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 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_SUNOS)
  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->ptrace & PT_PTRACED) {
 143                         pt_error_return(regs, EPERM);
 144                         goto out;
 145                 }
 146                 /* set the ptrace bit in the process flags. */
 147                 current->ptrace |= PT_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         if (child)
 161                 get_task_struct(child);
 162         read_unlock(&tasklist_lock);
 163
 164         if (!child) {
 165                 pt_error_return(regs, ESRCH);
 166                 goto out;
 167         }
 168
 169         if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
 170             || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
 171                 unsigned long flags;
 172
 173                 if (child == current) {
 174                         /* Try this under SunOS/Solaris, bwa haha
 175                          * You'll never be able to kill the process. ;-)
 176                          */
 177                         pt_error_return(regs, EPERM);
 178                         goto out_tsk;
 179                 }
 180                 if ((!child->dumpable ||
 181                      (current->uid != child->euid) ||
 182                      (current->uid != child->uid) ||
 183                      (current->uid != child->suid) ||
 184                      (current->gid != child->egid) ||
 185                      (current->gid != child->sgid) ||
 186                      (!cap_issubset(child->cap_permitted, current->cap_permitted)) ||
 187                      (current->gid != child->gid)) && !capable(CAP_SYS_PTRACE)) {
 188                         pt_error_return(regs, EPERM);
 189                         goto out_tsk;
 190                 }
 191                 /* the same process cannot be attached many times */
 192                 if (child->ptrace & PT_PTRACED) {
 193                         pt_error_return(regs, EPERM);
 194                         goto out_tsk;
 195                 }
 196                 child->ptrace |= PT_PTRACED;
 197                 write_lock_irqsave(&tasklist_lock, flags);
 198                 if (child->p_pptr != current) {
 199                         REMOVE_LINKS(child);
 200                         child->p_pptr = current;
 201                         SET_LINKS(child);
 202                 }
 203                 write_unlock_irqrestore(&tasklist_lock, flags);
 204                 send_sig(SIGSTOP, child, 1);
 205                 pt_succ_return(regs, 0);
 206                 goto out_tsk;
 207         }
 208         if (!(child->ptrace & PT_PTRACED)) {
 209                 pt_error_return(regs, ESRCH);
 210                 goto out_tsk;
 211         }
 212         if (child->state != TASK_STOPPED) {
 213                 if (request != PTRACE_KILL) {
 214                         pt_error_return(regs, ESRCH);
 215                         goto out_tsk;
 216                 }
 217         }
 218         if (child->p_pptr != current) {
 219                 pt_error_return(regs, ESRCH);
 220                 goto out_tsk;
 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_tsk;
 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_tsk;
 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_tsk;
 312         }
 313
 314         case PTRACE_GETREGS64: {
 315                 struct pt_regs *pregs = (struct pt_regs *) addr;
 316                 struct pt_regs *cregs = child->thread.kregs;
 317                 unsigned long tpc = cregs->tpc;
 318                 int rval;
 319
 320                 if ((child->thread.flags & SPARC_FLAG_32BIT) != 0)
 321                         tpc &= 0xffffffff;
 322                 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
 323                     __put_user(tpc, (&pregs->tpc)) ||
 324                     __put_user(cregs->tnpc, (&pregs->tnpc)) ||
 325                     __put_user(cregs->y, (&pregs->y))) {
 326                         pt_error_return(regs, EFAULT);
 327                         goto out_tsk;
 328                 }
 329                 for (rval = 1; rval < 16; rval++)
 330                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 331                                 pt_error_return(regs, EFAULT);
 332                                 goto out_tsk;
 333                         }
 334                 pt_succ_return(regs, 0);
 335 #ifdef DEBUG_PTRACE
 336                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 337 #endif
 338                 goto out_tsk;
 339         }
 340
 341         case PTRACE_SETREGS: {
 342                 struct pt_regs32 *pregs = (struct pt_regs32 *) addr;
 343                 struct pt_regs *cregs = child->thread.kregs;
 344                 unsigned int psr, pc, npc, y;
 345                 int i;
 346
 347                 /* Must be careful, tracing process can only set certain
 348                  * bits in the psr.
 349                  */
 350                 if (__get_user(psr, (&pregs->psr)) ||
 351                     __get_user(pc, (&pregs->pc)) ||
 352                     __get_user(npc, (&pregs->npc)) ||
 353                     __get_user(y, (&pregs->y))) {
 354                         pt_error_return(regs, EFAULT);
 355                         goto out_tsk;
 356                 }
 357                 cregs->tstate &= ~(TSTATE_ICC);
 358                 cregs->tstate |= psr_to_tstate_icc(psr);
 359                 if (!((pc | npc) & 3)) {
 360                         cregs->tpc = pc;
 361                         cregs->tnpc = npc;
 362                 }
 363                 cregs->y = y;
 364                 for (i = 1; i < 16; i++) {
 365                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 366                                 pt_error_return(regs, EFAULT);
 367                                 goto out_tsk;
 368                         }
 369                 }
 370                 pt_succ_return(regs, 0);
 371                 goto out_tsk;
 372         }
 373
 374         case PTRACE_SETREGS64: {
 375                 struct pt_regs *pregs = (struct pt_regs *) addr;
 376                 struct pt_regs *cregs = child->thread.kregs;
 377                 unsigned long tstate, tpc, tnpc, y;
 378                 int i;
 379
 380                 /* Must be careful, tracing process can only set certain
 381                  * bits in the psr.
 382                  */
 383                 if (__get_user(tstate, (&pregs->tstate)) ||
 384                     __get_user(tpc, (&pregs->tpc)) ||
 385                     __get_user(tnpc, (&pregs->tnpc)) ||
 386                     __get_user(y, (&pregs->y))) {
 387                         pt_error_return(regs, EFAULT);
 388                         goto out_tsk;
 389                 }
 390                 if ((child->thread.flags & SPARC_FLAG_32BIT) != 0) {
 391                         tpc &= 0xffffffff;
 392                         tnpc &= 0xffffffff;
 393                 }
 394                 tstate &= (TSTATE_ICC | TSTATE_XCC);
 395                 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 396                 cregs->tstate |= tstate;
 397                 if (!((tpc | tnpc) & 3)) {
 398                         cregs->tpc = tpc;
 399                         cregs->tnpc = tnpc;
 400                 }
 401                 cregs->y = y;
 402                 for (i = 1; i < 16; i++) {
 403                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 404                                 pt_error_return(regs, EFAULT);
 405                                 goto out_tsk;
 406                         }
 407                 }
 408                 pt_succ_return(regs, 0);
 409                 goto out_tsk;
 410         }
 411
 412         case PTRACE_GETFPREGS: {
 413                 struct fps {
 414                         unsigned int regs[32];
 415                         unsigned int fsr;
 416                         unsigned int flags;
 417                         unsigned int extra;
 418                         unsigned int fpqd;
 419                         struct fq {
 420                                 unsigned int insnaddr;
 421                                 unsigned int insn;
 422                         } fpq[16];
 423                 } *fps = (struct fps *) addr;
 424                 unsigned long *fpregs = (unsigned long *)(((char *)child) + AOFF_task_fpregs);
 425
 426                 if (copy_to_user(&fps->regs[0], fpregs,
 427                                  (32 * sizeof(unsigned int))) ||
 428                     __put_user(child->thread.xfsr[0], (&fps->fsr)) ||
 429                     __put_user(0, (&fps->fpqd)) ||
 430                     __put_user(0, (&fps->flags)) ||
 431                     __put_user(0, (&fps->extra)) ||
 432                     clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
 433                         pt_error_return(regs, EFAULT);
 434                         goto out_tsk;
 435                 }
 436                 pt_succ_return(regs, 0);
 437                 goto out_tsk;
 438         }
 439
 440         case PTRACE_GETFPREGS64: {
 441                 struct fps {
 442                         unsigned int regs[64];
 443                         unsigned long fsr;
 444                 } *fps = (struct fps *) addr;
 445                 unsigned long *fpregs = (unsigned long *)(((char *)child) + AOFF_task_fpregs);
 446
 447                 if (copy_to_user(&fps->regs[0], fpregs,
 448                                  (64 * sizeof(unsigned int))) ||
 449                     __put_user(child->thread.xfsr[0], (&fps->fsr))) {
 450                         pt_error_return(regs, EFAULT);
 451                         goto out_tsk;
 452                 }
 453                 pt_succ_return(regs, 0);
 454                 goto out_tsk;
 455         }
 456
 457         case PTRACE_SETFPREGS: {
 458                 struct fps {
 459                         unsigned int regs[32];
 460                         unsigned int fsr;
 461                         unsigned int flags;
 462                         unsigned int extra;
 463                         unsigned int fpqd;
 464                         struct fq {
 465                                 unsigned int insnaddr;
 466                                 unsigned int insn;
 467                         } fpq[16];
 468                 } *fps = (struct fps *) addr;
 469                 unsigned long *fpregs = (unsigned long *)(((char *)child) + AOFF_task_fpregs);
 470                 unsigned fsr;
 471
 472                 if (copy_from_user(fpregs, &fps->regs[0],
 473                                    (32 * sizeof(unsigned int))) ||
 474                     __get_user(fsr, (&fps->fsr))) {
 475                         pt_error_return(regs, EFAULT);
 476                         goto out_tsk;
 477                 }
 478                 child->thread.xfsr[0] &= 0xffffffff00000000UL;
 479                 child->thread.xfsr[0] |= fsr;
 480                 if (!(child->thread.fpsaved[0] & FPRS_FEF))
 481                         child->thread.gsr[0] = 0;
 482                 child->thread.fpsaved[0] |= (FPRS_FEF | FPRS_DL);
 483                 pt_succ_return(regs, 0);
 484                 goto out_tsk;
 485         }
 486
 487         case PTRACE_SETFPREGS64: {
 488                 struct fps {
 489                         unsigned int regs[64];
 490                         unsigned long fsr;
 491                 } *fps = (struct fps *) addr;
 492                 unsigned long *fpregs = (unsigned long *)(((char *)child) + AOFF_task_fpregs);
 493
 494                 if (copy_from_user(fpregs, &fps->regs[0],
 495                                    (64 * sizeof(unsigned int))) ||
 496                     __get_user(child->thread.xfsr[0], (&fps->fsr))) {
 497                         pt_error_return(regs, EFAULT);
 498                         goto out_tsk;
 499                 }
 500                 if (!(child->thread.fpsaved[0] & FPRS_FEF))
 501                         child->thread.gsr[0] = 0;
 502                 child->thread.fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 503                 pt_succ_return(regs, 0);
 504                 goto out_tsk;
 505         }
 506
 507         case PTRACE_READTEXT:
 508         case PTRACE_READDATA: {
 509                 int res = ptrace_readdata(child, addr,
 510                                           (void *)addr2, data);
 511                 if (res == data) {
 512                         pt_succ_return(regs, 0);
 513                         goto flush_and_out;
 514                 }
 515                 if (res >= 0)
 516                         res = -EIO;
 517                 pt_error_return(regs, -res);
 518                 goto flush_and_out;
 519         }
 520
 521         case PTRACE_WRITETEXT:
 522         case PTRACE_WRITEDATA: {
 523                 int res = ptrace_writedata(child, (void *) addr2,
 524                                            addr, data);
 525                 if (res == data) {
 526                         pt_succ_return(regs, 0);
 527                         goto flush_and_out;
 528                 }
 529                 if (res >= 0)
 530                         res = -EIO;
 531                 pt_error_return(regs, -res);
 532                 goto flush_and_out;
 533         }
 534         case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
 535                 addr = 1;
 536
 537         case PTRACE_CONT: { /* restart after signal. */
 538                 if (data > _NSIG) {
 539                         pt_error_return(regs, EIO);
 540                         goto out_tsk;
 541                 }
 542                 if (addr != 1) {
 543                         unsigned long pc_mask = ~0UL;
 544
 545                         if ((child->thread.flags & SPARC_FLAG_32BIT) != 0)
 546                                 pc_mask = 0xffffffff;
 547
 548                         if (addr & 3) {
 549                                 pt_error_return(regs, EINVAL);
 550                                 goto out_tsk;
 551                         }
 552 #ifdef DEBUG_PTRACE
 553                         printk ("Original: %016lx %016lx\n", child->thread.kregs->tpc, child->thread.kregs->tnpc);
 554                         printk ("Continuing with %016lx %016lx\n", addr, addr+4);
 555 #endif
 556                         child->thread.kregs->tpc = (addr & pc_mask);
 557                         child->thread.kregs->tnpc = ((addr + 4) & pc_mask);
 558                 }
 559
 560                 if (request == PTRACE_SYSCALL)
 561                         child->ptrace |= PT_TRACESYS;
 562                 else
 563                         child->ptrace &= ~PT_TRACESYS;
 564
 565                 child->exit_code = data;
 566 #ifdef DEBUG_PTRACE
 567                 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
 568                         child->pid, child->exit_code,
 569                         child->thread.kregs->tpc,
 570                         child->thread.kregs->tnpc);
 571
 572 #endif
 573                 wake_up_process(child);
 574                 pt_succ_return(regs, 0);
 575                 goto out_tsk;
 576         }
 577
 578 /*
 579  * make the child exit.  Best I can do is send it a sigkill.
 580  * perhaps it should be put in the status that it wants to
 581  * exit.
 582  */
 583         case PTRACE_KILL: {
 584                 if (child->state == TASK_ZOMBIE) {      /* already dead */
 585                         pt_succ_return(regs, 0);
 586                         goto out_tsk;
 587                 }
 588                 child->exit_code = SIGKILL;
 589                 wake_up_process(child);
 590                 pt_succ_return(regs, 0);
 591                 goto out_tsk;
 592         }
 593
 594         case PTRACE_SUNDETACH: { /* detach a process that was attached. */
 595                 unsigned long flags;
 596
 597                 if ((unsigned long) data > _NSIG) {
 598                         pt_error_return(regs, EIO);
 599                         goto out_tsk;
 600                 }
 601                 child->ptrace &= ~(PT_PTRACED|PT_TRACESYS);
 602                 child->exit_code = data;
 603
 604                 write_lock_irqsave(&tasklist_lock, flags);
 605                 REMOVE_LINKS(child);
 606                 child->p_pptr = child->p_opptr;
 607                 SET_LINKS(child);
 608                 write_unlock_irqrestore(&tasklist_lock, flags);
 609
 610                 wake_up_process(child);
 611                 pt_succ_return(regs, 0);
 612                 goto out_tsk;
 613         }
 614
 615         /* PTRACE_DUMPCORE unsupported... */
 616
 617         default:
 618                 pt_error_return(regs, EIO);
 619                 goto out_tsk;
 620         }
 621 flush_and_out:
 622         {
 623                 unsigned long va;
 624
 625                 if (tlb_type == cheetah) {
 626                         for (va = 0; va < (1 << 16); va += (1 << 5))
 627                                 spitfire_put_dcache_tag(va, 0x0);
 628                         /* No need to mess with I-cache on Cheetah. */
 629                 } else {
 630                         for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 631                                 spitfire_put_dcache_tag(va, 0x0);
 632                         if (request == PTRACE_PEEKTEXT ||
 633                             request == PTRACE_POKETEXT ||
 634                             request == PTRACE_READTEXT ||
 635                             request == PTRACE_WRITETEXT) {
 636                                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 637                                         spitfire_put_icache_tag(va, 0x0);
 638                                 __asm__ __volatile__("flush %g6");
 639                         }
 640                 }
 641         }
 642 out_tsk:
 643         if (child)
 644                 free_task_struct(child);
 645 out:
 646         unlock_kernel();
 647 }
 648
 649 asmlinkage void syscall_trace(void)
 650 {
 651 #ifdef DEBUG_PTRACE
 652         printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
 653 #endif
 654         if ((current->ptrace & (PT_PTRACED|PT_TRACESYS))
 655             != (PT_PTRACED|PT_TRACESYS))
 656                 return;
 657         current->exit_code = SIGTRAP;
 658         current->state = TASK_STOPPED;
 659         current->thread.flags ^= MAGIC_CONSTANT;
 660         notify_parent(current, SIGCHLD);
 661         schedule();
 662         /*
 663          * this isn't the same as continuing with a signal, but it will do
 664          * for normal use.  strace only continues with a signal if the
 665          * stopping signal is not SIGTRAP.  -brl
 666          */
 667 #ifdef DEBUG_PTRACE
 668         printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
 669                 current->pid, current->exit_code);
 670 #endif
 671         if (current->exit_code) {
 672                 send_sig (current->exit_code, current, 1);
 673                 current->exit_code = 0;
 674         }
 675 }