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Sync bootstrap-lto.mk and dfp.m4 with gcc.
[binutils.git] / bfd / elf64-mmix.c
blob3ac4950b5b2d4b912d236fb10479af274263c30d
1 /* MMIX-specific support for 64-bit ELF.
2 Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Hans-Peter Nilsson <hp@bitrange.com>
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23
24 /* No specific ABI or "processor-specific supplement" defined. */
25
26 /* TODO:
27 - "Traditional" linker relaxation (shrinking whole sections).
28 - Merge reloc stubs jumping to same location.
29 - GETA stub relaxation (call a stub for out of range new
30 R_MMIX_GETA_STUBBABLE). */
31
32 #include "sysdep.h"
33 #include "bfd.h"
34 #include "libbfd.h"
35 #include "elf-bfd.h"
36 #include "elf/mmix.h"
37 #include "opcode/mmix.h"
38
39 #define MINUS_ONE (((bfd_vma) 0) - 1)
40
41 #define MAX_PUSHJ_STUB_SIZE (5 * 4)
42
43 /* Put these everywhere in new code. */
44 #define FATAL_DEBUG \
45 _bfd_abort (__FILE__, __LINE__, \
46 "Internal: Non-debugged code (test-case missing)")
47
48 #define BAD_CASE(x) \
49 _bfd_abort (__FILE__, __LINE__, \
50 "bad case for " #x)
51
52 struct _mmix_elf_section_data
53 {
54 struct bfd_elf_section_data elf;
55 union
56 {
57 struct bpo_reloc_section_info *reloc;
58 struct bpo_greg_section_info *greg;
59 } bpo;
60
61 struct pushj_stub_info
62 {
63 /* Maximum number of stubs needed for this section. */
64 bfd_size_type n_pushj_relocs;
65
66 /* Size of stubs after a mmix_elf_relax_section round. */
67 bfd_size_type stubs_size_sum;
68
69 /* Per-reloc stubs_size_sum information. The stubs_size_sum member is the sum
70 of these. Allocated in mmix_elf_check_common_relocs. */
71 bfd_size_type *stub_size;
72
73 /* Offset of next stub during relocation. Somewhat redundant with the
74 above: error coverage is easier and we don't have to reset the
75 stubs_size_sum for relocation. */
76 bfd_size_type stub_offset;
77 } pjs;
78 };
79
80 #define mmix_elf_section_data(sec) \
81 ((struct _mmix_elf_section_data *) elf_section_data (sec))
82
83 /* For each section containing a base-plus-offset (BPO) reloc, we attach
84 this struct as mmix_elf_section_data (section)->bpo, which is otherwise
85 NULL. */
86 struct bpo_reloc_section_info
87 {
88 /* The base is 1; this is the first number in this section. */
89 size_t first_base_plus_offset_reloc;
90
91 /* Number of BPO-relocs in this section. */
92 size_t n_bpo_relocs_this_section;
93
94 /* Running index, used at relocation time. */
95 size_t bpo_index;
96
97 /* We don't have access to the bfd_link_info struct in
98 mmix_final_link_relocate. What we really want to get at is the
99 global single struct greg_relocation, so we stash it here. */
100 asection *bpo_greg_section;
101 };
102
103 /* Helper struct (in global context) for the one below.
104 There's one of these created for every BPO reloc. */
105 struct bpo_reloc_request
106 {
107 bfd_vma value;
108
109 /* Valid after relaxation. The base is 0; the first register number
110 must be added. The offset is in range 0..255. */
111 size_t regindex;
112 size_t offset;
113
114 /* The order number for this BPO reloc, corresponding to the order in
115 which BPO relocs were found. Used to create an index after reloc
116 requests are sorted. */
117 size_t bpo_reloc_no;
118
119 /* Set when the value is computed. Better than coding "guard values"
120 into the other members. Is FALSE only for BPO relocs in a GC:ed
121 section. */
122 bfd_boolean valid;
123 };
124
125 /* We attach this as mmix_elf_section_data (sec)->bpo in the linker-allocated
126 greg contents section (MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME),
127 which is linked into the register contents section
128 (MMIX_REG_CONTENTS_SECTION_NAME). This section is created by the
129 linker; using the same hook as for usual with BPO relocs does not
130 collide. */
131 struct bpo_greg_section_info
132 {
133 /* After GC, this reflects the number of remaining, non-excluded
134 BPO-relocs. */
135 size_t n_bpo_relocs;
136
137 /* This is the number of allocated bpo_reloc_requests; the size of
138 sorted_indexes. Valid after the check.*relocs functions are called
139 for all incoming sections. It includes the number of BPO relocs in
140 sections that were GC:ed. */
141 size_t n_max_bpo_relocs;
142
143 /* A counter used to find out when to fold the BPO gregs, since we
144 don't have a single "after-relaxation" hook. */
145 size_t n_remaining_bpo_relocs_this_relaxation_round;
146
147 /* The number of linker-allocated GREGs resulting from BPO relocs.
148 This is an approximation after _bfd_mmix_before_linker_allocation
149 and supposedly accurate after mmix_elf_relax_section is called for
150 all incoming non-collected sections. */
151 size_t n_allocated_bpo_gregs;
152
153 /* Index into reloc_request[], sorted on increasing "value", secondary
154 by increasing index for strict sorting order. */
155 size_t *bpo_reloc_indexes;
156
157 /* An array of all relocations, with the "value" member filled in by
158 the relaxation function. */
159 struct bpo_reloc_request *reloc_request;
160 };
161
162 static int mmix_elf_link_output_symbol_hook
163 PARAMS ((struct bfd_link_info *, const char *, Elf_Internal_Sym *,
164 asection *, struct elf_link_hash_entry *));
165
166 static bfd_reloc_status_type mmix_elf_reloc
167 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
168
169 static reloc_howto_type *bfd_elf64_bfd_reloc_type_lookup
170 PARAMS ((bfd *, bfd_reloc_code_real_type));
171
172 static void mmix_info_to_howto_rela
173 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
174
175 static int mmix_elf_sort_relocs PARAMS ((const PTR, const PTR));
176
177 static bfd_boolean mmix_elf_new_section_hook
178 PARAMS ((bfd *, asection *));
179
180 static bfd_boolean mmix_elf_check_relocs
181 PARAMS ((bfd *, struct bfd_link_info *, asection *,
182 const Elf_Internal_Rela *));
183
184 static bfd_boolean mmix_elf_check_common_relocs
185 PARAMS ((bfd *, struct bfd_link_info *, asection *,
186 const Elf_Internal_Rela *));
187
188 static bfd_boolean mmix_elf_relocate_section
189 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
190 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
191
192 static bfd_reloc_status_type mmix_final_link_relocate
193 PARAMS ((reloc_howto_type *, asection *, bfd_byte *,
194 bfd_vma, bfd_signed_vma, bfd_vma, const char *, asection *));
195
196 static bfd_reloc_status_type mmix_elf_perform_relocation
197 PARAMS ((asection *, reloc_howto_type *, PTR, bfd_vma, bfd_vma));
198
199 static bfd_boolean mmix_elf_section_from_bfd_section
200 PARAMS ((bfd *, asection *, int *));
201
202 static bfd_boolean mmix_elf_add_symbol_hook
203 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Sym *,
204 const char **, flagword *, asection **, bfd_vma *));
205
206 static bfd_boolean mmix_elf_is_local_label_name
207 PARAMS ((bfd *, const char *));
208
209 static int bpo_reloc_request_sort_fn PARAMS ((const PTR, const PTR));
210
211 static bfd_boolean mmix_elf_relax_section
212 PARAMS ((bfd *abfd, asection *sec, struct bfd_link_info *link_info,
213 bfd_boolean *again));
214
215 extern bfd_boolean mmix_elf_final_link PARAMS ((bfd *, struct bfd_link_info *));
216
217 extern void mmix_elf_symbol_processing PARAMS ((bfd *, asymbol *));
218
219 /* Only intended to be called from a debugger. */
220 extern void mmix_dump_bpo_gregs
221 PARAMS ((struct bfd_link_info *, bfd_error_handler_type));
222
223 static void
224 mmix_set_relaxable_size
225 PARAMS ((bfd *, asection *, void *));
226
227
228 /* Watch out: this currently needs to have elements with the same index as
229 their R_MMIX_ number. */
230 static reloc_howto_type elf_mmix_howto_table[] =
231 {
232 /* This reloc does nothing. */
233 HOWTO (R_MMIX_NONE, /* type */
234 0, /* rightshift */
235 2, /* size (0 = byte, 1 = short, 2 = long) */
236 32, /* bitsize */
237 FALSE, /* pc_relative */
238 0, /* bitpos */
239 complain_overflow_bitfield, /* complain_on_overflow */
240 bfd_elf_generic_reloc, /* special_function */
241 "R_MMIX_NONE", /* name */
242 FALSE, /* partial_inplace */
243 0, /* src_mask */
244 0, /* dst_mask */
245 FALSE), /* pcrel_offset */
246
247 /* An 8 bit absolute relocation. */
248 HOWTO (R_MMIX_8, /* type */
249 0, /* rightshift */
250 0, /* size (0 = byte, 1 = short, 2 = long) */
251 8, /* bitsize */
252 FALSE, /* pc_relative */
253 0, /* bitpos */
254 complain_overflow_bitfield, /* complain_on_overflow */
255 bfd_elf_generic_reloc, /* special_function */
256 "R_MMIX_8", /* name */
257 FALSE, /* partial_inplace */
258 0, /* src_mask */
259 0xff, /* dst_mask */
260 FALSE), /* pcrel_offset */
261
262 /* An 16 bit absolute relocation. */
263 HOWTO (R_MMIX_16, /* type */
264 0, /* rightshift */
265 1, /* size (0 = byte, 1 = short, 2 = long) */
266 16, /* bitsize */
267 FALSE, /* pc_relative */
268 0, /* bitpos */
269 complain_overflow_bitfield, /* complain_on_overflow */
270 bfd_elf_generic_reloc, /* special_function */
271 "R_MMIX_16", /* name */
272 FALSE, /* partial_inplace */
273 0, /* src_mask */
274 0xffff, /* dst_mask */
275 FALSE), /* pcrel_offset */
276
277 /* An 24 bit absolute relocation. */
278 HOWTO (R_MMIX_24, /* type */
279 0, /* rightshift */
280 2, /* size (0 = byte, 1 = short, 2 = long) */
281 24, /* bitsize */
282 FALSE, /* pc_relative */
283 0, /* bitpos */
284 complain_overflow_bitfield, /* complain_on_overflow */
285 bfd_elf_generic_reloc, /* special_function */
286 "R_MMIX_24", /* name */
287 FALSE, /* partial_inplace */
288 ~0xffffff, /* src_mask */
289 0xffffff, /* dst_mask */
290 FALSE), /* pcrel_offset */
291
292 /* A 32 bit absolute relocation. */
293 HOWTO (R_MMIX_32, /* type */
294 0, /* rightshift */
295 2, /* size (0 = byte, 1 = short, 2 = long) */
296 32, /* bitsize */
297 FALSE, /* pc_relative */
298 0, /* bitpos */
299 complain_overflow_bitfield, /* complain_on_overflow */
300 bfd_elf_generic_reloc, /* special_function */
301 "R_MMIX_32", /* name */
302 FALSE, /* partial_inplace */
303 0, /* src_mask */
304 0xffffffff, /* dst_mask */
305 FALSE), /* pcrel_offset */
306
307 /* 64 bit relocation. */
308 HOWTO (R_MMIX_64, /* type */
309 0, /* rightshift */
310 4, /* size (0 = byte, 1 = short, 2 = long) */
311 64, /* bitsize */
312 FALSE, /* pc_relative */
313 0, /* bitpos */
314 complain_overflow_bitfield, /* complain_on_overflow */
315 bfd_elf_generic_reloc, /* special_function */
316 "R_MMIX_64", /* name */
317 FALSE, /* partial_inplace */
318 0, /* src_mask */
319 MINUS_ONE, /* dst_mask */
320 FALSE), /* pcrel_offset */
321
322 /* An 8 bit PC-relative relocation. */
323 HOWTO (R_MMIX_PC_8, /* type */
324 0, /* rightshift */
325 0, /* size (0 = byte, 1 = short, 2 = long) */
326 8, /* bitsize */
327 TRUE, /* pc_relative */
328 0, /* bitpos */
329 complain_overflow_bitfield, /* complain_on_overflow */
330 bfd_elf_generic_reloc, /* special_function */
331 "R_MMIX_PC_8", /* name */
332 FALSE, /* partial_inplace */
333 0, /* src_mask */
334 0xff, /* dst_mask */
335 TRUE), /* pcrel_offset */
336
337 /* An 16 bit PC-relative relocation. */
338 HOWTO (R_MMIX_PC_16, /* type */
339 0, /* rightshift */
340 1, /* size (0 = byte, 1 = short, 2 = long) */
341 16, /* bitsize */
342 TRUE, /* pc_relative */
343 0, /* bitpos */
344 complain_overflow_bitfield, /* complain_on_overflow */
345 bfd_elf_generic_reloc, /* special_function */
346 "R_MMIX_PC_16", /* name */
347 FALSE, /* partial_inplace */
348 0, /* src_mask */
349 0xffff, /* dst_mask */
350 TRUE), /* pcrel_offset */
351
352 /* An 24 bit PC-relative relocation. */
353 HOWTO (R_MMIX_PC_24, /* type */
354 0, /* rightshift */
355 2, /* size (0 = byte, 1 = short, 2 = long) */
356 24, /* bitsize */
357 TRUE, /* pc_relative */
358 0, /* bitpos */
359 complain_overflow_bitfield, /* complain_on_overflow */
360 bfd_elf_generic_reloc, /* special_function */
361 "R_MMIX_PC_24", /* name */
362 FALSE, /* partial_inplace */
363 ~0xffffff, /* src_mask */
364 0xffffff, /* dst_mask */
365 TRUE), /* pcrel_offset */
366
367 /* A 32 bit absolute PC-relative relocation. */
368 HOWTO (R_MMIX_PC_32, /* type */
369 0, /* rightshift */
370 2, /* size (0 = byte, 1 = short, 2 = long) */
371 32, /* bitsize */
372 TRUE, /* pc_relative */
373 0, /* bitpos */
374 complain_overflow_bitfield, /* complain_on_overflow */
375 bfd_elf_generic_reloc, /* special_function */
376 "R_MMIX_PC_32", /* name */
377 FALSE, /* partial_inplace */
378 0, /* src_mask */
379 0xffffffff, /* dst_mask */
380 TRUE), /* pcrel_offset */
381
382 /* 64 bit PC-relative relocation. */
383 HOWTO (R_MMIX_PC_64, /* type */
384 0, /* rightshift */
385 4, /* size (0 = byte, 1 = short, 2 = long) */
386 64, /* bitsize */
387 TRUE, /* pc_relative */
388 0, /* bitpos */
389 complain_overflow_bitfield, /* complain_on_overflow */
390 bfd_elf_generic_reloc, /* special_function */
391 "R_MMIX_PC_64", /* name */
392 FALSE, /* partial_inplace */
393 0, /* src_mask */
394 MINUS_ONE, /* dst_mask */
395 TRUE), /* pcrel_offset */
396
397 /* GNU extension to record C++ vtable hierarchy. */
398 HOWTO (R_MMIX_GNU_VTINHERIT, /* type */
399 0, /* rightshift */
400 0, /* size (0 = byte, 1 = short, 2 = long) */
401 0, /* bitsize */
402 FALSE, /* pc_relative */
403 0, /* bitpos */
404 complain_overflow_dont, /* complain_on_overflow */
405 NULL, /* special_function */
406 "R_MMIX_GNU_VTINHERIT", /* name */
407 FALSE, /* partial_inplace */
408 0, /* src_mask */
409 0, /* dst_mask */
410 TRUE), /* pcrel_offset */
411
412 /* GNU extension to record C++ vtable member usage. */
413 HOWTO (R_MMIX_GNU_VTENTRY, /* type */
414 0, /* rightshift */
415 0, /* size (0 = byte, 1 = short, 2 = long) */
416 0, /* bitsize */
417 FALSE, /* pc_relative */
418 0, /* bitpos */
419 complain_overflow_dont, /* complain_on_overflow */
420 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
421 "R_MMIX_GNU_VTENTRY", /* name */
422 FALSE, /* partial_inplace */
423 0, /* src_mask */
424 0, /* dst_mask */
425 FALSE), /* pcrel_offset */
426
427 /* The GETA relocation is supposed to get any address that could
428 possibly be reached by the GETA instruction. It can silently expand
429 to get a 64-bit operand, but will complain if any of the two least
430 significant bits are set. The howto members reflect a simple GETA. */
431 HOWTO (R_MMIX_GETA, /* type */
432 2, /* rightshift */
433 2, /* size (0 = byte, 1 = short, 2 = long) */
434 19, /* bitsize */
435 TRUE, /* pc_relative */
436 0, /* bitpos */
437 complain_overflow_signed, /* complain_on_overflow */
438 mmix_elf_reloc, /* special_function */
439 "R_MMIX_GETA", /* name */
440 FALSE, /* partial_inplace */
441 ~0x0100ffff, /* src_mask */
442 0x0100ffff, /* dst_mask */
443 TRUE), /* pcrel_offset */
444
445 HOWTO (R_MMIX_GETA_1, /* type */
446 2, /* rightshift */
447 2, /* size (0 = byte, 1 = short, 2 = long) */
448 19, /* bitsize */
449 TRUE, /* pc_relative */
450 0, /* bitpos */
451 complain_overflow_signed, /* complain_on_overflow */
452 mmix_elf_reloc, /* special_function */
453 "R_MMIX_GETA_1", /* name */
454 FALSE, /* partial_inplace */
455 ~0x0100ffff, /* src_mask */
456 0x0100ffff, /* dst_mask */
457 TRUE), /* pcrel_offset */
458
459 HOWTO (R_MMIX_GETA_2, /* type */
460 2, /* rightshift */
461 2, /* size (0 = byte, 1 = short, 2 = long) */
462 19, /* bitsize */
463 TRUE, /* pc_relative */
464 0, /* bitpos */
465 complain_overflow_signed, /* complain_on_overflow */
466 mmix_elf_reloc, /* special_function */
467 "R_MMIX_GETA_2", /* name */
468 FALSE, /* partial_inplace */
469 ~0x0100ffff, /* src_mask */
470 0x0100ffff, /* dst_mask */
471 TRUE), /* pcrel_offset */
472
473 HOWTO (R_MMIX_GETA_3, /* type */
474 2, /* rightshift */
475 2, /* size (0 = byte, 1 = short, 2 = long) */
476 19, /* bitsize */
477 TRUE, /* pc_relative */
478 0, /* bitpos */
479 complain_overflow_signed, /* complain_on_overflow */
480 mmix_elf_reloc, /* special_function */
481 "R_MMIX_GETA_3", /* name */
482 FALSE, /* partial_inplace */
483 ~0x0100ffff, /* src_mask */
484 0x0100ffff, /* dst_mask */
485 TRUE), /* pcrel_offset */
486
487 /* The conditional branches are supposed to reach any (code) address.
488 It can silently expand to a 64-bit operand, but will emit an error if
489 any of the two least significant bits are set. The howto members
490 reflect a simple branch. */
491 HOWTO (R_MMIX_CBRANCH, /* type */
492 2, /* rightshift */
493 2, /* size (0 = byte, 1 = short, 2 = long) */
494 19, /* bitsize */
495 TRUE, /* pc_relative */
496 0, /* bitpos */
497 complain_overflow_signed, /* complain_on_overflow */
498 mmix_elf_reloc, /* special_function */
499 "R_MMIX_CBRANCH", /* name */
500 FALSE, /* partial_inplace */
501 ~0x0100ffff, /* src_mask */
502 0x0100ffff, /* dst_mask */
503 TRUE), /* pcrel_offset */
504
505 HOWTO (R_MMIX_CBRANCH_J, /* type */
506 2, /* rightshift */
507 2, /* size (0 = byte, 1 = short, 2 = long) */
508 19, /* bitsize */
509 TRUE, /* pc_relative */
510 0, /* bitpos */
511 complain_overflow_signed, /* complain_on_overflow */
512 mmix_elf_reloc, /* special_function */
513 "R_MMIX_CBRANCH_J", /* name */
514 FALSE, /* partial_inplace */
515 ~0x0100ffff, /* src_mask */
516 0x0100ffff, /* dst_mask */
517 TRUE), /* pcrel_offset */
518
519 HOWTO (R_MMIX_CBRANCH_1, /* type */
520 2, /* rightshift */
521 2, /* size (0 = byte, 1 = short, 2 = long) */
522 19, /* bitsize */
523 TRUE, /* pc_relative */
524 0, /* bitpos */
525 complain_overflow_signed, /* complain_on_overflow */
526 mmix_elf_reloc, /* special_function */
527 "R_MMIX_CBRANCH_1", /* name */
528 FALSE, /* partial_inplace */
529 ~0x0100ffff, /* src_mask */
530 0x0100ffff, /* dst_mask */
531 TRUE), /* pcrel_offset */
532
533 HOWTO (R_MMIX_CBRANCH_2, /* type */
534 2, /* rightshift */
535 2, /* size (0 = byte, 1 = short, 2 = long) */
536 19, /* bitsize */
537 TRUE, /* pc_relative */
538 0, /* bitpos */
539 complain_overflow_signed, /* complain_on_overflow */
540 mmix_elf_reloc, /* special_function */
541 "R_MMIX_CBRANCH_2", /* name */
542 FALSE, /* partial_inplace */
543 ~0x0100ffff, /* src_mask */
544 0x0100ffff, /* dst_mask */
545 TRUE), /* pcrel_offset */
546
547 HOWTO (R_MMIX_CBRANCH_3, /* type */
548 2, /* rightshift */
549 2, /* size (0 = byte, 1 = short, 2 = long) */
550 19, /* bitsize */
551 TRUE, /* pc_relative */
552 0, /* bitpos */
553 complain_overflow_signed, /* complain_on_overflow */
554 mmix_elf_reloc, /* special_function */
555 "R_MMIX_CBRANCH_3", /* name */
556 FALSE, /* partial_inplace */
557 ~0x0100ffff, /* src_mask */
558 0x0100ffff, /* dst_mask */
559 TRUE), /* pcrel_offset */
560
561 /* The PUSHJ instruction can reach any (code) address, as long as it's
562 the beginning of a function (no usable restriction). It can silently
563 expand to a 64-bit operand, but will emit an error if any of the two
564 least significant bits are set. It can also expand into a call to a
565 stub; see R_MMIX_PUSHJ_STUBBABLE. The howto members reflect a simple
566 PUSHJ. */
567 HOWTO (R_MMIX_PUSHJ, /* type */
568 2, /* rightshift */
569 2, /* size (0 = byte, 1 = short, 2 = long) */
570 19, /* bitsize */
571 TRUE, /* pc_relative */
572 0, /* bitpos */
573 complain_overflow_signed, /* complain_on_overflow */
574 mmix_elf_reloc, /* special_function */
575 "R_MMIX_PUSHJ", /* name */
576 FALSE, /* partial_inplace */
577 ~0x0100ffff, /* src_mask */
578 0x0100ffff, /* dst_mask */
579 TRUE), /* pcrel_offset */
580
581 HOWTO (R_MMIX_PUSHJ_1, /* type */
582 2, /* rightshift */
583 2, /* size (0 = byte, 1 = short, 2 = long) */
584 19, /* bitsize */
585 TRUE, /* pc_relative */
586 0, /* bitpos */
587 complain_overflow_signed, /* complain_on_overflow */
588 mmix_elf_reloc, /* special_function */
589 "R_MMIX_PUSHJ_1", /* name */
590 FALSE, /* partial_inplace */
591 ~0x0100ffff, /* src_mask */
592 0x0100ffff, /* dst_mask */
593 TRUE), /* pcrel_offset */
594
595 HOWTO (R_MMIX_PUSHJ_2, /* type */
596 2, /* rightshift */
597 2, /* size (0 = byte, 1 = short, 2 = long) */
598 19, /* bitsize */
599 TRUE, /* pc_relative */
600 0, /* bitpos */
601 complain_overflow_signed, /* complain_on_overflow */
602 mmix_elf_reloc, /* special_function */
603 "R_MMIX_PUSHJ_2", /* name */
604 FALSE, /* partial_inplace */
605 ~0x0100ffff, /* src_mask */
606 0x0100ffff, /* dst_mask */
607 TRUE), /* pcrel_offset */
608
609 HOWTO (R_MMIX_PUSHJ_3, /* type */
610 2, /* rightshift */
611 2, /* size (0 = byte, 1 = short, 2 = long) */
612 19, /* bitsize */
613 TRUE, /* pc_relative */
614 0, /* bitpos */
615 complain_overflow_signed, /* complain_on_overflow */
616 mmix_elf_reloc, /* special_function */
617 "R_MMIX_PUSHJ_3", /* name */
618 FALSE, /* partial_inplace */
619 ~0x0100ffff, /* src_mask */
620 0x0100ffff, /* dst_mask */
621 TRUE), /* pcrel_offset */
622
623 /* A JMP is supposed to reach any (code) address. By itself, it can
624 reach +-64M; the expansion can reach all 64 bits. Note that the 64M
625 limit is soon reached if you link the program in wildly different
626 memory segments. The howto members reflect a trivial JMP. */
627 HOWTO (R_MMIX_JMP, /* type */
628 2, /* rightshift */
629 2, /* size (0 = byte, 1 = short, 2 = long) */
630 27, /* bitsize */
631 TRUE, /* pc_relative */
632 0, /* bitpos */
633 complain_overflow_signed, /* complain_on_overflow */
634 mmix_elf_reloc, /* special_function */
635 "R_MMIX_JMP", /* name */
636 FALSE, /* partial_inplace */
637 ~0x1ffffff, /* src_mask */
638 0x1ffffff, /* dst_mask */
639 TRUE), /* pcrel_offset */
640
641 HOWTO (R_MMIX_JMP_1, /* type */
642 2, /* rightshift */
643 2, /* size (0 = byte, 1 = short, 2 = long) */
644 27, /* bitsize */
645 TRUE, /* pc_relative */
646 0, /* bitpos */
647 complain_overflow_signed, /* complain_on_overflow */
648 mmix_elf_reloc, /* special_function */
649 "R_MMIX_JMP_1", /* name */
650 FALSE, /* partial_inplace */
651 ~0x1ffffff, /* src_mask */
652 0x1ffffff, /* dst_mask */
653 TRUE), /* pcrel_offset */
654
655 HOWTO (R_MMIX_JMP_2, /* type */
656 2, /* rightshift */
657 2, /* size (0 = byte, 1 = short, 2 = long) */
658 27, /* bitsize */
659 TRUE, /* pc_relative */
660 0, /* bitpos */
661 complain_overflow_signed, /* complain_on_overflow */
662 mmix_elf_reloc, /* special_function */
663 "R_MMIX_JMP_2", /* name */
664 FALSE, /* partial_inplace */
665 ~0x1ffffff, /* src_mask */
666 0x1ffffff, /* dst_mask */
667 TRUE), /* pcrel_offset */
668
669 HOWTO (R_MMIX_JMP_3, /* type */
670 2, /* rightshift */
671 2, /* size (0 = byte, 1 = short, 2 = long) */
672 27, /* bitsize */
673 TRUE, /* pc_relative */
674 0, /* bitpos */
675 complain_overflow_signed, /* complain_on_overflow */
676 mmix_elf_reloc, /* special_function */
677 "R_MMIX_JMP_3", /* name */
678 FALSE, /* partial_inplace */
679 ~0x1ffffff, /* src_mask */
680 0x1ffffff, /* dst_mask */
681 TRUE), /* pcrel_offset */
682
683 /* When we don't emit link-time-relaxable code from the assembler, or
684 when relaxation has done all it can do, these relocs are used. For
685 GETA/PUSHJ/branches. */
686 HOWTO (R_MMIX_ADDR19, /* type */
687 2, /* rightshift */
688 2, /* size (0 = byte, 1 = short, 2 = long) */
689 19, /* bitsize */
690 TRUE, /* pc_relative */
691 0, /* bitpos */
692 complain_overflow_signed, /* complain_on_overflow */
693 mmix_elf_reloc, /* special_function */
694 "R_MMIX_ADDR19", /* name */
695 FALSE, /* partial_inplace */
696 ~0x0100ffff, /* src_mask */
697 0x0100ffff, /* dst_mask */
698 TRUE), /* pcrel_offset */
699
700 /* For JMP. */
701 HOWTO (R_MMIX_ADDR27, /* type */
702 2, /* rightshift */
703 2, /* size (0 = byte, 1 = short, 2 = long) */
704 27, /* bitsize */
705 TRUE, /* pc_relative */
706 0, /* bitpos */
707 complain_overflow_signed, /* complain_on_overflow */
708 mmix_elf_reloc, /* special_function */
709 "R_MMIX_ADDR27", /* name */
710 FALSE, /* partial_inplace */
711 ~0x1ffffff, /* src_mask */
712 0x1ffffff, /* dst_mask */
713 TRUE), /* pcrel_offset */
714
715 /* A general register or the value 0..255. If a value, then the
716 instruction (offset -3) needs adjusting. */
717 HOWTO (R_MMIX_REG_OR_BYTE, /* type */
718 0, /* rightshift */
719 1, /* size (0 = byte, 1 = short, 2 = long) */
720 8, /* bitsize */
721 FALSE, /* pc_relative */
722 0, /* bitpos */
723 complain_overflow_bitfield, /* complain_on_overflow */
724 mmix_elf_reloc, /* special_function */
725 "R_MMIX_REG_OR_BYTE", /* name */
726 FALSE, /* partial_inplace */
727 0, /* src_mask */
728 0xff, /* dst_mask */
729 FALSE), /* pcrel_offset */
730
731 /* A general register. */
732 HOWTO (R_MMIX_REG, /* type */
733 0, /* rightshift */
734 1, /* size (0 = byte, 1 = short, 2 = long) */
735 8, /* bitsize */
736 FALSE, /* pc_relative */
737 0, /* bitpos */
738 complain_overflow_bitfield, /* complain_on_overflow */
739 mmix_elf_reloc, /* special_function */
740 "R_MMIX_REG", /* name */
741 FALSE, /* partial_inplace */
742 0, /* src_mask */
743 0xff, /* dst_mask */
744 FALSE), /* pcrel_offset */
745
746 /* A register plus an index, corresponding to the relocation expression.
747 The sizes must correspond to the valid range of the expression, while
748 the bitmasks correspond to what we store in the image. */
749 HOWTO (R_MMIX_BASE_PLUS_OFFSET, /* type */
750 0, /* rightshift */
751 4, /* size (0 = byte, 1 = short, 2 = long) */
752 64, /* bitsize */
753 FALSE, /* pc_relative */
754 0, /* bitpos */
755 complain_overflow_bitfield, /* complain_on_overflow */
756 mmix_elf_reloc, /* special_function */
757 "R_MMIX_BASE_PLUS_OFFSET", /* name */
758 FALSE, /* partial_inplace */
759 0, /* src_mask */
760 0xffff, /* dst_mask */
761 FALSE), /* pcrel_offset */
762
763 /* A "magic" relocation for a LOCAL expression, asserting that the
764 expression is less than the number of global registers. No actual
765 modification of the contents is done. Implementing this as a
766 relocation was less intrusive than e.g. putting such expressions in a
767 section to discard *after* relocation. */
768 HOWTO (R_MMIX_LOCAL, /* type */
769 0, /* rightshift */
770 0, /* size (0 = byte, 1 = short, 2 = long) */
771 0, /* bitsize */
772 FALSE, /* pc_relative */
773 0, /* bitpos */
774 complain_overflow_dont, /* complain_on_overflow */
775 mmix_elf_reloc, /* special_function */
776 "R_MMIX_LOCAL", /* name */
777 FALSE, /* partial_inplace */
778 0, /* src_mask */
779 0, /* dst_mask */
780 FALSE), /* pcrel_offset */
781
782 HOWTO (R_MMIX_PUSHJ_STUBBABLE, /* type */
783 2, /* rightshift */
784 2, /* size (0 = byte, 1 = short, 2 = long) */
785 19, /* bitsize */
786 TRUE, /* pc_relative */
787 0, /* bitpos */
788 complain_overflow_signed, /* complain_on_overflow */
789 mmix_elf_reloc, /* special_function */
790 "R_MMIX_PUSHJ_STUBBABLE", /* name */
791 FALSE, /* partial_inplace */
792 ~0x0100ffff, /* src_mask */
793 0x0100ffff, /* dst_mask */
794 TRUE) /* pcrel_offset */
795 };
796
797
798 /* Map BFD reloc types to MMIX ELF reloc types. */
799
800 struct mmix_reloc_map
801 {
802 bfd_reloc_code_real_type bfd_reloc_val;
803 enum elf_mmix_reloc_type elf_reloc_val;
804 };
805
806
807 static const struct mmix_reloc_map mmix_reloc_map[] =
808 {
809 {BFD_RELOC_NONE, R_MMIX_NONE},
810 {BFD_RELOC_8, R_MMIX_8},
811 {BFD_RELOC_16, R_MMIX_16},
812 {BFD_RELOC_24, R_MMIX_24},
813 {BFD_RELOC_32, R_MMIX_32},
814 {BFD_RELOC_64, R_MMIX_64},
815 {BFD_RELOC_8_PCREL, R_MMIX_PC_8},
816 {BFD_RELOC_16_PCREL, R_MMIX_PC_16},
817 {BFD_RELOC_24_PCREL, R_MMIX_PC_24},
818 {BFD_RELOC_32_PCREL, R_MMIX_PC_32},
819 {BFD_RELOC_64_PCREL, R_MMIX_PC_64},
820 {BFD_RELOC_VTABLE_INHERIT, R_MMIX_GNU_VTINHERIT},
821 {BFD_RELOC_VTABLE_ENTRY, R_MMIX_GNU_VTENTRY},
822 {BFD_RELOC_MMIX_GETA, R_MMIX_GETA},
823 {BFD_RELOC_MMIX_CBRANCH, R_MMIX_CBRANCH},
824 {BFD_RELOC_MMIX_PUSHJ, R_MMIX_PUSHJ},
825 {BFD_RELOC_MMIX_JMP, R_MMIX_JMP},
826 {BFD_RELOC_MMIX_ADDR19, R_MMIX_ADDR19},
827 {BFD_RELOC_MMIX_ADDR27, R_MMIX_ADDR27},
828 {BFD_RELOC_MMIX_REG_OR_BYTE, R_MMIX_REG_OR_BYTE},
829 {BFD_RELOC_MMIX_REG, R_MMIX_REG},
830 {BFD_RELOC_MMIX_BASE_PLUS_OFFSET, R_MMIX_BASE_PLUS_OFFSET},
831 {BFD_RELOC_MMIX_LOCAL, R_MMIX_LOCAL},
832 {BFD_RELOC_MMIX_PUSHJ_STUBBABLE, R_MMIX_PUSHJ_STUBBABLE}
833 };
834
835 static reloc_howto_type *
836 bfd_elf64_bfd_reloc_type_lookup (abfd, code)
837 bfd *abfd ATTRIBUTE_UNUSED;
838 bfd_reloc_code_real_type code;
839 {
840 unsigned int i;
841
842 for (i = 0;
843 i < sizeof (mmix_reloc_map) / sizeof (mmix_reloc_map[0]);
844 i++)
845 {
846 if (mmix_reloc_map[i].bfd_reloc_val == code)
847 return &elf_mmix_howto_table[mmix_reloc_map[i].elf_reloc_val];
848 }
849
850 return NULL;
851 }
852
853 static reloc_howto_type *
854 bfd_elf64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
855 const char *r_name)
856 {
857 unsigned int i;
858
859 for (i = 0;
860 i < sizeof (elf_mmix_howto_table) / sizeof (elf_mmix_howto_table[0]);
861 i++)
862 if (elf_mmix_howto_table[i].name != NULL
863 && strcasecmp (elf_mmix_howto_table[i].name, r_name) == 0)
864 return &elf_mmix_howto_table[i];
865
866 return NULL;
867 }
868
869 static bfd_boolean
870 mmix_elf_new_section_hook (abfd, sec)
871 bfd *abfd;
872 asection *sec;
873 {
874 if (!sec->used_by_bfd)
875 {
876 struct _mmix_elf_section_data *sdata;
877 bfd_size_type amt = sizeof (*sdata);
878
879 sdata = bfd_zalloc (abfd, amt);
880 if (sdata == NULL)
881 return FALSE;
882 sec->used_by_bfd = sdata;
883 }
884
885 return _bfd_elf_new_section_hook (abfd, sec);
886 }
887
888
889 /* This function performs the actual bitfiddling and sanity check for a
890 final relocation. Each relocation gets its *worst*-case expansion
891 in size when it arrives here; any reduction in size should have been
892 caught in linker relaxation earlier. When we get here, the relocation
893 looks like the smallest instruction with SWYM:s (nop:s) appended to the
894 max size. We fill in those nop:s.
895
896 R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra)
897 GETA $N,foo
898 ->
899 SETL $N,foo & 0xffff
900 INCML $N,(foo >> 16) & 0xffff
901 INCMH $N,(foo >> 32) & 0xffff
902 INCH $N,(foo >> 48) & 0xffff
903
904 R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but
905 condbranches needing relaxation might be rare enough to not be
906 worthwhile.)
907 [P]Bcc $N,foo
908 ->
909 [~P]B~cc $N,.+20
910 SETL $255,foo & ...
911 INCML ...
912 INCMH ...
913 INCH ...
914 GO $255,$255,0
915
916 R_MMIX_PUSHJ: (FIXME: Relaxation...)
917 PUSHJ $N,foo
918 ->
919 SETL $255,foo & ...
920 INCML ...
921 INCMH ...
922 INCH ...
923 PUSHGO $N,$255,0
924
925 R_MMIX_JMP: (FIXME: Relaxation...)
926 JMP foo
927 ->
928 SETL $255,foo & ...
929 INCML ...
930 INCMH ...
931 INCH ...
932 GO $255,$255,0
933
934 R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */
935
936 static bfd_reloc_status_type
937 mmix_elf_perform_relocation (isec, howto, datap, addr, value)
938 asection *isec;
939 reloc_howto_type *howto;
940 PTR datap;
941 bfd_vma addr;
942 bfd_vma value;
943 {
944 bfd *abfd = isec->owner;
945 bfd_reloc_status_type flag = bfd_reloc_ok;
946 bfd_reloc_status_type r;
947 int offs = 0;
948 int reg = 255;
949
950 /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences.
951 We handle the differences here and the common sequence later. */
952 switch (howto->type)
953 {
954 case R_MMIX_GETA:
955 offs = 0;
956 reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1);
957
958 /* We change to an absolute value. */
959 value += addr;
960 break;
961
962 case R_MMIX_CBRANCH:
963 {
964 int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16;
965
966 /* Invert the condition and prediction bit, and set the offset
967 to five instructions ahead.
968
969 We *can* do better if we want to. If the branch is found to be
970 within limits, we could leave the branch as is; there'll just
971 be a bunch of NOP:s after it. But we shouldn't see this
972 sequence often enough that it's worth doing it. */
973
974 bfd_put_32 (abfd,
975 (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff)
976 | (24/4)),
977 (bfd_byte *) datap);
978
979 /* Put a "GO $255,$255,0" after the common sequence. */
980 bfd_put_32 (abfd,
981 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00,
982 (bfd_byte *) datap + 20);
983
984 /* Common sequence starts at offset 4. */
985 offs = 4;
986
987 /* We change to an absolute value. */
988 value += addr;
989 }
990 break;
991
992 case R_MMIX_PUSHJ_STUBBABLE:
993 /* If the address fits, we're fine. */
994 if ((value & 3) == 0
995 /* Note rightshift 0; see R_MMIX_JMP case below. */
996 && (r = bfd_check_overflow (complain_overflow_signed,
997 howto->bitsize,
998 0,
999 bfd_arch_bits_per_address (abfd),
1000 value)) == bfd_reloc_ok)
1001 goto pcrel_mmix_reloc_fits;
1002 else
1003 {
1004 bfd_size_type size = isec->rawsize ? isec->rawsize : isec->size;
1005
1006 /* We have the bytes at the PUSHJ insn and need to get the
1007 position for the stub. There's supposed to be room allocated
1008 for the stub. */
1009 bfd_byte *stubcontents
1010 = ((bfd_byte *) datap
1011 - (addr - (isec->output_section->vma + isec->output_offset))
1012 + size
1013 + mmix_elf_section_data (isec)->pjs.stub_offset);
1014 bfd_vma stubaddr;
1015
1016 /* The address doesn't fit, so redirect the PUSHJ to the
1017 location of the stub. */
1018 r = mmix_elf_perform_relocation (isec,
1019 &elf_mmix_howto_table
1020 [R_MMIX_ADDR19],
1021 datap,
1022 addr,
1023 isec->output_section->vma
1024 + isec->output_offset
1025 + size
1026 + (mmix_elf_section_data (isec)
1027 ->pjs.stub_offset)
1028 - addr);
1029 if (r != bfd_reloc_ok)
1030 return r;
1031
1032 stubaddr
1033 = (isec->output_section->vma
1034 + isec->output_offset
1035 + size
1036 + mmix_elf_section_data (isec)->pjs.stub_offset);
1037
1038 /* We generate a simple JMP if that suffices, else the whole 5
1039 insn stub. */
1040 if (bfd_check_overflow (complain_overflow_signed,
1041 elf_mmix_howto_table[R_MMIX_ADDR27].bitsize,
1042 0,
1043 bfd_arch_bits_per_address (abfd),
1044 addr + value - stubaddr) == bfd_reloc_ok)
1045 {
1046 bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents);
1047 r = mmix_elf_perform_relocation (isec,
1048 &elf_mmix_howto_table
1049 [R_MMIX_ADDR27],
1050 stubcontents,
1051 stubaddr,
1052 value + addr - stubaddr);
1053 mmix_elf_section_data (isec)->pjs.stub_offset += 4;
1054
1055 if (size + mmix_elf_section_data (isec)->pjs.stub_offset
1056 > isec->size)
1057 abort ();
1058
1059 return r;
1060 }
1061 else
1062 {
1063 /* Put a "GO $255,0" after the common sequence. */
1064 bfd_put_32 (abfd,
1065 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
1066 | 0xff00, (bfd_byte *) stubcontents + 16);
1067
1068 /* Prepare for the general code to set the first part of the
1069 linker stub, and */
1070 value += addr;
1071 datap = stubcontents;
1072 mmix_elf_section_data (isec)->pjs.stub_offset
1073 += MAX_PUSHJ_STUB_SIZE;
1074 }
1075 }
1076 break;
1077
1078 case R_MMIX_PUSHJ:
1079 {
1080 int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1);
1081
1082 /* Put a "PUSHGO $N,$255,0" after the common sequence. */
1083 bfd_put_32 (abfd,
1084 ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
1085 | (inreg << 16)
1086 | 0xff00,
1087 (bfd_byte *) datap + 16);
1088
1089 /* We change to an absolute value. */
1090 value += addr;
1091 }
1092 break;
1093
1094 case R_MMIX_JMP:
1095 /* This one is a little special. If we get here on a non-relaxing
1096 link, and the destination is actually in range, we don't need to
1097 execute the nops.
1098 If so, we fall through to the bit-fiddling relocs.
1099
1100 FIXME: bfd_check_overflow seems broken; the relocation is
1101 rightshifted before testing, so supply a zero rightshift. */
1102
1103 if (! ((value & 3) == 0
1104 && (r = bfd_check_overflow (complain_overflow_signed,
1105 howto->bitsize,
1106 0,
1107 bfd_arch_bits_per_address (abfd),
1108 value)) == bfd_reloc_ok))
1109 {
1110 /* If the relocation doesn't fit in a JMP, we let the NOP:s be
1111 modified below, and put a "GO $255,$255,0" after the
1112 address-loading sequence. */
1113 bfd_put_32 (abfd,
1114 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
1115 | 0xffff00,
1116 (bfd_byte *) datap + 16);
1117
1118 /* We change to an absolute value. */
1119 value += addr;
1120 break;
1121 }
1122 /* FALLTHROUGH. */
1123 case R_MMIX_ADDR19:
1124 case R_MMIX_ADDR27:
1125 pcrel_mmix_reloc_fits:
1126 /* These must be in range, or else we emit an error. */
1127 if ((value & 3) == 0
1128 /* Note rightshift 0; see above. */
1129 && (r = bfd_check_overflow (complain_overflow_signed,
1130 howto->bitsize,
1131 0,
1132 bfd_arch_bits_per_address (abfd),
1133 value)) == bfd_reloc_ok)
1134 {
1135 bfd_vma in1
1136 = bfd_get_32 (abfd, (bfd_byte *) datap);
1137 bfd_vma highbit;
1138
1139 if ((bfd_signed_vma) value < 0)
1140 {
1141 highbit = 1 << 24;
1142 value += (1 << (howto->bitsize - 1));
1143 }
1144 else
1145 highbit = 0;
1146
1147 value >>= 2;
1148
1149 bfd_put_32 (abfd,
1150 (in1 & howto->src_mask)
1151 | highbit
1152 | (value & howto->dst_mask),
1153 (bfd_byte *) datap);
1154
1155 return bfd_reloc_ok;
1156 }
1157 else
1158 return bfd_reloc_overflow;
1159
1160 case R_MMIX_BASE_PLUS_OFFSET:
1161 {
1162 struct bpo_reloc_section_info *bpodata
1163 = mmix_elf_section_data (isec)->bpo.reloc;
1164 asection *bpo_greg_section
1165 = bpodata->bpo_greg_section;
1166 struct bpo_greg_section_info *gregdata
1167 = mmix_elf_section_data (bpo_greg_section)->bpo.greg;
1168 size_t bpo_index
1169 = gregdata->bpo_reloc_indexes[bpodata->bpo_index++];
1170
1171 /* A consistency check: The value we now have in "relocation" must
1172 be the same as the value we stored for that relocation. It
1173 doesn't cost much, so can be left in at all times. */
1174 if (value != gregdata->reloc_request[bpo_index].value)
1175 {
1176 (*_bfd_error_handler)
1177 (_("%s: Internal inconsistency error for value for\n\
1178 linker-allocated global register: linked: 0x%lx%08lx != relaxed: 0x%lx%08lx\n"),
1179 bfd_get_filename (isec->owner),
1180 (unsigned long) (value >> 32), (unsigned long) value,
1181 (unsigned long) (gregdata->reloc_request[bpo_index].value
1182 >> 32),
1183 (unsigned long) gregdata->reloc_request[bpo_index].value);
1184 bfd_set_error (bfd_error_bad_value);
1185 return bfd_reloc_overflow;
1186 }
1187
1188 /* Then store the register number and offset for that register
1189 into datap and datap + 1 respectively. */
1190 bfd_put_8 (abfd,
1191 gregdata->reloc_request[bpo_index].regindex
1192 + bpo_greg_section->output_section->vma / 8,
1193 datap);
1194 bfd_put_8 (abfd,
1195 gregdata->reloc_request[bpo_index].offset,
1196 ((unsigned char *) datap) + 1);
1197 return bfd_reloc_ok;
1198 }
1199
1200 case R_MMIX_REG_OR_BYTE:
1201 case R_MMIX_REG:
1202 if (value > 255)
1203 return bfd_reloc_overflow;
1204 bfd_put_8 (abfd, value, datap);
1205 return bfd_reloc_ok;
1206
1207 default:
1208 BAD_CASE (howto->type);
1209 }
1210
1211 /* This code adds the common SETL/INCML/INCMH/INCH worst-case
1212 sequence. */
1213
1214 /* Lowest two bits must be 0. We return bfd_reloc_overflow for
1215 everything that looks strange. */
1216 if (value & 3)
1217 flag = bfd_reloc_overflow;
1218
1219 bfd_put_32 (abfd,
1220 (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16),
1221 (bfd_byte *) datap + offs);
1222 bfd_put_32 (abfd,
1223 (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16),
1224 (bfd_byte *) datap + offs + 4);
1225 bfd_put_32 (abfd,
1226 (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16),
1227 (bfd_byte *) datap + offs + 8);
1228 bfd_put_32 (abfd,
1229 (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16),
1230 (bfd_byte *) datap + offs + 12);
1231
1232 return flag;
1233 }
1234
1235 /* Set the howto pointer for an MMIX ELF reloc (type RELA). */
1236
1237 static void
1238 mmix_info_to_howto_rela (abfd, cache_ptr, dst)
1239 bfd *abfd ATTRIBUTE_UNUSED;
1240 arelent *cache_ptr;
1241 Elf_Internal_Rela *dst;
1242 {
1243 unsigned int r_type;
1244
1245 r_type = ELF64_R_TYPE (dst->r_info);
1246 BFD_ASSERT (r_type < (unsigned int) R_MMIX_max);
1247 cache_ptr->howto = &elf_mmix_howto_table[r_type];
1248 }
1249
1250 /* Any MMIX-specific relocation gets here at assembly time or when linking
1251 to other formats (such as mmo); this is the relocation function from
1252 the reloc_table. We don't get here for final pure ELF linking. */
1253
1254 static bfd_reloc_status_type
1255 mmix_elf_reloc (abfd, reloc_entry, symbol, data, input_section,
1256 output_bfd, error_message)
1257 bfd *abfd;
1258 arelent *reloc_entry;
1259 asymbol *symbol;
1260 PTR data;
1261 asection *input_section;
1262 bfd *output_bfd;
1263 char **error_message ATTRIBUTE_UNUSED;
1264 {
1265 bfd_vma relocation;
1266 bfd_reloc_status_type r;
1267 asection *reloc_target_output_section;
1268 bfd_reloc_status_type flag = bfd_reloc_ok;
1269 bfd_vma output_base = 0;
1270
1271 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1272 input_section, output_bfd, error_message);
1273
1274 /* If that was all that was needed (i.e. this isn't a final link, only
1275 some segment adjustments), we're done. */
1276 if (r != bfd_reloc_continue)
1277 return r;
1278
1279 if (bfd_is_und_section (symbol->section)
1280 && (symbol->flags & BSF_WEAK) == 0
1281 && output_bfd == (bfd *) NULL)
1282 return bfd_reloc_undefined;
1283
1284 /* Is the address of the relocation really within the section? */
1285 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
1286 return bfd_reloc_outofrange;
1287
1288 /* Work out which section the relocation is targeted at and the
1289 initial relocation command value. */
1290
1291 /* Get symbol value. (Common symbols are special.) */
1292 if (bfd_is_com_section (symbol->section))
1293 relocation = 0;
1294 else
1295 relocation = symbol->value;
1296
1297 reloc_target_output_section = bfd_get_output_section (symbol);
1298
1299 /* Here the variable relocation holds the final address of the symbol we
1300 are relocating against, plus any addend. */
1301 if (output_bfd)
1302 output_base = 0;
1303 else
1304 output_base = reloc_target_output_section->vma;
1305
1306 relocation += output_base + symbol->section->output_offset;
1307
1308 if (output_bfd != (bfd *) NULL)
1309 {
1310 /* Add in supplied addend. */
1311 relocation += reloc_entry->addend;
1312
1313 /* This is a partial relocation, and we want to apply the
1314 relocation to the reloc entry rather than the raw data.
1315 Modify the reloc inplace to reflect what we now know. */
1316 reloc_entry->addend = relocation;
1317 reloc_entry->address += input_section->output_offset;
1318 return flag;
1319 }
1320
1321 return mmix_final_link_relocate (reloc_entry->howto, input_section,
1322 data, reloc_entry->address,
1323 reloc_entry->addend, relocation,
1324 bfd_asymbol_name (symbol),
1325 reloc_target_output_section);
1326 }
1327 \f
1328 /* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it
1329 for guidance if you're thinking of copying this. */
1330
1331 static bfd_boolean
1332 mmix_elf_relocate_section (output_bfd, info, input_bfd, input_section,
1333 contents, relocs, local_syms, local_sections)
1334 bfd *output_bfd ATTRIBUTE_UNUSED;
1335 struct bfd_link_info *info;
1336 bfd *input_bfd;
1337 asection *input_section;
1338 bfd_byte *contents;
1339 Elf_Internal_Rela *relocs;
1340 Elf_Internal_Sym *local_syms;
1341 asection **local_sections;
1342 {
1343 Elf_Internal_Shdr *symtab_hdr;
1344 struct elf_link_hash_entry **sym_hashes;
1345 Elf_Internal_Rela *rel;
1346 Elf_Internal_Rela *relend;
1347 bfd_size_type size;
1348 size_t pjsno = 0;
1349
1350 size = input_section->rawsize ? input_section->rawsize : input_section->size;
1351 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1352 sym_hashes = elf_sym_hashes (input_bfd);
1353 relend = relocs + input_section->reloc_count;
1354
1355 /* Zero the stub area before we start. */
1356 if (input_section->rawsize != 0
1357 && input_section->size > input_section->rawsize)
1358 memset (contents + input_section->rawsize, 0,
1359 input_section->size - input_section->rawsize);
1360
1361 for (rel = relocs; rel < relend; rel ++)
1362 {
1363 reloc_howto_type *howto;
1364 unsigned long r_symndx;
1365 Elf_Internal_Sym *sym;
1366 asection *sec;
1367 struct elf_link_hash_entry *h;
1368 bfd_vma relocation;
1369 bfd_reloc_status_type r;
1370 const char *name = NULL;
1371 int r_type;
1372 bfd_boolean undefined_signalled = FALSE;
1373
1374 r_type = ELF64_R_TYPE (rel->r_info);
1375
1376 if (r_type == R_MMIX_GNU_VTINHERIT
1377 || r_type == R_MMIX_GNU_VTENTRY)
1378 continue;
1379
1380 r_symndx = ELF64_R_SYM (rel->r_info);
1381
1382 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info);
1383 h = NULL;
1384 sym = NULL;
1385 sec = NULL;
1386
1387 if (r_symndx < symtab_hdr->sh_info)
1388 {
1389 sym = local_syms + r_symndx;
1390 sec = local_sections [r_symndx];
1391 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1392
1393 name = bfd_elf_string_from_elf_section (input_bfd,
1394 symtab_hdr->sh_link,
1395 sym->st_name);
1396 if (name == NULL)
1397 name = bfd_section_name (input_bfd, sec);
1398 }
1399 else
1400 {
1401 bfd_boolean unresolved_reloc;
1402
1403 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1404 r_symndx, symtab_hdr, sym_hashes,
1405 h, sec, relocation,
1406 unresolved_reloc, undefined_signalled);
1407 name = h->root.root.string;
1408 }
1409
1410 if (sec != NULL && elf_discarded_section (sec))
1411 {
1412 /* For relocs against symbols from removed linkonce sections,
1413 or sections discarded by a linker script, we just want the
1414 section contents zeroed. Avoid any special processing. */
1415 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
1416 rel->r_info = 0;
1417 rel->r_addend = 0;
1418 continue;
1419 }
1420
1421 if (info->relocatable)
1422 {
1423 /* This is a relocatable link. For most relocs we don't have to
1424 change anything, unless the reloc is against a section
1425 symbol, in which case we have to adjust according to where
1426 the section symbol winds up in the output section. */
1427 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1428 rel->r_addend += sec->output_offset;
1429
1430 /* For PUSHJ stub relocs however, we may need to change the
1431 reloc and the section contents, if the reloc doesn't reach
1432 beyond the end of the output section and previous stubs.
1433 Then we change the section contents to be a PUSHJ to the end
1434 of the input section plus stubs (we can do that without using
1435 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ
1436 at the stub location. */
1437 if (r_type == R_MMIX_PUSHJ_STUBBABLE)
1438 {
1439 /* We've already checked whether we need a stub; use that
1440 knowledge. */
1441 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno]
1442 != 0)
1443 {
1444 Elf_Internal_Rela relcpy;
1445
1446 if (mmix_elf_section_data (input_section)
1447 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE)
1448 abort ();
1449
1450 /* There's already a PUSHJ insn there, so just fill in
1451 the offset bits to the stub. */
1452 if (mmix_final_link_relocate (elf_mmix_howto_table
1453 + R_MMIX_ADDR19,
1454 input_section,
1455 contents,
1456 rel->r_offset,
1457 0,
1458 input_section
1459 ->output_section->vma
1460 + input_section->output_offset
1461 + size
1462 + mmix_elf_section_data (input_section)
1463 ->pjs.stub_offset,
1464 NULL, NULL) != bfd_reloc_ok)
1465 return FALSE;
1466
1467 /* Put a JMP insn at the stub; it goes with the
1468 R_MMIX_JMP reloc. */
1469 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24,
1470 contents
1471 + size
1472 + mmix_elf_section_data (input_section)
1473 ->pjs.stub_offset);
1474
1475 /* Change the reloc to be at the stub, and to a full
1476 R_MMIX_JMP reloc. */
1477 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP);
1478 rel->r_offset
1479 = (size
1480 + mmix_elf_section_data (input_section)
1481 ->pjs.stub_offset);
1482
1483 mmix_elf_section_data (input_section)->pjs.stub_offset
1484 += MAX_PUSHJ_STUB_SIZE;
1485
1486 /* Shift this reloc to the end of the relocs to maintain
1487 the r_offset sorted reloc order. */
1488 relcpy = *rel;
1489 memmove (rel, rel + 1, (char *) relend - (char *) rel);
1490 relend[-1] = relcpy;
1491
1492 /* Back up one reloc, or else we'd skip the next reloc
1493 in turn. */
1494 rel--;
1495 }
1496
1497 pjsno++;
1498 }
1499 continue;
1500 }
1501
1502 r = mmix_final_link_relocate (howto, input_section,
1503 contents, rel->r_offset,
1504 rel->r_addend, relocation, name, sec);
1505
1506 if (r != bfd_reloc_ok)
1507 {
1508 bfd_boolean check_ok = TRUE;
1509 const char * msg = (const char *) NULL;
1510
1511 switch (r)
1512 {
1513 case bfd_reloc_overflow:
1514 check_ok = info->callbacks->reloc_overflow
1515 (info, (h ? &h->root : NULL), name, howto->name,
1516 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1517 break;
1518
1519 case bfd_reloc_undefined:
1520 /* We may have sent this message above. */
1521 if (! undefined_signalled)
1522 check_ok = info->callbacks->undefined_symbol
1523 (info, name, input_bfd, input_section, rel->r_offset,
1524 TRUE);
1525 undefined_signalled = TRUE;
1526 break;
1527
1528 case bfd_reloc_outofrange:
1529 msg = _("internal error: out of range error");
1530 break;
1531
1532 case bfd_reloc_notsupported:
1533 msg = _("internal error: unsupported relocation error");
1534 break;
1535
1536 case bfd_reloc_dangerous:
1537 msg = _("internal error: dangerous relocation");
1538 break;
1539
1540 default:
1541 msg = _("internal error: unknown error");
1542 break;
1543 }
1544
1545 if (msg)
1546 check_ok = info->callbacks->warning
1547 (info, msg, name, input_bfd, input_section, rel->r_offset);
1548
1549 if (! check_ok)
1550 return FALSE;
1551 }
1552 }
1553
1554 return TRUE;
1555 }
1556 \f
1557 /* Perform a single relocation. By default we use the standard BFD
1558 routines. A few relocs we have to do ourselves. */
1559
1560 static bfd_reloc_status_type
1561 mmix_final_link_relocate (howto, input_section, contents,
1562 r_offset, r_addend, relocation, symname, symsec)
1563 reloc_howto_type *howto;
1564 asection *input_section;
1565 bfd_byte *contents;
1566 bfd_vma r_offset;
1567 bfd_signed_vma r_addend;
1568 bfd_vma relocation;
1569 const char *symname;
1570 asection *symsec;
1571 {
1572 bfd_reloc_status_type r = bfd_reloc_ok;
1573 bfd_vma addr
1574 = (input_section->output_section->vma
1575 + input_section->output_offset
1576 + r_offset);
1577 bfd_signed_vma srel
1578 = (bfd_signed_vma) relocation + r_addend;
1579
1580 switch (howto->type)
1581 {
1582 /* All these are PC-relative. */
1583 case R_MMIX_PUSHJ_STUBBABLE:
1584 case R_MMIX_PUSHJ:
1585 case R_MMIX_CBRANCH:
1586 case R_MMIX_ADDR19:
1587 case R_MMIX_GETA:
1588 case R_MMIX_ADDR27:
1589 case R_MMIX_JMP:
1590 contents += r_offset;
1591
1592 srel -= (input_section->output_section->vma
1593 + input_section->output_offset
1594 + r_offset);
1595
1596 r = mmix_elf_perform_relocation (input_section, howto, contents,
1597 addr, srel);
1598 break;
1599
1600 case R_MMIX_BASE_PLUS_OFFSET:
1601 if (symsec == NULL)
1602 return bfd_reloc_undefined;
1603
1604 /* Check that we're not relocating against a register symbol. */
1605 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1606 MMIX_REG_CONTENTS_SECTION_NAME) == 0
1607 || strcmp (bfd_get_section_name (symsec->owner, symsec),
1608 MMIX_REG_SECTION_NAME) == 0)
1609 {
1610 /* Note: This is separated out into two messages in order
1611 to ease the translation into other languages. */
1612 if (symname == NULL || *symname == 0)
1613 (*_bfd_error_handler)
1614 (_("%s: base-plus-offset relocation against register symbol: (unknown) in %s"),
1615 bfd_get_filename (input_section->owner),
1616 bfd_get_section_name (symsec->owner, symsec));
1617 else
1618 (*_bfd_error_handler)
1619 (_("%s: base-plus-offset relocation against register symbol: %s in %s"),
1620 bfd_get_filename (input_section->owner), symname,
1621 bfd_get_section_name (symsec->owner, symsec));
1622 return bfd_reloc_overflow;
1623 }
1624 goto do_mmix_reloc;
1625
1626 case R_MMIX_REG_OR_BYTE:
1627 case R_MMIX_REG:
1628 /* For now, we handle these alike. They must refer to an register
1629 symbol, which is either relative to the register section and in
1630 the range 0..255, or is in the register contents section with vma
1631 regno * 8. */
1632
1633 /* FIXME: A better way to check for reg contents section?
1634 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */
1635 if (symsec == NULL)
1636 return bfd_reloc_undefined;
1637
1638 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1639 MMIX_REG_CONTENTS_SECTION_NAME) == 0)
1640 {
1641 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
1642 {
1643 /* The bfd_reloc_outofrange return value, though intuitively
1644 a better value, will not get us an error. */
1645 return bfd_reloc_overflow;
1646 }
1647 srel /= 8;
1648 }
1649 else if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1650 MMIX_REG_SECTION_NAME) == 0)
1651 {
1652 if (srel < 0 || srel > 255)
1653 /* The bfd_reloc_outofrange return value, though intuitively a
1654 better value, will not get us an error. */
1655 return bfd_reloc_overflow;
1656 }
1657 else
1658 {
1659 /* Note: This is separated out into two messages in order
1660 to ease the translation into other languages. */
1661 if (symname == NULL || *symname == 0)
1662 (*_bfd_error_handler)
1663 (_("%s: register relocation against non-register symbol: (unknown) in %s"),
1664 bfd_get_filename (input_section->owner),
1665 bfd_get_section_name (symsec->owner, symsec));
1666 else
1667 (*_bfd_error_handler)
1668 (_("%s: register relocation against non-register symbol: %s in %s"),
1669 bfd_get_filename (input_section->owner), symname,
1670 bfd_get_section_name (symsec->owner, symsec));
1671
1672 /* The bfd_reloc_outofrange return value, though intuitively a
1673 better value, will not get us an error. */
1674 return bfd_reloc_overflow;
1675 }
1676 do_mmix_reloc:
1677 contents += r_offset;
1678 r = mmix_elf_perform_relocation (input_section, howto, contents,
1679 addr, srel);
1680 break;
1681
1682 case R_MMIX_LOCAL:
1683 /* This isn't a real relocation, it's just an assertion that the
1684 final relocation value corresponds to a local register. We
1685 ignore the actual relocation; nothing is changed. */
1686 {
1687 asection *regsec
1688 = bfd_get_section_by_name (input_section->output_section->owner,
1689 MMIX_REG_CONTENTS_SECTION_NAME);
1690 bfd_vma first_global;
1691
1692 /* Check that this is an absolute value, or a reference to the
1693 register contents section or the register (symbol) section.
1694 Absolute numbers can get here as undefined section. Undefined
1695 symbols are signalled elsewhere, so there's no conflict in us
1696 accidentally handling it. */
1697 if (!bfd_is_abs_section (symsec)
1698 && !bfd_is_und_section (symsec)
1699 && strcmp (bfd_get_section_name (symsec->owner, symsec),
1700 MMIX_REG_CONTENTS_SECTION_NAME) != 0
1701 && strcmp (bfd_get_section_name (symsec->owner, symsec),
1702 MMIX_REG_SECTION_NAME) != 0)
1703 {
1704 (*_bfd_error_handler)
1705 (_("%s: directive LOCAL valid only with a register or absolute value"),
1706 bfd_get_filename (input_section->owner));
1707
1708 return bfd_reloc_overflow;
1709 }
1710
1711 /* If we don't have a register contents section, then $255 is the
1712 first global register. */
1713 if (regsec == NULL)
1714 first_global = 255;
1715 else
1716 {
1717 first_global = bfd_get_section_vma (abfd, regsec) / 8;
1718 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1719 MMIX_REG_CONTENTS_SECTION_NAME) == 0)
1720 {
1721 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
1722 /* The bfd_reloc_outofrange return value, though
1723 intuitively a better value, will not get us an error. */
1724 return bfd_reloc_overflow;
1725 srel /= 8;
1726 }
1727 }
1728
1729 if ((bfd_vma) srel >= first_global)
1730 {
1731 /* FIXME: Better error message. */
1732 (*_bfd_error_handler)
1733 (_("%s: LOCAL directive: Register $%ld is not a local register. First global register is $%ld."),
1734 bfd_get_filename (input_section->owner), (long) srel, (long) first_global);
1735
1736 return bfd_reloc_overflow;
1737 }
1738 }
1739 r = bfd_reloc_ok;
1740 break;
1741
1742 default:
1743 r = _bfd_final_link_relocate (howto, input_section->owner, input_section,
1744 contents, r_offset,
1745 relocation, r_addend);
1746 }
1747
1748 return r;
1749 }
1750 \f
1751 /* Return the section that should be marked against GC for a given
1752 relocation. */
1753
1754 static asection *
1755 mmix_elf_gc_mark_hook (asection *sec,
1756 struct bfd_link_info *info,
1757 Elf_Internal_Rela *rel,
1758 struct elf_link_hash_entry *h,
1759 Elf_Internal_Sym *sym)
1760 {
1761 if (h != NULL)
1762 switch (ELF64_R_TYPE (rel->r_info))
1763 {
1764 case R_MMIX_GNU_VTINHERIT:
1765 case R_MMIX_GNU_VTENTRY:
1766 return NULL;
1767 }
1768
1769 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1770 }
1771
1772 /* Update relocation info for a GC-excluded section. We could supposedly
1773 perform the allocation after GC, but there's no suitable hook between
1774 GC (or section merge) and the point when all input sections must be
1775 present. Better to waste some memory and (perhaps) a little time. */
1776
1777 static bfd_boolean
1778 mmix_elf_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED,
1779 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1780 asection *sec,
1781 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED)
1782 {
1783 struct bpo_reloc_section_info *bpodata
1784 = mmix_elf_section_data (sec)->bpo.reloc;
1785 asection *allocated_gregs_section;
1786
1787 /* If no bpodata here, we have nothing to do. */
1788 if (bpodata == NULL)
1789 return TRUE;
1790
1791 allocated_gregs_section = bpodata->bpo_greg_section;
1792
1793 mmix_elf_section_data (allocated_gregs_section)->bpo.greg->n_bpo_relocs
1794 -= bpodata->n_bpo_relocs_this_section;
1795
1796 return TRUE;
1797 }
1798 \f
1799 /* Sort register relocs to come before expanding relocs. */
1800
1801 static int
1802 mmix_elf_sort_relocs (p1, p2)
1803 const PTR p1;
1804 const PTR p2;
1805 {
1806 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1;
1807 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2;
1808 int r1_is_reg, r2_is_reg;
1809
1810 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive
1811 insns. */
1812 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3))
1813 return 1;
1814 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3))
1815 return -1;
1816
1817 r1_is_reg
1818 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE
1819 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG);
1820 r2_is_reg
1821 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE
1822 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG);
1823 if (r1_is_reg != r2_is_reg)
1824 return r2_is_reg - r1_is_reg;
1825
1826 /* Neither or both are register relocs. Then sort on full offset. */
1827 if (r1->r_offset > r2->r_offset)
1828 return 1;
1829 else if (r1->r_offset < r2->r_offset)
1830 return -1;
1831 return 0;
1832 }
1833
1834 /* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */
1835
1836 static bfd_boolean
1837 mmix_elf_check_common_relocs (abfd, info, sec, relocs)
1838 bfd *abfd;
1839 struct bfd_link_info *info;
1840 asection *sec;
1841 const Elf_Internal_Rela *relocs;
1842 {
1843 bfd *bpo_greg_owner = NULL;
1844 asection *allocated_gregs_section = NULL;
1845 struct bpo_greg_section_info *gregdata = NULL;
1846 struct bpo_reloc_section_info *bpodata = NULL;
1847 const Elf_Internal_Rela *rel;
1848 const Elf_Internal_Rela *rel_end;
1849
1850 /* We currently have to abuse this COFF-specific member, since there's
1851 no target-machine-dedicated member. There's no alternative outside
1852 the bfd_link_info struct; we can't specialize a hash-table since
1853 they're different between ELF and mmo. */
1854 bpo_greg_owner = (bfd *) info->base_file;
1855
1856 rel_end = relocs + sec->reloc_count;
1857 for (rel = relocs; rel < rel_end; rel++)
1858 {
1859 switch (ELF64_R_TYPE (rel->r_info))
1860 {
1861 /* This relocation causes a GREG allocation. We need to count
1862 them, and we need to create a section for them, so we need an
1863 object to fake as the owner of that section. We can't use
1864 the ELF dynobj for this, since the ELF bits assume lots of
1865 DSO-related stuff if that member is non-NULL. */
1866 case R_MMIX_BASE_PLUS_OFFSET:
1867 /* We don't do anything with this reloc for a relocatable link. */
1868 if (info->relocatable)
1869 break;
1870
1871 if (bpo_greg_owner == NULL)
1872 {
1873 bpo_greg_owner = abfd;
1874 info->base_file = (PTR) bpo_greg_owner;
1875 }
1876
1877 if (allocated_gregs_section == NULL)
1878 allocated_gregs_section
1879 = bfd_get_section_by_name (bpo_greg_owner,
1880 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
1881
1882 if (allocated_gregs_section == NULL)
1883 {
1884 allocated_gregs_section
1885 = bfd_make_section_with_flags (bpo_greg_owner,
1886 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME,
1887 (SEC_HAS_CONTENTS
1888 | SEC_IN_MEMORY
1889 | SEC_LINKER_CREATED));
1890 /* Setting both SEC_ALLOC and SEC_LOAD means the section is
1891 treated like any other section, and we'd get errors for
1892 address overlap with the text section. Let's set none of
1893 those flags, as that is what currently happens for usual
1894 GREG allocations, and that works. */
1895 if (allocated_gregs_section == NULL
1896 || !bfd_set_section_alignment (bpo_greg_owner,
1897 allocated_gregs_section,
1898 3))
1899 return FALSE;
1900
1901 gregdata = (struct bpo_greg_section_info *)
1902 bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info));
1903 if (gregdata == NULL)
1904 return FALSE;
1905 mmix_elf_section_data (allocated_gregs_section)->bpo.greg
1906 = gregdata;
1907 }
1908 else if (gregdata == NULL)
1909 gregdata
1910 = mmix_elf_section_data (allocated_gregs_section)->bpo.greg;
1911
1912 /* Get ourselves some auxiliary info for the BPO-relocs. */
1913 if (bpodata == NULL)
1914 {
1915 /* No use doing a separate iteration pass to find the upper
1916 limit - just use the number of relocs. */
1917 bpodata = (struct bpo_reloc_section_info *)
1918 bfd_alloc (bpo_greg_owner,
1919 sizeof (struct bpo_reloc_section_info)
1920 * (sec->reloc_count + 1));
1921 if (bpodata == NULL)
1922 return FALSE;
1923 mmix_elf_section_data (sec)->bpo.reloc = bpodata;
1924 bpodata->first_base_plus_offset_reloc
1925 = bpodata->bpo_index
1926 = gregdata->n_max_bpo_relocs;
1927 bpodata->bpo_greg_section
1928 = allocated_gregs_section;
1929 bpodata->n_bpo_relocs_this_section = 0;
1930 }
1931
1932 bpodata->n_bpo_relocs_this_section++;
1933 gregdata->n_max_bpo_relocs++;
1934
1935 /* We don't get another chance to set this before GC; we've not
1936 set up any hook that runs before GC. */
1937 gregdata->n_bpo_relocs
1938 = gregdata->n_max_bpo_relocs;
1939 break;
1940
1941 case R_MMIX_PUSHJ_STUBBABLE:
1942 mmix_elf_section_data (sec)->pjs.n_pushj_relocs++;
1943 break;
1944 }
1945 }
1946
1947 /* Allocate per-reloc stub storage and initialize it to the max stub
1948 size. */
1949 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0)
1950 {
1951 size_t i;
1952
1953 mmix_elf_section_data (sec)->pjs.stub_size
1954 = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs
1955 * sizeof (mmix_elf_section_data (sec)
1956 ->pjs.stub_size[0]));
1957 if (mmix_elf_section_data (sec)->pjs.stub_size == NULL)
1958 return FALSE;
1959
1960 for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++)
1961 mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE;
1962 }
1963
1964 return TRUE;
1965 }
1966
1967 /* Look through the relocs for a section during the first phase. */
1968
1969 static bfd_boolean
1970 mmix_elf_check_relocs (abfd, info, sec, relocs)
1971 bfd *abfd;
1972 struct bfd_link_info *info;
1973 asection *sec;
1974 const Elf_Internal_Rela *relocs;
1975 {
1976 Elf_Internal_Shdr *symtab_hdr;
1977 struct elf_link_hash_entry **sym_hashes;
1978 const Elf_Internal_Rela *rel;
1979 const Elf_Internal_Rela *rel_end;
1980
1981 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1982 sym_hashes = elf_sym_hashes (abfd);
1983
1984 /* First we sort the relocs so that any register relocs come before
1985 expansion-relocs to the same insn. FIXME: Not done for mmo. */
1986 qsort ((PTR) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
1987 mmix_elf_sort_relocs);
1988
1989 /* Do the common part. */
1990 if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs))
1991 return FALSE;
1992
1993 if (info->relocatable)
1994 return TRUE;
1995
1996 rel_end = relocs + sec->reloc_count;
1997 for (rel = relocs; rel < rel_end; rel++)
1998 {
1999 struct elf_link_hash_entry *h;
2000 unsigned long r_symndx;
2001
2002 r_symndx = ELF64_R_SYM (rel->r_info);
2003 if (r_symndx < symtab_hdr->sh_info)
2004 h = NULL;
2005 else
2006 {
2007 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2008 while (h->root.type == bfd_link_hash_indirect
2009 || h->root.type == bfd_link_hash_warning)
2010 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2011 }
2012
2013 switch (ELF64_R_TYPE (rel->r_info))
2014 {
2015 /* This relocation describes the C++ object vtable hierarchy.
2016 Reconstruct it for later use during GC. */
2017 case R_MMIX_GNU_VTINHERIT:
2018 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2019 return FALSE;
2020 break;
2021
2022 /* This relocation describes which C++ vtable entries are actually
2023 used. Record for later use during GC. */
2024 case R_MMIX_GNU_VTENTRY:
2025 BFD_ASSERT (h != NULL);
2026 if (h != NULL
2027 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2028 return FALSE;
2029 break;
2030 }
2031 }
2032
2033 return TRUE;
2034 }
2035
2036 /* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo.
2037 Copied from elf_link_add_object_symbols. */
2038
2039 bfd_boolean
2040 _bfd_mmix_check_all_relocs (abfd, info)
2041 bfd *abfd;
2042 struct bfd_link_info *info;
2043 {
2044 asection *o;
2045
2046 for (o = abfd->sections; o != NULL; o = o->next)
2047 {
2048 Elf_Internal_Rela *internal_relocs;
2049 bfd_boolean ok;
2050
2051 if ((o->flags & SEC_RELOC) == 0
2052 || o->reloc_count == 0
2053 || ((info->strip == strip_all || info->strip == strip_debugger)
2054 && (o->flags & SEC_DEBUGGING) != 0)
2055 || bfd_is_abs_section (o->output_section))
2056 continue;
2057
2058 internal_relocs
2059 = _bfd_elf_link_read_relocs (abfd, o, (PTR) NULL,
2060 (Elf_Internal_Rela *) NULL,
2061 info->keep_memory);
2062 if (internal_relocs == NULL)
2063 return FALSE;
2064
2065 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs);
2066
2067 if (! info->keep_memory)
2068 free (internal_relocs);
2069
2070 if (! ok)
2071 return FALSE;
2072 }
2073
2074 return TRUE;
2075 }
2076 \f
2077 /* Change symbols relative to the reg contents section to instead be to
2078 the register section, and scale them down to correspond to the register
2079 number. */
2080
2081 static int
2082 mmix_elf_link_output_symbol_hook (info, name, sym, input_sec, h)
2083 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2084 const char *name ATTRIBUTE_UNUSED;
2085 Elf_Internal_Sym *sym;
2086 asection *input_sec;
2087 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED;
2088 {
2089 if (input_sec != NULL
2090 && input_sec->name != NULL
2091 && ELF_ST_TYPE (sym->st_info) != STT_SECTION
2092 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0)
2093 {
2094 sym->st_value /= 8;
2095 sym->st_shndx = SHN_REGISTER;
2096 }
2097
2098 return 1;
2099 }
2100
2101 /* We fake a register section that holds values that are register numbers.
2102 Having a SHN_REGISTER and register section translates better to other
2103 formats (e.g. mmo) than for example a STT_REGISTER attribute.
2104 This section faking is based on a construct in elf32-mips.c. */
2105 static asection mmix_elf_reg_section;
2106 static asymbol mmix_elf_reg_section_symbol;
2107 static asymbol *mmix_elf_reg_section_symbol_ptr;
2108
2109 /* Handle the special section numbers that a symbol may use. */
2110
2111 void
2112 mmix_elf_symbol_processing (abfd, asym)
2113 bfd *abfd ATTRIBUTE_UNUSED;
2114 asymbol *asym;
2115 {
2116 elf_symbol_type *elfsym;
2117
2118 elfsym = (elf_symbol_type *) asym;
2119 switch (elfsym->internal_elf_sym.st_shndx)
2120 {
2121 case SHN_REGISTER:
2122 if (mmix_elf_reg_section.name == NULL)
2123 {
2124 /* Initialize the register section. */
2125 mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME;
2126 mmix_elf_reg_section.flags = SEC_NO_FLAGS;
2127 mmix_elf_reg_section.output_section = &mmix_elf_reg_section;
2128 mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol;
2129 mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr;
2130 mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME;
2131 mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM;
2132 mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section;
2133 mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol;
2134 }
2135 asym->section = &mmix_elf_reg_section;
2136 break;
2137
2138 default:
2139 break;
2140 }
2141 }
2142
2143 /* Given a BFD section, try to locate the corresponding ELF section
2144 index. */
2145
2146 static bfd_boolean
2147 mmix_elf_section_from_bfd_section (abfd, sec, retval)
2148 bfd * abfd ATTRIBUTE_UNUSED;
2149 asection * sec;
2150 int * retval;
2151 {
2152 if (strcmp (bfd_get_section_name (abfd, sec), MMIX_REG_SECTION_NAME) == 0)
2153 *retval = SHN_REGISTER;
2154 else
2155 return FALSE;
2156
2157 return TRUE;
2158 }
2159
2160 /* Hook called by the linker routine which adds symbols from an object
2161 file. We must handle the special SHN_REGISTER section number here.
2162
2163 We also check that we only have *one* each of the section-start
2164 symbols, since otherwise having two with the same value would cause
2165 them to be "merged", but with the contents serialized. */
2166
2167 bfd_boolean
2168 mmix_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp)
2169 bfd *abfd;
2170 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2171 Elf_Internal_Sym *sym;
2172 const char **namep ATTRIBUTE_UNUSED;
2173 flagword *flagsp ATTRIBUTE_UNUSED;
2174 asection **secp;
2175 bfd_vma *valp ATTRIBUTE_UNUSED;
2176 {
2177 if (sym->st_shndx == SHN_REGISTER)
2178 {
2179 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME);
2180 (*secp)->flags |= SEC_LINKER_CREATED;
2181 }
2182 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.'
2183 && CONST_STRNEQ (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX))
2184 {
2185 /* See if we have another one. */
2186 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash,
2187 *namep,
2188 FALSE,
2189 FALSE,
2190 FALSE);
2191
2192 if (h != NULL && h->type != bfd_link_hash_undefined)
2193 {
2194 /* How do we get the asymbol (or really: the filename) from h?
2195 h->u.def.section->owner is NULL. */
2196 ((*_bfd_error_handler)
2197 (_("%s: Error: multiple definition of `%s'; start of %s is set in a earlier linked file\n"),
2198 bfd_get_filename (abfd), *namep,
2199 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)));
2200 bfd_set_error (bfd_error_bad_value);
2201 return FALSE;
2202 }
2203 }
2204
2205 return TRUE;
2206 }
2207
2208 /* We consider symbols matching "L.*:[0-9]+" to be local symbols. */
2209
2210 bfd_boolean
2211 mmix_elf_is_local_label_name (abfd, name)
2212 bfd *abfd;
2213 const char *name;
2214 {
2215 const char *colpos;
2216 int digits;
2217
2218 /* Also include the default local-label definition. */
2219 if (_bfd_elf_is_local_label_name (abfd, name))
2220 return TRUE;
2221
2222 if (*name != 'L')
2223 return FALSE;
2224
2225 /* If there's no ":", or more than one, it's not a local symbol. */
2226 colpos = strchr (name, ':');
2227 if (colpos == NULL || strchr (colpos + 1, ':') != NULL)
2228 return FALSE;
2229
2230 /* Check that there are remaining characters and that they are digits. */
2231 if (colpos[1] == 0)
2232 return FALSE;
2233
2234 digits = strspn (colpos + 1, "0123456789");
2235 return digits != 0 && colpos[1 + digits] == 0;
2236 }
2237
2238 /* We get rid of the register section here. */
2239
2240 bfd_boolean
2241 mmix_elf_final_link (abfd, info)
2242 bfd *abfd;
2243 struct bfd_link_info *info;
2244 {
2245 /* We never output a register section, though we create one for
2246 temporary measures. Check that nobody entered contents into it. */
2247 asection *reg_section;
2248
2249 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME);
2250
2251 if (reg_section != NULL)
2252 {
2253 /* FIXME: Pass error state gracefully. */
2254 if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS)
2255 _bfd_abort (__FILE__, __LINE__, _("Register section has contents\n"));
2256
2257 /* Really remove the section, if it hasn't already been done. */
2258 if (!bfd_section_removed_from_list (abfd, reg_section))
2259 {
2260 bfd_section_list_remove (abfd, reg_section);
2261 --abfd->section_count;
2262 }
2263 }
2264
2265 if (! bfd_elf_final_link (abfd, info))
2266 return FALSE;
2267
2268 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by
2269 the regular linker machinery. We do it here, like other targets with
2270 special sections. */
2271 if (info->base_file != NULL)
2272 {
2273 asection *greg_section
2274 = bfd_get_section_by_name ((bfd *) info->base_file,
2275 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2276 if (!bfd_set_section_contents (abfd,
2277 greg_section->output_section,
2278 greg_section->contents,
2279 (file_ptr) greg_section->output_offset,
2280 greg_section->size))
2281 return FALSE;
2282 }
2283 return TRUE;
2284 }
2285
2286 /* We need to include the maximum size of PUSHJ-stubs in the initial
2287 section size. This is expected to shrink during linker relaxation. */
2288
2289 static void
2290 mmix_set_relaxable_size (abfd, sec, ptr)
2291 bfd *abfd ATTRIBUTE_UNUSED;
2292 asection *sec;
2293 void *ptr;
2294 {
2295 struct bfd_link_info *info = ptr;
2296
2297 /* Make sure we only do this for section where we know we want this,
2298 otherwise we might end up resetting the size of COMMONs. */
2299 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)
2300 return;
2301
2302 sec->rawsize = sec->size;
2303 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs
2304 * MAX_PUSHJ_STUB_SIZE);
2305
2306 /* For use in relocatable link, we start with a max stubs size. See
2307 mmix_elf_relax_section. */
2308 if (info->relocatable && sec->output_section)
2309 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum
2310 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs
2311 * MAX_PUSHJ_STUB_SIZE);
2312 }
2313
2314 /* Initialize stuff for the linker-generated GREGs to match
2315 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */
2316
2317 bfd_boolean
2318 _bfd_mmix_before_linker_allocation (abfd, info)
2319 bfd *abfd ATTRIBUTE_UNUSED;
2320 struct bfd_link_info *info;
2321 {
2322 asection *bpo_gregs_section;
2323 bfd *bpo_greg_owner;
2324 struct bpo_greg_section_info *gregdata;
2325 size_t n_gregs;
2326 bfd_vma gregs_size;
2327 size_t i;
2328 size_t *bpo_reloc_indexes;
2329 bfd *ibfd;
2330
2331 /* Set the initial size of sections. */
2332 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2333 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info);
2334
2335 /* The bpo_greg_owner bfd is supposed to have been set by
2336 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen.
2337 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */
2338 bpo_greg_owner = (bfd *) info->base_file;
2339 if (bpo_greg_owner == NULL)
2340 return TRUE;
2341
2342 bpo_gregs_section
2343 = bfd_get_section_by_name (bpo_greg_owner,
2344 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2345
2346 if (bpo_gregs_section == NULL)
2347 return TRUE;
2348
2349 /* We use the target-data handle in the ELF section data. */
2350 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
2351 if (gregdata == NULL)
2352 return FALSE;
2353
2354 n_gregs = gregdata->n_bpo_relocs;
2355 gregdata->n_allocated_bpo_gregs = n_gregs;
2356
2357 /* When this reaches zero during relaxation, all entries have been
2358 filled in and the size of the linker gregs can be calculated. */
2359 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs;
2360
2361 /* Set the zeroth-order estimate for the GREGs size. */
2362 gregs_size = n_gregs * 8;
2363
2364 if (!bfd_set_section_size (bpo_greg_owner, bpo_gregs_section, gregs_size))
2365 return FALSE;
2366
2367 /* Allocate and set up the GREG arrays. They're filled in at relaxation
2368 time. Note that we must use the max number ever noted for the array,
2369 since the index numbers were created before GC. */
2370 gregdata->reloc_request
2371 = bfd_zalloc (bpo_greg_owner,
2372 sizeof (struct bpo_reloc_request)
2373 * gregdata->n_max_bpo_relocs);
2374
2375 gregdata->bpo_reloc_indexes
2376 = bpo_reloc_indexes
2377 = bfd_alloc (bpo_greg_owner,
2378 gregdata->n_max_bpo_relocs
2379 * sizeof (size_t));
2380 if (bpo_reloc_indexes == NULL)
2381 return FALSE;
2382
2383 /* The default order is an identity mapping. */
2384 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2385 {
2386 bpo_reloc_indexes[i] = i;
2387 gregdata->reloc_request[i].bpo_reloc_no = i;
2388 }
2389
2390 return TRUE;
2391 }
2392 \f
2393 /* Fill in contents in the linker allocated gregs. Everything is
2394 calculated at this point; we just move the contents into place here. */
2395
2396 bfd_boolean
2397 _bfd_mmix_after_linker_allocation (abfd, link_info)
2398 bfd *abfd ATTRIBUTE_UNUSED;
2399 struct bfd_link_info *link_info;
2400 {
2401 asection *bpo_gregs_section;
2402 bfd *bpo_greg_owner;
2403 struct bpo_greg_section_info *gregdata;
2404 size_t n_gregs;
2405 size_t i, j;
2406 size_t lastreg;
2407 bfd_byte *contents;
2408
2409 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs
2410 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such
2411 object, there was no R_MMIX_BASE_PLUS_OFFSET. */
2412 bpo_greg_owner = (bfd *) link_info->base_file;
2413 if (bpo_greg_owner == NULL)
2414 return TRUE;
2415
2416 bpo_gregs_section
2417 = bfd_get_section_by_name (bpo_greg_owner,
2418 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2419
2420 /* This can't happen without DSO handling. When DSOs are handled
2421 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such
2422 section. */
2423 if (bpo_gregs_section == NULL)
2424 return TRUE;
2425
2426 /* We use the target-data handle in the ELF section data. */
2427
2428 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
2429 if (gregdata == NULL)
2430 return FALSE;
2431
2432 n_gregs = gregdata->n_allocated_bpo_gregs;
2433
2434 bpo_gregs_section->contents
2435 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size);
2436 if (contents == NULL)
2437 return FALSE;
2438
2439 /* Sanity check: If these numbers mismatch, some relocation has not been
2440 accounted for and the rest of gregdata is probably inconsistent.
2441 It's a bug, but it's more helpful to identify it than segfaulting
2442 below. */
2443 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round
2444 != gregdata->n_bpo_relocs)
2445 {
2446 (*_bfd_error_handler)
2447 (_("Internal inconsistency: remaining %u != max %u.\n\
2448 Please report this bug."),
2449 gregdata->n_remaining_bpo_relocs_this_relaxation_round,
2450 gregdata->n_bpo_relocs);
2451 return FALSE;
2452 }
2453
2454 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++)
2455 if (gregdata->reloc_request[i].regindex != lastreg)
2456 {
2457 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value,
2458 contents + j * 8);
2459 lastreg = gregdata->reloc_request[i].regindex;
2460 j++;
2461 }
2462
2463 return TRUE;
2464 }
2465
2466 /* Sort valid relocs to come before non-valid relocs, then on increasing
2467 value. */
2468
2469 static int
2470 bpo_reloc_request_sort_fn (p1, p2)
2471 const PTR p1;
2472 const PTR p2;
2473 {
2474 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1;
2475 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2;
2476
2477 /* Primary function is validity; non-valid relocs sorted after valid
2478 ones. */
2479 if (r1->valid != r2->valid)
2480 return r2->valid - r1->valid;
2481
2482 /* Then sort on value. Don't simplify and return just the difference of
2483 the values: the upper bits of the 64-bit value would be truncated on
2484 a host with 32-bit ints. */
2485 if (r1->value != r2->value)
2486 return r1->value > r2->value ? 1 : -1;
2487
2488 /* As a last re-sort, use the relocation number, so we get a stable
2489 sort. The *addresses* aren't stable since items are swapped during
2490 sorting. It depends on the qsort implementation if this actually
2491 happens. */
2492 return r1->bpo_reloc_no > r2->bpo_reloc_no
2493 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0);
2494 }
2495
2496 /* For debug use only. Dumps the global register allocations resulting
2497 from base-plus-offset relocs. */
2498
2499 void
2500 mmix_dump_bpo_gregs (link_info, pf)
2501 struct bfd_link_info *link_info;
2502 bfd_error_handler_type pf;
2503 {
2504 bfd *bpo_greg_owner;
2505 asection *bpo_gregs_section;
2506 struct bpo_greg_section_info *gregdata;
2507 unsigned int i;
2508
2509 if (link_info == NULL || link_info->base_file == NULL)
2510 return;
2511
2512 bpo_greg_owner = (bfd *) link_info->base_file;
2513
2514 bpo_gregs_section
2515 = bfd_get_section_by_name (bpo_greg_owner,
2516 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2517
2518 if (bpo_gregs_section == NULL)
2519 return;
2520
2521 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
2522 if (gregdata == NULL)
2523 return;
2524
2525 if (pf == NULL)
2526 pf = _bfd_error_handler;
2527
2528 /* These format strings are not translated. They are for debug purposes
2529 only and never displayed to an end user. Should they escape, we
2530 surely want them in original. */
2531 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\
2532 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs,
2533 gregdata->n_max_bpo_relocs,
2534 gregdata->n_remaining_bpo_relocs_this_relaxation_round,
2535 gregdata->n_allocated_bpo_gregs);
2536
2537 if (gregdata->reloc_request)
2538 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2539 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n",
2540 i,
2541 (gregdata->bpo_reloc_indexes != NULL
2542 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1),
2543 gregdata->reloc_request[i].bpo_reloc_no,
2544 gregdata->reloc_request[i].valid,
2545
2546 (unsigned long) (gregdata->reloc_request[i].value >> 32),
2547 (unsigned long) gregdata->reloc_request[i].value,
2548 gregdata->reloc_request[i].regindex,
2549 gregdata->reloc_request[i].offset);
2550 }
2551
2552 /* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and
2553 when the last such reloc is done, an index-array is sorted according to
2554 the values and iterated over to produce register numbers (indexed by 0
2555 from the first allocated register number) and offsets for use in real
2556 relocation. (N.B.: Relocatable runs are handled, not just punted.)
2557
2558 PUSHJ stub accounting is also done here.
2559
2560 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
2561
2562 static bfd_boolean
2563 mmix_elf_relax_section (abfd, sec, link_info, again)
2564 bfd *abfd;
2565 asection *sec;
2566 struct bfd_link_info *link_info;
2567 bfd_boolean *again;
2568 {
2569 Elf_Internal_Shdr *symtab_hdr;
2570 Elf_Internal_Rela *internal_relocs;
2571 Elf_Internal_Rela *irel, *irelend;
2572 asection *bpo_gregs_section = NULL;
2573 struct bpo_greg_section_info *gregdata;
2574 struct bpo_reloc_section_info *bpodata
2575 = mmix_elf_section_data (sec)->bpo.reloc;
2576 /* The initialization is to quiet compiler warnings. The value is to
2577 spot a missing actual initialization. */
2578 size_t bpono = (size_t) -1;
2579 size_t pjsno = 0;
2580 Elf_Internal_Sym *isymbuf = NULL;
2581 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size;
2582
2583 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0;
2584
2585 /* Assume nothing changes. */
2586 *again = FALSE;
2587
2588 /* We don't have to do anything if this section does not have relocs, or
2589 if this is not a code section. */
2590 if ((sec->flags & SEC_RELOC) == 0
2591 || sec->reloc_count == 0
2592 || (sec->flags & SEC_CODE) == 0
2593 || (sec->flags & SEC_LINKER_CREATED) != 0
2594 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs,
2595 then nothing to do. */
2596 || (bpodata == NULL
2597 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0))
2598 return TRUE;
2599
2600 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2601
2602 if (bpodata != NULL)
2603 {
2604 bpo_gregs_section = bpodata->bpo_greg_section;
2605 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
2606 bpono = bpodata->first_base_plus_offset_reloc;
2607 }
2608 else
2609 gregdata = NULL;
2610
2611 /* Get a copy of the native relocations. */
2612 internal_relocs
2613 = _bfd_elf_link_read_relocs (abfd, sec, (PTR) NULL,
2614 (Elf_Internal_Rela *) NULL,
2615 link_info->keep_memory);
2616 if (internal_relocs == NULL)
2617 goto error_return;
2618
2619 /* Walk through them looking for relaxing opportunities. */
2620 irelend = internal_relocs + sec->reloc_count;
2621 for (irel = internal_relocs; irel < irelend; irel++)
2622 {
2623 bfd_vma symval;
2624 struct elf_link_hash_entry *h = NULL;
2625
2626 /* We only process two relocs. */
2627 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET
2628 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE)
2629 continue;
2630
2631 /* We process relocs in a distinctly different way when this is a
2632 relocatable link (for one, we don't look at symbols), so we avoid
2633 mixing its code with that for the "normal" relaxation. */
2634 if (link_info->relocatable)
2635 {
2636 /* The only transformation in a relocatable link is to generate
2637 a full stub at the location of the stub calculated for the
2638 input section, if the relocated stub location, the end of the
2639 output section plus earlier stubs, cannot be reached. Thus
2640 relocatable linking can only lead to worse code, but it still
2641 works. */
2642 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE)
2643 {
2644 /* If we can reach the end of the output-section and beyond
2645 any current stubs, then we don't need a stub for this
2646 reloc. The relaxed order of output stub allocation may
2647 not exactly match the straightforward order, so we always
2648 assume presence of output stubs, which will allow
2649 relaxation only on relocations indifferent to the
2650 presence of output stub allocations for other relocations
2651 and thus the order of output stub allocation. */
2652 if (bfd_check_overflow (complain_overflow_signed,
2653 19,
2654 0,
2655 bfd_arch_bits_per_address (abfd),
2656 /* Output-stub location. */
2657 sec->output_section->rawsize
2658 + (mmix_elf_section_data (sec
2659 ->output_section)
2660 ->pjs.stubs_size_sum)
2661 /* Location of this PUSHJ reloc. */
2662 - (sec->output_offset + irel->r_offset)
2663 /* Don't count *this* stub twice. */
2664 - (mmix_elf_section_data (sec)
2665 ->pjs.stub_size[pjsno]
2666 + MAX_PUSHJ_STUB_SIZE))
2667 == bfd_reloc_ok)
2668 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0;
2669
2670 mmix_elf_section_data (sec)->pjs.stubs_size_sum
2671 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno];
2672
2673 pjsno++;
2674 }
2675
2676 continue;
2677 }
2678
2679 /* Get the value of the symbol referred to by the reloc. */
2680 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2681 {
2682 /* A local symbol. */
2683 Elf_Internal_Sym *isym;
2684 asection *sym_sec;
2685
2686 /* Read this BFD's local symbols if we haven't already. */
2687 if (isymbuf == NULL)
2688 {
2689 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2690 if (isymbuf == NULL)
2691 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2692 symtab_hdr->sh_info, 0,
2693 NULL, NULL, NULL);
2694 if (isymbuf == 0)
2695 goto error_return;
2696 }
2697
2698 isym = isymbuf + ELF64_R_SYM (irel->r_info);
2699 if (isym->st_shndx == SHN_UNDEF)
2700 sym_sec = bfd_und_section_ptr;
2701 else if (isym->st_shndx == SHN_ABS)
2702 sym_sec = bfd_abs_section_ptr;
2703 else if (isym->st_shndx == SHN_COMMON)
2704 sym_sec = bfd_com_section_ptr;
2705 else
2706 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2707 symval = (isym->st_value
2708 + sym_sec->output_section->vma
2709 + sym_sec->output_offset);
2710 }
2711 else
2712 {
2713 unsigned long indx;
2714
2715 /* An external symbol. */
2716 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2717 h = elf_sym_hashes (abfd)[indx];
2718 BFD_ASSERT (h != NULL);
2719 if (h->root.type != bfd_link_hash_defined
2720 && h->root.type != bfd_link_hash_defweak)
2721 {
2722 /* This appears to be a reference to an undefined symbol. Just
2723 ignore it--it will be caught by the regular reloc processing.
2724 We need to keep BPO reloc accounting consistent, though
2725 else we'll abort instead of emitting an error message. */
2726 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET
2727 && gregdata != NULL)
2728 {
2729 gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
2730 bpono++;
2731 }
2732 continue;
2733 }
2734
2735 symval = (h->root.u.def.value
2736 + h->root.u.def.section->output_section->vma
2737 + h->root.u.def.section->output_offset);
2738 }
2739
2740 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE)
2741 {
2742 bfd_vma value = symval + irel->r_addend;
2743 bfd_vma dot
2744 = (sec->output_section->vma
2745 + sec->output_offset
2746 + irel->r_offset);
2747 bfd_vma stubaddr
2748 = (sec->output_section->vma
2749 + sec->output_offset
2750 + size
2751 + mmix_elf_section_data (sec)->pjs.stubs_size_sum);
2752
2753 if ((value & 3) == 0
2754 && bfd_check_overflow (complain_overflow_signed,
2755 19,
2756 0,
2757 bfd_arch_bits_per_address (abfd),
2758 value - dot
2759 - (value > dot
2760 ? mmix_elf_section_data (sec)
2761 ->pjs.stub_size[pjsno]
2762 : 0))
2763 == bfd_reloc_ok)
2764 /* If the reloc fits, no stub is needed. */
2765 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0;
2766 else
2767 /* Maybe we can get away with just a JMP insn? */
2768 if ((value & 3) == 0
2769 && bfd_check_overflow (complain_overflow_signed,
2770 27,
2771 0,
2772 bfd_arch_bits_per_address (abfd),
2773 value - stubaddr
2774 - (value > dot
2775 ? mmix_elf_section_data (sec)
2776 ->pjs.stub_size[pjsno] - 4
2777 : 0))
2778 == bfd_reloc_ok)
2779 /* Yep, account for a stub consisting of a single JMP insn. */
2780 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4;
2781 else
2782 /* Nope, go for the full insn stub. It doesn't seem useful to
2783 emit the intermediate sizes; those will only be useful for
2784 a >64M program assuming contiguous code. */
2785 mmix_elf_section_data (sec)->pjs.stub_size[pjsno]
2786 = MAX_PUSHJ_STUB_SIZE;
2787
2788 mmix_elf_section_data (sec)->pjs.stubs_size_sum
2789 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno];
2790 pjsno++;
2791 continue;
2792 }
2793
2794 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */
2795
2796 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value
2797 = symval + irel->r_addend;
2798 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE;
2799 gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
2800 }
2801
2802 /* Check if that was the last BPO-reloc. If so, sort the values and
2803 calculate how many registers we need to cover them. Set the size of
2804 the linker gregs, and if the number of registers changed, indicate
2805 that we need to relax some more because we have more work to do. */
2806 if (gregdata != NULL
2807 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0)
2808 {
2809 size_t i;
2810 bfd_vma prev_base;
2811 size_t regindex;
2812
2813 /* First, reset the remaining relocs for the next round. */
2814 gregdata->n_remaining_bpo_relocs_this_relaxation_round
2815 = gregdata->n_bpo_relocs;
2816
2817 qsort ((PTR) gregdata->reloc_request,
2818 gregdata->n_max_bpo_relocs,
2819 sizeof (struct bpo_reloc_request),
2820 bpo_reloc_request_sort_fn);
2821
2822 /* Recalculate indexes. When we find a change (however unlikely
2823 after the initial iteration), we know we need to relax again,
2824 since items in the GREG-array are sorted by increasing value and
2825 stored in the relaxation phase. */
2826 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2827 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
2828 != i)
2829 {
2830 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
2831 = i;
2832 *again = TRUE;
2833 }
2834
2835 /* Allocate register numbers (indexing from 0). Stop at the first
2836 non-valid reloc. */
2837 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value;
2838 i < gregdata->n_bpo_relocs;
2839 i++)
2840 {
2841 if (gregdata->reloc_request[i].value > prev_base + 255)
2842 {
2843 regindex++;
2844 prev_base = gregdata->reloc_request[i].value;
2845 }
2846 gregdata->reloc_request[i].regindex = regindex;
2847 gregdata->reloc_request[i].offset
2848 = gregdata->reloc_request[i].value - prev_base;
2849 }
2850
2851 /* If it's not the same as the last time, we need to relax again,
2852 because the size of the section has changed. I'm not sure we
2853 actually need to do any adjustments since the shrinking happens
2854 at the start of this section, but better safe than sorry. */
2855 if (gregdata->n_allocated_bpo_gregs != regindex + 1)
2856 {
2857 gregdata->n_allocated_bpo_gregs = regindex + 1;
2858 *again = TRUE;
2859 }
2860
2861 bpo_gregs_section->size = (regindex + 1) * 8;
2862 }
2863
2864 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
2865 {
2866 if (! link_info->keep_memory)
2867 free (isymbuf);
2868 else
2869 {
2870 /* Cache the symbols for elf_link_input_bfd. */
2871 symtab_hdr->contents = (unsigned char *) isymbuf;
2872 }
2873 }
2874
2875 if (internal_relocs != NULL
2876 && elf_section_data (sec)->relocs != internal_relocs)
2877 free (internal_relocs);
2878
2879 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum)
2880 abort ();
2881
2882 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum)
2883 {
2884 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum;
2885 *again = TRUE;
2886 }
2887
2888 return TRUE;
2889
2890 error_return:
2891 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
2892 free (isymbuf);
2893 if (internal_relocs != NULL
2894 && elf_section_data (sec)->relocs != internal_relocs)
2895 free (internal_relocs);
2896 return FALSE;
2897 }
2898 \f
2899 #define ELF_ARCH bfd_arch_mmix
2900 #define ELF_MACHINE_CODE EM_MMIX
2901
2902 /* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL).
2903 However, that's too much for something somewhere in the linker part of
2904 BFD; perhaps the start-address has to be a non-zero multiple of this
2905 number, or larger than this number. The symptom is that the linker
2906 complains: "warning: allocated section `.text' not in segment". We
2907 settle for 64k; the page-size used in examples is 8k.
2908 #define ELF_MAXPAGESIZE 0x10000
2909
2910 Unfortunately, this causes excessive padding in the supposedly small
2911 for-education programs that are the expected usage (where people would
2912 inspect output). We stick to 256 bytes just to have *some* default
2913 alignment. */
2914 #define ELF_MAXPAGESIZE 0x100
2915
2916 #define TARGET_BIG_SYM bfd_elf64_mmix_vec
2917 #define TARGET_BIG_NAME "elf64-mmix"
2918
2919 #define elf_info_to_howto_rel NULL
2920 #define elf_info_to_howto mmix_info_to_howto_rela
2921 #define elf_backend_relocate_section mmix_elf_relocate_section
2922 #define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook
2923 #define elf_backend_gc_sweep_hook mmix_elf_gc_sweep_hook
2924
2925 #define elf_backend_link_output_symbol_hook \
2926 mmix_elf_link_output_symbol_hook
2927 #define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook
2928
2929 #define elf_backend_check_relocs mmix_elf_check_relocs
2930 #define elf_backend_symbol_processing mmix_elf_symbol_processing
2931 #define elf_backend_omit_section_dynsym \
2932 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
2933
2934 #define bfd_elf64_bfd_is_local_label_name \
2935 mmix_elf_is_local_label_name
2936
2937 #define elf_backend_may_use_rel_p 0
2938 #define elf_backend_may_use_rela_p 1
2939 #define elf_backend_default_use_rela_p 1
2940
2941 #define elf_backend_can_gc_sections 1
2942 #define elf_backend_section_from_bfd_section \
2943 mmix_elf_section_from_bfd_section
2944
2945 #define bfd_elf64_new_section_hook mmix_elf_new_section_hook
2946 #define bfd_elf64_bfd_final_link mmix_elf_final_link
2947 #define bfd_elf64_bfd_relax_section mmix_elf_relax_section
2948
2949 #include "elf64-target.h"
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