1 # This shell script emits a C file. -*- C -*-
2 # Copyright 1991, 1993, 1996, 1997, 1998, 1999, 2000, 2002
3 # Free Software Foundation, Inc.
5 # This file is part of GLD, the Gnu Linker.
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.
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.
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.
22 # This file is sourced from elf32.em, and defines extra arm-elf
25 cat >>e${EMULATION_NAME}.c <<EOF
30 static int no_pipeline_knowledge = 0;
31 static char * thumb_entry_symbol = NULL;
32 static bfd * bfd_for_interwork;
34 static void arm_elf_after_open PARAMS ((void));
35 static void arm_elf_set_bfd_for_interworking PARAMS ((lang_statement_union_type *));
36 static void arm_elf_before_allocation PARAMS ((void));
37 static void arm_elf_stringify_thumb_address PARAMS ((struct bfd_link_hash_entry *, char *));
38 static void arm_elf_finish PARAMS ((void));
42 gld${EMULATION_NAME}_before_parse ()
44 #ifndef TARGET_ /* I.e., if not generic. */
45 ldfile_set_output_arch ("`echo ${ARCH}`");
46 #endif /* not TARGET_ */
47 config.dynamic_link = ${DYNAMIC_LINK-true};
48 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo true ; else echo false ; fi`;
54 if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
56 /* The arm backend needs special fields in the output hash structure.
57 These will only be created if the output format is an arm format,
58 hence we do not support linking and changing output formats at the
59 same time. Use a link followed by objcopy to change output formats. */
60 einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
65 LANG_FOR_EACH_INPUT_STATEMENT (is)
67 bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
71 /* Call the standard elf routine. */
72 gld${EMULATION_NAME}_after_open ();
76 arm_elf_set_bfd_for_interworking (statement)
77 lang_statement_union_type * statement;
79 if (statement->header.type == lang_input_section_enum
80 && statement->input_section.ifile->just_syms_flag == false)
82 asection * i = statement->input_section.section;
83 asection * output_section = i->output_section;
85 ASSERT (output_section->owner == output_bfd);
87 if ((output_section->flags & SEC_HAS_CONTENTS) != 0
88 && (i->flags & SEC_NEVER_LOAD) == 0
89 && ! i->owner->output_has_begun)
91 bfd_for_interwork = i->owner;
92 bfd_for_interwork->output_has_begun = true;
98 arm_elf_before_allocation ()
102 /* Call the standard elf routine. */
103 gld${EMULATION_NAME}_before_allocation ();
105 if (link_info.input_bfds != NULL)
107 /* The interworking bfd must be the last one in the link. */
108 bfd_for_interwork = NULL;
109 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
110 tem->output_has_begun = false;
112 lang_for_each_statement (arm_elf_set_bfd_for_interworking);
113 ASSERT (bfd_for_interwork != NULL);
114 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
115 tem->output_has_begun = false;
117 bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
119 /* We should be able to set the size of the interworking stub section. */
121 /* Here we rummage through the found bfds to collect glue information. */
122 /* FIXME: should this be based on a command line option? krk@cygnus.com */
124 LANG_FOR_EACH_INPUT_STATEMENT (is)
126 if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
127 no_pipeline_knowledge))
129 /* xgettext:c-format */
130 einfo (_("Errors encountered processing file %s"), is->filename);
135 /* We have seen it all. Allocate it, and carry on. */
136 bfd_elf32_arm_allocate_interworking_sections (& link_info);
140 arm_elf_stringify_thumb_address (h, buffer)
141 struct bfd_link_hash_entry * h;
146 /* Get the address of the symbol. */
147 val = (h->u.def.value
148 + bfd_get_section_vma (output_bfd,
149 h->u.def.section->output_section)
150 + h->u.def.section->output_offset);
151 /* This is a thumb address, so the bottom bit of its address must be set. */
154 /* Now convert this value into a string. */
158 sprintf_vma (buffer + 2, val);
164 struct bfd_link_hash_entry * h;
166 /* Call the elf32.em routine. */
167 gld${EMULATION_NAME}_finish ();
169 if (thumb_entry_symbol != NULL)
171 static char buffer[32];
173 h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
176 if (h != (struct bfd_link_hash_entry *) NULL
177 && (h->type == bfd_link_hash_defined
178 || h->type == bfd_link_hash_defweak)
179 && h->u.def.section->output_section != NULL)
181 if (entry_symbol.name != NULL && entry_from_cmdline)
182 einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
183 thumb_entry_symbol, entry_symbol.name);
185 arm_elf_stringify_thumb_address (h, buffer);
186 entry_symbol.name = buffer;
189 einfo (_("%P: warning: cannot find thumb start symbol %s\n"),
193 /* If init is a Thumb function set the LSB. */
194 h = bfd_link_hash_lookup (link_info.hash, link_info.init_function, false,
197 if (h != (struct bfd_link_hash_entry *) NULL
198 && (h->type == bfd_link_hash_defined
199 || h->type == bfd_link_hash_defweak)
200 && ELF_ST_TYPE (((struct elf_link_hash_entry *)h)->type) == STT_ARM_TFUNC
201 && h->u.def.section->output_section != NULL)
203 static char buffer[32];
205 arm_elf_stringify_thumb_address (h, buffer);
206 link_info.init_function = buffer;
209 /* If fini is a Thumb function set the LSB. */
210 h = bfd_link_hash_lookup (link_info.hash, link_info.fini_function, false,
213 if (h != (struct bfd_link_hash_entry *) NULL
214 && (h->type == bfd_link_hash_defined
215 || h->type == bfd_link_hash_defweak)
216 && ELF_ST_TYPE (((struct elf_link_hash_entry *)h)->type) == STT_ARM_TFUNC
217 && h->u.def.section->output_section != NULL)
219 static char buffer[32];
221 arm_elf_stringify_thumb_address (h, buffer);
222 link_info.fini_function = buffer;
228 # Define some shell vars to insert bits of code into the standard elf
229 # parse_args and list_options functions.
231 PARSE_AND_LIST_PROLOGUE='
232 #define OPTION_THUMB_ENTRY 301
235 # Note we add 'n' to the short option list in order to prevent
236 # getopt_long_only from thinking that -n is a unique abbreviation
237 # for --no-pipeline-knowledge. There is no case to handle 'n' here
238 # however, so instead it will be passed back to parse_args() in
239 # lexsup.c where it will be handled.
240 PARSE_AND_LIST_SHORTOPTS=pn
242 PARSE_AND_LIST_LONGOPTS='
243 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
244 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
247 PARSE_AND_LIST_OPTIONS='
248 fprintf (file, _(" -p --no-pipeline-knowledge Stop the linker knowing about the pipeline length\n"));
249 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
252 PARSE_AND_LIST_ARGS_CASES='
254 no_pipeline_knowledge = 1;
257 case OPTION_THUMB_ENTRY:
258 thumb_entry_symbol = optarg;
262 # We have our own after_open and before_allocation functions, but they call
263 # the standard routines, so give them a different name.
264 LDEMUL_AFTER_OPEN=arm_elf_after_open
265 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
267 # Replace the elf before_parse function with our own.
268 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
270 # Call the extra arm-elf function
271 LDEMUL_FINISH=arm_elf_finish