arch/powerpc/kernel/ptrace.c

   1 /*
   2  *  PowerPC version
   3  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   4  *
   5  *  Derived from "arch/m68k/kernel/ptrace.c"
   6  *  Copyright (C) 1994 by Hamish Macdonald
   7  *  Taken from linux/kernel/ptrace.c and modified for M680x0.
   8  *  linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
   9  *
  10  * Modified by Cort Dougan (cort@hq.fsmlabs.com)
  11  * and Paul Mackerras (paulus@samba.org).
  12  *
  13  * This file is subject to the terms and conditions of the GNU General
  14  * Public License.  See the file README.legal in the main directory of
  15  * this archive for more details.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/mm.h>
  21 #include <linux/smp.h>
  22 #include <linux/errno.h>
  23 #include <linux/ptrace.h>
  24 #include <linux/regset.h>
  25 #include <linux/elf.h>
  26 #include <linux/user.h>
  27 #include <linux/security.h>
  28 #include <linux/signal.h>
  29 #include <linux/seccomp.h>
  30 #include <linux/audit.h>
  31 #ifdef CONFIG_PPC32
  32 #include <linux/module.h>
  33 #endif
  34
  35 #include <asm/uaccess.h>
  36 #include <asm/page.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/system.h>
  39
  40 /*
  41  * does not yet catch signals sent when the child dies.
  42  * in exit.c or in signal.c.
  43  */
  44
  45 /*
  46  * Set of msr bits that gdb can change on behalf of a process.
  47  */
  48 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
  49 #define MSR_DEBUGCHANGE 0
  50 #else
  51 #define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
  52 #endif
  53
  54 /*
  55  * Max register writeable via put_reg
  56  */
  57 #ifdef CONFIG_PPC32
  58 #define PT_MAX_PUT_REG  PT_MQ
  59 #else
  60 #define PT_MAX_PUT_REG  PT_CCR
  61 #endif
  62
  63 static unsigned long get_user_msr(struct task_struct *task)
  64 {
  65         return task->thread.regs->msr | task->thread.fpexc_mode;
  66 }
  67
  68 static int set_user_msr(struct task_struct *task, unsigned long msr)
  69 {
  70         task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
  71         task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
  72         return 0;
  73 }
  74
  75 /*
  76  * We prevent mucking around with the reserved area of trap
  77  * which are used internally by the kernel.
  78  */
  79 static int set_user_trap(struct task_struct *task, unsigned long trap)
  80 {
  81         task->thread.regs->trap = trap & 0xfff0;
  82         return 0;
  83 }
  84
  85 /*
  86  * Get contents of register REGNO in task TASK.
  87  */
  88 unsigned long ptrace_get_reg(struct task_struct *task, int regno)
  89 {
  90         if (task->thread.regs == NULL)
  91                 return -EIO;
  92
  93         if (regno == PT_MSR)
  94                 return get_user_msr(task);
  95
  96         if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
  97                 return ((unsigned long *)task->thread.regs)[regno];
  98
  99         return -EIO;
 100 }
 101
 102 /*
 103  * Write contents of register REGNO in task TASK.
 104  */
 105 int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
 106 {
 107         if (task->thread.regs == NULL)
 108                 return -EIO;
 109
 110         if (regno == PT_MSR)
 111                 return set_user_msr(task, data);
 112         if (regno == PT_TRAP)
 113                 return set_user_trap(task, data);
 114
 115         if (regno <= PT_MAX_PUT_REG) {
 116                 ((unsigned long *)task->thread.regs)[regno] = data;
 117                 return 0;
 118         }
 119         return -EIO;
 120 }
 121
 122 static int gpr_get(struct task_struct *target, const struct user_regset *regset,
 123                    unsigned int pos, unsigned int count,
 124                    void *kbuf, void __user *ubuf)
 125 {
 126         int ret;
 127
 128         if (target->thread.regs == NULL)
 129                 return -EIO;
 130
 131         CHECK_FULL_REGS(target->thread.regs);
 132
 133         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 134                                   target->thread.regs,
 135                                   0, offsetof(struct pt_regs, msr));
 136         if (!ret) {
 137                 unsigned long msr = get_user_msr(target);
 138                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &msr,
 139                                           offsetof(struct pt_regs, msr),
 140                                           offsetof(struct pt_regs, msr) +
 141                                           sizeof(msr));
 142         }
 143
 144         BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
 145                      offsetof(struct pt_regs, msr) + sizeof(long));
 146
 147         if (!ret)
 148                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 149                                           &target->thread.regs->orig_gpr3,
 150                                           offsetof(struct pt_regs, orig_gpr3),
 151                                           sizeof(struct pt_regs));
 152         if (!ret)
 153                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 154                                                sizeof(struct pt_regs), -1);
 155
 156         return ret;
 157 }
 158
 159 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
 160                    unsigned int pos, unsigned int count,
 161                    const void *kbuf, const void __user *ubuf)
 162 {
 163         unsigned long reg;
 164         int ret;
 165
 166         if (target->thread.regs == NULL)
 167                 return -EIO;
 168
 169         CHECK_FULL_REGS(target->thread.regs);
 170
 171         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 172                                  target->thread.regs,
 173                                  0, PT_MSR * sizeof(reg));
 174
 175         if (!ret && count > 0) {
 176                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
 177                                          PT_MSR * sizeof(reg),
 178                                          (PT_MSR + 1) * sizeof(reg));
 179                 if (!ret)
 180                         ret = set_user_msr(target, reg);
 181         }
 182
 183         BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
 184                      offsetof(struct pt_regs, msr) + sizeof(long));
 185
 186         if (!ret)
 187                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 188                                          &target->thread.regs->orig_gpr3,
 189                                          PT_ORIG_R3 * sizeof(reg),
 190                                          (PT_MAX_PUT_REG + 1) * sizeof(reg));
 191
 192         if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
 193                 ret = user_regset_copyin_ignore(
 194                         &pos, &count, &kbuf, &ubuf,
 195                         (PT_MAX_PUT_REG + 1) * sizeof(reg),
 196                         PT_TRAP * sizeof(reg));
 197
 198         if (!ret && count > 0) {
 199                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
 200                                          PT_TRAP * sizeof(reg),
 201                                          (PT_TRAP + 1) * sizeof(reg));
 202                 if (!ret)
 203                         ret = set_user_trap(target, reg);
 204         }
 205
 206         if (!ret)
 207                 ret = user_regset_copyin_ignore(
 208                         &pos, &count, &kbuf, &ubuf,
 209                         (PT_TRAP + 1) * sizeof(reg), -1);
 210
 211         return ret;
 212 }
 213
 214 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
 215                    unsigned int pos, unsigned int count,
 216                    void *kbuf, void __user *ubuf)
 217 {
 218         flush_fp_to_thread(target);
 219
 220         BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
 221                      offsetof(struct thread_struct, fpr[32]));
 222
 223         return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 224                                    &target->thread.fpr, 0, -1);
 225 }
 226
 227 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
 228                    unsigned int pos, unsigned int count,
 229                    const void *kbuf, const void __user *ubuf)
 230 {
 231         flush_fp_to_thread(target);
 232
 233         BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
 234                      offsetof(struct thread_struct, fpr[32]));
 235
 236         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 237                                   &target->thread.fpr, 0, -1);
 238 }
 239
 240
 241 #ifdef CONFIG_ALTIVEC
 242 /*
 243  * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
 244  * The transfer totals 34 quadword.  Quadwords 0-31 contain the
 245  * corresponding vector registers.  Quadword 32 contains the vscr as the
 246  * last word (offset 12) within that quadword.  Quadword 33 contains the
 247  * vrsave as the first word (offset 0) within the quadword.
 248  *
 249  * This definition of the VMX state is compatible with the current PPC32
 250  * ptrace interface.  This allows signal handling and ptrace to use the
 251  * same structures.  This also simplifies the implementation of a bi-arch
 252  * (combined (32- and 64-bit) gdb.
 253  */
 254
 255 static int vr_active(struct task_struct *target,
 256                      const struct user_regset *regset)
 257 {
 258         flush_altivec_to_thread(target);
 259         return target->thread.used_vr ? regset->n : 0;
 260 }
 261
 262 static int vr_get(struct task_struct *target, const struct user_regset *regset,
 263                   unsigned int pos, unsigned int count,
 264                   void *kbuf, void __user *ubuf)
 265 {
 266         int ret;
 267
 268         flush_altivec_to_thread(target);
 269
 270         BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
 271                      offsetof(struct thread_struct, vr[32]));
 272
 273         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 274                                   &target->thread.vr, 0,
 275                                   33 * sizeof(vector128));
 276         if (!ret) {
 277                 /*
 278                  * Copy out only the low-order word of vrsave.
 279                  */
 280                 union {
 281                         elf_vrreg_t reg;
 282                         u32 word;
 283                 } vrsave;
 284                 memset(&vrsave, 0, sizeof(vrsave));
 285                 vrsave.word = target->thread.vrsave;
 286                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
 287                                           33 * sizeof(vector128), -1);
 288         }
 289
 290         return ret;
 291 }
 292
 293 static int vr_set(struct task_struct *target, const struct user_regset *regset,
 294                   unsigned int pos, unsigned int count,
 295                   const void *kbuf, const void __user *ubuf)
 296 {
 297         int ret;
 298
 299         flush_altivec_to_thread(target);
 300
 301         BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
 302                      offsetof(struct thread_struct, vr[32]));
 303
 304         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 305                                  &target->thread.vr, 0, 33 * sizeof(vector128));
 306         if (!ret && count > 0) {
 307                 /*
 308                  * We use only the first word of vrsave.
 309                  */
 310                 union {
 311                         elf_vrreg_t reg;
 312                         u32 word;
 313                 } vrsave;
 314                 memset(&vrsave, 0, sizeof(vrsave));
 315                 vrsave.word = target->thread.vrsave;
 316                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
 317                                          33 * sizeof(vector128), -1);
 318                 if (!ret)
 319                         target->thread.vrsave = vrsave.word;
 320         }
 321
 322         return ret;
 323 }
 324 #endif /* CONFIG_ALTIVEC */
 325
 326 #ifdef CONFIG_SPE
 327
 328 /*
 329  * For get_evrregs/set_evrregs functions 'data' has the following layout:
 330  *
 331  * struct {
 332  *   u32 evr[32];
 333  *   u64 acc;
 334  *   u32 spefscr;
 335  * }
 336  */
 337
 338 static int evr_active(struct task_struct *target,
 339                       const struct user_regset *regset)
 340 {
 341         flush_spe_to_thread(target);
 342         return target->thread.used_spe ? regset->n : 0;
 343 }
 344
 345 static int evr_get(struct task_struct *target, const struct user_regset *regset,
 346                    unsigned int pos, unsigned int count,
 347                    void *kbuf, void __user *ubuf)
 348 {
 349         int ret;
 350
 351         flush_spe_to_thread(target);
 352
 353         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 354                                   &target->thread.evr,
 355                                   0, sizeof(target->thread.evr));
 356
 357         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
 358                      offsetof(struct thread_struct, spefscr));
 359
 360         if (!ret)
 361                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 362                                           &target->thread.acc,
 363                                           sizeof(target->thread.evr), -1);
 364
 365         return ret;
 366 }
 367
 368 static int evr_set(struct task_struct *target, const struct user_regset *regset,
 369                    unsigned int pos, unsigned int count,
 370                    const void *kbuf, const void __user *ubuf)
 371 {
 372         int ret;
 373
 374         flush_spe_to_thread(target);
 375
 376         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 377                                  &target->thread.evr,
 378                                  0, sizeof(target->thread.evr));
 379
 380         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
 381                      offsetof(struct thread_struct, spefscr));
 382
 383         if (!ret)
 384                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 385                                          &target->thread.acc,
 386                                          sizeof(target->thread.evr), -1);
 387
 388         return ret;
 389 }
 390 #endif /* CONFIG_SPE */
 391
 392
 393 /*
 394  * These are our native regset flavors.
 395  */
 396 enum powerpc_regset {
 397         REGSET_GPR,
 398         REGSET_FPR,
 399 #ifdef CONFIG_ALTIVEC
 400         REGSET_VMX,
 401 #endif
 402 #ifdef CONFIG_SPE
 403         REGSET_SPE,
 404 #endif
 405 };
 406
 407 static const struct user_regset native_regsets[] = {
 408         [REGSET_GPR] = {
 409                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 410                 .size = sizeof(long), .align = sizeof(long),
 411                 .get = gpr_get, .set = gpr_set
 412         },
 413         [REGSET_FPR] = {
 414                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 415                 .size = sizeof(double), .align = sizeof(double),
 416                 .get = fpr_get, .set = fpr_set
 417         },
 418 #ifdef CONFIG_ALTIVEC
 419         [REGSET_VMX] = {
 420                 .core_note_type = NT_PPC_VMX, .n = 34,
 421                 .size = sizeof(vector128), .align = sizeof(vector128),
 422                 .active = vr_active, .get = vr_get, .set = vr_set
 423         },
 424 #endif
 425 #ifdef CONFIG_SPE
 426         [REGSET_SPE] = {
 427                 .n = 35,
 428                 .size = sizeof(u32), .align = sizeof(u32),
 429                 .active = evr_active, .get = evr_get, .set = evr_set
 430         },
 431 #endif
 432 };
 433
 434 static const struct user_regset_view user_ppc_native_view = {
 435         .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
 436         .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
 437 };
 438
 439 #ifdef CONFIG_PPC64
 440 #include <linux/compat.h>
 441
 442 static int gpr32_get(struct task_struct *target,
 443                      const struct user_regset *regset,
 444                      unsigned int pos, unsigned int count,
 445                      void *kbuf, void __user *ubuf)
 446 {
 447         const unsigned long *regs = &target->thread.regs->gpr[0];
 448         compat_ulong_t *k = kbuf;
 449         compat_ulong_t __user *u = ubuf;
 450         compat_ulong_t reg;
 451
 452         if (target->thread.regs == NULL)
 453                 return -EIO;
 454
 455         CHECK_FULL_REGS(target->thread.regs);
 456
 457         pos /= sizeof(reg);
 458         count /= sizeof(reg);
 459
 460         if (kbuf)
 461                 for (; count > 0 && pos < PT_MSR; --count)
 462                         *k++ = regs[pos++];
 463         else
 464                 for (; count > 0 && pos < PT_MSR; --count)
 465                         if (__put_user((compat_ulong_t) regs[pos++], u++))
 466                                 return -EFAULT;
 467
 468         if (count > 0 && pos == PT_MSR) {
 469                 reg = get_user_msr(target);
 470                 if (kbuf)
 471                         *k++ = reg;
 472                 else if (__put_user(reg, u++))
 473                         return -EFAULT;
 474                 ++pos;
 475                 --count;
 476         }
 477
 478         if (kbuf)
 479                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
 480                         *k++ = regs[pos++];
 481         else
 482                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
 483                         if (__put_user((compat_ulong_t) regs[pos++], u++))
 484                                 return -EFAULT;
 485
 486         kbuf = k;
 487         ubuf = u;
 488         pos *= sizeof(reg);
 489         count *= sizeof(reg);
 490         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 491                                         PT_REGS_COUNT * sizeof(reg), -1);
 492 }
 493
 494 static int gpr32_set(struct task_struct *target,
 495                      const struct user_regset *regset,
 496                      unsigned int pos, unsigned int count,
 497                      const void *kbuf, const void __user *ubuf)
 498 {
 499         unsigned long *regs = &target->thread.regs->gpr[0];
 500         const compat_ulong_t *k = kbuf;
 501         const compat_ulong_t __user *u = ubuf;
 502         compat_ulong_t reg;
 503
 504         if (target->thread.regs == NULL)
 505                 return -EIO;
 506
 507         CHECK_FULL_REGS(target->thread.regs);
 508
 509         pos /= sizeof(reg);
 510         count /= sizeof(reg);
 511
 512         if (kbuf)
 513                 for (; count > 0 && pos < PT_MSR; --count)
 514                         regs[pos++] = *k++;
 515         else
 516                 for (; count > 0 && pos < PT_MSR; --count) {
 517                         if (__get_user(reg, u++))
 518                                 return -EFAULT;
 519                         regs[pos++] = reg;
 520                 }
 521
 522
 523         if (count > 0 && pos == PT_MSR) {
 524                 if (kbuf)
 525                         reg = *k++;
 526                 else if (__get_user(reg, u++))
 527                         return -EFAULT;
 528                 set_user_msr(target, reg);
 529                 ++pos;
 530                 --count;
 531         }
 532
 533         if (kbuf)
 534                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
 535                         regs[pos++] = *k++;
 536         else
 537                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
 538                         if (__get_user(reg, u++))
 539                                 return -EFAULT;
 540                         regs[pos++] = reg;
 541                 }
 542
 543         if (count > 0 && pos == PT_TRAP) {
 544                 if (kbuf)
 545                         reg = *k++;
 546                 else if (__get_user(reg, u++))
 547                         return -EFAULT;
 548                 set_user_trap(target, reg);
 549                 ++pos;
 550                 --count;
 551         }
 552
 553         kbuf = k;
 554         ubuf = u;
 555         pos *= sizeof(reg);
 556         count *= sizeof(reg);
 557         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 558                                          (PT_TRAP + 1) * sizeof(reg), -1);
 559 }
 560
 561 /*
 562  * These are the regset flavors matching the CONFIG_PPC32 native set.
 563  */
 564 static const struct user_regset compat_regsets[] = {
 565         [REGSET_GPR] = {
 566                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 567                 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
 568                 .get = gpr32_get, .set = gpr32_set
 569         },
 570         [REGSET_FPR] = {
 571                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 572                 .size = sizeof(double), .align = sizeof(double),
 573                 .get = fpr_get, .set = fpr_set
 574         },
 575 #ifdef CONFIG_ALTIVEC
 576         [REGSET_VMX] = {
 577                 .core_note_type = NT_PPC_VMX, .n = 34,
 578                 .size = sizeof(vector128), .align = sizeof(vector128),
 579                 .active = vr_active, .get = vr_get, .set = vr_set
 580         },
 581 #endif
 582 #ifdef CONFIG_SPE
 583         [REGSET_SPE] = {
 584                 .core_note_type = NT_PPC_SPE, .n = 35,
 585                 .size = sizeof(u32), .align = sizeof(u32),
 586                 .active = evr_active, .get = evr_get, .set = evr_set
 587         },
 588 #endif
 589 };
 590
 591 static const struct user_regset_view user_ppc_compat_view = {
 592         .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
 593         .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
 594 };
 595 #endif  /* CONFIG_PPC64 */
 596
 597 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 598 {
 599 #ifdef CONFIG_PPC64
 600         if (test_tsk_thread_flag(task, TIF_32BIT))
 601                 return &user_ppc_compat_view;
 602 #endif
 603         return &user_ppc_native_view;
 604 }
 605
 606
 607 void user_enable_single_step(struct task_struct *task)
 608 {
 609         struct pt_regs *regs = task->thread.regs;
 610
 611         if (regs != NULL) {
 612 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 613                 task->thread.dbcr0 = DBCR0_IDM | DBCR0_IC;
 614                 regs->msr |= MSR_DE;
 615 #else
 616                 regs->msr |= MSR_SE;
 617 #endif
 618         }
 619         set_tsk_thread_flag(task, TIF_SINGLESTEP);
 620 }
 621
 622 void user_disable_single_step(struct task_struct *task)
 623 {
 624         struct pt_regs *regs = task->thread.regs;
 625
 626         if (regs != NULL) {
 627 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 628                 task->thread.dbcr0 = 0;
 629                 regs->msr &= ~MSR_DE;
 630 #else
 631                 regs->msr &= ~MSR_SE;
 632 #endif
 633         }
 634         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
 635 }
 636
 637 static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
 638                                unsigned long data)
 639 {
 640         /* We only support one DABR and no IABRS at the moment */
 641         if (addr > 0)
 642                 return -EINVAL;
 643
 644         /* The bottom 3 bits are flags */
 645         if ((data & ~0x7UL) >= TASK_SIZE)
 646                 return -EIO;
 647
 648         /* Ensure translation is on */
 649         if (data && !(data & DABR_TRANSLATION))
 650                 return -EIO;
 651
 652         task->thread.dabr = data;
 653         return 0;
 654 }
 655
 656 /*
 657  * Called by kernel/ptrace.c when detaching..
 658  *
 659  * Make sure single step bits etc are not set.
 660  */
 661 void ptrace_disable(struct task_struct *child)
 662 {
 663         /* make sure the single step bit is not set. */
 664         user_disable_single_step(child);
 665 }
 666
 667 /*
 668  * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
 669  * we mark them as obsolete now, they will be removed in a future version
 670  */
 671 static long arch_ptrace_old(struct task_struct *child, long request, long addr,
 672                             long data)
 673 {
 674         switch (request) {
 675         case PPC_PTRACE_GETREGS:        /* Get GPRs 0 - 31. */
 676                 return copy_regset_to_user(child, &user_ppc_native_view,
 677                                            REGSET_GPR, 0, 32 * sizeof(long),
 678                                            (void __user *) data);
 679
 680         case PPC_PTRACE_SETREGS:        /* Set GPRs 0 - 31. */
 681                 return copy_regset_from_user(child, &user_ppc_native_view,
 682                                              REGSET_GPR, 0, 32 * sizeof(long),
 683                                              (const void __user *) data);
 684
 685         case PPC_PTRACE_GETFPREGS:      /* Get FPRs 0 - 31. */
 686                 return copy_regset_to_user(child, &user_ppc_native_view,
 687                                            REGSET_FPR, 0, 32 * sizeof(double),
 688                                            (void __user *) data);
 689
 690         case PPC_PTRACE_SETFPREGS:      /* Set FPRs 0 - 31. */
 691                 return copy_regset_from_user(child, &user_ppc_native_view,
 692                                              REGSET_FPR, 0, 32 * sizeof(double),
 693                                              (const void __user *) data);
 694         }
 695
 696         return -EPERM;
 697 }
 698
 699 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 700 {
 701         int ret = -EPERM;
 702
 703         switch (request) {
 704         /* read the word at location addr in the USER area. */
 705         case PTRACE_PEEKUSR: {
 706                 unsigned long index, tmp;
 707
 708                 ret = -EIO;
 709                 /* convert to index and check */
 710 #ifdef CONFIG_PPC32
 711                 index = (unsigned long) addr >> 2;
 712                 if ((addr & 3) || (index > PT_FPSCR)
 713                     || (child->thread.regs == NULL))
 714 #else
 715                 index = (unsigned long) addr >> 3;
 716                 if ((addr & 7) || (index > PT_FPSCR))
 717 #endif
 718                         break;
 719
 720                 CHECK_FULL_REGS(child->thread.regs);
 721                 if (index < PT_FPR0) {
 722                         tmp = ptrace_get_reg(child, (int) index);
 723                 } else {
 724                         flush_fp_to_thread(child);
 725                         tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
 726                 }
 727                 ret = put_user(tmp,(unsigned long __user *) data);
 728                 break;
 729         }
 730
 731         /* write the word at location addr in the USER area */
 732         case PTRACE_POKEUSR: {
 733                 unsigned long index;
 734
 735                 ret = -EIO;
 736                 /* convert to index and check */
 737 #ifdef CONFIG_PPC32
 738                 index = (unsigned long) addr >> 2;
 739                 if ((addr & 3) || (index > PT_FPSCR)
 740                     || (child->thread.regs == NULL))
 741 #else
 742                 index = (unsigned long) addr >> 3;
 743                 if ((addr & 7) || (index > PT_FPSCR))
 744 #endif
 745                         break;
 746
 747                 CHECK_FULL_REGS(child->thread.regs);
 748                 if (index < PT_FPR0) {
 749                         ret = ptrace_put_reg(child, index, data);
 750                 } else {
 751                         flush_fp_to_thread(child);
 752                         ((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;
 753                         ret = 0;
 754                 }
 755                 break;
 756         }
 757
 758         case PTRACE_GET_DEBUGREG: {
 759                 ret = -EINVAL;
 760                 /* We only support one DABR and no IABRS at the moment */
 761                 if (addr > 0)
 762                         break;
 763                 ret = put_user(child->thread.dabr,
 764                                (unsigned long __user *)data);
 765                 break;
 766         }
 767
 768         case PTRACE_SET_DEBUGREG:
 769                 ret = ptrace_set_debugreg(child, addr, data);
 770                 break;
 771
 772 #ifdef CONFIG_PPC64
 773         case PTRACE_GETREGS64:
 774 #endif
 775         case PTRACE_GETREGS:    /* Get all pt_regs from the child. */
 776                 return copy_regset_to_user(child, &user_ppc_native_view,
 777                                            REGSET_GPR,
 778                                            0, sizeof(struct pt_regs),
 779                                            (void __user *) data);
 780
 781 #ifdef CONFIG_PPC64
 782         case PTRACE_SETREGS64:
 783 #endif
 784         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
 785                 return copy_regset_from_user(child, &user_ppc_native_view,
 786                                              REGSET_GPR,
 787                                              0, sizeof(struct pt_regs),
 788                                              (const void __user *) data);
 789
 790         case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
 791                 return copy_regset_to_user(child, &user_ppc_native_view,
 792                                            REGSET_FPR,
 793                                            0, sizeof(elf_fpregset_t),
 794                                            (void __user *) data);
 795
 796         case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
 797                 return copy_regset_from_user(child, &user_ppc_native_view,
 798                                              REGSET_FPR,
 799                                              0, sizeof(elf_fpregset_t),
 800                                              (const void __user *) data);
 801
 802 #ifdef CONFIG_ALTIVEC
 803         case PTRACE_GETVRREGS:
 804                 return copy_regset_to_user(child, &user_ppc_native_view,
 805                                            REGSET_VMX,
 806                                            0, (33 * sizeof(vector128) +
 807                                                sizeof(u32)),
 808                                            (void __user *) data);
 809
 810         case PTRACE_SETVRREGS:
 811                 return copy_regset_from_user(child, &user_ppc_native_view,
 812                                              REGSET_VMX,
 813                                              0, (33 * sizeof(vector128) +
 814                                                  sizeof(u32)),
 815                                              (const void __user *) data);
 816 #endif
 817 #ifdef CONFIG_SPE
 818         case PTRACE_GETEVRREGS:
 819                 /* Get the child spe register state. */
 820                 return copy_regset_to_user(child, &user_ppc_native_view,
 821                                            REGSET_SPE, 0, 35 * sizeof(u32),
 822                                            (void __user *) data);
 823
 824         case PTRACE_SETEVRREGS:
 825                 /* Set the child spe register state. */
 826                 return copy_regset_from_user(child, &user_ppc_native_view,
 827                                              REGSET_SPE, 0, 35 * sizeof(u32),
 828                                              (const void __user *) data);
 829 #endif
 830
 831         /* Old reverse args ptrace callss */
 832         case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
 833         case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
 834         case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
 835         case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
 836                 ret = arch_ptrace_old(child, request, addr, data);
 837                 break;
 838
 839         default:
 840                 ret = ptrace_request(child, request, addr, data);
 841                 break;
 842         }
 843         return ret;
 844 }
 845
 846 static void do_syscall_trace(void)
 847 {
 848         /* the 0x80 provides a way for the tracing parent to distinguish
 849            between a syscall stop and SIGTRAP delivery */
 850         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 851                                  ? 0x80 : 0));
 852
 853         /*
 854          * this isn't the same as continuing with a signal, but it will do
 855          * for normal use.  strace only continues with a signal if the
 856          * stopping signal is not SIGTRAP.  -brl
 857          */
 858         if (current->exit_code) {
 859                 send_sig(current->exit_code, current, 1);
 860                 current->exit_code = 0;
 861         }
 862 }
 863
 864 void do_syscall_trace_enter(struct pt_regs *regs)
 865 {
 866         secure_computing(regs->gpr[0]);
 867
 868         if (test_thread_flag(TIF_SYSCALL_TRACE)
 869             && (current->ptrace & PT_PTRACED))
 870                 do_syscall_trace();
 871
 872         if (unlikely(current->audit_context)) {
 873 #ifdef CONFIG_PPC64
 874                 if (!test_thread_flag(TIF_32BIT))
 875                         audit_syscall_entry(AUDIT_ARCH_PPC64,
 876                                             regs->gpr[0],
 877                                             regs->gpr[3], regs->gpr[4],
 878                                             regs->gpr[5], regs->gpr[6]);
 879                 else
 880 #endif
 881                         audit_syscall_entry(AUDIT_ARCH_PPC,
 882                                             regs->gpr[0],
 883                                             regs->gpr[3] & 0xffffffff,
 884                                             regs->gpr[4] & 0xffffffff,
 885                                             regs->gpr[5] & 0xffffffff,
 886                                             regs->gpr[6] & 0xffffffff);
 887         }
 888 }
 889
 890 void do_syscall_trace_leave(struct pt_regs *regs)
 891 {
 892         if (unlikely(current->audit_context))
 893                 audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
 894                                    regs->result);
 895
 896         if ((test_thread_flag(TIF_SYSCALL_TRACE)
 897              || test_thread_flag(TIF_SINGLESTEP))
 898             && (current->ptrace & PT_PTRACED))
 899                 do_syscall_trace();
 900 }