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_IDM | DBCR0_IC;
 708                 regs->msr |= MSR_DE;
 709 #else
 710                 regs->msr |= MSR_SE;
 711 #endif
 712         }
 713         set_tsk_thread_flag(task, TIF_SINGLESTEP);
 714 }
 715
 716 void user_disable_single_step(struct task_struct *task)
 717 {
 718         struct pt_regs *regs = task->thread.regs;
 719
 720
 721 #if defined(CONFIG_BOOKE)
 722         /* If DAC then do not single step, skip */
 723         if (task->thread.dabr)
 724                 return;
 725 #endif
 726
 727         if (regs != NULL) {
 728 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 729                 task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_IDM);
 730                 regs->msr &= ~MSR_DE;
 731 #else
 732                 regs->msr &= ~MSR_SE;
 733 #endif
 734         }
 735         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
 736 }
 737
 738 int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
 739                                unsigned long data)
 740 {
 741         /* For ppc64 we support one DABR and no IABR's at the moment (ppc64).
 742          *  For embedded processors we support one DAC and no IAC's at the
 743          *  moment.
 744          */
 745         if (addr > 0)
 746                 return -EINVAL;
 747
 748         /* The bottom 3 bits in dabr are flags */
 749         if ((data & ~0x7UL) >= TASK_SIZE)
 750                 return -EIO;
 751
 752 #ifndef CONFIG_BOOKE
 753
 754         /* For processors using DABR (i.e. 970), the bottom 3 bits are flags.
 755          *  It was assumed, on previous implementations, that 3 bits were
 756          *  passed together with the data address, fitting the design of the
 757          *  DABR register, as follows:
 758          *
 759          *  bit 0: Read flag
 760          *  bit 1: Write flag
 761          *  bit 2: Breakpoint translation
 762          *
 763          *  Thus, we use them here as so.
 764          */
 765
 766         /* Ensure breakpoint translation bit is set */
 767         if (data && !(data & DABR_TRANSLATION))
 768                 return -EIO;
 769
 770         /* Move contents to the DABR register */
 771         task->thread.dabr = data;
 772
 773 #endif
 774 #if defined(CONFIG_BOOKE)
 775
 776         /* As described above, it was assumed 3 bits were passed with the data
 777          *  address, but we will assume only the mode bits will be passed
 778          *  as to not cause alignment restrictions for DAC-based processors.
 779          */
 780
 781         /* DAC's hold the whole address without any mode flags */
 782         task->thread.dabr = data & ~0x3UL;
 783
 784         if (task->thread.dabr == 0) {
 785                 task->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W | DBCR0_IDM);
 786                 task->thread.regs->msr &= ~MSR_DE;
 787                 return 0;
 788         }
 789
 790         /* Read or Write bits must be set */
 791
 792         if (!(data & 0x3UL))
 793                 return -EINVAL;
 794
 795         /* Set the Internal Debugging flag (IDM bit 1) for the DBCR0
 796            register */
 797         task->thread.dbcr0 = DBCR0_IDM;
 798
 799         /* Check for write and read flags and set DBCR0
 800            accordingly */
 801         if (data & 0x1UL)
 802                 task->thread.dbcr0 |= DBSR_DAC1R;
 803         if (data & 0x2UL)
 804                 task->thread.dbcr0 |= DBSR_DAC1W;
 805
 806         task->thread.regs->msr |= MSR_DE;
 807 #endif
 808         return 0;
 809 }
 810
 811 /*
 812  * Called by kernel/ptrace.c when detaching..
 813  *
 814  * Make sure single step bits etc are not set.
 815  */
 816 void ptrace_disable(struct task_struct *child)
 817 {
 818         /* make sure the single step bit is not set. */
 819         user_disable_single_step(child);
 820 }
 821
 822 /*
 823  * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
 824  * we mark them as obsolete now, they will be removed in a future version
 825  */
 826 static long arch_ptrace_old(struct task_struct *child, long request, long addr,
 827                             long data)
 828 {
 829         switch (request) {
 830         case PPC_PTRACE_GETREGS:        /* Get GPRs 0 - 31. */
 831                 return copy_regset_to_user(child, &user_ppc_native_view,
 832                                            REGSET_GPR, 0, 32 * sizeof(long),
 833                                            (void __user *) data);
 834
 835         case PPC_PTRACE_SETREGS:        /* Set GPRs 0 - 31. */
 836                 return copy_regset_from_user(child, &user_ppc_native_view,
 837                                              REGSET_GPR, 0, 32 * sizeof(long),
 838                                              (const void __user *) data);
 839
 840         case PPC_PTRACE_GETFPREGS:      /* Get FPRs 0 - 31. */
 841                 return copy_regset_to_user(child, &user_ppc_native_view,
 842                                            REGSET_FPR, 0, 32 * sizeof(double),
 843                                            (void __user *) data);
 844
 845         case PPC_PTRACE_SETFPREGS:      /* Set FPRs 0 - 31. */
 846                 return copy_regset_from_user(child, &user_ppc_native_view,
 847                                              REGSET_FPR, 0, 32 * sizeof(double),
 848                                              (const void __user *) data);
 849         }
 850
 851         return -EPERM;
 852 }
 853
 854 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 855 {
 856         int ret = -EPERM;
 857
 858         switch (request) {
 859         /* read the word at location addr in the USER area. */
 860         case PTRACE_PEEKUSR: {
 861                 unsigned long index, tmp;
 862
 863                 ret = -EIO;
 864                 /* convert to index and check */
 865 #ifdef CONFIG_PPC32
 866                 index = (unsigned long) addr >> 2;
 867                 if ((addr & 3) || (index > PT_FPSCR)
 868                     || (child->thread.regs == NULL))
 869 #else
 870                 index = (unsigned long) addr >> 3;
 871                 if ((addr & 7) || (index > PT_FPSCR))
 872 #endif
 873                         break;
 874
 875                 CHECK_FULL_REGS(child->thread.regs);
 876                 if (index < PT_FPR0) {
 877                         tmp = ptrace_get_reg(child, (int) index);
 878                 } else {
 879                         flush_fp_to_thread(child);
 880                         tmp = ((unsigned long *)child->thread.fpr)
 881                                 [TS_FPRWIDTH * (index - PT_FPR0)];
 882                 }
 883                 ret = put_user(tmp,(unsigned long __user *) data);
 884                 break;
 885         }
 886
 887         /* write the word at location addr in the USER area */
 888         case PTRACE_POKEUSR: {
 889                 unsigned long index;
 890
 891                 ret = -EIO;
 892                 /* convert to index and check */
 893 #ifdef CONFIG_PPC32
 894                 index = (unsigned long) addr >> 2;
 895                 if ((addr & 3) || (index > PT_FPSCR)
 896                     || (child->thread.regs == NULL))
 897 #else
 898                 index = (unsigned long) addr >> 3;
 899                 if ((addr & 7) || (index > PT_FPSCR))
 900 #endif
 901                         break;
 902
 903                 CHECK_FULL_REGS(child->thread.regs);
 904                 if (index < PT_FPR0) {
 905                         ret = ptrace_put_reg(child, index, data);
 906                 } else {
 907                         flush_fp_to_thread(child);
 908                         ((unsigned long *)child->thread.fpr)
 909                                 [TS_FPRWIDTH * (index - PT_FPR0)] = data;
 910                         ret = 0;
 911                 }
 912                 break;
 913         }
 914
 915         case PTRACE_GET_DEBUGREG: {
 916                 ret = -EINVAL;
 917                 /* We only support one DABR and no IABRS at the moment */
 918                 if (addr > 0)
 919                         break;
 920                 ret = put_user(child->thread.dabr,
 921                                (unsigned long __user *)data);
 922                 break;
 923         }
 924
 925         case PTRACE_SET_DEBUGREG:
 926                 ret = ptrace_set_debugreg(child, addr, data);
 927                 break;
 928
 929 #ifdef CONFIG_PPC64
 930         case PTRACE_GETREGS64:
 931 #endif
 932         case PTRACE_GETREGS:    /* Get all pt_regs from the child. */
 933                 return copy_regset_to_user(child, &user_ppc_native_view,
 934                                            REGSET_GPR,
 935                                            0, sizeof(struct pt_regs),
 936                                            (void __user *) data);
 937
 938 #ifdef CONFIG_PPC64
 939         case PTRACE_SETREGS64:
 940 #endif
 941         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
 942                 return copy_regset_from_user(child, &user_ppc_native_view,
 943                                              REGSET_GPR,
 944                                              0, sizeof(struct pt_regs),
 945                                              (const void __user *) data);
 946
 947         case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
 948                 return copy_regset_to_user(child, &user_ppc_native_view,
 949                                            REGSET_FPR,
 950                                            0, sizeof(elf_fpregset_t),
 951                                            (void __user *) data);
 952
 953         case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
 954                 return copy_regset_from_user(child, &user_ppc_native_view,
 955                                              REGSET_FPR,
 956                                              0, sizeof(elf_fpregset_t),
 957                                              (const void __user *) data);
 958
 959 #ifdef CONFIG_ALTIVEC
 960         case PTRACE_GETVRREGS:
 961                 return copy_regset_to_user(child, &user_ppc_native_view,
 962                                            REGSET_VMX,
 963                                            0, (33 * sizeof(vector128) +
 964                                                sizeof(u32)),
 965                                            (void __user *) data);
 966
 967         case PTRACE_SETVRREGS:
 968                 return copy_regset_from_user(child, &user_ppc_native_view,
 969                                              REGSET_VMX,
 970                                              0, (33 * sizeof(vector128) +
 971                                                  sizeof(u32)),
 972                                              (const void __user *) data);
 973 #endif
 974 #ifdef CONFIG_VSX
 975         case PTRACE_GETVSRREGS:
 976                 return copy_regset_to_user(child, &user_ppc_native_view,
 977                                            REGSET_VSX,
 978                                            0, 32 * sizeof(double),
 979                                            (void __user *) data);
 980
 981         case PTRACE_SETVSRREGS:
 982                 return copy_regset_from_user(child, &user_ppc_native_view,
 983                                              REGSET_VSX,
 984                                              0, 32 * sizeof(double),
 985                                              (const void __user *) data);
 986 #endif
 987 #ifdef CONFIG_SPE
 988         case PTRACE_GETEVRREGS:
 989                 /* Get the child spe register state. */
 990                 return copy_regset_to_user(child, &user_ppc_native_view,
 991                                            REGSET_SPE, 0, 35 * sizeof(u32),
 992                                            (void __user *) data);
 993
 994         case PTRACE_SETEVRREGS:
 995                 /* Set the child spe register state. */
 996                 return copy_regset_from_user(child, &user_ppc_native_view,
 997                                              REGSET_SPE, 0, 35 * sizeof(u32),
 998                                              (const void __user *) data);
 999 #endif
1000
1001         /* Old reverse args ptrace callss */
1002         case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
1003         case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
1004         case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
1005         case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
1006                 ret = arch_ptrace_old(child, request, addr, data);
1007                 break;
1008
1009         default:
1010                 ret = ptrace_request(child, request, addr, data);
1011                 break;
1012         }
1013         return ret;
1014 }
1015
1016 /*
1017  * We must return the syscall number to actually look up in the table.
1018  * This can be -1L to skip running any syscall at all.
1019  */
1020 long do_syscall_trace_enter(struct pt_regs *regs)
1021 {
1022         long ret = 0;
1023
1024         secure_computing(regs->gpr[0]);
1025
1026         if (test_thread_flag(TIF_SYSCALL_TRACE) &&
1027             tracehook_report_syscall_entry(regs))
1028                 /*
1029                  * Tracing decided this syscall should not happen.
1030                  * We'll return a bogus call number to get an ENOSYS
1031                  * error, but leave the original number in regs->gpr[0].
1032                  */
1033                 ret = -1L;
1034
1035         if (unlikely(current->audit_context)) {
1036 #ifdef CONFIG_PPC64
1037                 if (!test_thread_flag(TIF_32BIT))
1038                         audit_syscall_entry(AUDIT_ARCH_PPC64,
1039                                             regs->gpr[0],
1040                                             regs->gpr[3], regs->gpr[4],
1041                                             regs->gpr[5], regs->gpr[6]);
1042                 else
1043 #endif
1044                         audit_syscall_entry(AUDIT_ARCH_PPC,
1045                                             regs->gpr[0],
1046                                             regs->gpr[3] & 0xffffffff,
1047                                             regs->gpr[4] & 0xffffffff,
1048                                             regs->gpr[5] & 0xffffffff,
1049                                             regs->gpr[6] & 0xffffffff);
1050         }
1051
1052         return ret ?: regs->gpr[0];
1053 }
1054
1055 void do_syscall_trace_leave(struct pt_regs *regs)
1056 {
1057         int step;
1058
1059         if (unlikely(current->audit_context))
1060                 audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
1061                                    regs->result);
1062
1063         step = test_thread_flag(TIF_SINGLESTEP);
1064         if (step || test_thread_flag(TIF_SYSCALL_TRACE))
1065                 tracehook_report_syscall_exit(regs, step);
1066 }