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 static int get_from_target(struct task_struct *target, unsigned long uaddr,
 118                            void *kbuf, int len)
 119 {
 120         if (target == current) {
 121                 if (copy_from_user(kbuf, (void __user *) uaddr, len))
 122                         return -EFAULT;
 123         } else {
 124                 int len2 = access_process_vm(target, uaddr, kbuf, len, 0);
 125                 if (len2 != len)
 126                         return -EFAULT;
 127         }
 128         return 0;
 129 }
 130
 131 static int set_to_target(struct task_struct *target, unsigned long uaddr,
 132                          void *kbuf, int len)
 133 {
 134         if (target == current) {
 135                 if (copy_to_user((void __user *) uaddr, kbuf, len))
 136                         return -EFAULT;
 137         } else {
 138                 int len2 = access_process_vm(target, uaddr, kbuf, len, 1);
 139                 if (len2 != len)
 140                         return -EFAULT;
 141         }
 142         return 0;
 143 }
 144
 145 static int regwindow64_get(struct task_struct *target,
 146                            const struct pt_regs *regs,
 147                            struct reg_window *wbuf)
 148 {
 149         unsigned long rw_addr = regs->u_regs[UREG_I6];
 150
 151         if (test_tsk_thread_flag(current, TIF_32BIT)) {
 152                 struct reg_window32 win32;
 153                 int i;
 154
 155                 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
 156                         return -EFAULT;
 157                 for (i = 0; i < 8; i++)
 158                         wbuf->locals[i] = win32.locals[i];
 159                 for (i = 0; i < 8; i++)
 160                         wbuf->ins[i] = win32.ins[i];
 161         } else {
 162                 rw_addr += STACK_BIAS;
 163                 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 164                         return -EFAULT;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static int regwindow64_set(struct task_struct *target,
 171                            const struct pt_regs *regs,
 172                            struct reg_window *wbuf)
 173 {
 174         unsigned long rw_addr = regs->u_regs[UREG_I6];
 175
 176         if (test_tsk_thread_flag(current, TIF_32BIT)) {
 177                 struct reg_window32 win32;
 178                 int i;
 179
 180                 for (i = 0; i < 8; i++)
 181                         win32.locals[i] = wbuf->locals[i];
 182                 for (i = 0; i < 8; i++)
 183                         win32.ins[i] = wbuf->ins[i];
 184
 185                 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
 186                         return -EFAULT;
 187         } else {
 188                 rw_addr += STACK_BIAS;
 189                 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 190                         return -EFAULT;
 191         }
 192
 193         return 0;
 194 }
 195
 196 enum sparc_regset {
 197         REGSET_GENERAL,
 198         REGSET_FP,
 199 };
 200
 201 static int genregs64_get(struct task_struct *target,
 202                          const struct user_regset *regset,
 203                          unsigned int pos, unsigned int count,
 204                          void *kbuf, void __user *ubuf)
 205 {
 206         const struct pt_regs *regs = task_pt_regs(target);
 207         int ret;
 208
 209         if (target == current)
 210                 flushw_user();
 211
 212         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 213                                   regs->u_regs,
 214                                   0, 16 * sizeof(u64));
 215         if (!ret && count && pos < (32 * sizeof(u64))) {
 216                 struct reg_window window;
 217
 218                 if (regwindow64_get(target, regs, &window))
 219                         return -EFAULT;
 220                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 221                                           &window,
 222                                           16 * sizeof(u64),
 223                                           32 * sizeof(u64));
 224         }
 225
 226         if (!ret) {
 227                 /* TSTATE, TPC, TNPC */
 228                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 229                                           &regs->tstate,
 230                                           32 * sizeof(u64),
 231                                           35 * sizeof(u64));
 232         }
 233
 234         if (!ret) {
 235                 unsigned long y = regs->y;
 236
 237                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 238                                           &y,
 239                                           35 * sizeof(u64),
 240                                           36 * sizeof(u64));
 241         }
 242
 243         if (!ret) {
 244                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 245                                                36 * sizeof(u64), -1);
 246
 247         }
 248         return ret;
 249 }
 250
 251 static int genregs64_set(struct task_struct *target,
 252                          const struct user_regset *regset,
 253                          unsigned int pos, unsigned int count,
 254                          const void *kbuf, const void __user *ubuf)
 255 {
 256         struct pt_regs *regs = task_pt_regs(target);
 257         int ret;
 258
 259         if (target == current)
 260                 flushw_user();
 261
 262         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 263                                  regs->u_regs,
 264                                  0, 16 * sizeof(u64));
 265         if (!ret && count && pos < (32 * sizeof(u64))) {
 266                 struct reg_window window;
 267
 268                 if (regwindow64_get(target, regs, &window))
 269                         return -EFAULT;
 270
 271                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 272                                          &window,
 273                                          16 * sizeof(u64),
 274                                          32 * sizeof(u64));
 275
 276                 if (!ret &&
 277                     regwindow64_set(target, regs, &window))
 278                         return -EFAULT;
 279         }
 280
 281         if (!ret && count > 0) {
 282                 unsigned long tstate;
 283
 284                 /* TSTATE */
 285                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 286                                          &tstate,
 287                                          32 * sizeof(u64),
 288                                          33 * sizeof(u64));
 289                 if (!ret) {
 290                         /* Only the condition codes can be modified
 291                          * in the %tstate register.
 292                          */
 293                         tstate &= (TSTATE_ICC | TSTATE_XCC);
 294                         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 295                         regs->tstate |= tstate;
 296                 }
 297         }
 298
 299         if (!ret) {
 300                 /* TPC, TNPC */
 301                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 302                                          &regs->tpc,
 303                                          33 * sizeof(u64),
 304                                          35 * sizeof(u64));
 305         }
 306
 307         if (!ret) {
 308                 unsigned long y;
 309
 310                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 311                                          &y,
 312                                          35 * sizeof(u64),
 313                                          36 * sizeof(u64));
 314                 if (!ret)
 315                         regs->y = y;
 316         }
 317
 318         if (!ret)
 319                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 320                                                 36 * sizeof(u64), -1);
 321
 322         return ret;
 323 }
 324
 325 static int fpregs64_get(struct task_struct *target,
 326                         const struct user_regset *regset,
 327                         unsigned int pos, unsigned int count,
 328                         void *kbuf, void __user *ubuf)
 329 {
 330         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 331         unsigned long fprs, fsr, gsr;
 332         int ret;
 333
 334         if (target == current)
 335                 save_and_clear_fpu();
 336
 337         fprs = task_thread_info(target)->fpsaved[0];
 338
 339         if (fprs & FPRS_DL)
 340                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 341                                           fpregs,
 342                                           0, 16 * sizeof(u64));
 343         else
 344                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 345                                                0,
 346                                                16 * sizeof(u64));
 347
 348         if (!ret) {
 349                 if (fprs & FPRS_DU)
 350                         ret = user_regset_copyout(&pos, &count,
 351                                                   &kbuf, &ubuf,
 352                                                   fpregs + 16,
 353                                                   16 * sizeof(u64),
 354                                                   32 * sizeof(u64));
 355                 else
 356                         ret = user_regset_copyout_zero(&pos, &count,
 357                                                        &kbuf, &ubuf,
 358                                                        16 * sizeof(u64),
 359                                                        32 * sizeof(u64));
 360         }
 361
 362         if (fprs & FPRS_FEF) {
 363                 fsr = task_thread_info(target)->xfsr[0];
 364                 gsr = task_thread_info(target)->gsr[0];
 365         } else {
 366                 fsr = gsr = 0;
 367         }
 368
 369         if (!ret)
 370                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 371                                           &fsr,
 372                                           32 * sizeof(u64),
 373                                           33 * sizeof(u64));
 374         if (!ret)
 375                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 376                                           &gsr,
 377                                           33 * sizeof(u64),
 378                                           34 * sizeof(u64));
 379         if (!ret)
 380                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 381                                           &fprs,
 382                                           34 * sizeof(u64),
 383                                           35 * sizeof(u64));
 384
 385         if (!ret)
 386                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 387                                                35 * sizeof(u64), -1);
 388
 389         return ret;
 390 }
 391
 392 static int fpregs64_set(struct task_struct *target,
 393                         const struct user_regset *regset,
 394                         unsigned int pos, unsigned int count,
 395                         const void *kbuf, const void __user *ubuf)
 396 {
 397         unsigned long *fpregs = task_thread_info(target)->fpregs;
 398         unsigned long fprs;
 399         int ret;
 400
 401         if (target == current)
 402                 save_and_clear_fpu();
 403
 404         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 405                                  fpregs,
 406                                  0, 32 * sizeof(u64));
 407         if (!ret)
 408                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 409                                          task_thread_info(target)->xfsr,
 410                                          32 * sizeof(u64),
 411                                          33 * sizeof(u64));
 412         if (!ret)
 413                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 414                                          task_thread_info(target)->gsr,
 415                                          33 * sizeof(u64),
 416                                          34 * sizeof(u64));
 417
 418         fprs = task_thread_info(target)->fpsaved[0];
 419         if (!ret && count > 0) {
 420                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 421                                          &fprs,
 422                                          34 * sizeof(u64),
 423                                          35 * sizeof(u64));
 424         }
 425
 426         fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 427         task_thread_info(target)->fpsaved[0] = fprs;
 428
 429         if (!ret)
 430                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 431                                                 35 * sizeof(u64), -1);
 432         return ret;
 433 }
 434
 435 static const struct user_regset sparc64_regsets[] = {
 436         /* Format is:
 437          *      G0 --> G7
 438          *      O0 --> O7
 439          *      L0 --> L7
 440          *      I0 --> I7
 441          *      TSTATE, TPC, TNPC, Y
 442          */
 443         [REGSET_GENERAL] = {
 444                 .core_note_type = NT_PRSTATUS,
 445                 .n = 36 * sizeof(u64),
 446                 .size = sizeof(u64), .align = sizeof(u64),
 447                 .get = genregs64_get, .set = genregs64_set
 448         },
 449         /* Format is:
 450          *      F0 --> F63
 451          *      FSR
 452          *      GSR
 453          *      FPRS
 454          */
 455         [REGSET_FP] = {
 456                 .core_note_type = NT_PRFPREG,
 457                 .n = 35 * sizeof(u64),
 458                 .size = sizeof(u64), .align = sizeof(u64),
 459                 .get = fpregs64_get, .set = fpregs64_set
 460         },
 461 };
 462
 463 static const struct user_regset_view user_sparc64_view = {
 464         .name = "sparc64", .e_machine = EM_SPARCV9,
 465         .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
 466 };
 467
 468 #ifdef CONFIG_COMPAT
 469 static int genregs32_get(struct task_struct *target,
 470                          const struct user_regset *regset,
 471                          unsigned int pos, unsigned int count,
 472                          void *kbuf, void __user *ubuf)
 473 {
 474         const struct pt_regs *regs = task_pt_regs(target);
 475         compat_ulong_t __user *reg_window;
 476         compat_ulong_t *k = kbuf;
 477         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                         *k++ = regs->u_regs[pos++];
 489
 490                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 491                 if (target == current) {
 492                         for (; count > 0 && pos < 32; count--) {
 493                                 if (get_user(*k++, &reg_window[pos++]))
 494                                         return -EFAULT;
 495                         }
 496                 } else {
 497                         for (; count > 0 && pos < 32; count--) {
 498                                 if (access_process_vm(target,
 499                                                       (unsigned long)
 500                                                       &reg_window[pos],
 501                                                       k, sizeof(*k), 0)
 502                                     != sizeof(*k))
 503                                         return -EFAULT;
 504                                 k++;
 505                                 pos++;
 506                         }
 507                 }
 508         } else {
 509                 for (; count > 0 && pos < 16; count--) {
 510                         if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
 511                                 return -EFAULT;
 512                 }
 513
 514                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 515                 if (target == current) {
 516                         for (; count > 0 && pos < 32; count--) {
 517                                 if (get_user(reg, &reg_window[pos++]) ||
 518                                     put_user(reg, u++))
 519                                         return -EFAULT;
 520                         }
 521                 } else {
 522                         for (; count > 0 && pos < 32; count--) {
 523                                 if (access_process_vm(target,
 524                                                       (unsigned long)
 525                                                       &reg_window[pos],
 526                                                       &reg, sizeof(reg), 0)
 527                                     != sizeof(reg))
 528                                         return -EFAULT;
 529                                 if (access_process_vm(target,
 530                                                       (unsigned long) u,
 531                                                       &reg, sizeof(reg), 1)
 532                                     != sizeof(reg))
 533                                         return -EFAULT;
 534                                 pos++;
 535                                 u++;
 536                         }
 537                 }
 538         }
 539         while (count > 0) {
 540                 switch (pos) {
 541                 case 32: /* PSR */
 542                         reg = tstate_to_psr(regs->tstate);
 543                         break;
 544                 case 33: /* PC */
 545                         reg = regs->tpc;
 546                         break;
 547                 case 34: /* NPC */
 548                         reg = regs->tnpc;
 549                         break;
 550                 case 35: /* Y */
 551                         reg = regs->y;
 552                         break;
 553                 case 36: /* WIM */
 554                 case 37: /* TBR */
 555                         reg = 0;
 556                         break;
 557                 default:
 558                         goto finish;
 559                 }
 560
 561                 if (kbuf)
 562                         *k++ = reg;
 563                 else if (put_user(reg, u++))
 564                         return -EFAULT;
 565                 pos++;
 566                 count--;
 567         }
 568 finish:
 569         pos *= sizeof(reg);
 570         count *= sizeof(reg);
 571
 572         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 573                                         38 * sizeof(reg), -1);
 574 }
 575
 576 static int genregs32_set(struct task_struct *target,
 577                          const struct user_regset *regset,
 578                          unsigned int pos, unsigned int count,
 579                          const void *kbuf, const void __user *ubuf)
 580 {
 581         struct pt_regs *regs = task_pt_regs(target);
 582         compat_ulong_t __user *reg_window;
 583         const compat_ulong_t *k = kbuf;
 584         const compat_ulong_t __user *u = ubuf;
 585         compat_ulong_t reg;
 586
 587         if (target == current)
 588                 flushw_user();
 589
 590         pos /= sizeof(reg);
 591         count /= sizeof(reg);
 592
 593         if (kbuf) {
 594                 for (; count > 0 && pos < 16; count--)
 595                         regs->u_regs[pos++] = *k++;
 596
 597                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 598                 if (target == current) {
 599                         for (; count > 0 && pos < 32; count--) {
 600                                 if (put_user(*k++, &reg_window[pos++]))
 601                                         return -EFAULT;
 602                         }
 603                 } else {
 604                         for (; count > 0 && pos < 32; count--) {
 605                                 if (access_process_vm(target,
 606                                                       (unsigned long)
 607                                                       &reg_window[pos],
 608                                                       (void *) k,
 609                                                       sizeof(*k), 1)
 610                                     != sizeof(*k))
 611                                         return -EFAULT;
 612                                 k++;
 613                                 pos++;
 614                         }
 615                 }
 616         } else {
 617                 for (; count > 0 && pos < 16; count--) {
 618                         if (get_user(reg, u++))
 619                                 return -EFAULT;
 620                         regs->u_regs[pos++] = reg;
 621                 }
 622
 623                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 624                 if (target == current) {
 625                         for (; count > 0 && pos < 32; count--) {
 626                                 if (get_user(reg, u++) ||
 627                                     put_user(reg, &reg_window[pos++]))
 628                                         return -EFAULT;
 629                         }
 630                 } else {
 631                         for (; count > 0 && pos < 32; count--) {
 632                                 if (access_process_vm(target,
 633                                                       (unsigned long)
 634                                                       u,
 635                                                       &reg, sizeof(reg), 0)
 636                                     != sizeof(reg))
 637                                         return -EFAULT;
 638                                 if (access_process_vm(target,
 639                                                       (unsigned long)
 640                                                       &reg_window[pos],
 641                                                       &reg, sizeof(reg), 1)
 642                                     != sizeof(reg))
 643                                         return -EFAULT;
 644                                 pos++;
 645                                 u++;
 646                         }
 647                 }
 648         }
 649         while (count > 0) {
 650                 unsigned long tstate;
 651
 652                 if (kbuf)
 653                         reg = *k++;
 654                 else if (get_user(reg, u++))
 655                         return -EFAULT;
 656
 657                 switch (pos) {
 658                 case 32: /* PSR */
 659                         tstate = regs->tstate;
 660                         tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 661                         tstate |= psr_to_tstate_icc(reg);
 662                         regs->tstate = tstate;
 663                         break;
 664                 case 33: /* PC */
 665                         regs->tpc = reg;
 666                         break;
 667                 case 34: /* NPC */
 668                         regs->tnpc = reg;
 669                         break;
 670                 case 35: /* Y */
 671                         regs->y = reg;
 672                         break;
 673                 case 36: /* WIM */
 674                 case 37: /* TBR */
 675                         break;
 676                 default:
 677                         goto finish;
 678                 }
 679
 680                 pos++;
 681                 count--;
 682         }
 683 finish:
 684         pos *= sizeof(reg);
 685         count *= sizeof(reg);
 686
 687         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 688                                          38 * sizeof(reg), -1);
 689 }
 690
 691 static int fpregs32_get(struct task_struct *target,
 692                         const struct user_regset *regset,
 693                         unsigned int pos, unsigned int count,
 694                         void *kbuf, void __user *ubuf)
 695 {
 696         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 697         compat_ulong_t enabled;
 698         unsigned long fprs;
 699         compat_ulong_t fsr;
 700         int ret = 0;
 701
 702         if (target == current)
 703                 save_and_clear_fpu();
 704
 705         fprs = task_thread_info(target)->fpsaved[0];
 706         if (fprs & FPRS_FEF) {
 707                 fsr = task_thread_info(target)->xfsr[0];
 708                 enabled = 1;
 709         } else {
 710                 fsr = 0;
 711                 enabled = 0;
 712         }
 713
 714         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 715                                   fpregs,
 716                                   0, 32 * sizeof(u32));
 717
 718         if (!ret)
 719                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 720                                                32 * sizeof(u32),
 721                                                33 * sizeof(u32));
 722         if (!ret)
 723                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 724                                           &fsr,
 725                                           33 * sizeof(u32),
 726                                           34 * sizeof(u32));
 727
 728         if (!ret) {
 729                 compat_ulong_t val;
 730
 731                 val = (enabled << 8) | (8 << 16);
 732                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 733                                           &val,
 734                                           34 * sizeof(u32),
 735                                           35 * sizeof(u32));
 736         }
 737
 738         if (!ret)
 739                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 740                                                35 * sizeof(u32), -1);
 741
 742         return ret;
 743 }
 744
 745 static int fpregs32_set(struct task_struct *target,
 746                         const struct user_regset *regset,
 747                         unsigned int pos, unsigned int count,
 748                         const void *kbuf, const void __user *ubuf)
 749 {
 750         unsigned long *fpregs = task_thread_info(target)->fpregs;
 751         unsigned long fprs;
 752         int ret;
 753
 754         if (target == current)
 755                 save_and_clear_fpu();
 756
 757         fprs = task_thread_info(target)->fpsaved[0];
 758
 759         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 760                                  fpregs,
 761                                  0, 32 * sizeof(u32));
 762         if (!ret)
 763                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 764                                           32 * sizeof(u32),
 765                                           33 * sizeof(u32));
 766         if (!ret && count > 0) {
 767                 compat_ulong_t fsr;
 768                 unsigned long val;
 769
 770                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 771                                          &fsr,
 772                                          33 * sizeof(u32),
 773                                          34 * sizeof(u32));
 774                 if (!ret) {
 775                         val = task_thread_info(target)->xfsr[0];
 776                         val &= 0xffffffff00000000UL;
 777                         val |= fsr;
 778                         task_thread_info(target)->xfsr[0] = val;
 779                 }
 780         }
 781
 782         fprs |= (FPRS_FEF | FPRS_DL);
 783         task_thread_info(target)->fpsaved[0] = fprs;
 784
 785         if (!ret)
 786                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 787                                                 34 * sizeof(u32), -1);
 788         return ret;
 789 }
 790
 791 static const struct user_regset sparc32_regsets[] = {
 792         /* Format is:
 793          *      G0 --> G7
 794          *      O0 --> O7
 795          *      L0 --> L7
 796          *      I0 --> I7
 797          *      PSR, PC, nPC, Y, WIM, TBR
 798          */
 799         [REGSET_GENERAL] = {
 800                 .core_note_type = NT_PRSTATUS,
 801                 .n = 38 * sizeof(u32),
 802                 .size = sizeof(u32), .align = sizeof(u32),
 803                 .get = genregs32_get, .set = genregs32_set
 804         },
 805         /* Format is:
 806          *      F0 --> F31
 807          *      empty 32-bit word
 808          *      FSR (32--bit word)
 809          *      FPU QUEUE COUNT (8-bit char)
 810          *      FPU QUEUE ENTRYSIZE (8-bit char)
 811          *      FPU ENABLED (8-bit char)
 812          *      empty 8-bit char
 813          *      FPU QUEUE (64 32-bit ints)
 814          */
 815         [REGSET_FP] = {
 816                 .core_note_type = NT_PRFPREG,
 817                 .n = 99 * sizeof(u32),
 818                 .size = sizeof(u32), .align = sizeof(u32),
 819                 .get = fpregs32_get, .set = fpregs32_set
 820         },
 821 };
 822
 823 static const struct user_regset_view user_sparc32_view = {
 824         .name = "sparc", .e_machine = EM_SPARC,
 825         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 826 };
 827 #endif /* CONFIG_COMPAT */
 828
 829 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 830 {
 831 #ifdef CONFIG_COMPAT
 832         if (test_tsk_thread_flag(task, TIF_32BIT))
 833                 return &user_sparc32_view;
 834 #endif
 835         return &user_sparc64_view;
 836 }
 837
 838 #ifdef CONFIG_COMPAT
 839 struct compat_fps {
 840         unsigned int regs[32];
 841         unsigned int fsr;
 842         unsigned int flags;
 843         unsigned int extra;
 844         unsigned int fpqd;
 845         struct compat_fq {
 846                 unsigned int insnaddr;
 847                 unsigned int insn;
 848         } fpq[16];
 849 };
 850
 851 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 852                         compat_ulong_t caddr, compat_ulong_t cdata)
 853 {
 854         const struct user_regset_view *view = task_user_regset_view(current);
 855         compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
 856         struct pt_regs32 __user *pregs;
 857         struct compat_fps __user *fps;
 858         unsigned long addr2 = caddr2;
 859         unsigned long addr = caddr;
 860         unsigned long data = cdata;
 861         int ret;
 862
 863         pregs = (struct pt_regs32 __user *) addr;
 864         fps = (struct compat_fps __user *) addr;
 865
 866         switch (request) {
 867         case PTRACE_PEEKUSR:
 868                 ret = (addr != 0) ? -EIO : 0;
 869                 break;
 870
 871         case PTRACE_GETREGS:
 872                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 873                                           32 * sizeof(u32),
 874                                           4 * sizeof(u32),
 875                                           &pregs->psr);
 876                 if (!ret)
 877                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 878                                                   1 * sizeof(u32),
 879                                                   15 * sizeof(u32),
 880                                                   &pregs->u_regs[0]);
 881                 break;
 882
 883         case PTRACE_SETREGS:
 884                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 885                                             32 * sizeof(u32),
 886                                             4 * sizeof(u32),
 887                                             &pregs->psr);
 888                 if (!ret)
 889                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 890                                                     1 * sizeof(u32),
 891                                                     15 * sizeof(u32),
 892                                                     &pregs->u_regs[0]);
 893                 break;
 894
 895         case PTRACE_GETFPREGS:
 896                 ret = copy_regset_to_user(child, view, REGSET_FP,
 897                                           0 * sizeof(u32),
 898                                           32 * sizeof(u32),
 899                                           &fps->regs[0]);
 900                 if (!ret)
 901                         ret = copy_regset_to_user(child, view, REGSET_FP,
 902                                                   33 * sizeof(u32),
 903                                                   1 * sizeof(u32),
 904                                                   &fps->fsr);
 905                 if (!ret) {
 906                         if (__put_user(0, &fps->flags) ||
 907                             __put_user(0, &fps->extra) ||
 908                             __put_user(0, &fps->fpqd) ||
 909                             clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
 910                                 ret = -EFAULT;
 911                 }
 912                 break;
 913
 914         case PTRACE_SETFPREGS:
 915                 ret = copy_regset_from_user(child, view, REGSET_FP,
 916                                             0 * sizeof(u32),
 917                                             32 * sizeof(u32),
 918                                             &fps->regs[0]);
 919                 if (!ret)
 920                         ret = copy_regset_from_user(child, view, REGSET_FP,
 921                                                     33 * sizeof(u32),
 922                                                     1 * sizeof(u32),
 923                                                     &fps->fsr);
 924                 break;
 925
 926         case PTRACE_READTEXT:
 927         case PTRACE_READDATA:
 928                 ret = ptrace_readdata(child, addr,
 929                                       (char __user *)addr2, data);
 930                 if (ret == data)
 931                         ret = 0;
 932                 else if (ret >= 0)
 933                         ret = -EIO;
 934                 break;
 935
 936         case PTRACE_WRITETEXT:
 937         case PTRACE_WRITEDATA:
 938                 ret = ptrace_writedata(child, (char __user *) addr2,
 939                                        addr, data);
 940                 if (ret == data)
 941                         ret = 0;
 942                 else if (ret >= 0)
 943                         ret = -EIO;
 944                 break;
 945
 946         default:
 947                 ret = compat_ptrace_request(child, request, addr, data);
 948                 break;
 949         }
 950
 951         return ret;
 952 }
 953 #endif /* CONFIG_COMPAT */
 954
 955 struct fps {
 956         unsigned int regs[64];
 957         unsigned long fsr;
 958 };
 959
 960 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 961 {
 962         const struct user_regset_view *view = task_user_regset_view(current);
 963         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
 964         struct pt_regs __user *pregs;
 965         struct fps __user *fps;
 966         int ret;
 967
 968         pregs = (struct pt_regs __user *) (unsigned long) addr;
 969         fps = (struct fps __user *) (unsigned long) addr;
 970
 971         switch (request) {
 972         case PTRACE_PEEKUSR:
 973                 ret = (addr != 0) ? -EIO : 0;
 974                 break;
 975
 976         case PTRACE_GETREGS64:
 977                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 978                                           1 * sizeof(u64),
 979                                           15 * sizeof(u64),
 980                                           &pregs->u_regs[0]);
 981                 if (!ret) {
 982                         /* XXX doesn't handle 'y' register correctly XXX */
 983                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 984                                                   32 * sizeof(u64),
 985                                                   4 * sizeof(u64),
 986                                                   &pregs->tstate);
 987                 }
 988                 break;
 989
 990         case PTRACE_SETREGS64:
 991                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 992                                             1 * sizeof(u64),
 993                                             15 * sizeof(u64),
 994                                             &pregs->u_regs[0]);
 995                 if (!ret) {
 996                         /* XXX doesn't handle 'y' register correctly XXX */
 997                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 998                                                     32 * sizeof(u64),
 999                                                     4 * sizeof(u64),
1000                                                     &pregs->tstate);
1001                 }
1002                 break;
1003
1004         case PTRACE_GETFPREGS64:
1005                 ret = copy_regset_to_user(child, view, REGSET_FP,
1006                                           0 * sizeof(u64),
1007                                           33 * sizeof(u64),
1008                                           fps);
1009                 break;
1010
1011         case PTRACE_SETFPREGS64:
1012                 ret = copy_regset_to_user(child, view, REGSET_FP,
1013                                           0 * sizeof(u64),
1014                                           33 * sizeof(u64),
1015                                           fps);
1016                 break;
1017
1018         case PTRACE_READTEXT:
1019         case PTRACE_READDATA:
1020                 ret = ptrace_readdata(child, addr,
1021                                       (char __user *)addr2, data);
1022                 if (ret == data)
1023                         ret = 0;
1024                 else if (ret >= 0)
1025                         ret = -EIO;
1026                 break;
1027
1028         case PTRACE_WRITETEXT:
1029         case PTRACE_WRITEDATA:
1030                 ret = ptrace_writedata(child, (char __user *) addr2,
1031                                        addr, data);
1032                 if (ret == data)
1033                         ret = 0;
1034                 else if (ret >= 0)
1035                         ret = -EIO;
1036                 break;
1037
1038         default:
1039                 ret = ptrace_request(child, request, addr, data);
1040                 break;
1041         }
1042
1043         return ret;
1044 }
1045
1046 asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
1047 {
1048         /* do the secure computing check first */
1049         secure_computing(regs->u_regs[UREG_G1]);
1050
1051         if (unlikely(current->audit_context) && syscall_exit_p) {
1052                 unsigned long tstate = regs->tstate;
1053                 int result = AUDITSC_SUCCESS;
1054
1055                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
1056                         result = AUDITSC_FAILURE;
1057
1058                 audit_syscall_exit(result, regs->u_regs[UREG_I0]);
1059         }
1060
1061         if (!(current->ptrace & PT_PTRACED))
1062                 goto out;
1063
1064         if (!test_thread_flag(TIF_SYSCALL_TRACE))
1065                 goto out;
1066
1067         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
1068                                  ? 0x80 : 0));
1069
1070         /*
1071          * this isn't the same as continuing with a signal, but it will do
1072          * for normal use.  strace only continues with a signal if the
1073          * stopping signal is not SIGTRAP.  -brl
1074          */
1075         if (current->exit_code) {
1076                 send_sig(current->exit_code, current, 1);
1077                 current->exit_code = 0;
1078         }
1079
1080 out:
1081         if (unlikely(current->audit_context) && !syscall_exit_p)
1082                 audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
1083                                      AUDIT_ARCH_SPARC :
1084                                      AUDIT_ARCH_SPARC64),
1085                                     regs->u_regs[UREG_G1],
1086                                     regs->u_regs[UREG_I0],
1087                                     regs->u_regs[UREG_I1],
1088                                     regs->u_regs[UREG_I2],
1089                                     regs->u_regs[UREG_I3]);
1090 }