2 * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
3 * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * $FreeBSD: src/lib/libc/amd64/gen/rfork_thread.S,v 1.2 2008/11/02 01:10:54 peter Exp $
28 * $DragonFly: src/lib/libc/amd64/gen/rfork_thread.S,v 1.1 2004/02/02 05:43:14 dillon Exp $
31 #include <machine/asm.h>
34 * With thanks to John Dyson for the original version of this.
41 * rfork_thread(flags, stack_addr, start_fnc, start_arg);
43 * flags: Flags to rfork system call. See rfork(2).
44 * stack_addr: Top of stack for thread.
45 * start_fnc: Address of thread function to call in child.
46 * start_arg: Argument to pass to the thread function in child.
56 * Prepare and execute the thread creation syscall
63 * Check to see if we are in the parent or child
72 * If we are in the child (new thread), then
73 * set-up the call to the internal subroutine. If it
74 * returns, then call __exit.
88 movq $SYS_sys_exit, %rax
93 * Branch here if the thread creation fails:
99 movq PIC_GOT(HIDENAME(cerror)), %rdx