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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(child, 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(child, 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(child, TIF_LOAD_WATCH);
207 else
208 clear_tsk_thread_flag(child, 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(&to, uregs, 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, &count, &kbuf, &ubuf, uregs, 0,
310 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(&to, dspregs, 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, &count, &kbuf, &ubuf, dspregs, 0,
808 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 for (roff = regoffset_table; roff->name != NULL; roff++)
927 if (!strcmp(roff->name, name))
928 return roff->offset;
929 return -EINVAL;
930}
931
932#if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
933
934static const struct user_regset mips_regsets[] = {
935 [REGSET_GPR] = {
936 .core_note_type = NT_PRSTATUS,
937 .n = ELF_NGREG,
938 .size = sizeof(unsigned int),
939 .align = sizeof(unsigned int),
940 .regset_get = gpr32_get,
941 .set = gpr32_set,
942 },
943 [REGSET_DSP] = {
944 .core_note_type = NT_MIPS_DSP,
945 .n = NUM_DSP_REGS + 1,
946 .size = sizeof(u32),
947 .align = sizeof(u32),
948 .regset_get = dsp32_get,
949 .set = dsp32_set,
950 .active = dsp_active,
951 },
952#ifdef CONFIG_MIPS_FP_SUPPORT
953 [REGSET_FPR] = {
954 .core_note_type = NT_PRFPREG,
955 .n = ELF_NFPREG,
956 .size = sizeof(elf_fpreg_t),
957 .align = sizeof(elf_fpreg_t),
958 .regset_get = fpr_get,
959 .set = fpr_set,
960 },
961 [REGSET_FP_MODE] = {
962 .core_note_type = NT_MIPS_FP_MODE,
963 .n = 1,
964 .size = sizeof(int),
965 .align = sizeof(int),
966 .regset_get = fp_mode_get,
967 .set = fp_mode_set,
968 },
969#endif
970#ifdef CONFIG_CPU_HAS_MSA
971 [REGSET_MSA] = {
972 .core_note_type = NT_MIPS_MSA,
973 .n = NUM_FPU_REGS + 1,
974 .size = 16,
975 .align = 16,
976 .regset_get = msa_get,
977 .set = msa_set,
978 },
979#endif
980};
981
982static const struct user_regset_view user_mips_view = {
983 .name = "mips",
984 .e_machine = ELF_ARCH,
985 .ei_osabi = ELF_OSABI,
986 .regsets = mips_regsets,
987 .n = ARRAY_SIZE(mips_regsets),
988};
989
990#endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
991
992#ifdef CONFIG_64BIT
993
994static const struct user_regset mips64_regsets[] = {
995 [REGSET_GPR] = {
996 .core_note_type = NT_PRSTATUS,
997 .n = ELF_NGREG,
998 .size = sizeof(unsigned long),
999 .align = sizeof(unsigned long),
1000 .regset_get = gpr64_get,
1001 .set = gpr64_set,
1002 },
1003 [REGSET_DSP] = {
1004 .core_note_type = NT_MIPS_DSP,
1005 .n = NUM_DSP_REGS + 1,
1006 .size = sizeof(u64),
1007 .align = sizeof(u64),
1008 .regset_get = dsp64_get,
1009 .set = dsp64_set,
1010 .active = dsp_active,
1011 },
1012#ifdef CONFIG_MIPS_FP_SUPPORT
1013 [REGSET_FP_MODE] = {
1014 .core_note_type = NT_MIPS_FP_MODE,
1015 .n = 1,
1016 .size = sizeof(int),
1017 .align = sizeof(int),
1018 .regset_get = fp_mode_get,
1019 .set = fp_mode_set,
1020 },
1021 [REGSET_FPR] = {
1022 .core_note_type = NT_PRFPREG,
1023 .n = ELF_NFPREG,
1024 .size = sizeof(elf_fpreg_t),
1025 .align = sizeof(elf_fpreg_t),
1026 .regset_get = fpr_get,
1027 .set = fpr_set,
1028 },
1029#endif
1030#ifdef CONFIG_CPU_HAS_MSA
1031 [REGSET_MSA] = {
1032 .core_note_type = NT_MIPS_MSA,
1033 .n = NUM_FPU_REGS + 1,
1034 .size = 16,
1035 .align = 16,
1036 .regset_get = msa_get,
1037 .set = msa_set,
1038 },
1039#endif
1040};
1041
1042static const struct user_regset_view user_mips64_view = {
1043 .name = "mips64",
1044 .e_machine = ELF_ARCH,
1045 .ei_osabi = ELF_OSABI,
1046 .regsets = mips64_regsets,
1047 .n = ARRAY_SIZE(mips64_regsets),
1048};
1049
1050#ifdef CONFIG_MIPS32_N32
1051
1052static const struct user_regset_view user_mipsn32_view = {
1053 .name = "mipsn32",
1054 .e_flags = EF_MIPS_ABI2,
1055 .e_machine = ELF_ARCH,
1056 .ei_osabi = ELF_OSABI,
1057 .regsets = mips64_regsets,
1058 .n = ARRAY_SIZE(mips64_regsets),
1059};
1060
1061#endif /* CONFIG_MIPS32_N32 */
1062
1063#endif /* CONFIG_64BIT */
1064
1065const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1066{
1067#ifdef CONFIG_32BIT
1068 return &user_mips_view;
1069#else
1070#ifdef CONFIG_MIPS32_O32
1071 if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
1072 return &user_mips_view;
1073#endif
1074#ifdef CONFIG_MIPS32_N32
1075 if (test_tsk_thread_flag(task, TIF_32BIT_ADDR))
1076 return &user_mipsn32_view;
1077#endif
1078 return &user_mips64_view;
1079#endif
1080}
1081
1082long arch_ptrace(struct task_struct *child, long request,
1083 unsigned long addr, unsigned long data)
1084{
1085 int ret;
1086 void __user *addrp = (void __user *) addr;
1087 void __user *datavp = (void __user *) data;
1088 unsigned long __user *datalp = (void __user *) data;
1089
1090 switch (request) {
1091 /* when I and D space are separate, these will need to be fixed. */
1092 case PTRACE_PEEKTEXT: /* read word at location addr. */
1093 case PTRACE_PEEKDATA:
1094 ret = generic_ptrace_peekdata(child, addr, data);
1095 break;
1096
1097 /* Read the word at location addr in the USER area. */
1098 case PTRACE_PEEKUSR: {
1099 struct pt_regs *regs;
1100 unsigned long tmp = 0;
1101
1102 regs = task_pt_regs(child);
1103 ret = 0; /* Default return value. */
1104
1105 switch (addr) {
1106 case 0 ... 31:
1107 tmp = regs->regs[addr];
1108 break;
1109#ifdef CONFIG_MIPS_FP_SUPPORT
1110 case FPR_BASE ... FPR_BASE + 31: {
1111 union fpureg *fregs;
1112
1113 if (!tsk_used_math(child)) {
1114 /* FP not yet used */
1115 tmp = -1;
1116 break;
1117 }
1118 fregs = get_fpu_regs(child);
1119
1120#ifdef CONFIG_32BIT
1121 if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
1122 /*
1123 * The odd registers are actually the high
1124 * order bits of the values stored in the even
1125 * registers.
1126 */
1127 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
1128 addr & 1);
1129 break;
1130 }
1131#endif
1132 tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
1133 break;
1134 }
1135 case FPC_CSR:
1136 tmp = child->thread.fpu.fcr31;
1137 break;
1138 case FPC_EIR:
1139 /* implementation / version register */
1140 tmp = boot_cpu_data.fpu_id;
1141 break;
1142#endif
1143 case PC:
1144 tmp = regs->cp0_epc;
1145 break;
1146 case CAUSE:
1147 tmp = regs->cp0_cause;
1148 break;
1149 case BADVADDR:
1150 tmp = regs->cp0_badvaddr;
1151 break;
1152 case MMHI:
1153 tmp = regs->hi;
1154 break;
1155 case MMLO:
1156 tmp = regs->lo;
1157 break;
1158#ifdef CONFIG_CPU_HAS_SMARTMIPS
1159 case ACX:
1160 tmp = regs->acx;
1161 break;
1162#endif
1163 case DSP_BASE ... DSP_BASE + 5: {
1164 dspreg_t *dregs;
1165
1166 if (!cpu_has_dsp) {
1167 tmp = 0;
1168 ret = -EIO;
1169 goto out;
1170 }
1171 dregs = __get_dsp_regs(child);
1172 tmp = dregs[addr - DSP_BASE];
1173 break;
1174 }
1175 case DSP_CONTROL:
1176 if (!cpu_has_dsp) {
1177 tmp = 0;
1178 ret = -EIO;
1179 goto out;
1180 }
1181 tmp = child->thread.dsp.dspcontrol;
1182 break;
1183 default:
1184 tmp = 0;
1185 ret = -EIO;
1186 goto out;
1187 }
1188 ret = put_user(tmp, datalp);
1189 break;
1190 }
1191
1192 /* when I and D space are separate, this will have to be fixed. */
1193 case PTRACE_POKETEXT: /* write the word at location addr. */
1194 case PTRACE_POKEDATA:
1195 ret = generic_ptrace_pokedata(child, addr, data);
1196 break;
1197
1198 case PTRACE_POKEUSR: {
1199 struct pt_regs *regs;
1200 ret = 0;
1201 regs = task_pt_regs(child);
1202
1203 switch (addr) {
1204 case 0 ... 31:
1205 regs->regs[addr] = data;
1206 /* System call number may have been changed */
1207 if (addr == 2)
1208 mips_syscall_update_nr(child, regs);
1209 else if (addr == 4 &&
1210 mips_syscall_is_indirect(child, regs))
1211 mips_syscall_update_nr(child, regs);
1212 break;
1213#ifdef CONFIG_MIPS_FP_SUPPORT
1214 case FPR_BASE ... FPR_BASE + 31: {
1215 union fpureg *fregs = get_fpu_regs(child);
1216
1217 init_fp_ctx(child);
1218#ifdef CONFIG_32BIT
1219 if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
1220 /*
1221 * The odd registers are actually the high
1222 * order bits of the values stored in the even
1223 * registers.
1224 */
1225 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
1226 addr & 1, data);
1227 break;
1228 }
1229#endif
1230 set_fpr64(&fregs[addr - FPR_BASE], 0, data);
1231 break;
1232 }
1233 case FPC_CSR:
1234 init_fp_ctx(child);
1235 ptrace_setfcr31(child, data);
1236 break;
1237#endif
1238 case PC:
1239 regs->cp0_epc = data;
1240 break;
1241 case MMHI:
1242 regs->hi = data;
1243 break;
1244 case MMLO:
1245 regs->lo = data;
1246 break;
1247#ifdef CONFIG_CPU_HAS_SMARTMIPS
1248 case ACX:
1249 regs->acx = data;
1250 break;
1251#endif
1252 case DSP_BASE ... DSP_BASE + 5: {
1253 dspreg_t *dregs;
1254
1255 if (!cpu_has_dsp) {
1256 ret = -EIO;
1257 break;
1258 }
1259
1260 dregs = __get_dsp_regs(child);
1261 dregs[addr - DSP_BASE] = data;
1262 break;
1263 }
1264 case DSP_CONTROL:
1265 if (!cpu_has_dsp) {
1266 ret = -EIO;
1267 break;
1268 }
1269 child->thread.dsp.dspcontrol = data;
1270 break;
1271 default:
1272 /* The rest are not allowed. */
1273 ret = -EIO;
1274 break;
1275 }
1276 break;
1277 }
1278
1279 case PTRACE_GETREGS:
1280 ret = ptrace_getregs(child, datavp);
1281 break;
1282
1283 case PTRACE_SETREGS:
1284 ret = ptrace_setregs(child, datavp);
1285 break;
1286
1287#ifdef CONFIG_MIPS_FP_SUPPORT
1288 case PTRACE_GETFPREGS:
1289 ret = ptrace_getfpregs(child, datavp);
1290 break;
1291
1292 case PTRACE_SETFPREGS:
1293 ret = ptrace_setfpregs(child, datavp);
1294 break;
1295#endif
1296 case PTRACE_GET_THREAD_AREA:
1297 ret = put_user(task_thread_info(child)->tp_value, datalp);
1298 break;
1299
1300 case PTRACE_GET_WATCH_REGS:
1301 ret = ptrace_get_watch_regs(child, addrp);
1302 break;
1303
1304 case PTRACE_SET_WATCH_REGS:
1305 ret = ptrace_set_watch_regs(child, addrp);
1306 break;
1307
1308 default:
1309 ret = ptrace_request(child, request, addr, data);
1310 break;
1311 }
1312 out:
1313 return ret;
1314}
1315
1316/*
1317 * Notification of system call entry/exit
1318 * - triggered by current->work.syscall_trace
1319 */
1320asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
1321{
1322 user_exit();
1323
1324 current_thread_info()->syscall = syscall;
1325
1326 if (test_thread_flag(TIF_SYSCALL_TRACE)) {
1327 if (ptrace_report_syscall_entry(regs))
1328 return -1;
1329 syscall = current_thread_info()->syscall;
1330 }
1331
1332#ifdef CONFIG_SECCOMP
1333 if (unlikely(test_thread_flag(TIF_SECCOMP))) {
1334 int ret, i;
1335 struct seccomp_data sd;
1336 unsigned long args[6];
1337
1338 sd.nr = syscall;
1339 sd.arch = syscall_get_arch(current);
1340 syscall_get_arguments(current, regs, args);
1341 for (i = 0; i < 6; i++)
1342 sd.args[i] = args[i];
1343 sd.instruction_pointer = KSTK_EIP(current);
1344
1345 ret = __secure_computing(&sd);
1346 if (ret == -1)
1347 return ret;
1348 syscall = current_thread_info()->syscall;
1349 }
1350#endif
1351
1352 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1353 trace_sys_enter(regs, regs->regs[2]);
1354
1355 audit_syscall_entry(syscall, regs->regs[4], regs->regs[5],
1356 regs->regs[6], regs->regs[7]);
1357
1358 /*
1359 * Negative syscall numbers are mistaken for rejected syscalls, but
1360 * won't have had the return value set appropriately, so we do so now.
1361 */
1362 if (syscall < 0)
1363 syscall_set_return_value(current, regs, -ENOSYS, 0);
1364 return syscall;
1365}
1366
1367/*
1368 * Notification of system call entry/exit
1369 * - triggered by current->work.syscall_trace
1370 */
1371asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1372{
1373 /*
1374 * We may come here right after calling schedule_user()
1375 * or do_notify_resume(), in which case we can be in RCU
1376 * user mode.
1377 */
1378 user_exit();
1379
1380 audit_syscall_exit(regs);
1381
1382 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1383 trace_sys_exit(regs, regs_return_value(regs));
1384
1385 if (test_thread_flag(TIF_SYSCALL_TRACE))
1386 ptrace_report_syscall_exit(regs, 0);
1387
1388 user_enter();
1389}
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
51static 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 */
75void 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 */
86static 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 */
101int 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 */
128int 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
149int 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
172int 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
198int 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
238int 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
290static 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 unsigned i;
298
299 for (i = MIPS32_EF_R1; i <= MIPS32_EF_R31; i++) {
300 /* k0/k1 are copied as zero. */
301 if (i == MIPS32_EF_R26 || i == MIPS32_EF_R27)
302 continue;
303
304 uregs[i] = regs->regs[i - MIPS32_EF_R0];
305 }
306
307 uregs[MIPS32_EF_LO] = regs->lo;
308 uregs[MIPS32_EF_HI] = regs->hi;
309 uregs[MIPS32_EF_CP0_EPC] = regs->cp0_epc;
310 uregs[MIPS32_EF_CP0_BADVADDR] = regs->cp0_badvaddr;
311 uregs[MIPS32_EF_CP0_STATUS] = regs->cp0_status;
312 uregs[MIPS32_EF_CP0_CAUSE] = regs->cp0_cause;
313
314 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
315 sizeof(uregs));
316}
317
318static int gpr32_set(struct task_struct *target,
319 const struct user_regset *regset,
320 unsigned int pos, unsigned int count,
321 const void *kbuf, const void __user *ubuf)
322{
323 struct pt_regs *regs = task_pt_regs(target);
324 u32 uregs[ELF_NGREG];
325 unsigned start, num_regs, i;
326 int err;
327
328 start = pos / sizeof(u32);
329 num_regs = count / sizeof(u32);
330
331 if (start + num_regs > ELF_NGREG)
332 return -EIO;
333
334 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
335 sizeof(uregs));
336 if (err)
337 return err;
338
339 for (i = start; i < num_regs; i++) {
340 /*
341 * Cast all values to signed here so that if this is a 64-bit
342 * kernel, the supplied 32-bit values will be sign extended.
343 */
344 switch (i) {
345 case MIPS32_EF_R1 ... MIPS32_EF_R25:
346 /* k0/k1 are ignored. */
347 case MIPS32_EF_R28 ... MIPS32_EF_R31:
348 regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i];
349 break;
350 case MIPS32_EF_LO:
351 regs->lo = (s32)uregs[i];
352 break;
353 case MIPS32_EF_HI:
354 regs->hi = (s32)uregs[i];
355 break;
356 case MIPS32_EF_CP0_EPC:
357 regs->cp0_epc = (s32)uregs[i];
358 break;
359 }
360 }
361
362 return 0;
363}
364
365#endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
366
367#ifdef CONFIG_64BIT
368
369static int gpr64_get(struct task_struct *target,
370 const struct user_regset *regset,
371 unsigned int pos, unsigned int count,
372 void *kbuf, void __user *ubuf)
373{
374 struct pt_regs *regs = task_pt_regs(target);
375 u64 uregs[ELF_NGREG] = {};
376 unsigned i;
377
378 for (i = MIPS64_EF_R1; i <= MIPS64_EF_R31; i++) {
379 /* k0/k1 are copied as zero. */
380 if (i == MIPS64_EF_R26 || i == MIPS64_EF_R27)
381 continue;
382
383 uregs[i] = regs->regs[i - MIPS64_EF_R0];
384 }
385
386 uregs[MIPS64_EF_LO] = regs->lo;
387 uregs[MIPS64_EF_HI] = regs->hi;
388 uregs[MIPS64_EF_CP0_EPC] = regs->cp0_epc;
389 uregs[MIPS64_EF_CP0_BADVADDR] = regs->cp0_badvaddr;
390 uregs[MIPS64_EF_CP0_STATUS] = regs->cp0_status;
391 uregs[MIPS64_EF_CP0_CAUSE] = regs->cp0_cause;
392
393 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
394 sizeof(uregs));
395}
396
397static int gpr64_set(struct task_struct *target,
398 const struct user_regset *regset,
399 unsigned int pos, unsigned int count,
400 const void *kbuf, const void __user *ubuf)
401{
402 struct pt_regs *regs = task_pt_regs(target);
403 u64 uregs[ELF_NGREG];
404 unsigned start, num_regs, i;
405 int err;
406
407 start = pos / sizeof(u64);
408 num_regs = count / sizeof(u64);
409
410 if (start + num_regs > ELF_NGREG)
411 return -EIO;
412
413 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
414 sizeof(uregs));
415 if (err)
416 return err;
417
418 for (i = start; i < num_regs; i++) {
419 switch (i) {
420 case MIPS64_EF_R1 ... MIPS64_EF_R25:
421 /* k0/k1 are ignored. */
422 case MIPS64_EF_R28 ... MIPS64_EF_R31:
423 regs->regs[i - MIPS64_EF_R0] = uregs[i];
424 break;
425 case MIPS64_EF_LO:
426 regs->lo = uregs[i];
427 break;
428 case MIPS64_EF_HI:
429 regs->hi = uregs[i];
430 break;
431 case MIPS64_EF_CP0_EPC:
432 regs->cp0_epc = uregs[i];
433 break;
434 }
435 }
436
437 return 0;
438}
439
440#endif /* CONFIG_64BIT */
441
442static int fpr_get(struct task_struct *target,
443 const struct user_regset *regset,
444 unsigned int pos, unsigned int count,
445 void *kbuf, void __user *ubuf)
446{
447 unsigned i;
448 int err;
449 u64 fpr_val;
450
451 /* XXX fcr31 */
452
453 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
454 return user_regset_copyout(&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 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
460 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
461 &fpr_val, i * sizeof(elf_fpreg_t),
462 (i + 1) * sizeof(elf_fpreg_t));
463 if (err)
464 return err;
465 }
466
467 return 0;
468}
469
470static int fpr_set(struct task_struct *target,
471 const struct user_regset *regset,
472 unsigned int pos, unsigned int count,
473 const void *kbuf, const void __user *ubuf)
474{
475 unsigned i;
476 int err;
477 u64 fpr_val;
478
479 /* XXX fcr31 */
480
481 init_fp_ctx(target);
482
483 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
484 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
485 &target->thread.fpu,
486 0, sizeof(elf_fpregset_t));
487
488 BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
489 for (i = 0; i < NUM_FPU_REGS && count >= sizeof(elf_fpreg_t); 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
501enum mips_regset {
502 REGSET_GPR,
503 REGSET_FPR,
504};
505
506struct 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
521static 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 */
581int 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
592static 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
611static 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
623static 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
642static 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
652const 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
665long 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 init_fp_ctx(child);
821 ptrace_setfcr31(child, data);
822 break;
823 case DSP_BASE ... DSP_BASE + 5: {
824 dspreg_t *dregs;
825
826 if (!cpu_has_dsp) {
827 ret = -EIO;
828 break;
829 }
830
831 dregs = __get_dsp_regs(child);
832 dregs[addr - DSP_BASE] = data;
833 break;
834 }
835 case DSP_CONTROL:
836 if (!cpu_has_dsp) {
837 ret = -EIO;
838 break;
839 }
840 child->thread.dsp.dspcontrol = data;
841 break;
842 default:
843 /* The rest are not allowed. */
844 ret = -EIO;
845 break;
846 }
847 break;
848 }
849
850 case PTRACE_GETREGS:
851 ret = ptrace_getregs(child, datavp);
852 break;
853
854 case PTRACE_SETREGS:
855 ret = ptrace_setregs(child, datavp);
856 break;
857
858 case PTRACE_GETFPREGS:
859 ret = ptrace_getfpregs(child, datavp);
860 break;
861
862 case PTRACE_SETFPREGS:
863 ret = ptrace_setfpregs(child, datavp);
864 break;
865
866 case PTRACE_GET_THREAD_AREA:
867 ret = put_user(task_thread_info(child)->tp_value, datalp);
868 break;
869
870 case PTRACE_GET_WATCH_REGS:
871 ret = ptrace_get_watch_regs(child, addrp);
872 break;
873
874 case PTRACE_SET_WATCH_REGS:
875 ret = ptrace_set_watch_regs(child, addrp);
876 break;
877
878 default:
879 ret = ptrace_request(child, request, addr, data);
880 break;
881 }
882 out:
883 return ret;
884}
885
886/*
887 * Notification of system call entry/exit
888 * - triggered by current->work.syscall_trace
889 */
890asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
891{
892 user_exit();
893
894 current_thread_info()->syscall = syscall;
895
896 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
897 tracehook_report_syscall_entry(regs))
898 return -1;
899
900 if (secure_computing(NULL) == -1)
901 return -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 */
915asmlinkage 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}