projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| b168057a | 1 | /* Copyright (C) 2002-2015 Free Software Foundation, Inc. |
| 956f8acd UD |
2 | This file is part of the GNU C Library. |
| 3 | Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). | |
| 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 | |
| 59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 956f8acd UD |
18 | |
| 19 | #include <sysdep.h> | |
| 20 | #include <features.h> | |
| 21 | ||
| 22 | #include "ucontext_i.h" | |
| 23 | ||
| 24 | /* __swapcontext (ucontext_t *oucp, const ucontext_t *ucp) | |
| 25 | ||
| 26 | Saves the machine context in oucp such that when it is activated, | |
| 27 | it appears as if __swapcontextt() returned again, restores the | |
| 28 | machine context in ucp and thereby resumes execution in that | |
| 29 | context. | |
| 30 | ||
| 31 | This implementation is intended to be used for *synchronous* context | |
| 32 | switches only. Therefore, it does not have to save anything | |
| 33 | other than the PRESERVED state. */ | |
| 34 | ||
| 35 | ENTRY(__swapcontext) | |
| 05d138ef AK |
36 | /* While not part of the ABI a system call never clobbers r0 |
| 37 | or r1. So keeping the values here while calling | |
| 38 | rt_sigprocmask is ok. */ | |
| 956f8acd | 39 | lr %r1,%r2 |
| c3e94a95 | 40 | lr %r0,%r3 |
| 956f8acd UD |
41 | |
| 42 | /* sigprocmask (SIG_BLOCK, NULL, &sc->sc_mask). */ | |
| 43 | la %r2,SIG_BLOCK | |
| 44 | slr %r3,%r3 | |
| 45 | la %r4,SC_MASK(%r1) | |
| c3e94a95 | 46 | lhi %r5,_NSIG8 |
| 956f8acd UD |
47 | svc SYS_ify(rt_sigprocmask) |
| 48 | ||
| 49 | /* Store fpu context. */ | |
| 50 | stfpc SC_FPC(%r1) | |
| 51 | std %f0,SC_FPRS(%r1) | |
| 52 | std %f1,SC_FPRS+8(%r1) | |
| 53 | std %f2,SC_FPRS+16(%r1) | |
| 54 | std %f3,SC_FPRS+24(%r1) | |
| 55 | std %f4,SC_FPRS+32(%r1) | |
| 56 | std %f5,SC_FPRS+40(%r1) | |
| 57 | std %f6,SC_FPRS+48(%r1) | |
| 58 | std %f7,SC_FPRS+56(%r1) | |
| 59 | std %f8,SC_FPRS+64(%r1) | |
| 60 | std %f9,SC_FPRS+72(%r1) | |
| 61 | std %f10,SC_FPRS+80(%r1) | |
| 62 | std %f11,SC_FPRS+88(%r1) | |
| 63 | std %f12,SC_FPRS+96(%r1) | |
| 64 | std %f13,SC_FPRS+104(%r1) | |
| 65 | std %f14,SC_FPRS+112(%r1) | |
| 66 | std %f15,SC_FPRS+120(%r1) | |
| 67 | ||
| 05d138ef AK |
68 | /* Set __swapcontext return value to 0. */ |
| 69 | slr %r2,%r2 | |
| 70 | ||
| 2f438e20 SL |
71 | /* Store access registers. */ |
| 72 | stam %a0,%a15,SC_ACRS(%r1) | |
| 73 | ||
| 956f8acd UD |
74 | /* Store general purpose registers. */ |
| 75 | stm %r0,%r15,SC_GPRS(%r1) | |
| 9c84384c | 76 | |
| 2f438e20 SL |
77 | /* sigprocmask (SIG_SETMASK, &sc->sc_mask, NULL). */ |
| 78 | la %r2,SIG_BLOCK | |
| c3e94a95 | 79 | lr %r5,%r0 |
| 2f438e20 | 80 | la %r3,SC_MASK(%r5) |
| 956f8acd | 81 | slr %r4,%r4 |
| c3e94a95 | 82 | lhi %r5,_NSIG8 |
| 956f8acd UD |
83 | svc SYS_ify(rt_sigprocmask) |
| 84 | ||
| 85 | /* Load fpu context. */ | |
| c3e94a95 | 86 | lr %r5,%r0 |
| 956f8acd UD |
87 | lfpc SC_FPC(%r5) |
| 88 | ld %f0,SC_FPRS(%r5) | |
| 89 | ld %f1,SC_FPRS+8(%r5) | |
| 90 | ld %f2,SC_FPRS+16(%r5) | |
| 91 | ld %f3,SC_FPRS+24(%r5) | |
| 92 | ld %f4,SC_FPRS+32(%r5) | |
| 93 | ld %f5,SC_FPRS+40(%r5) | |
| 94 | ld %f6,SC_FPRS+48(%r5) | |
| 95 | ld %f7,SC_FPRS+56(%r5) | |
| 96 | ld %f8,SC_FPRS+64(%r5) | |
| 97 | ld %f9,SC_FPRS+72(%r5) | |
| 98 | ld %f10,SC_FPRS+80(%r5) | |
| 99 | ld %f11,SC_FPRS+88(%r5) | |
| 100 | ld %f12,SC_FPRS+96(%r5) | |
| 101 | ld %f13,SC_FPRS+104(%r5) | |
| 102 | ld %f14,SC_FPRS+112(%r5) | |
| 103 | ld %f15,SC_FPRS+120(%r5) | |
| 9c84384c | 104 | |
| 956f8acd UD |
105 | /* Don't touch %a0, used for thread purposes. */ |
| 106 | lam %a1,%a15,SC_ACRS+4(%r5) | |
| 107 | ||
| 108 | /* Load general purpose registers. */ | |
| 109 | lm %r0,%r15,SC_GPRS(%r5) | |
| 110 | ||
| 111 | /* Return. */ | |
| 112 | br %r14 | |
| 9c84384c | 113 | END(__swapcontext) |
| 1ab18a5b | 114 | weak_alias (__swapcontext, swapcontext) |