X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=bfd%2Felf-s390-common.c;h=8df8dbac75513b4bb0f4f35c317297ba9b2c5031;hb=5496abe1c5c31aa6648e8fdb15e4122025bcabfe;hp=dd35c40bc99b4b449fa98eff5538f7b71fae1780;hpb=4b95cf5c0c75d6efc1b2f96af72317aecca079f1;p=deliverable%2Fbinutils-gdb.git diff --git a/bfd/elf-s390-common.c b/bfd/elf-s390-common.c index dd35c40bc9..8df8dbac75 100644 --- a/bfd/elf-s390-common.c +++ b/bfd/elf-s390-common.c @@ -1,5 +1,5 @@ /* IBM S/390-specific support for ELF 32 and 64 bit functions - Copyright (C) 2000-2014 Free Software Foundation, Inc. + Copyright (C) 2000-2020 Free Software Foundation, Inc. Contributed by Andreas Krebbel. This file is part of BFD, the Binary File Descriptor library. @@ -30,6 +30,87 @@ s390_is_ifunc_symbol_p (struct elf_link_hash_entry *h) return h->type == STT_GNU_IFUNC || eh->ifunc_resolver_address != 0; } +/* Return true if .got.plt is supposed to be emitted after .got. */ + +static inline bfd_boolean +s390_gotplt_after_got_p (struct bfd_link_info *info) +{ + struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info); + + if (!htab->elf.sgot || !htab->elf.sgotplt) + return TRUE; + + if (htab->elf.sgot->output_section == htab->elf.sgotplt->output_section) + { + if (htab->elf.sgot->output_offset < htab->elf.sgotplt->output_offset) + return TRUE; + } + else + { + if (htab->elf.sgot->output_section->vma + <= htab->elf.sgotplt->output_section->vma) + return TRUE; + } + return FALSE; +} + +/* Return the value of the _GLOBAL_OFFSET_TABLE_ symbol. */ + +static inline bfd_vma +s390_got_pointer (struct bfd_link_info *info) +{ + struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info); + bfd_vma got_pointer; + + BFD_ASSERT (htab && htab->elf.hgot); + + got_pointer = (htab->elf.hgot->root.u.def.section->output_section->vma + + htab->elf.hgot->root.u.def.section->output_offset); + /* Our ABI requires the GOT pointer to point at the very beginning + of the global offset table. */ + BFD_ASSERT (got_pointer + <= (htab->elf.sgot->output_section->vma + + htab->elf.sgot->output_offset)); + BFD_ASSERT (got_pointer + <= (htab->elf.sgotplt->output_section->vma + + htab->elf.sgotplt->output_offset)); + + return got_pointer; +} + + +/* Return the offset of the .got versus _GLOBAL_OFFSET_TABLE_. */ + +static inline bfd_vma +s390_got_offset (struct bfd_link_info *info) +{ + struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info); + + /* The absolute address of the .got in the target image. */ + bfd_vma got_address = (htab->elf.sgot->output_section->vma + + htab->elf.sgot->output_offset); + + /* GOT offset must not be negative. */ + BFD_ASSERT (s390_got_pointer (info) <= got_address); + return got_address - s390_got_pointer (info); +} + +/* Return the offset of the .got.plt versus _GLOBAL_OFFSET_TABLE_. */ + +static inline bfd_vma +s390_gotplt_offset (struct bfd_link_info *info) +{ + struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info); + + /* The absolute address of the .got.plt in the target image. */ + bfd_vma gotplt_address = (htab->elf.sgotplt->output_section->vma + + htab->elf.sgotplt->output_offset); + + /* GOT offset must not be negative. */ + BFD_ASSERT (s390_got_pointer (info) <= gotplt_address); + return gotplt_address - s390_got_pointer (info); +} + /* Create sections needed by STT_GNU_IFUNC symbol. */ static bfd_boolean @@ -45,13 +126,12 @@ s390_elf_create_ifunc_sections (bfd *abfd, struct bfd_link_info *info) flags = bed->dynamic_sec_flags; - if (info->shared) + if (bfd_link_pic (info)) { s = bfd_make_section_with_flags (abfd, ".rela.ifunc", flags | SEC_READONLY); if (s == NULL - || ! bfd_set_section_alignment (abfd, s, - bed->s->log_file_align)) + || !bfd_set_section_alignment (s, bed->s->log_file_align)) return FALSE; htab->irelifunc = s; } @@ -60,21 +140,19 @@ s390_elf_create_ifunc_sections (bfd *abfd, struct bfd_link_info *info) s = bfd_make_section_with_flags (abfd, ".iplt", flags | SEC_CODE | SEC_READONLY); if (s == NULL - || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) + || !bfd_set_section_alignment (s, bed->plt_alignment)) return FALSE; htab->iplt = s; s = bfd_make_section_with_flags (abfd, ".rela.iplt", flags | SEC_READONLY); if (s == NULL - || ! bfd_set_section_alignment (abfd, s, - bed->s->log_file_align)) + || !bfd_set_section_alignment (s, bed->s->log_file_align)) return FALSE; htab->irelplt = s; s = bfd_make_section_with_flags (abfd, ".igot.plt", flags); if (s == NULL - || !bfd_set_section_alignment (abfd, s, - bed->s->log_file_align)) + || !bfd_set_section_alignment (s, bed->s->log_file_align)) return FALSE; htab->igotplt = s; @@ -87,12 +165,12 @@ s390_elf_create_ifunc_sections (bfd *abfd, struct bfd_link_info *info) static bfd_boolean s390_elf_allocate_ifunc_dyn_relocs (struct bfd_link_info *info, - struct elf_link_hash_entry *h, - struct elf_dyn_relocs **head) + struct elf_link_hash_entry *h) { struct elf_dyn_relocs *p; struct elf_link_hash_table *htab; struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h; + struct elf_dyn_relocs **head = &eh->dyn_relocs; htab = elf_hash_table (info); eh->ifunc_resolver_address = h->root.u.def.value; @@ -102,10 +180,10 @@ s390_elf_allocate_ifunc_dyn_relocs (struct bfd_link_info *info, if (h->plt.refcount <= 0 && h->got.refcount <= 0) { /* When building shared library, we need to handle the case - where it is marked with regular reference, but not non-GOT + where it is marked with regular reference, but not non-GOT reference. It may happen if we didn't see STT_GNU_IFUNC symbol at the time when checking relocations. */ - if (info->shared + if (bfd_link_pic (info) && !h->non_got_ref && h->ref_regular) for (p = *head; p != NULL; p = p->next) @@ -151,7 +229,9 @@ keep: point to the IPLT slot. That way the referencing shared lib will always get the PLT slot address when resolving the respective R_390_GLOB_DAT/R_390_64 relocs on that symbol. */ - if (info->executable && !info->shared && h->def_regular && h->ref_dynamic) + if (bfd_link_pde (info) + && h->def_regular + && h->ref_dynamic) { h->root.u.def.section = htab->iplt; h->root.u.def.value = h->plt.offset; @@ -159,9 +239,7 @@ keep: h->type = STT_FUNC; } - /* We need dynamic relocation for STT_GNU_IFUNC symbol only when - there is a non-GOT reference in a shared object. */ - if (!info->shared || !h->non_got_ref) + if (!bfd_link_pic (info)) *head = NULL; /* Finally, allocate space. */ @@ -182,9 +260,9 @@ keep: avoided if the values in the GOT slots could differ for pointer equality reasons. */ if (h->got.refcount <= 0 - || (info->shared + || (bfd_link_pic (info) && (h->dynindx == -1 || h->forced_local)) - || (info->executable && info->shared) + || bfd_link_pie (info) || htab->sgot == NULL) { /* Use .got.iplt. */ @@ -194,7 +272,7 @@ keep: { h->got.offset = htab->sgot->size; htab->sgot->size += GOT_ENTRY_SIZE; - if (info->shared) + if (bfd_link_pic (info)) htab->srelgot->size += RELA_ENTRY_SIZE; } @@ -207,9 +285,9 @@ elf_s390_allocate_local_syminfo (bfd *abfd, Elf_Internal_Shdr *symtab_hdr) bfd_size_type size; size = symtab_hdr->sh_info; - size *= (sizeof (bfd_signed_vma) /* local got */ - + sizeof (struct plt_entry) /* local plt */ - + sizeof(char)); /* local tls type */ + size *= (sizeof (bfd_signed_vma) /* local got */ + + sizeof (struct plt_entry) /* local plt */ + + sizeof(char)); /* local tls type */ elf_local_got_refcounts (abfd) = ((bfd_signed_vma *) bfd_zalloc (abfd, size)); if (elf_local_got_refcounts (abfd) == NULL) @@ -223,20 +301,76 @@ elf_s390_allocate_local_syminfo (bfd *abfd, Elf_Internal_Shdr *symtab_hdr) return TRUE; } -/* Pick ELFOSABI_GNU if IFUNC symbols are used. */ +/* Whether to sort relocs output by ld -r or ld --emit-relocs, by + r_offset. Don't do so for code sections. We want to keep ordering + of GDCALL / PLT32DBL for TLS optimizations as is. On the other + hand, elf-eh-frame.c processing requires .eh_frame relocs to be + sorted. */ static bfd_boolean -elf_s390_add_symbol_hook (bfd *abfd, - struct bfd_link_info *info, - Elf_Internal_Sym *sym, - const char **namep ATTRIBUTE_UNUSED, - flagword *flagsp ATTRIBUTE_UNUSED, - asection **secp ATTRIBUTE_UNUSED, - bfd_vma *valp ATTRIBUTE_UNUSED) +elf_s390_elf_sort_relocs_p (asection *sec) { - if ((abfd->flags & DYNAMIC) == 0 - && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) - elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE; + return (sec->flags & SEC_CODE) == 0; +} + +/* Merge object attributes from IBFD into OBFD. Raise an error if + there are conflicting attributes. */ +static bfd_boolean +elf_s390_merge_obj_attributes (bfd *ibfd, struct bfd_link_info *info) +{ + bfd *obfd = info->output_bfd; + obj_attribute *in_attr, *in_attrs; + obj_attribute *out_attr, *out_attrs; + + if (!elf_known_obj_attributes_proc (obfd)[0].i) + { + /* This is the first object. Copy the attributes. */ + _bfd_elf_copy_obj_attributes (ibfd, obfd); + + /* Use the Tag_null value to indicate the attributes have been + initialized. */ + elf_known_obj_attributes_proc (obfd)[0].i = 1; + + return TRUE; + } + + in_attrs = elf_known_obj_attributes (ibfd)[OBJ_ATTR_GNU]; + out_attrs = elf_known_obj_attributes (obfd)[OBJ_ATTR_GNU]; + + /* Check for conflicting Tag_GNU_S390_ABI_Vector attributes and + merge non-conflicting ones. */ + in_attr = &in_attrs[Tag_GNU_S390_ABI_Vector]; + out_attr = &out_attrs[Tag_GNU_S390_ABI_Vector]; + + if (in_attr->i > 2) + _bfd_error_handler + /* xgettext:c-format */ + (_("warning: %pB uses unknown vector ABI %d"), ibfd, + in_attr->i); + else if (out_attr->i > 2) + _bfd_error_handler + /* xgettext:c-format */ + (_("warning: %pB uses unknown vector ABI %d"), obfd, + out_attr->i); + else if (in_attr->i != out_attr->i) + { + out_attr->type = ATTR_TYPE_FLAG_INT_VAL; + + if (in_attr->i && out_attr->i) + { + const char abi_str[3][9] = { "none", "software", "hardware" }; + + _bfd_error_handler + /* xgettext:c-format */ + (_("warning: %pB uses vector %s ABI, %pB uses %s ABI"), + ibfd, abi_str[in_attr->i], obfd, abi_str[out_attr->i]); + } + if (in_attr->i > out_attr->i) + out_attr->i = in_attr->i; + } + + /* Merge Tag_compatibility attributes and any common GNU ones. */ + _bfd_elf_merge_object_attributes (ibfd, info); return TRUE; }