1 # This shell script emits a C file. -*- C -*-
2 # Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
3 # Free Software Foundation, Inc.
5 # This file is part of the GNU Binutils.
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
23 # This file is sourced from elf32.em, and defines extra sh64
27 LDEMUL_AFTER_ALLOCATION=sh64_elf_${EMULATION_NAME}_after_allocation
28 LDEMUL_BEFORE_ALLOCATION=sh64_elf_${EMULATION_NAME}_before_allocation
32 #include "libiberty.h"
36 #include "elf32-sh64.h"
38 /* Check if we need a .cranges section and create it if it's not in any
39 input file. It might seem better to always create it and if unneeded,
40 discard it, but I don't find a simple way to discard it totally from
43 Putting it here instead of as a elf_backend_always_size_sections hook
44 in elf32-sh64.c, means that we have access to linker command line
45 options here, and we can access input sections in the order in which
46 they will be linked. */
49 sh64_elf_${EMULATION_NAME}_before_allocation (void)
54 /* Call main function; we're just extending it. */
55 gld${EMULATION_NAME}_before_allocation ();
57 cranges = bfd_get_section_by_name (link_info.output_bfd,
58 SH64_CRANGES_SECTION_NAME);
62 if (RELAXATION_ENABLED)
64 /* FIXME: Look through incoming sections with .cranges
65 descriptors, build up some kind of descriptors that the
66 relaxing function will pick up and adjust, or perhaps make it
67 find and adjust an associated .cranges descriptor. We could
68 also look through incoming relocs and kill the ones marking
69 relaxation areas, but that wouldn't be TRT. */
71 (_("%P: Sorry, turning off relaxing: .cranges section in input.\n"));
72 einfo (_(" A .cranges section is present in:\n"));
75 LANG_FOR_EACH_INPUT_STATEMENT (f)
77 asection *input_cranges
78 = bfd_get_section_by_name (f->the_bfd,
79 SH64_CRANGES_SECTION_NAME);
80 if (input_cranges != NULL)
88 /* We wouldn't need to do anything when there's already a .cranges
89 section (and have a return here), except that we need to set the
90 section flags right for output sections that *don't* need a
94 if (RELAXATION_ENABLED)
96 LANG_FOR_EACH_INPUT_STATEMENT (f)
98 if (bfd_get_flavour (f->the_bfd) == bfd_target_elf_flavour)
102 for (isec = f->the_bfd->sections;
106 if (elf_section_data (isec)->this_hdr.sh_flags
107 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
109 einfo (_("%P: Sorry, turning off relaxing: SHmedia sections present.\n"));
112 goto done_scanning_shmedia_sections;
118 done_scanning_shmedia_sections:
120 /* For each non-empty input section in each output section, check if it
121 has the same SH64-specific flags. If some input section differs, we
122 need a .cranges section. */
123 for (osec = link_info.output_bfd->sections;
127 struct sh64_section_data *sh64_sec_data;
128 bfd_vma oflags_isa = 0;
129 bfd_vma iflags_isa = 0;
131 if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour)
132 einfo (_("%FError: non-ELF output formats are not supported by this target's linker.\n"));
134 sh64_sec_data = sh64_elf_section_data (osec)->sh64_info;
136 /* Omit excluded or garbage-collected sections. */
137 if (bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE)
140 /* Make sure we have the target section data initialized. */
141 if (sh64_sec_data == NULL)
143 sh64_sec_data = xcalloc (1, sizeof (struct sh64_section_data));
144 sh64_elf_section_data (osec)->sh64_info = sh64_sec_data;
147 /* First find an input section so we have flags to compare with; the
148 flags in the output section are not valid. */
150 LANG_FOR_EACH_INPUT_STATEMENT (f)
154 for (isec = f->the_bfd->sections;
158 if (isec->output_section == osec
160 && (bfd_get_section_flags (isec->owner, isec)
164 = (elf_section_data (isec)->this_hdr.sh_flags
165 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
174 /* Check that all input sections have the same contents-type flags
175 as the first input section. */
177 LANG_FOR_EACH_INPUT_STATEMENT (f)
181 for (isec = f->the_bfd->sections;
185 if (isec->output_section == osec
187 && (bfd_get_section_flags (isec->owner, isec)
191 = (elf_section_data (isec)->this_hdr.sh_flags
192 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
194 /* If flags don't agree, we need a .cranges section.
195 Create it here if it did not exist through input
197 if (iflags_isa != oflags_isa)
201 /* This section will be *appended* to
202 sections, so the outer iteration will reach
203 it in due time and set
204 sh64_elf_section_data; no need to set it
205 specifically here. */
207 = bfd_make_section_with_flags (link_info.output_bfd,
208 SH64_CRANGES_SECTION_NAME,
215 (_("%P%E%F: Can't make .cranges section\n"));
218 /* We don't need to look at more input sections,
219 and we know this section will have mixed
228 /* If we got here, then all input sections in this output section
229 have the same contents flag. Put that where we expect to see
230 contents flags. We don't need to do this for sections that will
231 need additional, linker-generated .cranges entries. */
232 sh64_sec_data->contents_flags = iflags_isa;
239 /* Size up and extend the .cranges section, merging generated entries. */
242 sh64_elf_${EMULATION_NAME}_after_allocation (void)
244 bfd_vma new_cranges = 0;
245 bfd_vma cranges_growth = 0;
250 gld${EMULATION_NAME}_after_allocation ();
252 cranges = bfd_get_section_by_name (link_info.output_bfd,
253 SH64_CRANGES_SECTION_NAME);
255 /* If there is no .cranges section, it is because it was seen earlier on
256 that none was needed. Otherwise it must have been created then, or
257 be present in input. */
261 /* First, we set the ISA flags for each output section according to the
262 first non-discarded section. For each input section in osec, we
263 check if it has the same flags. If it does not, we set flags to mark
264 a mixed section (and exit the loop early). */
265 for (osec = link_info.output_bfd->sections;
269 bfd_vma oflags_isa = 0;
270 bfd_boolean need_check_cranges = FALSE;
272 /* Omit excluded or garbage-collected sections. */
273 if (bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE)
276 /* First find an input section so we have flags to compare with; the
277 flags in the output section are not valid. */
279 LANG_FOR_EACH_INPUT_STATEMENT (f)
283 for (isec = f->the_bfd->sections;
287 if (isec->output_section == osec
289 && (bfd_get_section_flags (isec->owner, isec)
293 = (elf_section_data (isec)->this_hdr.sh_flags
294 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
303 /* Check that all input sections have the same contents-type flags
304 as the first input section. */
306 LANG_FOR_EACH_INPUT_STATEMENT (f)
310 for (isec = f->the_bfd->sections;
314 if (isec->output_section == osec
316 && (bfd_get_section_flags (isec->owner, isec)
320 = (elf_section_data (isec)->this_hdr.sh_flags
321 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
323 /* If flags don't agree, set the target-specific data
324 of the section to mark that this section needs to
325 be have .cranges section entries added. Don't
326 bother setting ELF section flags in output section;
327 they will be cleared later and will have to be
328 re-initialized before the linked file is written. */
329 if (iflags_isa != oflags_isa)
331 oflags_isa = SHF_SH5_ISA32_MIXED;
333 BFD_ASSERT (sh64_elf_section_data (osec)->sh64_info);
335 sh64_elf_section_data (osec)->sh64_info->contents_flags
336 = SHF_SH5_ISA32_MIXED;
337 need_check_cranges = TRUE;
347 /* If there were no new ranges for this output section, we don't
348 need to iterate over the input sections to check how many are
350 if (! need_check_cranges)
353 /* If we found a section with differing contents type, we need more
354 ranges to mark the sections that are not mixed (and already have
355 .cranges descriptors). Calculate the maximum number of new
356 entries here. We may merge some of them, so that number is not
357 final; it can shrink. */
359 LANG_FOR_EACH_INPUT_STATEMENT (f)
363 for (isec = f->the_bfd->sections;
367 if (isec->output_section == osec
369 && (bfd_get_section_flags (isec->owner, isec)
371 && ((elf_section_data (isec)->this_hdr.sh_flags
372 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
373 != SHF_SH5_ISA32_MIXED))
380 if (cranges->contents != NULL)
381 free (cranges->contents);
383 BFD_ASSERT (sh64_elf_section_data (cranges)->sh64_info != NULL);
385 /* Make sure we have .cranges in memory even if there were only
386 assembler-generated .cranges. */
387 cranges_growth = new_cranges * SH64_CRANGE_SIZE;
388 cranges->contents = xcalloc (cranges->size + cranges_growth, 1);
389 bfd_set_section_flags (cranges->owner, cranges,
390 bfd_get_section_flags (cranges->owner, cranges)
393 /* If we don't need to grow the .cranges section beyond what was in the
394 input sections, we have nothing more to do here. We then only got
395 here because there was a .cranges section coming from input. Zero
396 out the number of generated .cranges. */
397 if (new_cranges == 0)
399 sh64_elf_section_data (cranges)->sh64_info->cranges_growth = 0;
403 crangesp = cranges->contents + cranges->size;
405 /* Now pass over the sections again, and make reloc orders for the new
406 .cranges entries. Constants are set as we go. */
407 for (osec = link_info.output_bfd->sections;
411 struct bfd_link_order *cr_addr_order = NULL;
412 enum sh64_elf_cr_type last_cr_type = CRT_NONE;
413 bfd_vma last_cr_size = 0;
414 bfd_vma continuation_vma = 0;
416 /* Omit excluded or garbage-collected sections, and output sections
417 which were not marked as needing further processing. */
418 if ((bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE) != 0
419 || (sh64_elf_section_data (osec)->sh64_info->contents_flags
420 != SHF_SH5_ISA32_MIXED))
424 LANG_FOR_EACH_INPUT_STATEMENT (f)
428 for (isec = f->the_bfd->sections;
432 /* Allow only sections that have (at least initially) a
433 non-zero size, and are not excluded, and are not marked
434 as containing mixed data, thus already having .cranges
436 if (isec->output_section == osec
438 && (bfd_get_section_flags (isec->owner, isec)
440 && ((elf_section_data (isec)->this_hdr.sh_flags
441 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
442 != SHF_SH5_ISA32_MIXED))
444 enum sh64_elf_cr_type cr_type;
447 = (elf_section_data (isec)->this_hdr.sh_flags
448 & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
450 if (isa_flags == SHF_SH5_ISA32)
451 cr_type = CRT_SH5_ISA32;
452 else if ((bfd_get_section_flags (isec->owner, isec)
456 cr_type = CRT_SH5_ISA16;
458 cr_size = isec->size;
460 /* Sections can be empty, like .text in a file that
461 only contains other sections. Ranges shouldn't be
462 emitted for them. This can presumably happen after
463 relaxing and is not be caught at the "raw size"
468 /* See if this is a continuation of the previous range
469 for the same output section. If so, just change
470 the size of the last range and continue. */
471 if (cr_type == last_cr_type
473 == osec->vma + isec->output_offset))
475 last_cr_size += cr_size;
476 bfd_put_32 (link_info.output_bfd, last_cr_size,
477 crangesp - SH64_CRANGE_SIZE
478 + SH64_CRANGE_CR_SIZE_OFFSET);
480 continuation_vma += cr_size;
484 /* If we emit relocatable contents, we need a
485 relocation for the start address. */
486 if (link_info.relocatable || link_info.emitrelocations)
488 /* FIXME: We could perhaps use lang_add_reloc and
489 friends here, but I'm not really sure that
490 would leave us free to do some optimizations
493 = bfd_new_link_order (link_info.output_bfd, cranges);
495 if (cr_addr_order == NULL)
497 einfo (_("%P%F: bfd_new_link_order failed\n"));
501 cr_addr_order->type = bfd_section_reloc_link_order;
502 cr_addr_order->offset
503 = (cranges->output_offset
504 + crangesp + SH64_CRANGE_CR_ADDR_OFFSET
505 - cranges->contents);
506 cr_addr_order->size = 4;
507 cr_addr_order->u.reloc.p
508 = xmalloc (sizeof (struct bfd_link_order_reloc));
510 cr_addr_order->u.reloc.p->reloc = BFD_RELOC_32;
511 cr_addr_order->u.reloc.p->u.section = osec;
513 /* Since SH, unlike normal RELA-targets, uses a
514 "partial inplace" REL-like relocation for this,
515 we put the addend in the contents and specify 0
517 bfd_put_32 (link_info.output_bfd, isec->output_offset,
518 crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
519 cr_addr_order->u.reloc.p->addend = 0;
522 bfd_put_32 (link_info.output_bfd,
523 osec->vma + isec->output_offset,
524 crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
526 /* If we could make a reloc for cr_size we would do
527 it, but we would have to have a symbol for the size
528 of the _input_ section and there's no way to
530 bfd_put_32 (link_info.output_bfd, cr_size,
531 crangesp + SH64_CRANGE_CR_SIZE_OFFSET);
533 bfd_put_16 (link_info.output_bfd, cr_type,
534 crangesp + SH64_CRANGE_CR_TYPE_OFFSET);
536 last_cr_type = cr_type;
537 last_cr_size = cr_size;
539 = osec->vma + isec->output_offset + cr_size;
540 crangesp += SH64_CRANGE_SIZE;
547 /* The .cranges section will have this size, no larger or smaller.
548 Since relocs (if relocatable linking) will be emitted into the
549 "extended" size, we must set the raw size to the total. We have to
550 keep track of the number of new .cranges entries.
552 Sorting before writing is done by sh64_elf_final_write_processing. */
554 sh64_elf_section_data (cranges)->sh64_info->cranges_growth
555 = crangesp - cranges->contents - cranges->size;
556 cranges->size = crangesp - cranges->contents;
557 cranges->rawsize = cranges->size;