1// SPDX-License-Identifier: GPL-2.0-or-later
2
3#include <linux/regset.h>
4#include <linux/elf.h>
5#include <linux/nospec.h>
6#include <linux/pkeys.h>
7
8#include "ptrace-decl.h"
9
10struct pt_regs_offset {
11 const char *name;
12 int offset;
13};
14
15#define STR(s) #s /* convert to string */
16#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
17#define GPR_OFFSET_NAME(num) \
18 {.name = STR(r##num), .offset = offsetof(struct pt_regs, gpr[num])}, \
19 {.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
20#define REG_OFFSET_END {.name = NULL, .offset = 0}
21
22static const struct pt_regs_offset regoffset_table[] = {
23 GPR_OFFSET_NAME(0),
24 GPR_OFFSET_NAME(1),
25 GPR_OFFSET_NAME(2),
26 GPR_OFFSET_NAME(3),
27 GPR_OFFSET_NAME(4),
28 GPR_OFFSET_NAME(5),
29 GPR_OFFSET_NAME(6),
30 GPR_OFFSET_NAME(7),
31 GPR_OFFSET_NAME(8),
32 GPR_OFFSET_NAME(9),
33 GPR_OFFSET_NAME(10),
34 GPR_OFFSET_NAME(11),
35 GPR_OFFSET_NAME(12),
36 GPR_OFFSET_NAME(13),
37 GPR_OFFSET_NAME(14),
38 GPR_OFFSET_NAME(15),
39 GPR_OFFSET_NAME(16),
40 GPR_OFFSET_NAME(17),
41 GPR_OFFSET_NAME(18),
42 GPR_OFFSET_NAME(19),
43 GPR_OFFSET_NAME(20),
44 GPR_OFFSET_NAME(21),
45 GPR_OFFSET_NAME(22),
46 GPR_OFFSET_NAME(23),
47 GPR_OFFSET_NAME(24),
48 GPR_OFFSET_NAME(25),
49 GPR_OFFSET_NAME(26),
50 GPR_OFFSET_NAME(27),
51 GPR_OFFSET_NAME(28),
52 GPR_OFFSET_NAME(29),
53 GPR_OFFSET_NAME(30),
54 GPR_OFFSET_NAME(31),
55 REG_OFFSET_NAME(nip),
56 REG_OFFSET_NAME(msr),
57 REG_OFFSET_NAME(ctr),
58 REG_OFFSET_NAME(link),
59 REG_OFFSET_NAME(xer),
60 REG_OFFSET_NAME(ccr),
61#ifdef CONFIG_PPC64
62 REG_OFFSET_NAME(softe),
63#else
64 REG_OFFSET_NAME(mq),
65#endif
66 REG_OFFSET_NAME(trap),
67 REG_OFFSET_NAME(dar),
68 REG_OFFSET_NAME(dsisr),
69 REG_OFFSET_END,
70};
71
72/**
73 * regs_query_register_offset() - query register offset from its name
74 * @name: the name of a register
75 *
76 * regs_query_register_offset() returns the offset of a register in struct
77 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
78 */
79int regs_query_register_offset(const char *name)
80{
81 const struct pt_regs_offset *roff;
82 for (roff = regoffset_table; roff->name != NULL; roff++)
83 if (!strcmp(roff->name, name))
84 return roff->offset;
85 return -EINVAL;
86}
87
88/**
89 * regs_query_register_name() - query register name from its offset
90 * @offset: the offset of a register in struct pt_regs.
91 *
92 * regs_query_register_name() returns the name of a register from its
93 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
94 */
95const char *regs_query_register_name(unsigned int offset)
96{
97 const struct pt_regs_offset *roff;
98 for (roff = regoffset_table; roff->name != NULL; roff++)
99 if (roff->offset == offset)
100 return roff->name;
101 return NULL;
102}
103
104/*
105 * does not yet catch signals sent when the child dies.
106 * in exit.c or in signal.c.
107 */
108
109static unsigned long get_user_msr(struct task_struct *task)
110{
111 return task->thread.regs->msr | task->thread.fpexc_mode;
112}
113
114static __always_inline int set_user_msr(struct task_struct *task, unsigned long msr)
115{
116 unsigned long newmsr = (task->thread.regs->msr & ~MSR_DEBUGCHANGE) |
117 (msr & MSR_DEBUGCHANGE);
118 regs_set_return_msr(task->thread.regs, newmsr);
119 return 0;
120}
121
122#ifdef CONFIG_PPC64
123static int get_user_dscr(struct task_struct *task, unsigned long *data)
124{
125 *data = task->thread.dscr;
126 return 0;
127}
128
129static int set_user_dscr(struct task_struct *task, unsigned long dscr)
130{
131 task->thread.dscr = dscr;
132 task->thread.dscr_inherit = 1;
133 return 0;
134}
135#else
136static int get_user_dscr(struct task_struct *task, unsigned long *data)
137{
138 return -EIO;
139}
140
141static int set_user_dscr(struct task_struct *task, unsigned long dscr)
142{
143 return -EIO;
144}
145#endif
146
147/*
148 * We prevent mucking around with the reserved area of trap
149 * which are used internally by the kernel.
150 */
151static __always_inline int set_user_trap(struct task_struct *task, unsigned long trap)
152{
153 set_trap(task->thread.regs, trap);
154 return 0;
155}
156
157/*
158 * Get contents of register REGNO in task TASK.
159 */
160int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data)
161{
162 unsigned int regs_max;
163
164 if (task->thread.regs == NULL || !data)
165 return -EIO;
166
167 if (regno == PT_MSR) {
168 *data = get_user_msr(task);
169 return 0;
170 }
171
172 if (regno == PT_DSCR)
173 return get_user_dscr(task, data);
174
175 /*
176 * softe copies paca->irq_soft_mask variable state. Since irq_soft_mask is
177 * no more used as a flag, lets force usr to always see the softe value as 1
178 * which means interrupts are not soft disabled.
179 */
180 if (IS_ENABLED(CONFIG_PPC64) && regno == PT_SOFTE) {
181 *data = 1;
182 return 0;
183 }
184
185 regs_max = sizeof(struct user_pt_regs) / sizeof(unsigned long);
186 if (regno < regs_max) {
187 regno = array_index_nospec(regno, regs_max);
188 *data = ((unsigned long *)task->thread.regs)[regno];
189 return 0;
190 }
191
192 return -EIO;
193}
194
195/*
196 * Write contents of register REGNO in task TASK.
197 */
198int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
199{
200 if (task->thread.regs == NULL)
201 return -EIO;
202
203 if (regno == PT_MSR)
204 return set_user_msr(task, msr: data);
205 if (regno == PT_TRAP)
206 return set_user_trap(task, trap: data);
207 if (regno == PT_DSCR)
208 return set_user_dscr(task, dscr: data);
209
210 if (regno <= PT_MAX_PUT_REG) {
211 regno = array_index_nospec(regno, PT_MAX_PUT_REG + 1);
212 ((unsigned long *)task->thread.regs)[regno] = data;
213 return 0;
214 }
215 return -EIO;
216}
217
218static int gpr_get(struct task_struct *target, const struct user_regset *regset,
219 struct membuf to)
220{
221 struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr));
222#ifdef CONFIG_PPC64
223 struct membuf to_softe = membuf_at(&to, offsetof(struct pt_regs, softe));
224#endif
225 if (target->thread.regs == NULL)
226 return -EIO;
227
228 membuf_write(&to, target->thread.regs, sizeof(struct user_pt_regs));
229
230 membuf_store(&to_msr, get_user_msr(target));
231#ifdef CONFIG_PPC64
232 membuf_store(&to_softe, 0x1ul);
233#endif
234 return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) -
235 sizeof(struct user_pt_regs));
236}
237
238static int gpr_set(struct task_struct *target, const struct user_regset *regset,
239 unsigned int pos, unsigned int count, const void *kbuf,
240 const void __user *ubuf)
241{
242 unsigned long reg;
243 int ret;
244
245 if (target->thread.regs == NULL)
246 return -EIO;
247
248 ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf,
249 data: target->thread.regs,
250 start_pos: 0, end_pos: PT_MSR * sizeof(reg));
251
252 if (!ret && count > 0) {
253 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
254 PT_MSR * sizeof(reg),
255 (PT_MSR + 1) * sizeof(reg));
256 if (!ret)
257 ret = set_user_msr(task: target, msr: reg);
258 }
259
260 BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
261 offsetof(struct pt_regs, msr) + sizeof(long));
262
263 if (!ret)
264 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
265 &target->thread.regs->orig_gpr3,
266 PT_ORIG_R3 * sizeof(reg),
267 (PT_MAX_PUT_REG + 1) * sizeof(reg));
268
269 if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
270 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
271 (PT_MAX_PUT_REG + 1) * sizeof(reg),
272 PT_TRAP * sizeof(reg));
273
274 if (!ret && count > 0) {
275 ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, data: &reg,
276 start_pos: PT_TRAP * sizeof(reg),
277 end_pos: (PT_TRAP + 1) * sizeof(reg));
278 if (!ret)
279 ret = set_user_trap(task: target, trap: reg);
280 }
281
282 if (!ret)
283 user_regset_copyin_ignore(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf,
284 start_pos: (PT_TRAP + 1) * sizeof(reg), end_pos: -1);
285
286 return ret;
287}
288
289#ifdef CONFIG_PPC64
290static int ppr_get(struct task_struct *target, const struct user_regset *regset,
291 struct membuf to)
292{
293 if (!target->thread.regs)
294 return -EINVAL;
295
296 return membuf_write(&to, &target->thread.regs->ppr, sizeof(u64));
297}
298
299static int ppr_set(struct task_struct *target, const struct user_regset *regset,
300 unsigned int pos, unsigned int count, const void *kbuf,
301 const void __user *ubuf)
302{
303 if (!target->thread.regs)
304 return -EINVAL;
305
306 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
307 &target->thread.regs->ppr, 0, sizeof(u64));
308}
309
310static int dscr_get(struct task_struct *target, const struct user_regset *regset,
311 struct membuf to)
312{
313 return membuf_write(&to, &target->thread.dscr, sizeof(u64));
314}
315static int dscr_set(struct task_struct *target, const struct user_regset *regset,
316 unsigned int pos, unsigned int count, const void *kbuf,
317 const void __user *ubuf)
318{
319 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
320 &target->thread.dscr, 0, sizeof(u64));
321}
322#endif
323#ifdef CONFIG_PPC_BOOK3S_64
324static int tar_get(struct task_struct *target, const struct user_regset *regset,
325 struct membuf to)
326{
327 return membuf_write(&to, &target->thread.tar, sizeof(u64));
328}
329static int tar_set(struct task_struct *target, const struct user_regset *regset,
330 unsigned int pos, unsigned int count, const void *kbuf,
331 const void __user *ubuf)
332{
333 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
334 &target->thread.tar, 0, sizeof(u64));
335}
336
337static int ebb_active(struct task_struct *target, const struct user_regset *regset)
338{
339 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
340 return -ENODEV;
341
342 if (target->thread.used_ebb)
343 return regset->n;
344
345 return 0;
346}
347
348static int ebb_get(struct task_struct *target, const struct user_regset *regset,
349 struct membuf to)
350{
351 /* Build tests */
352 BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
353 BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
354
355 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
356 return -ENODEV;
357
358 if (!target->thread.used_ebb)
359 return -ENODATA;
360
361 return membuf_write(&to, &target->thread.ebbrr, 3 * sizeof(unsigned long));
362}
363
364static int ebb_set(struct task_struct *target, const struct user_regset *regset,
365 unsigned int pos, unsigned int count, const void *kbuf,
366 const void __user *ubuf)
367{
368 int ret = 0;
369
370 /* Build tests */
371 BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
372 BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
373
374 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
375 return -ENODEV;
376
377 if (target->thread.used_ebb)
378 return -ENODATA;
379
380 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.ebbrr,
381 0, sizeof(unsigned long));
382
383 if (!ret)
384 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
385 &target->thread.ebbhr, sizeof(unsigned long),
386 2 * sizeof(unsigned long));
387
388 if (!ret)
389 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
390 &target->thread.bescr, 2 * sizeof(unsigned long),
391 3 * sizeof(unsigned long));
392
393 return ret;
394}
395static int pmu_active(struct task_struct *target, const struct user_regset *regset)
396{
397 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
398 return -ENODEV;
399
400 return regset->n;
401}
402
403static int pmu_get(struct task_struct *target, const struct user_regset *regset,
404 struct membuf to)
405{
406 /* Build tests */
407 BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
408 BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
409 BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
410 BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
411
412 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
413 return -ENODEV;
414
415 return membuf_write(&to, &target->thread.siar, 5 * sizeof(unsigned long));
416}
417
418static int pmu_set(struct task_struct *target, const struct user_regset *regset,
419 unsigned int pos, unsigned int count, const void *kbuf,
420 const void __user *ubuf)
421{
422 int ret = 0;
423
424 /* Build tests */
425 BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
426 BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
427 BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
428 BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
429
430 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
431 return -ENODEV;
432
433 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.siar,
434 0, sizeof(unsigned long));
435
436 if (!ret)
437 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
438 &target->thread.sdar, sizeof(unsigned long),
439 2 * sizeof(unsigned long));
440
441 if (!ret)
442 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
443 &target->thread.sier, 2 * sizeof(unsigned long),
444 3 * sizeof(unsigned long));
445
446 if (!ret)
447 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
448 &target->thread.mmcr2, 3 * sizeof(unsigned long),
449 4 * sizeof(unsigned long));
450
451 if (!ret)
452 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
453 &target->thread.mmcr0, 4 * sizeof(unsigned long),
454 5 * sizeof(unsigned long));
455 return ret;
456}
457
458static int dexcr_active(struct task_struct *target, const struct user_regset *regset)
459{
460 if (!cpu_has_feature(CPU_FTR_ARCH_31))
461 return -ENODEV;
462
463 return regset->n;
464}
465
466static int dexcr_get(struct task_struct *target, const struct user_regset *regset,
467 struct membuf to)
468{
469 if (!cpu_has_feature(CPU_FTR_ARCH_31))
470 return -ENODEV;
471
472 /*
473 * The DEXCR is currently static across all CPUs, so we don't
474 * store the target's value anywhere, but the static value
475 * will also be correct.
476 */
477 membuf_store(&to, (u64)lower_32_bits(DEXCR_INIT));
478
479 /*
480 * Technically the HDEXCR is per-cpu, but a hypervisor can't reasonably
481 * change it between CPUs of the same guest.
482 */
483 return membuf_store(&to, (u64)lower_32_bits(mfspr(SPRN_HDEXCR_RO)));
484}
485
486#ifdef CONFIG_CHECKPOINT_RESTORE
487static int hashkeyr_active(struct task_struct *target, const struct user_regset *regset)
488{
489 if (!cpu_has_feature(CPU_FTR_ARCH_31))
490 return -ENODEV;
491
492 return regset->n;
493}
494
495static int hashkeyr_get(struct task_struct *target, const struct user_regset *regset,
496 struct membuf to)
497{
498 if (!cpu_has_feature(CPU_FTR_ARCH_31))
499 return -ENODEV;
500
501 return membuf_store(&to, target->thread.hashkeyr);
502}
503
504static int hashkeyr_set(struct task_struct *target, const struct user_regset *regset,
505 unsigned int pos, unsigned int count, const void *kbuf,
506 const void __user *ubuf)
507{
508 if (!cpu_has_feature(CPU_FTR_ARCH_31))
509 return -ENODEV;
510
511 return user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.hashkeyr,
512 0, sizeof(unsigned long));
513}
514#endif /* CONFIG_CHECKPOINT_RESTORE */
515#endif /* CONFIG_PPC_BOOK3S_64 */
516
517#ifdef CONFIG_PPC_MEM_KEYS
518static int pkey_active(struct task_struct *target, const struct user_regset *regset)
519{
520 if (!arch_pkeys_enabled())
521 return -ENODEV;
522
523 return regset->n;
524}
525
526static int pkey_get(struct task_struct *target, const struct user_regset *regset,
527 struct membuf to)
528{
529
530 if (!arch_pkeys_enabled())
531 return -ENODEV;
532
533 membuf_store(&to, target->thread.regs->amr);
534 membuf_store(&to, target->thread.regs->iamr);
535 return membuf_store(&to, default_uamor);
536}
537
538static int pkey_set(struct task_struct *target, const struct user_regset *regset,
539 unsigned int pos, unsigned int count, const void *kbuf,
540 const void __user *ubuf)
541{
542 u64 new_amr;
543 int ret;
544
545 if (!arch_pkeys_enabled())
546 return -ENODEV;
547
548 /* Only the AMR can be set from userspace */
549 if (pos != 0 || count != sizeof(new_amr))
550 return -EINVAL;
551
552 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
553 &new_amr, 0, sizeof(new_amr));
554 if (ret)
555 return ret;
556
557 /*
558 * UAMOR determines which bits of the AMR can be set from userspace.
559 * UAMOR value 0b11 indicates that the AMR value can be modified
560 * from userspace. If the kernel is using a specific key, we avoid
561 * userspace modifying the AMR value for that key by masking them
562 * via UAMOR 0b00.
563 *
564 * Pick the AMR values for the keys that kernel is using. This
565 * will be indicated by the ~default_uamor bits.
566 */
567 target->thread.regs->amr = (new_amr & default_uamor) |
568 (target->thread.regs->amr & ~default_uamor);
569
570 return 0;
571}
572#endif /* CONFIG_PPC_MEM_KEYS */
573
574static const struct user_regset native_regsets[] = {
575 [REGSET_GPR] = {
576 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
577 .size = sizeof(long), .align = sizeof(long),
578 .regset_get = gpr_get, .set = gpr_set
579 },
580 [REGSET_FPR] = {
581 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
582 .size = sizeof(double), .align = sizeof(double),
583 .regset_get = fpr_get, .set = fpr_set
584 },
585#ifdef CONFIG_ALTIVEC
586 [REGSET_VMX] = {
587 .core_note_type = NT_PPC_VMX, .n = 34,
588 .size = sizeof(vector128), .align = sizeof(vector128),
589 .active = vr_active, .regset_get = vr_get, .set = vr_set
590 },
591#endif
592#ifdef CONFIG_VSX
593 [REGSET_VSX] = {
594 .core_note_type = NT_PPC_VSX, .n = 32,
595 .size = sizeof(double), .align = sizeof(double),
596 .active = vsr_active, .regset_get = vsr_get, .set = vsr_set
597 },
598#endif
599#ifdef CONFIG_SPE
600 [REGSET_SPE] = {
601 .core_note_type = NT_PPC_SPE, .n = 35,
602 .size = sizeof(u32), .align = sizeof(u32),
603 .active = evr_active, .regset_get = evr_get, .set = evr_set
604 },
605#endif
606#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
607 [REGSET_TM_CGPR] = {
608 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
609 .size = sizeof(long), .align = sizeof(long),
610 .active = tm_cgpr_active, .regset_get = tm_cgpr_get, .set = tm_cgpr_set
611 },
612 [REGSET_TM_CFPR] = {
613 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
614 .size = sizeof(double), .align = sizeof(double),
615 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
616 },
617 [REGSET_TM_CVMX] = {
618 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
619 .size = sizeof(vector128), .align = sizeof(vector128),
620 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
621 },
622 [REGSET_TM_CVSX] = {
623 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
624 .size = sizeof(double), .align = sizeof(double),
625 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
626 },
627 [REGSET_TM_SPR] = {
628 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
629 .size = sizeof(u64), .align = sizeof(u64),
630 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
631 },
632 [REGSET_TM_CTAR] = {
633 .core_note_type = NT_PPC_TM_CTAR, .n = 1,
634 .size = sizeof(u64), .align = sizeof(u64),
635 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
636 },
637 [REGSET_TM_CPPR] = {
638 .core_note_type = NT_PPC_TM_CPPR, .n = 1,
639 .size = sizeof(u64), .align = sizeof(u64),
640 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
641 },
642 [REGSET_TM_CDSCR] = {
643 .core_note_type = NT_PPC_TM_CDSCR, .n = 1,
644 .size = sizeof(u64), .align = sizeof(u64),
645 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
646 },
647#endif
648#ifdef CONFIG_PPC64
649 [REGSET_PPR] = {
650 .core_note_type = NT_PPC_PPR, .n = 1,
651 .size = sizeof(u64), .align = sizeof(u64),
652 .regset_get = ppr_get, .set = ppr_set
653 },
654 [REGSET_DSCR] = {
655 .core_note_type = NT_PPC_DSCR, .n = 1,
656 .size = sizeof(u64), .align = sizeof(u64),
657 .regset_get = dscr_get, .set = dscr_set
658 },
659#endif
660#ifdef CONFIG_PPC_BOOK3S_64
661 [REGSET_TAR] = {
662 .core_note_type = NT_PPC_TAR, .n = 1,
663 .size = sizeof(u64), .align = sizeof(u64),
664 .regset_get = tar_get, .set = tar_set
665 },
666 [REGSET_EBB] = {
667 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
668 .size = sizeof(u64), .align = sizeof(u64),
669 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set
670 },
671 [REGSET_PMR] = {
672 .core_note_type = NT_PPC_PMU, .n = ELF_NPMU,
673 .size = sizeof(u64), .align = sizeof(u64),
674 .active = pmu_active, .regset_get = pmu_get, .set = pmu_set
675 },
676 [REGSET_DEXCR] = {
677 .core_note_type = NT_PPC_DEXCR, .n = ELF_NDEXCR,
678 .size = sizeof(u64), .align = sizeof(u64),
679 .active = dexcr_active, .regset_get = dexcr_get
680 },
681#ifdef CONFIG_CHECKPOINT_RESTORE
682 [REGSET_HASHKEYR] = {
683 .core_note_type = NT_PPC_HASHKEYR, .n = ELF_NHASHKEYR,
684 .size = sizeof(u64), .align = sizeof(u64),
685 .active = hashkeyr_active, .regset_get = hashkeyr_get, .set = hashkeyr_set
686 },
687#endif
688#endif
689#ifdef CONFIG_PPC_MEM_KEYS
690 [REGSET_PKEY] = {
691 .core_note_type = NT_PPC_PKEY, .n = ELF_NPKEY,
692 .size = sizeof(u64), .align = sizeof(u64),
693 .active = pkey_active, .regset_get = pkey_get, .set = pkey_set
694 },
695#endif
696};
697
698const struct user_regset_view user_ppc_native_view = {
699 .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
700 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
701};
702
703#include <linux/compat.h>
704
705int gpr32_get_common(struct task_struct *target,
706 const struct user_regset *regset,
707 struct membuf to, unsigned long *regs)
708{
709 int i;
710
711 for (i = 0; i < PT_MSR; i++)
712 membuf_store(&to, (u32)regs[i]);
713 membuf_store(&to, (u32)get_user_msr(target));
714 for (i++ ; i < PT_REGS_COUNT; i++)
715 membuf_store(&to, (u32)regs[i]);
716 return membuf_zero(&to, (ELF_NGREG - PT_REGS_COUNT) * sizeof(u32));
717}
718
719static int gpr32_set_common_kernel(struct task_struct *target,
720 const struct user_regset *regset,
721 unsigned int pos, unsigned int count,
722 const void *kbuf, unsigned long *regs)
723{
724 const compat_ulong_t *k = kbuf;
725
726 pos /= sizeof(compat_ulong_t);
727 count /= sizeof(compat_ulong_t);
728
729 for (; count > 0 && pos < PT_MSR; --count)
730 regs[pos++] = *k++;
731
732 if (count > 0 && pos == PT_MSR) {
733 set_user_msr(task: target, msr: *k++);
734 ++pos;
735 --count;
736 }
737
738 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
739 regs[pos++] = *k++;
740 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
741 ++k;
742
743 if (count > 0 && pos == PT_TRAP) {
744 set_user_trap(task: target, trap: *k++);
745 ++pos;
746 --count;
747 }
748
749 kbuf = k;
750 pos *= sizeof(compat_ulong_t);
751 count *= sizeof(compat_ulong_t);
752 user_regset_copyin_ignore(&pos, &count, &kbuf, NULL,
753 (PT_TRAP + 1) * sizeof(compat_ulong_t), -1);
754 return 0;
755}
756
757static int gpr32_set_common_user(struct task_struct *target,
758 const struct user_regset *regset,
759 unsigned int pos, unsigned int count,
760 const void __user *ubuf, unsigned long *regs)
761{
762 const compat_ulong_t __user *u = ubuf;
763 const void *kbuf = NULL;
764 compat_ulong_t reg;
765
766 if (!user_read_access_begin(u, count))
767 return -EFAULT;
768
769 pos /= sizeof(reg);
770 count /= sizeof(reg);
771
772 for (; count > 0 && pos < PT_MSR; --count) {
773 unsafe_get_user(reg, u++, Efault);
774 regs[pos++] = reg;
775 }
776
777 if (count > 0 && pos == PT_MSR) {
778 unsafe_get_user(reg, u++, Efault);
779 set_user_msr(task: target, msr: reg);
780 ++pos;
781 --count;
782 }
783
784 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
785 unsafe_get_user(reg, u++, Efault);
786 regs[pos++] = reg;
787 }
788 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
789 unsafe_get_user(reg, u++, Efault);
790
791 if (count > 0 && pos == PT_TRAP) {
792 unsafe_get_user(reg, u++, Efault);
793 set_user_trap(task: target, trap: reg);
794 ++pos;
795 --count;
796 }
797 user_read_access_end();
798
799 ubuf = u;
800 pos *= sizeof(reg);
801 count *= sizeof(reg);
802 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
803 (PT_TRAP + 1) * sizeof(reg), -1);
804 return 0;
805
806Efault:
807 user_read_access_end();
808 return -EFAULT;
809}
810
811int gpr32_set_common(struct task_struct *target,
812 const struct user_regset *regset,
813 unsigned int pos, unsigned int count,
814 const void *kbuf, const void __user *ubuf,
815 unsigned long *regs)
816{
817 if (kbuf)
818 return gpr32_set_common_kernel(target, regset, pos, count, kbuf, regs);
819 else
820 return gpr32_set_common_user(target, regset, pos, count, ubuf, regs);
821}
822
823static int gpr32_get(struct task_struct *target,
824 const struct user_regset *regset,
825 struct membuf to)
826{
827 if (target->thread.regs == NULL)
828 return -EIO;
829
830 return gpr32_get_common(target, regset, to,
831 regs: &target->thread.regs->gpr[0]);
832}
833
834static int gpr32_set(struct task_struct *target,
835 const struct user_regset *regset,
836 unsigned int pos, unsigned int count,
837 const void *kbuf, const void __user *ubuf)
838{
839 if (target->thread.regs == NULL)
840 return -EIO;
841
842 return gpr32_set_common(target, regset, pos, count, kbuf, ubuf,
843 regs: &target->thread.regs->gpr[0]);
844}
845
846/*
847 * These are the regset flavors matching the CONFIG_PPC32 native set.
848 */
849static const struct user_regset compat_regsets[] = {
850 [REGSET_GPR] = {
851 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
852 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
853 .regset_get = gpr32_get, .set = gpr32_set
854 },
855 [REGSET_FPR] = {
856 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
857 .size = sizeof(double), .align = sizeof(double),
858 .regset_get = fpr_get, .set = fpr_set
859 },
860#ifdef CONFIG_ALTIVEC
861 [REGSET_VMX] = {
862 .core_note_type = NT_PPC_VMX, .n = 34,
863 .size = sizeof(vector128), .align = sizeof(vector128),
864 .active = vr_active, .regset_get = vr_get, .set = vr_set
865 },
866#endif
867#ifdef CONFIG_SPE
868 [REGSET_SPE] = {
869 .core_note_type = NT_PPC_SPE, .n = 35,
870 .size = sizeof(u32), .align = sizeof(u32),
871 .active = evr_active, .regset_get = evr_get, .set = evr_set
872 },
873#endif
874#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
875 [REGSET_TM_CGPR] = {
876 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
877 .size = sizeof(long), .align = sizeof(long),
878 .active = tm_cgpr_active,
879 .regset_get = tm_cgpr32_get, .set = tm_cgpr32_set
880 },
881 [REGSET_TM_CFPR] = {
882 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
883 .size = sizeof(double), .align = sizeof(double),
884 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
885 },
886 [REGSET_TM_CVMX] = {
887 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
888 .size = sizeof(vector128), .align = sizeof(vector128),
889 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
890 },
891 [REGSET_TM_CVSX] = {
892 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
893 .size = sizeof(double), .align = sizeof(double),
894 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
895 },
896 [REGSET_TM_SPR] = {
897 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
898 .size = sizeof(u64), .align = sizeof(u64),
899 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
900 },
901 [REGSET_TM_CTAR] = {
902 .core_note_type = NT_PPC_TM_CTAR, .n = 1,
903 .size = sizeof(u64), .align = sizeof(u64),
904 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
905 },
906 [REGSET_TM_CPPR] = {
907 .core_note_type = NT_PPC_TM_CPPR, .n = 1,
908 .size = sizeof(u64), .align = sizeof(u64),
909 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
910 },
911 [REGSET_TM_CDSCR] = {
912 .core_note_type = NT_PPC_TM_CDSCR, .n = 1,
913 .size = sizeof(u64), .align = sizeof(u64),
914 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
915 },
916#endif
917#ifdef CONFIG_PPC64
918 [REGSET_PPR] = {
919 .core_note_type = NT_PPC_PPR, .n = 1,
920 .size = sizeof(u64), .align = sizeof(u64),
921 .regset_get = ppr_get, .set = ppr_set
922 },
923 [REGSET_DSCR] = {
924 .core_note_type = NT_PPC_DSCR, .n = 1,
925 .size = sizeof(u64), .align = sizeof(u64),
926 .regset_get = dscr_get, .set = dscr_set
927 },
928#endif
929#ifdef CONFIG_PPC_BOOK3S_64
930 [REGSET_TAR] = {
931 .core_note_type = NT_PPC_TAR, .n = 1,
932 .size = sizeof(u64), .align = sizeof(u64),
933 .regset_get = tar_get, .set = tar_set
934 },
935 [REGSET_EBB] = {
936 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
937 .size = sizeof(u64), .align = sizeof(u64),
938 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set
939 },
940#endif
941};
942
943static const struct user_regset_view user_ppc_compat_view = {
944 .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
945 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
946};
947
948const struct user_regset_view *task_user_regset_view(struct task_struct *task)
949{
950 if (IS_ENABLED(CONFIG_COMPAT) && is_tsk_32bit_task(task))
951 return &user_ppc_compat_view;
952 return &user_ppc_native_view;
953}
954

source code of linux/arch/powerpc/kernel/ptrace/ptrace-view.c