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         /* ...and FCSR zeroed */
  61         target->thread.fpu.fcr31 = 0;
  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
  71 /*
  72  * Called by kernel/ptrace.c when detaching..
  73  *
  74  * Make sure single step bits etc are not set.
  75  */
  76 void ptrace_disable(struct task_struct *child)
  77 {
  78         /* Don't load the watchpoint registers for the ex-child. */
  79         clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
  80 }
  81
  82 /*
  83  * Read a general register set.  We always use the 64-bit format, even
  84  * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
  85  * Registers are sign extended to fill the available space.
  86  */
  87 int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data)
  88 {
  89         struct pt_regs *regs;
  90         int i;
  91
  92         if (!access_ok(VERIFY_WRITE, data, 38 * 8))
  93                 return -EIO;
  94
  95         regs = task_pt_regs(child);
  96
  97         for (i = 0; i < 32; i++)
  98                 __put_user((long)regs->regs[i], (__s64 __user *)&data->regs[i]);
  99         __put_user((long)regs->lo, (__s64 __user *)&data->lo);
 100         __put_user((long)regs->hi, (__s64 __user *)&data->hi);
 101         __put_user((long)regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
 102         __put_user((long)regs->cp0_badvaddr, (__s64 __user *)&data->cp0_badvaddr);
 103         __put_user((long)regs->cp0_status, (__s64 __user *)&data->cp0_status);
 104         __put_user((long)regs->cp0_cause, (__s64 __user *)&data->cp0_cause);
 105
 106         return 0;
 107 }
 108
 109 /*
 110  * Write a general register set.  As for PTRACE_GETREGS, we always use
 111  * the 64-bit format.  On a 32-bit kernel only the lower order half
 112  * (according to endianness) will be used.
 113  */
 114 int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data)
 115 {
 116         struct pt_regs *regs;
 117         int i;
 118
 119         if (!access_ok(VERIFY_READ, data, 38 * 8))
 120                 return -EIO;
 121
 122         regs = task_pt_regs(child);
 123
 124         for (i = 0; i < 32; i++)
 125                 __get_user(regs->regs[i], (__s64 __user *)&data->regs[i]);
 126         __get_user(regs->lo, (__s64 __user *)&data->lo);
 127         __get_user(regs->hi, (__s64 __user *)&data->hi);
 128         __get_user(regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
 129
 130         /* badvaddr, status, and cause may not be written.  */
 131
 132         return 0;
 133 }
 134
 135 int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
 136 {
 137         int i;
 138
 139         if (!access_ok(VERIFY_WRITE, data, 33 * 8))
 140                 return -EIO;
 141
 142         if (tsk_used_math(child)) {
 143                 union fpureg *fregs = get_fpu_regs(child);
 144                 for (i = 0; i < 32; i++)
 145                         __put_user(get_fpr64(&fregs[i], 0),
 146                                    i + (__u64 __user *)data);
 147         } else {
 148                 for (i = 0; i < 32; i++)
 149                         __put_user((__u64) -1, i + (__u64 __user *) data);
 150         }
 151
 152         __put_user(child->thread.fpu.fcr31, data + 64);
 153         __put_user(boot_cpu_data.fpu_id, data + 65);
 154
 155         return 0;
 156 }
 157
 158 int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
 159 {
 160         union fpureg *fregs;
 161         u64 fpr_val;
 162         u32 fcr31;
 163         u32 value;
 164         u32 mask;
 165         int i;
 166
 167         if (!access_ok(VERIFY_READ, data, 33 * 8))
 168                 return -EIO;
 169
 170         init_fp_ctx(child);
 171         fregs = get_fpu_regs(child);
 172
 173         for (i = 0; i < 32; i++) {
 174                 __get_user(fpr_val, i + (__u64 __user *)data);
 175                 set_fpr64(&fregs[i], 0, fpr_val);
 176         }
 177
 178         __get_user(value, data + 64);
 179         fcr31 = child->thread.fpu.fcr31;
 180         mask = boot_cpu_data.fpu_msk31;
 181         child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask);
 182
 183         /* FIR may not be written.  */
 184
 185         return 0;
 186 }
 187
 188 int ptrace_get_watch_regs(struct task_struct *child,
 189                           struct pt_watch_regs __user *addr)
 190 {
 191         enum pt_watch_style style;
 192         int i;
 193
 194         if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
 195                 return -EIO;
 196         if (!access_ok(VERIFY_WRITE, addr, sizeof(struct pt_watch_regs)))
 197                 return -EIO;
 198
 199 #ifdef CONFIG_32BIT
 200         style = pt_watch_style_mips32;
 201 #define WATCH_STYLE mips32
 202 #else
 203         style = pt_watch_style_mips64;
 204 #define WATCH_STYLE mips64
 205 #endif
 206
 207         __put_user(style, &addr->style);
 208         __put_user(boot_cpu_data.watch_reg_use_cnt,
 209                    &addr->WATCH_STYLE.num_valid);
 210         for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
 211                 __put_user(child->thread.watch.mips3264.watchlo[i],
 212                            &addr->WATCH_STYLE.watchlo[i]);
 213                 __put_user(child->thread.watch.mips3264.watchhi[i] & 0xfff,
 214                            &addr->WATCH_STYLE.watchhi[i]);
 215                 __put_user(boot_cpu_data.watch_reg_masks[i],
 216                            &addr->WATCH_STYLE.watch_masks[i]);
 217         }
 218         for (; i < 8; i++) {
 219                 __put_user(0, &addr->WATCH_STYLE.watchlo[i]);
 220                 __put_user(0, &addr->WATCH_STYLE.watchhi[i]);
 221                 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]);
 222         }
 223
 224         return 0;
 225 }
 226
 227 int ptrace_set_watch_regs(struct task_struct *child,
 228                           struct pt_watch_regs __user *addr)
 229 {
 230         int i;
 231         int watch_active = 0;
 232         unsigned long lt[NUM_WATCH_REGS];
 233         u16 ht[NUM_WATCH_REGS];
 234
 235         if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
 236                 return -EIO;
 237         if (!access_ok(VERIFY_READ, addr, sizeof(struct pt_watch_regs)))
 238                 return -EIO;
 239         /* Check the values. */
 240         for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
 241                 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]);
 242 #ifdef CONFIG_32BIT
 243                 if (lt[i] & __UA_LIMIT)
 244                         return -EINVAL;
 245 #else
 246                 if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) {
 247                         if (lt[i] & 0xffffffff80000000UL)
 248                                 return -EINVAL;
 249                 } else {
 250                         if (lt[i] & __UA_LIMIT)
 251                                 return -EINVAL;
 252                 }
 253 #endif
 254                 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
 255                 if (ht[i] & ~0xff8)
 256                         return -EINVAL;
 257         }
 258         /* Install them. */
 259         for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
 260                 if (lt[i] & 7)
 261                         watch_active = 1;
 262                 child->thread.watch.mips3264.watchlo[i] = lt[i];
 263                 /* Set the G bit. */
 264                 child->thread.watch.mips3264.watchhi[i] = ht[i];
 265         }
 266
 267         if (watch_active)
 268                 set_tsk_thread_flag(child, TIF_LOAD_WATCH);
 269         else
 270                 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
 271
 272         return 0;
 273 }
 274
 275 /* regset get/set implementations */
 276
 277 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
 278
 279 static int gpr32_get(struct task_struct *target,
 280                      const struct user_regset *regset,
 281                      unsigned int pos, unsigned int count,
 282                      void *kbuf, void __user *ubuf)
 283 {
 284         struct pt_regs *regs = task_pt_regs(target);
 285         u32 uregs[ELF_NGREG] = {};
 286         unsigned i;
 287
 288         for (i = MIPS32_EF_R1; i <= MIPS32_EF_R31; i++) {
 289                 /* k0/k1 are copied as zero. */
 290                 if (i == MIPS32_EF_R26 || i == MIPS32_EF_R27)
 291                         continue;
 292
 293                 uregs[i] = regs->regs[i - MIPS32_EF_R0];
 294         }
 295
 296         uregs[MIPS32_EF_LO] = regs->lo;
 297         uregs[MIPS32_EF_HI] = regs->hi;
 298         uregs[MIPS32_EF_CP0_EPC] = regs->cp0_epc;
 299         uregs[MIPS32_EF_CP0_BADVADDR] = regs->cp0_badvaddr;
 300         uregs[MIPS32_EF_CP0_STATUS] = regs->cp0_status;
 301         uregs[MIPS32_EF_CP0_CAUSE] = regs->cp0_cause;
 302
 303         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
 304                                    sizeof(uregs));
 305 }
 306
 307 static int gpr32_set(struct task_struct *target,
 308                      const struct user_regset *regset,
 309                      unsigned int pos, unsigned int count,
 310                      const void *kbuf, const void __user *ubuf)
 311 {
 312         struct pt_regs *regs = task_pt_regs(target);
 313         u32 uregs[ELF_NGREG];
 314         unsigned start, num_regs, i;
 315         int err;
 316
 317         start = pos / sizeof(u32);
 318         num_regs = count / sizeof(u32);
 319
 320         if (start + num_regs > ELF_NGREG)
 321                 return -EIO;
 322
 323         err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
 324                                  sizeof(uregs));
 325         if (err)
 326                 return err;
 327
 328         for (i = start; i < num_regs; i++) {
 329                 /*
 330                  * Cast all values to signed here so that if this is a 64-bit
 331                  * kernel, the supplied 32-bit values will be sign extended.
 332                  */
 333                 switch (i) {
 334                 case MIPS32_EF_R1 ... MIPS32_EF_R25:
 335                         /* k0/k1 are ignored. */
 336                 case MIPS32_EF_R28 ... MIPS32_EF_R31:
 337                         regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i];
 338                         break;
 339                 case MIPS32_EF_LO:
 340                         regs->lo = (s32)uregs[i];
 341                         break;
 342                 case MIPS32_EF_HI:
 343                         regs->hi = (s32)uregs[i];
 344                         break;
 345                 case MIPS32_EF_CP0_EPC:
 346                         regs->cp0_epc = (s32)uregs[i];
 347                         break;
 348                 }
 349         }
 350
 351         return 0;
 352 }
 353
 354 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
 355
 356 #ifdef CONFIG_64BIT
 357
 358 static int gpr64_get(struct task_struct *target,
 359                      const struct user_regset *regset,
 360                      unsigned int pos, unsigned int count,
 361                      void *kbuf, void __user *ubuf)
 362 {
 363         struct pt_regs *regs = task_pt_regs(target);
 364         u64 uregs[ELF_NGREG] = {};
 365         unsigned i;
 366
 367         for (i = MIPS64_EF_R1; i <= MIPS64_EF_R31; i++) {
 368                 /* k0/k1 are copied as zero. */
 369                 if (i == MIPS64_EF_R26 || i == MIPS64_EF_R27)
 370                         continue;
 371
 372                 uregs[i] = regs->regs[i - MIPS64_EF_R0];
 373         }
 374
 375         uregs[MIPS64_EF_LO] = regs->lo;
 376         uregs[MIPS64_EF_HI] = regs->hi;
 377         uregs[MIPS64_EF_CP0_EPC] = regs->cp0_epc;
 378         uregs[MIPS64_EF_CP0_BADVADDR] = regs->cp0_badvaddr;
 379         uregs[MIPS64_EF_CP0_STATUS] = regs->cp0_status;
 380         uregs[MIPS64_EF_CP0_CAUSE] = regs->cp0_cause;
 381
 382         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
 383                                    sizeof(uregs));
 384 }
 385
 386 static int gpr64_set(struct task_struct *target,
 387                      const struct user_regset *regset,
 388                      unsigned int pos, unsigned int count,
 389                      const void *kbuf, const void __user *ubuf)
 390 {
 391         struct pt_regs *regs = task_pt_regs(target);
 392         u64 uregs[ELF_NGREG];
 393         unsigned start, num_regs, i;
 394         int err;
 395
 396         start = pos / sizeof(u64);
 397         num_regs = count / sizeof(u64);
 398
 399         if (start + num_regs > ELF_NGREG)
 400                 return -EIO;
 401
 402         err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
 403                                  sizeof(uregs));
 404         if (err)
 405                 return err;
 406
 407         for (i = start; i < num_regs; i++) {
 408                 switch (i) {
 409                 case MIPS64_EF_R1 ... MIPS64_EF_R25:
 410                         /* k0/k1 are ignored. */
 411                 case MIPS64_EF_R28 ... MIPS64_EF_R31:
 412                         regs->regs[i - MIPS64_EF_R0] = uregs[i];
 413                         break;
 414                 case MIPS64_EF_LO:
 415                         regs->lo = uregs[i];
 416                         break;
 417                 case MIPS64_EF_HI:
 418                         regs->hi = uregs[i];
 419                         break;
 420                 case MIPS64_EF_CP0_EPC:
 421                         regs->cp0_epc = uregs[i];
 422                         break;
 423                 }
 424         }
 425
 426         return 0;
 427 }
 428
 429 #endif /* CONFIG_64BIT */
 430
 431 static int fpr_get(struct task_struct *target,
 432                    const struct user_regset *regset,
 433                    unsigned int pos, unsigned int count,
 434                    void *kbuf, void __user *ubuf)
 435 {
 436         unsigned i;
 437         int err;
 438         u64 fpr_val;
 439
 440         /* XXX fcr31  */
 441
 442         if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
 443                 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 444                                            &target->thread.fpu,
 445                                            0, sizeof(elf_fpregset_t));
 446
 447         for (i = 0; i < NUM_FPU_REGS; i++) {
 448                 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
 449                 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 450                                           &fpr_val, i * sizeof(elf_fpreg_t),
 451                                           (i + 1) * sizeof(elf_fpreg_t));
 452                 if (err)
 453                         return err;
 454         }
 455
 456         return 0;
 457 }
 458
 459 static int fpr_set(struct task_struct *target,
 460                    const struct user_regset *regset,
 461                    unsigned int pos, unsigned int count,
 462                    const void *kbuf, const void __user *ubuf)
 463 {
 464         unsigned i;
 465         int err;
 466         u64 fpr_val;
 467
 468         /* XXX fcr31  */
 469
 470         init_fp_ctx(target);
 471
 472         if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
 473                 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 474                                           &target->thread.fpu,
 475                                           0, sizeof(elf_fpregset_t));
 476
 477         for (i = 0; i < NUM_FPU_REGS; i++) {
 478                 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 479                                          &fpr_val, i * sizeof(elf_fpreg_t),
 480                                          (i + 1) * sizeof(elf_fpreg_t));
 481                 if (err)
 482                         return err;
 483                 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
 484         }
 485
 486         return 0;
 487 }
 488
 489 enum mips_regset {
 490         REGSET_GPR,
 491         REGSET_FPR,
 492 };
 493
 494 struct pt_regs_offset {
 495         const char *name;
 496         int offset;
 497 };
 498
 499 #define REG_OFFSET_NAME(reg, r) {                                       \
 500         .name = #reg,                                                   \
 501         .offset = offsetof(struct pt_regs, r)                           \
 502 }
 503
 504 #define REG_OFFSET_END {                                                \
 505         .name = NULL,                                                   \
 506         .offset = 0                                                     \
 507 }
 508
 509 static const struct pt_regs_offset regoffset_table[] = {
 510         REG_OFFSET_NAME(r0, regs[0]),
 511         REG_OFFSET_NAME(r1, regs[1]),
 512         REG_OFFSET_NAME(r2, regs[2]),
 513         REG_OFFSET_NAME(r3, regs[3]),
 514         REG_OFFSET_NAME(r4, regs[4]),
 515         REG_OFFSET_NAME(r5, regs[5]),
 516         REG_OFFSET_NAME(r6, regs[6]),
 517         REG_OFFSET_NAME(r7, regs[7]),
 518         REG_OFFSET_NAME(r8, regs[8]),
 519         REG_OFFSET_NAME(r9, regs[9]),
 520         REG_OFFSET_NAME(r10, regs[10]),
 521         REG_OFFSET_NAME(r11, regs[11]),
 522         REG_OFFSET_NAME(r12, regs[12]),
 523         REG_OFFSET_NAME(r13, regs[13]),
 524         REG_OFFSET_NAME(r14, regs[14]),
 525         REG_OFFSET_NAME(r15, regs[15]),
 526         REG_OFFSET_NAME(r16, regs[16]),
 527         REG_OFFSET_NAME(r17, regs[17]),
 528         REG_OFFSET_NAME(r18, regs[18]),
 529         REG_OFFSET_NAME(r19, regs[19]),
 530         REG_OFFSET_NAME(r20, regs[20]),
 531         REG_OFFSET_NAME(r21, regs[21]),
 532         REG_OFFSET_NAME(r22, regs[22]),
 533         REG_OFFSET_NAME(r23, regs[23]),
 534         REG_OFFSET_NAME(r24, regs[24]),
 535         REG_OFFSET_NAME(r25, regs[25]),
 536         REG_OFFSET_NAME(r26, regs[26]),
 537         REG_OFFSET_NAME(r27, regs[27]),
 538         REG_OFFSET_NAME(r28, regs[28]),
 539         REG_OFFSET_NAME(r29, regs[29]),
 540         REG_OFFSET_NAME(r30, regs[30]),
 541         REG_OFFSET_NAME(r31, regs[31]),
 542         REG_OFFSET_NAME(c0_status, cp0_status),
 543         REG_OFFSET_NAME(hi, hi),
 544         REG_OFFSET_NAME(lo, lo),
 545 #ifdef CONFIG_CPU_HAS_SMARTMIPS
 546         REG_OFFSET_NAME(acx, acx),
 547 #endif
 548         REG_OFFSET_NAME(c0_badvaddr, cp0_badvaddr),
 549         REG_OFFSET_NAME(c0_cause, cp0_cause),
 550         REG_OFFSET_NAME(c0_epc, cp0_epc),
 551 #ifdef CONFIG_CPU_CAVIUM_OCTEON
 552         REG_OFFSET_NAME(mpl0, mpl[0]),
 553         REG_OFFSET_NAME(mpl1, mpl[1]),
 554         REG_OFFSET_NAME(mpl2, mpl[2]),
 555         REG_OFFSET_NAME(mtp0, mtp[0]),
 556         REG_OFFSET_NAME(mtp1, mtp[1]),
 557         REG_OFFSET_NAME(mtp2, mtp[2]),
 558 #endif
 559         REG_OFFSET_END,
 560 };
 561
 562 /**
 563  * regs_query_register_offset() - query register offset from its name
 564  * @name:       the name of a register
 565  *
 566  * regs_query_register_offset() returns the offset of a register in struct
 567  * pt_regs from its name. If the name is invalid, this returns -EINVAL;
 568  */
 569 int regs_query_register_offset(const char *name)
 570 {
 571         const struct pt_regs_offset *roff;
 572         for (roff = regoffset_table; roff->name != NULL; roff++)
 573                 if (!strcmp(roff->name, name))
 574                         return roff->offset;
 575         return -EINVAL;
 576 }
 577
 578 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
 579
 580 static const struct user_regset mips_regsets[] = {
 581         [REGSET_GPR] = {
 582                 .core_note_type = NT_PRSTATUS,
 583                 .n              = ELF_NGREG,
 584                 .size           = sizeof(unsigned int),
 585                 .align          = sizeof(unsigned int),
 586                 .get            = gpr32_get,
 587                 .set            = gpr32_set,
 588         },
 589         [REGSET_FPR] = {
 590                 .core_note_type = NT_PRFPREG,
 591                 .n              = ELF_NFPREG,
 592                 .size           = sizeof(elf_fpreg_t),
 593                 .align          = sizeof(elf_fpreg_t),
 594                 .get            = fpr_get,
 595                 .set            = fpr_set,
 596         },
 597 };
 598
 599 static const struct user_regset_view user_mips_view = {
 600         .name           = "mips",
 601         .e_machine      = ELF_ARCH,
 602         .ei_osabi       = ELF_OSABI,
 603         .regsets        = mips_regsets,
 604         .n              = ARRAY_SIZE(mips_regsets),
 605 };
 606
 607 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
 608
 609 #ifdef CONFIG_64BIT
 610
 611 static const struct user_regset mips64_regsets[] = {
 612         [REGSET_GPR] = {
 613                 .core_note_type = NT_PRSTATUS,
 614                 .n              = ELF_NGREG,
 615                 .size           = sizeof(unsigned long),
 616                 .align          = sizeof(unsigned long),
 617                 .get            = gpr64_get,
 618                 .set            = gpr64_set,
 619         },
 620         [REGSET_FPR] = {
 621                 .core_note_type = NT_PRFPREG,
 622                 .n              = ELF_NFPREG,
 623                 .size           = sizeof(elf_fpreg_t),
 624                 .align          = sizeof(elf_fpreg_t),
 625                 .get            = fpr_get,
 626                 .set            = fpr_set,
 627         },
 628 };
 629
 630 static const struct user_regset_view user_mips64_view = {
 631         .name           = "mips64",
 632         .e_machine      = ELF_ARCH,
 633         .ei_osabi       = ELF_OSABI,
 634         .regsets        = mips64_regsets,
 635         .n              = ARRAY_SIZE(mips64_regsets),
 636 };
 637
 638 #endif /* CONFIG_64BIT */
 639
 640 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 641 {
 642 #ifdef CONFIG_32BIT
 643         return &user_mips_view;
 644 #else
 645 #ifdef CONFIG_MIPS32_O32
 646         if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
 647                 return &user_mips_view;
 648 #endif
 649         return &user_mips64_view;
 650 #endif
 651 }
 652
 653 long arch_ptrace(struct task_struct *child, long request,
 654                  unsigned long addr, unsigned long data)
 655 {
 656         int ret;
 657         void __user *addrp = (void __user *) addr;
 658         void __user *datavp = (void __user *) data;
 659         unsigned long __user *datalp = (void __user *) data;
 660
 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. */
 664         case PTRACE_PEEKDATA:
 665                 ret = generic_ptrace_peekdata(child, addr, data);
 666                 break;
 667
 668         /* Read the word at location addr in the USER area. */
 669         case PTRACE_PEEKUSR: {
 670                 struct pt_regs *regs;
 671                 union fpureg *fregs;
 672                 unsigned long tmp = 0;
 673
 674                 regs = task_pt_regs(child);
 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:
 682                         if (!tsk_used_math(child)) {
 683                                 /* FP not yet used */
 684                                 tmp = -1;
 685                                 break;
 686                         }
 687                         fregs = get_fpu_regs(child);
 688
 689 #ifdef CONFIG_32BIT
 690                         if (test_thread_flag(TIF_32BIT_FPREGS)) {
 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                                  */
 696                                 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
 697                                                 addr & 1);
 698                                 break;
 699                         }
 700 #endif
 701                         tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
 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;
 718 #ifdef CONFIG_CPU_HAS_SMARTMIPS
 719                 case ACX:
 720                         tmp = regs->acx;
 721                         break;
 722 #endif
 723                 case FPC_CSR:
 724                         tmp = child->thread.fpu.fcr31;
 725                         break;
 726                 case FPC_EIR:
 727                         /* implementation / version register */
 728                         tmp = boot_cpu_data.fpu_id;
 729                         break;
 730                 case DSP_BASE ... DSP_BASE + 5: {
 731                         dspreg_t *dregs;
 732
 733                         if (!cpu_has_dsp) {
 734                                 tmp = 0;
 735                                 ret = -EIO;
 736                                 goto out;
 737                         }
 738                         dregs = __get_dsp_regs(child);
 739                         tmp = (unsigned long) (dregs[addr - DSP_BASE]);
 740                         break;
 741                 }
 742                 case DSP_CONTROL:
 743                         if (!cpu_has_dsp) {
 744                                 tmp = 0;
 745                                 ret = -EIO;
 746                                 goto out;
 747                         }
 748                         tmp = child->thread.dsp.dspcontrol;
 749                         break;
 750                 default:
 751                         tmp = 0;
 752                         ret = -EIO;
 753                         goto out;
 754                 }
 755                 ret = put_user(tmp, datalp);
 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:
 762                 ret = generic_ptrace_pokedata(child, addr, data);
 763                 break;
 764
 765         case PTRACE_POKEUSR: {
 766                 struct pt_regs *regs;
 767                 ret = 0;
 768                 regs = task_pt_regs(child);
 769
 770                 switch (addr) {
 771                 case 0 ... 31:
 772                         regs->regs[addr] = data;
 773                         break;
 774                 case FPR_BASE ... FPR_BASE + 31: {
 775                         union fpureg *fregs = get_fpu_regs(child);
 776
 777                         init_fp_ctx(child);
 778 #ifdef CONFIG_32BIT
 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                                  */
 785                                 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
 786                                           addr & 1, data);
 787                                 break;
 788                         }
 789 #endif
 790                         set_fpr64(&fregs[addr - FPR_BASE], 0, data);
 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;
 802 #ifdef CONFIG_CPU_HAS_SMARTMIPS
 803                 case ACX:
 804                         regs->acx = data;
 805                         break;
 806 #endif
 807                 case FPC_CSR:
 808                         child->thread.fpu.fcr31 = data & ~FPU_CSR_ALL_X;
 809                         break;
 810                 case DSP_BASE ... DSP_BASE + 5: {
 811                         dspreg_t *dregs;
 812
 813                         if (!cpu_has_dsp) {
 814                                 ret = -EIO;
 815                                 break;
 816                         }
 817
 818                         dregs = __get_dsp_regs(child);
 819                         dregs[addr - DSP_BASE] = data;
 820                         break;
 821                 }
 822                 case DSP_CONTROL:
 823                         if (!cpu_has_dsp) {
 824                                 ret = -EIO;
 825                                 break;
 826                         }
 827                         child->thread.dsp.dspcontrol = data;
 828                         break;
 829                 default:
 830                         /* The rest are not allowed. */
 831                         ret = -EIO;
 832                         break;
 833                 }
 834                 break;
 835                 }
 836
 837         case PTRACE_GETREGS:
 838                 ret = ptrace_getregs(child, datavp);
 839                 break;
 840
 841         case PTRACE_SETREGS:
 842                 ret = ptrace_setregs(child, datavp);
 843                 break;
 844
 845         case PTRACE_GETFPREGS:
 846                 ret = ptrace_getfpregs(child, datavp);
 847                 break;
 848
 849         case PTRACE_SETFPREGS:
 850                 ret = ptrace_setfpregs(child, datavp);
 851                 break;
 852
 853         case PTRACE_GET_THREAD_AREA:
 854                 ret = put_user(task_thread_info(child)->tp_value, datalp);
 855                 break;
 856
 857         case PTRACE_GET_WATCH_REGS:
 858                 ret = ptrace_get_watch_regs(child, addrp);
 859                 break;
 860
 861         case PTRACE_SET_WATCH_REGS:
 862                 ret = ptrace_set_watch_regs(child, addrp);
 863                 break;
 864
 865         default:
 866                 ret = ptrace_request(child, request, addr, data);
 867                 break;
 868         }
 869  out:
 870         return ret;
 871 }
 872
 873 /*
 874  * Notification of system call entry/exit
 875  * - triggered by current->work.syscall_trace
 876  */
 877 asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
 878 {
 879         long ret = 0;
 880         user_exit();
 881
 882         current_thread_info()->syscall = syscall;
 883
 884         if (secure_computing() == -1)
 885                 return -1;
 886
 887         if (test_thread_flag(TIF_SYSCALL_TRACE) &&
 888             tracehook_report_syscall_entry(regs))
 889                 ret = -1;
 890
 891         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
 892                 trace_sys_enter(regs, regs->regs[2]);
 893
 894         audit_syscall_entry(syscall, regs->regs[4], regs->regs[5],
 895                             regs->regs[6], regs->regs[7]);
 896         return syscall;
 897 }
 898
 899 /*
 900  * Notification of system call entry/exit
 901  * - triggered by current->work.syscall_trace
 902  */
 903 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
 904 {
 905         /*
 906          * We may come here right after calling schedule_user()
 907          * or do_notify_resume(), in which case we can be in RCU
 908          * user mode.
 909          */
 910         user_exit();
 911
 912         audit_syscall_exit(regs);
 913
 914         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
 915                 trace_sys_exit(regs, regs->regs[2]);
 916
 917         if (test_thread_flag(TIF_SYSCALL_TRACE))
 918                 tracehook_report_syscall_exit(regs, 0);
 919
 920         user_enter();
 921 }