1/*- 2 * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <machine/asm.h> 28__FBSDID("$FreeBSD: releng/10.2/lib/libc/i386/gen/rfork_thread.S 240152 2012-09-05 21:41:05Z jilles $"); 29 30/* 31 * With thanks to John Dyson for the original version of this. 32 */ 33 34#include <SYS.h> 35 36/* 37 * 8 12 16 20 38 * rfork_thread(flags, stack_addr, start_fnc, start_arg); 39 * 40 * flags: Flags to rfork system call. See rfork(2). 41 * stack_addr: Top of stack for thread. 42 * start_fnc: Address of thread function to call in child. 43 * start_arg: Argument to pass to the thread function in child. 44 */ 45 46ENTRY(rfork_thread) 47 pushl %ebp 48 movl %esp, %ebp 49 pushl %esi 50 51 /* 52 * Push thread info onto the new thread's stack 53 */ 54 movl 12(%ebp), %esi # get stack addr 55 56 subl $4, %esi 57 movl 20(%ebp), %eax # get start argument 58 movl %eax, (%esi) 59 60 subl $4, %esi 61 movl 16(%ebp), %eax # get start thread address 62 movl %eax, (%esi) 63 64 /* 65 * Prepare and execute the thread creation syscall 66 */ 67 pushl 8(%ebp) 68 pushl $0 69 movl $SYS_rfork, %eax 70 KERNCALL 71 jb 2f 72 73 /* 74 * Check to see if we are in the parent or child 75 */ 76 cmpl $0, %edx 77 jnz 1f 78 addl $8, %esp 79 popl %esi 80 movl %ebp, %esp 81 popl %ebp 82 ret 83 .p2align 2 84 85 /* 86 * If we are in the child (new thread), then 87 * set-up the call to the internal subroutine. If it 88 * returns, then call __exit. 89 */ 901: 91 movl %esi,%esp 92 popl %eax 93 call *%eax 94 addl $4, %esp 95 96 /* 97 * Exit system call 98 */ 99 pushl %eax 100 pushl $0 101#ifdef SYS_exit 102 movl $SYS_exit, %eax 103#else 104 movl $SYS_sys_exit, %eax 105#endif 106 KERNCALL 107 108 /* 109 * Branch here if the thread creation fails: 110 */ 1112: 112 addl $8, %esp 113 popl %esi 114 movl %ebp, %esp 115 popl %ebp 116 jmp HIDENAME(cerror) 117END(rfork_thread) 118 119 .section .note.GNU-stack,"",%progbits 120