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  */
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  */
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 
109 static unsigned long get_user_msr(struct task_struct *task)
110 {
111 	return task->thread.regs->msr | task->thread.fpexc_mode;
112 }
113 
114 static __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
123 static int get_user_dscr(struct task_struct *task, unsigned long *data)
124 {
125 	*data = task->thread.dscr;
126 	return 0;
127 }
128 
129 static 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
136 static int get_user_dscr(struct task_struct *task, unsigned long *data)
137 {
138 	return -EIO;
139 }
140 
141 static 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  */
151 static __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  */
160 int 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  */
198 int 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, data);
205 	if (regno == PT_TRAP)
206 		return set_user_trap(task, data);
207 	if (regno == PT_DSCR)
208 		return set_user_dscr(task, 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 
218 static 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 
238 static 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, &count, &kbuf, &ubuf,
249 				 target->thread.regs,
250 				 0, 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(target, 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, &count, &kbuf, &ubuf, &reg,
276 					 PT_TRAP * sizeof(reg),
277 					 (PT_TRAP + 1) * sizeof(reg));
278 		if (!ret)
279 			ret = set_user_trap(target, reg);
280 	}
281 
282 	if (!ret)
283 		user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
284 					  (PT_TRAP + 1) * sizeof(reg), -1);
285 
286 	return ret;
287 }
288 
289 #ifdef CONFIG_PPC64
290 static int ppr_get(struct task_struct *target, const struct user_regset *regset,
291 		   struct membuf to)
292 {
293 	return membuf_write(&to, &target->thread.regs->ppr, sizeof(u64));
294 }
295 
296 static int ppr_set(struct task_struct *target, const struct user_regset *regset,
297 		   unsigned int pos, unsigned int count, const void *kbuf,
298 		   const void __user *ubuf)
299 {
300 	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
301 				  &target->thread.regs->ppr, 0, sizeof(u64));
302 }
303 
304 static int dscr_get(struct task_struct *target, const struct user_regset *regset,
305 		    struct membuf to)
306 {
307 	return membuf_write(&to, &target->thread.dscr, sizeof(u64));
308 }
309 static int dscr_set(struct task_struct *target, const struct user_regset *regset,
310 		    unsigned int pos, unsigned int count, const void *kbuf,
311 		    const void __user *ubuf)
312 {
313 	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
314 				  &target->thread.dscr, 0, sizeof(u64));
315 }
316 #endif
317 #ifdef CONFIG_PPC_BOOK3S_64
318 static int tar_get(struct task_struct *target, const struct user_regset *regset,
319 		   struct membuf to)
320 {
321 	return membuf_write(&to, &target->thread.tar, sizeof(u64));
322 }
323 static int tar_set(struct task_struct *target, const struct user_regset *regset,
324 		   unsigned int pos, unsigned int count, const void *kbuf,
325 		   const void __user *ubuf)
326 {
327 	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
328 				  &target->thread.tar, 0, sizeof(u64));
329 }
330 
331 static int ebb_active(struct task_struct *target, const struct user_regset *regset)
332 {
333 	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
334 		return -ENODEV;
335 
336 	if (target->thread.used_ebb)
337 		return regset->n;
338 
339 	return 0;
340 }
341 
342 static int ebb_get(struct task_struct *target, const struct user_regset *regset,
343 		   struct membuf to)
344 {
345 	/* Build tests */
346 	BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
347 	BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
348 
349 	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
350 		return -ENODEV;
351 
352 	if (!target->thread.used_ebb)
353 		return -ENODATA;
354 
355 	return membuf_write(&to, &target->thread.ebbrr, 3 * sizeof(unsigned long));
356 }
357 
358 static int ebb_set(struct task_struct *target, const struct user_regset *regset,
359 		   unsigned int pos, unsigned int count, const void *kbuf,
360 		   const void __user *ubuf)
361 {
362 	int ret = 0;
363 
364 	/* Build tests */
365 	BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
366 	BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
367 
368 	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
369 		return -ENODEV;
370 
371 	if (target->thread.used_ebb)
372 		return -ENODATA;
373 
374 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.ebbrr,
375 				 0, sizeof(unsigned long));
376 
377 	if (!ret)
378 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
379 					 &target->thread.ebbhr, sizeof(unsigned long),
380 					 2 * sizeof(unsigned long));
381 
382 	if (!ret)
383 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
384 					 &target->thread.bescr, 2 * sizeof(unsigned long),
385 					 3 * sizeof(unsigned long));
386 
387 	return ret;
388 }
389 static int pmu_active(struct task_struct *target, const struct user_regset *regset)
390 {
391 	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
392 		return -ENODEV;
393 
394 	return regset->n;
395 }
396 
397 static int pmu_get(struct task_struct *target, const struct user_regset *regset,
398 		   struct membuf to)
399 {
400 	/* Build tests */
401 	BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
402 	BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
403 	BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
404 	BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
405 
406 	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
407 		return -ENODEV;
408 
409 	return membuf_write(&to, &target->thread.siar, 5 * sizeof(unsigned long));
410 }
411 
412 static int pmu_set(struct task_struct *target, const struct user_regset *regset,
413 		   unsigned int pos, unsigned int count, const void *kbuf,
414 		   const void __user *ubuf)
415 {
416 	int ret = 0;
417 
418 	/* Build tests */
419 	BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
420 	BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
421 	BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
422 	BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
423 
424 	if (!cpu_has_feature(CPU_FTR_ARCH_207S))
425 		return -ENODEV;
426 
427 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.siar,
428 				 0, sizeof(unsigned long));
429 
430 	if (!ret)
431 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
432 					 &target->thread.sdar, sizeof(unsigned long),
433 					 2 * sizeof(unsigned long));
434 
435 	if (!ret)
436 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
437 					 &target->thread.sier, 2 * sizeof(unsigned long),
438 					 3 * sizeof(unsigned long));
439 
440 	if (!ret)
441 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
442 					 &target->thread.mmcr2, 3 * sizeof(unsigned long),
443 					 4 * sizeof(unsigned long));
444 
445 	if (!ret)
446 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
447 					 &target->thread.mmcr0, 4 * sizeof(unsigned long),
448 					 5 * sizeof(unsigned long));
449 	return ret;
450 }
451 #endif
452 
453 #ifdef CONFIG_PPC_MEM_KEYS
454 static int pkey_active(struct task_struct *target, const struct user_regset *regset)
455 {
456 	if (!arch_pkeys_enabled())
457 		return -ENODEV;
458 
459 	return regset->n;
460 }
461 
462 static int pkey_get(struct task_struct *target, const struct user_regset *regset,
463 		    struct membuf to)
464 {
465 
466 	if (!arch_pkeys_enabled())
467 		return -ENODEV;
468 
469 	membuf_store(&to, target->thread.regs->amr);
470 	membuf_store(&to, target->thread.regs->iamr);
471 	return membuf_store(&to, default_uamor);
472 }
473 
474 static int pkey_set(struct task_struct *target, const struct user_regset *regset,
475 		    unsigned int pos, unsigned int count, const void *kbuf,
476 		    const void __user *ubuf)
477 {
478 	u64 new_amr;
479 	int ret;
480 
481 	if (!arch_pkeys_enabled())
482 		return -ENODEV;
483 
484 	/* Only the AMR can be set from userspace */
485 	if (pos != 0 || count != sizeof(new_amr))
486 		return -EINVAL;
487 
488 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
489 				 &new_amr, 0, sizeof(new_amr));
490 	if (ret)
491 		return ret;
492 
493 	/*
494 	 * UAMOR determines which bits of the AMR can be set from userspace.
495 	 * UAMOR value 0b11 indicates that the AMR value can be modified
496 	 * from userspace. If the kernel is using a specific key, we avoid
497 	 * userspace modifying the AMR value for that key by masking them
498 	 * via UAMOR 0b00.
499 	 *
500 	 * Pick the AMR values for the keys that kernel is using. This
501 	 * will be indicated by the ~default_uamor bits.
502 	 */
503 	target->thread.regs->amr = (new_amr & default_uamor) |
504 		(target->thread.regs->amr & ~default_uamor);
505 
506 	return 0;
507 }
508 #endif /* CONFIG_PPC_MEM_KEYS */
509 
510 static const struct user_regset native_regsets[] = {
511 	[REGSET_GPR] = {
512 		.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
513 		.size = sizeof(long), .align = sizeof(long),
514 		.regset_get = gpr_get, .set = gpr_set
515 	},
516 	[REGSET_FPR] = {
517 		.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
518 		.size = sizeof(double), .align = sizeof(double),
519 		.regset_get = fpr_get, .set = fpr_set
520 	},
521 #ifdef CONFIG_ALTIVEC
522 	[REGSET_VMX] = {
523 		.core_note_type = NT_PPC_VMX, .n = 34,
524 		.size = sizeof(vector128), .align = sizeof(vector128),
525 		.active = vr_active, .regset_get = vr_get, .set = vr_set
526 	},
527 #endif
528 #ifdef CONFIG_VSX
529 	[REGSET_VSX] = {
530 		.core_note_type = NT_PPC_VSX, .n = 32,
531 		.size = sizeof(double), .align = sizeof(double),
532 		.active = vsr_active, .regset_get = vsr_get, .set = vsr_set
533 	},
534 #endif
535 #ifdef CONFIG_SPE
536 	[REGSET_SPE] = {
537 		.core_note_type = NT_PPC_SPE, .n = 35,
538 		.size = sizeof(u32), .align = sizeof(u32),
539 		.active = evr_active, .regset_get = evr_get, .set = evr_set
540 	},
541 #endif
542 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
543 	[REGSET_TM_CGPR] = {
544 		.core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
545 		.size = sizeof(long), .align = sizeof(long),
546 		.active = tm_cgpr_active, .regset_get = tm_cgpr_get, .set = tm_cgpr_set
547 	},
548 	[REGSET_TM_CFPR] = {
549 		.core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
550 		.size = sizeof(double), .align = sizeof(double),
551 		.active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
552 	},
553 	[REGSET_TM_CVMX] = {
554 		.core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
555 		.size = sizeof(vector128), .align = sizeof(vector128),
556 		.active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
557 	},
558 	[REGSET_TM_CVSX] = {
559 		.core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
560 		.size = sizeof(double), .align = sizeof(double),
561 		.active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
562 	},
563 	[REGSET_TM_SPR] = {
564 		.core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
565 		.size = sizeof(u64), .align = sizeof(u64),
566 		.active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
567 	},
568 	[REGSET_TM_CTAR] = {
569 		.core_note_type = NT_PPC_TM_CTAR, .n = 1,
570 		.size = sizeof(u64), .align = sizeof(u64),
571 		.active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
572 	},
573 	[REGSET_TM_CPPR] = {
574 		.core_note_type = NT_PPC_TM_CPPR, .n = 1,
575 		.size = sizeof(u64), .align = sizeof(u64),
576 		.active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
577 	},
578 	[REGSET_TM_CDSCR] = {
579 		.core_note_type = NT_PPC_TM_CDSCR, .n = 1,
580 		.size = sizeof(u64), .align = sizeof(u64),
581 		.active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
582 	},
583 #endif
584 #ifdef CONFIG_PPC64
585 	[REGSET_PPR] = {
586 		.core_note_type = NT_PPC_PPR, .n = 1,
587 		.size = sizeof(u64), .align = sizeof(u64),
588 		.regset_get = ppr_get, .set = ppr_set
589 	},
590 	[REGSET_DSCR] = {
591 		.core_note_type = NT_PPC_DSCR, .n = 1,
592 		.size = sizeof(u64), .align = sizeof(u64),
593 		.regset_get = dscr_get, .set = dscr_set
594 	},
595 #endif
596 #ifdef CONFIG_PPC_BOOK3S_64
597 	[REGSET_TAR] = {
598 		.core_note_type = NT_PPC_TAR, .n = 1,
599 		.size = sizeof(u64), .align = sizeof(u64),
600 		.regset_get = tar_get, .set = tar_set
601 	},
602 	[REGSET_EBB] = {
603 		.core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
604 		.size = sizeof(u64), .align = sizeof(u64),
605 		.active = ebb_active, .regset_get = ebb_get, .set = ebb_set
606 	},
607 	[REGSET_PMR] = {
608 		.core_note_type = NT_PPC_PMU, .n = ELF_NPMU,
609 		.size = sizeof(u64), .align = sizeof(u64),
610 		.active = pmu_active, .regset_get = pmu_get, .set = pmu_set
611 	},
612 #endif
613 #ifdef CONFIG_PPC_MEM_KEYS
614 	[REGSET_PKEY] = {
615 		.core_note_type = NT_PPC_PKEY, .n = ELF_NPKEY,
616 		.size = sizeof(u64), .align = sizeof(u64),
617 		.active = pkey_active, .regset_get = pkey_get, .set = pkey_set
618 	},
619 #endif
620 };
621 
622 const struct user_regset_view user_ppc_native_view = {
623 	.name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
624 	.regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
625 };
626 
627 #include <linux/compat.h>
628 
629 int gpr32_get_common(struct task_struct *target,
630 		     const struct user_regset *regset,
631 		     struct membuf to, unsigned long *regs)
632 {
633 	int i;
634 
635 	for (i = 0; i < PT_MSR; i++)
636 		membuf_store(&to, (u32)regs[i]);
637 	membuf_store(&to, (u32)get_user_msr(target));
638 	for (i++ ; i < PT_REGS_COUNT; i++)
639 		membuf_store(&to, (u32)regs[i]);
640 	return membuf_zero(&to, (ELF_NGREG - PT_REGS_COUNT) * sizeof(u32));
641 }
642 
643 int gpr32_set_common(struct task_struct *target,
644 		     const struct user_regset *regset,
645 		     unsigned int pos, unsigned int count,
646 		     const void *kbuf, const void __user *ubuf,
647 		     unsigned long *regs)
648 {
649 	const compat_ulong_t *k = kbuf;
650 	const compat_ulong_t __user *u = ubuf;
651 	compat_ulong_t reg;
652 
653 	if (!kbuf && !user_read_access_begin(u, count))
654 		return -EFAULT;
655 
656 	pos /= sizeof(reg);
657 	count /= sizeof(reg);
658 
659 	if (kbuf)
660 		for (; count > 0 && pos < PT_MSR; --count)
661 			regs[pos++] = *k++;
662 	else
663 		for (; count > 0 && pos < PT_MSR; --count) {
664 			unsafe_get_user(reg, u++, Efault);
665 			regs[pos++] = reg;
666 		}
667 
668 
669 	if (count > 0 && pos == PT_MSR) {
670 		if (kbuf)
671 			reg = *k++;
672 		else
673 			unsafe_get_user(reg, u++, Efault);
674 		set_user_msr(target, reg);
675 		++pos;
676 		--count;
677 	}
678 
679 	if (kbuf) {
680 		for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
681 			regs[pos++] = *k++;
682 		for (; count > 0 && pos < PT_TRAP; --count, ++pos)
683 			++k;
684 	} else {
685 		for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
686 			unsafe_get_user(reg, u++, Efault);
687 			regs[pos++] = reg;
688 		}
689 		for (; count > 0 && pos < PT_TRAP; --count, ++pos)
690 			unsafe_get_user(reg, u++, Efault);
691 	}
692 
693 	if (count > 0 && pos == PT_TRAP) {
694 		if (kbuf)
695 			reg = *k++;
696 		else
697 			unsafe_get_user(reg, u++, Efault);
698 		set_user_trap(target, reg);
699 		++pos;
700 		--count;
701 	}
702 	if (!kbuf)
703 		user_read_access_end();
704 
705 	kbuf = k;
706 	ubuf = u;
707 	pos *= sizeof(reg);
708 	count *= sizeof(reg);
709 	user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
710 				  (PT_TRAP + 1) * sizeof(reg), -1);
711 	return 0;
712 
713 Efault:
714 	user_read_access_end();
715 	return -EFAULT;
716 }
717 
718 static int gpr32_get(struct task_struct *target,
719 		     const struct user_regset *regset,
720 		     struct membuf to)
721 {
722 	if (target->thread.regs == NULL)
723 		return -EIO;
724 
725 	return gpr32_get_common(target, regset, to,
726 			&target->thread.regs->gpr[0]);
727 }
728 
729 static int gpr32_set(struct task_struct *target,
730 		     const struct user_regset *regset,
731 		     unsigned int pos, unsigned int count,
732 		     const void *kbuf, const void __user *ubuf)
733 {
734 	if (target->thread.regs == NULL)
735 		return -EIO;
736 
737 	return gpr32_set_common(target, regset, pos, count, kbuf, ubuf,
738 			&target->thread.regs->gpr[0]);
739 }
740 
741 /*
742  * These are the regset flavors matching the CONFIG_PPC32 native set.
743  */
744 static const struct user_regset compat_regsets[] = {
745 	[REGSET_GPR] = {
746 		.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
747 		.size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
748 		.regset_get = gpr32_get, .set = gpr32_set
749 	},
750 	[REGSET_FPR] = {
751 		.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
752 		.size = sizeof(double), .align = sizeof(double),
753 		.regset_get = fpr_get, .set = fpr_set
754 	},
755 #ifdef CONFIG_ALTIVEC
756 	[REGSET_VMX] = {
757 		.core_note_type = NT_PPC_VMX, .n = 34,
758 		.size = sizeof(vector128), .align = sizeof(vector128),
759 		.active = vr_active, .regset_get = vr_get, .set = vr_set
760 	},
761 #endif
762 #ifdef CONFIG_SPE
763 	[REGSET_SPE] = {
764 		.core_note_type = NT_PPC_SPE, .n = 35,
765 		.size = sizeof(u32), .align = sizeof(u32),
766 		.active = evr_active, .regset_get = evr_get, .set = evr_set
767 	},
768 #endif
769 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
770 	[REGSET_TM_CGPR] = {
771 		.core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
772 		.size = sizeof(long), .align = sizeof(long),
773 		.active = tm_cgpr_active,
774 		.regset_get = tm_cgpr32_get, .set = tm_cgpr32_set
775 	},
776 	[REGSET_TM_CFPR] = {
777 		.core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
778 		.size = sizeof(double), .align = sizeof(double),
779 		.active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
780 	},
781 	[REGSET_TM_CVMX] = {
782 		.core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
783 		.size = sizeof(vector128), .align = sizeof(vector128),
784 		.active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
785 	},
786 	[REGSET_TM_CVSX] = {
787 		.core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
788 		.size = sizeof(double), .align = sizeof(double),
789 		.active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
790 	},
791 	[REGSET_TM_SPR] = {
792 		.core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
793 		.size = sizeof(u64), .align = sizeof(u64),
794 		.active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
795 	},
796 	[REGSET_TM_CTAR] = {
797 		.core_note_type = NT_PPC_TM_CTAR, .n = 1,
798 		.size = sizeof(u64), .align = sizeof(u64),
799 		.active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
800 	},
801 	[REGSET_TM_CPPR] = {
802 		.core_note_type = NT_PPC_TM_CPPR, .n = 1,
803 		.size = sizeof(u64), .align = sizeof(u64),
804 		.active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
805 	},
806 	[REGSET_TM_CDSCR] = {
807 		.core_note_type = NT_PPC_TM_CDSCR, .n = 1,
808 		.size = sizeof(u64), .align = sizeof(u64),
809 		.active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
810 	},
811 #endif
812 #ifdef CONFIG_PPC64
813 	[REGSET_PPR] = {
814 		.core_note_type = NT_PPC_PPR, .n = 1,
815 		.size = sizeof(u64), .align = sizeof(u64),
816 		.regset_get = ppr_get, .set = ppr_set
817 	},
818 	[REGSET_DSCR] = {
819 		.core_note_type = NT_PPC_DSCR, .n = 1,
820 		.size = sizeof(u64), .align = sizeof(u64),
821 		.regset_get = dscr_get, .set = dscr_set
822 	},
823 #endif
824 #ifdef CONFIG_PPC_BOOK3S_64
825 	[REGSET_TAR] = {
826 		.core_note_type = NT_PPC_TAR, .n = 1,
827 		.size = sizeof(u64), .align = sizeof(u64),
828 		.regset_get = tar_get, .set = tar_set
829 	},
830 	[REGSET_EBB] = {
831 		.core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
832 		.size = sizeof(u64), .align = sizeof(u64),
833 		.active = ebb_active, .regset_get = ebb_get, .set = ebb_set
834 	},
835 #endif
836 };
837 
838 static const struct user_regset_view user_ppc_compat_view = {
839 	.name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
840 	.regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
841 };
842 
843 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
844 {
845 	if (IS_ENABLED(CONFIG_COMPAT) && is_tsk_32bit_task(task))
846 		return &user_ppc_compat_view;
847 	return &user_ppc_native_view;
848 }
849