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         double buf[32];
 372         int ret, i;
 373
 374         flush_vsx_to_thread(target);
 375
 376         for (i = 0; i < 32 ; i++)
 377                 buf[i] = current->thread.fpr[i][TS_VSRLOWOFFSET];
 378         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 379                                   buf, 0, 32 * sizeof(double));
 380
 381         return ret;
 382 }
 383
 384 static int vsr_set(struct task_struct *target, const struct user_regset *regset,
 385                    unsigned int pos, unsigned int count,
 386                    const void *kbuf, const void __user *ubuf)
 387 {
 388         double buf[32];
 389         int ret,i;
 390
 391         flush_vsx_to_thread(target);
 392
 393         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 394                                  buf, 0, 32 * sizeof(double));
 395         for (i = 0; i < 32 ; i++)
 396                 current->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
 397
 398
 399         return ret;
 400 }
 401 #endif /* CONFIG_VSX */
 402
 403 #ifdef CONFIG_SPE
 404
 405 /*
 406  * For get_evrregs/set_evrregs functions 'data' has the following layout:
 407  *
 408  * struct {
 409  *   u32 evr[32];
 410  *   u64 acc;
 411  *   u32 spefscr;
 412  * }
 413  */
 414
 415 static int evr_active(struct task_struct *target,
 416                       const struct user_regset *regset)
 417 {
 418         flush_spe_to_thread(target);
 419         return target->thread.used_spe ? regset->n : 0;
 420 }
 421
 422 static int evr_get(struct task_struct *target, const struct user_regset *regset,
 423                    unsigned int pos, unsigned int count,
 424                    void *kbuf, void __user *ubuf)
 425 {
 426         int ret;
 427
 428         flush_spe_to_thread(target);
 429
 430         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 431                                   &target->thread.evr,
 432                                   0, sizeof(target->thread.evr));
 433
 434         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
 435                      offsetof(struct thread_struct, spefscr));
 436
 437         if (!ret)
 438                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 439                                           &target->thread.acc,
 440                                           sizeof(target->thread.evr), -1);
 441
 442         return ret;
 443 }
 444
 445 static int evr_set(struct task_struct *target, const struct user_regset *regset,
 446                    unsigned int pos, unsigned int count,
 447                    const void *kbuf, const void __user *ubuf)
 448 {
 449         int ret;
 450
 451         flush_spe_to_thread(target);
 452
 453         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 454                                  &target->thread.evr,
 455                                  0, sizeof(target->thread.evr));
 456
 457         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
 458                      offsetof(struct thread_struct, spefscr));
 459
 460         if (!ret)
 461                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 462                                          &target->thread.acc,
 463                                          sizeof(target->thread.evr), -1);
 464
 465         return ret;
 466 }
 467 #endif /* CONFIG_SPE */
 468
 469
 470 /*
 471  * These are our native regset flavors.
 472  */
 473 enum powerpc_regset {
 474         REGSET_GPR,
 475         REGSET_FPR,
 476 #ifdef CONFIG_ALTIVEC
 477         REGSET_VMX,
 478 #endif
 479 #ifdef CONFIG_VSX
 480         REGSET_VSX,
 481 #endif
 482 #ifdef CONFIG_SPE
 483         REGSET_SPE,
 484 #endif
 485 };
 486
 487 static const struct user_regset native_regsets[] = {
 488         [REGSET_GPR] = {
 489                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 490                 .size = sizeof(long), .align = sizeof(long),
 491                 .get = gpr_get, .set = gpr_set
 492         },
 493         [REGSET_FPR] = {
 494                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 495                 .size = sizeof(double), .align = sizeof(double),
 496                 .get = fpr_get, .set = fpr_set
 497         },
 498 #ifdef CONFIG_ALTIVEC
 499         [REGSET_VMX] = {
 500                 .core_note_type = NT_PPC_VMX, .n = 34,
 501                 .size = sizeof(vector128), .align = sizeof(vector128),
 502                 .active = vr_active, .get = vr_get, .set = vr_set
 503         },
 504 #endif
 505 #ifdef CONFIG_VSX
 506         [REGSET_VSX] = {
 507                 .core_note_type = NT_PPC_VSX, .n = 32,
 508                 .size = sizeof(double), .align = sizeof(double),
 509                 .active = vsr_active, .get = vsr_get, .set = vsr_set
 510         },
 511 #endif
 512 #ifdef CONFIG_SPE
 513         [REGSET_SPE] = {
 514                 .n = 35,
 515                 .size = sizeof(u32), .align = sizeof(u32),
 516                 .active = evr_active, .get = evr_get, .set = evr_set
 517         },
 518 #endif
 519 };
 520
 521 static const struct user_regset_view user_ppc_native_view = {
 522         .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
 523         .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
 524 };
 525
 526 #ifdef CONFIG_PPC64
 527 #include <linux/compat.h>
 528
 529 static int gpr32_get(struct task_struct *target,
 530                      const struct user_regset *regset,
 531                      unsigned int pos, unsigned int count,
 532                      void *kbuf, void __user *ubuf)
 533 {
 534         const unsigned long *regs = &target->thread.regs->gpr[0];
 535         compat_ulong_t *k = kbuf;
 536         compat_ulong_t __user *u = ubuf;
 537         compat_ulong_t reg;
 538
 539         if (target->thread.regs == NULL)
 540                 return -EIO;
 541
 542         CHECK_FULL_REGS(target->thread.regs);
 543
 544         pos /= sizeof(reg);
 545         count /= sizeof(reg);
 546
 547         if (kbuf)
 548                 for (; count > 0 && pos < PT_MSR; --count)
 549                         *k++ = regs[pos++];
 550         else
 551                 for (; count > 0 && pos < PT_MSR; --count)
 552                         if (__put_user((compat_ulong_t) regs[pos++], u++))
 553                                 return -EFAULT;
 554
 555         if (count > 0 && pos == PT_MSR) {
 556                 reg = get_user_msr(target);
 557                 if (kbuf)
 558                         *k++ = reg;
 559                 else if (__put_user(reg, u++))
 560                         return -EFAULT;
 561                 ++pos;
 562                 --count;
 563         }
 564
 565         if (kbuf)
 566                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
 567                         *k++ = regs[pos++];
 568         else
 569                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
 570                         if (__put_user((compat_ulong_t) regs[pos++], u++))
 571                                 return -EFAULT;
 572
 573         kbuf = k;
 574         ubuf = u;
 575         pos *= sizeof(reg);
 576         count *= sizeof(reg);
 577         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 578                                         PT_REGS_COUNT * sizeof(reg), -1);
 579 }
 580
 581 static int gpr32_set(struct task_struct *target,
 582                      const struct user_regset *regset,
 583                      unsigned int pos, unsigned int count,
 584                      const void *kbuf, const void __user *ubuf)
 585 {
 586         unsigned long *regs = &target->thread.regs->gpr[0];
 587         const compat_ulong_t *k = kbuf;
 588         const compat_ulong_t __user *u = ubuf;
 589         compat_ulong_t reg;
 590
 591         if (target->thread.regs == NULL)
 592                 return -EIO;
 593
 594         CHECK_FULL_REGS(target->thread.regs);
 595
 596         pos /= sizeof(reg);
 597         count /= sizeof(reg);
 598
 599         if (kbuf)
 600                 for (; count > 0 && pos < PT_MSR; --count)
 601                         regs[pos++] = *k++;
 602         else
 603                 for (; count > 0 && pos < PT_MSR; --count) {
 604                         if (__get_user(reg, u++))
 605                                 return -EFAULT;
 606                         regs[pos++] = reg;
 607                 }
 608
 609
 610         if (count > 0 && pos == PT_MSR) {
 611                 if (kbuf)
 612                         reg = *k++;
 613                 else if (__get_user(reg, u++))
 614                         return -EFAULT;
 615                 set_user_msr(target, reg);
 616                 ++pos;
 617                 --count;
 618         }
 619
 620         if (kbuf) {
 621                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
 622                         regs[pos++] = *k++;
 623                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
 624                         ++k;
 625         } else {
 626                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
 627                         if (__get_user(reg, u++))
 628                                 return -EFAULT;
 629                         regs[pos++] = reg;
 630                 }
 631                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
 632                         if (__get_user(reg, u++))
 633                                 return -EFAULT;
 634         }
 635
 636         if (count > 0 && pos == PT_TRAP) {
 637                 if (kbuf)
 638                         reg = *k++;
 639                 else if (__get_user(reg, u++))
 640                         return -EFAULT;
 641                 set_user_trap(target, reg);
 642                 ++pos;
 643                 --count;
 644         }
 645
 646         kbuf = k;
 647         ubuf = u;
 648         pos *= sizeof(reg);
 649         count *= sizeof(reg);
 650         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 651                                          (PT_TRAP + 1) * sizeof(reg), -1);
 652 }
 653
 654 /*
 655  * These are the regset flavors matching the CONFIG_PPC32 native set.
 656  */
 657 static const struct user_regset compat_regsets[] = {
 658         [REGSET_GPR] = {
 659                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 660                 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
 661                 .get = gpr32_get, .set = gpr32_set
 662         },
 663         [REGSET_FPR] = {
 664                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 665                 .size = sizeof(double), .align = sizeof(double),
 666                 .get = fpr_get, .set = fpr_set
 667         },
 668 #ifdef CONFIG_ALTIVEC
 669         [REGSET_VMX] = {
 670                 .core_note_type = NT_PPC_VMX, .n = 34,
 671                 .size = sizeof(vector128), .align = sizeof(vector128),
 672                 .active = vr_active, .get = vr_get, .set = vr_set
 673         },
 674 #endif
 675 #ifdef CONFIG_SPE
 676         [REGSET_SPE] = {
 677                 .core_note_type = NT_PPC_SPE, .n = 35,
 678                 .size = sizeof(u32), .align = sizeof(u32),
 679                 .active = evr_active, .get = evr_get, .set = evr_set
 680         },
 681 #endif
 682 };
 683
 684 static const struct user_regset_view user_ppc_compat_view = {
 685         .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
 686         .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
 687 };
 688 #endif  /* CONFIG_PPC64 */
 689
 690 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 691 {
 692 #ifdef CONFIG_PPC64
 693         if (test_tsk_thread_flag(task, TIF_32BIT))
 694                 return &user_ppc_compat_view;
 695 #endif
 696         return &user_ppc_native_view;
 697 }
 698
 699
 700 void user_enable_single_step(struct task_struct *task)
 701 {
 702         struct pt_regs *regs = task->thread.regs;
 703
 704         if (regs != NULL) {
 705 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 706                 task->thread.dbcr0 |= DBCR0_IDM | DBCR0_IC;
 707                 regs->msr |= MSR_DE;
 708 #else
 709                 regs->msr |= MSR_SE;
 710 #endif
 711         }
 712         set_tsk_thread_flag(task, TIF_SINGLESTEP);
 713 }
 714
 715 void user_disable_single_step(struct task_struct *task)
 716 {
 717         struct pt_regs *regs = task->thread.regs;
 718
 719
 720 #if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
 721         /* If DAC then do not single step, skip */
 722         if (task->thread.dabr)
 723                 return;
 724 #endif
 725
 726         if (regs != NULL) {
 727 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 728                 task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_IDM);
 729                 regs->msr &= ~MSR_DE;
 730 #else
 731                 regs->msr &= ~MSR_SE;
 732 #endif
 733         }
 734         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
 735 }
 736
 737 int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
 738                                unsigned long data)
 739 {
 740         /* For ppc64 we support one DABR and no IABR's at the moment (ppc64).
 741          *  For embedded processors we support one DAC and no IAC's at the
 742          *  moment.
 743          */
 744         if (addr > 0)
 745                 return -EINVAL;
 746
 747         if ((data & ~0x7UL) >= TASK_SIZE)
 748                 return -EIO;
 749
 750 #ifdef CONFIG_PPC64
 751
 752         /* For processors using DABR (i.e. 970), the bottom 3 bits are flags.
 753          *  It was assumed, on previous implementations, that 3 bits were
 754          *  passed together with the data address, fitting the design of the
 755          *  DABR register, as follows:
 756          *
 757          *  bit 0: Read flag
 758          *  bit 1: Write flag
 759          *  bit 2: Breakpoint translation
 760          *
 761          *  Thus, we use them here as so.
 762          */
 763
 764         /* Ensure breakpoint translation bit is set */
 765         if (data && !(data & DABR_TRANSLATION))
 766                 return -EIO;
 767
 768         /* Move contents to the DABR register */
 769         task->thread.dabr = data;
 770
 771 #endif
 772 #if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
 773
 774         /* As described above, it was assumed 3 bits were passed with the data
 775          *  address, but we will assume only the mode bits will be passed
 776          *  as to not cause alignment restrictions for DAC-based processors.
 777          */
 778
 779         /* DAC's hold the whole address without any mode flags */
 780         task->thread.dabr = data & ~0x3UL;
 781
 782         if (task->thread.dabr == 0) {
 783                 task->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W | DBCR0_IDM);
 784                 task->thread.regs->msr &= ~MSR_DE;
 785                 return 0;
 786         }
 787
 788         /* Read or Write bits must be set */
 789
 790         if (!(data & 0x3UL))
 791                 return -EINVAL;
 792
 793         /* Set the Internal Debugging flag (IDM bit 1) for the DBCR0
 794            register */
 795         task->thread.dbcr0 = DBCR0_IDM;
 796
 797         /* Check for write and read flags and set DBCR0
 798            accordingly */
 799         if (data & 0x1UL)
 800                 task->thread.dbcr0 |= DBSR_DAC1R;
 801         if (data & 0x2UL)
 802                 task->thread.dbcr0 |= DBSR_DAC1W;
 803
 804         task->thread.regs->msr |= MSR_DE;
 805 #endif
 806         return 0;
 807 }
 808
 809 /*
 810  * Called by kernel/ptrace.c when detaching..
 811  *
 812  * Make sure single step bits etc are not set.
 813  */
 814 void ptrace_disable(struct task_struct *child)
 815 {
 816         /* make sure the single step bit is not set. */
 817         user_disable_single_step(child);
 818 }
 819
 820 /*
 821  * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
 822  * we mark them as obsolete now, they will be removed in a future version
 823  */
 824 static long arch_ptrace_old(struct task_struct *child, long request, long addr,
 825                             long data)
 826 {
 827         switch (request) {
 828         case PPC_PTRACE_GETREGS:        /* Get GPRs 0 - 31. */
 829                 return copy_regset_to_user(child, &user_ppc_native_view,
 830                                            REGSET_GPR, 0, 32 * sizeof(long),
 831                                            (void __user *) data);
 832
 833         case PPC_PTRACE_SETREGS:        /* Set GPRs 0 - 31. */
 834                 return copy_regset_from_user(child, &user_ppc_native_view,
 835                                              REGSET_GPR, 0, 32 * sizeof(long),
 836                                              (const void __user *) data);
 837
 838         case PPC_PTRACE_GETFPREGS:      /* Get FPRs 0 - 31. */
 839                 return copy_regset_to_user(child, &user_ppc_native_view,
 840                                            REGSET_FPR, 0, 32 * sizeof(double),
 841                                            (void __user *) data);
 842
 843         case PPC_PTRACE_SETFPREGS:      /* Set FPRs 0 - 31. */
 844                 return copy_regset_from_user(child, &user_ppc_native_view,
 845                                              REGSET_FPR, 0, 32 * sizeof(double),
 846                                              (const void __user *) data);
 847         }
 848
 849         return -EPERM;
 850 }
 851
 852 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 853 {
 854         int ret = -EPERM;
 855
 856         switch (request) {
 857         /* read the word at location addr in the USER area. */
 858         case PTRACE_PEEKUSR: {
 859                 unsigned long index, tmp;
 860
 861                 ret = -EIO;
 862                 /* convert to index and check */
 863 #ifdef CONFIG_PPC32
 864                 index = (unsigned long) addr >> 2;
 865                 if ((addr & 3) || (index > PT_FPSCR)
 866                     || (child->thread.regs == NULL))
 867 #else
 868                 index = (unsigned long) addr >> 3;
 869                 if ((addr & 7) || (index > PT_FPSCR))
 870 #endif
 871                         break;
 872
 873                 CHECK_FULL_REGS(child->thread.regs);
 874                 if (index < PT_FPR0) {
 875                         tmp = ptrace_get_reg(child, (int) index);
 876                 } else {
 877                         flush_fp_to_thread(child);
 878                         tmp = ((unsigned long *)child->thread.fpr)
 879                                 [TS_FPRWIDTH * (index - PT_FPR0)];
 880                 }
 881                 ret = put_user(tmp,(unsigned long __user *) data);
 882                 break;
 883         }
 884
 885         /* write the word at location addr in the USER area */
 886         case PTRACE_POKEUSR: {
 887                 unsigned long index;
 888
 889                 ret = -EIO;
 890                 /* convert to index and check */
 891 #ifdef CONFIG_PPC32
 892                 index = (unsigned long) addr >> 2;
 893                 if ((addr & 3) || (index > PT_FPSCR)
 894                     || (child->thread.regs == NULL))
 895 #else
 896                 index = (unsigned long) addr >> 3;
 897                 if ((addr & 7) || (index > PT_FPSCR))
 898 #endif
 899                         break;
 900
 901                 CHECK_FULL_REGS(child->thread.regs);
 902                 if (index < PT_FPR0) {
 903                         ret = ptrace_put_reg(child, index, data);
 904                 } else {
 905                         flush_fp_to_thread(child);
 906                         ((unsigned long *)child->thread.fpr)
 907                                 [TS_FPRWIDTH * (index - PT_FPR0)] = data;
 908                         ret = 0;
 909                 }
 910                 break;
 911         }
 912
 913         case PTRACE_GET_DEBUGREG: {
 914                 ret = -EINVAL;
 915                 /* We only support one DABR and no IABRS at the moment */
 916                 if (addr > 0)
 917                         break;
 918                 ret = put_user(child->thread.dabr,
 919                                (unsigned long __user *)data);
 920                 break;
 921         }
 922
 923         case PTRACE_SET_DEBUGREG:
 924                 ret = ptrace_set_debugreg(child, addr, data);
 925                 break;
 926
 927 #ifdef CONFIG_PPC64
 928         case PTRACE_GETREGS64:
 929 #endif
 930         case PTRACE_GETREGS:    /* Get all pt_regs from the child. */
 931                 return copy_regset_to_user(child, &user_ppc_native_view,
 932                                            REGSET_GPR,
 933                                            0, sizeof(struct pt_regs),
 934                                            (void __user *) data);
 935
 936 #ifdef CONFIG_PPC64
 937         case PTRACE_SETREGS64:
 938 #endif
 939         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
 940                 return copy_regset_from_user(child, &user_ppc_native_view,
 941                                              REGSET_GPR,
 942                                              0, sizeof(struct pt_regs),
 943                                              (const void __user *) data);
 944
 945         case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
 946                 return copy_regset_to_user(child, &user_ppc_native_view,
 947                                            REGSET_FPR,
 948                                            0, sizeof(elf_fpregset_t),
 949                                            (void __user *) data);
 950
 951         case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
 952                 return copy_regset_from_user(child, &user_ppc_native_view,
 953                                              REGSET_FPR,
 954                                              0, sizeof(elf_fpregset_t),
 955                                              (const void __user *) data);
 956
 957 #ifdef CONFIG_ALTIVEC
 958         case PTRACE_GETVRREGS:
 959                 return copy_regset_to_user(child, &user_ppc_native_view,
 960                                            REGSET_VMX,
 961                                            0, (33 * sizeof(vector128) +
 962                                                sizeof(u32)),
 963                                            (void __user *) data);
 964
 965         case PTRACE_SETVRREGS:
 966                 return copy_regset_from_user(child, &user_ppc_native_view,
 967                                              REGSET_VMX,
 968                                              0, (33 * sizeof(vector128) +
 969                                                  sizeof(u32)),
 970                                              (const void __user *) data);
 971 #endif
 972 #ifdef CONFIG_VSX
 973         case PTRACE_GETVSRREGS:
 974                 return copy_regset_to_user(child, &user_ppc_native_view,
 975                                            REGSET_VSX,
 976                                            0, (32 * sizeof(vector128) +
 977                                                sizeof(u32)),
 978                                            (void __user *) data);
 979
 980         case PTRACE_SETVSRREGS:
 981                 return copy_regset_from_user(child, &user_ppc_native_view,
 982                                              REGSET_VSX,
 983                                              0, (32 * sizeof(vector128) +
 984                                                  sizeof(u32)),
 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 static void do_syscall_trace(void)
1017 {
1018         /* the 0x80 provides a way for the tracing parent to distinguish
1019            between a syscall stop and SIGTRAP delivery */
1020         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
1021                                  ? 0x80 : 0));
1022
1023         /*
1024          * this isn't the same as continuing with a signal, but it will do
1025          * for normal use.  strace only continues with a signal if the
1026          * stopping signal is not SIGTRAP.  -brl
1027          */
1028         if (current->exit_code) {
1029                 send_sig(current->exit_code, current, 1);
1030                 current->exit_code = 0;
1031         }
1032 }
1033
1034 void do_syscall_trace_enter(struct pt_regs *regs)
1035 {
1036         secure_computing(regs->gpr[0]);
1037
1038         if (test_thread_flag(TIF_SYSCALL_TRACE)
1039             && (current->ptrace & PT_PTRACED))
1040                 do_syscall_trace();
1041
1042         if (unlikely(current->audit_context)) {
1043 #ifdef CONFIG_PPC64
1044                 if (!test_thread_flag(TIF_32BIT))
1045                         audit_syscall_entry(AUDIT_ARCH_PPC64,
1046                                             regs->gpr[0],
1047                                             regs->gpr[3], regs->gpr[4],
1048                                             regs->gpr[5], regs->gpr[6]);
1049                 else
1050 #endif
1051                         audit_syscall_entry(AUDIT_ARCH_PPC,
1052                                             regs->gpr[0],
1053                                             regs->gpr[3] & 0xffffffff,
1054                                             regs->gpr[4] & 0xffffffff,
1055                                             regs->gpr[5] & 0xffffffff,
1056                                             regs->gpr[6] & 0xffffffff);
1057         }
1058 }
1059
1060 void do_syscall_trace_leave(struct pt_regs *regs)
1061 {
1062         if (unlikely(current->audit_context))
1063                 audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
1064                                    regs->result);
1065
1066         if ((test_thread_flag(TIF_SYSCALL_TRACE)
1067              || test_thread_flag(TIF_SINGLESTEP))
1068             && (current->ptrace & PT_PTRACED))
1069                 do_syscall_trace();
1070 }