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 test -z $TARGET2_TYPE && TARGET2_TYPE="rel"
26 cat >>e${EMULATION_NAME}.c <<EOF
28 static int no_pipeline_knowledge = 0;
29 static char *thumb_entry_symbol = NULL;
30 static bfd *bfd_for_interwork;
31 static int byteswap_code = 0;
32 static int target1_is_rel = 0${TARGET1_IS_REL};
33 static char *target2_type = "${TARGET2_TYPE}";
36 gld${EMULATION_NAME}_before_parse (void)
38 #ifndef TARGET_ /* I.e., if not generic. */
39 ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
40 #endif /* not TARGET_ */
41 config.dynamic_link = ${DYNAMIC_LINK-TRUE};
42 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
46 arm_elf_after_open (void)
48 if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
50 /* The arm backend needs special fields in the output hash structure.
51 These will only be created if the output format is an arm format,
52 hence we do not support linking and changing output formats at the
53 same time. Use a link followed by objcopy to change output formats. */
54 einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
59 LANG_FOR_EACH_INPUT_STATEMENT (is)
61 bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
65 /* Call the standard elf routine. */
66 gld${EMULATION_NAME}_after_open ();
70 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
72 if (statement->header.type == lang_input_section_enum
73 && !statement->input_section.ifile->just_syms_flag
74 && (statement->input_section.section->flags & SEC_EXCLUDE) == 0)
76 asection *i = statement->input_section.section;
77 asection *output_section = i->output_section;
79 ASSERT (output_section->owner == output_bfd);
81 /* Don't attach the interworking stubs to a dynamic object, to
82 an empty section, etc. */
83 if ((output_section->flags & SEC_HAS_CONTENTS) != 0
84 && (i->flags & SEC_NEVER_LOAD) == 0
85 && ! (i->owner->flags & DYNAMIC)
86 && ! i->owner->output_has_begun)
88 bfd_for_interwork = i->owner;
89 bfd_for_interwork->output_has_begun = TRUE;
95 arm_elf_before_allocation (void)
99 /* Call the standard elf routine. */
100 gld${EMULATION_NAME}_before_allocation ();
102 if (link_info.input_bfds != NULL)
104 /* The interworking bfd must be the last one in the link. */
105 bfd_for_interwork = NULL;
106 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
107 tem->output_has_begun = FALSE;
109 lang_for_each_statement (arm_elf_set_bfd_for_interworking);
110 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
111 tem->output_has_begun = FALSE;
113 /* If bfd_for_interwork is NULL, then there are no loadable sections
114 with real contents to be linked, so we are not going to have to
115 create any interworking stubs, so it is OK not to call
116 bfd_elf32_arm_get_bfd_for_interworking. */
117 if (bfd_for_interwork != NULL)
118 bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
120 /* We should be able to set the size of the interworking stub section. */
122 /* Here we rummage through the found bfds to collect glue information. */
123 /* FIXME: should this be based on a command line option? krk@cygnus.com */
125 LANG_FOR_EACH_INPUT_STATEMENT (is)
127 if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
128 no_pipeline_knowledge,
131 /* xgettext:c-format */
132 einfo (_("Errors encountered processing file %s"), is->filename);
137 /* We have seen it all. Allocate it, and carry on. */
138 bfd_elf32_arm_allocate_interworking_sections (& link_info);
142 arm_elf_finish (void)
144 struct bfd_link_hash_entry * h;
146 /* Call the elf32.em routine. */
147 gld${EMULATION_NAME}_finish ();
149 if (thumb_entry_symbol == NULL)
152 h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
155 if (h != (struct bfd_link_hash_entry *) NULL
156 && (h->type == bfd_link_hash_defined
157 || h->type == bfd_link_hash_defweak)
158 && h->u.def.section->output_section != NULL)
160 static char buffer[32];
163 /* Special procesing is required for a Thumb entry symbol. The
164 bottom bit of its address must be set. */
165 val = (h->u.def.value
166 + bfd_get_section_vma (output_bfd,
167 h->u.def.section->output_section)
168 + h->u.def.section->output_offset);
172 /* Now convert this value into a string and store it in entry_symbol
173 where the lang_finish() function will pick it up. */
177 sprintf_vma (buffer + 2, val);
179 if (entry_symbol.name != NULL && entry_from_cmdline)
180 einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
181 thumb_entry_symbol, entry_symbol.name);
182 entry_symbol.name = buffer;
185 einfo (_("%P: warning: connot find thumb start symbol %s\n"),
189 /* This is a convenitent point to tell BFD about target specific flags.
190 After the output has been created, but before inputs are read. */
192 arm_elf_create_output_section_statements (void)
194 bfd_elf32_arm_set_target_relocs (&link_info, target1_is_rel, target2_type);
199 # Define some shell vars to insert bits of code into the standard elf
200 # parse_args and list_options functions.
202 PARSE_AND_LIST_PROLOGUE='
203 #define OPTION_THUMB_ENTRY 301
204 #define OPTION_BE8 302
205 #define OPTION_TARGET1_REL 303
206 #define OPTION_TARGET1_ABS 304
207 #define OPTION_TARGET2 305
210 PARSE_AND_LIST_SHORTOPTS=p
212 PARSE_AND_LIST_LONGOPTS='
213 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
214 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
215 { "be8", no_argument, NULL, OPTION_BE8},
216 { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
217 { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
218 { "target2", required_argument, NULL, OPTION_TARGET2},
221 PARSE_AND_LIST_OPTIONS='
222 fprintf (file, _(" -p --no-pipeline-knowledge Stop the linker knowing about the pipeline length\n"));
223 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
224 fprintf (file, _(" --be8 Oputput BE8 format image\n"));
225 fprintf (file, _(" --target1=rel Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
226 fprintf (file, _(" --target1=abs Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
227 fprintf (file, _(" --target2=<type> Specify definition of R_ARM_TARGET2\n"));
230 PARSE_AND_LIST_ARGS_CASES='
232 no_pipeline_knowledge = 1;
235 case OPTION_THUMB_ENTRY:
236 thumb_entry_symbol = optarg;
243 case OPTION_TARGET1_REL:
247 case OPTION_TARGET1_ABS:
252 target2_type = optarg;
256 # We have our own after_open and before_allocation functions, but they call
257 # the standard routines, so give them a different name.
258 LDEMUL_AFTER_OPEN=arm_elf_after_open
259 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
260 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
262 # Replace the elf before_parse function with our own.
263 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
265 # Call the extra arm-elf function
266 LDEMUL_FINISH=arm_elf_finish