| 1 | /* Install given floating-point environment and raise exceptions. |
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| 2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <fenv.h> |
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| 20 | #include <unistd.h> |
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| 21 | #include <dl-procinfo.h> |
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| 22 | #include <ldsodefs.h> |
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| 23 | |
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| 24 | int |
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| 25 | __feupdateenv (const fenv_t *envp) |
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| 26 | { |
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| 27 | fexcept_t temp; |
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| 28 | unsigned int xtemp = 0; |
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| 29 | |
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| 30 | /* Save current exceptions. */ |
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| 31 | __asm__ ("fnstsw %0" : "=m" (*&temp)); |
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| 32 | |
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| 33 | /* If the CPU supports SSE we test the MXCSR as well. */ |
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| 34 | if (CPU_FEATURE_USABLE (SSE)) |
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| 35 | __asm__ ("stmxcsr %0" : "=m" (*&xtemp)); |
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| 36 | |
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| 37 | temp = (temp | xtemp) & FE_ALL_EXCEPT; |
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| 38 | |
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| 39 | /* Install new environment. */ |
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| 40 | __fesetenv (envp: envp); |
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| 41 | |
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| 42 | /* Raise the saved exception. Incidentally for us the implementation |
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| 43 | defined format of the values in objects of type fexcept_t is the |
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| 44 | same as the ones specified using the FE_* constants. */ |
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| 45 | __feraiseexcept (excepts: (int) temp); |
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| 46 | |
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| 47 | /* Success. */ |
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| 48 | return 0; |
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| 49 | } |
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| 50 | |
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| 51 | #include <shlib-compat.h> |
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| 52 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
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| 53 | strong_alias (__feupdateenv, __old_feupdateenv) |
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| 54 | compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1); |
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| 55 | #endif |
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| 56 | |
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| 57 | libm_hidden_def (__feupdateenv) |
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| 58 | libm_hidden_ver (__feupdateenv, feupdateenv) |
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| 59 | versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2); |
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| 60 | |
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