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* config/tc-mn10200.c (md_parse_option <c, arg>): Add ATTRIBUTE_UNUSED.
[binutils.git] / bfd / elf32-m68k.c
blob0875d88bd714c05bf2831bc48d6c051d9fa0981f
1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/m68k.h"
27
28 static reloc_howto_type *reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30 static void rtype_to_howto
31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
32 static struct bfd_hash_entry *elf_m68k_link_hash_newfunc
33 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
34 static struct bfd_link_hash_table *elf_m68k_link_hash_table_create
35 PARAMS ((bfd *));
36 static bfd_boolean elf_m68k_check_relocs
37 PARAMS ((bfd *, struct bfd_link_info *, asection *,
38 const Elf_Internal_Rela *));
39 static asection *elf_m68k_gc_mark_hook
40 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
41 struct elf_link_hash_entry *, Elf_Internal_Sym *));
42 static bfd_boolean elf_m68k_gc_sweep_hook
43 PARAMS ((bfd *, struct bfd_link_info *, asection *,
44 const Elf_Internal_Rela *));
45 static bfd_boolean elf_m68k_adjust_dynamic_symbol
46 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
47 static bfd_boolean elf_m68k_size_dynamic_sections
48 PARAMS ((bfd *, struct bfd_link_info *));
49 static bfd_boolean elf_m68k_relocate_section
50 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
51 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
52 static bfd_boolean elf_m68k_finish_dynamic_symbol
53 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
54 Elf_Internal_Sym *));
55 static bfd_boolean elf_m68k_finish_dynamic_sections
56 PARAMS ((bfd *, struct bfd_link_info *));
57
58 static bfd_boolean elf32_m68k_set_private_flags
59 PARAMS ((bfd *, flagword));
60 static bfd_boolean elf32_m68k_merge_private_bfd_data
61 PARAMS ((bfd *, bfd *));
62 static bfd_boolean elf32_m68k_print_private_bfd_data
63 PARAMS ((bfd *, PTR));
64 static enum elf_reloc_type_class elf32_m68k_reloc_type_class
65 PARAMS ((const Elf_Internal_Rela *));
66
67 static reloc_howto_type howto_table[] = {
68 HOWTO(R_68K_NONE, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", FALSE, 0, 0x00000000,FALSE),
69 HOWTO(R_68K_32, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", FALSE, 0, 0xffffffff,FALSE),
70 HOWTO(R_68K_16, 0, 1,16, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", FALSE, 0, 0x0000ffff,FALSE),
71 HOWTO(R_68K_8, 0, 0, 8, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", FALSE, 0, 0x000000ff,FALSE),
72 HOWTO(R_68K_PC32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", FALSE, 0, 0xffffffff,TRUE),
73 HOWTO(R_68K_PC16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", FALSE, 0, 0x0000ffff,TRUE),
74 HOWTO(R_68K_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", FALSE, 0, 0x000000ff,TRUE),
75 HOWTO(R_68K_GOT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", FALSE, 0, 0xffffffff,TRUE),
76 HOWTO(R_68K_GOT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", FALSE, 0, 0x0000ffff,TRUE),
77 HOWTO(R_68K_GOT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", FALSE, 0, 0x000000ff,TRUE),
78 HOWTO(R_68K_GOT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", FALSE, 0, 0xffffffff,FALSE),
79 HOWTO(R_68K_GOT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", FALSE, 0, 0x0000ffff,FALSE),
80 HOWTO(R_68K_GOT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", FALSE, 0, 0x000000ff,FALSE),
81 HOWTO(R_68K_PLT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", FALSE, 0, 0xffffffff,TRUE),
82 HOWTO(R_68K_PLT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", FALSE, 0, 0x0000ffff,TRUE),
83 HOWTO(R_68K_PLT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", FALSE, 0, 0x000000ff,TRUE),
84 HOWTO(R_68K_PLT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", FALSE, 0, 0xffffffff,FALSE),
85 HOWTO(R_68K_PLT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", FALSE, 0, 0x0000ffff,FALSE),
86 HOWTO(R_68K_PLT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", FALSE, 0, 0x000000ff,FALSE),
87 HOWTO(R_68K_COPY, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", FALSE, 0, 0xffffffff,FALSE),
88 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),
89 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),
90 HOWTO(R_68K_RELATIVE, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", FALSE, 0, 0xffffffff,FALSE),
91 /* GNU extension to record C++ vtable hierarchy */
92 HOWTO (R_68K_GNU_VTINHERIT, /* type */
93 0, /* rightshift */
94 2, /* size (0 = byte, 1 = short, 2 = long) */
95 0, /* bitsize */
96 FALSE, /* pc_relative */
97 0, /* bitpos */
98 complain_overflow_dont, /* complain_on_overflow */
99 NULL, /* special_function */
100 "R_68K_GNU_VTINHERIT", /* name */
101 FALSE, /* partial_inplace */
102 0, /* src_mask */
103 0, /* dst_mask */
104 FALSE),
105 /* GNU extension to record C++ vtable member usage */
106 HOWTO (R_68K_GNU_VTENTRY, /* type */
107 0, /* rightshift */
108 2, /* size (0 = byte, 1 = short, 2 = long) */
109 0, /* bitsize */
110 FALSE, /* pc_relative */
111 0, /* bitpos */
112 complain_overflow_dont, /* complain_on_overflow */
113 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
114 "R_68K_GNU_VTENTRY", /* name */
115 FALSE, /* partial_inplace */
116 0, /* src_mask */
117 0, /* dst_mask */
118 FALSE),
119 };
120
121 static void
122 rtype_to_howto (abfd, cache_ptr, dst)
123 bfd *abfd ATTRIBUTE_UNUSED;
124 arelent *cache_ptr;
125 Elf_Internal_Rela *dst;
126 {
127 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max);
128 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
129 }
130
131 #define elf_info_to_howto rtype_to_howto
132
133 static const struct
134 {
135 bfd_reloc_code_real_type bfd_val;
136 int elf_val;
137 } reloc_map[] = {
138 { BFD_RELOC_NONE, R_68K_NONE },
139 { BFD_RELOC_32, R_68K_32 },
140 { BFD_RELOC_16, R_68K_16 },
141 { BFD_RELOC_8, R_68K_8 },
142 { BFD_RELOC_32_PCREL, R_68K_PC32 },
143 { BFD_RELOC_16_PCREL, R_68K_PC16 },
144 { BFD_RELOC_8_PCREL, R_68K_PC8 },
145 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 },
146 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 },
147 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 },
148 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O },
149 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O },
150 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O },
151 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 },
152 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 },
153 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 },
154 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O },
155 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O },
156 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O },
157 { BFD_RELOC_NONE, R_68K_COPY },
158 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT },
159 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT },
160 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE },
161 { BFD_RELOC_CTOR, R_68K_32 },
162 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT },
163 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY },
164 };
165
166 static reloc_howto_type *
167 reloc_type_lookup (abfd, code)
168 bfd *abfd ATTRIBUTE_UNUSED;
169 bfd_reloc_code_real_type code;
170 {
171 unsigned int i;
172 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
173 {
174 if (reloc_map[i].bfd_val == code)
175 return &howto_table[reloc_map[i].elf_val];
176 }
177 return 0;
178 }
179
180 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
181 #define ELF_ARCH bfd_arch_m68k
182 /* end code generated by elf.el */
183 \f
184 /* Functions for the m68k ELF linker. */
185
186 /* The name of the dynamic interpreter. This is put in the .interp
187 section. */
188
189 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
190
191 /* The size in bytes of an entry in the procedure linkage table. */
192
193 #define PLT_ENTRY_SIZE 20
194
195 /* The first entry in a procedure linkage table looks like this. See
196 the SVR4 ABI m68k supplement to see how this works. */
197
198 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
199 {
200 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
201 0, 0, 0, 0, /* replaced with offset to .got + 4. */
202 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
203 0, 0, 0, 0, /* replaced with offset to .got + 8. */
204 0, 0, 0, 0 /* pad out to 20 bytes. */
205 };
206
207 /* Subsequent entries in a procedure linkage table look like this. */
208
209 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
210 {
211 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
212 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
213 0x2f, 0x3c, /* move.l #offset,-(%sp) */
214 0, 0, 0, 0, /* replaced with offset into relocation table. */
215 0x60, 0xff, /* bra.l .plt */
216 0, 0, 0, 0 /* replaced with offset to start of .plt. */
217 };
218
219 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
220
221 #define PLT_CPU32_ENTRY_SIZE 24
222 /* Procedure linkage table entries for the cpu32 */
223 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
224 {
225 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
226 0, 0, 0, 0, /* replaced with offset to .got + 4. */
227 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
228 0, 0, 0, 0, /* replace with offset to .got +8. */
229 0x4e, 0xd1, /* jmp %a1@ */
230 0, 0, 0, 0, /* pad out to 24 bytes. */
231 0, 0
232 };
233
234 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
235 {
236 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
237 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
238 0x4e, 0xd1, /* jmp %a1@ */
239 0x2f, 0x3c, /* move.l #offset,-(%sp) */
240 0, 0, 0, 0, /* replaced with offset into relocation table. */
241 0x60, 0xff, /* bra.l .plt */
242 0, 0, 0, 0, /* replaced with offset to start of .plt. */
243 0, 0
244 };
245
246 /* The m68k linker needs to keep track of the number of relocs that it
247 decides to copy in check_relocs for each symbol. This is so that it
248 can discard PC relative relocs if it doesn't need them when linking
249 with -Bsymbolic. We store the information in a field extending the
250 regular ELF linker hash table. */
251
252 /* This structure keeps track of the number of PC relative relocs we have
253 copied for a given symbol. */
254
255 struct elf_m68k_pcrel_relocs_copied
256 {
257 /* Next section. */
258 struct elf_m68k_pcrel_relocs_copied *next;
259 /* A section in dynobj. */
260 asection *section;
261 /* Number of relocs copied in this section. */
262 bfd_size_type count;
263 };
264
265 /* m68k ELF linker hash entry. */
266
267 struct elf_m68k_link_hash_entry
268 {
269 struct elf_link_hash_entry root;
270
271 /* Number of PC relative relocs copied for this symbol. */
272 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
273 };
274
275 /* m68k ELF linker hash table. */
276
277 struct elf_m68k_link_hash_table
278 {
279 struct elf_link_hash_table root;
280
281 /* Small local sym to section mapping cache. */
282 struct sym_sec_cache sym_sec;
283 };
284
285 /* Declare this now that the above structures are defined. */
286
287 static bfd_boolean elf_m68k_discard_copies
288 PARAMS ((struct elf_m68k_link_hash_entry *, PTR));
289
290 /* Traverse an m68k ELF linker hash table. */
291
292 #define elf_m68k_link_hash_traverse(table, func, info) \
293 (elf_link_hash_traverse \
294 (&(table)->root, \
295 (bfd_boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
296 (info)))
297
298 /* Get the m68k ELF linker hash table from a link_info structure. */
299
300 #define elf_m68k_hash_table(p) \
301 ((struct elf_m68k_link_hash_table *) (p)->hash)
302
303 /* Create an entry in an m68k ELF linker hash table. */
304
305 static struct bfd_hash_entry *
306 elf_m68k_link_hash_newfunc (entry, table, string)
307 struct bfd_hash_entry *entry;
308 struct bfd_hash_table *table;
309 const char *string;
310 {
311 struct elf_m68k_link_hash_entry *ret =
312 (struct elf_m68k_link_hash_entry *) entry;
313
314 /* Allocate the structure if it has not already been allocated by a
315 subclass. */
316 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
317 ret = ((struct elf_m68k_link_hash_entry *)
318 bfd_hash_allocate (table,
319 sizeof (struct elf_m68k_link_hash_entry)));
320 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
321 return (struct bfd_hash_entry *) ret;
322
323 /* Call the allocation method of the superclass. */
324 ret = ((struct elf_m68k_link_hash_entry *)
325 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
326 table, string));
327 if (ret != (struct elf_m68k_link_hash_entry *) NULL)
328 {
329 ret->pcrel_relocs_copied = NULL;
330 }
331
332 return (struct bfd_hash_entry *) ret;
333 }
334
335 /* Create an m68k ELF linker hash table. */
336
337 static struct bfd_link_hash_table *
338 elf_m68k_link_hash_table_create (abfd)
339 bfd *abfd;
340 {
341 struct elf_m68k_link_hash_table *ret;
342 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table);
343
344 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt);
345 if (ret == (struct elf_m68k_link_hash_table *) NULL)
346 return NULL;
347
348 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
349 elf_m68k_link_hash_newfunc))
350 {
351 free (ret);
352 return NULL;
353 }
354
355 ret->sym_sec.abfd = NULL;
356
357 return &ret->root.root;
358 }
359
360 /* Keep m68k-specific flags in the ELF header */
361 static bfd_boolean
362 elf32_m68k_set_private_flags (abfd, flags)
363 bfd *abfd;
364 flagword flags;
365 {
366 elf_elfheader (abfd)->e_flags = flags;
367 elf_flags_init (abfd) = TRUE;
368 return TRUE;
369 }
370
371 /* Merge backend specific data from an object file to the output
372 object file when linking. */
373 static bfd_boolean
374 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
375 bfd *ibfd;
376 bfd *obfd;
377 {
378 flagword out_flags;
379 flagword in_flags;
380
381 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
382 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
383 return TRUE;
384
385 in_flags = elf_elfheader (ibfd)->e_flags;
386 out_flags = elf_elfheader (obfd)->e_flags;
387
388 if (!elf_flags_init (obfd))
389 {
390 elf_flags_init (obfd) = TRUE;
391 elf_elfheader (obfd)->e_flags = in_flags;
392 }
393
394 return TRUE;
395 }
396
397 /* Display the flags field */
398 static bfd_boolean
399 elf32_m68k_print_private_bfd_data (abfd, ptr)
400 bfd *abfd;
401 PTR ptr;
402 {
403 FILE *file = (FILE *) ptr;
404
405 BFD_ASSERT (abfd != NULL && ptr != NULL);
406
407 /* Print normal ELF private data. */
408 _bfd_elf_print_private_bfd_data (abfd, ptr);
409
410 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
411
412 /* xgettext:c-format */
413 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
414
415 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
416 fprintf (file, _(" [cpu32]"));
417
418 if (elf_elfheader (abfd)->e_flags & EF_M68000)
419 fprintf (file, _(" [m68000]"));
420
421 fputc ('\n', file);
422
423 return TRUE;
424 }
425 /* Look through the relocs for a section during the first phase, and
426 allocate space in the global offset table or procedure linkage
427 table. */
428
429 static bfd_boolean
430 elf_m68k_check_relocs (abfd, info, sec, relocs)
431 bfd *abfd;
432 struct bfd_link_info *info;
433 asection *sec;
434 const Elf_Internal_Rela *relocs;
435 {
436 bfd *dynobj;
437 Elf_Internal_Shdr *symtab_hdr;
438 struct elf_link_hash_entry **sym_hashes;
439 bfd_signed_vma *local_got_refcounts;
440 const Elf_Internal_Rela *rel;
441 const Elf_Internal_Rela *rel_end;
442 asection *sgot;
443 asection *srelgot;
444 asection *sreloc;
445
446 if (info->relocateable)
447 return TRUE;
448
449 dynobj = elf_hash_table (info)->dynobj;
450 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
451 sym_hashes = elf_sym_hashes (abfd);
452 local_got_refcounts = elf_local_got_refcounts (abfd);
453
454 sgot = NULL;
455 srelgot = NULL;
456 sreloc = NULL;
457
458 rel_end = relocs + sec->reloc_count;
459 for (rel = relocs; rel < rel_end; rel++)
460 {
461 unsigned long r_symndx;
462 struct elf_link_hash_entry *h;
463
464 r_symndx = ELF32_R_SYM (rel->r_info);
465
466 if (r_symndx < symtab_hdr->sh_info)
467 h = NULL;
468 else
469 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
470
471 switch (ELF32_R_TYPE (rel->r_info))
472 {
473 case R_68K_GOT8:
474 case R_68K_GOT16:
475 case R_68K_GOT32:
476 if (h != NULL
477 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
478 break;
479 /* Fall through. */
480 case R_68K_GOT8O:
481 case R_68K_GOT16O:
482 case R_68K_GOT32O:
483 /* This symbol requires a global offset table entry. */
484
485 if (dynobj == NULL)
486 {
487 /* Create the .got section. */
488 elf_hash_table (info)->dynobj = dynobj = abfd;
489 if (!_bfd_elf_create_got_section (dynobj, info))
490 return FALSE;
491 }
492
493 if (sgot == NULL)
494 {
495 sgot = bfd_get_section_by_name (dynobj, ".got");
496 BFD_ASSERT (sgot != NULL);
497 }
498
499 if (srelgot == NULL
500 && (h != NULL || info->shared))
501 {
502 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
503 if (srelgot == NULL)
504 {
505 srelgot = bfd_make_section (dynobj, ".rela.got");
506 if (srelgot == NULL
507 || !bfd_set_section_flags (dynobj, srelgot,
508 (SEC_ALLOC
509 | SEC_LOAD
510 | SEC_HAS_CONTENTS
511 | SEC_IN_MEMORY
512 | SEC_LINKER_CREATED
513 | SEC_READONLY))
514 || !bfd_set_section_alignment (dynobj, srelgot, 2))
515 return FALSE;
516 }
517 }
518
519 if (h != NULL)
520 {
521 if (h->got.refcount == 0)
522 {
523 /* Make sure this symbol is output as a dynamic symbol. */
524 if (h->dynindx == -1
525 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
526 {
527 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
528 return FALSE;
529 }
530
531 /* Allocate space in the .got section. */
532 sgot->_raw_size += 4;
533 /* Allocate relocation space. */
534 srelgot->_raw_size += sizeof (Elf32_External_Rela);
535 }
536 h->got.refcount++;
537 }
538 else
539 {
540 /* This is a global offset table entry for a local symbol. */
541 if (local_got_refcounts == NULL)
542 {
543 bfd_size_type size;
544
545 size = symtab_hdr->sh_info;
546 size *= sizeof (bfd_signed_vma);
547 local_got_refcounts = ((bfd_signed_vma *)
548 bfd_zalloc (abfd, size));
549 if (local_got_refcounts == NULL)
550 return FALSE;
551 elf_local_got_refcounts (abfd) = local_got_refcounts;
552 }
553 if (local_got_refcounts[r_symndx] == 0)
554 {
555 sgot->_raw_size += 4;
556 if (info->shared)
557 {
558 /* If we are generating a shared object, we need to
559 output a R_68K_RELATIVE reloc so that the dynamic
560 linker can adjust this GOT entry. */
561 srelgot->_raw_size += sizeof (Elf32_External_Rela);
562 }
563 }
564 local_got_refcounts[r_symndx]++;
565 }
566 break;
567
568 case R_68K_PLT8:
569 case R_68K_PLT16:
570 case R_68K_PLT32:
571 /* This symbol requires a procedure linkage table entry. We
572 actually build the entry in adjust_dynamic_symbol,
573 because this might be a case of linking PIC code which is
574 never referenced by a dynamic object, in which case we
575 don't need to generate a procedure linkage table entry
576 after all. */
577
578 /* If this is a local symbol, we resolve it directly without
579 creating a procedure linkage table entry. */
580 if (h == NULL)
581 continue;
582
583 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
584 h->plt.refcount++;
585 break;
586
587 case R_68K_PLT8O:
588 case R_68K_PLT16O:
589 case R_68K_PLT32O:
590 /* This symbol requires a procedure linkage table entry. */
591
592 if (h == NULL)
593 {
594 /* It does not make sense to have this relocation for a
595 local symbol. FIXME: does it? How to handle it if
596 it does make sense? */
597 bfd_set_error (bfd_error_bad_value);
598 return FALSE;
599 }
600
601 /* Make sure this symbol is output as a dynamic symbol. */
602 if (h->dynindx == -1
603 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
604 {
605 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
606 return FALSE;
607 }
608
609 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
610 h->plt.refcount++;
611 break;
612
613 case R_68K_PC8:
614 case R_68K_PC16:
615 case R_68K_PC32:
616 /* If we are creating a shared library and this is not a local
617 symbol, we need to copy the reloc into the shared library.
618 However when linking with -Bsymbolic and this is a global
619 symbol which is defined in an object we are including in the
620 link (i.e., DEF_REGULAR is set), then we can resolve the
621 reloc directly. At this point we have not seen all the input
622 files, so it is possible that DEF_REGULAR is not set now but
623 will be set later (it is never cleared). We account for that
624 possibility below by storing information in the
625 pcrel_relocs_copied field of the hash table entry. */
626 if (!(info->shared
627 && (sec->flags & SEC_ALLOC) != 0
628 && h != NULL
629 && (!info->symbolic
630 || h->root.type == bfd_link_hash_defweak
631 || (h->elf_link_hash_flags
632 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
633 {
634 if (h != NULL)
635 {
636 /* Make sure a plt entry is created for this symbol if
637 it turns out to be a function defined by a dynamic
638 object. */
639 h->plt.refcount++;
640 }
641 break;
642 }
643 /* Fall through. */
644 case R_68K_8:
645 case R_68K_16:
646 case R_68K_32:
647 if (h != NULL)
648 {
649 /* Make sure a plt entry is created for this symbol if it
650 turns out to be a function defined by a dynamic object. */
651 h->plt.refcount++;
652 }
653
654 /* If we are creating a shared library, we need to copy the
655 reloc into the shared library. */
656 if (info->shared
657 && (sec->flags & SEC_ALLOC) != 0)
658 {
659 /* When creating a shared object, we must copy these
660 reloc types into the output file. We create a reloc
661 section in dynobj and make room for this reloc. */
662 if (sreloc == NULL)
663 {
664 const char *name;
665
666 name = (bfd_elf_string_from_elf_section
667 (abfd,
668 elf_elfheader (abfd)->e_shstrndx,
669 elf_section_data (sec)->rel_hdr.sh_name));
670 if (name == NULL)
671 return FALSE;
672
673 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
674 && strcmp (bfd_get_section_name (abfd, sec),
675 name + 5) == 0);
676
677 sreloc = bfd_get_section_by_name (dynobj, name);
678 if (sreloc == NULL)
679 {
680 sreloc = bfd_make_section (dynobj, name);
681 if (sreloc == NULL
682 || !bfd_set_section_flags (dynobj, sreloc,
683 (SEC_ALLOC
684 | SEC_LOAD
685 | SEC_HAS_CONTENTS
686 | SEC_IN_MEMORY
687 | SEC_LINKER_CREATED
688 | SEC_READONLY))
689 || !bfd_set_section_alignment (dynobj, sreloc, 2))
690 return FALSE;
691 }
692 if (sec->flags & SEC_READONLY)
693 info->flags |= DF_TEXTREL;
694 }
695
696 sreloc->_raw_size += sizeof (Elf32_External_Rela);
697
698 /* We count the number of PC relative relocations we have
699 entered for this symbol, so that we can discard them
700 again if, in the -Bsymbolic case, the symbol is later
701 defined by a regular object, or, in the normal shared
702 case, the symbol is forced to be local. Note that this
703 function is only called if we are using an m68kelf linker
704 hash table, which means that h is really a pointer to an
705 elf_m68k_link_hash_entry. */
706 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8
707 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
708 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
709 {
710 struct elf_m68k_pcrel_relocs_copied *p;
711 struct elf_m68k_pcrel_relocs_copied **head;
712
713 if (h != NULL)
714 {
715 struct elf_m68k_link_hash_entry *eh
716 = (struct elf_m68k_link_hash_entry *) h;
717 head = &eh->pcrel_relocs_copied;
718 }
719 else
720 {
721 asection *s;
722 s = (bfd_section_from_r_symndx
723 (abfd, &elf_m68k_hash_table (info)->sym_sec,
724 sec, r_symndx));
725 if (s == NULL)
726 return FALSE;
727
728 head = ((struct elf_m68k_pcrel_relocs_copied **)
729 &elf_section_data (s)->local_dynrel);
730 }
731
732 for (p = *head; p != NULL; p = p->next)
733 if (p->section == sreloc)
734 break;
735
736 if (p == NULL)
737 {
738 p = ((struct elf_m68k_pcrel_relocs_copied *)
739 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
740 if (p == NULL)
741 return FALSE;
742 p->next = *head;
743 *head = p;
744 p->section = sreloc;
745 p->count = 0;
746 }
747
748 ++p->count;
749 }
750 }
751
752 break;
753
754 /* This relocation describes the C++ object vtable hierarchy.
755 Reconstruct it for later use during GC. */
756 case R_68K_GNU_VTINHERIT:
757 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
758 return FALSE;
759 break;
760
761 /* This relocation describes which C++ vtable entries are actually
762 used. Record for later use during GC. */
763 case R_68K_GNU_VTENTRY:
764 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
765 return FALSE;
766 break;
767
768 default:
769 break;
770 }
771 }
772
773 return TRUE;
774 }
775
776 /* Return the section that should be marked against GC for a given
777 relocation. */
778
779 static asection *
780 elf_m68k_gc_mark_hook (sec, info, rel, h, sym)
781 asection *sec;
782 struct bfd_link_info *info ATTRIBUTE_UNUSED;
783 Elf_Internal_Rela *rel;
784 struct elf_link_hash_entry *h;
785 Elf_Internal_Sym *sym;
786 {
787 if (h != NULL)
788 {
789 switch (ELF32_R_TYPE (rel->r_info))
790 {
791 case R_68K_GNU_VTINHERIT:
792 case R_68K_GNU_VTENTRY:
793 break;
794
795 default:
796 switch (h->root.type)
797 {
798 default:
799 break;
800
801 case bfd_link_hash_defined:
802 case bfd_link_hash_defweak:
803 return h->root.u.def.section;
804
805 case bfd_link_hash_common:
806 return h->root.u.c.p->section;
807 }
808 }
809 }
810 else
811 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
812
813 return NULL;
814 }
815
816 /* Update the got entry reference counts for the section being removed. */
817
818 static bfd_boolean
819 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
820 bfd *abfd;
821 struct bfd_link_info *info;
822 asection *sec;
823 const Elf_Internal_Rela *relocs;
824 {
825 Elf_Internal_Shdr *symtab_hdr;
826 struct elf_link_hash_entry **sym_hashes;
827 bfd_signed_vma *local_got_refcounts;
828 const Elf_Internal_Rela *rel, *relend;
829 unsigned long r_symndx;
830 struct elf_link_hash_entry *h;
831 bfd *dynobj;
832 asection *sgot;
833 asection *srelgot;
834
835 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
836 sym_hashes = elf_sym_hashes (abfd);
837 local_got_refcounts = elf_local_got_refcounts (abfd);
838
839 dynobj = elf_hash_table (info)->dynobj;
840 if (dynobj == NULL)
841 return TRUE;
842
843 sgot = bfd_get_section_by_name (dynobj, ".got");
844 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
845
846 relend = relocs + sec->reloc_count;
847 for (rel = relocs; rel < relend; rel++)
848 {
849 switch (ELF32_R_TYPE (rel->r_info))
850 {
851 case R_68K_GOT8:
852 case R_68K_GOT16:
853 case R_68K_GOT32:
854 case R_68K_GOT8O:
855 case R_68K_GOT16O:
856 case R_68K_GOT32O:
857 r_symndx = ELF32_R_SYM (rel->r_info);
858 if (r_symndx >= symtab_hdr->sh_info)
859 {
860 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
861 if (h->got.refcount > 0)
862 {
863 --h->got.refcount;
864 if (h->got.refcount == 0)
865 {
866 /* We don't need the .got entry any more. */
867 sgot->_raw_size -= 4;
868 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
869 }
870 }
871 }
872 else if (local_got_refcounts != NULL)
873 {
874 if (local_got_refcounts[r_symndx] > 0)
875 {
876 --local_got_refcounts[r_symndx];
877 if (local_got_refcounts[r_symndx] == 0)
878 {
879 /* We don't need the .got entry any more. */
880 sgot->_raw_size -= 4;
881 if (info->shared)
882 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
883 }
884 }
885 }
886 break;
887
888 case R_68K_PLT8:
889 case R_68K_PLT16:
890 case R_68K_PLT32:
891 case R_68K_PLT8O:
892 case R_68K_PLT16O:
893 case R_68K_PLT32O:
894 case R_68K_PC8:
895 case R_68K_PC16:
896 case R_68K_PC32:
897 case R_68K_8:
898 case R_68K_16:
899 case R_68K_32:
900 r_symndx = ELF32_R_SYM (rel->r_info);
901 if (r_symndx >= symtab_hdr->sh_info)
902 {
903 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
904 if (h->plt.refcount > 0)
905 --h->plt.refcount;
906 }
907 break;
908
909 default:
910 break;
911 }
912 }
913
914 return TRUE;
915 }
916
917 /* Adjust a symbol defined by a dynamic object and referenced by a
918 regular object. The current definition is in some section of the
919 dynamic object, but we're not including those sections. We have to
920 change the definition to something the rest of the link can
921 understand. */
922
923 static bfd_boolean
924 elf_m68k_adjust_dynamic_symbol (info, h)
925 struct bfd_link_info *info;
926 struct elf_link_hash_entry *h;
927 {
928 bfd *dynobj;
929 asection *s;
930 unsigned int power_of_two;
931
932 dynobj = elf_hash_table (info)->dynobj;
933
934 /* Make sure we know what is going on here. */
935 BFD_ASSERT (dynobj != NULL
936 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
937 || h->weakdef != NULL
938 || ((h->elf_link_hash_flags
939 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
940 && (h->elf_link_hash_flags
941 & ELF_LINK_HASH_REF_REGULAR) != 0
942 && (h->elf_link_hash_flags
943 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
944
945 /* If this is a function, put it in the procedure linkage table. We
946 will fill in the contents of the procedure linkage table later,
947 when we know the address of the .got section. */
948 if (h->type == STT_FUNC
949 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
950 {
951 if (! info->shared
952 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
953 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
954 /* We must always create the plt entry if it was referenced
955 by a PLTxxO relocation. In this case we already recorded
956 it as a dynamic symbol. */
957 && h->dynindx == -1)
958 {
959 /* This case can occur if we saw a PLTxx reloc in an input
960 file, but the symbol was never referred to by a dynamic
961 object. In such a case, we don't actually need to build
962 a procedure linkage table, and we can just do a PCxx
963 reloc instead. */
964 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
965 h->plt.offset = (bfd_vma) -1;
966 return TRUE;
967 }
968
969 /* GC may have rendered this entry unused. */
970 if (h->plt.refcount <= 0)
971 {
972 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
973 h->plt.offset = (bfd_vma) -1;
974 return TRUE;
975 }
976
977 /* Make sure this symbol is output as a dynamic symbol. */
978 if (h->dynindx == -1
979 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
980 {
981 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
982 return FALSE;
983 }
984
985 s = bfd_get_section_by_name (dynobj, ".plt");
986 BFD_ASSERT (s != NULL);
987
988 /* If this is the first .plt entry, make room for the special
989 first entry. */
990 if (s->_raw_size == 0)
991 {
992 if (CPU32_FLAG (dynobj))
993 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
994 else
995 s->_raw_size += PLT_ENTRY_SIZE;
996 }
997
998 /* If this symbol is not defined in a regular file, and we are
999 not generating a shared library, then set the symbol to this
1000 location in the .plt. This is required to make function
1001 pointers compare as equal between the normal executable and
1002 the shared library. */
1003 if (!info->shared
1004 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1005 {
1006 h->root.u.def.section = s;
1007 h->root.u.def.value = s->_raw_size;
1008 }
1009
1010 h->plt.offset = s->_raw_size;
1011
1012 /* Make room for this entry. */
1013 if (CPU32_FLAG (dynobj))
1014 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1015 else
1016 s->_raw_size += PLT_ENTRY_SIZE;
1017
1018 /* We also need to make an entry in the .got.plt section, which
1019 will be placed in the .got section by the linker script. */
1020
1021 s = bfd_get_section_by_name (dynobj, ".got.plt");
1022 BFD_ASSERT (s != NULL);
1023 s->_raw_size += 4;
1024
1025 /* We also need to make an entry in the .rela.plt section. */
1026
1027 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1028 BFD_ASSERT (s != NULL);
1029 s->_raw_size += sizeof (Elf32_External_Rela);
1030
1031 return TRUE;
1032 }
1033
1034 /* Reinitialize the plt offset now that it is not used as a reference
1035 count any more. */
1036 h->plt.offset = (bfd_vma) -1;
1037
1038 /* If this is a weak symbol, and there is a real definition, the
1039 processor independent code will have arranged for us to see the
1040 real definition first, and we can just use the same value. */
1041 if (h->weakdef != NULL)
1042 {
1043 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1044 || h->weakdef->root.type == bfd_link_hash_defweak);
1045 h->root.u.def.section = h->weakdef->root.u.def.section;
1046 h->root.u.def.value = h->weakdef->root.u.def.value;
1047 return TRUE;
1048 }
1049
1050 /* This is a reference to a symbol defined by a dynamic object which
1051 is not a function. */
1052
1053 /* If we are creating a shared library, we must presume that the
1054 only references to the symbol are via the global offset table.
1055 For such cases we need not do anything here; the relocations will
1056 be handled correctly by relocate_section. */
1057 if (info->shared)
1058 return TRUE;
1059
1060 /* We must allocate the symbol in our .dynbss section, which will
1061 become part of the .bss section of the executable. There will be
1062 an entry for this symbol in the .dynsym section. The dynamic
1063 object will contain position independent code, so all references
1064 from the dynamic object to this symbol will go through the global
1065 offset table. The dynamic linker will use the .dynsym entry to
1066 determine the address it must put in the global offset table, so
1067 both the dynamic object and the regular object will refer to the
1068 same memory location for the variable. */
1069
1070 s = bfd_get_section_by_name (dynobj, ".dynbss");
1071 BFD_ASSERT (s != NULL);
1072
1073 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1074 copy the initial value out of the dynamic object and into the
1075 runtime process image. We need to remember the offset into the
1076 .rela.bss section we are going to use. */
1077 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1078 {
1079 asection *srel;
1080
1081 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1082 BFD_ASSERT (srel != NULL);
1083 srel->_raw_size += sizeof (Elf32_External_Rela);
1084 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1085 }
1086
1087 /* We need to figure out the alignment required for this symbol. I
1088 have no idea how ELF linkers handle this. */
1089 power_of_two = bfd_log2 (h->size);
1090 if (power_of_two > 3)
1091 power_of_two = 3;
1092
1093 /* Apply the required alignment. */
1094 s->_raw_size = BFD_ALIGN (s->_raw_size,
1095 (bfd_size_type) (1 << power_of_two));
1096 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1097 {
1098 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1099 return FALSE;
1100 }
1101
1102 /* Define the symbol as being at this point in the section. */
1103 h->root.u.def.section = s;
1104 h->root.u.def.value = s->_raw_size;
1105
1106 /* Increment the section size to make room for the symbol. */
1107 s->_raw_size += h->size;
1108
1109 return TRUE;
1110 }
1111
1112 /* Set the sizes of the dynamic sections. */
1113
1114 static bfd_boolean
1115 elf_m68k_size_dynamic_sections (output_bfd, info)
1116 bfd *output_bfd ATTRIBUTE_UNUSED;
1117 struct bfd_link_info *info;
1118 {
1119 bfd *dynobj;
1120 asection *s;
1121 bfd_boolean plt;
1122 bfd_boolean relocs;
1123
1124 dynobj = elf_hash_table (info)->dynobj;
1125 BFD_ASSERT (dynobj != NULL);
1126
1127 if (elf_hash_table (info)->dynamic_sections_created)
1128 {
1129 /* Set the contents of the .interp section to the interpreter. */
1130 if (!info->shared)
1131 {
1132 s = bfd_get_section_by_name (dynobj, ".interp");
1133 BFD_ASSERT (s != NULL);
1134 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1135 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1136 }
1137 }
1138 else
1139 {
1140 /* We may have created entries in the .rela.got section.
1141 However, if we are not creating the dynamic sections, we will
1142 not actually use these entries. Reset the size of .rela.got,
1143 which will cause it to get stripped from the output file
1144 below. */
1145 s = bfd_get_section_by_name (dynobj, ".rela.got");
1146 if (s != NULL)
1147 s->_raw_size = 0;
1148 }
1149
1150 /* If this is a -Bsymbolic shared link, then we need to discard all
1151 PC relative relocs against symbols defined in a regular object.
1152 For the normal shared case we discard the PC relative relocs
1153 against symbols that have become local due to visibility changes.
1154 We allocated space for them in the check_relocs routine, but we
1155 will not fill them in in the relocate_section routine. */
1156 if (info->shared)
1157 elf_m68k_link_hash_traverse (elf_m68k_hash_table (info),
1158 elf_m68k_discard_copies,
1159 (PTR) info);
1160
1161 /* The check_relocs and adjust_dynamic_symbol entry points have
1162 determined the sizes of the various dynamic sections. Allocate
1163 memory for them. */
1164 plt = FALSE;
1165 relocs = FALSE;
1166 for (s = dynobj->sections; s != NULL; s = s->next)
1167 {
1168 const char *name;
1169 bfd_boolean strip;
1170
1171 if ((s->flags & SEC_LINKER_CREATED) == 0)
1172 continue;
1173
1174 /* It's OK to base decisions on the section name, because none
1175 of the dynobj section names depend upon the input files. */
1176 name = bfd_get_section_name (dynobj, s);
1177
1178 strip = FALSE;
1179
1180 if (strcmp (name, ".plt") == 0)
1181 {
1182 if (s->_raw_size == 0)
1183 {
1184 /* Strip this section if we don't need it; see the
1185 comment below. */
1186 strip = TRUE;
1187 }
1188 else
1189 {
1190 /* Remember whether there is a PLT. */
1191 plt = TRUE;
1192 }
1193 }
1194 else if (strncmp (name, ".rela", 5) == 0)
1195 {
1196 if (s->_raw_size == 0)
1197 {
1198 /* If we don't need this section, strip it from the
1199 output file. This is mostly to handle .rela.bss and
1200 .rela.plt. We must create both sections in
1201 create_dynamic_sections, because they must be created
1202 before the linker maps input sections to output
1203 sections. The linker does that before
1204 adjust_dynamic_symbol is called, and it is that
1205 function which decides whether anything needs to go
1206 into these sections. */
1207 strip = TRUE;
1208 }
1209 else
1210 {
1211 relocs = TRUE;
1212
1213 /* We use the reloc_count field as a counter if we need
1214 to copy relocs into the output file. */
1215 s->reloc_count = 0;
1216 }
1217 }
1218 else if (strncmp (name, ".got", 4) != 0)
1219 {
1220 /* It's not one of our sections, so don't allocate space. */
1221 continue;
1222 }
1223
1224 if (strip)
1225 {
1226 _bfd_strip_section_from_output (info, s);
1227 continue;
1228 }
1229
1230 /* Allocate memory for the section contents. */
1231 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1232 Unused entries should be reclaimed before the section's contents
1233 are written out, but at the moment this does not happen. Thus in
1234 order to prevent writing out garbage, we initialise the section's
1235 contents to zero. */
1236 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1237 if (s->contents == NULL && s->_raw_size != 0)
1238 return FALSE;
1239 }
1240
1241 if (elf_hash_table (info)->dynamic_sections_created)
1242 {
1243 /* Add some entries to the .dynamic section. We fill in the
1244 values later, in elf_m68k_finish_dynamic_sections, but we
1245 must add the entries now so that we get the correct size for
1246 the .dynamic section. The DT_DEBUG entry is filled in by the
1247 dynamic linker and used by the debugger. */
1248 #define add_dynamic_entry(TAG, VAL) \
1249 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1250
1251 if (!info->shared)
1252 {
1253 if (!add_dynamic_entry (DT_DEBUG, 0))
1254 return FALSE;
1255 }
1256
1257 if (plt)
1258 {
1259 if (!add_dynamic_entry (DT_PLTGOT, 0)
1260 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1261 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1262 || !add_dynamic_entry (DT_JMPREL, 0))
1263 return FALSE;
1264 }
1265
1266 if (relocs)
1267 {
1268 if (!add_dynamic_entry (DT_RELA, 0)
1269 || !add_dynamic_entry (DT_RELASZ, 0)
1270 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1271 return FALSE;
1272 }
1273
1274 if ((info->flags & DF_TEXTREL) != 0)
1275 {
1276 if (!add_dynamic_entry (DT_TEXTREL, 0))
1277 return FALSE;
1278 }
1279 }
1280 #undef add_dynamic_entry
1281
1282 return TRUE;
1283 }
1284
1285 /* This function is called via elf_m68k_link_hash_traverse if we are
1286 creating a shared object. In the -Bsymbolic case it discards the
1287 space allocated to copy PC relative relocs against symbols which
1288 are defined in regular objects. For the normal shared case, if
1289 discards space for pc-relative relocs that have become local due to
1290 symbol visibility changes. We allocated space for them in the
1291 check_relocs routine, but we won't fill them in in the
1292 relocate_section routine. */
1293
1294 static bfd_boolean
1295 elf_m68k_discard_copies (h, inf)
1296 struct elf_m68k_link_hash_entry *h;
1297 PTR inf;
1298 {
1299 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1300 struct elf_m68k_pcrel_relocs_copied *s;
1301
1302 if (h->root.root.type == bfd_link_hash_warning)
1303 h = (struct elf_m68k_link_hash_entry *) h->root.root.u.i.link;
1304
1305 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
1306 || (!info->symbolic
1307 && (h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0))
1308 return TRUE;
1309
1310 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1311 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1312
1313 return TRUE;
1314 }
1315
1316 /* Relocate an M68K ELF section. */
1317
1318 static bfd_boolean
1319 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1320 contents, relocs, local_syms, local_sections)
1321 bfd *output_bfd;
1322 struct bfd_link_info *info;
1323 bfd *input_bfd;
1324 asection *input_section;
1325 bfd_byte *contents;
1326 Elf_Internal_Rela *relocs;
1327 Elf_Internal_Sym *local_syms;
1328 asection **local_sections;
1329 {
1330 bfd *dynobj;
1331 Elf_Internal_Shdr *symtab_hdr;
1332 struct elf_link_hash_entry **sym_hashes;
1333 bfd_vma *local_got_offsets;
1334 asection *sgot;
1335 asection *splt;
1336 asection *sreloc;
1337 Elf_Internal_Rela *rel;
1338 Elf_Internal_Rela *relend;
1339
1340 if (info->relocateable)
1341 return TRUE;
1342
1343 dynobj = elf_hash_table (info)->dynobj;
1344 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1345 sym_hashes = elf_sym_hashes (input_bfd);
1346 local_got_offsets = elf_local_got_offsets (input_bfd);
1347
1348 sgot = NULL;
1349 splt = NULL;
1350 sreloc = NULL;
1351
1352 rel = relocs;
1353 relend = relocs + input_section->reloc_count;
1354 for (; rel < relend; rel++)
1355 {
1356 int r_type;
1357 reloc_howto_type *howto;
1358 unsigned long r_symndx;
1359 struct elf_link_hash_entry *h;
1360 Elf_Internal_Sym *sym;
1361 asection *sec;
1362 bfd_vma relocation;
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 if (r_symndx < symtab_hdr->sh_info)
1379 {
1380 sym = local_syms + r_symndx;
1381 sec = local_sections[r_symndx];
1382 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
1383 }
1384 else
1385 {
1386 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1387 while (h->root.type == bfd_link_hash_indirect
1388 || h->root.type == bfd_link_hash_warning)
1389 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1390 if (h->root.type == bfd_link_hash_defined
1391 || h->root.type == bfd_link_hash_defweak)
1392 {
1393 sec = h->root.u.def.section;
1394 if (((r_type == R_68K_PLT8
1395 || r_type == R_68K_PLT16
1396 || r_type == R_68K_PLT32
1397 || r_type == R_68K_PLT8O
1398 || r_type == R_68K_PLT16O
1399 || r_type == R_68K_PLT32O)
1400 && h->plt.offset != (bfd_vma) -1
1401 && elf_hash_table (info)->dynamic_sections_created)
1402 || ((r_type == R_68K_GOT8O
1403 || r_type == R_68K_GOT16O
1404 || r_type == R_68K_GOT32O
1405 || ((r_type == R_68K_GOT8
1406 || r_type == R_68K_GOT16
1407 || r_type == R_68K_GOT32)
1408 && strcmp (h->root.root.string,
1409 "_GLOBAL_OFFSET_TABLE_") != 0))
1410 && elf_hash_table (info)->dynamic_sections_created
1411 && (! info->shared
1412 || (! info->symbolic && h->dynindx != -1)
1413 || (h->elf_link_hash_flags
1414 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1415 || (info->shared
1416 && ((! info->symbolic && h->dynindx != -1)
1417 || (h->elf_link_hash_flags
1418 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1419 && ((input_section->flags & SEC_ALLOC) != 0
1420 /* DWARF will emit R_68K_32 relocations in its
1421 sections against symbols defined externally
1422 in shared libraries. We can't do anything
1423 with them here. */
1424 || ((input_section->flags & SEC_DEBUGGING) != 0
1425 && (h->elf_link_hash_flags
1426 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1427 && (r_type == R_68K_8
1428 || r_type == R_68K_16
1429 || r_type == R_68K_32
1430 || r_type == R_68K_PC8
1431 || r_type == R_68K_PC16
1432 || r_type == R_68K_PC32)))
1433 {
1434 /* In these cases, we don't need the relocation
1435 value. We check specially because in some
1436 obscure cases sec->output_section will be NULL. */
1437 relocation = 0;
1438 }
1439 else
1440 relocation = (h->root.u.def.value
1441 + sec->output_section->vma
1442 + sec->output_offset);
1443 }
1444 else if (h->root.type == bfd_link_hash_undefweak)
1445 relocation = 0;
1446 else if (info->shared
1447 && (!info->symbolic || info->allow_shlib_undefined)
1448 && !info->no_undefined
1449 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1450 relocation = 0;
1451 else
1452 {
1453 if (!(info->callbacks->undefined_symbol
1454 (info, h->root.root.string, input_bfd,
1455 input_section, rel->r_offset,
1456 (!info->shared || info->no_undefined
1457 || ELF_ST_VISIBILITY (h->other)))))
1458 return FALSE;
1459 relocation = 0;
1460 }
1461 }
1462
1463 switch (r_type)
1464 {
1465 case R_68K_GOT8:
1466 case R_68K_GOT16:
1467 case R_68K_GOT32:
1468 /* Relocation is to the address of the entry for this symbol
1469 in the global offset table. */
1470 if (h != NULL
1471 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1472 break;
1473 /* Fall through. */
1474 case R_68K_GOT8O:
1475 case R_68K_GOT16O:
1476 case R_68K_GOT32O:
1477 /* Relocation is the offset of the entry for this symbol in
1478 the global offset table. */
1479
1480 {
1481 bfd_vma off;
1482
1483 if (sgot == NULL)
1484 {
1485 sgot = bfd_get_section_by_name (dynobj, ".got");
1486 BFD_ASSERT (sgot != NULL);
1487 }
1488
1489 if (h != NULL)
1490 {
1491 off = h->got.offset;
1492 BFD_ASSERT (off != (bfd_vma) -1);
1493
1494 if (!elf_hash_table (info)->dynamic_sections_created
1495 || (info->shared
1496 && (info->symbolic || h->dynindx == -1)
1497 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1498 {
1499 /* This is actually a static link, or it is a
1500 -Bsymbolic link and the symbol is defined
1501 locally, or the symbol was forced to be local
1502 because of a version file.. We must initialize
1503 this entry in the global offset table. Since
1504 the offset must always be a multiple of 4, we
1505 use the least significant bit to record whether
1506 we have initialized it already.
1507
1508 When doing a dynamic link, we create a .rela.got
1509 relocation entry to initialize the value. This
1510 is done in the finish_dynamic_symbol routine. */
1511 if ((off & 1) != 0)
1512 off &= ~1;
1513 else
1514 {
1515 bfd_put_32 (output_bfd, relocation,
1516 sgot->contents + off);
1517 h->got.offset |= 1;
1518 }
1519 }
1520 }
1521 else
1522 {
1523 BFD_ASSERT (local_got_offsets != NULL
1524 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1525
1526 off = local_got_offsets[r_symndx];
1527
1528 /* The offset must always be a multiple of 4. We use
1529 the least significant bit to record whether we have
1530 already generated the necessary reloc. */
1531 if ((off & 1) != 0)
1532 off &= ~1;
1533 else
1534 {
1535 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1536
1537 if (info->shared)
1538 {
1539 asection *s;
1540 Elf_Internal_Rela outrel;
1541 bfd_byte *loc;
1542
1543 s = bfd_get_section_by_name (dynobj, ".rela.got");
1544 BFD_ASSERT (s != NULL);
1545
1546 outrel.r_offset = (sgot->output_section->vma
1547 + sgot->output_offset
1548 + off);
1549 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1550 outrel.r_addend = relocation;
1551 loc = s->contents;
1552 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1553 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1554 }
1555
1556 local_got_offsets[r_symndx] |= 1;
1557 }
1558 }
1559
1560 relocation = sgot->output_offset + off;
1561 if (r_type == R_68K_GOT8O
1562 || r_type == R_68K_GOT16O
1563 || r_type == R_68K_GOT32O)
1564 {
1565 /* This relocation does not use the addend. */
1566 rel->r_addend = 0;
1567 }
1568 else
1569 relocation += sgot->output_section->vma;
1570 }
1571 break;
1572
1573 case R_68K_PLT8:
1574 case R_68K_PLT16:
1575 case R_68K_PLT32:
1576 /* Relocation is to the entry for this symbol in the
1577 procedure linkage table. */
1578
1579 /* Resolve a PLTxx reloc against a local symbol directly,
1580 without using the procedure linkage table. */
1581 if (h == NULL)
1582 break;
1583
1584 if (h->plt.offset == (bfd_vma) -1
1585 || !elf_hash_table (info)->dynamic_sections_created)
1586 {
1587 /* We didn't make a PLT entry for this symbol. This
1588 happens when statically linking PIC code, or when
1589 using -Bsymbolic. */
1590 break;
1591 }
1592
1593 if (splt == NULL)
1594 {
1595 splt = bfd_get_section_by_name (dynobj, ".plt");
1596 BFD_ASSERT (splt != NULL);
1597 }
1598
1599 relocation = (splt->output_section->vma
1600 + splt->output_offset
1601 + h->plt.offset);
1602 break;
1603
1604 case R_68K_PLT8O:
1605 case R_68K_PLT16O:
1606 case R_68K_PLT32O:
1607 /* Relocation is the offset of the entry for this symbol in
1608 the procedure linkage table. */
1609 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1610
1611 if (splt == NULL)
1612 {
1613 splt = bfd_get_section_by_name (dynobj, ".plt");
1614 BFD_ASSERT (splt != NULL);
1615 }
1616
1617 relocation = h->plt.offset;
1618
1619 /* This relocation does not use the addend. */
1620 rel->r_addend = 0;
1621
1622 break;
1623
1624 case R_68K_PC8:
1625 case R_68K_PC16:
1626 case R_68K_PC32:
1627 if (h == NULL
1628 || (info->shared
1629 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1630 break;
1631 /* Fall through. */
1632 case R_68K_8:
1633 case R_68K_16:
1634 case R_68K_32:
1635 if (info->shared
1636 && r_symndx != 0
1637 && (input_section->flags & SEC_ALLOC) != 0
1638 && ((r_type != R_68K_PC8
1639 && r_type != R_68K_PC16
1640 && r_type != R_68K_PC32)
1641 || (!info->symbolic
1642 || (h->elf_link_hash_flags
1643 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1644 {
1645 Elf_Internal_Rela outrel;
1646 bfd_byte *loc;
1647 bfd_boolean skip, relocate;
1648
1649 /* When generating a shared object, these relocations
1650 are copied into the output file to be resolved at run
1651 time. */
1652
1653 if (sreloc == NULL)
1654 {
1655 const char *name;
1656
1657 name = (bfd_elf_string_from_elf_section
1658 (input_bfd,
1659 elf_elfheader (input_bfd)->e_shstrndx,
1660 elf_section_data (input_section)->rel_hdr.sh_name));
1661 if (name == NULL)
1662 return FALSE;
1663
1664 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1665 && strcmp (bfd_get_section_name (input_bfd,
1666 input_section),
1667 name + 5) == 0);
1668
1669 sreloc = bfd_get_section_by_name (dynobj, name);
1670 BFD_ASSERT (sreloc != NULL);
1671 }
1672
1673 skip = FALSE;
1674 relocate = FALSE;
1675
1676 outrel.r_offset =
1677 _bfd_elf_section_offset (output_bfd, info, input_section,
1678 rel->r_offset);
1679 if (outrel.r_offset == (bfd_vma) -1)
1680 skip = TRUE;
1681 else if (outrel.r_offset == (bfd_vma) -2)
1682 skip = TRUE, relocate = TRUE;
1683 outrel.r_offset += (input_section->output_section->vma
1684 + input_section->output_offset);
1685
1686 if (skip)
1687 memset (&outrel, 0, sizeof outrel);
1688 /* h->dynindx may be -1 if the symbol was marked to
1689 become local. */
1690 else if (h != NULL
1691 && ((! info->symbolic && h->dynindx != -1)
1692 || (h->elf_link_hash_flags
1693 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1694 {
1695 BFD_ASSERT (h->dynindx != -1);
1696 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1697 outrel.r_addend = relocation + rel->r_addend;
1698 }
1699 else
1700 {
1701 if (r_type == R_68K_32)
1702 {
1703 relocate = TRUE;
1704 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1705 outrel.r_addend = relocation + rel->r_addend;
1706 }
1707 else
1708 {
1709 long indx;
1710
1711 if (h == NULL)
1712 sec = local_sections[r_symndx];
1713 else
1714 {
1715 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1716 || (h->root.type
1717 == bfd_link_hash_defweak));
1718 sec = h->root.u.def.section;
1719 }
1720 if (sec != NULL && bfd_is_abs_section (sec))
1721 indx = 0;
1722 else if (sec == NULL || sec->owner == NULL)
1723 {
1724 bfd_set_error (bfd_error_bad_value);
1725 return FALSE;
1726 }
1727 else
1728 {
1729 asection *osec;
1730
1731 osec = sec->output_section;
1732 indx = elf_section_data (osec)->dynindx;
1733 BFD_ASSERT (indx > 0);
1734 }
1735
1736 outrel.r_info = ELF32_R_INFO (indx, r_type);
1737 outrel.r_addend = relocation + rel->r_addend;
1738 }
1739 }
1740
1741 loc = sreloc->contents;
1742 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1743 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1744
1745 /* This reloc will be computed at runtime, so there's no
1746 need to do anything now, except for R_68K_32
1747 relocations that have been turned into
1748 R_68K_RELATIVE. */
1749 if (!relocate)
1750 continue;
1751 }
1752
1753 break;
1754
1755 case R_68K_GNU_VTINHERIT:
1756 case R_68K_GNU_VTENTRY:
1757 /* These are no-ops in the end. */
1758 continue;
1759
1760 default:
1761 break;
1762 }
1763
1764 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1765 contents, rel->r_offset,
1766 relocation, rel->r_addend);
1767
1768 if (r != bfd_reloc_ok)
1769 {
1770 switch (r)
1771 {
1772 default:
1773 case bfd_reloc_outofrange:
1774 abort ();
1775 case bfd_reloc_overflow:
1776 {
1777 const char *name;
1778
1779 if (h != NULL)
1780 name = h->root.root.string;
1781 else
1782 {
1783 name = bfd_elf_string_from_elf_section (input_bfd,
1784 symtab_hdr->sh_link,
1785 sym->st_name);
1786 if (name == NULL)
1787 return FALSE;
1788 if (*name == '\0')
1789 name = bfd_section_name (input_bfd, sec);
1790 }
1791 if (!(info->callbacks->reloc_overflow
1792 (info, name, howto->name, (bfd_vma) 0,
1793 input_bfd, input_section, rel->r_offset)))
1794 return FALSE;
1795 }
1796 break;
1797 }
1798 }
1799 }
1800
1801 return TRUE;
1802 }
1803
1804 /* Finish up dynamic symbol handling. We set the contents of various
1805 dynamic sections here. */
1806
1807 static bfd_boolean
1808 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1809 bfd *output_bfd;
1810 struct bfd_link_info *info;
1811 struct elf_link_hash_entry *h;
1812 Elf_Internal_Sym *sym;
1813 {
1814 bfd *dynobj;
1815 int plt_off1, plt_off2, plt_off3;
1816
1817 dynobj = elf_hash_table (info)->dynobj;
1818
1819 if (h->plt.offset != (bfd_vma) -1)
1820 {
1821 asection *splt;
1822 asection *sgot;
1823 asection *srela;
1824 bfd_vma plt_index;
1825 bfd_vma got_offset;
1826 Elf_Internal_Rela rela;
1827 bfd_byte *loc;
1828
1829 /* This symbol has an entry in the procedure linkage table. Set
1830 it up. */
1831
1832 BFD_ASSERT (h->dynindx != -1);
1833
1834 splt = bfd_get_section_by_name (dynobj, ".plt");
1835 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1836 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1837 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1838
1839 /* Get the index in the procedure linkage table which
1840 corresponds to this symbol. This is the index of this symbol
1841 in all the symbols for which we are making plt entries. The
1842 first entry in the procedure linkage table is reserved. */
1843 if ( CPU32_FLAG (output_bfd))
1844 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1845 else
1846 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1847
1848 /* Get the offset into the .got table of the entry that
1849 corresponds to this function. Each .got entry is 4 bytes.
1850 The first three are reserved. */
1851 got_offset = (plt_index + 3) * 4;
1852
1853 if ( CPU32_FLAG (output_bfd))
1854 {
1855 /* Fill in the entry in the procedure linkage table. */
1856 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1857 PLT_CPU32_ENTRY_SIZE);
1858 plt_off1 = 4;
1859 plt_off2 = 12;
1860 plt_off3 = 18;
1861 }
1862 else
1863 {
1864 /* Fill in the entry in the procedure linkage table. */
1865 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1866 PLT_ENTRY_SIZE);
1867 plt_off1 = 4;
1868 plt_off2 = 10;
1869 plt_off3 = 16;
1870 }
1871
1872 /* The offset is relative to the first extension word. */
1873 bfd_put_32 (output_bfd,
1874 (sgot->output_section->vma
1875 + sgot->output_offset
1876 + got_offset
1877 - (splt->output_section->vma
1878 + h->plt.offset + 2)),
1879 splt->contents + h->plt.offset + plt_off1);
1880
1881 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1882 splt->contents + h->plt.offset + plt_off2);
1883 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1884 splt->contents + h->plt.offset + plt_off3);
1885
1886 /* Fill in the entry in the global offset table. */
1887 bfd_put_32 (output_bfd,
1888 (splt->output_section->vma
1889 + splt->output_offset
1890 + h->plt.offset
1891 + 8),
1892 sgot->contents + got_offset);
1893
1894 /* Fill in the entry in the .rela.plt section. */
1895 rela.r_offset = (sgot->output_section->vma
1896 + sgot->output_offset
1897 + got_offset);
1898 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1899 rela.r_addend = 0;
1900 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1901 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1902
1903 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1904 {
1905 /* Mark the symbol as undefined, rather than as defined in
1906 the .plt section. Leave the value alone. */
1907 sym->st_shndx = SHN_UNDEF;
1908 }
1909 }
1910
1911 if (h->got.offset != (bfd_vma) -1)
1912 {
1913 asection *sgot;
1914 asection *srela;
1915 Elf_Internal_Rela rela;
1916 bfd_byte *loc;
1917
1918 /* This symbol has an entry in the global offset table. Set it
1919 up. */
1920
1921 sgot = bfd_get_section_by_name (dynobj, ".got");
1922 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1923 BFD_ASSERT (sgot != NULL && srela != NULL);
1924
1925 rela.r_offset = (sgot->output_section->vma
1926 + sgot->output_offset
1927 + (h->got.offset &~ (bfd_vma) 1));
1928
1929 /* If this is a -Bsymbolic link, and the symbol is defined
1930 locally, we just want to emit a RELATIVE reloc. Likewise if
1931 the symbol was forced to be local because of a version file.
1932 The entry in the global offset table will already have been
1933 initialized in the relocate_section function. */
1934 if (info->shared
1935 && (info->symbolic || h->dynindx == -1)
1936 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1937 {
1938 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1939 rela.r_addend = bfd_get_signed_32 (output_bfd,
1940 (sgot->contents
1941 + (h->got.offset &~ (bfd_vma) 1)));
1942 }
1943 else
1944 {
1945 bfd_put_32 (output_bfd, (bfd_vma) 0,
1946 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1947 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1948 rela.r_addend = 0;
1949 }
1950
1951 loc = srela->contents;
1952 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1953 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1954 }
1955
1956 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1957 {
1958 asection *s;
1959 Elf_Internal_Rela rela;
1960 bfd_byte *loc;
1961
1962 /* This symbol needs a copy reloc. Set it up. */
1963
1964 BFD_ASSERT (h->dynindx != -1
1965 && (h->root.type == bfd_link_hash_defined
1966 || h->root.type == bfd_link_hash_defweak));
1967
1968 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1969 ".rela.bss");
1970 BFD_ASSERT (s != NULL);
1971
1972 rela.r_offset = (h->root.u.def.value
1973 + h->root.u.def.section->output_section->vma
1974 + h->root.u.def.section->output_offset);
1975 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1976 rela.r_addend = 0;
1977 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1978 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1979 }
1980
1981 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1982 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1983 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1984 sym->st_shndx = SHN_ABS;
1985
1986 return TRUE;
1987 }
1988
1989 /* Finish up the dynamic sections. */
1990
1991 static bfd_boolean
1992 elf_m68k_finish_dynamic_sections (output_bfd, info)
1993 bfd *output_bfd;
1994 struct bfd_link_info *info;
1995 {
1996 bfd *dynobj;
1997 asection *sgot;
1998 asection *sdyn;
1999
2000 dynobj = elf_hash_table (info)->dynobj;
2001
2002 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2003 BFD_ASSERT (sgot != NULL);
2004 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2005
2006 if (elf_hash_table (info)->dynamic_sections_created)
2007 {
2008 asection *splt;
2009 Elf32_External_Dyn *dyncon, *dynconend;
2010
2011 splt = bfd_get_section_by_name (dynobj, ".plt");
2012 BFD_ASSERT (splt != NULL && sdyn != NULL);
2013
2014 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2015 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2016 for (; dyncon < dynconend; dyncon++)
2017 {
2018 Elf_Internal_Dyn dyn;
2019 const char *name;
2020 asection *s;
2021
2022 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2023
2024 switch (dyn.d_tag)
2025 {
2026 default:
2027 break;
2028
2029 case DT_PLTGOT:
2030 name = ".got";
2031 goto get_vma;
2032 case DT_JMPREL:
2033 name = ".rela.plt";
2034 get_vma:
2035 s = bfd_get_section_by_name (output_bfd, name);
2036 BFD_ASSERT (s != NULL);
2037 dyn.d_un.d_ptr = s->vma;
2038 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2039 break;
2040
2041 case DT_PLTRELSZ:
2042 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2043 BFD_ASSERT (s != NULL);
2044 if (s->_cooked_size != 0)
2045 dyn.d_un.d_val = s->_cooked_size;
2046 else
2047 dyn.d_un.d_val = s->_raw_size;
2048 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2049 break;
2050
2051 case DT_RELASZ:
2052 /* The procedure linkage table relocs (DT_JMPREL) should
2053 not be included in the overall relocs (DT_RELA).
2054 Therefore, we override the DT_RELASZ entry here to
2055 make it not include the JMPREL relocs. Since the
2056 linker script arranges for .rela.plt to follow all
2057 other relocation sections, we don't have to worry
2058 about changing the DT_RELA entry. */
2059 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2060 if (s != NULL)
2061 {
2062 if (s->_cooked_size != 0)
2063 dyn.d_un.d_val -= s->_cooked_size;
2064 else
2065 dyn.d_un.d_val -= s->_raw_size;
2066 }
2067 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2068 break;
2069 }
2070 }
2071
2072 /* Fill in the first entry in the procedure linkage table. */
2073 if (splt->_raw_size > 0)
2074 {
2075 if (!CPU32_FLAG (output_bfd))
2076 {
2077 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2078 bfd_put_32 (output_bfd,
2079 (sgot->output_section->vma
2080 + sgot->output_offset + 4
2081 - (splt->output_section->vma + 2)),
2082 splt->contents + 4);
2083 bfd_put_32 (output_bfd,
2084 (sgot->output_section->vma
2085 + sgot->output_offset + 8
2086 - (splt->output_section->vma + 10)),
2087 splt->contents + 12);
2088 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2089 = PLT_ENTRY_SIZE;
2090 }
2091 else /* cpu32 */
2092 {
2093 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2094 bfd_put_32 (output_bfd,
2095 (sgot->output_section->vma
2096 + sgot->output_offset + 4
2097 - (splt->output_section->vma + 2)),
2098 splt->contents + 4);
2099 bfd_put_32 (output_bfd,
2100 (sgot->output_section->vma
2101 + sgot->output_offset + 8
2102 - (splt->output_section->vma + 10)),
2103 splt->contents + 12);
2104 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2105 = PLT_CPU32_ENTRY_SIZE;
2106 }
2107 }
2108 }
2109
2110 /* Fill in the first three entries in the global offset table. */
2111 if (sgot->_raw_size > 0)
2112 {
2113 if (sdyn == NULL)
2114 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2115 else
2116 bfd_put_32 (output_bfd,
2117 sdyn->output_section->vma + sdyn->output_offset,
2118 sgot->contents);
2119 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2120 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2121 }
2122
2123 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2124
2125 return TRUE;
2126 }
2127
2128 /* Given a .data section and a .emreloc in-memory section, store
2129 relocation information into the .emreloc section which can be
2130 used at runtime to relocate the section. This is called by the
2131 linker when the --embedded-relocs switch is used. This is called
2132 after the add_symbols entry point has been called for all the
2133 objects, and before the final_link entry point is called. */
2134
2135 bfd_boolean
2136 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2137 bfd *abfd;
2138 struct bfd_link_info *info;
2139 asection *datasec;
2140 asection *relsec;
2141 char **errmsg;
2142 {
2143 Elf_Internal_Shdr *symtab_hdr;
2144 Elf_Internal_Sym *isymbuf = NULL;
2145 Elf_Internal_Rela *internal_relocs = NULL;
2146 Elf_Internal_Rela *irel, *irelend;
2147 bfd_byte *p;
2148 bfd_size_type amt;
2149
2150 BFD_ASSERT (! info->relocateable);
2151
2152 *errmsg = NULL;
2153
2154 if (datasec->reloc_count == 0)
2155 return TRUE;
2156
2157 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2158
2159 /* Get a copy of the native relocations. */
2160 internal_relocs = (_bfd_elf32_link_read_relocs
2161 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2162 info->keep_memory));
2163 if (internal_relocs == NULL)
2164 goto error_return;
2165
2166 amt = (bfd_size_type) datasec->reloc_count * 12;
2167 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2168 if (relsec->contents == NULL)
2169 goto error_return;
2170
2171 p = relsec->contents;
2172
2173 irelend = internal_relocs + datasec->reloc_count;
2174 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2175 {
2176 asection *targetsec;
2177
2178 /* We are going to write a four byte longword into the runtime
2179 reloc section. The longword will be the address in the data
2180 section which must be relocated. It is followed by the name
2181 of the target section NUL-padded or truncated to 8
2182 characters. */
2183
2184 /* We can only relocate absolute longword relocs at run time. */
2185 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2186 {
2187 *errmsg = _("unsupported reloc type");
2188 bfd_set_error (bfd_error_bad_value);
2189 goto error_return;
2190 }
2191
2192 /* Get the target section referred to by the reloc. */
2193 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2194 {
2195 /* A local symbol. */
2196 Elf_Internal_Sym *isym;
2197
2198 /* Read this BFD's local symbols if we haven't done so already. */
2199 if (isymbuf == NULL)
2200 {
2201 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2202 if (isymbuf == NULL)
2203 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2204 symtab_hdr->sh_info, 0,
2205 NULL, NULL, NULL);
2206 if (isymbuf == NULL)
2207 goto error_return;
2208 }
2209
2210 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2211 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2212 }
2213 else
2214 {
2215 unsigned long indx;
2216 struct elf_link_hash_entry *h;
2217
2218 /* An external symbol. */
2219 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2220 h = elf_sym_hashes (abfd)[indx];
2221 BFD_ASSERT (h != NULL);
2222 if (h->root.type == bfd_link_hash_defined
2223 || h->root.type == bfd_link_hash_defweak)
2224 targetsec = h->root.u.def.section;
2225 else
2226 targetsec = NULL;
2227 }
2228
2229 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2230 memset (p + 4, 0, 8);
2231 if (targetsec != NULL)
2232 strncpy (p + 4, targetsec->output_section->name, 8);
2233 }
2234
2235 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2236 free (isymbuf);
2237 if (internal_relocs != NULL
2238 && elf_section_data (datasec)->relocs != internal_relocs)
2239 free (internal_relocs);
2240 return TRUE;
2241
2242 error_return:
2243 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2244 free (isymbuf);
2245 if (internal_relocs != NULL
2246 && elf_section_data (datasec)->relocs != internal_relocs)
2247 free (internal_relocs);
2248 return FALSE;
2249 }
2250
2251 static enum elf_reloc_type_class
2252 elf32_m68k_reloc_type_class (rela)
2253 const Elf_Internal_Rela *rela;
2254 {
2255 switch ((int) ELF32_R_TYPE (rela->r_info))
2256 {
2257 case R_68K_RELATIVE:
2258 return reloc_class_relative;
2259 case R_68K_JMP_SLOT:
2260 return reloc_class_plt;
2261 case R_68K_COPY:
2262 return reloc_class_copy;
2263 default:
2264 return reloc_class_normal;
2265 }
2266 }
2267
2268 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2269 #define TARGET_BIG_NAME "elf32-m68k"
2270 #define ELF_MACHINE_CODE EM_68K
2271 #define ELF_MAXPAGESIZE 0x2000
2272 #define elf_backend_create_dynamic_sections \
2273 _bfd_elf_create_dynamic_sections
2274 #define bfd_elf32_bfd_link_hash_table_create \
2275 elf_m68k_link_hash_table_create
2276 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2277
2278 #define elf_backend_check_relocs elf_m68k_check_relocs
2279 #define elf_backend_adjust_dynamic_symbol \
2280 elf_m68k_adjust_dynamic_symbol
2281 #define elf_backend_size_dynamic_sections \
2282 elf_m68k_size_dynamic_sections
2283 #define elf_backend_relocate_section elf_m68k_relocate_section
2284 #define elf_backend_finish_dynamic_symbol \
2285 elf_m68k_finish_dynamic_symbol
2286 #define elf_backend_finish_dynamic_sections \
2287 elf_m68k_finish_dynamic_sections
2288 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2289 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2290 #define bfd_elf32_bfd_merge_private_bfd_data \
2291 elf32_m68k_merge_private_bfd_data
2292 #define bfd_elf32_bfd_set_private_flags \
2293 elf32_m68k_set_private_flags
2294 #define bfd_elf32_bfd_print_private_bfd_data \
2295 elf32_m68k_print_private_bfd_data
2296 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2297
2298 #define elf_backend_can_gc_sections 1
2299 #define elf_backend_can_refcount 1
2300 #define elf_backend_want_got_plt 1
2301 #define elf_backend_plt_readonly 1
2302 #define elf_backend_want_plt_sym 0
2303 #define elf_backend_got_header_size 12
2304 #define elf_backend_rela_normal 1
2305
2306 #include "elf32-target.h"
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