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d614a753 | 1 | /* Copyright (C) 2010-2020 Free Software Foundation, Inc. |
2dcd7ed8 DJ |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
ab84e3ff | 15 | License along with the GNU C Library. If not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
2dcd7ed8 | 17 | |
a6f3079b JM |
18 | /* When this file is built for inclusion in nscd, _FORTIFY_SOURCE is |
19 | defined but -O is not used, resulting in a warning from features.h. */ | |
20 | #undef _FORTIFY_SOURCE | |
2dcd7ed8 DJ |
21 | #include <sysdep.h> |
22 | ||
23 | /* Out-of-line syscall stub. We expect the system call number in ip | |
24 | and return the raw result in r0. No registers are clobbered. | |
25 | We could avoid using the stack for this, but the goal is accurate | |
26 | unwind information - and while there is a reserved prefix in the | |
27 | ARM unwind tables for register to register moves, the actual opcodes | |
28 | are not defined. */ | |
29 | ||
3fdf1316 | 30 | #if defined(__thumb__) |
2dcd7ed8 DJ |
31 | .thumb |
32 | .syntax unified | |
33 | .hidden __libc_do_syscall | |
34 | ||
a875971e MM |
35 | #undef CALL_MCOUNT |
36 | #define CALL_MCOUNT | |
37 | ||
2dcd7ed8 DJ |
38 | ENTRY (__libc_do_syscall) |
39 | .fnstart | |
40 | push {r7, lr} | |
41 | .save {r7, lr} | |
42 | cfi_adjust_cfa_offset (8) | |
43 | cfi_rel_offset (r7, 0) | |
44 | cfi_rel_offset (lr, 4) | |
45 | mov r7, ip | |
46 | swi 0x0 | |
47 | pop {r7, pc} | |
48 | .fnend | |
49 | END (__libc_do_syscall) | |
3fdf1316 KR |
50 | |
51 | #endif /* __thumb__ */ |