arch/sparc/kernel/ptrace_64.c

   1 /* ptrace.c: Sparc process tracing support.
   2  *
   3  * Copyright (C) 1996, 2008 David S. Miller ([email protected])
   4  * Copyright (C) 1997 Jakub Jelinek ([email protected])
   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/sched/task_stack.h>
  16 #include <linux/mm.h>
  17 #include <linux/errno.h>
  18 #include <linux/export.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/user.h>
  21 #include <linux/smp.h>
  22 #include <linux/security.h>
  23 #include <linux/seccomp.h>
  24 #include <linux/audit.h>
  25 #include <linux/signal.h>
  26 #include <linux/regset.h>
  27 #include <linux/tracehook.h>
  28 #include <trace/syscall.h>
  29 #include <linux/compat.h>
  30 #include <linux/elf.h>
  31 #include <linux/context_tracking.h>
  32
  33 #include <asm/asi.h>
  34 #include <asm/pgtable.h>
  35 #include <linux/uaccess.h>
  36 #include <asm/psrcompat.h>
  37 #include <asm/visasm.h>
  38 #include <asm/spitfire.h>
  39 #include <asm/page.h>
  40 #include <asm/cpudata.h>
  41 #include <asm/cacheflush.h>
  42
  43 #define CREATE_TRACE_POINTS
  44 #include <trace/events/syscalls.h>
  45
  46 #include "entry.h"
  47
  48 /* #define ALLOW_INIT_TRACING */
  49
  50 struct pt_regs_offset {
  51         const char *name;
  52         int offset;
  53 };
  54
  55 #define REG_OFFSET_NAME(n, r) \
  56         {.name = n, .offset = (PT_V9_##r)}
  57 #define REG_OFFSET_END {.name = NULL, .offset = 0}
  58
  59 static const struct pt_regs_offset regoffset_table[] = {
  60         REG_OFFSET_NAME("g0", G0),
  61         REG_OFFSET_NAME("g1", G1),
  62         REG_OFFSET_NAME("g2", G2),
  63         REG_OFFSET_NAME("g3", G3),
  64         REG_OFFSET_NAME("g4", G4),
  65         REG_OFFSET_NAME("g5", G5),
  66         REG_OFFSET_NAME("g6", G6),
  67         REG_OFFSET_NAME("g7", G7),
  68
  69         REG_OFFSET_NAME("i0", I0),
  70         REG_OFFSET_NAME("i1", I1),
  71         REG_OFFSET_NAME("i2", I2),
  72         REG_OFFSET_NAME("i3", I3),
  73         REG_OFFSET_NAME("i4", I4),
  74         REG_OFFSET_NAME("i5", I5),
  75         REG_OFFSET_NAME("i6", I6),
  76         REG_OFFSET_NAME("i7", I7),
  77
  78         REG_OFFSET_NAME("tstate", TSTATE),
  79         REG_OFFSET_NAME("pc", TPC),
  80         REG_OFFSET_NAME("npc", TNPC),
  81         REG_OFFSET_NAME("y", Y),
  82         REG_OFFSET_NAME("lr", I7),
  83
  84         REG_OFFSET_END,
  85 };
  86
  87 /*
  88  * Called by kernel/ptrace.c when detaching..
  89  *
  90  * Make sure single step bits etc are not set.
  91  */
  92 void ptrace_disable(struct task_struct *child)
  93 {
  94         /* nothing to do */
  95 }
  96
  97 /* To get the necessary page struct, access_process_vm() first calls
  98  * get_user_pages().  This has done a flush_dcache_page() on the
  99  * accessed page.  Then our caller (copy_{to,from}_user_page()) did
 100  * to memcpy to read/write the data from that page.
 101  *
 102  * Now, the only thing we have to do is:
 103  * 1) flush the D-cache if it's possible than an illegal alias
 104  *    has been created
 105  * 2) flush the I-cache if this is pre-cheetah and we did a write
 106  */
 107 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
 108                          unsigned long uaddr, void *kaddr,
 109                          unsigned long len, int write)
 110 {
 111         BUG_ON(len > PAGE_SIZE);
 112
 113         if (tlb_type == hypervisor)
 114                 return;
 115
 116         preempt_disable();
 117
 118 #ifdef DCACHE_ALIASING_POSSIBLE
 119         /* If bit 13 of the kernel address we used to access the
 120          * user page is the same as the virtual address that page
 121          * is mapped to in the user's address space, we can skip the
 122          * D-cache flush.
 123          */
 124         if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
 125                 unsigned long start = __pa(kaddr);
 126                 unsigned long end = start + len;
 127                 unsigned long dcache_line_size;
 128
 129                 dcache_line_size = local_cpu_data().dcache_line_size;
 130
 131                 if (tlb_type == spitfire) {
 132                         for (; start < end; start += dcache_line_size)
 133                                 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
 134                 } else {
 135                         start &= ~(dcache_line_size - 1);
 136                         for (; start < end; start += dcache_line_size)
 137                                 __asm__ __volatile__(
 138                                         "stxa %%g0, [%0] %1\n\t"
 139                                         "membar #Sync"
 140                                         : /* no outputs */
 141                                         : "r" (start),
 142                                         "i" (ASI_DCACHE_INVALIDATE));
 143                 }
 144         }
 145 #endif
 146         if (write && tlb_type == spitfire) {
 147                 unsigned long start = (unsigned long) kaddr;
 148                 unsigned long end = start + len;
 149                 unsigned long icache_line_size;
 150
 151                 icache_line_size = local_cpu_data().icache_line_size;
 152
 153                 for (; start < end; start += icache_line_size)
 154                         flushi(start);
 155         }
 156
 157         preempt_enable();
 158 }
 159 EXPORT_SYMBOL_GPL(flush_ptrace_access);
 160
 161 static int get_from_target(struct task_struct *target, unsigned long uaddr,
 162                            void *kbuf, int len)
 163 {
 164         if (target == current) {
 165                 if (copy_from_user(kbuf, (void __user *) uaddr, len))
 166                         return -EFAULT;
 167         } else {
 168                 int len2 = access_process_vm(target, uaddr, kbuf, len,
 169                                 FOLL_FORCE);
 170                 if (len2 != len)
 171                         return -EFAULT;
 172         }
 173         return 0;
 174 }
 175
 176 static int set_to_target(struct task_struct *target, unsigned long uaddr,
 177                          void *kbuf, int len)
 178 {
 179         if (target == current) {
 180                 if (copy_to_user((void __user *) uaddr, kbuf, len))
 181                         return -EFAULT;
 182         } else {
 183                 int len2 = access_process_vm(target, uaddr, kbuf, len,
 184                                 FOLL_FORCE | FOLL_WRITE);
 185                 if (len2 != len)
 186                         return -EFAULT;
 187         }
 188         return 0;
 189 }
 190
 191 static int regwindow64_get(struct task_struct *target,
 192                            const struct pt_regs *regs,
 193                            struct reg_window *wbuf)
 194 {
 195         unsigned long rw_addr = regs->u_regs[UREG_I6];
 196
 197         if (!test_thread_64bit_stack(rw_addr)) {
 198                 struct reg_window32 win32;
 199                 int i;
 200
 201                 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
 202                         return -EFAULT;
 203                 for (i = 0; i < 8; i++)
 204                         wbuf->locals[i] = win32.locals[i];
 205                 for (i = 0; i < 8; i++)
 206                         wbuf->ins[i] = win32.ins[i];
 207         } else {
 208                 rw_addr += STACK_BIAS;
 209                 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 210                         return -EFAULT;
 211         }
 212
 213         return 0;
 214 }
 215
 216 static int regwindow64_set(struct task_struct *target,
 217                            const struct pt_regs *regs,
 218                            struct reg_window *wbuf)
 219 {
 220         unsigned long rw_addr = regs->u_regs[UREG_I6];
 221
 222         if (!test_thread_64bit_stack(rw_addr)) {
 223                 struct reg_window32 win32;
 224                 int i;
 225
 226                 for (i = 0; i < 8; i++)
 227                         win32.locals[i] = wbuf->locals[i];
 228                 for (i = 0; i < 8; i++)
 229                         win32.ins[i] = wbuf->ins[i];
 230
 231                 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
 232                         return -EFAULT;
 233         } else {
 234                 rw_addr += STACK_BIAS;
 235                 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 236                         return -EFAULT;
 237         }
 238
 239         return 0;
 240 }
 241
 242 enum sparc_regset {
 243         REGSET_GENERAL,
 244         REGSET_FP,
 245 };
 246
 247 static int genregs64_get(struct task_struct *target,
 248                          const struct user_regset *regset,
 249                          unsigned int pos, unsigned int count,
 250                          void *kbuf, void __user *ubuf)
 251 {
 252         const struct pt_regs *regs = task_pt_regs(target);
 253         int ret;
 254
 255         if (target == current)
 256                 flushw_user();
 257
 258         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 259                                   regs->u_regs,
 260                                   0, 16 * sizeof(u64));
 261         if (!ret && count && pos < (32 * sizeof(u64))) {
 262                 struct reg_window window;
 263
 264                 if (regwindow64_get(target, regs, &window))
 265                         return -EFAULT;
 266                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 267                                           &window,
 268                                           16 * sizeof(u64),
 269                                           32 * sizeof(u64));
 270         }
 271
 272         if (!ret) {
 273                 /* TSTATE, TPC, TNPC */
 274                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 275                                           &regs->tstate,
 276                                           32 * sizeof(u64),
 277                                           35 * sizeof(u64));
 278         }
 279
 280         if (!ret) {
 281                 unsigned long y = regs->y;
 282
 283                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 284                                           &y,
 285                                           35 * sizeof(u64),
 286                                           36 * sizeof(u64));
 287         }
 288
 289         if (!ret) {
 290                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 291                                                36 * sizeof(u64), -1);
 292
 293         }
 294         return ret;
 295 }
 296
 297 static int genregs64_set(struct task_struct *target,
 298                          const struct user_regset *regset,
 299                          unsigned int pos, unsigned int count,
 300                          const void *kbuf, const void __user *ubuf)
 301 {
 302         struct pt_regs *regs = task_pt_regs(target);
 303         int ret;
 304
 305         if (target == current)
 306                 flushw_user();
 307
 308         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 309                                  regs->u_regs,
 310                                  0, 16 * sizeof(u64));
 311         if (!ret && count && pos < (32 * sizeof(u64))) {
 312                 struct reg_window window;
 313
 314                 if (regwindow64_get(target, regs, &window))
 315                         return -EFAULT;
 316
 317                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 318                                          &window,
 319                                          16 * sizeof(u64),
 320                                          32 * sizeof(u64));
 321
 322                 if (!ret &&
 323                     regwindow64_set(target, regs, &window))
 324                         return -EFAULT;
 325         }
 326
 327         if (!ret && count > 0) {
 328                 unsigned long tstate;
 329
 330                 /* TSTATE */
 331                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 332                                          &tstate,
 333                                          32 * sizeof(u64),
 334                                          33 * sizeof(u64));
 335                 if (!ret) {
 336                         /* Only the condition codes and the "in syscall"
 337                          * state can be modified in the %tstate register.
 338                          */
 339                         tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 340                         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 341                         regs->tstate |= tstate;
 342                 }
 343         }
 344
 345         if (!ret) {
 346                 /* TPC, TNPC */
 347                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 348                                          &regs->tpc,
 349                                          33 * sizeof(u64),
 350                                          35 * sizeof(u64));
 351         }
 352
 353         if (!ret) {
 354                 unsigned long y;
 355
 356                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 357                                          &y,
 358                                          35 * sizeof(u64),
 359                                          36 * sizeof(u64));
 360                 if (!ret)
 361                         regs->y = y;
 362         }
 363
 364         if (!ret)
 365                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 366                                                 36 * sizeof(u64), -1);
 367
 368         return ret;
 369 }
 370
 371 static int fpregs64_get(struct task_struct *target,
 372                         const struct user_regset *regset,
 373                         unsigned int pos, unsigned int count,
 374                         void *kbuf, void __user *ubuf)
 375 {
 376         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 377         unsigned long fprs, fsr, gsr;
 378         int ret;
 379
 380         if (target == current)
 381                 save_and_clear_fpu();
 382
 383         fprs = task_thread_info(target)->fpsaved[0];
 384
 385         if (fprs & FPRS_DL)
 386                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 387                                           fpregs,
 388                                           0, 16 * sizeof(u64));
 389         else
 390                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 391                                                0,
 392                                                16 * sizeof(u64));
 393
 394         if (!ret) {
 395                 if (fprs & FPRS_DU)
 396                         ret = user_regset_copyout(&pos, &count,
 397                                                   &kbuf, &ubuf,
 398                                                   fpregs + 16,
 399                                                   16 * sizeof(u64),
 400                                                   32 * sizeof(u64));
 401                 else
 402                         ret = user_regset_copyout_zero(&pos, &count,
 403                                                        &kbuf, &ubuf,
 404                                                        16 * sizeof(u64),
 405                                                        32 * sizeof(u64));
 406         }
 407
 408         if (fprs & FPRS_FEF) {
 409                 fsr = task_thread_info(target)->xfsr[0];
 410                 gsr = task_thread_info(target)->gsr[0];
 411         } else {
 412                 fsr = gsr = 0;
 413         }
 414
 415         if (!ret)
 416                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 417                                           &fsr,
 418                                           32 * sizeof(u64),
 419                                           33 * sizeof(u64));
 420         if (!ret)
 421                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 422                                           &gsr,
 423                                           33 * sizeof(u64),
 424                                           34 * sizeof(u64));
 425         if (!ret)
 426                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 427                                           &fprs,
 428                                           34 * sizeof(u64),
 429                                           35 * sizeof(u64));
 430
 431         if (!ret)
 432                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 433                                                35 * sizeof(u64), -1);
 434
 435         return ret;
 436 }
 437
 438 static int fpregs64_set(struct task_struct *target,
 439                         const struct user_regset *regset,
 440                         unsigned int pos, unsigned int count,
 441                         const void *kbuf, const void __user *ubuf)
 442 {
 443         unsigned long *fpregs = task_thread_info(target)->fpregs;
 444         unsigned long fprs;
 445         int ret;
 446
 447         if (target == current)
 448                 save_and_clear_fpu();
 449
 450         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 451                                  fpregs,
 452                                  0, 32 * sizeof(u64));
 453         if (!ret)
 454                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 455                                          task_thread_info(target)->xfsr,
 456                                          32 * sizeof(u64),
 457                                          33 * sizeof(u64));
 458         if (!ret)
 459                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 460                                          task_thread_info(target)->gsr,
 461                                          33 * sizeof(u64),
 462                                          34 * sizeof(u64));
 463
 464         fprs = task_thread_info(target)->fpsaved[0];
 465         if (!ret && count > 0) {
 466                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 467                                          &fprs,
 468                                          34 * sizeof(u64),
 469                                          35 * sizeof(u64));
 470         }
 471
 472         fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 473         task_thread_info(target)->fpsaved[0] = fprs;
 474
 475         if (!ret)
 476                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 477                                                 35 * sizeof(u64), -1);
 478         return ret;
 479 }
 480
 481 static const struct user_regset sparc64_regsets[] = {
 482         /* Format is:
 483          *      G0 --> G7
 484          *      O0 --> O7
 485          *      L0 --> L7
 486          *      I0 --> I7
 487          *      TSTATE, TPC, TNPC, Y
 488          */
 489         [REGSET_GENERAL] = {
 490                 .core_note_type = NT_PRSTATUS,
 491                 .n = 36,
 492                 .size = sizeof(u64), .align = sizeof(u64),
 493                 .get = genregs64_get, .set = genregs64_set
 494         },
 495         /* Format is:
 496          *      F0 --> F63
 497          *      FSR
 498          *      GSR
 499          *      FPRS
 500          */
 501         [REGSET_FP] = {
 502                 .core_note_type = NT_PRFPREG,
 503                 .n = 35,
 504                 .size = sizeof(u64), .align = sizeof(u64),
 505                 .get = fpregs64_get, .set = fpregs64_set
 506         },
 507 };
 508
 509 static const struct user_regset_view user_sparc64_view = {
 510         .name = "sparc64", .e_machine = EM_SPARCV9,
 511         .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
 512 };
 513
 514 #ifdef CONFIG_COMPAT
 515 static int genregs32_get(struct task_struct *target,
 516                          const struct user_regset *regset,
 517                          unsigned int pos, unsigned int count,
 518                          void *kbuf, void __user *ubuf)
 519 {
 520         const struct pt_regs *regs = task_pt_regs(target);
 521         compat_ulong_t __user *reg_window;
 522         compat_ulong_t *k = kbuf;
 523         compat_ulong_t __user *u = ubuf;
 524         compat_ulong_t reg;
 525
 526         if (target == current)
 527                 flushw_user();
 528
 529         pos /= sizeof(reg);
 530         count /= sizeof(reg);
 531
 532         if (kbuf) {
 533                 for (; count > 0 && pos < 16; count--)
 534                         *k++ = regs->u_regs[pos++];
 535
 536                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 537                 reg_window -= 16;
 538                 if (target == current) {
 539                         for (; count > 0 && pos < 32; count--) {
 540                                 if (get_user(*k++, &reg_window[pos++]))
 541                                         return -EFAULT;
 542                         }
 543                 } else {
 544                         for (; count > 0 && pos < 32; count--) {
 545                                 if (access_process_vm(target,
 546                                                       (unsigned long)
 547                                                       &reg_window[pos],
 548                                                       k, sizeof(*k),
 549                                                       FOLL_FORCE)
 550                                     != sizeof(*k))
 551                                         return -EFAULT;
 552                                 k++;
 553                                 pos++;
 554                         }
 555                 }
 556         } else {
 557                 for (; count > 0 && pos < 16; count--) {
 558                         if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
 559                                 return -EFAULT;
 560                 }
 561
 562                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 563                 reg_window -= 16;
 564                 if (target == current) {
 565                         for (; count > 0 && pos < 32; count--) {
 566                                 if (get_user(reg, &reg_window[pos++]) ||
 567                                     put_user(reg, u++))
 568                                         return -EFAULT;
 569                         }
 570                 } else {
 571                         for (; count > 0 && pos < 32; count--) {
 572                                 if (access_process_vm(target,
 573                                                       (unsigned long)
 574                                                       &reg_window[pos],
 575                                                       &reg, sizeof(reg),
 576                                                       FOLL_FORCE)
 577                                     != sizeof(reg))
 578                                         return -EFAULT;
 579                                 if (access_process_vm(target,
 580                                                       (unsigned long) u,
 581                                                       &reg, sizeof(reg),
 582                                                       FOLL_FORCE | FOLL_WRITE)
 583                                     != sizeof(reg))
 584                                         return -EFAULT;
 585                                 pos++;
 586                                 u++;
 587                         }
 588                 }
 589         }
 590         while (count > 0) {
 591                 switch (pos) {
 592                 case 32: /* PSR */
 593                         reg = tstate_to_psr(regs->tstate);
 594                         break;
 595                 case 33: /* PC */
 596                         reg = regs->tpc;
 597                         break;
 598                 case 34: /* NPC */
 599                         reg = regs->tnpc;
 600                         break;
 601                 case 35: /* Y */
 602                         reg = regs->y;
 603                         break;
 604                 case 36: /* WIM */
 605                 case 37: /* TBR */
 606                         reg = 0;
 607                         break;
 608                 default:
 609                         goto finish;
 610                 }
 611
 612                 if (kbuf)
 613                         *k++ = reg;
 614                 else if (put_user(reg, u++))
 615                         return -EFAULT;
 616                 pos++;
 617                 count--;
 618         }
 619 finish:
 620         pos *= sizeof(reg);
 621         count *= sizeof(reg);
 622
 623         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 624                                         38 * sizeof(reg), -1);
 625 }
 626
 627 static int genregs32_set(struct task_struct *target,
 628                          const struct user_regset *regset,
 629                          unsigned int pos, unsigned int count,
 630                          const void *kbuf, const void __user *ubuf)
 631 {
 632         struct pt_regs *regs = task_pt_regs(target);
 633         compat_ulong_t __user *reg_window;
 634         const compat_ulong_t *k = kbuf;
 635         const compat_ulong_t __user *u = ubuf;
 636         compat_ulong_t reg;
 637
 638         if (target == current)
 639                 flushw_user();
 640
 641         pos /= sizeof(reg);
 642         count /= sizeof(reg);
 643
 644         if (kbuf) {
 645                 for (; count > 0 && pos < 16; count--)
 646                         regs->u_regs[pos++] = *k++;
 647
 648                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 649                 reg_window -= 16;
 650                 if (target == current) {
 651                         for (; count > 0 && pos < 32; count--) {
 652                                 if (put_user(*k++, &reg_window[pos++]))
 653                                         return -EFAULT;
 654                         }
 655                 } else {
 656                         for (; count > 0 && pos < 32; count--) {
 657                                 if (access_process_vm(target,
 658                                                       (unsigned long)
 659                                                       &reg_window[pos],
 660                                                       (void *) k,
 661                                                       sizeof(*k),
 662                                                       FOLL_FORCE | FOLL_WRITE)
 663                                     != sizeof(*k))
 664                                         return -EFAULT;
 665                                 k++;
 666                                 pos++;
 667                         }
 668                 }
 669         } else {
 670                 for (; count > 0 && pos < 16; count--) {
 671                         if (get_user(reg, u++))
 672                                 return -EFAULT;
 673                         regs->u_regs[pos++] = reg;
 674                 }
 675
 676                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 677                 reg_window -= 16;
 678                 if (target == current) {
 679                         for (; count > 0 && pos < 32; count--) {
 680                                 if (get_user(reg, u++) ||
 681                                     put_user(reg, &reg_window[pos++]))
 682                                         return -EFAULT;
 683                         }
 684                 } else {
 685                         for (; count > 0 && pos < 32; count--) {
 686                                 if (access_process_vm(target,
 687                                                       (unsigned long)
 688                                                       u,
 689                                                       &reg, sizeof(reg),
 690                                                       FOLL_FORCE)
 691                                     != sizeof(reg))
 692                                         return -EFAULT;
 693                                 if (access_process_vm(target,
 694                                                       (unsigned long)
 695                                                       &reg_window[pos],
 696                                                       &reg, sizeof(reg),
 697                                                       FOLL_FORCE | FOLL_WRITE)
 698                                     != sizeof(reg))
 699                                         return -EFAULT;
 700                                 pos++;
 701                                 u++;
 702                         }
 703                 }
 704         }
 705         while (count > 0) {
 706                 unsigned long tstate;
 707
 708                 if (kbuf)
 709                         reg = *k++;
 710                 else if (get_user(reg, u++))
 711                         return -EFAULT;
 712
 713                 switch (pos) {
 714                 case 32: /* PSR */
 715                         tstate = regs->tstate;
 716                         tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 717                         tstate |= psr_to_tstate_icc(reg);
 718                         if (reg & PSR_SYSCALL)
 719                                 tstate |= TSTATE_SYSCALL;
 720                         regs->tstate = tstate;
 721                         break;
 722                 case 33: /* PC */
 723                         regs->tpc = reg;
 724                         break;
 725                 case 34: /* NPC */
 726                         regs->tnpc = reg;
 727                         break;
 728                 case 35: /* Y */
 729                         regs->y = reg;
 730                         break;
 731                 case 36: /* WIM */
 732                 case 37: /* TBR */
 733                         break;
 734                 default:
 735                         goto finish;
 736                 }
 737
 738                 pos++;
 739                 count--;
 740         }
 741 finish:
 742         pos *= sizeof(reg);
 743         count *= sizeof(reg);
 744
 745         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 746                                          38 * sizeof(reg), -1);
 747 }
 748
 749 static int fpregs32_get(struct task_struct *target,
 750                         const struct user_regset *regset,
 751                         unsigned int pos, unsigned int count,
 752                         void *kbuf, void __user *ubuf)
 753 {
 754         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 755         compat_ulong_t enabled;
 756         unsigned long fprs;
 757         compat_ulong_t fsr;
 758         int ret = 0;
 759
 760         if (target == current)
 761                 save_and_clear_fpu();
 762
 763         fprs = task_thread_info(target)->fpsaved[0];
 764         if (fprs & FPRS_FEF) {
 765                 fsr = task_thread_info(target)->xfsr[0];
 766                 enabled = 1;
 767         } else {
 768                 fsr = 0;
 769                 enabled = 0;
 770         }
 771
 772         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 773                                   fpregs,
 774                                   0, 32 * sizeof(u32));
 775
 776         if (!ret)
 777                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 778                                                32 * sizeof(u32),
 779                                                33 * sizeof(u32));
 780         if (!ret)
 781                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 782                                           &fsr,
 783                                           33 * sizeof(u32),
 784                                           34 * sizeof(u32));
 785
 786         if (!ret) {
 787                 compat_ulong_t val;
 788
 789                 val = (enabled << 8) | (8 << 16);
 790                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 791                                           &val,
 792                                           34 * sizeof(u32),
 793                                           35 * sizeof(u32));
 794         }
 795
 796         if (!ret)
 797                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 798                                                35 * sizeof(u32), -1);
 799
 800         return ret;
 801 }
 802
 803 static int fpregs32_set(struct task_struct *target,
 804                         const struct user_regset *regset,
 805                         unsigned int pos, unsigned int count,
 806                         const void *kbuf, const void __user *ubuf)
 807 {
 808         unsigned long *fpregs = task_thread_info(target)->fpregs;
 809         unsigned long fprs;
 810         int ret;
 811
 812         if (target == current)
 813                 save_and_clear_fpu();
 814
 815         fprs = task_thread_info(target)->fpsaved[0];
 816
 817         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 818                                  fpregs,
 819                                  0, 32 * sizeof(u32));
 820         if (!ret)
 821                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 822                                           32 * sizeof(u32),
 823                                           33 * sizeof(u32));
 824         if (!ret && count > 0) {
 825                 compat_ulong_t fsr;
 826                 unsigned long val;
 827
 828                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 829                                          &fsr,
 830                                          33 * sizeof(u32),
 831                                          34 * sizeof(u32));
 832                 if (!ret) {
 833                         val = task_thread_info(target)->xfsr[0];
 834                         val &= 0xffffffff00000000UL;
 835                         val |= fsr;
 836                         task_thread_info(target)->xfsr[0] = val;
 837                 }
 838         }
 839
 840         fprs |= (FPRS_FEF | FPRS_DL);
 841         task_thread_info(target)->fpsaved[0] = fprs;
 842
 843         if (!ret)
 844                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 845                                                 34 * sizeof(u32), -1);
 846         return ret;
 847 }
 848
 849 static const struct user_regset sparc32_regsets[] = {
 850         /* Format is:
 851          *      G0 --> G7
 852          *      O0 --> O7
 853          *      L0 --> L7
 854          *      I0 --> I7
 855          *      PSR, PC, nPC, Y, WIM, TBR
 856          */
 857         [REGSET_GENERAL] = {
 858                 .core_note_type = NT_PRSTATUS,
 859                 .n = 38,
 860                 .size = sizeof(u32), .align = sizeof(u32),
 861                 .get = genregs32_get, .set = genregs32_set
 862         },
 863         /* Format is:
 864          *      F0 --> F31
 865          *      empty 32-bit word
 866          *      FSR (32--bit word)
 867          *      FPU QUEUE COUNT (8-bit char)
 868          *      FPU QUEUE ENTRYSIZE (8-bit char)
 869          *      FPU ENABLED (8-bit char)
 870          *      empty 8-bit char
 871          *      FPU QUEUE (64 32-bit ints)
 872          */
 873         [REGSET_FP] = {
 874                 .core_note_type = NT_PRFPREG,
 875                 .n = 99,
 876                 .size = sizeof(u32), .align = sizeof(u32),
 877                 .get = fpregs32_get, .set = fpregs32_set
 878         },
 879 };
 880
 881 static const struct user_regset_view user_sparc32_view = {
 882         .name = "sparc", .e_machine = EM_SPARC,
 883         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 884 };
 885 #endif /* CONFIG_COMPAT */
 886
 887 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 888 {
 889 #ifdef CONFIG_COMPAT
 890         if (test_tsk_thread_flag(task, TIF_32BIT))
 891                 return &user_sparc32_view;
 892 #endif
 893         return &user_sparc64_view;
 894 }
 895
 896 #ifdef CONFIG_COMPAT
 897 struct compat_fps {
 898         unsigned int regs[32];
 899         unsigned int fsr;
 900         unsigned int flags;
 901         unsigned int extra;
 902         unsigned int fpqd;
 903         struct compat_fq {
 904                 unsigned int insnaddr;
 905                 unsigned int insn;
 906         } fpq[16];
 907 };
 908
 909 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 910                         compat_ulong_t caddr, compat_ulong_t cdata)
 911 {
 912         const struct user_regset_view *view = task_user_regset_view(current);
 913         compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
 914         struct pt_regs32 __user *pregs;
 915         struct compat_fps __user *fps;
 916         unsigned long addr2 = caddr2;
 917         unsigned long addr = caddr;
 918         unsigned long data = cdata;
 919         int ret;
 920
 921         pregs = (struct pt_regs32 __user *) addr;
 922         fps = (struct compat_fps __user *) addr;
 923
 924         switch (request) {
 925         case PTRACE_PEEKUSR:
 926                 ret = (addr != 0) ? -EIO : 0;
 927                 break;
 928
 929         case PTRACE_GETREGS:
 930                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 931                                           32 * sizeof(u32),
 932                                           4 * sizeof(u32),
 933                                           &pregs->psr);
 934                 if (!ret)
 935                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 936                                                   1 * sizeof(u32),
 937                                                   15 * sizeof(u32),
 938                                                   &pregs->u_regs[0]);
 939                 break;
 940
 941         case PTRACE_SETREGS:
 942                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 943                                             32 * sizeof(u32),
 944                                             4 * sizeof(u32),
 945                                             &pregs->psr);
 946                 if (!ret)
 947                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 948                                                     1 * sizeof(u32),
 949                                                     15 * sizeof(u32),
 950                                                     &pregs->u_regs[0]);
 951                 break;
 952
 953         case PTRACE_GETFPREGS:
 954                 ret = copy_regset_to_user(child, view, REGSET_FP,
 955                                           0 * sizeof(u32),
 956                                           32 * sizeof(u32),
 957                                           &fps->regs[0]);
 958                 if (!ret)
 959                         ret = copy_regset_to_user(child, view, REGSET_FP,
 960                                                   33 * sizeof(u32),
 961                                                   1 * sizeof(u32),
 962                                                   &fps->fsr);
 963                 if (!ret) {
 964                         if (__put_user(0, &fps->flags) ||
 965                             __put_user(0, &fps->extra) ||
 966                             __put_user(0, &fps->fpqd) ||
 967                             clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
 968                                 ret = -EFAULT;
 969                 }
 970                 break;
 971
 972         case PTRACE_SETFPREGS:
 973                 ret = copy_regset_from_user(child, view, REGSET_FP,
 974                                             0 * sizeof(u32),
 975                                             32 * sizeof(u32),
 976                                             &fps->regs[0]);
 977                 if (!ret)
 978                         ret = copy_regset_from_user(child, view, REGSET_FP,
 979                                                     33 * sizeof(u32),
 980                                                     1 * sizeof(u32),
 981                                                     &fps->fsr);
 982                 break;
 983
 984         case PTRACE_READTEXT:
 985         case PTRACE_READDATA:
 986                 ret = ptrace_readdata(child, addr,
 987                                       (char __user *)addr2, data);
 988                 if (ret == data)
 989                         ret = 0;
 990                 else if (ret >= 0)
 991                         ret = -EIO;
 992                 break;
 993
 994         case PTRACE_WRITETEXT:
 995         case PTRACE_WRITEDATA:
 996                 ret = ptrace_writedata(child, (char __user *) addr2,
 997                                        addr, data);
 998                 if (ret == data)
 999                         ret = 0;
1000                 else if (ret >= 0)
1001                         ret = -EIO;
1002                 break;
1003
1004         default:
1005                 if (request == PTRACE_SPARC_DETACH)
1006                         request = PTRACE_DETACH;
1007                 ret = compat_ptrace_request(child, request, addr, data);
1008                 break;
1009         }
1010
1011         return ret;
1012 }
1013 #endif /* CONFIG_COMPAT */
1014
1015 struct fps {
1016         unsigned int regs[64];
1017         unsigned long fsr;
1018 };
1019
1020 long arch_ptrace(struct task_struct *child, long request,
1021                  unsigned long addr, unsigned long data)
1022 {
1023         const struct user_regset_view *view = task_user_regset_view(current);
1024         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
1025         struct pt_regs __user *pregs;
1026         struct fps __user *fps;
1027         void __user *addr2p;
1028         int ret;
1029
1030         pregs = (struct pt_regs __user *) addr;
1031         fps = (struct fps __user *) addr;
1032         addr2p = (void __user *) addr2;
1033
1034         switch (request) {
1035         case PTRACE_PEEKUSR:
1036                 ret = (addr != 0) ? -EIO : 0;
1037                 break;
1038
1039         case PTRACE_GETREGS64:
1040                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1041                                           1 * sizeof(u64),
1042                                           15 * sizeof(u64),
1043                                           &pregs->u_regs[0]);
1044                 if (!ret) {
1045                         /* XXX doesn't handle 'y' register correctly XXX */
1046                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1047                                                   32 * sizeof(u64),
1048                                                   4 * sizeof(u64),
1049                                                   &pregs->tstate);
1050                 }
1051                 break;
1052
1053         case PTRACE_SETREGS64:
1054                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1055                                             1 * sizeof(u64),
1056                                             15 * sizeof(u64),
1057                                             &pregs->u_regs[0]);
1058                 if (!ret) {
1059                         /* XXX doesn't handle 'y' register correctly XXX */
1060                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1061                                                     32 * sizeof(u64),
1062                                                     4 * sizeof(u64),
1063                                                     &pregs->tstate);
1064                 }
1065                 break;
1066
1067         case PTRACE_GETFPREGS64:
1068                 ret = copy_regset_to_user(child, view, REGSET_FP,
1069                                           0 * sizeof(u64),
1070                                           33 * sizeof(u64),
1071                                           fps);
1072                 break;
1073
1074         case PTRACE_SETFPREGS64:
1075                 ret = copy_regset_from_user(child, view, REGSET_FP,
1076                                           0 * sizeof(u64),
1077                                           33 * sizeof(u64),
1078                                           fps);
1079                 break;
1080
1081         case PTRACE_READTEXT:
1082         case PTRACE_READDATA:
1083                 ret = ptrace_readdata(child, addr, addr2p, data);
1084                 if (ret == data)
1085                         ret = 0;
1086                 else if (ret >= 0)
1087                         ret = -EIO;
1088                 break;
1089
1090         case PTRACE_WRITETEXT:
1091         case PTRACE_WRITEDATA:
1092                 ret = ptrace_writedata(child, addr2p, addr, data);
1093                 if (ret == data)
1094                         ret = 0;
1095                 else if (ret >= 0)
1096                         ret = -EIO;
1097                 break;
1098
1099         default:
1100                 if (request == PTRACE_SPARC_DETACH)
1101                         request = PTRACE_DETACH;
1102                 ret = ptrace_request(child, request, addr, data);
1103                 break;
1104         }
1105
1106         return ret;
1107 }
1108
1109 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1110 {
1111         int ret = 0;
1112
1113         /* do the secure computing check first */
1114         secure_computing_strict(regs->u_regs[UREG_G1]);
1115
1116         if (test_thread_flag(TIF_NOHZ))
1117                 user_exit();
1118
1119         if (test_thread_flag(TIF_SYSCALL_TRACE))
1120                 ret = tracehook_report_syscall_entry(regs);
1121
1122         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1123                 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1124
1125         audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
1126                             regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
1127                             regs->u_regs[UREG_I3]);
1128
1129         return ret;
1130 }
1131
1132 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1133 {
1134         if (test_thread_flag(TIF_NOHZ))
1135                 user_exit();
1136
1137         audit_syscall_exit(regs);
1138
1139         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1140                 trace_sys_exit(regs, regs->u_regs[UREG_I0]);
1141
1142         if (test_thread_flag(TIF_SYSCALL_TRACE))
1143                 tracehook_report_syscall_exit(regs, 0);
1144
1145         if (test_thread_flag(TIF_NOHZ))
1146                 user_enter();
1147 }
1148
1149 /**
1150  * regs_query_register_offset() - query register offset from its name
1151  * @name:       the name of a register
1152  *
1153  * regs_query_register_offset() returns the offset of a register in struct
1154  * pt_regs from its name. If the name is invalid, this returns -EINVAL;
1155  */
1156 int regs_query_register_offset(const char *name)
1157 {
1158         const struct pt_regs_offset *roff;
1159
1160         for (roff = regoffset_table; roff->name != NULL; roff++)
1161                 if (!strcmp(roff->name, name))
1162                         return roff->offset;
1163         return -EINVAL;
1164 }