Enhance GAS's .section directive so that it can take numeric values for the flags and type fields. (ELF only)

gas	* doc/as.texinfo (.section): Document that numeric values can now
	be used for the flags and type fields of the ELF target's .section
	directive.  Add notes about the restrictions on setting flags and
	types.
	* config/obj-elf.c (obj_elf_change_section): Allow known sections
	to be given processor specific section types.  Allow processor and
	application specific flags of a section to be set after
	definition.
	(obj_elf_parse_section_letters): Handle parsing numeric values.
	(obj_elf_section_type): Handle parsing numeric values.
	(obj_elf_section): Allow numeric type values.
	* config/obj-elf.h (obj_elf_change_section): Update prototype.
	* testsuite/gas/elf/section10.d: New test.
	* testsuite/gas/elf/section10.s: Source file for new test.
	* testsuite/gas/elf/elf.exp: Run the new test.
	* testsuite/gas/i386/ilp32/x86-64-unwind.d: Remove dependency upon
	the description of the flags produced by readelf.
	* testsuite/gas/tic6x/scomm-directive-4.d: Likewise.
	* NEWS: Mention the new feature.

bfd	* elf-bfd.h (struct bfd_elf_special_section): Use unsigned values
	for length and type fields.  Use a signed value for the
	suffix_length field.

binutils* readelf.c (get_section_type_name): Add hex prefix to offsets
	printed for LOPROC and LOOS values.  Ensure that a result is
	always returned for the V850 target, even when an unrecognised
	processor specific value is encountered.
	(process_section_headers): Display key values in the order in
	which they appear to the user.  Add the "C (compressed)" value to
	the list.

ld	* testsuite/ld-i386/pr12718.d: Remove dependency upon the
	description of the flags produced by readelf.
	* testsuite/ld-i386/pr12921.d: Likewise.
	* testsuite/ld-i386/tlsbin-nacl.rd: Likewise.
	* testsuite/ld-i386/tlsbin.rd: Likewise.
	* testsuite/ld-i386/tlsbindesc-nacl.rd: Likewise.
	* testsuite/ld-i386/tlsbindesc.rd: Likewise.
	* testsuite/ld-i386/tlsdesc-nacl.rd: Likewise.
	* testsuite/ld-i386/tlsdesc.rd: Likewise.
	* testsuite/ld-i386/tlsgdesc-nacl.rd: Likewise.
	* testsuite/ld-i386/tlsgdesc.rd: Likewise.
	* testsuite/ld-i386/tlsnopic-nacl.rd: Likewise.
	* testsuite/ld-i386/tlsnopic.rd: Likewise.
	* testsuite/ld-i386/tlspic-nacl.rd: Likewise.
	* testsuite/ld-i386/tlspic.rd: Likewise.
	* testsuite/ld-s390/tlsbin.rd: Likewise.
	* testsuite/ld-s390/tlsbin_64.rd: Likewise.
	* testsuite/ld-s390/tlspic.rd: Likewise.
	* testsuite/ld-s390/tlspic_64.rd: Likewise.
	* testsuite/ld-sh/tlsbin-2.d: Likewise.
	* testsuite/ld-sh/tlspic-2.d: Likewise.
	* testsuite/ld-tic6x/common.d: Likewise.
	* testsuite/ld-tic6x/shlib-1.rd: Likewise.
	* testsuite/ld-tic6x/shlib-1b.rd: Likewise.
	* testsuite/ld-tic6x/shlib-1r.rd: Likewise.
	* testsuite/ld-tic6x/shlib-1rb.rd: Likewise.
	* testsuite/ld-tic6x/shlib-app-1.rd: Likewise.
	* testsuite/ld-tic6x/shlib-app-1b.rd: Likewise.
	* testsuite/ld-tic6x/shlib-app-1r.rd: Likewise.
	* testsuite/ld-tic6x/shlib-app-1rb.rd: Likewise.
	* testsuite/ld-tic6x/shlib-noindex.rd: Likewise.
	* testsuite/ld-tic6x/static-app-1.rd: Likewise.
	* testsuite/ld-tic6x/static-app-1b.rd: Likewise.
	* testsuite/ld-tic6x/static-app-1r.rd: Likewise.
	* testsuite/ld-tic6x/static-app-1rb.rd: Likewise.
	* testsuite/ld-x86-64/ilp32-4-nacl.d: Likewise.
	* testsuite/ld-x86-64/ilp32-4.d: Likewise.
	* testsuite/ld-x86-64/pr12718.d: Likewise.
	* testsuite/ld-x86-64/pr12921.d: Likewise.
	* testsuite/ld-x86-64/split-by-file-nacl.rd: Likewise.
	* testsuite/ld-x86-64/split-by-file.rd: Likewise.
	* testsuite/ld-x86-64/tlsbin-nacl.rd: Likewise.
	* testsuite/ld-x86-64/tlsbin.rd: Likewise.
	* testsuite/ld-x86-64/tlsbindesc-nacl.rd: Likewise.
	* testsuite/ld-x86-64/tlsbindesc.rd: Likewise.
	* testsuite/ld-x86-64/tlsdesc-nacl.rd: Likewise.
	* testsuite/ld-x86-64/tlsdesc.rd: Likewise.
	* testsuite/ld-x86-64/tlsgdesc-nacl.rd: Likewise.
	* testsuite/ld-x86-64/tlsgdesc.rd: Likewise.
	* testsuite/ld-x86-64/tlspic-nacl.rd: Likewise.
	* testsuite/ld-x86-64/tlspic.rd: Likewise.
	* testsuite/ld-xtensa/tlsbin.rd: Likewise.
	* testsuite/ld-xtensa/tlspic.rd: Likewise.

2 files changed, 49 insertions, 9 deletions

diff --git a/gas/config/obj-elf.c b/gas/config/obj-elf.c
index f4726ff..9af349c 100644
--- a/gas/config/obj-elf.c
+++ b/gas/config/obj-elf.c
@@ -547,7 +547,7 @@ get_section (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf)
 
 void
 obj_elf_change_section (const char *name,
-			int type,
+			unsigned int type,
 			bfd_vma attr,
 			int entsize,
 			const char *group_name,
@@ -621,7 +621,9 @@ obj_elf_change_section (const char *name,
 	      && ssect->type != SHT_PREINIT_ARRAY)
 	    {
 	      /* We allow to specify any type for a .note section.  */
-	      if (ssect->type != SHT_NOTE)
+	      if (ssect->type != SHT_NOTE
+		  /* Processor and application defined types are allowed too.  */
+		  && type < SHT_LOPROC)
 		as_warn (_("setting incorrect section type for %s"),
 			 name);
 	    }
@@ -633,7 +635,8 @@ obj_elf_change_section (const char *name,
 	    }
 	}
 
-      if (old_sec == NULL && (attr & ~ssect->attr) != 0)
+      if (old_sec == NULL && ((attr & ~(SHF_MASKOS | SHF_MASKPROC))
+			      & ~ssect->attr) != 0)
 	{
 	  /* As a GNU extension, we permit a .note section to be
 	     allocatable.  If the linker sees an allocatable .note
@@ -682,6 +685,7 @@ obj_elf_change_section (const char *name,
 	      override = TRUE;
 	    }
 	}
+
       if (!override && old_sec == NULL)
 	attr |= ssect->attr;
     }
@@ -745,6 +749,11 @@ obj_elf_change_section (const char *name,
 		  | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
 		  | SEC_THREAD_LOCAL)))
 	    as_warn (_("ignoring changed section attributes for %s"), name);
+	  else
+	    /* FIXME: Maybe we should consider removing a previously set
+	       processor or application specific attribute as suspicious ?  */
+	    elf_section_flags (sec) = attr;
+
 	  if ((flags & SEC_MERGE) && old_sec->entsize != (unsigned) entsize)
 	    as_warn (_("ignoring changed section entity size for %s"), name);
 	}
@@ -806,14 +815,26 @@ obj_elf_parse_section_letters (char *str, size_t len, bfd_boolean *is_clone)
 	    }
 	default:
 	  {
-	    char *bad_msg = _("unrecognized .section attribute: want a,e,w,x,M,S,G,T");
+	    char *bad_msg = _("unrecognized .section attribute: want a,e,w,x,M,S,G,T or number");
 #ifdef md_elf_section_letter
 	    bfd_vma md_attr = md_elf_section_letter (*str, &bad_msg);
 	    if (md_attr != (bfd_vma) -1)
 	      attr |= md_attr;
 	    else
 #endif
-	      as_fatal ("%s", bad_msg);
+	      if (ISDIGIT (*str))
+		{
+		  char * end;
+
+		  attr |= strtoul (str, & end, 0);
+		  /* Update str and len, allowing for the fact that
+		     we will execute str++ and len-- below.  */
+		  end --;
+		  len -= (end - str);
+		  str = end;
+		}
+	      else
+		as_fatal ("%s", bad_msg);
 	  }
 	  break;
 	}
@@ -847,6 +868,17 @@ obj_elf_section_type (char *str, size_t len, bfd_boolean warn)
   }
 #endif
 
+  if (ISDIGIT (*str))
+    {
+      char * end;
+      int type = strtoul (str, & end, 0);
+
+      if (warn && (size_t) (end - str) != len)
+	as_warn (_("extraneous characters at end of numeric section type"));
+
+      return type;
+    }
+
   if (warn)
     as_warn (_("unrecognized section type"));
   return 0;
@@ -1046,9 +1078,17 @@ obj_elf_section (int push)
 	      else if (c == '@' || c == '%')
 		{
 		  ++input_line_pointer;
-		  c = get_symbol_name (& beg);
-		  (void) restore_line_pointer (c);
-		  type = obj_elf_section_type (beg, input_line_pointer - beg, TRUE);
+
+		  if (ISDIGIT (* input_line_pointer))
+		    {
+		      type = strtoul (input_line_pointer, & input_line_pointer, 0);
+		    }
+		  else
+		    {
+		      c = get_symbol_name (& beg);
+		      (void) restore_line_pointer (c);
+		      type = obj_elf_section_type (beg, input_line_pointer - beg, TRUE);
+		    }
 		}
 	      else
 		input_line_pointer = save;
diff --git a/gas/config/obj-elf.h b/gas/config/obj-elf.h
index f3424a5..257d877 100644
--- a/gas/config/obj-elf.h
+++ b/gas/config/obj-elf.h
@@ -162,7 +162,7 @@ extern void obj_elf_common (int);
 extern void obj_elf_data (int);
 extern void obj_elf_text (int);
 extern void obj_elf_change_section
-  (const char *, int, bfd_vma, int, const char *, int, int);
+  (const char *, unsigned int, bfd_vma, int, const char *, int, int);
 extern struct fix *obj_elf_vtable_inherit (int);
 extern struct fix *obj_elf_vtable_entry (int);
 extern bfd_boolean obj_elf_seen_attribute