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