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d05e6dc8 | 1 | /* Swap to new context. |
6d7e8eda | 2 | Copyright (C) 2008-2023 Free Software Foundation, Inc. |
d05e6dc8 JDA |
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 | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the 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 | #include "ucontext_i.h" | |
21 | ||
22 | .text | |
23 | ENTRY(__swapcontext) | |
24 | ||
25 | /* Copy rp to ret0 (r28). */ | |
26 | copy %rp,%ret0 | |
27 | ||
28 | /* Create a frame. */ | |
29 | ldo 64(%sp),%sp | |
30 | .cfi_def_cfa_offset -64 | |
31 | ||
32 | /* Save the current machine context to oucp. */ | |
33 | bl __getcontext,%rp | |
34 | ||
35 | /* Copy oucp to register ret1 (r29). __getcontext saves and | |
36 | restores it on a normal return. It is restored from oR29 | |
37 | on reactivation. */ | |
38 | copy %r26,%ret1 | |
39 | ||
40 | /* Pop frame. */ | |
41 | ldo -64(%sp),%sp | |
42 | .cfi_def_cfa_offset 0 | |
43 | ||
44 | /* Load return pointer from oR28. */ | |
45 | ldw oR28(%ret1),%rp | |
46 | ||
47 | /* Return if error. */ | |
48 | or,= %r0,%ret0,%r0 | |
49 | bv,n %r0(%rp) | |
50 | ||
51 | /* Load sc_sar flag. */ | |
52 | ldb oSAR(%ret1),%r20 | |
53 | ||
54 | /* Return if oucp context has been reactivated. */ | |
55 | or,= %r0,%r20,%r0 | |
56 | bv,n %r0(%rp) | |
57 | ||
58 | /* Mark sc_sar flag. */ | |
59 | ldi 1,%r20 | |
60 | stb %r20,oSAR(%ret1) | |
61 | ||
62 | /* Activate the machine context in ucp. */ | |
63 | bl __setcontext,%rp | |
64 | ldw oR25(%ret1),%r26 | |
65 | ||
66 | /* Load return pointer. */ | |
67 | ldw oR28(%ret1),%rp | |
68 | bv,n %r0(%rp) | |
69 | ||
7a5c4401 | 70 | END(__swapcontext) |
d05e6dc8 JDA |
71 | |
72 | weak_alias (__swapcontext, swapcontext) |