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