SPARC fenv support

Signed-off-by: Eshan dhawan <eshandhawan51@gmail.com>

newlib/configure.host

@@ -322,6 +322,7 @@ case "${host_cpu}" in
 	machine_dir=sh
 	;;
   sparc*)
+	libm_machine_dir=sparc
 	machine_dir=sparc
 	# FIXME: Might wish to make MALLOC_ALIGNMENT more generic.
 	newlib_cflags="${newlib_cflags} -DMALLOC_ALIGNMENT=8"

newlib/libc/machine/sparc/sys/fenv.h

@@ -0,0 +1,85 @@
+/*	$NetBSD: fenv.h,v 1.2 2017/01/14 12:00:13 martin Exp $	*/
+
+/*-
+ * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_SYS_FENV_H_
+#define	_SYS_FENV_H_
+
+#include <stdint.h>
+
+#ifdef __arch64__
+typedef	uint64_t	fenv_t;
+typedef	uint64_t	fexcept_t;
+#else
+typedef	uint32_t	fenv_t;
+typedef	uint32_t	fexcept_t;
+#endif
+
+/*
+ * Exception flags
+ *
+ * Symbols are defined in such a way, to correspond to the accrued
+ * exception bits (aexc) fields of FSR.
+ */
+#define	FE_INEXACT      0x00000020	/* 0000100000 */
+#define	FE_DIVBYZERO    0x00000040	/* 0001000000 */
+#define	FE_UNDERFLOW    0x00000080	/* 0010000000 */
+#define	FE_OVERFLOW     0x00000100	/* 0100000000 */
+#define	FE_INVALID	0x00000200	/* 1000000000 */
+
+#define	FE_ALL_EXCEPT	(FE_DIVBYZERO | FE_INEXACT | \
+    FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+
+/*
+ * Rounding modes
+ *
+ * We can't just use the hardware bit values here, because that would
+ * make FE_UPWARD and FE_DOWNWARD negative, which is not allowed.
+ */
+#define	FE_TONEAREST	0	/* round to nearest representable number */
+#define	FE_TOWARDZERO	1	/* round to zero (truncate) */
+#define	FE_UPWARD	2	/* round toward positive infinity */
+#define	FE_DOWNWARD	3	/* round toward negative infinity */
+#define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \
+    FE_UPWARD | FE_TOWARDZERO)
+#define	_ROUND_SHIFT	30
+
+
+
+/* Default floating-point environment */
+extern const fenv_t *_fe_dfl_env;
+#define FE_DFL_ENV _fe_dfl_env
+
+/* We need to be able to map status flag positions to mask flag positions */
+#define	_FPUSW_SHIFT	18
+#define	_ENABLE_MASK	(FE_ALL_EXCEPT << _FPUSW_SHIFT)
+
+
+
+#endif	/* !_SYS_FENV_H_ */

newlib/libm/machine/configure.in

@@ -34,6 +34,7 @@ if test -n "${libm_machine_dir}"; then
 	riscv) AC_CONFIG_SUBDIRS(riscv) ;;
 	x86_64) AC_CONFIG_SUBDIRS(x86_64) ;;
 	powerpc) AC_CONFIG_SUBDIRS(powerpc) ;;
+	sparc) AC_CONFIG_SUBDIRS(sparc) ;;
   esac;
   if test "${use_libtool}" = "yes"; then
     machlib=${libm_machine_dir}/lib${libm_machine_dir}.${aext}

newlib/libm/machine/sparc/Makefile.am

@@ -0,0 +1,21 @@
+## Process this file with automake to generate Makefile.in
+
+INCLUDES = -I $(newlib_basedir)/../newlib/libm/common $(NEWLIB_CFLAGS) \
+	$(CROSS_CFLAGS) $(TARGET_CFLAGS)
+
+LIB_SOURCES = \
+	feclearexcept.c  fegetenv.c fegetexceptflag.c \
+	fegetround.c feholdexcept.c feraiseexcept.c fesetenv.c \
+	fesetexceptflag.c fesetround.c fetestexcept.c feupdateenv.c \
+	fenv.c
+
+noinst_LIBRARIES = lib.a
+lib_a_SOURCES = $(LIB_SOURCES)
+lib_a_CFLAGS = $(AM_CFLAGS)
+lib_a_CCASFLAGS = $(AM_CCASFLAGS)
+noinst_DATA =
+
+include $(srcdir)/../../../Makefile.shared
+
+ACLOCAL_AMFLAGS = -I ../../.. -I ../../../..
+CONFIG_STATUS_DEPENDENCIES = $(newlib_basedir)/configure.host

newlib/libm/machine/sparc/configure.in

@@ -0,0 +1,11 @@
+
+AC_PREREQ(2.59)
+AC_INIT([newlib],[NEWLIB_VERSION])
+AC_CONFIG_SRCDIR([Makefile.am])
+
+AC_CONFIG_AUX_DIR(../../../..)
+
+NEWLIB_CONFIGURE(../../..)
+
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT

newlib/libm/machine/sparc/feclearexcept.c

@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <joel@rtems.org>
+ */
+
+#include "../../fenv/fenv_stub.c"

newlib/libm/machine/sparc/fegetenv.c

@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <joel@rtems.org>
+ */
+
+#include "../../fenv/fenv_stub.c"

newlib/libm/machine/sparc/fegetexceptflag.c

@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <joel@rtems.org>
+ */
+
+#include "../../fenv/fenv_stub.c"

newlib/libm/machine/sparc/fegetround.c

@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <joel@rtems.org>
+ */
+
+#include "../../fenv/fenv_stub.c"

newlib/libm/machine/sparc/feholdexcept.c

@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <joel@rtems.org>
+ */
+
+#include "../../fenv/fenv_stub.c"

newlib/libm/machine/sparc/fenv.c

@@ -0,0 +1,350 @@
+/*	$NetBSD: fenv.c,v 1.2 2017/03/22 23:11:09 chs Exp $	*/
+
+/*-
+ * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
+ * 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
+ */
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: fenv.c,v 1.2 2017/03/22 23:11:09 chs Exp $");
+
+
+
+#include <assert.h>
+#include <fenv.h>
+
+#define _DIAGASSERT(x) assert(x)
+
+#ifdef __weak_alias
+__weak_alias(feclearexcept,_feclearexcept)
+__weak_alias(fedisableexcept,_fedisableexcept)
+__weak_alias(feenableexcept,_feenableexcept)
+__weak_alias(fegetenv,_fegetenv)
+__weak_alias(fegetexcept,_fegetexcept)
+__weak_alias(fegetexceptflag,_fegetexceptflag)
+__weak_alias(fegetround,_fegetround)
+__weak_alias(feholdexcept,_feholdexcept)
+__weak_alias(feraiseexcept,_feraiseexcept)
+__weak_alias(fesetenv,_fesetenv)
+__weak_alias(fesetexceptflag,_fesetexceptflag)
+__weak_alias(fesetround,_fesetround)
+__weak_alias(fetestexcept,_fetestexcept)
+__weak_alias(feupdateenv,_feupdateenv)
+#endif
+
+/* Load floating-point state register (32bits) */
+#define	__ldfsr(__r)	__asm__	__volatile__		\
+	("ld %0, %%fsr" : : "m" (__r))
+
+/* Save floating-point state register (32bits) */
+#define	__stfsr(__r)	__asm__	__volatile__		\
+	("st %%fsr, %0" : "=m" (*(__r)))
+
+/*
+ * The feclearexcept() function clears the supported floating-point exceptions
+ * represented by `excepts'.
+ */
+int
+feclearexcept(int excepts)
+{
+	fexcept_t r;
+	int ex;
+
+	_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+	ex = excepts & FE_ALL_EXCEPT;
+
+	__stfsr(&r);
+	r &= ~ex;
+	__ldfsr(r);
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * 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;
+	int ex;
+
+	_DIAGASSERT(flagp != NULL);
+	_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+	ex = excepts & FE_ALL_EXCEPT;
+
+	__stfsr(&r);
+	*flagp = r & ex;
+
+	/* Success */
+	return 0;
+}
+
+
+/*
+ * 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;
+	int ex;
+
+	_DIAGASSERT(flagp != NULL);
+	_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+	ex = excepts & FE_ALL_EXCEPT;
+
+	__stfsr(&r);
+	r &= ~ex;
+	r |= *flagp & ex;
+	__ldfsr(r);
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * The feraiseexcept() function raises the supported floating-point exceptions
+ * represented by the argument `excepts'.
+ *
+ * The order in which these floating-point exceptions are raised is unspecified
+ * (by the standard).
+ */
+int
+feraiseexcept(int excepts)
+{
+	volatile double d;
+	int ex;
+
+	_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+	ex = excepts & FE_ALL_EXCEPT;
+
+	/*
+	 * With a compiler that supports the FENV_ACCESS pragma properly, simple
+	 * expressions like '0.0 / 0.0' should be sufficient to generate traps.
+	 * Unfortunately, we need to bring a volatile variable into the equation
+	 * to prevent incorrect optimizations.
+	 */
+	if (ex & FE_INVALID) {
+		d = 0.0;
+		d = 0.0 / d;
+	}
+	if (ex & FE_DIVBYZERO) {
+		d = 0.0;
+		d = 1.0 / d;
+	}
+	if (ex & FE_OVERFLOW) {
+		d = 0x1.ffp1023;
+		d *= 2.0;
+	}
+	if (ex & FE_UNDERFLOW) {
+		d = 0x1p-1022;
+		d /= 0x1p1023;
+	}
+	if (ex & FE_INEXACT) {
+		d = 0x1p-1022;
+		d += 1.0;
+	}
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * 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;
+
+	_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+	__stfsr(&r);
+
+	return r & (excepts & FE_ALL_EXCEPT);
+}
+
+/*
+ * The fegetround() function gets the current rounding direction.
+ */
+int
+fegetround(void)
+{
+	fenv_t r;
+
+	__stfsr(&r);
+
+	return (r >> _ROUND_SHIFT) & _ROUND_MASK;
+}
+
+/*
+ * 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;
+
+	_DIAGASSERT((round & ~_ROUND_MASK) == 0);
+	if (round & ~_ROUND_MASK)
+		return -1;
+
+	__stfsr(&r);
+	r &= ~(_ROUND_MASK << _ROUND_SHIFT);
+	r |= round << _ROUND_SHIFT;
+	__ldfsr(r);
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * The fegetenv() function attempts to store the current floating-point
+ * environment in the object pointed to by envp.
+ */
+int
+fegetenv(fenv_t *envp)
+{
+	_DIAGASSERT(envp != NULL);
+
+	__stfsr(envp);
+
+	/* Success */
+	return 0;
+}
+
+
+/*
+ * 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;
+
+	_DIAGASSERT(envp != NULL);
+
+	__stfsr(&r);
+	*envp = r;
+	r &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
+	__ldfsr(r);
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * 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)
+{
+	_DIAGASSERT(envp != NULL);
+
+	__ldfsr(*envp);
+
+	/* Success */
+	return 0;
+}
+
+
+/*
+ * 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;
+
+	_DIAGASSERT(envp != NULL);
+
+	__stfsr(&r);
+	__ldfsr(*envp);
+
+	_DIAGASSERT((r & ~FE_ALL_EXCEPT) == 0);
+	feraiseexcept(r & FE_ALL_EXCEPT);
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * The following functions are extentions to the standard
+ */
+int
+feenableexcept(int mask)
+{
+	fenv_t old_r, new_r;
+
+	__stfsr(&old_r);
+	new_r = old_r | ((mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
+	__ldfsr(new_r);
+
+	return (old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT;
+}
+
+int
+fedisableexcept(int mask)
+{
+	fenv_t old_r, new_r;
+
+	__stfsr(&old_r);
+	new_r = old_r & ~((mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
+	__ldfsr(new_r);
+
+	return (old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT;
+}
+
+int
+fegetexcept(void)
+{
+	fenv_t r;
+
+	__stfsr(&r);
+	return (r & _ENABLE_MASK) >> _FPUSW_SHIFT;
+}

newlib/libm/machine/sparc/feraiseexcept.c

@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <joel@rtems.org>
+ */
+
+#include "../../fenv/fenv_stub.c"

newlib/libm/machine/sparc/fesetenv.c

@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <joel@rtems.org>
+ */
+
+#include "../../fenv/fenv_stub.c"

newlib/libm/machine/sparc/fesetexceptflag.c

@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <joel@rtems.org>
+ */
+
+#include "../../fenv/fenv_stub.c"

newlib/libm/machine/sparc/fesetround.c

@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <joel@rtems.org>
+ */
+
+#include "../../fenv/fenv_stub.c"

newlib/libm/machine/sparc/fetestexcept.c

@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <joel@rtems.org>
+ */
+
+#include "../../fenv/fenv_stub.c"

newlib/libm/machine/sparc/feupdateenv.c

@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <joel@rtems.org>
+ */
+
+#include "../../fenv/fenv_stub.c"