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authorNick Clifton <nickc@redhat.com>2000-09-15 18:52:52 +0000
committerNick Clifton <nickc@redhat.com>2000-09-15 18:52:52 +0000
commit0752970ef843fa6a9e7ac8bb5a30608eded7f228 (patch)
tree681414cd31e8fe3f2fb29df4cbcd4c91520f64b3 /bfd/elf32-m68k.c
parentffcb7aff0f99aaa26b99e04b8258009279096402 (diff)
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add support for embedded relocs in m68k ELF port
Diffstat (limited to 'bfd/elf32-m68k.c')
-rw-r--r--bfd/elf32-m68k.c138
1 files changed, 138 insertions, 0 deletions
diff --git a/bfd/elf32-m68k.c b/bfd/elf32-m68k.c
index 96d636c..d53cfdf 100644
--- a/bfd/elf32-m68k.c
+++ b/bfd/elf32-m68k.c
@@ -2179,6 +2179,144 @@ elf_m68k_finish_dynamic_sections (output_bfd, info)
return true;
}
+/* Given a .data section and a .emreloc in-memory section, store
+ relocation information into the .emreloc section which can be
+ used at runtime to relocate the section. This is called by the
+ linker when the --embedded-relocs switch is used. This is called
+ after the add_symbols entry point has been called for all the
+ objects, and before the final_link entry point is called. */
+
+boolean
+bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
+ bfd *abfd;
+ struct bfd_link_info *info;
+ asection *datasec;
+ asection *relsec;
+ char **errmsg;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf32_External_Sym *extsyms;
+ Elf32_External_Sym *free_extsyms = NULL;
+ Elf_Internal_Rela *internal_relocs;
+ Elf_Internal_Rela *free_relocs = NULL;
+ Elf_Internal_Rela *irel, *irelend;
+ bfd_byte *p;
+
+ BFD_ASSERT (! info->relocateable);
+
+ *errmsg = NULL;
+
+ if (datasec->reloc_count == 0)
+ return true;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ /* Read this BFD's symbols if we haven't done so already, or get the cached
+ copy if it exists. */
+ if (symtab_hdr->contents != NULL)
+ extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
+ else
+ {
+ /* Go get them off disk. */
+ if (info->keep_memory)
+ extsyms = ((Elf32_External_Sym *)
+ bfd_alloc (abfd, symtab_hdr->sh_size));
+ else
+ extsyms = ((Elf32_External_Sym *)
+ bfd_malloc (symtab_hdr->sh_size));
+ if (extsyms == NULL)
+ goto error_return;
+ if (! info->keep_memory)
+ free_extsyms = extsyms;
+ if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
+ || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd)
+ != symtab_hdr->sh_size))
+ goto error_return;
+ if (info->keep_memory)
+ symtab_hdr->contents = extsyms;
+ }
+
+ /* Get a copy of the native relocations. */
+ internal_relocs = (_bfd_elf32_link_read_relocs
+ (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
+ info->keep_memory));
+ if (internal_relocs == NULL)
+ goto error_return;
+ if (! info->keep_memory)
+ free_relocs = internal_relocs;
+
+ relsec->contents = (bfd_byte *) bfd_alloc (abfd, datasec->reloc_count * 12);
+ if (relsec->contents == NULL)
+ goto error_return;
+
+ p = relsec->contents;
+
+ irelend = internal_relocs + datasec->reloc_count;
+ for (irel = internal_relocs; irel < irelend; irel++, p += 12)
+ {
+ asection *targetsec;
+
+ /* We are going to write a four byte longword into the runtime
+ reloc section. The longword will be the address in the data
+ section which must be relocated. It is followed by the name
+ of the target section NUL-padded or truncated to 8
+ characters. */
+
+ /* We can only relocate absolute longword relocs at run time. */
+ if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
+ {
+ *errmsg = _("unsupported reloc type");
+ bfd_set_error (bfd_error_bad_value);
+ goto error_return;
+ }
+
+ /* Get the target section referred to by the reloc. */
+ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+ {
+ Elf_Internal_Sym isym;
+
+ /* A local symbol. */
+ bfd_elf32_swap_symbol_in (abfd,
+ extsyms + ELF32_R_SYM (irel->r_info),
+ &isym);
+
+ targetsec = bfd_section_from_elf_index (abfd, isym.st_shndx);
+ }
+ else
+ {
+ unsigned long indx;
+ struct elf_link_hash_entry *h;
+
+ /* An external symbol. */
+ indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
+ h = elf_sym_hashes (abfd)[indx];
+ BFD_ASSERT (h != NULL);
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ targetsec = h->root.u.def.section;
+ else
+ targetsec = NULL;
+ }
+
+ bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
+ memset (p + 4, 0, 8);
+ if (targetsec != NULL)
+ strncpy (p + 4, targetsec->output_section->name, 8);
+ }
+
+ if (free_extsyms != NULL)
+ free (free_extsyms);
+ if (free_relocs != NULL)
+ free (free_relocs);
+ return true;
+
+error_return:
+ if (free_extsyms != NULL)
+ free (free_extsyms);
+ if (free_relocs != NULL)
+ free (free_relocs);
+ return false;
+}
+
#define TARGET_BIG_SYM bfd_elf32_m68k_vec
#define TARGET_BIG_NAME "elf32-m68k"
#define ELF_MACHINE_CODE EM_68K