1/*- 2 * Copyright (c) 2000 Peter Wemm <[email protected]> 3 * Copyright (c) 2003 Alan L. Cox <[email protected]> 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 28#include <machine/asm.h> 29/* 30 * With thanks to John Dyson for the original version of this. 31 */ 32 33#include <SYS.h> 34 35/* 36 * %edi %rsi %rdx %rcx 37 * rfork_thread(flags, stack_addr, start_fnc, start_arg); 38 * 39 * flags: Flags to rfork system call. See rfork(2). 40 * stack_addr: Top of stack for thread. 41 * start_fnc: Address of thread function to call in child. 42 * start_arg: Argument to pass to the thread function in child. 43 */ 44 45ENTRY(rfork_thread) 46 pushq %rbx 47 pushq %r12 48 movq %rdx, %rbx 49 movq %rcx, %r12 50 51 /* 52 * Prepare and execute the thread creation syscall 53 */ 54 movq $SYS_rfork, %rax 55 KERNCALL 56 jb 2f 57 58 /* 59 * Check to see if we are in the parent or child 60 */ 61 cmpl $0, %edx 62 jnz 1f 63 popq %r12 64 popq %rbx 65 ret 66 67 /* 68 * If we are in the child (new thread), then 69 * set-up the call to the internal subroutine. If it 70 * returns, then call __exit. 71 */ 721: 73 movq %rsi, %rsp 74 movq %r12, %rdi 75 call *%rbx 76 movl %eax, %edi 77 78 /* 79 * Exit system call 80 */ 81 movq $SYS_exit, %rax 82 KERNCALL 83 84 /* 85 * Branch here if the thread creation fails: 86 */ 872: 88 popq %r12 89 popq %rbx 90 jmp HIDENAME(cerror) 91END(rfork_thread) 92 93 .section .note.GNU-stack,"",%progbits 94