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[binutils.git] / bfd / elf32-m68k.c
blob08cc79347612dba192fa338c6f5d5484100b5f28
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->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
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->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_elf_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->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_elf_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_elf_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 bfd *dynobj;
821 asection *sgot;
822 asection *srelgot;
823
824 dynobj = elf_hash_table (info)->dynobj;
825 if (dynobj == NULL)
826 return TRUE;
827
828 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
829 sym_hashes = elf_sym_hashes (abfd);
830 local_got_refcounts = elf_local_got_refcounts (abfd);
831
832 sgot = bfd_get_section_by_name (dynobj, ".got");
833 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
834
835 relend = relocs + sec->reloc_count;
836 for (rel = relocs; rel < relend; rel++)
837 {
838 unsigned long r_symndx;
839 struct elf_link_hash_entry *h;
840
841 switch (ELF32_R_TYPE (rel->r_info))
842 {
843 case R_68K_GOT8:
844 case R_68K_GOT16:
845 case R_68K_GOT32:
846 case R_68K_GOT8O:
847 case R_68K_GOT16O:
848 case R_68K_GOT32O:
849 r_symndx = ELF32_R_SYM (rel->r_info);
850 if (r_symndx >= symtab_hdr->sh_info)
851 {
852 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
853 if (h->got.refcount > 0)
854 {
855 --h->got.refcount;
856 if (h->got.refcount == 0)
857 {
858 /* We don't need the .got entry any more. */
859 sgot->size -= 4;
860 srelgot->size -= sizeof (Elf32_External_Rela);
861 }
862 }
863 }
864 else if (local_got_refcounts != NULL)
865 {
866 if (local_got_refcounts[r_symndx] > 0)
867 {
868 --local_got_refcounts[r_symndx];
869 if (local_got_refcounts[r_symndx] == 0)
870 {
871 /* We don't need the .got entry any more. */
872 sgot->size -= 4;
873 if (info->shared)
874 srelgot->size -= sizeof (Elf32_External_Rela);
875 }
876 }
877 }
878 break;
879
880 case R_68K_PLT8:
881 case R_68K_PLT16:
882 case R_68K_PLT32:
883 case R_68K_PLT8O:
884 case R_68K_PLT16O:
885 case R_68K_PLT32O:
886 case R_68K_PC8:
887 case R_68K_PC16:
888 case R_68K_PC32:
889 case R_68K_8:
890 case R_68K_16:
891 case R_68K_32:
892 r_symndx = ELF32_R_SYM (rel->r_info);
893 if (r_symndx >= symtab_hdr->sh_info)
894 {
895 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
896 if (h->plt.refcount > 0)
897 --h->plt.refcount;
898 }
899 break;
900
901 default:
902 break;
903 }
904 }
905
906 return TRUE;
907 }
908
909 /* Adjust a symbol defined by a dynamic object and referenced by a
910 regular object. The current definition is in some section of the
911 dynamic object, but we're not including those sections. We have to
912 change the definition to something the rest of the link can
913 understand. */
914
915 static bfd_boolean
916 elf_m68k_adjust_dynamic_symbol (info, h)
917 struct bfd_link_info *info;
918 struct elf_link_hash_entry *h;
919 {
920 bfd *dynobj;
921 asection *s;
922 unsigned int power_of_two;
923
924 dynobj = elf_hash_table (info)->dynobj;
925
926 /* Make sure we know what is going on here. */
927 BFD_ASSERT (dynobj != NULL
928 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
929 || h->weakdef != NULL
930 || ((h->elf_link_hash_flags
931 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
932 && (h->elf_link_hash_flags
933 & ELF_LINK_HASH_REF_REGULAR) != 0
934 && (h->elf_link_hash_flags
935 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
936
937 /* If this is a function, put it in the procedure linkage table. We
938 will fill in the contents of the procedure linkage table later,
939 when we know the address of the .got section. */
940 if (h->type == STT_FUNC
941 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
942 {
943 if (! info->shared
944 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
945 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
946 /* We must always create the plt entry if it was referenced
947 by a PLTxxO relocation. In this case we already recorded
948 it as a dynamic symbol. */
949 && h->dynindx == -1)
950 {
951 /* This case can occur if we saw a PLTxx reloc in an input
952 file, but the symbol was never referred to by a dynamic
953 object. In such a case, we don't actually need to build
954 a procedure linkage table, and we can just do a PCxx
955 reloc instead. */
956 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
957 h->plt.offset = (bfd_vma) -1;
958 return TRUE;
959 }
960
961 /* GC may have rendered this entry unused. */
962 if (h->plt.refcount <= 0)
963 {
964 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
965 h->plt.offset = (bfd_vma) -1;
966 return TRUE;
967 }
968
969 /* Make sure this symbol is output as a dynamic symbol. */
970 if (h->dynindx == -1
971 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
972 {
973 if (! bfd_elf_link_record_dynamic_symbol (info, h))
974 return FALSE;
975 }
976
977 s = bfd_get_section_by_name (dynobj, ".plt");
978 BFD_ASSERT (s != NULL);
979
980 /* If this is the first .plt entry, make room for the special
981 first entry. */
982 if (s->size == 0)
983 {
984 if (CPU32_FLAG (dynobj))
985 s->size += PLT_CPU32_ENTRY_SIZE;
986 else
987 s->size += PLT_ENTRY_SIZE;
988 }
989
990 /* If this symbol is not defined in a regular file, and we are
991 not generating a shared library, then set the symbol to this
992 location in the .plt. This is required to make function
993 pointers compare as equal between the normal executable and
994 the shared library. */
995 if (!info->shared
996 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
997 {
998 h->root.u.def.section = s;
999 h->root.u.def.value = s->size;
1000 }
1001
1002 h->plt.offset = s->size;
1003
1004 /* Make room for this entry. */
1005 if (CPU32_FLAG (dynobj))
1006 s->size += PLT_CPU32_ENTRY_SIZE;
1007 else
1008 s->size += PLT_ENTRY_SIZE;
1009
1010 /* We also need to make an entry in the .got.plt section, which
1011 will be placed in the .got section by the linker script. */
1012 s = bfd_get_section_by_name (dynobj, ".got.plt");
1013 BFD_ASSERT (s != NULL);
1014 s->size += 4;
1015
1016 /* We also need to make an entry in the .rela.plt section. */
1017 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1018 BFD_ASSERT (s != NULL);
1019 s->size += sizeof (Elf32_External_Rela);
1020
1021 return TRUE;
1022 }
1023
1024 /* Reinitialize the plt offset now that it is not used as a reference
1025 count any more. */
1026 h->plt.offset = (bfd_vma) -1;
1027
1028 /* If this is a weak symbol, and there is a real definition, the
1029 processor independent code will have arranged for us to see the
1030 real definition first, and we can just use the same value. */
1031 if (h->weakdef != NULL)
1032 {
1033 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1034 || h->weakdef->root.type == bfd_link_hash_defweak);
1035 h->root.u.def.section = h->weakdef->root.u.def.section;
1036 h->root.u.def.value = h->weakdef->root.u.def.value;
1037 return TRUE;
1038 }
1039
1040 /* This is a reference to a symbol defined by a dynamic object which
1041 is not a function. */
1042
1043 /* If we are creating a shared library, we must presume that the
1044 only references to the symbol are via the global offset table.
1045 For such cases we need not do anything here; the relocations will
1046 be handled correctly by relocate_section. */
1047 if (info->shared)
1048 return TRUE;
1049
1050 /* We must allocate the symbol in our .dynbss section, which will
1051 become part of the .bss section of the executable. There will be
1052 an entry for this symbol in the .dynsym section. The dynamic
1053 object will contain position independent code, so all references
1054 from the dynamic object to this symbol will go through the global
1055 offset table. The dynamic linker will use the .dynsym entry to
1056 determine the address it must put in the global offset table, so
1057 both the dynamic object and the regular object will refer to the
1058 same memory location for the variable. */
1059
1060 s = bfd_get_section_by_name (dynobj, ".dynbss");
1061 BFD_ASSERT (s != NULL);
1062
1063 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1064 copy the initial value out of the dynamic object and into the
1065 runtime process image. We need to remember the offset into the
1066 .rela.bss section we are going to use. */
1067 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1068 {
1069 asection *srel;
1070
1071 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1072 BFD_ASSERT (srel != NULL);
1073 srel->size += sizeof (Elf32_External_Rela);
1074 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1075 }
1076
1077 /* We need to figure out the alignment required for this symbol. I
1078 have no idea how ELF linkers handle this. */
1079 power_of_two = bfd_log2 (h->size);
1080 if (power_of_two > 3)
1081 power_of_two = 3;
1082
1083 /* Apply the required alignment. */
1084 s->size = BFD_ALIGN (s->size, (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->size;
1094
1095 /* Increment the section size to make room for the symbol. */
1096 s->size += h->size;
1097
1098 return TRUE;
1099 }
1100
1101 /* Set the sizes of the dynamic sections. */
1102
1103 static bfd_boolean
1104 elf_m68k_size_dynamic_sections (output_bfd, info)
1105 bfd *output_bfd ATTRIBUTE_UNUSED;
1106 struct bfd_link_info *info;
1107 {
1108 bfd *dynobj;
1109 asection *s;
1110 bfd_boolean plt;
1111 bfd_boolean relocs;
1112
1113 dynobj = elf_hash_table (info)->dynobj;
1114 BFD_ASSERT (dynobj != NULL);
1115
1116 if (elf_hash_table (info)->dynamic_sections_created)
1117 {
1118 /* Set the contents of the .interp section to the interpreter. */
1119 if (info->executable)
1120 {
1121 s = bfd_get_section_by_name (dynobj, ".interp");
1122 BFD_ASSERT (s != NULL);
1123 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1124 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1125 }
1126 }
1127 else
1128 {
1129 /* We may have created entries in the .rela.got section.
1130 However, if we are not creating the dynamic sections, we will
1131 not actually use these entries. Reset the size of .rela.got,
1132 which will cause it to get stripped from the output file
1133 below. */
1134 s = bfd_get_section_by_name (dynobj, ".rela.got");
1135 if (s != NULL)
1136 s->size = 0;
1137 }
1138
1139 /* If this is a -Bsymbolic shared link, then we need to discard all
1140 PC relative relocs against symbols defined in a regular object.
1141 For the normal shared case we discard the PC relative relocs
1142 against symbols that have become local due to visibility changes.
1143 We allocated space for them in the check_relocs routine, but we
1144 will not fill them in in the relocate_section routine. */
1145 if (info->shared)
1146 elf_link_hash_traverse (elf_hash_table (info),
1147 elf_m68k_discard_copies,
1148 (PTR) info);
1149
1150 /* The check_relocs and adjust_dynamic_symbol entry points have
1151 determined the sizes of the various dynamic sections. Allocate
1152 memory for them. */
1153 plt = FALSE;
1154 relocs = FALSE;
1155 for (s = dynobj->sections; s != NULL; s = s->next)
1156 {
1157 const char *name;
1158 bfd_boolean strip;
1159
1160 if ((s->flags & SEC_LINKER_CREATED) == 0)
1161 continue;
1162
1163 /* It's OK to base decisions on the section name, because none
1164 of the dynobj section names depend upon the input files. */
1165 name = bfd_get_section_name (dynobj, s);
1166
1167 strip = FALSE;
1168
1169 if (strcmp (name, ".plt") == 0)
1170 {
1171 if (s->size == 0)
1172 {
1173 /* Strip this section if we don't need it; see the
1174 comment below. */
1175 strip = TRUE;
1176 }
1177 else
1178 {
1179 /* Remember whether there is a PLT. */
1180 plt = TRUE;
1181 }
1182 }
1183 else if (strncmp (name, ".rela", 5) == 0)
1184 {
1185 if (s->size == 0)
1186 {
1187 /* If we don't need this section, strip it from the
1188 output file. This is mostly to handle .rela.bss and
1189 .rela.plt. We must create both sections in
1190 create_dynamic_sections, because they must be created
1191 before the linker maps input sections to output
1192 sections. The linker does that before
1193 adjust_dynamic_symbol is called, and it is that
1194 function which decides whether anything needs to go
1195 into these sections. */
1196 strip = TRUE;
1197 }
1198 else
1199 {
1200 relocs = TRUE;
1201
1202 /* We use the reloc_count field as a counter if we need
1203 to copy relocs into the output file. */
1204 s->reloc_count = 0;
1205 }
1206 }
1207 else if (strncmp (name, ".got", 4) != 0)
1208 {
1209 /* It's not one of our sections, so don't allocate space. */
1210 continue;
1211 }
1212
1213 if (strip)
1214 {
1215 _bfd_strip_section_from_output (info, s);
1216 continue;
1217 }
1218
1219 /* Allocate memory for the section contents. */
1220 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1221 Unused entries should be reclaimed before the section's contents
1222 are written out, but at the moment this does not happen. Thus in
1223 order to prevent writing out garbage, we initialise the section's
1224 contents to zero. */
1225 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1226 if (s->contents == NULL && s->size != 0)
1227 return FALSE;
1228 }
1229
1230 if (elf_hash_table (info)->dynamic_sections_created)
1231 {
1232 /* Add some entries to the .dynamic section. We fill in the
1233 values later, in elf_m68k_finish_dynamic_sections, but we
1234 must add the entries now so that we get the correct size for
1235 the .dynamic section. The DT_DEBUG entry is filled in by the
1236 dynamic linker and used by the debugger. */
1237 #define add_dynamic_entry(TAG, VAL) \
1238 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1239
1240 if (!info->shared)
1241 {
1242 if (!add_dynamic_entry (DT_DEBUG, 0))
1243 return FALSE;
1244 }
1245
1246 if (plt)
1247 {
1248 if (!add_dynamic_entry (DT_PLTGOT, 0)
1249 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1250 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1251 || !add_dynamic_entry (DT_JMPREL, 0))
1252 return FALSE;
1253 }
1254
1255 if (relocs)
1256 {
1257 if (!add_dynamic_entry (DT_RELA, 0)
1258 || !add_dynamic_entry (DT_RELASZ, 0)
1259 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1260 return FALSE;
1261 }
1262
1263 if ((info->flags & DF_TEXTREL) != 0)
1264 {
1265 if (!add_dynamic_entry (DT_TEXTREL, 0))
1266 return FALSE;
1267 }
1268 }
1269 #undef add_dynamic_entry
1270
1271 return TRUE;
1272 }
1273
1274 /* This function is called via elf_link_hash_traverse if we are
1275 creating a shared object. In the -Bsymbolic case it discards the
1276 space allocated to copy PC relative relocs against symbols which
1277 are defined in regular objects. For the normal shared case, it
1278 discards space for pc-relative relocs that have become local due to
1279 symbol visibility changes. We allocated space for them in the
1280 check_relocs routine, but we won't fill them in in the
1281 relocate_section routine.
1282
1283 We also check whether any of the remaining relocations apply
1284 against a readonly section, and set the DF_TEXTREL flag in this
1285 case. */
1286
1287 static bfd_boolean
1288 elf_m68k_discard_copies (h, inf)
1289 struct elf_link_hash_entry *h;
1290 PTR inf;
1291 {
1292 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1293 struct elf_m68k_pcrel_relocs_copied *s;
1294
1295 if (h->root.type == bfd_link_hash_warning)
1296 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1297
1298 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
1299 || (!info->symbolic
1300 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0))
1301 {
1302 if ((info->flags & DF_TEXTREL) == 0)
1303 {
1304 /* Look for relocations against read-only sections. */
1305 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1306 s != NULL;
1307 s = s->next)
1308 if ((s->section->flags & SEC_READONLY) != 0)
1309 {
1310 info->flags |= DF_TEXTREL;
1311 break;
1312 }
1313 }
1314
1315 return TRUE;
1316 }
1317
1318 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1319 s != NULL;
1320 s = s->next)
1321 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1322
1323 return TRUE;
1324 }
1325
1326 /* Relocate an M68K ELF section. */
1327
1328 static bfd_boolean
1329 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1330 contents, relocs, local_syms, local_sections)
1331 bfd *output_bfd;
1332 struct bfd_link_info *info;
1333 bfd *input_bfd;
1334 asection *input_section;
1335 bfd_byte *contents;
1336 Elf_Internal_Rela *relocs;
1337 Elf_Internal_Sym *local_syms;
1338 asection **local_sections;
1339 {
1340 bfd *dynobj;
1341 Elf_Internal_Shdr *symtab_hdr;
1342 struct elf_link_hash_entry **sym_hashes;
1343 bfd_vma *local_got_offsets;
1344 asection *sgot;
1345 asection *splt;
1346 asection *sreloc;
1347 Elf_Internal_Rela *rel;
1348 Elf_Internal_Rela *relend;
1349
1350 if (info->relocatable)
1351 return TRUE;
1352
1353 dynobj = elf_hash_table (info)->dynobj;
1354 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1355 sym_hashes = elf_sym_hashes (input_bfd);
1356 local_got_offsets = elf_local_got_offsets (input_bfd);
1357
1358 sgot = NULL;
1359 splt = NULL;
1360 sreloc = NULL;
1361
1362 rel = relocs;
1363 relend = relocs + input_section->reloc_count;
1364 for (; rel < relend; rel++)
1365 {
1366 int r_type;
1367 reloc_howto_type *howto;
1368 unsigned long r_symndx;
1369 struct elf_link_hash_entry *h;
1370 Elf_Internal_Sym *sym;
1371 asection *sec;
1372 bfd_vma relocation;
1373 bfd_boolean unresolved_reloc;
1374 bfd_reloc_status_type r;
1375
1376 r_type = ELF32_R_TYPE (rel->r_info);
1377 if (r_type < 0 || r_type >= (int) R_68K_max)
1378 {
1379 bfd_set_error (bfd_error_bad_value);
1380 return FALSE;
1381 }
1382 howto = howto_table + r_type;
1383
1384 r_symndx = ELF32_R_SYM (rel->r_info);
1385
1386 h = NULL;
1387 sym = NULL;
1388 sec = NULL;
1389 unresolved_reloc = FALSE;
1390
1391 if (r_symndx < symtab_hdr->sh_info)
1392 {
1393 sym = local_syms + r_symndx;
1394 sec = local_sections[r_symndx];
1395 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1396 }
1397 else
1398 {
1399 bfd_boolean warned;
1400
1401 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1402 r_symndx, symtab_hdr, sym_hashes,
1403 h, sec, relocation,
1404 unresolved_reloc, warned);
1405 }
1406
1407 switch (r_type)
1408 {
1409 case R_68K_GOT8:
1410 case R_68K_GOT16:
1411 case R_68K_GOT32:
1412 /* Relocation is to the address of the entry for this symbol
1413 in the global offset table. */
1414 if (h != NULL
1415 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1416 break;
1417 /* Fall through. */
1418 case R_68K_GOT8O:
1419 case R_68K_GOT16O:
1420 case R_68K_GOT32O:
1421 /* Relocation is the offset of the entry for this symbol in
1422 the global offset table. */
1423
1424 {
1425 bfd_vma off;
1426
1427 if (sgot == NULL)
1428 {
1429 sgot = bfd_get_section_by_name (dynobj, ".got");
1430 BFD_ASSERT (sgot != NULL);
1431 }
1432
1433 if (h != NULL)
1434 {
1435 bfd_boolean dyn;
1436
1437 off = h->got.offset;
1438 BFD_ASSERT (off != (bfd_vma) -1);
1439
1440 dyn = elf_hash_table (info)->dynamic_sections_created;
1441 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1442 || (info->shared
1443 && (info->symbolic
1444 || h->dynindx == -1
1445 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
1446 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) != 0)
1447 {
1448 /* This is actually a static link, or it is a
1449 -Bsymbolic link and the symbol is defined
1450 locally, or the symbol was forced to be local
1451 because of a version file.. We must initialize
1452 this entry in the global offset table. Since
1453 the offset must always be a multiple of 4, we
1454 use the least significant bit to record whether
1455 we have initialized it already.
1456
1457 When doing a dynamic link, we create a .rela.got
1458 relocation entry to initialize the value. This
1459 is done in the finish_dynamic_symbol routine. */
1460 if ((off & 1) != 0)
1461 off &= ~1;
1462 else
1463 {
1464 bfd_put_32 (output_bfd, relocation,
1465 sgot->contents + off);
1466 h->got.offset |= 1;
1467 }
1468 }
1469 else
1470 unresolved_reloc = FALSE;
1471 }
1472 else
1473 {
1474 BFD_ASSERT (local_got_offsets != NULL
1475 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1476
1477 off = local_got_offsets[r_symndx];
1478
1479 /* The offset must always be a multiple of 4. We use
1480 the least significant bit to record whether we have
1481 already generated the necessary reloc. */
1482 if ((off & 1) != 0)
1483 off &= ~1;
1484 else
1485 {
1486 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1487
1488 if (info->shared)
1489 {
1490 asection *s;
1491 Elf_Internal_Rela outrel;
1492 bfd_byte *loc;
1493
1494 s = bfd_get_section_by_name (dynobj, ".rela.got");
1495 BFD_ASSERT (s != NULL);
1496
1497 outrel.r_offset = (sgot->output_section->vma
1498 + sgot->output_offset
1499 + off);
1500 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1501 outrel.r_addend = relocation;
1502 loc = s->contents;
1503 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1504 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1505 }
1506
1507 local_got_offsets[r_symndx] |= 1;
1508 }
1509 }
1510
1511 relocation = sgot->output_offset + off;
1512 if (r_type == R_68K_GOT8O
1513 || r_type == R_68K_GOT16O
1514 || r_type == R_68K_GOT32O)
1515 {
1516 /* This relocation does not use the addend. */
1517 rel->r_addend = 0;
1518 }
1519 else
1520 relocation += sgot->output_section->vma;
1521 }
1522 break;
1523
1524 case R_68K_PLT8:
1525 case R_68K_PLT16:
1526 case R_68K_PLT32:
1527 /* Relocation is to the entry for this symbol in the
1528 procedure linkage table. */
1529
1530 /* Resolve a PLTxx reloc against a local symbol directly,
1531 without using the procedure linkage table. */
1532 if (h == NULL)
1533 break;
1534
1535 if (h->plt.offset == (bfd_vma) -1
1536 || !elf_hash_table (info)->dynamic_sections_created)
1537 {
1538 /* We didn't make a PLT entry for this symbol. This
1539 happens when statically linking PIC code, or when
1540 using -Bsymbolic. */
1541 break;
1542 }
1543
1544 if (splt == NULL)
1545 {
1546 splt = bfd_get_section_by_name (dynobj, ".plt");
1547 BFD_ASSERT (splt != NULL);
1548 }
1549
1550 relocation = (splt->output_section->vma
1551 + splt->output_offset
1552 + h->plt.offset);
1553 unresolved_reloc = FALSE;
1554 break;
1555
1556 case R_68K_PLT8O:
1557 case R_68K_PLT16O:
1558 case R_68K_PLT32O:
1559 /* Relocation is the offset of the entry for this symbol in
1560 the procedure linkage table. */
1561 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1562
1563 if (splt == NULL)
1564 {
1565 splt = bfd_get_section_by_name (dynobj, ".plt");
1566 BFD_ASSERT (splt != NULL);
1567 }
1568
1569 relocation = h->plt.offset;
1570 unresolved_reloc = FALSE;
1571
1572 /* This relocation does not use the addend. */
1573 rel->r_addend = 0;
1574
1575 break;
1576
1577 case R_68K_PC8:
1578 case R_68K_PC16:
1579 case R_68K_PC32:
1580 if (h == NULL
1581 || (info->shared
1582 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1583 break;
1584 /* Fall through. */
1585 case R_68K_8:
1586 case R_68K_16:
1587 case R_68K_32:
1588 if (info->shared
1589 && r_symndx != 0
1590 && (input_section->flags & SEC_ALLOC) != 0
1591 && (h == NULL
1592 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1593 || h->root.type != bfd_link_hash_undefweak)
1594 && ((r_type != R_68K_PC8
1595 && r_type != R_68K_PC16
1596 && r_type != R_68K_PC32)
1597 || (h != NULL
1598 && h->dynindx != -1
1599 && (!info->symbolic
1600 || (h->elf_link_hash_flags
1601 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1602 {
1603 Elf_Internal_Rela outrel;
1604 bfd_byte *loc;
1605 bfd_boolean skip, relocate;
1606
1607 /* When generating a shared object, these relocations
1608 are copied into the output file to be resolved at run
1609 time. */
1610
1611 skip = FALSE;
1612 relocate = FALSE;
1613
1614 outrel.r_offset =
1615 _bfd_elf_section_offset (output_bfd, info, input_section,
1616 rel->r_offset);
1617 if (outrel.r_offset == (bfd_vma) -1)
1618 skip = TRUE;
1619 else if (outrel.r_offset == (bfd_vma) -2)
1620 skip = TRUE, relocate = TRUE;
1621 outrel.r_offset += (input_section->output_section->vma
1622 + input_section->output_offset);
1623
1624 if (skip)
1625 memset (&outrel, 0, sizeof outrel);
1626 else if (h != NULL
1627 && h->dynindx != -1
1628 && (r_type == R_68K_PC8
1629 || r_type == R_68K_PC16
1630 || r_type == R_68K_PC32
1631 || !info->shared
1632 || !info->symbolic
1633 || (h->elf_link_hash_flags
1634 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1635 {
1636 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1637 outrel.r_addend = rel->r_addend;
1638 }
1639 else
1640 {
1641 /* This symbol is local, or marked to become local. */
1642 if (r_type == R_68K_32)
1643 {
1644 relocate = TRUE;
1645 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1646 outrel.r_addend = relocation + rel->r_addend;
1647 }
1648 else
1649 {
1650 long indx;
1651
1652 if (bfd_is_abs_section (sec))
1653 indx = 0;
1654 else if (sec == NULL || sec->owner == NULL)
1655 {
1656 bfd_set_error (bfd_error_bad_value);
1657 return FALSE;
1658 }
1659 else
1660 {
1661 asection *osec;
1662
1663 osec = sec->output_section;
1664 indx = elf_section_data (osec)->dynindx;
1665 BFD_ASSERT (indx > 0);
1666 }
1667
1668 outrel.r_info = ELF32_R_INFO (indx, r_type);
1669 outrel.r_addend = relocation + rel->r_addend;
1670 }
1671 }
1672
1673 sreloc = elf_section_data (input_section)->sreloc;
1674 if (sreloc == NULL)
1675 abort ();
1676
1677 loc = sreloc->contents;
1678 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1679 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1680
1681 /* This reloc will be computed at runtime, so there's no
1682 need to do anything now, except for R_68K_32
1683 relocations that have been turned into
1684 R_68K_RELATIVE. */
1685 if (!relocate)
1686 continue;
1687 }
1688
1689 break;
1690
1691 case R_68K_GNU_VTINHERIT:
1692 case R_68K_GNU_VTENTRY:
1693 /* These are no-ops in the end. */
1694 continue;
1695
1696 default:
1697 break;
1698 }
1699
1700 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1701 because such sections are not SEC_ALLOC and thus ld.so will
1702 not process them. */
1703 if (unresolved_reloc
1704 && !((input_section->flags & SEC_DEBUGGING) != 0
1705 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1706 {
1707 (*_bfd_error_handler)
1708 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
1709 input_bfd,
1710 input_section,
1711 (long) rel->r_offset,
1712 h->root.root.string);
1713 return FALSE;
1714 }
1715
1716 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1717 contents, rel->r_offset,
1718 relocation, rel->r_addend);
1719
1720 if (r != bfd_reloc_ok)
1721 {
1722 const char *name;
1723
1724 if (h != NULL)
1725 name = h->root.root.string;
1726 else
1727 {
1728 name = bfd_elf_string_from_elf_section (input_bfd,
1729 symtab_hdr->sh_link,
1730 sym->st_name);
1731 if (name == NULL)
1732 return FALSE;
1733 if (*name == '\0')
1734 name = bfd_section_name (input_bfd, sec);
1735 }
1736
1737 if (r == bfd_reloc_overflow)
1738 {
1739 if (!(info->callbacks->reloc_overflow
1740 (info, name, howto->name, (bfd_vma) 0,
1741 input_bfd, input_section, rel->r_offset)))
1742 return FALSE;
1743 }
1744 else
1745 {
1746 (*_bfd_error_handler)
1747 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
1748 input_bfd, input_section,
1749 (long) rel->r_offset, name, (int) r);
1750 return FALSE;
1751 }
1752 }
1753 }
1754
1755 return TRUE;
1756 }
1757
1758 /* Finish up dynamic symbol handling. We set the contents of various
1759 dynamic sections here. */
1760
1761 static bfd_boolean
1762 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1763 bfd *output_bfd;
1764 struct bfd_link_info *info;
1765 struct elf_link_hash_entry *h;
1766 Elf_Internal_Sym *sym;
1767 {
1768 bfd *dynobj;
1769 int plt_off1, plt_off2, plt_off3;
1770
1771 dynobj = elf_hash_table (info)->dynobj;
1772
1773 if (h->plt.offset != (bfd_vma) -1)
1774 {
1775 asection *splt;
1776 asection *sgot;
1777 asection *srela;
1778 bfd_vma plt_index;
1779 bfd_vma got_offset;
1780 Elf_Internal_Rela rela;
1781 bfd_byte *loc;
1782
1783 /* This symbol has an entry in the procedure linkage table. Set
1784 it up. */
1785
1786 BFD_ASSERT (h->dynindx != -1);
1787
1788 splt = bfd_get_section_by_name (dynobj, ".plt");
1789 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1790 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1791 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1792
1793 /* Get the index in the procedure linkage table which
1794 corresponds to this symbol. This is the index of this symbol
1795 in all the symbols for which we are making plt entries. The
1796 first entry in the procedure linkage table is reserved. */
1797 if ( CPU32_FLAG (output_bfd))
1798 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1799 else
1800 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1801
1802 /* Get the offset into the .got table of the entry that
1803 corresponds to this function. Each .got entry is 4 bytes.
1804 The first three are reserved. */
1805 got_offset = (plt_index + 3) * 4;
1806
1807 if ( CPU32_FLAG (output_bfd))
1808 {
1809 /* Fill in the entry in the procedure linkage table. */
1810 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1811 PLT_CPU32_ENTRY_SIZE);
1812 plt_off1 = 4;
1813 plt_off2 = 12;
1814 plt_off3 = 18;
1815 }
1816 else
1817 {
1818 /* Fill in the entry in the procedure linkage table. */
1819 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1820 PLT_ENTRY_SIZE);
1821 plt_off1 = 4;
1822 plt_off2 = 10;
1823 plt_off3 = 16;
1824 }
1825
1826 /* The offset is relative to the first extension word. */
1827 bfd_put_32 (output_bfd,
1828 (sgot->output_section->vma
1829 + sgot->output_offset
1830 + got_offset
1831 - (splt->output_section->vma
1832 + h->plt.offset + 2)),
1833 splt->contents + h->plt.offset + plt_off1);
1834
1835 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1836 splt->contents + h->plt.offset + plt_off2);
1837 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1838 splt->contents + h->plt.offset + plt_off3);
1839
1840 /* Fill in the entry in the global offset table. */
1841 bfd_put_32 (output_bfd,
1842 (splt->output_section->vma
1843 + splt->output_offset
1844 + h->plt.offset
1845 + 8),
1846 sgot->contents + got_offset);
1847
1848 /* Fill in the entry in the .rela.plt section. */
1849 rela.r_offset = (sgot->output_section->vma
1850 + sgot->output_offset
1851 + got_offset);
1852 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1853 rela.r_addend = 0;
1854 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1855 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1856
1857 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1858 {
1859 /* Mark the symbol as undefined, rather than as defined in
1860 the .plt section. Leave the value alone. */
1861 sym->st_shndx = SHN_UNDEF;
1862 }
1863 }
1864
1865 if (h->got.offset != (bfd_vma) -1)
1866 {
1867 asection *sgot;
1868 asection *srela;
1869 Elf_Internal_Rela rela;
1870 bfd_byte *loc;
1871
1872 /* This symbol has an entry in the global offset table. Set it
1873 up. */
1874
1875 sgot = bfd_get_section_by_name (dynobj, ".got");
1876 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1877 BFD_ASSERT (sgot != NULL && srela != NULL);
1878
1879 rela.r_offset = (sgot->output_section->vma
1880 + sgot->output_offset
1881 + (h->got.offset &~ (bfd_vma) 1));
1882
1883 /* If this is a -Bsymbolic link, and the symbol is defined
1884 locally, we just want to emit a RELATIVE reloc. Likewise if
1885 the symbol was forced to be local because of a version file.
1886 The entry in the global offset table will already have been
1887 initialized in the relocate_section function. */
1888 if (info->shared
1889 && (info->symbolic
1890 || h->dynindx == -1
1891 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
1892 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1893 {
1894 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1895 rela.r_addend = bfd_get_signed_32 (output_bfd,
1896 (sgot->contents
1897 + (h->got.offset &~ (bfd_vma) 1)));
1898 }
1899 else
1900 {
1901 bfd_put_32 (output_bfd, (bfd_vma) 0,
1902 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1903 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1904 rela.r_addend = 0;
1905 }
1906
1907 loc = srela->contents;
1908 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1909 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1910 }
1911
1912 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1913 {
1914 asection *s;
1915 Elf_Internal_Rela rela;
1916 bfd_byte *loc;
1917
1918 /* This symbol needs a copy reloc. Set it up. */
1919
1920 BFD_ASSERT (h->dynindx != -1
1921 && (h->root.type == bfd_link_hash_defined
1922 || h->root.type == bfd_link_hash_defweak));
1923
1924 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1925 ".rela.bss");
1926 BFD_ASSERT (s != NULL);
1927
1928 rela.r_offset = (h->root.u.def.value
1929 + h->root.u.def.section->output_section->vma
1930 + h->root.u.def.section->output_offset);
1931 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1932 rela.r_addend = 0;
1933 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1934 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1935 }
1936
1937 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1938 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1939 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1940 sym->st_shndx = SHN_ABS;
1941
1942 return TRUE;
1943 }
1944
1945 /* Finish up the dynamic sections. */
1946
1947 static bfd_boolean
1948 elf_m68k_finish_dynamic_sections (output_bfd, info)
1949 bfd *output_bfd;
1950 struct bfd_link_info *info;
1951 {
1952 bfd *dynobj;
1953 asection *sgot;
1954 asection *sdyn;
1955
1956 dynobj = elf_hash_table (info)->dynobj;
1957
1958 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1959 BFD_ASSERT (sgot != NULL);
1960 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1961
1962 if (elf_hash_table (info)->dynamic_sections_created)
1963 {
1964 asection *splt;
1965 Elf32_External_Dyn *dyncon, *dynconend;
1966
1967 splt = bfd_get_section_by_name (dynobj, ".plt");
1968 BFD_ASSERT (splt != NULL && sdyn != NULL);
1969
1970 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1971 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
1972 for (; dyncon < dynconend; dyncon++)
1973 {
1974 Elf_Internal_Dyn dyn;
1975 const char *name;
1976 asection *s;
1977
1978 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1979
1980 switch (dyn.d_tag)
1981 {
1982 default:
1983 break;
1984
1985 case DT_PLTGOT:
1986 name = ".got";
1987 goto get_vma;
1988 case DT_JMPREL:
1989 name = ".rela.plt";
1990 get_vma:
1991 s = bfd_get_section_by_name (output_bfd, name);
1992 BFD_ASSERT (s != NULL);
1993 dyn.d_un.d_ptr = s->vma;
1994 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1995 break;
1996
1997 case DT_PLTRELSZ:
1998 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1999 BFD_ASSERT (s != NULL);
2000 dyn.d_un.d_val = s->size;
2001 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2002 break;
2003
2004 case DT_RELASZ:
2005 /* The procedure linkage table relocs (DT_JMPREL) should
2006 not be included in the overall relocs (DT_RELA).
2007 Therefore, we override the DT_RELASZ entry here to
2008 make it not include the JMPREL relocs. Since the
2009 linker script arranges for .rela.plt to follow all
2010 other relocation sections, we don't have to worry
2011 about changing the DT_RELA entry. */
2012 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2013 if (s != NULL)
2014 dyn.d_un.d_val -= s->size;
2015 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2016 break;
2017 }
2018 }
2019
2020 /* Fill in the first entry in the procedure linkage table. */
2021 if (splt->size > 0)
2022 {
2023 if (!CPU32_FLAG (output_bfd))
2024 {
2025 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2026 bfd_put_32 (output_bfd,
2027 (sgot->output_section->vma
2028 + sgot->output_offset + 4
2029 - (splt->output_section->vma + 2)),
2030 splt->contents + 4);
2031 bfd_put_32 (output_bfd,
2032 (sgot->output_section->vma
2033 + sgot->output_offset + 8
2034 - (splt->output_section->vma + 10)),
2035 splt->contents + 12);
2036 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2037 = PLT_ENTRY_SIZE;
2038 }
2039 else /* cpu32 */
2040 {
2041 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2042 bfd_put_32 (output_bfd,
2043 (sgot->output_section->vma
2044 + sgot->output_offset + 4
2045 - (splt->output_section->vma + 2)),
2046 splt->contents + 4);
2047 bfd_put_32 (output_bfd,
2048 (sgot->output_section->vma
2049 + sgot->output_offset + 8
2050 - (splt->output_section->vma + 10)),
2051 splt->contents + 12);
2052 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2053 = PLT_CPU32_ENTRY_SIZE;
2054 }
2055 }
2056 }
2057
2058 /* Fill in the first three entries in the global offset table. */
2059 if (sgot->size > 0)
2060 {
2061 if (sdyn == NULL)
2062 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2063 else
2064 bfd_put_32 (output_bfd,
2065 sdyn->output_section->vma + sdyn->output_offset,
2066 sgot->contents);
2067 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2068 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2069 }
2070
2071 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2072
2073 return TRUE;
2074 }
2075
2076 /* Given a .data section and a .emreloc in-memory section, store
2077 relocation information into the .emreloc section which can be
2078 used at runtime to relocate the section. This is called by the
2079 linker when the --embedded-relocs switch is used. This is called
2080 after the add_symbols entry point has been called for all the
2081 objects, and before the final_link entry point is called. */
2082
2083 bfd_boolean
2084 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2085 bfd *abfd;
2086 struct bfd_link_info *info;
2087 asection *datasec;
2088 asection *relsec;
2089 char **errmsg;
2090 {
2091 Elf_Internal_Shdr *symtab_hdr;
2092 Elf_Internal_Sym *isymbuf = NULL;
2093 Elf_Internal_Rela *internal_relocs = NULL;
2094 Elf_Internal_Rela *irel, *irelend;
2095 bfd_byte *p;
2096 bfd_size_type amt;
2097
2098 BFD_ASSERT (! info->relocatable);
2099
2100 *errmsg = NULL;
2101
2102 if (datasec->reloc_count == 0)
2103 return TRUE;
2104
2105 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2106
2107 /* Get a copy of the native relocations. */
2108 internal_relocs = (_bfd_elf_link_read_relocs
2109 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2110 info->keep_memory));
2111 if (internal_relocs == NULL)
2112 goto error_return;
2113
2114 amt = (bfd_size_type) datasec->reloc_count * 12;
2115 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2116 if (relsec->contents == NULL)
2117 goto error_return;
2118
2119 p = relsec->contents;
2120
2121 irelend = internal_relocs + datasec->reloc_count;
2122 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2123 {
2124 asection *targetsec;
2125
2126 /* We are going to write a four byte longword into the runtime
2127 reloc section. The longword will be the address in the data
2128 section which must be relocated. It is followed by the name
2129 of the target section NUL-padded or truncated to 8
2130 characters. */
2131
2132 /* We can only relocate absolute longword relocs at run time. */
2133 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2134 {
2135 *errmsg = _("unsupported reloc type");
2136 bfd_set_error (bfd_error_bad_value);
2137 goto error_return;
2138 }
2139
2140 /* Get the target section referred to by the reloc. */
2141 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2142 {
2143 /* A local symbol. */
2144 Elf_Internal_Sym *isym;
2145
2146 /* Read this BFD's local symbols if we haven't done so already. */
2147 if (isymbuf == NULL)
2148 {
2149 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2150 if (isymbuf == NULL)
2151 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2152 symtab_hdr->sh_info, 0,
2153 NULL, NULL, NULL);
2154 if (isymbuf == NULL)
2155 goto error_return;
2156 }
2157
2158 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2159 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2160 }
2161 else
2162 {
2163 unsigned long indx;
2164 struct elf_link_hash_entry *h;
2165
2166 /* An external symbol. */
2167 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2168 h = elf_sym_hashes (abfd)[indx];
2169 BFD_ASSERT (h != NULL);
2170 if (h->root.type == bfd_link_hash_defined
2171 || h->root.type == bfd_link_hash_defweak)
2172 targetsec = h->root.u.def.section;
2173 else
2174 targetsec = NULL;
2175 }
2176
2177 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2178 memset (p + 4, 0, 8);
2179 if (targetsec != NULL)
2180 strncpy (p + 4, targetsec->output_section->name, 8);
2181 }
2182
2183 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2184 free (isymbuf);
2185 if (internal_relocs != NULL
2186 && elf_section_data (datasec)->relocs != internal_relocs)
2187 free (internal_relocs);
2188 return TRUE;
2189
2190 error_return:
2191 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2192 free (isymbuf);
2193 if (internal_relocs != NULL
2194 && elf_section_data (datasec)->relocs != internal_relocs)
2195 free (internal_relocs);
2196 return FALSE;
2197 }
2198
2199 static enum elf_reloc_type_class
2200 elf32_m68k_reloc_type_class (rela)
2201 const Elf_Internal_Rela *rela;
2202 {
2203 switch ((int) ELF32_R_TYPE (rela->r_info))
2204 {
2205 case R_68K_RELATIVE:
2206 return reloc_class_relative;
2207 case R_68K_JMP_SLOT:
2208 return reloc_class_plt;
2209 case R_68K_COPY:
2210 return reloc_class_copy;
2211 default:
2212 return reloc_class_normal;
2213 }
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
2246 #define elf_backend_can_gc_sections 1
2247 #define elf_backend_can_refcount 1
2248 #define elf_backend_want_got_plt 1
2249 #define elf_backend_plt_readonly 1
2250 #define elf_backend_want_plt_sym 0
2251 #define elf_backend_got_header_size 12
2252 #define elf_backend_rela_normal 1
2253
2254 #include "elf32-target.h"
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