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