bfd/elf-linker-x86.h

   1 /* x86-specific ELF linker support between ld and bfd.
   2    Copyright (C) 2019-2020 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 /* Missing IBT and SHSTK property report control.  */
  22 enum elf_x86_cet_report
  23 {
  24   cet_report_none       = 0,        /* Do nothing.  */
  25   cet_report_warning    = 1 << 0,   /* Issue a warning.  */
  26   cet_report_error      = 1 << 1,   /* Issue an error.  */
  27   cet_report_ibt        = 1 << 2,   /* Report missing IBT property.  */
  28   cet_report_shstk      = 1 << 3    /* Report missing SHSTK property.  */
  29 };
  30
  31 /* Used to pass x86-specific linker options from ld to bfd.  */
  32 struct elf_linker_x86_params
  33 {
  34   /* TRUE if BND prefix in PLT entries is always generated.  */
  35   unsigned int bndplt: 1;
  36
  37   /* TRUE if IBT-enabled PLT entries should be generated.  */
  38   unsigned int ibtplt: 1;
  39
  40   /* TRUE if GNU_PROPERTY_X86_FEATURE_1_IBT should be generated.  */
  41   unsigned int ibt: 1;
  42
  43   /* TRUE if GNU_PROPERTY_X86_FEATURE_1_SHSTK should be generated.  */
  44   unsigned int shstk: 1;
  45
  46   /* TRUE if we shouldn't check relocation overflow.  */
  47   unsigned int no_reloc_overflow_check: 1;
  48
  49   /* TRUE if generate a 1-byte NOP as suffix for x86 call instruction.  */
  50   unsigned int call_nop_as_suffix : 1;
  51
  52   /* TRUE if -static is passed at command-line before all input files.  */
  53   unsigned int static_before_all_inputs : 1;
  54
  55   /* TRUE if --dynamic-linker is passed at command-line.  */
  56   unsigned int has_dynamic_linker : 1;
  57
  58   /* X86-64 ISA level needed.  */
  59   unsigned int isa_level;
  60
  61   /* Report missing IBT and SHSTK properties.  */
  62   enum elf_x86_cet_report cet_report;
  63
  64   /* The 1-byte NOP for x86 call instruction.  */
  65   char call_nop_byte;
  66 };
  67
  68 extern void _bfd_elf_linker_x86_set_options
  69   (struct bfd_link_info *, struct elf_linker_x86_params *);