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0dcf69194473c6469cbd8ce6cdcdb06499f3b483
[deliverable/linux.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 <asm/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. Don't set the cause bits as
83 * this is currently not handled correctly in FP context restoration
84 * and will cause an oops if a corresponding enable bit is set.
85 */
86 static void ptrace_setfcr31(struct task_struct *child, u32 value)
87 {
88 u32 fcr31;
89 u32 mask;
90
91 value &= ~FPU_CSR_ALL_X;
92 fcr31 = child->thread.fpu.fcr31;
93 mask = boot_cpu_data.fpu_msk31;
94 child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask);
95 }
96
97 /*
98 * Read a general register set. We always use the 64-bit format, even
99 * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
100 * Registers are sign extended to fill the available space.
101 */
102 int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data)
103 {
104 struct pt_regs *regs;
105 int i;
106
107 if (!access_ok(VERIFY_WRITE, data, 38 * 8))
108 return -EIO;
109
110 regs = task_pt_regs(child);
111
112 for (i = 0; i < 32; i++)
113 __put_user((long)regs->regs[i], (__s64 __user *)&data->regs[i]);
114 __put_user((long)regs->lo, (__s64 __user *)&data->lo);
115 __put_user((long)regs->hi, (__s64 __user *)&data->hi);
116 __put_user((long)regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
117 __put_user((long)regs->cp0_badvaddr, (__s64 __user *)&data->cp0_badvaddr);
118 __put_user((long)regs->cp0_status, (__s64 __user *)&data->cp0_status);
119 __put_user((long)regs->cp0_cause, (__s64 __user *)&data->cp0_cause);
120
121 return 0;
122 }
123
124 /*
125 * Write a general register set. As for PTRACE_GETREGS, we always use
126 * the 64-bit format. On a 32-bit kernel only the lower order half
127 * (according to endianness) will be used.
128 */
129 int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data)
130 {
131 struct pt_regs *regs;
132 int i;
133
134 if (!access_ok(VERIFY_READ, data, 38 * 8))
135 return -EIO;
136
137 regs = task_pt_regs(child);
138
139 for (i = 0; i < 32; i++)
140 __get_user(regs->regs[i], (__s64 __user *)&data->regs[i]);
141 __get_user(regs->lo, (__s64 __user *)&data->lo);
142 __get_user(regs->hi, (__s64 __user *)&data->hi);
143 __get_user(regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
144
145 /* badvaddr, status, and cause may not be written. */
146
147 return 0;
148 }
149
150 int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
151 {
152 int i;
153
154 if (!access_ok(VERIFY_WRITE, data, 33 * 8))
155 return -EIO;
156
157 if (tsk_used_math(child)) {
158 union fpureg *fregs = get_fpu_regs(child);
159 for (i = 0; i < 32; i++)
160 __put_user(get_fpr64(&fregs[i], 0),
161 i + (__u64 __user *)data);
162 } else {
163 for (i = 0; i < 32; i++)
164 __put_user((__u64) -1, i + (__u64 __user *) data);
165 }
166
167 __put_user(child->thread.fpu.fcr31, data + 64);
168 __put_user(boot_cpu_data.fpu_id, data + 65);
169
170 return 0;
171 }
172
173 int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
174 {
175 union fpureg *fregs;
176 u64 fpr_val;
177 u32 value;
178 int i;
179
180 if (!access_ok(VERIFY_READ, data, 33 * 8))
181 return -EIO;
182
183 init_fp_ctx(child);
184 fregs = get_fpu_regs(child);
185
186 for (i = 0; i < 32; i++) {
187 __get_user(fpr_val, i + (__u64 __user *)data);
188 set_fpr64(&fregs[i], 0, fpr_val);
189 }
190
191 __get_user(value, data + 64);
192 ptrace_setfcr31(child, value);
193
194 /* FIR may not be written. */
195
196 return 0;
197 }
198
199 int ptrace_get_watch_regs(struct task_struct *child,
200 struct pt_watch_regs __user *addr)
201 {
202 enum pt_watch_style style;
203 int i;
204
205 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
206 return -EIO;
207 if (!access_ok(VERIFY_WRITE, addr, sizeof(struct pt_watch_regs)))
208 return -EIO;
209
210 #ifdef CONFIG_32BIT
211 style = pt_watch_style_mips32;
212 #define WATCH_STYLE mips32
213 #else
214 style = pt_watch_style_mips64;
215 #define WATCH_STYLE mips64
216 #endif
217
218 __put_user(style, &addr->style);
219 __put_user(boot_cpu_data.watch_reg_use_cnt,
220 &addr->WATCH_STYLE.num_valid);
221 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
222 __put_user(child->thread.watch.mips3264.watchlo[i],
223 &addr->WATCH_STYLE.watchlo[i]);
224 __put_user(child->thread.watch.mips3264.watchhi[i] &
225 (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW),
226 &addr->WATCH_STYLE.watchhi[i]);
227 __put_user(boot_cpu_data.watch_reg_masks[i],
228 &addr->WATCH_STYLE.watch_masks[i]);
229 }
230 for (; i < 8; i++) {
231 __put_user(0, &addr->WATCH_STYLE.watchlo[i]);
232 __put_user(0, &addr->WATCH_STYLE.watchhi[i]);
233 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]);
234 }
235
236 return 0;
237 }
238
239 int ptrace_set_watch_regs(struct task_struct *child,
240 struct pt_watch_regs __user *addr)
241 {
242 int i;
243 int watch_active = 0;
244 unsigned long lt[NUM_WATCH_REGS];
245 u16 ht[NUM_WATCH_REGS];
246
247 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
248 return -EIO;
249 if (!access_ok(VERIFY_READ, addr, sizeof(struct pt_watch_regs)))
250 return -EIO;
251 /* Check the values. */
252 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
253 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]);
254 #ifdef CONFIG_32BIT
255 if (lt[i] & __UA_LIMIT)
256 return -EINVAL;
257 #else
258 if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) {
259 if (lt[i] & 0xffffffff80000000UL)
260 return -EINVAL;
261 } else {
262 if (lt[i] & __UA_LIMIT)
263 return -EINVAL;
264 }
265 #endif
266 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
267 if (ht[i] & ~MIPS_WATCHHI_MASK)
268 return -EINVAL;
269 }
270 /* Install them. */
271 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
272 if (lt[i] & MIPS_WATCHLO_IRW)
273 watch_active = 1;
274 child->thread.watch.mips3264.watchlo[i] = lt[i];
275 /* Set the G bit. */
276 child->thread.watch.mips3264.watchhi[i] = ht[i];
277 }
278
279 if (watch_active)
280 set_tsk_thread_flag(child, TIF_LOAD_WATCH);
281 else
282 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
283
284 return 0;
285 }
286
287 /* regset get/set implementations */
288
289 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
290
291 static int gpr32_get(struct task_struct *target,
292 const struct user_regset *regset,
293 unsigned int pos, unsigned int count,
294 void *kbuf, void __user *ubuf)
295 {
296 struct pt_regs *regs = task_pt_regs(target);
297 u32 uregs[ELF_NGREG] = {};
298 unsigned i;
299
300 for (i = MIPS32_EF_R1; i <= MIPS32_EF_R31; i++) {
301 /* k0/k1 are copied as zero. */
302 if (i == MIPS32_EF_R26 || i == MIPS32_EF_R27)
303 continue;
304
305 uregs[i] = regs->regs[i - MIPS32_EF_R0];
306 }
307
308 uregs[MIPS32_EF_LO] = regs->lo;
309 uregs[MIPS32_EF_HI] = regs->hi;
310 uregs[MIPS32_EF_CP0_EPC] = regs->cp0_epc;
311 uregs[MIPS32_EF_CP0_BADVADDR] = regs->cp0_badvaddr;
312 uregs[MIPS32_EF_CP0_STATUS] = regs->cp0_status;
313 uregs[MIPS32_EF_CP0_CAUSE] = regs->cp0_cause;
314
315 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
316 sizeof(uregs));
317 }
318
319 static int gpr32_set(struct task_struct *target,
320 const struct user_regset *regset,
321 unsigned int pos, unsigned int count,
322 const void *kbuf, const void __user *ubuf)
323 {
324 struct pt_regs *regs = task_pt_regs(target);
325 u32 uregs[ELF_NGREG];
326 unsigned start, num_regs, i;
327 int err;
328
329 start = pos / sizeof(u32);
330 num_regs = count / sizeof(u32);
331
332 if (start + num_regs > ELF_NGREG)
333 return -EIO;
334
335 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
336 sizeof(uregs));
337 if (err)
338 return err;
339
340 for (i = start; i < num_regs; i++) {
341 /*
342 * Cast all values to signed here so that if this is a 64-bit
343 * kernel, the supplied 32-bit values will be sign extended.
344 */
345 switch (i) {
346 case MIPS32_EF_R1 ... MIPS32_EF_R25:
347 /* k0/k1 are ignored. */
348 case MIPS32_EF_R28 ... MIPS32_EF_R31:
349 regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i];
350 break;
351 case MIPS32_EF_LO:
352 regs->lo = (s32)uregs[i];
353 break;
354 case MIPS32_EF_HI:
355 regs->hi = (s32)uregs[i];
356 break;
357 case MIPS32_EF_CP0_EPC:
358 regs->cp0_epc = (s32)uregs[i];
359 break;
360 }
361 }
362
363 return 0;
364 }
365
366 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
367
368 #ifdef CONFIG_64BIT
369
370 static int gpr64_get(struct task_struct *target,
371 const struct user_regset *regset,
372 unsigned int pos, unsigned int count,
373 void *kbuf, void __user *ubuf)
374 {
375 struct pt_regs *regs = task_pt_regs(target);
376 u64 uregs[ELF_NGREG] = {};
377 unsigned i;
378
379 for (i = MIPS64_EF_R1; i <= MIPS64_EF_R31; i++) {
380 /* k0/k1 are copied as zero. */
381 if (i == MIPS64_EF_R26 || i == MIPS64_EF_R27)
382 continue;
383
384 uregs[i] = regs->regs[i - MIPS64_EF_R0];
385 }
386
387 uregs[MIPS64_EF_LO] = regs->lo;
388 uregs[MIPS64_EF_HI] = regs->hi;
389 uregs[MIPS64_EF_CP0_EPC] = regs->cp0_epc;
390 uregs[MIPS64_EF_CP0_BADVADDR] = regs->cp0_badvaddr;
391 uregs[MIPS64_EF_CP0_STATUS] = regs->cp0_status;
392 uregs[MIPS64_EF_CP0_CAUSE] = regs->cp0_cause;
393
394 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
395 sizeof(uregs));
396 }
397
398 static int gpr64_set(struct task_struct *target,
399 const struct user_regset *regset,
400 unsigned int pos, unsigned int count,
401 const void *kbuf, const void __user *ubuf)
402 {
403 struct pt_regs *regs = task_pt_regs(target);
404 u64 uregs[ELF_NGREG];
405 unsigned start, num_regs, i;
406 int err;
407
408 start = pos / sizeof(u64);
409 num_regs = count / sizeof(u64);
410
411 if (start + num_regs > ELF_NGREG)
412 return -EIO;
413
414 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
415 sizeof(uregs));
416 if (err)
417 return err;
418
419 for (i = start; i < num_regs; i++) {
420 switch (i) {
421 case MIPS64_EF_R1 ... MIPS64_EF_R25:
422 /* k0/k1 are ignored. */
423 case MIPS64_EF_R28 ... MIPS64_EF_R31:
424 regs->regs[i - MIPS64_EF_R0] = uregs[i];
425 break;
426 case MIPS64_EF_LO:
427 regs->lo = uregs[i];
428 break;
429 case MIPS64_EF_HI:
430 regs->hi = uregs[i];
431 break;
432 case MIPS64_EF_CP0_EPC:
433 regs->cp0_epc = uregs[i];
434 break;
435 }
436 }
437
438 return 0;
439 }
440
441 #endif /* CONFIG_64BIT */
442
443 static int fpr_get(struct task_struct *target,
444 const struct user_regset *regset,
445 unsigned int pos, unsigned int count,
446 void *kbuf, void __user *ubuf)
447 {
448 unsigned i;
449 int err;
450 u64 fpr_val;
451
452 /* XXX fcr31 */
453
454 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
455 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
456 &target->thread.fpu,
457 0, sizeof(elf_fpregset_t));
458
459 for (i = 0; i < NUM_FPU_REGS; i++) {
460 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
461 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
462 &fpr_val, i * sizeof(elf_fpreg_t),
463 (i + 1) * sizeof(elf_fpreg_t));
464 if (err)
465 return err;
466 }
467
468 return 0;
469 }
470
471 static int fpr_set(struct task_struct *target,
472 const struct user_regset *regset,
473 unsigned int pos, unsigned int count,
474 const void *kbuf, const void __user *ubuf)
475 {
476 unsigned i;
477 int err;
478 u64 fpr_val;
479
480 /* XXX fcr31 */
481
482 init_fp_ctx(target);
483
484 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
485 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
486 &target->thread.fpu,
487 0, sizeof(elf_fpregset_t));
488
489 for (i = 0; i < NUM_FPU_REGS; i++) {
490 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
491 &fpr_val, i * sizeof(elf_fpreg_t),
492 (i + 1) * sizeof(elf_fpreg_t));
493 if (err)
494 return err;
495 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
496 }
497
498 return 0;
499 }
500
501 enum mips_regset {
502 REGSET_GPR,
503 REGSET_FPR,
504 };
505
506 struct pt_regs_offset {
507 const char *name;
508 int offset;
509 };
510
511 #define REG_OFFSET_NAME(reg, r) { \
512 .name = #reg, \
513 .offset = offsetof(struct pt_regs, r) \
514 }
515
516 #define REG_OFFSET_END { \
517 .name = NULL, \
518 .offset = 0 \
519 }
520
521 static const struct pt_regs_offset regoffset_table[] = {
522 REG_OFFSET_NAME(r0, regs[0]),
523 REG_OFFSET_NAME(r1, regs[1]),
524 REG_OFFSET_NAME(r2, regs[2]),
525 REG_OFFSET_NAME(r3, regs[3]),
526 REG_OFFSET_NAME(r4, regs[4]),
527 REG_OFFSET_NAME(r5, regs[5]),
528 REG_OFFSET_NAME(r6, regs[6]),
529 REG_OFFSET_NAME(r7, regs[7]),
530 REG_OFFSET_NAME(r8, regs[8]),
531 REG_OFFSET_NAME(r9, regs[9]),
532 REG_OFFSET_NAME(r10, regs[10]),
533 REG_OFFSET_NAME(r11, regs[11]),
534 REG_OFFSET_NAME(r12, regs[12]),
535 REG_OFFSET_NAME(r13, regs[13]),
536 REG_OFFSET_NAME(r14, regs[14]),
537 REG_OFFSET_NAME(r15, regs[15]),
538 REG_OFFSET_NAME(r16, regs[16]),
539 REG_OFFSET_NAME(r17, regs[17]),
540 REG_OFFSET_NAME(r18, regs[18]),
541 REG_OFFSET_NAME(r19, regs[19]),
542 REG_OFFSET_NAME(r20, regs[20]),
543 REG_OFFSET_NAME(r21, regs[21]),
544 REG_OFFSET_NAME(r22, regs[22]),
545 REG_OFFSET_NAME(r23, regs[23]),
546 REG_OFFSET_NAME(r24, regs[24]),
547 REG_OFFSET_NAME(r25, regs[25]),
548 REG_OFFSET_NAME(r26, regs[26]),
549 REG_OFFSET_NAME(r27, regs[27]),
550 REG_OFFSET_NAME(r28, regs[28]),
551 REG_OFFSET_NAME(r29, regs[29]),
552 REG_OFFSET_NAME(r30, regs[30]),
553 REG_OFFSET_NAME(r31, regs[31]),
554 REG_OFFSET_NAME(c0_status, cp0_status),
555 REG_OFFSET_NAME(hi, hi),
556 REG_OFFSET_NAME(lo, lo),
557 #ifdef CONFIG_CPU_HAS_SMARTMIPS
558 REG_OFFSET_NAME(acx, acx),
559 #endif
560 REG_OFFSET_NAME(c0_badvaddr, cp0_badvaddr),
561 REG_OFFSET_NAME(c0_cause, cp0_cause),
562 REG_OFFSET_NAME(c0_epc, cp0_epc),
563 #ifdef CONFIG_CPU_CAVIUM_OCTEON
564 REG_OFFSET_NAME(mpl0, mpl[0]),
565 REG_OFFSET_NAME(mpl1, mpl[1]),
566 REG_OFFSET_NAME(mpl2, mpl[2]),
567 REG_OFFSET_NAME(mtp0, mtp[0]),
568 REG_OFFSET_NAME(mtp1, mtp[1]),
569 REG_OFFSET_NAME(mtp2, mtp[2]),
570 #endif
571 REG_OFFSET_END,
572 };
573
574 /**
575 * regs_query_register_offset() - query register offset from its name
576 * @name: the name of a register
577 *
578 * regs_query_register_offset() returns the offset of a register in struct
579 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
580 */
581 int regs_query_register_offset(const char *name)
582 {
583 const struct pt_regs_offset *roff;
584 for (roff = regoffset_table; roff->name != NULL; roff++)
585 if (!strcmp(roff->name, name))
586 return roff->offset;
587 return -EINVAL;
588 }
589
590 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
591
592 static const struct user_regset mips_regsets[] = {
593 [REGSET_GPR] = {
594 .core_note_type = NT_PRSTATUS,
595 .n = ELF_NGREG,
596 .size = sizeof(unsigned int),
597 .align = sizeof(unsigned int),
598 .get = gpr32_get,
599 .set = gpr32_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_mips_view = {
612 .name = "mips",
613 .e_machine = ELF_ARCH,
614 .ei_osabi = ELF_OSABI,
615 .regsets = mips_regsets,
616 .n = ARRAY_SIZE(mips_regsets),
617 };
618
619 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
620
621 #ifdef CONFIG_64BIT
622
623 static const struct user_regset mips64_regsets[] = {
624 [REGSET_GPR] = {
625 .core_note_type = NT_PRSTATUS,
626 .n = ELF_NGREG,
627 .size = sizeof(unsigned long),
628 .align = sizeof(unsigned long),
629 .get = gpr64_get,
630 .set = gpr64_set,
631 },
632 [REGSET_FPR] = {
633 .core_note_type = NT_PRFPREG,
634 .n = ELF_NFPREG,
635 .size = sizeof(elf_fpreg_t),
636 .align = sizeof(elf_fpreg_t),
637 .get = fpr_get,
638 .set = fpr_set,
639 },
640 };
641
642 static const struct user_regset_view user_mips64_view = {
643 .name = "mips64",
644 .e_machine = ELF_ARCH,
645 .ei_osabi = ELF_OSABI,
646 .regsets = mips64_regsets,
647 .n = ARRAY_SIZE(mips64_regsets),
648 };
649
650 #endif /* CONFIG_64BIT */
651
652 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
653 {
654 #ifdef CONFIG_32BIT
655 return &user_mips_view;
656 #else
657 #ifdef CONFIG_MIPS32_O32
658 if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
659 return &user_mips_view;
660 #endif
661 return &user_mips64_view;
662 #endif
663 }
664
665 long arch_ptrace(struct task_struct *child, long request,
666 unsigned long addr, unsigned long data)
667 {
668 int ret;
669 void __user *addrp = (void __user *) addr;
670 void __user *datavp = (void __user *) data;
671 unsigned long __user *datalp = (void __user *) data;
672
673 switch (request) {
674 /* when I and D space are separate, these will need to be fixed. */
675 case PTRACE_PEEKTEXT: /* read word at location addr. */
676 case PTRACE_PEEKDATA:
677 ret = generic_ptrace_peekdata(child, addr, data);
678 break;
679
680 /* Read the word at location addr in the USER area. */
681 case PTRACE_PEEKUSR: {
682 struct pt_regs *regs;
683 union fpureg *fregs;
684 unsigned long tmp = 0;
685
686 regs = task_pt_regs(child);
687 ret = 0; /* Default return value. */
688
689 switch (addr) {
690 case 0 ... 31:
691 tmp = regs->regs[addr];
692 break;
693 case FPR_BASE ... FPR_BASE + 31:
694 if (!tsk_used_math(child)) {
695 /* FP not yet used */
696 tmp = -1;
697 break;
698 }
699 fregs = get_fpu_regs(child);
700
701 #ifdef CONFIG_32BIT
702 if (test_thread_flag(TIF_32BIT_FPREGS)) {
703 /*
704 * The odd registers are actually the high
705 * order bits of the values stored in the even
706 * registers - unless we're using r2k_switch.S.
707 */
708 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
709 addr & 1);
710 break;
711 }
712 #endif
713 tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
714 break;
715 case PC:
716 tmp = regs->cp0_epc;
717 break;
718 case CAUSE:
719 tmp = regs->cp0_cause;
720 break;
721 case BADVADDR:
722 tmp = regs->cp0_badvaddr;
723 break;
724 case MMHI:
725 tmp = regs->hi;
726 break;
727 case MMLO:
728 tmp = regs->lo;
729 break;
730 #ifdef CONFIG_CPU_HAS_SMARTMIPS
731 case ACX:
732 tmp = regs->acx;
733 break;
734 #endif
735 case FPC_CSR:
736 tmp = child->thread.fpu.fcr31;
737 break;
738 case FPC_EIR:
739 /* implementation / version register */
740 tmp = boot_cpu_data.fpu_id;
741 break;
742 case DSP_BASE ... DSP_BASE + 5: {
743 dspreg_t *dregs;
744
745 if (!cpu_has_dsp) {
746 tmp = 0;
747 ret = -EIO;
748 goto out;
749 }
750 dregs = __get_dsp_regs(child);
751 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
752 break;
753 }
754 case DSP_CONTROL:
755 if (!cpu_has_dsp) {
756 tmp = 0;
757 ret = -EIO;
758 goto out;
759 }
760 tmp = child->thread.dsp.dspcontrol;
761 break;
762 default:
763 tmp = 0;
764 ret = -EIO;
765 goto out;
766 }
767 ret = put_user(tmp, datalp);
768 break;
769 }
770
771 /* when I and D space are separate, this will have to be fixed. */
772 case PTRACE_POKETEXT: /* write the word at location addr. */
773 case PTRACE_POKEDATA:
774 ret = generic_ptrace_pokedata(child, addr, data);
775 break;
776
777 case PTRACE_POKEUSR: {
778 struct pt_regs *regs;
779 ret = 0;
780 regs = task_pt_regs(child);
781
782 switch (addr) {
783 case 0 ... 31:
784 regs->regs[addr] = data;
785 break;
786 case FPR_BASE ... FPR_BASE + 31: {
787 union fpureg *fregs = get_fpu_regs(child);
788
789 init_fp_ctx(child);
790 #ifdef CONFIG_32BIT
791 if (test_thread_flag(TIF_32BIT_FPREGS)) {
792 /*
793 * The odd registers are actually the high
794 * order bits of the values stored in the even
795 * registers - unless we're using r2k_switch.S.
796 */
797 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
798 addr & 1, data);
799 break;
800 }
801 #endif
802 set_fpr64(&fregs[addr - FPR_BASE], 0, data);
803 break;
804 }
805 case PC:
806 regs->cp0_epc = data;
807 break;
808 case MMHI:
809 regs->hi = data;
810 break;
811 case MMLO:
812 regs->lo = data;
813 break;
814 #ifdef CONFIG_CPU_HAS_SMARTMIPS
815 case ACX:
816 regs->acx = data;
817 break;
818 #endif
819 case FPC_CSR:
820 ptrace_setfcr31(child, data);
821 break;
822 case DSP_BASE ... DSP_BASE + 5: {
823 dspreg_t *dregs;
824
825 if (!cpu_has_dsp) {
826 ret = -EIO;
827 break;
828 }
829
830 dregs = __get_dsp_regs(child);
831 dregs[addr - DSP_BASE] = data;
832 break;
833 }
834 case DSP_CONTROL:
835 if (!cpu_has_dsp) {
836 ret = -EIO;
837 break;
838 }
839 child->thread.dsp.dspcontrol = data;
840 break;
841 default:
842 /* The rest are not allowed. */
843 ret = -EIO;
844 break;
845 }
846 break;
847 }
848
849 case PTRACE_GETREGS:
850 ret = ptrace_getregs(child, datavp);
851 break;
852
853 case PTRACE_SETREGS:
854 ret = ptrace_setregs(child, datavp);
855 break;
856
857 case PTRACE_GETFPREGS:
858 ret = ptrace_getfpregs(child, datavp);
859 break;
860
861 case PTRACE_SETFPREGS:
862 ret = ptrace_setfpregs(child, datavp);
863 break;
864
865 case PTRACE_GET_THREAD_AREA:
866 ret = put_user(task_thread_info(child)->tp_value, datalp);
867 break;
868
869 case PTRACE_GET_WATCH_REGS:
870 ret = ptrace_get_watch_regs(child, addrp);
871 break;
872
873 case PTRACE_SET_WATCH_REGS:
874 ret = ptrace_set_watch_regs(child, addrp);
875 break;
876
877 default:
878 ret = ptrace_request(child, request, addr, data);
879 break;
880 }
881 out:
882 return ret;
883 }
884
885 /*
886 * Notification of system call entry/exit
887 * - triggered by current->work.syscall_trace
888 */
889 asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
890 {
891 long ret = 0;
892 user_exit();
893
894 current_thread_info()->syscall = syscall;
895
896 if (secure_computing() == -1)
897 return -1;
898
899 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
900 tracehook_report_syscall_entry(regs))
901 ret = -1;
902
903 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
904 trace_sys_enter(regs, regs->regs[2]);
905
906 audit_syscall_entry(syscall, regs->regs[4], regs->regs[5],
907 regs->regs[6], regs->regs[7]);
908 return syscall;
909 }
910
911 /*
912 * Notification of system call entry/exit
913 * - triggered by current->work.syscall_trace
914 */
915 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
916 {
917 /*
918 * We may come here right after calling schedule_user()
919 * or do_notify_resume(), in which case we can be in RCU
920 * user mode.
921 */
922 user_exit();
923
924 audit_syscall_exit(regs);
925
926 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
927 trace_sys_exit(regs, regs->regs[2]);
928
929 if (test_thread_flag(TIF_SYSCALL_TRACE))
930 tracehook_report_syscall_exit(regs, 0);
931
932 user_enter();
933 }
Linux kernel - Deliverables
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