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RISC-V: Build Infastructure

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This patch lays out the top-level orginazition of the RISC-V port.  It
contains all the Implies files as well as various other fragments of
build infastructure for the RISC-V port.  This contains the only change
to a shared file: config.h.in.

RISC-V is a family of base ISAs with optional extensions.  The base ISAs
are RV32I and RV64I, which are 32-bit and 64-bit integer-only ISAs, but
this port currently only supports RV64I based systems.  Support for
RISC-V lives in in sysdeps/riscv.  In addition to these ISAs, our glibc
port supports most of the currently-defined extensions: the A extension
for atomics, the M extension for multiplication, the C extension for
compressed instructions, and the F/D extensions for single/double
precision IEEE floating-point.  Most of these extensions are handled by
GCC, but glibc defines various floating-point wrappers and emulation
routines as well as some atomic wrappers.

We support running glibc-based programs on Linux, the support for which
lives in sysdeps/unix/sysv/linux/riscv.

2018-01-29  Palmer Dabbelt  <palmer@sifive.com>

        * sysdeps/riscv/Implies: New file.
        * sysdeps/riscv/Makefile: Likewise.
        * sysdeps/riscv/configure: Likewise.
        * sysdeps/riscv/configure.ac: Likewise.
        * sysdeps/riscv/nptl/Makefile: Likewise.
        * sysdeps/riscv/preconfigure: Likewise.
        * sysdeps/riscv/rv64/Implies-after: Likewise.
        * sysdeps/riscv/rv64/rvd/Implies: Likewise.
        * sysdeps/riscv/rv64/rvf/Implies: Likewise.
        * sysdeps/unix/sysv/linux/riscv/Implies: Likewise.
        * sysdeps/unix/sysv/linux/riscv/Makefile: Likewise.
        * sysdeps/unix/sysv/linux/riscv/Versions: Likewise.
        * sysdeps/unix/sysv/linux/riscv/configure: Likewise.
        * sysdeps/unix/sysv/linux/riscv/configure.ac: Likewise.
        * sysdeps/unix/sysv/linux/riscv/ldd-rewrite.sed: Likewise.
        * sysdeps/unix/sysv/linux/riscv/rv64/Implies: Likewise.
        * sysdeps/unix/sysv/linux/riscv/rv64/Makefile: Likewise.
        * sysdeps/unix/sysv/linux/riscv/shlib-versions: Likewise.
This commit is contained in:
Palmer Dabbelt 2018-01-29 10:30:24 -08:00
parent 2268c4337c
commit c506155709
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GPG key ID: EF4CA1502CCBAB41
19 changed files with 451 additions and 0 deletions
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18
ChangeLog
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@ -144,6 +144,24 @@
* sysdeps/unix/sysv/linux/riscv/rv64/libnsl.abilist: Likewise.
* sysdeps/unix/sysv/linux/riscv/rv64/librt.abilist: Likewise.
* sysdeps/unix/sysv/linux/riscv/rv64/libutil.abilist: Likewise.
* sysdeps/riscv/Implies: New file.
* sysdeps/riscv/Makefile: Likewise.
* sysdeps/riscv/configure: Likewise.
* sysdeps/riscv/configure.ac: Likewise.
* sysdeps/riscv/nptl/Makefile: Likewise.
* sysdeps/riscv/preconfigure: Likewise.
* sysdeps/riscv/rv64/Implies-after: Likewise.
* sysdeps/riscv/rv64/rvd/Implies: Likewise.
* sysdeps/riscv/rv64/rvf/Implies: Likewise.
* sysdeps/unix/sysv/linux/riscv/Implies: Likewise.
* sysdeps/unix/sysv/linux/riscv/Makefile: Likewise.
* sysdeps/unix/sysv/linux/riscv/Versions: Likewise.
* sysdeps/unix/sysv/linux/riscv/configure: Likewise.
* sysdeps/unix/sysv/linux/riscv/configure.ac: Likewise.
* sysdeps/unix/sysv/linux/riscv/ldd-rewrite.sed: Likewise.
* sysdeps/unix/sysv/linux/riscv/rv64/Implies: Likewise.
* sysdeps/unix/sysv/linux/riscv/rv64/Makefile: Likewise.
* sysdeps/unix/sysv/linux/riscv/shlib-versions: Likewise.
2018-01-29 Florian Weimer <fweimer@redhat.com>

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@ -0,0 +1,5 @@
init_array
ieee754/ldbl-128
ieee754/dbl-64
ieee754/flt-32

7
sysdeps/riscv/Makefile Normal file
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@ -0,0 +1,7 @@
ifeq ($(subdir),misc)
sysdep_headers += sys/asm.h
endif
# RISC-V's assembler also needs to know about PIC as it changes the definition
# of some assembler macros.
ASFLAGS-.os += $(pic-ccflag)

4
sysdeps/riscv/configure vendored Normal file
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@ -0,0 +1,4 @@
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/riscv/elf.
$as_echo "#define PI_STATIC_AND_HIDDEN 1" >>confdefs.h

4
sysdeps/riscv/configure.ac Normal file
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@ -0,0 +1,4 @@
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/riscv/elf.
AC_DEFINE(PI_STATIC_AND_HIDDEN)

26
sysdeps/riscv/nptl/Makefile Normal file
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@ -0,0 +1,26 @@
# Makefile for sysdeps/riscv/nptl.
# Copyright (C) 2005-2018 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
#
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <http://www.gnu.org/licenses/>.
ifeq ($(subdir),csu)
gen-as-const-headers += tcb-offsets.sym
endif
ifeq ($(subdir),nptl)
libpthread-sysdep_routines += nptl-sysdep
libpthread-shared-only-routines += nptl-sysdep
endif

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sysdeps/riscv/preconfigure Normal file
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@ -0,0 +1,71 @@
case "$machine" in
riscv*)
xlen=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_xlen \(.*\)/\1/p'`
flen=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_flen \(.*\)/\1/p'`
float_abi=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_float_abi_\([^ ]*\) .*/\1/p'`
atomic=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | grep '#define __riscv_atomic' | cut -d' ' -f2`
case "$xlen" in
32)
echo "glibc does not yet support 32-bit systems" >&2
exit 1
;;
64)
;;
*)
echo "Unable to determine XLEN" >&2
exit 1
;;
esac
case "$flen" in
64)
float_machine=rvd
with_fp_cond=1
;;
32)
echo "glibc does not yet support systems with the F but not D extensions" >&2
exit 1
;;
"")
with_fp_cond=0
;;
*)
echo "Unable to determine FLEN" >&2
exit 1
;;
esac
case "$float_abi" in
soft)
abi_flen=0
;;
single)
echo "glibc does not yet support the single floating-point ABI" >&2
exit 1
;;
double)
abi_flen=64
;;
*)
echo "Unable to determine floating-point ABI" >&2
exit 1
;;
esac
case "$atomic" in
__riscv_atomic)
;;
*)
echo "glibc requires the A extension" >&2
exit 1
;;
esac
base_machine=riscv
machine=riscv/rv$xlen/$float_machine
$as_echo "#define RISCV_ABI_XLEN $xlen" >>confdefs.h
$as_echo "#define RISCV_ABI_FLEN $abi_flen" >>confdefs.h
;;
esac

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@ -0,0 +1 @@
wordsize-64

3
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@ -0,0 +1,3 @@
riscv/rv64/rvf
riscv/rvd
riscv/rvf

1
sysdeps/riscv/rv64/rvf/Implies Normal file
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@ -0,0 +1 @@
riscv/rvf

1
sysdeps/unix/sysv/linux/riscv/Implies Normal file
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@ -0,0 +1 @@
riscv/nptl

25
sysdeps/unix/sysv/linux/riscv/Makefile Normal file
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@ -0,0 +1,25 @@
ifeq ($(subdir),elf)
sysdep_routines += dl-vdso
ifeq ($(build-shared),yes)
# This is needed for DSO loading from static binaries.
sysdep-dl-routines += dl-static
endif
endif
ifeq ($(subdir),misc)
sysdep_headers += sys/cachectl.h
sysdep_routines += flush-icache
endif
ifeq ($(subdir),stdlib)
gen-as-const-headers += ucontext_i.sym
endif
abi-variants := lp64 lp64d
ifeq (,$(filter $(default-abi),$(abi-variants)))
$(error Unknown ABI $(default-abi), must be one of $(abi-variants))
endif
abi-lp64-condition := defined __LP64__ && defined __riscv_float_abi_soft
abi-lp64d-condition := defined __LP64__ && defined __riscv_float_abi_double

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sysdeps/unix/sysv/linux/riscv/Versions Normal file
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@ -0,0 +1,11 @@
ld {
GLIBC_PRIVATE {
# used for loading by static libraries
_dl_var_init;
}
}
libc {
GLIBC_2.27 {
__riscv_flush_icache;
}
}

219
sysdeps/unix/sysv/linux/riscv/configure vendored Executable file
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@ -0,0 +1,219 @@
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/unix/sysv/linux/riscv.
arch_minimum_kernel=4.15.0
libc_cv_riscv_int_abi=no
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5
$as_echo_n "checking for grep that handles long lines and -e... " >&6; }
if ${ac_cv_path_GREP+:} false; then :
$as_echo_n "(cached) " >&6
else
if test -z "$GREP"; then
ac_path_GREP_found=false
# Loop through the user's path and test for each of PROGNAME-LIST
as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
do
IFS=$as_save_IFS
test -z "$as_dir" && as_dir=.
for ac_prog in grep ggrep; do
for ac_exec_ext in '' $ac_executable_extensions; do
ac_path_GREP="$as_dir/$ac_prog$ac_exec_ext"
as_fn_executable_p "$ac_path_GREP" || continue
# Check for GNU ac_path_GREP and select it if it is found.
# Check for GNU $ac_path_GREP
case `"$ac_path_GREP" --version 2>&1` in
*GNU*)
ac_cv_path_GREP="$ac_path_GREP" ac_path_GREP_found=:;;
*)
ac_count=0
$as_echo_n 0123456789 >"conftest.in"
while :
do
cat "conftest.in" "conftest.in" >"conftest.tmp"
mv "conftest.tmp" "conftest.in"
cp "conftest.in" "conftest.nl"
$as_echo 'GREP' >> "conftest.nl"
"$ac_path_GREP" -e 'GREP$' -e '-(cannot match)-' < "conftest.nl" >"conftest.out" 2>/dev/null || break
diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
as_fn_arith $ac_count + 1 && ac_count=$as_val
if test $ac_count -gt ${ac_path_GREP_max-0}; then
# Best one so far, save it but keep looking for a better one
ac_cv_path_GREP="$ac_path_GREP"
ac_path_GREP_max=$ac_count
fi
# 10*(2^10) chars as input seems more than enough
test $ac_count -gt 10 && break
done
rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
esac
$ac_path_GREP_found && break 3
done
done
done
IFS=$as_save_IFS
if test -z "$ac_cv_path_GREP"; then
as_fn_error $? "no acceptable grep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
fi
else
ac_cv_path_GREP=$GREP
fi
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_GREP" >&5
$as_echo "$ac_cv_path_GREP" >&6; }
GREP="$ac_cv_path_GREP"
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for egrep" >&5
$as_echo_n "checking for egrep... " >&6; }
if ${ac_cv_path_EGREP+:} false; then :
$as_echo_n "(cached) " >&6
else
if echo a | $GREP -E '(a|b)' >/dev/null 2>&1
then ac_cv_path_EGREP="$GREP -E"
else
if test -z "$EGREP"; then
ac_path_EGREP_found=false
# Loop through the user's path and test for each of PROGNAME-LIST
as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
do
IFS=$as_save_IFS
test -z "$as_dir" && as_dir=.
for ac_prog in egrep; do
for ac_exec_ext in '' $ac_executable_extensions; do
ac_path_EGREP="$as_dir/$ac_prog$ac_exec_ext"
as_fn_executable_p "$ac_path_EGREP" || continue
# Check for GNU ac_path_EGREP and select it if it is found.
# Check for GNU $ac_path_EGREP
case `"$ac_path_EGREP" --version 2>&1` in
*GNU*)
ac_cv_path_EGREP="$ac_path_EGREP" ac_path_EGREP_found=:;;
*)
ac_count=0
$as_echo_n 0123456789 >"conftest.in"
while :
do
cat "conftest.in" "conftest.in" >"conftest.tmp"
mv "conftest.tmp" "conftest.in"
cp "conftest.in" "conftest.nl"
$as_echo 'EGREP' >> "conftest.nl"
"$ac_path_EGREP" 'EGREP$' < "conftest.nl" >"conftest.out" 2>/dev/null || break
diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
as_fn_arith $ac_count + 1 && ac_count=$as_val
if test $ac_count -gt ${ac_path_EGREP_max-0}; then
# Best one so far, save it but keep looking for a better one
ac_cv_path_EGREP="$ac_path_EGREP"
ac_path_EGREP_max=$ac_count
fi
# 10*(2^10) chars as input seems more than enough
test $ac_count -gt 10 && break
done
rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
esac
$ac_path_EGREP_found && break 3
done
done
done
IFS=$as_save_IFS
if test -z "$ac_cv_path_EGREP"; then
as_fn_error $? "no acceptable egrep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
fi
else
ac_cv_path_EGREP=$EGREP
fi
fi
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_EGREP" >&5
$as_echo "$ac_cv_path_EGREP" >&6; }
EGREP="$ac_cv_path_EGREP"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
__SIZEOF_INT__ __SIZEOF_LONG__ __SIZEOF_POINTER__
_ACEOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
$EGREP "4 8 8" >/dev/null 2>&1; then :
libc_cv_riscv_int_abi=lp64
fi
rm -f conftest*
if test $libc_cv_riscv_int_abi = no; then
as_fn_error $? "Unable to determine integer ABI" "$LINENO" 5
fi
libc_cv_riscv_float_abi=no
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#ifdef __riscv_float_abi_double
yes
#endif
_ACEOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
$EGREP "yes" >/dev/null 2>&1; then :
libc_cv_riscv_float_abi=d
fi
rm -f conftest*
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#ifdef __riscv_float_abi_soft
yes
#endif
_ACEOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
$EGREP "yes" >/dev/null 2>&1; then :
libc_cv_riscv_float_abi=
fi
rm -f conftest*
if test $libc_cv_riscv_float_abi = no; then
as_fn_error $? "Unable to determine floating-point ABI" "$LINENO" 5
fi
config_vars="$config_vars
default-abi = $libc_cv_riscv_int_abi$libc_cv_riscv_float_abi"
case $libc_cv_riscv_int_abi$libc_cv_riscv_float_abi-$machine in
lp64-riscv/rv64/*)
test -n "$libc_cv_slibdir" ||
case "$prefix" in
/usr | /usr/)
libc_cv_slibdir='/lib64/lp64'
libc_cv_rtlddir='/lib'
if test "$libdir" = '${exec_prefix}/lib'; then
libdir='${exec_prefix}/lib64/lp64';
# Locale data can be shared between 32-bit and 64-bit libraries.
libc_cv_complocaledir='${exec_prefix}/lib/locale'
fi
;;
esac
;;
lp64d-riscv/rv64/*)
test -n "$libc_cv_slibdir" ||
case "$prefix" in
/usr | /usr/)
libc_cv_slibdir='/lib64/lp64d'
libc_cv_rtlddir='/lib'
if test "$libdir" = '${exec_prefix}/lib'; then
libdir='${exec_prefix}/lib64/lp64d';
# Locale data can be shared between 32-bit and 64-bit libraries.
libc_cv_complocaledir='${exec_prefix}/lib/locale'
fi
;;
esac
;;
esac
ldd_rewrite_script=sysdeps/unix/sysv/linux/riscv/ldd-rewrite.sed

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sinclude(./aclocal.m4)dnl Autoconf lossage
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/unix/sysv/linux/riscv.
arch_minimum_kernel=4.15.0
libc_cv_riscv_int_abi=no
AC_EGREP_CPP(4 8 8, [__SIZEOF_INT__ __SIZEOF_LONG__ __SIZEOF_POINTER__
], libc_cv_riscv_int_abi=lp64)
if test $libc_cv_riscv_int_abi = no; then
AC_MSG_ERROR([Unable to determine integer ABI])
fi
libc_cv_riscv_float_abi=no
AC_EGREP_CPP(yes, [#ifdef __riscv_float_abi_double
yes
#endif
],libc_cv_riscv_float_abi=d)
AC_EGREP_CPP(yes, [#ifdef __riscv_float_abi_soft
yes
#endif
],libc_cv_riscv_float_abi=)
if test $libc_cv_riscv_float_abi = no; then
AC_MSG_ERROR([Unable to determine floating-point ABI])
fi
LIBC_CONFIG_VAR([default-abi], [$libc_cv_riscv_int_abi$libc_cv_riscv_float_abi])
case $libc_cv_riscv_int_abi$libc_cv_riscv_float_abi-$machine in
lp64-riscv/rv64/*)
LIBC_SLIBDIR_RTLDDIR([lib64/lp64], [lib])
;;
lp64d-riscv/rv64/*)
LIBC_SLIBDIR_RTLDDIR([lib64/lp64d], [lib])
;;
esac
ldd_rewrite_script=sysdeps/unix/sysv/linux/riscv/ldd-rewrite.sed

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s_^\(RTLDLIST=\)\(.*lib/\)\(ld-linux\)-\(riscv64\)-\(lp64\)\(d*\)\(\.so\.[0-9.]*\)_\1"\2\3-\4-\5\7 \2\3-\4-\5d\7"_

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@ -0,0 +1,3 @@
unix/sysv/linux/riscv
unix/sysv/linux/generic
unix/sysv/linux/wordsize-64

4
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@ -0,0 +1,4 @@
ifeq ($(subdir),socket)
CFLAGS-recv.c += -fexceptions
CFLAGS-send.c += -fexceptions
endif

9
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DEFAULT GLIBC_2.27
%if RISCV_ABI_XLEN == 64 && RISCV_ABI_FLEN == 64
ld=ld-linux-riscv64-lp64d.so.1
%elif RISCV_ABI_XLEN == 64 && RISCV_ABI_FLEN == 0
ld=ld-linux-riscv64-lp64.so.1
%else
%error cannot determine ABI
%endif