ld/emultempl/riscvelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright (C) 2004-2022 Free Software Foundation, Inc.
   3 #
   4 # This file is part of the GNU Binutils.
   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 fragment <<EOF
  22
  23 #include "ldmain.h"
  24 #include "ldctor.h"
  25 #include "elf/riscv.h"
  26 #include "elfxx-riscv.h"
  27
  28 static void
  29 riscv_elf_before_allocation (void)
  30 {
  31   gld${EMULATION_NAME}_before_allocation ();
  32
  33   if (link_info.discard == discard_sec_merge)
  34     link_info.discard = discard_l;
  35
  36   if (!bfd_link_relocatable (&link_info))
  37     {
  38       /* We always need at least some relaxation to handle code alignment.  */
  39       if (RELAXATION_DISABLED_BY_USER)
  40         TARGET_ENABLE_RELAXATION;
  41       else
  42         ENABLE_RELAXATION;
  43     }
  44
  45   link_info.relax_pass = 3;
  46 }
  47
  48 static void
  49 gld${EMULATION_NAME}_after_allocation (void)
  50 {
  51   int need_layout = 0;
  52
  53   /* Don't attempt to discard unused .eh_frame sections until the final link,
  54      as we can't reliably tell if they're used until after relaxation.  */
  55   if (!bfd_link_relocatable (&link_info))
  56     {
  57       need_layout = bfd_elf_discard_info (link_info.output_bfd, &link_info);
  58       if (need_layout < 0)
  59         {
  60           einfo (_("%X%P: .eh_frame/.stab edit: %E\n"));
  61           return;
  62         }
  63     }
  64
  65   /* PR 27566, if the phase of data segment is exp_seg_relro_adjust,
  66      that means we are still adjusting the relro, and shouldn't do the
  67      relaxations at this stage.  Otherwise, we will get the symbol
  68      values beofore handling the relro, and may cause truncated fails
  69      when the relax range crossing the data segment.  One of the solution
  70      is to monitor the data segment phase while relaxing, to know whether
  71      the relro has been handled or not.
  72
  73      I think we probably need to record more information about data
  74      segment or alignments in the future, to make sure it is safe
  75      to doing relaxations.  */
  76   enum phase_enum *phase = &(expld.dataseg.phase);
  77   bfd_elf${ELFSIZE}_riscv_set_data_segment_info (&link_info, (int *) phase);
  78
  79   ldelf_map_segments (need_layout);
  80 }
  81
  82 /* This is a convenient point to tell BFD about target specific flags.
  83    After the output has been created, but before inputs are read.  */
  84
  85 static void
  86 riscv_create_output_section_statements (void)
  87 {
  88   /* See PR 22920 for an example of why this is necessary.  */
  89   if (strstr (bfd_get_target (link_info.output_bfd), "riscv") == NULL)
  90     {
  91       /* The RISC-V backend needs special fields in the output hash structure.
  92          These will only be created if the output format is a RISC-V format,
  93          hence we do not support linking and changing output formats at the
  94          same time.  Use a link followed by objcopy to change output formats.  */
  95       einfo (_("%F%P: error: cannot change output format"
  96                " whilst linking %s binaries\n"), "RISC-V");
  97       return;
  98     }
  99 }
 100
 101 EOF
 102
 103 LDEMUL_BEFORE_ALLOCATION=riscv_elf_before_allocation
 104 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
 105 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=riscv_create_output_section_statements