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/* $OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:56 guenther Exp $ */
/*
* Copyright (c) 2005, Miodrag Vallat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "SYS.h"
/*
* int __tfork_thread(const struct __tfork *param, void *stack, void (*func)(void *), void *arg);
*/
ENTRY(__tfork_thread)
mov %o1, %o4 /* save stack */
/*
* We can not invoke __tfork as a G2-style system call since we want
* different return paths.
*/
mov SYS___tfork, %g1
t ST_SYSCALL
bcs 9f
nop
cmp %o0, 0
be 1f
nop
/*
* In parent process: just return.
*/
retl
nop
1:
/*
* In child process: switch stack, invoke function, then exit.
*/
mov %g0, %fp /* clear frame pointer */
sub %o4, (BIAS + CC64FSZ), %sp /* stack */
call %o2 /* func */
mov %o3, %o0 /* arg */
mov SYS___threxit, %g1
clr %o0
t ST_SYSCALL /* will not return */
9:
/*
* System call failure.
*/
ERROR()
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