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2005-06-20 H.J. Lu <hongjiu.lu@intel.com>
[deliverable/binutils-gdb.git] / bfd / elf64-mmix.c
CommitLineData
3c3bdf30 1/* MMIX-specific support for 64-bit ELF.
f075ee0c 2 Copyright 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
3c3bdf30
NC		 3 Contributed by Hans-Peter Nilsson <hp@bitrange.com>
4
5This file is part of BFD, the Binary File Descriptor library.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
3e110533 19Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
3c3bdf30
NC		 20
21/* No specific ABI or "processor-specific supplement" defined. */
22
23/* TODO:
f60ebe14
HPN		 24 - "Traditional" linker relaxation (shrinking whole sections).
25 - Merge reloc stubs jumping to same location.
26 - GETA stub relaxation (call a stub for out of range new
27 R_MMIX_GETA_STUBBABLE). */
3c3bdf30
NC		 28
29#include "bfd.h"
30#include "sysdep.h"
31#include "libbfd.h"
32#include "elf-bfd.h"
33#include "elf/mmix.h"
34#include "opcode/mmix.h"
35
36#define MINUS_ONE (((bfd_vma) 0) - 1)
37
f60ebe14
HPN		 38#define MAX_PUSHJ_STUB_SIZE (5 * 4)
39
3c3bdf30
NC		 40/* Put these everywhere in new code. */
41#define FATAL_DEBUG \
42 _bfd_abort (__FILE__, __LINE__, \
43 "Internal: Non-debugged code (test-case missing)")
44
45#define BAD_CASE(x) \
46 _bfd_abort (__FILE__, __LINE__, \
47 "bad case for " #x)
48
f0abc2a1
AM		 49struct _mmix_elf_section_data
50{
51 struct bfd_elf_section_data elf;
52 union
53 {
54 struct bpo_reloc_section_info *reloc;
55 struct bpo_greg_section_info *greg;
56 } bpo;
f60ebe14
HPN		 57
58 struct pushj_stub_info
59 {
60 /* Maximum number of stubs needed for this section. */
61 bfd_size_type n_pushj_relocs;
62
63 /* Size of stubs after a mmix_elf_relax_section round. */
64 bfd_size_type stubs_size_sum;
65
66 /* Per-reloc stubs_size_sum information. The stubs_size_sum member is the sum
67 of these. Allocated in mmix_elf_check_common_relocs. */
68 bfd_size_type *stub_size;
69
70 /* Offset of next stub during relocation. Somewhat redundant with the
71 above: error coverage is easier and we don't have to reset the
72 stubs_size_sum for relocation. */
73 bfd_size_type stub_offset;
74 } pjs;
f0abc2a1
AM		 75};
76
77#define mmix_elf_section_data(sec) \
68bfbfcc 78 ((struct _mmix_elf_section_data *) elf_section_data (sec))
f0abc2a1 79
930b4cb2 80/* For each section containing a base-plus-offset (BPO) reloc, we attach
f0abc2a1 81 this struct as mmix_elf_section_data (section)->bpo, which is otherwise
930b4cb2
HPN		 82 NULL. */
83struct bpo_reloc_section_info
84 {
85 /* The base is 1; this is the first number in this section. */
86 size_t first_base_plus_offset_reloc;
87
88 /* Number of BPO-relocs in this section. */
89 size_t n_bpo_relocs_this_section;
90
91 /* Running index, used at relocation time. */
92 size_t bpo_index;
93
94 /* We don't have access to the bfd_link_info struct in
95 mmix_final_link_relocate. What we really want to get at is the
96 global single struct greg_relocation, so we stash it here. */
97 asection *bpo_greg_section;
98 };
99
100/* Helper struct (in global context) for the one below.
101 There's one of these created for every BPO reloc. */
102struct bpo_reloc_request
103 {
104 bfd_vma value;
105
106 /* Valid after relaxation. The base is 0; the first register number
107 must be added. The offset is in range 0..255. */
108 size_t regindex;
109 size_t offset;
110
111 /* The order number for this BPO reloc, corresponding to the order in
112 which BPO relocs were found. Used to create an index after reloc
113 requests are sorted. */
114 size_t bpo_reloc_no;
115
116 /* Set when the value is computed. Better than coding "guard values"
b34976b6 117 into the other members. Is FALSE only for BPO relocs in a GC:ed
930b4cb2 118 section. */
b34976b6 119 bfd_boolean valid;
930b4cb2
HPN		 120 };
121
f0abc2a1 122/* We attach this as mmix_elf_section_data (sec)->bpo in the linker-allocated
930b4cb2
HPN		 123 greg contents section (MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME),
124 which is linked into the register contents section
125 (MMIX_REG_CONTENTS_SECTION_NAME). This section is created by the
126 linker; using the same hook as for usual with BPO relocs does not
127 collide. */
128struct bpo_greg_section_info
129 {
130 /* After GC, this reflects the number of remaining, non-excluded
131 BPO-relocs. */
132 size_t n_bpo_relocs;
133
134 /* This is the number of allocated bpo_reloc_requests; the size of
135 sorted_indexes. Valid after the check.*relocs functions are called
136 for all incoming sections. It includes the number of BPO relocs in
137 sections that were GC:ed. */
138 size_t n_max_bpo_relocs;
139
140 /* A counter used to find out when to fold the BPO gregs, since we
141 don't have a single "after-relaxation" hook. */
142 size_t n_remaining_bpo_relocs_this_relaxation_round;
143
144 /* The number of linker-allocated GREGs resulting from BPO relocs.
f60ebe14
HPN		 145 This is an approximation after _bfd_mmix_before_linker_allocation
146 and supposedly accurate after mmix_elf_relax_section is called for
147 all incoming non-collected sections. */
930b4cb2
HPN		 148 size_t n_allocated_bpo_gregs;
149
150 /* Index into reloc_request[], sorted on increasing "value", secondary
151 by increasing index for strict sorting order. */
152 size_t *bpo_reloc_indexes;
153
154 /* An array of all relocations, with the "value" member filled in by
155 the relaxation function. */
156 struct bpo_reloc_request *reloc_request;
157 };
158
b34976b6 159static bfd_boolean mmix_elf_link_output_symbol_hook
754021d0
AM		 160 PARAMS ((struct bfd_link_info *, const char *, Elf_Internal_Sym *,
161 asection *, struct elf_link_hash_entry *));
3c3bdf30
NC		 162
163static bfd_reloc_status_type mmix_elf_reloc
164 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
165
166static reloc_howto_type *bfd_elf64_bfd_reloc_type_lookup
167 PARAMS ((bfd *, bfd_reloc_code_real_type));
168
169static void mmix_info_to_howto_rela
947216bf 170 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
3c3bdf30
NC		 171
172static int mmix_elf_sort_relocs PARAMS ((const PTR, const PTR));
173
f0abc2a1
AM		 174static bfd_boolean mmix_elf_new_section_hook
175 PARAMS ((bfd *, asection *));
176
b34976b6 177static bfd_boolean mmix_elf_check_relocs
3c3bdf30
NC		 178 PARAMS ((bfd *, struct bfd_link_info *, asection *,
179 const Elf_Internal_Rela *));
180
b34976b6 181static bfd_boolean mmix_elf_check_common_relocs
930b4cb2
HPN		 182 PARAMS ((bfd *, struct bfd_link_info *, asection *,
183 const Elf_Internal_Rela *));
184
b34976b6 185static bfd_boolean mmix_elf_relocate_section
3c3bdf30
NC		 186 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
187 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
188
189static asection * mmix_elf_gc_mark_hook
1e2f5b6e 190 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
3c3bdf30
NC		 191 struct elf_link_hash_entry *, Elf_Internal_Sym *));
192
b34976b6 193static bfd_boolean mmix_elf_gc_sweep_hook
930b4cb2
HPN		 194 PARAMS ((bfd *, struct bfd_link_info *, asection *,
195 const Elf_Internal_Rela *));
196
3c3bdf30
NC		 197static bfd_reloc_status_type mmix_final_link_relocate
198 PARAMS ((reloc_howto_type *, asection *, bfd_byte *,
199 bfd_vma, bfd_signed_vma, bfd_vma, const char *, asection *));
200
201static bfd_reloc_status_type mmix_elf_perform_relocation
202 PARAMS ((asection *, reloc_howto_type *, PTR, bfd_vma, bfd_vma));
203
b34976b6 204static bfd_boolean mmix_elf_section_from_bfd_section
af746e92 205 PARAMS ((bfd *, asection *, int *));
3c3bdf30 206
b34976b6 207static bfd_boolean mmix_elf_add_symbol_hook
555cd476 208 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Sym *,
3c3bdf30
NC		 209 const char **, flagword *, asection **, bfd_vma *));
210
b34976b6 211static bfd_boolean mmix_elf_is_local_label_name
3c3bdf30
NC		 212 PARAMS ((bfd *, const char *));
213
930b4cb2
HPN		 214static int bpo_reloc_request_sort_fn PARAMS ((const PTR, const PTR));
215
b34976b6 216static bfd_boolean mmix_elf_relax_section
930b4cb2 217 PARAMS ((bfd *abfd, asection *sec, struct bfd_link_info *link_info,
b34976b6 218 bfd_boolean *again));
930b4cb2 219
b34976b6 220extern bfd_boolean mmix_elf_final_link PARAMS ((bfd *, struct bfd_link_info *));
3c3bdf30
NC		 221
222extern void mmix_elf_symbol_processing PARAMS ((bfd *, asymbol *));
223
4fa5c2a8
HPN		 224/* Only intended to be called from a debugger. */
225extern void mmix_dump_bpo_gregs
226 PARAMS ((struct bfd_link_info *, bfd_error_handler_type));
227
f60ebe14
HPN		 228static void
229mmix_set_relaxable_size
230 PARAMS ((bfd *, asection *, void *));
231
f60ebe14 232
3c3bdf30
NC		 233/* Watch out: this currently needs to have elements with the same index as
234 their R_MMIX_ number. */
235static reloc_howto_type elf_mmix_howto_table[] =
236 {
237 /* This reloc does nothing. */
238 HOWTO (R_MMIX_NONE, /* type */
239 0, /* rightshift */
240 2, /* size (0 = byte, 1 = short, 2 = long) */
241 32, /* 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_NONE", /* name */
b34976b6 247 FALSE, /* partial_inplace */
3c3bdf30
NC		 248 0, /* src_mask */
249 0, /* dst_mask */
b34976b6 250 FALSE), /* pcrel_offset */
3c3bdf30
NC		 251
252 /* An 8 bit absolute relocation. */
253 HOWTO (R_MMIX_8, /* type */
254 0, /* rightshift */
255 0, /* size (0 = byte, 1 = short, 2 = long) */
256 8, /* 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_8", /* name */
b34976b6 262 FALSE, /* partial_inplace */
930b4cb2 263 0, /* src_mask */
3c3bdf30 264 0xff, /* dst_mask */
b34976b6 265 FALSE), /* pcrel_offset */
3c3bdf30
NC		 266
267 /* An 16 bit absolute relocation. */
268 HOWTO (R_MMIX_16, /* type */
269 0, /* rightshift */
270 1, /* size (0 = byte, 1 = short, 2 = long) */
271 16, /* 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_16", /* name */
b34976b6 277 FALSE, /* partial_inplace */
930b4cb2 278 0, /* src_mask */
3c3bdf30 279 0xffff, /* dst_mask */
b34976b6 280 FALSE), /* pcrel_offset */
3c3bdf30
NC		 281
282 /* An 24 bit absolute relocation. */
283 HOWTO (R_MMIX_24, /* type */
284 0, /* rightshift */
285 2, /* size (0 = byte, 1 = short, 2 = long) */
286 24, /* bitsize */
b34976b6 287 FALSE, /* pc_relative */
3c3bdf30
NC		 288 0, /* bitpos */
289 complain_overflow_bitfield, /* complain_on_overflow */
290 bfd_elf_generic_reloc, /* special_function */
291 "R_MMIX_24", /* name */
b34976b6 292 FALSE, /* partial_inplace */
930b4cb2 293 ~0xffffff, /* src_mask */
3c3bdf30 294 0xffffff, /* dst_mask */
b34976b6 295 FALSE), /* pcrel_offset */
3c3bdf30
NC		 296
297 /* A 32 bit absolute relocation. */
298 HOWTO (R_MMIX_32, /* type */
299 0, /* rightshift */
300 2, /* size (0 = byte, 1 = short, 2 = long) */
301 32, /* bitsize */
b34976b6 302 FALSE, /* pc_relative */
3c3bdf30
NC		 303 0, /* bitpos */
304 complain_overflow_bitfield, /* complain_on_overflow */
305 bfd_elf_generic_reloc, /* special_function */
306 "R_MMIX_32", /* name */
b34976b6 307 FALSE, /* partial_inplace */
930b4cb2 308 0, /* src_mask */
3c3bdf30 309 0xffffffff, /* dst_mask */
b34976b6 310 FALSE), /* pcrel_offset */
3c3bdf30
NC		 311
312 /* 64 bit relocation. */
313 HOWTO (R_MMIX_64, /* type */
314 0, /* rightshift */
315 4, /* size (0 = byte, 1 = short, 2 = long) */
316 64, /* bitsize */
b34976b6 317 FALSE, /* pc_relative */
3c3bdf30
NC		 318 0, /* bitpos */
319 complain_overflow_bitfield, /* complain_on_overflow */
320 bfd_elf_generic_reloc, /* special_function */
321 "R_MMIX_64", /* name */
b34976b6 322 FALSE, /* partial_inplace */
930b4cb2 323 0, /* src_mask */
3c3bdf30 324 MINUS_ONE, /* dst_mask */
b34976b6 325 FALSE), /* pcrel_offset */
3c3bdf30
NC		 326
327 /* An 8 bit PC-relative relocation. */
328 HOWTO (R_MMIX_PC_8, /* type */
329 0, /* rightshift */
330 0, /* size (0 = byte, 1 = short, 2 = long) */
331 8, /* 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_8", /* name */
b34976b6 337 FALSE, /* partial_inplace */
930b4cb2 338 0, /* src_mask */
3c3bdf30 339 0xff, /* dst_mask */
b34976b6 340 TRUE), /* pcrel_offset */
3c3bdf30
NC		 341
342 /* An 16 bit PC-relative relocation. */
343 HOWTO (R_MMIX_PC_16, /* type */
344 0, /* rightshift */
345 1, /* size (0 = byte, 1 = short, 2 = long) */
346 16, /* 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_16", /* name */
b34976b6 352 FALSE, /* partial_inplace */
930b4cb2 353 0, /* src_mask */
3c3bdf30 354 0xffff, /* dst_mask */
b34976b6 355 TRUE), /* pcrel_offset */
3c3bdf30
NC		 356
357 /* An 24 bit PC-relative relocation. */
358 HOWTO (R_MMIX_PC_24, /* type */
359 0, /* rightshift */
360 2, /* size (0 = byte, 1 = short, 2 = long) */
361 24, /* bitsize */
b34976b6 362 TRUE, /* pc_relative */
3c3bdf30
NC		 363 0, /* bitpos */
364 complain_overflow_bitfield, /* complain_on_overflow */
365 bfd_elf_generic_reloc, /* special_function */
366 "R_MMIX_PC_24", /* name */
b34976b6 367 FALSE, /* partial_inplace */
930b4cb2 368 ~0xffffff, /* src_mask */
3c3bdf30 369 0xffffff, /* dst_mask */
b34976b6 370 TRUE), /* pcrel_offset */
3c3bdf30
NC		 371
372 /* A 32 bit absolute PC-relative relocation. */
373 HOWTO (R_MMIX_PC_32, /* type */
374 0, /* rightshift */
375 2, /* size (0 = byte, 1 = short, 2 = long) */
376 32, /* bitsize */
b34976b6 377 TRUE, /* pc_relative */
3c3bdf30
NC		 378 0, /* bitpos */
379 complain_overflow_bitfield, /* complain_on_overflow */
380 bfd_elf_generic_reloc, /* special_function */
381 "R_MMIX_PC_32", /* name */
b34976b6 382 FALSE, /* partial_inplace */
930b4cb2 383 0, /* src_mask */
3c3bdf30 384 0xffffffff, /* dst_mask */
b34976b6 385 TRUE), /* pcrel_offset */
3c3bdf30
NC		 386
387 /* 64 bit PC-relative relocation. */
388 HOWTO (R_MMIX_PC_64, /* type */
389 0, /* rightshift */
390 4, /* size (0 = byte, 1 = short, 2 = long) */
391 64, /* bitsize */
b34976b6 392 TRUE, /* pc_relative */
3c3bdf30
NC		 393 0, /* bitpos */
394 complain_overflow_bitfield, /* complain_on_overflow */
395 bfd_elf_generic_reloc, /* special_function */
396 "R_MMIX_PC_64", /* name */
b34976b6 397 FALSE, /* partial_inplace */
930b4cb2 398 0, /* src_mask */
3c3bdf30 399 MINUS_ONE, /* dst_mask */
b34976b6 400 TRUE), /* pcrel_offset */
3c3bdf30
NC		 401
402 /* GNU extension to record C++ vtable hierarchy. */
403 HOWTO (R_MMIX_GNU_VTINHERIT, /* type */
404 0, /* rightshift */
405 0, /* size (0 = byte, 1 = short, 2 = long) */
406 0, /* bitsize */
b34976b6 407 FALSE, /* pc_relative */
3c3bdf30
NC		 408 0, /* bitpos */
409 complain_overflow_dont, /* complain_on_overflow */
410 NULL, /* special_function */
411 "R_MMIX_GNU_VTINHERIT", /* name */
b34976b6 412 FALSE, /* partial_inplace */
3c3bdf30
NC		 413 0, /* src_mask */
414 0, /* dst_mask */
b34976b6 415 TRUE), /* pcrel_offset */
3c3bdf30
NC		 416
417 /* GNU extension to record C++ vtable member usage. */
418 HOWTO (R_MMIX_GNU_VTENTRY, /* type */
419 0, /* rightshift */
420 0, /* size (0 = byte, 1 = short, 2 = long) */
421 0, /* bitsize */
b34976b6 422 FALSE, /* pc_relative */
3c3bdf30
NC		 423 0, /* bitpos */
424 complain_overflow_dont, /* complain_on_overflow */
425 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
426 "R_MMIX_GNU_VTENTRY", /* name */
b34976b6 427 FALSE, /* partial_inplace */
3c3bdf30
NC		 428 0, /* src_mask */
429 0, /* dst_mask */
b34976b6 430 FALSE), /* pcrel_offset */
3c3bdf30
NC		 431
432 /* The GETA relocation is supposed to get any address that could
433 possibly be reached by the GETA instruction. It can silently expand
434 to get a 64-bit operand, but will complain if any of the two least
435 significant bits are set. The howto members reflect a simple GETA. */
436 HOWTO (R_MMIX_GETA, /* type */
437 2, /* rightshift */
438 2, /* size (0 = byte, 1 = short, 2 = long) */
439 19, /* bitsize */
b34976b6 440 TRUE, /* pc_relative */
3c3bdf30
NC		 441 0, /* bitpos */
442 complain_overflow_signed, /* complain_on_overflow */
443 mmix_elf_reloc, /* special_function */
444 "R_MMIX_GETA", /* name */
b34976b6 445 FALSE, /* partial_inplace */
930b4cb2 446 ~0x0100ffff, /* src_mask */
3c3bdf30 447 0x0100ffff, /* dst_mask */
b34976b6 448 TRUE), /* pcrel_offset */
3c3bdf30
NC		 449
450 HOWTO (R_MMIX_GETA_1, /* type */
451 2, /* rightshift */
452 2, /* size (0 = byte, 1 = short, 2 = long) */
453 19, /* bitsize */
b34976b6 454 TRUE, /* pc_relative */
3c3bdf30
NC		 455 0, /* bitpos */
456 complain_overflow_signed, /* complain_on_overflow */
457 mmix_elf_reloc, /* special_function */
458 "R_MMIX_GETA_1", /* name */
b34976b6 459 FALSE, /* partial_inplace */
930b4cb2 460 ~0x0100ffff, /* src_mask */
3c3bdf30 461 0x0100ffff, /* dst_mask */
b34976b6 462 TRUE), /* pcrel_offset */
3c3bdf30
NC		 463
464 HOWTO (R_MMIX_GETA_2, /* type */
465 2, /* rightshift */
466 2, /* size (0 = byte, 1 = short, 2 = long) */
467 19, /* bitsize */
b34976b6 468 TRUE, /* pc_relative */
3c3bdf30
NC		 469 0, /* bitpos */
470 complain_overflow_signed, /* complain_on_overflow */
471 mmix_elf_reloc, /* special_function */
472 "R_MMIX_GETA_2", /* name */
b34976b6 473 FALSE, /* partial_inplace */
930b4cb2 474 ~0x0100ffff, /* src_mask */
3c3bdf30 475 0x0100ffff, /* dst_mask */
b34976b6 476 TRUE), /* pcrel_offset */
3c3bdf30
NC		 477
478 HOWTO (R_MMIX_GETA_3, /* type */
479 2, /* rightshift */
480 2, /* size (0 = byte, 1 = short, 2 = long) */
481 19, /* bitsize */
b34976b6 482 TRUE, /* pc_relative */
3c3bdf30
NC		 483 0, /* bitpos */
484 complain_overflow_signed, /* complain_on_overflow */
485 mmix_elf_reloc, /* special_function */
486 "R_MMIX_GETA_3", /* name */
b34976b6 487 FALSE, /* partial_inplace */
930b4cb2 488 ~0x0100ffff, /* src_mask */
3c3bdf30 489 0x0100ffff, /* dst_mask */
b34976b6 490 TRUE), /* pcrel_offset */
3c3bdf30
NC		 491
492 /* The conditional branches are supposed to reach any (code) address.
493 It can silently expand to a 64-bit operand, but will emit an error if
494 any of the two least significant bits are set. The howto members
495 reflect a simple branch. */
496 HOWTO (R_MMIX_CBRANCH, /* type */
497 2, /* rightshift */
498 2, /* size (0 = byte, 1 = short, 2 = long) */
499 19, /* bitsize */
b34976b6 500 TRUE, /* pc_relative */
3c3bdf30
NC		 501 0, /* bitpos */
502 complain_overflow_signed, /* complain_on_overflow */
503 mmix_elf_reloc, /* special_function */
504 "R_MMIX_CBRANCH", /* name */
b34976b6 505 FALSE, /* partial_inplace */
930b4cb2 506 ~0x0100ffff, /* src_mask */
3c3bdf30 507 0x0100ffff, /* dst_mask */
b34976b6 508 TRUE), /* pcrel_offset */
3c3bdf30
NC		 509
510 HOWTO (R_MMIX_CBRANCH_J, /* type */
511 2, /* rightshift */
512 2, /* size (0 = byte, 1 = short, 2 = long) */
513 19, /* bitsize */
b34976b6 514 TRUE, /* pc_relative */
3c3bdf30
NC		 515 0, /* bitpos */
516 complain_overflow_signed, /* complain_on_overflow */
517 mmix_elf_reloc, /* special_function */
518 "R_MMIX_CBRANCH_J", /* name */
b34976b6 519 FALSE, /* partial_inplace */
930b4cb2 520 ~0x0100ffff, /* src_mask */
3c3bdf30 521 0x0100ffff, /* dst_mask */
b34976b6 522 TRUE), /* pcrel_offset */
3c3bdf30
NC		 523
524 HOWTO (R_MMIX_CBRANCH_1, /* type */
525 2, /* rightshift */
526 2, /* size (0 = byte, 1 = short, 2 = long) */
527 19, /* bitsize */
b34976b6 528 TRUE, /* pc_relative */
3c3bdf30
NC		 529 0, /* bitpos */
530 complain_overflow_signed, /* complain_on_overflow */
531 mmix_elf_reloc, /* special_function */
532 "R_MMIX_CBRANCH_1", /* name */
b34976b6 533 FALSE, /* partial_inplace */
930b4cb2 534 ~0x0100ffff, /* src_mask */
3c3bdf30 535 0x0100ffff, /* dst_mask */
b34976b6 536 TRUE), /* pcrel_offset */
3c3bdf30
NC		 537
538 HOWTO (R_MMIX_CBRANCH_2, /* type */
539 2, /* rightshift */
540 2, /* size (0 = byte, 1 = short, 2 = long) */
541 19, /* bitsize */
b34976b6 542 TRUE, /* pc_relative */
3c3bdf30
NC		 543 0, /* bitpos */
544 complain_overflow_signed, /* complain_on_overflow */
545 mmix_elf_reloc, /* special_function */
546 "R_MMIX_CBRANCH_2", /* name */
b34976b6 547 FALSE, /* partial_inplace */
930b4cb2 548 ~0x0100ffff, /* src_mask */
3c3bdf30 549 0x0100ffff, /* dst_mask */
b34976b6 550 TRUE), /* pcrel_offset */
3c3bdf30
NC		 551
552 HOWTO (R_MMIX_CBRANCH_3, /* type */
553 2, /* rightshift */
554 2, /* size (0 = byte, 1 = short, 2 = long) */
555 19, /* bitsize */
b34976b6 556 TRUE, /* pc_relative */
3c3bdf30
NC		 557 0, /* bitpos */
558 complain_overflow_signed, /* complain_on_overflow */
559 mmix_elf_reloc, /* special_function */
560 "R_MMIX_CBRANCH_3", /* name */
b34976b6 561 FALSE, /* partial_inplace */
930b4cb2 562 ~0x0100ffff, /* src_mask */
3c3bdf30 563 0x0100ffff, /* dst_mask */
b34976b6 564 TRUE), /* pcrel_offset */
3c3bdf30
NC		 565
566 /* The PUSHJ instruction can reach any (code) address, as long as it's
567 the beginning of a function (no usable restriction). It can silently
568 expand to a 64-bit operand, but will emit an error if any of the two
f60ebe14
HPN		 569 least significant bits are set. It can also expand into a call to a
570 stub; see R_MMIX_PUSHJ_STUBBABLE. The howto members reflect a simple
3c3bdf30
NC		 571 PUSHJ. */
572 HOWTO (R_MMIX_PUSHJ, /* type */
573 2, /* rightshift */
574 2, /* size (0 = byte, 1 = short, 2 = long) */
575 19, /* bitsize */
b34976b6 576 TRUE, /* pc_relative */
3c3bdf30
NC		 577 0, /* bitpos */
578 complain_overflow_signed, /* complain_on_overflow */
579 mmix_elf_reloc, /* special_function */
580 "R_MMIX_PUSHJ", /* name */
b34976b6 581 FALSE, /* partial_inplace */
930b4cb2 582 ~0x0100ffff, /* src_mask */
3c3bdf30 583 0x0100ffff, /* dst_mask */
b34976b6 584 TRUE), /* pcrel_offset */
3c3bdf30
NC		 585
586 HOWTO (R_MMIX_PUSHJ_1, /* type */
587 2, /* rightshift */
588 2, /* size (0 = byte, 1 = short, 2 = long) */
589 19, /* bitsize */
b34976b6 590 TRUE, /* pc_relative */
3c3bdf30
NC		 591 0, /* bitpos */
592 complain_overflow_signed, /* complain_on_overflow */
593 mmix_elf_reloc, /* special_function */
594 "R_MMIX_PUSHJ_1", /* name */
b34976b6 595 FALSE, /* partial_inplace */
930b4cb2 596 ~0x0100ffff, /* src_mask */
3c3bdf30 597 0x0100ffff, /* dst_mask */
b34976b6 598 TRUE), /* pcrel_offset */
3c3bdf30
NC		 599
600 HOWTO (R_MMIX_PUSHJ_2, /* type */
601 2, /* rightshift */
602 2, /* size (0 = byte, 1 = short, 2 = long) */
603 19, /* bitsize */
b34976b6 604 TRUE, /* pc_relative */
3c3bdf30
NC		 605 0, /* bitpos */
606 complain_overflow_signed, /* complain_on_overflow */
607 mmix_elf_reloc, /* special_function */
608 "R_MMIX_PUSHJ_2", /* name */
b34976b6 609 FALSE, /* partial_inplace */
930b4cb2 610 ~0x0100ffff, /* src_mask */
3c3bdf30 611 0x0100ffff, /* dst_mask */
b34976b6 612 TRUE), /* pcrel_offset */
3c3bdf30
NC		 613
614 HOWTO (R_MMIX_PUSHJ_3, /* type */
615 2, /* rightshift */
616 2, /* size (0 = byte, 1 = short, 2 = long) */
617 19, /* bitsize */
b34976b6 618 TRUE, /* pc_relative */
3c3bdf30
NC		 619 0, /* bitpos */
620 complain_overflow_signed, /* complain_on_overflow */
621 mmix_elf_reloc, /* special_function */
622 "R_MMIX_PUSHJ_3", /* name */
b34976b6 623 FALSE, /* partial_inplace */
930b4cb2 624 ~0x0100ffff, /* src_mask */
3c3bdf30 625 0x0100ffff, /* dst_mask */
b34976b6 626 TRUE), /* pcrel_offset */
3c3bdf30
NC		 627
628 /* A JMP is supposed to reach any (code) address. By itself, it can
629 reach +-64M; the expansion can reach all 64 bits. Note that the 64M
630 limit is soon reached if you link the program in wildly different
631 memory segments. The howto members reflect a trivial JMP. */
632 HOWTO (R_MMIX_JMP, /* type */
633 2, /* rightshift */
634 2, /* size (0 = byte, 1 = short, 2 = long) */
635 27, /* bitsize */
b34976b6 636 TRUE, /* pc_relative */
3c3bdf30
NC		 637 0, /* bitpos */
638 complain_overflow_signed, /* complain_on_overflow */
639 mmix_elf_reloc, /* special_function */
640 "R_MMIX_JMP", /* name */
b34976b6 641 FALSE, /* partial_inplace */
930b4cb2 642 ~0x1ffffff, /* src_mask */
3c3bdf30 643 0x1ffffff, /* dst_mask */
b34976b6 644 TRUE), /* pcrel_offset */
3c3bdf30
NC		 645
646 HOWTO (R_MMIX_JMP_1, /* type */
647 2, /* rightshift */
648 2, /* size (0 = byte, 1 = short, 2 = long) */
649 27, /* 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_JMP_1", /* name */
b34976b6 655 FALSE, /* partial_inplace */
930b4cb2 656 ~0x1ffffff, /* src_mask */
3c3bdf30 657 0x1ffffff, /* dst_mask */
b34976b6 658 TRUE), /* pcrel_offset */
3c3bdf30
NC		 659
660 HOWTO (R_MMIX_JMP_2, /* type */
661 2, /* rightshift */
662 2, /* size (0 = byte, 1 = short, 2 = long) */
663 27, /* bitsize */
b34976b6 664 TRUE, /* pc_relative */
3c3bdf30
NC		 665 0, /* bitpos */
666 complain_overflow_signed, /* complain_on_overflow */
667 mmix_elf_reloc, /* special_function */
668 "R_MMIX_JMP_2", /* name */
b34976b6 669 FALSE, /* partial_inplace */
930b4cb2 670 ~0x1ffffff, /* src_mask */
3c3bdf30 671 0x1ffffff, /* dst_mask */
b34976b6 672 TRUE), /* pcrel_offset */
3c3bdf30
NC		 673
674 HOWTO (R_MMIX_JMP_3, /* type */
675 2, /* rightshift */
676 2, /* size (0 = byte, 1 = short, 2 = long) */
677 27, /* bitsize */
b34976b6 678 TRUE, /* pc_relative */
3c3bdf30
NC		 679 0, /* bitpos */
680 complain_overflow_signed, /* complain_on_overflow */
681 mmix_elf_reloc, /* special_function */
682 "R_MMIX_JMP_3", /* name */
b34976b6 683 FALSE, /* partial_inplace */
930b4cb2 684 ~0x1ffffff, /* src_mask */
3c3bdf30 685 0x1ffffff, /* dst_mask */
b34976b6 686 TRUE), /* pcrel_offset */
3c3bdf30
NC		 687
688 /* When we don't emit link-time-relaxable code from the assembler, or
689 when relaxation has done all it can do, these relocs are used. For
690 GETA/PUSHJ/branches. */
691 HOWTO (R_MMIX_ADDR19, /* type */
692 2, /* rightshift */
693 2, /* size (0 = byte, 1 = short, 2 = long) */
694 19, /* bitsize */
b34976b6 695 TRUE, /* pc_relative */
3c3bdf30
NC		 696 0, /* bitpos */
697 complain_overflow_signed, /* complain_on_overflow */
698 mmix_elf_reloc, /* special_function */
699 "R_MMIX_ADDR19", /* name */
b34976b6 700 FALSE, /* partial_inplace */
930b4cb2 701 ~0x0100ffff, /* src_mask */
3c3bdf30 702 0x0100ffff, /* dst_mask */
b34976b6 703 TRUE), /* pcrel_offset */
3c3bdf30
NC		 704
705 /* For JMP. */
706 HOWTO (R_MMIX_ADDR27, /* type */
707 2, /* rightshift */
708 2, /* size (0 = byte, 1 = short, 2 = long) */
709 27, /* bitsize */
b34976b6 710 TRUE, /* pc_relative */
3c3bdf30
NC		 711 0, /* bitpos */
712 complain_overflow_signed, /* complain_on_overflow */
713 mmix_elf_reloc, /* special_function */
714 "R_MMIX_ADDR27", /* name */
b34976b6 715 FALSE, /* partial_inplace */
930b4cb2 716 ~0x1ffffff, /* src_mask */
3c3bdf30 717 0x1ffffff, /* dst_mask */
b34976b6 718 TRUE), /* pcrel_offset */
3c3bdf30
NC		 719
720 /* A general register or the value 0..255. If a value, then the
721 instruction (offset -3) needs adjusting. */
722 HOWTO (R_MMIX_REG_OR_BYTE, /* type */
723 0, /* rightshift */
724 1, /* size (0 = byte, 1 = short, 2 = long) */
725 8, /* bitsize */
b34976b6 726 FALSE, /* pc_relative */
3c3bdf30
NC		 727 0, /* bitpos */
728 complain_overflow_bitfield, /* complain_on_overflow */
729 mmix_elf_reloc, /* special_function */
730 "R_MMIX_REG_OR_BYTE", /* name */
b34976b6 731 FALSE, /* partial_inplace */
930b4cb2 732 0, /* src_mask */
3c3bdf30 733 0xff, /* dst_mask */
b34976b6 734 FALSE), /* pcrel_offset */
3c3bdf30
NC		 735
736 /* A general register. */
737 HOWTO (R_MMIX_REG, /* type */
738 0, /* rightshift */
739 1, /* size (0 = byte, 1 = short, 2 = long) */
740 8, /* bitsize */
b34976b6 741 FALSE, /* pc_relative */
3c3bdf30
NC		 742 0, /* bitpos */
743 complain_overflow_bitfield, /* complain_on_overflow */
744 mmix_elf_reloc, /* special_function */
745 "R_MMIX_REG", /* name */
b34976b6 746 FALSE, /* partial_inplace */
930b4cb2 747 0, /* src_mask */
3c3bdf30 748 0xff, /* dst_mask */
b34976b6 749 FALSE), /* pcrel_offset */
3c3bdf30
NC		 750
751 /* A register plus an index, corresponding to the relocation expression.
752 The sizes must correspond to the valid range of the expression, while
753 the bitmasks correspond to what we store in the image. */
754 HOWTO (R_MMIX_BASE_PLUS_OFFSET, /* type */
755 0, /* rightshift */
756 4, /* size (0 = byte, 1 = short, 2 = long) */
757 64, /* bitsize */
b34976b6 758 FALSE, /* pc_relative */
3c3bdf30
NC		 759 0, /* bitpos */
760 complain_overflow_bitfield, /* complain_on_overflow */
761 mmix_elf_reloc, /* special_function */
762 "R_MMIX_BASE_PLUS_OFFSET", /* name */
b34976b6 763 FALSE, /* partial_inplace */
930b4cb2 764 0, /* src_mask */
3c3bdf30 765 0xffff, /* dst_mask */
b34976b6 766 FALSE), /* pcrel_offset */
3c3bdf30
NC		 767
768 /* A "magic" relocation for a LOCAL expression, asserting that the
769 expression is less than the number of global registers. No actual
770 modification of the contents is done. Implementing this as a
771 relocation was less intrusive than e.g. putting such expressions in a
772 section to discard *after* relocation. */
773 HOWTO (R_MMIX_LOCAL, /* type */
774 0, /* rightshift */
775 0, /* size (0 = byte, 1 = short, 2 = long) */
776 0, /* bitsize */
b34976b6 777 FALSE, /* pc_relative */
3c3bdf30
NC		 778 0, /* bitpos */
779 complain_overflow_dont, /* complain_on_overflow */
780 mmix_elf_reloc, /* special_function */
781 "R_MMIX_LOCAL", /* name */
b34976b6 782 FALSE, /* partial_inplace */
3c3bdf30
NC		 783 0, /* src_mask */
784 0, /* dst_mask */
b34976b6 785 FALSE), /* pcrel_offset */
f60ebe14
HPN		 786
787 HOWTO (R_MMIX_PUSHJ_STUBBABLE, /* type */
788 2, /* rightshift */
789 2, /* size (0 = byte, 1 = short, 2 = long) */
790 19, /* bitsize */
791 TRUE, /* pc_relative */
792 0, /* bitpos */
793 complain_overflow_signed, /* complain_on_overflow */
794 mmix_elf_reloc, /* special_function */
795 "R_MMIX_PUSHJ_STUBBABLE", /* name */
796 FALSE, /* partial_inplace */
797 ~0x0100ffff, /* src_mask */
798 0x0100ffff, /* dst_mask */
799 TRUE) /* pcrel_offset */
3c3bdf30
NC		 800 };
801
802
803/* Map BFD reloc types to MMIX ELF reloc types. */
804
805struct mmix_reloc_map
806 {
807 bfd_reloc_code_real_type bfd_reloc_val;
808 enum elf_mmix_reloc_type elf_reloc_val;
809 };
810
811
812static const struct mmix_reloc_map mmix_reloc_map[] =
813 {
814 {BFD_RELOC_NONE, R_MMIX_NONE},
815 {BFD_RELOC_8, R_MMIX_8},
816 {BFD_RELOC_16, R_MMIX_16},
817 {BFD_RELOC_24, R_MMIX_24},
818 {BFD_RELOC_32, R_MMIX_32},
819 {BFD_RELOC_64, R_MMIX_64},
820 {BFD_RELOC_8_PCREL, R_MMIX_PC_8},
821 {BFD_RELOC_16_PCREL, R_MMIX_PC_16},
822 {BFD_RELOC_24_PCREL, R_MMIX_PC_24},
823 {BFD_RELOC_32_PCREL, R_MMIX_PC_32},
824 {BFD_RELOC_64_PCREL, R_MMIX_PC_64},
825 {BFD_RELOC_VTABLE_INHERIT, R_MMIX_GNU_VTINHERIT},
826 {BFD_RELOC_VTABLE_ENTRY, R_MMIX_GNU_VTENTRY},
827 {BFD_RELOC_MMIX_GETA, R_MMIX_GETA},
828 {BFD_RELOC_MMIX_CBRANCH, R_MMIX_CBRANCH},
829 {BFD_RELOC_MMIX_PUSHJ, R_MMIX_PUSHJ},
830 {BFD_RELOC_MMIX_JMP, R_MMIX_JMP},
831 {BFD_RELOC_MMIX_ADDR19, R_MMIX_ADDR19},
832 {BFD_RELOC_MMIX_ADDR27, R_MMIX_ADDR27},
833 {BFD_RELOC_MMIX_REG_OR_BYTE, R_MMIX_REG_OR_BYTE},
834 {BFD_RELOC_MMIX_REG, R_MMIX_REG},
835 {BFD_RELOC_MMIX_BASE_PLUS_OFFSET, R_MMIX_BASE_PLUS_OFFSET},
f60ebe14
HPN		 836 {BFD_RELOC_MMIX_LOCAL, R_MMIX_LOCAL},
837 {BFD_RELOC_MMIX_PUSHJ_STUBBABLE, R_MMIX_PUSHJ_STUBBABLE}
3c3bdf30
NC		 838 };
839
840static reloc_howto_type *
841bfd_elf64_bfd_reloc_type_lookup (abfd, code)
842 bfd *abfd ATTRIBUTE_UNUSED;
843 bfd_reloc_code_real_type code;
844{
845 unsigned int i;
846
847 for (i = 0;
848 i < sizeof (mmix_reloc_map) / sizeof (mmix_reloc_map[0]);
849 i++)
850 {
851 if (mmix_reloc_map[i].bfd_reloc_val == code)
852 return &elf_mmix_howto_table[mmix_reloc_map[i].elf_reloc_val];
853 }
854
855 return NULL;
856}
857
f0abc2a1
AM		 858static bfd_boolean
859mmix_elf_new_section_hook (abfd, sec)
860 bfd *abfd;
861 asection *sec;
862{
863 struct _mmix_elf_section_data *sdata;
864 bfd_size_type amt = sizeof (*sdata);
865
866 sdata = (struct _mmix_elf_section_data *) bfd_zalloc (abfd, amt);
867 if (sdata == NULL)
868 return FALSE;
869 sec->used_by_bfd = (PTR) sdata;
870
871 return _bfd_elf_new_section_hook (abfd, sec);
872}
873
3c3bdf30
NC		 874
875/* This function performs the actual bitfiddling and sanity check for a
876 final relocation. Each relocation gets its *worst*-case expansion
877 in size when it arrives here; any reduction in size should have been
878 caught in linker relaxation earlier. When we get here, the relocation
879 looks like the smallest instruction with SWYM:s (nop:s) appended to the
880 max size. We fill in those nop:s.
881
882 R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra)
883 GETA $N,foo
884 ->
885 SETL $N,foo & 0xffff
886 INCML $N,(foo >> 16) & 0xffff
887 INCMH $N,(foo >> 32) & 0xffff
888 INCH $N,(foo >> 48) & 0xffff
889
890 R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but
891 condbranches needing relaxation might be rare enough to not be
892 worthwhile.)
893 [P]Bcc $N,foo
894 ->
895 [~P]B~cc $N,.+20
896 SETL $255,foo & ...
897 INCML ...
898 INCMH ...
899 INCH ...
900 GO $255,$255,0
901
902 R_MMIX_PUSHJ: (FIXME: Relaxation...)
903 PUSHJ $N,foo
904 ->
905 SETL $255,foo & ...
906 INCML ...
907 INCMH ...
908 INCH ...
909 PUSHGO $N,$255,0
910
911 R_MMIX_JMP: (FIXME: Relaxation...)
912 JMP foo
913 ->
914 SETL $255,foo & ...
915 INCML ...
916 INCMH ...
917 INCH ...
918 GO $255,$255,0
919
920 R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */
921
922static bfd_reloc_status_type
923mmix_elf_perform_relocation (isec, howto, datap, addr, value)
924 asection *isec;
925 reloc_howto_type *howto;
926 PTR datap;
f60ebe14 927 bfd_vma addr;
3c3bdf30
NC		 928 bfd_vma value;
929{
930 bfd *abfd = isec->owner;
931 bfd_reloc_status_type flag = bfd_reloc_ok;
932 bfd_reloc_status_type r;
933 int offs = 0;
934 int reg = 255;
935
936 /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences.
937 We handle the differences here and the common sequence later. */
938 switch (howto->type)
939 {
940 case R_MMIX_GETA:
941 offs = 0;
942 reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1);
943
944 /* We change to an absolute value. */
945 value += addr;
946 break;
947
948 case R_MMIX_CBRANCH:
949 {
950 int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16;
951
952 /* Invert the condition and prediction bit, and set the offset
953 to five instructions ahead.
954
955 We *can* do better if we want to. If the branch is found to be
956 within limits, we could leave the branch as is; there'll just
957 be a bunch of NOP:s after it. But we shouldn't see this
958 sequence often enough that it's worth doing it. */
959
960 bfd_put_32 (abfd,
961 (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff)
962 | (24/4)),
963 (bfd_byte *) datap);
964
965 /* Put a "GO $255,$255,0" after the common sequence. */
966 bfd_put_32 (abfd,
967 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00,
968 (bfd_byte *) datap + 20);
969
970 /* Common sequence starts at offset 4. */
971 offs = 4;
972
973 /* We change to an absolute value. */
974 value += addr;
975 }
976 break;
977
f60ebe14
HPN		 978 case R_MMIX_PUSHJ_STUBBABLE:
979 /* If the address fits, we're fine. */
980 if ((value & 3) == 0
981 /* Note rightshift 0; see R_MMIX_JMP case below. */
982 && (r = bfd_check_overflow (complain_overflow_signed,
983 howto->bitsize,
984 0,
985 bfd_arch_bits_per_address (abfd),
986 value)) == bfd_reloc_ok)
987 goto pcrel_mmix_reloc_fits;
988 else
989 {
1a23a9e6 990 bfd_size_type size = isec->rawsize ? isec->rawsize : isec->size;
f60ebe14
HPN		 991
992 /* We have the bytes at the PUSHJ insn and need to get the
993 position for the stub. There's supposed to be room allocated
994 for the stub. */
995 bfd_byte *stubcontents
f075ee0c 996 = ((bfd_byte *) datap
f60ebe14 997 - (addr - (isec->output_section->vma + isec->output_offset))
eea6121a 998 + size
f60ebe14
HPN		 999 + mmix_elf_section_data (isec)->pjs.stub_offset);
1000 bfd_vma stubaddr;
1001
1002 /* The address doesn't fit, so redirect the PUSHJ to the
1003 location of the stub. */
1004 r = mmix_elf_perform_relocation (isec,
1005 &elf_mmix_howto_table
1006 [R_MMIX_ADDR19],
1007 datap,
1008 addr,
1009 isec->output_section->vma
1010 + isec->output_offset
eea6121a 1011 + size
f60ebe14
HPN		 1012 + (mmix_elf_section_data (isec)
1013 ->pjs.stub_offset)
1014 - addr);
1015 if (r != bfd_reloc_ok)
1016 return r;
1017
1018 stubaddr
1019 = (isec->output_section->vma
1020 + isec->output_offset
eea6121a 1021 + size
f60ebe14
HPN		 1022 + mmix_elf_section_data (isec)->pjs.stub_offset);
1023
1024 /* We generate a simple JMP if that suffices, else the whole 5
1025 insn stub. */
1026 if (bfd_check_overflow (complain_overflow_signed,
1027 elf_mmix_howto_table[R_MMIX_ADDR27].bitsize,
1028 0,
1029 bfd_arch_bits_per_address (abfd),
1030 addr + value - stubaddr) == bfd_reloc_ok)
1031 {
1032 bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents);
1033 r = mmix_elf_perform_relocation (isec,
1034 &elf_mmix_howto_table
1035 [R_MMIX_ADDR27],
1036 stubcontents,
1037 stubaddr,
1038 value + addr - stubaddr);
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;
930b4cb2
HPN		 1150 asection *bpo_greg_section
1151 = bpodata->bpo_greg_section;
1152 struct bpo_greg_section_info *gregdata
f0abc2a1 1153 = mmix_elf_section_data (bpo_greg_section)->bpo.greg;
930b4cb2
HPN		 1154 size_t bpo_index
1155 = gregdata->bpo_reloc_indexes[bpodata->bpo_index++];
1156
1157 /* A consistency check: The value we now have in "relocation" must
1158 be the same as the value we stored for that relocation. It
1159 doesn't cost much, so can be left in at all times. */
1160 if (value != gregdata->reloc_request[bpo_index].value)
1161 {
1162 (*_bfd_error_handler)
1163 (_("%s: Internal inconsistency error for value for\n\
1164 linker-allocated global register: linked: 0x%lx%08lx != relaxed: 0x%lx%08lx\n"),
1165 bfd_get_filename (isec->owner),
1166 (unsigned long) (value >> 32), (unsigned long) value,
1167 (unsigned long) (gregdata->reloc_request[bpo_index].value
1168 >> 32),
1169 (unsigned long) gregdata->reloc_request[bpo_index].value);
1170 bfd_set_error (bfd_error_bad_value);
1171 return bfd_reloc_overflow;
1172 }
1173
1174 /* Then store the register number and offset for that register
1175 into datap and datap + 1 respectively. */
1176 bfd_put_8 (abfd,
1177 gregdata->reloc_request[bpo_index].regindex
1178 + bpo_greg_section->output_section->vma / 8,
1179 datap);
1180 bfd_put_8 (abfd,
1181 gregdata->reloc_request[bpo_index].offset,
1182 ((unsigned char *) datap) + 1);
1183 return bfd_reloc_ok;
1184 }
1185
3c3bdf30
NC		 1186 case R_MMIX_REG_OR_BYTE:
1187 case R_MMIX_REG:
1188 if (value > 255)
1189 return bfd_reloc_overflow;
1190 bfd_put_8 (abfd, value, datap);
1191 return bfd_reloc_ok;
1192
1193 default:
1194 BAD_CASE (howto->type);
1195 }
1196
1197 /* This code adds the common SETL/INCML/INCMH/INCH worst-case
1198 sequence. */
1199
1200 /* Lowest two bits must be 0. We return bfd_reloc_overflow for
1201 everything that looks strange. */
1202 if (value & 3)
1203 flag = bfd_reloc_overflow;
1204
1205 bfd_put_32 (abfd,
1206 (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16),
1207 (bfd_byte *) datap + offs);
1208 bfd_put_32 (abfd,
1209 (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16),
1210 (bfd_byte *) datap + offs + 4);
1211 bfd_put_32 (abfd,
1212 (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16),
1213 (bfd_byte *) datap + offs + 8);
1214 bfd_put_32 (abfd,
1215 (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16),
1216 (bfd_byte *) datap + offs + 12);
1217
1218 return flag;
1219}
1220
1221/* Set the howto pointer for an MMIX ELF reloc (type RELA). */
1222
1223static void
1224mmix_info_to_howto_rela (abfd, cache_ptr, dst)
1225 bfd *abfd ATTRIBUTE_UNUSED;
1226 arelent *cache_ptr;
947216bf 1227 Elf_Internal_Rela *dst;
3c3bdf30
NC		 1228{
1229 unsigned int r_type;
1230
1231 r_type = ELF64_R_TYPE (dst->r_info);
1232 BFD_ASSERT (r_type < (unsigned int) R_MMIX_max);
1233 cache_ptr->howto = &elf_mmix_howto_table[r_type];
1234}
1235
1236/* Any MMIX-specific relocation gets here at assembly time or when linking
1237 to other formats (such as mmo); this is the relocation function from
1238 the reloc_table. We don't get here for final pure ELF linking. */
1239
1240static bfd_reloc_status_type
1241mmix_elf_reloc (abfd, reloc_entry, symbol, data, input_section,
1242 output_bfd, error_message)
1243 bfd *abfd;
1244 arelent *reloc_entry;
1245 asymbol *symbol;
1246 PTR data;
1247 asection *input_section;
1248 bfd *output_bfd;
1249 char **error_message ATTRIBUTE_UNUSED;
1250{
1251 bfd_vma relocation;
1252 bfd_reloc_status_type r;
1253 asection *reloc_target_output_section;
1254 bfd_reloc_status_type flag = bfd_reloc_ok;
1255 bfd_vma output_base = 0;
1256 bfd_vma addr;
1257
1258 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
1259 input_section, output_bfd, error_message);
1260
1261 /* If that was all that was needed (i.e. this isn't a final link, only
1262 some segment adjustments), we're done. */
1263 if (r != bfd_reloc_continue)
1264 return r;
1265
1266 if (bfd_is_und_section (symbol->section)
1267 && (symbol->flags & BSF_WEAK) == 0
1268 && output_bfd == (bfd *) NULL)
1269 return bfd_reloc_undefined;
1270
1271 /* Is the address of the relocation really within the section? */
07515404 1272 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
3c3bdf30
NC		 1273 return bfd_reloc_outofrange;
1274
4cc11e76 1275 /* Work out which section the relocation is targeted at and the
3c3bdf30
NC		 1276 initial relocation command value. */
1277
1278 /* Get symbol value. (Common symbols are special.) */
1279 if (bfd_is_com_section (symbol->section))
1280 relocation = 0;
1281 else
1282 relocation = symbol->value;
1283
1284 reloc_target_output_section = bfd_get_output_section (symbol);
1285
1286 /* Here the variable relocation holds the final address of the symbol we
1287 are relocating against, plus any addend. */
1288 if (output_bfd)
1289 output_base = 0;
1290 else
1291 output_base = reloc_target_output_section->vma;
1292
1293 relocation += output_base + symbol->section->output_offset;
1294
1295 /* Get position of relocation. */
1296 addr = (reloc_entry->address + input_section->output_section->vma
1297 + input_section->output_offset);
1298 if (output_bfd != (bfd *) NULL)
1299 {
1300 /* Add in supplied addend. */
1301 relocation += reloc_entry->addend;
1302
1303 /* This is a partial relocation, and we want to apply the
1304 relocation to the reloc entry rather than the raw data.
1305 Modify the reloc inplace to reflect what we now know. */
1306 reloc_entry->addend = relocation;
1307 reloc_entry->address += input_section->output_offset;
1308 return flag;
1309 }
1310
1311 return mmix_final_link_relocate (reloc_entry->howto, input_section,
1312 data, reloc_entry->address,
1313 reloc_entry->addend, relocation,
1314 bfd_asymbol_name (symbol),
1315 reloc_target_output_section);
1316}
e06fcc86 1317\f
3c3bdf30
NC		 1318/* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it
1319 for guidance if you're thinking of copying this. */
1320
b34976b6 1321static bfd_boolean
3c3bdf30
NC		 1322mmix_elf_relocate_section (output_bfd, info, input_bfd, input_section,
1323 contents, relocs, local_syms, local_sections)
1324 bfd *output_bfd ATTRIBUTE_UNUSED;
1325 struct bfd_link_info *info;
1326 bfd *input_bfd;
1327 asection *input_section;
1328 bfd_byte *contents;
1329 Elf_Internal_Rela *relocs;
1330 Elf_Internal_Sym *local_syms;
1331 asection **local_sections;
1332{
1333 Elf_Internal_Shdr *symtab_hdr;
1334 struct elf_link_hash_entry **sym_hashes;
1335 Elf_Internal_Rela *rel;
1336 Elf_Internal_Rela *relend;
1a23a9e6 1337 bfd_size_type size;
f60ebe14 1338 size_t pjsno = 0;
3c3bdf30 1339
1a23a9e6 1340 size = input_section->rawsize ? input_section->rawsize : input_section->size;
3c3bdf30
NC		 1341 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1342 sym_hashes = elf_sym_hashes (input_bfd);
1343 relend = relocs + input_section->reloc_count;
1344
1a23a9e6
AM		 1345 /* Zero the stub area before we start. */
1346 if (input_section->rawsize != 0
1347 && input_section->size > input_section->rawsize)
1348 memset (contents + input_section->rawsize, 0,
1349 input_section->size - input_section->rawsize);
1350
3c3bdf30
NC		 1351 for (rel = relocs; rel < relend; rel ++)
1352 {
1353 reloc_howto_type *howto;
1354 unsigned long r_symndx;
1355 Elf_Internal_Sym *sym;
1356 asection *sec;
1357 struct elf_link_hash_entry *h;
1358 bfd_vma relocation;
1359 bfd_reloc_status_type r;
1360 const char *name = NULL;
1361 int r_type;
b34976b6 1362 bfd_boolean undefined_signalled = FALSE;
3c3bdf30
NC		 1363
1364 r_type = ELF64_R_TYPE (rel->r_info);
1365
1366 if (r_type == R_MMIX_GNU_VTINHERIT
1367 || r_type == R_MMIX_GNU_VTENTRY)
1368 continue;
1369
1370 r_symndx = ELF64_R_SYM (rel->r_info);
1371
1049f94e 1372 if (info->relocatable)
3c3bdf30 1373 {
f60ebe14
HPN		 1374 /* This is a relocatable link. For most relocs we don't have to
1375 change anything, unless the reloc is against a section
1376 symbol, in which case we have to adjust according to where
1377 the section symbol winds up in the output section. */
3c3bdf30
NC		 1378 if (r_symndx < symtab_hdr->sh_info)
1379 {
1380 sym = local_syms + r_symndx;
1381
1382 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1383 {
1384 sec = local_sections [r_symndx];
1385 rel->r_addend += sec->output_offset + sym->st_value;
1386 }
1387 }
1388
f60ebe14
HPN		 1389 /* For PUSHJ stub relocs however, we may need to change the
1390 reloc and the section contents, if the reloc doesn't reach
1391 beyond the end of the output section and previous stubs.
1392 Then we change the section contents to be a PUSHJ to the end
1393 of the input section plus stubs (we can do that without using
1394 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ
1395 at the stub location. */
1396 if (r_type == R_MMIX_PUSHJ_STUBBABLE)
1397 {
1398 /* We've already checked whether we need a stub; use that
1399 knowledge. */
1400 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno]
1401 != 0)
1402 {
1403 Elf_Internal_Rela relcpy;
1404
1405 if (mmix_elf_section_data (input_section)
1406 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE)
1407 abort ();
1408
1409 /* There's already a PUSHJ insn there, so just fill in
1410 the offset bits to the stub. */
1411 if (mmix_final_link_relocate (elf_mmix_howto_table
1412 + R_MMIX_ADDR19,
1413 input_section,
1414 contents,
1415 rel->r_offset,
1416 0,
1417 input_section
1418 ->output_section->vma
1419 + input_section->output_offset
eea6121a 1420 + size
f60ebe14
HPN		 1421 + mmix_elf_section_data (input_section)
1422 ->pjs.stub_offset,
1423 NULL, NULL) != bfd_reloc_ok)
1424 return FALSE;
1425
1426 /* Put a JMP insn at the stub; it goes with the
1427 R_MMIX_JMP reloc. */
1428 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24,
1429 contents
eea6121a 1430 + size
f60ebe14
HPN		 1431 + mmix_elf_section_data (input_section)
1432 ->pjs.stub_offset);
1433
1434 /* Change the reloc to be at the stub, and to a full
1435 R_MMIX_JMP reloc. */
1436 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP);
1437 rel->r_offset
eea6121a 1438 = (size
f60ebe14
HPN		 1439 + mmix_elf_section_data (input_section)
1440 ->pjs.stub_offset);
1441
1442 mmix_elf_section_data (input_section)->pjs.stub_offset
1443 += MAX_PUSHJ_STUB_SIZE;
1444
1445 /* Shift this reloc to the end of the relocs to maintain
1446 the r_offset sorted reloc order. */
1447 relcpy = *rel;
1448 memmove (rel, rel + 1, (char *) relend - (char *) rel);
1449 relend[-1] = relcpy;
1450
1451 /* Back up one reloc, or else we'd skip the next reloc
1452 in turn. */
1453 rel--;
1454 }
1455
1456 pjsno++;
1457 }
3c3bdf30
NC		 1458 continue;
1459 }
1460
1461 /* This is a final link. */
1462 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info);
1463 h = NULL;
1464 sym = NULL;
1465 sec = NULL;
1466
1467 if (r_symndx < symtab_hdr->sh_info)
1468 {
1469 sym = local_syms + r_symndx;
1470 sec = local_sections [r_symndx];
8517fae7 1471 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
3c3bdf30 1472
6a9cae7f
AM		 1473 name = bfd_elf_string_from_elf_section (input_bfd,
1474 symtab_hdr->sh_link,
1475 sym->st_name);
1476 if (name == NULL)
1477 name = bfd_section_name (input_bfd, sec);
3c3bdf30
NC		 1478 }
1479 else
1480 {
59c2e50f 1481 bfd_boolean unresolved_reloc;
3c3bdf30 1482
b2a8e766
AM		 1483 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1484 r_symndx, symtab_hdr, sym_hashes,
1485 h, sec, relocation,
1486 unresolved_reloc, undefined_signalled);
6a9cae7f 1487 name = h->root.root.string;
3c3bdf30
NC		 1488 }
1489
1490 r = mmix_final_link_relocate (howto, input_section,
1491 contents, rel->r_offset,
1492 rel->r_addend, relocation, name, sec);
1493
1494 if (r != bfd_reloc_ok)
1495 {
b34976b6 1496 bfd_boolean check_ok = TRUE;
3c3bdf30
NC		 1497 const char * msg = (const char *) NULL;
1498
1499 switch (r)
1500 {
1501 case bfd_reloc_overflow:
1502 check_ok = info->callbacks->reloc_overflow
dfeffb9f
L		 1503 (info, (h ? &h->root : NULL), name, howto->name,
1504 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3c3bdf30
NC		 1505 break;
1506
1507 case bfd_reloc_undefined:
1508 /* We may have sent this message above. */
1509 if (! undefined_signalled)
1510 check_ok = info->callbacks->undefined_symbol
1511 (info, name, input_bfd, input_section, rel->r_offset,
b34976b6
AM		 1512 TRUE);
1513 undefined_signalled = TRUE;
3c3bdf30
NC		 1514 break;
1515
1516 case bfd_reloc_outofrange:
1517 msg = _("internal error: out of range error");
1518 break;
1519
1520 case bfd_reloc_notsupported:
1521 msg = _("internal error: unsupported relocation error");
1522 break;
1523
1524 case bfd_reloc_dangerous:
1525 msg = _("internal error: dangerous relocation");
1526 break;
1527
1528 default:
1529 msg = _("internal error: unknown error");
1530 break;
1531 }
1532
1533 if (msg)
1534 check_ok = info->callbacks->warning
1535 (info, msg, name, input_bfd, input_section, rel->r_offset);
1536
1537 if (! check_ok)
b34976b6 1538 return FALSE;
3c3bdf30
NC		 1539 }
1540 }
1541
b34976b6 1542 return TRUE;
3c3bdf30 1543}
e06fcc86 1544\f
3c3bdf30
NC		 1545/* Perform a single relocation. By default we use the standard BFD
1546 routines. A few relocs we have to do ourselves. */
1547
1548static bfd_reloc_status_type
1549mmix_final_link_relocate (howto, input_section, contents,
1550 r_offset, r_addend, relocation, symname, symsec)
1551 reloc_howto_type *howto;
1552 asection *input_section;
1553 bfd_byte *contents;
1554 bfd_vma r_offset;
1555 bfd_signed_vma r_addend;
1556 bfd_vma relocation;
1557 const char *symname;
1558 asection *symsec;
1559{
1560 bfd_reloc_status_type r = bfd_reloc_ok;
1561 bfd_vma addr
1562 = (input_section->output_section->vma
1563 + input_section->output_offset
1564 + r_offset);
1565 bfd_signed_vma srel
1566 = (bfd_signed_vma) relocation + r_addend;
1567
1568 switch (howto->type)
1569 {
1570 /* All these are PC-relative. */
f60ebe14 1571 case R_MMIX_PUSHJ_STUBBABLE:
3c3bdf30
NC		 1572 case R_MMIX_PUSHJ:
1573 case R_MMIX_CBRANCH:
1574 case R_MMIX_ADDR19:
1575 case R_MMIX_GETA:
1576 case R_MMIX_ADDR27:
1577 case R_MMIX_JMP:
1578 contents += r_offset;
1579
1580 srel -= (input_section->output_section->vma
1581 + input_section->output_offset
1582 + r_offset);
1583
1584 r = mmix_elf_perform_relocation (input_section, howto, contents,
1585 addr, srel);
1586 break;
1587
930b4cb2
HPN		 1588 case R_MMIX_BASE_PLUS_OFFSET:
1589 if (symsec == NULL)
1590 return bfd_reloc_undefined;
1591
1592 /* Check that we're not relocating against a register symbol. */
1593 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1594 MMIX_REG_CONTENTS_SECTION_NAME) == 0
1595 || strcmp (bfd_get_section_name (symsec->owner, symsec),
1596 MMIX_REG_SECTION_NAME) == 0)
1597 {
1598 /* Note: This is separated out into two messages in order
1599 to ease the translation into other languages. */
1600 if (symname == NULL || *symname == 0)
1601 (*_bfd_error_handler)
1602 (_("%s: base-plus-offset relocation against register symbol: (unknown) in %s"),
1603 bfd_get_filename (input_section->owner),
1604 bfd_get_section_name (symsec->owner, symsec));
1605 else
1606 (*_bfd_error_handler)
1607 (_("%s: base-plus-offset relocation against register symbol: %s in %s"),
1608 bfd_get_filename (input_section->owner), symname,
1609 bfd_get_section_name (symsec->owner, symsec));
1610 return bfd_reloc_overflow;
1611 }
1612 goto do_mmix_reloc;
1613
3c3bdf30
NC		 1614 case R_MMIX_REG_OR_BYTE:
1615 case R_MMIX_REG:
1616 /* For now, we handle these alike. They must refer to an register
1617 symbol, which is either relative to the register section and in
1618 the range 0..255, or is in the register contents section with vma
1619 regno * 8. */
1620
1621 /* FIXME: A better way to check for reg contents section?
1622 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */
1623 if (symsec == NULL)
1624 return bfd_reloc_undefined;
1625
1626 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1627 MMIX_REG_CONTENTS_SECTION_NAME) == 0)
1628 {
1629 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
1630 {
1631 /* The bfd_reloc_outofrange return value, though intuitively
1632 a better value, will not get us an error. */
1633 return bfd_reloc_overflow;
1634 }
1635 srel /= 8;
1636 }
1637 else if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1638 MMIX_REG_SECTION_NAME) == 0)
1639 {
1640 if (srel < 0 || srel > 255)
1641 /* The bfd_reloc_outofrange return value, though intuitively a
1642 better value, will not get us an error. */
1643 return bfd_reloc_overflow;
1644 }
1645 else
1646 {
930b4cb2 1647 /* Note: This is separated out into two messages in order
ca09e32b
NC		 1648 to ease the translation into other languages. */
1649 if (symname == NULL || *symname == 0)
1650 (*_bfd_error_handler)
1651 (_("%s: register relocation against non-register symbol: (unknown) in %s"),
1652 bfd_get_filename (input_section->owner),
1653 bfd_get_section_name (symsec->owner, symsec));
1654 else
1655 (*_bfd_error_handler)
1656 (_("%s: register relocation against non-register symbol: %s in %s"),
1657 bfd_get_filename (input_section->owner), symname,
1658 bfd_get_section_name (symsec->owner, symsec));
3c3bdf30
NC		 1659
1660 /* The bfd_reloc_outofrange return value, though intuitively a
1661 better value, will not get us an error. */
1662 return bfd_reloc_overflow;
1663 }
930b4cb2 1664 do_mmix_reloc:
3c3bdf30
NC		 1665 contents += r_offset;
1666 r = mmix_elf_perform_relocation (input_section, howto, contents,
1667 addr, srel);
1668 break;
1669
1670 case R_MMIX_LOCAL:
1671 /* This isn't a real relocation, it's just an assertion that the
1672 final relocation value corresponds to a local register. We
1673 ignore the actual relocation; nothing is changed. */
1674 {
1675 asection *regsec
1676 = bfd_get_section_by_name (input_section->output_section->owner,
1677 MMIX_REG_CONTENTS_SECTION_NAME);
1678 bfd_vma first_global;
1679
1680 /* Check that this is an absolute value, or a reference to the
1681 register contents section or the register (symbol) section.
1682 Absolute numbers can get here as undefined section. Undefined
1683 symbols are signalled elsewhere, so there's no conflict in us
1684 accidentally handling it. */
1685 if (!bfd_is_abs_section (symsec)
1686 && !bfd_is_und_section (symsec)
1687 && strcmp (bfd_get_section_name (symsec->owner, symsec),
1688 MMIX_REG_CONTENTS_SECTION_NAME) != 0
1689 && strcmp (bfd_get_section_name (symsec->owner, symsec),
1690 MMIX_REG_SECTION_NAME) != 0)
1691 {
1692 (*_bfd_error_handler)
1693 (_("%s: directive LOCAL valid only with a register or absolute value"),
1694 bfd_get_filename (input_section->owner));
1695
1696 return bfd_reloc_overflow;
1697 }
1698
1699 /* If we don't have a register contents section, then $255 is the
1700 first global register. */
1701 if (regsec == NULL)
1702 first_global = 255;
1703 else
1704 {
1705 first_global = bfd_get_section_vma (abfd, regsec) / 8;
1706 if (strcmp (bfd_get_section_name (symsec->owner, symsec),
1707 MMIX_REG_CONTENTS_SECTION_NAME) == 0)
1708 {
1709 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
1710 /* The bfd_reloc_outofrange return value, though
1711 intuitively a better value, will not get us an error. */
1712 return bfd_reloc_overflow;
1713 srel /= 8;
1714 }
1715 }
1716
1717 if ((bfd_vma) srel >= first_global)
1718 {
1719 /* FIXME: Better error message. */
1720 (*_bfd_error_handler)
1721 (_("%s: LOCAL directive: Register $%ld is not a local register. First global register is $%ld."),
1722 bfd_get_filename (input_section->owner), (long) srel, (long) first_global);
1723
1724 return bfd_reloc_overflow;
1725 }
1726 }
1727 r = bfd_reloc_ok;
1728 break;
1729
1730 default:
1731 r = _bfd_final_link_relocate (howto, input_section->owner, input_section,
1732 contents, r_offset,
1733 relocation, r_addend);
1734 }
1735
1736 return r;
1737}
e06fcc86 1738\f
3c3bdf30
NC		 1739/* Return the section that should be marked against GC for a given
1740 relocation. */
1741
1742static asection *
1e2f5b6e
AM		 1743mmix_elf_gc_mark_hook (sec, info, rel, h, sym)
1744 asection *sec;
3c3bdf30
NC		 1745 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1746 Elf_Internal_Rela *rel;
1747 struct elf_link_hash_entry *h;
1748 Elf_Internal_Sym *sym;
1749{
1750 if (h != NULL)
1751 {
1752 switch (ELF64_R_TYPE (rel->r_info))
1753 {
1754 case R_MMIX_GNU_VTINHERIT:
1755 case R_MMIX_GNU_VTENTRY:
1756 break;
1757
1758 default:
1759 switch (h->root.type)
1760 {
1761 case bfd_link_hash_defined:
1762 case bfd_link_hash_defweak:
1763 return h->root.u.def.section;
1764
1765 case bfd_link_hash_common:
1766 return h->root.u.c.p->section;
1767
1768 default:
1769 break;
1770 }
1771 }
1772 }
1773 else
1e2f5b6e 1774 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
3c3bdf30
NC		 1775
1776 return NULL;
1777}
930b4cb2
HPN		 1778
1779/* Update relocation info for a GC-excluded section. We could supposedly
1780 perform the allocation after GC, but there's no suitable hook between
1781 GC (or section merge) and the point when all input sections must be
1782 present. Better to waste some memory and (perhaps) a little time. */
1783
b34976b6 1784static bfd_boolean
930b4cb2
HPN		 1785mmix_elf_gc_sweep_hook (abfd, info, sec, relocs)
1786 bfd *abfd ATTRIBUTE_UNUSED;
1787 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1788 asection *sec ATTRIBUTE_UNUSED;
1789 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
1790{
1791 struct bpo_reloc_section_info *bpodata
f0abc2a1 1792 = mmix_elf_section_data (sec)->bpo.reloc;
930b4cb2
HPN		 1793 asection *allocated_gregs_section;
1794
1795 /* If no bpodata here, we have nothing to do. */
1796 if (bpodata == NULL)
b34976b6 1797 return TRUE;
930b4cb2
HPN		 1798
1799 allocated_gregs_section = bpodata->bpo_greg_section;
1800
f0abc2a1 1801 mmix_elf_section_data (allocated_gregs_section)->bpo.greg->n_bpo_relocs
930b4cb2
HPN		 1802 -= bpodata->n_bpo_relocs_this_section;
1803
b34976b6 1804 return TRUE;
930b4cb2 1805}
e06fcc86 1806\f
3c3bdf30
NC		 1807/* Sort register relocs to come before expanding relocs. */
1808
1809static int
1810mmix_elf_sort_relocs (p1, p2)
1811 const PTR p1;
1812 const PTR p2;
1813{
1814 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1;
1815 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2;
1816 int r1_is_reg, r2_is_reg;
1817
1818 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive
1819 insns. */
1820 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3))
1821 return 1;
1822 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3))
1823 return -1;
1824
1825 r1_is_reg
1826 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE
1827 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG);
1828 r2_is_reg
1829 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE
1830 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG);
1831 if (r1_is_reg != r2_is_reg)
1832 return r2_is_reg - r1_is_reg;
1833
1834 /* Neither or both are register relocs. Then sort on full offset. */
1835 if (r1->r_offset > r2->r_offset)
1836 return 1;
1837 else if (r1->r_offset < r2->r_offset)
1838 return -1;
1839 return 0;
1840}
1841
930b4cb2
HPN		 1842/* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */
1843
b34976b6 1844static bfd_boolean
930b4cb2
HPN		 1845mmix_elf_check_common_relocs (abfd, info, sec, relocs)
1846 bfd *abfd;
1847 struct bfd_link_info *info;
1848 asection *sec;
1849 const Elf_Internal_Rela *relocs;
1850{
1851 bfd *bpo_greg_owner = NULL;
1852 asection *allocated_gregs_section = NULL;
1853 struct bpo_greg_section_info *gregdata = NULL;
1854 struct bpo_reloc_section_info *bpodata = NULL;
1855 const Elf_Internal_Rela *rel;
1856 const Elf_Internal_Rela *rel_end;
1857
930b4cb2
HPN		 1858 /* We currently have to abuse this COFF-specific member, since there's
1859 no target-machine-dedicated member. There's no alternative outside
1860 the bfd_link_info struct; we can't specialize a hash-table since
1861 they're different between ELF and mmo. */
1862 bpo_greg_owner = (bfd *) info->base_file;
1863
1864 rel_end = relocs + sec->reloc_count;
1865 for (rel = relocs; rel < rel_end; rel++)
1866 {
1867 switch (ELF64_R_TYPE (rel->r_info))
1868 {
1869 /* This relocation causes a GREG allocation. We need to count
1870 them, and we need to create a section for them, so we need an
1871 object to fake as the owner of that section. We can't use
1872 the ELF dynobj for this, since the ELF bits assume lots of
1873 DSO-related stuff if that member is non-NULL. */
1874 case R_MMIX_BASE_PLUS_OFFSET:
f60ebe14
HPN		 1875 /* We don't do anything with this reloc for a relocatable link. */
1876 if (info->relocatable)
1877 break;
1878
930b4cb2
HPN		 1879 if (bpo_greg_owner == NULL)
1880 {
1881 bpo_greg_owner = abfd;
1882 info->base_file = (PTR) bpo_greg_owner;
1883 }
1884
4fa5c2a8
HPN		 1885 if (allocated_gregs_section == NULL)
1886 allocated_gregs_section
1887 = bfd_get_section_by_name (bpo_greg_owner,
1888 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
1889
930b4cb2
HPN		 1890 if (allocated_gregs_section == NULL)
1891 {
1892 allocated_gregs_section
3496cb2a
L		 1893 = bfd_make_section_with_flags (bpo_greg_owner,
1894 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME,
1895 (SEC_HAS_CONTENTS
1896 | SEC_IN_MEMORY
1897 | SEC_LINKER_CREATED));
930b4cb2
HPN		 1898 /* Setting both SEC_ALLOC and SEC_LOAD means the section is
1899 treated like any other section, and we'd get errors for
1900 address overlap with the text section. Let's set none of
1901 those flags, as that is what currently happens for usual
1902 GREG allocations, and that works. */
1903 if (allocated_gregs_section == NULL
930b4cb2
HPN		 1904 || !bfd_set_section_alignment (bpo_greg_owner,
1905 allocated_gregs_section,
1906 3))
b34976b6 1907 return FALSE;
930b4cb2
HPN		 1908
1909 gregdata = (struct bpo_greg_section_info *)
1910 bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info));
1911 if (gregdata == NULL)
b34976b6 1912 return FALSE;
f0abc2a1
AM		 1913 mmix_elf_section_data (allocated_gregs_section)->bpo.greg
1914 = gregdata;
930b4cb2
HPN		 1915 }
1916 else if (gregdata == NULL)
f0abc2a1
AM		 1917 gregdata
1918 = mmix_elf_section_data (allocated_gregs_section)->bpo.greg;
930b4cb2
HPN		 1919
1920 /* Get ourselves some auxiliary info for the BPO-relocs. */
1921 if (bpodata == NULL)
1922 {
1923 /* No use doing a separate iteration pass to find the upper
1924 limit - just use the number of relocs. */
1925 bpodata = (struct bpo_reloc_section_info *)
1926 bfd_alloc (bpo_greg_owner,
1927 sizeof (struct bpo_reloc_section_info)
1928 * (sec->reloc_count + 1));
1929 if (bpodata == NULL)
b34976b6 1930 return FALSE;
f0abc2a1 1931 mmix_elf_section_data (sec)->bpo.reloc = bpodata;
930b4cb2
HPN		 1932 bpodata->first_base_plus_offset_reloc
1933 = bpodata->bpo_index
1934 = gregdata->n_max_bpo_relocs;
1935 bpodata->bpo_greg_section
1936 = allocated_gregs_section;
4fa5c2a8 1937 bpodata->n_bpo_relocs_this_section = 0;
930b4cb2
HPN		 1938 }
1939
1940 bpodata->n_bpo_relocs_this_section++;
1941 gregdata->n_max_bpo_relocs++;
1942
1943 /* We don't get another chance to set this before GC; we've not
f60ebe14 1944 set up any hook that runs before GC. */
930b4cb2
HPN		 1945 gregdata->n_bpo_relocs
1946 = gregdata->n_max_bpo_relocs;
1947 break;
f60ebe14
HPN		 1948
1949 case R_MMIX_PUSHJ_STUBBABLE:
1950 mmix_elf_section_data (sec)->pjs.n_pushj_relocs++;
1951 break;
930b4cb2
HPN		 1952 }
1953 }
1954
f60ebe14
HPN		 1955 /* Allocate per-reloc stub storage and initialize it to the max stub
1956 size. */
1957 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0)
1958 {
1959 size_t i;
1960
1961 mmix_elf_section_data (sec)->pjs.stub_size
1962 = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs
1963 * sizeof (mmix_elf_section_data (sec)
1964 ->pjs.stub_size[0]));
1965 if (mmix_elf_section_data (sec)->pjs.stub_size == NULL)
1966 return FALSE;
1967
1968 for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++)
1969 mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE;
1970 }
1971
b34976b6 1972 return TRUE;
930b4cb2
HPN		 1973}
1974
3c3bdf30
NC		 1975/* Look through the relocs for a section during the first phase. */
1976
b34976b6 1977static bfd_boolean
3c3bdf30
NC		 1978mmix_elf_check_relocs (abfd, info, sec, relocs)
1979 bfd *abfd;
1980 struct bfd_link_info *info;
1981 asection *sec;
1982 const Elf_Internal_Rela *relocs;
1983{
1984 Elf_Internal_Shdr *symtab_hdr;
1985 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
1986 const Elf_Internal_Rela *rel;
1987 const Elf_Internal_Rela *rel_end;
1988
3c3bdf30
NC		 1989 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1990 sym_hashes = elf_sym_hashes (abfd);
1991 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf64_External_Sym);
1992 if (!elf_bad_symtab (abfd))
1993 sym_hashes_end -= symtab_hdr->sh_info;
1994
1995 /* First we sort the relocs so that any register relocs come before
1996 expansion-relocs to the same insn. FIXME: Not done for mmo. */
1997 qsort ((PTR) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
1998 mmix_elf_sort_relocs);
1999
930b4cb2
HPN		 2000 /* Do the common part. */
2001 if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs))
b34976b6 2002 return FALSE;
930b4cb2 2003
f60ebe14
HPN		 2004 if (info->relocatable)
2005 return TRUE;
2006
3c3bdf30
NC		 2007 rel_end = relocs + sec->reloc_count;
2008 for (rel = relocs; rel < rel_end; rel++)
2009 {
2010 struct elf_link_hash_entry *h;
2011 unsigned long r_symndx;
2012
2013 r_symndx = ELF64_R_SYM (rel->r_info);
2014 if (r_symndx < symtab_hdr->sh_info)
2015 h = NULL;
2016 else
2017 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2018
2019 switch (ELF64_R_TYPE (rel->r_info))
930b4cb2 2020 {
3c3bdf30
NC		 2021 /* This relocation describes the C++ object vtable hierarchy.
2022 Reconstruct it for later use during GC. */
2023 case R_MMIX_GNU_VTINHERIT:
c152c796 2024 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
b34976b6 2025 return FALSE;
3c3bdf30
NC		 2026 break;
2027
2028 /* This relocation describes which C++ vtable entries are actually
2029 used. Record for later use during GC. */
2030 case R_MMIX_GNU_VTENTRY:
c152c796 2031 if (!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
930b4cb2
HPN		 2044_bfd_mmix_check_all_relocs (abfd, info)
2045 bfd *abfd;
2046 struct bfd_link_info *info;
2047{
2048 asection *o;
2049
2050 for (o = abfd->sections; o != NULL; o = o->next)
2051 {
2052 Elf_Internal_Rela *internal_relocs;
b34976b6 2053 bfd_boolean ok;
930b4cb2
HPN		 2054
2055 if ((o->flags & SEC_RELOC) == 0
2056 || o->reloc_count == 0
2057 || ((info->strip == strip_all || info->strip == strip_debugger)
2058 && (o->flags & SEC_DEBUGGING) != 0)
2059 || bfd_is_abs_section (o->output_section))
2060 continue;
2061
2062 internal_relocs
45d6a902
AM		 2063 = _bfd_elf_link_read_relocs (abfd, o, (PTR) NULL,
2064 (Elf_Internal_Rela *) NULL,
2065 info->keep_memory);
930b4cb2 2066 if (internal_relocs == NULL)
b34976b6 2067 return FALSE;
930b4cb2
HPN		 2068
2069 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs);
2070
2071 if (! info->keep_memory)
2072 free (internal_relocs);
2073
2074 if (! ok)
b34976b6 2075 return FALSE;
3c3bdf30
NC		 2076 }
2077
b34976b6 2078 return TRUE;
3c3bdf30 2079}
e06fcc86 2080\f
3c3bdf30
NC		 2081/* Change symbols relative to the reg contents section to instead be to
2082 the register section, and scale them down to correspond to the register
2083 number. */
2084
b34976b6 2085static bfd_boolean
754021d0 2086mmix_elf_link_output_symbol_hook (info, name, sym, input_sec, h)
3c3bdf30
NC		 2087 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2088 const char *name ATTRIBUTE_UNUSED;
2089 Elf_Internal_Sym *sym;
2090 asection *input_sec;
754021d0 2091 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED;
3c3bdf30
NC		 2092{
2093 if (input_sec != NULL
2094 && input_sec->name != NULL
2095 && ELF_ST_TYPE (sym->st_info) != STT_SECTION
2096 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0)
2097 {
2098 sym->st_value /= 8;
2099 sym->st_shndx = SHN_REGISTER;
2100 }
2101
b34976b6 2102 return TRUE;
3c3bdf30
NC		 2103}
2104
2105/* We fake a register section that holds values that are register numbers.
2106 Having a SHN_REGISTER and register section translates better to other
2107 formats (e.g. mmo) than for example a STT_REGISTER attribute.
2108 This section faking is based on a construct in elf32-mips.c. */
2109static asection mmix_elf_reg_section;
2110static asymbol mmix_elf_reg_section_symbol;
2111static asymbol *mmix_elf_reg_section_symbol_ptr;
2112
f60ebe14 2113/* Handle the special section numbers that a symbol may use. */
3c3bdf30
NC		 2114
2115void
2116mmix_elf_symbol_processing (abfd, asym)
2117 bfd *abfd ATTRIBUTE_UNUSED;
2118 asymbol *asym;
2119{
2120 elf_symbol_type *elfsym;
2121
2122 elfsym = (elf_symbol_type *) asym;
2123 switch (elfsym->internal_elf_sym.st_shndx)
2124 {
2125 case SHN_REGISTER:
2126 if (mmix_elf_reg_section.name == NULL)
2127 {
2128 /* Initialize the register section. */
2129 mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME;
2130 mmix_elf_reg_section.flags = SEC_NO_FLAGS;
2131 mmix_elf_reg_section.output_section = &mmix_elf_reg_section;
2132 mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol;
2133 mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr;
2134 mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME;
2135 mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM;
2136 mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section;
2137 mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol;
2138 }
2139 asym->section = &mmix_elf_reg_section;
2140 break;
2141
2142 default:
2143 break;
2144 }
2145}
2146
2147/* Given a BFD section, try to locate the corresponding ELF section
2148 index. */
2149
b34976b6 2150static bfd_boolean
af746e92 2151mmix_elf_section_from_bfd_section (abfd, sec, retval)
3c3bdf30 2152 bfd * abfd ATTRIBUTE_UNUSED;
3c3bdf30
NC		 2153 asection * sec;
2154 int * retval;
2155{
2156 if (strcmp (bfd_get_section_name (abfd, sec), MMIX_REG_SECTION_NAME) == 0)
2157 *retval = SHN_REGISTER;
2158 else
b34976b6 2159 return FALSE;
3c3bdf30 2160
b34976b6 2161 return TRUE;
3c3bdf30
NC		 2162}
2163
2164/* Hook called by the linker routine which adds symbols from an object
2165 file. We must handle the special SHN_REGISTER section number here.
2166
2167 We also check that we only have *one* each of the section-start
2168 symbols, since otherwise having two with the same value would cause
2169 them to be "merged", but with the contents serialized. */
2170
b34976b6 2171bfd_boolean
3c3bdf30
NC		 2172mmix_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp)
2173 bfd *abfd;
2174 struct bfd_link_info *info ATTRIBUTE_UNUSED;
555cd476 2175 Elf_Internal_Sym *sym;
3c3bdf30
NC		 2176 const char **namep ATTRIBUTE_UNUSED;
2177 flagword *flagsp ATTRIBUTE_UNUSED;
2178 asection **secp;
2179 bfd_vma *valp ATTRIBUTE_UNUSED;
2180{
2181 if (sym->st_shndx == SHN_REGISTER)
2182 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME);
2183 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.'
2184 && strncmp (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX,
2185 strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) == 0)
2186 {
2187 /* See if we have another one. */
4ab82700
AM		 2188 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash,
2189 *namep,
b34976b6
AM		 2190 FALSE,
2191 FALSE,
2192 FALSE);
3c3bdf30 2193
4ab82700 2194 if (h != NULL && h->type != bfd_link_hash_undefined)
3c3bdf30
NC		 2195 {
2196 /* How do we get the asymbol (or really: the filename) from h?
4ab82700 2197 h->u.def.section->owner is NULL. */
3c3bdf30
NC		 2198 ((*_bfd_error_handler)
2199 (_("%s: Error: multiple definition of `%s'; start of %s is set in a earlier linked file\n"),
2200 bfd_get_filename (abfd), *namep,
2201 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)));
2202 bfd_set_error (bfd_error_bad_value);
b34976b6 2203 return FALSE;
3c3bdf30
NC		 2204 }
2205 }
2206
b34976b6 2207 return TRUE;
3c3bdf30
NC		 2208}
2209
2210/* We consider symbols matching "L.*:[0-9]+" to be local symbols. */
2211
b34976b6 2212bfd_boolean
3c3bdf30
NC		 2213mmix_elf_is_local_label_name (abfd, name)
2214 bfd *abfd;
2215 const char *name;
2216{
2217 const char *colpos;
2218 int digits;
2219
2220 /* Also include the default local-label definition. */
2221 if (_bfd_elf_is_local_label_name (abfd, name))
b34976b6 2222 return TRUE;
3c3bdf30
NC		 2223
2224 if (*name != 'L')
b34976b6 2225 return FALSE;
3c3bdf30
NC		 2226
2227 /* If there's no ":", or more than one, it's not a local symbol. */
2228 colpos = strchr (name, ':');
2229 if (colpos == NULL || strchr (colpos + 1, ':') != NULL)
b34976b6 2230 return FALSE;
3c3bdf30
NC		 2231
2232 /* Check that there are remaining characters and that they are digits. */
2233 if (colpos[1] == 0)
b34976b6 2234 return FALSE;
3c3bdf30
NC		 2235
2236 digits = strspn (colpos + 1, "0123456789");
2237 return digits != 0 && colpos[1 + digits] == 0;
2238}
2239
2240/* We get rid of the register section here. */
2241
b34976b6 2242bfd_boolean
3c3bdf30
NC		 2243mmix_elf_final_link (abfd, info)
2244 bfd *abfd;
2245 struct bfd_link_info *info;
2246{
2247 /* We never output a register section, though we create one for
2248 temporary measures. Check that nobody entered contents into it. */
2249 asection *reg_section;
3c3bdf30
NC		 2250
2251 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME);
2252
2253 if (reg_section != NULL)
2254 {
2255 /* FIXME: Pass error state gracefully. */
2256 if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS)
2257 _bfd_abort (__FILE__, __LINE__, _("Register section has contents\n"));
2258
3c3bdf30 2259 /* Really remove the section. */
5daa8fe7 2260 bfd_section_list_remove (abfd, reg_section);
3c3bdf30
NC		 2261 --abfd->section_count;
2262 }
2263
c152c796 2264 if (! bfd_elf_final_link (abfd, info))
b34976b6 2265 return FALSE;
3c3bdf30 2266
930b4cb2
HPN		 2267 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by
2268 the regular linker machinery. We do it here, like other targets with
2269 special sections. */
2270 if (info->base_file != NULL)
2271 {
2272 asection *greg_section
2273 = bfd_get_section_by_name ((bfd *) info->base_file,
2274 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2275 if (!bfd_set_section_contents (abfd,
2276 greg_section->output_section,
2277 greg_section->contents,
2278 (file_ptr) greg_section->output_offset,
eea6121a 2279 greg_section->size))
b34976b6 2280 return FALSE;
930b4cb2 2281 }
b34976b6 2282 return TRUE;
930b4cb2
HPN		 2283}
2284
f60ebe14 2285/* We need to include the maximum size of PUSHJ-stubs in the initial
eea6121a 2286 section size. This is expected to shrink during linker relaxation. */
f60ebe14
HPN		 2287
2288static void
2289mmix_set_relaxable_size (abfd, sec, ptr)
2290 bfd *abfd ATTRIBUTE_UNUSED;
2291 asection *sec;
2292 void *ptr;
2293{
2294 struct bfd_link_info *info = ptr;
2295
2296 /* Make sure we only do this for section where we know we want this,
2297 otherwise we might end up resetting the size of COMMONs. */
2298 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)
2299 return;
2300
1a23a9e6 2301 sec->rawsize = sec->size;
eea6121a
AM		 2302 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs
2303 * MAX_PUSHJ_STUB_SIZE);
f60ebe14
HPN		 2304
2305 /* For use in relocatable link, we start with a max stubs size. See
2306 mmix_elf_relax_section. */
2307 if (info->relocatable && sec->output_section)
2308 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum
2309 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs
2310 * MAX_PUSHJ_STUB_SIZE);
2311}
2312
930b4cb2
HPN		 2313/* Initialize stuff for the linker-generated GREGs to match
2314 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */
2315
b34976b6 2316bfd_boolean
f60ebe14 2317_bfd_mmix_before_linker_allocation (abfd, info)
930b4cb2
HPN		 2318 bfd *abfd ATTRIBUTE_UNUSED;
2319 struct bfd_link_info *info;
2320{
2321 asection *bpo_gregs_section;
2322 bfd *bpo_greg_owner;
2323 struct bpo_greg_section_info *gregdata;
2324 size_t n_gregs;
2325 bfd_vma gregs_size;
2326 size_t i;
2327 size_t *bpo_reloc_indexes;
f60ebe14
HPN		 2328 bfd *ibfd;
2329
2330 /* Set the initial size of sections. */
2331 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2332 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info);
930b4cb2
HPN		 2333
2334 /* The bpo_greg_owner bfd is supposed to have been set by
2335 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen.
2336 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */
2337 bpo_greg_owner = (bfd *) info->base_file;
2338 if (bpo_greg_owner == NULL)
b34976b6 2339 return TRUE;
930b4cb2
HPN		 2340
2341 bpo_gregs_section
2342 = bfd_get_section_by_name (bpo_greg_owner,
2343 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2344
930b4cb2 2345 if (bpo_gregs_section == NULL)
b34976b6 2346 return TRUE;
930b4cb2
HPN		 2347
2348 /* We use the target-data handle in the ELF section data. */
f0abc2a1 2349 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
930b4cb2 2350 if (gregdata == NULL)
b34976b6 2351 return FALSE;
930b4cb2
HPN		 2352
2353 n_gregs = gregdata->n_bpo_relocs;
2354 gregdata->n_allocated_bpo_gregs = n_gregs;
2355
2356 /* When this reaches zero during relaxation, all entries have been
2357 filled in and the size of the linker gregs can be calculated. */
2358 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs;
2359
2360 /* Set the zeroth-order estimate for the GREGs size. */
2361 gregs_size = n_gregs * 8;
2362
2363 if (!bfd_set_section_size (bpo_greg_owner, bpo_gregs_section, gregs_size))
b34976b6 2364 return FALSE;
930b4cb2
HPN		 2365
2366 /* Allocate and set up the GREG arrays. They're filled in at relaxation
2367 time. Note that we must use the max number ever noted for the array,
2368 since the index numbers were created before GC. */
2369 gregdata->reloc_request
2370 = bfd_zalloc (bpo_greg_owner,
2371 sizeof (struct bpo_reloc_request)
2372 * gregdata->n_max_bpo_relocs);
2373
2374 gregdata->bpo_reloc_indexes
2375 = bpo_reloc_indexes
2376 = bfd_alloc (bpo_greg_owner,
2377 gregdata->n_max_bpo_relocs
2378 * sizeof (size_t));
2379 if (bpo_reloc_indexes == NULL)
b34976b6 2380 return FALSE;
930b4cb2
HPN		 2381
2382 /* The default order is an identity mapping. */
2383 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2384 {
2385 bpo_reloc_indexes[i] = i;
2386 gregdata->reloc_request[i].bpo_reloc_no = i;
2387 }
2388
b34976b6 2389 return TRUE;
3c3bdf30 2390}
e06fcc86 2391\f
930b4cb2
HPN		 2392/* Fill in contents in the linker allocated gregs. Everything is
2393 calculated at this point; we just move the contents into place here. */
2394
b34976b6 2395bfd_boolean
f60ebe14 2396_bfd_mmix_after_linker_allocation (abfd, link_info)
930b4cb2
HPN		 2397 bfd *abfd ATTRIBUTE_UNUSED;
2398 struct bfd_link_info *link_info;
2399{
2400 asection *bpo_gregs_section;
2401 bfd *bpo_greg_owner;
2402 struct bpo_greg_section_info *gregdata;
2403 size_t n_gregs;
2404 size_t i, j;
2405 size_t lastreg;
2406 bfd_byte *contents;
2407
2408 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs
2409 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such
2410 object, there was no R_MMIX_BASE_PLUS_OFFSET. */
2411 bpo_greg_owner = (bfd *) link_info->base_file;
2412 if (bpo_greg_owner == NULL)
b34976b6 2413 return TRUE;
930b4cb2
HPN		 2414
2415 bpo_gregs_section
2416 = bfd_get_section_by_name (bpo_greg_owner,
2417 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2418
2419 /* This can't happen without DSO handling. When DSOs are handled
2420 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such
2421 section. */
2422 if (bpo_gregs_section == NULL)
b34976b6 2423 return TRUE;
930b4cb2
HPN		 2424
2425 /* We use the target-data handle in the ELF section data. */
2426
f0abc2a1 2427 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
930b4cb2 2428 if (gregdata == NULL)
b34976b6 2429 return FALSE;
930b4cb2
HPN		 2430
2431 n_gregs = gregdata->n_allocated_bpo_gregs;
2432
2433 bpo_gregs_section->contents
eea6121a 2434 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size);
930b4cb2 2435 if (contents == NULL)
b34976b6 2436 return FALSE;
930b4cb2 2437
7e799044
HPN		 2438 /* Sanity check: If these numbers mismatch, some relocation has not been
2439 accounted for and the rest of gregdata is probably inconsistent.
2440 It's a bug, but it's more helpful to identify it than segfaulting
2441 below. */
2442 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round
2443 != gregdata->n_bpo_relocs)
2444 {
2445 (*_bfd_error_handler)
2446 (_("Internal inconsistency: remaining %u != max %u.\n\
2447 Please report this bug."),
2448 gregdata->n_remaining_bpo_relocs_this_relaxation_round,
2449 gregdata->n_bpo_relocs);
b34976b6 2450 return FALSE;
7e799044
HPN		 2451 }
2452
930b4cb2
HPN		 2453 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++)
2454 if (gregdata->reloc_request[i].regindex != lastreg)
2455 {
2456 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value,
2457 contents + j * 8);
2458 lastreg = gregdata->reloc_request[i].regindex;
2459 j++;
2460 }
2461
b34976b6 2462 return TRUE;
930b4cb2
HPN		 2463}
2464
2465/* Sort valid relocs to come before non-valid relocs, then on increasing
2466 value. */
2467
2468static int
2469bpo_reloc_request_sort_fn (p1, p2)
2470 const PTR p1;
2471 const PTR p2;
2472{
2473 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1;
2474 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2;
2475
2476 /* Primary function is validity; non-valid relocs sorted after valid
2477 ones. */
2478 if (r1->valid != r2->valid)
2479 return r2->valid - r1->valid;
2480
4fa5c2a8
HPN		 2481 /* Then sort on value. Don't simplify and return just the difference of
2482 the values: the upper bits of the 64-bit value would be truncated on
2483 a host with 32-bit ints. */
930b4cb2 2484 if (r1->value != r2->value)
4fa5c2a8 2485 return r1->value > r2->value ? 1 : -1;
930b4cb2 2486
dfbbae4c
HPN		 2487 /* As a last re-sort, use the relocation number, so we get a stable
2488 sort. The *addresses* aren't stable since items are swapped during
2489 sorting. It depends on the qsort implementation if this actually
2490 happens. */
2491 return r1->bpo_reloc_no > r2->bpo_reloc_no
2492 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0);
930b4cb2
HPN		 2493}
2494
4fa5c2a8
HPN		 2495/* For debug use only. Dumps the global register allocations resulting
2496 from base-plus-offset relocs. */
2497
2498void
2499mmix_dump_bpo_gregs (link_info, pf)
2500 struct bfd_link_info *link_info;
2501 bfd_error_handler_type pf;
2502{
2503 bfd *bpo_greg_owner;
2504 asection *bpo_gregs_section;
2505 struct bpo_greg_section_info *gregdata;
2506 unsigned int i;
2507
2508 if (link_info == NULL || link_info->base_file == NULL)
2509 return;
2510
2511 bpo_greg_owner = (bfd *) link_info->base_file;
2512
2513 bpo_gregs_section
2514 = bfd_get_section_by_name (bpo_greg_owner,
2515 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
2516
2517 if (bpo_gregs_section == NULL)
2518 return;
2519
f0abc2a1 2520 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
4fa5c2a8
HPN		 2521 if (gregdata == NULL)
2522 return;
2523
2524 if (pf == NULL)
2525 pf = _bfd_error_handler;
2526
2527 /* These format strings are not translated. They are for debug purposes
2528 only and never displayed to an end user. Should they escape, we
2529 surely want them in original. */
2530 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\
2531 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs,
2532 gregdata->n_max_bpo_relocs,
2533 gregdata->n_remaining_bpo_relocs_this_relaxation_round,
2534 gregdata->n_allocated_bpo_gregs);
2535
2536 if (gregdata->reloc_request)
2537 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2538 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n",
2539 i,
cf3d882d
AM		 2540 (gregdata->bpo_reloc_indexes != NULL
2541 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1),
4fa5c2a8
HPN		 2542 gregdata->reloc_request[i].bpo_reloc_no,
2543 gregdata->reloc_request[i].valid,
2544
2545 (unsigned long) (gregdata->reloc_request[i].value >> 32),
2546 (unsigned long) gregdata->reloc_request[i].value,
2547 gregdata->reloc_request[i].regindex,
2548 gregdata->reloc_request[i].offset);
2549}
2550
930b4cb2
HPN		 2551/* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and
2552 when the last such reloc is done, an index-array is sorted according to
2553 the values and iterated over to produce register numbers (indexed by 0
2554 from the first allocated register number) and offsets for use in real
2555 relocation.
2556
f60ebe14
HPN		 2557 PUSHJ stub accounting is also done here.
2558
930b4cb2
HPN		 2559 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
2560
b34976b6 2561static bfd_boolean
930b4cb2
HPN		 2562mmix_elf_relax_section (abfd, sec, link_info, again)
2563 bfd *abfd;
2564 asection *sec;
2565 struct bfd_link_info *link_info;
b34976b6 2566 bfd_boolean *again;
930b4cb2 2567{
930b4cb2 2568 Elf_Internal_Shdr *symtab_hdr;
930b4cb2 2569 Elf_Internal_Rela *internal_relocs;
930b4cb2
HPN		 2570 Elf_Internal_Rela *irel, *irelend;
2571 asection *bpo_gregs_section = NULL;
2572 struct bpo_greg_section_info *gregdata;
2573 struct bpo_reloc_section_info *bpodata
f0abc2a1 2574 = mmix_elf_section_data (sec)->bpo.reloc;
f60ebe14
HPN		 2575 /* The initialization is to quiet compiler warnings. The value is to
2576 spot a missing actual initialization. */
2577 size_t bpono = (size_t) -1;
2578 size_t pjsno = 0;
930b4cb2 2579 bfd *bpo_greg_owner;
6cdc0ccc 2580 Elf_Internal_Sym *isymbuf = NULL;
1a23a9e6 2581 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size;
f60ebe14
HPN		 2582
2583 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0;
930b4cb2
HPN		 2584
2585 /* Assume nothing changes. */
b34976b6 2586 *again = FALSE;
930b4cb2 2587
f60ebe14
HPN		 2588 /* We don't have to do anything if this section does not have relocs, or
2589 if this is not a code section. */
2590 if ((sec->flags & SEC_RELOC) == 0
930b4cb2
HPN		 2591 || sec->reloc_count == 0
2592 || (sec->flags & SEC_CODE) == 0
2593 || (sec->flags & SEC_LINKER_CREATED) != 0
f60ebe14
HPN		 2594 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs,
2595 then nothing to do. */
2596 || (bpodata == NULL
2597 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0))
b34976b6 2598 return TRUE;
930b4cb2
HPN		 2599
2600 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
930b4cb2
HPN		 2601
2602 bpo_greg_owner = (bfd *) link_info->base_file;
930b4cb2 2603
f60ebe14
HPN		 2604 if (bpodata != NULL)
2605 {
2606 bpo_gregs_section = bpodata->bpo_greg_section;
2607 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
2608 bpono = bpodata->first_base_plus_offset_reloc;
2609 }
2610 else
2611 gregdata = NULL;
930b4cb2
HPN		 2612
2613 /* Get a copy of the native relocations. */
2614 internal_relocs
45d6a902
AM		 2615 = _bfd_elf_link_read_relocs (abfd, sec, (PTR) NULL,
2616 (Elf_Internal_Rela *) NULL,
2617 link_info->keep_memory);
930b4cb2
HPN		 2618 if (internal_relocs == NULL)
2619 goto error_return;
930b4cb2
HPN		 2620
2621 /* Walk through them looking for relaxing opportunities. */
2622 irelend = internal_relocs + sec->reloc_count;
2623 for (irel = internal_relocs; irel < irelend; irel++)
2624 {
2625 bfd_vma symval;
f60ebe14 2626 struct elf_link_hash_entry *h = NULL;
930b4cb2 2627
f60ebe14
HPN		 2628 /* We only process two relocs. */
2629 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET
2630 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE)
930b4cb2
HPN		 2631 continue;
2632
f60ebe14
HPN		 2633 /* We process relocs in a distinctly different way when this is a
2634 relocatable link (for one, we don't look at symbols), so we avoid
2635 mixing its code with that for the "normal" relaxation. */
2636 if (link_info->relocatable)
2637 {
2638 /* The only transformation in a relocatable link is to generate
2639 a full stub at the location of the stub calculated for the
2640 input section, if the relocated stub location, the end of the
2641 output section plus earlier stubs, cannot be reached. Thus
2642 relocatable linking can only lead to worse code, but it still
2643 works. */
2644 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE)
2645 {
2646 /* If we can reach the end of the output-section and beyond
2647 any current stubs, then we don't need a stub for this
2648 reloc. The relaxed order of output stub allocation may
2649 not exactly match the straightforward order, so we always
2650 assume presence of output stubs, which will allow
2651 relaxation only on relocations indifferent to the
2652 presence of output stub allocations for other relocations
2653 and thus the order of output stub allocation. */
2654 if (bfd_check_overflow (complain_overflow_signed,
2655 19,
2656 0,
2657 bfd_arch_bits_per_address (abfd),
2658 /* Output-stub location. */
1a23a9e6 2659 sec->output_section->rawsize
f60ebe14
HPN		 2660 + (mmix_elf_section_data (sec
2661 ->output_section)
2662 ->pjs.stubs_size_sum)
2663 /* Location of this PUSHJ reloc. */
2664 - (sec->output_offset + irel->r_offset)
2665 /* Don't count *this* stub twice. */
2666 - (mmix_elf_section_data (sec)
2667 ->pjs.stub_size[pjsno]
2668 + MAX_PUSHJ_STUB_SIZE))
2669 == bfd_reloc_ok)
2670 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0;
2671
2672 mmix_elf_section_data (sec)->pjs.stubs_size_sum
2673 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno];
2674
2675 pjsno++;
2676 }
2677
2678 continue;
2679 }
2680
930b4cb2
HPN		 2681 /* Get the value of the symbol referred to by the reloc. */
2682 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2683 {
2684 /* A local symbol. */
6cdc0ccc 2685 Elf_Internal_Sym *isym;
930b4cb2
HPN		 2686 asection *sym_sec;
2687
6cdc0ccc
AM		 2688 /* Read this BFD's local symbols if we haven't already. */
2689 if (isymbuf == NULL)
2690 {
2691 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2692 if (isymbuf == NULL)
2693 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2694 symtab_hdr->sh_info, 0,
2695 NULL, NULL, NULL);
2696 if (isymbuf == 0)
2697 goto error_return;
2698 }
930b4cb2 2699
6cdc0ccc
AM		 2700 isym = isymbuf + ELF64_R_SYM (irel->r_info);
2701 if (isym->st_shndx == SHN_UNDEF)
930b4cb2 2702 sym_sec = bfd_und_section_ptr;
6cdc0ccc 2703 else if (isym->st_shndx == SHN_ABS)
930b4cb2 2704 sym_sec = bfd_abs_section_ptr;
6cdc0ccc 2705 else if (isym->st_shndx == SHN_COMMON)
930b4cb2
HPN		 2706 sym_sec = bfd_com_section_ptr;
2707 else
6cdc0ccc
AM		 2708 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2709 symval = (isym->st_value
930b4cb2
HPN		 2710 + sym_sec->output_section->vma
2711 + sym_sec->output_offset);
2712 }
2713 else
2714 {
2715 unsigned long indx;
930b4cb2
HPN		 2716
2717 /* An external symbol. */
2718 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2719 h = elf_sym_hashes (abfd)[indx];
2720 BFD_ASSERT (h != NULL);
2721 if (h->root.type != bfd_link_hash_defined
2722 && h->root.type != bfd_link_hash_defweak)
2723 {
f60ebe14
HPN		 2724 /* This appears to be a reference to an undefined symbol. Just
2725 ignore it--it will be caught by the regular reloc processing.
2726 We need to keep BPO reloc accounting consistent, though
2727 else we'll abort instead of emitting an error message. */
2728 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET
2729 && gregdata != NULL)
2730 {
2731 gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
2732 bpono++;
2733 }
930b4cb2
HPN		 2734 continue;
2735 }
2736
2737 symval = (h->root.u.def.value
2738 + h->root.u.def.section->output_section->vma
2739 + h->root.u.def.section->output_offset);
2740 }
2741
f60ebe14
HPN		 2742 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE)
2743 {
2744 bfd_vma value = symval + irel->r_addend;
2745 bfd_vma dot
2746 = (sec->output_section->vma
2747 + sec->output_offset
2748 + irel->r_offset);
2749 bfd_vma stubaddr
2750 = (sec->output_section->vma
2751 + sec->output_offset
eea6121a 2752 + size
f60ebe14
HPN		 2753 + mmix_elf_section_data (sec)->pjs.stubs_size_sum);
2754
2755 if ((value & 3) == 0
2756 && bfd_check_overflow (complain_overflow_signed,
2757 19,
2758 0,
2759 bfd_arch_bits_per_address (abfd),
2760 value - dot
2761 - (value > dot
2762 ? mmix_elf_section_data (sec)
2763 ->pjs.stub_size[pjsno]
2764 : 0))
2765 == bfd_reloc_ok)
2766 /* If the reloc fits, no stub is needed. */
2767 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0;
2768 else
2769 /* Maybe we can get away with just a JMP insn? */
2770 if ((value & 3) == 0
2771 && bfd_check_overflow (complain_overflow_signed,
2772 27,
2773 0,
2774 bfd_arch_bits_per_address (abfd),
2775 value - stubaddr
2776 - (value > dot
2777 ? mmix_elf_section_data (sec)
2778 ->pjs.stub_size[pjsno] - 4
2779 : 0))
2780 == bfd_reloc_ok)
2781 /* Yep, account for a stub consisting of a single JMP insn. */
2782 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4;
2783 else
2784 /* Nope, go for the full insn stub. It doesn't seem useful to
2785 emit the intermediate sizes; those will only be useful for
2786 a >64M program assuming contiguous code. */
2787 mmix_elf_section_data (sec)->pjs.stub_size[pjsno]
2788 = MAX_PUSHJ_STUB_SIZE;
2789
2790 mmix_elf_section_data (sec)->pjs.stubs_size_sum
2791 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno];
2792 pjsno++;
2793 continue;
2794 }
2795
2796 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */
2797
930b4cb2
HPN		 2798 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value
2799 = symval + irel->r_addend;
b34976b6 2800 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE;
930b4cb2
HPN		 2801 gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
2802 }
2803
2804 /* Check if that was the last BPO-reloc. If so, sort the values and
2805 calculate how many registers we need to cover them. Set the size of
2806 the linker gregs, and if the number of registers changed, indicate
2807 that we need to relax some more because we have more work to do. */
f60ebe14
HPN		 2808 if (gregdata != NULL
2809 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0)
930b4cb2
HPN		 2810 {
2811 size_t i;
2812 bfd_vma prev_base;
2813 size_t regindex;
2814
2815 /* First, reset the remaining relocs for the next round. */
2816 gregdata->n_remaining_bpo_relocs_this_relaxation_round
2817 = gregdata->n_bpo_relocs;
2818
2819 qsort ((PTR) gregdata->reloc_request,
2820 gregdata->n_max_bpo_relocs,
2821 sizeof (struct bpo_reloc_request),
2822 bpo_reloc_request_sort_fn);
2823
2824 /* Recalculate indexes. When we find a change (however unlikely
2825 after the initial iteration), we know we need to relax again,
2826 since items in the GREG-array are sorted by increasing value and
2827 stored in the relaxation phase. */
2828 for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
2829 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
2830 != i)
2831 {
2832 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
2833 = i;
b34976b6 2834 *again = TRUE;
930b4cb2
HPN		 2835 }
2836
2837 /* Allocate register numbers (indexing from 0). Stop at the first
2838 non-valid reloc. */
2839 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value;
2840 i < gregdata->n_bpo_relocs;
2841 i++)
2842 {
2843 if (gregdata->reloc_request[i].value > prev_base + 255)
2844 {
2845 regindex++;
2846 prev_base = gregdata->reloc_request[i].value;
2847 }
2848 gregdata->reloc_request[i].regindex = regindex;
2849 gregdata->reloc_request[i].offset
2850 = gregdata->reloc_request[i].value - prev_base;
2851 }
2852
2853 /* If it's not the same as the last time, we need to relax again,
2854 because the size of the section has changed. I'm not sure we
2855 actually need to do any adjustments since the shrinking happens
2856 at the start of this section, but better safe than sorry. */
2857 if (gregdata->n_allocated_bpo_gregs != regindex + 1)
2858 {
2859 gregdata->n_allocated_bpo_gregs = regindex + 1;
b34976b6 2860 *again = TRUE;
930b4cb2
HPN		 2861 }
2862
eea6121a 2863 bpo_gregs_section->size = (regindex + 1) * 8;
930b4cb2
HPN		 2864 }
2865
6cdc0ccc 2866 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
930b4cb2
HPN		 2867 {
2868 if (! link_info->keep_memory)
6cdc0ccc
AM		 2869 free (isymbuf);
2870 else
930b4cb2 2871 {
6cdc0ccc
AM		 2872 /* Cache the symbols for elf_link_input_bfd. */
2873 symtab_hdr->contents = (unsigned char *) isymbuf;
930b4cb2
HPN		 2874 }
2875 }
2876
6cdc0ccc
AM		 2877 if (internal_relocs != NULL
2878 && elf_section_data (sec)->relocs != internal_relocs)
2879 free (internal_relocs);
2880
eea6121a 2881 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum)
f60ebe14
HPN		 2882 abort ();
2883
eea6121a 2884 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum)
f60ebe14 2885 {
eea6121a 2886 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum;
f60ebe14
HPN		 2887 *again = TRUE;
2888 }
2889
b34976b6 2890 return TRUE;
930b4cb2
HPN		 2891
2892 error_return:
6cdc0ccc
AM		 2893 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
2894 free (isymbuf);
2895 if (internal_relocs != NULL
2896 && elf_section_data (sec)->relocs != internal_relocs)
2897 free (internal_relocs);
b34976b6 2898 return FALSE;
930b4cb2
HPN		 2899}
2900\f
3c3bdf30
NC		 2901#define ELF_ARCH bfd_arch_mmix
2902#define ELF_MACHINE_CODE EM_MMIX
2903
2904/* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL).
2905 However, that's too much for something somewhere in the linker part of
2906 BFD; perhaps the start-address has to be a non-zero multiple of this
2907 number, or larger than this number. The symptom is that the linker
2908 complains: "warning: allocated section `.text' not in segment". We
2909 settle for 64k; the page-size used in examples is 8k.
2910 #define ELF_MAXPAGESIZE 0x10000
2911
2912 Unfortunately, this causes excessive padding in the supposedly small
2913 for-education programs that are the expected usage (where people would
2914 inspect output). We stick to 256 bytes just to have *some* default
2915 alignment. */
2916#define ELF_MAXPAGESIZE 0x100
2917
2918#define TARGET_BIG_SYM bfd_elf64_mmix_vec
2919#define TARGET_BIG_NAME "elf64-mmix"
2920
2921#define elf_info_to_howto_rel NULL
2922#define elf_info_to_howto mmix_info_to_howto_rela
2923#define elf_backend_relocate_section mmix_elf_relocate_section
2924#define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook
930b4cb2
HPN		 2925#define elf_backend_gc_sweep_hook mmix_elf_gc_sweep_hook
2926
3c3bdf30
NC		 2927#define elf_backend_link_output_symbol_hook \
2928 mmix_elf_link_output_symbol_hook
2929#define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook
2930
2931#define elf_backend_check_relocs mmix_elf_check_relocs
2932#define elf_backend_symbol_processing mmix_elf_symbol_processing
2933
2934#define bfd_elf64_bfd_is_local_label_name \
2935 mmix_elf_is_local_label_name
2936
2937#define elf_backend_may_use_rel_p 0
2938#define elf_backend_may_use_rela_p 1
2939#define elf_backend_default_use_rela_p 1
2940
2941#define elf_backend_can_gc_sections 1
2942#define elf_backend_section_from_bfd_section \
2943 mmix_elf_section_from_bfd_section
2944
f0abc2a1 2945#define bfd_elf64_new_section_hook mmix_elf_new_section_hook
3c3bdf30 2946#define bfd_elf64_bfd_final_link mmix_elf_final_link
930b4cb2 2947#define bfd_elf64_bfd_relax_section mmix_elf_relax_section
3c3bdf30
NC		 2948
2949#include "elf64-target.h"
GDB Binutils - Deliverables
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