projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| dff8da6b | 1 | /* Copyright (C) 2001-2024 Free Software Foundation, Inc. |
| 816fc1ed | 2 | This file is part of the GNU C Library. |
| 816fc1ed UD |
3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
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. | |
| 816fc1ed UD |
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 | |
| 41bdb6e2 | 12 | Lesser General Public License for more details. |
| 816fc1ed | 13 | |
| 41bdb6e2 | 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/>. */ |
| 816fc1ed UD |
17 | |
| 18 | #include <sysdep.h> | |
| 19 | #include <features.h> | |
| 20 | ||
| 21 | #include "ucontext_i.h" | |
| 22 | ||
| 2f438e20 SL |
23 | #include <shlib-compat.h> |
| 24 | ||
| 816fc1ed UD |
25 | /* __getcontext (const ucontext_t *ucp) |
| 26 | ||
| 27 | Saves the machine context in UCP such that when it is activated, | |
| 58f46c79 | 28 | it appears as if __getcontext() returned again. |
| 816fc1ed UD |
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(__getcontext) | |
| e57d8fc9 | 35 | lgr %r0,%r2 |
| 816fc1ed | 36 | |
| 05d138ef | 37 | /* rt_sigprocmask (SIG_BLOCK, NULL, &sc->sc_mask, sigsetsize). */ |
| e57d8fc9 | 38 | la %r4,SC_MASK(%r2) |
| 816fc1ed | 39 | la %r2,SIG_BLOCK |
| cec75f99 | 40 | slgr %r3,%r3 |
| c3e94a95 | 41 | lghi %r5,_NSIG8 |
| e57d8fc9 SL |
42 | lghi %r1,SYS_ify(rt_sigprocmask) |
| 43 | svc 0 | |
| 816fc1ed UD |
44 | |
| 45 | /* Store fpu context. */ | |
| e57d8fc9 | 46 | lgr %r1,%r0 |
| c3e94a95 AK |
47 | stfpc SC_FPC(%r1) |
| 48 | std %f0,SC_FPRS(%r1) | |
| 49 | std %f1,SC_FPRS+8(%r1) | |
| 50 | std %f2,SC_FPRS+16(%r1) | |
| 51 | std %f3,SC_FPRS+24(%r1) | |
| 52 | std %f4,SC_FPRS+32(%r1) | |
| 53 | std %f5,SC_FPRS+40(%r1) | |
| 54 | std %f6,SC_FPRS+48(%r1) | |
| 55 | std %f7,SC_FPRS+56(%r1) | |
| 56 | std %f8,SC_FPRS+64(%r1) | |
| 57 | std %f9,SC_FPRS+72(%r1) | |
| 58 | std %f10,SC_FPRS+80(%r1) | |
| 59 | std %f11,SC_FPRS+88(%r1) | |
| 60 | std %f12,SC_FPRS+96(%r1) | |
| 61 | std %f13,SC_FPRS+104(%r1) | |
| 62 | std %f14,SC_FPRS+112(%r1) | |
| 63 | std %f15,SC_FPRS+120(%r1) | |
| 816fc1ed | 64 | |
| 58f46c79 | 65 | /* Set __getcontext return value to 0. */ |
| cec75f99 | 66 | slgr %r2,%r2 |
| 58f46c79 | 67 | |
| 8e294940 | 68 | /* Store access registers. */ |
| c3e94a95 | 69 | stam %a0,%a15,SC_ACRS(%r1) |
| 8e294940 | 70 | |
| 816fc1ed | 71 | /* Store general purpose registers. */ |
| c3e94a95 | 72 | stmg %r0,%r15,SC_GPRS(%r1) |
| 816fc1ed | 73 | |
| 664f565f SL |
74 | /* Store psw mask to 0x0 and addr to return address. Then the address |
| 75 | can be retrieved from the ucontext structure in the same way as if it | |
| 76 | is created by kernel and passed to a signal-handler. */ | |
| 77 | stg %r2,SC_PSW+0(%r1) | |
| 78 | stg %r14,SC_PSW+8(%r1) | |
| 79 | ||
| 58f46c79 | 80 | /* Return. */ |
| 816fc1ed UD |
81 | br %r14 |
| 82 | END(__getcontext) | |
| 83 | ||
| 2f438e20 SL |
84 | #if defined SHARED && SHLIB_COMPAT (libc, GLIBC_2_19, GLIBC_2_20) |
| 85 | /* In glibc release 2.19 a new version of getcontext was introduced, | |
| 86 | but was reverted before 2.20. Thus both versions are the same function. */ | |
| 87 | weak_alias (__getcontext, __v1__getcontext) | |
| 88 | weak_alias (__getcontext, __v2__getcontext) | |
| 89 | versioned_symbol (libc, __v1__getcontext, getcontext, GLIBC_2_1) | |
| 90 | compat_symbol (libc, __v2__getcontext, getcontext, GLIBC_2_19) | |
| 37d13b17 SL |
91 | |
| 92 | #else | |
| 93 | ||
| 94 | weak_alias (__getcontext, getcontext) | |
| 95 | ||
| 96 | #endif /* !(defined SHARED && SHLIB_COMPAT (libc, GLIBC_2_19, GLIBC_2_20)) */ |