diff options
Diffstat (limited to 'bfd/elf64-x86-64.c')
| -rw-r--r-- | bfd/elf64-x86-64.c | 1973 |
1 files changed, 0 insertions, 1973 deletions
diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c deleted file mode 100644 index 7b37d964433..00000000000 --- a/bfd/elf64-x86-64.c +++ /dev/null @@ -1,1973 +0,0 @@ -/* X86-64 specific support for 64-bit ELF - 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. - -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#include "bfd.h" -#include "sysdep.h" -#include "libbfd.h" -#include "elf-bfd.h" - -#include "elf/x86-64.h" - -/* We use only the RELA entries. */ -#define USE_RELA - -/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ -#define MINUS_ONE (~ (bfd_vma) 0) - -/* 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[] = -{ - HOWTO(R_X86_64_NONE, 0, 0, 0, false, 0, complain_overflow_dont, - bfd_elf_generic_reloc, "R_X86_64_NONE", false, 0x00000000, 0x00000000, - false), - HOWTO(R_X86_64_64, 0, 4, 64, false, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_X86_64_64", false, MINUS_ONE, MINUS_ONE, - false), - HOWTO(R_X86_64_PC32, 0, 4, 32, true, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_PC32", false, 0xffffffff, 0xffffffff, - true), - HOWTO(R_X86_64_GOT32, 0, 4, 32, false, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_GOT32", false, 0xffffffff, 0xffffffff, - false), - HOWTO(R_X86_64_PLT32, 0, 4, 32, true, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_PLT32", false, 0xffffffff, 0xffffffff, - true), - HOWTO(R_X86_64_COPY, 0, 4, 32, false, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_X86_64_COPY", false, 0xffffffff, 0xffffffff, - false), - HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, false, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", false, MINUS_ONE, - MINUS_ONE, false), - HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, false, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", false, MINUS_ONE, - MINUS_ONE, false), - HOWTO(R_X86_64_RELATIVE, 0, 4, 64, false, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_X86_64_RELATIVE", false, MINUS_ONE, - MINUS_ONE, false), - HOWTO(R_X86_64_GOTPCREL, 0, 4, 32, true,0 , complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", false, 0xffffffff, - 0xffffffff, true), - HOWTO(R_X86_64_32, 0, 4, 32, false, 0, complain_overflow_unsigned, - bfd_elf_generic_reloc, "R_X86_64_32", false, 0xffffffff, 0xffffffff, - false), - HOWTO(R_X86_64_32S, 0, 4, 32, false, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_32S", false, 0xffffffff, 0xffffffff, - false), - HOWTO(R_X86_64_16, 0, 1, 16, false, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_X86_64_16", false, 0xffff, 0xffff, false), - HOWTO(R_X86_64_PC16,0, 1, 16, true, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_X86_64_PC16", false, 0xffff, 0xffff, true), - HOWTO(R_X86_64_8, 0, 0, 8, false, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_8", false, 0xff, 0xff, false), - HOWTO(R_X86_64_PC8, 0, 0, 8, true, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_PC8", false, 0xff, 0xff, true), - -/* GNU extension to record C++ vtable hierarchy. */ - HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, false, 0, complain_overflow_dont, - NULL, "R_X86_64_GNU_VTINHERIT", false, 0, 0, false), - -/* GNU extension to record C++ vtable member usage. */ - HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, false, 0, complain_overflow_dont, - _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", false, 0, 0, - false) -}; - -/* Map BFD relocs to the x86_64 elf relocs. */ -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_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, - { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, -}; - -static reloc_howto_type *elf64_x86_64_reloc_type_lookup - PARAMS ((bfd *, bfd_reloc_code_real_type)); -static void elf64_x86_64_info_to_howto - 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 * -elf64_x86_64_reloc_type_lookup (abfd, code) - bfd *abfd ATTRIBUTE_UNUSED; - bfd_reloc_code_real_type code; -{ - unsigned int i; - for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); - i++) - { - if (x86_64_reloc_map[i].bfd_reloc_val == code) - return &x86_64_elf_howto_table[(int) - x86_64_reloc_map[i].elf_reloc_val]; - } - return 0; -} - -/* Given an x86_64 ELF reloc type, fill in an arelent structure. */ - -static void -elf64_x86_64_info_to_howto (abfd, cache_ptr, dst) - bfd *abfd ATTRIBUTE_UNUSED; - arelent *cache_ptr; - Elf64_Internal_Rela *dst; -{ - unsigned r_type, i; - - r_type = ELF64_R_TYPE (dst->r_info); - if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT) - { - BFD_ASSERT (r_type <= (unsigned int) R_X86_64_PC8); - i = r_type; - } - else - { - BFD_ASSERT (r_type < (unsigned int) R_X86_64_max); - i = r_type - ((unsigned int) R_X86_64_GNU_VTINHERIT - R_X86_64_PC8 - 1); - } - cache_ptr->howto = &x86_64_elf_howto_table[i]; - BFD_ASSERT (r_type == cache_ptr->howto->type); -} - -/* 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/ld64.so.1" - -/* The size in bytes of an entry in the global offset table. */ - -#define GOT_ENTRY_SIZE 8 - -/* The size in bytes of an entry in the procedure linkage 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, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ - 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ - 0x90, 0x90, 0x90, 0x90 /* pad out to 16 bytes with nops. */ -}; - -/* Subsequent entries in a procedure linkage table look like this. */ - -static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] = -{ - 0xff, 0x25, /* jmpq *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; -}; - -/* 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 * -elf64_x86_64_link_hash_table_create (abfd) - bfd *abfd; -{ - struct elf64_x86_64_link_hash_table *ret; - - ret = ((struct elf64_x86_64_link_hash_table *) - bfd_alloc (abfd, sizeof (struct elf64_x86_64_link_hash_table))); - if (ret == (struct elf64_x86_64_link_hash_table *) NULL) - return NULL; - - if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, - elf64_x86_64_link_hash_newfunc)) - { - bfd_release (abfd, ret); - return NULL; - } - - return &ret->root.root; -} - -boolean -elf64_x86_64_elf_object_p (abfd) - bfd *abfd; -{ - /* Set the right machine number for an x86-64 elf64 file. */ - bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); - 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_GOTPCREL: - 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, 3)) - 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; - - h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; - if (h->plt.refcount == -1) - h->plt.refcount = 1; - else - h->plt.refcount += 1; - break; - - case R_X86_64_8: - case R_X86_64_16: - case R_X86_64_32: - case R_X86_64_64: - 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_PC8) - && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC16) - && (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, 3)) - 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_PC8) - || (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC16) - || (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; - - /* This relocation describes the C++ object vtable hierarchy. - Reconstruct it for later use during GC. */ - case R_X86_64_GNU_VTINHERIT: - if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) - return false; - break; - - /* This relocation describes which C++ vtable entries are actually - used. Record for later use during GC. */ - case R_X86_64_GNU_VTENTRY: - if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend)) - return false; - 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 (ELF64_R_TYPE (rel->r_info)) - { - case R_X86_64_GNU_VTINHERIT: - case R_X86_64_GNU_VTENTRY: - break; - - default: - 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 ((! info->shared - && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 - && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) - || (info->shared && h->plt.refcount <= 0)) - { - /* 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. */ - 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 .got.plt section, which - will be placed in the .got section by the linker script. */ - s = bfd_get_section_by_name (dynobj, ".got.plt"); - BFD_ASSERT (s != NULL); - s->_raw_size += GOT_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) - { - 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_RELA) - || ! 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 -elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, - contents, relocs, local_syms, local_sections) - bfd *output_bfd; - struct bfd_link_info *info; - bfd *input_bfd; - asection *input_section; - bfd_byte *contents; - Elf_Internal_Rela *relocs; - Elf_Internal_Sym *local_syms; - asection **local_sections; -{ - bfd *dynobj; - 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 *rela; - Elf_Internal_Rela *relend; - - dynobj = elf_hash_table (info)->dynobj; - symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; - sym_hashes = elf_sym_hashes (input_bfd); - local_got_offsets = elf_local_got_offsets (input_bfd); - - sreloc = splt = sgot = NULL; - if (dynobj != NULL) - { - splt = bfd_get_section_by_name (dynobj, ".plt"); - sgot = bfd_get_section_by_name (dynobj, ".got"); - } - - rela = relocs; - relend = relocs + input_section->reloc_count; - for (; rela < relend; rela++) - { - int r_type; - reloc_howto_type *howto; - unsigned long r_symndx; - struct elf_link_hash_entry *h; - Elf_Internal_Sym *sym; - asection *sec; - bfd_vma relocation; - bfd_reloc_status_type r; - unsigned int indx; - - r_type = ELF64_R_TYPE (rela->r_info); - if (r_type == (int) R_X86_64_GNU_VTINHERIT - || r_type == (int) R_X86_64_GNU_VTENTRY) - continue; - - if ((indx = (unsigned) r_type) >= R_X86_64_max) - { - bfd_set_error (bfd_error_bad_value); - return false; - } - howto = x86_64_elf_howto_table + indx; - - r_symndx = ELF64_R_SYM (rela->r_info); - - if (info->relocateable) - { - /* This is a relocateable link. We don't have to change - anything, unless the reloc is against a section symbol, - in which case we have to adjust according to where the - section symbol winds up in the output section. */ - if (r_symndx < symtab_hdr->sh_info) - { - sym = local_syms + r_symndx; - if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) - { - sec = local_sections[r_symndx]; - rela->r_addend += sec->output_offset + sym->st_value; - } - } - - continue; - } - - /* This is a final link. */ - h = NULL; - sym = NULL; - sec = NULL; - if (r_symndx < symtab_hdr->sh_info) - { - sym = local_syms + r_symndx; - sec = local_sections[r_symndx]; - relocation = (sec->output_section->vma - + sec->output_offset - + sym->st_value); - } - else - { - h = sym_hashes[r_symndx - symtab_hdr->sh_info]; - while (h->root.type == bfd_link_hash_indirect - || 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) - { - sec = h->root.u.def.section; - if ((r_type == R_X86_64_PLT32 - && splt != NULL - && h->plt.offset != (bfd_vma) -1) - || ((r_type == R_X86_64_GOT32 || r_type == R_X86_64_GOTPCREL) - && elf_hash_table (info)->dynamic_sections_created - && (!info->shared - || (! info->symbolic && h->dynindx != -1) - || (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0)) - || (info->shared - && ((! info->symbolic && h->dynindx != -1) - || (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0) - && (r_type == R_X86_64_8 - || r_type == R_X86_64_16 - || r_type == R_X86_64_32 - || r_type == R_X86_64_64 - || r_type == R_X86_64_PC8 - || r_type == R_X86_64_PC16 - || r_type == R_X86_64_PC32) - && ((input_section->flags & SEC_ALLOC) != 0 - /* DWARF will emit R_X86_64_32 relocations in its - sections against symbols defined externally - in shared libraries. We can't do anything - with them here. */ - || ((input_section->flags & SEC_DEBUGGING) != 0 - && (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_DYNAMIC) != 0)))) - { - /* In these cases, we don't need the relocation - value. We check specially because in some - obscure cases sec->output_section will be NULL. */ - relocation = 0; - } - else if (sec->output_section == NULL) - { - (*_bfd_error_handler) - (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), - bfd_get_filename (input_bfd), h->root.root.string, - bfd_get_section_name (input_bfd, input_section)); - relocation = 0; - } - else - relocation = (h->root.u.def.value - + sec->output_section->vma - + sec->output_offset); - } - 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, rela->r_offset, - (!info->shared || info->no_undefined - || ELF_ST_VISIBILITY (h->other))))) - return false; - relocation = 0; - } - } - - /* 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. */ - case R_X86_64_GOTPCREL: - /* Use global offset table as symbol value. */ - 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; - } - } - if (r_type == R_X86_64_GOTPCREL) - relocation = sgot->output_section->vma + sgot->output_offset + off; - else - 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) - { - 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; - } - - if (r_type == R_X86_64_GOTPCREL) - relocation = sgot->output_section->vma + sgot->output_offset + off; - else - relocation = sgot->output_offset + off; - } - - 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_PC8: - case R_X86_64_PC16: - case R_X86_64_PC32: - if (h == NULL || h->dynindx == -1 - || (info->symbolic - && h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) - break; - /* Fall through. */ - case R_X86_64_8: - case R_X86_64_16: - case R_X86_64_32: - case R_X86_64_64: - /* 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) - { - 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; - } - /* h->dynindx may be -1 if this symbol was marked to - become local. */ - else if (h != NULL - && ((! info->symbolic && h->dynindx != -1) - || (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0)) - { - BFD_ASSERT (h->dynindx != -1); - relocate = false; - outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); - outrel.r_addend = relocation + rela->r_addend; - } - else - { - if (r_type == R_X86_64_64) - { - relocate = true; - outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); - outrel.r_addend = relocation + rela->r_addend; - } - else - { - long indx; - - if (h == NULL) - sec = local_sections[r_symndx]; - else - { - BFD_ASSERT (h->root.type == bfd_link_hash_defined - || (h->root.type - == bfd_link_hash_defweak)); - sec = h->root.u.def.section; - } - if (sec != NULL && bfd_is_abs_section (sec)) - indx = 0; - else if (sec == NULL || sec->owner == NULL) - { - bfd_set_error (bfd_error_bad_value); - return false; - } - else - { - asection *osec; - - osec = sec->output_section; - indx = elf_section_data (osec)->dynindx; - BFD_ASSERT (indx > 0); - } - - relocate = false; - outrel.r_info = ELF64_R_INFO (indx, r_type); - 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, rela->r_offset, - relocation, rela->r_addend); - - if (r != bfd_reloc_ok) - { - switch (r) - { - default: - case bfd_reloc_outofrange: - abort (); - case bfd_reloc_overflow: - { - const char *name; - - if (h != NULL) - name = h->root.root.string; - else - { - name = bfd_elf_string_from_elf_section (input_bfd, - symtab_hdr->sh_link, - sym->st_name); - if (name == NULL) - return false; - if (*name == '\0') - name = bfd_section_name (input_bfd, sec); - } - if (! ((*info->callbacks->reloc_overflow) - (info, name, howto->name, (bfd_vma) 0, - 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 for the dynamic linker. */ - 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. */ - /* Put offset for jmp *name@GOTPCREL(%rip), since the - instruction uses 6 bytes, subtract this value. */ - bfd_put_32 (output_bfd, - (sgot->output_section->vma - + sgot->output_offset - + got_offset - - splt->output_section->vma - - splt->output_offset - - h->plt.offset - - 6), - splt->contents + h->plt.offset + 2); - /* Put relocation index. */ - bfd_put_32 (output_bfd, plt_index, - splt->contents + h->plt.offset + 7); - /* Put offset for jmp .PLT0. */ - bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), - splt->contents + h->plt.offset + 12); - - /* Fill in the entry in the global offset table, initially this - points to the pushq instruction in the PLT which is at offset 6. */ - 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 the symbol is weak, we do need to clear the value. - Otherwise, the PLT entry would provide a definition for - the symbol even if the symbol wasn't defined anywhere, - and so the symbol would never be NULL. */ - if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) - == 0) - sym->st_value = 0; - } - } - - if (h->got.offset != (bfd_vma) -1) - { - asection *sgot; - asection *srela; - Elf_Internal_Rela rela; - - /* This symbol has an entry in the global offset table. Set it - up. */ - - sgot = bfd_get_section_by_name (dynobj, ".got"); - srela = bfd_get_section_by_name (dynobj, ".rela.got"); - BFD_ASSERT (sgot != NULL && srela != NULL); - - rela.r_offset = (sgot->output_section->vma - + sgot->output_offset - + (h->got.offset &~ 1)); - - /* If this is a static link, or it is a -Bsymbolic link and the - symbol is defined locally or was forced to be local because - of a version file, we just want to emit a RELATIVE reloc. - The entry in the global offset table will already have been - initialized in the relocate_section function. */ - 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))) - { - BFD_ASSERT((h->got.offset & 1) != 0); - rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); - rela.r_addend = (h->root.u.def.value - + h->root.u.def.section->output_section->vma - + h->root.u.def.section->output_offset); - } - else - { - BFD_ASSERT((h->got.offset & 1) == 0); - bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); - rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT); - rela.r_addend = 0; - } - - bfd_elf64_swap_reloca_out (output_bfd, &rela, - ((Elf64_External_Rela *) srela->contents - + srela->reloc_count)); - ++srela->reloc_count; - } - - 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; - - sgot = bfd_get_section_by_name (dynobj, ".got.plt"); - BFD_ASSERT (sgot != NULL); - sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); - - if (elf_hash_table (info)->dynamic_sections_created) - { - asection *splt; - Elf64_External_Dyn *dyncon, *dynconend; - - BFD_ASSERT (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: - continue; - - 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. */ - splt = bfd_get_section_by_name (dynobj, ".plt"); - BFD_ASSERT (splt != NULL); - if (splt->_raw_size > 0) - { - /* Fill in the first entry in the procedure linkage table. */ - memcpy (splt->contents, elf64_x86_64_plt0_entry, PLT_ENTRY_SIZE); - /* Add offset for pushq GOT+8(%rip), since the instruction - uses 6 bytes subtract this value. */ - bfd_put_32 (output_bfd, - (sgot->output_section->vma - + sgot->output_offset - + 8 - - splt->output_section->vma - - splt->output_offset - - 6), - splt->contents + 2); - /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to - the end of the instruction. */ - bfd_put_32 (output_bfd, - (sgot->output_section->vma - + sgot->output_offset - + 16 - - splt->output_section->vma - - splt->output_offset - - 12), - splt->contents + 8); - - } - - 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. */ - 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 dynamic 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_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 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 -#define elf_backend_object_p elf64_x86_64_elf_object_p - -#include "elf64-target.h" |