0a6a1f1d05
This brings our tree to NetBSD 7.0, as found on -current on the 10-10-2015. This updates: - LLVM to 3.6.1 - GCC to GCC 5.1 - Replace minix/commands/zdump with usr.bin/zdump - external/bsd/libelf has moved to /external/bsd/elftoolchain/ - Import ctwm - Drop sprintf from libminc Change-Id: I149836ac18e9326be9353958bab9b266efb056f0
280 lines
7.0 KiB
C
280 lines
7.0 KiB
C
/* $NetBSD: fenv.c,v 1.1 2014/09/19 17:36:25 matt Exp $ */
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/*-
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* Copyright (c) 2014 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: fenv.c,v 1.1 2014/09/19 17:36:25 matt Exp $");
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <assert.h>
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#include <fenv.h>
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#include <stddef.h>
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#include <string.h>
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#include <riscv/sysreg.h>
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/*
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* The following constant represents the default floating-point environment
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* (that is, the one installed at program startup) and has type pointer to
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* const-qualified fenv_t.
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*
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* It can be used as an argument to the functions within the <fenv.h> header
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* that manage the floating-point environment, namely fesetenv() and
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* feupdateenv().
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*/
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fenv_t __fe_dfl_env = __SHIFTIN(FCSR_FRM_RNE, FCSR_FRM);
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/*
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* The feclearexcept() function clears the supported floating-point exceptions
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* represented by `excepts'.
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*/
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int
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feclearexcept(int excepts)
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{
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_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
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int fflags = riscvreg_fcsr_read_fflags();
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fflags &= ~(excepts & FE_ALL_EXCEPT);
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riscvreg_fcsr_write_fflags(fflags);
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/* Success */
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return (0);
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}
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/*
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* The fegetexceptflag() function stores an implementation-defined
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* representation of the states of the floating-point status flags indicated by
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* the argument excepts in the object pointed to by the argument flagp.
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*/
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int
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fegetexceptflag(fexcept_t *flagp, int excepts)
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{
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_DIAGASSERT(flagp != NULL);
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_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
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*flagp = riscvreg_fcsr_read_fflags() & excepts;
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/* Success */
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return (0);
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}
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/*
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* The feraiseexcept() function raises the supported floating-point exceptions
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* represented by the argument `excepts'.
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*
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* The standard explicitly allows us to execute an instruction that has the
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* exception as a side effect, but we choose to manipulate the status register
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* directly.
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*
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* The validation of input is being deferred to fesetexceptflag().
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*/
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int
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feraiseexcept(int excepts)
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{
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fexcept_t ex = 0;
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_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
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excepts &= FE_ALL_EXCEPT;
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fesetexceptflag(&ex, excepts);
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/* XXX exception magic XXX */
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/* Success */
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return (0);
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}
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/*
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* This function sets the floating-point status flags indicated by the argument
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* `excepts' to the states stored in the object pointed to by `flagp'. It does
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* NOT raise any floating-point exceptions, but only sets the state of the flags.
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*/
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int
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fesetexceptflag(const fexcept_t *flagp, int excepts)
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{
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_DIAGASSERT(flagp != NULL);
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_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
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excepts &= FE_ALL_EXCEPT;
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int fflags = riscvreg_fcsr_read_fflags();
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fflags = (fflags & ~excepts) | (*flagp & excepts);
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riscvreg_fcsr_write_fflags(fflags);
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/* Success */
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return (0);
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}
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/*
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* The fetestexcept() function determines which of a specified subset of the
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* floating-point exception flags are currently set. The `excepts' argument
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* specifies the floating-point status flags to be queried.
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*/
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int
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fetestexcept(int excepts)
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{
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_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
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return riscvreg_fcsr_read_fflags() & excepts & FE_ALL_EXCEPT;
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}
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int
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fegetround(void)
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{
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return riscvreg_fcsr_read_frm();
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}
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/*
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* The fesetround() function shall establish the rounding direction represented
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* by its argument round. If the argument is not equal to the value of a
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* rounding direction macro, the rounding direction is not changed.
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*/
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int
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fesetround(int round)
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{
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if ((unsigned int)round > FCSR_FRM_RMM) {
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/* Failure */
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return (-1);
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}
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riscvreg_fcsr_write_frm(round);
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/* Success */
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return (0);
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}
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/*
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* The fegetenv() function attempts to store the current floating-point
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* environment in the object pointed to by envp.
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*/
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int
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fegetenv(fenv_t *envp)
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{
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_DIAGASSERT(envp != NULL);
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*envp = riscvreg_fcsr_read();
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/* Success */
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return (0);
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}
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/*
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* The feholdexcept() function saves the current floating-point environment in
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* the object pointed to by envp, clears the floating-point status flags, and
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* then installs a non-stop (continue on floating-point exceptions) mode, if
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* available, for all floating-point exceptions.
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*/
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int
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feholdexcept(fenv_t *envp)
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{
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_DIAGASSERT(envp != NULL);
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*envp = riscvreg_fcsr_read();
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riscvreg_fcsr_write_fflags(0);
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/* Success */
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return (0);
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}
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/*
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* The fesetenv() function attempts to establish the floating-point environment
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* represented by the object pointed to by envp. The argument `envp' points
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* to an object set by a call to fegetenv() or feholdexcept(), or equal a
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* floating-point environment macro. The fesetenv() function does not raise
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* floating-point exceptions, but only installs the state of the floating-point
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* status flags represented through its argument.
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*/
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int
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fesetenv(const fenv_t *envp)
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{
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_DIAGASSERT(envp != NULL);
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fenv_t env = *envp;
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if ((env & ~(FCSR_FRM|FCSR_FFLAGS)
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|| __SHIFTOUT(env, FCSR_FRM) > FCSR_FRM_RMM)) {
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return -1;
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}
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riscvreg_fcsr_write(env);
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/* Success */
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return (0);
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}
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/*
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* The feupdateenv() function saves the currently raised floating-point
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* exceptions in its automatic storage, installs the floating-point environment
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* represented by the object pointed to by `envp', and then raises the saved
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* floating-point exceptions. The argument `envp' shall point to an object set
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* by a call to feholdexcept() or fegetenv(), or equal a floating-point
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* environment macro.
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*/
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int
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feupdateenv(const fenv_t *envp)
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{
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_DIAGASSERT(envp != NULL);
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int fflags = riscvreg_fcsr_read_fflags();
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fesetenv(envp);
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feraiseexcept(fflags);
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/* Success */
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return (0);
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}
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/*
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* The following functions are extentions to the standard
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*/
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int
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feenableexcept(int nmask)
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{
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return 0;
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}
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int
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fedisableexcept(int nmask)
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{
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return 0;
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}
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int
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fegetexcept(void)
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{
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return 0;
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}
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