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 #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         if (tlb_type == hypervisor)
 128                 return;
 129
 130 #ifdef DCACHE_ALIASING_POSSIBLE
 131         /* If bit 13 of the kernel address we used to access the
 132          * user page is the same as the virtual address that page
 133          * is mapped to in the user's address space, we can skip the
 134          * D-cache flush.
 135          */
 136         if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
 137                 unsigned long start = __pa(kaddr);
 138                 unsigned long end = start + len;
 139                 unsigned long dcache_line_size;
 140
 141                 dcache_line_size = local_cpu_data().dcache_line_size;
 142
 143                 if (tlb_type == spitfire) {
 144                         for (; start < end; start += dcache_line_size)
 145                                 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
 146                 } else {
 147                         start &= ~(dcache_line_size - 1);
 148                         for (; start < end; start += dcache_line_size)
 149                                 __asm__ __volatile__(
 150                                         "stxa %%g0, [%0] %1\n\t"
 151                                         "membar #Sync"
 152                                         : /* no outputs */
 153                                         : "r" (start),
 154                                         "i" (ASI_DCACHE_INVALIDATE));
 155                 }
 156         }
 157 #endif
 158         if (write && tlb_type == spitfire) {
 159                 unsigned long start = (unsigned long) kaddr;
 160                 unsigned long end = start + len;
 161                 unsigned long icache_line_size;
 162
 163                 icache_line_size = local_cpu_data().icache_line_size;
 164
 165                 for (; start < end; start += icache_line_size)
 166                         flushi(start);
 167         }
 168 }
 169
 170 asmlinkage void do_ptrace(struct pt_regs *regs)
 171 {
 172         int request = regs->u_regs[UREG_I0];
 173         pid_t pid = regs->u_regs[UREG_I1];
 174         unsigned long addr = regs->u_regs[UREG_I2];
 175         unsigned long data = regs->u_regs[UREG_I3];
 176         unsigned long addr2 = regs->u_regs[UREG_I4];
 177         struct task_struct *child;
 178         int ret;
 179
 180         if (test_thread_flag(TIF_32BIT)) {
 181                 addr &= 0xffffffffUL;
 182                 data &= 0xffffffffUL;
 183                 addr2 &= 0xffffffffUL;
 184         }
 185         lock_kernel();
 186 #ifdef DEBUG_PTRACE
 187         {
 188                 char *s;
 189
 190                 if ((request >= 0) && (request <= 24))
 191                         s = pt_rq [request];
 192                 else
 193                         s = "unknown";
 194
 195                 if (request == PTRACE_POKEDATA && data == 0x91d02001){
 196                         printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
 197                                 pid, addr, addr2);
 198                 } else
 199                         printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
 200                                s, request, pid, addr, data, addr2);
 201         }
 202 #endif
 203         if (request == PTRACE_TRACEME) {
 204                 ret = ptrace_traceme();
 205                 pt_succ_return(regs, 0);
 206                 goto out;
 207         }
 208
 209         child = ptrace_get_task_struct(pid);
 210         if (IS_ERR(child)) {
 211                 ret = PTR_ERR(child);
 212                 pt_error_return(regs, -ret);
 213                 goto out;
 214         }
 215
 216         if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
 217             || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
 218                 if (ptrace_attach(child)) {
 219                         pt_error_return(regs, EPERM);
 220                         goto out_tsk;
 221                 }
 222                 pt_succ_return(regs, 0);
 223                 goto out_tsk;
 224         }
 225
 226         ret = ptrace_check_attach(child, request == PTRACE_KILL);
 227         if (ret < 0) {
 228                 pt_error_return(regs, -ret);
 229                 goto out_tsk;
 230         }
 231
 232         if (!(test_thread_flag(TIF_32BIT))      &&
 233             ((request == PTRACE_READDATA64)             ||
 234              (request == PTRACE_WRITEDATA64)            ||
 235              (request == PTRACE_READTEXT64)             ||
 236              (request == PTRACE_WRITETEXT64)            ||
 237              (request == PTRACE_PEEKTEXT64)             ||
 238              (request == PTRACE_POKETEXT64)             ||
 239              (request == PTRACE_PEEKDATA64)             ||
 240              (request == PTRACE_POKEDATA64))) {
 241                 addr = regs->u_regs[UREG_G2];
 242                 addr2 = regs->u_regs[UREG_G3];
 243                 request -= 30; /* wheee... */
 244         }
 245
 246         switch(request) {
 247         case PTRACE_PEEKUSR:
 248                 if (addr != 0)
 249                         pt_error_return(regs, EIO);
 250                 else
 251                         pt_succ_return(regs, 0);
 252                 goto out_tsk;
 253
 254         case PTRACE_PEEKTEXT: /* read word at location addr. */
 255         case PTRACE_PEEKDATA: {
 256                 unsigned long tmp64;
 257                 unsigned int tmp32;
 258                 int res, copied;
 259
 260                 res = -EIO;
 261                 if (test_thread_flag(TIF_32BIT)) {
 262                         copied = access_process_vm(child, addr,
 263                                                    &tmp32, sizeof(tmp32), 0);
 264                         tmp64 = (unsigned long) tmp32;
 265                         if (copied == sizeof(tmp32))
 266                                 res = 0;
 267                 } else {
 268                         copied = access_process_vm(child, addr,
 269                                                    &tmp64, sizeof(tmp64), 0);
 270                         if (copied == sizeof(tmp64))
 271                                 res = 0;
 272                 }
 273                 if (res < 0)
 274                         pt_error_return(regs, -res);
 275                 else
 276                         pt_os_succ_return(regs, tmp64, (void __user *) data);
 277                 goto out_tsk;
 278         }
 279
 280         case PTRACE_POKETEXT: /* write the word at location addr. */
 281         case PTRACE_POKEDATA: {
 282                 unsigned long tmp64;
 283                 unsigned int tmp32;
 284                 int copied, res = -EIO;
 285
 286                 if (test_thread_flag(TIF_32BIT)) {
 287                         tmp32 = data;
 288                         copied = access_process_vm(child, addr,
 289                                                    &tmp32, sizeof(tmp32), 1);
 290                         if (copied == sizeof(tmp32))
 291                                 res = 0;
 292                 } else {
 293                         tmp64 = data;
 294                         copied = access_process_vm(child, addr,
 295                                                    &tmp64, sizeof(tmp64), 1);
 296                         if (copied == sizeof(tmp64))
 297                                 res = 0;
 298                 }
 299                 if (res < 0)
 300                         pt_error_return(regs, -res);
 301                 else
 302                         pt_succ_return(regs, res);
 303                 goto out_tsk;
 304         }
 305
 306         case PTRACE_GETREGS: {
 307                 struct pt_regs32 __user *pregs =
 308                         (struct pt_regs32 __user *) addr;
 309                 struct pt_regs *cregs = task_pt_regs(child);
 310                 int rval;
 311
 312                 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
 313                     __put_user(cregs->tpc, (&pregs->pc)) ||
 314                     __put_user(cregs->tnpc, (&pregs->npc)) ||
 315                     __put_user(cregs->y, (&pregs->y))) {
 316                         pt_error_return(regs, EFAULT);
 317                         goto out_tsk;
 318                 }
 319                 for (rval = 1; rval < 16; rval++)
 320                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 321                                 pt_error_return(regs, EFAULT);
 322                                 goto out_tsk;
 323                         }
 324                 pt_succ_return(regs, 0);
 325 #ifdef DEBUG_PTRACE
 326                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 327 #endif
 328                 goto out_tsk;
 329         }
 330
 331         case PTRACE_GETREGS64: {
 332                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 333                 struct pt_regs *cregs = task_pt_regs(child);
 334                 unsigned long tpc = cregs->tpc;
 335                 int rval;
 336
 337                 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0)
 338                         tpc &= 0xffffffff;
 339                 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
 340                     __put_user(tpc, (&pregs->tpc)) ||
 341                     __put_user(cregs->tnpc, (&pregs->tnpc)) ||
 342                     __put_user(cregs->y, (&pregs->y))) {
 343                         pt_error_return(regs, EFAULT);
 344                         goto out_tsk;
 345                 }
 346                 for (rval = 1; rval < 16; rval++)
 347                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 348                                 pt_error_return(regs, EFAULT);
 349                                 goto out_tsk;
 350                         }
 351                 pt_succ_return(regs, 0);
 352 #ifdef DEBUG_PTRACE
 353                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 354 #endif
 355                 goto out_tsk;
 356         }
 357
 358         case PTRACE_SETREGS: {
 359                 struct pt_regs32 __user *pregs =
 360                         (struct pt_regs32 __user *) addr;
 361                 struct pt_regs *cregs = task_pt_regs(child);
 362                 unsigned int psr, pc, npc, y;
 363                 int i;
 364
 365                 /* Must be careful, tracing process can only set certain
 366                  * bits in the psr.
 367                  */
 368                 if (__get_user(psr, (&pregs->psr)) ||
 369                     __get_user(pc, (&pregs->pc)) ||
 370                     __get_user(npc, (&pregs->npc)) ||
 371                     __get_user(y, (&pregs->y))) {
 372                         pt_error_return(regs, EFAULT);
 373                         goto out_tsk;
 374                 }
 375                 cregs->tstate &= ~(TSTATE_ICC);
 376                 cregs->tstate |= psr_to_tstate_icc(psr);
 377                 if (!((pc | npc) & 3)) {
 378                         cregs->tpc = pc;
 379                         cregs->tnpc = npc;
 380                 }
 381                 cregs->y = y;
 382                 for (i = 1; i < 16; i++) {
 383                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 384                                 pt_error_return(regs, EFAULT);
 385                                 goto out_tsk;
 386                         }
 387                 }
 388                 pt_succ_return(regs, 0);
 389                 goto out_tsk;
 390         }
 391
 392         case PTRACE_SETREGS64: {
 393                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 394                 struct pt_regs *cregs = task_pt_regs(child);
 395                 unsigned long tstate, tpc, tnpc, y;
 396                 int i;
 397
 398                 /* Must be careful, tracing process can only set certain
 399                  * bits in the psr.
 400                  */
 401                 if (__get_user(tstate, (&pregs->tstate)) ||
 402                     __get_user(tpc, (&pregs->tpc)) ||
 403                     __get_user(tnpc, (&pregs->tnpc)) ||
 404                     __get_user(y, (&pregs->y))) {
 405                         pt_error_return(regs, EFAULT);
 406                         goto out_tsk;
 407                 }
 408                 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0) {
 409                         tpc &= 0xffffffff;
 410                         tnpc &= 0xffffffff;
 411                 }
 412                 tstate &= (TSTATE_ICC | TSTATE_XCC);
 413                 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 414                 cregs->tstate |= tstate;
 415                 if (!((tpc | tnpc) & 3)) {
 416                         cregs->tpc = tpc;
 417                         cregs->tnpc = tnpc;
 418                 }
 419                 cregs->y = y;
 420                 for (i = 1; i < 16; i++) {
 421                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 422                                 pt_error_return(regs, EFAULT);
 423                                 goto out_tsk;
 424                         }
 425                 }
 426                 pt_succ_return(regs, 0);
 427                 goto out_tsk;
 428         }
 429
 430         case PTRACE_GETFPREGS: {
 431                 struct fps {
 432                         unsigned int regs[32];
 433                         unsigned int fsr;
 434                         unsigned int flags;
 435                         unsigned int extra;
 436                         unsigned int fpqd;
 437                         struct fq {
 438                                 unsigned int insnaddr;
 439                                 unsigned int insn;
 440                         } fpq[16];
 441                 };
 442                 struct fps __user *fps = (struct fps __user *) addr;
 443                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 444
 445                 if (copy_to_user(&fps->regs[0], fpregs,
 446                                  (32 * sizeof(unsigned int))) ||
 447                     __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr)) ||
 448                     __put_user(0, (&fps->fpqd)) ||
 449                     __put_user(0, (&fps->flags)) ||
 450                     __put_user(0, (&fps->extra)) ||
 451                     clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
 452                         pt_error_return(regs, EFAULT);
 453                         goto out_tsk;
 454                 }
 455                 pt_succ_return(regs, 0);
 456                 goto out_tsk;
 457         }
 458
 459         case PTRACE_GETFPREGS64: {
 460                 struct fps {
 461                         unsigned int regs[64];
 462                         unsigned long fsr;
 463                 };
 464                 struct fps __user *fps = (struct fps __user *) addr;
 465                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 466
 467                 if (copy_to_user(&fps->regs[0], fpregs,
 468                                  (64 * sizeof(unsigned int))) ||
 469                     __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
 470                         pt_error_return(regs, EFAULT);
 471                         goto out_tsk;
 472                 }
 473                 pt_succ_return(regs, 0);
 474                 goto out_tsk;
 475         }
 476
 477         case PTRACE_SETFPREGS: {
 478                 struct fps {
 479                         unsigned int regs[32];
 480                         unsigned int fsr;
 481                         unsigned int flags;
 482                         unsigned int extra;
 483                         unsigned int fpqd;
 484                         struct fq {
 485                                 unsigned int insnaddr;
 486                                 unsigned int insn;
 487                         } fpq[16];
 488                 };
 489                 struct fps __user *fps = (struct fps __user *) addr;
 490                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 491                 unsigned fsr;
 492
 493                 if (copy_from_user(fpregs, &fps->regs[0],
 494                                    (32 * sizeof(unsigned int))) ||
 495                     __get_user(fsr, (&fps->fsr))) {
 496                         pt_error_return(regs, EFAULT);
 497                         goto out_tsk;
 498                 }
 499                 task_thread_info(child)->xfsr[0] &= 0xffffffff00000000UL;
 500                 task_thread_info(child)->xfsr[0] |= fsr;
 501                 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
 502                         task_thread_info(child)->gsr[0] = 0;
 503                 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
 504                 pt_succ_return(regs, 0);
 505                 goto out_tsk;
 506         }
 507
 508         case PTRACE_SETFPREGS64: {
 509                 struct fps {
 510                         unsigned int regs[64];
 511                         unsigned long fsr;
 512                 };
 513                 struct fps __user *fps = (struct fps __user *) addr;
 514                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 515
 516                 if (copy_from_user(fpregs, &fps->regs[0],
 517                                    (64 * sizeof(unsigned int))) ||
 518                     __get_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
 519                         pt_error_return(regs, EFAULT);
 520                         goto out_tsk;
 521                 }
 522                 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
 523                         task_thread_info(child)->gsr[0] = 0;
 524                 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 525                 pt_succ_return(regs, 0);
 526                 goto out_tsk;
 527         }
 528
 529         case PTRACE_READTEXT:
 530         case PTRACE_READDATA: {
 531                 int res = ptrace_readdata(child, addr,
 532                                           (char __user *)addr2, data);
 533                 if (res == data) {
 534                         pt_succ_return(regs, 0);
 535                         goto out_tsk;
 536                 }
 537                 if (res >= 0)
 538                         res = -EIO;
 539                 pt_error_return(regs, -res);
 540                 goto out_tsk;
 541         }
 542
 543         case PTRACE_WRITETEXT:
 544         case PTRACE_WRITEDATA: {
 545                 int res = ptrace_writedata(child, (char __user *) addr2,
 546                                            addr, data);
 547                 if (res == data) {
 548                         pt_succ_return(regs, 0);
 549                         goto out_tsk;
 550                 }
 551                 if (res >= 0)
 552                         res = -EIO;
 553                 pt_error_return(regs, -res);
 554                 goto out_tsk;
 555         }
 556         case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
 557                 addr = 1;
 558
 559         case PTRACE_CONT: { /* restart after signal. */
 560                 if (!valid_signal(data)) {
 561                         pt_error_return(regs, EIO);
 562                         goto out_tsk;
 563                 }
 564
 565                 if (request == PTRACE_SYSCALL) {
 566                         set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 567                 } else {
 568                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 569                 }
 570
 571                 child->exit_code = data;
 572 #ifdef DEBUG_PTRACE
 573                 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
 574                         child->pid, child->exit_code,
 575                         task_pt_regs(child)->tpc,
 576                         task_pt_regs(child)->tnpc);
 577
 578 #endif
 579                 wake_up_process(child);
 580                 pt_succ_return(regs, 0);
 581                 goto out_tsk;
 582         }
 583
 584 /*
 585  * make the child exit.  Best I can do is send it a sigkill.
 586  * perhaps it should be put in the status that it wants to
 587  * exit.
 588  */
 589         case PTRACE_KILL: {
 590                 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
 591                         pt_succ_return(regs, 0);
 592                         goto out_tsk;
 593                 }
 594                 child->exit_code = SIGKILL;
 595                 wake_up_process(child);
 596                 pt_succ_return(regs, 0);
 597                 goto out_tsk;
 598         }
 599
 600         case PTRACE_SUNDETACH: { /* detach a process that was attached. */
 601                 int error = ptrace_detach(child, data);
 602                 if (error) {
 603                         pt_error_return(regs, EIO);
 604                         goto out_tsk;
 605                 }
 606                 pt_succ_return(regs, 0);
 607                 goto out_tsk;
 608         }
 609
 610         /* PTRACE_DUMPCORE unsupported... */
 611
 612         case PTRACE_GETEVENTMSG: {
 613                 int err;
 614
 615                 if (test_thread_flag(TIF_32BIT))
 616                         err = put_user(child->ptrace_message,
 617                                        (unsigned int __user *) data);
 618                 else
 619                         err = put_user(child->ptrace_message,
 620                                        (unsigned long __user *) data);
 621                 if (err)
 622                         pt_error_return(regs, -err);
 623                 else
 624                         pt_succ_return(regs, 0);
 625                 break;
 626         }
 627
 628         default: {
 629                 int err = ptrace_request(child, request, addr, data);
 630                 if (err)
 631                         pt_error_return(regs, -err);
 632                 else
 633                         pt_succ_return(regs, 0);
 634                 goto out_tsk;
 635         }
 636         }
 637 out_tsk:
 638         if (child)
 639                 put_task_struct(child);
 640 out:
 641         unlock_kernel();
 642 }
 643
 644 asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
 645 {
 646         /* do the secure computing check first */
 647         secure_computing(regs->u_regs[UREG_G1]);
 648
 649         if (unlikely(current->audit_context) && syscall_exit_p) {
 650                 unsigned long tstate = regs->tstate;
 651                 int result = AUDITSC_SUCCESS;
 652
 653                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
 654                         result = AUDITSC_FAILURE;
 655
 656                 audit_syscall_exit(result, regs->u_regs[UREG_I0]);
 657         }
 658
 659         if (!(current->ptrace & PT_PTRACED))
 660                 goto out;
 661
 662         if (!test_thread_flag(TIF_SYSCALL_TRACE))
 663                 goto out;
 664
 665         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 666                                  ? 0x80 : 0));
 667
 668         /*
 669          * this isn't the same as continuing with a signal, but it will do
 670          * for normal use.  strace only continues with a signal if the
 671          * stopping signal is not SIGTRAP.  -brl
 672          */
 673         if (current->exit_code) {
 674                 send_sig(current->exit_code, current, 1);
 675                 current->exit_code = 0;
 676         }
 677
 678 out:
 679         if (unlikely(current->audit_context) && !syscall_exit_p)
 680                 audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
 681                                      AUDIT_ARCH_SPARC :
 682                                      AUDIT_ARCH_SPARC64),
 683                                     regs->u_regs[UREG_G1],
 684                                     regs->u_regs[UREG_I0],
 685                                     regs->u_regs[UREG_I1],
 686                                     regs->u_regs[UREG_I2],
 687                                     regs->u_regs[UREG_I3]);
 688 }