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* elf32-arm.c (elf32_arm_symbian_plt_entry): Fix comment typo.
[binutils.git] / bfd / elf32-m68k.c
blob44863f2d5a6a5407e6a7451871d67f5fe5a7ab05
1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 2004 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->forced_local)
510 {
511 if (!bfd_elf_link_record_dynamic_symbol (info, h))
512 return FALSE;
513 }
514
515 /* Allocate space in the .got section. */
516 sgot->size += 4;
517 /* Allocate relocation space. */
518 srelgot->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->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->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->needs_plt = 1;
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->forced_local)
588 {
589 if (!bfd_elf_link_record_dynamic_symbol (info, h))
590 return FALSE;
591 }
592
593 h->needs_plt = 1;
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->def_regular)))
616 {
617 if (h != NULL)
618 {
619 /* Make sure a plt entry is created for this symbol if
620 it turns out to be a function defined by a dynamic
621 object. */
622 h->plt.refcount++;
623 }
624 break;
625 }
626 /* Fall through. */
627 case R_68K_8:
628 case R_68K_16:
629 case R_68K_32:
630 if (h != NULL)
631 {
632 /* Make sure a plt entry is created for this symbol if it
633 turns out to be a function defined by a dynamic object. */
634 h->plt.refcount++;
635 }
636
637 /* If we are creating a shared library, we need to copy the
638 reloc into the shared library. */
639 if (info->shared
640 && (sec->flags & SEC_ALLOC) != 0)
641 {
642 /* When creating a shared object, we must copy these
643 reloc types into the output file. We create a reloc
644 section in dynobj and make room for this reloc. */
645 if (sreloc == NULL)
646 {
647 const char *name;
648
649 name = (bfd_elf_string_from_elf_section
650 (abfd,
651 elf_elfheader (abfd)->e_shstrndx,
652 elf_section_data (sec)->rel_hdr.sh_name));
653 if (name == NULL)
654 return FALSE;
655
656 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
657 && strcmp (bfd_get_section_name (abfd, sec),
658 name + 5) == 0);
659
660 sreloc = bfd_get_section_by_name (dynobj, name);
661 if (sreloc == NULL)
662 {
663 sreloc = bfd_make_section (dynobj, name);
664 if (sreloc == NULL
665 || !bfd_set_section_flags (dynobj, sreloc,
666 (SEC_ALLOC
667 | SEC_LOAD
668 | SEC_HAS_CONTENTS
669 | SEC_IN_MEMORY
670 | SEC_LINKER_CREATED
671 | SEC_READONLY))
672 || !bfd_set_section_alignment (dynobj, sreloc, 2))
673 return FALSE;
674 }
675 elf_section_data (sec)->sreloc = sreloc;
676 }
677
678 if (sec->flags & SEC_READONLY
679 /* Don't set DF_TEXTREL yet for PC relative
680 relocations, they might be discarded later. */
681 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8
682 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
683 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32))
684 info->flags |= DF_TEXTREL;
685
686 sreloc->size += sizeof (Elf32_External_Rela);
687
688 /* We count the number of PC relative relocations we have
689 entered for this symbol, so that we can discard them
690 again if, in the -Bsymbolic case, the symbol is later
691 defined by a regular object, or, in the normal shared
692 case, the symbol is forced to be local. Note that this
693 function is only called if we are using an m68kelf linker
694 hash table, which means that h is really a pointer to an
695 elf_m68k_link_hash_entry. */
696 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8
697 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
698 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
699 {
700 struct elf_m68k_pcrel_relocs_copied *p;
701 struct elf_m68k_pcrel_relocs_copied **head;
702
703 if (h != NULL)
704 {
705 struct elf_m68k_link_hash_entry *eh
706 = elf_m68k_hash_entry (h);
707 head = &eh->pcrel_relocs_copied;
708 }
709 else
710 {
711 asection *s;
712 s = (bfd_section_from_r_symndx
713 (abfd, &elf_m68k_hash_table (info)->sym_sec,
714 sec, r_symndx));
715 if (s == NULL)
716 return FALSE;
717
718 head = ((struct elf_m68k_pcrel_relocs_copied **)
719 &elf_section_data (s)->local_dynrel);
720 }
721
722 for (p = *head; p != NULL; p = p->next)
723 if (p->section == sreloc)
724 break;
725
726 if (p == NULL)
727 {
728 p = ((struct elf_m68k_pcrel_relocs_copied *)
729 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
730 if (p == NULL)
731 return FALSE;
732 p->next = *head;
733 *head = p;
734 p->section = sreloc;
735 p->count = 0;
736 }
737
738 ++p->count;
739 }
740 }
741
742 break;
743
744 /* This relocation describes the C++ object vtable hierarchy.
745 Reconstruct it for later use during GC. */
746 case R_68K_GNU_VTINHERIT:
747 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
748 return FALSE;
749 break;
750
751 /* This relocation describes which C++ vtable entries are actually
752 used. Record for later use during GC. */
753 case R_68K_GNU_VTENTRY:
754 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
755 return FALSE;
756 break;
757
758 default:
759 break;
760 }
761 }
762
763 return TRUE;
764 }
765
766 /* Return the section that should be marked against GC for a given
767 relocation. */
768
769 static asection *
770 elf_m68k_gc_mark_hook (sec, info, rel, h, sym)
771 asection *sec;
772 struct bfd_link_info *info ATTRIBUTE_UNUSED;
773 Elf_Internal_Rela *rel;
774 struct elf_link_hash_entry *h;
775 Elf_Internal_Sym *sym;
776 {
777 if (h != NULL)
778 {
779 switch (ELF32_R_TYPE (rel->r_info))
780 {
781 case R_68K_GNU_VTINHERIT:
782 case R_68K_GNU_VTENTRY:
783 break;
784
785 default:
786 switch (h->root.type)
787 {
788 default:
789 break;
790
791 case bfd_link_hash_defined:
792 case bfd_link_hash_defweak:
793 return h->root.u.def.section;
794
795 case bfd_link_hash_common:
796 return h->root.u.c.p->section;
797 }
798 }
799 }
800 else
801 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
802
803 return NULL;
804 }
805
806 /* Update the got entry reference counts for the section being removed. */
807
808 static bfd_boolean
809 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
810 bfd *abfd;
811 struct bfd_link_info *info;
812 asection *sec;
813 const Elf_Internal_Rela *relocs;
814 {
815 Elf_Internal_Shdr *symtab_hdr;
816 struct elf_link_hash_entry **sym_hashes;
817 bfd_signed_vma *local_got_refcounts;
818 const Elf_Internal_Rela *rel, *relend;
819 bfd *dynobj;
820 asection *sgot;
821 asection *srelgot;
822
823 dynobj = elf_hash_table (info)->dynobj;
824 if (dynobj == NULL)
825 return TRUE;
826
827 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
828 sym_hashes = elf_sym_hashes (abfd);
829 local_got_refcounts = elf_local_got_refcounts (abfd);
830
831 sgot = bfd_get_section_by_name (dynobj, ".got");
832 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
833
834 relend = relocs + sec->reloc_count;
835 for (rel = relocs; rel < relend; rel++)
836 {
837 unsigned long r_symndx;
838 struct elf_link_hash_entry *h;
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->size -= 4;
859 srelgot->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->size -= 4;
872 if (info->shared)
873 srelgot->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->needs_plt
928 || h->u.weakdef != NULL
929 || (h->def_dynamic
930 && h->ref_regular
931 && !h->def_regular)));
932
933 /* If this is a function, put it in the procedure linkage table. We
934 will fill in the contents of the procedure linkage table later,
935 when we know the address of the .got section. */
936 if (h->type == STT_FUNC
937 || h->needs_plt)
938 {
939 if ((h->plt.refcount <= 0
940 || SYMBOL_CALLS_LOCAL (info, h)
941 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
942 && h->root.type == bfd_link_hash_undefweak))
943 /* We must always create the plt entry if it was referenced
944 by a PLTxxO relocation. In this case we already recorded
945 it as a dynamic symbol. */
946 && h->dynindx == -1)
947 {
948 /* This case can occur if we saw a PLTxx reloc in an input
949 file, but the symbol was never referred to by a dynamic
950 object, or if all references were garbage collected. In
951 such a case, we don't actually need to build a procedure
952 linkage table, and we can just do a PCxx reloc instead. */
953 h->plt.offset = (bfd_vma) -1;
954 h->needs_plt = 0;
955 return TRUE;
956 }
957
958 /* Make sure this symbol is output as a dynamic symbol. */
959 if (h->dynindx == -1
960 && !h->forced_local)
961 {
962 if (! bfd_elf_link_record_dynamic_symbol (info, h))
963 return FALSE;
964 }
965
966 s = bfd_get_section_by_name (dynobj, ".plt");
967 BFD_ASSERT (s != NULL);
968
969 /* If this is the first .plt entry, make room for the special
970 first entry. */
971 if (s->size == 0)
972 {
973 if (CPU32_FLAG (dynobj))
974 s->size += PLT_CPU32_ENTRY_SIZE;
975 else
976 s->size += PLT_ENTRY_SIZE;
977 }
978
979 /* If this symbol is not defined in a regular file, and we are
980 not generating a shared library, then set the symbol to this
981 location in the .plt. This is required to make function
982 pointers compare as equal between the normal executable and
983 the shared library. */
984 if (!info->shared
985 && !h->def_regular)
986 {
987 h->root.u.def.section = s;
988 h->root.u.def.value = s->size;
989 }
990
991 h->plt.offset = s->size;
992
993 /* Make room for this entry. */
994 if (CPU32_FLAG (dynobj))
995 s->size += PLT_CPU32_ENTRY_SIZE;
996 else
997 s->size += PLT_ENTRY_SIZE;
998
999 /* We also need to make an entry in the .got.plt section, which
1000 will be placed in the .got section by the linker script. */
1001 s = bfd_get_section_by_name (dynobj, ".got.plt");
1002 BFD_ASSERT (s != NULL);
1003 s->size += 4;
1004
1005 /* We also need to make an entry in the .rela.plt section. */
1006 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1007 BFD_ASSERT (s != NULL);
1008 s->size += sizeof (Elf32_External_Rela);
1009
1010 return TRUE;
1011 }
1012
1013 /* Reinitialize the plt offset now that it is not used as a reference
1014 count any more. */
1015 h->plt.offset = (bfd_vma) -1;
1016
1017 /* If this is a weak symbol, and there is a real definition, the
1018 processor independent code will have arranged for us to see the
1019 real definition first, and we can just use the same value. */
1020 if (h->u.weakdef != NULL)
1021 {
1022 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1023 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1024 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1025 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1026 return TRUE;
1027 }
1028
1029 /* This is a reference to a symbol defined by a dynamic object which
1030 is not a function. */
1031
1032 /* If we are creating a shared library, we must presume that the
1033 only references to the symbol are via the global offset table.
1034 For such cases we need not do anything here; the relocations will
1035 be handled correctly by relocate_section. */
1036 if (info->shared)
1037 return TRUE;
1038
1039 /* We must allocate the symbol in our .dynbss section, which will
1040 become part of the .bss section of the executable. There will be
1041 an entry for this symbol in the .dynsym section. The dynamic
1042 object will contain position independent code, so all references
1043 from the dynamic object to this symbol will go through the global
1044 offset table. The dynamic linker will use the .dynsym entry to
1045 determine the address it must put in the global offset table, so
1046 both the dynamic object and the regular object will refer to the
1047 same memory location for the variable. */
1048
1049 s = bfd_get_section_by_name (dynobj, ".dynbss");
1050 BFD_ASSERT (s != NULL);
1051
1052 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1053 copy the initial value out of the dynamic object and into the
1054 runtime process image. We need to remember the offset into the
1055 .rela.bss section we are going to use. */
1056 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1057 {
1058 asection *srel;
1059
1060 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1061 BFD_ASSERT (srel != NULL);
1062 srel->size += sizeof (Elf32_External_Rela);
1063 h->needs_copy = 1;
1064 }
1065
1066 /* We need to figure out the alignment required for this symbol. I
1067 have no idea how ELF linkers handle this. */
1068 power_of_two = bfd_log2 (h->size);
1069 if (power_of_two > 3)
1070 power_of_two = 3;
1071
1072 /* Apply the required alignment. */
1073 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1074 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1075 {
1076 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1077 return FALSE;
1078 }
1079
1080 /* Define the symbol as being at this point in the section. */
1081 h->root.u.def.section = s;
1082 h->root.u.def.value = s->size;
1083
1084 /* Increment the section size to make room for the symbol. */
1085 s->size += h->size;
1086
1087 return TRUE;
1088 }
1089
1090 /* Set the sizes of the dynamic sections. */
1091
1092 static bfd_boolean
1093 elf_m68k_size_dynamic_sections (output_bfd, info)
1094 bfd *output_bfd ATTRIBUTE_UNUSED;
1095 struct bfd_link_info *info;
1096 {
1097 bfd *dynobj;
1098 asection *s;
1099 bfd_boolean plt;
1100 bfd_boolean relocs;
1101
1102 dynobj = elf_hash_table (info)->dynobj;
1103 BFD_ASSERT (dynobj != NULL);
1104
1105 if (elf_hash_table (info)->dynamic_sections_created)
1106 {
1107 /* Set the contents of the .interp section to the interpreter. */
1108 if (info->executable)
1109 {
1110 s = bfd_get_section_by_name (dynobj, ".interp");
1111 BFD_ASSERT (s != NULL);
1112 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1113 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1114 }
1115 }
1116 else
1117 {
1118 /* We may have created entries in the .rela.got section.
1119 However, if we are not creating the dynamic sections, we will
1120 not actually use these entries. Reset the size of .rela.got,
1121 which will cause it to get stripped from the output file
1122 below. */
1123 s = bfd_get_section_by_name (dynobj, ".rela.got");
1124 if (s != NULL)
1125 s->size = 0;
1126 }
1127
1128 /* If this is a -Bsymbolic shared link, then we need to discard all
1129 PC relative relocs against symbols defined in a regular object.
1130 For the normal shared case we discard the PC relative relocs
1131 against symbols that have become local due to visibility changes.
1132 We allocated space for them in the check_relocs routine, but we
1133 will not fill them in in the relocate_section routine. */
1134 if (info->shared)
1135 elf_link_hash_traverse (elf_hash_table (info),
1136 elf_m68k_discard_copies,
1137 (PTR) info);
1138
1139 /* The check_relocs and adjust_dynamic_symbol entry points have
1140 determined the sizes of the various dynamic sections. Allocate
1141 memory for them. */
1142 plt = FALSE;
1143 relocs = FALSE;
1144 for (s = dynobj->sections; s != NULL; s = s->next)
1145 {
1146 const char *name;
1147 bfd_boolean strip;
1148
1149 if ((s->flags & SEC_LINKER_CREATED) == 0)
1150 continue;
1151
1152 /* It's OK to base decisions on the section name, because none
1153 of the dynobj section names depend upon the input files. */
1154 name = bfd_get_section_name (dynobj, s);
1155
1156 strip = FALSE;
1157
1158 if (strcmp (name, ".plt") == 0)
1159 {
1160 if (s->size == 0)
1161 {
1162 /* Strip this section if we don't need it; see the
1163 comment below. */
1164 strip = TRUE;
1165 }
1166 else
1167 {
1168 /* Remember whether there is a PLT. */
1169 plt = TRUE;
1170 }
1171 }
1172 else if (strncmp (name, ".rela", 5) == 0)
1173 {
1174 if (s->size == 0)
1175 {
1176 /* If we don't need this section, strip it from the
1177 output file. This is mostly to handle .rela.bss and
1178 .rela.plt. We must create both sections in
1179 create_dynamic_sections, because they must be created
1180 before the linker maps input sections to output
1181 sections. The linker does that before
1182 adjust_dynamic_symbol is called, and it is that
1183 function which decides whether anything needs to go
1184 into these sections. */
1185 strip = TRUE;
1186 }
1187 else
1188 {
1189 relocs = TRUE;
1190
1191 /* We use the reloc_count field as a counter if we need
1192 to copy relocs into the output file. */
1193 s->reloc_count = 0;
1194 }
1195 }
1196 else if (strncmp (name, ".got", 4) != 0)
1197 {
1198 /* It's not one of our sections, so don't allocate space. */
1199 continue;
1200 }
1201
1202 if (strip)
1203 {
1204 _bfd_strip_section_from_output (info, s);
1205 continue;
1206 }
1207
1208 /* Allocate memory for the section contents. */
1209 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1210 Unused entries should be reclaimed before the section's contents
1211 are written out, but at the moment this does not happen. Thus in
1212 order to prevent writing out garbage, we initialise the section's
1213 contents to zero. */
1214 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1215 if (s->contents == NULL && s->size != 0)
1216 return FALSE;
1217 }
1218
1219 if (elf_hash_table (info)->dynamic_sections_created)
1220 {
1221 /* Add some entries to the .dynamic section. We fill in the
1222 values later, in elf_m68k_finish_dynamic_sections, but we
1223 must add the entries now so that we get the correct size for
1224 the .dynamic section. The DT_DEBUG entry is filled in by the
1225 dynamic linker and used by the debugger. */
1226 #define add_dynamic_entry(TAG, VAL) \
1227 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1228
1229 if (!info->shared)
1230 {
1231 if (!add_dynamic_entry (DT_DEBUG, 0))
1232 return FALSE;
1233 }
1234
1235 if (plt)
1236 {
1237 if (!add_dynamic_entry (DT_PLTGOT, 0)
1238 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1239 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1240 || !add_dynamic_entry (DT_JMPREL, 0))
1241 return FALSE;
1242 }
1243
1244 if (relocs)
1245 {
1246 if (!add_dynamic_entry (DT_RELA, 0)
1247 || !add_dynamic_entry (DT_RELASZ, 0)
1248 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1249 return FALSE;
1250 }
1251
1252 if ((info->flags & DF_TEXTREL) != 0)
1253 {
1254 if (!add_dynamic_entry (DT_TEXTREL, 0))
1255 return FALSE;
1256 }
1257 }
1258 #undef add_dynamic_entry
1259
1260 return TRUE;
1261 }
1262
1263 /* This function is called via elf_link_hash_traverse if we are
1264 creating a shared object. In the -Bsymbolic case it discards the
1265 space allocated to copy PC relative relocs against symbols which
1266 are defined in regular objects. For the normal shared case, it
1267 discards space for pc-relative relocs that have become local due to
1268 symbol visibility changes. We allocated space for them in the
1269 check_relocs routine, but we won't fill them in in the
1270 relocate_section routine.
1271
1272 We also check whether any of the remaining relocations apply
1273 against a readonly section, and set the DF_TEXTREL flag in this
1274 case. */
1275
1276 static bfd_boolean
1277 elf_m68k_discard_copies (h, inf)
1278 struct elf_link_hash_entry *h;
1279 PTR inf;
1280 {
1281 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1282 struct elf_m68k_pcrel_relocs_copied *s;
1283
1284 if (h->root.type == bfd_link_hash_warning)
1285 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1286
1287 if (!h->def_regular
1288 || (!info->symbolic
1289 && !h->forced_local))
1290 {
1291 if ((info->flags & DF_TEXTREL) == 0)
1292 {
1293 /* Look for relocations against read-only sections. */
1294 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1295 s != NULL;
1296 s = s->next)
1297 if ((s->section->flags & SEC_READONLY) != 0)
1298 {
1299 info->flags |= DF_TEXTREL;
1300 break;
1301 }
1302 }
1303
1304 return TRUE;
1305 }
1306
1307 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1308 s != NULL;
1309 s = s->next)
1310 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1311
1312 return TRUE;
1313 }
1314
1315 /* Relocate an M68K ELF section. */
1316
1317 static bfd_boolean
1318 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1319 contents, relocs, local_syms, local_sections)
1320 bfd *output_bfd;
1321 struct bfd_link_info *info;
1322 bfd *input_bfd;
1323 asection *input_section;
1324 bfd_byte *contents;
1325 Elf_Internal_Rela *relocs;
1326 Elf_Internal_Sym *local_syms;
1327 asection **local_sections;
1328 {
1329 bfd *dynobj;
1330 Elf_Internal_Shdr *symtab_hdr;
1331 struct elf_link_hash_entry **sym_hashes;
1332 bfd_vma *local_got_offsets;
1333 asection *sgot;
1334 asection *splt;
1335 asection *sreloc;
1336 Elf_Internal_Rela *rel;
1337 Elf_Internal_Rela *relend;
1338
1339 if (info->relocatable)
1340 return TRUE;
1341
1342 dynobj = elf_hash_table (info)->dynobj;
1343 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1344 sym_hashes = elf_sym_hashes (input_bfd);
1345 local_got_offsets = elf_local_got_offsets (input_bfd);
1346
1347 sgot = NULL;
1348 splt = NULL;
1349 sreloc = NULL;
1350
1351 rel = relocs;
1352 relend = relocs + input_section->reloc_count;
1353 for (; rel < relend; rel++)
1354 {
1355 int r_type;
1356 reloc_howto_type *howto;
1357 unsigned long r_symndx;
1358 struct elf_link_hash_entry *h;
1359 Elf_Internal_Sym *sym;
1360 asection *sec;
1361 bfd_vma relocation;
1362 bfd_boolean unresolved_reloc;
1363 bfd_reloc_status_type r;
1364
1365 r_type = ELF32_R_TYPE (rel->r_info);
1366 if (r_type < 0 || r_type >= (int) R_68K_max)
1367 {
1368 bfd_set_error (bfd_error_bad_value);
1369 return FALSE;
1370 }
1371 howto = howto_table + r_type;
1372
1373 r_symndx = ELF32_R_SYM (rel->r_info);
1374
1375 h = NULL;
1376 sym = NULL;
1377 sec = NULL;
1378 unresolved_reloc = FALSE;
1379
1380 if (r_symndx < symtab_hdr->sh_info)
1381 {
1382 sym = local_syms + r_symndx;
1383 sec = local_sections[r_symndx];
1384 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1385 }
1386 else
1387 {
1388 bfd_boolean warned;
1389
1390 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1391 r_symndx, symtab_hdr, sym_hashes,
1392 h, sec, relocation,
1393 unresolved_reloc, warned);
1394 }
1395
1396 switch (r_type)
1397 {
1398 case R_68K_GOT8:
1399 case R_68K_GOT16:
1400 case R_68K_GOT32:
1401 /* Relocation is to the address of the entry for this symbol
1402 in the global offset table. */
1403 if (h != NULL
1404 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1405 break;
1406 /* Fall through. */
1407 case R_68K_GOT8O:
1408 case R_68K_GOT16O:
1409 case R_68K_GOT32O:
1410 /* Relocation is the offset of the entry for this symbol in
1411 the global offset table. */
1412
1413 {
1414 bfd_vma off;
1415
1416 if (sgot == NULL)
1417 {
1418 sgot = bfd_get_section_by_name (dynobj, ".got");
1419 BFD_ASSERT (sgot != NULL);
1420 }
1421
1422 if (h != NULL)
1423 {
1424 bfd_boolean dyn;
1425
1426 off = h->got.offset;
1427 BFD_ASSERT (off != (bfd_vma) -1);
1428
1429 dyn = elf_hash_table (info)->dynamic_sections_created;
1430 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1431 || (info->shared
1432 && (info->symbolic
1433 || h->dynindx == -1
1434 || h->forced_local)
1435 && h->def_regular))
1436 {
1437 /* This is actually a static link, or it is a
1438 -Bsymbolic link and the symbol is defined
1439 locally, or the symbol was forced to be local
1440 because of a version file.. We must initialize
1441 this entry in the global offset table. Since
1442 the offset must always be a multiple of 4, we
1443 use the least significant bit to record whether
1444 we have initialized it already.
1445
1446 When doing a dynamic link, we create a .rela.got
1447 relocation entry to initialize the value. This
1448 is done in the finish_dynamic_symbol routine. */
1449 if ((off & 1) != 0)
1450 off &= ~1;
1451 else
1452 {
1453 bfd_put_32 (output_bfd, relocation,
1454 sgot->contents + off);
1455 h->got.offset |= 1;
1456 }
1457 }
1458 else
1459 unresolved_reloc = FALSE;
1460 }
1461 else
1462 {
1463 BFD_ASSERT (local_got_offsets != NULL
1464 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1465
1466 off = local_got_offsets[r_symndx];
1467
1468 /* The offset must always be a multiple of 4. We use
1469 the least significant bit to record whether we have
1470 already generated the necessary reloc. */
1471 if ((off & 1) != 0)
1472 off &= ~1;
1473 else
1474 {
1475 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1476
1477 if (info->shared)
1478 {
1479 asection *s;
1480 Elf_Internal_Rela outrel;
1481 bfd_byte *loc;
1482
1483 s = bfd_get_section_by_name (dynobj, ".rela.got");
1484 BFD_ASSERT (s != NULL);
1485
1486 outrel.r_offset = (sgot->output_section->vma
1487 + sgot->output_offset
1488 + off);
1489 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1490 outrel.r_addend = relocation;
1491 loc = s->contents;
1492 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1493 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1494 }
1495
1496 local_got_offsets[r_symndx] |= 1;
1497 }
1498 }
1499
1500 relocation = sgot->output_offset + off;
1501 if (r_type == R_68K_GOT8O
1502 || r_type == R_68K_GOT16O
1503 || r_type == R_68K_GOT32O)
1504 {
1505 /* This relocation does not use the addend. */
1506 rel->r_addend = 0;
1507 }
1508 else
1509 relocation += sgot->output_section->vma;
1510 }
1511 break;
1512
1513 case R_68K_PLT8:
1514 case R_68K_PLT16:
1515 case R_68K_PLT32:
1516 /* Relocation is to the entry for this symbol in the
1517 procedure linkage table. */
1518
1519 /* Resolve a PLTxx reloc against a local symbol directly,
1520 without using the procedure linkage table. */
1521 if (h == NULL)
1522 break;
1523
1524 if (h->plt.offset == (bfd_vma) -1
1525 || !elf_hash_table (info)->dynamic_sections_created)
1526 {
1527 /* We didn't make a PLT entry for this symbol. This
1528 happens when statically linking PIC code, or when
1529 using -Bsymbolic. */
1530 break;
1531 }
1532
1533 if (splt == NULL)
1534 {
1535 splt = bfd_get_section_by_name (dynobj, ".plt");
1536 BFD_ASSERT (splt != NULL);
1537 }
1538
1539 relocation = (splt->output_section->vma
1540 + splt->output_offset
1541 + h->plt.offset);
1542 unresolved_reloc = FALSE;
1543 break;
1544
1545 case R_68K_PLT8O:
1546 case R_68K_PLT16O:
1547 case R_68K_PLT32O:
1548 /* Relocation is the offset of the entry for this symbol in
1549 the procedure linkage table. */
1550 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1551
1552 if (splt == NULL)
1553 {
1554 splt = bfd_get_section_by_name (dynobj, ".plt");
1555 BFD_ASSERT (splt != NULL);
1556 }
1557
1558 relocation = h->plt.offset;
1559 unresolved_reloc = FALSE;
1560
1561 /* This relocation does not use the addend. */
1562 rel->r_addend = 0;
1563
1564 break;
1565
1566 case R_68K_PC8:
1567 case R_68K_PC16:
1568 case R_68K_PC32:
1569 if (h == NULL
1570 || (info->shared
1571 && h->forced_local))
1572 break;
1573 /* Fall through. */
1574 case R_68K_8:
1575 case R_68K_16:
1576 case R_68K_32:
1577 if (info->shared
1578 && r_symndx != 0
1579 && (input_section->flags & SEC_ALLOC) != 0
1580 && (h == NULL
1581 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1582 || h->root.type != bfd_link_hash_undefweak)
1583 && ((r_type != R_68K_PC8
1584 && r_type != R_68K_PC16
1585 && r_type != R_68K_PC32)
1586 || (h != NULL
1587 && h->dynindx != -1
1588 && (!info->symbolic
1589 || !h->def_regular))))
1590 {
1591 Elf_Internal_Rela outrel;
1592 bfd_byte *loc;
1593 bfd_boolean skip, relocate;
1594
1595 /* When generating a shared object, these relocations
1596 are copied into the output file to be resolved at run
1597 time. */
1598
1599 skip = FALSE;
1600 relocate = FALSE;
1601
1602 outrel.r_offset =
1603 _bfd_elf_section_offset (output_bfd, info, input_section,
1604 rel->r_offset);
1605 if (outrel.r_offset == (bfd_vma) -1)
1606 skip = TRUE;
1607 else if (outrel.r_offset == (bfd_vma) -2)
1608 skip = TRUE, relocate = TRUE;
1609 outrel.r_offset += (input_section->output_section->vma
1610 + input_section->output_offset);
1611
1612 if (skip)
1613 memset (&outrel, 0, sizeof outrel);
1614 else if (h != NULL
1615 && h->dynindx != -1
1616 && (r_type == R_68K_PC8
1617 || r_type == R_68K_PC16
1618 || r_type == R_68K_PC32
1619 || !info->shared
1620 || !info->symbolic
1621 || !h->def_regular))
1622 {
1623 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1624 outrel.r_addend = rel->r_addend;
1625 }
1626 else
1627 {
1628 /* This symbol is local, or marked to become local. */
1629 if (r_type == R_68K_32)
1630 {
1631 relocate = TRUE;
1632 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1633 outrel.r_addend = relocation + rel->r_addend;
1634 }
1635 else
1636 {
1637 long indx;
1638
1639 if (bfd_is_abs_section (sec))
1640 indx = 0;
1641 else if (sec == NULL || sec->owner == NULL)
1642 {
1643 bfd_set_error (bfd_error_bad_value);
1644 return FALSE;
1645 }
1646 else
1647 {
1648 asection *osec;
1649
1650 osec = sec->output_section;
1651 indx = elf_section_data (osec)->dynindx;
1652 BFD_ASSERT (indx > 0);
1653 }
1654
1655 outrel.r_info = ELF32_R_INFO (indx, r_type);
1656 outrel.r_addend = relocation + rel->r_addend;
1657 }
1658 }
1659
1660 sreloc = elf_section_data (input_section)->sreloc;
1661 if (sreloc == NULL)
1662 abort ();
1663
1664 loc = sreloc->contents;
1665 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1666 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1667
1668 /* This reloc will be computed at runtime, so there's no
1669 need to do anything now, except for R_68K_32
1670 relocations that have been turned into
1671 R_68K_RELATIVE. */
1672 if (!relocate)
1673 continue;
1674 }
1675
1676 break;
1677
1678 case R_68K_GNU_VTINHERIT:
1679 case R_68K_GNU_VTENTRY:
1680 /* These are no-ops in the end. */
1681 continue;
1682
1683 default:
1684 break;
1685 }
1686
1687 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1688 because such sections are not SEC_ALLOC and thus ld.so will
1689 not process them. */
1690 if (unresolved_reloc
1691 && !((input_section->flags & SEC_DEBUGGING) != 0
1692 && h->def_dynamic))
1693 {
1694 (*_bfd_error_handler)
1695 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
1696 input_bfd,
1697 input_section,
1698 (long) rel->r_offset,
1699 h->root.root.string);
1700 return FALSE;
1701 }
1702
1703 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1704 contents, rel->r_offset,
1705 relocation, rel->r_addend);
1706
1707 if (r != bfd_reloc_ok)
1708 {
1709 const char *name;
1710
1711 if (h != NULL)
1712 name = h->root.root.string;
1713 else
1714 {
1715 name = bfd_elf_string_from_elf_section (input_bfd,
1716 symtab_hdr->sh_link,
1717 sym->st_name);
1718 if (name == NULL)
1719 return FALSE;
1720 if (*name == '\0')
1721 name = bfd_section_name (input_bfd, sec);
1722 }
1723
1724 if (r == bfd_reloc_overflow)
1725 {
1726 if (!(info->callbacks->reloc_overflow
1727 (info, (h ? &h->root : NULL), name, howto->name,
1728 (bfd_vma) 0, input_bfd, input_section,
1729 rel->r_offset)))
1730 return FALSE;
1731 }
1732 else
1733 {
1734 (*_bfd_error_handler)
1735 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
1736 input_bfd, input_section,
1737 (long) rel->r_offset, name, (int) r);
1738 return FALSE;
1739 }
1740 }
1741 }
1742
1743 return TRUE;
1744 }
1745
1746 /* Finish up dynamic symbol handling. We set the contents of various
1747 dynamic sections here. */
1748
1749 static bfd_boolean
1750 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1751 bfd *output_bfd;
1752 struct bfd_link_info *info;
1753 struct elf_link_hash_entry *h;
1754 Elf_Internal_Sym *sym;
1755 {
1756 bfd *dynobj;
1757 int plt_off1, plt_off2, plt_off3;
1758
1759 dynobj = elf_hash_table (info)->dynobj;
1760
1761 if (h->plt.offset != (bfd_vma) -1)
1762 {
1763 asection *splt;
1764 asection *sgot;
1765 asection *srela;
1766 bfd_vma plt_index;
1767 bfd_vma got_offset;
1768 Elf_Internal_Rela rela;
1769 bfd_byte *loc;
1770
1771 /* This symbol has an entry in the procedure linkage table. Set
1772 it up. */
1773
1774 BFD_ASSERT (h->dynindx != -1);
1775
1776 splt = bfd_get_section_by_name (dynobj, ".plt");
1777 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1778 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1779 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1780
1781 /* Get the index in the procedure linkage table which
1782 corresponds to this symbol. This is the index of this symbol
1783 in all the symbols for which we are making plt entries. The
1784 first entry in the procedure linkage table is reserved. */
1785 if ( CPU32_FLAG (output_bfd))
1786 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1787 else
1788 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1789
1790 /* Get the offset into the .got table of the entry that
1791 corresponds to this function. Each .got entry is 4 bytes.
1792 The first three are reserved. */
1793 got_offset = (plt_index + 3) * 4;
1794
1795 if ( CPU32_FLAG (output_bfd))
1796 {
1797 /* Fill in the entry in the procedure linkage table. */
1798 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1799 PLT_CPU32_ENTRY_SIZE);
1800 plt_off1 = 4;
1801 plt_off2 = 12;
1802 plt_off3 = 18;
1803 }
1804 else
1805 {
1806 /* Fill in the entry in the procedure linkage table. */
1807 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1808 PLT_ENTRY_SIZE);
1809 plt_off1 = 4;
1810 plt_off2 = 10;
1811 plt_off3 = 16;
1812 }
1813
1814 /* The offset is relative to the first extension word. */
1815 bfd_put_32 (output_bfd,
1816 (sgot->output_section->vma
1817 + sgot->output_offset
1818 + got_offset
1819 - (splt->output_section->vma
1820 + h->plt.offset + 2)),
1821 splt->contents + h->plt.offset + plt_off1);
1822
1823 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1824 splt->contents + h->plt.offset + plt_off2);
1825 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1826 splt->contents + h->plt.offset + plt_off3);
1827
1828 /* Fill in the entry in the global offset table. */
1829 bfd_put_32 (output_bfd,
1830 (splt->output_section->vma
1831 + splt->output_offset
1832 + h->plt.offset
1833 + 8),
1834 sgot->contents + got_offset);
1835
1836 /* Fill in the entry in the .rela.plt section. */
1837 rela.r_offset = (sgot->output_section->vma
1838 + sgot->output_offset
1839 + got_offset);
1840 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1841 rela.r_addend = 0;
1842 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1843 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1844
1845 if (!h->def_regular)
1846 {
1847 /* Mark the symbol as undefined, rather than as defined in
1848 the .plt section. Leave the value alone. */
1849 sym->st_shndx = SHN_UNDEF;
1850 }
1851 }
1852
1853 if (h->got.offset != (bfd_vma) -1)
1854 {
1855 asection *sgot;
1856 asection *srela;
1857 Elf_Internal_Rela rela;
1858 bfd_byte *loc;
1859
1860 /* This symbol has an entry in the global offset table. Set it
1861 up. */
1862
1863 sgot = bfd_get_section_by_name (dynobj, ".got");
1864 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1865 BFD_ASSERT (sgot != NULL && srela != NULL);
1866
1867 rela.r_offset = (sgot->output_section->vma
1868 + sgot->output_offset
1869 + (h->got.offset &~ (bfd_vma) 1));
1870
1871 /* If this is a -Bsymbolic link, and the symbol is defined
1872 locally, we just want to emit a RELATIVE reloc. Likewise if
1873 the symbol was forced to be local because of a version file.
1874 The entry in the global offset table will already have been
1875 initialized in the relocate_section function. */
1876 if (info->shared
1877 && (info->symbolic
1878 || h->dynindx == -1
1879 || h->forced_local)
1880 && h->def_regular)
1881 {
1882 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1883 rela.r_addend = bfd_get_signed_32 (output_bfd,
1884 (sgot->contents
1885 + (h->got.offset &~ (bfd_vma) 1)));
1886 }
1887 else
1888 {
1889 bfd_put_32 (output_bfd, (bfd_vma) 0,
1890 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1891 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1892 rela.r_addend = 0;
1893 }
1894
1895 loc = srela->contents;
1896 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1897 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1898 }
1899
1900 if (h->needs_copy)
1901 {
1902 asection *s;
1903 Elf_Internal_Rela rela;
1904 bfd_byte *loc;
1905
1906 /* This symbol needs a copy reloc. Set it up. */
1907
1908 BFD_ASSERT (h->dynindx != -1
1909 && (h->root.type == bfd_link_hash_defined
1910 || h->root.type == bfd_link_hash_defweak));
1911
1912 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1913 ".rela.bss");
1914 BFD_ASSERT (s != NULL);
1915
1916 rela.r_offset = (h->root.u.def.value
1917 + h->root.u.def.section->output_section->vma
1918 + h->root.u.def.section->output_offset);
1919 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1920 rela.r_addend = 0;
1921 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1922 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1923 }
1924
1925 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1926 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1927 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1928 sym->st_shndx = SHN_ABS;
1929
1930 return TRUE;
1931 }
1932
1933 /* Finish up the dynamic sections. */
1934
1935 static bfd_boolean
1936 elf_m68k_finish_dynamic_sections (output_bfd, info)
1937 bfd *output_bfd;
1938 struct bfd_link_info *info;
1939 {
1940 bfd *dynobj;
1941 asection *sgot;
1942 asection *sdyn;
1943
1944 dynobj = elf_hash_table (info)->dynobj;
1945
1946 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1947 BFD_ASSERT (sgot != NULL);
1948 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1949
1950 if (elf_hash_table (info)->dynamic_sections_created)
1951 {
1952 asection *splt;
1953 Elf32_External_Dyn *dyncon, *dynconend;
1954
1955 splt = bfd_get_section_by_name (dynobj, ".plt");
1956 BFD_ASSERT (splt != NULL && sdyn != NULL);
1957
1958 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1959 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
1960 for (; dyncon < dynconend; dyncon++)
1961 {
1962 Elf_Internal_Dyn dyn;
1963 const char *name;
1964 asection *s;
1965
1966 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1967
1968 switch (dyn.d_tag)
1969 {
1970 default:
1971 break;
1972
1973 case DT_PLTGOT:
1974 name = ".got";
1975 goto get_vma;
1976 case DT_JMPREL:
1977 name = ".rela.plt";
1978 get_vma:
1979 s = bfd_get_section_by_name (output_bfd, name);
1980 BFD_ASSERT (s != NULL);
1981 dyn.d_un.d_ptr = s->vma;
1982 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1983 break;
1984
1985 case DT_PLTRELSZ:
1986 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1987 BFD_ASSERT (s != NULL);
1988 dyn.d_un.d_val = s->size;
1989 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1990 break;
1991
1992 case DT_RELASZ:
1993 /* The procedure linkage table relocs (DT_JMPREL) should
1994 not be included in the overall relocs (DT_RELA).
1995 Therefore, we override the DT_RELASZ entry here to
1996 make it not include the JMPREL relocs. Since the
1997 linker script arranges for .rela.plt to follow all
1998 other relocation sections, we don't have to worry
1999 about changing the DT_RELA entry. */
2000 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2001 if (s != NULL)
2002 dyn.d_un.d_val -= s->size;
2003 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2004 break;
2005 }
2006 }
2007
2008 /* Fill in the first entry in the procedure linkage table. */
2009 if (splt->size > 0)
2010 {
2011 if (!CPU32_FLAG (output_bfd))
2012 {
2013 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2014 bfd_put_32 (output_bfd,
2015 (sgot->output_section->vma
2016 + sgot->output_offset + 4
2017 - (splt->output_section->vma + 2)),
2018 splt->contents + 4);
2019 bfd_put_32 (output_bfd,
2020 (sgot->output_section->vma
2021 + sgot->output_offset + 8
2022 - (splt->output_section->vma + 10)),
2023 splt->contents + 12);
2024 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2025 = PLT_ENTRY_SIZE;
2026 }
2027 else /* cpu32 */
2028 {
2029 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2030 bfd_put_32 (output_bfd,
2031 (sgot->output_section->vma
2032 + sgot->output_offset + 4
2033 - (splt->output_section->vma + 2)),
2034 splt->contents + 4);
2035 bfd_put_32 (output_bfd,
2036 (sgot->output_section->vma
2037 + sgot->output_offset + 8
2038 - (splt->output_section->vma + 10)),
2039 splt->contents + 12);
2040 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2041 = PLT_CPU32_ENTRY_SIZE;
2042 }
2043 }
2044 }
2045
2046 /* Fill in the first three entries in the global offset table. */
2047 if (sgot->size > 0)
2048 {
2049 if (sdyn == NULL)
2050 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2051 else
2052 bfd_put_32 (output_bfd,
2053 sdyn->output_section->vma + sdyn->output_offset,
2054 sgot->contents);
2055 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2056 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2057 }
2058
2059 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2060
2061 return TRUE;
2062 }
2063
2064 /* Given a .data section and a .emreloc in-memory section, store
2065 relocation information into the .emreloc section which can be
2066 used at runtime to relocate the section. This is called by the
2067 linker when the --embedded-relocs switch is used. This is called
2068 after the add_symbols entry point has been called for all the
2069 objects, and before the final_link entry point is called. */
2070
2071 bfd_boolean
2072 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2073 bfd *abfd;
2074 struct bfd_link_info *info;
2075 asection *datasec;
2076 asection *relsec;
2077 char **errmsg;
2078 {
2079 Elf_Internal_Shdr *symtab_hdr;
2080 Elf_Internal_Sym *isymbuf = NULL;
2081 Elf_Internal_Rela *internal_relocs = NULL;
2082 Elf_Internal_Rela *irel, *irelend;
2083 bfd_byte *p;
2084 bfd_size_type amt;
2085
2086 BFD_ASSERT (! info->relocatable);
2087
2088 *errmsg = NULL;
2089
2090 if (datasec->reloc_count == 0)
2091 return TRUE;
2092
2093 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2094
2095 /* Get a copy of the native relocations. */
2096 internal_relocs = (_bfd_elf_link_read_relocs
2097 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2098 info->keep_memory));
2099 if (internal_relocs == NULL)
2100 goto error_return;
2101
2102 amt = (bfd_size_type) datasec->reloc_count * 12;
2103 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2104 if (relsec->contents == NULL)
2105 goto error_return;
2106
2107 p = relsec->contents;
2108
2109 irelend = internal_relocs + datasec->reloc_count;
2110 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2111 {
2112 asection *targetsec;
2113
2114 /* We are going to write a four byte longword into the runtime
2115 reloc section. The longword will be the address in the data
2116 section which must be relocated. It is followed by the name
2117 of the target section NUL-padded or truncated to 8
2118 characters. */
2119
2120 /* We can only relocate absolute longword relocs at run time. */
2121 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2122 {
2123 *errmsg = _("unsupported reloc type");
2124 bfd_set_error (bfd_error_bad_value);
2125 goto error_return;
2126 }
2127
2128 /* Get the target section referred to by the reloc. */
2129 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2130 {
2131 /* A local symbol. */
2132 Elf_Internal_Sym *isym;
2133
2134 /* Read this BFD's local symbols if we haven't done so already. */
2135 if (isymbuf == NULL)
2136 {
2137 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2138 if (isymbuf == NULL)
2139 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2140 symtab_hdr->sh_info, 0,
2141 NULL, NULL, NULL);
2142 if (isymbuf == NULL)
2143 goto error_return;
2144 }
2145
2146 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2147 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2148 }
2149 else
2150 {
2151 unsigned long indx;
2152 struct elf_link_hash_entry *h;
2153
2154 /* An external symbol. */
2155 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2156 h = elf_sym_hashes (abfd)[indx];
2157 BFD_ASSERT (h != NULL);
2158 if (h->root.type == bfd_link_hash_defined
2159 || h->root.type == bfd_link_hash_defweak)
2160 targetsec = h->root.u.def.section;
2161 else
2162 targetsec = NULL;
2163 }
2164
2165 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2166 memset (p + 4, 0, 8);
2167 if (targetsec != NULL)
2168 strncpy (p + 4, targetsec->output_section->name, 8);
2169 }
2170
2171 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2172 free (isymbuf);
2173 if (internal_relocs != NULL
2174 && elf_section_data (datasec)->relocs != internal_relocs)
2175 free (internal_relocs);
2176 return TRUE;
2177
2178 error_return:
2179 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2180 free (isymbuf);
2181 if (internal_relocs != NULL
2182 && elf_section_data (datasec)->relocs != internal_relocs)
2183 free (internal_relocs);
2184 return FALSE;
2185 }
2186
2187 static enum elf_reloc_type_class
2188 elf32_m68k_reloc_type_class (rela)
2189 const Elf_Internal_Rela *rela;
2190 {
2191 switch ((int) ELF32_R_TYPE (rela->r_info))
2192 {
2193 case R_68K_RELATIVE:
2194 return reloc_class_relative;
2195 case R_68K_JMP_SLOT:
2196 return reloc_class_plt;
2197 case R_68K_COPY:
2198 return reloc_class_copy;
2199 default:
2200 return reloc_class_normal;
2201 }
2202 }
2203
2204 /* Return address for Ith PLT stub in section PLT, for relocation REL
2205 or (bfd_vma) -1 if it should not be included. */
2206
2207 static bfd_vma
2208 elf_m68k_plt_sym_val (bfd_vma i, const asection *plt,
2209 const arelent *rel ATTRIBUTE_UNUSED)
2210 {
2211 if (CPU32_FLAG (plt->owner))
2212 return plt->vma + (i + 1) * PLT_CPU32_ENTRY_SIZE;
2213 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
2214 }
2215
2216 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2217 #define TARGET_BIG_NAME "elf32-m68k"
2218 #define ELF_MACHINE_CODE EM_68K
2219 #define ELF_MAXPAGESIZE 0x2000
2220 #define elf_backend_create_dynamic_sections \
2221 _bfd_elf_create_dynamic_sections
2222 #define bfd_elf32_bfd_link_hash_table_create \
2223 elf_m68k_link_hash_table_create
2224 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
2225
2226 #define elf_backend_check_relocs elf_m68k_check_relocs
2227 #define elf_backend_adjust_dynamic_symbol \
2228 elf_m68k_adjust_dynamic_symbol
2229 #define elf_backend_size_dynamic_sections \
2230 elf_m68k_size_dynamic_sections
2231 #define elf_backend_relocate_section elf_m68k_relocate_section
2232 #define elf_backend_finish_dynamic_symbol \
2233 elf_m68k_finish_dynamic_symbol
2234 #define elf_backend_finish_dynamic_sections \
2235 elf_m68k_finish_dynamic_sections
2236 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2237 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2238 #define bfd_elf32_bfd_merge_private_bfd_data \
2239 elf32_m68k_merge_private_bfd_data
2240 #define bfd_elf32_bfd_set_private_flags \
2241 elf32_m68k_set_private_flags
2242 #define bfd_elf32_bfd_print_private_bfd_data \
2243 elf32_m68k_print_private_bfd_data
2244 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2245 #define elf_backend_plt_sym_val elf_m68k_plt_sym_val
2246
2247 #define elf_backend_can_gc_sections 1
2248 #define elf_backend_can_refcount 1
2249 #define elf_backend_want_got_plt 1
2250 #define elf_backend_plt_readonly 1
2251 #define elf_backend_want_plt_sym 0
2252 #define elf_backend_got_header_size 12
2253 #define elf_backend_rela_normal 1
2254
2255 #include "elf32-target.h"
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