1 # This shell script emits a C file. -*- C -*-
2 # Copyright 1991, 1993, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
4 # Free Software Foundation, Inc.
6 # This file is part of GLD, the Gnu Linker.
8 # This program is free software; you can redistribute it and/or modify
9 # it under the terms of the GNU General Public License as published by
10 # the Free Software Foundation; either version 2 of the License, or
11 # (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program; if not, write to the Free Software
20 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
23 # This file is sourced from elf32.em, and defines extra arm-elf
26 test -z "$TARGET2_TYPE" && TARGET2_TYPE="rel"
27 cat >>e${EMULATION_NAME}.c <<EOF
31 static char *thumb_entry_symbol = NULL;
32 static bfd *bfd_for_interwork;
33 static int byteswap_code = 0;
34 static int target1_is_rel = 0${TARGET1_IS_REL};
35 static char *target2_type = "${TARGET2_TYPE}";
36 static int fix_v4bx = 0;
37 static int use_blx = 0;
38 static bfd_arm_vfp11_fix vfp11_denorm_fix = BFD_ARM_VFP11_FIX_DEFAULT;
41 gld${EMULATION_NAME}_before_parse (void)
43 #ifndef TARGET_ /* I.e., if not generic. */
44 ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
45 #endif /* not TARGET_ */
46 config.dynamic_link = ${DYNAMIC_LINK-TRUE};
47 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
51 arm_elf_after_open (void)
53 if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
55 /* The arm backend needs special fields in the output hash structure.
56 These will only be created if the output format is an arm format,
57 hence we do not support linking and changing output formats at the
58 same time. Use a link followed by objcopy to change output formats. */
59 einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
64 LANG_FOR_EACH_INPUT_STATEMENT (is)
66 bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
70 /* Call the standard elf routine. */
71 gld${EMULATION_NAME}_after_open ();
75 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
77 if (statement->header.type == lang_input_section_enum)
79 asection *i = statement->input_section.section;
81 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
82 && (i->flags & SEC_EXCLUDE) == 0)
84 asection *output_section = i->output_section;
86 ASSERT (output_section->owner == output_bfd);
88 /* Don't attach the interworking stubs to a dynamic object, to
89 an empty section, etc. */
90 if ((output_section->flags & SEC_HAS_CONTENTS) != 0
91 && (i->flags & SEC_NEVER_LOAD) == 0
92 && ! (i->owner->flags & DYNAMIC)
93 && ! i->owner->output_has_begun)
95 bfd_for_interwork = i->owner;
96 bfd_for_interwork->output_has_begun = TRUE;
103 arm_elf_before_allocation (void)
107 if (link_info.input_bfds != NULL)
109 /* The interworking bfd must be the last one in the link. */
110 bfd_for_interwork = NULL;
111 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
112 tem->output_has_begun = FALSE;
114 lang_for_each_statement (arm_elf_set_bfd_for_interworking);
115 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
116 tem->output_has_begun = FALSE;
118 /* If bfd_for_interwork is NULL, then there are no loadable sections
119 with real contents to be linked, so we are not going to have to
120 create any interworking stubs, so it is OK not to call
121 bfd_elf32_arm_get_bfd_for_interworking. */
122 if (bfd_for_interwork != NULL)
123 bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
126 bfd_elf32_arm_set_byteswap_code (&link_info, byteswap_code);
128 /* Choose type of VFP11 erratum fix, or warn if specified fix is unnecessary
129 due to architecture version. */
130 bfd_elf32_arm_set_vfp11_fix (output_bfd, &link_info);
132 /* We should be able to set the size of the interworking stub section. We
133 can't do it until later if we have dynamic sections, though. */
134 if (! elf_hash_table (&link_info)->dynamic_sections_created)
136 /* Here we rummage through the found bfds to collect glue information. */
137 LANG_FOR_EACH_INPUT_STATEMENT (is)
139 /* Initialise mapping tables for code/data. */
140 bfd_elf32_arm_init_maps (is->the_bfd);
142 if (!bfd_elf32_arm_process_before_allocation (is->the_bfd,
144 || !bfd_elf32_arm_vfp11_erratum_scan (is->the_bfd, &link_info))
145 /* xgettext:c-format */
146 einfo (_("Errors encountered processing file %s"), is->filename);
150 /* Call the standard elf routine. */
151 gld${EMULATION_NAME}_before_allocation ();
153 /* We have seen it all. Allocate it, and carry on. */
154 bfd_elf32_arm_allocate_interworking_sections (& link_info);
158 arm_elf_after_allocation (void)
160 /* Call the standard elf routine. */
161 after_allocation_default ();
164 LANG_FOR_EACH_INPUT_STATEMENT (is)
166 /* Figure out where VFP11 erratum veneers (and the labels returning
167 from same) have been placed. */
168 bfd_elf32_arm_vfp11_fix_veneer_locations (is->the_bfd, &link_info);
174 arm_elf_finish (void)
176 struct bfd_link_hash_entry * h;
178 /* Call the elf32.em routine. */
179 gld${EMULATION_NAME}_finish ();
181 if (thumb_entry_symbol)
183 h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
188 struct elf_link_hash_entry * eh;
190 if (!entry_symbol.name)
193 h = bfd_link_hash_lookup (link_info.hash, entry_symbol.name,
195 eh = (struct elf_link_hash_entry *)h;
196 if (!h || ELF_ST_TYPE(eh->type) != STT_ARM_TFUNC)
201 if (h != (struct bfd_link_hash_entry *) NULL
202 && (h->type == bfd_link_hash_defined
203 || h->type == bfd_link_hash_defweak)
204 && h->u.def.section->output_section != NULL)
206 static char buffer[32];
209 /* Special procesing is required for a Thumb entry symbol. The
210 bottom bit of its address must be set. */
211 val = (h->u.def.value
212 + bfd_get_section_vma (output_bfd,
213 h->u.def.section->output_section)
214 + h->u.def.section->output_offset);
218 /* Now convert this value into a string and store it in entry_symbol
219 where the lang_finish() function will pick it up. */
223 sprintf_vma (buffer + 2, val);
225 if (thumb_entry_symbol != NULL && entry_symbol.name != NULL
226 && entry_from_cmdline)
227 einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
228 thumb_entry_symbol, entry_symbol.name);
229 entry_symbol.name = buffer;
232 einfo (_("%P: warning: connot find thumb start symbol %s\n"),
236 /* This is a convenitent point to tell BFD about target specific flags.
237 After the output has been created, but before inputs are read. */
239 arm_elf_create_output_section_statements (void)
241 bfd_elf32_arm_set_target_relocs (&link_info, target1_is_rel, target2_type,
242 fix_v4bx, use_blx, vfp11_denorm_fix);
247 # Define some shell vars to insert bits of code into the standard elf
248 # parse_args and list_options functions.
250 PARSE_AND_LIST_PROLOGUE='
251 #define OPTION_THUMB_ENTRY 301
252 #define OPTION_BE8 302
253 #define OPTION_TARGET1_REL 303
254 #define OPTION_TARGET1_ABS 304
255 #define OPTION_TARGET2 305
256 #define OPTION_FIX_V4BX 306
257 #define OPTION_USE_BLX 307
258 #define OPTION_VFP11_DENORM_FIX 308
261 PARSE_AND_LIST_SHORTOPTS=p
263 PARSE_AND_LIST_LONGOPTS='
264 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
265 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
266 { "be8", no_argument, NULL, OPTION_BE8},
267 { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
268 { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
269 { "target2", required_argument, NULL, OPTION_TARGET2},
270 { "fix-v4bx", no_argument, NULL, OPTION_FIX_V4BX},
271 { "use-blx", no_argument, NULL, OPTION_USE_BLX},
272 { "vfp11-denorm-fix", required_argument, NULL, OPTION_VFP11_DENORM_FIX},
275 PARSE_AND_LIST_OPTIONS='
276 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
277 fprintf (file, _(" --be8 Oputput BE8 format image\n"));
278 fprintf (file, _(" --target1=rel Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
279 fprintf (file, _(" --target1=abs Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
280 fprintf (file, _(" --target2=<type> Specify definition of R_ARM_TARGET2\n"));
281 fprintf (file, _(" --fix-v4bx Rewrite BX rn as MOV pc, rn for ARMv4\n"));
282 fprintf (file, _(" --use-blx Enable use of BLX instructions\n"));
283 fprintf (file, _(" --vfp11-denorm-fix Specify how to fix VFP11 denorm erratum\n"));
286 PARSE_AND_LIST_ARGS_CASES='
288 /* Only here for backwards compatibility. */
291 case OPTION_THUMB_ENTRY:
292 thumb_entry_symbol = optarg;
299 case OPTION_TARGET1_REL:
303 case OPTION_TARGET1_ABS:
308 target2_type = optarg;
311 case OPTION_FIX_V4BX:
319 case OPTION_VFP11_DENORM_FIX:
320 if (strcmp (optarg, "none") == 0)
321 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_NONE;
322 else if (strcmp (optarg, "scalar") == 0)
323 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_SCALAR;
324 else if (strcmp (optarg, "vector") == 0)
325 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_VECTOR;
327 einfo (_("Unrecognized VFP11 fix type '\''%s'\''.\n"), optarg);
331 # We have our own after_open and before_allocation functions, but they call
332 # the standard routines, so give them a different name.
333 LDEMUL_AFTER_OPEN=arm_elf_after_open
334 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
335 LDEMUL_AFTER_ALLOCATION=arm_elf_after_allocation
336 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
338 # Replace the elf before_parse function with our own.
339 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
341 # Call the extra arm-elf function
342 LDEMUL_FINISH=arm_elf_finish