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MIPS/ptrace: Pick up ptrace/seccomp changed syscalls
[linux-2.6-block.git] / arch / mips / kernel / ptrace.c
CommitLineData
1da177e4
LT		 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 */
1da177e4 17#include <linux/compiler.h>
c3fc5cd5 18#include <linux/context_tracking.h>
7aeb753b 19#include <linux/elf.h>
1da177e4
LT		 20#include <linux/kernel.h>
21#include <linux/sched.h>
68db0cf1 22#include <linux/sched/task_stack.h>
1da177e4
LT		 23#include <linux/mm.h>
24#include <linux/errno.h>
25#include <linux/ptrace.h>
7aeb753b 26#include <linux/regset.h>
1da177e4 27#include <linux/smp.h>
1da177e4 28#include <linux/security.h>
40e084a5 29#include <linux/stddef.h>
bc3d22c1 30#include <linux/tracehook.h>
293c5bd1
RB		 31#include <linux/audit.h>
32#include <linux/seccomp.h>
1d7bf993 33#include <linux/ftrace.h>
1da177e4 34
f8280c8d 35#include <asm/byteorder.h>
1da177e4 36#include <asm/cpu.h>
9b26616c 37#include <asm/cpu-info.h>
e50c0a8f 38#include <asm/dsp.h>
1da177e4
LT		 39#include <asm/fpu.h>
40#include <asm/mipsregs.h>
101b3531 41#include <asm/mipsmtregs.h>
1da177e4
LT		 42#include <asm/pgtable.h>
43#include <asm/page.h>
bec9b2b2 44#include <asm/syscall.h>
7c0f6ba6 45#include <linux/uaccess.h>
1da177e4 46#include <asm/bootinfo.h>
ea3d710f 47#include <asm/reg.h>
1da177e4 48
1d7bf993
RB		 49#define CREATE_TRACE_POINTS
50#include <trace/events/syscalls.h>
51
ac9ad83b
PB		 52static void init_fp_ctx(struct task_struct *target)
53{
54 /* If FP has been used then the target already has context */
55 if (tsk_used_math(target))
56 return;
57
58 /* Begin with data registers set to all 1s... */
59 memset(&target->thread.fpu.fpr, ~0, sizeof(target->thread.fpu.fpr));
60
abf378be 61 /* FCSR has been preset by `mips_set_personality_nan'. */
ac9ad83b
PB		 62
63 /*
64 * Record that the target has "used" math, such that the context
65 * just initialised, and any modifications made by the caller,
66 * aren't discarded.
67 */
68 set_stopped_child_used_math(target);
69}
70
1da177e4
LT		 71/*
72 * Called by kernel/ptrace.c when detaching..
73 *
74 * Make sure single step bits etc are not set.
75 */
76void ptrace_disable(struct task_struct *child)
77{
0926bf95
DD		 78 /* Don't load the watchpoint registers for the ex-child. */
79 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
1da177e4
LT		 80}
81
abf378be 82/*
5a1aca44
MR		 83 * Poke at FCSR according to its mask. Set the Cause bits even
84 * if a corresponding Enable bit is set. This will be noticed at
85 * the time the thread is switched to and SIGFPE thrown accordingly.
abf378be
MR		 86 */
87static void ptrace_setfcr31(struct task_struct *child, u32 value)
88{
89 u32 fcr31;
90 u32 mask;
91
abf378be
MR		 92 fcr31 = child->thread.fpu.fcr31;
93 mask = boot_cpu_data.fpu_msk31;
94 child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask);
95}
96
ea3d710f 97/*
70342287 98 * Read a general register set. We always use the 64-bit format, even
ea3d710f
DJ		 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 */
a79ebea6 102int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data)
ea3d710f
DJ		 103{
104 struct pt_regs *regs;
105 int i;
106
107 if (!access_ok(VERIFY_WRITE, data, 38 * 8))
108 return -EIO;
109
40bc9c67 110 regs = task_pt_regs(child);
ea3d710f
DJ		 111
112 for (i = 0; i < 32; i++)
a79ebea6
AS		 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);
ea3d710f
DJ		 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 */
a79ebea6 129int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data)
ea3d710f
DJ		 130{
131 struct pt_regs *regs;
132 int i;
133
134 if (!access_ok(VERIFY_READ, data, 38 * 8))
135 return -EIO;
136
40bc9c67 137 regs = task_pt_regs(child);
ea3d710f
DJ		 138
139 for (i = 0; i < 32; i++)
a79ebea6
AS		 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);
ea3d710f
DJ		 144
145 /* badvaddr, status, and cause may not be written. */
146
147 return 0;
148}
149
49a89efb 150int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
ea3d710f
DJ		 151{
152 int i;
153
154 if (!access_ok(VERIFY_WRITE, data, 33 * 8))
155 return -EIO;
156
157 if (tsk_used_math(child)) {
bbd426f5 158 union fpureg *fregs = get_fpu_regs(child);
ea3d710f 159 for (i = 0; i < 32; i++)
bbd426f5
PB		 160 __put_user(get_fpr64(&fregs[i], 0),
161 i + (__u64 __user *)data);
ea3d710f
DJ		 162 } else {
163 for (i = 0; i < 32; i++)
49a89efb 164 __put_user((__u64) -1, i + (__u64 __user *) data);
ea3d710f
DJ		 165 }
166
49a89efb 167 __put_user(child->thread.fpu.fcr31, data + 64);
656ff9be 168 __put_user(boot_cpu_data.fpu_id, data + 65);
ea3d710f
DJ		 169
170 return 0;
171}
172
49a89efb 173int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
ea3d710f 174{
bbd426f5
PB		 175 union fpureg *fregs;
176 u64 fpr_val;
9b26616c 177 u32 value;
ea3d710f
DJ		 178 int i;
179
180 if (!access_ok(VERIFY_READ, data, 33 * 8))
181 return -EIO;
182
ac9ad83b 183 init_fp_ctx(child);
ea3d710f
DJ		 184 fregs = get_fpu_regs(child);
185
bbd426f5
PB		 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 }
ea3d710f 190
9b26616c 191 __get_user(value, data + 64);
abf378be 192 ptrace_setfcr31(child, value);
ea3d710f
DJ		 193
194 /* FIR may not be written. */
195
196 return 0;
197}
198
0926bf95
DD		 199int 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
57c7ea51 205 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
0926bf95
DD		 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);
57c7ea51 219 __put_user(boot_cpu_data.watch_reg_use_cnt,
0926bf95 220 &addr->WATCH_STYLE.num_valid);
57c7ea51 221 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
0926bf95
DD		 222 __put_user(child->thread.watch.mips3264.watchlo[i],
223 &addr->WATCH_STYLE.watchlo[i]);
50af501c
JH		 224 __put_user(child->thread.watch.mips3264.watchhi[i] &
225 (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW),
0926bf95 226 &addr->WATCH_STYLE.watchhi[i]);
57c7ea51 227 __put_user(boot_cpu_data.watch_reg_masks[i],
0926bf95
DD		 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
239int 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
57c7ea51 247 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
0926bf95
DD		 248 return -EIO;
249 if (!access_ok(VERIFY_READ, addr, sizeof(struct pt_watch_regs)))
250 return -EIO;
251 /* Check the values. */
57c7ea51 252 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
0926bf95
DD		 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]);
50af501c 267 if (ht[i] & ~MIPS_WATCHHI_MASK)
0926bf95
DD		 268 return -EINVAL;
269 }
270 /* Install them. */
57c7ea51 271 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
50af501c 272 if (lt[i] & MIPS_WATCHLO_IRW)
0926bf95
DD		 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
7aeb753b
RB		 287/* regset get/set implementations */
288
c23b3d1a
AS		 289#if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
290
291static 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)
7aeb753b
RB		 295{
296 struct pt_regs *regs = task_pt_regs(target);
c23b3d1a 297 u32 uregs[ELF_NGREG] = {};
7aeb753b 298
08c941bf 299 mips_dump_regs32(uregs, regs);
c23b3d1a
AS		 300 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
301 sizeof(uregs));
7aeb753b
RB		 302}
303
c23b3d1a
AS		 304static int gpr32_set(struct task_struct *target,
305 const struct user_regset *regset,
306 unsigned int pos, unsigned int count,
307 const void *kbuf, const void __user *ubuf)
7aeb753b 308{
c23b3d1a
AS		 309 struct pt_regs *regs = task_pt_regs(target);
310 u32 uregs[ELF_NGREG];
311 unsigned start, num_regs, i;
312 int err;
313
314 start = pos / sizeof(u32);
315 num_regs = count / sizeof(u32);
316
317 if (start + num_regs > ELF_NGREG)
318 return -EIO;
319
320 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
321 sizeof(uregs));
322 if (err)
323 return err;
324
325 for (i = start; i < num_regs; i++) {
326 /*
327 * Cast all values to signed here so that if this is a 64-bit
328 * kernel, the supplied 32-bit values will be sign extended.
329 */
330 switch (i) {
331 case MIPS32_EF_R1 ... MIPS32_EF_R25:
332 /* k0/k1 are ignored. */
333 case MIPS32_EF_R28 ... MIPS32_EF_R31:
334 regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i];
335 break;
336 case MIPS32_EF_LO:
337 regs->lo = (s32)uregs[i];
338 break;
339 case MIPS32_EF_HI:
340 regs->hi = (s32)uregs[i];
341 break;
342 case MIPS32_EF_CP0_EPC:
343 regs->cp0_epc = (s32)uregs[i];
344 break;
345 }
346 }
347
348 return 0;
349}
350
351#endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
352
353#ifdef CONFIG_64BIT
354
355static int gpr64_get(struct task_struct *target,
356 const struct user_regset *regset,
357 unsigned int pos, unsigned int count,
358 void *kbuf, void __user *ubuf)
359{
360 struct pt_regs *regs = task_pt_regs(target);
361 u64 uregs[ELF_NGREG] = {};
c23b3d1a 362
08c941bf 363 mips_dump_regs64(uregs, regs);
c23b3d1a
AS		 364 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
365 sizeof(uregs));
366}
7aeb753b 367
c23b3d1a
AS		 368static int gpr64_set(struct task_struct *target,
369 const struct user_regset *regset,
370 unsigned int pos, unsigned int count,
371 const void *kbuf, const void __user *ubuf)
372{
373 struct pt_regs *regs = task_pt_regs(target);
374 u64 uregs[ELF_NGREG];
375 unsigned start, num_regs, i;
376 int err;
377
378 start = pos / sizeof(u64);
379 num_regs = count / sizeof(u64);
380
381 if (start + num_regs > ELF_NGREG)
382 return -EIO;
7aeb753b 383
c23b3d1a
AS		 384 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
385 sizeof(uregs));
386 if (err)
387 return err;
388
389 for (i = start; i < num_regs; i++) {
390 switch (i) {
391 case MIPS64_EF_R1 ... MIPS64_EF_R25:
392 /* k0/k1 are ignored. */
393 case MIPS64_EF_R28 ... MIPS64_EF_R31:
394 regs->regs[i - MIPS64_EF_R0] = uregs[i];
395 break;
396 case MIPS64_EF_LO:
397 regs->lo = uregs[i];
398 break;
399 case MIPS64_EF_HI:
400 regs->hi = uregs[i];
401 break;
402 case MIPS64_EF_CP0_EPC:
403 regs->cp0_epc = uregs[i];
404 break;
405 }
406 }
7aeb753b
RB		 407
408 return 0;
409}
410
c23b3d1a
AS		 411#endif /* CONFIG_64BIT */
412
7aeb753b
RB		 413static int fpr_get(struct task_struct *target,
414 const struct user_regset *regset,
415 unsigned int pos, unsigned int count,
416 void *kbuf, void __user *ubuf)
417{
72b22bba
PB		 418 unsigned i;
419 int err;
420 u64 fpr_val;
421
7aeb753b 422 /* XXX fcr31 */
72b22bba
PB		 423
424 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
425 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
426 &target->thread.fpu,
427 0, sizeof(elf_fpregset_t));
428
429 for (i = 0; i < NUM_FPU_REGS; i++) {
430 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
431 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
432 &fpr_val, i * sizeof(elf_fpreg_t),
433 (i + 1) * sizeof(elf_fpreg_t));
434 if (err)
435 return err;
436 }
437
438 return 0;
7aeb753b
RB		 439}
440
441static int fpr_set(struct task_struct *target,
442 const struct user_regset *regset,
443 unsigned int pos, unsigned int count,
444 const void *kbuf, const void __user *ubuf)
445{
72b22bba
PB		 446 unsigned i;
447 int err;
448 u64 fpr_val;
449
7aeb753b 450 /* XXX fcr31 */
72b22bba 451
ac9ad83b
PB		 452 init_fp_ctx(target);
453
72b22bba
PB		 454 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
455 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
456 &target->thread.fpu,
457 0, sizeof(elf_fpregset_t));
458
d614fd58
DM		 459 BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
460 for (i = 0; i < NUM_FPU_REGS && count >= sizeof(elf_fpreg_t); i++) {
72b22bba
PB		 461 err = user_regset_copyin(&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 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
467 }
468
469 return 0;
7aeb753b
RB		 470}
471
472enum mips_regset {
473 REGSET_GPR,
474 REGSET_FPR,
475};
476
40e084a5
RB		 477struct pt_regs_offset {
478 const char *name;
479 int offset;
480};
481
482#define REG_OFFSET_NAME(reg, r) { \
483 .name = #reg, \
484 .offset = offsetof(struct pt_regs, r) \
485}
486
487#define REG_OFFSET_END { \
488 .name = NULL, \
489 .offset = 0 \
490}
491
492static const struct pt_regs_offset regoffset_table[] = {
493 REG_OFFSET_NAME(r0, regs[0]),
494 REG_OFFSET_NAME(r1, regs[1]),
495 REG_OFFSET_NAME(r2, regs[2]),
496 REG_OFFSET_NAME(r3, regs[3]),
497 REG_OFFSET_NAME(r4, regs[4]),
498 REG_OFFSET_NAME(r5, regs[5]),
499 REG_OFFSET_NAME(r6, regs[6]),
500 REG_OFFSET_NAME(r7, regs[7]),
501 REG_OFFSET_NAME(r8, regs[8]),
502 REG_OFFSET_NAME(r9, regs[9]),
503 REG_OFFSET_NAME(r10, regs[10]),
504 REG_OFFSET_NAME(r11, regs[11]),
505 REG_OFFSET_NAME(r12, regs[12]),
506 REG_OFFSET_NAME(r13, regs[13]),
507 REG_OFFSET_NAME(r14, regs[14]),
508 REG_OFFSET_NAME(r15, regs[15]),
509 REG_OFFSET_NAME(r16, regs[16]),
510 REG_OFFSET_NAME(r17, regs[17]),
511 REG_OFFSET_NAME(r18, regs[18]),
512 REG_OFFSET_NAME(r19, regs[19]),
513 REG_OFFSET_NAME(r20, regs[20]),
514 REG_OFFSET_NAME(r21, regs[21]),
515 REG_OFFSET_NAME(r22, regs[22]),
516 REG_OFFSET_NAME(r23, regs[23]),
517 REG_OFFSET_NAME(r24, regs[24]),
518 REG_OFFSET_NAME(r25, regs[25]),
519 REG_OFFSET_NAME(r26, regs[26]),
520 REG_OFFSET_NAME(r27, regs[27]),
521 REG_OFFSET_NAME(r28, regs[28]),
522 REG_OFFSET_NAME(r29, regs[29]),
523 REG_OFFSET_NAME(r30, regs[30]),
524 REG_OFFSET_NAME(r31, regs[31]),
525 REG_OFFSET_NAME(c0_status, cp0_status),
526 REG_OFFSET_NAME(hi, hi),
527 REG_OFFSET_NAME(lo, lo),
528#ifdef CONFIG_CPU_HAS_SMARTMIPS
529 REG_OFFSET_NAME(acx, acx),
530#endif
531 REG_OFFSET_NAME(c0_badvaddr, cp0_badvaddr),
532 REG_OFFSET_NAME(c0_cause, cp0_cause),
533 REG_OFFSET_NAME(c0_epc, cp0_epc),
40e084a5
RB		 534#ifdef CONFIG_CPU_CAVIUM_OCTEON
535 REG_OFFSET_NAME(mpl0, mpl[0]),
536 REG_OFFSET_NAME(mpl1, mpl[1]),
537 REG_OFFSET_NAME(mpl2, mpl[2]),
538 REG_OFFSET_NAME(mtp0, mtp[0]),
539 REG_OFFSET_NAME(mtp1, mtp[1]),
540 REG_OFFSET_NAME(mtp2, mtp[2]),
541#endif
542 REG_OFFSET_END,
543};
544
545/**
546 * regs_query_register_offset() - query register offset from its name
547 * @name: the name of a register
548 *
549 * regs_query_register_offset() returns the offset of a register in struct
550 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
551 */
552int regs_query_register_offset(const char *name)
553{
554 const struct pt_regs_offset *roff;
555 for (roff = regoffset_table; roff->name != NULL; roff++)
556 if (!strcmp(roff->name, name))
557 return roff->offset;
558 return -EINVAL;
559}
560
c23b3d1a
AS		 561#if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
562
7aeb753b
RB		 563static const struct user_regset mips_regsets[] = {
564 [REGSET_GPR] = {
565 .core_note_type = NT_PRSTATUS,
566 .n = ELF_NGREG,
567 .size = sizeof(unsigned int),
568 .align = sizeof(unsigned int),
c23b3d1a
AS		 569 .get = gpr32_get,
570 .set = gpr32_set,
7aeb753b
RB		 571 },
572 [REGSET_FPR] = {
573 .core_note_type = NT_PRFPREG,
574 .n = ELF_NFPREG,
575 .size = sizeof(elf_fpreg_t),
576 .align = sizeof(elf_fpreg_t),
577 .get = fpr_get,
578 .set = fpr_set,
579 },
580};
581
582static const struct user_regset_view user_mips_view = {
583 .name = "mips",
584 .e_machine = ELF_ARCH,
585 .ei_osabi = ELF_OSABI,
586 .regsets = mips_regsets,
587 .n = ARRAY_SIZE(mips_regsets),
588};
589
c23b3d1a
AS		 590#endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
591
592#ifdef CONFIG_64BIT
593
7aeb753b
RB		 594static const struct user_regset mips64_regsets[] = {
595 [REGSET_GPR] = {
596 .core_note_type = NT_PRSTATUS,
597 .n = ELF_NGREG,
598 .size = sizeof(unsigned long),
599 .align = sizeof(unsigned long),
c23b3d1a
AS		 600 .get = gpr64_get,
601 .set = gpr64_set,
7aeb753b
RB		 602 },
603 [REGSET_FPR] = {
604 .core_note_type = NT_PRFPREG,
605 .n = ELF_NFPREG,
606 .size = sizeof(elf_fpreg_t),
607 .align = sizeof(elf_fpreg_t),
608 .get = fpr_get,
609 .set = fpr_set,
610 },
611};
612
613static const struct user_regset_view user_mips64_view = {
c23b3d1a 614 .name = "mips64",
7aeb753b
RB		 615 .e_machine = ELF_ARCH,
616 .ei_osabi = ELF_OSABI,
617 .regsets = mips64_regsets,
c23b3d1a 618 .n = ARRAY_SIZE(mips64_regsets),
7aeb753b
RB		 619};
620
547da673
MR		 621#ifdef CONFIG_MIPS32_N32
622
623static const struct user_regset_view user_mipsn32_view = {
624 .name = "mipsn32",
625 .e_flags = EF_MIPS_ABI2,
626 .e_machine = ELF_ARCH,
627 .ei_osabi = ELF_OSABI,
628 .regsets = mips64_regsets,
629 .n = ARRAY_SIZE(mips64_regsets),
630};
631
632#endif /* CONFIG_MIPS32_N32 */
633
c23b3d1a
AS		 634#endif /* CONFIG_64BIT */
635
7aeb753b
RB		 636const struct user_regset_view *task_user_regset_view(struct task_struct *task)
637{
638#ifdef CONFIG_32BIT
639 return &user_mips_view;
c23b3d1a 640#else
7aeb753b 641#ifdef CONFIG_MIPS32_O32
c23b3d1a
AS		 642 if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
643 return &user_mips_view;
547da673
MR		 644#endif
645#ifdef CONFIG_MIPS32_N32
646 if (test_tsk_thread_flag(task, TIF_32BIT_ADDR))
647 return &user_mipsn32_view;
7aeb753b 648#endif
7aeb753b 649 return &user_mips64_view;
c23b3d1a 650#endif
7aeb753b
RB		 651}
652
9b05a69e
NK		 653long arch_ptrace(struct task_struct *child, long request,
654 unsigned long addr, unsigned long data)
1da177e4 655{
1da177e4 656 int ret;
fb671139
NK		 657 void __user *addrp = (void __user *) addr;
658 void __user *datavp = (void __user *) data;
659 unsigned long __user *datalp = (void __user *) data;
1da177e4 660
1da177e4
LT		 661 switch (request) {
662 /* when I and D space are separate, these will need to be fixed. */
663 case PTRACE_PEEKTEXT: /* read word at location addr. */
76647323
AD		 664 case PTRACE_PEEKDATA:
665 ret = generic_ptrace_peekdata(child, addr, data);
1da177e4 666 break;
1da177e4
LT		 667
668 /* Read the word at location addr in the USER area. */
669 case PTRACE_PEEKUSR: {
670 struct pt_regs *regs;
bbd426f5 671 union fpureg *fregs;
1da177e4
LT		 672 unsigned long tmp = 0;
673
40bc9c67 674 regs = task_pt_regs(child);
1da177e4
LT		 675 ret = 0; /* Default return value. */
676
677 switch (addr) {
678 case 0 ... 31:
679 tmp = regs->regs[addr];
680 break;
681 case FPR_BASE ... FPR_BASE + 31:
597ce172
PB		 682 if (!tsk_used_math(child)) {
683 /* FP not yet used */
684 tmp = -1;
685 break;
686 }
687 fregs = get_fpu_regs(child);
1da177e4 688
875d43e7 689#ifdef CONFIG_32BIT
597ce172 690 if (test_thread_flag(TIF_32BIT_FPREGS)) {
1da177e4
LT		 691 /*
692 * The odd registers are actually the high
693 * order bits of the values stored in the even
694 * registers - unless we're using r2k_switch.S.
695 */
bbd426f5
PB		 696 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
697 addr & 1);
597ce172 698 break;
1da177e4 699 }
597ce172 700#endif
bbd426f5 701 tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
1da177e4
LT		 702 break;
703 case PC:
704 tmp = regs->cp0_epc;
705 break;
706 case CAUSE:
707 tmp = regs->cp0_cause;
708 break;
709 case BADVADDR:
710 tmp = regs->cp0_badvaddr;
711 break;
712 case MMHI:
713 tmp = regs->hi;
714 break;
715 case MMLO:
716 tmp = regs->lo;
717 break;
9693a853
FBH		 718#ifdef CONFIG_CPU_HAS_SMARTMIPS
719 case ACX:
720 tmp = regs->acx;
721 break;
722#endif
1da177e4 723 case FPC_CSR:
eae89076 724 tmp = child->thread.fpu.fcr31;
1da177e4 725 break;
3351047f
PB		 726 case FPC_EIR:
727 /* implementation / version register */
656ff9be 728 tmp = boot_cpu_data.fpu_id;
1da177e4 729 break;
c134a5ec
RB		 730 case DSP_BASE ... DSP_BASE + 5: {
731 dspreg_t *dregs;
732
e50c0a8f
RB		 733 if (!cpu_has_dsp) {
734 tmp = 0;
735 ret = -EIO;
481bed45 736 goto out;
e50c0a8f 737 }
6c355852
RB		 738 dregs = __get_dsp_regs(child);
739 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
e50c0a8f 740 break;
c134a5ec 741 }
e50c0a8f
RB		 742 case DSP_CONTROL:
743 if (!cpu_has_dsp) {
744 tmp = 0;
745 ret = -EIO;
481bed45 746 goto out;
e50c0a8f
RB		 747 }
748 tmp = child->thread.dsp.dspcontrol;
749 break;
1da177e4
LT		 750 default:
751 tmp = 0;
752 ret = -EIO;
481bed45 753 goto out;
1da177e4 754 }
fb671139 755 ret = put_user(tmp, datalp);
1da177e4
LT		 756 break;
757 }
758
759 /* when I and D space are separate, this will have to be fixed. */
760 case PTRACE_POKETEXT: /* write the word at location addr. */
761 case PTRACE_POKEDATA:
f284ce72 762 ret = generic_ptrace_pokedata(child, addr, data);
1da177e4
LT		 763 break;
764
765 case PTRACE_POKEUSR: {
766 struct pt_regs *regs;
767 ret = 0;
40bc9c67 768 regs = task_pt_regs(child);
1da177e4
LT		 769
770 switch (addr) {
771 case 0 ... 31:
772 regs->regs[addr] = data;
773 break;
774 case FPR_BASE ... FPR_BASE + 31: {
bbd426f5 775 union fpureg *fregs = get_fpu_regs(child);
1da177e4 776
ac9ad83b 777 init_fp_ctx(child);
875d43e7 778#ifdef CONFIG_32BIT
597ce172
PB		 779 if (test_thread_flag(TIF_32BIT_FPREGS)) {
780 /*
781 * The odd registers are actually the high
782 * order bits of the values stored in the even
783 * registers - unless we're using r2k_switch.S.
784 */
bbd426f5
PB		 785 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
786 addr & 1, data);
597ce172 787 break;
1da177e4
LT		 788 }
789#endif
bbd426f5 790 set_fpr64(&fregs[addr - FPR_BASE], 0, data);
1da177e4
LT		 791 break;
792 }
793 case PC:
794 regs->cp0_epc = data;
795 break;
796 case MMHI:
797 regs->hi = data;
798 break;
799 case MMLO:
800 regs->lo = data;
801 break;
9693a853
FBH		 802#ifdef CONFIG_CPU_HAS_SMARTMIPS
803 case ACX:
804 regs->acx = data;
805 break;
806#endif
1da177e4 807 case FPC_CSR:
c9e56039 808 init_fp_ctx(child);
abf378be 809 ptrace_setfcr31(child, data);
1da177e4 810 break;
c134a5ec
RB		 811 case DSP_BASE ... DSP_BASE + 5: {
812 dspreg_t *dregs;
813
e50c0a8f
RB		 814 if (!cpu_has_dsp) {
815 ret = -EIO;
816 break;
817 }
818
c134a5ec 819 dregs = __get_dsp_regs(child);
e50c0a8f
RB		 820 dregs[addr - DSP_BASE] = data;
821 break;
c134a5ec 822 }
e50c0a8f
RB		 823 case DSP_CONTROL:
824 if (!cpu_has_dsp) {
825 ret = -EIO;
826 break;
827 }
828 child->thread.dsp.dspcontrol = data;
829 break;
1da177e4
LT		 830 default:
831 /* The rest are not allowed. */
832 ret = -EIO;
833 break;
834 }
835 break;
836 }
837
ea3d710f 838 case PTRACE_GETREGS:
fb671139 839 ret = ptrace_getregs(child, datavp);
ea3d710f
DJ		 840 break;
841
842 case PTRACE_SETREGS:
fb671139 843 ret = ptrace_setregs(child, datavp);
ea3d710f
DJ		 844 break;
845
846 case PTRACE_GETFPREGS:
fb671139 847 ret = ptrace_getfpregs(child, datavp);
ea3d710f
DJ		 848 break;
849
850 case PTRACE_SETFPREGS:
fb671139 851 ret = ptrace_setfpregs(child, datavp);
ea3d710f
DJ		 852 break;
853
3c37026d 854 case PTRACE_GET_THREAD_AREA:
fb671139 855 ret = put_user(task_thread_info(child)->tp_value, datalp);
3c37026d
RB		 856 break;
857
0926bf95 858 case PTRACE_GET_WATCH_REGS:
fb671139 859 ret = ptrace_get_watch_regs(child, addrp);
0926bf95
DD		 860 break;
861
862 case PTRACE_SET_WATCH_REGS:
fb671139 863 ret = ptrace_set_watch_regs(child, addrp);
0926bf95
DD		 864 break;
865
1da177e4
LT		 866 default:
867 ret = ptrace_request(child, request, addr, data);
868 break;
869 }
481bed45 870 out:
1da177e4
LT		 871 return ret;
872}
873
874/*
875 * Notification of system call entry/exit
876 * - triggered by current->work.syscall_trace
877 */
4c21b8fd 878asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
1da177e4 879{
c3fc5cd5
RB		 880 user_exit();
881
c2d9f177
LP		 882 current_thread_info()->syscall = syscall;
883
b6318a90
JH		 884 if (test_thread_flag(TIF_SYSCALL_TRACE)) {
885 if (tracehook_report_syscall_entry(regs))
886 return -1;
887 syscall = current_thread_info()->syscall;
888 }
2ac3c8d1 889
669c4092
DD		 890#ifdef CONFIG_SECCOMP
891 if (unlikely(test_thread_flag(TIF_SECCOMP))) {
892 int ret, i;
893 struct seccomp_data sd;
3d729dea 894 unsigned long args[6];
669c4092
DD		 895
896 sd.nr = syscall;
897 sd.arch = syscall_get_arch();
3d729dea
JH		 898 syscall_get_arguments(current, regs, 0, 6, args);
899 for (i = 0; i < 6; i++)
900 sd.args[i] = args[i];
669c4092
DD		 901 sd.instruction_pointer = KSTK_EIP(current);
902
903 ret = __secure_computing(&sd);
904 if (ret == -1)
905 return ret;
b6318a90 906 syscall = current_thread_info()->syscall;
669c4092
DD		 907 }
908#endif
293c5bd1 909
1d7bf993
RB		 910 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
911 trace_sys_enter(regs, regs->regs[2]);
912
91397401 913 audit_syscall_entry(syscall, regs->regs[4], regs->regs[5],
b05d8447 914 regs->regs[6], regs->regs[7]);
828db212
JH		 915
916 /*
917 * Negative syscall numbers are mistaken for rejected syscalls, but
918 * won't have had the return value set appropriately, so we do so now.
919 */
920 if (syscall < 0)
921 syscall_set_return_value(current, regs, -ENOSYS, 0);
1225eb82 922 return syscall;
1da177e4 923}
8b659a39
RB		 924
925/*
926 * Notification of system call entry/exit
927 * - triggered by current->work.syscall_trace
928 */
929asmlinkage void syscall_trace_leave(struct pt_regs *regs)
930{
c3fc5cd5
RB		 931 /*
932 * We may come here right after calling schedule_user()
933 * or do_notify_resume(), in which case we can be in RCU
934 * user mode.
935 */
936 user_exit();
937
d7e7528b 938 audit_syscall_exit(regs);
8b659a39 939
1d7bf993 940 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
4f32a39d 941 trace_sys_exit(regs, regs_return_value(regs));
1d7bf993 942
bc3d22c1
RB		 943 if (test_thread_flag(TIF_SYSCALL_TRACE))
944 tracehook_report_syscall_exit(regs, 0);
c3fc5cd5
RB		 945
946 user_enter();
8b659a39 947}
Linux 6.x block layer and io_uring tree(s)