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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.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 "file.h"
#include "process.h"
#include "thread.h"
#include "request.h"
enum debug_event_state { EVENT_QUEUED, EVENT_SENT, EVENT_DELAYED, 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 file *file; /* file object for events that need one */
enum debug_event_state state; /* event state */
int status; /* continuation status */
debug_event_t data; /* event data */
};
static const WCHAR debug_obj_name[] = {'D','e','b','u','g','O','b','j','e','c','t'};
struct type_descr debug_obj_type =
{
{ debug_obj_name, sizeof(debug_obj_name) }, /* name */
DEBUG_ALL_ACCESS | SYNCHRONIZE, /* valid_access */
{ /* mapping */
STANDARD_RIGHTS_READ | DEBUG_READ_EVENT,
STANDARD_RIGHTS_WRITE | DEBUG_PROCESS_ASSIGN,
STANDARD_RIGHTS_EXECUTE | SYNCHRONIZE,
DEBUG_ALL_ACCESS
},
};
/* debug object */
struct debug_obj
{
struct object obj; /* object header */
struct list event_queue; /* pending events queue */
unsigned int flags; /* debug flags */
};
static void debug_event_dump( struct object *obj, int verbose );
static int debug_event_signaled( struct object *obj, struct wait_queue_entry *entry );
static void debug_event_destroy( struct object *obj );
static const struct object_ops debug_event_ops =
{
sizeof(struct debug_event), /* size */
&no_type, /* type */
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 */
default_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_get_full_name, /* get_full_name */
no_lookup_name, /* lookup_name */
no_link_name, /* link_name */
NULL, /* unlink_name */
no_open_file, /* open_file */
no_kernel_obj_list, /* get_kernel_obj_list */
no_close_handle, /* close_handle */
debug_event_destroy /* destroy */
};
static void debug_obj_dump( struct object *obj, int verbose );
static int debug_obj_signaled( struct object *obj, struct wait_queue_entry *entry );
static void debug_obj_destroy( struct object *obj );
static const struct object_ops debug_obj_ops =
{
sizeof(struct debug_obj), /* size */
&debug_obj_type, /* type */
debug_obj_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
debug_obj_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
default_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
default_get_full_name, /* get_full_name */
no_lookup_name, /* lookup_name */
directory_link_name, /* link_name */
default_unlink_name, /* unlink_name */
no_open_file, /* open_file */
no_kernel_obj_list, /* get_kernel_obj_list */
no_close_handle, /* close_handle */
debug_obj_destroy /* destroy */
};
/* get a pointer to TEB->ArbitraryUserPointer in the client address space */
static client_ptr_t get_teb_user_ptr( struct thread *thread )
{
unsigned int ptr_size = is_machine_64bit( native_machine ) ? 8 : 4;
return thread->teb + 5 * ptr_size;
}
/* routines to build an event according to its type */
static void fill_exception_event( struct debug_event *event, const void *arg )
{
const debug_event_t *data = arg;
event->data.exception = data->exception;
event->data.exception.nb_params = min( event->data.exception.nb_params, EXCEPTION_MAXIMUM_PARAMETERS );
}
static void fill_create_thread_event( struct debug_event *event, const void *arg )
{
const client_ptr_t *entry = arg;
if (entry) event->data.create_thread.start = *entry;
}
static void fill_create_process_event( struct debug_event *event, const void *arg )
{
const struct memory_view *view = arg;
const pe_image_info_t *image_info = get_view_image_info( view, &event->data.create_process.base );
event->data.create_process.start = event->data.create_process.base + image_info->entry_point;
event->data.create_process.dbg_offset = image_info->dbg_offset;
event->data.create_process.dbg_size = image_info->dbg_size;
/* the doc says write access too, but this doesn't seem a good idea */
event->file = get_view_file( view, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE );
}
static void fill_exit_thread_event( struct debug_event *event, const void *arg )
{
const struct thread *thread = arg;
event->data.exit.exit_code = thread->exit_code;
}
static void fill_exit_process_event( struct debug_event *event, const void *arg )
{
const struct process *process = arg;
event->data.exit.exit_code = process->exit_code;
}
static void fill_load_dll_event( struct debug_event *event, const void *arg )
{
const struct memory_view *view = arg;
const pe_image_info_t *image_info = get_view_image_info( view, &event->data.load_dll.base );
event->data.load_dll.dbg_offset = image_info->dbg_offset;
event->data.load_dll.dbg_size = image_info->dbg_size;
event->data.load_dll.name = get_teb_user_ptr( event->sender );
event->file = get_view_file( view, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE );
}
static void fill_unload_dll_event( struct debug_event *event, const void *arg )
{
const struct memory_view *view = arg;
get_view_image_info( view, &event->data.unload_dll.base );
}
typedef void (*fill_event_func)( struct debug_event *event, const void *arg );
static const fill_event_func fill_debug_event[] =
{
fill_create_thread_event, /* DbgCreateThreadStateChange */
fill_create_process_event, /* DbgCreateProcessStateChange */
fill_exit_thread_event, /* DbgExitThreadStateChange */
fill_exit_process_event, /* DbgExitProcessStateChange */
fill_exception_event, /* DbgExceptionStateChange */
fill_exception_event, /* DbgBreakpointStateChange */
fill_exception_event, /* DbgSingleStepStateChange */
fill_load_dll_event, /* DbgLoadDllStateChange */
fill_unload_dll_event /* DbgUnloadDllStateChange */
};
/* allocate the necessary handles in the event data */
static void alloc_event_handles( struct debug_event *event, struct process *process )
{
switch (event->data.code)
{
case DbgCreateThreadStateChange:
/* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
event->data.create_thread.handle = alloc_handle( process, event->sender, THREAD_ALL_ACCESS, 0 );
break;
case DbgCreateProcessStateChange:
event->data.create_process.thread = alloc_handle( process, event->sender, THREAD_ALL_ACCESS, 0 );
/* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
event->data.create_process.process = alloc_handle( process, event->sender->process,
PROCESS_ALL_ACCESS, 0 );
if (event->file)
event->data.create_process.file = alloc_handle( process, event->file, GENERIC_READ, 0 );
break;
case DbgLoadDllStateChange:
if (event->file)
event->data.load_dll.handle = alloc_handle( process, event->file, GENERIC_READ, 0 );
break;
}
clear_error(); /* ignore errors, simply set handles to 0 */
}
/* unlink the first event from the queue */
static void unlink_event( struct debug_obj *debug_obj, struct debug_event *event )
{
list_remove( &event->entry );
if (event->sender->process->debug_event == event) event->sender->process->debug_event = NULL;
release_object( event );
}
/* link an event at the end of the queue */
static void link_event( struct debug_obj *debug_obj, struct debug_event *event )
{
grab_object( event );
list_add_tail( &debug_obj->event_queue, &event->entry );
if (!event->sender->process->debug_event)
{
/* grab reference since debugger could be killed while trying to wake up */
grab_object( debug_obj );
wake_up( &debug_obj->obj, 0 );
release_object( debug_obj );
}
}
/* resume a delayed debug event already in the queue */
static void resume_event( struct debug_obj *debug_obj, struct debug_event *event )
{
event->state = EVENT_QUEUED;
if (!event->sender->process->debug_event)
{
grab_object( debug_obj );
wake_up( &debug_obj->obj, 0 );
release_object( debug_obj );
}
}
/* delay a debug event already in the queue to be replayed when thread wakes up */
static void delay_event( struct debug_obj *debug_obj, struct debug_event *event )
{
event->state = EVENT_DELAYED;
if (event->sender->process->debug_event == event) event->sender->process->debug_event = NULL;
}
/* find the next event that we can send to the debugger */
static struct debug_event *find_event_to_send( struct debug_obj *debug_obj )
{
struct debug_event *event;
LIST_FOR_EACH_ENTRY( event, &debug_obj->event_queue, struct debug_event, entry )
{
if (event->state == EVENT_SENT) continue; /* already sent */
if (event->state == EVENT_DELAYED) continue; /* delayed until thread resumes */
if (event->sender->process->debug_event) continue; /* process 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 wait_queue_entry *entry )
{
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 (event->file) release_object( event->file );
release_object( event->sender );
}
static void debug_obj_dump( struct object *obj, int verbose )
{
struct debug_obj *debug_obj = (struct debug_obj *)obj;
assert( obj->ops == &debug_obj_ops );
fprintf( stderr, "Debug context head=%p tail=%p\n",
debug_obj->event_queue.next, debug_obj->event_queue.prev );
}
static int debug_obj_signaled( struct object *obj, struct wait_queue_entry *entry )
{
struct debug_obj *debug_obj = (struct debug_obj *)obj;
assert( obj->ops == &debug_obj_ops );
return find_event_to_send( debug_obj ) != NULL;
}
static void debug_obj_destroy( struct object *obj )
{
struct list *ptr;
struct debug_obj *debug_obj = (struct debug_obj *)obj;
assert( obj->ops == &debug_obj_ops );
detach_debugged_processes( debug_obj,
(debug_obj->flags & DEBUG_KILL_ON_CLOSE) ? STATUS_DEBUGGER_INACTIVE : 0 );
/* free all pending events */
while ((ptr = list_head( &debug_obj->event_queue )))
unlink_event( debug_obj, LIST_ENTRY( ptr, struct debug_event, entry ));
}
struct debug_obj *get_debug_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct debug_obj *)get_handle_obj( process, handle, access, &debug_obj_ops );
}
static struct debug_obj *create_debug_obj( struct object *root, const struct unicode_str *name,
unsigned int attr, unsigned int flags,
const struct security_descriptor *sd )
{
struct debug_obj *debug_obj;
if ((debug_obj = create_named_object( root, &debug_obj_ops, name, attr, sd )))
{
if (get_error() != STATUS_OBJECT_NAME_EXISTS)
{
debug_obj->flags = flags;
list_init( &debug_obj->event_queue );
}
}
return debug_obj;
}
/* continue a debug event */
static int continue_debug_event( struct debug_obj *debug_obj, struct process *process,
struct thread *thread, int status )
{
if (process->debug_obj == debug_obj && thread->process == process)
{
struct debug_event *event;
if (status == DBG_REPLY_LATER)
{
/* if thread is suspended, delay all its events and resume process
* if not, reset the event for immediate replay */
LIST_FOR_EACH_ENTRY( event, &debug_obj->event_queue, struct debug_event, entry )
{
if (event->sender != thread) continue;
if (thread->suspend)
{
delay_event( debug_obj, event );
resume_process( process );
}
else if (event->state == EVENT_SENT)
{
assert( event->sender->process->debug_event == event );
event->sender->process->debug_event = NULL;
resume_event( debug_obj, event );
return 1;
}
}
return 1;
}
/* find the event in the queue */
LIST_FOR_EACH_ENTRY( event, &debug_obj->event_queue, struct debug_event, entry )
{
if (event->state != EVENT_SENT) continue;
if (event->sender == thread)
{
assert( event->sender->process->debug_event == event );
event->status = status;
event->state = EVENT_CONTINUED;
wake_up( &event->obj, 0 );
unlink_event( debug_obj, 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, const void *arg )
{
struct debug_event *event;
assert( code >= DbgCreateThreadStateChange && code <= DbgUnloadDllStateChange );
/* build the event */
if (!(event = alloc_object( &debug_event_ops ))) return NULL;
event->state = EVENT_QUEUED;
event->sender = (struct thread *)grab_object( thread );
event->file = NULL;
memset( &event->data, 0, sizeof(event->data) );
fill_debug_event[code - DbgCreateThreadStateChange]( event, arg );
event->data.code = code;
return event;
}
/* generate a debug event from inside the server and queue it */
void generate_debug_event( struct thread *thread, int code, const void *arg )
{
struct debug_obj *debug_obj = thread->process->debug_obj;
if (debug_obj)
{
struct debug_event *event = alloc_debug_event( thread, code, arg );
if (event)
{
link_event( debug_obj, event );
suspend_process( thread->process );
release_object( event );
}
clear_error(); /* ignore errors */
}
}
void resume_delayed_debug_events( struct thread *thread )
{
struct debug_obj *debug_obj = thread->process->debug_obj;
struct debug_event *event;
if (debug_obj)
{
LIST_FOR_EACH_ENTRY( event, &debug_obj->event_queue, struct debug_event, entry )
{
if (event->sender != thread) continue;
if (event->state != EVENT_DELAYED) continue;
resume_event( debug_obj, event );
suspend_process( thread->process );
}
}
}
/* attach a process to a debugger thread and suspend it */
static int debugger_attach( struct process *process, struct thread *debugger, struct debug_obj *debug_obj )
{
if (debugger->process == process) goto error;
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 */
/* don't let a debugger debug its console... won't work */
if (debugger->process->console)
{
struct thread *renderer = console_get_renderer(debugger->process->console);
if (renderer && renderer->process == process) goto error;
}
suspend_process( process );
if (!set_process_debug_flag( process, 1 ))
{
resume_process( process );
return 0;
}
process->debug_obj = debug_obj;
process->debug_children = 0;
generate_startup_debug_events( process );
resume_process( process );
return 1;
error:
set_error( STATUS_ACCESS_DENIED );
return 0;
}
/* detach a process from a debugger thread (and resume it) */
void debugger_detach( struct process *process, struct debug_obj *debug_obj )
{
struct debug_event *event, *next;
suspend_process( process );
/* send continue indication for all events */
LIST_FOR_EACH_ENTRY_SAFE( event, next, &debug_obj->event_queue, struct debug_event, entry )
{
if (event->sender->process != process) continue;
assert( event->state != EVENT_CONTINUED );
event->status = DBG_CONTINUE;
event->state = EVENT_CONTINUED;
wake_up( &event->obj, 0 );
unlink_event( debug_obj, event );
/* from queued debug event */
resume_process( process );
}
/* remove relationships between process and its debugger */
process->debug_obj = NULL;
if (!set_process_debug_flag( process, 0 )) clear_error(); /* ignore error */
resume_process( process );
}
/* create a debug object */
DECL_HANDLER(create_debug_obj)
{
struct debug_obj *debug_obj;
struct unicode_str name;
struct object *root;
const struct security_descriptor *sd;
const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );
if (!objattr) return;
if ((debug_obj = create_debug_obj( root, &name, objattr->attributes, req->flags, sd )))
{
if (get_error() == STATUS_OBJECT_NAME_EXISTS)
reply->handle = alloc_handle( current->process, debug_obj, req->access, objattr->attributes );
else
reply->handle = alloc_handle_no_access_check( current->process, debug_obj,
req->access, objattr->attributes );
release_object( debug_obj );
}
if (root) release_object( root );
}
/* Wait for a debug event */
DECL_HANDLER(wait_debug_event)
{
struct debug_obj *debug_obj;
struct debug_event *event;
if (!(debug_obj = get_debug_obj( current->process, req->debug, DEBUG_READ_EVENT ))) return;
if ((event = find_event_to_send( debug_obj )))
{
event->state = EVENT_SENT;
event->sender->process->debug_event = event;
reply->pid = get_process_id( event->sender->process );
reply->tid = get_thread_id( event->sender );
alloc_event_handles( event, current->process );
set_reply_data( &event->data, min( get_reply_max_size(), sizeof(event->data) ));
}
else
{
int state = list_empty( &debug_obj->event_queue ) ? DbgIdle : DbgReplyPending;
set_reply_data( &state, min( get_reply_max_size(), sizeof(state) ));
}
release_object( debug_obj );
}
/* Continue a debug event */
DECL_HANDLER(continue_debug_event)
{
struct debug_obj *debug_obj;
struct process *process;
if (req->status != DBG_EXCEPTION_NOT_HANDLED &&
req->status != DBG_EXCEPTION_HANDLED &&
req->status != DBG_CONTINUE &&
req->status != DBG_REPLY_LATER)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!(debug_obj = get_debug_obj( current->process, req->debug, DEBUG_READ_EVENT ))) return;
if ((process = get_process_from_id( req->pid )))
{
struct thread *thread = get_thread_from_id( req->tid );
if (thread)
{
continue_debug_event( debug_obj, process, thread, req->status );
release_object( thread );
}
release_object( process );
}
release_object( debug_obj );
}
/* start or stop debugging an existing process */
DECL_HANDLER(debug_process)
{
struct debug_obj *debug_obj;
struct process *process = get_process_from_handle( req->handle,
PROCESS_VM_READ | PROCESS_VM_WRITE | PROCESS_SUSPEND_RESUME );
if (!process) return;
if ((debug_obj = get_debug_obj( current->process, req->debug, DEBUG_PROCESS_ASSIGN )))
{
if (req->attach)
{
if (!process->debug_obj) debugger_attach( process, current, debug_obj );
else set_error( STATUS_ACCESS_DENIED );
}
else
{
if (process->debug_obj == debug_obj) debugger_detach( process, debug_obj );
else set_error( STATUS_ACCESS_DENIED );
}
release_object( debug_obj );
}
release_object( process );
}
/* queue an exception event */
DECL_HANDLER(queue_exception_event)
{
struct debug_obj *debug_obj = current->process->debug_obj;
reply->handle = 0;
if (debug_obj)
{
debug_event_t data;
struct debug_event *event;
struct thread *thread = current;
if ((req->len % sizeof(client_ptr_t)) != 0 ||
req->len > get_req_data_size() ||
req->len > EXCEPTION_MAXIMUM_PARAMETERS * sizeof(client_ptr_t))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
memset( &data, 0, sizeof(data) );
data.exception.first = req->first;
data.exception.exc_code = req->code;
data.exception.flags = req->flags;
data.exception.record = req->record;
data.exception.address = req->address;
data.exception.nb_params = req->len / sizeof(client_ptr_t);
memcpy( data.exception.params, get_req_data(), req->len );
if ((event = alloc_debug_event( thread, DbgExceptionStateChange, &data )))
{
if ((reply->handle = alloc_handle( thread->process, event, SYNCHRONIZE, 0 )))
{
link_event( debug_obj, event );
suspend_process( thread->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 );
set_error( event->state == EVENT_CONTINUED ? event->status : STATUS_PENDING );
release_object( event );
}
}
/* set debug object information */
DECL_HANDLER(set_debug_obj_info)
{
struct debug_obj *debug_obj;
if (!(debug_obj = get_debug_obj( current->process, req->debug, DEBUG_SET_INFORMATION ))) return;
debug_obj->flags = req->flags;
release_object( debug_obj );
}
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