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
 213         if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
 214             || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
 215                 if (ptrace_attach(child)) {
 216                         pt_error_return(regs, EPERM);
 217                         goto out_tsk;
 218                 }
 219                 pt_succ_return(regs, 0);
 220                 goto out_tsk;
 221         }
 222
 223         ret = ptrace_check_attach(child, request == PTRACE_KILL);
 224         if (ret < 0) {
 225                 pt_error_return(regs, -ret);
 226                 goto out_tsk;
 227         }
 228
 229         if (!(test_thread_flag(TIF_32BIT))      &&
 230             ((request == PTRACE_READDATA64)             ||
 231              (request == PTRACE_WRITEDATA64)            ||
 232              (request == PTRACE_READTEXT64)             ||
 233              (request == PTRACE_WRITETEXT64)            ||
 234              (request == PTRACE_PEEKTEXT64)             ||
 235              (request == PTRACE_POKETEXT64)             ||
 236              (request == PTRACE_PEEKDATA64)             ||
 237              (request == PTRACE_POKEDATA64))) {
 238                 addr = regs->u_regs[UREG_G2];
 239                 addr2 = regs->u_regs[UREG_G3];
 240                 request -= 30; /* wheee... */
 241         }
 242
 243         switch(request) {
 244         case PTRACE_PEEKTEXT: /* read word at location addr. */
 245         case PTRACE_PEEKDATA: {
 246                 unsigned long tmp64;
 247                 unsigned int tmp32;
 248                 int res, copied;
 249
 250                 res = -EIO;
 251                 if (test_thread_flag(TIF_32BIT)) {
 252                         copied = access_process_vm(child, addr,
 253                                                    &tmp32, sizeof(tmp32), 0);
 254                         tmp64 = (unsigned long) tmp32;
 255                         if (copied == sizeof(tmp32))
 256                                 res = 0;
 257                 } else {
 258                         copied = access_process_vm(child, addr,
 259                                                    &tmp64, sizeof(tmp64), 0);
 260                         if (copied == sizeof(tmp64))
 261                                 res = 0;
 262                 }
 263                 if (res < 0)
 264                         pt_error_return(regs, -res);
 265                 else
 266                         pt_os_succ_return(regs, tmp64, (void __user *) data);
 267                 goto out_tsk;
 268         }
 269
 270         case PTRACE_POKETEXT: /* write the word at location addr. */
 271         case PTRACE_POKEDATA: {
 272                 unsigned long tmp64;
 273                 unsigned int tmp32;
 274                 int copied, res = -EIO;
 275
 276                 if (test_thread_flag(TIF_32BIT)) {
 277                         tmp32 = data;
 278                         copied = access_process_vm(child, addr,
 279                                                    &tmp32, sizeof(tmp32), 1);
 280                         if (copied == sizeof(tmp32))
 281                                 res = 0;
 282                 } else {
 283                         tmp64 = data;
 284                         copied = access_process_vm(child, addr,
 285                                                    &tmp64, sizeof(tmp64), 1);
 286                         if (copied == sizeof(tmp64))
 287                                 res = 0;
 288                 }
 289                 if (res < 0)
 290                         pt_error_return(regs, -res);
 291                 else
 292                         pt_succ_return(regs, res);
 293                 goto out_tsk;
 294         }
 295
 296         case PTRACE_GETREGS: {
 297                 struct pt_regs32 __user *pregs =
 298                         (struct pt_regs32 __user *) addr;
 299                 struct pt_regs *cregs = task_pt_regs(child);
 300                 int rval;
 301
 302                 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
 303                     __put_user(cregs->tpc, (&pregs->pc)) ||
 304                     __put_user(cregs->tnpc, (&pregs->npc)) ||
 305                     __put_user(cregs->y, (&pregs->y))) {
 306                         pt_error_return(regs, EFAULT);
 307                         goto out_tsk;
 308                 }
 309                 for (rval = 1; rval < 16; rval++)
 310                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 311                                 pt_error_return(regs, EFAULT);
 312                                 goto out_tsk;
 313                         }
 314                 pt_succ_return(regs, 0);
 315 #ifdef DEBUG_PTRACE
 316                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 317 #endif
 318                 goto out_tsk;
 319         }
 320
 321         case PTRACE_GETREGS64: {
 322                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 323                 struct pt_regs *cregs = task_pt_regs(child);
 324                 unsigned long tpc = cregs->tpc;
 325                 int rval;
 326
 327                 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0)
 328                         tpc &= 0xffffffff;
 329                 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
 330                     __put_user(tpc, (&pregs->tpc)) ||
 331                     __put_user(cregs->tnpc, (&pregs->tnpc)) ||
 332                     __put_user(cregs->y, (&pregs->y))) {
 333                         pt_error_return(regs, EFAULT);
 334                         goto out_tsk;
 335                 }
 336                 for (rval = 1; rval < 16; rval++)
 337                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 338                                 pt_error_return(regs, EFAULT);
 339                                 goto out_tsk;
 340                         }
 341                 pt_succ_return(regs, 0);
 342 #ifdef DEBUG_PTRACE
 343                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 344 #endif
 345                 goto out_tsk;
 346         }
 347
 348         case PTRACE_SETREGS: {
 349                 struct pt_regs32 __user *pregs =
 350                         (struct pt_regs32 __user *) addr;
 351                 struct pt_regs *cregs = task_pt_regs(child);
 352                 unsigned int psr, pc, npc, y;
 353                 int i;
 354
 355                 /* Must be careful, tracing process can only set certain
 356                  * bits in the psr.
 357                  */
 358                 if (__get_user(psr, (&pregs->psr)) ||
 359                     __get_user(pc, (&pregs->pc)) ||
 360                     __get_user(npc, (&pregs->npc)) ||
 361                     __get_user(y, (&pregs->y))) {
 362                         pt_error_return(regs, EFAULT);
 363                         goto out_tsk;
 364                 }
 365                 cregs->tstate &= ~(TSTATE_ICC);
 366                 cregs->tstate |= psr_to_tstate_icc(psr);
 367                 if (!((pc | npc) & 3)) {
 368                         cregs->tpc = pc;
 369                         cregs->tnpc = npc;
 370                 }
 371                 cregs->y = y;
 372                 for (i = 1; i < 16; i++) {
 373                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 374                                 pt_error_return(regs, EFAULT);
 375                                 goto out_tsk;
 376                         }
 377                 }
 378                 pt_succ_return(regs, 0);
 379                 goto out_tsk;
 380         }
 381
 382         case PTRACE_SETREGS64: {
 383                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 384                 struct pt_regs *cregs = task_pt_regs(child);
 385                 unsigned long tstate, tpc, tnpc, y;
 386                 int i;
 387
 388                 /* Must be careful, tracing process can only set certain
 389                  * bits in the psr.
 390                  */
 391                 if (__get_user(tstate, (&pregs->tstate)) ||
 392                     __get_user(tpc, (&pregs->tpc)) ||
 393                     __get_user(tnpc, (&pregs->tnpc)) ||
 394                     __get_user(y, (&pregs->y))) {
 395                         pt_error_return(regs, EFAULT);
 396                         goto out_tsk;
 397                 }
 398                 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0) {
 399                         tpc &= 0xffffffff;
 400                         tnpc &= 0xffffffff;
 401                 }
 402                 tstate &= (TSTATE_ICC | TSTATE_XCC);
 403                 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 404                 cregs->tstate |= tstate;
 405                 if (!((tpc | tnpc) & 3)) {
 406                         cregs->tpc = tpc;
 407                         cregs->tnpc = tnpc;
 408                 }
 409                 cregs->y = y;
 410                 for (i = 1; i < 16; i++) {
 411                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 412                                 pt_error_return(regs, EFAULT);
 413                                 goto out_tsk;
 414                         }
 415                 }
 416                 pt_succ_return(regs, 0);
 417                 goto out_tsk;
 418         }
 419
 420         case PTRACE_GETFPREGS: {
 421                 struct fps {
 422                         unsigned int regs[32];
 423                         unsigned int fsr;
 424                         unsigned int flags;
 425                         unsigned int extra;
 426                         unsigned int fpqd;
 427                         struct fq {
 428                                 unsigned int insnaddr;
 429                                 unsigned int insn;
 430                         } fpq[16];
 431                 };
 432                 struct fps __user *fps = (struct fps __user *) addr;
 433                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 434
 435                 if (copy_to_user(&fps->regs[0], fpregs,
 436                                  (32 * sizeof(unsigned int))) ||
 437                     __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr)) ||
 438                     __put_user(0, (&fps->fpqd)) ||
 439                     __put_user(0, (&fps->flags)) ||
 440                     __put_user(0, (&fps->extra)) ||
 441                     clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
 442                         pt_error_return(regs, EFAULT);
 443                         goto out_tsk;
 444                 }
 445                 pt_succ_return(regs, 0);
 446                 goto out_tsk;
 447         }
 448
 449         case PTRACE_GETFPREGS64: {
 450                 struct fps {
 451                         unsigned int regs[64];
 452                         unsigned long fsr;
 453                 };
 454                 struct fps __user *fps = (struct fps __user *) addr;
 455                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 456
 457                 if (copy_to_user(&fps->regs[0], fpregs,
 458                                  (64 * sizeof(unsigned int))) ||
 459                     __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
 460                         pt_error_return(regs, EFAULT);
 461                         goto out_tsk;
 462                 }
 463                 pt_succ_return(regs, 0);
 464                 goto out_tsk;
 465         }
 466
 467         case PTRACE_SETFPREGS: {
 468                 struct fps {
 469                         unsigned int regs[32];
 470                         unsigned int fsr;
 471                         unsigned int flags;
 472                         unsigned int extra;
 473                         unsigned int fpqd;
 474                         struct fq {
 475                                 unsigned int insnaddr;
 476                                 unsigned int insn;
 477                         } fpq[16];
 478                 };
 479                 struct fps __user *fps = (struct fps __user *) addr;
 480                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 481                 unsigned fsr;
 482
 483                 if (copy_from_user(fpregs, &fps->regs[0],
 484                                    (32 * sizeof(unsigned int))) ||
 485                     __get_user(fsr, (&fps->fsr))) {
 486                         pt_error_return(regs, EFAULT);
 487                         goto out_tsk;
 488                 }
 489                 task_thread_info(child)->xfsr[0] &= 0xffffffff00000000UL;
 490                 task_thread_info(child)->xfsr[0] |= fsr;
 491                 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
 492                         task_thread_info(child)->gsr[0] = 0;
 493                 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
 494                 pt_succ_return(regs, 0);
 495                 goto out_tsk;
 496         }
 497
 498         case PTRACE_SETFPREGS64: {
 499                 struct fps {
 500                         unsigned int regs[64];
 501                         unsigned long fsr;
 502                 };
 503                 struct fps __user *fps = (struct fps __user *) addr;
 504                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 505
 506                 if (copy_from_user(fpregs, &fps->regs[0],
 507                                    (64 * sizeof(unsigned int))) ||
 508                     __get_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
 509                         pt_error_return(regs, EFAULT);
 510                         goto out_tsk;
 511                 }
 512                 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
 513                         task_thread_info(child)->gsr[0] = 0;
 514                 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 515                 pt_succ_return(regs, 0);
 516                 goto out_tsk;
 517         }
 518
 519         case PTRACE_READTEXT:
 520         case PTRACE_READDATA: {
 521                 int res = ptrace_readdata(child, addr,
 522                                           (char __user *)addr2, data);
 523                 if (res == data) {
 524                         pt_succ_return(regs, 0);
 525                         goto out_tsk;
 526                 }
 527                 if (res >= 0)
 528                         res = -EIO;
 529                 pt_error_return(regs, -res);
 530                 goto out_tsk;
 531         }
 532
 533         case PTRACE_WRITETEXT:
 534         case PTRACE_WRITEDATA: {
 535                 int res = ptrace_writedata(child, (char __user *) addr2,
 536                                            addr, data);
 537                 if (res == data) {
 538                         pt_succ_return(regs, 0);
 539                         goto out_tsk;
 540                 }
 541                 if (res >= 0)
 542                         res = -EIO;
 543                 pt_error_return(regs, -res);
 544                 goto out_tsk;
 545         }
 546         case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
 547                 addr = 1;
 548
 549         case PTRACE_CONT: { /* restart after signal. */
 550                 if (!valid_signal(data)) {
 551                         pt_error_return(regs, EIO);
 552                         goto out_tsk;
 553                 }
 554
 555                 if (request == PTRACE_SYSCALL) {
 556                         set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 557                 } else {
 558                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 559                 }
 560
 561                 child->exit_code = data;
 562 #ifdef DEBUG_PTRACE
 563                 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
 564                         child->pid, child->exit_code,
 565                         task_pt_regs(child)->tpc,
 566                         task_pt_regs(child)->tnpc);
 567
 568 #endif
 569                 wake_up_process(child);
 570                 pt_succ_return(regs, 0);
 571                 goto out_tsk;
 572         }
 573
 574 /*
 575  * make the child exit.  Best I can do is send it a sigkill.
 576  * perhaps it should be put in the status that it wants to
 577  * exit.
 578  */
 579         case PTRACE_KILL: {
 580                 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
 581                         pt_succ_return(regs, 0);
 582                         goto out_tsk;
 583                 }
 584                 child->exit_code = SIGKILL;
 585                 wake_up_process(child);
 586                 pt_succ_return(regs, 0);
 587                 goto out_tsk;
 588         }
 589
 590         case PTRACE_SUNDETACH: { /* detach a process that was attached. */
 591                 int error = ptrace_detach(child, data);
 592                 if (error) {
 593                         pt_error_return(regs, EIO);
 594                         goto out_tsk;
 595                 }
 596                 pt_succ_return(regs, 0);
 597                 goto out_tsk;
 598         }
 599
 600         /* PTRACE_DUMPCORE unsupported... */
 601
 602         default: {
 603                 int err = ptrace_request(child, request, addr, data);
 604                 if (err)
 605                         pt_error_return(regs, -err);
 606                 else
 607                         pt_succ_return(regs, 0);
 608                 goto out_tsk;
 609         }
 610         }
 611 out_tsk:
 612         if (child)
 613                 put_task_struct(child);
 614 out:
 615         unlock_kernel();
 616 }
 617
 618 asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
 619 {
 620         /* do the secure computing check first */
 621         secure_computing(regs->u_regs[UREG_G1]);
 622
 623         if (unlikely(current->audit_context) && syscall_exit_p) {
 624                 unsigned long tstate = regs->tstate;
 625                 int result = AUDITSC_SUCCESS;
 626
 627                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
 628                         result = AUDITSC_FAILURE;
 629
 630                 audit_syscall_exit(current, result, regs->u_regs[UREG_I0]);
 631         }
 632
 633         if (!(current->ptrace & PT_PTRACED))
 634                 goto out;
 635
 636         if (!test_thread_flag(TIF_SYSCALL_TRACE))
 637                 goto out;
 638
 639         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 640                                  ? 0x80 : 0));
 641
 642         /*
 643          * this isn't the same as continuing with a signal, but it will do
 644          * for normal use.  strace only continues with a signal if the
 645          * stopping signal is not SIGTRAP.  -brl
 646          */
 647         if (current->exit_code) {
 648                 send_sig(current->exit_code, current, 1);
 649                 current->exit_code = 0;
 650         }
 651
 652 out:
 653         if (unlikely(current->audit_context) && !syscall_exit_p)
 654                 audit_syscall_entry(current,
 655                                     (test_thread_flag(TIF_32BIT) ?
 656                                      AUDIT_ARCH_SPARC :
 657                                      AUDIT_ARCH_SPARC64),
 658                                     regs->u_regs[UREG_G1],
 659                                     regs->u_regs[UREG_I0],
 660                                     regs->u_regs[UREG_I1],
 661                                     regs->u_regs[UREG_I2],
 662                                     regs->u_regs[UREG_I3]);
 663 }