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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/processor.h>
30#include <asm/asm-offsets.h>
31
32
33#define USER_PSW_BITS (PSW_N | PSW_B | PSW_V | PSW_CB)
34
35#define CREATE_TRACE_POINTS
36#include <trace/events/syscalls.h>
37
38
39
40
41enum parisc_regset {
42 REGSET_GENERAL,
43 REGSET_FP
44};
45
46
47
48
49
50
51void ptrace_disable(struct task_struct *task)
52{
53 clear_tsk_thread_flag(task, TIF_SINGLESTEP);
54 clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
55
56
57 pa_psw(task)->r = 0;
58 pa_psw(task)->t = 0;
59 pa_psw(task)->h = 0;
60 pa_psw(task)->l = 0;
61}
62
63
64
65
66
67void user_disable_single_step(struct task_struct *task)
68{
69 ptrace_disable(task);
70}
71
72void user_enable_single_step(struct task_struct *task)
73{
74 clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
75 set_tsk_thread_flag(task, TIF_SINGLESTEP);
76
77 if (pa_psw(task)->n) {
78
79 task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1];
80 task_regs(task)->iasq[0] = task_regs(task)->iasq[1];
81 task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4;
82 pa_psw(task)->n = 0;
83 pa_psw(task)->x = 0;
84 pa_psw(task)->y = 0;
85 pa_psw(task)->z = 0;
86 pa_psw(task)->b = 0;
87 ptrace_disable(task);
88
89
90 force_sig_fault_to_task(SIGTRAP, TRAP_TRACE,
91 (void __user *) (task_regs(task)->iaoq[0] & ~3),
92 task);
93
94 return;
95 }
96
97
98
99
100
101
102
103
104
105 pa_psw(task)->r = 1;
106 pa_psw(task)->t = 0;
107 pa_psw(task)->h = 0;
108 pa_psw(task)->l = 0;
109}
110
111void user_enable_block_step(struct task_struct *task)
112{
113 clear_tsk_thread_flag(task, TIF_SINGLESTEP);
114 set_tsk_thread_flag(task, TIF_BLOCKSTEP);
115
116
117 pa_psw(task)->r = 0;
118 pa_psw(task)->t = 1;
119 pa_psw(task)->h = 0;
120 pa_psw(task)->l = 0;
121}
122
123long arch_ptrace(struct task_struct *child, long request,
124 unsigned long addr, unsigned long data)
125{
126 unsigned long __user *datap = (unsigned long __user *)data;
127 unsigned long tmp;
128 long ret = -EIO;
129
130 switch (request) {
131
132
133
134 case PTRACE_PEEKUSR:
135 if ((addr & (sizeof(unsigned long)-1)) ||
136 addr >= sizeof(struct pt_regs))
137 break;
138 tmp = *(unsigned long *) ((char *) task_regs(child) + addr);
139 ret = put_user(tmp, datap);
140 break;
141
142
143
144
145
146
147
148 case PTRACE_POKEUSR:
149
150
151
152
153 if (addr == PT_PSW) {
154
155
156
157
158
159 data &= USER_PSW_BITS;
160 task_regs(child)->gr[0] &= ~USER_PSW_BITS;
161 task_regs(child)->gr[0] |= data;
162 ret = 0;
163 break;
164 }
165
166 if ((addr & (sizeof(unsigned long)-1)) ||
167 addr >= sizeof(struct pt_regs))
168 break;
169 if (addr == PT_IAOQ0 || addr == PT_IAOQ1) {
170 data |= 3;
171 }
172 if ((addr >= PT_GR1 && addr <= PT_GR31) ||
173 addr == PT_IAOQ0 || addr == PT_IAOQ1 ||
174 (addr >= PT_FR0 && addr <= PT_FR31 + 4) ||
175 addr == PT_SAR) {
176 *(unsigned long *) ((char *) task_regs(child) + addr) = data;
177 ret = 0;
178 }
179 break;
180
181 case PTRACE_GETREGS:
182 return copy_regset_to_user(child,
183 task_user_regset_view(current),
184 REGSET_GENERAL,
185 0, sizeof(struct user_regs_struct),
186 datap);
187
188 case PTRACE_SETREGS:
189 return copy_regset_from_user(child,
190 task_user_regset_view(current),
191 REGSET_GENERAL,
192 0, sizeof(struct user_regs_struct),
193 datap);
194
195 case PTRACE_GETFPREGS:
196 return copy_regset_to_user(child,
197 task_user_regset_view(current),
198 REGSET_FP,
199 0, sizeof(struct user_fp_struct),
200 datap);
201
202 case PTRACE_SETFPREGS:
203 return copy_regset_from_user(child,
204 task_user_regset_view(current),
205 REGSET_FP,
206 0, sizeof(struct user_fp_struct),
207 datap);
208
209 default:
210 ret = ptrace_request(child, request, addr, data);
211 break;
212 }
213
214 return ret;
215}
216
217
218#ifdef CONFIG_COMPAT
219
220
221
222
223
224
225
226
227
228
229
230
231static compat_ulong_t translate_usr_offset(compat_ulong_t offset)
232{
233 compat_ulong_t pos;
234
235 if (offset < 32*4)
236 pos = offset * 2 + 4;
237 else if (offset < 32*4+32*8)
238 pos = (offset - 32*4) + PT_FR0;
239 else if (offset < sizeof(struct pt_regs)/2 + 32*4)
240 pos = (offset - 32*4 - 32*8) * 2 + PT_SR0 + 4;
241 else
242 pos = sizeof(struct pt_regs);
243
244 return pos;
245}
246
247long 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
267
268
269
270
271
272 case PTRACE_POKEUSR:
273
274
275
276
277 if (addr == PT_PSW) {
278
279
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_IAOQ0+4 || addr == PT_IAOQ1+4) {
289 data |= 3;
290 }
291 if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
292
293 *(__u32 *) ((char *) task_regs(child) + addr) = data;
294 ret = 0;
295 }
296 else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) ||
297 addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 ||
298 addr == PT_SAR+4) {
299
300 *(__u32 *) ((char *) task_regs(child) + addr - 4) = 0;
301 *(__u32 *) ((char *) task_regs(child) + addr) = data;
302 ret = 0;
303 }
304 }
305 break;
306
307 default:
308 ret = compat_ptrace_request(child, request, addr, data);
309 break;
310 }
311
312 return ret;
313}
314#endif
315
316long do_syscall_trace_enter(struct pt_regs *regs)
317{
318 if (test_thread_flag(TIF_SYSCALL_TRACE)) {
319 int rc = tracehook_report_syscall_entry(regs);
320
321
322
323
324
325 regs->gr[28] = -ENOSYS;
326
327 if (rc) {
328
329
330
331
332
333
334
335
336
337
338 regs->gr[20] = -1UL;
339 return -1;
340 }
341 }
342
343
344 if (secure_computing() == -1)
345 return -1;
346
347#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
348 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
349 trace_sys_enter(regs, regs->gr[20]);
350#endif
351
352#ifdef CONFIG_64BIT
353 if (!is_compat_task())
354 audit_syscall_entry(regs->gr[20], regs->gr[26], regs->gr[25],
355 regs->gr[24], regs->gr[23]);
356 else
357#endif
358 audit_syscall_entry(regs->gr[20] & 0xffffffff,
359 regs->gr[26] & 0xffffffff,
360 regs->gr[25] & 0xffffffff,
361 regs->gr[24] & 0xffffffff,
362 regs->gr[23] & 0xffffffff);
363
364
365
366
367
368 return (int) ((u32) regs->gr[20]);
369}
370
371void do_syscall_trace_exit(struct pt_regs *regs)
372{
373 int stepping = test_thread_flag(TIF_SINGLESTEP) ||
374 test_thread_flag(TIF_BLOCKSTEP);
375
376 audit_syscall_exit(regs);
377
378#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
379 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
380 trace_sys_exit(regs, regs->gr[20]);
381#endif
382
383 if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
384 tracehook_report_syscall_exit(regs, stepping);
385}
386
387
388
389
390
391
392static int fpr_get(struct task_struct *target,
393 const struct user_regset *regset,
394 struct membuf to)
395{
396 struct pt_regs *regs = task_regs(target);
397
398 return membuf_write(&to, regs->fr, ELF_NFPREG * sizeof(__u64));
399}
400
401static int fpr_set(struct task_struct *target,
402 const struct user_regset *regset,
403 unsigned int pos, unsigned int count,
404 const void *kbuf, const void __user *ubuf)
405{
406 struct pt_regs *regs = task_regs(target);
407 const __u64 *k = kbuf;
408 const __u64 __user *u = ubuf;
409 __u64 reg;
410
411 pos /= sizeof(reg);
412 count /= sizeof(reg);
413
414 if (kbuf)
415 for (; count > 0 && pos < ELF_NFPREG; --count)
416 regs->fr[pos++] = *k++;
417 else
418 for (; count > 0 && pos < ELF_NFPREG; --count) {
419 if (__get_user(reg, u++))
420 return -EFAULT;
421 regs->fr[pos++] = reg;
422 }
423
424 kbuf = k;
425 ubuf = u;
426 pos *= sizeof(reg);
427 count *= sizeof(reg);
428 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
429 ELF_NFPREG * sizeof(reg), -1);
430}
431
432#define RI(reg) (offsetof(struct user_regs_struct,reg) / sizeof(long))
433
434static unsigned long get_reg(struct pt_regs *regs, int num)
435{
436 switch (num) {
437 case RI(gr[0]) ... RI(gr[31]): return regs->gr[num - RI(gr[0])];
438 case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])];
439 case RI(iasq[0]): return regs->iasq[0];
440 case RI(iasq[1]): return regs->iasq[1];
441 case RI(iaoq[0]): return regs->iaoq[0];
442 case RI(iaoq[1]): return regs->iaoq[1];
443 case RI(sar): return regs->sar;
444 case RI(iir): return regs->iir;
445 case RI(isr): return regs->isr;
446 case RI(ior): return regs->ior;
447 case RI(ipsw): return regs->ipsw;
448 case RI(cr27): return regs->cr27;
449 case RI(cr0): return mfctl(0);
450 case RI(cr24): return mfctl(24);
451 case RI(cr25): return mfctl(25);
452 case RI(cr26): return mfctl(26);
453 case RI(cr28): return mfctl(28);
454 case RI(cr29): return mfctl(29);
455 case RI(cr30): return mfctl(30);
456 case RI(cr31): return mfctl(31);
457 case RI(cr8): return mfctl(8);
458 case RI(cr9): return mfctl(9);
459 case RI(cr12): return mfctl(12);
460 case RI(cr13): return mfctl(13);
461 case RI(cr10): return mfctl(10);
462 case RI(cr15): return mfctl(15);
463 default: return 0;
464 }
465}
466
467static void set_reg(struct pt_regs *regs, int num, unsigned long val)
468{
469 switch (num) {
470 case RI(gr[0]):
471
472
473
474
475
476
477 val &= USER_PSW_BITS;
478 regs->gr[0] &= ~USER_PSW_BITS;
479 regs->gr[0] |= val;
480 return;
481 case RI(gr[1]) ... RI(gr[31]):
482 regs->gr[num - RI(gr[0])] = val;
483 return;
484 case RI(iaoq[0]):
485 case RI(iaoq[1]):
486
487 regs->iaoq[num - RI(iaoq[0])] = val | 3;
488 return;
489 case RI(sar): regs->sar = val;
490 return;
491 default: return;
492#if 0
493
494 case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])];
495 case RI(iasq[0]): return regs->iasq[0];
496 case RI(iasq[1]): return regs->iasq[1];
497 case RI(iir): return regs->iir;
498 case RI(isr): return regs->isr;
499 case RI(ior): return regs->ior;
500 case RI(ipsw): return regs->ipsw;
501 case RI(cr27): return regs->cr27;
502 case cr0, cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31;
503 case cr8, cr9, cr12, cr13, cr10, cr15;
504#endif
505 }
506}
507
508static int gpr_get(struct task_struct *target,
509 const struct user_regset *regset,
510 struct membuf to)
511{
512 struct pt_regs *regs = task_regs(target);
513 unsigned int pos;
514
515 for (pos = 0; pos < ELF_NGREG; pos++)
516 membuf_store(&to, get_reg(regs, pos));
517 return 0;
518}
519
520static int gpr_set(struct task_struct *target,
521 const struct user_regset *regset,
522 unsigned int pos, unsigned int count,
523 const void *kbuf, const void __user *ubuf)
524{
525 struct pt_regs *regs = task_regs(target);
526 const unsigned long *k = kbuf;
527 const unsigned long __user *u = ubuf;
528 unsigned long reg;
529
530 pos /= sizeof(reg);
531 count /= sizeof(reg);
532
533 if (kbuf)
534 for (; count > 0 && pos < ELF_NGREG; --count)
535 set_reg(regs, pos++, *k++);
536 else
537 for (; count > 0 && pos < ELF_NGREG; --count) {
538 if (__get_user(reg, u++))
539 return -EFAULT;
540 set_reg(regs, pos++, reg);
541 }
542
543 kbuf = k;
544 ubuf = u;
545 pos *= sizeof(reg);
546 count *= sizeof(reg);
547 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
548 ELF_NGREG * sizeof(reg), -1);
549}
550
551static const struct user_regset native_regsets[] = {
552 [REGSET_GENERAL] = {
553 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
554 .size = sizeof(long), .align = sizeof(long),
555 .regset_get = gpr_get, .set = gpr_set
556 },
557 [REGSET_FP] = {
558 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
559 .size = sizeof(__u64), .align = sizeof(__u64),
560 .regset_get = fpr_get, .set = fpr_set
561 }
562};
563
564static const struct user_regset_view user_parisc_native_view = {
565 .name = "parisc", .e_machine = ELF_ARCH, .ei_osabi = ELFOSABI_LINUX,
566 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
567};
568
569#ifdef CONFIG_64BIT
570#include <linux/compat.h>
571
572static int gpr32_get(struct task_struct *target,
573 const struct user_regset *regset,
574 struct membuf to)
575{
576 struct pt_regs *regs = task_regs(target);
577 unsigned int pos;
578
579 for (pos = 0; pos < ELF_NGREG; pos++)
580 membuf_store(&to, (compat_ulong_t)get_reg(regs, pos));
581
582 return 0;
583}
584
585static int gpr32_set(struct task_struct *target,
586 const struct user_regset *regset,
587 unsigned int pos, unsigned int count,
588 const void *kbuf, const void __user *ubuf)
589{
590 struct pt_regs *regs = task_regs(target);
591 const compat_ulong_t *k = kbuf;
592 const compat_ulong_t __user *u = ubuf;
593 compat_ulong_t reg;
594
595 pos /= sizeof(reg);
596 count /= sizeof(reg);
597
598 if (kbuf)
599 for (; count > 0 && pos < ELF_NGREG; --count)
600 set_reg(regs, pos++, *k++);
601 else
602 for (; count > 0 && pos < ELF_NGREG; --count) {
603 if (__get_user(reg, u++))
604 return -EFAULT;
605 set_reg(regs, pos++, reg);
606 }
607
608 kbuf = k;
609 ubuf = u;
610 pos *= sizeof(reg);
611 count *= sizeof(reg);
612 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
613 ELF_NGREG * sizeof(reg), -1);
614}
615
616
617
618
619static const struct user_regset compat_regsets[] = {
620 [REGSET_GENERAL] = {
621 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
622 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
623 .regset_get = gpr32_get, .set = gpr32_set
624 },
625 [REGSET_FP] = {
626 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
627 .size = sizeof(__u64), .align = sizeof(__u64),
628 .regset_get = fpr_get, .set = fpr_set
629 }
630};
631
632static const struct user_regset_view user_parisc_compat_view = {
633 .name = "parisc", .e_machine = EM_PARISC, .ei_osabi = ELFOSABI_LINUX,
634 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
635};
636#endif
637
638const struct user_regset_view *task_user_regset_view(struct task_struct *task)
639{
640 BUILD_BUG_ON(sizeof(struct user_regs_struct)/sizeof(long) != ELF_NGREG);
641 BUILD_BUG_ON(sizeof(struct user_fp_struct)/sizeof(__u64) != ELF_NFPREG);
642#ifdef CONFIG_64BIT
643 if (is_compat_task())
644 return &user_parisc_compat_view;
645#endif
646 return &user_parisc_native_view;
647}
648
649
650
651
652struct pt_regs_offset {
653 const char *name;
654 int offset;
655};
656
657#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
658#define REG_OFFSET_INDEX(r,i) {.name = #r#i, .offset = offsetof(struct pt_regs, r[i])}
659#define REG_OFFSET_END {.name = NULL, .offset = 0}
660
661static const struct pt_regs_offset regoffset_table[] = {
662 REG_OFFSET_INDEX(gr,0),
663 REG_OFFSET_INDEX(gr,1),
664 REG_OFFSET_INDEX(gr,2),
665 REG_OFFSET_INDEX(gr,3),
666 REG_OFFSET_INDEX(gr,4),
667 REG_OFFSET_INDEX(gr,5),
668 REG_OFFSET_INDEX(gr,6),
669 REG_OFFSET_INDEX(gr,7),
670 REG_OFFSET_INDEX(gr,8),
671 REG_OFFSET_INDEX(gr,9),
672 REG_OFFSET_INDEX(gr,10),
673 REG_OFFSET_INDEX(gr,11),
674 REG_OFFSET_INDEX(gr,12),
675 REG_OFFSET_INDEX(gr,13),
676 REG_OFFSET_INDEX(gr,14),
677 REG_OFFSET_INDEX(gr,15),
678 REG_OFFSET_INDEX(gr,16),
679 REG_OFFSET_INDEX(gr,17),
680 REG_OFFSET_INDEX(gr,18),
681 REG_OFFSET_INDEX(gr,19),
682 REG_OFFSET_INDEX(gr,20),
683 REG_OFFSET_INDEX(gr,21),
684 REG_OFFSET_INDEX(gr,22),
685 REG_OFFSET_INDEX(gr,23),
686 REG_OFFSET_INDEX(gr,24),
687 REG_OFFSET_INDEX(gr,25),
688 REG_OFFSET_INDEX(gr,26),
689 REG_OFFSET_INDEX(gr,27),
690 REG_OFFSET_INDEX(gr,28),
691 REG_OFFSET_INDEX(gr,29),
692 REG_OFFSET_INDEX(gr,30),
693 REG_OFFSET_INDEX(gr,31),
694 REG_OFFSET_INDEX(sr,0),
695 REG_OFFSET_INDEX(sr,1),
696 REG_OFFSET_INDEX(sr,2),
697 REG_OFFSET_INDEX(sr,3),
698 REG_OFFSET_INDEX(sr,4),
699 REG_OFFSET_INDEX(sr,5),
700 REG_OFFSET_INDEX(sr,6),
701 REG_OFFSET_INDEX(sr,7),
702 REG_OFFSET_INDEX(iasq,0),
703 REG_OFFSET_INDEX(iasq,1),
704 REG_OFFSET_INDEX(iaoq,0),
705 REG_OFFSET_INDEX(iaoq,1),
706 REG_OFFSET_NAME(cr27),
707 REG_OFFSET_NAME(ksp),
708 REG_OFFSET_NAME(kpc),
709 REG_OFFSET_NAME(sar),
710 REG_OFFSET_NAME(iir),
711 REG_OFFSET_NAME(isr),
712 REG_OFFSET_NAME(ior),
713 REG_OFFSET_NAME(ipsw),
714 REG_OFFSET_END,
715};
716
717
718
719
720
721
722
723
724int regs_query_register_offset(const char *name)
725{
726 const struct pt_regs_offset *roff;
727 for (roff = regoffset_table; roff->name != NULL; roff++)
728 if (!strcmp(roff->name, name))
729 return roff->offset;
730 return -EINVAL;
731}
732
733
734
735
736
737
738
739
740const char *regs_query_register_name(unsigned int offset)
741{
742 const struct pt_regs_offset *roff;
743 for (roff = regoffset_table; roff->name != NULL; roff++)
744 if (roff->offset == offset)
745 return roff->name;
746 return NULL;
747}
748
749
750
751
752
753
754
755
756
757int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
758{
759 return ((addr & ~(THREAD_SIZE - 1)) ==
760 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
761}
762
763
764
765
766
767
768
769
770
771
772unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
773{
774 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
775
776 addr -= n;
777
778 if (!regs_within_kernel_stack(regs, (unsigned long)addr))
779 return 0;
780
781 return *addr;
782}
783