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/* $OpenBSD: tfork_thread.S,v 1.4 2020/10/20 15:26:59 visa 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, size_t psize, void (*func)(void *), void *arg);
*/
FRAMESZ=4*REGSZ
GPOFF=FRAMESZ-2*REGSZ
LEAF(__tfork_thread, FRAMESZ)
/* a0 = param, a1 = psize, a2 = func, a3 = arg */
PTR_SUBU sp, FRAMESZ
SETUP_GP64(GPOFF, _C_LABEL(__tfork_thread))
.set reorder
move t1, a3 /* arg */
__DO_SYSCALL(__tfork)
bnez a3, 9f
beqz v0, 1f
RESTORE_GP64
PTR_ADDU sp, FRAMESZ
/*
* In parent process: just return.
*/
j ra
1:
/*
* In child process: invoke function, then exit.
*/
move t9, a2 /* func */
move a0, t1 /* arg */
move v0, zero
jal ra, t9
move a0, zero
__DO_SYSCALL(__threxit)
teq zero, zero, 0x52
9:
/*
* System call failure.
*/
LA t9, CERROR
RESTORE_GP64
PTR_ADDU sp, FRAMESZ
jr t9
END(__tfork_thread)
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