bsd_kern.c   [plain text]

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
#include <mach/mach_types.h>
#include <kern/queue.h>
#include <kern/ast.h>
#include <kern/thread.h>
#include <kern/thread_act.h>
#include <kern/task.h>
#include <kern/spl.h>
#include <kern/lock.h>
#include <vm/vm_map.h>
#include <vm/pmap.h>
#include <ipc/ipc_port.h>
#include <ipc/ipc_object.h>

#undef thread_should_halt
#undef ipc_port_release

decl_simple_lock_data(extern,reaper_lock)
extern queue_head_t           reaper_queue;

/* BSD KERN COMPONENT INTERFACE */

task_t	bsd_init_task = TASK_NULL;
char	init_task_failure_data[1024];
 
thread_act_t get_firstthread(task_t);
vm_map_t  get_task_map(task_t);
ipc_space_t  get_task_ipcspace(task_t);
boolean_t is_kerneltask(task_t);
boolean_t is_thread_idle(thread_t);
boolean_t is_thread_running(thread_act_t);
thread_shuttle_t getshuttle_thread( thread_act_t);
thread_act_t getact_thread( thread_shuttle_t);
vm_offset_t get_map_min( vm_map_t);
vm_offset_t get_map_max( vm_map_t);
int get_task_userstop(task_t);
int get_thread_userstop(thread_act_t);
boolean_t thread_should_abort(thread_shuttle_t);
boolean_t current_thread_aborted(void);
void task_act_iterate_wth_args(task_t, void(*)(thread_act_t, void *), void *);
void ipc_port_release(ipc_port_t);
boolean_t is_thread_active(thread_t);
kern_return_t get_thread_waitresult(thread_t);
vm_size_t get_vmmap_size(vm_map_t);
int get_vmmap_entries(vm_map_t);
int  get_task_numacts(task_t);
thread_act_t get_firstthread(task_t task);
kern_return_t get_signalact(task_t , thread_act_t *, thread_t *, int);
void astbsd_on(void);

/*
 *
 */
void  *get_bsdtask_info(task_t t)
{
	return(t->bsd_info);
}

/*
 *
 */
void set_bsdtask_info(task_t t,void * v)
{
	t->bsd_info=v;
}

/*
 *
 */
void *get_bsdthread_info(thread_act_t th)
{
	return(th->uthread);
}

/*
 * XXX: wait for BSD to  fix signal code
 * Until then, we cannot block here.  We know the task
 * can't go away, so we make sure it is still active after
 * retrieving the first thread for extra safety.
 */
thread_act_t get_firstthread(task_t task)
{
	thread_act_t	thr_act;

	thr_act = (thread_act_t)queue_first(&task->thr_acts);
	if (thr_act == (thread_act_t)&task->thr_acts)
		thr_act = THR_ACT_NULL;
	if (!task->active)
		return(THR_ACT_NULL);
	return(thr_act);
}

kern_return_t get_signalact(task_t task,thread_act_t * thact, thread_t * thshut, int setast)
{

        thread_act_t inc;
        thread_act_t ninc;
        thread_act_t thr_act;
	thread_t	th;

	task_lock(task);
	if (!task->active) {
		task_unlock(task);
		return(KERN_FAILURE);
	}

        thr_act = THR_ACT_NULL;
        for (inc  = (thread_act_t)queue_first(&task->thr_acts);
             inc != (thread_act_t)&task->thr_acts;
             inc  = ninc) {
                th = act_lock_thread(inc);
                if ((inc->active)  && 
                    ((th->state & (TH_ABORT|TH_ABORT_SAFELY)) != TH_ABORT)) {
                    thr_act = inc;
                   break;
                }
                act_unlock_thread(inc);
                ninc = (thread_act_t)queue_next(&inc->thr_acts);
        }
out:
        if (thact) 
                *thact = thr_act;

        if (thshut)
                *thshut = thr_act? thr_act->thread: THREAD_NULL ;
        if (thr_act) {
                if (setast)
                    act_set_astbsd(thr_act);

                act_unlock_thread(thr_act);
        }
	task_unlock(task);

        if (thr_act) 
            return(KERN_SUCCESS);
        else 
            return(KERN_FAILURE);
}


kern_return_t check_actforsig(task_t task, thread_act_t thact, thread_t * thshut, int setast)
{

        thread_act_t inc;
        thread_act_t ninc;
        thread_act_t thr_act;
		thread_t	th;
		int found=0;

	task_lock(task);
	if (!task->active) {
		task_unlock(task);
		return(KERN_FAILURE);
	}

        thr_act = THR_ACT_NULL;
        for (inc  = (thread_act_t)queue_first(&task->thr_acts);
             inc != (thread_act_t)&task->thr_acts;
             inc  = ninc) {

				if (inc != thact) {
                	ninc = (thread_act_t)queue_next(&inc->thr_acts);
						continue;
				}
                th = act_lock_thread(inc);
                if ((inc->active)  && 
                    ((th->state & (TH_ABORT|TH_ABORT_SAFELY)) != TH_ABORT)) {
					found = 1;
                    thr_act = inc;
                   break;
                }
                act_unlock_thread(inc);
                /* ninc = (thread_act_t)queue_next(&inc->thr_acts); */
				break;
        }
out:
		if (found) {
        	if (thshut)
                	*thshut = thr_act? thr_act->thread: THREAD_NULL ;
            if (setast)
				act_set_astbsd(thr_act);

           act_unlock_thread(thr_act);
        }
		task_unlock(task);

        if (found) 
            return(KERN_SUCCESS);
        else 
            return(KERN_FAILURE);
}

/*
 *
 */
vm_map_t  get_task_map(task_t t)
{
	return(t->map);
}

/*
 *
 */
ipc_space_t  get_task_ipcspace(task_t t)
{
	return(t->itk_space);
}

int  get_task_numacts(task_t t)
{
	return(t->thr_act_count);
}


/* does this machine need  64bit register set for signal handler */
int is_64signalregset(void)
{
	task_t t = current_task();
	if(t->taskFeatures[0] & tf64BitData)
		return(1);
	else
		return(0);
}

/*
 * Reset the current task's map by taking a reference
 * on the new map.  The old map reference is returned.
 */
vm_map_t
swap_task_map(task_t task,vm_map_t map)
{
	vm_map_t old_map;

	vm_map_reference(map);
	task_lock(task);
	old_map = task->map;
	task->map = map;
	task_unlock(task);
	return old_map;
}

/*
 * Reset the current act map.
 * The caller donates us a reference to the new map
 * and we donote our reference to the old map to him.
 */
vm_map_t
swap_act_map(thread_act_t thr_act,vm_map_t map)
{
	vm_map_t old_map;

	act_lock(thr_act);
	old_map = thr_act->map;
	thr_act->map = map;
	act_unlock(thr_act);
	return old_map;
}

/*
 *
 */
pmap_t  get_task_pmap(task_t t)
{
	return(t->map->pmap);
}

/*
 *
 */
pmap_t  get_map_pmap(vm_map_t map)
{
	return(map->pmap);
}
/*
 *
 */
task_t	get_threadtask(thread_act_t th)
{
	return(th->task);
}


/*
 *
 */
boolean_t is_thread_idle(thread_t th)
{
	return((th->state & TH_IDLE) == TH_IDLE);
}

/*
 *
 */
boolean_t is_thread_running(thread_act_t thact)
{
	thread_t th = thact->thread;
	return((th->state & TH_RUN) == TH_RUN);
}

/*
 *
 */
thread_shuttle_t
getshuttle_thread(
	thread_act_t	th)
{
#ifdef	DEBUG
	assert(th->thread);
#endif
	return(th->thread);
}

/*
 *
 */
thread_act_t
getact_thread(
	thread_shuttle_t	th)
{
#ifdef	DEBUG
	assert(th->top_act);
#endif
	return(th->top_act);
}

/*
 *
 */
vm_offset_t
get_map_min(
	vm_map_t	map)
{
	return(vm_map_min(map));
}

/*
 *
 */
vm_offset_t
get_map_max(
	vm_map_t	map)
{
	return(vm_map_max(map));
}
vm_size_t
get_vmmap_size(
	vm_map_t	map)
{
	return(map->size);
}

int
get_vmsubmap_entries(
	vm_map_t	map,
	vm_object_offset_t	start,
	vm_object_offset_t	end)
{
	int	total_entries = 0;
	vm_map_entry_t	entry;

	vm_map_lock(map);
	entry = vm_map_first_entry(map);
	while((entry != vm_map_to_entry(map)) && (entry->vme_start < start)) {
		entry = entry->vme_next;
	}

	while((entry != vm_map_to_entry(map)) && (entry->vme_start < end)) {
		if(entry->is_sub_map) {
			total_entries += 	
				get_vmsubmap_entries(entry->object.sub_map, 
					entry->offset, 
					entry->offset + 
					(entry->vme_end - entry->vme_start));
		} else {
			total_entries += 1;
		}
		entry = entry->vme_next;
	}
	vm_map_unlock(map);
	return(total_entries);
}

int
get_vmmap_entries(
	vm_map_t	map)
{
	int	total_entries = 0;
	vm_map_entry_t	entry;

	vm_map_lock(map);
	entry = vm_map_first_entry(map);

	while(entry != vm_map_to_entry(map)) {
		if(entry->is_sub_map) {
			total_entries += 	
				get_vmsubmap_entries(entry->object.sub_map, 
					entry->offset, 
					entry->offset + 
					(entry->vme_end - entry->vme_start));
		} else {
			total_entries += 1;
		}
		entry = entry->vme_next;
	}
	vm_map_unlock(map);
	return(total_entries);
}

/*
 *
 */
/*
 *
 */
int
get_task_userstop(
	task_t task)
{
	return(task->user_stop_count);
}

/*
 *
 */
int
get_thread_userstop(
	thread_act_t th)
{
	return(th->user_stop_count);
}

/*
 *
 */
boolean_t
thread_should_abort(
	thread_shuttle_t th)
{
	return(!th->top_act || !th->top_act->active || 
	       (th->state & (TH_ABORT|TH_ABORT_SAFELY)) == TH_ABORT);
}

/*
 * This routine is like thread_should_abort() above.  It checks to
 * see if the current thread is aborted.  But unlike above, it also
 * checks to see if thread is safely aborted.  If so, it returns
 * that fact, and clears the condition (safe aborts only should
 * have a single effect, and a poll of the abort status
 * qualifies.
 */
boolean_t
current_thread_aborted (
		void)
{
	thread_t th = current_thread();
	spl_t s;

	if (!th->top_act || 
		((th->state & (TH_ABORT|TH_ABORT_SAFELY)) == TH_ABORT &&
		 th->interrupt_level != THREAD_UNINT))
		return (TRUE);
	if (th->state & TH_ABORT_SAFELY) {
		s = splsched();
		thread_lock(th);
		if (th->state & TH_ABORT_SAFELY)
			th->state &= ~(TH_ABORT|TH_ABORT_SAFELY);
		thread_unlock(th);
		splx(s);
	}
	return FALSE;
}

/*
 *
 */
void
task_act_iterate_wth_args(
	task_t task,
	void (*func_callback)(thread_act_t, void *),
	void *func_arg)
{
        thread_act_t inc, ninc;

	task_lock(task);
        for (inc  = (thread_act_t)queue_first(&task->thr_acts);
             inc != (thread_act_t)&task->thr_acts;
             inc  = ninc) {
                ninc = (thread_act_t)queue_next(&inc->thr_acts);
                (void) (*func_callback)(inc, func_arg);
        }
	task_unlock(task);
}

void
ipc_port_release(
	ipc_port_t port)
{
	ipc_object_release(&(port)->ip_object);
}

boolean_t
is_thread_active(
	thread_shuttle_t th)
{
	return(th->active);
}

kern_return_t
get_thread_waitresult(
	thread_shuttle_t th)
{
	return(th->wait_result);
}

void
astbsd_on(void)
{
	boolean_t	reenable;

	reenable = ml_set_interrupts_enabled(FALSE);
	ast_on_fast(AST_BSD);
	(void)ml_set_interrupts_enabled(reenable);
}