diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/aarch64/syscall.S')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/aarch64/syscall.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/aarch64/syscall.S b/REORG.TODO/sysdeps/unix/sysv/linux/aarch64/syscall.S new file mode 100644 index 0000000000..d377db45ff --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/aarch64/syscall.S @@ -0,0 +1,44 @@ +/* Copyright (C) 2005-2017 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, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + +/* syscall (int nr, ...) + + AArch64 system calls take between 0 and 7 arguments. On entry here nr + is in w0 and any other system call arguments are in register x1..x7. + + For kernel entry we need to move the system call nr to x8 then + load the remaining arguments to register. */ + +ENTRY (syscall) + uxtw x8, w0 + mov x0, x1 + mov x1, x2 + mov x2, x3 + mov x3, x4 + mov x4, x5 + mov x5, x6 + mov x6, x7 + svc 0x0 + cmn x0, #4095 + b.cs 1f + RET +1: + b SYSCALL_ERROR +PSEUDO_END (syscall) |