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.

1 files changed, 219 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/riscv/configure b/sysdeps/unix/sysv/linux/riscv/configure
new file mode 100755
index 0000000000..816e9145eb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/configure
@@ -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