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