Sweden-Number/server/debugger.c

497 lines
17 KiB
C

/*
* Server-side debugger functions
*
* Copyright (C) 1999 Alexandre Julliard
*/
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include "winbase.h"
#include "handle.h"
#include "process.h"
#include "thread.h"
#include "request.h"
enum debug_event_state { EVENT_QUEUED, EVENT_SENT, EVENT_CONTINUED };
/* debug event */
struct debug_event
{
struct object obj; /* object header */
struct debug_event *next; /* event queue */
struct debug_event *prev;
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 */
};
/* debug context */
struct debug_ctx
{
struct object obj; /* object header */
struct debug_event *event_head; /* head of pending events queue */
struct debug_event *event_tail; /* tail of pending events queue */
struct debug_event *to_send; /* next event on the queue to send to debugger */
};
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 */
NULL, /* get_poll_events */
NULL, /* poll_event */
no_read_fd, /* get_read_fd */
no_write_fd, /* get_write_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
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 */
NULL, /* get_poll_events */
NULL, /* poll_event */
no_read_fd, /* get_read_fd */
no_write_fd, /* get_write_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
debug_ctx_destroy /* destroy */
};
/* initialise the fields that do not need to be filled by the client */
static int fill_debug_event( struct thread *debugger, struct thread *thread,
struct debug_event *event )
{
int handle;
/* some events need special handling */
switch(event->data.code)
{
case CREATE_THREAD_DEBUG_EVENT:
if ((event->data.info.create_thread.handle = alloc_handle( debugger->process, thread,
/* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
THREAD_ALL_ACCESS, FALSE )) == -1)
return 0;
break;
case CREATE_PROCESS_DEBUG_EVENT:
if ((handle = event->data.info.create_process.file) != -1)
{
if ((handle = duplicate_handle( thread->process, handle, debugger->process,
GENERIC_READ, FALSE, 0 )) == -1)
return 0;
event->data.info.create_process.file = handle;
}
if ((event->data.info.create_process.process = alloc_handle( debugger->process, thread->process,
/* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
PROCESS_ALL_ACCESS, FALSE )) == -1)
{
if (handle != -1) close_handle( debugger->process, handle );
return 0;
}
if ((event->data.info.create_process.thread = alloc_handle( debugger->process, thread,
/* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
THREAD_ALL_ACCESS, FALSE )) == -1)
{
if (handle != -1) close_handle( debugger->process, handle );
close_handle( debugger->process, event->data.info.create_process.process );
return 0;
}
break;
case LOAD_DLL_DEBUG_EVENT:
if ((handle = event->data.info.load_dll.handle) != -1)
{
if ((handle = duplicate_handle( thread->process, handle, debugger->process,
GENERIC_READ, FALSE, 0 )) == -1)
return 0;
event->data.info.load_dll.handle = handle;
}
break;
}
return 1;
}
/* unlink the first event from the queue */
static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event )
{
if (event->prev) event->prev->next = event->next;
else debug_ctx->event_head = event->next;
if (event->next) event->next->prev = event->prev;
else debug_ctx->event_tail = event->prev;
if (debug_ctx->to_send == event) debug_ctx->to_send = event->next;
event->next = event->prev = NULL;
release_object( event );
}
/* link an event at the end of the queue */
static void link_event( struct debug_ctx *debug_ctx, struct debug_event *event )
{
grab_object( event );
event->next = NULL;
event->prev = debug_ctx->event_tail;
debug_ctx->event_tail = event;
if (event->prev) event->prev->next = event;
else debug_ctx->event_head = event;
if (!debug_ctx->to_send)
{
debug_ctx->to_send = event;
wake_up( &debug_ctx->obj, 0 );
}
}
/* build a reply for the wait_debug_event request */
static void build_wait_debug_reply( struct thread *thread, struct object *obj, int signaled )
{
struct wait_debug_event_request *req = get_req_ptr( thread );
if (obj)
{
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
struct debug_event *event = debug_ctx->to_send;
/* the object that woke us has to be our debug context */
assert( obj->ops == &debug_ctx_ops );
assert( event );
event->state = EVENT_SENT;
debug_ctx->to_send = event->next;
req->event.code = event->data.code;
req->pid = event->sender->process;
req->tid = event->sender;
memcpy( &req->event, &event->data, sizeof(req->event) );
}
else /* timeout or error */
{
req->event.code = 0;
req->pid = 0;
req->tid = 0;
thread->error = signaled;
}
}
/* build a reply for the send_event request */
static void build_send_event_reply( struct thread *thread, struct object *obj, int signaled )
{
struct send_debug_event_request *req = get_req_ptr( thread );
struct debug_event *event = (struct debug_event *)obj;
assert( obj->ops == &debug_event_ops );
req->status = event->status;
/* copy the context into the reply */
if (event->data.code == EXCEPTION_DEBUG_EVENT)
memcpy( &req->event.info.exception.context,
&event->data.info.exception.context,
sizeof(req->event.info.exception.context) );
}
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 );
/* cannot still be in the queue */
assert( !event->next );
assert( !event->prev );
/* 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 );
break;
case CREATE_PROCESS_DEBUG_EVENT:
if (event->data.info.create_process.file != -1)
close_handle( debugger, event->data.info.create_process.file );
close_handle( debugger, event->data.info.create_process.thread );
close_handle( debugger, event->data.info.create_process.process );
break;
case LOAD_DLL_DEBUG_EVENT:
if (event->data.info.load_dll.handle != -1)
close_handle( debugger, event->data.info.load_dll.handle );
break;
}
}
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 to_send=%p\n",
debug_ctx->event_head, debug_ctx->event_tail, debug_ctx->to_send );
}
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 debug_ctx->to_send != NULL;
}
static void debug_ctx_destroy( struct object *obj )
{
struct debug_event *event;
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
assert( obj->ops == &debug_ctx_ops );
/* free all pending events */
while ((event = debug_ctx->event_head) != NULL) unlink_event( debug_ctx, event );
}
/* wait for a debug event (or send a reply at once if one is pending) */
static int wait_for_debug_event( int timeout )
{
struct debug_ctx *debug_ctx = current->debug_ctx;
struct object *obj = &debug_ctx->obj;
int flags = 0;
if (!debug_ctx) /* current thread is not a debugger */
{
set_error( STATUS_INVALID_HANDLE );
return 0;
}
if (timeout != -1) flags = SELECT_TIMEOUT;
return sleep_on( 1, &obj, flags, timeout, build_wait_debug_reply );
}
/* continue a debug event */
static int continue_debug_event( struct process *process, struct thread *thread, int status )
{
struct debug_event *event;
struct debug_ctx *debug_ctx = current->debug_ctx;
if (!debug_ctx || process->debugger != current || thread->process != process) goto error;
/* find the event in the queue */
for (event = debug_ctx->event_head; event; event = event->next)
{
if (event == debug_ctx->to_send) goto error;
if (event->sender == thread) break;
event = event->next;
}
if (!event) goto error;
event->status = status;
event->state = EVENT_CONTINUED;
wake_up( &event->obj, 0 );
unlink_event( debug_ctx, event );
resume_process( process );
return 1;
error:
/* not debugging this process, or no such event */
set_error( STATUS_ACCESS_DENIED ); /* FIXME */
return 0;
}
/* queue a debug event for a debugger */
static struct debug_event *queue_debug_event( struct thread *debugger, struct thread *thread,
debug_event_t *data )
{
struct debug_ctx *debug_ctx = debugger->debug_ctx;
struct debug_event *event;
assert( debug_ctx );
/* cannot queue a debug event for myself */
assert( debugger->process != thread->process );
/* build the event */
if (!(event = alloc_object( &debug_event_ops, -1 ))) return NULL;
event->next = NULL;
event->prev = NULL;
event->state = EVENT_QUEUED;
event->sender = (struct thread *)grab_object( thread );
event->debugger = (struct thread *)grab_object( debugger );
memcpy( &event->data, data, sizeof(event->data) );
if (!fill_debug_event( debugger, thread, event ))
{
event->data.code = -1; /* make sure we don't attempt to close handles */
release_object( event );
return NULL;
}
link_event( debug_ctx, event );
suspend_process( thread->process );
return event;
}
/* return a pointer to the context in case the thread is inside an exception event */
CONTEXT *get_debug_context( struct thread *thread )
{
struct debug_event *event;
struct thread *debugger = thread->process->debugger;
if (!debugger) return NULL; /* not being debugged */
assert( debugger->debug_ctx );
/* find the exception event in the debugger's queue */
for (event = debugger->debug_ctx->event_head; event; event = event->next)
if (event->sender == thread && (event->data.code == EXCEPTION_DEBUG_EVENT))
return &event->data.info.exception.context;
return NULL;
}
/* attach a process to a debugger thread */
int debugger_attach( struct process *process, struct thread *debugger )
{
struct debug_ctx *debug_ctx;
struct thread *thread;
if (process->debugger) /* already being debugged */
{
set_error( STATUS_ACCESS_DENIED );
return 0;
}
/* make sure we don't create a debugging loop */
for (thread = debugger; thread; thread = thread->process->debugger)
if (thread->process == process)
{
set_error( STATUS_ACCESS_DENIED );
return 0;
}
if (!debugger->debug_ctx) /* need to allocate a context */
{
if (!(debug_ctx = alloc_object( &debug_ctx_ops, -1 ))) return 0;
debug_ctx->event_head = NULL;
debug_ctx->event_tail = NULL;
debug_ctx->to_send = NULL;
debugger->debug_ctx = debug_ctx;
}
process->debugger = debugger;
return 1;
}
/* a thread is exiting */
void debug_exit_thread( struct thread *thread, int exit_code )
{
struct thread *debugger = thread->process->debugger;
struct debug_ctx *debug_ctx = thread->debug_ctx;
if (debugger) /* being debugged -> send an event to the debugger */
{
struct debug_event *event;
debug_event_t exit;
exit.info.exit.exit_code = exit_code;
/* if this is the last thread, send an exit process event */
exit.code = ((thread->process->running_threads == 1) ?
EXIT_PROCESS_DEBUG_EVENT : EXIT_THREAD_DEBUG_EVENT);
event = queue_debug_event( debugger, thread, &exit );
if (event) release_object( event );
}
if (debug_ctx) /* this thread is a debugger */
{
/* kill all debugged processes */
kill_debugged_processes( thread, exit_code );
thread->debug_ctx = NULL;
release_object( debug_ctx );
}
}
/* Wait for a debug event */
DECL_HANDLER(wait_debug_event)
{
if (!wait_for_debug_event( req->timeout ))
{
req->event.code = 0;
req->pid = NULL;
req->tid = NULL;
}
}
/* 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)
{
debugger_attach( process, current );
/* FIXME: should notify the debugged process somehow */
release_object( process );
}
}
/* Send a debug event */
DECL_HANDLER(send_debug_event)
{
struct thread *debugger = current->process->debugger;
struct debug_event *event;
if ((req->event.code <= 0) || (req->event.code > RIP_EVENT))
{
fatal_protocol_error( current, "send_debug_event: bad code %d\n", req->event.code );
return;
}
req->status = 0;
if (debugger && ((event = queue_debug_event( debugger, current, &req->event ))))
{
/* wait for continue_debug_event */
struct object *obj = &event->obj;
sleep_on( 1, &obj, 0, -1, build_send_event_reply );
release_object( event );
}
}