arch/sparc/kernel/ptrace_64.c

   1 /* ptrace.c: Sparc process tracing support.
   2  *
   3  * Copyright (C) 1996, 2008 David S. Miller ([email protected])
   4  * Copyright (C) 1997 Jakub Jelinek ([email protected])
   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/export.h>
  18 #include <linux/ptrace.h>
  19 #include <linux/user.h>
  20 #include <linux/smp.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 <trace/syscall.h>
  28 #include <linux/compat.h>
  29 #include <linux/elf.h>
  30 #include <linux/context_tracking.h>
  31
  32 #include <asm/asi.h>
  33 #include <asm/pgtable.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/psrcompat.h>
  36 #include <asm/visasm.h>
  37 #include <asm/spitfire.h>
  38 #include <asm/page.h>
  39 #include <asm/cpudata.h>
  40 #include <asm/cacheflush.h>
  41
  42 #define CREATE_TRACE_POINTS
  43 #include <trace/events/syscalls.h>
  44
  45 #include "entry.h"
  46
  47 /* #define ALLOW_INIT_TRACING */
  48
  49 /*
  50  * Called by kernel/ptrace.c when detaching..
  51  *
  52  * Make sure single step bits etc are not set.
  53  */
  54 void ptrace_disable(struct task_struct *child)
  55 {
  56         /* nothing to do */
  57 }
  58
  59 /* To get the necessary page struct, access_process_vm() first calls
  60  * get_user_pages().  This has done a flush_dcache_page() on the
  61  * accessed page.  Then our caller (copy_{to,from}_user_page()) did
  62  * to memcpy to read/write the data from that page.
  63  *
  64  * Now, the only thing we have to do is:
  65  * 1) flush the D-cache if it's possible than an illegal alias
  66  *    has been created
  67  * 2) flush the I-cache if this is pre-cheetah and we did a write
  68  */
  69 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
  70                          unsigned long uaddr, void *kaddr,
  71                          unsigned long len, int write)
  72 {
  73         BUG_ON(len > PAGE_SIZE);
  74
  75         if (tlb_type == hypervisor)
  76                 return;
  77
  78         preempt_disable();
  79
  80 #ifdef DCACHE_ALIASING_POSSIBLE
  81         /* If bit 13 of the kernel address we used to access the
  82          * user page is the same as the virtual address that page
  83          * is mapped to in the user's address space, we can skip the
  84          * D-cache flush.
  85          */
  86         if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
  87                 unsigned long start = __pa(kaddr);
  88                 unsigned long end = start + len;
  89                 unsigned long dcache_line_size;
  90
  91                 dcache_line_size = local_cpu_data().dcache_line_size;
  92
  93                 if (tlb_type == spitfire) {
  94                         for (; start < end; start += dcache_line_size)
  95                                 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
  96                 } else {
  97                         start &= ~(dcache_line_size - 1);
  98                         for (; start < end; start += dcache_line_size)
  99                                 __asm__ __volatile__(
 100                                         "stxa %%g0, [%0] %1\n\t"
 101                                         "membar #Sync"
 102                                         : /* no outputs */
 103                                         : "r" (start),
 104                                         "i" (ASI_DCACHE_INVALIDATE));
 105                 }
 106         }
 107 #endif
 108         if (write && tlb_type == spitfire) {
 109                 unsigned long start = (unsigned long) kaddr;
 110                 unsigned long end = start + len;
 111                 unsigned long icache_line_size;
 112
 113                 icache_line_size = local_cpu_data().icache_line_size;
 114
 115                 for (; start < end; start += icache_line_size)
 116                         flushi(start);
 117         }
 118
 119         preempt_enable();
 120 }
 121 EXPORT_SYMBOL_GPL(flush_ptrace_access);
 122
 123 static int get_from_target(struct task_struct *target, unsigned long uaddr,
 124                            void *kbuf, int len)
 125 {
 126         if (target == current) {
 127                 if (copy_from_user(kbuf, (void __user *) uaddr, len))
 128                         return -EFAULT;
 129         } else {
 130                 int len2 = access_process_vm(target, uaddr, kbuf, len, 0);
 131                 if (len2 != len)
 132                         return -EFAULT;
 133         }
 134         return 0;
 135 }
 136
 137 static int set_to_target(struct task_struct *target, unsigned long uaddr,
 138                          void *kbuf, int len)
 139 {
 140         if (target == current) {
 141                 if (copy_to_user((void __user *) uaddr, kbuf, len))
 142                         return -EFAULT;
 143         } else {
 144                 int len2 = access_process_vm(target, uaddr, kbuf, len, 1);
 145                 if (len2 != len)
 146                         return -EFAULT;
 147         }
 148         return 0;
 149 }
 150
 151 static int regwindow64_get(struct task_struct *target,
 152                            const struct pt_regs *regs,
 153                            struct reg_window *wbuf)
 154 {
 155         unsigned long rw_addr = regs->u_regs[UREG_I6];
 156
 157         if (!test_thread_64bit_stack(rw_addr)) {
 158                 struct reg_window32 win32;
 159                 int i;
 160
 161                 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
 162                         return -EFAULT;
 163                 for (i = 0; i < 8; i++)
 164                         wbuf->locals[i] = win32.locals[i];
 165                 for (i = 0; i < 8; i++)
 166                         wbuf->ins[i] = win32.ins[i];
 167         } else {
 168                 rw_addr += STACK_BIAS;
 169                 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 170                         return -EFAULT;
 171         }
 172
 173         return 0;
 174 }
 175
 176 static int regwindow64_set(struct task_struct *target,
 177                            const struct pt_regs *regs,
 178                            struct reg_window *wbuf)
 179 {
 180         unsigned long rw_addr = regs->u_regs[UREG_I6];
 181
 182         if (!test_thread_64bit_stack(rw_addr)) {
 183                 struct reg_window32 win32;
 184                 int i;
 185
 186                 for (i = 0; i < 8; i++)
 187                         win32.locals[i] = wbuf->locals[i];
 188                 for (i = 0; i < 8; i++)
 189                         win32.ins[i] = wbuf->ins[i];
 190
 191                 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
 192                         return -EFAULT;
 193         } else {
 194                 rw_addr += STACK_BIAS;
 195                 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 196                         return -EFAULT;
 197         }
 198
 199         return 0;
 200 }
 201
 202 enum sparc_regset {
 203         REGSET_GENERAL,
 204         REGSET_FP,
 205 };
 206
 207 static int genregs64_get(struct task_struct *target,
 208                          const struct user_regset *regset,
 209                          unsigned int pos, unsigned int count,
 210                          void *kbuf, void __user *ubuf)
 211 {
 212         const struct pt_regs *regs = task_pt_regs(target);
 213         int ret;
 214
 215         if (target == current)
 216                 flushw_user();
 217
 218         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 219                                   regs->u_regs,
 220                                   0, 16 * sizeof(u64));
 221         if (!ret && count && pos < (32 * sizeof(u64))) {
 222                 struct reg_window window;
 223
 224                 if (regwindow64_get(target, regs, &window))
 225                         return -EFAULT;
 226                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 227                                           &window,
 228                                           16 * sizeof(u64),
 229                                           32 * sizeof(u64));
 230         }
 231
 232         if (!ret) {
 233                 /* TSTATE, TPC, TNPC */
 234                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 235                                           &regs->tstate,
 236                                           32 * sizeof(u64),
 237                                           35 * sizeof(u64));
 238         }
 239
 240         if (!ret) {
 241                 unsigned long y = regs->y;
 242
 243                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 244                                           &y,
 245                                           35 * sizeof(u64),
 246                                           36 * sizeof(u64));
 247         }
 248
 249         if (!ret) {
 250                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 251                                                36 * sizeof(u64), -1);
 252
 253         }
 254         return ret;
 255 }
 256
 257 static int genregs64_set(struct task_struct *target,
 258                          const struct user_regset *regset,
 259                          unsigned int pos, unsigned int count,
 260                          const void *kbuf, const void __user *ubuf)
 261 {
 262         struct pt_regs *regs = task_pt_regs(target);
 263         int ret;
 264
 265         if (target == current)
 266                 flushw_user();
 267
 268         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 269                                  regs->u_regs,
 270                                  0, 16 * sizeof(u64));
 271         if (!ret && count && pos < (32 * sizeof(u64))) {
 272                 struct reg_window window;
 273
 274                 if (regwindow64_get(target, regs, &window))
 275                         return -EFAULT;
 276
 277                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 278                                          &window,
 279                                          16 * sizeof(u64),
 280                                          32 * sizeof(u64));
 281
 282                 if (!ret &&
 283                     regwindow64_set(target, regs, &window))
 284                         return -EFAULT;
 285         }
 286
 287         if (!ret && count > 0) {
 288                 unsigned long tstate;
 289
 290                 /* TSTATE */
 291                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 292                                          &tstate,
 293                                          32 * sizeof(u64),
 294                                          33 * sizeof(u64));
 295                 if (!ret) {
 296                         /* Only the condition codes and the "in syscall"
 297                          * state can be modified in the %tstate register.
 298                          */
 299                         tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 300                         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 301                         regs->tstate |= tstate;
 302                 }
 303         }
 304
 305         if (!ret) {
 306                 /* TPC, TNPC */
 307                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 308                                          &regs->tpc,
 309                                          33 * sizeof(u64),
 310                                          35 * sizeof(u64));
 311         }
 312
 313         if (!ret) {
 314                 unsigned long y;
 315
 316                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 317                                          &y,
 318                                          35 * sizeof(u64),
 319                                          36 * sizeof(u64));
 320                 if (!ret)
 321                         regs->y = y;
 322         }
 323
 324         if (!ret)
 325                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 326                                                 36 * sizeof(u64), -1);
 327
 328         return ret;
 329 }
 330
 331 static int fpregs64_get(struct task_struct *target,
 332                         const struct user_regset *regset,
 333                         unsigned int pos, unsigned int count,
 334                         void *kbuf, void __user *ubuf)
 335 {
 336         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 337         unsigned long fprs, fsr, gsr;
 338         int ret;
 339
 340         if (target == current)
 341                 save_and_clear_fpu();
 342
 343         fprs = task_thread_info(target)->fpsaved[0];
 344
 345         if (fprs & FPRS_DL)
 346                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 347                                           fpregs,
 348                                           0, 16 * sizeof(u64));
 349         else
 350                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 351                                                0,
 352                                                16 * sizeof(u64));
 353
 354         if (!ret) {
 355                 if (fprs & FPRS_DU)
 356                         ret = user_regset_copyout(&pos, &count,
 357                                                   &kbuf, &ubuf,
 358                                                   fpregs + 16,
 359                                                   16 * sizeof(u64),
 360                                                   32 * sizeof(u64));
 361                 else
 362                         ret = user_regset_copyout_zero(&pos, &count,
 363                                                        &kbuf, &ubuf,
 364                                                        16 * sizeof(u64),
 365                                                        32 * sizeof(u64));
 366         }
 367
 368         if (fprs & FPRS_FEF) {
 369                 fsr = task_thread_info(target)->xfsr[0];
 370                 gsr = task_thread_info(target)->gsr[0];
 371         } else {
 372                 fsr = gsr = 0;
 373         }
 374
 375         if (!ret)
 376                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 377                                           &fsr,
 378                                           32 * sizeof(u64),
 379                                           33 * sizeof(u64));
 380         if (!ret)
 381                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 382                                           &gsr,
 383                                           33 * sizeof(u64),
 384                                           34 * sizeof(u64));
 385         if (!ret)
 386                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 387                                           &fprs,
 388                                           34 * sizeof(u64),
 389                                           35 * sizeof(u64));
 390
 391         if (!ret)
 392                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 393                                                35 * sizeof(u64), -1);
 394
 395         return ret;
 396 }
 397
 398 static int fpregs64_set(struct task_struct *target,
 399                         const struct user_regset *regset,
 400                         unsigned int pos, unsigned int count,
 401                         const void *kbuf, const void __user *ubuf)
 402 {
 403         unsigned long *fpregs = task_thread_info(target)->fpregs;
 404         unsigned long fprs;
 405         int ret;
 406
 407         if (target == current)
 408                 save_and_clear_fpu();
 409
 410         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 411                                  fpregs,
 412                                  0, 32 * sizeof(u64));
 413         if (!ret)
 414                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 415                                          task_thread_info(target)->xfsr,
 416                                          32 * sizeof(u64),
 417                                          33 * sizeof(u64));
 418         if (!ret)
 419                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 420                                          task_thread_info(target)->gsr,
 421                                          33 * sizeof(u64),
 422                                          34 * sizeof(u64));
 423
 424         fprs = task_thread_info(target)->fpsaved[0];
 425         if (!ret && count > 0) {
 426                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 427                                          &fprs,
 428                                          34 * sizeof(u64),
 429                                          35 * sizeof(u64));
 430         }
 431
 432         fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 433         task_thread_info(target)->fpsaved[0] = fprs;
 434
 435         if (!ret)
 436                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 437                                                 35 * sizeof(u64), -1);
 438         return ret;
 439 }
 440
 441 static const struct user_regset sparc64_regsets[] = {
 442         /* Format is:
 443          *      G0 --> G7
 444          *      O0 --> O7
 445          *      L0 --> L7
 446          *      I0 --> I7
 447          *      TSTATE, TPC, TNPC, Y
 448          */
 449         [REGSET_GENERAL] = {
 450                 .core_note_type = NT_PRSTATUS,
 451                 .n = 36,
 452                 .size = sizeof(u64), .align = sizeof(u64),
 453                 .get = genregs64_get, .set = genregs64_set
 454         },
 455         /* Format is:
 456          *      F0 --> F63
 457          *      FSR
 458          *      GSR
 459          *      FPRS
 460          */
 461         [REGSET_FP] = {
 462                 .core_note_type = NT_PRFPREG,
 463                 .n = 35,
 464                 .size = sizeof(u64), .align = sizeof(u64),
 465                 .get = fpregs64_get, .set = fpregs64_set
 466         },
 467 };
 468
 469 static const struct user_regset_view user_sparc64_view = {
 470         .name = "sparc64", .e_machine = EM_SPARCV9,
 471         .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
 472 };
 473
 474 #ifdef CONFIG_COMPAT
 475 static int genregs32_get(struct task_struct *target,
 476                          const struct user_regset *regset,
 477                          unsigned int pos, unsigned int count,
 478                          void *kbuf, void __user *ubuf)
 479 {
 480         const struct pt_regs *regs = task_pt_regs(target);
 481         compat_ulong_t __user *reg_window;
 482         compat_ulong_t *k = kbuf;
 483         compat_ulong_t __user *u = ubuf;
 484         compat_ulong_t reg;
 485
 486         if (target == current)
 487                 flushw_user();
 488
 489         pos /= sizeof(reg);
 490         count /= sizeof(reg);
 491
 492         if (kbuf) {
 493                 for (; count > 0 && pos < 16; count--)
 494                         *k++ = regs->u_regs[pos++];
 495
 496                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 497                 reg_window -= 16;
 498                 if (target == current) {
 499                         for (; count > 0 && pos < 32; count--) {
 500                                 if (get_user(*k++, &reg_window[pos++]))
 501                                         return -EFAULT;
 502                         }
 503                 } else {
 504                         for (; count > 0 && pos < 32; count--) {
 505                                 if (access_process_vm(target,
 506                                                       (unsigned long)
 507                                                       &reg_window[pos],
 508                                                       k, sizeof(*k), 0)
 509                                     != sizeof(*k))
 510                                         return -EFAULT;
 511                                 k++;
 512                                 pos++;
 513                         }
 514                 }
 515         } else {
 516                 for (; count > 0 && pos < 16; count--) {
 517                         if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
 518                                 return -EFAULT;
 519                 }
 520
 521                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 522                 reg_window -= 16;
 523                 if (target == current) {
 524                         for (; count > 0 && pos < 32; count--) {
 525                                 if (get_user(reg, &reg_window[pos++]) ||
 526                                     put_user(reg, u++))
 527                                         return -EFAULT;
 528                         }
 529                 } else {
 530                         for (; count > 0 && pos < 32; count--) {
 531                                 if (access_process_vm(target,
 532                                                       (unsigned long)
 533                                                       &reg_window[pos],
 534                                                       &reg, sizeof(reg), 0)
 535                                     != sizeof(reg))
 536                                         return -EFAULT;
 537                                 if (access_process_vm(target,
 538                                                       (unsigned long) u,
 539                                                       &reg, sizeof(reg), 1)
 540                                     != sizeof(reg))
 541                                         return -EFAULT;
 542                                 pos++;
 543                                 u++;
 544                         }
 545                 }
 546         }
 547         while (count > 0) {
 548                 switch (pos) {
 549                 case 32: /* PSR */
 550                         reg = tstate_to_psr(regs->tstate);
 551                         break;
 552                 case 33: /* PC */
 553                         reg = regs->tpc;
 554                         break;
 555                 case 34: /* NPC */
 556                         reg = regs->tnpc;
 557                         break;
 558                 case 35: /* Y */
 559                         reg = regs->y;
 560                         break;
 561                 case 36: /* WIM */
 562                 case 37: /* TBR */
 563                         reg = 0;
 564                         break;
 565                 default:
 566                         goto finish;
 567                 }
 568
 569                 if (kbuf)
 570                         *k++ = reg;
 571                 else if (put_user(reg, u++))
 572                         return -EFAULT;
 573                 pos++;
 574                 count--;
 575         }
 576 finish:
 577         pos *= sizeof(reg);
 578         count *= sizeof(reg);
 579
 580         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 581                                         38 * sizeof(reg), -1);
 582 }
 583
 584 static int genregs32_set(struct task_struct *target,
 585                          const struct user_regset *regset,
 586                          unsigned int pos, unsigned int count,
 587                          const void *kbuf, const void __user *ubuf)
 588 {
 589         struct pt_regs *regs = task_pt_regs(target);
 590         compat_ulong_t __user *reg_window;
 591         const compat_ulong_t *k = kbuf;
 592         const compat_ulong_t __user *u = ubuf;
 593         compat_ulong_t reg;
 594
 595         if (target == current)
 596                 flushw_user();
 597
 598         pos /= sizeof(reg);
 599         count /= sizeof(reg);
 600
 601         if (kbuf) {
 602                 for (; count > 0 && pos < 16; count--)
 603                         regs->u_regs[pos++] = *k++;
 604
 605                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 606                 reg_window -= 16;
 607                 if (target == current) {
 608                         for (; count > 0 && pos < 32; count--) {
 609                                 if (put_user(*k++, &reg_window[pos++]))
 610                                         return -EFAULT;
 611                         }
 612                 } else {
 613                         for (; count > 0 && pos < 32; count--) {
 614                                 if (access_process_vm(target,
 615                                                       (unsigned long)
 616                                                       &reg_window[pos],
 617                                                       (void *) k,
 618                                                       sizeof(*k), 1)
 619                                     != sizeof(*k))
 620                                         return -EFAULT;
 621                                 k++;
 622                                 pos++;
 623                         }
 624                 }
 625         } else {
 626                 for (; count > 0 && pos < 16; count--) {
 627                         if (get_user(reg, u++))
 628                                 return -EFAULT;
 629                         regs->u_regs[pos++] = reg;
 630                 }
 631
 632                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 633                 reg_window -= 16;
 634                 if (target == current) {
 635                         for (; count > 0 && pos < 32; count--) {
 636                                 if (get_user(reg, u++) ||
 637                                     put_user(reg, &reg_window[pos++]))
 638                                         return -EFAULT;
 639                         }
 640                 } else {
 641                         for (; count > 0 && pos < 32; count--) {
 642                                 if (access_process_vm(target,
 643                                                       (unsigned long)
 644                                                       u,
 645                                                       &reg, sizeof(reg), 0)
 646                                     != sizeof(reg))
 647                                         return -EFAULT;
 648                                 if (access_process_vm(target,
 649                                                       (unsigned long)
 650                                                       &reg_window[pos],
 651                                                       &reg, sizeof(reg), 1)
 652                                     != sizeof(reg))
 653                                         return -EFAULT;
 654                                 pos++;
 655                                 u++;
 656                         }
 657                 }
 658         }
 659         while (count > 0) {
 660                 unsigned long tstate;
 661
 662                 if (kbuf)
 663                         reg = *k++;
 664                 else if (get_user(reg, u++))
 665                         return -EFAULT;
 666
 667                 switch (pos) {
 668                 case 32: /* PSR */
 669                         tstate = regs->tstate;
 670                         tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 671                         tstate |= psr_to_tstate_icc(reg);
 672                         if (reg & PSR_SYSCALL)
 673                                 tstate |= TSTATE_SYSCALL;
 674                         regs->tstate = tstate;
 675                         break;
 676                 case 33: /* PC */
 677                         regs->tpc = reg;
 678                         break;
 679                 case 34: /* NPC */
 680                         regs->tnpc = reg;
 681                         break;
 682                 case 35: /* Y */
 683                         regs->y = reg;
 684                         break;
 685                 case 36: /* WIM */
 686                 case 37: /* TBR */
 687                         break;
 688                 default:
 689                         goto finish;
 690                 }
 691
 692                 pos++;
 693                 count--;
 694         }
 695 finish:
 696         pos *= sizeof(reg);
 697         count *= sizeof(reg);
 698
 699         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 700                                          38 * sizeof(reg), -1);
 701 }
 702
 703 static int fpregs32_get(struct task_struct *target,
 704                         const struct user_regset *regset,
 705                         unsigned int pos, unsigned int count,
 706                         void *kbuf, void __user *ubuf)
 707 {
 708         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 709         compat_ulong_t enabled;
 710         unsigned long fprs;
 711         compat_ulong_t fsr;
 712         int ret = 0;
 713
 714         if (target == current)
 715                 save_and_clear_fpu();
 716
 717         fprs = task_thread_info(target)->fpsaved[0];
 718         if (fprs & FPRS_FEF) {
 719                 fsr = task_thread_info(target)->xfsr[0];
 720                 enabled = 1;
 721         } else {
 722                 fsr = 0;
 723                 enabled = 0;
 724         }
 725
 726         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 727                                   fpregs,
 728                                   0, 32 * sizeof(u32));
 729
 730         if (!ret)
 731                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 732                                                32 * sizeof(u32),
 733                                                33 * sizeof(u32));
 734         if (!ret)
 735                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 736                                           &fsr,
 737                                           33 * sizeof(u32),
 738                                           34 * sizeof(u32));
 739
 740         if (!ret) {
 741                 compat_ulong_t val;
 742
 743                 val = (enabled << 8) | (8 << 16);
 744                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 745                                           &val,
 746                                           34 * sizeof(u32),
 747                                           35 * sizeof(u32));
 748         }
 749
 750         if (!ret)
 751                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 752                                                35 * sizeof(u32), -1);
 753
 754         return ret;
 755 }
 756
 757 static int fpregs32_set(struct task_struct *target,
 758                         const struct user_regset *regset,
 759                         unsigned int pos, unsigned int count,
 760                         const void *kbuf, const void __user *ubuf)
 761 {
 762         unsigned long *fpregs = task_thread_info(target)->fpregs;
 763         unsigned long fprs;
 764         int ret;
 765
 766         if (target == current)
 767                 save_and_clear_fpu();
 768
 769         fprs = task_thread_info(target)->fpsaved[0];
 770
 771         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 772                                  fpregs,
 773                                  0, 32 * sizeof(u32));
 774         if (!ret)
 775                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 776                                           32 * sizeof(u32),
 777                                           33 * sizeof(u32));
 778         if (!ret && count > 0) {
 779                 compat_ulong_t fsr;
 780                 unsigned long val;
 781
 782                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 783                                          &fsr,
 784                                          33 * sizeof(u32),
 785                                          34 * sizeof(u32));
 786                 if (!ret) {
 787                         val = task_thread_info(target)->xfsr[0];
 788                         val &= 0xffffffff00000000UL;
 789                         val |= fsr;
 790                         task_thread_info(target)->xfsr[0] = val;
 791                 }
 792         }
 793
 794         fprs |= (FPRS_FEF | FPRS_DL);
 795         task_thread_info(target)->fpsaved[0] = fprs;
 796
 797         if (!ret)
 798                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 799                                                 34 * sizeof(u32), -1);
 800         return ret;
 801 }
 802
 803 static const struct user_regset sparc32_regsets[] = {
 804         /* Format is:
 805          *      G0 --> G7
 806          *      O0 --> O7
 807          *      L0 --> L7
 808          *      I0 --> I7
 809          *      PSR, PC, nPC, Y, WIM, TBR
 810          */
 811         [REGSET_GENERAL] = {
 812                 .core_note_type = NT_PRSTATUS,
 813                 .n = 38,
 814                 .size = sizeof(u32), .align = sizeof(u32),
 815                 .get = genregs32_get, .set = genregs32_set
 816         },
 817         /* Format is:
 818          *      F0 --> F31
 819          *      empty 32-bit word
 820          *      FSR (32--bit word)
 821          *      FPU QUEUE COUNT (8-bit char)
 822          *      FPU QUEUE ENTRYSIZE (8-bit char)
 823          *      FPU ENABLED (8-bit char)
 824          *      empty 8-bit char
 825          *      FPU QUEUE (64 32-bit ints)
 826          */
 827         [REGSET_FP] = {
 828                 .core_note_type = NT_PRFPREG,
 829                 .n = 99,
 830                 .size = sizeof(u32), .align = sizeof(u32),
 831                 .get = fpregs32_get, .set = fpregs32_set
 832         },
 833 };
 834
 835 static const struct user_regset_view user_sparc32_view = {
 836         .name = "sparc", .e_machine = EM_SPARC,
 837         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 838 };
 839 #endif /* CONFIG_COMPAT */
 840
 841 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 842 {
 843 #ifdef CONFIG_COMPAT
 844         if (test_tsk_thread_flag(task, TIF_32BIT))
 845                 return &user_sparc32_view;
 846 #endif
 847         return &user_sparc64_view;
 848 }
 849
 850 #ifdef CONFIG_COMPAT
 851 struct compat_fps {
 852         unsigned int regs[32];
 853         unsigned int fsr;
 854         unsigned int flags;
 855         unsigned int extra;
 856         unsigned int fpqd;
 857         struct compat_fq {
 858                 unsigned int insnaddr;
 859                 unsigned int insn;
 860         } fpq[16];
 861 };
 862
 863 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 864                         compat_ulong_t caddr, compat_ulong_t cdata)
 865 {
 866         const struct user_regset_view *view = task_user_regset_view(current);
 867         compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
 868         struct pt_regs32 __user *pregs;
 869         struct compat_fps __user *fps;
 870         unsigned long addr2 = caddr2;
 871         unsigned long addr = caddr;
 872         unsigned long data = cdata;
 873         int ret;
 874
 875         pregs = (struct pt_regs32 __user *) addr;
 876         fps = (struct compat_fps __user *) addr;
 877
 878         switch (request) {
 879         case PTRACE_PEEKUSR:
 880                 ret = (addr != 0) ? -EIO : 0;
 881                 break;
 882
 883         case PTRACE_GETREGS:
 884                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 885                                           32 * sizeof(u32),
 886                                           4 * sizeof(u32),
 887                                           &pregs->psr);
 888                 if (!ret)
 889                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 890                                                   1 * sizeof(u32),
 891                                                   15 * sizeof(u32),
 892                                                   &pregs->u_regs[0]);
 893                 break;
 894
 895         case PTRACE_SETREGS:
 896                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 897                                             32 * sizeof(u32),
 898                                             4 * sizeof(u32),
 899                                             &pregs->psr);
 900                 if (!ret)
 901                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 902                                                     1 * sizeof(u32),
 903                                                     15 * sizeof(u32),
 904                                                     &pregs->u_regs[0]);
 905                 break;
 906
 907         case PTRACE_GETFPREGS:
 908                 ret = copy_regset_to_user(child, view, REGSET_FP,
 909                                           0 * sizeof(u32),
 910                                           32 * sizeof(u32),
 911                                           &fps->regs[0]);
 912                 if (!ret)
 913                         ret = copy_regset_to_user(child, view, REGSET_FP,
 914                                                   33 * sizeof(u32),
 915                                                   1 * sizeof(u32),
 916                                                   &fps->fsr);
 917                 if (!ret) {
 918                         if (__put_user(0, &fps->flags) ||
 919                             __put_user(0, &fps->extra) ||
 920                             __put_user(0, &fps->fpqd) ||
 921                             clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
 922                                 ret = -EFAULT;
 923                 }
 924                 break;
 925
 926         case PTRACE_SETFPREGS:
 927                 ret = copy_regset_from_user(child, view, REGSET_FP,
 928                                             0 * sizeof(u32),
 929                                             32 * sizeof(u32),
 930                                             &fps->regs[0]);
 931                 if (!ret)
 932                         ret = copy_regset_from_user(child, view, REGSET_FP,
 933                                                     33 * sizeof(u32),
 934                                                     1 * sizeof(u32),
 935                                                     &fps->fsr);
 936                 break;
 937
 938         case PTRACE_READTEXT:
 939         case PTRACE_READDATA:
 940                 ret = ptrace_readdata(child, addr,
 941                                       (char __user *)addr2, data);
 942                 if (ret == data)
 943                         ret = 0;
 944                 else if (ret >= 0)
 945                         ret = -EIO;
 946                 break;
 947
 948         case PTRACE_WRITETEXT:
 949         case PTRACE_WRITEDATA:
 950                 ret = ptrace_writedata(child, (char __user *) addr2,
 951                                        addr, data);
 952                 if (ret == data)
 953                         ret = 0;
 954                 else if (ret >= 0)
 955                         ret = -EIO;
 956                 break;
 957
 958         default:
 959                 if (request == PTRACE_SPARC_DETACH)
 960                         request = PTRACE_DETACH;
 961                 ret = compat_ptrace_request(child, request, addr, data);
 962                 break;
 963         }
 964
 965         return ret;
 966 }
 967 #endif /* CONFIG_COMPAT */
 968
 969 struct fps {
 970         unsigned int regs[64];
 971         unsigned long fsr;
 972 };
 973
 974 long arch_ptrace(struct task_struct *child, long request,
 975                  unsigned long addr, unsigned long data)
 976 {
 977         const struct user_regset_view *view = task_user_regset_view(current);
 978         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
 979         struct pt_regs __user *pregs;
 980         struct fps __user *fps;
 981         void __user *addr2p;
 982         int ret;
 983
 984         pregs = (struct pt_regs __user *) addr;
 985         fps = (struct fps __user *) addr;
 986         addr2p = (void __user *) addr2;
 987
 988         switch (request) {
 989         case PTRACE_PEEKUSR:
 990                 ret = (addr != 0) ? -EIO : 0;
 991                 break;
 992
 993         case PTRACE_GETREGS64:
 994                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 995                                           1 * sizeof(u64),
 996                                           15 * sizeof(u64),
 997                                           &pregs->u_regs[0]);
 998                 if (!ret) {
 999                         /* XXX doesn't handle 'y' register correctly XXX */
1000                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1001                                                   32 * sizeof(u64),
1002                                                   4 * sizeof(u64),
1003                                                   &pregs->tstate);
1004                 }
1005                 break;
1006
1007         case PTRACE_SETREGS64:
1008                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1009                                             1 * sizeof(u64),
1010                                             15 * sizeof(u64),
1011                                             &pregs->u_regs[0]);
1012                 if (!ret) {
1013                         /* XXX doesn't handle 'y' register correctly XXX */
1014                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1015                                                     32 * sizeof(u64),
1016                                                     4 * sizeof(u64),
1017                                                     &pregs->tstate);
1018                 }
1019                 break;
1020
1021         case PTRACE_GETFPREGS64:
1022                 ret = copy_regset_to_user(child, view, REGSET_FP,
1023                                           0 * sizeof(u64),
1024                                           33 * sizeof(u64),
1025                                           fps);
1026                 break;
1027
1028         case PTRACE_SETFPREGS64:
1029                 ret = copy_regset_from_user(child, view, REGSET_FP,
1030                                           0 * sizeof(u64),
1031                                           33 * sizeof(u64),
1032                                           fps);
1033                 break;
1034
1035         case PTRACE_READTEXT:
1036         case PTRACE_READDATA:
1037                 ret = ptrace_readdata(child, addr, addr2p, data);
1038                 if (ret == data)
1039                         ret = 0;
1040                 else if (ret >= 0)
1041                         ret = -EIO;
1042                 break;
1043
1044         case PTRACE_WRITETEXT:
1045         case PTRACE_WRITEDATA:
1046                 ret = ptrace_writedata(child, addr2p, addr, data);
1047                 if (ret == data)
1048                         ret = 0;
1049                 else if (ret >= 0)
1050                         ret = -EIO;
1051                 break;
1052
1053         default:
1054                 if (request == PTRACE_SPARC_DETACH)
1055                         request = PTRACE_DETACH;
1056                 ret = ptrace_request(child, request, addr, data);
1057                 break;
1058         }
1059
1060         return ret;
1061 }
1062
1063 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1064 {
1065         int ret = 0;
1066
1067         /* do the secure computing check first */
1068         secure_computing_strict(regs->u_regs[UREG_G1]);
1069
1070         if (test_thread_flag(TIF_NOHZ))
1071                 user_exit();
1072
1073         if (test_thread_flag(TIF_SYSCALL_TRACE))
1074                 ret = tracehook_report_syscall_entry(regs);
1075
1076         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1077                 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1078
1079         audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
1080                             regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
1081                             regs->u_regs[UREG_I3]);
1082
1083         return ret;
1084 }
1085
1086 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1087 {
1088         if (test_thread_flag(TIF_NOHZ))
1089                 user_exit();
1090
1091         audit_syscall_exit(regs);
1092
1093         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1094                 trace_sys_exit(regs, regs->u_regs[UREG_I0]);
1095
1096         if (test_thread_flag(TIF_SYSCALL_TRACE))
1097                 tracehook_report_syscall_exit(regs, 0);
1098
1099         if (test_thread_flag(TIF_NOHZ))
1100                 user_enter();
1101 }