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/* $OpenBSD: tfork_thread.S,v 1.7 2020/11/07 02:52:08 aoyama 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"
#define NOP or %r0, %r0, %r0
/*
* int __tfork_thread(const struct __tfork *param, size_t psize, void (*func)(void *), void *arg);
*/
ENTRY(__tfork_thread)
or %r13, %r0, __SYSCALLNAME(SYS_,__tfork)
tb0 0, %r0, 450 /* corrupts r2 and r3 in the child */
br CERROR
bcnd eq0, %r2, 1f
/*
* In parent process: just return.
*/
jmp %r1
1:
/*
* In child process: invoke function, then exit.
*/
jsr.n %r4 /* func */
or %r2, %r5, %r0 /* arg */
or %r13, %r0, __SYSCALLNAME(SYS_,__threxit)
tb0 0, %r0, 450
NOP
tb0 0, %r0, 130 /* breakpoint */
END(__tfork_thread)
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