arch/sparc/kernel/ptrace_64.c

   1 /* ptrace.c: Sparc process tracing support.
   2  *
   3  * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  *
   6  * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
   7  * and David Mosberger.
   8  *
   9  * Added Linux support -miguel (weird, eh?, the original code was meant
  10  * to emulate SunOS).
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/sched.h>
  15 #include <linux/mm.h>
  16 #include <linux/errno.h>
  17 #include <linux/export.h>
  18 #include <linux/ptrace.h>
  19 #include <linux/user.h>
  20 #include <linux/smp.h>
  21 #include <linux/security.h>
  22 #include <linux/seccomp.h>
  23 #include <linux/audit.h>
  24 #include <linux/signal.h>
  25 #include <linux/regset.h>
  26 #include <linux/tracehook.h>
  27 #include <trace/syscall.h>
  28 #include <linux/compat.h>
  29 #include <linux/elf.h>
  30 #include <linux/context_tracking.h>
  31
  32 #include <asm/asi.h>
  33 #include <asm/pgtable.h>
  34 #include <linux/uaccess.h>
  35 #include <asm/psrcompat.h>
  36 #include <asm/visasm.h>
  37 #include <asm/spitfire.h>
  38 #include <asm/page.h>
  39 #include <asm/cpudata.h>
  40 #include <asm/cacheflush.h>
  41
  42 #define CREATE_TRACE_POINTS
  43 #include <trace/events/syscalls.h>
  44
  45 #include "entry.h"
  46
  47 /* #define ALLOW_INIT_TRACING */
  48
  49 struct pt_regs_offset {
  50         const char *name;
  51         int offset;
  52 };
  53
  54 #define REG_OFFSET_NAME(n, r) \
  55         {.name = n, .offset = (PT_V9_##r)}
  56 #define REG_OFFSET_END {.name = NULL, .offset = 0}
  57
  58 static const struct pt_regs_offset regoffset_table[] = {
  59         REG_OFFSET_NAME("g0", G0),
  60         REG_OFFSET_NAME("g1", G1),
  61         REG_OFFSET_NAME("g2", G2),
  62         REG_OFFSET_NAME("g3", G3),
  63         REG_OFFSET_NAME("g4", G4),
  64         REG_OFFSET_NAME("g5", G5),
  65         REG_OFFSET_NAME("g6", G6),
  66         REG_OFFSET_NAME("g7", G7),
  67
  68         REG_OFFSET_NAME("i0", I0),
  69         REG_OFFSET_NAME("i1", I1),
  70         REG_OFFSET_NAME("i2", I2),
  71         REG_OFFSET_NAME("i3", I3),
  72         REG_OFFSET_NAME("i4", I4),
  73         REG_OFFSET_NAME("i5", I5),
  74         REG_OFFSET_NAME("i6", I6),
  75         REG_OFFSET_NAME("i7", I7),
  76
  77         REG_OFFSET_NAME("tstate", TSTATE),
  78         REG_OFFSET_NAME("pc", TPC),
  79         REG_OFFSET_NAME("npc", TNPC),
  80         REG_OFFSET_NAME("y", Y),
  81         REG_OFFSET_NAME("lr", I7),
  82
  83         REG_OFFSET_END,
  84 };
  85
  86 /*
  87  * Called by kernel/ptrace.c when detaching..
  88  *
  89  * Make sure single step bits etc are not set.
  90  */
  91 void ptrace_disable(struct task_struct *child)
  92 {
  93         /* nothing to do */
  94 }
  95
  96 /* To get the necessary page struct, access_process_vm() first calls
  97  * get_user_pages().  This has done a flush_dcache_page() on the
  98  * accessed page.  Then our caller (copy_{to,from}_user_page()) did
  99  * to memcpy to read/write the data from that page.
 100  *
 101  * Now, the only thing we have to do is:
 102  * 1) flush the D-cache if it's possible than an illegal alias
 103  *    has been created
 104  * 2) flush the I-cache if this is pre-cheetah and we did a write
 105  */
 106 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
 107                          unsigned long uaddr, void *kaddr,
 108                          unsigned long len, int write)
 109 {
 110         BUG_ON(len > PAGE_SIZE);
 111
 112         if (tlb_type == hypervisor)
 113                 return;
 114
 115         preempt_disable();
 116
 117 #ifdef DCACHE_ALIASING_POSSIBLE
 118         /* If bit 13 of the kernel address we used to access the
 119          * user page is the same as the virtual address that page
 120          * is mapped to in the user's address space, we can skip the
 121          * D-cache flush.
 122          */
 123         if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
 124                 unsigned long start = __pa(kaddr);
 125                 unsigned long end = start + len;
 126                 unsigned long dcache_line_size;
 127
 128                 dcache_line_size = local_cpu_data().dcache_line_size;
 129
 130                 if (tlb_type == spitfire) {
 131                         for (; start < end; start += dcache_line_size)
 132                                 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
 133                 } else {
 134                         start &= ~(dcache_line_size - 1);
 135                         for (; start < end; start += dcache_line_size)
 136                                 __asm__ __volatile__(
 137                                         "stxa %%g0, [%0] %1\n\t"
 138                                         "membar #Sync"
 139                                         : /* no outputs */
 140                                         : "r" (start),
 141                                         "i" (ASI_DCACHE_INVALIDATE));
 142                 }
 143         }
 144 #endif
 145         if (write && tlb_type == spitfire) {
 146                 unsigned long start = (unsigned long) kaddr;
 147                 unsigned long end = start + len;
 148                 unsigned long icache_line_size;
 149
 150                 icache_line_size = local_cpu_data().icache_line_size;
 151
 152                 for (; start < end; start += icache_line_size)
 153                         flushi(start);
 154         }
 155
 156         preempt_enable();
 157 }
 158 EXPORT_SYMBOL_GPL(flush_ptrace_access);
 159
 160 static int get_from_target(struct task_struct *target, unsigned long uaddr,
 161                            void *kbuf, int len)
 162 {
 163         if (target == current) {
 164                 if (copy_from_user(kbuf, (void __user *) uaddr, len))
 165                         return -EFAULT;
 166         } else {
 167                 int len2 = access_process_vm(target, uaddr, kbuf, len,
 168                                 FOLL_FORCE);
 169                 if (len2 != len)
 170                         return -EFAULT;
 171         }
 172         return 0;
 173 }
 174
 175 static int set_to_target(struct task_struct *target, unsigned long uaddr,
 176                          void *kbuf, int len)
 177 {
 178         if (target == current) {
 179                 if (copy_to_user((void __user *) uaddr, kbuf, len))
 180                         return -EFAULT;
 181         } else {
 182                 int len2 = access_process_vm(target, uaddr, kbuf, len,
 183                                 FOLL_FORCE | FOLL_WRITE);
 184                 if (len2 != len)
 185                         return -EFAULT;
 186         }
 187         return 0;
 188 }
 189
 190 static int regwindow64_get(struct task_struct *target,
 191                            const struct pt_regs *regs,
 192                            struct reg_window *wbuf)
 193 {
 194         unsigned long rw_addr = regs->u_regs[UREG_I6];
 195
 196         if (!test_thread_64bit_stack(rw_addr)) {
 197                 struct reg_window32 win32;
 198                 int i;
 199
 200                 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
 201                         return -EFAULT;
 202                 for (i = 0; i < 8; i++)
 203                         wbuf->locals[i] = win32.locals[i];
 204                 for (i = 0; i < 8; i++)
 205                         wbuf->ins[i] = win32.ins[i];
 206         } else {
 207                 rw_addr += STACK_BIAS;
 208                 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 209                         return -EFAULT;
 210         }
 211
 212         return 0;
 213 }
 214
 215 static int regwindow64_set(struct task_struct *target,
 216                            const struct pt_regs *regs,
 217                            struct reg_window *wbuf)
 218 {
 219         unsigned long rw_addr = regs->u_regs[UREG_I6];
 220
 221         if (!test_thread_64bit_stack(rw_addr)) {
 222                 struct reg_window32 win32;
 223                 int i;
 224
 225                 for (i = 0; i < 8; i++)
 226                         win32.locals[i] = wbuf->locals[i];
 227                 for (i = 0; i < 8; i++)
 228                         win32.ins[i] = wbuf->ins[i];
 229
 230                 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
 231                         return -EFAULT;
 232         } else {
 233                 rw_addr += STACK_BIAS;
 234                 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
 235                         return -EFAULT;
 236         }
 237
 238         return 0;
 239 }
 240
 241 enum sparc_regset {
 242         REGSET_GENERAL,
 243         REGSET_FP,
 244 };
 245
 246 static int genregs64_get(struct task_struct *target,
 247                          const struct user_regset *regset,
 248                          unsigned int pos, unsigned int count,
 249                          void *kbuf, void __user *ubuf)
 250 {
 251         const struct pt_regs *regs = task_pt_regs(target);
 252         int ret;
 253
 254         if (target == current)
 255                 flushw_user();
 256
 257         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 258                                   regs->u_regs,
 259                                   0, 16 * sizeof(u64));
 260         if (!ret && count && pos < (32 * sizeof(u64))) {
 261                 struct reg_window window;
 262
 263                 if (regwindow64_get(target, regs, &window))
 264                         return -EFAULT;
 265                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 266                                           &window,
 267                                           16 * sizeof(u64),
 268                                           32 * sizeof(u64));
 269         }
 270
 271         if (!ret) {
 272                 /* TSTATE, TPC, TNPC */
 273                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 274                                           &regs->tstate,
 275                                           32 * sizeof(u64),
 276                                           35 * sizeof(u64));
 277         }
 278
 279         if (!ret) {
 280                 unsigned long y = regs->y;
 281
 282                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 283                                           &y,
 284                                           35 * sizeof(u64),
 285                                           36 * sizeof(u64));
 286         }
 287
 288         if (!ret) {
 289                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 290                                                36 * sizeof(u64), -1);
 291
 292         }
 293         return ret;
 294 }
 295
 296 static int genregs64_set(struct task_struct *target,
 297                          const struct user_regset *regset,
 298                          unsigned int pos, unsigned int count,
 299                          const void *kbuf, const void __user *ubuf)
 300 {
 301         struct pt_regs *regs = task_pt_regs(target);
 302         int ret;
 303
 304         if (target == current)
 305                 flushw_user();
 306
 307         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 308                                  regs->u_regs,
 309                                  0, 16 * sizeof(u64));
 310         if (!ret && count && pos < (32 * sizeof(u64))) {
 311                 struct reg_window window;
 312
 313                 if (regwindow64_get(target, regs, &window))
 314                         return -EFAULT;
 315
 316                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 317                                          &window,
 318                                          16 * sizeof(u64),
 319                                          32 * sizeof(u64));
 320
 321                 if (!ret &&
 322                     regwindow64_set(target, regs, &window))
 323                         return -EFAULT;
 324         }
 325
 326         if (!ret && count > 0) {
 327                 unsigned long tstate;
 328
 329                 /* TSTATE */
 330                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 331                                          &tstate,
 332                                          32 * sizeof(u64),
 333                                          33 * sizeof(u64));
 334                 if (!ret) {
 335                         /* Only the condition codes and the "in syscall"
 336                          * state can be modified in the %tstate register.
 337                          */
 338                         tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 339                         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 340                         regs->tstate |= tstate;
 341                 }
 342         }
 343
 344         if (!ret) {
 345                 /* TPC, TNPC */
 346                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 347                                          &regs->tpc,
 348                                          33 * sizeof(u64),
 349                                          35 * sizeof(u64));
 350         }
 351
 352         if (!ret) {
 353                 unsigned long y;
 354
 355                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 356                                          &y,
 357                                          35 * sizeof(u64),
 358                                          36 * sizeof(u64));
 359                 if (!ret)
 360                         regs->y = y;
 361         }
 362
 363         if (!ret)
 364                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 365                                                 36 * sizeof(u64), -1);
 366
 367         return ret;
 368 }
 369
 370 static int fpregs64_get(struct task_struct *target,
 371                         const struct user_regset *regset,
 372                         unsigned int pos, unsigned int count,
 373                         void *kbuf, void __user *ubuf)
 374 {
 375         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 376         unsigned long fprs, fsr, gsr;
 377         int ret;
 378
 379         if (target == current)
 380                 save_and_clear_fpu();
 381
 382         fprs = task_thread_info(target)->fpsaved[0];
 383
 384         if (fprs & FPRS_DL)
 385                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 386                                           fpregs,
 387                                           0, 16 * sizeof(u64));
 388         else
 389                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 390                                                0,
 391                                                16 * sizeof(u64));
 392
 393         if (!ret) {
 394                 if (fprs & FPRS_DU)
 395                         ret = user_regset_copyout(&pos, &count,
 396                                                   &kbuf, &ubuf,
 397                                                   fpregs + 16,
 398                                                   16 * sizeof(u64),
 399                                                   32 * sizeof(u64));
 400                 else
 401                         ret = user_regset_copyout_zero(&pos, &count,
 402                                                        &kbuf, &ubuf,
 403                                                        16 * sizeof(u64),
 404                                                        32 * sizeof(u64));
 405         }
 406
 407         if (fprs & FPRS_FEF) {
 408                 fsr = task_thread_info(target)->xfsr[0];
 409                 gsr = task_thread_info(target)->gsr[0];
 410         } else {
 411                 fsr = gsr = 0;
 412         }
 413
 414         if (!ret)
 415                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 416                                           &fsr,
 417                                           32 * sizeof(u64),
 418                                           33 * sizeof(u64));
 419         if (!ret)
 420                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 421                                           &gsr,
 422                                           33 * sizeof(u64),
 423                                           34 * sizeof(u64));
 424         if (!ret)
 425                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 426                                           &fprs,
 427                                           34 * sizeof(u64),
 428                                           35 * sizeof(u64));
 429
 430         if (!ret)
 431                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 432                                                35 * sizeof(u64), -1);
 433
 434         return ret;
 435 }
 436
 437 static int fpregs64_set(struct task_struct *target,
 438                         const struct user_regset *regset,
 439                         unsigned int pos, unsigned int count,
 440                         const void *kbuf, const void __user *ubuf)
 441 {
 442         unsigned long *fpregs = task_thread_info(target)->fpregs;
 443         unsigned long fprs;
 444         int ret;
 445
 446         if (target == current)
 447                 save_and_clear_fpu();
 448
 449         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 450                                  fpregs,
 451                                  0, 32 * sizeof(u64));
 452         if (!ret)
 453                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 454                                          task_thread_info(target)->xfsr,
 455                                          32 * sizeof(u64),
 456                                          33 * sizeof(u64));
 457         if (!ret)
 458                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 459                                          task_thread_info(target)->gsr,
 460                                          33 * sizeof(u64),
 461                                          34 * sizeof(u64));
 462
 463         fprs = task_thread_info(target)->fpsaved[0];
 464         if (!ret && count > 0) {
 465                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 466                                          &fprs,
 467                                          34 * sizeof(u64),
 468                                          35 * sizeof(u64));
 469         }
 470
 471         fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 472         task_thread_info(target)->fpsaved[0] = fprs;
 473
 474         if (!ret)
 475                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 476                                                 35 * sizeof(u64), -1);
 477         return ret;
 478 }
 479
 480 static const struct user_regset sparc64_regsets[] = {
 481         /* Format is:
 482          *      G0 --> G7
 483          *      O0 --> O7
 484          *      L0 --> L7
 485          *      I0 --> I7
 486          *      TSTATE, TPC, TNPC, Y
 487          */
 488         [REGSET_GENERAL] = {
 489                 .core_note_type = NT_PRSTATUS,
 490                 .n = 36,
 491                 .size = sizeof(u64), .align = sizeof(u64),
 492                 .get = genregs64_get, .set = genregs64_set
 493         },
 494         /* Format is:
 495          *      F0 --> F63
 496          *      FSR
 497          *      GSR
 498          *      FPRS
 499          */
 500         [REGSET_FP] = {
 501                 .core_note_type = NT_PRFPREG,
 502                 .n = 35,
 503                 .size = sizeof(u64), .align = sizeof(u64),
 504                 .get = fpregs64_get, .set = fpregs64_set
 505         },
 506 };
 507
 508 static const struct user_regset_view user_sparc64_view = {
 509         .name = "sparc64", .e_machine = EM_SPARCV9,
 510         .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
 511 };
 512
 513 #ifdef CONFIG_COMPAT
 514 static int genregs32_get(struct task_struct *target,
 515                          const struct user_regset *regset,
 516                          unsigned int pos, unsigned int count,
 517                          void *kbuf, void __user *ubuf)
 518 {
 519         const struct pt_regs *regs = task_pt_regs(target);
 520         compat_ulong_t __user *reg_window;
 521         compat_ulong_t *k = kbuf;
 522         compat_ulong_t __user *u = ubuf;
 523         compat_ulong_t reg;
 524
 525         if (target == current)
 526                 flushw_user();
 527
 528         pos /= sizeof(reg);
 529         count /= sizeof(reg);
 530
 531         if (kbuf) {
 532                 for (; count > 0 && pos < 16; count--)
 533                         *k++ = regs->u_regs[pos++];
 534
 535                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 536                 reg_window -= 16;
 537                 if (target == current) {
 538                         for (; count > 0 && pos < 32; count--) {
 539                                 if (get_user(*k++, &reg_window[pos++]))
 540                                         return -EFAULT;
 541                         }
 542                 } else {
 543                         for (; count > 0 && pos < 32; count--) {
 544                                 if (access_process_vm(target,
 545                                                       (unsigned long)
 546                                                       &reg_window[pos],
 547                                                       k, sizeof(*k),
 548                                                       FOLL_FORCE)
 549                                     != sizeof(*k))
 550                                         return -EFAULT;
 551                                 k++;
 552                                 pos++;
 553                         }
 554                 }
 555         } else {
 556                 for (; count > 0 && pos < 16; count--) {
 557                         if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
 558                                 return -EFAULT;
 559                 }
 560
 561                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 562                 reg_window -= 16;
 563                 if (target == current) {
 564                         for (; count > 0 && pos < 32; count--) {
 565                                 if (get_user(reg, &reg_window[pos++]) ||
 566                                     put_user(reg, u++))
 567                                         return -EFAULT;
 568                         }
 569                 } else {
 570                         for (; count > 0 && pos < 32; count--) {
 571                                 if (access_process_vm(target,
 572                                                       (unsigned long)
 573                                                       &reg_window[pos],
 574                                                       &reg, sizeof(reg),
 575                                                       FOLL_FORCE)
 576                                     != sizeof(reg))
 577                                         return -EFAULT;
 578                                 if (access_process_vm(target,
 579                                                       (unsigned long) u,
 580                                                       &reg, sizeof(reg),
 581                                                       FOLL_FORCE | FOLL_WRITE)
 582                                     != sizeof(reg))
 583                                         return -EFAULT;
 584                                 pos++;
 585                                 u++;
 586                         }
 587                 }
 588         }
 589         while (count > 0) {
 590                 switch (pos) {
 591                 case 32: /* PSR */
 592                         reg = tstate_to_psr(regs->tstate);
 593                         break;
 594                 case 33: /* PC */
 595                         reg = regs->tpc;
 596                         break;
 597                 case 34: /* NPC */
 598                         reg = regs->tnpc;
 599                         break;
 600                 case 35: /* Y */
 601                         reg = regs->y;
 602                         break;
 603                 case 36: /* WIM */
 604                 case 37: /* TBR */
 605                         reg = 0;
 606                         break;
 607                 default:
 608                         goto finish;
 609                 }
 610
 611                 if (kbuf)
 612                         *k++ = reg;
 613                 else if (put_user(reg, u++))
 614                         return -EFAULT;
 615                 pos++;
 616                 count--;
 617         }
 618 finish:
 619         pos *= sizeof(reg);
 620         count *= sizeof(reg);
 621
 622         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 623                                         38 * sizeof(reg), -1);
 624 }
 625
 626 static int genregs32_set(struct task_struct *target,
 627                          const struct user_regset *regset,
 628                          unsigned int pos, unsigned int count,
 629                          const void *kbuf, const void __user *ubuf)
 630 {
 631         struct pt_regs *regs = task_pt_regs(target);
 632         compat_ulong_t __user *reg_window;
 633         const compat_ulong_t *k = kbuf;
 634         const compat_ulong_t __user *u = ubuf;
 635         compat_ulong_t reg;
 636
 637         if (target == current)
 638                 flushw_user();
 639
 640         pos /= sizeof(reg);
 641         count /= sizeof(reg);
 642
 643         if (kbuf) {
 644                 for (; count > 0 && pos < 16; count--)
 645                         regs->u_regs[pos++] = *k++;
 646
 647                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 648                 reg_window -= 16;
 649                 if (target == current) {
 650                         for (; count > 0 && pos < 32; count--) {
 651                                 if (put_user(*k++, &reg_window[pos++]))
 652                                         return -EFAULT;
 653                         }
 654                 } else {
 655                         for (; count > 0 && pos < 32; count--) {
 656                                 if (access_process_vm(target,
 657                                                       (unsigned long)
 658                                                       &reg_window[pos],
 659                                                       (void *) k,
 660                                                       sizeof(*k),
 661                                                       FOLL_FORCE | FOLL_WRITE)
 662                                     != sizeof(*k))
 663                                         return -EFAULT;
 664                                 k++;
 665                                 pos++;
 666                         }
 667                 }
 668         } else {
 669                 for (; count > 0 && pos < 16; count--) {
 670                         if (get_user(reg, u++))
 671                                 return -EFAULT;
 672                         regs->u_regs[pos++] = reg;
 673                 }
 674
 675                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 676                 reg_window -= 16;
 677                 if (target == current) {
 678                         for (; count > 0 && pos < 32; count--) {
 679                                 if (get_user(reg, u++) ||
 680                                     put_user(reg, &reg_window[pos++]))
 681                                         return -EFAULT;
 682                         }
 683                 } else {
 684                         for (; count > 0 && pos < 32; count--) {
 685                                 if (access_process_vm(target,
 686                                                       (unsigned long)
 687                                                       u,
 688                                                       &reg, sizeof(reg),
 689                                                       FOLL_FORCE)
 690                                     != sizeof(reg))
 691                                         return -EFAULT;
 692                                 if (access_process_vm(target,
 693                                                       (unsigned long)
 694                                                       &reg_window[pos],
 695                                                       &reg, sizeof(reg),
 696                                                       FOLL_FORCE | FOLL_WRITE)
 697                                     != sizeof(reg))
 698                                         return -EFAULT;
 699                                 pos++;
 700                                 u++;
 701                         }
 702                 }
 703         }
 704         while (count > 0) {
 705                 unsigned long tstate;
 706
 707                 if (kbuf)
 708                         reg = *k++;
 709                 else if (get_user(reg, u++))
 710                         return -EFAULT;
 711
 712                 switch (pos) {
 713                 case 32: /* PSR */
 714                         tstate = regs->tstate;
 715                         tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 716                         tstate |= psr_to_tstate_icc(reg);
 717                         if (reg & PSR_SYSCALL)
 718                                 tstate |= TSTATE_SYSCALL;
 719                         regs->tstate = tstate;
 720                         break;
 721                 case 33: /* PC */
 722                         regs->tpc = reg;
 723                         break;
 724                 case 34: /* NPC */
 725                         regs->tnpc = reg;
 726                         break;
 727                 case 35: /* Y */
 728                         regs->y = reg;
 729                         break;
 730                 case 36: /* WIM */
 731                 case 37: /* TBR */
 732                         break;
 733                 default:
 734                         goto finish;
 735                 }
 736
 737                 pos++;
 738                 count--;
 739         }
 740 finish:
 741         pos *= sizeof(reg);
 742         count *= sizeof(reg);
 743
 744         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 745                                          38 * sizeof(reg), -1);
 746 }
 747
 748 static int fpregs32_get(struct task_struct *target,
 749                         const struct user_regset *regset,
 750                         unsigned int pos, unsigned int count,
 751                         void *kbuf, void __user *ubuf)
 752 {
 753         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 754         compat_ulong_t enabled;
 755         unsigned long fprs;
 756         compat_ulong_t fsr;
 757         int ret = 0;
 758
 759         if (target == current)
 760                 save_and_clear_fpu();
 761
 762         fprs = task_thread_info(target)->fpsaved[0];
 763         if (fprs & FPRS_FEF) {
 764                 fsr = task_thread_info(target)->xfsr[0];
 765                 enabled = 1;
 766         } else {
 767                 fsr = 0;
 768                 enabled = 0;
 769         }
 770
 771         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 772                                   fpregs,
 773                                   0, 32 * sizeof(u32));
 774
 775         if (!ret)
 776                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 777                                                32 * sizeof(u32),
 778                                                33 * sizeof(u32));
 779         if (!ret)
 780                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 781                                           &fsr,
 782                                           33 * sizeof(u32),
 783                                           34 * sizeof(u32));
 784
 785         if (!ret) {
 786                 compat_ulong_t val;
 787
 788                 val = (enabled << 8) | (8 << 16);
 789                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 790                                           &val,
 791                                           34 * sizeof(u32),
 792                                           35 * sizeof(u32));
 793         }
 794
 795         if (!ret)
 796                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 797                                                35 * sizeof(u32), -1);
 798
 799         return ret;
 800 }
 801
 802 static int fpregs32_set(struct task_struct *target,
 803                         const struct user_regset *regset,
 804                         unsigned int pos, unsigned int count,
 805                         const void *kbuf, const void __user *ubuf)
 806 {
 807         unsigned long *fpregs = task_thread_info(target)->fpregs;
 808         unsigned long fprs;
 809         int ret;
 810
 811         if (target == current)
 812                 save_and_clear_fpu();
 813
 814         fprs = task_thread_info(target)->fpsaved[0];
 815
 816         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 817                                  fpregs,
 818                                  0, 32 * sizeof(u32));
 819         if (!ret)
 820                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 821                                           32 * sizeof(u32),
 822                                           33 * sizeof(u32));
 823         if (!ret && count > 0) {
 824                 compat_ulong_t fsr;
 825                 unsigned long val;
 826
 827                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 828                                          &fsr,
 829                                          33 * sizeof(u32),
 830                                          34 * sizeof(u32));
 831                 if (!ret) {
 832                         val = task_thread_info(target)->xfsr[0];
 833                         val &= 0xffffffff00000000UL;
 834                         val |= fsr;
 835                         task_thread_info(target)->xfsr[0] = val;
 836                 }
 837         }
 838
 839         fprs |= (FPRS_FEF | FPRS_DL);
 840         task_thread_info(target)->fpsaved[0] = fprs;
 841
 842         if (!ret)
 843                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 844                                                 34 * sizeof(u32), -1);
 845         return ret;
 846 }
 847
 848 static const struct user_regset sparc32_regsets[] = {
 849         /* Format is:
 850          *      G0 --> G7
 851          *      O0 --> O7
 852          *      L0 --> L7
 853          *      I0 --> I7
 854          *      PSR, PC, nPC, Y, WIM, TBR
 855          */
 856         [REGSET_GENERAL] = {
 857                 .core_note_type = NT_PRSTATUS,
 858                 .n = 38,
 859                 .size = sizeof(u32), .align = sizeof(u32),
 860                 .get = genregs32_get, .set = genregs32_set
 861         },
 862         /* Format is:
 863          *      F0 --> F31
 864          *      empty 32-bit word
 865          *      FSR (32--bit word)
 866          *      FPU QUEUE COUNT (8-bit char)
 867          *      FPU QUEUE ENTRYSIZE (8-bit char)
 868          *      FPU ENABLED (8-bit char)
 869          *      empty 8-bit char
 870          *      FPU QUEUE (64 32-bit ints)
 871          */
 872         [REGSET_FP] = {
 873                 .core_note_type = NT_PRFPREG,
 874                 .n = 99,
 875                 .size = sizeof(u32), .align = sizeof(u32),
 876                 .get = fpregs32_get, .set = fpregs32_set
 877         },
 878 };
 879
 880 static const struct user_regset_view user_sparc32_view = {
 881         .name = "sparc", .e_machine = EM_SPARC,
 882         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 883 };
 884 #endif /* CONFIG_COMPAT */
 885
 886 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 887 {
 888 #ifdef CONFIG_COMPAT
 889         if (test_tsk_thread_flag(task, TIF_32BIT))
 890                 return &user_sparc32_view;
 891 #endif
 892         return &user_sparc64_view;
 893 }
 894
 895 #ifdef CONFIG_COMPAT
 896 struct compat_fps {
 897         unsigned int regs[32];
 898         unsigned int fsr;
 899         unsigned int flags;
 900         unsigned int extra;
 901         unsigned int fpqd;
 902         struct compat_fq {
 903                 unsigned int insnaddr;
 904                 unsigned int insn;
 905         } fpq[16];
 906 };
 907
 908 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 909                         compat_ulong_t caddr, compat_ulong_t cdata)
 910 {
 911         const struct user_regset_view *view = task_user_regset_view(current);
 912         compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
 913         struct pt_regs32 __user *pregs;
 914         struct compat_fps __user *fps;
 915         unsigned long addr2 = caddr2;
 916         unsigned long addr = caddr;
 917         unsigned long data = cdata;
 918         int ret;
 919
 920         pregs = (struct pt_regs32 __user *) addr;
 921         fps = (struct compat_fps __user *) addr;
 922
 923         switch (request) {
 924         case PTRACE_PEEKUSR:
 925                 ret = (addr != 0) ? -EIO : 0;
 926                 break;
 927
 928         case PTRACE_GETREGS:
 929                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 930                                           32 * sizeof(u32),
 931                                           4 * sizeof(u32),
 932                                           &pregs->psr);
 933                 if (!ret)
 934                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 935                                                   1 * sizeof(u32),
 936                                                   15 * sizeof(u32),
 937                                                   &pregs->u_regs[0]);
 938                 break;
 939
 940         case PTRACE_SETREGS:
 941                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 942                                             32 * sizeof(u32),
 943                                             4 * sizeof(u32),
 944                                             &pregs->psr);
 945                 if (!ret)
 946                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 947                                                     1 * sizeof(u32),
 948                                                     15 * sizeof(u32),
 949                                                     &pregs->u_regs[0]);
 950                 break;
 951
 952         case PTRACE_GETFPREGS:
 953                 ret = copy_regset_to_user(child, view, REGSET_FP,
 954                                           0 * sizeof(u32),
 955                                           32 * sizeof(u32),
 956                                           &fps->regs[0]);
 957                 if (!ret)
 958                         ret = copy_regset_to_user(child, view, REGSET_FP,
 959                                                   33 * sizeof(u32),
 960                                                   1 * sizeof(u32),
 961                                                   &fps->fsr);
 962                 if (!ret) {
 963                         if (__put_user(0, &fps->flags) ||
 964                             __put_user(0, &fps->extra) ||
 965                             __put_user(0, &fps->fpqd) ||
 966                             clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
 967                                 ret = -EFAULT;
 968                 }
 969                 break;
 970
 971         case PTRACE_SETFPREGS:
 972                 ret = copy_regset_from_user(child, view, REGSET_FP,
 973                                             0 * sizeof(u32),
 974                                             32 * sizeof(u32),
 975                                             &fps->regs[0]);
 976                 if (!ret)
 977                         ret = copy_regset_from_user(child, view, REGSET_FP,
 978                                                     33 * sizeof(u32),
 979                                                     1 * sizeof(u32),
 980                                                     &fps->fsr);
 981                 break;
 982
 983         case PTRACE_READTEXT:
 984         case PTRACE_READDATA:
 985                 ret = ptrace_readdata(child, addr,
 986                                       (char __user *)addr2, data);
 987                 if (ret == data)
 988                         ret = 0;
 989                 else if (ret >= 0)
 990                         ret = -EIO;
 991                 break;
 992
 993         case PTRACE_WRITETEXT:
 994         case PTRACE_WRITEDATA:
 995                 ret = ptrace_writedata(child, (char __user *) addr2,
 996                                        addr, data);
 997                 if (ret == data)
 998                         ret = 0;
 999                 else if (ret >= 0)
1000                         ret = -EIO;
1001                 break;
1002
1003         default:
1004                 if (request == PTRACE_SPARC_DETACH)
1005                         request = PTRACE_DETACH;
1006                 ret = compat_ptrace_request(child, request, addr, data);
1007                 break;
1008         }
1009
1010         return ret;
1011 }
1012 #endif /* CONFIG_COMPAT */
1013
1014 struct fps {
1015         unsigned int regs[64];
1016         unsigned long fsr;
1017 };
1018
1019 long arch_ptrace(struct task_struct *child, long request,
1020                  unsigned long addr, unsigned long data)
1021 {
1022         const struct user_regset_view *view = task_user_regset_view(current);
1023         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
1024         struct pt_regs __user *pregs;
1025         struct fps __user *fps;
1026         void __user *addr2p;
1027         int ret;
1028
1029         pregs = (struct pt_regs __user *) addr;
1030         fps = (struct fps __user *) addr;
1031         addr2p = (void __user *) addr2;
1032
1033         switch (request) {
1034         case PTRACE_PEEKUSR:
1035                 ret = (addr != 0) ? -EIO : 0;
1036                 break;
1037
1038         case PTRACE_GETREGS64:
1039                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1040                                           1 * sizeof(u64),
1041                                           15 * sizeof(u64),
1042                                           &pregs->u_regs[0]);
1043                 if (!ret) {
1044                         /* XXX doesn't handle 'y' register correctly XXX */
1045                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1046                                                   32 * sizeof(u64),
1047                                                   4 * sizeof(u64),
1048                                                   &pregs->tstate);
1049                 }
1050                 break;
1051
1052         case PTRACE_SETREGS64:
1053                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1054                                             1 * sizeof(u64),
1055                                             15 * sizeof(u64),
1056                                             &pregs->u_regs[0]);
1057                 if (!ret) {
1058                         /* XXX doesn't handle 'y' register correctly XXX */
1059                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1060                                                     32 * sizeof(u64),
1061                                                     4 * sizeof(u64),
1062                                                     &pregs->tstate);
1063                 }
1064                 break;
1065
1066         case PTRACE_GETFPREGS64:
1067                 ret = copy_regset_to_user(child, view, REGSET_FP,
1068                                           0 * sizeof(u64),
1069                                           33 * sizeof(u64),
1070                                           fps);
1071                 break;
1072
1073         case PTRACE_SETFPREGS64:
1074                 ret = copy_regset_from_user(child, view, REGSET_FP,
1075                                           0 * sizeof(u64),
1076                                           33 * sizeof(u64),
1077                                           fps);
1078                 break;
1079
1080         case PTRACE_READTEXT:
1081         case PTRACE_READDATA:
1082                 ret = ptrace_readdata(child, addr, addr2p, data);
1083                 if (ret == data)
1084                         ret = 0;
1085                 else if (ret >= 0)
1086                         ret = -EIO;
1087                 break;
1088
1089         case PTRACE_WRITETEXT:
1090         case PTRACE_WRITEDATA:
1091                 ret = ptrace_writedata(child, addr2p, addr, data);
1092                 if (ret == data)
1093                         ret = 0;
1094                 else if (ret >= 0)
1095                         ret = -EIO;
1096                 break;
1097
1098         default:
1099                 if (request == PTRACE_SPARC_DETACH)
1100                         request = PTRACE_DETACH;
1101                 ret = ptrace_request(child, request, addr, data);
1102                 break;
1103         }
1104
1105         return ret;
1106 }
1107
1108 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1109 {
1110         int ret = 0;
1111
1112         /* do the secure computing check first */
1113         secure_computing_strict(regs->u_regs[UREG_G1]);
1114
1115         if (test_thread_flag(TIF_NOHZ))
1116                 user_exit();
1117
1118         if (test_thread_flag(TIF_SYSCALL_TRACE))
1119                 ret = tracehook_report_syscall_entry(regs);
1120
1121         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1122                 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1123
1124         audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
1125                             regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
1126                             regs->u_regs[UREG_I3]);
1127
1128         return ret;
1129 }
1130
1131 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1132 {
1133         if (test_thread_flag(TIF_NOHZ))
1134                 user_exit();
1135
1136         audit_syscall_exit(regs);
1137
1138         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1139                 trace_sys_exit(regs, regs->u_regs[UREG_I0]);
1140
1141         if (test_thread_flag(TIF_SYSCALL_TRACE))
1142                 tracehook_report_syscall_exit(regs, 0);
1143
1144         if (test_thread_flag(TIF_NOHZ))
1145                 user_enter();
1146 }
1147
1148 /**
1149  * regs_query_register_offset() - query register offset from its name
1150  * @name:       the name of a register
1151  *
1152  * regs_query_register_offset() returns the offset of a register in struct
1153  * pt_regs from its name. If the name is invalid, this returns -EINVAL;
1154  */
1155 int regs_query_register_offset(const char *name)
1156 {
1157         const struct pt_regs_offset *roff;
1158
1159         for (roff = regoffset_table; roff->name != NULL; roff++)
1160                 if (!strcmp(roff->name, name))
1161                         return roff->offset;
1162         return -EINVAL;
1163 }