Sweden-Number/server/debugger.c

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/*
* Server-side debugger functions
*
* Copyright (C) 1999 Alexandre Julliard
*/
#include <assert.h>
#include <string.h>
#include <stdio.h>
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#include "winbase.h"
#include "handle.h"
#include "process.h"
#include "thread.h"
#include "request.h"
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enum debug_event_state { EVENT_QUEUED, EVENT_SENT, EVENT_CONTINUED };
/* debug event */
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struct debug_event
{
struct object obj; /* object header */
struct debug_event *next; /* event queue */
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struct debug_event *prev;
struct thread *sender; /* thread which sent this event */
struct thread *debugger; /* debugger thread receiving the event */
enum debug_event_state state; /* event state */
int status; /* continuation status */
debug_event_t data; /* event data */
CONTEXT context; /* register context */
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};
/* debug context */
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struct debug_ctx
{
struct object obj; /* object header */
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struct debug_event *event_head; /* head of pending events queue */
struct debug_event *event_tail; /* tail of pending events queue */
};
static void debug_event_dump( struct object *obj, int verbose );
static int debug_event_signaled( struct object *obj, struct thread *thread );
static void debug_event_destroy( struct object *obj );
static const struct object_ops debug_event_ops =
{
sizeof(struct debug_event), /* size */
debug_event_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
debug_event_signaled, /* signaled */
no_satisfied, /* satisfied */
NULL, /* get_poll_events */
NULL, /* poll_event */
no_get_fd, /* get_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
debug_event_destroy /* destroy */
};
static void debug_ctx_dump( struct object *obj, int verbose );
static int debug_ctx_signaled( struct object *obj, struct thread *thread );
static void debug_ctx_destroy( struct object *obj );
static const struct object_ops debug_ctx_ops =
{
sizeof(struct debug_ctx), /* size */
debug_ctx_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
debug_ctx_signaled, /* signaled */
no_satisfied, /* satisfied */
NULL, /* get_poll_events */
NULL, /* poll_event */
no_get_fd, /* get_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
debug_ctx_destroy /* destroy */
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};
/* routines to build an event according to its type */
static int fill_exception_event( struct debug_event *event, void *arg )
{
memcpy( &event->data.info.exception, arg, sizeof(event->data.info.exception) );
return 1;
}
static int fill_create_thread_event( struct debug_event *event, void *arg )
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{
struct process *debugger = event->debugger->process;
struct thread *thread = event->sender;
handle_t handle;
/* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, FALSE ))) return 0;
event->data.info.create_thread.handle = handle;
event->data.info.create_thread.teb = thread->teb;
event->data.info.create_thread.start = arg;
return 1;
}
static int fill_create_process_event( struct debug_event *event, void *arg )
{
struct process *debugger = event->debugger->process;
struct thread *thread = event->sender;
struct process *process = thread->process;
handle_t handle;
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/* documented: PROCESS_VM_READ | PROCESS_VM_WRITE */
if (!(handle = alloc_handle( debugger, process, PROCESS_ALL_ACCESS, FALSE ))) return 0;
event->data.info.create_process.process = handle;
/* documented: THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME */
if (!(handle = alloc_handle( debugger, thread, THREAD_ALL_ACCESS, FALSE )))
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{
close_handle( debugger, event->data.info.create_process.process, NULL );
return 0;
}
event->data.info.create_process.thread = handle;
handle = 0;
if (process->exe.file &&
/* the doc says write access too, but this doesn't seem a good idea */
!(handle = alloc_handle( debugger, process->exe.file, GENERIC_READ, FALSE )))
{
close_handle( debugger, event->data.info.create_process.process, NULL );
close_handle( debugger, event->data.info.create_process.thread, NULL );
return 0;
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}
event->data.info.create_process.file = handle;
event->data.info.create_process.teb = thread->teb;
event->data.info.create_process.base = process->exe.base;
event->data.info.create_process.start = arg;
event->data.info.create_process.dbg_offset = process->exe.dbg_offset;
event->data.info.create_process.dbg_size = process->exe.dbg_size;
event->data.info.create_process.name = process->exe.name;
event->data.info.create_process.unicode = 0;
return 1;
}
static int fill_exit_thread_event( struct debug_event *event, void *arg )
{
struct thread *thread = arg;
event->data.info.exit.exit_code = thread->exit_code;
return 1;
}
static int fill_exit_process_event( struct debug_event *event, void *arg )
{
struct process *process = arg;
event->data.info.exit.exit_code = process->exit_code;
return 1;
}
static int fill_load_dll_event( struct debug_event *event, void *arg )
{
struct process *debugger = event->debugger->process;
struct process_dll *dll = arg;
handle_t handle = 0;
if (dll->file && !(handle = alloc_handle( debugger, dll->file, GENERIC_READ, FALSE )))
return 0;
event->data.info.load_dll.handle = handle;
event->data.info.load_dll.base = dll->base;
event->data.info.load_dll.dbg_offset = dll->dbg_offset;
event->data.info.load_dll.dbg_size = dll->dbg_size;
event->data.info.load_dll.name = dll->name;
event->data.info.load_dll.unicode = 0;
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return 1;
}
static int fill_unload_dll_event( struct debug_event *event, void *arg )
{
event->data.info.unload_dll.base = arg;
return 1;
}
static int fill_output_debug_string_event( struct debug_event *event, void *arg )
{
struct debug_event_output_string *data = arg;
event->data.info.output_string = *data;
return 1;
}
typedef int (*fill_event_func)( struct debug_event *event, void *arg );
#define NB_DEBUG_EVENTS OUTPUT_DEBUG_STRING_EVENT /* RIP_EVENT not supported */
static const fill_event_func fill_debug_event[NB_DEBUG_EVENTS] =
{
fill_exception_event, /* EXCEPTION_DEBUG_EVENT */
fill_create_thread_event, /* CREATE_THREAD_DEBUG_EVENT */
fill_create_process_event, /* CREATE_PROCESS_DEBUG_EVENT */
fill_exit_thread_event, /* EXIT_THREAD_DEBUG_EVENT */
fill_exit_process_event, /* EXIT_PROCESS_DEBUG_EVENT */
fill_load_dll_event, /* LOAD_DLL_DEBUG_EVENT */
fill_unload_dll_event, /* UNLOAD_DLL_DEBUG_EVENT */
fill_output_debug_string_event /* OUTPUT_DEBUG_STRING_EVENT */
};
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/* unlink the first event from the queue */
static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event )
{
if (event->prev) event->prev->next = event->next;
else debug_ctx->event_head = event->next;
if (event->next) event->next->prev = event->prev;
else debug_ctx->event_tail = event->prev;
event->next = event->prev = NULL;
if (event->sender->debug_event == event) event->sender->debug_event = NULL;
release_object( event );
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}
/* link an event at the end of the queue */
static void link_event( struct debug_event *event )
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{
struct debug_ctx *debug_ctx = event->debugger->debug_ctx;
assert( debug_ctx );
grab_object( event );
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event->next = NULL;
event->prev = debug_ctx->event_tail;
debug_ctx->event_tail = event;
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if (event->prev) event->prev->next = event;
else debug_ctx->event_head = event;
if (!event->sender->debug_event) wake_up( &debug_ctx->obj, 0 );
}
/* find the next event that we can send to the debugger */
static struct debug_event *find_event_to_send( struct debug_ctx *debug_ctx )
{
struct debug_event *event;
for (event = debug_ctx->event_head; event; event = event->next)
{
if (event->state == EVENT_SENT) continue; /* already sent */
if (event->sender->debug_event) continue; /* thread busy with another one */
break;
}
return event;
}
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 );
}
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static int debug_event_signaled( struct object *obj, struct thread *thread )
{
struct debug_event *debug_event = (struct debug_event *)obj;
assert( obj->ops == &debug_event_ops );
return debug_event->state == EVENT_CONTINUED;
}
static void debug_event_destroy( struct object *obj )
{
struct debug_event *event = (struct debug_event *)obj;
assert( obj->ops == &debug_event_ops );
/* cannot still be in the queue */
assert( !event->next );
assert( !event->prev );
/* If the event has been sent already, the handles are now under the */
/* responsibility of the debugger process, so we don't touch them */
if (event->state == EVENT_QUEUED)
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{
struct process *debugger = event->debugger->process;
switch(event->data.code)
{
case CREATE_THREAD_DEBUG_EVENT:
close_handle( debugger, event->data.info.create_thread.handle, NULL );
break;
case CREATE_PROCESS_DEBUG_EVENT:
if (event->data.info.create_process.file)
close_handle( debugger, event->data.info.create_process.file, NULL );
close_handle( debugger, event->data.info.create_process.thread, NULL );
close_handle( debugger, event->data.info.create_process.process, NULL );
break;
case LOAD_DLL_DEBUG_EVENT:
if (event->data.info.load_dll.handle)
close_handle( debugger, event->data.info.load_dll.handle, NULL );
break;
}
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}
if (event->sender->context == &event->context) event->sender->context = NULL;
release_object( event->sender );
release_object( event->debugger );
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}
static void debug_ctx_dump( struct object *obj, int verbose )
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{
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
assert( obj->ops == &debug_ctx_ops );
fprintf( stderr, "Debug context head=%p tail=%p\n",
debug_ctx->event_head, debug_ctx->event_tail );
}
static int debug_ctx_signaled( struct object *obj, struct thread *thread )
{
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
assert( obj->ops == &debug_ctx_ops );
return find_event_to_send( debug_ctx ) != NULL;
}
static void debug_ctx_destroy( struct object *obj )
{
struct debug_event *event;
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
assert( obj->ops == &debug_ctx_ops );
/* free all pending events */
while ((event = debug_ctx->event_head) != NULL) unlink_event( debug_ctx, event );
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}
/* continue a debug event */
static int continue_debug_event( struct process *process, struct thread *thread, int status )
{
struct debug_event *event;
struct debug_ctx *debug_ctx = current->debug_ctx;
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if (!debug_ctx || process->debugger != current || thread->process != process) goto error;
/* find the event in the queue */
for (event = debug_ctx->event_head; event; event = event->next)
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{
if (event->state != EVENT_SENT) continue;
if (event->sender == thread) break;
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}
if (!event) goto error;
assert( event->sender->debug_event == event );
event->status = status;
event->state = EVENT_CONTINUED;
wake_up( &event->obj, 0 );
unlink_event( debug_ctx, event );
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resume_process( process );
return 1;
error:
/* not debugging this process, or no such event */
set_error( STATUS_ACCESS_DENIED ); /* FIXME */
return 0;
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}
/* alloc a debug event for a debugger */
static struct debug_event *alloc_debug_event( struct thread *thread, int code,
void *arg, CONTEXT *context )
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{
struct thread *debugger = thread->process->debugger;
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struct debug_event *event;
assert( code > 0 && code <= NB_DEBUG_EVENTS );
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/* cannot queue a debug event for myself */
assert( debugger->process != thread->process );
/* build the event */
if (!(event = alloc_object( &debug_event_ops, -1 ))) return NULL;
event->next = NULL;
event->prev = NULL;
event->state = EVENT_QUEUED;
event->sender = (struct thread *)grab_object( thread );
event->debugger = (struct thread *)grab_object( debugger );
event->data.code = code;
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if (!fill_debug_event[code-1]( event, arg ))
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{
event->data.code = -1; /* make sure we don't attempt to close handles */
release_object( event );
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return NULL;
}
if (context)
{
memcpy( &event->context, context, sizeof(event->context) );
thread->context = &event->context;
}
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return event;
}
/* generate a debug event from inside the server and queue it */
void generate_debug_event( struct thread *thread, int code, void *arg )
{
if (thread->process->debugger)
{
struct debug_event *event = alloc_debug_event( thread, code, arg, NULL );
if (event)
{
link_event( event );
suspend_process( thread->process );
release_object( event );
}
}
}
/* attach a process to a debugger thread and suspend it */
static int debugger_attach( struct process *process, struct thread *debugger )
{
struct thread *thread;
if (process->debugger) goto error; /* already being debugged */
if (process->init_event) goto error; /* still starting up */
/* make sure we don't create a debugging loop */
for (thread = debugger; thread; thread = thread->process->debugger)
if (thread->process == process) goto error;
suspend_process( process );
/* we must have been able to attach all threads */
for (thread = process->thread_list; thread; thread = thread->proc_next)
if (!thread->attached)
{
fprintf( stderr, "%p not attached\n", thread );
resume_process( process );
goto error;
}
if (set_process_debugger( process, debugger )) return 1;
resume_process( process );
return 0;
error:
set_error( STATUS_ACCESS_DENIED );
return 0;
}
/* generate all startup events of a given process */
void generate_startup_debug_events( struct process *process, void *entry )
{
struct process_dll *dll;
struct thread *thread = process->thread_list;
/* generate creation events */
generate_debug_event( thread, CREATE_PROCESS_DEBUG_EVENT, entry );
while ((thread = thread->proc_next))
generate_debug_event( thread, CREATE_THREAD_DEBUG_EVENT, NULL );
/* generate dll events (in loading order, i.e. reverse list order) */
dll = &process->exe;
while (dll->next) dll = dll->next;
while (dll != &process->exe)
{
generate_debug_event( process->thread_list, LOAD_DLL_DEBUG_EVENT, dll );
dll = dll->prev;
}
}
/* set the debugger of a given process */
int set_process_debugger( struct process *process, struct thread *debugger )
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{
struct debug_ctx *debug_ctx;
assert( !process->debugger );
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if (!debugger->debug_ctx) /* need to allocate a context */
{
if (!(debug_ctx = alloc_object( &debug_ctx_ops, -1 ))) return 0;
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debug_ctx->event_head = NULL;
debug_ctx->event_tail = NULL;
debugger->debug_ctx = debug_ctx;
}
process->debugger = debugger;
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return 1;
}
/* a thread is exiting */
void debug_exit_thread( struct thread *thread )
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{
if (thread->debug_ctx) /* this thread is a debugger */
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{
/* kill all debugged processes */
kill_debugged_processes( thread, thread->exit_code );
release_object( thread->debug_ctx );
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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;
}
req->wait = 0;
if ((event = find_event_to_send( debug_ctx )))
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{
size_t size = get_req_data_size(req);
event->state = EVENT_SENT;
event->sender->debug_event = event;
req->pid = event->sender->process;
req->tid = event->sender;
if (size > sizeof(debug_event_t)) size = sizeof(debug_event_t);
memcpy( get_req_data(req), &event->data, size );
set_req_data_size( req, size );
}
else /* no event ready */
{
req->pid = 0;
req->tid = 0;
set_req_data_size( req, 0 );
if (req->get_handle)
req->wait = alloc_handle( current->process, debug_ctx, SYNCHRONIZE, FALSE );
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}
}
/* 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 debug_event_exception data;
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struct process *process = get_process_from_id( req->pid );
if (!process) return;
if (debugger_attach( process, current ))
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{
generate_startup_debug_events( process, NULL );
resume_process( process );
data.record.ExceptionCode = EXCEPTION_BREAKPOINT;
data.record.ExceptionFlags = EXCEPTION_CONTINUABLE;
data.record.ExceptionRecord = NULL;
data.record.ExceptionAddress = get_thread_ip( process->thread_list );
data.record.NumberParameters = 0;
data.first = 1;
generate_debug_event( process->thread_list, EXCEPTION_DEBUG_EVENT, &data );
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}
release_object( process );
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}
/* queue an exception event */
DECL_HANDLER(queue_exception_event)
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{
req->handle = 0;
if (current->process->debugger)
{
struct debug_event_exception data;
struct debug_event *event;
CONTEXT *context = get_req_data( req );
EXCEPTION_RECORD *rec = (EXCEPTION_RECORD *)(context + 1);
if (get_req_data_size( req ) < sizeof(*rec) + sizeof(*context))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
data.record = *rec;
data.first = req->first;
if ((event = alloc_debug_event( current, EXCEPTION_DEBUG_EVENT, &data, context )))
{
if ((req->handle = alloc_handle( current->process, event, SYNCHRONIZE, FALSE )))
{
link_event( event );
suspend_process( current->process );
}
release_object( event );
}
}
}
/* retrieve the status of an exception event */
DECL_HANDLER(get_exception_status)
{
struct debug_event *event;
size_t size = 0;
req->status = 0;
if ((event = (struct debug_event *)get_handle_obj( current->process, req->handle,
0, &debug_event_ops )))
{
if (event->state == EVENT_CONTINUED)
{
req->status = event->status;
if (current->context == &event->context)
{
size = min( sizeof(CONTEXT), get_req_data_size(req) );
memcpy( get_req_data(req), &event->context, size );
current->context = NULL;
}
}
else set_error( STATUS_PENDING );
release_object( event );
}
set_req_data_size( req, size );
}
/* send an output string to the debugger */
DECL_HANDLER(output_debug_string)
{
struct debug_event_output_string data;
data.string = req->string;
data.unicode = req->unicode;
data.length = req->length;
generate_debug_event( current, OUTPUT_DEBUG_STRING_EVENT, &data );
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}