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/* $OpenBSD: rfork_thread.S,v 1.5 2012/01/17 02:34:18 guenther Exp $ */
/*-
* Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <machine/asm.h>
#if 0
__FBSDID("$FreeBSD: /repoman/r/ncvs/src/lib/libc/i386/gen/rfork_thread.S,v 1.5 2003/05/07 17:23:25 jhb Exp $");
#endif
/*
* With thanks to John Dyson for the original version of this.
*/
#include "../../../libc/arch/i386/SYS.h"
/*
* 8 12 16 20
* __tfork_thread(param, stack_addr, start_fnc, start_arg);
*
* param: Arguments to actual system call.
* stack_addr: Top of stack for thread.
* start_fnc: Address of thread function to call in child.
* start_arg: Argument to pass to the thread function in child.
*/
ENTRY(__tfork_thread)
pushl %ebp
movl %esp, %ebp
pushl %esi
/*
* Push thread info onto the new thread's stack
*/
movl 12(%ebp), %esi # get stack addr
subl $4, %esi
movl 20(%ebp), %eax # get start argument
movl %eax, (%esi)
subl $4, %esi
movl 16(%ebp), %eax # get start thread address
movl %eax, (%esi)
/*
* Prepare and execute the thread creation syscall
*/
pushl 8(%ebp)
pushl $0
movl $SYS___tfork, %eax
int $0x80
jb 2f
/*
* Check to see if we are in the parent or child
*/
cmpl $0, %edx
jnz 1f
addl $8, %esp
popl %esi
movl %ebp, %esp
popl %ebp
ret
.p2align 2
/*
* If we are in the child (new thread), then
* set-up the call to the internal subroutine. If it
* returns, then call __exit.
*/
1:
movl %esi,%esp
popl %eax
call *%eax
addl $4, %esp
/*
* Exit system call
*/
pushl %eax
pushl $0
movl $SYS___threxit, %eax
int $0x80
/*
* Branch here if the thread creation fails:
*/
2:
addl $8, %esp
popl %esi
movl %ebp, %esp
popl %ebp
#ifdef PIC
PIC_PROLOGUE
movl PIC_GOT(CERROR), %ecx
PIC_EPILOGUE
jmp *%ecx
#else
jmp CERROR
#endif
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