unwind_frame.s revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
.file "%M%"
#include "SYS.h"
#include <../assym.h>
/* Cancellation/thr_exit() stuff */
/*
* _ex_unwind_local(void)
*
* Called only from _t_cancel().
* Unwind two frames and invoke _t_cancel(fp) again.
*
* Before this the call stack is: f4 f3 f2 f1 _t_cancel
* After this the call stack is: f4 f3 f2 _t_cancel
* (as if "call f1" is replaced by "call _t_cancel(fp)" in f2)
*/
/*
* _ex_clnup_handler(void *arg, void (*clnup)(void *))
*
* Called only from _t_cancel().
* Unwind one frame, call the cleanup handler with argument arg from the
* restored frame, then jump to _t_cancel(fp) again from the restored frame.
*/
jmpl %o1, %o7 ! invoke func with arg
nop ! and return here
ldn [%g7 + UL_UNWIND_RET], %o7 ! restore return address
ba _t_cancel ! tailcall _t_cancel(fp)
mov %fp, %o0 ! passing the frame pointer
SET_SIZE(_ex_clnup_handler)
/*
* _thrp_unwind(void *arg)
*
* Ignore the argument; jump to _t_cancel(fp) with caller's fp
*/