Loading...
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 */
42enum 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 */
52void 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 */
68void user_disable_single_step(struct task_struct *task)
69{
70 ptrace_disable(task);
71}
72
73void 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 /* Nullified, just crank over the queue. */
80 task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1];
81 task_regs(task)->iasq[0] = task_regs(task)->iasq[1];
82 task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4;
83 pa_psw(task)->n = 0;
84 pa_psw(task)->x = 0;
85 pa_psw(task)->y = 0;
86 pa_psw(task)->z = 0;
87 pa_psw(task)->b = 0;
88 ptrace_disable(task);
89 /* Don't wake up the task, but let the
90 parent know something happened. */
91 force_sig_fault_to_task(SIGTRAP, TRAP_TRACE,
92 (void __user *) (task_regs(task)->iaoq[0] & ~3),
93 task);
94 /* notify_parent(task, SIGCHLD); */
95 return;
96 }
97
98 /* Enable recovery counter traps. The recovery counter
99 * itself will be set to zero on a task switch. If the
100 * task is suspended on a syscall then the syscall return
101 * path will overwrite the recovery counter with a suitable
102 * value such that it traps once back in user space. We
103 * disable interrupts in the tasks PSW here also, to avoid
104 * interrupts while the recovery counter is decrementing.
105 */
106 pa_psw(task)->r = 1;
107 pa_psw(task)->t = 0;
108 pa_psw(task)->h = 0;
109 pa_psw(task)->l = 0;
110}
111
112void user_enable_block_step(struct task_struct *task)
113{
114 clear_tsk_thread_flag(task, TIF_SINGLESTEP);
115 set_tsk_thread_flag(task, TIF_BLOCKSTEP);
116
117 /* Enable taken branch trap. */
118 pa_psw(task)->r = 0;
119 pa_psw(task)->t = 1;
120 pa_psw(task)->h = 0;
121 pa_psw(task)->l = 0;
122}
123
124long arch_ptrace(struct task_struct *child, long request,
125 unsigned long addr, unsigned long data)
126{
127 unsigned long __user *datap = (unsigned long __user *)data;
128 unsigned long tmp;
129 long ret = -EIO;
130
131 switch (request) {
132
133 /* Read the word at location addr in the USER area. For ptraced
134 processes, the kernel saves all regs on a syscall. */
135 case PTRACE_PEEKUSR:
136 if ((addr & (sizeof(unsigned long)-1)) ||
137 addr >= sizeof(struct pt_regs))
138 break;
139 tmp = *(unsigned long *) ((char *) task_regs(child) + addr);
140 ret = put_user(tmp, datap);
141 break;
142
143 /* Write the word at location addr in the USER area. This will need
144 to change when the kernel no longer saves all regs on a syscall.
145 FIXME. There is a problem at the moment in that r3-r18 are only
146 saved if the process is ptraced on syscall entry, and even then
147 those values are overwritten by actual register values on syscall
148 exit. */
149 case PTRACE_POKEUSR:
150 /* Some register values written here may be ignored in
151 * entry.S:syscall_restore_rfi; e.g. iaoq is written with
152 * r31/r31+4, and not with the values in pt_regs.
153 */
154 if (addr == PT_PSW) {
155 /* Allow writing to Nullify, Divide-step-correction,
156 * and carry/borrow bits.
157 * BEWARE, if you set N, and then single step, it won't
158 * stop on the nullified instruction.
159 */
160 data &= USER_PSW_BITS;
161 task_regs(child)->gr[0] &= ~USER_PSW_BITS;
162 task_regs(child)->gr[0] |= data;
163 ret = 0;
164 break;
165 }
166
167 if ((addr & (sizeof(unsigned long)-1)) ||
168 addr >= sizeof(struct pt_regs))
169 break;
170 if (addr == PT_IAOQ0 || addr == PT_IAOQ1) {
171 data |= 3; /* ensure userspace privilege */
172 }
173 if ((addr >= PT_GR1 && addr <= PT_GR31) ||
174 addr == PT_IAOQ0 || addr == PT_IAOQ1 ||
175 (addr >= PT_FR0 && addr <= PT_FR31 + 4) ||
176 addr == PT_SAR) {
177 *(unsigned long *) ((char *) task_regs(child) + addr) = data;
178 ret = 0;
179 }
180 break;
181
182 case PTRACE_GETREGS: /* Get all gp regs from the child. */
183 return copy_regset_to_user(child,
184 task_user_regset_view(current),
185 REGSET_GENERAL,
186 0, sizeof(struct user_regs_struct),
187 datap);
188
189 case PTRACE_SETREGS: /* Set all gp regs in the child. */
190 return copy_regset_from_user(child,
191 task_user_regset_view(current),
192 REGSET_GENERAL,
193 0, sizeof(struct user_regs_struct),
194 datap);
195
196 case PTRACE_GETFPREGS: /* Get the child FPU state. */
197 return copy_regset_to_user(child,
198 task_user_regset_view(current),
199 REGSET_FP,
200 0, sizeof(struct user_fp_struct),
201 datap);
202
203 case PTRACE_SETFPREGS: /* Set the child FPU state. */
204 return copy_regset_from_user(child,
205 task_user_regset_view(current),
206 REGSET_FP,
207 0, sizeof(struct user_fp_struct),
208 datap);
209
210 default:
211 ret = ptrace_request(child, request, addr, data);
212 break;
213 }
214
215 return ret;
216}
217
218
219#ifdef CONFIG_COMPAT
220
221/* This function is needed to translate 32 bit pt_regs offsets in to
222 * 64 bit pt_regs offsets. For example, a 32 bit gdb under a 64 bit kernel
223 * will request offset 12 if it wants gr3, but the lower 32 bits of
224 * the 64 bit kernels view of gr3 will be at offset 28 (3*8 + 4).
225 * This code relies on a 32 bit pt_regs being comprised of 32 bit values
226 * except for the fp registers which (a) are 64 bits, and (b) follow
227 * the gr registers at the start of pt_regs. The 32 bit pt_regs should
228 * be half the size of the 64 bit pt_regs, plus 32*4 to allow for fr[]
229 * being 64 bit in both cases.
230 */
231
232static compat_ulong_t translate_usr_offset(compat_ulong_t offset)
233{
234 compat_ulong_t pos;
235
236 if (offset < 32*4) /* gr[0..31] */
237 pos = offset * 2 + 4;
238 else if (offset < 32*4+32*8) /* fr[0] ... fr[31] */
239 pos = (offset - 32*4) + PT_FR0;
240 else if (offset < sizeof(struct pt_regs)/2 + 32*4) /* sr[0] ... ipsw */
241 pos = (offset - 32*4 - 32*8) * 2 + PT_SR0 + 4;
242 else
243 pos = sizeof(struct pt_regs);
244
245 return pos;
246}
247
248long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
249 compat_ulong_t addr, compat_ulong_t data)
250{
251 compat_uint_t tmp;
252 long ret = -EIO;
253
254 switch (request) {
255
256 case PTRACE_PEEKUSR:
257 if (addr & (sizeof(compat_uint_t)-1))
258 break;
259 addr = translate_usr_offset(addr);
260 if (addr >= sizeof(struct pt_regs))
261 break;
262
263 tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr);
264 ret = put_user(tmp, (compat_uint_t *) (unsigned long) data);
265 break;
266
267 /* Write the word at location addr in the USER area. This will need
268 to change when the kernel no longer saves all regs on a syscall.
269 FIXME. There is a problem at the moment in that r3-r18 are only
270 saved if the process is ptraced on syscall entry, and even then
271 those values are overwritten by actual register values on syscall
272 exit. */
273 case PTRACE_POKEUSR:
274 /* Some register values written here may be ignored in
275 * entry.S:syscall_restore_rfi; e.g. iaoq is written with
276 * r31/r31+4, and not with the values in pt_regs.
277 */
278 if (addr == PT_PSW) {
279 /* Since PT_PSW==0, it is valid for 32 bit processes
280 * under 64 bit kernels as well.
281 */
282 ret = arch_ptrace(child, request, addr, data);
283 } else {
284 if (addr & (sizeof(compat_uint_t)-1))
285 break;
286 addr = translate_usr_offset(addr);
287 if (addr >= sizeof(struct pt_regs))
288 break;
289 if (addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4) {
290 data |= 3; /* ensure userspace privilege */
291 }
292 if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
293 /* Special case, fp regs are 64 bits anyway */
294 *(__u32 *) ((char *) task_regs(child) + addr) = data;
295 ret = 0;
296 }
297 else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) ||
298 addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 ||
299 addr == PT_SAR+4) {
300 /* Zero the top 32 bits */
301 *(__u32 *) ((char *) task_regs(child) + addr - 4) = 0;
302 *(__u32 *) ((char *) task_regs(child) + addr) = data;
303 ret = 0;
304 }
305 }
306 break;
307
308 default:
309 ret = compat_ptrace_request(child, request, addr, data);
310 break;
311 }
312
313 return ret;
314}
315#endif
316
317long do_syscall_trace_enter(struct pt_regs *regs)
318{
319 if (test_thread_flag(TIF_SYSCALL_TRACE)) {
320 int rc = tracehook_report_syscall_entry(regs);
321
322 /*
323 * As tracesys_next does not set %r28 to -ENOSYS
324 * when %r20 is set to -1, initialize it here.
325 */
326 regs->gr[28] = -ENOSYS;
327
328 if (rc) {
329 /*
330 * A nonzero return code from
331 * tracehook_report_syscall_entry() tells us
332 * to prevent the syscall execution. Skip
333 * the syscall call and the syscall restart handling.
334 *
335 * Note that the tracer may also just change
336 * regs->gr[20] to an invalid syscall number,
337 * that is handled by tracesys_next.
338 */
339 regs->gr[20] = -1UL;
340 return -1;
341 }
342 }
343
344 /* Do the secure computing check after ptrace. */
345 if (secure_computing(NULL) == -1)
346 return -1;
347
348#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
349 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
350 trace_sys_enter(regs, regs->gr[20]);
351#endif
352
353#ifdef CONFIG_64BIT
354 if (!is_compat_task())
355 audit_syscall_entry(regs->gr[20], regs->gr[26], regs->gr[25],
356 regs->gr[24], regs->gr[23]);
357 else
358#endif
359 audit_syscall_entry(regs->gr[20] & 0xffffffff,
360 regs->gr[26] & 0xffffffff,
361 regs->gr[25] & 0xffffffff,
362 regs->gr[24] & 0xffffffff,
363 regs->gr[23] & 0xffffffff);
364
365 /*
366 * Sign extend the syscall number to 64bit since it may have been
367 * modified by a compat ptrace call
368 */
369 return (int) ((u32) regs->gr[20]);
370}
371
372void do_syscall_trace_exit(struct pt_regs *regs)
373{
374 int stepping = test_thread_flag(TIF_SINGLESTEP) ||
375 test_thread_flag(TIF_BLOCKSTEP);
376
377 audit_syscall_exit(regs);
378
379#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
380 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
381 trace_sys_exit(regs, regs->gr[20]);
382#endif
383
384 if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
385 tracehook_report_syscall_exit(regs, stepping);
386}
387
388
389/*
390 * regset functions.
391 */
392
393static int fpr_get(struct task_struct *target,
394 const struct user_regset *regset,
395 unsigned int pos, unsigned int count,
396 void *kbuf, void __user *ubuf)
397{
398 struct pt_regs *regs = task_regs(target);
399 __u64 *k = kbuf;
400 __u64 __user *u = ubuf;
401 __u64 reg;
402
403 pos /= sizeof(reg);
404 count /= sizeof(reg);
405
406 if (kbuf)
407 for (; count > 0 && pos < ELF_NFPREG; --count)
408 *k++ = regs->fr[pos++];
409 else
410 for (; count > 0 && pos < ELF_NFPREG; --count)
411 if (__put_user(regs->fr[pos++], u++))
412 return -EFAULT;
413
414 kbuf = k;
415 ubuf = u;
416 pos *= sizeof(reg);
417 count *= sizeof(reg);
418 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
419 ELF_NFPREG * sizeof(reg), -1);
420}
421
422static int fpr_set(struct task_struct *target,
423 const struct user_regset *regset,
424 unsigned int pos, unsigned int count,
425 const void *kbuf, const void __user *ubuf)
426{
427 struct pt_regs *regs = task_regs(target);
428 const __u64 *k = kbuf;
429 const __u64 __user *u = ubuf;
430 __u64 reg;
431
432 pos /= sizeof(reg);
433 count /= sizeof(reg);
434
435 if (kbuf)
436 for (; count > 0 && pos < ELF_NFPREG; --count)
437 regs->fr[pos++] = *k++;
438 else
439 for (; count > 0 && pos < ELF_NFPREG; --count) {
440 if (__get_user(reg, u++))
441 return -EFAULT;
442 regs->fr[pos++] = reg;
443 }
444
445 kbuf = k;
446 ubuf = u;
447 pos *= sizeof(reg);
448 count *= sizeof(reg);
449 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
450 ELF_NFPREG * sizeof(reg), -1);
451}
452
453#define RI(reg) (offsetof(struct user_regs_struct,reg) / sizeof(long))
454
455static unsigned long get_reg(struct pt_regs *regs, int num)
456{
457 switch (num) {
458 case RI(gr[0]) ... RI(gr[31]): return regs->gr[num - RI(gr[0])];
459 case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])];
460 case RI(iasq[0]): return regs->iasq[0];
461 case RI(iasq[1]): return regs->iasq[1];
462 case RI(iaoq[0]): return regs->iaoq[0];
463 case RI(iaoq[1]): return regs->iaoq[1];
464 case RI(sar): return regs->sar;
465 case RI(iir): return regs->iir;
466 case RI(isr): return regs->isr;
467 case RI(ior): return regs->ior;
468 case RI(ipsw): return regs->ipsw;
469 case RI(cr27): return regs->cr27;
470 case RI(cr0): return mfctl(0);
471 case RI(cr24): return mfctl(24);
472 case RI(cr25): return mfctl(25);
473 case RI(cr26): return mfctl(26);
474 case RI(cr28): return mfctl(28);
475 case RI(cr29): return mfctl(29);
476 case RI(cr30): return mfctl(30);
477 case RI(cr31): return mfctl(31);
478 case RI(cr8): return mfctl(8);
479 case RI(cr9): return mfctl(9);
480 case RI(cr12): return mfctl(12);
481 case RI(cr13): return mfctl(13);
482 case RI(cr10): return mfctl(10);
483 case RI(cr15): return mfctl(15);
484 default: return 0;
485 }
486}
487
488static void set_reg(struct pt_regs *regs, int num, unsigned long val)
489{
490 switch (num) {
491 case RI(gr[0]): /*
492 * PSW is in gr[0].
493 * Allow writing to Nullify, Divide-step-correction,
494 * and carry/borrow bits.
495 * BEWARE, if you set N, and then single step, it won't
496 * stop on the nullified instruction.
497 */
498 val &= USER_PSW_BITS;
499 regs->gr[0] &= ~USER_PSW_BITS;
500 regs->gr[0] |= val;
501 return;
502 case RI(gr[1]) ... RI(gr[31]):
503 regs->gr[num - RI(gr[0])] = val;
504 return;
505 case RI(iaoq[0]):
506 case RI(iaoq[1]):
507 /* set 2 lowest bits to ensure userspace privilege: */
508 regs->iaoq[num - RI(iaoq[0])] = val | 3;
509 return;
510 case RI(sar): regs->sar = val;
511 return;
512 default: return;
513#if 0
514 /* do not allow to change any of the following registers (yet) */
515 case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])];
516 case RI(iasq[0]): return regs->iasq[0];
517 case RI(iasq[1]): return regs->iasq[1];
518 case RI(iir): return regs->iir;
519 case RI(isr): return regs->isr;
520 case RI(ior): return regs->ior;
521 case RI(ipsw): return regs->ipsw;
522 case RI(cr27): return regs->cr27;
523 case cr0, cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31;
524 case cr8, cr9, cr12, cr13, cr10, cr15;
525#endif
526 }
527}
528
529static int gpr_get(struct task_struct *target,
530 const struct user_regset *regset,
531 unsigned int pos, unsigned int count,
532 void *kbuf, void __user *ubuf)
533{
534 struct pt_regs *regs = task_regs(target);
535 unsigned long *k = kbuf;
536 unsigned long __user *u = ubuf;
537 unsigned long reg;
538
539 pos /= sizeof(reg);
540 count /= sizeof(reg);
541
542 if (kbuf)
543 for (; count > 0 && pos < ELF_NGREG; --count)
544 *k++ = get_reg(regs, pos++);
545 else
546 for (; count > 0 && pos < ELF_NGREG; --count)
547 if (__put_user(get_reg(regs, pos++), u++))
548 return -EFAULT;
549 kbuf = k;
550 ubuf = u;
551 pos *= sizeof(reg);
552 count *= sizeof(reg);
553 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
554 ELF_NGREG * sizeof(reg), -1);
555}
556
557static int gpr_set(struct task_struct *target,
558 const struct user_regset *regset,
559 unsigned int pos, unsigned int count,
560 const void *kbuf, const void __user *ubuf)
561{
562 struct pt_regs *regs = task_regs(target);
563 const unsigned long *k = kbuf;
564 const unsigned long __user *u = ubuf;
565 unsigned long reg;
566
567 pos /= sizeof(reg);
568 count /= sizeof(reg);
569
570 if (kbuf)
571 for (; count > 0 && pos < ELF_NGREG; --count)
572 set_reg(regs, pos++, *k++);
573 else
574 for (; count > 0 && pos < ELF_NGREG; --count) {
575 if (__get_user(reg, u++))
576 return -EFAULT;
577 set_reg(regs, pos++, reg);
578 }
579
580 kbuf = k;
581 ubuf = u;
582 pos *= sizeof(reg);
583 count *= sizeof(reg);
584 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
585 ELF_NGREG * sizeof(reg), -1);
586}
587
588static const struct user_regset native_regsets[] = {
589 [REGSET_GENERAL] = {
590 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
591 .size = sizeof(long), .align = sizeof(long),
592 .get = gpr_get, .set = gpr_set
593 },
594 [REGSET_FP] = {
595 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
596 .size = sizeof(__u64), .align = sizeof(__u64),
597 .get = fpr_get, .set = fpr_set
598 }
599};
600
601static const struct user_regset_view user_parisc_native_view = {
602 .name = "parisc", .e_machine = ELF_ARCH, .ei_osabi = ELFOSABI_LINUX,
603 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
604};
605
606#ifdef CONFIG_64BIT
607#include <linux/compat.h>
608
609static int gpr32_get(struct task_struct *target,
610 const struct user_regset *regset,
611 unsigned int pos, unsigned int count,
612 void *kbuf, void __user *ubuf)
613{
614 struct pt_regs *regs = task_regs(target);
615 compat_ulong_t *k = kbuf;
616 compat_ulong_t __user *u = ubuf;
617 compat_ulong_t reg;
618
619 pos /= sizeof(reg);
620 count /= sizeof(reg);
621
622 if (kbuf)
623 for (; count > 0 && pos < ELF_NGREG; --count)
624 *k++ = get_reg(regs, pos++);
625 else
626 for (; count > 0 && pos < ELF_NGREG; --count)
627 if (__put_user((compat_ulong_t) get_reg(regs, pos++), u++))
628 return -EFAULT;
629
630 kbuf = k;
631 ubuf = u;
632 pos *= sizeof(reg);
633 count *= sizeof(reg);
634 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
635 ELF_NGREG * sizeof(reg), -1);
636}
637
638static int gpr32_set(struct task_struct *target,
639 const struct user_regset *regset,
640 unsigned int pos, unsigned int count,
641 const void *kbuf, const void __user *ubuf)
642{
643 struct pt_regs *regs = task_regs(target);
644 const compat_ulong_t *k = kbuf;
645 const compat_ulong_t __user *u = ubuf;
646 compat_ulong_t reg;
647
648 pos /= sizeof(reg);
649 count /= sizeof(reg);
650
651 if (kbuf)
652 for (; count > 0 && pos < ELF_NGREG; --count)
653 set_reg(regs, pos++, *k++);
654 else
655 for (; count > 0 && pos < ELF_NGREG; --count) {
656 if (__get_user(reg, u++))
657 return -EFAULT;
658 set_reg(regs, pos++, reg);
659 }
660
661 kbuf = k;
662 ubuf = u;
663 pos *= sizeof(reg);
664 count *= sizeof(reg);
665 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
666 ELF_NGREG * sizeof(reg), -1);
667}
668
669/*
670 * These are the regset flavors matching the 32bit native set.
671 */
672static const struct user_regset compat_regsets[] = {
673 [REGSET_GENERAL] = {
674 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
675 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
676 .get = gpr32_get, .set = gpr32_set
677 },
678 [REGSET_FP] = {
679 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
680 .size = sizeof(__u64), .align = sizeof(__u64),
681 .get = fpr_get, .set = fpr_set
682 }
683};
684
685static const struct user_regset_view user_parisc_compat_view = {
686 .name = "parisc", .e_machine = EM_PARISC, .ei_osabi = ELFOSABI_LINUX,
687 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
688};
689#endif /* CONFIG_64BIT */
690
691const struct user_regset_view *task_user_regset_view(struct task_struct *task)
692{
693 BUILD_BUG_ON(sizeof(struct user_regs_struct)/sizeof(long) != ELF_NGREG);
694 BUILD_BUG_ON(sizeof(struct user_fp_struct)/sizeof(__u64) != ELF_NFPREG);
695#ifdef CONFIG_64BIT
696 if (is_compat_task())
697 return &user_parisc_compat_view;
698#endif
699 return &user_parisc_native_view;
700}
701
702
703/* HAVE_REGS_AND_STACK_ACCESS_API feature */
704
705struct pt_regs_offset {
706 const char *name;
707 int offset;
708};
709
710#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
711#define REG_OFFSET_INDEX(r,i) {.name = #r#i, .offset = offsetof(struct pt_regs, r[i])}
712#define REG_OFFSET_END {.name = NULL, .offset = 0}
713
714static const struct pt_regs_offset regoffset_table[] = {
715 REG_OFFSET_INDEX(gr,0),
716 REG_OFFSET_INDEX(gr,1),
717 REG_OFFSET_INDEX(gr,2),
718 REG_OFFSET_INDEX(gr,3),
719 REG_OFFSET_INDEX(gr,4),
720 REG_OFFSET_INDEX(gr,5),
721 REG_OFFSET_INDEX(gr,6),
722 REG_OFFSET_INDEX(gr,7),
723 REG_OFFSET_INDEX(gr,8),
724 REG_OFFSET_INDEX(gr,9),
725 REG_OFFSET_INDEX(gr,10),
726 REG_OFFSET_INDEX(gr,11),
727 REG_OFFSET_INDEX(gr,12),
728 REG_OFFSET_INDEX(gr,13),
729 REG_OFFSET_INDEX(gr,14),
730 REG_OFFSET_INDEX(gr,15),
731 REG_OFFSET_INDEX(gr,16),
732 REG_OFFSET_INDEX(gr,17),
733 REG_OFFSET_INDEX(gr,18),
734 REG_OFFSET_INDEX(gr,19),
735 REG_OFFSET_INDEX(gr,20),
736 REG_OFFSET_INDEX(gr,21),
737 REG_OFFSET_INDEX(gr,22),
738 REG_OFFSET_INDEX(gr,23),
739 REG_OFFSET_INDEX(gr,24),
740 REG_OFFSET_INDEX(gr,25),
741 REG_OFFSET_INDEX(gr,26),
742 REG_OFFSET_INDEX(gr,27),
743 REG_OFFSET_INDEX(gr,28),
744 REG_OFFSET_INDEX(gr,29),
745 REG_OFFSET_INDEX(gr,30),
746 REG_OFFSET_INDEX(gr,31),
747 REG_OFFSET_INDEX(sr,0),
748 REG_OFFSET_INDEX(sr,1),
749 REG_OFFSET_INDEX(sr,2),
750 REG_OFFSET_INDEX(sr,3),
751 REG_OFFSET_INDEX(sr,4),
752 REG_OFFSET_INDEX(sr,5),
753 REG_OFFSET_INDEX(sr,6),
754 REG_OFFSET_INDEX(sr,7),
755 REG_OFFSET_INDEX(iasq,0),
756 REG_OFFSET_INDEX(iasq,1),
757 REG_OFFSET_INDEX(iaoq,0),
758 REG_OFFSET_INDEX(iaoq,1),
759 REG_OFFSET_NAME(cr27),
760 REG_OFFSET_NAME(ksp),
761 REG_OFFSET_NAME(kpc),
762 REG_OFFSET_NAME(sar),
763 REG_OFFSET_NAME(iir),
764 REG_OFFSET_NAME(isr),
765 REG_OFFSET_NAME(ior),
766 REG_OFFSET_NAME(ipsw),
767 REG_OFFSET_END,
768};
769
770/**
771 * regs_query_register_offset() - query register offset from its name
772 * @name: the name of a register
773 *
774 * regs_query_register_offset() returns the offset of a register in struct
775 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
776 */
777int regs_query_register_offset(const char *name)
778{
779 const struct pt_regs_offset *roff;
780 for (roff = regoffset_table; roff->name != NULL; roff++)
781 if (!strcmp(roff->name, name))
782 return roff->offset;
783 return -EINVAL;
784}
785
786/**
787 * regs_query_register_name() - query register name from its offset
788 * @offset: the offset of a register in struct pt_regs.
789 *
790 * regs_query_register_name() returns the name of a register from its
791 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
792 */
793const char *regs_query_register_name(unsigned int offset)
794{
795 const struct pt_regs_offset *roff;
796 for (roff = regoffset_table; roff->name != NULL; roff++)
797 if (roff->offset == offset)
798 return roff->name;
799 return NULL;
800}
801
802/**
803 * regs_within_kernel_stack() - check the address in the stack
804 * @regs: pt_regs which contains kernel stack pointer.
805 * @addr: address which is checked.
806 *
807 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
808 * If @addr is within the kernel stack, it returns true. If not, returns false.
809 */
810int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
811{
812 return ((addr & ~(THREAD_SIZE - 1)) ==
813 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
814}
815
816/**
817 * regs_get_kernel_stack_nth() - get Nth entry of the stack
818 * @regs: pt_regs which contains kernel stack pointer.
819 * @n: stack entry number.
820 *
821 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
822 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
823 * this returns 0.
824 */
825unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
826{
827 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
828
829 addr -= n;
830
831 if (!regs_within_kernel_stack(regs, (unsigned long)addr))
832 return 0;
833
834 return *addr;
835}
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/processor.h>
30#include <asm/asm-offsets.h>
31
32/* PSW bits we allow the debugger to modify */
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 * These are our native regset flavors.
40 */
41enum parisc_regset {
42 REGSET_GENERAL,
43 REGSET_FP
44};
45
46/*
47 * Called by kernel/ptrace.c when detaching..
48 *
49 * Make sure single step bits etc are not set.
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 /* make sure the trap bits are not set */
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 * The following functions are called by ptrace_resume() when
65 * enabling or disabling single/block tracing.
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 /* Nullified, just crank over the queue. */
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 /* Don't wake up the task, but let the
89 parent know something happened. */
90 force_sig_fault_to_task(SIGTRAP, TRAP_TRACE,
91 (void __user *) (task_regs(task)->iaoq[0] & ~3),
92 task);
93 /* notify_parent(task, SIGCHLD); */
94 return;
95 }
96
97 /* Enable recovery counter traps. The recovery counter
98 * itself will be set to zero on a task switch. If the
99 * task is suspended on a syscall then the syscall return
100 * path will overwrite the recovery counter with a suitable
101 * value such that it traps once back in user space. We
102 * disable interrupts in the tasks PSW here also, to avoid
103 * interrupts while the recovery counter is decrementing.
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 /* Enable taken branch trap. */
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 /* Read the word at location addr in the USER area. For ptraced
133 processes, the kernel saves all regs on a syscall. */
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 /* Write the word at location addr in the USER area. This will need
143 to change when the kernel no longer saves all regs on a syscall.
144 FIXME. There is a problem at the moment in that r3-r18 are only
145 saved if the process is ptraced on syscall entry, and even then
146 those values are overwritten by actual register values on syscall
147 exit. */
148 case PTRACE_POKEUSR:
149 /* Some register values written here may be ignored in
150 * entry.S:syscall_restore_rfi; e.g. iaoq is written with
151 * r31/r31+4, and not with the values in pt_regs.
152 */
153 if (addr == PT_PSW) {
154 /* Allow writing to Nullify, Divide-step-correction,
155 * and carry/borrow bits.
156 * BEWARE, if you set N, and then single step, it won't
157 * stop on the nullified instruction.
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; /* ensure userspace privilege */
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: /* Get all gp regs from the child. */
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: /* Set all gp regs in the child. */
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: /* Get the child FPU state. */
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: /* Set the child FPU state. */
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/* This function is needed to translate 32 bit pt_regs offsets in to
221 * 64 bit pt_regs offsets. For example, a 32 bit gdb under a 64 bit kernel
222 * will request offset 12 if it wants gr3, but the lower 32 bits of
223 * the 64 bit kernels view of gr3 will be at offset 28 (3*8 + 4).
224 * This code relies on a 32 bit pt_regs being comprised of 32 bit values
225 * except for the fp registers which (a) are 64 bits, and (b) follow
226 * the gr registers at the start of pt_regs. The 32 bit pt_regs should
227 * be half the size of the 64 bit pt_regs, plus 32*4 to allow for fr[]
228 * being 64 bit in both cases.
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) /* gr[0..31] */
236 pos = offset * 2 + 4;
237 else if (offset < 32*4+32*8) /* fr[0] ... fr[31] */
238 pos = (offset - 32*4) + PT_FR0;
239 else if (offset < sizeof(struct pt_regs)/2 + 32*4) /* sr[0] ... ipsw */
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 /* 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_IAOQ0+4 || addr == PT_IAOQ1+4) {
289 data |= 3; /* ensure userspace privilege */
290 }
291 if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
292 /* Special case, fp regs are 64 bits anyway */
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 /* Zero the top 32 bits */
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 * As tracesys_next does not set %r28 to -ENOSYS
323 * when %r20 is set to -1, initialize it here.
324 */
325 regs->gr[28] = -ENOSYS;
326
327 if (rc) {
328 /*
329 * A nonzero return code from
330 * tracehook_report_syscall_entry() tells us
331 * to prevent the syscall execution. Skip
332 * the syscall call and the syscall restart handling.
333 *
334 * Note that the tracer may also just change
335 * regs->gr[20] to an invalid syscall number,
336 * that is handled by tracesys_next.
337 */
338 regs->gr[20] = -1UL;
339 return -1;
340 }
341 }
342
343 /* Do the secure computing check after ptrace. */
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 * Sign extend the syscall number to 64bit since it may have been
366 * modified by a compat ptrace call
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 * regset functions.
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 * PSW is in gr[0].
472 * Allow writing to Nullify, Divide-step-correction,
473 * and carry/borrow bits.
474 * BEWARE, if you set N, and then single step, it won't
475 * stop on the nullified instruction.
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 /* set 2 lowest bits to ensure userspace privilege: */
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 /* do not allow to change any of the following registers (yet) */
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
570static int gpr32_get(struct task_struct *target,
571 const struct user_regset *regset,
572 struct membuf to)
573{
574 struct pt_regs *regs = task_regs(target);
575 unsigned int pos;
576
577 for (pos = 0; pos < ELF_NGREG; pos++)
578 membuf_store(&to, (compat_ulong_t)get_reg(regs, pos));
579
580 return 0;
581}
582
583static int gpr32_set(struct task_struct *target,
584 const struct user_regset *regset,
585 unsigned int pos, unsigned int count,
586 const void *kbuf, const void __user *ubuf)
587{
588 struct pt_regs *regs = task_regs(target);
589 const compat_ulong_t *k = kbuf;
590 const compat_ulong_t __user *u = ubuf;
591 compat_ulong_t reg;
592
593 pos /= sizeof(reg);
594 count /= sizeof(reg);
595
596 if (kbuf)
597 for (; count > 0 && pos < ELF_NGREG; --count)
598 set_reg(regs, pos++, *k++);
599 else
600 for (; count > 0 && pos < ELF_NGREG; --count) {
601 if (__get_user(reg, u++))
602 return -EFAULT;
603 set_reg(regs, pos++, reg);
604 }
605
606 kbuf = k;
607 ubuf = u;
608 pos *= sizeof(reg);
609 count *= sizeof(reg);
610 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
611 ELF_NGREG * sizeof(reg), -1);
612}
613
614/*
615 * These are the regset flavors matching the 32bit native set.
616 */
617static const struct user_regset compat_regsets[] = {
618 [REGSET_GENERAL] = {
619 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
620 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
621 .regset_get = gpr32_get, .set = gpr32_set
622 },
623 [REGSET_FP] = {
624 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
625 .size = sizeof(__u64), .align = sizeof(__u64),
626 .regset_get = fpr_get, .set = fpr_set
627 }
628};
629
630static const struct user_regset_view user_parisc_compat_view = {
631 .name = "parisc", .e_machine = EM_PARISC, .ei_osabi = ELFOSABI_LINUX,
632 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
633};
634#endif /* CONFIG_64BIT */
635
636const struct user_regset_view *task_user_regset_view(struct task_struct *task)
637{
638 BUILD_BUG_ON(sizeof(struct user_regs_struct)/sizeof(long) != ELF_NGREG);
639 BUILD_BUG_ON(sizeof(struct user_fp_struct)/sizeof(__u64) != ELF_NFPREG);
640#ifdef CONFIG_64BIT
641 if (is_compat_task())
642 return &user_parisc_compat_view;
643#endif
644 return &user_parisc_native_view;
645}
646
647
648/* HAVE_REGS_AND_STACK_ACCESS_API feature */
649
650struct pt_regs_offset {
651 const char *name;
652 int offset;
653};
654
655#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
656#define REG_OFFSET_INDEX(r,i) {.name = #r#i, .offset = offsetof(struct pt_regs, r[i])}
657#define REG_OFFSET_END {.name = NULL, .offset = 0}
658
659static const struct pt_regs_offset regoffset_table[] = {
660 REG_OFFSET_INDEX(gr,0),
661 REG_OFFSET_INDEX(gr,1),
662 REG_OFFSET_INDEX(gr,2),
663 REG_OFFSET_INDEX(gr,3),
664 REG_OFFSET_INDEX(gr,4),
665 REG_OFFSET_INDEX(gr,5),
666 REG_OFFSET_INDEX(gr,6),
667 REG_OFFSET_INDEX(gr,7),
668 REG_OFFSET_INDEX(gr,8),
669 REG_OFFSET_INDEX(gr,9),
670 REG_OFFSET_INDEX(gr,10),
671 REG_OFFSET_INDEX(gr,11),
672 REG_OFFSET_INDEX(gr,12),
673 REG_OFFSET_INDEX(gr,13),
674 REG_OFFSET_INDEX(gr,14),
675 REG_OFFSET_INDEX(gr,15),
676 REG_OFFSET_INDEX(gr,16),
677 REG_OFFSET_INDEX(gr,17),
678 REG_OFFSET_INDEX(gr,18),
679 REG_OFFSET_INDEX(gr,19),
680 REG_OFFSET_INDEX(gr,20),
681 REG_OFFSET_INDEX(gr,21),
682 REG_OFFSET_INDEX(gr,22),
683 REG_OFFSET_INDEX(gr,23),
684 REG_OFFSET_INDEX(gr,24),
685 REG_OFFSET_INDEX(gr,25),
686 REG_OFFSET_INDEX(gr,26),
687 REG_OFFSET_INDEX(gr,27),
688 REG_OFFSET_INDEX(gr,28),
689 REG_OFFSET_INDEX(gr,29),
690 REG_OFFSET_INDEX(gr,30),
691 REG_OFFSET_INDEX(gr,31),
692 REG_OFFSET_INDEX(sr,0),
693 REG_OFFSET_INDEX(sr,1),
694 REG_OFFSET_INDEX(sr,2),
695 REG_OFFSET_INDEX(sr,3),
696 REG_OFFSET_INDEX(sr,4),
697 REG_OFFSET_INDEX(sr,5),
698 REG_OFFSET_INDEX(sr,6),
699 REG_OFFSET_INDEX(sr,7),
700 REG_OFFSET_INDEX(iasq,0),
701 REG_OFFSET_INDEX(iasq,1),
702 REG_OFFSET_INDEX(iaoq,0),
703 REG_OFFSET_INDEX(iaoq,1),
704 REG_OFFSET_NAME(cr27),
705 REG_OFFSET_NAME(ksp),
706 REG_OFFSET_NAME(kpc),
707 REG_OFFSET_NAME(sar),
708 REG_OFFSET_NAME(iir),
709 REG_OFFSET_NAME(isr),
710 REG_OFFSET_NAME(ior),
711 REG_OFFSET_NAME(ipsw),
712 REG_OFFSET_END,
713};
714
715/**
716 * regs_query_register_offset() - query register offset from its name
717 * @name: the name of a register
718 *
719 * regs_query_register_offset() returns the offset of a register in struct
720 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
721 */
722int regs_query_register_offset(const char *name)
723{
724 const struct pt_regs_offset *roff;
725 for (roff = regoffset_table; roff->name != NULL; roff++)
726 if (!strcmp(roff->name, name))
727 return roff->offset;
728 return -EINVAL;
729}
730
731/**
732 * regs_query_register_name() - query register name from its offset
733 * @offset: the offset of a register in struct pt_regs.
734 *
735 * regs_query_register_name() returns the name of a register from its
736 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
737 */
738const char *regs_query_register_name(unsigned int offset)
739{
740 const struct pt_regs_offset *roff;
741 for (roff = regoffset_table; roff->name != NULL; roff++)
742 if (roff->offset == offset)
743 return roff->name;
744 return NULL;
745}
746
747/**
748 * regs_within_kernel_stack() - check the address in the stack
749 * @regs: pt_regs which contains kernel stack pointer.
750 * @addr: address which is checked.
751 *
752 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
753 * If @addr is within the kernel stack, it returns true. If not, returns false.
754 */
755int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
756{
757 return ((addr & ~(THREAD_SIZE - 1)) ==
758 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
759}
760
761/**
762 * regs_get_kernel_stack_nth() - get Nth entry of the stack
763 * @regs: pt_regs which contains kernel stack pointer.
764 * @n: stack entry number.
765 *
766 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
767 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
768 * this returns 0.
769 */
770unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
771{
772 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
773
774 addr -= n;
775
776 if (!regs_within_kernel_stack(regs, (unsigned long)addr))
777 return 0;
778
779 return *addr;
780}