diff options
Diffstat (limited to 'bfd/elf32-mips.c')
| -rw-r--r-- | bfd/elf32-mips.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/bfd/elf32-mips.c b/bfd/elf32-mips.c index 5e5a96dd08..162ff412de 100644 --- a/bfd/elf32-mips.c +++ b/bfd/elf32-mips.c @@ -9849,6 +9849,181 @@ _bfd_elf32_mips_write_section (output_bfd, sec, contents) return true; } +/* Given a data section and an in-memory embedded reloc section, store + relocation information into the embedded reloc section which can be + used at runtime to relocate the data 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_mips_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; + Elf_Internal_Shdr *shndx_hdr; + Elf32_External_Sym *extsyms; + Elf32_External_Sym *free_extsyms = NULL; + Elf_External_Sym_Shndx *shndx_buf = NULL; + Elf_Internal_Rela *internal_relocs; + Elf_Internal_Rela *free_relocs = NULL; + Elf_Internal_Rela *irel, *irelend; + bfd_byte *p; + bfd_size_type amt; + + 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_bread (extsyms, symtab_hdr->sh_size, abfd) + != symtab_hdr->sh_size)) + goto error_return; + if (info->keep_memory) + symtab_hdr->contents = (unsigned char *) extsyms; + } + + shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr; + if (shndx_hdr->sh_size != 0) + { + amt = symtab_hdr->sh_info * sizeof (Elf_External_Sym_Shndx); + shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt); + if (shndx_buf == NULL) + goto error_return; + if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0 + || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt) + goto error_return; + } + + /* 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_MIPS_32) && + (ELF32_R_TYPE (irel->r_info) != (int) R_MIPS_64)) + { + *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) + { + Elf32_External_Sym *esym; + Elf_External_Sym_Shndx *shndx; + Elf_Internal_Sym isym; + + /* A local symbol. */ + esym = extsyms + ELF32_R_SYM (irel->r_info); + shndx = shndx_buf + (shndx_buf ? ELF32_R_SYM (irel->r_info) : 0); + bfd_elf32_swap_symbol_in (abfd, esym, shndx, &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); + h = elf_sym_hashes (abfd)[indx]; + targetsec = NULL; + /* + * For some reason, in certain programs, the symbol will + * not be in the hash table. It seems to happen when you + * declare a static table of pointers to const external structures. + * In this case, the relocs are relative to data, not + * text, so just treating it like an undefined link + * should be sufficient. + */ + 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; + } + + + /* + * Set the low bit of the relocation offset if it's a MIPS64 reloc. + * Relocations will always be on (at least) 32-bit boundaries. + */ + + bfd_put_32 (abfd, ((irel->r_offset + datasec->output_offset) + + ((ELF32_R_TYPE (irel->r_info) == (int) R_MIPS_64) ? 1 : 0)), + p); + memset (p + 4, 0, 8); + if (targetsec != NULL) + strncpy (p + 4, targetsec->output_section->name, 8); + } + + if (shndx_buf != NULL) + free (shndx_buf); + if (free_extsyms != NULL) + free (free_extsyms); + if (free_relocs != NULL) + free (free_relocs); + return true; + + error_return: + if (shndx_buf != NULL) + free (shndx_buf); + if (free_extsyms != NULL) + free (free_extsyms); + if (free_relocs != NULL) + free (free_relocs); + return false; +} + /* This is almost identical to bfd_generic_get_... except that some MIPS relocations need to be handled specially. Sigh. */ |
