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${EMULATION_NAME}.c <<EOF
27 static int no_pipeline_knowledge = 0;
28 static char *thumb_entry_symbol = NULL;
29 static bfd *bfd_for_interwork;
30 static int byteswap_code = 0;
31 static int target1_is_rel = 0${TARGET1_IS_REL};
34 gld${EMULATION_NAME}_before_parse (void)
36 #ifndef TARGET_ /* I.e., if not generic. */
37 ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
38 #endif /* not TARGET_ */
39 config.dynamic_link = ${DYNAMIC_LINK-TRUE};
40 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
44 arm_elf_after_open (void)
46 if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
48 /* The arm backend needs special fields in the output hash structure.
49 These will only be created if the output format is an arm format,
50 hence we do not support linking and changing output formats at the
51 same time. Use a link followed by objcopy to change output formats. */
52 einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
57 LANG_FOR_EACH_INPUT_STATEMENT (is)
59 bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
63 /* Call the standard elf routine. */
64 gld${EMULATION_NAME}_after_open ();
68 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
70 if (statement->header.type == lang_input_section_enum
71 && !statement->input_section.ifile->just_syms_flag
72 && (statement->input_section.section->flags & SEC_EXCLUDE) == 0)
74 asection *i = statement->input_section.section;
75 asection *output_section = i->output_section;
77 ASSERT (output_section->owner == output_bfd);
79 if ((output_section->flags & SEC_HAS_CONTENTS) != 0
80 && (i->flags & SEC_NEVER_LOAD) == 0
81 && ! i->owner->output_has_begun)
83 bfd_for_interwork = i->owner;
84 bfd_for_interwork->output_has_begun = TRUE;
90 arm_elf_before_allocation (void)
94 /* Call the standard elf routine. */
95 gld${EMULATION_NAME}_before_allocation ();
97 if (link_info.input_bfds != NULL)
99 /* The interworking bfd must be the last one in the link. */
100 bfd_for_interwork = NULL;
101 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
102 tem->output_has_begun = FALSE;
104 lang_for_each_statement (arm_elf_set_bfd_for_interworking);
105 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
106 tem->output_has_begun = FALSE;
108 /* If bfd_for_interwork is NULL, then there are no loadable sections
109 with real contents to be linked, so we are not going to have to
110 create any interworking stubs, so it is OK not to call
111 bfd_elf32_arm_get_bfd_for_interworking. */
112 if (bfd_for_interwork != NULL)
113 bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
115 /* We should be able to set the size of the interworking stub section. */
117 /* Here we rummage through the found bfds to collect glue information. */
118 /* FIXME: should this be based on a command line option? krk@cygnus.com */
120 LANG_FOR_EACH_INPUT_STATEMENT (is)
122 if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
123 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);
138 arm_elf_finish (void)
140 struct bfd_link_hash_entry * h;
142 /* Call the elf32.em routine. */
143 gld${EMULATION_NAME}_finish ();
145 if (thumb_entry_symbol == NULL)
148 h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
151 if (h != (struct bfd_link_hash_entry *) NULL
152 && (h->type == bfd_link_hash_defined
153 || h->type == bfd_link_hash_defweak)
154 && h->u.def.section->output_section != NULL)
156 static char buffer[32];
159 /* Special procesing is required for a Thumb entry symbol. The
160 bottom bit of its address must be set. */
161 val = (h->u.def.value
162 + bfd_get_section_vma (output_bfd,
163 h->u.def.section->output_section)
164 + h->u.def.section->output_offset);
168 /* Now convert this value into a string and store it in entry_symbol
169 where the lang_finish() function will pick it up. */
173 sprintf_vma (buffer + 2, val);
175 if (entry_symbol.name != NULL && entry_from_cmdline)
176 einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
177 thumb_entry_symbol, entry_symbol.name);
178 entry_symbol.name = buffer;
181 einfo (_("%P: warning: connot find thumb start symbol %s\n"),
187 # Define some shell vars to insert bits of code into the standard elf
188 # parse_args and list_options functions.
190 PARSE_AND_LIST_PROLOGUE='
191 #define OPTION_THUMB_ENTRY 301
192 #define OPTION_BE8 302
193 #define OPTION_TARGET1_REL 303
194 #define OPTION_TARGET1_ABS 304
197 PARSE_AND_LIST_SHORTOPTS=p
199 PARSE_AND_LIST_LONGOPTS='
200 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
201 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
202 { "be8", no_argument, NULL, OPTION_BE8},
203 { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
204 { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
207 PARSE_AND_LIST_OPTIONS='
208 fprintf (file, _(" -p --no-pipeline-knowledge Stop the linker knowing about the pipeline length\n"));
209 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
210 fprintf (file, _(" --be8 Oputput BE8 format image\n"));
211 fprintf (file, _(" --target1-rel Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
212 fprintf (file, _(" --target1-abs Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
215 PARSE_AND_LIST_ARGS_CASES='
217 no_pipeline_knowledge = 1;
220 case OPTION_THUMB_ENTRY:
221 thumb_entry_symbol = optarg;
228 case OPTION_TARGET1_REL:
232 case OPTION_TARGET1_ABS:
237 # We have our own after_open and before_allocation functions, but they call
238 # the standard routines, so give them a different name.
239 LDEMUL_AFTER_OPEN=arm_elf_after_open
240 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
242 # Replace the elf before_parse function with our own.
243 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
245 # Call the extra arm-elf function
246 LDEMUL_FINISH=arm_elf_finish