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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / arch / mips / kernel / ptrace.c
blob414b6e9c900b2c9e455389b9f557d69c16e9c4b2
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/tracehook.h>
31 #include <linux/audit.h>
32 #include <linux/seccomp.h>
33 #include <linux/ftrace.h>
34
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/pgtable.h>
43 #include <asm/page.h>
44 #include <asm/processor.h>
45 #include <asm/syscall.h>
46 #include <linux/uaccess.h>
47 #include <asm/bootinfo.h>
48 #include <asm/reg.h>
49
50 #define CREATE_TRACE_POINTS
51 #include <trace/events/syscalls.h>
52
53 /*
54 * Called by kernel/ptrace.c when detaching..
55 *
56 * Make sure single step bits etc are not set.
57 */
58 void ptrace_disable(struct task_struct *child)
59 {
60 /* Don't load the watchpoint registers for the ex-child. */
61 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
62 }
63
64 /*
65 * Read a general register set. We always use the 64-bit format, even
66 * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
67 * Registers are sign extended to fill the available space.
68 */
69 int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data)
70 {
71 struct pt_regs *regs;
72 int i;
73
74 if (!access_ok(data, 38 * 8))
75 return -EIO;
76
77 regs = task_pt_regs(child);
78
79 for (i = 0; i < 32; i++)
80 __put_user((long)regs->regs[i], (__s64 __user *)&data->regs[i]);
81 __put_user((long)regs->lo, (__s64 __user *)&data->lo);
82 __put_user((long)regs->hi, (__s64 __user *)&data->hi);
83 __put_user((long)regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
84 __put_user((long)regs->cp0_badvaddr, (__s64 __user *)&data->cp0_badvaddr);
85 __put_user((long)regs->cp0_status, (__s64 __user *)&data->cp0_status);
86 __put_user((long)regs->cp0_cause, (__s64 __user *)&data->cp0_cause);
87
88 return 0;
89 }
90
91 /*
92 * Write a general register set. As for PTRACE_GETREGS, we always use
93 * the 64-bit format. On a 32-bit kernel only the lower order half
94 * (according to endianness) will be used.
95 */
96 int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data)
97 {
98 struct pt_regs *regs;
99 int i;
100
101 if (!access_ok(data, 38 * 8))
102 return -EIO;
103
104 regs = task_pt_regs(child);
105
106 for (i = 0; i < 32; i++)
107 __get_user(regs->regs[i], (__s64 __user *)&data->regs[i]);
108 __get_user(regs->lo, (__s64 __user *)&data->lo);
109 __get_user(regs->hi, (__s64 __user *)&data->hi);
110 __get_user(regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
111
112 /* badvaddr, status, and cause may not be written. */
113
114 /* System call number may have been changed */
115 mips_syscall_update_nr(child, regs);
116
117 return 0;
118 }
119
120 int ptrace_get_watch_regs(struct task_struct *child,
121 struct pt_watch_regs __user *addr)
122 {
123 enum pt_watch_style style;
124 int i;
125
126 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
127 return -EIO;
128 if (!access_ok(addr, sizeof(struct pt_watch_regs)))
129 return -EIO;
130
131 #ifdef CONFIG_32BIT
132 style = pt_watch_style_mips32;
133 #define WATCH_STYLE mips32
134 #else
135 style = pt_watch_style_mips64;
136 #define WATCH_STYLE mips64
137 #endif
138
139 __put_user(style, &addr->style);
140 __put_user(boot_cpu_data.watch_reg_use_cnt,
141 &addr->WATCH_STYLE.num_valid);
142 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
143 __put_user(child->thread.watch.mips3264.watchlo[i],
144 &addr->WATCH_STYLE.watchlo[i]);
145 __put_user(child->thread.watch.mips3264.watchhi[i] &
146 (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW),
147 &addr->WATCH_STYLE.watchhi[i]);
148 __put_user(boot_cpu_data.watch_reg_masks[i],
149 &addr->WATCH_STYLE.watch_masks[i]);
150 }
151 for (; i < 8; i++) {
152 __put_user(0, &addr->WATCH_STYLE.watchlo[i]);
153 __put_user(0, &addr->WATCH_STYLE.watchhi[i]);
154 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]);
155 }
156
157 return 0;
158 }
159
160 int ptrace_set_watch_regs(struct task_struct *child,
161 struct pt_watch_regs __user *addr)
162 {
163 int i;
164 int watch_active = 0;
165 unsigned long lt[NUM_WATCH_REGS];
166 u16 ht[NUM_WATCH_REGS];
167
168 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
169 return -EIO;
170 if (!access_ok(addr, sizeof(struct pt_watch_regs)))
171 return -EIO;
172 /* Check the values. */
173 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
174 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]);
175 #ifdef CONFIG_32BIT
176 if (lt[i] & __UA_LIMIT)
177 return -EINVAL;
178 #else
179 if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) {
180 if (lt[i] & 0xffffffff80000000UL)
181 return -EINVAL;
182 } else {
183 if (lt[i] & __UA_LIMIT)
184 return -EINVAL;
185 }
186 #endif
187 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
188 if (ht[i] & ~MIPS_WATCHHI_MASK)
189 return -EINVAL;
190 }
191 /* Install them. */
192 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
193 if (lt[i] & MIPS_WATCHLO_IRW)
194 watch_active = 1;
195 child->thread.watch.mips3264.watchlo[i] = lt[i];
196 /* Set the G bit. */
197 child->thread.watch.mips3264.watchhi[i] = ht[i];
198 }
199
200 if (watch_active)
201 set_tsk_thread_flag(child, TIF_LOAD_WATCH);
202 else
203 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
204
205 return 0;
206 }
207
208 /* regset get/set implementations */
209
210 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
211
212 static int gpr32_get(struct task_struct *target,
213 const struct user_regset *regset,
214 unsigned int pos, unsigned int count,
215 void *kbuf, void __user *ubuf)
216 {
217 struct pt_regs *regs = task_pt_regs(target);
218 u32 uregs[ELF_NGREG] = {};
219
220 mips_dump_regs32(uregs, regs);
221 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
222 sizeof(uregs));
223 }
224
225 static int gpr32_set(struct task_struct *target,
226 const struct user_regset *regset,
227 unsigned int pos, unsigned int count,
228 const void *kbuf, const void __user *ubuf)
229 {
230 struct pt_regs *regs = task_pt_regs(target);
231 u32 uregs[ELF_NGREG];
232 unsigned start, num_regs, i;
233 int err;
234
235 start = pos / sizeof(u32);
236 num_regs = count / sizeof(u32);
237
238 if (start + num_regs > ELF_NGREG)
239 return -EIO;
240
241 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
242 sizeof(uregs));
243 if (err)
244 return err;
245
246 for (i = start; i < num_regs; i++) {
247 /*
248 * Cast all values to signed here so that if this is a 64-bit
249 * kernel, the supplied 32-bit values will be sign extended.
250 */
251 switch (i) {
252 case MIPS32_EF_R1 ... MIPS32_EF_R25:
253 /* k0/k1 are ignored. */
254 case MIPS32_EF_R28 ... MIPS32_EF_R31:
255 regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i];
256 break;
257 case MIPS32_EF_LO:
258 regs->lo = (s32)uregs[i];
259 break;
260 case MIPS32_EF_HI:
261 regs->hi = (s32)uregs[i];
262 break;
263 case MIPS32_EF_CP0_EPC:
264 regs->cp0_epc = (s32)uregs[i];
265 break;
266 }
267 }
268
269 /* System call number may have been changed */
270 mips_syscall_update_nr(target, regs);
271
272 return 0;
273 }
274
275 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
276
277 #ifdef CONFIG_64BIT
278
279 static int gpr64_get(struct task_struct *target,
280 const struct user_regset *regset,
281 unsigned int pos, unsigned int count,
282 void *kbuf, void __user *ubuf)
283 {
284 struct pt_regs *regs = task_pt_regs(target);
285 u64 uregs[ELF_NGREG] = {};
286
287 mips_dump_regs64(uregs, regs);
288 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
289 sizeof(uregs));
290 }
291
292 static int gpr64_set(struct task_struct *target,
293 const struct user_regset *regset,
294 unsigned int pos, unsigned int count,
295 const void *kbuf, const void __user *ubuf)
296 {
297 struct pt_regs *regs = task_pt_regs(target);
298 u64 uregs[ELF_NGREG];
299 unsigned start, num_regs, i;
300 int err;
301
302 start = pos / sizeof(u64);
303 num_regs = count / sizeof(u64);
304
305 if (start + num_regs > ELF_NGREG)
306 return -EIO;
307
308 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
309 sizeof(uregs));
310 if (err)
311 return err;
312
313 for (i = start; i < num_regs; i++) {
314 switch (i) {
315 case MIPS64_EF_R1 ... MIPS64_EF_R25:
316 /* k0/k1 are ignored. */
317 case MIPS64_EF_R28 ... MIPS64_EF_R31:
318 regs->regs[i - MIPS64_EF_R0] = uregs[i];
319 break;
320 case MIPS64_EF_LO:
321 regs->lo = uregs[i];
322 break;
323 case MIPS64_EF_HI:
324 regs->hi = uregs[i];
325 break;
326 case MIPS64_EF_CP0_EPC:
327 regs->cp0_epc = uregs[i];
328 break;
329 }
330 }
331
332 /* System call number may have been changed */
333 mips_syscall_update_nr(target, regs);
334
335 return 0;
336 }
337
338 #endif /* CONFIG_64BIT */
339
340
341 #ifdef CONFIG_MIPS_FP_SUPPORT
342
343 /*
344 * Poke at FCSR according to its mask. Set the Cause bits even
345 * if a corresponding Enable bit is set. This will be noticed at
346 * the time the thread is switched to and SIGFPE thrown accordingly.
347 */
348 static void ptrace_setfcr31(struct task_struct *child, u32 value)
349 {
350 u32 fcr31;
351 u32 mask;
352
353 fcr31 = child->thread.fpu.fcr31;
354 mask = boot_cpu_data.fpu_msk31;
355 child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask);
356 }
357
358 int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
359 {
360 int i;
361
362 if (!access_ok(data, 33 * 8))
363 return -EIO;
364
365 if (tsk_used_math(child)) {
366 union fpureg *fregs = get_fpu_regs(child);
367 for (i = 0; i < 32; i++)
368 __put_user(get_fpr64(&fregs[i], 0),
369 i + (__u64 __user *)data);
370 } else {
371 for (i = 0; i < 32; i++)
372 __put_user((__u64) -1, i + (__u64 __user *) data);
373 }
374
375 __put_user(child->thread.fpu.fcr31, data + 64);
376 __put_user(boot_cpu_data.fpu_id, data + 65);
377
378 return 0;
379 }
380
381 int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
382 {
383 union fpureg *fregs;
384 u64 fpr_val;
385 u32 value;
386 int i;
387
388 if (!access_ok(data, 33 * 8))
389 return -EIO;
390
391 init_fp_ctx(child);
392 fregs = get_fpu_regs(child);
393
394 for (i = 0; i < 32; i++) {
395 __get_user(fpr_val, i + (__u64 __user *)data);
396 set_fpr64(&fregs[i], 0, fpr_val);
397 }
398
399 __get_user(value, data + 64);
400 ptrace_setfcr31(child, value);
401
402 /* FIR may not be written. */
403
404 return 0;
405 }
406
407 /*
408 * Copy the floating-point context to the supplied NT_PRFPREG buffer,
409 * !CONFIG_CPU_HAS_MSA variant. FP context's general register slots
410 * correspond 1:1 to buffer slots. Only general registers are copied.
411 */
412 static int fpr_get_fpa(struct task_struct *target,
413 unsigned int *pos, unsigned int *count,
414 void **kbuf, void __user **ubuf)
415 {
416 return user_regset_copyout(pos, count, kbuf, ubuf,
417 &target->thread.fpu,
418 0, NUM_FPU_REGS * sizeof(elf_fpreg_t));
419 }
420
421 /*
422 * Copy the floating-point context to the supplied NT_PRFPREG buffer,
423 * CONFIG_CPU_HAS_MSA variant. Only lower 64 bits of FP context's
424 * general register slots are copied to buffer slots. Only general
425 * registers are copied.
426 */
427 static int fpr_get_msa(struct task_struct *target,
428 unsigned int *pos, unsigned int *count,
429 void **kbuf, void __user **ubuf)
430 {
431 unsigned int i;
432 u64 fpr_val;
433 int err;
434
435 BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
436 for (i = 0; i < NUM_FPU_REGS; i++) {
437 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
438 err = user_regset_copyout(pos, count, kbuf, ubuf,
439 &fpr_val, i * sizeof(elf_fpreg_t),
440 (i + 1) * sizeof(elf_fpreg_t));
441 if (err)
442 return err;
443 }
444
445 return 0;
446 }
447
448 /*
449 * Copy the floating-point context to the supplied NT_PRFPREG buffer.
450 * Choose the appropriate helper for general registers, and then copy
451 * the FCSR and FIR registers separately.
452 */
453 static int fpr_get(struct task_struct *target,
454 const struct user_regset *regset,
455 unsigned int pos, unsigned int count,
456 void *kbuf, void __user *ubuf)
457 {
458 const int fcr31_pos = NUM_FPU_REGS * sizeof(elf_fpreg_t);
459 const int fir_pos = fcr31_pos + sizeof(u32);
460 int err;
461
462 if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
463 err = fpr_get_fpa(target, &pos, &count, &kbuf, &ubuf);
464 else
465 err = fpr_get_msa(target, &pos, &count, &kbuf, &ubuf);
466 if (err)
467 return err;
468
469 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
470 &target->thread.fpu.fcr31,
471 fcr31_pos, fcr31_pos + sizeof(u32));
472 if (err)
473 return err;
474
475 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
476 &boot_cpu_data.fpu_id,
477 fir_pos, fir_pos + sizeof(u32));
478
479 return err;
480 }
481
482 /*
483 * Copy the supplied NT_PRFPREG buffer to the floating-point context,
484 * !CONFIG_CPU_HAS_MSA variant. Buffer slots correspond 1:1 to FP
485 * context's general register slots. Only general registers are copied.
486 */
487 static int fpr_set_fpa(struct task_struct *target,
488 unsigned int *pos, unsigned int *count,
489 const void **kbuf, const void __user **ubuf)
490 {
491 return user_regset_copyin(pos, count, kbuf, ubuf,
492 &target->thread.fpu,
493 0, NUM_FPU_REGS * sizeof(elf_fpreg_t));
494 }
495
496 /*
497 * Copy the supplied NT_PRFPREG buffer to the floating-point context,
498 * CONFIG_CPU_HAS_MSA variant. Buffer slots are copied to lower 64
499 * bits only of FP context's general register slots. Only general
500 * registers are copied.
501 */
502 static int fpr_set_msa(struct task_struct *target,
503 unsigned int *pos, unsigned int *count,
504 const void **kbuf, const void __user **ubuf)
505 {
506 unsigned int i;
507 u64 fpr_val;
508 int err;
509
510 BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
511 for (i = 0; i < NUM_FPU_REGS && *count > 0; i++) {
512 err = user_regset_copyin(pos, count, kbuf, ubuf,
513 &fpr_val, i * sizeof(elf_fpreg_t),
514 (i + 1) * sizeof(elf_fpreg_t));
515 if (err)
516 return err;
517 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
518 }
519
520 return 0;
521 }
522
523 /*
524 * Copy the supplied NT_PRFPREG buffer to the floating-point context.
525 * Choose the appropriate helper for general registers, and then copy
526 * the FCSR register separately. Ignore the incoming FIR register
527 * contents though, as the register is read-only.
528 *
529 * We optimize for the case where `count % sizeof(elf_fpreg_t) == 0',
530 * which is supposed to have been guaranteed by the kernel before
531 * calling us, e.g. in `ptrace_regset'. We enforce that requirement,
532 * so that we can safely avoid preinitializing temporaries for
533 * partial register writes.
534 */
535 static int fpr_set(struct task_struct *target,
536 const struct user_regset *regset,
537 unsigned int pos, unsigned int count,
538 const void *kbuf, const void __user *ubuf)
539 {
540 const int fcr31_pos = NUM_FPU_REGS * sizeof(elf_fpreg_t);
541 const int fir_pos = fcr31_pos + sizeof(u32);
542 u32 fcr31;
543 int err;
544
545 BUG_ON(count % sizeof(elf_fpreg_t));
546
547 if (pos + count > sizeof(elf_fpregset_t))
548 return -EIO;
549
550 init_fp_ctx(target);
551
552 if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
553 err = fpr_set_fpa(target, &pos, &count, &kbuf, &ubuf);
554 else
555 err = fpr_set_msa(target, &pos, &count, &kbuf, &ubuf);
556 if (err)
557 return err;
558
559 if (count > 0) {
560 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
561 &fcr31,
562 fcr31_pos, fcr31_pos + sizeof(u32));
563 if (err)
564 return err;
565
566 ptrace_setfcr31(target, fcr31);
567 }
568
569 if (count > 0)
570 err = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
571 fir_pos,
572 fir_pos + sizeof(u32));
573
574 return err;
575 }
576
577 /* Copy the FP mode setting to the supplied NT_MIPS_FP_MODE buffer. */
578 static int fp_mode_get(struct task_struct *target,
579 const struct user_regset *regset,
580 unsigned int pos, unsigned int count,
581 void *kbuf, void __user *ubuf)
582 {
583 int fp_mode;
584
585 fp_mode = mips_get_process_fp_mode(target);
586 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &fp_mode, 0,
587 sizeof(fp_mode));
588 }
589
590 /*
591 * Copy the supplied NT_MIPS_FP_MODE buffer to the FP mode setting.
592 *
593 * We optimize for the case where `count % sizeof(int) == 0', which
594 * is supposed to have been guaranteed by the kernel before calling
595 * us, e.g. in `ptrace_regset'. We enforce that requirement, so
596 * that we can safely avoid preinitializing temporaries for partial
597 * mode writes.
598 */
599 static int fp_mode_set(struct task_struct *target,
600 const struct user_regset *regset,
601 unsigned int pos, unsigned int count,
602 const void *kbuf, const void __user *ubuf)
603 {
604 int fp_mode;
605 int err;
606
607 BUG_ON(count % sizeof(int));
608
609 if (pos + count > sizeof(fp_mode))
610 return -EIO;
611
612 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fp_mode, 0,
613 sizeof(fp_mode));
614 if (err)
615 return err;
616
617 if (count > 0)
618 err = mips_set_process_fp_mode(target, fp_mode);
619
620 return err;
621 }
622
623 #endif /* CONFIG_MIPS_FP_SUPPORT */
624
625 #ifdef CONFIG_CPU_HAS_MSA
626
627 struct msa_control_regs {
628 unsigned int fir;
629 unsigned int fcsr;
630 unsigned int msair;
631 unsigned int msacsr;
632 };
633
634 static int copy_pad_fprs(struct task_struct *target,
635 const struct user_regset *regset,
636 unsigned int *ppos, unsigned int *pcount,
637 void **pkbuf, void __user **pubuf,
638 unsigned int live_sz)
639 {
640 int i, j, start, start_pad, err;
641 unsigned long long fill = ~0ull;
642 unsigned int cp_sz, pad_sz;
643
644 cp_sz = min(regset->size, live_sz);
645 pad_sz = regset->size - cp_sz;
646 WARN_ON(pad_sz % sizeof(fill));
647
648 i = start = err = 0;
649 for (; i < NUM_FPU_REGS; i++, start += regset->size) {
650 err |= user_regset_copyout(ppos, pcount, pkbuf, pubuf,
651 &target->thread.fpu.fpr[i],
652 start, start + cp_sz);
653
654 start_pad = start + cp_sz;
655 for (j = 0; j < (pad_sz / sizeof(fill)); j++) {
656 err |= user_regset_copyout(ppos, pcount, pkbuf, pubuf,
657 &fill, start_pad,
658 start_pad + sizeof(fill));
659 start_pad += sizeof(fill);
660 }
661 }
662
663 return err;
664 }
665
666 static int msa_get(struct task_struct *target,
667 const struct user_regset *regset,
668 unsigned int pos, unsigned int count,
669 void *kbuf, void __user *ubuf)
670 {
671 const unsigned int wr_size = NUM_FPU_REGS * regset->size;
672 const struct msa_control_regs ctrl_regs = {
673 .fir = boot_cpu_data.fpu_id,
674 .fcsr = target->thread.fpu.fcr31,
675 .msair = boot_cpu_data.msa_id,
676 .msacsr = target->thread.fpu.msacsr,
677 };
678 int err;
679
680 if (!tsk_used_math(target)) {
681 /* The task hasn't used FP or MSA, fill with 0xff */
682 err = copy_pad_fprs(target, regset, &pos, &count,
683 &kbuf, &ubuf, 0);
684 } else if (!test_tsk_thread_flag(target, TIF_MSA_CTX_LIVE)) {
685 /* Copy scalar FP context, fill the rest with 0xff */
686 err = copy_pad_fprs(target, regset, &pos, &count,
687 &kbuf, &ubuf, 8);
688 } else if (sizeof(target->thread.fpu.fpr[0]) == regset->size) {
689 /* Trivially copy the vector registers */
690 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
691 &target->thread.fpu.fpr,
692 0, wr_size);
693 } else {
694 /* Copy as much context as possible, fill the rest with 0xff */
695 err = copy_pad_fprs(target, regset, &pos, &count,
696 &kbuf, &ubuf,
697 sizeof(target->thread.fpu.fpr[0]));
698 }
699
700 err |= user_regset_copyout(&pos, &count, &kbuf, &ubuf,
701 &ctrl_regs, wr_size,
702 wr_size + sizeof(ctrl_regs));
703 return err;
704 }
705
706 static int msa_set(struct task_struct *target,
707 const struct user_regset *regset,
708 unsigned int pos, unsigned int count,
709 const void *kbuf, const void __user *ubuf)
710 {
711 const unsigned int wr_size = NUM_FPU_REGS * regset->size;
712 struct msa_control_regs ctrl_regs;
713 unsigned int cp_sz;
714 int i, err, start;
715
716 init_fp_ctx(target);
717
718 if (sizeof(target->thread.fpu.fpr[0]) == regset->size) {
719 /* Trivially copy the vector registers */
720 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
721 &target->thread.fpu.fpr,
722 0, wr_size);
723 } else {
724 /* Copy as much context as possible */
725 cp_sz = min_t(unsigned int, regset->size,
726 sizeof(target->thread.fpu.fpr[0]));
727
728 i = start = err = 0;
729 for (; i < NUM_FPU_REGS; i++, start += regset->size) {
730 err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
731 &target->thread.fpu.fpr[i],
732 start, start + cp_sz);
733 }
734 }
735
736 if (!err)
737 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl_regs,
738 wr_size, wr_size + sizeof(ctrl_regs));
739 if (!err) {
740 target->thread.fpu.fcr31 = ctrl_regs.fcsr & ~FPU_CSR_ALL_X;
741 target->thread.fpu.msacsr = ctrl_regs.msacsr & ~MSA_CSR_CAUSEF;
742 }
743
744 return err;
745 }
746
747 #endif /* CONFIG_CPU_HAS_MSA */
748
749 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
750
751 /*
752 * Copy the DSP context to the supplied 32-bit NT_MIPS_DSP buffer.
753 */
754 static int dsp32_get(struct task_struct *target,
755 const struct user_regset *regset,
756 unsigned int pos, unsigned int count,
757 void *kbuf, void __user *ubuf)
758 {
759 unsigned int start, num_regs, i;
760 u32 dspregs[NUM_DSP_REGS + 1];
761
762 BUG_ON(count % sizeof(u32));
763
764 if (!cpu_has_dsp)
765 return -EIO;
766
767 start = pos / sizeof(u32);
768 num_regs = count / sizeof(u32);
769
770 if (start + num_regs > NUM_DSP_REGS + 1)
771 return -EIO;
772
773 for (i = start; i < num_regs; i++)
774 switch (i) {
775 case 0 ... NUM_DSP_REGS - 1:
776 dspregs[i] = target->thread.dsp.dspr[i];
777 break;
778 case NUM_DSP_REGS:
779 dspregs[i] = target->thread.dsp.dspcontrol;
780 break;
781 }
782 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, dspregs, 0,
783 sizeof(dspregs));
784 }
785
786 /*
787 * Copy the supplied 32-bit NT_MIPS_DSP buffer to the DSP context.
788 */
789 static int dsp32_set(struct task_struct *target,
790 const struct user_regset *regset,
791 unsigned int pos, unsigned int count,
792 const void *kbuf, const void __user *ubuf)
793 {
794 unsigned int start, num_regs, i;
795 u32 dspregs[NUM_DSP_REGS + 1];
796 int err;
797
798 BUG_ON(count % sizeof(u32));
799
800 if (!cpu_has_dsp)
801 return -EIO;
802
803 start = pos / sizeof(u32);
804 num_regs = count / sizeof(u32);
805
806 if (start + num_regs > NUM_DSP_REGS + 1)
807 return -EIO;
808
809 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, dspregs, 0,
810 sizeof(dspregs));
811 if (err)
812 return err;
813
814 for (i = start; i < num_regs; i++)
815 switch (i) {
816 case 0 ... NUM_DSP_REGS - 1:
817 target->thread.dsp.dspr[i] = (s32)dspregs[i];
818 break;
819 case NUM_DSP_REGS:
820 target->thread.dsp.dspcontrol = (s32)dspregs[i];
821 break;
822 }
823
824 return 0;
825 }
826
827 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
828
829 #ifdef CONFIG_64BIT
830
831 /*
832 * Copy the DSP context to the supplied 64-bit NT_MIPS_DSP buffer.
833 */
834 static int dsp64_get(struct task_struct *target,
835 const struct user_regset *regset,
836 unsigned int pos, unsigned int count,
837 void *kbuf, void __user *ubuf)
838 {
839 unsigned int start, num_regs, i;
840 u64 dspregs[NUM_DSP_REGS + 1];
841
842 BUG_ON(count % sizeof(u64));
843
844 if (!cpu_has_dsp)
845 return -EIO;
846
847 start = pos / sizeof(u64);
848 num_regs = count / sizeof(u64);
849
850 if (start + num_regs > NUM_DSP_REGS + 1)
851 return -EIO;
852
853 for (i = start; i < num_regs; i++)
854 switch (i) {
855 case 0 ... NUM_DSP_REGS - 1:
856 dspregs[i] = target->thread.dsp.dspr[i];
857 break;
858 case NUM_DSP_REGS:
859 dspregs[i] = target->thread.dsp.dspcontrol;
860 break;
861 }
862 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, dspregs, 0,
863 sizeof(dspregs));
864 }
865
866 /*
867 * Copy the supplied 64-bit NT_MIPS_DSP buffer to the DSP context.
868 */
869 static int dsp64_set(struct task_struct *target,
870 const struct user_regset *regset,
871 unsigned int pos, unsigned int count,
872 const void *kbuf, const void __user *ubuf)
873 {
874 unsigned int start, num_regs, i;
875 u64 dspregs[NUM_DSP_REGS + 1];
876 int err;
877
878 BUG_ON(count % sizeof(u64));
879
880 if (!cpu_has_dsp)
881 return -EIO;
882
883 start = pos / sizeof(u64);
884 num_regs = count / sizeof(u64);
885
886 if (start + num_regs > NUM_DSP_REGS + 1)
887 return -EIO;
888
889 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, dspregs, 0,
890 sizeof(dspregs));
891 if (err)
892 return err;
893
894 for (i = start; i < num_regs; i++)
895 switch (i) {
896 case 0 ... NUM_DSP_REGS - 1:
897 target->thread.dsp.dspr[i] = dspregs[i];
898 break;
899 case NUM_DSP_REGS:
900 target->thread.dsp.dspcontrol = dspregs[i];
901 break;
902 }
903
904 return 0;
905 }
906
907 #endif /* CONFIG_64BIT */
908
909 /*
910 * Determine whether the DSP context is present.
911 */
912 static int dsp_active(struct task_struct *target,
913 const struct user_regset *regset)
914 {
915 return cpu_has_dsp ? NUM_DSP_REGS + 1 : -ENODEV;
916 }
917
918 enum mips_regset {
919 REGSET_GPR,
920 REGSET_DSP,
921 #ifdef CONFIG_MIPS_FP_SUPPORT
922 REGSET_FPR,
923 REGSET_FP_MODE,
924 #endif
925 #ifdef CONFIG_CPU_HAS_MSA
926 REGSET_MSA,
927 #endif
928 };
929
930 struct pt_regs_offset {
931 const char *name;
932 int offset;
933 };
934
935 #define REG_OFFSET_NAME(reg, r) { \
936 .name = #reg, \
937 .offset = offsetof(struct pt_regs, r) \
938 }
939
940 #define REG_OFFSET_END { \
941 .name = NULL, \
942 .offset = 0 \
943 }
944
945 static const struct pt_regs_offset regoffset_table[] = {
946 REG_OFFSET_NAME(r0, regs[0]),
947 REG_OFFSET_NAME(r1, regs[1]),
948 REG_OFFSET_NAME(r2, regs[2]),
949 REG_OFFSET_NAME(r3, regs[3]),
950 REG_OFFSET_NAME(r4, regs[4]),
951 REG_OFFSET_NAME(r5, regs[5]),
952 REG_OFFSET_NAME(r6, regs[6]),
953 REG_OFFSET_NAME(r7, regs[7]),
954 REG_OFFSET_NAME(r8, regs[8]),
955 REG_OFFSET_NAME(r9, regs[9]),
956 REG_OFFSET_NAME(r10, regs[10]),
957 REG_OFFSET_NAME(r11, regs[11]),
958 REG_OFFSET_NAME(r12, regs[12]),
959 REG_OFFSET_NAME(r13, regs[13]),
960 REG_OFFSET_NAME(r14, regs[14]),
961 REG_OFFSET_NAME(r15, regs[15]),
962 REG_OFFSET_NAME(r16, regs[16]),
963 REG_OFFSET_NAME(r17, regs[17]),
964 REG_OFFSET_NAME(r18, regs[18]),
965 REG_OFFSET_NAME(r19, regs[19]),
966 REG_OFFSET_NAME(r20, regs[20]),
967 REG_OFFSET_NAME(r21, regs[21]),
968 REG_OFFSET_NAME(r22, regs[22]),
969 REG_OFFSET_NAME(r23, regs[23]),
970 REG_OFFSET_NAME(r24, regs[24]),
971 REG_OFFSET_NAME(r25, regs[25]),
972 REG_OFFSET_NAME(r26, regs[26]),
973 REG_OFFSET_NAME(r27, regs[27]),
974 REG_OFFSET_NAME(r28, regs[28]),
975 REG_OFFSET_NAME(r29, regs[29]),
976 REG_OFFSET_NAME(r30, regs[30]),
977 REG_OFFSET_NAME(r31, regs[31]),
978 REG_OFFSET_NAME(c0_status, cp0_status),
979 REG_OFFSET_NAME(hi, hi),
980 REG_OFFSET_NAME(lo, lo),
981 #ifdef CONFIG_CPU_HAS_SMARTMIPS
982 REG_OFFSET_NAME(acx, acx),
983 #endif
984 REG_OFFSET_NAME(c0_badvaddr, cp0_badvaddr),
985 REG_OFFSET_NAME(c0_cause, cp0_cause),
986 REG_OFFSET_NAME(c0_epc, cp0_epc),
987 #ifdef CONFIG_CPU_CAVIUM_OCTEON
988 REG_OFFSET_NAME(mpl0, mpl[0]),
989 REG_OFFSET_NAME(mpl1, mpl[1]),
990 REG_OFFSET_NAME(mpl2, mpl[2]),
991 REG_OFFSET_NAME(mtp0, mtp[0]),
992 REG_OFFSET_NAME(mtp1, mtp[1]),
993 REG_OFFSET_NAME(mtp2, mtp[2]),
994 #endif
995 REG_OFFSET_END,
996 };
997
998 /**
999 * regs_query_register_offset() - query register offset from its name
1000 * @name: the name of a register
1001 *
1002 * regs_query_register_offset() returns the offset of a register in struct
1003 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
1004 */
1005 int regs_query_register_offset(const char *name)
1006 {
1007 const struct pt_regs_offset *roff;
1008 for (roff = regoffset_table; roff->name != NULL; roff++)
1009 if (!strcmp(roff->name, name))
1010 return roff->offset;
1011 return -EINVAL;
1012 }
1013
1014 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
1015
1016 static const struct user_regset mips_regsets[] = {
1017 [REGSET_GPR] = {
1018 .core_note_type = NT_PRSTATUS,
1019 .n = ELF_NGREG,
1020 .size = sizeof(unsigned int),
1021 .align = sizeof(unsigned int),
1022 .get = gpr32_get,
1023 .set = gpr32_set,
1024 },
1025 [REGSET_DSP] = {
1026 .core_note_type = NT_MIPS_DSP,
1027 .n = NUM_DSP_REGS + 1,
1028 .size = sizeof(u32),
1029 .align = sizeof(u32),
1030 .get = dsp32_get,
1031 .set = dsp32_set,
1032 .active = dsp_active,
1033 },
1034 #ifdef CONFIG_MIPS_FP_SUPPORT
1035 [REGSET_FPR] = {
1036 .core_note_type = NT_PRFPREG,
1037 .n = ELF_NFPREG,
1038 .size = sizeof(elf_fpreg_t),
1039 .align = sizeof(elf_fpreg_t),
1040 .get = fpr_get,
1041 .set = fpr_set,
1042 },
1043 [REGSET_FP_MODE] = {
1044 .core_note_type = NT_MIPS_FP_MODE,
1045 .n = 1,
1046 .size = sizeof(int),
1047 .align = sizeof(int),
1048 .get = fp_mode_get,
1049 .set = fp_mode_set,
1050 },
1051 #endif
1052 #ifdef CONFIG_CPU_HAS_MSA
1053 [REGSET_MSA] = {
1054 .core_note_type = NT_MIPS_MSA,
1055 .n = NUM_FPU_REGS + 1,
1056 .size = 16,
1057 .align = 16,
1058 .get = msa_get,
1059 .set = msa_set,
1060 },
1061 #endif
1062 };
1063
1064 static const struct user_regset_view user_mips_view = {
1065 .name = "mips",
1066 .e_machine = ELF_ARCH,
1067 .ei_osabi = ELF_OSABI,
1068 .regsets = mips_regsets,
1069 .n = ARRAY_SIZE(mips_regsets),
1070 };
1071
1072 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
1073
1074 #ifdef CONFIG_64BIT
1075
1076 static const struct user_regset mips64_regsets[] = {
1077 [REGSET_GPR] = {
1078 .core_note_type = NT_PRSTATUS,
1079 .n = ELF_NGREG,
1080 .size = sizeof(unsigned long),
1081 .align = sizeof(unsigned long),
1082 .get = gpr64_get,
1083 .set = gpr64_set,
1084 },
1085 [REGSET_DSP] = {
1086 .core_note_type = NT_MIPS_DSP,
1087 .n = NUM_DSP_REGS + 1,
1088 .size = sizeof(u64),
1089 .align = sizeof(u64),
1090 .get = dsp64_get,
1091 .set = dsp64_set,
1092 .active = dsp_active,
1093 },
1094 #ifdef CONFIG_MIPS_FP_SUPPORT
1095 [REGSET_FP_MODE] = {
1096 .core_note_type = NT_MIPS_FP_MODE,
1097 .n = 1,
1098 .size = sizeof(int),
1099 .align = sizeof(int),
1100 .get = fp_mode_get,
1101 .set = fp_mode_set,
1102 },
1103 [REGSET_FPR] = {
1104 .core_note_type = NT_PRFPREG,
1105 .n = ELF_NFPREG,
1106 .size = sizeof(elf_fpreg_t),
1107 .align = sizeof(elf_fpreg_t),
1108 .get = fpr_get,
1109 .set = fpr_set,
1110 },
1111 #endif
1112 #ifdef CONFIG_CPU_HAS_MSA
1113 [REGSET_MSA] = {
1114 .core_note_type = NT_MIPS_MSA,
1115 .n = NUM_FPU_REGS + 1,
1116 .size = 16,
1117 .align = 16,
1118 .get = msa_get,
1119 .set = msa_set,
1120 },
1121 #endif
1122 };
1123
1124 static const struct user_regset_view user_mips64_view = {
1125 .name = "mips64",
1126 .e_machine = ELF_ARCH,
1127 .ei_osabi = ELF_OSABI,
1128 .regsets = mips64_regsets,
1129 .n = ARRAY_SIZE(mips64_regsets),
1130 };
1131
1132 #ifdef CONFIG_MIPS32_N32
1133
1134 static const struct user_regset_view user_mipsn32_view = {
1135 .name = "mipsn32",
1136 .e_flags = EF_MIPS_ABI2,
1137 .e_machine = ELF_ARCH,
1138 .ei_osabi = ELF_OSABI,
1139 .regsets = mips64_regsets,
1140 .n = ARRAY_SIZE(mips64_regsets),
1141 };
1142
1143 #endif /* CONFIG_MIPS32_N32 */
1144
1145 #endif /* CONFIG_64BIT */
1146
1147 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1148 {
1149 #ifdef CONFIG_32BIT
1150 return &user_mips_view;
1151 #else
1152 #ifdef CONFIG_MIPS32_O32
1153 if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
1154 return &user_mips_view;
1155 #endif
1156 #ifdef CONFIG_MIPS32_N32
1157 if (test_tsk_thread_flag(task, TIF_32BIT_ADDR))
1158 return &user_mipsn32_view;
1159 #endif
1160 return &user_mips64_view;
1161 #endif
1162 }
1163
1164 long arch_ptrace(struct task_struct *child, long request,
1165 unsigned long addr, unsigned long data)
1166 {
1167 int ret;
1168 void __user *addrp = (void __user *) addr;
1169 void __user *datavp = (void __user *) data;
1170 unsigned long __user *datalp = (void __user *) data;
1171
1172 switch (request) {
1173 /* when I and D space are separate, these will need to be fixed. */
1174 case PTRACE_PEEKTEXT: /* read word at location addr. */
1175 case PTRACE_PEEKDATA:
1176 ret = generic_ptrace_peekdata(child, addr, data);
1177 break;
1178
1179 /* Read the word at location addr in the USER area. */
1180 case PTRACE_PEEKUSR: {
1181 struct pt_regs *regs;
1182 unsigned long tmp = 0;
1183
1184 regs = task_pt_regs(child);
1185 ret = 0; /* Default return value. */
1186
1187 switch (addr) {
1188 case 0 ... 31:
1189 tmp = regs->regs[addr];
1190 break;
1191 #ifdef CONFIG_MIPS_FP_SUPPORT
1192 case FPR_BASE ... FPR_BASE + 31: {
1193 union fpureg *fregs;
1194
1195 if (!tsk_used_math(child)) {
1196 /* FP not yet used */
1197 tmp = -1;
1198 break;
1199 }
1200 fregs = get_fpu_regs(child);
1201
1202 #ifdef CONFIG_32BIT
1203 if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
1204 /*
1205 * The odd registers are actually the high
1206 * order bits of the values stored in the even
1207 * registers.
1208 */
1209 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
1210 addr & 1);
1211 break;
1212 }
1213 #endif
1214 tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
1215 break;
1216 }
1217 case FPC_CSR:
1218 tmp = child->thread.fpu.fcr31;
1219 break;
1220 case FPC_EIR:
1221 /* implementation / version register */
1222 tmp = boot_cpu_data.fpu_id;
1223 break;
1224 #endif
1225 case PC:
1226 tmp = regs->cp0_epc;
1227 break;
1228 case CAUSE:
1229 tmp = regs->cp0_cause;
1230 break;
1231 case BADVADDR:
1232 tmp = regs->cp0_badvaddr;
1233 break;
1234 case MMHI:
1235 tmp = regs->hi;
1236 break;
1237 case MMLO:
1238 tmp = regs->lo;
1239 break;
1240 #ifdef CONFIG_CPU_HAS_SMARTMIPS
1241 case ACX:
1242 tmp = regs->acx;
1243 break;
1244 #endif
1245 case DSP_BASE ... DSP_BASE + 5: {
1246 dspreg_t *dregs;
1247
1248 if (!cpu_has_dsp) {
1249 tmp = 0;
1250 ret = -EIO;
1251 goto out;
1252 }
1253 dregs = __get_dsp_regs(child);
1254 tmp = dregs[addr - DSP_BASE];
1255 break;
1256 }
1257 case DSP_CONTROL:
1258 if (!cpu_has_dsp) {
1259 tmp = 0;
1260 ret = -EIO;
1261 goto out;
1262 }
1263 tmp = child->thread.dsp.dspcontrol;
1264 break;
1265 default:
1266 tmp = 0;
1267 ret = -EIO;
1268 goto out;
1269 }
1270 ret = put_user(tmp, datalp);
1271 break;
1272 }
1273
1274 /* when I and D space are separate, this will have to be fixed. */
1275 case PTRACE_POKETEXT: /* write the word at location addr. */
1276 case PTRACE_POKEDATA:
1277 ret = generic_ptrace_pokedata(child, addr, data);
1278 break;
1279
1280 case PTRACE_POKEUSR: {
1281 struct pt_regs *regs;
1282 ret = 0;
1283 regs = task_pt_regs(child);
1284
1285 switch (addr) {
1286 case 0 ... 31:
1287 regs->regs[addr] = data;
1288 /* System call number may have been changed */
1289 if (addr == 2)
1290 mips_syscall_update_nr(child, regs);
1291 else if (addr == 4 &&
1292 mips_syscall_is_indirect(child, regs))
1293 mips_syscall_update_nr(child, regs);
1294 break;
1295 #ifdef CONFIG_MIPS_FP_SUPPORT
1296 case FPR_BASE ... FPR_BASE + 31: {
1297 union fpureg *fregs = get_fpu_regs(child);
1298
1299 init_fp_ctx(child);
1300 #ifdef CONFIG_32BIT
1301 if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
1302 /*
1303 * The odd registers are actually the high
1304 * order bits of the values stored in the even
1305 * registers.
1306 */
1307 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
1308 addr & 1, data);
1309 break;
1310 }
1311 #endif
1312 set_fpr64(&fregs[addr - FPR_BASE], 0, data);
1313 break;
1314 }
1315 case FPC_CSR:
1316 init_fp_ctx(child);
1317 ptrace_setfcr31(child, data);
1318 break;
1319 #endif
1320 case PC:
1321 regs->cp0_epc = data;
1322 break;
1323 case MMHI:
1324 regs->hi = data;
1325 break;
1326 case MMLO:
1327 regs->lo = data;
1328 break;
1329 #ifdef CONFIG_CPU_HAS_SMARTMIPS
1330 case ACX:
1331 regs->acx = data;
1332 break;
1333 #endif
1334 case DSP_BASE ... DSP_BASE + 5: {
1335 dspreg_t *dregs;
1336
1337 if (!cpu_has_dsp) {
1338 ret = -EIO;
1339 break;
1340 }
1341
1342 dregs = __get_dsp_regs(child);
1343 dregs[addr - DSP_BASE] = data;
1344 break;
1345 }
1346 case DSP_CONTROL:
1347 if (!cpu_has_dsp) {
1348 ret = -EIO;
1349 break;
1350 }
1351 child->thread.dsp.dspcontrol = data;
1352 break;
1353 default:
1354 /* The rest are not allowed. */
1355 ret = -EIO;
1356 break;
1357 }
1358 break;
1359 }
1360
1361 case PTRACE_GETREGS:
1362 ret = ptrace_getregs(child, datavp);
1363 break;
1364
1365 case PTRACE_SETREGS:
1366 ret = ptrace_setregs(child, datavp);
1367 break;
1368
1369 #ifdef CONFIG_MIPS_FP_SUPPORT
1370 case PTRACE_GETFPREGS:
1371 ret = ptrace_getfpregs(child, datavp);
1372 break;
1373
1374 case PTRACE_SETFPREGS:
1375 ret = ptrace_setfpregs(child, datavp);
1376 break;
1377 #endif
1378 case PTRACE_GET_THREAD_AREA:
1379 ret = put_user(task_thread_info(child)->tp_value, datalp);
1380 break;
1381
1382 case PTRACE_GET_WATCH_REGS:
1383 ret = ptrace_get_watch_regs(child, addrp);
1384 break;
1385
1386 case PTRACE_SET_WATCH_REGS:
1387 ret = ptrace_set_watch_regs(child, addrp);
1388 break;
1389
1390 default:
1391 ret = ptrace_request(child, request, addr, data);
1392 break;
1393 }
1394 out:
1395 return ret;
1396 }
1397
1398 /*
1399 * Notification of system call entry/exit
1400 * - triggered by current->work.syscall_trace
1401 */
1402 asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
1403 {
1404 user_exit();
1405
1406 current_thread_info()->syscall = syscall;
1407
1408 if (test_thread_flag(TIF_SYSCALL_TRACE)) {
1409 if (tracehook_report_syscall_entry(regs))
1410 return -1;
1411 syscall = current_thread_info()->syscall;
1412 }
1413
1414 #ifdef CONFIG_SECCOMP
1415 if (unlikely(test_thread_flag(TIF_SECCOMP))) {
1416 int ret, i;
1417 struct seccomp_data sd;
1418 unsigned long args[6];
1419
1420 sd.nr = syscall;
1421 sd.arch = syscall_get_arch(current);
1422 syscall_get_arguments(current, regs, args);
1423 for (i = 0; i < 6; i++)
1424 sd.args[i] = args[i];
1425 sd.instruction_pointer = KSTK_EIP(current);
1426
1427 ret = __secure_computing(&sd);
1428 if (ret == -1)
1429 return ret;
1430 syscall = current_thread_info()->syscall;
1431 }
1432 #endif
1433
1434 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1435 trace_sys_enter(regs, regs->regs[2]);
1436
1437 audit_syscall_entry(syscall, regs->regs[4], regs->regs[5],
1438 regs->regs[6], regs->regs[7]);
1439
1440 /*
1441 * Negative syscall numbers are mistaken for rejected syscalls, but
1442 * won't have had the return value set appropriately, so we do so now.
1443 */
1444 if (syscall < 0)
1445 syscall_set_return_value(current, regs, -ENOSYS, 0);
1446 return syscall;
1447 }
1448
1449 /*
1450 * Notification of system call entry/exit
1451 * - triggered by current->work.syscall_trace
1452 */
1453 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1454 {
1455 /*
1456 * We may come here right after calling schedule_user()
1457 * or do_notify_resume(), in which case we can be in RCU
1458 * user mode.
1459 */
1460 user_exit();
1461
1462 audit_syscall_exit(regs);
1463
1464 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1465 trace_sys_exit(regs, regs_return_value(regs));
1466
1467 if (test_thread_flag(TIF_SYSCALL_TRACE))
1468 tracehook_report_syscall_exit(regs, 0);
1469
1470 user_enter();
1471 }
Linux with added FPC-III support