arch/sparc64/kernel/ptrace.c

   1 /* ptrace.c: Sparc process tracing support.
   2  *
   3  * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  *
   6  * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
   7  * and David Mosberger.
   8  *
   9  * Added Linux support -miguel (weird, eh?, the original code was meant
  10  * to emulate SunOS).
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/sched.h>
  15 #include <linux/mm.h>
  16 #include <linux/errno.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/user.h>
  19 #include <linux/smp.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/security.h>
  22 #include <linux/seccomp.h>
  23 #include <linux/audit.h>
  24 #include <linux/signal.h>
  25 #include <linux/regset.h>
  26 #include <linux/compat.h>
  27 #include <linux/elf.h>
  28
  29 #include <asm/asi.h>
  30 #include <asm/pgtable.h>
  31 #include <asm/system.h>
  32 #include <asm/uaccess.h>
  33 #include <asm/psrcompat.h>
  34 #include <asm/visasm.h>
  35 #include <asm/spitfire.h>
  36 #include <asm/page.h>
  37 #include <asm/cpudata.h>
  38 #include <asm/cacheflush.h>
  39
  40 #include "entry.h"
  41
  42 /* #define ALLOW_INIT_TRACING */
  43
  44 /*
  45  * Called by kernel/ptrace.c when detaching..
  46  *
  47  * Make sure single step bits etc are not set.
  48  */
  49 void ptrace_disable(struct task_struct *child)
  50 {
  51         /* nothing to do */
  52 }
  53
  54 /* To get the necessary page struct, access_process_vm() first calls
  55  * get_user_pages().  This has done a flush_dcache_page() on the
  56  * accessed page.  Then our caller (copy_{to,from}_user_page()) did
  57  * to memcpy to read/write the data from that page.
  58  *
  59  * Now, the only thing we have to do is:
  60  * 1) flush the D-cache if it's possible than an illegal alias
  61  *    has been created
  62  * 2) flush the I-cache if this is pre-cheetah and we did a write
  63  */
  64 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
  65                          unsigned long uaddr, void *kaddr,
  66                          unsigned long len, int write)
  67 {
  68         BUG_ON(len > PAGE_SIZE);
  69
  70         if (tlb_type == hypervisor)
  71                 return;
  72
  73         preempt_disable();
  74
  75 #ifdef DCACHE_ALIASING_POSSIBLE
  76         /* If bit 13 of the kernel address we used to access the
  77          * user page is the same as the virtual address that page
  78          * is mapped to in the user's address space, we can skip the
  79          * D-cache flush.
  80          */
  81         if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
  82                 unsigned long start = __pa(kaddr);
  83                 unsigned long end = start + len;
  84                 unsigned long dcache_line_size;
  85
  86                 dcache_line_size = local_cpu_data().dcache_line_size;
  87
  88                 if (tlb_type == spitfire) {
  89                         for (; start < end; start += dcache_line_size)
  90                                 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
  91                 } else {
  92                         start &= ~(dcache_line_size - 1);
  93                         for (; start < end; start += dcache_line_size)
  94                                 __asm__ __volatile__(
  95                                         "stxa %%g0, [%0] %1\n\t"
  96                                         "membar #Sync"
  97                                         : /* no outputs */
  98                                         : "r" (start),
  99                                         "i" (ASI_DCACHE_INVALIDATE));
 100                 }
 101         }
 102 #endif
 103         if (write && tlb_type == spitfire) {
 104                 unsigned long start = (unsigned long) kaddr;
 105                 unsigned long end = start + len;
 106                 unsigned long icache_line_size;
 107
 108                 icache_line_size = local_cpu_data().icache_line_size;
 109
 110                 for (; start < end; start += icache_line_size)
 111                         flushi(start);
 112         }
 113
 114         preempt_enable();
 115 }
 116
 117 enum sparc_regset {
 118         REGSET_GENERAL,
 119         REGSET_FP,
 120 };
 121
 122 static int genregs64_get(struct task_struct *target,
 123                          const struct user_regset *regset,
 124                          unsigned int pos, unsigned int count,
 125                          void *kbuf, void __user *ubuf)
 126 {
 127         const struct pt_regs *regs = task_pt_regs(target);
 128         int ret;
 129
 130         if (target == current)
 131                 flushw_user();
 132
 133         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 134                                   regs->u_regs,
 135                                   0, 16 * sizeof(u64));
 136         if (!ret) {
 137                 unsigned long __user *reg_window = (unsigned long __user *)
 138                         (regs->u_regs[UREG_I6] + STACK_BIAS);
 139                 unsigned long window[16];
 140
 141                 if (copy_from_user(window, reg_window, sizeof(window)))
 142                         return -EFAULT;
 143
 144                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 145                                           window,
 146                                           16 * sizeof(u64),
 147                                           32 * sizeof(u64));
 148         }
 149
 150         if (!ret) {
 151                 /* TSTATE, TPC, TNPC */
 152                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 153                                           &regs->tstate,
 154                                           32 * sizeof(u64),
 155                                           35 * sizeof(u64));
 156         }
 157
 158         if (!ret) {
 159                 unsigned long y = regs->y;
 160
 161                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 162                                           &y,
 163                                           35 * sizeof(u64),
 164                                           36 * sizeof(u64));
 165         }
 166
 167         if (!ret)
 168                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 169                                                36 * sizeof(u64), -1);
 170
 171         return ret;
 172 }
 173
 174 static int genregs64_set(struct task_struct *target,
 175                          const struct user_regset *regset,
 176                          unsigned int pos, unsigned int count,
 177                          const void *kbuf, const void __user *ubuf)
 178 {
 179         struct pt_regs *regs = task_pt_regs(target);
 180         int ret;
 181
 182         if (target == current)
 183                 flushw_user();
 184
 185         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 186                                  regs->u_regs,
 187                                  0, 16 * sizeof(u64));
 188         if (!ret && count > 0) {
 189                 unsigned long __user *reg_window = (unsigned long __user *)
 190                         (regs->u_regs[UREG_I6] + STACK_BIAS);
 191                 unsigned long window[16];
 192
 193                 if (copy_from_user(window, reg_window, sizeof(window)))
 194                         return -EFAULT;
 195
 196                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 197                                          window,
 198                                          16 * sizeof(u64),
 199                                          32 * sizeof(u64));
 200                 if (!ret &&
 201                     copy_to_user(reg_window, window, sizeof(window)))
 202                         return -EFAULT;
 203         }
 204
 205         if (!ret && count > 0) {
 206                 unsigned long tstate;
 207
 208                 /* TSTATE */
 209                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 210                                          &tstate,
 211                                          32 * sizeof(u64),
 212                                          33 * sizeof(u64));
 213                 if (!ret) {
 214                         /* Only the condition codes can be modified
 215                          * in the %tstate register.
 216                          */
 217                         tstate &= (TSTATE_ICC | TSTATE_XCC);
 218                         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 219                         regs->tstate |= tstate;
 220                 }
 221         }
 222
 223         if (!ret) {
 224                 /* TPC, TNPC */
 225                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 226                                          &regs->tpc,
 227                                          33 * sizeof(u64),
 228                                          35 * sizeof(u64));
 229         }
 230
 231         if (!ret) {
 232                 unsigned long y;
 233
 234                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 235                                          &y,
 236                                          35 * sizeof(u64),
 237                                          36 * sizeof(u64));
 238                 if (!ret)
 239                         regs->y = y;
 240         }
 241
 242         if (!ret)
 243                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 244                                                 36 * sizeof(u64), -1);
 245
 246         return ret;
 247 }
 248
 249 static int fpregs64_get(struct task_struct *target,
 250                         const struct user_regset *regset,
 251                         unsigned int pos, unsigned int count,
 252                         void *kbuf, void __user *ubuf)
 253 {
 254         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 255         unsigned long fprs, fsr, gsr;
 256         int ret;
 257
 258         if (target == current)
 259                 save_and_clear_fpu();
 260
 261         fprs = task_thread_info(target)->fpsaved[0];
 262
 263         if (fprs & FPRS_DL)
 264                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 265                                           fpregs,
 266                                           0, 16 * sizeof(u64));
 267         else
 268                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 269                                                0,
 270                                                16 * sizeof(u64));
 271
 272         if (!ret) {
 273                 if (fprs & FPRS_DU)
 274                         ret = user_regset_copyout(&pos, &count,
 275                                                   &kbuf, &ubuf,
 276                                                   fpregs + 16,
 277                                                   16 * sizeof(u64),
 278                                                   32 * sizeof(u64));
 279                 else
 280                         ret = user_regset_copyout_zero(&pos, &count,
 281                                                        &kbuf, &ubuf,
 282                                                        16 * sizeof(u64),
 283                                                        32 * sizeof(u64));
 284         }
 285
 286         if (fprs & FPRS_FEF) {
 287                 fsr = task_thread_info(target)->xfsr[0];
 288                 gsr = task_thread_info(target)->gsr[0];
 289         } else {
 290                 fsr = gsr = 0;
 291         }
 292
 293         if (!ret)
 294                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 295                                           &fsr,
 296                                           32 * sizeof(u64),
 297                                           33 * sizeof(u64));
 298         if (!ret)
 299                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 300                                           &gsr,
 301                                           33 * sizeof(u64),
 302                                           34 * sizeof(u64));
 303         if (!ret)
 304                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 305                                           &fprs,
 306                                           34 * sizeof(u64),
 307                                           35 * sizeof(u64));
 308
 309         if (!ret)
 310                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 311                                                35 * sizeof(u64), -1);
 312
 313         return ret;
 314 }
 315
 316 static int fpregs64_set(struct task_struct *target,
 317                         const struct user_regset *regset,
 318                         unsigned int pos, unsigned int count,
 319                         const void *kbuf, const void __user *ubuf)
 320 {
 321         unsigned long *fpregs = task_thread_info(target)->fpregs;
 322         unsigned long fprs;
 323         int ret;
 324
 325         if (target == current)
 326                 save_and_clear_fpu();
 327
 328         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 329                                  fpregs,
 330                                  0, 32 * sizeof(u64));
 331         if (!ret)
 332                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 333                                          task_thread_info(target)->xfsr,
 334                                          32 * sizeof(u64),
 335                                          33 * sizeof(u64));
 336         if (!ret)
 337                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 338                                          task_thread_info(target)->gsr,
 339                                          33 * sizeof(u64),
 340                                          34 * sizeof(u64));
 341
 342         fprs = task_thread_info(target)->fpsaved[0];
 343         if (!ret && count > 0) {
 344                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 345                                          &fprs,
 346                                          34 * sizeof(u64),
 347                                          35 * sizeof(u64));
 348         }
 349
 350         fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 351         task_thread_info(target)->fpsaved[0] = fprs;
 352
 353         if (!ret)
 354                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 355                                                 35 * sizeof(u64), -1);
 356         return ret;
 357 }
 358
 359 static const struct user_regset sparc64_regsets[] = {
 360         /* Format is:
 361          *      G0 --> G7
 362          *      O0 --> O7
 363          *      L0 --> L7
 364          *      I0 --> I7
 365          *      TSTATE, TPC, TNPC, Y
 366          */
 367         [REGSET_GENERAL] = {
 368                 .core_note_type = NT_PRSTATUS,
 369                 .n = 36 * sizeof(u64),
 370                 .size = sizeof(u64), .align = sizeof(u64),
 371                 .get = genregs64_get, .set = genregs64_set
 372         },
 373         /* Format is:
 374          *      F0 --> F63
 375          *      FSR
 376          *      GSR
 377          *      FPRS
 378          */
 379         [REGSET_FP] = {
 380                 .core_note_type = NT_PRFPREG,
 381                 .n = 35 * sizeof(u64),
 382                 .size = sizeof(u64), .align = sizeof(u64),
 383                 .get = fpregs64_get, .set = fpregs64_set
 384         },
 385 };
 386
 387 static const struct user_regset_view user_sparc64_view = {
 388         .name = "sparc64", .e_machine = EM_SPARCV9,
 389         .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
 390 };
 391
 392 #ifdef CONFIG_COMPAT
 393 static int genregs32_get(struct task_struct *target,
 394                          const struct user_regset *regset,
 395                          unsigned int pos, unsigned int count,
 396                          void *kbuf, void __user *ubuf)
 397 {
 398         const struct pt_regs *regs = task_pt_regs(target);
 399         compat_ulong_t __user *reg_window;
 400         compat_ulong_t *k = kbuf;
 401         compat_ulong_t __user *u = ubuf;
 402         compat_ulong_t reg;
 403
 404         if (target == current)
 405                 flushw_user();
 406
 407         pos /= sizeof(reg);
 408         count /= sizeof(reg);
 409
 410         if (kbuf) {
 411                 for (; count > 0 && pos < 16; count--)
 412                         *k++ = regs->u_regs[pos++];
 413
 414                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 415                 for (; count > 0 && pos < 32; count--) {
 416                         if (get_user(*k++, &reg_window[pos++]))
 417                                 return -EFAULT;
 418                 }
 419         } else {
 420                 for (; count > 0 && pos < 16; count--) {
 421                         if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
 422                                 return -EFAULT;
 423                 }
 424
 425                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 426                 for (; count > 0 && pos < 32; count--) {
 427                         if (get_user(reg, &reg_window[pos++]) ||
 428                             put_user(reg, u++))
 429                                 return -EFAULT;
 430                 }
 431         }
 432         while (count > 0) {
 433                 switch (pos) {
 434                 case 32: /* PSR */
 435                         reg = tstate_to_psr(regs->tstate);
 436                         break;
 437                 case 33: /* PC */
 438                         reg = regs->tpc;
 439                         break;
 440                 case 34: /* NPC */
 441                         reg = regs->tnpc;
 442                         break;
 443                 case 35: /* Y */
 444                         reg = regs->y;
 445                         break;
 446                 case 36: /* WIM */
 447                 case 37: /* TBR */
 448                         reg = 0;
 449                         break;
 450                 default:
 451                         goto finish;
 452                 }
 453
 454                 if (kbuf)
 455                         *k++ = reg;
 456                 else if (put_user(reg, u++))
 457                         return -EFAULT;
 458                 pos++;
 459                 count--;
 460         }
 461 finish:
 462         pos *= sizeof(reg);
 463         count *= sizeof(reg);
 464
 465         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 466                                         38 * sizeof(reg), -1);
 467 }
 468
 469 static int genregs32_set(struct task_struct *target,
 470                          const struct user_regset *regset,
 471                          unsigned int pos, unsigned int count,
 472                          const void *kbuf, const void __user *ubuf)
 473 {
 474         struct pt_regs *regs = task_pt_regs(target);
 475         compat_ulong_t __user *reg_window;
 476         const compat_ulong_t *k = kbuf;
 477         const compat_ulong_t __user *u = ubuf;
 478         compat_ulong_t reg;
 479
 480         if (target == current)
 481                 flushw_user();
 482
 483         pos /= sizeof(reg);
 484         count /= sizeof(reg);
 485
 486         if (kbuf) {
 487                 for (; count > 0 && pos < 16; count--)
 488                         regs->u_regs[pos++] = *k++;
 489
 490                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 491                 for (; count > 0 && pos < 32; count--) {
 492                         if (put_user(*k++, &reg_window[pos++]))
 493                                 return -EFAULT;
 494                 }
 495         } else {
 496                 for (; count > 0 && pos < 16; count--) {
 497                         if (get_user(reg, u++))
 498                                 return -EFAULT;
 499                         regs->u_regs[pos++] = reg;
 500                 }
 501
 502                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 503                 for (; count > 0 && pos < 32; count--) {
 504                         if (get_user(reg, u++) ||
 505                             put_user(reg, &reg_window[pos++]))
 506                                 return -EFAULT;
 507                 }
 508         }
 509         while (count > 0) {
 510                 unsigned long tstate;
 511
 512                 if (kbuf)
 513                         reg = *k++;
 514                 else if (get_user(reg, u++))
 515                         return -EFAULT;
 516
 517                 switch (pos) {
 518                 case 32: /* PSR */
 519                         tstate = regs->tstate;
 520                         tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 521                         tstate |= psr_to_tstate_icc(reg);
 522                         regs->tstate = tstate;
 523                         break;
 524                 case 33: /* PC */
 525                         regs->tpc = reg;
 526                         break;
 527                 case 34: /* NPC */
 528                         regs->tnpc = reg;
 529                         break;
 530                 case 35: /* Y */
 531                         regs->y = reg;
 532                         break;
 533                 case 36: /* WIM */
 534                 case 37: /* TBR */
 535                         break;
 536                 default:
 537                         goto finish;
 538                 }
 539
 540                 pos++;
 541                 count--;
 542         }
 543 finish:
 544         pos *= sizeof(reg);
 545         count *= sizeof(reg);
 546
 547         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 548                                          38 * sizeof(reg), -1);
 549 }
 550
 551 static int fpregs32_get(struct task_struct *target,
 552                         const struct user_regset *regset,
 553                         unsigned int pos, unsigned int count,
 554                         void *kbuf, void __user *ubuf)
 555 {
 556         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 557         compat_ulong_t enabled;
 558         unsigned long fprs;
 559         compat_ulong_t fsr;
 560         int ret = 0;
 561
 562         if (target == current)
 563                 save_and_clear_fpu();
 564
 565         fprs = task_thread_info(target)->fpsaved[0];
 566         if (fprs & FPRS_FEF) {
 567                 fsr = task_thread_info(target)->xfsr[0];
 568                 enabled = 1;
 569         } else {
 570                 fsr = 0;
 571                 enabled = 0;
 572         }
 573
 574         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 575                                   fpregs,
 576                                   0, 32 * sizeof(u32));
 577
 578         if (!ret)
 579                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 580                                                32 * sizeof(u32),
 581                                                33 * sizeof(u32));
 582         if (!ret)
 583                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 584                                           &fsr,
 585                                           33 * sizeof(u32),
 586                                           34 * sizeof(u32));
 587
 588         if (!ret) {
 589                 compat_ulong_t val;
 590
 591                 val = (enabled << 8) | (8 << 16);
 592                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 593                                           &val,
 594                                           34 * sizeof(u32),
 595                                           35 * sizeof(u32));
 596         }
 597
 598         if (!ret)
 599                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 600                                                35 * sizeof(u32), -1);
 601
 602         return ret;
 603 }
 604
 605 static int fpregs32_set(struct task_struct *target,
 606                         const struct user_regset *regset,
 607                         unsigned int pos, unsigned int count,
 608                         const void *kbuf, const void __user *ubuf)
 609 {
 610         unsigned long *fpregs = task_thread_info(target)->fpregs;
 611         unsigned long fprs;
 612         int ret;
 613
 614         if (target == current)
 615                 save_and_clear_fpu();
 616
 617         fprs = task_thread_info(target)->fpsaved[0];
 618
 619         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 620                                  fpregs,
 621                                  0, 32 * sizeof(u32));
 622         if (!ret)
 623                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 624                                           32 * sizeof(u32),
 625                                           33 * sizeof(u32));
 626         if (!ret && count > 0) {
 627                 compat_ulong_t fsr;
 628                 unsigned long val;
 629
 630                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 631                                          &fsr,
 632                                          33 * sizeof(u32),
 633                                          34 * sizeof(u32));
 634                 if (!ret) {
 635                         val = task_thread_info(target)->xfsr[0];
 636                         val &= 0xffffffff00000000UL;
 637                         val |= fsr;
 638                         task_thread_info(target)->xfsr[0] = val;
 639                 }
 640         }
 641
 642         fprs |= (FPRS_FEF | FPRS_DL);
 643         task_thread_info(target)->fpsaved[0] = fprs;
 644
 645         if (!ret)
 646                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 647                                                 34 * sizeof(u32), -1);
 648         return ret;
 649 }
 650
 651 static const struct user_regset sparc32_regsets[] = {
 652         /* Format is:
 653          *      G0 --> G7
 654          *      O0 --> O7
 655          *      L0 --> L7
 656          *      I0 --> I7
 657          *      PSR, PC, nPC, Y, WIM, TBR
 658          */
 659         [REGSET_GENERAL] = {
 660                 .core_note_type = NT_PRSTATUS,
 661                 .n = 38 * sizeof(u32),
 662                 .size = sizeof(u32), .align = sizeof(u32),
 663                 .get = genregs32_get, .set = genregs32_set
 664         },
 665         /* Format is:
 666          *      F0 --> F31
 667          *      empty 32-bit word
 668          *      FSR (32--bit word)
 669          *      FPU QUEUE COUNT (8-bit char)
 670          *      FPU QUEUE ENTRYSIZE (8-bit char)
 671          *      FPU ENABLED (8-bit char)
 672          *      empty 8-bit char
 673          *      FPU QUEUE (64 32-bit ints)
 674          */
 675         [REGSET_FP] = {
 676                 .core_note_type = NT_PRFPREG,
 677                 .n = 99 * sizeof(u32),
 678                 .size = sizeof(u32), .align = sizeof(u32),
 679                 .get = fpregs32_get, .set = fpregs32_set
 680         },
 681 };
 682
 683 static const struct user_regset_view user_sparc32_view = {
 684         .name = "sparc", .e_machine = EM_SPARC,
 685         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 686 };
 687 #endif /* CONFIG_COMPAT */
 688
 689 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 690 {
 691 #ifdef CONFIG_COMPAT
 692         if (test_tsk_thread_flag(task, TIF_32BIT))
 693                 return &user_sparc32_view;
 694 #endif
 695         return &user_sparc64_view;
 696 }
 697
 698 #ifdef CONFIG_COMPAT
 699 struct compat_fps {
 700         unsigned int regs[32];
 701         unsigned int fsr;
 702         unsigned int flags;
 703         unsigned int extra;
 704         unsigned int fpqd;
 705         struct compat_fq {
 706                 unsigned int insnaddr;
 707                 unsigned int insn;
 708         } fpq[16];
 709 };
 710
 711 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 712                         compat_ulong_t caddr, compat_ulong_t cdata)
 713 {
 714         const struct user_regset_view *view = task_user_regset_view(child);
 715         compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
 716         struct pt_regs32 __user *pregs;
 717         struct compat_fps __user *fps;
 718         unsigned long addr2 = caddr2;
 719         unsigned long addr = caddr;
 720         unsigned long data = cdata;
 721         int ret;
 722
 723         pregs = (struct pt_regs32 __user *) addr;
 724         fps = (struct compat_fps __user *) addr;
 725
 726         switch (request) {
 727         case PTRACE_PEEKUSR:
 728                 ret = (addr != 0) ? -EIO : 0;
 729                 break;
 730
 731         case PTRACE_GETREGS:
 732                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 733                                           32 * sizeof(u32),
 734                                           4 * sizeof(u32),
 735                                           &pregs->psr);
 736                 if (!ret)
 737                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 738                                                   1 * sizeof(u32),
 739                                                   15 * sizeof(u32),
 740                                                   &pregs->u_regs[0]);
 741                 break;
 742
 743         case PTRACE_SETREGS:
 744                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 745                                             32 * sizeof(u32),
 746                                             4 * sizeof(u32),
 747                                             &pregs->psr);
 748                 if (!ret)
 749                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 750                                                     1 * sizeof(u32),
 751                                                     15 * sizeof(u32),
 752                                                     &pregs->u_regs[0]);
 753                 break;
 754
 755         case PTRACE_GETFPREGS:
 756                 ret = copy_regset_to_user(child, view, REGSET_FP,
 757                                           0 * sizeof(u32),
 758                                           32 * sizeof(u32),
 759                                           &fps->regs[0]);
 760                 if (!ret)
 761                         ret = copy_regset_to_user(child, view, REGSET_FP,
 762                                                   33 * sizeof(u32),
 763                                                   1 * sizeof(u32),
 764                                                   &fps->fsr);
 765                 if (!ret) {
 766                         if (__put_user(0, &fps->flags) ||
 767                             __put_user(0, &fps->extra) ||
 768                             __put_user(0, &fps->fpqd) ||
 769                             clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
 770                                 ret = -EFAULT;
 771                 }
 772                 break;
 773
 774         case PTRACE_SETFPREGS:
 775                 ret = copy_regset_from_user(child, view, REGSET_FP,
 776                                             0 * sizeof(u32),
 777                                             32 * sizeof(u32),
 778                                             &fps->regs[0]);
 779                 if (!ret)
 780                         ret = copy_regset_from_user(child, view, REGSET_FP,
 781                                                     33 * sizeof(u32),
 782                                                     1 * sizeof(u32),
 783                                                     &fps->fsr);
 784                 break;
 785
 786         case PTRACE_READTEXT:
 787         case PTRACE_READDATA:
 788                 ret = ptrace_readdata(child, addr,
 789                                       (char __user *)addr2, data);
 790                 if (ret == data)
 791                         ret = 0;
 792                 else if (ret >= 0)
 793                         ret = -EIO;
 794                 break;
 795
 796         case PTRACE_WRITETEXT:
 797         case PTRACE_WRITEDATA:
 798                 ret = ptrace_writedata(child, (char __user *) addr2,
 799                                        addr, data);
 800                 if (ret == data)
 801                         ret = 0;
 802                 else if (ret >= 0)
 803                         ret = -EIO;
 804                 break;
 805
 806         default:
 807                 ret = compat_ptrace_request(child, request, addr, data);
 808                 break;
 809         }
 810
 811         return ret;
 812 }
 813 #endif /* CONFIG_COMPAT */
 814
 815 struct fps {
 816         unsigned int regs[64];
 817         unsigned long fsr;
 818 };
 819
 820 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 821 {
 822         const struct user_regset_view *view = task_user_regset_view(child);
 823         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
 824         struct pt_regs __user *pregs;
 825         struct fps __user *fps;
 826         int ret;
 827
 828         pregs = (struct pt_regs __user *) (unsigned long) addr;
 829         fps = (struct fps __user *) (unsigned long) addr;
 830
 831         switch (request) {
 832         case PTRACE_PEEKUSR:
 833                 ret = (addr != 0) ? -EIO : 0;
 834                 break;
 835
 836         case PTRACE_GETREGS64:
 837                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 838                                           1 * sizeof(u64),
 839                                           15 * sizeof(u64),
 840                                           &pregs->u_regs[0]);
 841                 if (!ret) {
 842                         /* XXX doesn't handle 'y' register correctly XXX */
 843                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 844                                                   32 * sizeof(u64),
 845                                                   4 * sizeof(u64),
 846                                                   &pregs->tstate);
 847                 }
 848                 break;
 849
 850         case PTRACE_SETREGS64:
 851                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 852                                             1 * sizeof(u64),
 853                                             15 * sizeof(u64),
 854                                             &pregs->u_regs[0]);
 855                 if (!ret) {
 856                         /* XXX doesn't handle 'y' register correctly XXX */
 857                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 858                                                     32 * sizeof(u64),
 859                                                     4 * sizeof(u64),
 860                                                     &pregs->tstate);
 861                 }
 862                 break;
 863
 864         case PTRACE_GETFPREGS64:
 865                 ret = copy_regset_to_user(child, view, REGSET_FP,
 866                                           0 * sizeof(u64),
 867                                           33 * sizeof(u64),
 868                                           fps);
 869                 break;
 870
 871         case PTRACE_SETFPREGS64:
 872                 ret = copy_regset_to_user(child, view, REGSET_FP,
 873                                           0 * sizeof(u64),
 874                                           33 * sizeof(u64),
 875                                           fps);
 876                 break;
 877
 878         case PTRACE_READTEXT:
 879         case PTRACE_READDATA:
 880                 ret = ptrace_readdata(child, addr,
 881                                       (char __user *)addr2, data);
 882                 if (ret == data)
 883                         ret = 0;
 884                 else if (ret >= 0)
 885                         ret = -EIO;
 886                 break;
 887
 888         case PTRACE_WRITETEXT:
 889         case PTRACE_WRITEDATA:
 890                 ret = ptrace_writedata(child, (char __user *) addr2,
 891                                        addr, data);
 892                 if (ret == data)
 893                         ret = 0;
 894                 else if (ret >= 0)
 895                         ret = -EIO;
 896                 break;
 897
 898         default:
 899                 ret = ptrace_request(child, request, addr, data);
 900                 break;
 901         }
 902
 903         return ret;
 904 }
 905
 906 asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
 907 {
 908         /* do the secure computing check first */
 909         secure_computing(regs->u_regs[UREG_G1]);
 910
 911         if (unlikely(current->audit_context) && syscall_exit_p) {
 912                 unsigned long tstate = regs->tstate;
 913                 int result = AUDITSC_SUCCESS;
 914
 915                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
 916                         result = AUDITSC_FAILURE;
 917
 918                 audit_syscall_exit(result, regs->u_regs[UREG_I0]);
 919         }
 920
 921         if (!(current->ptrace & PT_PTRACED))
 922                 goto out;
 923
 924         if (!test_thread_flag(TIF_SYSCALL_TRACE))
 925                 goto out;
 926
 927         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 928                                  ? 0x80 : 0));
 929
 930         /*
 931          * this isn't the same as continuing with a signal, but it will do
 932          * for normal use.  strace only continues with a signal if the
 933          * stopping signal is not SIGTRAP.  -brl
 934          */
 935         if (current->exit_code) {
 936                 send_sig(current->exit_code, current, 1);
 937                 current->exit_code = 0;
 938         }
 939
 940 out:
 941         if (unlikely(current->audit_context) && !syscall_exit_p)
 942                 audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
 943                                      AUDIT_ARCH_SPARC :
 944                                      AUDIT_ARCH_SPARC64),
 945                                     regs->u_regs[UREG_G1],
 946                                     regs->u_regs[UREG_I0],
 947                                     regs->u_regs[UREG_I1],
 948                                     regs->u_regs[UREG_I2],
 949                                     regs->u_regs[UREG_I3]);
 950 }