1 | /* _Unwind_Resume wrapper for ARM EABI. |
2 | Copyright (C) 2015-2022 Free Software Foundation, Inc. |
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 | /* This is equivalent to the following C implementation: |
22 | |
23 | void |
24 | _Unwind_Resume (struct _Unwind_Exception *exc) |
25 | { |
26 | __unwind_link_get_resume () (exc); |
27 | } |
28 | |
29 | We do it in assembly just to ensure that we get an unmolested tail |
30 | call to the libgcc function, which is necessary for the ARM unwinder. */ |
31 | |
32 | ENTRY (_Unwind_Resume) |
33 | /* We need to save and restore LR (for our own return address) |
34 | and R0 (for the argument to _Unwind_Resume) around the call. */ |
35 | push {r0, lr} |
36 | cfi_adjust_cfa_offset (8) |
37 | cfi_rel_offset (r0, 0) |
38 | cfi_rel_offset (lr, 4) |
39 | bl __unwind_link_get_resume |
40 | mov r3, r0 |
41 | pop {r0, lr} |
42 | cfi_adjust_cfa_offset (-8) |
43 | cfi_restore (r4) |
44 | cfi_restore (lr) |
45 | bx r3 |
46 | END (_Unwind_Resume) |
47 | |