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Better handking for unresolved symbols
[binutils.git] / bfd / elf32-m68k.c
blob7688bfd9fc260a84393081b3f6d7a833d1a097ae
1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/m68k.h"
27
28 static reloc_howto_type *reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30 static void rtype_to_howto
31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
32 static struct bfd_hash_entry *elf_m68k_link_hash_newfunc
33 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
34 static struct bfd_link_hash_table *elf_m68k_link_hash_table_create
35 PARAMS ((bfd *));
36 static bfd_boolean elf_m68k_check_relocs
37 PARAMS ((bfd *, struct bfd_link_info *, asection *,
38 const Elf_Internal_Rela *));
39 static asection *elf_m68k_gc_mark_hook
40 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
41 struct elf_link_hash_entry *, Elf_Internal_Sym *));
42 static bfd_boolean elf_m68k_gc_sweep_hook
43 PARAMS ((bfd *, struct bfd_link_info *, asection *,
44 const Elf_Internal_Rela *));
45 static bfd_boolean elf_m68k_adjust_dynamic_symbol
46 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
47 static bfd_boolean elf_m68k_size_dynamic_sections
48 PARAMS ((bfd *, struct bfd_link_info *));
49 static bfd_boolean elf_m68k_discard_copies
50 PARAMS ((struct elf_link_hash_entry *, PTR));
51 static bfd_boolean elf_m68k_relocate_section
52 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
53 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
54 static bfd_boolean elf_m68k_finish_dynamic_symbol
55 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
56 Elf_Internal_Sym *));
57 static bfd_boolean elf_m68k_finish_dynamic_sections
58 PARAMS ((bfd *, struct bfd_link_info *));
59
60 static bfd_boolean elf32_m68k_set_private_flags
61 PARAMS ((bfd *, flagword));
62 static bfd_boolean elf32_m68k_merge_private_bfd_data
63 PARAMS ((bfd *, bfd *));
64 static bfd_boolean elf32_m68k_print_private_bfd_data
65 PARAMS ((bfd *, PTR));
66 static enum elf_reloc_type_class elf32_m68k_reloc_type_class
67 PARAMS ((const Elf_Internal_Rela *));
68
69 static reloc_howto_type howto_table[] = {
70 HOWTO(R_68K_NONE, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", FALSE, 0, 0x00000000,FALSE),
71 HOWTO(R_68K_32, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", FALSE, 0, 0xffffffff,FALSE),
72 HOWTO(R_68K_16, 0, 1,16, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", FALSE, 0, 0x0000ffff,FALSE),
73 HOWTO(R_68K_8, 0, 0, 8, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", FALSE, 0, 0x000000ff,FALSE),
74 HOWTO(R_68K_PC32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", FALSE, 0, 0xffffffff,TRUE),
75 HOWTO(R_68K_PC16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", FALSE, 0, 0x0000ffff,TRUE),
76 HOWTO(R_68K_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", FALSE, 0, 0x000000ff,TRUE),
77 HOWTO(R_68K_GOT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", FALSE, 0, 0xffffffff,TRUE),
78 HOWTO(R_68K_GOT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", FALSE, 0, 0x0000ffff,TRUE),
79 HOWTO(R_68K_GOT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", FALSE, 0, 0x000000ff,TRUE),
80 HOWTO(R_68K_GOT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", FALSE, 0, 0xffffffff,FALSE),
81 HOWTO(R_68K_GOT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", FALSE, 0, 0x0000ffff,FALSE),
82 HOWTO(R_68K_GOT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", FALSE, 0, 0x000000ff,FALSE),
83 HOWTO(R_68K_PLT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", FALSE, 0, 0xffffffff,TRUE),
84 HOWTO(R_68K_PLT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", FALSE, 0, 0x0000ffff,TRUE),
85 HOWTO(R_68K_PLT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", FALSE, 0, 0x000000ff,TRUE),
86 HOWTO(R_68K_PLT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", FALSE, 0, 0xffffffff,FALSE),
87 HOWTO(R_68K_PLT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", FALSE, 0, 0x0000ffff,FALSE),
88 HOWTO(R_68K_PLT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", FALSE, 0, 0x000000ff,FALSE),
89 HOWTO(R_68K_COPY, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", FALSE, 0, 0xffffffff,FALSE),
90 HOWTO(R_68K_GLOB_DAT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", FALSE, 0, 0xffffffff,FALSE),
91 HOWTO(R_68K_JMP_SLOT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", FALSE, 0, 0xffffffff,FALSE),
92 HOWTO(R_68K_RELATIVE, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", FALSE, 0, 0xffffffff,FALSE),
93 /* GNU extension to record C++ vtable hierarchy. */
94 HOWTO (R_68K_GNU_VTINHERIT, /* type */
95 0, /* rightshift */
96 2, /* size (0 = byte, 1 = short, 2 = long) */
97 0, /* bitsize */
98 FALSE, /* pc_relative */
99 0, /* bitpos */
100 complain_overflow_dont, /* complain_on_overflow */
101 NULL, /* special_function */
102 "R_68K_GNU_VTINHERIT", /* name */
103 FALSE, /* partial_inplace */
104 0, /* src_mask */
105 0, /* dst_mask */
106 FALSE),
107 /* GNU extension to record C++ vtable member usage. */
108 HOWTO (R_68K_GNU_VTENTRY, /* type */
109 0, /* rightshift */
110 2, /* size (0 = byte, 1 = short, 2 = long) */
111 0, /* bitsize */
112 FALSE, /* pc_relative */
113 0, /* bitpos */
114 complain_overflow_dont, /* complain_on_overflow */
115 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
116 "R_68K_GNU_VTENTRY", /* name */
117 FALSE, /* partial_inplace */
118 0, /* src_mask */
119 0, /* dst_mask */
120 FALSE),
121 };
122
123 static void
124 rtype_to_howto (abfd, cache_ptr, dst)
125 bfd *abfd ATTRIBUTE_UNUSED;
126 arelent *cache_ptr;
127 Elf_Internal_Rela *dst;
128 {
129 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max);
130 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
131 }
132
133 #define elf_info_to_howto rtype_to_howto
134
135 static const struct
136 {
137 bfd_reloc_code_real_type bfd_val;
138 int elf_val;
139 } reloc_map[] = {
140 { BFD_RELOC_NONE, R_68K_NONE },
141 { BFD_RELOC_32, R_68K_32 },
142 { BFD_RELOC_16, R_68K_16 },
143 { BFD_RELOC_8, R_68K_8 },
144 { BFD_RELOC_32_PCREL, R_68K_PC32 },
145 { BFD_RELOC_16_PCREL, R_68K_PC16 },
146 { BFD_RELOC_8_PCREL, R_68K_PC8 },
147 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 },
148 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 },
149 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 },
150 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O },
151 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O },
152 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O },
153 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 },
154 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 },
155 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 },
156 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O },
157 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O },
158 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O },
159 { BFD_RELOC_NONE, R_68K_COPY },
160 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT },
161 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT },
162 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE },
163 { BFD_RELOC_CTOR, R_68K_32 },
164 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT },
165 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY },
166 };
167
168 static reloc_howto_type *
169 reloc_type_lookup (abfd, code)
170 bfd *abfd ATTRIBUTE_UNUSED;
171 bfd_reloc_code_real_type code;
172 {
173 unsigned int i;
174 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
175 {
176 if (reloc_map[i].bfd_val == code)
177 return &howto_table[reloc_map[i].elf_val];
178 }
179 return 0;
180 }
181
182 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
183 #define ELF_ARCH bfd_arch_m68k
184 \f
185 /* Functions for the m68k ELF linker. */
186
187 /* The name of the dynamic interpreter. This is put in the .interp
188 section. */
189
190 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
191
192 /* The size in bytes of an entry in the procedure linkage table. */
193
194 #define PLT_ENTRY_SIZE 20
195
196 /* The first entry in a procedure linkage table looks like this. See
197 the SVR4 ABI m68k supplement to see how this works. */
198
199 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
200 {
201 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
202 0, 0, 0, 0, /* replaced with offset to .got + 4. */
203 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
204 0, 0, 0, 0, /* replaced with offset to .got + 8. */
205 0, 0, 0, 0 /* pad out to 20 bytes. */
206 };
207
208 /* Subsequent entries in a procedure linkage table look like this. */
209
210 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
211 {
212 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
213 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
214 0x2f, 0x3c, /* move.l #offset,-(%sp) */
215 0, 0, 0, 0, /* replaced with offset into relocation table. */
216 0x60, 0xff, /* bra.l .plt */
217 0, 0, 0, 0 /* replaced with offset to start of .plt. */
218 };
219
220 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
221
222 #define PLT_CPU32_ENTRY_SIZE 24
223 /* Procedure linkage table entries for the cpu32 */
224 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
225 {
226 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
227 0, 0, 0, 0, /* replaced with offset to .got + 4. */
228 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
229 0, 0, 0, 0, /* replace with offset to .got +8. */
230 0x4e, 0xd1, /* jmp %a1@ */
231 0, 0, 0, 0, /* pad out to 24 bytes. */
232 0, 0
233 };
234
235 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
236 {
237 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
238 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
239 0x4e, 0xd1, /* jmp %a1@ */
240 0x2f, 0x3c, /* move.l #offset,-(%sp) */
241 0, 0, 0, 0, /* replaced with offset into relocation table. */
242 0x60, 0xff, /* bra.l .plt */
243 0, 0, 0, 0, /* replaced with offset to start of .plt. */
244 0, 0
245 };
246
247 /* The m68k linker needs to keep track of the number of relocs that it
248 decides to copy in check_relocs for each symbol. This is so that it
249 can discard PC relative relocs if it doesn't need them when linking
250 with -Bsymbolic. We store the information in a field extending the
251 regular ELF linker hash table. */
252
253 /* This structure keeps track of the number of PC relative relocs we have
254 copied for a given symbol. */
255
256 struct elf_m68k_pcrel_relocs_copied
257 {
258 /* Next section. */
259 struct elf_m68k_pcrel_relocs_copied *next;
260 /* A section in dynobj. */
261 asection *section;
262 /* Number of relocs copied in this section. */
263 bfd_size_type count;
264 };
265
266 /* m68k ELF linker hash entry. */
267
268 struct elf_m68k_link_hash_entry
269 {
270 struct elf_link_hash_entry root;
271
272 /* Number of PC relative relocs copied for this symbol. */
273 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
274 };
275
276 #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent))
277
278 /* m68k ELF linker hash table. */
279
280 struct elf_m68k_link_hash_table
281 {
282 struct elf_link_hash_table root;
283
284 /* Small local sym to section mapping cache. */
285 struct sym_sec_cache sym_sec;
286 };
287
288 /* Get the m68k ELF linker hash table from a link_info structure. */
289
290 #define elf_m68k_hash_table(p) \
291 ((struct elf_m68k_link_hash_table *) (p)->hash)
292
293 /* Create an entry in an m68k ELF linker hash table. */
294
295 static struct bfd_hash_entry *
296 elf_m68k_link_hash_newfunc (entry, table, string)
297 struct bfd_hash_entry *entry;
298 struct bfd_hash_table *table;
299 const char *string;
300 {
301 struct bfd_hash_entry *ret = entry;
302
303 /* Allocate the structure if it has not already been allocated by a
304 subclass. */
305 if (ret == NULL)
306 ret = bfd_hash_allocate (table,
307 sizeof (struct elf_m68k_link_hash_entry));
308 if (ret == NULL)
309 return ret;
310
311 /* Call the allocation method of the superclass. */
312 ret = _bfd_elf_link_hash_newfunc (ret, table, string);
313 if (ret != NULL)
314 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL;
315
316 return ret;
317 }
318
319 /* Create an m68k ELF linker hash table. */
320
321 static struct bfd_link_hash_table *
322 elf_m68k_link_hash_table_create (abfd)
323 bfd *abfd;
324 {
325 struct elf_m68k_link_hash_table *ret;
326 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table);
327
328 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt);
329 if (ret == (struct elf_m68k_link_hash_table *) NULL)
330 return NULL;
331
332 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
333 elf_m68k_link_hash_newfunc))
334 {
335 free (ret);
336 return NULL;
337 }
338
339 ret->sym_sec.abfd = NULL;
340
341 return &ret->root.root;
342 }
343
344 /* Keep m68k-specific flags in the ELF header. */
345 static bfd_boolean
346 elf32_m68k_set_private_flags (abfd, flags)
347 bfd *abfd;
348 flagword flags;
349 {
350 elf_elfheader (abfd)->e_flags = flags;
351 elf_flags_init (abfd) = TRUE;
352 return TRUE;
353 }
354
355 /* Merge backend specific data from an object file to the output
356 object file when linking. */
357 static bfd_boolean
358 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
359 bfd *ibfd;
360 bfd *obfd;
361 {
362 flagword out_flags;
363 flagword in_flags;
364
365 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
366 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
367 return TRUE;
368
369 in_flags = elf_elfheader (ibfd)->e_flags;
370 out_flags = elf_elfheader (obfd)->e_flags;
371
372 if (!elf_flags_init (obfd))
373 {
374 elf_flags_init (obfd) = TRUE;
375 elf_elfheader (obfd)->e_flags = in_flags;
376 }
377
378 return TRUE;
379 }
380
381 /* Display the flags field. */
382 static bfd_boolean
383 elf32_m68k_print_private_bfd_data (abfd, ptr)
384 bfd *abfd;
385 PTR ptr;
386 {
387 FILE *file = (FILE *) ptr;
388
389 BFD_ASSERT (abfd != NULL && ptr != NULL);
390
391 /* Print normal ELF private data. */
392 _bfd_elf_print_private_bfd_data (abfd, ptr);
393
394 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
395
396 /* xgettext:c-format */
397 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
398
399 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
400 fprintf (file, _(" [cpu32]"));
401
402 if (elf_elfheader (abfd)->e_flags & EF_M68000)
403 fprintf (file, _(" [m68000]"));
404
405 fputc ('\n', file);
406
407 return TRUE;
408 }
409 /* Look through the relocs for a section during the first phase, and
410 allocate space in the global offset table or procedure linkage
411 table. */
412
413 static bfd_boolean
414 elf_m68k_check_relocs (abfd, info, sec, relocs)
415 bfd *abfd;
416 struct bfd_link_info *info;
417 asection *sec;
418 const Elf_Internal_Rela *relocs;
419 {
420 bfd *dynobj;
421 Elf_Internal_Shdr *symtab_hdr;
422 struct elf_link_hash_entry **sym_hashes;
423 bfd_signed_vma *local_got_refcounts;
424 const Elf_Internal_Rela *rel;
425 const Elf_Internal_Rela *rel_end;
426 asection *sgot;
427 asection *srelgot;
428 asection *sreloc;
429
430 if (info->relocatable)
431 return TRUE;
432
433 dynobj = elf_hash_table (info)->dynobj;
434 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
435 sym_hashes = elf_sym_hashes (abfd);
436 local_got_refcounts = elf_local_got_refcounts (abfd);
437
438 sgot = NULL;
439 srelgot = NULL;
440 sreloc = NULL;
441
442 rel_end = relocs + sec->reloc_count;
443 for (rel = relocs; rel < rel_end; rel++)
444 {
445 unsigned long r_symndx;
446 struct elf_link_hash_entry *h;
447
448 r_symndx = ELF32_R_SYM (rel->r_info);
449
450 if (r_symndx < symtab_hdr->sh_info)
451 h = NULL;
452 else
453 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
454
455 switch (ELF32_R_TYPE (rel->r_info))
456 {
457 case R_68K_GOT8:
458 case R_68K_GOT16:
459 case R_68K_GOT32:
460 if (h != NULL
461 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
462 break;
463 /* Fall through. */
464 case R_68K_GOT8O:
465 case R_68K_GOT16O:
466 case R_68K_GOT32O:
467 /* This symbol requires a global offset table entry. */
468
469 if (dynobj == NULL)
470 {
471 /* Create the .got section. */
472 elf_hash_table (info)->dynobj = dynobj = abfd;
473 if (!_bfd_elf_create_got_section (dynobj, info))
474 return FALSE;
475 }
476
477 if (sgot == NULL)
478 {
479 sgot = bfd_get_section_by_name (dynobj, ".got");
480 BFD_ASSERT (sgot != NULL);
481 }
482
483 if (srelgot == NULL
484 && (h != NULL || info->shared))
485 {
486 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
487 if (srelgot == NULL)
488 {
489 srelgot = bfd_make_section (dynobj, ".rela.got");
490 if (srelgot == NULL
491 || !bfd_set_section_flags (dynobj, srelgot,
492 (SEC_ALLOC
493 | SEC_LOAD
494 | SEC_HAS_CONTENTS
495 | SEC_IN_MEMORY
496 | SEC_LINKER_CREATED
497 | SEC_READONLY))
498 || !bfd_set_section_alignment (dynobj, srelgot, 2))
499 return FALSE;
500 }
501 }
502
503 if (h != NULL)
504 {
505 if (h->got.refcount == 0)
506 {
507 /* Make sure this symbol is output as a dynamic symbol. */
508 if (h->dynindx == -1
509 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
510 {
511 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
512 return FALSE;
513 }
514
515 /* Allocate space in the .got section. */
516 sgot->_raw_size += 4;
517 /* Allocate relocation space. */
518 srelgot->_raw_size += sizeof (Elf32_External_Rela);
519 }
520 h->got.refcount++;
521 }
522 else
523 {
524 /* This is a global offset table entry for a local symbol. */
525 if (local_got_refcounts == NULL)
526 {
527 bfd_size_type size;
528
529 size = symtab_hdr->sh_info;
530 size *= sizeof (bfd_signed_vma);
531 local_got_refcounts = ((bfd_signed_vma *)
532 bfd_zalloc (abfd, size));
533 if (local_got_refcounts == NULL)
534 return FALSE;
535 elf_local_got_refcounts (abfd) = local_got_refcounts;
536 }
537 if (local_got_refcounts[r_symndx] == 0)
538 {
539 sgot->_raw_size += 4;
540 if (info->shared)
541 {
542 /* If we are generating a shared object, we need to
543 output a R_68K_RELATIVE reloc so that the dynamic
544 linker can adjust this GOT entry. */
545 srelgot->_raw_size += sizeof (Elf32_External_Rela);
546 }
547 }
548 local_got_refcounts[r_symndx]++;
549 }
550 break;
551
552 case R_68K_PLT8:
553 case R_68K_PLT16:
554 case R_68K_PLT32:
555 /* This symbol requires a procedure linkage table entry. We
556 actually build the entry in adjust_dynamic_symbol,
557 because this might be a case of linking PIC code which is
558 never referenced by a dynamic object, in which case we
559 don't need to generate a procedure linkage table entry
560 after all. */
561
562 /* If this is a local symbol, we resolve it directly without
563 creating a procedure linkage table entry. */
564 if (h == NULL)
565 continue;
566
567 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
568 h->plt.refcount++;
569 break;
570
571 case R_68K_PLT8O:
572 case R_68K_PLT16O:
573 case R_68K_PLT32O:
574 /* This symbol requires a procedure linkage table entry. */
575
576 if (h == NULL)
577 {
578 /* It does not make sense to have this relocation for a
579 local symbol. FIXME: does it? How to handle it if
580 it does make sense? */
581 bfd_set_error (bfd_error_bad_value);
582 return FALSE;
583 }
584
585 /* Make sure this symbol is output as a dynamic symbol. */
586 if (h->dynindx == -1
587 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
588 {
589 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
590 return FALSE;
591 }
592
593 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
594 h->plt.refcount++;
595 break;
596
597 case R_68K_PC8:
598 case R_68K_PC16:
599 case R_68K_PC32:
600 /* If we are creating a shared library and this is not a local
601 symbol, we need to copy the reloc into the shared library.
602 However when linking with -Bsymbolic and this is a global
603 symbol which is defined in an object we are including in the
604 link (i.e., DEF_REGULAR is set), then we can resolve the
605 reloc directly. At this point we have not seen all the input
606 files, so it is possible that DEF_REGULAR is not set now but
607 will be set later (it is never cleared). We account for that
608 possibility below by storing information in the
609 pcrel_relocs_copied field of the hash table entry. */
610 if (!(info->shared
611 && (sec->flags & SEC_ALLOC) != 0
612 && h != NULL
613 && (!info->symbolic
614 || h->root.type == bfd_link_hash_defweak
615 || (h->elf_link_hash_flags
616 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
617 {
618 if (h != NULL)
619 {
620 /* Make sure a plt entry is created for this symbol if
621 it turns out to be a function defined by a dynamic
622 object. */
623 h->plt.refcount++;
624 }
625 break;
626 }
627 /* Fall through. */
628 case R_68K_8:
629 case R_68K_16:
630 case R_68K_32:
631 if (h != NULL)
632 {
633 /* Make sure a plt entry is created for this symbol if it
634 turns out to be a function defined by a dynamic object. */
635 h->plt.refcount++;
636 }
637
638 /* If we are creating a shared library, we need to copy the
639 reloc into the shared library. */
640 if (info->shared
641 && (sec->flags & SEC_ALLOC) != 0)
642 {
643 /* When creating a shared object, we must copy these
644 reloc types into the output file. We create a reloc
645 section in dynobj and make room for this reloc. */
646 if (sreloc == NULL)
647 {
648 const char *name;
649
650 name = (bfd_elf_string_from_elf_section
651 (abfd,
652 elf_elfheader (abfd)->e_shstrndx,
653 elf_section_data (sec)->rel_hdr.sh_name));
654 if (name == NULL)
655 return FALSE;
656
657 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
658 && strcmp (bfd_get_section_name (abfd, sec),
659 name + 5) == 0);
660
661 sreloc = bfd_get_section_by_name (dynobj, name);
662 if (sreloc == NULL)
663 {
664 sreloc = bfd_make_section (dynobj, name);
665 if (sreloc == NULL
666 || !bfd_set_section_flags (dynobj, sreloc,
667 (SEC_ALLOC
668 | SEC_LOAD
669 | SEC_HAS_CONTENTS
670 | SEC_IN_MEMORY
671 | SEC_LINKER_CREATED
672 | SEC_READONLY))
673 || !bfd_set_section_alignment (dynobj, sreloc, 2))
674 return FALSE;
675 }
676 elf_section_data (sec)->sreloc = sreloc;
677 }
678
679 if (sec->flags & SEC_READONLY
680 /* Don't set DF_TEXTREL yet for PC relative
681 relocations, they might be discarded later. */
682 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8
683 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
684 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32))
685 info->flags |= DF_TEXTREL;
686
687 sreloc->_raw_size += sizeof (Elf32_External_Rela);
688
689 /* We count the number of PC relative relocations we have
690 entered for this symbol, so that we can discard them
691 again if, in the -Bsymbolic case, the symbol is later
692 defined by a regular object, or, in the normal shared
693 case, the symbol is forced to be local. Note that this
694 function is only called if we are using an m68kelf linker
695 hash table, which means that h is really a pointer to an
696 elf_m68k_link_hash_entry. */
697 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8
698 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
699 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
700 {
701 struct elf_m68k_pcrel_relocs_copied *p;
702 struct elf_m68k_pcrel_relocs_copied **head;
703
704 if (h != NULL)
705 {
706 struct elf_m68k_link_hash_entry *eh
707 = elf_m68k_hash_entry (h);
708 head = &eh->pcrel_relocs_copied;
709 }
710 else
711 {
712 asection *s;
713 s = (bfd_section_from_r_symndx
714 (abfd, &elf_m68k_hash_table (info)->sym_sec,
715 sec, r_symndx));
716 if (s == NULL)
717 return FALSE;
718
719 head = ((struct elf_m68k_pcrel_relocs_copied **)
720 &elf_section_data (s)->local_dynrel);
721 }
722
723 for (p = *head; p != NULL; p = p->next)
724 if (p->section == sreloc)
725 break;
726
727 if (p == NULL)
728 {
729 p = ((struct elf_m68k_pcrel_relocs_copied *)
730 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
731 if (p == NULL)
732 return FALSE;
733 p->next = *head;
734 *head = p;
735 p->section = sreloc;
736 p->count = 0;
737 }
738
739 ++p->count;
740 }
741 }
742
743 break;
744
745 /* This relocation describes the C++ object vtable hierarchy.
746 Reconstruct it for later use during GC. */
747 case R_68K_GNU_VTINHERIT:
748 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
749 return FALSE;
750 break;
751
752 /* This relocation describes which C++ vtable entries are actually
753 used. Record for later use during GC. */
754 case R_68K_GNU_VTENTRY:
755 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
756 return FALSE;
757 break;
758
759 default:
760 break;
761 }
762 }
763
764 return TRUE;
765 }
766
767 /* Return the section that should be marked against GC for a given
768 relocation. */
769
770 static asection *
771 elf_m68k_gc_mark_hook (sec, info, rel, h, sym)
772 asection *sec;
773 struct bfd_link_info *info ATTRIBUTE_UNUSED;
774 Elf_Internal_Rela *rel;
775 struct elf_link_hash_entry *h;
776 Elf_Internal_Sym *sym;
777 {
778 if (h != NULL)
779 {
780 switch (ELF32_R_TYPE (rel->r_info))
781 {
782 case R_68K_GNU_VTINHERIT:
783 case R_68K_GNU_VTENTRY:
784 break;
785
786 default:
787 switch (h->root.type)
788 {
789 default:
790 break;
791
792 case bfd_link_hash_defined:
793 case bfd_link_hash_defweak:
794 return h->root.u.def.section;
795
796 case bfd_link_hash_common:
797 return h->root.u.c.p->section;
798 }
799 }
800 }
801 else
802 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
803
804 return NULL;
805 }
806
807 /* Update the got entry reference counts for the section being removed. */
808
809 static bfd_boolean
810 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
811 bfd *abfd;
812 struct bfd_link_info *info;
813 asection *sec;
814 const Elf_Internal_Rela *relocs;
815 {
816 Elf_Internal_Shdr *symtab_hdr;
817 struct elf_link_hash_entry **sym_hashes;
818 bfd_signed_vma *local_got_refcounts;
819 const Elf_Internal_Rela *rel, *relend;
820 unsigned long r_symndx;
821 struct elf_link_hash_entry *h;
822 bfd *dynobj;
823 asection *sgot;
824 asection *srelgot;
825
826 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
827 sym_hashes = elf_sym_hashes (abfd);
828 local_got_refcounts = elf_local_got_refcounts (abfd);
829
830 dynobj = elf_hash_table (info)->dynobj;
831 if (dynobj == NULL)
832 return TRUE;
833
834 sgot = bfd_get_section_by_name (dynobj, ".got");
835 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
836
837 relend = relocs + sec->reloc_count;
838 for (rel = relocs; rel < relend; rel++)
839 {
840 switch (ELF32_R_TYPE (rel->r_info))
841 {
842 case R_68K_GOT8:
843 case R_68K_GOT16:
844 case R_68K_GOT32:
845 case R_68K_GOT8O:
846 case R_68K_GOT16O:
847 case R_68K_GOT32O:
848 r_symndx = ELF32_R_SYM (rel->r_info);
849 if (r_symndx >= symtab_hdr->sh_info)
850 {
851 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
852 if (h->got.refcount > 0)
853 {
854 --h->got.refcount;
855 if (h->got.refcount == 0)
856 {
857 /* We don't need the .got entry any more. */
858 sgot->_raw_size -= 4;
859 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
860 }
861 }
862 }
863 else if (local_got_refcounts != NULL)
864 {
865 if (local_got_refcounts[r_symndx] > 0)
866 {
867 --local_got_refcounts[r_symndx];
868 if (local_got_refcounts[r_symndx] == 0)
869 {
870 /* We don't need the .got entry any more. */
871 sgot->_raw_size -= 4;
872 if (info->shared)
873 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
874 }
875 }
876 }
877 break;
878
879 case R_68K_PLT8:
880 case R_68K_PLT16:
881 case R_68K_PLT32:
882 case R_68K_PLT8O:
883 case R_68K_PLT16O:
884 case R_68K_PLT32O:
885 case R_68K_PC8:
886 case R_68K_PC16:
887 case R_68K_PC32:
888 case R_68K_8:
889 case R_68K_16:
890 case R_68K_32:
891 r_symndx = ELF32_R_SYM (rel->r_info);
892 if (r_symndx >= symtab_hdr->sh_info)
893 {
894 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
895 if (h->plt.refcount > 0)
896 --h->plt.refcount;
897 }
898 break;
899
900 default:
901 break;
902 }
903 }
904
905 return TRUE;
906 }
907
908 /* Adjust a symbol defined by a dynamic object and referenced by a
909 regular object. The current definition is in some section of the
910 dynamic object, but we're not including those sections. We have to
911 change the definition to something the rest of the link can
912 understand. */
913
914 static bfd_boolean
915 elf_m68k_adjust_dynamic_symbol (info, h)
916 struct bfd_link_info *info;
917 struct elf_link_hash_entry *h;
918 {
919 bfd *dynobj;
920 asection *s;
921 unsigned int power_of_two;
922
923 dynobj = elf_hash_table (info)->dynobj;
924
925 /* Make sure we know what is going on here. */
926 BFD_ASSERT (dynobj != NULL
927 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
928 || h->weakdef != NULL
929 || ((h->elf_link_hash_flags
930 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
931 && (h->elf_link_hash_flags
932 & ELF_LINK_HASH_REF_REGULAR) != 0
933 && (h->elf_link_hash_flags
934 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
935
936 /* If this is a function, put it in the procedure linkage table. We
937 will fill in the contents of the procedure linkage table later,
938 when we know the address of the .got section. */
939 if (h->type == STT_FUNC
940 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
941 {
942 if (! info->shared
943 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
944 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
945 /* We must always create the plt entry if it was referenced
946 by a PLTxxO relocation. In this case we already recorded
947 it as a dynamic symbol. */
948 && h->dynindx == -1)
949 {
950 /* This case can occur if we saw a PLTxx reloc in an input
951 file, but the symbol was never referred to by a dynamic
952 object. In such a case, we don't actually need to build
953 a procedure linkage table, and we can just do a PCxx
954 reloc instead. */
955 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
956 h->plt.offset = (bfd_vma) -1;
957 return TRUE;
958 }
959
960 /* GC may have rendered this entry unused. */
961 if (h->plt.refcount <= 0)
962 {
963 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
964 h->plt.offset = (bfd_vma) -1;
965 return TRUE;
966 }
967
968 /* Make sure this symbol is output as a dynamic symbol. */
969 if (h->dynindx == -1
970 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
971 {
972 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
973 return FALSE;
974 }
975
976 s = bfd_get_section_by_name (dynobj, ".plt");
977 BFD_ASSERT (s != NULL);
978
979 /* If this is the first .plt entry, make room for the special
980 first entry. */
981 if (s->_raw_size == 0)
982 {
983 if (CPU32_FLAG (dynobj))
984 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
985 else
986 s->_raw_size += PLT_ENTRY_SIZE;
987 }
988
989 /* If this symbol is not defined in a regular file, and we are
990 not generating a shared library, then set the symbol to this
991 location in the .plt. This is required to make function
992 pointers compare as equal between the normal executable and
993 the shared library. */
994 if (!info->shared
995 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
996 {
997 h->root.u.def.section = s;
998 h->root.u.def.value = s->_raw_size;
999 }
1000
1001 h->plt.offset = s->_raw_size;
1002
1003 /* Make room for this entry. */
1004 if (CPU32_FLAG (dynobj))
1005 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1006 else
1007 s->_raw_size += PLT_ENTRY_SIZE;
1008
1009 /* We also need to make an entry in the .got.plt section, which
1010 will be placed in the .got section by the linker script. */
1011 s = bfd_get_section_by_name (dynobj, ".got.plt");
1012 BFD_ASSERT (s != NULL);
1013 s->_raw_size += 4;
1014
1015 /* We also need to make an entry in the .rela.plt section. */
1016 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1017 BFD_ASSERT (s != NULL);
1018 s->_raw_size += sizeof (Elf32_External_Rela);
1019
1020 return TRUE;
1021 }
1022
1023 /* Reinitialize the plt offset now that it is not used as a reference
1024 count any more. */
1025 h->plt.offset = (bfd_vma) -1;
1026
1027 /* If this is a weak symbol, and there is a real definition, the
1028 processor independent code will have arranged for us to see the
1029 real definition first, and we can just use the same value. */
1030 if (h->weakdef != NULL)
1031 {
1032 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1033 || h->weakdef->root.type == bfd_link_hash_defweak);
1034 h->root.u.def.section = h->weakdef->root.u.def.section;
1035 h->root.u.def.value = h->weakdef->root.u.def.value;
1036 return TRUE;
1037 }
1038
1039 /* This is a reference to a symbol defined by a dynamic object which
1040 is not a function. */
1041
1042 /* If we are creating a shared library, we must presume that the
1043 only references to the symbol are via the global offset table.
1044 For such cases we need not do anything here; the relocations will
1045 be handled correctly by relocate_section. */
1046 if (info->shared)
1047 return TRUE;
1048
1049 /* We must allocate the symbol in our .dynbss section, which will
1050 become part of the .bss section of the executable. There will be
1051 an entry for this symbol in the .dynsym section. The dynamic
1052 object will contain position independent code, so all references
1053 from the dynamic object to this symbol will go through the global
1054 offset table. The dynamic linker will use the .dynsym entry to
1055 determine the address it must put in the global offset table, so
1056 both the dynamic object and the regular object will refer to the
1057 same memory location for the variable. */
1058
1059 s = bfd_get_section_by_name (dynobj, ".dynbss");
1060 BFD_ASSERT (s != NULL);
1061
1062 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1063 copy the initial value out of the dynamic object and into the
1064 runtime process image. We need to remember the offset into the
1065 .rela.bss section we are going to use. */
1066 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1067 {
1068 asection *srel;
1069
1070 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1071 BFD_ASSERT (srel != NULL);
1072 srel->_raw_size += sizeof (Elf32_External_Rela);
1073 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1074 }
1075
1076 /* We need to figure out the alignment required for this symbol. I
1077 have no idea how ELF linkers handle this. */
1078 power_of_two = bfd_log2 (h->size);
1079 if (power_of_two > 3)
1080 power_of_two = 3;
1081
1082 /* Apply the required alignment. */
1083 s->_raw_size = BFD_ALIGN (s->_raw_size,
1084 (bfd_size_type) (1 << power_of_two));
1085 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1086 {
1087 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1088 return FALSE;
1089 }
1090
1091 /* Define the symbol as being at this point in the section. */
1092 h->root.u.def.section = s;
1093 h->root.u.def.value = s->_raw_size;
1094
1095 /* Increment the section size to make room for the symbol. */
1096 s->_raw_size += h->size;
1097
1098 return TRUE;
1099 }
1100
1101 /* This is the condition under which elf_m68k_finish_dynamic_symbol
1102 will be called from elflink.h. If elflink.h doesn't call our
1103 finish_dynamic_symbol routine, we'll need to do something about
1104 initializing any .plt and .got entries in elf_m68k_relocate_section. */
1105 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1106 ((DYN) \
1107 && ((SHARED) \
1108 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1109 && ((H)->dynindx != -1 \
1110 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1111
1112 /* Set the sizes of the dynamic sections. */
1113
1114 static bfd_boolean
1115 elf_m68k_size_dynamic_sections (output_bfd, info)
1116 bfd *output_bfd ATTRIBUTE_UNUSED;
1117 struct bfd_link_info *info;
1118 {
1119 bfd *dynobj;
1120 asection *s;
1121 bfd_boolean plt;
1122 bfd_boolean relocs;
1123
1124 dynobj = elf_hash_table (info)->dynobj;
1125 BFD_ASSERT (dynobj != NULL);
1126
1127 if (elf_hash_table (info)->dynamic_sections_created)
1128 {
1129 /* Set the contents of the .interp section to the interpreter. */
1130 if (!info->shared)
1131 {
1132 s = bfd_get_section_by_name (dynobj, ".interp");
1133 BFD_ASSERT (s != NULL);
1134 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1135 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1136 }
1137 }
1138 else
1139 {
1140 /* We may have created entries in the .rela.got section.
1141 However, if we are not creating the dynamic sections, we will
1142 not actually use these entries. Reset the size of .rela.got,
1143 which will cause it to get stripped from the output file
1144 below. */
1145 s = bfd_get_section_by_name (dynobj, ".rela.got");
1146 if (s != NULL)
1147 s->_raw_size = 0;
1148 }
1149
1150 /* If this is a -Bsymbolic shared link, then we need to discard all
1151 PC relative relocs against symbols defined in a regular object.
1152 For the normal shared case we discard the PC relative relocs
1153 against symbols that have become local due to visibility changes.
1154 We allocated space for them in the check_relocs routine, but we
1155 will not fill them in in the relocate_section routine. */
1156 if (info->shared)
1157 elf_link_hash_traverse (elf_hash_table (info),
1158 elf_m68k_discard_copies,
1159 (PTR) info);
1160
1161 /* The check_relocs and adjust_dynamic_symbol entry points have
1162 determined the sizes of the various dynamic sections. Allocate
1163 memory for them. */
1164 plt = FALSE;
1165 relocs = FALSE;
1166 for (s = dynobj->sections; s != NULL; s = s->next)
1167 {
1168 const char *name;
1169 bfd_boolean strip;
1170
1171 if ((s->flags & SEC_LINKER_CREATED) == 0)
1172 continue;
1173
1174 /* It's OK to base decisions on the section name, because none
1175 of the dynobj section names depend upon the input files. */
1176 name = bfd_get_section_name (dynobj, s);
1177
1178 strip = FALSE;
1179
1180 if (strcmp (name, ".plt") == 0)
1181 {
1182 if (s->_raw_size == 0)
1183 {
1184 /* Strip this section if we don't need it; see the
1185 comment below. */
1186 strip = TRUE;
1187 }
1188 else
1189 {
1190 /* Remember whether there is a PLT. */
1191 plt = TRUE;
1192 }
1193 }
1194 else if (strncmp (name, ".rela", 5) == 0)
1195 {
1196 if (s->_raw_size == 0)
1197 {
1198 /* If we don't need this section, strip it from the
1199 output file. This is mostly to handle .rela.bss and
1200 .rela.plt. We must create both sections in
1201 create_dynamic_sections, because they must be created
1202 before the linker maps input sections to output
1203 sections. The linker does that before
1204 adjust_dynamic_symbol is called, and it is that
1205 function which decides whether anything needs to go
1206 into these sections. */
1207 strip = TRUE;
1208 }
1209 else
1210 {
1211 relocs = TRUE;
1212
1213 /* We use the reloc_count field as a counter if we need
1214 to copy relocs into the output file. */
1215 s->reloc_count = 0;
1216 }
1217 }
1218 else if (strncmp (name, ".got", 4) != 0)
1219 {
1220 /* It's not one of our sections, so don't allocate space. */
1221 continue;
1222 }
1223
1224 if (strip)
1225 {
1226 _bfd_strip_section_from_output (info, s);
1227 continue;
1228 }
1229
1230 /* Allocate memory for the section contents. */
1231 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1232 Unused entries should be reclaimed before the section's contents
1233 are written out, but at the moment this does not happen. Thus in
1234 order to prevent writing out garbage, we initialise the section's
1235 contents to zero. */
1236 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1237 if (s->contents == NULL && s->_raw_size != 0)
1238 return FALSE;
1239 }
1240
1241 if (elf_hash_table (info)->dynamic_sections_created)
1242 {
1243 /* Add some entries to the .dynamic section. We fill in the
1244 values later, in elf_m68k_finish_dynamic_sections, but we
1245 must add the entries now so that we get the correct size for
1246 the .dynamic section. The DT_DEBUG entry is filled in by the
1247 dynamic linker and used by the debugger. */
1248 #define add_dynamic_entry(TAG, VAL) \
1249 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1250
1251 if (!info->shared)
1252 {
1253 if (!add_dynamic_entry (DT_DEBUG, 0))
1254 return FALSE;
1255 }
1256
1257 if (plt)
1258 {
1259 if (!add_dynamic_entry (DT_PLTGOT, 0)
1260 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1261 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1262 || !add_dynamic_entry (DT_JMPREL, 0))
1263 return FALSE;
1264 }
1265
1266 if (relocs)
1267 {
1268 if (!add_dynamic_entry (DT_RELA, 0)
1269 || !add_dynamic_entry (DT_RELASZ, 0)
1270 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1271 return FALSE;
1272 }
1273
1274 if ((info->flags & DF_TEXTREL) != 0)
1275 {
1276 if (!add_dynamic_entry (DT_TEXTREL, 0))
1277 return FALSE;
1278 }
1279 }
1280 #undef add_dynamic_entry
1281
1282 return TRUE;
1283 }
1284
1285 /* This function is called via elf_link_hash_traverse if we are
1286 creating a shared object. In the -Bsymbolic case it discards the
1287 space allocated to copy PC relative relocs against symbols which
1288 are defined in regular objects. For the normal shared case, it
1289 discards space for pc-relative relocs that have become local due to
1290 symbol visibility changes. We allocated space for them in the
1291 check_relocs routine, but we won't fill them in in the
1292 relocate_section routine.
1293
1294 We also check whether any of the remaining relocations apply
1295 against a readonly section, and set the DF_TEXTREL flag in this
1296 case. */
1297
1298 static bfd_boolean
1299 elf_m68k_discard_copies (h, inf)
1300 struct elf_link_hash_entry *h;
1301 PTR inf;
1302 {
1303 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1304 struct elf_m68k_pcrel_relocs_copied *s;
1305
1306 if (h->root.type == bfd_link_hash_warning)
1307 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1308
1309 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
1310 || (!info->symbolic
1311 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0))
1312 {
1313 if ((info->flags & DF_TEXTREL) == 0)
1314 {
1315 /* Look for relocations against read-only sections. */
1316 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1317 s != NULL;
1318 s = s->next)
1319 if ((s->section->flags & SEC_READONLY) != 0)
1320 {
1321 info->flags |= DF_TEXTREL;
1322 break;
1323 }
1324 }
1325
1326 return TRUE;
1327 }
1328
1329 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1330 s != NULL;
1331 s = s->next)
1332 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1333
1334 return TRUE;
1335 }
1336
1337 /* Relocate an M68K ELF section. */
1338
1339 static bfd_boolean
1340 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1341 contents, relocs, local_syms, local_sections)
1342 bfd *output_bfd;
1343 struct bfd_link_info *info;
1344 bfd *input_bfd;
1345 asection *input_section;
1346 bfd_byte *contents;
1347 Elf_Internal_Rela *relocs;
1348 Elf_Internal_Sym *local_syms;
1349 asection **local_sections;
1350 {
1351 bfd *dynobj;
1352 Elf_Internal_Shdr *symtab_hdr;
1353 struct elf_link_hash_entry **sym_hashes;
1354 bfd_vma *local_got_offsets;
1355 asection *sgot;
1356 asection *splt;
1357 asection *sreloc;
1358 Elf_Internal_Rela *rel;
1359 Elf_Internal_Rela *relend;
1360
1361 if (info->relocatable)
1362 return TRUE;
1363
1364 dynobj = elf_hash_table (info)->dynobj;
1365 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1366 sym_hashes = elf_sym_hashes (input_bfd);
1367 local_got_offsets = elf_local_got_offsets (input_bfd);
1368
1369 sgot = NULL;
1370 splt = NULL;
1371 sreloc = NULL;
1372
1373 rel = relocs;
1374 relend = relocs + input_section->reloc_count;
1375 for (; rel < relend; rel++)
1376 {
1377 int r_type;
1378 reloc_howto_type *howto;
1379 unsigned long r_symndx;
1380 struct elf_link_hash_entry *h;
1381 Elf_Internal_Sym *sym;
1382 asection *sec;
1383 bfd_vma relocation;
1384 bfd_boolean unresolved_reloc;
1385 bfd_reloc_status_type r;
1386
1387 r_type = ELF32_R_TYPE (rel->r_info);
1388 if (r_type < 0 || r_type >= (int) R_68K_max)
1389 {
1390 bfd_set_error (bfd_error_bad_value);
1391 return FALSE;
1392 }
1393 howto = howto_table + r_type;
1394
1395 r_symndx = ELF32_R_SYM (rel->r_info);
1396
1397 h = NULL;
1398 sym = NULL;
1399 sec = NULL;
1400 unresolved_reloc = FALSE;
1401
1402 if (r_symndx < symtab_hdr->sh_info)
1403 {
1404 sym = local_syms + r_symndx;
1405 sec = local_sections[r_symndx];
1406 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
1407 }
1408 else
1409 {
1410 bfd_boolean warned;
1411
1412 RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx, symtab_hdr, relocation, sec, unresolved_reloc, info, warned);
1413 }
1414
1415 switch (r_type)
1416 {
1417 case R_68K_GOT8:
1418 case R_68K_GOT16:
1419 case R_68K_GOT32:
1420 /* Relocation is to the address of the entry for this symbol
1421 in the global offset table. */
1422 if (h != NULL
1423 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1424 break;
1425 /* Fall through. */
1426 case R_68K_GOT8O:
1427 case R_68K_GOT16O:
1428 case R_68K_GOT32O:
1429 /* Relocation is the offset of the entry for this symbol in
1430 the global offset table. */
1431
1432 {
1433 bfd_vma off;
1434
1435 if (sgot == NULL)
1436 {
1437 sgot = bfd_get_section_by_name (dynobj, ".got");
1438 BFD_ASSERT (sgot != NULL);
1439 }
1440
1441 if (h != NULL)
1442 {
1443 bfd_boolean dyn;
1444
1445 off = h->got.offset;
1446 BFD_ASSERT (off != (bfd_vma) -1);
1447
1448 dyn = elf_hash_table (info)->dynamic_sections_created;
1449 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1450 || (info->shared
1451 && (info->symbolic
1452 || h->dynindx == -1
1453 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
1454 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) != 0)
1455 {
1456 /* This is actually a static link, or it is a
1457 -Bsymbolic link and the symbol is defined
1458 locally, or the symbol was forced to be local
1459 because of a version file.. We must initialize
1460 this entry in the global offset table. Since
1461 the offset must always be a multiple of 4, we
1462 use the least significant bit to record whether
1463 we have initialized it already.
1464
1465 When doing a dynamic link, we create a .rela.got
1466 relocation entry to initialize the value. This
1467 is done in the finish_dynamic_symbol routine. */
1468 if ((off & 1) != 0)
1469 off &= ~1;
1470 else
1471 {
1472 bfd_put_32 (output_bfd, relocation,
1473 sgot->contents + off);
1474 h->got.offset |= 1;
1475 }
1476 }
1477 else
1478 unresolved_reloc = FALSE;
1479 }
1480 else
1481 {
1482 BFD_ASSERT (local_got_offsets != NULL
1483 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1484
1485 off = local_got_offsets[r_symndx];
1486
1487 /* The offset must always be a multiple of 4. We use
1488 the least significant bit to record whether we have
1489 already generated the necessary reloc. */
1490 if ((off & 1) != 0)
1491 off &= ~1;
1492 else
1493 {
1494 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1495
1496 if (info->shared)
1497 {
1498 asection *s;
1499 Elf_Internal_Rela outrel;
1500 bfd_byte *loc;
1501
1502 s = bfd_get_section_by_name (dynobj, ".rela.got");
1503 BFD_ASSERT (s != NULL);
1504
1505 outrel.r_offset = (sgot->output_section->vma
1506 + sgot->output_offset
1507 + off);
1508 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1509 outrel.r_addend = relocation;
1510 loc = s->contents;
1511 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1512 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1513 }
1514
1515 local_got_offsets[r_symndx] |= 1;
1516 }
1517 }
1518
1519 relocation = sgot->output_offset + off;
1520 if (r_type == R_68K_GOT8O
1521 || r_type == R_68K_GOT16O
1522 || r_type == R_68K_GOT32O)
1523 {
1524 /* This relocation does not use the addend. */
1525 rel->r_addend = 0;
1526 }
1527 else
1528 relocation += sgot->output_section->vma;
1529 }
1530 break;
1531
1532 case R_68K_PLT8:
1533 case R_68K_PLT16:
1534 case R_68K_PLT32:
1535 /* Relocation is to the entry for this symbol in the
1536 procedure linkage table. */
1537
1538 /* Resolve a PLTxx reloc against a local symbol directly,
1539 without using the procedure linkage table. */
1540 if (h == NULL)
1541 break;
1542
1543 if (h->plt.offset == (bfd_vma) -1
1544 || !elf_hash_table (info)->dynamic_sections_created)
1545 {
1546 /* We didn't make a PLT entry for this symbol. This
1547 happens when statically linking PIC code, or when
1548 using -Bsymbolic. */
1549 break;
1550 }
1551
1552 if (splt == NULL)
1553 {
1554 splt = bfd_get_section_by_name (dynobj, ".plt");
1555 BFD_ASSERT (splt != NULL);
1556 }
1557
1558 relocation = (splt->output_section->vma
1559 + splt->output_offset
1560 + h->plt.offset);
1561 unresolved_reloc = FALSE;
1562 break;
1563
1564 case R_68K_PLT8O:
1565 case R_68K_PLT16O:
1566 case R_68K_PLT32O:
1567 /* Relocation is the offset of the entry for this symbol in
1568 the procedure linkage table. */
1569 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1570
1571 if (splt == NULL)
1572 {
1573 splt = bfd_get_section_by_name (dynobj, ".plt");
1574 BFD_ASSERT (splt != NULL);
1575 }
1576
1577 relocation = h->plt.offset;
1578 unresolved_reloc = FALSE;
1579
1580 /* This relocation does not use the addend. */
1581 rel->r_addend = 0;
1582
1583 break;
1584
1585 case R_68K_PC8:
1586 case R_68K_PC16:
1587 case R_68K_PC32:
1588 if (h == NULL
1589 || (info->shared
1590 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1591 break;
1592 /* Fall through. */
1593 case R_68K_8:
1594 case R_68K_16:
1595 case R_68K_32:
1596 if (info->shared
1597 && r_symndx != 0
1598 && (input_section->flags & SEC_ALLOC) != 0
1599 && (h == NULL
1600 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1601 || h->root.type != bfd_link_hash_undefweak)
1602 && ((r_type != R_68K_PC8
1603 && r_type != R_68K_PC16
1604 && r_type != R_68K_PC32)
1605 || (h != NULL
1606 && h->dynindx != -1
1607 && (!info->symbolic
1608 || (h->elf_link_hash_flags
1609 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1610 {
1611 Elf_Internal_Rela outrel;
1612 bfd_byte *loc;
1613 bfd_boolean skip, relocate;
1614
1615 /* When generating a shared object, these relocations
1616 are copied into the output file to be resolved at run
1617 time. */
1618
1619 skip = FALSE;
1620 relocate = FALSE;
1621
1622 outrel.r_offset =
1623 _bfd_elf_section_offset (output_bfd, info, input_section,
1624 rel->r_offset);
1625 if (outrel.r_offset == (bfd_vma) -1)
1626 skip = TRUE;
1627 else if (outrel.r_offset == (bfd_vma) -2)
1628 skip = TRUE, relocate = TRUE;
1629 outrel.r_offset += (input_section->output_section->vma
1630 + input_section->output_offset);
1631
1632 if (skip)
1633 memset (&outrel, 0, sizeof outrel);
1634 else if (h != NULL
1635 && h->dynindx != -1
1636 && (r_type == R_68K_PC8
1637 || r_type == R_68K_PC16
1638 || r_type == R_68K_PC32
1639 || !info->shared
1640 || !info->symbolic
1641 || (h->elf_link_hash_flags
1642 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1643 {
1644 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1645 outrel.r_addend = rel->r_addend;
1646 }
1647 else
1648 {
1649 /* This symbol is local, or marked to become local. */
1650 if (r_type == R_68K_32)
1651 {
1652 relocate = TRUE;
1653 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1654 outrel.r_addend = relocation + rel->r_addend;
1655 }
1656 else
1657 {
1658 long indx;
1659
1660 if (h == NULL)
1661 sec = local_sections[r_symndx];
1662 else
1663 {
1664 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1665 || (h->root.type
1666 == bfd_link_hash_defweak));
1667 sec = h->root.u.def.section;
1668 }
1669 if (sec != NULL && bfd_is_abs_section (sec))
1670 indx = 0;
1671 else if (sec == NULL || sec->owner == NULL)
1672 {
1673 bfd_set_error (bfd_error_bad_value);
1674 return FALSE;
1675 }
1676 else
1677 {
1678 asection *osec;
1679
1680 osec = sec->output_section;
1681 indx = elf_section_data (osec)->dynindx;
1682 BFD_ASSERT (indx > 0);
1683 }
1684
1685 outrel.r_info = ELF32_R_INFO (indx, r_type);
1686 outrel.r_addend = relocation + rel->r_addend;
1687 }
1688 }
1689
1690 sreloc = elf_section_data (input_section)->sreloc;
1691 if (sreloc == NULL)
1692 abort ();
1693
1694 loc = sreloc->contents;
1695 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1696 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1697
1698 /* This reloc will be computed at runtime, so there's no
1699 need to do anything now, except for R_68K_32
1700 relocations that have been turned into
1701 R_68K_RELATIVE. */
1702 if (!relocate)
1703 continue;
1704 }
1705
1706 break;
1707
1708 case R_68K_GNU_VTINHERIT:
1709 case R_68K_GNU_VTENTRY:
1710 /* These are no-ops in the end. */
1711 continue;
1712
1713 default:
1714 break;
1715 }
1716
1717 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1718 because such sections are not SEC_ALLOC and thus ld.so will
1719 not process them. */
1720 if (unresolved_reloc
1721 && !((input_section->flags & SEC_DEBUGGING) != 0
1722 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1723 {
1724 (*_bfd_error_handler)
1725 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
1726 bfd_archive_filename (input_bfd),
1727 bfd_get_section_name (input_bfd, input_section),
1728 (long) rel->r_offset,
1729 h->root.root.string);
1730 return FALSE;
1731 }
1732
1733 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1734 contents, rel->r_offset,
1735 relocation, rel->r_addend);
1736
1737 if (r != bfd_reloc_ok)
1738 {
1739 const char *name;
1740
1741 if (h != NULL)
1742 name = h->root.root.string;
1743 else
1744 {
1745 name = bfd_elf_string_from_elf_section (input_bfd,
1746 symtab_hdr->sh_link,
1747 sym->st_name);
1748 if (name == NULL)
1749 return FALSE;
1750 if (*name == '\0')
1751 name = bfd_section_name (input_bfd, sec);
1752 }
1753
1754 if (r == bfd_reloc_overflow)
1755 {
1756 if (!(info->callbacks->reloc_overflow
1757 (info, name, howto->name, (bfd_vma) 0,
1758 input_bfd, input_section, rel->r_offset)))
1759 return FALSE;
1760 }
1761 else
1762 {
1763 (*_bfd_error_handler)
1764 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
1765 bfd_archive_filename (input_bfd),
1766 bfd_get_section_name (input_bfd, input_section),
1767 (long) rel->r_offset, name, (int) r);
1768 return FALSE;
1769 }
1770 }
1771 }
1772
1773 return TRUE;
1774 }
1775
1776 /* Finish up dynamic symbol handling. We set the contents of various
1777 dynamic sections here. */
1778
1779 static bfd_boolean
1780 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1781 bfd *output_bfd;
1782 struct bfd_link_info *info;
1783 struct elf_link_hash_entry *h;
1784 Elf_Internal_Sym *sym;
1785 {
1786 bfd *dynobj;
1787 int plt_off1, plt_off2, plt_off3;
1788
1789 dynobj = elf_hash_table (info)->dynobj;
1790
1791 if (h->plt.offset != (bfd_vma) -1)
1792 {
1793 asection *splt;
1794 asection *sgot;
1795 asection *srela;
1796 bfd_vma plt_index;
1797 bfd_vma got_offset;
1798 Elf_Internal_Rela rela;
1799 bfd_byte *loc;
1800
1801 /* This symbol has an entry in the procedure linkage table. Set
1802 it up. */
1803
1804 BFD_ASSERT (h->dynindx != -1);
1805
1806 splt = bfd_get_section_by_name (dynobj, ".plt");
1807 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1808 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1809 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1810
1811 /* Get the index in the procedure linkage table which
1812 corresponds to this symbol. This is the index of this symbol
1813 in all the symbols for which we are making plt entries. The
1814 first entry in the procedure linkage table is reserved. */
1815 if ( CPU32_FLAG (output_bfd))
1816 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1817 else
1818 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1819
1820 /* Get the offset into the .got table of the entry that
1821 corresponds to this function. Each .got entry is 4 bytes.
1822 The first three are reserved. */
1823 got_offset = (plt_index + 3) * 4;
1824
1825 if ( CPU32_FLAG (output_bfd))
1826 {
1827 /* Fill in the entry in the procedure linkage table. */
1828 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1829 PLT_CPU32_ENTRY_SIZE);
1830 plt_off1 = 4;
1831 plt_off2 = 12;
1832 plt_off3 = 18;
1833 }
1834 else
1835 {
1836 /* Fill in the entry in the procedure linkage table. */
1837 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1838 PLT_ENTRY_SIZE);
1839 plt_off1 = 4;
1840 plt_off2 = 10;
1841 plt_off3 = 16;
1842 }
1843
1844 /* The offset is relative to the first extension word. */
1845 bfd_put_32 (output_bfd,
1846 (sgot->output_section->vma
1847 + sgot->output_offset
1848 + got_offset
1849 - (splt->output_section->vma
1850 + h->plt.offset + 2)),
1851 splt->contents + h->plt.offset + plt_off1);
1852
1853 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1854 splt->contents + h->plt.offset + plt_off2);
1855 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1856 splt->contents + h->plt.offset + plt_off3);
1857
1858 /* Fill in the entry in the global offset table. */
1859 bfd_put_32 (output_bfd,
1860 (splt->output_section->vma
1861 + splt->output_offset
1862 + h->plt.offset
1863 + 8),
1864 sgot->contents + got_offset);
1865
1866 /* Fill in the entry in the .rela.plt section. */
1867 rela.r_offset = (sgot->output_section->vma
1868 + sgot->output_offset
1869 + got_offset);
1870 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1871 rela.r_addend = 0;
1872 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1873 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1874
1875 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1876 {
1877 /* Mark the symbol as undefined, rather than as defined in
1878 the .plt section. Leave the value alone. */
1879 sym->st_shndx = SHN_UNDEF;
1880 }
1881 }
1882
1883 if (h->got.offset != (bfd_vma) -1)
1884 {
1885 asection *sgot;
1886 asection *srela;
1887 Elf_Internal_Rela rela;
1888 bfd_byte *loc;
1889
1890 /* This symbol has an entry in the global offset table. Set it
1891 up. */
1892
1893 sgot = bfd_get_section_by_name (dynobj, ".got");
1894 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1895 BFD_ASSERT (sgot != NULL && srela != NULL);
1896
1897 rela.r_offset = (sgot->output_section->vma
1898 + sgot->output_offset
1899 + (h->got.offset &~ (bfd_vma) 1));
1900
1901 /* If this is a -Bsymbolic link, and the symbol is defined
1902 locally, we just want to emit a RELATIVE reloc. Likewise if
1903 the symbol was forced to be local because of a version file.
1904 The entry in the global offset table will already have been
1905 initialized in the relocate_section function. */
1906 if (info->shared
1907 && (info->symbolic
1908 || h->dynindx == -1
1909 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
1910 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1911 {
1912 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1913 rela.r_addend = bfd_get_signed_32 (output_bfd,
1914 (sgot->contents
1915 + (h->got.offset &~ (bfd_vma) 1)));
1916 }
1917 else
1918 {
1919 bfd_put_32 (output_bfd, (bfd_vma) 0,
1920 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1921 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1922 rela.r_addend = 0;
1923 }
1924
1925 loc = srela->contents;
1926 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1927 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1928 }
1929
1930 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1931 {
1932 asection *s;
1933 Elf_Internal_Rela rela;
1934 bfd_byte *loc;
1935
1936 /* This symbol needs a copy reloc. Set it up. */
1937
1938 BFD_ASSERT (h->dynindx != -1
1939 && (h->root.type == bfd_link_hash_defined
1940 || h->root.type == bfd_link_hash_defweak));
1941
1942 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1943 ".rela.bss");
1944 BFD_ASSERT (s != NULL);
1945
1946 rela.r_offset = (h->root.u.def.value
1947 + h->root.u.def.section->output_section->vma
1948 + h->root.u.def.section->output_offset);
1949 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1950 rela.r_addend = 0;
1951 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1952 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1953 }
1954
1955 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1956 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1957 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1958 sym->st_shndx = SHN_ABS;
1959
1960 return TRUE;
1961 }
1962
1963 /* Finish up the dynamic sections. */
1964
1965 static bfd_boolean
1966 elf_m68k_finish_dynamic_sections (output_bfd, info)
1967 bfd *output_bfd;
1968 struct bfd_link_info *info;
1969 {
1970 bfd *dynobj;
1971 asection *sgot;
1972 asection *sdyn;
1973
1974 dynobj = elf_hash_table (info)->dynobj;
1975
1976 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1977 BFD_ASSERT (sgot != NULL);
1978 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1979
1980 if (elf_hash_table (info)->dynamic_sections_created)
1981 {
1982 asection *splt;
1983 Elf32_External_Dyn *dyncon, *dynconend;
1984
1985 splt = bfd_get_section_by_name (dynobj, ".plt");
1986 BFD_ASSERT (splt != NULL && sdyn != NULL);
1987
1988 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1989 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1990 for (; dyncon < dynconend; dyncon++)
1991 {
1992 Elf_Internal_Dyn dyn;
1993 const char *name;
1994 asection *s;
1995
1996 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1997
1998 switch (dyn.d_tag)
1999 {
2000 default:
2001 break;
2002
2003 case DT_PLTGOT:
2004 name = ".got";
2005 goto get_vma;
2006 case DT_JMPREL:
2007 name = ".rela.plt";
2008 get_vma:
2009 s = bfd_get_section_by_name (output_bfd, name);
2010 BFD_ASSERT (s != NULL);
2011 dyn.d_un.d_ptr = s->vma;
2012 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2013 break;
2014
2015 case DT_PLTRELSZ:
2016 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2017 BFD_ASSERT (s != NULL);
2018 if (s->_cooked_size != 0)
2019 dyn.d_un.d_val = s->_cooked_size;
2020 else
2021 dyn.d_un.d_val = s->_raw_size;
2022 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2023 break;
2024
2025 case DT_RELASZ:
2026 /* The procedure linkage table relocs (DT_JMPREL) should
2027 not be included in the overall relocs (DT_RELA).
2028 Therefore, we override the DT_RELASZ entry here to
2029 make it not include the JMPREL relocs. Since the
2030 linker script arranges for .rela.plt to follow all
2031 other relocation sections, we don't have to worry
2032 about changing the DT_RELA entry. */
2033 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2034 if (s != NULL)
2035 {
2036 if (s->_cooked_size != 0)
2037 dyn.d_un.d_val -= s->_cooked_size;
2038 else
2039 dyn.d_un.d_val -= s->_raw_size;
2040 }
2041 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2042 break;
2043 }
2044 }
2045
2046 /* Fill in the first entry in the procedure linkage table. */
2047 if (splt->_raw_size > 0)
2048 {
2049 if (!CPU32_FLAG (output_bfd))
2050 {
2051 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2052 bfd_put_32 (output_bfd,
2053 (sgot->output_section->vma
2054 + sgot->output_offset + 4
2055 - (splt->output_section->vma + 2)),
2056 splt->contents + 4);
2057 bfd_put_32 (output_bfd,
2058 (sgot->output_section->vma
2059 + sgot->output_offset + 8
2060 - (splt->output_section->vma + 10)),
2061 splt->contents + 12);
2062 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2063 = PLT_ENTRY_SIZE;
2064 }
2065 else /* cpu32 */
2066 {
2067 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2068 bfd_put_32 (output_bfd,
2069 (sgot->output_section->vma
2070 + sgot->output_offset + 4
2071 - (splt->output_section->vma + 2)),
2072 splt->contents + 4);
2073 bfd_put_32 (output_bfd,
2074 (sgot->output_section->vma
2075 + sgot->output_offset + 8
2076 - (splt->output_section->vma + 10)),
2077 splt->contents + 12);
2078 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2079 = PLT_CPU32_ENTRY_SIZE;
2080 }
2081 }
2082 }
2083
2084 /* Fill in the first three entries in the global offset table. */
2085 if (sgot->_raw_size > 0)
2086 {
2087 if (sdyn == NULL)
2088 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2089 else
2090 bfd_put_32 (output_bfd,
2091 sdyn->output_section->vma + sdyn->output_offset,
2092 sgot->contents);
2093 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2094 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2095 }
2096
2097 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2098
2099 return TRUE;
2100 }
2101
2102 /* Given a .data section and a .emreloc in-memory section, store
2103 relocation information into the .emreloc section which can be
2104 used at runtime to relocate the section. This is called by the
2105 linker when the --embedded-relocs switch is used. This is called
2106 after the add_symbols entry point has been called for all the
2107 objects, and before the final_link entry point is called. */
2108
2109 bfd_boolean
2110 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2111 bfd *abfd;
2112 struct bfd_link_info *info;
2113 asection *datasec;
2114 asection *relsec;
2115 char **errmsg;
2116 {
2117 Elf_Internal_Shdr *symtab_hdr;
2118 Elf_Internal_Sym *isymbuf = NULL;
2119 Elf_Internal_Rela *internal_relocs = NULL;
2120 Elf_Internal_Rela *irel, *irelend;
2121 bfd_byte *p;
2122 bfd_size_type amt;
2123
2124 BFD_ASSERT (! info->relocatable);
2125
2126 *errmsg = NULL;
2127
2128 if (datasec->reloc_count == 0)
2129 return TRUE;
2130
2131 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2132
2133 /* Get a copy of the native relocations. */
2134 internal_relocs = (_bfd_elf_link_read_relocs
2135 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2136 info->keep_memory));
2137 if (internal_relocs == NULL)
2138 goto error_return;
2139
2140 amt = (bfd_size_type) datasec->reloc_count * 12;
2141 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2142 if (relsec->contents == NULL)
2143 goto error_return;
2144
2145 p = relsec->contents;
2146
2147 irelend = internal_relocs + datasec->reloc_count;
2148 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2149 {
2150 asection *targetsec;
2151
2152 /* We are going to write a four byte longword into the runtime
2153 reloc section. The longword will be the address in the data
2154 section which must be relocated. It is followed by the name
2155 of the target section NUL-padded or truncated to 8
2156 characters. */
2157
2158 /* We can only relocate absolute longword relocs at run time. */
2159 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2160 {
2161 *errmsg = _("unsupported reloc type");
2162 bfd_set_error (bfd_error_bad_value);
2163 goto error_return;
2164 }
2165
2166 /* Get the target section referred to by the reloc. */
2167 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2168 {
2169 /* A local symbol. */
2170 Elf_Internal_Sym *isym;
2171
2172 /* Read this BFD's local symbols if we haven't done so already. */
2173 if (isymbuf == NULL)
2174 {
2175 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2176 if (isymbuf == NULL)
2177 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2178 symtab_hdr->sh_info, 0,
2179 NULL, NULL, NULL);
2180 if (isymbuf == NULL)
2181 goto error_return;
2182 }
2183
2184 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2185 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2186 }
2187 else
2188 {
2189 unsigned long indx;
2190 struct elf_link_hash_entry *h;
2191
2192 /* An external symbol. */
2193 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2194 h = elf_sym_hashes (abfd)[indx];
2195 BFD_ASSERT (h != NULL);
2196 if (h->root.type == bfd_link_hash_defined
2197 || h->root.type == bfd_link_hash_defweak)
2198 targetsec = h->root.u.def.section;
2199 else
2200 targetsec = NULL;
2201 }
2202
2203 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2204 memset (p + 4, 0, 8);
2205 if (targetsec != NULL)
2206 strncpy (p + 4, targetsec->output_section->name, 8);
2207 }
2208
2209 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2210 free (isymbuf);
2211 if (internal_relocs != NULL
2212 && elf_section_data (datasec)->relocs != internal_relocs)
2213 free (internal_relocs);
2214 return TRUE;
2215
2216 error_return:
2217 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2218 free (isymbuf);
2219 if (internal_relocs != NULL
2220 && elf_section_data (datasec)->relocs != internal_relocs)
2221 free (internal_relocs);
2222 return FALSE;
2223 }
2224
2225 static enum elf_reloc_type_class
2226 elf32_m68k_reloc_type_class (rela)
2227 const Elf_Internal_Rela *rela;
2228 {
2229 switch ((int) ELF32_R_TYPE (rela->r_info))
2230 {
2231 case R_68K_RELATIVE:
2232 return reloc_class_relative;
2233 case R_68K_JMP_SLOT:
2234 return reloc_class_plt;
2235 case R_68K_COPY:
2236 return reloc_class_copy;
2237 default:
2238 return reloc_class_normal;
2239 }
2240 }
2241
2242 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2243 #define TARGET_BIG_NAME "elf32-m68k"
2244 #define ELF_MACHINE_CODE EM_68K
2245 #define ELF_MAXPAGESIZE 0x2000
2246 #define elf_backend_create_dynamic_sections \
2247 _bfd_elf_create_dynamic_sections
2248 #define bfd_elf32_bfd_link_hash_table_create \
2249 elf_m68k_link_hash_table_create
2250 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2251
2252 #define elf_backend_check_relocs elf_m68k_check_relocs
2253 #define elf_backend_adjust_dynamic_symbol \
2254 elf_m68k_adjust_dynamic_symbol
2255 #define elf_backend_size_dynamic_sections \
2256 elf_m68k_size_dynamic_sections
2257 #define elf_backend_relocate_section elf_m68k_relocate_section
2258 #define elf_backend_finish_dynamic_symbol \
2259 elf_m68k_finish_dynamic_symbol
2260 #define elf_backend_finish_dynamic_sections \
2261 elf_m68k_finish_dynamic_sections
2262 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2263 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2264 #define bfd_elf32_bfd_merge_private_bfd_data \
2265 elf32_m68k_merge_private_bfd_data
2266 #define bfd_elf32_bfd_set_private_flags \
2267 elf32_m68k_set_private_flags
2268 #define bfd_elf32_bfd_print_private_bfd_data \
2269 elf32_m68k_print_private_bfd_data
2270 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2271
2272 #define elf_backend_can_gc_sections 1
2273 #define elf_backend_can_refcount 1
2274 #define elf_backend_want_got_plt 1
2275 #define elf_backend_plt_readonly 1
2276 #define elf_backend_want_plt_sym 0
2277 #define elf_backend_got_header_size 12
2278 #define elf_backend_rela_normal 1
2279
2280 #include "elf32-target.h"
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