server/context_i386.c

   1 /*
   2  * i386 register context support
   3  *
   4  * Copyright (C) 1999 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22
  23 #ifdef __i386__
  24
  25 #include <assert.h>
  26 #include <errno.h>
  27 #ifdef HAVE_SYS_REG_H
  28 #include <sys/reg.h>
  29 #endif
  30 #include <stdarg.h>
  31 #include <unistd.h>
  32 #ifdef HAVE_SYS_PTRACE_H
  33 # include <sys/ptrace.h>
  34 #endif
  35 #ifdef HAVE_SYS_PARAM_H
  36 # include <sys/param.h>
  37 #endif
  38
  39 #include "windef.h"
  40
  41 #include "file.h"
  42 #include "thread.h"
  43 #include "request.h"
  44
  45 #ifndef PTRACE_PEEKUSER
  46 #  ifdef PTRACE_PEEKUSR /* libc5 uses USR not USER */
  47 #    define PTRACE_PEEKUSER PTRACE_PEEKUSR
  48 #  else
  49 #    define PTRACE_PEEKUSER PT_READ_U
  50 #  endif
  51 #endif
  52
  53 #ifndef PTRACE_POKEUSER
  54 #  ifdef PTRACE_POKEUSR /* libc5 uses USR not USER */
  55 #    define PTRACE_POKEUSER PTRACE_POKEUSR
  56 #  else
  57 #    define PTRACE_POKEUSER PT_WRITE_U
  58 #  endif
  59 #endif
  60
  61 #ifndef PTRACE_GETREGS
  62 #define PTRACE_GETREGS PT_GETREGS
  63 #endif
  64 #ifndef PTRACE_GETFPREGS
  65 #define PTRACE_GETFPREGS PT_GETFPREGS
  66 #endif
  67 #ifndef PTRACE_SETREGS
  68 #define PTRACE_SETREGS PT_SETREGS
  69 #endif
  70 #ifndef PTRACE_SETFPREGS
  71 #define PTRACE_SETFPREGS PT_SETFPREGS
  72 #endif
  73
  74 #ifdef PT_GETDBREGS
  75 #define PTRACE_GETDBREGS PT_GETDBREGS
  76 #endif
  77
  78 #ifdef PT_SETDBREGS
  79 #define PTRACE_SETDBREGS PT_SETDBREGS
  80 #endif
  81
  82 #ifdef linux
  83 #ifdef HAVE_SYS_USER_H
  84 # include <sys/user.h>
  85 #endif
  86
  87 /* user_regs definitions from asm/user.h */
  88 struct kernel_user_regs_struct
  89 {
  90     long ebx, ecx, edx, esi, edi, ebp, eax;
  91     unsigned short ds, __ds, es, __es;
  92     unsigned short fs, __fs, gs, __gs;
  93     long orig_eax, eip;
  94     unsigned short cs, __cs;
  95     long eflags, esp;
  96     unsigned short ss, __ss;
  97 };
  98
  99 /* debug register offset in struct user */
 100 #define DR_OFFSET(dr) ((int)((((struct user *)0)->u_debugreg) + (dr)))
 101
 102 /* retrieve a debug register */
 103 static inline int get_debug_reg( int pid, int num, DWORD *data )
 104 {
 105     int res;
 106     errno = 0;
 107     res = ptrace( PTRACE_PEEKUSER, pid, DR_OFFSET(num), 0 );
 108     if ((res == -1) && errno)
 109     {
 110         file_set_error();
 111         return -1;
 112     }
 113     *data = res;
 114     return 0;
 115 }
 116
 117 /* retrieve a thread context */
 118 static void get_thread_context_ptrace( struct thread *thread, unsigned int flags, CONTEXT *context )
 119 {
 120     int pid = get_ptrace_pid(thread);
 121     if (flags & CONTEXT_FULL)
 122     {
 123         struct kernel_user_regs_struct regs;
 124         if (ptrace( PTRACE_GETREGS, pid, 0, &regs ) == -1) goto error;
 125         if (flags & CONTEXT_INTEGER)
 126         {
 127             context->Eax = regs.eax;
 128             context->Ebx = regs.ebx;
 129             context->Ecx = regs.ecx;
 130             context->Edx = regs.edx;
 131             context->Esi = regs.esi;
 132             context->Edi = regs.edi;
 133         }
 134         if (flags & CONTEXT_CONTROL)
 135         {
 136             context->Ebp    = regs.ebp;
 137             context->Esp    = regs.esp;
 138             context->Eip    = regs.eip;
 139             context->SegCs  = regs.cs;
 140             context->SegSs  = regs.ss;
 141             context->EFlags = regs.eflags;
 142         }
 143         if (flags & CONTEXT_SEGMENTS)
 144         {
 145             context->SegDs = regs.ds;
 146             context->SegEs = regs.es;
 147             context->SegFs = regs.fs;
 148             context->SegGs = regs.gs;
 149         }
 150     }
 151     if (flags & CONTEXT_DEBUG_REGISTERS)
 152     {
 153         if (get_debug_reg( pid, 0, &context->Dr0 ) == -1) goto error;
 154         if (get_debug_reg( pid, 1, &context->Dr1 ) == -1) goto error;
 155         if (get_debug_reg( pid, 2, &context->Dr2 ) == -1) goto error;
 156         if (get_debug_reg( pid, 3, &context->Dr3 ) == -1) goto error;
 157         if (get_debug_reg( pid, 6, &context->Dr6 ) == -1) goto error;
 158         if (get_debug_reg( pid, 7, &context->Dr7 ) == -1) goto error;
 159     }
 160     if (flags & CONTEXT_FLOATING_POINT)
 161     {
 162         /* we can use context->FloatSave directly as it is using the */
 163         /* correct structure (the same as fsave/frstor) */
 164         if (ptrace( PTRACE_GETFPREGS, pid, 0, &context->FloatSave ) == -1) goto error;
 165         context->FloatSave.Cr0NpxState = 0;  /* FIXME */
 166     }
 167     return;
 168  error:
 169     file_set_error();
 170 }
 171
 172
 173 /* set a thread context */
 174 static void set_thread_context_ptrace( struct thread *thread, unsigned int flags, const CONTEXT *context )
 175 {
 176     int pid = get_ptrace_pid(thread);
 177     if (flags & CONTEXT_FULL)
 178     {
 179         struct kernel_user_regs_struct regs;
 180
 181         /* need to preserve some registers (at a minimum orig_eax must always be preserved) */
 182         if (ptrace( PTRACE_GETREGS, pid, 0, &regs ) == -1) goto error;
 183
 184         if (flags & CONTEXT_INTEGER)
 185         {
 186             regs.eax = context->Eax;
 187             regs.ebx = context->Ebx;
 188             regs.ecx = context->Ecx;
 189             regs.edx = context->Edx;
 190             regs.esi = context->Esi;
 191             regs.edi = context->Edi;
 192         }
 193         if (flags & CONTEXT_CONTROL)
 194         {
 195             regs.ebp = context->Ebp;
 196             regs.esp = context->Esp;
 197             regs.eip = context->Eip;
 198             regs.cs  = context->SegCs;
 199             regs.ss  = context->SegSs;
 200             regs.eflags = context->EFlags;
 201         }
 202         if (flags & CONTEXT_SEGMENTS)
 203         {
 204             regs.ds = context->SegDs;
 205             regs.es = context->SegEs;
 206             regs.fs = context->SegFs;
 207             regs.gs = context->SegGs;
 208         }
 209         if (ptrace( PTRACE_SETREGS, pid, 0, &regs ) == -1) goto error;
 210     }
 211     if (flags & CONTEXT_DEBUG_REGISTERS)
 212     {
 213         if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(0), context->Dr0 ) == -1) goto error;
 214         if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(1), context->Dr1 ) == -1) goto error;
 215         if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(2), context->Dr2 ) == -1) goto error;
 216         if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(3), context->Dr3 ) == -1) goto error;
 217         if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(6), context->Dr6 ) == -1) goto error;
 218         if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->Dr7 ) == -1) goto error;
 219     }
 220     if (flags & CONTEXT_FLOATING_POINT)
 221     {
 222         /* we can use context->FloatSave directly as it is using the */
 223         /* correct structure (the same as fsave/frstor) */
 224         if (ptrace( PTRACE_SETFPREGS, pid, 0, &context->FloatSave ) == -1) goto error;
 225     }
 226     return;
 227  error:
 228     file_set_error();
 229 }
 230
 231 #elif defined(__sun) || defined(__sun__)
 232
 233 /* retrieve a thread context */
 234 static void get_thread_context_ptrace( struct thread *thread, unsigned int flags, CONTEXT *context )
 235 {
 236     int pid = get_ptrace_pid(thread);
 237     if (flags & CONTEXT_FULL)
 238     {
 239         struct regs regs;
 240         if (ptrace( PTRACE_GETREGS, pid, (int) &regs, 0 ) == -1) goto error;
 241         if (flags & CONTEXT_INTEGER)
 242         {
 243             context->Eax = regs.r_eax;
 244             context->Ebx = regs.r_ebx;
 245             context->Ecx = regs.r_ecx;
 246             context->Edx = regs.r_edx;
 247             context->Esi = regs.r_esi;
 248             context->Edi = regs.r_edi;
 249         }
 250         if (flags & CONTEXT_CONTROL)
 251         {
 252             context->Ebp    = regs.r_ebp;
 253             context->Esp    = regs.r_esp;
 254             context->Eip    = regs.r_eip;
 255             context->SegCs  = regs.r_cs & 0xffff;
 256             context->SegSs  = regs.r_ss & 0xffff;
 257             context->EFlags = regs.r_efl;
 258         }
 259         if (flags & CONTEXT_SEGMENTS)
 260         {
 261             context->SegDs = regs.r_ds & 0xffff;
 262             context->SegEs = regs.r_es & 0xffff;
 263             context->SegFs = regs.r_fs & 0xffff;
 264             context->SegGs = regs.r_gs & 0xffff;
 265         }
 266     }
 267     if (flags & CONTEXT_DEBUG_REGISTERS)
 268     {
 269         /* FIXME: How is this done on Solaris? */
 270     }
 271     if (flags & CONTEXT_FLOATING_POINT)
 272     {
 273         /* we can use context->FloatSave directly as it is using the */
 274         /* correct structure (the same as fsave/frstor) */
 275         if (ptrace( PTRACE_GETFPREGS, pid, (int) &context->FloatSave, 0 ) == -1) goto error;
 276         context->FloatSave.Cr0NpxState = 0;  /* FIXME */
 277     }
 278     return;
 279  error:
 280     file_set_error();
 281 }
 282
 283
 284 /* set a thread context */
 285 static void set_thread_context_ptrace( struct thread *thread, unsigned int flags, const CONTEXT *context )
 286 {
 287     int pid = get_ptrace_pid(thread);
 288     if (flags & CONTEXT_FULL)
 289     {
 290         struct regs regs;
 291         if (((flags | CONTEXT_i386) & CONTEXT_FULL) != CONTEXT_FULL)
 292         {
 293             /* need to preserve some registers */
 294             if (ptrace( PTRACE_GETREGS, pid, (int) &regs, 0 ) == -1) goto error;
 295         }
 296         if (flags & CONTEXT_INTEGER)
 297         {
 298             regs.r_eax = context->Eax;
 299             regs.r_ebx = context->Ebx;
 300             regs.r_ecx = context->Ecx;
 301             regs.r_edx = context->Edx;
 302             regs.r_esi = context->Esi;
 303             regs.r_edi = context->Edi;
 304         }
 305         if (flags & CONTEXT_CONTROL)
 306         {
 307             regs.r_ebp = context->Ebp;
 308             regs.r_esp = context->Esp;
 309             regs.r_eip = context->Eip;
 310             regs.r_cs = context->SegCs;
 311             regs.r_ss = context->SegSs;
 312             regs.r_efl = context->EFlags;
 313         }
 314         if (flags & CONTEXT_SEGMENTS)
 315         {
 316             regs.r_ds = context->SegDs;
 317             regs.r_es = context->SegEs;
 318             regs.r_fs = context->SegFs;
 319             regs.r_gs = context->SegGs;
 320         }
 321         if (ptrace( PTRACE_SETREGS, pid, (int) &regs, 0 ) == -1) goto error;
 322     }
 323     if (flags & CONTEXT_DEBUG_REGISTERS)
 324     {
 325         /* FIXME: How is this done on Solaris? */
 326     }
 327     if (flags & CONTEXT_FLOATING_POINT)
 328     {
 329         /* we can use context->FloatSave directly as it is using the */
 330         /* correct structure (the same as fsave/frstor) */
 331         if (ptrace( PTRACE_SETFPREGS, pid, (int) &context->FloatSave, 0 ) == -1) goto error;
 332     }
 333     return;
 334  error:
 335     file_set_error();
 336 }
 337
 338 #elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
 339 #include <machine/reg.h>
 340
 341 /* retrieve a thread context */
 342 static void get_thread_context_ptrace( struct thread *thread, unsigned int flags, CONTEXT *context )
 343 {
 344     int pid = get_ptrace_pid(thread);
 345     if (flags & CONTEXT_FULL)
 346     {
 347         struct reg regs;
 348         if (ptrace( PTRACE_GETREGS, pid, (caddr_t) &regs, 0 ) == -1) goto error;
 349         if (flags & CONTEXT_INTEGER)
 350         {
 351             context->Eax = regs.r_eax;
 352             context->Ebx = regs.r_ebx;
 353             context->Ecx = regs.r_ecx;
 354             context->Edx = regs.r_edx;
 355             context->Esi = regs.r_esi;
 356             context->Edi = regs.r_edi;
 357         }
 358         if (flags & CONTEXT_CONTROL)
 359         {
 360             context->Ebp    = regs.r_ebp;
 361             context->Esp    = regs.r_esp;
 362             context->Eip    = regs.r_eip;
 363             context->SegCs  = regs.r_cs & 0xffff;
 364             context->SegSs  = regs.r_ss & 0xffff;
 365             context->EFlags = regs.r_eflags;
 366         }
 367         if (flags & CONTEXT_SEGMENTS)
 368         {
 369             context->SegDs = regs.r_ds & 0xffff;
 370             context->SegEs = regs.r_es & 0xffff;
 371             context->SegFs = regs.r_fs & 0xffff;
 372             context->SegGs = regs.r_gs & 0xffff;
 373         }
 374     }
 375     if (flags & CONTEXT_DEBUG_REGISTERS)
 376     {
 377 #ifdef PTRACE_GETDBREGS
 378         struct dbreg dbregs;
 379         if (ptrace( PTRACE_GETDBREGS, pid, (caddr_t) &dbregs, 0 ) == -1)
 380                 goto error;
 381 #ifdef DBREG_DRX
 382         /* needed for FreeBSD, the structure fields have changed under 5.x */
 383         context->Dr0 = DBREG_DRX((&dbregs), 0);
 384         context->Dr1 = DBREG_DRX((&dbregs), 1);
 385         context->Dr2 = DBREG_DRX((&dbregs), 2);
 386         context->Dr3 = DBREG_DRX((&dbregs), 3);
 387         context->Dr6 = DBREG_DRX((&dbregs), 6);
 388         context->Dr7 = DBREG_DRX((&dbregs), 7);
 389 #else
 390         context->Dr0 = dbregs.dr0;
 391         context->Dr1 = dbregs.dr1;
 392         context->Dr2 = dbregs.dr2;
 393         context->Dr3 = dbregs.dr3;
 394         context->Dr6 = dbregs.dr6;
 395         context->Dr7 = dbregs.dr7;
 396 #endif
 397
 398 #endif
 399     }
 400     if (flags & CONTEXT_FLOATING_POINT)
 401     {
 402         /* we can use context->FloatSave directly as it is using the */
 403         /* correct structure (the same as fsave/frstor) */
 404         if (ptrace( PTRACE_GETFPREGS, pid, (caddr_t) &context->FloatSave, 0 ) == -1) goto error;
 405         context->FloatSave.Cr0NpxState = 0;  /* FIXME */
 406     }
 407     return;
 408  error:
 409     file_set_error();
 410 }
 411
 412
 413 /* set a thread context */
 414 static void set_thread_context_ptrace( struct thread *thread, unsigned int flags, const CONTEXT *context )
 415 {
 416     int pid = get_ptrace_pid(thread);
 417     if (flags & CONTEXT_FULL)
 418     {
 419         struct reg regs;
 420         if (((flags | CONTEXT_i386) & CONTEXT_FULL) != CONTEXT_FULL)
 421         {
 422             /* need to preserve some registers */
 423             if (ptrace( PTRACE_GETREGS, pid, (caddr_t) &regs, 0 ) == -1) goto error;
 424         }
 425         if (flags & CONTEXT_INTEGER)
 426         {
 427             regs.r_eax = context->Eax;
 428             regs.r_ebx = context->Ebx;
 429             regs.r_ecx = context->Ecx;
 430             regs.r_edx = context->Edx;
 431             regs.r_esi = context->Esi;
 432             regs.r_edi = context->Edi;
 433         }
 434         if (flags & CONTEXT_CONTROL)
 435         {
 436             regs.r_ebp = context->Ebp;
 437             regs.r_esp = context->Esp;
 438             regs.r_eip = context->Eip;
 439             regs.r_cs = context->SegCs;
 440             regs.r_ss = context->SegSs;
 441             regs.r_eflags = context->EFlags;
 442         }
 443         if (flags & CONTEXT_SEGMENTS)
 444         {
 445             regs.r_ds = context->SegDs;
 446             regs.r_es = context->SegEs;
 447             regs.r_fs = context->SegFs;
 448             regs.r_gs = context->SegGs;
 449         }
 450         if (ptrace( PTRACE_SETREGS, pid, (caddr_t) &regs, 0 ) == -1) goto error;
 451     }
 452     if (flags & CONTEXT_DEBUG_REGISTERS)
 453     {
 454 #ifdef PTRACE_SETDBREGS
 455         struct dbreg dbregs;
 456 #ifdef DBREG_DRX
 457         /* needed for FreeBSD, the structure fields have changed under 5.x */
 458         DBREG_DRX((&dbregs), 0) = context->Dr0;
 459         DBREG_DRX((&dbregs), 1) = context->Dr1;
 460         DBREG_DRX((&dbregs), 2) = context->Dr2;
 461         DBREG_DRX((&dbregs), 3) = context->Dr3;
 462         DBREG_DRX((&dbregs), 4) = 0;
 463         DBREG_DRX((&dbregs), 5) = 0;
 464         DBREG_DRX((&dbregs), 6) = context->Dr6;
 465         DBREG_DRX((&dbregs), 7) = context->Dr7;
 466 #else
 467         dbregs.dr0 = context->Dr0;
 468         dbregs.dr1 = context->Dr1;
 469         dbregs.dr2 = context->Dr2;
 470         dbregs.dr3 = context->Dr3;
 471         dbregs.dr4 = 0;
 472         dbregs.dr5 = 0;
 473         dbregs.dr6 = context->Dr6;
 474         dbregs.dr7 = context->Dr7;
 475 #endif
 476         if (ptrace( PTRACE_SETDBREGS, pid, (caddr_t) &dbregs, 0 ) == -1)
 477                 goto error;
 478 #endif
 479     }
 480     if (flags & CONTEXT_FLOATING_POINT)
 481     {
 482         /* we can use context->FloatSave directly as it is using the */
 483         /* correct structure (the same as fsave/frstor) */
 484         if (ptrace( PTRACE_SETFPREGS, pid, (caddr_t) &context->FloatSave, 0 ) == -1) goto error;
 485     }
 486     return;
 487  error:
 488     file_set_error();
 489 }
 490
 491 #else  /* linux || __sun__ || __FreeBSD__ */
 492 #error You must implement get/set_thread_context_ptrace for your platform
 493 #endif  /* linux || __sun__ || __FreeBSD__ */
 494
 495
 496 /* copy a context structure according to the flags */
 497 static void copy_context( CONTEXT *to, const CONTEXT *from, int flags )
 498 {
 499     if (flags & CONTEXT_CONTROL)
 500     {
 501         to->Ebp    = from->Ebp;
 502         to->Eip    = from->Eip;
 503         to->Esp    = from->Esp;
 504         to->SegCs  = from->SegCs;
 505         to->SegSs  = from->SegSs;
 506         to->EFlags = from->EFlags;
 507     }
 508     if (flags & CONTEXT_INTEGER)
 509     {
 510         to->Eax = from->Eax;
 511         to->Ebx = from->Ebx;
 512         to->Ecx = from->Ecx;
 513         to->Edx = from->Edx;
 514         to->Esi = from->Esi;
 515         to->Edi = from->Edi;
 516     }
 517     if (flags & CONTEXT_SEGMENTS)
 518     {
 519         to->SegDs = from->SegDs;
 520         to->SegEs = from->SegEs;
 521         to->SegFs = from->SegFs;
 522         to->SegGs = from->SegGs;
 523     }
 524     if (flags & CONTEXT_FLOATING_POINT)
 525     {
 526         to->FloatSave = from->FloatSave;
 527     }
 528     /* we don't bother copying the debug registers, since they */
 529     /* always need to be accessed by ptrace anyway */
 530 }
 531
 532 /* retrieve the current instruction pointer of a thread */
 533 void *get_thread_ip( struct thread *thread )
 534 {
 535     CONTEXT context;
 536     context.Eip = 0;
 537     if (suspend_for_ptrace( thread ))
 538     {
 539         get_thread_context_ptrace( thread, CONTEXT_CONTROL, &context );
 540         resume_after_ptrace( thread );
 541     }
 542     return (void *)context.Eip;
 543 }
 544
 545 /* determine if we should continue the thread in single-step mode */
 546 int get_thread_single_step( struct thread *thread )
 547 {
 548     CONTEXT context;
 549     if (thread->context) return 0;  /* don't single-step inside exception event */
 550     get_thread_context_ptrace( thread, CONTEXT_CONTROL, &context );
 551     return (context.EFlags & 0x100) != 0;
 552 }
 553
 554 /* send a signal to a specific thread */
 555 int tkill( int pid, int sig )
 556 {
 557 #ifdef __linux__
 558     int ret;
 559     __asm__( "pushl %%ebx\n\t"
 560              "movl %2,%%ebx\n\t"
 561              "int $0x80\n\t"
 562              "popl %%ebx\n\t"
 563              : "=a" (ret)
 564              : "0" (238) /*SYS_tkill*/, "r" (pid), "c" (sig) );
 565     if (ret >= 0) return ret;
 566     errno = -ret;
 567     return -1;
 568 #else
 569     errno = ENOSYS;
 570     return -1;
 571 #endif
 572 }
 573
 574 /* retrieve the thread context */
 575 void get_thread_context( struct thread *thread, CONTEXT *context, unsigned int flags )
 576 {
 577     flags &= ~CONTEXT_i386;  /* get rid of CPU id */
 578
 579     if (thread->context)  /* thread is inside an exception event or suspended */
 580     {
 581         copy_context( context, thread->context, flags );
 582         flags &= CONTEXT_DEBUG_REGISTERS;
 583     }
 584
 585     if (flags && suspend_for_ptrace( thread ))
 586     {
 587         get_thread_context_ptrace( thread, flags, context );
 588         resume_after_ptrace( thread );
 589     }
 590 }
 591
 592 /* set the thread context */
 593 void set_thread_context( struct thread *thread, const CONTEXT *context, unsigned int flags )
 594 {
 595     flags &= ~CONTEXT_i386;  /* get rid of CPU id */
 596
 597     if (thread->context)  /* thread is inside an exception event or suspended */
 598     {
 599         copy_context( thread->context, context, flags );
 600         flags &= CONTEXT_DEBUG_REGISTERS;
 601     }
 602
 603     if (flags && suspend_for_ptrace( thread ))
 604     {
 605         set_thread_context_ptrace( thread, flags, context );
 606         resume_after_ptrace( thread );
 607     }
 608 }
 609
 610 #endif  /* __i386__ */