Allow stubs without associated input section in ARM backend

2016-05-10  Thomas Preud'homme  <thomas.preudhomme@arm.com>

bfd/
	* bfd-in.h (elf32_arm_size_stubs): Add an output section parameter.
	* bfd-in2.h: Regenerated.
	* elf32-arm.c (struct elf32_arm_link_hash_table): Add an output section
	parameter to add_stub_section callback.
	(elf32_arm_create_or_find_stub_sec): Get output section from link_sec
	and pass it down to add_stub_section.
	(elf32_arm_add_stub): Set section to stub_sec if NULL before using it
	for error message.
	(elf32_arm_size_stubs): Add output section parameter to
	add_stub_section function pointer parameter.

ld/
	* emultempl/armelf.em (elf32_arm_add_stub_section): Add output_section
	parameter and rename input_section parameter to after_input_section.
	Append input stub section to the output section if after_input_section
	is NULL.

2 files changed, 29 insertions, 6 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 752f766..e7a4316 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,5 +1,12 @@
 2016-05-10  Thomas Preud'homme  <thomas.preudhomme@arm.com>
 
+	* emultempl/armelf.em (elf32_arm_add_stub_section): Add output_section
+	parameter and rename input_section parameter to after_input_section.
+	Append input stub section to the output section if after_input_section
+	is NULL.
+
+2016-05-10  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
 	* testsuite/ld-arm/arm-elf.exp (EABI attribute merging 10 (DSP)): New
 	test.
 	* testsuite/ld-arm/attr-merge-10b-dsp.s: New file.
diff --git a/ld/emultempl/armelf.em b/ld/emultempl/armelf.em
index 2e43172..bfb7ee4 100644
--- a/ld/emultempl/armelf.em
+++ b/ld/emultempl/armelf.em
@@ -203,12 +203,12 @@ hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
 
 static asection *
 elf32_arm_add_stub_section (const char * stub_sec_name,
-			    asection *   input_section,
+			    asection *   output_section,
+			    asection *   after_input_section,
 			    unsigned int alignment_power)
 {
   asection *stub_sec;
   flagword flags;
-  asection *output_section;
   lang_output_section_statement_type *os;
   struct hook_stub_info info;
 
@@ -221,18 +221,34 @@ elf32_arm_add_stub_section (const char * stub_sec_name,
 
   bfd_set_section_alignment (stub_file->the_bfd, stub_sec, alignment_power);
 
-  output_section = input_section->output_section;
   os = lang_output_section_get (output_section);
 
-  info.input_section = input_section;
+  info.input_section = after_input_section;
   lang_list_init (&info.add);
   lang_add_section (&info.add, stub_sec, NULL, os);
 
   if (info.add.head == NULL)
     goto err_ret;
 
-  if (hook_in_stub (&info, &os->children.head))
-    return stub_sec;
+  if (after_input_section == NULL)
+    {
+      lang_statement_union_type **lp = &os->children.head;
+      lang_statement_union_type *l, *lprev = NULL;
+
+      for (; (l = *lp) != NULL; lp = &l->header.next, lprev = l);
+
+      if (lprev)
+	lprev->header.next = info.add.head;
+      else
+	os->children.head = info.add.head;
+
+      return stub_sec;
+    }
+  else
+    {
+      if (hook_in_stub (&info, &os->children.head))
+	return stub_sec;
+    }
 
  err_ret:
   einfo ("%X%P: can not make stub section: %E\n");