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 (wierd, eh?, the orignal 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
  22 #include <asm/asi.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/system.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/psrcompat.h>
  27 #include <asm/visasm.h>
  28
  29 #define MAGIC_CONSTANT 0x80000000
  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, long *addr)
  54 {
  55         if (current->thread.flags & SPARC_FLAG_32BIT) {
  56                 if(put_user(value, (unsigned int *)addr))
  57                         return pt_error_return(regs, EFAULT);
  58         } else {
  59                 if(put_user(value, addr))
  60                         return pt_error_return(regs, EFAULT);
  61         }
  62         regs->u_regs[UREG_I0] = 0;
  63         regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
  64         regs->tpc = regs->tnpc;
  65         regs->tnpc += 4;
  66 }
  67
  68 static void
  69 pt_os_succ_return (struct pt_regs *regs, unsigned long val, long *addr)
  70 {
  71         if (current->personality & PER_BSD)
  72                 pt_succ_return (regs, val);
  73         else
  74                 pt_succ_return_linux (regs, val, addr);
  75 }
  76
  77 /* #define ALLOW_INIT_TRACING */
  78 /* #define DEBUG_PTRACE */
  79
  80 #ifdef DEBUG_PTRACE
  81 char *pt_rq [] = {
  82 "TRACEME",
  83 "PEEKTEXT",
  84 "PEEKDATA",
  85 "PEEKUSR",
  86 "POKETEXT",
  87 "POKEDATA",
  88 "POKEUSR",
  89 "CONT",
  90 "KILL",
  91 "SINGLESTEP",
  92 "SUNATTACH",
  93 "SUNDETACH",
  94 "GETREGS",
  95 "SETREGS",
  96 "GETFPREGS",
  97 "SETFPREGS",
  98 "READDATA",
  99 "WRITEDATA",
 100 "READTEXT",
 101 "WRITETEXT",
 102 "GETFPAREGS",
 103 "SETFPAREGS",
 104 ""
 105 };
 106 #endif
 107
 108 asmlinkage void do_ptrace(struct pt_regs *regs)
 109 {
 110         int request = regs->u_regs[UREG_I0];
 111         pid_t pid = regs->u_regs[UREG_I1];
 112         unsigned long addr = regs->u_regs[UREG_I2];
 113         unsigned long data = regs->u_regs[UREG_I3];
 114         unsigned long addr2 = regs->u_regs[UREG_I4];
 115         struct task_struct *child;
 116
 117         if (current->thread.flags & SPARC_FLAG_32BIT) {
 118                 addr &= 0xffffffffUL;
 119                 data &= 0xffffffffUL;
 120                 addr2 &= 0xffffffffUL;
 121         }
 122         lock_kernel();
 123 #ifdef DEBUG_PTRACE
 124         {
 125                 char *s;
 126
 127                 if ((request > 0) && (request < 21))
 128                         s = pt_rq [request];
 129                 else
 130                         s = "unknown";
 131
 132                 if (request == PTRACE_POKEDATA && data == 0x91d02001){
 133                         printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
 134                                 pid, addr, addr2);
 135                 } else
 136                         printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
 137                                s, request, pid, addr, data, addr2);
 138         }
 139 #endif
 140         if(request == PTRACE_TRACEME) {
 141                 /* are we already being traced? */
 142                 if (current->flags & PF_PTRACED) {
 143                         pt_error_return(regs, EPERM);
 144                         goto out;
 145                 }
 146                 /* set the ptrace bit in the process flags. */
 147                 current->flags |= PF_PTRACED;
 148                 pt_succ_return(regs, 0);
 149                 goto out;
 150         }
 151 #ifndef ALLOW_INIT_TRACING
 152         if(pid == 1) {
 153                 /* Can't dork with init. */
 154                 pt_error_return(regs, EPERM);
 155                 goto out;
 156         }
 157 #endif
 158         read_lock(&tasklist_lock);
 159         child = find_task_by_pid(pid);
 160         read_unlock(&tasklist_lock);
 161
 162         if(!child) {
 163                 pt_error_return(regs, ESRCH);
 164                 goto out;
 165         }
 166
 167         if (((current->personality & PER_BSD) && (request == PTRACE_SUNATTACH))
 168             || (!(current->personality & PER_BSD) && (request == PTRACE_ATTACH))) {
 169                 unsigned long flags;
 170
 171                 if(child == current) {
 172                         /* Try this under SunOS/Solaris, bwa haha
 173                          * You'll never be able to kill the process. ;-)
 174                          */
 175                         pt_error_return(regs, EPERM);
 176                         goto out;
 177                 }
 178                 if((!child->dumpable ||
 179                     (current->uid != child->euid) ||
 180                     (current->uid != child->uid) ||
 181                     (current->uid != child->suid) ||
 182                     (current->gid != child->egid) ||
 183                     (current->gid != child->sgid) ||
 184                     (!cap_issubset(child->cap_permitted, current->cap_permitted)) ||
 185                     (current->gid != child->gid)) && !capable(CAP_SYS_PTRACE)) {
 186                         pt_error_return(regs, EPERM);
 187                         goto out;
 188                 }
 189                 /* the same process cannot be attached many times */
 190                 if (child->flags & PF_PTRACED) {
 191                         pt_error_return(regs, EPERM);
 192                         goto out;
 193                 }
 194                 child->flags |= PF_PTRACED;
 195                 write_lock_irqsave(&tasklist_lock, flags);
 196                 if(child->p_pptr != current) {
 197                         REMOVE_LINKS(child);
 198                         child->p_pptr = current;
 199                         SET_LINKS(child);
 200                 }
 201                 write_unlock_irqrestore(&tasklist_lock, flags);
 202                 send_sig(SIGSTOP, child, 1);
 203                 pt_succ_return(regs, 0);
 204                 goto out;
 205         }
 206         if (!(child->flags & PF_PTRACED)
 207             && ((current->personality & PER_BSD) && (request != PTRACE_SUNATTACH))
 208             && (!(current->personality & PER_BSD) && (request != PTRACE_ATTACH))) {
 209                 pt_error_return(regs, ESRCH);
 210                 goto out;
 211         }
 212         if(child->state != TASK_STOPPED) {
 213                 if(request != PTRACE_KILL) {
 214                         pt_error_return(regs, ESRCH);
 215                         goto out;
 216                 }
 217         }
 218         if(child->p_pptr != current) {
 219                 pt_error_return(regs, ESRCH);
 220                 goto out;
 221         }
 222
 223         if(!(child->thread.flags & SPARC_FLAG_32BIT)    &&
 224            ((request == PTRACE_READDATA64)              ||
 225             (request == PTRACE_WRITEDATA64)             ||
 226             (request == PTRACE_READTEXT64)              ||
 227             (request == PTRACE_WRITETEXT64)             ||
 228             (request == PTRACE_PEEKTEXT64)              ||
 229             (request == PTRACE_POKETEXT64)              ||
 230             (request == PTRACE_PEEKDATA64)              ||
 231             (request == PTRACE_POKEDATA64))) {
 232                 addr = regs->u_regs[UREG_G2];
 233                 addr2 = regs->u_regs[UREG_G3];
 234                 request -= 30; /* wheee... */
 235         }
 236
 237         switch(request) {
 238         case PTRACE_PEEKTEXT: /* read word at location addr. */
 239         case PTRACE_PEEKDATA: {
 240                 unsigned long tmp64;
 241                 unsigned int tmp32;
 242                 int res, copied;
 243
 244                 res = -EIO;
 245                 if (current->thread.flags & SPARC_FLAG_32BIT) {
 246                         copied = access_process_vm(child, addr,
 247                                                    &tmp32, sizeof(tmp32), 0);
 248                         tmp64 = (unsigned long) tmp32;
 249                         if (copied == sizeof(tmp32))
 250                                 res = 0;
 251                 } else {
 252                         copied = access_process_vm(child, addr,
 253                                                    &tmp64, sizeof(tmp64), 0);
 254                         if (copied == sizeof(tmp64))
 255                                 res = 0;
 256                 }
 257                 if (res < 0)
 258                         pt_error_return(regs, -res);
 259                 else
 260                         pt_os_succ_return(regs, tmp64, (long *) data);
 261                 goto flush_and_out;
 262         }
 263
 264         case PTRACE_POKETEXT: /* write the word at location addr. */
 265         case PTRACE_POKEDATA: {
 266                 unsigned long tmp64;
 267                 unsigned int tmp32;
 268                 int copied, res = -EIO;
 269
 270                 if (current->thread.flags & SPARC_FLAG_32BIT) {
 271                         tmp32 = data;
 272                         copied = access_process_vm(child, addr,
 273                                                    &tmp32, sizeof(tmp32), 1);
 274                         if (copied == sizeof(tmp32))
 275                                 res = 0;
 276                 } else {
 277                         tmp64 = data;
 278                         copied = access_process_vm(child, addr,
 279                                                    &tmp64, sizeof(tmp64), 1);
 280                         if (copied == sizeof(tmp64))
 281                                 res = 0;
 282                 }
 283                 if(res < 0)
 284                         pt_error_return(regs, -res);
 285                 else
 286                         pt_succ_return(regs, res);
 287                 goto flush_and_out;
 288         }
 289
 290         case PTRACE_GETREGS: {
 291                 struct pt_regs32 *pregs = (struct pt_regs32 *) addr;
 292                 struct pt_regs *cregs = child->thread.kregs;
 293                 int rval;
 294
 295                 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
 296                     __put_user(cregs->tpc, (&pregs->pc)) ||
 297                     __put_user(cregs->tnpc, (&pregs->npc)) ||
 298                     __put_user(cregs->y, (&pregs->y))) {
 299                         pt_error_return(regs, EFAULT);
 300                         goto out;
 301                 }
 302                 for(rval = 1; rval < 16; rval++)
 303                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 304                                 pt_error_return(regs, EFAULT);
 305                                 goto out;
 306                         }
 307                 pt_succ_return(regs, 0);
 308 #ifdef DEBUG_PTRACE
 309                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 310 #endif
 311                 goto out;
 312         }
 313
 314         case PTRACE_GETREGS64: {
 315                 struct pt_regs *pregs = (struct pt_regs *) addr;
 316                 struct pt_regs *cregs = child->thread.kregs;
 317                 int rval;
 318
 319                 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
 320                     __put_user(cregs->tpc, (&pregs->tpc)) ||
 321                     __put_user(cregs->tnpc, (&pregs->tnpc)) ||
 322                     __put_user(cregs->y, (&pregs->y))) {
 323                         pt_error_return(regs, EFAULT);
 324                         goto out;
 325                 }
 326                 for(rval = 1; rval < 16; rval++)
 327                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 328                                 pt_error_return(regs, EFAULT);
 329                                 goto out;
 330                         }
 331                 pt_succ_return(regs, 0);
 332 #ifdef DEBUG_PTRACE
 333                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 334 #endif
 335                 goto out;
 336         }
 337
 338         case PTRACE_SETREGS: {
 339                 struct pt_regs32 *pregs = (struct pt_regs32 *) addr;
 340                 struct pt_regs *cregs = child->thread.kregs;
 341                 unsigned int psr, pc, npc, y;
 342                 int i;
 343
 344                 /* Must be careful, tracing process can only set certain
 345                  * bits in the psr.
 346                  */
 347                 if (__get_user(psr, (&pregs->psr)) ||
 348                     __get_user(pc, (&pregs->pc)) ||
 349                     __get_user(npc, (&pregs->npc)) ||
 350                     __get_user(y, (&pregs->y))) {
 351                         pt_error_return(regs, EFAULT);
 352                         goto out;
 353                 }
 354                 cregs->tstate &= ~(TSTATE_ICC);
 355                 cregs->tstate |= psr_to_tstate_icc(psr);
 356                 if(!((pc | npc) & 3)) {
 357                         cregs->tpc = pc;
 358                         cregs->tnpc = npc;
 359                 }
 360                 cregs->y = y;
 361                 for(i = 1; i < 16; i++) {
 362                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 363                                 pt_error_return(regs, EFAULT);
 364                                 goto out;
 365                         }
 366                 }
 367                 pt_succ_return(regs, 0);
 368                 goto out;
 369         }
 370
 371         case PTRACE_SETREGS64: {
 372                 struct pt_regs *pregs = (struct pt_regs *) addr;
 373                 struct pt_regs *cregs = child->thread.kregs;
 374                 unsigned long tstate, tpc, tnpc, y;
 375                 int i;
 376
 377                 /* Must be careful, tracing process can only set certain
 378                  * bits in the psr.
 379                  */
 380                 if (__get_user(tstate, (&pregs->tstate)) ||
 381                     __get_user(tpc, (&pregs->tpc)) ||
 382                     __get_user(tnpc, (&pregs->tnpc)) ||
 383                     __get_user(y, (&pregs->y))) {
 384                         pt_error_return(regs, EFAULT);
 385                         goto out;
 386                 }
 387                 tstate &= (TSTATE_ICC | TSTATE_XCC);
 388                 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 389                 cregs->tstate |= tstate;
 390                 if(!((tpc | tnpc) & 3)) {
 391                         cregs->tpc = tpc;
 392                         cregs->tnpc = tnpc;
 393                 }
 394                 cregs->y = y;
 395                 for(i = 1; i < 16; i++) {
 396                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 397                                 pt_error_return(regs, EFAULT);
 398                                 goto out;
 399                         }
 400                 }
 401                 pt_succ_return(regs, 0);
 402                 goto out;
 403         }
 404
 405         case PTRACE_GETFPREGS: {
 406                 struct fps {
 407                         unsigned int regs[32];
 408                         unsigned int fsr;
 409                         unsigned int flags;
 410                         unsigned int extra;
 411                         unsigned int fpqd;
 412                         struct fq {
 413                                 unsigned int insnaddr;
 414                                 unsigned int insn;
 415                         } fpq[16];
 416                 } *fps = (struct fps *) addr;
 417                 unsigned long *fpregs = (unsigned long *)(((char *)child) + AOFF_task_fpregs);
 418
 419                 if (copy_to_user(&fps->regs[0], fpregs,
 420                                  (32 * sizeof(unsigned int))) ||
 421                     __put_user(child->thread.xfsr[0], (&fps->fsr)) ||
 422                     __put_user(0, (&fps->fpqd)) ||
 423                     __put_user(0, (&fps->flags)) ||
 424                     __put_user(0, (&fps->extra)) ||
 425                     clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
 426                         pt_error_return(regs, EFAULT);
 427                         goto out;
 428                 }
 429                 pt_succ_return(regs, 0);
 430                 goto out;
 431         }
 432
 433         case PTRACE_GETFPREGS64: {
 434                 struct fps {
 435                         unsigned int regs[64];
 436                         unsigned long fsr;
 437                 } *fps = (struct fps *) addr;
 438                 unsigned long *fpregs = (unsigned long *)(((char *)child) + AOFF_task_fpregs);
 439
 440                 if (copy_to_user(&fps->regs[0], fpregs,
 441                                  (64 * sizeof(unsigned int))) ||
 442                     __put_user(child->thread.xfsr[0], (&fps->fsr))) {
 443                         pt_error_return(regs, EFAULT);
 444                         goto out;
 445                 }
 446                 pt_succ_return(regs, 0);
 447                 goto out;
 448         }
 449
 450         case PTRACE_SETFPREGS: {
 451                 struct fps {
 452                         unsigned int regs[32];
 453                         unsigned int fsr;
 454                         unsigned int flags;
 455                         unsigned int extra;
 456                         unsigned int fpqd;
 457                         struct fq {
 458                                 unsigned int insnaddr;
 459                                 unsigned int insn;
 460                         } fpq[16];
 461                 } *fps = (struct fps *) addr;
 462                 unsigned long *fpregs = (unsigned long *)(((char *)child) + AOFF_task_fpregs);
 463                 unsigned fsr;
 464
 465                 if (copy_from_user(fpregs, &fps->regs[0],
 466                                    (32 * sizeof(unsigned int))) ||
 467                     __get_user(fsr, (&fps->fsr))) {
 468                         pt_error_return(regs, EFAULT);
 469                         goto out;
 470                 }
 471                 child->thread.xfsr[0] &= 0xffffffff00000000UL;
 472                 child->thread.xfsr[0] |= fsr;
 473                 if (!(child->thread.fpsaved[0] & FPRS_FEF))
 474                         child->thread.gsr[0] = 0;
 475                 child->thread.fpsaved[0] |= (FPRS_FEF | FPRS_DL);
 476                 pt_succ_return(regs, 0);
 477                 goto out;
 478         }
 479
 480         case PTRACE_SETFPREGS64: {
 481                 struct fps {
 482                         unsigned int regs[64];
 483                         unsigned long fsr;
 484                 } *fps = (struct fps *) addr;
 485                 unsigned long *fpregs = (unsigned long *)(((char *)child) + AOFF_task_fpregs);
 486
 487                 if (copy_from_user(fpregs, &fps->regs[0],
 488                                    (64 * sizeof(unsigned int))) ||
 489                     __get_user(child->thread.xfsr[0], (&fps->fsr))) {
 490                         pt_error_return(regs, EFAULT);
 491                         goto out;
 492                 }
 493                 if (!(child->thread.fpsaved[0] & FPRS_FEF))
 494                         child->thread.gsr[0] = 0;
 495                 child->thread.fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 496                 pt_succ_return(regs, 0);
 497                 goto out;
 498         }
 499
 500         case PTRACE_READTEXT:
 501         case PTRACE_READDATA: {
 502                 int res = ptrace_readdata(child, addr,
 503                                           (void *)addr2, data);
 504                 if (res == data) {
 505                         pt_succ_return(regs, 0);
 506                         goto flush_and_out;
 507                 }
 508                 if (res >= 0)
 509                         res = -EIO;
 510                 pt_error_return(regs, -res);
 511                 goto flush_and_out;
 512         }
 513
 514         case PTRACE_WRITETEXT:
 515         case PTRACE_WRITEDATA: {
 516                 int res = ptrace_writedata(child, (void *) addr2,
 517                                            addr, data);
 518                 if (res == data) {
 519                         pt_succ_return(regs, 0);
 520                         goto flush_and_out;
 521                 }
 522                 if (res >= 0)
 523                         res = -EIO;
 524                 pt_error_return(regs, -res);
 525                 goto flush_and_out;
 526         }
 527         case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
 528                 addr = 1;
 529
 530         case PTRACE_CONT: { /* restart after signal. */
 531                 if (data > _NSIG) {
 532                         pt_error_return(regs, EIO);
 533                         goto out;
 534                 }
 535                 if (addr != 1) {
 536                         if (addr & 3) {
 537                                 pt_error_return(regs, EINVAL);
 538                                 goto out;
 539                         }
 540 #ifdef DEBUG_PTRACE
 541                         printk ("Original: %016lx %016lx\n", child->thread.kregs->tpc, child->thread.kregs->tnpc);
 542                         printk ("Continuing with %016lx %016lx\n", addr, addr+4);
 543 #endif
 544                         child->thread.kregs->tpc = addr;
 545                         child->thread.kregs->tnpc = addr + 4;
 546                 }
 547
 548                 if (request == PTRACE_SYSCALL)
 549                         child->flags |= PF_TRACESYS;
 550                 else
 551                         child->flags &= ~PF_TRACESYS;
 552
 553                 child->exit_code = data;
 554 #ifdef DEBUG_PTRACE
 555                 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
 556                         child->pid, child->exit_code,
 557                         child->thread.kregs->tpc,
 558                         child->thread.kregs->tnpc);
 559
 560 #endif
 561                 wake_up_process(child);
 562                 pt_succ_return(regs, 0);
 563                 goto out;
 564         }
 565
 566 /*
 567  * make the child exit.  Best I can do is send it a sigkill.
 568  * perhaps it should be put in the status that it wants to
 569  * exit.
 570  */
 571         case PTRACE_KILL: {
 572                 if (child->state == TASK_ZOMBIE) {      /* already dead */
 573                         pt_succ_return(regs, 0);
 574                         goto out;
 575                 }
 576                 child->exit_code = SIGKILL;
 577                 wake_up_process(child);
 578                 pt_succ_return(regs, 0);
 579                 goto out;
 580         }
 581
 582         case PTRACE_SUNDETACH: { /* detach a process that was attached. */
 583                 unsigned long flags;
 584
 585                 if ((unsigned long) data > _NSIG) {
 586                         pt_error_return(regs, EIO);
 587                         goto out;
 588                 }
 589                 child->flags &= ~(PF_PTRACED|PF_TRACESYS);
 590                 child->exit_code = data;
 591
 592                 write_lock_irqsave(&tasklist_lock, flags);
 593                 REMOVE_LINKS(child);
 594                 child->p_pptr = child->p_opptr;
 595                 SET_LINKS(child);
 596                 write_unlock_irqrestore(&tasklist_lock, flags);
 597
 598                 wake_up_process(child);
 599                 pt_succ_return(regs, 0);
 600                 goto out;
 601         }
 602
 603         /* PTRACE_DUMPCORE unsupported... */
 604
 605         default:
 606                 pt_error_return(regs, EIO);
 607                 goto out;
 608         }
 609 flush_and_out:
 610         {
 611                 unsigned long va;
 612                 for(va =  0; va < (PAGE_SIZE << 1); va += 32)
 613                         spitfire_put_dcache_tag(va, 0x0);
 614                 if (request == PTRACE_PEEKTEXT ||
 615                     request == PTRACE_POKETEXT ||
 616                     request == PTRACE_READTEXT ||
 617                     request == PTRACE_WRITETEXT) {
 618                         for(va =  0; va < (PAGE_SIZE << 1); va += 32)
 619                                 spitfire_put_icache_tag(va, 0x0);
 620                         __asm__ __volatile__("flush %g6");
 621                 }
 622         }
 623 out:
 624         unlock_kernel();
 625 }
 626
 627 asmlinkage void syscall_trace(void)
 628 {
 629 #ifdef DEBUG_PTRACE
 630         printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
 631 #endif
 632         if ((current->flags & (PF_PTRACED|PF_TRACESYS))
 633                         != (PF_PTRACED|PF_TRACESYS))
 634                 return;
 635         current->exit_code = SIGTRAP;
 636         current->state = TASK_STOPPED;
 637         current->thread.flags ^= MAGIC_CONSTANT;
 638         notify_parent(current, SIGCHLD);
 639         schedule();
 640         /*
 641          * this isn't the same as continuing with a signal, but it will do
 642          * for normal use.  strace only continues with a signal if the
 643          * stopping signal is not SIGTRAP.  -brl
 644          */
 645 #ifdef DEBUG_PTRACE
 646         printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
 647                 current->pid, current->exit_code);
 648 #endif
 649         if (current->exit_code) {
 650                 send_sig (current->exit_code, current, 1);
 651                 current->exit_code = 0;
 652         }
 653 }