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[deliverable/binutils-gdb.git] / bfd / elf64-mmix.c
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3c3bdf30 1/* MMIX-specific support for 64-bit ELF.
4b95cf5c 2 Copyright (C) 2001-2014 Free Software Foundation, Inc.
3c3bdf30
NC		 3 Contributed by Hans-Peter Nilsson <hp@bitrange.com>
4
cd123cb7 5 This file is part of BFD, the Binary File Descriptor library.
3c3bdf30 6
cd123cb7
NC		 7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
3c3bdf30 11
cd123cb7
NC		 12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
3c3bdf30 21
3c3bdf30
NC		 22
23/* No specific ABI or "processor-specific supplement" defined. */
24
25/* TODO:
f60ebe14
HPN		 26 - "Traditional" linker relaxation (shrinking whole sections).
27 - Merge reloc stubs jumping to same location.
28 - GETA stub relaxation (call a stub for out of range new
29 R_MMIX_GETA_STUBBABLE). */
3c3bdf30 30
3c3bdf30 31#include "sysdep.h"
3db64b00 32#include "bfd.h"
3c3bdf30
NC		 33#include "libbfd.h"
34#include "elf-bfd.h"
35#include "elf/mmix.h"
36#include "opcode/mmix.h"
37
38#define MINUS_ONE (((bfd_vma) 0) - 1)
39
f60ebe14
HPN		 40#define MAX_PUSHJ_STUB_SIZE (5 * 4)
41
3c3bdf30
NC		 42/* Put these everywhere in new code. */
43#define FATAL_DEBUG \
44 _bfd_abort (__FILE__, __LINE__, \
45 "Internal: Non-debugged code (test-case missing)")
46
47#define BAD_CASE(x) \
48 _bfd_abort (__FILE__, __LINE__, \
49 "bad case for " #x)
50
f0abc2a1
AM		 51struct _mmix_elf_section_data
52{
53 struct bfd_elf_section_data elf;
54 union
55 {
56 struct bpo_reloc_section_info *reloc;
57 struct bpo_greg_section_info *greg;
58 } bpo;
f60ebe14
HPN		 59
60 struct pushj_stub_info
61 {
62 /* Maximum number of stubs needed for this section. */
63 bfd_size_type n_pushj_relocs;
64
65 /* Size of stubs after a mmix_elf_relax_section round. */
66 bfd_size_type stubs_size_sum;
67
68 /* Per-reloc stubs_size_sum information. The stubs_size_sum member is the sum
69 of these. Allocated in mmix_elf_check_common_relocs. */
70 bfd_size_type *stub_size;
71
72 /* Offset of next stub during relocation. Somewhat redundant with the
73 above: error coverage is easier and we don't have to reset the
74 stubs_size_sum for relocation. */
75 bfd_size_type stub_offset;
76 } pjs;
18978b27
HPN		 77
78 /* Whether there has been a warning that this section could not be
79 linked due to a specific cause. FIXME: a way to access the
80 linker info or output section, then stuff the limiter guard
81 there. */
82 bfd_boolean has_warned_bpo;
83 bfd_boolean has_warned_pushj;
f0abc2a1
AM		 84};
85
86#define mmix_elf_section_data(sec) \
68bfbfcc 87 ((struct _mmix_elf_section_data *) elf_section_data (sec))
f0abc2a1 88
930b4cb2 89/* For each section containing a base-plus-offset (BPO) reloc, we attach
f0abc2a1 90 this struct as mmix_elf_section_data (section)->bpo, which is otherwise
930b4cb2
HPN		 91 NULL. */
92struct bpo_reloc_section_info
93 {
94 /* The base is 1; this is the first number in this section. */
95 size_t first_base_plus_offset_reloc;
96
97 /* Number of BPO-relocs in this section. */
98 size_t n_bpo_relocs_this_section;
99
100 /* Running index, used at relocation time. */
101 size_t bpo_index;
102
103 /* We don't have access to the bfd_link_info struct in
104 mmix_final_link_relocate. What we really want to get at is the
105 global single struct greg_relocation, so we stash it here. */
106 asection *bpo_greg_section;
107 };
108
109/* Helper struct (in global context) for the one below.
110 There's one of these created for every BPO reloc. */
111struct bpo_reloc_request
112 {
113 bfd_vma value;
114
115 /* Valid after relaxation. The base is 0; the first register number
116 must be added. The offset is in range 0..255. */
117 size_t regindex;
118 size_t offset;
119
120 /* The order number for this BPO reloc, corresponding to the order in
121 which BPO relocs were found. Used to create an index after reloc
122 requests are sorted. */
123 size_t bpo_reloc_no;
124
125 /* Set when the value is computed. Better than coding "guard values"
b34976b6 126 into the other members. Is FALSE only for BPO relocs in a GC:ed
930b4cb2 127 section. */
b34976b6 128 bfd_boolean valid;
930b4cb2
HPN		 129 };
130
f0abc2a1 131/* We attach this as mmix_elf_section_data (sec)->bpo in the linker-allocated
930b4cb2
HPN		 132 greg contents section (MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME),
133 which is linked into the register contents section
134 (MMIX_REG_CONTENTS_SECTION_NAME). This section is created by the
135 linker; using the same hook as for usual with BPO relocs does not
136 collide. */
137struct bpo_greg_section_info
138 {
139 /* After GC, this reflects the number of remaining, non-excluded
140 BPO-relocs. */
141 size_t n_bpo_relocs;
142
143 /* This is the number of allocated bpo_reloc_requests; the size of
144 sorted_indexes. Valid after the check.*relocs functions are called
145 for all incoming sections. It includes the number of BPO relocs in
146 sections that were GC:ed. */
147 size_t n_max_bpo_relocs;
148
149 /* A counter used to find out when to fold the BPO gregs, since we
150 don't have a single "after-relaxation" hook. */
151 size_t n_remaining_bpo_relocs_this_relaxation_round;
152
153 /* The number of linker-allocated GREGs resulting from BPO relocs.
f60ebe14
HPN		 154 This is an approximation after _bfd_mmix_before_linker_allocation
155 and supposedly accurate after mmix_elf_relax_section is called for
156 all incoming non-collected sections. */
930b4cb2
HPN		 157 size_t n_allocated_bpo_gregs;
158
159 /* Index into reloc_request[], sorted on increasing "value", secondary
160 by increasing index for strict sorting order. */
161 size_t *bpo_reloc_indexes;
162
163 /* An array of all relocations, with the "value" member filled in by
164 the relaxation function. */
165 struct bpo_reloc_request *reloc_request;
166 };
167
3c3bdf30 168
2c3fc389 169extern bfd_boolean mmix_elf_final_link (bfd *, struct bfd_link_info *);
3c3bdf30 170
2c3fc389 171extern void mmix_elf_symbol_processing (bfd *, asymbol *);
3c3bdf30 172
4fa5c2a8
HPN		 173/* Only intended to be called from a debugger. */
174extern void mmix_dump_bpo_gregs
2c3fc389 175 (struct bfd_link_info *, bfd_error_handler_type);
4fa5c2a8 176
f60ebe14 177static void
2c3fc389
NC		 178mmix_set_relaxable_size (bfd *, asection *, void *);
179static bfd_reloc_status_type
180mmix_elf_reloc (bfd *, arelent *, asymbol *, void *,
181 asection *, bfd *, char **);
182static bfd_reloc_status_type
183mmix_final_link_relocate (reloc_howto_type *, asection *, bfd_byte *, bfd_vma,
184 bfd_signed_vma, bfd_vma, const char *, asection *,
185 char **);
f60ebe14 186
f60ebe14 187
3c3bdf30
NC		 188/* Watch out: this currently needs to have elements with the same index as
189 their R_MMIX_ number. */
190static reloc_howto_type elf_mmix_howto_table[] =
191 {
192 /* This reloc does nothing. */
193 HOWTO (R_MMIX_NONE, /* type */
194 0, /* rightshift */
195 2, /* size (0 = byte, 1 = short, 2 = long) */
196 32, /* bitsize */
b34976b6 197 FALSE, /* pc_relative */
3c3bdf30
NC		 198 0, /* bitpos */
199 complain_overflow_bitfield, /* complain_on_overflow */
200 bfd_elf_generic_reloc, /* special_function */
201 "R_MMIX_NONE", /* name */
b34976b6 202 FALSE, /* partial_inplace */
3c3bdf30
NC		 203 0, /* src_mask */
204 0, /* dst_mask */
b34976b6 205 FALSE), /* pcrel_offset */
3c3bdf30
NC		 206
207 /* An 8 bit absolute relocation. */
208 HOWTO (R_MMIX_8, /* type */
209 0, /* rightshift */
210 0, /* size (0 = byte, 1 = short, 2 = long) */
211 8, /* bitsize */
b34976b6 212 FALSE, /* pc_relative */
3c3bdf30
NC		 213 0, /* bitpos */
214 complain_overflow_bitfield, /* complain_on_overflow */
215 bfd_elf_generic_reloc, /* special_function */
216 "R_MMIX_8", /* name */
b34976b6 217 FALSE, /* partial_inplace */
930b4cb2 218 0, /* src_mask */
3c3bdf30 219 0xff, /* dst_mask */
b34976b6 220 FALSE), /* pcrel_offset */
3c3bdf30
NC		 221
222 /* An 16 bit absolute relocation. */
223 HOWTO (R_MMIX_16, /* type */
224 0, /* rightshift */
225 1, /* size (0 = byte, 1 = short, 2 = long) */
226 16, /* bitsize */
b34976b6 227 FALSE, /* pc_relative */
3c3bdf30
NC		 228 0, /* bitpos */
229 complain_overflow_bitfield, /* complain_on_overflow */
230 bfd_elf_generic_reloc, /* special_function */
231 "R_MMIX_16", /* name */
b34976b6 232 FALSE, /* partial_inplace */
930b4cb2 233 0, /* src_mask */
3c3bdf30 234 0xffff, /* dst_mask */
b34976b6 235 FALSE), /* pcrel_offset */
3c3bdf30
NC		 236
237 /* An 24 bit absolute relocation. */
238 HOWTO (R_MMIX_24, /* type */
239 0, /* rightshift */
240 2, /* size (0 = byte, 1 = short, 2 = long) */
241 24, /* bitsize */
b34976b6 242 FALSE, /* pc_relative */
3c3bdf30
NC		 243 0, /* bitpos */
244 complain_overflow_bitfield, /* complain_on_overflow */
245 bfd_elf_generic_reloc, /* special_function */
246 "R_MMIX_24", /* name */
b34976b6 247 FALSE, /* partial_inplace */
930b4cb2 248 ~0xffffff, /* src_mask */
3c3bdf30 249 0xffffff, /* dst_mask */
b34976b6 250 FALSE), /* pcrel_offset */
3c3bdf30
NC		 251
252 /* A 32 bit absolute relocation. */
253 HOWTO (R_MMIX_32, /* type */
254 0, /* rightshift */
255 2, /* size (0 = byte, 1 = short, 2 = long) */
256 32, /* bitsize */
b34976b6 257 FALSE, /* pc_relative */
3c3bdf30
NC		 258 0, /* bitpos */
259 complain_overflow_bitfield, /* complain_on_overflow */
260 bfd_elf_generic_reloc, /* special_function */
261 "R_MMIX_32", /* name */
b34976b6 262 FALSE, /* partial_inplace */
930b4cb2 263 0, /* src_mask */
3c3bdf30 264 0xffffffff, /* dst_mask */
b34976b6 265 FALSE), /* pcrel_offset */
3c3bdf30
NC		 266
267 /* 64 bit relocation. */
268 HOWTO (R_MMIX_64, /* type */
269 0, /* rightshift */
270 4, /* size (0 = byte, 1 = short, 2 = long) */
271 64, /* bitsize */
b34976b6 272 FALSE, /* pc_relative */
3c3bdf30
NC		 273 0, /* bitpos */
274 complain_overflow_bitfield, /* complain_on_overflow */
275 bfd_elf_generic_reloc, /* special_function */
276 "R_MMIX_64", /* name */
b34976b6 277 FALSE, /* partial_inplace */
930b4cb2 278 0, /* src_mask */
3c3bdf30 279 MINUS_ONE, /* dst_mask */
b34976b6 280 FALSE), /* pcrel_offset */
3c3bdf30
NC		 281
282 /* An 8 bit PC-relative relocation. */
283 HOWTO (R_MMIX_PC_8, /* type */
284 0, /* rightshift */
285 0, /* size (0 = byte, 1 = short, 2 = long) */
286 8, /* bitsize */
b34976b6 287 TRUE, /* pc_relative */
3c3bdf30
NC		 288 0, /* bitpos */
289 complain_overflow_bitfield, /* complain_on_overflow */
290 bfd_elf_generic_reloc, /* special_function */
291 "R_MMIX_PC_8", /* name */
b34976b6 292 FALSE, /* partial_inplace */
930b4cb2 293 0, /* src_mask */
3c3bdf30 294 0xff, /* dst_mask */
b34976b6 295 TRUE), /* pcrel_offset */
3c3bdf30
NC		 296
297 /* An 16 bit PC-relative relocation. */
298 HOWTO (R_MMIX_PC_16, /* type */
299 0, /* rightshift */
300 1, /* size (0 = byte, 1 = short, 2 = long) */
301 16, /* bitsize */
b34976b6 302 TRUE, /* pc_relative */
3c3bdf30
NC		 303 0, /* bitpos */
304 complain_overflow_bitfield, /* complain_on_overflow */
305 bfd_elf_generic_reloc, /* special_function */
306 "R_MMIX_PC_16", /* name */
b34976b6 307 FALSE, /* partial_inplace */
930b4cb2 308 0, /* src_mask */
3c3bdf30 309 0xffff, /* dst_mask */
b34976b6 310 TRUE), /* pcrel_offset */
3c3bdf30
NC		 311
312 /* An 24 bit PC-relative relocation. */
313 HOWTO (R_MMIX_PC_24, /* type */
314 0, /* rightshift */
315 2, /* size (0 = byte, 1 = short, 2 = long) */
316 24, /* bitsize */
b34976b6 317 TRUE, /* pc_relative */
3c3bdf30
NC		 318 0, /* bitpos */
319 complain_overflow_bitfield, /* complain_on_overflow */
320 bfd_elf_generic_reloc, /* special_function */
321 "R_MMIX_PC_24", /* name */
b34976b6 322 FALSE, /* partial_inplace */
930b4cb2 323 ~0xffffff, /* src_mask */
3c3bdf30 324 0xffffff, /* dst_mask */
b34976b6 325 TRUE), /* pcrel_offset */
3c3bdf30
NC		 326
327 /* A 32 bit absolute PC-relative relocation. */
328 HOWTO (R_MMIX_PC_32, /* type */
329 0, /* rightshift */
330 2, /* size (0 = byte, 1 = short, 2 = long) */
331 32, /* bitsize */
b34976b6 332 TRUE, /* pc_relative */
3c3bdf30
NC		 333 0, /* bitpos */
334 complain_overflow_bitfield, /* complain_on_overflow */
335 bfd_elf_generic_reloc, /* special_function */
336 "R_MMIX_PC_32", /* name */
b34976b6 337 FALSE, /* partial_inplace */
930b4cb2 338 0, /* src_mask */
3c3bdf30 339 0xffffffff, /* dst_mask */
b34976b6 340 TRUE), /* pcrel_offset */
3c3bdf30
NC		 341
342 /* 64 bit PC-relative relocation. */
343 HOWTO (R_MMIX_PC_64, /* type */
344 0, /* rightshift */
345 4, /* size (0 = byte, 1 = short, 2 = long) */
346 64, /* bitsize */
b34976b6 347 TRUE, /* pc_relative */
3c3bdf30
NC		 348 0, /* bitpos */
349 complain_overflow_bitfield, /* complain_on_overflow */
350 bfd_elf_generic_reloc, /* special_function */
351 "R_MMIX_PC_64", /* name */
b34976b6 352 FALSE, /* partial_inplace */
930b4cb2 353 0, /* src_mask */
3c3bdf30 354 MINUS_ONE, /* dst_mask */
b34976b6 355 TRUE), /* pcrel_offset */
3c3bdf30
NC		 356
357 /* GNU extension to record C++ vtable hierarchy. */
358 HOWTO (R_MMIX_GNU_VTINHERIT, /* type */
359 0, /* rightshift */
360 0, /* size (0 = byte, 1 = short, 2 = long) */
361 0, /* bitsize */
b34976b6 362 FALSE, /* pc_relative */
3c3bdf30
NC		 363 0, /* bitpos */
364 complain_overflow_dont, /* complain_on_overflow */
365 NULL, /* special_function */
366 "R_MMIX_GNU_VTINHERIT", /* name */
b34976b6 367 FALSE, /* partial_inplace */
3c3bdf30
NC		 368 0, /* src_mask */
369 0, /* dst_mask */
b34976b6 370 TRUE), /* pcrel_offset */
3c3bdf30
NC		 371
372 /* GNU extension to record C++ vtable member usage. */
373 HOWTO (R_MMIX_GNU_VTENTRY, /* type */
374 0, /* rightshift */
375 0, /* size (0 = byte, 1 = short, 2 = long) */
376 0, /* bitsize */
b34976b6 377 FALSE, /* pc_relative */
3c3bdf30
NC		 378 0, /* bitpos */
379 complain_overflow_dont, /* complain_on_overflow */
380 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
381 "R_MMIX_GNU_VTENTRY", /* name */
b34976b6 382 FALSE, /* partial_inplace */
3c3bdf30
NC		 383 0, /* src_mask */
384 0, /* dst_mask */
b34976b6 385 FALSE), /* pcrel_offset */
3c3bdf30
NC		 386
387 /* The GETA relocation is supposed to get any address that could
388 possibly be reached by the GETA instruction. It can silently expand
389 to get a 64-bit operand, but will complain if any of the two least
390 significant bits are set. The howto members reflect a simple GETA. */
391 HOWTO (R_MMIX_GETA, /* type */
392 2, /* rightshift */
393 2, /* size (0 = byte, 1 = short, 2 = long) */
394 19, /* bitsize */
b34976b6 395 TRUE, /* pc_relative */
3c3bdf30
NC		 396 0, /* bitpos */
397 complain_overflow_signed, /* complain_on_overflow */
398 mmix_elf_reloc, /* special_function */
399 "R_MMIX_GETA", /* name */
b34976b6 400 FALSE, /* partial_inplace */
930b4cb2 401 ~0x0100ffff, /* src_mask */
3c3bdf30 402 0x0100ffff, /* dst_mask */
b34976b6 403 TRUE), /* pcrel_offset */
3c3bdf30
NC		 404
405 HOWTO (R_MMIX_GETA_1, /* type */
406 2, /* rightshift */
407 2, /* size (0 = byte, 1 = short, 2 = long) */
408 19, /* bitsize */
b34976b6 409 TRUE, /* pc_relative */
3c3bdf30
NC		 410 0, /* bitpos */
411 complain_overflow_signed, /* complain_on_overflow */
412 mmix_elf_reloc, /* special_function */
413 "R_MMIX_GETA_1", /* name */
b34976b6 414 FALSE, /* partial_inplace */
930b4cb2 415 ~0x0100ffff, /* src_mask */
3c3bdf30 416 0x0100ffff, /* dst_mask */
b34976b6 417 TRUE), /* pcrel_offset */
3c3bdf30
NC		 418
419 HOWTO (R_MMIX_GETA_2, /* type */
420 2, /* rightshift */
421 2, /* size (0 = byte, 1 = short, 2 = long) */
422 19, /* bitsize */
b34976b6 423 TRUE, /* pc_relative */
3c3bdf30
NC		 424 0, /* bitpos */
425 complain_overflow_signed, /* complain_on_overflow */
426 mmix_elf_reloc, /* special_function */
427 "R_MMIX_GETA_2", /* name */
b34976b6 428 FALSE, /* partial_inplace */
930b4cb2 429 ~0x0100ffff, /* src_mask */
3c3bdf30 430 0x0100ffff, /* dst_mask */
b34976b6 431 TRUE), /* pcrel_offset */
3c3bdf30
NC		 432
433 HOWTO (R_MMIX_GETA_3, /* type */
434 2, /* rightshift */
435 2, /* size (0 = byte, 1 = short, 2 = long) */
436 19, /* bitsize */
b34976b6 437 TRUE, /* pc_relative */
3c3bdf30
NC		 438 0, /* bitpos */
439 complain_overflow_signed, /* complain_on_overflow */
440 mmix_elf_reloc, /* special_function */
441 "R_MMIX_GETA_3", /* name */
b34976b6 442 FALSE, /* partial_inplace */
930b4cb2 443 ~0x0100ffff, /* src_mask */
3c3bdf30 444 0x0100ffff, /* dst_mask */
b34976b6 445 TRUE), /* pcrel_offset */
3c3bdf30
NC		 446
447 /* The conditional branches are supposed to reach any (code) address.
448 It can silently expand to a 64-bit operand, but will emit an error if
449 any of the two least significant bits are set. The howto members
450 reflect a simple branch. */
451 HOWTO (R_MMIX_CBRANCH, /* type */
452 2, /* rightshift */
453 2, /* size (0 = byte, 1 = short, 2 = long) */
454 19, /* bitsize */
b34976b6 455 TRUE, /* pc_relative */
3c3bdf30
NC		 456 0, /* bitpos */
457 complain_overflow_signed, /* complain_on_overflow */
458 mmix_elf_reloc, /* special_function */
459 "R_MMIX_CBRANCH", /* name */
b34976b6 460 FALSE, /* partial_inplace */
930b4cb2 461 ~0x0100ffff, /* src_mask */
3c3bdf30 462 0x0100ffff, /* dst_mask */
b34976b6 463 TRUE), /* pcrel_offset */
3c3bdf30
NC		 464
465 HOWTO (R_MMIX_CBRANCH_J, /* type */
466 2, /* rightshift */
467 2, /* size (0 = byte, 1 = short, 2 = long) */
468 19, /* bitsize */
b34976b6 469 TRUE, /* pc_relative */
3c3bdf30
NC		 470 0, /* bitpos */
471 complain_overflow_signed, /* complain_on_overflow */
472 mmix_elf_reloc, /* special_function */
473 "R_MMIX_CBRANCH_J", /* name */
b34976b6 474 FALSE, /* partial_inplace */
930b4cb2 475 ~0x0100ffff, /* src_mask */
3c3bdf30 476 0x0100ffff, /* dst_mask */
b34976b6 477 TRUE), /* pcrel_offset */
3c3bdf30
NC		 478
479 HOWTO (R_MMIX_CBRANCH_1, /* type */
480 2, /* rightshift */
481 2, /* size (0 = byte, 1 = short, 2 = long) */
482 19, /* bitsize */
b34976b6 483 TRUE, /* pc_relative */
3c3bdf30
NC		 484 0, /* bitpos */
485 complain_overflow_signed, /* complain_on_overflow */
486 mmix_elf_reloc, /* special_function */
487 "R_MMIX_CBRANCH_1", /* name */
b34976b6 488 FALSE, /* partial_inplace */
930b4cb2 489 ~0x0100ffff, /* src_mask */
3c3bdf30 490 0x0100ffff, /* dst_mask */
b34976b6 491 TRUE), /* pcrel_offset */
3c3bdf30
NC		 492
493 HOWTO (R_MMIX_CBRANCH_2, /* type */
494 2, /* rightshift */
495 2, /* size (0 = byte, 1 = short, 2 = long) */
496 19, /* bitsize */
b34976b6 497 TRUE, /* pc_relative */
3c3bdf30
NC		 498 0, /* bitpos */
499 complain_overflow_signed, /* complain_on_overflow */
500 mmix_elf_reloc, /* special_function */
501 "R_MMIX_CBRANCH_2", /* name */
b34976b6 502 FALSE, /* partial_inplace */
930b4cb2 503 ~0x0100ffff, /* src_mask */
3c3bdf30 504 0x0100ffff, /* dst_mask */
b34976b6 505 TRUE), /* pcrel_offset */
3c3bdf30
NC		 506
507 HOWTO (R_MMIX_CBRANCH_3, /* type */
508 2, /* rightshift */
509 2, /* size (0 = byte, 1 = short, 2 = long) */
510 19, /* bitsize */
b34976b6 511 TRUE, /* pc_relative */
3c3bdf30
NC		 512 0, /* bitpos */
513 complain_overflow_signed, /* complain_on_overflow */
514 mmix_elf_reloc, /* special_function */
515 "R_MMIX_CBRANCH_3", /* name */
b34976b6 516 FALSE, /* partial_inplace */
930b4cb2 517 ~0x0100ffff, /* src_mask */
3c3bdf30 518 0x0100ffff, /* dst_mask */
b34976b6 519 TRUE), /* pcrel_offset */
3c3bdf30
NC		 520
521 /* The PUSHJ instruction can reach any (code) address, as long as it's
522 the beginning of a function (no usable restriction). It can silently
523 expand to a 64-bit operand, but will emit an error if any of the two
f60ebe14
HPN		 524 least significant bits are set. It can also expand into a call to a
525 stub; see R_MMIX_PUSHJ_STUBBABLE. The howto members reflect a simple
3c3bdf30
NC		 526 PUSHJ. */
527 HOWTO (R_MMIX_PUSHJ, /* type */
528 2, /* rightshift */
529 2, /* size (0 = byte, 1 = short, 2 = long) */
530 19, /* bitsize */
b34976b6 531 TRUE, /* pc_relative */
3c3bdf30
NC		 532 0, /* bitpos */
533 complain_overflow_signed, /* complain_on_overflow */
534 mmix_elf_reloc, /* special_function */
535 "R_MMIX_PUSHJ", /* name */
b34976b6 536 FALSE, /* partial_inplace */
930b4cb2 537 ~0x0100ffff, /* src_mask */
3c3bdf30 538 0x0100ffff, /* dst_mask */
b34976b6 539 TRUE), /* pcrel_offset */
3c3bdf30
NC		 540
541 HOWTO (R_MMIX_PUSHJ_1, /* type */
542 2, /* rightshift */
543 2, /* size (0 = byte, 1 = short, 2 = long) */
544 19, /* bitsize */
b34976b6 545 TRUE, /* pc_relative */
3c3bdf30
NC		 546 0, /* bitpos */
547 complain_overflow_signed, /* complain_on_overflow */
548 mmix_elf_reloc, /* special_function */
549 "R_MMIX_PUSHJ_1", /* name */
b34976b6 550 FALSE, /* partial_inplace */
930b4cb2 551 ~0x0100ffff, /* src_mask */
3c3bdf30 552 0x0100ffff, /* dst_mask */
b34976b6 553 TRUE), /* pcrel_offset */
3c3bdf30
NC		 554
555 HOWTO (R_MMIX_PUSHJ_2, /* type */
556 2, /* rightshift */
557 2, /* size (0 = byte, 1 = short, 2 = long) */
558 19, /* bitsize */
b34976b6 559 TRUE, /* pc_relative */
3c3bdf30
NC		 560 0, /* bitpos */
561 complain_overflow_signed, /* complain_on_overflow */
562 mmix_elf_reloc, /* special_function */
563 "R_MMIX_PUSHJ_2", /* name */
b34976b6 564 FALSE, /* partial_inplace */
930b4cb2 565 ~0x0100ffff, /* src_mask */
3c3bdf30 566 0x0100ffff, /* dst_mask */
b34976b6 567 TRUE), /* pcrel_offset */
3c3bdf30
NC		 568
569 HOWTO (R_MMIX_PUSHJ_3, /* type */
570 2, /* rightshift */
571 2, /* size (0 = byte, 1 = short, 2 = long) */
572 19, /* bitsize */
b34976b6 573 TRUE, /* pc_relative */
3c3bdf30
NC		 574 0, /* bitpos */
575 complain_overflow_signed, /* complain_on_overflow */
576 mmix_elf_reloc, /* special_function */
577 "R_MMIX_PUSHJ_3", /* name */
b34976b6 578 FALSE, /* partial_inplace */
930b4cb2 579 ~0x0100ffff, /* src_mask */
3c3bdf30 580 0x0100ffff, /* dst_mask */
b34976b6 581 TRUE), /* pcrel_offset */
3c3bdf30
NC		 582
583 /* A JMP is supposed to reach any (code) address. By itself, it can
584 reach +-64M; the expansion can reach all 64 bits. Note that the 64M
585 limit is soon reached if you link the program in wildly different
586 memory segments. The howto members reflect a trivial JMP. */
587 HOWTO (R_MMIX_JMP, /* type */
588 2, /* rightshift */
589 2, /* size (0 = byte, 1 = short, 2 = long) */
590 27, /* bitsize */
b34976b6 591 TRUE, /* pc_relative */
3c3bdf30
NC		 592 0, /* bitpos */
593 complain_overflow_signed, /* complain_on_overflow */
594 mmix_elf_reloc, /* special_function */
595 "R_MMIX_JMP", /* name */
b34976b6 596 FALSE, /* partial_inplace */
930b4cb2 597 ~0x1ffffff, /* src_mask */
3c3bdf30 598 0x1ffffff, /* dst_mask */
b34976b6 599 TRUE), /* pcrel_offset */
3c3bdf30
NC		 600
601 HOWTO (R_MMIX_JMP_1, /* type */
602 2, /* rightshift */
603 2, /* size (0 = byte, 1 = short, 2 = long) */
604 27, /* bitsize */
b34976b6 605 TRUE, /* pc_relative */
3c3bdf30
NC		 606 0, /* bitpos */
607 complain_overflow_signed, /* complain_on_overflow */
608 mmix_elf_reloc, /* special_function */
609 "R_MMIX_JMP_1", /* name */
b34976b6 610 FALSE, /* partial_inplace */
930b4cb2 611 ~0x1ffffff, /* src_mask */
3c3bdf30 612 0x1ffffff, /* dst_mask */
b34976b6 613 TRUE), /* pcrel_offset */
3c3bdf30
NC		 614
615 HOWTO (R_MMIX_JMP_2, /* type */
616 2, /* rightshift */
617 2, /* size (0 = byte, 1 = short, 2 = long) */
618 27, /* bitsize */
b34976b6 619 TRUE, /* pc_relative */
3c3bdf30
NC		 620 0, /* bitpos */
621 complain_overflow_signed, /* complain_on_overflow */
622 mmix_elf_reloc, /* special_function */
623 "R_MMIX_JMP_2", /* name */
b34976b6 624 FALSE, /* partial_inplace */
930b4cb2 625 ~0x1ffffff, /* src_mask */
3c3bdf30 626 0x1ffffff, /* dst_mask */
b34976b6 627 TRUE), /* pcrel_offset */
3c3bdf30
NC		 628
629 HOWTO (R_MMIX_JMP_3, /* type */
630 2, /* rightshift */
631 2, /* size (0 = byte, 1 = short, 2 = long) */
632 27, /* bitsize */
b34976b6 633 TRUE, /* pc_relative */
3c3bdf30
NC		 634 0, /* bitpos */
635 complain_overflow_signed, /* complain_on_overflow */
636 mmix_elf_reloc, /* special_function */
637 "R_MMIX_JMP_3", /* name */
b34976b6 638 FALSE, /* partial_inplace */
930b4cb2 639 ~0x1ffffff, /* src_mask */
3c3bdf30 640 0x1ffffff, /* dst_mask */
b34976b6 641 TRUE), /* pcrel_offset */
3c3bdf30
NC		 642
643 /* When we don't emit link-time-relaxable code from the assembler, or
644 when relaxation has done all it can do, these relocs are used. For
645 GETA/PUSHJ/branches. */
646 HOWTO (R_MMIX_ADDR19, /* type */
647 2, /* rightshift */
648 2, /* size (0 = byte, 1 = short, 2 = long) */
649 19, /* bitsize */
b34976b6 650 TRUE, /* pc_relative */
3c3bdf30
NC		 651 0, /* bitpos */
652 complain_overflow_signed, /* complain_on_overflow */
653 mmix_elf_reloc, /* special_function */
654 "R_MMIX_ADDR19", /* name */
b34976b6 655 FALSE, /* partial_inplace */
930b4cb2 656 ~0x0100ffff, /* src_mask */
3c3bdf30 657 0x0100ffff, /* dst_mask */
b34976b6 658 TRUE), /* pcrel_offset */
3c3bdf30
NC		 659
660 /* For JMP. */
661 HOWTO (R_MMIX_ADDR27, /* type */
662 2, /* rightshift */
663 2, /* size (0 = byte, 1 = short, 2 = long) */
664 27, /* bitsize */
b34976b6 665 TRUE, /* pc_relative */
3c3bdf30
NC		 666 0, /* bitpos */
667 complain_overflow_signed, /* complain_on_overflow */
668 mmix_elf_reloc, /* special_function */
669 "R_MMIX_ADDR27", /* name */
b34976b6 670 FALSE, /* partial_inplace */
930b4cb2 671 ~0x1ffffff, /* src_mask */
3c3bdf30 672 0x1ffffff, /* dst_mask */
b34976b6 673 TRUE), /* pcrel_offset */
3c3bdf30
NC		 674
675 /* A general register or the value 0..255. If a value, then the
676 instruction (offset -3) needs adjusting. */
677 HOWTO (R_MMIX_REG_OR_BYTE, /* type */
678 0, /* rightshift */
679 1, /* size (0 = byte, 1 = short, 2 = long) */
680 8, /* bitsize */
b34976b6 681 FALSE, /* pc_relative */
3c3bdf30
NC		 682 0, /* bitpos */
683 complain_overflow_bitfield, /* complain_on_overflow */
684 mmix_elf_reloc, /* special_function */
685 "R_MMIX_REG_OR_BYTE", /* name */
b34976b6 686 FALSE, /* partial_inplace */
930b4cb2 687 0, /* src_mask */
3c3bdf30 688 0xff, /* dst_mask */
b34976b6 689 FALSE), /* pcrel_offset */
3c3bdf30
NC		 690
691 /* A general register. */
692 HOWTO (R_MMIX_REG, /* type */
693 0, /* rightshift */
694 1, /* size (0 = byte, 1 = short, 2 = long) */
695 8, /* bitsize */
b34976b6 696 FALSE, /* pc_relative */
3c3bdf30
NC		 697 0, /* bitpos */
698 complain_overflow_bitfield, /* complain_on_overflow */
699 mmix_elf_reloc, /* special_function */
700 "R_MMIX_REG", /* name */
b34976b6 701 FALSE, /* partial_inplace */
930b4cb2 702 0, /* src_mask */
3c3bdf30 703 0xff, /* dst_mask */
b34976b6 704 FALSE), /* pcrel_offset */
3c3bdf30
NC		 705
706 /* A register plus an index, corresponding to the relocation expression.
707 The sizes must correspond to the valid range of the expression, while
708 the bitmasks correspond to what we store in the image. */
709 HOWTO (R_MMIX_BASE_PLUS_OFFSET, /* type */
710 0, /* rightshift */
711 4, /* size (0 = byte, 1 = short, 2 = long) */
712 64, /* bitsize */
b34976b6 713 FALSE, /* pc_relative */
3c3bdf30
NC		 714 0, /* bitpos */
715 complain_overflow_bitfield, /* complain_on_overflow */
716 mmix_elf_reloc, /* special_function */
717 "R_MMIX_BASE_PLUS_OFFSET", /* name */
b34976b6 718 FALSE, /* partial_inplace */
930b4cb2 719 0, /* src_mask */
3c3bdf30 720 0xffff, /* dst_mask */
b34976b6 721 FALSE), /* pcrel_offset */
3c3bdf30
NC		 722
723 /* A "magic" relocation for a LOCAL expression, asserting that the
724 expression is less than the number of global registers. No actual
725 modification of the contents is done. Implementing this as a
726 relocation was less intrusive than e.g. putting such expressions in a
727 section to discard *after* relocation. */
728 HOWTO (R_MMIX_LOCAL, /* type */
729 0, /* rightshift */
730 0, /* size (0 = byte, 1 = short, 2 = long) */
731 0, /* bitsize */
b34976b6 732 FALSE, /* pc_relative */
3c3bdf30
NC		 733 0, /* bitpos */
734 complain_overflow_dont, /* complain_on_overflow */
735 mmix_elf_reloc, /* special_function */
736 "R_MMIX_LOCAL", /* name */
b34976b6 737 FALSE, /* partial_inplace */
3c3bdf30
NC		 738 0, /* src_mask */
739 0, /* dst_mask */
b34976b6 740 FALSE), /* pcrel_offset */
f60ebe14
HPN		 741
742 HOWTO (R_MMIX_PUSHJ_STUBBABLE, /* type */
743 2, /* rightshift */
744 2, /* size (0 = byte, 1 = short, 2 = long) */
745 19, /* bitsize */
746 TRUE, /* pc_relative */
747 0, /* bitpos */
748 complain_overflow_signed, /* complain_on_overflow */
749 mmix_elf_reloc, /* special_function */
750 "R_MMIX_PUSHJ_STUBBABLE", /* name */
751 FALSE, /* partial_inplace */
752 ~0x0100ffff, /* src_mask */
753 0x0100ffff, /* dst_mask */
754 TRUE) /* pcrel_offset */
3c3bdf30
NC		 755 };
756
757
758/* Map BFD reloc types to MMIX ELF reloc types. */
759
760struct mmix_reloc_map
761 {
762 bfd_reloc_code_real_type bfd_reloc_val;
763 enum elf_mmix_reloc_type elf_reloc_val;
764 };
765
766
767static const struct mmix_reloc_map mmix_reloc_map[] =
768 {
769 {BFD_RELOC_NONE, R_MMIX_NONE},
770 {BFD_RELOC_8, R_MMIX_8},
771 {BFD_RELOC_16, R_MMIX_16},
772 {BFD_RELOC_24, R_MMIX_24},
773 {BFD_RELOC_32, R_MMIX_32},
774 {BFD_RELOC_64, R_MMIX_64},
775 {BFD_RELOC_8_PCREL, R_MMIX_PC_8},
776 {BFD_RELOC_16_PCREL, R_MMIX_PC_16},
777 {BFD_RELOC_24_PCREL, R_MMIX_PC_24},
778 {BFD_RELOC_32_PCREL, R_MMIX_PC_32},
779 {BFD_RELOC_64_PCREL, R_MMIX_PC_64},
780 {BFD_RELOC_VTABLE_INHERIT, R_MMIX_GNU_VTINHERIT},
781 {BFD_RELOC_VTABLE_ENTRY, R_MMIX_GNU_VTENTRY},
782 {BFD_RELOC_MMIX_GETA, R_MMIX_GETA},
783 {BFD_RELOC_MMIX_CBRANCH, R_MMIX_CBRANCH},
784 {BFD_RELOC_MMIX_PUSHJ, R_MMIX_PUSHJ},
785 {BFD_RELOC_MMIX_JMP, R_MMIX_JMP},
786 {BFD_RELOC_MMIX_ADDR19, R_MMIX_ADDR19},
787 {BFD_RELOC_MMIX_ADDR27, R_MMIX_ADDR27},
788 {BFD_RELOC_MMIX_REG_OR_BYTE, R_MMIX_REG_OR_BYTE},
789 {BFD_RELOC_MMIX_REG, R_MMIX_REG},
790 {BFD_RELOC_MMIX_BASE_PLUS_OFFSET, R_MMIX_BASE_PLUS_OFFSET},
f60ebe14
HPN		 791 {BFD_RELOC_MMIX_LOCAL, R_MMIX_LOCAL},
792 {BFD_RELOC_MMIX_PUSHJ_STUBBABLE, R_MMIX_PUSHJ_STUBBABLE}
3c3bdf30
NC		 793 };
794
795static reloc_howto_type *
2c3fc389
NC		 796bfd_elf64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
797 bfd_reloc_code_real_type code)
3c3bdf30
NC		 798{
799 unsigned int i;
800
801 for (i = 0;
802 i < sizeof (mmix_reloc_map) / sizeof (mmix_reloc_map[0]);
803 i++)
804 {
805 if (mmix_reloc_map[i].bfd_reloc_val == code)
806 return &elf_mmix_howto_table[mmix_reloc_map[i].elf_reloc_val];
807 }
808
809 return NULL;
157090f7
AM		 810}
811
812static reloc_howto_type *
813bfd_elf64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
814 const char *r_name)
815{
816 unsigned int i;
817
818 for (i = 0;
819 i < sizeof (elf_mmix_howto_table) / sizeof (elf_mmix_howto_table[0]);
820 i++)
821 if (elf_mmix_howto_table[i].name != NULL
822 && strcasecmp (elf_mmix_howto_table[i].name, r_name) == 0)
823 return &elf_mmix_howto_table[i];
824
825 return NULL;
3c3bdf30
NC		 826}
827
f0abc2a1 828static bfd_boolean
2c3fc389 829mmix_elf_new_section_hook (bfd *abfd, asection *sec)
f0abc2a1 830{
f592407e
AM		 831 if (!sec->used_by_bfd)
832 {
833 struct _mmix_elf_section_data *sdata;
834 bfd_size_type amt = sizeof (*sdata);
f0abc2a1 835
f592407e
AM		 836 sdata = bfd_zalloc (abfd, amt);
837 if (sdata == NULL)
838 return FALSE;
839 sec->used_by_bfd = sdata;
840 }
f0abc2a1
AM		 841
842 return _bfd_elf_new_section_hook (abfd, sec);
843}
844
3c3bdf30
NC		 845
846/* This function performs the actual bitfiddling and sanity check for a
847 final relocation. Each relocation gets its *worst*-case expansion
848 in size when it arrives here; any reduction in size should have been
849 caught in linker relaxation earlier. When we get here, the relocation
850 looks like the smallest instruction with SWYM:s (nop:s) appended to the
851 max size. We fill in those nop:s.
852
853 R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra)
854 GETA $N,foo
855 ->
856 SETL $N,foo & 0xffff
857 INCML $N,(foo >> 16) & 0xffff
858 INCMH $N,(foo >> 32) & 0xffff
859 INCH $N,(foo >> 48) & 0xffff
860
861 R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but
862 condbranches needing relaxation might be rare enough to not be
863 worthwhile.)
864 [P]Bcc $N,foo
865 ->
866 [~P]B~cc $N,.+20
867 SETL $255,foo & ...
868 INCML ...
869 INCMH ...
870 INCH ...
871 GO $255,$255,0
872
873 R_MMIX_PUSHJ: (FIXME: Relaxation...)
874 PUSHJ $N,foo
875 ->
876 SETL $255,foo & ...
877 INCML ...
878 INCMH ...
879 INCH ...
880 PUSHGO $N,$255,0
881
882 R_MMIX_JMP: (FIXME: Relaxation...)
883 JMP foo
884 ->
885 SETL $255,foo & ...
886 INCML ...
887 INCMH ...
888 INCH ...
889 GO $255,$255,0
890
891 R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */
892
893static bfd_reloc_status_type
18978b27
HPN		 894mmix_elf_perform_relocation (asection *isec, reloc_howto_type *howto,
895 void *datap, bfd_vma addr, bfd_vma value,
896 char **error_message)
3c3bdf30
NC		 897{
898 bfd *abfd = isec->owner;
899 bfd_reloc_status_type flag = bfd_reloc_ok;
900 bfd_reloc_status_type r;
901 int offs = 0;
902 int reg = 255;
903
904 /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences.
905 We handle the differences here and the common sequence later. */
906 switch (howto->type)
907 {
908 case R_MMIX_GETA:
909 offs = 0;
910 reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1);
911
912 /* We change to an absolute value. */
913 value += addr;
914 break;
915
916 case R_MMIX_CBRANCH:
917 {
918 int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16;
919
920 /* Invert the condition and prediction bit, and set the offset
921 to five instructions ahead.
922
923 We *can* do better if we want to. If the branch is found to be
924 within limits, we could leave the branch as is; there'll just
925 be a bunch of NOP:s after it. But we shouldn't see this
926 sequence often enough that it's worth doing it. */
927
928 bfd_put_32 (abfd,
929 (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff)
930 | (24/4)),
931 (bfd_byte *) datap);
932
933 /* Put a "GO $255,$255,0" after the common sequence. */
934 bfd_put_32 (abfd,
935 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00,
936 (bfd_byte *) datap + 20);
937
938 /* Common sequence starts at offset 4. */
939 offs = 4;
940
941 /* We change to an absolute value. */
942 value += addr;
943 }
944 break;
945
f60ebe14
HPN		 946 case R_MMIX_PUSHJ_STUBBABLE:
947 /* If the address fits, we're fine. */
948 if ((value & 3) == 0
949 /* Note rightshift 0; see R_MMIX_JMP case below. */
950 && (r = bfd_check_overflow (complain_overflow_signed,
951 howto->bitsize,
952 0,
953 bfd_arch_bits_per_address (abfd),
954 value)) == bfd_reloc_ok)
955 goto pcrel_mmix_reloc_fits;
956 else
957 {
1a23a9e6 958 bfd_size_type size = isec->rawsize ? isec->rawsize : isec->size;
f60ebe14
HPN		 959
960 /* We have the bytes at the PUSHJ insn and need to get the
961 position for the stub. There's supposed to be room allocated
962 for the stub. */
963 bfd_byte *stubcontents
f075ee0c 964 = ((bfd_byte *) datap
f60ebe14 965 - (addr - (isec->output_section->vma + isec->output_offset))
eea6121a 966 + size
f60ebe14
HPN		 967 + mmix_elf_section_data (isec)->pjs.stub_offset);
968 bfd_vma stubaddr;
969
18978b27
HPN		 970 if (mmix_elf_section_data (isec)->pjs.n_pushj_relocs == 0)
971 {
972 /* This shouldn't happen when linking to ELF or mmo, so
973 this is an attempt to link to "binary", right? We
974 can't access the output bfd, so we can't verify that
975 assumption. We only know that the critical
976 mmix_elf_check_common_relocs has not been called,
977 which happens when the output format is different
978 from the input format (and is not mmo). */
979 if (! mmix_elf_section_data (isec)->has_warned_pushj)
980 {
981 /* For the first such error per input section, produce
982 a verbose message. */
983 *error_message
984 = _("invalid input relocation when producing"
985 " non-ELF, non-mmo format output."
986 "\n Please use the objcopy program to convert from"
987 " ELF or mmo,"
988 "\n or assemble using"
989 " \"-no-expand\" (for gcc, \"-Wa,-no-expand\"");
990 mmix_elf_section_data (isec)->has_warned_pushj = TRUE;
991 return bfd_reloc_dangerous;
992 }
993
994 /* For subsequent errors, return this one, which is
995 rate-limited but looks a little bit different,
996 hopefully without affecting user-friendliness. */
997 return bfd_reloc_overflow;
998 }
999
f60ebe14
HPN		 1000 /* The address doesn't fit, so redirect the PUSHJ to the
1001 location of the stub. */
1002 r = mmix_elf_perform_relocation (isec,
1003 &elf_mmix_howto_table
1004 [R_MMIX_ADDR19],
1005 datap,
1006 addr,
1007 isec->output_section->vma
1008 + isec->output_offset
eea6121a 1009 + size
f60ebe14
HPN		 1010 + (mmix_elf_section_data (isec)
1011 ->pjs.stub_offset)
18978b27
HPN		 1012 - addr,
1013 error_message);
f60ebe14
HPN		 1014 if (r != bfd_reloc_ok)
1015 return r;
1016
1017 stubaddr
1018 = (isec->output_section->vma
1019 + isec->output_offset
eea6121a 1020 + size
f60ebe14
HPN		 1021 + mmix_elf_section_data (isec)->pjs.stub_offset);
1022
1023 /* We generate a simple JMP if that suffices, else the whole 5
1024 insn stub. */
1025 if (bfd_check_overflow (complain_overflow_signed,
1026 elf_mmix_howto_table[R_MMIX_ADDR27].bitsize,
1027 0,
1028 bfd_arch_bits_per_address (abfd),
1029 addr + value - stubaddr) == bfd_reloc_ok)
1030 {
1031 bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents);
1032 r = mmix_elf_perform_relocation (isec,
1033 &elf_mmix_howto_table
1034 [R_MMIX_ADDR27],
1035 stubcontents,
1036 stubaddr,
18978b27
HPN		 1037 value + addr - stubaddr,
1038 error_message);
f60ebe14
HPN		 1039 mmix_elf_section_data (isec)->pjs.stub_offset += 4;
1040
eea6121a
AM		 1041 if (size + mmix_elf_section_data (isec)->pjs.stub_offset
1042 > isec->size)
f60ebe14
HPN		 1043 abort ();
1044
1045 return r;
1046 }
1047 else
1048 {
1049 /* Put a "GO $255,0" after the common sequence. */
1050 bfd_put_32 (abfd,
1051 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
1052 | 0xff00, (bfd_byte *) stubcontents + 16);
1053
1054 /* Prepare for the general code to set the first part of the
1055 linker stub, and */
1056 value += addr;
1057 datap = stubcontents;
1058 mmix_elf_section_data (isec)->pjs.stub_offset
1059 += MAX_PUSHJ_STUB_SIZE;
1060 }
1061 }
1062 break;
1063
3c3bdf30
NC		 1064 case R_MMIX_PUSHJ:
1065 {
1066 int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1);
1067
1068 /* Put a "PUSHGO $N,$255,0" after the common sequence. */
1069 bfd_put_32 (abfd,
1070 ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
1071 | (inreg << 16)
1072 | 0xff00,
1073 (bfd_byte *) datap + 16);
1074
1075 /* We change to an absolute value. */
1076 value += addr;
1077 }
1078 break;
1079
1080 case R_MMIX_JMP:
1081 /* This one is a little special. If we get here on a non-relaxing
1082 link, and the destination is actually in range, we don't need to
1083 execute the nops.
1084 If so, we fall through to the bit-fiddling relocs.
1085
1086 FIXME: bfd_check_overflow seems broken; the relocation is
1087 rightshifted before testing, so supply a zero rightshift. */
1088
1089 if (! ((value & 3) == 0
1090 && (r = bfd_check_overflow (complain_overflow_signed,
1091 howto->bitsize,
1092 0,
1093 bfd_arch_bits_per_address (abfd),
1094 value)) == bfd_reloc_ok))
1095 {
1096 /* If the relocation doesn't fit in a JMP, we let the NOP:s be
1097 modified below, and put a "GO $255,$255,0" after the
1098 address-loading sequence. */
1099 bfd_put_32 (abfd,
1100 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
1101 | 0xffff00,
1102 (bfd_byte *) datap + 16);
1103
1104 /* We change to an absolute value. */
1105 value += addr;
1106 break;
1107 }
cedb70c5 1108 /* FALLTHROUGH. */
3c3bdf30
NC		 1109 case R_MMIX_ADDR19:
1110 case R_MMIX_ADDR27:
f60ebe14 1111 pcrel_mmix_reloc_fits:
3c3bdf30
NC		 1112 /* These must be in range, or else we emit an error. */
1113 if ((value & 3) == 0
1114 /* Note rightshift 0; see above. */
1115 && (r = bfd_check_overflow (complain_overflow_signed,
1116 howto->bitsize,
1117 0,
1118 bfd_arch_bits_per_address (abfd),
1119 value)) == bfd_reloc_ok)
1120 {
1121 bfd_vma in1
1122 = bfd_get_32 (abfd, (bfd_byte *) datap);
1123 bfd_vma highbit;
1124
1125 if ((bfd_signed_vma) value < 0)
1126 {
f60ebe14 1127 highbit = 1 << 24;
3c3bdf30
NC		 1128 value += (1 << (howto->bitsize - 1));
1129 }
1130 else
1131 highbit = 0;
1132
1133 value >>= 2;
1134
1135 bfd_put_32 (abfd,
930b4cb2 1136 (in1 & howto->src_mask)
3c3bdf30
NC		 1137 | highbit
1138 | (value & howto->dst_mask),
1139 (bfd_byte *) datap);
1140
1141 return bfd_reloc_ok;
1142 }
1143 else
1144 return bfd_reloc_overflow;
1145
930b4cb2
HPN		 1146 case R_MMIX_BASE_PLUS_OFFSET:
1147 {
1148 struct bpo_reloc_section_info *bpodata
f0abc2a1 1149 = mmix_elf_section_data (isec)->bpo.reloc;
18978b27
HPN		 1150 asection *bpo_greg_section;
1151 struct bpo_greg_section_info *gregdata;
1152 size_t bpo_index;
1153
1154 if (bpodata == NULL)
1155 {
1156 /* This shouldn't happen when linking to ELF or mmo, so
1157 this is an attempt to link to "binary", right? We
1158 can't access the output bfd, so we can't verify that
1159 assumption. We only know that the critical
1160 mmix_elf_check_common_relocs has not been called, which
1161 happens when the output format is different from the
1162 input format (and is not mmo). */
1163 if (! mmix_elf_section_data (isec)->has_warned_bpo)
1164 {
1165 /* For the first such error per input section, produce
1166 a verbose message. */
1167 *error_message
1168 = _("invalid input relocation when producing"
1169 " non-ELF, non-mmo format output."
1170 "\n Please use the objcopy program to convert from"
1171 " ELF or mmo,"
1172 "\n or compile using the gcc-option"
1173 " \"-mno-base-addresses\".");
1174 mmix_elf_section_data (isec)->has_warned_bpo = TRUE;
1175 return bfd_reloc_dangerous;
1176 }
1177
1178 /* For subsequent errors, return this one, which is
1179 rate-limited but looks a little bit different,
1180 hopefully without affecting user-friendliness. */
1181 return bfd_reloc_overflow;
1182 }
1183
1184 bpo_greg_section = bpodata->bpo_greg_section;
1185 gregdata = mmix_elf_section_data (bpo_greg_section)->bpo.greg;
1186 bpo_index = gregdata->bpo_reloc_indexes[bpodata->bpo_index++];
930b4cb2
HPN		 1187
1188 /* A consistency check: The value we now have in "relocation" must
1189 be the same as the value we stored for that relocation. It
1190 doesn't cost much, so can be left in at all times. */
1191 if (value != gregdata->reloc_request[bpo_index].value)
1192 {
1193 (*_bfd_error_handler)
1194 (_("%s: Internal inconsistency error for value for\n\
1195 linker-allocated global register: linked: 0x%lx%08lx != relaxed: 0x%lx%08lx\n"),
1196 bfd_get_filename (isec->owner),
1197 (unsigned long) (value >> 32), (unsigned long) value,
1198 (unsigned long) (gregdata->reloc_request[bpo_index].value
1199 >> 32),
1200 (unsigned long) gregdata->reloc_request[bpo_index].value);
1201 bfd_set_error (bfd_error_bad_value);
1202 return bfd_reloc_overflow;
1203 }
1204
1205 /* Then store the register number and offset for that register
1206 into datap and datap + 1 respectively. */
1207 bfd_put_8 (abfd,
1208 gregdata->reloc_request[bpo_index].regindex
1209 + bpo_greg_section->output_section->vma / 8,
1210 datap);
1211 bfd_put_8 (abfd,
1212 gregdata->reloc_request[bpo_index].offset,
1213 ((unsigned char *) datap) + 1);
1214 return bfd_reloc_ok;
1215 }
1216
3c3bdf30
NC		 1217 case R_MMIX_REG_OR_BYTE:
1218 case R_MMIX_REG:
1219 if (value > 255)
1220 return bfd_reloc_overflow;
1221 bfd_put_8 (abfd, value, datap);
1222 return bfd_reloc_ok;
1223
1224 default:
1225 BAD_CASE (howto->type);
1226 }
1227
1228 /* This code adds the common SETL/INCML/INCMH/INCH worst-case
1229 sequence. */
1230
1231 /* Lowest two bits must be 0. We return bfd_reloc_overflow for
1232 everything that looks strange. */
1233 if (value & 3)
1234 flag = bfd_reloc_overflow;
1235
1236 bfd_put_32 (abfd,
1237 (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16),
1238 (bfd_byte *) datap + offs);
1239 bfd_put_32 (abfd,
1240 (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16),
1241 (bfd_byte *) datap + offs + 4);
1242 bfd_put_32 (abfd,
1243 (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16),
1244 (bfd_byte *) datap + offs + 8);
1245 bfd_put_32 (abfd,
1246 (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16),
1247 (bfd_byte *) datap + offs + 12);
1248
1249 return flag;
1250}
1251
1252/* Set the howto pointer for an MMIX ELF reloc (type RELA). */
1253
1254static void
2c3fc389
NC		 1255mmix_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
1256 arelent *cache_ptr,
1257 Elf_Internal_Rela *dst)
3c3bdf30
NC		 1258{
1259 unsigned int r_type;
1260
1261 r_type = ELF64_R_TYPE (dst->r_info);
1262 BFD_ASSERT (r_type < (unsigned int) R_MMIX_max);
1263 cache_ptr->howto = &elf_mmix_howto_table[r_type];
1264}
1265
1266/* Any MMIX-specific relocation gets here at assembly time or when linking
1267 to other formats (such as mmo); this is the relocation function from
1268 the reloc_table. We don't get here for final pure ELF linking. */
1269
1270static bfd_reloc_status_type
2c3fc389
NC		 1271mmix_elf_reloc (bfd *abfd,
1272 arelent *reloc_entry,
1273 asymbol *symbol,
1274 void * data,
1275 asection *input_section,
1276 bfd *output_bfd,
1277 char **error_message)
3c3bdf30
NC		 1278{
1279 bfd_vma relocation;
1280 bfd_reloc_status_type r;
1281 asection *reloc_target_output_section;
1282 bfd_reloc_status_type flag = bfd_reloc_ok;
1283 bfd_vma output_base = 0;
3c3bdf30
NC		 1284
1285 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1286 input_section, output_bfd, error_message);
1287
1288 /* If that was all that was needed (i.e. this isn't a final link, only
1289 some segment adjustments), we're done. */
1290 if (r != bfd_reloc_continue)
1291 return r;
1292
1293 if (bfd_is_und_section (symbol->section)
1294 && (symbol->flags & BSF_WEAK) == 0
1295 && output_bfd == (bfd *) NULL)
1296 return bfd_reloc_undefined;
1297
1298 /* Is the address of the relocation really within the section? */
07515404 1299 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
3c3bdf30
NC		 1300 return bfd_reloc_outofrange;
1301
4cc11e76 1302 /* Work out which section the relocation is targeted at and the
3c3bdf30
NC		 1303 initial relocation command value. */
1304
1305 /* Get symbol value. (Common symbols are special.) */
1306 if (bfd_is_com_section (symbol->section))
1307 relocation = 0;
1308 else
1309 relocation = symbol->value;
1310
1311 reloc_target_output_section = bfd_get_output_section (symbol);
1312
1313 /* Here the variable relocation holds the final address of the symbol we
1314 are relocating against, plus any addend. */
1315 if (output_bfd)
1316 output_base = 0;
1317 else
1318 output_base = reloc_target_output_section->vma;
1319
1320 relocation += output_base + symbol->section->output_offset;
1321
3c3bdf30
NC		 1322 if (output_bfd != (bfd *) NULL)
1323 {
1324 /* Add in supplied addend. */
1325 relocation += reloc_entry->addend;
1326
1327 /* This is a partial relocation, and we want to apply the
1328 relocation to the reloc entry rather than the raw data.
1329 Modify the reloc inplace to reflect what we now know. */
1330 reloc_entry->addend = relocation;
1331 reloc_entry->address += input_section->output_offset;
1332 return flag;
1333 }
1334
1335 return mmix_final_link_relocate (reloc_entry->howto, input_section,
1336 data, reloc_entry->address,
1337 reloc_entry->addend, relocation,
1338 bfd_asymbol_name (symbol),
18978b27
HPN		 1339 reloc_target_output_section,
1340 error_message);
3c3bdf30 1341}
e06fcc86 1342\f
3c3bdf30
NC		 1343/* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it
1344 for guidance if you're thinking of copying this. */
1345
b34976b6 1346static bfd_boolean
2c3fc389
NC		 1347mmix_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
1348 struct bfd_link_info *info,
1349 bfd *input_bfd,
1350 asection *input_section,
1351 bfd_byte *contents,
1352 Elf_Internal_Rela *relocs,
1353 Elf_Internal_Sym *local_syms,
1354 asection **local_sections)
3c3bdf30
NC		 1355{
1356 Elf_Internal_Shdr *symtab_hdr;
1357 struct elf_link_hash_entry **sym_hashes;
1358 Elf_Internal_Rela *rel;
1359 Elf_Internal_Rela *relend;
1a23a9e6 1360 bfd_size_type size;
f60ebe14 1361 size_t pjsno = 0;
3c3bdf30 1362
1a23a9e6 1363 size = input_section->rawsize ? input_section->rawsize : input_section->size;
3c3bdf30
NC		 1364 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1365 sym_hashes = elf_sym_hashes (input_bfd);
1366 relend = relocs + input_section->reloc_count;
1367
1a23a9e6
AM		 1368 /* Zero the stub area before we start. */
1369 if (input_section->rawsize != 0
1370 && input_section->size > input_section->rawsize)
1371 memset (contents + input_section->rawsize, 0,
1372 input_section->size - input_section->rawsize);
1373
3c3bdf30
NC		 1374 for (rel = relocs; rel < relend; rel ++)
1375 {
1376 reloc_howto_type *howto;
1377 unsigned long r_symndx;
1378 Elf_Internal_Sym *sym;
1379 asection *sec;
1380 struct elf_link_hash_entry *h;
1381 bfd_vma relocation;
1382 bfd_reloc_status_type r;
1383 const char *name = NULL;
1384 int r_type;
b34976b6 1385 bfd_boolean undefined_signalled = FALSE;
3c3bdf30
NC		 1386
1387 r_type = ELF64_R_TYPE (rel->r_info);
1388
1389 if (r_type == R_MMIX_GNU_VTINHERIT
1390 || r_type == R_MMIX_GNU_VTENTRY)
1391 continue;
1392
1393 r_symndx = ELF64_R_SYM (rel->r_info);
1394
ab96bf03
AM		 1395 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info);
1396 h = NULL;
1397 sym = NULL;
1398 sec = NULL;
1399
1400 if (r_symndx < symtab_hdr->sh_info)
1401 {
1402 sym = local_syms + r_symndx;
1403 sec = local_sections [r_symndx];
1404 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1405
1406 name = bfd_elf_string_from_elf_section (input_bfd,
1407 symtab_hdr->sh_link,
1408 sym->st_name);
1409 if (name == NULL)
1410 name = bfd_section_name (input_bfd, sec);
1411 }
1412 else
1413 {
62d887d4 1414 bfd_boolean unresolved_reloc, ignored;
ab96bf03
AM		 1415
1416 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1417 r_symndx, symtab_hdr, sym_hashes,
1418 h, sec, relocation,
62d887d4
L		 1419 unresolved_reloc, undefined_signalled,
1420 ignored);
ab96bf03
AM		 1421 name = h->root.root.string;
1422 }
1423
dbaa2011 1424 if (sec != NULL && discarded_section (sec))
e4067dbb 1425 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
545fd46b 1426 rel, 1, relend, howto, 0, contents);
ab96bf03 1427
1049f94e 1428 if (info->relocatable)
3c3bdf30 1429 {
f60ebe14
HPN		 1430 /* This is a relocatable link. For most relocs we don't have to
1431 change anything, unless the reloc is against a section
1432 symbol, in which case we have to adjust according to where
1433 the section symbol winds up in the output section. */
ab96bf03
AM		 1434 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1435 rel->r_addend += sec->output_offset;
3c3bdf30 1436
f60ebe14
HPN		 1437 /* For PUSHJ stub relocs however, we may need to change the
1438 reloc and the section contents, if the reloc doesn't reach
1439 beyond the end of the output section and previous stubs.
1440 Then we change the section contents to be a PUSHJ to the end
1441 of the input section plus stubs (we can do that without using
1442 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ
1443 at the stub location. */
1444 if (r_type == R_MMIX_PUSHJ_STUBBABLE)
1445 {
1446 /* We've already checked whether we need a stub; use that
1447 knowledge. */
1448 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno]
1449 != 0)
1450 {
1451 Elf_Internal_Rela relcpy;
1452
1453 if (mmix_elf_section_data (input_section)
1454 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE)
1455 abort ();
1456
1457 /* There's already a PUSHJ insn there, so just fill in
1458 the offset bits to the stub. */
1459 if (mmix_final_link_relocate (elf_mmix_howto_table
1460 + R_MMIX_ADDR19,
1461 input_section,
1462 contents,
1463 rel->r_offset,
1464 0,
1465 input_section
1466 ->output_section->vma
1467 + input_section->output_offset
eea6121a 1468 + size
f60ebe14
HPN		 1469 + mmix_elf_section_data (input_section)
1470 ->pjs.stub_offset,
18978b27 1471 NULL, NULL, NULL) != bfd_reloc_ok)
f60ebe14
HPN		 1472 return FALSE;
1473
1474 /* Put a JMP insn at the stub; it goes with the
1475 R_MMIX_JMP reloc. */
1476 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24,
1477 contents
eea6121a 1478 + size
f60ebe14
HPN		 1479 + mmix_elf_section_data (input_section)
1480 ->pjs.stub_offset);
1481
1482 /* Change the reloc to be at the stub, and to a full
1483 R_MMIX_JMP reloc. */
1484 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP);
1485 rel->r_offset
eea6121a 1486 = (size
f60ebe14
HPN		 1487 + mmix_elf_section_data (input_section)
1488 ->pjs.stub_offset);
1489
1490 mmix_elf_section_data (input_section)->pjs.stub_offset
1491 += MAX_PUSHJ_STUB_SIZE;
1492
1493 /* Shift this reloc to the end of the relocs to maintain
1494 the r_offset sorted reloc order. */
1495 relcpy = *rel;
1496 memmove (rel, rel + 1, (char *) relend - (char *) rel);
1497 relend[-1] = relcpy;
1498
1499 /* Back up one reloc, or else we'd skip the next reloc
1500 in turn. */
1501 rel--;
1502 }
1503
1504 pjsno++;
1505 }
3c3bdf30
NC		 1506 continue;
1507 }
1508
3c3bdf30
NC		 1509 r = mmix_final_link_relocate (howto, input_section,
1510 contents, rel->r_offset,
18978b27 1511 rel->r_addend, relocation, name, sec, NULL);
3c3bdf30
NC		 1512
1513 if (r != bfd_reloc_ok)
1514 {
b34976b6 1515 bfd_boolean check_ok = TRUE;
3c3bdf30
NC		 1516 const char * msg = (const char *) NULL;
1517
1518 switch (r)
1519 {
1520 case bfd_reloc_overflow:
1521 check_ok = info->callbacks->reloc_overflow
dfeffb9f
L		 1522 (info, (h ? &h->root : NULL), name, howto->name,
1523 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3c3bdf30
NC		 1524 break;
1525
1526 case bfd_reloc_undefined:
1527 /* We may have sent this message above. */
1528 if (! undefined_signalled)
1529 check_ok = info->callbacks->undefined_symbol
1530 (info, name, input_bfd, input_section, rel->r_offset,
b34976b6
AM		 1531 TRUE);
1532 undefined_signalled = TRUE;
3c3bdf30
NC		 1533 break;
1534
1535 case bfd_reloc_outofrange:
1536 msg = _("internal error: out of range error");
1537 break;
1538
1539 case bfd_reloc_notsupported:
1540 msg = _("internal error: unsupported relocation error");
1541 break;
1542
1543 case bfd_reloc_dangerous:
1544 msg = _("internal error: dangerous relocation");
1545 break;
1546
1547 default:
1548 msg = _("internal error: unknown error");
1549 break;
1550 }
1551
1552 if (msg)
1553 check_ok = info->callbacks->warning
1554 (info, msg, name, input_bfd, input_section, rel->r_offset);
1555
1556 if (! check_ok)
b34976b6 1557 return FALSE;
3c3bdf30
NC		 1558 }
1559 }
1560
b34976b6 1561 return TRUE;
3c3bdf30 1562}
e06fcc86 1563\f
3c3bdf30
NC		 1564/* Perform a single relocation. By default we use the standard BFD
1565 routines. A few relocs we have to do ourselves. */
1566
1567static bfd_reloc_status_type
18978b27
HPN		 1568mmix_final_link_relocate (reloc_howto_type *howto, asection *input_section,
1569 bfd_byte *contents, bfd_vma r_offset,
1570 bfd_signed_vma r_addend, bfd_vma relocation,
1571 const char *symname, asection *symsec,
1572 char **error_message)
3c3bdf30
NC		 1573{
1574 bfd_reloc_status_type r = bfd_reloc_ok;
1575 bfd_vma addr
1576 = (input_section->output_section->vma
1577 + input_section->output_offset
1578 + r_offset);
1579 bfd_signed_vma srel
1580 = (bfd_signed_vma) relocation + r_addend;
1581
1582 switch (howto->type)
1583 {
1584 /* All these are PC-relative. */
f60ebe14 1585 case R_MMIX_PUSHJ_STUBBABLE:
3c3bdf30
NC		 1586 case R_MMIX_PUSHJ:
1587 case R_MMIX_CBRANCH:
1588 case R_MMIX_ADDR19:
1589 case R_MMIX_GETA:
1590 case R_MMIX_ADDR27:
1591 case R_MMIX_JMP:
1592 contents += r_offset;
1593
1594 srel -= (input_section->output_section->vma
1595 + input_section->output_offset
1596 + r_offset);
1597
1598 r = mmix_elf_perform_relocation (input_section, howto, contents,
18978b27 1599 addr, srel, error_message);
3c3bdf30
NC		 1600 break;
1601
930b4cb2
HPN		 1602 case R_MMIX_BASE_PLUS_OFFSET:
1603 if (symsec == NULL)
1604 return bfd_reloc_undefined;
1605
1606 /* Check that we're not relocating against a register symbol. */
1607 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1608 MMIX_REG_CONTENTS_SECTION_NAME) == 0
1609 || strcmp (bfd_get_section_name (symsec->owner, symsec),
1610 MMIX_REG_SECTION_NAME) == 0)
1611 {
1612 /* Note: This is separated out into two messages in order
1613 to ease the translation into other languages. */
1614 if (symname == NULL || *symname == 0)
1615 (*_bfd_error_handler)
1616 (_("%s: base-plus-offset relocation against register symbol: (unknown) in %s"),
1617 bfd_get_filename (input_section->owner),
1618 bfd_get_section_name (symsec->owner, symsec));
1619 else
1620 (*_bfd_error_handler)
1621 (_("%s: base-plus-offset relocation against register symbol: %s in %s"),
1622 bfd_get_filename (input_section->owner), symname,
1623 bfd_get_section_name (symsec->owner, symsec));
1624 return bfd_reloc_overflow;
1625 }
1626 goto do_mmix_reloc;
1627
3c3bdf30
NC		 1628 case R_MMIX_REG_OR_BYTE:
1629 case R_MMIX_REG:
1630 /* For now, we handle these alike. They must refer to an register
1631 symbol, which is either relative to the register section and in
1632 the range 0..255, or is in the register contents section with vma
1633 regno * 8. */
1634
1635 /* FIXME: A better way to check for reg contents section?
1636 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */
1637 if (symsec == NULL)
1638 return bfd_reloc_undefined;
1639
1640 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1641 MMIX_REG_CONTENTS_SECTION_NAME) == 0)
1642 {
1643 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
1644 {
1645 /* The bfd_reloc_outofrange return value, though intuitively
1646 a better value, will not get us an error. */
1647 return bfd_reloc_overflow;
1648 }
1649 srel /= 8;
1650 }
1651 else if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1652 MMIX_REG_SECTION_NAME) == 0)
1653 {
1654 if (srel < 0 || srel > 255)
1655 /* The bfd_reloc_outofrange return value, though intuitively a
1656 better value, will not get us an error. */
1657 return bfd_reloc_overflow;
1658 }
1659 else
1660 {
930b4cb2 1661 /* Note: This is separated out into two messages in order
ca09e32b
NC		 1662 to ease the translation into other languages. */
1663 if (symname == NULL || *symname == 0)
1664 (*_bfd_error_handler)
1665 (_("%s: register relocation against non-register symbol: (unknown) in %s"),
1666 bfd_get_filename (input_section->owner),
1667 bfd_get_section_name (symsec->owner, symsec));
1668 else
1669 (*_bfd_error_handler)
1670 (_("%s: register relocation against non-register symbol: %s in %s"),
1671 bfd_get_filename (input_section->owner), symname,
1672 bfd_get_section_name (symsec->owner, symsec));
3c3bdf30
NC		 1673
1674 /* The bfd_reloc_outofrange return value, though intuitively a
1675 better value, will not get us an error. */
1676 return bfd_reloc_overflow;
1677 }
930b4cb2 1678 do_mmix_reloc:
3c3bdf30
NC		 1679 contents += r_offset;
1680 r = mmix_elf_perform_relocation (input_section, howto, contents,
18978b27 1681 addr, srel, error_message);
3c3bdf30
NC		 1682 break;
1683
1684 case R_MMIX_LOCAL:
1685 /* This isn't a real relocation, it's just an assertion that the
1686 final relocation value corresponds to a local register. We
1687 ignore the actual relocation; nothing is changed. */
1688 {
1689 asection *regsec
1690 = bfd_get_section_by_name (input_section->output_section->owner,
1691 MMIX_REG_CONTENTS_SECTION_NAME);
1692 bfd_vma first_global;
1693
1694 /* Check that this is an absolute value, or a reference to the
1695 register contents section or the register (symbol) section.
1696 Absolute numbers can get here as undefined section. Undefined
1697 symbols are signalled elsewhere, so there's no conflict in us
1698 accidentally handling it. */
1699 if (!bfd_is_abs_section (symsec)
1700 && !bfd_is_und_section (symsec)
1701 && strcmp (bfd_get_section_name (symsec->owner, symsec),
1702 MMIX_REG_CONTENTS_SECTION_NAME) != 0
1703 && strcmp (bfd_get_section_name (symsec->owner, symsec),
1704 MMIX_REG_SECTION_NAME) != 0)
1705 {
1706 (*_bfd_error_handler)
1707 (_("%s: directive LOCAL valid only with a register or absolute value"),
1708 bfd_get_filename (input_section->owner));
1709
1710 return bfd_reloc_overflow;
1711 }
1712
1713 /* If we don't have a register contents section, then $255 is the
1714 first global register. */
1715 if (regsec == NULL)
1716 first_global = 255;
1717 else
1718 {
a0f49396
NC		 1719 first_global
1720 = bfd_get_section_vma (input_section->output_section->owner,
1721 regsec) / 8;
3c3bdf30
NC		 1722 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1723 MMIX_REG_CONTENTS_SECTION_NAME) == 0)
1724 {
1725 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
1726 /* The bfd_reloc_outofrange return value, though
1727 intuitively a better value, will not get us an error. */
1728 return bfd_reloc_overflow;
1729 srel /= 8;
1730 }
1731 }
1732
1733 if ((bfd_vma) srel >= first_global)
1734 {
1735 /* FIXME: Better error message. */
1736 (*_bfd_error_handler)
1737 (_("%s: LOCAL directive: Register $%ld is not a local register. First global register is $%ld."),
1738 bfd_get_filename (input_section->owner), (long) srel, (long) first_global);
1739
1740 return bfd_reloc_overflow;
1741 }
1742 }
1743 r = bfd_reloc_ok;
1744 break;
1745
1746 default:
1747 r = _bfd_final_link_relocate (howto, input_section->owner, input_section,
1748 contents, r_offset,
1749 relocation, r_addend);
1750 }
1751
1752 return r;
1753}
e06fcc86 1754\f
3c3bdf30
NC		 1755/* Return the section that should be marked against GC for a given
1756 relocation. */
1757
1758static asection *
07adf181
AM		 1759mmix_elf_gc_mark_hook (asection *sec,
1760 struct bfd_link_info *info,
1761 Elf_Internal_Rela *rel,
1762 struct elf_link_hash_entry *h,
1763 Elf_Internal_Sym *sym)
3c3bdf30
NC		 1764{
1765 if (h != NULL)
07adf181
AM		 1766 switch (ELF64_R_TYPE (rel->r_info))
1767 {
1768 case R_MMIX_GNU_VTINHERIT:
1769 case R_MMIX_GNU_VTENTRY:
1770 return NULL;
1771 }
3c3bdf30 1772
07adf181 1773 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
3c3bdf30 1774}
930b4cb2
HPN		 1775
1776/* Update relocation info for a GC-excluded section. We could supposedly
1777 perform the allocation after GC, but there's no suitable hook between
1778 GC (or section merge) and the point when all input sections must be
1779 present. Better to waste some memory and (perhaps) a little time. */
1780
b34976b6 1781static bfd_boolean
07adf181
AM		 1782mmix_elf_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED,
1783 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1784 asection *sec,
1785 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED)
930b4cb2
HPN		 1786{
1787 struct bpo_reloc_section_info *bpodata
f0abc2a1 1788 = mmix_elf_section_data (sec)->bpo.reloc;
930b4cb2
HPN		 1789 asection *allocated_gregs_section;
1790
1791 /* If no bpodata here, we have nothing to do. */
1792 if (bpodata == NULL)
b34976b6 1793 return TRUE;
930b4cb2
HPN		 1794
1795 allocated_gregs_section = bpodata->bpo_greg_section;
1796
f0abc2a1 1797 mmix_elf_section_data (allocated_gregs_section)->bpo.greg->n_bpo_relocs
930b4cb2
HPN		 1798 -= bpodata->n_bpo_relocs_this_section;
1799
b34976b6 1800 return TRUE;
930b4cb2 1801}
e06fcc86 1802\f
3c3bdf30
NC		 1803/* Sort register relocs to come before expanding relocs. */
1804
1805static int
2c3fc389 1806mmix_elf_sort_relocs (const void * p1, const void * p2)
3c3bdf30
NC		 1807{
1808 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1;
1809 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2;
1810 int r1_is_reg, r2_is_reg;
1811
1812 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive
1813 insns. */
1814 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3))
1815 return 1;
1816 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3))
1817 return -1;
1818
1819 r1_is_reg
1820 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE
1821 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG);
1822 r2_is_reg
1823 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE
1824 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG);
1825 if (r1_is_reg != r2_is_reg)
1826 return r2_is_reg - r1_is_reg;
1827
1828 /* Neither or both are register relocs. Then sort on full offset. */
1829 if (r1->r_offset > r2->r_offset)
1830 return 1;
1831 else if (r1->r_offset < r2->r_offset)
1832 return -1;
1833 return 0;
1834}
1835
930b4cb2
HPN		 1836/* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */
1837
b34976b6 1838static bfd_boolean
2c3fc389
NC		 1839mmix_elf_check_common_relocs (bfd *abfd,
1840 struct bfd_link_info *info,
1841 asection *sec,
1842 const Elf_Internal_Rela *relocs)
930b4cb2
HPN		 1843{
1844 bfd *bpo_greg_owner = NULL;
1845 asection *allocated_gregs_section = NULL;
1846 struct bpo_greg_section_info *gregdata = NULL;
1847 struct bpo_reloc_section_info *bpodata = NULL;
1848 const Elf_Internal_Rela *rel;
1849 const Elf_Internal_Rela *rel_end;
1850
930b4cb2
HPN		 1851 /* We currently have to abuse this COFF-specific member, since there's
1852 no target-machine-dedicated member. There's no alternative outside
1853 the bfd_link_info struct; we can't specialize a hash-table since
1854 they're different between ELF and mmo. */
1855 bpo_greg_owner = (bfd *) info->base_file;
1856
1857 rel_end = relocs + sec->reloc_count;
1858 for (rel = relocs; rel < rel_end; rel++)
1859 {
1860 switch (ELF64_R_TYPE (rel->r_info))
1861 {
1862 /* This relocation causes a GREG allocation. We need to count
1863 them, and we need to create a section for them, so we need an
1864 object to fake as the owner of that section. We can't use
1865 the ELF dynobj for this, since the ELF bits assume lots of
1866 DSO-related stuff if that member is non-NULL. */
1867 case R_MMIX_BASE_PLUS_OFFSET:
f60ebe14
HPN		 1868 /* We don't do anything with this reloc for a relocatable link. */
1869 if (info->relocatable)
1870 break;
1871
930b4cb2
HPN		 1872 if (bpo_greg_owner == NULL)
1873 {
1874 bpo_greg_owner = abfd;
2c3fc389 1875 info->base_file = bpo_greg_owner;
930b4cb2
HPN		 1876 }
1877
4fa5c2a8
HPN		 1878 if (allocated_gregs_section == NULL)
1879 allocated_gregs_section
1880 = bfd_get_section_by_name (bpo_greg_owner,
1881 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
1882
930b4cb2
HPN		 1883 if (allocated_gregs_section == NULL)
1884 {
1885 allocated_gregs_section
3496cb2a
L		 1886 = bfd_make_section_with_flags (bpo_greg_owner,
1887 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME,
1888 (SEC_HAS_CONTENTS
1889 | SEC_IN_MEMORY
1890 | SEC_LINKER_CREATED));
930b4cb2
HPN		 1891 /* Setting both SEC_ALLOC and SEC_LOAD means the section is
1892 treated like any other section, and we'd get errors for
1893 address overlap with the text section. Let's set none of
1894 those flags, as that is what currently happens for usual
1895 GREG allocations, and that works. */
1896 if (allocated_gregs_section == NULL
930b4cb2
HPN		 1897 || !bfd_set_section_alignment (bpo_greg_owner,
1898 allocated_gregs_section,
1899 3))
b34976b6 1900 return FALSE;
930b4cb2
HPN		 1901
1902 gregdata = (struct bpo_greg_section_info *)
1903 bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info));
1904 if (gregdata == NULL)
b34976b6 1905 return FALSE;
f0abc2a1
AM		 1906 mmix_elf_section_data (allocated_gregs_section)->bpo.greg
1907 = gregdata;
930b4cb2
HPN		 1908 }
1909 else if (gregdata == NULL)
f0abc2a1
AM		 1910 gregdata
1911 = mmix_elf_section_data (allocated_gregs_section)->bpo.greg;
930b4cb2
HPN		 1912
1913 /* Get ourselves some auxiliary info for the BPO-relocs. */
1914 if (bpodata == NULL)
1915 {
1916 /* No use doing a separate iteration pass to find the upper
1917 limit - just use the number of relocs. */
1918 bpodata = (struct bpo_reloc_section_info *)
1919 bfd_alloc (bpo_greg_owner,
1920 sizeof (struct bpo_reloc_section_info)
1921 * (sec->reloc_count + 1));
1922 if (bpodata == NULL)
b34976b6 1923 return FALSE;
f0abc2a1 1924 mmix_elf_section_data (sec)->bpo.reloc = bpodata;
930b4cb2
HPN		 1925 bpodata->first_base_plus_offset_reloc
1926 = bpodata->bpo_index
1927 = gregdata->n_max_bpo_relocs;
1928 bpodata->bpo_greg_section
1929 = allocated_gregs_section;
4fa5c2a8 1930 bpodata->n_bpo_relocs_this_section = 0;
930b4cb2
HPN		 1931 }
1932
1933 bpodata->n_bpo_relocs_this_section++;
1934 gregdata->n_max_bpo_relocs++;
1935
1936 /* We don't get another chance to set this before GC; we've not
f60ebe14 1937 set up any hook that runs before GC. */
930b4cb2
HPN		 1938 gregdata->n_bpo_relocs
1939 = gregdata->n_max_bpo_relocs;
1940 break;
f60ebe14
HPN		 1941
1942 case R_MMIX_PUSHJ_STUBBABLE:
1943 mmix_elf_section_data (sec)->pjs.n_pushj_relocs++;
1944 break;
930b4cb2
HPN		 1945 }
1946 }
1947
f60ebe14
HPN		 1948 /* Allocate per-reloc stub storage and initialize it to the max stub
1949 size. */
1950 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0)
1951 {
1952 size_t i;
1953
1954 mmix_elf_section_data (sec)->pjs.stub_size
1955 = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs
1956 * sizeof (mmix_elf_section_data (sec)
1957 ->pjs.stub_size[0]));
1958 if (mmix_elf_section_data (sec)->pjs.stub_size == NULL)
1959 return FALSE;
1960
1961 for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++)
1962 mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE;
1963 }
1964
b34976b6 1965 return TRUE;
930b4cb2
HPN		 1966}
1967
3c3bdf30
NC		 1968/* Look through the relocs for a section during the first phase. */
1969
b34976b6 1970static bfd_boolean
2c3fc389
NC		 1971mmix_elf_check_relocs (bfd *abfd,
1972 struct bfd_link_info *info,
1973 asection *sec,
1974 const Elf_Internal_Rela *relocs)
3c3bdf30
NC		 1975{
1976 Elf_Internal_Shdr *symtab_hdr;
5582a088 1977 struct elf_link_hash_entry **sym_hashes;
3c3bdf30
NC		 1978 const Elf_Internal_Rela *rel;
1979 const Elf_Internal_Rela *rel_end;
1980
3c3bdf30
NC		 1981 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1982 sym_hashes = elf_sym_hashes (abfd);
3c3bdf30
NC		 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. */
2c3fc389 1986 qsort ((void *) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
3c3bdf30
NC		 1987 mmix_elf_sort_relocs);
1988
930b4cb2
HPN		 1989 /* Do the common part. */
1990 if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs))
b34976b6 1991 return FALSE;
930b4cb2 1992
f60ebe14
HPN		 1993 if (info->relocatable)
1994 return TRUE;
1995
3c3bdf30
NC		 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
973a3492
L		 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;
81fbe831
AM		 2011
2012 /* PR15323, ref flags aren't set for references in the same
2013 object. */
2014 h->root.non_ir_ref = 1;
973a3492 2015 }
3c3bdf30
NC		 2016
2017 switch (ELF64_R_TYPE (rel->r_info))
930b4cb2 2018 {
3c3bdf30
NC		 2019 /* This relocation describes the C++ object vtable hierarchy.
2020 Reconstruct it for later use during GC. */
2021 case R_MMIX_GNU_VTINHERIT:
c152c796 2022 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
b34976b6 2023 return FALSE;
3c3bdf30
NC		 2024 break;
2025
2026 /* This relocation describes which C++ vtable entries are actually
2027 used. Record for later use during GC. */
2028 case R_MMIX_GNU_VTENTRY:
d17e0c6e
JB		 2029 BFD_ASSERT (h != NULL);
2030 if (h != NULL
2031 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
b34976b6 2032 return FALSE;
3c3bdf30 2033 break;
930b4cb2
HPN		 2034 }
2035 }
2036
b34976b6 2037 return TRUE;
930b4cb2
HPN		 2038}
2039
2040/* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo.
2041 Copied from elf_link_add_object_symbols. */
2042
b34976b6 2043bfd_boolean
2c3fc389 2044_bfd_mmix_check_all_relocs (bfd *abfd, struct bfd_link_info *info)
930b4cb2
HPN		 2045{
2046 asection *o;
2047
2048 for (o = abfd->sections; o != NULL; o = o->next)
2049 {
2050 Elf_Internal_Rela *internal_relocs;
b34976b6 2051 bfd_boolean ok;
930b4cb2
HPN		 2052
2053 if ((o->flags & SEC_RELOC) == 0
2054 || o->reloc_count == 0
2055 || ((info->strip == strip_all || info->strip == strip_debugger)
2056 && (o->flags & SEC_DEBUGGING) != 0)
2057 || bfd_is_abs_section (o->output_section))
2058 continue;
2059
2060 internal_relocs
2c3fc389 2061 = _bfd_elf_link_read_relocs (abfd, o, NULL,
45d6a902
AM		 2062 (Elf_Internal_Rela *) NULL,
2063 info->keep_memory);
930b4cb2 2064 if (internal_relocs == NULL)
b34976b6 2065 return FALSE;
930b4cb2
HPN		 2066
2067 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs);
2068
2069 if (! info->keep_memory)
2070 free (internal_relocs);
2071
2072 if (! ok)
b34976b6 2073 return FALSE;
3c3bdf30
NC		 2074 }
2075
b34976b6 2076 return TRUE;
3c3bdf30 2077}
e06fcc86 2078\f
3c3bdf30
NC		 2079/* Change symbols relative to the reg contents section to instead be to
2080 the register section, and scale them down to correspond to the register
2081 number. */
2082
6e0b88f1 2083static int
2c3fc389
NC		 2084mmix_elf_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED,
2085 const char *name ATTRIBUTE_UNUSED,
2086 Elf_Internal_Sym *sym,
2087 asection *input_sec,
2088 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED)
3c3bdf30
NC		 2089{
2090 if (input_sec != NULL
2091 && input_sec->name != NULL
2092 && ELF_ST_TYPE (sym->st_info) != STT_SECTION
2093 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0)
2094 {
2095 sym->st_value /= 8;
2096 sym->st_shndx = SHN_REGISTER;
2097 }
2098
6e0b88f1 2099 return 1;
3c3bdf30
NC		 2100}
2101
2102/* We fake a register section that holds values that are register numbers.
2103 Having a SHN_REGISTER and register section translates better to other
2104 formats (e.g. mmo) than for example a STT_REGISTER attribute.
2105 This section faking is based on a construct in elf32-mips.c. */
2106static asection mmix_elf_reg_section;
2107static asymbol mmix_elf_reg_section_symbol;
2108static asymbol *mmix_elf_reg_section_symbol_ptr;
2109
f60ebe14 2110/* Handle the special section numbers that a symbol may use. */
3c3bdf30
NC		 2111
2112void
2113mmix_elf_symbol_processing (abfd, asym)
2114 bfd *abfd ATTRIBUTE_UNUSED;
2115 asymbol *asym;
2116{
2117 elf_symbol_type *elfsym;
2118
2119 elfsym = (elf_symbol_type *) asym;
2120 switch (elfsym->internal_elf_sym.st_shndx)
2121 {
2122 case SHN_REGISTER:
2123 if (mmix_elf_reg_section.name == NULL)
2124 {
2125 /* Initialize the register section. */
2126 mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME;
2127 mmix_elf_reg_section.flags = SEC_NO_FLAGS;
2128 mmix_elf_reg_section.output_section = &mmix_elf_reg_section;
2129 mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol;
2130 mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr;
2131 mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME;
2132 mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM;
2133 mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section;
2134 mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol;
2135 }
2136 asym->section = &mmix_elf_reg_section;
2137 break;
2138
2139 default:
2140 break;
2141 }
2142}
2143
2144/* Given a BFD section, try to locate the corresponding ELF section
2145 index. */
2146
b34976b6 2147static bfd_boolean
2c3fc389
NC		 2148mmix_elf_section_from_bfd_section (bfd * abfd ATTRIBUTE_UNUSED,
2149 asection * sec,
2150 int * retval)
3c3bdf30
NC		 2151{
2152 if (strcmp (bfd_get_section_name (abfd, sec), MMIX_REG_SECTION_NAME) == 0)
2153 *retval = SHN_REGISTER;
2154 else
b34976b6 2155 return FALSE;
3c3bdf30 2156
b34976b6 2157 return TRUE;
3c3bdf30
NC		 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
2c3fc389
NC		 2167static bfd_boolean
2168mmix_elf_add_symbol_hook (bfd *abfd,
2169 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2170 Elf_Internal_Sym *sym,
2171 const char **namep ATTRIBUTE_UNUSED,
2172 flagword *flagsp ATTRIBUTE_UNUSED,
2173 asection **secp,
2174 bfd_vma *valp ATTRIBUTE_UNUSED)
3c3bdf30
NC		 2175{
2176 if (sym->st_shndx == SHN_REGISTER)
46fda84e
AM		 2177 {
2178 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME);
2179 (*secp)->flags |= SEC_LINKER_CREATED;
2180 }
3c3bdf30 2181 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.'
0112cd26 2182 && CONST_STRNEQ (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX))
3c3bdf30
NC		 2183 {
2184 /* See if we have another one. */
4ab82700
AM		 2185 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash,
2186 *namep,
b34976b6
AM		 2187 FALSE,
2188 FALSE,
2189 FALSE);
3c3bdf30 2190
4ab82700 2191 if (h != NULL && h->type != bfd_link_hash_undefined)
3c3bdf30
NC		 2192 {
2193 /* How do we get the asymbol (or really: the filename) from h?
4ab82700 2194 h->u.def.section->owner is NULL. */
3c3bdf30
NC		 2195 ((*_bfd_error_handler)
2196 (_("%s: Error: multiple definition of `%s'; start of %s is set in a earlier linked file\n"),
2197 bfd_get_filename (abfd), *namep,
2198 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)));
2199 bfd_set_error (bfd_error_bad_value);
b34976b6 2200 return FALSE;
3c3bdf30
NC		 2201 }
2202 }
2203
b34976b6 2204 return TRUE;
3c3bdf30
NC		 2205}
2206
2207/* We consider symbols matching "L.*:[0-9]+" to be local symbols. */
2208
2c3fc389
NC		 2209static bfd_boolean
2210mmix_elf_is_local_label_name (bfd *abfd, const char *name)
3c3bdf30
NC		 2211{
2212 const char *colpos;
2213 int digits;
2214
2215 /* Also include the default local-label definition. */
2216 if (_bfd_elf_is_local_label_name (abfd, name))
b34976b6 2217 return TRUE;
3c3bdf30
NC		 2218
2219 if (*name != 'L')
b34976b6 2220 return FALSE;
3c3bdf30
NC		 2221
2222 /* If there's no ":", or more than one, it's not a local symbol. */
2223 colpos = strchr (name, ':');
2224 if (colpos == NULL || strchr (colpos + 1, ':') != NULL)
b34976b6 2225 return FALSE;
3c3bdf30
NC		 2226
2227 /* Check that there are remaining characters and that they are digits. */
2228 if (colpos[1] == 0)
b34976b6 2229 return FALSE;
3c3bdf30
NC		 2230
2231 digits = strspn (colpos + 1, "0123456789");
2232 return digits != 0 && colpos[1 + digits] == 0;
2233}
2234
2235/* We get rid of the register section here. */
2236
b34976b6 2237bfd_boolean
2c3fc389 2238mmix_elf_final_link (bfd *abfd, struct bfd_link_info *info)
3c3bdf30
NC		 2239{
2240 /* We never output a register section, though we create one for
2241 temporary measures. Check that nobody entered contents into it. */
2242 asection *reg_section;
3c3bdf30
NC		 2243
2244 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME);
2245
2246 if (reg_section != NULL)
2247 {
2248 /* FIXME: Pass error state gracefully. */
2249 if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS)
2250 _bfd_abort (__FILE__, __LINE__, _("Register section has contents\n"));
2251
46fda84e
AM		 2252 /* Really remove the section, if it hasn't already been done. */
2253 if (!bfd_section_removed_from_list (abfd, reg_section))
2254 {
2255 bfd_section_list_remove (abfd, reg_section);
2256 --abfd->section_count;
2257 }
3c3bdf30
NC		 2258 }
2259
c152c796 2260 if (! bfd_elf_final_link (abfd, info))
b34976b6 2261 return FALSE;
3c3bdf30 2262
930b4cb2
HPN		 2263 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by
2264 the regular linker machinery. We do it here, like other targets with
2265 special sections. */
2266 if (info->base_file != NULL)
2267 {
2268 asection *greg_section
2269 = bfd_get_section_by_name ((bfd *) info->base_file,
2270 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2271 if (!bfd_set_section_contents (abfd,
2272 greg_section->output_section,
2273 greg_section->contents,
2274 (file_ptr) greg_section->output_offset,
eea6121a 2275 greg_section->size))
b34976b6 2276 return FALSE;
930b4cb2 2277 }
b34976b6 2278 return TRUE;
930b4cb2
HPN		 2279}
2280
f60ebe14 2281/* We need to include the maximum size of PUSHJ-stubs in the initial
eea6121a 2282 section size. This is expected to shrink during linker relaxation. */
f60ebe14
HPN		 2283
2284static void
2c3fc389
NC		 2285mmix_set_relaxable_size (bfd *abfd ATTRIBUTE_UNUSED,
2286 asection *sec,
2287 void *ptr)
f60ebe14
HPN		 2288{
2289 struct bfd_link_info *info = ptr;
2290
2291 /* Make sure we only do this for section where we know we want this,
2292 otherwise we might end up resetting the size of COMMONs. */
2293 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)
2294 return;
2295
1a23a9e6 2296 sec->rawsize = sec->size;
eea6121a
AM		 2297 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs
2298 * MAX_PUSHJ_STUB_SIZE);
f60ebe14
HPN		 2299
2300 /* For use in relocatable link, we start with a max stubs size. See
2301 mmix_elf_relax_section. */
2302 if (info->relocatable && sec->output_section)
2303 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum
2304 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs
2305 * MAX_PUSHJ_STUB_SIZE);
2306}
2307
930b4cb2
HPN		 2308/* Initialize stuff for the linker-generated GREGs to match
2309 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */
2310
b34976b6 2311bfd_boolean
2c3fc389
NC		 2312_bfd_mmix_before_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED,
2313 struct bfd_link_info *info)
930b4cb2
HPN		 2314{
2315 asection *bpo_gregs_section;
2316 bfd *bpo_greg_owner;
2317 struct bpo_greg_section_info *gregdata;
2318 size_t n_gregs;
2319 bfd_vma gregs_size;
2320 size_t i;
2321 size_t *bpo_reloc_indexes;
f60ebe14
HPN		 2322 bfd *ibfd;
2323
2324 /* Set the initial size of sections. */
c72f2fb2 2325 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
f60ebe14 2326 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info);
930b4cb2
HPN		 2327
2328 /* The bpo_greg_owner bfd is supposed to have been set by
2329 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen.
2330 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */
2331 bpo_greg_owner = (bfd *) info->base_file;
2332 if (bpo_greg_owner == NULL)
b34976b6 2333 return TRUE;
930b4cb2
HPN		 2334
2335 bpo_gregs_section
2336 = bfd_get_section_by_name (bpo_greg_owner,
2337 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2338
930b4cb2 2339 if (bpo_gregs_section == NULL)
b34976b6 2340 return TRUE;
930b4cb2
HPN		 2341
2342 /* We use the target-data handle in the ELF section data. */
f0abc2a1 2343 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
930b4cb2 2344 if (gregdata == NULL)
b34976b6 2345 return FALSE;
930b4cb2
HPN		 2346
2347 n_gregs = gregdata->n_bpo_relocs;
2348 gregdata->n_allocated_bpo_gregs = n_gregs;
2349
2350 /* When this reaches zero during relaxation, all entries have been
2351 filled in and the size of the linker gregs can be calculated. */
2352 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs;
2353
2354 /* Set the zeroth-order estimate for the GREGs size. */
2355 gregs_size = n_gregs * 8;
2356
2357 if (!bfd_set_section_size (bpo_greg_owner, bpo_gregs_section, gregs_size))
b34976b6 2358 return FALSE;
930b4cb2
HPN		 2359
2360 /* Allocate and set up the GREG arrays. They're filled in at relaxation
2361 time. Note that we must use the max number ever noted for the array,
2362 since the index numbers were created before GC. */
2363 gregdata->reloc_request
2364 = bfd_zalloc (bpo_greg_owner,
2365 sizeof (struct bpo_reloc_request)
2366 * gregdata->n_max_bpo_relocs);
2367
2368 gregdata->bpo_reloc_indexes
2369 = bpo_reloc_indexes
2370 = bfd_alloc (bpo_greg_owner,
2371 gregdata->n_max_bpo_relocs
2372 * sizeof (size_t));
2373 if (bpo_reloc_indexes == NULL)
b34976b6 2374 return FALSE;
930b4cb2
HPN		 2375
2376 /* The default order is an identity mapping. */
2377 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2378 {
2379 bpo_reloc_indexes[i] = i;
2380 gregdata->reloc_request[i].bpo_reloc_no = i;
2381 }
2382
b34976b6 2383 return TRUE;
3c3bdf30 2384}
e06fcc86 2385\f
930b4cb2
HPN		 2386/* Fill in contents in the linker allocated gregs. Everything is
2387 calculated at this point; we just move the contents into place here. */
2388
b34976b6 2389bfd_boolean
2c3fc389
NC		 2390_bfd_mmix_after_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED,
2391 struct bfd_link_info *link_info)
930b4cb2
HPN		 2392{
2393 asection *bpo_gregs_section;
2394 bfd *bpo_greg_owner;
2395 struct bpo_greg_section_info *gregdata;
2396 size_t n_gregs;
2397 size_t i, j;
2398 size_t lastreg;
2399 bfd_byte *contents;
2400
2401 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs
2402 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such
2403 object, there was no R_MMIX_BASE_PLUS_OFFSET. */
2404 bpo_greg_owner = (bfd *) link_info->base_file;
2405 if (bpo_greg_owner == NULL)
b34976b6 2406 return TRUE;
930b4cb2
HPN		 2407
2408 bpo_gregs_section
2409 = bfd_get_section_by_name (bpo_greg_owner,
2410 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2411
2412 /* This can't happen without DSO handling. When DSOs are handled
2413 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such
2414 section. */
2415 if (bpo_gregs_section == NULL)
b34976b6 2416 return TRUE;
930b4cb2
HPN		 2417
2418 /* We use the target-data handle in the ELF section data. */
2419
f0abc2a1 2420 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
930b4cb2 2421 if (gregdata == NULL)
b34976b6 2422 return FALSE;
930b4cb2
HPN		 2423
2424 n_gregs = gregdata->n_allocated_bpo_gregs;
2425
2426 bpo_gregs_section->contents
eea6121a 2427 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size);
930b4cb2 2428 if (contents == NULL)
b34976b6 2429 return FALSE;
930b4cb2 2430
7e799044
HPN		 2431 /* Sanity check: If these numbers mismatch, some relocation has not been
2432 accounted for and the rest of gregdata is probably inconsistent.
2433 It's a bug, but it's more helpful to identify it than segfaulting
2434 below. */
2435 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round
2436 != gregdata->n_bpo_relocs)
2437 {
2438 (*_bfd_error_handler)
2439 (_("Internal inconsistency: remaining %u != max %u.\n\
2440 Please report this bug."),
2441 gregdata->n_remaining_bpo_relocs_this_relaxation_round,
2442 gregdata->n_bpo_relocs);
b34976b6 2443 return FALSE;
7e799044
HPN		 2444 }
2445
930b4cb2
HPN		 2446 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++)
2447 if (gregdata->reloc_request[i].regindex != lastreg)
2448 {
2449 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value,
2450 contents + j * 8);
2451 lastreg = gregdata->reloc_request[i].regindex;
2452 j++;
2453 }
2454
b34976b6 2455 return TRUE;
930b4cb2
HPN		 2456}
2457
2458/* Sort valid relocs to come before non-valid relocs, then on increasing
2459 value. */
2460
2461static int
2c3fc389 2462bpo_reloc_request_sort_fn (const void * p1, const void * p2)
930b4cb2
HPN		 2463{
2464 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1;
2465 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2;
2466
2467 /* Primary function is validity; non-valid relocs sorted after valid
2468 ones. */
2469 if (r1->valid != r2->valid)
2470 return r2->valid - r1->valid;
2471
4fa5c2a8
HPN		 2472 /* Then sort on value. Don't simplify and return just the difference of
2473 the values: the upper bits of the 64-bit value would be truncated on
2474 a host with 32-bit ints. */
930b4cb2 2475 if (r1->value != r2->value)
4fa5c2a8 2476 return r1->value > r2->value ? 1 : -1;
930b4cb2 2477
dfbbae4c
HPN		 2478 /* As a last re-sort, use the relocation number, so we get a stable
2479 sort. The *addresses* aren't stable since items are swapped during
2480 sorting. It depends on the qsort implementation if this actually
2481 happens. */
2482 return r1->bpo_reloc_no > r2->bpo_reloc_no
2483 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0);
930b4cb2
HPN		 2484}
2485
4fa5c2a8
HPN		 2486/* For debug use only. Dumps the global register allocations resulting
2487 from base-plus-offset relocs. */
2488
2489void
2490mmix_dump_bpo_gregs (link_info, pf)
2491 struct bfd_link_info *link_info;
2492 bfd_error_handler_type pf;
2493{
2494 bfd *bpo_greg_owner;
2495 asection *bpo_gregs_section;
2496 struct bpo_greg_section_info *gregdata;
2497 unsigned int i;
2498
2499 if (link_info == NULL || link_info->base_file == NULL)
2500 return;
2501
2502 bpo_greg_owner = (bfd *) link_info->base_file;
2503
2504 bpo_gregs_section
2505 = bfd_get_section_by_name (bpo_greg_owner,
2506 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2507
2508 if (bpo_gregs_section == NULL)
2509 return;
2510
f0abc2a1 2511 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
4fa5c2a8
HPN		 2512 if (gregdata == NULL)
2513 return;
2514
2515 if (pf == NULL)
2516 pf = _bfd_error_handler;
2517
2518 /* These format strings are not translated. They are for debug purposes
2519 only and never displayed to an end user. Should they escape, we
2520 surely want them in original. */
2521 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\
2522 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs,
2523 gregdata->n_max_bpo_relocs,
2524 gregdata->n_remaining_bpo_relocs_this_relaxation_round,
2525 gregdata->n_allocated_bpo_gregs);
2526
2527 if (gregdata->reloc_request)
2528 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2529 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n",
2530 i,
cf3d882d
AM		 2531 (gregdata->bpo_reloc_indexes != NULL
2532 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1),
4fa5c2a8
HPN		 2533 gregdata->reloc_request[i].bpo_reloc_no,
2534 gregdata->reloc_request[i].valid,
2535
2536 (unsigned long) (gregdata->reloc_request[i].value >> 32),
2537 (unsigned long) gregdata->reloc_request[i].value,
2538 gregdata->reloc_request[i].regindex,
2539 gregdata->reloc_request[i].offset);
2540}
2541
930b4cb2
HPN		 2542/* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and
2543 when the last such reloc is done, an index-array is sorted according to
2544 the values and iterated over to produce register numbers (indexed by 0
2545 from the first allocated register number) and offsets for use in real
80f540b7 2546 relocation. (N.B.: Relocatable runs are handled, not just punted.)
930b4cb2 2547
f60ebe14
HPN		 2548 PUSHJ stub accounting is also done here.
2549
930b4cb2
HPN		 2550 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
2551
b34976b6 2552static bfd_boolean
2c3fc389
NC		 2553mmix_elf_relax_section (bfd *abfd,
2554 asection *sec,
2555 struct bfd_link_info *link_info,
2556 bfd_boolean *again)
930b4cb2 2557{
930b4cb2 2558 Elf_Internal_Shdr *symtab_hdr;
930b4cb2 2559 Elf_Internal_Rela *internal_relocs;
930b4cb2
HPN		 2560 Elf_Internal_Rela *irel, *irelend;
2561 asection *bpo_gregs_section = NULL;
2562 struct bpo_greg_section_info *gregdata;
2563 struct bpo_reloc_section_info *bpodata
f0abc2a1 2564 = mmix_elf_section_data (sec)->bpo.reloc;
f60ebe14
HPN		 2565 /* The initialization is to quiet compiler warnings. The value is to
2566 spot a missing actual initialization. */
2567 size_t bpono = (size_t) -1;
2568 size_t pjsno = 0;
6cdc0ccc 2569 Elf_Internal_Sym *isymbuf = NULL;
1a23a9e6 2570 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size;
f60ebe14
HPN		 2571
2572 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0;
930b4cb2
HPN		 2573
2574 /* Assume nothing changes. */
b34976b6 2575 *again = FALSE;
930b4cb2 2576
f60ebe14
HPN		 2577 /* We don't have to do anything if this section does not have relocs, or
2578 if this is not a code section. */
2579 if ((sec->flags & SEC_RELOC) == 0
930b4cb2
HPN		 2580 || sec->reloc_count == 0
2581 || (sec->flags & SEC_CODE) == 0
2582 || (sec->flags & SEC_LINKER_CREATED) != 0
f60ebe14
HPN		 2583 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs,
2584 then nothing to do. */
2585 || (bpodata == NULL
2586 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0))
b34976b6 2587 return TRUE;
930b4cb2
HPN		 2588
2589 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
930b4cb2 2590
f60ebe14
HPN		 2591 if (bpodata != NULL)
2592 {
2593 bpo_gregs_section = bpodata->bpo_greg_section;
2594 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
2595 bpono = bpodata->first_base_plus_offset_reloc;
2596 }
2597 else
2598 gregdata = NULL;
930b4cb2
HPN		 2599
2600 /* Get a copy of the native relocations. */
2601 internal_relocs
2c3fc389 2602 = _bfd_elf_link_read_relocs (abfd, sec, NULL,
45d6a902
AM		 2603 (Elf_Internal_Rela *) NULL,
2604 link_info->keep_memory);
930b4cb2
HPN		 2605 if (internal_relocs == NULL)
2606 goto error_return;
930b4cb2
HPN		 2607
2608 /* Walk through them looking for relaxing opportunities. */
2609 irelend = internal_relocs + sec->reloc_count;
2610 for (irel = internal_relocs; irel < irelend; irel++)
2611 {
2612 bfd_vma symval;
f60ebe14 2613 struct elf_link_hash_entry *h = NULL;
930b4cb2 2614
f60ebe14
HPN		 2615 /* We only process two relocs. */
2616 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET
2617 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE)
930b4cb2
HPN		 2618 continue;
2619
f60ebe14
HPN		 2620 /* We process relocs in a distinctly different way when this is a
2621 relocatable link (for one, we don't look at symbols), so we avoid
2622 mixing its code with that for the "normal" relaxation. */
2623 if (link_info->relocatable)
2624 {
2625 /* The only transformation in a relocatable link is to generate
2626 a full stub at the location of the stub calculated for the
2627 input section, if the relocated stub location, the end of the
2628 output section plus earlier stubs, cannot be reached. Thus
2629 relocatable linking can only lead to worse code, but it still
2630 works. */
2631 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE)
2632 {
2633 /* If we can reach the end of the output-section and beyond
2634 any current stubs, then we don't need a stub for this
2635 reloc. The relaxed order of output stub allocation may
2636 not exactly match the straightforward order, so we always
2637 assume presence of output stubs, which will allow
2638 relaxation only on relocations indifferent to the
2639 presence of output stub allocations for other relocations
2640 and thus the order of output stub allocation. */
2641 if (bfd_check_overflow (complain_overflow_signed,
2642 19,
2643 0,
2644 bfd_arch_bits_per_address (abfd),
2645 /* Output-stub location. */
1a23a9e6 2646 sec->output_section->rawsize
f60ebe14
HPN		 2647 + (mmix_elf_section_data (sec
2648 ->output_section)
2649 ->pjs.stubs_size_sum)
2650 /* Location of this PUSHJ reloc. */
2651 - (sec->output_offset + irel->r_offset)
2652 /* Don't count *this* stub twice. */
2653 - (mmix_elf_section_data (sec)
2654 ->pjs.stub_size[pjsno]
2655 + MAX_PUSHJ_STUB_SIZE))
2656 == bfd_reloc_ok)
2657 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0;
2658
2659 mmix_elf_section_data (sec)->pjs.stubs_size_sum
2660 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno];
2661
2662 pjsno++;
2663 }
2664
2665 continue;
2666 }
2667
930b4cb2
HPN		 2668 /* Get the value of the symbol referred to by the reloc. */
2669 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2670 {
2671 /* A local symbol. */
6cdc0ccc 2672 Elf_Internal_Sym *isym;
930b4cb2
HPN		 2673 asection *sym_sec;
2674
6cdc0ccc
AM		 2675 /* Read this BFD's local symbols if we haven't already. */
2676 if (isymbuf == NULL)
2677 {
2678 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2679 if (isymbuf == NULL)
2680 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2681 symtab_hdr->sh_info, 0,
2682 NULL, NULL, NULL);
2683 if (isymbuf == 0)
2684 goto error_return;
2685 }
930b4cb2 2686
6cdc0ccc
AM		 2687 isym = isymbuf + ELF64_R_SYM (irel->r_info);
2688 if (isym->st_shndx == SHN_UNDEF)
930b4cb2 2689 sym_sec = bfd_und_section_ptr;
6cdc0ccc 2690 else if (isym->st_shndx == SHN_ABS)
930b4cb2 2691 sym_sec = bfd_abs_section_ptr;
6cdc0ccc 2692 else if (isym->st_shndx == SHN_COMMON)
930b4cb2
HPN		 2693 sym_sec = bfd_com_section_ptr;
2694 else
6cdc0ccc
AM		 2695 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2696 symval = (isym->st_value
930b4cb2
HPN		 2697 + sym_sec->output_section->vma
2698 + sym_sec->output_offset);
2699 }
2700 else
2701 {
2702 unsigned long indx;
930b4cb2
HPN		 2703
2704 /* An external symbol. */
2705 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2706 h = elf_sym_hashes (abfd)[indx];
2707 BFD_ASSERT (h != NULL);
2708 if (h->root.type != bfd_link_hash_defined
2709 && h->root.type != bfd_link_hash_defweak)
2710 {
f60ebe14
HPN		 2711 /* This appears to be a reference to an undefined symbol. Just
2712 ignore it--it will be caught by the regular reloc processing.
2713 We need to keep BPO reloc accounting consistent, though
2714 else we'll abort instead of emitting an error message. */
2715 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET
2716 && gregdata != NULL)
2717 {
2718 gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
2719 bpono++;
2720 }
930b4cb2
HPN		 2721 continue;
2722 }
2723
2724 symval = (h->root.u.def.value
2725 + h->root.u.def.section->output_section->vma
2726 + h->root.u.def.section->output_offset);
2727 }
2728
f60ebe14
HPN		 2729 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE)
2730 {
2731 bfd_vma value = symval + irel->r_addend;
2732 bfd_vma dot
2733 = (sec->output_section->vma
2734 + sec->output_offset
2735 + irel->r_offset);
2736 bfd_vma stubaddr
2737 = (sec->output_section->vma
2738 + sec->output_offset
eea6121a 2739 + size
f60ebe14
HPN		 2740 + mmix_elf_section_data (sec)->pjs.stubs_size_sum);
2741
2742 if ((value & 3) == 0
2743 && bfd_check_overflow (complain_overflow_signed,
2744 19,
2745 0,
2746 bfd_arch_bits_per_address (abfd),
2747 value - dot
2748 - (value > dot
2749 ? mmix_elf_section_data (sec)
2750 ->pjs.stub_size[pjsno]
2751 : 0))
2752 == bfd_reloc_ok)
2753 /* If the reloc fits, no stub is needed. */
2754 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0;
2755 else
2756 /* Maybe we can get away with just a JMP insn? */
2757 if ((value & 3) == 0
2758 && bfd_check_overflow (complain_overflow_signed,
2759 27,
2760 0,
2761 bfd_arch_bits_per_address (abfd),
2762 value - stubaddr
2763 - (value > dot
2764 ? mmix_elf_section_data (sec)
2765 ->pjs.stub_size[pjsno] - 4
2766 : 0))
2767 == bfd_reloc_ok)
2768 /* Yep, account for a stub consisting of a single JMP insn. */
2769 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4;
2770 else
2771 /* Nope, go for the full insn stub. It doesn't seem useful to
2772 emit the intermediate sizes; those will only be useful for
2773 a >64M program assuming contiguous code. */
2774 mmix_elf_section_data (sec)->pjs.stub_size[pjsno]
2775 = MAX_PUSHJ_STUB_SIZE;
2776
2777 mmix_elf_section_data (sec)->pjs.stubs_size_sum
2778 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno];
2779 pjsno++;
2780 continue;
2781 }
2782
2783 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */
2784
930b4cb2
HPN		 2785 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value
2786 = symval + irel->r_addend;
b34976b6 2787 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE;
930b4cb2
HPN		 2788 gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
2789 }
2790
2791 /* Check if that was the last BPO-reloc. If so, sort the values and
2792 calculate how many registers we need to cover them. Set the size of
2793 the linker gregs, and if the number of registers changed, indicate
2794 that we need to relax some more because we have more work to do. */
f60ebe14
HPN		 2795 if (gregdata != NULL
2796 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0)
930b4cb2
HPN		 2797 {
2798 size_t i;
2799 bfd_vma prev_base;
2800 size_t regindex;
2801
2802 /* First, reset the remaining relocs for the next round. */
2803 gregdata->n_remaining_bpo_relocs_this_relaxation_round
2804 = gregdata->n_bpo_relocs;
2805
2c3fc389 2806 qsort (gregdata->reloc_request,
930b4cb2
HPN		 2807 gregdata->n_max_bpo_relocs,
2808 sizeof (struct bpo_reloc_request),
2809 bpo_reloc_request_sort_fn);
2810
2811 /* Recalculate indexes. When we find a change (however unlikely
2812 after the initial iteration), we know we need to relax again,
2813 since items in the GREG-array are sorted by increasing value and
2814 stored in the relaxation phase. */
2815 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2816 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
2817 != i)
2818 {
2819 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
2820 = i;
b34976b6 2821 *again = TRUE;
930b4cb2
HPN		 2822 }
2823
2824 /* Allocate register numbers (indexing from 0). Stop at the first
2825 non-valid reloc. */
2826 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value;
2827 i < gregdata->n_bpo_relocs;
2828 i++)
2829 {
2830 if (gregdata->reloc_request[i].value > prev_base + 255)
2831 {
2832 regindex++;
2833 prev_base = gregdata->reloc_request[i].value;
2834 }
2835 gregdata->reloc_request[i].regindex = regindex;
2836 gregdata->reloc_request[i].offset
2837 = gregdata->reloc_request[i].value - prev_base;
2838 }
2839
2840 /* If it's not the same as the last time, we need to relax again,
2841 because the size of the section has changed. I'm not sure we
2842 actually need to do any adjustments since the shrinking happens
2843 at the start of this section, but better safe than sorry. */
2844 if (gregdata->n_allocated_bpo_gregs != regindex + 1)
2845 {
2846 gregdata->n_allocated_bpo_gregs = regindex + 1;
b34976b6 2847 *again = TRUE;
930b4cb2
HPN		 2848 }
2849
eea6121a 2850 bpo_gregs_section->size = (regindex + 1) * 8;
930b4cb2
HPN		 2851 }
2852
6cdc0ccc 2853 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
930b4cb2
HPN		 2854 {
2855 if (! link_info->keep_memory)
6cdc0ccc
AM		 2856 free (isymbuf);
2857 else
930b4cb2 2858 {
6cdc0ccc
AM		 2859 /* Cache the symbols for elf_link_input_bfd. */
2860 symtab_hdr->contents = (unsigned char *) isymbuf;
930b4cb2
HPN		 2861 }
2862 }
2863
6cdc0ccc
AM		 2864 if (internal_relocs != NULL
2865 && elf_section_data (sec)->relocs != internal_relocs)
2866 free (internal_relocs);
2867
eea6121a 2868 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum)
f60ebe14
HPN		 2869 abort ();
2870
eea6121a 2871 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum)
f60ebe14 2872 {
eea6121a 2873 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum;
f60ebe14
HPN		 2874 *again = TRUE;
2875 }
2876
b34976b6 2877 return TRUE;
930b4cb2
HPN		 2878
2879 error_return:
6cdc0ccc
AM		 2880 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
2881 free (isymbuf);
2882 if (internal_relocs != NULL
2883 && elf_section_data (sec)->relocs != internal_relocs)
2884 free (internal_relocs);
b34976b6 2885 return FALSE;
930b4cb2
HPN		 2886}
2887\f
3c3bdf30
NC		 2888#define ELF_ARCH bfd_arch_mmix
2889#define ELF_MACHINE_CODE EM_MMIX
2890
2891/* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL).
2892 However, that's too much for something somewhere in the linker part of
2893 BFD; perhaps the start-address has to be a non-zero multiple of this
2894 number, or larger than this number. The symptom is that the linker
2895 complains: "warning: allocated section `.text' not in segment". We
2896 settle for 64k; the page-size used in examples is 8k.
2897 #define ELF_MAXPAGESIZE 0x10000
2898
2899 Unfortunately, this causes excessive padding in the supposedly small
2900 for-education programs that are the expected usage (where people would
2901 inspect output). We stick to 256 bytes just to have *some* default
2902 alignment. */
2903#define ELF_MAXPAGESIZE 0x100
2904
6d00b590 2905#define TARGET_BIG_SYM mmix_elf64_vec
3c3bdf30
NC		 2906#define TARGET_BIG_NAME "elf64-mmix"
2907
2908#define elf_info_to_howto_rel NULL
2909#define elf_info_to_howto mmix_info_to_howto_rela
2910#define elf_backend_relocate_section mmix_elf_relocate_section
2911#define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook
930b4cb2
HPN		 2912#define elf_backend_gc_sweep_hook mmix_elf_gc_sweep_hook
2913
3c3bdf30
NC		 2914#define elf_backend_link_output_symbol_hook \
2915 mmix_elf_link_output_symbol_hook
2916#define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook
2917
2918#define elf_backend_check_relocs mmix_elf_check_relocs
2919#define elf_backend_symbol_processing mmix_elf_symbol_processing
74541ad4
AM		 2920#define elf_backend_omit_section_dynsym \
2921 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
3c3bdf30
NC		 2922
2923#define bfd_elf64_bfd_is_local_label_name \
2924 mmix_elf_is_local_label_name
2925
2926#define elf_backend_may_use_rel_p 0
2927#define elf_backend_may_use_rela_p 1
2928#define elf_backend_default_use_rela_p 1
2929
2930#define elf_backend_can_gc_sections 1
2931#define elf_backend_section_from_bfd_section \
2932 mmix_elf_section_from_bfd_section
2933
f0abc2a1 2934#define bfd_elf64_new_section_hook mmix_elf_new_section_hook
3c3bdf30 2935#define bfd_elf64_bfd_final_link mmix_elf_final_link
930b4cb2 2936#define bfd_elf64_bfd_relax_section mmix_elf_relax_section
3c3bdf30
NC		 2937
2938#include "elf64-target.h"
GDB Binutils - Deliverables
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