1/*- 2 * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org> 3 * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD: src/lib/libc/amd64/gen/rfork_thread.S,v 1.2 2008/11/02 01:10:54 peter Exp $ 28 */ 29 30#include <machine/asm.h> 31 32/* 33 * With thanks to John Dyson for the original version of this. 34 */ 35 36#include <SYS.h> 37 38/* 39 * %edi %rsi %rdx %rcx 40 * rfork_thread(flags, stack_addr, start_fnc, start_arg); 41 * 42 * flags: Flags to rfork system call. See rfork(2). 43 * stack_addr: Top of stack for thread. 44 * start_fnc: Address of thread function to call in child. 45 * start_arg: Argument to pass to the thread function in child. 46 */ 47 48ENTRY(rfork_thread) 49 pushq %rbx 50 pushq %r12 51 movq %rdx, %rbx 52 movq %rcx, %r12 53 54 /* 55 * Prepare and execute the thread creation syscall 56 */ 57 movq $SYS_rfork, %rax 58 KERNCALL 59 jb 2f 60 61 /* 62 * Check to see if we are in the parent or child 63 */ 64 cmpl $0, %edx 65 jnz 1f 66 popq %r12 67 popq %rbx 68 ret 69 70 /* 71 * If we are in the child (new thread), then 72 * set-up the call to the internal subroutine. If it 73 * returns, then call __exit. 74 */ 751: 76 movq %rsi, %rsp 77 movq %r12, %rdi 78 call *%rbx 79 movl %eax, %edi 80 81 /* 82 * Exit system call 83 */ 84#ifdef SYS_exit 85 movq $SYS_exit, %rax 86#else 87 movq $SYS_sys_exit, %rax 88#endif 89 KERNCALL 90 91 /* 92 * Branch here if the thread creation fails: 93 */ 942: 95 popq %r12 96 popq %rbx 97#ifdef PIC 98 movq PIC_GOT(HIDENAME(cerror)), %rdx 99 jmp *%rdx 100#else 101 jmp HIDENAME(cerror) 102#endif 103END(rfork_thread) 104