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/tracehook.h>
  29 #include <linux/audit.h>
  30 #include <linux/seccomp.h>
  31 #include <linux/ftrace.h>
  32
  33 #include <asm/byteorder.h>
  34 #include <asm/cpu.h>
  35 #include <asm/cpu-info.h>
  36 #include <asm/dsp.h>
  37 #include <asm/fpu.h>
  38 #include <asm/mipsregs.h>
  39 #include <asm/mipsmtregs.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/page.h>
  42 #include <asm/syscall.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/bootinfo.h>
  45 #include <asm/reg.h>
  46
  47 #define CREATE_TRACE_POINTS
  48 #include <trace/events/syscalls.h>
  49
  50 static void init_fp_ctx(struct task_struct *target)
  51 {
  52         /* If FP has been used then the target already has context */
  53         if (tsk_used_math(target))
  54                 return;
  55
  56         /* Begin with data registers set to all 1s... */
  57         memset(&target->thread.fpu.fpr, ~0, sizeof(target->thread.fpu.fpr));
  58
  59         /* ...and FCSR zeroed */
  60         target->thread.fpu.fcr31 = 0;
  61
  62         /*
  63          * Record that the target has "used" math, such that the context
  64          * just initialised, and any modifications made by the caller,
  65          * aren't discarded.
  66          */
  67         set_stopped_child_used_math(target);
  68 }
  69
  70 /*
  71  * Called by kernel/ptrace.c when detaching..
  72  *
  73  * Make sure single step bits etc are not set.
  74  */
  75 void ptrace_disable(struct task_struct *child)
  76 {
  77         /* Don't load the watchpoint registers for the ex-child. */
  78         clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
  79 }
  80
  81 /*
  82  * Read a general register set.  We always use the 64-bit format, even
  83  * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
  84  * Registers are sign extended to fill the available space.
  85  */
  86 int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data)
  87 {
  88         struct pt_regs *regs;
  89         int i;
  90
  91         if (!access_ok(VERIFY_WRITE, data, 38 * 8))
  92                 return -EIO;
  93
  94         regs = task_pt_regs(child);
  95
  96         for (i = 0; i < 32; i++)
  97                 __put_user((long)regs->regs[i], (__s64 __user *)&data->regs[i]);
  98         __put_user((long)regs->lo, (__s64 __user *)&data->lo);
  99         __put_user((long)regs->hi, (__s64 __user *)&data->hi);
 100         __put_user((long)regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
 101         __put_user((long)regs->cp0_badvaddr, (__s64 __user *)&data->cp0_badvaddr);
 102         __put_user((long)regs->cp0_status, (__s64 __user *)&data->cp0_status);
 103         __put_user((long)regs->cp0_cause, (__s64 __user *)&data->cp0_cause);
 104
 105         return 0;
 106 }
 107
 108 /*
 109  * Write a general register set.  As for PTRACE_GETREGS, we always use
 110  * the 64-bit format.  On a 32-bit kernel only the lower order half
 111  * (according to endianness) will be used.
 112  */
 113 int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data)
 114 {
 115         struct pt_regs *regs;
 116         int i;
 117
 118         if (!access_ok(VERIFY_READ, data, 38 * 8))
 119                 return -EIO;
 120
 121         regs = task_pt_regs(child);
 122
 123         for (i = 0; i < 32; i++)
 124                 __get_user(regs->regs[i], (__s64 __user *)&data->regs[i]);
 125         __get_user(regs->lo, (__s64 __user *)&data->lo);
 126         __get_user(regs->hi, (__s64 __user *)&data->hi);
 127         __get_user(regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
 128
 129         /* badvaddr, status, and cause may not be written.  */
 130
 131         return 0;
 132 }
 133
 134 int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
 135 {
 136         int i;
 137
 138         if (!access_ok(VERIFY_WRITE, data, 33 * 8))
 139                 return -EIO;
 140
 141         if (tsk_used_math(child)) {
 142                 union fpureg *fregs = get_fpu_regs(child);
 143                 for (i = 0; i < 32; i++)
 144                         __put_user(get_fpr64(&fregs[i], 0),
 145                                    i + (__u64 __user *)data);
 146         } else {
 147                 for (i = 0; i < 32; i++)
 148                         __put_user((__u64) -1, i + (__u64 __user *) data);
 149         }
 150
 151         __put_user(child->thread.fpu.fcr31, data + 64);
 152         __put_user(boot_cpu_data.fpu_id, data + 65);
 153
 154         return 0;
 155 }
 156
 157 int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
 158 {
 159         union fpureg *fregs;
 160         u64 fpr_val;
 161         u32 fcr31;
 162         u32 value;
 163         u32 mask;
 164         int i;
 165
 166         if (!access_ok(VERIFY_READ, data, 33 * 8))
 167                 return -EIO;
 168
 169         init_fp_ctx(child);
 170         fregs = get_fpu_regs(child);
 171
 172         for (i = 0; i < 32; i++) {
 173                 __get_user(fpr_val, i + (__u64 __user *)data);
 174                 set_fpr64(&fregs[i], 0, fpr_val);
 175         }
 176
 177         __get_user(value, data + 64);
 178         fcr31 = child->thread.fpu.fcr31;
 179         mask = current_cpu_data.fpu_msk31;
 180         child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask);
 181
 182         /* FIR may not be written.  */
 183
 184         return 0;
 185 }
 186
 187 int ptrace_get_watch_regs(struct task_struct *child,
 188                           struct pt_watch_regs __user *addr)
 189 {
 190         enum pt_watch_style style;
 191         int i;
 192
 193         if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
 194                 return -EIO;
 195         if (!access_ok(VERIFY_WRITE, addr, sizeof(struct pt_watch_regs)))
 196                 return -EIO;
 197
 198 #ifdef CONFIG_32BIT
 199         style = pt_watch_style_mips32;
 200 #define WATCH_STYLE mips32
 201 #else
 202         style = pt_watch_style_mips64;
 203 #define WATCH_STYLE mips64
 204 #endif
 205
 206         __put_user(style, &addr->style);
 207         __put_user(boot_cpu_data.watch_reg_use_cnt,
 208                    &addr->WATCH_STYLE.num_valid);
 209         for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
 210                 __put_user(child->thread.watch.mips3264.watchlo[i],
 211                            &addr->WATCH_STYLE.watchlo[i]);
 212                 __put_user(child->thread.watch.mips3264.watchhi[i] & 0xfff,
 213                            &addr->WATCH_STYLE.watchhi[i]);
 214                 __put_user(boot_cpu_data.watch_reg_masks[i],
 215                            &addr->WATCH_STYLE.watch_masks[i]);
 216         }
 217         for (; i < 8; i++) {
 218                 __put_user(0, &addr->WATCH_STYLE.watchlo[i]);
 219                 __put_user(0, &addr->WATCH_STYLE.watchhi[i]);
 220                 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]);
 221         }
 222
 223         return 0;
 224 }
 225
 226 int ptrace_set_watch_regs(struct task_struct *child,
 227                           struct pt_watch_regs __user *addr)
 228 {
 229         int i;
 230         int watch_active = 0;
 231         unsigned long lt[NUM_WATCH_REGS];
 232         u16 ht[NUM_WATCH_REGS];
 233
 234         if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
 235                 return -EIO;
 236         if (!access_ok(VERIFY_READ, addr, sizeof(struct pt_watch_regs)))
 237                 return -EIO;
 238         /* Check the values. */
 239         for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
 240                 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]);
 241 #ifdef CONFIG_32BIT
 242                 if (lt[i] & __UA_LIMIT)
 243                         return -EINVAL;
 244 #else
 245                 if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) {
 246                         if (lt[i] & 0xffffffff80000000UL)
 247                                 return -EINVAL;
 248                 } else {
 249                         if (lt[i] & __UA_LIMIT)
 250                                 return -EINVAL;
 251                 }
 252 #endif
 253                 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
 254                 if (ht[i] & ~0xff8)
 255                         return -EINVAL;
 256         }
 257         /* Install them. */
 258         for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
 259                 if (lt[i] & 7)
 260                         watch_active = 1;
 261                 child->thread.watch.mips3264.watchlo[i] = lt[i];
 262                 /* Set the G bit. */
 263                 child->thread.watch.mips3264.watchhi[i] = ht[i];
 264         }
 265
 266         if (watch_active)
 267                 set_tsk_thread_flag(child, TIF_LOAD_WATCH);
 268         else
 269                 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
 270
 271         return 0;
 272 }
 273
 274 /* regset get/set implementations */
 275
 276 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
 277
 278 static int gpr32_get(struct task_struct *target,
 279                      const struct user_regset *regset,
 280                      unsigned int pos, unsigned int count,
 281                      void *kbuf, void __user *ubuf)
 282 {
 283         struct pt_regs *regs = task_pt_regs(target);
 284         u32 uregs[ELF_NGREG] = {};
 285         unsigned i;
 286
 287         for (i = MIPS32_EF_R1; i <= MIPS32_EF_R31; i++) {
 288                 /* k0/k1 are copied as zero. */
 289                 if (i == MIPS32_EF_R26 || i == MIPS32_EF_R27)
 290                         continue;
 291
 292                 uregs[i] = regs->regs[i - MIPS32_EF_R0];
 293         }
 294
 295         uregs[MIPS32_EF_LO] = regs->lo;
 296         uregs[MIPS32_EF_HI] = regs->hi;
 297         uregs[MIPS32_EF_CP0_EPC] = regs->cp0_epc;
 298         uregs[MIPS32_EF_CP0_BADVADDR] = regs->cp0_badvaddr;
 299         uregs[MIPS32_EF_CP0_STATUS] = regs->cp0_status;
 300         uregs[MIPS32_EF_CP0_CAUSE] = regs->cp0_cause;
 301
 302         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
 303                                    sizeof(uregs));
 304 }
 305
 306 static int gpr32_set(struct task_struct *target,
 307                      const struct user_regset *regset,
 308                      unsigned int pos, unsigned int count,
 309                      const void *kbuf, const void __user *ubuf)
 310 {
 311         struct pt_regs *regs = task_pt_regs(target);
 312         u32 uregs[ELF_NGREG];
 313         unsigned start, num_regs, i;
 314         int err;
 315
 316         start = pos / sizeof(u32);
 317         num_regs = count / sizeof(u32);
 318
 319         if (start + num_regs > ELF_NGREG)
 320                 return -EIO;
 321
 322         err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
 323                                  sizeof(uregs));
 324         if (err)
 325                 return err;
 326
 327         for (i = start; i < num_regs; i++) {
 328                 /*
 329                  * Cast all values to signed here so that if this is a 64-bit
 330                  * kernel, the supplied 32-bit values will be sign extended.
 331                  */
 332                 switch (i) {
 333                 case MIPS32_EF_R1 ... MIPS32_EF_R25:
 334                         /* k0/k1 are ignored. */
 335                 case MIPS32_EF_R28 ... MIPS32_EF_R31:
 336                         regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i];
 337                         break;
 338                 case MIPS32_EF_LO:
 339                         regs->lo = (s32)uregs[i];
 340                         break;
 341                 case MIPS32_EF_HI:
 342                         regs->hi = (s32)uregs[i];
 343                         break;
 344                 case MIPS32_EF_CP0_EPC:
 345                         regs->cp0_epc = (s32)uregs[i];
 346                         break;
 347                 }
 348         }
 349
 350         return 0;
 351 }
 352
 353 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
 354
 355 #ifdef CONFIG_64BIT
 356
 357 static int gpr64_get(struct task_struct *target,
 358                      const struct user_regset *regset,
 359                      unsigned int pos, unsigned int count,
 360                      void *kbuf, void __user *ubuf)
 361 {
 362         struct pt_regs *regs = task_pt_regs(target);
 363         u64 uregs[ELF_NGREG] = {};
 364         unsigned i;
 365
 366         for (i = MIPS64_EF_R1; i <= MIPS64_EF_R31; i++) {
 367                 /* k0/k1 are copied as zero. */
 368                 if (i == MIPS64_EF_R26 || i == MIPS64_EF_R27)
 369                         continue;
 370
 371                 uregs[i] = regs->regs[i - MIPS64_EF_R0];
 372         }
 373
 374         uregs[MIPS64_EF_LO] = regs->lo;
 375         uregs[MIPS64_EF_HI] = regs->hi;
 376         uregs[MIPS64_EF_CP0_EPC] = regs->cp0_epc;
 377         uregs[MIPS64_EF_CP0_BADVADDR] = regs->cp0_badvaddr;
 378         uregs[MIPS64_EF_CP0_STATUS] = regs->cp0_status;
 379         uregs[MIPS64_EF_CP0_CAUSE] = regs->cp0_cause;
 380
 381         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
 382                                    sizeof(uregs));
 383 }
 384
 385 static int gpr64_set(struct task_struct *target,
 386                      const struct user_regset *regset,
 387                      unsigned int pos, unsigned int count,
 388                      const void *kbuf, const void __user *ubuf)
 389 {
 390         struct pt_regs *regs = task_pt_regs(target);
 391         u64 uregs[ELF_NGREG];
 392         unsigned start, num_regs, i;
 393         int err;
 394
 395         start = pos / sizeof(u64);
 396         num_regs = count / sizeof(u64);
 397
 398         if (start + num_regs > ELF_NGREG)
 399                 return -EIO;
 400
 401         err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
 402                                  sizeof(uregs));
 403         if (err)
 404                 return err;
 405
 406         for (i = start; i < num_regs; i++) {
 407                 switch (i) {
 408                 case MIPS64_EF_R1 ... MIPS64_EF_R25:
 409                         /* k0/k1 are ignored. */
 410                 case MIPS64_EF_R28 ... MIPS64_EF_R31:
 411                         regs->regs[i - MIPS64_EF_R0] = uregs[i];
 412                         break;
 413                 case MIPS64_EF_LO:
 414                         regs->lo = uregs[i];
 415                         break;
 416                 case MIPS64_EF_HI:
 417                         regs->hi = uregs[i];
 418                         break;
 419                 case MIPS64_EF_CP0_EPC:
 420                         regs->cp0_epc = uregs[i];
 421                         break;
 422                 }
 423         }
 424
 425         return 0;
 426 }
 427
 428 #endif /* CONFIG_64BIT */
 429
 430 static int fpr_get(struct task_struct *target,
 431                    const struct user_regset *regset,
 432                    unsigned int pos, unsigned int count,
 433                    void *kbuf, void __user *ubuf)
 434 {
 435         unsigned i;
 436         int err;
 437         u64 fpr_val;
 438
 439         /* XXX fcr31  */
 440
 441         if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
 442                 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 443                                            &target->thread.fpu,
 444                                            0, sizeof(elf_fpregset_t));
 445
 446         for (i = 0; i < NUM_FPU_REGS; i++) {
 447                 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
 448                 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 449                                           &fpr_val, i * sizeof(elf_fpreg_t),
 450                                           (i + 1) * sizeof(elf_fpreg_t));
 451                 if (err)
 452                         return err;
 453         }
 454
 455         return 0;
 456 }
 457
 458 static int fpr_set(struct task_struct *target,
 459                    const struct user_regset *regset,
 460                    unsigned int pos, unsigned int count,
 461                    const void *kbuf, const void __user *ubuf)
 462 {
 463         unsigned i;
 464         int err;
 465         u64 fpr_val;
 466
 467         /* XXX fcr31  */
 468
 469         init_fp_ctx(target);
 470
 471         if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
 472                 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 473                                           &target->thread.fpu,
 474                                           0, sizeof(elf_fpregset_t));
 475
 476         for (i = 0; i < NUM_FPU_REGS; i++) {
 477                 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 478                                          &fpr_val, i * sizeof(elf_fpreg_t),
 479                                          (i + 1) * sizeof(elf_fpreg_t));
 480                 if (err)
 481                         return err;
 482                 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
 483         }
 484
 485         return 0;
 486 }
 487
 488 enum mips_regset {
 489         REGSET_GPR,
 490         REGSET_FPR,
 491 };
 492
 493 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
 494
 495 static const struct user_regset mips_regsets[] = {
 496         [REGSET_GPR] = {
 497                 .core_note_type = NT_PRSTATUS,
 498                 .n              = ELF_NGREG,
 499                 .size           = sizeof(unsigned int),
 500                 .align          = sizeof(unsigned int),
 501                 .get            = gpr32_get,
 502                 .set            = gpr32_set,
 503         },
 504         [REGSET_FPR] = {
 505                 .core_note_type = NT_PRFPREG,
 506                 .n              = ELF_NFPREG,
 507                 .size           = sizeof(elf_fpreg_t),
 508                 .align          = sizeof(elf_fpreg_t),
 509                 .get            = fpr_get,
 510                 .set            = fpr_set,
 511         },
 512 };
 513
 514 static const struct user_regset_view user_mips_view = {
 515         .name           = "mips",
 516         .e_machine      = ELF_ARCH,
 517         .ei_osabi       = ELF_OSABI,
 518         .regsets        = mips_regsets,
 519         .n              = ARRAY_SIZE(mips_regsets),
 520 };
 521
 522 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
 523
 524 #ifdef CONFIG_64BIT
 525
 526 static const struct user_regset mips64_regsets[] = {
 527         [REGSET_GPR] = {
 528                 .core_note_type = NT_PRSTATUS,
 529                 .n              = ELF_NGREG,
 530                 .size           = sizeof(unsigned long),
 531                 .align          = sizeof(unsigned long),
 532                 .get            = gpr64_get,
 533                 .set            = gpr64_set,
 534         },
 535         [REGSET_FPR] = {
 536                 .core_note_type = NT_PRFPREG,
 537                 .n              = ELF_NFPREG,
 538                 .size           = sizeof(elf_fpreg_t),
 539                 .align          = sizeof(elf_fpreg_t),
 540                 .get            = fpr_get,
 541                 .set            = fpr_set,
 542         },
 543 };
 544
 545 static const struct user_regset_view user_mips64_view = {
 546         .name           = "mips64",
 547         .e_machine      = ELF_ARCH,
 548         .ei_osabi       = ELF_OSABI,
 549         .regsets        = mips64_regsets,
 550         .n              = ARRAY_SIZE(mips64_regsets),
 551 };
 552
 553 #endif /* CONFIG_64BIT */
 554
 555 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 556 {
 557 #ifdef CONFIG_32BIT
 558         return &user_mips_view;
 559 #else
 560 #ifdef CONFIG_MIPS32_O32
 561         if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
 562                 return &user_mips_view;
 563 #endif
 564         return &user_mips64_view;
 565 #endif
 566 }
 567
 568 long arch_ptrace(struct task_struct *child, long request,
 569                  unsigned long addr, unsigned long data)
 570 {
 571         int ret;
 572         void __user *addrp = (void __user *) addr;
 573         void __user *datavp = (void __user *) data;
 574         unsigned long __user *datalp = (void __user *) data;
 575
 576         switch (request) {
 577         /* when I and D space are separate, these will need to be fixed. */
 578         case PTRACE_PEEKTEXT: /* read word at location addr. */
 579         case PTRACE_PEEKDATA:
 580                 ret = generic_ptrace_peekdata(child, addr, data);
 581                 break;
 582
 583         /* Read the word at location addr in the USER area. */
 584         case PTRACE_PEEKUSR: {
 585                 struct pt_regs *regs;
 586                 union fpureg *fregs;
 587                 unsigned long tmp = 0;
 588
 589                 regs = task_pt_regs(child);
 590                 ret = 0;  /* Default return value. */
 591
 592                 switch (addr) {
 593                 case 0 ... 31:
 594                         tmp = regs->regs[addr];
 595                         break;
 596                 case FPR_BASE ... FPR_BASE + 31:
 597                         if (!tsk_used_math(child)) {
 598                                 /* FP not yet used */
 599                                 tmp = -1;
 600                                 break;
 601                         }
 602                         fregs = get_fpu_regs(child);
 603
 604 #ifdef CONFIG_32BIT
 605                         if (test_thread_flag(TIF_32BIT_FPREGS)) {
 606                                 /*
 607                                  * The odd registers are actually the high
 608                                  * order bits of the values stored in the even
 609                                  * registers - unless we're using r2k_switch.S.
 610                                  */
 611                                 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
 612                                                 addr & 1);
 613                                 break;
 614                         }
 615 #endif
 616                         tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
 617                         break;
 618                 case PC:
 619                         tmp = regs->cp0_epc;
 620                         break;
 621                 case CAUSE:
 622                         tmp = regs->cp0_cause;
 623                         break;
 624                 case BADVADDR:
 625                         tmp = regs->cp0_badvaddr;
 626                         break;
 627                 case MMHI:
 628                         tmp = regs->hi;
 629                         break;
 630                 case MMLO:
 631                         tmp = regs->lo;
 632                         break;
 633 #ifdef CONFIG_CPU_HAS_SMARTMIPS
 634                 case ACX:
 635                         tmp = regs->acx;
 636                         break;
 637 #endif
 638                 case FPC_CSR:
 639                         tmp = child->thread.fpu.fcr31;
 640                         break;
 641                 case FPC_EIR:
 642                         /* implementation / version register */
 643                         tmp = boot_cpu_data.fpu_id;
 644                         break;
 645                 case DSP_BASE ... DSP_BASE + 5: {
 646                         dspreg_t *dregs;
 647
 648                         if (!cpu_has_dsp) {
 649                                 tmp = 0;
 650                                 ret = -EIO;
 651                                 goto out;
 652                         }
 653                         dregs = __get_dsp_regs(child);
 654                         tmp = (unsigned long) (dregs[addr - DSP_BASE]);
 655                         break;
 656                 }
 657                 case DSP_CONTROL:
 658                         if (!cpu_has_dsp) {
 659                                 tmp = 0;
 660                                 ret = -EIO;
 661                                 goto out;
 662                         }
 663                         tmp = child->thread.dsp.dspcontrol;
 664                         break;
 665                 default:
 666                         tmp = 0;
 667                         ret = -EIO;
 668                         goto out;
 669                 }
 670                 ret = put_user(tmp, datalp);
 671                 break;
 672         }
 673
 674         /* when I and D space are separate, this will have to be fixed. */
 675         case PTRACE_POKETEXT: /* write the word at location addr. */
 676         case PTRACE_POKEDATA:
 677                 ret = generic_ptrace_pokedata(child, addr, data);
 678                 break;
 679
 680         case PTRACE_POKEUSR: {
 681                 struct pt_regs *regs;
 682                 ret = 0;
 683                 regs = task_pt_regs(child);
 684
 685                 switch (addr) {
 686                 case 0 ... 31:
 687                         regs->regs[addr] = data;
 688                         break;
 689                 case FPR_BASE ... FPR_BASE + 31: {
 690                         union fpureg *fregs = get_fpu_regs(child);
 691
 692                         init_fp_ctx(child);
 693 #ifdef CONFIG_32BIT
 694                         if (test_thread_flag(TIF_32BIT_FPREGS)) {
 695                                 /*
 696                                  * The odd registers are actually the high
 697                                  * order bits of the values stored in the even
 698                                  * registers - unless we're using r2k_switch.S.
 699                                  */
 700                                 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
 701                                           addr & 1, data);
 702                                 break;
 703                         }
 704 #endif
 705                         set_fpr64(&fregs[addr - FPR_BASE], 0, data);
 706                         break;
 707                 }
 708                 case PC:
 709                         regs->cp0_epc = data;
 710                         break;
 711                 case MMHI:
 712                         regs->hi = data;
 713                         break;
 714                 case MMLO:
 715                         regs->lo = data;
 716                         break;
 717 #ifdef CONFIG_CPU_HAS_SMARTMIPS
 718                 case ACX:
 719                         regs->acx = data;
 720                         break;
 721 #endif
 722                 case FPC_CSR:
 723                         child->thread.fpu.fcr31 = data & ~FPU_CSR_ALL_X;
 724                         break;
 725                 case DSP_BASE ... DSP_BASE + 5: {
 726                         dspreg_t *dregs;
 727
 728                         if (!cpu_has_dsp) {
 729                                 ret = -EIO;
 730                                 break;
 731                         }
 732
 733                         dregs = __get_dsp_regs(child);
 734                         dregs[addr - DSP_BASE] = data;
 735                         break;
 736                 }
 737                 case DSP_CONTROL:
 738                         if (!cpu_has_dsp) {
 739                                 ret = -EIO;
 740                                 break;
 741                         }
 742                         child->thread.dsp.dspcontrol = data;
 743                         break;
 744                 default:
 745                         /* The rest are not allowed. */
 746                         ret = -EIO;
 747                         break;
 748                 }
 749                 break;
 750                 }
 751
 752         case PTRACE_GETREGS:
 753                 ret = ptrace_getregs(child, datavp);
 754                 break;
 755
 756         case PTRACE_SETREGS:
 757                 ret = ptrace_setregs(child, datavp);
 758                 break;
 759
 760         case PTRACE_GETFPREGS:
 761                 ret = ptrace_getfpregs(child, datavp);
 762                 break;
 763
 764         case PTRACE_SETFPREGS:
 765                 ret = ptrace_setfpregs(child, datavp);
 766                 break;
 767
 768         case PTRACE_GET_THREAD_AREA:
 769                 ret = put_user(task_thread_info(child)->tp_value, datalp);
 770                 break;
 771
 772         case PTRACE_GET_WATCH_REGS:
 773                 ret = ptrace_get_watch_regs(child, addrp);
 774                 break;
 775
 776         case PTRACE_SET_WATCH_REGS:
 777                 ret = ptrace_set_watch_regs(child, addrp);
 778                 break;
 779
 780         default:
 781                 ret = ptrace_request(child, request, addr, data);
 782                 break;
 783         }
 784  out:
 785         return ret;
 786 }
 787
 788 /*
 789  * Notification of system call entry/exit
 790  * - triggered by current->work.syscall_trace
 791  */
 792 asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
 793 {
 794         long ret = 0;
 795         user_exit();
 796
 797         current_thread_info()->syscall = syscall;
 798
 799         if (secure_computing() == -1)
 800                 return -1;
 801
 802         if (test_thread_flag(TIF_SYSCALL_TRACE) &&
 803             tracehook_report_syscall_entry(regs))
 804                 ret = -1;
 805
 806         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
 807                 trace_sys_enter(regs, regs->regs[2]);
 808
 809         audit_syscall_entry(syscall, regs->regs[4], regs->regs[5],
 810                             regs->regs[6], regs->regs[7]);
 811         return syscall;
 812 }
 813
 814 /*
 815  * Notification of system call entry/exit
 816  * - triggered by current->work.syscall_trace
 817  */
 818 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
 819 {
 820         /*
 821          * We may come here right after calling schedule_user()
 822          * or do_notify_resume(), in which case we can be in RCU
 823          * user mode.
 824          */
 825         user_exit();
 826
 827         audit_syscall_exit(regs);
 828
 829         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
 830                 trace_sys_exit(regs, regs->regs[2]);
 831
 832         if (test_thread_flag(TIF_SYSCALL_TRACE))
 833                 tracehook_report_syscall_exit(regs, 0);
 834
 835         user_enter();
 836 }