75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
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/* Install given floating-point environment.
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Copyright (C) 1997-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <fenv.h>
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int
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__fesetenv (const fenv_t *envp)
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{
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fenv_t temp;
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/* Install the environment specified by ENVP. But there are a few
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values which we do not want to come from the saved environment.
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Therefore, we get the current environment and replace the values
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we want to use from the environment specified by the parameter. */
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#ifdef __mcoldfire__
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__asm__ ("fmove%.l %/fpcr,%0" : "=dm" (temp.__control_register));
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__asm__ ("fmove%.l %/fpsr,%0" : "=dm" (temp.__status_register));
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__asm__ ("fmove%.l %/fpiar,%0" : "=dm" (temp.__instruction_address));
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#else
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__asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*&temp));
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#endif
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temp.__status_register &= ~FE_ALL_EXCEPT;
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temp.__control_register &= ~((FE_ALL_EXCEPT << 6) | FE_UPWARD);
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if (envp == FE_DFL_ENV)
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;
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else if (envp == FE_NOMASK_ENV)
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temp.__control_register |= FE_ALL_EXCEPT << 6;
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else
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{
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temp.__control_register |= (envp->__control_register
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& ((FE_ALL_EXCEPT << 6) | FE_UPWARD));
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temp.__status_register |= envp->__status_register & FE_ALL_EXCEPT;
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}
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#ifdef __mcoldfire__
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__asm__ __volatile__ ("fmove%.l %0,%/fpiar"
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:: "dm" (temp.__instruction_address));
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__asm__ __volatile__ ("fmove%.l %0,%/fpcr"
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:: "dm" (temp.__control_register));
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__asm__ __volatile__ ("fmove%.l %0,%/fpsr"
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:: "dm" (temp.__status_register));
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#else
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__asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr/%/fpiar" : : "m" (*&temp));
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#endif
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/* Success. */
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return 0;
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}
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
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strong_alias (__fesetenv, __old_fesetenv)
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compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1);
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#endif
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libm_hidden_def (__fesetenv)
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libm_hidden_ver (__fesetenv, fesetenv)
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versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);
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