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/* $OpenBSD: tfork_thread.S,v 1.7 2016/05/15 00:15:10 guenther Exp $ */
/*
* Copyright (c) 2005 Tim Wiess <tim@nop.cx>
*
* 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.h"
ENTRY(__tfork_thread)
/* call __tfork */
li %r0, SYS___tfork
sc
cmpwi %r0, 0
bne 1f
/* check if we are parent or child */
cmpwi %r3, 0
bnelr
/* child */
mtlr %r5 /* fp */
mr %r3, %r6 /* arg */
subi %r1, %r1, 16 /* fixup sp to get headroom */
blrl
/* child returned, call __threxit */
li %r0, SYS___threxit
sc
1:
stw 0, R2_OFFSET_ERRNO(%r2)
li %r3, -1
blr
END(__tfork_thread)
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