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* ld-mn10300/mn10300.exp: Fix the start address of the .bss section for the i1127740...
[deliverable/binutils-gdb.git] / bfd / elf-m10300.c
1 /* Matsushita 10300 specific support for 32-bit ELF
2 Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
3 2006, 2007 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/mn10300.h"
27 #include "libiberty.h"
28
29 /* The mn10300 linker needs to keep track of the number of relocs that
30 it decides to copy in check_relocs for each symbol. This is so
31 that it can discard PC relative relocs if it doesn't need them when
32 linking with -Bsymbolic. We store the information in a field
33 extending the regular ELF linker hash table. */
34
35 struct elf32_mn10300_link_hash_entry
36 {
37 /* The basic elf link hash table entry. */
38 struct elf_link_hash_entry root;
39
40 /* For function symbols, the number of times this function is
41 called directly (ie by name). */
42 unsigned int direct_calls;
43
44 /* For function symbols, the size of this function's stack
45 (if <= 255 bytes). We stuff this into "call" instructions
46 to this target when it's valid and profitable to do so.
47
48 This does not include stack allocated by movm! */
49 unsigned char stack_size;
50
51 /* For function symbols, arguments (if any) for movm instruction
52 in the prologue. We stuff this value into "call" instructions
53 to the target when it's valid and profitable to do so. */
54 unsigned char movm_args;
55
56 /* For function symbols, the amount of stack space that would be allocated
57 by the movm instruction. This is redundant with movm_args, but we
58 add it to the hash table to avoid computing it over and over. */
59 unsigned char movm_stack_size;
60
61 /* When set, convert all "call" instructions to this target into "calls"
62 instructions. */
63 #define MN10300_CONVERT_CALL_TO_CALLS 0x1
64
65 /* Used to mark functions which have had redundant parts of their
66 prologue deleted. */
67 #define MN10300_DELETED_PROLOGUE_BYTES 0x2
68 unsigned char flags;
69
70 /* Calculated value. */
71 bfd_vma value;
72 };
73
74 /* We derive a hash table from the main elf linker hash table so
75 we can store state variables and a secondary hash table without
76 resorting to global variables. */
77 struct elf32_mn10300_link_hash_table
78 {
79 /* The main hash table. */
80 struct elf_link_hash_table root;
81
82 /* A hash table for static functions. We could derive a new hash table
83 instead of using the full elf32_mn10300_link_hash_table if we wanted
84 to save some memory. */
85 struct elf32_mn10300_link_hash_table *static_hash_table;
86
87 /* Random linker state flags. */
88 #define MN10300_HASH_ENTRIES_INITIALIZED 0x1
89 char flags;
90 };
91
92 #ifndef streq
93 #define streq(a, b) (strcmp ((a),(b)) == 0)
94 #endif
95
96 /* For MN10300 linker hash table. */
97
98 /* Get the MN10300 ELF linker hash table from a link_info structure. */
99
100 #define elf32_mn10300_hash_table(p) \
101 ((struct elf32_mn10300_link_hash_table *) ((p)->hash))
102
103 #define elf32_mn10300_link_hash_traverse(table, func, info) \
104 (elf_link_hash_traverse \
105 (&(table)->root, \
106 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \
107 (info)))
108
109 static reloc_howto_type elf_mn10300_howto_table[] =
110 {
111 /* Dummy relocation. Does nothing. */
112 HOWTO (R_MN10300_NONE,
113 0,
114 2,
115 16,
116 FALSE,
117 0,
118 complain_overflow_bitfield,
119 bfd_elf_generic_reloc,
120 "R_MN10300_NONE",
121 FALSE,
122 0,
123 0,
124 FALSE),
125 /* Standard 32 bit reloc. */
126 HOWTO (R_MN10300_32,
127 0,
128 2,
129 32,
130 FALSE,
131 0,
132 complain_overflow_bitfield,
133 bfd_elf_generic_reloc,
134 "R_MN10300_32",
135 FALSE,
136 0xffffffff,
137 0xffffffff,
138 FALSE),
139 /* Standard 16 bit reloc. */
140 HOWTO (R_MN10300_16,
141 0,
142 1,
143 16,
144 FALSE,
145 0,
146 complain_overflow_bitfield,
147 bfd_elf_generic_reloc,
148 "R_MN10300_16",
149 FALSE,
150 0xffff,
151 0xffff,
152 FALSE),
153 /* Standard 8 bit reloc. */
154 HOWTO (R_MN10300_8,
155 0,
156 0,
157 8,
158 FALSE,
159 0,
160 complain_overflow_bitfield,
161 bfd_elf_generic_reloc,
162 "R_MN10300_8",
163 FALSE,
164 0xff,
165 0xff,
166 FALSE),
167 /* Standard 32bit pc-relative reloc. */
168 HOWTO (R_MN10300_PCREL32,
169 0,
170 2,
171 32,
172 TRUE,
173 0,
174 complain_overflow_bitfield,
175 bfd_elf_generic_reloc,
176 "R_MN10300_PCREL32",
177 FALSE,
178 0xffffffff,
179 0xffffffff,
180 TRUE),
181 /* Standard 16bit pc-relative reloc. */
182 HOWTO (R_MN10300_PCREL16,
183 0,
184 1,
185 16,
186 TRUE,
187 0,
188 complain_overflow_bitfield,
189 bfd_elf_generic_reloc,
190 "R_MN10300_PCREL16",
191 FALSE,
192 0xffff,
193 0xffff,
194 TRUE),
195 /* Standard 8 pc-relative reloc. */
196 HOWTO (R_MN10300_PCREL8,
197 0,
198 0,
199 8,
200 TRUE,
201 0,
202 complain_overflow_bitfield,
203 bfd_elf_generic_reloc,
204 "R_MN10300_PCREL8",
205 FALSE,
206 0xff,
207 0xff,
208 TRUE),
209
210 /* GNU extension to record C++ vtable hierarchy. */
211 HOWTO (R_MN10300_GNU_VTINHERIT, /* type */
212 0, /* rightshift */
213 0, /* size (0 = byte, 1 = short, 2 = long) */
214 0, /* bitsize */
215 FALSE, /* pc_relative */
216 0, /* bitpos */
217 complain_overflow_dont, /* complain_on_overflow */
218 NULL, /* special_function */
219 "R_MN10300_GNU_VTINHERIT", /* name */
220 FALSE, /* partial_inplace */
221 0, /* src_mask */
222 0, /* dst_mask */
223 FALSE), /* pcrel_offset */
224
225 /* GNU extension to record C++ vtable member usage */
226 HOWTO (R_MN10300_GNU_VTENTRY, /* type */
227 0, /* rightshift */
228 0, /* size (0 = byte, 1 = short, 2 = long) */
229 0, /* bitsize */
230 FALSE, /* pc_relative */
231 0, /* bitpos */
232 complain_overflow_dont, /* complain_on_overflow */
233 NULL, /* special_function */
234 "R_MN10300_GNU_VTENTRY", /* name */
235 FALSE, /* partial_inplace */
236 0, /* src_mask */
237 0, /* dst_mask */
238 FALSE), /* pcrel_offset */
239
240 /* Standard 24 bit reloc. */
241 HOWTO (R_MN10300_24,
242 0,
243 2,
244 24,
245 FALSE,
246 0,
247 complain_overflow_bitfield,
248 bfd_elf_generic_reloc,
249 "R_MN10300_24",
250 FALSE,
251 0xffffff,
252 0xffffff,
253 FALSE),
254 HOWTO (R_MN10300_GOTPC32, /* type */
255 0, /* rightshift */
256 2, /* size (0 = byte, 1 = short, 2 = long) */
257 32, /* bitsize */
258 TRUE, /* pc_relative */
259 0, /* bitpos */
260 complain_overflow_bitfield, /* complain_on_overflow */
261 bfd_elf_generic_reloc, /* */
262 "R_MN10300_GOTPC32", /* name */
263 FALSE, /* partial_inplace */
264 0xffffffff, /* src_mask */
265 0xffffffff, /* dst_mask */
266 TRUE), /* pcrel_offset */
267
268 HOWTO (R_MN10300_GOTPC16, /* type */
269 0, /* rightshift */
270 1, /* size (0 = byte, 1 = short, 2 = long) */
271 16, /* bitsize */
272 TRUE, /* pc_relative */
273 0, /* bitpos */
274 complain_overflow_bitfield, /* complain_on_overflow */
275 bfd_elf_generic_reloc, /* */
276 "R_MN10300_GOTPC16", /* name */
277 FALSE, /* partial_inplace */
278 0xffff, /* src_mask */
279 0xffff, /* dst_mask */
280 TRUE), /* pcrel_offset */
281
282 HOWTO (R_MN10300_GOTOFF32, /* type */
283 0, /* rightshift */
284 2, /* size (0 = byte, 1 = short, 2 = long) */
285 32, /* bitsize */
286 FALSE, /* pc_relative */
287 0, /* bitpos */
288 complain_overflow_bitfield, /* complain_on_overflow */
289 bfd_elf_generic_reloc, /* */
290 "R_MN10300_GOTOFF32", /* name */
291 FALSE, /* partial_inplace */
292 0xffffffff, /* src_mask */
293 0xffffffff, /* dst_mask */
294 FALSE), /* pcrel_offset */
295
296 HOWTO (R_MN10300_GOTOFF24, /* type */
297 0, /* rightshift */
298 2, /* size (0 = byte, 1 = short, 2 = long) */
299 24, /* bitsize */
300 FALSE, /* pc_relative */
301 0, /* bitpos */
302 complain_overflow_bitfield, /* complain_on_overflow */
303 bfd_elf_generic_reloc, /* */
304 "R_MN10300_GOTOFF24", /* name */
305 FALSE, /* partial_inplace */
306 0xffffff, /* src_mask */
307 0xffffff, /* dst_mask */
308 FALSE), /* pcrel_offset */
309
310 HOWTO (R_MN10300_GOTOFF16, /* type */
311 0, /* rightshift */
312 1, /* size (0 = byte, 1 = short, 2 = long) */
313 16, /* bitsize */
314 FALSE, /* pc_relative */
315 0, /* bitpos */
316 complain_overflow_bitfield, /* complain_on_overflow */
317 bfd_elf_generic_reloc, /* */
318 "R_MN10300_GOTOFF16", /* name */
319 FALSE, /* partial_inplace */
320 0xffff, /* src_mask */
321 0xffff, /* dst_mask */
322 FALSE), /* pcrel_offset */
323
324 HOWTO (R_MN10300_PLT32, /* type */
325 0, /* rightshift */
326 2, /* size (0 = byte, 1 = short, 2 = long) */
327 32, /* bitsize */
328 TRUE, /* pc_relative */
329 0, /* bitpos */
330 complain_overflow_bitfield, /* complain_on_overflow */
331 bfd_elf_generic_reloc, /* */
332 "R_MN10300_PLT32", /* name */
333 FALSE, /* partial_inplace */
334 0xffffffff, /* src_mask */
335 0xffffffff, /* dst_mask */
336 TRUE), /* pcrel_offset */
337
338 HOWTO (R_MN10300_PLT16, /* type */
339 0, /* rightshift */
340 1, /* size (0 = byte, 1 = short, 2 = long) */
341 16, /* bitsize */
342 TRUE, /* pc_relative */
343 0, /* bitpos */
344 complain_overflow_bitfield, /* complain_on_overflow */
345 bfd_elf_generic_reloc, /* */
346 "R_MN10300_PLT16", /* name */
347 FALSE, /* partial_inplace */
348 0xffff, /* src_mask */
349 0xffff, /* dst_mask */
350 TRUE), /* pcrel_offset */
351
352 HOWTO (R_MN10300_GOT32, /* type */
353 0, /* rightshift */
354 2, /* size (0 = byte, 1 = short, 2 = long) */
355 32, /* bitsize */
356 FALSE, /* pc_relative */
357 0, /* bitpos */
358 complain_overflow_bitfield, /* complain_on_overflow */
359 bfd_elf_generic_reloc, /* */
360 "R_MN10300_GOT32", /* name */
361 FALSE, /* partial_inplace */
362 0xffffffff, /* src_mask */
363 0xffffffff, /* dst_mask */
364 FALSE), /* pcrel_offset */
365
366 HOWTO (R_MN10300_GOT24, /* type */
367 0, /* rightshift */
368 2, /* size (0 = byte, 1 = short, 2 = long) */
369 24, /* bitsize */
370 FALSE, /* pc_relative */
371 0, /* bitpos */
372 complain_overflow_bitfield, /* complain_on_overflow */
373 bfd_elf_generic_reloc, /* */
374 "R_MN10300_GOT24", /* name */
375 FALSE, /* partial_inplace */
376 0xffffffff, /* src_mask */
377 0xffffffff, /* dst_mask */
378 FALSE), /* pcrel_offset */
379
380 HOWTO (R_MN10300_GOT16, /* type */
381 0, /* rightshift */
382 1, /* size (0 = byte, 1 = short, 2 = long) */
383 16, /* bitsize */
384 FALSE, /* pc_relative */
385 0, /* bitpos */
386 complain_overflow_bitfield, /* complain_on_overflow */
387 bfd_elf_generic_reloc, /* */
388 "R_MN10300_GOT16", /* name */
389 FALSE, /* partial_inplace */
390 0xffffffff, /* src_mask */
391 0xffffffff, /* dst_mask */
392 FALSE), /* pcrel_offset */
393
394 HOWTO (R_MN10300_COPY, /* type */
395 0, /* rightshift */
396 2, /* size (0 = byte, 1 = short, 2 = long) */
397 32, /* bitsize */
398 FALSE, /* pc_relative */
399 0, /* bitpos */
400 complain_overflow_bitfield, /* complain_on_overflow */
401 bfd_elf_generic_reloc, /* */
402 "R_MN10300_COPY", /* name */
403 FALSE, /* partial_inplace */
404 0xffffffff, /* src_mask */
405 0xffffffff, /* dst_mask */
406 FALSE), /* pcrel_offset */
407
408 HOWTO (R_MN10300_GLOB_DAT, /* type */
409 0, /* rightshift */
410 2, /* size (0 = byte, 1 = short, 2 = long) */
411 32, /* bitsize */
412 FALSE, /* pc_relative */
413 0, /* bitpos */
414 complain_overflow_bitfield, /* complain_on_overflow */
415 bfd_elf_generic_reloc, /* */
416 "R_MN10300_GLOB_DAT", /* name */
417 FALSE, /* partial_inplace */
418 0xffffffff, /* src_mask */
419 0xffffffff, /* dst_mask */
420 FALSE), /* pcrel_offset */
421
422 HOWTO (R_MN10300_JMP_SLOT, /* type */
423 0, /* rightshift */
424 2, /* size (0 = byte, 1 = short, 2 = long) */
425 32, /* bitsize */
426 FALSE, /* pc_relative */
427 0, /* bitpos */
428 complain_overflow_bitfield, /* complain_on_overflow */
429 bfd_elf_generic_reloc, /* */
430 "R_MN10300_JMP_SLOT", /* name */
431 FALSE, /* partial_inplace */
432 0xffffffff, /* src_mask */
433 0xffffffff, /* dst_mask */
434 FALSE), /* pcrel_offset */
435
436 HOWTO (R_MN10300_RELATIVE, /* type */
437 0, /* rightshift */
438 2, /* size (0 = byte, 1 = short, 2 = long) */
439 32, /* bitsize */
440 FALSE, /* pc_relative */
441 0, /* bitpos */
442 complain_overflow_bitfield, /* complain_on_overflow */
443 bfd_elf_generic_reloc, /* */
444 "R_MN10300_RELATIVE", /* name */
445 FALSE, /* partial_inplace */
446 0xffffffff, /* src_mask */
447 0xffffffff, /* dst_mask */
448 FALSE), /* pcrel_offset */
449
450 EMPTY_HOWTO (24),
451 EMPTY_HOWTO (25),
452 EMPTY_HOWTO (26),
453 EMPTY_HOWTO (27),
454 EMPTY_HOWTO (28),
455 EMPTY_HOWTO (29),
456 EMPTY_HOWTO (30),
457 EMPTY_HOWTO (31),
458 EMPTY_HOWTO (32),
459
460 HOWTO (R_MN10300_SYM_DIFF, /* type */
461 0, /* rightshift */
462 2, /* size (0 = byte, 1 = short, 2 = long) */
463 32, /* bitsize */
464 FALSE, /* pc_relative */
465 0, /* bitpos */
466 complain_overflow_dont,/* complain_on_overflow */
467 NULL, /* special handler. */
468 "R_MN10300_SYM_DIFF", /* name */
469 FALSE, /* partial_inplace */
470 0xffffffff, /* src_mask */
471 0xffffffff, /* dst_mask */
472 FALSE), /* pcrel_offset */
473
474 HOWTO (R_MN10300_ALIGN, /* type */
475 0, /* rightshift */
476 0, /* size (0 = byte, 1 = short, 2 = long) */
477 32, /* bitsize */
478 FALSE, /* pc_relative */
479 0, /* bitpos */
480 complain_overflow_dont,/* complain_on_overflow */
481 NULL, /* special handler. */
482 "R_MN10300_ALIGN", /* name */
483 FALSE, /* partial_inplace */
484 0, /* src_mask */
485 0, /* dst_mask */
486 FALSE) /* pcrel_offset */
487 };
488
489 struct mn10300_reloc_map
490 {
491 bfd_reloc_code_real_type bfd_reloc_val;
492 unsigned char elf_reloc_val;
493 };
494
495 static const struct mn10300_reloc_map mn10300_reloc_map[] =
496 {
497 { BFD_RELOC_NONE, R_MN10300_NONE, },
498 { BFD_RELOC_32, R_MN10300_32, },
499 { BFD_RELOC_16, R_MN10300_16, },
500 { BFD_RELOC_8, R_MN10300_8, },
501 { BFD_RELOC_32_PCREL, R_MN10300_PCREL32, },
502 { BFD_RELOC_16_PCREL, R_MN10300_PCREL16, },
503 { BFD_RELOC_8_PCREL, R_MN10300_PCREL8, },
504 { BFD_RELOC_24, R_MN10300_24, },
505 { BFD_RELOC_VTABLE_INHERIT, R_MN10300_GNU_VTINHERIT },
506 { BFD_RELOC_VTABLE_ENTRY, R_MN10300_GNU_VTENTRY },
507 { BFD_RELOC_32_GOT_PCREL, R_MN10300_GOTPC32 },
508 { BFD_RELOC_16_GOT_PCREL, R_MN10300_GOTPC16 },
509 { BFD_RELOC_32_GOTOFF, R_MN10300_GOTOFF32 },
510 { BFD_RELOC_MN10300_GOTOFF24, R_MN10300_GOTOFF24 },
511 { BFD_RELOC_16_GOTOFF, R_MN10300_GOTOFF16 },
512 { BFD_RELOC_32_PLT_PCREL, R_MN10300_PLT32 },
513 { BFD_RELOC_16_PLT_PCREL, R_MN10300_PLT16 },
514 { BFD_RELOC_MN10300_GOT32, R_MN10300_GOT32 },
515 { BFD_RELOC_MN10300_GOT24, R_MN10300_GOT24 },
516 { BFD_RELOC_MN10300_GOT16, R_MN10300_GOT16 },
517 { BFD_RELOC_MN10300_COPY, R_MN10300_COPY },
518 { BFD_RELOC_MN10300_GLOB_DAT, R_MN10300_GLOB_DAT },
519 { BFD_RELOC_MN10300_JMP_SLOT, R_MN10300_JMP_SLOT },
520 { BFD_RELOC_MN10300_RELATIVE, R_MN10300_RELATIVE },
521 { BFD_RELOC_MN10300_SYM_DIFF, R_MN10300_SYM_DIFF },
522 { BFD_RELOC_MN10300_ALIGN, R_MN10300_ALIGN }
523 };
524
525 /* Create the GOT section. */
526
527 static bfd_boolean
528 _bfd_mn10300_elf_create_got_section (bfd * abfd,
529 struct bfd_link_info * info)
530 {
531 flagword flags;
532 flagword pltflags;
533 asection * s;
534 struct elf_link_hash_entry * h;
535 const struct elf_backend_data * bed = get_elf_backend_data (abfd);
536 int ptralign;
537
538 /* This function may be called more than once. */
539 if (bfd_get_section_by_name (abfd, ".got") != NULL)
540 return TRUE;
541
542 switch (bed->s->arch_size)
543 {
544 case 32:
545 ptralign = 2;
546 break;
547
548 case 64:
549 ptralign = 3;
550 break;
551
552 default:
553 bfd_set_error (bfd_error_bad_value);
554 return FALSE;
555 }
556
557 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
558 | SEC_LINKER_CREATED);
559
560 pltflags = flags;
561 pltflags |= SEC_CODE;
562 if (bed->plt_not_loaded)
563 pltflags &= ~ (SEC_LOAD | SEC_HAS_CONTENTS);
564 if (bed->plt_readonly)
565 pltflags |= SEC_READONLY;
566
567 s = bfd_make_section_with_flags (abfd, ".plt", pltflags);
568 if (s == NULL
569 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
570 return FALSE;
571
572 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
573 .plt section. */
574 if (bed->want_plt_sym)
575 {
576 h = _bfd_elf_define_linkage_sym (abfd, info, s,
577 "_PROCEDURE_LINKAGE_TABLE_");
578 elf_hash_table (info)->hplt = h;
579 if (h == NULL)
580 return FALSE;
581 }
582
583 s = bfd_make_section_with_flags (abfd, ".got", flags);
584 if (s == NULL
585 || ! bfd_set_section_alignment (abfd, s, ptralign))
586 return FALSE;
587
588 if (bed->want_got_plt)
589 {
590 s = bfd_make_section_with_flags (abfd, ".got.plt", flags);
591 if (s == NULL
592 || ! bfd_set_section_alignment (abfd, s, ptralign))
593 return FALSE;
594 }
595
596 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
597 (or .got.plt) section. We don't do this in the linker script
598 because we don't want to define the symbol if we are not creating
599 a global offset table. */
600 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_GLOBAL_OFFSET_TABLE_");
601 elf_hash_table (info)->hgot = h;
602 if (h == NULL)
603 return FALSE;
604
605 /* The first bit of the global offset table is the header. */
606 s->size += bed->got_header_size;
607
608 return TRUE;
609 }
610
611 static reloc_howto_type *
612 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
613 bfd_reloc_code_real_type code)
614 {
615 unsigned int i;
616
617 for (i = ARRAY_SIZE (mn10300_reloc_map); i--;)
618 if (mn10300_reloc_map[i].bfd_reloc_val == code)
619 return &elf_mn10300_howto_table[mn10300_reloc_map[i].elf_reloc_val];
620
621 return NULL;
622 }
623
624 static reloc_howto_type *
625 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
626 const char *r_name)
627 {
628 unsigned int i;
629
630 for (i = ARRAY_SIZE (elf_mn10300_howto_table); i--;)
631 if (elf_mn10300_howto_table[i].name != NULL
632 && strcasecmp (elf_mn10300_howto_table[i].name, r_name) == 0)
633 return elf_mn10300_howto_table + i;
634
635 return NULL;
636 }
637
638 /* Set the howto pointer for an MN10300 ELF reloc. */
639
640 static void
641 mn10300_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
642 arelent *cache_ptr,
643 Elf_Internal_Rela *dst)
644 {
645 unsigned int r_type;
646
647 r_type = ELF32_R_TYPE (dst->r_info);
648 BFD_ASSERT (r_type < (unsigned int) R_MN10300_MAX);
649 cache_ptr->howto = elf_mn10300_howto_table + r_type;
650 }
651
652 /* Look through the relocs for a section during the first phase.
653 Since we don't do .gots or .plts, we just need to consider the
654 virtual table relocs for gc. */
655
656 static bfd_boolean
657 mn10300_elf_check_relocs (bfd *abfd,
658 struct bfd_link_info *info,
659 asection *sec,
660 const Elf_Internal_Rela *relocs)
661 {
662 bfd_boolean sym_diff_reloc_seen;
663 Elf_Internal_Shdr *symtab_hdr;
664 Elf_Internal_Sym * isymbuf = NULL;
665 struct elf_link_hash_entry **sym_hashes;
666 const Elf_Internal_Rela *rel;
667 const Elf_Internal_Rela *rel_end;
668 bfd * dynobj;
669 bfd_vma * local_got_offsets;
670 asection * sgot;
671 asection * srelgot;
672 asection * sreloc;
673 bfd_boolean result = FALSE;
674
675 sgot = NULL;
676 srelgot = NULL;
677 sreloc = NULL;
678
679 if (info->relocatable)
680 return TRUE;
681
682 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
683 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
684 sym_hashes = elf_sym_hashes (abfd);
685
686 dynobj = elf_hash_table (info)->dynobj;
687 local_got_offsets = elf_local_got_offsets (abfd);
688 rel_end = relocs + sec->reloc_count;
689 sym_diff_reloc_seen = FALSE;
690
691 for (rel = relocs; rel < rel_end; rel++)
692 {
693 struct elf_link_hash_entry *h;
694 unsigned long r_symndx;
695 unsigned int r_type;
696
697 r_symndx = ELF32_R_SYM (rel->r_info);
698 if (r_symndx < symtab_hdr->sh_info)
699 h = NULL;
700 else
701 {
702 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
703 while (h->root.type == bfd_link_hash_indirect
704 || h->root.type == bfd_link_hash_warning)
705 h = (struct elf_link_hash_entry *) h->root.u.i.link;
706 }
707
708 r_type = ELF32_R_TYPE (rel->r_info);
709
710 /* Some relocs require a global offset table. */
711 if (dynobj == NULL)
712 {
713 switch (r_type)
714 {
715 case R_MN10300_GOT32:
716 case R_MN10300_GOT24:
717 case R_MN10300_GOT16:
718 case R_MN10300_GOTOFF32:
719 case R_MN10300_GOTOFF24:
720 case R_MN10300_GOTOFF16:
721 case R_MN10300_GOTPC32:
722 case R_MN10300_GOTPC16:
723 elf_hash_table (info)->dynobj = dynobj = abfd;
724 if (! _bfd_mn10300_elf_create_got_section (dynobj, info))
725 goto fail;
726 break;
727
728 default:
729 break;
730 }
731 }
732
733 switch (r_type)
734 {
735 /* This relocation describes the C++ object vtable hierarchy.
736 Reconstruct it for later use during GC. */
737 case R_MN10300_GNU_VTINHERIT:
738 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
739 goto fail;
740 break;
741
742 /* This relocation describes which C++ vtable entries are actually
743 used. Record for later use during GC. */
744 case R_MN10300_GNU_VTENTRY:
745 BFD_ASSERT (h != NULL);
746 if (h != NULL
747 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
748 goto fail;
749 break;
750
751 case R_MN10300_GOT32:
752 case R_MN10300_GOT24:
753 case R_MN10300_GOT16:
754 /* This symbol requires a global offset table entry. */
755
756 if (sgot == NULL)
757 {
758 sgot = bfd_get_section_by_name (dynobj, ".got");
759 BFD_ASSERT (sgot != NULL);
760 }
761
762 if (srelgot == NULL
763 && (h != NULL || info->shared))
764 {
765 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
766 if (srelgot == NULL)
767 {
768 srelgot = bfd_make_section_with_flags (dynobj,
769 ".rela.got",
770 (SEC_ALLOC
771 | SEC_LOAD
772 | SEC_HAS_CONTENTS
773 | SEC_IN_MEMORY
774 | SEC_LINKER_CREATED
775 | SEC_READONLY));
776 if (srelgot == NULL
777 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
778 goto fail;
779 }
780 }
781
782 if (h != NULL)
783 {
784 if (h->got.offset != (bfd_vma) -1)
785 /* We have already allocated space in the .got. */
786 break;
787
788 h->got.offset = sgot->size;
789
790 /* Make sure this symbol is output as a dynamic symbol. */
791 if (h->dynindx == -1)
792 {
793 if (! bfd_elf_link_record_dynamic_symbol (info, h))
794 goto fail;
795 }
796
797 srelgot->size += sizeof (Elf32_External_Rela);
798 }
799 else
800 {
801 /* This is a global offset table entry for a local
802 symbol. */
803 if (local_got_offsets == NULL)
804 {
805 size_t size;
806 unsigned int i;
807
808 size = symtab_hdr->sh_info * sizeof (bfd_vma);
809 local_got_offsets = bfd_alloc (abfd, size);
810
811 if (local_got_offsets == NULL)
812 goto fail;
813
814 elf_local_got_offsets (abfd) = local_got_offsets;
815
816 for (i = 0; i < symtab_hdr->sh_info; i++)
817 local_got_offsets[i] = (bfd_vma) -1;
818 }
819
820 if (local_got_offsets[r_symndx] != (bfd_vma) -1)
821 /* We have already allocated space in the .got. */
822 break;
823
824 local_got_offsets[r_symndx] = sgot->size;
825
826 if (info->shared)
827 /* If we are generating a shared object, we need to
828 output a R_MN10300_RELATIVE reloc so that the dynamic
829 linker can adjust this GOT entry. */
830 srelgot->size += sizeof (Elf32_External_Rela);
831 }
832
833 sgot->size += 4;
834 break;
835
836 case R_MN10300_PLT32:
837 case R_MN10300_PLT16:
838 /* This symbol requires a procedure linkage table entry. We
839 actually build the entry in adjust_dynamic_symbol,
840 because this might be a case of linking PIC code which is
841 never referenced by a dynamic object, in which case we
842 don't need to generate a procedure linkage table entry
843 after all. */
844
845 /* If this is a local symbol, we resolve it directly without
846 creating a procedure linkage table entry. */
847 if (h == NULL)
848 continue;
849
850 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
851 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
852 break;
853
854 h->needs_plt = 1;
855 break;
856
857 case R_MN10300_24:
858 case R_MN10300_16:
859 case R_MN10300_8:
860 case R_MN10300_PCREL32:
861 case R_MN10300_PCREL16:
862 case R_MN10300_PCREL8:
863 if (h != NULL)
864 h->non_got_ref = 1;
865 break;
866
867 case R_MN10300_SYM_DIFF:
868 sym_diff_reloc_seen = TRUE;
869 break;
870
871 case R_MN10300_32:
872 if (h != NULL)
873 h->non_got_ref = 1;
874
875 /* If we are creating a shared library, then we
876 need to copy the reloc into the shared library. */
877 if (info->shared
878 && (sec->flags & SEC_ALLOC) != 0
879 /* Do not generate a dynamic reloc for a
880 reloc associated with a SYM_DIFF operation. */
881 && ! sym_diff_reloc_seen)
882 {
883 asection * sym_section = NULL;
884
885 /* Find the section containing the
886 symbol involved in the relocation. */
887 if (h == NULL)
888 {
889 Elf_Internal_Sym * isym;
890
891 if (isymbuf == NULL)
892 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
893 symtab_hdr->sh_info, 0,
894 NULL, NULL, NULL);
895 if (isymbuf)
896 {
897 isym = isymbuf + r_symndx;
898 /* All we care about is whether this local symbol is absolute. */
899 if (isym->st_shndx == SHN_ABS)
900 sym_section = bfd_abs_section_ptr;
901 }
902 }
903 else
904 {
905 if (h->root.type == bfd_link_hash_defined
906 || h->root.type == bfd_link_hash_defweak)
907 sym_section = h->root.u.def.section;
908 }
909
910 /* If the symbol is absolute then the relocation can
911 be resolved during linking and there is no need for
912 a dynamic reloc. */
913 if (sym_section != bfd_abs_section_ptr)
914 {
915 /* When creating a shared object, we must copy these
916 reloc types into the output file. We create a reloc
917 section in dynobj and make room for this reloc. */
918 if (sreloc == NULL)
919 {
920 const char * name;
921
922 name = (bfd_elf_string_from_elf_section
923 (abfd,
924 elf_elfheader (abfd)->e_shstrndx,
925 elf_section_data (sec)->rel_hdr.sh_name));
926 if (name == NULL)
927 goto fail;
928
929 BFD_ASSERT (CONST_STRNEQ (name, ".rela")
930 && streq (bfd_get_section_name (abfd, sec), name + 5));
931
932 sreloc = bfd_get_section_by_name (dynobj, name);
933 if (sreloc == NULL)
934 {
935 flagword flags;
936
937 flags = (SEC_HAS_CONTENTS | SEC_READONLY
938 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
939 if ((sec->flags & SEC_ALLOC) != 0)
940 flags |= SEC_ALLOC | SEC_LOAD;
941 sreloc = bfd_make_section_with_flags (dynobj, name, flags);
942 if (sreloc == NULL
943 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
944 goto fail;
945 }
946 }
947
948 sreloc->size += sizeof (Elf32_External_Rela);
949 }
950 }
951
952 break;
953 }
954
955 if (ELF32_R_TYPE (rel->r_info) != R_MN10300_SYM_DIFF)
956 sym_diff_reloc_seen = FALSE;
957 }
958
959 result = TRUE;
960 fail:
961 if (isymbuf != NULL)
962 free (isymbuf);
963
964 return result;
965 }
966
967 /* Return the section that should be marked against GC for a given
968 relocation. */
969
970 static asection *
971 mn10300_elf_gc_mark_hook (asection *sec,
972 struct bfd_link_info *info,
973 Elf_Internal_Rela *rel,
974 struct elf_link_hash_entry *h,
975 Elf_Internal_Sym *sym)
976 {
977 if (h != NULL)
978 switch (ELF32_R_TYPE (rel->r_info))
979 {
980 case R_MN10300_GNU_VTINHERIT:
981 case R_MN10300_GNU_VTENTRY:
982 return NULL;
983 }
984
985 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
986 }
987
988 /* Perform a relocation as part of a final link. */
989
990 static bfd_reloc_status_type
991 mn10300_elf_final_link_relocate (reloc_howto_type *howto,
992 bfd *input_bfd,
993 bfd *output_bfd ATTRIBUTE_UNUSED,
994 asection *input_section,
995 bfd_byte *contents,
996 bfd_vma offset,
997 bfd_vma value,
998 bfd_vma addend,
999 struct elf_link_hash_entry * h,
1000 unsigned long symndx,
1001 struct bfd_link_info *info,
1002 asection *sym_sec ATTRIBUTE_UNUSED,
1003 int is_local ATTRIBUTE_UNUSED)
1004 {
1005 static asection * sym_diff_section;
1006 static bfd_vma sym_diff_value;
1007 bfd_boolean is_sym_diff_reloc;
1008 unsigned long r_type = howto->type;
1009 bfd_byte * hit_data = contents + offset;
1010 bfd * dynobj;
1011 bfd_vma * local_got_offsets;
1012 asection * sgot;
1013 asection * splt;
1014 asection * sreloc;
1015
1016 dynobj = elf_hash_table (info)->dynobj;
1017 local_got_offsets = elf_local_got_offsets (input_bfd);
1018
1019 sgot = NULL;
1020 splt = NULL;
1021 sreloc = NULL;
1022
1023 switch (r_type)
1024 {
1025 case R_MN10300_24:
1026 case R_MN10300_16:
1027 case R_MN10300_8:
1028 case R_MN10300_PCREL8:
1029 case R_MN10300_PCREL16:
1030 case R_MN10300_PCREL32:
1031 case R_MN10300_GOTOFF32:
1032 case R_MN10300_GOTOFF24:
1033 case R_MN10300_GOTOFF16:
1034 if (info->shared
1035 && (input_section->flags & SEC_ALLOC) != 0
1036 && h != NULL
1037 && ! SYMBOL_REFERENCES_LOCAL (info, h))
1038 return bfd_reloc_dangerous;
1039 }
1040
1041 is_sym_diff_reloc = FALSE;
1042 if (sym_diff_section != NULL)
1043 {
1044 BFD_ASSERT (sym_diff_section == input_section);
1045
1046 switch (r_type)
1047 {
1048 case R_MN10300_32:
1049 case R_MN10300_24:
1050 case R_MN10300_16:
1051 case R_MN10300_8:
1052 value -= sym_diff_value;
1053 /* If we are computing a 32-bit value for the location lists
1054 and the result is 0 then we add one to the value. A zero
1055 value can result because of linker relaxation deleteing
1056 prologue instructions and using a value of 1 (for the begin
1057 and end offsets in the location list entry) results in a
1058 nul entry which does not prevent the following entries from
1059 being parsed. */
1060 if (r_type == R_MN10300_32
1061 && value == 0
1062 && strcmp (input_section->name, ".debug_loc") == 0)
1063 value = 1;
1064 sym_diff_section = NULL;
1065 is_sym_diff_reloc = TRUE;
1066 break;
1067
1068 default:
1069 sym_diff_section = NULL;
1070 break;
1071 }
1072 }
1073
1074 switch (r_type)
1075 {
1076 case R_MN10300_SYM_DIFF:
1077 BFD_ASSERT (addend == 0);
1078 /* Cache the input section and value.
1079 The offset is unreliable, since relaxation may
1080 have reduced the following reloc's offset. */
1081 sym_diff_section = input_section;
1082 sym_diff_value = value;
1083 return bfd_reloc_ok;
1084
1085 case R_MN10300_ALIGN:
1086 case R_MN10300_NONE:
1087 return bfd_reloc_ok;
1088
1089 case R_MN10300_32:
1090 if (info->shared
1091 /* Do not generate relocs when an R_MN10300_32 has been used
1092 with an R_MN10300_SYM_DIFF to compute a difference of two
1093 symbols. */
1094 && is_sym_diff_reloc == FALSE
1095 /* Also, do not generate a reloc when the symbol associated
1096 with the R_MN10300_32 reloc is absolute - there is no
1097 need for a run time computation in this case. */
1098 && sym_sec != bfd_abs_section_ptr
1099 /* If the section is not going to be allocated at load time
1100 then there is no need to generate relocs for it. */
1101 && (input_section->flags & SEC_ALLOC) != 0)
1102 {
1103 Elf_Internal_Rela outrel;
1104 bfd_boolean skip, relocate;
1105
1106 /* When generating a shared object, these relocations are
1107 copied into the output file to be resolved at run
1108 time. */
1109 if (sreloc == NULL)
1110 {
1111 const char * name;
1112
1113 name = (bfd_elf_string_from_elf_section
1114 (input_bfd,
1115 elf_elfheader (input_bfd)->e_shstrndx,
1116 elf_section_data (input_section)->rel_hdr.sh_name));
1117 if (name == NULL)
1118 return FALSE;
1119
1120 BFD_ASSERT (CONST_STRNEQ (name, ".rela")
1121 && streq (bfd_get_section_name (input_bfd,
1122 input_section),
1123 name + 5));
1124
1125 sreloc = bfd_get_section_by_name (dynobj, name);
1126 BFD_ASSERT (sreloc != NULL);
1127 }
1128
1129 skip = FALSE;
1130
1131 outrel.r_offset = _bfd_elf_section_offset (input_bfd, info,
1132 input_section, offset);
1133 if (outrel.r_offset == (bfd_vma) -1)
1134 skip = TRUE;
1135
1136 outrel.r_offset += (input_section->output_section->vma
1137 + input_section->output_offset);
1138
1139 if (skip)
1140 {
1141 memset (&outrel, 0, sizeof outrel);
1142 relocate = FALSE;
1143 }
1144 else
1145 {
1146 /* h->dynindx may be -1 if this symbol was marked to
1147 become local. */
1148 if (h == NULL
1149 || SYMBOL_REFERENCES_LOCAL (info, h))
1150 {
1151 relocate = TRUE;
1152 outrel.r_info = ELF32_R_INFO (0, R_MN10300_RELATIVE);
1153 outrel.r_addend = value + addend;
1154 }
1155 else
1156 {
1157 BFD_ASSERT (h->dynindx != -1);
1158 relocate = FALSE;
1159 outrel.r_info = ELF32_R_INFO (h->dynindx, R_MN10300_32);
1160 outrel.r_addend = value + addend;
1161 }
1162 }
1163
1164 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1165 (bfd_byte *) (((Elf32_External_Rela *) sreloc->contents)
1166 + sreloc->reloc_count));
1167 ++sreloc->reloc_count;
1168
1169 /* If this reloc is against an external symbol, we do
1170 not want to fiddle with the addend. Otherwise, we
1171 need to include the symbol value so that it becomes
1172 an addend for the dynamic reloc. */
1173 if (! relocate)
1174 return bfd_reloc_ok;
1175 }
1176 value += addend;
1177 bfd_put_32 (input_bfd, value, hit_data);
1178 return bfd_reloc_ok;
1179
1180 case R_MN10300_24:
1181 value += addend;
1182
1183 if ((long) value > 0x7fffff || (long) value < -0x800000)
1184 return bfd_reloc_overflow;
1185
1186 bfd_put_8 (input_bfd, value & 0xff, hit_data);
1187 bfd_put_8 (input_bfd, (value >> 8) & 0xff, hit_data + 1);
1188 bfd_put_8 (input_bfd, (value >> 16) & 0xff, hit_data + 2);
1189 return bfd_reloc_ok;
1190
1191 case R_MN10300_16:
1192 value += addend;
1193
1194 if ((long) value > 0x7fff || (long) value < -0x8000)
1195 return bfd_reloc_overflow;
1196
1197 bfd_put_16 (input_bfd, value, hit_data);
1198 return bfd_reloc_ok;
1199
1200 case R_MN10300_8:
1201 value += addend;
1202
1203 if ((long) value > 0x7f || (long) value < -0x80)
1204 return bfd_reloc_overflow;
1205
1206 bfd_put_8 (input_bfd, value, hit_data);
1207 return bfd_reloc_ok;
1208
1209 case R_MN10300_PCREL8:
1210 value -= (input_section->output_section->vma
1211 + input_section->output_offset);
1212 value -= offset;
1213 value += addend;
1214
1215 if ((long) value > 0xff || (long) value < -0x100)
1216 return bfd_reloc_overflow;
1217
1218 bfd_put_8 (input_bfd, value, hit_data);
1219 return bfd_reloc_ok;
1220
1221 case R_MN10300_PCREL16:
1222 value -= (input_section->output_section->vma
1223 + input_section->output_offset);
1224 value -= offset;
1225 value += addend;
1226
1227 if ((long) value > 0xffff || (long) value < -0x10000)
1228 return bfd_reloc_overflow;
1229
1230 bfd_put_16 (input_bfd, value, hit_data);
1231 return bfd_reloc_ok;
1232
1233 case R_MN10300_PCREL32:
1234 value -= (input_section->output_section->vma
1235 + input_section->output_offset);
1236 value -= offset;
1237 value += addend;
1238
1239 bfd_put_32 (input_bfd, value, hit_data);
1240 return bfd_reloc_ok;
1241
1242 case R_MN10300_GNU_VTINHERIT:
1243 case R_MN10300_GNU_VTENTRY:
1244 return bfd_reloc_ok;
1245
1246 case R_MN10300_GOTPC32:
1247 /* Use global offset table as symbol value. */
1248 value = bfd_get_section_by_name (dynobj,
1249 ".got")->output_section->vma;
1250 value -= (input_section->output_section->vma
1251 + input_section->output_offset);
1252 value -= offset;
1253 value += addend;
1254
1255 bfd_put_32 (input_bfd, value, hit_data);
1256 return bfd_reloc_ok;
1257
1258 case R_MN10300_GOTPC16:
1259 /* Use global offset table as symbol value. */
1260 value = bfd_get_section_by_name (dynobj,
1261 ".got")->output_section->vma;
1262 value -= (input_section->output_section->vma
1263 + input_section->output_offset);
1264 value -= offset;
1265 value += addend;
1266
1267 if ((long) value > 0xffff || (long) value < -0x10000)
1268 return bfd_reloc_overflow;
1269
1270 bfd_put_16 (input_bfd, value, hit_data);
1271 return bfd_reloc_ok;
1272
1273 case R_MN10300_GOTOFF32:
1274 value -= bfd_get_section_by_name (dynobj,
1275 ".got")->output_section->vma;
1276 value += addend;
1277
1278 bfd_put_32 (input_bfd, value, hit_data);
1279 return bfd_reloc_ok;
1280
1281 case R_MN10300_GOTOFF24:
1282 value -= bfd_get_section_by_name (dynobj,
1283 ".got")->output_section->vma;
1284 value += addend;
1285
1286 if ((long) value > 0x7fffff || (long) value < -0x800000)
1287 return bfd_reloc_overflow;
1288
1289 bfd_put_8 (input_bfd, value, hit_data);
1290 bfd_put_8 (input_bfd, (value >> 8) & 0xff, hit_data + 1);
1291 bfd_put_8 (input_bfd, (value >> 16) & 0xff, hit_data + 2);
1292 return bfd_reloc_ok;
1293
1294 case R_MN10300_GOTOFF16:
1295 value -= bfd_get_section_by_name (dynobj,
1296 ".got")->output_section->vma;
1297 value += addend;
1298
1299 if ((long) value > 0xffff || (long) value < -0x10000)
1300 return bfd_reloc_overflow;
1301
1302 bfd_put_16 (input_bfd, value, hit_data);
1303 return bfd_reloc_ok;
1304
1305 case R_MN10300_PLT32:
1306 if (h != NULL
1307 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
1308 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
1309 && h->plt.offset != (bfd_vma) -1)
1310 {
1311 asection * splt;
1312
1313 splt = bfd_get_section_by_name (dynobj, ".plt");
1314
1315 value = (splt->output_section->vma
1316 + splt->output_offset
1317 + h->plt.offset) - value;
1318 }
1319
1320 value -= (input_section->output_section->vma
1321 + input_section->output_offset);
1322 value -= offset;
1323 value += addend;
1324
1325 bfd_put_32 (input_bfd, value, hit_data);
1326 return bfd_reloc_ok;
1327
1328 case R_MN10300_PLT16:
1329 if (h != NULL
1330 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
1331 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
1332 && h->plt.offset != (bfd_vma) -1)
1333 {
1334 asection * splt;
1335
1336 splt = bfd_get_section_by_name (dynobj, ".plt");
1337
1338 value = (splt->output_section->vma
1339 + splt->output_offset
1340 + h->plt.offset) - value;
1341 }
1342
1343 value -= (input_section->output_section->vma
1344 + input_section->output_offset);
1345 value -= offset;
1346 value += addend;
1347
1348 if ((long) value > 0xffff || (long) value < -0x10000)
1349 return bfd_reloc_overflow;
1350
1351 bfd_put_16 (input_bfd, value, hit_data);
1352 return bfd_reloc_ok;
1353
1354 case R_MN10300_GOT32:
1355 case R_MN10300_GOT24:
1356 case R_MN10300_GOT16:
1357 {
1358 asection * sgot;
1359
1360 sgot = bfd_get_section_by_name (dynobj, ".got");
1361
1362 if (h != NULL)
1363 {
1364 bfd_vma off;
1365
1366 off = h->got.offset;
1367 BFD_ASSERT (off != (bfd_vma) -1);
1368
1369 if (! elf_hash_table (info)->dynamic_sections_created
1370 || SYMBOL_REFERENCES_LOCAL (info, h))
1371 /* This is actually a static link, or it is a
1372 -Bsymbolic link and the symbol is defined
1373 locally, or the symbol was forced to be local
1374 because of a version file. We must initialize
1375 this entry in the global offset table.
1376
1377 When doing a dynamic link, we create a .rela.got
1378 relocation entry to initialize the value. This
1379 is done in the finish_dynamic_symbol routine. */
1380 bfd_put_32 (output_bfd, value,
1381 sgot->contents + off);
1382
1383 value = sgot->output_offset + off;
1384 }
1385 else
1386 {
1387 bfd_vma off;
1388
1389 off = elf_local_got_offsets (input_bfd)[symndx];
1390
1391 bfd_put_32 (output_bfd, value, sgot->contents + off);
1392
1393 if (info->shared)
1394 {
1395 asection * srelgot;
1396 Elf_Internal_Rela outrel;
1397
1398 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1399 BFD_ASSERT (srelgot != NULL);
1400
1401 outrel.r_offset = (sgot->output_section->vma
1402 + sgot->output_offset
1403 + off);
1404 outrel.r_info = ELF32_R_INFO (0, R_MN10300_RELATIVE);
1405 outrel.r_addend = value;
1406 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1407 (bfd_byte *) (((Elf32_External_Rela *)
1408 srelgot->contents)
1409 + srelgot->reloc_count));
1410 ++ srelgot->reloc_count;
1411 }
1412
1413 value = sgot->output_offset + off;
1414 }
1415 }
1416
1417 value += addend;
1418
1419 if (r_type == R_MN10300_GOT32)
1420 {
1421 bfd_put_32 (input_bfd, value, hit_data);
1422 return bfd_reloc_ok;
1423 }
1424 else if (r_type == R_MN10300_GOT24)
1425 {
1426 if ((long) value > 0x7fffff || (long) value < -0x800000)
1427 return bfd_reloc_overflow;
1428
1429 bfd_put_8 (input_bfd, value & 0xff, hit_data);
1430 bfd_put_8 (input_bfd, (value >> 8) & 0xff, hit_data + 1);
1431 bfd_put_8 (input_bfd, (value >> 16) & 0xff, hit_data + 2);
1432 return bfd_reloc_ok;
1433 }
1434 else if (r_type == R_MN10300_GOT16)
1435 {
1436 if ((long) value > 0xffff || (long) value < -0x10000)
1437 return bfd_reloc_overflow;
1438
1439 bfd_put_16 (input_bfd, value, hit_data);
1440 return bfd_reloc_ok;
1441 }
1442 /* Fall through. */
1443
1444 default:
1445 return bfd_reloc_notsupported;
1446 }
1447 }
1448 \f
1449 /* Relocate an MN10300 ELF section. */
1450
1451 static bfd_boolean
1452 mn10300_elf_relocate_section (bfd *output_bfd,
1453 struct bfd_link_info *info,
1454 bfd *input_bfd,
1455 asection *input_section,
1456 bfd_byte *contents,
1457 Elf_Internal_Rela *relocs,
1458 Elf_Internal_Sym *local_syms,
1459 asection **local_sections)
1460 {
1461 Elf_Internal_Shdr *symtab_hdr;
1462 struct elf_link_hash_entry **sym_hashes;
1463 Elf_Internal_Rela *rel, *relend;
1464
1465 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1466 sym_hashes = elf_sym_hashes (input_bfd);
1467
1468 rel = relocs;
1469 relend = relocs + input_section->reloc_count;
1470 for (; rel < relend; rel++)
1471 {
1472 int r_type;
1473 reloc_howto_type *howto;
1474 unsigned long r_symndx;
1475 Elf_Internal_Sym *sym;
1476 asection *sec;
1477 struct elf32_mn10300_link_hash_entry *h;
1478 bfd_vma relocation;
1479 bfd_reloc_status_type r;
1480
1481 r_symndx = ELF32_R_SYM (rel->r_info);
1482 r_type = ELF32_R_TYPE (rel->r_info);
1483 howto = elf_mn10300_howto_table + r_type;
1484
1485 /* Just skip the vtable gc relocs. */
1486 if (r_type == R_MN10300_GNU_VTINHERIT
1487 || r_type == R_MN10300_GNU_VTENTRY)
1488 continue;
1489
1490 h = NULL;
1491 sym = NULL;
1492 sec = NULL;
1493 if (r_symndx < symtab_hdr->sh_info)
1494 {
1495 sym = local_syms + r_symndx;
1496 sec = local_sections[r_symndx];
1497 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1498 }
1499 else
1500 {
1501 bfd_boolean unresolved_reloc;
1502 bfd_boolean warned;
1503 struct elf_link_hash_entry *hh;
1504
1505 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1506 r_symndx, symtab_hdr, sym_hashes,
1507 hh, sec, relocation,
1508 unresolved_reloc, warned);
1509
1510 h = (struct elf32_mn10300_link_hash_entry *) hh;
1511
1512 if ((h->root.root.type == bfd_link_hash_defined
1513 || h->root.root.type == bfd_link_hash_defweak)
1514 && ( r_type == R_MN10300_GOTPC32
1515 || r_type == R_MN10300_GOTPC16
1516 || (( r_type == R_MN10300_PLT32
1517 || r_type == R_MN10300_PLT16)
1518 && ELF_ST_VISIBILITY (h->root.other) != STV_INTERNAL
1519 && ELF_ST_VISIBILITY (h->root.other) != STV_HIDDEN
1520 && h->root.plt.offset != (bfd_vma) -1)
1521 || (( r_type == R_MN10300_GOT32
1522 || r_type == R_MN10300_GOT24
1523 || r_type == R_MN10300_GOT16)
1524 && elf_hash_table (info)->dynamic_sections_created
1525 && !SYMBOL_REFERENCES_LOCAL (info, hh))
1526 || (r_type == R_MN10300_32
1527 /* _32 relocs in executables force _COPY relocs,
1528 such that the address of the symbol ends up
1529 being local. */
1530 && !info->executable
1531 && !SYMBOL_REFERENCES_LOCAL (info, hh)
1532 && ((input_section->flags & SEC_ALLOC) != 0
1533 /* DWARF will emit R_MN10300_32 relocations
1534 in its sections against symbols defined
1535 externally in shared libraries. We can't
1536 do anything with them here. */
1537 || ((input_section->flags & SEC_DEBUGGING) != 0
1538 && h->root.def_dynamic)))))
1539 /* In these cases, we don't need the relocation
1540 value. We check specially because in some
1541 obscure cases sec->output_section will be NULL. */
1542 relocation = 0;
1543
1544 else if (!info->relocatable && unresolved_reloc)
1545 (*_bfd_error_handler)
1546 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
1547 input_bfd,
1548 input_section,
1549 (long) rel->r_offset,
1550 howto->name,
1551 h->root.root.root.string);
1552 }
1553
1554 if (sec != NULL && elf_discarded_section (sec))
1555 {
1556 /* For relocs against symbols from removed linkonce sections,
1557 or sections discarded by a linker script, we just want the
1558 section contents zeroed. Avoid any special processing. */
1559 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
1560 rel->r_info = 0;
1561 rel->r_addend = 0;
1562 continue;
1563 }
1564
1565 if (info->relocatable)
1566 continue;
1567
1568 r = mn10300_elf_final_link_relocate (howto, input_bfd, output_bfd,
1569 input_section,
1570 contents, rel->r_offset,
1571 relocation, rel->r_addend,
1572 (struct elf_link_hash_entry *) h,
1573 r_symndx,
1574 info, sec, h == NULL);
1575
1576 if (r != bfd_reloc_ok)
1577 {
1578 const char *name;
1579 const char *msg = NULL;
1580
1581 if (h != NULL)
1582 name = h->root.root.root.string;
1583 else
1584 {
1585 name = (bfd_elf_string_from_elf_section
1586 (input_bfd, symtab_hdr->sh_link, sym->st_name));
1587 if (name == NULL || *name == '\0')
1588 name = bfd_section_name (input_bfd, sec);
1589 }
1590
1591 switch (r)
1592 {
1593 case bfd_reloc_overflow:
1594 if (! ((*info->callbacks->reloc_overflow)
1595 (info, (h ? &h->root.root : NULL), name,
1596 howto->name, (bfd_vma) 0, input_bfd,
1597 input_section, rel->r_offset)))
1598 return FALSE;
1599 break;
1600
1601 case bfd_reloc_undefined:
1602 if (! ((*info->callbacks->undefined_symbol)
1603 (info, name, input_bfd, input_section,
1604 rel->r_offset, TRUE)))
1605 return FALSE;
1606 break;
1607
1608 case bfd_reloc_outofrange:
1609 msg = _("internal error: out of range error");
1610 goto common_error;
1611
1612 case bfd_reloc_notsupported:
1613 msg = _("internal error: unsupported relocation error");
1614 goto common_error;
1615
1616 case bfd_reloc_dangerous:
1617 if (r_type == R_MN10300_PCREL32)
1618 msg = _("error: inappropriate relocation type for shared"
1619 " library (did you forget -fpic?)");
1620 else
1621 msg = _("internal error: suspicious relocation type used"
1622 " in shared library");
1623 goto common_error;
1624
1625 default:
1626 msg = _("internal error: unknown error");
1627 /* Fall through. */
1628
1629 common_error:
1630 if (!((*info->callbacks->warning)
1631 (info, msg, name, input_bfd, input_section,
1632 rel->r_offset)))
1633 return FALSE;
1634 break;
1635 }
1636 }
1637 }
1638
1639 return TRUE;
1640 }
1641
1642 /* Finish initializing one hash table entry. */
1643
1644 static bfd_boolean
1645 elf32_mn10300_finish_hash_table_entry (struct bfd_hash_entry *gen_entry,
1646 void * in_args)
1647 {
1648 struct elf32_mn10300_link_hash_entry *entry;
1649 struct bfd_link_info *link_info = (struct bfd_link_info *) in_args;
1650 unsigned int byte_count = 0;
1651
1652 entry = (struct elf32_mn10300_link_hash_entry *) gen_entry;
1653
1654 if (entry->root.root.type == bfd_link_hash_warning)
1655 entry = (struct elf32_mn10300_link_hash_entry *) entry->root.root.u.i.link;
1656
1657 /* If we already know we want to convert "call" to "calls" for calls
1658 to this symbol, then return now. */
1659 if (entry->flags == MN10300_CONVERT_CALL_TO_CALLS)
1660 return TRUE;
1661
1662 /* If there are no named calls to this symbol, or there's nothing we
1663 can move from the function itself into the "call" instruction,
1664 then note that all "call" instructions should be converted into
1665 "calls" instructions and return. If a symbol is available for
1666 dynamic symbol resolution (overridable or overriding), avoid
1667 custom calling conventions. */
1668 if (entry->direct_calls == 0
1669 || (entry->stack_size == 0 && entry->movm_args == 0)
1670 || (elf_hash_table (link_info)->dynamic_sections_created
1671 && ELF_ST_VISIBILITY (entry->root.other) != STV_INTERNAL
1672 && ELF_ST_VISIBILITY (entry->root.other) != STV_HIDDEN))
1673 {
1674 /* Make a note that we should convert "call" instructions to "calls"
1675 instructions for calls to this symbol. */
1676 entry->flags |= MN10300_CONVERT_CALL_TO_CALLS;
1677 return TRUE;
1678 }
1679
1680 /* We may be able to move some instructions from the function itself into
1681 the "call" instruction. Count how many bytes we might be able to
1682 eliminate in the function itself. */
1683
1684 /* A movm instruction is two bytes. */
1685 if (entry->movm_args)
1686 byte_count += 2;
1687
1688 /* Count the insn to allocate stack space too. */
1689 if (entry->stack_size > 0)
1690 {
1691 if (entry->stack_size <= 128)
1692 byte_count += 3;
1693 else
1694 byte_count += 4;
1695 }
1696
1697 /* If using "call" will result in larger code, then turn all
1698 the associated "call" instructions into "calls" instructions. */
1699 if (byte_count < entry->direct_calls)
1700 entry->flags |= MN10300_CONVERT_CALL_TO_CALLS;
1701
1702 /* This routine never fails. */
1703 return TRUE;
1704 }
1705
1706 /* Used to count hash table entries. */
1707
1708 static bfd_boolean
1709 elf32_mn10300_count_hash_table_entries (struct bfd_hash_entry *gen_entry ATTRIBUTE_UNUSED,
1710 void * in_args)
1711 {
1712 int *count = (int *) in_args;
1713
1714 (*count) ++;
1715 return TRUE;
1716 }
1717
1718 /* Used to enumerate hash table entries into a linear array. */
1719
1720 static bfd_boolean
1721 elf32_mn10300_list_hash_table_entries (struct bfd_hash_entry *gen_entry,
1722 void * in_args)
1723 {
1724 struct bfd_hash_entry ***ptr = (struct bfd_hash_entry ***) in_args;
1725
1726 **ptr = gen_entry;
1727 (*ptr) ++;
1728 return TRUE;
1729 }
1730
1731 /* Used to sort the array created by the above. */
1732
1733 static int
1734 sort_by_value (const void *va, const void *vb)
1735 {
1736 struct elf32_mn10300_link_hash_entry *a
1737 = *(struct elf32_mn10300_link_hash_entry **) va;
1738 struct elf32_mn10300_link_hash_entry *b
1739 = *(struct elf32_mn10300_link_hash_entry **) vb;
1740
1741 return a->value - b->value;
1742 }
1743
1744 /* Compute the stack size and movm arguments for the function
1745 referred to by HASH at address ADDR in section with
1746 contents CONTENTS, store the information in the hash table. */
1747
1748 static void
1749 compute_function_info (bfd *abfd,
1750 struct elf32_mn10300_link_hash_entry *hash,
1751 bfd_vma addr,
1752 unsigned char *contents)
1753 {
1754 unsigned char byte1, byte2;
1755 /* We only care about a very small subset of the possible prologue
1756 sequences here. Basically we look for:
1757
1758 movm [d2,d3,a2,a3],sp (optional)
1759 add <size>,sp (optional, and only for sizes which fit in an unsigned
1760 8 bit number)
1761
1762 If we find anything else, we quit. */
1763
1764 /* Look for movm [regs],sp. */
1765 byte1 = bfd_get_8 (abfd, contents + addr);
1766 byte2 = bfd_get_8 (abfd, contents + addr + 1);
1767
1768 if (byte1 == 0xcf)
1769 {
1770 hash->movm_args = byte2;
1771 addr += 2;
1772 byte1 = bfd_get_8 (abfd, contents + addr);
1773 byte2 = bfd_get_8 (abfd, contents + addr + 1);
1774 }
1775
1776 /* Now figure out how much stack space will be allocated by the movm
1777 instruction. We need this kept separate from the function's normal
1778 stack space. */
1779 if (hash->movm_args)
1780 {
1781 /* Space for d2. */
1782 if (hash->movm_args & 0x80)
1783 hash->movm_stack_size += 4;
1784
1785 /* Space for d3. */
1786 if (hash->movm_args & 0x40)
1787 hash->movm_stack_size += 4;
1788
1789 /* Space for a2. */
1790 if (hash->movm_args & 0x20)
1791 hash->movm_stack_size += 4;
1792
1793 /* Space for a3. */
1794 if (hash->movm_args & 0x10)
1795 hash->movm_stack_size += 4;
1796
1797 /* "other" space. d0, d1, a0, a1, mdr, lir, lar, 4 byte pad. */
1798 if (hash->movm_args & 0x08)
1799 hash->movm_stack_size += 8 * 4;
1800
1801 if (bfd_get_mach (abfd) == bfd_mach_am33
1802 || bfd_get_mach (abfd) == bfd_mach_am33_2)
1803 {
1804 /* "exother" space. e0, e1, mdrq, mcrh, mcrl, mcvf */
1805 if (hash->movm_args & 0x1)
1806 hash->movm_stack_size += 6 * 4;
1807
1808 /* exreg1 space. e4, e5, e6, e7 */
1809 if (hash->movm_args & 0x2)
1810 hash->movm_stack_size += 4 * 4;
1811
1812 /* exreg0 space. e2, e3 */
1813 if (hash->movm_args & 0x4)
1814 hash->movm_stack_size += 2 * 4;
1815 }
1816 }
1817
1818 /* Now look for the two stack adjustment variants. */
1819 if (byte1 == 0xf8 && byte2 == 0xfe)
1820 {
1821 int temp = bfd_get_8 (abfd, contents + addr + 2);
1822 temp = ((temp & 0xff) ^ (~0x7f)) + 0x80;
1823
1824 hash->stack_size = -temp;
1825 }
1826 else if (byte1 == 0xfa && byte2 == 0xfe)
1827 {
1828 int temp = bfd_get_16 (abfd, contents + addr + 2);
1829 temp = ((temp & 0xffff) ^ (~0x7fff)) + 0x8000;
1830 temp = -temp;
1831
1832 if (temp < 255)
1833 hash->stack_size = temp;
1834 }
1835
1836 /* If the total stack to be allocated by the call instruction is more
1837 than 255 bytes, then we can't remove the stack adjustment by using
1838 "call" (we might still be able to remove the "movm" instruction. */
1839 if (hash->stack_size + hash->movm_stack_size > 255)
1840 hash->stack_size = 0;
1841 }
1842
1843 /* Delete some bytes from a section while relaxing. */
1844
1845 static bfd_boolean
1846 mn10300_elf_relax_delete_bytes (bfd *abfd,
1847 asection *sec,
1848 bfd_vma addr,
1849 int count)
1850 {
1851 Elf_Internal_Shdr *symtab_hdr;
1852 unsigned int sec_shndx;
1853 bfd_byte *contents;
1854 Elf_Internal_Rela *irel, *irelend;
1855 Elf_Internal_Rela *irelalign;
1856 bfd_vma toaddr;
1857 Elf_Internal_Sym *isym, *isymend;
1858 struct elf_link_hash_entry **sym_hashes;
1859 struct elf_link_hash_entry **end_hashes;
1860 unsigned int symcount;
1861
1862 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1863
1864 contents = elf_section_data (sec)->this_hdr.contents;
1865
1866 irelalign = NULL;
1867 toaddr = sec->size;
1868
1869 irel = elf_section_data (sec)->relocs;
1870 irelend = irel + sec->reloc_count;
1871
1872 if (sec->reloc_count > 0)
1873 {
1874 /* If there is an align reloc at the end of the section ignore it.
1875 GAS creates these relocs for reasons of its own, and they just
1876 serve to keep the section artifically inflated. */
1877 if (ELF32_R_TYPE ((irelend - 1)->r_info) == (int) R_MN10300_ALIGN)
1878 --irelend;
1879
1880 /* The deletion must stop at the next ALIGN reloc for an aligment
1881 power larger than, or not a multiple of, the number of bytes we
1882 are deleting. */
1883 for (; irel < irelend; irel++)
1884 {
1885 int alignment = 1 << irel->r_addend;
1886
1887 if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_ALIGN
1888 && irel->r_offset > addr
1889 && irel->r_offset < toaddr
1890 && (count < alignment
1891 || alignment % count != 0))
1892 {
1893 irelalign = irel;
1894 toaddr = irel->r_offset;
1895 break;
1896 }
1897 }
1898 }
1899
1900 /* Actually delete the bytes. */
1901 memmove (contents + addr, contents + addr + count,
1902 (size_t) (toaddr - addr - count));
1903
1904 /* Adjust the section's size if we are shrinking it, or else
1905 pad the bytes between the end of the shrunken region and
1906 the start of the next region with NOP codes. */
1907 if (irelalign == NULL)
1908 {
1909 sec->size -= count;
1910 /* Include symbols at the end of the section, but
1911 not at the end of a sub-region of the section. */
1912 toaddr ++;
1913 }
1914 else
1915 {
1916 int i;
1917
1918 #define NOP_OPCODE 0xcb
1919
1920 for (i = 0; i < count; i ++)
1921 bfd_put_8 (abfd, (bfd_vma) NOP_OPCODE, contents + toaddr - count + i);
1922 }
1923
1924 /* Adjust all the relocs. */
1925 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
1926 {
1927 /* Get the new reloc address. */
1928 if ((irel->r_offset > addr
1929 && irel->r_offset < toaddr)
1930 || (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_ALIGN
1931 && irel->r_offset == toaddr))
1932 irel->r_offset -= count;
1933 }
1934
1935 /* Adjust the local symbols in the section, reducing their value
1936 by the number of bytes deleted. Note - symbols within the deleted
1937 region are moved to the address of the start of the region, which
1938 actually means that they will address the byte beyond the end of
1939 the region once the deletion has been completed. */
1940 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1941 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
1942 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
1943 {
1944 if (isym->st_shndx == sec_shndx
1945 && isym->st_value > addr
1946 && isym->st_value < toaddr)
1947 {
1948 if (isym->st_value < addr + count)
1949 isym->st_value = addr;
1950 else
1951 isym->st_value -= count;
1952 }
1953 /* Adjust the function symbol's size as well. */
1954 else if (isym->st_shndx == sec_shndx
1955 && ELF_ST_TYPE (isym->st_info) == STT_FUNC
1956 && isym->st_value + isym->st_size > addr
1957 && isym->st_value + isym->st_size < toaddr)
1958 isym->st_size -= count;
1959 }
1960
1961 /* Now adjust the global symbols defined in this section. */
1962 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1963 - symtab_hdr->sh_info);
1964 sym_hashes = elf_sym_hashes (abfd);
1965 end_hashes = sym_hashes + symcount;
1966 for (; sym_hashes < end_hashes; sym_hashes++)
1967 {
1968 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1969
1970 if ((sym_hash->root.type == bfd_link_hash_defined
1971 || sym_hash->root.type == bfd_link_hash_defweak)
1972 && sym_hash->root.u.def.section == sec
1973 && sym_hash->root.u.def.value > addr
1974 && sym_hash->root.u.def.value < toaddr)
1975 {
1976 if (sym_hash->root.u.def.value < addr + count)
1977 sym_hash->root.u.def.value = addr;
1978 else
1979 sym_hash->root.u.def.value -= count;
1980 }
1981 /* Adjust the function symbol's size as well. */
1982 else if (sym_hash->root.type == bfd_link_hash_defined
1983 && sym_hash->root.u.def.section == sec
1984 && sym_hash->type == STT_FUNC
1985 && sym_hash->root.u.def.value + sym_hash->size > addr
1986 && sym_hash->root.u.def.value + sym_hash->size < toaddr)
1987 sym_hash->size -= count;
1988 }
1989
1990 /* See if we can move the ALIGN reloc forward.
1991 We have adjusted r_offset for it already. */
1992 if (irelalign != NULL)
1993 {
1994 bfd_vma alignto, alignaddr;
1995
1996 if ((int) irelalign->r_addend > 0)
1997 {
1998 /* This is the old address. */
1999 alignto = BFD_ALIGN (toaddr, 1 << irelalign->r_addend);
2000 /* This is where the align points to now. */
2001 alignaddr = BFD_ALIGN (irelalign->r_offset,
2002 1 << irelalign->r_addend);
2003 if (alignaddr < alignto)
2004 /* Tail recursion. */
2005 return mn10300_elf_relax_delete_bytes (abfd, sec, alignaddr,
2006 (int) (alignto - alignaddr));
2007 }
2008 }
2009
2010 return TRUE;
2011 }
2012
2013 /* Return TRUE if a symbol exists at the given address, else return
2014 FALSE. */
2015
2016 static bfd_boolean
2017 mn10300_elf_symbol_address_p (bfd *abfd,
2018 asection *sec,
2019 Elf_Internal_Sym *isym,
2020 bfd_vma addr)
2021 {
2022 Elf_Internal_Shdr *symtab_hdr;
2023 unsigned int sec_shndx;
2024 Elf_Internal_Sym *isymend;
2025 struct elf_link_hash_entry **sym_hashes;
2026 struct elf_link_hash_entry **end_hashes;
2027 unsigned int symcount;
2028
2029 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
2030
2031 /* Examine all the symbols. */
2032 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2033 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
2034 if (isym->st_shndx == sec_shndx
2035 && isym->st_value == addr)
2036 return TRUE;
2037
2038 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
2039 - symtab_hdr->sh_info);
2040 sym_hashes = elf_sym_hashes (abfd);
2041 end_hashes = sym_hashes + symcount;
2042 for (; sym_hashes < end_hashes; sym_hashes++)
2043 {
2044 struct elf_link_hash_entry *sym_hash = *sym_hashes;
2045
2046 if ((sym_hash->root.type == bfd_link_hash_defined
2047 || sym_hash->root.type == bfd_link_hash_defweak)
2048 && sym_hash->root.u.def.section == sec
2049 && sym_hash->root.u.def.value == addr)
2050 return TRUE;
2051 }
2052
2053 return FALSE;
2054 }
2055
2056 /* This function handles relaxing for the mn10300.
2057
2058 There are quite a few relaxing opportunities available on the mn10300:
2059
2060 * calls:32 -> calls:16 2 bytes
2061 * call:32 -> call:16 2 bytes
2062
2063 * call:32 -> calls:32 1 byte
2064 * call:16 -> calls:16 1 byte
2065 * These are done anytime using "calls" would result
2066 in smaller code, or when necessary to preserve the
2067 meaning of the program.
2068
2069 * call:32 varies
2070 * call:16
2071 * In some circumstances we can move instructions
2072 from a function prologue into a "call" instruction.
2073 This is only done if the resulting code is no larger
2074 than the original code.
2075
2076 * jmp:32 -> jmp:16 2 bytes
2077 * jmp:16 -> bra:8 1 byte
2078
2079 * If the previous instruction is a conditional branch
2080 around the jump/bra, we may be able to reverse its condition
2081 and change its target to the jump's target. The jump/bra
2082 can then be deleted. 2 bytes
2083
2084 * mov abs32 -> mov abs16 1 or 2 bytes
2085
2086 * Most instructions which accept imm32 can relax to imm16 1 or 2 bytes
2087 - Most instructions which accept imm16 can relax to imm8 1 or 2 bytes
2088
2089 * Most instructions which accept d32 can relax to d16 1 or 2 bytes
2090 - Most instructions which accept d16 can relax to d8 1 or 2 bytes
2091
2092 We don't handle imm16->imm8 or d16->d8 as they're very rare
2093 and somewhat more difficult to support. */
2094
2095 static bfd_boolean
2096 mn10300_elf_relax_section (bfd *abfd,
2097 asection *sec,
2098 struct bfd_link_info *link_info,
2099 bfd_boolean *again)
2100 {
2101 Elf_Internal_Shdr *symtab_hdr;
2102 Elf_Internal_Rela *internal_relocs = NULL;
2103 Elf_Internal_Rela *irel, *irelend;
2104 bfd_byte *contents = NULL;
2105 Elf_Internal_Sym *isymbuf = NULL;
2106 struct elf32_mn10300_link_hash_table *hash_table;
2107 asection *section = sec;
2108
2109 /* Assume nothing changes. */
2110 *again = FALSE;
2111
2112 /* We need a pointer to the mn10300 specific hash table. */
2113 hash_table = elf32_mn10300_hash_table (link_info);
2114
2115 /* Initialize fields in each hash table entry the first time through. */
2116 if ((hash_table->flags & MN10300_HASH_ENTRIES_INITIALIZED) == 0)
2117 {
2118 bfd *input_bfd;
2119
2120 /* Iterate over all the input bfds. */
2121 for (input_bfd = link_info->input_bfds;
2122 input_bfd != NULL;
2123 input_bfd = input_bfd->link_next)
2124 {
2125 /* We're going to need all the symbols for each bfd. */
2126 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2127 if (symtab_hdr->sh_info != 0)
2128 {
2129 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2130 if (isymbuf == NULL)
2131 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
2132 symtab_hdr->sh_info, 0,
2133 NULL, NULL, NULL);
2134 if (isymbuf == NULL)
2135 goto error_return;
2136 }
2137
2138 /* Iterate over each section in this bfd. */
2139 for (section = input_bfd->sections;
2140 section != NULL;
2141 section = section->next)
2142 {
2143 struct elf32_mn10300_link_hash_entry *hash;
2144 Elf_Internal_Sym *sym;
2145 asection *sym_sec = NULL;
2146 const char *sym_name;
2147 char *new_name;
2148
2149 /* If there's nothing to do in this section, skip it. */
2150 if (! ((section->flags & SEC_RELOC) != 0
2151 && section->reloc_count != 0))
2152 continue;
2153 if ((section->flags & SEC_ALLOC) == 0)
2154 continue;
2155
2156 /* Get cached copy of section contents if it exists. */
2157 if (elf_section_data (section)->this_hdr.contents != NULL)
2158 contents = elf_section_data (section)->this_hdr.contents;
2159 else if (section->size != 0)
2160 {
2161 /* Go get them off disk. */
2162 if (!bfd_malloc_and_get_section (input_bfd, section,
2163 &contents))
2164 goto error_return;
2165 }
2166 else
2167 contents = NULL;
2168
2169 /* If there aren't any relocs, then there's nothing to do. */
2170 if ((section->flags & SEC_RELOC) != 0
2171 && section->reloc_count != 0)
2172 {
2173 /* Get a copy of the native relocations. */
2174 internal_relocs = _bfd_elf_link_read_relocs (input_bfd, section,
2175 NULL, NULL,
2176 link_info->keep_memory);
2177 if (internal_relocs == NULL)
2178 goto error_return;
2179
2180 /* Now examine each relocation. */
2181 irel = internal_relocs;
2182 irelend = irel + section->reloc_count;
2183 for (; irel < irelend; irel++)
2184 {
2185 long r_type;
2186 unsigned long r_index;
2187 unsigned char code;
2188
2189 r_type = ELF32_R_TYPE (irel->r_info);
2190 r_index = ELF32_R_SYM (irel->r_info);
2191
2192 if (r_type < 0 || r_type >= (int) R_MN10300_MAX)
2193 goto error_return;
2194
2195 /* We need the name and hash table entry of the target
2196 symbol! */
2197 hash = NULL;
2198 sym = NULL;
2199 sym_sec = NULL;
2200
2201 if (r_index < symtab_hdr->sh_info)
2202 {
2203 /* A local symbol. */
2204 Elf_Internal_Sym *isym;
2205 struct elf_link_hash_table *elftab;
2206 bfd_size_type amt;
2207
2208 isym = isymbuf + r_index;
2209 if (isym->st_shndx == SHN_UNDEF)
2210 sym_sec = bfd_und_section_ptr;
2211 else if (isym->st_shndx == SHN_ABS)
2212 sym_sec = bfd_abs_section_ptr;
2213 else if (isym->st_shndx == SHN_COMMON)
2214 sym_sec = bfd_com_section_ptr;
2215 else
2216 sym_sec
2217 = bfd_section_from_elf_index (input_bfd,
2218 isym->st_shndx);
2219
2220 sym_name
2221 = bfd_elf_string_from_elf_section (input_bfd,
2222 (symtab_hdr
2223 ->sh_link),
2224 isym->st_name);
2225
2226 /* If it isn't a function, then we don't care
2227 about it. */
2228 if (ELF_ST_TYPE (isym->st_info) != STT_FUNC)
2229 continue;
2230
2231 /* Tack on an ID so we can uniquely identify this
2232 local symbol in the global hash table. */
2233 amt = strlen (sym_name) + 10;
2234 new_name = bfd_malloc (amt);
2235 if (new_name == NULL)
2236 goto error_return;
2237
2238 sprintf (new_name, "%s_%08x", sym_name, sym_sec->id);
2239 sym_name = new_name;
2240
2241 elftab = &hash_table->static_hash_table->root;
2242 hash = ((struct elf32_mn10300_link_hash_entry *)
2243 elf_link_hash_lookup (elftab, sym_name,
2244 TRUE, TRUE, FALSE));
2245 free (new_name);
2246 }
2247 else
2248 {
2249 r_index -= symtab_hdr->sh_info;
2250 hash = (struct elf32_mn10300_link_hash_entry *)
2251 elf_sym_hashes (input_bfd)[r_index];
2252 }
2253
2254 sym_name = hash->root.root.root.string;
2255 if ((section->flags & SEC_CODE) != 0)
2256 {
2257 /* If this is not a "call" instruction, then we
2258 should convert "call" instructions to "calls"
2259 instructions. */
2260 code = bfd_get_8 (input_bfd,
2261 contents + irel->r_offset - 1);
2262 if (code != 0xdd && code != 0xcd)
2263 hash->flags |= MN10300_CONVERT_CALL_TO_CALLS;
2264 }
2265
2266 /* If this is a jump/call, then bump the
2267 direct_calls counter. Else force "call" to
2268 "calls" conversions. */
2269 if (r_type == R_MN10300_PCREL32
2270 || r_type == R_MN10300_PLT32
2271 || r_type == R_MN10300_PLT16
2272 || r_type == R_MN10300_PCREL16)
2273 hash->direct_calls++;
2274 else
2275 hash->flags |= MN10300_CONVERT_CALL_TO_CALLS;
2276 }
2277 }
2278
2279 /* Now look at the actual contents to get the stack size,
2280 and a list of what registers were saved in the prologue
2281 (ie movm_args). */
2282 if ((section->flags & SEC_CODE) != 0)
2283 {
2284 Elf_Internal_Sym *isym, *isymend;
2285 unsigned int sec_shndx;
2286 struct elf_link_hash_entry **hashes;
2287 struct elf_link_hash_entry **end_hashes;
2288 unsigned int symcount;
2289
2290 sec_shndx = _bfd_elf_section_from_bfd_section (input_bfd,
2291 section);
2292
2293 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
2294 - symtab_hdr->sh_info);
2295 hashes = elf_sym_hashes (input_bfd);
2296 end_hashes = hashes + symcount;
2297
2298 /* Look at each function defined in this section and
2299 update info for that function. */
2300 isymend = isymbuf + symtab_hdr->sh_info;
2301 for (isym = isymbuf; isym < isymend; isym++)
2302 {
2303 if (isym->st_shndx == sec_shndx
2304 && ELF_ST_TYPE (isym->st_info) == STT_FUNC)
2305 {
2306 struct elf_link_hash_table *elftab;
2307 bfd_size_type amt;
2308 struct elf_link_hash_entry **lhashes = hashes;
2309
2310 /* Skip a local symbol if it aliases a
2311 global one. */
2312 for (; lhashes < end_hashes; lhashes++)
2313 {
2314 hash = (struct elf32_mn10300_link_hash_entry *) *lhashes;
2315 if ((hash->root.root.type == bfd_link_hash_defined
2316 || hash->root.root.type == bfd_link_hash_defweak)
2317 && hash->root.root.u.def.section == section
2318 && hash->root.type == STT_FUNC
2319 && hash->root.root.u.def.value == isym->st_value)
2320 break;
2321 }
2322 if (lhashes != end_hashes)
2323 continue;
2324
2325 if (isym->st_shndx == SHN_UNDEF)
2326 sym_sec = bfd_und_section_ptr;
2327 else if (isym->st_shndx == SHN_ABS)
2328 sym_sec = bfd_abs_section_ptr;
2329 else if (isym->st_shndx == SHN_COMMON)
2330 sym_sec = bfd_com_section_ptr;
2331 else
2332 sym_sec
2333 = bfd_section_from_elf_index (input_bfd,
2334 isym->st_shndx);
2335
2336 sym_name = (bfd_elf_string_from_elf_section
2337 (input_bfd, symtab_hdr->sh_link,
2338 isym->st_name));
2339
2340 /* Tack on an ID so we can uniquely identify this
2341 local symbol in the global hash table. */
2342 amt = strlen (sym_name) + 10;
2343 new_name = bfd_malloc (amt);
2344 if (new_name == NULL)
2345 goto error_return;
2346
2347 sprintf (new_name, "%s_%08x", sym_name, sym_sec->id);
2348 sym_name = new_name;
2349
2350 elftab = &hash_table->static_hash_table->root;
2351 hash = ((struct elf32_mn10300_link_hash_entry *)
2352 elf_link_hash_lookup (elftab, sym_name,
2353 TRUE, TRUE, FALSE));
2354 free (new_name);
2355 compute_function_info (input_bfd, hash,
2356 isym->st_value, contents);
2357 hash->value = isym->st_value;
2358 }
2359 }
2360
2361 for (; hashes < end_hashes; hashes++)
2362 {
2363 hash = (struct elf32_mn10300_link_hash_entry *) *hashes;
2364 if ((hash->root.root.type == bfd_link_hash_defined
2365 || hash->root.root.type == bfd_link_hash_defweak)
2366 && hash->root.root.u.def.section == section
2367 && hash->root.type == STT_FUNC)
2368 compute_function_info (input_bfd, hash,
2369 (hash)->root.root.u.def.value,
2370 contents);
2371 }
2372 }
2373
2374 /* Cache or free any memory we allocated for the relocs. */
2375 if (internal_relocs != NULL
2376 && elf_section_data (section)->relocs != internal_relocs)
2377 free (internal_relocs);
2378 internal_relocs = NULL;
2379
2380 /* Cache or free any memory we allocated for the contents. */
2381 if (contents != NULL
2382 && elf_section_data (section)->this_hdr.contents != contents)
2383 {
2384 if (! link_info->keep_memory)
2385 free (contents);
2386 else
2387 {
2388 /* Cache the section contents for elf_link_input_bfd. */
2389 elf_section_data (section)->this_hdr.contents = contents;
2390 }
2391 }
2392 contents = NULL;
2393 }
2394
2395 /* Cache or free any memory we allocated for the symbols. */
2396 if (isymbuf != NULL
2397 && symtab_hdr->contents != (unsigned char *) isymbuf)
2398 {
2399 if (! link_info->keep_memory)
2400 free (isymbuf);
2401 else
2402 {
2403 /* Cache the symbols for elf_link_input_bfd. */
2404 symtab_hdr->contents = (unsigned char *) isymbuf;
2405 }
2406 }
2407 isymbuf = NULL;
2408 }
2409
2410 /* Now iterate on each symbol in the hash table and perform
2411 the final initialization steps on each. */
2412 elf32_mn10300_link_hash_traverse (hash_table,
2413 elf32_mn10300_finish_hash_table_entry,
2414 link_info);
2415 elf32_mn10300_link_hash_traverse (hash_table->static_hash_table,
2416 elf32_mn10300_finish_hash_table_entry,
2417 link_info);
2418
2419 {
2420 /* This section of code collects all our local symbols, sorts
2421 them by value, and looks for multiple symbols referring to
2422 the same address. For those symbols, the flags are merged.
2423 At this point, the only flag that can be set is
2424 MN10300_CONVERT_CALL_TO_CALLS, so we simply OR the flags
2425 together. */
2426 int static_count = 0, i;
2427 struct elf32_mn10300_link_hash_entry **entries;
2428 struct elf32_mn10300_link_hash_entry **ptr;
2429
2430 elf32_mn10300_link_hash_traverse (hash_table->static_hash_table,
2431 elf32_mn10300_count_hash_table_entries,
2432 &static_count);
2433
2434 entries = bfd_malloc (static_count * sizeof (* ptr));
2435
2436 ptr = entries;
2437 elf32_mn10300_link_hash_traverse (hash_table->static_hash_table,
2438 elf32_mn10300_list_hash_table_entries,
2439 & ptr);
2440
2441 qsort (entries, static_count, sizeof (entries[0]), sort_by_value);
2442
2443 for (i = 0; i < static_count - 1; i++)
2444 if (entries[i]->value && entries[i]->value == entries[i+1]->value)
2445 {
2446 int v = entries[i]->flags;
2447 int j;
2448
2449 for (j = i + 1; j < static_count && entries[j]->value == entries[i]->value; j++)
2450 v |= entries[j]->flags;
2451
2452 for (j = i; j < static_count && entries[j]->value == entries[i]->value; j++)
2453 entries[j]->flags = v;
2454
2455 i = j - 1;
2456 }
2457 }
2458
2459 /* All entries in the hash table are fully initialized. */
2460 hash_table->flags |= MN10300_HASH_ENTRIES_INITIALIZED;
2461
2462 /* Now that everything has been initialized, go through each
2463 code section and delete any prologue insns which will be
2464 redundant because their operations will be performed by
2465 a "call" instruction. */
2466 for (input_bfd = link_info->input_bfds;
2467 input_bfd != NULL;
2468 input_bfd = input_bfd->link_next)
2469 {
2470 /* We're going to need all the local symbols for each bfd. */
2471 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2472 if (symtab_hdr->sh_info != 0)
2473 {
2474 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2475 if (isymbuf == NULL)
2476 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
2477 symtab_hdr->sh_info, 0,
2478 NULL, NULL, NULL);
2479 if (isymbuf == NULL)
2480 goto error_return;
2481 }
2482
2483 /* Walk over each section in this bfd. */
2484 for (section = input_bfd->sections;
2485 section != NULL;
2486 section = section->next)
2487 {
2488 unsigned int sec_shndx;
2489 Elf_Internal_Sym *isym, *isymend;
2490 struct elf_link_hash_entry **hashes;
2491 struct elf_link_hash_entry **end_hashes;
2492 unsigned int symcount;
2493
2494 /* Skip non-code sections and empty sections. */
2495 if ((section->flags & SEC_CODE) == 0 || section->size == 0)
2496 continue;
2497
2498 if (section->reloc_count != 0)
2499 {
2500 /* Get a copy of the native relocations. */
2501 internal_relocs = _bfd_elf_link_read_relocs (input_bfd, section,
2502 NULL, NULL,
2503 link_info->keep_memory);
2504 if (internal_relocs == NULL)
2505 goto error_return;
2506 }
2507
2508 /* Get cached copy of section contents if it exists. */
2509 if (elf_section_data (section)->this_hdr.contents != NULL)
2510 contents = elf_section_data (section)->this_hdr.contents;
2511 else
2512 {
2513 /* Go get them off disk. */
2514 if (!bfd_malloc_and_get_section (input_bfd, section,
2515 &contents))
2516 goto error_return;
2517 }
2518
2519 sec_shndx = _bfd_elf_section_from_bfd_section (input_bfd,
2520 section);
2521
2522 /* Now look for any function in this section which needs
2523 insns deleted from its prologue. */
2524 isymend = isymbuf + symtab_hdr->sh_info;
2525 for (isym = isymbuf; isym < isymend; isym++)
2526 {
2527 struct elf32_mn10300_link_hash_entry *sym_hash;
2528 asection *sym_sec = NULL;
2529 const char *sym_name;
2530 char *new_name;
2531 struct elf_link_hash_table *elftab;
2532 bfd_size_type amt;
2533
2534 if (isym->st_shndx != sec_shndx)
2535 continue;
2536
2537 if (isym->st_shndx == SHN_UNDEF)
2538 sym_sec = bfd_und_section_ptr;
2539 else if (isym->st_shndx == SHN_ABS)
2540 sym_sec = bfd_abs_section_ptr;
2541 else if (isym->st_shndx == SHN_COMMON)
2542 sym_sec = bfd_com_section_ptr;
2543 else
2544 sym_sec
2545 = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
2546
2547 sym_name
2548 = bfd_elf_string_from_elf_section (input_bfd,
2549 symtab_hdr->sh_link,
2550 isym->st_name);
2551
2552 /* Tack on an ID so we can uniquely identify this
2553 local symbol in the global hash table. */
2554 amt = strlen (sym_name) + 10;
2555 new_name = bfd_malloc (amt);
2556 if (new_name == NULL)
2557 goto error_return;
2558 sprintf (new_name, "%s_%08x", sym_name, sym_sec->id);
2559 sym_name = new_name;
2560
2561 elftab = & hash_table->static_hash_table->root;
2562 sym_hash = (struct elf32_mn10300_link_hash_entry *)
2563 elf_link_hash_lookup (elftab, sym_name,
2564 FALSE, FALSE, FALSE);
2565
2566 free (new_name);
2567 if (sym_hash == NULL)
2568 continue;
2569
2570 if (! (sym_hash->flags & MN10300_CONVERT_CALL_TO_CALLS)
2571 && ! (sym_hash->flags & MN10300_DELETED_PROLOGUE_BYTES))
2572 {
2573 int bytes = 0;
2574
2575 /* Note that we've changed things. */
2576 elf_section_data (section)->relocs = internal_relocs;
2577 elf_section_data (section)->this_hdr.contents = contents;
2578 symtab_hdr->contents = (unsigned char *) isymbuf;
2579
2580 /* Count how many bytes we're going to delete. */
2581 if (sym_hash->movm_args)
2582 bytes += 2;
2583
2584 if (sym_hash->stack_size > 0)
2585 {
2586 if (sym_hash->stack_size <= 128)
2587 bytes += 3;
2588 else
2589 bytes += 4;
2590 }
2591
2592 /* Note that we've deleted prologue bytes for this
2593 function. */
2594 sym_hash->flags |= MN10300_DELETED_PROLOGUE_BYTES;
2595
2596 /* Actually delete the bytes. */
2597 if (!mn10300_elf_relax_delete_bytes (input_bfd,
2598 section,
2599 isym->st_value,
2600 bytes))
2601 goto error_return;
2602
2603 /* Something changed. Not strictly necessary, but
2604 may lead to more relaxing opportunities. */
2605 *again = TRUE;
2606 }
2607 }
2608
2609 /* Look for any global functions in this section which
2610 need insns deleted from their prologues. */
2611 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
2612 - symtab_hdr->sh_info);
2613 hashes = elf_sym_hashes (input_bfd);
2614 end_hashes = hashes + symcount;
2615 for (; hashes < end_hashes; hashes++)
2616 {
2617 struct elf32_mn10300_link_hash_entry *sym_hash;
2618
2619 sym_hash = (struct elf32_mn10300_link_hash_entry *) *hashes;
2620 if ((sym_hash->root.root.type == bfd_link_hash_defined
2621 || sym_hash->root.root.type == bfd_link_hash_defweak)
2622 && sym_hash->root.root.u.def.section == section
2623 && ! (sym_hash->flags & MN10300_CONVERT_CALL_TO_CALLS)
2624 && ! (sym_hash->flags & MN10300_DELETED_PROLOGUE_BYTES))
2625 {
2626 int bytes = 0;
2627 bfd_vma symval;
2628
2629 /* Note that we've changed things. */
2630 elf_section_data (section)->relocs = internal_relocs;
2631 elf_section_data (section)->this_hdr.contents = contents;
2632 symtab_hdr->contents = (unsigned char *) isymbuf;
2633
2634 /* Count how many bytes we're going to delete. */
2635 if (sym_hash->movm_args)
2636 bytes += 2;
2637
2638 if (sym_hash->stack_size > 0)
2639 {
2640 if (sym_hash->stack_size <= 128)
2641 bytes += 3;
2642 else
2643 bytes += 4;
2644 }
2645
2646 /* Note that we've deleted prologue bytes for this
2647 function. */
2648 sym_hash->flags |= MN10300_DELETED_PROLOGUE_BYTES;
2649
2650 /* Actually delete the bytes. */
2651 symval = sym_hash->root.root.u.def.value;
2652 if (!mn10300_elf_relax_delete_bytes (input_bfd,
2653 section,
2654 symval,
2655 bytes))
2656 goto error_return;
2657
2658 /* Something changed. Not strictly necessary, but
2659 may lead to more relaxing opportunities. */
2660 *again = TRUE;
2661 }
2662 }
2663
2664 /* Cache or free any memory we allocated for the relocs. */
2665 if (internal_relocs != NULL
2666 && elf_section_data (section)->relocs != internal_relocs)
2667 free (internal_relocs);
2668 internal_relocs = NULL;
2669
2670 /* Cache or free any memory we allocated for the contents. */
2671 if (contents != NULL
2672 && elf_section_data (section)->this_hdr.contents != contents)
2673 {
2674 if (! link_info->keep_memory)
2675 free (contents);
2676 else
2677 /* Cache the section contents for elf_link_input_bfd. */
2678 elf_section_data (section)->this_hdr.contents = contents;
2679 }
2680 contents = NULL;
2681 }
2682
2683 /* Cache or free any memory we allocated for the symbols. */
2684 if (isymbuf != NULL
2685 && symtab_hdr->contents != (unsigned char *) isymbuf)
2686 {
2687 if (! link_info->keep_memory)
2688 free (isymbuf);
2689 else
2690 /* Cache the symbols for elf_link_input_bfd. */
2691 symtab_hdr->contents = (unsigned char *) isymbuf;
2692 }
2693 isymbuf = NULL;
2694 }
2695 }
2696
2697 /* (Re)initialize for the basic instruction shortening/relaxing pass. */
2698 contents = NULL;
2699 internal_relocs = NULL;
2700 isymbuf = NULL;
2701 /* For error_return. */
2702 section = sec;
2703
2704 /* We don't have to do anything for a relocatable link, if
2705 this section does not have relocs, or if this is not a
2706 code section. */
2707 if (link_info->relocatable
2708 || (sec->flags & SEC_RELOC) == 0
2709 || sec->reloc_count == 0
2710 || (sec->flags & SEC_CODE) == 0)
2711 return TRUE;
2712
2713 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2714
2715 /* Get a copy of the native relocations. */
2716 internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
2717 link_info->keep_memory);
2718 if (internal_relocs == NULL)
2719 goto error_return;
2720
2721 /* Walk through them looking for relaxing opportunities. */
2722 irelend = internal_relocs + sec->reloc_count;
2723 for (irel = internal_relocs; irel < irelend; irel++)
2724 {
2725 bfd_vma symval;
2726 struct elf32_mn10300_link_hash_entry *h = NULL;
2727
2728 /* If this isn't something that can be relaxed, then ignore
2729 this reloc. */
2730 if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_NONE
2731 || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_8
2732 || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_MAX)
2733 continue;
2734
2735 /* Get the section contents if we haven't done so already. */
2736 if (contents == NULL)
2737 {
2738 /* Get cached copy if it exists. */
2739 if (elf_section_data (sec)->this_hdr.contents != NULL)
2740 contents = elf_section_data (sec)->this_hdr.contents;
2741 else
2742 {
2743 /* Go get them off disk. */
2744 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2745 goto error_return;
2746 }
2747 }
2748
2749 /* Read this BFD's symbols if we haven't done so already. */
2750 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
2751 {
2752 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2753 if (isymbuf == NULL)
2754 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2755 symtab_hdr->sh_info, 0,
2756 NULL, NULL, NULL);
2757 if (isymbuf == NULL)
2758 goto error_return;
2759 }
2760
2761 /* Get the value of the symbol referred to by the reloc. */
2762 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2763 {
2764 Elf_Internal_Sym *isym;
2765 asection *sym_sec = NULL;
2766 const char *sym_name;
2767 char *new_name;
2768
2769 /* A local symbol. */
2770 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2771 if (isym->st_shndx == SHN_UNDEF)
2772 sym_sec = bfd_und_section_ptr;
2773 else if (isym->st_shndx == SHN_ABS)
2774 sym_sec = bfd_abs_section_ptr;
2775 else if (isym->st_shndx == SHN_COMMON)
2776 sym_sec = bfd_com_section_ptr;
2777 else
2778 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2779
2780 sym_name = bfd_elf_string_from_elf_section (abfd,
2781 symtab_hdr->sh_link,
2782 isym->st_name);
2783
2784 if ((sym_sec->flags & SEC_MERGE)
2785 && ELF_ST_TYPE (isym->st_info) == STT_SECTION
2786 && sym_sec->sec_info_type == ELF_INFO_TYPE_MERGE)
2787 {
2788 bfd_vma saved_addend;
2789
2790 saved_addend = irel->r_addend;
2791 symval = _bfd_elf_rela_local_sym (abfd, isym, & sym_sec, irel);
2792 symval += irel->r_addend;
2793 irel->r_addend = saved_addend;
2794 }
2795 else
2796 symval = (isym->st_value
2797 + sym_sec->output_section->vma
2798 + sym_sec->output_offset);
2799
2800 /* Tack on an ID so we can uniquely identify this
2801 local symbol in the global hash table. */
2802 new_name = bfd_malloc ((bfd_size_type) strlen (sym_name) + 10);
2803 if (new_name == NULL)
2804 goto error_return;
2805 sprintf (new_name, "%s_%08x", sym_name, sym_sec->id);
2806 sym_name = new_name;
2807
2808 h = (struct elf32_mn10300_link_hash_entry *)
2809 elf_link_hash_lookup (&hash_table->static_hash_table->root,
2810 sym_name, FALSE, FALSE, FALSE);
2811 free (new_name);
2812 }
2813 else
2814 {
2815 unsigned long indx;
2816
2817 /* An external symbol. */
2818 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2819 h = (struct elf32_mn10300_link_hash_entry *)
2820 (elf_sym_hashes (abfd)[indx]);
2821 BFD_ASSERT (h != NULL);
2822 if (h->root.root.type != bfd_link_hash_defined
2823 && h->root.root.type != bfd_link_hash_defweak)
2824 /* This appears to be a reference to an undefined
2825 symbol. Just ignore it--it will be caught by the
2826 regular reloc processing. */
2827 continue;
2828
2829 /* Check for a reference to a discarded symbol and ignore it. */
2830 if (h->root.root.u.def.section->output_section == NULL)
2831 continue;
2832
2833 symval = (h->root.root.u.def.value
2834 + h->root.root.u.def.section->output_section->vma
2835 + h->root.root.u.def.section->output_offset);
2836 }
2837
2838 /* For simplicity of coding, we are going to modify the section
2839 contents, the section relocs, and the BFD symbol table. We
2840 must tell the rest of the code not to free up this
2841 information. It would be possible to instead create a table
2842 of changes which have to be made, as is done in coff-mips.c;
2843 that would be more work, but would require less memory when
2844 the linker is run. */
2845
2846 /* Try to turn a 32bit pc-relative branch/call into a 16bit pc-relative
2847 branch/call, also deal with "call" -> "calls" conversions and
2848 insertion of prologue data into "call" instructions. */
2849 if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PCREL32
2850 || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PLT32)
2851 {
2852 bfd_vma value = symval;
2853
2854 if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PLT32
2855 && h != NULL
2856 && ELF_ST_VISIBILITY (h->root.other) != STV_INTERNAL
2857 && ELF_ST_VISIBILITY (h->root.other) != STV_HIDDEN
2858 && h->root.plt.offset != (bfd_vma) -1)
2859 {
2860 asection * splt;
2861
2862 splt = bfd_get_section_by_name (elf_hash_table (link_info)
2863 ->dynobj, ".plt");
2864
2865 value = ((splt->output_section->vma
2866 + splt->output_offset
2867 + h->root.plt.offset)
2868 - (sec->output_section->vma
2869 + sec->output_offset
2870 + irel->r_offset));
2871 }
2872
2873 /* If we've got a "call" instruction that needs to be turned
2874 into a "calls" instruction, do so now. It saves a byte. */
2875 if (h && (h->flags & MN10300_CONVERT_CALL_TO_CALLS))
2876 {
2877 unsigned char code;
2878
2879 /* Get the opcode. */
2880 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
2881
2882 /* Make sure we're working with a "call" instruction! */
2883 if (code == 0xdd)
2884 {
2885 /* Note that we've changed the relocs, section contents,
2886 etc. */
2887 elf_section_data (sec)->relocs = internal_relocs;
2888 elf_section_data (sec)->this_hdr.contents = contents;
2889 symtab_hdr->contents = (unsigned char *) isymbuf;
2890
2891 /* Fix the opcode. */
2892 bfd_put_8 (abfd, 0xfc, contents + irel->r_offset - 1);
2893 bfd_put_8 (abfd, 0xff, contents + irel->r_offset);
2894
2895 /* Fix irel->r_offset and irel->r_addend. */
2896 irel->r_offset += 1;
2897 irel->r_addend += 1;
2898
2899 /* Delete one byte of data. */
2900 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
2901 irel->r_offset + 3, 1))
2902 goto error_return;
2903
2904 /* That will change things, so, we should relax again.
2905 Note that this is not required, and it may be slow. */
2906 *again = TRUE;
2907 }
2908 }
2909 else if (h)
2910 {
2911 /* We've got a "call" instruction which needs some data
2912 from target function filled in. */
2913 unsigned char code;
2914
2915 /* Get the opcode. */
2916 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
2917
2918 /* Insert data from the target function into the "call"
2919 instruction if needed. */
2920 if (code == 0xdd)
2921 {
2922 bfd_put_8 (abfd, h->movm_args, contents + irel->r_offset + 4);
2923 bfd_put_8 (abfd, h->stack_size + h->movm_stack_size,
2924 contents + irel->r_offset + 5);
2925 }
2926 }
2927
2928 /* Deal with pc-relative gunk. */
2929 value -= (sec->output_section->vma + sec->output_offset);
2930 value -= irel->r_offset;
2931 value += irel->r_addend;
2932
2933 /* See if the value will fit in 16 bits, note the high value is
2934 0x7fff + 2 as the target will be two bytes closer if we are
2935 able to relax. */
2936 if ((long) value < 0x8001 && (long) value > -0x8000)
2937 {
2938 unsigned char code;
2939
2940 /* Get the opcode. */
2941 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
2942
2943 if (code != 0xdc && code != 0xdd && code != 0xff)
2944 continue;
2945
2946 /* Note that we've changed the relocs, section contents, etc. */
2947 elf_section_data (sec)->relocs = internal_relocs;
2948 elf_section_data (sec)->this_hdr.contents = contents;
2949 symtab_hdr->contents = (unsigned char *) isymbuf;
2950
2951 /* Fix the opcode. */
2952 if (code == 0xdc)
2953 bfd_put_8 (abfd, 0xcc, contents + irel->r_offset - 1);
2954 else if (code == 0xdd)
2955 bfd_put_8 (abfd, 0xcd, contents + irel->r_offset - 1);
2956 else if (code == 0xff)
2957 bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2);
2958
2959 /* Fix the relocation's type. */
2960 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
2961 (ELF32_R_TYPE (irel->r_info)
2962 == (int) R_MN10300_PLT32)
2963 ? R_MN10300_PLT16 :
2964 R_MN10300_PCREL16);
2965
2966 /* Delete two bytes of data. */
2967 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
2968 irel->r_offset + 1, 2))
2969 goto error_return;
2970
2971 /* That will change things, so, we should relax again.
2972 Note that this is not required, and it may be slow. */
2973 *again = TRUE;
2974 }
2975 }
2976
2977 /* Try to turn a 16bit pc-relative branch into a 8bit pc-relative
2978 branch. */
2979 if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PCREL16)
2980 {
2981 bfd_vma value = symval;
2982
2983 /* If we've got a "call" instruction that needs to be turned
2984 into a "calls" instruction, do so now. It saves a byte. */
2985 if (h && (h->flags & MN10300_CONVERT_CALL_TO_CALLS))
2986 {
2987 unsigned char code;
2988
2989 /* Get the opcode. */
2990 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
2991
2992 /* Make sure we're working with a "call" instruction! */
2993 if (code == 0xcd)
2994 {
2995 /* Note that we've changed the relocs, section contents,
2996 etc. */
2997 elf_section_data (sec)->relocs = internal_relocs;
2998 elf_section_data (sec)->this_hdr.contents = contents;
2999 symtab_hdr->contents = (unsigned char *) isymbuf;
3000
3001 /* Fix the opcode. */
3002 bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 1);
3003 bfd_put_8 (abfd, 0xff, contents + irel->r_offset);
3004
3005 /* Fix irel->r_offset and irel->r_addend. */
3006 irel->r_offset += 1;
3007 irel->r_addend += 1;
3008
3009 /* Delete one byte of data. */
3010 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
3011 irel->r_offset + 1, 1))
3012 goto error_return;
3013
3014 /* That will change things, so, we should relax again.
3015 Note that this is not required, and it may be slow. */
3016 *again = TRUE;
3017 }
3018 }
3019 else if (h)
3020 {
3021 unsigned char code;
3022
3023 /* Get the opcode. */
3024 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
3025
3026 /* Insert data from the target function into the "call"
3027 instruction if needed. */
3028 if (code == 0xcd)
3029 {
3030 bfd_put_8 (abfd, h->movm_args, contents + irel->r_offset + 2);
3031 bfd_put_8 (abfd, h->stack_size + h->movm_stack_size,
3032 contents + irel->r_offset + 3);
3033 }
3034 }
3035
3036 /* Deal with pc-relative gunk. */
3037 value -= (sec->output_section->vma + sec->output_offset);
3038 value -= irel->r_offset;
3039 value += irel->r_addend;
3040
3041 /* See if the value will fit in 8 bits, note the high value is
3042 0x7f + 1 as the target will be one bytes closer if we are
3043 able to relax. */
3044 if ((long) value < 0x80 && (long) value > -0x80)
3045 {
3046 unsigned char code;
3047
3048 /* Get the opcode. */
3049 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
3050
3051 if (code != 0xcc)
3052 continue;
3053
3054 /* Note that we've changed the relocs, section contents, etc. */
3055 elf_section_data (sec)->relocs = internal_relocs;
3056 elf_section_data (sec)->this_hdr.contents = contents;
3057 symtab_hdr->contents = (unsigned char *) isymbuf;
3058
3059 /* Fix the opcode. */
3060 bfd_put_8 (abfd, 0xca, contents + irel->r_offset - 1);
3061
3062 /* Fix the relocation's type. */
3063 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
3064 R_MN10300_PCREL8);
3065
3066 /* Delete one byte of data. */
3067 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
3068 irel->r_offset + 1, 1))
3069 goto error_return;
3070
3071 /* That will change things, so, we should relax again.
3072 Note that this is not required, and it may be slow. */
3073 *again = TRUE;
3074 }
3075 }
3076
3077 /* Try to eliminate an unconditional 8 bit pc-relative branch
3078 which immediately follows a conditional 8 bit pc-relative
3079 branch around the unconditional branch.
3080
3081 original: new:
3082 bCC lab1 bCC' lab2
3083 bra lab2
3084 lab1: lab1:
3085
3086 This happens when the bCC can't reach lab2 at assembly time,
3087 but due to other relaxations it can reach at link time. */
3088 if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PCREL8)
3089 {
3090 Elf_Internal_Rela *nrel;
3091 bfd_vma value = symval;
3092 unsigned char code;
3093
3094 /* Deal with pc-relative gunk. */
3095 value -= (sec->output_section->vma + sec->output_offset);
3096 value -= irel->r_offset;
3097 value += irel->r_addend;
3098
3099 /* Do nothing if this reloc is the last byte in the section. */
3100 if (irel->r_offset == sec->size)
3101 continue;
3102
3103 /* See if the next instruction is an unconditional pc-relative
3104 branch, more often than not this test will fail, so we
3105 test it first to speed things up. */
3106 code = bfd_get_8 (abfd, contents + irel->r_offset + 1);
3107 if (code != 0xca)
3108 continue;
3109
3110 /* Also make sure the next relocation applies to the next
3111 instruction and that it's a pc-relative 8 bit branch. */
3112 nrel = irel + 1;
3113 if (nrel == irelend
3114 || irel->r_offset + 2 != nrel->r_offset
3115 || ELF32_R_TYPE (nrel->r_info) != (int) R_MN10300_PCREL8)
3116 continue;
3117
3118 /* Make sure our destination immediately follows the
3119 unconditional branch. */
3120 if (symval != (sec->output_section->vma + sec->output_offset
3121 + irel->r_offset + 3))
3122 continue;
3123
3124 /* Now make sure we are a conditional branch. This may not
3125 be necessary, but why take the chance.
3126
3127 Note these checks assume that R_MN10300_PCREL8 relocs
3128 only occur on bCC and bCCx insns. If they occured
3129 elsewhere, we'd need to know the start of this insn
3130 for this check to be accurate. */
3131 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
3132 if (code != 0xc0 && code != 0xc1 && code != 0xc2
3133 && code != 0xc3 && code != 0xc4 && code != 0xc5
3134 && code != 0xc6 && code != 0xc7 && code != 0xc8
3135 && code != 0xc9 && code != 0xe8 && code != 0xe9
3136 && code != 0xea && code != 0xeb)
3137 continue;
3138
3139 /* We also have to be sure there is no symbol/label
3140 at the unconditional branch. */
3141 if (mn10300_elf_symbol_address_p (abfd, sec, isymbuf,
3142 irel->r_offset + 1))
3143 continue;
3144
3145 /* Note that we've changed the relocs, section contents, etc. */
3146 elf_section_data (sec)->relocs = internal_relocs;
3147 elf_section_data (sec)->this_hdr.contents = contents;
3148 symtab_hdr->contents = (unsigned char *) isymbuf;
3149
3150 /* Reverse the condition of the first branch. */
3151 switch (code)
3152 {
3153 case 0xc8:
3154 code = 0xc9;
3155 break;
3156 case 0xc9:
3157 code = 0xc8;
3158 break;
3159 case 0xc0:
3160 code = 0xc2;
3161 break;
3162 case 0xc2:
3163 code = 0xc0;
3164 break;
3165 case 0xc3:
3166 code = 0xc1;
3167 break;
3168 case 0xc1:
3169 code = 0xc3;
3170 break;
3171 case 0xc4:
3172 code = 0xc6;
3173 break;
3174 case 0xc6:
3175 code = 0xc4;
3176 break;
3177 case 0xc7:
3178 code = 0xc5;
3179 break;
3180 case 0xc5:
3181 code = 0xc7;
3182 break;
3183 case 0xe8:
3184 code = 0xe9;
3185 break;
3186 case 0x9d:
3187 code = 0xe8;
3188 break;
3189 case 0xea:
3190 code = 0xeb;
3191 break;
3192 case 0xeb:
3193 code = 0xea;
3194 break;
3195 }
3196 bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
3197
3198 /* Set the reloc type and symbol for the first branch
3199 from the second branch. */
3200 irel->r_info = nrel->r_info;
3201
3202 /* Make the reloc for the second branch a null reloc. */
3203 nrel->r_info = ELF32_R_INFO (ELF32_R_SYM (nrel->r_info),
3204 R_MN10300_NONE);
3205
3206 /* Delete two bytes of data. */
3207 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
3208 irel->r_offset + 1, 2))
3209 goto error_return;
3210
3211 /* That will change things, so, we should relax again.
3212 Note that this is not required, and it may be slow. */
3213 *again = TRUE;
3214 }
3215
3216 /* Try to turn a 24 immediate, displacement or absolute address
3217 into a 8 immediate, displacement or absolute address. */
3218 if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_24)
3219 {
3220 bfd_vma value = symval;
3221 value += irel->r_addend;
3222
3223 /* See if the value will fit in 8 bits. */
3224 if ((long) value < 0x7f && (long) value > -0x80)
3225 {
3226 unsigned char code;
3227
3228 /* AM33 insns which have 24 operands are 6 bytes long and
3229 will have 0xfd as the first byte. */
3230
3231 /* Get the first opcode. */
3232 code = bfd_get_8 (abfd, contents + irel->r_offset - 3);
3233
3234 if (code == 0xfd)
3235 {
3236 /* Get the second opcode. */
3237 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
3238
3239 /* We can not relax 0x6b, 0x7b, 0x8b, 0x9b as no 24bit
3240 equivalent instructions exists. */
3241 if (code != 0x6b && code != 0x7b
3242 && code != 0x8b && code != 0x9b
3243 && ((code & 0x0f) == 0x09 || (code & 0x0f) == 0x08
3244 || (code & 0x0f) == 0x0a || (code & 0x0f) == 0x0b
3245 || (code & 0x0f) == 0x0e))
3246 {
3247 /* Not safe if the high bit is on as relaxing may
3248 move the value out of high mem and thus not fit
3249 in a signed 8bit value. This is currently over
3250 conservative. */
3251 if ((value & 0x80) == 0)
3252 {
3253 /* Note that we've changed the relocation contents,
3254 etc. */
3255 elf_section_data (sec)->relocs = internal_relocs;
3256 elf_section_data (sec)->this_hdr.contents = contents;
3257 symtab_hdr->contents = (unsigned char *) isymbuf;
3258
3259 /* Fix the opcode. */
3260 bfd_put_8 (abfd, 0xfb, contents + irel->r_offset - 3);
3261 bfd_put_8 (abfd, code, contents + irel->r_offset - 2);
3262
3263 /* Fix the relocation's type. */
3264 irel->r_info =
3265 ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
3266 R_MN10300_8);
3267
3268 /* Delete two bytes of data. */
3269 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
3270 irel->r_offset + 1, 2))
3271 goto error_return;
3272
3273 /* That will change things, so, we should relax
3274 again. Note that this is not required, and it
3275 may be slow. */
3276 *again = TRUE;
3277 break;
3278 }
3279 }
3280 }
3281 }
3282 }
3283
3284 /* Try to turn a 32bit immediate, displacement or absolute address
3285 into a 16bit immediate, displacement or absolute address. */
3286 if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_32
3287 || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOT32
3288 || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTOFF32)
3289 {
3290 bfd_vma value = symval;
3291
3292 if (ELF32_R_TYPE (irel->r_info) != (int) R_MN10300_32)
3293 {
3294 asection * sgot;
3295
3296 sgot = bfd_get_section_by_name (elf_hash_table (link_info)
3297 ->dynobj, ".got");
3298
3299 if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOT32)
3300 {
3301 value = sgot->output_offset;
3302
3303 if (h)
3304 value += h->root.got.offset;
3305 else
3306 value += (elf_local_got_offsets
3307 (abfd)[ELF32_R_SYM (irel->r_info)]);
3308 }
3309 else if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTOFF32)
3310 value -= sgot->output_section->vma;
3311 else if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_GOTPC32)
3312 value = (sgot->output_section->vma
3313 - (sec->output_section->vma
3314 + sec->output_offset
3315 + irel->r_offset));
3316 else
3317 abort ();
3318 }
3319
3320 value += irel->r_addend;
3321
3322 /* See if the value will fit in 24 bits.
3323 We allow any 16bit match here. We prune those we can't
3324 handle below. */
3325 if ((long) value < 0x7fffff && (long) value > -0x800000)
3326 {
3327 unsigned char code;
3328
3329 /* AM33 insns which have 32bit operands are 7 bytes long and
3330 will have 0xfe as the first byte. */
3331
3332 /* Get the first opcode. */
3333 code = bfd_get_8 (abfd, contents + irel->r_offset - 3);
3334
3335 if (code == 0xfe)
3336 {
3337 /* Get the second opcode. */
3338 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
3339
3340 /* All the am33 32 -> 24 relaxing possibilities. */
3341 /* We can not relax 0x6b, 0x7b, 0x8b, 0x9b as no 24bit
3342 equivalent instructions exists. */
3343 if (code != 0x6b && code != 0x7b
3344 && code != 0x8b && code != 0x9b
3345 && (ELF32_R_TYPE (irel->r_info)
3346 != (int) R_MN10300_GOTPC32)
3347 && ((code & 0x0f) == 0x09 || (code & 0x0f) == 0x08
3348 || (code & 0x0f) == 0x0a || (code & 0x0f) == 0x0b
3349 || (code & 0x0f) == 0x0e))
3350 {
3351 /* Not safe if the high bit is on as relaxing may
3352 move the value out of high mem and thus not fit
3353 in a signed 16bit value. This is currently over
3354 conservative. */
3355 if ((value & 0x8000) == 0)
3356 {
3357 /* Note that we've changed the relocation contents,
3358 etc. */
3359 elf_section_data (sec)->relocs = internal_relocs;
3360 elf_section_data (sec)->this_hdr.contents = contents;
3361 symtab_hdr->contents = (unsigned char *) isymbuf;
3362
3363 /* Fix the opcode. */
3364 bfd_put_8 (abfd, 0xfd, contents + irel->r_offset - 3);
3365 bfd_put_8 (abfd, code, contents + irel->r_offset - 2);
3366
3367 /* Fix the relocation's type. */
3368 irel->r_info =
3369 ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
3370 (ELF32_R_TYPE (irel->r_info)
3371 == (int) R_MN10300_GOTOFF32)
3372 ? R_MN10300_GOTOFF24
3373 : (ELF32_R_TYPE (irel->r_info)
3374 == (int) R_MN10300_GOT32)
3375 ? R_MN10300_GOT24 :
3376 R_MN10300_24);
3377
3378 /* Delete one byte of data. */
3379 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
3380 irel->r_offset + 3, 1))
3381 goto error_return;
3382
3383 /* That will change things, so, we should relax
3384 again. Note that this is not required, and it
3385 may be slow. */
3386 *again = TRUE;
3387 break;
3388 }
3389 }
3390 }
3391 }
3392
3393 /* See if the value will fit in 16 bits.
3394 We allow any 16bit match here. We prune those we can't
3395 handle below. */
3396 if ((long) value < 0x7fff && (long) value > -0x8000)
3397 {
3398 unsigned char code;
3399
3400 /* Most insns which have 32bit operands are 6 bytes long;
3401 exceptions are pcrel insns and bit insns.
3402
3403 We handle pcrel insns above. We don't bother trying
3404 to handle the bit insns here.
3405
3406 The first byte of the remaining insns will be 0xfc. */
3407
3408 /* Get the first opcode. */
3409 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
3410
3411 if (code != 0xfc)
3412 continue;
3413
3414 /* Get the second opcode. */
3415 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
3416
3417 if ((code & 0xf0) < 0x80)
3418 switch (code & 0xf0)
3419 {
3420 /* mov (d32,am),dn -> mov (d32,am),dn
3421 mov dm,(d32,am) -> mov dn,(d32,am)
3422 mov (d32,am),an -> mov (d32,am),an
3423 mov dm,(d32,am) -> mov dn,(d32,am)
3424 movbu (d32,am),dn -> movbu (d32,am),dn
3425 movbu dm,(d32,am) -> movbu dn,(d32,am)
3426 movhu (d32,am),dn -> movhu (d32,am),dn
3427 movhu dm,(d32,am) -> movhu dn,(d32,am) */
3428 case 0x00:
3429 case 0x10:
3430 case 0x20:
3431 case 0x30:
3432 case 0x40:
3433 case 0x50:
3434 case 0x60:
3435 case 0x70:
3436 /* Not safe if the high bit is on as relaxing may
3437 move the value out of high mem and thus not fit
3438 in a signed 16bit value. */
3439 if (code == 0xcc
3440 && (value & 0x8000))
3441 continue;
3442
3443 /* Note that we've changed the relocation contents, etc. */
3444 elf_section_data (sec)->relocs = internal_relocs;
3445 elf_section_data (sec)->this_hdr.contents = contents;
3446 symtab_hdr->contents = (unsigned char *) isymbuf;
3447
3448 /* Fix the opcode. */
3449 bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2);
3450 bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
3451
3452 /* Fix the relocation's type. */
3453 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
3454 (ELF32_R_TYPE (irel->r_info)
3455 == (int) R_MN10300_GOTOFF32)
3456 ? R_MN10300_GOTOFF16
3457 : (ELF32_R_TYPE (irel->r_info)
3458 == (int) R_MN10300_GOT32)
3459 ? R_MN10300_GOT16
3460 : (ELF32_R_TYPE (irel->r_info)
3461 == (int) R_MN10300_GOTPC32)
3462 ? R_MN10300_GOTPC16 :
3463 R_MN10300_16);
3464
3465 /* Delete two bytes of data. */
3466 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
3467 irel->r_offset + 2, 2))
3468 goto error_return;
3469
3470 /* That will change things, so, we should relax again.
3471 Note that this is not required, and it may be slow. */
3472 *again = TRUE;
3473 break;
3474 }
3475 else if ((code & 0xf0) == 0x80
3476 || (code & 0xf0) == 0x90)
3477 switch (code & 0xf3)
3478 {
3479 /* mov dn,(abs32) -> mov dn,(abs16)
3480 movbu dn,(abs32) -> movbu dn,(abs16)
3481 movhu dn,(abs32) -> movhu dn,(abs16) */
3482 case 0x81:
3483 case 0x82:
3484 case 0x83:
3485 /* Note that we've changed the relocation contents, etc. */
3486 elf_section_data (sec)->relocs = internal_relocs;
3487 elf_section_data (sec)->this_hdr.contents = contents;
3488 symtab_hdr->contents = (unsigned char *) isymbuf;
3489
3490 if ((code & 0xf3) == 0x81)
3491 code = 0x01 + (code & 0x0c);
3492 else if ((code & 0xf3) == 0x82)
3493 code = 0x02 + (code & 0x0c);
3494 else if ((code & 0xf3) == 0x83)
3495 code = 0x03 + (code & 0x0c);
3496 else
3497 abort ();
3498
3499 /* Fix the opcode. */
3500 bfd_put_8 (abfd, code, contents + irel->r_offset - 2);
3501
3502 /* Fix the relocation's type. */
3503 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
3504 (ELF32_R_TYPE (irel->r_info)
3505 == (int) R_MN10300_GOTOFF32)
3506 ? R_MN10300_GOTOFF16
3507 : (ELF32_R_TYPE (irel->r_info)
3508 == (int) R_MN10300_GOT32)
3509 ? R_MN10300_GOT16
3510 : (ELF32_R_TYPE (irel->r_info)
3511 == (int) R_MN10300_GOTPC32)
3512 ? R_MN10300_GOTPC16 :
3513 R_MN10300_16);
3514
3515 /* The opcode got shorter too, so we have to fix the
3516 addend and offset too! */
3517 irel->r_offset -= 1;
3518
3519 /* Delete three bytes of data. */
3520 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
3521 irel->r_offset + 1, 3))
3522 goto error_return;
3523
3524 /* That will change things, so, we should relax again.
3525 Note that this is not required, and it may be slow. */
3526 *again = TRUE;
3527 break;
3528
3529 /* mov am,(abs32) -> mov am,(abs16)
3530 mov am,(d32,sp) -> mov am,(d16,sp)
3531 mov dm,(d32,sp) -> mov dm,(d32,sp)
3532 movbu dm,(d32,sp) -> movbu dm,(d32,sp)
3533 movhu dm,(d32,sp) -> movhu dm,(d32,sp) */
3534 case 0x80:
3535 case 0x90:
3536 case 0x91:
3537 case 0x92:
3538 case 0x93:
3539 /* sp-based offsets are zero-extended. */
3540 if (code >= 0x90 && code <= 0x93
3541 && (long) value < 0)
3542 continue;
3543
3544 /* Note that we've changed the relocation contents, etc. */
3545 elf_section_data (sec)->relocs = internal_relocs;
3546 elf_section_data (sec)->this_hdr.contents = contents;
3547 symtab_hdr->contents = (unsigned char *) isymbuf;
3548
3549 /* Fix the opcode. */
3550 bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2);
3551 bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
3552
3553 /* Fix the relocation's type. */
3554 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
3555 (ELF32_R_TYPE (irel->r_info)
3556 == (int) R_MN10300_GOTOFF32)
3557 ? R_MN10300_GOTOFF16
3558 : (ELF32_R_TYPE (irel->r_info)
3559 == (int) R_MN10300_GOT32)
3560 ? R_MN10300_GOT16
3561 : (ELF32_R_TYPE (irel->r_info)
3562 == (int) R_MN10300_GOTPC32)
3563 ? R_MN10300_GOTPC16 :
3564 R_MN10300_16);
3565
3566 /* Delete two bytes of data. */
3567 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
3568 irel->r_offset + 2, 2))
3569 goto error_return;
3570
3571 /* That will change things, so, we should relax again.
3572 Note that this is not required, and it may be slow. */
3573 *again = TRUE;
3574 break;
3575 }
3576 else if ((code & 0xf0) < 0xf0)
3577 switch (code & 0xfc)
3578 {
3579 /* mov imm32,dn -> mov imm16,dn
3580 mov imm32,an -> mov imm16,an
3581 mov (abs32),dn -> mov (abs16),dn
3582 movbu (abs32),dn -> movbu (abs16),dn
3583 movhu (abs32),dn -> movhu (abs16),dn */
3584 case 0xcc:
3585 case 0xdc:
3586 case 0xa4:
3587 case 0xa8:
3588 case 0xac:
3589 /* Not safe if the high bit is on as relaxing may
3590 move the value out of high mem and thus not fit
3591 in a signed 16bit value. */
3592 if (code == 0xcc
3593 && (value & 0x8000))
3594 continue;
3595
3596 /* mov imm16, an zero-extends the immediate. */
3597 if (code == 0xdc
3598 && (long) value < 0)
3599 continue;
3600
3601 /* Note that we've changed the relocation contents, etc. */
3602 elf_section_data (sec)->relocs = internal_relocs;
3603 elf_section_data (sec)->this_hdr.contents = contents;
3604 symtab_hdr->contents = (unsigned char *) isymbuf;
3605
3606 if ((code & 0xfc) == 0xcc)
3607 code = 0x2c + (code & 0x03);
3608 else if ((code & 0xfc) == 0xdc)
3609 code = 0x24 + (code & 0x03);
3610 else if ((code & 0xfc) == 0xa4)
3611 code = 0x30 + (code & 0x03);
3612 else if ((code & 0xfc) == 0xa8)
3613 code = 0x34 + (code & 0x03);
3614 else if ((code & 0xfc) == 0xac)
3615 code = 0x38 + (code & 0x03);
3616 else
3617 abort ();
3618
3619 /* Fix the opcode. */
3620 bfd_put_8 (abfd, code, contents + irel->r_offset - 2);
3621
3622 /* Fix the relocation's type. */
3623 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
3624 (ELF32_R_TYPE (irel->r_info)
3625 == (int) R_MN10300_GOTOFF32)
3626 ? R_MN10300_GOTOFF16
3627 : (ELF32_R_TYPE (irel->r_info)
3628 == (int) R_MN10300_GOT32)
3629 ? R_MN10300_GOT16
3630 : (ELF32_R_TYPE (irel->r_info)
3631 == (int) R_MN10300_GOTPC32)
3632 ? R_MN10300_GOTPC16 :
3633 R_MN10300_16);
3634
3635 /* The opcode got shorter too, so we have to fix the
3636 addend and offset too! */
3637 irel->r_offset -= 1;
3638
3639 /* Delete three bytes of data. */
3640 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
3641 irel->r_offset + 1, 3))
3642 goto error_return;
3643
3644 /* That will change things, so, we should relax again.
3645 Note that this is not required, and it may be slow. */
3646 *again = TRUE;
3647 break;
3648
3649 /* mov (abs32),an -> mov (abs16),an
3650 mov (d32,sp),an -> mov (d16,sp),an
3651 mov (d32,sp),dn -> mov (d16,sp),dn
3652 movbu (d32,sp),dn -> movbu (d16,sp),dn
3653 movhu (d32,sp),dn -> movhu (d16,sp),dn
3654 add imm32,dn -> add imm16,dn
3655 cmp imm32,dn -> cmp imm16,dn
3656 add imm32,an -> add imm16,an
3657 cmp imm32,an -> cmp imm16,an
3658 and imm32,dn -> and imm16,dn
3659 or imm32,dn -> or imm16,dn
3660 xor imm32,dn -> xor imm16,dn
3661 btst imm32,dn -> btst imm16,dn */
3662
3663 case 0xa0:
3664 case 0xb0:
3665 case 0xb1:
3666 case 0xb2:
3667 case 0xb3:
3668 case 0xc0:
3669 case 0xc8:
3670
3671 case 0xd0:
3672 case 0xd8:
3673 case 0xe0:
3674 case 0xe1:
3675 case 0xe2:
3676 case 0xe3:
3677 /* cmp imm16, an zero-extends the immediate. */
3678 if (code == 0xdc
3679 && (long) value < 0)
3680 continue;
3681
3682 /* So do sp-based offsets. */
3683 if (code >= 0xb0 && code <= 0xb3
3684 && (long) value < 0)
3685 continue;
3686
3687 /* Note that we've changed the relocation contents, etc. */
3688 elf_section_data (sec)->relocs = internal_relocs;
3689 elf_section_data (sec)->this_hdr.contents = contents;
3690 symtab_hdr->contents = (unsigned char *) isymbuf;
3691
3692 /* Fix the opcode. */
3693 bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2);
3694 bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
3695
3696 /* Fix the relocation's type. */
3697 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
3698 (ELF32_R_TYPE (irel->r_info)
3699 == (int) R_MN10300_GOTOFF32)
3700 ? R_MN10300_GOTOFF16
3701 : (ELF32_R_TYPE (irel->r_info)
3702 == (int) R_MN10300_GOT32)
3703 ? R_MN10300_GOT16
3704 : (ELF32_R_TYPE (irel->r_info)
3705 == (int) R_MN10300_GOTPC32)
3706 ? R_MN10300_GOTPC16 :
3707 R_MN10300_16);
3708
3709 /* Delete two bytes of data. */
3710 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
3711 irel->r_offset + 2, 2))
3712 goto error_return;
3713
3714 /* That will change things, so, we should relax again.
3715 Note that this is not required, and it may be slow. */
3716 *again = TRUE;
3717 break;
3718 }
3719 else if (code == 0xfe)
3720 {
3721 /* add imm32,sp -> add imm16,sp */
3722
3723 /* Note that we've changed the relocation contents, etc. */
3724 elf_section_data (sec)->relocs = internal_relocs;
3725 elf_section_data (sec)->this_hdr.contents = contents;
3726 symtab_hdr->contents = (unsigned char *) isymbuf;
3727
3728 /* Fix the opcode. */
3729 bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2);
3730 bfd_put_8 (abfd, 0xfe, contents + irel->r_offset - 1);
3731
3732 /* Fix the relocation's type. */
3733 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
3734 (ELF32_R_TYPE (irel->r_info)
3735 == (int) R_MN10300_GOT32)
3736 ? R_MN10300_GOT16
3737 : (ELF32_R_TYPE (irel->r_info)
3738 == (int) R_MN10300_GOTOFF32)
3739 ? R_MN10300_GOTOFF16
3740 : (ELF32_R_TYPE (irel->r_info)
3741 == (int) R_MN10300_GOTPC32)
3742 ? R_MN10300_GOTPC16 :
3743 R_MN10300_16);
3744
3745 /* Delete two bytes of data. */
3746 if (!mn10300_elf_relax_delete_bytes (abfd, sec,
3747 irel->r_offset + 2, 2))
3748 goto error_return;
3749
3750 /* That will change things, so, we should relax again.
3751 Note that this is not required, and it may be slow. */
3752 *again = TRUE;
3753 break;
3754 }
3755 }
3756 }
3757 }
3758
3759 if (isymbuf != NULL
3760 && symtab_hdr->contents != (unsigned char *) isymbuf)
3761 {
3762 if (! link_info->keep_memory)
3763 free (isymbuf);
3764 else
3765 {
3766 /* Cache the symbols for elf_link_input_bfd. */
3767 symtab_hdr->contents = (unsigned char *) isymbuf;
3768 }
3769 }
3770
3771 if (contents != NULL
3772 && elf_section_data (sec)->this_hdr.contents != contents)
3773 {
3774 if (! link_info->keep_memory)
3775 free (contents);
3776 else
3777 {
3778 /* Cache the section contents for elf_link_input_bfd. */
3779 elf_section_data (sec)->this_hdr.contents = contents;
3780 }
3781 }
3782
3783 if (internal_relocs != NULL
3784 && elf_section_data (sec)->relocs != internal_relocs)
3785 free (internal_relocs);
3786
3787 return TRUE;
3788
3789 error_return:
3790 if (isymbuf != NULL
3791 && symtab_hdr->contents != (unsigned char *) isymbuf)
3792 free (isymbuf);
3793 if (contents != NULL
3794 && elf_section_data (section)->this_hdr.contents != contents)
3795 free (contents);
3796 if (internal_relocs != NULL
3797 && elf_section_data (section)->relocs != internal_relocs)
3798 free (internal_relocs);
3799
3800 return FALSE;
3801 }
3802
3803 /* This is a version of bfd_generic_get_relocated_section_contents
3804 which uses mn10300_elf_relocate_section. */
3805
3806 static bfd_byte *
3807 mn10300_elf_get_relocated_section_contents (bfd *output_bfd,
3808 struct bfd_link_info *link_info,
3809 struct bfd_link_order *link_order,
3810 bfd_byte *data,
3811 bfd_boolean relocatable,
3812 asymbol **symbols)
3813 {
3814 Elf_Internal_Shdr *symtab_hdr;
3815 asection *input_section = link_order->u.indirect.section;
3816 bfd *input_bfd = input_section->owner;
3817 asection **sections = NULL;
3818 Elf_Internal_Rela *internal_relocs = NULL;
3819 Elf_Internal_Sym *isymbuf = NULL;
3820
3821 /* We only need to handle the case of relaxing, or of having a
3822 particular set of section contents, specially. */
3823 if (relocatable
3824 || elf_section_data (input_section)->this_hdr.contents == NULL)
3825 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
3826 link_order, data,
3827 relocatable,
3828 symbols);
3829
3830 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3831
3832 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
3833 (size_t) input_section->size);
3834
3835 if ((input_section->flags & SEC_RELOC) != 0
3836 && input_section->reloc_count > 0)
3837 {
3838 asection **secpp;
3839 Elf_Internal_Sym *isym, *isymend;
3840 bfd_size_type amt;
3841
3842 internal_relocs = _bfd_elf_link_read_relocs (input_bfd, input_section,
3843 NULL, NULL, FALSE);
3844 if (internal_relocs == NULL)
3845 goto error_return;
3846
3847 if (symtab_hdr->sh_info != 0)
3848 {
3849 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
3850 if (isymbuf == NULL)
3851 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
3852 symtab_hdr->sh_info, 0,
3853 NULL, NULL, NULL);
3854 if (isymbuf == NULL)
3855 goto error_return;
3856 }
3857
3858 amt = symtab_hdr->sh_info;
3859 amt *= sizeof (asection *);
3860 sections = bfd_malloc (amt);
3861 if (sections == NULL && amt != 0)
3862 goto error_return;
3863
3864 isymend = isymbuf + symtab_hdr->sh_info;
3865 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
3866 {
3867 asection *isec;
3868
3869 if (isym->st_shndx == SHN_UNDEF)
3870 isec = bfd_und_section_ptr;
3871 else if (isym->st_shndx == SHN_ABS)
3872 isec = bfd_abs_section_ptr;
3873 else if (isym->st_shndx == SHN_COMMON)
3874 isec = bfd_com_section_ptr;
3875 else
3876 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
3877
3878 *secpp = isec;
3879 }
3880
3881 if (! mn10300_elf_relocate_section (output_bfd, link_info, input_bfd,
3882 input_section, data, internal_relocs,
3883 isymbuf, sections))
3884 goto error_return;
3885
3886 if (sections != NULL)
3887 free (sections);
3888 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
3889 free (isymbuf);
3890 if (internal_relocs != elf_section_data (input_section)->relocs)
3891 free (internal_relocs);
3892 }
3893
3894 return data;
3895
3896 error_return:
3897 if (sections != NULL)
3898 free (sections);
3899 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
3900 free (isymbuf);
3901 if (internal_relocs != NULL
3902 && internal_relocs != elf_section_data (input_section)->relocs)
3903 free (internal_relocs);
3904 return NULL;
3905 }
3906
3907 /* Assorted hash table functions. */
3908
3909 /* Initialize an entry in the link hash table. */
3910
3911 /* Create an entry in an MN10300 ELF linker hash table. */
3912
3913 static struct bfd_hash_entry *
3914 elf32_mn10300_link_hash_newfunc (struct bfd_hash_entry *entry,
3915 struct bfd_hash_table *table,
3916 const char *string)
3917 {
3918 struct elf32_mn10300_link_hash_entry *ret =
3919 (struct elf32_mn10300_link_hash_entry *) entry;
3920
3921 /* Allocate the structure if it has not already been allocated by a
3922 subclass. */
3923 if (ret == NULL)
3924 ret = (struct elf32_mn10300_link_hash_entry *)
3925 bfd_hash_allocate (table, sizeof (* ret));
3926 if (ret == NULL)
3927 return (struct bfd_hash_entry *) ret;
3928
3929 /* Call the allocation method of the superclass. */
3930 ret = (struct elf32_mn10300_link_hash_entry *)
3931 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
3932 table, string);
3933 if (ret != NULL)
3934 {
3935 ret->direct_calls = 0;
3936 ret->stack_size = 0;
3937 ret->movm_args = 0;
3938 ret->movm_stack_size = 0;
3939 ret->flags = 0;
3940 ret->value = 0;
3941 }
3942
3943 return (struct bfd_hash_entry *) ret;
3944 }
3945
3946 /* Create an mn10300 ELF linker hash table. */
3947
3948 static struct bfd_link_hash_table *
3949 elf32_mn10300_link_hash_table_create (bfd *abfd)
3950 {
3951 struct elf32_mn10300_link_hash_table *ret;
3952 bfd_size_type amt = sizeof (* ret);
3953
3954 ret = bfd_malloc (amt);
3955 if (ret == NULL)
3956 return NULL;
3957
3958 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd,
3959 elf32_mn10300_link_hash_newfunc,
3960 sizeof (struct elf32_mn10300_link_hash_entry)))
3961 {
3962 free (ret);
3963 return NULL;
3964 }
3965
3966 ret->flags = 0;
3967 amt = sizeof (struct elf_link_hash_table);
3968 ret->static_hash_table = bfd_malloc (amt);
3969 if (ret->static_hash_table == NULL)
3970 {
3971 free (ret);
3972 return NULL;
3973 }
3974
3975 if (!_bfd_elf_link_hash_table_init (&ret->static_hash_table->root, abfd,
3976 elf32_mn10300_link_hash_newfunc,
3977 sizeof (struct elf32_mn10300_link_hash_entry)))
3978 {
3979 free (ret->static_hash_table);
3980 free (ret);
3981 return NULL;
3982 }
3983 return & ret->root.root;
3984 }
3985
3986 /* Free an mn10300 ELF linker hash table. */
3987
3988 static void
3989 elf32_mn10300_link_hash_table_free (struct bfd_link_hash_table *hash)
3990 {
3991 struct elf32_mn10300_link_hash_table *ret
3992 = (struct elf32_mn10300_link_hash_table *) hash;
3993
3994 _bfd_generic_link_hash_table_free
3995 ((struct bfd_link_hash_table *) ret->static_hash_table);
3996 _bfd_generic_link_hash_table_free
3997 ((struct bfd_link_hash_table *) ret);
3998 }
3999
4000 static unsigned long
4001 elf_mn10300_mach (flagword flags)
4002 {
4003 switch (flags & EF_MN10300_MACH)
4004 {
4005 case E_MN10300_MACH_MN10300:
4006 default:
4007 return bfd_mach_mn10300;
4008
4009 case E_MN10300_MACH_AM33:
4010 return bfd_mach_am33;
4011
4012 case E_MN10300_MACH_AM33_2:
4013 return bfd_mach_am33_2;
4014 }
4015 }
4016
4017 /* The final processing done just before writing out a MN10300 ELF object
4018 file. This gets the MN10300 architecture right based on the machine
4019 number. */
4020
4021 static void
4022 _bfd_mn10300_elf_final_write_processing (bfd *abfd,
4023 bfd_boolean linker ATTRIBUTE_UNUSED)
4024 {
4025 unsigned long val;
4026
4027 switch (bfd_get_mach (abfd))
4028 {
4029 default:
4030 case bfd_mach_mn10300:
4031 val = E_MN10300_MACH_MN10300;
4032 break;
4033
4034 case bfd_mach_am33:
4035 val = E_MN10300_MACH_AM33;
4036 break;
4037
4038 case bfd_mach_am33_2:
4039 val = E_MN10300_MACH_AM33_2;
4040 break;
4041 }
4042
4043 elf_elfheader (abfd)->e_flags &= ~ (EF_MN10300_MACH);
4044 elf_elfheader (abfd)->e_flags |= val;
4045 }
4046
4047 static bfd_boolean
4048 _bfd_mn10300_elf_object_p (bfd *abfd)
4049 {
4050 bfd_default_set_arch_mach (abfd, bfd_arch_mn10300,
4051 elf_mn10300_mach (elf_elfheader (abfd)->e_flags));
4052 return TRUE;
4053 }
4054
4055 /* Merge backend specific data from an object file to the output
4056 object file when linking. */
4057
4058 static bfd_boolean
4059 _bfd_mn10300_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
4060 {
4061 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
4062 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
4063 return TRUE;
4064
4065 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
4066 && bfd_get_mach (obfd) < bfd_get_mach (ibfd))
4067 {
4068 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
4069 bfd_get_mach (ibfd)))
4070 return FALSE;
4071 }
4072
4073 return TRUE;
4074 }
4075
4076 #define PLT0_ENTRY_SIZE 15
4077 #define PLT_ENTRY_SIZE 20
4078 #define PIC_PLT_ENTRY_SIZE 24
4079
4080 static const bfd_byte elf_mn10300_plt0_entry[PLT0_ENTRY_SIZE] =
4081 {
4082 0xfc, 0xa0, 0, 0, 0, 0, /* mov (.got+8),a0 */
4083 0xfe, 0xe, 0x10, 0, 0, 0, 0, /* mov (.got+4),r1 */
4084 0xf0, 0xf4, /* jmp (a0) */
4085 };
4086
4087 static const bfd_byte elf_mn10300_plt_entry[PLT_ENTRY_SIZE] =
4088 {
4089 0xfc, 0xa0, 0, 0, 0, 0, /* mov (nameN@GOT + .got),a0 */
4090 0xf0, 0xf4, /* jmp (a0) */
4091 0xfe, 8, 0, 0, 0, 0, 0, /* mov reloc-table-address,r0 */
4092 0xdc, 0, 0, 0, 0, /* jmp .plt0 */
4093 };
4094
4095 static const bfd_byte elf_mn10300_pic_plt_entry[PIC_PLT_ENTRY_SIZE] =
4096 {
4097 0xfc, 0x22, 0, 0, 0, 0, /* mov (nameN@GOT,a2),a0 */
4098 0xf0, 0xf4, /* jmp (a0) */
4099 0xfe, 8, 0, 0, 0, 0, 0, /* mov reloc-table-address,r0 */
4100 0xf8, 0x22, 8, /* mov (8,a2),a0 */
4101 0xfb, 0xa, 0x1a, 4, /* mov (4,a2),r1 */
4102 0xf0, 0xf4, /* jmp (a0) */
4103 };
4104
4105 /* Return size of the first PLT entry. */
4106 #define elf_mn10300_sizeof_plt0(info) \
4107 (info->shared ? PIC_PLT_ENTRY_SIZE : PLT0_ENTRY_SIZE)
4108
4109 /* Return size of a PLT entry. */
4110 #define elf_mn10300_sizeof_plt(info) \
4111 (info->shared ? PIC_PLT_ENTRY_SIZE : PLT_ENTRY_SIZE)
4112
4113 /* Return offset of the PLT0 address in an absolute PLT entry. */
4114 #define elf_mn10300_plt_plt0_offset(info) 16
4115
4116 /* Return offset of the linker in PLT0 entry. */
4117 #define elf_mn10300_plt0_linker_offset(info) 2
4118
4119 /* Return offset of the GOT id in PLT0 entry. */
4120 #define elf_mn10300_plt0_gotid_offset(info) 9
4121
4122 /* Return offset of the temporary in PLT entry. */
4123 #define elf_mn10300_plt_temp_offset(info) 8
4124
4125 /* Return offset of the symbol in PLT entry. */
4126 #define elf_mn10300_plt_symbol_offset(info) 2
4127
4128 /* Return offset of the relocation in PLT entry. */
4129 #define elf_mn10300_plt_reloc_offset(info) 11
4130
4131 /* The name of the dynamic interpreter. This is put in the .interp
4132 section. */
4133
4134 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
4135
4136 /* Create dynamic sections when linking against a dynamic object. */
4137
4138 static bfd_boolean
4139 _bfd_mn10300_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
4140 {
4141 flagword flags;
4142 asection * s;
4143 const struct elf_backend_data * bed = get_elf_backend_data (abfd);
4144 int ptralign = 0;
4145
4146 switch (bed->s->arch_size)
4147 {
4148 case 32:
4149 ptralign = 2;
4150 break;
4151
4152 case 64:
4153 ptralign = 3;
4154 break;
4155
4156 default:
4157 bfd_set_error (bfd_error_bad_value);
4158 return FALSE;
4159 }
4160
4161 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
4162 .rel[a].bss sections. */
4163 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
4164 | SEC_LINKER_CREATED);
4165
4166 s = bfd_make_section_with_flags (abfd,
4167 (bed->default_use_rela_p
4168 ? ".rela.plt" : ".rel.plt"),
4169 flags | SEC_READONLY);
4170 if (s == NULL
4171 || ! bfd_set_section_alignment (abfd, s, ptralign))
4172 return FALSE;
4173
4174 if (! _bfd_mn10300_elf_create_got_section (abfd, info))
4175 return FALSE;
4176
4177 {
4178 const char * secname;
4179 char * relname;
4180 flagword secflags;
4181 asection * sec;
4182
4183 for (sec = abfd->sections; sec; sec = sec->next)
4184 {
4185 secflags = bfd_get_section_flags (abfd, sec);
4186 if ((secflags & (SEC_DATA | SEC_LINKER_CREATED))
4187 || ((secflags & SEC_HAS_CONTENTS) != SEC_HAS_CONTENTS))
4188 continue;
4189
4190 secname = bfd_get_section_name (abfd, sec);
4191 relname = bfd_malloc (strlen (secname) + 6);
4192 strcpy (relname, ".rela");
4193 strcat (relname, secname);
4194
4195 s = bfd_make_section_with_flags (abfd, relname,
4196 flags | SEC_READONLY);
4197 if (s == NULL
4198 || ! bfd_set_section_alignment (abfd, s, ptralign))
4199 return FALSE;
4200 }
4201 }
4202
4203 if (bed->want_dynbss)
4204 {
4205 /* The .dynbss section is a place to put symbols which are defined
4206 by dynamic objects, are referenced by regular objects, and are
4207 not functions. We must allocate space for them in the process
4208 image and use a R_*_COPY reloc to tell the dynamic linker to
4209 initialize them at run time. The linker script puts the .dynbss
4210 section into the .bss section of the final image. */
4211 s = bfd_make_section_with_flags (abfd, ".dynbss",
4212 SEC_ALLOC | SEC_LINKER_CREATED);
4213 if (s == NULL)
4214 return FALSE;
4215
4216 /* The .rel[a].bss section holds copy relocs. This section is not
4217 normally needed. We need to create it here, though, so that the
4218 linker will map it to an output section. We can't just create it
4219 only if we need it, because we will not know whether we need it
4220 until we have seen all the input files, and the first time the
4221 main linker code calls BFD after examining all the input files
4222 (size_dynamic_sections) the input sections have already been
4223 mapped to the output sections. If the section turns out not to
4224 be needed, we can discard it later. We will never need this
4225 section when generating a shared object, since they do not use
4226 copy relocs. */
4227 if (! info->shared)
4228 {
4229 s = bfd_make_section_with_flags (abfd,
4230 (bed->default_use_rela_p
4231 ? ".rela.bss" : ".rel.bss"),
4232 flags | SEC_READONLY);
4233 if (s == NULL
4234 || ! bfd_set_section_alignment (abfd, s, ptralign))
4235 return FALSE;
4236 }
4237 }
4238
4239 return TRUE;
4240 }
4241 \f
4242 /* Adjust a symbol defined by a dynamic object and referenced by a
4243 regular object. The current definition is in some section of the
4244 dynamic object, but we're not including those sections. We have to
4245 change the definition to something the rest of the link can
4246 understand. */
4247
4248 static bfd_boolean
4249 _bfd_mn10300_elf_adjust_dynamic_symbol (struct bfd_link_info * info,
4250 struct elf_link_hash_entry * h)
4251 {
4252 bfd * dynobj;
4253 asection * s;
4254
4255 dynobj = elf_hash_table (info)->dynobj;
4256
4257 /* Make sure we know what is going on here. */
4258 BFD_ASSERT (dynobj != NULL
4259 && (h->needs_plt
4260 || h->u.weakdef != NULL
4261 || (h->def_dynamic
4262 && h->ref_regular
4263 && !h->def_regular)));
4264
4265 /* If this is a function, put it in the procedure linkage table. We
4266 will fill in the contents of the procedure linkage table later,
4267 when we know the address of the .got section. */
4268 if (h->type == STT_FUNC
4269 || h->needs_plt)
4270 {
4271 if (! info->shared
4272 && !h->def_dynamic
4273 && !h->ref_dynamic)
4274 {
4275 /* This case can occur if we saw a PLT reloc in an input
4276 file, but the symbol was never referred to by a dynamic
4277 object. In such a case, we don't actually need to build
4278 a procedure linkage table, and we can just do a REL32
4279 reloc instead. */
4280 BFD_ASSERT (h->needs_plt);
4281 return TRUE;
4282 }
4283
4284 /* Make sure this symbol is output as a dynamic symbol. */
4285 if (h->dynindx == -1)
4286 {
4287 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4288 return FALSE;
4289 }
4290
4291 s = bfd_get_section_by_name (dynobj, ".plt");
4292 BFD_ASSERT (s != NULL);
4293
4294 /* If this is the first .plt entry, make room for the special
4295 first entry. */
4296 if (s->size == 0)
4297 s->size += elf_mn10300_sizeof_plt0 (info);
4298
4299 /* If this symbol is not defined in a regular file, and we are
4300 not generating a shared library, then set the symbol to this
4301 location in the .plt. This is required to make function
4302 pointers compare as equal between the normal executable and
4303 the shared library. */
4304 if (! info->shared
4305 && !h->def_regular)
4306 {
4307 h->root.u.def.section = s;
4308 h->root.u.def.value = s->size;
4309 }
4310
4311 h->plt.offset = s->size;
4312
4313 /* Make room for this entry. */
4314 s->size += elf_mn10300_sizeof_plt (info);
4315
4316 /* We also need to make an entry in the .got.plt section, which
4317 will be placed in the .got section by the linker script. */
4318 s = bfd_get_section_by_name (dynobj, ".got.plt");
4319 BFD_ASSERT (s != NULL);
4320 s->size += 4;
4321
4322 /* We also need to make an entry in the .rela.plt section. */
4323 s = bfd_get_section_by_name (dynobj, ".rela.plt");
4324 BFD_ASSERT (s != NULL);
4325 s->size += sizeof (Elf32_External_Rela);
4326
4327 return TRUE;
4328 }
4329
4330 /* If this is a weak symbol, and there is a real definition, the
4331 processor independent code will have arranged for us to see the
4332 real definition first, and we can just use the same value. */
4333 if (h->u.weakdef != NULL)
4334 {
4335 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
4336 || h->u.weakdef->root.type == bfd_link_hash_defweak);
4337 h->root.u.def.section = h->u.weakdef->root.u.def.section;
4338 h->root.u.def.value = h->u.weakdef->root.u.def.value;
4339 return TRUE;
4340 }
4341
4342 /* This is a reference to a symbol defined by a dynamic object which
4343 is not a function. */
4344
4345 /* If we are creating a shared library, we must presume that the
4346 only references to the symbol are via the global offset table.
4347 For such cases we need not do anything here; the relocations will
4348 be handled correctly by relocate_section. */
4349 if (info->shared)
4350 return TRUE;
4351
4352 /* If there are no references to this symbol that do not use the
4353 GOT, we don't need to generate a copy reloc. */
4354 if (!h->non_got_ref)
4355 return TRUE;
4356
4357 if (h->size == 0)
4358 {
4359 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
4360 h->root.root.string);
4361 return TRUE;
4362 }
4363
4364 /* We must allocate the symbol in our .dynbss section, which will
4365 become part of the .bss section of the executable. There will be
4366 an entry for this symbol in the .dynsym section. The dynamic
4367 object will contain position independent code, so all references
4368 from the dynamic object to this symbol will go through the global
4369 offset table. The dynamic linker will use the .dynsym entry to
4370 determine the address it must put in the global offset table, so
4371 both the dynamic object and the regular object will refer to the
4372 same memory location for the variable. */
4373
4374 s = bfd_get_section_by_name (dynobj, ".dynbss");
4375 BFD_ASSERT (s != NULL);
4376
4377 /* We must generate a R_MN10300_COPY reloc to tell the dynamic linker to
4378 copy the initial value out of the dynamic object and into the
4379 runtime process image. We need to remember the offset into the
4380 .rela.bss section we are going to use. */
4381 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
4382 {
4383 asection * srel;
4384
4385 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
4386 BFD_ASSERT (srel != NULL);
4387 srel->size += sizeof (Elf32_External_Rela);
4388 h->needs_copy = 1;
4389 }
4390
4391 return _bfd_elf_adjust_dynamic_copy (h, s);
4392 }
4393
4394 /* Set the sizes of the dynamic sections. */
4395
4396 static bfd_boolean
4397 _bfd_mn10300_elf_size_dynamic_sections (bfd * output_bfd,
4398 struct bfd_link_info * info)
4399 {
4400 bfd * dynobj;
4401 asection * s;
4402 bfd_boolean plt;
4403 bfd_boolean relocs;
4404 bfd_boolean reltext;
4405
4406 dynobj = elf_hash_table (info)->dynobj;
4407 BFD_ASSERT (dynobj != NULL);
4408
4409 if (elf_hash_table (info)->dynamic_sections_created)
4410 {
4411 /* Set the contents of the .interp section to the interpreter. */
4412 if (info->executable)
4413 {
4414 s = bfd_get_section_by_name (dynobj, ".interp");
4415 BFD_ASSERT (s != NULL);
4416 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
4417 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
4418 }
4419 }
4420 else
4421 {
4422 /* We may have created entries in the .rela.got section.
4423 However, if we are not creating the dynamic sections, we will
4424 not actually use these entries. Reset the size of .rela.got,
4425 which will cause it to get stripped from the output file
4426 below. */
4427 s = bfd_get_section_by_name (dynobj, ".rela.got");
4428 if (s != NULL)
4429 s->size = 0;
4430 }
4431
4432 /* The check_relocs and adjust_dynamic_symbol entry points have
4433 determined the sizes of the various dynamic sections. Allocate
4434 memory for them. */
4435 plt = FALSE;
4436 relocs = FALSE;
4437 reltext = FALSE;
4438 for (s = dynobj->sections; s != NULL; s = s->next)
4439 {
4440 const char * name;
4441
4442 if ((s->flags & SEC_LINKER_CREATED) == 0)
4443 continue;
4444
4445 /* It's OK to base decisions on the section name, because none
4446 of the dynobj section names depend upon the input files. */
4447 name = bfd_get_section_name (dynobj, s);
4448
4449 if (streq (name, ".plt"))
4450 {
4451 /* Remember whether there is a PLT. */
4452 plt = s->size != 0;
4453 }
4454 else if (CONST_STRNEQ (name, ".rela"))
4455 {
4456 if (s->size != 0)
4457 {
4458 asection * target;
4459
4460 /* Remember whether there are any reloc sections other
4461 than .rela.plt. */
4462 if (! streq (name, ".rela.plt"))
4463 {
4464 const char * outname;
4465
4466 relocs = TRUE;
4467
4468 /* If this relocation section applies to a read only
4469 section, then we probably need a DT_TEXTREL
4470 entry. The entries in the .rela.plt section
4471 really apply to the .got section, which we
4472 created ourselves and so know is not readonly. */
4473 outname = bfd_get_section_name (output_bfd,
4474 s->output_section);
4475 target = bfd_get_section_by_name (output_bfd, outname + 5);
4476 if (target != NULL
4477 && (target->flags & SEC_READONLY) != 0
4478 && (target->flags & SEC_ALLOC) != 0)
4479 reltext = TRUE;
4480 }
4481
4482 /* We use the reloc_count field as a counter if we need
4483 to copy relocs into the output file. */
4484 s->reloc_count = 0;
4485 }
4486 }
4487 else if (! CONST_STRNEQ (name, ".got")
4488 && ! streq (name, ".dynbss"))
4489 /* It's not one of our sections, so don't allocate space. */
4490 continue;
4491
4492 if (s->size == 0)
4493 {
4494 /* If we don't need this section, strip it from the
4495 output file. This is mostly to handle .rela.bss and
4496 .rela.plt. We must create both sections in
4497 create_dynamic_sections, because they must be created
4498 before the linker maps input sections to output
4499 sections. The linker does that before
4500 adjust_dynamic_symbol is called, and it is that
4501 function which decides whether anything needs to go
4502 into these sections. */
4503 s->flags |= SEC_EXCLUDE;
4504 continue;
4505 }
4506
4507 if ((s->flags & SEC_HAS_CONTENTS) == 0)
4508 continue;
4509
4510 /* Allocate memory for the section contents. We use bfd_zalloc
4511 here in case unused entries are not reclaimed before the
4512 section's contents are written out. This should not happen,
4513 but this way if it does, we get a R_MN10300_NONE reloc
4514 instead of garbage. */
4515 s->contents = bfd_zalloc (dynobj, s->size);
4516 if (s->contents == NULL)
4517 return FALSE;
4518 }
4519
4520 if (elf_hash_table (info)->dynamic_sections_created)
4521 {
4522 /* Add some entries to the .dynamic section. We fill in the
4523 values later, in _bfd_mn10300_elf_finish_dynamic_sections,
4524 but we must add the entries now so that we get the correct
4525 size for the .dynamic section. The DT_DEBUG entry is filled
4526 in by the dynamic linker and used by the debugger. */
4527 if (! info->shared)
4528 {
4529 if (!_bfd_elf_add_dynamic_entry (info, DT_DEBUG, 0))
4530 return FALSE;
4531 }
4532
4533 if (plt)
4534 {
4535 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0)
4536 || !_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0)
4537 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
4538 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0))
4539 return FALSE;
4540 }
4541
4542 if (relocs)
4543 {
4544 if (!_bfd_elf_add_dynamic_entry (info, DT_RELA, 0)
4545 || !_bfd_elf_add_dynamic_entry (info, DT_RELASZ, 0)
4546 || !_bfd_elf_add_dynamic_entry (info, DT_RELAENT,
4547 sizeof (Elf32_External_Rela)))
4548 return FALSE;
4549 }
4550
4551 if (reltext)
4552 {
4553 if (!_bfd_elf_add_dynamic_entry (info, DT_TEXTREL, 0))
4554 return FALSE;
4555 }
4556 }
4557
4558 return TRUE;
4559 }
4560
4561 /* Finish up dynamic symbol handling. We set the contents of various
4562 dynamic sections here. */
4563
4564 static bfd_boolean
4565 _bfd_mn10300_elf_finish_dynamic_symbol (bfd * output_bfd,
4566 struct bfd_link_info * info,
4567 struct elf_link_hash_entry * h,
4568 Elf_Internal_Sym * sym)
4569 {
4570 bfd * dynobj;
4571
4572 dynobj = elf_hash_table (info)->dynobj;
4573
4574 if (h->plt.offset != (bfd_vma) -1)
4575 {
4576 asection * splt;
4577 asection * sgot;
4578 asection * srel;
4579 bfd_vma plt_index;
4580 bfd_vma got_offset;
4581 Elf_Internal_Rela rel;
4582
4583 /* This symbol has an entry in the procedure linkage table. Set
4584 it up. */
4585
4586 BFD_ASSERT (h->dynindx != -1);
4587
4588 splt = bfd_get_section_by_name (dynobj, ".plt");
4589 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
4590 srel = bfd_get_section_by_name (dynobj, ".rela.plt");
4591 BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL);
4592
4593 /* Get the index in the procedure linkage table which
4594 corresponds to this symbol. This is the index of this symbol
4595 in all the symbols for which we are making plt entries. The
4596 first entry in the procedure linkage table is reserved. */
4597 plt_index = ((h->plt.offset - elf_mn10300_sizeof_plt0 (info))
4598 / elf_mn10300_sizeof_plt (info));
4599
4600 /* Get the offset into the .got table of the entry that
4601 corresponds to this function. Each .got entry is 4 bytes.
4602 The first three are reserved. */
4603 got_offset = (plt_index + 3) * 4;
4604
4605 /* Fill in the entry in the procedure linkage table. */
4606 if (! info->shared)
4607 {
4608 memcpy (splt->contents + h->plt.offset, elf_mn10300_plt_entry,
4609 elf_mn10300_sizeof_plt (info));
4610 bfd_put_32 (output_bfd,
4611 (sgot->output_section->vma
4612 + sgot->output_offset
4613 + got_offset),
4614 (splt->contents + h->plt.offset
4615 + elf_mn10300_plt_symbol_offset (info)));
4616
4617 bfd_put_32 (output_bfd,
4618 (1 - h->plt.offset - elf_mn10300_plt_plt0_offset (info)),
4619 (splt->contents + h->plt.offset
4620 + elf_mn10300_plt_plt0_offset (info)));
4621 }
4622 else
4623 {
4624 memcpy (splt->contents + h->plt.offset, elf_mn10300_pic_plt_entry,
4625 elf_mn10300_sizeof_plt (info));
4626
4627 bfd_put_32 (output_bfd, got_offset,
4628 (splt->contents + h->plt.offset
4629 + elf_mn10300_plt_symbol_offset (info)));
4630 }
4631
4632 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
4633 (splt->contents + h->plt.offset
4634 + elf_mn10300_plt_reloc_offset (info)));
4635
4636 /* Fill in the entry in the global offset table. */
4637 bfd_put_32 (output_bfd,
4638 (splt->output_section->vma
4639 + splt->output_offset
4640 + h->plt.offset
4641 + elf_mn10300_plt_temp_offset (info)),
4642 sgot->contents + got_offset);
4643
4644 /* Fill in the entry in the .rela.plt section. */
4645 rel.r_offset = (sgot->output_section->vma
4646 + sgot->output_offset
4647 + got_offset);
4648 rel.r_info = ELF32_R_INFO (h->dynindx, R_MN10300_JMP_SLOT);
4649 rel.r_addend = 0;
4650 bfd_elf32_swap_reloca_out (output_bfd, &rel,
4651 (bfd_byte *) ((Elf32_External_Rela *) srel->contents
4652 + plt_index));
4653
4654 if (!h->def_regular)
4655 /* Mark the symbol as undefined, rather than as defined in
4656 the .plt section. Leave the value alone. */
4657 sym->st_shndx = SHN_UNDEF;
4658 }
4659
4660 if (h->got.offset != (bfd_vma) -1)
4661 {
4662 asection * sgot;
4663 asection * srel;
4664 Elf_Internal_Rela rel;
4665
4666 /* This symbol has an entry in the global offset table. Set it up. */
4667 sgot = bfd_get_section_by_name (dynobj, ".got");
4668 srel = bfd_get_section_by_name (dynobj, ".rela.got");
4669 BFD_ASSERT (sgot != NULL && srel != NULL);
4670
4671 rel.r_offset = (sgot->output_section->vma
4672 + sgot->output_offset
4673 + (h->got.offset & ~1));
4674
4675 /* If this is a -Bsymbolic link, and the symbol is defined
4676 locally, we just want to emit a RELATIVE reloc. Likewise if
4677 the symbol was forced to be local because of a version file.
4678 The entry in the global offset table will already have been
4679 initialized in the relocate_section function. */
4680 if (info->shared
4681 && (info->symbolic || h->dynindx == -1)
4682 && h->def_regular)
4683 {
4684 rel.r_info = ELF32_R_INFO (0, R_MN10300_RELATIVE);
4685 rel.r_addend = (h->root.u.def.value
4686 + h->root.u.def.section->output_section->vma
4687 + h->root.u.def.section->output_offset);
4688 }
4689 else
4690 {
4691 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
4692 rel.r_info = ELF32_R_INFO (h->dynindx, R_MN10300_GLOB_DAT);
4693 rel.r_addend = 0;
4694 }
4695
4696 bfd_elf32_swap_reloca_out (output_bfd, &rel,
4697 (bfd_byte *) ((Elf32_External_Rela *) srel->contents
4698 + srel->reloc_count));
4699 ++ srel->reloc_count;
4700 }
4701
4702 if (h->needs_copy)
4703 {
4704 asection * s;
4705 Elf_Internal_Rela rel;
4706
4707 /* This symbol needs a copy reloc. Set it up. */
4708 BFD_ASSERT (h->dynindx != -1
4709 && (h->root.type == bfd_link_hash_defined
4710 || h->root.type == bfd_link_hash_defweak));
4711
4712 s = bfd_get_section_by_name (h->root.u.def.section->owner,
4713 ".rela.bss");
4714 BFD_ASSERT (s != NULL);
4715
4716 rel.r_offset = (h->root.u.def.value
4717 + h->root.u.def.section->output_section->vma
4718 + h->root.u.def.section->output_offset);
4719 rel.r_info = ELF32_R_INFO (h->dynindx, R_MN10300_COPY);
4720 rel.r_addend = 0;
4721 bfd_elf32_swap_reloca_out (output_bfd, & rel,
4722 (bfd_byte *) ((Elf32_External_Rela *) s->contents
4723 + s->reloc_count));
4724 ++ s->reloc_count;
4725 }
4726
4727 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
4728 if (streq (h->root.root.string, "_DYNAMIC")
4729 || h == elf_hash_table (info)->hgot)
4730 sym->st_shndx = SHN_ABS;
4731
4732 return TRUE;
4733 }
4734
4735 /* Finish up the dynamic sections. */
4736
4737 static bfd_boolean
4738 _bfd_mn10300_elf_finish_dynamic_sections (bfd * output_bfd,
4739 struct bfd_link_info * info)
4740 {
4741 bfd * dynobj;
4742 asection * sgot;
4743 asection * sdyn;
4744
4745 dynobj = elf_hash_table (info)->dynobj;
4746
4747 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
4748 BFD_ASSERT (sgot != NULL);
4749 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4750
4751 if (elf_hash_table (info)->dynamic_sections_created)
4752 {
4753 asection * splt;
4754 Elf32_External_Dyn * dyncon;
4755 Elf32_External_Dyn * dynconend;
4756
4757 BFD_ASSERT (sdyn != NULL);
4758
4759 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4760 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4761
4762 for (; dyncon < dynconend; dyncon++)
4763 {
4764 Elf_Internal_Dyn dyn;
4765 const char * name;
4766 asection * s;
4767
4768 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4769
4770 switch (dyn.d_tag)
4771 {
4772 default:
4773 break;
4774
4775 case DT_PLTGOT:
4776 name = ".got";
4777 goto get_vma;
4778
4779 case DT_JMPREL:
4780 name = ".rela.plt";
4781 get_vma:
4782 s = bfd_get_section_by_name (output_bfd, name);
4783 BFD_ASSERT (s != NULL);
4784 dyn.d_un.d_ptr = s->vma;
4785 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4786 break;
4787
4788 case DT_PLTRELSZ:
4789 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
4790 BFD_ASSERT (s != NULL);
4791 dyn.d_un.d_val = s->size;
4792 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4793 break;
4794
4795 case DT_RELASZ:
4796 /* My reading of the SVR4 ABI indicates that the
4797 procedure linkage table relocs (DT_JMPREL) should be
4798 included in the overall relocs (DT_RELA). This is
4799 what Solaris does. However, UnixWare can not handle
4800 that case. Therefore, we override the DT_RELASZ entry
4801 here to make it not include the JMPREL relocs. Since
4802 the linker script arranges for .rela.plt to follow all
4803 other relocation sections, we don't have to worry
4804 about changing the DT_RELA entry. */
4805 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
4806 if (s != NULL)
4807 dyn.d_un.d_val -= s->size;
4808 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4809 break;
4810 }
4811 }
4812
4813 /* Fill in the first entry in the procedure linkage table. */
4814 splt = bfd_get_section_by_name (dynobj, ".plt");
4815 if (splt && splt->size > 0)
4816 {
4817 if (info->shared)
4818 {
4819 memcpy (splt->contents, elf_mn10300_pic_plt_entry,
4820 elf_mn10300_sizeof_plt (info));
4821 }
4822 else
4823 {
4824 memcpy (splt->contents, elf_mn10300_plt0_entry, PLT0_ENTRY_SIZE);
4825 bfd_put_32 (output_bfd,
4826 sgot->output_section->vma + sgot->output_offset + 4,
4827 splt->contents + elf_mn10300_plt0_gotid_offset (info));
4828 bfd_put_32 (output_bfd,
4829 sgot->output_section->vma + sgot->output_offset + 8,
4830 splt->contents + elf_mn10300_plt0_linker_offset (info));
4831 }
4832
4833 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4834 really seem like the right value. */
4835 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
4836 }
4837 }
4838
4839 /* Fill in the first three entries in the global offset table. */
4840 if (sgot->size > 0)
4841 {
4842 if (sdyn == NULL)
4843 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
4844 else
4845 bfd_put_32 (output_bfd,
4846 sdyn->output_section->vma + sdyn->output_offset,
4847 sgot->contents);
4848 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
4849 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
4850 }
4851
4852 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
4853
4854 return TRUE;
4855 }
4856
4857 /* Classify relocation types, such that combreloc can sort them
4858 properly. */
4859
4860 static enum elf_reloc_type_class
4861 _bfd_mn10300_elf_reloc_type_class (const Elf_Internal_Rela *rela)
4862 {
4863 switch ((int) ELF32_R_TYPE (rela->r_info))
4864 {
4865 case R_MN10300_RELATIVE: return reloc_class_relative;
4866 case R_MN10300_JMP_SLOT: return reloc_class_plt;
4867 case R_MN10300_COPY: return reloc_class_copy;
4868 default: return reloc_class_normal;
4869 }
4870 }
4871
4872 #ifndef ELF_ARCH
4873 #define TARGET_LITTLE_SYM bfd_elf32_mn10300_vec
4874 #define TARGET_LITTLE_NAME "elf32-mn10300"
4875 #define ELF_ARCH bfd_arch_mn10300
4876 #define ELF_MACHINE_CODE EM_MN10300
4877 #define ELF_MACHINE_ALT1 EM_CYGNUS_MN10300
4878 #define ELF_MAXPAGESIZE 0x1000
4879 #endif
4880
4881 #define elf_info_to_howto mn10300_info_to_howto
4882 #define elf_info_to_howto_rel 0
4883 #define elf_backend_can_gc_sections 1
4884 #define elf_backend_rela_normal 1
4885 #define elf_backend_check_relocs mn10300_elf_check_relocs
4886 #define elf_backend_gc_mark_hook mn10300_elf_gc_mark_hook
4887 #define elf_backend_relocate_section mn10300_elf_relocate_section
4888 #define bfd_elf32_bfd_relax_section mn10300_elf_relax_section
4889 #define bfd_elf32_bfd_get_relocated_section_contents \
4890 mn10300_elf_get_relocated_section_contents
4891 #define bfd_elf32_bfd_link_hash_table_create \
4892 elf32_mn10300_link_hash_table_create
4893 #define bfd_elf32_bfd_link_hash_table_free \
4894 elf32_mn10300_link_hash_table_free
4895
4896 #ifndef elf_symbol_leading_char
4897 #define elf_symbol_leading_char '_'
4898 #endif
4899
4900 /* So we can set bits in e_flags. */
4901 #define elf_backend_final_write_processing \
4902 _bfd_mn10300_elf_final_write_processing
4903 #define elf_backend_object_p _bfd_mn10300_elf_object_p
4904
4905 #define bfd_elf32_bfd_merge_private_bfd_data \
4906 _bfd_mn10300_elf_merge_private_bfd_data
4907
4908 #define elf_backend_can_gc_sections 1
4909 #define elf_backend_create_dynamic_sections \
4910 _bfd_mn10300_elf_create_dynamic_sections
4911 #define elf_backend_adjust_dynamic_symbol \
4912 _bfd_mn10300_elf_adjust_dynamic_symbol
4913 #define elf_backend_size_dynamic_sections \
4914 _bfd_mn10300_elf_size_dynamic_sections
4915 #define elf_backend_omit_section_dynsym \
4916 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4917 #define elf_backend_finish_dynamic_symbol \
4918 _bfd_mn10300_elf_finish_dynamic_symbol
4919 #define elf_backend_finish_dynamic_sections \
4920 _bfd_mn10300_elf_finish_dynamic_sections
4921
4922 #define elf_backend_reloc_type_class \
4923 _bfd_mn10300_elf_reloc_type_class
4924
4925 #define elf_backend_want_got_plt 1
4926 #define elf_backend_plt_readonly 1
4927 #define elf_backend_want_plt_sym 0
4928 #define elf_backend_got_header_size 12
4929
4930 #include "elf32-target.h"
GDB Binutils - Deliverables
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