ref: 00c219c7d9c2b9f60c2db0e1ba7289b2301209a7
dir: /emu/OpenBSD/rfork_thread.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. */ /* * 8 12 16 20 * rfork_thread(flags, stack_addr, start_fnc, start_arg); * * flags: Flags to rfork system call. See rfork(2). * 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(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_threxit, %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))