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}";
33 static int fix_v4bx = 0;
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,
130 /* xgettext:c-format */
131 einfo (_("Errors encountered processing file %s"), is->filename);
136 /* We have seen it all. Allocate it, and carry on. */
137 bfd_elf32_arm_allocate_interworking_sections (& link_info);
141 arm_elf_finish (void)
143 struct bfd_link_hash_entry * h;
145 /* Call the elf32.em routine. */
146 gld${EMULATION_NAME}_finish ();
148 if (thumb_entry_symbol == NULL)
151 h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
154 if (h != (struct bfd_link_hash_entry *) NULL
155 && (h->type == bfd_link_hash_defined
156 || h->type == bfd_link_hash_defweak)
157 && h->u.def.section->output_section != NULL)
159 static char buffer[32];
162 /* Special procesing is required for a Thumb entry symbol. The
163 bottom bit of its address must be set. */
164 val = (h->u.def.value
165 + bfd_get_section_vma (output_bfd,
166 h->u.def.section->output_section)
167 + h->u.def.section->output_offset);
171 /* Now convert this value into a string and store it in entry_symbol
172 where the lang_finish() function will pick it up. */
176 sprintf_vma (buffer + 2, val);
178 if (entry_symbol.name != NULL && entry_from_cmdline)
179 einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
180 thumb_entry_symbol, entry_symbol.name);
181 entry_symbol.name = buffer;
184 einfo (_("%P: warning: connot find thumb start symbol %s\n"),
188 /* This is a convenitent point to tell BFD about target specific flags.
189 After the output has been created, but before inputs are read. */
191 arm_elf_create_output_section_statements (void)
193 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
208 #define OPTION_FIX_V4BX 306
211 PARSE_AND_LIST_SHORTOPTS=p
213 PARSE_AND_LIST_LONGOPTS='
214 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
215 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
216 { "be8", no_argument, NULL, OPTION_BE8},
217 { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
218 { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
219 { "target2", required_argument, NULL, OPTION_TARGET2},
220 { "fix-v4bx", no_argument, NULL, OPTION_FIX_V4BX},
223 PARSE_AND_LIST_OPTIONS='
224 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
225 fprintf (file, _(" --be8 Oputput BE8 format image\n"));
226 fprintf (file, _(" --target1=rel Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
227 fprintf (file, _(" --target1=abs Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
228 fprintf (file, _(" --target2=<type> Specify definition of R_ARM_TARGET2\n"));
229 fprintf (file, _(" --fix-v4bx Rewrite BX rn as MOV pc, rn for ARMv4\n"));
232 PARSE_AND_LIST_ARGS_CASES='
234 /* Only here for backwards compatibility. */
237 case OPTION_THUMB_ENTRY:
238 thumb_entry_symbol = optarg;
245 case OPTION_TARGET1_REL:
249 case OPTION_TARGET1_ABS:
254 target2_type = optarg;
257 case OPTION_FIX_V4BX:
262 # We have our own after_open and before_allocation functions, but they call
263 # the standard routines, so give them a different name.
264 LDEMUL_AFTER_OPEN=arm_elf_after_open
265 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
266 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
268 # Replace the elf before_parse function with our own.
269 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
271 # Call the extra arm-elf function
272 LDEMUL_FINISH=arm_elf_finish