return _bfd_elf_hash_symbol (h);
}
+static bfd_vma
+elf_i386_get_plt_got_vma (struct elf_x86_plt *plt_p ATTRIBUTE_UNUSED,
+ bfd_vma off,
+ bfd_vma offset ATTRIBUTE_UNUSED,
+ bfd_vma got_addr)
+{
+ return got_addr + off;
+}
+
+static bfd_vma
+elf_x86_64_get_plt_got_vma (struct elf_x86_plt *plt_p,
+ bfd_vma off,
+ bfd_vma offset,
+ bfd_vma got_addr ATTRIBUTE_UNUSED)
+{
+ return plt_p->sec->vma + offset + off + plt_p->plt_got_insn_size;
+}
+
+static bfd_boolean
+elf_i386_valid_plt_reloc_p (unsigned int type)
+{
+ return (type == R_386_JUMP_SLOT
+ || type == R_386_GLOB_DAT
+ || type == R_386_IRELATIVE);
+}
+
+static bfd_boolean
+elf_x86_64_valid_plt_reloc_p (unsigned int type)
+{
+ return (type == R_X86_64_JUMP_SLOT
+ || type == R_X86_64_GLOB_DAT
+ || type == R_X86_64_IRELATIVE);
+}
+
+long
+_bfd_x86_elf_get_synthetic_symtab (bfd *abfd,
+ long count,
+ long relsize,
+ bfd_vma got_addr,
+ struct elf_x86_plt plts[],
+ asymbol **dynsyms,
+ asymbol **ret)
+{
+ long size, i, n, len;
+ int j;
+ unsigned int plt_got_offset, plt_entry_size;
+ asymbol *s;
+ bfd_byte *plt_contents;
+ long dynrelcount;
+ arelent **dynrelbuf, *p;
+ char *names;
+ const struct elf_backend_data *bed;
+ bfd_vma (*get_plt_got_vma) (struct elf_x86_plt *, bfd_vma, bfd_vma,
+ bfd_vma);
+ bfd_boolean (*valid_plt_reloc_p) (unsigned int);
+
+ if (count == 0)
+ return -1;
+
+ dynrelbuf = (arelent **) bfd_malloc (relsize);
+ if (dynrelbuf == NULL)
+ return -1;
+
+ dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf,
+ dynsyms);
+
+ /* Sort the relocs by address. */
+ qsort (dynrelbuf, dynrelcount, sizeof (arelent *),
+ _bfd_x86_elf_compare_relocs);
+
+ size = count * sizeof (asymbol);
+
+ /* Allocate space for @plt suffixes. */
+ n = 0;
+ for (i = 0; i < dynrelcount; i++)
+ {
+ p = dynrelbuf[i];
+ size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
+ if (p->addend != 0)
+ size += sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd);
+ }
+
+ s = *ret = (asymbol *) bfd_zmalloc (size);
+ if (s == NULL)
+ goto bad_return;
+
+ bed = get_elf_backend_data (abfd);
+
+ if (bed->target_id == X86_64_ELF_DATA)
+ {
+ get_plt_got_vma = elf_x86_64_get_plt_got_vma;
+ valid_plt_reloc_p = elf_x86_64_valid_plt_reloc_p;
+ }
+ else
+ {
+ get_plt_got_vma = elf_i386_get_plt_got_vma;
+ valid_plt_reloc_p = elf_i386_valid_plt_reloc_p;
+ if (got_addr)
+ {
+ /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_
+ address. */
+ asection *sec = bfd_get_section_by_name (abfd, ".got.plt");
+ if (sec != NULL)
+ got_addr = sec->vma;
+ else
+ {
+ sec = bfd_get_section_by_name (abfd, ".got");
+ if (sec != NULL)
+ got_addr = sec->vma;
+ }
+
+ if (got_addr == (bfd_vma) -1)
+ goto bad_return;
+ }
+ }
+
+ /* Check for each PLT section. */
+ names = (char *) (s + count);
+ size = 0;
+ n = 0;
+ for (j = 0; plts[j].name != NULL; j++)
+ if ((plt_contents = plts[j].contents) != NULL)
+ {
+ long k;
+ bfd_vma offset;
+ asection *plt;
+ struct elf_x86_plt *plt_p = &plts[j];
+
+ plt_got_offset = plt_p->plt_got_offset;
+ plt_entry_size = plt_p->plt_entry_size;
+
+ plt = plt_p->sec;
+
+ if ((plt_p->type & plt_lazy))
+ {
+ /* Skip PLT0 in lazy PLT. */
+ k = 1;
+ offset = plt_entry_size;
+ }
+ else
+ {
+ k = 0;
+ offset = 0;
+ }
+
+ /* Check each PLT entry against dynamic relocations. */
+ for (; k < plt_p->count; k++)
+ {
+ int off;
+ bfd_vma got_vma;
+ long min, max, mid;
+
+ /* Get the GOT offset for i386 or the PC-relative offset
+ for x86-64, a signed 32-bit integer. */
+ off = H_GET_32 (abfd, (plt_contents + offset
+ + plt_got_offset));
+ got_vma = get_plt_got_vma (plt_p, off, offset, got_addr);
+
+ /* Binary search. */
+ p = dynrelbuf[0];
+ min = 0;
+ max = dynrelcount;
+ while ((min + 1) < max)
+ {
+ arelent *r;
+
+ mid = (min + max) / 2;
+ r = dynrelbuf[mid];
+ if (got_vma > r->address)
+ min = mid;
+ else if (got_vma < r->address)
+ max = mid;
+ else
+ {
+ p = r;
+ break;
+ }
+ }
+
+ /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
+ if (got_vma == p->address
+ && p->howto != NULL
+ && valid_plt_reloc_p (p->howto->type))
+ {
+ *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;
+ /* This is no longer a section symbol. */
+ s->flags &= ~BSF_SECTION_SYM;
+ s->section = plt;
+ s->the_bfd = plt->owner;
+ s->value = offset;
+ s->udata.p = NULL;
+ s->name = names;
+ 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)
+ ;
+ size = strlen (a);
+ memcpy (names, a, size);
+ names += size;
+ }
+ memcpy (names, "@plt", sizeof ("@plt"));
+ names += sizeof ("@plt");
+ n++;
+ s++;
+ }
+ offset += plt_entry_size;
+ }
+ }
+
+ /* PLT entries with R_386_TLS_DESC relocations are skipped. */
+ if (n == 0)
+ {
+bad_return:
+ count = -1;
+ }
+ else
+ count = n;
+
+ for (j = 0; plts[j].name != NULL; j++)
+ if (plts[j].contents != NULL)
+ free (plts[j].contents);
+
+ free (dynrelbuf);
+
+ return count;
+}
+
/* Parse x86 GNU properties. */
enum elf_property_kind
projects / deliverable / binutils-gdb.git / blobdiff