server/debugger.c

   1 /*
   2  * Server-side debugger functions
   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <signal.h>
  26 #include <string.h>
  27 #include <stdarg.h>
  28 #include <stdio.h>
  29
  30 #include "ntstatus.h"
  31 #define WIN32_NO_STATUS
  32 #include "windef.h"
  33 #include "winternl.h"
  34
  35 #include "handle.h"
  36 #include "file.h"
  37 #include "process.h"
  38 #include "thread.h"
  39 #include "request.h"
  40
  41 enum debug_event_state { EVENT_QUEUED, EVENT_SENT, EVENT_CONTINUED };
  42
  43 /* debug event */
  44 struct debug_event
  45 {
  46     struct object          obj;       /* object header */
  47     struct list            entry;     /* entry in event queue */
  48     struct thread         *sender;    /* thread which sent this event */
  49     struct thread         *debugger;  /* debugger thread receiving the event */
  50     enum debug_event_state state;     /* event state */
  51     int                    status;    /* continuation status */
  52     debug_event_t          data;      /* event data */
  53     context_t              context;   /* register context */
  54 };
  55
  56 /* debug context */
  57 struct debug_ctx
  58 {
  59     struct object        obj;         /* object header */
  60     struct list          event_queue; /* pending events queue */
  61     int                  kill_on_exit;/* kill debuggees on debugger exit ? */
  62 };
  63
  64
  65 static void debug_event_dump( struct object *obj, int verbose );
  66 static int debug_event_signaled( struct object *obj, struct wait_queue_entry *entry );
  67 static void debug_event_destroy( struct object *obj );
  68
  69 static const struct object_ops debug_event_ops =
  70 {
  71     sizeof(struct debug_event),    /* size */
  72     debug_event_dump,              /* dump */
  73     no_get_type,                   /* get_type */
  74     add_queue,                     /* add_queue */
  75     remove_queue,                  /* remove_queue */
  76     debug_event_signaled,          /* signaled */
  77     no_satisfied,                  /* satisfied */
  78     no_signal,                     /* signal */
  79     no_get_fd,                     /* get_fd */
  80     no_map_access,                 /* map_access */
  81     default_get_sd,                /* get_sd */
  82     default_set_sd,                /* set_sd */
  83     no_lookup_name,                /* lookup_name */
  84     no_link_name,                  /* link_name */
  85     NULL,                          /* unlink_name */
  86     no_open_file,                  /* open_file */
  87     no_kernel_obj_list,            /* get_kernel_obj_list */
  88     no_close_handle,               /* close_handle */
  89     debug_event_destroy            /* destroy */
  90 };
  91
  92 static void debug_ctx_dump( struct object *obj, int verbose );
  93 static int debug_ctx_signaled( struct object *obj, struct wait_queue_entry *entry );
  94 static void debug_ctx_destroy( struct object *obj );
  95
  96 static const struct object_ops debug_ctx_ops =
  97 {
  98     sizeof(struct debug_ctx),      /* size */
  99     debug_ctx_dump,                /* dump */
 100     no_get_type,                   /* get_type */
 101     add_queue,                     /* add_queue */
 102     remove_queue,                  /* remove_queue */
 103     debug_ctx_signaled,            /* signaled */
 104     no_satisfied,                  /* satisfied */
 105     no_signal,                     /* signal */
 106     no_get_fd,                     /* get_fd */
 107     no_map_access,                 /* map_access */
 108     default_get_sd,                /* get_sd */
 109     default_set_sd,                /* set_sd */
 110     no_lookup_name,                /* lookup_name */
 111     no_link_name,                  /* link_name */
 112     NULL,                          /* unlink_name */
 113     no_open_file,                  /* open_file */
 114     no_kernel_obj_list,            /* get_kernel_obj_list */
 115     no_close_handle,               /* close_handle */
 116     debug_ctx_destroy              /* destroy */
 117 };
 118
 119
 120 /* routines to build an event according to its type */
 121
 122 static int fill_exception_event( struct debug_event *event, const void *arg )
 123 {
 124     const debug_event_t *data = arg;
 125     event->data.exception = data->exception;
 126     event->data.exception.nb_params = min( event->data.exception.nb_params, EXCEPTION_MAXIMUM_PARAMETERS );
 127     return 1;
 128 }
 129
 130 static int fill_create_thread_event( struct debug_event *event, const void *arg )
 131 {
 132     struct process *debugger = event->debugger->process;
 133     struct thread *thread = event->sender;
 134     const client_ptr_t *entry = arg;
 135     obj_handle_t handle;
 136
 137     /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
 138     if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 ))) return 0;
 139     event->data.create_thread.handle = handle;
 140     event->data.create_thread.teb    = thread->teb;
 141     if (entry) event->data.create_thread.start = *entry;
 142     return 1;
 143 }
 144
 145 static int fill_create_process_event( struct debug_event *event, const void *arg )
 146 {
 147     struct process *debugger = event->debugger->process;
 148     struct thread *thread = event->sender;
 149     struct process *process = thread->process;
 150     struct process_dll *exe_module = get_process_exe_module( process );
 151     const client_ptr_t *entry = arg;
 152     struct file *file;
 153     obj_handle_t handle;
 154
 155     /* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
 156     if (!(handle = alloc_handle( debugger, process, PROCESS_ALL_ACCESS, 0 ))) return 0;
 157     event->data.create_process.process = handle;
 158
 159     /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
 160     if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 )))
 161     {
 162         close_handle( debugger, event->data.create_process.process );
 163         return 0;
 164     }
 165     event->data.create_process.thread     = handle;
 166     event->data.create_process.file       = 0;
 167     event->data.create_process.teb        = thread->teb;
 168     event->data.create_process.base       = exe_module->base;
 169     event->data.create_process.start      = *entry;
 170     event->data.create_process.dbg_offset = exe_module->dbg_offset;
 171     event->data.create_process.dbg_size   = exe_module->dbg_size;
 172     event->data.create_process.name       = exe_module->name;
 173     event->data.create_process.unicode    = 1;
 174
 175     /* the doc says write access too, but this doesn't seem a good idea */
 176     if ((file = get_mapping_file( process, exe_module->base, GENERIC_READ,
 177                                   FILE_SHARE_READ | FILE_SHARE_WRITE )))
 178     {
 179         event->data.create_process.file = alloc_handle( debugger, file, GENERIC_READ, 0 );
 180         release_object( file );
 181     }
 182     return 1;
 183 }
 184
 185 static int fill_exit_thread_event( struct debug_event *event, const void *arg )
 186 {
 187     const struct thread *thread = arg;
 188     event->data.exit.exit_code = thread->exit_code;
 189     return 1;
 190 }
 191
 192 static int fill_exit_process_event( struct debug_event *event, const void *arg )
 193 {
 194     const struct process *process = arg;
 195     event->data.exit.exit_code = process->exit_code;
 196     return 1;
 197 }
 198
 199 static int fill_load_dll_event( struct debug_event *event, const void *arg )
 200 {
 201     struct process *process = event->sender->process;
 202     struct process *debugger = event->debugger->process;
 203     const struct process_dll *dll = arg;
 204     struct file *file;
 205
 206     event->data.load_dll.handle     = 0;
 207     event->data.load_dll.base       = dll->base;
 208     event->data.load_dll.dbg_offset = dll->dbg_offset;
 209     event->data.load_dll.dbg_size   = dll->dbg_size;
 210     event->data.load_dll.name       = dll->name;
 211     event->data.load_dll.unicode    = 1;
 212     if ((file = get_mapping_file( process, dll->base, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE )))
 213     {
 214         event->data.load_dll.handle = alloc_handle( debugger, file, GENERIC_READ, 0 );
 215         release_object( file );
 216     }
 217     return 1;
 218 }
 219
 220 static int fill_unload_dll_event( struct debug_event *event, const void *arg )
 221 {
 222     const mod_handle_t *base = arg;
 223     event->data.unload_dll.base = *base;
 224     return 1;
 225 }
 226
 227 typedef int (*fill_event_func)( struct debug_event *event, const void *arg );
 228
 229 #define NB_DEBUG_EVENTS UNLOAD_DLL_DEBUG_EVENT
 230
 231 static const fill_event_func fill_debug_event[NB_DEBUG_EVENTS] =
 232 {
 233     fill_exception_event,            /* EXCEPTION_DEBUG_EVENT */
 234     fill_create_thread_event,        /* CREATE_THREAD_DEBUG_EVENT */
 235     fill_create_process_event,       /* CREATE_PROCESS_DEBUG_EVENT */
 236     fill_exit_thread_event,          /* EXIT_THREAD_DEBUG_EVENT */
 237     fill_exit_process_event,         /* EXIT_PROCESS_DEBUG_EVENT */
 238     fill_load_dll_event,             /* LOAD_DLL_DEBUG_EVENT */
 239     fill_unload_dll_event            /* UNLOAD_DLL_DEBUG_EVENT */
 240 };
 241
 242
 243 /* unlink the first event from the queue */
 244 static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event )
 245 {
 246     list_remove( &event->entry );
 247     if (event->sender->process->debug_event == event) event->sender->process->debug_event = NULL;
 248     release_object( event );
 249 }
 250
 251 /* link an event at the end of the queue */
 252 static void link_event( struct debug_event *event )
 253 {
 254     struct debug_ctx *debug_ctx = event->debugger->debug_ctx;
 255
 256     assert( debug_ctx );
 257     grab_object( event );
 258     list_add_tail( &debug_ctx->event_queue, &event->entry );
 259     if (!event->sender->process->debug_event)
 260     {
 261         /* grab reference since debugger could be killed while trying to wake up */
 262         grab_object( debug_ctx );
 263         wake_up( &debug_ctx->obj, 0 );
 264         release_object( debug_ctx );
 265     }
 266 }
 267
 268 /* find the next event that we can send to the debugger */
 269 static struct debug_event *find_event_to_send( struct debug_ctx *debug_ctx )
 270 {
 271     struct debug_event *event;
 272
 273     LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
 274     {
 275         if (event->state == EVENT_SENT) continue;  /* already sent */
 276         if (event->sender->process->debug_event) continue;  /* process busy with another one */
 277         return event;
 278     }
 279     return NULL;
 280 }
 281
 282 static void debug_event_dump( struct object *obj, int verbose )
 283 {
 284     struct debug_event *debug_event = (struct debug_event *)obj;
 285     assert( obj->ops == &debug_event_ops );
 286     fprintf( stderr, "Debug event sender=%p code=%d state=%d\n",
 287              debug_event->sender, debug_event->data.code, debug_event->state );
 288 }
 289
 290 static int debug_event_signaled( struct object *obj, struct wait_queue_entry *entry )
 291 {
 292     struct debug_event *debug_event = (struct debug_event *)obj;
 293     assert( obj->ops == &debug_event_ops );
 294     return debug_event->state == EVENT_CONTINUED;
 295 }
 296
 297 static void debug_event_destroy( struct object *obj )
 298 {
 299     struct debug_event *event = (struct debug_event *)obj;
 300     assert( obj->ops == &debug_event_ops );
 301
 302     /* If the event has been sent already, the handles are now under the */
 303     /* responsibility of the debugger process, so we don't touch them    */
 304     if (event->state == EVENT_QUEUED)
 305     {
 306         struct process *debugger = event->debugger->process;
 307         switch(event->data.code)
 308         {
 309         case CREATE_THREAD_DEBUG_EVENT:
 310             close_handle( debugger, event->data.create_thread.handle );
 311             break;
 312         case CREATE_PROCESS_DEBUG_EVENT:
 313             if (event->data.create_process.file)
 314                 close_handle( debugger, event->data.create_process.file );
 315             close_handle( debugger, event->data.create_process.thread );
 316             close_handle( debugger, event->data.create_process.process );
 317             break;
 318         case LOAD_DLL_DEBUG_EVENT:
 319             if (event->data.load_dll.handle)
 320                 close_handle( debugger, event->data.load_dll.handle );
 321             break;
 322         }
 323     }
 324     if (event->sender->context == &event->context)
 325     {
 326         event->sender->context = NULL;
 327         stop_thread_if_suspended( event->sender );
 328     }
 329     release_object( event->sender );
 330     release_object( event->debugger );
 331 }
 332
 333 static void debug_ctx_dump( struct object *obj, int verbose )
 334 {
 335     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 336     assert( obj->ops == &debug_ctx_ops );
 337     fprintf( stderr, "Debug context head=%p tail=%p\n",
 338              debug_ctx->event_queue.next, debug_ctx->event_queue.prev );
 339 }
 340
 341 static int debug_ctx_signaled( struct object *obj, struct wait_queue_entry *entry )
 342 {
 343     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 344     assert( obj->ops == &debug_ctx_ops );
 345     return find_event_to_send( debug_ctx ) != NULL;
 346 }
 347
 348 static void debug_ctx_destroy( struct object *obj )
 349 {
 350     struct list *ptr;
 351     struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
 352     assert( obj->ops == &debug_ctx_ops );
 353
 354     /* free all pending events */
 355     while ((ptr = list_head( &debug_ctx->event_queue )))
 356         unlink_event( debug_ctx, LIST_ENTRY( ptr, struct debug_event, entry ));
 357 }
 358
 359 /* continue a debug event */
 360 static int continue_debug_event( struct process *process, struct thread *thread, int status )
 361 {
 362     struct debug_ctx *debug_ctx = current->debug_ctx;
 363
 364     if (debug_ctx && process->debugger == current && thread->process == process)
 365     {
 366         struct debug_event *event;
 367
 368         /* find the event in the queue */
 369         LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
 370         {
 371             if (event->state != EVENT_SENT) continue;
 372             if (event->sender == thread)
 373             {
 374                 assert( event->sender->process->debug_event == event );
 375
 376                 event->status = status;
 377                 event->state  = EVENT_CONTINUED;
 378                 wake_up( &event->obj, 0 );
 379                 unlink_event( debug_ctx, event );
 380                 resume_process( process );
 381                 return 1;
 382             }
 383         }
 384     }
 385     /* not debugging this process, or no such event */
 386     set_error( STATUS_ACCESS_DENIED );  /* FIXME */
 387     return 0;
 388 }
 389
 390 /* alloc a debug event for a debugger */
 391 static struct debug_event *alloc_debug_event( struct thread *thread, int code, const void *arg )
 392 {
 393     struct thread *debugger = thread->process->debugger;
 394     struct debug_event *event;
 395
 396     assert( code > 0 && code <= NB_DEBUG_EVENTS );
 397     /* cannot queue a debug event for myself */
 398     assert( debugger->process != thread->process );
 399
 400     /* build the event */
 401     if (!(event = alloc_object( &debug_event_ops ))) return NULL;
 402     event->state     = EVENT_QUEUED;
 403     event->sender    = (struct thread *)grab_object( thread );
 404     event->debugger  = (struct thread *)grab_object( debugger );
 405     memset( &event->data, 0, sizeof(event->data) );
 406
 407     if (!fill_debug_event[code-1]( event, arg ))
 408     {
 409         event->data.code = -1;  /* make sure we don't attempt to close handles */
 410         release_object( event );
 411         return NULL;
 412     }
 413     event->data.code = code;
 414     return event;
 415 }
 416
 417 /* generate a debug event from inside the server and queue it */
 418 void generate_debug_event( struct thread *thread, int code, const void *arg )
 419 {
 420     if (thread->process->debugger)
 421     {
 422         struct debug_event *event = alloc_debug_event( thread, code, arg );
 423         if (event)
 424         {
 425             link_event( event );
 426             suspend_process( thread->process );
 427             release_object( event );
 428         }
 429         clear_error();  /* ignore errors */
 430     }
 431 }
 432
 433 /* attach a process to a debugger thread and suspend it */
 434 static int debugger_attach( struct process *process, struct thread *debugger )
 435 {
 436     if (process->debugger) goto error;  /* already being debugged */
 437     if (debugger->process == process) goto error;
 438     if (!is_process_init_done( process )) goto error;  /* still starting up */
 439     if (list_empty( &process->thread_list )) goto error;  /* no thread running in the process */
 440
 441     /* don't let a debugger debug its console... won't work */
 442     if (debugger->process->console)
 443     {
 444         struct thread *renderer = console_get_renderer(debugger->process->console);
 445         if (renderer && renderer->process == process)
 446             goto error;
 447     }
 448
 449     suspend_process( process );
 450     if (!set_process_debugger( process, debugger ))
 451     {
 452         resume_process( process );
 453         return 0;
 454     }
 455     if (!set_process_debug_flag( process, 1 ))
 456     {
 457         process->debugger = NULL;
 458         resume_process( process );
 459         return 0;
 460     }
 461     process->debug_children = 0;
 462     return 1;
 463
 464  error:
 465     set_error( STATUS_ACCESS_DENIED );
 466     return 0;
 467 }
 468
 469
 470 /* detach a process from a debugger thread (and resume it ?) */
 471 int debugger_detach( struct process *process, struct thread *debugger )
 472 {
 473     struct debug_event *event, *next;
 474     struct debug_ctx *debug_ctx;
 475
 476     if (!process->debugger || process->debugger != debugger)
 477         goto error;  /* not currently debugged, or debugged by another debugger */
 478     if (!debugger->debug_ctx ) goto error; /* should be a debugger */
 479     /* init should be done, otherwise wouldn't be attached */
 480     assert(is_process_init_done(process));
 481
 482     suspend_process( process );
 483     /* send continue indication for all events */
 484     debug_ctx = debugger->debug_ctx;
 485
 486     /* free all events from this process */
 487     LIST_FOR_EACH_ENTRY_SAFE( event, next, &debug_ctx->event_queue, struct debug_event, entry )
 488     {
 489         if (event->sender->process != process) continue;
 490
 491         assert( event->state != EVENT_CONTINUED );
 492         event->status = DBG_CONTINUE;
 493         event->state  = EVENT_CONTINUED;
 494         wake_up( &event->obj, 0 );
 495         unlink_event( debug_ctx, event );
 496         /* from queued debug event */
 497         resume_process( process );
 498     }
 499
 500     /* remove relationships between process and its debugger */
 501     process->debugger = NULL;
 502     if (!set_process_debug_flag( process, 0 )) clear_error();  /* ignore error */
 503
 504     /* from this function */
 505     resume_process( process );
 506     return 0;
 507
 508  error:
 509     set_error( STATUS_ACCESS_DENIED );
 510     return 0;
 511 }
 512
 513 /* generate all startup events of a given process */
 514 void generate_startup_debug_events( struct process *process, client_ptr_t entry )
 515 {
 516     struct list *ptr;
 517     struct thread *thread, *first_thread = get_process_first_thread( process );
 518
 519     generate_debug_event( first_thread, CREATE_PROCESS_DEBUG_EVENT, &entry );
 520     ptr = list_head( &process->dlls ); /* skip main module reported in create process event */
 521
 522     /* generate ntdll.dll load event */
 523     if (ptr && (ptr = list_next( &process->dlls, ptr )))
 524     {
 525         struct process_dll *dll = LIST_ENTRY( ptr, struct process_dll, entry );
 526         generate_debug_event( first_thread, LOAD_DLL_DEBUG_EVENT, dll );
 527     }
 528
 529     /* generate creation events */
 530     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 531     {
 532         if (thread != first_thread)
 533             generate_debug_event( thread, CREATE_THREAD_DEBUG_EVENT, NULL );
 534     }
 535
 536     /* generate dll events (in loading order) */
 537     while (ptr && (ptr = list_next( &process->dlls, ptr )))
 538     {
 539         struct process_dll *dll = LIST_ENTRY( ptr, struct process_dll, entry );
 540         generate_debug_event( first_thread, LOAD_DLL_DEBUG_EVENT, dll );
 541     }
 542 }
 543
 544 /* set the debugger of a given process */
 545 int set_process_debugger( struct process *process, struct thread *debugger )
 546 {
 547     struct debug_ctx *debug_ctx;
 548
 549     assert( !process->debugger );
 550
 551     if (!debugger->debug_ctx)  /* need to allocate a context */
 552     {
 553         if (!(debug_ctx = alloc_object( &debug_ctx_ops ))) return 0;
 554         debug_ctx->kill_on_exit = 1;
 555         list_init( &debug_ctx->event_queue );
 556         debugger->debug_ctx = debug_ctx;
 557     }
 558     process->debugger = debugger;
 559     return 1;
 560 }
 561
 562 /* a thread is exiting */
 563 void debug_exit_thread( struct thread *thread )
 564 {
 565     if (thread->debug_ctx)  /* this thread is a debugger */
 566     {
 567         if (thread->debug_ctx->kill_on_exit)
 568         {
 569             /* kill all debugged processes */
 570             kill_debugged_processes( thread, STATUS_DEBUGGER_INACTIVE );
 571         }
 572         else
 573         {
 574             detach_debugged_processes( thread );
 575         }
 576         release_object( thread->debug_ctx );
 577         thread->debug_ctx = NULL;
 578     }
 579 }
 580
 581 /* Wait for a debug event */
 582 DECL_HANDLER(wait_debug_event)
 583 {
 584     struct debug_ctx *debug_ctx = current->debug_ctx;
 585     struct debug_event *event;
 586
 587     if (!debug_ctx)  /* current thread is not a debugger */
 588     {
 589         set_error( STATUS_INVALID_HANDLE );
 590         return;
 591     }
 592     reply->wait = 0;
 593     if ((event = find_event_to_send( debug_ctx )))
 594     {
 595         data_size_t size = get_reply_max_size();
 596         event->state = EVENT_SENT;
 597         event->sender->process->debug_event = event;
 598         reply->pid = get_process_id( event->sender->process );
 599         reply->tid = get_thread_id( event->sender );
 600         if (size > sizeof(debug_event_t)) size = sizeof(debug_event_t);
 601         set_reply_data( &event->data, size );
 602     }
 603     else  /* no event ready */
 604     {
 605         reply->pid  = 0;
 606         reply->tid  = 0;
 607         if (req->get_handle)
 608             reply->wait = alloc_handle( current->process, debug_ctx, SYNCHRONIZE, 0 );
 609     }
 610 }
 611
 612 /* Continue a debug event */
 613 DECL_HANDLER(continue_debug_event)
 614 {
 615     struct process *process = get_process_from_id( req->pid );
 616     if (process)
 617     {
 618         struct thread *thread = get_thread_from_id( req->tid );
 619         if (thread)
 620         {
 621             continue_debug_event( process, thread, req->status );
 622             release_object( thread );
 623         }
 624         release_object( process );
 625     }
 626 }
 627
 628 /* Start debugging an existing process */
 629 DECL_HANDLER(debug_process)
 630 {
 631     struct process *process = get_process_from_id( req->pid );
 632     if (!process) return;
 633
 634     if (!req->attach)
 635     {
 636         debugger_detach( process, current );
 637     }
 638     else if (debugger_attach( process, current ))
 639     {
 640         generate_startup_debug_events( process, 0 );
 641         resume_process( process );
 642     }
 643     release_object( process );
 644 }
 645
 646 /* queue an exception event */
 647 DECL_HANDLER(queue_exception_event)
 648 {
 649     reply->handle = 0;
 650     if (current->process->debugger)
 651     {
 652         debug_event_t data;
 653         struct debug_event *event;
 654         struct thread *thread = current;
 655
 656         if ((req->len % sizeof(client_ptr_t)) != 0 ||
 657             req->len > get_req_data_size() ||
 658             req->len > EXCEPTION_MAXIMUM_PARAMETERS * sizeof(client_ptr_t))
 659         {
 660             set_error( STATUS_INVALID_PARAMETER );
 661             return;
 662         }
 663         memset( &data, 0, sizeof(data) );
 664         data.exception.first     = req->first;
 665         data.exception.exc_code  = req->code;
 666         data.exception.flags     = req->flags;
 667         data.exception.record    = req->record;
 668         data.exception.address   = req->address;
 669         data.exception.nb_params = req->len / sizeof(client_ptr_t);
 670         memcpy( data.exception.params, get_req_data(), req->len );
 671
 672         if ((event = alloc_debug_event( thread, EXCEPTION_DEBUG_EVENT, &data )))
 673         {
 674             const context_t *context = (const context_t *)((const char *)get_req_data() + req->len);
 675             data_size_t size = get_req_data_size() - req->len;
 676
 677             memset( &event->context, 0, sizeof(event->context) );
 678             memcpy( &event->context, context, min( sizeof(event->context), size ) );
 679             thread->context = &event->context;
 680
 681             if ((reply->handle = alloc_handle( thread->process, event, SYNCHRONIZE, 0 )))
 682             {
 683                 link_event( event );
 684                 suspend_process( thread->process );
 685             }
 686             release_object( event );
 687         }
 688     }
 689 }
 690
 691 /* retrieve the status of an exception event */
 692 DECL_HANDLER(get_exception_status)
 693 {
 694     struct debug_event *event;
 695
 696     if ((event = (struct debug_event *)get_handle_obj( current->process, req->handle,
 697                                                        0, &debug_event_ops )))
 698     {
 699         close_handle( current->process, req->handle );
 700         if (event->state == EVENT_CONTINUED)
 701         {
 702             if (current->context == &event->context)
 703             {
 704                 data_size_t size = min( sizeof(context_t), get_reply_max_size() );
 705                 set_reply_data( &event->context, size );
 706                 current->context = NULL;
 707                 stop_thread_if_suspended( current );
 708             }
 709             set_error( event->status );
 710         }
 711         else set_error( STATUS_PENDING );
 712         release_object( event );
 713     }
 714 }
 715
 716 /* set debugger kill on exit flag */
 717 DECL_HANDLER(set_debugger_kill_on_exit)
 718 {
 719     if (!current->debug_ctx)
 720     {
 721         set_error( STATUS_ACCESS_DENIED );
 722         return;
 723     }
 724     current->debug_ctx->kill_on_exit = req->kill_on_exit;
 725 }