/* X86-64 specific support for 64-bit ELF
- Copyright 2000 Free Software Foundation, Inc.
+ Copyright 2000, 2001 Free Software Foundation, Inc.
Contributed by Jan Hubicka <jh@suse.cz>.
This file is part of BFD, the Binary File Descriptor library.
/* The relocation "howto" table. Order of fields:
type, size, bitsize, pc_relative, complain_on_overflow, special_function,
name, partial_inplace, src_mask, dst_pack, pcrel_offset */
-static reloc_howto_type x86_64_elf_howto_table[] = {
+static reloc_howto_type x86_64_elf_howto_table[] =
+{
HOWTO(R_X86_64_NONE, 0,0, 0,false,0,complain_overflow_dont, 0, "R_X86_64_NONE", false,0x00000000,0x00000000,false),
HOWTO(R_X86_64_64, 0,4,64,false,0,complain_overflow_bitfield,0, "R_X86_64_64", false,MINUS_ONE ,MINUS_ONE ,false),
HOWTO(R_X86_64_PC32, 0,4,32,true ,0,complain_overflow_signed ,0, "R_X86_64_PC32", false,0xffffffff,0xffffffff,true),
};
/* Map BFD relocs to the x86_64 elf relocs. */
-struct elf_reloc_map {
+struct elf_reloc_map
+{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned char elf_reloc_val;
};
static CONST struct elf_reloc_map x86_64_reloc_map[] =
{
- { BFD_RELOC_NONE, R_X86_64_NONE, },
- { BFD_RELOC_64, R_X86_64_64, },
- { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
- { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
- { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
- { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
- { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
- { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
- { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
- { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
- { BFD_RELOC_32, R_X86_64_32, },
- { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
- { BFD_RELOC_16, R_X86_64_16, },
- { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
- { BFD_RELOC_8, R_X86_64_8, },
- { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
+ { BFD_RELOC_NONE, R_X86_64_NONE, },
+ { BFD_RELOC_64, R_X86_64_64, },
+ { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
+ { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
+ { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
+ { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
+ { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
+ { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
+ { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
+ { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
+ { BFD_RELOC_32, R_X86_64_32, },
+ { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
+ { BFD_RELOC_16, R_X86_64_16, },
+ { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
+ { BFD_RELOC_8, R_X86_64_8, },
+ { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
};
static reloc_howto_type *elf64_x86_64_reloc_type_lookup
PARAMS ((bfd *, arelent *, Elf64_Internal_Rela *));
static struct bfd_link_hash_table *elf64_x86_64_link_hash_table_create
PARAMS ((bfd *));
+
+static struct bfd_hash_entry *elf64_x86_64_link_hash_newfunc
+ PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
+static boolean elf64_x86_64_adjust_dynamic_symbol
+ PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
+
+static boolean elf64_x86_64_size_dynamic_sections
+ PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf64_x86_64_relocate_section
PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
+static boolean elf64_x86_64_finish_dynamic_symbol
+ PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
+ Elf_Internal_Sym *sym));
+static boolean elf64_x86_64_finish_dynamic_sections
+ PARAMS ((bfd *, struct bfd_link_info *));
/* Given a BFD reloc type, return a HOWTO structure. */
static reloc_howto_type *
cache_ptr->howto = &x86_64_elf_howto_table[r_type];
BFD_ASSERT (r_type == cache_ptr->howto->type);
}
+\f
+/* Functions for the x86-64 ELF linker. */
+
+/* The name of the dynamic interpreter. This is put in the .interp
+ section. */
+
+#define ELF_DYNAMIC_INTERPRETER "/lib/libd64.so.1"
+
+/* The size in bytes of an entry in the global offset table. */
+
+#define GOT_ENTRY_SIZE 8
-/* Hash table functions - these will be used by dynamic linking code and
- right now they are needed to keep ld happy. */
+/* The size in bytes of an entry in the procedure linkage table. */
-/* x86_64 ELF linker hash table. */
+#define PLT_ENTRY_SIZE 16
+
+/* The first entry in a procedure linkage table looks like this. See the
+ SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
+
+static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
+{
+ 0xff, 0xb3, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
+ 0xff, 0xa3, 16, 0, 0, 0, /* jmp GOT+16(%rip) */
+ 0, 0, 0, 0 /* pad out to 16 bytes. */
+};
+
+/* Subsequent entries in a procedure linkage table look like this. */
+
+static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
+{
+ 0xff, 0xa3, /* jmp *name@GOTPC(%rip) */
+ 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
+ 0x68, /* pushq immediate */
+ 0, 0, 0, 0, /* replaced with index into relocation table. */
+ 0xe9, /* jmp relative */
+ 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
+};
+
+/* The x86-64 linker needs to keep track of the number of relocs that
+ it decides to copy in check_relocs for each symbol. This is so
+ that it can discard PC relative relocs if it doesn't need them when
+ linking with -Bsymbolic. We store the information in a field
+ extending the regular ELF linker hash table. */
+
+/* This structure keeps track of the number of PC relative relocs we
+ have copied for a given symbol. */
+
+struct elf64_x86_64_pcrel_relocs_copied
+{
+ /* Next section. */
+ struct elf64_x86_64_pcrel_relocs_copied *next;
+ /* A section in dynobj. */
+ asection *section;
+ /* Number of relocs copied in this section. */
+ bfd_size_type count;
+};
+
+/* x86-64 ELF linker hash entry. */
+
+struct elf64_x86_64_link_hash_entry
+{
+ struct elf_link_hash_entry root;
+
+ /* Number of PC relative relocs copied for this symbol. */
+ struct elf64_x86_64_pcrel_relocs_copied *pcrel_relocs_copied;
+};
+
+/* x86-64 ELF linker hash table. */
struct elf64_x86_64_link_hash_table {
struct elf_link_hash_table root;
};
-/* Get the X86-64 ELF linker hash table from a link_info structure. */
+/* Declare this now that the above structures are defined. */
+
+static boolean elf64_x86_64_discard_copies
+ PARAMS ((struct elf64_x86_64_link_hash_entry *, PTR));
+
+/* Traverse an x86-64 ELF linker hash table. */
+
+#define elf64_x86_64_link_hash_traverse(table, func, info) \
+ (elf_link_hash_traverse \
+ (&(table)->root, \
+ (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
+ (info)))
+
+/* Get the x86-64 ELF linker hash table from a link_info structure. */
#define elf64_x86_64_hash_table(p) \
((struct elf64_x86_64_link_hash_table *) ((p)->hash))
+/* Create an entry in an x86-64 ELF linker hash table. */
+
+static struct bfd_hash_entry *
+elf64_x86_64_link_hash_newfunc (entry, table, string)
+ struct bfd_hash_entry *entry;
+ struct bfd_hash_table *table;
+ const char *string;
+{
+ struct elf64_x86_64_link_hash_entry *ret =
+ (struct elf64_x86_64_link_hash_entry *) entry;
+
+ /* Allocate the structure if it has not already been allocated by a
+ subclass. */
+ if (ret == (struct elf64_x86_64_link_hash_entry *) NULL)
+ ret = ((struct elf64_x86_64_link_hash_entry *)
+ bfd_hash_allocate (table,
+ sizeof (struct elf64_x86_64_link_hash_entry)));
+ if (ret == (struct elf64_x86_64_link_hash_entry *) NULL)
+ return (struct bfd_hash_entry *) ret;
+
+ /* Call the allocation method of the superclass. */
+ ret = ((struct elf64_x86_64_link_hash_entry *)
+ _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
+ table, string));
+ if (ret != (struct elf64_x86_64_link_hash_entry *) NULL)
+ {
+ ret->pcrel_relocs_copied = NULL;
+ }
+
+ return (struct bfd_hash_entry *) ret;
+}
+
/* Create an X86-64 ELF linker hash table. */
static struct bfd_link_hash_table *
return NULL;
if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
- _bfd_elf_link_hash_newfunc))
+ elf64_x86_64_link_hash_newfunc))
{
bfd_release (abfd, ret);
return NULL;
return true;
}
+/* Look through the relocs for a section during the first phase, and
+ allocate space in the global offset table or procedure linkage
+ table. */
+
+static boolean
+elf64_x86_64_check_relocs (abfd, info, sec, relocs)
+ bfd *abfd;
+ struct bfd_link_info *info;
+ asection *sec;
+ const Elf_Internal_Rela *relocs;
+{
+ bfd *dynobj;
+ Elf_Internal_Shdr *symtab_hdr;
+ struct elf_link_hash_entry **sym_hashes;
+ bfd_signed_vma *local_got_refcounts;
+ const Elf_Internal_Rela *rel;
+ const Elf_Internal_Rela *rel_end;
+ asection *sgot;
+ asection *srelgot;
+ asection *sreloc;
+
+ if (info->relocateable)
+ return true;
+
+ dynobj = elf_hash_table (info)->dynobj;
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (abfd);
+ local_got_refcounts = elf_local_got_refcounts (abfd);
+
+ sgot = srelgot = sreloc = NULL;
+ rel_end = relocs + sec->reloc_count;
+ for (rel = relocs; rel < rel_end; rel++)
+ {
+ unsigned long r_symndx;
+ struct elf_link_hash_entry *h;
+
+ r_symndx = ELF64_R_SYM (rel->r_info);
+ if (r_symndx < symtab_hdr->sh_info)
+ h = NULL;
+ else
+ h = sym_hashes[r_symndx - symtab_hdr->sh_info];
+
+ /* Some relocs require a global offset table. */
+ if (dynobj == NULL)
+ {
+ switch (ELF64_R_TYPE (rel->r_info))
+ {
+ case R_X86_64_GOT32:
+ case R_X86_64_GOTPCREL:
+ elf_hash_table (info)->dynobj = dynobj = abfd;
+ if (! _bfd_elf_create_got_section (dynobj, info))
+ return false;
+ break;
+ }
+ }
+
+ switch (ELF64_R_TYPE (rel->r_info))
+ {
+ case R_X86_64_GOT32:
+ /* This symbol requires a global offset table entry. */
+
+ if (sgot == NULL)
+ {
+ sgot = bfd_get_section_by_name (dynobj, ".got");
+ BFD_ASSERT (sgot != NULL);
+ }
+
+ if (srelgot == NULL && (h != NULL || info->shared))
+ {
+ srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
+ if (srelgot == NULL)
+ {
+ srelgot = bfd_make_section (dynobj, ".rela.got");
+ if (srelgot == NULL
+ || ! bfd_set_section_flags (dynobj, srelgot,
+ (SEC_ALLOC
+ | SEC_LOAD
+ | SEC_HAS_CONTENTS
+ | SEC_IN_MEMORY
+ | SEC_LINKER_CREATED
+ | SEC_READONLY))
+ || ! bfd_set_section_alignment (dynobj, srelgot, 2))
+ return false;
+ }
+ }
+
+ if (h != NULL)
+ {
+ if (h->got.refcount == -1)
+ {
+ h->got.refcount = 1;
+
+ /* Make sure this symbol is output as a dynamic symbol. */
+ if (h->dynindx == -1)
+ {
+ if (! bfd_elf64_link_record_dynamic_symbol (info, h))
+ return false;
+ }
+
+ sgot->_raw_size += GOT_ENTRY_SIZE;
+ srelgot->_raw_size += sizeof (Elf64_External_Rela);
+ }
+ else
+ h->got.refcount += 1;
+ }
+ else
+ {
+ /* This is a global offset table entry for a local symbol. */
+ if (local_got_refcounts == NULL)
+ {
+ size_t size;
+
+ size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
+ local_got_refcounts = ((bfd_signed_vma *)
+ bfd_alloc (abfd, size));
+ if (local_got_refcounts == NULL)
+ return false;
+ elf_local_got_refcounts (abfd) = local_got_refcounts;
+ memset (local_got_refcounts, -1, size);
+ }
+ if (local_got_refcounts[r_symndx] == -1)
+ {
+ local_got_refcounts[r_symndx] = 1;
+
+ sgot->_raw_size += GOT_ENTRY_SIZE;
+ if (info->shared)
+ {
+ /* If we are generating a shared object, we need to
+ output a R_X86_64_RELATIVE reloc so that the dynamic
+ linker can adjust this GOT entry. */
+ srelgot->_raw_size += sizeof (Elf64_External_Rela);
+ }
+ }
+ else
+ local_got_refcounts[r_symndx] += 1;
+ }
+ break;
+
+ case R_X86_64_PLT32:
+ /* This symbol requires a procedure linkage table entry. We
+ actually build the entry in adjust_dynamic_symbol,
+ because this might be a case of linking PIC code which is
+ never referenced by a dynamic object, in which case we
+ don't need to generate a procedure linkage table entry
+ after all. */
+
+ /* If this is a local symbol, we resolve it directly without
+ creating a procedure linkage table entry. */
+ if (h == NULL)
+ continue;
+
+ if (h->plt.refcount == -1)
+ {
+ h->plt.refcount = 1;
+ h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
+ }
+ else
+ h->plt.refcount += 1;
+ break;
+
+ case R_X86_64_32:
+ case R_X86_64_32S:
+ case R_X86_64_PC32:
+ if (h != NULL)
+ h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
+
+ /* If we are creating a shared library, and this is a reloc
+ against a global symbol, or a non PC relative reloc
+ against a local symbol, then we need to copy the reloc
+ into the shared library. However, if we are linking with
+ -Bsymbolic, we do not need to copy a reloc against a
+ global symbol which is defined in an object we are
+ including in the link (i.e., DEF_REGULAR is set). At
+ this point we have not seen all the input files, so it is
+ possible that DEF_REGULAR is not set now but will be set
+ later (it is never cleared). We account for that
+ possibility below by storing information in the
+ pcrel_relocs_copied field of the hash table entry.
+ A similar situation occurs when creating shared libraries
+ and symbol visibility changes render the symbol local. */
+ if (info->shared
+ && (sec->flags & SEC_ALLOC) != 0
+ && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC32
+ || (h != NULL
+ && (! info->symbolic
+ || (h->elf_link_hash_flags
+ & ELF_LINK_HASH_DEF_REGULAR) == 0))))
+ {
+ /* When creating a shared object, we must copy these
+ reloc types into the output file. We create a reloc
+ section in dynobj and make room for this reloc. */
+ if (sreloc == NULL)
+ {
+ const char *name;
+
+ name = (bfd_elf_string_from_elf_section
+ (abfd,
+ elf_elfheader (abfd)->e_shstrndx,
+ elf_section_data (sec)->rel_hdr.sh_name));
+ if (name == NULL)
+ return false;
+
+ BFD_ASSERT (strncmp (name, ".rela", 5) == 0
+ && strcmp (bfd_get_section_name (abfd, sec),
+ name + 5) == 0);
+
+ sreloc = bfd_get_section_by_name (dynobj, name);
+ if (sreloc == NULL)
+ {
+ flagword flags;
+
+ sreloc = bfd_make_section (dynobj, name);
+ flags = (SEC_HAS_CONTENTS | SEC_READONLY
+ | SEC_IN_MEMORY | SEC_LINKER_CREATED);
+ if ((sec->flags & SEC_ALLOC) != 0)
+ flags |= SEC_ALLOC | SEC_LOAD;
+ if (sreloc == NULL
+ || ! bfd_set_section_flags (dynobj, sreloc, flags)
+ || ! bfd_set_section_alignment (dynobj, sreloc, 2))
+ return false;
+ }
+ }
+
+ sreloc->_raw_size += sizeof (Elf64_External_Rela);
+
+ /* If this is a global symbol, we count the number of PC
+ relative relocations we have entered for this symbol,
+ so that we can discard them later as necessary. Note
+ that this function is only called if we are using an
+ elf64_x86_64 linker hash table, which means that h is
+ really a pointer to an elf64_x86_64_link_hash_entry. */
+ if (h != NULL
+ && ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32)
+ {
+ struct elf64_x86_64_link_hash_entry *eh;
+ struct elf64_x86_64_pcrel_relocs_copied *p;
+
+ eh = (struct elf64_x86_64_link_hash_entry *) h;
+
+ for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
+ if (p->section == sreloc)
+ break;
+
+ if (p == NULL)
+ {
+ p = ((struct elf64_x86_64_pcrel_relocs_copied *)
+ bfd_alloc (dynobj, sizeof *p));
+ if (p == NULL)
+ return false;
+ p->next = eh->pcrel_relocs_copied;
+ eh->pcrel_relocs_copied = p;
+ p->section = sreloc;
+ p->count = 0;
+ }
+
+ ++p->count;
+ }
+ }
+ break;
+ }
+ }
+
+ return true;
+}
+
+/* Return the section that should be marked against GC for a given
+ relocation. */
+
+static asection *
+elf64_x86_64_gc_mark_hook (abfd, info, rel, h, sym)
+ bfd *abfd;
+ struct bfd_link_info *info ATTRIBUTE_UNUSED;
+ Elf_Internal_Rela *rel ATTRIBUTE_UNUSED;
+ struct elf_link_hash_entry *h;
+ Elf_Internal_Sym *sym;
+{
+ if (h != NULL)
+ {
+ switch (h->root.type)
+ {
+ case bfd_link_hash_defined:
+ case bfd_link_hash_defweak:
+ return h->root.u.def.section;
+
+ case bfd_link_hash_common:
+ return h->root.u.c.p->section;
+
+ default:
+ break;
+ }
+ }
+ else
+ {
+ if (!(elf_bad_symtab (abfd)
+ && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
+ && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
+ && sym->st_shndx != SHN_COMMON))
+ {
+ return bfd_section_from_elf_index (abfd, sym->st_shndx);
+ }
+ }
+
+ return NULL;
+}
+
+/* Update the got entry reference counts for the section being removed. */
+
+static boolean
+elf64_x86_64_gc_sweep_hook (abfd, info, sec, relocs)
+ bfd *abfd;
+ struct bfd_link_info *info ATTRIBUTE_UNUSED;
+ asection *sec;
+ const Elf_Internal_Rela *relocs;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ struct elf_link_hash_entry **sym_hashes;
+ bfd_signed_vma *local_got_refcounts;
+ const Elf_Internal_Rela *rel, *relend;
+ unsigned long r_symndx;
+ struct elf_link_hash_entry *h;
+ bfd *dynobj;
+ asection *sgot;
+ asection *srelgot;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (abfd);
+ local_got_refcounts = elf_local_got_refcounts (abfd);
+
+ dynobj = elf_hash_table (info)->dynobj;
+ if (dynobj == NULL)
+ return true;
+
+ sgot = bfd_get_section_by_name (dynobj, ".got");
+ srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
+
+ relend = relocs + sec->reloc_count;
+ for (rel = relocs; rel < relend; rel++)
+ switch (ELF64_R_TYPE (rel->r_info))
+ {
+ case R_X86_64_GOT32:
+ case R_X86_64_GOTPCREL:
+ r_symndx = ELF64_R_SYM (rel->r_info);
+ if (r_symndx >= symtab_hdr->sh_info)
+ {
+ h = sym_hashes[r_symndx - symtab_hdr->sh_info];
+ if (h->got.refcount > 0)
+ {
+ h->got.refcount -= 1;
+ if (h->got.refcount == 0)
+ {
+ sgot->_raw_size -= GOT_ENTRY_SIZE;
+ srelgot->_raw_size -= sizeof (Elf64_External_Rela);
+ }
+ }
+ }
+ else if (local_got_refcounts != NULL)
+ {
+ if (local_got_refcounts[r_symndx] > 0)
+ {
+ local_got_refcounts[r_symndx] -= 1;
+ if (local_got_refcounts[r_symndx] == 0)
+ {
+ sgot->_raw_size -= GOT_ENTRY_SIZE;
+ if (info->shared)
+ srelgot->_raw_size -= sizeof (Elf64_External_Rela);
+ }
+ }
+ }
+ break;
+
+ case R_X86_64_PLT32:
+ r_symndx = ELF64_R_SYM (rel->r_info);
+ if (r_symndx >= symtab_hdr->sh_info)
+ {
+ h = sym_hashes[r_symndx - symtab_hdr->sh_info];
+ if (h->plt.refcount > 0)
+ h->plt.refcount -= 1;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return true;
+}
+
+/* Adjust a symbol defined by a dynamic object and referenced by a
+ regular object. The current definition is in some section of the
+ dynamic object, but we're not including those sections. We have to
+ change the definition to something the rest of the link can
+ understand. */
+
+static boolean
+elf64_x86_64_adjust_dynamic_symbol (info, h)
+ struct bfd_link_info *info;
+ struct elf_link_hash_entry *h;
+{
+ bfd *dynobj;
+ asection *s;
+ unsigned int power_of_two;
+
+ dynobj = elf_hash_table (info)->dynobj;
+
+ /* Make sure we know what is going on here. */
+ BFD_ASSERT (dynobj != NULL
+ && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
+ || h->weakdef != NULL
+ || ((h->elf_link_hash_flags
+ & ELF_LINK_HASH_DEF_DYNAMIC) != 0
+ && (h->elf_link_hash_flags
+ & ELF_LINK_HASH_REF_REGULAR) != 0
+ && (h->elf_link_hash_flags
+ & ELF_LINK_HASH_DEF_REGULAR) == 0)));
+
+ /* If this is a function, put it in the procedure linkage table. We
+ will fill in the contents of the procedure linkage table later,
+ when we know the address of the .got section. */
+ if (h->type == STT_FUNC
+ || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
+ {
+ if (! elf_hash_table (info)->dynamic_sections_created)
+ {
+ /* FIXME: These are the sparc64 comment and then the i386 comment.
+ How we need to deal with this and why remains to be seen. */
+ /* This case can occur if we saw a WPLT30 reloc in an input
+ file, but none of the input files were dynamic objects.
+ In such a case, we don't actually need to build a
+ procedure linkage table, and we can just do a WDISP30
+ reloc instead. */
+ /* This case can occur if we saw a PLT32 reloc in an input
+ file, but the symbol was never referred to by a dynamic
+ object, or if all references were garbage collected. In
+ such a case, we don't actually need to build a procedure
+ linkage table, and we can just do a PC32 reloc instead. */
+ /* i386 code: */
+ h->plt.offset = (bfd_vma) -1;
+ h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
+ return true;
+ }
+
+ /* Make sure this symbol is output as a dynamic symbol. */
+ if (h->dynindx == -1)
+ {
+ if (! bfd_elf64_link_record_dynamic_symbol (info, h))
+ return false;
+ }
+
+ s = bfd_get_section_by_name (dynobj, ".plt");
+ BFD_ASSERT (s != NULL);
+
+ /* If this is the first .plt entry, make room for the special
+ first entry. */
+ if (s->_raw_size == 0)
+ s->_raw_size = PLT_ENTRY_SIZE;
+
+ /* If this symbol is not defined in a regular file, and we are
+ not generating a shared library, then set the symbol to this
+ location in the .plt. This is required to make function
+ pointers compare as equal between the normal executable and
+ the shared library. */
+ if (! info->shared
+ && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
+ {
+ h->root.u.def.section = s;
+ h->root.u.def.value = s->_raw_size;
+ }
+
+ h->plt.offset = s->_raw_size;
+
+ /* Make room for this entry. */
+ s->_raw_size += PLT_ENTRY_SIZE;
+
+ /* We also need to make an entry in the .rela.plt section. */
+ s = bfd_get_section_by_name (dynobj, ".rela.plt");
+ BFD_ASSERT (s != NULL);
+ s->_raw_size += sizeof (Elf64_External_Rela);
+
+ return true;
+ }
+
+ /* If this is a weak symbol, and there is a real definition, the
+ processor independent code will have arranged for us to see the
+ real definition first, and we can just use the same value. */
+ if (h->weakdef != NULL)
+ {
+ BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
+ || h->weakdef->root.type == bfd_link_hash_defweak);
+ h->root.u.def.section = h->weakdef->root.u.def.section;
+ h->root.u.def.value = h->weakdef->root.u.def.value;
+ return true;
+ }
+
+ /* This is a reference to a symbol defined by a dynamic object which
+ is not a function. */
+
+ /* If we are creating a shared library, we must presume that the
+ only references to the symbol are via the global offset table.
+ For such cases we need not do anything here; the relocations will
+ be handled correctly by relocate_section. */
+ if (info->shared)
+ return true;
+
+ /* If there are no references to this symbol that do not use the
+ GOT, we don't need to generate a copy reloc. */
+ if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
+ return true;
+
+ /* We must allocate the symbol in our .dynbss section, which will
+ become part of the .bss section of the executable. There will be
+ an entry for this symbol in the .dynsym section. The dynamic
+ object will contain position independent code, so all references
+ from the dynamic object to this symbol will go through the global
+ offset table. The dynamic linker will use the .dynsym entry to
+ determine the address it must put in the global offset table, so
+ both the dynamic object and the regular object will refer to the
+ same memory location for the variable. */
+
+ s = bfd_get_section_by_name (dynobj, ".dynbss");
+ BFD_ASSERT (s != NULL);
+
+ /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
+ to copy the initial value out of the dynamic object and into the
+ runtime process image. We need to remember the offset into the
+ .rela.bss section we are going to use. */
+ if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
+ {
+ asection *srel;
+
+ srel = bfd_get_section_by_name (dynobj, ".rela.bss");
+ BFD_ASSERT (srel != NULL);
+ srel->_raw_size += sizeof (Elf64_External_Rela);
+ h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
+ }
+
+ /* We need to figure out the alignment required for this symbol. I
+ have no idea how ELF linkers handle this. 16-bytes is the size
+ of the largest type that requires hard alignment -- long double. */
+ /* FIXME: This is VERY ugly. Should be fixed for all architectures using
+ this construct. */
+ power_of_two = bfd_log2 (h->size);
+ if (power_of_two > 4)
+ power_of_two = 4;
+
+ /* Apply the required alignment. */
+ s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
+ if (power_of_two > bfd_get_section_alignment (dynobj, s))
+ {
+ if (! bfd_set_section_alignment (dynobj, s, power_of_two))
+ return false;
+ }
+
+ /* Define the symbol as being at this point in the section. */
+ h->root.u.def.section = s;
+ h->root.u.def.value = s->_raw_size;
+
+ /* Increment the section size to make room for the symbol. */
+ s->_raw_size += h->size;
+
+ return true;
+}
+
+/* Set the sizes of the dynamic sections. */
+
+static boolean
+elf64_x86_64_size_dynamic_sections (output_bfd, info)
+ bfd *output_bfd;
+ struct bfd_link_info *info;
+{
+ bfd *dynobj;
+ asection *s;
+ boolean plt;
+ boolean relocs;
+ boolean reltext;
+
+ dynobj = elf_hash_table (info)->dynobj;
+ BFD_ASSERT (dynobj != NULL);
+
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ /* Set the contents of the .interp section to the interpreter. */
+ if (! info->shared)
+ {
+ s = bfd_get_section_by_name (dynobj, ".interp");
+ BFD_ASSERT (s != NULL);
+ s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
+ s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
+ }
+ }
+ else
+ {
+ /* We may have created entries in the .rela.got section.
+ However, if we are not creating the dynamic sections, we will
+ not actually use these entries. Reset the size of .rela.got,
+ which will cause it to get stripped from the output file
+ below. */
+ s = bfd_get_section_by_name (dynobj, ".rela.got");
+ if (s != NULL)
+ s->_raw_size = 0;
+ }
+
+ /* If this is a -Bsymbolic shared link, then we need to discard all
+ PC relative relocs against symbols defined in a regular object.
+ We allocated space for them in the check_relocs routine, but we
+ will not fill them in in the relocate_section routine. */
+ if (info->shared)
+ elf64_x86_64_link_hash_traverse (elf64_x86_64_hash_table (info),
+ elf64_x86_64_discard_copies,
+ (PTR) info);
+
+ /* The check_relocs and adjust_dynamic_symbol entry points have
+ determined the sizes of the various dynamic sections. Allocate
+ memory for them. */
+ plt = relocs = reltext = false;
+ for (s = dynobj->sections; s != NULL; s = s->next)
+ {
+ const char *name;
+ boolean strip;
+
+ if ((s->flags & SEC_LINKER_CREATED) == 0)
+ continue;
+
+ /* It's OK to base decisions on the section name, because none
+ of the dynobj section names depend upon the input files. */
+ name = bfd_get_section_name (dynobj, s);
+
+ strip = false;
+ if (strcmp (name, ".plt") == 0)
+ {
+ if (s->_raw_size == 0)
+ {
+ /* Strip this section if we don't need it; see the
+ comment below. */
+ strip = true;
+ }
+ else
+ {
+ /* Remember whether there is a PLT. */
+ plt = true;
+ }
+ }
+ else if (strncmp (name, ".rela", 5) == 0)
+ {
+ if (s->_raw_size == 0)
+ {
+ /* If we don't need this section, strip it from the
+ output file. This is mostly to handle .rela.bss and
+ .rela.plt. We must create both sections in
+ create_dynamic_sections, because they must be created
+ before the linker maps input sections to output
+ sections. The linker does that before
+ adjust_dynamic_symbol is called, and it is that
+ function which decides whether anything needs to go
+ into these sections. */
+ strip = true;
+ }
+ else
+ {
+ asection *target;
+
+ /* Remember whether there are any reloc sections other
+ than .rela.plt. */
+ if (strcmp (name, ".rela.plt") != 0)
+ {
+ const char *outname;
+
+ relocs = true;
+
+ /* If this relocation section applies to a read only
+ section, then we probably need a DT_TEXTREL
+ entry. The entries in the .rela.plt section
+ really apply to the .got section, which we
+ created ourselves and so know is not readonly. */
+ outname = bfd_get_section_name (output_bfd,
+ s->output_section);
+ target = bfd_get_section_by_name (output_bfd, outname + 5);
+ if (target != NULL
+ && (target->flags & SEC_READONLY) != 0
+ && (target->flags & SEC_ALLOC) != 0)
+ reltext = true;
+ }
+
+ /* We use the reloc_count field as a counter if we need
+ to copy relocs into the output file. */
+ s->reloc_count = 0;
+ }
+ }
+ else if (strncmp (name, ".got", 4) != 0)
+ {
+ /* It's not one of our sections, so don't allocate space. */
+ continue;
+ }
+
+ if (strip)
+ {
+ _bfd_strip_section_from_output (info, s);
+ continue;
+ }
+
+ /* Allocate memory for the section contents. We use bfd_zalloc
+ here in case unused entries are not reclaimed before the
+ section's contents are written out. This should not happen,
+ but this way if it does, we get a R_X86_64_NONE reloc instead
+ of garbage. */
+ s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
+ if (s->contents == NULL && s->_raw_size != 0)
+ return false;
+ }
+
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ /* Add some entries to the .dynamic section. We fill in the
+ values later, in elf64_x86_64_finish_dynamic_sections, but we
+ must add the entries now so that we get the correct size for
+ the .dynamic section. The DT_DEBUG entry is filled in by the
+ dynamic linker and used by the debugger. */
+ if (! info->shared)
+ {
+ if (! bfd_elf64_add_dynamic_entry (info, DT_DEBUG, 0))
+ return false;
+ }
+
+ if (plt)
+ {
+ /* FIXME: Are all these needed? */
+ if (! bfd_elf64_add_dynamic_entry (info, DT_PLTGOT, 0)
+ || ! bfd_elf64_add_dynamic_entry (info, DT_PLTRELSZ, 0)
+ || ! bfd_elf64_add_dynamic_entry (info, DT_PLTREL, DT_REL)
+ || ! bfd_elf64_add_dynamic_entry (info, DT_JMPREL, 0))
+ return false;
+ }
+
+ if (relocs)
+ {
+ if (! bfd_elf64_add_dynamic_entry (info, DT_RELA, 0)
+ || ! bfd_elf64_add_dynamic_entry (info, DT_RELASZ, 0)
+ || ! bfd_elf64_add_dynamic_entry (info, DT_RELAENT,
+ sizeof (Elf64_External_Rela)))
+ return false;
+ }
+
+ if (reltext)
+ {
+ if (! bfd_elf64_add_dynamic_entry (info, DT_TEXTREL, 0))
+ return false;
+ info->flags |= DF_TEXTREL;
+ }
+ }
+
+ return true;
+}
+
+/* This function is called via elf64_x86_64_link_hash_traverse if we are
+ creating a shared object. In the -Bsymbolic case, it discards the
+ space allocated to copy PC relative relocs against symbols which
+ are defined in regular objects. For the normal non-symbolic case,
+ we also discard space for relocs that have become local due to
+ symbol visibility changes. We allocated space for them in the
+ check_relocs routine, but we won't fill them in in the
+ relocate_section routine. */
+
+static boolean
+elf64_x86_64_discard_copies (h, inf)
+ struct elf64_x86_64_link_hash_entry *h;
+ PTR inf;
+{
+ struct elf64_x86_64_pcrel_relocs_copied *s;
+ struct bfd_link_info *info = (struct bfd_link_info *) inf;
+
+ /* If a symbol has been forced local or we have found a regular
+ definition for the symbolic link case, then we won't be needing
+ any relocs. */
+ if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
+ && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
+ || info->symbolic))
+ {
+ for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
+ s->section->_raw_size -= s->count * sizeof (Elf64_External_Rela);
+ }
+
+ return true;
+}
+
/* Relocate an x86_64 ELF section. */
static boolean
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
bfd_vma *local_got_offsets;
+ asection *sgot;
+ asection *splt;
asection *sreloc;
- Elf_Internal_Rela *rel;
+ Elf_Internal_Rela *rela;
Elf_Internal_Rela *relend;
dynobj = elf_hash_table (info)->dynobj;
sym_hashes = elf_sym_hashes (input_bfd);
local_got_offsets = elf_local_got_offsets (input_bfd);
- sreloc = NULL;
+ sreloc = splt = sgot = NULL;
if (dynobj != NULL)
- abort ();
+ {
+ splt = bfd_get_section_by_name (dynobj, ".plt");
+ sgot = bfd_get_section_by_name (dynobj, ".got");
+ }
- rel = relocs;
+ rela = relocs;
relend = relocs + input_section->reloc_count;
- for (; rel < relend; rel++)
+ for (; rela < relend; rela++)
{
int r_type;
reloc_howto_type *howto;
bfd_reloc_status_type r;
unsigned int indx;
- r_type = ELF64_R_TYPE (rel->r_info);
+ r_type = ELF64_R_TYPE (rela->r_info);
if ((indx = (unsigned) r_type) >= R_X86_64_max)
{
}
howto = x86_64_elf_howto_table + indx;
- r_symndx = ELF64_R_SYM (rel->r_info);
+ r_symndx = ELF64_R_SYM (rela->r_info);
if (info->relocateable)
{
if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
{
sec = local_sections[r_symndx];
- rel->r_addend += sec->output_offset + sym->st_value;
+ rela->r_addend += sec->output_offset + sym->st_value;
}
}
}
else if (h->root.type == bfd_link_hash_undefweak)
relocation = 0;
+ else if (info->shared && !info->symbolic && !info->no_undefined
+ && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
+ relocation = 0;
else
{
if (! ((*info->callbacks->undefined_symbol)
(info, h->root.root.string, input_bfd,
- input_section, rel->r_offset,
+ input_section, rela->r_offset,
(!info->shared || info->no_undefined
|| ELF_ST_VISIBILITY (h->other)))))
return false;
relocation = 0;
}
}
- /* This function should support shared objects, but don't. */
+
+ /* When generating a shared object, the relocations handled here are
+ copied into the output file to be resolved at run time. */
+ switch (r_type)
+ {
+ case R_X86_64_GOT32:
+ /* Relocation is to the entry for this symbol in the global
+ offset table. */
+ BFD_ASSERT (sgot != NULL);
+
+ if (h != NULL)
+ {
+ bfd_vma off = h->got.offset;
+ BFD_ASSERT (off != (bfd_vma) -1);
+
+ if (! elf_hash_table (info)->dynamic_sections_created
+ || (info->shared
+ && (info->symbolic || h->dynindx == -1)
+ && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
+ {
+ /* This is actually a static link, or it is a -Bsymbolic
+ link and the symbol is defined locally, or the symbol
+ was forced to be local because of a version file. We
+ must initialize this entry in the global offset table.
+ Since the offset must always be a multiple of 8, we
+ use the least significant bit to record whether we
+ have initialized it already.
+
+ When doing a dynamic link, we create a .rela.got
+ relocation entry to initialize the value. This is
+ done in the finish_dynamic_symbol routine. */
+ if ((off & 1) != 0)
+ off &= ~1;
+ else
+ {
+ bfd_put_64 (output_bfd, relocation,
+ sgot->contents + off);
+ h->got.offset |= 1;
+ }
+ }
+ relocation = sgot->output_offset + off;
+ }
+ else
+ {
+ bfd_vma off;
+
+ BFD_ASSERT (local_got_offsets != NULL
+ && local_got_offsets[r_symndx] != (bfd_vma) -1);
+
+ off = local_got_offsets[r_symndx];
+
+ /* The offset must always be a multiple of 8. We use
+ the least significant bit to record whether we have
+ already generated the necessary reloc. */
+ if ((off & 1) != 0)
+ off &= ~1;
+ else
+ {
+ bfd_put_64 (output_bfd, relocation, sgot->contents + off);
+
if (info->shared)
- abort ();
+ {
+ asection *srelgot;
+ Elf_Internal_Rela outrel;
+
+ /* We need to generate a R_X86_64_RELATIVE reloc
+ for the dynamic linker. */
+ srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
+ BFD_ASSERT (srelgot != NULL);
+
+ outrel.r_offset = (sgot->output_section->vma
+ + sgot->output_offset
+ + off);
+ outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
+ outrel.r_addend = relocation;
+ bfd_elf64_swap_reloca_out (output_bfd, &outrel,
+ (((Elf64_External_Rela *)
+ srelgot->contents)
+ + srelgot->reloc_count));
+ ++srelgot->reloc_count;
+ }
+
+ local_got_offsets[r_symndx] |= 1;
+ }
+
+ relocation = sgot->output_offset + off;
+ }
+
+ break;
+
+ case R_X86_64_GOTPCREL:
+ /* Use global offset table as symbol value. */
+
+ if (sgot == NULL)
+ {
+ sgot = bfd_get_section_by_name (dynobj, ".got");
+ BFD_ASSERT (sgot != NULL);
+ }
+
+ relocation = sgot->output_section->vma + (h->got.offset & ~1);
+
+ break;
+
+ case R_X86_64_PLT32:
+ /* Relocation is to the entry for this symbol in the
+ procedure linkage table. */
+
+ /* Resolve a PLT32 reloc against a local symbol directly,
+ without using the procedure linkage table. */
+ if (h == NULL)
+ break;
+
+ if (h->plt.offset == (bfd_vma) -1 || splt == NULL)
+ {
+ /* We didn't make a PLT entry for this symbol. This
+ happens when statically linking PIC code, or when
+ using -Bsymbolic. */
+ break;
+ }
+
+ relocation = (splt->output_section->vma
+ + splt->output_offset
+ + h->plt.offset);
+ break;
+
+ case R_X86_64_8:
+ case R_X86_64_16:
+ case R_X86_64_32:
+ case R_X86_64_PC8:
+ case R_X86_64_PC16:
+ case R_X86_64_PC32:
+ /* FIXME: The abi says the linker should make sure the value is
+ the same when it's zeroextended to 64 bit. */
+ if (info->shared
+ && (input_section->flags & SEC_ALLOC) != 0
+ && ((r_type != R_X86_64_PC8 && r_type != R_X86_64_PC16
+ && r_type != R_X86_64_PC32)
+ || (h != NULL
+ && h->dynindx != -1
+ && (! info->symbolic
+ || (h->elf_link_hash_flags
+ & ELF_LINK_HASH_DEF_REGULAR) == 0))))
+ {
+ Elf_Internal_Rela outrel;
+ boolean skip, relocate;
+
+ /* When generating a shared object, these relocations
+ are copied into the output file to be resolved at run
+ time. */
+
+ if (sreloc == NULL)
+ {
+ const char *name;
+
+ name = (bfd_elf_string_from_elf_section
+ (input_bfd,
+ elf_elfheader (input_bfd)->e_shstrndx,
+ elf_section_data (input_section)->rel_hdr.sh_name));
+ if (name == NULL)
+ return false;
+
+ BFD_ASSERT (strncmp (name, ".rela", 5) == 0
+ && strcmp (bfd_get_section_name (input_bfd,
+ input_section),
+ name + 5) == 0);
+
+ sreloc = bfd_get_section_by_name (dynobj, name);
+ BFD_ASSERT (sreloc != NULL);
+ }
+
+ skip = false;
+
+ if (elf_section_data (input_section)->stab_info == NULL)
+ outrel.r_offset = rela->r_offset;
+ else
+ {
+ bfd_vma off;
+
+ off = (_bfd_stab_section_offset
+ (output_bfd, &elf_hash_table (info)->stab_info,
+ input_section,
+ &elf_section_data (input_section)->stab_info,
+ rela->r_offset));
+ if (off == (bfd_vma) -1)
+ skip = true;
+ outrel.r_offset = off;
+ }
+
+ outrel.r_offset += (input_section->output_section->vma
+ + input_section->output_offset);
+
+ if (skip)
+ {
+ memset (&outrel, 0, sizeof outrel);
+ relocate = false;
+ }
+ else if ((r_type == R_X86_64_PC8) || (r_type == R_X86_64_PC16)
+ || (r_type == R_X86_64_PC32))
+ {
+ BFD_ASSERT (h != NULL && h->dynindx != -1);
+ relocate = false;
+ outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
+ outrel.r_addend = relocation + rela->r_addend;
+ }
+ else
+ {
+ /* h->dynindx may be -1 if this symbol was marked to
+ become local. */
+ if (h == NULL
+ || ((info->symbolic || h->dynindx == -1)
+ && (h->elf_link_hash_flags
+ & ELF_LINK_HASH_DEF_REGULAR) != 0))
+ {
+ relocate = true;
+ outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
+ outrel.r_addend = relocation + rela->r_addend;
+ }
+ else
+ {
+ BFD_ASSERT (h->dynindx != -1);
+ relocate = false;
+ outrel.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_32);
+ outrel.r_addend = relocation + rela->r_addend;
+ }
+ }
+
+ bfd_elf64_swap_reloca_out (output_bfd, &outrel,
+ (((Elf64_External_Rela *)
+ sreloc->contents)
+ + sreloc->reloc_count));
+ ++sreloc->reloc_count;
+
+ /* If this reloc is against an external symbol, we do
+ not want to fiddle with the addend. Otherwise, we
+ need to include the symbol value so that it becomes
+ an addend for the dynamic reloc. */
+ if (! relocate)
+ continue;
+ }
+
+ break;
+
+ default:
+ break;
+ }
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
- contents, rel->r_offset,
- relocation, rel->r_addend);
+ contents, rela->r_offset,
+ relocation, rela->r_addend);
if (r != bfd_reloc_ok)
{
}
if (! ((*info->callbacks->reloc_overflow)
(info, name, howto->name, (bfd_vma) 0,
- input_bfd, input_section, rel->r_offset)))
+ input_bfd, input_section, rela->r_offset)))
return false;
}
break;
}
}
}
+
+ return true;
+}
+
+/* Finish up dynamic symbol handling. We set the contents of various
+ dynamic sections here. */
+
+static boolean
+elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym)
+ bfd *output_bfd;
+ struct bfd_link_info *info;
+ struct elf_link_hash_entry *h;
+ Elf_Internal_Sym *sym;
+{
+ bfd *dynobj;
+
+ dynobj = elf_hash_table (info)->dynobj;
+
+ if (h->plt.offset != (bfd_vma) -1)
+ {
+ asection *splt;
+ asection *sgot;
+ asection *srela;
+ bfd_vma plt_index;
+ bfd_vma got_offset;
+ Elf_Internal_Rela rela;
+
+ /* This symbol has an entry in the procedure linkage table. Set
+ it up. */
+
+ BFD_ASSERT (h->dynindx != -1);
+
+ splt = bfd_get_section_by_name (dynobj, ".plt");
+ sgot = bfd_get_section_by_name (dynobj, ".got.plt");
+ srela = bfd_get_section_by_name (dynobj, ".rela.plt");
+ BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
+
+ /* Get the index in the procedure linkage table which
+ corresponds to this symbol. This is the index of this symbol
+ in all the symbols for which we are making plt entries. The
+ first entry in the procedure linkage table is reserved. */
+ plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
+
+ /* Get the offset into the .got table of the entry that
+ corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
+ bytes. The first three are reserved. */
+ got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
+
+ /* Fill in the entry in the procedure linkage table. */
+ memcpy (splt->contents + h->plt.offset, elf64_x86_64_plt_entry,
+ PLT_ENTRY_SIZE);
+
+ /* Insert the relocation positions of the plt section. The magic
+ numbers at the end of the statements are the positions of the
+ relocations in the plt section. */
+ bfd_put_64 (output_bfd, got_offset, splt->contents + h->plt.offset + 2);
+ bfd_put_64 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
+ splt->contents + h->plt.offset + 7);
+ bfd_put_64 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
+ splt->contents + h->plt.offset + 12);
+
+ /* Fill in the entry in the global offset table. */
+ bfd_put_64 (output_bfd, (splt->output_section->vma + splt->output_offset
+ + h->plt.offset + 6),
+ sgot->contents + got_offset);
+
+ /* Fill in the entry in the .rela.plt section. */
+ rela.r_offset = (sgot->output_section->vma
+ + sgot->output_offset
+ + got_offset);
+ rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
+ rela.r_addend = 0;
+ bfd_elf64_swap_reloca_out (output_bfd, &rela,
+ ((Elf64_External_Rela *) srela->contents
+ + plt_index));
+
+ if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
+ {
+ /* Mark the symbol as undefined, rather than as defined in
+ the .plt section. Leave the value alone. */
+ sym->st_shndx = SHN_UNDEF;
+ }
+ }
+
+ if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
+ {
+ asection *s;
+ Elf_Internal_Rela rela;
+
+ /* This symbol needs a copy reloc. Set it up. */
+
+ BFD_ASSERT (h->dynindx != -1
+ && (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak));
+
+ s = bfd_get_section_by_name (h->root.u.def.section->owner,
+ ".rela.bss");
+ BFD_ASSERT (s != NULL);
+
+ rela.r_offset = (h->root.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset);
+ rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
+ rela.r_addend = 0;
+ bfd_elf64_swap_reloca_out (output_bfd, &rela,
+ ((Elf64_External_Rela *) s->contents
+ + s->reloc_count));
+ ++s->reloc_count;
+ }
+
+ /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
+ if (strcmp (h->root.root.string, "_DYNAMIC") == 0
+ || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
+ sym->st_shndx = SHN_ABS;
+
+ return true;
+}
+
+/* Finish up the dynamic sections. */
+
+static boolean
+elf64_x86_64_finish_dynamic_sections (output_bfd, info)
+ bfd *output_bfd;
+ struct bfd_link_info *info;
+{
+ bfd *dynobj;
+ asection *sdyn;
+ asection *sgot;
+
+ dynobj = elf_hash_table (info)->dynobj;
+
+ sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
+
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ asection *splt;
+ Elf64_External_Dyn *dyncon, *dynconend;
+
+ splt = bfd_get_section_by_name (dynobj, ".plt");
+ BFD_ASSERT (splt != NULL && sdyn != NULL);
+
+ dyncon = (Elf64_External_Dyn *) sdyn->contents;
+ dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
+ for (; dyncon < dynconend; dyncon++)
+ {
+ Elf_Internal_Dyn dyn;
+ const char *name;
+ asection *s;
+
+ bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
+
+ switch (dyn.d_tag)
+ {
+ default:
+ break;
+
+ case DT_PLTGOT:
+ name = ".got";
+ goto get_vma;
+
+ case DT_JMPREL:
+ name = ".rela.plt";
+
+ get_vma:
+ s = bfd_get_section_by_name (output_bfd, name);
+ BFD_ASSERT (s != NULL);
+ dyn.d_un.d_ptr = s->vma;
+ break;
+
+ case DT_RELASZ:
+ /* FIXME: This comment and code is from elf64-alpha.c: */
+ /* My interpretation of the TIS v1.1 ELF document indicates
+ that RELASZ should not include JMPREL. This is not what
+ the rest of the BFD does. It is, however, what the
+ glibc ld.so wants. Do this fixup here until we found
+ out who is right. */
+ s = bfd_get_section_by_name (output_bfd, ".rela.plt");
+ if (s)
+ {
+ /* Subtract JMPREL size from RELASZ. */
+ dyn.d_un.d_val -=
+ (s->_cooked_size ? s->_cooked_size : s->_raw_size);
+ }
+ break;
+
+ case DT_PLTRELSZ:
+ s = bfd_get_section_by_name (output_bfd, ".rela.plt");
+ BFD_ASSERT (s != NULL);
+ dyn.d_un.d_val =
+ (s->_cooked_size != 0 ? s->_cooked_size : s->_raw_size);
+ break;
+ }
+
+ bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
+ }
+
+ /* Initialize the contents of the .plt section. */
+ if (splt->_raw_size > 0)
+ {
+ memcpy (splt->contents, elf64_x86_64_plt0_entry, PLT_ENTRY_SIZE);
+ }
+
+ elf_section_data (splt->output_section)->this_hdr.sh_entsize =
+ PLT_ENTRY_SIZE;
+ }
+
+ /* Set the first entry in the global offset table to the address of
+ the dynamic section. */
+ sgot = bfd_get_section_by_name (dynobj, ".got");
+ BFD_ASSERT (sgot != NULL);
+ if (sgot->_raw_size > 0)
+ {
+ if (sdyn == NULL)
+ bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents);
+ else
+ bfd_put_64 (output_bfd,
+ sdyn->output_section->vma + sdyn->output_offset,
+ sgot->contents);
+ /* Write GOT[1] and GOT[2], needed for the linker. */
+ bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + GOT_ENTRY_SIZE);
+ bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + GOT_ENTRY_SIZE*2);
+ }
+
+ elf_section_data (sgot->output_section)->this_hdr.sh_entsize =
+ GOT_ENTRY_SIZE;
+
return true;
}
-#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
-#define TARGET_LITTLE_NAME "elf64-x86-64"
-#define ELF_ARCH bfd_arch_i386
-#define ELF_MACHINE_CODE EM_X86_64
-#define ELF_MAXPAGESIZE 0x100000
-#define elf_info_to_howto elf64_x86_64_info_to_howto
-#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
-#define elf_backend_object_p elf64_x86_64_elf_object_p
-#define elf_backend_relocate_section elf64_x86_64_relocate_section
-#define bfd_elf64_bfd_link_hash_table_create elf64_x86_64_link_hash_table_create
+
+#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
+#define TARGET_LITTLE_NAME "elf64-x86-64"
+#define ELF_ARCH bfd_arch_i386
+#define ELF_MACHINE_CODE EM_X86_64
+#define ELF_MAXPAGESIZE 0x100000
+
+#define elf_backend_can_gc_sections 1
+#define elf_backend_want_got_plt 1
+#define elf_backend_plt_readonly 1
+#define elf_backend_want_plt_sym 0
+#define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
+#define elf_backend_plt_header_size PLT_ENTRY_SIZE
+
+#define elf_info_to_howto elf64_x86_64_info_to_howto
+#define elf_backend_object_p elf64_x86_64_elf_object_p
+#define elf_backend_relocate_section elf64_x86_64_relocate_section
+
+#define bfd_elf64_bfd_final_link _bfd_elf64_gc_common_final_link
+#define bfd_elf64_bfd_link_hash_table_create \
+ elf64_x86_64_link_hash_table_create
+#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
+
+#define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
+#define elf_backend_check_relocs elf64_x86_64_check_relocs
+#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
+#define elf_backend_finish_dynamic_sections \
+ elf64_x86_64_finish_dynamic_sections
+#define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
+#define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
+#define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
+#define elf_backend_relocate_section elf64_x86_64_relocate_section
+#define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
#include "elf64-target.h"
projects / binutils-gdb.git / commitdiff