From 75e8f644e1a5edfdf8fa70f3544954e48e8c7f58 Mon Sep 17 00:00:00 2001 From: drahn Date: Tue, 27 Apr 2021 00:31:34 +0000 Subject: [PATCH] riscv64 additions for libm ok kettenis@ --- lib/libm/Makefile | 6 +- lib/libm/arch/riscv64/fenv.c | 264 +++++++++++++++++++++++++++++++++++ 2 files changed, 268 insertions(+), 2 deletions(-) create mode 100644 lib/libm/arch/riscv64/fenv.c diff --git a/lib/libm/Makefile b/lib/libm/Makefile index b5c34b38115..47cd94cac06 100644 --- a/lib/libm/Makefile +++ b/lib/libm/Makefile @@ -1,4 +1,4 @@ -# $OpenBSD: Makefile,v 1.121 2020/11/07 11:56:40 kettenis Exp $ +# $OpenBSD: Makefile,v 1.122 2021/04/27 00:31:34 drahn Exp $ # $NetBSD: Makefile,v 1.28 1995/11/20 22:06:19 jtc Exp $ # # @(#)Makefile 5.1beta 93/09/24 @@ -62,6 +62,8 @@ ARCH_SRCS = e_sqrt.c e_sqrtf.c s_fabsf.c .PATH: ${.CURDIR}/arch/powerpc .elif (${MACHINE_ARCH} == "powerpc64") .PATH: ${.CURDIR}/arch/powerpc64 +.elif (${MACHINE_ARCH} == "riscv64") +.PATH: ${.CURDIR}/arch/riscv64 .elif (${MACHINE_ARCH} == "sparc64") .PATH: ${.CURDIR}/arch/sparc64 ARCH_SRCS = e_sqrtl.c @@ -138,7 +140,7 @@ CPPFLAGS+= -I${.CURDIR}/src -I${.CURDIR}/src/ld80 SRCS+= ${LONG_SRCS} .endif .if (${MACHINE_CPU} == "mips64") || (${MACHINE_ARCH} == "sparc64") || \ - (${MACHINE_ARCH} == "aarch64") + (${MACHINE_ARCH} == "aarch64") || (${MACHINE_ARCH} == "riscv64") .PATH: ${.CURDIR}/src/ld128 CPPFLAGS+= -I${.CURDIR}/src -I${.CURDIR}/src/ld128 SRCS+= ${LONG_SRCS} diff --git a/lib/libm/arch/riscv64/fenv.c b/lib/libm/arch/riscv64/fenv.c new file mode 100644 index 00000000000..635cb0eab50 --- /dev/null +++ b/lib/libm/arch/riscv64/fenv.c @@ -0,0 +1,264 @@ +/* $OpenBSD: fenv.c,v 1.1 2021/04/27 00:31:34 drahn Exp $ */ +/*- + * Copyright (c) 2004-2005 David Schultz + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD: head/lib/msun/aarch64/fenv.h 280857 2015-03-30 16:42:08Z emaste $ + */ + +#include +#include + +/* We need to be able to map status flag positions to mask flag positions */ +#define _FPUSW_SHIFT 8 +#define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT) + +#define __get_fcsr(r) asm volatile("frcsr %0" : "=r" (r)) +#define __set_fcsr(r) asm volatile("fscsr %0" : "+r" (r)) +#define __get_flags(r) asm volatile("frflags %0" : "=r" (r)) +#define __set_flags(r) asm volatile("fsflags %0" : "+r" (r)) +#define __get_frm(r) asm volatile("frrm %0" : "=r" (r)) +#define __set_frm(r) asm volatile("fsrm %0" : "+r"(r) ) + +/* + * The following constant represents the default floating-point environment + * (that is, the one installed at program startup) and has type pointer to + * const-qualified fenv_t. + * + * It can be used as an argument to the functions within the header + * that manage the floating-point environment, namely fesetenv() and + * feupdateenv(). + */ +fenv_t __fe_dfl_env = 0; + +/* + * The feclearexcept() function clears the supported floating-point exceptions + * represented by `excepts'. + */ +int +feclearexcept(int excepts) +{ + fexcept_t r; + + excepts &= FE_ALL_EXCEPT; + __get_flags(r); + r &= ~excepts; + __set_flags(r); + return (0); +} +DEF_STD(feclearexcept); + +/* + * The fegetexceptflag() function stores an implementation-defined + * representation of the states of the floating-point status flags indicated by + * the argument excepts in the object pointed to by the argument flagp. + */ +int +fegetexceptflag(fexcept_t *flagp, int excepts) +{ + fexcept_t r; + + excepts &= FE_ALL_EXCEPT; + __get_flags(r); + *flagp = r & excepts; + return (0); +} + +/* + * The feraiseexcept() function raises the supported floating-point exceptions + * represented by the argument `excepts'. + */ +int +feraiseexcept(int excepts) +{ + fexcept_t r; + + excepts &= FE_ALL_EXCEPT; + __get_flags(r); + r |= excepts; + __set_flags(r); + return (0); +} +DEF_STD(feraiseexcept); + +/* + * This function sets the floating-point status flags indicated by the argument + * `excepts' to the states stored in the object pointed to by `flagp'. It does + * NOT raise any floating-point exceptions, but only sets the state of the flags. + */ +int +fesetexceptflag(const fexcept_t *flagp, int excepts) +{ + fexcept_t r; + + excepts &= FE_ALL_EXCEPT; + __get_flags(r); + r &= ~excepts; + r |= *flagp & excepts; + __set_flags(r); + return (0); +} +DEF_STD(fesetexceptflag); + +/* + * The fetestexcept() function determines which of a specified subset of the + * floating-point exception flags are currently set. The `excepts' argument + * specifies the floating-point status flags to be queried. + */ +int +fetestexcept(int excepts) +{ + fexcept_t r; + + excepts &= FE_ALL_EXCEPT; + __get_flags(r); + return (r & excepts); +} +DEF_STD(fetestexcept); + +/* + * The fegetround() function gets the current rounding direction. + */ +int +fegetround(void) +{ + fenv_t r; + + __get_frm(r); + return ((r >> _ROUND_SHIFT) & _ROUND_MASK); +} +DEF_STD(fegetround); + +/* + * The fesetround() function establishes the rounding direction represented by + * its argument `round'. If the argument is not equal to the value of a rounding + * direction macro, the rounding direction is not changed. + */ +int +fesetround(int round) +{ + fenv_t r; + + if (round & ~_ROUND_MASK) + return (-1); + __set_frm(round); + return (0); +} +DEF_STD(fesetround); + +/* + * The fegetenv() function attempts to store the current floating-point + * environment in the object pointed to by envp. + */ +int +fegetenv(fenv_t *envp) +{ + fenv_t r; + + __get_fcsr(r); + *envp = r; + + return (0); +} +DEF_STD(fegetenv); + +/* + * The feholdexcept() function saves the current floating-point environment + * in the object pointed to by envp, clears the floating-point status flags, and + * then installs a non-stop (continue on floating-point exceptions) mode, if + * available, for all floating-point exceptions. + */ +int +feholdexcept(fenv_t *envp) +{ + fenv_t r; + + __get_fcsr(r); + *envp = r; + r &= ~_ROUND_MASK; + __set_fcsr(r); + + return (0); +} +DEF_STD(feholdexcept); + +/* + * The fesetenv() function attempts to establish the floating-point environment + * represented by the object pointed to by envp. The argument `envp' points + * to an object set by a call to fegetenv() or feholdexcept(), or equal a + * floating-point environment macro. The fesetenv() function does not raise + * floating-point exceptions, but only installs the state of the floating-point + * status flags represented through its argument. + */ +int +fesetenv(const fenv_t *envp) +{ + + fenv_t r; + r = *envp; + __set_fcsr(r); + return (0); +} +DEF_STD(fesetenv); + +/* + * The feupdateenv() function saves the currently raised floating-point + * exceptions in its automatic storage, installs the floating-point environment + * represented by the object pointed to by `envp', and then raises the saved + * floating-point exceptions. The argument `envp' shall point to an object set + * by a call to feholdexcept() or fegetenv(), or equal a floating-point + * environment macro. + */ +int +feupdateenv(const fenv_t *envp) +{ + fexcept_t r; + + __get_fcsr(r); + fesetenv(envp); + feraiseexcept(r & FE_ALL_EXCEPT); + return (0); +} +DEF_STD(feupdateenv); + +/* + * The following functions are extentions to the standard + */ +int +feenableexcept(int mask) +{ + return -1; +} + +int +fedisableexcept(int mask) +{ + return 0; +} + +int +fegetexcept(void) +{ + return 0; +} -- 2.20.1