| 1 | # This shell script emits a C file. -*- C -*- |
| 2 | # Copyright 2007, 2008, 2009 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 | # |
| 26 | fragment <<EOF |
| 27 | |
| 28 | #include "ldctor.h" |
| 29 | |
| 30 | /* Flag for the emulation-specific "--no-relax" option. */ |
| 31 | static bfd_boolean disable_relaxation = FALSE; |
| 32 | |
| 33 | static void check_sections (bfd *, asection *, void *); |
| 34 | |
| 35 | |
| 36 | /* This function is run after all the input files have been opened. */ |
| 37 | |
| 38 | static void |
| 39 | cr16_elf_after_open (void) |
| 40 | { |
| 41 | /* Call the standard elf routine. */ |
| 42 | gld${EMULATION_NAME}_after_open (); |
| 43 | |
| 44 | if (command_line.embedded_relocs |
| 45 | && (! link_info.relocatable)) |
| 46 | { |
| 47 | bfd *abfd; |
| 48 | |
| 49 | /* In the embedded relocs mode we create a .emreloc section for each |
| 50 | input file with a nonzero .data section. The BFD backend will fill in |
| 51 | these sections with magic numbers which can be used to relocate the |
| 52 | data section at run time. */ |
| 53 | for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next) |
| 54 | { |
| 55 | asection *datasec; |
| 56 | |
| 57 | /* As first-order business, make sure that each input BFD is either |
| 58 | COFF or ELF. We need to call a special BFD backend function to |
| 59 | generate the embedded relocs, and we have such functions only for |
| 60 | COFF and ELF. */ |
| 61 | if (bfd_get_flavour (abfd) != bfd_target_coff_flavour |
| 62 | && bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
| 63 | einfo ("%F%B: all input objects must be COFF or ELF for --embedded-relocs\n"); |
| 64 | |
| 65 | datasec = bfd_get_section_by_name (abfd, ".data.rel"); |
| 66 | |
| 67 | /* Note that we assume that the reloc_count field has already |
| 68 | been set up. We could call bfd_get_reloc_upper_bound, but |
| 69 | that returns the size of a memory buffer rather than a reloc |
| 70 | count. We do not want to call bfd_canonicalize_reloc, |
| 71 | because although it would always work it would force us to |
| 72 | read in the relocs into BFD canonical form, which would waste |
| 73 | a significant amount of time and memory. */ |
| 74 | if (datasec != NULL && datasec->reloc_count > 0) |
| 75 | { |
| 76 | asection *relsec; |
| 77 | |
| 78 | relsec = bfd_make_section (abfd, ".emreloc"); |
| 79 | if (relsec == NULL |
| 80 | || ! bfd_set_section_flags (abfd, relsec, |
| 81 | (SEC_ALLOC |
| 82 | | SEC_LOAD |
| 83 | | SEC_HAS_CONTENTS |
| 84 | | SEC_IN_MEMORY)) |
| 85 | || ! bfd_set_section_alignment (abfd, relsec, 2) |
| 86 | || ! bfd_set_section_size (abfd, relsec, |
| 87 | datasec->reloc_count * 8)) |
| 88 | einfo ("%F%B: can not create .emreloc section: %E\n"); |
| 89 | } |
| 90 | |
| 91 | /* Double check that all other data sections are empty, as is |
| 92 | required for embedded PIC code. */ |
| 93 | bfd_map_over_sections (abfd, check_sections, datasec); |
| 94 | } |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | /* Check that of the data sections, only the .data section has |
| 99 | relocs. This is called via bfd_map_over_sections. */ |
| 100 | |
| 101 | static void |
| 102 | check_sections (bfd *abfd, asection *sec, void *datasec) |
| 103 | { |
| 104 | if ((strncmp (bfd_get_section_name (abfd, sec), ".data.rel", 9) == 0) |
| 105 | && sec != datasec |
| 106 | && sec->reloc_count == 0 ) |
| 107 | einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n", |
| 108 | abfd, bfd_get_section_name (abfd, sec)); |
| 109 | } |
| 110 | |
| 111 | static void |
| 112 | cr16elf_after_parse (void) |
| 113 | { |
| 114 | /* Always behave as if called with --sort-common command line |
| 115 | option. |
| 116 | This is to emulate the CRTools' method of keeping variables |
| 117 | of different alignment in separate sections. */ |
| 118 | config.sort_common = TRUE; |
| 119 | |
| 120 | /* Don't create a demand-paged executable, since this feature isn't |
| 121 | meaninful in CR16 embedded systems. Moreover, when magic_demand_paged |
| 122 | is true the link sometimes fails. */ |
| 123 | config.magic_demand_paged = FALSE; |
| 124 | |
| 125 | after_parse_default (); |
| 126 | } |
| 127 | |
| 128 | /* This is called after the sections have been attached to output |
| 129 | sections, but before any sizes or addresses have been set. */ |
| 130 | |
| 131 | static void |
| 132 | cr16elf_before_allocation (void) |
| 133 | { |
| 134 | /* Call the default first. */ |
| 135 | gld${EMULATION_NAME}_before_allocation (); |
| 136 | |
| 137 | if (command_line.embedded_relocs |
| 138 | && (! link_info.relocatable)) |
| 139 | { |
| 140 | |
| 141 | bfd *abfd; |
| 142 | |
| 143 | /* If we are generating embedded relocs, call a special BFD backend |
| 144 | routine to do the work. */ |
| 145 | for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next) |
| 146 | { |
| 147 | asection *datasec, *relsec; |
| 148 | char *errmsg; |
| 149 | |
| 150 | datasec = bfd_get_section_by_name (abfd, ".data.rel"); |
| 151 | |
| 152 | if (datasec == NULL || datasec->reloc_count == 0) |
| 153 | continue; |
| 154 | |
| 155 | relsec = bfd_get_section_by_name (abfd, ".emreloc"); |
| 156 | ASSERT (relsec != NULL); |
| 157 | |
| 158 | if (! bfd_cr16_elf32_create_embedded_relocs (abfd, &link_info, |
| 159 | datasec, relsec, |
| 160 | &errmsg)) |
| 161 | { |
| 162 | if (errmsg == NULL) |
| 163 | einfo ("%B%X: can not create runtime reloc information: %E\n", |
| 164 | abfd); |
| 165 | else |
| 166 | einfo ("%X%B: can not create runtime reloc information: %s\n", |
| 167 | abfd, errmsg); |
| 168 | } |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | /* Enable relaxation by default if the "--no-relax" option was not |
| 173 | specified. This is done here instead of in the before_parse hook |
| 174 | because there is a check in main() to prohibit use of --relax and |
| 175 | -r together. */ |
| 176 | |
| 177 | if (!disable_relaxation) |
| 178 | command_line.relax = TRUE; |
| 179 | } |
| 180 | |
| 181 | EOF |
| 182 | |
| 183 | # Define some shell vars to insert bits of code into the standard elf |
| 184 | # parse_args and list_options functions. |
| 185 | # |
| 186 | PARSE_AND_LIST_PROLOGUE=' |
| 187 | #define OPTION_NO_RELAX 301 |
| 188 | ' |
| 189 | |
| 190 | PARSE_AND_LIST_LONGOPTS=' |
| 191 | { "no-relax", no_argument, NULL, OPTION_NO_RELAX}, |
| 192 | ' |
| 193 | |
| 194 | PARSE_AND_LIST_OPTIONS=' |
| 195 | fprintf (file, _(" --no-relax Do not relax branches\n")); |
| 196 | ' |
| 197 | |
| 198 | PARSE_AND_LIST_ARGS_CASES=' |
| 199 | case OPTION_NO_RELAX: |
| 200 | disable_relaxation = TRUE; |
| 201 | break; |
| 202 | ' |
| 203 | |
| 204 | # Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation |
| 205 | # |
| 206 | LDEMUL_AFTER_OPEN=cr16_elf_after_open |
| 207 | LDEMUL_AFTER_PARSE=cr16elf_after_parse |
| 208 | LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation |