diff options
Diffstat (limited to 'contrib/binutils/bfd/elf64-x86-64.c')
| -rw-r--r-- | contrib/binutils/bfd/elf64-x86-64.c | 2790 |
1 files changed, 0 insertions, 2790 deletions
diff --git a/contrib/binutils/bfd/elf64-x86-64.c b/contrib/binutils/bfd/elf64-x86-64.c deleted file mode 100644 index a1d62501f960..000000000000 --- a/contrib/binutils/bfd/elf64-x86-64.c +++ /dev/null @@ -1,2790 +0,0 @@ -/* X86-64 specific support for 64-bit ELF - Copyright 2000, 2001, 2002, 2003, 2004 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 "bfdlink.h" -#include "libbfd.h" -#include "elf-bfd.h" - -#include "elf/x86-64.h" - -/* 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, 2, 32, TRUE, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff, - TRUE), - HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff, - FALSE), - HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff, - TRUE), - HOWTO(R_X86_64_COPY, 0, 2, 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, 2, 32, TRUE, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff, - 0xffffffff, TRUE), - HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, - bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, - FALSE), - HOWTO(R_X86_64_32S, 0, 2, 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), - HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE, - MINUS_ONE, FALSE), - HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE, - MINUS_ONE, FALSE), - HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE, - MINUS_ONE, FALSE), - HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff, - 0xffffffff, TRUE), - HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff, - 0xffffffff, TRUE), - HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff, - 0xffffffff, FALSE), - HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff, - 0xffffffff, TRUE), - HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff, - 0xffffffff, FALSE), - -/* 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_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, - { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, - { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, - { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, - { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, - { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, - { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, - { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, - { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, - { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, -}; - - -/* Given a BFD reloc type, return a HOWTO structure. */ -static reloc_howto_type * -elf64_x86_64_reloc_type_lookup (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[i]; - } - return 0; -} - -/* Given an x86_64 ELF reloc type, fill in an arelent structure. */ - -static void -elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, - Elf_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_TPOFF32); - 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_TPOFF32 - 1); - } - cache_ptr->howto = &x86_64_elf_howto_table[i]; - BFD_ASSERT (r_type == cache_ptr->howto->type); -} - -/* Support for core dump NOTE sections. */ -static bfd_boolean -elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) -{ - int offset; - size_t raw_size; - - switch (note->descsz) - { - default: - return FALSE; - - case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ - /* pr_cursig */ - elf_tdata (abfd)->core_signal - = bfd_get_16 (abfd, note->descdata + 12); - - /* pr_pid */ - elf_tdata (abfd)->core_pid - = bfd_get_32 (abfd, note->descdata + 32); - - /* pr_reg */ - offset = 112; - raw_size = 216; - - break; - } - - /* Make a ".reg/999" section. */ - return _bfd_elfcore_make_pseudosection (abfd, ".reg", - raw_size, note->descpos + offset); -} - -static bfd_boolean -elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) -{ - switch (note->descsz) - { - default: - return FALSE; - - case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ - elf_tdata (abfd)->core_program - = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); - elf_tdata (abfd)->core_command - = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); - } - - /* Note that for some reason, a spurious space is tacked - onto the end of the args in some (at least one anyway) - implementations, so strip it off if it exists. */ - - { - char *command = elf_tdata (abfd)->core_command; - int n = strlen (command); - - if (0 < n && command[n - 1] == ' ') - command[n - 1] = '\0'; - } - - return TRUE; -} - -/* 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" - -/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid - copying dynamic variables from a shared lib into an app's dynbss - section, and instead use a dynamic relocation to point into the - shared lib. */ -#define ELIMINATE_COPY_RELOCS 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 as dynamic relocs in check_relocs for each symbol. - This is so that it can later discard them if they are found to be - unnecessary. We store the information in a field extending the - regular ELF linker hash table. */ - -struct elf64_x86_64_dyn_relocs -{ - /* Next section. */ - struct elf64_x86_64_dyn_relocs *next; - - /* The input section of the reloc. */ - asection *sec; - - /* Total number of relocs copied for the input section. */ - bfd_size_type count; - - /* Number of pc-relative relocs copied for the input section. */ - bfd_size_type pc_count; -}; - -/* x86-64 ELF linker hash entry. */ - -struct elf64_x86_64_link_hash_entry -{ - struct elf_link_hash_entry elf; - - /* Track dynamic relocs copied for this symbol. */ - struct elf64_x86_64_dyn_relocs *dyn_relocs; - -#define GOT_UNKNOWN 0 -#define GOT_NORMAL 1 -#define GOT_TLS_GD 2 -#define GOT_TLS_IE 3 - unsigned char tls_type; -}; - -#define elf64_x86_64_hash_entry(ent) \ - ((struct elf64_x86_64_link_hash_entry *)(ent)) - -struct elf64_x86_64_obj_tdata -{ - struct elf_obj_tdata root; - - /* tls_type for each local got entry. */ - char *local_got_tls_type; -}; - -#define elf64_x86_64_tdata(abfd) \ - ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any) - -#define elf64_x86_64_local_got_tls_type(abfd) \ - (elf64_x86_64_tdata (abfd)->local_got_tls_type) - - -/* x86-64 ELF linker hash table. */ - -struct elf64_x86_64_link_hash_table -{ - struct elf_link_hash_table elf; - - /* Short-cuts to get to dynamic linker sections. */ - asection *sgot; - asection *sgotplt; - asection *srelgot; - asection *splt; - asection *srelplt; - asection *sdynbss; - asection *srelbss; - - union { - bfd_signed_vma refcount; - bfd_vma offset; - } tls_ld_got; - - /* Small local sym to section mapping cache. */ - struct sym_sec_cache sym_sec; -}; - -/* 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 * -link_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table, - const char *string) -{ - /* Allocate the structure if it has not already been allocated by a - subclass. */ - if (entry == NULL) - { - entry = bfd_hash_allocate (table, - sizeof (struct elf64_x86_64_link_hash_entry)); - if (entry == NULL) - return entry; - } - - /* Call the allocation method of the superclass. */ - entry = _bfd_elf_link_hash_newfunc (entry, table, string); - if (entry != NULL) - { - struct elf64_x86_64_link_hash_entry *eh; - - eh = (struct elf64_x86_64_link_hash_entry *) entry; - eh->dyn_relocs = NULL; - eh->tls_type = GOT_UNKNOWN; - } - - return entry; -} - -/* Create an X86-64 ELF linker hash table. */ - -static struct bfd_link_hash_table * -elf64_x86_64_link_hash_table_create (bfd *abfd) -{ - struct elf64_x86_64_link_hash_table *ret; - bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table); - - ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt); - if (ret == NULL) - return NULL; - - if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc)) - { - free (ret); - return NULL; - } - - ret->sgot = NULL; - ret->sgotplt = NULL; - ret->srelgot = NULL; - ret->splt = NULL; - ret->srelplt = NULL; - ret->sdynbss = NULL; - ret->srelbss = NULL; - ret->sym_sec.abfd = NULL; - ret->tls_ld_got.refcount = 0; - - return &ret->elf.root; -} - -/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up - shortcuts to them in our hash table. */ - -static bfd_boolean -create_got_section (bfd *dynobj, struct bfd_link_info *info) -{ - struct elf64_x86_64_link_hash_table *htab; - - if (! _bfd_elf_create_got_section (dynobj, info)) - return FALSE; - - htab = elf64_x86_64_hash_table (info); - htab->sgot = bfd_get_section_by_name (dynobj, ".got"); - htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); - if (!htab->sgot || !htab->sgotplt) - abort (); - - htab->srelgot = bfd_make_section (dynobj, ".rela.got"); - if (htab->srelgot == NULL - || ! bfd_set_section_flags (dynobj, htab->srelgot, - (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS - | SEC_IN_MEMORY | SEC_LINKER_CREATED - | SEC_READONLY)) - || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3)) - return FALSE; - return TRUE; -} - -/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and - .rela.bss sections in DYNOBJ, and set up shortcuts to them in our - hash table. */ - -static bfd_boolean -elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) -{ - struct elf64_x86_64_link_hash_table *htab; - - htab = elf64_x86_64_hash_table (info); - if (!htab->sgot && !create_got_section (dynobj, info)) - return FALSE; - - if (!_bfd_elf_create_dynamic_sections (dynobj, info)) - return FALSE; - - htab->splt = bfd_get_section_by_name (dynobj, ".plt"); - htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); - htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); - if (!info->shared) - htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); - - if (!htab->splt || !htab->srelplt || !htab->sdynbss - || (!info->shared && !htab->srelbss)) - abort (); - - return TRUE; -} - -/* Copy the extra info we tack onto an elf_link_hash_entry. */ - -static void -elf64_x86_64_copy_indirect_symbol (const struct elf_backend_data *bed, - struct elf_link_hash_entry *dir, - struct elf_link_hash_entry *ind) -{ - struct elf64_x86_64_link_hash_entry *edir, *eind; - - edir = (struct elf64_x86_64_link_hash_entry *) dir; - eind = (struct elf64_x86_64_link_hash_entry *) ind; - - if (eind->dyn_relocs != NULL) - { - if (edir->dyn_relocs != NULL) - { - struct elf64_x86_64_dyn_relocs **pp; - struct elf64_x86_64_dyn_relocs *p; - - if (ind->root.type == bfd_link_hash_indirect) - abort (); - - /* Add reloc counts against the weak sym to the strong sym - list. Merge any entries against the same section. */ - for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) - { - struct elf64_x86_64_dyn_relocs *q; - - for (q = edir->dyn_relocs; q != NULL; q = q->next) - if (q->sec == p->sec) - { - q->pc_count += p->pc_count; - q->count += p->count; - *pp = p->next; - break; - } - if (q == NULL) - pp = &p->next; - } - *pp = edir->dyn_relocs; - } - - edir->dyn_relocs = eind->dyn_relocs; - eind->dyn_relocs = NULL; - } - - if (ind->root.type == bfd_link_hash_indirect - && dir->got.refcount <= 0) - { - edir->tls_type = eind->tls_type; - eind->tls_type = GOT_UNKNOWN; - } - - if (ELIMINATE_COPY_RELOCS - && ind->root.type != bfd_link_hash_indirect - && (dir->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0) - /* If called to transfer flags for a weakdef during processing - of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF. - We clear it ourselves for ELIMINATE_COPY_RELOCS. */ - dir->elf_link_hash_flags |= - (ind->elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC - | ELF_LINK_HASH_REF_REGULAR - | ELF_LINK_HASH_REF_REGULAR_NONWEAK - | ELF_LINK_HASH_NEEDS_PLT)); - else - _bfd_elf_link_hash_copy_indirect (bed, dir, ind); -} - -static bfd_boolean -elf64_x86_64_mkobject (bfd *abfd) -{ - bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata); - abfd->tdata.any = bfd_zalloc (abfd, amt); - if (abfd->tdata.any == NULL) - return FALSE; - return TRUE; -} - -static bfd_boolean -elf64_x86_64_elf_object_p (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; -} - -static int -elf64_x86_64_tls_transition (struct bfd_link_info *info, int r_type, int is_local) -{ - if (info->shared) - return r_type; - - switch (r_type) - { - case R_X86_64_TLSGD: - case R_X86_64_GOTTPOFF: - if (is_local) - return R_X86_64_TPOFF32; - return R_X86_64_GOTTPOFF; - case R_X86_64_TLSLD: - return R_X86_64_TPOFF32; - } - - return r_type; -} - -/* Look through the relocs for a section during the first phase, and - calculate needed space in the global offset table, procedure - linkage table, and dynamic reloc sections. */ - -static bfd_boolean -elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, - const Elf_Internal_Rela *relocs) -{ - struct elf64_x86_64_link_hash_table *htab; - Elf_Internal_Shdr *symtab_hdr; - struct elf_link_hash_entry **sym_hashes; - const Elf_Internal_Rela *rel; - const Elf_Internal_Rela *rel_end; - asection *sreloc; - - if (info->relocatable) - return TRUE; - - htab = elf64_x86_64_hash_table (info); - symtab_hdr = &elf_tdata (abfd)->symtab_hdr; - sym_hashes = elf_sym_hashes (abfd); - - sreloc = NULL; - - rel_end = relocs + sec->reloc_count; - for (rel = relocs; rel < rel_end; rel++) - { - unsigned int r_type; - unsigned long r_symndx; - struct elf_link_hash_entry *h; - - r_symndx = ELF64_R_SYM (rel->r_info); - r_type = ELF64_R_TYPE (rel->r_info); - - if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) - { - (*_bfd_error_handler) (_("%s: bad symbol index: %d"), - bfd_archive_filename (abfd), - r_symndx); - return FALSE; - } - - if (r_symndx < symtab_hdr->sh_info) - h = NULL; - else - h = sym_hashes[r_symndx - symtab_hdr->sh_info]; - - r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL); - switch (r_type) - { - case R_X86_64_TLSLD: - htab->tls_ld_got.refcount += 1; - goto create_got; - - case R_X86_64_TPOFF32: - if (info->shared) - { - (*_bfd_error_handler) - (_("%s: relocation %s can not be used when making a shared object; recompile with -fPIC"), - bfd_archive_filename (abfd), - x86_64_elf_howto_table[r_type].name); - bfd_set_error (bfd_error_bad_value); - return FALSE; - } - break; - - case R_X86_64_GOTTPOFF: - if (info->shared) - info->flags |= DF_STATIC_TLS; - /* Fall through */ - - case R_X86_64_GOT32: - case R_X86_64_GOTPCREL: - case R_X86_64_TLSGD: - /* This symbol requires a global offset table entry. */ - { - int tls_type, old_tls_type; - - switch (r_type) - { - default: tls_type = GOT_NORMAL; break; - case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break; - case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break; - } - - if (h != NULL) - { - h->got.refcount += 1; - old_tls_type = elf64_x86_64_hash_entry (h)->tls_type; - } - else - { - bfd_signed_vma *local_got_refcounts; - - /* This is a global offset table entry for a local symbol. */ - local_got_refcounts = elf_local_got_refcounts (abfd); - if (local_got_refcounts == NULL) - { - bfd_size_type size; - - size = symtab_hdr->sh_info; - size *= sizeof (bfd_signed_vma) + sizeof (char); - local_got_refcounts = ((bfd_signed_vma *) - bfd_zalloc (abfd, size)); - if (local_got_refcounts == NULL) - return FALSE; - elf_local_got_refcounts (abfd) = local_got_refcounts; - elf64_x86_64_local_got_tls_type (abfd) - = (char *) (local_got_refcounts + symtab_hdr->sh_info); - } - local_got_refcounts[r_symndx] += 1; - old_tls_type - = elf64_x86_64_local_got_tls_type (abfd) [r_symndx]; - } - - /* If a TLS symbol is accessed using IE at least once, - there is no point to use dynamic model for it. */ - if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN - && (old_tls_type != GOT_TLS_GD || tls_type != GOT_TLS_IE)) - { - if (old_tls_type == GOT_TLS_IE && tls_type == GOT_TLS_GD) - tls_type = old_tls_type; - else - { - (*_bfd_error_handler) - (_("%s: %s' accessed both as normal and thread local symbol"), - bfd_archive_filename (abfd), - h ? h->root.root.string : "<local>"); - return FALSE; - } - } - - if (old_tls_type != tls_type) - { - if (h != NULL) - elf64_x86_64_hash_entry (h)->tls_type = tls_type; - else - elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type; - } - } - /* Fall through */ - - //case R_X86_64_GOTPCREL: - create_got: - if (htab->sgot == NULL) - { - if (htab->elf.dynobj == NULL) - htab->elf.dynobj = abfd; - if (!create_got_section (htab->elf.dynobj, info)) - return FALSE; - } - 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; - h->plt.refcount += 1; - break; - - case R_X86_64_8: - case R_X86_64_16: - case R_X86_64_32: - case R_X86_64_32S: - /* Let's help debug shared library creation. These relocs - cannot be used in shared libs. Don't error out for - sections we don't care about, such as debug sections or - non-constant sections. */ - if (info->shared - && (sec->flags & SEC_ALLOC) != 0 - && (sec->flags & SEC_READONLY) != 0) - { - (*_bfd_error_handler) - (_("%s: relocation %s can not be used when making a shared object; recompile with -fPIC"), - bfd_archive_filename (abfd), - x86_64_elf_howto_table[r_type].name); - bfd_set_error (bfd_error_bad_value); - return FALSE; - } - /* Fall through. */ - - case R_X86_64_PC8: - case R_X86_64_PC16: - case R_X86_64_PC32: - case R_X86_64_64: - if (h != NULL && !info->shared) - { - /* If this reloc is in a read-only section, we might - need a copy reloc. We can't check reliably at this - stage whether the section is read-only, as input - sections have not yet been mapped to output sections. - Tentatively set the flag for now, and correct in - adjust_dynamic_symbol. */ - h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; - - /* We may need a .plt entry if the function this reloc - refers to is in a shared lib. */ - h->plt.refcount += 1; - } - - /* 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). In case of a weak definition, - DEF_REGULAR may be cleared later by a strong definition in - a shared library. We account for that possibility below by - storing information in the 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 on the other hand, we are creating an executable, we - may need to keep relocations for symbols satisfied by a - dynamic library if we manage to avoid copy relocs for the - symbol. */ - if ((info->shared - && (sec->flags & SEC_ALLOC) != 0 - && (((r_type != R_X86_64_PC8) - && (r_type != R_X86_64_PC16) - && (r_type != R_X86_64_PC32)) - || (h != NULL - && (! info->symbolic - || h->root.type == bfd_link_hash_defweak - || (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0)))) - || (ELIMINATE_COPY_RELOCS - && !info->shared - && (sec->flags & SEC_ALLOC) != 0 - && h != NULL - && (h->root.type == bfd_link_hash_defweak - || (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0))) - { - struct elf64_x86_64_dyn_relocs *p; - struct elf64_x86_64_dyn_relocs **head; - - /* We must copy these reloc types into the output file. - Create a reloc section in dynobj and make room for - this reloc. */ - if (sreloc == NULL) - { - const char *name; - bfd *dynobj; - - 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; - - if (strncmp (name, ".rela", 5) != 0 - || strcmp (bfd_get_section_name (abfd, sec), - name + 5) != 0) - { - (*_bfd_error_handler) - (_("%s: bad relocation section name `%s\'"), - bfd_archive_filename (abfd), name); - } - - if (htab->elf.dynobj == NULL) - htab->elf.dynobj = abfd; - - dynobj = htab->elf.dynobj; - - 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; - } - elf_section_data (sec)->sreloc = sreloc; - } - - /* If this is a global symbol, we count the number of - relocations we need for this symbol. */ - if (h != NULL) - { - head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs; - } - else - { - /* Track dynamic relocs needed for local syms too. - We really need local syms available to do this - easily. Oh well. */ - - asection *s; - s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, - sec, r_symndx); - if (s == NULL) - return FALSE; - - head = ((struct elf64_x86_64_dyn_relocs **) - &elf_section_data (s)->local_dynrel); - } - - p = *head; - if (p == NULL || p->sec != sec) - { - bfd_size_type amt = sizeof *p; - p = ((struct elf64_x86_64_dyn_relocs *) - bfd_alloc (htab->elf.dynobj, amt)); - if (p == NULL) - return FALSE; - p->next = *head; - *head = p; - p->sec = sec; - p->count = 0; - p->pc_count = 0; - } - - p->count += 1; - if (r_type == R_X86_64_PC8 - || r_type == R_X86_64_PC16 - || r_type == R_X86_64_PC32) - p->pc_count += 1; - } - break; - - /* This relocation describes the C++ object vtable hierarchy. - Reconstruct it for later use during GC. */ - case R_X86_64_GNU_VTINHERIT: - if (!bfd_elf_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_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) - return FALSE; - break; - - default: - break; - } - } - - return TRUE; -} - -/* Return the section that should be marked against GC for a given - relocation. */ - -static asection * -elf64_x86_64_gc_mark_hook (asection *sec, - struct bfd_link_info *info ATTRIBUTE_UNUSED, - Elf_Internal_Rela *rel, - 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 - return bfd_section_from_elf_index (sec->owner, sym->st_shndx); - - return NULL; -} - -/* Update the got entry reference counts for the section being removed. */ - -static bfd_boolean -elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, - 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; - - elf_section_data (sec)->local_dynrel = NULL; - - symtab_hdr = &elf_tdata (abfd)->symtab_hdr; - sym_hashes = elf_sym_hashes (abfd); - local_got_refcounts = elf_local_got_refcounts (abfd); - - relend = relocs + sec->reloc_count; - for (rel = relocs; rel < relend; rel++) - { - unsigned long r_symndx; - unsigned int r_type; - struct elf_link_hash_entry *h = NULL; - - r_symndx = ELF64_R_SYM (rel->r_info); - if (r_symndx >= symtab_hdr->sh_info) - { - struct elf64_x86_64_link_hash_entry *eh; - struct elf64_x86_64_dyn_relocs **pp; - struct elf64_x86_64_dyn_relocs *p; - - h = sym_hashes[r_symndx - symtab_hdr->sh_info]; - eh = (struct elf64_x86_64_link_hash_entry *) h; - - for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) - if (p->sec == sec) - { - /* Everything must go for SEC. */ - *pp = p->next; - break; - } - } - - r_type = ELF64_R_TYPE (rel->r_info); - r_type = elf64_x86_64_tls_transition (info, r_type, h != NULL); - switch (r_type) - { - case R_X86_64_TLSLD: - if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0) - elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1; - break; - - case R_X86_64_TLSGD: - case R_X86_64_GOTTPOFF: - case R_X86_64_GOT32: - case R_X86_64_GOTPCREL: - if (h != NULL) - { - if (h->got.refcount > 0) - h->got.refcount -= 1; - } - else if (local_got_refcounts != NULL) - { - if (local_got_refcounts[r_symndx] > 0) - local_got_refcounts[r_symndx] -= 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_PC8: - case R_X86_64_PC16: - case R_X86_64_PC32: - if (info->shared) - break; - /* Fall thru */ - - case R_X86_64_PLT32: - if (h != NULL) - { - 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 bfd_boolean -elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info, - struct elf_link_hash_entry *h) -{ - struct elf64_x86_64_link_hash_table *htab; - asection *s; - unsigned int power_of_two; - - /* 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 (h->plt.refcount <= 0 - || SYMBOL_CALLS_LOCAL (info, h) - || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT - && h->root.type == bfd_link_hash_undefweak)) - { - /* 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; - } - else - /* It's possible that we incorrectly decided a .plt reloc was - needed for an R_X86_64_PC32 reloc to a non-function sym in - check_relocs. We can't decide accurately between function and - non-function syms in check-relocs; Objects loaded later in - the link may change h->type. So fix it now. */ - h->plt.offset = (bfd_vma) -1; - - /* 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; - if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) - h->elf_link_hash_flags - = ((h->elf_link_hash_flags & ~ELF_LINK_NON_GOT_REF) - | (h->weakdef->elf_link_hash_flags & ELF_LINK_NON_GOT_REF)); - 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; - - /* If -z nocopyreloc was given, we won't generate them either. */ - if (info->nocopyreloc) - { - h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; - return TRUE; - } - - if (ELIMINATE_COPY_RELOCS) - { - struct elf64_x86_64_link_hash_entry * eh; - struct elf64_x86_64_dyn_relocs *p; - - eh = (struct elf64_x86_64_link_hash_entry *) h; - for (p = eh->dyn_relocs; p != NULL; p = p->next) - { - s = p->sec->output_section; - if (s != NULL && (s->flags & SEC_READONLY) != 0) - break; - } - - /* If we didn't find any dynamic relocs in read-only sections, then - we'll be keeping the dynamic relocs and avoiding the copy reloc. */ - if (p == NULL) - { - h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; - 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. */ - - htab = elf64_x86_64_hash_table (info); - - /* 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. */ - if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) - { - htab->srelbss->_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 = htab->sdynbss; - s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two)); - if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) - { - if (! bfd_set_section_alignment (htab->elf.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; -} - -/* Allocate space in .plt, .got and associated reloc sections for - dynamic relocs. */ - -static bfd_boolean -allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) -{ - struct bfd_link_info *info; - struct elf64_x86_64_link_hash_table *htab; - struct elf64_x86_64_link_hash_entry *eh; - struct elf64_x86_64_dyn_relocs *p; - - if (h->root.type == bfd_link_hash_indirect) - return TRUE; - - if (h->root.type == bfd_link_hash_warning) - h = (struct elf_link_hash_entry *) h->root.u.i.link; - - info = (struct bfd_link_info *) inf; - htab = elf64_x86_64_hash_table (info); - - if (htab->elf.dynamic_sections_created - && h->plt.refcount > 0) - { - /* Make sure this symbol is output as a dynamic symbol. - Undefined weak syms won't yet be marked as dynamic. */ - if (h->dynindx == -1 - && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) - { - if (! bfd_elf_link_record_dynamic_symbol (info, h)) - return FALSE; - } - - if (info->shared - || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) - { - asection *s = htab->splt; - - /* 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; - - h->plt.offset = s->_raw_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 = h->plt.offset; - } - - /* 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. */ - htab->sgotplt->_raw_size += GOT_ENTRY_SIZE; - - /* We also need to make an entry in the .rela.plt section. */ - htab->srelplt->_raw_size += sizeof (Elf64_External_Rela); - } - else - { - h->plt.offset = (bfd_vma) -1; - h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; - } - } - else - { - h->plt.offset = (bfd_vma) -1; - h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; - } - - /* If R_X86_64_GOTTPOFF symbol is now local to the binary, - make it a R_X86_64_TPOFF32 requiring no GOT entry. */ - if (h->got.refcount > 0 - && !info->shared - && h->dynindx == -1 - && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE) - h->got.offset = (bfd_vma) -1; - else if (h->got.refcount > 0) - { - asection *s; - bfd_boolean dyn; - int tls_type = elf64_x86_64_hash_entry (h)->tls_type; - - /* Make sure this symbol is output as a dynamic symbol. - Undefined weak syms won't yet be marked as dynamic. */ - if (h->dynindx == -1 - && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) - { - if (! bfd_elf_link_record_dynamic_symbol (info, h)) - return FALSE; - } - - s = htab->sgot; - h->got.offset = s->_raw_size; - s->_raw_size += GOT_ENTRY_SIZE; - /* R_X86_64_TLSGD needs 2 consecutive GOT slots. */ - if (tls_type == GOT_TLS_GD) - s->_raw_size += GOT_ENTRY_SIZE; - dyn = htab->elf.dynamic_sections_created; - /* R_X86_64_TLSGD needs one dynamic relocation if local symbol - and two if global. - R_X86_64_GOTTPOFF needs one dynamic relocation. */ - if ((tls_type == GOT_TLS_GD && h->dynindx == -1) - || tls_type == GOT_TLS_IE) - htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); - else if (tls_type == GOT_TLS_GD) - htab->srelgot->_raw_size += 2 * sizeof (Elf64_External_Rela); - else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT - || h->root.type != bfd_link_hash_undefweak) - && (info->shared - || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) - htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); - } - else - h->got.offset = (bfd_vma) -1; - - eh = (struct elf64_x86_64_link_hash_entry *) h; - if (eh->dyn_relocs == NULL) - return TRUE; - - /* In the shared -Bsymbolic case, discard space allocated for - dynamic pc-relative relocs against symbols which turn out to be - defined in regular objects. For the normal shared case, discard - space for pc-relative relocs that have become local due to symbol - visibility changes. */ - - if (info->shared) - { - /* Relocs that use pc_count are those that appear on a call - insn, or certain REL relocs that can generated via assembly. - We want calls to protected symbols to resolve directly to the - function rather than going via the plt. If people want - function pointer comparisons to work as expected then they - should avoid writing weird assembly. */ - if (SYMBOL_CALLS_LOCAL (info, h)) - { - struct elf64_x86_64_dyn_relocs **pp; - - for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) - { - p->count -= p->pc_count; - p->pc_count = 0; - if (p->count == 0) - *pp = p->next; - else - pp = &p->next; - } - } - - /* Also discard relocs on undefined weak syms with non-default - visibility. */ - if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT - && h->root.type == bfd_link_hash_undefweak) - eh->dyn_relocs = NULL; - } - else if (ELIMINATE_COPY_RELOCS) - { - /* For the non-shared case, discard space for relocs against - symbols which turn out to need copy relocs or are not - dynamic. */ - - if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 - && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 - && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) - || (htab->elf.dynamic_sections_created - && (h->root.type == bfd_link_hash_undefweak - || h->root.type == bfd_link_hash_undefined)))) - { - /* Make sure this symbol is output as a dynamic symbol. - Undefined weak syms won't yet be marked as dynamic. */ - if (h->dynindx == -1 - && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) - { - if (! bfd_elf_link_record_dynamic_symbol (info, h)) - return FALSE; - } - - /* If that succeeded, we know we'll be keeping all the - relocs. */ - if (h->dynindx != -1) - goto keep; - } - - eh->dyn_relocs = NULL; - - keep: ; - } - - /* Finally, allocate space. */ - for (p = eh->dyn_relocs; p != NULL; p = p->next) - { - asection *sreloc = elf_section_data (p->sec)->sreloc; - sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela); - } - - return TRUE; -} - -/* Find any dynamic relocs that apply to read-only sections. */ - -static bfd_boolean -readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf) -{ - struct elf64_x86_64_link_hash_entry *eh; - struct elf64_x86_64_dyn_relocs *p; - - if (h->root.type == bfd_link_hash_warning) - h = (struct elf_link_hash_entry *) h->root.u.i.link; - - eh = (struct elf64_x86_64_link_hash_entry *) h; - for (p = eh->dyn_relocs; p != NULL; p = p->next) - { - asection *s = p->sec->output_section; - - if (s != NULL && (s->flags & SEC_READONLY) != 0) - { - struct bfd_link_info *info = (struct bfd_link_info *) inf; - - info->flags |= DF_TEXTREL; - - /* Not an error, just cut short the traversal. */ - return FALSE; - } - } - return TRUE; -} - -/* Set the sizes of the dynamic sections. */ - -static bfd_boolean -elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, - struct bfd_link_info *info) -{ - struct elf64_x86_64_link_hash_table *htab; - bfd *dynobj; - asection *s; - bfd_boolean relocs; - bfd *ibfd; - - htab = elf64_x86_64_hash_table (info); - dynobj = htab->elf.dynobj; - if (dynobj == NULL) - abort (); - - if (htab->elf.dynamic_sections_created) - { - /* Set the contents of the .interp section to the interpreter. */ - if (info->executable) - { - s = bfd_get_section_by_name (dynobj, ".interp"); - if (s == NULL) - abort (); - s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; - s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; - } - } - - /* Set up .got offsets for local syms, and space for local dynamic - relocs. */ - for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) - { - bfd_signed_vma *local_got; - bfd_signed_vma *end_local_got; - char *local_tls_type; - bfd_size_type locsymcount; - Elf_Internal_Shdr *symtab_hdr; - asection *srel; - - if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) - continue; - - for (s = ibfd->sections; s != NULL; s = s->next) - { - struct elf64_x86_64_dyn_relocs *p; - - for (p = *((struct elf64_x86_64_dyn_relocs **) - &elf_section_data (s)->local_dynrel); - p != NULL; - p = p->next) - { - if (!bfd_is_abs_section (p->sec) - && bfd_is_abs_section (p->sec->output_section)) - { - /* Input section has been discarded, either because - it is a copy of a linkonce section or due to - linker script /DISCARD/, so we'll be discarding - the relocs too. */ - } - else if (p->count != 0) - { - srel = elf_section_data (p->sec)->sreloc; - srel->_raw_size += p->count * sizeof (Elf64_External_Rela); - if ((p->sec->output_section->flags & SEC_READONLY) != 0) - info->flags |= DF_TEXTREL; - - } - } - } - - local_got = elf_local_got_refcounts (ibfd); - if (!local_got) - continue; - - symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; - locsymcount = symtab_hdr->sh_info; - end_local_got = local_got + locsymcount; - local_tls_type = elf64_x86_64_local_got_tls_type (ibfd); - s = htab->sgot; - srel = htab->srelgot; - for (; local_got < end_local_got; ++local_got, ++local_tls_type) - { - if (*local_got > 0) - { - *local_got = s->_raw_size; - s->_raw_size += GOT_ENTRY_SIZE; - if (*local_tls_type == GOT_TLS_GD) - s->_raw_size += GOT_ENTRY_SIZE; - if (info->shared - || *local_tls_type == GOT_TLS_GD - || *local_tls_type == GOT_TLS_IE) - srel->_raw_size += sizeof (Elf64_External_Rela); - } - else - *local_got = (bfd_vma) -1; - } - } - - if (htab->tls_ld_got.refcount > 0) - { - /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD - relocs. */ - htab->tls_ld_got.offset = htab->sgot->_raw_size; - htab->sgot->_raw_size += 2 * GOT_ENTRY_SIZE; - htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); - } - else - htab->tls_ld_got.offset = -1; - - /* Allocate global sym .plt and .got entries, and space for global - sym dynamic relocs. */ - elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); - - /* We now have determined the sizes of the various dynamic sections. - Allocate memory for them. */ - relocs = FALSE; - for (s = dynobj->sections; s != NULL; s = s->next) - { - if ((s->flags & SEC_LINKER_CREATED) == 0) - continue; - - if (s == htab->splt - || s == htab->sgot - || s == htab->sgotplt) - { - /* Strip this section if we don't need it; see the - comment below. */ - } - else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) - { - if (s->_raw_size != 0 && s != htab->srelplt) - relocs = 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 - { - /* It's not one of our sections, so don't allocate space. */ - continue; - } - - 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. */ - - _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) - return FALSE; - } - - if (htab->elf.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. */ -#define add_dynamic_entry(TAG, VAL) \ - _bfd_elf_add_dynamic_entry (info, TAG, VAL) - - if (info->executable) - { - if (!add_dynamic_entry (DT_DEBUG, 0)) - return FALSE; - } - - if (htab->splt->_raw_size != 0) - { - if (!add_dynamic_entry (DT_PLTGOT, 0) - || !add_dynamic_entry (DT_PLTRELSZ, 0) - || !add_dynamic_entry (DT_PLTREL, DT_RELA) - || !add_dynamic_entry (DT_JMPREL, 0)) - return FALSE; - } - - if (relocs) - { - if (!add_dynamic_entry (DT_RELA, 0) - || !add_dynamic_entry (DT_RELASZ, 0) - || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) - return FALSE; - - /* If any dynamic relocs apply to a read-only section, - then we need a DT_TEXTREL entry. */ - if ((info->flags & DF_TEXTREL) == 0) - elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, - (PTR) info); - - if ((info->flags & DF_TEXTREL) != 0) - { - if (!add_dynamic_entry (DT_TEXTREL, 0)) - return FALSE; - } - } - } -#undef add_dynamic_entry - - return TRUE; -} - -/* Return the base VMA address which should be subtracted from real addresses - when resolving @dtpoff relocation. - This is PT_TLS segment p_vaddr. */ - -static bfd_vma -dtpoff_base (struct bfd_link_info *info) -{ - /* If tls_sec is NULL, we should have signalled an error already. */ - if (elf_hash_table (info)->tls_sec == NULL) - return 0; - return elf_hash_table (info)->tls_sec->vma; -} - -/* Return the relocation value for @tpoff relocation - if STT_TLS virtual address is ADDRESS. */ - -static bfd_vma -tpoff (struct bfd_link_info *info, bfd_vma address) -{ - struct elf_link_hash_table *htab = elf_hash_table (info); - - /* If tls_segment is NULL, we should have signalled an error already. */ - if (htab->tls_sec == NULL) - return 0; - return address - htab->tls_size - htab->tls_sec->vma; -} - -/* Relocate an x86_64 ELF section. */ - -static bfd_boolean -elf64_x86_64_relocate_section (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) -{ - struct elf64_x86_64_link_hash_table *htab; - Elf_Internal_Shdr *symtab_hdr; - struct elf_link_hash_entry **sym_hashes; - bfd_vma *local_got_offsets; - Elf_Internal_Rela *rel; - Elf_Internal_Rela *relend; - - if (info->relocatable) - return TRUE; - - htab = elf64_x86_64_hash_table (info); - symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; - sym_hashes = elf_sym_hashes (input_bfd); - local_got_offsets = elf_local_got_offsets (input_bfd); - - rel = relocs; - relend = relocs + input_section->reloc_count; - for (; rel < relend; rel++) - { - unsigned 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 off; - bfd_vma relocation; - bfd_boolean unresolved_reloc; - bfd_reloc_status_type r; - int tls_type; - - r_type = ELF64_R_TYPE (rel->r_info); - if (r_type == (int) R_X86_64_GNU_VTINHERIT - || r_type == (int) R_X86_64_GNU_VTENTRY) - continue; - - if (r_type >= R_X86_64_max) - { - bfd_set_error (bfd_error_bad_value); - return FALSE; - } - - howto = x86_64_elf_howto_table + r_type; - r_symndx = ELF64_R_SYM (rel->r_info); - h = NULL; - sym = NULL; - sec = NULL; - unresolved_reloc = FALSE; - if (r_symndx < symtab_hdr->sh_info) - { - sym = local_syms + r_symndx; - sec = local_sections[r_symndx]; - - relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); - } - else - { - bfd_boolean warned; - - RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, - r_symndx, symtab_hdr, sym_hashes, - h, sec, relocation, - unresolved_reloc, warned); - } - /* 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. */ - if (htab->sgot == NULL) - abort (); - - if (h != NULL) - { - bfd_boolean dyn; - - off = h->got.offset; - dyn = htab->elf.dynamic_sections_created; - - if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) - || (info->shared - && SYMBOL_REFERENCES_LOCAL (info, h)) - || (ELF_ST_VISIBILITY (h->other) - && h->root.type == bfd_link_hash_undefweak)) - { - /* 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, - htab->sgot->contents + off); - h->got.offset |= 1; - } - } - else - unresolved_reloc = FALSE; - } - else - { - if (local_got_offsets == NULL) - abort (); - - 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, - htab->sgot->contents + off); - - if (info->shared) - { - asection *s; - Elf_Internal_Rela outrel; - bfd_byte *loc; - - /* We need to generate a R_X86_64_RELATIVE reloc - for the dynamic linker. */ - s = htab->srelgot; - if (s == NULL) - abort (); - - outrel.r_offset = (htab->sgot->output_section->vma - + htab->sgot->output_offset - + off); - outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); - outrel.r_addend = relocation; - loc = s->contents; - loc += s->reloc_count++ * sizeof (Elf64_External_Rela); - bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); - } - - local_got_offsets[r_symndx] |= 1; - } - } - - if (off >= (bfd_vma) -2) - abort (); - - relocation = htab->sgot->output_offset + off; - if (r_type == R_X86_64_GOTPCREL) - relocation += htab->sgot->output_section->vma; - - 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 - || htab->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 = (htab->splt->output_section->vma - + htab->splt->output_offset - + h->plt.offset); - unresolved_reloc = FALSE; - break; - - case R_X86_64_PC8: - case R_X86_64_PC16: - case R_X86_64_PC32: - 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. */ - - /* r_symndx will be zero only for relocs against symbols - from removed linkonce sections, or sections discarded by - a linker script. */ - if (r_symndx == 0 - || (input_section->flags & SEC_ALLOC) == 0) - break; - - if ((info->shared - && (h == NULL - || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT - || h->root.type != bfd_link_hash_undefweak) - && ((r_type != R_X86_64_PC8 - && r_type != R_X86_64_PC16 - && r_type != R_X86_64_PC32) - || !SYMBOL_CALLS_LOCAL (info, h))) - || (ELIMINATE_COPY_RELOCS - && !info->shared - && h != NULL - && h->dynindx != -1 - && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 - && (((h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_DYNAMIC) != 0 - && (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0) - || h->root.type == bfd_link_hash_undefweak - || h->root.type == bfd_link_hash_undefined))) - { - Elf_Internal_Rela outrel; - bfd_byte *loc; - bfd_boolean skip, relocate; - asection *sreloc; - - /* When generating a shared object, these relocations - are copied into the output file to be resolved at run - time. */ - skip = FALSE; - relocate = FALSE; - - outrel.r_offset = - _bfd_elf_section_offset (output_bfd, info, input_section, - rel->r_offset); - if (outrel.r_offset == (bfd_vma) -1) - skip = TRUE; - else if (outrel.r_offset == (bfd_vma) -2) - skip = TRUE, relocate = TRUE; - - outrel.r_offset += (input_section->output_section->vma - + input_section->output_offset); - - if (skip) - memset (&outrel, 0, sizeof outrel); - - /* h->dynindx may be -1 if this symbol was marked to - become local. */ - else if (h != NULL - && h->dynindx != -1 - && (r_type == R_X86_64_PC8 - || r_type == R_X86_64_PC16 - || r_type == R_X86_64_PC32 - || !info->shared - || !info->symbolic - || (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0)) - { - outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); - outrel.r_addend = rel->r_addend; - } - else - { - /* This symbol is local, or marked to become local. */ - if (r_type == R_X86_64_64) - { - relocate = TRUE; - outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); - outrel.r_addend = relocation + rel->r_addend; - } - else - { - long sindx; - - if (bfd_is_abs_section (sec)) - sindx = 0; - else if (sec == NULL || sec->owner == NULL) - { - bfd_set_error (bfd_error_bad_value); - return FALSE; - } - else - { - asection *osec; - - osec = sec->output_section; - sindx = elf_section_data (osec)->dynindx; - BFD_ASSERT (sindx > 0); - } - - outrel.r_info = ELF64_R_INFO (sindx, r_type); - outrel.r_addend = relocation + rel->r_addend; - } - } - - sreloc = elf_section_data (input_section)->sreloc; - if (sreloc == NULL) - abort (); - - loc = sreloc->contents; - loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); - bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); - - /* 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; - - case R_X86_64_TLSGD: - case R_X86_64_GOTTPOFF: - r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL); - tls_type = GOT_UNKNOWN; - if (h == NULL && local_got_offsets) - tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx]; - else if (h != NULL) - { - tls_type = elf64_x86_64_hash_entry (h)->tls_type; - if (!info->shared && h->dynindx == -1 && tls_type == GOT_TLS_IE) - r_type = R_X86_64_TPOFF32; - } - if (r_type == R_X86_64_TLSGD) - { - if (tls_type == GOT_TLS_IE) - r_type = R_X86_64_GOTTPOFF; - } - - if (r_type == R_X86_64_TPOFF32) - { - BFD_ASSERT (! unresolved_reloc); - if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD) - { - unsigned int i; - static unsigned char tlsgd[8] - = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 }; - - /* GD->LE transition. - .byte 0x66; leaq foo@tlsgd(%rip), %rdi - .word 0x6666; rex64; call __tls_get_addr@plt - Change it into: - movq %fs:0, %rax - leaq foo@tpoff(%rax), %rax */ - BFD_ASSERT (rel->r_offset >= 4); - for (i = 0; i < 4; i++) - BFD_ASSERT (bfd_get_8 (input_bfd, - contents + rel->r_offset - 4 + i) - == tlsgd[i]); - BFD_ASSERT (rel->r_offset + 12 <= input_section->_raw_size); - for (i = 0; i < 4; i++) - BFD_ASSERT (bfd_get_8 (input_bfd, - contents + rel->r_offset + 4 + i) - == tlsgd[i+4]); - BFD_ASSERT (rel + 1 < relend); - BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); - memcpy (contents + rel->r_offset - 4, - "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", - 16); - bfd_put_32 (output_bfd, tpoff (info, relocation), - contents + rel->r_offset + 8); - /* Skip R_X86_64_PLT32. */ - rel++; - continue; - } - else - { - unsigned int val, type, reg; - - /* IE->LE transition: - Originally it can be one of: - movq foo@gottpoff(%rip), %reg - addq foo@gottpoff(%rip), %reg - We change it into: - movq $foo, %reg - leaq foo(%reg), %reg - addq $foo, %reg. */ - BFD_ASSERT (rel->r_offset >= 3); - val = bfd_get_8 (input_bfd, contents + rel->r_offset - 3); - BFD_ASSERT (val == 0x48 || val == 0x4c); - type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); - BFD_ASSERT (type == 0x8b || type == 0x03); - reg = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); - BFD_ASSERT ((reg & 0xc7) == 5); - reg >>= 3; - BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size); - if (type == 0x8b) - { - /* movq */ - if (val == 0x4c) - bfd_put_8 (output_bfd, 0x49, - contents + rel->r_offset - 3); - bfd_put_8 (output_bfd, 0xc7, - contents + rel->r_offset - 2); - bfd_put_8 (output_bfd, 0xc0 | reg, - contents + rel->r_offset - 1); - } - else if (reg == 4) - { - /* addq -> addq - addressing with %rsp/%r12 is - special */ - if (val == 0x4c) - bfd_put_8 (output_bfd, 0x49, - contents + rel->r_offset - 3); - bfd_put_8 (output_bfd, 0x81, - contents + rel->r_offset - 2); - bfd_put_8 (output_bfd, 0xc0 | reg, - contents + rel->r_offset - 1); - } - else - { - /* addq -> leaq */ - if (val == 0x4c) - bfd_put_8 (output_bfd, 0x4d, - contents + rel->r_offset - 3); - bfd_put_8 (output_bfd, 0x8d, - contents + rel->r_offset - 2); - bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), - contents + rel->r_offset - 1); - } - bfd_put_32 (output_bfd, tpoff (info, relocation), - contents + rel->r_offset); - continue; - } - } - - if (htab->sgot == NULL) - abort (); - - if (h != NULL) - off = h->got.offset; - else - { - if (local_got_offsets == NULL) - abort (); - - off = local_got_offsets[r_symndx]; - } - - if ((off & 1) != 0) - off &= ~1; - else - { - Elf_Internal_Rela outrel; - bfd_byte *loc; - int dr_type, indx; - - if (htab->srelgot == NULL) - abort (); - - outrel.r_offset = (htab->sgot->output_section->vma - + htab->sgot->output_offset + off); - - indx = h && h->dynindx != -1 ? h->dynindx : 0; - if (r_type == R_X86_64_TLSGD) - dr_type = R_X86_64_DTPMOD64; - else - dr_type = R_X86_64_TPOFF64; - - bfd_put_64 (output_bfd, 0, htab->sgot->contents + off); - outrel.r_addend = 0; - if (dr_type == R_X86_64_TPOFF64 && indx == 0) - outrel.r_addend = relocation - dtpoff_base (info); - outrel.r_info = ELF64_R_INFO (indx, dr_type); - - loc = htab->srelgot->contents; - loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); - bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); - - if (r_type == R_X86_64_TLSGD) - { - if (indx == 0) - { - BFD_ASSERT (! unresolved_reloc); - bfd_put_64 (output_bfd, - relocation - dtpoff_base (info), - htab->sgot->contents + off + GOT_ENTRY_SIZE); - } - else - { - bfd_put_64 (output_bfd, 0, - htab->sgot->contents + off + GOT_ENTRY_SIZE); - outrel.r_info = ELF64_R_INFO (indx, - R_X86_64_DTPOFF64); - outrel.r_offset += GOT_ENTRY_SIZE; - htab->srelgot->reloc_count++; - loc += sizeof (Elf64_External_Rela); - bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); - } - } - - if (h != NULL) - h->got.offset |= 1; - else - local_got_offsets[r_symndx] |= 1; - } - - if (off >= (bfd_vma) -2) - abort (); - if (r_type == ELF64_R_TYPE (rel->r_info)) - { - relocation = htab->sgot->output_section->vma - + htab->sgot->output_offset + off; - unresolved_reloc = FALSE; - } - else - { - unsigned int i; - static unsigned char tlsgd[8] - = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 }; - - /* GD->IE transition. - .byte 0x66; leaq foo@tlsgd(%rip), %rdi - .word 0x6666; rex64; call __tls_get_addr@plt - Change it into: - movq %fs:0, %rax - addq foo@gottpoff(%rip), %rax */ - BFD_ASSERT (rel->r_offset >= 4); - for (i = 0; i < 4; i++) - BFD_ASSERT (bfd_get_8 (input_bfd, - contents + rel->r_offset - 4 + i) - == tlsgd[i]); - BFD_ASSERT (rel->r_offset + 12 <= input_section->_raw_size); - for (i = 0; i < 4; i++) - BFD_ASSERT (bfd_get_8 (input_bfd, - contents + rel->r_offset + 4 + i) - == tlsgd[i+4]); - BFD_ASSERT (rel + 1 < relend); - BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); - memcpy (contents + rel->r_offset - 4, - "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", - 16); - - relocation = (htab->sgot->output_section->vma - + htab->sgot->output_offset + off - - rel->r_offset - - input_section->output_section->vma - - input_section->output_offset - - 12); - bfd_put_32 (output_bfd, relocation, - contents + rel->r_offset + 8); - /* Skip R_X86_64_PLT32. */ - rel++; - continue; - } - break; - - case R_X86_64_TLSLD: - if (! info->shared) - { - /* LD->LE transition: - Ensure it is: - leaq foo@tlsld(%rip), %rdi; call __tls_get_addr@plt. - We change it into: - .word 0x6666; .byte 0x66; movl %fs:0, %rax. */ - BFD_ASSERT (rel->r_offset >= 3); - BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 3) - == 0x48); - BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2) - == 0x8d); - BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 1) - == 0x3d); - BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size); - BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) - == 0xe8); - BFD_ASSERT (rel + 1 < relend); - BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); - memcpy (contents + rel->r_offset - 3, - "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); - /* Skip R_X86_64_PLT32. */ - rel++; - continue; - } - - if (htab->sgot == NULL) - abort (); - - off = htab->tls_ld_got.offset; - if (off & 1) - off &= ~1; - else - { - Elf_Internal_Rela outrel; - bfd_byte *loc; - - if (htab->srelgot == NULL) - abort (); - - outrel.r_offset = (htab->sgot->output_section->vma - + htab->sgot->output_offset + off); - - bfd_put_64 (output_bfd, 0, - htab->sgot->contents + off); - bfd_put_64 (output_bfd, 0, - htab->sgot->contents + off + GOT_ENTRY_SIZE); - outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64); - outrel.r_addend = 0; - loc = htab->srelgot->contents; - loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); - bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); - htab->tls_ld_got.offset |= 1; - } - relocation = htab->sgot->output_section->vma - + htab->sgot->output_offset + off; - unresolved_reloc = FALSE; - break; - - case R_X86_64_DTPOFF32: - if (info->shared || (input_section->flags & SEC_CODE) == 0) - relocation -= dtpoff_base (info); - else - relocation = tpoff (info, relocation); - break; - - case R_X86_64_TPOFF32: - BFD_ASSERT (! info->shared); - relocation = tpoff (info, relocation); - break; - - default: - break; - } - - /* Dynamic relocs are not propagated for SEC_DEBUGGING sections - because such sections are not SEC_ALLOC and thus ld.so will - not process them. */ - if (unresolved_reloc - && !((input_section->flags & SEC_DEBUGGING) != 0 - && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) - (*_bfd_error_handler) - (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), - bfd_archive_filename (input_bfd), - bfd_get_section_name (input_bfd, input_section), - (long) rel->r_offset, - h->root.root.string); - - r = _bfd_final_link_relocate (howto, input_bfd, input_section, - contents, rel->r_offset, - relocation, rel->r_addend); - - if (r != bfd_reloc_ok) - { - 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 (r == bfd_reloc_overflow) - { - - if (! ((*info->callbacks->reloc_overflow) - (info, name, howto->name, (bfd_vma) 0, - input_bfd, input_section, rel->r_offset))) - return FALSE; - } - else - { - (*_bfd_error_handler) - (_("%s(%s+0x%lx): reloc against `%s': error %d"), - bfd_archive_filename (input_bfd), - bfd_get_section_name (input_bfd, input_section), - (long) rel->r_offset, name, (int) r); - return FALSE; - } - } - } - - return TRUE; -} - -/* Finish up dynamic symbol handling. We set the contents of various - dynamic sections here. */ - -static bfd_boolean -elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd, - struct bfd_link_info *info, - struct elf_link_hash_entry *h, - Elf_Internal_Sym *sym) -{ - struct elf64_x86_64_link_hash_table *htab; - - htab = elf64_x86_64_hash_table (info); - - if (h->plt.offset != (bfd_vma) -1) - { - bfd_vma plt_index; - bfd_vma got_offset; - Elf_Internal_Rela rela; - bfd_byte *loc; - - /* This symbol has an entry in the procedure linkage table. Set - it up. */ - if (h->dynindx == -1 - || htab->splt == NULL - || htab->sgotplt == NULL - || htab->srelplt == NULL) - abort (); - - /* 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 (htab->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, - (htab->sgotplt->output_section->vma - + htab->sgotplt->output_offset - + got_offset - - htab->splt->output_section->vma - - htab->splt->output_offset - - h->plt.offset - - 6), - htab->splt->contents + h->plt.offset + 2); - /* Put relocation index. */ - bfd_put_32 (output_bfd, plt_index, - htab->splt->contents + h->plt.offset + 7); - /* Put offset for jmp .PLT0. */ - bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), - htab->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, (htab->splt->output_section->vma - + htab->splt->output_offset - + h->plt.offset + 6), - htab->sgotplt->contents + got_offset); - - /* Fill in the entry in the .rela.plt section. */ - rela.r_offset = (htab->sgotplt->output_section->vma - + htab->sgotplt->output_offset - + got_offset); - rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT); - rela.r_addend = 0; - loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela); - bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); - - 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. This is a clue - for the dynamic linker, to make function pointer - comparisons work between an application and shared - library. */ - sym->st_shndx = SHN_UNDEF; - } - } - - if (h->got.offset != (bfd_vma) -1 - && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_GD - && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE) - { - Elf_Internal_Rela rela; - bfd_byte *loc; - - /* This symbol has an entry in the global offset table. Set it - up. */ - if (htab->sgot == NULL || htab->srelgot == NULL) - abort (); - - rela.r_offset = (htab->sgot->output_section->vma - + htab->sgot->output_offset - + (h->got.offset &~ (bfd_vma) 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 (info->shared - && SYMBOL_REFERENCES_LOCAL (info, h)) - { - 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, - htab->sgot->contents + h->got.offset); - rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT); - rela.r_addend = 0; - } - - loc = htab->srelgot->contents; - loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); - bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); - } - - if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) - { - Elf_Internal_Rela rela; - bfd_byte *loc; - - /* This symbol needs a copy reloc. Set it up. */ - - if (h->dynindx == -1 - || (h->root.type != bfd_link_hash_defined - && h->root.type != bfd_link_hash_defweak) - || htab->srelbss == NULL) - abort (); - - 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; - loc = htab->srelbss->contents; - loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela); - bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); - } - - /* 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; -} - -/* Used to decide how to sort relocs in an optimal manner for the - dynamic linker, before writing them out. */ - -static enum elf_reloc_type_class -elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela) -{ - switch ((int) ELF64_R_TYPE (rela->r_info)) - { - case R_X86_64_RELATIVE: - return reloc_class_relative; - case R_X86_64_JUMP_SLOT: - return reloc_class_plt; - case R_X86_64_COPY: - return reloc_class_copy; - default: - return reloc_class_normal; - } -} - -/* Finish up the dynamic sections. */ - -static bfd_boolean -elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) -{ - struct elf64_x86_64_link_hash_table *htab; - bfd *dynobj; - asection *sdyn; - - htab = elf64_x86_64_hash_table (info); - dynobj = htab->elf.dynobj; - sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); - - if (htab->elf.dynamic_sections_created) - { - Elf64_External_Dyn *dyncon, *dynconend; - - if (sdyn == NULL || htab->sgot == NULL) - abort (); - - dyncon = (Elf64_External_Dyn *) sdyn->contents; - dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size); - for (; dyncon < dynconend; dyncon++) - { - Elf_Internal_Dyn dyn; - asection *s; - - bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); - - switch (dyn.d_tag) - { - default: - continue; - - case DT_PLTGOT: - dyn.d_un.d_ptr = htab->sgot->output_section->vma; - break; - - case DT_JMPREL: - dyn.d_un.d_ptr = htab->srelplt->output_section->vma; - break; - - case DT_PLTRELSZ: - s = htab->srelplt->output_section; - if (s->_cooked_size != 0) - dyn.d_un.d_val = s->_cooked_size; - else - dyn.d_un.d_val = s->_raw_size; - break; - - case DT_RELASZ: - /* The procedure linkage table relocs (DT_JMPREL) should - not be included in the overall relocs (DT_RELA). - Therefore, we override the DT_RELASZ entry here to - make it not include the JMPREL relocs. Since the - linker script arranges for .rela.plt to follow all - other relocation sections, we don't have to worry - about changing the DT_RELA entry. */ - if (htab->srelplt != NULL) - { - s = htab->srelplt->output_section; - if (s->_cooked_size != 0) - dyn.d_un.d_val -= s->_cooked_size; - else - dyn.d_un.d_val -= s->_raw_size; - } - break; - } - - bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); - } - - /* Fill in the special first entry in the procedure linkage table. */ - if (htab->splt && htab->splt->_raw_size > 0) - { - /* Fill in the first entry in the procedure linkage table. */ - memcpy (htab->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, - (htab->sgotplt->output_section->vma - + htab->sgotplt->output_offset - + 8 - - htab->splt->output_section->vma - - htab->splt->output_offset - - 6), - htab->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, - (htab->sgotplt->output_section->vma - + htab->sgotplt->output_offset - + 16 - - htab->splt->output_section->vma - - htab->splt->output_offset - - 12), - htab->splt->contents + 8); - - elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize = - PLT_ENTRY_SIZE; - } - } - - if (htab->sgotplt) - { - /* Fill in the first three entries in the global offset table. */ - if (htab->sgotplt->_raw_size > 0) - { - /* Set the first entry in the global offset table to the address of - the dynamic section. */ - if (sdyn == NULL) - bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents); - else - bfd_put_64 (output_bfd, - sdyn->output_section->vma + sdyn->output_offset, - htab->sgotplt->contents); - /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ - bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE); - bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2); - } - - elf_section_data (htab->sgotplt->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_can_refcount 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_rela_normal 1 - -#define elf_info_to_howto elf64_x86_64_info_to_howto - -#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_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol -#define elf_backend_create_dynamic_sections elf64_x86_64_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_grok_prstatus elf64_x86_64_grok_prstatus -#define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo -#define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class -#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 -#define bfd_elf64_mkobject elf64_x86_64_mkobject - -#include "elf64-target.h" |