Added new files elflink.c, elflink.h, elfcore.h.

Moved some mostly size-independent stuff from elfcode.h to elf.c, adding a data
structure to elfcode.h with some misc data and callback functions.  Added a
pointer to that structure to the target back end data.  More work can be done
here.

Renamed generic elf routines (not cpu-specific stuff) to start with bfd_elf or
_bfd_elf.  Updated most call sites, sometimes defined some macros.

Moved some dynamic linking support code from m68k, sparc, i386 to common files,
using target back end flags to control behavior.  More work can probably be
done here too.

Moved core- and linker-support code out of elfcode.h to elf.c, elfcore.h,
elflink.h, or elflink.c.  Now elfcode.h contains only .o and executable
support, plus #includes of elfcore.h and elflink.h.  Much of the contents of
these other header files can probably still be moved from the .h files to the
.c files, to get compiled only once.

Cleaned up some "gcc -Wall" warnings regarding unused or uninitialized
variables, in generic and cpu-specific code.

1 files changed, 10 insertions, 130 deletions

diff --git a/bfd/elf32-m68k.c b/bfd/elf32-m68k.c
index ed15b01..dae2dd2 100644
--- a/bfd/elf32-m68k.c
+++ b/bfd/elf32-m68k.c
@@ -29,10 +29,6 @@ static void rtype_to_howto
   PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
 static void rtype_to_howto_rel
   PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
-static boolean elf_m68k_create_dynamic_sections
-  PARAMS ((bfd *, struct bfd_link_info *));
-static boolean elf_m68k_create_got_section
-  PARAMS ((bfd *, struct bfd_link_info *));
 static boolean elf_m68k_check_relocs
   PARAMS ((bfd *, struct bfd_link_info *, asection *,
 	   const Elf_Internal_Rela *));
@@ -211,125 +207,6 @@ static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
   0, 0, 0, 0		  /* replaced with offset to start of .plt.  */
 };
 
-/* Create dynamic sections when linking against a dynamic object.  */
-
-static boolean
-elf_m68k_create_dynamic_sections (abfd, info)
-     bfd *abfd;
-     struct bfd_link_info *info;
-{
-  flagword flags;
-  register asection *s;
-
-  /* We need to create .plt, .rela.plt, .got, .got.plt, .dynbss, and
-     .rela.bss sections.  */
-
-  flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
-
-  s = bfd_make_section (abfd, ".plt");
-  if (s == NULL
-      || !bfd_set_section_flags (abfd, s, flags | SEC_READONLY | SEC_CODE)
-      || !bfd_set_section_alignment (abfd, s, 2))
-    return false;
-
-  s = bfd_make_section (abfd, ".rela.plt");
-  if (s == NULL
-      || !bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
-      || !bfd_set_section_alignment (abfd, s, 2))
-    return false;
-
-  if (!elf_m68k_create_got_section (abfd, info))
-    return false;
-
-  /* The .dynbss section is a place to put symbols which are defined
-     by dynamic objects, are referenced by regular objects, and are
-     not functions.  We must allocate space for them in the process
-     image and use a R_68K_COPY reloc to tell the dynamic linker to
-     initialize them at run time.  The linker script puts the .dynbss
-     section into the .bss section of the final image.  */
-  s = bfd_make_section (abfd, ".dynbss");
-  if (s == NULL
-      || !bfd_set_section_flags (abfd, s, SEC_ALLOC))
-    return false;
-
-  /* The .rela.bss section holds copy relocs.  This section is not
-     normally needed.  We need to create it here, though, so that the
-     linker will map it to an output section.  We can't just create it
-     only if we need it, because we will not know whether we need it
-     until we have seen all the input files, and the first time the
-     main linker code calls BFD after examining all the input files
-     (size_dynamic_sections) the input sections have already been
-     mapped to the output sections.  If the section turns out not to
-     be needed, we can discard it later.  We will never need this
-     section when generating a shared object, since they do not use
-     copy relocs.  */
-  if (!info->shared)
-    {
-      s = bfd_make_section (abfd, ".rela.bss");
-      if (s == NULL
-	  || !bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
-	  || !bfd_set_section_alignment (abfd, s, 2))
-	return false;
-    }
-
-  return true;
-}
-
-/* Create the .got section to hold the global offset table, and the
-   .got.plt section to hold procedure linkage table GOT entries.  The
-   linker script will put .got.plt into the output .got section.  */
-
-static boolean
-elf_m68k_create_got_section (abfd, info)
-     bfd *abfd;
-     struct bfd_link_info *info;
-{
-  flagword flags;
-  register asection *s;
-  struct elf_link_hash_entry *h;
-
-  /* This function may be called more than once.  */
-  if (bfd_get_section_by_name (abfd, ".got") != NULL)
-    return true;
-
-  flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
-
-  s = bfd_make_section (abfd, ".got");
-  if (s == NULL
-      || !bfd_set_section_flags (abfd, s, flags)
-      || !bfd_set_section_alignment (abfd, s, 2))
-    return false;
-
-  s = bfd_make_section (abfd, ".got.plt");
-  if (s == NULL
-      || !bfd_set_section_flags (abfd, s, flags)
-      || !bfd_set_section_alignment (abfd, s, 2))
-    return false;
-
-  /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the
-     .got.plt section, which will be placed at the start of the output
-     .got section.  We don't do this in the linker script because we
-     don't want to define the symbol if we are not creating a global
-     offset table.  */
-  h = NULL;
-  if (!(_bfd_generic_link_add_one_symbol
-	(info, abfd, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL, s, (bfd_vma) 0,
-	 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
-	 (struct bfd_link_hash_entry **) &h)))
-    return false;
-  h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
-  h->type = STT_OBJECT;
-
-  if (info->shared
-      && !bfd_elf32_link_record_dynamic_symbol (info, h))
-    return false;
-
-  /* The first three global offset table entries are reserved.  */
-  s->_raw_size += 3 * 4;
-
-  return true;
-}
-
 /* Look through the relocs for a section during the first phase, and
    allocate space in the global offset table or procedure linkage
    table.  */
@@ -394,7 +271,7 @@ elf_m68k_check_relocs (abfd, info, sec, relocs)
 	    {
 	      /* Create the .got section.  */
 	      elf_hash_table (info)->dynobj = dynobj = abfd;
-	      if (!elf_m68k_create_got_section (dynobj, info))
+	      if (!_bfd_elf_create_got_section (dynobj, info))
 		return false;
 	    }
 
@@ -523,7 +400,7 @@ elf_m68k_check_relocs (abfd, info, sec, relocs)
 		{
 		  const char *name;
 
-		  name = (elf_string_from_elf_section
+		  name = (bfd_elf_string_from_elf_section
 			  (abfd,
 			   elf_elfheader (abfd)->e_shstrndx,
 			   elf_section_data (sec)->rel_hdr.sh_name));
@@ -1275,7 +1152,7 @@ elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
 		{
 		  const char *name;
 
-		  name = (elf_string_from_elf_section
+		  name = (bfd_elf_string_from_elf_section
 			  (input_bfd,
 			   elf_elfheader (input_bfd)->e_shstrndx,
 			   elf_section_data (input_section)->rel_hdr.sh_name));
@@ -1374,9 +1251,9 @@ elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
 		  name = h->root.root.string;
 		else
 		  {
-		    name = elf_string_from_elf_section (input_bfd,
-							symtab_hdr->sh_link,
-							sym->st_name);
+		    name = bfd_elf_string_from_elf_section (input_bfd,
+							    symtab_hdr->sh_link,
+							    sym->st_name);
 		    if (name == NULL)
 		      return false;
 		    if (*name == '\0')
@@ -1674,7 +1551,7 @@ elf_m68k_finish_dynamic_sections (output_bfd, info)
 #define ELF_MACHINE_CODE		EM_68K
 #define ELF_MAXPAGESIZE			0x2000
 #define elf_backend_create_dynamic_sections \
-					elf_m68k_create_dynamic_sections
+					_bfd_elf_create_dynamic_sections
 #define elf_backend_check_relocs	elf_m68k_check_relocs
 #define elf_backend_adjust_dynamic_symbol \
 					elf_m68k_adjust_dynamic_symbol
@@ -1685,5 +1562,8 @@ elf_m68k_finish_dynamic_sections (output_bfd, info)
 					elf_m68k_finish_dynamic_symbol
 #define elf_backend_finish_dynamic_sections \
 					elf_m68k_finish_dynamic_sections
+#define elf_backend_want_got_plt 1
+#define elf_backend_plt_readonly 1
+#define elf_backend_want_plt_sym 0
 
 #include "elf32-target.h"