Add support for RISC-V architecture.

bfd	* Makefile.am: Add entries for riscv32-elf and riscv64-elf.
	* config.bdf: Likewise.
	* configure.ac: Likewise.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* archures.c: Add bfd_riscv_arch.
	* reloc.c: Add riscv relocs.
	* targets.c: Add riscv_elf32_vec and riscv_elf64_vec.
	* bfd-in2.h: Regenerate.
	* libbfd.h: Regenerate.
	* elf-bfd.h: Add RISCV_ELF_DATA to enum elf_target_id.
	* elfnn-riscv.c: New file.
	* elfxx-riscv.c: New file.
	* elfxx-riscv.h: New file.

binutils* readelf.c (guess_is_rela): Add EM_RISCV.
	(get_machine_name): Likewise.
	(dump_relocations): Add support for riscv relocations.
	(get_machine_flags): Add support for riscv flags.
	(is_32bit_abs_reloc): Add R_RISCV_32.
	(is_64bit_abs_reloc): Add R_RISCV_64.
	(is_none_reloc): Add R_RISCV_NONE.
	* testsuite/binutils-all/objdump.exp (cpus_expected): Add riscv.
	Expect the debug_ranges test to fail.

gas	* Makefile.am: Add riscv files.
	* Makefile.in: Regenerate.
	* NEWS: Mention the support for this architecture.
	* configure.in: Define a default architecture.
	* configure: Regenerate.
	* configure.tgt: Add entries for riscv.
	* doc/as.texinfo: Likewise.
	* testsuite/gas/all/gas.exp: Expect the redef tests to fail.
	* testsuite/gas/elf/elf.exp: Expect the groupauto tests to fail.
	* config/tc-riscv.c: New file.
	* config/tc-riscv.h: New file.
	* doc/c-riscv.texi: New file.
	* testsuite/gas/riscv: New directory.
	* testsuite/gas/riscv/riscv.exp: New file.
	* testsuite/gas/riscv/t_insns.d: New file.
	* testsuite/gas/riscv/t_insns.s: New file.

ld	* Makefile.am: Add riscv files.
	* Makefile.in: Regenerate.
	* NEWS: Mention the support for this target.
	* configure.tgt: Add riscv entries.
	* emulparams/elf32lriscv-defs.sh: New file.
	* emulparams/elf32lriscv.sh: New file.
	* emulparams/elf64lriscv-defs.sh: New file.
	* emulparams/elf64lriscv.sh: New file.
	* emultempl/riscvelf.em: New file.

opcodes	* configure.ac: Add entry for bfd_riscv_arch.
	* configure: Regenerate.
	* disassemble.c (disassembler): Add support for riscv.
	(disassembler_usage): Likewise.
	* riscv-dis.c: New file.
	* riscv-opc.c: New file.

include	* dis-asm.h: Add prototypes for print_insn_riscv and
	print_riscv_disassembler_options.
	* elf/riscv.h: New file.
	* opcode/riscv-opc.h: New file.
	* opcode/riscv.h: New file.

5 files changed, 42 insertions, 4 deletions

diff --git a/gas/testsuite/gas/all/gas.exp b/gas/testsuite/gas/all/gas.exp
index bfb13ed..eb225fc 100644
--- a/gas/testsuite/gas/all/gas.exp
+++ b/gas/testsuite/gas/all/gas.exp
@@ -159,10 +159,10 @@ case $target_triplet in {
 	# These targets fail redef2 because they disallow redefined
 	# symbols on relocs.
 	setup_xfail "m68hc1*-*-*" "m6811-*-*" "m6812-*-*" "rl78-*-*"
-	setup_xfail "rx-*-*" "vax*-*-*" "xgate*-*-*" "z8k-*-*"
+	setup_xfail "riscv*-*-*" "rx-*-*" "vax*-*-*" "xgate*-*-*" "z8k-*-*"
 	run_dump_test redef2
 	setup_xfail "m68hc1*-*-*" "m6811-*-*" "m6812-*-*" "rl78-*-*"
-	setup_xfail "rx-*-*" "vax*-*-*" "xgate*-*-*" "z8k-*-*"
+	setup_xfail "riscv*-*-*" "rx-*-*" "vax*-*-*" "xgate*-*-*" "z8k-*-*"
 	# rs6000-aix disallows redefinition via .comm.
 	setup_xfail "*-*-aix*"
 	# SOM uses a different syntax for .comm
@@ -277,8 +277,8 @@ if {    ![istarget *c30*-*-*]
      && ![istarget hppa*-*-*] } then {
     # The vax fails because VMS can apparently actually handle this
     # case in relocs, so gas doesn't handle it itself.
-    # msp430 and mn10[23]00 emit two relocs to handle the difference of two symbols.
-    setup_xfail "mn10200-*-*" "mn10300*-*-*" "msp430*-*-*" "vax*-*-vms*"
+    # msp430, mn10[23]00 and riscv emit two relocs to handle the difference of two symbols.
+    setup_xfail "mn10200-*-*" "mn10300*-*-*" "msp430*-*-*" "riscv*-*-*" "vax*-*-vms*"
     do_930509a
 }
 
diff --git a/gas/testsuite/gas/elf/elf.exp b/gas/testsuite/gas/elf/elf.exp
index d57665e..df9f4ba 100644
--- a/gas/testsuite/gas/elf/elf.exp
+++ b/gas/testsuite/gas/elf/elf.exp
@@ -120,12 +120,14 @@ if { [is_elf_format] } then {
     run_dump_test "group2"
     case $target_triplet in {
 	{ hppa64*-*-hpux* } { }
+	{ riscv*-*-* } { }
 	default {
 	    run_dump_test "groupautoa"
 	}
     }
     case $target_triplet in {
 	{ hppa64*-*-hpux* } { }
+	{ riscv*-*-* } { }
 	{ xtensa*-*-* } { }
 	default {
 	    run_dump_test "groupautob"
@@ -144,6 +146,7 @@ if { [is_elf_format] } then {
 	{ mn10300-*-* } { }
 	{ msp43*-*-* } { }
 	{ rl78-*-* } { }
+	{ riscv*-*-* } { }
 	{ rx-*-* } { }
 	default {
 	    # The next test can fail if the target does not convert fixups
diff --git a/gas/testsuite/gas/riscv/riscv.exp b/gas/testsuite/gas/riscv/riscv.exp
new file mode 100644
index 0000000..27d73cd
--- /dev/null
+++ b/gas/testsuite/gas/riscv/riscv.exp
@@ -0,0 +1,23 @@
+# Expect script for RISC-V assembler tests.
+#   Copyright (C) 2011-2016 Free Software Foundation, Inc.
+#
+# This file is part of the GNU Binutils.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+# MA 02110-1301, USA.
+
+if [istarget riscv*-*-*] {
+    run_dump_test "t_insns"
+}
diff --git a/gas/testsuite/gas/riscv/t_insns.d b/gas/testsuite/gas/riscv/t_insns.d
new file mode 100644
index 0000000..720f0db
--- /dev/null
+++ b/gas/testsuite/gas/riscv/t_insns.d
@@ -0,0 +1,10 @@
+#as:
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ 	]+0:[ 	]+00000013[ 	]+nop
diff --git a/gas/testsuite/gas/riscv/t_insns.s b/gas/testsuite/gas/riscv/t_insns.s
new file mode 100644
index 0000000..9945688
--- /dev/null
+++ b/gas/testsuite/gas/riscv/t_insns.s
@@ -0,0 +1,2 @@
+target:
+	nop