Sweden-Number/server/debugger.c

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/*
* Server-side debugger functions
*
* Copyright (C) 1999 Alexandre Julliard
*/
#include <assert.h>
#include <string.h>
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#include "winbase.h"
#include "winerror.h"
#include "handle.h"
#include "process.h"
#include "thread.h"
#include "request.h"
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struct debug_event
{
struct debug_event *next; /* event queue */
struct debug_event *prev;
struct thread *thread; /* thread which sent this event */
int sent; /* already sent to the debugger? */
int code; /* event code */
union debug_event_data data; /* event data */
};
struct debug_ctx
{
struct thread *owner; /* thread owning this debug context */
int waiting; /* is thread waiting for an event? */
struct timeout_user *timeout; /* timeout user for wait timeout */
struct debug_event *event_head; /* head of pending events queue */
struct debug_event *event_tail; /* tail of pending events queue */
};
/* size of the event data */
static const int event_sizes[] =
{
0,
sizeof(struct debug_event_exception), /* EXCEPTION_DEBUG_EVENT */
sizeof(struct debug_event_create_thread), /* CREATE_THREAD_DEBUG_EVENT */
sizeof(struct debug_event_create_process), /* CREATE_PROCESS_DEBUG_EVENT */
sizeof(struct debug_event_exit), /* EXIT_THREAD_DEBUG_EVENT */
sizeof(struct debug_event_exit), /* EXIT_PROCESS_DEBUG_EVENT */
sizeof(struct debug_event_load_dll), /* LOAD_DLL_DEBUG_EVENT */
sizeof(struct debug_event_unload_dll), /* UNLOAD_DLL_DEBUG_EVENT */
sizeof(struct debug_event_output_string), /* OUTPUT_DEBUG_STRING_EVENT */
sizeof(struct debug_event_rip_info) /* RIP_EVENT */
};
/* initialise the fields that do not need to be filled by the client */
static int fill_debug_event( struct thread *debugger, struct thread *thread,
struct debug_event *event )
{
int handle;
/* some events need special handling */
switch(event->code)
{
case CREATE_THREAD_DEBUG_EVENT:
if ((event->data.create_thread.handle = alloc_handle( debugger->process, thread,
THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME, FALSE )) == -1)
return 0;
break;
case CREATE_PROCESS_DEBUG_EVENT:
if ((handle = event->data.create_process.file) != -1)
{
if ((handle = duplicate_handle( thread->process, handle, debugger->process,
GENERIC_READ, FALSE, 0 )) == -1)
return 0;
event->data.create_process.file = handle;
}
if ((event->data.create_process.process = alloc_handle( debugger->process, thread->process,
PROCESS_VM_READ | PROCESS_VM_WRITE, FALSE )) == -1)
{
if (handle != -1) close_handle( debugger->process, handle );
return 0;
}
if ((event->data.create_process.thread = alloc_handle( debugger->process, thread,
THREAD_GET_CONTEXT | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME, FALSE )) == -1)
{
if (handle != -1) close_handle( debugger->process, handle );
close_handle( debugger->process, event->data.create_process.process );
return 0;
}
break;
case LOAD_DLL_DEBUG_EVENT:
if ((handle = event->data.load_dll.handle) != -1)
{
if ((handle = duplicate_handle( thread->process, handle, debugger->process,
GENERIC_READ, FALSE, 0 )) == -1)
return 0;
event->data.load_dll.handle = handle;
}
break;
}
return 1;
}
/* free a debug event structure */
static void free_event( struct debug_event *event )
{
switch(event->code)
{
case CREATE_THREAD_DEBUG_EVENT:
close_handle( event->thread->process, event->data.create_thread.handle );
break;
case CREATE_PROCESS_DEBUG_EVENT:
if (event->data.create_process.file != -1)
close_handle( event->thread->process, event->data.create_process.file );
close_handle( event->thread->process, event->data.create_process.thread );
close_handle( event->thread->process, event->data.create_process.process );
break;
case LOAD_DLL_DEBUG_EVENT:
if (event->data.load_dll.handle != -1)
close_handle( event->thread->process, event->data.load_dll.handle );
break;
}
event->thread->debug_event = NULL;
release_object( event->thread );
free( event );
}
/* 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;
}
/* link an event at the end of the queue */
static void link_event( struct debug_ctx *debug_ctx, struct debug_event *event )
{
event->next = NULL;
event->prev = debug_ctx->event_tail;
if (event->prev) event->prev->next = event;
else debug_ctx->event_head = event;
debug_ctx->event_tail = event;
}
/* send the first queue event as a reply */
static void build_event_reply( struct debug_ctx *debug_ctx )
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{
struct debug_event *event = debug_ctx->event_head;
struct thread *thread = event->thread;
struct wait_debug_event_request *req = get_req_ptr( debug_ctx->owner );
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assert( event );
assert( debug_ctx->waiting );
unlink_event( debug_ctx, event );
event->sent = 1;
req->code = event->code;
req->pid = thread->process;
req->tid = thread;
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debug_ctx->waiting = 0;
if (debug_ctx->timeout)
{
remove_timeout_user( debug_ctx->timeout );
debug_ctx->timeout = NULL;
}
debug_ctx->owner->error = 0;
memcpy( req + 1, &event->data, event_sizes[event->code] );
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}
/* timeout callback while waiting for a debug event */
static void wait_event_timeout( void *ctx )
{
struct debug_ctx *debug_ctx = (struct debug_ctx *)ctx;
struct wait_debug_event_request *req = get_req_ptr( debug_ctx->owner );
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assert( debug_ctx->waiting );
req->code = 0;
req->pid = 0;
req->tid = 0;
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debug_ctx->waiting = 0;
debug_ctx->timeout = NULL;
debug_ctx->owner->error = WAIT_TIMEOUT;
send_reply( debug_ctx->owner );
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}
/* wait for a debug event (or send a reply at once if one is pending) */
static int wait_for_debug_event( int timeout )
{
struct debug_ctx *debug_ctx = current->debug_ctx;
struct timeval when;
if (!debug_ctx) /* current thread is not a debugger */
{
set_error( ERROR_ACCESS_DENIED ); /* FIXME */
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return 0;
}
assert( !debug_ctx->waiting );
if (debug_ctx->event_head) /* already have a pending event */
{
debug_ctx->waiting = 1;
build_event_reply( debug_ctx );
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return 1;
}
if (!timeout) /* no event and we don't want to wait */
{
set_error( WAIT_TIMEOUT );
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return 0;
}
if (timeout != -1) /* start the timeout */
{
make_timeout( &when, timeout );
if (!(debug_ctx->timeout = add_timeout_user( &when, wait_event_timeout, debug_ctx )))
return 0;
}
debug_ctx->waiting = 1;
current->state = SLEEPING;
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return 1;
}
/* continue a debug event */
static int continue_debug_event( struct process *process, struct thread *thread, int status )
{
struct debug_event *event = thread->debug_event;
if (process->debugger != current || !event || !event->sent)
{
/* not debugging this process, or no event pending */
set_error( ERROR_ACCESS_DENIED ); /* FIXME */
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return 0;
}
if (thread->state != TERMINATED)
{
/* only send a reply if the thread is still there */
/* (we can get a continue on an exit thread/process event) */
struct send_debug_event_request *req = get_req_ptr( thread );
req->status = status;
send_reply( thread );
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}
free_event( event );
resume_process( process );
return 1;
}
/* queue a debug event for a debugger */
static struct debug_event *queue_debug_event( struct thread *debugger, struct thread *thread,
int code, void *data )
{
struct debug_ctx *debug_ctx = debugger->debug_ctx;
struct debug_event *event;
assert( debug_ctx );
/* cannot queue a debug event for myself */
assert( debugger->process != thread->process );
/* build the event */
if (!(event = mem_alloc( sizeof(*event) - sizeof(event->data) + event_sizes[code] )))
return NULL;
event->sent = 0;
event->code = code;
event->thread = (struct thread *)grab_object( thread );
memcpy( &event->data, data, event_sizes[code] );
if (!fill_debug_event( debugger, thread, event ))
{
release_object( event->thread );
free( event );
return NULL;
}
if (thread->debug_event)
{
/* only exit events can replace others */
assert( code == EXIT_THREAD_DEBUG_EVENT || code == EXIT_PROCESS_DEBUG_EVENT );
if (!thread->debug_event->sent) unlink_event( debug_ctx, thread->debug_event );
free_event( thread->debug_event );
}
link_event( debug_ctx, event );
thread->debug_event = event;
suspend_process( thread->process );
if (debug_ctx->waiting)
{
build_event_reply( debug_ctx );
send_reply( debug_ctx->owner );
}
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return event;
}
/* attach a process to a debugger thread */
int debugger_attach( struct process *process, struct thread *debugger )
{
struct debug_ctx *debug_ctx;
struct thread *thread;
if (process->debugger) /* already being debugged */
{
set_error( ERROR_ACCESS_DENIED );
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return 0;
}
/* make sure we don't create a debugging loop */
for (thread = debugger; thread; thread = thread->process->debugger)
if (thread->process == process)
{
set_error( ERROR_ACCESS_DENIED );
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return 0;
}
if (!debugger->debug_ctx) /* need to allocate a context */
{
assert( !debugger->debug_first );
if (!(debug_ctx = mem_alloc( sizeof(*debug_ctx) ))) return 0;
debug_ctx->owner = current;
debug_ctx->waiting = 0;
debug_ctx->timeout = NULL;
debug_ctx->event_head = NULL;
debug_ctx->event_tail = NULL;
debugger->debug_ctx = debug_ctx;
}
process->debugger = debugger;
process->debug_prev = NULL;
process->debug_next = debugger->debug_first;
debugger->debug_first = process;
return 1;
}
/* detach a process from its debugger thread */
static void debugger_detach( struct process *process )
{
struct thread *debugger = process->debugger;
assert( debugger );
if (process->debug_next) process->debug_next->debug_prev = process->debug_prev;
if (process->debug_prev) process->debug_prev->debug_next = process->debug_next;
else debugger->debug_first = process;
process->debugger = NULL;
}
/* a thread is exiting */
void debug_exit_thread( struct thread *thread, int exit_code )
{
struct thread *debugger = current->process->debugger;
struct debug_ctx *debug_ctx = thread->debug_ctx;
if (debugger) /* being debugged -> send an event to the debugger */
{
struct debug_event_exit event;
event.exit_code = exit_code;
if (!thread->proc_next && !thread->proc_prev)
{
assert( thread->process->thread_list == thread );
/* this is the last thread, send an exit process event and cleanup */
queue_debug_event( debugger, current, EXIT_PROCESS_DEBUG_EVENT, &event );
debugger_detach( thread->process );
}
else queue_debug_event( debugger, current, EXIT_THREAD_DEBUG_EVENT, &event );
}
if (debug_ctx) /* this thread is a debugger */
{
struct debug_event *event;
/* kill all debugged processes */
while (thread->debug_first) kill_process( thread->debug_first, exit_code );
/* free all pending events */
while ((event = debug_ctx->event_head) != NULL)
{
unlink_event( debug_ctx, event );
free_event( event );
}
/* remove the timeout */
if (debug_ctx->timeout) remove_timeout_user( debug_ctx->timeout );
thread->debug_ctx = NULL;
free( debug_ctx );
}
}
/* Wait for a debug event */
DECL_HANDLER(wait_debug_event)
{
if (!wait_for_debug_event( req->timeout ))
{
req->code = 0;
req->pid = NULL;
req->tid = NULL;
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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 process *process = get_process_from_id( req->pid );
if (process)
{
debugger_attach( process, current );
/* FIXME: should notice the debugged process somehow */
release_object( process );
}
}
/* Send a debug event */
DECL_HANDLER(send_debug_event)
{
struct thread *debugger = current->process->debugger;
assert( !current->debug_event );
if ((req->code <= 0) || (req->code > RIP_EVENT))
{
fatal_protocol_error( current, "send_debug_event: bad code %d\n", req->code );
return;
}
req->status = 0;
if (debugger && queue_debug_event( debugger, current, req->code, req + 1 ))
{
/* wait for continue_debug_event */
current->state = SLEEPING;
}
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}