git.oblomov.eu Git - linux-2.6/blob - arch/sparc64/kernel/ptrace.c

   1 /* ptrace.c: Sparc process tracing support.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
   4  * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  *
   6  * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
   7  * and David Mosberger.
   8  *
   9  * Added Linux support -miguel (weird, eh?, the original code was meant
  10  * to emulate SunOS).
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/sched.h>
  15 #include <linux/mm.h>
  16 #include <linux/errno.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/user.h>
  19 #include <linux/smp.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/security.h>
  22 #include <linux/seccomp.h>
  23 #include <linux/audit.h>
  24 #include <linux/signal.h>
  25
  26 #include <asm/asi.h>
  27 #include <asm/pgtable.h>
  28 #include <asm/system.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/psrcompat.h>
  31 #include <asm/visasm.h>
  32 #include <asm/spitfire.h>
  33
  34 /* Returning from ptrace is a bit tricky because the syscall return
  35  * low level code assumes any value returned which is negative and
  36  * is a valid errno will mean setting the condition codes to indicate
  37  * an error return.  This doesn't work, so we have this hook.
  38  */
  39 static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
  40 {
  41         regs->u_regs[UREG_I0] = error;
  42         regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY);
  43         regs->tpc = regs->tnpc;
  44         regs->tnpc += 4;
  45 }
  46
  47 static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
  48 {
  49         regs->u_regs[UREG_I0] = value;
  50         regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
  51         regs->tpc = regs->tnpc;
  52         regs->tnpc += 4;
  53 }
  54
  55 static inline void
  56 pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr)
  57 {
  58         if (test_thread_flag(TIF_32BIT)) {
  59                 if (put_user(value, (unsigned int __user *) addr)) {
  60                         pt_error_return(regs, EFAULT);
  61                         return;
  62                 }
  63         } else {
  64                 if (put_user(value, (long __user *) addr)) {
  65                         pt_error_return(regs, EFAULT);
  66                         return;
  67                 }
  68         }
  69         regs->u_regs[UREG_I0] = 0;
  70         regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
  71         regs->tpc = regs->tnpc;
  72         regs->tnpc += 4;
  73 }
  74
  75 static void
  76 pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr)
  77 {
  78         if (current->personality == PER_SUNOS)
  79                 pt_succ_return (regs, val);
  80         else
  81                 pt_succ_return_linux (regs, val, addr);
  82 }
  83
  84 /* #define ALLOW_INIT_TRACING */
  85 /* #define DEBUG_PTRACE */
  86
  87 #ifdef DEBUG_PTRACE
  88 char *pt_rq [] = {
  89         /* 0  */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
  90         /* 4  */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
  91         /* 8  */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
  92         /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
  93         /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
  94         /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
  95         /* 24 */ "SYSCALL", ""
  96 };
  97 #endif
  98
  99 /*
 100  * Called by kernel/ptrace.c when detaching..
 101  *
 102  * Make sure single step bits etc are not set.
 103  */
 104 void ptrace_disable(struct task_struct *child)
 105 {
 106         /* nothing to do */
 107 }
 108
 109 /* To get the necessary page struct, access_process_vm() first calls
 110  * get_user_pages().  This has done a flush_dcache_page() on the
 111  * accessed page.  Then our caller (copy_{to,from}_user_page()) did
 112  * to memcpy to read/write the data from that page.
 113  *
 114  * Now, the only thing we have to do is:
 115  * 1) flush the D-cache if it's possible than an illegal alias
 116  *    has been created
 117  * 2) flush the I-cache if this is pre-cheetah and we did a write
 118  */
 119 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
 120                          unsigned long uaddr, void *kaddr,
 121                          unsigned long len, int write)
 122 {
 123         BUG_ON(len > PAGE_SIZE);
 124
 125 #ifdef DCACHE_ALIASING_POSSIBLE
 126         /* If bit 13 of the kernel address we used to access the
 127          * user page is the same as the virtual address that page
 128          * is mapped to in the user's address space, we can skip the
 129          * D-cache flush.
 130          */
 131         if ((uaddr ^ kaddr) & (1UL << 13)) {
 132                 unsigned long start = __pa(kaddr);
 133                 unsigned long end = start + len;
 134
 135                 if (tlb_type == spitfire) {
 136                         for (; start < end; start += 32)
 137                                 spitfire_put_dcache_tag(va & 0x3fe0, 0x0);
 138                 } else {
 139                         for (; start < end; start += 32)
 140                                 __asm__ __volatile__(
 141                                         "stxa %%g0, [%0] %1\n\t"
 142                                         "membar #Sync"
 143                                         : /* no outputs */
 144                                         : "r" (va),
 145                                         "i" (ASI_DCACHE_INVALIDATE));
 146                 }
 147         }
 148 #endif
 149         if (write && tlb_type == spitfire) {
 150                 unsigned long start = (unsigned long) kaddr;
 151                 unsigned long end = start + len;
 152
 153                 for (; start < end; start += 32)
 154                         flushi(start);
 155         }
 156 }
 157
 158 asmlinkage void do_ptrace(struct pt_regs *regs)
 159 {
 160         int request = regs->u_regs[UREG_I0];
 161         pid_t pid = regs->u_regs[UREG_I1];
 162         unsigned long addr = regs->u_regs[UREG_I2];
 163         unsigned long data = regs->u_regs[UREG_I3];
 164         unsigned long addr2 = regs->u_regs[UREG_I4];
 165         struct task_struct *child;
 166         int ret;
 167
 168         if (test_thread_flag(TIF_32BIT)) {
 169                 addr &= 0xffffffffUL;
 170                 data &= 0xffffffffUL;
 171                 addr2 &= 0xffffffffUL;
 172         }
 173         lock_kernel();
 174 #ifdef DEBUG_PTRACE
 175         {
 176                 char *s;
 177
 178                 if ((request >= 0) && (request <= 24))
 179                         s = pt_rq [request];
 180                 else
 181                         s = "unknown";
 182
 183                 if (request == PTRACE_POKEDATA && data == 0x91d02001){
 184                         printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
 185                                 pid, addr, addr2);
 186                 } else
 187                         printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
 188                                s, request, pid, addr, data, addr2);
 189         }
 190 #endif
 191         if (request == PTRACE_TRACEME) {
 192                 int ret;
 193
 194                 /* are we already being traced? */
 195                 if (current->ptrace & PT_PTRACED) {
 196                         pt_error_return(regs, EPERM);
 197                         goto out;
 198                 }
 199                 ret = security_ptrace(current->parent, current);
 200                 if (ret) {
 201                         pt_error_return(regs, -ret);
 202                         goto out;
 203                 }
 204
 205                 /* set the ptrace bit in the process flags. */
 206                 current->ptrace |= PT_PTRACED;
 207                 pt_succ_return(regs, 0);
 208                 goto out;
 209         }
 210 #ifndef ALLOW_INIT_TRACING
 211         if (pid == 1) {
 212                 /* Can't dork with init. */
 213                 pt_error_return(regs, EPERM);
 214                 goto out;
 215         }
 216 #endif
 217         read_lock(&tasklist_lock);
 218         child = find_task_by_pid(pid);
 219         if (child)
 220                 get_task_struct(child);
 221         read_unlock(&tasklist_lock);
 222
 223         if (!child) {
 224                 pt_error_return(regs, ESRCH);
 225                 goto out;
 226         }
 227
 228         if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
 229             || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
 230                 if (ptrace_attach(child)) {
 231                         pt_error_return(regs, EPERM);
 232                         goto out_tsk;
 233                 }
 234                 pt_succ_return(regs, 0);
 235                 goto out_tsk;
 236         }
 237
 238         ret = ptrace_check_attach(child, request == PTRACE_KILL);
 239         if (ret < 0) {
 240                 pt_error_return(regs, -ret);
 241                 goto out_tsk;
 242         }
 243
 244         if (!(test_thread_flag(TIF_32BIT))      &&
 245             ((request == PTRACE_READDATA64)             ||
 246              (request == PTRACE_WRITEDATA64)            ||
 247              (request == PTRACE_READTEXT64)             ||
 248              (request == PTRACE_WRITETEXT64)            ||
 249              (request == PTRACE_PEEKTEXT64)             ||
 250              (request == PTRACE_POKETEXT64)             ||
 251              (request == PTRACE_PEEKDATA64)             ||
 252              (request == PTRACE_POKEDATA64))) {
 253                 addr = regs->u_regs[UREG_G2];
 254                 addr2 = regs->u_regs[UREG_G3];
 255                 request -= 30; /* wheee... */
 256         }
 257
 258         switch(request) {
 259         case PTRACE_PEEKTEXT: /* read word at location addr. */
 260         case PTRACE_PEEKDATA: {
 261                 unsigned long tmp64;
 262                 unsigned int tmp32;
 263                 int res, copied;
 264
 265                 res = -EIO;
 266                 if (test_thread_flag(TIF_32BIT)) {
 267                         copied = access_process_vm(child, addr,
 268                                                    &tmp32, sizeof(tmp32), 0);
 269                         tmp64 = (unsigned long) tmp32;
 270                         if (copied == sizeof(tmp32))
 271                                 res = 0;
 272                 } else {
 273                         copied = access_process_vm(child, addr,
 274                                                    &tmp64, sizeof(tmp64), 0);
 275                         if (copied == sizeof(tmp64))
 276                                 res = 0;
 277                 }
 278                 if (res < 0)
 279                         pt_error_return(regs, -res);
 280                 else
 281                         pt_os_succ_return(regs, tmp64, (void __user *) data);
 282                 goto out_tsk;
 283         }
 284
 285         case PTRACE_POKETEXT: /* write the word at location addr. */
 286         case PTRACE_POKEDATA: {
 287                 unsigned long tmp64;
 288                 unsigned int tmp32;
 289                 int copied, res = -EIO;
 290
 291                 if (test_thread_flag(TIF_32BIT)) {
 292                         tmp32 = data;
 293                         copied = access_process_vm(child, addr,
 294                                                    &tmp32, sizeof(tmp32), 1);
 295                         if (copied == sizeof(tmp32))
 296                                 res = 0;
 297                 } else {
 298                         tmp64 = data;
 299                         copied = access_process_vm(child, addr,
 300                                                    &tmp64, sizeof(tmp64), 1);
 301                         if (copied == sizeof(tmp64))
 302                                 res = 0;
 303                 }
 304                 if (res < 0)
 305                         pt_error_return(regs, -res);
 306                 else
 307                         pt_succ_return(regs, res);
 308                 goto out_tsk;
 309         }
 310
 311         case PTRACE_GETREGS: {
 312                 struct pt_regs32 __user *pregs =
 313                         (struct pt_regs32 __user *) addr;
 314                 struct pt_regs *cregs = child->thread_info->kregs;
 315                 int rval;
 316
 317                 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
 318                     __put_user(cregs->tpc, (&pregs->pc)) ||
 319                     __put_user(cregs->tnpc, (&pregs->npc)) ||
 320                     __put_user(cregs->y, (&pregs->y))) {
 321                         pt_error_return(regs, EFAULT);
 322                         goto out_tsk;
 323                 }
 324                 for (rval = 1; rval < 16; rval++)
 325                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 326                                 pt_error_return(regs, EFAULT);
 327                                 goto out_tsk;
 328                         }
 329                 pt_succ_return(regs, 0);
 330 #ifdef DEBUG_PTRACE
 331                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 332 #endif
 333                 goto out_tsk;
 334         }
 335
 336         case PTRACE_GETREGS64: {
 337                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 338                 struct pt_regs *cregs = child->thread_info->kregs;
 339                 unsigned long tpc = cregs->tpc;
 340                 int rval;
 341
 342                 if ((child->thread_info->flags & _TIF_32BIT) != 0)
 343                         tpc &= 0xffffffff;
 344                 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
 345                     __put_user(tpc, (&pregs->tpc)) ||
 346                     __put_user(cregs->tnpc, (&pregs->tnpc)) ||
 347                     __put_user(cregs->y, (&pregs->y))) {
 348                         pt_error_return(regs, EFAULT);
 349                         goto out_tsk;
 350                 }
 351                 for (rval = 1; rval < 16; rval++)
 352                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 353                                 pt_error_return(regs, EFAULT);
 354                                 goto out_tsk;
 355                         }
 356                 pt_succ_return(regs, 0);
 357 #ifdef DEBUG_PTRACE
 358                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 359 #endif
 360                 goto out_tsk;
 361         }
 362
 363         case PTRACE_SETREGS: {
 364                 struct pt_regs32 __user *pregs =
 365                         (struct pt_regs32 __user *) addr;
 366                 struct pt_regs *cregs = child->thread_info->kregs;
 367                 unsigned int psr, pc, npc, y;
 368                 int i;
 369
 370                 /* Must be careful, tracing process can only set certain
 371                  * bits in the psr.
 372                  */
 373                 if (__get_user(psr, (&pregs->psr)) ||
 374                     __get_user(pc, (&pregs->pc)) ||
 375                     __get_user(npc, (&pregs->npc)) ||
 376                     __get_user(y, (&pregs->y))) {
 377                         pt_error_return(regs, EFAULT);
 378                         goto out_tsk;
 379                 }
 380                 cregs->tstate &= ~(TSTATE_ICC);
 381                 cregs->tstate |= psr_to_tstate_icc(psr);
 382                 if (!((pc | npc) & 3)) {
 383                         cregs->tpc = pc;
 384                         cregs->tnpc = npc;
 385                 }
 386                 cregs->y = y;
 387                 for (i = 1; i < 16; i++) {
 388                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 389                                 pt_error_return(regs, EFAULT);
 390                                 goto out_tsk;
 391                         }
 392                 }
 393                 pt_succ_return(regs, 0);
 394                 goto out_tsk;
 395         }
 396
 397         case PTRACE_SETREGS64: {
 398                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 399                 struct pt_regs *cregs = child->thread_info->kregs;
 400                 unsigned long tstate, tpc, tnpc, y;
 401                 int i;
 402
 403                 /* Must be careful, tracing process can only set certain
 404                  * bits in the psr.
 405                  */
 406                 if (__get_user(tstate, (&pregs->tstate)) ||
 407                     __get_user(tpc, (&pregs->tpc)) ||
 408                     __get_user(tnpc, (&pregs->tnpc)) ||
 409                     __get_user(y, (&pregs->y))) {
 410                         pt_error_return(regs, EFAULT);
 411                         goto out_tsk;
 412                 }
 413                 if ((child->thread_info->flags & _TIF_32BIT) != 0) {
 414                         tpc &= 0xffffffff;
 415                         tnpc &= 0xffffffff;
 416                 }
 417                 tstate &= (TSTATE_ICC | TSTATE_XCC);
 418                 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 419                 cregs->tstate |= tstate;
 420                 if (!((tpc | tnpc) & 3)) {
 421                         cregs->tpc = tpc;
 422                         cregs->tnpc = tnpc;
 423                 }
 424                 cregs->y = y;
 425                 for (i = 1; i < 16; i++) {
 426                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 427                                 pt_error_return(regs, EFAULT);
 428                                 goto out_tsk;
 429                         }
 430                 }
 431                 pt_succ_return(regs, 0);
 432                 goto out_tsk;
 433         }
 434
 435         case PTRACE_GETFPREGS: {
 436                 struct fps {
 437                         unsigned int regs[32];
 438                         unsigned int fsr;
 439                         unsigned int flags;
 440                         unsigned int extra;
 441                         unsigned int fpqd;
 442                         struct fq {
 443                                 unsigned int insnaddr;
 444                                 unsigned int insn;
 445                         } fpq[16];
 446                 };
 447                 struct fps __user *fps = (struct fps __user *) addr;
 448                 unsigned long *fpregs = child->thread_info->fpregs;
 449
 450                 if (copy_to_user(&fps->regs[0], fpregs,
 451                                  (32 * sizeof(unsigned int))) ||
 452                     __put_user(child->thread_info->xfsr[0], (&fps->fsr)) ||
 453                     __put_user(0, (&fps->fpqd)) ||
 454                     __put_user(0, (&fps->flags)) ||
 455                     __put_user(0, (&fps->extra)) ||
 456                     clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
 457                         pt_error_return(regs, EFAULT);
 458                         goto out_tsk;
 459                 }
 460                 pt_succ_return(regs, 0);
 461                 goto out_tsk;
 462         }
 463
 464         case PTRACE_GETFPREGS64: {
 465                 struct fps {
 466                         unsigned int regs[64];
 467                         unsigned long fsr;
 468                 };
 469                 struct fps __user *fps = (struct fps __user *) addr;
 470                 unsigned long *fpregs = child->thread_info->fpregs;
 471
 472                 if (copy_to_user(&fps->regs[0], fpregs,
 473                                  (64 * sizeof(unsigned int))) ||
 474                     __put_user(child->thread_info->xfsr[0], (&fps->fsr))) {
 475                         pt_error_return(regs, EFAULT);
 476                         goto out_tsk;
 477                 }
 478                 pt_succ_return(regs, 0);
 479                 goto out_tsk;
 480         }
 481
 482         case PTRACE_SETFPREGS: {
 483                 struct fps {
 484                         unsigned int regs[32];
 485                         unsigned int fsr;
 486                         unsigned int flags;
 487                         unsigned int extra;
 488                         unsigned int fpqd;
 489                         struct fq {
 490                                 unsigned int insnaddr;
 491                                 unsigned int insn;
 492                         } fpq[16];
 493                 };
 494                 struct fps __user *fps = (struct fps __user *) addr;
 495                 unsigned long *fpregs = child->thread_info->fpregs;
 496                 unsigned fsr;
 497
 498                 if (copy_from_user(fpregs, &fps->regs[0],
 499                                    (32 * sizeof(unsigned int))) ||
 500                     __get_user(fsr, (&fps->fsr))) {
 501                         pt_error_return(regs, EFAULT);
 502                         goto out_tsk;
 503                 }
 504                 child->thread_info->xfsr[0] &= 0xffffffff00000000UL;
 505                 child->thread_info->xfsr[0] |= fsr;
 506                 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
 507                         child->thread_info->gsr[0] = 0;
 508                 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
 509                 pt_succ_return(regs, 0);
 510                 goto out_tsk;
 511         }
 512
 513         case PTRACE_SETFPREGS64: {
 514                 struct fps {
 515                         unsigned int regs[64];
 516                         unsigned long fsr;
 517                 };
 518                 struct fps __user *fps = (struct fps __user *) addr;
 519                 unsigned long *fpregs = child->thread_info->fpregs;
 520
 521                 if (copy_from_user(fpregs, &fps->regs[0],
 522                                    (64 * sizeof(unsigned int))) ||
 523                     __get_user(child->thread_info->xfsr[0], (&fps->fsr))) {
 524                         pt_error_return(regs, EFAULT);
 525                         goto out_tsk;
 526                 }
 527                 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
 528                         child->thread_info->gsr[0] = 0;
 529                 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 530                 pt_succ_return(regs, 0);
 531                 goto out_tsk;
 532         }
 533
 534         case PTRACE_READTEXT:
 535         case PTRACE_READDATA: {
 536                 int res = ptrace_readdata(child, addr,
 537                                           (char __user *)addr2, data);
 538                 if (res == data) {
 539                         pt_succ_return(regs, 0);
 540                         goto out_tsk;
 541                 }
 542                 if (res >= 0)
 543                         res = -EIO;
 544                 pt_error_return(regs, -res);
 545                 goto out_tsk;
 546         }
 547
 548         case PTRACE_WRITETEXT:
 549         case PTRACE_WRITEDATA: {
 550                 int res = ptrace_writedata(child, (char __user *) addr2,
 551                                            addr, data);
 552                 if (res == data) {
 553                         pt_succ_return(regs, 0);
 554                         goto out_tsk;
 555                 }
 556                 if (res >= 0)
 557                         res = -EIO;
 558                 pt_error_return(regs, -res);
 559                 goto out_tsk;
 560         }
 561         case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
 562                 addr = 1;
 563
 564         case PTRACE_CONT: { /* restart after signal. */
 565                 if (!valid_signal(data)) {
 566                         pt_error_return(regs, EIO);
 567                         goto out_tsk;
 568                 }
 569
 570                 if (request == PTRACE_SYSCALL) {
 571                         set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 572                 } else {
 573                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 574                 }
 575
 576                 child->exit_code = data;
 577 #ifdef DEBUG_PTRACE
 578                 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
 579                         child->pid, child->exit_code,
 580                         child->thread_info->kregs->tpc,
 581                         child->thread_info->kregs->tnpc);
 582
 583 #endif
 584                 wake_up_process(child);
 585                 pt_succ_return(regs, 0);
 586                 goto out_tsk;
 587         }
 588
 589 /*
 590  * make the child exit.  Best I can do is send it a sigkill.
 591  * perhaps it should be put in the status that it wants to
 592  * exit.
 593  */
 594         case PTRACE_KILL: {
 595                 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
 596                         pt_succ_return(regs, 0);
 597                         goto out_tsk;
 598                 }
 599                 child->exit_code = SIGKILL;
 600                 wake_up_process(child);
 601                 pt_succ_return(regs, 0);
 602                 goto out_tsk;
 603         }
 604
 605         case PTRACE_SUNDETACH: { /* detach a process that was attached. */
 606                 int error = ptrace_detach(child, data);
 607                 if (error) {
 608                         pt_error_return(regs, EIO);
 609                         goto out_tsk;
 610                 }
 611                 pt_succ_return(regs, 0);
 612                 goto out_tsk;
 613         }
 614
 615         /* PTRACE_DUMPCORE unsupported... */
 616
 617         default: {
 618                 int err = ptrace_request(child, request, addr, data);
 619                 if (err)
 620                         pt_error_return(regs, -err);
 621                 else
 622                         pt_succ_return(regs, 0);
 623                 goto out_tsk;
 624         }
 625         }
 626 out_tsk:
 627         if (child)
 628                 put_task_struct(child);
 629 out:
 630         unlock_kernel();
 631 }
 632
 633 asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
 634 {
 635         /* do the secure computing check first */
 636         secure_computing(regs->u_regs[UREG_G1]);
 637
 638         if (unlikely(current->audit_context) && syscall_exit_p) {
 639                 unsigned long tstate = regs->tstate;
 640                 int result = AUDITSC_SUCCESS;
 641
 642                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
 643                         result = AUDITSC_FAILURE;
 644
 645                 audit_syscall_exit(current, result, regs->u_regs[UREG_I0]);
 646         }
 647
 648         if (!(current->ptrace & PT_PTRACED))
 649                 goto out;
 650
 651         if (!test_thread_flag(TIF_SYSCALL_TRACE))
 652                 goto out;
 653
 654         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 655                                  ? 0x80 : 0));
 656
 657         /*
 658          * this isn't the same as continuing with a signal, but it will do
 659          * for normal use.  strace only continues with a signal if the
 660          * stopping signal is not SIGTRAP.  -brl
 661          */
 662         if (current->exit_code) {
 663                 send_sig(current->exit_code, current, 1);
 664                 current->exit_code = 0;
 665         }
 666
 667 out:
 668         if (unlikely(current->audit_context) && !syscall_exit_p)
 669                 audit_syscall_entry(current,
 670                                     (test_thread_flag(TIF_32BIT) ?
 671                                      AUDIT_ARCH_SPARC :
 672                                      AUDIT_ARCH_SPARC64),
 673                                     regs->u_regs[UREG_G1],
 674                                     regs->u_regs[UREG_I0],
 675                                     regs->u_regs[UREG_I1],
 676                                     regs->u_regs[UREG_I2],
 677                                     regs->u_regs[UREG_I3]);
 678 }