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2002-01-29 Chris Demetriou <cgd@broadcom.com>
[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
1300 outrel.r_offset =
1301 _bfd_elf_section_offset (output_bfd, info, input_section,
1302 rel->r_offset);
1303 if (outrel.r_offset == (bfd_vma) -1)
1304 skip = true;
1305 outrel.r_offset += (input_section->output_section->vma
1306 + input_section->output_offset);
1307
1308 if (skip)
1309 {
1310 memset (&outrel, 0, sizeof outrel);
1311 relocate = false;
1312 }
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 relocate = false;
1322 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1323 outrel.r_addend = relocation + rel->r_addend;
1324 }
1325 else
1326 {
1327 if (r_type == R_CRIS_32)
1328 {
1329 relocate = true;
1330 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1331 outrel.r_addend = relocation + rel->r_addend;
1332 }
1333 else
1334 {
1335 long indx;
1336
1337 if (h == NULL)
1338 sec = local_sections[r_symndx];
1339 else
1340 {
1341 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1342 || (h->root.type
1343 == bfd_link_hash_defweak));
1344 sec = h->root.u.def.section;
1345 }
1346 if (sec != NULL && bfd_is_abs_section (sec))
1347 indx = 0;
1348 else if (sec == NULL || sec->owner == NULL)
1349 {
1350 bfd_set_error (bfd_error_bad_value);
1351 return false;
1352 }
1353 else
1354 {
1355 asection *osec;
1356
1357 osec = sec->output_section;
1358 indx = elf_section_data (osec)->dynindx;
1359 BFD_ASSERT (indx > 0);
1360 }
1361
1362 relocate = false;
1363 outrel.r_info = ELF32_R_INFO (indx, r_type);
1364 outrel.r_addend = relocation + rel->r_addend;
1365 }
1366 }
1367
1368 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1369 (((Elf32_External_Rela *)
1370 sreloc->contents)
1371 + sreloc->reloc_count));
1372 ++sreloc->reloc_count;
1373
1374 /* This reloc will be computed at runtime, so there's no
1375 need to do anything now, except for R_CRIS_32 relocations
1376 that have been turned into R_CRIS_RELATIVE. */
1377 if (!relocate)
1378 continue;
1379 }
1380
1381 break;
1382 }
1383
1384 r = cris_final_link_relocate (howto, input_bfd, input_section,
1385 contents, rel, relocation);
1386
1387 if (r != bfd_reloc_ok)
1388 {
1389 const char * msg = (const char *) NULL;
1390
1391 switch (r)
1392 {
1393 case bfd_reloc_overflow:
1394 r = info->callbacks->reloc_overflow
1395 (info, symname, howto->name, (bfd_vma) 0,
1396 input_bfd, input_section, rel->r_offset);
1397 break;
1398
1399 case bfd_reloc_undefined:
1400 r = info->callbacks->undefined_symbol
1401 (info, symname, input_bfd, input_section, rel->r_offset,
1402 true);
1403 break;
1404
1405 case bfd_reloc_outofrange:
1406 msg = _("internal error: out of range error");
1407 break;
1408
1409 case bfd_reloc_notsupported:
1410 msg = _("internal error: unsupported relocation error");
1411 break;
1412
1413 case bfd_reloc_dangerous:
1414 msg = _("internal error: dangerous relocation");
1415 break;
1416
1417 default:
1418 msg = _("internal error: unknown error");
1419 break;
1420 }
1421
1422 if (msg)
1423 r = info->callbacks->warning
1424 (info, msg, symname, input_bfd, input_section, rel->r_offset);
1425
1426 if (! r)
1427 return false;
1428 }
1429 }
1430
1431 return true;
1432 }
1433 \f
1434 /* Finish up dynamic symbol handling. We set the contents of various
1435 dynamic sections here. */
1436
1437 static boolean
1438 elf_cris_finish_dynamic_symbol (output_bfd, info, h, sym)
1439 bfd *output_bfd;
1440 struct bfd_link_info *info;
1441 struct elf_link_hash_entry *h;
1442 Elf_Internal_Sym *sym;
1443 {
1444 bfd *dynobj;
1445 int plt_off1 = 2, plt_off2 = 10, plt_off3 = 16;
1446
1447 dynobj = elf_hash_table (info)->dynobj;
1448
1449 if (h->plt.offset != (bfd_vma) -1)
1450 {
1451 asection *splt;
1452 asection *sgotplt;
1453 asection *sgot;
1454 asection *srela;
1455 bfd_vma got_base;
1456
1457 bfd_vma gotplt_offset
1458 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset;
1459 Elf_Internal_Rela rela;
1460 boolean has_gotplt = gotplt_offset != 0;
1461
1462 /* Get the index in the procedure linkage table which
1463 corresponds to this symbol. This is the index of this symbol
1464 in all the symbols for which we are making plt entries. The
1465 first entry in the procedure linkage table is reserved. */
1466 /* We have to count backwards here, and the result is only valid as
1467 an index into .got.plt and its relocations. FIXME: Constants... */
1468 bfd_vma gotplt_index = gotplt_offset/4 - 3;
1469
1470 /* Get the offset into the .got table of the entry that corresponds
1471 to this function. Note that we embed knowledge that "incoming"
1472 .got goes after .got.plt in the output without padding (pointer
1473 aligned). However, that knowledge is present in several other
1474 places too, here and in elflink.h at least. */
1475 bfd_vma got_offset
1476 = (has_gotplt
1477 ? gotplt_offset
1478 : h->got.offset + elf_cris_hash_table(info)->next_gotplt_entry);
1479
1480 /* This symbol has an entry in the procedure linkage table. Set it
1481 up. */
1482
1483 BFD_ASSERT (h->dynindx != -1);
1484
1485 splt = bfd_get_section_by_name (dynobj, ".plt");
1486 sgot = bfd_get_section_by_name (dynobj, ".got");
1487 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1488 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1489 BFD_ASSERT (splt != NULL && sgotplt != NULL
1490 && (! has_gotplt || srela != NULL));
1491
1492 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1493
1494 /* Fill in the entry in the procedure linkage table. */
1495 if (! info->shared)
1496 {
1497 memcpy (splt->contents + h->plt.offset, elf_cris_plt_entry,
1498 PLT_ENTRY_SIZE);
1499
1500 /* We need to enter the absolute address of the GOT entry here. */
1501 bfd_put_32 (output_bfd, got_base + got_offset,
1502 splt->contents + h->plt.offset + plt_off1);
1503 }
1504 else
1505 {
1506 memcpy (splt->contents + h->plt.offset, elf_cris_pic_plt_entry,
1507 PLT_ENTRY_SIZE);
1508 bfd_put_32 (output_bfd, got_offset,
1509 splt->contents + h->plt.offset + plt_off1);
1510 }
1511
1512 /* Fill in the plt entry and make a relocation, if this is a "real"
1513 PLT entry. */
1514 if (has_gotplt)
1515 {
1516 /* Fill in the offset into the reloc table. */
1517 bfd_put_32 (output_bfd,
1518 gotplt_index * sizeof (Elf32_External_Rela),
1519 splt->contents + h->plt.offset + plt_off2);
1520
1521 /* Fill in the offset to the first PLT entry, where to "jump". */
1522 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3 + 4),
1523 splt->contents + h->plt.offset + plt_off3);
1524
1525 /* Fill in the entry in the global offset table with the address of
1526 the relocating stub. */
1527 bfd_put_32 (output_bfd,
1528 (splt->output_section->vma
1529 + splt->output_offset
1530 + h->plt.offset
1531 + 8),
1532 sgotplt->contents + got_offset);
1533
1534 /* Fill in the entry in the .rela.plt section. */
1535 rela.r_offset = (sgotplt->output_section->vma
1536 + sgotplt->output_offset
1537 + got_offset);
1538 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_JUMP_SLOT);
1539 rela.r_addend = 0;
1540 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1541 ((Elf32_External_Rela *) srela->contents
1542 + gotplt_index));
1543 }
1544
1545 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1546 {
1547 /* Mark the symbol as undefined, rather than as defined in
1548 the .plt section. Leave the value alone. */
1549 sym->st_shndx = SHN_UNDEF;
1550
1551 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't
1552 know whether resetting the value is significant; if it really
1553 is, rather than a quirk or bug in the sparc port, then I
1554 believe we'd see this elsewhere. */
1555 /* If the symbol is weak, we do need to clear the value.
1556 Otherwise, the PLT entry would provide a definition for
1557 the symbol even if the symbol wasn't defined anywhere,
1558 and so the symbol would never be NULL. */
1559 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
1560 == 0)
1561 sym->st_value = 0;
1562 }
1563 }
1564
1565 /* We don't emit .got relocs for symbols that aren't in the
1566 dynamic-symbols table for an ordinary program. */
1567 if (h->got.offset != (bfd_vma) -1
1568 && (info->shared || h->dynindx != -1))
1569 {
1570 asection *sgot;
1571 asection *srela;
1572 Elf_Internal_Rela rela;
1573 bfd_byte *where;
1574
1575 /* This symbol has an entry in the global offset table. Set it up. */
1576
1577 sgot = bfd_get_section_by_name (dynobj, ".got");
1578 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1579 BFD_ASSERT (sgot != NULL && srela != NULL);
1580
1581 rela.r_offset = (sgot->output_section->vma
1582 + sgot->output_offset
1583 + (h->got.offset &~ (bfd_vma) 1));
1584
1585 /* If this is a static link, or it is a -Bsymbolic link and the
1586 symbol is defined locally or was forced to be local because
1587 of a version file, we just want to emit a RELATIVE reloc.
1588 The entry in the global offset table will already have been
1589 initialized in the relocate_section function. */
1590 where = sgot->contents + (h->got.offset &~ (bfd_vma) 1);
1591 if (! elf_hash_table (info)->dynamic_sections_created
1592 || (info->shared
1593 && (info->symbolic || h->dynindx == -1)
1594 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1595 {
1596 rela.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1597 rela.r_addend = bfd_get_signed_32 (output_bfd, where);
1598 }
1599 else
1600 {
1601 bfd_put_32 (output_bfd, (bfd_vma) 0, where);
1602 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_GLOB_DAT);
1603 rela.r_addend = 0;
1604 }
1605
1606 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1607 ((Elf32_External_Rela *) srela->contents
1608 + srela->reloc_count));
1609 ++srela->reloc_count;
1610 }
1611
1612 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1613 {
1614 asection *s;
1615 Elf_Internal_Rela rela;
1616
1617 /* This symbol needs a copy reloc. Set it up. */
1618
1619 BFD_ASSERT (h->dynindx != -1
1620 && (h->root.type == bfd_link_hash_defined
1621 || h->root.type == bfd_link_hash_defweak));
1622
1623 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1624 ".rela.bss");
1625 BFD_ASSERT (s != NULL);
1626
1627 rela.r_offset = (h->root.u.def.value
1628 + h->root.u.def.section->output_section->vma
1629 + h->root.u.def.section->output_offset);
1630 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_COPY);
1631 rela.r_addend = 0;
1632 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1633 ((Elf32_External_Rela *) s->contents
1634 + s->reloc_count));
1635 ++s->reloc_count;
1636 }
1637
1638 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1639 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1640 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1641 sym->st_shndx = SHN_ABS;
1642
1643 return true;
1644 }
1645 \f
1646 /* Finish up the dynamic sections. */
1647
1648 static boolean
1649 elf_cris_finish_dynamic_sections (output_bfd, info)
1650 bfd *output_bfd;
1651 struct bfd_link_info *info;
1652 {
1653 bfd *dynobj;
1654 asection *sgot;
1655 asection *sdyn;
1656
1657 dynobj = elf_hash_table (info)->dynobj;
1658
1659 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1660 BFD_ASSERT (sgot != NULL);
1661 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1662
1663 if (elf_hash_table (info)->dynamic_sections_created)
1664 {
1665 asection *splt;
1666 Elf32_External_Dyn *dyncon, *dynconend;
1667
1668 splt = bfd_get_section_by_name (dynobj, ".plt");
1669 BFD_ASSERT (splt != NULL && sdyn != NULL);
1670
1671 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1672 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1673 for (; dyncon < dynconend; dyncon++)
1674 {
1675 Elf_Internal_Dyn dyn;
1676 asection *s;
1677
1678 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1679
1680 switch (dyn.d_tag)
1681 {
1682 default:
1683 break;
1684
1685 case DT_PLTGOT:
1686 s = bfd_get_section_by_name (output_bfd, ".got");
1687 BFD_ASSERT (s != NULL);
1688 dyn.d_un.d_ptr = s->vma;
1689 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1690 break;
1691
1692 case DT_JMPREL:
1693 /* Yes, we *can* have a .plt and no .plt.rela, for instance
1694 if all symbols are found in the .got (not .got.plt). */
1695 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1696 dyn.d_un.d_ptr = s != NULL ? s->vma : 0;
1697 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1698 break;
1699
1700 case DT_PLTRELSZ:
1701 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1702 if (s == NULL)
1703 dyn.d_un.d_val = 0;
1704 else if (s->_cooked_size != 0)
1705 dyn.d_un.d_val = s->_cooked_size;
1706 else
1707 dyn.d_un.d_val = s->_raw_size;
1708 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1709 break;
1710
1711 case DT_RELASZ:
1712 /* The procedure linkage table relocs (DT_JMPREL) should
1713 not be included in the overall relocs (DT_RELA).
1714 Therefore, we override the DT_RELASZ entry here to
1715 make it not include the JMPREL relocs. Since the
1716 linker script arranges for .rela.plt to follow all
1717 other relocation sections, we don't have to worry
1718 about changing the DT_RELA entry. */
1719 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1720 if (s != NULL)
1721 {
1722 if (s->_cooked_size != 0)
1723 dyn.d_un.d_val -= s->_cooked_size;
1724 else
1725 dyn.d_un.d_val -= s->_raw_size;
1726 }
1727 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1728 break;
1729 }
1730 }
1731
1732 /* Fill in the first entry in the procedure linkage table. */
1733 if (splt->_raw_size > 0)
1734 {
1735 if (info->shared)
1736 memcpy (splt->contents, elf_cris_pic_plt0_entry, PLT_ENTRY_SIZE);
1737 else
1738 {
1739 memcpy (splt->contents, elf_cris_plt0_entry, PLT_ENTRY_SIZE);
1740 bfd_put_32 (output_bfd,
1741 sgot->output_section->vma + sgot->output_offset + 4,
1742 splt->contents + 6);
1743 bfd_put_32 (output_bfd,
1744 sgot->output_section->vma + sgot->output_offset + 8,
1745 splt->contents + 14);
1746
1747 elf_section_data (splt->output_section)->this_hdr.sh_entsize
1748 = PLT_ENTRY_SIZE;
1749 }
1750 }
1751 }
1752
1753 /* Fill in the first three entries in the global offset table. */
1754 if (sgot->_raw_size > 0)
1755 {
1756 if (sdyn == NULL)
1757 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1758 else
1759 bfd_put_32 (output_bfd,
1760 sdyn->output_section->vma + sdyn->output_offset,
1761 sgot->contents);
1762 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
1763 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
1764 }
1765
1766 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1767
1768 return true;
1769 }
1770 \f
1771 /* Return the section that should be marked against GC for a given
1772 relocation. */
1773
1774 static asection *
1775 cris_elf_gc_mark_hook (abfd, info, rel, h, sym)
1776 bfd * abfd;
1777 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1778 Elf_Internal_Rela * rel;
1779 struct elf_link_hash_entry * h;
1780 Elf_Internal_Sym * sym;
1781 {
1782 if (h != NULL)
1783 {
1784 switch (ELF32_R_TYPE (rel->r_info))
1785 {
1786 case R_CRIS_GNU_VTINHERIT:
1787 case R_CRIS_GNU_VTENTRY:
1788 break;
1789
1790 default:
1791 switch (h->root.type)
1792 {
1793 case bfd_link_hash_defined:
1794 case bfd_link_hash_defweak:
1795 return h->root.u.def.section;
1796
1797 case bfd_link_hash_common:
1798 return h->root.u.c.p->section;
1799
1800 default:
1801 break;
1802 }
1803 }
1804 }
1805 else
1806 {
1807 return bfd_section_from_elf_index (abfd, sym->st_shndx);
1808 }
1809
1810 return NULL;
1811 }
1812
1813 /* Update the got entry reference counts for the section being removed. */
1814
1815 static boolean
1816 cris_elf_gc_sweep_hook (abfd, info, sec, relocs)
1817 bfd * abfd ATTRIBUTE_UNUSED;
1818 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1819 asection * sec ATTRIBUTE_UNUSED;
1820 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
1821 {
1822 Elf_Internal_Shdr *symtab_hdr;
1823 struct elf_link_hash_entry **sym_hashes;
1824 bfd_signed_vma *local_got_refcounts;
1825 const Elf_Internal_Rela *rel, *relend;
1826 unsigned long r_symndx;
1827 struct elf_link_hash_entry *h;
1828 bfd *dynobj;
1829 asection *sgot;
1830 asection *srelgot;
1831
1832 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1833 sym_hashes = elf_sym_hashes (abfd);
1834 local_got_refcounts = elf_local_got_refcounts (abfd);
1835
1836 dynobj = elf_hash_table (info)->dynobj;
1837 if (dynobj == NULL)
1838 return true;
1839
1840 sgot = bfd_get_section_by_name (dynobj, ".got");
1841 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1842
1843 relend = relocs + sec->reloc_count;
1844 for (rel = relocs; rel < relend; rel++)
1845 {
1846 switch (ELF32_R_TYPE (rel->r_info))
1847 {
1848 case R_CRIS_16_GOT:
1849 case R_CRIS_32_GOT:
1850 r_symndx = ELF32_R_SYM (rel->r_info);
1851 if (r_symndx >= symtab_hdr->sh_info)
1852 {
1853 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1854 if (h->got.refcount > 0)
1855 {
1856 --h->got.refcount;
1857 if (h->got.refcount == 0)
1858 {
1859 /* We don't need the .got entry any more. */
1860 sgot->_raw_size -= 4;
1861 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
1862 }
1863 }
1864 break;
1865 }
1866
1867 local_got_reloc:
1868 if (local_got_refcounts != NULL)
1869 {
1870 if (local_got_refcounts[r_symndx] > 0)
1871 {
1872 --local_got_refcounts[r_symndx];
1873 if (local_got_refcounts[r_symndx] == 0)
1874 {
1875 /* We don't need the .got entry any more. */
1876 sgot->_raw_size -= 4;
1877 if (info->shared)
1878 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
1879 }
1880 }
1881 }
1882 break;
1883
1884 case R_CRIS_16_GOTPLT:
1885 case R_CRIS_32_GOTPLT:
1886 /* For local symbols, treat these like GOT relocs. */
1887 r_symndx = ELF32_R_SYM (rel->r_info);
1888 if (r_symndx < symtab_hdr->sh_info)
1889 goto local_got_reloc;
1890
1891 case R_CRIS_32_PLT_GOTREL:
1892 /* FIXME: We don't garbage-collect away the .got section. */
1893 if (local_got_refcounts != NULL)
1894 local_got_refcounts[-1]--;
1895 /* Fall through. */
1896
1897 case R_CRIS_8_PCREL:
1898 case R_CRIS_16_PCREL:
1899 case R_CRIS_32_PCREL:
1900 case R_CRIS_32_PLT_PCREL:
1901 r_symndx = ELF32_R_SYM (rel->r_info);
1902 if (r_symndx >= symtab_hdr->sh_info)
1903 {
1904 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1905 if (h->plt.refcount > 0)
1906 --h->plt.refcount;
1907 }
1908 break;
1909
1910 default:
1911 break;
1912 }
1913 }
1914
1915 return true;
1916 }
1917
1918 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1919 entry but we found we will not create any. Called when we find we will
1920 not have any PLT for this symbol, by for example
1921 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link,
1922 or elf_cris_size_dynamic_sections if no dynamic sections will be
1923 created (we're only linking static objects). */
1924
1925 static boolean
1926 elf_cris_adjust_gotplt_to_got (h, p)
1927 struct elf_cris_link_hash_entry *h;
1928 PTR p;
1929 {
1930 struct bfd_link_info *info = (struct bfd_link_info *) p;
1931 bfd *dynobj = elf_hash_table (info)->dynobj;
1932
1933 BFD_ASSERT (dynobj != NULL);
1934
1935 /* If nobody wanted a GOTPLT with this symbol, we're done. */
1936 if (h->gotplt_refcount <= 0)
1937 return true;
1938
1939 if (h->root.got.refcount > 0)
1940 {
1941 /* There's a GOT entry for this symbol. Just adjust the refcount.
1942 Probably not necessary at this stage, but keeping it accurate
1943 helps avoiding surprises later. */
1944 h->root.got.refcount += h->gotplt_refcount;
1945 h->gotplt_refcount = -1;
1946 }
1947 else
1948 {
1949 /* No GOT entry for this symbol. We need to create one. */
1950 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
1951 asection *srelgot
1952 = bfd_get_section_by_name (dynobj, ".rela.got");
1953
1954 /* Put an accurate refcount there. */
1955 h->root.got.refcount = h->gotplt_refcount;
1956
1957 h->gotplt_refcount = -1;
1958
1959 /* We always have a .got section when there are dynamic
1960 relocs. */
1961 BFD_ASSERT (sgot != NULL /* Surely have .got section. */);
1962
1963 /* We might have had a PLT but with no GOT entry and
1964 further no GOT reloc section at all needed before.
1965 Add it. */
1966 if (srelgot == NULL)
1967 {
1968 srelgot = bfd_make_section (dynobj, ".rela.got");
1969
1970 if (srelgot == NULL
1971 || !bfd_set_section_flags (dynobj, srelgot,
1972 (SEC_ALLOC
1973 | SEC_LOAD
1974 | SEC_HAS_CONTENTS
1975 | SEC_IN_MEMORY
1976 | SEC_LINKER_CREATED
1977 | SEC_READONLY))
1978 || !bfd_set_section_alignment (dynobj, srelgot, 2))
1979 return false;
1980 }
1981
1982 /* Allocate space in the .got section. */
1983 sgot->_raw_size += 4;
1984
1985 /* Allocate relocation space. */
1986 srelgot->_raw_size += sizeof (Elf32_External_Rela);
1987 }
1988
1989 return true;
1990 }
1991
1992 /* Try to fold PLT entries with GOT entries. There are two cases when we
1993 want to do this:
1994
1995 - When all PLT references are GOTPLT references, and there are GOT
1996 references. We don't have to generate a PLT at all.
1997
1998 - When there are both (ordinary) PLT references and GOT references.
1999 We want to make the PLT reference use the ordinary GOT entry rather
2000 than a run-time dynamically resolved GOTPLT entry (since the GOT
2001 entry will have to be resolved at startup anyway).
2002
2003 Though the latter case is handled when room for the PLT is allocated,
2004 not here.
2005
2006 Note that this function is called before symbols are forced local by
2007 version scripts. The differing cases are handled by
2008 elf_cris_hide_symbol. */
2009
2010 static boolean
2011 elf_cris_try_fold_plt_to_got (h, p)
2012 struct elf_cris_link_hash_entry *h;
2013 PTR p;
2014 {
2015 struct bfd_link_info *info = (struct bfd_link_info *) p;
2016
2017 /* If there are no GOT references for this symbol, we can't fold any
2018 other reference so there's nothing to do. Likewise if there are no
2019 PLT references; GOTPLT references included. */
2020 if (h->root.got.refcount <= 0 || h->root.plt.refcount <= 0)
2021 return true;
2022
2023 /* GOTPLT relocs are supposed to be included into the PLT refcount. */
2024 BFD_ASSERT (h->gotplt_refcount <= h->root.plt.refcount);
2025
2026 if (h->gotplt_refcount == h->root.plt.refcount)
2027 {
2028 /* The only PLT references are GOTPLT references, and there are GOT
2029 references. Convert PLT to GOT references. */
2030 if (! elf_cris_adjust_gotplt_to_got (h, info))
2031 return false;
2032
2033 /* Clear the PLT references, so no PLT will be created. */
2034 h->root.plt.offset = (bfd_vma) -1;
2035 }
2036
2037 return true;
2038 }
2039
2040 /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc
2041 to use a GOT entry (and create one) rather than requiring a GOTPLT
2042 entry. */
2043
2044 static void
2045 elf_cris_hide_symbol (info, h, force_local)
2046 struct bfd_link_info *info;
2047 struct elf_link_hash_entry *h;
2048 boolean force_local;
2049 {
2050 elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info);
2051
2052 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
2053 }
2054
2055 /* Adjust a symbol defined by a dynamic object and referenced by a
2056 regular object. The current definition is in some section of the
2057 dynamic object, but we're not including those sections. We have to
2058 change the definition to something the rest of the link can
2059 understand. */
2060
2061 static boolean
2062 elf_cris_adjust_dynamic_symbol (info, h)
2063 struct bfd_link_info *info;
2064 struct elf_link_hash_entry *h;
2065 {
2066 bfd *dynobj;
2067 asection *s;
2068 unsigned int power_of_two;
2069
2070 dynobj = elf_hash_table (info)->dynobj;
2071
2072 /* Make sure we know what is going on here. */
2073 BFD_ASSERT (dynobj != NULL
2074 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
2075 || h->weakdef != NULL
2076 || ((h->elf_link_hash_flags
2077 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2078 && (h->elf_link_hash_flags
2079 & ELF_LINK_HASH_REF_REGULAR) != 0
2080 && (h->elf_link_hash_flags
2081 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
2082
2083 /* If this is a function, put it in the procedure linkage table. We
2084 will fill in the contents of the procedure linkage table later,
2085 when we know the address of the .got section. */
2086 if (h->type == STT_FUNC
2087 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
2088 {
2089 if (! info->shared
2090 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
2091 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
2092 /* We must always create the plt entry if it was referenced by a
2093 PLT relocation. In this case we already recorded it as a
2094 dynamic symbol. */
2095 /* FIXME: m68k and i386 differ here, for unclear reasons. */
2096 && h->dynindx == -1)
2097 {
2098 /* This case can occur if we saw a PLT reloc in an input file,
2099 but the symbol was never referred to by a dynamic object. In
2100 such a case, we don't actually need to build a procedure
2101 linkage table, and we can just do a PC reloc instead, or
2102 change a .got.plt index to a .got index for GOTPLT relocs. */
2103 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
2104 h->plt.offset = (bfd_vma) -1;
2105
2106 return
2107 elf_cris_adjust_gotplt_to_got ((struct
2108 elf_cris_link_hash_entry *) h,
2109 info);
2110 }
2111
2112 /* If there are only GOT references and GOTPLT references to this
2113 PLT entry, get rid of the PLT. */
2114 if (! elf_cris_try_fold_plt_to_got ((struct elf_cris_link_hash_entry *)
2115 h, info))
2116 return false;
2117
2118 /* GC or folding may have rendered this entry unused. */
2119 if (h->plt.refcount <= 0)
2120 {
2121 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
2122 h->plt.offset = (bfd_vma) -1;
2123 return true;
2124 }
2125
2126 /* Make sure this symbol is output as a dynamic symbol. */
2127 if (h->dynindx == -1)
2128 {
2129 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
2130 return false;
2131 }
2132
2133 s = bfd_get_section_by_name (dynobj, ".plt");
2134 BFD_ASSERT (s != NULL);
2135
2136 /* If this is the first .plt entry, make room for the special
2137 first entry. */
2138 if (s->_raw_size == 0)
2139 s->_raw_size += PLT_ENTRY_SIZE;
2140
2141 /* If this symbol is not defined in a regular file, and we are
2142 not generating a shared library, then set the symbol to this
2143 location in the .plt. This is required to make function
2144 pointers compare as equal between the normal executable and
2145 the shared library. */
2146 if (!info->shared
2147 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2148 {
2149 h->root.u.def.section = s;
2150 h->root.u.def.value = s->_raw_size;
2151 }
2152
2153 /* If there's already a GOT entry, use that, not a .got.plt. A
2154 GOT field still has a reference count when we get here; it's
2155 not yet changed to an offset. */
2156 if (h->got.refcount > 0)
2157 {
2158 h->got.refcount += h->plt.refcount;
2159
2160 /* Mark the PLT offset to use the GOT entry by setting the low
2161 bit in the plt offset; it is always a multiple of
2162 pointer-size. */
2163 BFD_ASSERT ((s->_raw_size & 3) == 0);
2164
2165 /* Change the PLT refcount to an offset. */
2166 h->plt.offset = s->_raw_size;
2167
2168 /* By not setting gotplt_offset (i.e. it remains at 0), we signal
2169 that the got entry should be used instead. */
2170 BFD_ASSERT (((struct elf_cris_link_hash_entry *)
2171 h)->gotplt_offset == 0);
2172
2173 /* Make room for this entry. */
2174 s->_raw_size += PLT_ENTRY_SIZE;
2175
2176 return true;
2177 }
2178
2179 /* No GOT reference for this symbol; prepare for an ordinary PLT. */
2180 h->plt.offset = s->_raw_size;
2181
2182 /* Make room for this entry. */
2183 s->_raw_size += PLT_ENTRY_SIZE;
2184
2185 /* We also need to make an entry in the .got.plt section, which
2186 will be placed in the .got section by the linker script. */
2187 ((struct elf_cris_link_hash_entry *) h)->gotplt_offset
2188 = elf_cris_hash_table (info)->next_gotplt_entry;
2189 elf_cris_hash_table (info)->next_gotplt_entry += 4;
2190
2191 s = bfd_get_section_by_name (dynobj, ".got.plt");
2192 BFD_ASSERT (s != NULL);
2193 s->_raw_size += 4;
2194
2195 /* We also need to make an entry in the .rela.plt section. */
2196
2197 s = bfd_get_section_by_name (dynobj, ".rela.plt");
2198 BFD_ASSERT (s != NULL);
2199 s->_raw_size += sizeof (Elf32_External_Rela);
2200
2201 return true;
2202 }
2203
2204 /* Reinitialize the plt offset now that it is not used as a reference
2205 count any more. */
2206 h->plt.offset = (bfd_vma) -1;
2207
2208 /* If this is a weak symbol, and there is a real definition, the
2209 processor independent code will have arranged for us to see the
2210 real definition first, and we can just use the same value. */
2211 if (h->weakdef != NULL)
2212 {
2213 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
2214 || h->weakdef->root.type == bfd_link_hash_defweak);
2215 h->root.u.def.section = h->weakdef->root.u.def.section;
2216 h->root.u.def.value = h->weakdef->root.u.def.value;
2217 return true;
2218 }
2219
2220 /* This is a reference to a symbol defined by a dynamic object which
2221 is not a function. */
2222
2223 /* If we are creating a shared library, we must presume that the
2224 only references to the symbol are via the global offset table.
2225 For such cases we need not do anything here; the relocations will
2226 be handled correctly by relocate_section. */
2227 if (info->shared)
2228 return true;
2229
2230 /* If there are no references to this symbol that do not use the
2231 GOT, we don't need to generate a copy reloc. */
2232 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
2233 return true;
2234
2235 /* We must allocate the symbol in our .dynbss section, which will
2236 become part of the .bss section of the executable. There will be
2237 an entry for this symbol in the .dynsym section. The dynamic
2238 object will contain position independent code, so all references
2239 from the dynamic object to this symbol will go through the global
2240 offset table. The dynamic linker will use the .dynsym entry to
2241 determine the address it must put in the global offset table, so
2242 both the dynamic object and the regular object will refer to the
2243 same memory location for the variable. */
2244
2245 s = bfd_get_section_by_name (dynobj, ".dynbss");
2246 BFD_ASSERT (s != NULL);
2247
2248 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to
2249 copy the initial value out of the dynamic object and into the
2250 runtime process image. We need to remember the offset into the
2251 .rela.bss section we are going to use. */
2252 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2253 {
2254 asection *srel;
2255
2256 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
2257 BFD_ASSERT (srel != NULL);
2258 srel->_raw_size += sizeof (Elf32_External_Rela);
2259 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
2260 }
2261
2262 /* Historic precedent: m68k and i386 allow max 8-byte alignment for the
2263 thing to copy; so do we. */
2264
2265 /* We need to figure out the alignment required for this symbol. I
2266 have no idea how ELF linkers handle this. */
2267 power_of_two = bfd_log2 (h->size);
2268 if (power_of_two > 3)
2269 power_of_two = 3;
2270
2271 /* Apply the required alignment. */
2272 s->_raw_size = BFD_ALIGN (s->_raw_size,
2273 (bfd_size_type) (1 << power_of_two));
2274 if (power_of_two > bfd_get_section_alignment (dynobj, s))
2275 {
2276 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
2277 return false;
2278 }
2279
2280 /* Define the symbol as being at this point in the section. */
2281 h->root.u.def.section = s;
2282 h->root.u.def.value = s->_raw_size;
2283
2284 /* Increment the section size to make room for the symbol. */
2285 s->_raw_size += h->size;
2286
2287 return true;
2288 }
2289
2290 /* Look through the relocs for a section during the first phase. */
2291
2292 static boolean
2293 cris_elf_check_relocs (abfd, info, sec, relocs)
2294 bfd *abfd;
2295 struct bfd_link_info *info;
2296 asection *sec;
2297 const Elf_Internal_Rela *relocs;
2298 {
2299 bfd *dynobj;
2300 Elf_Internal_Shdr *symtab_hdr;
2301 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
2302 bfd_signed_vma *local_got_refcounts;
2303 const Elf_Internal_Rela *rel;
2304 const Elf_Internal_Rela *rel_end;
2305 asection *sgot;
2306 asection *srelgot;
2307 asection *sreloc;
2308
2309 if (info->relocateable)
2310 return true;
2311
2312 dynobj = elf_hash_table (info)->dynobj;
2313 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2314 sym_hashes = elf_sym_hashes (abfd);
2315 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
2316 local_got_refcounts = elf_local_got_refcounts (abfd);
2317
2318 sgot = NULL;
2319 srelgot = NULL;
2320 sreloc = NULL;
2321
2322 if (!elf_bad_symtab (abfd))
2323 sym_hashes_end -= symtab_hdr->sh_info;
2324
2325 rel_end = relocs + sec->reloc_count;
2326 for (rel = relocs; rel < rel_end; rel++)
2327 {
2328 struct elf_link_hash_entry *h;
2329 unsigned long r_symndx;
2330 enum elf_cris_reloc_type r_type;
2331
2332 r_symndx = ELF32_R_SYM (rel->r_info);
2333 if (r_symndx < symtab_hdr->sh_info)
2334 h = NULL;
2335 else
2336 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2337
2338 r_type = ELF32_R_TYPE (rel->r_info);
2339
2340 /* Some relocs require linker-created sections; we need to hang them
2341 on the first input bfd we found that contained dynamic relocs. */
2342 switch (r_type)
2343 {
2344 case R_CRIS_16_GOT:
2345 case R_CRIS_32_GOT:
2346 case R_CRIS_32_GOTREL:
2347 case R_CRIS_32_PLT_GOTREL:
2348 case R_CRIS_32_PLT_PCREL:
2349 case R_CRIS_16_GOTPLT:
2350 case R_CRIS_32_GOTPLT:
2351 if (dynobj == NULL)
2352 {
2353 elf_hash_table (info)->dynobj = dynobj = abfd;
2354
2355 /* Create the .got section, so we can assume it's always
2356 present whenever there's a dynobj. */
2357 if (!_bfd_elf_create_got_section (dynobj, info))
2358 return false;
2359 }
2360 break;
2361
2362 default:
2363 break;
2364 }
2365
2366 /* Some relocs require a global offset table (but perhaps not a
2367 specific GOT entry). */
2368 switch (r_type)
2369 {
2370 case R_CRIS_16_GOT:
2371 case R_CRIS_32_GOT:
2372 case R_CRIS_32_GOTREL:
2373 case R_CRIS_32_PLT_GOTREL:
2374 if (sgot == NULL)
2375 sgot = bfd_get_section_by_name (dynobj, ".got");
2376
2377 if (local_got_refcounts == NULL)
2378 {
2379 bfd_size_type amt;
2380
2381 /* We use index local_got_refcounts[-1] to count all
2382 GOT-relative relocations that do not have explicit
2383 GOT entries. */
2384 amt = symtab_hdr->sh_info + 1;
2385 amt *= sizeof (bfd_signed_vma);
2386 local_got_refcounts = ((bfd_signed_vma *) bfd_zalloc (abfd, amt));
2387 if (local_got_refcounts == NULL)
2388 return false;
2389
2390 local_got_refcounts++;
2391 elf_local_got_refcounts (abfd) = local_got_refcounts;
2392 }
2393 break;
2394
2395 default:
2396 break;
2397 }
2398
2399 switch (r_type)
2400 {
2401 case R_CRIS_16_GOTPLT:
2402 case R_CRIS_32_GOTPLT:
2403 /* Mark that we need a GOT entry if the PLT entry (and its GOT
2404 entry) is eliminated. We can only do this for a non-local
2405 symbol. */
2406 if (h != NULL)
2407 {
2408 ((struct elf_cris_link_hash_entry *) h)->gotplt_refcount++;
2409 goto handle_gotplt_reloc;
2410 }
2411 /* If h is NULL then this is a local symbol, and we must make a
2412 GOT entry for it, so handle it like a GOT reloc. */
2413 /* Fall through. */
2414
2415 case R_CRIS_16_GOT:
2416 case R_CRIS_32_GOT:
2417 /* This symbol requires a global offset table entry. */
2418
2419 if (srelgot == NULL
2420 && (h != NULL || info->shared))
2421 {
2422 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2423 if (srelgot == NULL)
2424 {
2425 srelgot = bfd_make_section (dynobj, ".rela.got");
2426 if (srelgot == NULL
2427 || !bfd_set_section_flags (dynobj, srelgot,
2428 (SEC_ALLOC
2429 | SEC_LOAD
2430 | SEC_HAS_CONTENTS
2431 | SEC_IN_MEMORY
2432 | SEC_LINKER_CREATED
2433 | SEC_READONLY))
2434 || !bfd_set_section_alignment (dynobj, srelgot, 2))
2435 return false;
2436 }
2437 }
2438
2439 if (h != NULL)
2440 {
2441 if (h->got.refcount == 0)
2442 {
2443 /* Make sure this symbol is output as a dynamic symbol. */
2444 if (h->dynindx == -1)
2445 {
2446 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
2447 return false;
2448 }
2449
2450 /* Allocate space in the .got section. */
2451 sgot->_raw_size += 4;
2452 /* Allocate relocation space. */
2453 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2454 }
2455 h->got.refcount++;
2456 }
2457 else
2458 {
2459 /* This is a global offset table entry for a local symbol. */
2460 if (local_got_refcounts[r_symndx] == 0)
2461 {
2462 sgot->_raw_size += 4;
2463 if (info->shared)
2464 {
2465 /* If we are generating a shared object, we need to
2466 output a R_CRIS_RELATIVE reloc so that the dynamic
2467 linker can adjust this GOT entry. */
2468 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2469 }
2470 }
2471 local_got_refcounts[r_symndx]++;
2472 }
2473 break;
2474
2475 case R_CRIS_32_GOTREL:
2476 /* This reference requires a global offset table.
2477 FIXME: The actual refcount isn't used currently; the .got
2478 section can't be removed if there were any references in the
2479 input. */
2480 local_got_refcounts[-1]++;
2481 break;
2482
2483 handle_gotplt_reloc:
2484
2485 case R_CRIS_32_PLT_GOTREL:
2486 /* This reference requires a global offset table. */
2487 local_got_refcounts[-1]++;
2488 /* Fall through. */
2489
2490 case R_CRIS_32_PLT_PCREL:
2491 /* This symbol requires a procedure linkage table entry. We
2492 actually build the entry in adjust_dynamic_symbol,
2493 because this might be a case of linking PIC code which is
2494 never referenced by a dynamic object, in which case we
2495 don't need to generate a procedure linkage table entry
2496 after all. */
2497
2498 /* If this is a local symbol, we resolve it directly without
2499 creating a procedure linkage table entry. */
2500 if (h == NULL)
2501 continue;
2502
2503 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
2504 h->plt.refcount++;
2505 break;
2506
2507 case R_CRIS_8:
2508 case R_CRIS_16:
2509 case R_CRIS_32:
2510 /* Let's help debug shared library creation. Any of these
2511 relocs can be used in shared libs, but pages containing them
2512 cannot be shared. Don't warn for sections we don't care
2513 about, such as debug sections or non-constant sections. We
2514 can't help tables of (global) function pointers, for example,
2515 though they must be emitted in a data section to avoid having
2516 impure text sections. */
2517 if (info->shared
2518 && (sec->flags & SEC_ALLOC) != 0
2519 && (sec->flags & SEC_READONLY) != 0)
2520 {
2521 /* FIXME: How do we make this optionally a warning only? */
2522 (*_bfd_error_handler)
2523 (_("%s, section %s:\n relocation %s should not be used in a shared object; recompile with -fPIC"),
2524 bfd_archive_filename (abfd),
2525 sec->name,
2526 cris_elf_howto_table[r_type].name);
2527 }
2528 /* Fall through. */
2529
2530 case R_CRIS_8_PCREL:
2531 case R_CRIS_16_PCREL:
2532 case R_CRIS_32_PCREL:
2533 if (h != NULL)
2534 {
2535 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
2536
2537 /* Make sure a plt entry is created for this symbol if it
2538 turns out to be a function defined by a dynamic object. */
2539 h->plt.refcount++;
2540 }
2541
2542 /* If we are creating a shared library and this is not a local
2543 symbol, we need to copy the reloc into the shared library.
2544 However when linking with -Bsymbolic and this is a global
2545 symbol which is defined in an object we are including in the
2546 link (i.e., DEF_REGULAR is set), then we can resolve the
2547 reloc directly. At this point we have not seen all the input
2548 files, so it is possible that DEF_REGULAR is not set now but
2549 will be set later (it is never cleared). In case of a weak
2550 definition, DEF_REGULAR may be cleared later by a strong
2551 definition in a shared library. We account for that
2552 possibility below by storing information in the relocs_copied
2553 field of the hash table entry. A similar situation occurs
2554 when creating shared libraries and symbol visibility changes
2555 render the symbol local. */
2556
2557 /* No need to do anything if we're not creating a shared object. */
2558 if (! info->shared)
2559 break;
2560
2561 /* We don't need to handle relocs into sections not going into
2562 the "real" output. */
2563 if ((sec->flags & SEC_ALLOC) == 0)
2564 break;
2565
2566 /* We can only eliminate PC-relative relocs. */
2567 if (r_type == R_CRIS_8_PCREL
2568 || r_type == R_CRIS_16_PCREL
2569 || r_type == R_CRIS_32_PCREL)
2570 {
2571 /* If the symbol is local, then we can eliminate the reloc. */
2572 if (h == NULL)
2573 break;
2574
2575 /* If this is with -Bsymbolic and the symbol isn't weak, and
2576 is defined by an ordinary object (the ones we include in
2577 this shared library) then we can also eliminate the
2578 reloc. See comment above for more eliminable cases which
2579 we can't identify at this time. */
2580 if (info->symbolic
2581 && h->root.type != bfd_link_hash_defweak
2582 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
2583 break;
2584 }
2585
2586 /* We create a reloc section in dynobj and make room for this
2587 reloc. */
2588 if (sreloc == NULL)
2589 {
2590 const char *name;
2591
2592 name = (bfd_elf_string_from_elf_section
2593 (abfd,
2594 elf_elfheader (abfd)->e_shstrndx,
2595 elf_section_data (sec)->rel_hdr.sh_name));
2596 if (name == NULL)
2597 return false;
2598
2599 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
2600 && strcmp (bfd_get_section_name (abfd, sec),
2601 name + 5) == 0);
2602
2603 sreloc = bfd_get_section_by_name (dynobj, name);
2604 if (sreloc == NULL)
2605 {
2606 sreloc = bfd_make_section (dynobj, name);
2607 if (sreloc == NULL
2608 || !bfd_set_section_flags (dynobj, sreloc,
2609 (SEC_ALLOC
2610 | SEC_LOAD
2611 | SEC_HAS_CONTENTS
2612 | SEC_IN_MEMORY
2613 | SEC_LINKER_CREATED
2614 | SEC_READONLY))
2615 || !bfd_set_section_alignment (dynobj, sreloc, 2))
2616 return false;
2617 }
2618 if (sec->flags & SEC_READONLY)
2619 info->flags |= DF_TEXTREL;
2620 }
2621
2622 sreloc->_raw_size += sizeof (Elf32_External_Rela);
2623
2624 /* If we are linking with -Bsymbolic, we count the number of PC
2625 relative relocations we have entered for this symbol, so that
2626 we can discard them again if the symbol is later defined by a
2627 regular object. We know that h is really a pointer to an
2628 elf_cris_link_hash_entry. */
2629 if ((r_type == R_CRIS_8_PCREL
2630 || r_type == R_CRIS_16_PCREL
2631 || r_type == R_CRIS_32_PCREL)
2632 && info->symbolic)
2633 {
2634 struct elf_cris_link_hash_entry *eh;
2635 struct elf_cris_pcrel_relocs_copied *p;
2636
2637 eh = (struct elf_cris_link_hash_entry *) h;
2638
2639 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
2640 if (p->section == sreloc)
2641 break;
2642
2643 if (p == NULL)
2644 {
2645 p = ((struct elf_cris_pcrel_relocs_copied *)
2646 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
2647 if (p == NULL)
2648 return false;
2649 p->next = eh->pcrel_relocs_copied;
2650 eh->pcrel_relocs_copied = p;
2651 p->section = sreloc;
2652 p->count = 0;
2653 }
2654
2655 ++p->count;
2656 }
2657 break;
2658
2659 /* This relocation describes the C++ object vtable hierarchy.
2660 Reconstruct it for later use during GC. */
2661 case R_CRIS_GNU_VTINHERIT:
2662 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2663 return false;
2664 break;
2665
2666 /* This relocation describes which C++ vtable entries are actually
2667 used. Record for later use during GC. */
2668 case R_CRIS_GNU_VTENTRY:
2669 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2670 return false;
2671 break;
2672
2673 default:
2674 /* Other relocs do not appear here. */
2675 bfd_set_error (bfd_error_bad_value);
2676 return false;
2677 }
2678 }
2679
2680 return true;
2681 }
2682
2683 /* Set the sizes of the dynamic sections. */
2684
2685 static boolean
2686 elf_cris_size_dynamic_sections (output_bfd, info)
2687 bfd *output_bfd ATTRIBUTE_UNUSED;
2688 struct bfd_link_info *info;
2689 {
2690 bfd *dynobj;
2691 asection *s;
2692 boolean plt;
2693 boolean relocs;
2694
2695 dynobj = elf_hash_table (info)->dynobj;
2696 BFD_ASSERT (dynobj != NULL);
2697
2698 if (elf_hash_table (info)->dynamic_sections_created)
2699 {
2700 /* Set the contents of the .interp section to the interpreter. */
2701 if (!info->shared)
2702 {
2703 s = bfd_get_section_by_name (dynobj, ".interp");
2704 BFD_ASSERT (s != NULL);
2705 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
2706 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2707 }
2708 }
2709 else
2710 {
2711 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */
2712 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2713 elf_cris_adjust_gotplt_to_got,
2714 (PTR) info);
2715
2716 /* We may have created entries in the .rela.got section.
2717 However, if we are not creating the dynamic sections, we will
2718 not actually use these entries. Reset the size of .rela.got,
2719 which will cause it to get stripped from the output file
2720 below. */
2721 s = bfd_get_section_by_name (dynobj, ".rela.got");
2722 if (s != NULL)
2723 s->_raw_size = 0;
2724 }
2725
2726 /* If this is a -Bsymbolic shared link, then we need to discard all PC
2727 relative relocs against symbols defined in a regular object. We
2728 allocated space for them in the check_relocs routine, but we will not
2729 fill them in in the relocate_section routine. We also discard space
2730 for relocs that have become for local symbols due to symbol
2731 visibility changes. For programs, we discard space for relocs for
2732 symbols not referenced by any dynamic object. */
2733 if (info->shared)
2734 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2735 elf_cris_discard_excess_dso_dynamics,
2736 (PTR) info);
2737 else
2738 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2739 elf_cris_discard_excess_program_dynamics,
2740 (PTR) info);
2741
2742 /* The check_relocs and adjust_dynamic_symbol entry points have
2743 determined the sizes of the various dynamic sections. Allocate
2744 memory for them. */
2745 plt = false;
2746 relocs = false;
2747 for (s = dynobj->sections; s != NULL; s = s->next)
2748 {
2749 const char *name;
2750 boolean strip;
2751
2752 if ((s->flags & SEC_LINKER_CREATED) == 0)
2753 continue;
2754
2755 /* It's OK to base decisions on the section name, because none
2756 of the dynobj section names depend upon the input files. */
2757 name = bfd_get_section_name (dynobj, s);
2758
2759 strip = false;
2760
2761 if (strcmp (name, ".plt") == 0)
2762 {
2763 if (s->_raw_size == 0)
2764 {
2765 /* Strip this section if we don't need it; see the
2766 comment below. */
2767 strip = true;
2768 }
2769 else
2770 {
2771 /* Remember whether there is a PLT. */
2772 plt = true;
2773 }
2774 }
2775 else if (strncmp (name, ".rela", 5) == 0)
2776 {
2777 if (s->_raw_size == 0)
2778 {
2779 /* If we don't need this section, strip it from the
2780 output file. This is mostly to handle .rela.bss and
2781 .rela.plt. We must create both sections in
2782 create_dynamic_sections, because they must be created
2783 before the linker maps input sections to output
2784 sections. The linker does that before
2785 adjust_dynamic_symbol is called, and it is that
2786 function which decides whether anything needs to go
2787 into these sections. */
2788 strip = true;
2789 }
2790 else
2791 {
2792 /* Remember whether there are any reloc sections other
2793 than .rela.plt. */
2794 if (strcmp (name, ".rela.plt") != 0)
2795 relocs = true;
2796
2797 /* We use the reloc_count field as a counter if we need
2798 to copy relocs into the output file. */
2799 s->reloc_count = 0;
2800 }
2801 }
2802 else if (strncmp (name, ".got", 4) != 0)
2803 {
2804 /* It's not one of our sections, so don't allocate space. */
2805 continue;
2806 }
2807
2808 if (strip)
2809 {
2810 _bfd_strip_section_from_output (info, s);
2811 continue;
2812 }
2813
2814 /* Allocate memory for the section contents. We use bfd_zalloc here
2815 in case unused entries are not reclaimed before the section's
2816 contents are written out. This should not happen, but this way
2817 if it does, we will not write out garbage. For reloc sections,
2818 this will make entries have the type R_CRIS_NONE. */
2819 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
2820 if (s->contents == NULL && s->_raw_size != 0)
2821 return false;
2822 }
2823
2824 if (elf_hash_table (info)->dynamic_sections_created)
2825 {
2826 /* Add some entries to the .dynamic section. We fill in the
2827 values later, in elf_cris_finish_dynamic_sections, but we
2828 must add the entries now so that we get the correct size for
2829 the .dynamic section. The DT_DEBUG entry is filled in by the
2830 dynamic linker and used by the debugger. */
2831 #define add_dynamic_entry(TAG, VAL) \
2832 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
2833
2834 if (!info->shared)
2835 {
2836 if (!add_dynamic_entry (DT_DEBUG, 0))
2837 return false;
2838 }
2839
2840 if (plt)
2841 {
2842 if (!add_dynamic_entry (DT_PLTGOT, 0)
2843 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2844 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2845 || !add_dynamic_entry (DT_JMPREL, 0))
2846 return false;
2847 }
2848
2849 if (relocs)
2850 {
2851 if (!add_dynamic_entry (DT_RELA, 0)
2852 || !add_dynamic_entry (DT_RELASZ, 0)
2853 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2854 return false;
2855 }
2856
2857 if ((info->flags & DF_TEXTREL) != 0)
2858 {
2859 if (!add_dynamic_entry (DT_TEXTREL, 0))
2860 return false;
2861 info->flags |= DF_TEXTREL;
2862 }
2863 }
2864 #undef add_dynamic_entry
2865
2866 return true;
2867 }
2868
2869 /* This function is called via elf_cris_link_hash_traverse if we are
2870 creating a shared object. In the -Bsymbolic case, it discards the
2871 space allocated to copy PC relative relocs against symbols which
2872 are defined in regular objects. For the normal non-symbolic case,
2873 we also discard space for relocs that have become local due to
2874 symbol visibility changes. We allocated space for them in the
2875 check_relocs routine, but we won't fill them in in the
2876 relocate_section routine. */
2877
2878 static boolean
2879 elf_cris_discard_excess_dso_dynamics (h, inf)
2880 struct elf_cris_link_hash_entry *h;
2881 PTR inf;
2882 {
2883 struct elf_cris_pcrel_relocs_copied *s;
2884 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2885
2886 /* If a symbol has been forced local or we have found a regular
2887 definition for the symbolic link case, then we won't be needing
2888 any relocs. */
2889 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
2890 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
2891 || info->symbolic))
2892 {
2893 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
2894 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
2895 }
2896
2897 return true;
2898 }
2899
2900 /* This function is called via elf_cris_link_hash_traverse if we are *not*
2901 creating a shared object. We discard space for relocs for symbols put
2902 in the .got, but which we found we do not have to resolve at run-time. */
2903
2904 static boolean
2905 elf_cris_discard_excess_program_dynamics (h, inf)
2906 struct elf_cris_link_hash_entry *h;
2907 PTR inf;
2908 {
2909 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2910
2911 /* If we're not creating a shared library and have a symbol which is
2912 referred to by .got references, but the symbol is defined locally,
2913 (or rather, not referred to by a DSO and not defined by a DSO) then
2914 lose the reloc for the .got (don't allocate room for it). */
2915 if ((h->root.elf_link_hash_flags
2916 & (ELF_LINK_HASH_REF_DYNAMIC | ELF_LINK_HASH_DEF_DYNAMIC)) == 0)
2917 {
2918 if (h->root.got.refcount > 0
2919 /* The size of this section is only valid and in sync with the
2920 various reference counts if we do dynamic; don't decrement it
2921 otherwise. */
2922 && elf_hash_table (info)->dynamic_sections_created)
2923 {
2924 bfd *dynobj = elf_hash_table (info)->dynobj;
2925 asection *srelgot;
2926
2927 BFD_ASSERT (dynobj != NULL);
2928
2929 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2930
2931 BFD_ASSERT (srelgot != NULL);
2932
2933 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
2934 }
2935
2936 /* If the locally-defined symbol isn't used by a DSO, then we don't
2937 have to export it as a dynamic symbol. This was already done for
2938 functions; doing this for all symbols would presumably not
2939 introduce new problems. */
2940 h->root.dynindx = -1;
2941 }
2942
2943 return true;
2944 }
2945
2946 /* Reject a file depending on presence and expectation of prefixed
2947 underscores on symbols. */
2948
2949 static boolean
2950 cris_elf_object_p (abfd)
2951 bfd *abfd;
2952 {
2953 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE))
2954 return (bfd_get_symbol_leading_char (abfd) == '_');
2955 else
2956 return (bfd_get_symbol_leading_char (abfd) == 0);
2957 }
2958
2959 /* Mark presence or absence of leading underscore. */
2960
2961 static void
2962 cris_elf_final_write_processing (abfd, linker)
2963 bfd *abfd;
2964 boolean linker ATTRIBUTE_UNUSED;
2965 {
2966 if (bfd_get_symbol_leading_char (abfd) == '_')
2967 elf_elfheader (abfd)->e_flags |= EF_CRIS_UNDERSCORE;
2968 else
2969 elf_elfheader (abfd)->e_flags &= ~EF_CRIS_UNDERSCORE;
2970 }
2971
2972 /* Display the flags field. */
2973
2974 static boolean
2975 cris_elf_print_private_bfd_data (abfd, ptr)
2976 bfd *abfd;
2977 PTR ptr;
2978 {
2979 FILE *file = (FILE *) ptr;
2980
2981 BFD_ASSERT (abfd != NULL && ptr != NULL)
2982
2983 _bfd_elf_print_private_bfd_data (abfd, ptr);
2984
2985 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
2986
2987 if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)
2988 fprintf (file, _(" [symbols have a _ prefix]"));
2989
2990 fputc ('\n', file);
2991 return true;
2992 }
2993
2994 /* Don't mix files with and without a leading underscore. */
2995
2996 static boolean
2997 cris_elf_merge_private_bfd_data (ibfd, obfd)
2998 bfd *ibfd;
2999 bfd *obfd;
3000 {
3001 flagword old_flags, new_flags;
3002
3003 if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
3004 return false;
3005
3006 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
3007 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
3008 return true;
3009
3010 if (! elf_flags_init (obfd))
3011 {
3012 /* This happens when ld starts out with a 'blank' output file. */
3013 elf_flags_init (obfd) = true;
3014
3015 /* Set flags according to current bfd_target. */
3016 cris_elf_final_write_processing (obfd, false);
3017 }
3018
3019 old_flags = elf_elfheader (obfd)->e_flags;
3020 new_flags = elf_elfheader (ibfd)->e_flags;
3021
3022 /* Is this good or bad? We'll follow with other excluding flags. */
3023 if ((old_flags & EF_CRIS_UNDERSCORE) != (new_flags & EF_CRIS_UNDERSCORE))
3024 {
3025 (*_bfd_error_handler)
3026 ((new_flags & EF_CRIS_UNDERSCORE)
3027 ? _("%s: uses _-prefixed symbols, but writing file with non-prefixed symbols")
3028 : _("%s: uses non-prefixed symbols, but writing file with _-prefixed symbols"),
3029 bfd_archive_filename (ibfd));
3030 bfd_set_error (bfd_error_bad_value);
3031 return false;
3032 }
3033
3034 return true;
3035 }
3036
3037
3038 static enum elf_reloc_type_class
3039 elf_cris_reloc_type_class (rela)
3040 const Elf_Internal_Rela *rela;
3041 {
3042 switch ((int) ELF32_R_TYPE (rela->r_info))
3043 {
3044 case R_CRIS_RELATIVE:
3045 return reloc_class_relative;
3046 case R_CRIS_JUMP_SLOT:
3047 return reloc_class_plt;
3048 case R_CRIS_COPY:
3049 return reloc_class_copy;
3050 default:
3051 return reloc_class_normal;
3052 }
3053 }
3054 \f
3055 #define ELF_ARCH bfd_arch_cris
3056 #define ELF_MACHINE_CODE EM_CRIS
3057 #define ELF_MAXPAGESIZE 0x2000
3058
3059 #define TARGET_LITTLE_SYM bfd_elf32_cris_vec
3060 #define TARGET_LITTLE_NAME "elf32-cris"
3061 #define elf_symbol_leading_char 0
3062
3063 #define elf_info_to_howto_rel NULL
3064 #define elf_info_to_howto cris_info_to_howto_rela
3065 #define elf_backend_relocate_section cris_elf_relocate_section
3066 #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook
3067 #define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook
3068 #define elf_backend_check_relocs cris_elf_check_relocs
3069 #define elf_backend_grok_prstatus cris_elf_grok_prstatus
3070 #define elf_backend_grok_psinfo cris_elf_grok_psinfo
3071
3072 #define elf_backend_can_gc_sections 1
3073 #define elf_backend_can_refcount 1
3074
3075 #define elf_backend_object_p cris_elf_object_p
3076 #define elf_backend_final_write_processing \
3077 cris_elf_final_write_processing
3078 #define bfd_elf32_bfd_print_private_bfd_data \
3079 cris_elf_print_private_bfd_data
3080 #define bfd_elf32_bfd_merge_private_bfd_data \
3081 cris_elf_merge_private_bfd_data
3082
3083 #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup
3084
3085 #define bfd_elf32_bfd_link_hash_table_create \
3086 elf_cris_link_hash_table_create
3087 #define elf_backend_adjust_dynamic_symbol \
3088 elf_cris_adjust_dynamic_symbol
3089 #define elf_backend_size_dynamic_sections \
3090 elf_cris_size_dynamic_sections
3091 #define elf_backend_finish_dynamic_symbol \
3092 elf_cris_finish_dynamic_symbol
3093 #define elf_backend_finish_dynamic_sections \
3094 elf_cris_finish_dynamic_sections
3095 #define elf_backend_create_dynamic_sections \
3096 _bfd_elf_create_dynamic_sections
3097 #define bfd_elf32_bfd_final_link \
3098 _bfd_elf32_gc_common_final_link
3099 #define elf_backend_hide_symbol elf_cris_hide_symbol
3100 #define elf_backend_reloc_type_class elf_cris_reloc_type_class
3101
3102 #define elf_backend_want_got_plt 1
3103 #define elf_backend_plt_readonly 1
3104 #define elf_backend_want_plt_sym 0
3105 #define elf_backend_got_header_size 12
3106 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
3107
3108 /* Later, we my want to optimize RELA entries into REL entries for dynamic
3109 linking and libraries (if it's a win of any significance). Until then,
3110 take the easy route. */
3111 #define elf_backend_may_use_rel_p 0
3112 #define elf_backend_may_use_rela_p 1
3113
3114 #include "elf32-target.h"
3115
3116 #define INCLUDED_TARGET_FILE
3117
3118 #undef TARGET_LITTLE_SYM
3119 #undef TARGET_LITTLE_NAME
3120 #undef elf_symbol_leading_char
3121
3122 #define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec
3123 #define TARGET_LITTLE_NAME "elf32-us-cris"
3124 #define elf_symbol_leading_char '_'
3125
3126 #include "elf32-target.h"
GDB Binutils - Deliverables
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