[PATCH 01/12] RISC-V: Build Infastructure

[Palmer Dabbelt <palmer at dabbelt dot com>]

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.
Support for these live in sysdeps/riscv/rv{32,64}.  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
(in sysdeps/riscv/rv{32,64}/rv{f,d}) and emulation routines (in
sysdeps/riscv/soft-fp).

We support running glibc-based programs on Linux, the suppor for which
lives in sysdeps/unix/sysv/linux/riscv.
---
 config.h.in                                  |  5 ++
 sysdeps/riscv/Implies                        |  6 ++
 sysdeps/riscv/Makefile                       | 45 +++++++++++++++
 sysdeps/riscv/Versions                       |  5 ++
 sysdeps/riscv/configure                      | 86 ++++++++++++++++++++++++++++
 sysdeps/riscv/configure.in                   |  4 ++
 sysdeps/riscv/nptl/Makefile                  | 25 ++++++++
 sysdeps/riscv/preconfigure                   | 50 ++++++++++++++++
 sysdeps/riscv/rv32/Implies-after             |  1 +
 sysdeps/riscv/rv32/rvd/Implies               |  2 +
 sysdeps/riscv/rv32/rvf/Implies               |  1 +
 sysdeps/riscv/rv64/Implies-after             |  1 +
 sysdeps/riscv/rv64/rvd/Implies               |  2 +
 sysdeps/riscv/rv64/rvf/Implies               |  1 +
 sysdeps/riscv/soft-fp/Makefile               |  3 +
 sysdeps/unix/sysv/linux/riscv/Implies        |  1 +
 sysdeps/unix/sysv/linux/riscv/Makefile       | 26 +++++++++
 sysdeps/unix/sysv/linux/riscv/configure      |  7 +++
 sysdeps/unix/sysv/linux/riscv/configure.in   |  8 +++
 sysdeps/unix/sysv/linux/riscv/rv32/Implies   |  3 +
 sysdeps/unix/sysv/linux/riscv/rv64/Implies   |  3 +
 sysdeps/unix/sysv/linux/riscv/rv64/Makefile  |  9 +++
 sysdeps/unix/sysv/linux/riscv/shlib-versions | 17 ++++++
 23 files changed, 311 insertions(+)
 create mode 100644 sysdeps/riscv/Implies
 create mode 100644 sysdeps/riscv/Makefile
 create mode 100644 sysdeps/riscv/Versions
 create mode 100644 sysdeps/riscv/configure
 create mode 100644 sysdeps/riscv/configure.in
 create mode 100644 sysdeps/riscv/nptl/Makefile
 create mode 100644 sysdeps/riscv/preconfigure
 create mode 100644 sysdeps/riscv/rv32/Implies-after
 create mode 100644 sysdeps/riscv/rv32/rvd/Implies
 create mode 100644 sysdeps/riscv/rv32/rvf/Implies
 create mode 100644 sysdeps/riscv/rv64/Implies-after
 create mode 100644 sysdeps/riscv/rv64/rvd/Implies
 create mode 100644 sysdeps/riscv/rv64/rvf/Implies
 create mode 100644 sysdeps/riscv/soft-fp/Makefile
 create mode 100644 sysdeps/unix/sysv/linux/riscv/Implies
 create mode 100644 sysdeps/unix/sysv/linux/riscv/Makefile
 create mode 100644 sysdeps/unix/sysv/linux/riscv/configure
 create mode 100644 sysdeps/unix/sysv/linux/riscv/configure.in
 create mode 100644 sysdeps/unix/sysv/linux/riscv/rv32/Implies
 create mode 100644 sysdeps/unix/sysv/linux/riscv/rv64/Implies
 create mode 100644 sysdeps/unix/sysv/linux/riscv/rv64/Makefile
 create mode 100644 sysdeps/unix/sysv/linux/riscv/shlib-versions

diff --git a/config.h.in b/config.h.in
index 22418576a0..f870267870 100644
--- a/config.h.in
+++ b/config.h.in
@@ -99,6 +99,11 @@
 /* AArch64 big endian ABI */
 #undef HAVE_AARCH64_BE
 
+/* RISC-V integer ABI for ld.so.  */
+#undef RISCV_ABI_XLEN
+
+/* RISC-V floating-point ABI for ld.so.  */
+#undef RISCV_ABI_FLEN
 
 /* Defined to some form of __attribute__ ((...)) if the compiler supports
    a different, more efficient calling convention.  */
diff --git a/sysdeps/riscv/Implies b/sysdeps/riscv/Implies
new file mode 100644
index 0000000000..15b9e02448
--- /dev/null
+++ b/sysdeps/riscv/Implies
@@ -0,0 +1,6 @@
+init_array
+
+ieee754/ldbl-128
+ieee754/dbl-64
+ieee754/flt-32
+riscv/soft-fp
diff --git a/sysdeps/riscv/Makefile b/sysdeps/riscv/Makefile
new file mode 100644
index 0000000000..5a699a2e64
--- /dev/null
+++ b/sysdeps/riscv/Makefile
@@ -0,0 +1,45 @@
+ifneq ($(all-rtld-routines),)
+CFLAGS-rtld.c += -mno-plt
+CFLAGS-dl-load.c += -mno-plt
+CFLAGS-dl-cache.c += -mno-plt
+CFLAGS-dl-lookup.c += -mno-plt
+CFLAGS-dl-object.c += -mno-plt
+CFLAGS-dl-reloc.c += -mno-plt
+CFLAGS-dl-deps.c += -mno-plt
+CFLAGS-dl-runtime.c += -mno-plt
+CFLAGS-dl-error.c += -mno-plt
+CFLAGS-dl-init.c += -mno-plt
+CFLAGS-dl-fini.c += -mno-plt
+CFLAGS-dl-debug.c += -mno-plt
+CFLAGS-dl-misc.c += -mno-plt
+CFLAGS-dl-version.c += -mno-plt
+CFLAGS-dl-profile.c += -mno-plt
+CFLAGS-dl-conflict.c += -mno-plt
+CFLAGS-dl-tls.c += -mno-plt
+CFLAGS-dl-origin.c += -mno-plt
+CFLAGS-dl-scope.c += -mno-plt
+CFLAGS-dl-execstack.c += -mno-plt
+CFLAGS-dl-caller.c += -mno-plt
+CFLAGS-dl-open.c += -mno-plt
+CFLAGS-dl-close.c += -mno-plt
+CFLAGS-dl-sysdep.c += -mno-plt
+CFLAGS-dl-environ.c += -mno-plt
+CFLAGS-dl-minimal.c += -mno-plt
+CFLAGS-dl-static.c += -mno-plt
+CFLAGS-dl-brk.c += -mno-plt
+CFLAGS-dl-sbrk.c += -mno-plt
+CFLAGS-dl-getcwd.c += -mno-plt
+CFLAGS-dl-openat64.c += -mno-plt
+CFLAGS-dl-opendir.c += -mno-plt
+CFLAGS-dl-fxstatat64.c += -mno-plt
+endif
+
+CFLAGS-closedir.c += -mno-plt
+CFLAGS-exit.c += -mno-plt
+CFLAGS-cxa_atexit.c += -mno-plt
+
+ifeq ($(subdir),misc)
+sysdep_headers += sys/asm.h
+endif
+
+ASFLAGS-.os += $(pic-ccflag)
diff --git a/sysdeps/riscv/Versions b/sysdeps/riscv/Versions
new file mode 100644
index 0000000000..5a0c2d23f8
--- /dev/null
+++ b/sysdeps/riscv/Versions
@@ -0,0 +1,5 @@
+libc {
+  GLIBC_2.14 {
+    __memcpy_g;
+  }
+}
diff --git a/sysdeps/riscv/configure b/sysdeps/riscv/configure
new file mode 100644
index 0000000000..9f790ec527
--- /dev/null
+++ b/sysdeps/riscv/configure
@@ -0,0 +1,86 @@
+
+# as_fn_set_status STATUS
+# -----------------------
+# Set $? to STATUS, without forking.
+as_fn_set_status ()
+{
+  return $1
+} # as_fn_set_status
+
+# as_fn_exit STATUS
+# -----------------
+# Exit the shell with STATUS, even in a "trap 0" or "set -e" context.
+as_fn_exit ()
+{
+  set +e
+  as_fn_set_status $1
+  exit $1
+} # as_fn_exit
+if expr a : '\(a\)' >/dev/null 2>&1 &&
+   test "X`expr 00001 : '.*\(...\)'`" = X001; then
+  as_expr=expr
+else
+  as_expr=false
+fi
+
+if (basename -- /) >/dev/null 2>&1 && test "X`basename -- / 2>&1`" = "X/"; then
+  as_basename=basename
+else
+  as_basename=false
+fi
+
+as_me=`$as_basename -- "$0" ||
+$as_expr X/"$0" : '.*/\([^/][^/]*\)/*$' \| \
+	 X"$0" : 'X\(//\)$' \| \
+	 X"$0" : 'X\(/\)' \| . 2>/dev/null ||
+$as_echo X/"$0" |
+    sed '/^.*\/\([^/][^/]*\)\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\/\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\/\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+
+
+  as_lineno_1=$LINENO as_lineno_1a=$LINENO
+  as_lineno_2=$LINENO as_lineno_2a=$LINENO
+  eval 'test "x$as_lineno_1'$as_run'" != "x$as_lineno_2'$as_run'" &&
+  test "x`expr $as_lineno_1'$as_run' + 1`" = "x$as_lineno_2'$as_run'"' || {
+  # Blame Lee E. McMahon (1931-1989) for sed's syntax.  :-)
+  sed -n '
+    p
+    /[$]LINENO/=
+  ' <$as_myself |
+    sed '
+      s/[$]LINENO.*/&-/
+      t lineno
+      b
+      :lineno
+      N
+      :loop
+      s/[$]LINENO\([^'$as_cr_alnum'_].*\n\)\(.*\)/\2\1\2/
+      t loop
+      s/-\n.*//
+    ' >$as_me.lineno &&
+  chmod +x "$as_me.lineno" ||
+    { $as_echo "$as_me: error: cannot create $as_me.lineno; rerun with a POSIX shell" >&2; as_fn_exit 1; }
+
+  # Don't try to exec as it changes $[0], causing all sort of problems
+  # (the dirname of $[0] is not the place where we might find the
+  # original and so on.  Autoconf is especially sensitive to this).
+  . "./$as_me.lineno"
+  # Exit status is that of the last command.
+  exit
+}
+
+# This file is generated from configure.in by Autoconf.  DO NOT EDIT!
+ # Local configure fragment for sysdeps/riscv/elf.
+
+$as_echo "#define PI_STATIC_AND_HIDDEN 1" >>confdefs.h
diff --git a/sysdeps/riscv/configure.in b/sysdeps/riscv/configure.in
new file mode 100644
index 0000000000..34f62d4b4b
--- /dev/null
+++ b/sysdeps/riscv/configure.in
@@ -0,0 +1,4 @@
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/riscv/elf.
+
+AC_DEFINE(PI_STATIC_AND_HIDDEN)
diff --git a/sysdeps/riscv/nptl/Makefile b/sysdeps/riscv/nptl/Makefile
new file mode 100644
index 0000000000..d0c59a5091
--- /dev/null
+++ b/sysdeps/riscv/nptl/Makefile
@@ -0,0 +1,25 @@
+# Copyright (C) 2005 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+#
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, write to the Free
+# Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+# 02111-1307 USA.
+
+ifeq ($(subdir),csu)
+gen-as-const-headers += tcb-offsets.sym
+endif
+
+ifeq ($(subdir),nptl)
+libpthread-sysdep_routines += nptl-sysdep
+endif
diff --git a/sysdeps/riscv/preconfigure b/sysdeps/riscv/preconfigure
new file mode 100644
index 0000000000..43e2a4fac0
--- /dev/null
+++ b/sysdeps/riscv/preconfigure
@@ -0,0 +1,50 @@
+xlen=`$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'`
+
+case "$xlen" in
+32 | 64)
+	;;
+*)
+	echo "Unable to determine XLEN" >&2
+	exit 1
+	;;
+esac
+
+case "$flen" in
+64)
+	float_machine=rvd
+	;;
+32)
+	float_machine=rvf
+	;;
+"")
+	float_machine=
+	;;
+*)
+	echo "Unable to determine FLEN" >&2
+	exit 1
+	;;
+esac
+
+case "$float_abi" in
+soft)
+	abi_flen=0
+	;;
+single)
+	abi_flen=32
+	;;
+double)
+	abi_flen=64
+	;;
+*)
+	echo "Unable to determine floating-point ABI" >&2
+	exit 1
+	;;
+esac
+
+base_machine=riscv
+machine=riscv/rv$xlen/$float_machine
+
+$as_echo "#define RISCV_ABI_XLEN $xlen" >>confdefs.h
+$as_echo "#define RISCV_ABI_FLEN $abi_flen" >>confdefs.h
diff --git a/sysdeps/riscv/rv32/Implies-after b/sysdeps/riscv/rv32/Implies-after
new file mode 100644
index 0000000000..39a34c5f57
--- /dev/null
+++ b/sysdeps/riscv/rv32/Implies-after
@@ -0,0 +1 @@
+wordsize-32
diff --git a/sysdeps/riscv/rv32/rvd/Implies b/sysdeps/riscv/rv32/rvd/Implies
new file mode 100644
index 0000000000..9438838e98
--- /dev/null
+++ b/sysdeps/riscv/rv32/rvd/Implies
@@ -0,0 +1,2 @@
+riscv/rvd
+riscv/rvf
diff --git a/sysdeps/riscv/rv32/rvf/Implies b/sysdeps/riscv/rv32/rvf/Implies
new file mode 100644
index 0000000000..66c401443b
--- /dev/null
+++ b/sysdeps/riscv/rv32/rvf/Implies
@@ -0,0 +1 @@
+riscv/rvf
diff --git a/sysdeps/riscv/rv64/Implies-after b/sysdeps/riscv/rv64/Implies-after
new file mode 100644
index 0000000000..a8cae95f9d
--- /dev/null
+++ b/sysdeps/riscv/rv64/Implies-after
@@ -0,0 +1 @@
+wordsize-64
diff --git a/sysdeps/riscv/rv64/rvd/Implies b/sysdeps/riscv/rv64/rvd/Implies
new file mode 100644
index 0000000000..9438838e98
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvd/Implies
@@ -0,0 +1,2 @@
+riscv/rvd
+riscv/rvf
diff --git a/sysdeps/riscv/rv64/rvf/Implies b/sysdeps/riscv/rv64/rvf/Implies
new file mode 100644
index 0000000000..66c401443b
--- /dev/null
+++ b/sysdeps/riscv/rv64/rvf/Implies
@@ -0,0 +1 @@
+riscv/rvf
diff --git a/sysdeps/riscv/soft-fp/Makefile b/sysdeps/riscv/soft-fp/Makefile
new file mode 100644
index 0000000000..ada13e8b70
--- /dev/null
+++ b/sysdeps/riscv/soft-fp/Makefile
@@ -0,0 +1,3 @@
+ifeq ($(subdir),math)
+CPPFLAGS += -I../soft-fp
+endif
diff --git a/sysdeps/unix/sysv/linux/riscv/Implies b/sysdeps/unix/sysv/linux/riscv/Implies
new file mode 100644
index 0000000000..6faec70115
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/Implies
@@ -0,0 +1 @@
+riscv/nptl
diff --git a/sysdeps/unix/sysv/linux/riscv/Makefile b/sysdeps/unix/sysv/linux/riscv/Makefile
new file mode 100644
index 0000000000..a71840f70c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/Makefile
@@ -0,0 +1,26 @@
+ifeq ($(subdir),elf)
+ifeq ($(build-shared),yes)
+# This is needed for DSO loading from static binaries.
+sysdep-dl-routines += dl-static
+sysdep_routines += dl-static
+sysdep-rtld-routines += dl-static
+endif
+endif
+
+ifeq ($(subdir),stdlib)
+gen-as-const-headers += ucontext_i.sym
+endif
+
+ifeq ($(subdir),crypt)
+libcrypt-sysdep_routines += sysdep
+endif
+
+ifeq ($(subdir),nss)
+libnss_db-sysdep_routines += sysdep
+libnss_db-shared-only-routines += sysdep
+endif
+
+ifeq ($(subdir),rt)
+librt-sysdep_routines += sysdep
+librt-shared-only-routines += sysdep
+endif
diff --git a/sysdeps/unix/sysv/linux/riscv/configure b/sysdeps/unix/sysv/linux/riscv/configure
new file mode 100644
index 0000000000..2bb3062cc3
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/configure
@@ -0,0 +1,7 @@
+# This file is generated from configure.in by Autoconf.  DO NOT EDIT!
+ # Local configure fragment for sysdeps/unix/sysv/linux/riscv.
+
+if test -z "$arch_minimum_kernel"; then
+  arch_minimum_kernel=3.0.0
+  libc_cv_gcc_unwind_find_fde=no
+fi
diff --git a/sysdeps/unix/sysv/linux/riscv/configure.in b/sysdeps/unix/sysv/linux/riscv/configure.in
new file mode 100644
index 0000000000..5b48e1aed6
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/configure.in
@@ -0,0 +1,8 @@
+sinclude(./aclocal.m4)dnl Autoconf lossage
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/unix/sysv/linux/riscv.
+
+if test -z "$arch_minimum_kernel"; then
+  arch_minimum_kernel=3.0.0
+  libc_cv_gcc_unwind_find_fde=no
+fi
diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/Implies b/sysdeps/unix/sysv/linux/riscv/rv32/Implies
new file mode 100644
index 0000000000..8b7deb33cd
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/rv32/Implies
@@ -0,0 +1,3 @@
+unix/sysv/linux/riscv
+unix/sysv/linux/generic/wordsize-32
+unix/sysv/linux/generic
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/Implies b/sysdeps/unix/sysv/linux/riscv/rv64/Implies
new file mode 100644
index 0000000000..f042343bf7
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/Implies
@@ -0,0 +1,3 @@
+unix/sysv/linux/riscv
+unix/sysv/linux/generic
+unix/sysv/linux/wordsize-64
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/Makefile b/sysdeps/unix/sysv/linux/riscv/rv64/Makefile
new file mode 100644
index 0000000000..0a37c5b9b4
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/Makefile
@@ -0,0 +1,9 @@
+ifeq ($(subdir),socket)
+CFLAGS-recv.c += -fexceptions
+CFLAGS-send.c += -fexceptions
+endif
+
+ifeq ($(subdir),nptl)
+CFLAGS-recv.c += -fexceptions
+CFLAGS-send.c += -fexceptions
+endif
diff --git a/sysdeps/unix/sysv/linux/riscv/shlib-versions b/sysdeps/unix/sysv/linux/riscv/shlib-versions
new file mode 100644
index 0000000000..66214b953e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/shlib-versions
@@ -0,0 +1,17 @@
+DEFAULT		GLIBC_2.25
+
+%if RISCV_ABI_XLEN == 64 && RISCV_ABI_FLEN == 64
+ld=ld-linux-riscv64-lp64d.so.1
+%elif RISCV_ABI_XLEN == 64 && RISCV_ABI_FLEN == 32
+ld=ld-linux-riscv64-lp64f.so.1
+%elif RISCV_ABI_XLEN == 64 && RISCV_ABI_FLEN == 0
+ld=ld-linux-riscv64-lp64.so.1
+%elif RISCV_ABI_XLEN == 32 && RISCV_ABI_FLEN == 64
+ld=ld-linux-riscv32-ilp32d.so.1
+%elif RISCV_ABI_XLEN == 32 && RISCV_ABI_FLEN == 32
+ld=ld-linux-riscv32-ilp32f.so.1
+%elif RISCV_ABI_XLEN == 32 && RISCV_ABI_FLEN == 0
+ld=ld-linux-riscv32-ilp32.so.1
+%else
+%error cannot determine ABI
+%endif
-- 
2.13.0