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1 | /* Copyright (C) 2012 Free Software Foundation, Inc. |
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 | |
15 | License along with the GNU C Library; if not, see | |
16 | <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <sysdep.h> | |
19 | ||
20 | #include "ucontext_i.h" | |
21 | ||
22 | .syntax unified | |
23 | .text | |
24 | ||
25 | /* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */ | |
26 | ||
27 | ENTRY(swapcontext) | |
28 | ||
29 | /* Have getcontext() do most of the work then fix up | |
30 | LR afterwards. Save R3 to keep the stack aligned. */ | |
31 | push {r0,r1,r3,r14} | |
32 | cfi_adjust_cfa_offset (16) | |
33 | cfi_rel_offset (r0,0) | |
34 | cfi_rel_offset (r1,4) | |
35 | cfi_rel_offset (r3,8) | |
36 | cfi_rel_offset (r14,12) | |
37 | ||
38 | bl __getcontext | |
39 | mov r4, r0 | |
40 | ||
41 | pop {r0,r1,r3,r14} | |
42 | cfi_adjust_cfa_offset (-16) | |
43 | cfi_restore (r0) | |
44 | cfi_restore (r1) | |
45 | cfi_restore (r3) | |
46 | cfi_restore (r14) | |
47 | ||
48 | /* Exit if getcontext() failed. */ | |
49 | cmp r4, #0 | |
50 | itt ne | |
51 | movne r0, r4 | |
52 | RETINSTR(ne, r14) | |
53 | ||
54 | /* Fix up LR and the PC. */ | |
55 | str r13,[r0, #MCONTEXT_ARM_SP] | |
56 | str r14,[r0, #MCONTEXT_ARM_LR] | |
57 | str r14,[r0, #MCONTEXT_ARM_PC] | |
58 | ||
59 | /* And swap using swapcontext(). */ | |
60 | mov r0, r1 | |
61 | b __setcontext | |
62 | ||
63 | END(swapcontext) |