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
10 struct 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
22 static 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 */
regs_query_register_offset(const char * name)79 int 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 */
regs_query_register_name(unsigned int offset)95 const 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
get_user_msr(struct task_struct * task)109 static unsigned long get_user_msr(struct task_struct *task)
110 {
111 return task->thread.regs->msr | task->thread.fpexc_mode;
112 }
113
set_user_msr(struct task_struct * task,unsigned long msr)114 static __always_inline int set_user_msr(struct task_struct *task, unsigned long msr)
115 {
116 task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
117 task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
118 return 0;
119 }
120
121 #ifdef CONFIG_PPC64
get_user_dscr(struct task_struct * task,unsigned long * data)122 static int get_user_dscr(struct task_struct *task, unsigned long *data)
123 {
124 *data = task->thread.dscr;
125 return 0;
126 }
127
set_user_dscr(struct task_struct * task,unsigned long dscr)128 static int set_user_dscr(struct task_struct *task, unsigned long dscr)
129 {
130 task->thread.dscr = dscr;
131 task->thread.dscr_inherit = 1;
132 return 0;
133 }
134 #else
get_user_dscr(struct task_struct * task,unsigned long * data)135 static int get_user_dscr(struct task_struct *task, unsigned long *data)
136 {
137 return -EIO;
138 }
139
set_user_dscr(struct task_struct * task,unsigned long dscr)140 static int set_user_dscr(struct task_struct *task, unsigned long dscr)
141 {
142 return -EIO;
143 }
144 #endif
145
146 /*
147 * We prevent mucking around with the reserved area of trap
148 * which are used internally by the kernel.
149 */
set_user_trap(struct task_struct * task,unsigned long trap)150 static __always_inline int set_user_trap(struct task_struct *task, unsigned long trap)
151 {
152 set_trap(task->thread.regs, trap);
153 return 0;
154 }
155
156 /*
157 * Get contents of register REGNO in task TASK.
158 */
ptrace_get_reg(struct task_struct * task,int regno,unsigned long * data)159 int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data)
160 {
161 unsigned int regs_max;
162
163 if (task->thread.regs == NULL || !data)
164 return -EIO;
165
166 if (regno == PT_MSR) {
167 *data = get_user_msr(task);
168 return 0;
169 }
170
171 if (regno == PT_DSCR)
172 return get_user_dscr(task, data);
173
174 /*
175 * softe copies paca->irq_soft_mask variable state. Since irq_soft_mask is
176 * no more used as a flag, lets force usr to alway see the softe value as 1
177 * which means interrupts are not soft disabled.
178 */
179 if (IS_ENABLED(CONFIG_PPC64) && regno == PT_SOFTE) {
180 *data = 1;
181 return 0;
182 }
183
184 regs_max = sizeof(struct user_pt_regs) / sizeof(unsigned long);
185 if (regno < regs_max) {
186 regno = array_index_nospec(regno, regs_max);
187 *data = ((unsigned long *)task->thread.regs)[regno];
188 return 0;
189 }
190
191 return -EIO;
192 }
193
194 /*
195 * Write contents of register REGNO in task TASK.
196 */
ptrace_put_reg(struct task_struct * task,int regno,unsigned long data)197 int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
198 {
199 if (task->thread.regs == NULL)
200 return -EIO;
201
202 if (regno == PT_MSR)
203 return set_user_msr(task, data);
204 if (regno == PT_TRAP)
205 return set_user_trap(task, data);
206 if (regno == PT_DSCR)
207 return set_user_dscr(task, data);
208
209 if (regno <= PT_MAX_PUT_REG) {
210 regno = array_index_nospec(regno, PT_MAX_PUT_REG + 1);
211 ((unsigned long *)task->thread.regs)[regno] = data;
212 return 0;
213 }
214 return -EIO;
215 }
216
gpr_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)217 static int gpr_get(struct task_struct *target, const struct user_regset *regset,
218 struct membuf to)
219 {
220 struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr));
221 #ifdef CONFIG_PPC64
222 struct membuf to_softe = membuf_at(&to, offsetof(struct pt_regs, softe));
223 #endif
224 if (target->thread.regs == NULL)
225 return -EIO;
226
227 membuf_write(&to, target->thread.regs, sizeof(struct user_pt_regs));
228
229 membuf_store(&to_msr, get_user_msr(target));
230 #ifdef CONFIG_PPC64
231 membuf_store(&to_softe, 0x1ul);
232 #endif
233 return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) -
234 sizeof(struct user_pt_regs));
235 }
236
gpr_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)237 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
238 unsigned int pos, unsigned int count, const void *kbuf,
239 const void __user *ubuf)
240 {
241 unsigned long reg;
242 int ret;
243
244 if (target->thread.regs == NULL)
245 return -EIO;
246
247 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
248 target->thread.regs,
249 0, PT_MSR * sizeof(reg));
250
251 if (!ret && count > 0) {
252 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®,
253 PT_MSR * sizeof(reg),
254 (PT_MSR + 1) * sizeof(reg));
255 if (!ret)
256 ret = set_user_msr(target, reg);
257 }
258
259 BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
260 offsetof(struct pt_regs, msr) + sizeof(long));
261
262 if (!ret)
263 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
264 &target->thread.regs->orig_gpr3,
265 PT_ORIG_R3 * sizeof(reg),
266 (PT_MAX_PUT_REG + 1) * sizeof(reg));
267
268 if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
269 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
270 (PT_MAX_PUT_REG + 1) * sizeof(reg),
271 PT_TRAP * sizeof(reg));
272
273 if (!ret && count > 0) {
274 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®,
275 PT_TRAP * sizeof(reg),
276 (PT_TRAP + 1) * sizeof(reg));
277 if (!ret)
278 ret = set_user_trap(target, reg);
279 }
280
281 if (!ret)
282 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
283 (PT_TRAP + 1) * sizeof(reg), -1);
284
285 return ret;
286 }
287
288 #ifdef CONFIG_PPC64
ppr_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)289 static int ppr_get(struct task_struct *target, const struct user_regset *regset,
290 struct membuf to)
291 {
292 return membuf_write(&to, &target->thread.regs->ppr, sizeof(u64));
293 }
294
ppr_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)295 static int ppr_set(struct task_struct *target, const struct user_regset *regset,
296 unsigned int pos, unsigned int count, const void *kbuf,
297 const void __user *ubuf)
298 {
299 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
300 &target->thread.regs->ppr, 0, sizeof(u64));
301 }
302
dscr_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)303 static int dscr_get(struct task_struct *target, const struct user_regset *regset,
304 struct membuf to)
305 {
306 return membuf_write(&to, &target->thread.dscr, sizeof(u64));
307 }
dscr_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)308 static int dscr_set(struct task_struct *target, const struct user_regset *regset,
309 unsigned int pos, unsigned int count, const void *kbuf,
310 const void __user *ubuf)
311 {
312 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
313 &target->thread.dscr, 0, sizeof(u64));
314 }
315 #endif
316 #ifdef CONFIG_PPC_BOOK3S_64
tar_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)317 static int tar_get(struct task_struct *target, const struct user_regset *regset,
318 struct membuf to)
319 {
320 return membuf_write(&to, &target->thread.tar, sizeof(u64));
321 }
tar_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)322 static int tar_set(struct task_struct *target, const struct user_regset *regset,
323 unsigned int pos, unsigned int count, const void *kbuf,
324 const void __user *ubuf)
325 {
326 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
327 &target->thread.tar, 0, sizeof(u64));
328 }
329
ebb_active(struct task_struct * target,const struct user_regset * regset)330 static int ebb_active(struct task_struct *target, const struct user_regset *regset)
331 {
332 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
333 return -ENODEV;
334
335 if (target->thread.used_ebb)
336 return regset->n;
337
338 return 0;
339 }
340
ebb_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)341 static int ebb_get(struct task_struct *target, const struct user_regset *regset,
342 struct membuf to)
343 {
344 /* Build tests */
345 BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
346 BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
347
348 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
349 return -ENODEV;
350
351 if (!target->thread.used_ebb)
352 return -ENODATA;
353
354 return membuf_write(&to, &target->thread.ebbrr, 3 * sizeof(unsigned long));
355 }
356
ebb_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)357 static int ebb_set(struct task_struct *target, const struct user_regset *regset,
358 unsigned int pos, unsigned int count, const void *kbuf,
359 const void __user *ubuf)
360 {
361 int ret = 0;
362
363 /* Build tests */
364 BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
365 BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
366
367 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
368 return -ENODEV;
369
370 if (target->thread.used_ebb)
371 return -ENODATA;
372
373 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.ebbrr,
374 0, sizeof(unsigned long));
375
376 if (!ret)
377 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
378 &target->thread.ebbhr, sizeof(unsigned long),
379 2 * sizeof(unsigned long));
380
381 if (!ret)
382 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
383 &target->thread.bescr, 2 * sizeof(unsigned long),
384 3 * sizeof(unsigned long));
385
386 return ret;
387 }
pmu_active(struct task_struct * target,const struct user_regset * regset)388 static int pmu_active(struct task_struct *target, const struct user_regset *regset)
389 {
390 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
391 return -ENODEV;
392
393 return regset->n;
394 }
395
pmu_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)396 static int pmu_get(struct task_struct *target, const struct user_regset *regset,
397 struct membuf to)
398 {
399 /* Build tests */
400 BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
401 BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
402 BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
403 BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
404
405 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
406 return -ENODEV;
407
408 return membuf_write(&to, &target->thread.siar, 5 * sizeof(unsigned long));
409 }
410
pmu_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)411 static int pmu_set(struct task_struct *target, const struct user_regset *regset,
412 unsigned int pos, unsigned int count, const void *kbuf,
413 const void __user *ubuf)
414 {
415 int ret = 0;
416
417 /* Build tests */
418 BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
419 BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
420 BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
421 BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
422
423 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
424 return -ENODEV;
425
426 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.siar,
427 0, sizeof(unsigned long));
428
429 if (!ret)
430 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
431 &target->thread.sdar, sizeof(unsigned long),
432 2 * sizeof(unsigned long));
433
434 if (!ret)
435 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
436 &target->thread.sier, 2 * sizeof(unsigned long),
437 3 * sizeof(unsigned long));
438
439 if (!ret)
440 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
441 &target->thread.mmcr2, 3 * sizeof(unsigned long),
442 4 * sizeof(unsigned long));
443
444 if (!ret)
445 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
446 &target->thread.mmcr0, 4 * sizeof(unsigned long),
447 5 * sizeof(unsigned long));
448 return ret;
449 }
450 #endif
451
452 #ifdef CONFIG_PPC_MEM_KEYS
pkey_active(struct task_struct * target,const struct user_regset * regset)453 static int pkey_active(struct task_struct *target, const struct user_regset *regset)
454 {
455 if (!arch_pkeys_enabled())
456 return -ENODEV;
457
458 return regset->n;
459 }
460
pkey_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)461 static int pkey_get(struct task_struct *target, const struct user_regset *regset,
462 struct membuf to)
463 {
464
465 if (!arch_pkeys_enabled())
466 return -ENODEV;
467
468 membuf_store(&to, target->thread.regs->amr);
469 membuf_store(&to, target->thread.regs->iamr);
470 return membuf_store(&to, default_uamor);
471 }
472
pkey_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)473 static int pkey_set(struct task_struct *target, const struct user_regset *regset,
474 unsigned int pos, unsigned int count, const void *kbuf,
475 const void __user *ubuf)
476 {
477 u64 new_amr;
478 int ret;
479
480 if (!arch_pkeys_enabled())
481 return -ENODEV;
482
483 /* Only the AMR can be set from userspace */
484 if (pos != 0 || count != sizeof(new_amr))
485 return -EINVAL;
486
487 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
488 &new_amr, 0, sizeof(new_amr));
489 if (ret)
490 return ret;
491
492 /*
493 * UAMOR determines which bits of the AMR can be set from userspace.
494 * UAMOR value 0b11 indicates that the AMR value can be modified
495 * from userspace. If the kernel is using a specific key, we avoid
496 * userspace modifying the AMR value for that key by masking them
497 * via UAMOR 0b00.
498 *
499 * Pick the AMR values for the keys that kernel is using. This
500 * will be indicated by the ~default_uamor bits.
501 */
502 target->thread.regs->amr = (new_amr & default_uamor) |
503 (target->thread.regs->amr & ~default_uamor);
504
505 return 0;
506 }
507 #endif /* CONFIG_PPC_MEM_KEYS */
508
509 static const struct user_regset native_regsets[] = {
510 [REGSET_GPR] = {
511 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
512 .size = sizeof(long), .align = sizeof(long),
513 .regset_get = gpr_get, .set = gpr_set
514 },
515 [REGSET_FPR] = {
516 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
517 .size = sizeof(double), .align = sizeof(double),
518 .regset_get = fpr_get, .set = fpr_set
519 },
520 #ifdef CONFIG_ALTIVEC
521 [REGSET_VMX] = {
522 .core_note_type = NT_PPC_VMX, .n = 34,
523 .size = sizeof(vector128), .align = sizeof(vector128),
524 .active = vr_active, .regset_get = vr_get, .set = vr_set
525 },
526 #endif
527 #ifdef CONFIG_VSX
528 [REGSET_VSX] = {
529 .core_note_type = NT_PPC_VSX, .n = 32,
530 .size = sizeof(double), .align = sizeof(double),
531 .active = vsr_active, .regset_get = vsr_get, .set = vsr_set
532 },
533 #endif
534 #ifdef CONFIG_SPE
535 [REGSET_SPE] = {
536 .core_note_type = NT_PPC_SPE, .n = 35,
537 .size = sizeof(u32), .align = sizeof(u32),
538 .active = evr_active, .regset_get = evr_get, .set = evr_set
539 },
540 #endif
541 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
542 [REGSET_TM_CGPR] = {
543 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
544 .size = sizeof(long), .align = sizeof(long),
545 .active = tm_cgpr_active, .regset_get = tm_cgpr_get, .set = tm_cgpr_set
546 },
547 [REGSET_TM_CFPR] = {
548 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
549 .size = sizeof(double), .align = sizeof(double),
550 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
551 },
552 [REGSET_TM_CVMX] = {
553 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
554 .size = sizeof(vector128), .align = sizeof(vector128),
555 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
556 },
557 [REGSET_TM_CVSX] = {
558 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
559 .size = sizeof(double), .align = sizeof(double),
560 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
561 },
562 [REGSET_TM_SPR] = {
563 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
564 .size = sizeof(u64), .align = sizeof(u64),
565 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
566 },
567 [REGSET_TM_CTAR] = {
568 .core_note_type = NT_PPC_TM_CTAR, .n = 1,
569 .size = sizeof(u64), .align = sizeof(u64),
570 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
571 },
572 [REGSET_TM_CPPR] = {
573 .core_note_type = NT_PPC_TM_CPPR, .n = 1,
574 .size = sizeof(u64), .align = sizeof(u64),
575 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
576 },
577 [REGSET_TM_CDSCR] = {
578 .core_note_type = NT_PPC_TM_CDSCR, .n = 1,
579 .size = sizeof(u64), .align = sizeof(u64),
580 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
581 },
582 #endif
583 #ifdef CONFIG_PPC64
584 [REGSET_PPR] = {
585 .core_note_type = NT_PPC_PPR, .n = 1,
586 .size = sizeof(u64), .align = sizeof(u64),
587 .regset_get = ppr_get, .set = ppr_set
588 },
589 [REGSET_DSCR] = {
590 .core_note_type = NT_PPC_DSCR, .n = 1,
591 .size = sizeof(u64), .align = sizeof(u64),
592 .regset_get = dscr_get, .set = dscr_set
593 },
594 #endif
595 #ifdef CONFIG_PPC_BOOK3S_64
596 [REGSET_TAR] = {
597 .core_note_type = NT_PPC_TAR, .n = 1,
598 .size = sizeof(u64), .align = sizeof(u64),
599 .regset_get = tar_get, .set = tar_set
600 },
601 [REGSET_EBB] = {
602 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
603 .size = sizeof(u64), .align = sizeof(u64),
604 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set
605 },
606 [REGSET_PMR] = {
607 .core_note_type = NT_PPC_PMU, .n = ELF_NPMU,
608 .size = sizeof(u64), .align = sizeof(u64),
609 .active = pmu_active, .regset_get = pmu_get, .set = pmu_set
610 },
611 #endif
612 #ifdef CONFIG_PPC_MEM_KEYS
613 [REGSET_PKEY] = {
614 .core_note_type = NT_PPC_PKEY, .n = ELF_NPKEY,
615 .size = sizeof(u64), .align = sizeof(u64),
616 .active = pkey_active, .regset_get = pkey_get, .set = pkey_set
617 },
618 #endif
619 };
620
621 const struct user_regset_view user_ppc_native_view = {
622 .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
623 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
624 };
625
626 #include <linux/compat.h>
627
gpr32_get_common(struct task_struct * target,const struct user_regset * regset,struct membuf to,unsigned long * regs)628 int gpr32_get_common(struct task_struct *target,
629 const struct user_regset *regset,
630 struct membuf to, unsigned long *regs)
631 {
632 int i;
633
634 for (i = 0; i < PT_MSR; i++)
635 membuf_store(&to, (u32)regs[i]);
636 membuf_store(&to, (u32)get_user_msr(target));
637 for (i++ ; i < PT_REGS_COUNT; i++)
638 membuf_store(&to, (u32)regs[i]);
639 return membuf_zero(&to, (ELF_NGREG - PT_REGS_COUNT) * sizeof(u32));
640 }
641
gpr32_set_common(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf,unsigned long * regs)642 int gpr32_set_common(struct task_struct *target,
643 const struct user_regset *regset,
644 unsigned int pos, unsigned int count,
645 const void *kbuf, const void __user *ubuf,
646 unsigned long *regs)
647 {
648 const compat_ulong_t *k = kbuf;
649 const compat_ulong_t __user *u = ubuf;
650 compat_ulong_t reg;
651
652 if (!kbuf && !user_read_access_begin(u, count))
653 return -EFAULT;
654
655 pos /= sizeof(reg);
656 count /= sizeof(reg);
657
658 if (kbuf)
659 for (; count > 0 && pos < PT_MSR; --count)
660 regs[pos++] = *k++;
661 else
662 for (; count > 0 && pos < PT_MSR; --count) {
663 unsafe_get_user(reg, u++, Efault);
664 regs[pos++] = reg;
665 }
666
667
668 if (count > 0 && pos == PT_MSR) {
669 if (kbuf)
670 reg = *k++;
671 else
672 unsafe_get_user(reg, u++, Efault);
673 set_user_msr(target, reg);
674 ++pos;
675 --count;
676 }
677
678 if (kbuf) {
679 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
680 regs[pos++] = *k++;
681 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
682 ++k;
683 } else {
684 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
685 unsafe_get_user(reg, u++, Efault);
686 regs[pos++] = reg;
687 }
688 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
689 unsafe_get_user(reg, u++, Efault);
690 }
691
692 if (count > 0 && pos == PT_TRAP) {
693 if (kbuf)
694 reg = *k++;
695 else
696 unsafe_get_user(reg, u++, Efault);
697 set_user_trap(target, reg);
698 ++pos;
699 --count;
700 }
701 if (!kbuf)
702 user_read_access_end();
703
704 kbuf = k;
705 ubuf = u;
706 pos *= sizeof(reg);
707 count *= sizeof(reg);
708 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
709 (PT_TRAP + 1) * sizeof(reg), -1);
710
711 Efault:
712 user_read_access_end();
713 return -EFAULT;
714 }
715
gpr32_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)716 static int gpr32_get(struct task_struct *target,
717 const struct user_regset *regset,
718 struct membuf to)
719 {
720 if (target->thread.regs == NULL)
721 return -EIO;
722
723 return gpr32_get_common(target, regset, to,
724 &target->thread.regs->gpr[0]);
725 }
726
gpr32_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)727 static int gpr32_set(struct task_struct *target,
728 const struct user_regset *regset,
729 unsigned int pos, unsigned int count,
730 const void *kbuf, const void __user *ubuf)
731 {
732 if (target->thread.regs == NULL)
733 return -EIO;
734
735 return gpr32_set_common(target, regset, pos, count, kbuf, ubuf,
736 &target->thread.regs->gpr[0]);
737 }
738
739 /*
740 * These are the regset flavors matching the CONFIG_PPC32 native set.
741 */
742 static const struct user_regset compat_regsets[] = {
743 [REGSET_GPR] = {
744 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
745 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
746 .regset_get = gpr32_get, .set = gpr32_set
747 },
748 [REGSET_FPR] = {
749 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
750 .size = sizeof(double), .align = sizeof(double),
751 .regset_get = fpr_get, .set = fpr_set
752 },
753 #ifdef CONFIG_ALTIVEC
754 [REGSET_VMX] = {
755 .core_note_type = NT_PPC_VMX, .n = 34,
756 .size = sizeof(vector128), .align = sizeof(vector128),
757 .active = vr_active, .regset_get = vr_get, .set = vr_set
758 },
759 #endif
760 #ifdef CONFIG_SPE
761 [REGSET_SPE] = {
762 .core_note_type = NT_PPC_SPE, .n = 35,
763 .size = sizeof(u32), .align = sizeof(u32),
764 .active = evr_active, .regset_get = evr_get, .set = evr_set
765 },
766 #endif
767 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
768 [REGSET_TM_CGPR] = {
769 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
770 .size = sizeof(long), .align = sizeof(long),
771 .active = tm_cgpr_active,
772 .regset_get = tm_cgpr32_get, .set = tm_cgpr32_set
773 },
774 [REGSET_TM_CFPR] = {
775 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
776 .size = sizeof(double), .align = sizeof(double),
777 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
778 },
779 [REGSET_TM_CVMX] = {
780 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
781 .size = sizeof(vector128), .align = sizeof(vector128),
782 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
783 },
784 [REGSET_TM_CVSX] = {
785 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
786 .size = sizeof(double), .align = sizeof(double),
787 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
788 },
789 [REGSET_TM_SPR] = {
790 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
791 .size = sizeof(u64), .align = sizeof(u64),
792 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
793 },
794 [REGSET_TM_CTAR] = {
795 .core_note_type = NT_PPC_TM_CTAR, .n = 1,
796 .size = sizeof(u64), .align = sizeof(u64),
797 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
798 },
799 [REGSET_TM_CPPR] = {
800 .core_note_type = NT_PPC_TM_CPPR, .n = 1,
801 .size = sizeof(u64), .align = sizeof(u64),
802 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
803 },
804 [REGSET_TM_CDSCR] = {
805 .core_note_type = NT_PPC_TM_CDSCR, .n = 1,
806 .size = sizeof(u64), .align = sizeof(u64),
807 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
808 },
809 #endif
810 #ifdef CONFIG_PPC64
811 [REGSET_PPR] = {
812 .core_note_type = NT_PPC_PPR, .n = 1,
813 .size = sizeof(u64), .align = sizeof(u64),
814 .regset_get = ppr_get, .set = ppr_set
815 },
816 [REGSET_DSCR] = {
817 .core_note_type = NT_PPC_DSCR, .n = 1,
818 .size = sizeof(u64), .align = sizeof(u64),
819 .regset_get = dscr_get, .set = dscr_set
820 },
821 #endif
822 #ifdef CONFIG_PPC_BOOK3S_64
823 [REGSET_TAR] = {
824 .core_note_type = NT_PPC_TAR, .n = 1,
825 .size = sizeof(u64), .align = sizeof(u64),
826 .regset_get = tar_get, .set = tar_set
827 },
828 [REGSET_EBB] = {
829 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
830 .size = sizeof(u64), .align = sizeof(u64),
831 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set
832 },
833 #endif
834 };
835
836 static const struct user_regset_view user_ppc_compat_view = {
837 .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
838 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
839 };
840
task_user_regset_view(struct task_struct * task)841 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
842 {
843 if (IS_ENABLED(CONFIG_PPC64) && test_tsk_thread_flag(task, TIF_32BIT))
844 return &user_ppc_compat_view;
845 return &user_ppc_native_view;
846 }
847