projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 04277e02 | 1 | /* Copyright (C) 2001-2019 Free Software Foundation, Inc. |
| 816fc1ed 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 | |
| 41bdb6e2 AJ |
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. | |
| 816fc1ed UD |
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 | |
| 41bdb6e2 | 13 | Lesser General Public License for more details. |
| 816fc1ed | 14 | |
| 41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 | 16 | License along with the GNU C Library; if not, see |
| 5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
| 816fc1ed UD |
18 | |
| 19 | #include <sysdep.h> | |
| 20 | #include <features.h> | |
| 21 | ||
| 22 | #include "ucontext_i.h" | |
| 23 | ||
| 2f438e20 SL |
24 | #include <shlib-compat.h> |
| 25 | ||
| 816fc1ed UD |
26 | /* __getcontext (const ucontext_t *ucp) |
| 27 | ||
| 28 | Saves the machine context in UCP such that when it is activated, | |
| 58f46c79 | 29 | it appears as if __getcontext() returned again. |
| 816fc1ed UD |
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(__getcontext) | |
| c3e94a95 | 36 | lgr %r1,%r2 |
| 816fc1ed | 37 | |
| 05d138ef | 38 | /* rt_sigprocmask (SIG_BLOCK, NULL, &sc->sc_mask, sigsetsize). */ |
| 816fc1ed | 39 | la %r2,SIG_BLOCK |
| cec75f99 | 40 | slgr %r3,%r3 |
| c3e94a95 AK |
41 | la %r4,SC_MASK(%r1) |
| 42 | lghi %r5,_NSIG8 | |
| 816fc1ed UD |
43 | svc SYS_ify(rt_sigprocmask) |
| 44 | ||
| 45 | /* Store fpu context. */ | |
| c3e94a95 AK |
46 | stfpc SC_FPC(%r1) |
| 47 | std %f0,SC_FPRS(%r1) | |
| 48 | std %f1,SC_FPRS+8(%r1) | |
| 49 | std %f2,SC_FPRS+16(%r1) | |
| 50 | std %f3,SC_FPRS+24(%r1) | |
| 51 | std %f4,SC_FPRS+32(%r1) | |
| 52 | std %f5,SC_FPRS+40(%r1) | |
| 53 | std %f6,SC_FPRS+48(%r1) | |
| 54 | std %f7,SC_FPRS+56(%r1) | |
| 55 | std %f8,SC_FPRS+64(%r1) | |
| 56 | std %f9,SC_FPRS+72(%r1) | |
| 57 | std %f10,SC_FPRS+80(%r1) | |
| 58 | std %f11,SC_FPRS+88(%r1) | |
| 59 | std %f12,SC_FPRS+96(%r1) | |
| 60 | std %f13,SC_FPRS+104(%r1) | |
| 61 | std %f14,SC_FPRS+112(%r1) | |
| 62 | std %f15,SC_FPRS+120(%r1) | |
| 816fc1ed | 63 | |
| 58f46c79 | 64 | /* Set __getcontext return value to 0. */ |
| cec75f99 | 65 | slgr %r2,%r2 |
| 58f46c79 | 66 | |
| 8e294940 | 67 | /* Store access registers. */ |
| c3e94a95 | 68 | stam %a0,%a15,SC_ACRS(%r1) |
| 8e294940 | 69 | |
| 816fc1ed | 70 | /* Store general purpose registers. */ |
| c3e94a95 | 71 | stmg %r0,%r15,SC_GPRS(%r1) |
| 816fc1ed | 72 | |
| 58f46c79 | 73 | /* Return. */ |
| 816fc1ed UD |
74 | br %r14 |
| 75 | END(__getcontext) | |
| 76 | ||
| 2f438e20 SL |
77 | #if defined SHARED && SHLIB_COMPAT (libc, GLIBC_2_19, GLIBC_2_20) |
| 78 | /* In glibc release 2.19 a new version of getcontext was introduced, | |
| 79 | but was reverted before 2.20. Thus both versions are the same function. */ | |
| 80 | weak_alias (__getcontext, __v1__getcontext) | |
| 81 | weak_alias (__getcontext, __v2__getcontext) | |
| 82 | versioned_symbol (libc, __v1__getcontext, getcontext, GLIBC_2_1) | |
| 83 | compat_symbol (libc, __v2__getcontext, getcontext, GLIBC_2_19) | |
| 37d13b17 SL |
84 | |
| 85 | #else | |
| 86 | ||
| 87 | weak_alias (__getcontext, getcontext) | |
| 88 | ||
| 89 | #endif /* !(defined SHARED && SHLIB_COMPAT (libc, GLIBC_2_19, GLIBC_2_20)) */ |