bfd/elf-linker-x86.h

   1 /* x86-specific ELF linker support between ld and bfd.
   2    Copyright (C) 2019-2024 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, SHSTK and LAM property report control.  */
  22 enum elf_x86_prop_report
  23 {
  24   prop_report_none      = 0,        /* Do nothing.  */
  25   prop_report_warning   = 1 << 0,   /* Issue a warning.  */
  26   prop_report_error     = 1 << 1,   /* Issue an error.  */
  27   prop_report_ibt       = 1 << 2,   /* Report missing IBT property.  */
  28   prop_report_shstk     = 1 << 3    /* Report missing SHSTK property.  */
  29 };
  30
  31 /* ISA level report control.  */
  32 enum elf_x86_isa_level_report
  33 {
  34   isa_level_report_none   = 0,          /* Do nothing.  */
  35   isa_level_report_needed = 1 << 0,     /* Needed x86-64 ISA level.  */
  36   isa_level_report_used   = 1 << 1      /* Used x86-64 ISA level.  */
  37 };
  38
  39 /* Used to pass x86-specific linker options from ld to bfd.  */
  40 struct elf_linker_x86_params
  41 {
  42   /* TRUE if IBT-enabled PLT entries should be generated.  */
  43   unsigned int ibtplt: 1;
  44
  45   /* TRUE if GNU_PROPERTY_X86_FEATURE_1_IBT should be generated.  */
  46   unsigned int ibt: 1;
  47
  48   /* TRUE if GNU_PROPERTY_X86_FEATURE_1_SHSTK should be generated.  */
  49   unsigned int shstk: 1;
  50
  51   /* TRUE if GNU_PROPERTY_X86_FEATURE_1_LAM_U48 should be generated.  */
  52   unsigned int lam_u48: 1;
  53
  54   /* TRUE if GNU_PROPERTY_X86_FEATURE_1_LAM_U57 should be generated.  */
  55   unsigned int lam_u57: 1;
  56
  57   /* TRUE if we shouldn't check relocation overflow.  */
  58   unsigned int no_reloc_overflow_check: 1;
  59
  60   /* TRUE if generate a 1-byte NOP as suffix for x86 call instruction.  */
  61   unsigned int call_nop_as_suffix : 1;
  62
  63   /* TRUE if -static is passed at command-line before all input files.  */
  64   unsigned int static_before_all_inputs : 1;
  65
  66   /* TRUE if --dynamic-linker is passed at command-line.  */
  67   unsigned int has_dynamic_linker : 1;
  68
  69   /* Report relative relocations.  */
  70   unsigned int report_relative_reloc : 1;
  71
  72   /* Mark PLT with dynamic tags.  */
  73   unsigned int mark_plt : 1;
  74
  75   /* X86-64 ISA level needed.  */
  76   unsigned int isa_level;
  77
  78   /* Report needed and used x86-64 ISA levels.  */
  79   enum elf_x86_isa_level_report isa_level_report;
  80
  81   /* Report missing IBT and SHSTK properties.  */
  82   enum elf_x86_prop_report cet_report;
  83
  84   /* Report missing LAM_U48 property.  */
  85   enum elf_x86_prop_report lam_u48_report;
  86
  87   /* Report missing LAM_U57 property.  */
  88   enum elf_x86_prop_report lam_u57_report;
  89
  90   /* The 1-byte NOP for x86 call instruction.  */
  91   char call_nop_byte;
  92 };
  93
  94 extern void _bfd_elf_linker_x86_set_options
  95   (struct bfd_link_info *, struct elf_linker_x86_params *);