/* ELF STT_GNU_IFUNC support.
- Copyright (C) 2009-2017 Free Software Foundation, Inc.
+ Copyright (C) 2009-2020 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
s = bfd_make_section_with_flags (abfd, rel_sec,
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;
}
for static executables. */
s = bfd_make_section_with_flags (abfd, ".iplt", pltflags);
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;
? ".rela.iplt" : ".rel.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;
else
s = bfd_make_section_with_flags (abfd, ".igot", 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;
}
the resolved function may be used. But in non-PIC executable,
the address of its .plt slot may be used. Pointer equality may
not work correctly. PIE or non-PLT reference should be used if
- pointer equality is required here. */
+ pointer equality is required here.
+
+ If STT_GNU_IFUNC symbol is defined in position-dependent executable,
+ backend should change it to the normal function and set its address
+ to its PLT entry which should be resolved by R_*_IRELATIVE at
+ run-time. All external references should be resolved to its PLT in
+ executable. */
if (!need_dynreloc
+ && !(bfd_link_pde (info) && h->def_regular)
&& (h->dynindx != -1
|| info->export_dynamic)
&& h->pointer_equality_needed)
info->callbacks->einfo
/* xgettext:c-format */
(_("%F%P: dynamic STT_GNU_IFUNC symbol `%s' with pointer "
- "equality in `%B' can not be used when making an "
+ "equality in `%pB' can not be used when making an "
"executable; recompile with -fPIE and relink with -pie\n"),
h->root.root.string,
h->root.u.def.section->owner);
return TRUE;
}
-keep:
+ keep:
bed = get_elf_backend_data (info->output_bfd);
if (bed->rela_plts_and_copies_p)
sizeof_reloc = bed->s->sizeof_rela;
return TRUE;
}
-
-/* Similar to _bfd_elf_get_synthetic_symtab, optimized for unsorted PLT
- entries. PLT is the PLT section. PLT_SYM_VAL is a function pointer
- which returns an array of PLT entry symbol values. */
-
-long
-_bfd_elf_ifunc_get_synthetic_symtab
- (bfd *abfd, long symcount ATTRIBUTE_UNUSED,
- asymbol **syms ATTRIBUTE_UNUSED, long dynsymcount, asymbol **dynsyms,
- asymbol **ret, asection *plt,
- bfd_vma *(*get_plt_sym_val) (bfd *, asymbol **, asection *, asection *))
-{
- const struct elf_backend_data *bed = get_elf_backend_data (abfd);
- asection *relplt;
- asymbol *s;
- const char *relplt_name;
- bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
- arelent *p;
- long count, i, n;
- size_t size;
- Elf_Internal_Shdr *hdr;
- char *names;
- bfd_vma *plt_sym_val;
-
- *ret = NULL;
-
- if (plt == NULL)
- return 0;
-
- if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
- return 0;
-
- if (dynsymcount <= 0)
- return 0;
-
- relplt_name = bed->relplt_name;
- if (relplt_name == NULL)
- relplt_name = bed->rela_plts_and_copies_p ? ".rela.plt" : ".rel.plt";
- relplt = bfd_get_section_by_name (abfd, relplt_name);
- if (relplt == NULL)
- return 0;
-
- hdr = &elf_section_data (relplt)->this_hdr;
- if (hdr->sh_link != elf_dynsymtab (abfd)
- || (hdr->sh_type != SHT_REL && hdr->sh_type != SHT_RELA))
- return 0;
-
- slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
- if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
- return -1;
-
- count = relplt->size / hdr->sh_entsize;
- size = count * sizeof (asymbol);
- p = relplt->relocation;
- for (i = 0; i < count; i++, p += bed->s->int_rels_per_ext_rel)
- {
- size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
- if (p->addend != 0)
- {
-#ifdef BFD64
- size += sizeof ("+0x") - 1 + 8 + 8 * (bed->s->elfclass == ELFCLASS64);
-#else
- size += sizeof ("+0x") - 1 + 8;
-#endif
- }
- }
-
- plt_sym_val = get_plt_sym_val (abfd, dynsyms, plt, relplt);
- if (plt_sym_val == NULL)
- return -1;
-
- s = *ret = (asymbol *) bfd_malloc (size);
- if (s == NULL)
- {
- free (plt_sym_val);
- return -1;
- }
-
- names = (char *) (s + count);
- p = relplt->relocation;
- n = 0;
- for (i = 0; i < count; i++, p += bed->s->int_rels_per_ext_rel)
- {
- size_t len;
- bfd_vma addr;
-
- addr = plt_sym_val[i];
- if (addr == (bfd_vma) -1)
- continue;
-
- *s = **p->sym_ptr_ptr;
- /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
- we are defining a symbol, ensure one of them is set. */
- if ((s->flags & BSF_LOCAL) == 0)
- s->flags |= BSF_GLOBAL;
- s->flags |= BSF_SYNTHETIC;
- s->section = plt;
- s->value = addr - plt->vma;
- s->name = names;
- s->udata.p = NULL;
- len = strlen ((*p->sym_ptr_ptr)->name);
- memcpy (names, (*p->sym_ptr_ptr)->name, len);
- names += len;
- if (p->addend != 0)
- {
- char buf[30], *a;
-
- memcpy (names, "+0x", sizeof ("+0x") - 1);
- names += sizeof ("+0x") - 1;
- bfd_sprintf_vma (abfd, buf, p->addend);
- for (a = buf; *a == '0'; ++a)
- ;
- len = strlen (a);
- memcpy (names, a, len);
- names += len;
- }
- memcpy (names, "@plt", sizeof ("@plt"));
- names += sizeof ("@plt");
- ++s, ++n;
- }
-
- free (plt_sym_val);
-
- return n;
-}
projects / deliverable / binutils-gdb.git / blobdiff