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