projects / dragonfly.git / blame
| Commit | Line | Data |
|---|---|---|
| 17030342 MD |
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 | * | |
| eb9f4715 | 27 | * $FreeBSD: src/lib/libc/amd64/gen/rfork_thread.S,v 1.2 2008/11/02 01:10:54 peter Exp $ |
| 17030342 MD |
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 | ||
| 48 | ENTRY(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 | */ | |
| 75 | 1: | |
| 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 | */ | |
| 94 | 2: | |
| 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 | |
| eb9f4715 | 103 | END(rfork_thread) |