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/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 = regs->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 (put_user(reg, u++))
 580                                         return -EFAULT;
 581                         }
 582                 }
 583         }
 584         while (count > 0) {
 585                 switch (pos) {
 586                 case 32: /* PSR */
 587                         reg = tstate_to_psr(regs->tstate);
 588                         break;
 589                 case 33: /* PC */
 590                         reg = regs->tpc;
 591                         break;
 592                 case 34: /* NPC */
 593                         reg = regs->tnpc;
 594                         break;
 595                 case 35: /* Y */
 596                         reg = regs->y;
 597                         break;
 598                 case 36: /* WIM */
 599                 case 37: /* TBR */
 600                         reg = 0;
 601                         break;
 602                 default:
 603                         goto finish;
 604                 }
 605
 606                 if (kbuf)
 607                         *k++ = reg;
 608                 else if (put_user(reg, u++))
 609                         return -EFAULT;
 610                 pos++;
 611                 count--;
 612         }
 613 finish:
 614         pos *= sizeof(reg);
 615         count *= sizeof(reg);
 616
 617         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 618                                         38 * sizeof(reg), -1);
 619 }
 620
 621 static int genregs32_set(struct task_struct *target,
 622                          const struct user_regset *regset,
 623                          unsigned int pos, unsigned int count,
 624                          const void *kbuf, const void __user *ubuf)
 625 {
 626         struct pt_regs *regs = task_pt_regs(target);
 627         compat_ulong_t __user *reg_window;
 628         const compat_ulong_t *k = kbuf;
 629         const compat_ulong_t __user *u = ubuf;
 630         compat_ulong_t reg;
 631
 632         if (target == current)
 633                 flushw_user();
 634
 635         pos /= sizeof(reg);
 636         count /= sizeof(reg);
 637
 638         if (kbuf) {
 639                 for (; count > 0 && pos < 16; count--)
 640                         regs->u_regs[pos++] = *k++;
 641
 642                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 643                 reg_window -= 16;
 644                 if (target == current) {
 645                         for (; count > 0 && pos < 32; count--) {
 646                                 if (put_user(*k++, &reg_window[pos++]))
 647                                         return -EFAULT;
 648                         }
 649                 } else {
 650                         for (; count > 0 && pos < 32; count--) {
 651                                 if (access_process_vm(target,
 652                                                       (unsigned long)
 653                                                       &reg_window[pos],
 654                                                       (void *) k,
 655                                                       sizeof(*k),
 656                                                       FOLL_FORCE | FOLL_WRITE)
 657                                     != sizeof(*k))
 658                                         return -EFAULT;
 659                                 k++;
 660                                 pos++;
 661                         }
 662                 }
 663         } else {
 664                 for (; count > 0 && pos < 16; count--) {
 665                         if (get_user(reg, u++))
 666                                 return -EFAULT;
 667                         regs->u_regs[pos++] = reg;
 668                 }
 669
 670                 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
 671                 reg_window -= 16;
 672                 if (target == current) {
 673                         for (; count > 0 && pos < 32; count--) {
 674                                 if (get_user(reg, u++) ||
 675                                     put_user(reg, &reg_window[pos++]))
 676                                         return -EFAULT;
 677                         }
 678                 } else {
 679                         for (; count > 0 && pos < 32; count--) {
 680                                 if (get_user(reg, u++))
 681                                         return -EFAULT;
 682                                 if (access_process_vm(target,
 683                                                       (unsigned long)
 684                                                       &reg_window[pos],
 685                                                       &reg, sizeof(reg),
 686                                                       FOLL_FORCE | FOLL_WRITE)
 687                                     != sizeof(reg))
 688                                         return -EFAULT;
 689                                 pos++;
 690                                 u++;
 691                         }
 692                 }
 693         }
 694         while (count > 0) {
 695                 unsigned long tstate;
 696
 697                 if (kbuf)
 698                         reg = *k++;
 699                 else if (get_user(reg, u++))
 700                         return -EFAULT;
 701
 702                 switch (pos) {
 703                 case 32: /* PSR */
 704                         tstate = regs->tstate;
 705                         tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
 706                         tstate |= psr_to_tstate_icc(reg);
 707                         if (reg & PSR_SYSCALL)
 708                                 tstate |= TSTATE_SYSCALL;
 709                         regs->tstate = tstate;
 710                         break;
 711                 case 33: /* PC */
 712                         regs->tpc = reg;
 713                         break;
 714                 case 34: /* NPC */
 715                         regs->tnpc = reg;
 716                         break;
 717                 case 35: /* Y */
 718                         regs->y = reg;
 719                         break;
 720                 case 36: /* WIM */
 721                 case 37: /* TBR */
 722                         break;
 723                 default:
 724                         goto finish;
 725                 }
 726
 727                 pos++;
 728                 count--;
 729         }
 730 finish:
 731         pos *= sizeof(reg);
 732         count *= sizeof(reg);
 733
 734         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 735                                          38 * sizeof(reg), -1);
 736 }
 737
 738 static int fpregs32_get(struct task_struct *target,
 739                         const struct user_regset *regset,
 740                         unsigned int pos, unsigned int count,
 741                         void *kbuf, void __user *ubuf)
 742 {
 743         const unsigned long *fpregs = task_thread_info(target)->fpregs;
 744         compat_ulong_t enabled;
 745         unsigned long fprs;
 746         compat_ulong_t fsr;
 747         int ret = 0;
 748
 749         if (target == current)
 750                 save_and_clear_fpu();
 751
 752         fprs = task_thread_info(target)->fpsaved[0];
 753         if (fprs & FPRS_FEF) {
 754                 fsr = task_thread_info(target)->xfsr[0];
 755                 enabled = 1;
 756         } else {
 757                 fsr = 0;
 758                 enabled = 0;
 759         }
 760
 761         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 762                                   fpregs,
 763                                   0, 32 * sizeof(u32));
 764
 765         if (!ret)
 766                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 767                                                32 * sizeof(u32),
 768                                                33 * sizeof(u32));
 769         if (!ret)
 770                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 771                                           &fsr,
 772                                           33 * sizeof(u32),
 773                                           34 * sizeof(u32));
 774
 775         if (!ret) {
 776                 compat_ulong_t val;
 777
 778                 val = (enabled << 8) | (8 << 16);
 779                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 780                                           &val,
 781                                           34 * sizeof(u32),
 782                                           35 * sizeof(u32));
 783         }
 784
 785         if (!ret)
 786                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 787                                                35 * sizeof(u32), -1);
 788
 789         return ret;
 790 }
 791
 792 static int fpregs32_set(struct task_struct *target,
 793                         const struct user_regset *regset,
 794                         unsigned int pos, unsigned int count,
 795                         const void *kbuf, const void __user *ubuf)
 796 {
 797         unsigned long *fpregs = task_thread_info(target)->fpregs;
 798         unsigned long fprs;
 799         int ret;
 800
 801         if (target == current)
 802                 save_and_clear_fpu();
 803
 804         fprs = task_thread_info(target)->fpsaved[0];
 805
 806         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 807                                  fpregs,
 808                                  0, 32 * sizeof(u32));
 809         if (!ret)
 810                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 811                                           32 * sizeof(u32),
 812                                           33 * sizeof(u32));
 813         if (!ret && count > 0) {
 814                 compat_ulong_t fsr;
 815                 unsigned long val;
 816
 817                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 818                                          &fsr,
 819                                          33 * sizeof(u32),
 820                                          34 * sizeof(u32));
 821                 if (!ret) {
 822                         val = task_thread_info(target)->xfsr[0];
 823                         val &= 0xffffffff00000000UL;
 824                         val |= fsr;
 825                         task_thread_info(target)->xfsr[0] = val;
 826                 }
 827         }
 828
 829         fprs |= (FPRS_FEF | FPRS_DL);
 830         task_thread_info(target)->fpsaved[0] = fprs;
 831
 832         if (!ret)
 833                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 834                                                 34 * sizeof(u32), -1);
 835         return ret;
 836 }
 837
 838 static const struct user_regset sparc32_regsets[] = {
 839         /* Format is:
 840          *      G0 --> G7
 841          *      O0 --> O7
 842          *      L0 --> L7
 843          *      I0 --> I7
 844          *      PSR, PC, nPC, Y, WIM, TBR
 845          */
 846         [REGSET_GENERAL] = {
 847                 .core_note_type = NT_PRSTATUS,
 848                 .n = 38,
 849                 .size = sizeof(u32), .align = sizeof(u32),
 850                 .get = genregs32_get, .set = genregs32_set
 851         },
 852         /* Format is:
 853          *      F0 --> F31
 854          *      empty 32-bit word
 855          *      FSR (32--bit word)
 856          *      FPU QUEUE COUNT (8-bit char)
 857          *      FPU QUEUE ENTRYSIZE (8-bit char)
 858          *      FPU ENABLED (8-bit char)
 859          *      empty 8-bit char
 860          *      FPU QUEUE (64 32-bit ints)
 861          */
 862         [REGSET_FP] = {
 863                 .core_note_type = NT_PRFPREG,
 864                 .n = 99,
 865                 .size = sizeof(u32), .align = sizeof(u32),
 866                 .get = fpregs32_get, .set = fpregs32_set
 867         },
 868 };
 869
 870 static const struct user_regset_view user_sparc32_view = {
 871         .name = "sparc", .e_machine = EM_SPARC,
 872         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 873 };
 874 #endif /* CONFIG_COMPAT */
 875
 876 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 877 {
 878 #ifdef CONFIG_COMPAT
 879         if (test_tsk_thread_flag(task, TIF_32BIT))
 880                 return &user_sparc32_view;
 881 #endif
 882         return &user_sparc64_view;
 883 }
 884
 885 #ifdef CONFIG_COMPAT
 886 struct compat_fps {
 887         unsigned int regs[32];
 888         unsigned int fsr;
 889         unsigned int flags;
 890         unsigned int extra;
 891         unsigned int fpqd;
 892         struct compat_fq {
 893                 unsigned int insnaddr;
 894                 unsigned int insn;
 895         } fpq[16];
 896 };
 897
 898 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 899                         compat_ulong_t caddr, compat_ulong_t cdata)
 900 {
 901         const struct user_regset_view *view = task_user_regset_view(current);
 902         compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
 903         struct pt_regs32 __user *pregs;
 904         struct compat_fps __user *fps;
 905         unsigned long addr2 = caddr2;
 906         unsigned long addr = caddr;
 907         unsigned long data = cdata;
 908         int ret;
 909
 910         pregs = (struct pt_regs32 __user *) addr;
 911         fps = (struct compat_fps __user *) addr;
 912
 913         switch (request) {
 914         case PTRACE_PEEKUSR:
 915                 ret = (addr != 0) ? -EIO : 0;
 916                 break;
 917
 918         case PTRACE_GETREGS:
 919                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 920                                           32 * sizeof(u32),
 921                                           4 * sizeof(u32),
 922                                           &pregs->psr);
 923                 if (!ret)
 924                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 925                                                   1 * sizeof(u32),
 926                                                   15 * sizeof(u32),
 927                                                   &pregs->u_regs[0]);
 928                 break;
 929
 930         case PTRACE_SETREGS:
 931                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 932                                             32 * sizeof(u32),
 933                                             4 * sizeof(u32),
 934                                             &pregs->psr);
 935                 if (!ret)
 936                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 937                                                     1 * sizeof(u32),
 938                                                     15 * sizeof(u32),
 939                                                     &pregs->u_regs[0]);
 940                 break;
 941
 942         case PTRACE_GETFPREGS:
 943                 ret = copy_regset_to_user(child, view, REGSET_FP,
 944                                           0 * sizeof(u32),
 945                                           32 * sizeof(u32),
 946                                           &fps->regs[0]);
 947                 if (!ret)
 948                         ret = copy_regset_to_user(child, view, REGSET_FP,
 949                                                   33 * sizeof(u32),
 950                                                   1 * sizeof(u32),
 951                                                   &fps->fsr);
 952                 if (!ret) {
 953                         if (__put_user(0, &fps->flags) ||
 954                             __put_user(0, &fps->extra) ||
 955                             __put_user(0, &fps->fpqd) ||
 956                             clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
 957                                 ret = -EFAULT;
 958                 }
 959                 break;
 960
 961         case PTRACE_SETFPREGS:
 962                 ret = copy_regset_from_user(child, view, REGSET_FP,
 963                                             0 * sizeof(u32),
 964                                             32 * sizeof(u32),
 965                                             &fps->regs[0]);
 966                 if (!ret)
 967                         ret = copy_regset_from_user(child, view, REGSET_FP,
 968                                                     33 * sizeof(u32),
 969                                                     1 * sizeof(u32),
 970                                                     &fps->fsr);
 971                 break;
 972
 973         case PTRACE_READTEXT:
 974         case PTRACE_READDATA:
 975                 ret = ptrace_readdata(child, addr,
 976                                       (char __user *)addr2, data);
 977                 if (ret == data)
 978                         ret = 0;
 979                 else if (ret >= 0)
 980                         ret = -EIO;
 981                 break;
 982
 983         case PTRACE_WRITETEXT:
 984         case PTRACE_WRITEDATA:
 985                 ret = ptrace_writedata(child, (char __user *) addr2,
 986                                        addr, data);
 987                 if (ret == data)
 988                         ret = 0;
 989                 else if (ret >= 0)
 990                         ret = -EIO;
 991                 break;
 992
 993         default:
 994                 if (request == PTRACE_SPARC_DETACH)
 995                         request = PTRACE_DETACH;
 996                 ret = compat_ptrace_request(child, request, addr, data);
 997                 break;
 998         }
 999
1000         return ret;
1001 }
1002 #endif /* CONFIG_COMPAT */
1003
1004 struct fps {
1005         unsigned int regs[64];
1006         unsigned long fsr;
1007 };
1008
1009 long arch_ptrace(struct task_struct *child, long request,
1010                  unsigned long addr, unsigned long data)
1011 {
1012         const struct user_regset_view *view = task_user_regset_view(current);
1013         unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
1014         struct pt_regs __user *pregs;
1015         struct fps __user *fps;
1016         void __user *addr2p;
1017         int ret;
1018
1019         pregs = (struct pt_regs __user *) addr;
1020         fps = (struct fps __user *) addr;
1021         addr2p = (void __user *) addr2;
1022
1023         switch (request) {
1024         case PTRACE_PEEKUSR:
1025                 ret = (addr != 0) ? -EIO : 0;
1026                 break;
1027
1028         case PTRACE_GETREGS64:
1029                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1030                                           1 * sizeof(u64),
1031                                           15 * sizeof(u64),
1032                                           &pregs->u_regs[0]);
1033                 if (!ret) {
1034                         /* XXX doesn't handle 'y' register correctly XXX */
1035                         ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1036                                                   32 * sizeof(u64),
1037                                                   4 * sizeof(u64),
1038                                                   &pregs->tstate);
1039                 }
1040                 break;
1041
1042         case PTRACE_SETREGS64:
1043                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1044                                             1 * sizeof(u64),
1045                                             15 * sizeof(u64),
1046                                             &pregs->u_regs[0]);
1047                 if (!ret) {
1048                         /* XXX doesn't handle 'y' register correctly XXX */
1049                         ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1050                                                     32 * sizeof(u64),
1051                                                     4 * sizeof(u64),
1052                                                     &pregs->tstate);
1053                 }
1054                 break;
1055
1056         case PTRACE_GETFPREGS64:
1057                 ret = copy_regset_to_user(child, view, REGSET_FP,
1058                                           0 * sizeof(u64),
1059                                           33 * sizeof(u64),
1060                                           fps);
1061                 break;
1062
1063         case PTRACE_SETFPREGS64:
1064                 ret = copy_regset_from_user(child, view, REGSET_FP,
1065                                           0 * sizeof(u64),
1066                                           33 * sizeof(u64),
1067                                           fps);
1068                 break;
1069
1070         case PTRACE_READTEXT:
1071         case PTRACE_READDATA:
1072                 ret = ptrace_readdata(child, addr, addr2p, data);
1073                 if (ret == data)
1074                         ret = 0;
1075                 else if (ret >= 0)
1076                         ret = -EIO;
1077                 break;
1078
1079         case PTRACE_WRITETEXT:
1080         case PTRACE_WRITEDATA:
1081                 ret = ptrace_writedata(child, addr2p, addr, data);
1082                 if (ret == data)
1083                         ret = 0;
1084                 else if (ret >= 0)
1085                         ret = -EIO;
1086                 break;
1087
1088         default:
1089                 if (request == PTRACE_SPARC_DETACH)
1090                         request = PTRACE_DETACH;
1091                 ret = ptrace_request(child, request, addr, data);
1092                 break;
1093         }
1094
1095         return ret;
1096 }
1097
1098 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1099 {
1100         int ret = 0;
1101
1102         /* do the secure computing check first */
1103         secure_computing_strict(regs->u_regs[UREG_G1]);
1104
1105         if (test_thread_flag(TIF_NOHZ))
1106                 user_exit();
1107
1108         if (test_thread_flag(TIF_SYSCALL_TRACE))
1109                 ret = tracehook_report_syscall_entry(regs);
1110
1111         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1112                 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1113
1114         audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
1115                             regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
1116                             regs->u_regs[UREG_I3]);
1117
1118         return ret;
1119 }
1120
1121 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1122 {
1123         if (test_thread_flag(TIF_NOHZ))
1124                 user_exit();
1125
1126         audit_syscall_exit(regs);
1127
1128         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1129                 trace_sys_exit(regs, regs->u_regs[UREG_I0]);
1130
1131         if (test_thread_flag(TIF_SYSCALL_TRACE))
1132                 tracehook_report_syscall_exit(regs, 0);
1133
1134         if (test_thread_flag(TIF_NOHZ))
1135                 user_enter();
1136 }
1137
1138 /**
1139  * regs_query_register_offset() - query register offset from its name
1140  * @name:       the name of a register
1141  *
1142  * regs_query_register_offset() returns the offset of a register in struct
1143  * pt_regs from its name. If the name is invalid, this returns -EINVAL;
1144  */
1145 int regs_query_register_offset(const char *name)
1146 {
1147         const struct pt_regs_offset *roff;
1148
1149         for (roff = regoffset_table; roff->name != NULL; roff++)
1150                 if (!strcmp(roff->name, name))
1151                         return roff->offset;
1152         return -EINVAL;
1153 }
1154
1155 /**
1156  * regs_within_kernel_stack() - check the address in the stack
1157  * @regs:       pt_regs which contains kernel stack pointer.
1158  * @addr:       address which is checked.
1159  *
1160  * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
1161  * If @addr is within the kernel stack, it returns true. If not, returns false.
1162  */
1163 static inline int regs_within_kernel_stack(struct pt_regs *regs,
1164                                            unsigned long addr)
1165 {
1166         unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;
1167         return ((addr & ~(THREAD_SIZE - 1))  ==
1168                 (ksp & ~(THREAD_SIZE - 1)));
1169 }
1170
1171 /**
1172  * regs_get_kernel_stack_nth() - get Nth entry of the stack
1173  * @regs:       pt_regs which contains kernel stack pointer.
1174  * @n:          stack entry number.
1175  *
1176  * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1177  * is specified by @regs. If the @n th entry is NOT in the kernel stack,
1178  * this returns 0.
1179  */
1180 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1181 {
1182         unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;
1183         unsigned long *addr = (unsigned long *)ksp;
1184         addr += n;
1185         if (regs_within_kernel_stack(regs, (unsigned long)addr))
1186                 return *addr;
1187         else
1188                 return 0;
1189 }