1 | /* Copyright (C) 2005-2024 Free Software Foundation, Inc. |
2 | |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public License as |
7 | published by the Free Software Foundation; either version 2.1 of the |
8 | License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <sysdep.h> |
20 | |
21 | /* syscall (int nr, ...) |
22 | |
23 | AArch64 system calls take between 0 and 7 arguments. On entry here nr |
24 | is in w0 and any other system call arguments are in register x1..x7. |
25 | |
26 | For kernel entry we need to move the system call nr to x8 then |
27 | load the remaining arguments to register. */ |
28 | |
29 | ENTRY (syscall) |
30 | uxtw x8, w0 |
31 | mov x0, x1 |
32 | mov x1, x2 |
33 | mov x2, x3 |
34 | mov x3, x4 |
35 | mov x4, x5 |
36 | mov x5, x6 |
37 | mov x6, x7 |
38 | svc 0x0 |
39 | cmn x0, #4095 |
40 | b.cs 1f |
41 | RET |
42 | 1: |
43 | b SYSCALL_ERROR |
44 | PSEUDO_END (syscall) |
45 | |