diff options
Diffstat (limited to 'bfd/elf64-ppc.c')
| -rw-r--r-- | bfd/elf64-ppc.c | 135 |
1 files changed, 115 insertions, 20 deletions
diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c index 8ae3f12..3ed9042 100644 --- a/bfd/elf64-ppc.c +++ b/bfd/elf64-ppc.c @@ -92,6 +92,7 @@ static bfd_reloc_status_type ppc64_elf_unhandled_reloc #define elf_backend_finish_dynamic_symbol ppc64_elf_finish_dynamic_symbol #define elf_backend_reloc_type_class ppc64_elf_reloc_type_class #define elf_backend_finish_dynamic_sections ppc64_elf_finish_dynamic_sections +#define elf_backend_link_output_symbol_hook ppc64_elf_output_symbol_hook #define elf_backend_special_sections ppc64_elf_special_sections /* The name of the dynamic interpreter. This is put in the .interp @@ -2641,7 +2642,7 @@ struct plt_entry pointers must reference the descriptor. Thus, a function pointer initialized to the address of a function in a shared library will either require a copy reloc, or a dynamic reloc. Using a copy reloc - redefines the function desctriptor symbol to point to the copy. This + redefines the function descriptor symbol to point to the copy. This presents a problem as a plt entry for that function is also initialized from the function descriptor symbol and the copy reloc may not be initialized first. */ @@ -2762,6 +2763,9 @@ struct ppc_link_hash_entry unsigned int is_func_descriptor:1; unsigned int is_entry:1; + /* Whether global opd sym has been adjusted or not. */ + unsigned int adjust_done:1; + /* Contexts in which symbol is used in the GOT (or TOC). TLS_GD .. TLS_EXPLICIT bits are or'd into the mask as the corresponding relocs are encountered during check_relocs. @@ -2971,6 +2975,7 @@ link_hash_newfunc (struct bfd_hash_entry *entry, eh->is_func = 0; eh->is_func_descriptor = 0; eh->is_entry = 0; + eh->adjust_done = 0; eh->tls_mask = 0; } @@ -3359,7 +3364,8 @@ ppc64_elf_copy_indirect_symbol edir->tls_mask |= eind->tls_mask; mask = (ELF_LINK_HASH_REF_DYNAMIC | ELF_LINK_HASH_REF_REGULAR - | ELF_LINK_HASH_REF_REGULAR_NONWEAK | ELF_LINK_NON_GOT_REF); + | ELF_LINK_HASH_REF_REGULAR_NONWEAK | ELF_LINK_NON_GOT_REF + | ELF_LINK_HASH_NEEDS_PLT); /* If called to transfer flags for a weakdef during processing of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF. We clear it ourselves for ELIMINATE_COPY_RELOCS. */ @@ -4874,10 +4880,53 @@ get_tls_mask (char **tls_maskp, unsigned long *toc_symndx, return 1; } +/* Adjust all global syms defined in opd sections. In gcc generated + code these will already have been done, but I suppose we have to + cater for all sorts of hand written assembly. */ + +static bfd_boolean +adjust_opd_syms (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED) +{ + struct ppc_link_hash_entry *eh; + asection *sym_sec; + long *opd_adjust; + + if (h->root.type == bfd_link_hash_indirect) + return TRUE; + + if (h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + if (h->root.type != bfd_link_hash_defined + && h->root.type != bfd_link_hash_defweak) + return TRUE; + + eh = (struct ppc_link_hash_entry *) h; + if (eh->adjust_done) + return TRUE; + + sym_sec = eh->elf.root.u.def.section; + if (sym_sec != NULL + && elf_section_data (sym_sec) != NULL + && (opd_adjust = ppc64_elf_section_data (sym_sec)->opd.adjust) != NULL) + { + eh->elf.root.u.def.value += opd_adjust[eh->elf.root.u.def.value / 24]; + eh->adjust_done = 1; + } + return TRUE; +} + +/* Remove unused Official Procedure Descriptor entries. Currently we + only remove those associated with functions in discarded link-once + sections, or weakly defined functions that have been overridden. It + would be possible to remove many more entries for statically linked + applications. */ + bfd_boolean ppc64_elf_edit_opd (bfd *obfd, struct bfd_link_info *info) { bfd *ibfd; + bfd_boolean some_edited = FALSE; for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) { @@ -5078,23 +5127,25 @@ ppc64_elf_edit_opd (bfd *obfd, struct bfd_link_info *info) if (h != NULL) { - /* Redefine the function descriptor symbol - to this location in the opd section. - We've checked above that opd relocs are - ordered. */ + /* Redefine the function descriptor symbol to + this location in the opd section. It is + necessary to update the value here rather + than using an array of adjustments as we do + for local symbols, because various places + in the generic ELF code use the value + stored in u.def.value. */ fdh->elf.root.u.def.value = wptr - sec->contents; - } - else - { - /* Local syms are a bit tricky. We could - tweak them as they can be cached, but - we'd need to look through the local syms - for the function descriptor sym which we - don't have at the moment. So keep an - array of adjustments. */ - adjust[rel->r_offset / 24] = wptr - rptr; + fdh->adjust_done = 1; } + /* Local syms are a bit tricky. We could + tweak them as they can be cached, but + we'd need to look through the local syms + for the function descriptor sym which we + don't have at the moment. So keep an + array of adjustments. */ + adjust[rel->r_offset / 24] = wptr - rptr; + if (wptr != rptr) memcpy (wptr, rptr, 24); wptr += 24; @@ -5152,6 +5203,7 @@ ppc64_elf_edit_opd (bfd *obfd, struct bfd_link_info *info) elf_section_data (sec)->rel_hdr.sh_size = sec->reloc_count * elf_section_data (sec)->rel_hdr.sh_entsize; BFD_ASSERT (elf_section_data (sec)->rel_hdr2 == NULL); + some_edited = TRUE; } else if (elf_section_data (sec)->relocs != relstart) free (relstart); @@ -5166,6 +5218,9 @@ ppc64_elf_edit_opd (bfd *obfd, struct bfd_link_info *info) } } + if (some_edited) + elf_link_hash_traverse (elf_hash_table (info), adjust_opd_syms, NULL); + return TRUE; } @@ -5261,7 +5316,17 @@ ppc64_elf_tls_optimize (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) value = h->root.u.def.value; } else - value = sym->st_value; + { + value = sym->st_value; + + if (elf_section_data (sym_sec) != NULL) + { + long *adjust; + adjust = ppc64_elf_section_data (sym_sec)->opd.adjust; + if (adjust != NULL) + value += adjust[value / 24]; + } + } ok_tprel = FALSE; is_local = FALSE; @@ -6069,8 +6134,9 @@ ppc_type_of_stub (asection *input_sec, } } - if (h->elf.root.type != bfd_link_hash_defined - && h->elf.root.type != bfd_link_hash_defweak) + if (!(h->elf.root.type == bfd_link_hash_defined + || h->elf.root.type == bfd_link_hash_defweak) + || h->elf.root.u.def.section->output_section == NULL) return ppc_stub_none; } @@ -6565,6 +6631,9 @@ toc_adjusting_stub_needed (struct bfd_link_info *info, asection *isec) if ((isec->flags & SEC_LINKER_CREATED) != 0) return 0; + if (isec->_raw_size == 0) + return 0; + /* Hack for linux kernel. .fixup contains branches, but only back to the function that hit an exception. */ branch_ok = strcmp (isec->name, ".fixup") == 0; @@ -7397,7 +7466,7 @@ ppc64_elf_relocate_section (bfd *output_bfd, long *opd_sym_adjust; opd_sym_adjust = ppc64_elf_section_data (sec)->opd.adjust; - if (opd_sym_adjust != NULL && sym->st_value % 24 == 0) + if (opd_sym_adjust != NULL) relocation += opd_sym_adjust[sym->st_value / 24]; } } @@ -8668,6 +8737,32 @@ ppc64_elf_relocate_section (bfd *output_bfd, return ret; } +/* Adjust the value of any local symbols in opd sections. */ + +static bfd_boolean +ppc64_elf_output_symbol_hook (struct bfd_link_info *info, + const char *name ATTRIBUTE_UNUSED, + Elf_Internal_Sym *elfsym, + asection *input_sec, + struct elf_link_hash_entry *h) +{ + long *adjust; + bfd_vma value; + + if (h != NULL + || input_sec == NULL + || ppc64_elf_section_data (input_sec) == NULL + || (adjust = ppc64_elf_section_data (input_sec)->opd.adjust) == NULL) + return TRUE; + + value = elfsym->st_value - input_sec->output_offset; + if (!info->relocatable) + value -= input_sec->output_section->vma; + + elfsym->st_value += adjust[value / 24]; + return TRUE; +} + /* Finish up dynamic symbol handling. We set the contents of various dynamic sections here. */ |