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* elf.c (_bfd_elf_rela_local_sym): Only call
[deliverable/binutils-gdb.git] / bfd / elf32-cris.c
1 /* CRIS-specific support for 32-bit ELF.
2 Copyright 2000, 2001 Free Software Foundation, Inc.
3 Contributed by Axis Communications AB.
4 Written by Hans-Peter Nilsson, based on elf32-fr30.c
5 PIC and shlib bits based primarily on elf32-m68k.c and elf32-i386.c.
6
7 This file is part of BFD, the Binary File Descriptor library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/cris.h"
28
29 /* Forward declarations. */
30 static reloc_howto_type * cris_reloc_type_lookup
31 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
32
33 static void cris_info_to_howto_rela
34 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
35
36 static boolean cris_elf_grok_prstatus
37 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
38
39 static boolean cris_elf_grok_psinfo
40 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
41
42 static boolean cris_elf_relocate_section
43 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
44 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
45
46 static bfd_reloc_status_type cris_final_link_relocate
47 PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
48 Elf_Internal_Rela *, bfd_vma));
49
50 static boolean cris_elf_gc_sweep_hook
51 PARAMS ((bfd *, struct bfd_link_info *, asection *,
52 const Elf_Internal_Rela *));
53
54 static asection * cris_elf_gc_mark_hook
55 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
56 struct elf_link_hash_entry *, Elf_Internal_Sym *));
57
58 static boolean cris_elf_object_p PARAMS ((bfd *));
59
60 static void cris_elf_final_write_processing PARAMS ((bfd *, boolean));
61
62 static boolean cris_elf_print_private_bfd_data PARAMS ((bfd *, PTR));
63
64 static boolean cris_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
65
66 struct elf_cris_link_hash_entry;
67 static boolean elf_cris_discard_excess_dso_dynamics
68 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
69 static boolean elf_cris_discard_excess_program_dynamics
70 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
71 static boolean elf_cris_adjust_gotplt_to_got
72 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
73 static boolean elf_cris_try_fold_plt_to_got
74 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
75 static struct bfd_hash_entry *elf_cris_link_hash_newfunc
76 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
77 static struct bfd_link_hash_table *elf_cris_link_hash_table_create
78 PARAMS ((bfd *));
79 static boolean elf_cris_adjust_dynamic_symbol
80 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
81 static boolean cris_elf_check_relocs
82 PARAMS ((bfd *, struct bfd_link_info *, asection *,
83 const Elf_Internal_Rela *));
84
85 static boolean elf_cris_size_dynamic_sections
86 PARAMS ((bfd *, struct bfd_link_info *));
87 static boolean elf_cris_finish_dynamic_symbol
88 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
89 Elf_Internal_Sym *));
90 static boolean elf_cris_finish_dynamic_sections
91 PARAMS ((bfd *, struct bfd_link_info *));
92 static void elf_cris_hide_symbol
93 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
94 static enum elf_reloc_type_class elf_cris_reloc_type_class
95 PARAMS ((const Elf_Internal_Rela *));
96
97 static reloc_howto_type cris_elf_howto_table [] =
98 {
99 /* This reloc does nothing. */
100 HOWTO (R_CRIS_NONE, /* type */
101 0, /* rightshift */
102 2, /* size (0 = byte, 1 = short, 2 = long) */
103 32, /* bitsize */
104 false, /* pc_relative */
105 0, /* bitpos */
106 complain_overflow_bitfield, /* complain_on_overflow */
107 bfd_elf_generic_reloc, /* special_function */
108 "R_CRIS_NONE", /* name */
109 false, /* partial_inplace */
110 0, /* src_mask */
111 0, /* dst_mask */
112 false), /* pcrel_offset */
113
114 /* An 8 bit absolute relocation. */
115 HOWTO (R_CRIS_8, /* type */
116 0, /* rightshift */
117 0, /* size (0 = byte, 1 = short, 2 = long) */
118 8, /* bitsize */
119 false, /* pc_relative */
120 0, /* bitpos */
121 complain_overflow_bitfield, /* complain_on_overflow */
122 bfd_elf_generic_reloc, /* special_function */
123 "R_CRIS_8", /* name */
124 false, /* partial_inplace */
125 0x0000, /* src_mask */
126 0x00ff, /* dst_mask */
127 false), /* pcrel_offset */
128
129 /* A 16 bit absolute relocation. */
130 HOWTO (R_CRIS_16, /* type */
131 0, /* rightshift */
132 1, /* size (0 = byte, 1 = short, 2 = long) */
133 16, /* bitsize */
134 false, /* pc_relative */
135 0, /* bitpos */
136 complain_overflow_bitfield, /* complain_on_overflow */
137 bfd_elf_generic_reloc, /* special_function */
138 "R_CRIS_16", /* name */
139 false, /* partial_inplace */
140 0x00000000, /* src_mask */
141 0x0000ffff, /* dst_mask */
142 false), /* pcrel_offset */
143
144 /* A 32 bit absolute relocation. */
145 HOWTO (R_CRIS_32, /* type */
146 0, /* rightshift */
147 2, /* size (0 = byte, 1 = short, 2 = long) */
148 32, /* bitsize */
149 false, /* pc_relative */
150 0, /* bitpos */
151 complain_overflow_bitfield, /* complain_on_overflow */
152 bfd_elf_generic_reloc, /* special_function */
153 "R_CRIS_32", /* name */
154 false, /* partial_inplace */
155 0x00000000, /* src_mask */
156 0xffffffff, /* dst_mask */
157 false), /* pcrel_offset */
158
159 /* An 8 bit PC-relative relocation. */
160 HOWTO (R_CRIS_8_PCREL, /* type */
161 0, /* rightshift */
162 0, /* size (0 = byte, 1 = short, 2 = long) */
163 8, /* bitsize */
164 true, /* pc_relative */
165 0, /* bitpos */
166 complain_overflow_bitfield, /* complain_on_overflow */
167 bfd_elf_generic_reloc, /* special_function */
168 "R_CRIS_8_PCREL", /* name */
169 false, /* partial_inplace */
170 0x0000, /* src_mask */
171 0x00ff, /* dst_mask */
172 true), /* pcrel_offset */
173
174 /* A 16 bit PC-relative relocation. */
175 HOWTO (R_CRIS_16_PCREL, /* type */
176 0, /* rightshift */
177 1, /* size (0 = byte, 1 = short, 2 = long) */
178 16, /* bitsize */
179 true, /* pc_relative */
180 0, /* bitpos */
181 complain_overflow_bitfield, /* complain_on_overflow */
182 bfd_elf_generic_reloc, /* special_function */
183 "R_CRIS_16", /* name */
184 false, /* partial_inplace */
185 0x00000000, /* src_mask */
186 0x0000ffff, /* dst_mask */
187 true), /* pcrel_offset */
188
189 /* A 32 bit PC-relative relocation. */
190 HOWTO (R_CRIS_32_PCREL, /* type */
191 0, /* rightshift */
192 2, /* size (0 = byte, 1 = short, 2 = long) */
193 32, /* bitsize */
194 true, /* pc_relative */
195 0, /* bitpos */
196 complain_overflow_bitfield, /* complain_on_overflow */
197 bfd_elf_generic_reloc, /* special_function */
198 "R_CRIS_32", /* name */
199 false, /* partial_inplace */
200 0x00000000, /* src_mask */
201 0xffffffff, /* dst_mask */
202 true), /* pcrel_offset */
203
204 /* GNU extension to record C++ vtable hierarchy. */
205 HOWTO (R_CRIS_GNU_VTINHERIT, /* type */
206 0, /* rightshift */
207 2, /* size (0 = byte, 1 = short, 2 = long) */
208 0, /* bitsize */
209 false, /* pc_relative */
210 0, /* bitpos */
211 complain_overflow_dont, /* complain_on_overflow */
212 NULL, /* special_function */
213 "R_CRIS_GNU_VTINHERIT", /* name */
214 false, /* partial_inplace */
215 0, /* src_mask */
216 0, /* dst_mask */
217 false), /* pcrel_offset */
218
219 /* GNU extension to record C++ vtable member usage. */
220 HOWTO (R_CRIS_GNU_VTENTRY, /* type */
221 0, /* rightshift */
222 2, /* size (0 = byte, 1 = short, 2 = long) */
223 0, /* bitsize */
224 false, /* pc_relative */
225 0, /* bitpos */
226 complain_overflow_dont, /* complain_on_overflow */
227 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
228 "R_CRIS_GNU_VTENTRY", /* name */
229 false, /* partial_inplace */
230 0, /* src_mask */
231 0, /* dst_mask */
232 false), /* pcrel_offset */
233
234 /* This is used only by the dynamic linker. The symbol should exist
235 both in the object being run and in some shared library. The
236 dynamic linker copies the data addressed by the symbol from the
237 shared library into the object, because the object being
238 run has to have the data at some particular address. */
239 HOWTO (R_CRIS_COPY, /* type */
240 0, /* rightshift */
241 2, /* size (0 = byte, 1 = short, 2 = long) */
242 32, /* bitsize */
243 false, /* pc_relative */
244 0, /* bitpos */
245 complain_overflow_bitfield, /* complain_on_overflow */
246 bfd_elf_generic_reloc, /* special_function */
247 "R_CRIS_COPY", /* name */
248 false, /* partial_inplace */
249 0, /* src_mask */
250 0, /* dst_mask */
251 false), /* pcrel_offset */
252
253 /* Like R_CRIS_32, but used when setting global offset table entries. */
254 HOWTO (R_CRIS_GLOB_DAT, /* type */
255 0, /* rightshift */
256 2, /* size (0 = byte, 1 = short, 2 = long) */
257 32, /* bitsize */
258 false, /* pc_relative */
259 0, /* bitpos */
260 complain_overflow_bitfield, /* complain_on_overflow */
261 bfd_elf_generic_reloc, /* special_function */
262 "R_CRIS_GLOB_DAT", /* name */
263 false, /* partial_inplace */
264 0, /* src_mask */
265 0xffffffff, /* dst_mask */
266 false), /* pcrel_offset */
267
268 /* Marks a procedure linkage table entry for a symbol. */
269 HOWTO (R_CRIS_JUMP_SLOT, /* type */
270 0, /* rightshift */
271 2, /* size (0 = byte, 1 = short, 2 = long) */
272 32, /* bitsize */
273 false, /* pc_relative */
274 0, /* bitpos */
275 complain_overflow_bitfield, /* complain_on_overflow */
276 bfd_elf_generic_reloc, /* special_function */
277 "R_CRIS_JUMP_SLOT", /* name */
278 false, /* partial_inplace */
279 0, /* src_mask */
280 0, /* dst_mask */
281 false), /* pcrel_offset */
282
283 /* Used only by the dynamic linker. When the object is run, this
284 longword is set to the load address of the object, plus the
285 addend. */
286 HOWTO (R_CRIS_RELATIVE, /* type */
287 0, /* rightshift */
288 2, /* size (0 = byte, 1 = short, 2 = long) */
289 32, /* bitsize */
290 false, /* pc_relative */
291 0, /* bitpos */
292 complain_overflow_bitfield, /* complain_on_overflow */
293 bfd_elf_generic_reloc, /* special_function */
294 "R_CRIS_RELATIVE", /* name */
295 false, /* partial_inplace */
296 0, /* src_mask */
297 0xffffffff, /* dst_mask */
298 false), /* pcrel_offset */
299
300 /* Like R_CRIS_32, but referring to the GOT table entry for the symbol. */
301 HOWTO (R_CRIS_16_GOT, /* type */
302 0, /* rightshift */
303 1, /* size (0 = byte, 1 = short, 2 = long) */
304 16, /* bitsize */
305 false, /* pc_relative */
306 0, /* bitpos */
307 complain_overflow_bitfield, /* complain_on_overflow */
308 bfd_elf_generic_reloc, /* special_function */
309 "R_CRIS_16_GOT", /* name */
310 false, /* partial_inplace */
311 0, /* src_mask */
312 0xffff, /* dst_mask */
313 false), /* pcrel_offset */
314
315 HOWTO (R_CRIS_32_GOT, /* type */
316 0, /* rightshift */
317 2, /* size (0 = byte, 1 = short, 2 = long) */
318 32, /* bitsize */
319 false, /* pc_relative */
320 0, /* bitpos */
321 complain_overflow_bitfield, /* complain_on_overflow */
322 bfd_elf_generic_reloc, /* special_function */
323 "R_CRIS_32_GOT", /* name */
324 false, /* partial_inplace */
325 0, /* src_mask */
326 0xffffffff, /* dst_mask */
327 false), /* pcrel_offset */
328
329 /* Like R_CRIS_32_GOT, but referring to (and requesting a) PLT part of
330 the GOT table for the symbol. */
331 HOWTO (R_CRIS_16_GOTPLT, /* type */
332 0, /* rightshift */
333 1, /* size (0 = byte, 1 = short, 2 = long) */
334 16, /* bitsize */
335 false, /* pc_relative */
336 0, /* bitpos */
337 complain_overflow_bitfield, /* complain_on_overflow */
338 bfd_elf_generic_reloc, /* special_function */
339 "R_CRIS_16_GOTPLT", /* name */
340 false, /* partial_inplace */
341 0, /* src_mask */
342 0xffff, /* dst_mask */
343 false), /* pcrel_offset */
344
345 HOWTO (R_CRIS_32_GOTPLT, /* type */
346 0, /* rightshift */
347 2, /* size (0 = byte, 1 = short, 2 = long) */
348 32, /* bitsize */
349 false, /* pc_relative */
350 0, /* bitpos */
351 complain_overflow_bitfield, /* complain_on_overflow */
352 bfd_elf_generic_reloc, /* special_function */
353 "R_CRIS_32_GOTPLT", /* name */
354 false, /* partial_inplace */
355 0, /* src_mask */
356 0xffffffff, /* dst_mask */
357 false), /* pcrel_offset */
358
359 /* A 32-bit offset from GOT to (local const) symbol: no GOT entry should
360 be necessary. */
361 HOWTO (R_CRIS_32_GOTREL, /* type */
362 0, /* rightshift */
363 2, /* size (0 = byte, 1 = short, 2 = long) */
364 32, /* bitsize */
365 false, /* pc_relative */
366 0, /* bitpos */
367 complain_overflow_bitfield, /* complain_on_overflow */
368 bfd_elf_generic_reloc, /* special_function */
369 "R_CRIS_32_GOTREL", /* name */
370 false, /* partial_inplace */
371 0, /* src_mask */
372 0xffffffff, /* dst_mask */
373 false), /* pcrel_offset */
374
375 /* A 32-bit offset from GOT to entry for this symbol in PLT and request
376 to create PLT entry for symbol. */
377 HOWTO (R_CRIS_32_PLT_GOTREL, /* type */
378 0, /* rightshift */
379 2, /* size (0 = byte, 1 = short, 2 = long) */
380 32, /* bitsize */
381 false, /* pc_relative */
382 0, /* bitpos */
383 complain_overflow_bitfield, /* complain_on_overflow */
384 bfd_elf_generic_reloc, /* special_function */
385 "R_CRIS_32_PLT_GOTREL", /* name */
386 false, /* partial_inplace */
387 0, /* src_mask */
388 0xffffffff, /* dst_mask */
389 false), /* pcrel_offset */
390
391 /* A 32-bit offset from PC (location after the relocation) + addend to
392 entry for this symbol in PLT and request to create PLT entry for
393 symbol. */
394 HOWTO (R_CRIS_32_PLT_PCREL, /* type */
395 0, /* rightshift */
396 2, /* size (0 = byte, 1 = short, 2 = long) */
397 32, /* bitsize */
398 true, /* pc_relative */
399 0, /* bitpos */
400 complain_overflow_bitfield, /* complain_on_overflow */
401 bfd_elf_generic_reloc, /* special_function */
402 "R_CRIS_32_PLT_PCREL", /* name */
403 false, /* partial_inplace */
404 0, /* src_mask */
405 0xffffffff, /* dst_mask */
406 true) /* pcrel_offset */
407 };
408 \f
409 /* Map BFD reloc types to CRIS ELF reloc types. */
410
411 struct cris_reloc_map
412 {
413 bfd_reloc_code_real_type bfd_reloc_val;
414 unsigned int cris_reloc_val;
415 };
416
417 static const struct cris_reloc_map cris_reloc_map [] =
418 {
419 { BFD_RELOC_NONE, R_CRIS_NONE },
420 { BFD_RELOC_8, R_CRIS_8 },
421 { BFD_RELOC_16, R_CRIS_16 },
422 { BFD_RELOC_32, R_CRIS_32 },
423 { BFD_RELOC_8_PCREL, R_CRIS_8_PCREL },
424 { BFD_RELOC_16_PCREL, R_CRIS_16_PCREL },
425 { BFD_RELOC_32_PCREL, R_CRIS_32_PCREL },
426 { BFD_RELOC_VTABLE_INHERIT, R_CRIS_GNU_VTINHERIT },
427 { BFD_RELOC_VTABLE_ENTRY, R_CRIS_GNU_VTENTRY },
428 { BFD_RELOC_CRIS_COPY, R_CRIS_COPY },
429 { BFD_RELOC_CRIS_GLOB_DAT, R_CRIS_GLOB_DAT },
430 { BFD_RELOC_CRIS_JUMP_SLOT, R_CRIS_JUMP_SLOT },
431 { BFD_RELOC_CRIS_RELATIVE, R_CRIS_RELATIVE },
432 { BFD_RELOC_CRIS_16_GOT, R_CRIS_16_GOT },
433 { BFD_RELOC_CRIS_32_GOT, R_CRIS_32_GOT },
434 { BFD_RELOC_CRIS_16_GOTPLT, R_CRIS_16_GOTPLT },
435 { BFD_RELOC_CRIS_32_GOTPLT, R_CRIS_32_GOTPLT },
436 { BFD_RELOC_CRIS_32_GOTREL, R_CRIS_32_GOTREL },
437 { BFD_RELOC_CRIS_32_PLT_GOTREL, R_CRIS_32_PLT_GOTREL },
438 { BFD_RELOC_CRIS_32_PLT_PCREL, R_CRIS_32_PLT_PCREL }
439 };
440
441 static reloc_howto_type *
442 cris_reloc_type_lookup (abfd, code)
443 bfd * abfd ATTRIBUTE_UNUSED;
444 bfd_reloc_code_real_type code;
445 {
446 unsigned int i;
447
448 for (i = 0; i < sizeof (cris_reloc_map) / sizeof (cris_reloc_map[0]); i++)
449 if (cris_reloc_map [i].bfd_reloc_val == code)
450 return & cris_elf_howto_table [cris_reloc_map[i].cris_reloc_val];
451
452 return NULL;
453 }
454
455 /* Set the howto pointer for an CRIS ELF reloc. */
456
457 static void
458 cris_info_to_howto_rela (abfd, cache_ptr, dst)
459 bfd * abfd ATTRIBUTE_UNUSED;
460 arelent * cache_ptr;
461 Elf32_Internal_Rela * dst;
462 {
463 unsigned int r_type;
464
465 r_type = ELF32_R_TYPE (dst->r_info);
466 BFD_ASSERT (r_type < (unsigned int) R_CRIS_max);
467 cache_ptr->howto = & cris_elf_howto_table [r_type];
468 }
469 \f
470 /* Support for core dump NOTE sections. */
471
472 static boolean
473 cris_elf_grok_prstatus (abfd, note)
474 bfd *abfd;
475 Elf_Internal_Note *note;
476 {
477 int offset;
478 size_t raw_size;
479
480 switch (note->descsz)
481 {
482 default:
483 return false;
484
485 case 214: /* Linux/CRIS */
486 /* pr_cursig */
487 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
488
489 /* pr_pid */
490 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 22);
491
492 /* pr_reg */
493 offset = 70;
494 raw_size = 140;
495
496 break;
497 }
498
499 /* Make a ".reg/999" section. */
500 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
501 raw_size, note->descpos + offset);
502 }
503
504 static boolean
505 cris_elf_grok_psinfo (abfd, note)
506 bfd *abfd;
507 Elf_Internal_Note *note;
508 {
509 switch (note->descsz)
510 {
511 default:
512 return false;
513
514 case 124: /* Linux/CRIS elf_prpsinfo */
515 elf_tdata (abfd)->core_program
516 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
517 elf_tdata (abfd)->core_command
518 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
519 }
520
521 /* Note that for some reason, a spurious space is tacked
522 onto the end of the args in some (at least one anyway)
523 implementations, so strip it off if it exists. */
524
525 {
526 char *command = elf_tdata (abfd)->core_command;
527 int n = strlen (command);
528
529 if (0 < n && command[n - 1] == ' ')
530 command[n - 1] = '\0';
531 }
532
533 return true;
534 }
535 \f
536 /* The name of the dynamic interpreter. This is put in the .interp
537 section. */
538
539 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
540
541 /* The size in bytes of an entry in the procedure linkage table. */
542
543 #define PLT_ENTRY_SIZE 20
544
545 /* The first entry in an absolute procedure linkage table looks like this. */
546
547 static const bfd_byte elf_cris_plt0_entry[PLT_ENTRY_SIZE] =
548 {
549 0xfc, 0xe1,
550 0x7e, 0x7e, /* push mof. */
551 0x7f, 0x0d, /* (dip [pc+]) */
552 0, 0, 0, 0, /* Replaced with address of .got + 4. */
553 0x30, 0x7a, /* move [...],mof */
554 0x7f, 0x0d, /* (dip [pc+]) */
555 0, 0, 0, 0, /* Replaced with address of .got + 8. */
556 0x30, 0x09, /* jump [...] */
557 };
558
559 /* Subsequent entries in an absolute procedure linkage table look like
560 this. */
561
562 static const bfd_byte elf_cris_plt_entry[PLT_ENTRY_SIZE] =
563 {
564 0x7f, 0x0d, /* (dip [pc+]) */
565 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */
566 0x30, 0x09, /* jump [...] */
567 0x3f, 0x7e, /* move [pc+],mof */
568 0, 0, 0, 0, /* Replaced with offset into relocation table. */
569 0x2f, 0xfe, /* add.d [pc+],pc */
570 0xec, 0xff,
571 0xff, 0xff /* Replaced with offset to start of .plt. */
572 };
573
574 /* The first entry in a PIC procedure linkage table looks like this. */
575
576 static const bfd_byte elf_cris_pic_plt0_entry[PLT_ENTRY_SIZE] =
577 {
578 0xfc, 0xe1, 0x7e, 0x7e, /* push mof */
579 0x04, 0x01, 0x30, 0x7a, /* move [r0+4],mof */
580 0x08, 0x01, 0x30, 0x09, /* jump [r0+8] */
581 0, 0, 0, 0, 0, 0, 0, 0, /* Pad out to 20 bytes. */
582 };
583
584 /* Subsequent entries in a PIC procedure linkage table look like this. */
585
586 static const bfd_byte elf_cris_pic_plt_entry[PLT_ENTRY_SIZE] =
587 {
588 0x6f, 0x0d, /* (bdap [pc+].d,r0) */
589 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */
590 0x30, 0x09, /* jump [...] */
591 0x3f, 0x7e, /* move [pc+],mof */
592 0, 0, 0, 0, /* Replaced with offset into relocation table. */
593 0x2f, 0xfe, /* add.d [pc+],pc */
594 0xec, 0xff, /* Replaced with offset to start of .plt. */
595 0xff, 0xff
596 };
597 \f
598 /* We copy elf32-m68k.c and elf32-i386.c for the basic linker hash bits
599 (and most other PIC/shlib stuff). Check that we don't drift away
600 without reason.
601
602 The CRIS linker, like the m68k and i386 linkers (and probably the rest
603 too) needs to keep track of the number of relocs that it decides to
604 copy in check_relocs for each symbol. This is so that it can discard
605 PC relative relocs if it doesn't need them when linking with
606 -Bsymbolic. We store the information in a field extending the regular
607 ELF linker hash table. */
608
609 /* This structure keeps track of the number of PC relative relocs we have
610 copied for a given symbol. */
611
612 struct elf_cris_pcrel_relocs_copied
613 {
614 /* Next section. */
615 struct elf_cris_pcrel_relocs_copied *next;
616 /* A section in dynobj. */
617 asection *section;
618 /* Number of relocs copied in this section. */
619 bfd_size_type count;
620 };
621
622 /* CRIS ELF linker hash entry. */
623
624 struct elf_cris_link_hash_entry
625 {
626 struct elf_link_hash_entry root;
627
628 /* Number of PC relative relocs copied for this symbol. */
629 struct elf_cris_pcrel_relocs_copied *pcrel_relocs_copied;
630
631 /* The GOTPLT references are CRIS-specific; the goal is to avoid having
632 both a general GOT and a PLT-specific GOT entry for the same symbol,
633 when it is referenced both as a function and as a function pointer.
634
635 Number of GOTPLT references for a function. */
636 bfd_signed_vma gotplt_refcount;
637
638 /* Actual GOTPLT index for this symbol, if applicable, or zero if not
639 (zero is never used as an index). FIXME: We should be able to fold
640 this with gotplt_refcount in a union, like the got and plt unions in
641 elf_link_hash_entry. */
642 bfd_size_type gotplt_offset;
643 };
644
645 /* CRIS ELF linker hash table. */
646
647 struct elf_cris_link_hash_table
648 {
649 struct elf_link_hash_table root;
650
651 /* We can't use the PLT offset and calculate to get the GOTPLT offset,
652 since we try and avoid creating GOTPLT:s when there's already a GOT.
653 Instead, we keep and update the next available index here. */
654 bfd_size_type next_gotplt_entry;
655 };
656
657 /* Traverse a CRIS ELF linker hash table. */
658
659 #define elf_cris_link_hash_traverse(table, func, info) \
660 (elf_link_hash_traverse \
661 (&(table)->root, \
662 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
663 (info)))
664
665 /* Get the CRIS ELF linker hash table from a link_info structure. */
666
667 #define elf_cris_hash_table(p) \
668 ((struct elf_cris_link_hash_table *) (p)->hash)
669
670 /* Create an entry in a CRIS ELF linker hash table. */
671
672 static struct bfd_hash_entry *
673 elf_cris_link_hash_newfunc (entry, table, string)
674 struct bfd_hash_entry *entry;
675 struct bfd_hash_table *table;
676 const char *string;
677 {
678 struct elf_cris_link_hash_entry *ret =
679 (struct elf_cris_link_hash_entry *) entry;
680
681 /* Allocate the structure if it has not already been allocated by a
682 subclass. */
683 if (ret == (struct elf_cris_link_hash_entry *) NULL)
684 ret = ((struct elf_cris_link_hash_entry *)
685 bfd_hash_allocate (table,
686 sizeof (struct elf_cris_link_hash_entry)));
687 if (ret == (struct elf_cris_link_hash_entry *) NULL)
688 return (struct bfd_hash_entry *) ret;
689
690 /* Call the allocation method of the superclass. */
691 ret = ((struct elf_cris_link_hash_entry *)
692 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
693 table, string));
694 if (ret != (struct elf_cris_link_hash_entry *) NULL)
695 {
696 ret->pcrel_relocs_copied = NULL;
697 ret->gotplt_refcount = 0;
698 ret->gotplt_offset = 0;
699 }
700
701 return (struct bfd_hash_entry *) ret;
702 }
703
704 /* Create a CRIS ELF linker hash table. */
705
706 static struct bfd_link_hash_table *
707 elf_cris_link_hash_table_create (abfd)
708 bfd *abfd;
709 {
710 struct elf_cris_link_hash_table *ret;
711 bfd_size_type amt = sizeof (struct elf_cris_link_hash_table);
712
713 ret = ((struct elf_cris_link_hash_table *) bfd_alloc (abfd, amt));
714 if (ret == (struct elf_cris_link_hash_table *) NULL)
715 return NULL;
716
717 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
718 elf_cris_link_hash_newfunc))
719 {
720 bfd_release (abfd, ret);
721 return NULL;
722 }
723
724 /* Initialize to skip over the first three entries in the gotplt; they
725 are used for run-time symbol evaluation. */
726 ret->next_gotplt_entry = 12;
727
728 return &ret->root.root;
729 }
730 \f
731 /* Perform a single relocation. By default we use the standard BFD
732 routines, with a few tweaks. */
733
734 static bfd_reloc_status_type
735 cris_final_link_relocate (howto, input_bfd, input_section, contents, rel,
736 relocation)
737 reloc_howto_type * howto;
738 bfd * input_bfd;
739 asection * input_section;
740 bfd_byte * contents;
741 Elf_Internal_Rela * rel;
742 bfd_vma relocation;
743 {
744 bfd_reloc_status_type r;
745
746 /* PC-relative relocations are relative to the position *after*
747 the reloc. Note that for R_CRIS_8_PCREL the adjustment is
748 not a single byte, since PC must be 16-bit-aligned. */
749 switch (ELF32_R_TYPE (rel->r_info))
750 {
751 /* Check that the 16-bit GOT relocs are positive. */
752 case R_CRIS_16_GOTPLT:
753 case R_CRIS_16_GOT:
754 if ((bfd_signed_vma) relocation < 0)
755 return bfd_reloc_overflow;
756 break;
757
758 case R_CRIS_32_PLT_PCREL:
759 case R_CRIS_32_PCREL:
760 relocation -= 2;
761 /* Fall through. */
762 case R_CRIS_8_PCREL:
763 case R_CRIS_16_PCREL:
764 relocation -= 2;
765 break;
766
767 default:
768 break;
769 }
770
771 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
772 contents, rel->r_offset,
773 relocation, rel->r_addend);
774 return r;
775 }
776 \f
777 /* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was
778 copied, for further comments. */
779
780 static boolean
781 cris_elf_relocate_section (output_bfd, info, input_bfd, input_section,
782 contents, relocs, local_syms, local_sections)
783 bfd * output_bfd ATTRIBUTE_UNUSED;
784 struct bfd_link_info * info;
785 bfd * input_bfd;
786 asection * input_section;
787 bfd_byte * contents;
788 Elf_Internal_Rela * relocs;
789 Elf_Internal_Sym * local_syms;
790 asection ** local_sections;
791 {
792 bfd *dynobj;
793 Elf_Internal_Shdr * symtab_hdr;
794 struct elf_link_hash_entry ** sym_hashes;
795 bfd_vma *local_got_offsets;
796 asection *sgot;
797 asection *splt;
798 asection *sreloc;
799 Elf_Internal_Rela * rel;
800 Elf_Internal_Rela * relend;
801
802 dynobj = elf_hash_table (info)->dynobj;
803 local_got_offsets = elf_local_got_offsets (input_bfd);
804 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
805 sym_hashes = elf_sym_hashes (input_bfd);
806 relend = relocs + input_section->reloc_count;
807
808 /* It seems this can happen with erroneous or unsupported input (mixing
809 a.out and elf in an archive, for example.) */
810 if (sym_hashes == NULL)
811 return false;
812
813 sgot = NULL;
814 splt = NULL;
815 sreloc = NULL;
816
817 if (dynobj != NULL)
818 {
819 splt = bfd_get_section_by_name (dynobj, ".plt");
820 sgot = bfd_get_section_by_name (dynobj, ".got");
821 }
822
823 for (rel = relocs; rel < relend; rel ++)
824 {
825 reloc_howto_type * howto;
826 unsigned long r_symndx;
827 Elf_Internal_Sym * sym;
828 asection * sec;
829 struct elf_link_hash_entry * h;
830 bfd_vma relocation;
831 bfd_reloc_status_type r;
832 const char * symname = NULL;
833 int r_type;
834
835 r_type = ELF32_R_TYPE (rel->r_info);
836
837 if ( r_type == R_CRIS_GNU_VTINHERIT
838 || r_type == R_CRIS_GNU_VTENTRY)
839 continue;
840
841 r_symndx = ELF32_R_SYM (rel->r_info);
842
843 if (info->relocateable)
844 {
845 /* This is a relocateable link. We don't have to change
846 anything, unless the reloc is against a section symbol,
847 in which case we have to adjust according to where the
848 section symbol winds up in the output section. */
849 if (r_symndx < symtab_hdr->sh_info)
850 {
851 sym = local_syms + r_symndx;
852
853 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
854 {
855 sec = local_sections [r_symndx];
856 rel->r_addend += sec->output_offset + sym->st_value;
857 }
858 }
859
860 continue;
861 }
862
863 /* This is a final link. */
864 howto = cris_elf_howto_table + r_type;
865 h = NULL;
866 sym = NULL;
867 sec = NULL;
868
869 if (r_symndx < symtab_hdr->sh_info)
870 {
871 sym = local_syms + r_symndx;
872 sec = local_sections [r_symndx];
873 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
874
875 symname = (bfd_elf_string_from_elf_section
876 (input_bfd, symtab_hdr->sh_link, sym->st_name));
877 if (symname == NULL)
878 symname = bfd_section_name (input_bfd, sec);
879 }
880 else
881 {
882 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
883
884 while (h->root.type == bfd_link_hash_indirect
885 || h->root.type == bfd_link_hash_warning)
886 h = (struct elf_link_hash_entry *) h->root.u.i.link;
887
888 symname = h->root.root.string;
889
890 if (h->root.type == bfd_link_hash_defined
891 || h->root.type == bfd_link_hash_defweak)
892 {
893 sec = h->root.u.def.section;
894
895 /* Perhaps we should detect the cases that
896 sec->output_section is expected to be NULL like i386 and
897 m68k, but apparently (and according to elfxx-ia64.c) all
898 valid cases are where the symbol is defined in a shared
899 object which we link dynamically against. This includes
900 PLT relocs for which we've created a PLT entry and other
901 relocs for which we're prepared to create dynamic
902 relocations.
903
904 For now, new situations cause us to just err when
905 sec->output_offset is NULL but the object with the symbol
906 is *not* dynamically linked against. Thus this will
907 automatically remind us so we can see if there are other
908 valid cases we need to revisit. */
909 if ((sec->output_section == NULL
910 && (sec->owner->flags & DYNAMIC) != 0)
911
912 /* Here follow the cases where the relocation value must
913 be zero (or when further handling is simplified when
914 zero). I can't claim to understand the various
915 conditions and they weren't described in the files
916 where I copied them from (elf32-m68k.c and
917 elf32-i386.c), but let's mention examples of where
918 they happen. FIXME: Perhaps define and use a
919 dynamic_symbol_p function like ia64.
920
921 - When creating a shared library, we can have an
922 ordinary relocation for a symbol defined in a shared
923 library (perhaps the one we create). We then make
924 the relocation value zero, as the value seen now will
925 be added into the relocation addend in this shared
926 library, but must be handled only at dynamic-link
927 time. FIXME: Not sure this example covers the
928 h->elf_link_hash_flags test, though it's there in
929 other targets. */
930 || (info->shared
931 && ((! info->symbolic && h->dynindx != -1)
932 || (h->elf_link_hash_flags
933 & ELF_LINK_HASH_DEF_REGULAR) == 0)
934 && (input_section->flags & SEC_ALLOC) != 0
935 && (r_type == R_CRIS_8
936 || r_type == R_CRIS_16
937 || r_type == R_CRIS_32
938 || r_type == R_CRIS_8_PCREL
939 || r_type == R_CRIS_16_PCREL
940 || r_type == R_CRIS_32_PCREL)))
941 relocation = 0;
942 else if (sec->output_section != NULL)
943 relocation = (h->root.u.def.value
944 + sec->output_section->vma
945 + sec->output_offset);
946 else
947 {
948 (*_bfd_error_handler)
949 (_("%s: unresolvable relocation %s against symbol `%s' from %s section"),
950 bfd_archive_filename (input_bfd),
951 cris_elf_howto_table[r_type].name,
952 symname,
953 bfd_get_section_name (input_bfd, input_section));
954 bfd_set_error (bfd_error_bad_value);
955 return false;
956 }
957 }
958 else if (h->root.type == bfd_link_hash_undefweak)
959 relocation = 0;
960 else if (info->shared
961 && (!info->symbolic || info->allow_shlib_undefined)
962 && !info->no_undefined
963 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
964 relocation = 0;
965 else
966 {
967 if (!(info->callbacks->undefined_symbol
968 (info, symname, input_bfd,
969 input_section, rel->r_offset,
970 (!info->shared || info->no_undefined
971 || ELF_ST_VISIBILITY (h->other)))))
972 return false;
973 relocation = 0;
974 }
975 }
976
977 switch (r_type)
978 {
979 case R_CRIS_16_GOTPLT:
980 case R_CRIS_32_GOTPLT:
981 /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT,
982 but we require a PLT, and the PLT handling will take care of
983 filling in the PLT-specific GOT entry. For the GOT offset,
984 calculate it as we do when filling it in for the .got.plt
985 section. If we don't have a PLT, punt to GOT handling. */
986 if (h != NULL
987 && ((struct elf_cris_link_hash_entry *) h)->gotplt_offset != 0)
988 {
989 asection *sgotplt
990 = bfd_get_section_by_name (dynobj, ".got.plt");
991 bfd_vma got_offset;
992
993 BFD_ASSERT (h->dynindx != -1);
994 BFD_ASSERT (sgotplt != NULL);
995
996 got_offset
997 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset;
998
999 relocation = got_offset;
1000 break;
1001 }
1002
1003 /* We didn't make a PLT entry for this symbol. Maybe everything is
1004 folded into the GOT. Other than folding, this happens when
1005 statically linking PIC code, or when using -Bsymbolic. Check
1006 that we instead have a GOT entry as done for us by
1007 elf_cris_adjust_dynamic_symbol, and drop through into the
1008 ordinary GOT cases. */
1009 if (h != NULL && h->got.offset == (bfd_vma) -1)
1010 {
1011 (*_bfd_error_handler)
1012 (_("%s: No PLT nor GOT for relocation %s against symbol `%s' from %s section"),
1013 bfd_archive_filename (input_bfd),
1014 cris_elf_howto_table[r_type].name,
1015 symname[0] != '\0' ? symname : _("[whose name is lost]"),
1016 bfd_get_section_name (input_bfd, input_section));
1017
1018 /* FIXME: Perhaps blaming input is not the right thing to
1019 do; this is probably an internal error. But it is true
1020 that we didn't like that particular input. */
1021 bfd_set_error (bfd_error_bad_value);
1022 return false;
1023 }
1024 /* Fall through. */
1025
1026 /* The size of the actual relocation is not used here; we only
1027 fill in the GOT table here. */
1028 case R_CRIS_16_GOT:
1029 case R_CRIS_32_GOT:
1030 {
1031 bfd_vma off;
1032
1033 /* Note that despite using RELA relocations, the .got contents
1034 is always filled in with the link-relative relocation
1035 value; the addend. */
1036
1037 if (h != NULL)
1038 {
1039 off = h->got.offset;
1040 BFD_ASSERT (off != (bfd_vma) -1);
1041
1042 if (!elf_hash_table (info)->dynamic_sections_created
1043 || (! info->shared && h->dynindx == -1)
1044 || (info->shared
1045 && (info->symbolic || h->dynindx == -1)
1046 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1047 {
1048 /* This wasn't checked above for ! info->shared, but
1049 must hold there if we get here; the symbol must not
1050 be used in, or defined by a DSO. (Note that
1051 checking for ELF_LINK_HASH_DEF_REGULAR doesn't
1052 catch all cases.) */
1053 BFD_ASSERT (info->shared
1054 || (h->elf_link_hash_flags
1055 & (ELF_LINK_HASH_REF_DYNAMIC
1056 | ELF_LINK_HASH_DEF_DYNAMIC)) == 0);
1057
1058 /* This is actually a static link, or it is a
1059 -Bsymbolic link and the symbol is defined
1060 locally, or the symbol was forced to be local
1061 because of a version file, or we're not creating a
1062 dynamic object and the symbol isn't referred to by
1063 a dynamic object. We must initialize
1064 this entry in the global offset table. Since
1065 the offset must always be a multiple of 4, we
1066 use the least significant bit to record whether
1067 we have initialized it already.
1068
1069 When doing a dynamic link, we create a .rela.got
1070 relocation entry to initialize the value. This
1071 is done in the finish_dynamic_symbol routine. */
1072 if ((off & 1) != 0)
1073 off &= ~1;
1074 else
1075 {
1076 bfd_put_32 (output_bfd, relocation,
1077 sgot->contents + off);
1078 h->got.offset |= 1;
1079 }
1080 }
1081 }
1082 else
1083 {
1084 BFD_ASSERT (local_got_offsets != NULL
1085 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1086
1087 off = local_got_offsets[r_symndx];
1088
1089 /* The offset must always be a multiple of 4. We use
1090 the least significant bit to record whether we have
1091 already generated the necessary reloc. */
1092 if ((off & 1) != 0)
1093 off &= ~1;
1094 else
1095 {
1096 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1097
1098 if (info->shared)
1099 {
1100 asection *srelgot;
1101 Elf_Internal_Rela outrel;
1102
1103 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1104 BFD_ASSERT (srelgot != NULL);
1105
1106 outrel.r_offset = (sgot->output_section->vma
1107 + sgot->output_offset
1108 + off);
1109 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1110 outrel.r_addend = relocation;
1111 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1112 (((Elf32_External_Rela *)
1113 srelgot->contents)
1114 + srelgot->reloc_count));
1115 ++srelgot->reloc_count;
1116 }
1117
1118 local_got_offsets[r_symndx] |= 1;
1119 }
1120 }
1121
1122 relocation = sgot->output_offset + off;
1123 if (rel->r_addend != 0)
1124 {
1125 /* We can't do anything for a relocation which is against
1126 a symbol *plus offset*. GOT holds relocations for
1127 symbols. Make this an error; the compiler isn't
1128 allowed to pass us these kinds of things. */
1129 if (h == NULL)
1130 (*_bfd_error_handler)
1131 (_("%s: relocation %s with non-zero addend %d against local symbol from %s section"),
1132 bfd_archive_filename (input_bfd),
1133 cris_elf_howto_table[r_type].name,
1134 rel->r_addend,
1135 bfd_get_section_name (input_bfd, input_section));
1136 else
1137 (*_bfd_error_handler)
1138 (_("%s: relocation %s with non-zero addend %d against symbol `%s' from %s section"),
1139 bfd_archive_filename (input_bfd),
1140 cris_elf_howto_table[r_type].name,
1141 rel->r_addend,
1142 symname[0] != '\0' ? symname : _("[whose name is lost]"),
1143 bfd_get_section_name (input_bfd, input_section));
1144
1145 bfd_set_error (bfd_error_bad_value);
1146 return false;
1147 }
1148 }
1149 break;
1150
1151 case R_CRIS_32_GOTREL:
1152 /* This relocation must only be performed against local symbols. */
1153 if (h != NULL)
1154 {
1155 (*_bfd_error_handler)
1156 (_("%s: relocation %s is not allowed for global symbol: `%s' from %s section"),
1157 bfd_archive_filename (input_bfd),
1158 cris_elf_howto_table[r_type].name,
1159 symname,
1160 bfd_get_section_name (input_bfd, input_section));
1161 bfd_set_error (bfd_error_bad_value);
1162 return false;
1163 }
1164
1165 /* This relocation is like a PC-relative one, except the
1166 reference point is the location of GOT. Note that
1167 sgot->output_offset is not involved in this calculation. We
1168 always want the start of entire .got section, not the
1169 position after the reserved header. */
1170 relocation -= sgot->output_section->vma;
1171 break;
1172
1173 case R_CRIS_32_PLT_PCREL:
1174 /* Relocation is to the entry for this symbol in the
1175 procedure linkage table. */
1176
1177 /* Resolve a PLT_PCREL reloc against a local symbol directly,
1178 without using the procedure linkage table. */
1179 if (h == NULL)
1180 break;
1181
1182 if (h->plt.offset == (bfd_vma) -1
1183 || splt == NULL)
1184 {
1185 /* We didn't make a PLT entry for this symbol. This
1186 happens when statically linking PIC code, or when
1187 using -Bsymbolic. */
1188 break;
1189 }
1190
1191 relocation = (splt->output_section->vma
1192 + splt->output_offset
1193 + h->plt.offset);
1194 break;
1195
1196 case R_CRIS_32_PLT_GOTREL:
1197 /* Like R_CRIS_32_PLT_PCREL, but the reference point is the
1198 start of the .got section. See also comment at
1199 R_CRIS_32_GOT. */
1200 relocation -= sgot->output_section->vma;
1201
1202 /* Resolve a PLT_GOTREL reloc against a local symbol directly,
1203 without using the procedure linkage table. */
1204 if (h == NULL)
1205 break;
1206
1207 if (h->plt.offset == (bfd_vma) -1
1208 || splt == NULL)
1209 {
1210 /* We didn't make a PLT entry for this symbol. This
1211 happens when statically linking PIC code, or when
1212 using -Bsymbolic. */
1213 break;
1214 }
1215
1216 relocation = (splt->output_section->vma
1217 + splt->output_offset
1218 + h->plt.offset
1219 - sgot->output_section->vma);
1220 break;
1221
1222 case R_CRIS_8_PCREL:
1223 case R_CRIS_16_PCREL:
1224 case R_CRIS_32_PCREL:
1225 /* If the symbol was local, we need no shlib-specific handling. */
1226 if (h == NULL)
1227 break;
1228
1229 /* Fall through. */
1230 case R_CRIS_8:
1231 case R_CRIS_16:
1232 case R_CRIS_32:
1233 if (info->shared
1234 && r_symndx != 0
1235 && (input_section->flags & SEC_ALLOC) != 0
1236 && ((r_type != R_CRIS_8_PCREL
1237 && r_type != R_CRIS_16_PCREL
1238 && r_type != R_CRIS_32_PCREL)
1239 || (!info->symbolic
1240 || (h->elf_link_hash_flags
1241 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1242 {
1243 Elf_Internal_Rela outrel;
1244 boolean skip, relocate;
1245
1246 /* When generating a shared object, these relocations
1247 are copied into the output file to be resolved at run
1248 time. */
1249
1250 if (sreloc == NULL)
1251 {
1252 const char *name;
1253
1254 name = (bfd_elf_string_from_elf_section
1255 (input_bfd,
1256 elf_elfheader (input_bfd)->e_shstrndx,
1257 elf_section_data (input_section)->rel_hdr.sh_name));
1258 if (name == NULL)
1259 return false;
1260
1261 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1262 && strcmp (bfd_get_section_name (input_bfd,
1263 input_section),
1264 name + 5) == 0);
1265
1266 sreloc = bfd_get_section_by_name (dynobj, name);
1267
1268 /* That section should have been created in
1269 cris_elf_check_relocs, but that function will not be
1270 called for objects which fail in
1271 cris_elf_merge_private_bfd_data. */
1272 if (sreloc == NULL)
1273 {
1274 (*_bfd_error_handler)
1275 (_("%s: Internal inconsistency; no relocation section %s"),
1276 bfd_archive_filename (input_bfd),
1277 name);
1278
1279 bfd_set_error (bfd_error_bad_value);
1280 return false;
1281 }
1282 }
1283
1284 skip = false;
1285
1286 outrel.r_offset =
1287 _bfd_elf_section_offset (output_bfd, info, input_section,
1288 rel->r_offset);
1289 if (outrel.r_offset == (bfd_vma) -1)
1290 skip = true;
1291 outrel.r_offset += (input_section->output_section->vma
1292 + input_section->output_offset);
1293
1294 if (skip)
1295 {
1296 memset (&outrel, 0, sizeof outrel);
1297 relocate = false;
1298 }
1299 /* h->dynindx may be -1 if the symbol was marked to
1300 become local. */
1301 else if (h != NULL
1302 && ((! info->symbolic && h->dynindx != -1)
1303 || (h->elf_link_hash_flags
1304 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1305 {
1306 BFD_ASSERT (h->dynindx != -1);
1307 relocate = false;
1308 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1309 outrel.r_addend = relocation + rel->r_addend;
1310 }
1311 else
1312 {
1313 if (r_type == R_CRIS_32)
1314 {
1315 relocate = true;
1316 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1317 outrel.r_addend = relocation + rel->r_addend;
1318 }
1319 else
1320 {
1321 long indx;
1322
1323 if (h == NULL)
1324 sec = local_sections[r_symndx];
1325 else
1326 {
1327 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1328 || (h->root.type
1329 == bfd_link_hash_defweak));
1330 sec = h->root.u.def.section;
1331 }
1332 if (sec != NULL && bfd_is_abs_section (sec))
1333 indx = 0;
1334 else if (sec == NULL || sec->owner == NULL)
1335 {
1336 bfd_set_error (bfd_error_bad_value);
1337 return false;
1338 }
1339 else
1340 {
1341 asection *osec;
1342
1343 osec = sec->output_section;
1344 indx = elf_section_data (osec)->dynindx;
1345 BFD_ASSERT (indx > 0);
1346 }
1347
1348 relocate = false;
1349 outrel.r_info = ELF32_R_INFO (indx, r_type);
1350 outrel.r_addend = relocation + rel->r_addend;
1351 }
1352 }
1353
1354 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1355 (((Elf32_External_Rela *)
1356 sreloc->contents)
1357 + sreloc->reloc_count));
1358 ++sreloc->reloc_count;
1359
1360 /* This reloc will be computed at runtime, so there's no
1361 need to do anything now, except for R_CRIS_32 relocations
1362 that have been turned into R_CRIS_RELATIVE. */
1363 if (!relocate)
1364 continue;
1365 }
1366
1367 break;
1368 }
1369
1370 r = cris_final_link_relocate (howto, input_bfd, input_section,
1371 contents, rel, relocation);
1372
1373 if (r != bfd_reloc_ok)
1374 {
1375 const char * msg = (const char *) NULL;
1376
1377 switch (r)
1378 {
1379 case bfd_reloc_overflow:
1380 r = info->callbacks->reloc_overflow
1381 (info, symname, howto->name, (bfd_vma) 0,
1382 input_bfd, input_section, rel->r_offset);
1383 break;
1384
1385 case bfd_reloc_undefined:
1386 r = info->callbacks->undefined_symbol
1387 (info, symname, input_bfd, input_section, rel->r_offset,
1388 true);
1389 break;
1390
1391 case bfd_reloc_outofrange:
1392 msg = _("internal error: out of range error");
1393 break;
1394
1395 case bfd_reloc_notsupported:
1396 msg = _("internal error: unsupported relocation error");
1397 break;
1398
1399 case bfd_reloc_dangerous:
1400 msg = _("internal error: dangerous relocation");
1401 break;
1402
1403 default:
1404 msg = _("internal error: unknown error");
1405 break;
1406 }
1407
1408 if (msg)
1409 r = info->callbacks->warning
1410 (info, msg, symname, input_bfd, input_section, rel->r_offset);
1411
1412 if (! r)
1413 return false;
1414 }
1415 }
1416
1417 return true;
1418 }
1419 \f
1420 /* Finish up dynamic symbol handling. We set the contents of various
1421 dynamic sections here. */
1422
1423 static boolean
1424 elf_cris_finish_dynamic_symbol (output_bfd, info, h, sym)
1425 bfd *output_bfd;
1426 struct bfd_link_info *info;
1427 struct elf_link_hash_entry *h;
1428 Elf_Internal_Sym *sym;
1429 {
1430 bfd *dynobj;
1431 int plt_off1 = 2, plt_off2 = 10, plt_off3 = 16;
1432
1433 dynobj = elf_hash_table (info)->dynobj;
1434
1435 if (h->plt.offset != (bfd_vma) -1)
1436 {
1437 asection *splt;
1438 asection *sgotplt;
1439 asection *sgot;
1440 asection *srela;
1441 bfd_vma got_base;
1442
1443 bfd_vma gotplt_offset
1444 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset;
1445 Elf_Internal_Rela rela;
1446 boolean has_gotplt = gotplt_offset != 0;
1447
1448 /* Get the index in the procedure linkage table which
1449 corresponds to this symbol. This is the index of this symbol
1450 in all the symbols for which we are making plt entries. The
1451 first entry in the procedure linkage table is reserved. */
1452 /* We have to count backwards here, and the result is only valid as
1453 an index into .got.plt and its relocations. FIXME: Constants... */
1454 bfd_vma gotplt_index = gotplt_offset/4 - 3;
1455
1456 /* Get the offset into the .got table of the entry that corresponds
1457 to this function. Note that we embed knowledge that "incoming"
1458 .got goes after .got.plt in the output without padding (pointer
1459 aligned). However, that knowledge is present in several other
1460 places too, here and in elflink.h at least. */
1461 bfd_vma got_offset
1462 = (has_gotplt
1463 ? gotplt_offset
1464 : h->got.offset + elf_cris_hash_table(info)->next_gotplt_entry);
1465
1466 /* This symbol has an entry in the procedure linkage table. Set it
1467 up. */
1468
1469 BFD_ASSERT (h->dynindx != -1);
1470
1471 splt = bfd_get_section_by_name (dynobj, ".plt");
1472 sgot = bfd_get_section_by_name (dynobj, ".got");
1473 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1474 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1475 BFD_ASSERT (splt != NULL && sgotplt != NULL
1476 && (! has_gotplt || srela != NULL));
1477
1478 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1479
1480 /* Fill in the entry in the procedure linkage table. */
1481 if (! info->shared)
1482 {
1483 memcpy (splt->contents + h->plt.offset, elf_cris_plt_entry,
1484 PLT_ENTRY_SIZE);
1485
1486 /* We need to enter the absolute address of the GOT entry here. */
1487 bfd_put_32 (output_bfd, got_base + got_offset,
1488 splt->contents + h->plt.offset + plt_off1);
1489 }
1490 else
1491 {
1492 memcpy (splt->contents + h->plt.offset, elf_cris_pic_plt_entry,
1493 PLT_ENTRY_SIZE);
1494 bfd_put_32 (output_bfd, got_offset,
1495 splt->contents + h->plt.offset + plt_off1);
1496 }
1497
1498 /* Fill in the plt entry and make a relocation, if this is a "real"
1499 PLT entry. */
1500 if (has_gotplt)
1501 {
1502 /* Fill in the offset into the reloc table. */
1503 bfd_put_32 (output_bfd,
1504 gotplt_index * sizeof (Elf32_External_Rela),
1505 splt->contents + h->plt.offset + plt_off2);
1506
1507 /* Fill in the offset to the first PLT entry, where to "jump". */
1508 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3 + 4),
1509 splt->contents + h->plt.offset + plt_off3);
1510
1511 /* Fill in the entry in the global offset table with the address of
1512 the relocating stub. */
1513 bfd_put_32 (output_bfd,
1514 (splt->output_section->vma
1515 + splt->output_offset
1516 + h->plt.offset
1517 + 8),
1518 sgotplt->contents + got_offset);
1519
1520 /* Fill in the entry in the .rela.plt section. */
1521 rela.r_offset = (sgotplt->output_section->vma
1522 + sgotplt->output_offset
1523 + got_offset);
1524 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_JUMP_SLOT);
1525 rela.r_addend = 0;
1526 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1527 ((Elf32_External_Rela *) srela->contents
1528 + gotplt_index));
1529 }
1530
1531 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1532 {
1533 /* Mark the symbol as undefined, rather than as defined in
1534 the .plt section. Leave the value alone. */
1535 sym->st_shndx = SHN_UNDEF;
1536
1537 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't
1538 know whether resetting the value is significant; if it really
1539 is, rather than a quirk or bug in the sparc port, then I
1540 believe we'd see this elsewhere. */
1541 /* If the symbol is weak, we do need to clear the value.
1542 Otherwise, the PLT entry would provide a definition for
1543 the symbol even if the symbol wasn't defined anywhere,
1544 and so the symbol would never be NULL. */
1545 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
1546 == 0)
1547 sym->st_value = 0;
1548 }
1549 }
1550
1551 /* We don't emit .got relocs for symbols that aren't in the
1552 dynamic-symbols table for an ordinary program. */
1553 if (h->got.offset != (bfd_vma) -1
1554 && (info->shared || h->dynindx != -1))
1555 {
1556 asection *sgot;
1557 asection *srela;
1558 Elf_Internal_Rela rela;
1559 bfd_byte *where;
1560
1561 /* This symbol has an entry in the global offset table. Set it up. */
1562
1563 sgot = bfd_get_section_by_name (dynobj, ".got");
1564 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1565 BFD_ASSERT (sgot != NULL && srela != NULL);
1566
1567 rela.r_offset = (sgot->output_section->vma
1568 + sgot->output_offset
1569 + (h->got.offset &~ (bfd_vma) 1));
1570
1571 /* If this is a static link, or it is a -Bsymbolic link and the
1572 symbol is defined locally or was forced to be local because
1573 of a version file, we just want to emit a RELATIVE reloc.
1574 The entry in the global offset table will already have been
1575 initialized in the relocate_section function. */
1576 where = sgot->contents + (h->got.offset &~ (bfd_vma) 1);
1577 if (! elf_hash_table (info)->dynamic_sections_created
1578 || (info->shared
1579 && (info->symbolic || h->dynindx == -1)
1580 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1581 {
1582 rela.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1583 rela.r_addend = bfd_get_signed_32 (output_bfd, where);
1584 }
1585 else
1586 {
1587 bfd_put_32 (output_bfd, (bfd_vma) 0, where);
1588 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_GLOB_DAT);
1589 rela.r_addend = 0;
1590 }
1591
1592 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1593 ((Elf32_External_Rela *) srela->contents
1594 + srela->reloc_count));
1595 ++srela->reloc_count;
1596 }
1597
1598 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1599 {
1600 asection *s;
1601 Elf_Internal_Rela rela;
1602
1603 /* This symbol needs a copy reloc. Set it up. */
1604
1605 BFD_ASSERT (h->dynindx != -1
1606 && (h->root.type == bfd_link_hash_defined
1607 || h->root.type == bfd_link_hash_defweak));
1608
1609 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1610 ".rela.bss");
1611 BFD_ASSERT (s != NULL);
1612
1613 rela.r_offset = (h->root.u.def.value
1614 + h->root.u.def.section->output_section->vma
1615 + h->root.u.def.section->output_offset);
1616 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_COPY);
1617 rela.r_addend = 0;
1618 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1619 ((Elf32_External_Rela *) s->contents
1620 + s->reloc_count));
1621 ++s->reloc_count;
1622 }
1623
1624 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1625 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1626 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1627 sym->st_shndx = SHN_ABS;
1628
1629 return true;
1630 }
1631 \f
1632 /* Finish up the dynamic sections. */
1633
1634 static boolean
1635 elf_cris_finish_dynamic_sections (output_bfd, info)
1636 bfd *output_bfd;
1637 struct bfd_link_info *info;
1638 {
1639 bfd *dynobj;
1640 asection *sgot;
1641 asection *sdyn;
1642
1643 dynobj = elf_hash_table (info)->dynobj;
1644
1645 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1646 BFD_ASSERT (sgot != NULL);
1647 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1648
1649 if (elf_hash_table (info)->dynamic_sections_created)
1650 {
1651 asection *splt;
1652 Elf32_External_Dyn *dyncon, *dynconend;
1653
1654 splt = bfd_get_section_by_name (dynobj, ".plt");
1655 BFD_ASSERT (splt != NULL && sdyn != NULL);
1656
1657 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1658 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1659 for (; dyncon < dynconend; dyncon++)
1660 {
1661 Elf_Internal_Dyn dyn;
1662 asection *s;
1663
1664 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1665
1666 switch (dyn.d_tag)
1667 {
1668 default:
1669 break;
1670
1671 case DT_PLTGOT:
1672 s = bfd_get_section_by_name (output_bfd, ".got");
1673 BFD_ASSERT (s != NULL);
1674 dyn.d_un.d_ptr = s->vma;
1675 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1676 break;
1677
1678 case DT_JMPREL:
1679 /* Yes, we *can* have a .plt and no .plt.rela, for instance
1680 if all symbols are found in the .got (not .got.plt). */
1681 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1682 dyn.d_un.d_ptr = s != NULL ? s->vma : 0;
1683 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1684 break;
1685
1686 case DT_PLTRELSZ:
1687 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1688 if (s == NULL)
1689 dyn.d_un.d_val = 0;
1690 else if (s->_cooked_size != 0)
1691 dyn.d_un.d_val = s->_cooked_size;
1692 else
1693 dyn.d_un.d_val = s->_raw_size;
1694 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1695 break;
1696
1697 case DT_RELASZ:
1698 /* The procedure linkage table relocs (DT_JMPREL) should
1699 not be included in the overall relocs (DT_RELA).
1700 Therefore, we override the DT_RELASZ entry here to
1701 make it not include the JMPREL relocs. Since the
1702 linker script arranges for .rela.plt to follow all
1703 other relocation sections, we don't have to worry
1704 about changing the DT_RELA entry. */
1705 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1706 if (s != NULL)
1707 {
1708 if (s->_cooked_size != 0)
1709 dyn.d_un.d_val -= s->_cooked_size;
1710 else
1711 dyn.d_un.d_val -= s->_raw_size;
1712 }
1713 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1714 break;
1715 }
1716 }
1717
1718 /* Fill in the first entry in the procedure linkage table. */
1719 if (splt->_raw_size > 0)
1720 {
1721 if (info->shared)
1722 memcpy (splt->contents, elf_cris_pic_plt0_entry, PLT_ENTRY_SIZE);
1723 else
1724 {
1725 memcpy (splt->contents, elf_cris_plt0_entry, PLT_ENTRY_SIZE);
1726 bfd_put_32 (output_bfd,
1727 sgot->output_section->vma + sgot->output_offset + 4,
1728 splt->contents + 6);
1729 bfd_put_32 (output_bfd,
1730 sgot->output_section->vma + sgot->output_offset + 8,
1731 splt->contents + 14);
1732
1733 elf_section_data (splt->output_section)->this_hdr.sh_entsize
1734 = PLT_ENTRY_SIZE;
1735 }
1736 }
1737 }
1738
1739 /* Fill in the first three entries in the global offset table. */
1740 if (sgot->_raw_size > 0)
1741 {
1742 if (sdyn == NULL)
1743 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1744 else
1745 bfd_put_32 (output_bfd,
1746 sdyn->output_section->vma + sdyn->output_offset,
1747 sgot->contents);
1748 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
1749 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
1750 }
1751
1752 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1753
1754 return true;
1755 }
1756 \f
1757 /* Return the section that should be marked against GC for a given
1758 relocation. */
1759
1760 static asection *
1761 cris_elf_gc_mark_hook (abfd, info, rel, h, sym)
1762 bfd * abfd;
1763 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1764 Elf_Internal_Rela * rel;
1765 struct elf_link_hash_entry * h;
1766 Elf_Internal_Sym * sym;
1767 {
1768 if (h != NULL)
1769 {
1770 switch (ELF32_R_TYPE (rel->r_info))
1771 {
1772 case R_CRIS_GNU_VTINHERIT:
1773 case R_CRIS_GNU_VTENTRY:
1774 break;
1775
1776 default:
1777 switch (h->root.type)
1778 {
1779 case bfd_link_hash_defined:
1780 case bfd_link_hash_defweak:
1781 return h->root.u.def.section;
1782
1783 case bfd_link_hash_common:
1784 return h->root.u.c.p->section;
1785
1786 default:
1787 break;
1788 }
1789 }
1790 }
1791 else
1792 {
1793 if (!(elf_bad_symtab (abfd)
1794 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
1795 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
1796 && sym->st_shndx != SHN_COMMON))
1797 {
1798 return bfd_section_from_elf_index (abfd, sym->st_shndx);
1799 }
1800 }
1801
1802 return NULL;
1803 }
1804
1805 /* Update the got entry reference counts for the section being removed. */
1806
1807 static boolean
1808 cris_elf_gc_sweep_hook (abfd, info, sec, relocs)
1809 bfd * abfd ATTRIBUTE_UNUSED;
1810 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1811 asection * sec ATTRIBUTE_UNUSED;
1812 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
1813 {
1814 Elf_Internal_Shdr *symtab_hdr;
1815 struct elf_link_hash_entry **sym_hashes;
1816 bfd_signed_vma *local_got_refcounts;
1817 const Elf_Internal_Rela *rel, *relend;
1818 unsigned long r_symndx;
1819 struct elf_link_hash_entry *h;
1820 bfd *dynobj;
1821 asection *sgot;
1822 asection *srelgot;
1823
1824 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1825 sym_hashes = elf_sym_hashes (abfd);
1826 local_got_refcounts = elf_local_got_refcounts (abfd);
1827
1828 dynobj = elf_hash_table (info)->dynobj;
1829 if (dynobj == NULL)
1830 return true;
1831
1832 sgot = bfd_get_section_by_name (dynobj, ".got");
1833 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1834
1835 relend = relocs + sec->reloc_count;
1836 for (rel = relocs; rel < relend; rel++)
1837 {
1838 switch (ELF32_R_TYPE (rel->r_info))
1839 {
1840 case R_CRIS_16_GOT:
1841 case R_CRIS_32_GOT:
1842 r_symndx = ELF32_R_SYM (rel->r_info);
1843 if (r_symndx >= symtab_hdr->sh_info)
1844 {
1845 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1846 if (h->got.refcount > 0)
1847 {
1848 --h->got.refcount;
1849 if (h->got.refcount == 0)
1850 {
1851 /* We don't need the .got entry any more. */
1852 sgot->_raw_size -= 4;
1853 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
1854 }
1855 }
1856 break;
1857 }
1858
1859 local_got_reloc:
1860 if (local_got_refcounts != NULL)
1861 {
1862 if (local_got_refcounts[r_symndx] > 0)
1863 {
1864 --local_got_refcounts[r_symndx];
1865 if (local_got_refcounts[r_symndx] == 0)
1866 {
1867 /* We don't need the .got entry any more. */
1868 sgot->_raw_size -= 4;
1869 if (info->shared)
1870 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
1871 }
1872 }
1873 }
1874 break;
1875
1876 case R_CRIS_16_GOTPLT:
1877 case R_CRIS_32_GOTPLT:
1878 /* For local symbols, treat these like GOT relocs. */
1879 r_symndx = ELF32_R_SYM (rel->r_info);
1880 if (r_symndx < symtab_hdr->sh_info)
1881 goto local_got_reloc;
1882
1883 case R_CRIS_32_PLT_GOTREL:
1884 /* FIXME: We don't garbage-collect away the .got section. */
1885 if (local_got_refcounts != NULL)
1886 local_got_refcounts[-1]--;
1887 /* Fall through. */
1888
1889 case R_CRIS_8_PCREL:
1890 case R_CRIS_16_PCREL:
1891 case R_CRIS_32_PCREL:
1892 case R_CRIS_32_PLT_PCREL:
1893 r_symndx = ELF32_R_SYM (rel->r_info);
1894 if (r_symndx >= symtab_hdr->sh_info)
1895 {
1896 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1897 if (h->plt.refcount > 0)
1898 --h->plt.refcount;
1899 }
1900 break;
1901
1902 default:
1903 break;
1904 }
1905 }
1906
1907 return true;
1908 }
1909
1910 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1911 entry but we found we will not create any. Called when we find we will
1912 not have any PLT for this symbol, by for example
1913 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link,
1914 or elf_cris_size_dynamic_sections if no dynamic sections will be
1915 created (we're only linking static objects). */
1916
1917 static boolean
1918 elf_cris_adjust_gotplt_to_got (h, p)
1919 struct elf_cris_link_hash_entry *h;
1920 PTR p;
1921 {
1922 struct bfd_link_info *info = (struct bfd_link_info *) p;
1923 bfd *dynobj = elf_hash_table (info)->dynobj;
1924
1925 BFD_ASSERT (dynobj != NULL);
1926
1927 /* If nobody wanted a GOTPLT with this symbol, we're done. */
1928 if (h->gotplt_refcount <= 0)
1929 return true;
1930
1931 if (h->root.got.refcount > 0)
1932 {
1933 /* There's a GOT entry for this symbol. Just adjust the refcount.
1934 Probably not necessary at this stage, but keeping it accurate
1935 helps avoiding surprises later. */
1936 h->root.got.refcount += h->gotplt_refcount;
1937 h->gotplt_refcount = -1;
1938 }
1939 else
1940 {
1941 /* No GOT entry for this symbol. We need to create one. */
1942 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
1943 asection *srelgot
1944 = bfd_get_section_by_name (dynobj, ".rela.got");
1945
1946 /* Put an accurate refcount there. */
1947 h->root.got.refcount = h->gotplt_refcount;
1948
1949 h->gotplt_refcount = -1;
1950
1951 /* We always have a .got section when there are dynamic
1952 relocs. */
1953 BFD_ASSERT (sgot != NULL /* Surely have .got section. */);
1954
1955 /* We might have had a PLT but with no GOT entry and
1956 further no GOT reloc section at all needed before.
1957 Add it. */
1958 if (srelgot == NULL)
1959 {
1960 srelgot = bfd_make_section (dynobj, ".rela.got");
1961
1962 if (srelgot == NULL
1963 || !bfd_set_section_flags (dynobj, srelgot,
1964 (SEC_ALLOC
1965 | SEC_LOAD
1966 | SEC_HAS_CONTENTS
1967 | SEC_IN_MEMORY
1968 | SEC_LINKER_CREATED
1969 | SEC_READONLY))
1970 || !bfd_set_section_alignment (dynobj, srelgot, 2))
1971 return false;
1972 }
1973
1974 /* Allocate space in the .got section. */
1975 sgot->_raw_size += 4;
1976
1977 /* Allocate relocation space. */
1978 srelgot->_raw_size += sizeof (Elf32_External_Rela);
1979 }
1980
1981 return true;
1982 }
1983
1984 /* Try to fold PLT entries with GOT entries. There are two cases when we
1985 want to do this:
1986
1987 - When all PLT references are GOTPLT references, and there are GOT
1988 references. We don't have to generate a PLT at all.
1989
1990 - When there are both (ordinary) PLT references and GOT references.
1991 We want to make the PLT reference use the ordinary GOT entry rather
1992 than a run-time dynamically resolved GOTPLT entry (since the GOT
1993 entry will have to be resolved at startup anyway).
1994
1995 Though the latter case is handled when room for the PLT is allocated,
1996 not here.
1997
1998 Note that this function is called before symbols are forced local by
1999 version scripts. The differing cases are handled by
2000 elf_cris_hide_symbol. */
2001
2002 static boolean
2003 elf_cris_try_fold_plt_to_got (h, p)
2004 struct elf_cris_link_hash_entry *h;
2005 PTR p;
2006 {
2007 struct bfd_link_info *info = (struct bfd_link_info *) p;
2008
2009 /* If there are no GOT references for this symbol, we can't fold any
2010 other reference so there's nothing to do. Likewise if there are no
2011 PLT references; GOTPLT references included. */
2012 if (h->root.got.refcount <= 0 || h->root.plt.refcount <= 0)
2013 return true;
2014
2015 /* GOTPLT relocs are supposed to be included into the PLT refcount. */
2016 BFD_ASSERT (h->gotplt_refcount <= h->root.plt.refcount);
2017
2018 if (h->gotplt_refcount == h->root.plt.refcount)
2019 {
2020 /* The only PLT references are GOTPLT references, and there are GOT
2021 references. Convert PLT to GOT references. */
2022 if (! elf_cris_adjust_gotplt_to_got (h, info))
2023 return false;
2024
2025 /* Clear the PLT references, so no PLT will be created. */
2026 h->root.plt.offset = (bfd_vma) -1;
2027 }
2028
2029 return true;
2030 }
2031
2032 /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc
2033 to use a GOT entry (and create one) rather than requiring a GOTPLT
2034 entry. */
2035
2036 static void
2037 elf_cris_hide_symbol (info, h)
2038 struct bfd_link_info *info;
2039 struct elf_link_hash_entry *h;
2040 {
2041 elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info);
2042
2043 _bfd_elf_link_hash_hide_symbol (info, h);
2044 }
2045
2046 /* Adjust a symbol defined by a dynamic object and referenced by a
2047 regular object. The current definition is in some section of the
2048 dynamic object, but we're not including those sections. We have to
2049 change the definition to something the rest of the link can
2050 understand. */
2051
2052 static boolean
2053 elf_cris_adjust_dynamic_symbol (info, h)
2054 struct bfd_link_info *info;
2055 struct elf_link_hash_entry *h;
2056 {
2057 bfd *dynobj;
2058 asection *s;
2059 unsigned int power_of_two;
2060
2061 dynobj = elf_hash_table (info)->dynobj;
2062
2063 /* Make sure we know what is going on here. */
2064 BFD_ASSERT (dynobj != NULL
2065 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
2066 || h->weakdef != NULL
2067 || ((h->elf_link_hash_flags
2068 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2069 && (h->elf_link_hash_flags
2070 & ELF_LINK_HASH_REF_REGULAR) != 0
2071 && (h->elf_link_hash_flags
2072 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
2073
2074 /* If this is a function, put it in the procedure linkage table. We
2075 will fill in the contents of the procedure linkage table later,
2076 when we know the address of the .got section. */
2077 if (h->type == STT_FUNC
2078 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
2079 {
2080 if (! info->shared
2081 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
2082 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
2083 /* We must always create the plt entry if it was referenced by a
2084 PLT relocation. In this case we already recorded it as a
2085 dynamic symbol. */
2086 /* FIXME: m68k and i386 differ here, for unclear reasons. */
2087 && h->dynindx == -1)
2088 {
2089 /* This case can occur if we saw a PLT reloc in an input file,
2090 but the symbol was never referred to by a dynamic object. In
2091 such a case, we don't actually need to build a procedure
2092 linkage table, and we can just do a PC reloc instead, or
2093 change a .got.plt index to a .got index for GOTPLT relocs. */
2094 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
2095 h->plt.offset = (bfd_vma) -1;
2096
2097 return
2098 elf_cris_adjust_gotplt_to_got ((struct
2099 elf_cris_link_hash_entry *) h,
2100 info);
2101 }
2102
2103 /* If there are only GOT references and GOTPLT references to this
2104 PLT entry, get rid of the PLT. */
2105 if (! elf_cris_try_fold_plt_to_got ((struct elf_cris_link_hash_entry *)
2106 h, info))
2107 return false;
2108
2109 /* GC or folding may have rendered this entry unused. */
2110 if (h->plt.refcount <= 0)
2111 {
2112 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
2113 h->plt.offset = (bfd_vma) -1;
2114 return true;
2115 }
2116
2117 /* Make sure this symbol is output as a dynamic symbol. */
2118 if (h->dynindx == -1)
2119 {
2120 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
2121 return false;
2122 }
2123
2124 s = bfd_get_section_by_name (dynobj, ".plt");
2125 BFD_ASSERT (s != NULL);
2126
2127 /* If this is the first .plt entry, make room for the special
2128 first entry. */
2129 if (s->_raw_size == 0)
2130 s->_raw_size += PLT_ENTRY_SIZE;
2131
2132 /* If this symbol is not defined in a regular file, and we are
2133 not generating a shared library, then set the symbol to this
2134 location in the .plt. This is required to make function
2135 pointers compare as equal between the normal executable and
2136 the shared library. */
2137 if (!info->shared
2138 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2139 {
2140 h->root.u.def.section = s;
2141 h->root.u.def.value = s->_raw_size;
2142 }
2143
2144 /* If there's already a GOT entry, use that, not a .got.plt. A
2145 GOT field still has a reference count when we get here; it's
2146 not yet changed to an offset. */
2147 if (h->got.refcount > 0)
2148 {
2149 h->got.refcount += h->plt.refcount;
2150
2151 /* Mark the PLT offset to use the GOT entry by setting the low
2152 bit in the plt offset; it is always a multiple of
2153 pointer-size. */
2154 BFD_ASSERT ((s->_raw_size & 3) == 0);
2155
2156 /* Change the PLT refcount to an offset. */
2157 h->plt.offset = s->_raw_size;
2158
2159 /* By not setting gotplt_offset (i.e. it remains at 0), we signal
2160 that the got entry should be used instead. */
2161 BFD_ASSERT (((struct elf_cris_link_hash_entry *)
2162 h)->gotplt_offset == 0);
2163
2164 /* Make room for this entry. */
2165 s->_raw_size += PLT_ENTRY_SIZE;
2166
2167 return true;
2168 }
2169
2170 /* No GOT reference for this symbol; prepare for an ordinary PLT. */
2171 h->plt.offset = s->_raw_size;
2172
2173 /* Make room for this entry. */
2174 s->_raw_size += PLT_ENTRY_SIZE;
2175
2176 /* We also need to make an entry in the .got.plt section, which
2177 will be placed in the .got section by the linker script. */
2178 ((struct elf_cris_link_hash_entry *) h)->gotplt_offset
2179 = elf_cris_hash_table (info)->next_gotplt_entry;
2180 elf_cris_hash_table (info)->next_gotplt_entry += 4;
2181
2182 s = bfd_get_section_by_name (dynobj, ".got.plt");
2183 BFD_ASSERT (s != NULL);
2184 s->_raw_size += 4;
2185
2186 /* We also need to make an entry in the .rela.plt section. */
2187
2188 s = bfd_get_section_by_name (dynobj, ".rela.plt");
2189 BFD_ASSERT (s != NULL);
2190 s->_raw_size += sizeof (Elf32_External_Rela);
2191
2192 return true;
2193 }
2194
2195 /* Reinitialize the plt offset now that it is not used as a reference
2196 count any more. */
2197 h->plt.offset = (bfd_vma) -1;
2198
2199 /* If this is a weak symbol, and there is a real definition, the
2200 processor independent code will have arranged for us to see the
2201 real definition first, and we can just use the same value. */
2202 if (h->weakdef != NULL)
2203 {
2204 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
2205 || h->weakdef->root.type == bfd_link_hash_defweak);
2206 h->root.u.def.section = h->weakdef->root.u.def.section;
2207 h->root.u.def.value = h->weakdef->root.u.def.value;
2208 return true;
2209 }
2210
2211 /* This is a reference to a symbol defined by a dynamic object which
2212 is not a function. */
2213
2214 /* If we are creating a shared library, we must presume that the
2215 only references to the symbol are via the global offset table.
2216 For such cases we need not do anything here; the relocations will
2217 be handled correctly by relocate_section. */
2218 if (info->shared)
2219 return true;
2220
2221 /* If there are no references to this symbol that do not use the
2222 GOT, we don't need to generate a copy reloc. */
2223 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
2224 return true;
2225
2226 /* We must allocate the symbol in our .dynbss section, which will
2227 become part of the .bss section of the executable. There will be
2228 an entry for this symbol in the .dynsym section. The dynamic
2229 object will contain position independent code, so all references
2230 from the dynamic object to this symbol will go through the global
2231 offset table. The dynamic linker will use the .dynsym entry to
2232 determine the address it must put in the global offset table, so
2233 both the dynamic object and the regular object will refer to the
2234 same memory location for the variable. */
2235
2236 s = bfd_get_section_by_name (dynobj, ".dynbss");
2237 BFD_ASSERT (s != NULL);
2238
2239 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to
2240 copy the initial value out of the dynamic object and into the
2241 runtime process image. We need to remember the offset into the
2242 .rela.bss section we are going to use. */
2243 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2244 {
2245 asection *srel;
2246
2247 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
2248 BFD_ASSERT (srel != NULL);
2249 srel->_raw_size += sizeof (Elf32_External_Rela);
2250 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
2251 }
2252
2253 /* Historic precedent: m68k and i386 allow max 8-byte alignment for the
2254 thing to copy; so do we. */
2255
2256 /* We need to figure out the alignment required for this symbol. I
2257 have no idea how ELF linkers handle this. */
2258 power_of_two = bfd_log2 (h->size);
2259 if (power_of_two > 3)
2260 power_of_two = 3;
2261
2262 /* Apply the required alignment. */
2263 s->_raw_size = BFD_ALIGN (s->_raw_size,
2264 (bfd_size_type) (1 << power_of_two));
2265 if (power_of_two > bfd_get_section_alignment (dynobj, s))
2266 {
2267 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
2268 return false;
2269 }
2270
2271 /* Define the symbol as being at this point in the section. */
2272 h->root.u.def.section = s;
2273 h->root.u.def.value = s->_raw_size;
2274
2275 /* Increment the section size to make room for the symbol. */
2276 s->_raw_size += h->size;
2277
2278 return true;
2279 }
2280
2281 /* Look through the relocs for a section during the first phase. */
2282
2283 static boolean
2284 cris_elf_check_relocs (abfd, info, sec, relocs)
2285 bfd *abfd;
2286 struct bfd_link_info *info;
2287 asection *sec;
2288 const Elf_Internal_Rela *relocs;
2289 {
2290 bfd *dynobj;
2291 Elf_Internal_Shdr *symtab_hdr;
2292 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
2293 bfd_signed_vma *local_got_refcounts;
2294 const Elf_Internal_Rela *rel;
2295 const Elf_Internal_Rela *rel_end;
2296 asection *sgot;
2297 asection *srelgot;
2298 asection *sreloc;
2299
2300 if (info->relocateable)
2301 return true;
2302
2303 dynobj = elf_hash_table (info)->dynobj;
2304 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2305 sym_hashes = elf_sym_hashes (abfd);
2306 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
2307 local_got_refcounts = elf_local_got_refcounts (abfd);
2308
2309 sgot = NULL;
2310 srelgot = NULL;
2311 sreloc = NULL;
2312
2313 if (!elf_bad_symtab (abfd))
2314 sym_hashes_end -= symtab_hdr->sh_info;
2315
2316 rel_end = relocs + sec->reloc_count;
2317 for (rel = relocs; rel < rel_end; rel++)
2318 {
2319 struct elf_link_hash_entry *h;
2320 unsigned long r_symndx;
2321 enum elf_cris_reloc_type r_type;
2322
2323 r_symndx = ELF32_R_SYM (rel->r_info);
2324 if (r_symndx < symtab_hdr->sh_info)
2325 h = NULL;
2326 else
2327 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2328
2329 r_type = ELF32_R_TYPE (rel->r_info);
2330
2331 /* Some relocs require linker-created sections; we need to hang them
2332 on the first input bfd we found that contained dynamic relocs. */
2333 switch (r_type)
2334 {
2335 case R_CRIS_16_GOT:
2336 case R_CRIS_32_GOT:
2337 case R_CRIS_32_GOTREL:
2338 case R_CRIS_32_PLT_GOTREL:
2339 case R_CRIS_32_PLT_PCREL:
2340 case R_CRIS_16_GOTPLT:
2341 case R_CRIS_32_GOTPLT:
2342 if (dynobj == NULL)
2343 {
2344 elf_hash_table (info)->dynobj = dynobj = abfd;
2345
2346 /* Create the .got section, so we can assume it's always
2347 present whenever there's a dynobj. */
2348 if (!_bfd_elf_create_got_section (dynobj, info))
2349 return false;
2350 }
2351 break;
2352
2353 default:
2354 break;
2355 }
2356
2357 /* Some relocs require a global offset table (but perhaps not a
2358 specific GOT entry). */
2359 switch (r_type)
2360 {
2361 case R_CRIS_16_GOT:
2362 case R_CRIS_32_GOT:
2363 case R_CRIS_32_GOTREL:
2364 case R_CRIS_32_PLT_GOTREL:
2365 if (sgot == NULL)
2366 sgot = bfd_get_section_by_name (dynobj, ".got");
2367
2368 if (local_got_refcounts == NULL)
2369 {
2370 bfd_size_type amt;
2371
2372 /* We use index local_got_refcounts[-1] to count all
2373 GOT-relative relocations that do not have explicit
2374 GOT entries. */
2375 amt = symtab_hdr->sh_info + 1;
2376 amt *= sizeof (bfd_signed_vma);
2377 local_got_refcounts = ((bfd_signed_vma *) bfd_zalloc (abfd, amt));
2378 if (local_got_refcounts == NULL)
2379 return false;
2380
2381 local_got_refcounts++;
2382 elf_local_got_refcounts (abfd) = local_got_refcounts;
2383 }
2384 break;
2385
2386 default:
2387 break;
2388 }
2389
2390 switch (r_type)
2391 {
2392 case R_CRIS_16_GOTPLT:
2393 case R_CRIS_32_GOTPLT:
2394 /* Mark that we need a GOT entry if the PLT entry (and its GOT
2395 entry) is eliminated. We can only do this for a non-local
2396 symbol. */
2397 if (h != NULL)
2398 {
2399 ((struct elf_cris_link_hash_entry *) h)->gotplt_refcount++;
2400 goto handle_gotplt_reloc;
2401 }
2402 /* If h is NULL then this is a local symbol, and we must make a
2403 GOT entry for it, so handle it like a GOT reloc. */
2404 /* Fall through. */
2405
2406 case R_CRIS_16_GOT:
2407 case R_CRIS_32_GOT:
2408 /* This symbol requires a global offset table entry. */
2409
2410 if (srelgot == NULL
2411 && (h != NULL || info->shared))
2412 {
2413 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2414 if (srelgot == NULL)
2415 {
2416 srelgot = bfd_make_section (dynobj, ".rela.got");
2417 if (srelgot == NULL
2418 || !bfd_set_section_flags (dynobj, srelgot,
2419 (SEC_ALLOC
2420 | SEC_LOAD
2421 | SEC_HAS_CONTENTS
2422 | SEC_IN_MEMORY
2423 | SEC_LINKER_CREATED
2424 | SEC_READONLY))
2425 || !bfd_set_section_alignment (dynobj, srelgot, 2))
2426 return false;
2427 }
2428 }
2429
2430 if (h != NULL)
2431 {
2432 if (h->got.refcount == 0)
2433 {
2434 /* Make sure this symbol is output as a dynamic symbol. */
2435 if (h->dynindx == -1)
2436 {
2437 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
2438 return false;
2439 }
2440
2441 /* Allocate space in the .got section. */
2442 sgot->_raw_size += 4;
2443 /* Allocate relocation space. */
2444 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2445 }
2446 h->got.refcount++;
2447 }
2448 else
2449 {
2450 /* This is a global offset table entry for a local symbol. */
2451 if (local_got_refcounts[r_symndx] == 0)
2452 {
2453 sgot->_raw_size += 4;
2454 if (info->shared)
2455 {
2456 /* If we are generating a shared object, we need to
2457 output a R_CRIS_RELATIVE reloc so that the dynamic
2458 linker can adjust this GOT entry. */
2459 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2460 }
2461 }
2462 local_got_refcounts[r_symndx]++;
2463 }
2464 break;
2465
2466 case R_CRIS_32_GOTREL:
2467 /* This reference requires a global offset table.
2468 FIXME: The actual refcount isn't used currently; the .got
2469 section can't be removed if there were any references in the
2470 input. */
2471 local_got_refcounts[-1]++;
2472 break;
2473
2474 handle_gotplt_reloc:
2475
2476 case R_CRIS_32_PLT_GOTREL:
2477 /* This reference requires a global offset table. */
2478 local_got_refcounts[-1]++;
2479 /* Fall through. */
2480
2481 case R_CRIS_32_PLT_PCREL:
2482 /* This symbol requires a procedure linkage table entry. We
2483 actually build the entry in adjust_dynamic_symbol,
2484 because this might be a case of linking PIC code which is
2485 never referenced by a dynamic object, in which case we
2486 don't need to generate a procedure linkage table entry
2487 after all. */
2488
2489 /* If this is a local symbol, we resolve it directly without
2490 creating a procedure linkage table entry. */
2491 if (h == NULL)
2492 continue;
2493
2494 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
2495 h->plt.refcount++;
2496 break;
2497
2498 case R_CRIS_8:
2499 case R_CRIS_16:
2500 case R_CRIS_32:
2501 /* Let's help debug shared library creation. Any of these
2502 relocs can be used in shared libs, but pages containing them
2503 cannot be shared. Don't warn for sections we don't care
2504 about, such as debug sections or non-constant sections. We
2505 can't help tables of (global) function pointers, for example,
2506 though they must be emitted in a data section to avoid having
2507 impure text sections. */
2508 if (info->shared
2509 && (sec->flags & SEC_ALLOC) != 0
2510 && (sec->flags & SEC_READONLY) != 0)
2511 {
2512 /* FIXME: How do we make this optionally a warning only? */
2513 (*_bfd_error_handler)
2514 (_("%s, section %s:\n relocation %s should not be used in a shared object; recompile with -fPIC"),
2515 bfd_archive_filename (abfd),
2516 sec->name,
2517 cris_elf_howto_table[r_type].name);
2518 }
2519 /* Fall through. */
2520
2521 case R_CRIS_8_PCREL:
2522 case R_CRIS_16_PCREL:
2523 case R_CRIS_32_PCREL:
2524 if (h != NULL)
2525 {
2526 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
2527
2528 /* Make sure a plt entry is created for this symbol if it
2529 turns out to be a function defined by a dynamic object. */
2530 h->plt.refcount++;
2531 }
2532
2533 /* If we are creating a shared library and this is not a local
2534 symbol, we need to copy the reloc into the shared library.
2535 However when linking with -Bsymbolic and this is a global
2536 symbol which is defined in an object we are including in the
2537 link (i.e., DEF_REGULAR is set), then we can resolve the
2538 reloc directly. At this point we have not seen all the input
2539 files, so it is possible that DEF_REGULAR is not set now but
2540 will be set later (it is never cleared). In case of a weak
2541 definition, DEF_REGULAR may be cleared later by a strong
2542 definition in a shared library. We account for that
2543 possibility below by storing information in the relocs_copied
2544 field of the hash table entry. A similar situation occurs
2545 when creating shared libraries and symbol visibility changes
2546 render the symbol local. */
2547
2548 /* No need to do anything if we're not creating a shared object. */
2549 if (! info->shared)
2550 break;
2551
2552 /* We don't need to handle relocs into sections not going into
2553 the "real" output. */
2554 if ((sec->flags & SEC_ALLOC) == 0)
2555 break;
2556
2557 /* We can only eliminate PC-relative relocs. */
2558 if (r_type == R_CRIS_8_PCREL
2559 || r_type == R_CRIS_16_PCREL
2560 || r_type == R_CRIS_32_PCREL)
2561 {
2562 /* If the symbol is local, then we can eliminate the reloc. */
2563 if (h == NULL)
2564 break;
2565
2566 /* If this is with -Bsymbolic and the symbol isn't weak, and
2567 is defined by an ordinary object (the ones we include in
2568 this shared library) then we can also eliminate the
2569 reloc. See comment above for more eliminable cases which
2570 we can't identify at this time. */
2571 if (info->symbolic
2572 && h->root.type != bfd_link_hash_defweak
2573 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
2574 break;
2575 }
2576
2577 /* We create a reloc section in dynobj and make room for this
2578 reloc. */
2579 if (sreloc == NULL)
2580 {
2581 const char *name;
2582
2583 name = (bfd_elf_string_from_elf_section
2584 (abfd,
2585 elf_elfheader (abfd)->e_shstrndx,
2586 elf_section_data (sec)->rel_hdr.sh_name));
2587 if (name == NULL)
2588 return false;
2589
2590 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
2591 && strcmp (bfd_get_section_name (abfd, sec),
2592 name + 5) == 0);
2593
2594 sreloc = bfd_get_section_by_name (dynobj, name);
2595 if (sreloc == NULL)
2596 {
2597 sreloc = bfd_make_section (dynobj, name);
2598 if (sreloc == NULL
2599 || !bfd_set_section_flags (dynobj, sreloc,
2600 (SEC_ALLOC
2601 | SEC_LOAD
2602 | SEC_HAS_CONTENTS
2603 | SEC_IN_MEMORY
2604 | SEC_LINKER_CREATED
2605 | SEC_READONLY))
2606 || !bfd_set_section_alignment (dynobj, sreloc, 2))
2607 return false;
2608 }
2609 if (sec->flags & SEC_READONLY)
2610 info->flags |= DF_TEXTREL;
2611 }
2612
2613 sreloc->_raw_size += sizeof (Elf32_External_Rela);
2614
2615 /* If we are linking with -Bsymbolic, we count the number of PC
2616 relative relocations we have entered for this symbol, so that
2617 we can discard them again if the symbol is later defined by a
2618 regular object. We know that h is really a pointer to an
2619 elf_cris_link_hash_entry. */
2620 if ((r_type == R_CRIS_8_PCREL
2621 || r_type == R_CRIS_16_PCREL
2622 || r_type == R_CRIS_32_PCREL)
2623 && info->symbolic)
2624 {
2625 struct elf_cris_link_hash_entry *eh;
2626 struct elf_cris_pcrel_relocs_copied *p;
2627
2628 eh = (struct elf_cris_link_hash_entry *) h;
2629
2630 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
2631 if (p->section == sreloc)
2632 break;
2633
2634 if (p == NULL)
2635 {
2636 p = ((struct elf_cris_pcrel_relocs_copied *)
2637 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
2638 if (p == NULL)
2639 return false;
2640 p->next = eh->pcrel_relocs_copied;
2641 eh->pcrel_relocs_copied = p;
2642 p->section = sreloc;
2643 p->count = 0;
2644 }
2645
2646 ++p->count;
2647 }
2648 break;
2649
2650 /* This relocation describes the C++ object vtable hierarchy.
2651 Reconstruct it for later use during GC. */
2652 case R_CRIS_GNU_VTINHERIT:
2653 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2654 return false;
2655 break;
2656
2657 /* This relocation describes which C++ vtable entries are actually
2658 used. Record for later use during GC. */
2659 case R_CRIS_GNU_VTENTRY:
2660 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2661 return false;
2662 break;
2663
2664 default:
2665 /* Other relocs do not appear here. */
2666 bfd_set_error (bfd_error_bad_value);
2667 return false;
2668 }
2669 }
2670
2671 return true;
2672 }
2673
2674 /* Set the sizes of the dynamic sections. */
2675
2676 static boolean
2677 elf_cris_size_dynamic_sections (output_bfd, info)
2678 bfd *output_bfd ATTRIBUTE_UNUSED;
2679 struct bfd_link_info *info;
2680 {
2681 bfd *dynobj;
2682 asection *s;
2683 boolean plt;
2684 boolean relocs;
2685
2686 dynobj = elf_hash_table (info)->dynobj;
2687 BFD_ASSERT (dynobj != NULL);
2688
2689 if (elf_hash_table (info)->dynamic_sections_created)
2690 {
2691 /* Set the contents of the .interp section to the interpreter. */
2692 if (!info->shared)
2693 {
2694 s = bfd_get_section_by_name (dynobj, ".interp");
2695 BFD_ASSERT (s != NULL);
2696 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
2697 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2698 }
2699 }
2700 else
2701 {
2702 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */
2703 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2704 elf_cris_adjust_gotplt_to_got,
2705 (PTR) info);
2706
2707 /* We may have created entries in the .rela.got section.
2708 However, if we are not creating the dynamic sections, we will
2709 not actually use these entries. Reset the size of .rela.got,
2710 which will cause it to get stripped from the output file
2711 below. */
2712 s = bfd_get_section_by_name (dynobj, ".rela.got");
2713 if (s != NULL)
2714 s->_raw_size = 0;
2715 }
2716
2717 /* If this is a -Bsymbolic shared link, then we need to discard all PC
2718 relative relocs against symbols defined in a regular object. We
2719 allocated space for them in the check_relocs routine, but we will not
2720 fill them in in the relocate_section routine. We also discard space
2721 for relocs that have become for local symbols due to symbol
2722 visibility changes. For programs, we discard space for relocs for
2723 symbols not referenced by any dynamic object. */
2724 if (info->shared)
2725 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2726 elf_cris_discard_excess_dso_dynamics,
2727 (PTR) info);
2728 else
2729 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2730 elf_cris_discard_excess_program_dynamics,
2731 (PTR) info);
2732
2733 /* The check_relocs and adjust_dynamic_symbol entry points have
2734 determined the sizes of the various dynamic sections. Allocate
2735 memory for them. */
2736 plt = false;
2737 relocs = false;
2738 for (s = dynobj->sections; s != NULL; s = s->next)
2739 {
2740 const char *name;
2741 boolean strip;
2742
2743 if ((s->flags & SEC_LINKER_CREATED) == 0)
2744 continue;
2745
2746 /* It's OK to base decisions on the section name, because none
2747 of the dynobj section names depend upon the input files. */
2748 name = bfd_get_section_name (dynobj, s);
2749
2750 strip = false;
2751
2752 if (strcmp (name, ".plt") == 0)
2753 {
2754 if (s->_raw_size == 0)
2755 {
2756 /* Strip this section if we don't need it; see the
2757 comment below. */
2758 strip = true;
2759 }
2760 else
2761 {
2762 /* Remember whether there is a PLT. */
2763 plt = true;
2764 }
2765 }
2766 else if (strncmp (name, ".rela", 5) == 0)
2767 {
2768 if (s->_raw_size == 0)
2769 {
2770 /* If we don't need this section, strip it from the
2771 output file. This is mostly to handle .rela.bss and
2772 .rela.plt. We must create both sections in
2773 create_dynamic_sections, because they must be created
2774 before the linker maps input sections to output
2775 sections. The linker does that before
2776 adjust_dynamic_symbol is called, and it is that
2777 function which decides whether anything needs to go
2778 into these sections. */
2779 strip = true;
2780 }
2781 else
2782 {
2783 /* Remember whether there are any reloc sections other
2784 than .rela.plt. */
2785 if (strcmp (name, ".rela.plt") != 0)
2786 relocs = true;
2787
2788 /* We use the reloc_count field as a counter if we need
2789 to copy relocs into the output file. */
2790 s->reloc_count = 0;
2791 }
2792 }
2793 else if (strncmp (name, ".got", 4) != 0)
2794 {
2795 /* It's not one of our sections, so don't allocate space. */
2796 continue;
2797 }
2798
2799 if (strip)
2800 {
2801 _bfd_strip_section_from_output (info, s);
2802 continue;
2803 }
2804
2805 /* Allocate memory for the section contents. We use bfd_zalloc here
2806 in case unused entries are not reclaimed before the section's
2807 contents are written out. This should not happen, but this way
2808 if it does, we will not write out garbage. For reloc sections,
2809 this will make entries have the type R_CRIS_NONE. */
2810 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
2811 if (s->contents == NULL && s->_raw_size != 0)
2812 return false;
2813 }
2814
2815 if (elf_hash_table (info)->dynamic_sections_created)
2816 {
2817 /* Add some entries to the .dynamic section. We fill in the
2818 values later, in elf_cris_finish_dynamic_sections, but we
2819 must add the entries now so that we get the correct size for
2820 the .dynamic section. The DT_DEBUG entry is filled in by the
2821 dynamic linker and used by the debugger. */
2822 #define add_dynamic_entry(TAG, VAL) \
2823 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
2824
2825 if (!info->shared)
2826 {
2827 if (!add_dynamic_entry (DT_DEBUG, 0))
2828 return false;
2829 }
2830
2831 if (plt)
2832 {
2833 if (!add_dynamic_entry (DT_PLTGOT, 0)
2834 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2835 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2836 || !add_dynamic_entry (DT_JMPREL, 0))
2837 return false;
2838 }
2839
2840 if (relocs)
2841 {
2842 if (!add_dynamic_entry (DT_RELA, 0)
2843 || !add_dynamic_entry (DT_RELASZ, 0)
2844 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2845 return false;
2846 }
2847
2848 if ((info->flags & DF_TEXTREL) != 0)
2849 {
2850 if (!add_dynamic_entry (DT_TEXTREL, 0))
2851 return false;
2852 info->flags |= DF_TEXTREL;
2853 }
2854 }
2855 #undef add_dynamic_entry
2856
2857 return true;
2858 }
2859
2860 /* This function is called via elf_cris_link_hash_traverse if we are
2861 creating a shared object. In the -Bsymbolic case, it discards the
2862 space allocated to copy PC relative relocs against symbols which
2863 are defined in regular objects. For the normal non-symbolic case,
2864 we also discard space for relocs that have become local due to
2865 symbol visibility changes. We allocated space for them in the
2866 check_relocs routine, but we won't fill them in in the
2867 relocate_section routine. */
2868
2869 static boolean
2870 elf_cris_discard_excess_dso_dynamics (h, inf)
2871 struct elf_cris_link_hash_entry *h;
2872 PTR inf;
2873 {
2874 struct elf_cris_pcrel_relocs_copied *s;
2875 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2876
2877 /* If a symbol has been forced local or we have found a regular
2878 definition for the symbolic link case, then we won't be needing
2879 any relocs. */
2880 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
2881 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
2882 || info->symbolic))
2883 {
2884 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
2885 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
2886 }
2887
2888 return true;
2889 }
2890
2891 /* This function is called via elf_cris_link_hash_traverse if we are *not*
2892 creating a shared object. We discard space for relocs for symbols put
2893 in the .got, but which we found we do not have to resolve at run-time. */
2894
2895 static boolean
2896 elf_cris_discard_excess_program_dynamics (h, inf)
2897 struct elf_cris_link_hash_entry *h;
2898 PTR inf;
2899 {
2900 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2901
2902 /* If we're not creating a shared library and have a symbol which is
2903 referred to by .got references, but the symbol is defined locally,
2904 (or rather, not referred to by a DSO and not defined by a DSO) then
2905 lose the reloc for the .got (don't allocate room for it). */
2906 if ((h->root.elf_link_hash_flags
2907 & (ELF_LINK_HASH_REF_DYNAMIC | ELF_LINK_HASH_DEF_DYNAMIC)) == 0)
2908 {
2909 if (h->root.got.refcount > 0
2910 /* The size of this section is only valid and in sync with the
2911 various reference counts if we do dynamic; don't decrement it
2912 otherwise. */
2913 && elf_hash_table (info)->dynamic_sections_created)
2914 {
2915 bfd *dynobj = elf_hash_table (info)->dynobj;
2916 asection *srelgot;
2917
2918 BFD_ASSERT (dynobj != NULL);
2919
2920 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2921
2922 BFD_ASSERT (srelgot != NULL);
2923
2924 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
2925 }
2926
2927 /* If the locally-defined symbol isn't used by a DSO, then we don't
2928 have to export it as a dynamic symbol. This was already done for
2929 functions; doing this for all symbols would presumably not
2930 introduce new problems. */
2931 h->root.dynindx = -1;
2932 }
2933
2934 return true;
2935 }
2936
2937 /* Reject a file depending on presence and expectation of prefixed
2938 underscores on symbols. */
2939
2940 static boolean
2941 cris_elf_object_p (abfd)
2942 bfd *abfd;
2943 {
2944 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE))
2945 return (bfd_get_symbol_leading_char (abfd) == '_');
2946 else
2947 return (bfd_get_symbol_leading_char (abfd) == 0);
2948 }
2949
2950 /* Mark presence or absence of leading underscore. */
2951
2952 static void
2953 cris_elf_final_write_processing (abfd, linker)
2954 bfd *abfd;
2955 boolean linker ATTRIBUTE_UNUSED;
2956 {
2957 if (bfd_get_symbol_leading_char (abfd) == '_')
2958 elf_elfheader (abfd)->e_flags |= EF_CRIS_UNDERSCORE;
2959 else
2960 elf_elfheader (abfd)->e_flags &= ~EF_CRIS_UNDERSCORE;
2961 }
2962
2963 /* Display the flags field. */
2964
2965 static boolean
2966 cris_elf_print_private_bfd_data (abfd, ptr)
2967 bfd *abfd;
2968 PTR ptr;
2969 {
2970 FILE *file = (FILE *) ptr;
2971
2972 BFD_ASSERT (abfd != NULL && ptr != NULL)
2973
2974 _bfd_elf_print_private_bfd_data (abfd, ptr);
2975
2976 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
2977
2978 if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)
2979 fprintf (file, _(" [symbols have a _ prefix]"));
2980
2981 fputc ('\n', file);
2982 return true;
2983 }
2984
2985 /* Don't mix files with and without a leading underscore. */
2986
2987 static boolean
2988 cris_elf_merge_private_bfd_data (ibfd, obfd)
2989 bfd *ibfd;
2990 bfd *obfd;
2991 {
2992 flagword old_flags, new_flags;
2993
2994 if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
2995 return false;
2996
2997 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2998 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2999 return true;
3000
3001 if (! elf_flags_init (obfd))
3002 {
3003 /* This happens when ld starts out with a 'blank' output file. */
3004 elf_flags_init (obfd) = true;
3005
3006 /* Set flags according to current bfd_target. */
3007 cris_elf_final_write_processing (obfd, false);
3008 }
3009
3010 old_flags = elf_elfheader (obfd)->e_flags;
3011 new_flags = elf_elfheader (ibfd)->e_flags;
3012
3013 /* Is this good or bad? We'll follow with other excluding flags. */
3014 if ((old_flags & EF_CRIS_UNDERSCORE) != (new_flags & EF_CRIS_UNDERSCORE))
3015 {
3016 (*_bfd_error_handler)
3017 ((new_flags & EF_CRIS_UNDERSCORE)
3018 ? _("%s: uses _-prefixed symbols, but writing file with non-prefixed symbols")
3019 : _("%s: uses non-prefixed symbols, but writing file with _-prefixed symbols"),
3020 bfd_archive_filename (ibfd));
3021 bfd_set_error (bfd_error_bad_value);
3022 return false;
3023 }
3024
3025 return true;
3026 }
3027
3028
3029 static enum elf_reloc_type_class
3030 elf_cris_reloc_type_class (rela)
3031 const Elf_Internal_Rela *rela;
3032 {
3033 switch ((int) ELF32_R_TYPE (rela->r_info))
3034 {
3035 case R_CRIS_RELATIVE:
3036 return reloc_class_relative;
3037 case R_CRIS_JUMP_SLOT:
3038 return reloc_class_plt;
3039 case R_CRIS_COPY:
3040 return reloc_class_copy;
3041 default:
3042 return reloc_class_normal;
3043 }
3044 }
3045 \f
3046 #define ELF_ARCH bfd_arch_cris
3047 #define ELF_MACHINE_CODE EM_CRIS
3048 #define ELF_MAXPAGESIZE 0x2000
3049
3050 #define TARGET_LITTLE_SYM bfd_elf32_cris_vec
3051 #define TARGET_LITTLE_NAME "elf32-cris"
3052 #define elf_symbol_leading_char 0
3053
3054 #define elf_info_to_howto_rel NULL
3055 #define elf_info_to_howto cris_info_to_howto_rela
3056 #define elf_backend_relocate_section cris_elf_relocate_section
3057 #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook
3058 #define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook
3059 #define elf_backend_check_relocs cris_elf_check_relocs
3060 #define elf_backend_grok_prstatus cris_elf_grok_prstatus
3061 #define elf_backend_grok_psinfo cris_elf_grok_psinfo
3062
3063 #define elf_backend_can_gc_sections 1
3064 #define elf_backend_can_refcount 1
3065
3066 #define elf_backend_object_p cris_elf_object_p
3067 #define elf_backend_final_write_processing \
3068 cris_elf_final_write_processing
3069 #define bfd_elf32_bfd_print_private_bfd_data \
3070 cris_elf_print_private_bfd_data
3071 #define bfd_elf32_bfd_merge_private_bfd_data \
3072 cris_elf_merge_private_bfd_data
3073
3074 #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup
3075
3076 #define bfd_elf32_bfd_link_hash_table_create \
3077 elf_cris_link_hash_table_create
3078 #define elf_backend_adjust_dynamic_symbol \
3079 elf_cris_adjust_dynamic_symbol
3080 #define elf_backend_size_dynamic_sections \
3081 elf_cris_size_dynamic_sections
3082 #define elf_backend_finish_dynamic_symbol \
3083 elf_cris_finish_dynamic_symbol
3084 #define elf_backend_finish_dynamic_sections \
3085 elf_cris_finish_dynamic_sections
3086 #define elf_backend_create_dynamic_sections \
3087 _bfd_elf_create_dynamic_sections
3088 #define bfd_elf32_bfd_final_link \
3089 _bfd_elf32_gc_common_final_link
3090 #define elf_backend_hide_symbol elf_cris_hide_symbol
3091 #define elf_backend_reloc_type_class elf_cris_reloc_type_class
3092
3093 #define elf_backend_want_got_plt 1
3094 #define elf_backend_plt_readonly 1
3095 #define elf_backend_want_plt_sym 0
3096 #define elf_backend_got_header_size 12
3097 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
3098
3099 /* Later, we my want to optimize RELA entries into REL entries for dynamic
3100 linking and libraries (if it's a win of any significance). Until then,
3101 take the easy route. */
3102 #define elf_backend_may_use_rel_p 0
3103 #define elf_backend_may_use_rela_p 1
3104
3105 #include "elf32-target.h"
3106
3107 #define INCLUDED_TARGET_FILE
3108
3109 #undef TARGET_LITTLE_SYM
3110 #undef TARGET_LITTLE_NAME
3111 #undef elf_symbol_leading_char
3112
3113 #define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec
3114 #define TARGET_LITTLE_NAME "elf32-us-cris"
3115 #define elf_symbol_leading_char '_'
3116
3117 #include "elf32-target.h"
GDB Binutils - Deliverables
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