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Touches most files in bfd/, so likely will be blamed for everything..
[binutils.git] / bfd / elf32-cris.c
blobeb9a6f4b0964559d6aa34ec38605bc24311bbe6b
1 /* CRIS-specific support for 32-bit ELF.
2 Copyright 2000, 2001 Free Software Foundation, Inc.
3 Contributed by Axis Communications AB.
4 Written by Hans-Peter Nilsson, based on elf32-fr30.c
5 PIC and shlib bits based primarily on elf32-m68k.c and elf32-i386.c.
6
7 This file is part of BFD, the Binary File Descriptor library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/cris.h"
28
29 /* Forward declarations. */
30 static reloc_howto_type * cris_reloc_type_lookup
31 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
32
33 static void cris_info_to_howto_rela
34 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
35
36 static boolean cris_elf_relocate_section
37 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
38 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
39
40 static bfd_reloc_status_type cris_final_link_relocate
41 PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
42 Elf_Internal_Rela *, bfd_vma));
43
44 static boolean cris_elf_gc_sweep_hook
45 PARAMS ((bfd *, struct bfd_link_info *, asection *,
46 const Elf_Internal_Rela *));
47
48 static asection * cris_elf_gc_mark_hook
49 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
50 struct elf_link_hash_entry *, Elf_Internal_Sym *));
51
52 static boolean cris_elf_object_p PARAMS ((bfd *));
53
54 static void cris_elf_final_write_processing PARAMS ((bfd *, boolean));
55
56 static boolean cris_elf_print_private_bfd_data PARAMS ((bfd *, PTR));
57
58 static boolean cris_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
59
60 struct elf_cris_link_hash_entry;
61 static boolean elf_cris_discard_excess_dso_dynamics
62 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
63 static boolean elf_cris_discard_excess_program_dynamics
64 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
65 static boolean elf_cris_adjust_gotplt_to_got
66 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
67 static boolean elf_cris_try_fold_plt_to_got
68 PARAMS ((struct elf_cris_link_hash_entry *, PTR));
69 static struct bfd_hash_entry *elf_cris_link_hash_newfunc
70 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
71 static struct bfd_link_hash_table *elf_cris_link_hash_table_create
72 PARAMS ((bfd *));
73 static boolean elf_cris_adjust_dynamic_symbol
74 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
75 static boolean cris_elf_check_relocs
76 PARAMS ((bfd *, struct bfd_link_info *, asection *,
77 const Elf_Internal_Rela *));
78
79 static boolean elf_cris_size_dynamic_sections
80 PARAMS ((bfd *, struct bfd_link_info *));
81 static boolean elf_cris_finish_dynamic_symbol
82 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
83 Elf_Internal_Sym *));
84 static boolean elf_cris_finish_dynamic_sections
85 PARAMS ((bfd *, struct bfd_link_info *));
86 static void elf_cris_hide_symbol
87 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
88 static enum elf_reloc_type_class elf_cris_reloc_type_class
89 PARAMS ((int));
90
91 static reloc_howto_type cris_elf_howto_table [] =
92 {
93 /* This reloc does nothing. */
94 HOWTO (R_CRIS_NONE, /* type */
95 0, /* rightshift */
96 2, /* size (0 = byte, 1 = short, 2 = long) */
97 32, /* bitsize */
98 false, /* pc_relative */
99 0, /* bitpos */
100 complain_overflow_bitfield, /* complain_on_overflow */
101 bfd_elf_generic_reloc, /* special_function */
102 "R_CRIS_NONE", /* name */
103 false, /* partial_inplace */
104 0, /* src_mask */
105 0, /* dst_mask */
106 false), /* pcrel_offset */
107
108 /* An 8 bit absolute relocation. */
109 HOWTO (R_CRIS_8, /* type */
110 0, /* rightshift */
111 0, /* size (0 = byte, 1 = short, 2 = long) */
112 8, /* bitsize */
113 false, /* pc_relative */
114 0, /* bitpos */
115 complain_overflow_bitfield, /* complain_on_overflow */
116 bfd_elf_generic_reloc, /* special_function */
117 "R_CRIS_8", /* name */
118 false, /* partial_inplace */
119 0x0000, /* src_mask */
120 0x00ff, /* dst_mask */
121 false), /* pcrel_offset */
122
123 /* A 16 bit absolute relocation. */
124 HOWTO (R_CRIS_16, /* type */
125 0, /* rightshift */
126 1, /* size (0 = byte, 1 = short, 2 = long) */
127 16, /* bitsize */
128 false, /* pc_relative */
129 0, /* bitpos */
130 complain_overflow_bitfield, /* complain_on_overflow */
131 bfd_elf_generic_reloc, /* special_function */
132 "R_CRIS_16", /* name */
133 false, /* partial_inplace */
134 0x00000000, /* src_mask */
135 0x0000ffff, /* dst_mask */
136 false), /* pcrel_offset */
137
138 /* A 32 bit absolute relocation. */
139 HOWTO (R_CRIS_32, /* type */
140 0, /* rightshift */
141 2, /* size (0 = byte, 1 = short, 2 = long) */
142 32, /* bitsize */
143 false, /* pc_relative */
144 0, /* bitpos */
145 complain_overflow_bitfield, /* complain_on_overflow */
146 bfd_elf_generic_reloc, /* special_function */
147 "R_CRIS_32", /* name */
148 false, /* partial_inplace */
149 0x00000000, /* src_mask */
150 0xffffffff, /* dst_mask */
151 false), /* pcrel_offset */
152
153 /* An 8 bit PC-relative relocation. */
154 HOWTO (R_CRIS_8_PCREL, /* type */
155 0, /* rightshift */
156 0, /* size (0 = byte, 1 = short, 2 = long) */
157 8, /* bitsize */
158 true, /* pc_relative */
159 0, /* bitpos */
160 complain_overflow_bitfield, /* complain_on_overflow */
161 bfd_elf_generic_reloc, /* special_function */
162 "R_CRIS_8_PCREL", /* name */
163 false, /* partial_inplace */
164 0x0000, /* src_mask */
165 0x00ff, /* dst_mask */
166 true), /* pcrel_offset */
167
168 /* A 16 bit PC-relative relocation. */
169 HOWTO (R_CRIS_16_PCREL, /* type */
170 0, /* rightshift */
171 1, /* size (0 = byte, 1 = short, 2 = long) */
172 16, /* bitsize */
173 true, /* pc_relative */
174 0, /* bitpos */
175 complain_overflow_bitfield, /* complain_on_overflow */
176 bfd_elf_generic_reloc, /* special_function */
177 "R_CRIS_16", /* name */
178 false, /* partial_inplace */
179 0x00000000, /* src_mask */
180 0x0000ffff, /* dst_mask */
181 true), /* pcrel_offset */
182
183 /* A 32 bit PC-relative relocation. */
184 HOWTO (R_CRIS_32_PCREL, /* type */
185 0, /* rightshift */
186 2, /* size (0 = byte, 1 = short, 2 = long) */
187 32, /* bitsize */
188 true, /* pc_relative */
189 0, /* bitpos */
190 complain_overflow_bitfield, /* complain_on_overflow */
191 bfd_elf_generic_reloc, /* special_function */
192 "R_CRIS_32", /* name */
193 false, /* partial_inplace */
194 0x00000000, /* src_mask */
195 0xffffffff, /* dst_mask */
196 true), /* pcrel_offset */
197
198 /* GNU extension to record C++ vtable hierarchy. */
199 HOWTO (R_CRIS_GNU_VTINHERIT, /* type */
200 0, /* rightshift */
201 2, /* size (0 = byte, 1 = short, 2 = long) */
202 0, /* bitsize */
203 false, /* pc_relative */
204 0, /* bitpos */
205 complain_overflow_dont, /* complain_on_overflow */
206 NULL, /* special_function */
207 "R_CRIS_GNU_VTINHERIT", /* name */
208 false, /* partial_inplace */
209 0, /* src_mask */
210 0, /* dst_mask */
211 false), /* pcrel_offset */
212
213 /* GNU extension to record C++ vtable member usage. */
214 HOWTO (R_CRIS_GNU_VTENTRY, /* type */
215 0, /* rightshift */
216 2, /* size (0 = byte, 1 = short, 2 = long) */
217 0, /* bitsize */
218 false, /* pc_relative */
219 0, /* bitpos */
220 complain_overflow_dont, /* complain_on_overflow */
221 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
222 "R_CRIS_GNU_VTENTRY", /* name */
223 false, /* partial_inplace */
224 0, /* src_mask */
225 0, /* dst_mask */
226 false), /* pcrel_offset */
227
228 /* This is used only by the dynamic linker. The symbol should exist
229 both in the object being run and in some shared library. The
230 dynamic linker copies the data addressed by the symbol from the
231 shared library into the object, because the object being
232 run has to have the data at some particular address. */
233 HOWTO (R_CRIS_COPY, /* type */
234 0, /* rightshift */
235 2, /* size (0 = byte, 1 = short, 2 = long) */
236 32, /* bitsize */
237 false, /* pc_relative */
238 0, /* bitpos */
239 complain_overflow_bitfield, /* complain_on_overflow */
240 bfd_elf_generic_reloc, /* special_function */
241 "R_CRIS_COPY", /* name */
242 false, /* partial_inplace */
243 0, /* src_mask */
244 0, /* dst_mask */
245 false), /* pcrel_offset */
246
247 /* Like R_CRIS_32, but used when setting global offset table entries. */
248 HOWTO (R_CRIS_GLOB_DAT, /* type */
249 0, /* rightshift */
250 2, /* size (0 = byte, 1 = short, 2 = long) */
251 32, /* bitsize */
252 false, /* pc_relative */
253 0, /* bitpos */
254 complain_overflow_bitfield, /* complain_on_overflow */
255 bfd_elf_generic_reloc, /* special_function */
256 "R_CRIS_GLOB_DAT", /* name */
257 false, /* partial_inplace */
258 0, /* src_mask */
259 0xffffffff, /* dst_mask */
260 false), /* pcrel_offset */
261
262 /* Marks a procedure linkage table entry for a symbol. */
263 HOWTO (R_CRIS_JUMP_SLOT, /* type */
264 0, /* rightshift */
265 2, /* size (0 = byte, 1 = short, 2 = long) */
266 32, /* bitsize */
267 false, /* pc_relative */
268 0, /* bitpos */
269 complain_overflow_bitfield, /* complain_on_overflow */
270 bfd_elf_generic_reloc, /* special_function */
271 "R_CRIS_JUMP_SLOT", /* name */
272 false, /* partial_inplace */
273 0, /* src_mask */
274 0, /* dst_mask */
275 false), /* pcrel_offset */
276
277 /* Used only by the dynamic linker. When the object is run, this
278 longword is set to the load address of the object, plus the
279 addend. */
280 HOWTO (R_CRIS_RELATIVE, /* type */
281 0, /* rightshift */
282 2, /* size (0 = byte, 1 = short, 2 = long) */
283 32, /* bitsize */
284 false, /* pc_relative */
285 0, /* bitpos */
286 complain_overflow_bitfield, /* complain_on_overflow */
287 bfd_elf_generic_reloc, /* special_function */
288 "R_CRIS_RELATIVE", /* name */
289 false, /* partial_inplace */
290 0, /* src_mask */
291 0xffffffff, /* dst_mask */
292 false), /* pcrel_offset */
293
294 /* Like R_CRIS_32, but referring to the GOT table entry for the symbol. */
295 HOWTO (R_CRIS_16_GOT, /* type */
296 0, /* rightshift */
297 1, /* size (0 = byte, 1 = short, 2 = long) */
298 16, /* bitsize */
299 false, /* pc_relative */
300 0, /* bitpos */
301 complain_overflow_bitfield, /* complain_on_overflow */
302 bfd_elf_generic_reloc, /* special_function */
303 "R_CRIS_16_GOT", /* name */
304 false, /* partial_inplace */
305 0, /* src_mask */
306 0xffff, /* dst_mask */
307 false), /* pcrel_offset */
308
309 HOWTO (R_CRIS_32_GOT, /* type */
310 0, /* rightshift */
311 2, /* size (0 = byte, 1 = short, 2 = long) */
312 32, /* bitsize */
313 false, /* pc_relative */
314 0, /* bitpos */
315 complain_overflow_bitfield, /* complain_on_overflow */
316 bfd_elf_generic_reloc, /* special_function */
317 "R_CRIS_32_GOT", /* name */
318 false, /* partial_inplace */
319 0, /* src_mask */
320 0xffffffff, /* dst_mask */
321 false), /* pcrel_offset */
322
323 /* Like R_CRIS_32_GOT, but referring to (and requesting a) PLT part of
324 the GOT table for the symbol. */
325 HOWTO (R_CRIS_16_GOTPLT, /* type */
326 0, /* rightshift */
327 1, /* size (0 = byte, 1 = short, 2 = long) */
328 16, /* bitsize */
329 false, /* pc_relative */
330 0, /* bitpos */
331 complain_overflow_bitfield, /* complain_on_overflow */
332 bfd_elf_generic_reloc, /* special_function */
333 "R_CRIS_16_GOTPLT", /* name */
334 false, /* partial_inplace */
335 0, /* src_mask */
336 0xffff, /* dst_mask */
337 false), /* pcrel_offset */
338
339 HOWTO (R_CRIS_32_GOTPLT, /* type */
340 0, /* rightshift */
341 2, /* size (0 = byte, 1 = short, 2 = long) */
342 32, /* bitsize */
343 false, /* pc_relative */
344 0, /* bitpos */
345 complain_overflow_bitfield, /* complain_on_overflow */
346 bfd_elf_generic_reloc, /* special_function */
347 "R_CRIS_32_GOTPLT", /* name */
348 false, /* partial_inplace */
349 0, /* src_mask */
350 0xffffffff, /* dst_mask */
351 false), /* pcrel_offset */
352
353 /* A 32-bit offset from GOT to (local const) symbol: no GOT entry should
354 be necessary. */
355 HOWTO (R_CRIS_32_GOTREL, /* type */
356 0, /* rightshift */
357 2, /* size (0 = byte, 1 = short, 2 = long) */
358 32, /* bitsize */
359 false, /* pc_relative */
360 0, /* bitpos */
361 complain_overflow_bitfield, /* complain_on_overflow */
362 bfd_elf_generic_reloc, /* special_function */
363 "R_CRIS_32_GOTREL", /* name */
364 false, /* partial_inplace */
365 0, /* src_mask */
366 0xffffffff, /* dst_mask */
367 false), /* pcrel_offset */
368
369 /* A 32-bit offset from GOT to entry for this symbol in PLT and request
370 to create PLT entry for symbol. */
371 HOWTO (R_CRIS_32_PLT_GOTREL, /* type */
372 0, /* rightshift */
373 2, /* size (0 = byte, 1 = short, 2 = long) */
374 32, /* bitsize */
375 false, /* pc_relative */
376 0, /* bitpos */
377 complain_overflow_bitfield, /* complain_on_overflow */
378 bfd_elf_generic_reloc, /* special_function */
379 "R_CRIS_32_PLT_GOTREL", /* name */
380 false, /* partial_inplace */
381 0, /* src_mask */
382 0xffffffff, /* dst_mask */
383 false), /* pcrel_offset */
384
385 /* A 32-bit offset from PC (location after the relocation) + addend to
386 entry for this symbol in PLT and request to create PLT entry for
387 symbol. */
388 HOWTO (R_CRIS_32_PLT_PCREL, /* type */
389 0, /* rightshift */
390 2, /* size (0 = byte, 1 = short, 2 = long) */
391 32, /* bitsize */
392 true, /* pc_relative */
393 0, /* bitpos */
394 complain_overflow_bitfield, /* complain_on_overflow */
395 bfd_elf_generic_reloc, /* special_function */
396 "R_CRIS_32_PLT_PCREL", /* name */
397 false, /* partial_inplace */
398 0, /* src_mask */
399 0xffffffff, /* dst_mask */
400 true) /* pcrel_offset */
401 };
402 \f
403 /* Map BFD reloc types to CRIS ELF reloc types. */
404
405 struct cris_reloc_map
406 {
407 bfd_reloc_code_real_type bfd_reloc_val;
408 unsigned int cris_reloc_val;
409 };
410
411 static const struct cris_reloc_map cris_reloc_map [] =
412 {
413 { BFD_RELOC_NONE, R_CRIS_NONE },
414 { BFD_RELOC_8, R_CRIS_8 },
415 { BFD_RELOC_16, R_CRIS_16 },
416 { BFD_RELOC_32, R_CRIS_32 },
417 { BFD_RELOC_8_PCREL, R_CRIS_8_PCREL },
418 { BFD_RELOC_16_PCREL, R_CRIS_16_PCREL },
419 { BFD_RELOC_32_PCREL, R_CRIS_32_PCREL },
420 { BFD_RELOC_VTABLE_INHERIT, R_CRIS_GNU_VTINHERIT },
421 { BFD_RELOC_VTABLE_ENTRY, R_CRIS_GNU_VTENTRY },
422 { BFD_RELOC_CRIS_COPY, R_CRIS_COPY },
423 { BFD_RELOC_CRIS_GLOB_DAT, R_CRIS_GLOB_DAT },
424 { BFD_RELOC_CRIS_JUMP_SLOT, R_CRIS_JUMP_SLOT },
425 { BFD_RELOC_CRIS_RELATIVE, R_CRIS_RELATIVE },
426 { BFD_RELOC_CRIS_16_GOT, R_CRIS_16_GOT },
427 { BFD_RELOC_CRIS_32_GOT, R_CRIS_32_GOT },
428 { BFD_RELOC_CRIS_16_GOTPLT, R_CRIS_16_GOTPLT },
429 { BFD_RELOC_CRIS_32_GOTPLT, R_CRIS_32_GOTPLT },
430 { BFD_RELOC_CRIS_32_GOTREL, R_CRIS_32_GOTREL },
431 { BFD_RELOC_CRIS_32_PLT_GOTREL, R_CRIS_32_PLT_GOTREL },
432 { BFD_RELOC_CRIS_32_PLT_PCREL, R_CRIS_32_PLT_PCREL }
433 };
434
435 static reloc_howto_type *
436 cris_reloc_type_lookup (abfd, code)
437 bfd * abfd ATTRIBUTE_UNUSED;
438 bfd_reloc_code_real_type code;
439 {
440 unsigned int i;
441
442 for (i = sizeof (cris_reloc_map) / sizeof (cris_reloc_map[0]);
443 --i;)
444 if (cris_reloc_map [i].bfd_reloc_val == code)
445 return & cris_elf_howto_table [cris_reloc_map[i].cris_reloc_val];
446
447 return NULL;
448 }
449
450 /* Set the howto pointer for an CRIS ELF reloc. */
451
452 static void
453 cris_info_to_howto_rela (abfd, cache_ptr, dst)
454 bfd * abfd ATTRIBUTE_UNUSED;
455 arelent * cache_ptr;
456 Elf32_Internal_Rela * dst;
457 {
458 unsigned int r_type;
459
460 r_type = ELF32_R_TYPE (dst->r_info);
461 BFD_ASSERT (r_type < (unsigned int) R_CRIS_max);
462 cache_ptr->howto = & cris_elf_howto_table [r_type];
463 }
464 \f
465 /* The name of the dynamic interpreter. This is put in the .interp
466 section. */
467
468 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
469
470 /* The size in bytes of an entry in the procedure linkage table. */
471
472 #define PLT_ENTRY_SIZE 20
473
474 /* The first entry in an absolute procedure linkage table looks like this. */
475
476 static const bfd_byte elf_cris_plt0_entry[PLT_ENTRY_SIZE] =
477 {
478 0xfc, 0xe1,
479 0x7e, 0x7e, /* push mof. */
480 0x7f, 0x0d, /* (dip [pc+]) */
481 0, 0, 0, 0, /* Replaced with address of .got + 4. */
482 0x30, 0x7a, /* move [...],mof */
483 0x7f, 0x0d, /* (dip [pc+]) */
484 0, 0, 0, 0, /* Replaced with address of .got + 8. */
485 0x30, 0x09, /* jump [...] */
486 };
487
488 /* Subsequent entries in an absolute procedure linkage table look like
489 this. */
490
491 static const bfd_byte elf_cris_plt_entry[PLT_ENTRY_SIZE] =
492 {
493 0x7f, 0x0d, /* (dip [pc+]) */
494 0, 0, 0, 0, /* Replaced with address of this symbol in .got. */
495 0x30, 0x09, /* jump [...] */
496 0x3f, 0x7e, /* move [pc+],mof */
497 0, 0, 0, 0, /* Replaced with offset into relocation table. */
498 0x2f, 0xfe, /* add.d [pc+],pc */
499 0xec, 0xff,
500 0xff, 0xff /* Replaced with offset to start of .plt. */
501 };
502
503 /* The first entry in a PIC procedure linkage table looks like this. */
504
505 static const bfd_byte elf_cris_pic_plt0_entry[PLT_ENTRY_SIZE] =
506 {
507 0xfc, 0xe1, 0x7e, 0x7e, /* push mof */
508 0x04, 0x01, 0x30, 0x7a, /* move [r0+4],mof */
509 0x08, 0x01, 0x30, 0x09, /* jump [r0+8] */
510 0, 0, 0, 0, 0, 0, 0, 0, /* Pad out to 20 bytes. */
511 };
512
513 /* Subsequent entries in a PIC procedure linkage table look like this. */
514
515 static const bfd_byte elf_cris_pic_plt_entry[PLT_ENTRY_SIZE] =
516 {
517 0x6f, 0x0d, /* (bdap [pc+].d,r0) */
518 0, 0, 0, 0, /* Replaced with offset of this symbol in .got. */
519 0x30, 0x09, /* jump [...] */
520 0x3f, 0x7e, /* move [pc+],mof */
521 0, 0, 0, 0, /* Replaced with offset into relocation table. */
522 0x2f, 0xfe, /* add.d [pc+],pc */
523 0xec, 0xff, /* Replaced with offset to start of .plt. */
524 0xff, 0xff
525 };
526 \f
527 /* We copy elf32-m68k.c and elf32-i386.c for the basic linker hash bits
528 (and most other PIC/shlib stuff). Check that we don't drift away
529 without reason.
530
531 The CRIS linker, like the m68k and i386 linkers (and probably the rest
532 too) needs to keep track of the number of relocs that it decides to
533 copy in check_relocs for each symbol. This is so that it can discard
534 PC relative relocs if it doesn't need them when linking with
535 -Bsymbolic. We store the information in a field extending the regular
536 ELF linker hash table. */
537
538 /* This structure keeps track of the number of PC relative relocs we have
539 copied for a given symbol. */
540
541 struct elf_cris_pcrel_relocs_copied
542 {
543 /* Next section. */
544 struct elf_cris_pcrel_relocs_copied *next;
545 /* A section in dynobj. */
546 asection *section;
547 /* Number of relocs copied in this section. */
548 bfd_size_type count;
549 };
550
551 /* CRIS ELF linker hash entry. */
552
553 struct elf_cris_link_hash_entry
554 {
555 struct elf_link_hash_entry root;
556
557 /* Number of PC relative relocs copied for this symbol. */
558 struct elf_cris_pcrel_relocs_copied *pcrel_relocs_copied;
559
560 /* The GOTPLT references are CRIS-specific; the goal is to avoid having
561 both a general GOT and a PLT-specific GOT entry for the same symbol,
562 when it is referenced both as a function and as a function pointer.
563
564 Number of GOTPLT references for a function. */
565 bfd_signed_vma gotplt_refcount;
566
567 /* Actual GOTPLT index for this symbol, if applicable, or zero if not
568 (zero is never used as an index). FIXME: We should be able to fold
569 this with gotplt_refcount in a union, like the got and plt unions in
570 elf_link_hash_entry. */
571 bfd_size_type gotplt_offset;
572 };
573
574 /* CRIS ELF linker hash table. */
575
576 struct elf_cris_link_hash_table
577 {
578 struct elf_link_hash_table root;
579
580 /* We can't use the PLT offset and calculate to get the GOTPLT offset,
581 since we try and avoid creating GOTPLT:s when there's already a GOT.
582 Instead, we keep and update the next available index here. */
583 bfd_size_type next_gotplt_entry;
584 };
585
586 /* Traverse a CRIS ELF linker hash table. */
587
588 #define elf_cris_link_hash_traverse(table, func, info) \
589 (elf_link_hash_traverse \
590 (&(table)->root, \
591 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
592 (info)))
593
594 /* Get the CRIS ELF linker hash table from a link_info structure. */
595
596 #define elf_cris_hash_table(p) \
597 ((struct elf_cris_link_hash_table *) (p)->hash)
598
599 /* Create an entry in a CRIS ELF linker hash table. */
600
601 static struct bfd_hash_entry *
602 elf_cris_link_hash_newfunc (entry, table, string)
603 struct bfd_hash_entry *entry;
604 struct bfd_hash_table *table;
605 const char *string;
606 {
607 struct elf_cris_link_hash_entry *ret =
608 (struct elf_cris_link_hash_entry *) entry;
609
610 /* Allocate the structure if it has not already been allocated by a
611 subclass. */
612 if (ret == (struct elf_cris_link_hash_entry *) NULL)
613 ret = ((struct elf_cris_link_hash_entry *)
614 bfd_hash_allocate (table,
615 sizeof (struct elf_cris_link_hash_entry)));
616 if (ret == (struct elf_cris_link_hash_entry *) NULL)
617 return (struct bfd_hash_entry *) ret;
618
619 /* Call the allocation method of the superclass. */
620 ret = ((struct elf_cris_link_hash_entry *)
621 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
622 table, string));
623 if (ret != (struct elf_cris_link_hash_entry *) NULL)
624 {
625 ret->pcrel_relocs_copied = NULL;
626 ret->gotplt_refcount = 0;
627 ret->gotplt_offset = 0;
628 }
629
630 return (struct bfd_hash_entry *) ret;
631 }
632
633 /* Create a CRIS ELF linker hash table. */
634
635 static struct bfd_link_hash_table *
636 elf_cris_link_hash_table_create (abfd)
637 bfd *abfd;
638 {
639 struct elf_cris_link_hash_table *ret;
640 bfd_size_type amt = sizeof (struct elf_cris_link_hash_table);
641
642 ret = ((struct elf_cris_link_hash_table *) bfd_alloc (abfd, amt));
643 if (ret == (struct elf_cris_link_hash_table *) NULL)
644 return NULL;
645
646 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
647 elf_cris_link_hash_newfunc))
648 {
649 bfd_release (abfd, ret);
650 return NULL;
651 }
652
653 /* Initialize to skip over the first three entries in the gotplt; they
654 are used for run-time symbol evaluation. */
655 ret->next_gotplt_entry = 12;
656
657 return &ret->root.root;
658 }
659 \f
660 /* Perform a single relocation. By default we use the standard BFD
661 routines, with a few tweaks. */
662
663 static bfd_reloc_status_type
664 cris_final_link_relocate (howto, input_bfd, input_section, contents, rel,
665 relocation)
666 reloc_howto_type * howto;
667 bfd * input_bfd;
668 asection * input_section;
669 bfd_byte * contents;
670 Elf_Internal_Rela * rel;
671 bfd_vma relocation;
672 {
673 bfd_reloc_status_type r;
674
675 /* PC-relative relocations are relative to the position *after*
676 the reloc. Note that for R_CRIS_8_PCREL the adjustment is
677 not a single byte, since PC must be 16-bit-aligned. */
678 switch (ELF32_R_TYPE (rel->r_info))
679 {
680 /* Check that the 16-bit GOT relocs are positive. */
681 case R_CRIS_16_GOTPLT:
682 case R_CRIS_16_GOT:
683 if ((bfd_signed_vma) relocation < 0)
684 return bfd_reloc_overflow;
685 break;
686
687 case R_CRIS_32_PLT_PCREL:
688 case R_CRIS_32_PCREL:
689 relocation -= 2;
690 /* Fall through. */
691 case R_CRIS_8_PCREL:
692 case R_CRIS_16_PCREL:
693 relocation -= 2;
694 break;
695
696 default:
697 break;
698 }
699
700 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
701 contents, rel->r_offset,
702 relocation, rel->r_addend);
703 return r;
704 }
705 \f
706 /* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was
707 copied, for further comments. */
708
709 static boolean
710 cris_elf_relocate_section (output_bfd, info, input_bfd, input_section,
711 contents, relocs, local_syms, local_sections)
712 bfd * output_bfd ATTRIBUTE_UNUSED;
713 struct bfd_link_info * info;
714 bfd * input_bfd;
715 asection * input_section;
716 bfd_byte * contents;
717 Elf_Internal_Rela * relocs;
718 Elf_Internal_Sym * local_syms;
719 asection ** local_sections;
720 {
721 bfd *dynobj;
722 Elf_Internal_Shdr * symtab_hdr;
723 struct elf_link_hash_entry ** sym_hashes;
724 bfd_vma *local_got_offsets;
725 asection *sgot;
726 asection *splt;
727 asection *sreloc;
728 Elf_Internal_Rela * rel;
729 Elf_Internal_Rela * relend;
730
731 dynobj = elf_hash_table (info)->dynobj;
732 local_got_offsets = elf_local_got_offsets (input_bfd);
733 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
734 sym_hashes = elf_sym_hashes (input_bfd);
735 relend = relocs + input_section->reloc_count;
736
737 /* It seems this can happen with erroneous or unsupported input (mixing
738 a.out and elf in an archive, for example.) */
739 if (sym_hashes == NULL)
740 return false;
741
742 sgot = NULL;
743 splt = NULL;
744 sreloc = NULL;
745
746 if (dynobj != NULL)
747 {
748 splt = bfd_get_section_by_name (dynobj, ".plt");
749 sgot = bfd_get_section_by_name (dynobj, ".got");
750 }
751
752 for (rel = relocs; rel < relend; rel ++)
753 {
754 reloc_howto_type * howto;
755 unsigned long r_symndx;
756 Elf_Internal_Sym * sym;
757 asection * sec;
758 struct elf_link_hash_entry * h;
759 bfd_vma relocation;
760 bfd_reloc_status_type r;
761 const char * symname = NULL;
762 int r_type;
763
764 r_type = ELF32_R_TYPE (rel->r_info);
765
766 if ( r_type == R_CRIS_GNU_VTINHERIT
767 || r_type == R_CRIS_GNU_VTENTRY)
768 continue;
769
770 r_symndx = ELF32_R_SYM (rel->r_info);
771
772 if (info->relocateable)
773 {
774 /* This is a relocateable link. We don't have to change
775 anything, unless the reloc is against a section symbol,
776 in which case we have to adjust according to where the
777 section symbol winds up in the output section. */
778 if (r_symndx < symtab_hdr->sh_info)
779 {
780 sym = local_syms + r_symndx;
781
782 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
783 {
784 sec = local_sections [r_symndx];
785 rel->r_addend += sec->output_offset + sym->st_value;
786 }
787 }
788
789 continue;
790 }
791
792 /* This is a final link. */
793 howto = cris_elf_howto_table + r_type;
794 h = NULL;
795 sym = NULL;
796 sec = NULL;
797
798 if (r_symndx < symtab_hdr->sh_info)
799 {
800 sym = local_syms + r_symndx;
801 sec = local_sections [r_symndx];
802 relocation = (sec->output_section->vma
803 + sec->output_offset
804 + sym->st_value);
805
806 symname = (bfd_elf_string_from_elf_section
807 (input_bfd, symtab_hdr->sh_link, sym->st_name));
808 if (symname == NULL)
809 symname = bfd_section_name (input_bfd, sec);
810 }
811 else
812 {
813 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
814
815 while (h->root.type == bfd_link_hash_indirect
816 || h->root.type == bfd_link_hash_warning)
817 h = (struct elf_link_hash_entry *) h->root.u.i.link;
818
819 symname = h->root.root.string;
820
821 if (h->root.type == bfd_link_hash_defined
822 || h->root.type == bfd_link_hash_defweak)
823 {
824 sec = h->root.u.def.section;
825
826 /* Perhaps we should detect the cases that
827 sec->output_section is expected to be NULL like i386 and
828 m68k, but apparently (and according to elfxx-ia64.c) all
829 valid cases are where the symbol is defined in a shared
830 object which we link dynamically against. This includes
831 PLT relocs for which we've created a PLT entry and other
832 relocs for which we're prepared to create dynamic
833 relocations.
834
835 For now, new situations cause us to just err when
836 sec->output_offset is NULL but the object with the symbol
837 is *not* dynamically linked against. Thus this will
838 automatically remind us so we can see if there are other
839 valid cases we need to revisit. */
840 if ((sec->output_section == NULL
841 && (sec->owner->flags & DYNAMIC) != 0)
842
843 /* Here follow the cases where the relocation value must
844 be zero (or when further handling is simplified when
845 zero). I can't claim to understand the various
846 conditions and they weren't described in the files
847 where I copied them from (elf32-m68k.c and
848 elf32-i386.c), but let's mention examples of where
849 they happen. FIXME: Perhaps define and use a
850 dynamic_symbol_p function like ia64.
851
852 - When creating a shared library, we can have an
853 ordinary relocation for a symbol defined in a shared
854 library (perhaps the one we create). We then make
855 the relocation value zero, as the value seen now will
856 be added into the relocation addend in this shared
857 library, but must be handled only at dynamic-link
858 time. FIXME: Not sure this example covers the
859 h->elf_link_hash_flags test, though it's there in
860 other targets. */
861 || (info->shared
862 && ((! info->symbolic && h->dynindx != -1)
863 || (h->elf_link_hash_flags
864 & ELF_LINK_HASH_DEF_REGULAR) == 0)
865 && (input_section->flags & SEC_ALLOC) != 0
866 && (r_type == R_CRIS_8
867 || r_type == R_CRIS_16
868 || r_type == R_CRIS_32
869 || r_type == R_CRIS_8_PCREL
870 || r_type == R_CRIS_16_PCREL
871 || r_type == R_CRIS_32_PCREL)))
872 relocation = 0;
873 else if (sec->output_section != NULL)
874 relocation = (h->root.u.def.value
875 + sec->output_section->vma
876 + sec->output_offset);
877 else
878 {
879 if (input_bfd->my_archive)
880 (*_bfd_error_handler)
881 (_("%s(%s): unresolvable relocation %s against symbol `%s' from %s section"),
882 bfd_get_filename (bfd_my_archive (input_bfd)),
883 bfd_get_filename (input_bfd),
884 cris_elf_howto_table[r_type].name,
885 symname,
886 bfd_get_section_name (input_bfd, input_section));
887 else
888 (*_bfd_error_handler)
889 (_("%s: unresolvable relocation %s against symbol `%s' from %s section"),
890 bfd_get_filename (input_bfd),
891 cris_elf_howto_table[r_type].name,
892 symname,
893 bfd_get_section_name (input_bfd, input_section));
894 bfd_set_error (bfd_error_bad_value);
895 return false;
896 }
897 }
898 else if (h->root.type == bfd_link_hash_undefweak)
899 relocation = 0;
900 else if (info->shared
901 && !info->symbolic
902 && !info->no_undefined
903 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
904 relocation = 0;
905 else
906 {
907 if (!(info->callbacks->undefined_symbol
908 (info, symname, input_bfd,
909 input_section, rel->r_offset,
910 (!info->shared || info->no_undefined
911 || ELF_ST_VISIBILITY (h->other)))))
912 return false;
913 relocation = 0;
914 }
915 }
916
917 switch (r_type)
918 {
919 case R_CRIS_16_GOTPLT:
920 case R_CRIS_32_GOTPLT:
921 /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT,
922 but we require a PLT, and the PLT handling will take care of
923 filling in the PLT-specific GOT entry. For the GOT offset,
924 calculate it as we do when filling it in for the .got.plt
925 section. If we don't have a PLT, punt to GOT handling. */
926 if (h != NULL
927 && ((struct elf_cris_link_hash_entry *) h)->gotplt_offset != 0)
928 {
929 asection *sgotplt
930 = bfd_get_section_by_name (dynobj, ".got.plt");
931 bfd_vma got_offset;
932
933 BFD_ASSERT (h->dynindx != -1);
934 BFD_ASSERT (sgotplt != NULL);
935
936 got_offset
937 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset;
938
939 relocation = got_offset;
940 break;
941 }
942
943 /* We didn't make a PLT entry for this symbol. Maybe everything is
944 folded into the GOT. Other than folding, this happens when
945 statically linking PIC code, or when using -Bsymbolic. Check
946 that we instead have a GOT entry as done for us by
947 elf_cris_adjust_dynamic_symbol, and drop through into the
948 ordinary GOT cases. */
949 if (h != NULL && h->got.offset == (bfd_vma) -1)
950 {
951 (*_bfd_error_handler)
952 (_("%s: No PLT nor GOT for relocation %s against symbol `%s' from %s section"),
953 bfd_get_filename (input_bfd),
954 cris_elf_howto_table[r_type].name,
955 symname[0] != '\0' ? symname : _("[whose name is lost]"),
956 bfd_get_section_name (input_bfd, input_section));
957
958 /* FIXME: Perhaps blaming input is not the right thing to
959 do; this is probably an internal error. But it is true
960 that we didn't like that particular input. */
961 bfd_set_error (bfd_error_bad_value);
962 return false;
963 }
964 /* Fall through. */
965
966 /* The size of the actual relocation is not used here; we only
967 fill in the GOT table here. */
968 case R_CRIS_16_GOT:
969 case R_CRIS_32_GOT:
970 {
971 bfd_vma off;
972
973 /* Note that despite using RELA relocations, the .got contents
974 is always filled in with the link-relative relocation
975 value; the addend. */
976
977 if (h != NULL)
978 {
979 off = h->got.offset;
980 BFD_ASSERT (off != (bfd_vma) -1);
981
982 if (!elf_hash_table (info)->dynamic_sections_created
983 || (! info->shared && h->dynindx == -1)
984 || (info->shared
985 && (info->symbolic || h->dynindx == -1)
986 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
987 {
988 /* This wasn't checked above for ! info->shared, but
989 must hold there if we get here; the symbol must not
990 be used in, or defined by a DSO. (Note that
991 checking for ELF_LINK_HASH_DEF_REGULAR doesn't
992 catch all cases.) */
993 BFD_ASSERT (info->shared
994 || (h->elf_link_hash_flags
995 & (ELF_LINK_HASH_REF_DYNAMIC
996 | ELF_LINK_HASH_DEF_DYNAMIC)) == 0);
997
998 /* This is actually a static link, or it is a
999 -Bsymbolic link and the symbol is defined
1000 locally, or the symbol was forced to be local
1001 because of a version file, or we're not creating a
1002 dynamic object and the symbol isn't referred to by
1003 a dynamic object. We must initialize
1004 this entry in the global offset table. Since
1005 the offset must always be a multiple of 4, we
1006 use the least significant bit to record whether
1007 we have initialized it already.
1008
1009 When doing a dynamic link, we create a .rela.got
1010 relocation entry to initialize the value. This
1011 is done in the finish_dynamic_symbol routine. */
1012 if ((off & 1) != 0)
1013 off &= ~1;
1014 else
1015 {
1016 bfd_put_32 (output_bfd, relocation,
1017 sgot->contents + off);
1018 h->got.offset |= 1;
1019 }
1020 }
1021 }
1022 else
1023 {
1024 BFD_ASSERT (local_got_offsets != NULL
1025 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1026
1027 off = local_got_offsets[r_symndx];
1028
1029 /* The offset must always be a multiple of 4. We use
1030 the least significant bit to record whether we have
1031 already generated the necessary reloc. */
1032 if ((off & 1) != 0)
1033 off &= ~1;
1034 else
1035 {
1036 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1037
1038 if (info->shared)
1039 {
1040 asection *srelgot;
1041 Elf_Internal_Rela outrel;
1042
1043 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1044 BFD_ASSERT (srelgot != NULL);
1045
1046 outrel.r_offset = (sgot->output_section->vma
1047 + sgot->output_offset
1048 + off);
1049 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1050 outrel.r_addend = relocation;
1051 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1052 (((Elf32_External_Rela *)
1053 srelgot->contents)
1054 + srelgot->reloc_count));
1055 ++srelgot->reloc_count;
1056 }
1057
1058 local_got_offsets[r_symndx] |= 1;
1059 }
1060 }
1061
1062 relocation = sgot->output_offset + off;
1063 if (rel->r_addend != 0)
1064 {
1065 /* We can't do anything for a relocation which is against
1066 a symbol *plus offset*. GOT holds relocations for
1067 symbols. Make this an error; the compiler isn't
1068 allowed to pass us these kinds of things. */
1069 if (h == NULL)
1070 (*_bfd_error_handler)
1071 (_("%s: relocation %s with non-zero addend %d against local symbol from %s section"),
1072 bfd_get_filename (input_bfd),
1073 cris_elf_howto_table[r_type].name,
1074 rel->r_addend,
1075 bfd_get_section_name (input_bfd, input_section));
1076 else
1077 (*_bfd_error_handler)
1078 (_("%s: relocation %s with non-zero addend %d against symbol `%s' from %s section"),
1079 bfd_get_filename (input_bfd),
1080 cris_elf_howto_table[r_type].name,
1081 rel->r_addend,
1082 symname[0] != '\0' ? symname : _("[whose name is lost]"),
1083 bfd_get_section_name (input_bfd, input_section));
1084
1085 bfd_set_error (bfd_error_bad_value);
1086 return false;
1087 }
1088 }
1089 break;
1090
1091 case R_CRIS_32_GOTREL:
1092 /* This relocation must only be performed against local symbols. */
1093 if (h != NULL)
1094 {
1095 (*_bfd_error_handler)
1096 (_("%s: relocation %s is not allowed for global symbol: `%s' from %s section"),
1097 bfd_get_filename (input_bfd),
1098 cris_elf_howto_table[r_type].name,
1099 symname,
1100 bfd_get_section_name (input_bfd, input_section));
1101 bfd_set_error (bfd_error_bad_value);
1102 return false;
1103 }
1104
1105 /* This relocation is like a PC-relative one, except the
1106 reference point is the location of GOT. Note that
1107 sgot->output_offset is not involved in this calculation. We
1108 always want the start of entire .got section, not the
1109 position after the reserved header. */
1110 relocation -= sgot->output_section->vma;
1111 break;
1112
1113 case R_CRIS_32_PLT_PCREL:
1114 /* Relocation is to the entry for this symbol in the
1115 procedure linkage table. */
1116
1117 /* Resolve a PLT_PCREL reloc against a local symbol directly,
1118 without using the procedure linkage table. */
1119 if (h == NULL)
1120 break;
1121
1122 if (h->plt.offset == (bfd_vma) -1
1123 || splt == NULL)
1124 {
1125 /* We didn't make a PLT entry for this symbol. This
1126 happens when statically linking PIC code, or when
1127 using -Bsymbolic. */
1128 break;
1129 }
1130
1131 relocation = (splt->output_section->vma
1132 + splt->output_offset
1133 + h->plt.offset);
1134 break;
1135
1136 case R_CRIS_32_PLT_GOTREL:
1137 /* Like R_CRIS_32_PLT_PCREL, but the reference point is the
1138 start of the .got section. See also comment at
1139 R_CRIS_32_GOT. */
1140 relocation -= sgot->output_section->vma;
1141
1142 /* Resolve a PLT_GOTREL reloc against a local symbol directly,
1143 without using the procedure linkage table. */
1144 if (h == NULL)
1145 break;
1146
1147 if (h->plt.offset == (bfd_vma) -1
1148 || splt == NULL)
1149 {
1150 /* We didn't make a PLT entry for this symbol. This
1151 happens when statically linking PIC code, or when
1152 using -Bsymbolic. */
1153 break;
1154 }
1155
1156 relocation = (splt->output_section->vma
1157 + splt->output_offset
1158 + h->plt.offset
1159 - sgot->output_section->vma);
1160 break;
1161
1162 case R_CRIS_8_PCREL:
1163 case R_CRIS_16_PCREL:
1164 case R_CRIS_32_PCREL:
1165 /* If the symbol was local, we need no shlib-specific handling. */
1166 if (h == NULL)
1167 break;
1168
1169 /* Fall through. */
1170 case R_CRIS_8:
1171 case R_CRIS_16:
1172 case R_CRIS_32:
1173 if (info->shared
1174 && (input_section->flags & SEC_ALLOC) != 0
1175 && ((r_type != R_CRIS_8_PCREL
1176 && r_type != R_CRIS_16_PCREL
1177 && r_type != R_CRIS_32_PCREL)
1178 || (!info->symbolic
1179 || (h->elf_link_hash_flags
1180 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1181 {
1182 Elf_Internal_Rela outrel;
1183 boolean skip, relocate;
1184
1185 /* When generating a shared object, these relocations
1186 are copied into the output file to be resolved at run
1187 time. */
1188
1189 if (sreloc == NULL)
1190 {
1191 const char *name;
1192
1193 name = (bfd_elf_string_from_elf_section
1194 (input_bfd,
1195 elf_elfheader (input_bfd)->e_shstrndx,
1196 elf_section_data (input_section)->rel_hdr.sh_name));
1197 if (name == NULL)
1198 return false;
1199
1200 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1201 && strcmp (bfd_get_section_name (input_bfd,
1202 input_section),
1203 name + 5) == 0);
1204
1205 sreloc = bfd_get_section_by_name (dynobj, name);
1206
1207 /* That section should have been created in
1208 cris_elf_check_relocs, but that function will not be
1209 called for objects which fail in
1210 cris_elf_merge_private_bfd_data. */
1211 if (sreloc == NULL)
1212 {
1213 (*_bfd_error_handler)
1214 (_("%s: Internal inconsistency; no relocation section %s"),
1215 bfd_get_filename (input_bfd),
1216 name);
1217
1218 bfd_set_error (bfd_error_bad_value);
1219 return false;
1220 }
1221 }
1222
1223 skip = false;
1224
1225 if (elf_section_data (input_section)->stab_info == NULL)
1226 outrel.r_offset = rel->r_offset;
1227 else
1228 {
1229 bfd_vma off;
1230
1231 off = (_bfd_stab_section_offset
1232 (output_bfd, &elf_hash_table (info)->stab_info,
1233 input_section,
1234 &elf_section_data (input_section)->stab_info,
1235 rel->r_offset));
1236 if (off == (bfd_vma) -1)
1237 skip = true;
1238 outrel.r_offset = off;
1239 }
1240
1241 outrel.r_offset += (input_section->output_section->vma
1242 + input_section->output_offset);
1243
1244 if (skip)
1245 {
1246 memset (&outrel, 0, sizeof outrel);
1247 relocate = false;
1248 }
1249 /* h->dynindx may be -1 if the symbol was marked to
1250 become local. */
1251 else if (h != NULL
1252 && ((! info->symbolic && h->dynindx != -1)
1253 || (h->elf_link_hash_flags
1254 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1255 {
1256 BFD_ASSERT (h->dynindx != -1);
1257 relocate = false;
1258 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1259 outrel.r_addend = relocation + rel->r_addend;
1260 }
1261 else
1262 {
1263 if (r_type == R_CRIS_32)
1264 {
1265 relocate = true;
1266 outrel.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1267 outrel.r_addend = relocation + rel->r_addend;
1268 }
1269 else
1270 {
1271 long indx;
1272
1273 if (h == NULL)
1274 sec = local_sections[r_symndx];
1275 else
1276 {
1277 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1278 || (h->root.type
1279 == bfd_link_hash_defweak));
1280 sec = h->root.u.def.section;
1281 }
1282 if (sec != NULL && bfd_is_abs_section (sec))
1283 indx = 0;
1284 else if (sec == NULL || sec->owner == NULL)
1285 {
1286 bfd_set_error (bfd_error_bad_value);
1287 return false;
1288 }
1289 else
1290 {
1291 asection *osec;
1292
1293 osec = sec->output_section;
1294 indx = elf_section_data (osec)->dynindx;
1295 BFD_ASSERT (indx > 0);
1296 }
1297
1298 relocate = false;
1299 outrel.r_info = ELF32_R_INFO (indx, r_type);
1300 outrel.r_addend = relocation + rel->r_addend;
1301 }
1302 }
1303
1304 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1305 (((Elf32_External_Rela *)
1306 sreloc->contents)
1307 + sreloc->reloc_count));
1308 ++sreloc->reloc_count;
1309
1310 /* This reloc will be computed at runtime, so there's no
1311 need to do anything now, except for R_CRIS_32 relocations
1312 that have been turned into R_CRIS_RELATIVE. */
1313 if (!relocate)
1314 continue;
1315 }
1316
1317 break;
1318 }
1319
1320 r = cris_final_link_relocate (howto, input_bfd, input_section,
1321 contents, rel, relocation);
1322
1323 if (r != bfd_reloc_ok)
1324 {
1325 const char * msg = (const char *) NULL;
1326
1327 switch (r)
1328 {
1329 case bfd_reloc_overflow:
1330 r = info->callbacks->reloc_overflow
1331 (info, symname, howto->name, (bfd_vma) 0,
1332 input_bfd, input_section, rel->r_offset);
1333 break;
1334
1335 case bfd_reloc_undefined:
1336 r = info->callbacks->undefined_symbol
1337 (info, symname, input_bfd, input_section, rel->r_offset,
1338 true);
1339 break;
1340
1341 case bfd_reloc_outofrange:
1342 msg = _("internal error: out of range error");
1343 break;
1344
1345 case bfd_reloc_notsupported:
1346 msg = _("internal error: unsupported relocation error");
1347 break;
1348
1349 case bfd_reloc_dangerous:
1350 msg = _("internal error: dangerous relocation");
1351 break;
1352
1353 default:
1354 msg = _("internal error: unknown error");
1355 break;
1356 }
1357
1358 if (msg)
1359 r = info->callbacks->warning
1360 (info, msg, symname, input_bfd, input_section, rel->r_offset);
1361
1362 if (! r)
1363 return false;
1364 }
1365 }
1366
1367 return true;
1368 }
1369 \f
1370 /* Finish up dynamic symbol handling. We set the contents of various
1371 dynamic sections here. */
1372
1373 static boolean
1374 elf_cris_finish_dynamic_symbol (output_bfd, info, h, sym)
1375 bfd *output_bfd;
1376 struct bfd_link_info *info;
1377 struct elf_link_hash_entry *h;
1378 Elf_Internal_Sym *sym;
1379 {
1380 bfd *dynobj;
1381 int plt_off1 = 2, plt_off2 = 10, plt_off3 = 16;
1382
1383 dynobj = elf_hash_table (info)->dynobj;
1384
1385 if (h->plt.offset != (bfd_vma) -1)
1386 {
1387 asection *splt;
1388 asection *sgotplt;
1389 asection *sgot;
1390 asection *srela;
1391 bfd_vma got_base;
1392
1393 bfd_vma gotplt_offset
1394 = ((struct elf_cris_link_hash_entry *) h)->gotplt_offset;
1395 Elf_Internal_Rela rela;
1396 boolean has_gotplt = gotplt_offset != 0;
1397
1398 /* Get the index in the procedure linkage table which
1399 corresponds to this symbol. This is the index of this symbol
1400 in all the symbols for which we are making plt entries. The
1401 first entry in the procedure linkage table is reserved. */
1402 /* We have to count backwards here, and the result is only valid as
1403 an index into .got.plt and its relocations. FIXME: Constants... */
1404 bfd_vma gotplt_index = gotplt_offset/4 - 3;
1405
1406 /* Get the offset into the .got table of the entry that corresponds
1407 to this function. Note that we embed knowledge that "incoming"
1408 .got goes after .got.plt in the output without padding (pointer
1409 aligned). However, that knowledge is present in several other
1410 places too, here and in elflink.h at least. */
1411 bfd_vma got_offset
1412 = (has_gotplt
1413 ? gotplt_offset
1414 : h->got.offset + elf_cris_hash_table(info)->next_gotplt_entry);
1415
1416 /* This symbol has an entry in the procedure linkage table. Set it
1417 up. */
1418
1419 BFD_ASSERT (h->dynindx != -1);
1420
1421 splt = bfd_get_section_by_name (dynobj, ".plt");
1422 sgot = bfd_get_section_by_name (dynobj, ".got");
1423 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1424 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1425 BFD_ASSERT (splt != NULL && sgotplt != NULL
1426 && (! has_gotplt || srela != NULL));
1427
1428 got_base = sgotplt->output_section->vma + sgotplt->output_offset;
1429
1430 /* Fill in the entry in the procedure linkage table. */
1431 if (! info->shared)
1432 {
1433 memcpy (splt->contents + h->plt.offset, elf_cris_plt_entry,
1434 PLT_ENTRY_SIZE);
1435
1436 /* We need to enter the absolute address of the GOT entry here. */
1437 bfd_put_32 (output_bfd, got_base + got_offset,
1438 splt->contents + h->plt.offset + plt_off1);
1439 }
1440 else
1441 {
1442 memcpy (splt->contents + h->plt.offset, elf_cris_pic_plt_entry,
1443 PLT_ENTRY_SIZE);
1444 bfd_put_32 (output_bfd, got_offset,
1445 splt->contents + h->plt.offset + plt_off1);
1446 }
1447
1448 /* Fill in the plt entry and make a relocation, if this is a "real"
1449 PLT entry. */
1450 if (has_gotplt)
1451 {
1452 /* Fill in the offset into the reloc table. */
1453 bfd_put_32 (output_bfd,
1454 gotplt_index * sizeof (Elf32_External_Rela),
1455 splt->contents + h->plt.offset + plt_off2);
1456
1457 /* Fill in the offset to the first PLT entry, where to "jump". */
1458 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3 + 4),
1459 splt->contents + h->plt.offset + plt_off3);
1460
1461 /* Fill in the entry in the global offset table with the address of
1462 the relocating stub. */
1463 bfd_put_32 (output_bfd,
1464 (splt->output_section->vma
1465 + splt->output_offset
1466 + h->plt.offset
1467 + 8),
1468 sgotplt->contents + got_offset);
1469
1470 /* Fill in the entry in the .rela.plt section. */
1471 rela.r_offset = (sgotplt->output_section->vma
1472 + sgotplt->output_offset
1473 + got_offset);
1474 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_JUMP_SLOT);
1475 rela.r_addend = 0;
1476 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1477 ((Elf32_External_Rela *) srela->contents
1478 + gotplt_index));
1479 }
1480
1481 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1482 {
1483 /* Mark the symbol as undefined, rather than as defined in
1484 the .plt section. Leave the value alone. */
1485 sym->st_shndx = SHN_UNDEF;
1486
1487 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't
1488 know whether resetting the value is significant; if it really
1489 is, rather than a quirk or bug in the sparc port, then I
1490 believe we'd see this elsewhere. */
1491 /* If the symbol is weak, we do need to clear the value.
1492 Otherwise, the PLT entry would provide a definition for
1493 the symbol even if the symbol wasn't defined anywhere,
1494 and so the symbol would never be NULL. */
1495 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
1496 == 0)
1497 sym->st_value = 0;
1498 }
1499 }
1500
1501 /* We don't emit .got relocs for symbols that aren't in the
1502 dynamic-symbols table for an ordinary program. */
1503 if (h->got.offset != (bfd_vma) -1
1504 && (info->shared || h->dynindx != -1))
1505 {
1506 asection *sgot;
1507 asection *srela;
1508 Elf_Internal_Rela rela;
1509 bfd_byte *where;
1510
1511 /* This symbol has an entry in the global offset table. Set it up. */
1512
1513 sgot = bfd_get_section_by_name (dynobj, ".got");
1514 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1515 BFD_ASSERT (sgot != NULL && srela != NULL);
1516
1517 rela.r_offset = (sgot->output_section->vma
1518 + sgot->output_offset
1519 + (h->got.offset &~ (bfd_vma) 1));
1520
1521 /* If this is a static link, or it is a -Bsymbolic link and the
1522 symbol is defined locally or was forced to be local because
1523 of a version file, we just want to emit a RELATIVE reloc.
1524 The entry in the global offset table will already have been
1525 initialized in the relocate_section function. */
1526 where = sgot->contents + (h->got.offset &~ (bfd_vma) 1);
1527 if (! elf_hash_table (info)->dynamic_sections_created
1528 || (info->shared
1529 && (info->symbolic || h->dynindx == -1)
1530 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1531 {
1532 rela.r_info = ELF32_R_INFO (0, R_CRIS_RELATIVE);
1533 rela.r_addend = bfd_get_signed_32 (output_bfd, where);
1534 }
1535 else
1536 {
1537 bfd_put_32 (output_bfd, (bfd_vma) 0, where);
1538 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_GLOB_DAT);
1539 rela.r_addend = 0;
1540 }
1541
1542 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1543 ((Elf32_External_Rela *) srela->contents
1544 + srela->reloc_count));
1545 ++srela->reloc_count;
1546 }
1547
1548 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1549 {
1550 asection *s;
1551 Elf_Internal_Rela rela;
1552
1553 /* This symbol needs a copy reloc. Set it up. */
1554
1555 BFD_ASSERT (h->dynindx != -1
1556 && (h->root.type == bfd_link_hash_defined
1557 || h->root.type == bfd_link_hash_defweak));
1558
1559 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1560 ".rela.bss");
1561 BFD_ASSERT (s != NULL);
1562
1563 rela.r_offset = (h->root.u.def.value
1564 + h->root.u.def.section->output_section->vma
1565 + h->root.u.def.section->output_offset);
1566 rela.r_info = ELF32_R_INFO (h->dynindx, R_CRIS_COPY);
1567 rela.r_addend = 0;
1568 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1569 ((Elf32_External_Rela *) s->contents
1570 + s->reloc_count));
1571 ++s->reloc_count;
1572 }
1573
1574 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1575 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1576 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1577 sym->st_shndx = SHN_ABS;
1578
1579 return true;
1580 }
1581 \f
1582 /* Finish up the dynamic sections. */
1583
1584 static boolean
1585 elf_cris_finish_dynamic_sections (output_bfd, info)
1586 bfd *output_bfd;
1587 struct bfd_link_info *info;
1588 {
1589 bfd *dynobj;
1590 asection *sgot;
1591 asection *sdyn;
1592
1593 dynobj = elf_hash_table (info)->dynobj;
1594
1595 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1596 BFD_ASSERT (sgot != NULL);
1597 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1598
1599 if (elf_hash_table (info)->dynamic_sections_created)
1600 {
1601 asection *splt;
1602 Elf32_External_Dyn *dyncon, *dynconend;
1603
1604 splt = bfd_get_section_by_name (dynobj, ".plt");
1605 BFD_ASSERT (splt != NULL && sdyn != NULL);
1606
1607 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1608 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1609 for (; dyncon < dynconend; dyncon++)
1610 {
1611 Elf_Internal_Dyn dyn;
1612 asection *s;
1613
1614 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1615
1616 switch (dyn.d_tag)
1617 {
1618 default:
1619 break;
1620
1621 case DT_PLTGOT:
1622 s = bfd_get_section_by_name (output_bfd, ".got");
1623 BFD_ASSERT (s != NULL);
1624 dyn.d_un.d_ptr = s->vma;
1625 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1626 break;
1627
1628 case DT_JMPREL:
1629 /* Yes, we *can* have a .plt and no .plt.rela, for instance
1630 if all symbols are found in the .got (not .got.plt). */
1631 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1632 dyn.d_un.d_ptr = s != NULL ? s->vma : 0;
1633 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1634 break;
1635
1636 case DT_PLTRELSZ:
1637 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1638 if (s == NULL)
1639 dyn.d_un.d_val = 0;
1640 else if (s->_cooked_size != 0)
1641 dyn.d_un.d_val = s->_cooked_size;
1642 else
1643 dyn.d_un.d_val = s->_raw_size;
1644 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1645 break;
1646
1647 case DT_RELASZ:
1648 /* The procedure linkage table relocs (DT_JMPREL) should
1649 not be included in the overall relocs (DT_RELA).
1650 Therefore, we override the DT_RELASZ entry here to
1651 make it not include the JMPREL relocs. Since the
1652 linker script arranges for .rela.plt to follow all
1653 other relocation sections, we don't have to worry
1654 about changing the DT_RELA entry. */
1655 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1656 if (s != NULL)
1657 {
1658 if (s->_cooked_size != 0)
1659 dyn.d_un.d_val -= s->_cooked_size;
1660 else
1661 dyn.d_un.d_val -= s->_raw_size;
1662 }
1663 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1664 break;
1665 }
1666 }
1667
1668 /* Fill in the first entry in the procedure linkage table. */
1669 if (splt->_raw_size > 0)
1670 {
1671 if (info->shared)
1672 memcpy (splt->contents, elf_cris_pic_plt0_entry, PLT_ENTRY_SIZE);
1673 else
1674 {
1675 memcpy (splt->contents, elf_cris_plt0_entry, PLT_ENTRY_SIZE);
1676 bfd_put_32 (output_bfd,
1677 sgot->output_section->vma + sgot->output_offset + 4,
1678 splt->contents + 6);
1679 bfd_put_32 (output_bfd,
1680 sgot->output_section->vma + sgot->output_offset + 8,
1681 splt->contents + 14);
1682
1683 elf_section_data (splt->output_section)->this_hdr.sh_entsize
1684 = PLT_ENTRY_SIZE;
1685 }
1686 }
1687 }
1688
1689 /* Fill in the first three entries in the global offset table. */
1690 if (sgot->_raw_size > 0)
1691 {
1692 if (sdyn == NULL)
1693 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1694 else
1695 bfd_put_32 (output_bfd,
1696 sdyn->output_section->vma + sdyn->output_offset,
1697 sgot->contents);
1698 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
1699 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
1700 }
1701
1702 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1703
1704 return true;
1705 }
1706 \f
1707 /* Return the section that should be marked against GC for a given
1708 relocation. */
1709
1710 static asection *
1711 cris_elf_gc_mark_hook (abfd, info, rel, h, sym)
1712 bfd * abfd;
1713 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1714 Elf_Internal_Rela * rel;
1715 struct elf_link_hash_entry * h;
1716 Elf_Internal_Sym * sym;
1717 {
1718 if (h != NULL)
1719 {
1720 switch (ELF32_R_TYPE (rel->r_info))
1721 {
1722 case R_CRIS_GNU_VTINHERIT:
1723 case R_CRIS_GNU_VTENTRY:
1724 break;
1725
1726 default:
1727 switch (h->root.type)
1728 {
1729 case bfd_link_hash_defined:
1730 case bfd_link_hash_defweak:
1731 return h->root.u.def.section;
1732
1733 case bfd_link_hash_common:
1734 return h->root.u.c.p->section;
1735
1736 default:
1737 break;
1738 }
1739 }
1740 }
1741 else
1742 {
1743 if (!(elf_bad_symtab (abfd)
1744 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
1745 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
1746 && sym->st_shndx != SHN_COMMON))
1747 {
1748 return bfd_section_from_elf_index (abfd, sym->st_shndx);
1749 }
1750 }
1751
1752 return NULL;
1753 }
1754
1755 /* Update the got entry reference counts for the section being removed. */
1756
1757 static boolean
1758 cris_elf_gc_sweep_hook (abfd, info, sec, relocs)
1759 bfd * abfd ATTRIBUTE_UNUSED;
1760 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1761 asection * sec ATTRIBUTE_UNUSED;
1762 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
1763 {
1764 Elf_Internal_Shdr *symtab_hdr;
1765 struct elf_link_hash_entry **sym_hashes;
1766 bfd_signed_vma *local_got_refcounts;
1767 const Elf_Internal_Rela *rel, *relend;
1768 unsigned long r_symndx;
1769 struct elf_link_hash_entry *h;
1770 bfd *dynobj;
1771 asection *sgot;
1772 asection *srelgot;
1773
1774 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1775 sym_hashes = elf_sym_hashes (abfd);
1776 local_got_refcounts = elf_local_got_refcounts (abfd);
1777
1778 dynobj = elf_hash_table (info)->dynobj;
1779 if (dynobj == NULL)
1780 return true;
1781
1782 sgot = bfd_get_section_by_name (dynobj, ".got");
1783 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1784
1785 relend = relocs + sec->reloc_count;
1786 for (rel = relocs; rel < relend; rel++)
1787 {
1788 switch (ELF32_R_TYPE (rel->r_info))
1789 {
1790 case R_CRIS_16_GOT:
1791 case R_CRIS_32_GOT:
1792 r_symndx = ELF32_R_SYM (rel->r_info);
1793 if (r_symndx >= symtab_hdr->sh_info)
1794 {
1795 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1796 if (h->got.refcount > 0)
1797 {
1798 --h->got.refcount;
1799 if (h->got.refcount == 0)
1800 {
1801 /* We don't need the .got entry any more. */
1802 sgot->_raw_size -= 4;
1803 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
1804 }
1805 }
1806 break;
1807 }
1808
1809 local_got_reloc:
1810 if (local_got_refcounts != NULL)
1811 {
1812 if (local_got_refcounts[r_symndx] > 0)
1813 {
1814 --local_got_refcounts[r_symndx];
1815 if (local_got_refcounts[r_symndx] == 0)
1816 {
1817 /* We don't need the .got entry any more. */
1818 sgot->_raw_size -= 4;
1819 if (info->shared)
1820 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
1821 }
1822 }
1823 }
1824 break;
1825
1826 case R_CRIS_16_GOTPLT:
1827 case R_CRIS_32_GOTPLT:
1828 /* For local symbols, treat these like GOT relocs. */
1829 r_symndx = ELF32_R_SYM (rel->r_info);
1830 if (r_symndx < symtab_hdr->sh_info)
1831 goto local_got_reloc;
1832
1833 case R_CRIS_32_PLT_GOTREL:
1834 /* FIXME: We don't garbage-collect away the .got section. */
1835 if (local_got_refcounts != NULL)
1836 local_got_refcounts[-1]--;
1837 /* Fall through. */
1838
1839 case R_CRIS_8_PCREL:
1840 case R_CRIS_16_PCREL:
1841 case R_CRIS_32_PCREL:
1842 case R_CRIS_32_PLT_PCREL:
1843 r_symndx = ELF32_R_SYM (rel->r_info);
1844 if (r_symndx >= symtab_hdr->sh_info)
1845 {
1846 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1847 if (h->plt.refcount > 0)
1848 --h->plt.refcount;
1849 }
1850 break;
1851
1852 default:
1853 break;
1854 }
1855 }
1856
1857 return true;
1858 }
1859
1860 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1861 entry but we found we will not create any. Called when we find we will
1862 not have any PLT for this symbol, by for example
1863 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link,
1864 or elf_cris_size_dynamic_sections if no dynamic sections will be
1865 created (we're only linking static objects). */
1866
1867 static boolean
1868 elf_cris_adjust_gotplt_to_got (h, p)
1869 struct elf_cris_link_hash_entry *h;
1870 PTR p;
1871 {
1872 struct bfd_link_info *info = (struct bfd_link_info *) p;
1873 bfd *dynobj = elf_hash_table (info)->dynobj;
1874
1875 BFD_ASSERT (dynobj != NULL);
1876
1877 /* If nobody wanted a GOTPLT with this symbol, we're done. */
1878 if (h->gotplt_refcount <= 0)
1879 return true;
1880
1881 if (h->root.got.refcount > 0)
1882 {
1883 /* There's a GOT entry for this symbol. Just adjust the refcount.
1884 Probably not necessary at this stage, but keeping it accurate
1885 helps avoiding surprises later. */
1886 h->root.got.refcount += h->gotplt_refcount;
1887 h->gotplt_refcount = -1;
1888 }
1889 else
1890 {
1891 /* No GOT entry for this symbol. We need to create one. */
1892 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
1893 asection *srelgot
1894 = bfd_get_section_by_name (dynobj, ".rela.got");
1895
1896 /* Put an accurate refcount there. */
1897 h->root.got.refcount = h->gotplt_refcount;
1898
1899 h->gotplt_refcount = -1;
1900
1901 /* We always have a .got section when there are dynamic
1902 relocs. */
1903 BFD_ASSERT (sgot != NULL /* Surely have .got section. */);
1904
1905 /* We might have had a PLT but with no GOT entry and
1906 further no GOT reloc section at all needed before.
1907 Add it. */
1908 if (srelgot == NULL)
1909 {
1910 srelgot = bfd_make_section (dynobj, ".rela.got");
1911
1912 if (srelgot == NULL
1913 || !bfd_set_section_flags (dynobj, srelgot,
1914 (SEC_ALLOC
1915 | SEC_LOAD
1916 | SEC_HAS_CONTENTS
1917 | SEC_IN_MEMORY
1918 | SEC_LINKER_CREATED
1919 | SEC_READONLY))
1920 || !bfd_set_section_alignment (dynobj, srelgot, 2))
1921 return false;
1922 }
1923
1924 /* Allocate space in the .got section. */
1925 sgot->_raw_size += 4;
1926
1927 /* Allocate relocation space. */
1928 srelgot->_raw_size += sizeof (Elf32_External_Rela);
1929 }
1930
1931 return true;
1932 }
1933
1934 /* Try to fold PLT entries with GOT entries. There are two cases when we
1935 want to do this:
1936
1937 - When all PLT references are GOTPLT references, and there are GOT
1938 references. We don't have to generate a PLT at all.
1939
1940 - When there are both (ordinary) PLT references and GOT references.
1941 We want to make the PLT reference use the ordinary GOT entry rather
1942 than a run-time dynamically resolved GOTPLT entry (since the GOT
1943 entry will have to be resolved at startup anyway).
1944
1945 Though the latter case is handled when room for the PLT is allocated,
1946 not here.
1947
1948 Note that this function is called before symbols are forced local by
1949 version scripts. The differing cases are handled by
1950 elf_cris_hide_symbol. */
1951
1952 static boolean
1953 elf_cris_try_fold_plt_to_got (h, p)
1954 struct elf_cris_link_hash_entry *h;
1955 PTR p;
1956 {
1957 struct bfd_link_info *info = (struct bfd_link_info *) p;
1958
1959 /* If there are no GOT references for this symbol, we can't fold any
1960 other reference so there's nothing to do. Likewise if there are no
1961 PLT references; GOTPLT references included. */
1962 if (h->root.got.refcount <= 0 || h->root.plt.refcount <= 0)
1963 return true;
1964
1965 /* GOTPLT relocs are supposed to be included into the PLT refcount. */
1966 BFD_ASSERT (h->gotplt_refcount <= h->root.plt.refcount);
1967
1968 if (h->gotplt_refcount == h->root.plt.refcount)
1969 {
1970 /* The only PLT references are GOTPLT references, and there are GOT
1971 references. Convert PLT to GOT references. */
1972 if (! elf_cris_adjust_gotplt_to_got (h, info))
1973 return false;
1974
1975 /* Clear the PLT references, so no PLT will be created. */
1976 h->root.plt.offset = (bfd_vma) -1;
1977 }
1978
1979 return true;
1980 }
1981
1982 /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc
1983 to use a GOT entry (and create one) rather than requiring a GOTPLT
1984 entry. */
1985
1986 static void
1987 elf_cris_hide_symbol (info, h)
1988 struct bfd_link_info *info;
1989 struct elf_link_hash_entry *h;
1990 {
1991 elf_cris_adjust_gotplt_to_got ((struct elf_cris_link_hash_entry *) h, info);
1992
1993 _bfd_elf_link_hash_hide_symbol (info, h);
1994 }
1995
1996 /* Adjust a symbol defined by a dynamic object and referenced by a
1997 regular object. The current definition is in some section of the
1998 dynamic object, but we're not including those sections. We have to
1999 change the definition to something the rest of the link can
2000 understand. */
2001
2002 static boolean
2003 elf_cris_adjust_dynamic_symbol (info, h)
2004 struct bfd_link_info *info;
2005 struct elf_link_hash_entry *h;
2006 {
2007 bfd *dynobj;
2008 asection *s;
2009 unsigned int power_of_two;
2010
2011 dynobj = elf_hash_table (info)->dynobj;
2012
2013 /* Make sure we know what is going on here. */
2014 BFD_ASSERT (dynobj != NULL
2015 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
2016 || h->weakdef != NULL
2017 || ((h->elf_link_hash_flags
2018 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2019 && (h->elf_link_hash_flags
2020 & ELF_LINK_HASH_REF_REGULAR) != 0
2021 && (h->elf_link_hash_flags
2022 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
2023
2024 /* If this is a function, put it in the procedure linkage table. We
2025 will fill in the contents of the procedure linkage table later,
2026 when we know the address of the .got section. */
2027 if (h->type == STT_FUNC
2028 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
2029 {
2030 if (! info->shared
2031 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
2032 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
2033 /* We must always create the plt entry if it was referenced by a
2034 PLT relocation. In this case we already recorded it as a
2035 dynamic symbol. */
2036 /* FIXME: m68k and i386 differ here, for unclear reasons. */
2037 && h->dynindx == -1)
2038 {
2039 /* This case can occur if we saw a PLT reloc in an input file,
2040 but the symbol was never referred to by a dynamic object. In
2041 such a case, we don't actually need to build a procedure
2042 linkage table, and we can just do a PC reloc instead, or
2043 change a .got.plt index to a .got index for GOTPLT relocs. */
2044 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
2045 h->plt.offset = (bfd_vma) -1;
2046
2047 return
2048 elf_cris_adjust_gotplt_to_got ((struct
2049 elf_cris_link_hash_entry *) h,
2050 info);
2051 }
2052
2053 /* If there are only GOT references and GOTPLT references to this
2054 PLT entry, get rid of the PLT. */
2055 if (! elf_cris_try_fold_plt_to_got ((struct elf_cris_link_hash_entry *)
2056 h, info))
2057 return false;
2058
2059 /* GC or folding may have rendered this entry unused. */
2060 if (h->plt.refcount <= 0)
2061 {
2062 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
2063 h->plt.offset = (bfd_vma) -1;
2064 return true;
2065 }
2066
2067 /* Make sure this symbol is output as a dynamic symbol. */
2068 if (h->dynindx == -1)
2069 {
2070 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
2071 return false;
2072 }
2073
2074 s = bfd_get_section_by_name (dynobj, ".plt");
2075 BFD_ASSERT (s != NULL);
2076
2077 /* If this is the first .plt entry, make room for the special
2078 first entry. */
2079 if (s->_raw_size == 0)
2080 s->_raw_size += PLT_ENTRY_SIZE;
2081
2082 /* If this symbol is not defined in a regular file, and we are
2083 not generating a shared library, then set the symbol to this
2084 location in the .plt. This is required to make function
2085 pointers compare as equal between the normal executable and
2086 the shared library. */
2087 if (!info->shared
2088 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2089 {
2090 h->root.u.def.section = s;
2091 h->root.u.def.value = s->_raw_size;
2092 }
2093
2094 /* If there's already a GOT entry, use that, not a .got.plt. A
2095 GOT field still has a reference count when we get here; it's
2096 not yet changed to an offset. */
2097 if (h->got.refcount > 0)
2098 {
2099 h->got.refcount += h->plt.refcount;
2100
2101 /* Mark the PLT offset to use the GOT entry by setting the low
2102 bit in the plt offset; it is always a multiple of
2103 pointer-size. */
2104 BFD_ASSERT ((s->_raw_size & 3) == 0);
2105
2106 /* Change the PLT refcount to an offset. */
2107 h->plt.offset = s->_raw_size;
2108
2109 /* By not setting gotplt_offset (i.e. it remains at 0), we signal
2110 that the got entry should be used instead. */
2111 BFD_ASSERT (((struct elf_cris_link_hash_entry *)
2112 h)->gotplt_offset == 0);
2113
2114 /* Make room for this entry. */
2115 s->_raw_size += PLT_ENTRY_SIZE;
2116
2117 return true;
2118 }
2119
2120 /* No GOT reference for this symbol; prepare for an ordinary PLT. */
2121 h->plt.offset = s->_raw_size;
2122
2123 /* Make room for this entry. */
2124 s->_raw_size += PLT_ENTRY_SIZE;
2125
2126 /* We also need to make an entry in the .got.plt section, which
2127 will be placed in the .got section by the linker script. */
2128 ((struct elf_cris_link_hash_entry *) h)->gotplt_offset
2129 = elf_cris_hash_table (info)->next_gotplt_entry;
2130 elf_cris_hash_table (info)->next_gotplt_entry += 4;
2131
2132 s = bfd_get_section_by_name (dynobj, ".got.plt");
2133 BFD_ASSERT (s != NULL);
2134 s->_raw_size += 4;
2135
2136 /* We also need to make an entry in the .rela.plt section. */
2137
2138 s = bfd_get_section_by_name (dynobj, ".rela.plt");
2139 BFD_ASSERT (s != NULL);
2140 s->_raw_size += sizeof (Elf32_External_Rela);
2141
2142 return true;
2143 }
2144
2145 /* Reinitialize the plt offset now that it is not used as a reference
2146 count any more. */
2147 h->plt.offset = (bfd_vma) -1;
2148
2149 /* If this is a weak symbol, and there is a real definition, the
2150 processor independent code will have arranged for us to see the
2151 real definition first, and we can just use the same value. */
2152 if (h->weakdef != NULL)
2153 {
2154 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
2155 || h->weakdef->root.type == bfd_link_hash_defweak);
2156 h->root.u.def.section = h->weakdef->root.u.def.section;
2157 h->root.u.def.value = h->weakdef->root.u.def.value;
2158 return true;
2159 }
2160
2161 /* This is a reference to a symbol defined by a dynamic object which
2162 is not a function. */
2163
2164 /* If we are creating a shared library, we must presume that the
2165 only references to the symbol are via the global offset table.
2166 For such cases we need not do anything here; the relocations will
2167 be handled correctly by relocate_section. */
2168 if (info->shared)
2169 return true;
2170
2171 /* If there are no references to this symbol that do not use the
2172 GOT, we don't need to generate a copy reloc. */
2173 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
2174 return true;
2175
2176 /* We must allocate the symbol in our .dynbss section, which will
2177 become part of the .bss section of the executable. There will be
2178 an entry for this symbol in the .dynsym section. The dynamic
2179 object will contain position independent code, so all references
2180 from the dynamic object to this symbol will go through the global
2181 offset table. The dynamic linker will use the .dynsym entry to
2182 determine the address it must put in the global offset table, so
2183 both the dynamic object and the regular object will refer to the
2184 same memory location for the variable. */
2185
2186 s = bfd_get_section_by_name (dynobj, ".dynbss");
2187 BFD_ASSERT (s != NULL);
2188
2189 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to
2190 copy the initial value out of the dynamic object and into the
2191 runtime process image. We need to remember the offset into the
2192 .rela.bss section we are going to use. */
2193 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2194 {
2195 asection *srel;
2196
2197 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
2198 BFD_ASSERT (srel != NULL);
2199 srel->_raw_size += sizeof (Elf32_External_Rela);
2200 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
2201 }
2202
2203 /* Historic precedent: m68k and i386 allow max 8-byte alignment for the
2204 thing to copy; so do we. */
2205
2206 /* We need to figure out the alignment required for this symbol. I
2207 have no idea how ELF linkers handle this. */
2208 power_of_two = bfd_log2 (h->size);
2209 if (power_of_two > 3)
2210 power_of_two = 3;
2211
2212 /* Apply the required alignment. */
2213 s->_raw_size = BFD_ALIGN (s->_raw_size,
2214 (bfd_size_type) (1 << power_of_two));
2215 if (power_of_two > bfd_get_section_alignment (dynobj, s))
2216 {
2217 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
2218 return false;
2219 }
2220
2221 /* Define the symbol as being at this point in the section. */
2222 h->root.u.def.section = s;
2223 h->root.u.def.value = s->_raw_size;
2224
2225 /* Increment the section size to make room for the symbol. */
2226 s->_raw_size += h->size;
2227
2228 return true;
2229 }
2230
2231 /* Look through the relocs for a section during the first phase. */
2232
2233 static boolean
2234 cris_elf_check_relocs (abfd, info, sec, relocs)
2235 bfd *abfd;
2236 struct bfd_link_info *info;
2237 asection *sec;
2238 const Elf_Internal_Rela *relocs;
2239 {
2240 bfd *dynobj;
2241 Elf_Internal_Shdr *symtab_hdr;
2242 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
2243 bfd_signed_vma *local_got_refcounts;
2244 const Elf_Internal_Rela *rel;
2245 const Elf_Internal_Rela *rel_end;
2246 asection *sgot;
2247 asection *srelgot;
2248 asection *sreloc;
2249
2250 if (info->relocateable)
2251 return true;
2252
2253 dynobj = elf_hash_table (info)->dynobj;
2254 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2255 sym_hashes = elf_sym_hashes (abfd);
2256 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
2257 local_got_refcounts = elf_local_got_refcounts (abfd);
2258
2259 sgot = NULL;
2260 srelgot = NULL;
2261 sreloc = NULL;
2262
2263 if (!elf_bad_symtab (abfd))
2264 sym_hashes_end -= symtab_hdr->sh_info;
2265
2266 rel_end = relocs + sec->reloc_count;
2267 for (rel = relocs; rel < rel_end; rel++)
2268 {
2269 struct elf_link_hash_entry *h;
2270 unsigned long r_symndx;
2271 enum elf_cris_reloc_type r_type;
2272
2273 r_symndx = ELF32_R_SYM (rel->r_info);
2274 if (r_symndx < symtab_hdr->sh_info)
2275 h = NULL;
2276 else
2277 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2278
2279 r_type = ELF32_R_TYPE (rel->r_info);
2280
2281 /* Some relocs require linker-created sections; we need to hang them
2282 on the first input bfd we found that contained dynamic relocs. */
2283 switch (r_type)
2284 {
2285 case R_CRIS_16_GOT:
2286 case R_CRIS_32_GOT:
2287 case R_CRIS_32_GOTREL:
2288 case R_CRIS_32_PLT_GOTREL:
2289 case R_CRIS_32_PLT_PCREL:
2290 case R_CRIS_16_GOTPLT:
2291 case R_CRIS_32_GOTPLT:
2292 if (dynobj == NULL)
2293 {
2294 elf_hash_table (info)->dynobj = dynobj = abfd;
2295
2296 /* Create the .got section, so we can assume it's always
2297 present whenever there's a dynobj. */
2298 if (!_bfd_elf_create_got_section (dynobj, info))
2299 return false;
2300 }
2301 break;
2302
2303 default:
2304 break;
2305 }
2306
2307 /* Some relocs require a global offset table (but perhaps not a
2308 specific GOT entry). */
2309 switch (r_type)
2310 {
2311 case R_CRIS_16_GOT:
2312 case R_CRIS_32_GOT:
2313 case R_CRIS_32_GOTREL:
2314 case R_CRIS_32_PLT_GOTREL:
2315 if (sgot == NULL)
2316 sgot = bfd_get_section_by_name (dynobj, ".got");
2317
2318 if (local_got_refcounts == NULL)
2319 {
2320 bfd_size_type amt;
2321
2322 /* We use index local_got_refcounts[-1] to count all
2323 GOT-relative relocations that do not have explicit
2324 GOT entries. */
2325 amt = symtab_hdr->sh_info + 1;
2326 amt *= sizeof (bfd_signed_vma);
2327 local_got_refcounts = ((bfd_signed_vma *) bfd_alloc (abfd, amt));
2328 if (local_got_refcounts == NULL)
2329 return false;
2330 memset (local_got_refcounts, -1, (size_t) amt);
2331
2332 local_got_refcounts++;
2333 elf_local_got_refcounts (abfd) = local_got_refcounts;
2334 }
2335 break;
2336
2337 default:
2338 break;
2339 }
2340
2341 switch (r_type)
2342 {
2343 case R_CRIS_16_GOTPLT:
2344 case R_CRIS_32_GOTPLT:
2345 /* Mark that we need a GOT entry if the PLT entry (and its GOT
2346 entry) is eliminated. We can only do this for a non-local
2347 symbol. */
2348 if (h != NULL)
2349 {
2350 ((struct elf_cris_link_hash_entry *) h)->gotplt_refcount++;
2351 goto handle_gotplt_reloc;
2352 }
2353 /* If h is NULL then this is a local symbol, and we must make a
2354 GOT entry for it, so handle it like a GOT reloc. */
2355 /* Fall through. */
2356
2357 case R_CRIS_16_GOT:
2358 case R_CRIS_32_GOT:
2359 /* This symbol requires a global offset table entry. */
2360
2361 if (srelgot == NULL
2362 && (h != NULL || info->shared))
2363 {
2364 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2365 if (srelgot == NULL)
2366 {
2367 srelgot = bfd_make_section (dynobj, ".rela.got");
2368 if (srelgot == NULL
2369 || !bfd_set_section_flags (dynobj, srelgot,
2370 (SEC_ALLOC
2371 | SEC_LOAD
2372 | SEC_HAS_CONTENTS
2373 | SEC_IN_MEMORY
2374 | SEC_LINKER_CREATED
2375 | SEC_READONLY))
2376 || !bfd_set_section_alignment (dynobj, srelgot, 2))
2377 return false;
2378 }
2379 }
2380
2381 if (h != NULL)
2382 {
2383 if (h->got.refcount == -1)
2384 {
2385 h->got.refcount = 1;
2386
2387 /* Make sure this symbol is output as a dynamic symbol. */
2388 if (h->dynindx == -1)
2389 {
2390 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
2391 return false;
2392 }
2393
2394 /* Allocate space in the .got section. */
2395 sgot->_raw_size += 4;
2396 /* Allocate relocation space. */
2397 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2398 }
2399 else
2400 h->got.refcount++;
2401 }
2402 else
2403 {
2404 /* This is a global offset table entry for a local symbol. */
2405 if (local_got_refcounts[r_symndx] == -1)
2406 {
2407 local_got_refcounts[r_symndx] = 1;
2408
2409 sgot->_raw_size += 4;
2410 if (info->shared)
2411 {
2412 /* If we are generating a shared object, we need to
2413 output a R_CRIS_RELATIVE reloc so that the dynamic
2414 linker can adjust this GOT entry. */
2415 srelgot->_raw_size += sizeof (Elf32_External_Rela);
2416 }
2417 }
2418 else
2419 local_got_refcounts[r_symndx]++;
2420 }
2421 break;
2422
2423 case R_CRIS_32_GOTREL:
2424 /* This reference requires a global offset table.
2425 FIXME: The actual refcount isn't used currently; the .got
2426 section can't be removed if there were any references in the
2427 input. */
2428 local_got_refcounts[-1]++;
2429 break;
2430
2431 handle_gotplt_reloc:
2432
2433 case R_CRIS_32_PLT_GOTREL:
2434 /* This reference requires a global offset table. */
2435 local_got_refcounts[-1]++;
2436 /* Fall through. */
2437
2438 case R_CRIS_32_PLT_PCREL:
2439 /* This symbol requires a procedure linkage table entry. We
2440 actually build the entry in adjust_dynamic_symbol,
2441 because this might be a case of linking PIC code which is
2442 never referenced by a dynamic object, in which case we
2443 don't need to generate a procedure linkage table entry
2444 after all. */
2445
2446 /* If this is a local symbol, we resolve it directly without
2447 creating a procedure linkage table entry. */
2448 if (h == NULL)
2449 continue;
2450
2451 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
2452 if (h->plt.refcount == -1)
2453 h->plt.refcount = 1;
2454 else
2455 h->plt.refcount++;
2456 break;
2457
2458 case R_CRIS_8:
2459 case R_CRIS_16:
2460 case R_CRIS_32:
2461 /* Let's help debug shared library creation. Any of these
2462 relocs can be used in shared libs, but pages containing them
2463 cannot be shared. Don't warn for sections we don't care
2464 about, such as debug sections or non-constant sections. We
2465 can't help tables of (global) function pointers, for example,
2466 though they must be emitted in a data section to avoid having
2467 impure text sections. */
2468 if (info->shared
2469 && (sec->flags & SEC_ALLOC) != 0
2470 && (sec->flags & SEC_READONLY) != 0)
2471 {
2472 /* FIXME: How do we make this optionally a warning only? */
2473 if (abfd->my_archive)
2474 (*_bfd_error_handler)
2475 (_("%s(%s), section %s:\n relocation %s should not be used in a shared object; recompile with -fPIC"),
2476 bfd_get_filename (bfd_my_archive (abfd)),
2477 bfd_get_filename (abfd),
2478 sec->name,
2479 cris_elf_howto_table[r_type].name);
2480 else
2481 (*_bfd_error_handler)
2482 (_("%s, section %s:\n relocation %s should not be used in a shared object; recompile with -fPIC"),
2483 bfd_get_filename (abfd),
2484 sec->name,
2485 cris_elf_howto_table[r_type].name);
2486 }
2487 /* Fall through. */
2488
2489 case R_CRIS_8_PCREL:
2490 case R_CRIS_16_PCREL:
2491 case R_CRIS_32_PCREL:
2492 if (h != NULL)
2493 {
2494 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
2495
2496 /* Make sure a plt entry is created for this symbol if it
2497 turns out to be a function defined by a dynamic object. */
2498 if (h->plt.refcount == -1)
2499 h->plt.refcount = 1;
2500 else
2501 h->plt.refcount++;
2502 }
2503
2504 /* If we are creating a shared library and this is not a local
2505 symbol, we need to copy the reloc into the shared library.
2506 However when linking with -Bsymbolic and this is a global
2507 symbol which is defined in an object we are including in the
2508 link (i.e., DEF_REGULAR is set), then we can resolve the
2509 reloc directly. At this point we have not seen all the input
2510 files, so it is possible that DEF_REGULAR is not set now but
2511 will be set later (it is never cleared). In case of a weak
2512 definition, DEF_REGULAR may be cleared later by a strong
2513 definition in a shared library. We account for that
2514 possibility below by storing information in the relocs_copied
2515 field of the hash table entry. A similar situation occurs
2516 when creating shared libraries and symbol visibility changes
2517 render the symbol local. */
2518
2519 /* No need to do anything if we're not creating a shared object. */
2520 if (! info->shared)
2521 break;
2522
2523 /* We don't need to handle relocs into sections not going into
2524 the "real" output. */
2525 if ((sec->flags & SEC_ALLOC) == 0)
2526 break;
2527
2528 /* We can only eliminate PC-relative relocs. */
2529 if (r_type == R_CRIS_8_PCREL
2530 || r_type == R_CRIS_16_PCREL
2531 || r_type == R_CRIS_32_PCREL)
2532 {
2533 /* If the symbol is local, then we can eliminate the reloc. */
2534 if (h == NULL)
2535 break;
2536
2537 /* If this is with -Bsymbolic and the symbol isn't weak, and
2538 is defined by an ordinary object (the ones we include in
2539 this shared library) then we can also eliminate the
2540 reloc. See comment above for more eliminable cases which
2541 we can't identify at this time. */
2542 if (info->symbolic
2543 && h->root.type != bfd_link_hash_defweak
2544 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
2545 break;
2546 }
2547
2548 /* We create a reloc section in dynobj and make room for this
2549 reloc. */
2550 if (sreloc == NULL)
2551 {
2552 const char *name;
2553
2554 name = (bfd_elf_string_from_elf_section
2555 (abfd,
2556 elf_elfheader (abfd)->e_shstrndx,
2557 elf_section_data (sec)->rel_hdr.sh_name));
2558 if (name == NULL)
2559 return false;
2560
2561 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
2562 && strcmp (bfd_get_section_name (abfd, sec),
2563 name + 5) == 0);
2564
2565 sreloc = bfd_get_section_by_name (dynobj, name);
2566 if (sreloc == NULL)
2567 {
2568 sreloc = bfd_make_section (dynobj, name);
2569 if (sreloc == NULL
2570 || !bfd_set_section_flags (dynobj, sreloc,
2571 (SEC_ALLOC
2572 | SEC_LOAD
2573 | SEC_HAS_CONTENTS
2574 | SEC_IN_MEMORY
2575 | SEC_LINKER_CREATED
2576 | SEC_READONLY))
2577 || !bfd_set_section_alignment (dynobj, sreloc, 2))
2578 return false;
2579 }
2580 if (sec->flags & SEC_READONLY)
2581 info->flags |= DF_TEXTREL;
2582 }
2583
2584 sreloc->_raw_size += sizeof (Elf32_External_Rela);
2585
2586 /* If we are linking with -Bsymbolic, we count the number of PC
2587 relative relocations we have entered for this symbol, so that
2588 we can discard them again if the symbol is later defined by a
2589 regular object. We know that h is really a pointer to an
2590 elf_cris_link_hash_entry. */
2591 if ((r_type == R_CRIS_8_PCREL
2592 || r_type == R_CRIS_16_PCREL
2593 || r_type == R_CRIS_32_PCREL)
2594 && info->symbolic)
2595 {
2596 struct elf_cris_link_hash_entry *eh;
2597 struct elf_cris_pcrel_relocs_copied *p;
2598
2599 eh = (struct elf_cris_link_hash_entry *) h;
2600
2601 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
2602 if (p->section == sreloc)
2603 break;
2604
2605 if (p == NULL)
2606 {
2607 p = ((struct elf_cris_pcrel_relocs_copied *)
2608 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
2609 if (p == NULL)
2610 return false;
2611 p->next = eh->pcrel_relocs_copied;
2612 eh->pcrel_relocs_copied = p;
2613 p->section = sreloc;
2614 p->count = 0;
2615 }
2616
2617 ++p->count;
2618 }
2619 break;
2620
2621 /* This relocation describes the C++ object vtable hierarchy.
2622 Reconstruct it for later use during GC. */
2623 case R_CRIS_GNU_VTINHERIT:
2624 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2625 return false;
2626 break;
2627
2628 /* This relocation describes which C++ vtable entries are actually
2629 used. Record for later use during GC. */
2630 case R_CRIS_GNU_VTENTRY:
2631 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2632 return false;
2633 break;
2634
2635 default:
2636 /* Other relocs do not appear here. */
2637 bfd_set_error (bfd_error_bad_value);
2638 return false;
2639 }
2640 }
2641
2642 return true;
2643 }
2644
2645 /* Set the sizes of the dynamic sections. */
2646
2647 static boolean
2648 elf_cris_size_dynamic_sections (output_bfd, info)
2649 bfd *output_bfd ATTRIBUTE_UNUSED;
2650 struct bfd_link_info *info;
2651 {
2652 bfd *dynobj;
2653 asection *s;
2654 boolean plt;
2655 boolean relocs;
2656
2657 dynobj = elf_hash_table (info)->dynobj;
2658 BFD_ASSERT (dynobj != NULL);
2659
2660 if (elf_hash_table (info)->dynamic_sections_created)
2661 {
2662 /* Set the contents of the .interp section to the interpreter. */
2663 if (!info->shared)
2664 {
2665 s = bfd_get_section_by_name (dynobj, ".interp");
2666 BFD_ASSERT (s != NULL);
2667 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
2668 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2669 }
2670 }
2671 else
2672 {
2673 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */
2674 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2675 elf_cris_adjust_gotplt_to_got,
2676 (PTR) info);
2677
2678 /* We may have created entries in the .rela.got section.
2679 However, if we are not creating the dynamic sections, we will
2680 not actually use these entries. Reset the size of .rela.got,
2681 which will cause it to get stripped from the output file
2682 below. */
2683 s = bfd_get_section_by_name (dynobj, ".rela.got");
2684 if (s != NULL)
2685 s->_raw_size = 0;
2686 }
2687
2688 /* If this is a -Bsymbolic shared link, then we need to discard all PC
2689 relative relocs against symbols defined in a regular object. We
2690 allocated space for them in the check_relocs routine, but we will not
2691 fill them in in the relocate_section routine. We also discard space
2692 for relocs that have become for local symbols due to symbol
2693 visibility changes. For programs, we discard space for relocs for
2694 symbols not referenced by any dynamic object. */
2695 if (info->shared)
2696 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2697 elf_cris_discard_excess_dso_dynamics,
2698 (PTR) info);
2699 else
2700 elf_cris_link_hash_traverse (elf_cris_hash_table (info),
2701 elf_cris_discard_excess_program_dynamics,
2702 (PTR) info);
2703
2704 /* The check_relocs and adjust_dynamic_symbol entry points have
2705 determined the sizes of the various dynamic sections. Allocate
2706 memory for them. */
2707 plt = false;
2708 relocs = false;
2709 for (s = dynobj->sections; s != NULL; s = s->next)
2710 {
2711 const char *name;
2712 boolean strip;
2713
2714 if ((s->flags & SEC_LINKER_CREATED) == 0)
2715 continue;
2716
2717 /* It's OK to base decisions on the section name, because none
2718 of the dynobj section names depend upon the input files. */
2719 name = bfd_get_section_name (dynobj, s);
2720
2721 strip = false;
2722
2723 if (strcmp (name, ".plt") == 0)
2724 {
2725 if (s->_raw_size == 0)
2726 {
2727 /* Strip this section if we don't need it; see the
2728 comment below. */
2729 strip = true;
2730 }
2731 else
2732 {
2733 /* Remember whether there is a PLT. */
2734 plt = true;
2735 }
2736 }
2737 else if (strncmp (name, ".rela", 5) == 0)
2738 {
2739 if (s->_raw_size == 0)
2740 {
2741 /* If we don't need this section, strip it from the
2742 output file. This is mostly to handle .rela.bss and
2743 .rela.plt. We must create both sections in
2744 create_dynamic_sections, because they must be created
2745 before the linker maps input sections to output
2746 sections. The linker does that before
2747 adjust_dynamic_symbol is called, and it is that
2748 function which decides whether anything needs to go
2749 into these sections. */
2750 strip = true;
2751 }
2752 else
2753 {
2754 /* Remember whether there are any reloc sections other
2755 than .rela.plt. */
2756 if (strcmp (name, ".rela.plt") != 0)
2757 relocs = true;
2758
2759 /* We use the reloc_count field as a counter if we need
2760 to copy relocs into the output file. */
2761 s->reloc_count = 0;
2762 }
2763 }
2764 else if (strncmp (name, ".got", 4) != 0)
2765 {
2766 /* It's not one of our sections, so don't allocate space. */
2767 continue;
2768 }
2769
2770 if (strip)
2771 {
2772 _bfd_strip_section_from_output (info, s);
2773 continue;
2774 }
2775
2776 /* Allocate memory for the section contents. We use bfd_zalloc here
2777 in case unused entries are not reclaimed before the section's
2778 contents are written out. This should not happen, but this way
2779 if it does, we will not write out garbage. For reloc sections,
2780 this will make entries have the type R_CRIS_NONE. */
2781 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
2782 if (s->contents == NULL && s->_raw_size != 0)
2783 return false;
2784 }
2785
2786 if (elf_hash_table (info)->dynamic_sections_created)
2787 {
2788 /* Add some entries to the .dynamic section. We fill in the
2789 values later, in elf_cris_finish_dynamic_sections, but we
2790 must add the entries now so that we get the correct size for
2791 the .dynamic section. The DT_DEBUG entry is filled in by the
2792 dynamic linker and used by the debugger. */
2793 #define add_dynamic_entry(TAG, VAL) \
2794 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
2795
2796 if (!info->shared)
2797 {
2798 if (!add_dynamic_entry (DT_DEBUG, 0))
2799 return false;
2800 }
2801
2802 if (plt)
2803 {
2804 if (!add_dynamic_entry (DT_PLTGOT, 0)
2805 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2806 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2807 || !add_dynamic_entry (DT_JMPREL, 0))
2808 return false;
2809 }
2810
2811 if (relocs)
2812 {
2813 if (!add_dynamic_entry (DT_RELA, 0)
2814 || !add_dynamic_entry (DT_RELASZ, 0)
2815 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2816 return false;
2817 }
2818
2819 if ((info->flags & DF_TEXTREL) != 0)
2820 {
2821 if (!add_dynamic_entry (DT_TEXTREL, 0))
2822 return false;
2823 info->flags |= DF_TEXTREL;
2824 }
2825 }
2826 #undef add_dynamic_entry
2827
2828 return true;
2829 }
2830
2831 /* This function is called via elf_cris_link_hash_traverse if we are
2832 creating a shared object. In the -Bsymbolic case, it discards the
2833 space allocated to copy PC relative relocs against symbols which
2834 are defined in regular objects. For the normal non-symbolic case,
2835 we also discard space for relocs that have become local due to
2836 symbol visibility changes. We allocated space for them in the
2837 check_relocs routine, but we won't fill them in in the
2838 relocate_section routine. */
2839
2840 static boolean
2841 elf_cris_discard_excess_dso_dynamics (h, inf)
2842 struct elf_cris_link_hash_entry *h;
2843 PTR inf;
2844 {
2845 struct elf_cris_pcrel_relocs_copied *s;
2846 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2847
2848 /* If a symbol has been forced local or we have found a regular
2849 definition for the symbolic link case, then we won't be needing
2850 any relocs. */
2851 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
2852 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
2853 || info->symbolic))
2854 {
2855 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
2856 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
2857 }
2858
2859 return true;
2860 }
2861
2862 /* This function is called via elf_cris_link_hash_traverse if we are *not*
2863 creating a shared object. We discard space for relocs for symbols put
2864 in the .got, but which we found we do not have to resolve at run-time. */
2865
2866 static boolean
2867 elf_cris_discard_excess_program_dynamics (h, inf)
2868 struct elf_cris_link_hash_entry *h;
2869 PTR inf;
2870 {
2871 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2872
2873 /* If we're not creating a shared library and have a symbol which is
2874 referred to by .got references, but the symbol is defined locally,
2875 (or rather, not referred to by a DSO and not defined by a DSO) then
2876 lose the reloc for the .got (don't allocate room for it). */
2877 if ((h->root.elf_link_hash_flags
2878 & (ELF_LINK_HASH_REF_DYNAMIC | ELF_LINK_HASH_DEF_DYNAMIC)) == 0)
2879 {
2880 if (h->root.got.refcount > 0
2881 /* The size of this section is only valid and in sync with the
2882 various reference counts if we do dynamic; don't decrement it
2883 otherwise. */
2884 && elf_hash_table (info)->dynamic_sections_created)
2885 {
2886 bfd *dynobj = elf_hash_table (info)->dynobj;
2887 asection *srelgot;
2888
2889 BFD_ASSERT (dynobj != NULL);
2890
2891 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
2892
2893 BFD_ASSERT (srelgot != NULL);
2894
2895 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
2896 }
2897
2898 /* If the locally-defined symbol isn't used by a DSO, then we don't
2899 have to export it as a dynamic symbol. This was already done for
2900 functions; doing this for all symbols would presumably not
2901 introduce new problems. */
2902 h->root.dynindx = -1;
2903 }
2904
2905 return true;
2906 }
2907
2908 /* Reject a file depending on presence and expectation of prefixed
2909 underscores on symbols. */
2910
2911 static boolean
2912 cris_elf_object_p (abfd)
2913 bfd *abfd;
2914 {
2915 if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE))
2916 return (bfd_get_symbol_leading_char (abfd) == '_');
2917 else
2918 return (bfd_get_symbol_leading_char (abfd) == 0);
2919 }
2920
2921 /* Mark presence or absence of leading underscore. */
2922
2923 static void
2924 cris_elf_final_write_processing (abfd, linker)
2925 bfd *abfd;
2926 boolean linker ATTRIBUTE_UNUSED;
2927 {
2928 if (bfd_get_symbol_leading_char (abfd) == '_')
2929 elf_elfheader (abfd)->e_flags |= EF_CRIS_UNDERSCORE;
2930 else
2931 elf_elfheader (abfd)->e_flags &= ~EF_CRIS_UNDERSCORE;
2932 }
2933
2934 /* Display the flags field. */
2935
2936 static boolean
2937 cris_elf_print_private_bfd_data (abfd, ptr)
2938 bfd *abfd;
2939 PTR ptr;
2940 {
2941 FILE *file = (FILE *) ptr;
2942
2943 BFD_ASSERT (abfd != NULL && ptr != NULL)
2944
2945 _bfd_elf_print_private_bfd_data (abfd, ptr);
2946
2947 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
2948
2949 if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)
2950 fprintf (file, _(" [symbols have a _ prefix]"));
2951
2952 fputc ('\n', file);
2953 return true;
2954 }
2955
2956 /* Don't mix files with and without a leading underscore. */
2957
2958 static boolean
2959 cris_elf_merge_private_bfd_data (ibfd, obfd)
2960 bfd *ibfd;
2961 bfd *obfd;
2962 {
2963 flagword old_flags, new_flags;
2964
2965 if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
2966 return false;
2967
2968 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
2969 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
2970 return true;
2971
2972 if (! elf_flags_init (obfd))
2973 {
2974 /* This happens when ld starts out with a 'blank' output file. */
2975 elf_flags_init (obfd) = true;
2976
2977 /* Set flags according to current bfd_target. */
2978 cris_elf_final_write_processing (obfd, false);
2979 }
2980
2981 old_flags = elf_elfheader (obfd)->e_flags;
2982 new_flags = elf_elfheader (ibfd)->e_flags;
2983
2984 /* Is this good or bad? We'll follow with other excluding flags. */
2985 if ((old_flags & EF_CRIS_UNDERSCORE) != (new_flags & EF_CRIS_UNDERSCORE))
2986 {
2987 (*_bfd_error_handler)
2988 ((new_flags & EF_CRIS_UNDERSCORE)
2989 ? _("%s: uses _-prefixed symbols, but writing file with non-prefixed symbols")
2990 : _("%s: uses non-prefixed symbols, but writing file with _-prefixed symbols"),
2991 bfd_get_filename (ibfd));
2992 bfd_set_error (bfd_error_bad_value);
2993 return false;
2994 }
2995
2996 return true;
2997 }
2998
2999
3000 static enum elf_reloc_type_class
3001 elf_cris_reloc_type_class (type)
3002 int type;
3003 {
3004 switch (type)
3005 {
3006 case R_CRIS_RELATIVE:
3007 return reloc_class_relative;
3008 case R_CRIS_JUMP_SLOT:
3009 return reloc_class_plt;
3010 case R_CRIS_COPY:
3011 return reloc_class_copy;
3012 default:
3013 return reloc_class_normal;
3014 }
3015 }
3016 \f
3017 #define ELF_ARCH bfd_arch_cris
3018 #define ELF_MACHINE_CODE EM_CRIS
3019 #define ELF_MAXPAGESIZE 0x2000
3020
3021 #define TARGET_LITTLE_SYM bfd_elf32_cris_vec
3022 #define TARGET_LITTLE_NAME "elf32-cris"
3023 #define elf_symbol_leading_char 0
3024
3025 #define elf_info_to_howto_rel NULL
3026 #define elf_info_to_howto cris_info_to_howto_rela
3027 #define elf_backend_relocate_section cris_elf_relocate_section
3028 #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook
3029 #define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook
3030 #define elf_backend_check_relocs cris_elf_check_relocs
3031
3032 #define elf_backend_can_gc_sections 1
3033
3034 #define elf_backend_object_p cris_elf_object_p
3035 #define elf_backend_final_write_processing \
3036 cris_elf_final_write_processing
3037 #define bfd_elf32_bfd_print_private_bfd_data \
3038 cris_elf_print_private_bfd_data
3039 #define bfd_elf32_bfd_merge_private_bfd_data \
3040 cris_elf_merge_private_bfd_data
3041
3042 #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup
3043
3044 #define bfd_elf32_bfd_link_hash_table_create \
3045 elf_cris_link_hash_table_create
3046 #define elf_backend_adjust_dynamic_symbol \
3047 elf_cris_adjust_dynamic_symbol
3048 #define elf_backend_size_dynamic_sections \
3049 elf_cris_size_dynamic_sections
3050 #define elf_backend_finish_dynamic_symbol \
3051 elf_cris_finish_dynamic_symbol
3052 #define elf_backend_finish_dynamic_sections \
3053 elf_cris_finish_dynamic_sections
3054 #define elf_backend_create_dynamic_sections \
3055 _bfd_elf_create_dynamic_sections
3056 #define bfd_elf32_bfd_final_link \
3057 _bfd_elf32_gc_common_final_link
3058 #define elf_backend_hide_symbol elf_cris_hide_symbol
3059 #define elf_backend_reloc_type_class elf_cris_reloc_type_class
3060
3061 #define elf_backend_want_got_plt 1
3062 #define elf_backend_plt_readonly 1
3063 #define elf_backend_want_plt_sym 0
3064 #define elf_backend_got_header_size 12
3065 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
3066
3067 /* Later, we my want to optimize RELA entries into REL entries for dynamic
3068 linking and libraries (if it's a win of any significance). Until then,
3069 take the easy route. */
3070 #define elf_backend_may_use_rel_p 0
3071 #define elf_backend_may_use_rela_p 1
3072
3073 #include "elf32-target.h"
3074
3075 #define INCLUDED_TARGET_FILE
3076
3077 #undef TARGET_LITTLE_SYM
3078 #undef TARGET_LITTLE_NAME
3079 #undef elf_symbol_leading_char
3080
3081 #define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec
3082 #define TARGET_LITTLE_NAME "elf32-us-cris"
3083 #define elf_symbol_leading_char '_'
3084
3085 #include "elf32-target.h"
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