1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 2000-2017 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"
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
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. */
47 sh64_elf_${EMULATION_NAME}_before_allocation (void)
52 /* Call main function; we're just extending it. */
53 gld${EMULATION_NAME}_before_allocation ();
55 cranges = bfd_get_section_by_name (link_info.output_bfd,
56 SH64_CRANGES_SECTION_NAME);
60 if (RELAXATION_ENABLED)
62 /* FIXME: Look through incoming sections with .cranges
63 descriptors, build up some kind of descriptors that the
64 relaxing function will pick up and adjust, or perhaps make it
65 find and adjust an associated .cranges descriptor. We could
66 also look through incoming relocs and kill the ones marking
67 relaxation areas, but that wouldn't be TRT. */
69 (_("%P: Sorry, turning off relaxing: .cranges section in input.\n"));
70 einfo (_(" A .cranges section is present in:\n"));
73 LANG_FOR_EACH_INPUT_STATEMENT (f)
75 asection *input_cranges
76 = bfd_get_section_by_name (f->the_bfd,
77 SH64_CRANGES_SECTION_NAME);
78 if (input_cranges != NULL)
86 /* We wouldn't need to do anything when there's already a .cranges
87 section (and have a return here), except that we need to set the
88 section flags right for output sections that *don't* need a
92 if (RELAXATION_ENABLED)
94 LANG_FOR_EACH_INPUT_STATEMENT (f)
96 if (bfd_get_flavour (f->the_bfd) == bfd_target_elf_flavour)
100 for (isec = f->the_bfd->sections;
104 if (elf_section_data (isec)->this_hdr.sh_flags
105 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
107 einfo (_("%P: Sorry, turning off relaxing: SHmedia sections present.\n"));
110 goto done_scanning_shmedia_sections;
116 done_scanning_shmedia_sections:
118 /* For each non-empty input section in each output section, check if it
119 has the same SH64-specific flags. If some input section differs, we
120 need a .cranges section. */
121 for (osec = link_info.output_bfd->sections;
125 struct sh64_section_data *sh64_sec_data;
126 bfd_vma oflags_isa = 0;
127 bfd_vma iflags_isa = 0;
129 if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour)
130 einfo (_("%FError: non-ELF output formats are not supported by this target's linker.\n"));
132 sh64_sec_data = sh64_elf_section_data (osec)->sh64_info;
134 /* Omit excluded or garbage-collected sections. */
135 if (bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE)
138 /* Make sure we have the target section data initialized. */
139 if (sh64_sec_data == NULL)
141 sh64_sec_data = xcalloc (1, sizeof (struct sh64_section_data));
142 sh64_elf_section_data (osec)->sh64_info = sh64_sec_data;
145 /* First find an input section so we have flags to compare with; the
146 flags in the output section are not valid. */
148 LANG_FOR_EACH_INPUT_STATEMENT (f)
152 for (isec = f->the_bfd->sections;
156 if (isec->output_section == osec
158 && (bfd_get_section_flags (isec->owner, isec)
162 = (elf_section_data (isec)->this_hdr.sh_flags
163 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
172 /* Check that all input sections have the same contents-type flags
173 as the first input section. */
175 LANG_FOR_EACH_INPUT_STATEMENT (f)
179 for (isec = f->the_bfd->sections;
183 if (isec->output_section == osec
185 && (bfd_get_section_flags (isec->owner, isec)
189 = (elf_section_data (isec)->this_hdr.sh_flags
190 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
192 /* If flags don't agree, we need a .cranges section.
193 Create it here if it did not exist through input
195 if (iflags_isa != oflags_isa)
199 /* This section will be *appended* to
200 sections, so the outer iteration will reach
201 it in due time and set
202 sh64_elf_section_data; no need to set it
203 specifically here. */
205 = bfd_make_section_with_flags (link_info.output_bfd,
206 SH64_CRANGES_SECTION_NAME,
213 (_("%P%E%F: Can't make .cranges section\n"));
216 /* We don't need to look at more input sections,
217 and we know this section will have mixed
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;
237 /* Size up and extend the .cranges section, merging generated entries. */
240 sh64_elf_${EMULATION_NAME}_after_allocation (void)
242 bfd_vma new_cranges = 0;
243 bfd_vma cranges_growth = 0;
248 gld${EMULATION_NAME}_after_allocation ();
250 /* Needed, since we create link_orders here. */
251 lang_clear_os_map ();
253 cranges = bfd_get_section_by_name (link_info.output_bfd,
254 SH64_CRANGES_SECTION_NAME);
256 /* If there is no .cranges section, it is because it was seen earlier on
257 that none was needed. Otherwise it must have been created then, or
258 be present in input. */
262 /* First, we set the ISA flags for each output section according to the
263 first non-discarded section. For each input section in osec, we
264 check if it has the same flags. If it does not, we set flags to mark
265 a mixed section (and exit the loop early). */
266 for (osec = link_info.output_bfd->sections;
270 bfd_vma oflags_isa = 0;
271 bfd_boolean need_check_cranges = FALSE;
273 /* Omit excluded or garbage-collected sections. */
274 if (bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE)
277 /* First find an input section so we have flags to compare with; the
278 flags in the output section are not valid. */
280 LANG_FOR_EACH_INPUT_STATEMENT (f)
284 for (isec = f->the_bfd->sections;
288 if (isec->output_section == osec
290 && (bfd_get_section_flags (isec->owner, isec)
294 = (elf_section_data (isec)->this_hdr.sh_flags
295 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
304 /* Check that all input sections have the same contents-type flags
305 as the first input section. */
307 LANG_FOR_EACH_INPUT_STATEMENT (f)
311 for (isec = f->the_bfd->sections;
315 if (isec->output_section == osec
317 && (bfd_get_section_flags (isec->owner, isec)
321 = (elf_section_data (isec)->this_hdr.sh_flags
322 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
324 /* If flags don't agree, set the target-specific data
325 of the section to mark that this section needs to
326 be have .cranges section entries added. Don't
327 bother setting ELF section flags in output section;
328 they will be cleared later and will have to be
329 re-initialized before the linked file is written. */
330 if (iflags_isa != oflags_isa)
332 oflags_isa = SHF_SH5_ISA32_MIXED;
334 ASSERT (sh64_elf_section_data (osec)->sh64_info);
336 sh64_elf_section_data (osec)->sh64_info->contents_flags
337 = SHF_SH5_ISA32_MIXED;
338 need_check_cranges = TRUE;
348 /* If there were no new ranges for this output section, we don't
349 need to iterate over the input sections to check how many are
351 if (! need_check_cranges)
354 /* If we found a section with differing contents type, we need more
355 ranges to mark the sections that are not mixed (and already have
356 .cranges descriptors). Calculate the maximum number of new
357 entries here. We may merge some of them, so that number is not
358 final; it can shrink. */
360 LANG_FOR_EACH_INPUT_STATEMENT (f)
364 for (isec = f->the_bfd->sections;
368 if (isec->output_section == osec
370 && (bfd_get_section_flags (isec->owner, isec)
372 && ((elf_section_data (isec)->this_hdr.sh_flags
373 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
374 != SHF_SH5_ISA32_MIXED))
381 if (cranges->contents != NULL)
382 free (cranges->contents);
384 ASSERT (sh64_elf_section_data (cranges)->sh64_info != NULL);
386 /* Make sure we have .cranges in memory even if there were only
387 assembler-generated .cranges. */
388 cranges_growth = new_cranges * SH64_CRANGE_SIZE;
389 cranges->contents = xcalloc (cranges->size + cranges_growth, 1);
390 bfd_set_section_flags (cranges->owner, cranges,
391 bfd_get_section_flags (cranges->owner, cranges)
394 /* If we don't need to grow the .cranges section beyond what was in the
395 input sections, we have nothing more to do here. We then only got
396 here because there was a .cranges section coming from input. Zero
397 out the number of generated .cranges. */
398 if (new_cranges == 0)
400 sh64_elf_section_data (cranges)->sh64_info->cranges_growth = 0;
404 crangesp = cranges->contents + cranges->size;
406 /* Now pass over the sections again, and make reloc orders for the new
407 .cranges entries. Constants are set as we go. */
408 for (osec = link_info.output_bfd->sections;
412 struct bfd_link_order *cr_addr_order = NULL;
413 enum sh64_elf_cr_type last_cr_type = CRT_NONE;
414 bfd_vma last_cr_size = 0;
415 bfd_vma continuation_vma = 0;
417 /* Omit excluded or garbage-collected sections, and output sections
418 which were not marked as needing further processing. */
419 if ((bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE) != 0
420 || (sh64_elf_section_data (osec)->sh64_info->contents_flags
421 != SHF_SH5_ISA32_MIXED))
425 LANG_FOR_EACH_INPUT_STATEMENT (f)
429 for (isec = f->the_bfd->sections;
433 /* Allow only sections that have (at least initially) a
434 non-zero size, and are not excluded, and are not marked
435 as containing mixed data, thus already having .cranges
437 if (isec->output_section == osec
439 && (bfd_get_section_flags (isec->owner, isec)
441 && ((elf_section_data (isec)->this_hdr.sh_flags
442 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
443 != SHF_SH5_ISA32_MIXED))
445 enum sh64_elf_cr_type cr_type;
448 = (elf_section_data (isec)->this_hdr.sh_flags
449 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
451 if (isa_flags == SHF_SH5_ISA32)
452 cr_type = CRT_SH5_ISA32;
453 else if ((bfd_get_section_flags (isec->owner, isec)
457 cr_type = CRT_SH5_ISA16;
459 cr_size = isec->size;
461 /* Sections can be empty, like .text in a file that
462 only contains other sections. Ranges shouldn't be
463 emitted for them. This can presumably happen after
464 relaxing and is not be caught at the "raw size"
469 /* See if this is a continuation of the previous range
470 for the same output section. If so, just change
471 the size of the last range and continue. */
472 if (cr_type == last_cr_type
474 == osec->vma + isec->output_offset))
476 last_cr_size += cr_size;
477 bfd_put_32 (link_info.output_bfd, last_cr_size,
478 crangesp - SH64_CRANGE_SIZE
479 + SH64_CRANGE_CR_SIZE_OFFSET);
481 continuation_vma += cr_size;
485 /* If we emit relocatable contents, we need a
486 relocation for the start address. */
487 if (bfd_link_relocatable (&link_info)
488 || link_info.emitrelocations)
490 /* FIXME: We could perhaps use lang_add_reloc and
491 friends here, but I'm not really sure that
492 would leave us free to do some optimizations
495 = bfd_new_link_order (link_info.output_bfd, cranges);
497 if (cr_addr_order == NULL)
499 einfo (_("%P%F: bfd_new_link_order failed\n"));
503 cr_addr_order->type = bfd_section_reloc_link_order;
504 cr_addr_order->offset
505 = (cranges->output_offset
506 + crangesp + SH64_CRANGE_CR_ADDR_OFFSET
507 - cranges->contents);
508 cr_addr_order->size = 4;
509 cr_addr_order->u.reloc.p
510 = xmalloc (sizeof (struct bfd_link_order_reloc));
512 cr_addr_order->u.reloc.p->reloc = BFD_RELOC_32;
513 cr_addr_order->u.reloc.p->u.section = osec;
515 /* Since SH, unlike normal RELA-targets, uses a
516 "partial inplace" REL-like relocation for this,
517 we put the addend in the contents and specify 0
519 bfd_put_32 (link_info.output_bfd, isec->output_offset,
520 crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
521 cr_addr_order->u.reloc.p->addend = 0;
524 bfd_put_32 (link_info.output_bfd,
525 osec->vma + isec->output_offset,
526 crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
528 /* If we could make a reloc for cr_size we would do
529 it, but we would have to have a symbol for the size
530 of the _input_ section and there's no way to
532 bfd_put_32 (link_info.output_bfd, cr_size,
533 crangesp + SH64_CRANGE_CR_SIZE_OFFSET);
535 bfd_put_16 (link_info.output_bfd, cr_type,
536 crangesp + SH64_CRANGE_CR_TYPE_OFFSET);
538 last_cr_type = cr_type;
539 last_cr_size = cr_size;
541 = osec->vma + isec->output_offset + cr_size;
542 crangesp += SH64_CRANGE_SIZE;
549 /* The .cranges section will have this size, no larger or smaller.
550 Since relocs (if relocatable linking) will be emitted into the
551 "extended" size, we must set the raw size to the total. We have to
552 keep track of the number of new .cranges entries.
554 Sorting before writing is done by sh64_elf_final_write_processing. */
556 sh64_elf_section_data (cranges)->sh64_info->cranges_growth
557 = crangesp - cranges->contents - cranges->size;
558 cranges->size = crangesp - cranges->contents;
559 cranges->rawsize = cranges->size;