1 # This shell script emits a C file. -*- C -*- 2 # Copyright (C) 2007-2014 Free Software Foundation, Inc. 3 # Contributed by M R Swami Reddy <MR.Swami.Reddy (a] 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 # 26 fragment <<EOF 27 28 #include "ldctor.h" 29 30 static void check_sections (bfd *, asection *, void *); 31 32 33 /* This function is run after all the input files have been opened. */ 34 35 static void 36 cr16_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 && (! link_info.relocatable)) 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%B: all input objects must be COFF or ELF for --embedded-relocs\n"); 61 62 datasec = bfd_get_section_by_name (abfd, ".data.rel"); 63 64 /* Note that we assume that the reloc_count field has already 65 been set up. We could call bfd_get_reloc_upper_bound, but 66 that returns the size of a memory buffer rather than a reloc 67 count. We do not want to call bfd_canonicalize_reloc, 68 because although it would always work it would force us to 69 read in the relocs into BFD canonical form, which would waste 70 a significant amount of time and memory. */ 71 if (datasec != NULL && datasec->reloc_count > 0) 72 { 73 asection *relsec; 74 75 relsec = bfd_make_section (abfd, ".emreloc"); 76 if (relsec == NULL 77 || ! bfd_set_section_flags (abfd, relsec, 78 (SEC_ALLOC 79 | SEC_LOAD 80 | SEC_HAS_CONTENTS 81 | SEC_IN_MEMORY)) 82 || ! bfd_set_section_alignment (abfd, relsec, 2) 83 || ! bfd_set_section_size (abfd, relsec, 84 datasec->reloc_count * 8)) 85 einfo ("%F%B: 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 98 static void 99 check_sections (bfd *abfd, asection *sec, void *datasec) 100 { 101 if ((strncmp (bfd_get_section_name (abfd, sec), ".data.rel", 9) == 0) 102 && sec != datasec 103 && sec->reloc_count == 0 ) 104 einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n", 105 abfd, bfd_get_section_name (abfd, sec)); 106 } 107 108 static void 109 cr16elf_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 after_parse_default (); 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. */ 127 128 static void 129 cr16elf_before_allocation (void) 130 { 131 /* Call the default first. */ 132 gld${EMULATION_NAME}_before_allocation (); 133 134 if (command_line.embedded_relocs 135 && (! link_info.relocatable)) 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 ("%B%X: can not create runtime reloc information: %E\n", 161 abfd); 162 else 163 einfo ("%X%B: 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 } 176 177 EOF 178 179 # Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation 180 # 181 LDEMUL_AFTER_OPEN=cr16_elf_after_open 182 LDEMUL_AFTER_PARSE=cr16elf_after_parse 183 LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation 184
