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
  31 #include <asm/asi.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/uaccess.h>
  34 #include <asm/psrcompat.h>
  35 #include <asm/visasm.h>
  36 #include <asm/spitfire.h>
  37 #include <asm/page.h>
  38 #include <asm/cpudata.h>
  39 #include <asm/cacheflush.h>
  40
  41 #define CREATE_TRACE_POINTS
  42 #include <trace/events/syscalls.h>
  43
  44 #include "entry.h"
  45
  46 /* #define ALLOW_INIT_TRACING */
  47
  48 /*
  49  * Called by kernel/ptrace.c when detaching..
  50  *
  51  * Make sure single step bits etc are not set.
  52  */
  53 void ptrace_disable(struct task_struct *child)
  54 {
  55         /* nothing to do */
  56 }
  57
  58 /* To get the necessary page struct, access_process_vm() first calls
  59  * get_user_pages().  This has done a flush_dcache_page() on the
  60  * accessed page.  Then our caller (copy_{to,from}_user_page()) did
  61  * to memcpy to read/write the data from that page.
  62  *
  63  * Now, the only thing we have to do is:
  64  * 1) flush the D-cache if it's possible than an illegal alias
  65  *    has been created
  66  * 2) flush the I-cache if this is pre-cheetah and we did a write
  67  */
  68 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
  69                          unsigned long uaddr, void *kaddr,
  70                          unsigned long len, int write)
  71 {
  72         BUG_ON(len > PAGE_SIZE);
  73
  74         if (tlb_type == hypervisor)
  75                 return;
  76
  77         preempt_disable();
  78
  79 #ifdef DCACHE_ALIASING_POSSIBLE
  80         /* If bit 13 of the kernel address we used to access the
  81          * user page is the same as the virtual address that page
  82          * is mapped to in the user's address space, we can skip the
  83          * D-cache flush.
  84          */
  85         if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
  86                 unsigned long start = __pa(kaddr);
  87                 unsigned long end = start + len;
  88                 unsigned long dcache_line_size;
  89
  90                 dcache_line_size = local_cpu_data().dcache_line_size;
  91
  92                 if (tlb_type == spitfire) {
  93                         for (; start < end; start += dcache_line_size)
  94                                 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
  95                 } else {
  96                         start &= ~(dcache_line_size - 1);
  97                         for (; start < end; start += dcache_line_size)
  98                                 __asm__ __volatile__(
  99                                         "stxa %%g0, [%0] %1\n\t"
 100                                         "membar #Sync"
 101                                         : /* no outputs */
 102                                         : "r" (start),
 103                                         "i" (ASI_DCACHE_INVALIDATE));
 104                 }
 105         }
 106 #endif
 107         if (write && tlb_type == spitfire) {
 108                 unsigned long start = (unsigned long) kaddr;
 109                 unsigned long end = start + len;
 110                 unsigned long icache_line_size;
 111
 112                 icache_line_size = local_cpu_data().icache_line_size;
 113
 114                 for (; start < end; start += icache_line_size)
 115                         flushi(start);
 116         }
 117
 118         preempt_enable();
 119 }
 120 EXPORT_SYMBOL_GPL(flush_ptrace_access);
 121
 122 static int get_from_target(struct task_struct *target, unsigned long uaddr,
 123                            void *kbuf, int len)
 124 {
 125         if (target == current) {
 126                 if (copy_from_user(kbuf, (void __user *) uaddr, len))
 127                         return -EFAULT;
 128         } else {
 129                 int len2 = access_process_vm(target, uaddr, kbuf, len, 0);
 130                 if (len2 != len)
 131                         return -EFAULT;
 132         }
 133         return 0;
 134 }
 135
 136 static int set_to_target(struct task_struct *target, unsigned long uaddr,
 137                          void *kbuf, int len)
 138 {
 139         if (target == current) {
 140                 if (copy_to_user((void __user *) uaddr, kbuf, len))
 141                         return -EFAULT;
 142         } else {
 143                 int len2 = access_process_vm(target, uaddr, kbuf, len, 1);
 144                 if (len2 != len)
 145                         return -EFAULT;
 146         }
 147         return 0;
 148 }
 149
 150 static int regwindow64_get(struct task_struct *target,
 151                            const struct pt_regs *regs,
 152                            struct reg_window *wbuf)
 153 {
 154         unsigned long rw_addr = regs->u_regs[UREG_I6];
 155
 156         if (!test_thread_64bit_stack(rw_addr)) {
 157                 struct reg_window32 win32;
 158                 int i;
 159
 160                 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
 161                         return -EFAULT;
 162                 for (i = 0; i < 8; i++)
 163                         wbuf->locals[i] = win32.locals[i];
 164                 for (i = 0; i < 8; i++)
 165                         wbuf->ins[i] = win32.ins[i];
 166         } else {
 167                 rw_addr += STACK_BIAS;
 168                 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 169                         return -EFAULT;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int regwindow64_set(struct task_struct *target,
 176                            const struct pt_regs *regs,
 177                            struct reg_window *wbuf)
 178 {
 179         unsigned long rw_addr = regs->u_regs[UREG_I6];
 180
 181         if (!test_thread_64bit_stack(rw_addr)) {
 182                 struct reg_window32 win32;
 183                 int i;
 184
 185                 for (i = 0; i < 8; i++)
 186                         win32.locals[i] = wbuf->locals[i];
 187                 for (i = 0; i < 8; i++)
 188                         win32.ins[i] = wbuf->ins[i];
 189
 190                 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
 191                         return -EFAULT;
 192         } else {
 193                 rw_addr += STACK_BIAS;
 194                 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 195                         return -EFAULT;
 196         }
 197
 198         return 0;
 199 }
 200
 201 enum sparc_regset {
 202         REGSET_GENERAL,
 203         REGSET_FP,
 204 };
 205
 206 static int genregs64_get(struct task_struct *target,
 207                          const struct user_regset *regset,
 208                          unsigned int pos, unsigned int count,
 209                          void *kbuf, void __user *ubuf)
 210 {
 211         const struct pt_regs *regs = task_pt_regs(target);
 212         int ret;
 213
 214         if (target == current)
 215                 flushw_user();
 216
 217         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 218                                   regs->u_regs,
 219                                   0, 16 * sizeof(u64));
 220         if (!ret && count && pos < (32 * sizeof(u64))) {
 221                 struct reg_window window;
 222
 223                 if (regwindow64_get(target, regs, &window))
 224                         return -EFAULT;
 225                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 226                                           &window,
 227                                           16 * sizeof(u64),
 228                                           32 * sizeof(u64));
 229         }
 230
 231         if (!ret) {
 232                 /* TSTATE, TPC, TNPC */
 233                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 234                                           &regs->tstate,
 235                                           32 * sizeof(u64),
 236                                           35 * sizeof(u64));
 237         }
 238
 239         if (!ret) {
 240                 unsigned long y = regs->y;
 241
 242                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 243                                           &y,
 244                                           35 * sizeof(u64),
 245                                           36 * sizeof(u64));
 246         }
 247
 248         if (!ret) {
 249                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 250                                                36 * sizeof(u64), -1);
 251
 252         }
 253         return ret;
 254 }
 255
 256 static int genregs64_set(struct task_struct *target,
 257                          const struct user_regset *regset,
 258                          unsigned int pos, unsigned int count,
 259                          const void *kbuf, const void __user *ubuf)
 260 {
 261         struct pt_regs *regs = task_pt_regs(target);
 262         int ret;
 263
 264         if (target == current)
 265                 flushw_user();
 266
 267         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 268                                  regs->u_regs,
 269                                  0, 16 * sizeof(u64));
 270         if (!ret && count && pos < (32 * sizeof(u64))) {
 271                 struct reg_window window;
 272
 273                 if (regwindow64_get(target, regs, &window))
 274                         return -EFAULT;
 275
 276                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 277                                          &window,
 278                                          16 * sizeof(u64),
 279                                          32 * sizeof(u64));
 280
 281                 if (!ret &&
 282                     regwindow64_set(target, regs, &window))
 283                         return -EFAULT;
 284         }
 285
 286         if (!ret && count > 0) {
 287                 unsigned long tstate;
 288
 289                 /* TSTATE */
 290                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 291                                          &tstate,
 292                                          32 * sizeof(u64),
 293                                          33 * sizeof(u64));
 294                 if (!ret) {
 295                         /* Only the condition codes and the "in syscall"
 296                          * state can be modified in the %tstate register.
 297                          */
 298                         tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 299                         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 300                         regs->tstate |= tstate;
 301                 }
 302         }
 303
 304         if (!ret) {
 305                 /* TPC, TNPC */
 306                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 307                                          &regs->tpc,
 308                                          33 * sizeof(u64),
 309                                          35 * sizeof(u64));
 310         }
 311
 312         if (!ret) {
 313                 unsigned long y;
 314
 315                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 316                                          &y,
 317                                          35 * sizeof(u64),
 318                                          36 * sizeof(u64));
 319                 if (!ret)
 320                         regs->y = y;
 321         }
 322
 323         if (!ret)
 324                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 325                                                 36 * sizeof(u64), -1);
 326
 327         return ret;
 328 }
 329
 330 static int fpregs64_get(struct task_struct *target,
 331                         const struct user_regset *regset,
 332                         unsigned int pos, unsigned int count,
 333                         void *kbuf, void __user *ubuf)
 334 {
 335         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 336         unsigned long fprs, fsr, gsr;
 337         int ret;
 338
 339         if (target == current)
 340                 save_and_clear_fpu();
 341
 342         fprs = task_thread_info(target)->fpsaved[0];
 343
 344         if (fprs & FPRS_DL)
 345                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 346                                           fpregs,
 347                                           0, 16 * sizeof(u64));
 348         else
 349                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 350                                                0,
 351                                                16 * sizeof(u64));
 352
 353         if (!ret) {
 354                 if (fprs & FPRS_DU)
 355                         ret = user_regset_copyout(&pos, &count,
 356                                                   &kbuf, &ubuf,
 357                                                   fpregs + 16,
 358                                                   16 * sizeof(u64),
 359                                                   32 * sizeof(u64));
 360                 else
 361                         ret = user_regset_copyout_zero(&pos, &count,
 362                                                        &kbuf, &ubuf,
 363                                                        16 * sizeof(u64),
 364                                                        32 * sizeof(u64));
 365         }
 366
 367         if (fprs & FPRS_FEF) {
 368                 fsr = task_thread_info(target)->xfsr[0];
 369                 gsr = task_thread_info(target)->gsr[0];
 370         } else {
 371                 fsr = gsr = 0;
 372         }
 373
 374         if (!ret)
 375                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 376                                           &fsr,
 377                                           32 * sizeof(u64),
 378                                           33 * sizeof(u64));
 379         if (!ret)
 380                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 381                                           &gsr,
 382                                           33 * sizeof(u64),
 383                                           34 * sizeof(u64));
 384         if (!ret)
 385                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 386                                           &fprs,
 387                                           34 * sizeof(u64),
 388                                           35 * sizeof(u64));
 389
 390         if (!ret)
 391                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 392                                                35 * sizeof(u64), -1);
 393
 394         return ret;
 395 }
 396
 397 static int fpregs64_set(struct task_struct *target,
 398                         const struct user_regset *regset,
 399                         unsigned int pos, unsigned int count,
 400                         const void *kbuf, const void __user *ubuf)
 401 {
 402         unsigned long *fpregs = task_thread_info(target)->fpregs;
 403         unsigned long fprs;
 404         int ret;
 405
 406         if (target == current)
 407                 save_and_clear_fpu();
 408
 409         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 410                                  fpregs,
 411                                  0, 32 * sizeof(u64));
 412         if (!ret)
 413                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 414                                          task_thread_info(target)->xfsr,
 415                                          32 * sizeof(u64),
 416                                          33 * sizeof(u64));
 417         if (!ret)
 418                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 419                                          task_thread_info(target)->gsr,
 420                                          33 * sizeof(u64),
 421                                          34 * sizeof(u64));
 422
 423         fprs = task_thread_info(target)->fpsaved[0];
 424         if (!ret && count > 0) {
 425                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 426                                          &fprs,
 427                                          34 * sizeof(u64),
 428                                          35 * sizeof(u64));
 429         }
 430
 431         fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 432         task_thread_info(target)->fpsaved[0] = fprs;
 433
 434         if (!ret)
 435                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 436                                                 35 * sizeof(u64), -1);
 437         return ret;
 438 }
 439
 440 static const struct user_regset sparc64_regsets[] = {
 441         /* Format is:
 442          *      G0 --> G7
 443          *      O0 --> O7
 444          *      L0 --> L7
 445          *      I0 --> I7
 446          *      TSTATE, TPC, TNPC, Y
 447          */
 448         [REGSET_GENERAL] = {
 449                 .core_note_type = NT_PRSTATUS,
 450                 .n = 36,
 451                 .size = sizeof(u64), .align = sizeof(u64),
 452                 .get = genregs64_get, .set = genregs64_set
 453         },
 454         /* Format is:
 455          *      F0 --> F63
 456          *      FSR
 457          *      GSR
 458          *      FPRS
 459          */
 460         [REGSET_FP] = {
 461                 .core_note_type = NT_PRFPREG,
 462                 .n = 35,
 463                 .size = sizeof(u64), .align = sizeof(u64),
 464                 .get = fpregs64_get, .set = fpregs64_set
 465         },
 466 };
 467
 468 static const struct user_regset_view user_sparc64_view = {
 469         .name = "sparc64", .e_machine = EM_SPARCV9,
 470         .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
 471 };
 472
 473 #ifdef CONFIG_COMPAT
 474 static int genregs32_get(struct task_struct *target,
 475                          const struct user_regset *regset,
 476                          unsigned int pos, unsigned int count,
 477                          void *kbuf, void __user *ubuf)
 478 {
 479         const struct pt_regs *regs = task_pt_regs(target);
 480         compat_ulong_t __user *reg_window;
 481         compat_ulong_t *k = kbuf;
 482         compat_ulong_t __user *u = ubuf;
 483         compat_ulong_t reg;
 484
 485         if (target == current)
 486                 flushw_user();
 487
 488         pos /= sizeof(reg);
 489         count /= sizeof(reg);
 490
 491         if (kbuf) {
 492                 for (; count > 0 && pos < 16; count--)
 493                         *k++ = regs->u_regs[pos++];
 494
 495                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 496                 reg_window -= 16;
 497                 if (target == current) {
 498                         for (; count > 0 && pos < 32; count--) {
 499                                 if (get_user(*k++, &reg_window[pos++]))
 500                                         return -EFAULT;
 501                         }
 502                 } else {
 503                         for (; count > 0 && pos < 32; count--) {
 504                                 if (access_process_vm(target,
 505                                                       (unsigned long)
 506                                                       &reg_window[pos],
 507                                                       k, sizeof(*k), 0)
 508                                     != sizeof(*k))
 509                                         return -EFAULT;
 510                                 k++;
 511                                 pos++;
 512                         }
 513                 }
 514         } else {
 515                 for (; count > 0 && pos < 16; count--) {
 516                         if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
 517                                 return -EFAULT;
 518                 }
 519
 520                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 521                 reg_window -= 16;
 522                 if (target == current) {
 523                         for (; count > 0 && pos < 32; count--) {
 524                                 if (get_user(reg, &reg_window[pos++]) ||
 525                                     put_user(reg, u++))
 526                                         return -EFAULT;
 527                         }
 528                 } else {
 529                         for (; count > 0 && pos < 32; count--) {
 530                                 if (access_process_vm(target,
 531                                                       (unsigned long)
 532                                                       &reg_window[pos],
 533                                                       &reg, sizeof(reg), 0)
 534                                     != sizeof(reg))
 535                                         return -EFAULT;
 536                                 if (access_process_vm(target,
 537                                                       (unsigned long) u,
 538                                                       &reg, sizeof(reg), 1)
 539                                     != sizeof(reg))
 540                                         return -EFAULT;
 541                                 pos++;
 542                                 u++;
 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), 1)
 618                                     != sizeof(*k))
 619                                         return -EFAULT;
 620                                 k++;
 621                                 pos++;
 622                         }
 623                 }
 624         } else {
 625                 for (; count > 0 && pos < 16; count--) {
 626                         if (get_user(reg, u++))
 627                                 return -EFAULT;
 628                         regs->u_regs[pos++] = reg;
 629                 }
 630
 631                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 632                 reg_window -= 16;
 633                 if (target == current) {
 634                         for (; count > 0 && pos < 32; count--) {
 635                                 if (get_user(reg, u++) ||
 636                                     put_user(reg, &reg_window[pos++]))
 637                                         return -EFAULT;
 638                         }
 639                 } else {
 640                         for (; count > 0 && pos < 32; count--) {
 641                                 if (access_process_vm(target,
 642                                                       (unsigned long)
 643                                                       u,
 644                                                       &reg, sizeof(reg), 0)
 645                                     != sizeof(reg))
 646                                         return -EFAULT;
 647                                 if (access_process_vm(target,
 648                                                       (unsigned long)
 649                                                       &reg_window[pos],
 650                                                       &reg, sizeof(reg), 1)
 651                                     != sizeof(reg))
 652                                         return -EFAULT;
 653                                 pos++;
 654                                 u++;
 655                         }
 656                 }
 657         }
 658         while (count > 0) {
 659                 unsigned long tstate;
 660
 661                 if (kbuf)
 662                         reg = *k++;
 663                 else if (get_user(reg, u++))
 664                         return -EFAULT;
 665
 666                 switch (pos) {
 667                 case 32: /* PSR */
 668                         tstate = regs->tstate;
 669                         tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 670                         tstate |= psr_to_tstate_icc(reg);
 671                         if (reg & PSR_SYSCALL)
 672                                 tstate |= TSTATE_SYSCALL;
 673                         regs->tstate = tstate;
 674                         break;
 675                 case 33: /* PC */
 676                         regs->tpc = reg;
 677                         break;
 678                 case 34: /* NPC */
 679                         regs->tnpc = reg;
 680                         break;
 681                 case 35: /* Y */
 682                         regs->y = reg;
 683                         break;
 684                 case 36: /* WIM */
 685                 case 37: /* TBR */
 686                         break;
 687                 default:
 688                         goto finish;
 689                 }
 690
 691                 pos++;
 692                 count--;
 693         }
 694 finish:
 695         pos *= sizeof(reg);
 696         count *= sizeof(reg);
 697
 698         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 699                                          38 * sizeof(reg), -1);
 700 }
 701
 702 static int fpregs32_get(struct task_struct *target,
 703                         const struct user_regset *regset,
 704                         unsigned int pos, unsigned int count,
 705                         void *kbuf, void __user *ubuf)
 706 {
 707         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 708         compat_ulong_t enabled;
 709         unsigned long fprs;
 710         compat_ulong_t fsr;
 711         int ret = 0;
 712
 713         if (target == current)
 714                 save_and_clear_fpu();
 715
 716         fprs = task_thread_info(target)->fpsaved[0];
 717         if (fprs & FPRS_FEF) {
 718                 fsr = task_thread_info(target)->xfsr[0];
 719                 enabled = 1;
 720         } else {
 721                 fsr = 0;
 722                 enabled = 0;
 723         }
 724
 725         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 726                                   fpregs,
 727                                   0, 32 * sizeof(u32));
 728
 729         if (!ret)
 730                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 731                                                32 * sizeof(u32),
 732                                                33 * sizeof(u32));
 733         if (!ret)
 734                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 735                                           &fsr,
 736                                           33 * sizeof(u32),
 737                                           34 * sizeof(u32));
 738
 739         if (!ret) {
 740                 compat_ulong_t val;
 741
 742                 val = (enabled << 8) | (8 << 16);
 743                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 744                                           &val,
 745                                           34 * sizeof(u32),
 746                                           35 * sizeof(u32));
 747         }
 748
 749         if (!ret)
 750                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 751                                                35 * sizeof(u32), -1);
 752
 753         return ret;
 754 }
 755
 756 static int fpregs32_set(struct task_struct *target,
 757                         const struct user_regset *regset,
 758                         unsigned int pos, unsigned int count,
 759                         const void *kbuf, const void __user *ubuf)
 760 {
 761         unsigned long *fpregs = task_thread_info(target)->fpregs;
 762         unsigned long fprs;
 763         int ret;
 764
 765         if (target == current)
 766                 save_and_clear_fpu();
 767
 768         fprs = task_thread_info(target)->fpsaved[0];
 769
 770         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 771                                  fpregs,
 772                                  0, 32 * sizeof(u32));
 773         if (!ret)
 774                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 775                                           32 * sizeof(u32),
 776                                           33 * sizeof(u32));
 777         if (!ret && count > 0) {
 778                 compat_ulong_t fsr;
 779                 unsigned long val;
 780
 781                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 782                                          &fsr,
 783                                          33 * sizeof(u32),
 784                                          34 * sizeof(u32));
 785                 if (!ret) {
 786                         val = task_thread_info(target)->xfsr[0];
 787                         val &= 0xffffffff00000000UL;
 788                         val |= fsr;
 789                         task_thread_info(target)->xfsr[0] = val;
 790                 }
 791         }
 792
 793         fprs |= (FPRS_FEF | FPRS_DL);
 794         task_thread_info(target)->fpsaved[0] = fprs;
 795
 796         if (!ret)
 797                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 798                                                 34 * sizeof(u32), -1);
 799         return ret;
 800 }
 801
 802 static const struct user_regset sparc32_regsets[] = {
 803         /* Format is:
 804          *      G0 --> G7
 805          *      O0 --> O7
 806          *      L0 --> L7
 807          *      I0 --> I7
 808          *      PSR, PC, nPC, Y, WIM, TBR
 809          */
 810         [REGSET_GENERAL] = {
 811                 .core_note_type = NT_PRSTATUS,
 812                 .n = 38,
 813                 .size = sizeof(u32), .align = sizeof(u32),
 814                 .get = genregs32_get, .set = genregs32_set
 815         },
 816         /* Format is:
 817          *      F0 --> F31
 818          *      empty 32-bit word
 819          *      FSR (32--bit word)
 820          *      FPU QUEUE COUNT (8-bit char)
 821          *      FPU QUEUE ENTRYSIZE (8-bit char)
 822          *      FPU ENABLED (8-bit char)
 823          *      empty 8-bit char
 824          *      FPU QUEUE (64 32-bit ints)
 825          */
 826         [REGSET_FP] = {
 827                 .core_note_type = NT_PRFPREG,
 828                 .n = 99,
 829                 .size = sizeof(u32), .align = sizeof(u32),
 830                 .get = fpregs32_get, .set = fpregs32_set
 831         },
 832 };
 833
 834 static const struct user_regset_view user_sparc32_view = {
 835         .name = "sparc", .e_machine = EM_SPARC,
 836         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 837 };
 838 #endif /* CONFIG_COMPAT */
 839
 840 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 841 {
 842 #ifdef CONFIG_COMPAT
 843         if (test_tsk_thread_flag(task, TIF_32BIT))
 844                 return &user_sparc32_view;
 845 #endif
 846         return &user_sparc64_view;
 847 }
 848
 849 #ifdef CONFIG_COMPAT
 850 struct compat_fps {
 851         unsigned int regs[32];
 852         unsigned int fsr;
 853         unsigned int flags;
 854         unsigned int extra;
 855         unsigned int fpqd;
 856         struct compat_fq {
 857                 unsigned int insnaddr;
 858                 unsigned int insn;
 859         } fpq[16];
 860 };
 861
 862 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 863                         compat_ulong_t caddr, compat_ulong_t cdata)
 864 {
 865         const struct user_regset_view *view = task_user_regset_view(current);
 866         compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
 867         struct pt_regs32 __user *pregs;
 868         struct compat_fps __user *fps;
 869         unsigned long addr2 = caddr2;
 870         unsigned long addr = caddr;
 871         unsigned long data = cdata;
 872         int ret;
 873
 874         pregs = (struct pt_regs32 __user *) addr;
 875         fps = (struct compat_fps __user *) addr;
 876
 877         switch (request) {
 878         case PTRACE_PEEKUSR:
 879                 ret = (addr != 0) ? -EIO : 0;
 880                 break;
 881
 882         case PTRACE_GETREGS:
 883                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 884                                           32 * sizeof(u32),
 885                                           4 * sizeof(u32),
 886                                           &pregs->psr);
 887                 if (!ret)
 888                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 889                                                   1 * sizeof(u32),
 890                                                   15 * sizeof(u32),
 891                                                   &pregs->u_regs[0]);
 892                 break;
 893
 894         case PTRACE_SETREGS:
 895                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 896                                             32 * sizeof(u32),
 897                                             4 * sizeof(u32),
 898                                             &pregs->psr);
 899                 if (!ret)
 900                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 901                                                     1 * sizeof(u32),
 902                                                     15 * sizeof(u32),
 903                                                     &pregs->u_regs[0]);
 904                 break;
 905
 906         case PTRACE_GETFPREGS:
 907                 ret = copy_regset_to_user(child, view, REGSET_FP,
 908                                           0 * sizeof(u32),
 909                                           32 * sizeof(u32),
 910                                           &fps->regs[0]);
 911                 if (!ret)
 912                         ret = copy_regset_to_user(child, view, REGSET_FP,
 913                                                   33 * sizeof(u32),
 914                                                   1 * sizeof(u32),
 915                                                   &fps->fsr);
 916                 if (!ret) {
 917                         if (__put_user(0, &fps->flags) ||
 918                             __put_user(0, &fps->extra) ||
 919                             __put_user(0, &fps->fpqd) ||
 920                             clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
 921                                 ret = -EFAULT;
 922                 }
 923                 break;
 924
 925         case PTRACE_SETFPREGS:
 926                 ret = copy_regset_from_user(child, view, REGSET_FP,
 927                                             0 * sizeof(u32),
 928                                             32 * sizeof(u32),
 929                                             &fps->regs[0]);
 930                 if (!ret)
 931                         ret = copy_regset_from_user(child, view, REGSET_FP,
 932                                                     33 * sizeof(u32),
 933                                                     1 * sizeof(u32),
 934                                                     &fps->fsr);
 935                 break;
 936
 937         case PTRACE_READTEXT:
 938         case PTRACE_READDATA:
 939                 ret = ptrace_readdata(child, addr,
 940                                       (char __user *)addr2, data);
 941                 if (ret == data)
 942                         ret = 0;
 943                 else if (ret >= 0)
 944                         ret = -EIO;
 945                 break;
 946
 947         case PTRACE_WRITETEXT:
 948         case PTRACE_WRITEDATA:
 949                 ret = ptrace_writedata(child, (char __user *) addr2,
 950                                        addr, data);
 951                 if (ret == data)
 952                         ret = 0;
 953                 else if (ret >= 0)
 954                         ret = -EIO;
 955                 break;
 956
 957         default:
 958                 if (request == PTRACE_SPARC_DETACH)
 959                         request = PTRACE_DETACH;
 960                 ret = compat_ptrace_request(child, request, addr, data);
 961                 break;
 962         }
 963
 964         return ret;
 965 }
 966 #endif /* CONFIG_COMPAT */
 967
 968 struct fps {
 969         unsigned int regs[64];
 970         unsigned long fsr;
 971 };
 972
 973 long arch_ptrace(struct task_struct *child, long request,
 974                  unsigned long addr, unsigned long data)
 975 {
 976         const struct user_regset_view *view = task_user_regset_view(current);
 977         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
 978         struct pt_regs __user *pregs;
 979         struct fps __user *fps;
 980         void __user *addr2p;
 981         int ret;
 982
 983         pregs = (struct pt_regs __user *) addr;
 984         fps = (struct fps __user *) addr;
 985         addr2p = (void __user *) addr2;
 986
 987         switch (request) {
 988         case PTRACE_PEEKUSR:
 989                 ret = (addr != 0) ? -EIO : 0;
 990                 break;
 991
 992         case PTRACE_GETREGS64:
 993                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 994                                           1 * sizeof(u64),
 995                                           15 * sizeof(u64),
 996                                           &pregs->u_regs[0]);
 997                 if (!ret) {
 998                         /* XXX doesn't handle 'y' register correctly XXX */
 999                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1000                                                   32 * sizeof(u64),
1001                                                   4 * sizeof(u64),
1002                                                   &pregs->tstate);
1003                 }
1004                 break;
1005
1006         case PTRACE_SETREGS64:
1007                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1008                                             1 * sizeof(u64),
1009                                             15 * sizeof(u64),
1010                                             &pregs->u_regs[0]);
1011                 if (!ret) {
1012                         /* XXX doesn't handle 'y' register correctly XXX */
1013                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1014                                                     32 * sizeof(u64),
1015                                                     4 * sizeof(u64),
1016                                                     &pregs->tstate);
1017                 }
1018                 break;
1019
1020         case PTRACE_GETFPREGS64:
1021                 ret = copy_regset_to_user(child, view, REGSET_FP,
1022                                           0 * sizeof(u64),
1023                                           33 * sizeof(u64),
1024                                           fps);
1025                 break;
1026
1027         case PTRACE_SETFPREGS64:
1028                 ret = copy_regset_from_user(child, view, REGSET_FP,
1029                                           0 * sizeof(u64),
1030                                           33 * sizeof(u64),
1031                                           fps);
1032                 break;
1033
1034         case PTRACE_READTEXT:
1035         case PTRACE_READDATA:
1036                 ret = ptrace_readdata(child, addr, addr2p, data);
1037                 if (ret == data)
1038                         ret = 0;
1039                 else if (ret >= 0)
1040                         ret = -EIO;
1041                 break;
1042
1043         case PTRACE_WRITETEXT:
1044         case PTRACE_WRITEDATA:
1045                 ret = ptrace_writedata(child, addr2p, addr, data);
1046                 if (ret == data)
1047                         ret = 0;
1048                 else if (ret >= 0)
1049                         ret = -EIO;
1050                 break;
1051
1052         default:
1053                 if (request == PTRACE_SPARC_DETACH)
1054                         request = PTRACE_DETACH;
1055                 ret = ptrace_request(child, request, addr, data);
1056                 break;
1057         }
1058
1059         return ret;
1060 }
1061
1062 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1063 {
1064         int ret = 0;
1065
1066         /* do the secure computing check first */
1067         secure_computing_strict(regs->u_regs[UREG_G1]);
1068
1069         if (test_thread_flag(TIF_SYSCALL_TRACE))
1070                 ret = tracehook_report_syscall_entry(regs);
1071
1072         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1073                 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1074
1075         audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
1076                              AUDIT_ARCH_SPARC :
1077                              AUDIT_ARCH_SPARC64),
1078                             regs->u_regs[UREG_G1],
1079                             regs->u_regs[UREG_I0],
1080                             regs->u_regs[UREG_I1],
1081                             regs->u_regs[UREG_I2],
1082                             regs->u_regs[UREG_I3]);
1083
1084         return ret;
1085 }
1086
1087 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1088 {
1089         audit_syscall_exit(regs);
1090
1091         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1092                 trace_sys_exit(regs, regs->u_regs[UREG_I0]);
1093
1094         if (test_thread_flag(TIF_SYSCALL_TRACE))
1095                 tracehook_report_syscall_exit(regs, 0);
1096 }