| 1 | # This shell script emits a C file. -*- C -*- |
| 2 | # Copyright (C) 2000-2020 Free Software Foundation, Inc. |
| 3 | # Written by Michael Sokolov <msokolov@ivan.Harhan.ORG>, based on armelf.em |
| 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 some extra routines for m68k |
| 24 | # embedded systems using ELF and for some other systems using m68k ELF. While |
| 25 | # it is sourced from elf.em for all m68k ELF configurations, here we include |
| 26 | # only the features we want depending on the configuration. |
| 27 | |
| 28 | case ${target} in |
| 29 | m68*-*-elf) |
| 30 | echo "#define SUPPORT_EMBEDDED_RELOCS" >>e${EMULATION_NAME}.c |
| 31 | ;; |
| 32 | esac |
| 33 | |
| 34 | case ${target} in |
| 35 | *-linux*) |
| 36 | # Don't use multi-GOT by default due to glibc linker's assumption |
| 37 | # that GOT pointer points to GOT[0]. |
| 38 | # got_handling_target_default=GOT_HANDLING_MULTIGOT |
| 39 | got_handling_target_default=GOT_HANDLING_SINGLE |
| 40 | ;; |
| 41 | *) |
| 42 | got_handling_target_default=GOT_HANDLING_SINGLE |
| 43 | ;; |
| 44 | esac |
| 45 | |
| 46 | fragment <<EOF |
| 47 | |
| 48 | #include "elf32-m68k.h" |
| 49 | |
| 50 | #define GOT_HANDLING_SINGLE (0) |
| 51 | #define GOT_HANDLING_NEGATIVE (1) |
| 52 | #define GOT_HANDLING_MULTIGOT (2) |
| 53 | #define GOT_HANDLING_TARGET_DEFAULT ${got_handling_target_default} |
| 54 | |
| 55 | /* How to generate GOT. */ |
| 56 | static int got_handling = GOT_HANDLING_DEFAULT; |
| 57 | |
| 58 | #ifdef SUPPORT_EMBEDDED_RELOCS |
| 59 | static void check_sections (bfd *, asection *, void *); |
| 60 | #endif |
| 61 | |
| 62 | /* This function is run after all the input files have been opened. */ |
| 63 | |
| 64 | static void |
| 65 | m68k_elf_after_open (void) |
| 66 | { |
| 67 | /* Call the standard elf routine. */ |
| 68 | gld${EMULATION_NAME}_after_open (); |
| 69 | |
| 70 | #ifdef SUPPORT_EMBEDDED_RELOCS |
| 71 | if (command_line.embedded_relocs |
| 72 | && (!bfd_link_relocatable (&link_info))) |
| 73 | { |
| 74 | bfd *abfd; |
| 75 | |
| 76 | /* In the embedded relocs mode we create a .emreloc section for each |
| 77 | input file with a nonzero .data section. The BFD backend will fill in |
| 78 | these sections with magic numbers which can be used to relocate the |
| 79 | data section at run time. */ |
| 80 | for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next) |
| 81 | { |
| 82 | asection *datasec; |
| 83 | |
| 84 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
| 85 | einfo (_("%F%P: %pB: all input objects must be ELF " |
| 86 | "for --embedded-relocs\n")); |
| 87 | |
| 88 | datasec = bfd_get_section_by_name (abfd, ".data"); |
| 89 | |
| 90 | /* Note that we assume that the reloc_count field has already |
| 91 | been set up. We could call bfd_get_reloc_upper_bound, but |
| 92 | that returns the size of a memory buffer rather than a reloc |
| 93 | count. We do not want to call bfd_canonicalize_reloc, |
| 94 | because although it would always work it would force us to |
| 95 | read in the relocs into BFD canonical form, which would waste |
| 96 | a significant amount of time and memory. */ |
| 97 | if (datasec != NULL && datasec->reloc_count > 0) |
| 98 | { |
| 99 | asection *relsec; |
| 100 | |
| 101 | relsec = bfd_make_section_with_flags (abfd, ".emreloc", |
| 102 | (SEC_ALLOC |
| 103 | | SEC_LOAD |
| 104 | | SEC_HAS_CONTENTS |
| 105 | | SEC_IN_MEMORY)); |
| 106 | if (relsec == NULL |
| 107 | || !bfd_set_section_alignment (relsec, 2) |
| 108 | || !bfd_set_section_size (relsec, datasec->reloc_count * 12)) |
| 109 | einfo (_("%F%P: %pB: can not create .emreloc section: %E\n")); |
| 110 | } |
| 111 | |
| 112 | /* Double check that all other data sections are empty, as is |
| 113 | required for embedded PIC code. */ |
| 114 | bfd_map_over_sections (abfd, check_sections, datasec); |
| 115 | } |
| 116 | } |
| 117 | #endif /* SUPPORT_EMBEDDED_RELOCS */ |
| 118 | } |
| 119 | |
| 120 | #ifdef SUPPORT_EMBEDDED_RELOCS |
| 121 | /* Check that of the data sections, only the .data section has |
| 122 | relocs. This is called via bfd_map_over_sections. */ |
| 123 | |
| 124 | static void |
| 125 | check_sections (bfd *abfd, asection *sec, void *datasec) |
| 126 | { |
| 127 | if ((bfd_section_flags (sec) & SEC_DATA) |
| 128 | && sec != datasec |
| 129 | && sec->reloc_count != 0) |
| 130 | einfo (_("%X%P: %pB: section %s has relocs; can not use --embedded-relocs\n"), |
| 131 | abfd, bfd_section_name (sec)); |
| 132 | } |
| 133 | |
| 134 | #endif /* SUPPORT_EMBEDDED_RELOCS */ |
| 135 | |
| 136 | /* This function is called after the section sizes and offsets have |
| 137 | been set. */ |
| 138 | |
| 139 | static void |
| 140 | m68k_elf_after_allocation (void) |
| 141 | { |
| 142 | /* Call the standard elf routine. */ |
| 143 | gld${EMULATION_NAME}_after_allocation (); |
| 144 | |
| 145 | #ifdef SUPPORT_EMBEDDED_RELOCS |
| 146 | if (command_line.embedded_relocs |
| 147 | && (!bfd_link_relocatable (&link_info))) |
| 148 | { |
| 149 | bfd *abfd; |
| 150 | |
| 151 | /* If we are generating embedded relocs, call a special BFD backend |
| 152 | routine to do the work. */ |
| 153 | for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next) |
| 154 | { |
| 155 | asection *datasec, *relsec; |
| 156 | char *errmsg; |
| 157 | |
| 158 | datasec = bfd_get_section_by_name (abfd, ".data"); |
| 159 | |
| 160 | if (datasec == NULL || datasec->reloc_count == 0) |
| 161 | continue; |
| 162 | |
| 163 | relsec = bfd_get_section_by_name (abfd, ".emreloc"); |
| 164 | ASSERT (relsec != NULL); |
| 165 | |
| 166 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
| 167 | { |
| 168 | if (! bfd_m68k_elf32_create_embedded_relocs (abfd, &link_info, |
| 169 | datasec, relsec, |
| 170 | &errmsg)) |
| 171 | { |
| 172 | if (errmsg == NULL) |
| 173 | einfo (_("%X%P: %pB: can not create " |
| 174 | "runtime reloc information: %E\n"), |
| 175 | abfd); |
| 176 | else |
| 177 | einfo (_("%X%P: %pB: can not create " |
| 178 | "runtime reloc information: %s\n"), |
| 179 | abfd, errmsg); |
| 180 | } |
| 181 | } |
| 182 | else |
| 183 | abort (); |
| 184 | } |
| 185 | } |
| 186 | #endif /* SUPPORT_EMBEDDED_RELOCS */ |
| 187 | } |
| 188 | |
| 189 | /* This is a convenient point to tell BFD about target specific flags. |
| 190 | After the output has been created, but before inputs are read. */ |
| 191 | |
| 192 | static void |
| 193 | elf_m68k_create_output_section_statements (void) |
| 194 | { |
| 195 | bfd_elf_m68k_set_target_options (&link_info, got_handling); |
| 196 | } |
| 197 | |
| 198 | EOF |
| 199 | |
| 200 | # Define some shell vars to insert bits of code into the standard elf |
| 201 | # parse_args and list_options functions. |
| 202 | # |
| 203 | PARSE_AND_LIST_PROLOGUE=' |
| 204 | #define OPTION_GOT 301 |
| 205 | ' |
| 206 | |
| 207 | PARSE_AND_LIST_LONGOPTS=' |
| 208 | { "got", required_argument, NULL, OPTION_GOT}, |
| 209 | ' |
| 210 | |
| 211 | PARSE_AND_LIST_OPTIONS=' |
| 212 | fprintf (file, _(" --got=<type> Specify GOT handling scheme\n")); |
| 213 | ' |
| 214 | |
| 215 | PARSE_AND_LIST_ARGS_CASES=' |
| 216 | case OPTION_GOT: |
| 217 | if (strcmp (optarg, "target") == 0) |
| 218 | got_handling = GOT_HANDLING_TARGET_DEFAULT; |
| 219 | else if (strcmp (optarg, "single") == 0) |
| 220 | got_handling = 0; |
| 221 | else if (strcmp (optarg, "negative") == 0) |
| 222 | got_handling = 1; |
| 223 | else if (strcmp (optarg, "multigot") == 0) |
| 224 | got_handling = 2; |
| 225 | else |
| 226 | einfo (_("%P: unrecognized --got argument '\''%s'\''\n"), optarg); |
| 227 | break; |
| 228 | ' |
| 229 | |
| 230 | # We have our own after_open and after_allocation functions, but they call |
| 231 | # the standard routines, so give them a different name. |
| 232 | LDEMUL_AFTER_OPEN=m68k_elf_after_open |
| 233 | LDEMUL_AFTER_ALLOCATION=m68k_elf_after_allocation |
| 234 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=elf_m68k_create_output_section_statements |