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TOMOYO Linux Cross Reference
Linux/arch/sparc/kernel/ptrace_64.c

Version: ~ [ linux-5.6 ] ~ [ linux-5.5.13 ] ~ [ linux-5.4.28 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.113 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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/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_tsk_thread_flag(current, TIF_32BIT)) {
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_tsk_thread_flag(current, TIF_32BIT)) {
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 }
1095 

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