/* Install given floating-point environment. Copyright (C) 1997,98,99,2000,01,02 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <fenv.h> #include <assert.h> libm_hidden_proto(fesetenv) int fesetenv (const fenv_t *envp) { fenv_t temp; /* The memory block used by fstenv/fldenv has a size of 28 bytes. */ assert (sizeof (fenv_t) == 28); /* Install the environment specified by ENVP. But there are a few values which we do not want to come from the saved environment. Therefore, we get the current environment and replace the values we want to use from the environment specified by the parameter. */ __asm__ ("fnstenv %0" : "=m" (*&temp)); if (envp == FE_DFL_ENV) { temp.__control_word |= FE_ALL_EXCEPT; temp.__control_word &= ~FE_TOWARDZERO; temp.__status_word &= ~FE_ALL_EXCEPT; temp.__eip = 0; temp.__cs_selector = 0; temp.__opcode = 0; temp.__data_offset = 0; temp.__data_selector = 0; } else if (envp == FE_NOMASK_ENV) { temp.__control_word &= ~(FE_ALL_EXCEPT | FE_TOWARDZERO); temp.__status_word &= ~FE_ALL_EXCEPT; temp.__eip = 0; temp.__cs_selector = 0; temp.__opcode = 0; temp.__data_offset = 0; temp.__data_selector = 0; } else { temp.__control_word &= ~(FE_ALL_EXCEPT | FE_TOWARDZERO); temp.__control_word |= (envp->__control_word & (FE_ALL_EXCEPT | FE_TOWARDZERO)); temp.__status_word &= ~FE_ALL_EXCEPT; temp.__status_word |= envp->__status_word & FE_ALL_EXCEPT; temp.__eip = envp->__eip; temp.__cs_selector = envp->__cs_selector; temp.__opcode = envp->__opcode; temp.__data_offset = envp->__data_offset; temp.__data_selector = envp->__data_selector; } __asm__ ("fldenv %0" : : "m" (temp)); /* Success. */ return 0; } libm_hidden_def(fesetenv)