From 119d5dfbe0adfb6f11c830fb2434dd01ac628cf1 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Tue, 15 Feb 2005 01:38:50 +0000 Subject: some more x86_64 source --- libc/sysdeps/linux/x86_64/vfork.S | 53 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 libc/sysdeps/linux/x86_64/vfork.S (limited to 'libc/sysdeps/linux/x86_64/vfork.S') diff --git a/libc/sysdeps/linux/x86_64/vfork.S b/libc/sysdeps/linux/x86_64/vfork.S new file mode 100644 index 000000000..072a3a0a8 --- /dev/null +++ b/libc/sysdeps/linux/x86_64/vfork.S @@ -0,0 +1,53 @@ +/* Copyright (C) 2001, 2002, 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#define _ERRNO_H 1 +#include + +/* Clone the calling process, but without copying the whole address space. + The calling process is suspended until the new process exits or is + replaced by a call to `execve'. Return -1 for errors, 0 to the new process, + and the process ID of the new process to the old process. */ + +.globl __vfork; +.type __vfork,@function; +.align 16; +__vfork: + + /* Pop the return PC value into RDI. We need a register that + is preserved by the syscall and that we're allowed to destroy. */ + popq %rdi + + /* Stuff the syscall number in RAX and enter into the kernel. */ + movl $__NR_vfork, %eax + syscall + + /* Push back the return PC. */ + pushq %rdi + + cmpl $-4095, %eax + jae __syscall_error /* Branch forward if it failed. */ + + /* Normal return. */ + ret + +__syscall_error: + /* TODO: implement this ! :D */ + +.size __vfork,.Lsize-__vfork +.weak vfork ; vfork = __vfork -- cgit v1.2.3