glibc/sysdeps/riscv/preconfigure
Palmer Dabbelt c506155709
RISC-V: Build Infastructure
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.
2018-01-29 10:43:15 -08:00

72 lines
1.4 KiB
Plaintext

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