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feat(userspace/libc): implementation <fenv.h> header
FIXME: testing required! Signed-off-by: EnderIce2 <enderice2@protonmail.com>
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Userspace/libc/include/fenv.h
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51
Userspace/libc/include/fenv.h
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/*
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This file is part of Fennix C Library.
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Fennix C Library is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix C Library. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef _FENV_H
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#define _FENV_H
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typedef int fenv_t;
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typedef int fexcept_t;
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#define FE_DIVBYZERO 0x04
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#define FE_INEXACT 0x20
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#define FE_INVALID 0x01
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#define FE_OVERFLOW 0x08
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#define FE_UNDERFLOW 0x10
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#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
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#define FE_DOWNWARD 0x400
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#define FE_TONEAREST 0x000
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#define FE_TOWARDZERO 0xC00
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#define FE_UPWARD 0x800
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#define FE_DFL_ENV ((const fenv_t *)-1)
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int feclearexcept(int excepts);
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int fegetenv(fenv_t *envp);
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int fegetexceptflag(fexcept_t *flagp, int excepts);
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int fegetround(void);
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int feholdexcept(fenv_t *envp);
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int feraiseexcept(int excepts);
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int fesetenv(const fenv_t *envp);
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int fesetexceptflag(const fexcept_t *flagp, int excepts);
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int fesetround(int round);
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int fetestexcept(int excepts);
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int feupdateenv(const fenv_t *envp);
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#endif // _FENV_H
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201
Userspace/libc/src/std/fenv.c
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201
Userspace/libc/src/std/fenv.c
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/*
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This file is part of Fennix C Library.
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Fennix C Library is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix C Library. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <sys/types.h>
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#include <fenv.h>
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export int feclearexcept(int excepts)
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{
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#if defined(__amd64__) || defined(__i386__)
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unsigned int status;
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__asm__ __volatile__("fnstsw %0" : "=m"(*&status));
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status &= ~excepts;
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__asm__ __volatile__("fldcw %0" : : "m"(*&status));
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return 0;
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#elif defined(__arm__)
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return 0;
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#elif defined(__aarch64__)
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return 0;
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#else
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#error "Unsupported architecture"
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#endif
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}
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export int fegetenv(fenv_t *envp)
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{
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#if defined(__amd64__) || defined(__i386__)
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__asm__ __volatile__("fnstenv %0" : "=m"(*envp));
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return 0;
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#elif defined(__arm__)
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return 0;
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#elif defined(__aarch64__)
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return 0;
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#else
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#error "Unsupported architecture"
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#endif
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}
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export int fegetexceptflag(fexcept_t *flagp, int excepts)
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{
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#if defined(__amd64__) || defined(__i386__)
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unsigned int status;
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__asm__ __volatile__("fnstsw %0" : "=m"(*&status));
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*flagp = status & excepts;
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return 0;
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#elif defined(__arm__)
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return 0;
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#elif defined(__aarch64__)
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return 0;
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#else
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#error "Unsupported architecture"
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#endif
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}
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export int fegetround(void)
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{
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#if defined(__amd64__) || defined(__i386__)
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unsigned int cw;
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__asm__ __volatile__("fnstcw %0" : "=m"(*&cw));
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return cw & 0x0C00;
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#elif defined(__arm__)
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return FE_TONEAREST;
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#elif defined(__aarch64__)
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return FE_TONEAREST;
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#else
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#error "Unsupported architecture"
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#endif
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}
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export int feholdexcept(fenv_t *envp)
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{
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#if defined(__amd64__) || defined(__i386__)
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__asm__ __volatile__("fnstenv %0" : "=m"(*envp));
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unsigned int cw;
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__asm__ __volatile__("fnclex");
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__asm__ __volatile__("fnstcw %0" : "=m"(*&cw));
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cw |= 0x3F; /* Set non-stop mode for all exceptions */
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__asm__ __volatile__("fldcw %0" : : "m"(*&cw));
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return 0;
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#elif defined(__arm__)
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return 0;
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#elif defined(__aarch64__)
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return 0;
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#else
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#error "Unsupported architecture"
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#endif
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}
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export int feraiseexcept(int excepts)
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{
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#if defined(__amd64__) || defined(__i386__)
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unsigned int status;
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__asm__ __volatile__("fnstsw %0" : "=m"(*&status));
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status |= excepts;
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__asm__ __volatile__("fldcw %0" : : "m"(*&status));
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return 0;
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#elif defined(__arm__)
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return 0;
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#elif defined(__aarch64__)
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return 0;
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#else
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#error "Unsupported architecture"
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#endif
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}
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export int fesetenv(const fenv_t *envp)
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{
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#if defined(__amd64__) || defined(__i386__)
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__asm__ __volatile__("fldenv %0" : : "m"(*envp));
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return 0;
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#elif defined(__arm__)
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return 0;
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#elif defined(__aarch64__)
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return 0;
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#else
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#error "Unsupported architecture"
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#endif
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}
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export int fesetexceptflag(const fexcept_t *flagp, int excepts)
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{
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#if defined(__amd64__) || defined(__i386__)
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unsigned int status;
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__asm__ __volatile__("fnstsw %0" : "=m"(*&status));
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status &= ~excepts;
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status |= *flagp & excepts;
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__asm__ __volatile__("fldcw %0" : : "m"(*&status));
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return 0;
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#elif defined(__arm__)
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return 0;
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#elif defined(__aarch64__)
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return 0;
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#else
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#error "Unsupported architecture"
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#endif
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}
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export int fesetround(int round)
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{
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#if defined(__amd64__) || defined(__i386__)
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unsigned int cw;
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if (round != FE_TONEAREST && round != FE_DOWNWARD && round != FE_UPWARD && round != FE_TOWARDZERO)
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return -1;
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__asm__ __volatile__("fnstcw %0" : "=m"(*&cw));
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cw &= ~0x0C00;
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cw |= round;
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__asm__ __volatile__("fldcw %0" : : "m"(*&cw));
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return 0;
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#elif defined(__arm__)
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return 0;
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#elif defined(__aarch64__)
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return 0;
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#else
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#error "Unsupported architecture"
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#endif
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}
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export int fetestexcept(int excepts)
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{
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#if defined(__amd64__) || defined(__i386__)
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unsigned int status;
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__asm__ __volatile__("fnstsw %0" : "=m"(*&status));
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return status & excepts;
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#elif defined(__arm__)
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return 0;
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#elif defined(__aarch64__)
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return 0;
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#else
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#error "Unsupported architecture"
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#endif
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}
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export int feupdateenv(const fenv_t *envp)
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{
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#if defined(__amd64__) || defined(__i386__)
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unsigned int status;
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__asm__ __volatile__("fnstsw %0" : "=m"(*&status));
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__asm__ __volatile__("fldenv %0" : : "m"(*envp));
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__asm__ __volatile__("fldcw %0" : : "m"(*&status));
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return 0;
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#elif defined(__arm__)
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return 0;
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#elif defined(__aarch64__)
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return 0;
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#else
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#error "Unsupported architecture"
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#endif
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}
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