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, 100 insertions, 0 deletions

diff --git a/binutils/readelf.c b/binutils/readelf.c
index 56b80ccc9fb..b13eb6a43ba 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -4205,6 +4205,16 @@ get_v850_section_type_name (unsigned int sh_type)
 }
 
 static const char *
+get_riscv_section_type_name (unsigned int sh_type)
+{
+  switch (sh_type)
+    {
+    case SHT_RISCV_ATTRIBUTES:  return "RISCV_ATTRIBUTES";
+    default: return NULL;
+    }
+}
+
+static const char *
 get_section_type_name (Filedata * filedata, unsigned int sh_type)
 {
   static char buff[32];
@@ -4284,6 +4294,9 @@ get_section_type_name (Filedata * filedata, unsigned int sh_type)
 	    case EM_CYGNUS_V850:
 	      result = get_v850_section_type_name (sh_type);
 	      break;
+	    case EM_RISCV:
+	      result = get_riscv_section_type_name (sh_type);
+	      break;
 	    default:
 	      result = NULL;
 	      break;
@@ -15362,6 +15375,88 @@ display_msp430x_attribute (unsigned char * p,
   return p;
 }
 
+struct riscv_attr_tag_t {
+  const char *name;
+  int tag;
+};
+
+static struct riscv_attr_tag_t riscv_attr_tag[] =
+{
+#define T(tag) {"Tag_RISCV_" #tag, Tag_RISCV_##tag}
+  T(arch),
+  T(priv_spec),
+  T(priv_spec_minor),
+  T(priv_spec_revision),
+  T(unaligned_access),
+  T(stack_align),
+#undef T
+};
+
+static unsigned char *
+display_riscv_attribute (unsigned char *p,
+			 const unsigned char * const end)
+{
+  unsigned int len;
+  int val;
+  int tag;
+  struct riscv_attr_tag_t *attr = NULL;
+  unsigned i;
+
+  tag = read_uleb128 (p, &len, end);
+  p += len;
+
+  /* Find the name of attribute. */
+  for (i = 0; i < ARRAY_SIZE (riscv_attr_tag); i++)
+    {
+      if (riscv_attr_tag[i].tag == tag)
+	{
+	  attr = &riscv_attr_tag[i];
+	  break;
+	}
+    }
+
+  if (attr)
+    printf ("  %s: ", attr->name);
+  else
+    return display_tag_value (tag, p, end);
+
+  switch (tag)
+    {
+    case Tag_RISCV_priv_spec:
+    case Tag_RISCV_priv_spec_minor:
+    case Tag_RISCV_priv_spec_revision:
+      val = read_uleb128 (p, &len, end);
+      p += len;
+      printf (_("%d\n"), val);
+      break;
+    case Tag_RISCV_unaligned_access:
+      val = read_uleb128 (p, &len, end);
+      p += len;
+      switch (val)
+	{
+	case 0:
+	  printf (_("No unaligned access\n"));
+	  break;
+	case 1:
+	  printf (_("Unaligned access\n"));
+	  break;
+	}
+      break;
+    case Tag_RISCV_stack_align:
+      val = read_uleb128 (p, &len, end);
+      p += len;
+      printf (_("%d-bytes\n"), val);
+      break;
+    case Tag_RISCV_arch:
+      p = display_tag_value (-1, p, end);
+      break;
+    default:
+      return display_tag_value (tag, p, end);
+    }
+
+  return p;
+}
+
 static bfd_boolean
 process_attributes (Filedata * filedata,
 		    const char * public_name,
@@ -18896,6 +18991,11 @@ process_arch_specific (Filedata * filedata)
 				display_msp430x_attribute,
 				display_generic_attribute);
 
+    case EM_RISCV:
+     return process_attributes (filedata, "riscv", SHT_RISCV_ATTRIBUTES,
+				display_riscv_attribute,
+				display_generic_attribute);
+
     case EM_NDS32:
       return process_nds32_specific (filedata);