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.
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${EMULATION_NAME}.c <<EOF
27 static int no_pipeline_knowledge = 0;
28 static char *thumb_entry_symbol = NULL;
29 static bfd *bfd_for_interwork;
30 static int byteswap_code = 0;
33 gld${EMULATION_NAME}_before_parse (void)
35 #ifndef TARGET_ /* I.e., if not generic. */
36 ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
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`;
43 arm_elf_after_open (void)
45 if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
47 /* The arm backend needs special fields in the output hash structure.
48 These will only be created if the output format is an arm format,
49 hence we do not support linking and changing output formats at the
50 same time. Use a link followed by objcopy to change output formats. */
51 einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
56 LANG_FOR_EACH_INPUT_STATEMENT (is)
58 bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
62 /* Call the standard elf routine. */
63 gld${EMULATION_NAME}_after_open ();
67 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
69 if (statement->header.type == lang_input_section_enum
70 && !statement->input_section.ifile->just_syms_flag)
72 asection *i = statement->input_section.section;
73 asection *output_section = i->output_section;
75 ASSERT (output_section->owner == output_bfd);
77 if ((output_section->flags & SEC_HAS_CONTENTS) != 0
78 && (i->flags & SEC_NEVER_LOAD) == 0
79 && ! i->owner->output_has_begun)
81 bfd_for_interwork = i->owner;
82 bfd_for_interwork->output_has_begun = TRUE;
88 arm_elf_before_allocation (void)
92 /* Call the standard elf routine. */
93 gld${EMULATION_NAME}_before_allocation ();
95 if (link_info.input_bfds != NULL)
97 /* The interworking bfd must be the last one in the link. */
98 bfd_for_interwork = NULL;
99 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
100 tem->output_has_begun = FALSE;
102 lang_for_each_statement (arm_elf_set_bfd_for_interworking);
103 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
104 tem->output_has_begun = FALSE;
106 /* If bfd_for_interwork is NULL, then there are no loadable sections
107 with real contents to be linked, so we are not going to have to
108 create any interworking stubs, so it is OK not to call
109 bfd_elf32_arm_get_bfd_for_interworking. */
110 if (bfd_for_interwork != NULL)
111 bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
113 /* We should be able to set the size of the interworking stub section. */
115 /* Here we rummage through the found bfds to collect glue information. */
116 /* FIXME: should this be based on a command line option? krk@cygnus.com */
118 LANG_FOR_EACH_INPUT_STATEMENT (is)
120 if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
121 no_pipeline_knowledge,
124 /* xgettext:c-format */
125 einfo (_("Errors encountered processing file %s"), is->filename);
130 /* We have seen it all. Allocate it, and carry on. */
131 bfd_elf32_arm_allocate_interworking_sections (& link_info);
135 arm_elf_finish (void)
137 struct bfd_link_hash_entry * h;
139 /* Call the elf32.em routine. */
140 gld${EMULATION_NAME}_finish ();
142 if (thumb_entry_symbol == NULL)
145 h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
148 if (h != (struct bfd_link_hash_entry *) NULL
149 && (h->type == bfd_link_hash_defined
150 || h->type == bfd_link_hash_defweak)
151 && h->u.def.section->output_section != NULL)
153 static char buffer[32];
156 /* Special procesing is required for a Thumb entry symbol. The
157 bottom bit of its address must be set. */
158 val = (h->u.def.value
159 + bfd_get_section_vma (output_bfd,
160 h->u.def.section->output_section)
161 + h->u.def.section->output_offset);
165 /* Now convert this value into a string and store it in entry_symbol
166 where the lang_finish() function will pick it up. */
170 sprintf_vma (buffer + 2, val);
172 if (entry_symbol.name != NULL && entry_from_cmdline)
173 einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
174 thumb_entry_symbol, entry_symbol.name);
175 entry_symbol.name = buffer;
178 einfo (_("%P: warning: connot find thumb start symbol %s\n"),
184 # Define some shell vars to insert bits of code into the standard elf
185 # parse_args and list_options functions.
187 PARSE_AND_LIST_PROLOGUE='
188 #define OPTION_THUMB_ENTRY 301
189 #define OPTION_BE8 302
192 PARSE_AND_LIST_SHORTOPTS=p
194 PARSE_AND_LIST_LONGOPTS='
195 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
196 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
197 { "be8", no_argument, NULL, OPTION_BE8},
200 PARSE_AND_LIST_OPTIONS='
201 fprintf (file, _(" -p --no-pipeline-knowledge Stop the linker knowing about the pipeline length\n"));
202 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
203 fprintf (file, _(" --be8 Oputput BE8 format image\n"));
206 PARSE_AND_LIST_ARGS_CASES='
208 no_pipeline_knowledge = 1;
211 case OPTION_THUMB_ENTRY:
212 thumb_entry_symbol = optarg;
220 # We have our own after_open and before_allocation functions, but they call
221 # the standard routines, so give them a different name.
222 LDEMUL_AFTER_OPEN=arm_elf_after_open
223 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
225 # Replace the elf before_parse function with our own.
226 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
228 # Call the extra arm-elf function
229 LDEMUL_FINISH=arm_elf_finish