/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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.
*/
#include <SYS.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)
*/
movl %eax, (%edx) / mov it up for one arg
movl %edx, %esp / stack pointer at ret addr
movl %ebp, 4(%esp)
jmp _t_cancel
SET_SIZE(_ex_unwind_local)
/*
* _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.
*/
ENTRY(_ex_clnup_handler)
pushl %ebp / save current frame pointer
pushl 8(%esp) / first argument [arg]
movl (%ebp), %ebp / pop out one frame
call *16(%esp) / call handler [clnup]
addl $4, %esp
popl %eax / old frame pointer
lea 4(%eax), %esp / stk points to old frame
movl %ebp, 4(%esp) / _t_cancel() gets frame pointer arg
jmp _t_cancel
SET_SIZE(_ex_clnup_handler)
/*
* _thrp_unwind(void *arg)
*
* Ignore the argument; jump to _t_cancel(fp) with caller's fp
*/