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* elf-eh-frame.c (_bfd_elf_discard_section_eh_frame): Enable
[deliverable/binutils-gdb.git] / bfd / elf32-cris.c
1 /* CRIS-specific support for 32-bit ELF.
2 Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
3 Contributed by Axis Communications AB.
4 Written by Hans-Peter Nilsson, based on elf32-fr30.c
5 PIC and shlib bits based primarily on elf32-m68k.c and elf32-i386.c.
6
7 This file is part of BFD, the Binary File Descriptor library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/cris.h"
28
29 /* Forward declarations. */
30 static reloc_howto_type * cris_reloc_type_lookup
31 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
32
33 static void cris_info_to_howto_rela
34 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
35
36 static boolean cris_elf_grok_prstatus
37 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
38
39 static boolean cris_elf_grok_psinfo
40 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
41
42 static boolean cris_elf_relocate_section
43 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
44 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
45
46 static bfd_reloc_status_type cris_final_link_relocate
47 PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
48 Elf_Internal_Rela *, bfd_vma));
49
50 static boolean cris_elf_gc_sweep_hook
51 PARAMS ((bfd *, struct bfd_link_info *, asection *,
52 const Elf_Internal_Rela *));
53
54 static asection * cris_elf_gc_mark_hook
55 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
56 struct elf_link_hash_entry *, Elf_Internal_Sym *));
57
58 static boolean cris_elf_object_p PARAMS ((bfd *));
59
60 static void cris_elf_final_write_processing PARAMS ((bfd *, boolean));
61
62 static boolean cris_elf_print_private_bfd_data PARAMS ((bfd *, PTR));
63
64 static boolean cris_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
65
66 struct elf_cris_link_hash_entry;
67 static boolean elf_cris_discard_excess_dso_dynamics
68 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
69 static boolean elf_cris_discard_excess_program_dynamics
70 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
71 static boolean elf_cris_adjust_gotplt_to_got
72 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
73 static boolean elf_cris_try_fold_plt_to_got
74 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
75 static struct bfd_hash_entry *elf_cris_link_hash_newfunc
76 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
77 static struct bfd_link_hash_table *elf_cris_link_hash_table_create
78 PARAMS ((bfd *));
79 static boolean elf_cris_adjust_dynamic_symbol
80 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
81 static boolean cris_elf_check_relocs
82 PARAMS ((bfd *, struct bfd_link_info *, asection *,
83 const Elf_Internal_Rela *));
84
85 static boolean elf_cris_size_dynamic_sections
86 PARAMS ((bfd *, struct bfd_link_info *));
87 static boolean elf_cris_finish_dynamic_symbol
88 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
89 Elf_Internal_Sym *));
90 static boolean elf_cris_finish_dynamic_sections
91 PARAMS ((bfd *, struct bfd_link_info *));
92 static void elf_cris_hide_symbol
93 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *, 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", /* name */
184 false, /* partial_inplace */
185 0x00000000, /* src_mask */
186 0x0000ffff, /* dst_mask */
187 true), /* pcrel_offset */
188
189 /* A 32 bit PC-relative relocation. */
190 HOWTO (R_CRIS_32_PCREL, /* type */
191 0, /* rightshift */
192 2, /* size (0 = byte, 1 = short, 2 = long) */
193 32, /* bitsize */
194 true, /* pc_relative */
195 0, /* bitpos */
196 complain_overflow_bitfield, /* complain_on_overflow */
197 bfd_elf_generic_reloc, /* special_function */
198 "R_CRIS_32", /* name */
199 false, /* partial_inplace */
200 0x00000000, /* src_mask */
201 0xffffffff, /* dst_mask */
202 true), /* pcrel_offset */
203
204 /* GNU extension to record C++ vtable hierarchy. */
205 HOWTO (R_CRIS_GNU_VTINHERIT, /* type */
206 0, /* rightshift */
207 2, /* size (0 = byte, 1 = short, 2 = long) */
208 0, /* bitsize */
209 false, /* pc_relative */
210 0, /* bitpos */
211 complain_overflow_dont, /* complain_on_overflow */
212 NULL, /* special_function */
213 "R_CRIS_GNU_VTINHERIT", /* name */
214 false, /* partial_inplace */
215 0, /* src_mask */
216 0, /* dst_mask */
217 false), /* pcrel_offset */
218
219 /* GNU extension to record C++ vtable member usage. */
220 HOWTO (R_CRIS_GNU_VTENTRY, /* type */
221 0, /* rightshift */
222 2, /* size (0 = byte, 1 = short, 2 = long) */
223 0, /* bitsize */
224 false, /* pc_relative */
225 0, /* bitpos */
226 complain_overflow_dont, /* complain_on_overflow */
227 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
228 "R_CRIS_GNU_VTENTRY", /* name */
229 false, /* partial_inplace */
230 0, /* src_mask */
231 0, /* dst_mask */
232 false), /* pcrel_offset */
233
234 /* This is used only by the dynamic linker. The symbol should exist
235 both in the object being run and in some shared library. The
236 dynamic linker copies the data addressed by the symbol from the
237 shared library into the object, because the object being
238 run has to have the data at some particular address. */
239 HOWTO (R_CRIS_COPY, /* type */
240 0, /* rightshift */
241 2, /* size (0 = byte, 1 = short, 2 = long) */
242 32, /* bitsize */
243 false, /* pc_relative */
244 0, /* bitpos */
245 complain_overflow_bitfield, /* complain_on_overflow */
246 bfd_elf_generic_reloc, /* special_function */
247 "R_CRIS_COPY", /* name */
248 false, /* partial_inplace */
249 0, /* src_mask */
250 0, /* dst_mask */
251 false), /* pcrel_offset */
252
253 /* Like R_CRIS_32, but used when setting global offset table entries. */
254 HOWTO (R_CRIS_GLOB_DAT, /* type */
255 0, /* rightshift */
256 2, /* size (0 = byte, 1 = short, 2 = long) */
257 32, /* bitsize */
258 false, /* pc_relative */
259 0, /* bitpos */
260 complain_overflow_bitfield, /* complain_on_overflow */
261 bfd_elf_generic_reloc, /* special_function */
262 "R_CRIS_GLOB_DAT", /* name */
263 false, /* partial_inplace */
264 0, /* src_mask */
265 0xffffffff, /* dst_mask */
266 false), /* pcrel_offset */
267
268 /* Marks a procedure linkage table entry for a symbol. */
269 HOWTO (R_CRIS_JUMP_SLOT, /* type */
270 0, /* rightshift */
271 2, /* size (0 = byte, 1 = short, 2 = long) */
272 32, /* bitsize */
273 false, /* pc_relative */
274 0, /* bitpos */
275 complain_overflow_bitfield, /* complain_on_overflow */
276 bfd_elf_generic_reloc, /* special_function */
277 "R_CRIS_JUMP_SLOT", /* name */
278 false, /* partial_inplace */
279 0, /* src_mask */
280 0, /* dst_mask */
281 false), /* pcrel_offset */
282
283 /* Used only by the dynamic linker. When the object is run, this
284 longword is set to the load address of the object, plus the
285 addend. */
286 HOWTO (R_CRIS_RELATIVE, /* type */
287 0, /* rightshift */
288 2, /* size (0 = byte, 1 = short, 2 = long) */
289 32, /* bitsize */
290 false, /* pc_relative */
291 0, /* bitpos */
292 complain_overflow_bitfield, /* complain_on_overflow */
293 bfd_elf_generic_reloc, /* special_function */
294 "R_CRIS_RELATIVE", /* name */
295 false, /* partial_inplace */
296 0, /* src_mask */
297 0xffffffff, /* dst_mask */
298 false), /* pcrel_offset */
299
300 /* Like R_CRIS_32, but referring to the GOT table entry for the symbol. */
301 HOWTO (R_CRIS_16_GOT, /* type */
302 0, /* rightshift */
303 1, /* size (0 = byte, 1 = short, 2 = long) */
304 16, /* bitsize */
305 false, /* pc_relative */
306 0, /* bitpos */
307 complain_overflow_bitfield, /* complain_on_overflow */
308 bfd_elf_generic_reloc, /* special_function */
309 "R_CRIS_16_GOT", /* name */
310 false, /* partial_inplace */
311 0, /* src_mask */
312 0xffff, /* dst_mask */
313 false), /* pcrel_offset */
314
315 HOWTO (R_CRIS_32_GOT, /* type */
316 0, /* rightshift */
317 2, /* size (0 = byte, 1 = short, 2 = long) */
318 32, /* bitsize */
319 false, /* pc_relative */
320 0, /* bitpos */
321 complain_overflow_bitfield, /* complain_on_overflow */
322 bfd_elf_generic_reloc, /* special_function */
323 "R_CRIS_32_GOT", /* name */
324 false, /* partial_inplace */
325 0, /* src_mask */
326 0xffffffff, /* dst_mask */
327 false), /* pcrel_offset */
328
329 /* Like R_CRIS_32_GOT, but referring to (and requesting a) PLT part of
330 the GOT table for the symbol. */
331 HOWTO (R_CRIS_16_GOTPLT, /* type */
332 0, /* rightshift */
333 1, /* size (0 = byte, 1 = short, 2 = long) */
334 16, /* bitsize */
335 false, /* pc_relative */
336 0, /* bitpos */
337 complain_overflow_bitfield, /* complain_on_overflow */
338 bfd_elf_generic_reloc, /* special_function */
339 "R_CRIS_16_GOTPLT", /* name */
340 false, /* partial_inplace */
341 0, /* src_mask */
342 0xffff, /* dst_mask */
343 false), /* pcrel_offset */
344
345 HOWTO (R_CRIS_32_GOTPLT, /* type */
346 0, /* rightshift */
347 2, /* size (0 = byte, 1 = short, 2 = long) */
348 32, /* bitsize */
349 false, /* pc_relative */
350 0, /* bitpos */
351 complain_overflow_bitfield, /* complain_on_overflow */
352 bfd_elf_generic_reloc, /* special_function */
353 "R_CRIS_32_GOTPLT", /* name */
354 false, /* partial_inplace */
355 0, /* src_mask */
356 0xffffffff, /* dst_mask */
357 false), /* pcrel_offset */
358
359 /* A 32-bit offset from GOT to (local const) symbol: no GOT entry should
360 be necessary. */
361 HOWTO (R_CRIS_32_GOTREL, /* type */
362 0, /* rightshift */
363 2, /* size (0 = byte, 1 = short, 2 = long) */
364 32, /* bitsize */
365 false, /* pc_relative */
366 0, /* bitpos */
367 complain_overflow_bitfield, /* complain_on_overflow */
368 bfd_elf_generic_reloc, /* special_function */
369 "R_CRIS_32_GOTREL", /* name */
370 false, /* partial_inplace */
371 0, /* src_mask */
372 0xffffffff, /* dst_mask */
373 false), /* pcrel_offset */
374
375 /* A 32-bit offset from GOT to entry for this symbol in PLT and request
376 to create PLT entry for symbol. */
377 HOWTO (R_CRIS_32_PLT_GOTREL, /* type */
378 0, /* rightshift */
379 2, /* size (0 = byte, 1 = short, 2 = long) */
380 32, /* bitsize */
381 false, /* pc_relative */
382 0, /* bitpos */
383 complain_overflow_bitfield, /* complain_on_overflow */
384 bfd_elf_generic_reloc, /* special_function */
385 "R_CRIS_32_PLT_GOTREL", /* name */
386 false, /* partial_inplace */
387 0, /* src_mask */
388 0xffffffff, /* dst_mask */
389 false), /* pcrel_offset */
390
391 /* A 32-bit offset from PC (location after the relocation) + addend to
392 entry for this symbol in PLT and request to create PLT entry for
393 symbol. */
394 HOWTO (R_CRIS_32_PLT_PCREL, /* type */
395 0, /* rightshift */
396 2, /* size (0 = byte, 1 = short, 2 = long) */
397 32, /* bitsize */
398 true, /* pc_relative */
399 0, /* bitpos */
400 complain_overflow_bitfield, /* complain_on_overflow */
401 bfd_elf_generic_reloc, /* special_function */
402 "R_CRIS_32_PLT_PCREL", /* name */
403 false, /* partial_inplace */
404 0, /* src_mask */
405 0xffffffff, /* dst_mask */
406 true) /* pcrel_offset */
407 };
408 \f
409 /* Map BFD reloc types to CRIS ELF reloc types. */
410
411 struct cris_reloc_map
412 {
413 bfd_reloc_code_real_type bfd_reloc_val;
414 unsigned int cris_reloc_val;
415 };
416
417 static const struct cris_reloc_map cris_reloc_map [] =
418 {
419 { BFD_RELOC_NONE, R_CRIS_NONE },
420 { BFD_RELOC_8, R_CRIS_8 },
421 { BFD_RELOC_16, R_CRIS_16 },
422 { BFD_RELOC_32, R_CRIS_32 },
423 { BFD_RELOC_8_PCREL, R_CRIS_8_PCREL },
424 { BFD_RELOC_16_PCREL, R_CRIS_16_PCREL },
425 { BFD_RELOC_32_PCREL, R_CRIS_32_PCREL },
426 { BFD_RELOC_VTABLE_INHERIT, R_CRIS_GNU_VTINHERIT },
427 { BFD_RELOC_VTABLE_ENTRY, R_CRIS_GNU_VTENTRY },
428 { BFD_RELOC_CRIS_COPY, R_CRIS_COPY },
429 { BFD_RELOC_CRIS_GLOB_DAT, R_CRIS_GLOB_DAT },
430 { BFD_RELOC_CRIS_JUMP_SLOT, R_CRIS_JUMP_SLOT },
431 { BFD_RELOC_CRIS_RELATIVE, R_CRIS_RELATIVE },
432 { BFD_RELOC_CRIS_16_GOT, R_CRIS_16_GOT },
433 { BFD_RELOC_CRIS_32_GOT, R_CRIS_32_GOT },
434 { BFD_RELOC_CRIS_16_GOTPLT, R_CRIS_16_GOTPLT },
435 { BFD_RELOC_CRIS_32_GOTPLT, R_CRIS_32_GOTPLT },
436 { BFD_RELOC_CRIS_32_GOTREL, R_CRIS_32_GOTREL },
437 { BFD_RELOC_CRIS_32_PLT_GOTREL, R_CRIS_32_PLT_GOTREL },
438 { BFD_RELOC_CRIS_32_PLT_PCREL, R_CRIS_32_PLT_PCREL }
439 };
440
441 static reloc_howto_type *
442 cris_reloc_type_lookup (abfd, code)
443 bfd * abfd ATTRIBUTE_UNUSED;
444 bfd_reloc_code_real_type code;
445 {
446 unsigned int i;
447
448 for (i = 0; i < sizeof (cris_reloc_map) / sizeof (cris_reloc_map[0]); i++)
449 if (cris_reloc_map [i].bfd_reloc_val == code)
450 return & cris_elf_howto_table [cris_reloc_map[i].cris_reloc_val];
451
452 return NULL;
453 }
454
455 /* Set the howto pointer for an CRIS ELF reloc. */
456
457 static void
458 cris_info_to_howto_rela (abfd, cache_ptr, dst)
459 bfd * abfd ATTRIBUTE_UNUSED;
460 arelent * cache_ptr;
461 Elf32_Internal_Rela * dst;
462 {
463 unsigned int r_type;
464
465 r_type = ELF32_R_TYPE (dst->r_info);
466 BFD_ASSERT (r_type < (unsigned int) R_CRIS_max);
467 cache_ptr->howto = & cris_elf_howto_table [r_type];
468 }
469 \f
470 /* Support for core dump NOTE sections. */
471
472 static boolean
473 cris_elf_grok_prstatus (abfd, note)
474 bfd *abfd;
475 Elf_Internal_Note *note;
476 {
477 int offset;
478 size_t raw_size;
479
480 switch (note->descsz)
481 {
482 default:
483 return false;
484
485 case 214: /* Linux/CRIS */
486 /* pr_cursig */
487 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
488
489 /* pr_pid */
490 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 22);
491
492 /* pr_reg */
493 offset = 70;
494 raw_size = 140;
495
496 break;
497 }
498
499 /* Make a ".reg/999" section. */
500 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
501 raw_size, note->descpos + offset);
502 }
503
504 static boolean
505 cris_elf_grok_psinfo (abfd, note)
506 bfd *abfd;
507 Elf_Internal_Note *note;
508 {
509 switch (note->descsz)
510 {
511 default:
512 return false;
513
514 case 124: /* Linux/CRIS elf_prpsinfo */
515 elf_tdata (abfd)->core_program
516 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
517 elf_tdata (abfd)->core_command
518 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
519 }
520
521 /* Note that for some reason, a spurious space is tacked
522 onto the end of the args in some (at least one anyway)
523 implementations, so strip it off if it exists. */
524
525 {
526 char *command = elf_tdata (abfd)->core_command;
527 int n = strlen (command);
528
529 if (0 < n && command[n - 1] == ' ')
530 command[n - 1] = '\0';
531 }
532
533 return true;
534 }
535 \f
536 /* The name of the dynamic interpreter. This is put in the .interp
537 section. */
538
539 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
540
541 /* The size in bytes of an entry in the procedure linkage table. */
542
543 #define PLT_ENTRY_SIZE 20
544
545 /* The first entry in an absolute procedure linkage table looks like this. */
546
547 static const bfd_byte elf_cris_plt0_entry[PLT_ENTRY_SIZE] =
548 {
549 0xfc, 0xe1,
550 0x7e, 0x7e, /* push mof. */
551 0x7f, 0x0d, /* (dip [pc+]) */
552 0, 0, 0, 0, /* Replaced with address of .got + 4. */
553 0x30, 0x7a, /* move [...],mof */
554 0x7f, 0x0d, /* (dip [pc+]) */
555 0, 0, 0, 0, /* Replaced with address of .got + 8. */
556 0x30, 0x09, /* jump [...] */
557 };
558
559 /* Subsequent entries in an absolute procedure linkage table look like
560 this. */
561
562 static const bfd_byte elf_cris_plt_entry[PLT_ENTRY_SIZE] =
563 {
564 0x7f, 0x0d, /* (dip [pc+]) */
565 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */
566 0x30, 0x09, /* jump [...] */
567 0x3f, 0x7e, /* move [pc+],mof */
568 0, 0, 0, 0, /* Replaced with offset into relocation table. */
569 0x2f, 0xfe, /* add.d [pc+],pc */
570 0xec, 0xff,
571 0xff, 0xff /* Replaced with offset to start of .plt. */
572 };
573
574 /* The first entry in a PIC procedure linkage table looks like this. */
575
576 static const bfd_byte elf_cris_pic_plt0_entry[PLT_ENTRY_SIZE] =
577 {
578 0xfc, 0xe1, 0x7e, 0x7e, /* push mof */
579 0x04, 0x01, 0x30, 0x7a, /* move [r0+4],mof */
580 0x08, 0x01, 0x30, 0x09, /* jump [r0+8] */
581 0, 0, 0, 0, 0, 0, 0, 0, /* Pad out to 20 bytes. */
582 };
583
584 /* Subsequent entries in a PIC procedure linkage table look like this. */
585
586 static const bfd_byte elf_cris_pic_plt_entry[PLT_ENTRY_SIZE] =
587 {
588 0x6f, 0x0d, /* (bdap [pc+].d,r0) */
589 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */
590 0x30, 0x09, /* jump [...] */
591 0x3f, 0x7e, /* move [pc+],mof */
592 0, 0, 0, 0, /* Replaced with offset into relocation table. */
593 0x2f, 0xfe, /* add.d [pc+],pc */
594 0xec, 0xff, /* Replaced with offset to start of .plt. */
595 0xff, 0xff
596 };
597 \f
598 /* We copy elf32-m68k.c and elf32-i386.c for the basic linker hash bits
599 (and most other PIC/shlib stuff). Check that we don't drift away
600 without reason.
601
602 The CRIS linker, like the m68k and i386 linkers (and probably the rest
603 too) needs to keep track of the number of relocs that it decides to
604 copy in check_relocs for each symbol. This is so that it can discard
605 PC relative relocs if it doesn't need them when linking with
606 -Bsymbolic. We store the information in a field extending the regular
607 ELF linker hash table. */
608
609 /* This structure keeps track of the number of PC relative relocs we have
610 copied for a given symbol. */
611
612 struct elf_cris_pcrel_relocs_copied
613 {
614 /* Next section. */
615 struct elf_cris_pcrel_relocs_copied *next;
616 /* A section in dynobj. */
617 asection *section;
618 /* Number of relocs copied in this section. */
619 bfd_size_type count;
620 };
621
622 /* CRIS ELF linker hash entry. */
623
624 struct elf_cris_link_hash_entry
625 {
626 struct elf_link_hash_entry root;
627
628 /* Number of PC relative relocs copied for this symbol. */
629 struct elf_cris_pcrel_relocs_copied *pcrel_relocs_copied;
630
631 /* The GOTPLT references are CRIS-specific; the goal is to avoid having
632 both a general GOT and a PLT-specific GOT entry for the same symbol,
633 when it is referenced both as a function and as a function pointer.
634
635 Number of GOTPLT references for a function. */
636 bfd_signed_vma gotplt_refcount;
637
638 /* Actual GOTPLT index for this symbol, if applicable, or zero if not
639 (zero is never used as an index). FIXME: We should be able to fold
640 this with gotplt_refcount in a union, like the got and plt unions in
641 elf_link_hash_entry. */
642 bfd_size_type gotplt_offset;
643 };
644
645 /* CRIS ELF linker hash table. */
646
647 struct elf_cris_link_hash_table
648 {
649 struct elf_link_hash_table root;
650
651 /* We can't use the PLT offset and calculate to get the GOTPLT offset,
652 since we try and avoid creating GOTPLT:s when there's already a GOT.
653 Instead, we keep and update the next available index here. */
654 bfd_size_type next_gotplt_entry;
655 };
656
657 /* Traverse a CRIS ELF linker hash table. */
658
659 #define elf_cris_link_hash_traverse(table, func, info) \
660 (elf_link_hash_traverse \
661 (&(table)->root, \
662 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
663 (info)))
664
665 /* Get the CRIS ELF linker hash table from a link_info structure. */
666
667 #define elf_cris_hash_table(p) \
668 ((struct elf_cris_link_hash_table *) (p)->hash)
669
670 /* Create an entry in a CRIS ELF linker hash table. */
671
672 static struct bfd_hash_entry *
673 elf_cris_link_hash_newfunc (entry, table, string)
674 struct bfd_hash_entry *entry;
675 struct bfd_hash_table *table;
676 const char *string;
677 {
678 struct elf_cris_link_hash_entry *ret =
679 (struct elf_cris_link_hash_entry *) entry;
680
681 /* Allocate the structure if it has not already been allocated by a
682 subclass. */
683 if (ret == (struct elf_cris_link_hash_entry *) NULL)
684 ret = ((struct elf_cris_link_hash_entry *)
685 bfd_hash_allocate (table,
686 sizeof (struct elf_cris_link_hash_entry)));
687 if (ret == (struct elf_cris_link_hash_entry *) NULL)
688 return (struct bfd_hash_entry *) ret;
689
690 /* Call the allocation method of the superclass. */
691 ret = ((struct elf_cris_link_hash_entry *)
692 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
693 table, string));
694 if (ret != (struct elf_cris_link_hash_entry *) NULL)
695 {
696 ret->pcrel_relocs_copied = NULL;
697 ret->gotplt_refcount = 0;
698 ret->gotplt_offset = 0;
699 }
700
701 return (struct bfd_hash_entry *) ret;
702 }
703
704 /* Create a CRIS ELF linker hash table. */
705
706 static struct bfd_link_hash_table *
707 elf_cris_link_hash_table_create (abfd)
708 bfd *abfd;
709 {
710 struct elf_cris_link_hash_table *ret;
711 bfd_size_type amt = sizeof (struct elf_cris_link_hash_table);
712
713 ret = ((struct elf_cris_link_hash_table *) bfd_alloc (abfd, amt));
714 if (ret == (struct elf_cris_link_hash_table *) NULL)
715 return NULL;
716
717 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
718 elf_cris_link_hash_newfunc))
719 {
720 bfd_release (abfd, ret);
721 return NULL;
722 }
723
724 /* Initialize to skip over the first three entries in the gotplt; they
725 are used for run-time symbol evaluation. */
726 ret->next_gotplt_entry = 12;
727
728 return &ret->root.root;
729 }
730 \f
731 /* Perform a single relocation. By default we use the standard BFD
732 routines, with a few tweaks. */
733
734 static bfd_reloc_status_type
735 cris_final_link_relocate (howto, input_bfd, input_section, contents, rel,
736 relocation)
737 reloc_howto_type * howto;
738 bfd * input_bfd;
739 asection * input_section;
740 bfd_byte * contents;
741 Elf_Internal_Rela * rel;
742 bfd_vma relocation;
743 {
744 bfd_reloc_status_type r;
745
746 /* PC-relative relocations are relative to the position *after*
747 the reloc. Note that for R_CRIS_8_PCREL the adjustment is
748 not a single byte, since PC must be 16-bit-aligned. */
749 switch (ELF32_R_TYPE (rel->r_info))
750 {
751 /* Check that the 16-bit GOT relocs are positive. */
752 case R_CRIS_16_GOTPLT:
753 case R_CRIS_16_GOT:
754 if ((bfd_signed_vma) relocation < 0)
755 return bfd_reloc_overflow;
756 break;
757
758 case R_CRIS_32_PLT_PCREL:
759 case R_CRIS_32_PCREL:
760 relocation -= 2;
761 /* Fall through. */
762 case R_CRIS_8_PCREL:
763 case R_CRIS_16_PCREL:
764 relocation -= 2;
765 break;
766
767 default:
768 break;
769 }
770
771 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
772 contents, rel->r_offset,
773 relocation, rel->r_addend);
774 return r;
775 }
776 \f
777 /* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was
778 copied, for further comments. */
779
780 static boolean
781 cris_elf_relocate_section (output_bfd, info, input_bfd, input_section,
782 contents, relocs, local_syms, local_sections)
783 bfd * output_bfd ATTRIBUTE_UNUSED;
784 struct bfd_link_info * info;
785 bfd * input_bfd;
786 asection * input_section;
787 bfd_byte * contents;
788 Elf_Internal_Rela * relocs;
789 Elf_Internal_Sym * local_syms;
790 asection ** local_sections;
791 {
792 bfd *dynobj;
793 Elf_Internal_Shdr * symtab_hdr;
794 struct elf_link_hash_entry ** sym_hashes;
795 bfd_vma *local_got_offsets;
796 asection *sgot;
797 asection *splt;
798 asection *sreloc;
799 Elf_Internal_Rela * rel;
800 Elf_Internal_Rela * relend;
801
802 dynobj = elf_hash_table (info)->dynobj;
803 local_got_offsets = elf_local_got_offsets (input_bfd);
804 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
805 sym_hashes = elf_sym_hashes (input_bfd);
806 relend = relocs + input_section->reloc_count;
807
808 /* It seems this can happen with erroneous or unsupported input (mixing
809 a.out and elf in an archive, for example.) */
810 if (sym_hashes == NULL)
811 return false;
812
813 sgot = NULL;
814 splt = NULL;
815 sreloc = NULL;
816
817 if (dynobj != NULL)
818 {
819 splt = bfd_get_section_by_name (dynobj, ".plt");
820 sgot = bfd_get_section_by_name (dynobj, ".got");
821 }
822
823 for (rel = relocs; rel < relend; rel ++)
824 {
825 reloc_howto_type * howto;
826 unsigned long r_symndx;
827 Elf_Internal_Sym * sym;
828 asection * sec;
829 struct elf_link_hash_entry * h;
830 bfd_vma relocation;
831 bfd_reloc_status_type r;
832 const char * symname = NULL;
833 int r_type;
834
835 r_type = ELF32_R_TYPE (rel->r_info);
836
837 if ( r_type == R_CRIS_GNU_VTINHERIT
838 || r_type == R_CRIS_GNU_VTENTRY)
839 continue;
840
841 r_symndx = ELF32_R_SYM (rel->r_info);
842
843 if (info->relocateable)
844 {
845 /* This is a relocateable link. We don't have to change
846 anything, unless the reloc is against a section symbol,
847 in which case we have to adjust according to where the
848 section symbol winds up in the output section. */
849 if (r_symndx < symtab_hdr->sh_info)
850 {
851 sym = local_syms + r_symndx;
852
853 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
854 {
855 sec = local_sections [r_symndx];
856 rel->r_addend += sec->output_offset + sym->st_value;
857 }
858 }
859
860 continue;
861 }
862
863 /* This is a final link. */
864 howto = cris_elf_howto_table + r_type;
865 h = NULL;
866 sym = NULL;
867 sec = NULL;
868
869 if (r_symndx < symtab_hdr->sh_info)
870 {
871 sym = local_syms + r_symndx;
872 sec = local_sections [r_symndx];
873 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
874
875 symname = (bfd_elf_string_from_elf_section
876 (input_bfd, symtab_hdr->sh_link, sym->st_name));
877 if (symname == NULL)
878 symname = bfd_section_name (input_bfd, sec);
879 }
880 else
881 {
882 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
883
884 while (h->root.type == bfd_link_hash_indirect
885 || h->root.type == bfd_link_hash_warning)
886 h = (struct elf_link_hash_entry *) h->root.u.i.link;
887
888 symname = h->root.root.string;
889
890 if (h->root.type == bfd_link_hash_defined
891 || h->root.type == bfd_link_hash_defweak)
892 {
893 sec = h->root.u.def.section;
894
895 /* Perhaps we should detect the cases that
896 sec->output_section is expected to be NULL like i386 and
897 m68k, but apparently (and according to elfxx-ia64.c) all
898 valid cases are where the symbol is defined in a shared
899 object which we link dynamically against. This includes
900 PLT relocs for which we've created a PLT entry and other
901 relocs for which we're prepared to create dynamic
902 relocations.
903
904 For now, new situations cause us to just err when
905 sec->output_offset is NULL but the object with the symbol
906 is *not* dynamically linked against. Thus this will
907 automatically remind us so we can see if there are other
908 valid cases we need to revisit. */
909 if ((sec->output_section == NULL
910 && (sec->owner->flags & DYNAMIC) != 0)
911
912 /* Here follow the cases where the relocation value must
913 be zero (or when further handling is simplified when
914 zero). I can't claim to understand the various
915 conditions and they weren't described in the files
916 where I copied them from (elf32-m68k.c and
917 elf32-i386.c), but let's mention examples of where
918 they happen. FIXME: Perhaps define and use a
919 dynamic_symbol_p function like ia64.
920
921 - When creating a shared library, we can have an
922 ordinary relocation for a symbol defined in a shared
923 library (perhaps the one we create). We then make
924 the relocation value zero, as the value seen now will
925 be added into the relocation addend in this shared
926 library, but must be handled only at dynamic-link
927 time. FIXME: Not sure this example covers the
928 h->elf_link_hash_flags test, though it's there in
929 other targets. */
930 || (info->shared
931 && ((! info->symbolic && h->dynindx != -1)
932 || (h->elf_link_hash_flags
933 & ELF_LINK_HASH_DEF_REGULAR) == 0)
934 && (input_section->flags & SEC_ALLOC) != 0
935 && (r_type == R_CRIS_8
936 || r_type == R_CRIS_16
937 || r_type == R_CRIS_32
938 || r_type == R_CRIS_8_PCREL
939 || r_type == R_CRIS_16_PCREL
940 || r_type == R_CRIS_32_PCREL)))
941 relocation = 0;
942 else if (sec->output_section != NULL)
943 relocation = (h->root.u.def.value
944 + sec->output_section->vma
945 + sec->output_offset);
946 else
947 {
948 (*_bfd_error_handler)
949 (_("%s: unresolvable relocation %s against symbol `%s' from %s section"),
950 bfd_archive_filename (input_bfd),
951 cris_elf_howto_table[r_type].name,
952 symname,
953 bfd_get_section_name (input_bfd, input_section));
954 bfd_set_error (bfd_error_bad_value);
955 return false;
956 }
957 }
958 else if (h->root.type == bfd_link_hash_undefweak)
959 relocation = 0;
960 else if (info->shared
961 && (!info->symbolic || info->allow_shlib_undefined)
962 && !info->no_undefined
963 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
964 relocation = 0;
965 else
966 {
967 if (!(info->callbacks->undefined_symbol
968 (info, symname, input_bfd,
969 input_section, rel->r_offset,
970 (!info->shared || info->no_undefined
971 || ELF_ST_VISIBILITY (h->other)))))
972 return false;
973 relocation = 0;
974 }
975 }
976
977 switch (r_type)
978 {
979 case R_CRIS_16_GOTPLT:
980 case R_CRIS_32_GOTPLT:
981 /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT,
982 but we require a PLT, and the PLT handling will take care of
983 filling in the PLT-specific GOT entry. For the GOT offset,
984 calculate it as we do when filling it in for the .got.plt
985 section. If we don't have a PLT, punt to GOT handling. */
986 if (h != NULL
987 && ((struct elf_cris_link_hash_entry *) h)->gotplt_offset != 0)
988 {
989 asection *sgotplt
990 = bfd_get_section_by_name (dynobj, ".got.plt");
991 bfd_vma got_offset;
992
993 BFD_ASSERT (h->dynindx != -1);
994 BFD_ASSERT (sgotplt != NULL);
995
996 got_offset
997 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset;
998
999 relocation = got_offset;
1000 break;
1001 }
1002
1003 /* We didn't make a PLT entry for this symbol. Maybe everything is
1004 folded into the GOT. Other than folding, this happens when
1005 statically linking PIC code, or when using -Bsymbolic. Check
1006 that we instead have a GOT entry as done for us by
1007 elf_cris_adjust_dynamic_symbol, and drop through into the
1008 ordinary GOT cases. */
1009 if (h != NULL && h->got.offset == (bfd_vma) -1)
1010 {
1011 (*_bfd_error_handler)
1012 (_("%s: No PLT nor GOT for relocation %s against symbol `%s' from %s section"),
1013 bfd_archive_filename (input_bfd),
1014 cris_elf_howto_table[r_type].name,
1015 symname[0] != '\0' ? symname : _("[whose name is lost]"),
1016 bfd_get_section_name (input_bfd, input_section));
1017
1018 /* FIXME: Perhaps blaming input is not the right thing to
1019 do; this is probably an internal error. But it is true
1020 that we didn't like that particular input. */
1021 bfd_set_error (bfd_error_bad_value);
1022 return false;
1023 }
1024 /* Fall through. */
1025
1026 /* The size of the actual relocation is not used here; we only
1027 fill in the GOT table here. */
1028 case R_CRIS_16_GOT:
1029 case R_CRIS_32_GOT:
1030 {
1031 bfd_vma off;
1032
1033 /* Note that despite using RELA relocations, the .got contents
1034 is always filled in with the link-relative relocation
1035 value; the addend. */
1036
1037 if (h != NULL)
1038 {
1039 off = h->got.offset;
1040 BFD_ASSERT (off != (bfd_vma) -1);
1041
1042 if (!elf_hash_table (info)->dynamic_sections_created
1043 || (! info->shared && h->dynindx == -1)
1044 || (info->shared
1045 && (info->symbolic || h->dynindx == -1)
1046 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1047 {
1048 /* This wasn't checked above for ! info->shared, but
1049 must hold there if we get here; the symbol must not
1050 be used in, or defined by a DSO. (Note that
1051 checking for ELF_LINK_HASH_DEF_REGULAR doesn't
1052 catch all cases.) */
1053 BFD_ASSERT (info->shared
1054 || (h->elf_link_hash_flags
1055 & (ELF_LINK_HASH_REF_DYNAMIC
1056 | ELF_LINK_HASH_DEF_DYNAMIC)) == 0);
1057
1058 /* This is actually a static link, or it is a
1059 -Bsymbolic link and the symbol is defined
1060 locally, or the symbol was forced to be local
1061 because of a version file, or we're not creating a
1062 dynamic object and the symbol isn't referred to by
1063 a dynamic object. We must initialize
1064 this entry in the global offset table. Since
1065 the offset must always be a multiple of 4, we
1066 use the least significant bit to record whether
1067 we have initialized it already.
1068
1069 When doing a dynamic link, we create a .rela.got
1070 relocation entry to initialize the value. This
1071 is done in the finish_dynamic_symbol routine. */
1072 if ((off & 1) != 0)
1073 off &= ~1;
1074 else
1075 {
1076 bfd_put_32 (output_bfd, relocation,
1077 sgot->contents + off);
1078 h->got.offset |= 1;
1079 }
1080 }
1081 }
1082 else
1083 {
1084 BFD_ASSERT (local_got_offsets != NULL
1085 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1086
1087 off = local_got_offsets[r_symndx];
1088
1089 /* The offset must always be a multiple of 4. We use
1090 the least significant bit to record whether we have
1091 already generated the necessary reloc. */
1092 if ((off & 1) != 0)
1093 off &= ~1;
1094 else
1095 {
1096 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1097
1098 if (info->shared)
1099 {
1100 asection *srelgot;
1101 Elf_Internal_Rela outrel;
1102
1103 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1104 BFD_ASSERT (srelgot != NULL);
1105
1106 outrel.r_offset = (sgot->output_section->vma
1107 + sgot->output_offset
1108 + off);
1109 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1110 outrel.r_addend = relocation;
1111 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1112 (((Elf32_External_Rela *)
1113 srelgot->contents)
1114 + srelgot->reloc_count));
1115 ++srelgot->reloc_count;
1116 }
1117
1118 local_got_offsets[r_symndx] |= 1;
1119 }
1120 }
1121
1122 relocation = sgot->output_offset + off;
1123 if (rel->r_addend != 0)
1124 {
1125 /* We can't do anything for a relocation which is against
1126 a symbol *plus offset*. GOT holds relocations for
1127 symbols. Make this an error; the compiler isn't
1128 allowed to pass us these kinds of things. */
1129 if (h == NULL)
1130 (*_bfd_error_handler)
1131 (_("%s: relocation %s with non-zero addend %d against local symbol from %s section"),
1132 bfd_archive_filename (input_bfd),
1133 cris_elf_howto_table[r_type].name,
1134 rel->r_addend,
1135 bfd_get_section_name (input_bfd, input_section));
1136 else
1137 (*_bfd_error_handler)
1138 (_("%s: relocation %s with non-zero addend %d against symbol `%s' from %s section"),
1139 bfd_archive_filename (input_bfd),
1140 cris_elf_howto_table[r_type].name,
1141 rel->r_addend,
1142 symname[0] != '\0' ? symname : _("[whose name is lost]"),
1143 bfd_get_section_name (input_bfd, input_section));
1144
1145 bfd_set_error (bfd_error_bad_value);
1146 return false;
1147 }
1148 }
1149 break;
1150
1151 case R_CRIS_32_GOTREL:
1152 /* This relocation must only be performed against local symbols. */
1153 if (h != NULL)
1154 {
1155 (*_bfd_error_handler)
1156 (_("%s: relocation %s is not allowed for global symbol: `%s' from %s section"),
1157 bfd_archive_filename (input_bfd),
1158 cris_elf_howto_table[r_type].name,
1159 symname,
1160 bfd_get_section_name (input_bfd, input_section));
1161 bfd_set_error (bfd_error_bad_value);
1162 return false;
1163 }
1164
1165 /* This can happen if we get a link error with the input ELF
1166 variant mismatching the output variant. Emit an error so
1167 it's noticed if it happens elsewhere. */
1168 if (sgot == NULL)
1169 {
1170 (*_bfd_error_handler)
1171 (_("%s: relocation %s in section %s with no GOT created"),
1172 bfd_archive_filename (input_bfd),
1173 cris_elf_howto_table[r_type].name,
1174 bfd_get_section_name (input_bfd, input_section));
1175 bfd_set_error (bfd_error_bad_value);
1176 return false;
1177 }
1178
1179 /* This relocation is like a PC-relative one, except the
1180 reference point is the location of GOT. Note that
1181 sgot->output_offset is not involved in this calculation. We
1182 always want the start of entire .got section, not the
1183 position after the reserved header. */
1184 relocation -= sgot->output_section->vma;
1185 break;
1186
1187 case R_CRIS_32_PLT_PCREL:
1188 /* Relocation is to the entry for this symbol in the
1189 procedure linkage table. */
1190
1191 /* Resolve a PLT_PCREL reloc against a local symbol directly,
1192 without using the procedure linkage table. */
1193 if (h == NULL)
1194 break;
1195
1196 if (h->plt.offset == (bfd_vma) -1
1197 || splt == NULL)
1198 {
1199 /* We didn't make a PLT entry for this symbol. This
1200 happens when statically linking PIC code, or when
1201 using -Bsymbolic. */
1202 break;
1203 }
1204
1205 relocation = (splt->output_section->vma
1206 + splt->output_offset
1207 + h->plt.offset);
1208 break;
1209
1210 case R_CRIS_32_PLT_GOTREL:
1211 /* Like R_CRIS_32_PLT_PCREL, but the reference point is the
1212 start of the .got section. See also comment at
1213 R_CRIS_32_GOT. */
1214 relocation -= sgot->output_section->vma;
1215
1216 /* Resolve a PLT_GOTREL reloc against a local symbol directly,
1217 without using the procedure linkage table. */
1218 if (h == NULL)
1219 break;
1220
1221 if (h->plt.offset == (bfd_vma) -1
1222 || splt == NULL)
1223 {
1224 /* We didn't make a PLT entry for this symbol. This
1225 happens when statically linking PIC code, or when
1226 using -Bsymbolic. */
1227 break;
1228 }
1229
1230 relocation = (splt->output_section->vma
1231 + splt->output_offset
1232 + h->plt.offset
1233 - sgot->output_section->vma);
1234 break;
1235
1236 case R_CRIS_8_PCREL:
1237 case R_CRIS_16_PCREL:
1238 case R_CRIS_32_PCREL:
1239 /* If the symbol was local, we need no shlib-specific handling. */
1240 if (h == NULL)
1241 break;
1242
1243 /* Fall through. */
1244 case R_CRIS_8:
1245 case R_CRIS_16:
1246 case R_CRIS_32:
1247 if (info->shared
1248 && r_symndx != 0
1249 && (input_section->flags & SEC_ALLOC) != 0
1250 && ((r_type != R_CRIS_8_PCREL
1251 && r_type != R_CRIS_16_PCREL
1252 && r_type != R_CRIS_32_PCREL)
1253 || (!info->symbolic
1254 || (h->elf_link_hash_flags
1255 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1256 {
1257 Elf_Internal_Rela outrel;
1258 boolean skip, relocate;
1259
1260 /* When generating a shared object, these relocations
1261 are copied into the output file to be resolved at run
1262 time. */
1263
1264 if (sreloc == NULL)
1265 {
1266 const char *name;
1267
1268 name = (bfd_elf_string_from_elf_section
1269 (input_bfd,
1270 elf_elfheader (input_bfd)->e_shstrndx,
1271 elf_section_data (input_section)->rel_hdr.sh_name));
1272 if (name == NULL)
1273 return false;
1274
1275 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1276 && strcmp (bfd_get_section_name (input_bfd,
1277 input_section),
1278 name + 5) == 0);
1279
1280 sreloc = bfd_get_section_by_name (dynobj, name);
1281
1282 /* That section should have been created in
1283 cris_elf_check_relocs, but that function will not be
1284 called for objects which fail in
1285 cris_elf_merge_private_bfd_data. */
1286 if (sreloc == NULL)
1287 {
1288 (*_bfd_error_handler)
1289 (_("%s: Internal inconsistency; no relocation section %s"),
1290 bfd_archive_filename (input_bfd),
1291 name);
1292
1293 bfd_set_error (bfd_error_bad_value);
1294 return false;
1295 }
1296 }
1297
1298 skip = false;
1299 relocate = false;
1300
1301 outrel.r_offset =
1302 _bfd_elf_section_offset (output_bfd, info, input_section,
1303 rel->r_offset);
1304 if (outrel.r_offset == (bfd_vma) -1)
1305 skip = true;
1306 else if (outrel.r_offset == (bfd_vma) -2)
1307 skip = true, relocate = true;
1308 outrel.r_offset += (input_section->output_section->vma
1309 + input_section->output_offset);
1310
1311 if (skip)
1312 memset (&outrel, 0, sizeof outrel);
1313 /* h->dynindx may be -1 if the symbol was marked to
1314 become local. */
1315 else if (h != NULL
1316 && ((! info->symbolic && h->dynindx != -1)
1317 || (h->elf_link_hash_flags
1318 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1319 {
1320 BFD_ASSERT (h->dynindx != -1);
1321 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1322 outrel.r_addend = relocation + rel->r_addend;
1323 }
1324 else
1325 {
1326 if (r_type == R_CRIS_32)
1327 {
1328 relocate = true;
1329 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1330 outrel.r_addend = relocation + rel->r_addend;
1331 }
1332 else
1333 {
1334 long indx;
1335
1336 if (h == NULL)
1337 sec = local_sections[r_symndx];
1338 else
1339 {
1340 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1341 || (h->root.type
1342 == bfd_link_hash_defweak));
1343 sec = h->root.u.def.section;
1344 }
1345 if (sec != NULL && bfd_is_abs_section (sec))
1346 indx = 0;
1347 else if (sec == NULL || sec->owner == NULL)
1348 {
1349 bfd_set_error (bfd_error_bad_value);
1350 return false;
1351 }
1352 else
1353 {
1354 asection *osec;
1355
1356 osec = sec->output_section;
1357 indx = elf_section_data (osec)->dynindx;
1358 BFD_ASSERT (indx > 0);
1359 }
1360
1361 outrel.r_info = ELF32_R_INFO (indx, r_type);
1362 outrel.r_addend = relocation + rel->r_addend;
1363 }
1364 }
1365
1366 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1367 (((Elf32_External_Rela *)
1368 sreloc->contents)
1369 + sreloc->reloc_count));
1370 ++sreloc->reloc_count;
1371
1372 /* This reloc will be computed at runtime, so there's no
1373 need to do anything now, except for R_CRIS_32 relocations
1374 that have been turned into R_CRIS_RELATIVE. */
1375 if (!relocate)
1376 continue;
1377 }
1378
1379 break;
1380 }
1381
1382 r = cris_final_link_relocate (howto, input_bfd, input_section,
1383 contents, rel, relocation);
1384
1385 if (r != bfd_reloc_ok)
1386 {
1387 const char * msg = (const char *) NULL;
1388
1389 switch (r)
1390 {
1391 case bfd_reloc_overflow:
1392 r = info->callbacks->reloc_overflow
1393 (info, symname, howto->name, (bfd_vma) 0,
1394 input_bfd, input_section, rel->r_offset);
1395 break;
1396
1397 case bfd_reloc_undefined:
1398 r = info->callbacks->undefined_symbol
1399 (info, symname, input_bfd, input_section, rel->r_offset,
1400 true);
1401 break;
1402
1403 case bfd_reloc_outofrange:
1404 msg = _("internal error: out of range error");
1405 break;
1406
1407 case bfd_reloc_notsupported:
1408 msg = _("internal error: unsupported relocation error");
1409 break;
1410
1411 case bfd_reloc_dangerous:
1412 msg = _("internal error: dangerous relocation");
1413 break;
1414
1415 default:
1416 msg = _("internal error: unknown error");
1417 break;
1418 }
1419
1420 if (msg)
1421 r = info->callbacks->warning
1422 (info, msg, symname, input_bfd, input_section, rel->r_offset);
1423
1424 if (! r)
1425 return false;
1426 }
1427 }
1428
1429 return true;
1430 }
1431 \f
1432 /* Finish up dynamic symbol handling. We set the contents of various
1433 dynamic sections here. */
1434
1435 static boolean
1436 elf_cris_finish_dynamic_symbol (output_bfd, info, h, sym)
1437 bfd *output_bfd;
1438 struct bfd_link_info *info;
1439 struct elf_link_hash_entry *h;
1440 Elf_Internal_Sym *sym;
1441 {
1442 bfd *dynobj;
1443 int plt_off1 = 2, plt_off2 = 10, plt_off3 = 16;
1444
1445 dynobj = elf_hash_table (info)->dynobj;
1446
1447 if (h->plt.offset != (bfd_vma) -1)
1448 {
1449 asection *splt;
1450 asection *sgotplt;
1451 asection *sgot;
1452 asection *srela;
1453 bfd_vma got_base;
1454
1455 bfd_vma gotplt_offset
1456 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset;
1457 Elf_Internal_Rela rela;
1458 boolean has_gotplt = gotplt_offset != 0;
1459
1460 /* Get the index in the procedure linkage table which
1461 corresponds to this symbol. This is the index of this symbol
1462 in all the symbols for which we are making plt entries. The
1463 first entry in the procedure linkage table is reserved. */
1464 /* We have to count backwards here, and the result is only valid as
1465 an index into .got.plt and its relocations. FIXME: Constants... */
1466 bfd_vma gotplt_index = gotplt_offset/4 - 3;
1467
1468 /* Get the offset into the .got table of the entry that corresponds
1469 to this function. Note that we embed knowledge that "incoming"
1470 .got goes after .got.plt in the output without padding (pointer
1471 aligned). However, that knowledge is present in several other
1472 places too, here and in elflink.h at least. */
1473 bfd_vma got_offset
1474 = (has_gotplt
1475 ? gotplt_offset
1476 : h->got.offset + elf_cris_hash_table(info)->next_gotplt_entry);
1477
1478 /* This symbol has an entry in the procedure linkage table. Set it
1479 up. */
1480
1481 BFD_ASSERT (h->dynindx != -1);
1482
1483 splt = bfd_get_section_by_name (dynobj, ".plt");
1484 sgot = bfd_get_section_by_name (dynobj, ".got");
1485 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1486 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1487 BFD_ASSERT (splt != NULL && sgotplt != NULL
1488 && (! has_gotplt || srela != NULL));
1489
1490 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1491
1492 /* Fill in the entry in the procedure linkage table. */
1493 if (! info->shared)
1494 {
1495 memcpy (splt->contents + h->plt.offset, elf_cris_plt_entry,
1496 PLT_ENTRY_SIZE);
1497
1498 /* We need to enter the absolute address of the GOT entry here. */
1499 bfd_put_32 (output_bfd, got_base + got_offset,
1500 splt->contents + h->plt.offset + plt_off1);
1501 }
1502 else
1503 {
1504 memcpy (splt->contents + h->plt.offset, elf_cris_pic_plt_entry,
1505 PLT_ENTRY_SIZE);
1506 bfd_put_32 (output_bfd, got_offset,
1507 splt->contents + h->plt.offset + plt_off1);
1508 }
1509
1510 /* Fill in the plt entry and make a relocation, if this is a "real"
1511 PLT entry. */
1512 if (has_gotplt)
1513 {
1514 /* Fill in the offset into the reloc table. */
1515 bfd_put_32 (output_bfd,
1516 gotplt_index * sizeof (Elf32_External_Rela),
1517 splt->contents + h->plt.offset + plt_off2);
1518
1519 /* Fill in the offset to the first PLT entry, where to "jump". */
1520 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3 + 4),
1521 splt->contents + h->plt.offset + plt_off3);
1522
1523 /* Fill in the entry in the global offset table with the address of
1524 the relocating stub. */
1525 bfd_put_32 (output_bfd,
1526 (splt->output_section->vma
1527 + splt->output_offset
1528 + h->plt.offset
1529 + 8),
1530 sgotplt->contents + got_offset);
1531
1532 /* Fill in the entry in the .rela.plt section. */
1533 rela.r_offset = (sgotplt->output_section->vma
1534 + sgotplt->output_offset
1535 + got_offset);
1536 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_JUMP_SLOT);
1537 rela.r_addend = 0;
1538 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1539 ((Elf32_External_Rela *) srela->contents
1540 + gotplt_index));
1541 }
1542
1543 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1544 {
1545 /* Mark the symbol as undefined, rather than as defined in
1546 the .plt section. Leave the value alone. */
1547 sym->st_shndx = SHN_UNDEF;
1548
1549 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't
1550 know whether resetting the value is significant; if it really
1551 is, rather than a quirk or bug in the sparc port, then I
1552 believe we'd see this elsewhere. */
1553 /* If the symbol is weak, we do need to clear the value.
1554 Otherwise, the PLT entry would provide a definition for
1555 the symbol even if the symbol wasn't defined anywhere,
1556 and so the symbol would never be NULL. */
1557 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
1558 == 0)
1559 sym->st_value = 0;
1560 }
1561 }
1562
1563 /* We don't emit .got relocs for symbols that aren't in the
1564 dynamic-symbols table for an ordinary program. */
1565 if (h->got.offset != (bfd_vma) -1
1566 && (info->shared || h->dynindx != -1))
1567 {
1568 asection *sgot;
1569 asection *srela;
1570 Elf_Internal_Rela rela;
1571 bfd_byte *where;
1572
1573 /* This symbol has an entry in the global offset table. Set it up. */
1574
1575 sgot = bfd_get_section_by_name (dynobj, ".got");
1576 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1577 BFD_ASSERT (sgot != NULL && srela != NULL);
1578
1579 rela.r_offset = (sgot->output_section->vma
1580 + sgot->output_offset
1581 + (h->got.offset &~ (bfd_vma) 1));
1582
1583 /* If this is a static link, or it is a -Bsymbolic link and the
1584 symbol is defined locally or was forced to be local because
1585 of a version file, we just want to emit a RELATIVE reloc.
1586 The entry in the global offset table will already have been
1587 initialized in the relocate_section function. */
1588 where = sgot->contents + (h->got.offset &~ (bfd_vma) 1);
1589 if (! elf_hash_table (info)->dynamic_sections_created
1590 || (info->shared
1591 && (info->symbolic || h->dynindx == -1)
1592 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1593 {
1594 rela.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1595 rela.r_addend = bfd_get_signed_32 (output_bfd, where);
1596 }
1597 else
1598 {
1599 bfd_put_32 (output_bfd, (bfd_vma) 0, where);
1600 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_GLOB_DAT);
1601 rela.r_addend = 0;
1602 }
1603
1604 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1605 ((Elf32_External_Rela *) srela->contents
1606 + srela->reloc_count));
1607 ++srela->reloc_count;
1608 }
1609
1610 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1611 {
1612 asection *s;
1613 Elf_Internal_Rela rela;
1614
1615 /* This symbol needs a copy reloc. Set it up. */
1616
1617 BFD_ASSERT (h->dynindx != -1
1618 && (h->root.type == bfd_link_hash_defined
1619 || h->root.type == bfd_link_hash_defweak));
1620
1621 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1622 ".rela.bss");
1623 BFD_ASSERT (s != NULL);
1624
1625 rela.r_offset = (h->root.u.def.value
1626 + h->root.u.def.section->output_section->vma
1627 + h->root.u.def.section->output_offset);
1628 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_COPY);
1629 rela.r_addend = 0;
1630 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1631 ((Elf32_External_Rela *) s->contents
1632 + s->reloc_count));
1633 ++s->reloc_count;
1634 }
1635
1636 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1637 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1638 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1639 sym->st_shndx = SHN_ABS;
1640
1641 return true;
1642 }
1643 \f
1644 /* Finish up the dynamic sections. */
1645
1646 static boolean
1647 elf_cris_finish_dynamic_sections (output_bfd, info)
1648 bfd *output_bfd;
1649 struct bfd_link_info *info;
1650 {
1651 bfd *dynobj;
1652 asection *sgot;
1653 asection *sdyn;
1654
1655 dynobj = elf_hash_table (info)->dynobj;
1656
1657 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1658 BFD_ASSERT (sgot != NULL);
1659 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1660
1661 if (elf_hash_table (info)->dynamic_sections_created)
1662 {
1663 asection *splt;
1664 Elf32_External_Dyn *dyncon, *dynconend;
1665
1666 splt = bfd_get_section_by_name (dynobj, ".plt");
1667 BFD_ASSERT (splt != NULL && sdyn != NULL);
1668
1669 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1670 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1671 for (; dyncon < dynconend; dyncon++)
1672 {
1673 Elf_Internal_Dyn dyn;
1674 asection *s;
1675
1676 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1677
1678 switch (dyn.d_tag)
1679 {
1680 default:
1681 break;
1682
1683 case DT_PLTGOT:
1684 s = bfd_get_section_by_name (output_bfd, ".got");
1685 BFD_ASSERT (s != NULL);
1686 dyn.d_un.d_ptr = s->vma;
1687 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1688 break;
1689
1690 case DT_JMPREL:
1691 /* Yes, we *can* have a .plt and no .plt.rela, for instance
1692 if all symbols are found in the .got (not .got.plt). */
1693 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1694 dyn.d_un.d_ptr = s != NULL ? s->vma : 0;
1695 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1696 break;
1697
1698 case DT_PLTRELSZ:
1699 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1700 if (s == NULL)
1701 dyn.d_un.d_val = 0;
1702 else if (s->_cooked_size != 0)
1703 dyn.d_un.d_val = s->_cooked_size;
1704 else
1705 dyn.d_un.d_val = s->_raw_size;
1706 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1707 break;
1708
1709 case DT_RELASZ:
1710 /* The procedure linkage table relocs (DT_JMPREL) should
1711 not be included in the overall relocs (DT_RELA).
1712 Therefore, we override the DT_RELASZ entry here to
1713 make it not include the JMPREL relocs. Since the
1714 linker script arranges for .rela.plt to follow all
1715 other relocation sections, we don't have to worry
1716 about changing the DT_RELA entry. */
1717 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1718 if (s != NULL)
1719 {
1720 if (s->_cooked_size != 0)
1721 dyn.d_un.d_val -= s->_cooked_size;
1722 else
1723 dyn.d_un.d_val -= s->_raw_size;
1724 }
1725 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1726 break;
1727 }
1728 }
1729
1730 /* Fill in the first entry in the procedure linkage table. */
1731 if (splt->_raw_size > 0)
1732 {
1733 if (info->shared)
1734 memcpy (splt->contents, elf_cris_pic_plt0_entry, PLT_ENTRY_SIZE);
1735 else
1736 {
1737 memcpy (splt->contents, elf_cris_plt0_entry, PLT_ENTRY_SIZE);
1738 bfd_put_32 (output_bfd,
1739 sgot->output_section->vma + sgot->output_offset + 4,
1740 splt->contents + 6);
1741 bfd_put_32 (output_bfd,
1742 sgot->output_section->vma + sgot->output_offset + 8,
1743 splt->contents + 14);
1744
1745 elf_section_data (splt->output_section)->this_hdr.sh_entsize
1746 = PLT_ENTRY_SIZE;
1747 }
1748 }
1749 }
1750
1751 /* Fill in the first three entries in the global offset table. */
1752 if (sgot->_raw_size > 0)
1753 {
1754 if (sdyn == NULL)
1755 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1756 else
1757 bfd_put_32 (output_bfd,
1758 sdyn->output_section->vma + sdyn->output_offset,
1759 sgot->contents);
1760 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
1761 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
1762 }
1763
1764 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1765
1766 return true;
1767 }
1768 \f
1769 /* Return the section that should be marked against GC for a given
1770 relocation. */
1771
1772 static asection *
1773 cris_elf_gc_mark_hook (abfd, info, rel, h, sym)
1774 bfd * abfd;
1775 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1776 Elf_Internal_Rela * rel;
1777 struct elf_link_hash_entry * h;
1778 Elf_Internal_Sym * sym;
1779 {
1780 if (h != NULL)
1781 {
1782 switch (ELF32_R_TYPE (rel->r_info))
1783 {
1784 case R_CRIS_GNU_VTINHERIT:
1785 case R_CRIS_GNU_VTENTRY:
1786 break;
1787
1788 default:
1789 switch (h->root.type)
1790 {
1791 case bfd_link_hash_defined:
1792 case bfd_link_hash_defweak:
1793 return h->root.u.def.section;
1794
1795 case bfd_link_hash_common:
1796 return h->root.u.c.p->section;
1797
1798 default:
1799 break;
1800 }
1801 }
1802 }
1803 else
1804 {
1805 return bfd_section_from_elf_index (abfd, sym->st_shndx);
1806 }
1807
1808 return NULL;
1809 }
1810
1811 /* Update the got entry reference counts for the section being removed. */
1812
1813 static boolean
1814 cris_elf_gc_sweep_hook (abfd, info, sec, relocs)
1815 bfd * abfd ATTRIBUTE_UNUSED;
1816 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1817 asection * sec ATTRIBUTE_UNUSED;
1818 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
1819 {
1820 Elf_Internal_Shdr *symtab_hdr;
1821 struct elf_link_hash_entry **sym_hashes;
1822 bfd_signed_vma *local_got_refcounts;
1823 const Elf_Internal_Rela *rel, *relend;
1824 unsigned long r_symndx;
1825 struct elf_link_hash_entry *h;
1826 bfd *dynobj;
1827 asection *sgot;
1828 asection *srelgot;
1829
1830 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1831 sym_hashes = elf_sym_hashes (abfd);
1832 local_got_refcounts = elf_local_got_refcounts (abfd);
1833
1834 dynobj = elf_hash_table (info)->dynobj;
1835 if (dynobj == NULL)
1836 return true;
1837
1838 sgot = bfd_get_section_by_name (dynobj, ".got");
1839 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1840
1841 relend = relocs + sec->reloc_count;
1842 for (rel = relocs; rel < relend; rel++)
1843 {
1844 switch (ELF32_R_TYPE (rel->r_info))
1845 {
1846 case R_CRIS_16_GOT:
1847 case R_CRIS_32_GOT:
1848 r_symndx = ELF32_R_SYM (rel->r_info);
1849 if (r_symndx >= symtab_hdr->sh_info)
1850 {
1851 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1852 if (h->got.refcount > 0)
1853 {
1854 --h->got.refcount;
1855 if (h->got.refcount == 0)
1856 {
1857 /* We don't need the .got entry any more. */
1858 sgot->_raw_size -= 4;
1859 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
1860 }
1861 }
1862 break;
1863 }
1864
1865 local_got_reloc:
1866 if (local_got_refcounts != NULL)
1867 {
1868 if (local_got_refcounts[r_symndx] > 0)
1869 {
1870 --local_got_refcounts[r_symndx];
1871 if (local_got_refcounts[r_symndx] == 0)
1872 {
1873 /* We don't need the .got entry any more. */
1874 sgot->_raw_size -= 4;
1875 if (info->shared)
1876 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
1877 }
1878 }
1879 }
1880 break;
1881
1882 case R_CRIS_16_GOTPLT:
1883 case R_CRIS_32_GOTPLT:
1884 /* For local symbols, treat these like GOT relocs. */
1885 r_symndx = ELF32_R_SYM (rel->r_info);
1886 if (r_symndx < symtab_hdr->sh_info)
1887 goto local_got_reloc;
1888
1889 case R_CRIS_32_PLT_GOTREL:
1890 /* FIXME: We don't garbage-collect away the .got section. */
1891 if (local_got_refcounts != NULL)
1892 local_got_refcounts[-1]--;
1893 /* Fall through. */
1894
1895 case R_CRIS_8_PCREL:
1896 case R_CRIS_16_PCREL:
1897 case R_CRIS_32_PCREL:
1898 case R_CRIS_32_PLT_PCREL:
1899 r_symndx = ELF32_R_SYM (rel->r_info);
1900 if (r_symndx >= symtab_hdr->sh_info)
1901 {
1902 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1903 if (h->plt.refcount > 0)
1904 --h->plt.refcount;
1905 }
1906 break;
1907
1908 default:
1909 break;
1910 }
1911 }
1912
1913 return true;
1914 }
1915
1916 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1917 entry but we found we will not create any. Called when we find we will
1918 not have any PLT for this symbol, by for example
1919 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link,
1920 or elf_cris_size_dynamic_sections if no dynamic sections will be
1921 created (we're only linking static objects). */
1922
1923 static boolean
1924 elf_cris_adjust_gotplt_to_got (h, p)
1925 struct elf_cris_link_hash_entry *h;
1926 PTR p;
1927 {
1928 struct bfd_link_info *info = (struct bfd_link_info *) p;
1929 bfd *dynobj = elf_hash_table (info)->dynobj;
1930
1931 BFD_ASSERT (dynobj != NULL);
1932
1933 /* If nobody wanted a GOTPLT with this symbol, we're done. */
1934 if (h->gotplt_refcount <= 0)
1935 return true;
1936
1937 if (h->root.got.refcount > 0)
1938 {
1939 /* There's a GOT entry for this symbol. Just adjust the refcount.
1940 Probably not necessary at this stage, but keeping it accurate
1941 helps avoiding surprises later. */
1942 h->root.got.refcount += h->gotplt_refcount;
1943 h->gotplt_refcount = -1;
1944 }
1945 else
1946 {
1947 /* No GOT entry for this symbol. We need to create one. */
1948 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
1949 asection *srelgot
1950 = bfd_get_section_by_name (dynobj, ".rela.got");
1951
1952 /* Put an accurate refcount there. */
1953 h->root.got.refcount = h->gotplt_refcount;
1954
1955 h->gotplt_refcount = -1;
1956
1957 /* We always have a .got section when there are dynamic
1958 relocs. */
1959 BFD_ASSERT (sgot != NULL /* Surely have .got section. */);
1960
1961 /* We might have had a PLT but with no GOT entry and
1962 further no GOT reloc section at all needed before.
1963 Add it. */
1964 if (srelgot == NULL)
1965 {
1966 srelgot = bfd_make_section (dynobj, ".rela.got");
1967
1968 if (srelgot == NULL
1969 || !bfd_set_section_flags (dynobj, srelgot,
1970 (SEC_ALLOC
1971 | SEC_LOAD
1972 | SEC_HAS_CONTENTS
1973 | SEC_IN_MEMORY
1974 | SEC_LINKER_CREATED
1975 | SEC_READONLY))
1976 || !bfd_set_section_alignment (dynobj, srelgot, 2))
1977 return false;
1978 }
1979
1980 /* Allocate space in the .got section. */
1981 sgot->_raw_size += 4;
1982
1983 /* Allocate relocation space. */
1984 srelgot->_raw_size += sizeof (Elf32_External_Rela);
1985 }
1986
1987 return true;
1988 }
1989
1990 /* Try to fold PLT entries with GOT entries. There are two cases when we
1991 want to do this:
1992
1993 - When all PLT references are GOTPLT references, and there are GOT
1994 references. We don't have to generate a PLT at all.
1995
1996 - When there are both (ordinary) PLT references and GOT references.
1997 We want to make the PLT reference use the ordinary GOT entry rather
1998 than a run-time dynamically resolved GOTPLT entry (since the GOT
1999 entry will have to be resolved at startup anyway).
2000
2001 Though the latter case is handled when room for the PLT is allocated,
2002 not here.
2003
2004 Note that this function is called before symbols are forced local by
2005 version scripts. The differing cases are handled by
2006 elf_cris_hide_symbol. */
2007
2008 static boolean
2009 elf_cris_try_fold_plt_to_got (h, p)
2010 struct elf_cris_link_hash_entry *h;
2011 PTR p;
2012 {
2013 struct bfd_link_info *info = (struct bfd_link_info *) p;
2014
2015 /* If there are no GOT references for this symbol, we can't fold any
2016 other reference so there's nothing to do. Likewise if there are no
2017 PLT references; GOTPLT references included. */
2018 if (h->root.got.refcount <= 0 || h->root.plt.refcount <= 0)
2019 return true;
2020
2021 /* GOTPLT relocs are supposed to be included into the PLT refcount. */
2022 BFD_ASSERT (h->gotplt_refcount <= h->root.plt.refcount);
2023
2024 if (h->gotplt_refcount == h->root.plt.refcount)
2025 {
2026 /* The only PLT references are GOTPLT references, and there are GOT
2027 references. Convert PLT to GOT references. */
2028 if (! elf_cris_adjust_gotplt_to_got (h, info))
2029 return false;
2030
2031 /* Clear the PLT references, so no PLT will be created. */
2032 h->root.plt.offset = (bfd_vma) -1;
2033 }
2034
2035 return true;
2036 }
2037
2038 /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc
2039 to use a GOT entry (and create one) rather than requiring a GOTPLT
2040 entry. */
2041
2042 static void
2043 elf_cris_hide_symbol (info, h, force_local)
2044 struct bfd_link_info *info;
2045 struct elf_link_hash_entry *h;
2046 boolean force_local;
2047 {
2048 elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info);
2049
2050 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
2051 }
2052
2053 /* Adjust a symbol defined by a dynamic object and referenced by a
2054 regular object. The current definition is in some section of the
2055 dynamic object, but we're not including those sections. We have to
2056 change the definition to something the rest of the link can
2057 understand. */
2058
2059 static boolean
2060 elf_cris_adjust_dynamic_symbol (info, h)
2061 struct bfd_link_info *info;
2062 struct elf_link_hash_entry *h;
2063 {
2064 bfd *dynobj;
2065 asection *s;
2066 unsigned int power_of_two;
2067
2068 dynobj = elf_hash_table (info)->dynobj;
2069
2070 /* Make sure we know what is going on here. */
2071 BFD_ASSERT (dynobj != NULL
2072 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
2073 || h->weakdef != NULL
2074 || ((h->elf_link_hash_flags
2075 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2076 && (h->elf_link_hash_flags
2077 & ELF_LINK_HASH_REF_REGULAR) != 0
2078 && (h->elf_link_hash_flags
2079 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
2080
2081 /* If this is a function, put it in the procedure linkage table. We
2082 will fill in the contents of the procedure linkage table later,
2083 when we know the address of the .got section. */
2084 if (h->type == STT_FUNC
2085 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
2086 {
2087 if (! info->shared
2088 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
2089 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
2090 /* We must always create the plt entry if it was referenced by a
2091 PLT relocation. In this case we already recorded it as a
2092 dynamic symbol. */
2093 /* FIXME: m68k and i386 differ here, for unclear reasons. */
2094 && h->dynindx == -1)
2095 {
2096 /* This case can occur if we saw a PLT reloc in an input file,
2097 but the symbol was never referred to by a dynamic object. In
2098 such a case, we don't actually need to build a procedure
2099 linkage table, and we can just do a PC reloc instead, or
2100 change a .got.plt index to a .got index for GOTPLT relocs. */
2101 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
2102 h->plt.offset = (bfd_vma) -1;
2103
2104 return
2105 elf_cris_adjust_gotplt_to_got ((struct
2106 elf_cris_link_hash_entry *) h,
2107 info);
2108 }
2109
2110 /* If there are only GOT references and GOTPLT references to this
2111 PLT entry, get rid of the PLT. */
2112 if (! elf_cris_try_fold_plt_to_got ((struct elf_cris_link_hash_entry *)
2113 h, info))
2114 return false;
2115
2116 /* GC or folding may have rendered this entry unused. */
2117 if (h->plt.refcount <= 0)
2118 {
2119 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
2120 h->plt.offset = (bfd_vma) -1;
2121 return true;
2122 }
2123
2124 /* Make sure this symbol is output as a dynamic symbol. */
2125 if (h->dynindx == -1)
2126 {
2127 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
2128 return false;
2129 }
2130
2131 s = bfd_get_section_by_name (dynobj, ".plt");
2132 BFD_ASSERT (s != NULL);
2133
2134 /* If this is the first .plt entry, make room for the special
2135 first entry. */
2136 if (s->_raw_size == 0)
2137 s->_raw_size += PLT_ENTRY_SIZE;
2138
2139 /* If this symbol is not defined in a regular file, and we are
2140 not generating a shared library, then set the symbol to this
2141 location in the .plt. This is required to make function
2142 pointers compare as equal between the normal executable and
2143 the shared library. */
2144 if (!info->shared
2145 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2146 {
2147 h->root.u.def.section = s;
2148 h->root.u.def.value = s->_raw_size;
2149 }
2150
2151 /* If there's already a GOT entry, use that, not a .got.plt. A
2152 GOT field still has a reference count when we get here; it's
2153 not yet changed to an offset. */
2154 if (h->got.refcount > 0)
2155 {
2156 h->got.refcount += h->plt.refcount;
2157
2158 /* Mark the PLT offset to use the GOT entry by setting the low
2159 bit in the plt offset; it is always a multiple of
2160 pointer-size. */
2161 BFD_ASSERT ((s->_raw_size & 3) == 0);
2162
2163 /* Change the PLT refcount to an offset. */
2164 h->plt.offset = s->_raw_size;
2165
2166 /* By not setting gotplt_offset (i.e. it remains at 0), we signal
2167 that the got entry should be used instead. */
2168 BFD_ASSERT (((struct elf_cris_link_hash_entry *)
2169 h)->gotplt_offset == 0);
2170
2171 /* Make room for this entry. */
2172 s->_raw_size += PLT_ENTRY_SIZE;
2173
2174 return true;
2175 }
2176
2177 /* No GOT reference for this symbol; prepare for an ordinary PLT. */
2178 h->plt.offset = s->_raw_size;
2179
2180 /* Make room for this entry. */
2181 s->_raw_size += PLT_ENTRY_SIZE;
2182
2183 /* We also need to make an entry in the .got.plt section, which
2184 will be placed in the .got section by the linker script. */
2185 ((struct elf_cris_link_hash_entry *) h)->gotplt_offset
2186 = elf_cris_hash_table (info)->next_gotplt_entry;
2187 elf_cris_hash_table (info)->next_gotplt_entry += 4;
2188
2189 s = bfd_get_section_by_name (dynobj, ".got.plt");
2190 BFD_ASSERT (s != NULL);
2191 s->_raw_size += 4;
2192
2193 /* We also need to make an entry in the .rela.plt section. */
2194
2195 s = bfd_get_section_by_name (dynobj, ".rela.plt");
2196 BFD_ASSERT (s != NULL);
2197 s->_raw_size += sizeof (Elf32_External_Rela);
2198
2199 return true;
2200 }
2201
2202 /* Reinitialize the plt offset now that it is not used as a reference
2203 count any more. */
2204 h->plt.offset = (bfd_vma) -1;
2205
2206 /* If this is a weak symbol, and there is a real definition, the
2207 processor independent code will have arranged for us to see the
2208 real definition first, and we can just use the same value. */
2209 if (h->weakdef != NULL)
2210 {
2211 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
2212 || h->weakdef->root.type == bfd_link_hash_defweak);
2213 h->root.u.def.section = h->weakdef->root.u.def.section;
2214 h->root.u.def.value = h->weakdef->root.u.def.value;
2215 return true;
2216 }
2217
2218 /* This is a reference to a symbol defined by a dynamic object which
2219 is not a function. */
2220
2221 /* If we are creating a shared library, we must presume that the
2222 only references to the symbol are via the global offset table.
2223 For such cases we need not do anything here; the relocations will
2224 be handled correctly by relocate_section. */
2225 if (info->shared)
2226 return true;
2227
2228 /* If there are no references to this symbol that do not use the
2229 GOT, we don't need to generate a copy reloc. */
2230 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
2231 return true;
2232
2233 /* We must allocate the symbol in our .dynbss section, which will
2234 become part of the .bss section of the executable. There will be
2235 an entry for this symbol in the .dynsym section. The dynamic
2236 object will contain position independent code, so all references
2237 from the dynamic object to this symbol will go through the global
2238 offset table. The dynamic linker will use the .dynsym entry to
2239 determine the address it must put in the global offset table, so
2240 both the dynamic object and the regular object will refer to the
2241 same memory location for the variable. */
2242
2243 s = bfd_get_section_by_name (dynobj, ".dynbss");
2244 BFD_ASSERT (s != NULL);
2245
2246 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to
2247 copy the initial value out of the dynamic object and into the
2248 runtime process image. We need to remember the offset into the
2249 .rela.bss section we are going to use. */
2250 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2251 {
2252 asection *srel;
2253
2254 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
2255 BFD_ASSERT (srel != NULL);
2256 srel->_raw_size += sizeof (Elf32_External_Rela);
2257 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
2258 }
2259
2260 /* Historic precedent: m68k and i386 allow max 8-byte alignment for the
2261 thing to copy; so do we. */
2262
2263 /* We need to figure out the alignment required for this symbol. I
2264 have no idea how ELF linkers handle this. */
2265 power_of_two = bfd_log2 (h->size);
2266 if (power_of_two > 3)
2267 power_of_two = 3;
2268
2269 /* Apply the required alignment. */
2270 s->_raw_size = BFD_ALIGN (s->_raw_size,
2271 (bfd_size_type) (1 << power_of_two));
2272 if (power_of_two > bfd_get_section_alignment (dynobj, s))
2273 {
2274 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
2275 return false;
2276 }
2277
2278 /* Define the symbol as being at this point in the section. */
2279 h->root.u.def.section = s;
2280 h->root.u.def.value = s->_raw_size;
2281
2282 /* Increment the section size to make room for the symbol. */
2283 s->_raw_size += h->size;
2284
2285 return true;
2286 }
2287
2288 /* Look through the relocs for a section during the first phase. */
2289
2290 static boolean
2291 cris_elf_check_relocs (abfd, info, sec, relocs)
2292 bfd *abfd;
2293 struct bfd_link_info *info;
2294 asection *sec;
2295 const Elf_Internal_Rela *relocs;
2296 {
2297 bfd *dynobj;
2298 Elf_Internal_Shdr *symtab_hdr;
2299 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
2300 bfd_signed_vma *local_got_refcounts;
2301 const Elf_Internal_Rela *rel;
2302 const Elf_Internal_Rela *rel_end;
2303 asection *sgot;
2304 asection *srelgot;
2305 asection *sreloc;
2306
2307 if (info->relocateable)
2308 return true;
2309
2310 dynobj = elf_hash_table (info)->dynobj;
2311 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2312 sym_hashes = elf_sym_hashes (abfd);
2313 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
2314 local_got_refcounts = elf_local_got_refcounts (abfd);
2315
2316 sgot = NULL;
2317 srelgot = NULL;
2318 sreloc = NULL;
2319
2320 if (!elf_bad_symtab (abfd))
2321 sym_hashes_end -= symtab_hdr->sh_info;
2322
2323 rel_end = relocs + sec->reloc_count;
2324 for (rel = relocs; rel < rel_end; rel++)
2325 {
2326 struct elf_link_hash_entry *h;
2327 unsigned long r_symndx;
2328 enum elf_cris_reloc_type r_type;
2329
2330 r_symndx = ELF32_R_SYM (rel->r_info);
2331 if (r_symndx < symtab_hdr->sh_info)
2332 h = NULL;
2333 else
2334 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2335
2336 r_type = ELF32_R_TYPE (rel->r_info);
2337
2338 /* Some relocs require linker-created sections; we need to hang them
2339 on the first input bfd we found that contained dynamic relocs. */
2340 switch (r_type)
2341 {
2342 case R_CRIS_16_GOT:
2343 case R_CRIS_32_GOT:
2344 case R_CRIS_32_GOTREL:
2345 case R_CRIS_32_PLT_GOTREL:
2346 case R_CRIS_32_PLT_PCREL:
2347 case R_CRIS_16_GOTPLT:
2348 case R_CRIS_32_GOTPLT:
2349 if (dynobj == NULL)
2350 {
2351 elf_hash_table (info)->dynobj = dynobj = abfd;
2352
2353 /* Create the .got section, so we can assume it's always
2354 present whenever there's a dynobj. */
2355 if (!_bfd_elf_create_got_section (dynobj, info))
2356 return false;
2357 }
2358 break;
2359
2360 default:
2361 break;
2362 }
2363
2364 /* Some relocs require a global offset table (but perhaps not a
2365 specific GOT entry). */
2366 switch (r_type)
2367 {
2368 case R_CRIS_16_GOT:
2369 case R_CRIS_32_GOT:
2370 case R_CRIS_32_GOTREL:
2371 case R_CRIS_32_PLT_GOTREL:
2372 if (sgot == NULL)
2373 sgot = bfd_get_section_by_name (dynobj, ".got");
2374
2375 if (local_got_refcounts == NULL)
2376 {
2377 bfd_size_type amt;
2378
2379 /* We use index local_got_refcounts[-1] to count all
2380 GOT-relative relocations that do not have explicit
2381 GOT entries. */
2382 amt = symtab_hdr->sh_info + 1;
2383 amt *= sizeof (bfd_signed_vma);
2384 local_got_refcounts = ((bfd_signed_vma *) bfd_zalloc (abfd, amt));
2385 if (local_got_refcounts == NULL)
2386 return false;
2387
2388 local_got_refcounts++;
2389 elf_local_got_refcounts (abfd) = local_got_refcounts;
2390 }
2391 break;
2392
2393 default:
2394 break;
2395 }
2396
2397 switch (r_type)
2398 {
2399 case R_CRIS_16_GOTPLT:
2400 case R_CRIS_32_GOTPLT:
2401 /* Mark that we need a GOT entry if the PLT entry (and its GOT
2402 entry) is eliminated. We can only do this for a non-local
2403 symbol. */
2404 if (h != NULL)
2405 {
2406 ((struct elf_cris_link_hash_entry *) h)->gotplt_refcount++;
2407 goto handle_gotplt_reloc;
2408 }
2409 /* If h is NULL then this is a local symbol, and we must make a
2410 GOT entry for it, so handle it like a GOT reloc. */
2411 /* Fall through. */
2412
2413 case R_CRIS_16_GOT:
2414 case R_CRIS_32_GOT:
2415 /* This symbol requires a global offset table entry. */
2416
2417 if (srelgot == NULL
2418 && (h != NULL || info->shared))
2419 {
2420 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2421 if (srelgot == NULL)
2422 {
2423 srelgot = bfd_make_section (dynobj, ".rela.got");
2424 if (srelgot == NULL
2425 || !bfd_set_section_flags (dynobj, srelgot,
2426 (SEC_ALLOC
2427 | SEC_LOAD
2428 | SEC_HAS_CONTENTS
2429 | SEC_IN_MEMORY
2430 | SEC_LINKER_CREATED
2431 | SEC_READONLY))
2432 || !bfd_set_section_alignment (dynobj, srelgot, 2))
2433 return false;
2434 }
2435 }
2436
2437 if (h != NULL)
2438 {
2439 if (h->got.refcount == 0)
2440 {
2441 /* Make sure this symbol is output as a dynamic symbol. */
2442 if (h->dynindx == -1)
2443 {
2444 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
2445 return false;
2446 }
2447
2448 /* Allocate space in the .got section. */
2449 sgot->_raw_size += 4;
2450 /* Allocate relocation space. */
2451 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2452 }
2453 h->got.refcount++;
2454 }
2455 else
2456 {
2457 /* This is a global offset table entry for a local symbol. */
2458 if (local_got_refcounts[r_symndx] == 0)
2459 {
2460 sgot->_raw_size += 4;
2461 if (info->shared)
2462 {
2463 /* If we are generating a shared object, we need to
2464 output a R_CRIS_RELATIVE reloc so that the dynamic
2465 linker can adjust this GOT entry. */
2466 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2467 }
2468 }
2469 local_got_refcounts[r_symndx]++;
2470 }
2471 break;
2472
2473 case R_CRIS_32_GOTREL:
2474 /* This reference requires a global offset table.
2475 FIXME: The actual refcount isn't used currently; the .got
2476 section can't be removed if there were any references in the
2477 input. */
2478 local_got_refcounts[-1]++;
2479 break;
2480
2481 handle_gotplt_reloc:
2482
2483 case R_CRIS_32_PLT_GOTREL:
2484 /* This reference requires a global offset table. */
2485 local_got_refcounts[-1]++;
2486 /* Fall through. */
2487
2488 case R_CRIS_32_PLT_PCREL:
2489 /* This symbol requires a procedure linkage table entry. We
2490 actually build the entry in adjust_dynamic_symbol,
2491 because this might be a case of linking PIC code which is
2492 never referenced by a dynamic object, in which case we
2493 don't need to generate a procedure linkage table entry
2494 after all. */
2495
2496 /* If this is a local symbol, we resolve it directly without
2497 creating a procedure linkage table entry. */
2498 if (h == NULL)
2499 continue;
2500
2501 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
2502 h->plt.refcount++;
2503 break;
2504
2505 case R_CRIS_8:
2506 case R_CRIS_16:
2507 case R_CRIS_32:
2508 /* Let's help debug shared library creation. Any of these
2509 relocs can be used in shared libs, but pages containing them
2510 cannot be shared. Don't warn for sections we don't care
2511 about, such as debug sections or non-constant sections. We
2512 can't help tables of (global) function pointers, for example,
2513 though they must be emitted in a data section to avoid having
2514 impure text sections. */
2515 if (info->shared
2516 && (sec->flags & SEC_ALLOC) != 0
2517 && (sec->flags & SEC_READONLY) != 0)
2518 {
2519 /* FIXME: How do we make this optionally a warning only? */
2520 (*_bfd_error_handler)
2521 (_("%s, section %s:\n relocation %s should not be used in a shared object; recompile with -fPIC"),
2522 bfd_archive_filename (abfd),
2523 sec->name,
2524 cris_elf_howto_table[r_type].name);
2525 }
2526 /* Fall through. */
2527
2528 case R_CRIS_8_PCREL:
2529 case R_CRIS_16_PCREL:
2530 case R_CRIS_32_PCREL:
2531 if (h != NULL)
2532 {
2533 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
2534
2535 /* Make sure a plt entry is created for this symbol if it
2536 turns out to be a function defined by a dynamic object. */
2537 h->plt.refcount++;
2538 }
2539
2540 /* If we are creating a shared library and this is not a local
2541 symbol, we need to copy the reloc into the shared library.
2542 However when linking with -Bsymbolic and this is a global
2543 symbol which is defined in an object we are including in the
2544 link (i.e., DEF_REGULAR is set), then we can resolve the
2545 reloc directly. At this point we have not seen all the input
2546 files, so it is possible that DEF_REGULAR is not set now but
2547 will be set later (it is never cleared). In case of a weak
2548 definition, DEF_REGULAR may be cleared later by a strong
2549 definition in a shared library. We account for that
2550 possibility below by storing information in the relocs_copied
2551 field of the hash table entry. A similar situation occurs
2552 when creating shared libraries and symbol visibility changes
2553 render the symbol local. */
2554
2555 /* No need to do anything if we're not creating a shared object. */
2556 if (! info->shared)
2557 break;
2558
2559 /* We don't need to handle relocs into sections not going into
2560 the "real" output. */
2561 if ((sec->flags & SEC_ALLOC) == 0)
2562 break;
2563
2564 /* We can only eliminate PC-relative relocs. */
2565 if (r_type == R_CRIS_8_PCREL
2566 || r_type == R_CRIS_16_PCREL
2567 || r_type == R_CRIS_32_PCREL)
2568 {
2569 /* If the symbol is local, then we can eliminate the reloc. */
2570 if (h == NULL)
2571 break;
2572
2573 /* If this is with -Bsymbolic and the symbol isn't weak, and
2574 is defined by an ordinary object (the ones we include in
2575 this shared library) then we can also eliminate the
2576 reloc. See comment above for more eliminable cases which
2577 we can't identify at this time. */
2578 if (info->symbolic
2579 && h->root.type != bfd_link_hash_defweak
2580 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
2581 break;
2582 }
2583
2584 /* We create a reloc section in dynobj and make room for this
2585 reloc. */
2586 if (sreloc == NULL)
2587 {
2588 const char *name;
2589
2590 name = (bfd_elf_string_from_elf_section
2591 (abfd,
2592 elf_elfheader (abfd)->e_shstrndx,
2593 elf_section_data (sec)->rel_hdr.sh_name));
2594 if (name == NULL)
2595 return false;
2596
2597 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
2598 && strcmp (bfd_get_section_name (abfd, sec),
2599 name + 5) == 0);
2600
2601 sreloc = bfd_get_section_by_name (dynobj, name);
2602 if (sreloc == NULL)
2603 {
2604 sreloc = bfd_make_section (dynobj, name);
2605 if (sreloc == NULL
2606 || !bfd_set_section_flags (dynobj, sreloc,
2607 (SEC_ALLOC
2608 | SEC_LOAD
2609 | SEC_HAS_CONTENTS
2610 | SEC_IN_MEMORY
2611 | SEC_LINKER_CREATED
2612 | SEC_READONLY))
2613 || !bfd_set_section_alignment (dynobj, sreloc, 2))
2614 return false;
2615 }
2616 if (sec->flags & SEC_READONLY)
2617 info->flags |= DF_TEXTREL;
2618 }
2619
2620 sreloc->_raw_size += sizeof (Elf32_External_Rela);
2621
2622 /* If we are linking with -Bsymbolic, we count the number of PC
2623 relative relocations we have entered for this symbol, so that
2624 we can discard them again if the symbol is later defined by a
2625 regular object. We know that h is really a pointer to an
2626 elf_cris_link_hash_entry. */
2627 if ((r_type == R_CRIS_8_PCREL
2628 || r_type == R_CRIS_16_PCREL
2629 || r_type == R_CRIS_32_PCREL)
2630 && info->symbolic)
2631 {
2632 struct elf_cris_link_hash_entry *eh;
2633 struct elf_cris_pcrel_relocs_copied *p;
2634
2635 eh = (struct elf_cris_link_hash_entry *) h;
2636
2637 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
2638 if (p->section == sreloc)
2639 break;
2640
2641 if (p == NULL)
2642 {
2643 p = ((struct elf_cris_pcrel_relocs_copied *)
2644 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
2645 if (p == NULL)
2646 return false;
2647 p->next = eh->pcrel_relocs_copied;
2648 eh->pcrel_relocs_copied = p;
2649 p->section = sreloc;
2650 p->count = 0;
2651 }
2652
2653 ++p->count;
2654 }
2655 break;
2656
2657 /* This relocation describes the C++ object vtable hierarchy.
2658 Reconstruct it for later use during GC. */
2659 case R_CRIS_GNU_VTINHERIT:
2660 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2661 return false;
2662 break;
2663
2664 /* This relocation describes which C++ vtable entries are actually
2665 used. Record for later use during GC. */
2666 case R_CRIS_GNU_VTENTRY:
2667 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2668 return false;
2669 break;
2670
2671 default:
2672 /* Other relocs do not appear here. */
2673 bfd_set_error (bfd_error_bad_value);
2674 return false;
2675 }
2676 }
2677
2678 return true;
2679 }
2680
2681 /* Set the sizes of the dynamic sections. */
2682
2683 static boolean
2684 elf_cris_size_dynamic_sections (output_bfd, info)
2685 bfd *output_bfd ATTRIBUTE_UNUSED;
2686 struct bfd_link_info *info;
2687 {
2688 bfd *dynobj;
2689 asection *s;
2690 boolean plt;
2691 boolean relocs;
2692
2693 dynobj = elf_hash_table (info)->dynobj;
2694 BFD_ASSERT (dynobj != NULL);
2695
2696 if (elf_hash_table (info)->dynamic_sections_created)
2697 {
2698 /* Set the contents of the .interp section to the interpreter. */
2699 if (!info->shared)
2700 {
2701 s = bfd_get_section_by_name (dynobj, ".interp");
2702 BFD_ASSERT (s != NULL);
2703 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
2704 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2705 }
2706 }
2707 else
2708 {
2709 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */
2710 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2711 elf_cris_adjust_gotplt_to_got,
2712 (PTR) info);
2713
2714 /* We may have created entries in the .rela.got section.
2715 However, if we are not creating the dynamic sections, we will
2716 not actually use these entries. Reset the size of .rela.got,
2717 which will cause it to get stripped from the output file
2718 below. */
2719 s = bfd_get_section_by_name (dynobj, ".rela.got");
2720 if (s != NULL)
2721 s->_raw_size = 0;
2722 }
2723
2724 /* If this is a -Bsymbolic shared link, then we need to discard all PC
2725 relative relocs against symbols defined in a regular object. We
2726 allocated space for them in the check_relocs routine, but we will not
2727 fill them in in the relocate_section routine. We also discard space
2728 for relocs that have become for local symbols due to symbol
2729 visibility changes. For programs, we discard space for relocs for
2730 symbols not referenced by any dynamic object. */
2731 if (info->shared)
2732 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2733 elf_cris_discard_excess_dso_dynamics,
2734 (PTR) info);
2735 else
2736 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2737 elf_cris_discard_excess_program_dynamics,
2738 (PTR) info);
2739
2740 /* The check_relocs and adjust_dynamic_symbol entry points have
2741 determined the sizes of the various dynamic sections. Allocate
2742 memory for them. */
2743 plt = false;
2744 relocs = false;
2745 for (s = dynobj->sections; s != NULL; s = s->next)
2746 {
2747 const char *name;
2748 boolean strip;
2749
2750 if ((s->flags & SEC_LINKER_CREATED) == 0)
2751 continue;
2752
2753 /* It's OK to base decisions on the section name, because none
2754 of the dynobj section names depend upon the input files. */
2755 name = bfd_get_section_name (dynobj, s);
2756
2757 strip = false;
2758
2759 if (strcmp (name, ".plt") == 0)
2760 {
2761 if (s->_raw_size == 0)
2762 {
2763 /* Strip this section if we don't need it; see the
2764 comment below. */
2765 strip = true;
2766 }
2767 else
2768 {
2769 /* Remember whether there is a PLT. */
2770 plt = true;
2771 }
2772 }
2773 else if (strncmp (name, ".rela", 5) == 0)
2774 {
2775 if (s->_raw_size == 0)
2776 {
2777 /* If we don't need this section, strip it from the
2778 output file. This is mostly to handle .rela.bss and
2779 .rela.plt. We must create both sections in
2780 create_dynamic_sections, because they must be created
2781 before the linker maps input sections to output
2782 sections. The linker does that before
2783 adjust_dynamic_symbol is called, and it is that
2784 function which decides whether anything needs to go
2785 into these sections. */
2786 strip = true;
2787 }
2788 else
2789 {
2790 /* Remember whether there are any reloc sections other
2791 than .rela.plt. */
2792 if (strcmp (name, ".rela.plt") != 0)
2793 relocs = true;
2794
2795 /* We use the reloc_count field as a counter if we need
2796 to copy relocs into the output file. */
2797 s->reloc_count = 0;
2798 }
2799 }
2800 else if (strncmp (name, ".got", 4) != 0)
2801 {
2802 /* It's not one of our sections, so don't allocate space. */
2803 continue;
2804 }
2805
2806 if (strip)
2807 {
2808 _bfd_strip_section_from_output (info, s);
2809 continue;
2810 }
2811
2812 /* Allocate memory for the section contents. We use bfd_zalloc here
2813 in case unused entries are not reclaimed before the section's
2814 contents are written out. This should not happen, but this way
2815 if it does, we will not write out garbage. For reloc sections,
2816 this will make entries have the type R_CRIS_NONE. */
2817 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
2818 if (s->contents == NULL && s->_raw_size != 0)
2819 return false;
2820 }
2821
2822 if (elf_hash_table (info)->dynamic_sections_created)
2823 {
2824 /* Add some entries to the .dynamic section. We fill in the
2825 values later, in elf_cris_finish_dynamic_sections, but we
2826 must add the entries now so that we get the correct size for
2827 the .dynamic section. The DT_DEBUG entry is filled in by the
2828 dynamic linker and used by the debugger. */
2829 #define add_dynamic_entry(TAG, VAL) \
2830 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
2831
2832 if (!info->shared)
2833 {
2834 if (!add_dynamic_entry (DT_DEBUG, 0))
2835 return false;
2836 }
2837
2838 if (plt)
2839 {
2840 if (!add_dynamic_entry (DT_PLTGOT, 0)
2841 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2842 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2843 || !add_dynamic_entry (DT_JMPREL, 0))
2844 return false;
2845 }
2846
2847 if (relocs)
2848 {
2849 if (!add_dynamic_entry (DT_RELA, 0)
2850 || !add_dynamic_entry (DT_RELASZ, 0)
2851 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2852 return false;
2853 }
2854
2855 if ((info->flags & DF_TEXTREL) != 0)
2856 {
2857 if (!add_dynamic_entry (DT_TEXTREL, 0))
2858 return false;
2859 info->flags |= DF_TEXTREL;
2860 }
2861 }
2862 #undef add_dynamic_entry
2863
2864 return true;
2865 }
2866
2867 /* This function is called via elf_cris_link_hash_traverse if we are
2868 creating a shared object. In the -Bsymbolic case, it discards the
2869 space allocated to copy PC relative relocs against symbols which
2870 are defined in regular objects. For the normal non-symbolic case,
2871 we also discard space for relocs that have become local due to
2872 symbol visibility changes. We allocated space for them in the
2873 check_relocs routine, but we won't fill them in in the
2874 relocate_section routine. */
2875
2876 static boolean
2877 elf_cris_discard_excess_dso_dynamics (h, inf)
2878 struct elf_cris_link_hash_entry *h;
2879 PTR inf;
2880 {
2881 struct elf_cris_pcrel_relocs_copied *s;
2882 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2883
2884 /* If a symbol has been forced local or we have found a regular
2885 definition for the symbolic link case, then we won't be needing
2886 any relocs. */
2887 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
2888 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
2889 || info->symbolic))
2890 {
2891 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
2892 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
2893 }
2894
2895 return true;
2896 }
2897
2898 /* This function is called via elf_cris_link_hash_traverse if we are *not*
2899 creating a shared object. We discard space for relocs for symbols put
2900 in the .got, but which we found we do not have to resolve at run-time. */
2901
2902 static boolean
2903 elf_cris_discard_excess_program_dynamics (h, inf)
2904 struct elf_cris_link_hash_entry *h;
2905 PTR inf;
2906 {
2907 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2908
2909 /* If we're not creating a shared library and have a symbol which is
2910 referred to by .got references, but the symbol is defined locally,
2911 (or rather, not referred to by a DSO and not defined by a DSO) then
2912 lose the reloc for the .got (don't allocate room for it). */
2913 if ((h->root.elf_link_hash_flags
2914 & (ELF_LINK_HASH_REF_DYNAMIC | ELF_LINK_HASH_DEF_DYNAMIC)) == 0)
2915 {
2916 if (h->root.got.refcount > 0
2917 /* The size of this section is only valid and in sync with the
2918 various reference counts if we do dynamic; don't decrement it
2919 otherwise. */
2920 && elf_hash_table (info)->dynamic_sections_created)
2921 {
2922 bfd *dynobj = elf_hash_table (info)->dynobj;
2923 asection *srelgot;
2924
2925 BFD_ASSERT (dynobj != NULL);
2926
2927 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2928
2929 BFD_ASSERT (srelgot != NULL);
2930
2931 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
2932 }
2933
2934 /* If the locally-defined symbol isn't used by a DSO, then we don't
2935 have to export it as a dynamic symbol. This was already done for
2936 functions; doing this for all symbols would presumably not
2937 introduce new problems. Of course we don't do this if we're
2938 exporting all dynamic symbols. */
2939 if (! info->export_dynamic)
2940 {
2941 h->root.dynindx = -1;
2942 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2943 h->root.dynstr_index);
2944 }
2945 }
2946
2947 return true;
2948 }
2949
2950 /* Reject a file depending on presence and expectation of prefixed
2951 underscores on symbols. */
2952
2953 static boolean
2954 cris_elf_object_p (abfd)
2955 bfd *abfd;
2956 {
2957 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE))
2958 return (bfd_get_symbol_leading_char (abfd) == '_');
2959 else
2960 return (bfd_get_symbol_leading_char (abfd) == 0);
2961 }
2962
2963 /* Mark presence or absence of leading underscore. */
2964
2965 static void
2966 cris_elf_final_write_processing (abfd, linker)
2967 bfd *abfd;
2968 boolean linker ATTRIBUTE_UNUSED;
2969 {
2970 if (bfd_get_symbol_leading_char (abfd) == '_')
2971 elf_elfheader (abfd)->e_flags |= EF_CRIS_UNDERSCORE;
2972 else
2973 elf_elfheader (abfd)->e_flags &= ~EF_CRIS_UNDERSCORE;
2974 }
2975
2976 /* Display the flags field. */
2977
2978 static boolean
2979 cris_elf_print_private_bfd_data (abfd, ptr)
2980 bfd *abfd;
2981 PTR ptr;
2982 {
2983 FILE *file = (FILE *) ptr;
2984
2985 BFD_ASSERT (abfd != NULL && ptr != NULL)
2986
2987 _bfd_elf_print_private_bfd_data (abfd, ptr);
2988
2989 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
2990
2991 if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)
2992 fprintf (file, _(" [symbols have a _ prefix]"));
2993
2994 fputc ('\n', file);
2995 return true;
2996 }
2997
2998 /* Don't mix files with and without a leading underscore. */
2999
3000 static boolean
3001 cris_elf_merge_private_bfd_data (ibfd, obfd)
3002 bfd *ibfd;
3003 bfd *obfd;
3004 {
3005 flagword old_flags, new_flags;
3006
3007 if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
3008 return false;
3009
3010 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
3011 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
3012 return true;
3013
3014 if (! elf_flags_init (obfd))
3015 {
3016 /* This happens when ld starts out with a 'blank' output file. */
3017 elf_flags_init (obfd) = true;
3018
3019 /* Set flags according to current bfd_target. */
3020 cris_elf_final_write_processing (obfd, false);
3021 }
3022
3023 old_flags = elf_elfheader (obfd)->e_flags;
3024 new_flags = elf_elfheader (ibfd)->e_flags;
3025
3026 /* Is this good or bad? We'll follow with other excluding flags. */
3027 if ((old_flags & EF_CRIS_UNDERSCORE) != (new_flags & EF_CRIS_UNDERSCORE))
3028 {
3029 (*_bfd_error_handler)
3030 ((new_flags & EF_CRIS_UNDERSCORE)
3031 ? _("%s: uses _-prefixed symbols, but writing file with non-prefixed symbols")
3032 : _("%s: uses non-prefixed symbols, but writing file with _-prefixed symbols"),
3033 bfd_archive_filename (ibfd));
3034 bfd_set_error (bfd_error_bad_value);
3035 return false;
3036 }
3037
3038 return true;
3039 }
3040
3041
3042 static enum elf_reloc_type_class
3043 elf_cris_reloc_type_class (rela)
3044 const Elf_Internal_Rela *rela;
3045 {
3046 switch ((int) ELF32_R_TYPE (rela->r_info))
3047 {
3048 case R_CRIS_RELATIVE:
3049 return reloc_class_relative;
3050 case R_CRIS_JUMP_SLOT:
3051 return reloc_class_plt;
3052 case R_CRIS_COPY:
3053 return reloc_class_copy;
3054 default:
3055 return reloc_class_normal;
3056 }
3057 }
3058 \f
3059 #define ELF_ARCH bfd_arch_cris
3060 #define ELF_MACHINE_CODE EM_CRIS
3061 #define ELF_MAXPAGESIZE 0x2000
3062
3063 #define TARGET_LITTLE_SYM bfd_elf32_cris_vec
3064 #define TARGET_LITTLE_NAME "elf32-cris"
3065 #define elf_symbol_leading_char 0
3066
3067 #define elf_info_to_howto_rel NULL
3068 #define elf_info_to_howto cris_info_to_howto_rela
3069 #define elf_backend_relocate_section cris_elf_relocate_section
3070 #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook
3071 #define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook
3072 #define elf_backend_check_relocs cris_elf_check_relocs
3073 #define elf_backend_grok_prstatus cris_elf_grok_prstatus
3074 #define elf_backend_grok_psinfo cris_elf_grok_psinfo
3075
3076 #define elf_backend_can_gc_sections 1
3077 #define elf_backend_can_refcount 1
3078
3079 #define elf_backend_object_p cris_elf_object_p
3080 #define elf_backend_final_write_processing \
3081 cris_elf_final_write_processing
3082 #define bfd_elf32_bfd_print_private_bfd_data \
3083 cris_elf_print_private_bfd_data
3084 #define bfd_elf32_bfd_merge_private_bfd_data \
3085 cris_elf_merge_private_bfd_data
3086
3087 #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup
3088
3089 #define bfd_elf32_bfd_link_hash_table_create \
3090 elf_cris_link_hash_table_create
3091 #define elf_backend_adjust_dynamic_symbol \
3092 elf_cris_adjust_dynamic_symbol
3093 #define elf_backend_size_dynamic_sections \
3094 elf_cris_size_dynamic_sections
3095 #define elf_backend_finish_dynamic_symbol \
3096 elf_cris_finish_dynamic_symbol
3097 #define elf_backend_finish_dynamic_sections \
3098 elf_cris_finish_dynamic_sections
3099 #define elf_backend_create_dynamic_sections \
3100 _bfd_elf_create_dynamic_sections
3101 #define bfd_elf32_bfd_final_link \
3102 _bfd_elf32_gc_common_final_link
3103 #define elf_backend_hide_symbol elf_cris_hide_symbol
3104 #define elf_backend_reloc_type_class elf_cris_reloc_type_class
3105
3106 #define elf_backend_want_got_plt 1
3107 #define elf_backend_plt_readonly 1
3108 #define elf_backend_want_plt_sym 0
3109 #define elf_backend_got_header_size 12
3110 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
3111
3112 /* Later, we my want to optimize RELA entries into REL entries for dynamic
3113 linking and libraries (if it's a win of any significance). Until then,
3114 take the easy route. */
3115 #define elf_backend_may_use_rel_p 0
3116 #define elf_backend_may_use_rela_p 1
3117
3118 #include "elf32-target.h"
3119
3120 #define INCLUDED_TARGET_FILE
3121
3122 #undef TARGET_LITTLE_SYM
3123 #undef TARGET_LITTLE_NAME
3124 #undef elf_symbol_leading_char
3125
3126 #define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec
3127 #define TARGET_LITTLE_NAME "elf32-us-cris"
3128 #define elf_symbol_leading_char '_'
3129
3130 #include "elf32-target.h"
GDB Binutils - Deliverables
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