mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-03 04:12:10 +08:00
07d6d2b834
Binutils is supposed to use tabs. In my git config I have whitespace = indent-with-non-tab,space-before-tab,trailing-space and I got annoyed enough seeing red in "git diff" output to fix the problems. * doc/header.sed: Trim trailing space when splitting lines. * aix386-core.c, * aout-adobe.c, * aout-arm.c, * aout-cris.c, * aout-ns32k.c, * aout-target.h, * aout-tic30.c, * aoutf1.h, * aoutx.h, * arc-got.h, * arc-plt.def, * arc-plt.h, * archive.c, * archive64.c, * archures.c, * armnetbsd.c, * bfd-in.h, * bfd.c, * bfdio.c, * binary.c, * bout.c, * cache.c, * cisco-core.c, * coff-alpha.c, * coff-apollo.c, * coff-arm.c, * coff-h8300.c, * coff-i386.c, * coff-i860.c, * coff-i960.c, * coff-m68k.c, * coff-m88k.c, * coff-mcore.c, * coff-mips.c, * coff-ppc.c, * coff-rs6000.c, * coff-sh.c, * coff-stgo32.c, * coff-tic4x.c, * coff-tic54x.c, * coff-tic80.c, * coff-we32k.c, * coff-x86_64.c, * coff-z80.c, * coff-z8k.c, * coff64-rs6000.c, * coffcode.h, * coffgen.c, * cofflink.c, * coffswap.h, * compress.c, * corefile.c, * cpu-alpha.c, * cpu-arm.c, * cpu-avr.c, * cpu-bfin.c, * cpu-cr16.c, * cpu-cr16c.c, * cpu-crx.c, * cpu-d10v.c, * cpu-frv.c, * cpu-ft32.c, * cpu-i370.c, * cpu-i960.c, * cpu-ia64-opc.c, * cpu-ip2k.c, * cpu-lm32.c, * cpu-m32r.c, * cpu-mcore.c, * cpu-microblaze.c, * cpu-mips.c, * cpu-moxie.c, * cpu-mt.c, * cpu-nios2.c, * cpu-ns32k.c, * cpu-or1k.c, * cpu-powerpc.c, * cpu-pru.c, * cpu-sh.c, * cpu-spu.c, * cpu-v850.c, * cpu-v850_rh850.c, * cpu-xgate.c, * cpu-z80.c, * dwarf1.c, * dwarf2.c, * ecoff.c, * ecofflink.c, * ecoffswap.h, * elf-bfd.h, * elf-eh-frame.c, * elf-hppa.h, * elf-m10200.c, * elf-m10300.c, * elf-s390-common.c, * elf-strtab.c, * elf-vxworks.c, * elf.c, * elf32-am33lin.c, * elf32-arc.c, * elf32-arm.c, * elf32-avr.c, * elf32-avr.h, * elf32-bfin.c, * elf32-cr16.c, * elf32-cr16c.c, * elf32-cris.c, * elf32-crx.c, * elf32-d10v.c, * elf32-d30v.c, * elf32-dlx.c, * elf32-epiphany.c, * elf32-fr30.c, * elf32-frv.c, * elf32-ft32.c, * elf32-h8300.c, * elf32-hppa.c, * elf32-i386.c, * elf32-i860.c, * elf32-i960.c, * elf32-ip2k.c, * elf32-lm32.c, * elf32-m32c.c, * elf32-m32r.c, * elf32-m68hc11.c, * elf32-m68hc12.c, * elf32-m68hc1x.c, * elf32-m68hc1x.h, * elf32-m68k.c, * elf32-m88k.c, * elf32-mcore.c, * elf32-mep.c, * elf32-metag.c, * elf32-microblaze.c, * elf32-mips.c, * elf32-moxie.c, * elf32-msp430.c, * elf32-mt.c, * elf32-nds32.c, * elf32-nds32.h, * elf32-nios2.c, * elf32-or1k.c, * elf32-pj.c, * elf32-ppc.c, * elf32-ppc.h, * elf32-pru.c, * elf32-rl78.c, * elf32-rx.c, * elf32-s390.c, * elf32-score.c, * elf32-score.h, * elf32-score7.c, * elf32-sh-symbian.c, * elf32-sh.c, * elf32-sh64.c, * elf32-sparc.c, * elf32-spu.c, * elf32-tic6x.c, * elf32-tilegx.c, * elf32-tilegx.h, * elf32-tilepro.c, * elf32-tilepro.h, * elf32-v850.c, * elf32-vax.c, * elf32-wasm32.c, * elf32-xc16x.c, * elf32-xgate.c, * elf32-xgate.h, * elf32-xstormy16.c, * elf32-xtensa.c, * elf64-alpha.c, * elf64-hppa.c, * elf64-ia64-vms.c, * elf64-mips.c, * elf64-mmix.c, * elf64-ppc.c, * elf64-s390.c, * elf64-sh64.c, * elf64-sparc.c, * elf64-tilegx.c, * elf64-tilegx.h, * elf64-x86-64.c, * elfcore.h, * elflink.c, * elfn32-mips.c, * elfnn-aarch64.c, * elfnn-ia64.c, * elfnn-riscv.c, * elfxx-aarch64.c, * elfxx-aarch64.h, * elfxx-ia64.c, * elfxx-ia64.h, * elfxx-mips.c, * elfxx-riscv.c, * elfxx-sparc.c, * elfxx-tilegx.c, * elfxx-x86.c, * elfxx-x86.h, * freebsd.h, * hash.c, * host-aout.c, * hp300hpux.c, * hppabsd-core.c, * hpux-core.c, * i386aout.c, * i386linux.c, * i386lynx.c, * i386mach3.c, * i386msdos.c, * i386netbsd.c, * ieee.c, * ihex.c, * irix-core.c, * libaout.h, * libbfd-in.h, * libbfd.c, * libcoff-in.h, * libnlm.h, * libpei.h, * libxcoff.h, * linker.c, * lynx-core.c, * m68k4knetbsd.c, * m68klinux.c, * m68knetbsd.c, * m88kmach3.c, * mach-o-aarch64.c, * mach-o-arm.c, * mach-o-i386.c, * mach-o-target.c, * mach-o-x86-64.c, * mach-o.c, * mach-o.h, * merge.c, * mipsbsd.c, * mmo.c, * netbsd.h, * netbsd-core.c, * newsos3.c, * nlm-target.h, * nlm32-ppc.c, * nlm32-sparc.c, * nlmcode.h, * ns32k.h, * ns32knetbsd.c, * oasys.c, * opncls.c, * pc532-mach.c, * pdp11.c, * pe-arm.c, * pe-i386.c, * pe-mcore.c, * pe-mips.c, * pe-x86_64.c, * peXXigen.c, * pef.c, * pef.h, * pei-arm.c, * pei-i386.c, * pei-mcore.c, * pei-x86_64.c, * peicode.h, * plugin.c, * ppcboot.c, * ptrace-core.c, * reloc.c, * riscix.c, * rs6000-core.c, * section.c, * som.c, * som.h, * sparclinux.c, * sparcnetbsd.c, * srec.c, * stabs.c, * sunos.c, * syms.c, * targets.c, * tekhex.c, * trad-core.c, * vax1knetbsd.c, * vaxnetbsd.c, * verilog.c, * versados.c, * vms-alpha.c, * vms-lib.c, * vms-misc.c, * wasm-module.c, * wasm-module.h, * xcofflink.c, * xsym.c, * xsym.h: Whitespace fixes. * bfd-in2.h, * libbfd.h, * libcoff.h: Regenerate.
696 lines
23 KiB
C
696 lines
23 KiB
C
/* x86 specific support for ELF
|
|
Copyright (C) 2017 Free Software Foundation, Inc.
|
|
|
|
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
|
|
MA 02110-1301, USA. */
|
|
|
|
#include "sysdep.h"
|
|
#include "bfd.h"
|
|
#include "bfdlink.h"
|
|
#include "libbfd.h"
|
|
#include "elf-bfd.h"
|
|
#include "bfd_stdint.h"
|
|
#include "hashtab.h"
|
|
|
|
#define PLT_CIE_LENGTH 20
|
|
#define PLT_FDE_LENGTH 36
|
|
#define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
|
|
#define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
|
|
|
|
#define ABI_64_P(abfd) \
|
|
(get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
|
|
|
|
/* 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
|
|
|
|
#define elf_x86_hash_table(p, id) \
|
|
(is_elf_hash_table ((p)->hash) \
|
|
&& elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \
|
|
? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL)
|
|
|
|
/* Will references to this symbol always be local in this object? */
|
|
#define SYMBOL_REFERENCES_LOCAL_P(INFO, H) \
|
|
_bfd_x86_elf_link_symbol_references_local ((INFO), (H))
|
|
|
|
/* TRUE if an undefined weak symbol should be resolved to 0. Local
|
|
undefined weak symbol is always resolved to 0. Reference to an
|
|
undefined weak symbol is resolved to 0 in executable if undefined
|
|
weak symbol should be resolved to 0 (zero_undefweak > 0). */
|
|
#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
|
|
((EH)->elf.root.type == bfd_link_hash_undefweak \
|
|
&& (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf) \
|
|
|| (bfd_link_executable (INFO) \
|
|
&& (EH)->zero_undefweak > 0)))
|
|
|
|
/* Should copy relocation be generated for a symbol. Don't generate
|
|
copy relocation against a protected symbol defined in a shared
|
|
object with GNU_PROPERTY_NO_COPY_ON_PROTECTED. */
|
|
#define SYMBOL_NO_COPYRELOC(INFO, EH) \
|
|
((EH)->def_protected \
|
|
&& ((EH)->elf.root.type == bfd_link_hash_defined \
|
|
|| (EH)->elf.root.type == bfd_link_hash_defweak) \
|
|
&& elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \
|
|
&& ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \
|
|
&& ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0)
|
|
|
|
/* TRUE if dynamic relocation is needed. 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.
|
|
|
|
We also need to generate dynamic pointer relocation against
|
|
STT_GNU_IFUNC symbol in the non-code section. */
|
|
#define NEED_DYNAMIC_RELOCATION_P(INFO, H, SEC, R_TYPE, POINTER_TYPE) \
|
|
((bfd_link_pic (INFO) \
|
|
&& (! X86_PCREL_TYPE_P (R_TYPE) \
|
|
|| ((H) != NULL \
|
|
&& (! (bfd_link_pie (INFO) \
|
|
|| SYMBOLIC_BIND ((INFO), (H))) \
|
|
|| (H)->root.type == bfd_link_hash_defweak \
|
|
|| !(H)->def_regular)))) \
|
|
|| ((H) != NULL \
|
|
&& (H)->type == STT_GNU_IFUNC \
|
|
&& (R_TYPE) == POINTER_TYPE \
|
|
&& ((SEC)->flags & SEC_CODE) == 0) \
|
|
|| (ELIMINATE_COPY_RELOCS \
|
|
&& !bfd_link_pic (INFO) \
|
|
&& (H) != NULL \
|
|
&& ((H)->root.type == bfd_link_hash_defweak \
|
|
|| !(H)->def_regular)))
|
|
|
|
/* TRUE if dynamic relocation should be generated. Don't copy a
|
|
pc-relative relocation into the output file if the symbol needs
|
|
copy reloc or the symbol is undefined when building executable.
|
|
Copy dynamic function pointer relocations. Don't generate dynamic
|
|
relocations against resolved undefined weak symbols in PIE, except
|
|
when PC32_RELOC is TRUE. Undefined weak symbol is bound locally
|
|
when PIC is false. */
|
|
#define GENERATE_DYNAMIC_RELOCATION_P(INFO, EH, R_TYPE, \
|
|
NEED_COPY_RELOC_IN_PIE, \
|
|
RESOLVED_TO_ZERO, PC32_RELOC) \
|
|
((bfd_link_pic (INFO) \
|
|
&& !(NEED_COPY_RELOC_IN_PIE) \
|
|
&& ((EH) == NULL \
|
|
|| ((ELF_ST_VISIBILITY ((EH)->elf.other) == STV_DEFAULT \
|
|
&& (!(RESOLVED_TO_ZERO) || PC32_RELOC)) \
|
|
|| (EH)->elf.root.type != bfd_link_hash_undefweak)) \
|
|
&& ((!X86_PCREL_TYPE_P (R_TYPE) \
|
|
&& !X86_SIZE_TYPE_P (R_TYPE)) \
|
|
|| ! SYMBOL_CALLS_LOCAL ((INFO), &(EH)->elf))) \
|
|
|| (ELIMINATE_COPY_RELOCS \
|
|
&& !bfd_link_pic (INFO) \
|
|
&& (EH) != NULL \
|
|
&& (EH)->elf.dynindx != -1 \
|
|
&& (!(EH)->elf.non_got_ref \
|
|
|| ((EH)->elf.root.type == bfd_link_hash_undefweak \
|
|
&& !(RESOLVED_TO_ZERO))) \
|
|
&& (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \
|
|
|| (EH)->elf.root.type == bfd_link_hash_undefined)))
|
|
|
|
/* TRUE if this input relocation should be copied to output. H->dynindx
|
|
may be -1 if this symbol was marked to become local. */
|
|
#define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \
|
|
((H) != NULL \
|
|
&& (H)->dynindx != -1 \
|
|
&& (X86_PCREL_TYPE_P (R_TYPE) \
|
|
|| !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \
|
|
|| !(H)->def_regular))
|
|
|
|
/* TRUE if 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. */
|
|
#define RESOLVED_LOCALLY_P(INFO, H, HTAB) \
|
|
(!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \
|
|
bfd_link_pic (INFO), (H)) \
|
|
|| (bfd_link_pic (INFO) \
|
|
&& SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \
|
|
|| (ELF_ST_VISIBILITY ((H)->other) \
|
|
&& (H)->root.type == bfd_link_hash_undefweak))
|
|
|
|
/* TRUE if relative relocation should be generated. GOT reference to
|
|
global symbol in PIC will lead to dynamic symbol. It becomes a
|
|
problem when "time" or "times" is defined as a variable in an
|
|
executable, clashing with functions of the same name in libc. If a
|
|
symbol isn't undefined weak symbol, don't make it dynamic in PIC and
|
|
generate relative relocation. */
|
|
#define GENERATE_RELATIVE_RELOC_P(INFO, H) \
|
|
((H)->dynindx == -1 \
|
|
&& !(H)->forced_local \
|
|
&& (H)->root.type != bfd_link_hash_undefweak \
|
|
&& bfd_link_pic (INFO))
|
|
|
|
/* TRUE if this is a pointer reference to a local IFUNC. */
|
|
#define POINTER_LOCAL_IFUNC_P(INFO, H) \
|
|
((H)->dynindx == -1 \
|
|
|| (H)->forced_local \
|
|
|| bfd_link_executable (INFO))
|
|
|
|
/* TRUE if this is a PLT reference to a local IFUNC. */
|
|
#define PLT_LOCAL_IFUNC_P(INFO, H) \
|
|
((H)->dynindx == -1 \
|
|
|| ((bfd_link_executable (INFO) \
|
|
|| ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \
|
|
&& (H)->def_regular \
|
|
&& (H)->type == STT_GNU_IFUNC))
|
|
|
|
/* TRUE if TLS IE->LE transition is OK. */
|
|
#define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \
|
|
(bfd_link_executable (INFO) \
|
|
&& (H) != NULL \
|
|
&& (H)->dynindx == -1 \
|
|
&& (TLS_TYPE & GOT_TLS_IE))
|
|
|
|
/* Verify that the symbol has an entry in the procedure linkage table. */
|
|
#define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \
|
|
do \
|
|
{ \
|
|
if (((H)->dynindx == -1 \
|
|
&& !LOCAL_UNDEFWEAK \
|
|
&& !(((H)->forced_local || bfd_link_executable (INFO)) \
|
|
&& (H)->def_regular \
|
|
&& (H)->type == STT_GNU_IFUNC)) \
|
|
|| (PLT) == NULL \
|
|
|| (GOTPLT) == NULL \
|
|
|| (RELPLT) == NULL) \
|
|
abort (); \
|
|
} \
|
|
while (0);
|
|
|
|
/* Verify that the symbol supports copy relocation. */
|
|
#define VERIFY_COPY_RELOC(H, HTAB) \
|
|
do \
|
|
{ \
|
|
if ((H)->dynindx == -1 \
|
|
|| ((H)->root.type != bfd_link_hash_defined \
|
|
&& (H)->root.type != bfd_link_hash_defweak) \
|
|
|| (HTAB)->elf.srelbss == NULL \
|
|
|| (HTAB)->elf.sreldynrelro == NULL) \
|
|
abort (); \
|
|
} \
|
|
while (0);
|
|
|
|
/* x86 ELF linker hash entry. */
|
|
|
|
struct elf_x86_link_hash_entry
|
|
{
|
|
struct elf_link_hash_entry elf;
|
|
|
|
/* Track dynamic relocs copied for this symbol. */
|
|
struct elf_dyn_relocs *dyn_relocs;
|
|
|
|
unsigned char tls_type;
|
|
|
|
/* Bit 0: Symbol has no GOT nor PLT relocations.
|
|
Bit 1: Symbol has non-GOT/non-PLT relocations in text sections.
|
|
zero_undefweak is initialized to 1 and undefined weak symbol
|
|
should be resolved to 0 if zero_undefweak > 0. */
|
|
unsigned int zero_undefweak : 2;
|
|
|
|
/* Don't call finish_dynamic_symbol on this symbol. */
|
|
unsigned int no_finish_dynamic_symbol : 1;
|
|
|
|
/* TRUE if symbol is __tls_get_addr. */
|
|
unsigned int tls_get_addr : 1;
|
|
|
|
/* TRUE if symbol is defined as a protected symbol. */
|
|
unsigned int def_protected : 1;
|
|
|
|
/* 0: Symbol references are unknown.
|
|
1: Symbol references aren't local.
|
|
2: Symbol references are local.
|
|
*/
|
|
unsigned int local_ref : 2;
|
|
|
|
/* TRUE if symbol is defined by linker. */
|
|
unsigned int linker_def : 1;
|
|
|
|
/* TRUE if symbol is referenced by R_386_GOTOFF relocation. This is
|
|
only used by i386. */
|
|
unsigned int gotoff_ref : 1;
|
|
|
|
/* TRUE if a weak symbol with a real definition needs a copy reloc.
|
|
When there is a weak symbol with a real definition, the processor
|
|
independent code will have arranged for us to see the real
|
|
definition first. We need to copy the needs_copy bit from the
|
|
real definition and check it when allowing copy reloc in PIE. This
|
|
is only used by x86-64. */
|
|
unsigned int needs_copy : 1;
|
|
|
|
/* Information about the GOT PLT entry. Filled when there are both
|
|
GOT and PLT relocations against the same function. */
|
|
union gotplt_union plt_got;
|
|
|
|
/* Information about the second PLT entry. */
|
|
union gotplt_union plt_second;
|
|
|
|
/* Offset of the GOTPLT entry reserved for the TLS descriptor,
|
|
starting at the end of the jump table. */
|
|
bfd_vma tlsdesc_got;
|
|
};
|
|
|
|
struct elf_x86_lazy_plt_layout
|
|
{
|
|
/* The first entry in an absolute lazy procedure linkage table looks
|
|
like this. */
|
|
const bfd_byte *plt0_entry;
|
|
unsigned int plt0_entry_size; /* Size of PLT0 entry. */
|
|
|
|
/* Later entries in an absolute lazy procedure linkage table look
|
|
like this. */
|
|
const bfd_byte *plt_entry;
|
|
unsigned int plt_entry_size; /* Size of each PLT entry. */
|
|
|
|
/* Offsets into plt0_entry that are to be replaced with GOT[1] and
|
|
GOT[2]. */
|
|
unsigned int plt0_got1_offset;
|
|
unsigned int plt0_got2_offset;
|
|
|
|
/* Offset of the end of the PC-relative instruction containing
|
|
plt0_got2_offset. This is for x86-64 only. */
|
|
unsigned int plt0_got2_insn_end;
|
|
|
|
/* Offsets into plt_entry that are to be replaced with... */
|
|
unsigned int plt_got_offset; /* ... address of this symbol in .got. */
|
|
unsigned int plt_reloc_offset; /* ... offset into relocation table. */
|
|
unsigned int plt_plt_offset; /* ... offset to start of .plt. */
|
|
|
|
/* Length of the PC-relative instruction containing plt_got_offset.
|
|
This is used for x86-64 only. */
|
|
unsigned int plt_got_insn_size;
|
|
|
|
/* Offset of the end of the PC-relative jump to plt0_entry. This is
|
|
used for x86-64 only. */
|
|
unsigned int plt_plt_insn_end;
|
|
|
|
/* Offset into plt_entry where the initial value of the GOT entry
|
|
points. */
|
|
unsigned int plt_lazy_offset;
|
|
|
|
/* The first entry in a PIC lazy procedure linkage table looks like
|
|
this. */
|
|
const bfd_byte *pic_plt0_entry;
|
|
|
|
/* Subsequent entries in a PIC lazy procedure linkage table look
|
|
like this. */
|
|
const bfd_byte *pic_plt_entry;
|
|
|
|
/* .eh_frame covering the lazy .plt section. */
|
|
const bfd_byte *eh_frame_plt;
|
|
unsigned int eh_frame_plt_size;
|
|
};
|
|
|
|
struct elf_x86_non_lazy_plt_layout
|
|
{
|
|
/* Entries in an absolute non-lazy procedure linkage table look like
|
|
this. */
|
|
const bfd_byte *plt_entry;
|
|
/* Entries in a PIC non-lazy procedure linkage table look like this. */
|
|
const bfd_byte *pic_plt_entry;
|
|
|
|
unsigned int plt_entry_size; /* Size of each PLT entry. */
|
|
|
|
/* Offsets into plt_entry that are to be replaced with... */
|
|
unsigned int plt_got_offset; /* ... address of this symbol in .got. */
|
|
|
|
/* Length of the PC-relative instruction containing plt_got_offset.
|
|
This is used for x86-64 only. */
|
|
unsigned int plt_got_insn_size;
|
|
|
|
/* .eh_frame covering the non-lazy .plt section. */
|
|
const bfd_byte *eh_frame_plt;
|
|
unsigned int eh_frame_plt_size;
|
|
};
|
|
|
|
struct elf_x86_plt_layout
|
|
{
|
|
/* The first entry in a lazy procedure linkage table looks like this.
|
|
This is only used for i386 where absolute PLT0 and PIC PLT0 are
|
|
different. */
|
|
const bfd_byte *plt0_entry;
|
|
/* Entries in a procedure linkage table look like this. */
|
|
const bfd_byte *plt_entry;
|
|
unsigned int plt_entry_size; /* Size of each PLT entry. */
|
|
|
|
/* 1 has PLT0. */
|
|
unsigned int has_plt0;
|
|
|
|
/* Offsets into plt_entry that are to be replaced with... */
|
|
unsigned int plt_got_offset; /* ... address of this symbol in .got. */
|
|
|
|
/* Length of the PC-relative instruction containing plt_got_offset.
|
|
This is only used for x86-64. */
|
|
unsigned int plt_got_insn_size;
|
|
|
|
/* .eh_frame covering the .plt section. */
|
|
const bfd_byte *eh_frame_plt;
|
|
unsigned int eh_frame_plt_size;
|
|
};
|
|
|
|
/* Values in tls_type of x86 ELF linker hash entry. */
|
|
#define GOT_UNKNOWN 0
|
|
#define GOT_NORMAL 1
|
|
#define GOT_TLS_GD 2
|
|
#define GOT_TLS_IE 4
|
|
#define GOT_TLS_IE_POS 5
|
|
#define GOT_TLS_IE_NEG 6
|
|
#define GOT_TLS_IE_BOTH 7
|
|
#define GOT_TLS_GDESC 8
|
|
#define GOT_TLS_GD_BOTH_P(type) \
|
|
((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
|
|
#define GOT_TLS_GD_P(type) \
|
|
((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
|
|
#define GOT_TLS_GDESC_P(type) \
|
|
((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
|
|
#define GOT_TLS_GD_ANY_P(type) \
|
|
(GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
|
|
|
|
#define elf_x86_hash_entry(ent) \
|
|
((struct elf_x86_link_hash_entry *)(ent))
|
|
|
|
enum elf_x86_target_os
|
|
{
|
|
is_normal,
|
|
is_vxworks,
|
|
is_nacl
|
|
};
|
|
|
|
/* x86 ELF linker hash table. */
|
|
|
|
struct elf_x86_link_hash_table
|
|
{
|
|
struct elf_link_hash_table elf;
|
|
|
|
/* Short-cuts to get to dynamic linker sections. */
|
|
asection *interp;
|
|
asection *plt_eh_frame;
|
|
asection *plt_second;
|
|
asection *plt_second_eh_frame;
|
|
asection *plt_got;
|
|
asection *plt_got_eh_frame;
|
|
|
|
/* Parameters describing PLT generation, lazy or non-lazy. */
|
|
struct elf_x86_plt_layout plt;
|
|
|
|
/* Parameters describing lazy PLT generation. */
|
|
const struct elf_x86_lazy_plt_layout *lazy_plt;
|
|
|
|
/* Parameters describing non-lazy PLT generation. */
|
|
const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
|
|
|
|
union
|
|
{
|
|
bfd_signed_vma refcount;
|
|
bfd_vma offset;
|
|
} tls_ld_or_ldm_got;
|
|
|
|
/* The amount of space used by the jump slots in the GOT. */
|
|
bfd_vma sgotplt_jump_table_size;
|
|
|
|
/* Small local sym cache. */
|
|
struct sym_cache sym_cache;
|
|
|
|
/* _TLS_MODULE_BASE_ symbol. */
|
|
struct bfd_link_hash_entry *tls_module_base;
|
|
|
|
/* Used by local STT_GNU_IFUNC symbols. */
|
|
htab_t loc_hash_table;
|
|
void * loc_hash_memory;
|
|
|
|
/* The offset into sgot of the GOT entry used by the PLT entry
|
|
above. */
|
|
bfd_vma tlsdesc_got;
|
|
|
|
/* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
|
|
bfd_vma next_jump_slot_index;
|
|
/* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
|
|
bfd_vma next_irelative_index;
|
|
|
|
/* TRUE if there are dynamic relocs against IFUNC symbols that apply
|
|
to read-only sections. */
|
|
bfd_boolean readonly_dynrelocs_against_ifunc;
|
|
|
|
/* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
|
|
This is used for i386 only. */
|
|
asection *srelplt2;
|
|
|
|
/* The index of the next unused R_386_TLS_DESC slot in .rel.plt. This
|
|
is only used for i386. */
|
|
bfd_vma next_tls_desc_index;
|
|
|
|
/* The offset into splt of the PLT entry for the TLS descriptor
|
|
resolver. Special values are 0, if not necessary (or not found
|
|
to be necessary yet), and -1 if needed but not determined
|
|
yet. This is only used for x86-64. */
|
|
bfd_vma tlsdesc_plt;
|
|
|
|
/* Value used to fill the unused bytes of the first PLT entry. This
|
|
is only used for i386. */
|
|
bfd_byte plt0_pad_byte;
|
|
|
|
bfd_vma (*r_info) (bfd_vma, bfd_vma);
|
|
bfd_vma (*r_sym) (bfd_vma);
|
|
bfd_boolean (*is_reloc_section) (const char *);
|
|
enum elf_target_id target_id;
|
|
enum elf_x86_target_os target_os;
|
|
unsigned int sizeof_reloc;
|
|
unsigned int dt_reloc;
|
|
unsigned int dt_reloc_sz;
|
|
unsigned int dt_reloc_ent;
|
|
unsigned int got_entry_size;
|
|
unsigned int pointer_r_type;
|
|
int dynamic_interpreter_size;
|
|
const char *dynamic_interpreter;
|
|
const char *tls_get_addr;
|
|
};
|
|
|
|
/* Architecture-specific backend data for x86. */
|
|
|
|
struct elf_x86_backend_data
|
|
{
|
|
/* Target system. */
|
|
enum elf_x86_target_os target_os;
|
|
};
|
|
|
|
#define get_elf_x86_backend_data(abfd) \
|
|
((const struct elf_x86_backend_data *) \
|
|
get_elf_backend_data (abfd)->arch_data)
|
|
|
|
struct elf_x86_init_table
|
|
{
|
|
/* The lazy PLT layout. */
|
|
const struct elf_x86_lazy_plt_layout *lazy_plt;
|
|
|
|
/* The non-lazy PLT layout. */
|
|
const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
|
|
|
|
/* The lazy PLT layout for IBT. */
|
|
const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
|
|
|
|
/* The non-lazy PLT layout for IBT. */
|
|
const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
|
|
|
|
bfd_byte plt0_pad_byte;
|
|
|
|
bfd_vma (*r_info) (bfd_vma, bfd_vma);
|
|
bfd_vma (*r_sym) (bfd_vma);
|
|
};
|
|
|
|
struct elf_x86_obj_tdata
|
|
{
|
|
struct elf_obj_tdata root;
|
|
|
|
/* tls_type for each local got entry. */
|
|
char *local_got_tls_type;
|
|
|
|
/* GOTPLT entries for TLS descriptors. */
|
|
bfd_vma *local_tlsdesc_gotent;
|
|
};
|
|
|
|
enum elf_x86_plt_type
|
|
{
|
|
plt_non_lazy = 0,
|
|
plt_lazy = 1 << 0,
|
|
plt_pic = 1 << 1,
|
|
plt_second = 1 << 2,
|
|
plt_unknown = -1
|
|
};
|
|
|
|
struct elf_x86_plt
|
|
{
|
|
const char *name;
|
|
asection *sec;
|
|
bfd_byte *contents;
|
|
enum elf_x86_plt_type type;
|
|
unsigned int plt_got_offset;
|
|
unsigned int plt_entry_size;
|
|
unsigned int plt_got_insn_size; /* Only used for x86-64. */
|
|
long count;
|
|
};
|
|
|
|
#define elf_x86_tdata(abfd) \
|
|
((struct elf_x86_obj_tdata *) (abfd)->tdata.any)
|
|
|
|
#define elf_x86_local_got_tls_type(abfd) \
|
|
(elf_x86_tdata (abfd)->local_got_tls_type)
|
|
|
|
#define elf_x86_local_tlsdesc_gotent(abfd) \
|
|
(elf_x86_tdata (abfd)->local_tlsdesc_gotent)
|
|
|
|
#define elf_x86_compute_jump_table_size(htab) \
|
|
((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)
|
|
|
|
#define is_x86_elf(bfd, htab) \
|
|
(bfd_get_flavour (bfd) == bfd_target_elf_flavour \
|
|
&& elf_tdata (bfd) != NULL \
|
|
&& elf_object_id (bfd) == (htab)->target_id)
|
|
|
|
extern bfd_boolean _bfd_x86_elf_mkobject
|
|
(bfd *);
|
|
|
|
extern void _bfd_x86_elf_set_tls_module_base
|
|
(struct bfd_link_info *);
|
|
|
|
extern bfd_vma _bfd_x86_elf_dtpoff_base
|
|
(struct bfd_link_info *);
|
|
|
|
extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
|
|
(struct elf_link_hash_entry *, void *);
|
|
|
|
extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
|
|
(struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *,
|
|
bfd_boolean);
|
|
|
|
extern hashval_t _bfd_x86_elf_local_htab_hash
|
|
(const void *);
|
|
|
|
extern int _bfd_x86_elf_local_htab_eq
|
|
(const void *, const void *);
|
|
|
|
extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
|
|
(struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
|
|
|
|
extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
|
|
(bfd *);
|
|
|
|
extern int _bfd_x86_elf_compare_relocs
|
|
(const void *, const void *);
|
|
|
|
extern bfd_boolean _bfd_x86_elf_link_check_relocs
|
|
(bfd *, struct bfd_link_info *);
|
|
|
|
extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
|
|
(bfd *, struct bfd_link_info *);
|
|
|
|
extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections
|
|
(bfd *, struct bfd_link_info *);
|
|
|
|
extern bfd_boolean _bfd_x86_elf_always_size_sections
|
|
(bfd *, struct bfd_link_info *);
|
|
|
|
extern void _bfd_x86_elf_merge_symbol_attribute
|
|
(struct elf_link_hash_entry *, const Elf_Internal_Sym *,
|
|
bfd_boolean, bfd_boolean);
|
|
|
|
extern void _bfd_x86_elf_copy_indirect_symbol
|
|
(struct bfd_link_info *, struct elf_link_hash_entry *,
|
|
struct elf_link_hash_entry *);
|
|
|
|
extern bfd_boolean _bfd_x86_elf_fixup_symbol
|
|
(struct bfd_link_info *, struct elf_link_hash_entry *);
|
|
|
|
extern bfd_boolean _bfd_x86_elf_hash_symbol
|
|
(struct elf_link_hash_entry *);
|
|
|
|
extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
|
|
(struct bfd_link_info *, struct elf_link_hash_entry *);
|
|
|
|
extern void _bfd_x86_elf_hide_symbol
|
|
(struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
|
|
|
|
extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
|
|
(struct bfd_link_info *, struct elf_link_hash_entry *);
|
|
|
|
extern asection * _bfd_x86_elf_gc_mark_hook
|
|
(asection *, struct bfd_link_info *, Elf_Internal_Rela *,
|
|
struct elf_link_hash_entry *, Elf_Internal_Sym *);
|
|
|
|
extern long _bfd_x86_elf_get_synthetic_symtab
|
|
(bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **,
|
|
asymbol **);
|
|
|
|
extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
|
|
(bfd *, unsigned int, bfd_byte *, unsigned int);
|
|
|
|
extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
|
|
(struct bfd_link_info *, bfd *, elf_property *, elf_property *);
|
|
|
|
extern bfd * _bfd_x86_elf_link_setup_gnu_properties
|
|
(struct bfd_link_info *, struct elf_x86_init_table *);
|
|
|
|
#define bfd_elf64_mkobject \
|
|
_bfd_x86_elf_mkobject
|
|
#define bfd_elf32_mkobject \
|
|
_bfd_x86_elf_mkobject
|
|
#define bfd_elf64_bfd_link_hash_table_create \
|
|
_bfd_x86_elf_link_hash_table_create
|
|
#define bfd_elf32_bfd_link_hash_table_create \
|
|
_bfd_x86_elf_link_hash_table_create
|
|
#define bfd_elf64_bfd_link_check_relocs \
|
|
_bfd_x86_elf_link_check_relocs
|
|
#define bfd_elf32_bfd_link_check_relocs \
|
|
_bfd_x86_elf_link_check_relocs
|
|
|
|
#define elf_backend_size_dynamic_sections \
|
|
_bfd_x86_elf_size_dynamic_sections
|
|
#define elf_backend_always_size_sections \
|
|
_bfd_x86_elf_always_size_sections
|
|
#define elf_backend_merge_symbol_attribute \
|
|
_bfd_x86_elf_merge_symbol_attribute
|
|
#define elf_backend_copy_indirect_symbol \
|
|
_bfd_x86_elf_copy_indirect_symbol
|
|
#define elf_backend_fixup_symbol \
|
|
_bfd_x86_elf_fixup_symbol
|
|
#define elf_backend_hash_symbol \
|
|
_bfd_x86_elf_hash_symbol
|
|
#define elf_backend_adjust_dynamic_symbol \
|
|
_bfd_x86_elf_adjust_dynamic_symbol
|
|
#define elf_backend_gc_mark_hook \
|
|
_bfd_x86_elf_gc_mark_hook
|
|
#define elf_backend_omit_section_dynsym \
|
|
((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
|
|
#define elf_backend_parse_gnu_properties \
|
|
_bfd_x86_elf_parse_gnu_properties
|
|
#define elf_backend_merge_gnu_properties \
|
|
_bfd_x86_elf_merge_gnu_properties
|