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 char *thumb_entry_symbol = NULL;
29 static bfd *bfd_for_interwork;
30 static int byteswap_code = 0;
31 static int target1_is_rel = 0${TARGET1_IS_REL};
32 static char *target2_type = "${TARGET2_TYPE}";
35 gld${EMULATION_NAME}_before_parse (void)
37 #ifndef TARGET_ /* I.e., if not generic. */
38 ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
39 #endif /* not TARGET_ */
40 config.dynamic_link = ${DYNAMIC_LINK-TRUE};
41 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
45 arm_elf_after_open (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${EMULATION_NAME}_after_open ();
69 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
71 if (statement->header.type == lang_input_section_enum
72 && !statement->input_section.ifile->just_syms_flag
73 && (statement->input_section.section->flags & SEC_EXCLUDE) == 0)
75 asection *i = statement->input_section.section;
76 asection *output_section = i->output_section;
78 ASSERT (output_section->owner == output_bfd);
80 /* Don't attach the interworking stubs to a dynamic object, to
81 an empty section, etc. */
82 if ((output_section->flags & SEC_HAS_CONTENTS) != 0
83 && (i->flags & SEC_NEVER_LOAD) == 0
84 && ! (i->owner->flags & DYNAMIC)
85 && ! i->owner->output_has_begun)
87 bfd_for_interwork = i->owner;
88 bfd_for_interwork->output_has_begun = TRUE;
94 arm_elf_before_allocation (void)
98 /* Call the standard elf routine. */
99 gld${EMULATION_NAME}_before_allocation ();
101 if (link_info.input_bfds != NULL)
103 /* The interworking bfd must be the last one in the link. */
104 bfd_for_interwork = NULL;
105 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
106 tem->output_has_begun = FALSE;
108 lang_for_each_statement (arm_elf_set_bfd_for_interworking);
109 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
110 tem->output_has_begun = FALSE;
112 /* If bfd_for_interwork is NULL, then there are no loadable sections
113 with real contents to be linked, so we are not going to have to
114 create any interworking stubs, so it is OK not to call
115 bfd_elf32_arm_get_bfd_for_interworking. */
116 if (bfd_for_interwork != NULL)
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,
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_finish (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"),
187 /* This is a convenitent point to tell BFD about target specific flags.
188 After the output has been created, but before inputs are read. */
190 arm_elf_create_output_section_statements (void)
192 bfd_elf32_arm_set_target_relocs (&link_info, target1_is_rel, target2_type);
197 # Define some shell vars to insert bits of code into the standard elf
198 # parse_args and list_options functions.
200 PARSE_AND_LIST_PROLOGUE='
201 #define OPTION_THUMB_ENTRY 301
202 #define OPTION_BE8 302
203 #define OPTION_TARGET1_REL 303
204 #define OPTION_TARGET1_ABS 304
205 #define OPTION_TARGET2 305
208 PARSE_AND_LIST_SHORTOPTS=p
210 PARSE_AND_LIST_LONGOPTS='
211 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
212 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
213 { "be8", no_argument, NULL, OPTION_BE8},
214 { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
215 { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
216 { "target2", required_argument, NULL, OPTION_TARGET2},
219 PARSE_AND_LIST_OPTIONS='
220 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
221 fprintf (file, _(" --be8 Oputput BE8 format image\n"));
222 fprintf (file, _(" --target1=rel Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
223 fprintf (file, _(" --target1=abs Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
224 fprintf (file, _(" --target2=<type> Specify definition of R_ARM_TARGET2\n"));
227 PARSE_AND_LIST_ARGS_CASES='
229 /* Only here for backwards compatibility. */
232 case OPTION_THUMB_ENTRY:
233 thumb_entry_symbol = optarg;
240 case OPTION_TARGET1_REL:
244 case OPTION_TARGET1_ABS:
249 target2_type = optarg;
253 # We have our own after_open and before_allocation functions, but they call
254 # the standard routines, so give them a different name.
255 LDEMUL_AFTER_OPEN=arm_elf_after_open
256 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
257 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
259 # Replace the elf before_parse function with our own.
260 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
262 # Call the extra arm-elf function
263 LDEMUL_FINISH=arm_elf_finish