1# This shell script emits a C file. -*- C -*- 2# Copyright (C) 2007-2022 Free Software Foundation, Inc. 3# Contributed by M R Swami Reddy <MR.Swami.Reddy@nsc.com> 4# 5# This file is part of the GNU Binutils. 6# 7# This program is free software; you can redistribute it and/or modify 8# it under the terms of the GNU General Public License as published by 9# the Free Software Foundation; either version 3 of the License, or 10# (at your option) any later version. 11# 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with this program; if not, write to the Free Software 19# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20# MA 02110-1301, USA. 21# 22 23# This file is sourced from elf.em, and defines extra cr16-elf 24# specific routines. 25# 26fragment <<EOF 27 28#include "ldctor.h" 29#include "elf32-cr16.h" 30 31static void check_sections (bfd *, asection *, void *); 32 33 34/* This function is run after all the input files have been opened. */ 35 36static void 37cr16_elf_after_open (void) 38{ 39 /* Call the standard elf routine. */ 40 gld${EMULATION_NAME}_after_open (); 41 42 if (command_line.embedded_relocs 43 && !bfd_link_relocatable (&link_info)) 44 { 45 bfd *abfd; 46 47 /* In the embedded relocs mode we create a .emreloc section for each 48 input file with a nonzero .data section. The BFD backend will fill in 49 these sections with magic numbers which can be used to relocate the 50 data section at run time. */ 51 for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next) 52 { 53 asection *datasec; 54 55 /* As first-order business, make sure that each input BFD is either 56 COFF or ELF. We need to call a special BFD backend function to 57 generate the embedded relocs, and we have such functions only for 58 COFF and ELF. */ 59 if (bfd_get_flavour (abfd) != bfd_target_coff_flavour 60 && bfd_get_flavour (abfd) != bfd_target_elf_flavour) 61 einfo (_("%F%P: %pB: all input objects must be COFF or ELF " 62 "for --embedded-relocs\n")); 63 64 datasec = bfd_get_section_by_name (abfd, ".data.rel"); 65 66 /* Note that we assume that the reloc_count field has already 67 been set up. We could call bfd_get_reloc_upper_bound, but 68 that returns the size of a memory buffer rather than a reloc 69 count. We do not want to call bfd_canonicalize_reloc, 70 because although it would always work it would force us to 71 read in the relocs into BFD canonical form, which would waste 72 a significant amount of time and memory. */ 73 if (datasec != NULL && datasec->reloc_count > 0) 74 { 75 asection *relsec; 76 77 relsec = bfd_make_section (abfd, ".emreloc"); 78 if (relsec == NULL 79 || !bfd_set_section_flags (relsec, (SEC_ALLOC 80 | SEC_LOAD 81 | SEC_HAS_CONTENTS 82 | SEC_IN_MEMORY)) 83 || !bfd_set_section_alignment (relsec, 2) 84 || !bfd_set_section_size (relsec, datasec->reloc_count * 8)) 85 einfo (_("%F%P: %pB: can not create .emreloc section: %E\n")); 86 } 87 88 /* Double check that all other data sections are empty, as is 89 required for embedded PIC code. */ 90 bfd_map_over_sections (abfd, check_sections, datasec); 91 } 92 } 93} 94 95/* Check that of the data sections, only the .data section has 96 relocs. This is called via bfd_map_over_sections. */ 97 98static void 99check_sections (bfd *abfd, asection *sec, void *datasec) 100{ 101 if ((strncmp (bfd_section_name (sec), ".data.rel", 9) == 0) 102 && sec != datasec 103 && sec->reloc_count == 0 ) 104 einfo (_("%X%P: %pB: section %s has relocs; can not use --embedded-relocs\n"), 105 abfd, bfd_section_name (sec)); 106} 107 108static void 109cr16elf_after_parse (void) 110{ 111 /* Always behave as if called with --sort-common command line 112 option. 113 This is to emulate the CRTools' method of keeping variables 114 of different alignment in separate sections. */ 115 config.sort_common = true; 116 117 /* Don't create a demand-paged executable, since this feature isn't 118 meaninful in CR16 embedded systems. Moreover, when magic_demand_paged 119 is true the link sometimes fails. */ 120 config.magic_demand_paged = false; 121 122 ldelf_after_parse (); 123} 124 125/* This is called after the sections have been attached to output 126 sections, but before any sizes or addresses have been set. */ 127 128static void 129cr16elf_before_allocation (void) 130{ 131 /* Call the default first. */ 132 gld${EMULATION_NAME}_before_allocation (); 133 134 if (command_line.embedded_relocs 135 && (!bfd_link_relocatable (&link_info))) 136 { 137 138 bfd *abfd; 139 140 /* If we are generating embedded relocs, call a special BFD backend 141 routine to do the work. */ 142 for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next) 143 { 144 asection *datasec, *relsec; 145 char *errmsg; 146 147 datasec = bfd_get_section_by_name (abfd, ".data.rel"); 148 149 if (datasec == NULL || datasec->reloc_count == 0) 150 continue; 151 152 relsec = bfd_get_section_by_name (abfd, ".emreloc"); 153 ASSERT (relsec != NULL); 154 155 if (! bfd_cr16_elf32_create_embedded_relocs (abfd, &link_info, 156 datasec, relsec, 157 &errmsg)) 158 { 159 if (errmsg == NULL) 160 einfo (_("%X%P: %pB: can not create runtime reloc information: %E\n"), 161 abfd); 162 else 163 einfo (_("%X%P: %pB: can not create runtime reloc information: %s\n"), 164 abfd, errmsg); 165 } 166 } 167 } 168 169 /* Enable relaxation by default if the "--no-relax" option was not 170 specified. This is done here instead of in the before_parse hook 171 because there is a check in main() to prohibit use of --relax and 172 -r together. */ 173 if (RELAXATION_DISABLED_BY_DEFAULT) 174 ENABLE_RELAXATION; 175} 176 177EOF 178 179# Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation 180# 181LDEMUL_AFTER_OPEN=cr16_elf_after_open 182LDEMUL_AFTER_PARSE=cr16elf_after_parse 183LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation 184