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699 lines
24 KiB
C
699 lines
24 KiB
C
/*
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* Server-side debugger functions
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*
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* Copyright (C) 1999 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include <assert.h>
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#include <signal.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "winternl.h"
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#include "handle.h"
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#include "file.h"
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#include "process.h"
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#include "thread.h"
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#include "request.h"
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enum debug_event_state { EVENT_QUEUED, EVENT_SENT, EVENT_DELAYED, EVENT_CONTINUED };
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/* debug event */
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struct debug_event
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{
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struct object obj; /* object header */
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struct list entry; /* entry in event queue */
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struct thread *sender; /* thread which sent this event */
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struct file *file; /* file object for events that need one */
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enum debug_event_state state; /* event state */
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int status; /* continuation status */
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debug_event_t data; /* event data */
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};
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static const WCHAR debug_obj_name[] = {'D','e','b','u','g','O','b','j','e','c','t'};
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struct type_descr debug_obj_type =
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{
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{ debug_obj_name, sizeof(debug_obj_name) }, /* name */
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DEBUG_ALL_ACCESS | SYNCHRONIZE, /* valid_access */
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{ /* mapping */
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STANDARD_RIGHTS_READ | DEBUG_READ_EVENT,
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STANDARD_RIGHTS_WRITE | DEBUG_PROCESS_ASSIGN,
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STANDARD_RIGHTS_EXECUTE | SYNCHRONIZE,
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DEBUG_ALL_ACCESS
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},
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};
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/* debug object */
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struct debug_obj
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{
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struct object obj; /* object header */
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struct list event_queue; /* pending events queue */
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unsigned int flags; /* debug flags */
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};
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static void debug_event_dump( struct object *obj, int verbose );
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static int debug_event_signaled( struct object *obj, struct wait_queue_entry *entry );
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static void debug_event_destroy( struct object *obj );
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static const struct object_ops debug_event_ops =
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{
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sizeof(struct debug_event), /* size */
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&no_type, /* type */
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debug_event_dump, /* dump */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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debug_event_signaled, /* signaled */
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no_satisfied, /* satisfied */
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no_signal, /* signal */
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no_get_fd, /* get_fd */
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default_map_access, /* map_access */
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default_get_sd, /* get_sd */
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default_set_sd, /* set_sd */
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no_get_full_name, /* get_full_name */
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no_lookup_name, /* lookup_name */
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no_link_name, /* link_name */
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NULL, /* unlink_name */
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no_open_file, /* open_file */
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no_kernel_obj_list, /* get_kernel_obj_list */
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no_close_handle, /* close_handle */
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debug_event_destroy /* destroy */
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};
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static void debug_obj_dump( struct object *obj, int verbose );
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static int debug_obj_signaled( struct object *obj, struct wait_queue_entry *entry );
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static void debug_obj_destroy( struct object *obj );
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static const struct object_ops debug_obj_ops =
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{
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sizeof(struct debug_obj), /* size */
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&debug_obj_type, /* type */
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debug_obj_dump, /* dump */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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debug_obj_signaled, /* signaled */
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no_satisfied, /* satisfied */
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no_signal, /* signal */
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no_get_fd, /* get_fd */
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default_map_access, /* map_access */
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default_get_sd, /* get_sd */
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default_set_sd, /* set_sd */
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default_get_full_name, /* get_full_name */
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no_lookup_name, /* lookup_name */
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directory_link_name, /* link_name */
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default_unlink_name, /* unlink_name */
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no_open_file, /* open_file */
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no_kernel_obj_list, /* get_kernel_obj_list */
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no_close_handle, /* close_handle */
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debug_obj_destroy /* destroy */
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};
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/* get a pointer to TEB->ArbitraryUserPointer in the client address space */
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static client_ptr_t get_teb_user_ptr( struct thread *thread )
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{
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unsigned int ptr_size = is_machine_64bit( native_machine ) ? 8 : 4;
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return thread->teb + 5 * ptr_size;
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}
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/* routines to build an event according to its type */
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static void fill_exception_event( struct debug_event *event, const void *arg )
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{
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const debug_event_t *data = arg;
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event->data.exception = data->exception;
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event->data.exception.nb_params = min( event->data.exception.nb_params, EXCEPTION_MAXIMUM_PARAMETERS );
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}
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static void fill_create_thread_event( struct debug_event *event, const void *arg )
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{
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const client_ptr_t *entry = arg;
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if (entry) event->data.create_thread.start = *entry;
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}
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static void fill_create_process_event( struct debug_event *event, const void *arg )
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{
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const struct memory_view *view = arg;
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const pe_image_info_t *image_info = get_view_image_info( view, &event->data.create_process.base );
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event->data.create_process.start = event->data.create_process.base + image_info->entry_point;
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event->data.create_process.dbg_offset = image_info->dbg_offset;
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event->data.create_process.dbg_size = image_info->dbg_size;
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/* the doc says write access too, but this doesn't seem a good idea */
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event->file = get_view_file( view, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE );
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}
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static void fill_exit_thread_event( struct debug_event *event, const void *arg )
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{
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const struct thread *thread = arg;
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event->data.exit.exit_code = thread->exit_code;
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}
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static void fill_exit_process_event( struct debug_event *event, const void *arg )
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{
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const struct process *process = arg;
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event->data.exit.exit_code = process->exit_code;
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}
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static void fill_load_dll_event( struct debug_event *event, const void *arg )
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{
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const struct memory_view *view = arg;
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const pe_image_info_t *image_info = get_view_image_info( view, &event->data.load_dll.base );
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event->data.load_dll.dbg_offset = image_info->dbg_offset;
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event->data.load_dll.dbg_size = image_info->dbg_size;
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event->data.load_dll.name = get_teb_user_ptr( event->sender );
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event->file = get_view_file( view, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE );
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}
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static void fill_unload_dll_event( struct debug_event *event, const void *arg )
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{
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const struct memory_view *view = arg;
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get_view_image_info( view, &event->data.unload_dll.base );
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}
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typedef void (*fill_event_func)( struct debug_event *event, const void *arg );
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static const fill_event_func fill_debug_event[] =
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{
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fill_create_thread_event, /* DbgCreateThreadStateChange */
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fill_create_process_event, /* DbgCreateProcessStateChange */
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fill_exit_thread_event, /* DbgExitThreadStateChange */
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fill_exit_process_event, /* DbgExitProcessStateChange */
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fill_exception_event, /* DbgExceptionStateChange */
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fill_exception_event, /* DbgBreakpointStateChange */
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fill_exception_event, /* DbgSingleStepStateChange */
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fill_load_dll_event, /* DbgLoadDllStateChange */
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fill_unload_dll_event /* DbgUnloadDllStateChange */
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};
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/* allocate the necessary handles in the event data */
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static void alloc_event_handles( struct debug_event *event, struct process *process )
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{
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switch (event->data.code)
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{
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case DbgCreateThreadStateChange:
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/* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
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event->data.create_thread.handle = alloc_handle( process, event->sender, THREAD_ALL_ACCESS, 0 );
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break;
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case DbgCreateProcessStateChange:
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event->data.create_process.thread = alloc_handle( process, event->sender, THREAD_ALL_ACCESS, 0 );
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/* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
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event->data.create_process.process = alloc_handle( process, event->sender->process,
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PROCESS_ALL_ACCESS, 0 );
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if (event->file)
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event->data.create_process.file = alloc_handle( process, event->file, GENERIC_READ, 0 );
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break;
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case DbgLoadDllStateChange:
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if (event->file)
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event->data.load_dll.handle = alloc_handle( process, event->file, GENERIC_READ, 0 );
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break;
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}
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clear_error(); /* ignore errors, simply set handles to 0 */
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}
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/* unlink the first event from the queue */
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static void unlink_event( struct debug_obj *debug_obj, struct debug_event *event )
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{
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list_remove( &event->entry );
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if (event->sender->process->debug_event == event) event->sender->process->debug_event = NULL;
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release_object( event );
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}
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/* link an event at the end of the queue */
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static void link_event( struct debug_obj *debug_obj, struct debug_event *event )
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{
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grab_object( event );
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list_add_tail( &debug_obj->event_queue, &event->entry );
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if (!event->sender->process->debug_event)
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{
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/* grab reference since debugger could be killed while trying to wake up */
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grab_object( debug_obj );
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wake_up( &debug_obj->obj, 0 );
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release_object( debug_obj );
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}
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}
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/* resume a delayed debug event already in the queue */
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static void resume_event( struct debug_obj *debug_obj, struct debug_event *event )
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{
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event->state = EVENT_QUEUED;
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if (!event->sender->process->debug_event)
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{
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grab_object( debug_obj );
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wake_up( &debug_obj->obj, 0 );
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release_object( debug_obj );
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}
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}
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/* delay a debug event already in the queue to be replayed when thread wakes up */
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static void delay_event( struct debug_obj *debug_obj, struct debug_event *event )
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{
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event->state = EVENT_DELAYED;
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if (event->sender->process->debug_event == event) event->sender->process->debug_event = NULL;
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}
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/* find the next event that we can send to the debugger */
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static struct debug_event *find_event_to_send( struct debug_obj *debug_obj )
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{
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struct debug_event *event;
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LIST_FOR_EACH_ENTRY( event, &debug_obj->event_queue, struct debug_event, entry )
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{
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if (event->state == EVENT_SENT) continue; /* already sent */
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if (event->state == EVENT_DELAYED) continue; /* delayed until thread resumes */
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if (event->sender->process->debug_event) continue; /* process busy with another one */
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return event;
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}
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return NULL;
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}
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static void debug_event_dump( struct object *obj, int verbose )
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{
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struct debug_event *debug_event = (struct debug_event *)obj;
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assert( obj->ops == &debug_event_ops );
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fprintf( stderr, "Debug event sender=%p code=%d state=%d\n",
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debug_event->sender, debug_event->data.code, debug_event->state );
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}
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static int debug_event_signaled( struct object *obj, struct wait_queue_entry *entry )
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{
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struct debug_event *debug_event = (struct debug_event *)obj;
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assert( obj->ops == &debug_event_ops );
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return debug_event->state == EVENT_CONTINUED;
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}
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static void debug_event_destroy( struct object *obj )
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{
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struct debug_event *event = (struct debug_event *)obj;
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assert( obj->ops == &debug_event_ops );
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if (event->file) release_object( event->file );
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release_object( event->sender );
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}
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static void debug_obj_dump( struct object *obj, int verbose )
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{
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struct debug_obj *debug_obj = (struct debug_obj *)obj;
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assert( obj->ops == &debug_obj_ops );
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fprintf( stderr, "Debug context head=%p tail=%p\n",
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debug_obj->event_queue.next, debug_obj->event_queue.prev );
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}
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static int debug_obj_signaled( struct object *obj, struct wait_queue_entry *entry )
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{
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struct debug_obj *debug_obj = (struct debug_obj *)obj;
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assert( obj->ops == &debug_obj_ops );
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return find_event_to_send( debug_obj ) != NULL;
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}
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static void debug_obj_destroy( struct object *obj )
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{
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struct list *ptr;
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struct debug_obj *debug_obj = (struct debug_obj *)obj;
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assert( obj->ops == &debug_obj_ops );
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detach_debugged_processes( debug_obj,
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(debug_obj->flags & DEBUG_KILL_ON_CLOSE) ? STATUS_DEBUGGER_INACTIVE : 0 );
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/* free all pending events */
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while ((ptr = list_head( &debug_obj->event_queue )))
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unlink_event( debug_obj, LIST_ENTRY( ptr, struct debug_event, entry ));
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}
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struct debug_obj *get_debug_obj( struct process *process, obj_handle_t handle, unsigned int access )
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{
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return (struct debug_obj *)get_handle_obj( process, handle, access, &debug_obj_ops );
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}
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static struct debug_obj *create_debug_obj( struct object *root, const struct unicode_str *name,
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unsigned int attr, unsigned int flags,
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const struct security_descriptor *sd )
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{
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struct debug_obj *debug_obj;
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if ((debug_obj = create_named_object( root, &debug_obj_ops, name, attr, sd )))
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{
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if (get_error() != STATUS_OBJECT_NAME_EXISTS)
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{
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debug_obj->flags = flags;
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list_init( &debug_obj->event_queue );
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}
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}
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return debug_obj;
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}
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/* continue a debug event */
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static int continue_debug_event( struct debug_obj *debug_obj, struct process *process,
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struct thread *thread, int status )
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{
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if (process->debug_obj == debug_obj && thread->process == process)
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{
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struct debug_event *event;
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if (status == DBG_REPLY_LATER)
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{
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/* if thread is suspended, delay all its events and resume process
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* if not, reset the event for immediate replay */
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LIST_FOR_EACH_ENTRY( event, &debug_obj->event_queue, struct debug_event, entry )
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{
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if (event->sender != thread) continue;
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if (thread->suspend)
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{
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delay_event( debug_obj, event );
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resume_process( process );
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}
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else if (event->state == EVENT_SENT)
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{
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assert( event->sender->process->debug_event == event );
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event->sender->process->debug_event = NULL;
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resume_event( debug_obj, event );
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return 1;
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}
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}
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return 1;
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}
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/* find the event in the queue */
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LIST_FOR_EACH_ENTRY( event, &debug_obj->event_queue, struct debug_event, entry )
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{
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if (event->state != EVENT_SENT) continue;
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if (event->sender == thread)
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{
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assert( event->sender->process->debug_event == event );
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event->status = status;
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event->state = EVENT_CONTINUED;
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wake_up( &event->obj, 0 );
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unlink_event( debug_obj, event );
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resume_process( process );
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return 1;
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}
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}
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}
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/* not debugging this process, or no such event */
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set_error( STATUS_ACCESS_DENIED ); /* FIXME */
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return 0;
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}
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/* alloc a debug event for a debugger */
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static struct debug_event *alloc_debug_event( struct thread *thread, int code, const void *arg )
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{
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struct debug_event *event;
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assert( code >= DbgCreateThreadStateChange && code <= DbgUnloadDllStateChange );
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/* build the event */
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if (!(event = alloc_object( &debug_event_ops ))) return NULL;
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event->state = EVENT_QUEUED;
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event->sender = (struct thread *)grab_object( thread );
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event->file = NULL;
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memset( &event->data, 0, sizeof(event->data) );
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fill_debug_event[code - DbgCreateThreadStateChange]( event, arg );
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event->data.code = code;
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return event;
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}
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/* generate a debug event from inside the server and queue it */
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void generate_debug_event( struct thread *thread, int code, const void *arg )
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{
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struct debug_obj *debug_obj = thread->process->debug_obj;
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if (debug_obj)
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{
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struct debug_event *event = alloc_debug_event( thread, code, arg );
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if (event)
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{
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link_event( debug_obj, event );
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suspend_process( thread->process );
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release_object( event );
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}
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clear_error(); /* ignore errors */
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}
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}
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void resume_delayed_debug_events( struct thread *thread )
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{
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struct debug_obj *debug_obj = thread->process->debug_obj;
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struct debug_event *event;
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if (debug_obj)
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{
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LIST_FOR_EACH_ENTRY( event, &debug_obj->event_queue, struct debug_event, entry )
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{
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if (event->sender != thread) continue;
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if (event->state != EVENT_DELAYED) continue;
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resume_event( debug_obj, event );
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suspend_process( thread->process );
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}
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}
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}
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/* attach a process to a debugger thread and suspend it */
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static int debugger_attach( struct process *process, struct thread *debugger, struct debug_obj *debug_obj )
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{
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if (debugger->process == process) goto error;
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if (!is_process_init_done( process )) goto error; /* still starting up */
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if (list_empty( &process->thread_list )) goto error; /* no thread running in the process */
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/* 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 );
|
|
}
|