| blob | 0682f5ca9809e2001a9972e72ef9d13b56d66d91 |
1 # This shell script emits a C file. -*- C -*-
2 # Copyright 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
3 #
4 # This file is part of GLD, the Gnu Linker.
5 #
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
10 #
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
15 #
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 #
21 # This file is sourced from elf32.em, and defines extra sh64
22 # specific routines.
23 #
25 LDEMUL_AFTER_ALLOCATION=sh64_elf_${EMULATION_NAME}_after_allocation
26 LDEMUL_BEFORE_ALLOCATION=sh64_elf_${EMULATION_NAME}_before_allocation
28 cat >>e${EMULATION_NAME}.c <<EOF
30 #include "libiberty.h"
31 #include "libbfd.h"
32 #include "elf-bfd.h"
33 #include "elf/sh.h"
34 #include "elf32-sh64.h"
36 /* Check if we need a .cranges section and create it if it's not in any
37 input file. It might seem better to always create it and if unneeded,
38 discard it, but I don't find a simple way to discard it totally from
39 the output.
41 Putting it here instead of as a elf_backend_always_size_sections hook
42 in elf32-sh64.c, means that we have access to linker command line
43 options here, and we can access input sections in the order in which
44 they will be linked. */
46 static void
47 sh64_elf_${EMULATION_NAME}_before_allocation (void)
48 {
49 asection *cranges;
50 asection *osec;
52 /* Call main function; we're just extending it. */
53 gld${EMULATION_NAME}_before_allocation ();
55 cranges = bfd_get_section_by_name (output_bfd, SH64_CRANGES_SECTION_NAME);
57 if (cranges != NULL)
58 {
59 if (command_line.relax)
60 {
61 /* FIXME: Look through incoming sections with .cranges
62 descriptors, build up some kind of descriptors that the
63 relaxing function will pick up and adjust, or perhaps make it
64 find and adjust an associated .cranges descriptor. We could
65 also look through incoming relocs and kill the ones marking
66 relaxation areas, but that wouldn't be TRT. */
67 einfo
68 (_("%P: Sorry, turning off relaxing: .cranges section in input.\n"));
69 einfo (_(" A .cranges section is present in:\n"));
71 {
72 LANG_FOR_EACH_INPUT_STATEMENT (f)
73 {
74 asection *input_cranges
75 = bfd_get_section_by_name (f->the_bfd,
76 SH64_CRANGES_SECTION_NAME);
77 if (input_cranges != NULL)
78 einfo (" %I\n", f);
79 }
80 }
82 command_line.relax = FALSE;
83 }
85 /* We wouldn't need to do anything when there's already a .cranges
86 section (and have a return here), except that we need to set the
87 section flags right for output sections that *don't* need a
88 .cranges section. */
89 }
91 if (command_line.relax)
92 {
93 LANG_FOR_EACH_INPUT_STATEMENT (f)
94 {
95 if (bfd_get_flavour (f->the_bfd) == bfd_target_elf_flavour)
96 {
97 asection *isec;
98 for (isec = f->the_bfd->sections;
99 isec != NULL;
100 isec = isec->next)
101 {
102 if (elf_section_data (isec)->this_hdr.sh_flags
103 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
104 {
105 einfo (_("%P: Sorry, turning off relaxing: SHmedia sections present.\n"));
106 einfo (" %I\n", f);
107 command_line.relax = FALSE;
108 goto done_scanning_shmedia_sections;
109 }
110 }
111 }
112 }
113 }
114 done_scanning_shmedia_sections:
116 /* For each non-empty input section in each output section, check if it
117 has the same SH64-specific flags. If some input section differs, we
118 need a .cranges section. */
119 for (osec = output_bfd->sections;
120 osec != NULL;
121 osec = osec->next)
122 {
123 struct sh64_section_data *sh64_sec_data;
124 bfd_vma oflags_isa = 0;
125 bfd_vma iflags_isa = 0;
127 if (bfd_get_flavour (output_bfd) != bfd_target_elf_flavour)
128 einfo (_("%FError: non-ELF output formats are not supported by this target's linker.\n"));
130 sh64_sec_data = sh64_elf_section_data (osec)->sh64_info;
132 /* Omit excluded or garbage-collected sections. */
133 if (bfd_get_section_flags (output_bfd, osec) & SEC_EXCLUDE)
134 continue;
136 /* Make sure we have the target section data initialized. */
137 if (sh64_sec_data == NULL)
138 {
139 sh64_sec_data = xcalloc (1, sizeof (struct sh64_section_data));
140 sh64_elf_section_data (osec)->sh64_info = sh64_sec_data;
141 }
143 /* First find an input section so we have flags to compare with; the
144 flags in the output section are not valid. */
145 {
146 LANG_FOR_EACH_INPUT_STATEMENT (f)
147 {
148 asection *isec;
150 for (isec = f->the_bfd->sections;
151 isec != NULL;
152 isec = isec->next)
153 {
154 if (isec->output_section == osec
155 && isec->size != 0
156 && (bfd_get_section_flags (isec->owner, isec)
157 & SEC_EXCLUDE) == 0)
158 {
159 oflags_isa
160 = (elf_section_data (isec)->this_hdr.sh_flags
161 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
162 goto break_1;
163 }
164 }
165 }
166 }
168 break_1:
170 /* Check that all input sections have the same contents-type flags
171 as the first input section. */
172 {
173 LANG_FOR_EACH_INPUT_STATEMENT (f)
174 {
175 asection *isec;
177 for (isec = f->the_bfd->sections;
178 isec != NULL;
179 isec = isec->next)
180 {
181 if (isec->output_section == osec
182 && isec->size != 0
183 && (bfd_get_section_flags (isec->owner, isec)
184 & SEC_EXCLUDE) == 0)
185 {
186 iflags_isa
187 = (elf_section_data (isec)->this_hdr.sh_flags
188 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
190 /* If flags don't agree, we need a .cranges section.
191 Create it here if it did not exist through input
192 sections. */
193 if (iflags_isa != oflags_isa)
194 {
195 if (cranges == NULL)
196 {
197 /* This section will be *appended* to
198 sections, so the outer iteration will reach
199 it in due time and set
200 sh64_elf_section_data; no need to set it
201 specifically here. */
202 cranges
203 = bfd_make_section (output_bfd,
204 SH64_CRANGES_SECTION_NAME);
205 if (cranges == NULL
206 || !bfd_set_section_flags (output_bfd,
207 cranges,
208 SEC_LINKER_CREATED
209 | SEC_KEEP
210 | SEC_HAS_CONTENTS
211 | SEC_DEBUGGING))
212 einfo
213 (_("%P%E%F: Can't make .cranges section\n"));
214 }
216 /* We don't need to look at more input sections,
217 and we know this section will have mixed
218 contents. */
219 goto break_2;
220 }
221 }
222 }
223 }
224 }
226 /* If we got here, then all input sections in this output section
227 have the same contents flag. Put that where we expect to see
228 contents flags. We don't need to do this for sections that will
229 need additional, linker-generated .cranges entries. */
230 sh64_sec_data->contents_flags = iflags_isa;
232 break_2:
233 ;
234 }
235 }
237 /* Size up and extend the .cranges section, merging generated entries. */
239 static void
240 sh64_elf_${EMULATION_NAME}_after_allocation (void)
241 {
242 bfd_vma new_cranges = 0;
243 bfd_vma cranges_growth = 0;
244 asection *osec;
245 bfd_byte *crangesp;
247 asection *cranges
248 = bfd_get_section_by_name (output_bfd, SH64_CRANGES_SECTION_NAME);
250 /* If this ever starts doing something, we will pick it up. */
251 after_allocation_default ();
253 /* If there is no .cranges section, it is because it was seen earlier on
254 that none was needed. Otherwise it must have been created then, or
255 be present in input. */
256 if (cranges == NULL)
257 return;
259 /* First, we set the ISA flags for each output section according to the
260 first non-discarded section. For each input section in osec, we
261 check if it has the same flags. If it does not, we set flags to mark
262 a mixed section (and exit the loop early). */
263 for (osec = output_bfd->sections;
264 osec != NULL;
265 osec = osec->next)
266 {
267 bfd_vma oflags_isa = 0;
268 bfd_boolean need_check_cranges = FALSE;
270 /* Omit excluded or garbage-collected sections. */
271 if (bfd_get_section_flags (output_bfd, osec) & SEC_EXCLUDE)
272 continue;
274 /* First find an input section so we have flags to compare with; the
275 flags in the output section are not valid. */
276 {
277 LANG_FOR_EACH_INPUT_STATEMENT (f)
278 {
279 asection *isec;
281 for (isec = f->the_bfd->sections;
282 isec != NULL;
283 isec = isec->next)
284 {
285 if (isec->output_section == osec
286 && isec->size != 0
287 && (bfd_get_section_flags (isec->owner, isec)
288 & SEC_EXCLUDE) == 0)
289 {
290 oflags_isa
291 = (elf_section_data (isec)->this_hdr.sh_flags
292 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
293 goto break_1;
294 }
295 }
296 }
297 }
299 break_1:
301 /* Check that all input sections have the same contents-type flags
302 as the first input section. */
303 {
304 LANG_FOR_EACH_INPUT_STATEMENT (f)
305 {
306 asection *isec;
308 for (isec = f->the_bfd->sections;
309 isec != NULL;
310 isec = isec->next)
311 {
312 if (isec->output_section == osec
313 && isec->size != 0
314 && (bfd_get_section_flags (isec->owner, isec)
315 & SEC_EXCLUDE) == 0)
316 {
317 bfd_vma iflags_isa
318 = (elf_section_data (isec)->this_hdr.sh_flags
319 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
321 /* If flags don't agree, set the target-specific data
322 of the section to mark that this section needs to
323 be have .cranges section entries added. Don't
324 bother setting ELF section flags in output section;
325 they will be cleared later and will have to be
326 re-initialized before the linked file is written. */
327 if (iflags_isa != oflags_isa)
328 {
329 oflags_isa = SHF_SH5_ISA32_MIXED;
331 BFD_ASSERT (sh64_elf_section_data (osec)->sh64_info);
333 sh64_elf_section_data (osec)->sh64_info->contents_flags
334 = SHF_SH5_ISA32_MIXED;
335 need_check_cranges = TRUE;
336 goto break_2;
337 }
338 }
339 }
340 }
341 }
343 break_2:
345 /* If there were no new ranges for this output section, we don't
346 need to iterate over the input sections to check how many are
347 needed. */
348 if (! need_check_cranges)
349 continue;
351 /* If we found a section with differing contents type, we need more
352 ranges to mark the sections that are not mixed (and already have
353 .cranges descriptors). Calculate the maximum number of new
354 entries here. We may merge some of them, so that number is not
355 final; it can shrink. */
356 {
357 LANG_FOR_EACH_INPUT_STATEMENT (f)
358 {
359 asection *isec;
361 for (isec = f->the_bfd->sections;
362 isec != NULL;
363 isec = isec->next)
364 {
365 if (isec->output_section == osec
366 && isec->size != 0
367 && (bfd_get_section_flags (isec->owner, isec)
368 & SEC_EXCLUDE) == 0
369 && ((elf_section_data (isec)->this_hdr.sh_flags
370 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
371 != SHF_SH5_ISA32_MIXED))
372 new_cranges++;
373 }
374 }
375 }
376 }
378 /* ldemul_after_allocation may be called twice. First directly from
379 lang_process, and the second time when lang_process calls ldemul_finish,
380 which calls gld${EMULATION_NAME}_finish, e.g. gldshelf32_finish, which
381 is defined in emultempl/elf32.em and calls ldemul_after_allocation,
382 if bfd_elf_discard_info returned true. */
383 if (cranges->contents != NULL)
384 free (cranges->contents);
386 BFD_ASSERT (sh64_elf_section_data (cranges)->sh64_info != NULL);
388 /* Make sure we have .cranges in memory even if there were only
389 assembler-generated .cranges. */
390 cranges_growth = new_cranges * SH64_CRANGE_SIZE;
391 cranges->contents = xcalloc (cranges->size + cranges_growth, 1);
392 bfd_set_section_flags (cranges->owner, cranges,
393 bfd_get_section_flags (cranges->owner, cranges)
394 | SEC_IN_MEMORY);
396 /* If we don't need to grow the .cranges section beyond what was in the
397 input sections, we have nothing more to do here. We then only got
398 here because there was a .cranges section coming from input. Zero
399 out the number of generated .cranges. */
400 if (new_cranges == 0)
401 {
402 sh64_elf_section_data (cranges)->sh64_info->cranges_growth = 0;
403 return;
404 }
406 crangesp = cranges->contents + cranges->size;
408 /* Now pass over the sections again, and make reloc orders for the new
409 .cranges entries. Constants are set as we go. */
410 for (osec = output_bfd->sections;
411 osec != NULL;
412 osec = osec->next)
413 {
414 struct bfd_link_order *cr_addr_order = NULL;
415 enum sh64_elf_cr_type last_cr_type = CRT_NONE;
416 bfd_vma last_cr_size = 0;
417 bfd_vma continuation_vma = 0;
419 /* Omit excluded or garbage-collected sections, and output sections
420 which were not marked as needing further processing. */
421 if ((bfd_get_section_flags (output_bfd, osec) & SEC_EXCLUDE) != 0
422 || (sh64_elf_section_data (osec)->sh64_info->contents_flags
423 != SHF_SH5_ISA32_MIXED))
424 continue;
426 {
427 LANG_FOR_EACH_INPUT_STATEMENT (f)
428 {
429 asection *isec;
431 for (isec = f->the_bfd->sections;
432 isec != NULL;
433 isec = isec->next)
434 {
435 /* Allow only sections that have (at least initially) a
436 non-zero size, and are not excluded, and are not marked
437 as containing mixed data, thus already having .cranges
438 entries. */
439 if (isec->output_section == osec
440 && isec->size != 0
441 && (bfd_get_section_flags (isec->owner, isec)
442 & SEC_EXCLUDE) == 0
443 && ((elf_section_data (isec)->this_hdr.sh_flags
444 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
445 != SHF_SH5_ISA32_MIXED))
446 {
447 enum sh64_elf_cr_type cr_type;
448 bfd_vma cr_size;
449 bfd_vma isa_flags
450 = (elf_section_data (isec)->this_hdr.sh_flags
451 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
453 if (isa_flags == SHF_SH5_ISA32)
454 cr_type = CRT_SH5_ISA32;
455 else if ((bfd_get_section_flags (isec->owner, isec)
456 & SEC_CODE) == 0)
457 cr_type = CRT_DATA;
458 else
459 cr_type = CRT_SH5_ISA16;
461 cr_size = isec->size;
463 /* Sections can be empty, like .text in a file that
464 only contains other sections. Ranges shouldn't be
465 emitted for them. This can presumably happen after
466 relaxing and is not be caught at the "raw size"
467 test above. */
468 if (cr_size == 0)
469 continue;
471 /* See if this is a continuation of the previous range
472 for the same output section. If so, just change
473 the size of the last range and continue. */
474 if (cr_type == last_cr_type
475 && (continuation_vma
476 == osec->vma + isec->output_offset))
477 {
478 last_cr_size += cr_size;
479 bfd_put_32 (output_bfd, last_cr_size,
480 crangesp - SH64_CRANGE_SIZE
481 + SH64_CRANGE_CR_SIZE_OFFSET);
483 continuation_vma += cr_size;
484 continue;
485 }
487 /* If we emit relocatable contents, we need a
488 relocation for the start address. */
489 if (link_info.relocatable || link_info.emitrelocations)
490 {
491 /* FIXME: We could perhaps use lang_add_reloc and
492 friends here, but I'm not really sure that
493 would leave us free to do some optimizations
494 later. */
495 cr_addr_order
496 = bfd_new_link_order (output_bfd, cranges);
498 if (cr_addr_order == NULL)
499 {
500 einfo (_("%P%F: bfd_new_link_order failed\n"));
501 return;
502 }
504 cr_addr_order->type = bfd_section_reloc_link_order;
505 cr_addr_order->offset
506 = (cranges->output_offset
507 + crangesp + SH64_CRANGE_CR_ADDR_OFFSET
508 - cranges->contents);
509 cr_addr_order->size = 4;
510 cr_addr_order->u.reloc.p
511 = xmalloc (sizeof (struct bfd_link_order_reloc));
513 cr_addr_order->u.reloc.p->reloc = BFD_RELOC_32;
514 cr_addr_order->u.reloc.p->u.section = osec;
516 /* Since SH, unlike normal RELA-targets, uses a
517 "partial inplace" REL-like relocation for this,
518 we put the addend in the contents and specify 0
519 for the reloc. */
520 bfd_put_32 (output_bfd, isec->output_offset,
521 crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
522 cr_addr_order->u.reloc.p->addend = 0;
524 /* We must update the number of relocations here,
525 since the elf linker does not take link orders
526 into account when setting header sizes. The
527 actual relocation orders are however executed
528 correctly. */
529 elf_section_data(cranges)->rel_count++;
530 }
531 else
532 bfd_put_32 (output_bfd,
533 osec->vma + isec->output_offset,
534 crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
536 /* If we could make a reloc for cr_size we would do
537 it, but we would have to have a symbol for the size
538 of the _input_ section and there's no way to
539 generate that. */
540 bfd_put_32 (output_bfd, cr_size,
541 crangesp + SH64_CRANGE_CR_SIZE_OFFSET);
543 bfd_put_16 (output_bfd, cr_type,
544 crangesp + SH64_CRANGE_CR_TYPE_OFFSET);
546 last_cr_type = cr_type;
547 last_cr_size = cr_size;
548 continuation_vma
549 = osec->vma + isec->output_offset + cr_size;
550 crangesp += SH64_CRANGE_SIZE;
551 }
552 }
553 }
554 }
555 }
557 /* The .cranges section will have this size, no larger or smaller.
558 Since relocs (if relocatable linking) will be emitted into the
559 "extended" size, we must set the raw size to the total. We have to
560 keep track of the number of new .cranges entries.
562 Sorting before writing is done by sh64_elf_final_write_processing. */
564 sh64_elf_section_data (cranges)->sh64_info->cranges_growth
565 = crangesp - cranges->contents - cranges->size;
566 cranges->size = crangesp - cranges->contents;
567 }