1  /* x86-specific ELF linker support between ld and bfd.
       2     Copyright (C) 2019-2023 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  /* Used to pass x86-specific linker options from ld to bfd.  */
      32  struct elf_linker_x86_params
      33  {
      34    /* TRUE if IBT-enabled PLT entries should be generated.  */
      35    unsigned int ibtplt: 1;
      36  
      37    /* TRUE if GNU_PROPERTY_X86_FEATURE_1_IBT should be generated.  */
      38    unsigned int ibt: 1;
      39  
      40    /* TRUE if GNU_PROPERTY_X86_FEATURE_1_SHSTK should be generated.  */
      41    unsigned int shstk: 1;
      42  
      43    /* TRUE if GNU_PROPERTY_X86_FEATURE_1_LAM_U48 should be generated.  */
      44    unsigned int lam_u48: 1;
      45  
      46    /* TRUE if GNU_PROPERTY_X86_FEATURE_1_LAM_U57 should be generated.  */
      47    unsigned int lam_u57: 1;
      48  
      49    /* TRUE if we shouldn't check relocation overflow.  */
      50    unsigned int no_reloc_overflow_check: 1;
      51  
      52    /* TRUE if generate a 1-byte NOP as suffix for x86 call instruction.  */
      53    unsigned int call_nop_as_suffix : 1;
      54  
      55    /* TRUE if -static is passed at command-line before all input files.  */
      56    unsigned int static_before_all_inputs : 1;
      57  
      58    /* TRUE if --dynamic-linker is passed at command-line.  */
      59    unsigned int has_dynamic_linker : 1;
      60  
      61    /* Report relative relocations.  */
      62    unsigned int report_relative_reloc : 1;
      63  
      64    /* X86-64 ISA level needed.  */
      65    unsigned int isa_level;
      66  
      67    /* Report missing IBT and SHSTK properties.  */
      68    enum elf_x86_prop_report cet_report;
      69  
      70    /* Report missing LAM_U48 property.  */
      71    enum elf_x86_prop_report lam_u48_report;
      72  
      73    /* Report missing LAM_U57 property.  */
      74    enum elf_x86_prop_report lam_u57_report;
      75  
      76    /* The 1-byte NOP for x86 call instruction.  */
      77    char call_nop_byte;
      78  };
      79  
      80  extern void _bfd_elf_linker_x86_set_options
      81    (struct bfd_link_info *, struct elf_linker_x86_params *);