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Merge tag 'pinctrl-v4.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[mirror_ubuntu-artful-kernel.git] / arch / mips / kernel / ptrace.c
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/mm.h>
23 #include <linux/errno.h>
24 #include <linux/ptrace.h>
25 #include <linux/regset.h>
26 #include <linux/smp.h>
27 #include <linux/security.h>
28 #include <linux/stddef.h>
29 #include <linux/tracehook.h>
30 #include <linux/audit.h>
31 #include <linux/seccomp.h>
32 #include <linux/ftrace.h>
33
34 #include <asm/byteorder.h>
35 #include <asm/cpu.h>
36 #include <asm/cpu-info.h>
37 #include <asm/dsp.h>
38 #include <asm/fpu.h>
39 #include <asm/mipsregs.h>
40 #include <asm/mipsmtregs.h>
41 #include <asm/pgtable.h>
42 #include <asm/page.h>
43 #include <asm/syscall.h>
44 #include <linux/uaccess.h>
45 #include <asm/bootinfo.h>
46 #include <asm/reg.h>
47
48 #define CREATE_TRACE_POINTS
49 #include <trace/events/syscalls.h>
50
51 static void init_fp_ctx(struct task_struct *target)
52 {
53 /* If FP has been used then the target already has context */
54 if (tsk_used_math(target))
55 return;
56
57 /* Begin with data registers set to all 1s... */
58 memset(&target->thread.fpu.fpr, ~0, sizeof(target->thread.fpu.fpr));
59
60 /* FCSR has been preset by `mips_set_personality_nan'. */
61
62 /*
63 * Record that the target has "used" math, such that the context
64 * just initialised, and any modifications made by the caller,
65 * aren't discarded.
66 */
67 set_stopped_child_used_math(target);
68 }
69
70 /*
71 * Called by kernel/ptrace.c when detaching..
72 *
73 * Make sure single step bits etc are not set.
74 */
75 void ptrace_disable(struct task_struct *child)
76 {
77 /* Don't load the watchpoint registers for the ex-child. */
78 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
79 }
80
81 /*
82 * Poke at FCSR according to its mask. Set the Cause bits even
83 * if a corresponding Enable bit is set. This will be noticed at
84 * the time the thread is switched to and SIGFPE thrown accordingly.
85 */
86 static void ptrace_setfcr31(struct task_struct *child, u32 value)
87 {
88 u32 fcr31;
89 u32 mask;
90
91 fcr31 = child->thread.fpu.fcr31;
92 mask = boot_cpu_data.fpu_msk31;
93 child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask);
94 }
95
96 /*
97 * Read a general register set. We always use the 64-bit format, even
98 * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
99 * Registers are sign extended to fill the available space.
100 */
101 int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data)
102 {
103 struct pt_regs *regs;
104 int i;
105
106 if (!access_ok(VERIFY_WRITE, data, 38 * 8))
107 return -EIO;
108
109 regs = task_pt_regs(child);
110
111 for (i = 0; i < 32; i++)
112 __put_user((long)regs->regs[i], (__s64 __user *)&data->regs[i]);
113 __put_user((long)regs->lo, (__s64 __user *)&data->lo);
114 __put_user((long)regs->hi, (__s64 __user *)&data->hi);
115 __put_user((long)regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
116 __put_user((long)regs->cp0_badvaddr, (__s64 __user *)&data->cp0_badvaddr);
117 __put_user((long)regs->cp0_status, (__s64 __user *)&data->cp0_status);
118 __put_user((long)regs->cp0_cause, (__s64 __user *)&data->cp0_cause);
119
120 return 0;
121 }
122
123 /*
124 * Write a general register set. As for PTRACE_GETREGS, we always use
125 * the 64-bit format. On a 32-bit kernel only the lower order half
126 * (according to endianness) will be used.
127 */
128 int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data)
129 {
130 struct pt_regs *regs;
131 int i;
132
133 if (!access_ok(VERIFY_READ, data, 38 * 8))
134 return -EIO;
135
136 regs = task_pt_regs(child);
137
138 for (i = 0; i < 32; i++)
139 __get_user(regs->regs[i], (__s64 __user *)&data->regs[i]);
140 __get_user(regs->lo, (__s64 __user *)&data->lo);
141 __get_user(regs->hi, (__s64 __user *)&data->hi);
142 __get_user(regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
143
144 /* badvaddr, status, and cause may not be written. */
145
146 return 0;
147 }
148
149 int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
150 {
151 int i;
152
153 if (!access_ok(VERIFY_WRITE, data, 33 * 8))
154 return -EIO;
155
156 if (tsk_used_math(child)) {
157 union fpureg *fregs = get_fpu_regs(child);
158 for (i = 0; i < 32; i++)
159 __put_user(get_fpr64(&fregs[i], 0),
160 i + (__u64 __user *)data);
161 } else {
162 for (i = 0; i < 32; i++)
163 __put_user((__u64) -1, i + (__u64 __user *) data);
164 }
165
166 __put_user(child->thread.fpu.fcr31, data + 64);
167 __put_user(boot_cpu_data.fpu_id, data + 65);
168
169 return 0;
170 }
171
172 int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
173 {
174 union fpureg *fregs;
175 u64 fpr_val;
176 u32 value;
177 int i;
178
179 if (!access_ok(VERIFY_READ, data, 33 * 8))
180 return -EIO;
181
182 init_fp_ctx(child);
183 fregs = get_fpu_regs(child);
184
185 for (i = 0; i < 32; i++) {
186 __get_user(fpr_val, i + (__u64 __user *)data);
187 set_fpr64(&fregs[i], 0, fpr_val);
188 }
189
190 __get_user(value, data + 64);
191 ptrace_setfcr31(child, value);
192
193 /* FIR may not be written. */
194
195 return 0;
196 }
197
198 int ptrace_get_watch_regs(struct task_struct *child,
199 struct pt_watch_regs __user *addr)
200 {
201 enum pt_watch_style style;
202 int i;
203
204 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
205 return -EIO;
206 if (!access_ok(VERIFY_WRITE, addr, sizeof(struct pt_watch_regs)))
207 return -EIO;
208
209 #ifdef CONFIG_32BIT
210 style = pt_watch_style_mips32;
211 #define WATCH_STYLE mips32
212 #else
213 style = pt_watch_style_mips64;
214 #define WATCH_STYLE mips64
215 #endif
216
217 __put_user(style, &addr->style);
218 __put_user(boot_cpu_data.watch_reg_use_cnt,
219 &addr->WATCH_STYLE.num_valid);
220 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
221 __put_user(child->thread.watch.mips3264.watchlo[i],
222 &addr->WATCH_STYLE.watchlo[i]);
223 __put_user(child->thread.watch.mips3264.watchhi[i] &
224 (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW),
225 &addr->WATCH_STYLE.watchhi[i]);
226 __put_user(boot_cpu_data.watch_reg_masks[i],
227 &addr->WATCH_STYLE.watch_masks[i]);
228 }
229 for (; i < 8; i++) {
230 __put_user(0, &addr->WATCH_STYLE.watchlo[i]);
231 __put_user(0, &addr->WATCH_STYLE.watchhi[i]);
232 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]);
233 }
234
235 return 0;
236 }
237
238 int ptrace_set_watch_regs(struct task_struct *child,
239 struct pt_watch_regs __user *addr)
240 {
241 int i;
242 int watch_active = 0;
243 unsigned long lt[NUM_WATCH_REGS];
244 u16 ht[NUM_WATCH_REGS];
245
246 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
247 return -EIO;
248 if (!access_ok(VERIFY_READ, addr, sizeof(struct pt_watch_regs)))
249 return -EIO;
250 /* Check the values. */
251 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
252 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]);
253 #ifdef CONFIG_32BIT
254 if (lt[i] & __UA_LIMIT)
255 return -EINVAL;
256 #else
257 if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) {
258 if (lt[i] & 0xffffffff80000000UL)
259 return -EINVAL;
260 } else {
261 if (lt[i] & __UA_LIMIT)
262 return -EINVAL;
263 }
264 #endif
265 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
266 if (ht[i] & ~MIPS_WATCHHI_MASK)
267 return -EINVAL;
268 }
269 /* Install them. */
270 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
271 if (lt[i] & MIPS_WATCHLO_IRW)
272 watch_active = 1;
273 child->thread.watch.mips3264.watchlo[i] = lt[i];
274 /* Set the G bit. */
275 child->thread.watch.mips3264.watchhi[i] = ht[i];
276 }
277
278 if (watch_active)
279 set_tsk_thread_flag(child, TIF_LOAD_WATCH);
280 else
281 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
282
283 return 0;
284 }
285
286 /* regset get/set implementations */
287
288 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
289
290 static int gpr32_get(struct task_struct *target,
291 const struct user_regset *regset,
292 unsigned int pos, unsigned int count,
293 void *kbuf, void __user *ubuf)
294 {
295 struct pt_regs *regs = task_pt_regs(target);
296 u32 uregs[ELF_NGREG] = {};
297
298 mips_dump_regs32(uregs, regs);
299 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
300 sizeof(uregs));
301 }
302
303 static int gpr32_set(struct task_struct *target,
304 const struct user_regset *regset,
305 unsigned int pos, unsigned int count,
306 const void *kbuf, const void __user *ubuf)
307 {
308 struct pt_regs *regs = task_pt_regs(target);
309 u32 uregs[ELF_NGREG];
310 unsigned start, num_regs, i;
311 int err;
312
313 start = pos / sizeof(u32);
314 num_regs = count / sizeof(u32);
315
316 if (start + num_regs > ELF_NGREG)
317 return -EIO;
318
319 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
320 sizeof(uregs));
321 if (err)
322 return err;
323
324 for (i = start; i < num_regs; i++) {
325 /*
326 * Cast all values to signed here so that if this is a 64-bit
327 * kernel, the supplied 32-bit values will be sign extended.
328 */
329 switch (i) {
330 case MIPS32_EF_R1 ... MIPS32_EF_R25:
331 /* k0/k1 are ignored. */
332 case MIPS32_EF_R28 ... MIPS32_EF_R31:
333 regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i];
334 break;
335 case MIPS32_EF_LO:
336 regs->lo = (s32)uregs[i];
337 break;
338 case MIPS32_EF_HI:
339 regs->hi = (s32)uregs[i];
340 break;
341 case MIPS32_EF_CP0_EPC:
342 regs->cp0_epc = (s32)uregs[i];
343 break;
344 }
345 }
346
347 return 0;
348 }
349
350 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
351
352 #ifdef CONFIG_64BIT
353
354 static int gpr64_get(struct task_struct *target,
355 const struct user_regset *regset,
356 unsigned int pos, unsigned int count,
357 void *kbuf, void __user *ubuf)
358 {
359 struct pt_regs *regs = task_pt_regs(target);
360 u64 uregs[ELF_NGREG] = {};
361
362 mips_dump_regs64(uregs, regs);
363 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
364 sizeof(uregs));
365 }
366
367 static int gpr64_set(struct task_struct *target,
368 const struct user_regset *regset,
369 unsigned int pos, unsigned int count,
370 const void *kbuf, const void __user *ubuf)
371 {
372 struct pt_regs *regs = task_pt_regs(target);
373 u64 uregs[ELF_NGREG];
374 unsigned start, num_regs, i;
375 int err;
376
377 start = pos / sizeof(u64);
378 num_regs = count / sizeof(u64);
379
380 if (start + num_regs > ELF_NGREG)
381 return -EIO;
382
383 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
384 sizeof(uregs));
385 if (err)
386 return err;
387
388 for (i = start; i < num_regs; i++) {
389 switch (i) {
390 case MIPS64_EF_R1 ... MIPS64_EF_R25:
391 /* k0/k1 are ignored. */
392 case MIPS64_EF_R28 ... MIPS64_EF_R31:
393 regs->regs[i - MIPS64_EF_R0] = uregs[i];
394 break;
395 case MIPS64_EF_LO:
396 regs->lo = uregs[i];
397 break;
398 case MIPS64_EF_HI:
399 regs->hi = uregs[i];
400 break;
401 case MIPS64_EF_CP0_EPC:
402 regs->cp0_epc = uregs[i];
403 break;
404 }
405 }
406
407 return 0;
408 }
409
410 #endif /* CONFIG_64BIT */
411
412 static int fpr_get(struct task_struct *target,
413 const struct user_regset *regset,
414 unsigned int pos, unsigned int count,
415 void *kbuf, void __user *ubuf)
416 {
417 unsigned i;
418 int err;
419 u64 fpr_val;
420
421 /* XXX fcr31 */
422
423 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
424 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
425 &target->thread.fpu,
426 0, sizeof(elf_fpregset_t));
427
428 for (i = 0; i < NUM_FPU_REGS; i++) {
429 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
430 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
431 &fpr_val, i * sizeof(elf_fpreg_t),
432 (i + 1) * sizeof(elf_fpreg_t));
433 if (err)
434 return err;
435 }
436
437 return 0;
438 }
439
440 static int fpr_set(struct task_struct *target,
441 const struct user_regset *regset,
442 unsigned int pos, unsigned int count,
443 const void *kbuf, const void __user *ubuf)
444 {
445 unsigned i;
446 int err;
447 u64 fpr_val;
448
449 /* XXX fcr31 */
450
451 init_fp_ctx(target);
452
453 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
454 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
455 &target->thread.fpu,
456 0, sizeof(elf_fpregset_t));
457
458 for (i = 0; i < NUM_FPU_REGS; i++) {
459 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
460 &fpr_val, i * sizeof(elf_fpreg_t),
461 (i + 1) * sizeof(elf_fpreg_t));
462 if (err)
463 return err;
464 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
465 }
466
467 return 0;
468 }
469
470 enum mips_regset {
471 REGSET_GPR,
472 REGSET_FPR,
473 };
474
475 struct pt_regs_offset {
476 const char *name;
477 int offset;
478 };
479
480 #define REG_OFFSET_NAME(reg, r) { \
481 .name = #reg, \
482 .offset = offsetof(struct pt_regs, r) \
483 }
484
485 #define REG_OFFSET_END { \
486 .name = NULL, \
487 .offset = 0 \
488 }
489
490 static const struct pt_regs_offset regoffset_table[] = {
491 REG_OFFSET_NAME(r0, regs[0]),
492 REG_OFFSET_NAME(r1, regs[1]),
493 REG_OFFSET_NAME(r2, regs[2]),
494 REG_OFFSET_NAME(r3, regs[3]),
495 REG_OFFSET_NAME(r4, regs[4]),
496 REG_OFFSET_NAME(r5, regs[5]),
497 REG_OFFSET_NAME(r6, regs[6]),
498 REG_OFFSET_NAME(r7, regs[7]),
499 REG_OFFSET_NAME(r8, regs[8]),
500 REG_OFFSET_NAME(r9, regs[9]),
501 REG_OFFSET_NAME(r10, regs[10]),
502 REG_OFFSET_NAME(r11, regs[11]),
503 REG_OFFSET_NAME(r12, regs[12]),
504 REG_OFFSET_NAME(r13, regs[13]),
505 REG_OFFSET_NAME(r14, regs[14]),
506 REG_OFFSET_NAME(r15, regs[15]),
507 REG_OFFSET_NAME(r16, regs[16]),
508 REG_OFFSET_NAME(r17, regs[17]),
509 REG_OFFSET_NAME(r18, regs[18]),
510 REG_OFFSET_NAME(r19, regs[19]),
511 REG_OFFSET_NAME(r20, regs[20]),
512 REG_OFFSET_NAME(r21, regs[21]),
513 REG_OFFSET_NAME(r22, regs[22]),
514 REG_OFFSET_NAME(r23, regs[23]),
515 REG_OFFSET_NAME(r24, regs[24]),
516 REG_OFFSET_NAME(r25, regs[25]),
517 REG_OFFSET_NAME(r26, regs[26]),
518 REG_OFFSET_NAME(r27, regs[27]),
519 REG_OFFSET_NAME(r28, regs[28]),
520 REG_OFFSET_NAME(r29, regs[29]),
521 REG_OFFSET_NAME(r30, regs[30]),
522 REG_OFFSET_NAME(r31, regs[31]),
523 REG_OFFSET_NAME(c0_status, cp0_status),
524 REG_OFFSET_NAME(hi, hi),
525 REG_OFFSET_NAME(lo, lo),
526 #ifdef CONFIG_CPU_HAS_SMARTMIPS
527 REG_OFFSET_NAME(acx, acx),
528 #endif
529 REG_OFFSET_NAME(c0_badvaddr, cp0_badvaddr),
530 REG_OFFSET_NAME(c0_cause, cp0_cause),
531 REG_OFFSET_NAME(c0_epc, cp0_epc),
532 #ifdef CONFIG_CPU_CAVIUM_OCTEON
533 REG_OFFSET_NAME(mpl0, mpl[0]),
534 REG_OFFSET_NAME(mpl1, mpl[1]),
535 REG_OFFSET_NAME(mpl2, mpl[2]),
536 REG_OFFSET_NAME(mtp0, mtp[0]),
537 REG_OFFSET_NAME(mtp1, mtp[1]),
538 REG_OFFSET_NAME(mtp2, mtp[2]),
539 #endif
540 REG_OFFSET_END,
541 };
542
543 /**
544 * regs_query_register_offset() - query register offset from its name
545 * @name: the name of a register
546 *
547 * regs_query_register_offset() returns the offset of a register in struct
548 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
549 */
550 int regs_query_register_offset(const char *name)
551 {
552 const struct pt_regs_offset *roff;
553 for (roff = regoffset_table; roff->name != NULL; roff++)
554 if (!strcmp(roff->name, name))
555 return roff->offset;
556 return -EINVAL;
557 }
558
559 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
560
561 static const struct user_regset mips_regsets[] = {
562 [REGSET_GPR] = {
563 .core_note_type = NT_PRSTATUS,
564 .n = ELF_NGREG,
565 .size = sizeof(unsigned int),
566 .align = sizeof(unsigned int),
567 .get = gpr32_get,
568 .set = gpr32_set,
569 },
570 [REGSET_FPR] = {
571 .core_note_type = NT_PRFPREG,
572 .n = ELF_NFPREG,
573 .size = sizeof(elf_fpreg_t),
574 .align = sizeof(elf_fpreg_t),
575 .get = fpr_get,
576 .set = fpr_set,
577 },
578 };
579
580 static const struct user_regset_view user_mips_view = {
581 .name = "mips",
582 .e_machine = ELF_ARCH,
583 .ei_osabi = ELF_OSABI,
584 .regsets = mips_regsets,
585 .n = ARRAY_SIZE(mips_regsets),
586 };
587
588 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
589
590 #ifdef CONFIG_64BIT
591
592 static const struct user_regset mips64_regsets[] = {
593 [REGSET_GPR] = {
594 .core_note_type = NT_PRSTATUS,
595 .n = ELF_NGREG,
596 .size = sizeof(unsigned long),
597 .align = sizeof(unsigned long),
598 .get = gpr64_get,
599 .set = gpr64_set,
600 },
601 [REGSET_FPR] = {
602 .core_note_type = NT_PRFPREG,
603 .n = ELF_NFPREG,
604 .size = sizeof(elf_fpreg_t),
605 .align = sizeof(elf_fpreg_t),
606 .get = fpr_get,
607 .set = fpr_set,
608 },
609 };
610
611 static const struct user_regset_view user_mips64_view = {
612 .name = "mips64",
613 .e_machine = ELF_ARCH,
614 .ei_osabi = ELF_OSABI,
615 .regsets = mips64_regsets,
616 .n = ARRAY_SIZE(mips64_regsets),
617 };
618
619 #endif /* CONFIG_64BIT */
620
621 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
622 {
623 #ifdef CONFIG_32BIT
624 return &user_mips_view;
625 #else
626 #ifdef CONFIG_MIPS32_O32
627 if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
628 return &user_mips_view;
629 #endif
630 return &user_mips64_view;
631 #endif
632 }
633
634 long arch_ptrace(struct task_struct *child, long request,
635 unsigned long addr, unsigned long data)
636 {
637 int ret;
638 void __user *addrp = (void __user *) addr;
639 void __user *datavp = (void __user *) data;
640 unsigned long __user *datalp = (void __user *) data;
641
642 switch (request) {
643 /* when I and D space are separate, these will need to be fixed. */
644 case PTRACE_PEEKTEXT: /* read word at location addr. */
645 case PTRACE_PEEKDATA:
646 ret = generic_ptrace_peekdata(child, addr, data);
647 break;
648
649 /* Read the word at location addr in the USER area. */
650 case PTRACE_PEEKUSR: {
651 struct pt_regs *regs;
652 union fpureg *fregs;
653 unsigned long tmp = 0;
654
655 regs = task_pt_regs(child);
656 ret = 0; /* Default return value. */
657
658 switch (addr) {
659 case 0 ... 31:
660 tmp = regs->regs[addr];
661 break;
662 case FPR_BASE ... FPR_BASE + 31:
663 if (!tsk_used_math(child)) {
664 /* FP not yet used */
665 tmp = -1;
666 break;
667 }
668 fregs = get_fpu_regs(child);
669
670 #ifdef CONFIG_32BIT
671 if (test_thread_flag(TIF_32BIT_FPREGS)) {
672 /*
673 * The odd registers are actually the high
674 * order bits of the values stored in the even
675 * registers - unless we're using r2k_switch.S.
676 */
677 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
678 addr & 1);
679 break;
680 }
681 #endif
682 tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
683 break;
684 case PC:
685 tmp = regs->cp0_epc;
686 break;
687 case CAUSE:
688 tmp = regs->cp0_cause;
689 break;
690 case BADVADDR:
691 tmp = regs->cp0_badvaddr;
692 break;
693 case MMHI:
694 tmp = regs->hi;
695 break;
696 case MMLO:
697 tmp = regs->lo;
698 break;
699 #ifdef CONFIG_CPU_HAS_SMARTMIPS
700 case ACX:
701 tmp = regs->acx;
702 break;
703 #endif
704 case FPC_CSR:
705 tmp = child->thread.fpu.fcr31;
706 break;
707 case FPC_EIR:
708 /* implementation / version register */
709 tmp = boot_cpu_data.fpu_id;
710 break;
711 case DSP_BASE ... DSP_BASE + 5: {
712 dspreg_t *dregs;
713
714 if (!cpu_has_dsp) {
715 tmp = 0;
716 ret = -EIO;
717 goto out;
718 }
719 dregs = __get_dsp_regs(child);
720 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
721 break;
722 }
723 case DSP_CONTROL:
724 if (!cpu_has_dsp) {
725 tmp = 0;
726 ret = -EIO;
727 goto out;
728 }
729 tmp = child->thread.dsp.dspcontrol;
730 break;
731 default:
732 tmp = 0;
733 ret = -EIO;
734 goto out;
735 }
736 ret = put_user(tmp, datalp);
737 break;
738 }
739
740 /* when I and D space are separate, this will have to be fixed. */
741 case PTRACE_POKETEXT: /* write the word at location addr. */
742 case PTRACE_POKEDATA:
743 ret = generic_ptrace_pokedata(child, addr, data);
744 break;
745
746 case PTRACE_POKEUSR: {
747 struct pt_regs *regs;
748 ret = 0;
749 regs = task_pt_regs(child);
750
751 switch (addr) {
752 case 0 ... 31:
753 regs->regs[addr] = data;
754 break;
755 case FPR_BASE ... FPR_BASE + 31: {
756 union fpureg *fregs = get_fpu_regs(child);
757
758 init_fp_ctx(child);
759 #ifdef CONFIG_32BIT
760 if (test_thread_flag(TIF_32BIT_FPREGS)) {
761 /*
762 * The odd registers are actually the high
763 * order bits of the values stored in the even
764 * registers - unless we're using r2k_switch.S.
765 */
766 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
767 addr & 1, data);
768 break;
769 }
770 #endif
771 set_fpr64(&fregs[addr - FPR_BASE], 0, data);
772 break;
773 }
774 case PC:
775 regs->cp0_epc = data;
776 break;
777 case MMHI:
778 regs->hi = data;
779 break;
780 case MMLO:
781 regs->lo = data;
782 break;
783 #ifdef CONFIG_CPU_HAS_SMARTMIPS
784 case ACX:
785 regs->acx = data;
786 break;
787 #endif
788 case FPC_CSR:
789 init_fp_ctx(child);
790 ptrace_setfcr31(child, data);
791 break;
792 case DSP_BASE ... DSP_BASE + 5: {
793 dspreg_t *dregs;
794
795 if (!cpu_has_dsp) {
796 ret = -EIO;
797 break;
798 }
799
800 dregs = __get_dsp_regs(child);
801 dregs[addr - DSP_BASE] = data;
802 break;
803 }
804 case DSP_CONTROL:
805 if (!cpu_has_dsp) {
806 ret = -EIO;
807 break;
808 }
809 child->thread.dsp.dspcontrol = data;
810 break;
811 default:
812 /* The rest are not allowed. */
813 ret = -EIO;
814 break;
815 }
816 break;
817 }
818
819 case PTRACE_GETREGS:
820 ret = ptrace_getregs(child, datavp);
821 break;
822
823 case PTRACE_SETREGS:
824 ret = ptrace_setregs(child, datavp);
825 break;
826
827 case PTRACE_GETFPREGS:
828 ret = ptrace_getfpregs(child, datavp);
829 break;
830
831 case PTRACE_SETFPREGS:
832 ret = ptrace_setfpregs(child, datavp);
833 break;
834
835 case PTRACE_GET_THREAD_AREA:
836 ret = put_user(task_thread_info(child)->tp_value, datalp);
837 break;
838
839 case PTRACE_GET_WATCH_REGS:
840 ret = ptrace_get_watch_regs(child, addrp);
841 break;
842
843 case PTRACE_SET_WATCH_REGS:
844 ret = ptrace_set_watch_regs(child, addrp);
845 break;
846
847 default:
848 ret = ptrace_request(child, request, addr, data);
849 break;
850 }
851 out:
852 return ret;
853 }
854
855 /*
856 * Notification of system call entry/exit
857 * - triggered by current->work.syscall_trace
858 */
859 asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
860 {
861 user_exit();
862
863 current_thread_info()->syscall = syscall;
864
865 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
866 tracehook_report_syscall_entry(regs))
867 return -1;
868
869 if (secure_computing(NULL) == -1)
870 return -1;
871
872 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
873 trace_sys_enter(regs, regs->regs[2]);
874
875 audit_syscall_entry(syscall, regs->regs[4], regs->regs[5],
876 regs->regs[6], regs->regs[7]);
877 return syscall;
878 }
879
880 /*
881 * Notification of system call entry/exit
882 * - triggered by current->work.syscall_trace
883 */
884 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
885 {
886 /*
887 * We may come here right after calling schedule_user()
888 * or do_notify_resume(), in which case we can be in RCU
889 * user mode.
890 */
891 user_exit();
892
893 audit_syscall_exit(regs);
894
895 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
896 trace_sys_exit(regs, regs->regs[2]);
897
898 if (test_thread_flag(TIF_SYSCALL_TRACE))
899 tracehook_report_syscall_exit(regs, 0);
900
901 user_enter();
902 }
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