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/uaccess.h>
  33 #include <asm/psrcompat.h>
  34 #include <asm/visasm.h>
  35 #include <asm/spitfire.h>
  36 #include <asm/page.h>
  37 #include <asm/cpudata.h>
  38 #include <asm/cacheflush.h>
  39
  40 #define CREATE_TRACE_POINTS
  41 #include <trace/events/syscalls.h>
  42
  43 #include "entry.h"
  44
  45 /* #define ALLOW_INIT_TRACING */
  46
  47 /*
  48  * Called by kernel/ptrace.c when detaching..
  49  *
  50  * Make sure single step bits etc are not set.
  51  */
  52 void ptrace_disable(struct task_struct *child)
  53 {
  54         /* nothing to do */
  55 }
  56
  57 /* To get the necessary page struct, access_process_vm() first calls
  58  * get_user_pages().  This has done a flush_dcache_page() on the
  59  * accessed page.  Then our caller (copy_{to,from}_user_page()) did
  60  * to memcpy to read/write the data from that page.
  61  *
  62  * Now, the only thing we have to do is:
  63  * 1) flush the D-cache if it's possible than an illegal alias
  64  *    has been created
  65  * 2) flush the I-cache if this is pre-cheetah and we did a write
  66  */
  67 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
  68                          unsigned long uaddr, void *kaddr,
  69                          unsigned long len, int write)
  70 {
  71         BUG_ON(len > PAGE_SIZE);
  72
  73         if (tlb_type == hypervisor)
  74                 return;
  75
  76         preempt_disable();
  77
  78 #ifdef DCACHE_ALIASING_POSSIBLE
  79         /* If bit 13 of the kernel address we used to access the
  80          * user page is the same as the virtual address that page
  81          * is mapped to in the user's address space, we can skip the
  82          * D-cache flush.
  83          */
  84         if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
  85                 unsigned long start = __pa(kaddr);
  86                 unsigned long end = start + len;
  87                 unsigned long dcache_line_size;
  88
  89                 dcache_line_size = local_cpu_data().dcache_line_size;
  90
  91                 if (tlb_type == spitfire) {
  92                         for (; start < end; start += dcache_line_size)
  93                                 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
  94                 } else {
  95                         start &= ~(dcache_line_size - 1);
  96                         for (; start < end; start += dcache_line_size)
  97                                 __asm__ __volatile__(
  98                                         "stxa %%g0, [%0] %1\n\t"
  99                                         "membar #Sync"
 100                                         : /* no outputs */
 101                                         : "r" (start),
 102                                         "i" (ASI_DCACHE_INVALIDATE));
 103                 }
 104         }
 105 #endif
 106         if (write && tlb_type == spitfire) {
 107                 unsigned long start = (unsigned long) kaddr;
 108                 unsigned long end = start + len;
 109                 unsigned long icache_line_size;
 110
 111                 icache_line_size = local_cpu_data().icache_line_size;
 112
 113                 for (; start < end; start += icache_line_size)
 114                         flushi(start);
 115         }
 116
 117         preempt_enable();
 118 }
 119
 120 static int get_from_target(struct task_struct *target, unsigned long uaddr,
 121                            void *kbuf, int len)
 122 {
 123         if (target == current) {
 124                 if (copy_from_user(kbuf, (void __user *) uaddr, len))
 125                         return -EFAULT;
 126         } else {
 127                 int len2 = access_process_vm(target, uaddr, kbuf, len, 0);
 128                 if (len2 != len)
 129                         return -EFAULT;
 130         }
 131         return 0;
 132 }
 133
 134 static int set_to_target(struct task_struct *target, unsigned long uaddr,
 135                          void *kbuf, int len)
 136 {
 137         if (target == current) {
 138                 if (copy_to_user((void __user *) uaddr, kbuf, len))
 139                         return -EFAULT;
 140         } else {
 141                 int len2 = access_process_vm(target, uaddr, kbuf, len, 1);
 142                 if (len2 != len)
 143                         return -EFAULT;
 144         }
 145         return 0;
 146 }
 147
 148 static int regwindow64_get(struct task_struct *target,
 149                            const struct pt_regs *regs,
 150                            struct reg_window *wbuf)
 151 {
 152         unsigned long rw_addr = regs->u_regs[UREG_I6];
 153
 154         if (test_tsk_thread_flag(current, TIF_32BIT)) {
 155                 struct reg_window32 win32;
 156                 int i;
 157
 158                 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
 159                         return -EFAULT;
 160                 for (i = 0; i < 8; i++)
 161                         wbuf->locals[i] = win32.locals[i];
 162                 for (i = 0; i < 8; i++)
 163                         wbuf->ins[i] = win32.ins[i];
 164         } else {
 165                 rw_addr += STACK_BIAS;
 166                 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 167                         return -EFAULT;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int regwindow64_set(struct task_struct *target,
 174                            const struct pt_regs *regs,
 175                            struct reg_window *wbuf)
 176 {
 177         unsigned long rw_addr = regs->u_regs[UREG_I6];
 178
 179         if (test_tsk_thread_flag(current, TIF_32BIT)) {
 180                 struct reg_window32 win32;
 181                 int i;
 182
 183                 for (i = 0; i < 8; i++)
 184                         win32.locals[i] = wbuf->locals[i];
 185                 for (i = 0; i < 8; i++)
 186                         win32.ins[i] = wbuf->ins[i];
 187
 188                 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
 189                         return -EFAULT;
 190         } else {
 191                 rw_addr += STACK_BIAS;
 192                 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 193                         return -EFAULT;
 194         }
 195
 196         return 0;
 197 }
 198
 199 enum sparc_regset {
 200         REGSET_GENERAL,
 201         REGSET_FP,
 202 };
 203
 204 static int genregs64_get(struct task_struct *target,
 205                          const struct user_regset *regset,
 206                          unsigned int pos, unsigned int count,
 207                          void *kbuf, void __user *ubuf)
 208 {
 209         const struct pt_regs *regs = task_pt_regs(target);
 210         int ret;
 211
 212         if (target == current)
 213                 flushw_user();
 214
 215         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 216                                   regs->u_regs,
 217                                   0, 16 * sizeof(u64));
 218         if (!ret && count && pos < (32 * sizeof(u64))) {
 219                 struct reg_window window;
 220
 221                 if (regwindow64_get(target, regs, &window))
 222                         return -EFAULT;
 223                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 224                                           &window,
 225                                           16 * sizeof(u64),
 226                                           32 * sizeof(u64));
 227         }
 228
 229         if (!ret) {
 230                 /* TSTATE, TPC, TNPC */
 231                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 232                                           &regs->tstate,
 233                                           32 * sizeof(u64),
 234                                           35 * sizeof(u64));
 235         }
 236
 237         if (!ret) {
 238                 unsigned long y = regs->y;
 239
 240                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 241                                           &y,
 242                                           35 * sizeof(u64),
 243                                           36 * sizeof(u64));
 244         }
 245
 246         if (!ret) {
 247                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 248                                                36 * sizeof(u64), -1);
 249
 250         }
 251         return ret;
 252 }
 253
 254 static int genregs64_set(struct task_struct *target,
 255                          const struct user_regset *regset,
 256                          unsigned int pos, unsigned int count,
 257                          const void *kbuf, const void __user *ubuf)
 258 {
 259         struct pt_regs *regs = task_pt_regs(target);
 260         int ret;
 261
 262         if (target == current)
 263                 flushw_user();
 264
 265         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 266                                  regs->u_regs,
 267                                  0, 16 * sizeof(u64));
 268         if (!ret && count && pos < (32 * sizeof(u64))) {
 269                 struct reg_window window;
 270
 271                 if (regwindow64_get(target, regs, &window))
 272                         return -EFAULT;
 273
 274                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 275                                          &window,
 276                                          16 * sizeof(u64),
 277                                          32 * sizeof(u64));
 278
 279                 if (!ret &&
 280                     regwindow64_set(target, regs, &window))
 281                         return -EFAULT;
 282         }
 283
 284         if (!ret && count > 0) {
 285                 unsigned long tstate;
 286
 287                 /* TSTATE */
 288                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 289                                          &tstate,
 290                                          32 * sizeof(u64),
 291                                          33 * sizeof(u64));
 292                 if (!ret) {
 293                         /* Only the condition codes and the "in syscall"
 294                          * state can be modified in the %tstate register.
 295                          */
 296                         tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 297                         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 298                         regs->tstate |= tstate;
 299                 }
 300         }
 301
 302         if (!ret) {
 303                 /* TPC, TNPC */
 304                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 305                                          &regs->tpc,
 306                                          33 * sizeof(u64),
 307                                          35 * sizeof(u64));
 308         }
 309
 310         if (!ret) {
 311                 unsigned long y;
 312
 313                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 314                                          &y,
 315                                          35 * sizeof(u64),
 316                                          36 * sizeof(u64));
 317                 if (!ret)
 318                         regs->y = y;
 319         }
 320
 321         if (!ret)
 322                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 323                                                 36 * sizeof(u64), -1);
 324
 325         return ret;
 326 }
 327
 328 static int fpregs64_get(struct task_struct *target,
 329                         const struct user_regset *regset,
 330                         unsigned int pos, unsigned int count,
 331                         void *kbuf, void __user *ubuf)
 332 {
 333         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 334         unsigned long fprs, fsr, gsr;
 335         int ret;
 336
 337         if (target == current)
 338                 save_and_clear_fpu();
 339
 340         fprs = task_thread_info(target)->fpsaved[0];
 341
 342         if (fprs & FPRS_DL)
 343                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 344                                           fpregs,
 345                                           0, 16 * sizeof(u64));
 346         else
 347                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 348                                                0,
 349                                                16 * sizeof(u64));
 350
 351         if (!ret) {
 352                 if (fprs & FPRS_DU)
 353                         ret = user_regset_copyout(&pos, &count,
 354                                                   &kbuf, &ubuf,
 355                                                   fpregs + 16,
 356                                                   16 * sizeof(u64),
 357                                                   32 * sizeof(u64));
 358                 else
 359                         ret = user_regset_copyout_zero(&pos, &count,
 360                                                        &kbuf, &ubuf,
 361                                                        16 * sizeof(u64),
 362                                                        32 * sizeof(u64));
 363         }
 364
 365         if (fprs & FPRS_FEF) {
 366                 fsr = task_thread_info(target)->xfsr[0];
 367                 gsr = task_thread_info(target)->gsr[0];
 368         } else {
 369                 fsr = gsr = 0;
 370         }
 371
 372         if (!ret)
 373                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 374                                           &fsr,
 375                                           32 * sizeof(u64),
 376                                           33 * sizeof(u64));
 377         if (!ret)
 378                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 379                                           &gsr,
 380                                           33 * sizeof(u64),
 381                                           34 * sizeof(u64));
 382         if (!ret)
 383                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 384                                           &fprs,
 385                                           34 * sizeof(u64),
 386                                           35 * sizeof(u64));
 387
 388         if (!ret)
 389                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 390                                                35 * sizeof(u64), -1);
 391
 392         return ret;
 393 }
 394
 395 static int fpregs64_set(struct task_struct *target,
 396                         const struct user_regset *regset,
 397                         unsigned int pos, unsigned int count,
 398                         const void *kbuf, const void __user *ubuf)
 399 {
 400         unsigned long *fpregs = task_thread_info(target)->fpregs;
 401         unsigned long fprs;
 402         int ret;
 403
 404         if (target == current)
 405                 save_and_clear_fpu();
 406
 407         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 408                                  fpregs,
 409                                  0, 32 * sizeof(u64));
 410         if (!ret)
 411                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 412                                          task_thread_info(target)->xfsr,
 413                                          32 * sizeof(u64),
 414                                          33 * sizeof(u64));
 415         if (!ret)
 416                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 417                                          task_thread_info(target)->gsr,
 418                                          33 * sizeof(u64),
 419                                          34 * sizeof(u64));
 420
 421         fprs = task_thread_info(target)->fpsaved[0];
 422         if (!ret && count > 0) {
 423                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 424                                          &fprs,
 425                                          34 * sizeof(u64),
 426                                          35 * sizeof(u64));
 427         }
 428
 429         fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 430         task_thread_info(target)->fpsaved[0] = fprs;
 431
 432         if (!ret)
 433                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 434                                                 35 * sizeof(u64), -1);
 435         return ret;
 436 }
 437
 438 static const struct user_regset sparc64_regsets[] = {
 439         /* Format is:
 440          *      G0 --> G7
 441          *      O0 --> O7
 442          *      L0 --> L7
 443          *      I0 --> I7
 444          *      TSTATE, TPC, TNPC, Y
 445          */
 446         [REGSET_GENERAL] = {
 447                 .core_note_type = NT_PRSTATUS,
 448                 .n = 36,
 449                 .size = sizeof(u64), .align = sizeof(u64),
 450                 .get = genregs64_get, .set = genregs64_set
 451         },
 452         /* Format is:
 453          *      F0 --> F63
 454          *      FSR
 455          *      GSR
 456          *      FPRS
 457          */
 458         [REGSET_FP] = {
 459                 .core_note_type = NT_PRFPREG,
 460                 .n = 35,
 461                 .size = sizeof(u64), .align = sizeof(u64),
 462                 .get = fpregs64_get, .set = fpregs64_set
 463         },
 464 };
 465
 466 static const struct user_regset_view user_sparc64_view = {
 467         .name = "sparc64", .e_machine = EM_SPARCV9,
 468         .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
 469 };
 470
 471 #ifdef CONFIG_COMPAT
 472 static int genregs32_get(struct task_struct *target,
 473                          const struct user_regset *regset,
 474                          unsigned int pos, unsigned int count,
 475                          void *kbuf, void __user *ubuf)
 476 {
 477         const struct pt_regs *regs = task_pt_regs(target);
 478         compat_ulong_t __user *reg_window;
 479         compat_ulong_t *k = kbuf;
 480         compat_ulong_t __user *u = ubuf;
 481         compat_ulong_t reg;
 482
 483         if (target == current)
 484                 flushw_user();
 485
 486         pos /= sizeof(reg);
 487         count /= sizeof(reg);
 488
 489         if (kbuf) {
 490                 for (; count > 0 && pos < 16; count--)
 491                         *k++ = regs->u_regs[pos++];
 492
 493                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 494                 reg_window -= 16;
 495                 if (target == current) {
 496                         for (; count > 0 && pos < 32; count--) {
 497                                 if (get_user(*k++, &reg_window[pos++]))
 498                                         return -EFAULT;
 499                         }
 500                 } else {
 501                         for (; count > 0 && pos < 32; count--) {
 502                                 if (access_process_vm(target,
 503                                                       (unsigned long)
 504                                                       &reg_window[pos],
 505                                                       k, sizeof(*k), 0)
 506                                     != sizeof(*k))
 507                                         return -EFAULT;
 508                                 k++;
 509                                 pos++;
 510                         }
 511                 }
 512         } else {
 513                 for (; count > 0 && pos < 16; count--) {
 514                         if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
 515                                 return -EFAULT;
 516                 }
 517
 518                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 519                 reg_window -= 16;
 520                 if (target == current) {
 521                         for (; count > 0 && pos < 32; count--) {
 522                                 if (get_user(reg, &reg_window[pos++]) ||
 523                                     put_user(reg, u++))
 524                                         return -EFAULT;
 525                         }
 526                 } else {
 527                         for (; count > 0 && pos < 32; count--) {
 528                                 if (access_process_vm(target,
 529                                                       (unsigned long)
 530                                                       &reg_window[pos],
 531                                                       &reg, sizeof(reg), 0)
 532                                     != sizeof(reg))
 533                                         return -EFAULT;
 534                                 if (access_process_vm(target,
 535                                                       (unsigned long) u,
 536                                                       &reg, sizeof(reg), 1)
 537                                     != sizeof(reg))
 538                                         return -EFAULT;
 539                                 pos++;
 540                                 u++;
 541                         }
 542                 }
 543         }
 544         while (count > 0) {
 545                 switch (pos) {
 546                 case 32: /* PSR */
 547                         reg = tstate_to_psr(regs->tstate);
 548                         break;
 549                 case 33: /* PC */
 550                         reg = regs->tpc;
 551                         break;
 552                 case 34: /* NPC */
 553                         reg = regs->tnpc;
 554                         break;
 555                 case 35: /* Y */
 556                         reg = regs->y;
 557                         break;
 558                 case 36: /* WIM */
 559                 case 37: /* TBR */
 560                         reg = 0;
 561                         break;
 562                 default:
 563                         goto finish;
 564                 }
 565
 566                 if (kbuf)
 567                         *k++ = reg;
 568                 else if (put_user(reg, u++))
 569                         return -EFAULT;
 570                 pos++;
 571                 count--;
 572         }
 573 finish:
 574         pos *= sizeof(reg);
 575         count *= sizeof(reg);
 576
 577         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 578                                         38 * sizeof(reg), -1);
 579 }
 580
 581 static int genregs32_set(struct task_struct *target,
 582                          const struct user_regset *regset,
 583                          unsigned int pos, unsigned int count,
 584                          const void *kbuf, const void __user *ubuf)
 585 {
 586         struct pt_regs *regs = task_pt_regs(target);
 587         compat_ulong_t __user *reg_window;
 588         const compat_ulong_t *k = kbuf;
 589         const compat_ulong_t __user *u = ubuf;
 590         compat_ulong_t reg;
 591
 592         if (target == current)
 593                 flushw_user();
 594
 595         pos /= sizeof(reg);
 596         count /= sizeof(reg);
 597
 598         if (kbuf) {
 599                 for (; count > 0 && pos < 16; count--)
 600                         regs->u_regs[pos++] = *k++;
 601
 602                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 603                 reg_window -= 16;
 604                 if (target == current) {
 605                         for (; count > 0 && pos < 32; count--) {
 606                                 if (put_user(*k++, &reg_window[pos++]))
 607                                         return -EFAULT;
 608                         }
 609                 } else {
 610                         for (; count > 0 && pos < 32; count--) {
 611                                 if (access_process_vm(target,
 612                                                       (unsigned long)
 613                                                       &reg_window[pos],
 614                                                       (void *) k,
 615                                                       sizeof(*k), 1)
 616                                     != sizeof(*k))
 617                                         return -EFAULT;
 618                                 k++;
 619                                 pos++;
 620                         }
 621                 }
 622         } else {
 623                 for (; count > 0 && pos < 16; count--) {
 624                         if (get_user(reg, u++))
 625                                 return -EFAULT;
 626                         regs->u_regs[pos++] = reg;
 627                 }
 628
 629                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 630                 reg_window -= 16;
 631                 if (target == current) {
 632                         for (; count > 0 && pos < 32; count--) {
 633                                 if (get_user(reg, u++) ||
 634                                     put_user(reg, &reg_window[pos++]))
 635                                         return -EFAULT;
 636                         }
 637                 } else {
 638                         for (; count > 0 && pos < 32; count--) {
 639                                 if (access_process_vm(target,
 640                                                       (unsigned long)
 641                                                       u,
 642                                                       &reg, sizeof(reg), 0)
 643                                     != sizeof(reg))
 644                                         return -EFAULT;
 645                                 if (access_process_vm(target,
 646                                                       (unsigned long)
 647                                                       &reg_window[pos],
 648                                                       &reg, sizeof(reg), 1)
 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_SYSCALL_TRACE))
1068                 ret = tracehook_report_syscall_entry(regs);
1069
1070         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1071                 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1072
1073         audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
1074                              AUDIT_ARCH_SPARC :
1075                              AUDIT_ARCH_SPARC64),
1076                             regs->u_regs[UREG_G1],
1077                             regs->u_regs[UREG_I0],
1078                             regs->u_regs[UREG_I1],
1079                             regs->u_regs[UREG_I2],
1080                             regs->u_regs[UREG_I3]);
1081
1082         return ret;
1083 }
1084
1085 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1086 {
1087         audit_syscall_exit(regs);
1088
1089         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1090                 trace_sys_exit(regs, regs->u_regs[UREG_G1]);
1091
1092         if (test_thread_flag(TIF_SYSCALL_TRACE))
1093                 tracehook_report_syscall_exit(regs, 0);
1094 }