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/* $OpenBSD: rfork_thread.S,v 1.2 2011/10/17 06:39:20 guenther Exp $ */
/*
* Copyright (c) 2007 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice, this permission notice, and the disclaimer below
* appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "../../../libc/arch/sh/SYS.h"
/*
* int __tfork_thread(const struct __tfork *param, void *stack, void (*func)(void *), void *arg);
* r4 r5 r6 r7
*/
ENTRY(__tfork_thread)
mov.l .LSYS___tfork, r0
.word 0xc380 /* trapa #0x80 */
bf 9f
tst r0, r0
bt 1f
/*
* In parent process: just return.
*/
rts
nop
1:
/*
* In child process: switch stack, invoke function, then exit.
*/
mov r5, sp
jsr @r6
mov r7, r4
mov.l .LSYS_threxit, r0
.word 0xc380 /* trapa #0x80 */
9:
/*
* System call failure.
*/
JUMP_CERROR
.align 2
.LSYS___tfork: .long SYS___tfork
.LSYS_threxit: .long SYS_threxit
SET_ENTRY_SIZE(__tfork_thread)
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