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* i386-dis.c: Change formatting conventions for architecture
[binutils.git] / bfd / elf32-m68k.c
bloba3df85d5b5944e7b9e9e7b4490e9e902c1161a76
1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001
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 *, Elf32_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 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 ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
41 struct elf_link_hash_entry *, Elf_Internal_Sym *));
42 static boolean elf_m68k_gc_sweep_hook
43 PARAMS ((bfd *, struct bfd_link_info *, asection *,
44 const Elf_Internal_Rela *));
45 static boolean elf_m68k_adjust_dynamic_symbol
46 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
47 static boolean elf_m68k_size_dynamic_sections
48 PARAMS ((bfd *, struct bfd_link_info *));
49 static 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 boolean elf_m68k_finish_dynamic_symbol
53 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
54 Elf_Internal_Sym *));
55 static boolean elf_m68k_finish_dynamic_sections
56 PARAMS ((bfd *, struct bfd_link_info *));
57
58 static boolean elf32_m68k_set_private_flags
59 PARAMS ((bfd *, flagword));
60 static boolean elf32_m68k_copy_private_bfd_data
61 PARAMS ((bfd *, bfd *));
62 static boolean elf32_m68k_merge_private_bfd_data
63 PARAMS ((bfd *, bfd *));
64 static boolean elf32_m68k_print_private_bfd_data
65 PARAMS ((bfd *, PTR));
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
184 #define USE_RELA
185 \f
186 /* Functions for the m68k ELF linker. */
187
188 /* The name of the dynamic interpreter. This is put in the .interp
189 section. */
190
191 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
192
193 /* The size in bytes of an entry in the procedure linkage table. */
194
195 #define PLT_ENTRY_SIZE 20
196
197 /* The first entry in a procedure linkage table looks like this. See
198 the SVR4 ABI m68k supplement to see how this works. */
199
200 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
201 {
202 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
203 0, 0, 0, 0, /* replaced with offset to .got + 4. */
204 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
205 0, 0, 0, 0, /* replaced with offset to .got + 8. */
206 0, 0, 0, 0 /* pad out to 20 bytes. */
207 };
208
209 /* Subsequent entries in a procedure linkage table look like this. */
210
211 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
212 {
213 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
214 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
215 0x2f, 0x3c, /* move.l #offset,-(%sp) */
216 0, 0, 0, 0, /* replaced with offset into relocation table. */
217 0x60, 0xff, /* bra.l .plt */
218 0, 0, 0, 0 /* replaced with offset to start of .plt. */
219 };
220
221 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
222
223 #define PLT_CPU32_ENTRY_SIZE 24
224 /* Procedure linkage table entries for the cpu32 */
225 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
226 {
227 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
228 0, 0, 0, 0, /* replaced with offset to .got + 4. */
229 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
230 0, 0, 0, 0, /* replace with offset to .got +8. */
231 0x4e, 0xd1, /* jmp %a1@ */
232 0, 0, 0, 0, /* pad out to 24 bytes. */
233 0, 0
234 };
235
236 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
237 {
238 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
239 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
240 0x4e, 0xd1, /* jmp %a1@ */
241 0x2f, 0x3c, /* move.l #offset,-(%sp) */
242 0, 0, 0, 0, /* replaced with offset into relocation table. */
243 0x60, 0xff, /* bra.l .plt */
244 0, 0, 0, 0, /* replaced with offset to start of .plt. */
245 0, 0
246 };
247
248 /* The m68k linker needs to keep track of the number of relocs that it
249 decides to copy in check_relocs for each symbol. This is so that it
250 can discard PC relative relocs if it doesn't need them when linking
251 with -Bsymbolic. We store the information in a field extending the
252 regular ELF linker hash table. */
253
254 /* This structure keeps track of the number of PC relative relocs we have
255 copied for a given symbol. */
256
257 struct elf_m68k_pcrel_relocs_copied
258 {
259 /* Next section. */
260 struct elf_m68k_pcrel_relocs_copied *next;
261 /* A section in dynobj. */
262 asection *section;
263 /* Number of relocs copied in this section. */
264 bfd_size_type count;
265 };
266
267 /* m68k ELF linker hash entry. */
268
269 struct elf_m68k_link_hash_entry
270 {
271 struct elf_link_hash_entry root;
272
273 /* Number of PC relative relocs copied for this symbol. */
274 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
275 };
276
277 /* m68k ELF linker hash table. */
278
279 struct elf_m68k_link_hash_table
280 {
281 struct elf_link_hash_table root;
282 };
283
284 /* Declare this now that the above structures are defined. */
285
286 static boolean elf_m68k_discard_copies
287 PARAMS ((struct elf_m68k_link_hash_entry *, PTR));
288
289 /* Traverse an m68k ELF linker hash table. */
290
291 #define elf_m68k_link_hash_traverse(table, func, info) \
292 (elf_link_hash_traverse \
293 (&(table)->root, \
294 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
295 (info)))
296
297 /* Get the m68k ELF linker hash table from a link_info structure. */
298
299 #define elf_m68k_hash_table(p) \
300 ((struct elf_m68k_link_hash_table *) (p)->hash)
301
302 /* Create an entry in an m68k ELF linker hash table. */
303
304 static struct bfd_hash_entry *
305 elf_m68k_link_hash_newfunc (entry, table, string)
306 struct bfd_hash_entry *entry;
307 struct bfd_hash_table *table;
308 const char *string;
309 {
310 struct elf_m68k_link_hash_entry *ret =
311 (struct elf_m68k_link_hash_entry *) entry;
312
313 /* Allocate the structure if it has not already been allocated by a
314 subclass. */
315 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
316 ret = ((struct elf_m68k_link_hash_entry *)
317 bfd_hash_allocate (table,
318 sizeof (struct elf_m68k_link_hash_entry)));
319 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
320 return (struct bfd_hash_entry *) ret;
321
322 /* Call the allocation method of the superclass. */
323 ret = ((struct elf_m68k_link_hash_entry *)
324 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
325 table, string));
326 if (ret != (struct elf_m68k_link_hash_entry *) NULL)
327 {
328 ret->pcrel_relocs_copied = NULL;
329 }
330
331 return (struct bfd_hash_entry *) ret;
332 }
333
334 /* Create an m68k ELF linker hash table. */
335
336 static struct bfd_link_hash_table *
337 elf_m68k_link_hash_table_create (abfd)
338 bfd *abfd;
339 {
340 struct elf_m68k_link_hash_table *ret;
341
342 ret = ((struct elf_m68k_link_hash_table *)
343 bfd_alloc (abfd, sizeof (struct elf_m68k_link_hash_table)));
344 if (ret == (struct elf_m68k_link_hash_table *) NULL)
345 return NULL;
346
347 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
348 elf_m68k_link_hash_newfunc))
349 {
350 bfd_release (abfd, ret);
351 return NULL;
352 }
353
354 return &ret->root.root;
355 }
356
357 /* Keep m68k-specific flags in the ELF header */
358 static boolean
359 elf32_m68k_set_private_flags (abfd, flags)
360 bfd *abfd;
361 flagword flags;
362 {
363 elf_elfheader (abfd)->e_flags = flags;
364 elf_flags_init (abfd) = true;
365 return true;
366 }
367
368 /* Copy m68k-specific data from one module to another */
369 static boolean
370 elf32_m68k_copy_private_bfd_data (ibfd, obfd)
371 bfd *ibfd;
372 bfd *obfd;
373 {
374 flagword in_flags;
375
376 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
377 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
378 return true;
379
380 in_flags = elf_elfheader (ibfd)->e_flags;
381
382 elf_elfheader (obfd)->e_flags = in_flags;
383 elf_flags_init (obfd) = true;
384
385 return true;
386 }
387
388 /* Merge backend specific data from an object file to the output
389 object file when linking. */
390 static boolean
391 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
392 bfd *ibfd;
393 bfd *obfd;
394 {
395 flagword out_flags;
396 flagword in_flags;
397
398 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
399 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
400 return true;
401
402 in_flags = elf_elfheader (ibfd)->e_flags;
403 out_flags = elf_elfheader (obfd)->e_flags;
404
405 if (!elf_flags_init (obfd))
406 {
407 elf_flags_init (obfd) = true;
408 elf_elfheader (obfd)->e_flags = in_flags;
409 }
410
411 return true;
412 }
413
414 /* Display the flags field */
415 static boolean
416 elf32_m68k_print_private_bfd_data (abfd, ptr)
417 bfd *abfd;
418 PTR ptr;
419 {
420 FILE *file = (FILE *) ptr;
421
422 BFD_ASSERT (abfd != NULL && ptr != NULL);
423
424 /* Print normal ELF private data. */
425 _bfd_elf_print_private_bfd_data (abfd, ptr);
426
427 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
428
429 /* xgettext:c-format */
430 fprintf (file, _ ("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
431
432 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
433 fprintf (file, _ (" [cpu32]"));
434
435 fputc ('\n', file);
436
437 return true;
438 }
439 /* Look through the relocs for a section during the first phase, and
440 allocate space in the global offset table or procedure linkage
441 table. */
442
443 static boolean
444 elf_m68k_check_relocs (abfd, info, sec, relocs)
445 bfd *abfd;
446 struct bfd_link_info *info;
447 asection *sec;
448 const Elf_Internal_Rela *relocs;
449 {
450 bfd *dynobj;
451 Elf_Internal_Shdr *symtab_hdr;
452 struct elf_link_hash_entry **sym_hashes;
453 bfd_signed_vma *local_got_refcounts;
454 const Elf_Internal_Rela *rel;
455 const Elf_Internal_Rela *rel_end;
456 asection *sgot;
457 asection *srelgot;
458 asection *sreloc;
459
460 if (info->relocateable)
461 return true;
462
463 dynobj = elf_hash_table (info)->dynobj;
464 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
465 sym_hashes = elf_sym_hashes (abfd);
466 local_got_refcounts = elf_local_got_refcounts (abfd);
467
468 sgot = NULL;
469 srelgot = NULL;
470 sreloc = NULL;
471
472 rel_end = relocs + sec->reloc_count;
473 for (rel = relocs; rel < rel_end; rel++)
474 {
475 unsigned long r_symndx;
476 struct elf_link_hash_entry *h;
477
478 r_symndx = ELF32_R_SYM (rel->r_info);
479
480 if (r_symndx < symtab_hdr->sh_info)
481 h = NULL;
482 else
483 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
484
485 switch (ELF32_R_TYPE (rel->r_info))
486 {
487 case R_68K_GOT8:
488 case R_68K_GOT16:
489 case R_68K_GOT32:
490 if (h != NULL
491 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
492 break;
493 /* Fall through. */
494 case R_68K_GOT8O:
495 case R_68K_GOT16O:
496 case R_68K_GOT32O:
497 /* This symbol requires a global offset table entry. */
498
499 if (dynobj == NULL)
500 {
501 /* Create the .got section. */
502 elf_hash_table (info)->dynobj = dynobj = abfd;
503 if (!_bfd_elf_create_got_section (dynobj, info))
504 return false;
505 }
506
507 if (sgot == NULL)
508 {
509 sgot = bfd_get_section_by_name (dynobj, ".got");
510 BFD_ASSERT (sgot != NULL);
511 }
512
513 if (srelgot == NULL
514 && (h != NULL || info->shared))
515 {
516 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
517 if (srelgot == NULL)
518 {
519 srelgot = bfd_make_section (dynobj, ".rela.got");
520 if (srelgot == NULL
521 || !bfd_set_section_flags (dynobj, srelgot,
522 (SEC_ALLOC
523 | SEC_LOAD
524 | SEC_HAS_CONTENTS
525 | SEC_IN_MEMORY
526 | SEC_LINKER_CREATED
527 | SEC_READONLY))
528 || !bfd_set_section_alignment (dynobj, srelgot, 2))
529 return false;
530 }
531 }
532
533 if (h != NULL)
534 {
535 if (h->got.refcount == -1)
536 {
537 h->got.refcount = 1;
538
539 /* Make sure this symbol is output as a dynamic symbol. */
540 if (h->dynindx == -1)
541 {
542 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
543 return false;
544 }
545
546 /* Allocate space in the .got section. */
547 sgot->_raw_size += 4;
548 /* Allocate relocation space. */
549 srelgot->_raw_size += sizeof (Elf32_External_Rela);
550 }
551 else
552 h->got.refcount++;
553 }
554 else
555 {
556 /* This is a global offset table entry for a local symbol. */
557 if (local_got_refcounts == NULL)
558 {
559 size_t size;
560
561 size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
562 local_got_refcounts = ((bfd_signed_vma *)
563 bfd_alloc (abfd, size));
564 if (local_got_refcounts == NULL)
565 return false;
566 elf_local_got_refcounts (abfd) = local_got_refcounts;
567 memset (local_got_refcounts, -1, size);
568 }
569 if (local_got_refcounts[r_symndx] == -1)
570 {
571 local_got_refcounts[r_symndx] = 1;
572
573 sgot->_raw_size += 4;
574 if (info->shared)
575 {
576 /* If we are generating a shared object, we need to
577 output a R_68K_RELATIVE reloc so that the dynamic
578 linker can adjust this GOT entry. */
579 srelgot->_raw_size += sizeof (Elf32_External_Rela);
580 }
581 }
582 else
583 local_got_refcounts[r_symndx]++;
584 }
585 break;
586
587 case R_68K_PLT8:
588 case R_68K_PLT16:
589 case R_68K_PLT32:
590 /* This symbol requires a procedure linkage table entry. We
591 actually build the entry in adjust_dynamic_symbol,
592 because this might be a case of linking PIC code which is
593 never referenced by a dynamic object, in which case we
594 don't need to generate a procedure linkage table entry
595 after all. */
596
597 /* If this is a local symbol, we resolve it directly without
598 creating a procedure linkage table entry. */
599 if (h == NULL)
600 continue;
601
602 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
603 if (h->plt.refcount == -1)
604 h->plt.refcount = 1;
605 else
606 h->plt.refcount++;
607 break;
608
609 case R_68K_PLT8O:
610 case R_68K_PLT16O:
611 case R_68K_PLT32O:
612 /* This symbol requires a procedure linkage table entry. */
613
614 if (h == NULL)
615 {
616 /* It does not make sense to have this relocation for a
617 local symbol. FIXME: does it? How to handle it if
618 it does make sense? */
619 bfd_set_error (bfd_error_bad_value);
620 return false;
621 }
622
623 /* Make sure this symbol is output as a dynamic symbol. */
624 if (h->dynindx == -1)
625 {
626 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
627 return false;
628 }
629
630 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
631 if (h->plt.refcount == -1)
632 h->plt.refcount = 1;
633 else
634 h->plt.refcount++;
635 break;
636
637 case R_68K_PC8:
638 case R_68K_PC16:
639 case R_68K_PC32:
640 /* If we are creating a shared library and this is not a local
641 symbol, we need to copy the reloc into the shared library.
642 However when linking with -Bsymbolic and this is a global
643 symbol which is defined in an object we are including in the
644 link (i.e., DEF_REGULAR is set), then we can resolve the
645 reloc directly. At this point we have not seen all the input
646 files, so it is possible that DEF_REGULAR is not set now but
647 will be set later (it is never cleared). We account for that
648 possibility below by storing information in the
649 pcrel_relocs_copied field of the hash table entry. */
650 if (!(info->shared
651 && (sec->flags & SEC_ALLOC) != 0
652 && h != NULL
653 && (!info->symbolic
654 || (h->elf_link_hash_flags
655 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
656 {
657 if (h != NULL)
658 {
659 /* Make sure a plt entry is created for this symbol if
660 it turns out to be a function defined by a dynamic
661 object. */
662 if (h->plt.refcount == -1)
663 h->plt.refcount = 1;
664 else
665 h->plt.refcount++;
666 }
667 break;
668 }
669 /* Fall through. */
670 case R_68K_8:
671 case R_68K_16:
672 case R_68K_32:
673 if (h != NULL)
674 {
675 /* Make sure a plt entry is created for this symbol if it
676 turns out to be a function defined by a dynamic object. */
677 if (h->plt.refcount == -1)
678 h->plt.refcount = 1;
679 else
680 h->plt.refcount++;
681 }
682
683 /* If we are creating a shared library, we need to copy the
684 reloc into the shared library. */
685 if (info->shared
686 && (sec->flags & SEC_ALLOC) != 0)
687 {
688 /* When creating a shared object, we must copy these
689 reloc types into the output file. We create a reloc
690 section in dynobj and make room for this reloc. */
691 if (sreloc == NULL)
692 {
693 const char *name;
694
695 name = (bfd_elf_string_from_elf_section
696 (abfd,
697 elf_elfheader (abfd)->e_shstrndx,
698 elf_section_data (sec)->rel_hdr.sh_name));
699 if (name == NULL)
700 return false;
701
702 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
703 && strcmp (bfd_get_section_name (abfd, sec),
704 name + 5) == 0);
705
706 sreloc = bfd_get_section_by_name (dynobj, name);
707 if (sreloc == NULL)
708 {
709 sreloc = bfd_make_section (dynobj, name);
710 if (sreloc == NULL
711 || !bfd_set_section_flags (dynobj, sreloc,
712 (SEC_ALLOC
713 | SEC_LOAD
714 | SEC_HAS_CONTENTS
715 | SEC_IN_MEMORY
716 | SEC_LINKER_CREATED
717 | SEC_READONLY))
718 || !bfd_set_section_alignment (dynobj, sreloc, 2))
719 return false;
720 }
721 }
722
723 sreloc->_raw_size += sizeof (Elf32_External_Rela);
724
725 /* If we are linking with -Bsymbolic, we count the number of
726 PC relative relocations we have entered for this symbol,
727 so that we can discard them again if the symbol is later
728 defined by a regular object. Note that this function is
729 only called if we are using an m68kelf linker hash table,
730 which means that h is really a pointer to an
731 elf_m68k_link_hash_entry. */
732 if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8
733 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
734 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
735 && info->symbolic)
736 {
737 struct elf_m68k_link_hash_entry *eh;
738 struct elf_m68k_pcrel_relocs_copied *p;
739
740 eh = (struct elf_m68k_link_hash_entry *) h;
741
742 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
743 if (p->section == sreloc)
744 break;
745
746 if (p == NULL)
747 {
748 p = ((struct elf_m68k_pcrel_relocs_copied *)
749 bfd_alloc (dynobj, sizeof *p));
750 if (p == NULL)
751 return false;
752 p->next = eh->pcrel_relocs_copied;
753 eh->pcrel_relocs_copied = p;
754 p->section = sreloc;
755 p->count = 0;
756 }
757
758 ++p->count;
759 }
760 }
761
762 break;
763
764 /* This relocation describes the C++ object vtable hierarchy.
765 Reconstruct it for later use during GC. */
766 case R_68K_GNU_VTINHERIT:
767 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
768 return false;
769 break;
770
771 /* This relocation describes which C++ vtable entries are actually
772 used. Record for later use during GC. */
773 case R_68K_GNU_VTENTRY:
774 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
775 return false;
776 break;
777
778 default:
779 break;
780 }
781 }
782
783 return true;
784 }
785
786 /* Return the section that should be marked against GC for a given
787 relocation. */
788
789 static asection *
790 elf_m68k_gc_mark_hook (abfd, info, rel, h, sym)
791 bfd *abfd;
792 struct bfd_link_info *info ATTRIBUTE_UNUSED;
793 Elf_Internal_Rela *rel;
794 struct elf_link_hash_entry *h;
795 Elf_Internal_Sym *sym;
796 {
797 if (h != NULL)
798 {
799 switch (ELF32_R_TYPE (rel->r_info))
800 {
801 case R_68K_GNU_VTINHERIT:
802 case R_68K_GNU_VTENTRY:
803 break;
804
805 default:
806 switch (h->root.type)
807 {
808 default:
809 break;
810
811 case bfd_link_hash_defined:
812 case bfd_link_hash_defweak:
813 return h->root.u.def.section;
814
815 case bfd_link_hash_common:
816 return h->root.u.c.p->section;
817 }
818 }
819 }
820 else
821 {
822 if (!(elf_bad_symtab (abfd)
823 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
824 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
825 && sym->st_shndx != SHN_COMMON))
826 {
827 return bfd_section_from_elf_index (abfd, sym->st_shndx);
828 }
829 }
830
831 return NULL;
832 }
833
834 /* Update the got entry reference counts for the section being removed. */
835
836 static boolean
837 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
838 bfd *abfd;
839 struct bfd_link_info *info;
840 asection *sec;
841 const Elf_Internal_Rela *relocs;
842 {
843 Elf_Internal_Shdr *symtab_hdr;
844 struct elf_link_hash_entry **sym_hashes;
845 bfd_signed_vma *local_got_refcounts;
846 const Elf_Internal_Rela *rel, *relend;
847 unsigned long r_symndx;
848 struct elf_link_hash_entry *h;
849 bfd *dynobj;
850 asection *sgot;
851 asection *srelgot;
852
853 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
854 sym_hashes = elf_sym_hashes (abfd);
855 local_got_refcounts = elf_local_got_refcounts (abfd);
856
857 dynobj = elf_hash_table (info)->dynobj;
858 if (dynobj == NULL)
859 return true;
860
861 sgot = bfd_get_section_by_name (dynobj, ".got");
862 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
863
864 relend = relocs + sec->reloc_count;
865 for (rel = relocs; rel < relend; rel++)
866 {
867 switch (ELF32_R_TYPE (rel->r_info))
868 {
869 case R_68K_GOT8:
870 case R_68K_GOT16:
871 case R_68K_GOT32:
872 case R_68K_GOT8O:
873 case R_68K_GOT16O:
874 case R_68K_GOT32O:
875 r_symndx = ELF32_R_SYM (rel->r_info);
876 if (r_symndx >= symtab_hdr->sh_info)
877 {
878 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
879 if (h->got.refcount > 0)
880 {
881 --h->got.refcount;
882 if (h->got.refcount == 0)
883 {
884 /* We don't need the .got entry any more. */
885 sgot->_raw_size -= 4;
886 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
887 }
888 }
889 }
890 else if (local_got_refcounts != NULL)
891 {
892 if (local_got_refcounts[r_symndx] > 0)
893 {
894 --local_got_refcounts[r_symndx];
895 if (local_got_refcounts[r_symndx] == 0)
896 {
897 /* We don't need the .got entry any more. */
898 sgot->_raw_size -= 4;
899 if (info->shared)
900 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
901 }
902 }
903 }
904 break;
905
906 case R_68K_PLT8:
907 case R_68K_PLT16:
908 case R_68K_PLT32:
909 case R_68K_PLT8O:
910 case R_68K_PLT16O:
911 case R_68K_PLT32O:
912 case R_68K_PC8:
913 case R_68K_PC16:
914 case R_68K_PC32:
915 case R_68K_8:
916 case R_68K_16:
917 case R_68K_32:
918 r_symndx = ELF32_R_SYM (rel->r_info);
919 if (r_symndx >= symtab_hdr->sh_info)
920 {
921 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
922 if (h->plt.refcount > 0)
923 --h->plt.refcount;
924 }
925 break;
926
927 default:
928 break;
929 }
930 }
931
932 return true;
933 }
934
935 /* Adjust a symbol defined by a dynamic object and referenced by a
936 regular object. The current definition is in some section of the
937 dynamic object, but we're not including those sections. We have to
938 change the definition to something the rest of the link can
939 understand. */
940
941 static boolean
942 elf_m68k_adjust_dynamic_symbol (info, h)
943 struct bfd_link_info *info;
944 struct elf_link_hash_entry *h;
945 {
946 bfd *dynobj;
947 asection *s;
948 unsigned int power_of_two;
949
950 dynobj = elf_hash_table (info)->dynobj;
951
952 /* Make sure we know what is going on here. */
953 BFD_ASSERT (dynobj != NULL
954 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
955 || h->weakdef != NULL
956 || ((h->elf_link_hash_flags
957 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
958 && (h->elf_link_hash_flags
959 & ELF_LINK_HASH_REF_REGULAR) != 0
960 && (h->elf_link_hash_flags
961 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
962
963 /* If this is a function, put it in the procedure linkage table. We
964 will fill in the contents of the procedure linkage table later,
965 when we know the address of the .got section. */
966 if (h->type == STT_FUNC
967 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
968 {
969 if (! info->shared
970 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
971 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
972 /* We must always create the plt entry if it was referenced
973 by a PLTxxO relocation. In this case we already recorded
974 it as a dynamic symbol. */
975 && h->dynindx == -1)
976 {
977 /* This case can occur if we saw a PLTxx reloc in an input
978 file, but the symbol was never referred to by a dynamic
979 object. In such a case, we don't actually need to build
980 a procedure linkage table, and we can just do a PCxx
981 reloc instead. */
982 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
983 h->plt.offset = (bfd_vma) -1;
984 return true;
985 }
986
987 /* GC may have rendered this entry unused. */
988 if (h->plt.refcount <= 0)
989 {
990 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
991 h->plt.offset = (bfd_vma) -1;
992 return true;
993 }
994
995 /* Make sure this symbol is output as a dynamic symbol. */
996 if (h->dynindx == -1)
997 {
998 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
999 return false;
1000 }
1001
1002 s = bfd_get_section_by_name (dynobj, ".plt");
1003 BFD_ASSERT (s != NULL);
1004
1005 /* If this is the first .plt entry, make room for the special
1006 first entry. */
1007 if (s->_raw_size == 0)
1008 {
1009 if (CPU32_FLAG (dynobj))
1010 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1011 else
1012 s->_raw_size += PLT_ENTRY_SIZE;
1013 }
1014
1015 /* If this symbol is not defined in a regular file, and we are
1016 not generating a shared library, then set the symbol to this
1017 location in the .plt. This is required to make function
1018 pointers compare as equal between the normal executable and
1019 the shared library. */
1020 if (!info->shared
1021 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1022 {
1023 h->root.u.def.section = s;
1024 h->root.u.def.value = s->_raw_size;
1025 }
1026
1027 h->plt.offset = s->_raw_size;
1028
1029 /* Make room for this entry. */
1030 if (CPU32_FLAG (dynobj))
1031 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1032 else
1033 s->_raw_size += PLT_ENTRY_SIZE;
1034
1035 /* We also need to make an entry in the .got.plt section, which
1036 will be placed in the .got section by the linker script. */
1037
1038 s = bfd_get_section_by_name (dynobj, ".got.plt");
1039 BFD_ASSERT (s != NULL);
1040 s->_raw_size += 4;
1041
1042 /* We also need to make an entry in the .rela.plt section. */
1043
1044 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1045 BFD_ASSERT (s != NULL);
1046 s->_raw_size += sizeof (Elf32_External_Rela);
1047
1048 return true;
1049 }
1050
1051 /* Reinitialize the plt offset now that it is not used as a reference
1052 count any more. */
1053 h->plt.offset = (bfd_vma) -1;
1054
1055 /* If this is a weak symbol, and there is a real definition, the
1056 processor independent code will have arranged for us to see the
1057 real definition first, and we can just use the same value. */
1058 if (h->weakdef != NULL)
1059 {
1060 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1061 || h->weakdef->root.type == bfd_link_hash_defweak);
1062 h->root.u.def.section = h->weakdef->root.u.def.section;
1063 h->root.u.def.value = h->weakdef->root.u.def.value;
1064 return true;
1065 }
1066
1067 /* This is a reference to a symbol defined by a dynamic object which
1068 is not a function. */
1069
1070 /* If we are creating a shared library, we must presume that the
1071 only references to the symbol are via the global offset table.
1072 For such cases we need not do anything here; the relocations will
1073 be handled correctly by relocate_section. */
1074 if (info->shared)
1075 return true;
1076
1077 /* We must allocate the symbol in our .dynbss section, which will
1078 become part of the .bss section of the executable. There will be
1079 an entry for this symbol in the .dynsym section. The dynamic
1080 object will contain position independent code, so all references
1081 from the dynamic object to this symbol will go through the global
1082 offset table. The dynamic linker will use the .dynsym entry to
1083 determine the address it must put in the global offset table, so
1084 both the dynamic object and the regular object will refer to the
1085 same memory location for the variable. */
1086
1087 s = bfd_get_section_by_name (dynobj, ".dynbss");
1088 BFD_ASSERT (s != NULL);
1089
1090 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1091 copy the initial value out of the dynamic object and into the
1092 runtime process image. We need to remember the offset into the
1093 .rela.bss section we are going to use. */
1094 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1095 {
1096 asection *srel;
1097
1098 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1099 BFD_ASSERT (srel != NULL);
1100 srel->_raw_size += sizeof (Elf32_External_Rela);
1101 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1102 }
1103
1104 /* We need to figure out the alignment required for this symbol. I
1105 have no idea how ELF linkers handle this. */
1106 power_of_two = bfd_log2 (h->size);
1107 if (power_of_two > 3)
1108 power_of_two = 3;
1109
1110 /* Apply the required alignment. */
1111 s->_raw_size = BFD_ALIGN (s->_raw_size,
1112 (bfd_size_type) (1 << power_of_two));
1113 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1114 {
1115 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1116 return false;
1117 }
1118
1119 /* Define the symbol as being at this point in the section. */
1120 h->root.u.def.section = s;
1121 h->root.u.def.value = s->_raw_size;
1122
1123 /* Increment the section size to make room for the symbol. */
1124 s->_raw_size += h->size;
1125
1126 return true;
1127 }
1128
1129 /* Set the sizes of the dynamic sections. */
1130
1131 static boolean
1132 elf_m68k_size_dynamic_sections (output_bfd, info)
1133 bfd *output_bfd;
1134 struct bfd_link_info *info;
1135 {
1136 bfd *dynobj;
1137 asection *s;
1138 boolean plt;
1139 boolean relocs;
1140 boolean reltext;
1141
1142 dynobj = elf_hash_table (info)->dynobj;
1143 BFD_ASSERT (dynobj != NULL);
1144
1145 if (elf_hash_table (info)->dynamic_sections_created)
1146 {
1147 /* Set the contents of the .interp section to the interpreter. */
1148 if (!info->shared)
1149 {
1150 s = bfd_get_section_by_name (dynobj, ".interp");
1151 BFD_ASSERT (s != NULL);
1152 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1153 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1154 }
1155 }
1156 else
1157 {
1158 /* We may have created entries in the .rela.got section.
1159 However, if we are not creating the dynamic sections, we will
1160 not actually use these entries. Reset the size of .rela.got,
1161 which will cause it to get stripped from the output file
1162 below. */
1163 s = bfd_get_section_by_name (dynobj, ".rela.got");
1164 if (s != NULL)
1165 s->_raw_size = 0;
1166 }
1167
1168 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1169 relative relocs against symbols defined in a regular object. We
1170 allocated space for them in the check_relocs routine, but we will not
1171 fill them in in the relocate_section routine. */
1172 if (info->shared && info->symbolic)
1173 elf_m68k_link_hash_traverse (elf_m68k_hash_table (info),
1174 elf_m68k_discard_copies,
1175 (PTR) NULL);
1176
1177 /* The check_relocs and adjust_dynamic_symbol entry points have
1178 determined the sizes of the various dynamic sections. Allocate
1179 memory for them. */
1180 plt = false;
1181 relocs = false;
1182 reltext = false;
1183 for (s = dynobj->sections; s != NULL; s = s->next)
1184 {
1185 const char *name;
1186 boolean strip;
1187
1188 if ((s->flags & SEC_LINKER_CREATED) == 0)
1189 continue;
1190
1191 /* It's OK to base decisions on the section name, because none
1192 of the dynobj section names depend upon the input files. */
1193 name = bfd_get_section_name (dynobj, s);
1194
1195 strip = false;
1196
1197 if (strcmp (name, ".plt") == 0)
1198 {
1199 if (s->_raw_size == 0)
1200 {
1201 /* Strip this section if we don't need it; see the
1202 comment below. */
1203 strip = true;
1204 }
1205 else
1206 {
1207 /* Remember whether there is a PLT. */
1208 plt = true;
1209 }
1210 }
1211 else if (strncmp (name, ".rela", 5) == 0)
1212 {
1213 if (s->_raw_size == 0)
1214 {
1215 /* If we don't need this section, strip it from the
1216 output file. This is mostly to handle .rela.bss and
1217 .rela.plt. We must create both sections in
1218 create_dynamic_sections, because they must be created
1219 before the linker maps input sections to output
1220 sections. The linker does that before
1221 adjust_dynamic_symbol is called, and it is that
1222 function which decides whether anything needs to go
1223 into these sections. */
1224 strip = true;
1225 }
1226 else
1227 {
1228 asection *target;
1229
1230 /* Remember whether there are any reloc sections other
1231 than .rela.plt. */
1232 if (strcmp (name, ".rela.plt") != 0)
1233 {
1234 const char *outname;
1235
1236 relocs = true;
1237
1238 /* If this relocation section applies to a read only
1239 section, then we probably need a DT_TEXTREL
1240 entry. .rela.plt is actually associated with
1241 .got.plt, which is never readonly. */
1242 outname = bfd_get_section_name (output_bfd,
1243 s->output_section);
1244 target = bfd_get_section_by_name (output_bfd, outname + 5);
1245 if (target != NULL
1246 && (target->flags & SEC_READONLY) != 0
1247 && (target->flags & SEC_ALLOC) != 0)
1248 reltext = true;
1249 }
1250
1251 /* We use the reloc_count field as a counter if we need
1252 to copy relocs into the output file. */
1253 s->reloc_count = 0;
1254 }
1255 }
1256 else if (strncmp (name, ".got", 4) != 0)
1257 {
1258 /* It's not one of our sections, so don't allocate space. */
1259 continue;
1260 }
1261
1262 if (strip)
1263 {
1264 _bfd_strip_section_from_output (info, s);
1265 continue;
1266 }
1267
1268 /* Allocate memory for the section contents. */
1269 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1270 Unused entries should be reclaimed before the section's contents
1271 are written out, but at the moment this does not happen. Thus in
1272 order to prevent writing out garbage, we initialise the section's
1273 contents to zero. */
1274 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1275 if (s->contents == NULL && s->_raw_size != 0)
1276 return false;
1277 }
1278
1279 if (elf_hash_table (info)->dynamic_sections_created)
1280 {
1281 /* Add some entries to the .dynamic section. We fill in the
1282 values later, in elf_m68k_finish_dynamic_sections, but we
1283 must add the entries now so that we get the correct size for
1284 the .dynamic section. The DT_DEBUG entry is filled in by the
1285 dynamic linker and used by the debugger. */
1286 if (!info->shared)
1287 {
1288 if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
1289 return false;
1290 }
1291
1292 if (plt)
1293 {
1294 if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
1295 || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
1296 || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
1297 || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
1298 return false;
1299 }
1300
1301 if (relocs)
1302 {
1303 if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
1304 || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
1305 || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
1306 sizeof (Elf32_External_Rela)))
1307 return false;
1308 }
1309
1310 if (reltext)
1311 {
1312 if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
1313 return false;
1314 info->flags |= DF_TEXTREL;
1315 }
1316 }
1317
1318 return true;
1319 }
1320
1321 /* This function is called via elf_m68k_link_hash_traverse if we are
1322 creating a shared object with -Bsymbolic. It discards the space
1323 allocated to copy PC relative relocs against symbols which are defined
1324 in regular objects. We allocated space for them in the check_relocs
1325 routine, but we won't fill them in in the relocate_section routine. */
1326
1327 static boolean
1328 elf_m68k_discard_copies (h, ignore)
1329 struct elf_m68k_link_hash_entry *h;
1330 PTR ignore ATTRIBUTE_UNUSED;
1331 {
1332 struct elf_m68k_pcrel_relocs_copied *s;
1333
1334 /* We only discard relocs for symbols defined in a regular object. */
1335 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1336 return true;
1337
1338 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1339 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1340
1341 return true;
1342 }
1343
1344 /* Relocate an M68K ELF section. */
1345
1346 static boolean
1347 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1348 contents, relocs, local_syms, local_sections)
1349 bfd *output_bfd;
1350 struct bfd_link_info *info;
1351 bfd *input_bfd;
1352 asection *input_section;
1353 bfd_byte *contents;
1354 Elf_Internal_Rela *relocs;
1355 Elf_Internal_Sym *local_syms;
1356 asection **local_sections;
1357 {
1358 bfd *dynobj;
1359 Elf_Internal_Shdr *symtab_hdr;
1360 struct elf_link_hash_entry **sym_hashes;
1361 bfd_vma *local_got_offsets;
1362 asection *sgot;
1363 asection *splt;
1364 asection *sreloc;
1365 Elf_Internal_Rela *rel;
1366 Elf_Internal_Rela *relend;
1367
1368 dynobj = elf_hash_table (info)->dynobj;
1369 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1370 sym_hashes = elf_sym_hashes (input_bfd);
1371 local_got_offsets = elf_local_got_offsets (input_bfd);
1372
1373 sgot = NULL;
1374 splt = NULL;
1375 sreloc = NULL;
1376
1377 rel = relocs;
1378 relend = relocs + input_section->reloc_count;
1379 for (; rel < relend; rel++)
1380 {
1381 int r_type;
1382 reloc_howto_type *howto;
1383 unsigned long r_symndx;
1384 struct elf_link_hash_entry *h;
1385 Elf_Internal_Sym *sym;
1386 asection *sec;
1387 bfd_vma relocation;
1388 bfd_reloc_status_type r;
1389
1390 r_type = ELF32_R_TYPE (rel->r_info);
1391 if (r_type < 0 || r_type >= (int) R_68K_max)
1392 {
1393 bfd_set_error (bfd_error_bad_value);
1394 return false;
1395 }
1396 howto = howto_table + r_type;
1397
1398 r_symndx = ELF32_R_SYM (rel->r_info);
1399
1400 if (info->relocateable)
1401 {
1402 /* This is a relocateable link. We don't have to change
1403 anything, unless the reloc is against a section symbol,
1404 in which case we have to adjust according to where the
1405 section symbol winds up in the output section. */
1406 if (r_symndx < symtab_hdr->sh_info)
1407 {
1408 sym = local_syms + r_symndx;
1409 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1410 {
1411 sec = local_sections[r_symndx];
1412 rel->r_addend += sec->output_offset + sym->st_value;
1413 }
1414 }
1415
1416 continue;
1417 }
1418
1419 /* This is a final link. */
1420 h = NULL;
1421 sym = NULL;
1422 sec = NULL;
1423 if (r_symndx < symtab_hdr->sh_info)
1424 {
1425 sym = local_syms + r_symndx;
1426 sec = local_sections[r_symndx];
1427 relocation = (sec->output_section->vma
1428 + sec->output_offset
1429 + sym->st_value);
1430 }
1431 else
1432 {
1433 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1434 while (h->root.type == bfd_link_hash_indirect
1435 || h->root.type == bfd_link_hash_warning)
1436 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1437 if (h->root.type == bfd_link_hash_defined
1438 || h->root.type == bfd_link_hash_defweak)
1439 {
1440 sec = h->root.u.def.section;
1441 if (((r_type == R_68K_PLT8
1442 || r_type == R_68K_PLT16
1443 || r_type == R_68K_PLT32
1444 || r_type == R_68K_PLT8O
1445 || r_type == R_68K_PLT16O
1446 || r_type == R_68K_PLT32O)
1447 && h->plt.offset != (bfd_vma) -1
1448 && elf_hash_table (info)->dynamic_sections_created)
1449 || ((r_type == R_68K_GOT8O
1450 || r_type == R_68K_GOT16O
1451 || r_type == R_68K_GOT32O
1452 || ((r_type == R_68K_GOT8
1453 || r_type == R_68K_GOT16
1454 || r_type == R_68K_GOT32)
1455 && strcmp (h->root.root.string,
1456 "_GLOBAL_OFFSET_TABLE_") != 0))
1457 && elf_hash_table (info)->dynamic_sections_created
1458 && (! info->shared
1459 || (! info->symbolic && h->dynindx != -1)
1460 || (h->elf_link_hash_flags
1461 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1462 || (info->shared
1463 && ((! info->symbolic && h->dynindx != -1)
1464 || (h->elf_link_hash_flags
1465 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1466 && ((input_section->flags & SEC_ALLOC) != 0
1467 /* DWARF will emit R_68K_32 relocations in its
1468 sections against symbols defined externally
1469 in shared libraries. We can't do anything
1470 with them here. */
1471 || ((input_section->flags & SEC_DEBUGGING) != 0
1472 && (h->elf_link_hash_flags
1473 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1474 && (r_type == R_68K_8
1475 || r_type == R_68K_16
1476 || r_type == R_68K_32
1477 || r_type == R_68K_PC8
1478 || r_type == R_68K_PC16
1479 || r_type == R_68K_PC32)))
1480 {
1481 /* In these cases, we don't need the relocation
1482 value. We check specially because in some
1483 obscure cases sec->output_section will be NULL. */
1484 relocation = 0;
1485 }
1486 else
1487 relocation = (h->root.u.def.value
1488 + sec->output_section->vma
1489 + sec->output_offset);
1490 }
1491 else if (h->root.type == bfd_link_hash_undefweak)
1492 relocation = 0;
1493 else if (info->shared && !info->symbolic
1494 && !info->no_undefined
1495 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1496 relocation = 0;
1497 else
1498 {
1499 if (!(info->callbacks->undefined_symbol
1500 (info, h->root.root.string, input_bfd,
1501 input_section, rel->r_offset,
1502 (!info->shared || info->no_undefined
1503 || ELF_ST_VISIBILITY (h->other)))))
1504 return false;
1505 relocation = 0;
1506 }
1507 }
1508
1509 switch (r_type)
1510 {
1511 case R_68K_GOT8:
1512 case R_68K_GOT16:
1513 case R_68K_GOT32:
1514 /* Relocation is to the address of the entry for this symbol
1515 in the global offset table. */
1516 if (h != NULL
1517 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1518 break;
1519 /* Fall through. */
1520 case R_68K_GOT8O:
1521 case R_68K_GOT16O:
1522 case R_68K_GOT32O:
1523 /* Relocation is the offset of the entry for this symbol in
1524 the global offset table. */
1525
1526 {
1527 bfd_vma off;
1528
1529 if (sgot == NULL)
1530 {
1531 sgot = bfd_get_section_by_name (dynobj, ".got");
1532 BFD_ASSERT (sgot != NULL);
1533 }
1534
1535 if (h != NULL)
1536 {
1537 off = h->got.offset;
1538 BFD_ASSERT (off != (bfd_vma) -1);
1539
1540 if (!elf_hash_table (info)->dynamic_sections_created
1541 || (info->shared
1542 && (info->symbolic || h->dynindx == -1)
1543 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1544 {
1545 /* This is actually a static link, or it is a
1546 -Bsymbolic link and the symbol is defined
1547 locally, or the symbol was forced to be local
1548 because of a version file.. We must initialize
1549 this entry in the global offset table. Since
1550 the offset must always be a multiple of 4, we
1551 use the least significant bit to record whether
1552 we have initialized it already.
1553
1554 When doing a dynamic link, we create a .rela.got
1555 relocation entry to initialize the value. This
1556 is done in the finish_dynamic_symbol routine. */
1557 if ((off & 1) != 0)
1558 off &= ~1;
1559 else
1560 {
1561 bfd_put_32 (output_bfd, relocation,
1562 sgot->contents + off);
1563 h->got.offset |= 1;
1564 }
1565 }
1566 }
1567 else
1568 {
1569 BFD_ASSERT (local_got_offsets != NULL
1570 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1571
1572 off = local_got_offsets[r_symndx];
1573
1574 /* The offset must always be a multiple of 4. We use
1575 the least significant bit to record whether we have
1576 already generated the necessary reloc. */
1577 if ((off & 1) != 0)
1578 off &= ~1;
1579 else
1580 {
1581 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1582
1583 if (info->shared)
1584 {
1585 asection *srelgot;
1586 Elf_Internal_Rela outrel;
1587
1588 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1589 BFD_ASSERT (srelgot != NULL);
1590
1591 outrel.r_offset = (sgot->output_section->vma
1592 + sgot->output_offset
1593 + off);
1594 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1595 outrel.r_addend = relocation;
1596 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1597 (((Elf32_External_Rela *)
1598 srelgot->contents)
1599 + srelgot->reloc_count));
1600 ++srelgot->reloc_count;
1601 }
1602
1603 local_got_offsets[r_symndx] |= 1;
1604 }
1605 }
1606
1607 relocation = sgot->output_offset + off;
1608 if (r_type == R_68K_GOT8O
1609 || r_type == R_68K_GOT16O
1610 || r_type == R_68K_GOT32O)
1611 {
1612 /* This relocation does not use the addend. */
1613 rel->r_addend = 0;
1614 }
1615 else
1616 relocation += sgot->output_section->vma;
1617 }
1618 break;
1619
1620 case R_68K_PLT8:
1621 case R_68K_PLT16:
1622 case R_68K_PLT32:
1623 /* Relocation is to the entry for this symbol in the
1624 procedure linkage table. */
1625
1626 /* Resolve a PLTxx reloc against a local symbol directly,
1627 without using the procedure linkage table. */
1628 if (h == NULL)
1629 break;
1630
1631 if (h->plt.offset == (bfd_vma) -1
1632 || !elf_hash_table (info)->dynamic_sections_created)
1633 {
1634 /* We didn't make a PLT entry for this symbol. This
1635 happens when statically linking PIC code, or when
1636 using -Bsymbolic. */
1637 break;
1638 }
1639
1640 if (splt == NULL)
1641 {
1642 splt = bfd_get_section_by_name (dynobj, ".plt");
1643 BFD_ASSERT (splt != NULL);
1644 }
1645
1646 relocation = (splt->output_section->vma
1647 + splt->output_offset
1648 + h->plt.offset);
1649 break;
1650
1651 case R_68K_PLT8O:
1652 case R_68K_PLT16O:
1653 case R_68K_PLT32O:
1654 /* Relocation is the offset of the entry for this symbol in
1655 the procedure linkage table. */
1656 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1657
1658 if (splt == NULL)
1659 {
1660 splt = bfd_get_section_by_name (dynobj, ".plt");
1661 BFD_ASSERT (splt != NULL);
1662 }
1663
1664 relocation = h->plt.offset;
1665
1666 /* This relocation does not use the addend. */
1667 rel->r_addend = 0;
1668
1669 break;
1670
1671 case R_68K_PC8:
1672 case R_68K_PC16:
1673 case R_68K_PC32:
1674 if (h == NULL)
1675 break;
1676 /* Fall through. */
1677 case R_68K_8:
1678 case R_68K_16:
1679 case R_68K_32:
1680 if (info->shared
1681 && (input_section->flags & SEC_ALLOC) != 0
1682 && ((r_type != R_68K_PC8
1683 && r_type != R_68K_PC16
1684 && r_type != R_68K_PC32)
1685 || (!info->symbolic
1686 || (h->elf_link_hash_flags
1687 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1688 {
1689 Elf_Internal_Rela outrel;
1690 boolean skip, relocate;
1691
1692 /* When generating a shared object, these relocations
1693 are copied into the output file to be resolved at run
1694 time. */
1695
1696 if (sreloc == NULL)
1697 {
1698 const char *name;
1699
1700 name = (bfd_elf_string_from_elf_section
1701 (input_bfd,
1702 elf_elfheader (input_bfd)->e_shstrndx,
1703 elf_section_data (input_section)->rel_hdr.sh_name));
1704 if (name == NULL)
1705 return false;
1706
1707 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1708 && strcmp (bfd_get_section_name (input_bfd,
1709 input_section),
1710 name + 5) == 0);
1711
1712 sreloc = bfd_get_section_by_name (dynobj, name);
1713 BFD_ASSERT (sreloc != NULL);
1714 }
1715
1716 skip = false;
1717
1718 if (elf_section_data (input_section)->stab_info == NULL)
1719 outrel.r_offset = rel->r_offset;
1720 else
1721 {
1722 bfd_vma off;
1723
1724 off = (_bfd_stab_section_offset
1725 (output_bfd, &elf_hash_table (info)->stab_info,
1726 input_section,
1727 &elf_section_data (input_section)->stab_info,
1728 rel->r_offset));
1729 if (off == (bfd_vma) -1)
1730 skip = true;
1731 outrel.r_offset = off;
1732 }
1733
1734 outrel.r_offset += (input_section->output_section->vma
1735 + input_section->output_offset);
1736
1737 if (skip)
1738 {
1739 memset (&outrel, 0, sizeof outrel);
1740 relocate = false;
1741 }
1742 /* h->dynindx may be -1 if the symbol was marked to
1743 become local. */
1744 else if (h != NULL
1745 && ((! info->symbolic && h->dynindx != -1)
1746 || (h->elf_link_hash_flags
1747 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1748 {
1749 BFD_ASSERT (h->dynindx != -1);
1750 relocate = false;
1751 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1752 outrel.r_addend = relocation + rel->r_addend;
1753 }
1754 else
1755 {
1756 if (r_type == R_68K_32)
1757 {
1758 relocate = true;
1759 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1760 outrel.r_addend = relocation + rel->r_addend;
1761 }
1762 else
1763 {
1764 long indx;
1765
1766 if (h == NULL)
1767 sec = local_sections[r_symndx];
1768 else
1769 {
1770 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1771 || (h->root.type
1772 == bfd_link_hash_defweak));
1773 sec = h->root.u.def.section;
1774 }
1775 if (sec != NULL && bfd_is_abs_section (sec))
1776 indx = 0;
1777 else if (sec == NULL || sec->owner == NULL)
1778 {
1779 bfd_set_error (bfd_error_bad_value);
1780 return false;
1781 }
1782 else
1783 {
1784 asection *osec;
1785
1786 osec = sec->output_section;
1787 indx = elf_section_data (osec)->dynindx;
1788 BFD_ASSERT (indx > 0);
1789 }
1790
1791 relocate = false;
1792 outrel.r_info = ELF32_R_INFO (indx, r_type);
1793 outrel.r_addend = relocation + rel->r_addend;
1794 }
1795 }
1796
1797 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1798 (((Elf32_External_Rela *)
1799 sreloc->contents)
1800 + sreloc->reloc_count));
1801 ++sreloc->reloc_count;
1802
1803 /* This reloc will be computed at runtime, so there's no
1804 need to do anything now, except for R_68K_32
1805 relocations that have been turned into
1806 R_68K_RELATIVE. */
1807 if (!relocate)
1808 continue;
1809 }
1810
1811 break;
1812
1813 case R_68K_GNU_VTINHERIT:
1814 case R_68K_GNU_VTENTRY:
1815 /* These are no-ops in the end. */
1816 continue;
1817
1818 default:
1819 break;
1820 }
1821
1822 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1823 contents, rel->r_offset,
1824 relocation, rel->r_addend);
1825
1826 if (r != bfd_reloc_ok)
1827 {
1828 switch (r)
1829 {
1830 default:
1831 case bfd_reloc_outofrange:
1832 abort ();
1833 case bfd_reloc_overflow:
1834 {
1835 const char *name;
1836
1837 if (h != NULL)
1838 name = h->root.root.string;
1839 else
1840 {
1841 name = bfd_elf_string_from_elf_section (input_bfd,
1842 symtab_hdr->sh_link,
1843 sym->st_name);
1844 if (name == NULL)
1845 return false;
1846 if (*name == '\0')
1847 name = bfd_section_name (input_bfd, sec);
1848 }
1849 if (!(info->callbacks->reloc_overflow
1850 (info, name, howto->name, (bfd_vma) 0,
1851 input_bfd, input_section, rel->r_offset)))
1852 return false;
1853 }
1854 break;
1855 }
1856 }
1857 }
1858
1859 return true;
1860 }
1861
1862 /* Finish up dynamic symbol handling. We set the contents of various
1863 dynamic sections here. */
1864
1865 static boolean
1866 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1867 bfd *output_bfd;
1868 struct bfd_link_info *info;
1869 struct elf_link_hash_entry *h;
1870 Elf_Internal_Sym *sym;
1871 {
1872 bfd *dynobj;
1873 int plt_off1, plt_off2, plt_off3;
1874
1875 dynobj = elf_hash_table (info)->dynobj;
1876
1877 if (h->plt.offset != (bfd_vma) -1)
1878 {
1879 asection *splt;
1880 asection *sgot;
1881 asection *srela;
1882 bfd_vma plt_index;
1883 bfd_vma got_offset;
1884 Elf_Internal_Rela rela;
1885
1886 /* This symbol has an entry in the procedure linkage table. Set
1887 it up. */
1888
1889 BFD_ASSERT (h->dynindx != -1);
1890
1891 splt = bfd_get_section_by_name (dynobj, ".plt");
1892 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1893 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1894 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1895
1896 /* Get the index in the procedure linkage table which
1897 corresponds to this symbol. This is the index of this symbol
1898 in all the symbols for which we are making plt entries. The
1899 first entry in the procedure linkage table is reserved. */
1900 if ( CPU32_FLAG (output_bfd))
1901 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1902 else
1903 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1904
1905 /* Get the offset into the .got table of the entry that
1906 corresponds to this function. Each .got entry is 4 bytes.
1907 The first three are reserved. */
1908 got_offset = (plt_index + 3) * 4;
1909
1910 if ( CPU32_FLAG (output_bfd))
1911 {
1912 /* Fill in the entry in the procedure linkage table. */
1913 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1914 PLT_CPU32_ENTRY_SIZE);
1915 plt_off1 = 4;
1916 plt_off2 = 12;
1917 plt_off3 = 18;
1918 }
1919 else
1920 {
1921 /* Fill in the entry in the procedure linkage table. */
1922 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1923 PLT_ENTRY_SIZE);
1924 plt_off1 = 4;
1925 plt_off2 = 10;
1926 plt_off3 = 16;
1927 }
1928
1929 /* The offset is relative to the first extension word. */
1930 bfd_put_32 (output_bfd,
1931 (sgot->output_section->vma
1932 + sgot->output_offset
1933 + got_offset
1934 - (splt->output_section->vma
1935 + h->plt.offset + 2)),
1936 splt->contents + h->plt.offset + plt_off1);
1937
1938 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1939 splt->contents + h->plt.offset + plt_off2);
1940 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1941 splt->contents + h->plt.offset + plt_off3);
1942
1943 /* Fill in the entry in the global offset table. */
1944 bfd_put_32 (output_bfd,
1945 (splt->output_section->vma
1946 + splt->output_offset
1947 + h->plt.offset
1948 + 8),
1949 sgot->contents + got_offset);
1950
1951 /* Fill in the entry in the .rela.plt section. */
1952 rela.r_offset = (sgot->output_section->vma
1953 + sgot->output_offset
1954 + got_offset);
1955 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1956 rela.r_addend = 0;
1957 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1958 ((Elf32_External_Rela *) srela->contents
1959 + plt_index));
1960
1961 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1962 {
1963 /* Mark the symbol as undefined, rather than as defined in
1964 the .plt section. Leave the value alone. */
1965 sym->st_shndx = SHN_UNDEF;
1966 }
1967 }
1968
1969 if (h->got.offset != (bfd_vma) -1)
1970 {
1971 asection *sgot;
1972 asection *srela;
1973 Elf_Internal_Rela rela;
1974
1975 /* This symbol has an entry in the global offset table. Set it
1976 up. */
1977
1978 sgot = bfd_get_section_by_name (dynobj, ".got");
1979 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1980 BFD_ASSERT (sgot != NULL && srela != NULL);
1981
1982 rela.r_offset = (sgot->output_section->vma
1983 + sgot->output_offset
1984 + (h->got.offset &~ 1));
1985
1986 /* If this is a -Bsymbolic link, and the symbol is defined
1987 locally, we just want to emit a RELATIVE reloc. Likewise if
1988 the symbol was forced to be local because of a version file.
1989 The entry in the global offset table will already have been
1990 initialized in the relocate_section function. */
1991 if (info->shared
1992 && (info->symbolic || h->dynindx == -1)
1993 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1994 {
1995 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1996 rela.r_addend = bfd_get_signed_32 (output_bfd,
1997 (sgot->contents
1998 + (h->got.offset & ~1)));
1999 }
2000 else
2001 {
2002 bfd_put_32 (output_bfd, (bfd_vma) 0,
2003 sgot->contents + (h->got.offset & ~1));
2004 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
2005 rela.r_addend = 0;
2006 }
2007
2008 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2009 ((Elf32_External_Rela *) srela->contents
2010 + srela->reloc_count));
2011 ++srela->reloc_count;
2012 }
2013
2014 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2015 {
2016 asection *s;
2017 Elf_Internal_Rela rela;
2018
2019 /* This symbol needs a copy reloc. Set it up. */
2020
2021 BFD_ASSERT (h->dynindx != -1
2022 && (h->root.type == bfd_link_hash_defined
2023 || h->root.type == bfd_link_hash_defweak));
2024
2025 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2026 ".rela.bss");
2027 BFD_ASSERT (s != NULL);
2028
2029 rela.r_offset = (h->root.u.def.value
2030 + h->root.u.def.section->output_section->vma
2031 + h->root.u.def.section->output_offset);
2032 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
2033 rela.r_addend = 0;
2034 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2035 ((Elf32_External_Rela *) s->contents
2036 + s->reloc_count));
2037 ++s->reloc_count;
2038 }
2039
2040 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2041 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2042 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2043 sym->st_shndx = SHN_ABS;
2044
2045 return true;
2046 }
2047
2048 /* Finish up the dynamic sections. */
2049
2050 static boolean
2051 elf_m68k_finish_dynamic_sections (output_bfd, info)
2052 bfd *output_bfd;
2053 struct bfd_link_info *info;
2054 {
2055 bfd *dynobj;
2056 asection *sgot;
2057 asection *sdyn;
2058
2059 dynobj = elf_hash_table (info)->dynobj;
2060
2061 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2062 BFD_ASSERT (sgot != NULL);
2063 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2064
2065 if (elf_hash_table (info)->dynamic_sections_created)
2066 {
2067 asection *splt;
2068 Elf32_External_Dyn *dyncon, *dynconend;
2069
2070 splt = bfd_get_section_by_name (dynobj, ".plt");
2071 BFD_ASSERT (splt != NULL && sdyn != NULL);
2072
2073 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2074 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2075 for (; dyncon < dynconend; dyncon++)
2076 {
2077 Elf_Internal_Dyn dyn;
2078 const char *name;
2079 asection *s;
2080
2081 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2082
2083 switch (dyn.d_tag)
2084 {
2085 default:
2086 break;
2087
2088 case DT_PLTGOT:
2089 name = ".got";
2090 goto get_vma;
2091 case DT_JMPREL:
2092 name = ".rela.plt";
2093 get_vma:
2094 s = bfd_get_section_by_name (output_bfd, name);
2095 BFD_ASSERT (s != NULL);
2096 dyn.d_un.d_ptr = s->vma;
2097 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2098 break;
2099
2100 case DT_PLTRELSZ:
2101 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2102 BFD_ASSERT (s != NULL);
2103 if (s->_cooked_size != 0)
2104 dyn.d_un.d_val = s->_cooked_size;
2105 else
2106 dyn.d_un.d_val = s->_raw_size;
2107 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2108 break;
2109
2110 case DT_RELASZ:
2111 /* The procedure linkage table relocs (DT_JMPREL) should
2112 not be included in the overall relocs (DT_RELA).
2113 Therefore, we override the DT_RELASZ entry here to
2114 make it not include the JMPREL relocs. Since the
2115 linker script arranges for .rela.plt to follow all
2116 other relocation sections, we don't have to worry
2117 about changing the DT_RELA entry. */
2118 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2119 if (s != NULL)
2120 {
2121 if (s->_cooked_size != 0)
2122 dyn.d_un.d_val -= s->_cooked_size;
2123 else
2124 dyn.d_un.d_val -= s->_raw_size;
2125 }
2126 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2127 break;
2128 }
2129 }
2130
2131 /* Fill in the first entry in the procedure linkage table. */
2132 if (splt->_raw_size > 0)
2133 {
2134 if (!CPU32_FLAG (output_bfd))
2135 {
2136 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2137 bfd_put_32 (output_bfd,
2138 (sgot->output_section->vma
2139 + sgot->output_offset + 4
2140 - (splt->output_section->vma + 2)),
2141 splt->contents + 4);
2142 bfd_put_32 (output_bfd,
2143 (sgot->output_section->vma
2144 + sgot->output_offset + 8
2145 - (splt->output_section->vma + 10)),
2146 splt->contents + 12);
2147 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2148 = PLT_ENTRY_SIZE;
2149 }
2150 else /* cpu32 */
2151 {
2152 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2153 bfd_put_32 (output_bfd,
2154 (sgot->output_section->vma
2155 + sgot->output_offset + 4
2156 - (splt->output_section->vma + 2)),
2157 splt->contents + 4);
2158 bfd_put_32 (output_bfd,
2159 (sgot->output_section->vma
2160 + sgot->output_offset + 8
2161 - (splt->output_section->vma + 10)),
2162 splt->contents + 12);
2163 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2164 = PLT_CPU32_ENTRY_SIZE;
2165 }
2166 }
2167 }
2168
2169 /* Fill in the first three entries in the global offset table. */
2170 if (sgot->_raw_size > 0)
2171 {
2172 if (sdyn == NULL)
2173 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2174 else
2175 bfd_put_32 (output_bfd,
2176 sdyn->output_section->vma + sdyn->output_offset,
2177 sgot->contents);
2178 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2179 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2180 }
2181
2182 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2183
2184 return true;
2185 }
2186
2187 /* Given a .data section and a .emreloc in-memory section, store
2188 relocation information into the .emreloc section which can be
2189 used at runtime to relocate the section. This is called by the
2190 linker when the --embedded-relocs switch is used. This is called
2191 after the add_symbols entry point has been called for all the
2192 objects, and before the final_link entry point is called. */
2193
2194 boolean
2195 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2196 bfd *abfd;
2197 struct bfd_link_info *info;
2198 asection *datasec;
2199 asection *relsec;
2200 char **errmsg;
2201 {
2202 Elf_Internal_Shdr *symtab_hdr;
2203 Elf32_External_Sym *extsyms;
2204 Elf32_External_Sym *free_extsyms = NULL;
2205 Elf_Internal_Rela *internal_relocs;
2206 Elf_Internal_Rela *free_relocs = NULL;
2207 Elf_Internal_Rela *irel, *irelend;
2208 bfd_byte *p;
2209
2210 BFD_ASSERT (! info->relocateable);
2211
2212 *errmsg = NULL;
2213
2214 if (datasec->reloc_count == 0)
2215 return true;
2216
2217 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2218 /* Read this BFD's symbols if we haven't done so already, or get the cached
2219 copy if it exists. */
2220 if (symtab_hdr->contents != NULL)
2221 extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
2222 else
2223 {
2224 /* Go get them off disk. */
2225 if (info->keep_memory)
2226 extsyms = ((Elf32_External_Sym *)
2227 bfd_alloc (abfd, symtab_hdr->sh_size));
2228 else
2229 extsyms = ((Elf32_External_Sym *)
2230 bfd_malloc (symtab_hdr->sh_size));
2231 if (extsyms == NULL)
2232 goto error_return;
2233 if (! info->keep_memory)
2234 free_extsyms = extsyms;
2235 if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
2236 || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd)
2237 != symtab_hdr->sh_size))
2238 goto error_return;
2239 if (info->keep_memory)
2240 symtab_hdr->contents = extsyms;
2241 }
2242
2243 /* Get a copy of the native relocations. */
2244 internal_relocs = (_bfd_elf32_link_read_relocs
2245 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2246 info->keep_memory));
2247 if (internal_relocs == NULL)
2248 goto error_return;
2249 if (! info->keep_memory)
2250 free_relocs = internal_relocs;
2251
2252 relsec->contents = (bfd_byte *) bfd_alloc (abfd, datasec->reloc_count * 12);
2253 if (relsec->contents == NULL)
2254 goto error_return;
2255
2256 p = relsec->contents;
2257
2258 irelend = internal_relocs + datasec->reloc_count;
2259 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2260 {
2261 asection *targetsec;
2262
2263 /* We are going to write a four byte longword into the runtime
2264 reloc section. The longword will be the address in the data
2265 section which must be relocated. It is followed by the name
2266 of the target section NUL-padded or truncated to 8
2267 characters. */
2268
2269 /* We can only relocate absolute longword relocs at run time. */
2270 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2271 {
2272 *errmsg = _("unsupported reloc type");
2273 bfd_set_error (bfd_error_bad_value);
2274 goto error_return;
2275 }
2276
2277 /* Get the target section referred to by the reloc. */
2278 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2279 {
2280 Elf_Internal_Sym isym;
2281
2282 /* A local symbol. */
2283 bfd_elf32_swap_symbol_in (abfd,
2284 extsyms + ELF32_R_SYM (irel->r_info),
2285 &isym);
2286
2287 targetsec = bfd_section_from_elf_index (abfd, isym.st_shndx);
2288 }
2289 else
2290 {
2291 unsigned long indx;
2292 struct elf_link_hash_entry *h;
2293
2294 /* An external symbol. */
2295 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2296 h = elf_sym_hashes (abfd)[indx];
2297 BFD_ASSERT (h != NULL);
2298 if (h->root.type == bfd_link_hash_defined
2299 || h->root.type == bfd_link_hash_defweak)
2300 targetsec = h->root.u.def.section;
2301 else
2302 targetsec = NULL;
2303 }
2304
2305 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2306 memset (p + 4, 0, 8);
2307 if (targetsec != NULL)
2308 strncpy (p + 4, targetsec->output_section->name, 8);
2309 }
2310
2311 if (free_extsyms != NULL)
2312 free (free_extsyms);
2313 if (free_relocs != NULL)
2314 free (free_relocs);
2315 return true;
2316
2317 error_return:
2318 if (free_extsyms != NULL)
2319 free (free_extsyms);
2320 if (free_relocs != NULL)
2321 free (free_relocs);
2322 return false;
2323 }
2324
2325 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2326 #define TARGET_BIG_NAME "elf32-m68k"
2327 #define ELF_MACHINE_CODE EM_68K
2328 #define ELF_MAXPAGESIZE 0x2000
2329 #define elf_backend_create_dynamic_sections \
2330 _bfd_elf_create_dynamic_sections
2331 #define bfd_elf32_bfd_link_hash_table_create \
2332 elf_m68k_link_hash_table_create
2333 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2334
2335 #define elf_backend_check_relocs elf_m68k_check_relocs
2336 #define elf_backend_adjust_dynamic_symbol \
2337 elf_m68k_adjust_dynamic_symbol
2338 #define elf_backend_size_dynamic_sections \
2339 elf_m68k_size_dynamic_sections
2340 #define elf_backend_relocate_section elf_m68k_relocate_section
2341 #define elf_backend_finish_dynamic_symbol \
2342 elf_m68k_finish_dynamic_symbol
2343 #define elf_backend_finish_dynamic_sections \
2344 elf_m68k_finish_dynamic_sections
2345 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2346 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2347 #define bfd_elf32_bfd_copy_private_bfd_data \
2348 elf32_m68k_copy_private_bfd_data
2349 #define bfd_elf32_bfd_merge_private_bfd_data \
2350 elf32_m68k_merge_private_bfd_data
2351 #define bfd_elf32_bfd_set_private_flags \
2352 elf32_m68k_set_private_flags
2353 #define bfd_elf32_bfd_print_private_bfd_data \
2354 elf32_m68k_print_private_bfd_data
2355
2356 #define elf_backend_can_gc_sections 1
2357 #define elf_backend_want_got_plt 1
2358 #define elf_backend_plt_readonly 1
2359 #define elf_backend_want_plt_sym 0
2360 #define elf_backend_got_header_size 12
2361
2362 #include "elf32-target.h"
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