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Sweden-Number/server/debugger.c

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/*
* Server-side debugger functions
*
* Copyright (C) 1999 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <signal.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winternl.h"
#include "handle.h"
#include "process.h"
#include "thread.h"
#include "request.h"
#include "console.h"
enum debug_event_state { EVENT_QUEUED, EVENT_SENT, EVENT_CONTINUED };
/* debug event */
struct debug_event
{
struct object obj; /* object header */
struct list entry; /* entry in event queue */
struct thread *sender; /* thread which sent this event */
struct thread *debugger; /* debugger thread receiving the event */
enum debug_event_state state; /* event state */
int status; /* continuation status */
debug_event_t data; /* event data */
CONTEXT context; /* register context */
};
/* debug context */
struct debug_ctx
{
struct object obj; /* object header */
struct list event_queue; /* pending events queue */
int kill_on_exit;/* kill debuggees on debugger exit ? */
};
static void debug_event_dump( struct object *obj, int verbose );
static int debug_event_signaled( struct object *obj, struct thread *thread );
static void debug_event_destroy( struct object *obj );
static const struct object_ops debug_event_ops =
{
sizeof(struct debug_event), /* size */
debug_event_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
debug_event_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
no_map_access, /* map_access */
no_lookup_name, /* lookup_name */
no_close_handle, /* close_handle */
debug_event_destroy /* destroy */
};
static void debug_ctx_dump( struct object *obj, int verbose );
static int debug_ctx_signaled( struct object *obj, struct thread *thread );
static void debug_ctx_destroy( struct object *obj );
static const struct object_ops debug_ctx_ops =
{
sizeof(struct debug_ctx), /* size */
debug_ctx_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
debug_ctx_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
no_map_access, /* map_access */
no_lookup_name, /* lookup_name */
no_close_handle, /* close_handle */
debug_ctx_destroy /* destroy */
};
/* routines to build an event according to its type */
static int fill_exception_event( struct debug_event *event, void *arg )
{
memcpy( &event->data.info.exception, arg, sizeof(event->data.info.exception) );
return 1;
}
static int fill_create_thread_event( struct debug_event *event, void *arg )
{
struct process *debugger = event->debugger->process;
struct thread *thread = event->sender;
obj_handle_t handle;
/* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 ))) return 0;
event->data.info.create_thread.handle = handle;
event->data.info.create_thread.teb = thread->teb;
event->data.info.create_thread.start = arg;
return 1;
}
static int fill_create_process_event( struct debug_event *event, void *arg )
{
struct process *debugger = event->debugger->process;
struct thread *thread = event->sender;
struct process *process = thread->process;
struct process_dll *exe_module = get_process_exe_module( process );
obj_handle_t handle;
/* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
if (!(handle = alloc_handle( debugger, process, PROCESS_ALL_ACCESS, 0 ))) return 0;
event->data.info.create_process.process = handle;
/* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 )))
{
close_handle( debugger, event->data.info.create_process.process, NULL );
return 0;
}
event->data.info.create_process.thread = handle;
handle = 0;
if (exe_module->file &&
/* the doc says write access too, but this doesn't seem a good idea */
!(handle = alloc_handle( debugger, exe_module->file, GENERIC_READ, 0 )))
{
close_handle( debugger, event->data.info.create_process.process, NULL );
close_handle( debugger, event->data.info.create_process.thread, NULL );
return 0;
}
event->data.info.create_process.file = handle;
event->data.info.create_process.teb = thread->teb;
event->data.info.create_process.base = exe_module->base;
event->data.info.create_process.start = arg;
event->data.info.create_process.dbg_offset = exe_module->dbg_offset;
event->data.info.create_process.dbg_size = exe_module->dbg_size;
event->data.info.create_process.name = exe_module->name;
event->data.info.create_process.unicode = 1;
return 1;
}
static int fill_exit_thread_event( struct debug_event *event, void *arg )
{
struct thread *thread = arg;
event->data.info.exit.exit_code = thread->exit_code;
return 1;
}
static int fill_exit_process_event( struct debug_event *event, void *arg )
{
struct process *process = arg;
event->data.info.exit.exit_code = process->exit_code;
return 1;
}
static int fill_load_dll_event( struct debug_event *event, void *arg )
{
struct process *debugger = event->debugger->process;
struct process_dll *dll = arg;
obj_handle_t handle = 0;
if (dll->file && !(handle = alloc_handle( debugger, dll->file, GENERIC_READ, 0 )))
return 0;
event->data.info.load_dll.handle = handle;
event->data.info.load_dll.base = dll->base;
event->data.info.load_dll.dbg_offset = dll->dbg_offset;
event->data.info.load_dll.dbg_size = dll->dbg_size;
event->data.info.load_dll.name = dll->name;
event->data.info.load_dll.unicode = 1;
return 1;
}
static int fill_unload_dll_event( struct debug_event *event, void *arg )
{
event->data.info.unload_dll.base = arg;
return 1;
}
static int fill_output_debug_string_event( struct debug_event *event, void *arg )
{
struct debug_event_output_string *data = arg;
event->data.info.output_string = *data;
return 1;
}
typedef int (*fill_event_func)( struct debug_event *event, void *arg );
#define NB_DEBUG_EVENTS OUTPUT_DEBUG_STRING_EVENT /* RIP_EVENT not supported */
static const fill_event_func fill_debug_event[NB_DEBUG_EVENTS] =
{
fill_exception_event, /* EXCEPTION_DEBUG_EVENT */
fill_create_thread_event, /* CREATE_THREAD_DEBUG_EVENT */
fill_create_process_event, /* CREATE_PROCESS_DEBUG_EVENT */
fill_exit_thread_event, /* EXIT_THREAD_DEBUG_EVENT */
fill_exit_process_event, /* EXIT_PROCESS_DEBUG_EVENT */
fill_load_dll_event, /* LOAD_DLL_DEBUG_EVENT */
fill_unload_dll_event, /* UNLOAD_DLL_DEBUG_EVENT */
fill_output_debug_string_event /* OUTPUT_DEBUG_STRING_EVENT */
};
/* unlink the first event from the queue */
static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event )
{
list_remove( &event->entry );
if (event->sender->debug_event == event) event->sender->debug_event = NULL;
release_object( event );
}
/* link an event at the end of the queue */
static void link_event( struct debug_event *event )
{
struct debug_ctx *debug_ctx = event->debugger->debug_ctx;
assert( debug_ctx );
grab_object( event );
list_add_tail( &debug_ctx->event_queue, &event->entry );
if (!event->sender->debug_event) wake_up( &debug_ctx->obj, 0 );
}
/* find the next event that we can send to the debugger */
static struct debug_event *find_event_to_send( struct debug_ctx *debug_ctx )
{
struct debug_event *event;
LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
{
if (event->state == EVENT_SENT) continue; /* already sent */
if (event->sender->debug_event) continue; /* thread busy with another one */
return event;
}
return NULL;
}
static void debug_event_dump( struct object *obj, int verbose )
{
struct debug_event *debug_event = (struct debug_event *)obj;
assert( obj->ops == &debug_event_ops );
fprintf( stderr, "Debug event sender=%p code=%d state=%d\n",
debug_event->sender, debug_event->data.code, debug_event->state );
}
static int debug_event_signaled( struct object *obj, struct thread *thread )
{
struct debug_event *debug_event = (struct debug_event *)obj;
assert( obj->ops == &debug_event_ops );
return debug_event->state == EVENT_CONTINUED;
}
static void debug_event_destroy( struct object *obj )
{
struct debug_event *event = (struct debug_event *)obj;
assert( obj->ops == &debug_event_ops );
/* If the event has been sent already, the handles are now under the */
/* responsibility of the debugger process, so we don't touch them */
if (event->state == EVENT_QUEUED)
{
struct process *debugger = event->debugger->process;
switch(event->data.code)
{
case CREATE_THREAD_DEBUG_EVENT:
close_handle( debugger, event->data.info.create_thread.handle, NULL );
break;
case CREATE_PROCESS_DEBUG_EVENT:
if (event->data.info.create_process.file)
close_handle( debugger, event->data.info.create_process.file, NULL );
close_handle( debugger, event->data.info.create_process.thread, NULL );
close_handle( debugger, event->data.info.create_process.process, NULL );
break;
case LOAD_DLL_DEBUG_EVENT:
if (event->data.info.load_dll.handle)
close_handle( debugger, event->data.info.load_dll.handle, NULL );
break;
}
}
if (event->sender->context == &event->context) event->sender->context = NULL;
release_object( event->sender );
release_object( event->debugger );
}
static void debug_ctx_dump( struct object *obj, int verbose )
{
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
assert( obj->ops == &debug_ctx_ops );
fprintf( stderr, "Debug context head=%p tail=%p\n",
debug_ctx->event_queue.next, debug_ctx->event_queue.prev );
}
static int debug_ctx_signaled( struct object *obj, struct thread *thread )
{
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
assert( obj->ops == &debug_ctx_ops );
return find_event_to_send( debug_ctx ) != NULL;
}
static void debug_ctx_destroy( struct object *obj )
{
struct list *ptr;
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
assert( obj->ops == &debug_ctx_ops );
/* free all pending events */
while ((ptr = list_head( &debug_ctx->event_queue )))
unlink_event( debug_ctx, LIST_ENTRY( ptr, struct debug_event, entry ));
}
/* continue a debug event */
static int continue_debug_event( struct process *process, struct thread *thread, int status )
{
struct debug_ctx *debug_ctx = current->debug_ctx;
if (debug_ctx && process->debugger == current && thread->process == process)
{
struct debug_event *event;
/* find the event in the queue */
LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
{
if (event->state != EVENT_SENT) continue;
if (event->sender == thread)
{
assert( event->sender->debug_event == event );
event->status = status;
event->state = EVENT_CONTINUED;
wake_up( &event->obj, 0 );
unlink_event( debug_ctx, event );
resume_process( process );
return 1;
}
}
}
/* not debugging this process, or no such event */
set_error( STATUS_ACCESS_DENIED ); /* FIXME */
return 0;
}
/* alloc a debug event for a debugger */
static struct debug_event *alloc_debug_event( struct thread *thread, int code,
void *arg, const CONTEXT *context )
{
struct thread *debugger = thread->process->debugger;
struct debug_event *event;
assert( code > 0 && code <= NB_DEBUG_EVENTS );
/* cannot queue a debug event for myself */
assert( debugger->process != thread->process );
/* build the event */
if (!(event = alloc_object( &debug_event_ops ))) return NULL;
event->state = EVENT_QUEUED;
event->sender = (struct thread *)grab_object( thread );
event->debugger = (struct thread *)grab_object( debugger );
event->data.code = code;
if (!fill_debug_event[code-1]( event, arg ))
{
event->data.code = -1; /* make sure we don't attempt to close handles */
release_object( event );
return NULL;
}
if (context)
{
memcpy( &event->context, context, sizeof(event->context) );
thread->context = &event->context;
}
return event;
}
/* generate a debug event from inside the server and queue it */
void generate_debug_event( struct thread *thread, int code, void *arg )
{
if (thread->process->debugger)
{
struct debug_event *event = alloc_debug_event( thread, code, arg, NULL );
if (event)
{
link_event( event );
suspend_process( thread->process );
release_object( event );
}
}
}
/* attach a process to a debugger thread and suspend it */
static int debugger_attach( struct process *process, struct thread *debugger )
{
struct thread *thread;
if (process->debugger) goto error; /* already being debugged */
if (!is_process_init_done( process )) goto error; /* still starting up */
if (list_empty( &process->thread_list )) goto error; /* no thread running in the process */
/* make sure we don't create a debugging loop */
for (thread = debugger; thread; thread = thread->process->debugger)
if (thread->process == process) goto error;
/* don't let a debugger debug its console... won't work */
if (debugger->process->console && debugger->process->console->renderer->process == process)
goto error;
suspend_process( process );
if (!set_process_debugger( process, debugger ))
{
resume_process( process );
return 0;
}
if (!set_process_debug_flag( process, 1 ))
{
process->debugger = NULL;
resume_process( process );
return 0;
}
return 1;
error:
set_error( STATUS_ACCESS_DENIED );
return 0;
}
/* detach a process from a debugger thread (and resume it ?) */
int debugger_detach( struct process *process, struct thread *debugger )
{
struct debug_event *event;
struct debug_ctx *debug_ctx;
if (!process->debugger || process->debugger != debugger)
goto error; /* not currently debugged, or debugged by another debugger */
if (!debugger->debug_ctx ) goto error; /* should be a debugger */
/* init should be done, otherwise wouldn't be attached */
assert(is_process_init_done(process));
suspend_process( process );
/* send continue indication for all events */
debug_ctx = debugger->debug_ctx;
/* find the event in the queue
* FIXME: could loop on process' threads and look the debug_event field */
LIST_FOR_EACH_ENTRY( event, &debug_ctx->event_queue, struct debug_event, entry )
{
if (event->state != EVENT_QUEUED) continue;
if (event->sender->process == process)
{
assert( event->sender->debug_event == event );
event->status = DBG_CONTINUE;
event->state = EVENT_CONTINUED;
wake_up( &event->obj, 0 );
unlink_event( debug_ctx, event );
/* from queued debug event */
resume_process( process );
break;
}
}
/* remove relationships between process and its debugger */
process->debugger = NULL;
if (!set_process_debug_flag( process, 0 )) clear_error(); /* ignore error */
/* from this function */
resume_process( process );
return 0;
error:
set_error( STATUS_ACCESS_DENIED );
return 0;
}
/* generate all startup events of a given process */
void generate_startup_debug_events( struct process *process, void *entry )
{
struct list *ptr;
struct thread *thread, *first_thread = get_process_first_thread( process );
/* generate creation events */
LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
{
if (thread == first_thread)
generate_debug_event( thread, CREATE_PROCESS_DEBUG_EVENT, entry );
else
generate_debug_event( thread, CREATE_THREAD_DEBUG_EVENT, NULL );
}
/* generate dll events (in loading order, i.e. reverse list order) */
ptr = list_tail( &process->dlls );
while (ptr)
{
struct process_dll *dll = LIST_ENTRY( ptr, struct process_dll, entry );
generate_debug_event( first_thread, LOAD_DLL_DEBUG_EVENT, dll );
ptr = list_prev( &process->dlls, ptr );
}
}
/* set the debugger of a given process */
int set_process_debugger( struct process *process, struct thread *debugger )
{
struct debug_ctx *debug_ctx;
assert( !process->debugger );
if (!debugger->debug_ctx) /* need to allocate a context */
{
if (!(debug_ctx = alloc_object( &debug_ctx_ops ))) return 0;
debug_ctx->kill_on_exit = 1;
list_init( &debug_ctx->event_queue );
debugger->debug_ctx = debug_ctx;
}
process->debugger = debugger;
return 1;
}
/* a thread is exiting */
void debug_exit_thread( struct thread *thread )
{
if (thread->debug_ctx) /* this thread is a debugger */
{
if (thread->debug_ctx->kill_on_exit)
{
/* kill all debugged processes */
kill_debugged_processes( thread, thread->exit_code );
}
else
{
detach_debugged_processes( thread );
}
release_object( thread->debug_ctx );
thread->debug_ctx = NULL;
}
}
/* Wait for a debug event */
DECL_HANDLER(wait_debug_event)
{
struct debug_ctx *debug_ctx = current->debug_ctx;
struct debug_event *event;
if (!debug_ctx) /* current thread is not a debugger */
{
set_error( STATUS_INVALID_HANDLE );
return;
}
reply->wait = 0;
if ((event = find_event_to_send( debug_ctx )))
{
size_t size = get_reply_max_size();
event->state = EVENT_SENT;
event->sender->debug_event = event;
reply->pid = get_process_id( event->sender->process );
reply->tid = get_thread_id( event->sender );
if (size > sizeof(debug_event_t)) size = sizeof(debug_event_t);
set_reply_data( &event->data, size );
}
else /* no event ready */
{
reply->pid = 0;
reply->tid = 0;
if (req->get_handle)
reply->wait = alloc_handle( current->process, debug_ctx, SYNCHRONIZE, 0 );
}
}
/* Continue a debug event */
DECL_HANDLER(continue_debug_event)
{
struct process *process = get_process_from_id( req->pid );
if (process)
{
struct thread *thread = get_thread_from_id( req->tid );
if (thread)
{
continue_debug_event( process, thread, req->status );
release_object( thread );
}
release_object( process );
}
}
/* Start debugging an existing process */
DECL_HANDLER(debug_process)
{
struct process *process = get_process_from_id( req->pid );
if (!process) return;
if (!req->attach)
{
debugger_detach( process, current );
}
else if (debugger_attach( process, current ))
{
struct debug_event_exception data;
struct thread *thread = get_process_first_thread( process );
generate_startup_debug_events( process, NULL );
resume_process( process );
data.record.ExceptionCode = EXCEPTION_BREAKPOINT;
data.record.ExceptionFlags = EXCEPTION_CONTINUABLE;
data.record.ExceptionRecord = NULL;
data.record.ExceptionAddress = get_thread_ip( thread );
data.record.NumberParameters = 0;
data.first = 1;
generate_debug_event( thread, EXCEPTION_DEBUG_EVENT, &data );
}
release_object( process );
}
/* queue an exception event */
DECL_HANDLER(queue_exception_event)
{
reply->handle = 0;
if (current->process->debugger)
{
struct debug_event_exception data;
struct debug_event *event;
const CONTEXT *context = get_req_data();
const EXCEPTION_RECORD *rec = (const EXCEPTION_RECORD *)(context + 1);
if (get_req_data_size() < sizeof(*rec) + sizeof(*context))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
data.record = *rec;
data.first = req->first;
if ((event = alloc_debug_event( current, EXCEPTION_DEBUG_EVENT, &data, context )))
{
if ((reply->handle = alloc_handle( current->process, event, SYNCHRONIZE, 0 )))
{
link_event( event );
suspend_process( current->process );
}
release_object( event );
}
}
}
/* retrieve the status of an exception event */
DECL_HANDLER(get_exception_status)
{
struct debug_event *event;
if ((event = (struct debug_event *)get_handle_obj( current->process, req->handle,
0, &debug_event_ops )))
{
close_handle( current->process, req->handle, NULL );
if (event->state == EVENT_CONTINUED)
{
if (current->context == &event->context)
{
size_t size = min( sizeof(CONTEXT), get_reply_max_size() );
set_reply_data( &event->context, size );
current->context = NULL;
}
set_error( event->status );
}
else set_error( STATUS_PENDING );
release_object( event );
}
}
/* send an output string to the debugger */
DECL_HANDLER(output_debug_string)
{
struct debug_event_output_string data;
data.string = req->string;
data.unicode = req->unicode;
data.length = req->length;
generate_debug_event( current, OUTPUT_DEBUG_STRING_EVENT, &data );
}
/* simulate a breakpoint in a process */
DECL_HANDLER(debug_break)
{
struct process *process;
reply->self = 0;
if (!(process = get_process_from_handle( req->handle, PROCESS_SET_INFORMATION /*FIXME*/ )))
return;
if (process != current->process)
{
/* find a suitable thread to signal */
struct thread *thread;
LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
{
if (send_thread_signal( thread, SIGTRAP )) goto done;
}
set_error( STATUS_ACCESS_DENIED );
}
else reply->self = 1;
done:
release_object( process );
}
/* set debugger kill on exit flag */
DECL_HANDLER(set_debugger_kill_on_exit)
{
if (!current->debug_ctx)
{
set_error( STATUS_ACCESS_DENIED );
return;
}
current->debug_ctx->kill_on_exit = req->kill_on_exit;
}
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