src/libthread/OpenBSD-386-asm.s

#include "FreeBSD-386-asm.s"

/*
 * 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 <sys/syscall.h>
#include <machine/asm.h>

ENTRY(rfork_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_rfork, %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_exit, %eax
	int     $0x80

	/*
	* Branch here if the thread creation fails:
	*/
2:
	addl    $8, %esp
	popl    %esi
	movl    %ebp, %esp
	popl    %ebp
	PIC_PROLOGUE
	jmp     PIC_PLT(_C_LABEL(__cerror))