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/tracehook.h>
  26 #include <linux/elf.h>
  27 #include <linux/user.h>
  28 #include <linux/security.h>
  29 #include <linux/signal.h>
  30 #include <linux/seccomp.h>
  31 #include <linux/audit.h>
  32 #ifdef CONFIG_PPC32
  33 #include <linux/module.h>
  34 #endif
  35
  36 #include <asm/uaccess.h>
  37 #include <asm/page.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/system.h>
  40
  41 /*
  42  * does not yet catch signals sent when the child dies.
  43  * in exit.c or in signal.c.
  44  */
  45
  46 /*
  47  * Set of msr bits that gdb can change on behalf of a process.
  48  */
  49 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
  50 #define MSR_DEBUGCHANGE 0
  51 #else
  52 #define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
  53 #endif
  54
  55 /*
  56  * Max register writeable via put_reg
  57  */
  58 #ifdef CONFIG_PPC32
  59 #define PT_MAX_PUT_REG  PT_MQ
  60 #else
  61 #define PT_MAX_PUT_REG  PT_CCR
  62 #endif
  63
  64 static unsigned long get_user_msr(struct task_struct *task)
  65 {
  66         return task->thread.regs->msr | task->thread.fpexc_mode;
  67 }
  68
  69 static int set_user_msr(struct task_struct *task, unsigned long msr)
  70 {
  71         task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
  72         task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
  73         return 0;
  74 }
  75
  76 /*
  77  * We prevent mucking around with the reserved area of trap
  78  * which are used internally by the kernel.
  79  */
  80 static int set_user_trap(struct task_struct *task, unsigned long trap)
  81 {
  82         task->thread.regs->trap = trap & 0xfff0;
  83         return 0;
  84 }
  85
  86 /*
  87  * Get contents of register REGNO in task TASK.
  88  */
  89 unsigned long ptrace_get_reg(struct task_struct *task, int regno)
  90 {
  91         if (task->thread.regs == NULL)
  92                 return -EIO;
  93
  94         if (regno == PT_MSR)
  95                 return get_user_msr(task);
  96
  97         if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
  98                 return ((unsigned long *)task->thread.regs)[regno];
  99
 100         return -EIO;
 101 }
 102
 103 /*
 104  * Write contents of register REGNO in task TASK.
 105  */
 106 int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
 107 {
 108         if (task->thread.regs == NULL)
 109                 return -EIO;
 110
 111         if (regno == PT_MSR)
 112                 return set_user_msr(task, data);
 113         if (regno == PT_TRAP)
 114                 return set_user_trap(task, data);
 115
 116         if (regno <= PT_MAX_PUT_REG) {
 117                 ((unsigned long *)task->thread.regs)[regno] = data;
 118                 return 0;
 119         }
 120         return -EIO;
 121 }
 122
 123 static int gpr_get(struct task_struct *target, const struct user_regset *regset,
 124                    unsigned int pos, unsigned int count,
 125                    void *kbuf, void __user *ubuf)
 126 {
 127         int ret;
 128
 129         if (target->thread.regs == NULL)
 130                 return -EIO;
 131
 132         CHECK_FULL_REGS(target->thread.regs);
 133
 134         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 135                                   target->thread.regs,
 136                                   0, offsetof(struct pt_regs, msr));
 137         if (!ret) {
 138                 unsigned long msr = get_user_msr(target);
 139                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &msr,
 140                                           offsetof(struct pt_regs, msr),
 141                                           offsetof(struct pt_regs, msr) +
 142                                           sizeof(msr));
 143         }
 144
 145         BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
 146                      offsetof(struct pt_regs, msr) + sizeof(long));
 147
 148         if (!ret)
 149                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 150                                           &target->thread.regs->orig_gpr3,
 151                                           offsetof(struct pt_regs, orig_gpr3),
 152                                           sizeof(struct pt_regs));
 153         if (!ret)
 154                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 155                                                sizeof(struct pt_regs), -1);
 156
 157         return ret;
 158 }
 159
 160 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
 161                    unsigned int pos, unsigned int count,
 162                    const void *kbuf, const void __user *ubuf)
 163 {
 164         unsigned long reg;
 165         int ret;
 166
 167         if (target->thread.regs == NULL)
 168                 return -EIO;
 169
 170         CHECK_FULL_REGS(target->thread.regs);
 171
 172         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 173                                  target->thread.regs,
 174                                  0, PT_MSR * sizeof(reg));
 175
 176         if (!ret && count > 0) {
 177                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
 178                                          PT_MSR * sizeof(reg),
 179                                          (PT_MSR + 1) * sizeof(reg));
 180                 if (!ret)
 181                         ret = set_user_msr(target, reg);
 182         }
 183
 184         BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
 185                      offsetof(struct pt_regs, msr) + sizeof(long));
 186
 187         if (!ret)
 188                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 189                                          &target->thread.regs->orig_gpr3,
 190                                          PT_ORIG_R3 * sizeof(reg),
 191                                          (PT_MAX_PUT_REG + 1) * sizeof(reg));
 192
 193         if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
 194                 ret = user_regset_copyin_ignore(
 195                         &pos, &count, &kbuf, &ubuf,
 196                         (PT_MAX_PUT_REG + 1) * sizeof(reg),
 197                         PT_TRAP * sizeof(reg));
 198
 199         if (!ret && count > 0) {
 200                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
 201                                          PT_TRAP * sizeof(reg),
 202                                          (PT_TRAP + 1) * sizeof(reg));
 203                 if (!ret)
 204                         ret = set_user_trap(target, reg);
 205         }
 206
 207         if (!ret)
 208                 ret = user_regset_copyin_ignore(
 209                         &pos, &count, &kbuf, &ubuf,
 210                         (PT_TRAP + 1) * sizeof(reg), -1);
 211
 212         return ret;
 213 }
 214
 215 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
 216                    unsigned int pos, unsigned int count,
 217                    void *kbuf, void __user *ubuf)
 218 {
 219 #ifdef CONFIG_VSX
 220         double buf[33];
 221         int i;
 222 #endif
 223         flush_fp_to_thread(target);
 224
 225 #ifdef CONFIG_VSX
 226         /* copy to local buffer then write that out */
 227         for (i = 0; i < 32 ; i++)
 228                 buf[i] = target->thread.TS_FPR(i);
 229         memcpy(&buf[32], &target->thread.fpscr, sizeof(double));
 230         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
 231
 232 #else
 233         BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
 234                      offsetof(struct thread_struct, TS_FPR(32)));
 235
 236         return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 237                                    &target->thread.fpr, 0, -1);
 238 #endif
 239 }
 240
 241 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
 242                    unsigned int pos, unsigned int count,
 243                    const void *kbuf, const void __user *ubuf)
 244 {
 245 #ifdef CONFIG_VSX
 246         double buf[33];
 247         int i;
 248 #endif
 249         flush_fp_to_thread(target);
 250
 251 #ifdef CONFIG_VSX
 252         /* copy to local buffer then write that out */
 253         i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
 254         if (i)
 255                 return i;
 256         for (i = 0; i < 32 ; i++)
 257                 target->thread.TS_FPR(i) = buf[i];
 258         memcpy(&target->thread.fpscr, &buf[32], sizeof(double));
 259         return 0;
 260 #else
 261         BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
 262                      offsetof(struct thread_struct, TS_FPR(32)));
 263
 264         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 265                                   &target->thread.fpr, 0, -1);
 266 #endif
 267 }
 268
 269 #ifdef CONFIG_ALTIVEC
 270 /*
 271  * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
 272  * The transfer totals 34 quadword.  Quadwords 0-31 contain the
 273  * corresponding vector registers.  Quadword 32 contains the vscr as the
 274  * last word (offset 12) within that quadword.  Quadword 33 contains the
 275  * vrsave as the first word (offset 0) within the quadword.
 276  *
 277  * This definition of the VMX state is compatible with the current PPC32
 278  * ptrace interface.  This allows signal handling and ptrace to use the
 279  * same structures.  This also simplifies the implementation of a bi-arch
 280  * (combined (32- and 64-bit) gdb.
 281  */
 282
 283 static int vr_active(struct task_struct *target,
 284                      const struct user_regset *regset)
 285 {
 286         flush_altivec_to_thread(target);
 287         return target->thread.used_vr ? regset->n : 0;
 288 }
 289
 290 static int vr_get(struct task_struct *target, const struct user_regset *regset,
 291                   unsigned int pos, unsigned int count,
 292                   void *kbuf, void __user *ubuf)
 293 {
 294         int ret;
 295
 296         flush_altivec_to_thread(target);
 297
 298         BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
 299                      offsetof(struct thread_struct, vr[32]));
 300
 301         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 302                                   &target->thread.vr, 0,
 303                                   33 * sizeof(vector128));
 304         if (!ret) {
 305                 /*
 306                  * Copy out only the low-order word of vrsave.
 307                  */
 308                 union {
 309                         elf_vrreg_t reg;
 310                         u32 word;
 311                 } vrsave;
 312                 memset(&vrsave, 0, sizeof(vrsave));
 313                 vrsave.word = target->thread.vrsave;
 314                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
 315                                           33 * sizeof(vector128), -1);
 316         }
 317
 318         return ret;
 319 }
 320
 321 static int vr_set(struct task_struct *target, const struct user_regset *regset,
 322                   unsigned int pos, unsigned int count,
 323                   const void *kbuf, const void __user *ubuf)
 324 {
 325         int ret;
 326
 327         flush_altivec_to_thread(target);
 328
 329         BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
 330                      offsetof(struct thread_struct, vr[32]));
 331
 332         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 333                                  &target->thread.vr, 0, 33 * sizeof(vector128));
 334         if (!ret && count > 0) {
 335                 /*
 336                  * We use only the first word of vrsave.
 337                  */
 338                 union {
 339                         elf_vrreg_t reg;
 340                         u32 word;
 341                 } vrsave;
 342                 memset(&vrsave, 0, sizeof(vrsave));
 343                 vrsave.word = target->thread.vrsave;
 344                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
 345                                          33 * sizeof(vector128), -1);
 346                 if (!ret)
 347                         target->thread.vrsave = vrsave.word;
 348         }
 349
 350         return ret;
 351 }
 352 #endif /* CONFIG_ALTIVEC */
 353
 354 #ifdef CONFIG_VSX
 355 /*
 356  * Currently to set and and get all the vsx state, you need to call
 357  * the fp and VMX calls aswell.  This only get/sets the lower 32
 358  * 128bit VSX registers.
 359  */
 360
 361 static int vsr_active(struct task_struct *target,
 362                       const struct user_regset *regset)
 363 {
 364         flush_vsx_to_thread(target);
 365         return target->thread.used_vsr ? regset->n : 0;
 366 }
 367
 368 static int vsr_get(struct task_struct *target, const struct user_regset *regset,
 369                    unsigned int pos, unsigned int count,
 370                    void *kbuf, void __user *ubuf)
 371 {
 372         double buf[32];
 373         int ret, i;
 374
 375         flush_vsx_to_thread(target);
 376
 377         for (i = 0; i < 32 ; i++)
 378                 buf[i] = target->thread.fpr[i][TS_VSRLOWOFFSET];
 379         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 380                                   buf, 0, 32 * sizeof(double));
 381
 382         return ret;
 383 }
 384
 385 static int vsr_set(struct task_struct *target, const struct user_regset *regset,
 386                    unsigned int pos, unsigned int count,
 387                    const void *kbuf, const void __user *ubuf)
 388 {
 389         double buf[32];
 390         int ret,i;
 391
 392         flush_vsx_to_thread(target);
 393
 394         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 395                                  buf, 0, 32 * sizeof(double));
 396         for (i = 0; i < 32 ; i++)
 397                 target->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
 398
 399
 400         return ret;
 401 }
 402 #endif /* CONFIG_VSX */
 403
 404 #ifdef CONFIG_SPE
 405
 406 /*
 407  * For get_evrregs/set_evrregs functions 'data' has the following layout:
 408  *
 409  * struct {
 410  *   u32 evr[32];
 411  *   u64 acc;
 412  *   u32 spefscr;
 413  * }
 414  */
 415
 416 static int evr_active(struct task_struct *target,
 417                       const struct user_regset *regset)
 418 {
 419         flush_spe_to_thread(target);
 420         return target->thread.used_spe ? regset->n : 0;
 421 }
 422
 423 static int evr_get(struct task_struct *target, const struct user_regset *regset,
 424                    unsigned int pos, unsigned int count,
 425                    void *kbuf, void __user *ubuf)
 426 {
 427         int ret;
 428
 429         flush_spe_to_thread(target);
 430
 431         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 432                                   &target->thread.evr,
 433                                   0, sizeof(target->thread.evr));
 434
 435         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
 436                      offsetof(struct thread_struct, spefscr));
 437
 438         if (!ret)
 439                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 440                                           &target->thread.acc,
 441                                           sizeof(target->thread.evr), -1);
 442
 443         return ret;
 444 }
 445
 446 static int evr_set(struct task_struct *target, const struct user_regset *regset,
 447                    unsigned int pos, unsigned int count,
 448                    const void *kbuf, const void __user *ubuf)
 449 {
 450         int ret;
 451
 452         flush_spe_to_thread(target);
 453
 454         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 455                                  &target->thread.evr,
 456                                  0, sizeof(target->thread.evr));
 457
 458         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
 459                      offsetof(struct thread_struct, spefscr));
 460
 461         if (!ret)
 462                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 463                                          &target->thread.acc,
 464                                          sizeof(target->thread.evr), -1);
 465
 466         return ret;
 467 }
 468 #endif /* CONFIG_SPE */
 469
 470
 471 /*
 472  * These are our native regset flavors.
 473  */
 474 enum powerpc_regset {
 475         REGSET_GPR,
 476         REGSET_FPR,
 477 #ifdef CONFIG_ALTIVEC
 478         REGSET_VMX,
 479 #endif
 480 #ifdef CONFIG_VSX
 481         REGSET_VSX,
 482 #endif
 483 #ifdef CONFIG_SPE
 484         REGSET_SPE,
 485 #endif
 486 };
 487
 488 static const struct user_regset native_regsets[] = {
 489         [REGSET_GPR] = {
 490                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 491                 .size = sizeof(long), .align = sizeof(long),
 492                 .get = gpr_get, .set = gpr_set
 493         },
 494         [REGSET_FPR] = {
 495                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 496                 .size = sizeof(double), .align = sizeof(double),
 497                 .get = fpr_get, .set = fpr_set
 498         },
 499 #ifdef CONFIG_ALTIVEC
 500         [REGSET_VMX] = {
 501                 .core_note_type = NT_PPC_VMX, .n = 34,
 502                 .size = sizeof(vector128), .align = sizeof(vector128),
 503                 .active = vr_active, .get = vr_get, .set = vr_set
 504         },
 505 #endif
 506 #ifdef CONFIG_VSX
 507         [REGSET_VSX] = {
 508                 .core_note_type = NT_PPC_VSX, .n = 32,
 509                 .size = sizeof(double), .align = sizeof(double),
 510                 .active = vsr_active, .get = vsr_get, .set = vsr_set
 511         },
 512 #endif
 513 #ifdef CONFIG_SPE
 514         [REGSET_SPE] = {
 515                 .n = 35,
 516                 .size = sizeof(u32), .align = sizeof(u32),
 517                 .active = evr_active, .get = evr_get, .set = evr_set
 518         },
 519 #endif
 520 };
 521
 522 static const struct user_regset_view user_ppc_native_view = {
 523         .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
 524         .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
 525 };
 526
 527 #ifdef CONFIG_PPC64
 528 #include <linux/compat.h>
 529
 530 static int gpr32_get(struct task_struct *target,
 531                      const struct user_regset *regset,
 532                      unsigned int pos, unsigned int count,
 533                      void *kbuf, void __user *ubuf)
 534 {
 535         const unsigned long *regs = &target->thread.regs->gpr[0];
 536         compat_ulong_t *k = kbuf;
 537         compat_ulong_t __user *u = ubuf;
 538         compat_ulong_t reg;
 539
 540         if (target->thread.regs == NULL)
 541                 return -EIO;
 542
 543         CHECK_FULL_REGS(target->thread.regs);
 544
 545         pos /= sizeof(reg);
 546         count /= sizeof(reg);
 547
 548         if (kbuf)
 549                 for (; count > 0 && pos < PT_MSR; --count)
 550                         *k++ = regs[pos++];
 551         else
 552                 for (; count > 0 && pos < PT_MSR; --count)
 553                         if (__put_user((compat_ulong_t) regs[pos++], u++))
 554                                 return -EFAULT;
 555
 556         if (count > 0 && pos == PT_MSR) {
 557                 reg = get_user_msr(target);
 558                 if (kbuf)
 559                         *k++ = reg;
 560                 else if (__put_user(reg, u++))
 561                         return -EFAULT;
 562                 ++pos;
 563                 --count;
 564         }
 565
 566         if (kbuf)
 567                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
 568                         *k++ = regs[pos++];
 569         else
 570                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
 571                         if (__put_user((compat_ulong_t) regs[pos++], u++))
 572                                 return -EFAULT;
 573
 574         kbuf = k;
 575         ubuf = u;
 576         pos *= sizeof(reg);
 577         count *= sizeof(reg);
 578         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 579                                         PT_REGS_COUNT * sizeof(reg), -1);
 580 }
 581
 582 static int gpr32_set(struct task_struct *target,
 583                      const struct user_regset *regset,
 584                      unsigned int pos, unsigned int count,
 585                      const void *kbuf, const void __user *ubuf)
 586 {
 587         unsigned long *regs = &target->thread.regs->gpr[0];
 588         const compat_ulong_t *k = kbuf;
 589         const compat_ulong_t __user *u = ubuf;
 590         compat_ulong_t reg;
 591
 592         if (target->thread.regs == NULL)
 593                 return -EIO;
 594
 595         CHECK_FULL_REGS(target->thread.regs);
 596
 597         pos /= sizeof(reg);
 598         count /= sizeof(reg);
 599
 600         if (kbuf)
 601                 for (; count > 0 && pos < PT_MSR; --count)
 602                         regs[pos++] = *k++;
 603         else
 604                 for (; count > 0 && pos < PT_MSR; --count) {
 605                         if (__get_user(reg, u++))
 606                                 return -EFAULT;
 607                         regs[pos++] = reg;
 608                 }
 609
 610
 611         if (count > 0 && pos == PT_MSR) {
 612                 if (kbuf)
 613                         reg = *k++;
 614                 else if (__get_user(reg, u++))
 615                         return -EFAULT;
 616                 set_user_msr(target, reg);
 617                 ++pos;
 618                 --count;
 619         }
 620
 621         if (kbuf) {
 622                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
 623                         regs[pos++] = *k++;
 624                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
 625                         ++k;
 626         } else {
 627                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
 628                         if (__get_user(reg, u++))
 629                                 return -EFAULT;
 630                         regs[pos++] = reg;
 631                 }
 632                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
 633                         if (__get_user(reg, u++))
 634                                 return -EFAULT;
 635         }
 636
 637         if (count > 0 && pos == PT_TRAP) {
 638                 if (kbuf)
 639                         reg = *k++;
 640                 else if (__get_user(reg, u++))
 641                         return -EFAULT;
 642                 set_user_trap(target, reg);
 643                 ++pos;
 644                 --count;
 645         }
 646
 647         kbuf = k;
 648         ubuf = u;
 649         pos *= sizeof(reg);
 650         count *= sizeof(reg);
 651         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 652                                          (PT_TRAP + 1) * sizeof(reg), -1);
 653 }
 654
 655 /*
 656  * These are the regset flavors matching the CONFIG_PPC32 native set.
 657  */
 658 static const struct user_regset compat_regsets[] = {
 659         [REGSET_GPR] = {
 660                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 661                 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
 662                 .get = gpr32_get, .set = gpr32_set
 663         },
 664         [REGSET_FPR] = {
 665                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 666                 .size = sizeof(double), .align = sizeof(double),
 667                 .get = fpr_get, .set = fpr_set
 668         },
 669 #ifdef CONFIG_ALTIVEC
 670         [REGSET_VMX] = {
 671                 .core_note_type = NT_PPC_VMX, .n = 34,
 672                 .size = sizeof(vector128), .align = sizeof(vector128),
 673                 .active = vr_active, .get = vr_get, .set = vr_set
 674         },
 675 #endif
 676 #ifdef CONFIG_SPE
 677         [REGSET_SPE] = {
 678                 .core_note_type = NT_PPC_SPE, .n = 35,
 679                 .size = sizeof(u32), .align = sizeof(u32),
 680                 .active = evr_active, .get = evr_get, .set = evr_set
 681         },
 682 #endif
 683 };
 684
 685 static const struct user_regset_view user_ppc_compat_view = {
 686         .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
 687         .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
 688 };
 689 #endif  /* CONFIG_PPC64 */
 690
 691 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 692 {
 693 #ifdef CONFIG_PPC64
 694         if (test_tsk_thread_flag(task, TIF_32BIT))
 695                 return &user_ppc_compat_view;
 696 #endif
 697         return &user_ppc_native_view;
 698 }
 699
 700
 701 void user_enable_single_step(struct task_struct *task)
 702 {
 703         struct pt_regs *regs = task->thread.regs;
 704
 705         if (regs != NULL) {
 706 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 707                 task->thread.dbcr0 &= ~DBCR0_BT;
 708                 task->thread.dbcr0 |= DBCR0_IDM | DBCR0_IC;
 709                 regs->msr |= MSR_DE;
 710 #else
 711                 regs->msr &= ~MSR_BE;
 712                 regs->msr |= MSR_SE;
 713 #endif
 714         }
 715         set_tsk_thread_flag(task, TIF_SINGLESTEP);
 716 }
 717
 718 void user_enable_block_step(struct task_struct *task)
 719 {
 720         struct pt_regs *regs = task->thread.regs;
 721
 722         if (regs != NULL) {
 723 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 724                 task->thread.dbcr0 &= ~DBCR0_IC;
 725                 task->thread.dbcr0 = DBCR0_IDM | DBCR0_BT;
 726                 regs->msr |= MSR_DE;
 727 #else
 728                 regs->msr &= ~MSR_SE;
 729                 regs->msr |= MSR_BE;
 730 #endif
 731         }
 732         set_tsk_thread_flag(task, TIF_SINGLESTEP);
 733 }
 734
 735 void user_disable_single_step(struct task_struct *task)
 736 {
 737         struct pt_regs *regs = task->thread.regs;
 738
 739         if (regs != NULL) {
 740 #if defined(CONFIG_BOOKE)
 741                 /* If DAC don't clear DBCRO_IDM or MSR_DE */
 742                 if (task->thread.dabr)
 743                         task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_BT);
 744                 else {
 745                         task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_BT | DBCR0_IDM);
 746                         regs->msr &= ~MSR_DE;
 747                 }
 748 #elif defined(CONFIG_40x)
 749                 task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_BT | DBCR0_IDM);
 750                 regs->msr &= ~MSR_DE;
 751 #else
 752                 regs->msr &= ~(MSR_SE | MSR_BE);
 753 #endif
 754         }
 755         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
 756 }
 757
 758 int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
 759                                unsigned long data)
 760 {
 761         /* For ppc64 we support one DABR and no IABR's at the moment (ppc64).
 762          *  For embedded processors we support one DAC and no IAC's at the
 763          *  moment.
 764          */
 765         if (addr > 0)
 766                 return -EINVAL;
 767
 768         /* The bottom 3 bits in dabr are flags */
 769         if ((data & ~0x7UL) >= TASK_SIZE)
 770                 return -EIO;
 771
 772 #ifndef CONFIG_BOOKE
 773
 774         /* For processors using DABR (i.e. 970), the bottom 3 bits are flags.
 775          *  It was assumed, on previous implementations, that 3 bits were
 776          *  passed together with the data address, fitting the design of the
 777          *  DABR register, as follows:
 778          *
 779          *  bit 0: Read flag
 780          *  bit 1: Write flag
 781          *  bit 2: Breakpoint translation
 782          *
 783          *  Thus, we use them here as so.
 784          */
 785
 786         /* Ensure breakpoint translation bit is set */
 787         if (data && !(data & DABR_TRANSLATION))
 788                 return -EIO;
 789
 790         /* Move contents to the DABR register */
 791         task->thread.dabr = data;
 792
 793 #endif
 794 #if defined(CONFIG_BOOKE)
 795
 796         /* As described above, it was assumed 3 bits were passed with the data
 797          *  address, but we will assume only the mode bits will be passed
 798          *  as to not cause alignment restrictions for DAC-based processors.
 799          */
 800
 801         /* DAC's hold the whole address without any mode flags */
 802         task->thread.dabr = data & ~0x3UL;
 803
 804         if (task->thread.dabr == 0) {
 805                 task->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W | DBCR0_IDM);
 806                 task->thread.regs->msr &= ~MSR_DE;
 807                 return 0;
 808         }
 809
 810         /* Read or Write bits must be set */
 811
 812         if (!(data & 0x3UL))
 813                 return -EINVAL;
 814
 815         /* Set the Internal Debugging flag (IDM bit 1) for the DBCR0
 816            register */
 817         task->thread.dbcr0 = DBCR0_IDM;
 818
 819         /* Check for write and read flags and set DBCR0
 820            accordingly */
 821         if (data & 0x1UL)
 822                 task->thread.dbcr0 |= DBSR_DAC1R;
 823         if (data & 0x2UL)
 824                 task->thread.dbcr0 |= DBSR_DAC1W;
 825
 826         task->thread.regs->msr |= MSR_DE;
 827 #endif
 828         return 0;
 829 }
 830
 831 /*
 832  * Called by kernel/ptrace.c when detaching..
 833  *
 834  * Make sure single step bits etc are not set.
 835  */
 836 void ptrace_disable(struct task_struct *child)
 837 {
 838         /* make sure the single step bit is not set. */
 839         user_disable_single_step(child);
 840 }
 841
 842 /*
 843  * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
 844  * we mark them as obsolete now, they will be removed in a future version
 845  */
 846 static long arch_ptrace_old(struct task_struct *child, long request, long addr,
 847                             long data)
 848 {
 849         switch (request) {
 850         case PPC_PTRACE_GETREGS:        /* Get GPRs 0 - 31. */
 851                 return copy_regset_to_user(child, &user_ppc_native_view,
 852                                            REGSET_GPR, 0, 32 * sizeof(long),
 853                                            (void __user *) data);
 854
 855         case PPC_PTRACE_SETREGS:        /* Set GPRs 0 - 31. */
 856                 return copy_regset_from_user(child, &user_ppc_native_view,
 857                                              REGSET_GPR, 0, 32 * sizeof(long),
 858                                              (const void __user *) data);
 859
 860         case PPC_PTRACE_GETFPREGS:      /* Get FPRs 0 - 31. */
 861                 return copy_regset_to_user(child, &user_ppc_native_view,
 862                                            REGSET_FPR, 0, 32 * sizeof(double),
 863                                            (void __user *) data);
 864
 865         case PPC_PTRACE_SETFPREGS:      /* Set FPRs 0 - 31. */
 866                 return copy_regset_from_user(child, &user_ppc_native_view,
 867                                              REGSET_FPR, 0, 32 * sizeof(double),
 868                                              (const void __user *) data);
 869         }
 870
 871         return -EPERM;
 872 }
 873
 874 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 875 {
 876         int ret = -EPERM;
 877
 878         switch (request) {
 879         /* read the word at location addr in the USER area. */
 880         case PTRACE_PEEKUSR: {
 881                 unsigned long index, tmp;
 882
 883                 ret = -EIO;
 884                 /* convert to index and check */
 885 #ifdef CONFIG_PPC32
 886                 index = (unsigned long) addr >> 2;
 887                 if ((addr & 3) || (index > PT_FPSCR)
 888                     || (child->thread.regs == NULL))
 889 #else
 890                 index = (unsigned long) addr >> 3;
 891                 if ((addr & 7) || (index > PT_FPSCR))
 892 #endif
 893                         break;
 894
 895                 CHECK_FULL_REGS(child->thread.regs);
 896                 if (index < PT_FPR0) {
 897                         tmp = ptrace_get_reg(child, (int) index);
 898                 } else {
 899                         flush_fp_to_thread(child);
 900                         tmp = ((unsigned long *)child->thread.fpr)
 901                                 [TS_FPRWIDTH * (index - PT_FPR0)];
 902                 }
 903                 ret = put_user(tmp,(unsigned long __user *) data);
 904                 break;
 905         }
 906
 907         /* write the word at location addr in the USER area */
 908         case PTRACE_POKEUSR: {
 909                 unsigned long index;
 910
 911                 ret = -EIO;
 912                 /* convert to index and check */
 913 #ifdef CONFIG_PPC32
 914                 index = (unsigned long) addr >> 2;
 915                 if ((addr & 3) || (index > PT_FPSCR)
 916                     || (child->thread.regs == NULL))
 917 #else
 918                 index = (unsigned long) addr >> 3;
 919                 if ((addr & 7) || (index > PT_FPSCR))
 920 #endif
 921                         break;
 922
 923                 CHECK_FULL_REGS(child->thread.regs);
 924                 if (index < PT_FPR0) {
 925                         ret = ptrace_put_reg(child, index, data);
 926                 } else {
 927                         flush_fp_to_thread(child);
 928                         ((unsigned long *)child->thread.fpr)
 929                                 [TS_FPRWIDTH * (index - PT_FPR0)] = data;
 930                         ret = 0;
 931                 }
 932                 break;
 933         }
 934
 935         case PTRACE_GET_DEBUGREG: {
 936                 ret = -EINVAL;
 937                 /* We only support one DABR and no IABRS at the moment */
 938                 if (addr > 0)
 939                         break;
 940                 ret = put_user(child->thread.dabr,
 941                                (unsigned long __user *)data);
 942                 break;
 943         }
 944
 945         case PTRACE_SET_DEBUGREG:
 946                 ret = ptrace_set_debugreg(child, addr, data);
 947                 break;
 948
 949 #ifdef CONFIG_PPC64
 950         case PTRACE_GETREGS64:
 951 #endif
 952         case PTRACE_GETREGS:    /* Get all pt_regs from the child. */
 953                 return copy_regset_to_user(child, &user_ppc_native_view,
 954                                            REGSET_GPR,
 955                                            0, sizeof(struct pt_regs),
 956                                            (void __user *) data);
 957
 958 #ifdef CONFIG_PPC64
 959         case PTRACE_SETREGS64:
 960 #endif
 961         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
 962                 return copy_regset_from_user(child, &user_ppc_native_view,
 963                                              REGSET_GPR,
 964                                              0, sizeof(struct pt_regs),
 965                                              (const void __user *) data);
 966
 967         case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
 968                 return copy_regset_to_user(child, &user_ppc_native_view,
 969                                            REGSET_FPR,
 970                                            0, sizeof(elf_fpregset_t),
 971                                            (void __user *) data);
 972
 973         case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
 974                 return copy_regset_from_user(child, &user_ppc_native_view,
 975                                              REGSET_FPR,
 976                                              0, sizeof(elf_fpregset_t),
 977                                              (const void __user *) data);
 978
 979 #ifdef CONFIG_ALTIVEC
 980         case PTRACE_GETVRREGS:
 981                 return copy_regset_to_user(child, &user_ppc_native_view,
 982                                            REGSET_VMX,
 983                                            0, (33 * sizeof(vector128) +
 984                                                sizeof(u32)),
 985                                            (void __user *) data);
 986
 987         case PTRACE_SETVRREGS:
 988                 return copy_regset_from_user(child, &user_ppc_native_view,
 989                                              REGSET_VMX,
 990                                              0, (33 * sizeof(vector128) +
 991                                                  sizeof(u32)),
 992                                              (const void __user *) data);
 993 #endif
 994 #ifdef CONFIG_VSX
 995         case PTRACE_GETVSRREGS:
 996                 return copy_regset_to_user(child, &user_ppc_native_view,
 997                                            REGSET_VSX,
 998                                            0, 32 * sizeof(double),
 999                                            (void __user *) data);
1000
1001         case PTRACE_SETVSRREGS:
1002                 return copy_regset_from_user(child, &user_ppc_native_view,
1003                                              REGSET_VSX,
1004                                              0, 32 * sizeof(double),
1005                                              (const void __user *) data);
1006 #endif
1007 #ifdef CONFIG_SPE
1008         case PTRACE_GETEVRREGS:
1009                 /* Get the child spe register state. */
1010                 return copy_regset_to_user(child, &user_ppc_native_view,
1011                                            REGSET_SPE, 0, 35 * sizeof(u32),
1012                                            (void __user *) data);
1013
1014         case PTRACE_SETEVRREGS:
1015                 /* Set the child spe register state. */
1016                 return copy_regset_from_user(child, &user_ppc_native_view,
1017                                              REGSET_SPE, 0, 35 * sizeof(u32),
1018                                              (const void __user *) data);
1019 #endif
1020
1021         /* Old reverse args ptrace callss */
1022         case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
1023         case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
1024         case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
1025         case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
1026                 ret = arch_ptrace_old(child, request, addr, data);
1027                 break;
1028
1029         default:
1030                 ret = ptrace_request(child, request, addr, data);
1031                 break;
1032         }
1033         return ret;
1034 }
1035
1036 /*
1037  * We must return the syscall number to actually look up in the table.
1038  * This can be -1L to skip running any syscall at all.
1039  */
1040 long do_syscall_trace_enter(struct pt_regs *regs)
1041 {
1042         long ret = 0;
1043
1044         secure_computing(regs->gpr[0]);
1045
1046         if (test_thread_flag(TIF_SYSCALL_TRACE) &&
1047             tracehook_report_syscall_entry(regs))
1048                 /*
1049                  * Tracing decided this syscall should not happen.
1050                  * We'll return a bogus call number to get an ENOSYS
1051                  * error, but leave the original number in regs->gpr[0].
1052                  */
1053                 ret = -1L;
1054
1055         if (unlikely(current->audit_context)) {
1056 #ifdef CONFIG_PPC64
1057                 if (!test_thread_flag(TIF_32BIT))
1058                         audit_syscall_entry(AUDIT_ARCH_PPC64,
1059                                             regs->gpr[0],
1060                                             regs->gpr[3], regs->gpr[4],
1061                                             regs->gpr[5], regs->gpr[6]);
1062                 else
1063 #endif
1064                         audit_syscall_entry(AUDIT_ARCH_PPC,
1065                                             regs->gpr[0],
1066                                             regs->gpr[3] & 0xffffffff,
1067                                             regs->gpr[4] & 0xffffffff,
1068                                             regs->gpr[5] & 0xffffffff,
1069                                             regs->gpr[6] & 0xffffffff);
1070         }
1071
1072         return ret ?: regs->gpr[0];
1073 }
1074
1075 void do_syscall_trace_leave(struct pt_regs *regs)
1076 {
1077         int step;
1078
1079         if (unlikely(current->audit_context))
1080                 audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
1081                                    regs->result);
1082
1083         step = test_thread_flag(TIF_SINGLESTEP);
1084         if (step || test_thread_flag(TIF_SYSCALL_TRACE))
1085                 tracehook_report_syscall_exit(regs, step);
1086 }