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/ptrace.h>
  18 #include <linux/user.h>
  19 #include <linux/smp.h>
  20 #include <linux/security.h>
  21 #include <linux/seccomp.h>
  22 #include <linux/audit.h>
  23 #include <linux/signal.h>
  24 #include <linux/regset.h>
  25 #include <linux/tracehook.h>
  26 #include <trace/syscall.h>
  27 #include <linux/compat.h>
  28 #include <linux/elf.h>
  29
  30 #include <asm/asi.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/system.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
 121 static int get_from_target(struct task_struct *target, unsigned long uaddr,
 122                            void *kbuf, int len)
 123 {
 124         if (target == current) {
 125                 if (copy_from_user(kbuf, (void __user *) uaddr, len))
 126                         return -EFAULT;
 127         } else {
 128                 int len2 = access_process_vm(target, uaddr, kbuf, len, 0);
 129                 if (len2 != len)
 130                         return -EFAULT;
 131         }
 132         return 0;
 133 }
 134
 135 static int set_to_target(struct task_struct *target, unsigned long uaddr,
 136                          void *kbuf, int len)
 137 {
 138         if (target == current) {
 139                 if (copy_to_user((void __user *) uaddr, kbuf, len))
 140                         return -EFAULT;
 141         } else {
 142                 int len2 = access_process_vm(target, uaddr, kbuf, len, 1);
 143                 if (len2 != len)
 144                         return -EFAULT;
 145         }
 146         return 0;
 147 }
 148
 149 static int regwindow64_get(struct task_struct *target,
 150                            const struct pt_regs *regs,
 151                            struct reg_window *wbuf)
 152 {
 153         unsigned long rw_addr = regs->u_regs[UREG_I6];
 154
 155         if (test_tsk_thread_flag(current, TIF_32BIT)) {
 156                 struct reg_window32 win32;
 157                 int i;
 158
 159                 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
 160                         return -EFAULT;
 161                 for (i = 0; i < 8; i++)
 162                         wbuf->locals[i] = win32.locals[i];
 163                 for (i = 0; i < 8; i++)
 164                         wbuf->ins[i] = win32.ins[i];
 165         } else {
 166                 rw_addr += STACK_BIAS;
 167                 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 168                         return -EFAULT;
 169         }
 170
 171         return 0;
 172 }
 173
 174 static int regwindow64_set(struct task_struct *target,
 175                            const struct pt_regs *regs,
 176                            struct reg_window *wbuf)
 177 {
 178         unsigned long rw_addr = regs->u_regs[UREG_I6];
 179
 180         if (test_tsk_thread_flag(current, TIF_32BIT)) {
 181                 struct reg_window32 win32;
 182                 int i;
 183
 184                 for (i = 0; i < 8; i++)
 185                         win32.locals[i] = wbuf->locals[i];
 186                 for (i = 0; i < 8; i++)
 187                         win32.ins[i] = wbuf->ins[i];
 188
 189                 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
 190                         return -EFAULT;
 191         } else {
 192                 rw_addr += STACK_BIAS;
 193                 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 194                         return -EFAULT;
 195         }
 196
 197         return 0;
 198 }
 199
 200 enum sparc_regset {
 201         REGSET_GENERAL,
 202         REGSET_FP,
 203 };
 204
 205 static int genregs64_get(struct task_struct *target,
 206                          const struct user_regset *regset,
 207                          unsigned int pos, unsigned int count,
 208                          void *kbuf, void __user *ubuf)
 209 {
 210         const struct pt_regs *regs = task_pt_regs(target);
 211         int ret;
 212
 213         if (target == current)
 214                 flushw_user();
 215
 216         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 217                                   regs->u_regs,
 218                                   0, 16 * sizeof(u64));
 219         if (!ret && count && pos < (32 * sizeof(u64))) {
 220                 struct reg_window window;
 221
 222                 if (regwindow64_get(target, regs, &window))
 223                         return -EFAULT;
 224                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 225                                           &window,
 226                                           16 * sizeof(u64),
 227                                           32 * sizeof(u64));
 228         }
 229
 230         if (!ret) {
 231                 /* TSTATE, TPC, TNPC */
 232                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 233                                           &regs->tstate,
 234                                           32 * sizeof(u64),
 235                                           35 * sizeof(u64));
 236         }
 237
 238         if (!ret) {
 239                 unsigned long y = regs->y;
 240
 241                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 242                                           &y,
 243                                           35 * sizeof(u64),
 244                                           36 * sizeof(u64));
 245         }
 246
 247         if (!ret) {
 248                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 249                                                36 * sizeof(u64), -1);
 250
 251         }
 252         return ret;
 253 }
 254
 255 static int genregs64_set(struct task_struct *target,
 256                          const struct user_regset *regset,
 257                          unsigned int pos, unsigned int count,
 258                          const void *kbuf, const void __user *ubuf)
 259 {
 260         struct pt_regs *regs = task_pt_regs(target);
 261         int ret;
 262
 263         if (target == current)
 264                 flushw_user();
 265
 266         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 267                                  regs->u_regs,
 268                                  0, 16 * sizeof(u64));
 269         if (!ret && count && pos < (32 * sizeof(u64))) {
 270                 struct reg_window window;
 271
 272                 if (regwindow64_get(target, regs, &window))
 273                         return -EFAULT;
 274
 275                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 276                                          &window,
 277                                          16 * sizeof(u64),
 278                                          32 * sizeof(u64));
 279
 280                 if (!ret &&
 281                     regwindow64_set(target, regs, &window))
 282                         return -EFAULT;
 283         }
 284
 285         if (!ret && count > 0) {
 286                 unsigned long tstate;
 287
 288                 /* TSTATE */
 289                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 290                                          &tstate,
 291                                          32 * sizeof(u64),
 292                                          33 * sizeof(u64));
 293                 if (!ret) {
 294                         /* Only the condition codes and the "in syscall"
 295                          * state can be modified in the %tstate register.
 296                          */
 297                         tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 298                         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 299                         regs->tstate |= tstate;
 300                 }
 301         }
 302
 303         if (!ret) {
 304                 /* TPC, TNPC */
 305                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 306                                          &regs->tpc,
 307                                          33 * sizeof(u64),
 308                                          35 * sizeof(u64));
 309         }
 310
 311         if (!ret) {
 312                 unsigned long y;
 313
 314                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 315                                          &y,
 316                                          35 * sizeof(u64),
 317                                          36 * sizeof(u64));
 318                 if (!ret)
 319                         regs->y = y;
 320         }
 321
 322         if (!ret)
 323                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 324                                                 36 * sizeof(u64), -1);
 325
 326         return ret;
 327 }
 328
 329 static int fpregs64_get(struct task_struct *target,
 330                         const struct user_regset *regset,
 331                         unsigned int pos, unsigned int count,
 332                         void *kbuf, void __user *ubuf)
 333 {
 334         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 335         unsigned long fprs, fsr, gsr;
 336         int ret;
 337
 338         if (target == current)
 339                 save_and_clear_fpu();
 340
 341         fprs = task_thread_info(target)->fpsaved[0];
 342
 343         if (fprs & FPRS_DL)
 344                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 345                                           fpregs,
 346                                           0, 16 * sizeof(u64));
 347         else
 348                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 349                                                0,
 350                                                16 * sizeof(u64));
 351
 352         if (!ret) {
 353                 if (fprs & FPRS_DU)
 354                         ret = user_regset_copyout(&pos, &count,
 355                                                   &kbuf, &ubuf,
 356                                                   fpregs + 16,
 357                                                   16 * sizeof(u64),
 358                                                   32 * sizeof(u64));
 359                 else
 360                         ret = user_regset_copyout_zero(&pos, &count,
 361                                                        &kbuf, &ubuf,
 362                                                        16 * sizeof(u64),
 363                                                        32 * sizeof(u64));
 364         }
 365
 366         if (fprs & FPRS_FEF) {
 367                 fsr = task_thread_info(target)->xfsr[0];
 368                 gsr = task_thread_info(target)->gsr[0];
 369         } else {
 370                 fsr = gsr = 0;
 371         }
 372
 373         if (!ret)
 374                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 375                                           &fsr,
 376                                           32 * sizeof(u64),
 377                                           33 * sizeof(u64));
 378         if (!ret)
 379                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 380                                           &gsr,
 381                                           33 * sizeof(u64),
 382                                           34 * sizeof(u64));
 383         if (!ret)
 384                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 385                                           &fprs,
 386                                           34 * sizeof(u64),
 387                                           35 * sizeof(u64));
 388
 389         if (!ret)
 390                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 391                                                35 * sizeof(u64), -1);
 392
 393         return ret;
 394 }
 395
 396 static int fpregs64_set(struct task_struct *target,
 397                         const struct user_regset *regset,
 398                         unsigned int pos, unsigned int count,
 399                         const void *kbuf, const void __user *ubuf)
 400 {
 401         unsigned long *fpregs = task_thread_info(target)->fpregs;
 402         unsigned long fprs;
 403         int ret;
 404
 405         if (target == current)
 406                 save_and_clear_fpu();
 407
 408         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 409                                  fpregs,
 410                                  0, 32 * sizeof(u64));
 411         if (!ret)
 412                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 413                                          task_thread_info(target)->xfsr,
 414                                          32 * sizeof(u64),
 415                                          33 * sizeof(u64));
 416         if (!ret)
 417                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 418                                          task_thread_info(target)->gsr,
 419                                          33 * sizeof(u64),
 420                                          34 * sizeof(u64));
 421
 422         fprs = task_thread_info(target)->fpsaved[0];
 423         if (!ret && count > 0) {
 424                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 425                                          &fprs,
 426                                          34 * sizeof(u64),
 427                                          35 * sizeof(u64));
 428         }
 429
 430         fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 431         task_thread_info(target)->fpsaved[0] = fprs;
 432
 433         if (!ret)
 434                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 435                                                 35 * sizeof(u64), -1);
 436         return ret;
 437 }
 438
 439 static const struct user_regset sparc64_regsets[] = {
 440         /* Format is:
 441          *      G0 --> G7
 442          *      O0 --> O7
 443          *      L0 --> L7
 444          *      I0 --> I7
 445          *      TSTATE, TPC, TNPC, Y
 446          */
 447         [REGSET_GENERAL] = {
 448                 .core_note_type = NT_PRSTATUS,
 449                 .n = 36,
 450                 .size = sizeof(u64), .align = sizeof(u64),
 451                 .get = genregs64_get, .set = genregs64_set
 452         },
 453         /* Format is:
 454          *      F0 --> F63
 455          *      FSR
 456          *      GSR
 457          *      FPRS
 458          */
 459         [REGSET_FP] = {
 460                 .core_note_type = NT_PRFPREG,
 461                 .n = 35,
 462                 .size = sizeof(u64), .align = sizeof(u64),
 463                 .get = fpregs64_get, .set = fpregs64_set
 464         },
 465 };
 466
 467 static const struct user_regset_view user_sparc64_view = {
 468         .name = "sparc64", .e_machine = EM_SPARCV9,
 469         .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
 470 };
 471
 472 #ifdef CONFIG_COMPAT
 473 static int genregs32_get(struct task_struct *target,
 474                          const struct user_regset *regset,
 475                          unsigned int pos, unsigned int count,
 476                          void *kbuf, void __user *ubuf)
 477 {
 478         const struct pt_regs *regs = task_pt_regs(target);
 479         compat_ulong_t __user *reg_window;
 480         compat_ulong_t *k = kbuf;
 481         compat_ulong_t __user *u = ubuf;
 482         compat_ulong_t reg;
 483
 484         if (target == current)
 485                 flushw_user();
 486
 487         pos /= sizeof(reg);
 488         count /= sizeof(reg);
 489
 490         if (kbuf) {
 491                 for (; count > 0 && pos < 16; count--)
 492                         *k++ = regs->u_regs[pos++];
 493
 494                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 495                 reg_window -= 16;
 496                 if (target == current) {
 497                         for (; count > 0 && pos < 32; count--) {
 498                                 if (get_user(*k++, &reg_window[pos++]))
 499                                         return -EFAULT;
 500                         }
 501                 } else {
 502                         for (; count > 0 && pos < 32; count--) {
 503                                 if (access_process_vm(target,
 504                                                       (unsigned long)
 505                                                       &reg_window[pos],
 506                                                       k, sizeof(*k), 0)
 507                                     != sizeof(*k))
 508                                         return -EFAULT;
 509                                 k++;
 510                                 pos++;
 511                         }
 512                 }
 513         } else {
 514                 for (; count > 0 && pos < 16; count--) {
 515                         if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
 516                                 return -EFAULT;
 517                 }
 518
 519                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 520                 reg_window -= 16;
 521                 if (target == current) {
 522                         for (; count > 0 && pos < 32; count--) {
 523                                 if (get_user(reg, &reg_window[pos++]) ||
 524                                     put_user(reg, u++))
 525                                         return -EFAULT;
 526                         }
 527                 } else {
 528                         for (; count > 0 && pos < 32; count--) {
 529                                 if (access_process_vm(target,
 530                                                       (unsigned long)
 531                                                       &reg_window[pos],
 532                                                       &reg, sizeof(reg), 0)
 533                                     != sizeof(reg))
 534                                         return -EFAULT;
 535                                 if (access_process_vm(target,
 536                                                       (unsigned long) u,
 537                                                       &reg, sizeof(reg), 1)
 538                                     != sizeof(reg))
 539                                         return -EFAULT;
 540                                 pos++;
 541                                 u++;
 542                         }
 543                 }
 544         }
 545         while (count > 0) {
 546                 switch (pos) {
 547                 case 32: /* PSR */
 548                         reg = tstate_to_psr(regs->tstate);
 549                         break;
 550                 case 33: /* PC */
 551                         reg = regs->tpc;
 552                         break;
 553                 case 34: /* NPC */
 554                         reg = regs->tnpc;
 555                         break;
 556                 case 35: /* Y */
 557                         reg = regs->y;
 558                         break;
 559                 case 36: /* WIM */
 560                 case 37: /* TBR */
 561                         reg = 0;
 562                         break;
 563                 default:
 564                         goto finish;
 565                 }
 566
 567                 if (kbuf)
 568                         *k++ = reg;
 569                 else if (put_user(reg, u++))
 570                         return -EFAULT;
 571                 pos++;
 572                 count--;
 573         }
 574 finish:
 575         pos *= sizeof(reg);
 576         count *= sizeof(reg);
 577
 578         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 579                                         38 * sizeof(reg), -1);
 580 }
 581
 582 static int genregs32_set(struct task_struct *target,
 583                          const struct user_regset *regset,
 584                          unsigned int pos, unsigned int count,
 585                          const void *kbuf, const void __user *ubuf)
 586 {
 587         struct pt_regs *regs = task_pt_regs(target);
 588         compat_ulong_t __user *reg_window;
 589         const compat_ulong_t *k = kbuf;
 590         const compat_ulong_t __user *u = ubuf;
 591         compat_ulong_t reg;
 592
 593         if (target == current)
 594                 flushw_user();
 595
 596         pos /= sizeof(reg);
 597         count /= sizeof(reg);
 598
 599         if (kbuf) {
 600                 for (; count > 0 && pos < 16; count--)
 601                         regs->u_regs[pos++] = *k++;
 602
 603                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 604                 reg_window -= 16;
 605                 if (target == current) {
 606                         for (; count > 0 && pos < 32; count--) {
 607                                 if (put_user(*k++, &reg_window[pos++]))
 608                                         return -EFAULT;
 609                         }
 610                 } else {
 611                         for (; count > 0 && pos < 32; count--) {
 612                                 if (access_process_vm(target,
 613                                                       (unsigned long)
 614                                                       &reg_window[pos],
 615                                                       (void *) k,
 616                                                       sizeof(*k), 1)
 617                                     != sizeof(*k))
 618                                         return -EFAULT;
 619                                 k++;
 620                                 pos++;
 621                         }
 622                 }
 623         } else {
 624                 for (; count > 0 && pos < 16; count--) {
 625                         if (get_user(reg, u++))
 626                                 return -EFAULT;
 627                         regs->u_regs[pos++] = reg;
 628                 }
 629
 630                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 631                 reg_window -= 16;
 632                 if (target == current) {
 633                         for (; count > 0 && pos < 32; count--) {
 634                                 if (get_user(reg, u++) ||
 635                                     put_user(reg, &reg_window[pos++]))
 636                                         return -EFAULT;
 637                         }
 638                 } else {
 639                         for (; count > 0 && pos < 32; count--) {
 640                                 if (access_process_vm(target,
 641                                                       (unsigned long)
 642                                                       u,
 643                                                       &reg, sizeof(reg), 0)
 644                                     != sizeof(reg))
 645                                         return -EFAULT;
 646                                 if (access_process_vm(target,
 647                                                       (unsigned long)
 648                                                       &reg_window[pos],
 649                                                       &reg, sizeof(reg), 1)
 650                                     != sizeof(reg))
 651                                         return -EFAULT;
 652                                 pos++;
 653                                 u++;
 654                         }
 655                 }
 656         }
 657         while (count > 0) {
 658                 unsigned long tstate;
 659
 660                 if (kbuf)
 661                         reg = *k++;
 662                 else if (get_user(reg, u++))
 663                         return -EFAULT;
 664
 665                 switch (pos) {
 666                 case 32: /* PSR */
 667                         tstate = regs->tstate;
 668                         tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 669                         tstate |= psr_to_tstate_icc(reg);
 670                         if (reg & PSR_SYSCALL)
 671                                 tstate |= TSTATE_SYSCALL;
 672                         regs->tstate = tstate;
 673                         break;
 674                 case 33: /* PC */
 675                         regs->tpc = reg;
 676                         break;
 677                 case 34: /* NPC */
 678                         regs->tnpc = reg;
 679                         break;
 680                 case 35: /* Y */
 681                         regs->y = reg;
 682                         break;
 683                 case 36: /* WIM */
 684                 case 37: /* TBR */
 685                         break;
 686                 default:
 687                         goto finish;
 688                 }
 689
 690                 pos++;
 691                 count--;
 692         }
 693 finish:
 694         pos *= sizeof(reg);
 695         count *= sizeof(reg);
 696
 697         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 698                                          38 * sizeof(reg), -1);
 699 }
 700
 701 static int fpregs32_get(struct task_struct *target,
 702                         const struct user_regset *regset,
 703                         unsigned int pos, unsigned int count,
 704                         void *kbuf, void __user *ubuf)
 705 {
 706         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 707         compat_ulong_t enabled;
 708         unsigned long fprs;
 709         compat_ulong_t fsr;
 710         int ret = 0;
 711
 712         if (target == current)
 713                 save_and_clear_fpu();
 714
 715         fprs = task_thread_info(target)->fpsaved[0];
 716         if (fprs & FPRS_FEF) {
 717                 fsr = task_thread_info(target)->xfsr[0];
 718                 enabled = 1;
 719         } else {
 720                 fsr = 0;
 721                 enabled = 0;
 722         }
 723
 724         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 725                                   fpregs,
 726                                   0, 32 * sizeof(u32));
 727
 728         if (!ret)
 729                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 730                                                32 * sizeof(u32),
 731                                                33 * sizeof(u32));
 732         if (!ret)
 733                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 734                                           &fsr,
 735                                           33 * sizeof(u32),
 736                                           34 * sizeof(u32));
 737
 738         if (!ret) {
 739                 compat_ulong_t val;
 740
 741                 val = (enabled << 8) | (8 << 16);
 742                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 743                                           &val,
 744                                           34 * sizeof(u32),
 745                                           35 * sizeof(u32));
 746         }
 747
 748         if (!ret)
 749                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 750                                                35 * sizeof(u32), -1);
 751
 752         return ret;
 753 }
 754
 755 static int fpregs32_set(struct task_struct *target,
 756                         const struct user_regset *regset,
 757                         unsigned int pos, unsigned int count,
 758                         const void *kbuf, const void __user *ubuf)
 759 {
 760         unsigned long *fpregs = task_thread_info(target)->fpregs;
 761         unsigned long fprs;
 762         int ret;
 763
 764         if (target == current)
 765                 save_and_clear_fpu();
 766
 767         fprs = task_thread_info(target)->fpsaved[0];
 768
 769         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 770                                  fpregs,
 771                                  0, 32 * sizeof(u32));
 772         if (!ret)
 773                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 774                                           32 * sizeof(u32),
 775                                           33 * sizeof(u32));
 776         if (!ret && count > 0) {
 777                 compat_ulong_t fsr;
 778                 unsigned long val;
 779
 780                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 781                                          &fsr,
 782                                          33 * sizeof(u32),
 783                                          34 * sizeof(u32));
 784                 if (!ret) {
 785                         val = task_thread_info(target)->xfsr[0];
 786                         val &= 0xffffffff00000000UL;
 787                         val |= fsr;
 788                         task_thread_info(target)->xfsr[0] = val;
 789                 }
 790         }
 791
 792         fprs |= (FPRS_FEF | FPRS_DL);
 793         task_thread_info(target)->fpsaved[0] = fprs;
 794
 795         if (!ret)
 796                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 797                                                 34 * sizeof(u32), -1);
 798         return ret;
 799 }
 800
 801 static const struct user_regset sparc32_regsets[] = {
 802         /* Format is:
 803          *      G0 --> G7
 804          *      O0 --> O7
 805          *      L0 --> L7
 806          *      I0 --> I7
 807          *      PSR, PC, nPC, Y, WIM, TBR
 808          */
 809         [REGSET_GENERAL] = {
 810                 .core_note_type = NT_PRSTATUS,
 811                 .n = 38,
 812                 .size = sizeof(u32), .align = sizeof(u32),
 813                 .get = genregs32_get, .set = genregs32_set
 814         },
 815         /* Format is:
 816          *      F0 --> F31
 817          *      empty 32-bit word
 818          *      FSR (32--bit word)
 819          *      FPU QUEUE COUNT (8-bit char)
 820          *      FPU QUEUE ENTRYSIZE (8-bit char)
 821          *      FPU ENABLED (8-bit char)
 822          *      empty 8-bit char
 823          *      FPU QUEUE (64 32-bit ints)
 824          */
 825         [REGSET_FP] = {
 826                 .core_note_type = NT_PRFPREG,
 827                 .n = 99,
 828                 .size = sizeof(u32), .align = sizeof(u32),
 829                 .get = fpregs32_get, .set = fpregs32_set
 830         },
 831 };
 832
 833 static const struct user_regset_view user_sparc32_view = {
 834         .name = "sparc", .e_machine = EM_SPARC,
 835         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 836 };
 837 #endif /* CONFIG_COMPAT */
 838
 839 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 840 {
 841 #ifdef CONFIG_COMPAT
 842         if (test_tsk_thread_flag(task, TIF_32BIT))
 843                 return &user_sparc32_view;
 844 #endif
 845         return &user_sparc64_view;
 846 }
 847
 848 #ifdef CONFIG_COMPAT
 849 struct compat_fps {
 850         unsigned int regs[32];
 851         unsigned int fsr;
 852         unsigned int flags;
 853         unsigned int extra;
 854         unsigned int fpqd;
 855         struct compat_fq {
 856                 unsigned int insnaddr;
 857                 unsigned int insn;
 858         } fpq[16];
 859 };
 860
 861 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 862                         compat_ulong_t caddr, compat_ulong_t cdata)
 863 {
 864         const struct user_regset_view *view = task_user_regset_view(current);
 865         compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
 866         struct pt_regs32 __user *pregs;
 867         struct compat_fps __user *fps;
 868         unsigned long addr2 = caddr2;
 869         unsigned long addr = caddr;
 870         unsigned long data = cdata;
 871         int ret;
 872
 873         pregs = (struct pt_regs32 __user *) addr;
 874         fps = (struct compat_fps __user *) addr;
 875
 876         switch (request) {
 877         case PTRACE_PEEKUSR:
 878                 ret = (addr != 0) ? -EIO : 0;
 879                 break;
 880
 881         case PTRACE_GETREGS:
 882                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 883                                           32 * sizeof(u32),
 884                                           4 * sizeof(u32),
 885                                           &pregs->psr);
 886                 if (!ret)
 887                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 888                                                   1 * sizeof(u32),
 889                                                   15 * sizeof(u32),
 890                                                   &pregs->u_regs[0]);
 891                 break;
 892
 893         case PTRACE_SETREGS:
 894                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 895                                             32 * sizeof(u32),
 896                                             4 * sizeof(u32),
 897                                             &pregs->psr);
 898                 if (!ret)
 899                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 900                                                     1 * sizeof(u32),
 901                                                     15 * sizeof(u32),
 902                                                     &pregs->u_regs[0]);
 903                 break;
 904
 905         case PTRACE_GETFPREGS:
 906                 ret = copy_regset_to_user(child, view, REGSET_FP,
 907                                           0 * sizeof(u32),
 908                                           32 * sizeof(u32),
 909                                           &fps->regs[0]);
 910                 if (!ret)
 911                         ret = copy_regset_to_user(child, view, REGSET_FP,
 912                                                   33 * sizeof(u32),
 913                                                   1 * sizeof(u32),
 914                                                   &fps->fsr);
 915                 if (!ret) {
 916                         if (__put_user(0, &fps->flags) ||
 917                             __put_user(0, &fps->extra) ||
 918                             __put_user(0, &fps->fpqd) ||
 919                             clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
 920                                 ret = -EFAULT;
 921                 }
 922                 break;
 923
 924         case PTRACE_SETFPREGS:
 925                 ret = copy_regset_from_user(child, view, REGSET_FP,
 926                                             0 * sizeof(u32),
 927                                             32 * sizeof(u32),
 928                                             &fps->regs[0]);
 929                 if (!ret)
 930                         ret = copy_regset_from_user(child, view, REGSET_FP,
 931                                                     33 * sizeof(u32),
 932                                                     1 * sizeof(u32),
 933                                                     &fps->fsr);
 934                 break;
 935
 936         case PTRACE_READTEXT:
 937         case PTRACE_READDATA:
 938                 ret = ptrace_readdata(child, addr,
 939                                       (char __user *)addr2, data);
 940                 if (ret == data)
 941                         ret = 0;
 942                 else if (ret >= 0)
 943                         ret = -EIO;
 944                 break;
 945
 946         case PTRACE_WRITETEXT:
 947         case PTRACE_WRITEDATA:
 948                 ret = ptrace_writedata(child, (char __user *) addr2,
 949                                        addr, data);
 950                 if (ret == data)
 951                         ret = 0;
 952                 else if (ret >= 0)
 953                         ret = -EIO;
 954                 break;
 955
 956         default:
 957                 if (request == PTRACE_SPARC_DETACH)
 958                         request = PTRACE_DETACH;
 959                 ret = compat_ptrace_request(child, request, addr, data);
 960                 break;
 961         }
 962
 963         return ret;
 964 }
 965 #endif /* CONFIG_COMPAT */
 966
 967 struct fps {
 968         unsigned int regs[64];
 969         unsigned long fsr;
 970 };
 971
 972 long arch_ptrace(struct task_struct *child, long request,
 973                  unsigned long addr, unsigned long data)
 974 {
 975         const struct user_regset_view *view = task_user_regset_view(current);
 976         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
 977         struct pt_regs __user *pregs;
 978         struct fps __user *fps;
 979         int ret;
 980
 981         pregs = (struct pt_regs __user *) addr;
 982         fps = (struct fps __user *) addr;
 983
 984         switch (request) {
 985         case PTRACE_PEEKUSR:
 986                 ret = (addr != 0) ? -EIO : 0;
 987                 break;
 988
 989         case PTRACE_GETREGS64:
 990                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 991                                           1 * sizeof(u64),
 992                                           15 * sizeof(u64),
 993                                           &pregs->u_regs[0]);
 994                 if (!ret) {
 995                         /* XXX doesn't handle 'y' register correctly XXX */
 996                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 997                                                   32 * sizeof(u64),
 998                                                   4 * sizeof(u64),
 999                                                   &pregs->tstate);
1000                 }
1001                 break;
1002
1003         case PTRACE_SETREGS64:
1004                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1005                                             1 * sizeof(u64),
1006                                             15 * sizeof(u64),
1007                                             &pregs->u_regs[0]);
1008                 if (!ret) {
1009                         /* XXX doesn't handle 'y' register correctly XXX */
1010                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1011                                                     32 * sizeof(u64),
1012                                                     4 * sizeof(u64),
1013                                                     &pregs->tstate);
1014                 }
1015                 break;
1016
1017         case PTRACE_GETFPREGS64:
1018                 ret = copy_regset_to_user(child, view, REGSET_FP,
1019                                           0 * sizeof(u64),
1020                                           33 * sizeof(u64),
1021                                           fps);
1022                 break;
1023
1024         case PTRACE_SETFPREGS64:
1025                 ret = copy_regset_from_user(child, view, REGSET_FP,
1026                                           0 * sizeof(u64),
1027                                           33 * sizeof(u64),
1028                                           fps);
1029                 break;
1030
1031         case PTRACE_READTEXT:
1032         case PTRACE_READDATA:
1033                 ret = ptrace_readdata(child, addr,
1034                                       (char __user *)addr2, 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, (char __user *) addr2,
1044                                        addr, data);
1045                 if (ret == data)
1046                         ret = 0;
1047                 else if (ret >= 0)
1048                         ret = -EIO;
1049                 break;
1050
1051         default:
1052                 if (request == PTRACE_SPARC_DETACH)
1053                         request = PTRACE_DETACH;
1054                 ret = ptrace_request(child, request, addr, data);
1055                 break;
1056         }
1057
1058         return ret;
1059 }
1060
1061 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1062 {
1063         int ret = 0;
1064
1065         /* do the secure computing check first */
1066         secure_computing(regs->u_regs[UREG_G1]);
1067
1068         if (test_thread_flag(TIF_SYSCALL_TRACE))
1069                 ret = tracehook_report_syscall_entry(regs);
1070
1071         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1072                 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1073
1074         if (unlikely(current->audit_context) && !ret)
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         if (unlikely(current->audit_context)) {
1090                 unsigned long tstate = regs->tstate;
1091                 int result = AUDITSC_SUCCESS;
1092
1093                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
1094                         result = AUDITSC_FAILURE;
1095
1096                 audit_syscall_exit(result, regs->u_regs[UREG_I0]);
1097         }
1098
1099         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1100                 trace_sys_exit(regs, regs->u_regs[UREG_G1]);
1101
1102         if (test_thread_flag(TIF_SYSCALL_TRACE))
1103                 tracehook_report_syscall_exit(regs, 0);
1104 }