2018-12-21 01:48:04 +00:00
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/* FPU control word bits. C-SKY version.
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2022-01-01 18:54:23 +00:00
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Copyright (C) 2018-2022 Free Software Foundation, Inc.
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2018-12-21 01:48:04 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2018-12-21 01:48:04 +00:00
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#ifndef _FPU_CONTROL_H
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#define _FPU_CONTROL_H
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/* C-SKY FPU floating point control register bits.
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31-28 -> Reserved (read as 0, write with 0).
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27 -> 0: Flush denormalized results to zero.
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1: Flush denormalized results to signed minimal normal number.
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26 -> Reserved (read as 0, write with 0).
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25-24 -> Rounding control.
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23-6 -> Reserved (read as 0, write with 0).
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5 -> Enable exception for input denormalized exception.
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4 -> Enable exception for inexact exception.
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3 -> Enable exception for underflow exception.
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2 -> Enable exception for overflow exception.
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1 -> Enable exception for division by zero exception.
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0 -> Enable exception for invalid operation exception.
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Rounding Control:
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00 - Rounding to nearest (RN).
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01 - Rounding toward zero (RZ).
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10 - Rounding (up) toward plus infinity (RP).
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11 - Rounding (down)toward minus infinity (RM).
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C-SKY FPU floating point exception status register bits.
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15 -> Accumulate bit for any exception.
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14 -> Reserved (read as 0, write with 0).
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13 -> Cause bit for input denormalized exception.
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12 -> Cause bit for inexact exception.
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11 -> Cause bit for underflow exception.
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10 -> Cause bit for overflow exception.
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9 -> Cause bit for division by zero exception.
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8 -> Cause bit for invalid operation exception.
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7 -> Flag bit for any exception.
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6 -> Reserved (read as 0, write with 0).
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5 -> Flag exception for input denormalized exception.
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4 -> Flag exception for inexact exception.
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3 -> Flag exception for underflow exception.
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2 -> Flag exception for overflow exception.
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1 -> Flag exception for division by zero exception.
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0 -> Flag exception for invalid operation exception. */
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#include <features.h>
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#ifdef __csky_soft_float__
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# define _FPU_RESERVED 0xffffffff
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# define _FPU_DEFAULT 0x00000000
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typedef unsigned int fpu_control_t;
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# define _FPU_GETCW(cw) (cw) = 0
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# define _FPU_SETCW(cw) (void) (cw)
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# define _FPU_GETFPSR(cw) (cw) = 0
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# define _FPU_SETFPSR(cw) (void) (cw)
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extern fpu_control_t __fpu_control;
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#else /* __csky_soft_float__ */
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/* Masking of interrupts. */
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# define _FPU_MASK_IDE (1 << 5) /* Input denormalized exception. */
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# define _FPU_MASK_IXE (1 << 4) /* Inexact exception. */
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# define _FPU_MASK_UFE (1 << 3) /* Underflow exception. */
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# define _FPU_MASK_OFE (1 << 2) /* Overflow exception. */
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# define _FPU_MASK_DZE (1 << 1) /* Division by zero exception. */
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# define _FPU_MASK_IOE (1 << 0) /* Invalid operation exception. */
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# define _FPU_MASK_FEA (1 << 15) /* Case for any exception. */
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# define _FPU_MASK_FEC (1 << 7) /* Flag for any exception. */
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/* Flush denormalized numbers to zero. */
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# define _FPU_FLUSH_TZ 0x8000000
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/* Rounding control. */
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# define _FPU_RC_NEAREST (0x0 << 24) /* RECOMMENDED. */
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# define _FPU_RC_ZERO (0x1 << 24)
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# define _FPU_RC_UP (0x2 << 24)
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# define _FPU_RC_DOWN (0x3 << 24)
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# define _FPU_RESERVED 0xf460ffc0 /* Reserved bits in cw. */
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# define _FPU_FPSR_RESERVED 0xffff4040
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/* The fdlibm code requires strict IEEE double precision arithmetic,
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and no interrupts for exceptions, rounding to nearest. */
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# define _FPU_DEFAULT 0x00000000
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# define _FPU_FPSR_DEFAULT 0x00000000
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/* IEEE: same as above, but exceptions. */
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# define _FPU_FPCR_IEEE 0x0000001F
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# define _FPU_FPSR_IEEE 0x00000000
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/* Type of the control word. */
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typedef unsigned int fpu_control_t;
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/* Macros for accessing the hardware control word. */
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# if (__CSKY__ == 2)
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# define _FPU_GETCW(cw) __asm__ volatile ("mfcr %0, cr<1, 2>" : "=a" (cw))
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# define _FPU_SETCW(cw) __asm__ volatile ("mtcr %0, cr<1, 2>" : : "a" (cw))
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# define _FPU_GETFPSR(cw) __asm__ volatile ("mfcr %0, cr<2, 2>" : "=a" (cw))
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# define _FPU_SETFPSR(cw) __asm__ volatile ("mtcr %0, cr<2, 2>" : : "a" (cw))
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# else
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# define _FPU_GETCW(cw) __asm__ volatile ("1: cprcr %0, cpcr2 \n" \
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" btsti %0, 31 \n" \
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" bt 1b \n" \
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" cprcr %0, cpcr1\n" : "=b" (cw))
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# define _FPU_SETCW(cw) __asm__ volatile ("1: cprcr r7, cpcr2 \n" \
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" btsti r7, 31 \n" \
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" bt 1b \n" \
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" cpwcr %0, cpcr1 \n" \
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: : "b" (cw) : "r7")
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# define _FPU_GETFPSR(cw) __asm__ volatile ("1: cprcr %0, cpcr2 \n" \
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" btsti %0, 31 \n" \
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" bt 1b \n" \
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" cprcr %0, cpcr4\n" : "=b" (cw))
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# define _FPU_SETFPSR(cw) __asm__ volatile ("1: cprcr r7, cpcr2 \n" \
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" btsti r7, 31 \n" \
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" bt 1b \n" \
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" cpwcr %0, cpcr4 \n" \
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: : "b" (cw) : "r7")
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# endif /* __CSKY__ != 2 */
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/* Default control word set at startup. */
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extern fpu_control_t __fpu_control;
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#endif /* !__csky_soft_float__ */
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#endif /* fpu_control.h */
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