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581c785b | 1 | /* Copyright (C) 2002-2022 Free Software Foundation, Inc. |
956f8acd | 2 | This file is part of the GNU C Library. |
956f8acd UD |
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 | |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
956f8acd UD |
17 | |
18 | #include <sysdep.h> | |
19 | #include <features.h> | |
20 | ||
21 | #include "ucontext_i.h" | |
22 | ||
23 | /* __swapcontext (ucontext_t *oucp, const ucontext_t *ucp) | |
24 | ||
25 | Saves the machine context in oucp such that when it is activated, | |
2e807f29 | 26 | it appears as if __swapcontext() returned again, restores the |
956f8acd UD |
27 | machine context in ucp and thereby resumes execution in that |
28 | context. | |
29 | ||
30 | This implementation is intended to be used for *synchronous* context | |
31 | switches only. Therefore, it does not have to save anything | |
32 | other than the PRESERVED state. */ | |
33 | ||
34 | ENTRY(__swapcontext) | |
05d138ef AK |
35 | /* While not part of the ABI a system call never clobbers r0 |
36 | or r1. So keeping the values here while calling | |
37 | rt_sigprocmask is ok. */ | |
956f8acd | 38 | lr %r1,%r2 |
c3e94a95 | 39 | lr %r0,%r3 |
956f8acd | 40 | |
956f8acd UD |
41 | /* Store fpu context. */ |
42 | stfpc SC_FPC(%r1) | |
43 | std %f0,SC_FPRS(%r1) | |
44 | std %f1,SC_FPRS+8(%r1) | |
45 | std %f2,SC_FPRS+16(%r1) | |
46 | std %f3,SC_FPRS+24(%r1) | |
47 | std %f4,SC_FPRS+32(%r1) | |
48 | std %f5,SC_FPRS+40(%r1) | |
49 | std %f6,SC_FPRS+48(%r1) | |
50 | std %f7,SC_FPRS+56(%r1) | |
51 | std %f8,SC_FPRS+64(%r1) | |
52 | std %f9,SC_FPRS+72(%r1) | |
53 | std %f10,SC_FPRS+80(%r1) | |
54 | std %f11,SC_FPRS+88(%r1) | |
55 | std %f12,SC_FPRS+96(%r1) | |
56 | std %f13,SC_FPRS+104(%r1) | |
57 | std %f14,SC_FPRS+112(%r1) | |
58 | std %f15,SC_FPRS+120(%r1) | |
59 | ||
05d138ef AK |
60 | /* Set __swapcontext return value to 0. */ |
61 | slr %r2,%r2 | |
62 | ||
2f438e20 SL |
63 | /* Store access registers. */ |
64 | stam %a0,%a15,SC_ACRS(%r1) | |
65 | ||
956f8acd UD |
66 | /* Store general purpose registers. */ |
67 | stm %r0,%r15,SC_GPRS(%r1) | |
9c84384c | 68 | |
2e807f29 SL |
69 | /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, |
70 | sigsetsize). */ | |
71 | la %r2,SIG_SETMASK | |
c3e94a95 | 72 | lr %r5,%r0 |
2f438e20 | 73 | la %r3,SC_MASK(%r5) |
2e807f29 | 74 | la %r4,SC_MASK(%r1) |
c3e94a95 | 75 | lhi %r5,_NSIG8 |
956f8acd UD |
76 | svc SYS_ify(rt_sigprocmask) |
77 | ||
78 | /* Load fpu context. */ | |
c3e94a95 | 79 | lr %r5,%r0 |
956f8acd UD |
80 | lfpc SC_FPC(%r5) |
81 | ld %f0,SC_FPRS(%r5) | |
82 | ld %f1,SC_FPRS+8(%r5) | |
83 | ld %f2,SC_FPRS+16(%r5) | |
84 | ld %f3,SC_FPRS+24(%r5) | |
85 | ld %f4,SC_FPRS+32(%r5) | |
86 | ld %f5,SC_FPRS+40(%r5) | |
87 | ld %f6,SC_FPRS+48(%r5) | |
88 | ld %f7,SC_FPRS+56(%r5) | |
89 | ld %f8,SC_FPRS+64(%r5) | |
90 | ld %f9,SC_FPRS+72(%r5) | |
91 | ld %f10,SC_FPRS+80(%r5) | |
92 | ld %f11,SC_FPRS+88(%r5) | |
93 | ld %f12,SC_FPRS+96(%r5) | |
94 | ld %f13,SC_FPRS+104(%r5) | |
95 | ld %f14,SC_FPRS+112(%r5) | |
96 | ld %f15,SC_FPRS+120(%r5) | |
9c84384c | 97 | |
956f8acd UD |
98 | /* Don't touch %a0, used for thread purposes. */ |
99 | lam %a1,%a15,SC_ACRS+4(%r5) | |
100 | ||
101 | /* Load general purpose registers. */ | |
102 | lm %r0,%r15,SC_GPRS(%r5) | |
103 | ||
104 | /* Return. */ | |
105 | br %r14 | |
9c84384c | 106 | END(__swapcontext) |
1ab18a5b | 107 | weak_alias (__swapcontext, swapcontext) |