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${EMULATION_NAME}.c <<EOF
27 static int no_pipeline_knowledge = 0;
28 static char *thumb_entry_symbol = NULL;
29 static bfd *bfd_for_interwork;
33 gld${EMULATION_NAME}_before_parse ()
35 #ifndef TARGET_ /* I.e., if not generic. */
36 ldfile_set_output_arch ("`echo ${ARCH}`");
37 #endif /* not TARGET_ */
38 config.dynamic_link = ${DYNAMIC_LINK-true};
39 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo true ; else echo false ; fi`;
42 static void arm_elf_after_open PARAMS ((void));
47 if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
49 /* The arm backend needs special fields in the output hash structure.
50 These will only be created if the output format is an arm format,
51 hence we do not support linking and changing output formats at the
52 same time. Use a link followed by objcopy to change output formats. */
53 einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
58 LANG_FOR_EACH_INPUT_STATEMENT (is)
60 bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
64 /* Call the standard elf routine. */
65 gld${EMULATION_NAME}_after_open ();
68 static void arm_elf_set_bfd_for_interworking
69 PARAMS ((lang_statement_union_type *));
72 arm_elf_set_bfd_for_interworking (statement)
73 lang_statement_union_type *statement;
75 if (statement->header.type == lang_input_section_enum
76 && statement->input_section.ifile->just_syms_flag == false)
78 asection *i = statement->input_section.section;
79 asection *output_section = i->output_section;
81 ASSERT (output_section->owner == output_bfd);
83 if ((output_section->flags & SEC_HAS_CONTENTS) != 0
84 && (i->flags & SEC_NEVER_LOAD) == 0
85 && ! i->owner->output_has_begun)
87 bfd_for_interwork = i->owner;
88 bfd_for_interwork->output_has_begun = true;
93 static void arm_elf_before_allocation PARAMS ((void));
96 arm_elf_before_allocation ()
100 /* Call the standard elf routine. */
101 gld${EMULATION_NAME}_before_allocation ();
103 if (link_info.input_bfds != NULL)
105 /* The interworking bfd must be the last one in the link. */
106 bfd_for_interwork = NULL;
107 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
108 tem->output_has_begun = false;
110 lang_for_each_statement (arm_elf_set_bfd_for_interworking);
111 ASSERT (bfd_for_interwork != NULL);
112 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
113 tem->output_has_begun = false;
115 bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
117 /* We should be able to set the size of the interworking stub section. */
119 /* Here we rummage through the found bfds to collect glue information. */
120 /* FIXME: should this be based on a command line option? krk@cygnus.com */
122 LANG_FOR_EACH_INPUT_STATEMENT (is)
124 if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
125 no_pipeline_knowledge))
127 /* xgettext:c-format */
128 einfo (_("Errors encountered processing file %s"), is->filename);
133 /* We have seen it all. Allocate it, and carry on. */
134 bfd_elf32_arm_allocate_interworking_sections (& link_info);
137 static void arm_elf_finish PARAMS ((void));
142 struct bfd_link_hash_entry * h;
144 /* Call the elf32.em routine. */
145 gld${EMULATION_NAME}_finish ();
147 if (thumb_entry_symbol == NULL)
150 h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
153 if (h != (struct bfd_link_hash_entry *) NULL
154 && (h->type == bfd_link_hash_defined
155 || h->type == bfd_link_hash_defweak)
156 && h->u.def.section->output_section != NULL)
158 static char buffer[32];
161 /* Special procesing is required for a Thumb entry symbol. The
162 bottom bit of its address must be set. */
163 val = (h->u.def.value
164 + bfd_get_section_vma (output_bfd,
165 h->u.def.section->output_section)
166 + h->u.def.section->output_offset);
170 /* Now convert this value into a string and store it in entry_symbol
171 where the lang_finish() function will pick it up. */
175 sprintf_vma (buffer + 2, val);
177 if (entry_symbol.name != NULL && entry_from_cmdline)
178 einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
179 thumb_entry_symbol, entry_symbol.name);
180 entry_symbol.name = buffer;
183 einfo (_("%P: warning: connot find thumb start symbol %s\n"),
189 # Define some shell vars to insert bits of code into the standard elf
190 # parse_args and list_options functions.
192 PARSE_AND_LIST_PROLOGUE='
193 #define OPTION_THUMB_ENTRY 301
196 # Note we add 'n' to the short option list in order to prevent
197 # getopt_long_only from thinking that -n is a unique abbreviation
198 # for --no-pipeline-knowledge. There is no case to handle 'n' here
199 # however, so instead it will be passed back to parse_args() in
200 # lexsup.c where it will be handled.
201 PARSE_AND_LIST_SHORTOPTS=pn
203 PARSE_AND_LIST_LONGOPTS='
204 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
205 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
208 PARSE_AND_LIST_OPTIONS='
209 fprintf (file, _(" -p --no-pipeline-knowledge Stop the linker knowing about the pipeline length\n"));
210 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
213 PARSE_AND_LIST_ARGS_CASES='
215 no_pipeline_knowledge = 1;
218 case OPTION_THUMB_ENTRY:
219 thumb_entry_symbol = optarg;
223 # We have our own after_open and before_allocation functions, but they call
224 # the standard routines, so give them a different name.
225 LDEMUL_AFTER_OPEN=arm_elf_after_open
226 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
228 # Replace the elf before_parse function with our own.
229 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
231 # Call the extra arm-elf function
232 LDEMUL_FINISH=arm_elf_finish