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.

bfd/ChangeLog

@@ -1,3 +1,16 @@
+2016-05-10  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* 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.
+
 2016-05-10  Thomas Preud'homme  <thomas.preudhomme@arm.com>
 
 	* elf32-arm.c (elf32_arm_create_stub): New function.

bfd/bfd-in.h

@@ -934,7 +934,8 @@ extern void elf32_arm_next_input_section
   (struct bfd_link_info *, struct bfd_section *);
 extern bfd_boolean elf32_arm_size_stubs
   (bfd *, bfd *, struct bfd_link_info *, bfd_signed_vma,
-   struct bfd_section * (*) (const char *, struct bfd_section *, unsigned int),
+   struct bfd_section * (*) (const char *, struct bfd_section *,
+			     struct bfd_section *, unsigned int),
    void (*) (void));
 extern bfd_boolean elf32_arm_build_stubs
   (struct bfd_link_info *);

bfd/bfd-in2.h

@@ -941,7 +941,8 @@ extern void elf32_arm_next_input_section
   (struct bfd_link_info *, struct bfd_section *);
 extern bfd_boolean elf32_arm_size_stubs
   (bfd *, bfd *, struct bfd_link_info *, bfd_signed_vma,
-   struct bfd_section * (*) (const char *, struct bfd_section *, unsigned int),
+   struct bfd_section * (*) (const char *, struct bfd_section *,
+			     struct bfd_section *, unsigned int),
    void (*) (void));
 extern bfd_boolean elf32_arm_build_stubs
   (struct bfd_link_info *);

bfd/elf32-arm.c

@@ -3163,7 +3163,8 @@ struct elf32_arm_link_hash_table
   bfd *stub_bfd;
 
   /* Linker call-backs.  */
-  asection * (*add_stub_section) (const char *, asection *, unsigned int);
+  asection * (*add_stub_section) (const char *, asection *, asection *,
+				  unsigned int);
   void (*layout_sections_again) (void);
 
   /* Array to keep track of which stub sections have been created, and
@@ -4144,6 +4145,7 @@ elf32_arm_create_or_find_stub_sec (asection **link_sec_p, asection *section,
 {
   asection *link_sec;
   asection *stub_sec;
+  asection *out_sec;
 
   link_sec = htab->stub_group[section->id].link_sec;
   BFD_ASSERT (link_sec != NULL);
@@ -4166,7 +4168,8 @@ elf32_arm_create_or_find_stub_sec (asection **link_sec_p, asection *section,
 
 	  memcpy (s_name, link_sec->name, namelen);
 	  memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX));
-	  stub_sec = (*htab->add_stub_section) (s_name, link_sec,
+	  out_sec = link_sec->output_section;
+	  stub_sec = (*htab->add_stub_section) (s_name, out_sec, link_sec,
 						htab->nacl_p ? 4 : 3);
 	  if (stub_sec == NULL)
 	    return NULL;
@@ -4202,6 +4205,8 @@ elf32_arm_add_stub (const char *stub_name,
 				     TRUE, FALSE);
   if (stub_entry == NULL)
     {
+      if (section == NULL)
+	section = stub_sec;
       (*_bfd_error_handler) (_("%s: cannot create stub entry %s"),
 			     section->owner,
 			     stub_name);
@@ -5216,6 +5221,7 @@ elf32_arm_size_stubs (bfd *output_bfd,
 		      struct bfd_link_info *info,
 		      bfd_signed_vma group_size,
 		      asection * (*add_stub_section) (const char *, asection *,
+						      asection *,
 						      unsigned int),
 		      void (*layout_sections_again) (void))
 {

ld/ChangeLog

@@ -1,3 +1,10 @@
+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

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 (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");