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* ltcf-cxx.sh: Added file, required by 2000-11-18 merge.
[binutils.git] / bfd / elf32-m68k.c
blob9b5e93f529e58b4bc97a1e3a0b92b0459886c383
1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 95, 96, 97, 98, 1999 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19
20 #include "bfd.h"
21 #include "sysdep.h"
22 #include "bfdlink.h"
23 #include "libbfd.h"
24 #include "elf-bfd.h"
25 #include "elf/m68k.h"
26
27 static reloc_howto_type *reloc_type_lookup
28 PARAMS ((bfd *, bfd_reloc_code_real_type));
29 static void rtype_to_howto
30 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
31 static struct bfd_hash_entry *elf_m68k_link_hash_newfunc
32 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
33 static struct bfd_link_hash_table *elf_m68k_link_hash_table_create
34 PARAMS ((bfd *));
35 static boolean elf_m68k_check_relocs
36 PARAMS ((bfd *, struct bfd_link_info *, asection *,
37 const Elf_Internal_Rela *));
38 static asection *elf_m68k_gc_mark_hook
39 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
40 struct elf_link_hash_entry *, Elf_Internal_Sym *));
41 static boolean elf_m68k_gc_sweep_hook
42 PARAMS ((bfd *, struct bfd_link_info *, asection *,
43 const Elf_Internal_Rela *));
44 static boolean elf_m68k_adjust_dynamic_symbol
45 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
46 static boolean elf_m68k_size_dynamic_sections
47 PARAMS ((bfd *, struct bfd_link_info *));
48 static boolean elf_m68k_relocate_section
49 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
50 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
51 static boolean elf_m68k_finish_dynamic_symbol
52 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
53 Elf_Internal_Sym *));
54 static boolean elf_m68k_finish_dynamic_sections
55 PARAMS ((bfd *, struct bfd_link_info *));
56
57 static boolean elf32_m68k_set_private_flags
58 PARAMS ((bfd *, flagword));
59 static boolean elf32_m68k_copy_private_bfd_data
60 PARAMS ((bfd *, bfd *));
61 static boolean elf32_m68k_merge_private_bfd_data
62 PARAMS ((bfd *, bfd *));
63 static boolean elf32_m68k_print_private_bfd_data
64 PARAMS ((bfd *, PTR));
65
66 static reloc_howto_type howto_table[] = {
67 HOWTO(R_68K_NONE, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", false, 0, 0x00000000,false),
68 HOWTO(R_68K_32, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0, 0xffffffff,false),
69 HOWTO(R_68K_16, 0, 1,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0, 0x0000ffff,false),
70 HOWTO(R_68K_8, 0, 0, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0, 0x000000ff,false),
71 HOWTO(R_68K_PC32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", false, 0, 0xffffffff,true),
72 HOWTO(R_68K_PC16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0, 0x0000ffff,true),
73 HOWTO(R_68K_PC8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0, 0x000000ff,true),
74 HOWTO(R_68K_GOT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0, 0xffffffff,true),
75 HOWTO(R_68K_GOT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0, 0x0000ffff,true),
76 HOWTO(R_68K_GOT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0, 0x000000ff,true),
77 HOWTO(R_68K_GOT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0, 0xffffffff,false),
78 HOWTO(R_68K_GOT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0, 0x0000ffff,false),
79 HOWTO(R_68K_GOT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0, 0x000000ff,false),
80 HOWTO(R_68K_PLT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0, 0xffffffff,true),
81 HOWTO(R_68K_PLT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0, 0x0000ffff,true),
82 HOWTO(R_68K_PLT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0, 0x000000ff,true),
83 HOWTO(R_68K_PLT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0, 0xffffffff,false),
84 HOWTO(R_68K_PLT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0, 0x0000ffff,false),
85 HOWTO(R_68K_PLT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", false, 0, 0x000000ff,false),
86 HOWTO(R_68K_COPY, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", false, 0, 0xffffffff,false),
87 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),
88 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),
89 HOWTO(R_68K_RELATIVE, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", false, 0, 0xffffffff,false),
90 /* GNU extension to record C++ vtable hierarchy */
91 HOWTO (R_68K_GNU_VTINHERIT, /* type */
92 0, /* rightshift */
93 2, /* size (0 = byte, 1 = short, 2 = long) */
94 0, /* bitsize */
95 false, /* pc_relative */
96 0, /* bitpos */
97 complain_overflow_dont, /* complain_on_overflow */
98 NULL, /* special_function */
99 "R_68K_GNU_VTINHERIT", /* name */
100 false, /* partial_inplace */
101 0, /* src_mask */
102 0, /* dst_mask */
103 false),
104 /* GNU extension to record C++ vtable member usage */
105 HOWTO (R_68K_GNU_VTENTRY, /* type */
106 0, /* rightshift */
107 2, /* size (0 = byte, 1 = short, 2 = long) */
108 0, /* bitsize */
109 false, /* pc_relative */
110 0, /* bitpos */
111 complain_overflow_dont, /* complain_on_overflow */
112 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
113 "R_68K_GNU_VTENTRY", /* name */
114 false, /* partial_inplace */
115 0, /* src_mask */
116 0, /* dst_mask */
117 false),
118 };
119
120 static void
121 rtype_to_howto (abfd, cache_ptr, dst)
122 bfd *abfd ATTRIBUTE_UNUSED;
123 arelent *cache_ptr;
124 Elf_Internal_Rela *dst;
125 {
126 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max);
127 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
128 }
129
130 #define elf_info_to_howto rtype_to_howto
131
132 static const struct
133 {
134 bfd_reloc_code_real_type bfd_val;
135 int elf_val;
136 } reloc_map[] = {
137 { BFD_RELOC_NONE, R_68K_NONE },
138 { BFD_RELOC_32, R_68K_32 },
139 { BFD_RELOC_16, R_68K_16 },
140 { BFD_RELOC_8, R_68K_8 },
141 { BFD_RELOC_32_PCREL, R_68K_PC32 },
142 { BFD_RELOC_16_PCREL, R_68K_PC16 },
143 { BFD_RELOC_8_PCREL, R_68K_PC8 },
144 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 },
145 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 },
146 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 },
147 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O },
148 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O },
149 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O },
150 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 },
151 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 },
152 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 },
153 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O },
154 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O },
155 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O },
156 { BFD_RELOC_NONE, R_68K_COPY },
157 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT },
158 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT },
159 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE },
160 { BFD_RELOC_CTOR, R_68K_32 },
161 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT },
162 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY },
163 };
164
165 static reloc_howto_type *
166 reloc_type_lookup (abfd, code)
167 bfd *abfd ATTRIBUTE_UNUSED;
168 bfd_reloc_code_real_type code;
169 {
170 unsigned int i;
171 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
172 {
173 if (reloc_map[i].bfd_val == code)
174 return &howto_table[reloc_map[i].elf_val];
175 }
176 return 0;
177 }
178
179 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
180 #define ELF_ARCH bfd_arch_m68k
181 /* end code generated by elf.el */
182
183 #define USE_RELA
184
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
936 /* Adjust a symbol defined by a dynamic object and referenced by a
937 regular object. The current definition is in some section of the
938 dynamic object, but we're not including those sections. We have to
939 change the definition to something the rest of the link can
940 understand. */
941
942 static boolean
943 elf_m68k_adjust_dynamic_symbol (info, h)
944 struct bfd_link_info *info;
945 struct elf_link_hash_entry *h;
946 {
947 bfd *dynobj;
948 asection *s;
949 unsigned int power_of_two;
950
951 dynobj = elf_hash_table (info)->dynobj;
952
953 /* Make sure we know what is going on here. */
954 BFD_ASSERT (dynobj != NULL
955 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
956 || h->weakdef != NULL
957 || ((h->elf_link_hash_flags
958 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
959 && (h->elf_link_hash_flags
960 & ELF_LINK_HASH_REF_REGULAR) != 0
961 && (h->elf_link_hash_flags
962 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
963
964 /* If this is a function, put it in the procedure linkage table. We
965 will fill in the contents of the procedure linkage table later,
966 when we know the address of the .got section. */
967 if (h->type == STT_FUNC
968 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
969 {
970 if (! info->shared
971 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
972 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
973 /* We must always create the plt entry if it was referenced
974 by a PLTxxO relocation. In this case we already recorded
975 it as a dynamic symbol. */
976 && h->dynindx == -1)
977 {
978 /* This case can occur if we saw a PLTxx reloc in an input
979 file, but the symbol was never referred to by a dynamic
980 object. In such a case, we don't actually need to build
981 a procedure linkage table, and we can just do a PCxx
982 reloc instead. */
983 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
984 h->plt.offset = (bfd_vma) -1;
985 return true;
986 }
987
988 /* GC may have rendered this entry unused. */
989 if (h->plt.refcount <= 0)
990 {
991 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
992 h->plt.offset = (bfd_vma) -1;
993 return true;
994 }
995
996 /* Make sure this symbol is output as a dynamic symbol. */
997 if (h->dynindx == -1)
998 {
999 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1000 return false;
1001 }
1002
1003 s = bfd_get_section_by_name (dynobj, ".plt");
1004 BFD_ASSERT (s != NULL);
1005
1006 /* If this is the first .plt entry, make room for the special
1007 first entry. */
1008 if (s->_raw_size == 0)
1009 {
1010 if (CPU32_FLAG (dynobj))
1011 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1012 else
1013 s->_raw_size += PLT_ENTRY_SIZE;
1014 }
1015
1016 /* If this symbol is not defined in a regular file, and we are
1017 not generating a shared library, then set the symbol to this
1018 location in the .plt. This is required to make function
1019 pointers compare as equal between the normal executable and
1020 the shared library. */
1021 if (!info->shared
1022 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1023 {
1024 h->root.u.def.section = s;
1025 h->root.u.def.value = s->_raw_size;
1026 }
1027
1028 h->plt.offset = s->_raw_size;
1029
1030 /* Make room for this entry. */
1031 if (CPU32_FLAG (dynobj))
1032 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1033 else
1034 s->_raw_size += PLT_ENTRY_SIZE;
1035
1036 /* We also need to make an entry in the .got.plt section, which
1037 will be placed in the .got section by the linker script. */
1038
1039 s = bfd_get_section_by_name (dynobj, ".got.plt");
1040 BFD_ASSERT (s != NULL);
1041 s->_raw_size += 4;
1042
1043 /* We also need to make an entry in the .rela.plt section. */
1044
1045 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1046 BFD_ASSERT (s != NULL);
1047 s->_raw_size += sizeof (Elf32_External_Rela);
1048
1049 return true;
1050 }
1051
1052 /* Reinitialize the plt offset now that it is not used as a reference
1053 count any more. */
1054 h->plt.offset = (bfd_vma) -1;
1055
1056 /* If this is a weak symbol, and there is a real definition, the
1057 processor independent code will have arranged for us to see the
1058 real definition first, and we can just use the same value. */
1059 if (h->weakdef != NULL)
1060 {
1061 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1062 || h->weakdef->root.type == bfd_link_hash_defweak);
1063 h->root.u.def.section = h->weakdef->root.u.def.section;
1064 h->root.u.def.value = h->weakdef->root.u.def.value;
1065 return true;
1066 }
1067
1068 /* This is a reference to a symbol defined by a dynamic object which
1069 is not a function. */
1070
1071 /* If we are creating a shared library, we must presume that the
1072 only references to the symbol are via the global offset table.
1073 For such cases we need not do anything here; the relocations will
1074 be handled correctly by relocate_section. */
1075 if (info->shared)
1076 return true;
1077
1078 /* We must allocate the symbol in our .dynbss section, which will
1079 become part of the .bss section of the executable. There will be
1080 an entry for this symbol in the .dynsym section. The dynamic
1081 object will contain position independent code, so all references
1082 from the dynamic object to this symbol will go through the global
1083 offset table. The dynamic linker will use the .dynsym entry to
1084 determine the address it must put in the global offset table, so
1085 both the dynamic object and the regular object will refer to the
1086 same memory location for the variable. */
1087
1088 s = bfd_get_section_by_name (dynobj, ".dynbss");
1089 BFD_ASSERT (s != NULL);
1090
1091 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1092 copy the initial value out of the dynamic object and into the
1093 runtime process image. We need to remember the offset into the
1094 .rela.bss section we are going to use. */
1095 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1096 {
1097 asection *srel;
1098
1099 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1100 BFD_ASSERT (srel != NULL);
1101 srel->_raw_size += sizeof (Elf32_External_Rela);
1102 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1103 }
1104
1105 /* We need to figure out the alignment required for this symbol. I
1106 have no idea how ELF linkers handle this. */
1107 power_of_two = bfd_log2 (h->size);
1108 if (power_of_two > 3)
1109 power_of_two = 3;
1110
1111 /* Apply the required alignment. */
1112 s->_raw_size = BFD_ALIGN (s->_raw_size,
1113 (bfd_size_type) (1 << power_of_two));
1114 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1115 {
1116 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1117 return false;
1118 }
1119
1120 /* Define the symbol as being at this point in the section. */
1121 h->root.u.def.section = s;
1122 h->root.u.def.value = s->_raw_size;
1123
1124 /* Increment the section size to make room for the symbol. */
1125 s->_raw_size += h->size;
1126
1127 return true;
1128 }
1129
1130 /* Set the sizes of the dynamic sections. */
1131
1132 static boolean
1133 elf_m68k_size_dynamic_sections (output_bfd, info)
1134 bfd *output_bfd;
1135 struct bfd_link_info *info;
1136 {
1137 bfd *dynobj;
1138 asection *s;
1139 boolean plt;
1140 boolean relocs;
1141 boolean reltext;
1142
1143 dynobj = elf_hash_table (info)->dynobj;
1144 BFD_ASSERT (dynobj != NULL);
1145
1146 if (elf_hash_table (info)->dynamic_sections_created)
1147 {
1148 /* Set the contents of the .interp section to the interpreter. */
1149 if (!info->shared)
1150 {
1151 s = bfd_get_section_by_name (dynobj, ".interp");
1152 BFD_ASSERT (s != NULL);
1153 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1154 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1155 }
1156 }
1157 else
1158 {
1159 /* We may have created entries in the .rela.got section.
1160 However, if we are not creating the dynamic sections, we will
1161 not actually use these entries. Reset the size of .rela.got,
1162 which will cause it to get stripped from the output file
1163 below. */
1164 s = bfd_get_section_by_name (dynobj, ".rela.got");
1165 if (s != NULL)
1166 s->_raw_size = 0;
1167 }
1168
1169 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1170 relative relocs against symbols defined in a regular object. We
1171 allocated space for them in the check_relocs routine, but we will not
1172 fill them in in the relocate_section routine. */
1173 if (info->shared && info->symbolic)
1174 elf_m68k_link_hash_traverse (elf_m68k_hash_table (info),
1175 elf_m68k_discard_copies,
1176 (PTR) NULL);
1177
1178 /* The check_relocs and adjust_dynamic_symbol entry points have
1179 determined the sizes of the various dynamic sections. Allocate
1180 memory for them. */
1181 plt = false;
1182 relocs = false;
1183 reltext = false;
1184 for (s = dynobj->sections; s != NULL; s = s->next)
1185 {
1186 const char *name;
1187 boolean strip;
1188
1189 if ((s->flags & SEC_LINKER_CREATED) == 0)
1190 continue;
1191
1192 /* It's OK to base decisions on the section name, because none
1193 of the dynobj section names depend upon the input files. */
1194 name = bfd_get_section_name (dynobj, s);
1195
1196 strip = false;
1197
1198 if (strcmp (name, ".plt") == 0)
1199 {
1200 if (s->_raw_size == 0)
1201 {
1202 /* Strip this section if we don't need it; see the
1203 comment below. */
1204 strip = true;
1205 }
1206 else
1207 {
1208 /* Remember whether there is a PLT. */
1209 plt = true;
1210 }
1211 }
1212 else if (strncmp (name, ".rela", 5) == 0)
1213 {
1214 if (s->_raw_size == 0)
1215 {
1216 /* If we don't need this section, strip it from the
1217 output file. This is mostly to handle .rela.bss and
1218 .rela.plt. We must create both sections in
1219 create_dynamic_sections, because they must be created
1220 before the linker maps input sections to output
1221 sections. The linker does that before
1222 adjust_dynamic_symbol is called, and it is that
1223 function which decides whether anything needs to go
1224 into these sections. */
1225 strip = true;
1226 }
1227 else
1228 {
1229 asection *target;
1230
1231 /* Remember whether there are any reloc sections other
1232 than .rela.plt. */
1233 if (strcmp (name, ".rela.plt") != 0)
1234 {
1235 const char *outname;
1236
1237 relocs = true;
1238
1239 /* If this relocation section applies to a read only
1240 section, then we probably need a DT_TEXTREL
1241 entry. .rela.plt is actually associated with
1242 .got.plt, which is never readonly. */
1243 outname = bfd_get_section_name (output_bfd,
1244 s->output_section);
1245 target = bfd_get_section_by_name (output_bfd, outname + 5);
1246 if (target != NULL
1247 && (target->flags & SEC_READONLY) != 0
1248 && (target->flags & SEC_ALLOC) != 0)
1249 reltext = true;
1250 }
1251
1252 /* We use the reloc_count field as a counter if we need
1253 to copy relocs into the output file. */
1254 s->reloc_count = 0;
1255 }
1256 }
1257 else if (strncmp (name, ".got", 4) != 0)
1258 {
1259 /* It's not one of our sections, so don't allocate space. */
1260 continue;
1261 }
1262
1263 if (strip)
1264 {
1265 _bfd_strip_section_from_output (info, s);
1266 continue;
1267 }
1268
1269 /* Allocate memory for the section contents. */
1270 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1271 Unused entries should be reclaimed before the section's contents
1272 are written out, but at the moment this does not happen. Thus in
1273 order to prevent writing out garbage, we initialise the section's
1274 contents to zero. */
1275 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1276 if (s->contents == NULL && s->_raw_size != 0)
1277 return false;
1278 }
1279
1280 if (elf_hash_table (info)->dynamic_sections_created)
1281 {
1282 /* Add some entries to the .dynamic section. We fill in the
1283 values later, in elf_m68k_finish_dynamic_sections, but we
1284 must add the entries now so that we get the correct size for
1285 the .dynamic section. The DT_DEBUG entry is filled in by the
1286 dynamic linker and used by the debugger. */
1287 if (!info->shared)
1288 {
1289 if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
1290 return false;
1291 }
1292
1293 if (plt)
1294 {
1295 if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
1296 || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
1297 || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
1298 || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
1299 return false;
1300 }
1301
1302 if (relocs)
1303 {
1304 if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
1305 || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
1306 || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
1307 sizeof (Elf32_External_Rela)))
1308 return false;
1309 }
1310
1311 if (reltext)
1312 {
1313 if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
1314 return false;
1315 info->flags |= DF_TEXTREL;
1316 }
1317 }
1318
1319 return true;
1320 }
1321
1322 /* This function is called via elf_m68k_link_hash_traverse if we are
1323 creating a shared object with -Bsymbolic. It discards the space
1324 allocated to copy PC relative relocs against symbols which are defined
1325 in regular objects. We allocated space for them in the check_relocs
1326 routine, but we won't fill them in in the relocate_section routine. */
1327
1328 /*ARGSUSED*/
1329 static boolean
1330 elf_m68k_discard_copies (h, ignore)
1331 struct elf_m68k_link_hash_entry *h;
1332 PTR ignore ATTRIBUTE_UNUSED;
1333 {
1334 struct elf_m68k_pcrel_relocs_copied *s;
1335
1336 /* We only discard relocs for symbols defined in a regular object. */
1337 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1338 return true;
1339
1340 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1341 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1342
1343 return true;
1344 }
1345
1346 /* Relocate an M68K ELF section. */
1347
1348 static boolean
1349 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1350 contents, relocs, local_syms, local_sections)
1351 bfd *output_bfd;
1352 struct bfd_link_info *info;
1353 bfd *input_bfd;
1354 asection *input_section;
1355 bfd_byte *contents;
1356 Elf_Internal_Rela *relocs;
1357 Elf_Internal_Sym *local_syms;
1358 asection **local_sections;
1359 {
1360 bfd *dynobj;
1361 Elf_Internal_Shdr *symtab_hdr;
1362 struct elf_link_hash_entry **sym_hashes;
1363 bfd_vma *local_got_offsets;
1364 asection *sgot;
1365 asection *splt;
1366 asection *sreloc;
1367 Elf_Internal_Rela *rel;
1368 Elf_Internal_Rela *relend;
1369
1370 dynobj = elf_hash_table (info)->dynobj;
1371 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1372 sym_hashes = elf_sym_hashes (input_bfd);
1373 local_got_offsets = elf_local_got_offsets (input_bfd);
1374
1375 sgot = NULL;
1376 splt = NULL;
1377 sreloc = NULL;
1378
1379 rel = relocs;
1380 relend = relocs + input_section->reloc_count;
1381 for (; rel < relend; rel++)
1382 {
1383 int r_type;
1384 reloc_howto_type *howto;
1385 unsigned long r_symndx;
1386 struct elf_link_hash_entry *h;
1387 Elf_Internal_Sym *sym;
1388 asection *sec;
1389 bfd_vma relocation;
1390 bfd_reloc_status_type r;
1391
1392 r_type = ELF32_R_TYPE (rel->r_info);
1393 if (r_type < 0 || r_type >= (int) R_68K_max)
1394 {
1395 bfd_set_error (bfd_error_bad_value);
1396 return false;
1397 }
1398 howto = howto_table + r_type;
1399
1400 r_symndx = ELF32_R_SYM (rel->r_info);
1401
1402 if (info->relocateable)
1403 {
1404 /* This is a relocateable link. We don't have to change
1405 anything, unless the reloc is against a section symbol,
1406 in which case we have to adjust according to where the
1407 section symbol winds up in the output section. */
1408 if (r_symndx < symtab_hdr->sh_info)
1409 {
1410 sym = local_syms + r_symndx;
1411 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1412 {
1413 sec = local_sections[r_symndx];
1414 rel->r_addend += sec->output_offset + sym->st_value;
1415 }
1416 }
1417
1418 continue;
1419 }
1420
1421 /* This is a final link. */
1422 h = NULL;
1423 sym = NULL;
1424 sec = NULL;
1425 if (r_symndx < symtab_hdr->sh_info)
1426 {
1427 sym = local_syms + r_symndx;
1428 sec = local_sections[r_symndx];
1429 relocation = (sec->output_section->vma
1430 + sec->output_offset
1431 + sym->st_value);
1432 }
1433 else
1434 {
1435 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1436 while (h->root.type == bfd_link_hash_indirect
1437 || h->root.type == bfd_link_hash_warning)
1438 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1439 if (h->root.type == bfd_link_hash_defined
1440 || h->root.type == bfd_link_hash_defweak)
1441 {
1442 sec = h->root.u.def.section;
1443 if (((r_type == R_68K_PLT8
1444 || r_type == R_68K_PLT16
1445 || r_type == R_68K_PLT32
1446 || r_type == R_68K_PLT8O
1447 || r_type == R_68K_PLT16O
1448 || r_type == R_68K_PLT32O)
1449 && h->plt.offset != (bfd_vma) -1
1450 && elf_hash_table (info)->dynamic_sections_created)
1451 || ((r_type == R_68K_GOT8O
1452 || r_type == R_68K_GOT16O
1453 || r_type == R_68K_GOT32O
1454 || ((r_type == R_68K_GOT8
1455 || r_type == R_68K_GOT16
1456 || r_type == R_68K_GOT32)
1457 && strcmp (h->root.root.string,
1458 "_GLOBAL_OFFSET_TABLE_") != 0))
1459 && elf_hash_table (info)->dynamic_sections_created
1460 && (! info->shared
1461 || (! info->symbolic && h->dynindx != -1)
1462 || (h->elf_link_hash_flags
1463 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1464 || (info->shared
1465 && ((! info->symbolic && h->dynindx != -1)
1466 || (h->elf_link_hash_flags
1467 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1468 && (input_section->flags & SEC_ALLOC) != 0
1469 && (r_type == R_68K_8
1470 || r_type == R_68K_16
1471 || r_type == R_68K_32
1472 || r_type == R_68K_PC8
1473 || r_type == R_68K_PC16
1474 || r_type == R_68K_PC32)))
1475 {
1476 /* In these cases, we don't need the relocation
1477 value. We check specially because in some
1478 obscure cases sec->output_section will be NULL. */
1479 relocation = 0;
1480 }
1481 else
1482 relocation = (h->root.u.def.value
1483 + sec->output_section->vma
1484 + sec->output_offset);
1485 }
1486 else if (h->root.type == bfd_link_hash_undefweak)
1487 relocation = 0;
1488 else if (info->shared && !info->symbolic
1489 && !info->no_undefined
1490 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1491 relocation = 0;
1492 else
1493 {
1494 if (!(info->callbacks->undefined_symbol
1495 (info, h->root.root.string, input_bfd,
1496 input_section, rel->r_offset,
1497 (!info->shared || info->no_undefined
1498 || ELF_ST_VISIBILITY (h->other)))))
1499 return false;
1500 relocation = 0;
1501 }
1502 }
1503
1504 switch (r_type)
1505 {
1506 case R_68K_GOT8:
1507 case R_68K_GOT16:
1508 case R_68K_GOT32:
1509 /* Relocation is to the address of the entry for this symbol
1510 in the global offset table. */
1511 if (h != NULL
1512 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1513 break;
1514 /* Fall through. */
1515 case R_68K_GOT8O:
1516 case R_68K_GOT16O:
1517 case R_68K_GOT32O:
1518 /* Relocation is the offset of the entry for this symbol in
1519 the global offset table. */
1520
1521 {
1522 bfd_vma off;
1523
1524 if (sgot == NULL)
1525 {
1526 sgot = bfd_get_section_by_name (dynobj, ".got");
1527 BFD_ASSERT (sgot != NULL);
1528 }
1529
1530 if (h != NULL)
1531 {
1532 off = h->got.offset;
1533 BFD_ASSERT (off != (bfd_vma) -1);
1534
1535 if (!elf_hash_table (info)->dynamic_sections_created
1536 || (info->shared
1537 && (info->symbolic || h->dynindx == -1)
1538 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1539 {
1540 /* This is actually a static link, or it is a
1541 -Bsymbolic link and the symbol is defined
1542 locally, or the symbol was forced to be local
1543 because of a version file.. We must initialize
1544 this entry in the global offset table. Since
1545 the offset must always be a multiple of 4, we
1546 use the least significant bit to record whether
1547 we have initialized it already.
1548
1549 When doing a dynamic link, we create a .rela.got
1550 relocation entry to initialize the value. This
1551 is done in the finish_dynamic_symbol routine. */
1552 if ((off & 1) != 0)
1553 off &= ~1;
1554 else
1555 {
1556 bfd_put_32 (output_bfd, relocation,
1557 sgot->contents + off);
1558 h->got.offset |= 1;
1559 }
1560 }
1561 }
1562 else
1563 {
1564 BFD_ASSERT (local_got_offsets != NULL
1565 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1566
1567 off = local_got_offsets[r_symndx];
1568
1569 /* The offset must always be a multiple of 4. We use
1570 the least significant bit to record whether we have
1571 already generated the necessary reloc. */
1572 if ((off & 1) != 0)
1573 off &= ~1;
1574 else
1575 {
1576 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1577
1578 if (info->shared)
1579 {
1580 asection *srelgot;
1581 Elf_Internal_Rela outrel;
1582
1583 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1584 BFD_ASSERT (srelgot != NULL);
1585
1586 outrel.r_offset = (sgot->output_section->vma
1587 + sgot->output_offset
1588 + off);
1589 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1590 outrel.r_addend = relocation;
1591 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1592 (((Elf32_External_Rela *)
1593 srelgot->contents)
1594 + srelgot->reloc_count));
1595 ++srelgot->reloc_count;
1596 }
1597
1598 local_got_offsets[r_symndx] |= 1;
1599 }
1600 }
1601
1602 relocation = sgot->output_offset + off;
1603 if (r_type == R_68K_GOT8O
1604 || r_type == R_68K_GOT16O
1605 || r_type == R_68K_GOT32O)
1606 {
1607 /* This relocation does not use the addend. */
1608 rel->r_addend = 0;
1609 }
1610 else
1611 relocation += sgot->output_section->vma;
1612 }
1613 break;
1614
1615 case R_68K_PLT8:
1616 case R_68K_PLT16:
1617 case R_68K_PLT32:
1618 /* Relocation is to the entry for this symbol in the
1619 procedure linkage table. */
1620
1621 /* Resolve a PLTxx reloc against a local symbol directly,
1622 without using the procedure linkage table. */
1623 if (h == NULL)
1624 break;
1625
1626 if (h->plt.offset == (bfd_vma) -1
1627 || !elf_hash_table (info)->dynamic_sections_created)
1628 {
1629 /* We didn't make a PLT entry for this symbol. This
1630 happens when statically linking PIC code, or when
1631 using -Bsymbolic. */
1632 break;
1633 }
1634
1635 if (splt == NULL)
1636 {
1637 splt = bfd_get_section_by_name (dynobj, ".plt");
1638 BFD_ASSERT (splt != NULL);
1639 }
1640
1641 relocation = (splt->output_section->vma
1642 + splt->output_offset
1643 + h->plt.offset);
1644 break;
1645
1646 case R_68K_PLT8O:
1647 case R_68K_PLT16O:
1648 case R_68K_PLT32O:
1649 /* Relocation is the offset of the entry for this symbol in
1650 the procedure linkage table. */
1651 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1652
1653 if (splt == NULL)
1654 {
1655 splt = bfd_get_section_by_name (dynobj, ".plt");
1656 BFD_ASSERT (splt != NULL);
1657 }
1658
1659 relocation = h->plt.offset;
1660
1661 /* This relocation does not use the addend. */
1662 rel->r_addend = 0;
1663
1664 break;
1665
1666 case R_68K_PC8:
1667 case R_68K_PC16:
1668 case R_68K_PC32:
1669 if (h == NULL)
1670 break;
1671 /* Fall through. */
1672 case R_68K_8:
1673 case R_68K_16:
1674 case R_68K_32:
1675 if (info->shared
1676 && (input_section->flags & SEC_ALLOC) != 0
1677 && ((r_type != R_68K_PC8
1678 && r_type != R_68K_PC16
1679 && r_type != R_68K_PC32)
1680 || (!info->symbolic
1681 || (h->elf_link_hash_flags
1682 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1683 {
1684 Elf_Internal_Rela outrel;
1685 boolean skip, relocate;
1686
1687 /* When generating a shared object, these relocations
1688 are copied into the output file to be resolved at run
1689 time. */
1690
1691 if (sreloc == NULL)
1692 {
1693 const char *name;
1694
1695 name = (bfd_elf_string_from_elf_section
1696 (input_bfd,
1697 elf_elfheader (input_bfd)->e_shstrndx,
1698 elf_section_data (input_section)->rel_hdr.sh_name));
1699 if (name == NULL)
1700 return false;
1701
1702 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1703 && strcmp (bfd_get_section_name (input_bfd,
1704 input_section),
1705 name + 5) == 0);
1706
1707 sreloc = bfd_get_section_by_name (dynobj, name);
1708 BFD_ASSERT (sreloc != NULL);
1709 }
1710
1711 skip = false;
1712
1713 if (elf_section_data (input_section)->stab_info == NULL)
1714 outrel.r_offset = rel->r_offset;
1715 else
1716 {
1717 bfd_vma off;
1718
1719 off = (_bfd_stab_section_offset
1720 (output_bfd, &elf_hash_table (info)->stab_info,
1721 input_section,
1722 &elf_section_data (input_section)->stab_info,
1723 rel->r_offset));
1724 if (off == (bfd_vma) -1)
1725 skip = true;
1726 outrel.r_offset = off;
1727 }
1728
1729 outrel.r_offset += (input_section->output_section->vma
1730 + input_section->output_offset);
1731
1732 if (skip)
1733 {
1734 memset (&outrel, 0, sizeof outrel);
1735 relocate = false;
1736 }
1737 /* h->dynindx may be -1 if the symbol was marked to
1738 become local. */
1739 else if (h != NULL
1740 && ((! info->symbolic && h->dynindx != -1)
1741 || (h->elf_link_hash_flags
1742 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1743 {
1744 BFD_ASSERT (h->dynindx != -1);
1745 relocate = false;
1746 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1747 outrel.r_addend = relocation + rel->r_addend;
1748 }
1749 else
1750 {
1751 if (r_type == R_68K_32)
1752 {
1753 relocate = true;
1754 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1755 outrel.r_addend = relocation + rel->r_addend;
1756 }
1757 else
1758 {
1759 long indx;
1760
1761 if (h == NULL)
1762 sec = local_sections[r_symndx];
1763 else
1764 {
1765 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1766 || (h->root.type
1767 == bfd_link_hash_defweak));
1768 sec = h->root.u.def.section;
1769 }
1770 if (sec != NULL && bfd_is_abs_section (sec))
1771 indx = 0;
1772 else if (sec == NULL || sec->owner == NULL)
1773 {
1774 bfd_set_error (bfd_error_bad_value);
1775 return false;
1776 }
1777 else
1778 {
1779 asection *osec;
1780
1781 osec = sec->output_section;
1782 indx = elf_section_data (osec)->dynindx;
1783 BFD_ASSERT (indx > 0);
1784 }
1785
1786 relocate = false;
1787 outrel.r_info = ELF32_R_INFO (indx, r_type);
1788 outrel.r_addend = relocation + rel->r_addend;
1789 }
1790 }
1791
1792 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1793 (((Elf32_External_Rela *)
1794 sreloc->contents)
1795 + sreloc->reloc_count));
1796 ++sreloc->reloc_count;
1797
1798 /* This reloc will be computed at runtime, so there's no
1799 need to do anything now, except for R_68K_32
1800 relocations that have been turned into
1801 R_68K_RELATIVE. */
1802 if (!relocate)
1803 continue;
1804 }
1805
1806 break;
1807
1808 case R_68K_GNU_VTINHERIT:
1809 case R_68K_GNU_VTENTRY:
1810 /* These are no-ops in the end. */
1811 continue;
1812
1813 default:
1814 break;
1815 }
1816
1817 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1818 contents, rel->r_offset,
1819 relocation, rel->r_addend);
1820
1821 if (r != bfd_reloc_ok)
1822 {
1823 switch (r)
1824 {
1825 default:
1826 case bfd_reloc_outofrange:
1827 abort ();
1828 case bfd_reloc_overflow:
1829 {
1830 const char *name;
1831
1832 if (h != NULL)
1833 name = h->root.root.string;
1834 else
1835 {
1836 name = bfd_elf_string_from_elf_section (input_bfd,
1837 symtab_hdr->sh_link,
1838 sym->st_name);
1839 if (name == NULL)
1840 return false;
1841 if (*name == '\0')
1842 name = bfd_section_name (input_bfd, sec);
1843 }
1844 if (!(info->callbacks->reloc_overflow
1845 (info, name, howto->name, (bfd_vma) 0,
1846 input_bfd, input_section, rel->r_offset)))
1847 return false;
1848 }
1849 break;
1850 }
1851 }
1852 }
1853
1854 return true;
1855 }
1856
1857 /* Finish up dynamic symbol handling. We set the contents of various
1858 dynamic sections here. */
1859
1860 static boolean
1861 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1862 bfd *output_bfd;
1863 struct bfd_link_info *info;
1864 struct elf_link_hash_entry *h;
1865 Elf_Internal_Sym *sym;
1866 {
1867 bfd *dynobj;
1868 int plt_off1, plt_off2, plt_off3;
1869
1870 dynobj = elf_hash_table (info)->dynobj;
1871
1872 if (h->plt.offset != (bfd_vma) -1)
1873 {
1874 asection *splt;
1875 asection *sgot;
1876 asection *srela;
1877 bfd_vma plt_index;
1878 bfd_vma got_offset;
1879 Elf_Internal_Rela rela;
1880
1881 /* This symbol has an entry in the procedure linkage table. Set
1882 it up. */
1883
1884 BFD_ASSERT (h->dynindx != -1);
1885
1886 splt = bfd_get_section_by_name (dynobj, ".plt");
1887 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1888 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1889 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1890
1891 /* Get the index in the procedure linkage table which
1892 corresponds to this symbol. This is the index of this symbol
1893 in all the symbols for which we are making plt entries. The
1894 first entry in the procedure linkage table is reserved. */
1895 if ( CPU32_FLAG (output_bfd))
1896 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1897 else
1898 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1899
1900 /* Get the offset into the .got table of the entry that
1901 corresponds to this function. Each .got entry is 4 bytes.
1902 The first three are reserved. */
1903 got_offset = (plt_index + 3) * 4;
1904
1905 if ( CPU32_FLAG (output_bfd))
1906 {
1907 /* Fill in the entry in the procedure linkage table. */
1908 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1909 PLT_CPU32_ENTRY_SIZE);
1910 plt_off1 = 4;
1911 plt_off2 = 12;
1912 plt_off3 = 18;
1913 }
1914 else
1915 {
1916 /* Fill in the entry in the procedure linkage table. */
1917 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1918 PLT_ENTRY_SIZE);
1919 plt_off1 = 4;
1920 plt_off2 = 10;
1921 plt_off3 = 16;
1922 }
1923
1924 /* The offset is relative to the first extension word. */
1925 bfd_put_32 (output_bfd,
1926 (sgot->output_section->vma
1927 + sgot->output_offset
1928 + got_offset
1929 - (splt->output_section->vma
1930 + h->plt.offset + 2)),
1931 splt->contents + h->plt.offset + plt_off1);
1932
1933 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1934 splt->contents + h->plt.offset + plt_off2);
1935 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1936 splt->contents + h->plt.offset + plt_off3);
1937
1938 /* Fill in the entry in the global offset table. */
1939 bfd_put_32 (output_bfd,
1940 (splt->output_section->vma
1941 + splt->output_offset
1942 + h->plt.offset
1943 + 8),
1944 sgot->contents + got_offset);
1945
1946 /* Fill in the entry in the .rela.plt section. */
1947 rela.r_offset = (sgot->output_section->vma
1948 + sgot->output_offset
1949 + got_offset);
1950 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1951 rela.r_addend = 0;
1952 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1953 ((Elf32_External_Rela *) srela->contents
1954 + plt_index));
1955
1956 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1957 {
1958 /* Mark the symbol as undefined, rather than as defined in
1959 the .plt section. Leave the value alone. */
1960 sym->st_shndx = SHN_UNDEF;
1961 }
1962 }
1963
1964 if (h->got.offset != (bfd_vma) -1)
1965 {
1966 asection *sgot;
1967 asection *srela;
1968 Elf_Internal_Rela rela;
1969
1970 /* This symbol has an entry in the global offset table. Set it
1971 up. */
1972
1973 sgot = bfd_get_section_by_name (dynobj, ".got");
1974 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1975 BFD_ASSERT (sgot != NULL && srela != NULL);
1976
1977 rela.r_offset = (sgot->output_section->vma
1978 + sgot->output_offset
1979 + (h->got.offset &~ 1));
1980
1981 /* If this is a -Bsymbolic link, and the symbol is defined
1982 locally, we just want to emit a RELATIVE reloc. Likewise if
1983 the symbol was forced to be local because of a version file.
1984 The entry in the global offset table will already have been
1985 initialized in the relocate_section function. */
1986 if (info->shared
1987 && (info->symbolic || h->dynindx == -1)
1988 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1989 {
1990 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1991 rela.r_addend = bfd_get_signed_32 (output_bfd,
1992 (sgot->contents
1993 + (h->got.offset & ~1)));
1994 }
1995 else
1996 {
1997 bfd_put_32 (output_bfd, (bfd_vma) 0,
1998 sgot->contents + (h->got.offset & ~1));
1999 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
2000 rela.r_addend = 0;
2001 }
2002
2003 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2004 ((Elf32_External_Rela *) srela->contents
2005 + srela->reloc_count));
2006 ++srela->reloc_count;
2007 }
2008
2009 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2010 {
2011 asection *s;
2012 Elf_Internal_Rela rela;
2013
2014 /* This symbol needs a copy reloc. Set it up. */
2015
2016 BFD_ASSERT (h->dynindx != -1
2017 && (h->root.type == bfd_link_hash_defined
2018 || h->root.type == bfd_link_hash_defweak));
2019
2020 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2021 ".rela.bss");
2022 BFD_ASSERT (s != NULL);
2023
2024 rela.r_offset = (h->root.u.def.value
2025 + h->root.u.def.section->output_section->vma
2026 + h->root.u.def.section->output_offset);
2027 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
2028 rela.r_addend = 0;
2029 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2030 ((Elf32_External_Rela *) s->contents
2031 + s->reloc_count));
2032 ++s->reloc_count;
2033 }
2034
2035 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2036 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2037 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2038 sym->st_shndx = SHN_ABS;
2039
2040 return true;
2041 }
2042
2043 /* Finish up the dynamic sections. */
2044
2045 static boolean
2046 elf_m68k_finish_dynamic_sections (output_bfd, info)
2047 bfd *output_bfd;
2048 struct bfd_link_info *info;
2049 {
2050 bfd *dynobj;
2051 asection *sgot;
2052 asection *sdyn;
2053
2054 dynobj = elf_hash_table (info)->dynobj;
2055
2056 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2057 BFD_ASSERT (sgot != NULL);
2058 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2059
2060 if (elf_hash_table (info)->dynamic_sections_created)
2061 {
2062 asection *splt;
2063 Elf32_External_Dyn *dyncon, *dynconend;
2064
2065 splt = bfd_get_section_by_name (dynobj, ".plt");
2066 BFD_ASSERT (splt != NULL && sdyn != NULL);
2067
2068 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2069 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2070 for (; dyncon < dynconend; dyncon++)
2071 {
2072 Elf_Internal_Dyn dyn;
2073 const char *name;
2074 asection *s;
2075
2076 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2077
2078 switch (dyn.d_tag)
2079 {
2080 default:
2081 break;
2082
2083 case DT_PLTGOT:
2084 name = ".got";
2085 goto get_vma;
2086 case DT_JMPREL:
2087 name = ".rela.plt";
2088 get_vma:
2089 s = bfd_get_section_by_name (output_bfd, name);
2090 BFD_ASSERT (s != NULL);
2091 dyn.d_un.d_ptr = s->vma;
2092 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2093 break;
2094
2095 case DT_PLTRELSZ:
2096 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2097 BFD_ASSERT (s != NULL);
2098 if (s->_cooked_size != 0)
2099 dyn.d_un.d_val = s->_cooked_size;
2100 else
2101 dyn.d_un.d_val = s->_raw_size;
2102 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2103 break;
2104
2105 case DT_RELASZ:
2106 /* The procedure linkage table relocs (DT_JMPREL) should
2107 not be included in the overall relocs (DT_RELA).
2108 Therefore, we override the DT_RELASZ entry here to
2109 make it not include the JMPREL relocs. Since the
2110 linker script arranges for .rela.plt to follow all
2111 other relocation sections, we don't have to worry
2112 about changing the DT_RELA entry. */
2113 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2114 if (s != NULL)
2115 {
2116 if (s->_cooked_size != 0)
2117 dyn.d_un.d_val -= s->_cooked_size;
2118 else
2119 dyn.d_un.d_val -= s->_raw_size;
2120 }
2121 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2122 break;
2123 }
2124 }
2125
2126 /* Fill in the first entry in the procedure linkage table. */
2127 if (splt->_raw_size > 0)
2128 {
2129 if (!CPU32_FLAG (output_bfd))
2130 {
2131 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2132 bfd_put_32 (output_bfd,
2133 (sgot->output_section->vma
2134 + sgot->output_offset + 4
2135 - (splt->output_section->vma + 2)),
2136 splt->contents + 4);
2137 bfd_put_32 (output_bfd,
2138 (sgot->output_section->vma
2139 + sgot->output_offset + 8
2140 - (splt->output_section->vma + 10)),
2141 splt->contents + 12);
2142 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2143 = PLT_ENTRY_SIZE;
2144 }
2145 else /* cpu32 */
2146 {
2147 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2148 bfd_put_32 (output_bfd,
2149 (sgot->output_section->vma
2150 + sgot->output_offset + 4
2151 - (splt->output_section->vma + 2)),
2152 splt->contents + 4);
2153 bfd_put_32 (output_bfd,
2154 (sgot->output_section->vma
2155 + sgot->output_offset + 8
2156 - (splt->output_section->vma + 10)),
2157 splt->contents + 12);
2158 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2159 = PLT_CPU32_ENTRY_SIZE;
2160 }
2161 }
2162 }
2163
2164 /* Fill in the first three entries in the global offset table. */
2165 if (sgot->_raw_size > 0)
2166 {
2167 if (sdyn == NULL)
2168 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2169 else
2170 bfd_put_32 (output_bfd,
2171 sdyn->output_section->vma + sdyn->output_offset,
2172 sgot->contents);
2173 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2174 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2175 }
2176
2177 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2178
2179 return true;
2180 }
2181
2182 /* Given a .data section and a .emreloc in-memory section, store
2183 relocation information into the .emreloc section which can be
2184 used at runtime to relocate the section. This is called by the
2185 linker when the --embedded-relocs switch is used. This is called
2186 after the add_symbols entry point has been called for all the
2187 objects, and before the final_link entry point is called. */
2188
2189 boolean
2190 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2191 bfd *abfd;
2192 struct bfd_link_info *info;
2193 asection *datasec;
2194 asection *relsec;
2195 char **errmsg;
2196 {
2197 Elf_Internal_Shdr *symtab_hdr;
2198 Elf32_External_Sym *extsyms;
2199 Elf32_External_Sym *free_extsyms = NULL;
2200 Elf_Internal_Rela *internal_relocs;
2201 Elf_Internal_Rela *free_relocs = NULL;
2202 Elf_Internal_Rela *irel, *irelend;
2203 bfd_byte *p;
2204
2205 BFD_ASSERT (! info->relocateable);
2206
2207 *errmsg = NULL;
2208
2209 if (datasec->reloc_count == 0)
2210 return true;
2211
2212 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2213 /* Read this BFD's symbols if we haven't done so already, or get the cached
2214 copy if it exists. */
2215 if (symtab_hdr->contents != NULL)
2216 extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
2217 else
2218 {
2219 /* Go get them off disk. */
2220 if (info->keep_memory)
2221 extsyms = ((Elf32_External_Sym *)
2222 bfd_alloc (abfd, symtab_hdr->sh_size));
2223 else
2224 extsyms = ((Elf32_External_Sym *)
2225 bfd_malloc (symtab_hdr->sh_size));
2226 if (extsyms == NULL)
2227 goto error_return;
2228 if (! info->keep_memory)
2229 free_extsyms = extsyms;
2230 if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
2231 || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd)
2232 != symtab_hdr->sh_size))
2233 goto error_return;
2234 if (info->keep_memory)
2235 symtab_hdr->contents = extsyms;
2236 }
2237
2238 /* Get a copy of the native relocations. */
2239 internal_relocs = (_bfd_elf32_link_read_relocs
2240 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2241 info->keep_memory));
2242 if (internal_relocs == NULL)
2243 goto error_return;
2244 if (! info->keep_memory)
2245 free_relocs = internal_relocs;
2246
2247 relsec->contents = (bfd_byte *) bfd_alloc (abfd, datasec->reloc_count * 12);
2248 if (relsec->contents == NULL)
2249 goto error_return;
2250
2251 p = relsec->contents;
2252
2253 irelend = internal_relocs + datasec->reloc_count;
2254 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2255 {
2256 asection *targetsec;
2257
2258 /* We are going to write a four byte longword into the runtime
2259 reloc section. The longword will be the address in the data
2260 section which must be relocated. It is followed by the name
2261 of the target section NUL-padded or truncated to 8
2262 characters. */
2263
2264 /* We can only relocate absolute longword relocs at run time. */
2265 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2266 {
2267 *errmsg = _("unsupported reloc type");
2268 bfd_set_error (bfd_error_bad_value);
2269 goto error_return;
2270 }
2271
2272 /* Get the target section referred to by the reloc. */
2273 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2274 {
2275 Elf_Internal_Sym isym;
2276
2277 /* A local symbol. */
2278 bfd_elf32_swap_symbol_in (abfd,
2279 extsyms + ELF32_R_SYM (irel->r_info),
2280 &isym);
2281
2282 targetsec = bfd_section_from_elf_index (abfd, isym.st_shndx);
2283 }
2284 else
2285 {
2286 unsigned long indx;
2287 struct elf_link_hash_entry *h;
2288
2289 /* An external symbol. */
2290 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2291 h = elf_sym_hashes (abfd)[indx];
2292 BFD_ASSERT (h != NULL);
2293 if (h->root.type == bfd_link_hash_defined
2294 || h->root.type == bfd_link_hash_defweak)
2295 targetsec = h->root.u.def.section;
2296 else
2297 targetsec = NULL;
2298 }
2299
2300 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2301 memset (p + 4, 0, 8);
2302 if (targetsec != NULL)
2303 strncpy (p + 4, targetsec->output_section->name, 8);
2304 }
2305
2306 if (free_extsyms != NULL)
2307 free (free_extsyms);
2308 if (free_relocs != NULL)
2309 free (free_relocs);
2310 return true;
2311
2312 error_return:
2313 if (free_extsyms != NULL)
2314 free (free_extsyms);
2315 if (free_relocs != NULL)
2316 free (free_relocs);
2317 return false;
2318 }
2319
2320 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2321 #define TARGET_BIG_NAME "elf32-m68k"
2322 #define ELF_MACHINE_CODE EM_68K
2323 #define ELF_MAXPAGESIZE 0x2000
2324 #define elf_backend_create_dynamic_sections \
2325 _bfd_elf_create_dynamic_sections
2326 #define bfd_elf32_bfd_link_hash_table_create \
2327 elf_m68k_link_hash_table_create
2328 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2329
2330 #define elf_backend_check_relocs elf_m68k_check_relocs
2331 #define elf_backend_adjust_dynamic_symbol \
2332 elf_m68k_adjust_dynamic_symbol
2333 #define elf_backend_size_dynamic_sections \
2334 elf_m68k_size_dynamic_sections
2335 #define elf_backend_relocate_section elf_m68k_relocate_section
2336 #define elf_backend_finish_dynamic_symbol \
2337 elf_m68k_finish_dynamic_symbol
2338 #define elf_backend_finish_dynamic_sections \
2339 elf_m68k_finish_dynamic_sections
2340 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2341 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2342 #define bfd_elf32_bfd_copy_private_bfd_data \
2343 elf32_m68k_copy_private_bfd_data
2344 #define bfd_elf32_bfd_merge_private_bfd_data \
2345 elf32_m68k_merge_private_bfd_data
2346 #define bfd_elf32_bfd_set_private_flags \
2347 elf32_m68k_set_private_flags
2348 #define bfd_elf32_bfd_print_private_bfd_data \
2349 elf32_m68k_print_private_bfd_data
2350
2351 #define elf_backend_can_gc_sections 1
2352 #define elf_backend_want_got_plt 1
2353 #define elf_backend_plt_readonly 1
2354 #define elf_backend_want_plt_sym 0
2355 #define elf_backend_got_header_size 12
2356
2357 #include "elf32-target.h"
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