* ldgram.y (sect_constraint): New.

(ONLY_IF_RO, ONLY_IF_RW): New tokens.
	(section): Add sect_constraint.  Pass additional argument
	to lang_enter_output_section_statement.
	* mri.c (mri_draw_tree): Pass additional argument to
	lang_enter_output_section_statement.
	* emultempl/pe.em (place_orphan): Likewise.
	(output_prev_sec_find): Disregard output section statements with
	constraint == -1.
	* emultempl/mmo.em (output_prev_sec_find): Likewise.
	(mmo_place_orphan): Pass additional argument to
	lang_enter_output_section_statement.
	* emultempl/elf32.em (output_prev_sec_find): Disregard output section
	statements with constraint == -1.
	(place_orphan): Pass additional argument to
	lang_enter_output_section_statement.
	* ldlang.c (lang_enter_overlay_section): Likewise.
	(lang_output_section_find_1): New.
	(lang_output_section_find): Use it.
	(lang_output_section_statement_lookup_1): New.
	(lang_output_section_statement_lookup): Use it.
	(check_section_callback, check_input_sections): New.
	(map_input_to_output_sections): Check if all input sections
	are readonly if ONLY_IF_RO or ONLY_IF_RW was seen.
	(strip_excluded_output_sections): Disregard output section statements
	with constraint == -1.
	(lang_record_phdrs): Likewise.
	(lang_enter_output_section_statement): Add constraint argument.
	Use lang_output_section_statement_lookup_1.
	* ldlang.h (lang_output_section_statement_type): Add constraint
	and all_input_readonly fields.
	(lang_enter_output_section_statement): Adjust prototype.
	* ldlex.l (ONLY_IF_RO, ONLY_IF_RW): New tokens.
	* scripttempl/elf.sc (.eh_frame, .gcc_except_table): Move into text
	segment if all input sections are readonly.

ld/ldlang.c

@@ -598,8 +598,8 @@ lang_memory_default (asection *section)
   return lang_memory_region_lookup (DEFAULT_MEMORY_REGION, FALSE);
 }
 
-lang_output_section_statement_type *
-lang_output_section_find (const char *const name)
+static lang_output_section_statement_type *
+lang_output_section_find_1 (const char *const name, int constraint)
 {
   lang_statement_union_type *u;
   lang_output_section_statement_type *lookup;
@@ -607,18 +607,26 @@ lang_output_section_find (const char *const name)
   for (u = lang_output_section_statement.head; u != NULL; u = lookup->next)
     {
       lookup = &u->output_section_statement;
-      if (strcmp (name, lookup->name) == 0)
+      if (strcmp (name, lookup->name) == 0
+	  && lookup->constraint != -1
+	  && (constraint == 0 || constraint == lookup->constraint))
 	return lookup;
     }
   return NULL;
 }
 
 lang_output_section_statement_type *
-lang_output_section_statement_lookup (const char *const name)
+lang_output_section_find (const char *const name)
+{
+  return lang_output_section_find_1 (name, 0);
+}
+
+static lang_output_section_statement_type *
+lang_output_section_statement_lookup_1 (const char *const name, int constraint)
 {
   lang_output_section_statement_type *lookup;
 
-  lookup = lang_output_section_find (name);
+  lookup = lang_output_section_find_1 (name, constraint);
   if (lookup == NULL)
     {
       lookup = new_stat (lang_output_section_statement, stat_ptr);
@@ -631,6 +639,7 @@ lang_output_section_statement_lookup (const char *const name)
       lookup->next = NULL;
       lookup->bfd_section = NULL;
       lookup->processed = 0;
+      lookup->constraint = constraint;
       lookup->sectype = normal_section;
       lookup->addr_tree = NULL;
       lang_list_init (&lookup->children);
@@ -650,6 +659,12 @@ lang_output_section_statement_lookup (const char *const name)
   return lookup;
 }
 
+lang_output_section_statement_type *
+lang_output_section_statement_lookup (const char *const name)
+{
+  return lang_output_section_statement_lookup_1 (name, 0);
+}
+
 static void
 lang_map_flags (flagword flag)
 {
@@ -1315,6 +1330,30 @@ output_section_callback (lang_wild_statement_type *ptr,
     }
 }
 
+/* Check if all sections in a wild statement for a particular FILE
+   are readonly.  */
+
+static void
+check_section_callback (lang_wild_statement_type *ptr ATTRIBUTE_UNUSED,
+			struct wildcard_list *sec ATTRIBUTE_UNUSED,
+			asection *section,
+			lang_input_statement_type *file ATTRIBUTE_UNUSED,
+			void *output)
+{
+  /* Exclude sections that match UNIQUE_SECTION_LIST.  */
+  if (unique_section_p (section))
+    return;
+
+  if (section->output_section == NULL)
+    {
+      flagword flags = bfd_get_section_flags (section->owner, section);
+
+      if ((flags & SEC_READONLY) == 0)
+	((lang_output_section_statement_type *) output)->all_input_readonly
+	  = FALSE;
+    }
+}
+
 /* This is passed a file name which must have been seen already and
    added to the statement tree.  We will see if it has been opened
    already and had its symbols read.  If not then we'll read it.  */
@@ -2068,6 +2107,40 @@ lang_place_undefineds (void)
     insert_undefined (ptr->name);
 }
 
+/* Check for all readonly or some readwrite sections.  */
+
+static void
+check_input_sections (lang_statement_union_type *s,
+		      lang_output_section_statement_type *output_section_statement)
+{
+  for (; s != (lang_statement_union_type *) NULL; s = s->header.next)
+    {
+      switch (s->header.type)
+      {
+      case lang_wild_statement_enum:
+	walk_wild (&s->wild_statement, check_section_callback,
+		   output_section_statement);
+	if (! output_section_statement->all_input_readonly)
+	  return;
+	break;
+      case lang_constructors_statement_enum:
+	check_input_sections (constructor_list.head,
+			      output_section_statement);
+	if (! output_section_statement->all_input_readonly)
+	  return;
+	break;
+      case lang_group_statement_enum:
+	check_input_sections (s->group_statement.children.head,
+			      output_section_statement);
+	if (! output_section_statement->all_input_readonly)
+	  return;
+	break;
+      default:
+	break;
+      }
+    }
+}
+
 /* Open input files and attach to output sections.  */
 
 static void
@@ -2088,6 +2161,23 @@ map_input_to_output_sections
 					output_section_statement);
 	  break;
 	case lang_output_section_statement_enum:
+	  if (s->output_section_statement.constraint)
+	    {
+	      if (s->output_section_statement.constraint == -1)
+		break;
+	      s->output_section_statement.all_input_readonly = TRUE;
+	      check_input_sections (s->output_section_statement.children.head,
+				    &s->output_section_statement);
+	      if ((s->output_section_statement.all_input_readonly
+		   && s->output_section_statement.constraint == ONLY_IF_RW)
+		  || (!s->output_section_statement.all_input_readonly
+		      && s->output_section_statement.constraint == ONLY_IF_RO))
+		{
+		  s->output_section_statement.constraint = -1;
+		  break;
+		}
+	    }
+
 	  map_input_to_output_sections (s->output_section_statement.children.head,
 					target,
 					&s->output_section_statement);
@@ -2162,6 +2252,8 @@ strip_excluded_output_sections (void)
       asection *s;
 
       os = &u->output_section_statement;
+      if (os->constraint == -1)
+	continue;
       s = os->bfd_section;
       if (s != NULL && (s->flags & SEC_EXCLUDE) != 0)
 	{
@@ -4029,13 +4121,15 @@ lang_enter_output_section_statement (const char *output_section_statement_name,
 				     enum section_type sectype,
 				     etree_type *align,
 				     etree_type *subalign,
-				     etree_type *ebase)
+				     etree_type *ebase,
+				     int constraint)
 {
   lang_output_section_statement_type *os;
 
   current_section =
    os =
-    lang_output_section_statement_lookup (output_section_statement_name);
+    lang_output_section_statement_lookup_1 (output_section_statement_name,
+					    constraint);
 
   /* Add this statement to tree.  */
 #if 0
@@ -4737,6 +4831,8 @@ lang_record_phdrs (void)
 	  lang_output_section_phdr_list *pl;
 
 	  os = &u->output_section_statement;
+	  if (os->constraint == -1)
+	    continue;
 
 	  pl = os->phdrs;
 	  if (pl != NULL)
@@ -4796,7 +4892,8 @@ lang_record_phdrs (void)
     {
       lang_output_section_phdr_list *pl;
 
-      if (u->output_section_statement.bfd_section == NULL)
+      if (u->output_section_statement.constraint == -1
+	  || u->output_section_statement.bfd_section == NULL)
 	continue;
 
       for (pl = u->output_section_statement.phdrs;
@@ -4868,7 +4965,7 @@ lang_enter_overlay_section (const char *name)
   etree_type *size;
 
   lang_enter_output_section_statement (name, overlay_vma, normal_section,
-				       0, overlay_subalign, 0);
+				       0, overlay_subalign, 0, 0);
 
   /* If this is the first section, then base the VMA of future
      sections on this one.  This will work correctly even if `.' is