1# This shell script emits a C file. -*- C -*- 2# Copyright (C) 2007-2018 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 elf32.em, and defines extra cr16-elf 24# specific routines. 25# 26fragment <<EOF 27 28#include "ldctor.h" 29 30static void check_sections (bfd *, asection *, void *); 31 32 33/* This function is run after all the input files have been opened. */ 34 35static void 36cr16_elf_after_open (void) 37{ 38 /* Call the standard elf routine. */ 39 gld${EMULATION_NAME}_after_open (); 40 41 if (command_line.embedded_relocs 42 && !bfd_link_relocatable (&link_info)) 43 { 44 bfd *abfd; 45 46 /* In the embedded relocs mode we create a .emreloc section for each 47 input file with a nonzero .data section. The BFD backend will fill in 48 these sections with magic numbers which can be used to relocate the 49 data section at run time. */ 50 for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next) 51 { 52 asection *datasec; 53 54 /* As first-order business, make sure that each input BFD is either 55 COFF or ELF. We need to call a special BFD backend function to 56 generate the embedded relocs, and we have such functions only for 57 COFF and ELF. */ 58 if (bfd_get_flavour (abfd) != bfd_target_coff_flavour 59 && bfd_get_flavour (abfd) != bfd_target_elf_flavour) 60 einfo (_("%F%P: %pB: all input objects must be COFF or ELF " 61 "for --embedded-relocs\n")); 62 63 datasec = bfd_get_section_by_name (abfd, ".data.rel"); 64 65 /* Note that we assume that the reloc_count field has already 66 been set up. We could call bfd_get_reloc_upper_bound, but 67 that returns the size of a memory buffer rather than a reloc 68 count. We do not want to call bfd_canonicalize_reloc, 69 because although it would always work it would force us to 70 read in the relocs into BFD canonical form, which would waste 71 a significant amount of time and memory. */ 72 if (datasec != NULL && datasec->reloc_count > 0) 73 { 74 asection *relsec; 75 76 relsec = bfd_make_section (abfd, ".emreloc"); 77 if (relsec == NULL 78 || ! bfd_set_section_flags (abfd, relsec, 79 (SEC_ALLOC 80 | SEC_LOAD 81 | SEC_HAS_CONTENTS 82 | SEC_IN_MEMORY)) 83 || ! bfd_set_section_alignment (abfd, relsec, 2) 84 || ! bfd_set_section_size (abfd, relsec, 85 datasec->reloc_count * 8)) 86 einfo (_("%F%P: %pB: can not create .emreloc section: %E\n")); 87 } 88 89 /* Double check that all other data sections are empty, as is 90 required for embedded PIC code. */ 91 bfd_map_over_sections (abfd, check_sections, datasec); 92 } 93 } 94} 95 96/* Check that of the data sections, only the .data section has 97 relocs. This is called via bfd_map_over_sections. */ 98 99static void 100check_sections (bfd *abfd, asection *sec, void *datasec) 101{ 102 if ((strncmp (bfd_get_section_name (abfd, sec), ".data.rel", 9) == 0) 103 && sec != datasec 104 && sec->reloc_count == 0 ) 105 einfo (_("%X%P: %pB: section %s has relocs; can not use --embedded-relocs\n"), 106 abfd, bfd_get_section_name (abfd, sec)); 107} 108 109static void 110cr16elf_after_parse (void) 111{ 112 /* Always behave as if called with --sort-common command line 113 option. 114 This is to emulate the CRTools' method of keeping variables 115 of different alignment in separate sections. */ 116 config.sort_common = TRUE; 117 118 /* Don't create a demand-paged executable, since this feature isn't 119 meaninful in CR16 embedded systems. Moreover, when magic_demand_paged 120 is true the link sometimes fails. */ 121 config.magic_demand_paged = FALSE; 122 123 gld${EMULATION_NAME}_after_parse (); 124} 125 126/* This is called after the sections have been attached to output 127 sections, but before any sizes or addresses have been set. */ 128 129static void 130cr16elf_before_allocation (void) 131{ 132 /* Call the default first. */ 133 gld${EMULATION_NAME}_before_allocation (); 134 135 if (command_line.embedded_relocs 136 && (!bfd_link_relocatable (&link_info))) 137 { 138 139 bfd *abfd; 140 141 /* If we are generating embedded relocs, call a special BFD backend 142 routine to do the work. */ 143 for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next) 144 { 145 asection *datasec, *relsec; 146 char *errmsg; 147 148 datasec = bfd_get_section_by_name (abfd, ".data.rel"); 149 150 if (datasec == NULL || datasec->reloc_count == 0) 151 continue; 152 153 relsec = bfd_get_section_by_name (abfd, ".emreloc"); 154 ASSERT (relsec != NULL); 155 156 if (! bfd_cr16_elf32_create_embedded_relocs (abfd, &link_info, 157 datasec, relsec, 158 &errmsg)) 159 { 160 if (errmsg == NULL) 161 einfo (_("%X%P: %pB: can not create runtime reloc information: %E\n"), 162 abfd); 163 else 164 einfo (_("%X%P: %pB: can not create runtime reloc information: %s\n"), 165 abfd, errmsg); 166 } 167 } 168 } 169 170 /* Enable relaxation by default if the "--no-relax" option was not 171 specified. This is done here instead of in the before_parse hook 172 because there is a check in main() to prohibit use of --relax and 173 -r together. */ 174 if (RELAXATION_DISABLED_BY_DEFAULT) 175 ENABLE_RELAXATION; 176} 177 178EOF 179 180# Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation 181# 182LDEMUL_AFTER_OPEN=cr16_elf_after_open 183LDEMUL_AFTER_PARSE=cr16elf_after_parse 184LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation 185