RISC-V: Support ELF attribute for gas and readelf.

	2019-01-16  Kito Cheng  <kito@andestech.com>
		    Nelson Chu  <nelson@andestech.com>

	bfd/
	* elfnn-riscv.c (riscv_elf_obj_attrs_arg_type): New.
	(elf_backend_obj_attrs_vendor): Define.
	(elf_backend_obj_attrs_section_type): Likewise.
	(elf_backend_obj_attrs_section): Likewise.
	(elf_backend_obj_attrs_arg_type): Define as
	riscv_elf_obj_attrs_arg_type.
	* elfxx-riscv.c (riscv_estimate_digit): New.
	(riscv_estimate_arch_strlen1): Likewise.
	(riscv_estimate_arch_strlen): Likewise.
	(riscv_arch_str1): Likewise.
	(riscv_arch_str): Likewise.
	* elfxx-riscv.h (riscv_arch_str): Declare.
	binutils/
	* readelf.c (get_riscv_section_type_name): New function.
	(get_section_type_name): Add handler for RISC-V.
	(riscv_attr_tag_t): Declare.
	(riscv_attr_tag): New.
	(display_riscv_attribute): New function.
	(process_attributes): Add handler for RISC-V.
	* testsuite/binutils-all/strip-3.d: Remove .riscv.attribute
	section.
	gas/
	* config/tc-riscv.c (DEFAULT_RISCV_ATTR): Define to 0 if not defined.
	(riscv_set_options): Add `arch_attr` field.
	(riscv_opts): Set default value for arch_attr.
	(riscv_write_out_arch_attr): New.
	(riscv_set_public_attributes): Likewise.
	(riscv_md_end): Likewise.
	(riscv_convert_symbolic_attribute): Likewise.
	(s_riscv_attribute): Likewise.
	(explicit_arch_attr): Likewise.
	(riscv_pseudo_table): Add .attribute to the table.
	(options): Add OPTION_ARCH_ATTR and OPTION_NO_ARCH_ATTR
	enumeration constants.
	(md_longopts): Add `march-attr' and `mno-arch-attr' options.
	(md_parse_option): Handle the new options.
	(md_show_usage): Document the `march-attr' option.
	* config/tc-riscv.h (md_end): Define as riscv_md_end
	(riscv_md_end): Declare.
	(CONVERT_SYMBOLIC_ATTRIBUTE): Define as
	riscv_convert_symbolic_attribute.
	(riscv_convert_symbolic_attribute): Declare.
	(start_assemble): Declare.
	* testsuite/gas/elf/elf.exp: Adjust test case for section2.e.
	* testsuite/gas/elf/section2.e-riscv: New.
	* testsuite/gas/riscv/attribute-01.d: New test
	* testsuite/gas/riscv/attribute-02.d: Likewise.
	* testsuite/gas/riscv/attribute-03.d: Likewise.
	* testsuite/gas/riscv/attribute-04.d: Likewise.
	* testsuite/gas/riscv/attribute-04.s: Likewise.
	* testsuite/gas/riscv/attribute-05.d: Likewise.
	* testsuite/gas/riscv/attribute-05.s: Likewise.
	* testsuite/gas/riscv/attribute-06.d: Likewise.
	* testsuite/gas/riscv/attribute-06.s: Likewise.
	* testsuite/gas/riscv/attribute-07.d: Likewise.
	* testsuite/gas/riscv/attribute-07.s: Likewise.
	* testsuite/gas/riscv/attribute-08.d: Likewise.
	* testsuite/gas/riscv/attribute-08.s: Likewise.
	* testsuite/gas/riscv/attribute-unknown.d: Likewise.
	* testsuite/gas/riscv/attribute-unknown.s: Likewise.
	* testsuite/gas/riscv/empty.l: Likewise.
	* doc/c-riscv.texi (.attribute): Add documentation.
	* configure.ac (--enable-default-riscv-attribute): New options.
	* configure: Re-generate.
	* config.in: Re-generate.
	include/
	* elf/riscv.h (SHT_RISCV_ATTRIBUTES): Define.
	(Tag_RISCV_arch): Likewise.
	(Tag_RISCV_priv_spec): Likewise.
	(Tag_RISCV_priv_spec_minor): Likewise.
	(Tag_RISCV_priv_spec_revision): Likewise.
	(Tag_RISCV_unaligned_access): Likewise.
	(Tag_RISCV_stack_align): Likewise.

1 files changed, 32 insertions, 2 deletions

diff --git a/gas/configure b/gas/configure
index ea85e1b..64de9f1 100755
--- a/gas/configure
+++ b/gas/configure
@@ -809,6 +809,7 @@ enable_x86_relax_relocations
 enable_elf_stt_common
 enable_generate_build_notes
 enable_x86_used_note
+enable_default_riscv_attribute
 enable_werror
 enable_build_warnings
 with_cpu
@@ -1471,6 +1472,8 @@ Optional Features:
                           generate GNU Build notes if none are provided by the
                           input
   --enable-x86-used-note  generate GNU x86 used ISA and feature properties
+  --enable-default-riscv-attribute
+                          generate RISC-V arch attribute by default
   --enable-werror         treat compile warnings as errors
   --enable-build-warnings enable build-time compiler warnings
   --disable-nls           do not use Native Language Support
@@ -11337,7 +11340,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11340 "configure"
+#line 11343 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11443,7 +11446,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11446 "configure"
+#line 11449 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12125,6 +12128,16 @@ if test "${enable_x86_used_note+set}" = set; then :
 esac
 fi
 
+# Decide if the RISC-V ELF assembler should default to generating attribute.
+ac_default_generate_riscv_attr=unset
+# Provide a configuration option to override the default.
+# Check whether --enable-default-riscv-attribute was given.
+if test "${enable_default_riscv_attribute+set}" = set; then :
+  enableval=$enable_default_riscv_attribute; case "${enableval}" in
+  yes)  ac_default_generate_riscv_attr=1 ;;
+  no)   ac_default_generate_riscv_attr=0 ;;
+esac
+fi
 
 using_cgen=no
 
@@ -13102,6 +13115,23 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+if test ${ac_default_generate_riscv_attr} = unset; then
+    case ${target_os} in
+      elf)
+	ac_default_generate_riscv_attr=1
+	;;
+      *)
+	ac_default_generate_riscv_attr=0
+	;;
+  esac
+fi
+
+
+cat >>confdefs.h <<_ACEOF
+#define DEFAULT_RISCV_ATTR $ac_default_generate_riscv_attr
+_ACEOF
+
+
 if test x$ac_default_compressed_debug_sections = xyes ; then
 
 $as_echo "#define DEFAULT_FLAG_COMPRESS_DEBUG 1" >>confdefs.h