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 #ifdef CONFIG_VSX
 219         double buf[33];
 220         int i;
 221 #endif
 222         flush_fp_to_thread(target);
 223
 224 #ifdef CONFIG_VSX
 225         /* copy to local buffer then write that out */
 226         for (i = 0; i < 32 ; i++)
 227                 buf[i] = target->thread.TS_FPR(i);
 228         memcpy(&buf[32], &target->thread.fpscr, sizeof(double));
 229         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
 230
 231 #else
 232         BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
 233                      offsetof(struct thread_struct, TS_FPR(32)));
 234
 235         return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 236                                    &target->thread.fpr, 0, -1);
 237 #endif
 238 }
 239
 240 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
 241                    unsigned int pos, unsigned int count,
 242                    const void *kbuf, const void __user *ubuf)
 243 {
 244 #ifdef CONFIG_VSX
 245         double buf[33];
 246         int i;
 247 #endif
 248         flush_fp_to_thread(target);
 249
 250 #ifdef CONFIG_VSX
 251         /* copy to local buffer then write that out */
 252         i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
 253         if (i)
 254                 return i;
 255         for (i = 0; i < 32 ; i++)
 256                 target->thread.TS_FPR(i) = buf[i];
 257         memcpy(&target->thread.fpscr, &buf[32], sizeof(double));
 258         return 0;
 259 #else
 260         BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
 261                      offsetof(struct thread_struct, TS_FPR(32)));
 262
 263         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 264                                   &target->thread.fpr, 0, -1);
 265 #endif
 266 }
 267
 268 #ifdef CONFIG_ALTIVEC
 269 /*
 270  * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
 271  * The transfer totals 34 quadword.  Quadwords 0-31 contain the
 272  * corresponding vector registers.  Quadword 32 contains the vscr as the
 273  * last word (offset 12) within that quadword.  Quadword 33 contains the
 274  * vrsave as the first word (offset 0) within the quadword.
 275  *
 276  * This definition of the VMX state is compatible with the current PPC32
 277  * ptrace interface.  This allows signal handling and ptrace to use the
 278  * same structures.  This also simplifies the implementation of a bi-arch
 279  * (combined (32- and 64-bit) gdb.
 280  */
 281
 282 static int vr_active(struct task_struct *target,
 283                      const struct user_regset *regset)
 284 {
 285         flush_altivec_to_thread(target);
 286         return target->thread.used_vr ? regset->n : 0;
 287 }
 288
 289 static int vr_get(struct task_struct *target, const struct user_regset *regset,
 290                   unsigned int pos, unsigned int count,
 291                   void *kbuf, void __user *ubuf)
 292 {
 293         int ret;
 294
 295         flush_altivec_to_thread(target);
 296
 297         BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
 298                      offsetof(struct thread_struct, vr[32]));
 299
 300         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 301                                   &target->thread.vr, 0,
 302                                   33 * sizeof(vector128));
 303         if (!ret) {
 304                 /*
 305                  * Copy out only the low-order word of vrsave.
 306                  */
 307                 union {
 308                         elf_vrreg_t reg;
 309                         u32 word;
 310                 } vrsave;
 311                 memset(&vrsave, 0, sizeof(vrsave));
 312                 vrsave.word = target->thread.vrsave;
 313                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
 314                                           33 * sizeof(vector128), -1);
 315         }
 316
 317         return ret;
 318 }
 319
 320 static int vr_set(struct task_struct *target, const struct user_regset *regset,
 321                   unsigned int pos, unsigned int count,
 322                   const void *kbuf, const void __user *ubuf)
 323 {
 324         int ret;
 325
 326         flush_altivec_to_thread(target);
 327
 328         BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
 329                      offsetof(struct thread_struct, vr[32]));
 330
 331         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 332                                  &target->thread.vr, 0, 33 * sizeof(vector128));
 333         if (!ret && count > 0) {
 334                 /*
 335                  * We use only the first word of vrsave.
 336                  */
 337                 union {
 338                         elf_vrreg_t reg;
 339                         u32 word;
 340                 } vrsave;
 341                 memset(&vrsave, 0, sizeof(vrsave));
 342                 vrsave.word = target->thread.vrsave;
 343                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
 344                                          33 * sizeof(vector128), -1);
 345                 if (!ret)
 346                         target->thread.vrsave = vrsave.word;
 347         }
 348
 349         return ret;
 350 }
 351 #endif /* CONFIG_ALTIVEC */
 352
 353 #ifdef CONFIG_VSX
 354 /*
 355  * Currently to set and and get all the vsx state, you need to call
 356  * the fp and VMX calls aswell.  This only get/sets the lower 32
 357  * 128bit VSX registers.
 358  */
 359
 360 static int vsr_active(struct task_struct *target,
 361                       const struct user_regset *regset)
 362 {
 363         flush_vsx_to_thread(target);
 364         return target->thread.used_vsr ? regset->n : 0;
 365 }
 366
 367 static int vsr_get(struct task_struct *target, const struct user_regset *regset,
 368                    unsigned int pos, unsigned int count,
 369                    void *kbuf, void __user *ubuf)
 370 {
 371         int ret;
 372
 373         flush_vsx_to_thread(target);
 374
 375         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 376                                   target->thread.fpr, 0,
 377                                   32 * sizeof(vector128));
 378
 379         return ret;
 380 }
 381
 382 static int vsr_set(struct task_struct *target, const struct user_regset *regset,
 383                    unsigned int pos, unsigned int count,
 384                    const void *kbuf, const void __user *ubuf)
 385 {
 386         int ret;
 387
 388         flush_vsx_to_thread(target);
 389
 390         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 391                                  target->thread.fpr, 0,
 392                                  32 * sizeof(vector128));
 393
 394         return ret;
 395 }
 396 #endif /* CONFIG_VSX */
 397
 398 #ifdef CONFIG_SPE
 399
 400 /*
 401  * For get_evrregs/set_evrregs functions 'data' has the following layout:
 402  *
 403  * struct {
 404  *   u32 evr[32];
 405  *   u64 acc;
 406  *   u32 spefscr;
 407  * }
 408  */
 409
 410 static int evr_active(struct task_struct *target,
 411                       const struct user_regset *regset)
 412 {
 413         flush_spe_to_thread(target);
 414         return target->thread.used_spe ? regset->n : 0;
 415 }
 416
 417 static int evr_get(struct task_struct *target, const struct user_regset *regset,
 418                    unsigned int pos, unsigned int count,
 419                    void *kbuf, void __user *ubuf)
 420 {
 421         int ret;
 422
 423         flush_spe_to_thread(target);
 424
 425         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 426                                   &target->thread.evr,
 427                                   0, sizeof(target->thread.evr));
 428
 429         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
 430                      offsetof(struct thread_struct, spefscr));
 431
 432         if (!ret)
 433                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 434                                           &target->thread.acc,
 435                                           sizeof(target->thread.evr), -1);
 436
 437         return ret;
 438 }
 439
 440 static int evr_set(struct task_struct *target, const struct user_regset *regset,
 441                    unsigned int pos, unsigned int count,
 442                    const void *kbuf, const void __user *ubuf)
 443 {
 444         int ret;
 445
 446         flush_spe_to_thread(target);
 447
 448         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 449                                  &target->thread.evr,
 450                                  0, sizeof(target->thread.evr));
 451
 452         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
 453                      offsetof(struct thread_struct, spefscr));
 454
 455         if (!ret)
 456                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 457                                          &target->thread.acc,
 458                                          sizeof(target->thread.evr), -1);
 459
 460         return ret;
 461 }
 462 #endif /* CONFIG_SPE */
 463
 464
 465 /*
 466  * These are our native regset flavors.
 467  */
 468 enum powerpc_regset {
 469         REGSET_GPR,
 470         REGSET_FPR,
 471 #ifdef CONFIG_ALTIVEC
 472         REGSET_VMX,
 473 #endif
 474 #ifdef CONFIG_VSX
 475         REGSET_VSX,
 476 #endif
 477 #ifdef CONFIG_SPE
 478         REGSET_SPE,
 479 #endif
 480 };
 481
 482 static const struct user_regset native_regsets[] = {
 483         [REGSET_GPR] = {
 484                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 485                 .size = sizeof(long), .align = sizeof(long),
 486                 .get = gpr_get, .set = gpr_set
 487         },
 488         [REGSET_FPR] = {
 489                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 490                 .size = sizeof(double), .align = sizeof(double),
 491                 .get = fpr_get, .set = fpr_set
 492         },
 493 #ifdef CONFIG_ALTIVEC
 494         [REGSET_VMX] = {
 495                 .core_note_type = NT_PPC_VMX, .n = 34,
 496                 .size = sizeof(vector128), .align = sizeof(vector128),
 497                 .active = vr_active, .get = vr_get, .set = vr_set
 498         },
 499 #endif
 500 #ifdef CONFIG_VSX
 501         [REGSET_VSX] = {
 502                 .n = 32,
 503                 .size = sizeof(vector128), .align = sizeof(vector128),
 504                 .active = vsr_active, .get = vsr_get, .set = vsr_set
 505         },
 506 #endif
 507 #ifdef CONFIG_SPE
 508         [REGSET_SPE] = {
 509                 .n = 35,
 510                 .size = sizeof(u32), .align = sizeof(u32),
 511                 .active = evr_active, .get = evr_get, .set = evr_set
 512         },
 513 #endif
 514 };
 515
 516 static const struct user_regset_view user_ppc_native_view = {
 517         .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
 518         .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
 519 };
 520
 521 #ifdef CONFIG_PPC64
 522 #include <linux/compat.h>
 523
 524 static int gpr32_get(struct task_struct *target,
 525                      const struct user_regset *regset,
 526                      unsigned int pos, unsigned int count,
 527                      void *kbuf, void __user *ubuf)
 528 {
 529         const unsigned long *regs = &target->thread.regs->gpr[0];
 530         compat_ulong_t *k = kbuf;
 531         compat_ulong_t __user *u = ubuf;
 532         compat_ulong_t reg;
 533
 534         if (target->thread.regs == NULL)
 535                 return -EIO;
 536
 537         CHECK_FULL_REGS(target->thread.regs);
 538
 539         pos /= sizeof(reg);
 540         count /= sizeof(reg);
 541
 542         if (kbuf)
 543                 for (; count > 0 && pos < PT_MSR; --count)
 544                         *k++ = regs[pos++];
 545         else
 546                 for (; count > 0 && pos < PT_MSR; --count)
 547                         if (__put_user((compat_ulong_t) regs[pos++], u++))
 548                                 return -EFAULT;
 549
 550         if (count > 0 && pos == PT_MSR) {
 551                 reg = get_user_msr(target);
 552                 if (kbuf)
 553                         *k++ = reg;
 554                 else if (__put_user(reg, u++))
 555                         return -EFAULT;
 556                 ++pos;
 557                 --count;
 558         }
 559
 560         if (kbuf)
 561                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
 562                         *k++ = regs[pos++];
 563         else
 564                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
 565                         if (__put_user((compat_ulong_t) regs[pos++], u++))
 566                                 return -EFAULT;
 567
 568         kbuf = k;
 569         ubuf = u;
 570         pos *= sizeof(reg);
 571         count *= sizeof(reg);
 572         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 573                                         PT_REGS_COUNT * sizeof(reg), -1);
 574 }
 575
 576 static int gpr32_set(struct task_struct *target,
 577                      const struct user_regset *regset,
 578                      unsigned int pos, unsigned int count,
 579                      const void *kbuf, const void __user *ubuf)
 580 {
 581         unsigned long *regs = &target->thread.regs->gpr[0];
 582         const compat_ulong_t *k = kbuf;
 583         const compat_ulong_t __user *u = ubuf;
 584         compat_ulong_t reg;
 585
 586         if (target->thread.regs == NULL)
 587                 return -EIO;
 588
 589         CHECK_FULL_REGS(target->thread.regs);
 590
 591         pos /= sizeof(reg);
 592         count /= sizeof(reg);
 593
 594         if (kbuf)
 595                 for (; count > 0 && pos < PT_MSR; --count)
 596                         regs[pos++] = *k++;
 597         else
 598                 for (; count > 0 && pos < PT_MSR; --count) {
 599                         if (__get_user(reg, u++))
 600                                 return -EFAULT;
 601                         regs[pos++] = reg;
 602                 }
 603
 604
 605         if (count > 0 && pos == PT_MSR) {
 606                 if (kbuf)
 607                         reg = *k++;
 608                 else if (__get_user(reg, u++))
 609                         return -EFAULT;
 610                 set_user_msr(target, reg);
 611                 ++pos;
 612                 --count;
 613         }
 614
 615         if (kbuf) {
 616                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
 617                         regs[pos++] = *k++;
 618                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
 619                         ++k;
 620         } else {
 621                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
 622                         if (__get_user(reg, u++))
 623                                 return -EFAULT;
 624                         regs[pos++] = reg;
 625                 }
 626                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
 627                         if (__get_user(reg, u++))
 628                                 return -EFAULT;
 629         }
 630
 631         if (count > 0 && pos == PT_TRAP) {
 632                 if (kbuf)
 633                         reg = *k++;
 634                 else if (__get_user(reg, u++))
 635                         return -EFAULT;
 636                 set_user_trap(target, reg);
 637                 ++pos;
 638                 --count;
 639         }
 640
 641         kbuf = k;
 642         ubuf = u;
 643         pos *= sizeof(reg);
 644         count *= sizeof(reg);
 645         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 646                                          (PT_TRAP + 1) * sizeof(reg), -1);
 647 }
 648
 649 /*
 650  * These are the regset flavors matching the CONFIG_PPC32 native set.
 651  */
 652 static const struct user_regset compat_regsets[] = {
 653         [REGSET_GPR] = {
 654                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 655                 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
 656                 .get = gpr32_get, .set = gpr32_set
 657         },
 658         [REGSET_FPR] = {
 659                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 660                 .size = sizeof(double), .align = sizeof(double),
 661                 .get = fpr_get, .set = fpr_set
 662         },
 663 #ifdef CONFIG_ALTIVEC
 664         [REGSET_VMX] = {
 665                 .core_note_type = NT_PPC_VMX, .n = 34,
 666                 .size = sizeof(vector128), .align = sizeof(vector128),
 667                 .active = vr_active, .get = vr_get, .set = vr_set
 668         },
 669 #endif
 670 #ifdef CONFIG_SPE
 671         [REGSET_SPE] = {
 672                 .core_note_type = NT_PPC_SPE, .n = 35,
 673                 .size = sizeof(u32), .align = sizeof(u32),
 674                 .active = evr_active, .get = evr_get, .set = evr_set
 675         },
 676 #endif
 677 };
 678
 679 static const struct user_regset_view user_ppc_compat_view = {
 680         .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
 681         .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
 682 };
 683 #endif  /* CONFIG_PPC64 */
 684
 685 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 686 {
 687 #ifdef CONFIG_PPC64
 688         if (test_tsk_thread_flag(task, TIF_32BIT))
 689                 return &user_ppc_compat_view;
 690 #endif
 691         return &user_ppc_native_view;
 692 }
 693
 694
 695 void user_enable_single_step(struct task_struct *task)
 696 {
 697         struct pt_regs *regs = task->thread.regs;
 698
 699         if (regs != NULL) {
 700 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 701                 task->thread.dbcr0 = DBCR0_IDM | DBCR0_IC;
 702                 regs->msr |= MSR_DE;
 703 #else
 704                 regs->msr |= MSR_SE;
 705 #endif
 706         }
 707         set_tsk_thread_flag(task, TIF_SINGLESTEP);
 708 }
 709
 710 void user_disable_single_step(struct task_struct *task)
 711 {
 712         struct pt_regs *regs = task->thread.regs;
 713
 714         if (regs != NULL) {
 715 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 716                 task->thread.dbcr0 = 0;
 717                 regs->msr &= ~MSR_DE;
 718 #else
 719                 regs->msr &= ~MSR_SE;
 720 #endif
 721         }
 722         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
 723 }
 724
 725 static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
 726                                unsigned long data)
 727 {
 728         /* We only support one DABR and no IABRS at the moment */
 729         if (addr > 0)
 730                 return -EINVAL;
 731
 732         /* The bottom 3 bits are flags */
 733         if ((data & ~0x7UL) >= TASK_SIZE)
 734                 return -EIO;
 735
 736         /* Ensure translation is on */
 737         if (data && !(data & DABR_TRANSLATION))
 738                 return -EIO;
 739
 740         task->thread.dabr = data;
 741         return 0;
 742 }
 743
 744 /*
 745  * Called by kernel/ptrace.c when detaching..
 746  *
 747  * Make sure single step bits etc are not set.
 748  */
 749 void ptrace_disable(struct task_struct *child)
 750 {
 751         /* make sure the single step bit is not set. */
 752         user_disable_single_step(child);
 753 }
 754
 755 /*
 756  * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
 757  * we mark them as obsolete now, they will be removed in a future version
 758  */
 759 static long arch_ptrace_old(struct task_struct *child, long request, long addr,
 760                             long data)
 761 {
 762         switch (request) {
 763         case PPC_PTRACE_GETREGS:        /* Get GPRs 0 - 31. */
 764                 return copy_regset_to_user(child, &user_ppc_native_view,
 765                                            REGSET_GPR, 0, 32 * sizeof(long),
 766                                            (void __user *) data);
 767
 768         case PPC_PTRACE_SETREGS:        /* Set GPRs 0 - 31. */
 769                 return copy_regset_from_user(child, &user_ppc_native_view,
 770                                              REGSET_GPR, 0, 32 * sizeof(long),
 771                                              (const void __user *) data);
 772
 773         case PPC_PTRACE_GETFPREGS:      /* Get FPRs 0 - 31. */
 774                 return copy_regset_to_user(child, &user_ppc_native_view,
 775                                            REGSET_FPR, 0, 32 * sizeof(double),
 776                                            (void __user *) data);
 777
 778         case PPC_PTRACE_SETFPREGS:      /* Set FPRs 0 - 31. */
 779                 return copy_regset_from_user(child, &user_ppc_native_view,
 780                                              REGSET_FPR, 0, 32 * sizeof(double),
 781                                              (const void __user *) data);
 782         }
 783
 784         return -EPERM;
 785 }
 786
 787 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 788 {
 789         int ret = -EPERM;
 790
 791         switch (request) {
 792         /* read the word at location addr in the USER area. */
 793         case PTRACE_PEEKUSR: {
 794                 unsigned long index, tmp;
 795
 796                 ret = -EIO;
 797                 /* convert to index and check */
 798 #ifdef CONFIG_PPC32
 799                 index = (unsigned long) addr >> 2;
 800                 if ((addr & 3) || (index > PT_FPSCR)
 801                     || (child->thread.regs == NULL))
 802 #else
 803                 index = (unsigned long) addr >> 3;
 804                 if ((addr & 7) || (index > PT_FPSCR))
 805 #endif
 806                         break;
 807
 808                 CHECK_FULL_REGS(child->thread.regs);
 809                 if (index < PT_FPR0) {
 810                         tmp = ptrace_get_reg(child, (int) index);
 811                 } else {
 812                         flush_fp_to_thread(child);
 813                         tmp = ((unsigned long *)child->thread.fpr)
 814                                 [TS_FPRWIDTH * (index - PT_FPR0)];
 815                 }
 816                 ret = put_user(tmp,(unsigned long __user *) data);
 817                 break;
 818         }
 819
 820         /* write the word at location addr in the USER area */
 821         case PTRACE_POKEUSR: {
 822                 unsigned long index;
 823
 824                 ret = -EIO;
 825                 /* convert to index and check */
 826 #ifdef CONFIG_PPC32
 827                 index = (unsigned long) addr >> 2;
 828                 if ((addr & 3) || (index > PT_FPSCR)
 829                     || (child->thread.regs == NULL))
 830 #else
 831                 index = (unsigned long) addr >> 3;
 832                 if ((addr & 7) || (index > PT_FPSCR))
 833 #endif
 834                         break;
 835
 836                 CHECK_FULL_REGS(child->thread.regs);
 837                 if (index < PT_FPR0) {
 838                         ret = ptrace_put_reg(child, index, data);
 839                 } else {
 840                         flush_fp_to_thread(child);
 841                         ((unsigned long *)child->thread.fpr)
 842                                 [TS_FPRWIDTH * (index - PT_FPR0)] = data;
 843                         ret = 0;
 844                 }
 845                 break;
 846         }
 847
 848         case PTRACE_GET_DEBUGREG: {
 849                 ret = -EINVAL;
 850                 /* We only support one DABR and no IABRS at the moment */
 851                 if (addr > 0)
 852                         break;
 853                 ret = put_user(child->thread.dabr,
 854                                (unsigned long __user *)data);
 855                 break;
 856         }
 857
 858         case PTRACE_SET_DEBUGREG:
 859                 ret = ptrace_set_debugreg(child, addr, data);
 860                 break;
 861
 862 #ifdef CONFIG_PPC64
 863         case PTRACE_GETREGS64:
 864 #endif
 865         case PTRACE_GETREGS:    /* Get all pt_regs from the child. */
 866                 return copy_regset_to_user(child, &user_ppc_native_view,
 867                                            REGSET_GPR,
 868                                            0, sizeof(struct pt_regs),
 869                                            (void __user *) data);
 870
 871 #ifdef CONFIG_PPC64
 872         case PTRACE_SETREGS64:
 873 #endif
 874         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
 875                 return copy_regset_from_user(child, &user_ppc_native_view,
 876                                              REGSET_GPR,
 877                                              0, sizeof(struct pt_regs),
 878                                              (const void __user *) data);
 879
 880         case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
 881                 return copy_regset_to_user(child, &user_ppc_native_view,
 882                                            REGSET_FPR,
 883                                            0, sizeof(elf_fpregset_t),
 884                                            (void __user *) data);
 885
 886         case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
 887                 return copy_regset_from_user(child, &user_ppc_native_view,
 888                                              REGSET_FPR,
 889                                              0, sizeof(elf_fpregset_t),
 890                                              (const void __user *) data);
 891
 892 #ifdef CONFIG_ALTIVEC
 893         case PTRACE_GETVRREGS:
 894                 return copy_regset_to_user(child, &user_ppc_native_view,
 895                                            REGSET_VMX,
 896                                            0, (33 * sizeof(vector128) +
 897                                                sizeof(u32)),
 898                                            (void __user *) data);
 899
 900         case PTRACE_SETVRREGS:
 901                 return copy_regset_from_user(child, &user_ppc_native_view,
 902                                              REGSET_VMX,
 903                                              0, (33 * sizeof(vector128) +
 904                                                  sizeof(u32)),
 905                                              (const void __user *) data);
 906 #endif
 907 #ifdef CONFIG_VSX
 908         case PTRACE_GETVSRREGS:
 909                 return copy_regset_to_user(child, &user_ppc_native_view,
 910                                            REGSET_VSX,
 911                                            0, (32 * sizeof(vector128) +
 912                                                sizeof(u32)),
 913                                            (void __user *) data);
 914
 915         case PTRACE_SETVSRREGS:
 916                 return copy_regset_from_user(child, &user_ppc_native_view,
 917                                              REGSET_VSX,
 918                                              0, (32 * sizeof(vector128) +
 919                                                  sizeof(u32)),
 920                                              (const void __user *) data);
 921 #endif
 922 #ifdef CONFIG_SPE
 923         case PTRACE_GETEVRREGS:
 924                 /* Get the child spe register state. */
 925                 return copy_regset_to_user(child, &user_ppc_native_view,
 926                                            REGSET_SPE, 0, 35 * sizeof(u32),
 927                                            (void __user *) data);
 928
 929         case PTRACE_SETEVRREGS:
 930                 /* Set the child spe register state. */
 931                 return copy_regset_from_user(child, &user_ppc_native_view,
 932                                              REGSET_SPE, 0, 35 * sizeof(u32),
 933                                              (const void __user *) data);
 934 #endif
 935
 936         /* Old reverse args ptrace callss */
 937         case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
 938         case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
 939         case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
 940         case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
 941                 ret = arch_ptrace_old(child, request, addr, data);
 942                 break;
 943
 944         default:
 945                 ret = ptrace_request(child, request, addr, data);
 946                 break;
 947         }
 948         return ret;
 949 }
 950
 951 static void do_syscall_trace(void)
 952 {
 953         /* the 0x80 provides a way for the tracing parent to distinguish
 954            between a syscall stop and SIGTRAP delivery */
 955         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 956                                  ? 0x80 : 0));
 957
 958         /*
 959          * this isn't the same as continuing with a signal, but it will do
 960          * for normal use.  strace only continues with a signal if the
 961          * stopping signal is not SIGTRAP.  -brl
 962          */
 963         if (current->exit_code) {
 964                 send_sig(current->exit_code, current, 1);
 965                 current->exit_code = 0;
 966         }
 967 }
 968
 969 void do_syscall_trace_enter(struct pt_regs *regs)
 970 {
 971         secure_computing(regs->gpr[0]);
 972
 973         if (test_thread_flag(TIF_SYSCALL_TRACE)
 974             && (current->ptrace & PT_PTRACED))
 975                 do_syscall_trace();
 976
 977         if (unlikely(current->audit_context)) {
 978 #ifdef CONFIG_PPC64
 979                 if (!test_thread_flag(TIF_32BIT))
 980                         audit_syscall_entry(AUDIT_ARCH_PPC64,
 981                                             regs->gpr[0],
 982                                             regs->gpr[3], regs->gpr[4],
 983                                             regs->gpr[5], regs->gpr[6]);
 984                 else
 985 #endif
 986                         audit_syscall_entry(AUDIT_ARCH_PPC,
 987                                             regs->gpr[0],
 988                                             regs->gpr[3] & 0xffffffff,
 989                                             regs->gpr[4] & 0xffffffff,
 990                                             regs->gpr[5] & 0xffffffff,
 991                                             regs->gpr[6] & 0xffffffff);
 992         }
 993 }
 994
 995 void do_syscall_trace_leave(struct pt_regs *regs)
 996 {
 997         if (unlikely(current->audit_context))
 998                 audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
 999                                    regs->result);
1000
1001         if ((test_thread_flag(TIF_SYSCALL_TRACE)
1002              || test_thread_flag(TIF_SINGLESTEP))
1003             && (current->ptrace & PT_PTRACED))
1004                 do_syscall_trace();
1005 }