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732 lines
24 KiB
C
732 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 "wine/port.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_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 thread *debugger; /* debugger thread receiving the event */
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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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context_t context; /* register context */
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};
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/* debug context */
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struct debug_ctx
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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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int kill_on_exit;/* kill debuggees on debugger exit ? */
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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 thread *thread );
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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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debug_event_dump, /* dump */
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no_get_type, /* get_type */
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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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no_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_lookup_name, /* lookup_name */
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no_open_file, /* open_file */
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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_ctx_dump( struct object *obj, int verbose );
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static int debug_ctx_signaled( struct object *obj, struct thread *thread );
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static void debug_ctx_destroy( struct object *obj );
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static const struct object_ops debug_ctx_ops =
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{
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sizeof(struct debug_ctx), /* size */
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debug_ctx_dump, /* dump */
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no_get_type, /* get_type */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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debug_ctx_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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no_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_lookup_name, /* lookup_name */
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no_open_file, /* open_file */
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no_close_handle, /* close_handle */
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debug_ctx_destroy /* destroy */
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};
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/* routines to build an event according to its type */
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static int 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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return 1;
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}
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static int fill_create_thread_event( struct debug_event *event, const void *arg )
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{
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struct process *debugger = event->debugger->process;
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struct thread *thread = event->sender;
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const client_ptr_t *entry = arg;
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obj_handle_t handle;
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/* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
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if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 ))) return 0;
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event->data.create_thread.handle = handle;
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event->data.create_thread.teb = thread->teb;
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if (entry) event->data.create_thread.start = *entry;
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return 1;
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}
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static int fill_create_process_event( struct debug_event *event, const void *arg )
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{
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struct process *debugger = event->debugger->process;
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struct thread *thread = event->sender;
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struct process *process = thread->process;
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struct process_dll *exe_module = get_process_exe_module( process );
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const client_ptr_t *entry = arg;
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obj_handle_t handle;
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/* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
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if (!(handle = alloc_handle( debugger, process, PROCESS_ALL_ACCESS, 0 ))) return 0;
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event->data.create_process.process = handle;
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/* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
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if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, 0 )))
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{
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close_handle( debugger, event->data.create_process.process );
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return 0;
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}
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event->data.create_process.thread = handle;
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event->data.create_process.file = 0;
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event->data.create_process.teb = thread->teb;
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event->data.create_process.base = exe_module->base;
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event->data.create_process.start = *entry;
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event->data.create_process.dbg_offset = exe_module->dbg_offset;
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event->data.create_process.dbg_size = exe_module->dbg_size;
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event->data.create_process.name = exe_module->name;
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event->data.create_process.unicode = 1;
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if (exe_module->mapping) /* the doc says write access too, but this doesn't seem a good idea */
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event->data.create_process.file = open_mapping_file( debugger, exe_module->mapping, GENERIC_READ,
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FILE_SHARE_READ | FILE_SHARE_WRITE );
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return 1;
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}
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static int 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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return 1;
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}
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static int 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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return 1;
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}
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static int fill_load_dll_event( struct debug_event *event, const void *arg )
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{
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struct process *debugger = event->debugger->process;
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const struct process_dll *dll = arg;
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event->data.load_dll.handle = 0;
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event->data.load_dll.base = dll->base;
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event->data.load_dll.dbg_offset = dll->dbg_offset;
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event->data.load_dll.dbg_size = dll->dbg_size;
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event->data.load_dll.name = dll->name;
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event->data.load_dll.unicode = 1;
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if (dll->mapping)
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event->data.load_dll.handle = open_mapping_file( debugger, dll->mapping, GENERIC_READ,
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FILE_SHARE_READ | FILE_SHARE_WRITE );
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return 1;
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}
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static int fill_unload_dll_event( struct debug_event *event, const void *arg )
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{
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const mod_handle_t *base = arg;
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event->data.unload_dll.base = *base;
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return 1;
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}
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static int fill_output_debug_string_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.output_string = data->output_string;
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return 1;
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}
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typedef int (*fill_event_func)( struct debug_event *event, const void *arg );
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#define NB_DEBUG_EVENTS OUTPUT_DEBUG_STRING_EVENT /* RIP_EVENT not supported */
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static const fill_event_func fill_debug_event[NB_DEBUG_EVENTS] =
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{
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fill_exception_event, /* EXCEPTION_DEBUG_EVENT */
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fill_create_thread_event, /* CREATE_THREAD_DEBUG_EVENT */
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fill_create_process_event, /* CREATE_PROCESS_DEBUG_EVENT */
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fill_exit_thread_event, /* EXIT_THREAD_DEBUG_EVENT */
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fill_exit_process_event, /* EXIT_PROCESS_DEBUG_EVENT */
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fill_load_dll_event, /* LOAD_DLL_DEBUG_EVENT */
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fill_unload_dll_event, /* UNLOAD_DLL_DEBUG_EVENT */
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fill_output_debug_string_event /* OUTPUT_DEBUG_STRING_EVENT */
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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_ctx *debug_ctx, struct debug_event *event )
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{
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list_remove( &event->entry );
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if (event->sender->debug_event == event) event->sender->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_event *event )
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{
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struct debug_ctx *debug_ctx = event->debugger->debug_ctx;
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assert( debug_ctx );
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grab_object( event );
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list_add_tail( &debug_ctx->event_queue, &event->entry );
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if (!event->sender->debug_event) wake_up( &debug_ctx->obj, 0 );
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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_ctx *debug_ctx )
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{
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struct debug_event *event;
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LIST_FOR_EACH_ENTRY( event, &debug_ctx->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->sender->debug_event) continue; /* thread 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 thread *thread )
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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 the event has been sent already, the handles are now under the */
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/* responsibility of the debugger process, so we don't touch them */
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if (event->state == EVENT_QUEUED)
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{
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struct process *debugger = event->debugger->process;
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switch(event->data.code)
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{
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case CREATE_THREAD_DEBUG_EVENT:
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close_handle( debugger, event->data.create_thread.handle );
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break;
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case CREATE_PROCESS_DEBUG_EVENT:
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if (event->data.create_process.file)
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close_handle( debugger, event->data.create_process.file );
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close_handle( debugger, event->data.create_process.thread );
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close_handle( debugger, event->data.create_process.process );
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break;
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case LOAD_DLL_DEBUG_EVENT:
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if (event->data.load_dll.handle)
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close_handle( debugger, event->data.load_dll.handle );
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break;
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}
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}
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if (event->sender->context == &event->context)
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{
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event->sender->context = NULL;
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stop_thread_if_suspended( event->sender );
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}
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release_object( event->sender );
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release_object( event->debugger );
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}
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static void debug_ctx_dump( struct object *obj, int verbose )
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{
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struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
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assert( obj->ops == &debug_ctx_ops );
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fprintf( stderr, "Debug context head=%p tail=%p\n",
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debug_ctx->event_queue.next, debug_ctx->event_queue.prev );
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}
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static int debug_ctx_signaled( struct object *obj, struct thread *thread )
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{
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struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
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assert( obj->ops == &debug_ctx_ops );
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return find_event_to_send( debug_ctx ) != NULL;
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}
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static void debug_ctx_destroy( struct object *obj )
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{
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struct list *ptr;
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struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
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assert( obj->ops == &debug_ctx_ops );
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/* free all pending events */
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while ((ptr = list_head( &debug_ctx->event_queue )))
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unlink_event( debug_ctx, LIST_ENTRY( ptr, struct debug_event, entry ));
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}
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/* continue a debug event */
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static int continue_debug_event( struct process *process, struct thread *thread, int status )
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{
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struct debug_ctx *debug_ctx = current->debug_ctx;
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if (debug_ctx && process->debugger == current && thread->process == process)
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{
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struct debug_event *event;
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/* find the event in the queue */
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LIST_FOR_EACH_ENTRY( event, &debug_ctx->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->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_ctx, 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 thread *debugger = thread->process->debugger;
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struct debug_event *event;
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assert( code > 0 && code <= NB_DEBUG_EVENTS );
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/* cannot queue a debug event for myself */
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assert( debugger->process != thread->process );
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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->debugger = (struct thread *)grab_object( debugger );
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memset( &event->data, 0, sizeof(event->data) );
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if (!fill_debug_event[code-1]( event, arg ))
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{
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event->data.code = -1; /* make sure we don't attempt to close handles */
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release_object( event );
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return NULL;
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}
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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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if (thread->process->debugger)
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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( 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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/* attach a process to a debugger thread and suspend it */
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static int debugger_attach( struct process *process, struct thread *debugger )
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{
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if (process->debugger) goto error; /* already being debugged */
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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 */
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if (debugger->process->console)
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{
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struct thread *renderer = console_get_renderer(debugger->process->console);
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if (renderer && renderer->process == process)
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goto error;
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}
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suspend_process( process );
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if (!set_process_debugger( process, debugger ))
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{
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resume_process( process );
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return 0;
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}
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if (!set_process_debug_flag( process, 1 ))
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{
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process->debugger = NULL;
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resume_process( process );
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return 0;
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}
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return 1;
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error:
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set_error( STATUS_ACCESS_DENIED );
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return 0;
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}
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/* detach a process from a debugger thread (and resume it ?) */
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int debugger_detach( struct process *process, struct thread *debugger )
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{
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struct debug_event *event, *next;
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struct debug_ctx *debug_ctx;
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if (!process->debugger || process->debugger != debugger)
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goto error; /* not currently debugged, or debugged by another debugger */
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if (!debugger->debug_ctx ) goto error; /* should be a debugger */
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/* init should be done, otherwise wouldn't be attached */
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assert(is_process_init_done(process));
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suspend_process( process );
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/* send continue indication for all events */
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debug_ctx = debugger->debug_ctx;
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/* free all events from this process */
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LIST_FOR_EACH_ENTRY_SAFE( event, next, &debug_ctx->event_queue, struct debug_event, entry )
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{
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if (event->sender->process != process) continue;
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assert( event->state != EVENT_CONTINUED );
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event->status = DBG_CONTINUE;
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event->state = EVENT_CONTINUED;
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wake_up( &event->obj, 0 );
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unlink_event( debug_ctx, event );
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/* from queued debug event */
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resume_process( process );
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}
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/* remove relationships between process and its debugger */
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process->debugger = NULL;
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process->debug_children = 0;
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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, client_ptr_t 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 != list_head( &process->dlls ))
|
|
{
|
|
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, STATUS_DEBUGGER_INACTIVE );
|
|
}
|
|
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 )))
|
|
{
|
|
data_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 ))
|
|
{
|
|
generate_startup_debug_events( process, 0 );
|
|
break_process( process );
|
|
resume_process( process );
|
|
}
|
|
release_object( process );
|
|
}
|
|
|
|
/* queue an exception event */
|
|
DECL_HANDLER(queue_exception_event)
|
|
{
|
|
reply->handle = 0;
|
|
if (current->process->debugger)
|
|
{
|
|
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, EXCEPTION_DEBUG_EVENT, &data )))
|
|
{
|
|
const context_t *context = (const context_t *)((const char *)get_req_data() + req->len);
|
|
data_size_t size = get_req_data_size() - req->len;
|
|
|
|
memset( &event->context, 0, sizeof(event->context) );
|
|
memcpy( &event->context, context, min( sizeof(event->context), size ) );
|
|
thread->context = &event->context;
|
|
|
|
if ((reply->handle = alloc_handle( thread->process, event, SYNCHRONIZE, 0 )))
|
|
{
|
|
link_event( 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 );
|
|
if (event->state == EVENT_CONTINUED)
|
|
{
|
|
if (current->context == &event->context)
|
|
{
|
|
data_size_t size = min( sizeof(context_t), get_reply_max_size() );
|
|
set_reply_data( &event->context, size );
|
|
current->context = NULL;
|
|
stop_thread_if_suspended( current );
|
|
}
|
|
set_error( event->status );
|
|
}
|
|
else set_error( STATUS_PENDING );
|
|
release_object( event );
|
|
}
|
|
}
|
|
|
|
/* send an output string to the debugger */
|
|
DECL_HANDLER(output_debug_string)
|
|
{
|
|
debug_event_t data;
|
|
|
|
data.output_string.string = req->string;
|
|
data.output_string.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*/ )))
|
|
{
|
|
if (process != current->process) break_process( process );
|
|
else reply->self = 1;
|
|
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;
|
|
}
|