->fpsaved[0];
341 
342  if (fprs & FPRS_DL)
343  ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
344  fpregs,
345  0, 16 * sizeof(u64));
346  else
347  ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
348  0,
349  16 * sizeof(u64));
350 
351  if (!ret) {
352  if (fprs & FPRS_DU)
353  ret = user_regset_copyout(&pos, &count,
354  &kbuf, &ubuf,
355  fpregs + 16,
356  16 * sizeof(u64),
357  32 * sizeof(u64));
358  else
359  ret = user_regset_copyout_zero(&pos, &count,
360  &kbuf, &ubuf,
361  16 * sizeof(u64),
362  32 * sizeof(u64));
363  }
364 
365  if (fprs & FPRS_FEF) {
366  fsr = task_thread_info(target)->xfsr[0];
367  gsr = task_thread_info(target)->gsr[0];
368  } else {
369  fsr = gsr = 0;
370  }
371 
372  if (!ret)
373  ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
374  &fsr,
375  32 * sizeof(u64),
376  33 * sizeof(u64));
377  if (!ret)
378  ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
379  &gsr,
380  33 * sizeof(u64),
381  34 * sizeof(u64));
382  if (!ret)
383  ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
384  &fprs,
385  34 * sizeof(u64),
386  35 * sizeof(u64));
387 
388  if (!ret)
389  ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
390  35 * sizeof(u64), -1);
391 
392  return ret;
393 }
394 
395 static int fpregs64_set(struct task_struct *target,
396  const struct user_regset *regset,
397  unsigned int pos, unsigned int count,
398  const void *kbuf, const void __user *ubuf)
399 {
400  unsigned long *fpregs = task_thread_info(target)->fpregs;
401  unsigned long fprs;
402  int ret;
403 
404  if (target == current)
405  save_and_clear_fpu();
406 
407  ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
408  fpregs,
409  0, 32 * sizeof(u64));
410  if (!ret)
411  ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
412  task_thread_info(target)->xfsr,
413  32 * sizeof(u64),
414  33 * sizeof(u64));
415  if (!ret)
416  ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
417  task_thread_info(target)->gsr,
418  33 * sizeof(u64),
419  34 * sizeof(u64));
420 
421  fprs = task_thread_info(target)->fpsaved[0];
422  if (!ret && count > 0) {
423  ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
424  &fprs,
425  34 * sizeof(u64),
426  35 * sizeof(u64));
427  }
428 
429  fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
430  task_thread_info(target)->fpsaved[0] = fprs;
431 
432  if (!ret)
433  ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
434  35 * sizeof(u64), -1);
435  return ret;
436 }
437 
438 static const struct user_regset sparc64_regsets[] = {
439  /* Format is:
440  * G0 --> G7
441  * O0 --> O7
442  * L0 --> L7
443  * I0 --> I7
444  * TSTATE, TPC, TNPC, Y
445  */
446  [REGSET_GENERAL] = {
447  .core_note_type = NT_PRSTATUS,
448  .n = 36,
449  .size = sizeof(u64), .align = sizeof(u64),
450  .get = genregs64_get, .set = genregs64_set
451  },
452  /* Format is:
453  * F0 --> F63
454  * FSR
455  * GSR
456  * FPRS
457  */
458  [REGSET_FP] = {
459  .core_note_type = NT_PRFPREG,
460  .n = 35,
461  .size = sizeof(u64), .align = sizeof(u64),
462  .get = fpregs64_get, .set = fpregs64_set
463  },
464 };
465 
466 static const struct user_regset_view user_sparc64_view = {
467  .name = "sparc64", .e_machine = EM_SPARCV9,
468  .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
469 };
470 
471 #ifdef CONFIG_COMPAT
472 static int genregs32_get(struct task_struct *target,
473  const struct user_regset *regset,
474  unsigned int pos, unsigned int count,
475  void *kbuf, void __user *ubuf)
476 {
477  const struct pt_regs *regs = task_pt_regs(target);
478  compat_ulong_t __user *reg_window;
479  compat_ulong_t *k = kbuf;
480  compat_ulong_t __user *u = ubuf;
481  compat_ulong_t reg;
482 
483  if (target == current)
484  flushw_user();
485 
486  pos /= sizeof(reg);
487  count /= sizeof(reg);
488 
489  if (kbuf) {
490  for (; count > 0 && pos < 16; count--)
491  *k++ = regs->u_regs[pos++];
492 
493  reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
494  reg_window -= 16;
495  if (target == current) {
496  for (; count > 0 && pos < 32; count--) {
497  if (get_user(*k++, &reg_window[pos++]))
498  return -EFAULT;
499  }
500  } else {
501  for (; count > 0 && pos < 32; count--) {
502  if (access_process_vm(target,
503  (unsigned long)
504  &reg_window[pos],
505  k, sizeof(*k), 0)
506  != sizeof(*k))
507  return -EFAULT;
508  k++;
509  pos++;
510  }
511  }
512  } else {
513  for (; count > 0 && pos < 16; count--) {
514  if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
515  return -EFAULT;
516  }
517 
518  reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
519  reg_window -= 16;
520  if (target == current) {
521  for (; count > 0 && pos < 32; count--) {
522  if (get_user(reg, &reg_window[pos++]) ||
523  put_user(reg, u++))
524  return -EFAULT;
525  }
526  } else {
527  for (; count > 0 && pos < 32; count--) {
528  if (access_process_vm(target,
529  (unsigned long)
530  &reg_window[pos],
531  &reg, sizeof(reg), 0)
532  != sizeof(reg))
533  return -EFAULT;
534  if (access_process_vm(target,
535  (unsigned long) u,
536  &reg, sizeof(reg), 1)
537  != sizeof(reg))
538  return -EFAULT;
539  pos++;
540  u++;
541  }
542  }
543  }
544  while (count > 0) {
545  switch (pos) {
546  case 32: /* PSR */
547  reg = tstate_to_psr(regs->tstate);
548  break;
549  case 33: /* PC */
550  reg = regs->tpc;
551  break;
552  case 34: /* NPC */
553  reg = regs->tnpc;
554  break;
555  case 35: /* Y */
556  reg = regs->y;
557  break;
558  case 36: /* WIM */
559  case 37: /* TBR */
560  reg = 0;
561  break;
562  default:
563  goto finish;
564  }
565 
566  if (kbuf)
567  *k++ = reg;
568  else if (put_user(reg, u++))
569  return -EFAULT;
570  pos++;
571  count--;
572  }
573 finish:
574  pos *= sizeof(reg);
575  count *= sizeof(reg);
576 
577  return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
578  38 * sizeof(reg), -1);
579 }
580 
581 static int genregs32_set(struct task_struct *target,
582  const struct user_regset *regset,
583  unsigned int pos, unsigned int count,
584  const void *kbuf, const void __user *ubuf)
585 {
586  struct pt_regs *regs = task_pt_regs(target);
587  compat_ulong_t __user *reg_window;
588  const compat_ulong_t *k = kbuf;
589  const compat_ulong_t __user *u = ubuf;
590  compat_ulong_t reg;
591 
592  if (target == current)
593  flushw_user();
594 
595  pos /= sizeof(reg);
596  count /= sizeof(reg);
597 
598  if (kbuf) {
599  for (; count > 0 && pos < 16; count--)
600  regs->u_regs[pos++] = *k++;
601 
602  reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
603  reg_window -= 16;
604  if (target == current) {
605  for (; count > 0 && pos < 32; count--) {
606  if (put_user(*k++, &reg_window[pos++]))
607  return -EFAULT;
608  }
609  } else {
610  for (; count > 0 && pos < 32; count--) {
611  if (access_process_vm(target,
612  (unsigned long)
613  &reg_window[pos],
614  (void *) k,
615  sizeof(*k), 1)
616  != sizeof(*k))
617  return -EFAULT;
618  k++;
619  pos++;
620  }
621  }
622  } else {
623  for (; count > 0 && pos < 16; count--) {
624  if (get_user(reg, u++))
625  return -EFAULT;
626  regs->u_regs[pos++] = reg;
627  }
628 
629  reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
630  reg_window -= 16;
631  if (target == current) {
632  for (; count > 0 && pos < 32; count--) {
633  if (get_user(reg, u++) ||
634  put_user(reg, &reg_window[pos++]))
635  return -EFAULT;
636  }
637  } else {
638  for (; count > 0 && pos < 32; count--) {
639  if (access_process_vm(target,
640  (unsigned long)
641  u,
642  &reg, sizeof(reg), 0)
643  != sizeof(reg))
644  return -EFAULT;
645  if (access_process_vm(target,
646  (unsigned long)
647  &reg_window[pos],
648  &reg, sizeof(reg), 1)
649  != sizeof(reg))
650  return -EFAULT;
651  pos++;
652  u++;
653  }
654  }
655  }
656  while (count > 0) {
657  unsigned long tstate;
658 
659  if (kbuf)
660  reg = *k++;
661  else if (get_user(reg, u++))
662  return -EFAULT;
663 
664  switch (pos) {
665  case 32: /* PSR */
666  tstate = regs->tstate;
667  tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
668  tstate |= psr_to_tstate_icc(reg);
669  if (reg & PSR_SYSCALL)
670  tstate |= TSTATE_SYSCALL;
671  regs->tstate = tstate;
672  break;
673  case 33: /* PC */
674  regs->tpc = reg;
675  break;
676  case 34: /* NPC */
677  regs->tnpc = reg;
678  break;
679  case 35: /* Y */
680  regs->y = reg;
681  break;
682  case 36: /* WIM */
683  case 37: /* TBR */
684  break;
685  default:
686  goto finish;
687  }
688 
689  pos++;
690  count--;
691  }
692 finish:
693  pos *= sizeof(reg);
694  count *= sizeof(reg);
695 
696  return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
697  38 * sizeof(reg), -1);
698 }
699 
700 static int fpregs32_get(struct task_struct *target,
701  const struct user_regset *regset,
702  unsigned int pos, unsigned int count,
703  void *kbuf, void __user *ubuf)
704 {
705  const unsigned long *fpregs = task_thread_info(target)->fpregs;
706  compat_ulong_t enabled;
707  unsigned long fprs;
708  compat_ulong_t fsr;
709  int ret = 0;
710 
711  if (target == current)
712  save_and_clear_fpu();
713 
714  fprs = task_thread_info(target)->fpsaved[0];
715  if (fprs & FPRS_FEF) {
716  fsr = task_thread_info(target)->xfsr[0];
717  enabled = 1;
718  } else {
719  fsr = 0;
720  enabled = 0;
721  }
722 
723  ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
724  fpregs,
725  0, 32 * sizeof(u32));
726 
727  if (!ret)
728  ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
729  32 * sizeof(u32),
730  33 * sizeof(u32));
731  if (!ret)
732  ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
733  &fsr,
734  33 * sizeof(u32),
735  34 * sizeof(u32));
736 
737  if (!ret) {
738  compat_ulong_t val;
739 
740  val = (enabled << 8) | (8 << 16);
741  ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
742  &val,
743  34 * sizeof(u32),
744  35 * sizeof(u32));
745  }
746 
747  if (!ret)
748  ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
749  35 * sizeof(u32), -1);
750 
751  return ret;
752 }
753 
754 static int fpregs32_set(struct task_struct *target,
755  const struct user_regset *regset,
756  unsigned int pos, unsigned int count,
757  const void *kbuf, const void __user *ubuf)
758 {
759  unsigned long *fpregs = task_thread_info(target)->fpregs;
760  unsigned long fprs;
761  int ret;
762 
763  if (target == current)
764  save_and_clear_fpu();
765 
766  fprs = task_thread_info(target)->fpsaved[0];
767 
768  ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
769  fpregs,
770  0, 32 * sizeof(u32));
771  if (!ret)
772  user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
773  32 * sizeof(u32),
774  33 * sizeof(u32));
775  if (!ret && count > 0) {
776  compat_ulong_t fsr;
777  unsigned long val;
778 
779  ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
780  &fsr,
781  33 * sizeof(u32),
782  34 * sizeof(u32));
783  if (!ret) {
784  val = task_thread_info(target)->xfsr[0];
785  val &= 0xffffffff00000000UL;
786  val |= fsr;
787  task_thread_info(target)->xfsr[0] = val;
788  }
789  }
790 
791  fprs |= (FPRS_FEF | FPRS_DL);
792  task_thread_info(target)->fpsaved[0] = fprs;
793 
794  if (!ret)
795  ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
796  34 * sizeof(u32), -1);
797  return ret;
798 }
799 
800 static const struct user_regset sparc32_regsets[] = {
801  /* Format is:
802  * G0 --> G7
803  * O0 --> O7
804  * L0 --> L7
805  * I0 --> I7
806  * PSR, PC, nPC, Y, WIM, TBR
807  */
808  [REGSET_GENERAL] = {
809  .core_note_type = NT_PRSTATUS,
810  .n = 38,
811  .size = sizeof(u32), .align = sizeof(u32),
812  .get = genregs32_get, .set = genregs32_set
813  },
814  /* Format is:
815  * F0 --> F31
816  * empty 32-bit word
817  * FSR (32--bit word)
818  * FPU QUEUE COUNT (8-bit char)
819  * FPU QUEUE ENTRYSIZE (8-bit char)
820  * FPU ENABLED (8-bit char)
821  * empty 8-bit char
822  * FPU QUEUE (64 32-bit ints)
823  */
824  [REGSET_FP] = {
825  .core_note_type = NT_PRFPREG,
826  .n = 99,
827  .size = sizeof(u32), .align = sizeof(u32),
828  .get = fpregs32_get, .set = fpregs32_set
829  },
830 };
831 
832 static const struct user_regset_view user_sparc32_view = {
833  .name = "sparc", .e_machine = EM_SPARC,
834  .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
835 };
836 #endif /* CONFIG_COMPAT */
837 
838 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
839 {
840 #ifdef CONFIG_COMPAT
841  if (test_tsk_thread_flag(task, TIF_32BIT))
842  return &user_sparc32_view;
843 #endif
844  return &user_sparc64_view;
845 }
846 
847 #ifdef CONFIG_COMPAT
848 struct compat_fps {
849  unsigned int regs[32];
850  unsigned int fsr;
851  unsigned int flags;
852  unsigned int extra;
853  unsigned int fpqd;
854  struct compat_fq {
855  unsigned int insnaddr;
856  unsigned int insn;
857  } fpq[16];
858 };
859 
860 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
861  compat_ulong_t caddr, compat_ulong_t cdata)
862 {
863  const struct user_regset_view *view = task_user_regset_view(current);
864  compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
865  struct pt_regs32 __user *pregs;
866  struct compat_fps __user *fps;
867  unsigned long addr2 = caddr2;
868  unsigned long addr = caddr;
869  unsigned long data = cdata;
870  int ret;
871 
872  pregs = (struct pt_regs32 __user *) addr;
873  fps = (struct compat_fps __user *) addr;
874 
875  switch (request) {
876  case PTRACE_PEEKUSR:
877  ret = (addr != 0) ? -EIO : 0;
878  break;
879 
880  case PTRACE_GETREGS:
881  ret = copy_regset_to_user(child, view, REGSET_GENERAL,
882  32 * sizeof(u32),
883  4 * sizeof(u32),
884  &pregs->psr);
885  if (!ret)
886  ret = copy_regset_to_user(child, view, REGSET_GENERAL,
887  1 * sizeof(u32),
888  15 * sizeof(u32),
889  &pregs->u_regs[0]);
890  break;
891 
892  case PTRACE_SETREGS:
893  ret = copy_regset_from_user(child, view, REGSET_GENERAL,
894  32 * sizeof(u32),
895  4 * sizeof(u32),
896  &pregs->psr);
897  if (!ret)
898  ret = copy_regset_from_user(child, view, REGSET_GENERAL,
899  1 * sizeof(u32),
900  15 * sizeof(u32),
901  &pregs->u_regs[0]);
902  break;
903 
904  case PTRACE_GETFPREGS:
905  ret = copy_regset_to_user(child, view, REGSET_FP,
906  0 * sizeof(u32),
907  32 * sizeof(u32),
908  &fps->regs[0]);
909  if (!ret)
910  ret = copy_regset_to_user(child, view, REGSET_FP,
911  33 * sizeof(u32),
912  1 * sizeof(u32),
913  &fps->fsr);
914  if (!ret) {
915  if (__put_user(0, &fps->flags) ||
916  __put_user(0, &fps->extra) ||
917  __put_user(0, &fps->fpqd) ||
918  clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
919  ret = -EFAULT;
920  }
921  break;
922 
923  case PTRACE_SETFPREGS:
924  ret = copy_regset_from_user(child, view, REGSET_FP,
925  0 * sizeof(u32),
926  32 * sizeof(u32),
927  &fps->regs[0]);
928  if (!ret)
929  ret = copy_regset_from_user(child, view, REGSET_FP,
930  33 * sizeof(u32),
931  1 * sizeof(u32),
932  &fps->fsr);
933  break;
934 
935  case PTRACE_READTEXT:
936  case PTRACE_READDATA:
937  ret = ptrace_readdata(child, addr,
938  (char __user *)addr2, data);
939  if (ret == data)
940  ret = 0;
941  else if (ret >= 0)
942  ret = -EIO;
943  break;
944 
945  case PTRACE_WRITETEXT:
946  case PTRACE_WRITEDATA:
947  ret = ptrace_writedata(child, (char __user *) addr2,
948  addr, data);
949  if (ret == data)
950  ret = 0;
951  else if (ret >= 0)
952  ret = -EIO;
953  break;
954 
955  default:
956  if (request == PTRACE_SPARC_DETACH)
957  request = PTRACE_DETACH;
958  ret = compat_ptrace_request(child, request, addr, data);
959  break;
960  }
961 
962  return ret;
963 }
964 #endif /* CONFIG_COMPAT */
965 
966 struct fps {
967  unsigned int regs[64];
968  unsigned long fsr;
969 };
970 
971 long arch_ptrace(struct task_struct *child, long request,
972  unsigned long addr, unsigned long data)
973 {
974  const struct user_regset_view *view = task_user_regset_view(current);
975  unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
976  struct pt_regs __user *pregs;
977  struct fps __user *fps;
978  void __user *addr2p;
979  int ret;
980 
981  pregs = (struct pt_regs __user *) addr;
982  fps = (struct fps __user *) addr;
983  addr2p = (void __user *) addr2;
984 
985  switch (request) {
986  case PTRACE_PEEKUSR:
987  ret = (addr != 0) ? -EIO : 0;
988  break;
989 
990  case PTRACE_GETREGS64:
991  ret = copy_regset_to_user(child, view, REGSET_GENERAL,
992  1 * sizeof(u64),
993  15 * sizeof(u64),
994  &pregs->u_regs[0]);
995  if (!ret) {
996  /* XXX doesn't handle 'y' register correctly XXX */
997  ret = copy_regset_to_user(child, view, REGSET_GENERAL,
998  32 * sizeof(u64),
999  4 * sizeof(u64),
1000  &pregs->tstate);
1001  }
1002  break;
1003 
1004  case PTRACE_SETREGS64:
1005  ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1006  1 * sizeof(u64),
1007  15 * sizeof(u64),
1008  &pregs->u_regs[0]);
1009  if (!ret) {
1010  /* XXX doesn't handle 'y' register correctly XXX */
1011  ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1012  32 * sizeof(u64),
1013  4 * sizeof(u64),
1014  &pregs->tstate);
1015  }
1016  break;
1017 
1018  case PTRACE_GETFPREGS64:
1019  ret = copy_regset_to_user(child, view, REGSET_FP,
1020  0 * sizeof(u64),
1021  33 * sizeof(u64),
1022  fps);
1023  break;
1024 
1025  case PTRACE_SETFPREGS64:
1026  ret = copy_regset_from_user(child, view, REGSET_FP,
1027  0 * sizeof(u64),
1028  33 * sizeof(u64),
1029  fps);
1030  break;
1031 
1032  case PTRACE_READTEXT:
1033  case PTRACE_READDATA:
1034  ret = ptrace_readdata(child, addr, addr2p, data);
1035  if (ret == data)
1036  ret = 0;
1037  else if (ret >= 0)
1038  ret = -EIO;
1039  break;
1040 
1041  case PTRACE_WRITETEXT:
1042  case PTRACE_WRITEDATA:
1043  ret = ptrace_writedata(child, addr2p, addr, data);
1044  if (ret == data)
1045  ret = 0;
1046  else if (ret >= 0)
1047  ret = -EIO;
1048  break;
1049 
1050  default:
1051  if (request == PTRACE_SPARC_DETACH)
1052  request = PTRACE_DETACH;
1053  ret = ptrace_request(child, request, addr, data);
1054  break;
1055  }
1056 
1057  return ret;
1058 }
1059 
1060 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1061 {
1062  int ret = 0;
1063 
1064  /* do the secure computing check first */
1065  secure_computing_strict(regs->u_regs[UREG_G1]);
1066 
1067  if (test_thread_flag(TIF_SYSCALL_TRACE))
1068  ret = tracehook_report_syscall_entry(regs);
1069 
1070  if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1071  trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1072 
1073  audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
1074  AUDIT_ARCH_SPARC :
1075  AUDIT_ARCH_SPARC64),
1076  regs->u_regs[UREG_G1],
1077  regs->u_regs[UREG_I0],
1078  regs->u_regs[UREG_I1],
1079  regs->u_regs[UREG_I2],
1080  regs->u_regs[UREG_I3]);
1081 
1082  return ret;
1083 }
1084 
1085 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1086 {
1087  audit_syscall_exit(regs);
1088 
1089  if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1090  trace_sys_exit(regs, regs->u_regs[UREG_G1]);
1091 
1092  if (test_thread_flag(TIF_SYSCALL_TRACE))
1093  tracehook_report_syscall_exit(regs, 0);
1094 }
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