git.oblomov.eu Git - linux-2.6/blob - 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 (target == current) {
 142                         if (copy_from_user(window, reg_window, sizeof(window)))
 143                                 return -EFAULT;
 144                 } else {
 145                         if (access_process_vm(target,
 146                                               (unsigned long) reg_window,
 147                                               window,
 148                                               sizeof(window), 0) !=
 149                             sizeof(window))
 150                                 return -EFAULT;
 151                 }
 152
 153                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 154                                           window,
 155                                           16 * sizeof(u64),
 156                                           32 * sizeof(u64));
 157         }
 158
 159         if (!ret) {
 160                 /* TSTATE, TPC, TNPC */
 161                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 162                                           &regs->tstate,
 163                                           32 * sizeof(u64),
 164                                           35 * sizeof(u64));
 165         }
 166
 167         if (!ret) {
 168                 unsigned long y = regs->y;
 169
 170                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 171                                           &y,
 172                                           35 * sizeof(u64),
 173                                           36 * sizeof(u64));
 174         }
 175
 176         if (!ret)
 177                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 178                                                36 * sizeof(u64), -1);
 179
 180         return ret;
 181 }
 182
 183 static int genregs64_set(struct task_struct *target,
 184                          const struct user_regset *regset,
 185                          unsigned int pos, unsigned int count,
 186                          const void *kbuf, const void __user *ubuf)
 187 {
 188         struct pt_regs *regs = task_pt_regs(target);
 189         int ret;
 190
 191         if (target == current)
 192                 flushw_user();
 193
 194         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 195                                  regs->u_regs,
 196                                  0, 16 * sizeof(u64));
 197         if (!ret && count > 0) {
 198                 unsigned long __user *reg_window = (unsigned long __user *)
 199                         (regs->u_regs[UREG_I6] + STACK_BIAS);
 200                 unsigned long window[16];
 201
 202                 if (target == current) {
 203                         if (copy_from_user(window, reg_window, sizeof(window)))
 204                                 return -EFAULT;
 205                 } else {
 206                         if (access_process_vm(target,
 207                                               (unsigned long) reg_window,
 208                                               window,
 209                                               sizeof(window), 0) !=
 210                             sizeof(window))
 211                                 return -EFAULT;
 212                 }
 213
 214                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 215                                          window,
 216                                          16 * sizeof(u64),
 217                                          32 * sizeof(u64));
 218                 if (!ret) {
 219                         if (target == current) {
 220                                 if (copy_to_user(reg_window, window,
 221                                                  sizeof(window)))
 222                                         return -EFAULT;
 223                         } else {
 224                                 if (access_process_vm(target,
 225                                                       (unsigned long)
 226                                                       reg_window,
 227                                                       window,
 228                                                       sizeof(window), 1) !=
 229                                     sizeof(window))
 230                                         return -EFAULT;
 231                         }
 232                 }
 233         }
 234
 235         if (!ret && count > 0) {
 236                 unsigned long tstate;
 237
 238                 /* TSTATE */
 239                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 240                                          &tstate,
 241                                          32 * sizeof(u64),
 242                                          33 * sizeof(u64));
 243                 if (!ret) {
 244                         /* Only the condition codes can be modified
 245                          * in the %tstate register.
 246                          */
 247                         tstate &= (TSTATE_ICC | TSTATE_XCC);
 248                         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 249                         regs->tstate |= tstate;
 250                 }
 251         }
 252
 253         if (!ret) {
 254                 /* TPC, TNPC */
 255                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 256                                          &regs->tpc,
 257                                          33 * sizeof(u64),
 258                                          35 * sizeof(u64));
 259         }
 260
 261         if (!ret) {
 262                 unsigned long y;
 263
 264                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 265                                          &y,
 266                                          35 * sizeof(u64),
 267                                          36 * sizeof(u64));
 268                 if (!ret)
 269                         regs->y = y;
 270         }
 271
 272         if (!ret)
 273                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 274                                                 36 * sizeof(u64), -1);
 275
 276         return ret;
 277 }
 278
 279 static int fpregs64_get(struct task_struct *target,
 280                         const struct user_regset *regset,
 281                         unsigned int pos, unsigned int count,
 282                         void *kbuf, void __user *ubuf)
 283 {
 284         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 285         unsigned long fprs, fsr, gsr;
 286         int ret;
 287
 288         if (target == current)
 289                 save_and_clear_fpu();
 290
 291         fprs = task_thread_info(target)->fpsaved[0];
 292
 293         if (fprs & FPRS_DL)
 294                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 295                                           fpregs,
 296                                           0, 16 * sizeof(u64));
 297         else
 298                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 299                                                0,
 300                                                16 * sizeof(u64));
 301
 302         if (!ret) {
 303                 if (fprs & FPRS_DU)
 304                         ret = user_regset_copyout(&pos, &count,
 305                                                   &kbuf, &ubuf,
 306                                                   fpregs + 16,
 307                                                   16 * sizeof(u64),
 308                                                   32 * sizeof(u64));
 309                 else
 310                         ret = user_regset_copyout_zero(&pos, &count,
 311                                                        &kbuf, &ubuf,
 312                                                        16 * sizeof(u64),
 313                                                        32 * sizeof(u64));
 314         }
 315
 316         if (fprs & FPRS_FEF) {
 317                 fsr = task_thread_info(target)->xfsr[0];
 318                 gsr = task_thread_info(target)->gsr[0];
 319         } else {
 320                 fsr = gsr = 0;
 321         }
 322
 323         if (!ret)
 324                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 325                                           &fsr,
 326                                           32 * sizeof(u64),
 327                                           33 * sizeof(u64));
 328         if (!ret)
 329                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 330                                           &gsr,
 331                                           33 * sizeof(u64),
 332                                           34 * sizeof(u64));
 333         if (!ret)
 334                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 335                                           &fprs,
 336                                           34 * sizeof(u64),
 337                                           35 * sizeof(u64));
 338
 339         if (!ret)
 340                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 341                                                35 * sizeof(u64), -1);
 342
 343         return ret;
 344 }
 345
 346 static int fpregs64_set(struct task_struct *target,
 347                         const struct user_regset *regset,
 348                         unsigned int pos, unsigned int count,
 349                         const void *kbuf, const void __user *ubuf)
 350 {
 351         unsigned long *fpregs = task_thread_info(target)->fpregs;
 352         unsigned long fprs;
 353         int ret;
 354
 355         if (target == current)
 356                 save_and_clear_fpu();
 357
 358         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 359                                  fpregs,
 360                                  0, 32 * sizeof(u64));
 361         if (!ret)
 362                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 363                                          task_thread_info(target)->xfsr,
 364                                          32 * sizeof(u64),
 365                                          33 * sizeof(u64));
 366         if (!ret)
 367                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 368                                          task_thread_info(target)->gsr,
 369                                          33 * sizeof(u64),
 370                                          34 * sizeof(u64));
 371
 372         fprs = task_thread_info(target)->fpsaved[0];
 373         if (!ret && count > 0) {
 374                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 375                                          &fprs,
 376                                          34 * sizeof(u64),
 377                                          35 * sizeof(u64));
 378         }
 379
 380         fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 381         task_thread_info(target)->fpsaved[0] = fprs;
 382
 383         if (!ret)
 384                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 385                                                 35 * sizeof(u64), -1);
 386         return ret;
 387 }
 388
 389 static const struct user_regset sparc64_regsets[] = {
 390         /* Format is:
 391          *      G0 --> G7
 392          *      O0 --> O7
 393          *      L0 --> L7
 394          *      I0 --> I7
 395          *      TSTATE, TPC, TNPC, Y
 396          */
 397         [REGSET_GENERAL] = {
 398                 .core_note_type = NT_PRSTATUS,
 399                 .n = 36 * sizeof(u64),
 400                 .size = sizeof(u64), .align = sizeof(u64),
 401                 .get = genregs64_get, .set = genregs64_set
 402         },
 403         /* Format is:
 404          *      F0 --> F63
 405          *      FSR
 406          *      GSR
 407          *      FPRS
 408          */
 409         [REGSET_FP] = {
 410                 .core_note_type = NT_PRFPREG,
 411                 .n = 35 * sizeof(u64),
 412                 .size = sizeof(u64), .align = sizeof(u64),
 413                 .get = fpregs64_get, .set = fpregs64_set
 414         },
 415 };
 416
 417 static const struct user_regset_view user_sparc64_view = {
 418         .name = "sparc64", .e_machine = EM_SPARCV9,
 419         .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
 420 };
 421
 422 #ifdef CONFIG_COMPAT
 423 static int genregs32_get(struct task_struct *target,
 424                          const struct user_regset *regset,
 425                          unsigned int pos, unsigned int count,
 426                          void *kbuf, void __user *ubuf)
 427 {
 428         const struct pt_regs *regs = task_pt_regs(target);
 429         compat_ulong_t __user *reg_window;
 430         compat_ulong_t *k = kbuf;
 431         compat_ulong_t __user *u = ubuf;
 432         compat_ulong_t reg;
 433
 434         if (target == current)
 435                 flushw_user();
 436
 437         pos /= sizeof(reg);
 438         count /= sizeof(reg);
 439
 440         if (kbuf) {
 441                 for (; count > 0 && pos < 16; count--)
 442                         *k++ = regs->u_regs[pos++];
 443
 444                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 445                 if (target == current) {
 446                         for (; count > 0 && pos < 32; count--) {
 447                                 if (get_user(*k++, &reg_window[pos++]))
 448                                         return -EFAULT;
 449                         }
 450                 } else {
 451                         for (; count > 0 && pos < 32; count--) {
 452                                 if (access_process_vm(target,
 453                                                       (unsigned long)
 454                                                       &reg_window[pos],
 455                                                       k, sizeof(*k), 0)
 456                                     != sizeof(*k))
 457                                         return -EFAULT;
 458                                 k++;
 459                                 pos++;
 460                         }
 461                 }
 462         } else {
 463                 for (; count > 0 && pos < 16; count--) {
 464                         if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
 465                                 return -EFAULT;
 466                 }
 467
 468                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 469                 if (target == current) {
 470                         for (; count > 0 && pos < 32; count--) {
 471                                 if (get_user(reg, &reg_window[pos++]) ||
 472                                     put_user(reg, u++))
 473                                         return -EFAULT;
 474                         }
 475                 } else {
 476                         for (; count > 0 && pos < 32; count--) {
 477                                 if (access_process_vm(target,
 478                                                       (unsigned long)
 479                                                       &reg_window[pos],
 480                                                       &reg, sizeof(reg), 0)
 481                                     != sizeof(reg))
 482                                         return -EFAULT;
 483                                 if (access_process_vm(target,
 484                                                       (unsigned long) u,
 485                                                       &reg, sizeof(reg), 1)
 486                                     != sizeof(reg))
 487                                         return -EFAULT;
 488                                 pos++;
 489                                 u++;
 490                         }
 491                 }
 492         }
 493         while (count > 0) {
 494                 switch (pos) {
 495                 case 32: /* PSR */
 496                         reg = tstate_to_psr(regs->tstate);
 497                         break;
 498                 case 33: /* PC */
 499                         reg = regs->tpc;
 500                         break;
 501                 case 34: /* NPC */
 502                         reg = regs->tnpc;
 503                         break;
 504                 case 35: /* Y */
 505                         reg = regs->y;
 506                         break;
 507                 case 36: /* WIM */
 508                 case 37: /* TBR */
 509                         reg = 0;
 510                         break;
 511                 default:
 512                         goto finish;
 513                 }
 514
 515                 if (kbuf)
 516                         *k++ = reg;
 517                 else if (put_user(reg, u++))
 518                         return -EFAULT;
 519                 pos++;
 520                 count--;
 521         }
 522 finish:
 523         pos *= sizeof(reg);
 524         count *= sizeof(reg);
 525
 526         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 527                                         38 * sizeof(reg), -1);
 528 }
 529
 530 static int genregs32_set(struct task_struct *target,
 531                          const struct user_regset *regset,
 532                          unsigned int pos, unsigned int count,
 533                          const void *kbuf, const void __user *ubuf)
 534 {
 535         struct pt_regs *regs = task_pt_regs(target);
 536         compat_ulong_t __user *reg_window;
 537         const compat_ulong_t *k = kbuf;
 538         const compat_ulong_t __user *u = ubuf;
 539         compat_ulong_t reg;
 540
 541         if (target == current)
 542                 flushw_user();
 543
 544         pos /= sizeof(reg);
 545         count /= sizeof(reg);
 546
 547         if (kbuf) {
 548                 for (; count > 0 && pos < 16; count--)
 549                         regs->u_regs[pos++] = *k++;
 550
 551                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 552                 if (target == current) {
 553                         for (; count > 0 && pos < 32; count--) {
 554                                 if (put_user(*k++, &reg_window[pos++]))
 555                                         return -EFAULT;
 556                         }
 557                 } else {
 558                         for (; count > 0 && pos < 32; count--) {
 559                                 if (access_process_vm(target,
 560                                                       (unsigned long)
 561                                                       &reg_window[pos],
 562                                                       (void *) k,
 563                                                       sizeof(*k), 1)
 564                                     != sizeof(*k))
 565                                         return -EFAULT;
 566                                 k++;
 567                                 pos++;
 568                         }
 569                 }
 570         } else {
 571                 for (; count > 0 && pos < 16; count--) {
 572                         if (get_user(reg, u++))
 573                                 return -EFAULT;
 574                         regs->u_regs[pos++] = reg;
 575                 }
 576
 577                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 578                 if (target == current) {
 579                         for (; count > 0 && pos < 32; count--) {
 580                                 if (get_user(reg, u++) ||
 581                                     put_user(reg, &reg_window[pos++]))
 582                                         return -EFAULT;
 583                         }
 584                 } else {
 585                         for (; count > 0 && pos < 32; count--) {
 586                                 if (access_process_vm(target,
 587                                                       (unsigned long)
 588                                                       u,
 589                                                       &reg, sizeof(reg), 0)
 590                                     != sizeof(reg))
 591                                         return -EFAULT;
 592                                 if (access_process_vm(target,
 593                                                       (unsigned long)
 594                                                       &reg_window[pos],
 595                                                       &reg, sizeof(reg), 1)
 596                                     != sizeof(reg))
 597                                         return -EFAULT;
 598                                 pos++;
 599                                 u++;
 600                         }
 601                 }
 602         }
 603         while (count > 0) {
 604                 unsigned long tstate;
 605
 606                 if (kbuf)
 607                         reg = *k++;
 608                 else if (get_user(reg, u++))
 609                         return -EFAULT;
 610
 611                 switch (pos) {
 612                 case 32: /* PSR */
 613                         tstate = regs->tstate;
 614                         tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 615                         tstate |= psr_to_tstate_icc(reg);
 616                         regs->tstate = tstate;
 617                         break;
 618                 case 33: /* PC */
 619                         regs->tpc = reg;
 620                         break;
 621                 case 34: /* NPC */
 622                         regs->tnpc = reg;
 623                         break;
 624                 case 35: /* Y */
 625                         regs->y = reg;
 626                         break;
 627                 case 36: /* WIM */
 628                 case 37: /* TBR */
 629                         break;
 630                 default:
 631                         goto finish;
 632                 }
 633
 634                 pos++;
 635                 count--;
 636         }
 637 finish:
 638         pos *= sizeof(reg);
 639         count *= sizeof(reg);
 640
 641         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 642                                          38 * sizeof(reg), -1);
 643 }
 644
 645 static int fpregs32_get(struct task_struct *target,
 646                         const struct user_regset *regset,
 647                         unsigned int pos, unsigned int count,
 648                         void *kbuf, void __user *ubuf)
 649 {
 650         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 651         compat_ulong_t enabled;
 652         unsigned long fprs;
 653         compat_ulong_t fsr;
 654         int ret = 0;
 655
 656         if (target == current)
 657                 save_and_clear_fpu();
 658
 659         fprs = task_thread_info(target)->fpsaved[0];
 660         if (fprs & FPRS_FEF) {
 661                 fsr = task_thread_info(target)->xfsr[0];
 662                 enabled = 1;
 663         } else {
 664                 fsr = 0;
 665                 enabled = 0;
 666         }
 667
 668         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 669                                   fpregs,
 670                                   0, 32 * sizeof(u32));
 671
 672         if (!ret)
 673                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 674                                                32 * sizeof(u32),
 675                                                33 * sizeof(u32));
 676         if (!ret)
 677                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 678                                           &fsr,
 679                                           33 * sizeof(u32),
 680                                           34 * sizeof(u32));
 681
 682         if (!ret) {
 683                 compat_ulong_t val;
 684
 685                 val = (enabled << 8) | (8 << 16);
 686                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 687                                           &val,
 688                                           34 * sizeof(u32),
 689                                           35 * sizeof(u32));
 690         }
 691
 692         if (!ret)
 693                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 694                                                35 * sizeof(u32), -1);
 695
 696         return ret;
 697 }
 698
 699 static int fpregs32_set(struct task_struct *target,
 700                         const struct user_regset *regset,
 701                         unsigned int pos, unsigned int count,
 702                         const void *kbuf, const void __user *ubuf)
 703 {
 704         unsigned long *fpregs = task_thread_info(target)->fpregs;
 705         unsigned long fprs;
 706         int ret;
 707
 708         if (target == current)
 709                 save_and_clear_fpu();
 710
 711         fprs = task_thread_info(target)->fpsaved[0];
 712
 713         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 714                                  fpregs,
 715                                  0, 32 * sizeof(u32));
 716         if (!ret)
 717                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 718                                           32 * sizeof(u32),
 719                                           33 * sizeof(u32));
 720         if (!ret && count > 0) {
 721                 compat_ulong_t fsr;
 722                 unsigned long val;
 723
 724                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 725                                          &fsr,
 726                                          33 * sizeof(u32),
 727                                          34 * sizeof(u32));
 728                 if (!ret) {
 729                         val = task_thread_info(target)->xfsr[0];
 730                         val &= 0xffffffff00000000UL;
 731                         val |= fsr;
 732                         task_thread_info(target)->xfsr[0] = val;
 733                 }
 734         }
 735
 736         fprs |= (FPRS_FEF | FPRS_DL);
 737         task_thread_info(target)->fpsaved[0] = fprs;
 738
 739         if (!ret)
 740                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 741                                                 34 * sizeof(u32), -1);
 742         return ret;
 743 }
 744
 745 static const struct user_regset sparc32_regsets[] = {
 746         /* Format is:
 747          *      G0 --> G7
 748          *      O0 --> O7
 749          *      L0 --> L7
 750          *      I0 --> I7
 751          *      PSR, PC, nPC, Y, WIM, TBR
 752          */
 753         [REGSET_GENERAL] = {
 754                 .core_note_type = NT_PRSTATUS,
 755                 .n = 38 * sizeof(u32),
 756                 .size = sizeof(u32), .align = sizeof(u32),
 757                 .get = genregs32_get, .set = genregs32_set
 758         },
 759         /* Format is:
 760          *      F0 --> F31
 761          *      empty 32-bit word
 762          *      FSR (32--bit word)
 763          *      FPU QUEUE COUNT (8-bit char)
 764          *      FPU QUEUE ENTRYSIZE (8-bit char)
 765          *      FPU ENABLED (8-bit char)
 766          *      empty 8-bit char
 767          *      FPU QUEUE (64 32-bit ints)
 768          */
 769         [REGSET_FP] = {
 770                 .core_note_type = NT_PRFPREG,
 771                 .n = 99 * sizeof(u32),
 772                 .size = sizeof(u32), .align = sizeof(u32),
 773                 .get = fpregs32_get, .set = fpregs32_set
 774         },
 775 };
 776
 777 static const struct user_regset_view user_sparc32_view = {
 778         .name = "sparc", .e_machine = EM_SPARC,
 779         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 780 };
 781 #endif /* CONFIG_COMPAT */
 782
 783 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 784 {
 785 #ifdef CONFIG_COMPAT
 786         if (test_tsk_thread_flag(task, TIF_32BIT))
 787                 return &user_sparc32_view;
 788 #endif
 789         return &user_sparc64_view;
 790 }
 791
 792 #ifdef CONFIG_COMPAT
 793 struct compat_fps {
 794         unsigned int regs[32];
 795         unsigned int fsr;
 796         unsigned int flags;
 797         unsigned int extra;
 798         unsigned int fpqd;
 799         struct compat_fq {
 800                 unsigned int insnaddr;
 801                 unsigned int insn;
 802         } fpq[16];
 803 };
 804
 805 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 806                         compat_ulong_t caddr, compat_ulong_t cdata)
 807 {
 808         const struct user_regset_view *view = task_user_regset_view(child);
 809         compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
 810         struct pt_regs32 __user *pregs;
 811         struct compat_fps __user *fps;
 812         unsigned long addr2 = caddr2;
 813         unsigned long addr = caddr;
 814         unsigned long data = cdata;
 815         int ret;
 816
 817         pregs = (struct pt_regs32 __user *) addr;
 818         fps = (struct compat_fps __user *) addr;
 819
 820         switch (request) {
 821         case PTRACE_PEEKUSR:
 822                 ret = (addr != 0) ? -EIO : 0;
 823                 break;
 824
 825         case PTRACE_GETREGS:
 826                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 827                                           32 * sizeof(u32),
 828                                           4 * sizeof(u32),
 829                                           &pregs->psr);
 830                 if (!ret)
 831                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 832                                                   1 * sizeof(u32),
 833                                                   15 * sizeof(u32),
 834                                                   &pregs->u_regs[0]);
 835                 break;
 836
 837         case PTRACE_SETREGS:
 838                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 839                                             32 * sizeof(u32),
 840                                             4 * sizeof(u32),
 841                                             &pregs->psr);
 842                 if (!ret)
 843                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 844                                                     1 * sizeof(u32),
 845                                                     15 * sizeof(u32),
 846                                                     &pregs->u_regs[0]);
 847                 break;
 848
 849         case PTRACE_GETFPREGS:
 850                 ret = copy_regset_to_user(child, view, REGSET_FP,
 851                                           0 * sizeof(u32),
 852                                           32 * sizeof(u32),
 853                                           &fps->regs[0]);
 854                 if (!ret)
 855                         ret = copy_regset_to_user(child, view, REGSET_FP,
 856                                                   33 * sizeof(u32),
 857                                                   1 * sizeof(u32),
 858                                                   &fps->fsr);
 859                 if (!ret) {
 860                         if (__put_user(0, &fps->flags) ||
 861                             __put_user(0, &fps->extra) ||
 862                             __put_user(0, &fps->fpqd) ||
 863                             clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
 864                                 ret = -EFAULT;
 865                 }
 866                 break;
 867
 868         case PTRACE_SETFPREGS:
 869                 ret = copy_regset_from_user(child, view, REGSET_FP,
 870                                             0 * sizeof(u32),
 871                                             32 * sizeof(u32),
 872                                             &fps->regs[0]);
 873                 if (!ret)
 874                         ret = copy_regset_from_user(child, view, REGSET_FP,
 875                                                     33 * sizeof(u32),
 876                                                     1 * sizeof(u32),
 877                                                     &fps->fsr);
 878                 break;
 879
 880         case PTRACE_READTEXT:
 881         case PTRACE_READDATA:
 882                 ret = ptrace_readdata(child, addr,
 883                                       (char __user *)addr2, data);
 884                 if (ret == data)
 885                         ret = 0;
 886                 else if (ret >= 0)
 887                         ret = -EIO;
 888                 break;
 889
 890         case PTRACE_WRITETEXT:
 891         case PTRACE_WRITEDATA:
 892                 ret = ptrace_writedata(child, (char __user *) addr2,
 893                                        addr, data);
 894                 if (ret == data)
 895                         ret = 0;
 896                 else if (ret >= 0)
 897                         ret = -EIO;
 898                 break;
 899
 900         default:
 901                 ret = compat_ptrace_request(child, request, addr, data);
 902                 break;
 903         }
 904
 905         return ret;
 906 }
 907 #endif /* CONFIG_COMPAT */
 908
 909 struct fps {
 910         unsigned int regs[64];
 911         unsigned long fsr;
 912 };
 913
 914 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 915 {
 916         const struct user_regset_view *view = task_user_regset_view(child);
 917         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
 918         struct pt_regs __user *pregs;
 919         struct fps __user *fps;
 920         int ret;
 921
 922         pregs = (struct pt_regs __user *) (unsigned long) addr;
 923         fps = (struct fps __user *) (unsigned long) addr;
 924
 925         switch (request) {
 926         case PTRACE_PEEKUSR:
 927                 ret = (addr != 0) ? -EIO : 0;
 928                 break;
 929
 930         case PTRACE_GETREGS64:
 931                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 932                                           1 * sizeof(u64),
 933                                           15 * sizeof(u64),
 934                                           &pregs->u_regs[0]);
 935                 if (!ret) {
 936                         /* XXX doesn't handle 'y' register correctly XXX */
 937                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 938                                                   32 * sizeof(u64),
 939                                                   4 * sizeof(u64),
 940                                                   &pregs->tstate);
 941                 }
 942                 break;
 943
 944         case PTRACE_SETREGS64:
 945                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 946                                             1 * sizeof(u64),
 947                                             15 * sizeof(u64),
 948                                             &pregs->u_regs[0]);
 949                 if (!ret) {
 950                         /* XXX doesn't handle 'y' register correctly XXX */
 951                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 952                                                     32 * sizeof(u64),
 953                                                     4 * sizeof(u64),
 954                                                     &pregs->tstate);
 955                 }
 956                 break;
 957
 958         case PTRACE_GETFPREGS64:
 959                 ret = copy_regset_to_user(child, view, REGSET_FP,
 960                                           0 * sizeof(u64),
 961                                           33 * sizeof(u64),
 962                                           fps);
 963                 break;
 964
 965         case PTRACE_SETFPREGS64:
 966                 ret = copy_regset_to_user(child, view, REGSET_FP,
 967                                           0 * sizeof(u64),
 968                                           33 * sizeof(u64),
 969                                           fps);
 970                 break;
 971
 972         case PTRACE_READTEXT:
 973         case PTRACE_READDATA:
 974                 ret = ptrace_readdata(child, addr,
 975                                       (char __user *)addr2, data);
 976                 if (ret == data)
 977                         ret = 0;
 978                 else if (ret >= 0)
 979                         ret = -EIO;
 980                 break;
 981
 982         case PTRACE_WRITETEXT:
 983         case PTRACE_WRITEDATA:
 984                 ret = ptrace_writedata(child, (char __user *) addr2,
 985                                        addr, data);
 986                 if (ret == data)
 987                         ret = 0;
 988                 else if (ret >= 0)
 989                         ret = -EIO;
 990                 break;
 991
 992         default:
 993                 ret = ptrace_request(child, request, addr, data);
 994                 break;
 995         }
 996
 997         return ret;
 998 }
 999
1000 asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
1001 {
1002         /* do the secure computing check first */
1003         secure_computing(regs->u_regs[UREG_G1]);
1004
1005         if (unlikely(current->audit_context) && syscall_exit_p) {
1006                 unsigned long tstate = regs->tstate;
1007                 int result = AUDITSC_SUCCESS;
1008
1009                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
1010                         result = AUDITSC_FAILURE;
1011
1012                 audit_syscall_exit(result, regs->u_regs[UREG_I0]);
1013         }
1014
1015         if (!(current->ptrace & PT_PTRACED))
1016                 goto out;
1017
1018         if (!test_thread_flag(TIF_SYSCALL_TRACE))
1019                 goto out;
1020
1021         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
1022                                  ? 0x80 : 0));
1023
1024         /*
1025          * this isn't the same as continuing with a signal, but it will do
1026          * for normal use.  strace only continues with a signal if the
1027          * stopping signal is not SIGTRAP.  -brl
1028          */
1029         if (current->exit_code) {
1030                 send_sig(current->exit_code, current, 1);
1031                 current->exit_code = 0;
1032         }
1033
1034 out:
1035         if (unlikely(current->audit_context) && !syscall_exit_p)
1036                 audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
1037                                      AUDIT_ARCH_SPARC :
1038                                      AUDIT_ARCH_SPARC64),
1039                                     regs->u_regs[UREG_G1],
1040                                     regs->u_regs[UREG_I0],
1041                                     regs->u_regs[UREG_I1],
1042                                     regs->u_regs[UREG_I2],
1043                                     regs->u_regs[UREG_I3]);
1044 }