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Linux/arch/parisc/kernel/ptrace.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Kernel support for the ptrace() and syscall tracing interfaces.
  4  *
  5  * Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc.
  6  * Copyright (C) 2000 Matthew Wilcox <matthew@wil.cx>
  7  * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
  8  * Copyright (C) 2008-2016 Helge Deller <deller@gmx.de>
  9  */
 10 
 11 #include <linux/kernel.h>
 12 #include <linux/sched.h>
 13 #include <linux/mm.h>
 14 #include <linux/smp.h>
 15 #include <linux/elf.h>
 16 #include <linux/errno.h>
 17 #include <linux/ptrace.h>
 18 #include <linux/tracehook.h>
 19 #include <linux/user.h>
 20 #include <linux/personality.h>
 21 #include <linux/regset.h>
 22 #include <linux/security.h>
 23 #include <linux/seccomp.h>
 24 #include <linux/compat.h>
 25 #include <linux/signal.h>
 26 #include <linux/audit.h>
 27 
 28 #include <linux/uaccess.h>
 29 #include <asm/pgtable.h>
 30 #include <asm/processor.h>
 31 #include <asm/asm-offsets.h>
 32 
 33 /* PSW bits we allow the debugger to modify */
 34 #define USER_PSW_BITS   (PSW_N | PSW_B | PSW_V | PSW_CB)
 35 
 36 #define CREATE_TRACE_POINTS
 37 #include <trace/events/syscalls.h>
 38 
 39 /*
 40  * These are our native regset flavors.
 41  */
 42 enum parisc_regset {
 43         REGSET_GENERAL,
 44         REGSET_FP
 45 };
 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 *task)
 53 {
 54         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
 55         clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
 56 
 57         /* make sure the trap bits are not set */
 58         pa_psw(task)->r = 0;
 59         pa_psw(task)->t = 0;
 60         pa_psw(task)->h = 0;
 61         pa_psw(task)->l = 0;
 62 }
 63 
 64 /*
 65  * The following functions are called by ptrace_resume() when
 66  * enabling or disabling single/block tracing.
 67  */
 68 void user_disable_single_step(struct task_struct *task)
 69 {
 70         ptrace_disable(task);
 71 }
 72 
 73 void user_enable_single_step(struct task_struct *task)
 74 {
 75         clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
 76         set_tsk_thread_flag(task, TIF_SINGLESTEP);
 77 
 78         if (pa_psw(task)->n) {
 79                 struct siginfo si;
 80 
 81                 /* Nullified, just crank over the queue. */
 82                 task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1];
 83                 task_regs(task)->iasq[0] = task_regs(task)->iasq[1];
 84                 task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4;
 85                 pa_psw(task)->n = 0;
 86                 pa_psw(task)->x = 0;
 87                 pa_psw(task)->y = 0;
 88                 pa_psw(task)->z = 0;
 89                 pa_psw(task)->b = 0;
 90                 ptrace_disable(task);
 91                 /* Don't wake up the task, but let the
 92                    parent know something happened. */
 93                 si.si_code = TRAP_TRACE;
 94                 si.si_addr = (void __user *) (task_regs(task)->iaoq[0] & ~3);
 95                 si.si_signo = SIGTRAP;
 96                 si.si_errno = 0;
 97                 force_sig_info(SIGTRAP, &si, task);
 98                 /* notify_parent(task, SIGCHLD); */
 99                 return;
100         }
101 
102         /* Enable recovery counter traps.  The recovery counter
103          * itself will be set to zero on a task switch.  If the
104          * task is suspended on a syscall then the syscall return
105          * path will overwrite the recovery counter with a suitable
106          * value such that it traps once back in user space.  We
107          * disable interrupts in the tasks PSW here also, to avoid
108          * interrupts while the recovery counter is decrementing.
109          */
110         pa_psw(task)->r = 1;
111         pa_psw(task)->t = 0;
112         pa_psw(task)->h = 0;
113         pa_psw(task)->l = 0;
114 }
115 
116 void user_enable_block_step(struct task_struct *task)
117 {
118         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
119         set_tsk_thread_flag(task, TIF_BLOCKSTEP);
120 
121         /* Enable taken branch trap. */
122         pa_psw(task)->r = 0;
123         pa_psw(task)->t = 1;
124         pa_psw(task)->h = 0;
125         pa_psw(task)->l = 0;
126 }
127 
128 long arch_ptrace(struct task_struct *child, long request,
129                  unsigned long addr, unsigned long data)
130 {
131         unsigned long __user *datap = (unsigned long __user *)data;
132         unsigned long tmp;
133         long ret = -EIO;
134 
135         switch (request) {
136 
137         /* Read the word at location addr in the USER area.  For ptraced
138            processes, the kernel saves all regs on a syscall. */
139         case PTRACE_PEEKUSR:
140                 if ((addr & (sizeof(unsigned long)-1)) ||
141                      addr >= sizeof(struct pt_regs))
142                         break;
143                 tmp = *(unsigned long *) ((char *) task_regs(child) + addr);
144                 ret = put_user(tmp, datap);
145                 break;
146 
147         /* Write the word at location addr in the USER area.  This will need
148            to change when the kernel no longer saves all regs on a syscall.
149            FIXME.  There is a problem at the moment in that r3-r18 are only
150            saved if the process is ptraced on syscall entry, and even then
151            those values are overwritten by actual register values on syscall
152            exit. */
153         case PTRACE_POKEUSR:
154                 /* Some register values written here may be ignored in
155                  * entry.S:syscall_restore_rfi; e.g. iaoq is written with
156                  * r31/r31+4, and not with the values in pt_regs.
157                  */
158                 if (addr == PT_PSW) {
159                         /* Allow writing to Nullify, Divide-step-correction,
160                          * and carry/borrow bits.
161                          * BEWARE, if you set N, and then single step, it won't
162                          * stop on the nullified instruction.
163                          */
164                         data &= USER_PSW_BITS;
165                         task_regs(child)->gr[0] &= ~USER_PSW_BITS;
166                         task_regs(child)->gr[0] |= data;
167                         ret = 0;
168                         break;
169                 }
170 
171                 if ((addr & (sizeof(unsigned long)-1)) ||
172                      addr >= sizeof(struct pt_regs))
173                         break;
174                 if ((addr >= PT_GR1 && addr <= PT_GR31) ||
175                                 addr == PT_IAOQ0 || addr == PT_IAOQ1 ||
176                                 (addr >= PT_FR0 && addr <= PT_FR31 + 4) ||
177                                 addr == PT_SAR) {
178                         *(unsigned long *) ((char *) task_regs(child) + addr) = data;
179                         ret = 0;
180                 }
181                 break;
182 
183         case PTRACE_GETREGS:    /* Get all gp regs from the child. */
184                 return copy_regset_to_user(child,
185                                            task_user_regset_view(current),
186                                            REGSET_GENERAL,
187                                            0, sizeof(struct user_regs_struct),
188                                            datap);
189 
190         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
191                 return copy_regset_from_user(child,
192                                              task_user_regset_view(current),
193                                              REGSET_GENERAL,
194                                              0, sizeof(struct user_regs_struct),
195                                              datap);
196 
197         case PTRACE_GETFPREGS:  /* Get the child FPU state. */
198                 return copy_regset_to_user(child,
199                                            task_user_regset_view(current),
200                                            REGSET_FP,
201                                            0, sizeof(struct user_fp_struct),
202                                            datap);
203 
204         case PTRACE_SETFPREGS:  /* Set the child FPU state. */
205                 return copy_regset_from_user(child,
206                                              task_user_regset_view(current),
207                                              REGSET_FP,
208                                              0, sizeof(struct user_fp_struct),
209                                              datap);
210 
211         default:
212                 ret = ptrace_request(child, request, addr, data);
213                 break;
214         }
215 
216         return ret;
217 }
218 
219 
220 #ifdef CONFIG_COMPAT
221 
222 /* This function is needed to translate 32 bit pt_regs offsets in to
223  * 64 bit pt_regs offsets.  For example, a 32 bit gdb under a 64 bit kernel
224  * will request offset 12 if it wants gr3, but the lower 32 bits of
225  * the 64 bit kernels view of gr3 will be at offset 28 (3*8 + 4).
226  * This code relies on a 32 bit pt_regs being comprised of 32 bit values
227  * except for the fp registers which (a) are 64 bits, and (b) follow
228  * the gr registers at the start of pt_regs.  The 32 bit pt_regs should
229  * be half the size of the 64 bit pt_regs, plus 32*4 to allow for fr[]
230  * being 64 bit in both cases.
231  */
232 
233 static compat_ulong_t translate_usr_offset(compat_ulong_t offset)
234 {
235         if (offset < 0)
236                 return sizeof(struct pt_regs);
237         else if (offset <= 32*4)        /* gr[0..31] */
238                 return offset * 2 + 4;
239         else if (offset <= 32*4+32*8)   /* gr[0..31] + fr[0..31] */
240                 return offset + 32*4;
241         else if (offset < sizeof(struct pt_regs)/2 + 32*4)
242                 return offset * 2 + 4 - 32*8;
243         else
244                 return sizeof(struct pt_regs);
245 }
246 
247 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
248                         compat_ulong_t addr, compat_ulong_t data)
249 {
250         compat_uint_t tmp;
251         long ret = -EIO;
252 
253         switch (request) {
254 
255         case PTRACE_PEEKUSR:
256                 if (addr & (sizeof(compat_uint_t)-1))
257                         break;
258                 addr = translate_usr_offset(addr);
259                 if (addr >= sizeof(struct pt_regs))
260                         break;
261 
262                 tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr);
263                 ret = put_user(tmp, (compat_uint_t *) (unsigned long) data);
264                 break;
265 
266         /* Write the word at location addr in the USER area.  This will need
267            to change when the kernel no longer saves all regs on a syscall.
268            FIXME.  There is a problem at the moment in that r3-r18 are only
269            saved if the process is ptraced on syscall entry, and even then
270            those values are overwritten by actual register values on syscall
271            exit. */
272         case PTRACE_POKEUSR:
273                 /* Some register values written here may be ignored in
274                  * entry.S:syscall_restore_rfi; e.g. iaoq is written with
275                  * r31/r31+4, and not with the values in pt_regs.
276                  */
277                 if (addr == PT_PSW) {
278                         /* Since PT_PSW==0, it is valid for 32 bit processes
279                          * under 64 bit kernels as well.
280                          */
281                         ret = arch_ptrace(child, request, addr, data);
282                 } else {
283                         if (addr & (sizeof(compat_uint_t)-1))
284                                 break;
285                         addr = translate_usr_offset(addr);
286                         if (addr >= sizeof(struct pt_regs))
287                                 break;
288                         if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
289                                 /* Special case, fp regs are 64 bits anyway */
290                                 *(__u64 *) ((char *) task_regs(child) + addr) = data;
291                                 ret = 0;
292                         }
293                         else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) ||
294                                         addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 ||
295                                         addr == PT_SAR+4) {
296                                 /* Zero the top 32 bits */
297                                 *(__u32 *) ((char *) task_regs(child) + addr - 4) = 0;
298                                 *(__u32 *) ((char *) task_regs(child) + addr) = data;
299                                 ret = 0;
300                         }
301                 }
302                 break;
303 
304         default:
305                 ret = compat_ptrace_request(child, request, addr, data);
306                 break;
307         }
308 
309         return ret;
310 }
311 #endif
312 
313 long do_syscall_trace_enter(struct pt_regs *regs)
314 {
315         if (test_thread_flag(TIF_SYSCALL_TRACE) &&
316             tracehook_report_syscall_entry(regs)) {
317                 /*
318                  * Tracing decided this syscall should not happen or the
319                  * debugger stored an invalid system call number. Skip
320                  * the system call and the system call restart handling.
321                  */
322                 regs->gr[20] = -1UL;
323                 goto out;
324         }
325 
326         /* Do the secure computing check after ptrace. */
327         if (secure_computing(NULL) == -1)
328                 return -1;
329 
330 #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
331         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
332                 trace_sys_enter(regs, regs->gr[20]);
333 #endif
334 
335 #ifdef CONFIG_64BIT
336         if (!is_compat_task())
337                 audit_syscall_entry(regs->gr[20], regs->gr[26], regs->gr[25],
338                                     regs->gr[24], regs->gr[23]);
339         else
340 #endif
341                 audit_syscall_entry(regs->gr[20] & 0xffffffff,
342                         regs->gr[26] & 0xffffffff,
343                         regs->gr[25] & 0xffffffff,
344                         regs->gr[24] & 0xffffffff,
345                         regs->gr[23] & 0xffffffff);
346 
347 out:
348         /*
349          * Sign extend the syscall number to 64bit since it may have been
350          * modified by a compat ptrace call
351          */
352         return (int) ((u32) regs->gr[20]);
353 }
354 
355 void do_syscall_trace_exit(struct pt_regs *regs)
356 {
357         int stepping = test_thread_flag(TIF_SINGLESTEP) ||
358                 test_thread_flag(TIF_BLOCKSTEP);
359 
360         audit_syscall_exit(regs);
361 
362 #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
363         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
364                 trace_sys_exit(regs, regs->gr[20]);
365 #endif
366 
367         if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
368                 tracehook_report_syscall_exit(regs, stepping);
369 }
370 
371 
372 /*
373  * regset functions.
374  */
375 
376 static int fpr_get(struct task_struct *target,
377                      const struct user_regset *regset,
378                      unsigned int pos, unsigned int count,
379                      void *kbuf, void __user *ubuf)
380 {
381         struct pt_regs *regs = task_regs(target);
382         __u64 *k = kbuf;
383         __u64 __user *u = ubuf;
384         __u64 reg;
385 
386         pos /= sizeof(reg);
387         count /= sizeof(reg);
388 
389         if (kbuf)
390                 for (; count > 0 && pos < ELF_NFPREG; --count)
391                         *k++ = regs->fr[pos++];
392         else
393                 for (; count > 0 && pos < ELF_NFPREG; --count)
394                         if (__put_user(regs->fr[pos++], u++))
395                                 return -EFAULT;
396 
397         kbuf = k;
398         ubuf = u;
399         pos *= sizeof(reg);
400         count *= sizeof(reg);
401         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
402                                         ELF_NFPREG * sizeof(reg), -1);
403 }
404 
405 static int fpr_set(struct task_struct *target,
406                      const struct user_regset *regset,
407                      unsigned int pos, unsigned int count,
408                      const void *kbuf, const void __user *ubuf)
409 {
410         struct pt_regs *regs = task_regs(target);
411         const __u64 *k = kbuf;
412         const __u64 __user *u = ubuf;
413         __u64 reg;
414 
415         pos /= sizeof(reg);
416         count /= sizeof(reg);
417 
418         if (kbuf)
419                 for (; count > 0 && pos < ELF_NFPREG; --count)
420                         regs->fr[pos++] = *k++;
421         else
422                 for (; count > 0 && pos < ELF_NFPREG; --count) {
423                         if (__get_user(reg, u++))
424                                 return -EFAULT;
425                         regs->fr[pos++] = reg;
426                 }
427 
428         kbuf = k;
429         ubuf = u;
430         pos *= sizeof(reg);
431         count *= sizeof(reg);
432         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
433                                          ELF_NFPREG * sizeof(reg), -1);
434 }
435 
436 #define RI(reg) (offsetof(struct user_regs_struct,reg) / sizeof(long))
437 
438 static unsigned long get_reg(struct pt_regs *regs, int num)
439 {
440         switch (num) {
441         case RI(gr[0]) ... RI(gr[31]):  return regs->gr[num - RI(gr[0])];
442         case RI(sr[0]) ... RI(sr[7]):   return regs->sr[num - RI(sr[0])];
443         case RI(iasq[0]):               return regs->iasq[0];
444         case RI(iasq[1]):               return regs->iasq[1];
445         case RI(iaoq[0]):               return regs->iaoq[0];
446         case RI(iaoq[1]):               return regs->iaoq[1];
447         case RI(sar):                   return regs->sar;
448         case RI(iir):                   return regs->iir;
449         case RI(isr):                   return regs->isr;
450         case RI(ior):                   return regs->ior;
451         case RI(ipsw):                  return regs->ipsw;
452         case RI(cr27):                  return regs->cr27;
453         case RI(cr0):                   return mfctl(0);
454         case RI(cr24):                  return mfctl(24);
455         case RI(cr25):                  return mfctl(25);
456         case RI(cr26):                  return mfctl(26);
457         case RI(cr28):                  return mfctl(28);
458         case RI(cr29):                  return mfctl(29);
459         case RI(cr30):                  return mfctl(30);
460         case RI(cr31):                  return mfctl(31);
461         case RI(cr8):                   return mfctl(8);
462         case RI(cr9):                   return mfctl(9);
463         case RI(cr12):                  return mfctl(12);
464         case RI(cr13):                  return mfctl(13);
465         case RI(cr10):                  return mfctl(10);
466         case RI(cr15):                  return mfctl(15);
467         default:                        return 0;
468         }
469 }
470 
471 static void set_reg(struct pt_regs *regs, int num, unsigned long val)
472 {
473         switch (num) {
474         case RI(gr[0]): /*
475                          * PSW is in gr[0].
476                          * Allow writing to Nullify, Divide-step-correction,
477                          * and carry/borrow bits.
478                          * BEWARE, if you set N, and then single step, it won't
479                          * stop on the nullified instruction.
480                          */
481                         val &= USER_PSW_BITS;
482                         regs->gr[0] &= ~USER_PSW_BITS;
483                         regs->gr[0] |= val;
484                         return;
485         case RI(gr[1]) ... RI(gr[31]):
486                         regs->gr[num - RI(gr[0])] = val;
487                         return;
488         case RI(iaoq[0]):
489         case RI(iaoq[1]):
490                         regs->iaoq[num - RI(iaoq[0])] = val;
491                         return;
492         case RI(sar):   regs->sar = val;
493                         return;
494         default:        return;
495 #if 0
496         /* do not allow to change any of the following registers (yet) */
497         case RI(sr[0]) ... RI(sr[7]):   return regs->sr[num - RI(sr[0])];
498         case RI(iasq[0]):               return regs->iasq[0];
499         case RI(iasq[1]):               return regs->iasq[1];
500         case RI(iir):                   return regs->iir;
501         case RI(isr):                   return regs->isr;
502         case RI(ior):                   return regs->ior;
503         case RI(ipsw):                  return regs->ipsw;
504         case RI(cr27):                  return regs->cr27;
505         case cr0, cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31;
506         case cr8, cr9, cr12, cr13, cr10, cr15;
507 #endif
508         }
509 }
510 
511 static int gpr_get(struct task_struct *target,
512                      const struct user_regset *regset,
513                      unsigned int pos, unsigned int count,
514                      void *kbuf, void __user *ubuf)
515 {
516         struct pt_regs *regs = task_regs(target);
517         unsigned long *k = kbuf;
518         unsigned long __user *u = ubuf;
519         unsigned long reg;
520 
521         pos /= sizeof(reg);
522         count /= sizeof(reg);
523 
524         if (kbuf)
525                 for (; count > 0 && pos < ELF_NGREG; --count)
526                         *k++ = get_reg(regs, pos++);
527         else
528                 for (; count > 0 && pos < ELF_NGREG; --count)
529                         if (__put_user(get_reg(regs, pos++), u++))
530                                 return -EFAULT;
531         kbuf = k;
532         ubuf = u;
533         pos *= sizeof(reg);
534         count *= sizeof(reg);
535         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
536                                         ELF_NGREG * sizeof(reg), -1);
537 }
538 
539 static int gpr_set(struct task_struct *target,
540                      const struct user_regset *regset,
541                      unsigned int pos, unsigned int count,
542                      const void *kbuf, const void __user *ubuf)
543 {
544         struct pt_regs *regs = task_regs(target);
545         const unsigned long *k = kbuf;
546         const unsigned long __user *u = ubuf;
547         unsigned long reg;
548 
549         pos /= sizeof(reg);
550         count /= sizeof(reg);
551 
552         if (kbuf)
553                 for (; count > 0 && pos < ELF_NGREG; --count)
554                         set_reg(regs, pos++, *k++);
555         else
556                 for (; count > 0 && pos < ELF_NGREG; --count) {
557                         if (__get_user(reg, u++))
558                                 return -EFAULT;
559                         set_reg(regs, pos++, reg);
560                 }
561 
562         kbuf = k;
563         ubuf = u;
564         pos *= sizeof(reg);
565         count *= sizeof(reg);
566         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
567                                          ELF_NGREG * sizeof(reg), -1);
568 }
569 
570 static const struct user_regset native_regsets[] = {
571         [REGSET_GENERAL] = {
572                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
573                 .size = sizeof(long), .align = sizeof(long),
574                 .get = gpr_get, .set = gpr_set
575         },
576         [REGSET_FP] = {
577                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
578                 .size = sizeof(__u64), .align = sizeof(__u64),
579                 .get = fpr_get, .set = fpr_set
580         }
581 };
582 
583 static const struct user_regset_view user_parisc_native_view = {
584         .name = "parisc", .e_machine = ELF_ARCH, .ei_osabi = ELFOSABI_LINUX,
585         .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
586 };
587 
588 #ifdef CONFIG_64BIT
589 #include <linux/compat.h>
590 
591 static int gpr32_get(struct task_struct *target,
592                      const struct user_regset *regset,
593                      unsigned int pos, unsigned int count,
594                      void *kbuf, void __user *ubuf)
595 {
596         struct pt_regs *regs = task_regs(target);
597         compat_ulong_t *k = kbuf;
598         compat_ulong_t __user *u = ubuf;
599         compat_ulong_t reg;
600 
601         pos /= sizeof(reg);
602         count /= sizeof(reg);
603 
604         if (kbuf)
605                 for (; count > 0 && pos < ELF_NGREG; --count)
606                         *k++ = get_reg(regs, pos++);
607         else
608                 for (; count > 0 && pos < ELF_NGREG; --count)
609                         if (__put_user((compat_ulong_t) get_reg(regs, pos++), u++))
610                                 return -EFAULT;
611 
612         kbuf = k;
613         ubuf = u;
614         pos *= sizeof(reg);
615         count *= sizeof(reg);
616         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
617                                         ELF_NGREG * sizeof(reg), -1);
618 }
619 
620 static int gpr32_set(struct task_struct *target,
621                      const struct user_regset *regset,
622                      unsigned int pos, unsigned int count,
623                      const void *kbuf, const void __user *ubuf)
624 {
625         struct pt_regs *regs = task_regs(target);
626         const compat_ulong_t *k = kbuf;
627         const compat_ulong_t __user *u = ubuf;
628         compat_ulong_t reg;
629 
630         pos /= sizeof(reg);
631         count /= sizeof(reg);
632 
633         if (kbuf)
634                 for (; count > 0 && pos < ELF_NGREG; --count)
635                         set_reg(regs, pos++, *k++);
636         else
637                 for (; count > 0 && pos < ELF_NGREG; --count) {
638                         if (__get_user(reg, u++))
639                                 return -EFAULT;
640                         set_reg(regs, pos++, reg);
641                 }
642 
643         kbuf = k;
644         ubuf = u;
645         pos *= sizeof(reg);
646         count *= sizeof(reg);
647         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
648                                          ELF_NGREG * sizeof(reg), -1);
649 }
650 
651 /*
652  * These are the regset flavors matching the 32bit native set.
653  */
654 static const struct user_regset compat_regsets[] = {
655         [REGSET_GENERAL] = {
656                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
657                 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
658                 .get = gpr32_get, .set = gpr32_set
659         },
660         [REGSET_FP] = {
661                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
662                 .size = sizeof(__u64), .align = sizeof(__u64),
663                 .get = fpr_get, .set = fpr_set
664         }
665 };
666 
667 static const struct user_regset_view user_parisc_compat_view = {
668         .name = "parisc", .e_machine = EM_PARISC, .ei_osabi = ELFOSABI_LINUX,
669         .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
670 };
671 #endif  /* CONFIG_64BIT */
672 
673 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
674 {
675         BUILD_BUG_ON(sizeof(struct user_regs_struct)/sizeof(long) != ELF_NGREG);
676         BUILD_BUG_ON(sizeof(struct user_fp_struct)/sizeof(__u64) != ELF_NFPREG);
677 #ifdef CONFIG_64BIT
678         if (is_compat_task())
679                 return &user_parisc_compat_view;
680 #endif
681         return &user_parisc_native_view;
682 }
683 

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