1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 2000-2014 Free Software Foundation, Inc.
4 # This file is part of the GNU Binutils.
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 3 of the License, or
9 # (at your option) any later version.
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.
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., 51 Franklin Street - Fifth Floor, Boston,
22 # This file is sourced from elf32.em, and defines extra sh64
26 LDEMUL_AFTER_ALLOCATION=sh64_elf_${EMULATION_NAME}_after_allocation
27 LDEMUL_BEFORE_ALLOCATION=sh64_elf_${EMULATION_NAME}_before_allocation
31 #include "libiberty.h"
35 #include "elf32-sh64.h"
37 /* Check if we need a .cranges section and create it if it's not in any
38 input file. It might seem better to always create it and if unneeded,
39 discard it, but I don't find a simple way to discard it totally from
42 Putting it here instead of as a elf_backend_always_size_sections hook
43 in elf32-sh64.c, means that we have access to linker command line
44 options here, and we can access input sections in the order in which
45 they will be linked. */
48 sh64_elf_${EMULATION_NAME}_before_allocation (void)
53 /* Call main function; we're just extending it. */
54 gld${EMULATION_NAME}_before_allocation ();
56 cranges = bfd_get_section_by_name (link_info.output_bfd,
57 SH64_CRANGES_SECTION_NAME);
61 if (RELAXATION_ENABLED)
63 /* FIXME: Look through incoming sections with .cranges
64 descriptors, build up some kind of descriptors that the
65 relaxing function will pick up and adjust, or perhaps make it
66 find and adjust an associated .cranges descriptor. We could
67 also look through incoming relocs and kill the ones marking
68 relaxation areas, but that wouldn't be TRT. */
70 (_("%P: Sorry, turning off relaxing: .cranges section in input.\n"));
71 einfo (_(" A .cranges section is present in:\n"));
74 LANG_FOR_EACH_INPUT_STATEMENT (f)
76 asection *input_cranges
77 = bfd_get_section_by_name (f->the_bfd,
78 SH64_CRANGES_SECTION_NAME);
79 if (input_cranges != NULL)
87 /* We wouldn't need to do anything when there's already a .cranges
88 section (and have a return here), except that we need to set the
89 section flags right for output sections that *don't* need a
93 if (RELAXATION_ENABLED)
95 LANG_FOR_EACH_INPUT_STATEMENT (f)
97 if (bfd_get_flavour (f->the_bfd) == bfd_target_elf_flavour)
101 for (isec = f->the_bfd->sections;
105 if (elf_section_data (isec)->this_hdr.sh_flags
106 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
108 einfo (_("%P: Sorry, turning off relaxing: SHmedia sections present.\n"));
111 goto done_scanning_shmedia_sections;
117 done_scanning_shmedia_sections:
119 /* For each non-empty input section in each output section, check if it
120 has the same SH64-specific flags. If some input section differs, we
121 need a .cranges section. */
122 for (osec = link_info.output_bfd->sections;
126 struct sh64_section_data *sh64_sec_data;
127 bfd_vma oflags_isa = 0;
128 bfd_vma iflags_isa = 0;
130 if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour)
131 einfo (_("%FError: non-ELF output formats are not supported by this target's linker.\n"));
133 sh64_sec_data = sh64_elf_section_data (osec)->sh64_info;
135 /* Omit excluded or garbage-collected sections. */
136 if (bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE)
139 /* Make sure we have the target section data initialized. */
140 if (sh64_sec_data == NULL)
142 sh64_sec_data = xcalloc (1, sizeof (struct sh64_section_data));
143 sh64_elf_section_data (osec)->sh64_info = sh64_sec_data;
146 /* First find an input section so we have flags to compare with; the
147 flags in the output section are not valid. */
149 LANG_FOR_EACH_INPUT_STATEMENT (f)
153 for (isec = f->the_bfd->sections;
157 if (isec->output_section == osec
159 && (bfd_get_section_flags (isec->owner, isec)
163 = (elf_section_data (isec)->this_hdr.sh_flags
164 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
173 /* Check that all input sections have the same contents-type flags
174 as the first input section. */
176 LANG_FOR_EACH_INPUT_STATEMENT (f)
180 for (isec = f->the_bfd->sections;
184 if (isec->output_section == osec
186 && (bfd_get_section_flags (isec->owner, isec)
190 = (elf_section_data (isec)->this_hdr.sh_flags
191 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
193 /* If flags don't agree, we need a .cranges section.
194 Create it here if it did not exist through input
196 if (iflags_isa != oflags_isa)
200 /* This section will be *appended* to
201 sections, so the outer iteration will reach
202 it in due time and set
203 sh64_elf_section_data; no need to set it
204 specifically here. */
206 = bfd_make_section_with_flags (link_info.output_bfd,
207 SH64_CRANGES_SECTION_NAME,
214 (_("%P%E%F: Can't make .cranges section\n"));
217 /* We don't need to look at more input sections,
218 and we know this section will have mixed
227 /* If we got here, then all input sections in this output section
228 have the same contents flag. Put that where we expect to see
229 contents flags. We don't need to do this for sections that will
230 need additional, linker-generated .cranges entries. */
231 sh64_sec_data->contents_flags = iflags_isa;
238 /* Size up and extend the .cranges section, merging generated entries. */
241 sh64_elf_${EMULATION_NAME}_after_allocation (void)
243 bfd_vma new_cranges = 0;
244 bfd_vma cranges_growth = 0;
249 gld${EMULATION_NAME}_after_allocation ();
251 cranges = bfd_get_section_by_name (link_info.output_bfd,
252 SH64_CRANGES_SECTION_NAME);
254 /* If there is no .cranges section, it is because it was seen earlier on
255 that none was needed. Otherwise it must have been created then, or
256 be present in input. */
260 /* First, we set the ISA flags for each output section according to the
261 first non-discarded section. For each input section in osec, we
262 check if it has the same flags. If it does not, we set flags to mark
263 a mixed section (and exit the loop early). */
264 for (osec = link_info.output_bfd->sections;
268 bfd_vma oflags_isa = 0;
269 bfd_boolean need_check_cranges = FALSE;
271 /* Omit excluded or garbage-collected sections. */
272 if (bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE)
275 /* First find an input section so we have flags to compare with; the
276 flags in the output section are not valid. */
278 LANG_FOR_EACH_INPUT_STATEMENT (f)
282 for (isec = f->the_bfd->sections;
286 if (isec->output_section == osec
288 && (bfd_get_section_flags (isec->owner, isec)
292 = (elf_section_data (isec)->this_hdr.sh_flags
293 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
302 /* Check that all input sections have the same contents-type flags
303 as the first input section. */
305 LANG_FOR_EACH_INPUT_STATEMENT (f)
309 for (isec = f->the_bfd->sections;
313 if (isec->output_section == osec
315 && (bfd_get_section_flags (isec->owner, isec)
319 = (elf_section_data (isec)->this_hdr.sh_flags
320 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
322 /* If flags don't agree, set the target-specific data
323 of the section to mark that this section needs to
324 be have .cranges section entries added. Don't
325 bother setting ELF section flags in output section;
326 they will be cleared later and will have to be
327 re-initialized before the linked file is written. */
328 if (iflags_isa != oflags_isa)
330 oflags_isa = SHF_SH5_ISA32_MIXED;
332 BFD_ASSERT (sh64_elf_section_data (osec)->sh64_info);
334 sh64_elf_section_data (osec)->sh64_info->contents_flags
335 = SHF_SH5_ISA32_MIXED;
336 need_check_cranges = TRUE;
346 /* If there were no new ranges for this output section, we don't
347 need to iterate over the input sections to check how many are
349 if (! need_check_cranges)
352 /* If we found a section with differing contents type, we need more
353 ranges to mark the sections that are not mixed (and already have
354 .cranges descriptors). Calculate the maximum number of new
355 entries here. We may merge some of them, so that number is not
356 final; it can shrink. */
358 LANG_FOR_EACH_INPUT_STATEMENT (f)
362 for (isec = f->the_bfd->sections;
366 if (isec->output_section == osec
368 && (bfd_get_section_flags (isec->owner, isec)
370 && ((elf_section_data (isec)->this_hdr.sh_flags
371 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
372 != SHF_SH5_ISA32_MIXED))
379 if (cranges->contents != NULL)
380 free (cranges->contents);
382 BFD_ASSERT (sh64_elf_section_data (cranges)->sh64_info != NULL);
384 /* Make sure we have .cranges in memory even if there were only
385 assembler-generated .cranges. */
386 cranges_growth = new_cranges * SH64_CRANGE_SIZE;
387 cranges->contents = xcalloc (cranges->size + cranges_growth, 1);
388 bfd_set_section_flags (cranges->owner, cranges,
389 bfd_get_section_flags (cranges->owner, cranges)
392 /* If we don't need to grow the .cranges section beyond what was in the
393 input sections, we have nothing more to do here. We then only got
394 here because there was a .cranges section coming from input. Zero
395 out the number of generated .cranges. */
396 if (new_cranges == 0)
398 sh64_elf_section_data (cranges)->sh64_info->cranges_growth = 0;
402 crangesp = cranges->contents + cranges->size;
404 /* Now pass over the sections again, and make reloc orders for the new
405 .cranges entries. Constants are set as we go. */
406 for (osec = link_info.output_bfd->sections;
410 struct bfd_link_order *cr_addr_order = NULL;
411 enum sh64_elf_cr_type last_cr_type = CRT_NONE;
412 bfd_vma last_cr_size = 0;
413 bfd_vma continuation_vma = 0;
415 /* Omit excluded or garbage-collected sections, and output sections
416 which were not marked as needing further processing. */
417 if ((bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE) != 0
418 || (sh64_elf_section_data (osec)->sh64_info->contents_flags
419 != SHF_SH5_ISA32_MIXED))
423 LANG_FOR_EACH_INPUT_STATEMENT (f)
427 for (isec = f->the_bfd->sections;
431 /* Allow only sections that have (at least initially) a
432 non-zero size, and are not excluded, and are not marked
433 as containing mixed data, thus already having .cranges
435 if (isec->output_section == osec
437 && (bfd_get_section_flags (isec->owner, isec)
439 && ((elf_section_data (isec)->this_hdr.sh_flags
440 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
441 != SHF_SH5_ISA32_MIXED))
443 enum sh64_elf_cr_type cr_type;
446 = (elf_section_data (isec)->this_hdr.sh_flags
447 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
449 if (isa_flags == SHF_SH5_ISA32)
450 cr_type = CRT_SH5_ISA32;
451 else if ((bfd_get_section_flags (isec->owner, isec)
455 cr_type = CRT_SH5_ISA16;
457 cr_size = isec->size;
459 /* Sections can be empty, like .text in a file that
460 only contains other sections. Ranges shouldn't be
461 emitted for them. This can presumably happen after
462 relaxing and is not be caught at the "raw size"
467 /* See if this is a continuation of the previous range
468 for the same output section. If so, just change
469 the size of the last range and continue. */
470 if (cr_type == last_cr_type
472 == osec->vma + isec->output_offset))
474 last_cr_size += cr_size;
475 bfd_put_32 (link_info.output_bfd, last_cr_size,
476 crangesp - SH64_CRANGE_SIZE
477 + SH64_CRANGE_CR_SIZE_OFFSET);
479 continuation_vma += cr_size;
483 /* If we emit relocatable contents, we need a
484 relocation for the start address. */
485 if (link_info.relocatable || link_info.emitrelocations)
487 /* FIXME: We could perhaps use lang_add_reloc and
488 friends here, but I'm not really sure that
489 would leave us free to do some optimizations
492 = bfd_new_link_order (link_info.output_bfd, cranges);
494 if (cr_addr_order == NULL)
496 einfo (_("%P%F: bfd_new_link_order failed\n"));
500 cr_addr_order->type = bfd_section_reloc_link_order;
501 cr_addr_order->offset
502 = (cranges->output_offset
503 + crangesp + SH64_CRANGE_CR_ADDR_OFFSET
504 - cranges->contents);
505 cr_addr_order->size = 4;
506 cr_addr_order->u.reloc.p
507 = xmalloc (sizeof (struct bfd_link_order_reloc));
509 cr_addr_order->u.reloc.p->reloc = BFD_RELOC_32;
510 cr_addr_order->u.reloc.p->u.section = osec;
512 /* Since SH, unlike normal RELA-targets, uses a
513 "partial inplace" REL-like relocation for this,
514 we put the addend in the contents and specify 0
516 bfd_put_32 (link_info.output_bfd, isec->output_offset,
517 crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
518 cr_addr_order->u.reloc.p->addend = 0;
521 bfd_put_32 (link_info.output_bfd,
522 osec->vma + isec->output_offset,
523 crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
525 /* If we could make a reloc for cr_size we would do
526 it, but we would have to have a symbol for the size
527 of the _input_ section and there's no way to
529 bfd_put_32 (link_info.output_bfd, cr_size,
530 crangesp + SH64_CRANGE_CR_SIZE_OFFSET);
532 bfd_put_16 (link_info.output_bfd, cr_type,
533 crangesp + SH64_CRANGE_CR_TYPE_OFFSET);
535 last_cr_type = cr_type;
536 last_cr_size = cr_size;
538 = osec->vma + isec->output_offset + cr_size;
539 crangesp += SH64_CRANGE_SIZE;
546 /* The .cranges section will have this size, no larger or smaller.
547 Since relocs (if relocatable linking) will be emitted into the
548 "extended" size, we must set the raw size to the total. We have to
549 keep track of the number of new .cranges entries.
551 Sorting before writing is done by sh64_elf_final_write_processing. */
553 sh64_elf_section_data (cranges)->sh64_info->cranges_growth
554 = crangesp - cranges->contents - cranges->size;
555 cranges->size = crangesp - cranges->contents;
556 cranges->rawsize = cranges->size;