binutils-gdb/bfd/elf-linker-x86.h

/* x86-specific ELF linker support between ld and bfd.
   Copyright (C) 2019-2020 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.  */

/* Missing IBT, SHSTK and LAM property report control.  */
enum elf_x86_prop_report
{
  prop_report_none	= 0,	    /* Do nothing.  */
  prop_report_warning	= 1 << 0,   /* Issue a warning.  */
  prop_report_error	= 1 << 1,   /* Issue an error.  */
  prop_report_ibt	= 1 << 2,   /* Report missing IBT property.  */
  prop_report_shstk	= 1 << 3    /* Report missing SHSTK property.  */
};

/* Used to pass x86-specific linker options from ld to bfd.  */
struct elf_linker_x86_params
{
  /* TRUE if BND prefix in PLT entries is always generated.  */
  unsigned int bndplt: 1;

  /* TRUE if IBT-enabled PLT entries should be generated.  */
  unsigned int ibtplt: 1;

  /* TRUE if GNU_PROPERTY_X86_FEATURE_1_IBT should be generated.  */
  unsigned int ibt: 1;

  /* TRUE if GNU_PROPERTY_X86_FEATURE_1_SHSTK should be generated.  */
  unsigned int shstk: 1;

  /* TRUE if GNU_PROPERTY_X86_FEATURE_1_LAM_U48 should be generated.  */
  unsigned int lam_u48: 1;

  /* TRUE if GNU_PROPERTY_X86_FEATURE_1_LAM_U57 should be generated.  */
  unsigned int lam_u57: 1;

  /* TRUE if we shouldn't check relocation overflow.  */
  unsigned int no_reloc_overflow_check: 1;

  /* TRUE if generate a 1-byte NOP as suffix for x86 call instruction.  */
  unsigned int call_nop_as_suffix : 1;

  /* TRUE if -static is passed at command-line before all input files.  */
  unsigned int static_before_all_inputs : 1;

  /* TRUE if --dynamic-linker is passed at command-line.  */
  unsigned int has_dynamic_linker : 1;

  /* X86-64 ISA level needed.  */
  unsigned int isa_level;

  /* Report missing IBT and SHSTK properties.  */
  enum elf_x86_prop_report cet_report;

  /* Report missing LAM_U48 property.  */
  enum elf_x86_prop_report lam_u48_report;

  /* Report missing LAM_U57 property.  */
  enum elf_x86_prop_report lam_u57_report;

  /* The 1-byte NOP for x86 call instruction.  */
  char call_nop_byte;
};

extern void _bfd_elf_linker_x86_set_options
  (struct bfd_link_info *, struct elf_linker_x86_params *);