arch/sparc/kernel/ptrace_64.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/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 = regs->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 (put_user(reg, u++))
 538                                         return -EFAULT;
 539                         }
 540                 }
 541         }
 542         while (count > 0) {
 543                 switch (pos) {
 544                 case 32: /* PSR */
 545                         reg = tstate_to_psr(regs->tstate);
 546                         break;
 547                 case 33: /* PC */
 548                         reg = regs->tpc;
 549                         break;
 550                 case 34: /* NPC */
 551                         reg = regs->tnpc;
 552                         break;
 553                 case 35: /* Y */
 554                         reg = regs->y;
 555                         break;
 556                 case 36: /* WIM */
 557                 case 37: /* TBR */
 558                         reg = 0;
 559                         break;
 560                 default:
 561                         goto finish;
 562                 }
 563
 564                 if (kbuf)
 565                         *k++ = reg;
 566                 else if (put_user(reg, u++))
 567                         return -EFAULT;
 568                 pos++;
 569                 count--;
 570         }
 571 finish:
 572         pos *= sizeof(reg);
 573         count *= sizeof(reg);
 574
 575         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 576                                         38 * sizeof(reg), -1);
 577 }
 578
 579 static int genregs32_set(struct task_struct *target,
 580                          const struct user_regset *regset,
 581                          unsigned int pos, unsigned int count,
 582                          const void *kbuf, const void __user *ubuf)
 583 {
 584         struct pt_regs *regs = task_pt_regs(target);
 585         compat_ulong_t __user *reg_window;
 586         const compat_ulong_t *k = kbuf;
 587         const compat_ulong_t __user *u = ubuf;
 588         compat_ulong_t reg;
 589
 590         if (target == current)
 591                 flushw_user();
 592
 593         pos /= sizeof(reg);
 594         count /= sizeof(reg);
 595
 596         if (kbuf) {
 597                 for (; count > 0 && pos < 16; count--)
 598                         regs->u_regs[pos++] = *k++;
 599
 600                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 601                 reg_window -= 16;
 602                 if (target == current) {
 603                         for (; count > 0 && pos < 32; count--) {
 604                                 if (put_user(*k++, &reg_window[pos++]))
 605                                         return -EFAULT;
 606                         }
 607                 } else {
 608                         for (; count > 0 && pos < 32; count--) {
 609                                 if (access_process_vm(target,
 610                                                       (unsigned long)
 611                                                       &reg_window[pos],
 612                                                       (void *) k,
 613                                                       sizeof(*k), 1)
 614                                     != sizeof(*k))
 615                                         return -EFAULT;
 616                                 k++;
 617                                 pos++;
 618                         }
 619                 }
 620         } else {
 621                 for (; count > 0 && pos < 16; count--) {
 622                         if (get_user(reg, u++))
 623                                 return -EFAULT;
 624                         regs->u_regs[pos++] = reg;
 625                 }
 626
 627                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 628                 reg_window -= 16;
 629                 if (target == current) {
 630                         for (; count > 0 && pos < 32; count--) {
 631                                 if (get_user(reg, u++) ||
 632                                     put_user(reg, &reg_window[pos++]))
 633                                         return -EFAULT;
 634                         }
 635                 } else {
 636                         for (; count > 0 && pos < 32; count--) {
 637                                 if (get_user(reg, u++))
 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,
 966                  unsigned long addr, unsigned long data)
 967 {
 968         const struct user_regset_view *view = task_user_regset_view(current);
 969         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
 970         struct pt_regs __user *pregs;
 971         struct fps __user *fps;
 972         void __user *addr2p;
 973         int ret;
 974
 975         pregs = (struct pt_regs __user *) addr;
 976         fps = (struct fps __user *) addr;
 977         addr2p = (void __user *) addr2;
 978
 979         switch (request) {
 980         case PTRACE_PEEKUSR:
 981                 ret = (addr != 0) ? -EIO : 0;
 982                 break;
 983
 984         case PTRACE_GETREGS64:
 985                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 986                                           1 * sizeof(u64),
 987                                           15 * sizeof(u64),
 988                                           &pregs->u_regs[0]);
 989                 if (!ret) {
 990                         /* XXX doesn't handle 'y' register correctly XXX */
 991                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 992                                                   32 * sizeof(u64),
 993                                                   4 * sizeof(u64),
 994                                                   &pregs->tstate);
 995                 }
 996                 break;
 997
 998         case PTRACE_SETREGS64:
 999                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1000                                             1 * sizeof(u64),
1001                                             15 * sizeof(u64),
1002                                             &pregs->u_regs[0]);
1003                 if (!ret) {
1004                         /* XXX doesn't handle 'y' register correctly XXX */
1005                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1006                                                     32 * sizeof(u64),
1007                                                     4 * sizeof(u64),
1008                                                     &pregs->tstate);
1009                 }
1010                 break;
1011
1012         case PTRACE_GETFPREGS64:
1013                 ret = copy_regset_to_user(child, view, REGSET_FP,
1014                                           0 * sizeof(u64),
1015                                           33 * sizeof(u64),
1016                                           fps);
1017                 break;
1018
1019         case PTRACE_SETFPREGS64:
1020                 ret = copy_regset_from_user(child, view, REGSET_FP,
1021                                           0 * sizeof(u64),
1022                                           33 * sizeof(u64),
1023                                           fps);
1024                 break;
1025
1026         case PTRACE_READTEXT:
1027         case PTRACE_READDATA:
1028                 ret = ptrace_readdata(child, addr, addr2p, data);
1029                 if (ret == data)
1030                         ret = 0;
1031                 else if (ret >= 0)
1032                         ret = -EIO;
1033                 break;
1034
1035         case PTRACE_WRITETEXT:
1036         case PTRACE_WRITEDATA:
1037                 ret = ptrace_writedata(child, addr2p, addr, data);
1038                 if (ret == data)
1039                         ret = 0;
1040                 else if (ret >= 0)
1041                         ret = -EIO;
1042                 break;
1043
1044         default:
1045                 if (request == PTRACE_SPARC_DETACH)
1046                         request = PTRACE_DETACH;
1047                 ret = ptrace_request(child, request, addr, data);
1048                 break;
1049         }
1050
1051         return ret;
1052 }
1053
1054 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1055 {
1056         int ret = 0;
1057
1058         /* do the secure computing check first */
1059         secure_computing_strict(regs->u_regs[UREG_G1]);
1060
1061         if (test_thread_flag(TIF_NOHZ))
1062                 user_exit();
1063
1064         if (test_thread_flag(TIF_SYSCALL_TRACE))
1065                 ret = tracehook_report_syscall_entry(regs);
1066
1067         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1068                 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1069
1070         audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
1071                             regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
1072                             regs->u_regs[UREG_I3]);
1073
1074         return ret;
1075 }
1076
1077 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1078 {
1079         if (test_thread_flag(TIF_NOHZ))
1080                 user_exit();
1081
1082         audit_syscall_exit(regs);
1083
1084         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1085                 trace_sys_exit(regs, regs->u_regs[UREG_I0]);
1086
1087         if (test_thread_flag(TIF_SYSCALL_TRACE))
1088                 tracehook_report_syscall_exit(regs, 0);
1089
1090         if (test_thread_flag(TIF_NOHZ))
1091                 user_enter();
1092 }