| 1 | # This shell script emits a C file. -*- C -*- |
| 2 | # Copyright 1991, 1993, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004 |
| 3 | # Free Software Foundation, Inc. |
| 4 | # |
| 5 | # This file is part of GLD, the Gnu Linker. |
| 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 20 | # |
| 21 | |
| 22 | # This file is sourced from elf32.em, and defines extra arm-elf |
| 23 | # specific routines. |
| 24 | # |
| 25 | cat >>e${EMULATION_NAME}.c <<EOF |
| 26 | |
| 27 | static int no_pipeline_knowledge = 0; |
| 28 | static char *thumb_entry_symbol = NULL; |
| 29 | static bfd *bfd_for_interwork; |
| 30 | |
| 31 | static void |
| 32 | gld${EMULATION_NAME}_before_parse (void) |
| 33 | { |
| 34 | #ifndef TARGET_ /* I.e., if not generic. */ |
| 35 | ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown); |
| 36 | #endif /* not TARGET_ */ |
| 37 | config.dynamic_link = ${DYNAMIC_LINK-TRUE}; |
| 38 | config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`; |
| 39 | } |
| 40 | |
| 41 | static void |
| 42 | arm_elf_after_open (void) |
| 43 | { |
| 44 | if (strstr (bfd_get_target (output_bfd), "arm") == NULL) |
| 45 | { |
| 46 | /* The arm backend needs special fields in the output hash structure. |
| 47 | These will only be created if the output format is an arm format, |
| 48 | hence we do not support linking and changing output formats at the |
| 49 | same time. Use a link followed by objcopy to change output formats. */ |
| 50 | einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n"); |
| 51 | return; |
| 52 | } |
| 53 | |
| 54 | { |
| 55 | LANG_FOR_EACH_INPUT_STATEMENT (is) |
| 56 | { |
| 57 | bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | /* Call the standard elf routine. */ |
| 62 | gld${EMULATION_NAME}_after_open (); |
| 63 | } |
| 64 | |
| 65 | static void |
| 66 | arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement) |
| 67 | { |
| 68 | if (statement->header.type == lang_input_section_enum |
| 69 | && !statement->input_section.ifile->just_syms_flag) |
| 70 | { |
| 71 | asection *i = statement->input_section.section; |
| 72 | asection *output_section = i->output_section; |
| 73 | |
| 74 | ASSERT (output_section->owner == output_bfd); |
| 75 | |
| 76 | if ((output_section->flags & SEC_HAS_CONTENTS) != 0 |
| 77 | && (i->flags & SEC_NEVER_LOAD) == 0 |
| 78 | && ! i->owner->output_has_begun) |
| 79 | { |
| 80 | bfd_for_interwork = i->owner; |
| 81 | bfd_for_interwork->output_has_begun = TRUE; |
| 82 | } |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | static void |
| 87 | arm_elf_before_allocation (void) |
| 88 | { |
| 89 | bfd *tem; |
| 90 | |
| 91 | /* Call the standard elf routine. */ |
| 92 | gld${EMULATION_NAME}_before_allocation (); |
| 93 | |
| 94 | if (link_info.input_bfds != NULL) |
| 95 | { |
| 96 | /* The interworking bfd must be the last one in the link. */ |
| 97 | bfd_for_interwork = NULL; |
| 98 | for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next) |
| 99 | tem->output_has_begun = FALSE; |
| 100 | |
| 101 | lang_for_each_statement (arm_elf_set_bfd_for_interworking); |
| 102 | for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next) |
| 103 | tem->output_has_begun = FALSE; |
| 104 | |
| 105 | /* If bfd_for_interwork is NULL, then there are no loadable sections |
| 106 | with real contents to be linked, so we are not going to have to |
| 107 | create any interworking stubs, so it is OK not to call |
| 108 | bfd_elf32_arm_get_bfd_for_interworking. */ |
| 109 | if (bfd_for_interwork != NULL) |
| 110 | bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info); |
| 111 | } |
| 112 | /* We should be able to set the size of the interworking stub section. */ |
| 113 | |
| 114 | /* Here we rummage through the found bfds to collect glue information. */ |
| 115 | /* FIXME: should this be based on a command line option? krk@cygnus.com */ |
| 116 | { |
| 117 | LANG_FOR_EACH_INPUT_STATEMENT (is) |
| 118 | { |
| 119 | if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info, |
| 120 | no_pipeline_knowledge)) |
| 121 | { |
| 122 | /* xgettext:c-format */ |
| 123 | einfo (_("Errors encountered processing file %s"), is->filename); |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | /* We have seen it all. Allocate it, and carry on. */ |
| 129 | bfd_elf32_arm_allocate_interworking_sections (& link_info); |
| 130 | } |
| 131 | |
| 132 | static void |
| 133 | arm_elf_finish (void) |
| 134 | { |
| 135 | struct bfd_link_hash_entry * h; |
| 136 | |
| 137 | /* Call the elf32.em routine. */ |
| 138 | gld${EMULATION_NAME}_finish (); |
| 139 | |
| 140 | if (thumb_entry_symbol == NULL) |
| 141 | return; |
| 142 | |
| 143 | h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol, |
| 144 | FALSE, FALSE, TRUE); |
| 145 | |
| 146 | if (h != (struct bfd_link_hash_entry *) NULL |
| 147 | && (h->type == bfd_link_hash_defined |
| 148 | || h->type == bfd_link_hash_defweak) |
| 149 | && h->u.def.section->output_section != NULL) |
| 150 | { |
| 151 | static char buffer[32]; |
| 152 | bfd_vma val; |
| 153 | |
| 154 | /* Special procesing is required for a Thumb entry symbol. The |
| 155 | bottom bit of its address must be set. */ |
| 156 | val = (h->u.def.value |
| 157 | + bfd_get_section_vma (output_bfd, |
| 158 | h->u.def.section->output_section) |
| 159 | + h->u.def.section->output_offset); |
| 160 | |
| 161 | val |= 1; |
| 162 | |
| 163 | /* Now convert this value into a string and store it in entry_symbol |
| 164 | where the lang_finish() function will pick it up. */ |
| 165 | buffer[0] = '0'; |
| 166 | buffer[1] = 'x'; |
| 167 | |
| 168 | sprintf_vma (buffer + 2, val); |
| 169 | |
| 170 | if (entry_symbol.name != NULL && entry_from_cmdline) |
| 171 | einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"), |
| 172 | thumb_entry_symbol, entry_symbol.name); |
| 173 | entry_symbol.name = buffer; |
| 174 | } |
| 175 | else |
| 176 | einfo (_("%P: warning: connot find thumb start symbol %s\n"), |
| 177 | thumb_entry_symbol); |
| 178 | } |
| 179 | |
| 180 | EOF |
| 181 | |
| 182 | # Define some shell vars to insert bits of code into the standard elf |
| 183 | # parse_args and list_options functions. |
| 184 | # |
| 185 | PARSE_AND_LIST_PROLOGUE=' |
| 186 | #define OPTION_THUMB_ENTRY 301 |
| 187 | ' |
| 188 | |
| 189 | PARSE_AND_LIST_SHORTOPTS=p |
| 190 | |
| 191 | PARSE_AND_LIST_LONGOPTS=' |
| 192 | { "no-pipeline-knowledge", no_argument, NULL, '\'p\''}, |
| 193 | { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY}, |
| 194 | ' |
| 195 | |
| 196 | PARSE_AND_LIST_OPTIONS=' |
| 197 | fprintf (file, _(" -p --no-pipeline-knowledge Stop the linker knowing about the pipeline length\n")); |
| 198 | fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n")); |
| 199 | ' |
| 200 | |
| 201 | PARSE_AND_LIST_ARGS_CASES=' |
| 202 | case '\'p\'': |
| 203 | no_pipeline_knowledge = 1; |
| 204 | break; |
| 205 | |
| 206 | case OPTION_THUMB_ENTRY: |
| 207 | thumb_entry_symbol = optarg; |
| 208 | break; |
| 209 | ' |
| 210 | |
| 211 | # We have our own after_open and before_allocation functions, but they call |
| 212 | # the standard routines, so give them a different name. |
| 213 | LDEMUL_AFTER_OPEN=arm_elf_after_open |
| 214 | LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation |
| 215 | |
| 216 | # Replace the elf before_parse function with our own. |
| 217 | LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse |
| 218 | |
| 219 | # Call the extra arm-elf function |
| 220 | LDEMUL_FINISH=arm_elf_finish |