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
  23 #include <asm/asi.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/system.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/psrcompat.h>
  28 #include <asm/visasm.h>
  29 #include <asm/spitfire.h>
  30
  31 /* Returning from ptrace is a bit tricky because the syscall return
  32  * low level code assumes any value returned which is negative and
  33  * is a valid errno will mean setting the condition codes to indicate
  34  * an error return.  This doesn't work, so we have this hook.
  35  */
  36 static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
  37 {
  38         regs->u_regs[UREG_I0] = error;
  39         regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY);
  40         regs->tpc = regs->tnpc;
  41         regs->tnpc += 4;
  42 }
  43
  44 static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
  45 {
  46         regs->u_regs[UREG_I0] = value;
  47         regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
  48         regs->tpc = regs->tnpc;
  49         regs->tnpc += 4;
  50 }
  51
  52 static inline void
  53 pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr)
  54 {
  55         if (test_thread_flag(TIF_32BIT)) {
  56                 if (put_user(value, (unsigned int __user *) addr)) {
  57                         pt_error_return(regs, EFAULT);
  58                         return;
  59                 }
  60         } else {
  61                 if (put_user(value, (long __user *) addr)) {
  62                         pt_error_return(regs, EFAULT);
  63                         return;
  64                 }
  65         }
  66         regs->u_regs[UREG_I0] = 0;
  67         regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
  68         regs->tpc = regs->tnpc;
  69         regs->tnpc += 4;
  70 }
  71
  72 static void
  73 pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr)
  74 {
  75         if (current->personality == PER_SUNOS)
  76                 pt_succ_return (regs, val);
  77         else
  78                 pt_succ_return_linux (regs, val, addr);
  79 }
  80
  81 /* #define ALLOW_INIT_TRACING */
  82 /* #define DEBUG_PTRACE */
  83
  84 #ifdef DEBUG_PTRACE
  85 char *pt_rq [] = {
  86         /* 0  */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
  87         /* 4  */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
  88         /* 8  */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
  89         /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
  90         /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
  91         /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
  92         /* 24 */ "SYSCALL", ""
  93 };
  94 #endif
  95
  96 /*
  97  * Called by kernel/ptrace.c when detaching..
  98  *
  99  * Make sure single step bits etc are not set.
 100  */
 101 void ptrace_disable(struct task_struct *child)
 102 {
 103         /* nothing to do */
 104 }
 105
 106 asmlinkage void do_ptrace(struct pt_regs *regs)
 107 {
 108         int request = regs->u_regs[UREG_I0];
 109         pid_t pid = regs->u_regs[UREG_I1];
 110         unsigned long addr = regs->u_regs[UREG_I2];
 111         unsigned long data = regs->u_regs[UREG_I3];
 112         unsigned long addr2 = regs->u_regs[UREG_I4];
 113         struct task_struct *child;
 114         int ret;
 115
 116         if (test_thread_flag(TIF_32BIT)) {
 117                 addr &= 0xffffffffUL;
 118                 data &= 0xffffffffUL;
 119                 addr2 &= 0xffffffffUL;
 120         }
 121         lock_kernel();
 122 #ifdef DEBUG_PTRACE
 123         {
 124                 char *s;
 125
 126                 if ((request >= 0) && (request <= 24))
 127                         s = pt_rq [request];
 128                 else
 129                         s = "unknown";
 130
 131                 if (request == PTRACE_POKEDATA && data == 0x91d02001){
 132                         printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
 133                                 pid, addr, addr2);
 134                 } else
 135                         printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
 136                                s, request, pid, addr, data, addr2);
 137         }
 138 #endif
 139         if (request == PTRACE_TRACEME) {
 140                 int ret;
 141
 142                 /* are we already being traced? */
 143                 if (current->ptrace & PT_PTRACED) {
 144                         pt_error_return(regs, EPERM);
 145                         goto out;
 146                 }
 147                 ret = security_ptrace(current->parent, current);
 148                 if (ret) {
 149                         pt_error_return(regs, -ret);
 150                         goto out;
 151                 }
 152
 153                 /* set the ptrace bit in the process flags. */
 154                 current->ptrace |= PT_PTRACED;
 155                 pt_succ_return(regs, 0);
 156                 goto out;
 157         }
 158 #ifndef ALLOW_INIT_TRACING
 159         if (pid == 1) {
 160                 /* Can't dork with init. */
 161                 pt_error_return(regs, EPERM);
 162                 goto out;
 163         }
 164 #endif
 165         read_lock(&tasklist_lock);
 166         child = find_task_by_pid(pid);
 167         if (child)
 168                 get_task_struct(child);
 169         read_unlock(&tasklist_lock);
 170
 171         if (!child) {
 172                 pt_error_return(regs, ESRCH);
 173                 goto out;
 174         }
 175
 176         if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
 177             || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
 178                 if (ptrace_attach(child)) {
 179                         pt_error_return(regs, EPERM);
 180                         goto out_tsk;
 181                 }
 182                 pt_succ_return(regs, 0);
 183                 goto out_tsk;
 184         }
 185
 186         ret = ptrace_check_attach(child, request == PTRACE_KILL);
 187         if (ret < 0) {
 188                 pt_error_return(regs, -ret);
 189                 goto out_tsk;
 190         }
 191
 192         if (!(test_thread_flag(TIF_32BIT))      &&
 193             ((request == PTRACE_READDATA64)             ||
 194              (request == PTRACE_WRITEDATA64)            ||
 195              (request == PTRACE_READTEXT64)             ||
 196              (request == PTRACE_WRITETEXT64)            ||
 197              (request == PTRACE_PEEKTEXT64)             ||
 198              (request == PTRACE_POKETEXT64)             ||
 199              (request == PTRACE_PEEKDATA64)             ||
 200              (request == PTRACE_POKEDATA64))) {
 201                 addr = regs->u_regs[UREG_G2];
 202                 addr2 = regs->u_regs[UREG_G3];
 203                 request -= 30; /* wheee... */
 204         }
 205
 206         switch(request) {
 207         case PTRACE_PEEKTEXT: /* read word at location addr. */
 208         case PTRACE_PEEKDATA: {
 209                 unsigned long tmp64;
 210                 unsigned int tmp32;
 211                 int res, copied;
 212
 213                 res = -EIO;
 214                 if (test_thread_flag(TIF_32BIT)) {
 215                         copied = access_process_vm(child, addr,
 216                                                    &tmp32, sizeof(tmp32), 0);
 217                         tmp64 = (unsigned long) tmp32;
 218                         if (copied == sizeof(tmp32))
 219                                 res = 0;
 220                 } else {
 221                         copied = access_process_vm(child, addr,
 222                                                    &tmp64, sizeof(tmp64), 0);
 223                         if (copied == sizeof(tmp64))
 224                                 res = 0;
 225                 }
 226                 if (res < 0)
 227                         pt_error_return(regs, -res);
 228                 else
 229                         pt_os_succ_return(regs, tmp64, (void __user *) data);
 230                 goto flush_and_out;
 231         }
 232
 233         case PTRACE_POKETEXT: /* write the word at location addr. */
 234         case PTRACE_POKEDATA: {
 235                 unsigned long tmp64;
 236                 unsigned int tmp32;
 237                 int copied, res = -EIO;
 238
 239                 if (test_thread_flag(TIF_32BIT)) {
 240                         tmp32 = data;
 241                         copied = access_process_vm(child, addr,
 242                                                    &tmp32, sizeof(tmp32), 1);
 243                         if (copied == sizeof(tmp32))
 244                                 res = 0;
 245                 } else {
 246                         tmp64 = data;
 247                         copied = access_process_vm(child, addr,
 248                                                    &tmp64, sizeof(tmp64), 1);
 249                         if (copied == sizeof(tmp64))
 250                                 res = 0;
 251                 }
 252                 if (res < 0)
 253                         pt_error_return(regs, -res);
 254                 else
 255                         pt_succ_return(regs, res);
 256                 goto flush_and_out;
 257         }
 258
 259         case PTRACE_GETREGS: {
 260                 struct pt_regs32 __user *pregs =
 261                         (struct pt_regs32 __user *) addr;
 262                 struct pt_regs *cregs = child->thread_info->kregs;
 263                 int rval;
 264
 265                 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
 266                     __put_user(cregs->tpc, (&pregs->pc)) ||
 267                     __put_user(cregs->tnpc, (&pregs->npc)) ||
 268                     __put_user(cregs->y, (&pregs->y))) {
 269                         pt_error_return(regs, EFAULT);
 270                         goto out_tsk;
 271                 }
 272                 for (rval = 1; rval < 16; rval++)
 273                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 274                                 pt_error_return(regs, EFAULT);
 275                                 goto out_tsk;
 276                         }
 277                 pt_succ_return(regs, 0);
 278 #ifdef DEBUG_PTRACE
 279                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 280 #endif
 281                 goto out_tsk;
 282         }
 283
 284         case PTRACE_GETREGS64: {
 285                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 286                 struct pt_regs *cregs = child->thread_info->kregs;
 287                 unsigned long tpc = cregs->tpc;
 288                 int rval;
 289
 290                 if ((child->thread_info->flags & _TIF_32BIT) != 0)
 291                         tpc &= 0xffffffff;
 292                 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
 293                     __put_user(tpc, (&pregs->tpc)) ||
 294                     __put_user(cregs->tnpc, (&pregs->tnpc)) ||
 295                     __put_user(cregs->y, (&pregs->y))) {
 296                         pt_error_return(regs, EFAULT);
 297                         goto out_tsk;
 298                 }
 299                 for (rval = 1; rval < 16; rval++)
 300                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 301                                 pt_error_return(regs, EFAULT);
 302                                 goto out_tsk;
 303                         }
 304                 pt_succ_return(regs, 0);
 305 #ifdef DEBUG_PTRACE
 306                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 307 #endif
 308                 goto out_tsk;
 309         }
 310
 311         case PTRACE_SETREGS: {
 312                 struct pt_regs32 __user *pregs =
 313                         (struct pt_regs32 __user *) addr;
 314                 struct pt_regs *cregs = child->thread_info->kregs;
 315                 unsigned int psr, pc, npc, y;
 316                 int i;
 317
 318                 /* Must be careful, tracing process can only set certain
 319                  * bits in the psr.
 320                  */
 321                 if (__get_user(psr, (&pregs->psr)) ||
 322                     __get_user(pc, (&pregs->pc)) ||
 323                     __get_user(npc, (&pregs->npc)) ||
 324                     __get_user(y, (&pregs->y))) {
 325                         pt_error_return(regs, EFAULT);
 326                         goto out_tsk;
 327                 }
 328                 cregs->tstate &= ~(TSTATE_ICC);
 329                 cregs->tstate |= psr_to_tstate_icc(psr);
 330                 if (!((pc | npc) & 3)) {
 331                         cregs->tpc = pc;
 332                         cregs->tnpc = npc;
 333                 }
 334                 cregs->y = y;
 335                 for (i = 1; i < 16; i++) {
 336                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 337                                 pt_error_return(regs, EFAULT);
 338                                 goto out_tsk;
 339                         }
 340                 }
 341                 pt_succ_return(regs, 0);
 342                 goto out_tsk;
 343         }
 344
 345         case PTRACE_SETREGS64: {
 346                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 347                 struct pt_regs *cregs = child->thread_info->kregs;
 348                 unsigned long tstate, tpc, tnpc, y;
 349                 int i;
 350
 351                 /* Must be careful, tracing process can only set certain
 352                  * bits in the psr.
 353                  */
 354                 if (__get_user(tstate, (&pregs->tstate)) ||
 355                     __get_user(tpc, (&pregs->tpc)) ||
 356                     __get_user(tnpc, (&pregs->tnpc)) ||
 357                     __get_user(y, (&pregs->y))) {
 358                         pt_error_return(regs, EFAULT);
 359                         goto out_tsk;
 360                 }
 361                 if ((child->thread_info->flags & _TIF_32BIT) != 0) {
 362                         tpc &= 0xffffffff;
 363                         tnpc &= 0xffffffff;
 364                 }
 365                 tstate &= (TSTATE_ICC | TSTATE_XCC);
 366                 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 367                 cregs->tstate |= tstate;
 368                 if (!((tpc | tnpc) & 3)) {
 369                         cregs->tpc = tpc;
 370                         cregs->tnpc = tnpc;
 371                 }
 372                 cregs->y = y;
 373                 for (i = 1; i < 16; i++) {
 374                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 375                                 pt_error_return(regs, EFAULT);
 376                                 goto out_tsk;
 377                         }
 378                 }
 379                 pt_succ_return(regs, 0);
 380                 goto out_tsk;
 381         }
 382
 383         case PTRACE_GETFPREGS: {
 384                 struct fps {
 385                         unsigned int regs[32];
 386                         unsigned int fsr;
 387                         unsigned int flags;
 388                         unsigned int extra;
 389                         unsigned int fpqd;
 390                         struct fq {
 391                                 unsigned int insnaddr;
 392                                 unsigned int insn;
 393                         } fpq[16];
 394                 };
 395                 struct fps __user *fps = (struct fps __user *) addr;
 396                 unsigned long *fpregs = child->thread_info->fpregs;
 397
 398                 if (copy_to_user(&fps->regs[0], fpregs,
 399                                  (32 * sizeof(unsigned int))) ||
 400                     __put_user(child->thread_info->xfsr[0], (&fps->fsr)) ||
 401                     __put_user(0, (&fps->fpqd)) ||
 402                     __put_user(0, (&fps->flags)) ||
 403                     __put_user(0, (&fps->extra)) ||
 404                     clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
 405                         pt_error_return(regs, EFAULT);
 406                         goto out_tsk;
 407                 }
 408                 pt_succ_return(regs, 0);
 409                 goto out_tsk;
 410         }
 411
 412         case PTRACE_GETFPREGS64: {
 413                 struct fps {
 414                         unsigned int regs[64];
 415                         unsigned long fsr;
 416                 };
 417                 struct fps __user *fps = (struct fps __user *) addr;
 418                 unsigned long *fpregs = child->thread_info->fpregs;
 419
 420                 if (copy_to_user(&fps->regs[0], fpregs,
 421                                  (64 * sizeof(unsigned int))) ||
 422                     __put_user(child->thread_info->xfsr[0], (&fps->fsr))) {
 423                         pt_error_return(regs, EFAULT);
 424                         goto out_tsk;
 425                 }
 426                 pt_succ_return(regs, 0);
 427                 goto out_tsk;
 428         }
 429
 430         case PTRACE_SETFPREGS: {
 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 = child->thread_info->fpregs;
 444                 unsigned fsr;
 445
 446                 if (copy_from_user(fpregs, &fps->regs[0],
 447                                    (32 * sizeof(unsigned int))) ||
 448                     __get_user(fsr, (&fps->fsr))) {
 449                         pt_error_return(regs, EFAULT);
 450                         goto out_tsk;
 451                 }
 452                 child->thread_info->xfsr[0] &= 0xffffffff00000000UL;
 453                 child->thread_info->xfsr[0] |= fsr;
 454                 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
 455                         child->thread_info->gsr[0] = 0;
 456                 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
 457                 pt_succ_return(regs, 0);
 458                 goto out_tsk;
 459         }
 460
 461         case PTRACE_SETFPREGS64: {
 462                 struct fps {
 463                         unsigned int regs[64];
 464                         unsigned long fsr;
 465                 };
 466                 struct fps __user *fps = (struct fps __user *) addr;
 467                 unsigned long *fpregs = child->thread_info->fpregs;
 468
 469                 if (copy_from_user(fpregs, &fps->regs[0],
 470                                    (64 * sizeof(unsigned int))) ||
 471                     __get_user(child->thread_info->xfsr[0], (&fps->fsr))) {
 472                         pt_error_return(regs, EFAULT);
 473                         goto out_tsk;
 474                 }
 475                 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
 476                         child->thread_info->gsr[0] = 0;
 477                 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 478                 pt_succ_return(regs, 0);
 479                 goto out_tsk;
 480         }
 481
 482         case PTRACE_READTEXT:
 483         case PTRACE_READDATA: {
 484                 int res = ptrace_readdata(child, addr,
 485                                           (char __user *)addr2, data);
 486                 if (res == data) {
 487                         pt_succ_return(regs, 0);
 488                         goto flush_and_out;
 489                 }
 490                 if (res >= 0)
 491                         res = -EIO;
 492                 pt_error_return(regs, -res);
 493                 goto flush_and_out;
 494         }
 495
 496         case PTRACE_WRITETEXT:
 497         case PTRACE_WRITEDATA: {
 498                 int res = ptrace_writedata(child, (char __user *) addr2,
 499                                            addr, data);
 500                 if (res == data) {
 501                         pt_succ_return(regs, 0);
 502                         goto flush_and_out;
 503                 }
 504                 if (res >= 0)
 505                         res = -EIO;
 506                 pt_error_return(regs, -res);
 507                 goto flush_and_out;
 508         }
 509         case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
 510                 addr = 1;
 511
 512         case PTRACE_CONT: { /* restart after signal. */
 513                 if (data > _NSIG) {
 514                         pt_error_return(regs, EIO);
 515                         goto out_tsk;
 516                 }
 517                 if (addr != 1) {
 518                         unsigned long pc_mask = ~0UL;
 519
 520                         if ((child->thread_info->flags & _TIF_32BIT) != 0)
 521                                 pc_mask = 0xffffffff;
 522
 523                         if (addr & 3) {
 524                                 pt_error_return(regs, EINVAL);
 525                                 goto out_tsk;
 526                         }
 527 #ifdef DEBUG_PTRACE
 528                         printk ("Original: %016lx %016lx\n",
 529                                 child->thread_info->kregs->tpc,
 530                                 child->thread_info->kregs->tnpc);
 531                         printk ("Continuing with %016lx %016lx\n", addr, addr+4);
 532 #endif
 533                         child->thread_info->kregs->tpc = (addr & pc_mask);
 534                         child->thread_info->kregs->tnpc = ((addr + 4) & pc_mask);
 535                 }
 536
 537                 if (request == PTRACE_SYSCALL) {
 538                         set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 539                 } else {
 540                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 541                 }
 542
 543                 child->exit_code = data;
 544 #ifdef DEBUG_PTRACE
 545                 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
 546                         child->pid, child->exit_code,
 547                         child->thread_info->kregs->tpc,
 548                         child->thread_info->kregs->tnpc);
 549
 550 #endif
 551                 wake_up_process(child);
 552                 pt_succ_return(regs, 0);
 553                 goto out_tsk;
 554         }
 555
 556 /*
 557  * make the child exit.  Best I can do is send it a sigkill.
 558  * perhaps it should be put in the status that it wants to
 559  * exit.
 560  */
 561         case PTRACE_KILL: {
 562                 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
 563                         pt_succ_return(regs, 0);
 564                         goto out_tsk;
 565                 }
 566                 child->exit_code = SIGKILL;
 567                 wake_up_process(child);
 568                 pt_succ_return(regs, 0);
 569                 goto out_tsk;
 570         }
 571
 572         case PTRACE_SUNDETACH: { /* detach a process that was attached. */
 573                 int error = ptrace_detach(child, data);
 574                 if (error) {
 575                         pt_error_return(regs, EIO);
 576                         goto out_tsk;
 577                 }
 578                 pt_succ_return(regs, 0);
 579                 goto out_tsk;
 580         }
 581
 582         /* PTRACE_DUMPCORE unsupported... */
 583
 584         default: {
 585                 int err = ptrace_request(child, request, addr, data);
 586                 if (err)
 587                         pt_error_return(regs, -err);
 588                 else
 589                         pt_succ_return(regs, 0);
 590                 goto out_tsk;
 591         }
 592         }
 593 flush_and_out:
 594         {
 595                 unsigned long va;
 596
 597                 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 598                         for (va = 0; va < (1 << 16); va += (1 << 5))
 599                                 spitfire_put_dcache_tag(va, 0x0);
 600                         /* No need to mess with I-cache on Cheetah. */
 601                 } else {
 602                         for (va =  0; va < L1DCACHE_SIZE; va += 32)
 603                                 spitfire_put_dcache_tag(va, 0x0);
 604                         if (request == PTRACE_PEEKTEXT ||
 605                             request == PTRACE_POKETEXT ||
 606                             request == PTRACE_READTEXT ||
 607                             request == PTRACE_WRITETEXT) {
 608                                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 609                                         spitfire_put_icache_tag(va, 0x0);
 610                                 __asm__ __volatile__("flush %g6");
 611                         }
 612                 }
 613         }
 614 out_tsk:
 615         if (child)
 616                 put_task_struct(child);
 617 out:
 618         unlock_kernel();
 619 }
 620
 621 asmlinkage void syscall_trace(void)
 622 {
 623 #ifdef DEBUG_PTRACE
 624         printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
 625 #endif
 626         if (!test_thread_flag(TIF_SYSCALL_TRACE))
 627                 return;
 628         if (!(current->ptrace & PT_PTRACED))
 629                 return;
 630         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 631                                  ? 0x80 : 0));
 632
 633         /*
 634          * this isn't the same as continuing with a signal, but it will do
 635          * for normal use.  strace only continues with a signal if the
 636          * stopping signal is not SIGTRAP.  -brl
 637          */
 638 #ifdef DEBUG_PTRACE
 639         printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
 640                 current->pid, current->exit_code);
 641 #endif
 642         if (current->exit_code) {
 643                 send_sig (current->exit_code, current, 1);
 644                 current->exit_code = 0;
 645         }
 646 }