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/* $OpenBSD: rfork_thread.S,v 1.1 2005/12/24 12:01:26 miod 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 "../../../libc/arch/mips64/SYS.h"
/*
* int rfork_thread(int flags, void *stack, void (*func)(void *), void *arg);
*/
LEAF(rfork_thread, 32)
/* a0 = flags, a1 = stack, a2 = func, a3 = arg */
PTR_SUBU sp, 32
SETUP_GP64(16, _C_LABEL(rfork_thread))
move t0, a1 /* stack */
move t1, a3 /* arg */
__DO_SYSCALL(rfork)
bnez a3, 9f
RESTORE_GP64
PTR_ADDU sp, 32
beqz v0, 1f
/*
* In parent process: just return.
*/
j ra
nop
1:
/*
* In child process: switch stack, invoke function, then exit.
*/
move sp, t0 /* stack */
move t9, a2 /* func */
move a0, t1 /* arg */
jal ra, t9
move v0, zero
move a0, zero
__DO_SYSCALL(threxit)
9:
/*
* System call failure.
*/
LA t9, _C_LABEL(cerror)
RESTORE_GP64
PTR_ADDU sp, 32
jr t9
nop
END(rfork_thread)
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