| 1 | /* Install given floating-point environment. |
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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 | |
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| 21 | int |
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| 22 | __fesetenv (const fenv_t *envp) |
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| 23 | { |
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| 24 | fenv_t temp; |
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| 25 | |
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| 26 | /* Install the environment specified by ENVP. But there are a few |
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| 27 | values which we do not want to come from the saved environment. |
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| 28 | Therefore, we get the current environment and replace the values |
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| 29 | we want to use from the environment specified by the parameter. */ |
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| 30 | #ifdef __mcoldfire__ |
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| 31 | __asm__ ("fmove%.l %/fpcr,%0" : "=dm" (temp.__control_register)); |
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| 32 | __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (temp.__status_register)); |
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| 33 | __asm__ ("fmove%.l %/fpiar,%0" : "=dm" (temp.__instruction_address)); |
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| 34 | #else |
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| 35 | __asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*&temp)); |
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| 36 | #endif |
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| 37 | |
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| 38 | temp.__status_register &= ~FE_ALL_EXCEPT; |
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| 39 | temp.__control_register &= ~((FE_ALL_EXCEPT << 6) | FE_UPWARD); |
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| 40 | if (envp == FE_DFL_ENV) |
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| 41 | ; |
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| 42 | else if (envp == FE_NOMASK_ENV) |
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| 43 | temp.__control_register |= FE_ALL_EXCEPT << 6; |
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| 44 | else |
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| 45 | { |
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| 46 | temp.__control_register |= (envp->__control_register |
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| 47 | & ((FE_ALL_EXCEPT << 6) | FE_UPWARD)); |
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| 48 | temp.__status_register |= envp->__status_register & FE_ALL_EXCEPT; |
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| 49 | } |
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| 50 | |
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| 51 | #ifdef __mcoldfire__ |
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| 52 | __asm__ __volatile__ ("fmove%.l %0,%/fpiar" |
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| 53 | :: "dm" (temp.__instruction_address)); |
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| 54 | __asm__ __volatile__ ("fmove%.l %0,%/fpcr" |
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| 55 | :: "dm" (temp.__control_register)); |
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| 56 | __asm__ __volatile__ ("fmove%.l %0,%/fpsr" |
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| 57 | :: "dm" (temp.__status_register)); |
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| 58 | #else |
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| 59 | __asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr/%/fpiar" : : "m" (*&temp)); |
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| 60 | #endif |
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| 61 | |
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| 62 | /* Success. */ |
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| 63 | return 0; |
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| 64 | } |
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| 65 | |
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| 66 | #include <shlib-compat.h> |
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| 67 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
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| 68 | strong_alias (__fesetenv, __old_fesetenv) |
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| 69 | compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1); |
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| 70 | #endif |
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| 71 | |
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| 72 | libm_hidden_def (__fesetenv) |
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| 73 | libm_hidden_ver (__fesetenv, fesetenv) |
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| 74 | versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2); |
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| 75 | |
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