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/* $OpenBSD: rfork_thread.S,v 1.3 2011/10/17 06:39:20 guenther Exp $ */
/*
* Copyright (c) 2005 Dale Rahn <drahn@openbsd.org>
*
* 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 and this permission notice 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 <sys/syscall.h>
#include <machine/asm.h>
#include "../../../libc/arch/arm/SYS.h"
/*
* r0 r1 r2 r3
* __tfork_thread(param, stack_addr, start_fnc, start_arg);
*/
ENTRY(__tfork_thread)
stmdb sp!, {r4}
mov r4, r1
SYSTRAP(__tfork)
bcs 1f
/* check if we are parent or child */
cmp r0, #0
ldmneia sp!, {r4}
movne pc, lr
/* child */
mov sp, r4
mov r0, r3
mov lr, pc
mov pc, r2
nop
SYSTRAP(threxit)
1:
ldmia sp!, {r4}
b PIC_SYM(CERROR, PLT)
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