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* pe-dll.c (make_import_fixup_mark): Avoid type-punned pointer.
[binutils.git] / bfd / elf32-m68k.c
blob2c50ed08b74993e1d8dd9346d17311877e6ebdbd
1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/m68k.h"
27
28 static reloc_howto_type *reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30 static void rtype_to_howto
31 PARAMS ((bfd *, arelent *, 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 ((asection *, 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_merge_private_bfd_data
61 PARAMS ((bfd *, bfd *));
62 static boolean elf32_m68k_print_private_bfd_data
63 PARAMS ((bfd *, PTR));
64 static enum elf_reloc_type_class elf32_m68k_reloc_type_class
65 PARAMS ((const Elf_Internal_Rela *));
66
67 static reloc_howto_type howto_table[] = {
68 HOWTO(R_68K_NONE, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", false, 0, 0x00000000,false),
69 HOWTO(R_68K_32, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0, 0xffffffff,false),
70 HOWTO(R_68K_16, 0, 1,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0, 0x0000ffff,false),
71 HOWTO(R_68K_8, 0, 0, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0, 0x000000ff,false),
72 HOWTO(R_68K_PC32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", false, 0, 0xffffffff,true),
73 HOWTO(R_68K_PC16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0, 0x0000ffff,true),
74 HOWTO(R_68K_PC8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0, 0x000000ff,true),
75 HOWTO(R_68K_GOT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0, 0xffffffff,true),
76 HOWTO(R_68K_GOT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0, 0x0000ffff,true),
77 HOWTO(R_68K_GOT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0, 0x000000ff,true),
78 HOWTO(R_68K_GOT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0, 0xffffffff,false),
79 HOWTO(R_68K_GOT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0, 0x0000ffff,false),
80 HOWTO(R_68K_GOT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0, 0x000000ff,false),
81 HOWTO(R_68K_PLT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0, 0xffffffff,true),
82 HOWTO(R_68K_PLT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0, 0x0000ffff,true),
83 HOWTO(R_68K_PLT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0, 0x000000ff,true),
84 HOWTO(R_68K_PLT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0, 0xffffffff,false),
85 HOWTO(R_68K_PLT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0, 0x0000ffff,false),
86 HOWTO(R_68K_PLT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", false, 0, 0x000000ff,false),
87 HOWTO(R_68K_COPY, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", false, 0, 0xffffffff,false),
88 HOWTO(R_68K_GLOB_DAT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", false, 0, 0xffffffff,false),
89 HOWTO(R_68K_JMP_SLOT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", false, 0, 0xffffffff,false),
90 HOWTO(R_68K_RELATIVE, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", false, 0, 0xffffffff,false),
91 /* GNU extension to record C++ vtable hierarchy */
92 HOWTO (R_68K_GNU_VTINHERIT, /* type */
93 0, /* rightshift */
94 2, /* size (0 = byte, 1 = short, 2 = long) */
95 0, /* bitsize */
96 false, /* pc_relative */
97 0, /* bitpos */
98 complain_overflow_dont, /* complain_on_overflow */
99 NULL, /* special_function */
100 "R_68K_GNU_VTINHERIT", /* name */
101 false, /* partial_inplace */
102 0, /* src_mask */
103 0, /* dst_mask */
104 false),
105 /* GNU extension to record C++ vtable member usage */
106 HOWTO (R_68K_GNU_VTENTRY, /* type */
107 0, /* rightshift */
108 2, /* size (0 = byte, 1 = short, 2 = long) */
109 0, /* bitsize */
110 false, /* pc_relative */
111 0, /* bitpos */
112 complain_overflow_dont, /* complain_on_overflow */
113 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
114 "R_68K_GNU_VTENTRY", /* name */
115 false, /* partial_inplace */
116 0, /* src_mask */
117 0, /* dst_mask */
118 false),
119 };
120
121 static void
122 rtype_to_howto (abfd, cache_ptr, dst)
123 bfd *abfd ATTRIBUTE_UNUSED;
124 arelent *cache_ptr;
125 Elf_Internal_Rela *dst;
126 {
127 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max);
128 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
129 }
130
131 #define elf_info_to_howto rtype_to_howto
132
133 static const struct
134 {
135 bfd_reloc_code_real_type bfd_val;
136 int elf_val;
137 } reloc_map[] = {
138 { BFD_RELOC_NONE, R_68K_NONE },
139 { BFD_RELOC_32, R_68K_32 },
140 { BFD_RELOC_16, R_68K_16 },
141 { BFD_RELOC_8, R_68K_8 },
142 { BFD_RELOC_32_PCREL, R_68K_PC32 },
143 { BFD_RELOC_16_PCREL, R_68K_PC16 },
144 { BFD_RELOC_8_PCREL, R_68K_PC8 },
145 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 },
146 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 },
147 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 },
148 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O },
149 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O },
150 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O },
151 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 },
152 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 },
153 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 },
154 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O },
155 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O },
156 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O },
157 { BFD_RELOC_NONE, R_68K_COPY },
158 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT },
159 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT },
160 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE },
161 { BFD_RELOC_CTOR, R_68K_32 },
162 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT },
163 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY },
164 };
165
166 static reloc_howto_type *
167 reloc_type_lookup (abfd, code)
168 bfd *abfd ATTRIBUTE_UNUSED;
169 bfd_reloc_code_real_type code;
170 {
171 unsigned int i;
172 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
173 {
174 if (reloc_map[i].bfd_val == code)
175 return &howto_table[reloc_map[i].elf_val];
176 }
177 return 0;
178 }
179
180 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
181 #define ELF_ARCH bfd_arch_m68k
182 /* end code generated by elf.el */
183 \f
184 /* Functions for the m68k ELF linker. */
185
186 /* The name of the dynamic interpreter. This is put in the .interp
187 section. */
188
189 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
190
191 /* The size in bytes of an entry in the procedure linkage table. */
192
193 #define PLT_ENTRY_SIZE 20
194
195 /* The first entry in a procedure linkage table looks like this. See
196 the SVR4 ABI m68k supplement to see how this works. */
197
198 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
199 {
200 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
201 0, 0, 0, 0, /* replaced with offset to .got + 4. */
202 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
203 0, 0, 0, 0, /* replaced with offset to .got + 8. */
204 0, 0, 0, 0 /* pad out to 20 bytes. */
205 };
206
207 /* Subsequent entries in a procedure linkage table look like this. */
208
209 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
210 {
211 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
212 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
213 0x2f, 0x3c, /* move.l #offset,-(%sp) */
214 0, 0, 0, 0, /* replaced with offset into relocation table. */
215 0x60, 0xff, /* bra.l .plt */
216 0, 0, 0, 0 /* replaced with offset to start of .plt. */
217 };
218
219 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
220
221 #define PLT_CPU32_ENTRY_SIZE 24
222 /* Procedure linkage table entries for the cpu32 */
223 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
224 {
225 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
226 0, 0, 0, 0, /* replaced with offset to .got + 4. */
227 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
228 0, 0, 0, 0, /* replace with offset to .got +8. */
229 0x4e, 0xd1, /* jmp %a1@ */
230 0, 0, 0, 0, /* pad out to 24 bytes. */
231 0, 0
232 };
233
234 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
235 {
236 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
237 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
238 0x4e, 0xd1, /* jmp %a1@ */
239 0x2f, 0x3c, /* move.l #offset,-(%sp) */
240 0, 0, 0, 0, /* replaced with offset into relocation table. */
241 0x60, 0xff, /* bra.l .plt */
242 0, 0, 0, 0, /* replaced with offset to start of .plt. */
243 0, 0
244 };
245
246 /* The m68k linker needs to keep track of the number of relocs that it
247 decides to copy in check_relocs for each symbol. This is so that it
248 can discard PC relative relocs if it doesn't need them when linking
249 with -Bsymbolic. We store the information in a field extending the
250 regular ELF linker hash table. */
251
252 /* This structure keeps track of the number of PC relative relocs we have
253 copied for a given symbol. */
254
255 struct elf_m68k_pcrel_relocs_copied
256 {
257 /* Next section. */
258 struct elf_m68k_pcrel_relocs_copied *next;
259 /* A section in dynobj. */
260 asection *section;
261 /* Number of relocs copied in this section. */
262 bfd_size_type count;
263 };
264
265 /* m68k ELF linker hash entry. */
266
267 struct elf_m68k_link_hash_entry
268 {
269 struct elf_link_hash_entry root;
270
271 /* Number of PC relative relocs copied for this symbol. */
272 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
273 };
274
275 /* m68k ELF linker hash table. */
276
277 struct elf_m68k_link_hash_table
278 {
279 struct elf_link_hash_table root;
280 };
281
282 /* Declare this now that the above structures are defined. */
283
284 static boolean elf_m68k_discard_copies
285 PARAMS ((struct elf_m68k_link_hash_entry *, PTR));
286
287 /* Traverse an m68k ELF linker hash table. */
288
289 #define elf_m68k_link_hash_traverse(table, func, info) \
290 (elf_link_hash_traverse \
291 (&(table)->root, \
292 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
293 (info)))
294
295 /* Get the m68k ELF linker hash table from a link_info structure. */
296
297 #define elf_m68k_hash_table(p) \
298 ((struct elf_m68k_link_hash_table *) (p)->hash)
299
300 /* Create an entry in an m68k ELF linker hash table. */
301
302 static struct bfd_hash_entry *
303 elf_m68k_link_hash_newfunc (entry, table, string)
304 struct bfd_hash_entry *entry;
305 struct bfd_hash_table *table;
306 const char *string;
307 {
308 struct elf_m68k_link_hash_entry *ret =
309 (struct elf_m68k_link_hash_entry *) entry;
310
311 /* Allocate the structure if it has not already been allocated by a
312 subclass. */
313 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
314 ret = ((struct elf_m68k_link_hash_entry *)
315 bfd_hash_allocate (table,
316 sizeof (struct elf_m68k_link_hash_entry)));
317 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
318 return (struct bfd_hash_entry *) ret;
319
320 /* Call the allocation method of the superclass. */
321 ret = ((struct elf_m68k_link_hash_entry *)
322 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
323 table, string));
324 if (ret != (struct elf_m68k_link_hash_entry *) NULL)
325 {
326 ret->pcrel_relocs_copied = NULL;
327 }
328
329 return (struct bfd_hash_entry *) ret;
330 }
331
332 /* Create an m68k ELF linker hash table. */
333
334 static struct bfd_link_hash_table *
335 elf_m68k_link_hash_table_create (abfd)
336 bfd *abfd;
337 {
338 struct elf_m68k_link_hash_table *ret;
339 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table);
340
341 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt);
342 if (ret == (struct elf_m68k_link_hash_table *) NULL)
343 return NULL;
344
345 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
346 elf_m68k_link_hash_newfunc))
347 {
348 free (ret);
349 return NULL;
350 }
351
352 return &ret->root.root;
353 }
354
355 /* Keep m68k-specific flags in the ELF header */
356 static boolean
357 elf32_m68k_set_private_flags (abfd, flags)
358 bfd *abfd;
359 flagword flags;
360 {
361 elf_elfheader (abfd)->e_flags = flags;
362 elf_flags_init (abfd) = true;
363 return true;
364 }
365
366 /* Merge backend specific data from an object file to the output
367 object file when linking. */
368 static boolean
369 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
370 bfd *ibfd;
371 bfd *obfd;
372 {
373 flagword out_flags;
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 out_flags = elf_elfheader (obfd)->e_flags;
382
383 if (!elf_flags_init (obfd))
384 {
385 elf_flags_init (obfd) = true;
386 elf_elfheader (obfd)->e_flags = in_flags;
387 }
388
389 return true;
390 }
391
392 /* Display the flags field */
393 static boolean
394 elf32_m68k_print_private_bfd_data (abfd, ptr)
395 bfd *abfd;
396 PTR ptr;
397 {
398 FILE *file = (FILE *) ptr;
399
400 BFD_ASSERT (abfd != NULL && ptr != NULL);
401
402 /* Print normal ELF private data. */
403 _bfd_elf_print_private_bfd_data (abfd, ptr);
404
405 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
406
407 /* xgettext:c-format */
408 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
409
410 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
411 fprintf (file, _(" [cpu32]"));
412
413 if (elf_elfheader (abfd)->e_flags & EF_M68000)
414 fprintf (file, _(" [m68000]"));
415
416 fputc ('\n', file);
417
418 return true;
419 }
420 /* Look through the relocs for a section during the first phase, and
421 allocate space in the global offset table or procedure linkage
422 table. */
423
424 static boolean
425 elf_m68k_check_relocs (abfd, info, sec, relocs)
426 bfd *abfd;
427 struct bfd_link_info *info;
428 asection *sec;
429 const Elf_Internal_Rela *relocs;
430 {
431 bfd *dynobj;
432 Elf_Internal_Shdr *symtab_hdr;
433 struct elf_link_hash_entry **sym_hashes;
434 bfd_signed_vma *local_got_refcounts;
435 const Elf_Internal_Rela *rel;
436 const Elf_Internal_Rela *rel_end;
437 asection *sgot;
438 asection *srelgot;
439 asection *sreloc;
440
441 if (info->relocateable)
442 return true;
443
444 dynobj = elf_hash_table (info)->dynobj;
445 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
446 sym_hashes = elf_sym_hashes (abfd);
447 local_got_refcounts = elf_local_got_refcounts (abfd);
448
449 sgot = NULL;
450 srelgot = NULL;
451 sreloc = NULL;
452
453 rel_end = relocs + sec->reloc_count;
454 for (rel = relocs; rel < rel_end; rel++)
455 {
456 unsigned long r_symndx;
457 struct elf_link_hash_entry *h;
458
459 r_symndx = ELF32_R_SYM (rel->r_info);
460
461 if (r_symndx < symtab_hdr->sh_info)
462 h = NULL;
463 else
464 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
465
466 switch (ELF32_R_TYPE (rel->r_info))
467 {
468 case R_68K_GOT8:
469 case R_68K_GOT16:
470 case R_68K_GOT32:
471 if (h != NULL
472 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
473 break;
474 /* Fall through. */
475 case R_68K_GOT8O:
476 case R_68K_GOT16O:
477 case R_68K_GOT32O:
478 /* This symbol requires a global offset table entry. */
479
480 if (dynobj == NULL)
481 {
482 /* Create the .got section. */
483 elf_hash_table (info)->dynobj = dynobj = abfd;
484 if (!_bfd_elf_create_got_section (dynobj, info))
485 return false;
486 }
487
488 if (sgot == NULL)
489 {
490 sgot = bfd_get_section_by_name (dynobj, ".got");
491 BFD_ASSERT (sgot != NULL);
492 }
493
494 if (srelgot == NULL
495 && (h != NULL || info->shared))
496 {
497 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
498 if (srelgot == NULL)
499 {
500 srelgot = bfd_make_section (dynobj, ".rela.got");
501 if (srelgot == NULL
502 || !bfd_set_section_flags (dynobj, srelgot,
503 (SEC_ALLOC
504 | SEC_LOAD
505 | SEC_HAS_CONTENTS
506 | SEC_IN_MEMORY
507 | SEC_LINKER_CREATED
508 | SEC_READONLY))
509 || !bfd_set_section_alignment (dynobj, srelgot, 2))
510 return false;
511 }
512 }
513
514 if (h != NULL)
515 {
516 if (h->got.refcount == 0)
517 {
518 /* Make sure this symbol is output as a dynamic symbol. */
519 if (h->dynindx == -1)
520 {
521 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
522 return false;
523 }
524
525 /* Allocate space in the .got section. */
526 sgot->_raw_size += 4;
527 /* Allocate relocation space. */
528 srelgot->_raw_size += sizeof (Elf32_External_Rela);
529 }
530 h->got.refcount++;
531 }
532 else
533 {
534 /* This is a global offset table entry for a local symbol. */
535 if (local_got_refcounts == NULL)
536 {
537 bfd_size_type size;
538
539 size = symtab_hdr->sh_info;
540 size *= sizeof (bfd_signed_vma);
541 local_got_refcounts = ((bfd_signed_vma *)
542 bfd_zalloc (abfd, size));
543 if (local_got_refcounts == NULL)
544 return false;
545 elf_local_got_refcounts (abfd) = local_got_refcounts;
546 }
547 if (local_got_refcounts[r_symndx] == 0)
548 {
549 sgot->_raw_size += 4;
550 if (info->shared)
551 {
552 /* If we are generating a shared object, we need to
553 output a R_68K_RELATIVE reloc so that the dynamic
554 linker can adjust this GOT entry. */
555 srelgot->_raw_size += sizeof (Elf32_External_Rela);
556 }
557 }
558 local_got_refcounts[r_symndx]++;
559 }
560 break;
561
562 case R_68K_PLT8:
563 case R_68K_PLT16:
564 case R_68K_PLT32:
565 /* This symbol requires a procedure linkage table entry. We
566 actually build the entry in adjust_dynamic_symbol,
567 because this might be a case of linking PIC code which is
568 never referenced by a dynamic object, in which case we
569 don't need to generate a procedure linkage table entry
570 after all. */
571
572 /* If this is a local symbol, we resolve it directly without
573 creating a procedure linkage table entry. */
574 if (h == NULL)
575 continue;
576
577 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
578 h->plt.refcount++;
579 break;
580
581 case R_68K_PLT8O:
582 case R_68K_PLT16O:
583 case R_68K_PLT32O:
584 /* This symbol requires a procedure linkage table entry. */
585
586 if (h == NULL)
587 {
588 /* It does not make sense to have this relocation for a
589 local symbol. FIXME: does it? How to handle it if
590 it does make sense? */
591 bfd_set_error (bfd_error_bad_value);
592 return false;
593 }
594
595 /* Make sure this symbol is output as a dynamic symbol. */
596 if (h->dynindx == -1)
597 {
598 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
599 return false;
600 }
601
602 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
603 h->plt.refcount++;
604 break;
605
606 case R_68K_PC8:
607 case R_68K_PC16:
608 case R_68K_PC32:
609 /* If we are creating a shared library and this is not a local
610 symbol, we need to copy the reloc into the shared library.
611 However when linking with -Bsymbolic and this is a global
612 symbol which is defined in an object we are including in the
613 link (i.e., DEF_REGULAR is set), then we can resolve the
614 reloc directly. At this point we have not seen all the input
615 files, so it is possible that DEF_REGULAR is not set now but
616 will be set later (it is never cleared). We account for that
617 possibility below by storing information in the
618 pcrel_relocs_copied field of the hash table entry. */
619 if (!(info->shared
620 && (sec->flags & SEC_ALLOC) != 0
621 && h != NULL
622 && (!info->symbolic
623 || (h->elf_link_hash_flags
624 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
625 {
626 if (h != NULL)
627 {
628 /* Make sure a plt entry is created for this symbol if
629 it turns out to be a function defined by a dynamic
630 object. */
631 h->plt.refcount++;
632 }
633 break;
634 }
635 /* Fall through. */
636 case R_68K_8:
637 case R_68K_16:
638 case R_68K_32:
639 if (h != NULL)
640 {
641 /* Make sure a plt entry is created for this symbol if it
642 turns out to be a function defined by a dynamic object. */
643 h->plt.refcount++;
644 }
645
646 /* If we are creating a shared library, we need to copy the
647 reloc into the shared library. */
648 if (info->shared
649 && (sec->flags & SEC_ALLOC) != 0)
650 {
651 /* When creating a shared object, we must copy these
652 reloc types into the output file. We create a reloc
653 section in dynobj and make room for this reloc. */
654 if (sreloc == NULL)
655 {
656 const char *name;
657
658 name = (bfd_elf_string_from_elf_section
659 (abfd,
660 elf_elfheader (abfd)->e_shstrndx,
661 elf_section_data (sec)->rel_hdr.sh_name));
662 if (name == NULL)
663 return false;
664
665 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
666 && strcmp (bfd_get_section_name (abfd, sec),
667 name + 5) == 0);
668
669 sreloc = bfd_get_section_by_name (dynobj, name);
670 if (sreloc == NULL)
671 {
672 sreloc = bfd_make_section (dynobj, name);
673 if (sreloc == NULL
674 || !bfd_set_section_flags (dynobj, sreloc,
675 (SEC_ALLOC
676 | SEC_LOAD
677 | SEC_HAS_CONTENTS
678 | SEC_IN_MEMORY
679 | SEC_LINKER_CREATED
680 | SEC_READONLY))
681 || !bfd_set_section_alignment (dynobj, sreloc, 2))
682 return false;
683 }
684 if (sec->flags & SEC_READONLY)
685 info->flags |= DF_TEXTREL;
686 }
687
688 sreloc->_raw_size += sizeof (Elf32_External_Rela);
689
690 /* If we are linking with -Bsymbolic, we count the number of
691 PC relative relocations we have entered for this symbol,
692 so that we can discard them again if the symbol is later
693 defined by a regular object. Note that this function is
694 only called if we are using an m68kelf linker hash table,
695 which means that h is really a pointer to an
696 elf_m68k_link_hash_entry. */
697 if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8
698 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
699 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
700 && info->symbolic)
701 {
702 struct elf_m68k_link_hash_entry *eh;
703 struct elf_m68k_pcrel_relocs_copied *p;
704
705 eh = (struct elf_m68k_link_hash_entry *) h;
706
707 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
708 if (p->section == sreloc)
709 break;
710
711 if (p == NULL)
712 {
713 p = ((struct elf_m68k_pcrel_relocs_copied *)
714 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
715 if (p == NULL)
716 return false;
717 p->next = eh->pcrel_relocs_copied;
718 eh->pcrel_relocs_copied = p;
719 p->section = sreloc;
720 p->count = 0;
721 }
722
723 ++p->count;
724 }
725 }
726
727 break;
728
729 /* This relocation describes the C++ object vtable hierarchy.
730 Reconstruct it for later use during GC. */
731 case R_68K_GNU_VTINHERIT:
732 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
733 return false;
734 break;
735
736 /* This relocation describes which C++ vtable entries are actually
737 used. Record for later use during GC. */
738 case R_68K_GNU_VTENTRY:
739 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
740 return false;
741 break;
742
743 default:
744 break;
745 }
746 }
747
748 return true;
749 }
750
751 /* Return the section that should be marked against GC for a given
752 relocation. */
753
754 static asection *
755 elf_m68k_gc_mark_hook (sec, info, rel, h, sym)
756 asection *sec;
757 struct bfd_link_info *info ATTRIBUTE_UNUSED;
758 Elf_Internal_Rela *rel;
759 struct elf_link_hash_entry *h;
760 Elf_Internal_Sym *sym;
761 {
762 if (h != NULL)
763 {
764 switch (ELF32_R_TYPE (rel->r_info))
765 {
766 case R_68K_GNU_VTINHERIT:
767 case R_68K_GNU_VTENTRY:
768 break;
769
770 default:
771 switch (h->root.type)
772 {
773 default:
774 break;
775
776 case bfd_link_hash_defined:
777 case bfd_link_hash_defweak:
778 return h->root.u.def.section;
779
780 case bfd_link_hash_common:
781 return h->root.u.c.p->section;
782 }
783 }
784 }
785 else
786 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
787
788 return NULL;
789 }
790
791 /* Update the got entry reference counts for the section being removed. */
792
793 static boolean
794 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
795 bfd *abfd;
796 struct bfd_link_info *info;
797 asection *sec;
798 const Elf_Internal_Rela *relocs;
799 {
800 Elf_Internal_Shdr *symtab_hdr;
801 struct elf_link_hash_entry **sym_hashes;
802 bfd_signed_vma *local_got_refcounts;
803 const Elf_Internal_Rela *rel, *relend;
804 unsigned long r_symndx;
805 struct elf_link_hash_entry *h;
806 bfd *dynobj;
807 asection *sgot;
808 asection *srelgot;
809
810 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
811 sym_hashes = elf_sym_hashes (abfd);
812 local_got_refcounts = elf_local_got_refcounts (abfd);
813
814 dynobj = elf_hash_table (info)->dynobj;
815 if (dynobj == NULL)
816 return true;
817
818 sgot = bfd_get_section_by_name (dynobj, ".got");
819 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
820
821 relend = relocs + sec->reloc_count;
822 for (rel = relocs; rel < relend; rel++)
823 {
824 switch (ELF32_R_TYPE (rel->r_info))
825 {
826 case R_68K_GOT8:
827 case R_68K_GOT16:
828 case R_68K_GOT32:
829 case R_68K_GOT8O:
830 case R_68K_GOT16O:
831 case R_68K_GOT32O:
832 r_symndx = ELF32_R_SYM (rel->r_info);
833 if (r_symndx >= symtab_hdr->sh_info)
834 {
835 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
836 if (h->got.refcount > 0)
837 {
838 --h->got.refcount;
839 if (h->got.refcount == 0)
840 {
841 /* We don't need the .got entry any more. */
842 sgot->_raw_size -= 4;
843 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
844 }
845 }
846 }
847 else if (local_got_refcounts != NULL)
848 {
849 if (local_got_refcounts[r_symndx] > 0)
850 {
851 --local_got_refcounts[r_symndx];
852 if (local_got_refcounts[r_symndx] == 0)
853 {
854 /* We don't need the .got entry any more. */
855 sgot->_raw_size -= 4;
856 if (info->shared)
857 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
858 }
859 }
860 }
861 break;
862
863 case R_68K_PLT8:
864 case R_68K_PLT16:
865 case R_68K_PLT32:
866 case R_68K_PLT8O:
867 case R_68K_PLT16O:
868 case R_68K_PLT32O:
869 case R_68K_PC8:
870 case R_68K_PC16:
871 case R_68K_PC32:
872 case R_68K_8:
873 case R_68K_16:
874 case R_68K_32:
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->plt.refcount > 0)
880 --h->plt.refcount;
881 }
882 break;
883
884 default:
885 break;
886 }
887 }
888
889 return true;
890 }
891
892 /* Adjust a symbol defined by a dynamic object and referenced by a
893 regular object. The current definition is in some section of the
894 dynamic object, but we're not including those sections. We have to
895 change the definition to something the rest of the link can
896 understand. */
897
898 static boolean
899 elf_m68k_adjust_dynamic_symbol (info, h)
900 struct bfd_link_info *info;
901 struct elf_link_hash_entry *h;
902 {
903 bfd *dynobj;
904 asection *s;
905 unsigned int power_of_two;
906
907 dynobj = elf_hash_table (info)->dynobj;
908
909 /* Make sure we know what is going on here. */
910 BFD_ASSERT (dynobj != NULL
911 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
912 || h->weakdef != NULL
913 || ((h->elf_link_hash_flags
914 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
915 && (h->elf_link_hash_flags
916 & ELF_LINK_HASH_REF_REGULAR) != 0
917 && (h->elf_link_hash_flags
918 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
919
920 /* If this is a function, put it in the procedure linkage table. We
921 will fill in the contents of the procedure linkage table later,
922 when we know the address of the .got section. */
923 if (h->type == STT_FUNC
924 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
925 {
926 if (! info->shared
927 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
928 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
929 /* We must always create the plt entry if it was referenced
930 by a PLTxxO relocation. In this case we already recorded
931 it as a dynamic symbol. */
932 && h->dynindx == -1)
933 {
934 /* This case can occur if we saw a PLTxx reloc in an input
935 file, but the symbol was never referred to by a dynamic
936 object. In such a case, we don't actually need to build
937 a procedure linkage table, and we can just do a PCxx
938 reloc instead. */
939 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
940 h->plt.offset = (bfd_vma) -1;
941 return true;
942 }
943
944 /* GC may have rendered this entry unused. */
945 if (h->plt.refcount <= 0)
946 {
947 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
948 h->plt.offset = (bfd_vma) -1;
949 return true;
950 }
951
952 /* Make sure this symbol is output as a dynamic symbol. */
953 if (h->dynindx == -1)
954 {
955 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
956 return false;
957 }
958
959 s = bfd_get_section_by_name (dynobj, ".plt");
960 BFD_ASSERT (s != NULL);
961
962 /* If this is the first .plt entry, make room for the special
963 first entry. */
964 if (s->_raw_size == 0)
965 {
966 if (CPU32_FLAG (dynobj))
967 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
968 else
969 s->_raw_size += PLT_ENTRY_SIZE;
970 }
971
972 /* If this symbol is not defined in a regular file, and we are
973 not generating a shared library, then set the symbol to this
974 location in the .plt. This is required to make function
975 pointers compare as equal between the normal executable and
976 the shared library. */
977 if (!info->shared
978 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
979 {
980 h->root.u.def.section = s;
981 h->root.u.def.value = s->_raw_size;
982 }
983
984 h->plt.offset = s->_raw_size;
985
986 /* Make room for this entry. */
987 if (CPU32_FLAG (dynobj))
988 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
989 else
990 s->_raw_size += PLT_ENTRY_SIZE;
991
992 /* We also need to make an entry in the .got.plt section, which
993 will be placed in the .got section by the linker script. */
994
995 s = bfd_get_section_by_name (dynobj, ".got.plt");
996 BFD_ASSERT (s != NULL);
997 s->_raw_size += 4;
998
999 /* We also need to make an entry in the .rela.plt section. */
1000
1001 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1002 BFD_ASSERT (s != NULL);
1003 s->_raw_size += sizeof (Elf32_External_Rela);
1004
1005 return true;
1006 }
1007
1008 /* Reinitialize the plt offset now that it is not used as a reference
1009 count any more. */
1010 h->plt.offset = (bfd_vma) -1;
1011
1012 /* If this is a weak symbol, and there is a real definition, the
1013 processor independent code will have arranged for us to see the
1014 real definition first, and we can just use the same value. */
1015 if (h->weakdef != NULL)
1016 {
1017 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1018 || h->weakdef->root.type == bfd_link_hash_defweak);
1019 h->root.u.def.section = h->weakdef->root.u.def.section;
1020 h->root.u.def.value = h->weakdef->root.u.def.value;
1021 return true;
1022 }
1023
1024 /* This is a reference to a symbol defined by a dynamic object which
1025 is not a function. */
1026
1027 /* If we are creating a shared library, we must presume that the
1028 only references to the symbol are via the global offset table.
1029 For such cases we need not do anything here; the relocations will
1030 be handled correctly by relocate_section. */
1031 if (info->shared)
1032 return true;
1033
1034 /* We must allocate the symbol in our .dynbss section, which will
1035 become part of the .bss section of the executable. There will be
1036 an entry for this symbol in the .dynsym section. The dynamic
1037 object will contain position independent code, so all references
1038 from the dynamic object to this symbol will go through the global
1039 offset table. The dynamic linker will use the .dynsym entry to
1040 determine the address it must put in the global offset table, so
1041 both the dynamic object and the regular object will refer to the
1042 same memory location for the variable. */
1043
1044 s = bfd_get_section_by_name (dynobj, ".dynbss");
1045 BFD_ASSERT (s != NULL);
1046
1047 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1048 copy the initial value out of the dynamic object and into the
1049 runtime process image. We need to remember the offset into the
1050 .rela.bss section we are going to use. */
1051 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1052 {
1053 asection *srel;
1054
1055 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1056 BFD_ASSERT (srel != NULL);
1057 srel->_raw_size += sizeof (Elf32_External_Rela);
1058 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1059 }
1060
1061 /* We need to figure out the alignment required for this symbol. I
1062 have no idea how ELF linkers handle this. */
1063 power_of_two = bfd_log2 (h->size);
1064 if (power_of_two > 3)
1065 power_of_two = 3;
1066
1067 /* Apply the required alignment. */
1068 s->_raw_size = BFD_ALIGN (s->_raw_size,
1069 (bfd_size_type) (1 << power_of_two));
1070 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1071 {
1072 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1073 return false;
1074 }
1075
1076 /* Define the symbol as being at this point in the section. */
1077 h->root.u.def.section = s;
1078 h->root.u.def.value = s->_raw_size;
1079
1080 /* Increment the section size to make room for the symbol. */
1081 s->_raw_size += h->size;
1082
1083 return true;
1084 }
1085
1086 /* Set the sizes of the dynamic sections. */
1087
1088 static boolean
1089 elf_m68k_size_dynamic_sections (output_bfd, info)
1090 bfd *output_bfd ATTRIBUTE_UNUSED;
1091 struct bfd_link_info *info;
1092 {
1093 bfd *dynobj;
1094 asection *s;
1095 boolean plt;
1096 boolean relocs;
1097
1098 dynobj = elf_hash_table (info)->dynobj;
1099 BFD_ASSERT (dynobj != NULL);
1100
1101 if (elf_hash_table (info)->dynamic_sections_created)
1102 {
1103 /* Set the contents of the .interp section to the interpreter. */
1104 if (!info->shared)
1105 {
1106 s = bfd_get_section_by_name (dynobj, ".interp");
1107 BFD_ASSERT (s != NULL);
1108 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1109 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1110 }
1111 }
1112 else
1113 {
1114 /* We may have created entries in the .rela.got section.
1115 However, if we are not creating the dynamic sections, we will
1116 not actually use these entries. Reset the size of .rela.got,
1117 which will cause it to get stripped from the output file
1118 below. */
1119 s = bfd_get_section_by_name (dynobj, ".rela.got");
1120 if (s != NULL)
1121 s->_raw_size = 0;
1122 }
1123
1124 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1125 relative relocs against symbols defined in a regular object. We
1126 allocated space for them in the check_relocs routine, but we will not
1127 fill them in in the relocate_section routine. */
1128 if (info->shared && info->symbolic)
1129 elf_m68k_link_hash_traverse (elf_m68k_hash_table (info),
1130 elf_m68k_discard_copies,
1131 (PTR) NULL);
1132
1133 /* The check_relocs and adjust_dynamic_symbol entry points have
1134 determined the sizes of the various dynamic sections. Allocate
1135 memory for them. */
1136 plt = false;
1137 relocs = false;
1138 for (s = dynobj->sections; s != NULL; s = s->next)
1139 {
1140 const char *name;
1141 boolean strip;
1142
1143 if ((s->flags & SEC_LINKER_CREATED) == 0)
1144 continue;
1145
1146 /* It's OK to base decisions on the section name, because none
1147 of the dynobj section names depend upon the input files. */
1148 name = bfd_get_section_name (dynobj, s);
1149
1150 strip = false;
1151
1152 if (strcmp (name, ".plt") == 0)
1153 {
1154 if (s->_raw_size == 0)
1155 {
1156 /* Strip this section if we don't need it; see the
1157 comment below. */
1158 strip = true;
1159 }
1160 else
1161 {
1162 /* Remember whether there is a PLT. */
1163 plt = true;
1164 }
1165 }
1166 else if (strncmp (name, ".rela", 5) == 0)
1167 {
1168 if (s->_raw_size == 0)
1169 {
1170 /* If we don't need this section, strip it from the
1171 output file. This is mostly to handle .rela.bss and
1172 .rela.plt. We must create both sections in
1173 create_dynamic_sections, because they must be created
1174 before the linker maps input sections to output
1175 sections. The linker does that before
1176 adjust_dynamic_symbol is called, and it is that
1177 function which decides whether anything needs to go
1178 into these sections. */
1179 strip = true;
1180 }
1181 else
1182 {
1183 relocs = true;
1184
1185 /* We use the reloc_count field as a counter if we need
1186 to copy relocs into the output file. */
1187 s->reloc_count = 0;
1188 }
1189 }
1190 else if (strncmp (name, ".got", 4) != 0)
1191 {
1192 /* It's not one of our sections, so don't allocate space. */
1193 continue;
1194 }
1195
1196 if (strip)
1197 {
1198 _bfd_strip_section_from_output (info, s);
1199 continue;
1200 }
1201
1202 /* Allocate memory for the section contents. */
1203 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1204 Unused entries should be reclaimed before the section's contents
1205 are written out, but at the moment this does not happen. Thus in
1206 order to prevent writing out garbage, we initialise the section's
1207 contents to zero. */
1208 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1209 if (s->contents == NULL && s->_raw_size != 0)
1210 return false;
1211 }
1212
1213 if (elf_hash_table (info)->dynamic_sections_created)
1214 {
1215 /* Add some entries to the .dynamic section. We fill in the
1216 values later, in elf_m68k_finish_dynamic_sections, but we
1217 must add the entries now so that we get the correct size for
1218 the .dynamic section. The DT_DEBUG entry is filled in by the
1219 dynamic linker and used by the debugger. */
1220 #define add_dynamic_entry(TAG, VAL) \
1221 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1222
1223 if (!info->shared)
1224 {
1225 if (!add_dynamic_entry (DT_DEBUG, 0))
1226 return false;
1227 }
1228
1229 if (plt)
1230 {
1231 if (!add_dynamic_entry (DT_PLTGOT, 0)
1232 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1233 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1234 || !add_dynamic_entry (DT_JMPREL, 0))
1235 return false;
1236 }
1237
1238 if (relocs)
1239 {
1240 if (!add_dynamic_entry (DT_RELA, 0)
1241 || !add_dynamic_entry (DT_RELASZ, 0)
1242 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1243 return false;
1244 }
1245
1246 if ((info->flags & DF_TEXTREL) != 0)
1247 {
1248 if (!add_dynamic_entry (DT_TEXTREL, 0))
1249 return false;
1250 }
1251 }
1252 #undef add_dynamic_entry
1253
1254 return true;
1255 }
1256
1257 /* This function is called via elf_m68k_link_hash_traverse if we are
1258 creating a shared object with -Bsymbolic. It discards the space
1259 allocated to copy PC relative relocs against symbols which are defined
1260 in regular objects. We allocated space for them in the check_relocs
1261 routine, but we won't fill them in in the relocate_section routine. */
1262
1263 static boolean
1264 elf_m68k_discard_copies (h, ignore)
1265 struct elf_m68k_link_hash_entry *h;
1266 PTR ignore ATTRIBUTE_UNUSED;
1267 {
1268 struct elf_m68k_pcrel_relocs_copied *s;
1269
1270 if (h->root.root.type == bfd_link_hash_warning)
1271 h = (struct elf_m68k_link_hash_entry *) h->root.root.u.i.link;
1272
1273 /* We only discard relocs for symbols defined in a regular object. */
1274 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1275 return true;
1276
1277 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1278 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1279
1280 return true;
1281 }
1282
1283 /* Relocate an M68K ELF section. */
1284
1285 static boolean
1286 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1287 contents, relocs, local_syms, local_sections)
1288 bfd *output_bfd;
1289 struct bfd_link_info *info;
1290 bfd *input_bfd;
1291 asection *input_section;
1292 bfd_byte *contents;
1293 Elf_Internal_Rela *relocs;
1294 Elf_Internal_Sym *local_syms;
1295 asection **local_sections;
1296 {
1297 bfd *dynobj;
1298 Elf_Internal_Shdr *symtab_hdr;
1299 struct elf_link_hash_entry **sym_hashes;
1300 bfd_vma *local_got_offsets;
1301 asection *sgot;
1302 asection *splt;
1303 asection *sreloc;
1304 Elf_Internal_Rela *rel;
1305 Elf_Internal_Rela *relend;
1306
1307 if (info->relocateable)
1308 return true;
1309
1310 dynobj = elf_hash_table (info)->dynobj;
1311 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1312 sym_hashes = elf_sym_hashes (input_bfd);
1313 local_got_offsets = elf_local_got_offsets (input_bfd);
1314
1315 sgot = NULL;
1316 splt = NULL;
1317 sreloc = NULL;
1318
1319 rel = relocs;
1320 relend = relocs + input_section->reloc_count;
1321 for (; rel < relend; rel++)
1322 {
1323 int r_type;
1324 reloc_howto_type *howto;
1325 unsigned long r_symndx;
1326 struct elf_link_hash_entry *h;
1327 Elf_Internal_Sym *sym;
1328 asection *sec;
1329 bfd_vma relocation;
1330 bfd_reloc_status_type r;
1331
1332 r_type = ELF32_R_TYPE (rel->r_info);
1333 if (r_type < 0 || r_type >= (int) R_68K_max)
1334 {
1335 bfd_set_error (bfd_error_bad_value);
1336 return false;
1337 }
1338 howto = howto_table + r_type;
1339
1340 r_symndx = ELF32_R_SYM (rel->r_info);
1341
1342 h = NULL;
1343 sym = NULL;
1344 sec = NULL;
1345 if (r_symndx < symtab_hdr->sh_info)
1346 {
1347 sym = local_syms + r_symndx;
1348 sec = local_sections[r_symndx];
1349 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
1350 }
1351 else
1352 {
1353 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1354 while (h->root.type == bfd_link_hash_indirect
1355 || h->root.type == bfd_link_hash_warning)
1356 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1357 if (h->root.type == bfd_link_hash_defined
1358 || h->root.type == bfd_link_hash_defweak)
1359 {
1360 sec = h->root.u.def.section;
1361 if (((r_type == R_68K_PLT8
1362 || r_type == R_68K_PLT16
1363 || r_type == R_68K_PLT32
1364 || r_type == R_68K_PLT8O
1365 || r_type == R_68K_PLT16O
1366 || r_type == R_68K_PLT32O)
1367 && h->plt.offset != (bfd_vma) -1
1368 && elf_hash_table (info)->dynamic_sections_created)
1369 || ((r_type == R_68K_GOT8O
1370 || r_type == R_68K_GOT16O
1371 || r_type == R_68K_GOT32O
1372 || ((r_type == R_68K_GOT8
1373 || r_type == R_68K_GOT16
1374 || r_type == R_68K_GOT32)
1375 && strcmp (h->root.root.string,
1376 "_GLOBAL_OFFSET_TABLE_") != 0))
1377 && elf_hash_table (info)->dynamic_sections_created
1378 && (! info->shared
1379 || (! info->symbolic && h->dynindx != -1)
1380 || (h->elf_link_hash_flags
1381 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1382 || (info->shared
1383 && ((! info->symbolic && h->dynindx != -1)
1384 || (h->elf_link_hash_flags
1385 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1386 && ((input_section->flags & SEC_ALLOC) != 0
1387 /* DWARF will emit R_68K_32 relocations in its
1388 sections against symbols defined externally
1389 in shared libraries. We can't do anything
1390 with them here. */
1391 || ((input_section->flags & SEC_DEBUGGING) != 0
1392 && (h->elf_link_hash_flags
1393 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1394 && (r_type == R_68K_8
1395 || r_type == R_68K_16
1396 || r_type == R_68K_32
1397 || r_type == R_68K_PC8
1398 || r_type == R_68K_PC16
1399 || r_type == R_68K_PC32)))
1400 {
1401 /* In these cases, we don't need the relocation
1402 value. We check specially because in some
1403 obscure cases sec->output_section will be NULL. */
1404 relocation = 0;
1405 }
1406 else
1407 relocation = (h->root.u.def.value
1408 + sec->output_section->vma
1409 + sec->output_offset);
1410 }
1411 else if (h->root.type == bfd_link_hash_undefweak)
1412 relocation = 0;
1413 else if (info->shared
1414 && (!info->symbolic || info->allow_shlib_undefined)
1415 && !info->no_undefined
1416 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1417 relocation = 0;
1418 else
1419 {
1420 if (!(info->callbacks->undefined_symbol
1421 (info, h->root.root.string, input_bfd,
1422 input_section, rel->r_offset,
1423 (!info->shared || info->no_undefined
1424 || ELF_ST_VISIBILITY (h->other)))))
1425 return false;
1426 relocation = 0;
1427 }
1428 }
1429
1430 switch (r_type)
1431 {
1432 case R_68K_GOT8:
1433 case R_68K_GOT16:
1434 case R_68K_GOT32:
1435 /* Relocation is to the address of the entry for this symbol
1436 in the global offset table. */
1437 if (h != NULL
1438 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1439 break;
1440 /* Fall through. */
1441 case R_68K_GOT8O:
1442 case R_68K_GOT16O:
1443 case R_68K_GOT32O:
1444 /* Relocation is the offset of the entry for this symbol in
1445 the global offset table. */
1446
1447 {
1448 bfd_vma off;
1449
1450 if (sgot == NULL)
1451 {
1452 sgot = bfd_get_section_by_name (dynobj, ".got");
1453 BFD_ASSERT (sgot != NULL);
1454 }
1455
1456 if (h != NULL)
1457 {
1458 off = h->got.offset;
1459 BFD_ASSERT (off != (bfd_vma) -1);
1460
1461 if (!elf_hash_table (info)->dynamic_sections_created
1462 || (info->shared
1463 && (info->symbolic || h->dynindx == -1)
1464 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1465 {
1466 /* This is actually a static link, or it is a
1467 -Bsymbolic link and the symbol is defined
1468 locally, or the symbol was forced to be local
1469 because of a version file.. We must initialize
1470 this entry in the global offset table. Since
1471 the offset must always be a multiple of 4, we
1472 use the least significant bit to record whether
1473 we have initialized it already.
1474
1475 When doing a dynamic link, we create a .rela.got
1476 relocation entry to initialize the value. This
1477 is done in the finish_dynamic_symbol routine. */
1478 if ((off & 1) != 0)
1479 off &= ~1;
1480 else
1481 {
1482 bfd_put_32 (output_bfd, relocation,
1483 sgot->contents + off);
1484 h->got.offset |= 1;
1485 }
1486 }
1487 }
1488 else
1489 {
1490 BFD_ASSERT (local_got_offsets != NULL
1491 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1492
1493 off = local_got_offsets[r_symndx];
1494
1495 /* The offset must always be a multiple of 4. We use
1496 the least significant bit to record whether we have
1497 already generated the necessary reloc. */
1498 if ((off & 1) != 0)
1499 off &= ~1;
1500 else
1501 {
1502 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1503
1504 if (info->shared)
1505 {
1506 asection *srelgot;
1507 Elf_Internal_Rela outrel;
1508
1509 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1510 BFD_ASSERT (srelgot != NULL);
1511
1512 outrel.r_offset = (sgot->output_section->vma
1513 + sgot->output_offset
1514 + off);
1515 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1516 outrel.r_addend = relocation;
1517 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1518 (((Elf32_External_Rela *)
1519 srelgot->contents)
1520 + srelgot->reloc_count));
1521 ++srelgot->reloc_count;
1522 }
1523
1524 local_got_offsets[r_symndx] |= 1;
1525 }
1526 }
1527
1528 relocation = sgot->output_offset + off;
1529 if (r_type == R_68K_GOT8O
1530 || r_type == R_68K_GOT16O
1531 || r_type == R_68K_GOT32O)
1532 {
1533 /* This relocation does not use the addend. */
1534 rel->r_addend = 0;
1535 }
1536 else
1537 relocation += sgot->output_section->vma;
1538 }
1539 break;
1540
1541 case R_68K_PLT8:
1542 case R_68K_PLT16:
1543 case R_68K_PLT32:
1544 /* Relocation is to the entry for this symbol in the
1545 procedure linkage table. */
1546
1547 /* Resolve a PLTxx reloc against a local symbol directly,
1548 without using the procedure linkage table. */
1549 if (h == NULL)
1550 break;
1551
1552 if (h->plt.offset == (bfd_vma) -1
1553 || !elf_hash_table (info)->dynamic_sections_created)
1554 {
1555 /* We didn't make a PLT entry for this symbol. This
1556 happens when statically linking PIC code, or when
1557 using -Bsymbolic. */
1558 break;
1559 }
1560
1561 if (splt == NULL)
1562 {
1563 splt = bfd_get_section_by_name (dynobj, ".plt");
1564 BFD_ASSERT (splt != NULL);
1565 }
1566
1567 relocation = (splt->output_section->vma
1568 + splt->output_offset
1569 + h->plt.offset);
1570 break;
1571
1572 case R_68K_PLT8O:
1573 case R_68K_PLT16O:
1574 case R_68K_PLT32O:
1575 /* Relocation is the offset of the entry for this symbol in
1576 the procedure linkage table. */
1577 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1578
1579 if (splt == NULL)
1580 {
1581 splt = bfd_get_section_by_name (dynobj, ".plt");
1582 BFD_ASSERT (splt != NULL);
1583 }
1584
1585 relocation = h->plt.offset;
1586
1587 /* This relocation does not use the addend. */
1588 rel->r_addend = 0;
1589
1590 break;
1591
1592 case R_68K_PC8:
1593 case R_68K_PC16:
1594 case R_68K_PC32:
1595 if (h == NULL)
1596 break;
1597 /* Fall through. */
1598 case R_68K_8:
1599 case R_68K_16:
1600 case R_68K_32:
1601 if (info->shared
1602 && r_symndx != 0
1603 && (input_section->flags & SEC_ALLOC) != 0
1604 && ((r_type != R_68K_PC8
1605 && r_type != R_68K_PC16
1606 && r_type != R_68K_PC32)
1607 || (!info->symbolic
1608 || (h->elf_link_hash_flags
1609 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1610 {
1611 Elf_Internal_Rela outrel;
1612 boolean skip, relocate;
1613
1614 /* When generating a shared object, these relocations
1615 are copied into the output file to be resolved at run
1616 time. */
1617
1618 if (sreloc == NULL)
1619 {
1620 const char *name;
1621
1622 name = (bfd_elf_string_from_elf_section
1623 (input_bfd,
1624 elf_elfheader (input_bfd)->e_shstrndx,
1625 elf_section_data (input_section)->rel_hdr.sh_name));
1626 if (name == NULL)
1627 return false;
1628
1629 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1630 && strcmp (bfd_get_section_name (input_bfd,
1631 input_section),
1632 name + 5) == 0);
1633
1634 sreloc = bfd_get_section_by_name (dynobj, name);
1635 BFD_ASSERT (sreloc != NULL);
1636 }
1637
1638 skip = false;
1639 relocate = false;
1640
1641 outrel.r_offset =
1642 _bfd_elf_section_offset (output_bfd, info, input_section,
1643 rel->r_offset);
1644 if (outrel.r_offset == (bfd_vma) -1)
1645 skip = true;
1646 else if (outrel.r_offset == (bfd_vma) -2)
1647 skip = true, relocate = true;
1648 outrel.r_offset += (input_section->output_section->vma
1649 + input_section->output_offset);
1650
1651 if (skip)
1652 memset (&outrel, 0, sizeof outrel);
1653 /* h->dynindx may be -1 if the symbol was marked to
1654 become local. */
1655 else if (h != NULL
1656 && ((! info->symbolic && h->dynindx != -1)
1657 || (h->elf_link_hash_flags
1658 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1659 {
1660 BFD_ASSERT (h->dynindx != -1);
1661 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1662 outrel.r_addend = relocation + rel->r_addend;
1663 }
1664 else
1665 {
1666 if (r_type == R_68K_32)
1667 {
1668 relocate = true;
1669 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1670 outrel.r_addend = relocation + rel->r_addend;
1671 }
1672 else
1673 {
1674 long indx;
1675
1676 if (h == NULL)
1677 sec = local_sections[r_symndx];
1678 else
1679 {
1680 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1681 || (h->root.type
1682 == bfd_link_hash_defweak));
1683 sec = h->root.u.def.section;
1684 }
1685 if (sec != NULL && bfd_is_abs_section (sec))
1686 indx = 0;
1687 else if (sec == NULL || sec->owner == NULL)
1688 {
1689 bfd_set_error (bfd_error_bad_value);
1690 return false;
1691 }
1692 else
1693 {
1694 asection *osec;
1695
1696 osec = sec->output_section;
1697 indx = elf_section_data (osec)->dynindx;
1698 BFD_ASSERT (indx > 0);
1699 }
1700
1701 outrel.r_info = ELF32_R_INFO (indx, r_type);
1702 outrel.r_addend = relocation + rel->r_addend;
1703 }
1704 }
1705
1706 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1707 (((Elf32_External_Rela *)
1708 sreloc->contents)
1709 + sreloc->reloc_count));
1710 ++sreloc->reloc_count;
1711
1712 /* This reloc will be computed at runtime, so there's no
1713 need to do anything now, except for R_68K_32
1714 relocations that have been turned into
1715 R_68K_RELATIVE. */
1716 if (!relocate)
1717 continue;
1718 }
1719
1720 break;
1721
1722 case R_68K_GNU_VTINHERIT:
1723 case R_68K_GNU_VTENTRY:
1724 /* These are no-ops in the end. */
1725 continue;
1726
1727 default:
1728 break;
1729 }
1730
1731 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1732 contents, rel->r_offset,
1733 relocation, rel->r_addend);
1734
1735 if (r != bfd_reloc_ok)
1736 {
1737 switch (r)
1738 {
1739 default:
1740 case bfd_reloc_outofrange:
1741 abort ();
1742 case bfd_reloc_overflow:
1743 {
1744 const char *name;
1745
1746 if (h != NULL)
1747 name = h->root.root.string;
1748 else
1749 {
1750 name = bfd_elf_string_from_elf_section (input_bfd,
1751 symtab_hdr->sh_link,
1752 sym->st_name);
1753 if (name == NULL)
1754 return false;
1755 if (*name == '\0')
1756 name = bfd_section_name (input_bfd, sec);
1757 }
1758 if (!(info->callbacks->reloc_overflow
1759 (info, name, howto->name, (bfd_vma) 0,
1760 input_bfd, input_section, rel->r_offset)))
1761 return false;
1762 }
1763 break;
1764 }
1765 }
1766 }
1767
1768 return true;
1769 }
1770
1771 /* Finish up dynamic symbol handling. We set the contents of various
1772 dynamic sections here. */
1773
1774 static boolean
1775 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1776 bfd *output_bfd;
1777 struct bfd_link_info *info;
1778 struct elf_link_hash_entry *h;
1779 Elf_Internal_Sym *sym;
1780 {
1781 bfd *dynobj;
1782 int plt_off1, plt_off2, plt_off3;
1783
1784 dynobj = elf_hash_table (info)->dynobj;
1785
1786 if (h->plt.offset != (bfd_vma) -1)
1787 {
1788 asection *splt;
1789 asection *sgot;
1790 asection *srela;
1791 bfd_vma plt_index;
1792 bfd_vma got_offset;
1793 Elf_Internal_Rela rela;
1794
1795 /* This symbol has an entry in the procedure linkage table. Set
1796 it up. */
1797
1798 BFD_ASSERT (h->dynindx != -1);
1799
1800 splt = bfd_get_section_by_name (dynobj, ".plt");
1801 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1802 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1803 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1804
1805 /* Get the index in the procedure linkage table which
1806 corresponds to this symbol. This is the index of this symbol
1807 in all the symbols for which we are making plt entries. The
1808 first entry in the procedure linkage table is reserved. */
1809 if ( CPU32_FLAG (output_bfd))
1810 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1811 else
1812 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1813
1814 /* Get the offset into the .got table of the entry that
1815 corresponds to this function. Each .got entry is 4 bytes.
1816 The first three are reserved. */
1817 got_offset = (plt_index + 3) * 4;
1818
1819 if ( CPU32_FLAG (output_bfd))
1820 {
1821 /* Fill in the entry in the procedure linkage table. */
1822 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1823 PLT_CPU32_ENTRY_SIZE);
1824 plt_off1 = 4;
1825 plt_off2 = 12;
1826 plt_off3 = 18;
1827 }
1828 else
1829 {
1830 /* Fill in the entry in the procedure linkage table. */
1831 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1832 PLT_ENTRY_SIZE);
1833 plt_off1 = 4;
1834 plt_off2 = 10;
1835 plt_off3 = 16;
1836 }
1837
1838 /* The offset is relative to the first extension word. */
1839 bfd_put_32 (output_bfd,
1840 (sgot->output_section->vma
1841 + sgot->output_offset
1842 + got_offset
1843 - (splt->output_section->vma
1844 + h->plt.offset + 2)),
1845 splt->contents + h->plt.offset + plt_off1);
1846
1847 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1848 splt->contents + h->plt.offset + plt_off2);
1849 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1850 splt->contents + h->plt.offset + plt_off3);
1851
1852 /* Fill in the entry in the global offset table. */
1853 bfd_put_32 (output_bfd,
1854 (splt->output_section->vma
1855 + splt->output_offset
1856 + h->plt.offset
1857 + 8),
1858 sgot->contents + got_offset);
1859
1860 /* Fill in the entry in the .rela.plt section. */
1861 rela.r_offset = (sgot->output_section->vma
1862 + sgot->output_offset
1863 + got_offset);
1864 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1865 rela.r_addend = 0;
1866 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1867 ((Elf32_External_Rela *) srela->contents
1868 + plt_index));
1869
1870 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1871 {
1872 /* Mark the symbol as undefined, rather than as defined in
1873 the .plt section. Leave the value alone. */
1874 sym->st_shndx = SHN_UNDEF;
1875 }
1876 }
1877
1878 if (h->got.offset != (bfd_vma) -1)
1879 {
1880 asection *sgot;
1881 asection *srela;
1882 Elf_Internal_Rela rela;
1883
1884 /* This symbol has an entry in the global offset table. Set it
1885 up. */
1886
1887 sgot = bfd_get_section_by_name (dynobj, ".got");
1888 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1889 BFD_ASSERT (sgot != NULL && srela != NULL);
1890
1891 rela.r_offset = (sgot->output_section->vma
1892 + sgot->output_offset
1893 + (h->got.offset &~ (bfd_vma) 1));
1894
1895 /* If this is a -Bsymbolic link, and the symbol is defined
1896 locally, we just want to emit a RELATIVE reloc. Likewise if
1897 the symbol was forced to be local because of a version file.
1898 The entry in the global offset table will already have been
1899 initialized in the relocate_section function. */
1900 if (info->shared
1901 && (info->symbolic || h->dynindx == -1)
1902 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1903 {
1904 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1905 rela.r_addend = bfd_get_signed_32 (output_bfd,
1906 (sgot->contents
1907 + (h->got.offset &~ (bfd_vma) 1)));
1908 }
1909 else
1910 {
1911 bfd_put_32 (output_bfd, (bfd_vma) 0,
1912 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1913 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1914 rela.r_addend = 0;
1915 }
1916
1917 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1918 ((Elf32_External_Rela *) srela->contents
1919 + srela->reloc_count));
1920 ++srela->reloc_count;
1921 }
1922
1923 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1924 {
1925 asection *s;
1926 Elf_Internal_Rela rela;
1927
1928 /* This symbol needs a copy reloc. Set it up. */
1929
1930 BFD_ASSERT (h->dynindx != -1
1931 && (h->root.type == bfd_link_hash_defined
1932 || h->root.type == bfd_link_hash_defweak));
1933
1934 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1935 ".rela.bss");
1936 BFD_ASSERT (s != NULL);
1937
1938 rela.r_offset = (h->root.u.def.value
1939 + h->root.u.def.section->output_section->vma
1940 + h->root.u.def.section->output_offset);
1941 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1942 rela.r_addend = 0;
1943 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1944 ((Elf32_External_Rela *) s->contents
1945 + s->reloc_count));
1946 ++s->reloc_count;
1947 }
1948
1949 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1950 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1951 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1952 sym->st_shndx = SHN_ABS;
1953
1954 return true;
1955 }
1956
1957 /* Finish up the dynamic sections. */
1958
1959 static boolean
1960 elf_m68k_finish_dynamic_sections (output_bfd, info)
1961 bfd *output_bfd;
1962 struct bfd_link_info *info;
1963 {
1964 bfd *dynobj;
1965 asection *sgot;
1966 asection *sdyn;
1967
1968 dynobj = elf_hash_table (info)->dynobj;
1969
1970 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1971 BFD_ASSERT (sgot != NULL);
1972 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1973
1974 if (elf_hash_table (info)->dynamic_sections_created)
1975 {
1976 asection *splt;
1977 Elf32_External_Dyn *dyncon, *dynconend;
1978
1979 splt = bfd_get_section_by_name (dynobj, ".plt");
1980 BFD_ASSERT (splt != NULL && sdyn != NULL);
1981
1982 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1983 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1984 for (; dyncon < dynconend; dyncon++)
1985 {
1986 Elf_Internal_Dyn dyn;
1987 const char *name;
1988 asection *s;
1989
1990 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1991
1992 switch (dyn.d_tag)
1993 {
1994 default:
1995 break;
1996
1997 case DT_PLTGOT:
1998 name = ".got";
1999 goto get_vma;
2000 case DT_JMPREL:
2001 name = ".rela.plt";
2002 get_vma:
2003 s = bfd_get_section_by_name (output_bfd, name);
2004 BFD_ASSERT (s != NULL);
2005 dyn.d_un.d_ptr = s->vma;
2006 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2007 break;
2008
2009 case DT_PLTRELSZ:
2010 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2011 BFD_ASSERT (s != NULL);
2012 if (s->_cooked_size != 0)
2013 dyn.d_un.d_val = s->_cooked_size;
2014 else
2015 dyn.d_un.d_val = s->_raw_size;
2016 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2017 break;
2018
2019 case DT_RELASZ:
2020 /* The procedure linkage table relocs (DT_JMPREL) should
2021 not be included in the overall relocs (DT_RELA).
2022 Therefore, we override the DT_RELASZ entry here to
2023 make it not include the JMPREL relocs. Since the
2024 linker script arranges for .rela.plt to follow all
2025 other relocation sections, we don't have to worry
2026 about changing the DT_RELA entry. */
2027 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2028 if (s != NULL)
2029 {
2030 if (s->_cooked_size != 0)
2031 dyn.d_un.d_val -= s->_cooked_size;
2032 else
2033 dyn.d_un.d_val -= s->_raw_size;
2034 }
2035 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2036 break;
2037 }
2038 }
2039
2040 /* Fill in the first entry in the procedure linkage table. */
2041 if (splt->_raw_size > 0)
2042 {
2043 if (!CPU32_FLAG (output_bfd))
2044 {
2045 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2046 bfd_put_32 (output_bfd,
2047 (sgot->output_section->vma
2048 + sgot->output_offset + 4
2049 - (splt->output_section->vma + 2)),
2050 splt->contents + 4);
2051 bfd_put_32 (output_bfd,
2052 (sgot->output_section->vma
2053 + sgot->output_offset + 8
2054 - (splt->output_section->vma + 10)),
2055 splt->contents + 12);
2056 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2057 = PLT_ENTRY_SIZE;
2058 }
2059 else /* cpu32 */
2060 {
2061 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2062 bfd_put_32 (output_bfd,
2063 (sgot->output_section->vma
2064 + sgot->output_offset + 4
2065 - (splt->output_section->vma + 2)),
2066 splt->contents + 4);
2067 bfd_put_32 (output_bfd,
2068 (sgot->output_section->vma
2069 + sgot->output_offset + 8
2070 - (splt->output_section->vma + 10)),
2071 splt->contents + 12);
2072 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2073 = PLT_CPU32_ENTRY_SIZE;
2074 }
2075 }
2076 }
2077
2078 /* Fill in the first three entries in the global offset table. */
2079 if (sgot->_raw_size > 0)
2080 {
2081 if (sdyn == NULL)
2082 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2083 else
2084 bfd_put_32 (output_bfd,
2085 sdyn->output_section->vma + sdyn->output_offset,
2086 sgot->contents);
2087 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2088 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2089 }
2090
2091 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2092
2093 return true;
2094 }
2095
2096 /* Given a .data section and a .emreloc in-memory section, store
2097 relocation information into the .emreloc section which can be
2098 used at runtime to relocate the section. This is called by the
2099 linker when the --embedded-relocs switch is used. This is called
2100 after the add_symbols entry point has been called for all the
2101 objects, and before the final_link entry point is called. */
2102
2103 boolean
2104 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2105 bfd *abfd;
2106 struct bfd_link_info *info;
2107 asection *datasec;
2108 asection *relsec;
2109 char **errmsg;
2110 {
2111 Elf_Internal_Shdr *symtab_hdr;
2112 Elf_Internal_Sym *isymbuf = NULL;
2113 Elf_Internal_Rela *internal_relocs = NULL;
2114 Elf_Internal_Rela *irel, *irelend;
2115 bfd_byte *p;
2116 bfd_size_type amt;
2117
2118 BFD_ASSERT (! info->relocateable);
2119
2120 *errmsg = NULL;
2121
2122 if (datasec->reloc_count == 0)
2123 return true;
2124
2125 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2126
2127 /* Get a copy of the native relocations. */
2128 internal_relocs = (_bfd_elf32_link_read_relocs
2129 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2130 info->keep_memory));
2131 if (internal_relocs == NULL)
2132 goto error_return;
2133
2134 amt = (bfd_size_type) datasec->reloc_count * 12;
2135 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2136 if (relsec->contents == NULL)
2137 goto error_return;
2138
2139 p = relsec->contents;
2140
2141 irelend = internal_relocs + datasec->reloc_count;
2142 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2143 {
2144 asection *targetsec;
2145
2146 /* We are going to write a four byte longword into the runtime
2147 reloc section. The longword will be the address in the data
2148 section which must be relocated. It is followed by the name
2149 of the target section NUL-padded or truncated to 8
2150 characters. */
2151
2152 /* We can only relocate absolute longword relocs at run time. */
2153 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2154 {
2155 *errmsg = _("unsupported reloc type");
2156 bfd_set_error (bfd_error_bad_value);
2157 goto error_return;
2158 }
2159
2160 /* Get the target section referred to by the reloc. */
2161 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2162 {
2163 /* A local symbol. */
2164 Elf_Internal_Sym *isym;
2165
2166 /* Read this BFD's local symbols if we haven't done so already. */
2167 if (isymbuf == NULL)
2168 {
2169 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2170 if (isymbuf == NULL)
2171 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2172 symtab_hdr->sh_info, 0,
2173 NULL, NULL, NULL);
2174 if (isymbuf == NULL)
2175 goto error_return;
2176 }
2177
2178 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2179 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2180 }
2181 else
2182 {
2183 unsigned long indx;
2184 struct elf_link_hash_entry *h;
2185
2186 /* An external symbol. */
2187 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2188 h = elf_sym_hashes (abfd)[indx];
2189 BFD_ASSERT (h != NULL);
2190 if (h->root.type == bfd_link_hash_defined
2191 || h->root.type == bfd_link_hash_defweak)
2192 targetsec = h->root.u.def.section;
2193 else
2194 targetsec = NULL;
2195 }
2196
2197 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2198 memset (p + 4, 0, 8);
2199 if (targetsec != NULL)
2200 strncpy (p + 4, targetsec->output_section->name, 8);
2201 }
2202
2203 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2204 free (isymbuf);
2205 if (internal_relocs != NULL
2206 && elf_section_data (datasec)->relocs != internal_relocs)
2207 free (internal_relocs);
2208 return true;
2209
2210 error_return:
2211 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2212 free (isymbuf);
2213 if (internal_relocs != NULL
2214 && elf_section_data (datasec)->relocs != internal_relocs)
2215 free (internal_relocs);
2216 return false;
2217 }
2218
2219 static enum elf_reloc_type_class
2220 elf32_m68k_reloc_type_class (rela)
2221 const Elf_Internal_Rela *rela;
2222 {
2223 switch ((int) ELF32_R_TYPE (rela->r_info))
2224 {
2225 case R_68K_RELATIVE:
2226 return reloc_class_relative;
2227 case R_68K_JMP_SLOT:
2228 return reloc_class_plt;
2229 case R_68K_COPY:
2230 return reloc_class_copy;
2231 default:
2232 return reloc_class_normal;
2233 }
2234 }
2235
2236 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2237 #define TARGET_BIG_NAME "elf32-m68k"
2238 #define ELF_MACHINE_CODE EM_68K
2239 #define ELF_MAXPAGESIZE 0x2000
2240 #define elf_backend_create_dynamic_sections \
2241 _bfd_elf_create_dynamic_sections
2242 #define bfd_elf32_bfd_link_hash_table_create \
2243 elf_m68k_link_hash_table_create
2244 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2245
2246 #define elf_backend_check_relocs elf_m68k_check_relocs
2247 #define elf_backend_adjust_dynamic_symbol \
2248 elf_m68k_adjust_dynamic_symbol
2249 #define elf_backend_size_dynamic_sections \
2250 elf_m68k_size_dynamic_sections
2251 #define elf_backend_relocate_section elf_m68k_relocate_section
2252 #define elf_backend_finish_dynamic_symbol \
2253 elf_m68k_finish_dynamic_symbol
2254 #define elf_backend_finish_dynamic_sections \
2255 elf_m68k_finish_dynamic_sections
2256 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2257 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2258 #define bfd_elf32_bfd_merge_private_bfd_data \
2259 elf32_m68k_merge_private_bfd_data
2260 #define bfd_elf32_bfd_set_private_flags \
2261 elf32_m68k_set_private_flags
2262 #define bfd_elf32_bfd_print_private_bfd_data \
2263 elf32_m68k_print_private_bfd_data
2264 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2265
2266 #define elf_backend_can_gc_sections 1
2267 #define elf_backend_can_refcount 1
2268 #define elf_backend_want_got_plt 1
2269 #define elf_backend_plt_readonly 1
2270 #define elf_backend_want_plt_sym 0
2271 #define elf_backend_got_header_size 12
2272 #define elf_backend_rela_normal 1
2273
2274 #include "elf32-target.h"
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