1/*- 2 * Copyright (c) 2000 Peter Wemm <[email protected]> 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/* 29 * With thanks to John Dyson for the original version of this. 30 */ 31 32#include <SYS.h> 33 34/* 35 * 8 12 16 20 36 * rfork_thread(flags, stack_addr, start_fnc, start_arg); 37 * 38 * flags: Flags to rfork system call. See rfork(2). 39 * stack_addr: Top of stack for thread. 40 * start_fnc: Address of thread function to call in child. 41 * start_arg: Argument to pass to the thread function in child. 42 */ 43 44ENTRY(rfork_thread) 45 pushl %ebp 46 movl %esp, %ebp 47 pushl %esi 48 49 /* 50 * Push thread info onto the new thread's stack 51 */ 52 movl 12(%ebp), %esi # get stack addr 53 54 subl $4, %esi 55 movl 20(%ebp), %eax # get start argument 56 movl %eax, (%esi) 57 58 subl $4, %esi 59 movl 16(%ebp), %eax # get start thread address 60 movl %eax, (%esi) 61 62 /* 63 * Prepare and execute the thread creation syscall 64 */ 65 pushl 8(%ebp) 66 pushl $0 67 movl $SYS_rfork, %eax 68 KERNCALL 69 jb 2f 70 71 /* 72 * Check to see if we are in the parent or child 73 */ 74 cmpl $0, %edx 75 jnz 1f 76 addl $8, %esp 77 popl %esi 78 movl %ebp, %esp 79 popl %ebp 80 ret 81 .p2align 2 82 83 /* 84 * If we are in the child (new thread), then 85 * set-up the call to the internal subroutine. If it 86 * returns, then call __exit. 87 */ 881: 89 movl %esi,%esp 90 popl %eax 91 call *%eax 92 addl $4, %esp 93 94 /* 95 * Exit system call 96 */ 97 pushl %eax 98 pushl $0 99 movl $SYS_exit, %eax 100 KERNCALL 101 102 /* 103 * Branch here if the thread creation fails: 104 */ 1052: 106 addl $8, %esp 107 popl %esi 108 movl %ebp, %esp 109 popl %ebp 110 jmp HIDENAME(cerror) 111END(rfork_thread) 112 113 .section .note.GNU-stack,"",%progbits 114