1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1992 Ross Biro
7 * Copyright (C) Linus Torvalds
8 * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
9 * Copyright (C) 1996 David S. Miller
10 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
11 * Copyright (C) 1999 MIPS Technologies, Inc.
12 * Copyright (C) 2000 Ulf Carlsson
13 *
14 * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
15 * binaries.
16 */
17#include <linux/compiler.h>
18#include <linux/context_tracking.h>
19#include <linux/elf.h>
20#include <linux/kernel.h>
21#include <linux/sched.h>
22#include <linux/sched/task_stack.h>
23#include <linux/mm.h>
24#include <linux/errno.h>
25#include <linux/ptrace.h>
26#include <linux/regset.h>
27#include <linux/smp.h>
28#include <linux/security.h>
29#include <linux/stddef.h>
30#include <linux/audit.h>
31#include <linux/seccomp.h>
32#include <linux/ftrace.h>
33
34#include <asm/branch.h>
35#include <asm/byteorder.h>
36#include <asm/cpu.h>
37#include <asm/cpu-info.h>
38#include <asm/dsp.h>
39#include <asm/fpu.h>
40#include <asm/mipsregs.h>
41#include <asm/mipsmtregs.h>
42#include <asm/page.h>
43#include <asm/processor.h>
44#include <asm/syscall.h>
45#include <linux/uaccess.h>
46#include <asm/bootinfo.h>
47#include <asm/reg.h>
48
49#define CREATE_TRACE_POINTS
50#include <trace/events/syscalls.h>
51
52unsigned long exception_ip(struct pt_regs *regs)
53{
54 return exception_epc(regs);
55}
56EXPORT_SYMBOL(exception_ip);
57
58/*
59 * Called by kernel/ptrace.c when detaching..
60 *
61 * Make sure single step bits etc are not set.
62 */
63void ptrace_disable(struct task_struct *child)
64{
65 /* Don't load the watchpoint registers for the ex-child. */
66 clear_tsk_thread_flag(tsk: child, flag: TIF_LOAD_WATCH);
67}
68
69/*
70 * Read a general register set. We always use the 64-bit format, even
71 * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
72 * Registers are sign extended to fill the available space.
73 */
74int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data)
75{
76 struct pt_regs *regs;
77 int i;
78
79 if (!access_ok(data, 38 * 8))
80 return -EIO;
81
82 regs = task_pt_regs(child);
83
84 for (i = 0; i < 32; i++)
85 __put_user((long)regs->regs[i], (__s64 __user *)&data->regs[i]);
86 __put_user((long)regs->lo, (__s64 __user *)&data->lo);
87 __put_user((long)regs->hi, (__s64 __user *)&data->hi);
88 __put_user((long)regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
89 __put_user((long)regs->cp0_badvaddr, (__s64 __user *)&data->cp0_badvaddr);
90 __put_user((long)regs->cp0_status, (__s64 __user *)&data->cp0_status);
91 __put_user((long)regs->cp0_cause, (__s64 __user *)&data->cp0_cause);
92
93 return 0;
94}
95
96/*
97 * Write a general register set. As for PTRACE_GETREGS, we always use
98 * the 64-bit format. On a 32-bit kernel only the lower order half
99 * (according to endianness) will be used.
100 */
101int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data)
102{
103 struct pt_regs *regs;
104 int i;
105
106 if (!access_ok(data, 38 * 8))
107 return -EIO;
108
109 regs = task_pt_regs(child);
110
111 for (i = 0; i < 32; i++)
112 __get_user(regs->regs[i], (__s64 __user *)&data->regs[i]);
113 __get_user(regs->lo, (__s64 __user *)&data->lo);
114 __get_user(regs->hi, (__s64 __user *)&data->hi);
115 __get_user(regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
116
117 /* badvaddr, status, and cause may not be written. */
118
119 /* System call number may have been changed */
120 mips_syscall_update_nr(child, regs);
121
122 return 0;
123}
124
125int ptrace_get_watch_regs(struct task_struct *child,
126 struct pt_watch_regs __user *addr)
127{
128 enum pt_watch_style style;
129 int i;
130
131 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
132 return -EIO;
133 if (!access_ok(addr, sizeof(struct pt_watch_regs)))
134 return -EIO;
135
136#ifdef CONFIG_32BIT
137 style = pt_watch_style_mips32;
138#define WATCH_STYLE mips32
139#else
140 style = pt_watch_style_mips64;
141#define WATCH_STYLE mips64
142#endif
143
144 __put_user(style, &addr->style);
145 __put_user(boot_cpu_data.watch_reg_use_cnt,
146 &addr->WATCH_STYLE.num_valid);
147 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
148 __put_user(child->thread.watch.mips3264.watchlo[i],
149 &addr->WATCH_STYLE.watchlo[i]);
150 __put_user(child->thread.watch.mips3264.watchhi[i] &
151 (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW),
152 &addr->WATCH_STYLE.watchhi[i]);
153 __put_user(boot_cpu_data.watch_reg_masks[i],
154 &addr->WATCH_STYLE.watch_masks[i]);
155 }
156 for (; i < 8; i++) {
157 __put_user(0, &addr->WATCH_STYLE.watchlo[i]);
158 __put_user(0, &addr->WATCH_STYLE.watchhi[i]);
159 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]);
160 }
161
162 return 0;
163}
164
165int ptrace_set_watch_regs(struct task_struct *child,
166 struct pt_watch_regs __user *addr)
167{
168 int i;
169 int watch_active = 0;
170 unsigned long lt[NUM_WATCH_REGS];
171 u16 ht[NUM_WATCH_REGS];
172
173 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
174 return -EIO;
175 if (!access_ok(addr, sizeof(struct pt_watch_regs)))
176 return -EIO;
177 /* Check the values. */
178 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
179 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]);
180#ifdef CONFIG_32BIT
181 if (lt[i] & __UA_LIMIT)
182 return -EINVAL;
183#else
184 if (test_tsk_thread_flag(tsk: child, flag: TIF_32BIT_ADDR)) {
185 if (lt[i] & 0xffffffff80000000UL)
186 return -EINVAL;
187 } else {
188 if (lt[i] & __UA_LIMIT)
189 return -EINVAL;
190 }
191#endif
192 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
193 if (ht[i] & ~MIPS_WATCHHI_MASK)
194 return -EINVAL;
195 }
196 /* Install them. */
197 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
198 if (lt[i] & MIPS_WATCHLO_IRW)
199 watch_active = 1;
200 child->thread.watch.mips3264.watchlo[i] = lt[i];
201 /* Set the G bit. */
202 child->thread.watch.mips3264.watchhi[i] = ht[i];
203 }
204
205 if (watch_active)
206 set_tsk_thread_flag(tsk: child, flag: TIF_LOAD_WATCH);
207 else
208 clear_tsk_thread_flag(tsk: child, flag: TIF_LOAD_WATCH);
209
210 return 0;
211}
212
213/* regset get/set implementations */
214
215#if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
216
217static int gpr32_get(struct task_struct *target,
218 const struct user_regset *regset,
219 struct membuf to)
220{
221 struct pt_regs *regs = task_pt_regs(target);
222 u32 uregs[ELF_NGREG] = {};
223
224 mips_dump_regs32(uregs, regs);
225 return membuf_write(&to, uregs, sizeof(uregs));
226}
227
228static int gpr32_set(struct task_struct *target,
229 const struct user_regset *regset,
230 unsigned int pos, unsigned int count,
231 const void *kbuf, const void __user *ubuf)
232{
233 struct pt_regs *regs = task_pt_regs(target);
234 u32 uregs[ELF_NGREG];
235 unsigned start, num_regs, i;
236 int err;
237
238 start = pos / sizeof(u32);
239 num_regs = count / sizeof(u32);
240
241 if (start + num_regs > ELF_NGREG)
242 return -EIO;
243
244 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
245 sizeof(uregs));
246 if (err)
247 return err;
248
249 for (i = start; i < num_regs; i++) {
250 /*
251 * Cast all values to signed here so that if this is a 64-bit
252 * kernel, the supplied 32-bit values will be sign extended.
253 */
254 switch (i) {
255 case MIPS32_EF_R1 ... MIPS32_EF_R25:
256 /* k0/k1 are ignored. */
257 case MIPS32_EF_R28 ... MIPS32_EF_R31:
258 regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i];
259 break;
260 case MIPS32_EF_LO:
261 regs->lo = (s32)uregs[i];
262 break;
263 case MIPS32_EF_HI:
264 regs->hi = (s32)uregs[i];
265 break;
266 case MIPS32_EF_CP0_EPC:
267 regs->cp0_epc = (s32)uregs[i];
268 break;
269 }
270 }
271
272 /* System call number may have been changed */
273 mips_syscall_update_nr(target, regs);
274
275 return 0;
276}
277
278#endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
279
280#ifdef CONFIG_64BIT
281
282static int gpr64_get(struct task_struct *target,
283 const struct user_regset *regset,
284 struct membuf to)
285{
286 struct pt_regs *regs = task_pt_regs(target);
287 u64 uregs[ELF_NGREG] = {};
288
289 mips_dump_regs64(uregs, regs);
290 return membuf_write(s: &to, v: uregs, size: sizeof(uregs));
291}
292
293static int gpr64_set(struct task_struct *target,
294 const struct user_regset *regset,
295 unsigned int pos, unsigned int count,
296 const void *kbuf, const void __user *ubuf)
297{
298 struct pt_regs *regs = task_pt_regs(target);
299 u64 uregs[ELF_NGREG];
300 unsigned start, num_regs, i;
301 int err;
302
303 start = pos / sizeof(u64);
304 num_regs = count / sizeof(u64);
305
306 if (start + num_regs > ELF_NGREG)
307 return -EIO;
308
309 err = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, data: uregs, start_pos: 0,
310 end_pos: sizeof(uregs));
311 if (err)
312 return err;
313
314 for (i = start; i < num_regs; i++) {
315 switch (i) {
316 case MIPS64_EF_R1 ... MIPS64_EF_R25:
317 /* k0/k1 are ignored. */
318 case MIPS64_EF_R28 ... MIPS64_EF_R31:
319 regs->regs[i - MIPS64_EF_R0] = uregs[i];
320 break;
321 case MIPS64_EF_LO:
322 regs->lo = uregs[i];
323 break;
324 case MIPS64_EF_HI:
325 regs->hi = uregs[i];
326 break;
327 case MIPS64_EF_CP0_EPC:
328 regs->cp0_epc = uregs[i];
329 break;
330 }
331 }
332
333 /* System call number may have been changed */
334 mips_syscall_update_nr(target, regs);
335
336 return 0;
337}
338
339#endif /* CONFIG_64BIT */
340
341
342#ifdef CONFIG_MIPS_FP_SUPPORT
343
344/*
345 * Poke at FCSR according to its mask. Set the Cause bits even
346 * if a corresponding Enable bit is set. This will be noticed at
347 * the time the thread is switched to and SIGFPE thrown accordingly.
348 */
349static void ptrace_setfcr31(struct task_struct *child, u32 value)
350{
351 u32 fcr31;
352 u32 mask;
353
354 fcr31 = child->thread.fpu.fcr31;
355 mask = boot_cpu_data.fpu_msk31;
356 child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask);
357}
358
359int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
360{
361 int i;
362
363 if (!access_ok(data, 33 * 8))
364 return -EIO;
365
366 if (tsk_used_math(child)) {
367 union fpureg *fregs = get_fpu_regs(child);
368 for (i = 0; i < 32; i++)
369 __put_user(get_fpr64(&fregs[i], 0),
370 i + (__u64 __user *)data);
371 } else {
372 for (i = 0; i < 32; i++)
373 __put_user((__u64) -1, i + (__u64 __user *) data);
374 }
375
376 __put_user(child->thread.fpu.fcr31, data + 64);
377 __put_user(boot_cpu_data.fpu_id, data + 65);
378
379 return 0;
380}
381
382int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
383{
384 union fpureg *fregs;
385 u64 fpr_val;
386 u32 value;
387 int i;
388
389 if (!access_ok(data, 33 * 8))
390 return -EIO;
391
392 init_fp_ctx(child);
393 fregs = get_fpu_regs(child);
394
395 for (i = 0; i < 32; i++) {
396 __get_user(fpr_val, i + (__u64 __user *)data);
397 set_fpr64(&fregs[i], 0, fpr_val);
398 }
399
400 __get_user(value, data + 64);
401 ptrace_setfcr31(child, value);
402
403 /* FIR may not be written. */
404
405 return 0;
406}
407
408/*
409 * Copy the floating-point context to the supplied NT_PRFPREG buffer,
410 * !CONFIG_CPU_HAS_MSA variant. FP context's general register slots
411 * correspond 1:1 to buffer slots. Only general registers are copied.
412 */
413static void fpr_get_fpa(struct task_struct *target,
414 struct membuf *to)
415{
416 membuf_write(to, &target->thread.fpu,
417 NUM_FPU_REGS * sizeof(elf_fpreg_t));
418}
419
420/*
421 * Copy the floating-point context to the supplied NT_PRFPREG buffer,
422 * CONFIG_CPU_HAS_MSA variant. Only lower 64 bits of FP context's
423 * general register slots are copied to buffer slots. Only general
424 * registers are copied.
425 */
426static void fpr_get_msa(struct task_struct *target, struct membuf *to)
427{
428 unsigned int i;
429
430 BUILD_BUG_ON(sizeof(u64) != sizeof(elf_fpreg_t));
431 for (i = 0; i < NUM_FPU_REGS; i++)
432 membuf_store(to, get_fpr64(&target->thread.fpu.fpr[i], 0));
433}
434
435/*
436 * Copy the floating-point context to the supplied NT_PRFPREG buffer.
437 * Choose the appropriate helper for general registers, and then copy
438 * the FCSR and FIR registers separately.
439 */
440static int fpr_get(struct task_struct *target,
441 const struct user_regset *regset,
442 struct membuf to)
443{
444 if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
445 fpr_get_fpa(target, &to);
446 else
447 fpr_get_msa(target, &to);
448
449 membuf_write(&to, &target->thread.fpu.fcr31, sizeof(u32));
450 membuf_write(&to, &boot_cpu_data.fpu_id, sizeof(u32));
451 return 0;
452}
453
454/*
455 * Copy the supplied NT_PRFPREG buffer to the floating-point context,
456 * !CONFIG_CPU_HAS_MSA variant. Buffer slots correspond 1:1 to FP
457 * context's general register slots. Only general registers are copied.
458 */
459static int fpr_set_fpa(struct task_struct *target,
460 unsigned int *pos, unsigned int *count,
461 const void **kbuf, const void __user **ubuf)
462{
463 return user_regset_copyin(pos, count, kbuf, ubuf,
464 &target->thread.fpu,
465 0, NUM_FPU_REGS * sizeof(elf_fpreg_t));
466}
467
468/*
469 * Copy the supplied NT_PRFPREG buffer to the floating-point context,
470 * CONFIG_CPU_HAS_MSA variant. Buffer slots are copied to lower 64
471 * bits only of FP context's general register slots. Only general
472 * registers are copied.
473 */
474static int fpr_set_msa(struct task_struct *target,
475 unsigned int *pos, unsigned int *count,
476 const void **kbuf, const void __user **ubuf)
477{
478 unsigned int i;
479 u64 fpr_val;
480 int err;
481
482 BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
483 for (i = 0; i < NUM_FPU_REGS && *count > 0; i++) {
484 err = user_regset_copyin(pos, count, kbuf, ubuf,
485 &fpr_val, i * sizeof(elf_fpreg_t),
486 (i + 1) * sizeof(elf_fpreg_t));
487 if (err)
488 return err;
489 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
490 }
491
492 return 0;
493}
494
495/*
496 * Copy the supplied NT_PRFPREG buffer to the floating-point context.
497 * Choose the appropriate helper for general registers, and then copy
498 * the FCSR register separately. Ignore the incoming FIR register
499 * contents though, as the register is read-only.
500 *
501 * We optimize for the case where `count % sizeof(elf_fpreg_t) == 0',
502 * which is supposed to have been guaranteed by the kernel before
503 * calling us, e.g. in `ptrace_regset'. We enforce that requirement,
504 * so that we can safely avoid preinitializing temporaries for
505 * partial register writes.
506 */
507static int fpr_set(struct task_struct *target,
508 const struct user_regset *regset,
509 unsigned int pos, unsigned int count,
510 const void *kbuf, const void __user *ubuf)
511{
512 const int fcr31_pos = NUM_FPU_REGS * sizeof(elf_fpreg_t);
513 const int fir_pos = fcr31_pos + sizeof(u32);
514 u32 fcr31;
515 int err;
516
517 BUG_ON(count % sizeof(elf_fpreg_t));
518
519 if (pos + count > sizeof(elf_fpregset_t))
520 return -EIO;
521
522 init_fp_ctx(target);
523
524 if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
525 err = fpr_set_fpa(target, &pos, &count, &kbuf, &ubuf);
526 else
527 err = fpr_set_msa(target, &pos, &count, &kbuf, &ubuf);
528 if (err)
529 return err;
530
531 if (count > 0) {
532 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
533 &fcr31,
534 fcr31_pos, fcr31_pos + sizeof(u32));
535 if (err)
536 return err;
537
538 ptrace_setfcr31(target, fcr31);
539 }
540
541 if (count > 0) {
542 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
543 fir_pos, fir_pos + sizeof(u32));
544 return 0;
545 }
546
547 return err;
548}
549
550/* Copy the FP mode setting to the supplied NT_MIPS_FP_MODE buffer. */
551static int fp_mode_get(struct task_struct *target,
552 const struct user_regset *regset,
553 struct membuf to)
554{
555 return membuf_store(&to, (int)mips_get_process_fp_mode(target));
556}
557
558/*
559 * Copy the supplied NT_MIPS_FP_MODE buffer to the FP mode setting.
560 *
561 * We optimize for the case where `count % sizeof(int) == 0', which
562 * is supposed to have been guaranteed by the kernel before calling
563 * us, e.g. in `ptrace_regset'. We enforce that requirement, so
564 * that we can safely avoid preinitializing temporaries for partial
565 * mode writes.
566 */
567static int fp_mode_set(struct task_struct *target,
568 const struct user_regset *regset,
569 unsigned int pos, unsigned int count,
570 const void *kbuf, const void __user *ubuf)
571{
572 int fp_mode;
573 int err;
574
575 BUG_ON(count % sizeof(int));
576
577 if (pos + count > sizeof(fp_mode))
578 return -EIO;
579
580 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fp_mode, 0,
581 sizeof(fp_mode));
582 if (err)
583 return err;
584
585 if (count > 0)
586 err = mips_set_process_fp_mode(target, fp_mode);
587
588 return err;
589}
590
591#endif /* CONFIG_MIPS_FP_SUPPORT */
592
593#ifdef CONFIG_CPU_HAS_MSA
594
595struct msa_control_regs {
596 unsigned int fir;
597 unsigned int fcsr;
598 unsigned int msair;
599 unsigned int msacsr;
600};
601
602static void copy_pad_fprs(struct task_struct *target,
603 const struct user_regset *regset,
604 struct membuf *to,
605 unsigned int live_sz)
606{
607 int i, j;
608 unsigned long long fill = ~0ull;
609 unsigned int cp_sz, pad_sz;
610
611 cp_sz = min(regset->size, live_sz);
612 pad_sz = regset->size - cp_sz;
613 WARN_ON(pad_sz % sizeof(fill));
614
615 for (i = 0; i < NUM_FPU_REGS; i++) {
616 membuf_write(to, &target->thread.fpu.fpr[i], cp_sz);
617 for (j = 0; j < (pad_sz / sizeof(fill)); j++)
618 membuf_store(to, fill);
619 }
620}
621
622static int msa_get(struct task_struct *target,
623 const struct user_regset *regset,
624 struct membuf to)
625{
626 const unsigned int wr_size = NUM_FPU_REGS * regset->size;
627 const struct msa_control_regs ctrl_regs = {
628 .fir = boot_cpu_data.fpu_id,
629 .fcsr = target->thread.fpu.fcr31,
630 .msair = boot_cpu_data.msa_id,
631 .msacsr = target->thread.fpu.msacsr,
632 };
633
634 if (!tsk_used_math(target)) {
635 /* The task hasn't used FP or MSA, fill with 0xff */
636 copy_pad_fprs(target, regset, &to, 0);
637 } else if (!test_tsk_thread_flag(target, TIF_MSA_CTX_LIVE)) {
638 /* Copy scalar FP context, fill the rest with 0xff */
639 copy_pad_fprs(target, regset, &to, 8);
640 } else if (sizeof(target->thread.fpu.fpr[0]) == regset->size) {
641 /* Trivially copy the vector registers */
642 membuf_write(&to, &target->thread.fpu.fpr, wr_size);
643 } else {
644 /* Copy as much context as possible, fill the rest with 0xff */
645 copy_pad_fprs(target, regset, &to,
646 sizeof(target->thread.fpu.fpr[0]));
647 }
648
649 return membuf_write(&to, &ctrl_regs, sizeof(ctrl_regs));
650}
651
652static int msa_set(struct task_struct *target,
653 const struct user_regset *regset,
654 unsigned int pos, unsigned int count,
655 const void *kbuf, const void __user *ubuf)
656{
657 const unsigned int wr_size = NUM_FPU_REGS * regset->size;
658 struct msa_control_regs ctrl_regs;
659 unsigned int cp_sz;
660 int i, err, start;
661
662 init_fp_ctx(target);
663
664 if (sizeof(target->thread.fpu.fpr[0]) == regset->size) {
665 /* Trivially copy the vector registers */
666 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
667 &target->thread.fpu.fpr,
668 0, wr_size);
669 } else {
670 /* Copy as much context as possible */
671 cp_sz = min_t(unsigned int, regset->size,
672 sizeof(target->thread.fpu.fpr[0]));
673
674 i = start = err = 0;
675 for (; i < NUM_FPU_REGS; i++, start += regset->size) {
676 err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
677 &target->thread.fpu.fpr[i],
678 start, start + cp_sz);
679 }
680 }
681
682 if (!err)
683 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl_regs,
684 wr_size, wr_size + sizeof(ctrl_regs));
685 if (!err) {
686 target->thread.fpu.fcr31 = ctrl_regs.fcsr & ~FPU_CSR_ALL_X;
687 target->thread.fpu.msacsr = ctrl_regs.msacsr & ~MSA_CSR_CAUSEF;
688 }
689
690 return err;
691}
692
693#endif /* CONFIG_CPU_HAS_MSA */
694
695#if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
696
697/*
698 * Copy the DSP context to the supplied 32-bit NT_MIPS_DSP buffer.
699 */
700static int dsp32_get(struct task_struct *target,
701 const struct user_regset *regset,
702 struct membuf to)
703{
704 u32 dspregs[NUM_DSP_REGS + 1];
705 unsigned int i;
706
707 BUG_ON(to.left % sizeof(u32));
708
709 if (!cpu_has_dsp)
710 return -EIO;
711
712 for (i = 0; i < NUM_DSP_REGS; i++)
713 dspregs[i] = target->thread.dsp.dspr[i];
714 dspregs[NUM_DSP_REGS] = target->thread.dsp.dspcontrol;
715 return membuf_write(&to, dspregs, sizeof(dspregs));
716}
717
718/*
719 * Copy the supplied 32-bit NT_MIPS_DSP buffer to the DSP context.
720 */
721static int dsp32_set(struct task_struct *target,
722 const struct user_regset *regset,
723 unsigned int pos, unsigned int count,
724 const void *kbuf, const void __user *ubuf)
725{
726 unsigned int start, num_regs, i;
727 u32 dspregs[NUM_DSP_REGS + 1];
728 int err;
729
730 BUG_ON(count % sizeof(u32));
731
732 if (!cpu_has_dsp)
733 return -EIO;
734
735 start = pos / sizeof(u32);
736 num_regs = count / sizeof(u32);
737
738 if (start + num_regs > NUM_DSP_REGS + 1)
739 return -EIO;
740
741 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, dspregs, 0,
742 sizeof(dspregs));
743 if (err)
744 return err;
745
746 for (i = start; i < num_regs; i++)
747 switch (i) {
748 case 0 ... NUM_DSP_REGS - 1:
749 target->thread.dsp.dspr[i] = (s32)dspregs[i];
750 break;
751 case NUM_DSP_REGS:
752 target->thread.dsp.dspcontrol = (s32)dspregs[i];
753 break;
754 }
755
756 return 0;
757}
758
759#endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
760
761#ifdef CONFIG_64BIT
762
763/*
764 * Copy the DSP context to the supplied 64-bit NT_MIPS_DSP buffer.
765 */
766static int dsp64_get(struct task_struct *target,
767 const struct user_regset *regset,
768 struct membuf to)
769{
770 u64 dspregs[NUM_DSP_REGS + 1];
771 unsigned int i;
772
773 BUG_ON(to.left % sizeof(u64));
774
775 if (!cpu_has_dsp)
776 return -EIO;
777
778 for (i = 0; i < NUM_DSP_REGS; i++)
779 dspregs[i] = target->thread.dsp.dspr[i];
780 dspregs[NUM_DSP_REGS] = target->thread.dsp.dspcontrol;
781 return membuf_write(s: &to, v: dspregs, size: sizeof(dspregs));
782}
783
784/*
785 * Copy the supplied 64-bit NT_MIPS_DSP buffer to the DSP context.
786 */
787static int dsp64_set(struct task_struct *target,
788 const struct user_regset *regset,
789 unsigned int pos, unsigned int count,
790 const void *kbuf, const void __user *ubuf)
791{
792 unsigned int start, num_regs, i;
793 u64 dspregs[NUM_DSP_REGS + 1];
794 int err;
795
796 BUG_ON(count % sizeof(u64));
797
798 if (!cpu_has_dsp)
799 return -EIO;
800
801 start = pos / sizeof(u64);
802 num_regs = count / sizeof(u64);
803
804 if (start + num_regs > NUM_DSP_REGS + 1)
805 return -EIO;
806
807 err = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, data: dspregs, start_pos: 0,
808 end_pos: sizeof(dspregs));
809 if (err)
810 return err;
811
812 for (i = start; i < num_regs; i++)
813 switch (i) {
814 case 0 ... NUM_DSP_REGS - 1:
815 target->thread.dsp.dspr[i] = dspregs[i];
816 break;
817 case NUM_DSP_REGS:
818 target->thread.dsp.dspcontrol = dspregs[i];
819 break;
820 }
821
822 return 0;
823}
824
825#endif /* CONFIG_64BIT */
826
827/*
828 * Determine whether the DSP context is present.
829 */
830static int dsp_active(struct task_struct *target,
831 const struct user_regset *regset)
832{
833 return cpu_has_dsp ? NUM_DSP_REGS + 1 : -ENODEV;
834}
835
836enum mips_regset {
837 REGSET_GPR,
838 REGSET_DSP,
839#ifdef CONFIG_MIPS_FP_SUPPORT
840 REGSET_FPR,
841 REGSET_FP_MODE,
842#endif
843#ifdef CONFIG_CPU_HAS_MSA
844 REGSET_MSA,
845#endif
846};
847
848struct pt_regs_offset {
849 const char *name;
850 int offset;
851};
852
853#define REG_OFFSET_NAME(reg, r) { \
854 .name = #reg, \
855 .offset = offsetof(struct pt_regs, r) \
856}
857
858#define REG_OFFSET_END { \
859 .name = NULL, \
860 .offset = 0 \
861}
862
863static const struct pt_regs_offset regoffset_table[] = {
864 REG_OFFSET_NAME(r0, regs[0]),
865 REG_OFFSET_NAME(r1, regs[1]),
866 REG_OFFSET_NAME(r2, regs[2]),
867 REG_OFFSET_NAME(r3, regs[3]),
868 REG_OFFSET_NAME(r4, regs[4]),
869 REG_OFFSET_NAME(r5, regs[5]),
870 REG_OFFSET_NAME(r6, regs[6]),
871 REG_OFFSET_NAME(r7, regs[7]),
872 REG_OFFSET_NAME(r8, regs[8]),
873 REG_OFFSET_NAME(r9, regs[9]),
874 REG_OFFSET_NAME(r10, regs[10]),
875 REG_OFFSET_NAME(r11, regs[11]),
876 REG_OFFSET_NAME(r12, regs[12]),
877 REG_OFFSET_NAME(r13, regs[13]),
878 REG_OFFSET_NAME(r14, regs[14]),
879 REG_OFFSET_NAME(r15, regs[15]),
880 REG_OFFSET_NAME(r16, regs[16]),
881 REG_OFFSET_NAME(r17, regs[17]),
882 REG_OFFSET_NAME(r18, regs[18]),
883 REG_OFFSET_NAME(r19, regs[19]),
884 REG_OFFSET_NAME(r20, regs[20]),
885 REG_OFFSET_NAME(r21, regs[21]),
886 REG_OFFSET_NAME(r22, regs[22]),
887 REG_OFFSET_NAME(r23, regs[23]),
888 REG_OFFSET_NAME(r24, regs[24]),
889 REG_OFFSET_NAME(r25, regs[25]),
890 REG_OFFSET_NAME(r26, regs[26]),
891 REG_OFFSET_NAME(r27, regs[27]),
892 REG_OFFSET_NAME(r28, regs[28]),
893 REG_OFFSET_NAME(r29, regs[29]),
894 REG_OFFSET_NAME(r30, regs[30]),
895 REG_OFFSET_NAME(r31, regs[31]),
896 REG_OFFSET_NAME(c0_status, cp0_status),
897 REG_OFFSET_NAME(hi, hi),
898 REG_OFFSET_NAME(lo, lo),
899#ifdef CONFIG_CPU_HAS_SMARTMIPS
900 REG_OFFSET_NAME(acx, acx),
901#endif
902 REG_OFFSET_NAME(c0_badvaddr, cp0_badvaddr),
903 REG_OFFSET_NAME(c0_cause, cp0_cause),
904 REG_OFFSET_NAME(c0_epc, cp0_epc),
905#ifdef CONFIG_CPU_CAVIUM_OCTEON
906 REG_OFFSET_NAME(mpl0, mpl[0]),
907 REG_OFFSET_NAME(mpl1, mpl[1]),
908 REG_OFFSET_NAME(mpl2, mpl[2]),
909 REG_OFFSET_NAME(mtp0, mtp[0]),
910 REG_OFFSET_NAME(mtp1, mtp[1]),
911 REG_OFFSET_NAME(mtp2, mtp[2]),
912#endif
913 REG_OFFSET_END,
914};
915
916/**
917 * regs_query_register_offset() - query register offset from its name
918 * @name: the name of a register
919 *
920 * regs_query_register_offset() returns the offset of a register in struct
921 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
922 */
923int regs_query_register_offset(const char *name)
924{
925 const struct pt_regs_offset *roff;
926
927 for (roff = regoffset_table; roff->name != NULL; roff++)
928 if (!strcmp(roff->name, name))
929 return roff->offset;
930
931 return -EINVAL;
932}
933
934#if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
935
936static const struct user_regset mips_regsets[] = {
937 [REGSET_GPR] = {
938 USER_REGSET_NOTE_TYPE(PRSTATUS),
939 .n = ELF_NGREG,
940 .size = sizeof(unsigned int),
941 .align = sizeof(unsigned int),
942 .regset_get = gpr32_get,
943 .set = gpr32_set,
944 },
945 [REGSET_DSP] = {
946 USER_REGSET_NOTE_TYPE(MIPS_DSP),
947 .n = NUM_DSP_REGS + 1,
948 .size = sizeof(u32),
949 .align = sizeof(u32),
950 .regset_get = dsp32_get,
951 .set = dsp32_set,
952 .active = dsp_active,
953 },
954#ifdef CONFIG_MIPS_FP_SUPPORT
955 [REGSET_FPR] = {
956 USER_REGSET_NOTE_TYPE(PRFPREG),
957 .n = ELF_NFPREG,
958 .size = sizeof(elf_fpreg_t),
959 .align = sizeof(elf_fpreg_t),
960 .regset_get = fpr_get,
961 .set = fpr_set,
962 },
963 [REGSET_FP_MODE] = {
964 USER_REGSET_NOTE_TYPE(MIPS_FP_MODE),
965 .n = 1,
966 .size = sizeof(int),
967 .align = sizeof(int),
968 .regset_get = fp_mode_get,
969 .set = fp_mode_set,
970 },
971#endif
972#ifdef CONFIG_CPU_HAS_MSA
973 [REGSET_MSA] = {
974 USER_REGSET_NOTE_TYPE(MIPS_MSA),
975 .n = NUM_FPU_REGS + 1,
976 .size = 16,
977 .align = 16,
978 .regset_get = msa_get,
979 .set = msa_set,
980 },
981#endif
982};
983
984static const struct user_regset_view user_mips_view = {
985 .name = "mips",
986 .e_machine = ELF_ARCH,
987 .ei_osabi = ELF_OSABI,
988 .regsets = mips_regsets,
989 .n = ARRAY_SIZE(mips_regsets),
990};
991
992#endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
993
994#ifdef CONFIG_64BIT
995
996static const struct user_regset mips64_regsets[] = {
997 [REGSET_GPR] = {
998 USER_REGSET_NOTE_TYPE(PRSTATUS),
999 .n = ELF_NGREG,
1000 .size = sizeof(unsigned long),
1001 .align = sizeof(unsigned long),
1002 .regset_get = gpr64_get,
1003 .set = gpr64_set,
1004 },
1005 [REGSET_DSP] = {
1006 USER_REGSET_NOTE_TYPE(MIPS_DSP),
1007 .n = NUM_DSP_REGS + 1,
1008 .size = sizeof(u64),
1009 .align = sizeof(u64),
1010 .regset_get = dsp64_get,
1011 .set = dsp64_set,
1012 .active = dsp_active,
1013 },
1014#ifdef CONFIG_MIPS_FP_SUPPORT
1015 [REGSET_FP_MODE] = {
1016 USER_REGSET_NOTE_TYPE(MIPS_FP_MODE),
1017 .n = 1,
1018 .size = sizeof(int),
1019 .align = sizeof(int),
1020 .regset_get = fp_mode_get,
1021 .set = fp_mode_set,
1022 },
1023 [REGSET_FPR] = {
1024 USER_REGSET_NOTE_TYPE(PRFPREG),
1025 .n = ELF_NFPREG,
1026 .size = sizeof(elf_fpreg_t),
1027 .align = sizeof(elf_fpreg_t),
1028 .regset_get = fpr_get,
1029 .set = fpr_set,
1030 },
1031#endif
1032#ifdef CONFIG_CPU_HAS_MSA
1033 [REGSET_MSA] = {
1034 USER_REGSET_NOTE_TYPE(MIPS_MSA),
1035 .n = NUM_FPU_REGS + 1,
1036 .size = 16,
1037 .align = 16,
1038 .regset_get = msa_get,
1039 .set = msa_set,
1040 },
1041#endif
1042};
1043
1044static const struct user_regset_view user_mips64_view = {
1045 .name = "mips64",
1046 .e_machine = ELF_ARCH,
1047 .ei_osabi = ELF_OSABI,
1048 .regsets = mips64_regsets,
1049 .n = ARRAY_SIZE(mips64_regsets),
1050};
1051
1052#ifdef CONFIG_MIPS32_N32
1053
1054static const struct user_regset_view user_mipsn32_view = {
1055 .name = "mipsn32",
1056 .e_flags = EF_MIPS_ABI2,
1057 .e_machine = ELF_ARCH,
1058 .ei_osabi = ELF_OSABI,
1059 .regsets = mips64_regsets,
1060 .n = ARRAY_SIZE(mips64_regsets),
1061};
1062
1063#endif /* CONFIG_MIPS32_N32 */
1064
1065#endif /* CONFIG_64BIT */
1066
1067const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1068{
1069#ifdef CONFIG_32BIT
1070 return &user_mips_view;
1071#else
1072#ifdef CONFIG_MIPS32_O32
1073 if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
1074 return &user_mips_view;
1075#endif
1076#ifdef CONFIG_MIPS32_N32
1077 if (test_tsk_thread_flag(task, TIF_32BIT_ADDR))
1078 return &user_mipsn32_view;
1079#endif
1080 return &user_mips64_view;
1081#endif
1082}
1083
1084long arch_ptrace(struct task_struct *child, long request,
1085 unsigned long addr, unsigned long data)
1086{
1087 int ret;
1088 void __user *addrp = (void __user *) addr;
1089 void __user *datavp = (void __user *) data;
1090 unsigned long __user *datalp = (void __user *) data;
1091
1092 switch (request) {
1093 /* when I and D space are separate, these will need to be fixed. */
1094 case PTRACE_PEEKTEXT: /* read word at location addr. */
1095 case PTRACE_PEEKDATA:
1096 ret = generic_ptrace_peekdata(tsk: child, addr, data);
1097 break;
1098
1099 /* Read the word at location addr in the USER area. */
1100 case PTRACE_PEEKUSR: {
1101 struct pt_regs *regs;
1102 unsigned long tmp = 0;
1103
1104 regs = task_pt_regs(child);
1105 ret = 0; /* Default return value. */
1106
1107 switch (addr) {
1108 case 0 ... 31:
1109 tmp = regs->regs[addr];
1110 break;
1111#ifdef CONFIG_MIPS_FP_SUPPORT
1112 case FPR_BASE ... FPR_BASE + 31: {
1113 union fpureg *fregs;
1114
1115 if (!tsk_used_math(child)) {
1116 /* FP not yet used */
1117 tmp = -1;
1118 break;
1119 }
1120 fregs = get_fpu_regs(child);
1121
1122#ifdef CONFIG_32BIT
1123 if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
1124 /*
1125 * The odd registers are actually the high
1126 * order bits of the values stored in the even
1127 * registers.
1128 */
1129 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
1130 addr & 1);
1131 break;
1132 }
1133#endif
1134 tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
1135 break;
1136 }
1137 case FPC_CSR:
1138 tmp = child->thread.fpu.fcr31;
1139 break;
1140 case FPC_EIR:
1141 /* implementation / version register */
1142 tmp = boot_cpu_data.fpu_id;
1143 break;
1144#endif
1145 case PC:
1146 tmp = regs->cp0_epc;
1147 break;
1148 case CAUSE:
1149 tmp = regs->cp0_cause;
1150 break;
1151 case BADVADDR:
1152 tmp = regs->cp0_badvaddr;
1153 break;
1154 case MMHI:
1155 tmp = regs->hi;
1156 break;
1157 case MMLO:
1158 tmp = regs->lo;
1159 break;
1160#ifdef CONFIG_CPU_HAS_SMARTMIPS
1161 case ACX:
1162 tmp = regs->acx;
1163 break;
1164#endif
1165 case DSP_BASE ... DSP_BASE + 5: {
1166 dspreg_t *dregs;
1167
1168 if (!cpu_has_dsp) {
1169 tmp = 0;
1170 ret = -EIO;
1171 goto out;
1172 }
1173 dregs = __get_dsp_regs(child);
1174 tmp = dregs[addr - DSP_BASE];
1175 break;
1176 }
1177 case DSP_CONTROL:
1178 if (!cpu_has_dsp) {
1179 tmp = 0;
1180 ret = -EIO;
1181 goto out;
1182 }
1183 tmp = child->thread.dsp.dspcontrol;
1184 break;
1185 default:
1186 tmp = 0;
1187 ret = -EIO;
1188 goto out;
1189 }
1190 ret = put_user(tmp, datalp);
1191 break;
1192 }
1193
1194 /* when I and D space are separate, this will have to be fixed. */
1195 case PTRACE_POKETEXT: /* write the word at location addr. */
1196 case PTRACE_POKEDATA:
1197 ret = generic_ptrace_pokedata(tsk: child, addr, data);
1198 break;
1199
1200 case PTRACE_POKEUSR: {
1201 struct pt_regs *regs;
1202 ret = 0;
1203 regs = task_pt_regs(child);
1204
1205 switch (addr) {
1206 case 0 ... 31:
1207 regs->regs[addr] = data;
1208 /* System call number may have been changed */
1209 if (addr == 2)
1210 mips_syscall_update_nr(child, regs);
1211 else if (addr == 4 &&
1212 mips_syscall_is_indirect(child, regs))
1213 mips_syscall_update_nr(child, regs);
1214 break;
1215#ifdef CONFIG_MIPS_FP_SUPPORT
1216 case FPR_BASE ... FPR_BASE + 31: {
1217 union fpureg *fregs = get_fpu_regs(child);
1218
1219 init_fp_ctx(child);
1220#ifdef CONFIG_32BIT
1221 if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
1222 /*
1223 * The odd registers are actually the high
1224 * order bits of the values stored in the even
1225 * registers.
1226 */
1227 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
1228 addr & 1, data);
1229 break;
1230 }
1231#endif
1232 set_fpr64(&fregs[addr - FPR_BASE], 0, data);
1233 break;
1234 }
1235 case FPC_CSR:
1236 init_fp_ctx(child);
1237 ptrace_setfcr31(child, data);
1238 break;
1239#endif
1240 case PC:
1241 regs->cp0_epc = data;
1242 break;
1243 case MMHI:
1244 regs->hi = data;
1245 break;
1246 case MMLO:
1247 regs->lo = data;
1248 break;
1249#ifdef CONFIG_CPU_HAS_SMARTMIPS
1250 case ACX:
1251 regs->acx = data;
1252 break;
1253#endif
1254 case DSP_BASE ... DSP_BASE + 5: {
1255 dspreg_t *dregs;
1256
1257 if (!cpu_has_dsp) {
1258 ret = -EIO;
1259 break;
1260 }
1261
1262 dregs = __get_dsp_regs(child);
1263 dregs[addr - DSP_BASE] = data;
1264 break;
1265 }
1266 case DSP_CONTROL:
1267 if (!cpu_has_dsp) {
1268 ret = -EIO;
1269 break;
1270 }
1271 child->thread.dsp.dspcontrol = data;
1272 break;
1273 default:
1274 /* The rest are not allowed. */
1275 ret = -EIO;
1276 break;
1277 }
1278 break;
1279 }
1280
1281 case PTRACE_GETREGS:
1282 ret = ptrace_getregs(child, data: datavp);
1283 break;
1284
1285 case PTRACE_SETREGS:
1286 ret = ptrace_setregs(child, data: datavp);
1287 break;
1288
1289#ifdef CONFIG_MIPS_FP_SUPPORT
1290 case PTRACE_GETFPREGS:
1291 ret = ptrace_getfpregs(child, datavp);
1292 break;
1293
1294 case PTRACE_SETFPREGS:
1295 ret = ptrace_setfpregs(child, datavp);
1296 break;
1297#endif
1298 case PTRACE_GET_THREAD_AREA:
1299 ret = put_user(task_thread_info(child)->tp_value, datalp);
1300 break;
1301
1302 case PTRACE_GET_WATCH_REGS:
1303 ret = ptrace_get_watch_regs(child, addr: addrp);
1304 break;
1305
1306 case PTRACE_SET_WATCH_REGS:
1307 ret = ptrace_set_watch_regs(child, addr: addrp);
1308 break;
1309
1310 default:
1311 ret = ptrace_request(child, request, addr, data);
1312 break;
1313 }
1314 out:
1315 return ret;
1316}
1317
1318/*
1319 * Notification of system call entry/exit
1320 * - triggered by current->work.syscall_trace
1321 */
1322asmlinkage long syscall_trace_enter(struct pt_regs *regs)
1323{
1324 user_exit();
1325
1326 if (test_thread_flag(TIF_SYSCALL_TRACE)) {
1327 if (ptrace_report_syscall_entry(regs))
1328 return -1;
1329 }
1330
1331 if (secure_computing())
1332 return -1;
1333
1334 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1335 trace_sys_enter(regs, id: regs->regs[2]);
1336
1337 audit_syscall_entry(current_thread_info()->syscall,
1338 a0: regs->regs[4], a1: regs->regs[5],
1339 a2: regs->regs[6], a3: regs->regs[7]);
1340
1341 /*
1342 * Negative syscall numbers are mistaken for rejected syscalls, but
1343 * won't have had the return value set appropriately, so we do so now.
1344 */
1345 if (current_thread_info()->syscall < 0)
1346 syscall_set_return_value(current, regs, error: -ENOSYS, val: 0);
1347 return current_thread_info()->syscall;
1348}
1349
1350/*
1351 * Notification of system call entry/exit
1352 * - triggered by current->work.syscall_trace
1353 */
1354asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1355{
1356 /*
1357 * We may come here right after calling schedule_user()
1358 * or do_notify_resume(), in which case we can be in RCU
1359 * user mode.
1360 */
1361 user_exit();
1362
1363 audit_syscall_exit(pt_regs: regs);
1364
1365 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1366 trace_sys_exit(regs, ret: regs_return_value(regs));
1367
1368 if (test_thread_flag(TIF_SYSCALL_TRACE))
1369 ptrace_report_syscall_exit(regs, step: 0);
1370
1371 user_enter();
1372}
1373

source code of linux/arch/mips/kernel/ptrace.c