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Patch from Steve Ellcey for ia64-hpux.
[binutils.git] / bfd / elf32-cris.c
blobe2a51f64181f058cf8d102628d0cc239bfa5bbe5
1 /* CRIS-specific support for 32-bit ELF.
2 Copyright 2000, 2001, 2002, 2003 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 *, Elf_Internal_Rela *));
35
36 static bfd_boolean cris_elf_grok_prstatus
37 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
38
39 static bfd_boolean cris_elf_grok_psinfo
40 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
41
42 static bfd_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 bfd_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 ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
56 struct elf_link_hash_entry *, Elf_Internal_Sym *));
57
58 static bfd_boolean cris_elf_object_p PARAMS ((bfd *));
59
60 static void cris_elf_final_write_processing PARAMS ((bfd *, bfd_boolean));
61
62 static bfd_boolean cris_elf_print_private_bfd_data PARAMS ((bfd *, PTR));
63
64 static bfd_boolean cris_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
65
66 struct elf_cris_link_hash_entry;
67 static bfd_boolean elf_cris_discard_excess_dso_dynamics
68 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
69 static bfd_boolean elf_cris_discard_excess_program_dynamics
70 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
71 static bfd_boolean elf_cris_adjust_gotplt_to_got
72 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
73 static bfd_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 bfd_boolean elf_cris_adjust_dynamic_symbol
80 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
81 static bfd_boolean cris_elf_check_relocs
82 PARAMS ((bfd *, struct bfd_link_info *, asection *,
83 const Elf_Internal_Rela *));
84
85 static bfd_boolean elf_cris_size_dynamic_sections
86 PARAMS ((bfd *, struct bfd_link_info *));
87 static bfd_boolean elf_cris_finish_dynamic_symbol
88 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
89 Elf_Internal_Sym *));
90 static bfd_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 *, bfd_boolean));
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_PCREL", /* 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_PCREL", /* 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 Elf_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 bfd_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 bfd_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 (bfd_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_malloc (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 free (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 bfd_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 if (info->relocatable)
803 return TRUE;
804
805 dynobj = elf_hash_table (info)->dynobj;
806 local_got_offsets = elf_local_got_offsets (input_bfd);
807 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
808 sym_hashes = elf_sym_hashes (input_bfd);
809 relend = relocs + input_section->reloc_count;
810
811 sgot = NULL;
812 splt = NULL;
813 sreloc = NULL;
814
815 if (dynobj != NULL)
816 {
817 splt = bfd_get_section_by_name (dynobj, ".plt");
818 sgot = bfd_get_section_by_name (dynobj, ".got");
819 }
820
821 for (rel = relocs; rel < relend; rel ++)
822 {
823 reloc_howto_type *howto;
824 unsigned long r_symndx;
825 Elf_Internal_Sym *sym;
826 asection *sec;
827 struct elf_link_hash_entry *h;
828 bfd_vma relocation;
829 bfd_reloc_status_type r;
830 const char *symname = NULL;
831 int r_type;
832
833 r_type = ELF32_R_TYPE (rel->r_info);
834
835 if ( r_type == R_CRIS_GNU_VTINHERIT
836 || r_type == R_CRIS_GNU_VTENTRY)
837 continue;
838
839 /* This is a final link. */
840 r_symndx = ELF32_R_SYM (rel->r_info);
841 howto = cris_elf_howto_table + r_type;
842 h = NULL;
843 sym = NULL;
844 sec = NULL;
845
846 if (r_symndx < symtab_hdr->sh_info)
847 {
848 sym = local_syms + r_symndx;
849 sec = local_sections [r_symndx];
850 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
851
852 symname = (bfd_elf_string_from_elf_section
853 (input_bfd, symtab_hdr->sh_link, sym->st_name));
854 if (symname == NULL)
855 symname = bfd_section_name (input_bfd, sec);
856 }
857 else
858 {
859 bfd_boolean warned;
860 bfd_boolean unresolved_reloc;
861
862 RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx, symtab_hdr, relocation, sec, unresolved_reloc, info, warned);
863
864 if (unresolved_reloc
865 /* Perhaps we should detect the cases that
866 sec->output_section is expected to be NULL like i386 and
867 m68k, but apparently (and according to elfxx-ia64.c) all
868 valid cases are where the symbol is defined in a shared
869 object which we link dynamically against. This includes
870 PLT relocs for which we've created a PLT entry and other
871 relocs for which we're prepared to create dynamic
872 relocations.
873
874 For now, new situations cause us to just err when
875 sec->output_offset is NULL but the object with the symbol
876 is *not* dynamically linked against. Thus this will
877 automatically remind us so we can see if there are other
878 valid cases we need to revisit. */
879 && (sec->owner->flags & DYNAMIC) != 0)
880 relocation = 0;
881
882 else if (h->root.type == bfd_link_hash_defined
883 || h->root.type == bfd_link_hash_defweak)
884 {
885 /* Here follow the cases where the relocation value must
886 be zero (or when further handling is simplified when
887 zero). I can't claim to understand the various
888 conditions and they weren't described in the files
889 where I copied them from (elf32-m68k.c and
890 elf32-i386.c), but let's mention examples of where
891 they happen. FIXME: Perhaps define and use a
892 dynamic_symbol_p function like ia64.
893
894 - When creating a shared library, we can have an
895 ordinary relocation for a symbol defined in a shared
896 library (perhaps the one we create). We then make
897 the relocation value zero, as the value seen now will
898 be added into the relocation addend in this shared
899 library, but must be handled only at dynamic-link
900 time. FIXME: Not sure this example covers the
901 h->elf_link_hash_flags test, though it's there in
902 other targets. */
903 if (info->shared
904 && ((! info->symbolic && h->dynindx != -1)
905 || (h->elf_link_hash_flags
906 & ELF_LINK_HASH_DEF_REGULAR) == 0)
907 && (input_section->flags & SEC_ALLOC) != 0
908 && (r_type == R_CRIS_8
909 || r_type == R_CRIS_16
910 || r_type == R_CRIS_32
911 || r_type == R_CRIS_8_PCREL
912 || r_type == R_CRIS_16_PCREL
913 || r_type == R_CRIS_32_PCREL))
914 relocation = 0;
915 else if (unresolved_reloc)
916 {
917 _bfd_error_handler
918 (_("%s: unresolvable relocation %s against symbol `%s' from %s section"),
919 bfd_archive_filename (input_bfd),
920 cris_elf_howto_table[r_type].name,
921 symname,
922 bfd_get_section_name (input_bfd, input_section));
923 bfd_set_error (bfd_error_bad_value);
924 return FALSE;
925 }
926 }
927 }
928
929 switch (r_type)
930 {
931 case R_CRIS_16_GOTPLT:
932 case R_CRIS_32_GOTPLT:
933 /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT,
934 but we require a PLT, and the PLT handling will take care of
935 filling in the PLT-specific GOT entry. For the GOT offset,
936 calculate it as we do when filling it in for the .got.plt
937 section. If we don't have a PLT, punt to GOT handling. */
938 if (h != NULL
939 && ((struct elf_cris_link_hash_entry *) h)->gotplt_offset != 0)
940 {
941 asection *sgotplt
942 = bfd_get_section_by_name (dynobj, ".got.plt");
943 bfd_vma got_offset;
944
945 BFD_ASSERT (h->dynindx != -1);
946 BFD_ASSERT (sgotplt != NULL);
947
948 got_offset
949 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset;
950
951 relocation = got_offset;
952 break;
953 }
954
955 /* We didn't make a PLT entry for this symbol. Maybe everything is
956 folded into the GOT. Other than folding, this happens when
957 statically linking PIC code, or when using -Bsymbolic. Check
958 that we instead have a GOT entry as done for us by
959 elf_cris_adjust_dynamic_symbol, and drop through into the
960 ordinary GOT cases. */
961 if (h != NULL && h->got.offset == (bfd_vma) -1)
962 {
963 (*_bfd_error_handler)
964 (_("%s: No PLT nor GOT for relocation %s against symbol `%s' from %s section"),
965 bfd_archive_filename (input_bfd),
966 cris_elf_howto_table[r_type].name,
967 symname[0] != '\0' ? symname : _("[whose name is lost]"),
968 bfd_get_section_name (input_bfd, input_section));
969
970 /* FIXME: Perhaps blaming input is not the right thing to
971 do; this is probably an internal error. But it is true
972 that we didn't like that particular input. */
973 bfd_set_error (bfd_error_bad_value);
974 return FALSE;
975 }
976 /* Fall through. */
977
978 /* The size of the actual relocation is not used here; we only
979 fill in the GOT table here. */
980 case R_CRIS_16_GOT:
981 case R_CRIS_32_GOT:
982 {
983 bfd_vma off;
984
985 /* Note that despite using RELA relocations, the .got contents
986 is always filled in with the link-relative relocation
987 value; the addend. */
988
989 if (h != NULL)
990 {
991 off = h->got.offset;
992 BFD_ASSERT (off != (bfd_vma) -1);
993
994 if (!elf_hash_table (info)->dynamic_sections_created
995 || (! info->shared
996 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
997 || (info->shared
998 && (info->symbolic || h->dynindx == -1)
999 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1000 {
1001 /* This wasn't checked above for ! info->shared, but
1002 must hold there if we get here; the symbol must be
1003 defined in the regular program, or be undefweak. */
1004 BFD_ASSERT (!elf_hash_table (info)->dynamic_sections_created
1005 || info->shared
1006 || (h->elf_link_hash_flags
1007 & ELF_LINK_HASH_DEF_REGULAR) != 0
1008 || h->root.type == bfd_link_hash_undefweak);
1009
1010 /* This is actually a static link, or it is a
1011 -Bsymbolic link and the symbol is defined locally,
1012 or is undefweak, or the symbol was forced to be
1013 local because of a version file, or we're not
1014 creating a dynamic object. We must initialize this
1015 entry in the global offset table. Since the offset
1016 must always be a multiple of 4, we use the least
1017 significant bit to record whether we have
1018 initialized it already.
1019
1020 If this GOT entry should be runtime-initialized, we
1021 will create a .rela.got relocation entry to
1022 initialize the value. This is done in the
1023 finish_dynamic_symbol routine. */
1024 if ((off & 1) != 0)
1025 off &= ~1;
1026 else
1027 {
1028 bfd_put_32 (output_bfd, relocation,
1029 sgot->contents + off);
1030 h->got.offset |= 1;
1031 }
1032 }
1033 }
1034 else
1035 {
1036 BFD_ASSERT (local_got_offsets != NULL
1037 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1038
1039 off = local_got_offsets[r_symndx];
1040
1041 /* The offset must always be a multiple of 4. We use
1042 the least significant bit to record whether we have
1043 already generated the necessary reloc. */
1044 if ((off & 1) != 0)
1045 off &= ~1;
1046 else
1047 {
1048 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1049
1050 if (info->shared)
1051 {
1052 asection *s;
1053 Elf_Internal_Rela outrel;
1054 bfd_byte *loc;
1055
1056 s = bfd_get_section_by_name (dynobj, ".rela.got");
1057 BFD_ASSERT (s != NULL);
1058
1059 outrel.r_offset = (sgot->output_section->vma
1060 + sgot->output_offset
1061 + off);
1062 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1063 outrel.r_addend = relocation;
1064 loc = s->contents;
1065 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1066 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1067 }
1068
1069 local_got_offsets[r_symndx] |= 1;
1070 }
1071 }
1072
1073 relocation = sgot->output_offset + off;
1074 if (rel->r_addend != 0)
1075 {
1076 /* We can't do anything for a relocation which is against
1077 a symbol *plus offset*. GOT holds relocations for
1078 symbols. Make this an error; the compiler isn't
1079 allowed to pass us these kinds of things. */
1080 if (h == NULL)
1081 (*_bfd_error_handler)
1082 (_("%s: relocation %s with non-zero addend %d against local symbol from %s section"),
1083 bfd_archive_filename (input_bfd),
1084 cris_elf_howto_table[r_type].name,
1085 rel->r_addend,
1086 bfd_get_section_name (input_bfd, input_section));
1087 else
1088 (*_bfd_error_handler)
1089 (_("%s: relocation %s with non-zero addend %d against symbol `%s' from %s section"),
1090 bfd_archive_filename (input_bfd),
1091 cris_elf_howto_table[r_type].name,
1092 rel->r_addend,
1093 symname[0] != '\0' ? symname : _("[whose name is lost]"),
1094 bfd_get_section_name (input_bfd, input_section));
1095
1096 bfd_set_error (bfd_error_bad_value);
1097 return FALSE;
1098 }
1099 }
1100 break;
1101
1102 case R_CRIS_32_GOTREL:
1103 /* This relocation must only be performed against local symbols.
1104 It's also ok when we link a program and the symbol is either
1105 defined in an ordinary (non-DSO) object or is undefined weak. */
1106 if (h != NULL
1107 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1108 && !(!info->shared
1109 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1110 || ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
1111 && h->root.type == bfd_link_hash_undefweak))))
1112 {
1113 (*_bfd_error_handler)
1114 (_("%s: relocation %s is not allowed for global symbol: `%s' from %s section"),
1115 bfd_archive_filename (input_bfd),
1116 cris_elf_howto_table[r_type].name,
1117 symname,
1118 bfd_get_section_name (input_bfd, input_section));
1119 bfd_set_error (bfd_error_bad_value);
1120 return FALSE;
1121 }
1122
1123 /* This can happen if we get a link error with the input ELF
1124 variant mismatching the output variant. Emit an error so
1125 it's noticed if it happens elsewhere. */
1126 if (sgot == NULL)
1127 {
1128 (*_bfd_error_handler)
1129 (_("%s: relocation %s in section %s with no GOT created"),
1130 bfd_archive_filename (input_bfd),
1131 cris_elf_howto_table[r_type].name,
1132 bfd_get_section_name (input_bfd, input_section));
1133 bfd_set_error (bfd_error_bad_value);
1134 return FALSE;
1135 }
1136
1137 /* This relocation is like a PC-relative one, except the
1138 reference point is the location of GOT. Note that
1139 sgot->output_offset is not involved in this calculation. We
1140 always want the start of entire .got section, not the
1141 position after the reserved header. */
1142 relocation -= sgot->output_section->vma;
1143 break;
1144
1145 case R_CRIS_32_PLT_PCREL:
1146 /* Relocation is to the entry for this symbol in the
1147 procedure linkage table. */
1148
1149 /* Resolve a PLT_PCREL reloc against a local symbol directly,
1150 without using the procedure linkage table. */
1151 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1152 break;
1153
1154 if (h->plt.offset == (bfd_vma) -1
1155 || splt == NULL)
1156 {
1157 /* We didn't make a PLT entry for this symbol. This
1158 happens when statically linking PIC code, or when
1159 using -Bsymbolic. */
1160 break;
1161 }
1162
1163 relocation = (splt->output_section->vma
1164 + splt->output_offset
1165 + h->plt.offset);
1166 break;
1167
1168 case R_CRIS_32_PLT_GOTREL:
1169 /* Like R_CRIS_32_PLT_PCREL, but the reference point is the
1170 start of the .got section. See also comment at
1171 R_CRIS_32_GOT. */
1172 relocation -= sgot->output_section->vma;
1173
1174 /* Resolve a PLT_GOTREL reloc against a local symbol directly,
1175 without using the procedure linkage table. */
1176 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1177 break;
1178
1179 if (h->plt.offset == (bfd_vma) -1
1180 || splt == NULL)
1181 {
1182 /* We didn't make a PLT entry for this symbol. This
1183 happens when statically linking PIC code, or when
1184 using -Bsymbolic. */
1185 break;
1186 }
1187
1188 relocation = (splt->output_section->vma
1189 + splt->output_offset
1190 + h->plt.offset
1191 - sgot->output_section->vma);
1192 break;
1193
1194 case R_CRIS_8_PCREL:
1195 case R_CRIS_16_PCREL:
1196 case R_CRIS_32_PCREL:
1197 /* If the symbol was local, we need no shlib-specific handling. */
1198 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1199 break;
1200
1201 /* Fall through. */
1202 case R_CRIS_8:
1203 case R_CRIS_16:
1204 case R_CRIS_32:
1205 if (info->shared
1206 && r_symndx != 0
1207 && (input_section->flags & SEC_ALLOC) != 0
1208 && ((r_type != R_CRIS_8_PCREL
1209 && r_type != R_CRIS_16_PCREL
1210 && r_type != R_CRIS_32_PCREL)
1211 || (!info->symbolic
1212 || (h->elf_link_hash_flags
1213 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1214 {
1215 Elf_Internal_Rela outrel;
1216 bfd_byte *loc;
1217 bfd_boolean skip, relocate;
1218
1219 /* When generating a shared object, these relocations
1220 are copied into the output file to be resolved at run
1221 time. */
1222
1223 if (sreloc == NULL)
1224 {
1225 const char *name;
1226
1227 name = (bfd_elf_string_from_elf_section
1228 (input_bfd,
1229 elf_elfheader (input_bfd)->e_shstrndx,
1230 elf_section_data (input_section)->rel_hdr.sh_name));
1231 if (name == NULL)
1232 return FALSE;
1233
1234 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1235 && strcmp (bfd_get_section_name (input_bfd,
1236 input_section),
1237 name + 5) == 0);
1238
1239 sreloc = bfd_get_section_by_name (dynobj, name);
1240
1241 /* That section should have been created in
1242 cris_elf_check_relocs, but that function will not be
1243 called for objects which fail in
1244 cris_elf_merge_private_bfd_data. */
1245 if (sreloc == NULL)
1246 {
1247 (*_bfd_error_handler)
1248 (_("%s: Internal inconsistency; no relocation section %s"),
1249 bfd_archive_filename (input_bfd),
1250 name);
1251
1252 bfd_set_error (bfd_error_bad_value);
1253 return FALSE;
1254 }
1255 }
1256
1257 skip = FALSE;
1258 relocate = FALSE;
1259
1260 outrel.r_offset =
1261 _bfd_elf_section_offset (output_bfd, info, input_section,
1262 rel->r_offset);
1263 if (outrel.r_offset == (bfd_vma) -1)
1264 skip = TRUE;
1265 else if (outrel.r_offset == (bfd_vma) -2)
1266 skip = TRUE, relocate = TRUE;
1267 outrel.r_offset += (input_section->output_section->vma
1268 + input_section->output_offset);
1269
1270 if (skip)
1271 memset (&outrel, 0, sizeof outrel);
1272 /* h->dynindx may be -1 if the symbol was marked to
1273 become local. */
1274 else if (h != NULL
1275 && ((! info->symbolic && h->dynindx != -1)
1276 || (h->elf_link_hash_flags
1277 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1278 {
1279 BFD_ASSERT (h->dynindx != -1);
1280 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1281 outrel.r_addend = relocation + rel->r_addend;
1282 }
1283 else
1284 {
1285 if (r_type == R_CRIS_32)
1286 {
1287 relocate = TRUE;
1288 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1289 outrel.r_addend = relocation + rel->r_addend;
1290 }
1291 else
1292 {
1293 long indx;
1294
1295 if (bfd_is_abs_section (sec))
1296 indx = 0;
1297 else if (sec == NULL || sec->owner == NULL)
1298 {
1299 bfd_set_error (bfd_error_bad_value);
1300 return FALSE;
1301 }
1302 else
1303 {
1304 asection *osec;
1305
1306 osec = sec->output_section;
1307 indx = elf_section_data (osec)->dynindx;
1308 BFD_ASSERT (indx > 0);
1309 }
1310
1311 outrel.r_info = ELF32_R_INFO (indx, r_type);
1312 outrel.r_addend = relocation + rel->r_addend;
1313 }
1314 }
1315
1316 loc = sreloc->contents;
1317 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1318 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1319
1320 /* This reloc will be computed at runtime, so there's no
1321 need to do anything now, except for R_CRIS_32 relocations
1322 that have been turned into R_CRIS_RELATIVE. */
1323 if (!relocate)
1324 continue;
1325 }
1326
1327 break;
1328 }
1329
1330 r = cris_final_link_relocate (howto, input_bfd, input_section,
1331 contents, rel, relocation);
1332
1333 if (r != bfd_reloc_ok)
1334 {
1335 const char * msg = (const char *) NULL;
1336
1337 switch (r)
1338 {
1339 case bfd_reloc_overflow:
1340 r = info->callbacks->reloc_overflow
1341 (info, symname, howto->name, (bfd_vma) 0,
1342 input_bfd, input_section, rel->r_offset);
1343 break;
1344
1345 case bfd_reloc_undefined:
1346 r = info->callbacks->undefined_symbol
1347 (info, symname, input_bfd, input_section, rel->r_offset,
1348 TRUE);
1349 break;
1350
1351 case bfd_reloc_outofrange:
1352 msg = _("internal error: out of range error");
1353 break;
1354
1355 case bfd_reloc_notsupported:
1356 msg = _("internal error: unsupported relocation error");
1357 break;
1358
1359 case bfd_reloc_dangerous:
1360 msg = _("internal error: dangerous relocation");
1361 break;
1362
1363 default:
1364 msg = _("internal error: unknown error");
1365 break;
1366 }
1367
1368 if (msg)
1369 r = info->callbacks->warning
1370 (info, msg, symname, input_bfd, input_section, rel->r_offset);
1371
1372 if (! r)
1373 return FALSE;
1374 }
1375 }
1376
1377 return TRUE;
1378 }
1379 \f
1380 /* Finish up dynamic symbol handling. We set the contents of various
1381 dynamic sections here. */
1382
1383 static bfd_boolean
1384 elf_cris_finish_dynamic_symbol (output_bfd, info, h, sym)
1385 bfd *output_bfd;
1386 struct bfd_link_info *info;
1387 struct elf_link_hash_entry *h;
1388 Elf_Internal_Sym *sym;
1389 {
1390 bfd *dynobj;
1391 int plt_off1 = 2, plt_off2 = 10, plt_off3 = 16;
1392
1393 dynobj = elf_hash_table (info)->dynobj;
1394
1395 if (h->plt.offset != (bfd_vma) -1)
1396 {
1397 asection *splt;
1398 asection *sgotplt;
1399 asection *sgot;
1400 asection *srela;
1401 bfd_vma got_base;
1402
1403 bfd_vma gotplt_offset
1404 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset;
1405 Elf_Internal_Rela rela;
1406 bfd_byte *loc;
1407 bfd_boolean has_gotplt = gotplt_offset != 0;
1408
1409 /* Get the index in the procedure linkage table which
1410 corresponds to this symbol. This is the index of this symbol
1411 in all the symbols for which we are making plt entries. The
1412 first entry in the procedure linkage table is reserved. */
1413 /* We have to count backwards here, and the result is only valid as
1414 an index into .got.plt and its relocations. FIXME: Constants... */
1415 bfd_vma gotplt_index = gotplt_offset/4 - 3;
1416
1417 /* Get the offset into the .got table of the entry that corresponds
1418 to this function. Note that we embed knowledge that "incoming"
1419 .got goes after .got.plt in the output without padding (pointer
1420 aligned). However, that knowledge is present in several other
1421 places too, here and in elflink.h at least. */
1422 bfd_vma got_offset
1423 = (has_gotplt
1424 ? gotplt_offset
1425 : h->got.offset + elf_cris_hash_table(info)->next_gotplt_entry);
1426
1427 /* This symbol has an entry in the procedure linkage table. Set it
1428 up. */
1429
1430 BFD_ASSERT (h->dynindx != -1);
1431
1432 splt = bfd_get_section_by_name (dynobj, ".plt");
1433 sgot = bfd_get_section_by_name (dynobj, ".got");
1434 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1435 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1436 BFD_ASSERT (splt != NULL && sgotplt != NULL
1437 && (! has_gotplt || srela != NULL));
1438
1439 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1440
1441 /* Fill in the entry in the procedure linkage table. */
1442 if (! info->shared)
1443 {
1444 memcpy (splt->contents + h->plt.offset, elf_cris_plt_entry,
1445 PLT_ENTRY_SIZE);
1446
1447 /* We need to enter the absolute address of the GOT entry here. */
1448 bfd_put_32 (output_bfd, got_base + got_offset,
1449 splt->contents + h->plt.offset + plt_off1);
1450 }
1451 else
1452 {
1453 memcpy (splt->contents + h->plt.offset, elf_cris_pic_plt_entry,
1454 PLT_ENTRY_SIZE);
1455 bfd_put_32 (output_bfd, got_offset,
1456 splt->contents + h->plt.offset + plt_off1);
1457 }
1458
1459 /* Fill in the plt entry and make a relocation, if this is a "real"
1460 PLT entry. */
1461 if (has_gotplt)
1462 {
1463 /* Fill in the offset into the reloc table. */
1464 bfd_put_32 (output_bfd,
1465 gotplt_index * sizeof (Elf32_External_Rela),
1466 splt->contents + h->plt.offset + plt_off2);
1467
1468 /* Fill in the offset to the first PLT entry, where to "jump". */
1469 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3 + 4),
1470 splt->contents + h->plt.offset + plt_off3);
1471
1472 /* Fill in the entry in the global offset table with the address of
1473 the relocating stub. */
1474 bfd_put_32 (output_bfd,
1475 (splt->output_section->vma
1476 + splt->output_offset
1477 + h->plt.offset
1478 + 8),
1479 sgotplt->contents + got_offset);
1480
1481 /* Fill in the entry in the .rela.plt section. */
1482 rela.r_offset = (sgotplt->output_section->vma
1483 + sgotplt->output_offset
1484 + got_offset);
1485 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_JUMP_SLOT);
1486 rela.r_addend = 0;
1487 loc = srela->contents + gotplt_index * sizeof (Elf32_External_Rela);
1488 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1489 }
1490
1491 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1492 {
1493 /* Mark the symbol as undefined, rather than as defined in
1494 the .plt section. Leave the value alone. */
1495 sym->st_shndx = SHN_UNDEF;
1496
1497 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't
1498 know whether resetting the value is significant; if it really
1499 is, rather than a quirk or bug in the sparc port, then I
1500 believe we'd see this elsewhere. */
1501 /* If the symbol is weak, we do need to clear the value.
1502 Otherwise, the PLT entry would provide a definition for
1503 the symbol even if the symbol wasn't defined anywhere,
1504 and so the symbol would never be NULL. */
1505 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
1506 == 0)
1507 sym->st_value = 0;
1508 }
1509 }
1510
1511 /* We don't emit .got relocs for symbols that aren't in the
1512 dynamic-symbols table for an ordinary program and are either defined
1513 by the program or are undefined weak symbols. */
1514 if (h->got.offset != (bfd_vma) -1
1515 && (info->shared
1516 || (h->dynindx != -1
1517 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
1518 && h->root.type != bfd_link_hash_undefweak)))
1519 {
1520 asection *sgot;
1521 asection *srela;
1522 Elf_Internal_Rela rela;
1523 bfd_byte *loc;
1524 bfd_byte *where;
1525
1526 /* This symbol has an entry in the global offset table. Set it up. */
1527
1528 sgot = bfd_get_section_by_name (dynobj, ".got");
1529 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1530 BFD_ASSERT (sgot != NULL && srela != NULL);
1531
1532 rela.r_offset = (sgot->output_section->vma
1533 + sgot->output_offset
1534 + (h->got.offset &~ (bfd_vma) 1));
1535
1536 /* If this is a static link, or it is a -Bsymbolic link and the
1537 symbol is defined locally or was forced to be local because
1538 of a version file, we just want to emit a RELATIVE reloc.
1539 The entry in the global offset table will already have been
1540 initialized in the relocate_section function. */
1541 where = sgot->contents + (h->got.offset &~ (bfd_vma) 1);
1542 if (! elf_hash_table (info)->dynamic_sections_created
1543 || (info->shared
1544 && (info->symbolic || h->dynindx == -1)
1545 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1546 {
1547 rela.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1548 rela.r_addend = bfd_get_signed_32 (output_bfd, where);
1549 }
1550 else
1551 {
1552 bfd_put_32 (output_bfd, (bfd_vma) 0, where);
1553 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_GLOB_DAT);
1554 rela.r_addend = 0;
1555 }
1556
1557 loc = srela->contents;
1558 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1559 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1560 }
1561
1562 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1563 {
1564 asection *s;
1565 Elf_Internal_Rela rela;
1566 bfd_byte *loc;
1567
1568 /* This symbol needs a copy reloc. Set it up. */
1569
1570 BFD_ASSERT (h->dynindx != -1
1571 && (h->root.type == bfd_link_hash_defined
1572 || h->root.type == bfd_link_hash_defweak));
1573
1574 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1575 ".rela.bss");
1576 BFD_ASSERT (s != NULL);
1577
1578 rela.r_offset = (h->root.u.def.value
1579 + h->root.u.def.section->output_section->vma
1580 + h->root.u.def.section->output_offset);
1581 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_COPY);
1582 rela.r_addend = 0;
1583 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1584 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1585 }
1586
1587 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1588 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1589 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1590 sym->st_shndx = SHN_ABS;
1591
1592 return TRUE;
1593 }
1594 \f
1595 /* Finish up the dynamic sections. */
1596
1597 static bfd_boolean
1598 elf_cris_finish_dynamic_sections (output_bfd, info)
1599 bfd *output_bfd;
1600 struct bfd_link_info *info;
1601 {
1602 bfd *dynobj;
1603 asection *sgot;
1604 asection *sdyn;
1605
1606 dynobj = elf_hash_table (info)->dynobj;
1607
1608 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1609 BFD_ASSERT (sgot != NULL);
1610 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1611
1612 if (elf_hash_table (info)->dynamic_sections_created)
1613 {
1614 asection *splt;
1615 Elf32_External_Dyn *dyncon, *dynconend;
1616
1617 splt = bfd_get_section_by_name (dynobj, ".plt");
1618 BFD_ASSERT (splt != NULL && sdyn != NULL);
1619
1620 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1621 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1622 for (; dyncon < dynconend; dyncon++)
1623 {
1624 Elf_Internal_Dyn dyn;
1625 asection *s;
1626
1627 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1628
1629 switch (dyn.d_tag)
1630 {
1631 default:
1632 break;
1633
1634 case DT_PLTGOT:
1635 s = bfd_get_section_by_name (output_bfd, ".got");
1636 BFD_ASSERT (s != NULL);
1637 dyn.d_un.d_ptr = s->vma;
1638 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1639 break;
1640
1641 case DT_JMPREL:
1642 /* Yes, we *can* have a .plt and no .plt.rela, for instance
1643 if all symbols are found in the .got (not .got.plt). */
1644 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1645 dyn.d_un.d_ptr = s != NULL ? s->vma : 0;
1646 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1647 break;
1648
1649 case DT_PLTRELSZ:
1650 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1651 if (s == NULL)
1652 dyn.d_un.d_val = 0;
1653 else if (s->_cooked_size != 0)
1654 dyn.d_un.d_val = s->_cooked_size;
1655 else
1656 dyn.d_un.d_val = s->_raw_size;
1657 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1658 break;
1659
1660 case DT_RELASZ:
1661 /* The procedure linkage table relocs (DT_JMPREL) should
1662 not be included in the overall relocs (DT_RELA).
1663 Therefore, we override the DT_RELASZ entry here to
1664 make it not include the JMPREL relocs. Since the
1665 linker script arranges for .rela.plt to follow all
1666 other relocation sections, we don't have to worry
1667 about changing the DT_RELA entry. */
1668 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1669 if (s != NULL)
1670 {
1671 if (s->_cooked_size != 0)
1672 dyn.d_un.d_val -= s->_cooked_size;
1673 else
1674 dyn.d_un.d_val -= s->_raw_size;
1675 }
1676 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1677 break;
1678 }
1679 }
1680
1681 /* Fill in the first entry in the procedure linkage table. */
1682 if (splt->_raw_size > 0)
1683 {
1684 if (info->shared)
1685 memcpy (splt->contents, elf_cris_pic_plt0_entry, PLT_ENTRY_SIZE);
1686 else
1687 {
1688 memcpy (splt->contents, elf_cris_plt0_entry, PLT_ENTRY_SIZE);
1689 bfd_put_32 (output_bfd,
1690 sgot->output_section->vma + sgot->output_offset + 4,
1691 splt->contents + 6);
1692 bfd_put_32 (output_bfd,
1693 sgot->output_section->vma + sgot->output_offset + 8,
1694 splt->contents + 14);
1695
1696 elf_section_data (splt->output_section)->this_hdr.sh_entsize
1697 = PLT_ENTRY_SIZE;
1698 }
1699 }
1700 }
1701
1702 /* Fill in the first three entries in the global offset table. */
1703 if (sgot->_raw_size > 0)
1704 {
1705 if (sdyn == NULL)
1706 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1707 else
1708 bfd_put_32 (output_bfd,
1709 sdyn->output_section->vma + sdyn->output_offset,
1710 sgot->contents);
1711 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
1712 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
1713 }
1714
1715 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1716
1717 return TRUE;
1718 }
1719 \f
1720 /* Return the section that should be marked against GC for a given
1721 relocation. */
1722
1723 static asection *
1724 cris_elf_gc_mark_hook (sec, info, rel, h, sym)
1725 asection *sec;
1726 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1727 Elf_Internal_Rela *rel;
1728 struct elf_link_hash_entry *h;
1729 Elf_Internal_Sym *sym;
1730 {
1731 if (h != NULL)
1732 {
1733 switch (ELF32_R_TYPE (rel->r_info))
1734 {
1735 case R_CRIS_GNU_VTINHERIT:
1736 case R_CRIS_GNU_VTENTRY:
1737 break;
1738
1739 default:
1740 switch (h->root.type)
1741 {
1742 case bfd_link_hash_defined:
1743 case bfd_link_hash_defweak:
1744 return h->root.u.def.section;
1745
1746 case bfd_link_hash_common:
1747 return h->root.u.c.p->section;
1748
1749 default:
1750 break;
1751 }
1752 }
1753 }
1754 else
1755 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1756
1757 return NULL;
1758 }
1759
1760 /* Update the got entry reference counts for the section being removed. */
1761
1762 static bfd_boolean
1763 cris_elf_gc_sweep_hook (abfd, info, sec, relocs)
1764 bfd *abfd ATTRIBUTE_UNUSED;
1765 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1766 asection *sec ATTRIBUTE_UNUSED;
1767 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
1768 {
1769 Elf_Internal_Shdr *symtab_hdr;
1770 struct elf_link_hash_entry **sym_hashes;
1771 bfd_signed_vma *local_got_refcounts;
1772 const Elf_Internal_Rela *rel, *relend;
1773 bfd *dynobj;
1774 asection *sgot;
1775 asection *srelgot;
1776
1777 dynobj = elf_hash_table (info)->dynobj;
1778 if (dynobj == NULL)
1779 return TRUE;
1780
1781 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1782 sym_hashes = elf_sym_hashes (abfd);
1783 local_got_refcounts = elf_local_got_refcounts (abfd);
1784
1785 sgot = bfd_get_section_by_name (dynobj, ".got");
1786 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1787
1788 relend = relocs + sec->reloc_count;
1789 for (rel = relocs; rel < relend; rel++)
1790 {
1791 unsigned long r_symndx;
1792 struct elf_link_hash_entry *h;
1793
1794 switch (ELF32_R_TYPE (rel->r_info))
1795 {
1796 case R_CRIS_16_GOT:
1797 case R_CRIS_32_GOT:
1798 r_symndx = ELF32_R_SYM (rel->r_info);
1799 if (r_symndx >= symtab_hdr->sh_info)
1800 {
1801 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1802 if (h->got.refcount > 0)
1803 {
1804 --h->got.refcount;
1805 if (h->got.refcount == 0)
1806 {
1807 /* We don't need the .got entry any more. */
1808 sgot->_raw_size -= 4;
1809 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
1810 }
1811 }
1812 break;
1813 }
1814
1815 local_got_reloc:
1816 if (local_got_refcounts != NULL)
1817 {
1818 if (local_got_refcounts[r_symndx] > 0)
1819 {
1820 --local_got_refcounts[r_symndx];
1821 if (local_got_refcounts[r_symndx] == 0)
1822 {
1823 /* We don't need the .got entry any more. */
1824 sgot->_raw_size -= 4;
1825 if (info->shared)
1826 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
1827 }
1828 }
1829 }
1830 break;
1831
1832 case R_CRIS_16_GOTPLT:
1833 case R_CRIS_32_GOTPLT:
1834 /* For local symbols, treat these like GOT relocs. */
1835 r_symndx = ELF32_R_SYM (rel->r_info);
1836 if (r_symndx < symtab_hdr->sh_info)
1837 goto local_got_reloc;
1838
1839 case R_CRIS_32_PLT_GOTREL:
1840 /* FIXME: We don't garbage-collect away the .got section. */
1841 if (local_got_refcounts != NULL)
1842 local_got_refcounts[-1]--;
1843 /* Fall through. */
1844
1845 case R_CRIS_8_PCREL:
1846 case R_CRIS_16_PCREL:
1847 case R_CRIS_32_PCREL:
1848 case R_CRIS_32_PLT_PCREL:
1849 r_symndx = ELF32_R_SYM (rel->r_info);
1850 if (r_symndx >= symtab_hdr->sh_info)
1851 {
1852 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1853 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1854 && h->plt.refcount > 0)
1855 --h->plt.refcount;
1856 }
1857 break;
1858
1859 default:
1860 break;
1861 }
1862 }
1863
1864 return TRUE;
1865 }
1866
1867 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1868 entry but we found we will not create any. Called when we find we will
1869 not have any PLT for this symbol, by for example
1870 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link,
1871 or elf_cris_size_dynamic_sections if no dynamic sections will be
1872 created (we're only linking static objects). */
1873
1874 static bfd_boolean
1875 elf_cris_adjust_gotplt_to_got (h, p)
1876 struct elf_cris_link_hash_entry *h;
1877 PTR p;
1878 {
1879 struct bfd_link_info *info = (struct bfd_link_info *) p;
1880 bfd *dynobj = elf_hash_table (info)->dynobj;
1881
1882 BFD_ASSERT (dynobj != NULL);
1883
1884 if (h->root.root.type == bfd_link_hash_warning)
1885 h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link;
1886
1887 /* If nobody wanted a GOTPLT with this symbol, we're done. */
1888 if (h->gotplt_refcount <= 0)
1889 return TRUE;
1890
1891 if (h->root.got.refcount > 0)
1892 {
1893 /* There's a GOT entry for this symbol. Just adjust the refcount.
1894 Probably not necessary at this stage, but keeping it accurate
1895 helps avoiding surprises later. */
1896 h->root.got.refcount += h->gotplt_refcount;
1897 h->gotplt_refcount = -1;
1898 }
1899 else
1900 {
1901 /* No GOT entry for this symbol. We need to create one. */
1902 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
1903 asection *srelgot
1904 = bfd_get_section_by_name (dynobj, ".rela.got");
1905
1906 /* Put an accurate refcount there. */
1907 h->root.got.refcount = h->gotplt_refcount;
1908
1909 h->gotplt_refcount = -1;
1910
1911 /* We always have a .got and a .rela.got section if there were
1912 GOTPLT relocs in input. */
1913 BFD_ASSERT (sgot != NULL && srelgot != NULL);
1914
1915 /* Allocate space in the .got section. */
1916 sgot->_raw_size += 4;
1917
1918 /* Allocate relocation space. */
1919 srelgot->_raw_size += sizeof (Elf32_External_Rela);
1920 }
1921
1922 return TRUE;
1923 }
1924
1925 /* Try to fold PLT entries with GOT entries. There are two cases when we
1926 want to do this:
1927
1928 - When all PLT references are GOTPLT references, and there are GOT
1929 references. We don't have to generate a PLT at all.
1930
1931 - When there are both (ordinary) PLT references and GOT references.
1932 We want to make the PLT reference use the ordinary GOT entry rather
1933 than a run-time dynamically resolved GOTPLT entry (since the GOT
1934 entry will have to be resolved at startup anyway).
1935
1936 Though the latter case is handled when room for the PLT is allocated,
1937 not here.
1938
1939 Note that this function is called before symbols are forced local by
1940 version scripts. The differing cases are handled by
1941 elf_cris_hide_symbol. */
1942
1943 static bfd_boolean
1944 elf_cris_try_fold_plt_to_got (h, p)
1945 struct elf_cris_link_hash_entry *h;
1946 PTR p;
1947 {
1948 struct bfd_link_info *info = (struct bfd_link_info *) p;
1949
1950 /* If there are no GOT references for this symbol, we can't fold any
1951 other reference so there's nothing to do. Likewise if there are no
1952 PLT references; GOTPLT references included. */
1953 if (h->root.got.refcount <= 0 || h->root.plt.refcount <= 0)
1954 return TRUE;
1955
1956 /* GOTPLT relocs are supposed to be included into the PLT refcount. */
1957 BFD_ASSERT (h->gotplt_refcount <= h->root.plt.refcount);
1958
1959 if (h->gotplt_refcount == h->root.plt.refcount)
1960 {
1961 /* The only PLT references are GOTPLT references, and there are GOT
1962 references. Convert PLT to GOT references. */
1963 if (! elf_cris_adjust_gotplt_to_got (h, info))
1964 return FALSE;
1965
1966 /* Clear the PLT references, so no PLT will be created. */
1967 h->root.plt.offset = (bfd_vma) -1;
1968 }
1969
1970 return TRUE;
1971 }
1972
1973 /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc
1974 to use a GOT entry (and create one) rather than requiring a GOTPLT
1975 entry. */
1976
1977 static void
1978 elf_cris_hide_symbol (info, h, force_local)
1979 struct bfd_link_info *info;
1980 struct elf_link_hash_entry *h;
1981 bfd_boolean force_local;
1982 {
1983 elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info);
1984
1985 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
1986 }
1987
1988 /* Adjust a symbol defined by a dynamic object and referenced by a
1989 regular object. The current definition is in some section of the
1990 dynamic object, but we're not including those sections. We have to
1991 change the definition to something the rest of the link can
1992 understand. */
1993
1994 static bfd_boolean
1995 elf_cris_adjust_dynamic_symbol (info, h)
1996 struct bfd_link_info *info;
1997 struct elf_link_hash_entry *h;
1998 {
1999 bfd *dynobj;
2000 asection *s;
2001 unsigned int power_of_two;
2002
2003 dynobj = elf_hash_table (info)->dynobj;
2004
2005 /* Make sure we know what is going on here. */
2006 BFD_ASSERT (dynobj != NULL
2007 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
2008 || h->weakdef != NULL
2009 || ((h->elf_link_hash_flags
2010 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2011 && (h->elf_link_hash_flags
2012 & ELF_LINK_HASH_REF_REGULAR) != 0
2013 && (h->elf_link_hash_flags
2014 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
2015
2016 /* If this is a function, put it in the procedure linkage table. We
2017 will fill in the contents of the procedure linkage table later,
2018 when we know the address of the .got section. */
2019 if (h->type == STT_FUNC
2020 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
2021 {
2022 /* If we link a program (not a DSO), we'll get rid of unnecessary
2023 PLT entries; we point to the actual symbols -- even for pic
2024 relocs, because a program built with -fpic should have the same
2025 result as one built without -fpic, specifically considering weak
2026 symbols.
2027 FIXME: m68k and i386 differ here, for unclear reasons. */
2028 if (! info->shared
2029 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0)
2030 {
2031 /* This case can occur if we saw a PLT reloc in an input file,
2032 but the symbol was not defined by a dynamic object. In such
2033 a case, we don't actually need to build a procedure linkage
2034 table, and we can just do an absolute or PC reloc instead, or
2035 change a .got.plt index to a .got index for GOTPLT relocs. */
2036 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
2037 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
2038 h->plt.offset = (bfd_vma) -1;
2039 return
2040 elf_cris_adjust_gotplt_to_got ((struct
2041 elf_cris_link_hash_entry *) h,
2042 info);
2043 }
2044
2045 /* If there are only GOT references and GOTPLT references to this
2046 PLT entry, get rid of the PLT. */
2047 if (! elf_cris_try_fold_plt_to_got ((struct elf_cris_link_hash_entry *)
2048 h, info))
2049 return FALSE;
2050
2051 /* GC or folding may have rendered this entry unused. */
2052 if (h->plt.refcount <= 0)
2053 {
2054 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
2055 h->plt.offset = (bfd_vma) -1;
2056 return TRUE;
2057 }
2058
2059 /* Make sure this symbol is output as a dynamic symbol. */
2060 if (h->dynindx == -1)
2061 {
2062 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
2063 return FALSE;
2064 }
2065
2066 s = bfd_get_section_by_name (dynobj, ".plt");
2067 BFD_ASSERT (s != NULL);
2068
2069 /* If this is the first .plt entry, make room for the special
2070 first entry. */
2071 if (s->_raw_size == 0)
2072 s->_raw_size += PLT_ENTRY_SIZE;
2073
2074 /* If this symbol is not defined in a regular file, and we are
2075 not generating a shared library, then set the symbol to this
2076 location in the .plt. */
2077 if (!info->shared
2078 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2079 {
2080 h->root.u.def.section = s;
2081 h->root.u.def.value = s->_raw_size;
2082 }
2083
2084 /* If there's already a GOT entry, use that, not a .got.plt. A
2085 GOT field still has a reference count when we get here; it's
2086 not yet changed to an offset. */
2087 if (h->got.refcount > 0)
2088 {
2089 h->got.refcount += h->plt.refcount;
2090
2091 /* Mark the PLT offset to use the GOT entry by setting the low
2092 bit in the plt offset; it is always a multiple of
2093 pointer-size. */
2094 BFD_ASSERT ((s->_raw_size & 3) == 0);
2095
2096 /* Change the PLT refcount to an offset. */
2097 h->plt.offset = s->_raw_size;
2098
2099 /* By not setting gotplt_offset (i.e. it remains at 0), we signal
2100 that the got entry should be used instead. */
2101 BFD_ASSERT (((struct elf_cris_link_hash_entry *)
2102 h)->gotplt_offset == 0);
2103
2104 /* Make room for this entry. */
2105 s->_raw_size += PLT_ENTRY_SIZE;
2106
2107 return TRUE;
2108 }
2109
2110 /* No GOT reference for this symbol; prepare for an ordinary PLT. */
2111 h->plt.offset = s->_raw_size;
2112
2113 /* Make room for this entry. */
2114 s->_raw_size += PLT_ENTRY_SIZE;
2115
2116 /* We also need to make an entry in the .got.plt section, which
2117 will be placed in the .got section by the linker script. */
2118 ((struct elf_cris_link_hash_entry *) h)->gotplt_offset
2119 = elf_cris_hash_table (info)->next_gotplt_entry;
2120 elf_cris_hash_table (info)->next_gotplt_entry += 4;
2121
2122 s = bfd_get_section_by_name (dynobj, ".got.plt");
2123 BFD_ASSERT (s != NULL);
2124 s->_raw_size += 4;
2125
2126 /* We also need to make an entry in the .rela.plt section. */
2127
2128 s = bfd_get_section_by_name (dynobj, ".rela.plt");
2129 BFD_ASSERT (s != NULL);
2130 s->_raw_size += sizeof (Elf32_External_Rela);
2131
2132 return TRUE;
2133 }
2134
2135 /* Reinitialize the plt offset now that it is not used as a reference
2136 count any more. */
2137 h->plt.offset = (bfd_vma) -1;
2138
2139 /* If this is a weak symbol, and there is a real definition, the
2140 processor independent code will have arranged for us to see the
2141 real definition first, and we can just use the same value. */
2142 if (h->weakdef != NULL)
2143 {
2144 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
2145 || h->weakdef->root.type == bfd_link_hash_defweak);
2146 h->root.u.def.section = h->weakdef->root.u.def.section;
2147 h->root.u.def.value = h->weakdef->root.u.def.value;
2148 return TRUE;
2149 }
2150
2151 /* This is a reference to a symbol defined by a dynamic object which
2152 is not a function. */
2153
2154 /* If we are creating a shared library, we must presume that the
2155 only references to the symbol are via the global offset table.
2156 For such cases we need not do anything here; the relocations will
2157 be handled correctly by relocate_section. */
2158 if (info->shared)
2159 return TRUE;
2160
2161 /* If there are no references to this symbol that do not use the
2162 GOT, we don't need to generate a copy reloc. */
2163 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
2164 return TRUE;
2165
2166 /* We must allocate the symbol in our .dynbss section, which will
2167 become part of the .bss section of the executable. There will be
2168 an entry for this symbol in the .dynsym section. The dynamic
2169 object will contain position independent code, so all references
2170 from the dynamic object to this symbol will go through the global
2171 offset table. The dynamic linker will use the .dynsym entry to
2172 determine the address it must put in the global offset table, so
2173 both the dynamic object and the regular object will refer to the
2174 same memory location for the variable. */
2175
2176 s = bfd_get_section_by_name (dynobj, ".dynbss");
2177 BFD_ASSERT (s != NULL);
2178
2179 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to
2180 copy the initial value out of the dynamic object and into the
2181 runtime process image. We need to remember the offset into the
2182 .rela.bss section we are going to use. */
2183 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2184 {
2185 asection *srel;
2186
2187 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
2188 BFD_ASSERT (srel != NULL);
2189 srel->_raw_size += sizeof (Elf32_External_Rela);
2190 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
2191 }
2192
2193 /* Historic precedent: m68k and i386 allow max 8-byte alignment for the
2194 thing to copy; so do we. */
2195
2196 /* We need to figure out the alignment required for this symbol. I
2197 have no idea how ELF linkers handle this. */
2198 power_of_two = bfd_log2 (h->size);
2199 if (power_of_two > 3)
2200 power_of_two = 3;
2201
2202 /* Apply the required alignment. */
2203 s->_raw_size = BFD_ALIGN (s->_raw_size,
2204 (bfd_size_type) (1 << power_of_two));
2205 if (power_of_two > bfd_get_section_alignment (dynobj, s))
2206 {
2207 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
2208 return FALSE;
2209 }
2210
2211 /* Define the symbol as being at this point in the section. */
2212 h->root.u.def.section = s;
2213 h->root.u.def.value = s->_raw_size;
2214
2215 /* Increment the section size to make room for the symbol. */
2216 s->_raw_size += h->size;
2217
2218 return TRUE;
2219 }
2220
2221 /* Look through the relocs for a section during the first phase. */
2222
2223 static bfd_boolean
2224 cris_elf_check_relocs (abfd, info, sec, relocs)
2225 bfd *abfd;
2226 struct bfd_link_info *info;
2227 asection *sec;
2228 const Elf_Internal_Rela *relocs;
2229 {
2230 bfd *dynobj;
2231 Elf_Internal_Shdr *symtab_hdr;
2232 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
2233 bfd_signed_vma *local_got_refcounts;
2234 const Elf_Internal_Rela *rel;
2235 const Elf_Internal_Rela *rel_end;
2236 asection *sgot;
2237 asection *srelgot;
2238 asection *sreloc;
2239
2240 if (info->relocatable)
2241 return TRUE;
2242
2243 dynobj = elf_hash_table (info)->dynobj;
2244 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2245 sym_hashes = elf_sym_hashes (abfd);
2246 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
2247 local_got_refcounts = elf_local_got_refcounts (abfd);
2248
2249 sgot = NULL;
2250 srelgot = NULL;
2251 sreloc = NULL;
2252
2253 if (!elf_bad_symtab (abfd))
2254 sym_hashes_end -= symtab_hdr->sh_info;
2255
2256 rel_end = relocs + sec->reloc_count;
2257 for (rel = relocs; rel < rel_end; rel++)
2258 {
2259 struct elf_link_hash_entry *h;
2260 unsigned long r_symndx;
2261 enum elf_cris_reloc_type r_type;
2262
2263 r_symndx = ELF32_R_SYM (rel->r_info);
2264 if (r_symndx < symtab_hdr->sh_info)
2265 h = NULL;
2266 else
2267 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2268
2269 r_type = ELF32_R_TYPE (rel->r_info);
2270
2271 /* Some relocs require linker-created sections; we need to hang them
2272 on the first input bfd we found that contained dynamic relocs. */
2273 switch (r_type)
2274 {
2275 case R_CRIS_16_GOT:
2276 case R_CRIS_32_GOT:
2277 case R_CRIS_32_GOTREL:
2278 case R_CRIS_32_PLT_GOTREL:
2279 case R_CRIS_32_PLT_PCREL:
2280 case R_CRIS_16_GOTPLT:
2281 case R_CRIS_32_GOTPLT:
2282 if (dynobj == NULL)
2283 {
2284 elf_hash_table (info)->dynobj = dynobj = abfd;
2285
2286 /* Create the .got section, so we can assume it's always
2287 present whenever there's a dynobj. */
2288 if (!_bfd_elf_create_got_section (dynobj, info))
2289 return FALSE;
2290 }
2291 break;
2292
2293 default:
2294 break;
2295 }
2296
2297 /* Some relocs require a global offset table (but perhaps not a
2298 specific GOT entry). */
2299 switch (r_type)
2300 {
2301 /* For R_CRIS_16_GOTPLT and R_CRIS_32_GOTPLT, we need a GOT
2302 entry only for local symbols. Unfortunately, we don't know
2303 until later on if there's a version script that forces the
2304 symbol local. We must have the .rela.got section in place
2305 before we know if the symbol looks global now, so we need
2306 to treat the reloc just like for R_CRIS_16_GOT and
2307 R_CRIS_32_GOT. */
2308 case R_CRIS_16_GOTPLT:
2309 case R_CRIS_32_GOTPLT:
2310 case R_CRIS_16_GOT:
2311 case R_CRIS_32_GOT:
2312 if (srelgot == NULL
2313 && (h != NULL || info->shared))
2314 {
2315 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2316 if (srelgot == NULL)
2317 {
2318 srelgot = bfd_make_section (dynobj, ".rela.got");
2319 if (srelgot == NULL
2320 || !bfd_set_section_flags (dynobj, srelgot,
2321 (SEC_ALLOC
2322 | SEC_LOAD
2323 | SEC_HAS_CONTENTS
2324 | SEC_IN_MEMORY
2325 | SEC_LINKER_CREATED
2326 | SEC_READONLY))
2327 || !bfd_set_section_alignment (dynobj, srelgot, 2))
2328 return FALSE;
2329 }
2330 }
2331 /* Fall through. */
2332
2333 case R_CRIS_32_GOTREL:
2334 case R_CRIS_32_PLT_GOTREL:
2335 if (sgot == NULL)
2336 sgot = bfd_get_section_by_name (dynobj, ".got");
2337
2338 if (local_got_refcounts == NULL)
2339 {
2340 bfd_size_type amt;
2341
2342 /* We use index local_got_refcounts[-1] to count all
2343 GOT-relative relocations that do not have explicit
2344 GOT entries. */
2345 amt = symtab_hdr->sh_info + 1;
2346 amt *= sizeof (bfd_signed_vma);
2347 local_got_refcounts = ((bfd_signed_vma *) bfd_zalloc (abfd, amt));
2348 if (local_got_refcounts == NULL)
2349 return FALSE;
2350
2351 local_got_refcounts++;
2352 elf_local_got_refcounts (abfd) = local_got_refcounts;
2353 }
2354 break;
2355
2356 default:
2357 break;
2358 }
2359
2360 switch (r_type)
2361 {
2362 case R_CRIS_16_GOTPLT:
2363 case R_CRIS_32_GOTPLT:
2364 /* Mark that we need a GOT entry if the PLT entry (and its GOT
2365 entry) is eliminated. We can only do this for a non-local
2366 symbol. */
2367 if (h != NULL)
2368 {
2369 ((struct elf_cris_link_hash_entry *) h)->gotplt_refcount++;
2370 goto handle_gotplt_reloc;
2371 }
2372 /* If h is NULL then this is a local symbol, and we must make a
2373 GOT entry for it, so handle it like a GOT reloc. */
2374 /* Fall through. */
2375
2376 case R_CRIS_16_GOT:
2377 case R_CRIS_32_GOT:
2378 /* This symbol requires a global offset table entry. */
2379 if (h != NULL)
2380 {
2381 if (h->got.refcount == 0)
2382 {
2383 /* Make sure this symbol is output as a dynamic symbol. */
2384 if (h->dynindx == -1)
2385 {
2386 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
2387 return FALSE;
2388 }
2389
2390 /* Allocate space in the .got section. */
2391 sgot->_raw_size += 4;
2392 /* Allocate relocation space. */
2393 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2394 }
2395 h->got.refcount++;
2396 }
2397 else
2398 {
2399 /* This is a global offset table entry for a local symbol. */
2400 if (local_got_refcounts[r_symndx] == 0)
2401 {
2402 sgot->_raw_size += 4;
2403 if (info->shared)
2404 {
2405 /* If we are generating a shared object, we need to
2406 output a R_CRIS_RELATIVE reloc so that the dynamic
2407 linker can adjust this GOT entry. */
2408 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2409 }
2410 }
2411 local_got_refcounts[r_symndx]++;
2412 }
2413 break;
2414
2415 case R_CRIS_32_GOTREL:
2416 /* This reference requires a global offset table.
2417 FIXME: The actual refcount isn't used currently; the .got
2418 section can't be removed if there were any references in the
2419 input. */
2420 local_got_refcounts[-1]++;
2421 break;
2422
2423 handle_gotplt_reloc:
2424
2425 case R_CRIS_32_PLT_GOTREL:
2426 /* This reference requires a global offset table. */
2427 local_got_refcounts[-1]++;
2428 /* Fall through. */
2429
2430 case R_CRIS_32_PLT_PCREL:
2431 /* This symbol requires a procedure linkage table entry. We
2432 actually build the entry in adjust_dynamic_symbol,
2433 because this might be a case of linking PIC code which is
2434 never referenced by a dynamic object, in which case we
2435 don't need to generate a procedure linkage table entry
2436 after all. */
2437
2438 /* If this is a local symbol, we resolve it directly without
2439 creating a procedure linkage table entry. */
2440 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2441 continue;
2442
2443 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
2444 h->plt.refcount++;
2445 break;
2446
2447 case R_CRIS_8:
2448 case R_CRIS_16:
2449 case R_CRIS_32:
2450 /* Let's help debug shared library creation. Any of these
2451 relocs can be used in shared libs, but pages containing them
2452 cannot be shared. Don't warn for sections we don't care
2453 about, such as debug sections or non-constant sections. We
2454 can't help tables of (global) function pointers, for example,
2455 though they must be emitted in a data section to avoid having
2456 impure text sections. */
2457 if (info->shared
2458 && (sec->flags & SEC_ALLOC) != 0
2459 && (sec->flags & SEC_READONLY) != 0)
2460 {
2461 /* FIXME: How do we make this optionally a warning only? */
2462 (*_bfd_error_handler)
2463 (_("%s, section %s:\n relocation %s should not be used in a shared object; recompile with -fPIC"),
2464 bfd_archive_filename (abfd),
2465 sec->name,
2466 cris_elf_howto_table[r_type].name);
2467 }
2468 /* Fall through. */
2469
2470 case R_CRIS_8_PCREL:
2471 case R_CRIS_16_PCREL:
2472 case R_CRIS_32_PCREL:
2473 if (h != NULL)
2474 {
2475 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
2476
2477 /* Make sure a plt entry is created for this symbol if it
2478 turns out to be a function defined by a dynamic object. */
2479 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2480 h->plt.refcount++;
2481 }
2482
2483 /* If we are creating a shared library and this is not a local
2484 symbol, we need to copy the reloc into the shared library.
2485 However when linking with -Bsymbolic and this is a global
2486 symbol which is defined in an object we are including in the
2487 link (i.e., DEF_REGULAR is set), then we can resolve the
2488 reloc directly. At this point we have not seen all the input
2489 files, so it is possible that DEF_REGULAR is not set now but
2490 will be set later (it is never cleared). In case of a weak
2491 definition, DEF_REGULAR may be cleared later by a strong
2492 definition in a shared library. We account for that
2493 possibility below by storing information in the relocs_copied
2494 field of the hash table entry. A similar situation occurs
2495 when creating shared libraries and symbol visibility changes
2496 render the symbol local. */
2497
2498 /* No need to do anything if we're not creating a shared object. */
2499 if (! info->shared)
2500 break;
2501
2502 /* We don't need to handle relocs into sections not going into
2503 the "real" output. */
2504 if ((sec->flags & SEC_ALLOC) == 0)
2505 break;
2506
2507 /* We can only eliminate PC-relative relocs. */
2508 if (r_type == R_CRIS_8_PCREL
2509 || r_type == R_CRIS_16_PCREL
2510 || r_type == R_CRIS_32_PCREL)
2511 {
2512 /* If the symbol is local, then we can eliminate the reloc. */
2513 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2514 break;
2515
2516 /* If this is with -Bsymbolic and the symbol isn't weak, and
2517 is defined by an ordinary object (the ones we include in
2518 this shared library) then we can also eliminate the
2519 reloc. See comment above for more eliminable cases which
2520 we can't identify at this time. */
2521 if (info->symbolic
2522 && h->root.type != bfd_link_hash_defweak
2523 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
2524 break;
2525 }
2526
2527 /* We create a reloc section in dynobj and make room for this
2528 reloc. */
2529 if (sreloc == NULL)
2530 {
2531 const char *name;
2532
2533 name = (bfd_elf_string_from_elf_section
2534 (abfd,
2535 elf_elfheader (abfd)->e_shstrndx,
2536 elf_section_data (sec)->rel_hdr.sh_name));
2537 if (name == NULL)
2538 return FALSE;
2539
2540 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
2541 && strcmp (bfd_get_section_name (abfd, sec),
2542 name + 5) == 0);
2543
2544 sreloc = bfd_get_section_by_name (dynobj, name);
2545 if (sreloc == NULL)
2546 {
2547 sreloc = bfd_make_section (dynobj, name);
2548 if (sreloc == NULL
2549 || !bfd_set_section_flags (dynobj, sreloc,
2550 (SEC_ALLOC
2551 | SEC_LOAD
2552 | SEC_HAS_CONTENTS
2553 | SEC_IN_MEMORY
2554 | SEC_LINKER_CREATED
2555 | SEC_READONLY))
2556 || !bfd_set_section_alignment (dynobj, sreloc, 2))
2557 return FALSE;
2558 }
2559 if (sec->flags & SEC_READONLY)
2560 info->flags |= DF_TEXTREL;
2561 }
2562
2563 sreloc->_raw_size += sizeof (Elf32_External_Rela);
2564
2565 /* If we are linking with -Bsymbolic, we count the number of PC
2566 relative relocations we have entered for this symbol, so that
2567 we can discard them again if the symbol is later defined by a
2568 regular object. We know that h is really a pointer to an
2569 elf_cris_link_hash_entry. */
2570 if ((r_type == R_CRIS_8_PCREL
2571 || r_type == R_CRIS_16_PCREL
2572 || r_type == R_CRIS_32_PCREL)
2573 && info->symbolic)
2574 {
2575 struct elf_cris_link_hash_entry *eh;
2576 struct elf_cris_pcrel_relocs_copied *p;
2577
2578 eh = (struct elf_cris_link_hash_entry *) h;
2579
2580 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
2581 if (p->section == sreloc)
2582 break;
2583
2584 if (p == NULL)
2585 {
2586 p = ((struct elf_cris_pcrel_relocs_copied *)
2587 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
2588 if (p == NULL)
2589 return FALSE;
2590 p->next = eh->pcrel_relocs_copied;
2591 eh->pcrel_relocs_copied = p;
2592 p->section = sreloc;
2593 p->count = 0;
2594 }
2595
2596 ++p->count;
2597 }
2598 break;
2599
2600 /* This relocation describes the C++ object vtable hierarchy.
2601 Reconstruct it for later use during GC. */
2602 case R_CRIS_GNU_VTINHERIT:
2603 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2604 return FALSE;
2605 break;
2606
2607 /* This relocation describes which C++ vtable entries are actually
2608 used. Record for later use during GC. */
2609 case R_CRIS_GNU_VTENTRY:
2610 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2611 return FALSE;
2612 break;
2613
2614 default:
2615 /* Other relocs do not appear here. */
2616 bfd_set_error (bfd_error_bad_value);
2617 return FALSE;
2618 }
2619 }
2620
2621 return TRUE;
2622 }
2623
2624 /* Set the sizes of the dynamic sections. */
2625
2626 static bfd_boolean
2627 elf_cris_size_dynamic_sections (output_bfd, info)
2628 bfd *output_bfd ATTRIBUTE_UNUSED;
2629 struct bfd_link_info *info;
2630 {
2631 bfd *dynobj;
2632 asection *s;
2633 bfd_boolean plt;
2634 bfd_boolean relocs;
2635
2636 dynobj = elf_hash_table (info)->dynobj;
2637 BFD_ASSERT (dynobj != NULL);
2638
2639 if (elf_hash_table (info)->dynamic_sections_created)
2640 {
2641 /* Set the contents of the .interp section to the interpreter. */
2642 if (info->executable)
2643 {
2644 s = bfd_get_section_by_name (dynobj, ".interp");
2645 BFD_ASSERT (s != NULL);
2646 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
2647 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2648 }
2649 }
2650 else
2651 {
2652 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */
2653 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2654 elf_cris_adjust_gotplt_to_got,
2655 (PTR) info);
2656
2657 /* We may have created entries in the .rela.got section.
2658 However, if we are not creating the dynamic sections, we will
2659 not actually use these entries. Reset the size of .rela.got,
2660 which will cause it to get stripped from the output file
2661 below. */
2662 s = bfd_get_section_by_name (dynobj, ".rela.got");
2663 if (s != NULL)
2664 s->_raw_size = 0;
2665 }
2666
2667 /* If this is a -Bsymbolic shared link, then we need to discard all PC
2668 relative relocs against symbols defined in a regular object. We
2669 allocated space for them in the check_relocs routine, but we will not
2670 fill them in in the relocate_section routine. We also discard space
2671 for relocs that have become for local symbols due to symbol
2672 visibility changes. For programs, we discard space for relocs for
2673 symbols not referenced by any dynamic object. */
2674 if (info->shared)
2675 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2676 elf_cris_discard_excess_dso_dynamics,
2677 (PTR) info);
2678 else
2679 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2680 elf_cris_discard_excess_program_dynamics,
2681 (PTR) info);
2682
2683 /* The check_relocs and adjust_dynamic_symbol entry points have
2684 determined the sizes of the various dynamic sections. Allocate
2685 memory for them. */
2686 plt = FALSE;
2687 relocs = FALSE;
2688 for (s = dynobj->sections; s != NULL; s = s->next)
2689 {
2690 const char *name;
2691 bfd_boolean strip;
2692
2693 if ((s->flags & SEC_LINKER_CREATED) == 0)
2694 continue;
2695
2696 /* It's OK to base decisions on the section name, because none
2697 of the dynobj section names depend upon the input files. */
2698 name = bfd_get_section_name (dynobj, s);
2699
2700 strip = FALSE;
2701
2702 if (strcmp (name, ".plt") == 0)
2703 {
2704 if (s->_raw_size == 0)
2705 {
2706 /* Strip this section if we don't need it; see the
2707 comment below. */
2708 strip = TRUE;
2709 }
2710 else
2711 {
2712 /* Remember whether there is a PLT. */
2713 plt = TRUE;
2714 }
2715 }
2716 else if (strncmp (name, ".rela", 5) == 0)
2717 {
2718 if (s->_raw_size == 0)
2719 {
2720 /* If we don't need this section, strip it from the
2721 output file. This is mostly to handle .rela.bss and
2722 .rela.plt. We must create both sections in
2723 create_dynamic_sections, because they must be created
2724 before the linker maps input sections to output
2725 sections. The linker does that before
2726 adjust_dynamic_symbol is called, and it is that
2727 function which decides whether anything needs to go
2728 into these sections. */
2729 strip = TRUE;
2730 }
2731 else
2732 {
2733 /* Remember whether there are any reloc sections other
2734 than .rela.plt. */
2735 if (strcmp (name, ".rela.plt") != 0)
2736 relocs = TRUE;
2737
2738 /* We use the reloc_count field as a counter if we need
2739 to copy relocs into the output file. */
2740 s->reloc_count = 0;
2741 }
2742 }
2743 else if (strncmp (name, ".got", 4) != 0)
2744 {
2745 /* It's not one of our sections, so don't allocate space. */
2746 continue;
2747 }
2748
2749 if (strip)
2750 {
2751 _bfd_strip_section_from_output (info, s);
2752 continue;
2753 }
2754
2755 /* Allocate memory for the section contents. We use bfd_zalloc here
2756 in case unused entries are not reclaimed before the section's
2757 contents are written out. This should not happen, but this way
2758 if it does, we will not write out garbage. For reloc sections,
2759 this will make entries have the type R_CRIS_NONE. */
2760 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
2761 if (s->contents == NULL && s->_raw_size != 0)
2762 return FALSE;
2763 }
2764
2765 if (elf_hash_table (info)->dynamic_sections_created)
2766 {
2767 /* Add some entries to the .dynamic section. We fill in the
2768 values later, in elf_cris_finish_dynamic_sections, but we
2769 must add the entries now so that we get the correct size for
2770 the .dynamic section. The DT_DEBUG entry is filled in by the
2771 dynamic linker and used by the debugger. */
2772 #define add_dynamic_entry(TAG, VAL) \
2773 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
2774
2775 if (!info->shared)
2776 {
2777 if (!add_dynamic_entry (DT_DEBUG, 0))
2778 return FALSE;
2779 }
2780
2781 if (plt)
2782 {
2783 if (!add_dynamic_entry (DT_PLTGOT, 0)
2784 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2785 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2786 || !add_dynamic_entry (DT_JMPREL, 0))
2787 return FALSE;
2788 }
2789
2790 if (relocs)
2791 {
2792 if (!add_dynamic_entry (DT_RELA, 0)
2793 || !add_dynamic_entry (DT_RELASZ, 0)
2794 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2795 return FALSE;
2796 }
2797
2798 if ((info->flags & DF_TEXTREL) != 0)
2799 {
2800 if (!add_dynamic_entry (DT_TEXTREL, 0))
2801 return FALSE;
2802 info->flags |= DF_TEXTREL;
2803 }
2804 }
2805 #undef add_dynamic_entry
2806
2807 return TRUE;
2808 }
2809
2810 /* This function is called via elf_cris_link_hash_traverse if we are
2811 creating a shared object. In the -Bsymbolic case, it discards the
2812 space allocated to copy PC relative relocs against symbols which
2813 are defined in regular objects. For the normal non-symbolic case,
2814 we also discard space for relocs that have become local due to
2815 symbol visibility changes. We allocated space for them in the
2816 check_relocs routine, but we won't fill them in in the
2817 relocate_section routine. */
2818
2819 static bfd_boolean
2820 elf_cris_discard_excess_dso_dynamics (h, inf)
2821 struct elf_cris_link_hash_entry *h;
2822 PTR inf;
2823 {
2824 struct elf_cris_pcrel_relocs_copied *s;
2825 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2826
2827 if (h->root.root.type == bfd_link_hash_warning)
2828 h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link;
2829
2830 /* If a symbol has been forced local or we have found a regular
2831 definition for the symbolic link case, then we won't be needing
2832 any relocs. */
2833 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
2834 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
2835 || info->symbolic))
2836 {
2837 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
2838 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
2839 }
2840
2841 return TRUE;
2842 }
2843
2844 /* This function is called via elf_cris_link_hash_traverse if we are *not*
2845 creating a shared object. We discard space for relocs for symbols put
2846 in the .got, but which we found we do not have to resolve at run-time. */
2847
2848 static bfd_boolean
2849 elf_cris_discard_excess_program_dynamics (h, inf)
2850 struct elf_cris_link_hash_entry *h;
2851 PTR inf;
2852 {
2853 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2854
2855 if (h->root.root.type == bfd_link_hash_warning)
2856 h = (struct elf_cris_link_hash_entry *) h->root.root.u.i.link;
2857
2858 /* If we're not creating a shared library and have a symbol which is
2859 referred to by .got references, but the symbol is defined locally,
2860 (or rather, not not defined by a DSO) then lose the reloc for the
2861 .got (don't allocate room for it). */
2862 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0)
2863 {
2864 if (h->root.got.refcount > 0
2865 /* The size of this section is only valid and in sync with the
2866 various reference counts if we do dynamic; don't decrement it
2867 otherwise. */
2868 && elf_hash_table (info)->dynamic_sections_created)
2869 {
2870 bfd *dynobj = elf_hash_table (info)->dynobj;
2871 asection *srelgot;
2872
2873 BFD_ASSERT (dynobj != NULL);
2874
2875 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2876
2877 BFD_ASSERT (srelgot != NULL);
2878
2879 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
2880 }
2881
2882 /* If the locally-defined symbol isn't used by a DSO, then we don't
2883 have to export it as a dynamic symbol. This was already done for
2884 functions; doing this for all symbols would presumably not
2885 introduce new problems. Of course we don't do this if we're
2886 exporting all dynamic symbols. */
2887 if (! info->export_dynamic
2888 && (h->root.elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)
2889 {
2890 h->root.dynindx = -1;
2891 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2892 h->root.dynstr_index);
2893 }
2894 }
2895
2896 return TRUE;
2897 }
2898
2899 /* Reject a file depending on presence and expectation of prefixed
2900 underscores on symbols. */
2901
2902 static bfd_boolean
2903 cris_elf_object_p (abfd)
2904 bfd *abfd;
2905 {
2906 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE))
2907 return (bfd_get_symbol_leading_char (abfd) == '_');
2908 else
2909 return (bfd_get_symbol_leading_char (abfd) == 0);
2910 }
2911
2912 /* Mark presence or absence of leading underscore. */
2913
2914 static void
2915 cris_elf_final_write_processing (abfd, linker)
2916 bfd *abfd;
2917 bfd_boolean linker ATTRIBUTE_UNUSED;
2918 {
2919 if (bfd_get_symbol_leading_char (abfd) == '_')
2920 elf_elfheader (abfd)->e_flags |= EF_CRIS_UNDERSCORE;
2921 else
2922 elf_elfheader (abfd)->e_flags &= ~EF_CRIS_UNDERSCORE;
2923 }
2924
2925 /* Display the flags field. */
2926
2927 static bfd_boolean
2928 cris_elf_print_private_bfd_data (abfd, ptr)
2929 bfd *abfd;
2930 PTR ptr;
2931 {
2932 FILE *file = (FILE *) ptr;
2933
2934 BFD_ASSERT (abfd != NULL && ptr != NULL)
2935
2936 _bfd_elf_print_private_bfd_data (abfd, ptr);
2937
2938 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
2939
2940 if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)
2941 fprintf (file, _(" [symbols have a _ prefix]"));
2942
2943 fputc ('\n', file);
2944 return TRUE;
2945 }
2946
2947 /* Don't mix files with and without a leading underscore. */
2948
2949 static bfd_boolean
2950 cris_elf_merge_private_bfd_data (ibfd, obfd)
2951 bfd *ibfd;
2952 bfd *obfd;
2953 {
2954 flagword old_flags, new_flags;
2955
2956 if (! _bfd_generic_verify_endian_match (ibfd, obfd))
2957 return FALSE;
2958
2959 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2960 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2961 return TRUE;
2962
2963 if (! elf_flags_init (obfd))
2964 {
2965 /* This happens when ld starts out with a 'blank' output file. */
2966 elf_flags_init (obfd) = TRUE;
2967
2968 /* Set flags according to current bfd_target. */
2969 cris_elf_final_write_processing (obfd, FALSE);
2970 }
2971
2972 old_flags = elf_elfheader (obfd)->e_flags;
2973 new_flags = elf_elfheader (ibfd)->e_flags;
2974
2975 /* Is this good or bad? We'll follow with other excluding flags. */
2976 if ((old_flags & EF_CRIS_UNDERSCORE) != (new_flags & EF_CRIS_UNDERSCORE))
2977 {
2978 (*_bfd_error_handler)
2979 ((new_flags & EF_CRIS_UNDERSCORE)
2980 ? _("%s: uses _-prefixed symbols, but writing file with non-prefixed symbols")
2981 : _("%s: uses non-prefixed symbols, but writing file with _-prefixed symbols"),
2982 bfd_archive_filename (ibfd));
2983 bfd_set_error (bfd_error_bad_value);
2984 return FALSE;
2985 }
2986
2987 return TRUE;
2988 }
2989
2990
2991 static enum elf_reloc_type_class
2992 elf_cris_reloc_type_class (rela)
2993 const Elf_Internal_Rela *rela;
2994 {
2995 switch ((int) ELF32_R_TYPE (rela->r_info))
2996 {
2997 case R_CRIS_RELATIVE:
2998 return reloc_class_relative;
2999 case R_CRIS_JUMP_SLOT:
3000 return reloc_class_plt;
3001 case R_CRIS_COPY:
3002 return reloc_class_copy;
3003 default:
3004 return reloc_class_normal;
3005 }
3006 }
3007 \f
3008 #define ELF_ARCH bfd_arch_cris
3009 #define ELF_MACHINE_CODE EM_CRIS
3010 #define ELF_MAXPAGESIZE 0x2000
3011
3012 #define TARGET_LITTLE_SYM bfd_elf32_cris_vec
3013 #define TARGET_LITTLE_NAME "elf32-cris"
3014 #define elf_symbol_leading_char 0
3015
3016 #define elf_info_to_howto_rel NULL
3017 #define elf_info_to_howto cris_info_to_howto_rela
3018 #define elf_backend_relocate_section cris_elf_relocate_section
3019 #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook
3020 #define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook
3021 #define elf_backend_check_relocs cris_elf_check_relocs
3022 #define elf_backend_grok_prstatus cris_elf_grok_prstatus
3023 #define elf_backend_grok_psinfo cris_elf_grok_psinfo
3024
3025 #define elf_backend_can_gc_sections 1
3026 #define elf_backend_can_refcount 1
3027
3028 #define elf_backend_object_p cris_elf_object_p
3029 #define elf_backend_final_write_processing \
3030 cris_elf_final_write_processing
3031 #define bfd_elf32_bfd_print_private_bfd_data \
3032 cris_elf_print_private_bfd_data
3033 #define bfd_elf32_bfd_merge_private_bfd_data \
3034 cris_elf_merge_private_bfd_data
3035
3036 #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup
3037
3038 #define bfd_elf32_bfd_link_hash_table_create \
3039 elf_cris_link_hash_table_create
3040 #define elf_backend_adjust_dynamic_symbol \
3041 elf_cris_adjust_dynamic_symbol
3042 #define elf_backend_size_dynamic_sections \
3043 elf_cris_size_dynamic_sections
3044 #define elf_backend_finish_dynamic_symbol \
3045 elf_cris_finish_dynamic_symbol
3046 #define elf_backend_finish_dynamic_sections \
3047 elf_cris_finish_dynamic_sections
3048 #define elf_backend_create_dynamic_sections \
3049 _bfd_elf_create_dynamic_sections
3050 #define bfd_elf32_bfd_final_link \
3051 _bfd_elf32_gc_common_final_link
3052 #define elf_backend_hide_symbol elf_cris_hide_symbol
3053 #define elf_backend_reloc_type_class elf_cris_reloc_type_class
3054
3055 #define elf_backend_want_got_plt 1
3056 #define elf_backend_plt_readonly 1
3057 #define elf_backend_want_plt_sym 0
3058 #define elf_backend_got_header_size 12
3059
3060 /* Later, we my want to optimize RELA entries into REL entries for dynamic
3061 linking and libraries (if it's a win of any significance). Until then,
3062 take the easy route. */
3063 #define elf_backend_may_use_rel_p 0
3064 #define elf_backend_may_use_rela_p 1
3065 #define elf_backend_rela_normal 1
3066
3067 #include "elf32-target.h"
3068
3069 #define INCLUDED_TARGET_FILE
3070
3071 #undef TARGET_LITTLE_SYM
3072 #undef TARGET_LITTLE_NAME
3073 #undef elf_symbol_leading_char
3074
3075 #define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec
3076 #define TARGET_LITTLE_NAME "elf32-us-cris"
3077 #define elf_symbol_leading_char '_'
3078
3079 #include "elf32-target.h"
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