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c506155709
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.
72 lines
1.4 KiB
Plaintext
72 lines
1.4 KiB
Plaintext
case "$machine" in
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riscv*)
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xlen=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_xlen \(.*\)/\1/p'`
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flen=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_flen \(.*\)/\1/p'`
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float_abi=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_float_abi_\([^ ]*\) .*/\1/p'`
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atomic=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | grep '#define __riscv_atomic' | cut -d' ' -f2`
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case "$xlen" in
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32)
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echo "glibc does not yet support 32-bit systems" >&2
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exit 1
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;;
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64)
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;;
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*)
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echo "Unable to determine XLEN" >&2
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exit 1
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;;
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esac
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case "$flen" in
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64)
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float_machine=rvd
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with_fp_cond=1
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;;
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32)
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echo "glibc does not yet support systems with the F but not D extensions" >&2
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exit 1
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;;
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"")
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with_fp_cond=0
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;;
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*)
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echo "Unable to determine FLEN" >&2
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exit 1
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;;
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esac
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case "$float_abi" in
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soft)
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abi_flen=0
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;;
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single)
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echo "glibc does not yet support the single floating-point ABI" >&2
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exit 1
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;;
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double)
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abi_flen=64
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;;
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*)
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echo "Unable to determine floating-point ABI" >&2
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exit 1
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;;
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esac
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case "$atomic" in
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__riscv_atomic)
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;;
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*)
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echo "glibc requires the A extension" >&2
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exit 1
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;;
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esac
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base_machine=riscv
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machine=riscv/rv$xlen/$float_machine
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$as_echo "#define RISCV_ABI_XLEN $xlen" >>confdefs.h
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$as_echo "#define RISCV_ABI_FLEN $abi_flen" >>confdefs.h
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;;
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esac
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