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/tracehook.h>
  27 #include <linux/compat.h>
  28 #include <linux/elf.h>
  29
  30 #include <asm/asi.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/system.h>
  33 #include <asm/uaccess.h>
  34 #include <asm/psrcompat.h>
  35 #include <asm/visasm.h>
  36 #include <asm/spitfire.h>
  37 #include <asm/page.h>
  38 #include <asm/cpudata.h>
  39 #include <asm/cacheflush.h>
  40
  41 #include "entry.h"
  42
  43 /* #define ALLOW_INIT_TRACING */
  44
  45 /*
  46  * Called by kernel/ptrace.c when detaching..
  47  *
  48  * Make sure single step bits etc are not set.
  49  */
  50 void ptrace_disable(struct task_struct *child)
  51 {
  52         /* nothing to do */
  53 }
  54
  55 /* To get the necessary page struct, access_process_vm() first calls
  56  * get_user_pages().  This has done a flush_dcache_page() on the
  57  * accessed page.  Then our caller (copy_{to,from}_user_page()) did
  58  * to memcpy to read/write the data from that page.
  59  *
  60  * Now, the only thing we have to do is:
  61  * 1) flush the D-cache if it's possible than an illegal alias
  62  *    has been created
  63  * 2) flush the I-cache if this is pre-cheetah and we did a write
  64  */
  65 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
  66                          unsigned long uaddr, void *kaddr,
  67                          unsigned long len, int write)
  68 {
  69         BUG_ON(len > PAGE_SIZE);
  70
  71         if (tlb_type == hypervisor)
  72                 return;
  73
  74         preempt_disable();
  75
  76 #ifdef DCACHE_ALIASING_POSSIBLE
  77         /* If bit 13 of the kernel address we used to access the
  78          * user page is the same as the virtual address that page
  79          * is mapped to in the user's address space, we can skip the
  80          * D-cache flush.
  81          */
  82         if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
  83                 unsigned long start = __pa(kaddr);
  84                 unsigned long end = start + len;
  85                 unsigned long dcache_line_size;
  86
  87                 dcache_line_size = local_cpu_data().dcache_line_size;
  88
  89                 if (tlb_type == spitfire) {
  90                         for (; start < end; start += dcache_line_size)
  91                                 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
  92                 } else {
  93                         start &= ~(dcache_line_size - 1);
  94                         for (; start < end; start += dcache_line_size)
  95                                 __asm__ __volatile__(
  96                                         "stxa %%g0, [%0] %1\n\t"
  97                                         "membar #Sync"
  98                                         : /* no outputs */
  99                                         : "r" (start),
 100                                         "i" (ASI_DCACHE_INVALIDATE));
 101                 }
 102         }
 103 #endif
 104         if (write && tlb_type == spitfire) {
 105                 unsigned long start = (unsigned long) kaddr;
 106                 unsigned long end = start + len;
 107                 unsigned long icache_line_size;
 108
 109                 icache_line_size = local_cpu_data().icache_line_size;
 110
 111                 for (; start < end; start += icache_line_size)
 112                         flushi(start);
 113         }
 114
 115         preempt_enable();
 116 }
 117
 118 static int get_from_target(struct task_struct *target, unsigned long uaddr,
 119                            void *kbuf, int len)
 120 {
 121         if (target == current) {
 122                 if (copy_from_user(kbuf, (void __user *) uaddr, len))
 123                         return -EFAULT;
 124         } else {
 125                 int len2 = access_process_vm(target, uaddr, kbuf, len, 0);
 126                 if (len2 != len)
 127                         return -EFAULT;
 128         }
 129         return 0;
 130 }
 131
 132 static int set_to_target(struct task_struct *target, unsigned long uaddr,
 133                          void *kbuf, int len)
 134 {
 135         if (target == current) {
 136                 if (copy_to_user((void __user *) uaddr, kbuf, len))
 137                         return -EFAULT;
 138         } else {
 139                 int len2 = access_process_vm(target, uaddr, kbuf, len, 1);
 140                 if (len2 != len)
 141                         return -EFAULT;
 142         }
 143         return 0;
 144 }
 145
 146 static int regwindow64_get(struct task_struct *target,
 147                            const struct pt_regs *regs,
 148                            struct reg_window *wbuf)
 149 {
 150         unsigned long rw_addr = regs->u_regs[UREG_I6];
 151
 152         if (test_tsk_thread_flag(current, TIF_32BIT)) {
 153                 struct reg_window32 win32;
 154                 int i;
 155
 156                 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
 157                         return -EFAULT;
 158                 for (i = 0; i < 8; i++)
 159                         wbuf->locals[i] = win32.locals[i];
 160                 for (i = 0; i < 8; i++)
 161                         wbuf->ins[i] = win32.ins[i];
 162         } else {
 163                 rw_addr += STACK_BIAS;
 164                 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 165                         return -EFAULT;
 166         }
 167
 168         return 0;
 169 }
 170
 171 static int regwindow64_set(struct task_struct *target,
 172                            const struct pt_regs *regs,
 173                            struct reg_window *wbuf)
 174 {
 175         unsigned long rw_addr = regs->u_regs[UREG_I6];
 176
 177         if (test_tsk_thread_flag(current, TIF_32BIT)) {
 178                 struct reg_window32 win32;
 179                 int i;
 180
 181                 for (i = 0; i < 8; i++)
 182                         win32.locals[i] = wbuf->locals[i];
 183                 for (i = 0; i < 8; i++)
 184                         win32.ins[i] = wbuf->ins[i];
 185
 186                 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
 187                         return -EFAULT;
 188         } else {
 189                 rw_addr += STACK_BIAS;
 190                 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 191                         return -EFAULT;
 192         }
 193
 194         return 0;
 195 }
 196
 197 enum sparc_regset {
 198         REGSET_GENERAL,
 199         REGSET_FP,
 200 };
 201
 202 static int genregs64_get(struct task_struct *target,
 203                          const struct user_regset *regset,
 204                          unsigned int pos, unsigned int count,
 205                          void *kbuf, void __user *ubuf)
 206 {
 207         const struct pt_regs *regs = task_pt_regs(target);
 208         int ret;
 209
 210         if (target == current)
 211                 flushw_user();
 212
 213         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 214                                   regs->u_regs,
 215                                   0, 16 * sizeof(u64));
 216         if (!ret && count && pos < (32 * sizeof(u64))) {
 217                 struct reg_window window;
 218
 219                 if (regwindow64_get(target, regs, &window))
 220                         return -EFAULT;
 221                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 222                                           &window,
 223                                           16 * sizeof(u64),
 224                                           32 * sizeof(u64));
 225         }
 226
 227         if (!ret) {
 228                 /* TSTATE, TPC, TNPC */
 229                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 230                                           &regs->tstate,
 231                                           32 * sizeof(u64),
 232                                           35 * sizeof(u64));
 233         }
 234
 235         if (!ret) {
 236                 unsigned long y = regs->y;
 237
 238                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 239                                           &y,
 240                                           35 * sizeof(u64),
 241                                           36 * sizeof(u64));
 242         }
 243
 244         if (!ret) {
 245                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 246                                                36 * sizeof(u64), -1);
 247
 248         }
 249         return ret;
 250 }
 251
 252 static int genregs64_set(struct task_struct *target,
 253                          const struct user_regset *regset,
 254                          unsigned int pos, unsigned int count,
 255                          const void *kbuf, const void __user *ubuf)
 256 {
 257         struct pt_regs *regs = task_pt_regs(target);
 258         int ret;
 259
 260         if (target == current)
 261                 flushw_user();
 262
 263         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 264                                  regs->u_regs,
 265                                  0, 16 * sizeof(u64));
 266         if (!ret && count && pos < (32 * sizeof(u64))) {
 267                 struct reg_window window;
 268
 269                 if (regwindow64_get(target, regs, &window))
 270                         return -EFAULT;
 271
 272                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 273                                          &window,
 274                                          16 * sizeof(u64),
 275                                          32 * sizeof(u64));
 276
 277                 if (!ret &&
 278                     regwindow64_set(target, regs, &window))
 279                         return -EFAULT;
 280         }
 281
 282         if (!ret && count > 0) {
 283                 unsigned long tstate;
 284
 285                 /* TSTATE */
 286                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 287                                          &tstate,
 288                                          32 * sizeof(u64),
 289                                          33 * sizeof(u64));
 290                 if (!ret) {
 291                         /* Only the condition codes and the "in syscall"
 292                          * state can be modified in the %tstate register.
 293                          */
 294                         tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 295                         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 296                         regs->tstate |= tstate;
 297                 }
 298         }
 299
 300         if (!ret) {
 301                 /* TPC, TNPC */
 302                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 303                                          &regs->tpc,
 304                                          33 * sizeof(u64),
 305                                          35 * sizeof(u64));
 306         }
 307
 308         if (!ret) {
 309                 unsigned long y;
 310
 311                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 312                                          &y,
 313                                          35 * sizeof(u64),
 314                                          36 * sizeof(u64));
 315                 if (!ret)
 316                         regs->y = y;
 317         }
 318
 319         if (!ret)
 320                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 321                                                 36 * sizeof(u64), -1);
 322
 323         return ret;
 324 }
 325
 326 static int fpregs64_get(struct task_struct *target,
 327                         const struct user_regset *regset,
 328                         unsigned int pos, unsigned int count,
 329                         void *kbuf, void __user *ubuf)
 330 {
 331         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 332         unsigned long fprs, fsr, gsr;
 333         int ret;
 334
 335         if (target == current)
 336                 save_and_clear_fpu();
 337
 338         fprs = task_thread_info(target)->fpsaved[0];
 339
 340         if (fprs & FPRS_DL)
 341                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 342                                           fpregs,
 343                                           0, 16 * sizeof(u64));
 344         else
 345                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 346                                                0,
 347                                                16 * sizeof(u64));
 348
 349         if (!ret) {
 350                 if (fprs & FPRS_DU)
 351                         ret = user_regset_copyout(&pos, &count,
 352                                                   &kbuf, &ubuf,
 353                                                   fpregs + 16,
 354                                                   16 * sizeof(u64),
 355                                                   32 * sizeof(u64));
 356                 else
 357                         ret = user_regset_copyout_zero(&pos, &count,
 358                                                        &kbuf, &ubuf,
 359                                                        16 * sizeof(u64),
 360                                                        32 * sizeof(u64));
 361         }
 362
 363         if (fprs & FPRS_FEF) {
 364                 fsr = task_thread_info(target)->xfsr[0];
 365                 gsr = task_thread_info(target)->gsr[0];
 366         } else {
 367                 fsr = gsr = 0;
 368         }
 369
 370         if (!ret)
 371                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 372                                           &fsr,
 373                                           32 * sizeof(u64),
 374                                           33 * sizeof(u64));
 375         if (!ret)
 376                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 377                                           &gsr,
 378                                           33 * sizeof(u64),
 379                                           34 * sizeof(u64));
 380         if (!ret)
 381                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 382                                           &fprs,
 383                                           34 * sizeof(u64),
 384                                           35 * sizeof(u64));
 385
 386         if (!ret)
 387                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 388                                                35 * sizeof(u64), -1);
 389
 390         return ret;
 391 }
 392
 393 static int fpregs64_set(struct task_struct *target,
 394                         const struct user_regset *regset,
 395                         unsigned int pos, unsigned int count,
 396                         const void *kbuf, const void __user *ubuf)
 397 {
 398         unsigned long *fpregs = task_thread_info(target)->fpregs;
 399         unsigned long fprs;
 400         int ret;
 401
 402         if (target == current)
 403                 save_and_clear_fpu();
 404
 405         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 406                                  fpregs,
 407                                  0, 32 * sizeof(u64));
 408         if (!ret)
 409                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 410                                          task_thread_info(target)->xfsr,
 411                                          32 * sizeof(u64),
 412                                          33 * sizeof(u64));
 413         if (!ret)
 414                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 415                                          task_thread_info(target)->gsr,
 416                                          33 * sizeof(u64),
 417                                          34 * sizeof(u64));
 418
 419         fprs = task_thread_info(target)->fpsaved[0];
 420         if (!ret && count > 0) {
 421                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 422                                          &fprs,
 423                                          34 * sizeof(u64),
 424                                          35 * sizeof(u64));
 425         }
 426
 427         fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 428         task_thread_info(target)->fpsaved[0] = fprs;
 429
 430         if (!ret)
 431                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 432                                                 35 * sizeof(u64), -1);
 433         return ret;
 434 }
 435
 436 static const struct user_regset sparc64_regsets[] = {
 437         /* Format is:
 438          *      G0 --> G7
 439          *      O0 --> O7
 440          *      L0 --> L7
 441          *      I0 --> I7
 442          *      TSTATE, TPC, TNPC, Y
 443          */
 444         [REGSET_GENERAL] = {
 445                 .core_note_type = NT_PRSTATUS,
 446                 .n = 36,
 447                 .size = sizeof(u64), .align = sizeof(u64),
 448                 .get = genregs64_get, .set = genregs64_set
 449         },
 450         /* Format is:
 451          *      F0 --> F63
 452          *      FSR
 453          *      GSR
 454          *      FPRS
 455          */
 456         [REGSET_FP] = {
 457                 .core_note_type = NT_PRFPREG,
 458                 .n = 35,
 459                 .size = sizeof(u64), .align = sizeof(u64),
 460                 .get = fpregs64_get, .set = fpregs64_set
 461         },
 462 };
 463
 464 static const struct user_regset_view user_sparc64_view = {
 465         .name = "sparc64", .e_machine = EM_SPARCV9,
 466         .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
 467 };
 468
 469 #ifdef CONFIG_COMPAT
 470 static int genregs32_get(struct task_struct *target,
 471                          const struct user_regset *regset,
 472                          unsigned int pos, unsigned int count,
 473                          void *kbuf, void __user *ubuf)
 474 {
 475         const struct pt_regs *regs = task_pt_regs(target);
 476         compat_ulong_t __user *reg_window;
 477         compat_ulong_t *k = kbuf;
 478         compat_ulong_t __user *u = ubuf;
 479         compat_ulong_t reg;
 480
 481         if (target == current)
 482                 flushw_user();
 483
 484         pos /= sizeof(reg);
 485         count /= sizeof(reg);
 486
 487         if (kbuf) {
 488                 for (; count > 0 && pos < 16; count--)
 489                         *k++ = regs->u_regs[pos++];
 490
 491                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 492                 if (target == current) {
 493                         for (; count > 0 && pos < 32; count--) {
 494                                 if (get_user(*k++, &reg_window[pos++]))
 495                                         return -EFAULT;
 496                         }
 497                 } else {
 498                         for (; count > 0 && pos < 32; count--) {
 499                                 if (access_process_vm(target,
 500                                                       (unsigned long)
 501                                                       &reg_window[pos],
 502                                                       k, sizeof(*k), 0)
 503                                     != sizeof(*k))
 504                                         return -EFAULT;
 505                                 k++;
 506                                 pos++;
 507                         }
 508                 }
 509         } else {
 510                 for (; count > 0 && pos < 16; count--) {
 511                         if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
 512                                 return -EFAULT;
 513                 }
 514
 515                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 516                 if (target == current) {
 517                         for (; count > 0 && pos < 32; count--) {
 518                                 if (get_user(reg, &reg_window[pos++]) ||
 519                                     put_user(reg, u++))
 520                                         return -EFAULT;
 521                         }
 522                 } else {
 523                         for (; count > 0 && pos < 32; count--) {
 524                                 if (access_process_vm(target,
 525                                                       (unsigned long)
 526                                                       &reg_window[pos],
 527                                                       &reg, sizeof(reg), 0)
 528                                     != sizeof(reg))
 529                                         return -EFAULT;
 530                                 if (access_process_vm(target,
 531                                                       (unsigned long) u,
 532                                                       &reg, sizeof(reg), 1)
 533                                     != sizeof(reg))
 534                                         return -EFAULT;
 535                                 pos++;
 536                                 u++;
 537                         }
 538                 }
 539         }
 540         while (count > 0) {
 541                 switch (pos) {
 542                 case 32: /* PSR */
 543                         reg = tstate_to_psr(regs->tstate);
 544                         break;
 545                 case 33: /* PC */
 546                         reg = regs->tpc;
 547                         break;
 548                 case 34: /* NPC */
 549                         reg = regs->tnpc;
 550                         break;
 551                 case 35: /* Y */
 552                         reg = regs->y;
 553                         break;
 554                 case 36: /* WIM */
 555                 case 37: /* TBR */
 556                         reg = 0;
 557                         break;
 558                 default:
 559                         goto finish;
 560                 }
 561
 562                 if (kbuf)
 563                         *k++ = reg;
 564                 else if (put_user(reg, u++))
 565                         return -EFAULT;
 566                 pos++;
 567                 count--;
 568         }
 569 finish:
 570         pos *= sizeof(reg);
 571         count *= sizeof(reg);
 572
 573         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 574                                         38 * sizeof(reg), -1);
 575 }
 576
 577 static int genregs32_set(struct task_struct *target,
 578                          const struct user_regset *regset,
 579                          unsigned int pos, unsigned int count,
 580                          const void *kbuf, const void __user *ubuf)
 581 {
 582         struct pt_regs *regs = task_pt_regs(target);
 583         compat_ulong_t __user *reg_window;
 584         const compat_ulong_t *k = kbuf;
 585         const compat_ulong_t __user *u = ubuf;
 586         compat_ulong_t reg;
 587
 588         if (target == current)
 589                 flushw_user();
 590
 591         pos /= sizeof(reg);
 592         count /= sizeof(reg);
 593
 594         if (kbuf) {
 595                 for (; count > 0 && pos < 16; count--)
 596                         regs->u_regs[pos++] = *k++;
 597
 598                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 599                 if (target == current) {
 600                         for (; count > 0 && pos < 32; count--) {
 601                                 if (put_user(*k++, &reg_window[pos++]))
 602                                         return -EFAULT;
 603                         }
 604                 } else {
 605                         for (; count > 0 && pos < 32; count--) {
 606                                 if (access_process_vm(target,
 607                                                       (unsigned long)
 608                                                       &reg_window[pos],
 609                                                       (void *) k,
 610                                                       sizeof(*k), 1)
 611                                     != sizeof(*k))
 612                                         return -EFAULT;
 613                                 k++;
 614                                 pos++;
 615                         }
 616                 }
 617         } else {
 618                 for (; count > 0 && pos < 16; count--) {
 619                         if (get_user(reg, u++))
 620                                 return -EFAULT;
 621                         regs->u_regs[pos++] = reg;
 622                 }
 623
 624                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 625                 if (target == current) {
 626                         for (; count > 0 && pos < 32; count--) {
 627                                 if (get_user(reg, u++) ||
 628                                     put_user(reg, &reg_window[pos++]))
 629                                         return -EFAULT;
 630                         }
 631                 } else {
 632                         for (; count > 0 && pos < 32; count--) {
 633                                 if (access_process_vm(target,
 634                                                       (unsigned long)
 635                                                       u,
 636                                                       &reg, sizeof(reg), 0)
 637                                     != sizeof(reg))
 638                                         return -EFAULT;
 639                                 if (access_process_vm(target,
 640                                                       (unsigned long)
 641                                                       &reg_window[pos],
 642                                                       &reg, sizeof(reg), 1)
 643                                     != sizeof(reg))
 644                                         return -EFAULT;
 645                                 pos++;
 646                                 u++;
 647                         }
 648                 }
 649         }
 650         while (count > 0) {
 651                 unsigned long tstate;
 652
 653                 if (kbuf)
 654                         reg = *k++;
 655                 else if (get_user(reg, u++))
 656                         return -EFAULT;
 657
 658                 switch (pos) {
 659                 case 32: /* PSR */
 660                         tstate = regs->tstate;
 661                         tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 662                         tstate |= psr_to_tstate_icc(reg);
 663                         if (reg & PSR_SYSCALL)
 664                                 tstate |= TSTATE_SYSCALL;
 665                         regs->tstate = tstate;
 666                         break;
 667                 case 33: /* PC */
 668                         regs->tpc = reg;
 669                         break;
 670                 case 34: /* NPC */
 671                         regs->tnpc = reg;
 672                         break;
 673                 case 35: /* Y */
 674                         regs->y = reg;
 675                         break;
 676                 case 36: /* WIM */
 677                 case 37: /* TBR */
 678                         break;
 679                 default:
 680                         goto finish;
 681                 }
 682
 683                 pos++;
 684                 count--;
 685         }
 686 finish:
 687         pos *= sizeof(reg);
 688         count *= sizeof(reg);
 689
 690         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 691                                          38 * sizeof(reg), -1);
 692 }
 693
 694 static int fpregs32_get(struct task_struct *target,
 695                         const struct user_regset *regset,
 696                         unsigned int pos, unsigned int count,
 697                         void *kbuf, void __user *ubuf)
 698 {
 699         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 700         compat_ulong_t enabled;
 701         unsigned long fprs;
 702         compat_ulong_t fsr;
 703         int ret = 0;
 704
 705         if (target == current)
 706                 save_and_clear_fpu();
 707
 708         fprs = task_thread_info(target)->fpsaved[0];
 709         if (fprs & FPRS_FEF) {
 710                 fsr = task_thread_info(target)->xfsr[0];
 711                 enabled = 1;
 712         } else {
 713                 fsr = 0;
 714                 enabled = 0;
 715         }
 716
 717         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 718                                   fpregs,
 719                                   0, 32 * sizeof(u32));
 720
 721         if (!ret)
 722                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 723                                                32 * sizeof(u32),
 724                                                33 * sizeof(u32));
 725         if (!ret)
 726                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 727                                           &fsr,
 728                                           33 * sizeof(u32),
 729                                           34 * sizeof(u32));
 730
 731         if (!ret) {
 732                 compat_ulong_t val;
 733
 734                 val = (enabled << 8) | (8 << 16);
 735                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 736                                           &val,
 737                                           34 * sizeof(u32),
 738                                           35 * sizeof(u32));
 739         }
 740
 741         if (!ret)
 742                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 743                                                35 * sizeof(u32), -1);
 744
 745         return ret;
 746 }
 747
 748 static int fpregs32_set(struct task_struct *target,
 749                         const struct user_regset *regset,
 750                         unsigned int pos, unsigned int count,
 751                         const void *kbuf, const void __user *ubuf)
 752 {
 753         unsigned long *fpregs = task_thread_info(target)->fpregs;
 754         unsigned long fprs;
 755         int ret;
 756
 757         if (target == current)
 758                 save_and_clear_fpu();
 759
 760         fprs = task_thread_info(target)->fpsaved[0];
 761
 762         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 763                                  fpregs,
 764                                  0, 32 * sizeof(u32));
 765         if (!ret)
 766                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 767                                           32 * sizeof(u32),
 768                                           33 * sizeof(u32));
 769         if (!ret && count > 0) {
 770                 compat_ulong_t fsr;
 771                 unsigned long val;
 772
 773                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 774                                          &fsr,
 775                                          33 * sizeof(u32),
 776                                          34 * sizeof(u32));
 777                 if (!ret) {
 778                         val = task_thread_info(target)->xfsr[0];
 779                         val &= 0xffffffff00000000UL;
 780                         val |= fsr;
 781                         task_thread_info(target)->xfsr[0] = val;
 782                 }
 783         }
 784
 785         fprs |= (FPRS_FEF | FPRS_DL);
 786         task_thread_info(target)->fpsaved[0] = fprs;
 787
 788         if (!ret)
 789                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 790                                                 34 * sizeof(u32), -1);
 791         return ret;
 792 }
 793
 794 static const struct user_regset sparc32_regsets[] = {
 795         /* Format is:
 796          *      G0 --> G7
 797          *      O0 --> O7
 798          *      L0 --> L7
 799          *      I0 --> I7
 800          *      PSR, PC, nPC, Y, WIM, TBR
 801          */
 802         [REGSET_GENERAL] = {
 803                 .core_note_type = NT_PRSTATUS,
 804                 .n = 38,
 805                 .size = sizeof(u32), .align = sizeof(u32),
 806                 .get = genregs32_get, .set = genregs32_set
 807         },
 808         /* Format is:
 809          *      F0 --> F31
 810          *      empty 32-bit word
 811          *      FSR (32--bit word)
 812          *      FPU QUEUE COUNT (8-bit char)
 813          *      FPU QUEUE ENTRYSIZE (8-bit char)
 814          *      FPU ENABLED (8-bit char)
 815          *      empty 8-bit char
 816          *      FPU QUEUE (64 32-bit ints)
 817          */
 818         [REGSET_FP] = {
 819                 .core_note_type = NT_PRFPREG,
 820                 .n = 99,
 821                 .size = sizeof(u32), .align = sizeof(u32),
 822                 .get = fpregs32_get, .set = fpregs32_set
 823         },
 824 };
 825
 826 static const struct user_regset_view user_sparc32_view = {
 827         .name = "sparc", .e_machine = EM_SPARC,
 828         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 829 };
 830 #endif /* CONFIG_COMPAT */
 831
 832 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 833 {
 834 #ifdef CONFIG_COMPAT
 835         if (test_tsk_thread_flag(task, TIF_32BIT))
 836                 return &user_sparc32_view;
 837 #endif
 838         return &user_sparc64_view;
 839 }
 840
 841 #ifdef CONFIG_COMPAT
 842 struct compat_fps {
 843         unsigned int regs[32];
 844         unsigned int fsr;
 845         unsigned int flags;
 846         unsigned int extra;
 847         unsigned int fpqd;
 848         struct compat_fq {
 849                 unsigned int insnaddr;
 850                 unsigned int insn;
 851         } fpq[16];
 852 };
 853
 854 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 855                         compat_ulong_t caddr, compat_ulong_t cdata)
 856 {
 857         const struct user_regset_view *view = task_user_regset_view(current);
 858         compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
 859         struct pt_regs32 __user *pregs;
 860         struct compat_fps __user *fps;
 861         unsigned long addr2 = caddr2;
 862         unsigned long addr = caddr;
 863         unsigned long data = cdata;
 864         int ret;
 865
 866         pregs = (struct pt_regs32 __user *) addr;
 867         fps = (struct compat_fps __user *) addr;
 868
 869         switch (request) {
 870         case PTRACE_PEEKUSR:
 871                 ret = (addr != 0) ? -EIO : 0;
 872                 break;
 873
 874         case PTRACE_GETREGS:
 875                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 876                                           32 * sizeof(u32),
 877                                           4 * sizeof(u32),
 878                                           &pregs->psr);
 879                 if (!ret)
 880                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 881                                                   1 * sizeof(u32),
 882                                                   15 * sizeof(u32),
 883                                                   &pregs->u_regs[0]);
 884                 break;
 885
 886         case PTRACE_SETREGS:
 887                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 888                                             32 * sizeof(u32),
 889                                             4 * sizeof(u32),
 890                                             &pregs->psr);
 891                 if (!ret)
 892                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 893                                                     1 * sizeof(u32),
 894                                                     15 * sizeof(u32),
 895                                                     &pregs->u_regs[0]);
 896                 break;
 897
 898         case PTRACE_GETFPREGS:
 899                 ret = copy_regset_to_user(child, view, REGSET_FP,
 900                                           0 * sizeof(u32),
 901                                           32 * sizeof(u32),
 902                                           &fps->regs[0]);
 903                 if (!ret)
 904                         ret = copy_regset_to_user(child, view, REGSET_FP,
 905                                                   33 * sizeof(u32),
 906                                                   1 * sizeof(u32),
 907                                                   &fps->fsr);
 908                 if (!ret) {
 909                         if (__put_user(0, &fps->flags) ||
 910                             __put_user(0, &fps->extra) ||
 911                             __put_user(0, &fps->fpqd) ||
 912                             clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
 913                                 ret = -EFAULT;
 914                 }
 915                 break;
 916
 917         case PTRACE_SETFPREGS:
 918                 ret = copy_regset_from_user(child, view, REGSET_FP,
 919                                             0 * sizeof(u32),
 920                                             32 * sizeof(u32),
 921                                             &fps->regs[0]);
 922                 if (!ret)
 923                         ret = copy_regset_from_user(child, view, REGSET_FP,
 924                                                     33 * sizeof(u32),
 925                                                     1 * sizeof(u32),
 926                                                     &fps->fsr);
 927                 break;
 928
 929         case PTRACE_READTEXT:
 930         case PTRACE_READDATA:
 931                 ret = ptrace_readdata(child, addr,
 932                                       (char __user *)addr2, data);
 933                 if (ret == data)
 934                         ret = 0;
 935                 else if (ret >= 0)
 936                         ret = -EIO;
 937                 break;
 938
 939         case PTRACE_WRITETEXT:
 940         case PTRACE_WRITEDATA:
 941                 ret = ptrace_writedata(child, (char __user *) addr2,
 942                                        addr, data);
 943                 if (ret == data)
 944                         ret = 0;
 945                 else if (ret >= 0)
 946                         ret = -EIO;
 947                 break;
 948
 949         default:
 950                 if (request == PTRACE_SPARC_DETACH)
 951                         request = PTRACE_DETACH;
 952                 ret = compat_ptrace_request(child, request, addr, data);
 953                 break;
 954         }
 955
 956         return ret;
 957 }
 958 #endif /* CONFIG_COMPAT */
 959
 960 struct fps {
 961         unsigned int regs[64];
 962         unsigned long fsr;
 963 };
 964
 965 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 966 {
 967         const struct user_regset_view *view = task_user_regset_view(current);
 968         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
 969         struct pt_regs __user *pregs;
 970         struct fps __user *fps;
 971         int ret;
 972
 973         pregs = (struct pt_regs __user *) (unsigned long) addr;
 974         fps = (struct fps __user *) (unsigned long) addr;
 975
 976         switch (request) {
 977         case PTRACE_PEEKUSR:
 978                 ret = (addr != 0) ? -EIO : 0;
 979                 break;
 980
 981         case PTRACE_GETREGS64:
 982                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 983                                           1 * sizeof(u64),
 984                                           15 * sizeof(u64),
 985                                           &pregs->u_regs[0]);
 986                 if (!ret) {
 987                         /* XXX doesn't handle 'y' register correctly XXX */
 988                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 989                                                   32 * sizeof(u64),
 990                                                   4 * sizeof(u64),
 991                                                   &pregs->tstate);
 992                 }
 993                 break;
 994
 995         case PTRACE_SETREGS64:
 996                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 997                                             1 * sizeof(u64),
 998                                             15 * sizeof(u64),
 999                                             &pregs->u_regs[0]);
1000                 if (!ret) {
1001                         /* XXX doesn't handle 'y' register correctly XXX */
1002                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1003                                                     32 * sizeof(u64),
1004                                                     4 * sizeof(u64),
1005                                                     &pregs->tstate);
1006                 }
1007                 break;
1008
1009         case PTRACE_GETFPREGS64:
1010                 ret = copy_regset_to_user(child, view, REGSET_FP,
1011                                           0 * sizeof(u64),
1012                                           33 * sizeof(u64),
1013                                           fps);
1014                 break;
1015
1016         case PTRACE_SETFPREGS64:
1017                 ret = copy_regset_from_user(child, view, REGSET_FP,
1018                                           0 * sizeof(u64),
1019                                           33 * sizeof(u64),
1020                                           fps);
1021                 break;
1022
1023         case PTRACE_READTEXT:
1024         case PTRACE_READDATA:
1025                 ret = ptrace_readdata(child, addr,
1026                                       (char __user *)addr2, data);
1027                 if (ret == data)
1028                         ret = 0;
1029                 else if (ret >= 0)
1030                         ret = -EIO;
1031                 break;
1032
1033         case PTRACE_WRITETEXT:
1034         case PTRACE_WRITEDATA:
1035                 ret = ptrace_writedata(child, (char __user *) addr2,
1036                                        addr, data);
1037                 if (ret == data)
1038                         ret = 0;
1039                 else if (ret >= 0)
1040                         ret = -EIO;
1041                 break;
1042
1043         default:
1044                 if (request == PTRACE_SPARC_DETACH)
1045                         request = PTRACE_DETACH;
1046                 ret = ptrace_request(child, request, addr, data);
1047                 break;
1048         }
1049
1050         return ret;
1051 }
1052
1053 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1054 {
1055         int ret = 0;
1056
1057         /* do the secure computing check first */
1058         secure_computing(regs->u_regs[UREG_G1]);
1059
1060         if (test_thread_flag(TIF_SYSCALL_TRACE))
1061                 ret = tracehook_report_syscall_entry(regs);
1062
1063         if (unlikely(current->audit_context) && !ret)
1064                 audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
1065                                      AUDIT_ARCH_SPARC :
1066                                      AUDIT_ARCH_SPARC64),
1067                                     regs->u_regs[UREG_G1],
1068                                     regs->u_regs[UREG_I0],
1069                                     regs->u_regs[UREG_I1],
1070                                     regs->u_regs[UREG_I2],
1071                                     regs->u_regs[UREG_I3]);
1072
1073         return ret;
1074 }
1075
1076 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1077 {
1078         if (unlikely(current->audit_context)) {
1079                 unsigned long tstate = regs->tstate;
1080                 int result = AUDITSC_SUCCESS;
1081
1082                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
1083                         result = AUDITSC_FAILURE;
1084
1085                 audit_syscall_exit(result, regs->u_regs[UREG_I0]);
1086         }
1087
1088         if (test_thread_flag(TIF_SYSCALL_TRACE))
1089                 tracehook_report_syscall_exit(regs, 0);
1090 }