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1/* MMIX-specific support for 64-bit ELF.
2 Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
3 Contributed by Hans-Peter Nilsson <hp@bitrange.com>
4
5This file is part of BFD, the Binary File Descriptor library.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21/* No specific ABI or "processor-specific supplement" defined. */
22
23/* TODO:
24 - "Traditional" linker relaxation (shrinking whole sections).
25 - Merge reloc stubs jumping to same location.
26 - GETA stub relaxation (call a stub for out of range new
27 R_MMIX_GETA_STUBBABLE). */
28
29#include "bfd.h"
30#include "sysdep.h"
31#include "libbfd.h"
32#include "elf-bfd.h"
33#include "elf/mmix.h"
34#include "opcode/mmix.h"
35
36#define MINUS_ONE (((bfd_vma) 0) - 1)
37
38#define MAX_PUSHJ_STUB_SIZE (5 * 4)
39
40/* Put these everywhere in new code. */
41#define FATAL_DEBUG \
42 _bfd_abort (__FILE__, __LINE__, \
43 "Internal: Non-debugged code (test-case missing)")
44
45#define BAD_CASE(x) \
46 _bfd_abort (__FILE__, __LINE__, \
47 "bad case for " #x)
48
49struct _mmix_elf_section_data
50{
51 struct bfd_elf_section_data elf;
52 union
53 {
54 struct bpo_reloc_section_info *reloc;
55 struct bpo_greg_section_info *greg;
56 } bpo;
57
58 struct pushj_stub_info
59 {
60 /* Maximum number of stubs needed for this section. */
61 bfd_size_type n_pushj_relocs;
62
63 /* Size of stubs after a mmix_elf_relax_section round. */
64 bfd_size_type stubs_size_sum;
65
66 /* Per-reloc stubs_size_sum information. The stubs_size_sum member is the sum
67 of these. Allocated in mmix_elf_check_common_relocs. */
68 bfd_size_type *stub_size;
69
70 /* Offset of next stub during relocation. Somewhat redundant with the
71 above: error coverage is easier and we don't have to reset the
72 stubs_size_sum for relocation. */
73 bfd_size_type stub_offset;
74 } pjs;
75};
76
77#define mmix_elf_section_data(sec) \
78 ((struct _mmix_elf_section_data *) elf_section_data (sec))
79
80/* For each section containing a base-plus-offset (BPO) reloc, we attach
81 this struct as mmix_elf_section_data (section)->bpo, which is otherwise
82 NULL. */
83struct bpo_reloc_section_info
84 {
85 /* The base is 1; this is the first number in this section. */
86 size_t first_base_plus_offset_reloc;
87
88 /* Number of BPO-relocs in this section. */
89 size_t n_bpo_relocs_this_section;
90
91 /* Running index, used at relocation time. */
92 size_t bpo_index;
93
94 /* We don't have access to the bfd_link_info struct in
95 mmix_final_link_relocate. What we really want to get at is the
96 global single struct greg_relocation, so we stash it here. */
97 asection *bpo_greg_section;
98 };
99
100/* Helper struct (in global context) for the one below.
101 There's one of these created for every BPO reloc. */
102struct bpo_reloc_request
103 {
104 bfd_vma value;
105
106 /* Valid after relaxation. The base is 0; the first register number
107 must be added. The offset is in range 0..255. */
108 size_t regindex;
109 size_t offset;
110
111 /* The order number for this BPO reloc, corresponding to the order in
112 which BPO relocs were found. Used to create an index after reloc
113 requests are sorted. */
114 size_t bpo_reloc_no;
115
116 /* Set when the value is computed. Better than coding "guard values"
117 into the other members. Is FALSE only for BPO relocs in a GC:ed
118 section. */
119 bfd_boolean valid;
120 };
121
122/* We attach this as mmix_elf_section_data (sec)->bpo in the linker-allocated
123 greg contents section (MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME),
124 which is linked into the register contents section
125 (MMIX_REG_CONTENTS_SECTION_NAME). This section is created by the
126 linker; using the same hook as for usual with BPO relocs does not
127 collide. */
128struct bpo_greg_section_info
129 {
130 /* After GC, this reflects the number of remaining, non-excluded
131 BPO-relocs. */
132 size_t n_bpo_relocs;
133
134 /* This is the number of allocated bpo_reloc_requests; the size of
135 sorted_indexes. Valid after the check.*relocs functions are called
136 for all incoming sections. It includes the number of BPO relocs in
137 sections that were GC:ed. */
138 size_t n_max_bpo_relocs;
139
140 /* A counter used to find out when to fold the BPO gregs, since we
141 don't have a single "after-relaxation" hook. */
142 size_t n_remaining_bpo_relocs_this_relaxation_round;
143
144 /* The number of linker-allocated GREGs resulting from BPO relocs.
145 This is an approximation after _bfd_mmix_before_linker_allocation
146 and supposedly accurate after mmix_elf_relax_section is called for
147 all incoming non-collected sections. */
148 size_t n_allocated_bpo_gregs;
149
150 /* Index into reloc_request[], sorted on increasing "value", secondary
151 by increasing index for strict sorting order. */
152 size_t *bpo_reloc_indexes;
153
154 /* An array of all relocations, with the "value" member filled in by
155 the relaxation function. */
156 struct bpo_reloc_request *reloc_request;
157 };
158
159static bfd_boolean mmix_elf_link_output_symbol_hook
160 PARAMS ((struct bfd_link_info *, const char *, Elf_Internal_Sym *,
161 asection *, struct elf_link_hash_entry *));
162
163static bfd_reloc_status_type mmix_elf_reloc
164 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
165
166static reloc_howto_type *bfd_elf64_bfd_reloc_type_lookup
167 PARAMS ((bfd *, bfd_reloc_code_real_type));
168
169static void mmix_info_to_howto_rela
170 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
171
172static int mmix_elf_sort_relocs PARAMS ((const PTR, const PTR));
173
174static bfd_boolean mmix_elf_new_section_hook
175 PARAMS ((bfd *, asection *));
176
177static bfd_boolean mmix_elf_check_relocs
178 PARAMS ((bfd *, struct bfd_link_info *, asection *,
179 const Elf_Internal_Rela *));
180
181static bfd_boolean mmix_elf_check_common_relocs
182 PARAMS ((bfd *, struct bfd_link_info *, asection *,
183 const Elf_Internal_Rela *));
184
185static bfd_boolean mmix_elf_relocate_section
186 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
187 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
188
189static asection * mmix_elf_gc_mark_hook
190 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
191 struct elf_link_hash_entry *, Elf_Internal_Sym *));
192
193static bfd_boolean mmix_elf_gc_sweep_hook
194 PARAMS ((bfd *, struct bfd_link_info *, asection *,
195 const Elf_Internal_Rela *));
196
197static bfd_reloc_status_type mmix_final_link_relocate
198 PARAMS ((reloc_howto_type *, asection *, bfd_byte *,
199 bfd_vma, bfd_signed_vma, bfd_vma, const char *, asection *));
200
201static bfd_reloc_status_type mmix_elf_perform_relocation
202 PARAMS ((asection *, reloc_howto_type *, PTR, bfd_vma, bfd_vma));
203
204static bfd_boolean mmix_elf_section_from_bfd_section
205 PARAMS ((bfd *, asection *, int *));
206
207static bfd_boolean mmix_elf_add_symbol_hook
208 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Sym *,
209 const char **, flagword *, asection **, bfd_vma *));
210
211static bfd_boolean mmix_elf_is_local_label_name
212 PARAMS ((bfd *, const char *));
213
214static int bpo_reloc_request_sort_fn PARAMS ((const PTR, const PTR));
215
216static bfd_boolean mmix_elf_relax_section
217 PARAMS ((bfd *abfd, asection *sec, struct bfd_link_info *link_info,
218 bfd_boolean *again));
219
220extern bfd_boolean mmix_elf_final_link PARAMS ((bfd *, struct bfd_link_info *));
221
222extern void mmix_elf_symbol_processing PARAMS ((bfd *, asymbol *));
223
224/* Only intended to be called from a debugger. */
225extern void mmix_dump_bpo_gregs
226 PARAMS ((struct bfd_link_info *, bfd_error_handler_type));
227
228static void
229mmix_set_relaxable_size
230 PARAMS ((bfd *, asection *, void *));
231
232static bfd_boolean
233mmix_elf_get_section_contents
234 PARAMS ((bfd *, sec_ptr, void *, file_ptr, bfd_size_type));
235
236
237/* Watch out: this currently needs to have elements with the same index as
238 their R_MMIX_ number. */
239static reloc_howto_type elf_mmix_howto_table[] =
240 {
241 /* This reloc does nothing. */
242 HOWTO (R_MMIX_NONE, /* type */
243 0, /* rightshift */
244 2, /* size (0 = byte, 1 = short, 2 = long) */
245 32, /* bitsize */
246 FALSE, /* pc_relative */
247 0, /* bitpos */
248 complain_overflow_bitfield, /* complain_on_overflow */
249 bfd_elf_generic_reloc, /* special_function */
250 "R_MMIX_NONE", /* name */
251 FALSE, /* partial_inplace */
252 0, /* src_mask */
253 0, /* dst_mask */
254 FALSE), /* pcrel_offset */
255
256 /* An 8 bit absolute relocation. */
257 HOWTO (R_MMIX_8, /* type */
258 0, /* rightshift */
259 0, /* size (0 = byte, 1 = short, 2 = long) */
260 8, /* bitsize */
261 FALSE, /* pc_relative */
262 0, /* bitpos */
263 complain_overflow_bitfield, /* complain_on_overflow */
264 bfd_elf_generic_reloc, /* special_function */
265 "R_MMIX_8", /* name */
266 FALSE, /* partial_inplace */
267 0, /* src_mask */
268 0xff, /* dst_mask */
269 FALSE), /* pcrel_offset */
270
271 /* An 16 bit absolute relocation. */
272 HOWTO (R_MMIX_16, /* type */
273 0, /* rightshift */
274 1, /* size (0 = byte, 1 = short, 2 = long) */
275 16, /* bitsize */
276 FALSE, /* pc_relative */
277 0, /* bitpos */
278 complain_overflow_bitfield, /* complain_on_overflow */
279 bfd_elf_generic_reloc, /* special_function */
280 "R_MMIX_16", /* name */
281 FALSE, /* partial_inplace */
282 0, /* src_mask */
283 0xffff, /* dst_mask */
284 FALSE), /* pcrel_offset */
285
286 /* An 24 bit absolute relocation. */
287 HOWTO (R_MMIX_24, /* type */
288 0, /* rightshift */
289 2, /* size (0 = byte, 1 = short, 2 = long) */
290 24, /* bitsize */
291 FALSE, /* pc_relative */
292 0, /* bitpos */
293 complain_overflow_bitfield, /* complain_on_overflow */
294 bfd_elf_generic_reloc, /* special_function */
295 "R_MMIX_24", /* name */
296 FALSE, /* partial_inplace */
297 ~0xffffff, /* src_mask */
298 0xffffff, /* dst_mask */
299 FALSE), /* pcrel_offset */
300
301 /* A 32 bit absolute relocation. */
302 HOWTO (R_MMIX_32, /* type */
303 0, /* rightshift */
304 2, /* size (0 = byte, 1 = short, 2 = long) */
305 32, /* bitsize */
306 FALSE, /* pc_relative */
307 0, /* bitpos */
308 complain_overflow_bitfield, /* complain_on_overflow */
309 bfd_elf_generic_reloc, /* special_function */
310 "R_MMIX_32", /* name */
311 FALSE, /* partial_inplace */
312 0, /* src_mask */
313 0xffffffff, /* dst_mask */
314 FALSE), /* pcrel_offset */
315
316 /* 64 bit relocation. */
317 HOWTO (R_MMIX_64, /* type */
318 0, /* rightshift */
319 4, /* size (0 = byte, 1 = short, 2 = long) */
320 64, /* bitsize */
321 FALSE, /* pc_relative */
322 0, /* bitpos */
323 complain_overflow_bitfield, /* complain_on_overflow */
324 bfd_elf_generic_reloc, /* special_function */
325 "R_MMIX_64", /* name */
326 FALSE, /* partial_inplace */
327 0, /* src_mask */
328 MINUS_ONE, /* dst_mask */
329 FALSE), /* pcrel_offset */
330
331 /* An 8 bit PC-relative relocation. */
332 HOWTO (R_MMIX_PC_8, /* type */
333 0, /* rightshift */
334 0, /* size (0 = byte, 1 = short, 2 = long) */
335 8, /* bitsize */
336 TRUE, /* pc_relative */
337 0, /* bitpos */
338 complain_overflow_bitfield, /* complain_on_overflow */
339 bfd_elf_generic_reloc, /* special_function */
340 "R_MMIX_PC_8", /* name */
341 FALSE, /* partial_inplace */
342 0, /* src_mask */
343 0xff, /* dst_mask */
344 TRUE), /* pcrel_offset */
345
346 /* An 16 bit PC-relative relocation. */
347 HOWTO (R_MMIX_PC_16, /* type */
348 0, /* rightshift */
349 1, /* size (0 = byte, 1 = short, 2 = long) */
350 16, /* bitsize */
351 TRUE, /* pc_relative */
352 0, /* bitpos */
353 complain_overflow_bitfield, /* complain_on_overflow */
354 bfd_elf_generic_reloc, /* special_function */
355 "R_MMIX_PC_16", /* name */
356 FALSE, /* partial_inplace */
357 0, /* src_mask */
358 0xffff, /* dst_mask */
359 TRUE), /* pcrel_offset */
360
361 /* An 24 bit PC-relative relocation. */
362 HOWTO (R_MMIX_PC_24, /* type */
363 0, /* rightshift */
364 2, /* size (0 = byte, 1 = short, 2 = long) */
365 24, /* bitsize */
366 TRUE, /* pc_relative */
367 0, /* bitpos */
368 complain_overflow_bitfield, /* complain_on_overflow */
369 bfd_elf_generic_reloc, /* special_function */
370 "R_MMIX_PC_24", /* name */
371 FALSE, /* partial_inplace */
372 ~0xffffff, /* src_mask */
373 0xffffff, /* dst_mask */
374 TRUE), /* pcrel_offset */
375
376 /* A 32 bit absolute PC-relative relocation. */
377 HOWTO (R_MMIX_PC_32, /* type */
378 0, /* rightshift */
379 2, /* size (0 = byte, 1 = short, 2 = long) */
380 32, /* bitsize */
381 TRUE, /* pc_relative */
382 0, /* bitpos */
383 complain_overflow_bitfield, /* complain_on_overflow */
384 bfd_elf_generic_reloc, /* special_function */
385 "R_MMIX_PC_32", /* name */
386 FALSE, /* partial_inplace */
387 0, /* src_mask */
388 0xffffffff, /* dst_mask */
389 TRUE), /* pcrel_offset */
390
391 /* 64 bit PC-relative relocation. */
392 HOWTO (R_MMIX_PC_64, /* type */
393 0, /* rightshift */
394 4, /* size (0 = byte, 1 = short, 2 = long) */
395 64, /* bitsize */
396 TRUE, /* pc_relative */
397 0, /* bitpos */
398 complain_overflow_bitfield, /* complain_on_overflow */
399 bfd_elf_generic_reloc, /* special_function */
400 "R_MMIX_PC_64", /* name */
401 FALSE, /* partial_inplace */
402 0, /* src_mask */
403 MINUS_ONE, /* dst_mask */
404 TRUE), /* pcrel_offset */
405
406 /* GNU extension to record C++ vtable hierarchy. */
407 HOWTO (R_MMIX_GNU_VTINHERIT, /* type */
408 0, /* rightshift */
409 0, /* size (0 = byte, 1 = short, 2 = long) */
410 0, /* bitsize */
411 FALSE, /* pc_relative */
412 0, /* bitpos */
413 complain_overflow_dont, /* complain_on_overflow */
414 NULL, /* special_function */
415 "R_MMIX_GNU_VTINHERIT", /* name */
416 FALSE, /* partial_inplace */
417 0, /* src_mask */
418 0, /* dst_mask */
419 TRUE), /* pcrel_offset */
420
421 /* GNU extension to record C++ vtable member usage. */
422 HOWTO (R_MMIX_GNU_VTENTRY, /* type */
423 0, /* rightshift */
424 0, /* size (0 = byte, 1 = short, 2 = long) */
425 0, /* bitsize */
426 FALSE, /* pc_relative */
427 0, /* bitpos */
428 complain_overflow_dont, /* complain_on_overflow */
429 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
430 "R_MMIX_GNU_VTENTRY", /* name */
431 FALSE, /* partial_inplace */
432 0, /* src_mask */
433 0, /* dst_mask */
434 FALSE), /* pcrel_offset */
435
436 /* The GETA relocation is supposed to get any address that could
437 possibly be reached by the GETA instruction. It can silently expand
438 to get a 64-bit operand, but will complain if any of the two least
439 significant bits are set. The howto members reflect a simple GETA. */
440 HOWTO (R_MMIX_GETA, /* type */
441 2, /* rightshift */
442 2, /* size (0 = byte, 1 = short, 2 = long) */
443 19, /* bitsize */
444 TRUE, /* pc_relative */
445 0, /* bitpos */
446 complain_overflow_signed, /* complain_on_overflow */
447 mmix_elf_reloc, /* special_function */
448 "R_MMIX_GETA", /* name */
449 FALSE, /* partial_inplace */
450 ~0x0100ffff, /* src_mask */
451 0x0100ffff, /* dst_mask */
452 TRUE), /* pcrel_offset */
453
454 HOWTO (R_MMIX_GETA_1, /* type */
455 2, /* rightshift */
456 2, /* size (0 = byte, 1 = short, 2 = long) */
457 19, /* bitsize */
458 TRUE, /* pc_relative */
459 0, /* bitpos */
460 complain_overflow_signed, /* complain_on_overflow */
461 mmix_elf_reloc, /* special_function */
462 "R_MMIX_GETA_1", /* name */
463 FALSE, /* partial_inplace */
464 ~0x0100ffff, /* src_mask */
465 0x0100ffff, /* dst_mask */
466 TRUE), /* pcrel_offset */
467
468 HOWTO (R_MMIX_GETA_2, /* type */
469 2, /* rightshift */
470 2, /* size (0 = byte, 1 = short, 2 = long) */
471 19, /* bitsize */
472 TRUE, /* pc_relative */
473 0, /* bitpos */
474 complain_overflow_signed, /* complain_on_overflow */
475 mmix_elf_reloc, /* special_function */
476 "R_MMIX_GETA_2", /* name */
477 FALSE, /* partial_inplace */
478 ~0x0100ffff, /* src_mask */
479 0x0100ffff, /* dst_mask */
480 TRUE), /* pcrel_offset */
481
482 HOWTO (R_MMIX_GETA_3, /* type */
483 2, /* rightshift */
484 2, /* size (0 = byte, 1 = short, 2 = long) */
485 19, /* bitsize */
486 TRUE, /* pc_relative */
487 0, /* bitpos */
488 complain_overflow_signed, /* complain_on_overflow */
489 mmix_elf_reloc, /* special_function */
490 "R_MMIX_GETA_3", /* name */
491 FALSE, /* partial_inplace */
492 ~0x0100ffff, /* src_mask */
493 0x0100ffff, /* dst_mask */
494 TRUE), /* pcrel_offset */
495
496 /* The conditional branches are supposed to reach any (code) address.
497 It can silently expand to a 64-bit operand, but will emit an error if
498 any of the two least significant bits are set. The howto members
499 reflect a simple branch. */
500 HOWTO (R_MMIX_CBRANCH, /* type */
501 2, /* rightshift */
502 2, /* size (0 = byte, 1 = short, 2 = long) */
503 19, /* bitsize */
504 TRUE, /* pc_relative */
505 0, /* bitpos */
506 complain_overflow_signed, /* complain_on_overflow */
507 mmix_elf_reloc, /* special_function */
508 "R_MMIX_CBRANCH", /* name */
509 FALSE, /* partial_inplace */
510 ~0x0100ffff, /* src_mask */
511 0x0100ffff, /* dst_mask */
512 TRUE), /* pcrel_offset */
513
514 HOWTO (R_MMIX_CBRANCH_J, /* type */
515 2, /* rightshift */
516 2, /* size (0 = byte, 1 = short, 2 = long) */
517 19, /* bitsize */
518 TRUE, /* pc_relative */
519 0, /* bitpos */
520 complain_overflow_signed, /* complain_on_overflow */
521 mmix_elf_reloc, /* special_function */
522 "R_MMIX_CBRANCH_J", /* name */
523 FALSE, /* partial_inplace */
524 ~0x0100ffff, /* src_mask */
525 0x0100ffff, /* dst_mask */
526 TRUE), /* pcrel_offset */
527
528 HOWTO (R_MMIX_CBRANCH_1, /* type */
529 2, /* rightshift */
530 2, /* size (0 = byte, 1 = short, 2 = long) */
531 19, /* bitsize */
532 TRUE, /* pc_relative */
533 0, /* bitpos */
534 complain_overflow_signed, /* complain_on_overflow */
535 mmix_elf_reloc, /* special_function */
536 "R_MMIX_CBRANCH_1", /* name */
537 FALSE, /* partial_inplace */
538 ~0x0100ffff, /* src_mask */
539 0x0100ffff, /* dst_mask */
540 TRUE), /* pcrel_offset */
541
542 HOWTO (R_MMIX_CBRANCH_2, /* type */
543 2, /* rightshift */
544 2, /* size (0 = byte, 1 = short, 2 = long) */
545 19, /* bitsize */
546 TRUE, /* pc_relative */
547 0, /* bitpos */
548 complain_overflow_signed, /* complain_on_overflow */
549 mmix_elf_reloc, /* special_function */
550 "R_MMIX_CBRANCH_2", /* name */
551 FALSE, /* partial_inplace */
552 ~0x0100ffff, /* src_mask */
553 0x0100ffff, /* dst_mask */
554 TRUE), /* pcrel_offset */
555
556 HOWTO (R_MMIX_CBRANCH_3, /* type */
557 2, /* rightshift */
558 2, /* size (0 = byte, 1 = short, 2 = long) */
559 19, /* bitsize */
560 TRUE, /* pc_relative */
561 0, /* bitpos */
562 complain_overflow_signed, /* complain_on_overflow */
563 mmix_elf_reloc, /* special_function */
564 "R_MMIX_CBRANCH_3", /* name */
565 FALSE, /* partial_inplace */
566 ~0x0100ffff, /* src_mask */
567 0x0100ffff, /* dst_mask */
568 TRUE), /* pcrel_offset */
569
570 /* The PUSHJ instruction can reach any (code) address, as long as it's
571 the beginning of a function (no usable restriction). It can silently
572 expand to a 64-bit operand, but will emit an error if any of the two
573 least significant bits are set. It can also expand into a call to a
574 stub; see R_MMIX_PUSHJ_STUBBABLE. The howto members reflect a simple
575 PUSHJ. */
576 HOWTO (R_MMIX_PUSHJ, /* type */
577 2, /* rightshift */
578 2, /* size (0 = byte, 1 = short, 2 = long) */
579 19, /* bitsize */
580 TRUE, /* pc_relative */
581 0, /* bitpos */
582 complain_overflow_signed, /* complain_on_overflow */
583 mmix_elf_reloc, /* special_function */
584 "R_MMIX_PUSHJ", /* name */
585 FALSE, /* partial_inplace */
586 ~0x0100ffff, /* src_mask */
587 0x0100ffff, /* dst_mask */
588 TRUE), /* pcrel_offset */
589
590 HOWTO (R_MMIX_PUSHJ_1, /* type */
591 2, /* rightshift */
592 2, /* size (0 = byte, 1 = short, 2 = long) */
593 19, /* bitsize */
594 TRUE, /* pc_relative */
595 0, /* bitpos */
596 complain_overflow_signed, /* complain_on_overflow */
597 mmix_elf_reloc, /* special_function */
598 "R_MMIX_PUSHJ_1", /* name */
599 FALSE, /* partial_inplace */
600 ~0x0100ffff, /* src_mask */
601 0x0100ffff, /* dst_mask */
602 TRUE), /* pcrel_offset */
603
604 HOWTO (R_MMIX_PUSHJ_2, /* type */
605 2, /* rightshift */
606 2, /* size (0 = byte, 1 = short, 2 = long) */
607 19, /* bitsize */
608 TRUE, /* pc_relative */
609 0, /* bitpos */
610 complain_overflow_signed, /* complain_on_overflow */
611 mmix_elf_reloc, /* special_function */
612 "R_MMIX_PUSHJ_2", /* name */
613 FALSE, /* partial_inplace */
614 ~0x0100ffff, /* src_mask */
615 0x0100ffff, /* dst_mask */
616 TRUE), /* pcrel_offset */
617
618 HOWTO (R_MMIX_PUSHJ_3, /* type */
619 2, /* rightshift */
620 2, /* size (0 = byte, 1 = short, 2 = long) */
621 19, /* bitsize */
622 TRUE, /* pc_relative */
623 0, /* bitpos */
624 complain_overflow_signed, /* complain_on_overflow */
625 mmix_elf_reloc, /* special_function */
626 "R_MMIX_PUSHJ_3", /* name */
627 FALSE, /* partial_inplace */
628 ~0x0100ffff, /* src_mask */
629 0x0100ffff, /* dst_mask */
630 TRUE), /* pcrel_offset */
631
632 /* A JMP is supposed to reach any (code) address. By itself, it can
633 reach +-64M; the expansion can reach all 64 bits. Note that the 64M
634 limit is soon reached if you link the program in wildly different
635 memory segments. The howto members reflect a trivial JMP. */
636 HOWTO (R_MMIX_JMP, /* type */
637 2, /* rightshift */
638 2, /* size (0 = byte, 1 = short, 2 = long) */
639 27, /* bitsize */
640 TRUE, /* pc_relative */
641 0, /* bitpos */
642 complain_overflow_signed, /* complain_on_overflow */
643 mmix_elf_reloc, /* special_function */
644 "R_MMIX_JMP", /* name */
645 FALSE, /* partial_inplace */
646 ~0x1ffffff, /* src_mask */
647 0x1ffffff, /* dst_mask */
648 TRUE), /* pcrel_offset */
649
650 HOWTO (R_MMIX_JMP_1, /* type */
651 2, /* rightshift */
652 2, /* size (0 = byte, 1 = short, 2 = long) */
653 27, /* bitsize */
654 TRUE, /* pc_relative */
655 0, /* bitpos */
656 complain_overflow_signed, /* complain_on_overflow */
657 mmix_elf_reloc, /* special_function */
658 "R_MMIX_JMP_1", /* name */
659 FALSE, /* partial_inplace */
660 ~0x1ffffff, /* src_mask */
661 0x1ffffff, /* dst_mask */
662 TRUE), /* pcrel_offset */
663
664 HOWTO (R_MMIX_JMP_2, /* type */
665 2, /* rightshift */
666 2, /* size (0 = byte, 1 = short, 2 = long) */
667 27, /* bitsize */
668 TRUE, /* pc_relative */
669 0, /* bitpos */
670 complain_overflow_signed, /* complain_on_overflow */
671 mmix_elf_reloc, /* special_function */
672 "R_MMIX_JMP_2", /* name */
673 FALSE, /* partial_inplace */
674 ~0x1ffffff, /* src_mask */
675 0x1ffffff, /* dst_mask */
676 TRUE), /* pcrel_offset */
677
678 HOWTO (R_MMIX_JMP_3, /* type */
679 2, /* rightshift */
680 2, /* size (0 = byte, 1 = short, 2 = long) */
681 27, /* bitsize */
682 TRUE, /* pc_relative */
683 0, /* bitpos */
684 complain_overflow_signed, /* complain_on_overflow */
685 mmix_elf_reloc, /* special_function */
686 "R_MMIX_JMP_3", /* name */
687 FALSE, /* partial_inplace */
688 ~0x1ffffff, /* src_mask */
689 0x1ffffff, /* dst_mask */
690 TRUE), /* pcrel_offset */
691
692 /* When we don't emit link-time-relaxable code from the assembler, or
693 when relaxation has done all it can do, these relocs are used. For
694 GETA/PUSHJ/branches. */
695 HOWTO (R_MMIX_ADDR19, /* type */
696 2, /* rightshift */
697 2, /* size (0 = byte, 1 = short, 2 = long) */
698 19, /* bitsize */
699 TRUE, /* pc_relative */
700 0, /* bitpos */
701 complain_overflow_signed, /* complain_on_overflow */
702 mmix_elf_reloc, /* special_function */
703 "R_MMIX_ADDR19", /* name */
704 FALSE, /* partial_inplace */
705 ~0x0100ffff, /* src_mask */
706 0x0100ffff, /* dst_mask */
707 TRUE), /* pcrel_offset */
708
709 /* For JMP. */
710 HOWTO (R_MMIX_ADDR27, /* type */
711 2, /* rightshift */
712 2, /* size (0 = byte, 1 = short, 2 = long) */
713 27, /* bitsize */
714 TRUE, /* pc_relative */
715 0, /* bitpos */
716 complain_overflow_signed, /* complain_on_overflow */
717 mmix_elf_reloc, /* special_function */
718 "R_MMIX_ADDR27", /* name */
719 FALSE, /* partial_inplace */
720 ~0x1ffffff, /* src_mask */
721 0x1ffffff, /* dst_mask */
722 TRUE), /* pcrel_offset */
723
724 /* A general register or the value 0..255. If a value, then the
725 instruction (offset -3) needs adjusting. */
726 HOWTO (R_MMIX_REG_OR_BYTE, /* type */
727 0, /* rightshift */
728 1, /* size (0 = byte, 1 = short, 2 = long) */
729 8, /* bitsize */
730 FALSE, /* pc_relative */
731 0, /* bitpos */
732 complain_overflow_bitfield, /* complain_on_overflow */
733 mmix_elf_reloc, /* special_function */
734 "R_MMIX_REG_OR_BYTE", /* name */
735 FALSE, /* partial_inplace */
736 0, /* src_mask */
737 0xff, /* dst_mask */
738 FALSE), /* pcrel_offset */
739
740 /* A general register. */
741 HOWTO (R_MMIX_REG, /* type */
742 0, /* rightshift */
743 1, /* size (0 = byte, 1 = short, 2 = long) */
744 8, /* bitsize */
745 FALSE, /* pc_relative */
746 0, /* bitpos */
747 complain_overflow_bitfield, /* complain_on_overflow */
748 mmix_elf_reloc, /* special_function */
749 "R_MMIX_REG", /* name */
750 FALSE, /* partial_inplace */
751 0, /* src_mask */
752 0xff, /* dst_mask */
753 FALSE), /* pcrel_offset */
754
755 /* A register plus an index, corresponding to the relocation expression.
756 The sizes must correspond to the valid range of the expression, while
757 the bitmasks correspond to what we store in the image. */
758 HOWTO (R_MMIX_BASE_PLUS_OFFSET, /* type */
759 0, /* rightshift */
760 4, /* size (0 = byte, 1 = short, 2 = long) */
761 64, /* bitsize */
762 FALSE, /* pc_relative */
763 0, /* bitpos */
764 complain_overflow_bitfield, /* complain_on_overflow */
765 mmix_elf_reloc, /* special_function */
766 "R_MMIX_BASE_PLUS_OFFSET", /* name */
767 FALSE, /* partial_inplace */
768 0, /* src_mask */
769 0xffff, /* dst_mask */
770 FALSE), /* pcrel_offset */
771
772 /* A "magic" relocation for a LOCAL expression, asserting that the
773 expression is less than the number of global registers. No actual
774 modification of the contents is done. Implementing this as a
775 relocation was less intrusive than e.g. putting such expressions in a
776 section to discard *after* relocation. */
777 HOWTO (R_MMIX_LOCAL, /* type */
778 0, /* rightshift */
779 0, /* size (0 = byte, 1 = short, 2 = long) */
780 0, /* bitsize */
781 FALSE, /* pc_relative */
782 0, /* bitpos */
783 complain_overflow_dont, /* complain_on_overflow */
784 mmix_elf_reloc, /* special_function */
785 "R_MMIX_LOCAL", /* name */
786 FALSE, /* partial_inplace */
787 0, /* src_mask */
788 0, /* dst_mask */
789 FALSE), /* pcrel_offset */
790
791 HOWTO (R_MMIX_PUSHJ_STUBBABLE, /* type */
792 2, /* rightshift */
793 2, /* size (0 = byte, 1 = short, 2 = long) */
794 19, /* bitsize */
795 TRUE, /* pc_relative */
796 0, /* bitpos */
797 complain_overflow_signed, /* complain_on_overflow */
798 mmix_elf_reloc, /* special_function */
799 "R_MMIX_PUSHJ_STUBBABLE", /* name */
800 FALSE, /* partial_inplace */
801 ~0x0100ffff, /* src_mask */
802 0x0100ffff, /* dst_mask */
803 TRUE) /* pcrel_offset */
804 };
805
806
807/* Map BFD reloc types to MMIX ELF reloc types. */
808
809struct mmix_reloc_map
810 {
811 bfd_reloc_code_real_type bfd_reloc_val;
812 enum elf_mmix_reloc_type elf_reloc_val;
813 };
814
815
816static const struct mmix_reloc_map mmix_reloc_map[] =
817 {
818 {BFD_RELOC_NONE, R_MMIX_NONE},
819 {BFD_RELOC_8, R_MMIX_8},
820 {BFD_RELOC_16, R_MMIX_16},
821 {BFD_RELOC_24, R_MMIX_24},
822 {BFD_RELOC_32, R_MMIX_32},
823 {BFD_RELOC_64, R_MMIX_64},
824 {BFD_RELOC_8_PCREL, R_MMIX_PC_8},
825 {BFD_RELOC_16_PCREL, R_MMIX_PC_16},
826 {BFD_RELOC_24_PCREL, R_MMIX_PC_24},
827 {BFD_RELOC_32_PCREL, R_MMIX_PC_32},
828 {BFD_RELOC_64_PCREL, R_MMIX_PC_64},
829 {BFD_RELOC_VTABLE_INHERIT, R_MMIX_GNU_VTINHERIT},
830 {BFD_RELOC_VTABLE_ENTRY, R_MMIX_GNU_VTENTRY},
831 {BFD_RELOC_MMIX_GETA, R_MMIX_GETA},
832 {BFD_RELOC_MMIX_CBRANCH, R_MMIX_CBRANCH},
833 {BFD_RELOC_MMIX_PUSHJ, R_MMIX_PUSHJ},
834 {BFD_RELOC_MMIX_JMP, R_MMIX_JMP},
835 {BFD_RELOC_MMIX_ADDR19, R_MMIX_ADDR19},
836 {BFD_RELOC_MMIX_ADDR27, R_MMIX_ADDR27},
837 {BFD_RELOC_MMIX_REG_OR_BYTE, R_MMIX_REG_OR_BYTE},
838 {BFD_RELOC_MMIX_REG, R_MMIX_REG},
839 {BFD_RELOC_MMIX_BASE_PLUS_OFFSET, R_MMIX_BASE_PLUS_OFFSET},
840 {BFD_RELOC_MMIX_LOCAL, R_MMIX_LOCAL},
841 {BFD_RELOC_MMIX_PUSHJ_STUBBABLE, R_MMIX_PUSHJ_STUBBABLE}
842 };
843
844static reloc_howto_type *
845bfd_elf64_bfd_reloc_type_lookup (abfd, code)
846 bfd *abfd ATTRIBUTE_UNUSED;
847 bfd_reloc_code_real_type code;
848{
849 unsigned int i;
850
851 for (i = 0;
852 i < sizeof (mmix_reloc_map) / sizeof (mmix_reloc_map[0]);
853 i++)
854 {
855 if (mmix_reloc_map[i].bfd_reloc_val == code)
856 return &elf_mmix_howto_table[mmix_reloc_map[i].elf_reloc_val];
857 }
858
859 return NULL;
860}
861
862static bfd_boolean
863mmix_elf_new_section_hook (abfd, sec)
864 bfd *abfd;
865 asection *sec;
866{
867 struct _mmix_elf_section_data *sdata;
868 bfd_size_type amt = sizeof (*sdata);
869
870 sdata = (struct _mmix_elf_section_data *) bfd_zalloc (abfd, amt);
871 if (sdata == NULL)
872 return FALSE;
873 sec->used_by_bfd = (PTR) sdata;
874
875 return _bfd_elf_new_section_hook (abfd, sec);
876}
877
878
879/* This function performs the actual bitfiddling and sanity check for a
880 final relocation. Each relocation gets its *worst*-case expansion
881 in size when it arrives here; any reduction in size should have been
882 caught in linker relaxation earlier. When we get here, the relocation
883 looks like the smallest instruction with SWYM:s (nop:s) appended to the
884 max size. We fill in those nop:s.
885
886 R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra)
887 GETA $N,foo
888 ->
889 SETL $N,foo & 0xffff
890 INCML $N,(foo >> 16) & 0xffff
891 INCMH $N,(foo >> 32) & 0xffff
892 INCH $N,(foo >> 48) & 0xffff
893
894 R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but
895 condbranches needing relaxation might be rare enough to not be
896 worthwhile.)
897 [P]Bcc $N,foo
898 ->
899 [~P]B~cc $N,.+20
900 SETL $255,foo & ...
901 INCML ...
902 INCMH ...
903 INCH ...
904 GO $255,$255,0
905
906 R_MMIX_PUSHJ: (FIXME: Relaxation...)
907 PUSHJ $N,foo
908 ->
909 SETL $255,foo & ...
910 INCML ...
911 INCMH ...
912 INCH ...
913 PUSHGO $N,$255,0
914
915 R_MMIX_JMP: (FIXME: Relaxation...)
916 JMP foo
917 ->
918 SETL $255,foo & ...
919 INCML ...
920 INCMH ...
921 INCH ...
922 GO $255,$255,0
923
924 R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */
925
926static bfd_reloc_status_type
927mmix_elf_perform_relocation (isec, howto, datap, addr, value)
928 asection *isec;
929 reloc_howto_type *howto;
930 PTR datap;
931 bfd_vma addr;
932 bfd_vma value;
933{
934 bfd *abfd = isec->owner;
935 bfd_reloc_status_type flag = bfd_reloc_ok;
936 bfd_reloc_status_type r;
937 int offs = 0;
938 int reg = 255;
939
940 /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences.
941 We handle the differences here and the common sequence later. */
942 switch (howto->type)
943 {
944 case R_MMIX_GETA:
945 offs = 0;
946 reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1);
947
948 /* We change to an absolute value. */
949 value += addr;
950 break;
951
952 case R_MMIX_CBRANCH:
953 {
954 int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16;
955
956 /* Invert the condition and prediction bit, and set the offset
957 to five instructions ahead.
958
959 We *can* do better if we want to. If the branch is found to be
960 within limits, we could leave the branch as is; there'll just
961 be a bunch of NOP:s after it. But we shouldn't see this
962 sequence often enough that it's worth doing it. */
963
964 bfd_put_32 (abfd,
965 (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff)
966 | (24/4)),
967 (bfd_byte *) datap);
968
969 /* Put a "GO $255,$255,0" after the common sequence. */
970 bfd_put_32 (abfd,
971 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00,
972 (bfd_byte *) datap + 20);
973
974 /* Common sequence starts at offset 4. */
975 offs = 4;
976
977 /* We change to an absolute value. */
978 value += addr;
979 }
980 break;
981
982 case R_MMIX_PUSHJ_STUBBABLE:
983 /* If the address fits, we're fine. */
984 if ((value & 3) == 0
985 /* Note rightshift 0; see R_MMIX_JMP case below. */
986 && (r = bfd_check_overflow (complain_overflow_signed,
987 howto->bitsize,
988 0,
989 bfd_arch_bits_per_address (abfd),
990 value)) == bfd_reloc_ok)
991 goto pcrel_mmix_reloc_fits;
992 else
993 {
994 bfd_size_type size = isec->rawsize ? isec->rawsize : isec->size;
995
996 /* We have the bytes at the PUSHJ insn and need to get the
997 position for the stub. There's supposed to be room allocated
998 for the stub. */
999 bfd_byte *stubcontents
1000 = ((char *) datap
1001 - (addr - (isec->output_section->vma + isec->output_offset))
1002 + size
1003 + mmix_elf_section_data (isec)->pjs.stub_offset);
1004 bfd_vma stubaddr;
1005
1006 /* The address doesn't fit, so redirect the PUSHJ to the
1007 location of the stub. */
1008 r = mmix_elf_perform_relocation (isec,
1009 &elf_mmix_howto_table
1010 [R_MMIX_ADDR19],
1011 datap,
1012 addr,
1013 isec->output_section->vma
1014 + isec->output_offset
1015 + size
1016 + (mmix_elf_section_data (isec)
1017 ->pjs.stub_offset)
1018 - addr);
1019 if (r != bfd_reloc_ok)
1020 return r;
1021
1022 stubaddr
1023 = (isec->output_section->vma
1024 + isec->output_offset
1025 + size
1026 + mmix_elf_section_data (isec)->pjs.stub_offset);
1027
1028 /* We generate a simple JMP if that suffices, else the whole 5
1029 insn stub. */
1030 if (bfd_check_overflow (complain_overflow_signed,
1031 elf_mmix_howto_table[R_MMIX_ADDR27].bitsize,
1032 0,
1033 bfd_arch_bits_per_address (abfd),
1034 addr + value - stubaddr) == bfd_reloc_ok)
1035 {
1036 bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents);
1037 r = mmix_elf_perform_relocation (isec,
1038 &elf_mmix_howto_table
1039 [R_MMIX_ADDR27],
1040 stubcontents,
1041 stubaddr,
1042 value + addr - stubaddr);
1043 mmix_elf_section_data (isec)->pjs.stub_offset += 4;
1044
1045 if (size + mmix_elf_section_data (isec)->pjs.stub_offset
1046 > isec->size)
1047 abort ();
1048
1049 return r;
1050 }
1051 else
1052 {
1053 /* Put a "GO $255,0" after the common sequence. */
1054 bfd_put_32 (abfd,
1055 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
1056 | 0xff00, (bfd_byte *) stubcontents + 16);
1057
1058 /* Prepare for the general code to set the first part of the
1059 linker stub, and */
1060 value += addr;
1061 datap = stubcontents;
1062 mmix_elf_section_data (isec)->pjs.stub_offset
1063 += MAX_PUSHJ_STUB_SIZE;
1064 }
1065 }
1066 break;
1067
1068 case R_MMIX_PUSHJ:
1069 {
1070 int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1);
1071
1072 /* Put a "PUSHGO $N,$255,0" after the common sequence. */
1073 bfd_put_32 (abfd,
1074 ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
1075 | (inreg << 16)
1076 | 0xff00,
1077 (bfd_byte *) datap + 16);
1078
1079 /* We change to an absolute value. */
1080 value += addr;
1081 }
1082 break;
1083
1084 case R_MMIX_JMP:
1085 /* This one is a little special. If we get here on a non-relaxing
1086 link, and the destination is actually in range, we don't need to
1087 execute the nops.
1088 If so, we fall through to the bit-fiddling relocs.
1089
1090 FIXME: bfd_check_overflow seems broken; the relocation is
1091 rightshifted before testing, so supply a zero rightshift. */
1092
1093 if (! ((value & 3) == 0
1094 && (r = bfd_check_overflow (complain_overflow_signed,
1095 howto->bitsize,
1096 0,
1097 bfd_arch_bits_per_address (abfd),
1098 value)) == bfd_reloc_ok))
1099 {
1100 /* If the relocation doesn't fit in a JMP, we let the NOP:s be
1101 modified below, and put a "GO $255,$255,0" after the
1102 address-loading sequence. */
1103 bfd_put_32 (abfd,
1104 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
1105 | 0xffff00,
1106 (bfd_byte *) datap + 16);
1107
1108 /* We change to an absolute value. */
1109 value += addr;
1110 break;
1111 }
1112 /* FALLTHROUGH. */
1113 case R_MMIX_ADDR19:
1114 case R_MMIX_ADDR27:
1115 pcrel_mmix_reloc_fits:
1116 /* These must be in range, or else we emit an error. */
1117 if ((value & 3) == 0
1118 /* Note rightshift 0; see above. */
1119 && (r = bfd_check_overflow (complain_overflow_signed,
1120 howto->bitsize,
1121 0,
1122 bfd_arch_bits_per_address (abfd),
1123 value)) == bfd_reloc_ok)
1124 {
1125 bfd_vma in1
1126 = bfd_get_32 (abfd, (bfd_byte *) datap);
1127 bfd_vma highbit;
1128
1129 if ((bfd_signed_vma) value < 0)
1130 {
1131 highbit = 1 << 24;
1132 value += (1 << (howto->bitsize - 1));
1133 }
1134 else
1135 highbit = 0;
1136
1137 value >>= 2;
1138
1139 bfd_put_32 (abfd,
1140 (in1 & howto->src_mask)
1141 | highbit
1142 | (value & howto->dst_mask),
1143 (bfd_byte *) datap);
1144
1145 return bfd_reloc_ok;
1146 }
1147 else
1148 return bfd_reloc_overflow;
1149
1150 case R_MMIX_BASE_PLUS_OFFSET:
1151 {
1152 struct bpo_reloc_section_info *bpodata
1153 = mmix_elf_section_data (isec)->bpo.reloc;
1154 asection *bpo_greg_section
1155 = bpodata->bpo_greg_section;
1156 struct bpo_greg_section_info *gregdata
1157 = mmix_elf_section_data (bpo_greg_section)->bpo.greg;
1158 size_t bpo_index
1159 = gregdata->bpo_reloc_indexes[bpodata->bpo_index++];
1160
1161 /* A consistency check: The value we now have in "relocation" must
1162 be the same as the value we stored for that relocation. It
1163 doesn't cost much, so can be left in at all times. */
1164 if (value != gregdata->reloc_request[bpo_index].value)
1165 {
1166 (*_bfd_error_handler)
1167 (_("%s: Internal inconsistency error for value for\n\
1168 linker-allocated global register: linked: 0x%lx%08lx != relaxed: 0x%lx%08lx\n"),
1169 bfd_get_filename (isec->owner),
1170 (unsigned long) (value >> 32), (unsigned long) value,
1171 (unsigned long) (gregdata->reloc_request[bpo_index].value
1172 >> 32),
1173 (unsigned long) gregdata->reloc_request[bpo_index].value);
1174 bfd_set_error (bfd_error_bad_value);
1175 return bfd_reloc_overflow;
1176 }
1177
1178 /* Then store the register number and offset for that register
1179 into datap and datap + 1 respectively. */
1180 bfd_put_8 (abfd,
1181 gregdata->reloc_request[bpo_index].regindex
1182 + bpo_greg_section->output_section->vma / 8,
1183 datap);
1184 bfd_put_8 (abfd,
1185 gregdata->reloc_request[bpo_index].offset,
1186 ((unsigned char *) datap) + 1);
1187 return bfd_reloc_ok;
1188 }
1189
1190 case R_MMIX_REG_OR_BYTE:
1191 case R_MMIX_REG:
1192 if (value > 255)
1193 return bfd_reloc_overflow;
1194 bfd_put_8 (abfd, value, datap);
1195 return bfd_reloc_ok;
1196
1197 default:
1198 BAD_CASE (howto->type);
1199 }
1200
1201 /* This code adds the common SETL/INCML/INCMH/INCH worst-case
1202 sequence. */
1203
1204 /* Lowest two bits must be 0. We return bfd_reloc_overflow for
1205 everything that looks strange. */
1206 if (value & 3)
1207 flag = bfd_reloc_overflow;
1208
1209 bfd_put_32 (abfd,
1210 (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16),
1211 (bfd_byte *) datap + offs);
1212 bfd_put_32 (abfd,
1213 (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16),
1214 (bfd_byte *) datap + offs + 4);
1215 bfd_put_32 (abfd,
1216 (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16),
1217 (bfd_byte *) datap + offs + 8);
1218 bfd_put_32 (abfd,
1219 (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16),
1220 (bfd_byte *) datap + offs + 12);
1221
1222 return flag;
1223}
1224
1225/* Set the howto pointer for an MMIX ELF reloc (type RELA). */
1226
1227static void
1228mmix_info_to_howto_rela (abfd, cache_ptr, dst)
1229 bfd *abfd ATTRIBUTE_UNUSED;
1230 arelent *cache_ptr;
1231 Elf_Internal_Rela *dst;
1232{
1233 unsigned int r_type;
1234
1235 r_type = ELF64_R_TYPE (dst->r_info);
1236 BFD_ASSERT (r_type < (unsigned int) R_MMIX_max);
1237 cache_ptr->howto = &elf_mmix_howto_table[r_type];
1238}
1239
1240/* Any MMIX-specific relocation gets here at assembly time or when linking
1241 to other formats (such as mmo); this is the relocation function from
1242 the reloc_table. We don't get here for final pure ELF linking. */
1243
1244static bfd_reloc_status_type
1245mmix_elf_reloc (abfd, reloc_entry, symbol, data, input_section,
1246 output_bfd, error_message)
1247 bfd *abfd;
1248 arelent *reloc_entry;
1249 asymbol *symbol;
1250 PTR data;
1251 asection *input_section;
1252 bfd *output_bfd;
1253 char **error_message ATTRIBUTE_UNUSED;
1254{
1255 bfd_vma relocation;
1256 bfd_reloc_status_type r;
1257 asection *reloc_target_output_section;
1258 bfd_reloc_status_type flag = bfd_reloc_ok;
1259 bfd_vma output_base = 0;
1260 bfd_vma addr;
1261
1262 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1263 input_section, output_bfd, error_message);
1264
1265 /* If that was all that was needed (i.e. this isn't a final link, only
1266 some segment adjustments), we're done. */
1267 if (r != bfd_reloc_continue)
1268 return r;
1269
1270 if (bfd_is_und_section (symbol->section)
1271 && (symbol->flags & BSF_WEAK) == 0
1272 && output_bfd == (bfd *) NULL)
1273 return bfd_reloc_undefined;
1274
1275 /* Is the address of the relocation really within the section? */
1276 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1277 return bfd_reloc_outofrange;
1278
1279 /* Work out which section the relocation is targeted at and the
1280 initial relocation command value. */
1281
1282 /* Get symbol value. (Common symbols are special.) */
1283 if (bfd_is_com_section (symbol->section))
1284 relocation = 0;
1285 else
1286 relocation = symbol->value;
1287
1288 reloc_target_output_section = bfd_get_output_section (symbol);
1289
1290 /* Here the variable relocation holds the final address of the symbol we
1291 are relocating against, plus any addend. */
1292 if (output_bfd)
1293 output_base = 0;
1294 else
1295 output_base = reloc_target_output_section->vma;
1296
1297 relocation += output_base + symbol->section->output_offset;
1298
1299 /* Get position of relocation. */
1300 addr = (reloc_entry->address + input_section->output_section->vma
1301 + input_section->output_offset);
1302 if (output_bfd != (bfd *) NULL)
1303 {
1304 /* Add in supplied addend. */
1305 relocation += reloc_entry->addend;
1306
1307 /* This is a partial relocation, and we want to apply the
1308 relocation to the reloc entry rather than the raw data.
1309 Modify the reloc inplace to reflect what we now know. */
1310 reloc_entry->addend = relocation;
1311 reloc_entry->address += input_section->output_offset;
1312 return flag;
1313 }
1314
1315 return mmix_final_link_relocate (reloc_entry->howto, input_section,
1316 data, reloc_entry->address,
1317 reloc_entry->addend, relocation,
1318 bfd_asymbol_name (symbol),
1319 reloc_target_output_section);
1320}
1321\f
1322/* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it
1323 for guidance if you're thinking of copying this. */
1324
1325static bfd_boolean
1326mmix_elf_relocate_section (output_bfd, info, input_bfd, input_section,
1327 contents, relocs, local_syms, local_sections)
1328 bfd *output_bfd ATTRIBUTE_UNUSED;
1329 struct bfd_link_info *info;
1330 bfd *input_bfd;
1331 asection *input_section;
1332 bfd_byte *contents;
1333 Elf_Internal_Rela *relocs;
1334 Elf_Internal_Sym *local_syms;
1335 asection **local_sections;
1336{
1337 Elf_Internal_Shdr *symtab_hdr;
1338 struct elf_link_hash_entry **sym_hashes;
1339 Elf_Internal_Rela *rel;
1340 Elf_Internal_Rela *relend;
1341 bfd_size_type size;
1342 size_t pjsno = 0;
1343
1344 size = input_section->rawsize ? input_section->rawsize : input_section->size;
1345 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1346 sym_hashes = elf_sym_hashes (input_bfd);
1347 relend = relocs + input_section->reloc_count;
1348
1349 /* Zero the stub area before we start. */
1350 if (input_section->rawsize != 0
1351 && input_section->size > input_section->rawsize)
1352 memset (contents + input_section->rawsize, 0,
1353 input_section->size - input_section->rawsize);
1354
1355 for (rel = relocs; rel < relend; rel ++)
1356 {
1357 reloc_howto_type *howto;
1358 unsigned long r_symndx;
1359 Elf_Internal_Sym *sym;
1360 asection *sec;
1361 struct elf_link_hash_entry *h;
1362 bfd_vma relocation;
1363 bfd_reloc_status_type r;
1364 const char *name = NULL;
1365 int r_type;
1366 bfd_boolean undefined_signalled = FALSE;
1367
1368 r_type = ELF64_R_TYPE (rel->r_info);
1369
1370 if (r_type == R_MMIX_GNU_VTINHERIT
1371 || r_type == R_MMIX_GNU_VTENTRY)
1372 continue;
1373
1374 r_symndx = ELF64_R_SYM (rel->r_info);
1375
1376 if (info->relocatable)
1377 {
1378 /* This is a relocatable link. For most relocs we don't have to
1379 change anything, unless the reloc is against a section
1380 symbol, in which case we have to adjust according to where
1381 the section symbol winds up in the output section. */
1382 if (r_symndx < symtab_hdr->sh_info)
1383 {
1384 sym = local_syms + r_symndx;
1385
1386 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1387 {
1388 sec = local_sections [r_symndx];
1389 rel->r_addend += sec->output_offset + sym->st_value;
1390 }
1391 }
1392
1393 /* For PUSHJ stub relocs however, we may need to change the
1394 reloc and the section contents, if the reloc doesn't reach
1395 beyond the end of the output section and previous stubs.
1396 Then we change the section contents to be a PUSHJ to the end
1397 of the input section plus stubs (we can do that without using
1398 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ
1399 at the stub location. */
1400 if (r_type == R_MMIX_PUSHJ_STUBBABLE)
1401 {
1402 /* We've already checked whether we need a stub; use that
1403 knowledge. */
1404 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno]
1405 != 0)
1406 {
1407 Elf_Internal_Rela relcpy;
1408
1409 if (mmix_elf_section_data (input_section)
1410 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE)
1411 abort ();
1412
1413 /* There's already a PUSHJ insn there, so just fill in
1414 the offset bits to the stub. */
1415 if (mmix_final_link_relocate (elf_mmix_howto_table
1416 + R_MMIX_ADDR19,
1417 input_section,
1418 contents,
1419 rel->r_offset,
1420 0,
1421 input_section
1422 ->output_section->vma
1423 + input_section->output_offset
1424 + size
1425 + mmix_elf_section_data (input_section)
1426 ->pjs.stub_offset,
1427 NULL, NULL) != bfd_reloc_ok)
1428 return FALSE;
1429
1430 /* Put a JMP insn at the stub; it goes with the
1431 R_MMIX_JMP reloc. */
1432 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24,
1433 contents
1434 + size
1435 + mmix_elf_section_data (input_section)
1436 ->pjs.stub_offset);
1437
1438 /* Change the reloc to be at the stub, and to a full
1439 R_MMIX_JMP reloc. */
1440 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP);
1441 rel->r_offset
1442 = (size
1443 + mmix_elf_section_data (input_section)
1444 ->pjs.stub_offset);
1445
1446 mmix_elf_section_data (input_section)->pjs.stub_offset
1447 += MAX_PUSHJ_STUB_SIZE;
1448
1449 /* Shift this reloc to the end of the relocs to maintain
1450 the r_offset sorted reloc order. */
1451 relcpy = *rel;
1452 memmove (rel, rel + 1, (char *) relend - (char *) rel);
1453 relend[-1] = relcpy;
1454
1455 /* Back up one reloc, or else we'd skip the next reloc
1456 in turn. */
1457 rel--;
1458 }
1459
1460 pjsno++;
1461 }
1462 continue;
1463 }
1464
1465 /* This is a final link. */
1466 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info);
1467 h = NULL;
1468 sym = NULL;
1469 sec = NULL;
1470
1471 if (r_symndx < symtab_hdr->sh_info)
1472 {
1473 sym = local_syms + r_symndx;
1474 sec = local_sections [r_symndx];
1475 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1476
1477 name = bfd_elf_string_from_elf_section (input_bfd,
1478 symtab_hdr->sh_link,
1479 sym->st_name);
1480 if (name == NULL)
1481 name = bfd_section_name (input_bfd, sec);
1482 }
1483 else
1484 {
1485 bfd_boolean unresolved_reloc;
1486
1487 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1488 r_symndx, symtab_hdr, sym_hashes,
1489 h, sec, relocation,
1490 unresolved_reloc, undefined_signalled);
1491 name = h->root.root.string;
1492 }
1493
1494 r = mmix_final_link_relocate (howto, input_section,
1495 contents, rel->r_offset,
1496 rel->r_addend, relocation, name, sec);
1497
1498 if (r != bfd_reloc_ok)
1499 {
1500 bfd_boolean check_ok = TRUE;
1501 const char * msg = (const char *) NULL;
1502
1503 switch (r)
1504 {
1505 case bfd_reloc_overflow:
1506 check_ok = info->callbacks->reloc_overflow
1507 (info, name, howto->name, (bfd_vma) 0,
1508 input_bfd, input_section, rel->r_offset);
1509 break;
1510
1511 case bfd_reloc_undefined:
1512 /* We may have sent this message above. */
1513 if (! undefined_signalled)
1514 check_ok = info->callbacks->undefined_symbol
1515 (info, name, input_bfd, input_section, rel->r_offset,
1516 TRUE);
1517 undefined_signalled = TRUE;
1518 break;
1519
1520 case bfd_reloc_outofrange:
1521 msg = _("internal error: out of range error");
1522 break;
1523
1524 case bfd_reloc_notsupported:
1525 msg = _("internal error: unsupported relocation error");
1526 break;
1527
1528 case bfd_reloc_dangerous:
1529 msg = _("internal error: dangerous relocation");
1530 break;
1531
1532 default:
1533 msg = _("internal error: unknown error");
1534 break;
1535 }
1536
1537 if (msg)
1538 check_ok = info->callbacks->warning
1539 (info, msg, name, input_bfd, input_section, rel->r_offset);
1540
1541 if (! check_ok)
1542 return FALSE;
1543 }
1544 }
1545
1546 return TRUE;
1547}
1548\f
1549/* Perform a single relocation. By default we use the standard BFD
1550 routines. A few relocs we have to do ourselves. */
1551
1552static bfd_reloc_status_type
1553mmix_final_link_relocate (howto, input_section, contents,
1554 r_offset, r_addend, relocation, symname, symsec)
1555 reloc_howto_type *howto;
1556 asection *input_section;
1557 bfd_byte *contents;
1558 bfd_vma r_offset;
1559 bfd_signed_vma r_addend;
1560 bfd_vma relocation;
1561 const char *symname;
1562 asection *symsec;
1563{
1564 bfd_reloc_status_type r = bfd_reloc_ok;
1565 bfd_vma addr
1566 = (input_section->output_section->vma
1567 + input_section->output_offset
1568 + r_offset);
1569 bfd_signed_vma srel
1570 = (bfd_signed_vma) relocation + r_addend;
1571
1572 switch (howto->type)
1573 {
1574 /* All these are PC-relative. */
1575 case R_MMIX_PUSHJ_STUBBABLE:
1576 case R_MMIX_PUSHJ:
1577 case R_MMIX_CBRANCH:
1578 case R_MMIX_ADDR19:
1579 case R_MMIX_GETA:
1580 case R_MMIX_ADDR27:
1581 case R_MMIX_JMP:
1582 contents += r_offset;
1583
1584 srel -= (input_section->output_section->vma
1585 + input_section->output_offset
1586 + r_offset);
1587
1588 r = mmix_elf_perform_relocation (input_section, howto, contents,
1589 addr, srel);
1590 break;
1591
1592 case R_MMIX_BASE_PLUS_OFFSET:
1593 if (symsec == NULL)
1594 return bfd_reloc_undefined;
1595
1596 /* Check that we're not relocating against a register symbol. */
1597 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1598 MMIX_REG_CONTENTS_SECTION_NAME) == 0
1599 || strcmp (bfd_get_section_name (symsec->owner, symsec),
1600 MMIX_REG_SECTION_NAME) == 0)
1601 {
1602 /* Note: This is separated out into two messages in order
1603 to ease the translation into other languages. */
1604 if (symname == NULL || *symname == 0)
1605 (*_bfd_error_handler)
1606 (_("%s: base-plus-offset relocation against register symbol: (unknown) in %s"),
1607 bfd_get_filename (input_section->owner),
1608 bfd_get_section_name (symsec->owner, symsec));
1609 else
1610 (*_bfd_error_handler)
1611 (_("%s: base-plus-offset relocation against register symbol: %s in %s"),
1612 bfd_get_filename (input_section->owner), symname,
1613 bfd_get_section_name (symsec->owner, symsec));
1614 return bfd_reloc_overflow;
1615 }
1616 goto do_mmix_reloc;
1617
1618 case R_MMIX_REG_OR_BYTE:
1619 case R_MMIX_REG:
1620 /* For now, we handle these alike. They must refer to an register
1621 symbol, which is either relative to the register section and in
1622 the range 0..255, or is in the register contents section with vma
1623 regno * 8. */
1624
1625 /* FIXME: A better way to check for reg contents section?
1626 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */
1627 if (symsec == NULL)
1628 return bfd_reloc_undefined;
1629
1630 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1631 MMIX_REG_CONTENTS_SECTION_NAME) == 0)
1632 {
1633 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
1634 {
1635 /* The bfd_reloc_outofrange return value, though intuitively
1636 a better value, will not get us an error. */
1637 return bfd_reloc_overflow;
1638 }
1639 srel /= 8;
1640 }
1641 else if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1642 MMIX_REG_SECTION_NAME) == 0)
1643 {
1644 if (srel < 0 || srel > 255)
1645 /* The bfd_reloc_outofrange return value, though intuitively a
1646 better value, will not get us an error. */
1647 return bfd_reloc_overflow;
1648 }
1649 else
1650 {
1651 /* Note: This is separated out into two messages in order
1652 to ease the translation into other languages. */
1653 if (symname == NULL || *symname == 0)
1654 (*_bfd_error_handler)
1655 (_("%s: register relocation against non-register symbol: (unknown) in %s"),
1656 bfd_get_filename (input_section->owner),
1657 bfd_get_section_name (symsec->owner, symsec));
1658 else
1659 (*_bfd_error_handler)
1660 (_("%s: register relocation against non-register symbol: %s in %s"),
1661 bfd_get_filename (input_section->owner), symname,
1662 bfd_get_section_name (symsec->owner, symsec));
1663
1664 /* The bfd_reloc_outofrange return value, though intuitively a
1665 better value, will not get us an error. */
1666 return bfd_reloc_overflow;
1667 }
1668 do_mmix_reloc:
1669 contents += r_offset;
1670 r = mmix_elf_perform_relocation (input_section, howto, contents,
1671 addr, srel);
1672 break;
1673
1674 case R_MMIX_LOCAL:
1675 /* This isn't a real relocation, it's just an assertion that the
1676 final relocation value corresponds to a local register. We
1677 ignore the actual relocation; nothing is changed. */
1678 {
1679 asection *regsec
1680 = bfd_get_section_by_name (input_section->output_section->owner,
1681 MMIX_REG_CONTENTS_SECTION_NAME);
1682 bfd_vma first_global;
1683
1684 /* Check that this is an absolute value, or a reference to the
1685 register contents section or the register (symbol) section.
1686 Absolute numbers can get here as undefined section. Undefined
1687 symbols are signalled elsewhere, so there's no conflict in us
1688 accidentally handling it. */
1689 if (!bfd_is_abs_section (symsec)
1690 && !bfd_is_und_section (symsec)
1691 && strcmp (bfd_get_section_name (symsec->owner, symsec),
1692 MMIX_REG_CONTENTS_SECTION_NAME) != 0
1693 && strcmp (bfd_get_section_name (symsec->owner, symsec),
1694 MMIX_REG_SECTION_NAME) != 0)
1695 {
1696 (*_bfd_error_handler)
1697 (_("%s: directive LOCAL valid only with a register or absolute value"),
1698 bfd_get_filename (input_section->owner));
1699
1700 return bfd_reloc_overflow;
1701 }
1702
1703 /* If we don't have a register contents section, then $255 is the
1704 first global register. */
1705 if (regsec == NULL)
1706 first_global = 255;
1707 else
1708 {
1709 first_global = bfd_get_section_vma (abfd, regsec) / 8;
1710 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1711 MMIX_REG_CONTENTS_SECTION_NAME) == 0)
1712 {
1713 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
1714 /* The bfd_reloc_outofrange return value, though
1715 intuitively a better value, will not get us an error. */
1716 return bfd_reloc_overflow;
1717 srel /= 8;
1718 }
1719 }
1720
1721 if ((bfd_vma) srel >= first_global)
1722 {
1723 /* FIXME: Better error message. */
1724 (*_bfd_error_handler)
1725 (_("%s: LOCAL directive: Register $%ld is not a local register. First global register is $%ld."),
1726 bfd_get_filename (input_section->owner), (long) srel, (long) first_global);
1727
1728 return bfd_reloc_overflow;
1729 }
1730 }
1731 r = bfd_reloc_ok;
1732 break;
1733
1734 default:
1735 r = _bfd_final_link_relocate (howto, input_section->owner, input_section,
1736 contents, r_offset,
1737 relocation, r_addend);
1738 }
1739
1740 return r;
1741}
1742\f
1743/* Return the section that should be marked against GC for a given
1744 relocation. */
1745
1746static asection *
1747mmix_elf_gc_mark_hook (sec, info, rel, h, sym)
1748 asection *sec;
1749 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1750 Elf_Internal_Rela *rel;
1751 struct elf_link_hash_entry *h;
1752 Elf_Internal_Sym *sym;
1753{
1754 if (h != NULL)
1755 {
1756 switch (ELF64_R_TYPE (rel->r_info))
1757 {
1758 case R_MMIX_GNU_VTINHERIT:
1759 case R_MMIX_GNU_VTENTRY:
1760 break;
1761
1762 default:
1763 switch (h->root.type)
1764 {
1765 case bfd_link_hash_defined:
1766 case bfd_link_hash_defweak:
1767 return h->root.u.def.section;
1768
1769 case bfd_link_hash_common:
1770 return h->root.u.c.p->section;
1771
1772 default:
1773 break;
1774 }
1775 }
1776 }
1777 else
1778 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1779
1780 return NULL;
1781}
1782
1783/* Update relocation info for a GC-excluded section. We could supposedly
1784 perform the allocation after GC, but there's no suitable hook between
1785 GC (or section merge) and the point when all input sections must be
1786 present. Better to waste some memory and (perhaps) a little time. */
1787
1788static bfd_boolean
1789mmix_elf_gc_sweep_hook (abfd, info, sec, relocs)
1790 bfd *abfd ATTRIBUTE_UNUSED;
1791 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1792 asection *sec ATTRIBUTE_UNUSED;
1793 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
1794{
1795 struct bpo_reloc_section_info *bpodata
1796 = mmix_elf_section_data (sec)->bpo.reloc;
1797 asection *allocated_gregs_section;
1798
1799 /* If no bpodata here, we have nothing to do. */
1800 if (bpodata == NULL)
1801 return TRUE;
1802
1803 allocated_gregs_section = bpodata->bpo_greg_section;
1804
1805 mmix_elf_section_data (allocated_gregs_section)->bpo.greg->n_bpo_relocs
1806 -= bpodata->n_bpo_relocs_this_section;
1807
1808 return TRUE;
1809}
1810\f
1811/* Sort register relocs to come before expanding relocs. */
1812
1813static int
1814mmix_elf_sort_relocs (p1, p2)
1815 const PTR p1;
1816 const PTR p2;
1817{
1818 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1;
1819 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2;
1820 int r1_is_reg, r2_is_reg;
1821
1822 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive
1823 insns. */
1824 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3))
1825 return 1;
1826 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3))
1827 return -1;
1828
1829 r1_is_reg
1830 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE
1831 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG);
1832 r2_is_reg
1833 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE
1834 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG);
1835 if (r1_is_reg != r2_is_reg)
1836 return r2_is_reg - r1_is_reg;
1837
1838 /* Neither or both are register relocs. Then sort on full offset. */
1839 if (r1->r_offset > r2->r_offset)
1840 return 1;
1841 else if (r1->r_offset < r2->r_offset)
1842 return -1;
1843 return 0;
1844}
1845
1846/* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */
1847
1848static bfd_boolean
1849mmix_elf_check_common_relocs (abfd, info, sec, relocs)
1850 bfd *abfd;
1851 struct bfd_link_info *info;
1852 asection *sec;
1853 const Elf_Internal_Rela *relocs;
1854{
1855 bfd *bpo_greg_owner = NULL;
1856 asection *allocated_gregs_section = NULL;
1857 struct bpo_greg_section_info *gregdata = NULL;
1858 struct bpo_reloc_section_info *bpodata = NULL;
1859 const Elf_Internal_Rela *rel;
1860 const Elf_Internal_Rela *rel_end;
1861
1862 /* We currently have to abuse this COFF-specific member, since there's
1863 no target-machine-dedicated member. There's no alternative outside
1864 the bfd_link_info struct; we can't specialize a hash-table since
1865 they're different between ELF and mmo. */
1866 bpo_greg_owner = (bfd *) info->base_file;
1867
1868 rel_end = relocs + sec->reloc_count;
1869 for (rel = relocs; rel < rel_end; rel++)
1870 {
1871 switch (ELF64_R_TYPE (rel->r_info))
1872 {
1873 /* This relocation causes a GREG allocation. We need to count
1874 them, and we need to create a section for them, so we need an
1875 object to fake as the owner of that section. We can't use
1876 the ELF dynobj for this, since the ELF bits assume lots of
1877 DSO-related stuff if that member is non-NULL. */
1878 case R_MMIX_BASE_PLUS_OFFSET:
1879 /* We don't do anything with this reloc for a relocatable link. */
1880 if (info->relocatable)
1881 break;
1882
1883 if (bpo_greg_owner == NULL)
1884 {
1885 bpo_greg_owner = abfd;
1886 info->base_file = (PTR) bpo_greg_owner;
1887 }
1888
1889 if (allocated_gregs_section == NULL)
1890 allocated_gregs_section
1891 = bfd_get_section_by_name (bpo_greg_owner,
1892 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
1893
1894 if (allocated_gregs_section == NULL)
1895 {
1896 allocated_gregs_section
1897 = bfd_make_section (bpo_greg_owner,
1898 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
1899 /* Setting both SEC_ALLOC and SEC_LOAD means the section is
1900 treated like any other section, and we'd get errors for
1901 address overlap with the text section. Let's set none of
1902 those flags, as that is what currently happens for usual
1903 GREG allocations, and that works. */
1904 if (allocated_gregs_section == NULL
1905 || !bfd_set_section_flags (bpo_greg_owner,
1906 allocated_gregs_section,
1907 (SEC_HAS_CONTENTS
1908 | SEC_IN_MEMORY
1909 | SEC_LINKER_CREATED))
1910 || !bfd_set_section_alignment (bpo_greg_owner,
1911 allocated_gregs_section,
1912 3))
1913 return FALSE;
1914
1915 gregdata = (struct bpo_greg_section_info *)
1916 bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info));
1917 if (gregdata == NULL)
1918 return FALSE;
1919 mmix_elf_section_data (allocated_gregs_section)->bpo.greg
1920 = gregdata;
1921 }
1922 else if (gregdata == NULL)
1923 gregdata
1924 = mmix_elf_section_data (allocated_gregs_section)->bpo.greg;
1925
1926 /* Get ourselves some auxiliary info for the BPO-relocs. */
1927 if (bpodata == NULL)
1928 {
1929 /* No use doing a separate iteration pass to find the upper
1930 limit - just use the number of relocs. */
1931 bpodata = (struct bpo_reloc_section_info *)
1932 bfd_alloc (bpo_greg_owner,
1933 sizeof (struct bpo_reloc_section_info)
1934 * (sec->reloc_count + 1));
1935 if (bpodata == NULL)
1936 return FALSE;
1937 mmix_elf_section_data (sec)->bpo.reloc = bpodata;
1938 bpodata->first_base_plus_offset_reloc
1939 = bpodata->bpo_index
1940 = gregdata->n_max_bpo_relocs;
1941 bpodata->bpo_greg_section
1942 = allocated_gregs_section;
1943 bpodata->n_bpo_relocs_this_section = 0;
1944 }
1945
1946 bpodata->n_bpo_relocs_this_section++;
1947 gregdata->n_max_bpo_relocs++;
1948
1949 /* We don't get another chance to set this before GC; we've not
1950 set up any hook that runs before GC. */
1951 gregdata->n_bpo_relocs
1952 = gregdata->n_max_bpo_relocs;
1953 break;
1954
1955 case R_MMIX_PUSHJ_STUBBABLE:
1956 mmix_elf_section_data (sec)->pjs.n_pushj_relocs++;
1957 break;
1958 }
1959 }
1960
1961 /* Allocate per-reloc stub storage and initialize it to the max stub
1962 size. */
1963 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0)
1964 {
1965 size_t i;
1966
1967 mmix_elf_section_data (sec)->pjs.stub_size
1968 = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs
1969 * sizeof (mmix_elf_section_data (sec)
1970 ->pjs.stub_size[0]));
1971 if (mmix_elf_section_data (sec)->pjs.stub_size == NULL)
1972 return FALSE;
1973
1974 for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++)
1975 mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE;
1976 }
1977
1978 return TRUE;
1979}
1980
1981/* Look through the relocs for a section during the first phase. */
1982
1983static bfd_boolean
1984mmix_elf_check_relocs (abfd, info, sec, relocs)
1985 bfd *abfd;
1986 struct bfd_link_info *info;
1987 asection *sec;
1988 const Elf_Internal_Rela *relocs;
1989{
1990 Elf_Internal_Shdr *symtab_hdr;
1991 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
1992 const Elf_Internal_Rela *rel;
1993 const Elf_Internal_Rela *rel_end;
1994
1995 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1996 sym_hashes = elf_sym_hashes (abfd);
1997 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf64_External_Sym);
1998 if (!elf_bad_symtab (abfd))
1999 sym_hashes_end -= symtab_hdr->sh_info;
2000
2001 /* First we sort the relocs so that any register relocs come before
2002 expansion-relocs to the same insn. FIXME: Not done for mmo. */
2003 qsort ((PTR) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
2004 mmix_elf_sort_relocs);
2005
2006 /* Do the common part. */
2007 if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs))
2008 return FALSE;
2009
2010 if (info->relocatable)
2011 return TRUE;
2012
2013 rel_end = relocs + sec->reloc_count;
2014 for (rel = relocs; rel < rel_end; rel++)
2015 {
2016 struct elf_link_hash_entry *h;
2017 unsigned long r_symndx;
2018
2019 r_symndx = ELF64_R_SYM (rel->r_info);
2020 if (r_symndx < symtab_hdr->sh_info)
2021 h = NULL;
2022 else
2023 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2024
2025 switch (ELF64_R_TYPE (rel->r_info))
2026 {
2027 /* This relocation describes the C++ object vtable hierarchy.
2028 Reconstruct it for later use during GC. */
2029 case R_MMIX_GNU_VTINHERIT:
2030 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2031 return FALSE;
2032 break;
2033
2034 /* This relocation describes which C++ vtable entries are actually
2035 used. Record for later use during GC. */
2036 case R_MMIX_GNU_VTENTRY:
2037 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2038 return FALSE;
2039 break;
2040 }
2041 }
2042
2043 return TRUE;
2044}
2045
2046/* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo.
2047 Copied from elf_link_add_object_symbols. */
2048
2049bfd_boolean
2050_bfd_mmix_check_all_relocs (abfd, info)
2051 bfd *abfd;
2052 struct bfd_link_info *info;
2053{
2054 asection *o;
2055
2056 for (o = abfd->sections; o != NULL; o = o->next)
2057 {
2058 Elf_Internal_Rela *internal_relocs;
2059 bfd_boolean ok;
2060
2061 if ((o->flags & SEC_RELOC) == 0
2062 || o->reloc_count == 0
2063 || ((info->strip == strip_all || info->strip == strip_debugger)
2064 && (o->flags & SEC_DEBUGGING) != 0)
2065 || bfd_is_abs_section (o->output_section))
2066 continue;
2067
2068 internal_relocs
2069 = _bfd_elf_link_read_relocs (abfd, o, (PTR) NULL,
2070 (Elf_Internal_Rela *) NULL,
2071 info->keep_memory);
2072 if (internal_relocs == NULL)
2073 return FALSE;
2074
2075 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs);
2076
2077 if (! info->keep_memory)
2078 free (internal_relocs);
2079
2080 if (! ok)
2081 return FALSE;
2082 }
2083
2084 return TRUE;
2085}
2086\f
2087/* Change symbols relative to the reg contents section to instead be to
2088 the register section, and scale them down to correspond to the register
2089 number. */
2090
2091static bfd_boolean
2092mmix_elf_link_output_symbol_hook (info, name, sym, input_sec, h)
2093 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2094 const char *name ATTRIBUTE_UNUSED;
2095 Elf_Internal_Sym *sym;
2096 asection *input_sec;
2097 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED;
2098{
2099 if (input_sec != NULL
2100 && input_sec->name != NULL
2101 && ELF_ST_TYPE (sym->st_info) != STT_SECTION
2102 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0)
2103 {
2104 sym->st_value /= 8;
2105 sym->st_shndx = SHN_REGISTER;
2106 }
2107
2108 return TRUE;
2109}
2110
2111/* We fake a register section that holds values that are register numbers.
2112 Having a SHN_REGISTER and register section translates better to other
2113 formats (e.g. mmo) than for example a STT_REGISTER attribute.
2114 This section faking is based on a construct in elf32-mips.c. */
2115static asection mmix_elf_reg_section;
2116static asymbol mmix_elf_reg_section_symbol;
2117static asymbol *mmix_elf_reg_section_symbol_ptr;
2118
2119/* Handle the special section numbers that a symbol may use. */
2120
2121void
2122mmix_elf_symbol_processing (abfd, asym)
2123 bfd *abfd ATTRIBUTE_UNUSED;
2124 asymbol *asym;
2125{
2126 elf_symbol_type *elfsym;
2127
2128 elfsym = (elf_symbol_type *) asym;
2129 switch (elfsym->internal_elf_sym.st_shndx)
2130 {
2131 case SHN_REGISTER:
2132 if (mmix_elf_reg_section.name == NULL)
2133 {
2134 /* Initialize the register section. */
2135 mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME;
2136 mmix_elf_reg_section.flags = SEC_NO_FLAGS;
2137 mmix_elf_reg_section.output_section = &mmix_elf_reg_section;
2138 mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol;
2139 mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr;
2140 mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME;
2141 mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM;
2142 mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section;
2143 mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol;
2144 }
2145 asym->section = &mmix_elf_reg_section;
2146 break;
2147
2148 default:
2149 break;
2150 }
2151}
2152
2153/* Given a BFD section, try to locate the corresponding ELF section
2154 index. */
2155
2156static bfd_boolean
2157mmix_elf_section_from_bfd_section (abfd, sec, retval)
2158 bfd * abfd ATTRIBUTE_UNUSED;
2159 asection * sec;
2160 int * retval;
2161{
2162 if (strcmp (bfd_get_section_name (abfd, sec), MMIX_REG_SECTION_NAME) == 0)
2163 *retval = SHN_REGISTER;
2164 else
2165 return FALSE;
2166
2167 return TRUE;
2168}
2169
2170/* Hook called by the linker routine which adds symbols from an object
2171 file. We must handle the special SHN_REGISTER section number here.
2172
2173 We also check that we only have *one* each of the section-start
2174 symbols, since otherwise having two with the same value would cause
2175 them to be "merged", but with the contents serialized. */
2176
2177bfd_boolean
2178mmix_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp)
2179 bfd *abfd;
2180 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2181 Elf_Internal_Sym *sym;
2182 const char **namep ATTRIBUTE_UNUSED;
2183 flagword *flagsp ATTRIBUTE_UNUSED;
2184 asection **secp;
2185 bfd_vma *valp ATTRIBUTE_UNUSED;
2186{
2187 if (sym->st_shndx == SHN_REGISTER)
2188 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME);
2189 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.'
2190 && strncmp (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX,
2191 strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) == 0)
2192 {
2193 /* See if we have another one. */
2194 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash,
2195 *namep,
2196 FALSE,
2197 FALSE,
2198 FALSE);
2199
2200 if (h != NULL && h->type != bfd_link_hash_undefined)
2201 {
2202 /* How do we get the asymbol (or really: the filename) from h?
2203 h->u.def.section->owner is NULL. */
2204 ((*_bfd_error_handler)
2205 (_("%s: Error: multiple definition of `%s'; start of %s is set in a earlier linked file\n"),
2206 bfd_get_filename (abfd), *namep,
2207 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)));
2208 bfd_set_error (bfd_error_bad_value);
2209 return FALSE;
2210 }
2211 }
2212
2213 return TRUE;
2214}
2215
2216/* We consider symbols matching "L.*:[0-9]+" to be local symbols. */
2217
2218bfd_boolean
2219mmix_elf_is_local_label_name (abfd, name)
2220 bfd *abfd;
2221 const char *name;
2222{
2223 const char *colpos;
2224 int digits;
2225
2226 /* Also include the default local-label definition. */
2227 if (_bfd_elf_is_local_label_name (abfd, name))
2228 return TRUE;
2229
2230 if (*name != 'L')
2231 return FALSE;
2232
2233 /* If there's no ":", or more than one, it's not a local symbol. */
2234 colpos = strchr (name, ':');
2235 if (colpos == NULL || strchr (colpos + 1, ':') != NULL)
2236 return FALSE;
2237
2238 /* Check that there are remaining characters and that they are digits. */
2239 if (colpos[1] == 0)
2240 return FALSE;
2241
2242 digits = strspn (colpos + 1, "0123456789");
2243 return digits != 0 && colpos[1 + digits] == 0;
2244}
2245
2246/* We get rid of the register section here. */
2247
2248bfd_boolean
2249mmix_elf_final_link (abfd, info)
2250 bfd *abfd;
2251 struct bfd_link_info *info;
2252{
2253 /* We never output a register section, though we create one for
2254 temporary measures. Check that nobody entered contents into it. */
2255 asection *reg_section;
2256 asection **secpp;
2257
2258 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME);
2259
2260 if (reg_section != NULL)
2261 {
2262 /* FIXME: Pass error state gracefully. */
2263 if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS)
2264 _bfd_abort (__FILE__, __LINE__, _("Register section has contents\n"));
2265
2266 /* Really remove the section. */
2267 for (secpp = &abfd->sections;
2268 *secpp != reg_section;
2269 secpp = &(*secpp)->next)
2270 ;
2271 bfd_section_list_remove (abfd, secpp);
2272 --abfd->section_count;
2273 }
2274
2275 if (! bfd_elf_final_link (abfd, info))
2276 return FALSE;
2277
2278 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by
2279 the regular linker machinery. We do it here, like other targets with
2280 special sections. */
2281 if (info->base_file != NULL)
2282 {
2283 asection *greg_section
2284 = bfd_get_section_by_name ((bfd *) info->base_file,
2285 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2286 if (!bfd_set_section_contents (abfd,
2287 greg_section->output_section,
2288 greg_section->contents,
2289 (file_ptr) greg_section->output_offset,
2290 greg_section->size))
2291 return FALSE;
2292 }
2293 return TRUE;
2294}
2295
2296/* We need to include the maximum size of PUSHJ-stubs in the initial
2297 section size. This is expected to shrink during linker relaxation. */
2298
2299static void
2300mmix_set_relaxable_size (abfd, sec, ptr)
2301 bfd *abfd ATTRIBUTE_UNUSED;
2302 asection *sec;
2303 void *ptr;
2304{
2305 struct bfd_link_info *info = ptr;
2306
2307 /* Make sure we only do this for section where we know we want this,
2308 otherwise we might end up resetting the size of COMMONs. */
2309 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)
2310 return;
2311
2312 sec->rawsize = sec->size;
2313 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs
2314 * MAX_PUSHJ_STUB_SIZE);
2315
2316 /* For use in relocatable link, we start with a max stubs size. See
2317 mmix_elf_relax_section. */
2318 if (info->relocatable && sec->output_section)
2319 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum
2320 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs
2321 * MAX_PUSHJ_STUB_SIZE);
2322}
2323
2324/* Initialize stuff for the linker-generated GREGs to match
2325 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */
2326
2327bfd_boolean
2328_bfd_mmix_before_linker_allocation (abfd, info)
2329 bfd *abfd ATTRIBUTE_UNUSED;
2330 struct bfd_link_info *info;
2331{
2332 asection *bpo_gregs_section;
2333 bfd *bpo_greg_owner;
2334 struct bpo_greg_section_info *gregdata;
2335 size_t n_gregs;
2336 bfd_vma gregs_size;
2337 size_t i;
2338 size_t *bpo_reloc_indexes;
2339 bfd *ibfd;
2340
2341 /* Set the initial size of sections. */
2342 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2343 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info);
2344
2345 /* The bpo_greg_owner bfd is supposed to have been set by
2346 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen.
2347 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */
2348 bpo_greg_owner = (bfd *) info->base_file;
2349 if (bpo_greg_owner == NULL)
2350 return TRUE;
2351
2352 bpo_gregs_section
2353 = bfd_get_section_by_name (bpo_greg_owner,
2354 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2355
2356 if (bpo_gregs_section == NULL)
2357 return TRUE;
2358
2359 /* We use the target-data handle in the ELF section data. */
2360 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
2361 if (gregdata == NULL)
2362 return FALSE;
2363
2364 n_gregs = gregdata->n_bpo_relocs;
2365 gregdata->n_allocated_bpo_gregs = n_gregs;
2366
2367 /* When this reaches zero during relaxation, all entries have been
2368 filled in and the size of the linker gregs can be calculated. */
2369 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs;
2370
2371 /* Set the zeroth-order estimate for the GREGs size. */
2372 gregs_size = n_gregs * 8;
2373
2374 if (!bfd_set_section_size (bpo_greg_owner, bpo_gregs_section, gregs_size))
2375 return FALSE;
2376
2377 /* Allocate and set up the GREG arrays. They're filled in at relaxation
2378 time. Note that we must use the max number ever noted for the array,
2379 since the index numbers were created before GC. */
2380 gregdata->reloc_request
2381 = bfd_zalloc (bpo_greg_owner,
2382 sizeof (struct bpo_reloc_request)
2383 * gregdata->n_max_bpo_relocs);
2384
2385 gregdata->bpo_reloc_indexes
2386 = bpo_reloc_indexes
2387 = bfd_alloc (bpo_greg_owner,
2388 gregdata->n_max_bpo_relocs
2389 * sizeof (size_t));
2390 if (bpo_reloc_indexes == NULL)
2391 return FALSE;
2392
2393 /* The default order is an identity mapping. */
2394 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2395 {
2396 bpo_reloc_indexes[i] = i;
2397 gregdata->reloc_request[i].bpo_reloc_no = i;
2398 }
2399
2400 return TRUE;
2401}
2402\f
2403/* Fill in contents in the linker allocated gregs. Everything is
2404 calculated at this point; we just move the contents into place here. */
2405
2406bfd_boolean
2407_bfd_mmix_after_linker_allocation (abfd, link_info)
2408 bfd *abfd ATTRIBUTE_UNUSED;
2409 struct bfd_link_info *link_info;
2410{
2411 asection *bpo_gregs_section;
2412 bfd *bpo_greg_owner;
2413 struct bpo_greg_section_info *gregdata;
2414 size_t n_gregs;
2415 size_t i, j;
2416 size_t lastreg;
2417 bfd_byte *contents;
2418
2419 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs
2420 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such
2421 object, there was no R_MMIX_BASE_PLUS_OFFSET. */
2422 bpo_greg_owner = (bfd *) link_info->base_file;
2423 if (bpo_greg_owner == NULL)
2424 return TRUE;
2425
2426 bpo_gregs_section
2427 = bfd_get_section_by_name (bpo_greg_owner,
2428 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2429
2430 /* This can't happen without DSO handling. When DSOs are handled
2431 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such
2432 section. */
2433 if (bpo_gregs_section == NULL)
2434 return TRUE;
2435
2436 /* We use the target-data handle in the ELF section data. */
2437
2438 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
2439 if (gregdata == NULL)
2440 return FALSE;
2441
2442 n_gregs = gregdata->n_allocated_bpo_gregs;
2443
2444 bpo_gregs_section->contents
2445 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size);
2446 if (contents == NULL)
2447 return FALSE;
2448
2449 /* Sanity check: If these numbers mismatch, some relocation has not been
2450 accounted for and the rest of gregdata is probably inconsistent.
2451 It's a bug, but it's more helpful to identify it than segfaulting
2452 below. */
2453 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round
2454 != gregdata->n_bpo_relocs)
2455 {
2456 (*_bfd_error_handler)
2457 (_("Internal inconsistency: remaining %u != max %u.\n\
2458 Please report this bug."),
2459 gregdata->n_remaining_bpo_relocs_this_relaxation_round,
2460 gregdata->n_bpo_relocs);
2461 return FALSE;
2462 }
2463
2464 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++)
2465 if (gregdata->reloc_request[i].regindex != lastreg)
2466 {
2467 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value,
2468 contents + j * 8);
2469 lastreg = gregdata->reloc_request[i].regindex;
2470 j++;
2471 }
2472
2473 return TRUE;
2474}
2475
2476/* Sort valid relocs to come before non-valid relocs, then on increasing
2477 value. */
2478
2479static int
2480bpo_reloc_request_sort_fn (p1, p2)
2481 const PTR p1;
2482 const PTR p2;
2483{
2484 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1;
2485 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2;
2486
2487 /* Primary function is validity; non-valid relocs sorted after valid
2488 ones. */
2489 if (r1->valid != r2->valid)
2490 return r2->valid - r1->valid;
2491
2492 /* Then sort on value. Don't simplify and return just the difference of
2493 the values: the upper bits of the 64-bit value would be truncated on
2494 a host with 32-bit ints. */
2495 if (r1->value != r2->value)
2496 return r1->value > r2->value ? 1 : -1;
2497
2498 /* As a last re-sort, use the relocation number, so we get a stable
2499 sort. The *addresses* aren't stable since items are swapped during
2500 sorting. It depends on the qsort implementation if this actually
2501 happens. */
2502 return r1->bpo_reloc_no > r2->bpo_reloc_no
2503 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0);
2504}
2505
2506/* For debug use only. Dumps the global register allocations resulting
2507 from base-plus-offset relocs. */
2508
2509void
2510mmix_dump_bpo_gregs (link_info, pf)
2511 struct bfd_link_info *link_info;
2512 bfd_error_handler_type pf;
2513{
2514 bfd *bpo_greg_owner;
2515 asection *bpo_gregs_section;
2516 struct bpo_greg_section_info *gregdata;
2517 unsigned int i;
2518
2519 if (link_info == NULL || link_info->base_file == NULL)
2520 return;
2521
2522 bpo_greg_owner = (bfd *) link_info->base_file;
2523
2524 bpo_gregs_section
2525 = bfd_get_section_by_name (bpo_greg_owner,
2526 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2527
2528 if (bpo_gregs_section == NULL)
2529 return;
2530
2531 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
2532 if (gregdata == NULL)
2533 return;
2534
2535 if (pf == NULL)
2536 pf = _bfd_error_handler;
2537
2538 /* These format strings are not translated. They are for debug purposes
2539 only and never displayed to an end user. Should they escape, we
2540 surely want them in original. */
2541 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\
2542 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs,
2543 gregdata->n_max_bpo_relocs,
2544 gregdata->n_remaining_bpo_relocs_this_relaxation_round,
2545 gregdata->n_allocated_bpo_gregs);
2546
2547 if (gregdata->reloc_request)
2548 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2549 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n",
2550 i,
2551 (gregdata->bpo_reloc_indexes != NULL
2552 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1),
2553 gregdata->reloc_request[i].bpo_reloc_no,
2554 gregdata->reloc_request[i].valid,
2555
2556 (unsigned long) (gregdata->reloc_request[i].value >> 32),
2557 (unsigned long) gregdata->reloc_request[i].value,
2558 gregdata->reloc_request[i].regindex,
2559 gregdata->reloc_request[i].offset);
2560}
2561
2562/* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and
2563 when the last such reloc is done, an index-array is sorted according to
2564 the values and iterated over to produce register numbers (indexed by 0
2565 from the first allocated register number) and offsets for use in real
2566 relocation.
2567
2568 PUSHJ stub accounting is also done here.
2569
2570 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
2571
2572static bfd_boolean
2573mmix_elf_relax_section (abfd, sec, link_info, again)
2574 bfd *abfd;
2575 asection *sec;
2576 struct bfd_link_info *link_info;
2577 bfd_boolean *again;
2578{
2579 Elf_Internal_Shdr *symtab_hdr;
2580 Elf_Internal_Rela *internal_relocs;
2581 Elf_Internal_Rela *irel, *irelend;
2582 asection *bpo_gregs_section = NULL;
2583 struct bpo_greg_section_info *gregdata;
2584 struct bpo_reloc_section_info *bpodata
2585 = mmix_elf_section_data (sec)->bpo.reloc;
2586 /* The initialization is to quiet compiler warnings. The value is to
2587 spot a missing actual initialization. */
2588 size_t bpono = (size_t) -1;
2589 size_t pjsno = 0;
2590 bfd *bpo_greg_owner;
2591 Elf_Internal_Sym *isymbuf = NULL;
2592 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size;
2593
2594 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0;
2595
2596 /* Assume nothing changes. */
2597 *again = FALSE;
2598
2599 /* We don't have to do anything if this section does not have relocs, or
2600 if this is not a code section. */
2601 if ((sec->flags & SEC_RELOC) == 0
2602 || sec->reloc_count == 0
2603 || (sec->flags & SEC_CODE) == 0
2604 || (sec->flags & SEC_LINKER_CREATED) != 0
2605 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs,
2606 then nothing to do. */
2607 || (bpodata == NULL
2608 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0))
2609 return TRUE;
2610
2611 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2612
2613 bpo_greg_owner = (bfd *) link_info->base_file;
2614
2615 if (bpodata != NULL)
2616 {
2617 bpo_gregs_section = bpodata->bpo_greg_section;
2618 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
2619 bpono = bpodata->first_base_plus_offset_reloc;
2620 }
2621 else
2622 gregdata = NULL;
2623
2624 /* Get a copy of the native relocations. */
2625 internal_relocs
2626 = _bfd_elf_link_read_relocs (abfd, sec, (PTR) NULL,
2627 (Elf_Internal_Rela *) NULL,
2628 link_info->keep_memory);
2629 if (internal_relocs == NULL)
2630 goto error_return;
2631
2632 /* Walk through them looking for relaxing opportunities. */
2633 irelend = internal_relocs + sec->reloc_count;
2634 for (irel = internal_relocs; irel < irelend; irel++)
2635 {
2636 bfd_vma symval;
2637 struct elf_link_hash_entry *h = NULL;
2638
2639 /* We only process two relocs. */
2640 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET
2641 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE)
2642 continue;
2643
2644 /* We process relocs in a distinctly different way when this is a
2645 relocatable link (for one, we don't look at symbols), so we avoid
2646 mixing its code with that for the "normal" relaxation. */
2647 if (link_info->relocatable)
2648 {
2649 /* The only transformation in a relocatable link is to generate
2650 a full stub at the location of the stub calculated for the
2651 input section, if the relocated stub location, the end of the
2652 output section plus earlier stubs, cannot be reached. Thus
2653 relocatable linking can only lead to worse code, but it still
2654 works. */
2655 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE)
2656 {
2657 /* If we can reach the end of the output-section and beyond
2658 any current stubs, then we don't need a stub for this
2659 reloc. The relaxed order of output stub allocation may
2660 not exactly match the straightforward order, so we always
2661 assume presence of output stubs, which will allow
2662 relaxation only on relocations indifferent to the
2663 presence of output stub allocations for other relocations
2664 and thus the order of output stub allocation. */
2665 if (bfd_check_overflow (complain_overflow_signed,
2666 19,
2667 0,
2668 bfd_arch_bits_per_address (abfd),
2669 /* Output-stub location. */
2670 sec->output_section->rawsize
2671 + (mmix_elf_section_data (sec
2672 ->output_section)
2673 ->pjs.stubs_size_sum)
2674 /* Location of this PUSHJ reloc. */
2675 - (sec->output_offset + irel->r_offset)
2676 /* Don't count *this* stub twice. */
2677 - (mmix_elf_section_data (sec)
2678 ->pjs.stub_size[pjsno]
2679 + MAX_PUSHJ_STUB_SIZE))
2680 == bfd_reloc_ok)
2681 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0;
2682
2683 mmix_elf_section_data (sec)->pjs.stubs_size_sum
2684 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno];
2685
2686 pjsno++;
2687 }
2688
2689 continue;
2690 }
2691
2692 /* Get the value of the symbol referred to by the reloc. */
2693 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2694 {
2695 /* A local symbol. */
2696 Elf_Internal_Sym *isym;
2697 asection *sym_sec;
2698
2699 /* Read this BFD's local symbols if we haven't already. */
2700 if (isymbuf == NULL)
2701 {
2702 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2703 if (isymbuf == NULL)
2704 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2705 symtab_hdr->sh_info, 0,
2706 NULL, NULL, NULL);
2707 if (isymbuf == 0)
2708 goto error_return;
2709 }
2710
2711 isym = isymbuf + ELF64_R_SYM (irel->r_info);
2712 if (isym->st_shndx == SHN_UNDEF)
2713 sym_sec = bfd_und_section_ptr;
2714 else if (isym->st_shndx == SHN_ABS)
2715 sym_sec = bfd_abs_section_ptr;
2716 else if (isym->st_shndx == SHN_COMMON)
2717 sym_sec = bfd_com_section_ptr;
2718 else
2719 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2720 symval = (isym->st_value
2721 + sym_sec->output_section->vma
2722 + sym_sec->output_offset);
2723 }
2724 else
2725 {
2726 unsigned long indx;
2727
2728 /* An external symbol. */
2729 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2730 h = elf_sym_hashes (abfd)[indx];
2731 BFD_ASSERT (h != NULL);
2732 if (h->root.type != bfd_link_hash_defined
2733 && h->root.type != bfd_link_hash_defweak)
2734 {
2735 /* This appears to be a reference to an undefined symbol. Just
2736 ignore it--it will be caught by the regular reloc processing.
2737 We need to keep BPO reloc accounting consistent, though
2738 else we'll abort instead of emitting an error message. */
2739 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET
2740 && gregdata != NULL)
2741 {
2742 gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
2743 bpono++;
2744 }
2745 continue;
2746 }
2747
2748 symval = (h->root.u.def.value
2749 + h->root.u.def.section->output_section->vma
2750 + h->root.u.def.section->output_offset);
2751 }
2752
2753 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE)
2754 {
2755 bfd_vma value = symval + irel->r_addend;
2756 bfd_vma dot
2757 = (sec->output_section->vma
2758 + sec->output_offset
2759 + irel->r_offset);
2760 bfd_vma stubaddr
2761 = (sec->output_section->vma
2762 + sec->output_offset
2763 + size
2764 + mmix_elf_section_data (sec)->pjs.stubs_size_sum);
2765
2766 if ((value & 3) == 0
2767 && bfd_check_overflow (complain_overflow_signed,
2768 19,
2769 0,
2770 bfd_arch_bits_per_address (abfd),
2771 value - dot
2772 - (value > dot
2773 ? mmix_elf_section_data (sec)
2774 ->pjs.stub_size[pjsno]
2775 : 0))
2776 == bfd_reloc_ok)
2777 /* If the reloc fits, no stub is needed. */
2778 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0;
2779 else
2780 /* Maybe we can get away with just a JMP insn? */
2781 if ((value & 3) == 0
2782 && bfd_check_overflow (complain_overflow_signed,
2783 27,
2784 0,
2785 bfd_arch_bits_per_address (abfd),
2786 value - stubaddr
2787 - (value > dot
2788 ? mmix_elf_section_data (sec)
2789 ->pjs.stub_size[pjsno] - 4
2790 : 0))
2791 == bfd_reloc_ok)
2792 /* Yep, account for a stub consisting of a single JMP insn. */
2793 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4;
2794 else
2795 /* Nope, go for the full insn stub. It doesn't seem useful to
2796 emit the intermediate sizes; those will only be useful for
2797 a >64M program assuming contiguous code. */
2798 mmix_elf_section_data (sec)->pjs.stub_size[pjsno]
2799 = MAX_PUSHJ_STUB_SIZE;
2800
2801 mmix_elf_section_data (sec)->pjs.stubs_size_sum
2802 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno];
2803 pjsno++;
2804 continue;
2805 }
2806
2807 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */
2808
2809 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value
2810 = symval + irel->r_addend;
2811 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE;
2812 gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
2813 }
2814
2815 /* Check if that was the last BPO-reloc. If so, sort the values and
2816 calculate how many registers we need to cover them. Set the size of
2817 the linker gregs, and if the number of registers changed, indicate
2818 that we need to relax some more because we have more work to do. */
2819 if (gregdata != NULL
2820 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0)
2821 {
2822 size_t i;
2823 bfd_vma prev_base;
2824 size_t regindex;
2825
2826 /* First, reset the remaining relocs for the next round. */
2827 gregdata->n_remaining_bpo_relocs_this_relaxation_round
2828 = gregdata->n_bpo_relocs;
2829
2830 qsort ((PTR) gregdata->reloc_request,
2831 gregdata->n_max_bpo_relocs,
2832 sizeof (struct bpo_reloc_request),
2833 bpo_reloc_request_sort_fn);
2834
2835 /* Recalculate indexes. When we find a change (however unlikely
2836 after the initial iteration), we know we need to relax again,
2837 since items in the GREG-array are sorted by increasing value and
2838 stored in the relaxation phase. */
2839 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2840 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
2841 != i)
2842 {
2843 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
2844 = i;
2845 *again = TRUE;
2846 }
2847
2848 /* Allocate register numbers (indexing from 0). Stop at the first
2849 non-valid reloc. */
2850 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value;
2851 i < gregdata->n_bpo_relocs;
2852 i++)
2853 {
2854 if (gregdata->reloc_request[i].value > prev_base + 255)
2855 {
2856 regindex++;
2857 prev_base = gregdata->reloc_request[i].value;
2858 }
2859 gregdata->reloc_request[i].regindex = regindex;
2860 gregdata->reloc_request[i].offset
2861 = gregdata->reloc_request[i].value - prev_base;
2862 }
2863
2864 /* If it's not the same as the last time, we need to relax again,
2865 because the size of the section has changed. I'm not sure we
2866 actually need to do any adjustments since the shrinking happens
2867 at the start of this section, but better safe than sorry. */
2868 if (gregdata->n_allocated_bpo_gregs != regindex + 1)
2869 {
2870 gregdata->n_allocated_bpo_gregs = regindex + 1;
2871 *again = TRUE;
2872 }
2873
2874 bpo_gregs_section->size = (regindex + 1) * 8;
2875 }
2876
2877 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
2878 {
2879 if (! link_info->keep_memory)
2880 free (isymbuf);
2881 else
2882 {
2883 /* Cache the symbols for elf_link_input_bfd. */
2884 symtab_hdr->contents = (unsigned char *) isymbuf;
2885 }
2886 }
2887
2888 if (internal_relocs != NULL
2889 && elf_section_data (sec)->relocs != internal_relocs)
2890 free (internal_relocs);
2891
2892 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum)
2893 abort ();
2894
2895 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum)
2896 {
2897 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum;
2898 *again = TRUE;
2899 }
2900
2901 return TRUE;
2902
2903 error_return:
2904 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
2905 free (isymbuf);
2906 if (internal_relocs != NULL
2907 && elf_section_data (sec)->relocs != internal_relocs)
2908 free (internal_relocs);
2909 return FALSE;
2910}
2911\f
2912#define ELF_ARCH bfd_arch_mmix
2913#define ELF_MACHINE_CODE EM_MMIX
2914
2915/* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL).
2916 However, that's too much for something somewhere in the linker part of
2917 BFD; perhaps the start-address has to be a non-zero multiple of this
2918 number, or larger than this number. The symptom is that the linker
2919 complains: "warning: allocated section `.text' not in segment". We
2920 settle for 64k; the page-size used in examples is 8k.
2921 #define ELF_MAXPAGESIZE 0x10000
2922
2923 Unfortunately, this causes excessive padding in the supposedly small
2924 for-education programs that are the expected usage (where people would
2925 inspect output). We stick to 256 bytes just to have *some* default
2926 alignment. */
2927#define ELF_MAXPAGESIZE 0x100
2928
2929#define TARGET_BIG_SYM bfd_elf64_mmix_vec
2930#define TARGET_BIG_NAME "elf64-mmix"
2931
2932#define elf_info_to_howto_rel NULL
2933#define elf_info_to_howto mmix_info_to_howto_rela
2934#define elf_backend_relocate_section mmix_elf_relocate_section
2935#define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook
2936#define elf_backend_gc_sweep_hook mmix_elf_gc_sweep_hook
2937
2938#define elf_backend_link_output_symbol_hook \
2939 mmix_elf_link_output_symbol_hook
2940#define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook
2941
2942#define elf_backend_check_relocs mmix_elf_check_relocs
2943#define elf_backend_symbol_processing mmix_elf_symbol_processing
2944
2945#define bfd_elf64_bfd_is_local_label_name \
2946 mmix_elf_is_local_label_name
2947
2948#define elf_backend_may_use_rel_p 0
2949#define elf_backend_may_use_rela_p 1
2950#define elf_backend_default_use_rela_p 1
2951
2952#define elf_backend_can_gc_sections 1
2953#define elf_backend_section_from_bfd_section \
2954 mmix_elf_section_from_bfd_section
2955
2956#define bfd_elf64_new_section_hook mmix_elf_new_section_hook
2957#define bfd_elf64_bfd_final_link mmix_elf_final_link
2958#define bfd_elf64_bfd_relax_section mmix_elf_relax_section
2959
2960#include "elf64-target.h"
GDB Binutils - Deliverables
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