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