2 * Server-side debugger functions
4 * Copyright (C) 1999 Alexandre Julliard
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.
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.
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
22 #include "wine/port.h"
31 #define WIN32_NO_STATUS
41 enum debug_event_state { EVENT_QUEUED, EVENT_SENT, EVENT_CONTINUED };
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 context; /* register context */
59 struct object obj; /* object header */
60 struct list event_queue; /* pending events queue */
61 int kill_on_exit;/* kill debuggees on debugger exit ? */
65 static void debug_event_dump( struct object *obj, int verbose );
66 static int debug_event_signaled( struct object *obj, struct thread *thread );
67 static void debug_event_destroy( struct object *obj );
69 static const struct object_ops debug_event_ops =
71 sizeof(struct debug_event), /* size */
72 debug_event_dump, /* dump */
73 add_queue, /* add_queue */
74 remove_queue, /* remove_queue */
75 debug_event_signaled, /* signaled */
76 no_satisfied, /* satisfied */
77 no_signal, /* signal */
78 no_get_fd, /* get_fd */
79 no_map_access, /* map_access */
80 no_lookup_name, /* lookup_name */
81 no_close_handle, /* close_handle */
82 debug_event_destroy /* destroy */
85 static void debug_ctx_dump( struct object *obj, int verbose );
86 static int debug_ctx_signaled( struct object *obj, struct thread *thread );
87 static void debug_ctx_destroy( struct object *obj );
89 static const struct object_ops debug_ctx_ops =
91 sizeof(struct debug_ctx), /* size */
92 debug_ctx_dump, /* dump */
93 add_queue, /* add_queue */
94 remove_queue, /* remove_queue */
95 debug_ctx_signaled, /* signaled */
96 no_satisfied, /* satisfied */
97 no_signal, /* signal */
98 no_get_fd, /* get_fd */
99 no_map_access, /* map_access */
100 no_lookup_name, /* lookup_name */
101 no_close_handle, /* close_handle */
102 debug_ctx_destroy /* destroy */
106 /* routines to build an event according to its type */
108 static int fill_exception_event( struct debug_event *event, void *arg )
110 memcpy( &event->data.info.exception, arg, sizeof(event->data.info.exception) );
114 static int fill_create_thread_event( struct debug_event *event, void *arg )
116 struct process *debugger = event->debugger->process;
117 struct thread *thread = event->sender;
120 /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
121 if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 ))) return 0;
122 event->data.info.create_thread.handle = handle;
123 event->data.info.create_thread.teb = thread->teb;
124 event->data.info.create_thread.start = arg;
128 static int fill_create_process_event( struct debug_event *event, void *arg )
130 struct process *debugger = event->debugger->process;
131 struct thread *thread = event->sender;
132 struct process *process = thread->process;
133 struct process_dll *exe_module = get_process_exe_module( process );
136 /* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
137 if (!(handle = alloc_handle( debugger, process, PROCESS_ALL_ACCESS, 0 ))) return 0;
138 event->data.info.create_process.process = handle;
140 /* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
141 if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 )))
143 close_handle( debugger, event->data.info.create_process.process, NULL );
146 event->data.info.create_process.thread = handle;
149 if (exe_module->file &&
150 /* the doc says write access too, but this doesn't seem a good idea */
151 !(handle = alloc_handle( debugger, exe_module->file, GENERIC_READ, 0 )))
153 close_handle( debugger, event->data.info.create_process.process, NULL );
154 close_handle( debugger, event->data.info.create_process.thread, NULL );
157 event->data.info.create_process.file = handle;
158 event->data.info.create_process.teb = thread->teb;
159 event->data.info.create_process.base = exe_module->base;
160 event->data.info.create_process.start = arg;
161 event->data.info.create_process.dbg_offset = exe_module->dbg_offset;
162 event->data.info.create_process.dbg_size = exe_module->dbg_size;
163 event->data.info.create_process.name = exe_module->name;
164 event->data.info.create_process.unicode = 1;
168 static int fill_exit_thread_event( struct debug_event *event, void *arg )
170 struct thread *thread = arg;
171 event->data.info.exit.exit_code = thread->exit_code;
175 static int fill_exit_process_event( struct debug_event *event, void *arg )
177 struct process *process = arg;
178 event->data.info.exit.exit_code = process->exit_code;
182 static int fill_load_dll_event( struct debug_event *event, void *arg )
184 struct process *debugger = event->debugger->process;
185 struct process_dll *dll = arg;
186 obj_handle_t handle = 0;
188 if (dll->file && !(handle = alloc_handle( debugger, dll->file, GENERIC_READ, 0 )))
190 event->data.info.load_dll.handle = handle;
191 event->data.info.load_dll.base = dll->base;
192 event->data.info.load_dll.dbg_offset = dll->dbg_offset;
193 event->data.info.load_dll.dbg_size = dll->dbg_size;
194 event->data.info.load_dll.name = dll->name;
195 event->data.info.load_dll.unicode = 1;
199 static int fill_unload_dll_event( struct debug_event *event, void *arg )
201 event->data.info.unload_dll.base = arg;
205 static int fill_output_debug_string_event( struct debug_event *event, void *arg )
207 struct debug_event_output_string *data = arg;
208 event->data.info.output_string = *data;
212 typedef int (*fill_event_func)( struct debug_event *event, void *arg );
214 #define NB_DEBUG_EVENTS OUTPUT_DEBUG_STRING_EVENT /* RIP_EVENT not supported */
216 static const fill_event_func fill_debug_event[NB_DEBUG_EVENTS] =
218 fill_exception_event, /* EXCEPTION_DEBUG_EVENT */
219 fill_create_thread_event, /* CREATE_THREAD_DEBUG_EVENT */
220 fill_create_process_event, /* CREATE_PROCESS_DEBUG_EVENT */
221 fill_exit_thread_event, /* EXIT_THREAD_DEBUG_EVENT */
222 fill_exit_process_event, /* EXIT_PROCESS_DEBUG_EVENT */
223 fill_load_dll_event, /* LOAD_DLL_DEBUG_EVENT */
224 fill_unload_dll_event, /* UNLOAD_DLL_DEBUG_EVENT */
225 fill_output_debug_string_event /* OUTPUT_DEBUG_STRING_EVENT */
229 /* unlink the first event from the queue */
230 static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event )
232 list_remove( &event->entry );
233 if (event->sender->debug_event == event) event->sender->debug_event = NULL;
234 release_object( event );
237 /* link an event at the end of the queue */
238 static void link_event( struct debug_event *event )
240 struct debug_ctx *debug_ctx = event->debugger->debug_ctx;
243 grab_object( event );
244 list_add_tail( &debug_ctx->event_queue, &event->entry );
245 if (!event->sender->debug_event) wake_up( &debug_ctx->obj, 0 );
248 /* find the next event that we can send to the debugger */
249 static struct debug_event *find_event_to_send( struct debug_ctx *debug_ctx )
251 struct debug_event *event;
253 LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
255 if (event->state == EVENT_SENT) continue; /* already sent */
256 if (event->sender->debug_event) continue; /* thread busy with another one */
262 static void debug_event_dump( struct object *obj, int verbose )
264 struct debug_event *debug_event = (struct debug_event *)obj;
265 assert( obj->ops == &debug_event_ops );
266 fprintf( stderr, "Debug event sender=%p code=%d state=%d\n",
267 debug_event->sender, debug_event->data.code, debug_event->state );
270 static int debug_event_signaled( struct object *obj, struct thread *thread )
272 struct debug_event *debug_event = (struct debug_event *)obj;
273 assert( obj->ops == &debug_event_ops );
274 return debug_event->state == EVENT_CONTINUED;
277 static void debug_event_destroy( struct object *obj )
279 struct debug_event *event = (struct debug_event *)obj;
280 assert( obj->ops == &debug_event_ops );
282 /* If the event has been sent already, the handles are now under the */
283 /* responsibility of the debugger process, so we don't touch them */
284 if (event->state == EVENT_QUEUED)
286 struct process *debugger = event->debugger->process;
287 switch(event->data.code)
289 case CREATE_THREAD_DEBUG_EVENT:
290 close_handle( debugger, event->data.info.create_thread.handle, NULL );
292 case CREATE_PROCESS_DEBUG_EVENT:
293 if (event->data.info.create_process.file)
294 close_handle( debugger, event->data.info.create_process.file, NULL );
295 close_handle( debugger, event->data.info.create_process.thread, NULL );
296 close_handle( debugger, event->data.info.create_process.process, NULL );
298 case LOAD_DLL_DEBUG_EVENT:
299 if (event->data.info.load_dll.handle)
300 close_handle( debugger, event->data.info.load_dll.handle, NULL );
304 if (event->sender->context == &event->context) event->sender->context = NULL;
305 release_object( event->sender );
306 release_object( event->debugger );
309 static void debug_ctx_dump( struct object *obj, int verbose )
311 struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
312 assert( obj->ops == &debug_ctx_ops );
313 fprintf( stderr, "Debug context head=%p tail=%p\n",
314 debug_ctx->event_queue.next, debug_ctx->event_queue.prev );
317 static int debug_ctx_signaled( struct object *obj, struct thread *thread )
319 struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
320 assert( obj->ops == &debug_ctx_ops );
321 return find_event_to_send( debug_ctx ) != NULL;
324 static void debug_ctx_destroy( struct object *obj )
327 struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
328 assert( obj->ops == &debug_ctx_ops );
330 /* free all pending events */
331 while ((ptr = list_head( &debug_ctx->event_queue )))
332 unlink_event( debug_ctx, LIST_ENTRY( ptr, struct debug_event, entry ));
335 /* continue a debug event */
336 static int continue_debug_event( struct process *process, struct thread *thread, int status )
338 struct debug_ctx *debug_ctx = current->debug_ctx;
340 if (debug_ctx && process->debugger == current && thread->process == process)
342 struct debug_event *event;
344 /* find the event in the queue */
345 LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
347 if (event->state != EVENT_SENT) continue;
348 if (event->sender == thread)
350 assert( event->sender->debug_event == event );
352 event->status = status;
353 event->state = EVENT_CONTINUED;
354 wake_up( &event->obj, 0 );
355 unlink_event( debug_ctx, event );
356 resume_process( process );
361 /* not debugging this process, or no such event */
362 set_error( STATUS_ACCESS_DENIED ); /* FIXME */
366 /* alloc a debug event for a debugger */
367 static struct debug_event *alloc_debug_event( struct thread *thread, int code,
368 void *arg, const CONTEXT *context )
370 struct thread *debugger = thread->process->debugger;
371 struct debug_event *event;
373 assert( code > 0 && code <= NB_DEBUG_EVENTS );
374 /* cannot queue a debug event for myself */
375 assert( debugger->process != thread->process );
377 /* build the event */
378 if (!(event = alloc_object( &debug_event_ops ))) return NULL;
379 event->state = EVENT_QUEUED;
380 event->sender = (struct thread *)grab_object( thread );
381 event->debugger = (struct thread *)grab_object( debugger );
382 event->data.code = code;
384 if (!fill_debug_event[code-1]( event, arg ))
386 event->data.code = -1; /* make sure we don't attempt to close handles */
387 release_object( event );
392 memcpy( &event->context, context, sizeof(event->context) );
393 thread->context = &event->context;
398 /* generate a debug event from inside the server and queue it */
399 void generate_debug_event( struct thread *thread, int code, void *arg )
401 if (thread->process->debugger)
403 struct debug_event *event = alloc_debug_event( thread, code, arg, NULL );
407 suspend_process( thread->process );
408 release_object( event );
413 /* attach a process to a debugger thread and suspend it */
414 static int debugger_attach( struct process *process, struct thread *debugger )
416 struct thread *thread;
418 if (process->debugger) goto error; /* already being debugged */
419 if (!is_process_init_done( process )) goto error; /* still starting up */
420 if (list_empty( &process->thread_list )) goto error; /* no thread running in the process */
422 /* make sure we don't create a debugging loop */
423 for (thread = debugger; thread; thread = thread->process->debugger)
424 if (thread->process == process) goto error;
426 /* don't let a debugger debug its console... won't work */
427 if (debugger->process->console && debugger->process->console->renderer->process == process)
430 suspend_process( process );
431 if (!attach_process( process ) || !set_process_debugger( process, debugger ))
433 resume_process( process );
436 if (!set_process_debug_flag( process, 1 ))
438 process->debugger = NULL;
439 resume_process( process );
445 set_error( STATUS_ACCESS_DENIED );
450 /* detach a process from a debugger thread (and resume it ?) */
451 int debugger_detach( struct process *process, struct thread *debugger )
453 struct debug_event *event;
454 struct debug_ctx *debug_ctx;
456 if (!process->debugger || process->debugger != debugger)
457 goto error; /* not currently debugged, or debugged by another debugger */
458 if (!debugger->debug_ctx ) goto error; /* should be a debugger */
459 /* init should be done, otherwise wouldn't be attached */
460 assert(is_process_init_done(process));
462 suspend_process( process );
463 /* send continue indication for all events */
464 debug_ctx = debugger->debug_ctx;
466 /* find the event in the queue
467 * FIXME: could loop on process' threads and look the debug_event field */
468 LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
470 if (event->state != EVENT_QUEUED) continue;
472 if (event->sender->process == process)
474 assert( event->sender->debug_event == event );
475 event->status = DBG_CONTINUE;
476 event->state = EVENT_CONTINUED;
477 wake_up( &event->obj, 0 );
478 unlink_event( debug_ctx, event );
479 /* from queued debug event */
480 resume_process( process );
485 /* remove relationships between process and its debugger */
486 process->debugger = NULL;
487 if (!set_process_debug_flag( process, 0 )) clear_error(); /* ignore error */
488 detach_process( process );
490 /* from this function */
491 resume_process( process );
495 set_error( STATUS_ACCESS_DENIED );
499 /* generate all startup events of a given process */
500 void generate_startup_debug_events( struct process *process, void *entry )
503 struct thread *thread, *first_thread = get_process_first_thread( process );
505 /* generate creation events */
506 LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
508 if (thread == first_thread)
509 generate_debug_event( thread, CREATE_PROCESS_DEBUG_EVENT, entry );
511 generate_debug_event( thread, CREATE_THREAD_DEBUG_EVENT, NULL );
514 /* generate dll events (in loading order, i.e. reverse list order) */
515 ptr = list_tail( &process->dlls );
518 struct process_dll *dll = LIST_ENTRY( ptr, struct process_dll, entry );
519 generate_debug_event( first_thread, LOAD_DLL_DEBUG_EVENT, dll );
520 ptr = list_prev( &process->dlls, ptr );
524 /* set the debugger of a given process */
525 int set_process_debugger( struct process *process, struct thread *debugger )
527 struct debug_ctx *debug_ctx;
529 assert( !process->debugger );
531 if (!debugger->debug_ctx) /* need to allocate a context */
533 if (!(debug_ctx = alloc_object( &debug_ctx_ops ))) return 0;
534 debug_ctx->kill_on_exit = 1;
535 list_init( &debug_ctx->event_queue );
536 debugger->debug_ctx = debug_ctx;
538 process->debugger = debugger;
542 /* a thread is exiting */
543 void debug_exit_thread( struct thread *thread )
545 if (thread->debug_ctx) /* this thread is a debugger */
547 if (thread->debug_ctx->kill_on_exit)
549 /* kill all debugged processes */
550 kill_debugged_processes( thread, thread->exit_code );
554 detach_debugged_processes( thread );
556 release_object( thread->debug_ctx );
557 thread->debug_ctx = NULL;
561 /* Wait for a debug event */
562 DECL_HANDLER(wait_debug_event)
564 struct debug_ctx *debug_ctx = current->debug_ctx;
565 struct debug_event *event;
567 if (!debug_ctx) /* current thread is not a debugger */
569 set_error( STATUS_INVALID_HANDLE );
573 if ((event = find_event_to_send( debug_ctx )))
575 size_t size = get_reply_max_size();
576 event->state = EVENT_SENT;
577 event->sender->debug_event = event;
578 reply->pid = get_process_id( event->sender->process );
579 reply->tid = get_thread_id( event->sender );
580 if (size > sizeof(debug_event_t)) size = sizeof(debug_event_t);
581 set_reply_data( &event->data, size );
583 else /* no event ready */
588 reply->wait = alloc_handle( current->process, debug_ctx, SYNCHRONIZE, 0 );
592 /* Continue a debug event */
593 DECL_HANDLER(continue_debug_event)
595 struct process *process = get_process_from_id( req->pid );
598 struct thread *thread = get_thread_from_id( req->tid );
601 continue_debug_event( process, thread, req->status );
602 release_object( thread );
604 release_object( process );
608 /* Start debugging an existing process */
609 DECL_HANDLER(debug_process)
611 struct process *process = get_process_from_id( req->pid );
612 if (!process) return;
616 debugger_detach( process, current );
618 else if (debugger_attach( process, current ))
620 struct debug_event_exception data;
621 struct thread *thread = get_process_first_thread( process );
623 generate_startup_debug_events( process, NULL );
624 resume_process( process );
626 data.record.ExceptionCode = EXCEPTION_BREAKPOINT;
627 data.record.ExceptionFlags = EXCEPTION_CONTINUABLE;
628 data.record.ExceptionRecord = NULL;
629 data.record.ExceptionAddress = get_thread_ip( thread );
630 data.record.NumberParameters = 0;
632 generate_debug_event( thread, EXCEPTION_DEBUG_EVENT, &data );
634 release_object( process );
637 /* queue an exception event */
638 DECL_HANDLER(queue_exception_event)
641 if (current->process->debugger)
643 struct debug_event_exception data;
644 struct debug_event *event;
645 const CONTEXT *context = get_req_data();
646 const EXCEPTION_RECORD *rec = (const EXCEPTION_RECORD *)(context + 1);
648 if (get_req_data_size() < sizeof(*rec) + sizeof(*context))
650 set_error( STATUS_INVALID_PARAMETER );
654 data.first = req->first;
655 if ((event = alloc_debug_event( current, EXCEPTION_DEBUG_EVENT, &data, context )))
657 if ((reply->handle = alloc_handle( current->process, event, SYNCHRONIZE, 0 )))
660 suspend_process( current->process );
662 release_object( event );
667 /* retrieve the status of an exception event */
668 DECL_HANDLER(get_exception_status)
670 struct debug_event *event;
672 if ((event = (struct debug_event *)get_handle_obj( current->process, req->handle,
673 0, &debug_event_ops )))
675 close_handle( current->process, req->handle, NULL );
676 if (event->state == EVENT_CONTINUED)
678 if (current->context == &event->context)
680 size_t size = min( sizeof(CONTEXT), get_reply_max_size() );
681 set_reply_data( &event->context, size );
682 current->context = NULL;
684 set_error( event->status );
686 else set_error( STATUS_PENDING );
687 release_object( event );
691 /* send an output string to the debugger */
692 DECL_HANDLER(output_debug_string)
694 struct debug_event_output_string data;
696 data.string = req->string;
697 data.unicode = req->unicode;
698 data.length = req->length;
699 generate_debug_event( current, OUTPUT_DEBUG_STRING_EVENT, &data );
702 /* simulate a breakpoint in a process */
703 DECL_HANDLER(debug_break)
705 struct process *process;
708 if (!(process = get_process_from_handle( req->handle, PROCESS_SET_INFORMATION /*FIXME*/ )))
710 if (process != current->process)
712 /* find a suitable thread to signal */
713 struct thread *thread;
714 LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
716 if (send_thread_signal( thread, SIGTRAP )) goto done;
718 set_error( STATUS_ACCESS_DENIED );
720 else reply->self = 1;
723 release_object( process );
726 /* set debugger kill on exit flag */
727 DECL_HANDLER(set_debugger_kill_on_exit)
729 if (!current->debug_ctx)
731 set_error( STATUS_ACCESS_DENIED );
734 current->debug_ctx->kill_on_exit = req->kill_on_exit;