Mapping symbols for interworking glue.

[Paul Brook <paul at codesourcery dot com>]

The attached patch adds mapping symbols for linker generated ARM/Thumb 
interworking glue. Due to problems creating multiple symbols with the same 
name this uses the same trick as for the PLT.

Tested on arm-none-eabi.
Applied to CVS head.

Paul

2007-05-22  Paul Brook  <paul@codesourcery.com>

	ld/testsuite/
	* ld-arm/arm-pic-veneer.d: Update expected output.
	* ld-arm/arm-call.d: Ditto.

	bfd/
	* elf32-arm.c (output_arch_syminfo): Replace plt_shndx and plt_offset
	with sec and sec_shndx.
	(elf32_arm_ouput_plt_map_sym): Use them.
	(elf32_arm_output_arch_local_syms): Output mapping symbols for
	interworking glue.

Index: ld/testsuite/ld-arm/arm-pic-veneer.d
===================================================================
--- ld/testsuite/ld-arm/arm-pic-veneer.d	(revision 171910)
+++ ld/testsuite/ld-arm/arm-pic-veneer.d	(working copy)
@@ -14,4 +14,4 @@ Disassembly of section .text:
     8008:	e59fc004 	ldr	ip, \[pc, #4\]	; 8014 <__foo_from_arm\+0xc>
     800c:	e08cc00f 	add	ip, ip, pc
     8010:	e12fff1c 	bx	ip
-    8014:	fffffff1 	undefined instruction 0xfffffff1
+    8014:	fffffff1 	.word	0xfffffff1
Index: ld/testsuite/ld-arm/arm-call.d
===================================================================
--- ld/testsuite/ld-arm/arm-call.d	(revision 171910)
+++ ld/testsuite/ld-arm/arm-call.d	(working copy)
@@ -49,8 +49,8 @@ Disassembly of section .text:
 
 0000805c <__t1_from_arm>:
     805c:	e51ff004 	ldr	pc, \[pc, #-4\]	; 8060 <__t1_from_arm\+0x4>
-    8060:	00008041 	andeq	r8, r0, r1, asr #32
+    8060:	00008041 	.word	0x00008041
 
 00008064 <__t2_from_arm>:
     8064:	e51ff004 	ldr	pc, \[pc, #-4\]	; 8068 <__t2_from_arm\+0x4>
-    8068:	00008043 	andeq	r8, r0, r3, asr #32
+    8068:	00008043 	.word	0x00008043
Index: bfd/elf32-arm.c
===================================================================
--- bfd/elf32-arm.c	(revision 171910)
+++ bfd/elf32-arm.c	(working copy)
@@ -10048,8 +10048,8 @@ typedef struct
 {
   void *finfo;
   struct bfd_link_info *info;
-  int plt_shndx;
-  bfd_vma plt_offset;
+  asection *sec;
+  int sec_shndx;
   bfd_boolean (*func) (void *, const char *, Elf_Internal_Sym *,
 		       asection *, struct elf_link_hash_entry *);
 } output_arch_syminfo;
@@ -10074,12 +10074,14 @@ elf32_arm_ouput_plt_map_sym (output_arch
   Elf_Internal_Sym sym;
 
   htab = elf32_arm_hash_table (osi->info);
-  sym.st_value = osi->plt_offset + offset;
+  sym.st_value = osi->sec->output_section->vma
+		 + osi->sec->output_offset
+		 + offset;
   sym.st_size = 0;
   sym.st_other = 0;
   sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_NOTYPE);
-  sym.st_shndx = osi->plt_shndx;
-  if (!osi->func (osi->finfo, names[type], &sym, htab->splt, NULL))
+  sym.st_shndx = osi->sec_shndx;
+  if (!osi->func (osi->finfo, names[type], &sym, osi->sec, NULL))
     return FALSE;
   return TRUE;
 }
@@ -10163,7 +10165,7 @@ elf32_arm_output_plt_map (struct elf_lin
 }
 
 
-/* Output mapping symbols for the PLT.  */
+/* Output mapping symbols for linker generated sections.  */
 
 static bfd_boolean
 elf32_arm_output_arch_local_syms (bfd *output_bfd,
@@ -10175,19 +10177,63 @@ elf32_arm_output_arch_local_syms (bfd *o
 {
   output_arch_syminfo osi;
   struct elf32_arm_link_hash_table *htab;
+  bfd_vma offset;
+  bfd_size_type size;
 
   htab = elf32_arm_hash_table (info);
-  if (!htab->splt || htab->splt->size == 0)
-    return TRUE;
-
   check_use_blx(htab);
+
   osi.finfo = finfo;
   osi.info = info;
   osi.func = func;
-  osi.plt_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
-      htab->splt->output_section);
-  osi.plt_offset = htab->splt->output_section->vma;
+  
+  /* ARM->Thumb glue.  */
+  if (htab->arm_glue_size > 0)
+    {
+      osi.sec = bfd_get_section_by_name (htab->bfd_of_glue_owner,
+					 ARM2THUMB_GLUE_SECTION_NAME);
+
+      osi.sec_shndx = _bfd_elf_section_from_bfd_section
+	  (output_bfd, osi.sec->output_section);
+      if (info->shared || htab->root.is_relocatable_executable
+	  || htab->pic_veneer)
+	size = ARM2THUMB_PIC_GLUE_SIZE;
+      else if (htab->use_blx)
+	size = ARM2THUMB_V5_STATIC_GLUE_SIZE;
+      else
+	size = ARM2THUMB_STATIC_GLUE_SIZE;
 
+      for (offset = 0; offset < htab->arm_glue_size; offset += size)
+	{
+	  elf32_arm_ouput_plt_map_sym (&osi, ARM_MAP_ARM, offset);
+	  elf32_arm_ouput_plt_map_sym (&osi, ARM_MAP_DATA, offset + size - 4);
+	}
+    }
+
+  /* Thumb->ARM glue.  */
+  if (htab->thumb_glue_size > 0)
+    {
+      osi.sec = bfd_get_section_by_name (htab->bfd_of_glue_owner,
+					 THUMB2ARM_GLUE_SECTION_NAME);
+
+      osi.sec_shndx = _bfd_elf_section_from_bfd_section
+	  (output_bfd, osi.sec->output_section);
+      size = THUMB2ARM_GLUE_SIZE;
+
+      for (offset = 0; offset < htab->thumb_glue_size; offset += size)
+	{
+	  elf32_arm_ouput_plt_map_sym (&osi, ARM_MAP_THUMB, offset);
+	  elf32_arm_ouput_plt_map_sym (&osi, ARM_MAP_ARM, offset + 4);
+	}
+    }
+
+  /* Finally, output mapping symbols for the PLT.  */
+  if (!htab->splt || htab->splt->size == 0)
+    return TRUE;
+
+  osi.sec_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
+      htab->splt->output_section);
+  osi.sec = htab->splt;
   /* Output mapping symbols for the plt header.  SymbianOS does not have a
      plt header.  */
   if (htab->vxworks_p)