]>
Commit | Line | Data |
---|---|---|
46abb64d | 1 | /* _Unwind_Resume wrapper for ARM EABI. |
688903eb | 2 | Copyright (C) 2015-2018 Free Software Foundation, Inc. |
46abb64d RM |
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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <sysdep.h> | |
20 | ||
21 | /* This is just implementing exactly what the C version does. | |
22 | We do it in assembly just to ensure that we get an unmolested tail | |
23 | call to the libgcc function, which is necessary for the ARM unwinder. */ | |
24 | ||
25 | ENTRY (_Unwind_Resume) | |
26 | LDR_HIDDEN (ip, ip, __libgcc_s_resume, 0) | |
27 | cmp ip, #0 | |
28 | beq 1f | |
29 | 0: PTR_DEMANGLE (ip, ip, r2, r3) | |
30 | bx ip | |
31 | ||
32 | /* We need to save and restore LR (for our own return address) | |
33 | and R0 (for the argument to _Unwind_Resume) around the call. */ | |
34 | 1: push {r0, lr} | |
35 | cfi_adjust_cfa_offset (8) | |
36 | cfi_rel_offset (r0, 0) | |
37 | cfi_rel_offset (lr, 4) | |
38 | bl __libgcc_s_init | |
39 | pop {r0, lr} | |
40 | cfi_adjust_cfa_offset (-8) | |
41 | cfi_restore (r0) | |
42 | cfi_restore (lr) | |
43 | ||
44 | LDR_HIDDEN (ip, ip, __libgcc_s_resume, 0) | |
45 | b 0b | |
46 | END (_Unwind_Resume) |