+#define nlm_fixed_header(bfd) (nlm_tdata (bfd) -> nlm_fixed_hdr)
+#define nlm_variable_header(bfd) (nlm_tdata (bfd) -> nlm_variable_hdr)
+#define nlm_version_header(bfd) (nlm_tdata (bfd) -> nlm_version_hdr)
+#define nlm_copyright_header(bfd) (nlm_tdata (bfd) -> nlm_copyright_hdr)
+#define nlm_extended_header(bfd) (nlm_tdata (bfd) -> nlm_extended_hdr)
+#define nlm_custom_header(bfd) (nlm_tdata (bfd) -> nlm_custom_hdr)
+#define nlm_cygnus_ext_header(bfd) (nlm_tdata (bfd) -> nlm_cygnus_ext_hdr)
+#define nlm_get_symbols(bfd) (nlm_tdata (bfd) -> nlm_symbols)
+#define nlm_set_symbols(bfd, p) (nlm_tdata (bfd) -> nlm_symbols = (p))
+#define nlm_set_text_low(bfd, i) (nlm_tdata (bfd) -> nlm_text_low = (i))
+#define nlm_get_text_low(bfd) (nlm_tdata (bfd) -> nlm_text_low)
+#define nlm_set_data_low(bfd, i) (nlm_tdata (bfd) -> nlm_data_low = (i))
+#define nlm_get_data_low(bfd) (nlm_tdata (bfd) -> nlm_data_low)
+#define nlm_relocation_fixups(bfd) (nlm_tdata (bfd) -> nlm_reloc_fixups)
+#define nlm_relocation_fixup_secs(bfd) (nlm_tdata (bfd) -> nlm_reloc_fixup_secs)
+#define nlm_alpha_backend_data(bfd) (&nlm_tdata (bfd) -> backend_data.alpha_backend_data)
+
+/* This is used when writing out the external relocs. */
+
+struct reloc_and_sec
+{
+ arelent *rel;
+ asection *sec;
+};
+
+/* We store some function pointer in the backend structure. This lets
+ different NLM targets share most of the same code, while providing
+ slightly different code where necessary. */
+
+struct nlm_backend_data
+{
+ /* Signature for this backend. */
+ char signature[NLM_SIGNATURE_SIZE];
+ /* Size of the fixed header. */
+ bfd_size_type fixed_header_size;
+ /* Size of optional prefix for this backend. Some backend may
+ require this to be a function, but so far a constant is OK. This
+ is for a prefix which precedes the standard NLM fixed header. */
+ bfd_size_type optional_prefix_size;
+ /* Architecture. */
+ enum bfd_architecture arch;
+ /* Machine. */
+ unsigned int mach;
+ /* Some NLM formats do not use the uninitialized data section, so
+ all uninitialized data must be put into the regular data section
+ instead. */
+ bfd_boolean no_uninitialized_data;
+ /* Some NLM formats have a prefix on the file. If this function is
+ not NULL, it will be called by nlm_object_p. It should return
+ TRUE if this file could match this format, and it should leave
+ the BFD such that a bfd_bread will pick up the fixed header. */
+ bfd_boolean (*nlm_backend_object_p) (bfd *);
+ /* Write out the prefix. This function may be NULL. This must
+ write out the same number of bytes as is in the field
+ optional_prefix_size. */
+ bfd_boolean (*nlm_write_prefix) (bfd *);
+ /* Read a relocation fixup from abfd. The reloc information is
+ machine specific. The second argument is the symbol if this is
+ an import, or NULL if this is a reloc fixup. This function
+ should set the third argument to the section which the reloc
+ belongs in, and the fourth argument to the reloc itself; it does
+ not need to fill in the sym_ptr_ptr field for a reloc against an
+ import symbol. */
+ bfd_boolean (*nlm_read_reloc) (bfd *, nlmNAME (symbol_type) *, asection **, arelent *);
+ /* To make objcopy to an i386 NLM work, the i386 backend needs a
+ chance to work over the relocs. This is a bit icky. */
+ bfd_boolean (*nlm_mangle_relocs) (bfd *, asection *, const void *, bfd_vma, bfd_size_type);
+ /* Read an import record from abfd. It would be nice if this
+ were in a machine-dependent format, but it doesn't seem to be. */
+ bfd_boolean (*nlm_read_import) (bfd *, nlmNAME (symbol_type) *);
+ /* Write an import record to abfd. */
+ bfd_boolean (*nlm_write_import) (bfd *, asection *, arelent *);
+ /* Set the section for a public symbol. This may be NULL, in which
+ case a default method will be used. */
+ bfd_boolean (*nlm_set_public_section) (bfd *, nlmNAME (symbol_type) *);
+ /* Get the offset to write out for a public symbol. This may be
+ NULL, in which case a default method will be used. */
+ bfd_vma (*nlm_get_public_offset) (bfd *, asymbol *);
+ /* Swap the fixed header in and out */
+ void (*nlm_swap_fhdr_in) (bfd *, void *, Nlm_Internal_Fixed_Header *);
+ void (*nlm_swap_fhdr_out) (bfd *, struct nlm_internal_fixed_header *, void *);
+ /* Write out an external reference. */
+ bfd_boolean (*nlm_write_external) (bfd *, bfd_size_type, asymbol *, struct reloc_and_sec *);
+ bfd_boolean (*nlm_write_export) (bfd *, asymbol *, bfd_vma);
+};
+
+#define nlm_backend(bfd) ((struct nlm_backend_data *)((bfd) -> xvec -> backend_data))
+#define nlm_signature(bfd) (nlm_backend (bfd) -> signature)
+#define nlm_fixed_header_size(bfd) (nlm_backend (bfd) -> fixed_header_size)
+#define nlm_optional_prefix_size(bfd) (nlm_backend (bfd) -> optional_prefix_size)
+#define nlm_architecture(bfd) (nlm_backend (bfd) -> arch)
+#define nlm_machine(bfd) (nlm_backend (bfd) -> mach)
+#define nlm_no_uninitialized_data(bfd) (nlm_backend (bfd) -> no_uninitialized_data)
+#define nlm_backend_object_p_func(bfd) (nlm_backend (bfd) -> nlm_backend_object_p)
+#define nlm_write_prefix_func(bfd) (nlm_backend (bfd) -> nlm_write_prefix)
+#define nlm_read_reloc_func(bfd) (nlm_backend (bfd) -> nlm_read_reloc)
+#define nlm_mangle_relocs_func(bfd) (nlm_backend (bfd) -> nlm_mangle_relocs)
+#define nlm_read_import_func(bfd) (nlm_backend (bfd) -> nlm_read_import)
+#define nlm_write_import_func(bfd) (nlm_backend (bfd) -> nlm_write_import)
+#define nlm_set_public_section_func(bfd) (nlm_backend (bfd) -> nlm_set_public_section)
+#define nlm_get_public_offset_func(bfd) (nlm_backend (bfd) -> nlm_get_public_offset)
+#define nlm_swap_fixed_header_in_func(bfd) (nlm_backend (bfd) -> nlm_swap_fhdr_in)
+#define nlm_swap_fixed_header_out_func(bfd)(nlm_backend (bfd) -> nlm_swap_fhdr_out)
+#define nlm_write_external_func(bfd) (nlm_backend (bfd) -> nlm_write_external)
+#define nlm_write_export_func(bfd) (nlm_backend (bfd) -> nlm_write_export)