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/* $OpenBSD: tfork_thread.S,v 1.6 2024/03/27 20:03:29 miod 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 "SYS.h"
/*
* int __tfork_thread(const struct __tfork *param, size_t psize, void (*func)(void *), void *arg);
* r4 r5 r6 r7
*/
ENTRY(__tfork_thread)
systrap SYS___tfork
bf 9f
tst r0, r0
bt 1f
/*
* In parent process: just return.
*/
rts
nop
systrap_data SYS___tfork
1:
/*
* In child process: invoke function, then exit.
*/
jsr @r6
mov r7, r4
systrap SYS___threxit
systrap_data SYS___threxit
9:
/*
* System call failure.
*/
SET_ERRNO_AND_RETURN(__tfork)
SET_ENTRY_SIZE(__tfork_thread)
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