diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/sysdeps/linux/x86_64/syscall.S | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/x86_64/syscall.S b/libc/sysdeps/linux/x86_64/syscall.S new file mode 100644 index 000000000..8795f9a69 --- /dev/null +++ b/libc/sysdeps/linux/x86_64/syscall.S @@ -0,0 +1,48 @@ +/* Copyright (C) 2001, 2003 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. */ + +#include <sysdep.h> + +/* Please consult the file sysdeps/unix/sysv/linux/x86-64/sysdep.h for + more information about the value -4095 used below. */ + +/* Usage: long syscall (syscall_number, arg1, arg2, arg3, arg4, arg5, arg6) + We need to do some arg shifting, the syscall_number will be in + rax. */ + + +.globl syscall; +.type syscall,@function; +.align 16; +syscall: + movq %rdi, %rax /* Syscall number -> rax. */ + movq %rsi, %rdi /* shift arg1 - arg5. */ + movq %rdx, %rsi + movq %rcx, %rdx + movq %r8, %r10 + movq %r9, %r8 + movq 8(%rsp),%r9 /* arg6 is on the stack. */ + syscall /* Do the system call. */ + cmpq $-4095, %rax /* Check %rax for error. */ + jae __syscall_error /* Branch forward if it failed. */ + ret /* Return to caller. */ + +__syscall_error: + /* TODO: implement this ! :D */ + +.size syscall,.-syscall; |