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* symbols.c: Replace CONST by const throughout.
[binutils.git] / bfd / elf32-m68k.c
blob2006652cb3ee6fa21962a9d3bd5357602d9e5ce1
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 ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
41 struct elf_link_hash_entry *, Elf_Internal_Sym *));
42 static boolean elf_m68k_gc_sweep_hook
43 PARAMS ((bfd *, struct bfd_link_info *, asection *,
44 const Elf_Internal_Rela *));
45 static boolean elf_m68k_adjust_dynamic_symbol
46 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
47 static boolean elf_m68k_size_dynamic_sections
48 PARAMS ((bfd *, struct bfd_link_info *));
49 static boolean elf_m68k_relocate_section
50 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
51 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
52 static boolean elf_m68k_finish_dynamic_symbol
53 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
54 Elf_Internal_Sym *));
55 static boolean elf_m68k_finish_dynamic_sections
56 PARAMS ((bfd *, struct bfd_link_info *));
57
58 static boolean elf32_m68k_set_private_flags
59 PARAMS ((bfd *, flagword));
60 static boolean elf32_m68k_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
184 #define USE_RELA
185 \f
186 /* Functions for the m68k ELF linker. */
187
188 /* The name of the dynamic interpreter. This is put in the .interp
189 section. */
190
191 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
192
193 /* The size in bytes of an entry in the procedure linkage table. */
194
195 #define PLT_ENTRY_SIZE 20
196
197 /* The first entry in a procedure linkage table looks like this. See
198 the SVR4 ABI m68k supplement to see how this works. */
199
200 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
201 {
202 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
203 0, 0, 0, 0, /* replaced with offset to .got + 4. */
204 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
205 0, 0, 0, 0, /* replaced with offset to .got + 8. */
206 0, 0, 0, 0 /* pad out to 20 bytes. */
207 };
208
209 /* Subsequent entries in a procedure linkage table look like this. */
210
211 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
212 {
213 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
214 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
215 0x2f, 0x3c, /* move.l #offset,-(%sp) */
216 0, 0, 0, 0, /* replaced with offset into relocation table. */
217 0x60, 0xff, /* bra.l .plt */
218 0, 0, 0, 0 /* replaced with offset to start of .plt. */
219 };
220
221 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
222
223 #define PLT_CPU32_ENTRY_SIZE 24
224 /* Procedure linkage table entries for the cpu32 */
225 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
226 {
227 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
228 0, 0, 0, 0, /* replaced with offset to .got + 4. */
229 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
230 0, 0, 0, 0, /* replace with offset to .got +8. */
231 0x4e, 0xd1, /* jmp %a1@ */
232 0, 0, 0, 0, /* pad out to 24 bytes. */
233 0, 0
234 };
235
236 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
237 {
238 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
239 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
240 0x4e, 0xd1, /* jmp %a1@ */
241 0x2f, 0x3c, /* move.l #offset,-(%sp) */
242 0, 0, 0, 0, /* replaced with offset into relocation table. */
243 0x60, 0xff, /* bra.l .plt */
244 0, 0, 0, 0, /* replaced with offset to start of .plt. */
245 0, 0
246 };
247
248 /* The m68k linker needs to keep track of the number of relocs that it
249 decides to copy in check_relocs for each symbol. This is so that it
250 can discard PC relative relocs if it doesn't need them when linking
251 with -Bsymbolic. We store the information in a field extending the
252 regular ELF linker hash table. */
253
254 /* This structure keeps track of the number of PC relative relocs we have
255 copied for a given symbol. */
256
257 struct elf_m68k_pcrel_relocs_copied
258 {
259 /* Next section. */
260 struct elf_m68k_pcrel_relocs_copied *next;
261 /* A section in dynobj. */
262 asection *section;
263 /* Number of relocs copied in this section. */
264 bfd_size_type count;
265 };
266
267 /* m68k ELF linker hash entry. */
268
269 struct elf_m68k_link_hash_entry
270 {
271 struct elf_link_hash_entry root;
272
273 /* Number of PC relative relocs copied for this symbol. */
274 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
275 };
276
277 /* m68k ELF linker hash table. */
278
279 struct elf_m68k_link_hash_table
280 {
281 struct elf_link_hash_table root;
282 };
283
284 /* Declare this now that the above structures are defined. */
285
286 static boolean elf_m68k_discard_copies
287 PARAMS ((struct elf_m68k_link_hash_entry *, PTR));
288
289 /* Traverse an m68k ELF linker hash table. */
290
291 #define elf_m68k_link_hash_traverse(table, func, info) \
292 (elf_link_hash_traverse \
293 (&(table)->root, \
294 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
295 (info)))
296
297 /* Get the m68k ELF linker hash table from a link_info structure. */
298
299 #define elf_m68k_hash_table(p) \
300 ((struct elf_m68k_link_hash_table *) (p)->hash)
301
302 /* Create an entry in an m68k ELF linker hash table. */
303
304 static struct bfd_hash_entry *
305 elf_m68k_link_hash_newfunc (entry, table, string)
306 struct bfd_hash_entry *entry;
307 struct bfd_hash_table *table;
308 const char *string;
309 {
310 struct elf_m68k_link_hash_entry *ret =
311 (struct elf_m68k_link_hash_entry *) entry;
312
313 /* Allocate the structure if it has not already been allocated by a
314 subclass. */
315 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
316 ret = ((struct elf_m68k_link_hash_entry *)
317 bfd_hash_allocate (table,
318 sizeof (struct elf_m68k_link_hash_entry)));
319 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
320 return (struct bfd_hash_entry *) ret;
321
322 /* Call the allocation method of the superclass. */
323 ret = ((struct elf_m68k_link_hash_entry *)
324 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
325 table, string));
326 if (ret != (struct elf_m68k_link_hash_entry *) NULL)
327 {
328 ret->pcrel_relocs_copied = NULL;
329 }
330
331 return (struct bfd_hash_entry *) ret;
332 }
333
334 /* Create an m68k ELF linker hash table. */
335
336 static struct bfd_link_hash_table *
337 elf_m68k_link_hash_table_create (abfd)
338 bfd *abfd;
339 {
340 struct elf_m68k_link_hash_table *ret;
341 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table);
342
343 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt);
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 free (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 /* Merge backend specific data from an object file to the output
369 object file when linking. */
370 static boolean
371 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
372 bfd *ibfd;
373 bfd *obfd;
374 {
375 flagword out_flags;
376 flagword in_flags;
377
378 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
379 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
380 return true;
381
382 in_flags = elf_elfheader (ibfd)->e_flags;
383 out_flags = elf_elfheader (obfd)->e_flags;
384
385 if (!elf_flags_init (obfd))
386 {
387 elf_flags_init (obfd) = true;
388 elf_elfheader (obfd)->e_flags = in_flags;
389 }
390
391 return true;
392 }
393
394 /* Display the flags field */
395 static boolean
396 elf32_m68k_print_private_bfd_data (abfd, ptr)
397 bfd *abfd;
398 PTR ptr;
399 {
400 FILE *file = (FILE *) ptr;
401
402 BFD_ASSERT (abfd != NULL && ptr != NULL);
403
404 /* Print normal ELF private data. */
405 _bfd_elf_print_private_bfd_data (abfd, ptr);
406
407 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
408
409 /* xgettext:c-format */
410 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
411
412 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
413 fprintf (file, _(" [cpu32]"));
414
415 if (elf_elfheader (abfd)->e_flags & EF_M68000)
416 fprintf (file, _(" [m68000]"));
417
418 fputc ('\n', file);
419
420 return true;
421 }
422 /* Look through the relocs for a section during the first phase, and
423 allocate space in the global offset table or procedure linkage
424 table. */
425
426 static boolean
427 elf_m68k_check_relocs (abfd, info, sec, relocs)
428 bfd *abfd;
429 struct bfd_link_info *info;
430 asection *sec;
431 const Elf_Internal_Rela *relocs;
432 {
433 bfd *dynobj;
434 Elf_Internal_Shdr *symtab_hdr;
435 struct elf_link_hash_entry **sym_hashes;
436 bfd_signed_vma *local_got_refcounts;
437 const Elf_Internal_Rela *rel;
438 const Elf_Internal_Rela *rel_end;
439 asection *sgot;
440 asection *srelgot;
441 asection *sreloc;
442
443 if (info->relocateable)
444 return true;
445
446 dynobj = elf_hash_table (info)->dynobj;
447 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
448 sym_hashes = elf_sym_hashes (abfd);
449 local_got_refcounts = elf_local_got_refcounts (abfd);
450
451 sgot = NULL;
452 srelgot = NULL;
453 sreloc = NULL;
454
455 rel_end = relocs + sec->reloc_count;
456 for (rel = relocs; rel < rel_end; rel++)
457 {
458 unsigned long r_symndx;
459 struct elf_link_hash_entry *h;
460
461 r_symndx = ELF32_R_SYM (rel->r_info);
462
463 if (r_symndx < symtab_hdr->sh_info)
464 h = NULL;
465 else
466 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
467
468 switch (ELF32_R_TYPE (rel->r_info))
469 {
470 case R_68K_GOT8:
471 case R_68K_GOT16:
472 case R_68K_GOT32:
473 if (h != NULL
474 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
475 break;
476 /* Fall through. */
477 case R_68K_GOT8O:
478 case R_68K_GOT16O:
479 case R_68K_GOT32O:
480 /* This symbol requires a global offset table entry. */
481
482 if (dynobj == NULL)
483 {
484 /* Create the .got section. */
485 elf_hash_table (info)->dynobj = dynobj = abfd;
486 if (!_bfd_elf_create_got_section (dynobj, info))
487 return false;
488 }
489
490 if (sgot == NULL)
491 {
492 sgot = bfd_get_section_by_name (dynobj, ".got");
493 BFD_ASSERT (sgot != NULL);
494 }
495
496 if (srelgot == NULL
497 && (h != NULL || info->shared))
498 {
499 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
500 if (srelgot == NULL)
501 {
502 srelgot = bfd_make_section (dynobj, ".rela.got");
503 if (srelgot == NULL
504 || !bfd_set_section_flags (dynobj, srelgot,
505 (SEC_ALLOC
506 | SEC_LOAD
507 | SEC_HAS_CONTENTS
508 | SEC_IN_MEMORY
509 | SEC_LINKER_CREATED
510 | SEC_READONLY))
511 || !bfd_set_section_alignment (dynobj, srelgot, 2))
512 return false;
513 }
514 }
515
516 if (h != NULL)
517 {
518 if (h->got.refcount == 0)
519 {
520 /* Make sure this symbol is output as a dynamic symbol. */
521 if (h->dynindx == -1)
522 {
523 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
524 return false;
525 }
526
527 /* Allocate space in the .got section. */
528 sgot->_raw_size += 4;
529 /* Allocate relocation space. */
530 srelgot->_raw_size += sizeof (Elf32_External_Rela);
531 }
532 h->got.refcount++;
533 }
534 else
535 {
536 /* This is a global offset table entry for a local symbol. */
537 if (local_got_refcounts == NULL)
538 {
539 bfd_size_type size;
540
541 size = symtab_hdr->sh_info;
542 size *= sizeof (bfd_signed_vma);
543 local_got_refcounts = ((bfd_signed_vma *)
544 bfd_zalloc (abfd, size));
545 if (local_got_refcounts == NULL)
546 return false;
547 elf_local_got_refcounts (abfd) = local_got_refcounts;
548 }
549 if (local_got_refcounts[r_symndx] == 0)
550 {
551 sgot->_raw_size += 4;
552 if (info->shared)
553 {
554 /* If we are generating a shared object, we need to
555 output a R_68K_RELATIVE reloc so that the dynamic
556 linker can adjust this GOT entry. */
557 srelgot->_raw_size += sizeof (Elf32_External_Rela);
558 }
559 }
560 local_got_refcounts[r_symndx]++;
561 }
562 break;
563
564 case R_68K_PLT8:
565 case R_68K_PLT16:
566 case R_68K_PLT32:
567 /* This symbol requires a procedure linkage table entry. We
568 actually build the entry in adjust_dynamic_symbol,
569 because this might be a case of linking PIC code which is
570 never referenced by a dynamic object, in which case we
571 don't need to generate a procedure linkage table entry
572 after all. */
573
574 /* If this is a local symbol, we resolve it directly without
575 creating a procedure linkage table entry. */
576 if (h == NULL)
577 continue;
578
579 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
580 h->plt.refcount++;
581 break;
582
583 case R_68K_PLT8O:
584 case R_68K_PLT16O:
585 case R_68K_PLT32O:
586 /* This symbol requires a procedure linkage table entry. */
587
588 if (h == NULL)
589 {
590 /* It does not make sense to have this relocation for a
591 local symbol. FIXME: does it? How to handle it if
592 it does make sense? */
593 bfd_set_error (bfd_error_bad_value);
594 return false;
595 }
596
597 /* Make sure this symbol is output as a dynamic symbol. */
598 if (h->dynindx == -1)
599 {
600 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
601 return false;
602 }
603
604 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
605 h->plt.refcount++;
606 break;
607
608 case R_68K_PC8:
609 case R_68K_PC16:
610 case R_68K_PC32:
611 /* If we are creating a shared library and this is not a local
612 symbol, we need to copy the reloc into the shared library.
613 However when linking with -Bsymbolic and this is a global
614 symbol which is defined in an object we are including in the
615 link (i.e., DEF_REGULAR is set), then we can resolve the
616 reloc directly. At this point we have not seen all the input
617 files, so it is possible that DEF_REGULAR is not set now but
618 will be set later (it is never cleared). We account for that
619 possibility below by storing information in the
620 pcrel_relocs_copied field of the hash table entry. */
621 if (!(info->shared
622 && (sec->flags & SEC_ALLOC) != 0
623 && h != NULL
624 && (!info->symbolic
625 || (h->elf_link_hash_flags
626 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
627 {
628 if (h != NULL)
629 {
630 /* Make sure a plt entry is created for this symbol if
631 it turns out to be a function defined by a dynamic
632 object. */
633 h->plt.refcount++;
634 }
635 break;
636 }
637 /* Fall through. */
638 case R_68K_8:
639 case R_68K_16:
640 case R_68K_32:
641 if (h != NULL)
642 {
643 /* Make sure a plt entry is created for this symbol if it
644 turns out to be a function defined by a dynamic object. */
645 h->plt.refcount++;
646 }
647
648 /* If we are creating a shared library, we need to copy the
649 reloc into the shared library. */
650 if (info->shared
651 && (sec->flags & SEC_ALLOC) != 0)
652 {
653 /* When creating a shared object, we must copy these
654 reloc types into the output file. We create a reloc
655 section in dynobj and make room for this reloc. */
656 if (sreloc == NULL)
657 {
658 const char *name;
659
660 name = (bfd_elf_string_from_elf_section
661 (abfd,
662 elf_elfheader (abfd)->e_shstrndx,
663 elf_section_data (sec)->rel_hdr.sh_name));
664 if (name == NULL)
665 return false;
666
667 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
668 && strcmp (bfd_get_section_name (abfd, sec),
669 name + 5) == 0);
670
671 sreloc = bfd_get_section_by_name (dynobj, name);
672 if (sreloc == NULL)
673 {
674 sreloc = bfd_make_section (dynobj, name);
675 if (sreloc == NULL
676 || !bfd_set_section_flags (dynobj, sreloc,
677 (SEC_ALLOC
678 | SEC_LOAD
679 | SEC_HAS_CONTENTS
680 | SEC_IN_MEMORY
681 | SEC_LINKER_CREATED
682 | SEC_READONLY))
683 || !bfd_set_section_alignment (dynobj, sreloc, 2))
684 return false;
685 }
686 if (sec->flags & SEC_READONLY)
687 info->flags |= DF_TEXTREL;
688 }
689
690 sreloc->_raw_size += sizeof (Elf32_External_Rela);
691
692 /* If we are linking with -Bsymbolic, we count the number of
693 PC relative relocations we have entered for this symbol,
694 so that we can discard them again if the symbol is later
695 defined by a regular object. Note that this function is
696 only called if we are using an m68kelf linker hash table,
697 which means that h is really a pointer to an
698 elf_m68k_link_hash_entry. */
699 if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8
700 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
701 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
702 && info->symbolic)
703 {
704 struct elf_m68k_link_hash_entry *eh;
705 struct elf_m68k_pcrel_relocs_copied *p;
706
707 eh = (struct elf_m68k_link_hash_entry *) h;
708
709 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
710 if (p->section == sreloc)
711 break;
712
713 if (p == NULL)
714 {
715 p = ((struct elf_m68k_pcrel_relocs_copied *)
716 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
717 if (p == NULL)
718 return false;
719 p->next = eh->pcrel_relocs_copied;
720 eh->pcrel_relocs_copied = p;
721 p->section = sreloc;
722 p->count = 0;
723 }
724
725 ++p->count;
726 }
727 }
728
729 break;
730
731 /* This relocation describes the C++ object vtable hierarchy.
732 Reconstruct it for later use during GC. */
733 case R_68K_GNU_VTINHERIT:
734 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
735 return false;
736 break;
737
738 /* This relocation describes which C++ vtable entries are actually
739 used. Record for later use during GC. */
740 case R_68K_GNU_VTENTRY:
741 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
742 return false;
743 break;
744
745 default:
746 break;
747 }
748 }
749
750 return true;
751 }
752
753 /* Return the section that should be marked against GC for a given
754 relocation. */
755
756 static asection *
757 elf_m68k_gc_mark_hook (abfd, info, rel, h, sym)
758 bfd *abfd;
759 struct bfd_link_info *info ATTRIBUTE_UNUSED;
760 Elf_Internal_Rela *rel;
761 struct elf_link_hash_entry *h;
762 Elf_Internal_Sym *sym;
763 {
764 if (h != NULL)
765 {
766 switch (ELF32_R_TYPE (rel->r_info))
767 {
768 case R_68K_GNU_VTINHERIT:
769 case R_68K_GNU_VTENTRY:
770 break;
771
772 default:
773 switch (h->root.type)
774 {
775 default:
776 break;
777
778 case bfd_link_hash_defined:
779 case bfd_link_hash_defweak:
780 return h->root.u.def.section;
781
782 case bfd_link_hash_common:
783 return h->root.u.c.p->section;
784 }
785 }
786 }
787 else
788 {
789 return bfd_section_from_elf_index (abfd, sym->st_shndx);
790 }
791
792 return NULL;
793 }
794
795 /* Update the got entry reference counts for the section being removed. */
796
797 static boolean
798 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
799 bfd *abfd;
800 struct bfd_link_info *info;
801 asection *sec;
802 const Elf_Internal_Rela *relocs;
803 {
804 Elf_Internal_Shdr *symtab_hdr;
805 struct elf_link_hash_entry **sym_hashes;
806 bfd_signed_vma *local_got_refcounts;
807 const Elf_Internal_Rela *rel, *relend;
808 unsigned long r_symndx;
809 struct elf_link_hash_entry *h;
810 bfd *dynobj;
811 asection *sgot;
812 asection *srelgot;
813
814 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
815 sym_hashes = elf_sym_hashes (abfd);
816 local_got_refcounts = elf_local_got_refcounts (abfd);
817
818 dynobj = elf_hash_table (info)->dynobj;
819 if (dynobj == NULL)
820 return true;
821
822 sgot = bfd_get_section_by_name (dynobj, ".got");
823 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
824
825 relend = relocs + sec->reloc_count;
826 for (rel = relocs; rel < relend; rel++)
827 {
828 switch (ELF32_R_TYPE (rel->r_info))
829 {
830 case R_68K_GOT8:
831 case R_68K_GOT16:
832 case R_68K_GOT32:
833 case R_68K_GOT8O:
834 case R_68K_GOT16O:
835 case R_68K_GOT32O:
836 r_symndx = ELF32_R_SYM (rel->r_info);
837 if (r_symndx >= symtab_hdr->sh_info)
838 {
839 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
840 if (h->got.refcount > 0)
841 {
842 --h->got.refcount;
843 if (h->got.refcount == 0)
844 {
845 /* We don't need the .got entry any more. */
846 sgot->_raw_size -= 4;
847 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
848 }
849 }
850 }
851 else if (local_got_refcounts != NULL)
852 {
853 if (local_got_refcounts[r_symndx] > 0)
854 {
855 --local_got_refcounts[r_symndx];
856 if (local_got_refcounts[r_symndx] == 0)
857 {
858 /* We don't need the .got entry any more. */
859 sgot->_raw_size -= 4;
860 if (info->shared)
861 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
862 }
863 }
864 }
865 break;
866
867 case R_68K_PLT8:
868 case R_68K_PLT16:
869 case R_68K_PLT32:
870 case R_68K_PLT8O:
871 case R_68K_PLT16O:
872 case R_68K_PLT32O:
873 case R_68K_PC8:
874 case R_68K_PC16:
875 case R_68K_PC32:
876 case R_68K_8:
877 case R_68K_16:
878 case R_68K_32:
879 r_symndx = ELF32_R_SYM (rel->r_info);
880 if (r_symndx >= symtab_hdr->sh_info)
881 {
882 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
883 if (h->plt.refcount > 0)
884 --h->plt.refcount;
885 }
886 break;
887
888 default:
889 break;
890 }
891 }
892
893 return true;
894 }
895
896 /* Adjust a symbol defined by a dynamic object and referenced by a
897 regular object. The current definition is in some section of the
898 dynamic object, but we're not including those sections. We have to
899 change the definition to something the rest of the link can
900 understand. */
901
902 static boolean
903 elf_m68k_adjust_dynamic_symbol (info, h)
904 struct bfd_link_info *info;
905 struct elf_link_hash_entry *h;
906 {
907 bfd *dynobj;
908 asection *s;
909 unsigned int power_of_two;
910
911 dynobj = elf_hash_table (info)->dynobj;
912
913 /* Make sure we know what is going on here. */
914 BFD_ASSERT (dynobj != NULL
915 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
916 || h->weakdef != NULL
917 || ((h->elf_link_hash_flags
918 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
919 && (h->elf_link_hash_flags
920 & ELF_LINK_HASH_REF_REGULAR) != 0
921 && (h->elf_link_hash_flags
922 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
923
924 /* If this is a function, put it in the procedure linkage table. We
925 will fill in the contents of the procedure linkage table later,
926 when we know the address of the .got section. */
927 if (h->type == STT_FUNC
928 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
929 {
930 if (! info->shared
931 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
932 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
933 /* We must always create the plt entry if it was referenced
934 by a PLTxxO relocation. In this case we already recorded
935 it as a dynamic symbol. */
936 && h->dynindx == -1)
937 {
938 /* This case can occur if we saw a PLTxx reloc in an input
939 file, but the symbol was never referred to by a dynamic
940 object. In such a case, we don't actually need to build
941 a procedure linkage table, and we can just do a PCxx
942 reloc instead. */
943 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
944 h->plt.offset = (bfd_vma) -1;
945 return true;
946 }
947
948 /* GC may have rendered this entry unused. */
949 if (h->plt.refcount <= 0)
950 {
951 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
952 h->plt.offset = (bfd_vma) -1;
953 return true;
954 }
955
956 /* Make sure this symbol is output as a dynamic symbol. */
957 if (h->dynindx == -1)
958 {
959 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
960 return false;
961 }
962
963 s = bfd_get_section_by_name (dynobj, ".plt");
964 BFD_ASSERT (s != NULL);
965
966 /* If this is the first .plt entry, make room for the special
967 first entry. */
968 if (s->_raw_size == 0)
969 {
970 if (CPU32_FLAG (dynobj))
971 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
972 else
973 s->_raw_size += PLT_ENTRY_SIZE;
974 }
975
976 /* If this symbol is not defined in a regular file, and we are
977 not generating a shared library, then set the symbol to this
978 location in the .plt. This is required to make function
979 pointers compare as equal between the normal executable and
980 the shared library. */
981 if (!info->shared
982 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
983 {
984 h->root.u.def.section = s;
985 h->root.u.def.value = s->_raw_size;
986 }
987
988 h->plt.offset = s->_raw_size;
989
990 /* Make room for this entry. */
991 if (CPU32_FLAG (dynobj))
992 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
993 else
994 s->_raw_size += PLT_ENTRY_SIZE;
995
996 /* We also need to make an entry in the .got.plt section, which
997 will be placed in the .got section by the linker script. */
998
999 s = bfd_get_section_by_name (dynobj, ".got.plt");
1000 BFD_ASSERT (s != NULL);
1001 s->_raw_size += 4;
1002
1003 /* We also need to make an entry in the .rela.plt section. */
1004
1005 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1006 BFD_ASSERT (s != NULL);
1007 s->_raw_size += sizeof (Elf32_External_Rela);
1008
1009 return true;
1010 }
1011
1012 /* Reinitialize the plt offset now that it is not used as a reference
1013 count any more. */
1014 h->plt.offset = (bfd_vma) -1;
1015
1016 /* If this is a weak symbol, and there is a real definition, the
1017 processor independent code will have arranged for us to see the
1018 real definition first, and we can just use the same value. */
1019 if (h->weakdef != NULL)
1020 {
1021 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1022 || h->weakdef->root.type == bfd_link_hash_defweak);
1023 h->root.u.def.section = h->weakdef->root.u.def.section;
1024 h->root.u.def.value = h->weakdef->root.u.def.value;
1025 return true;
1026 }
1027
1028 /* This is a reference to a symbol defined by a dynamic object which
1029 is not a function. */
1030
1031 /* If we are creating a shared library, we must presume that the
1032 only references to the symbol are via the global offset table.
1033 For such cases we need not do anything here; the relocations will
1034 be handled correctly by relocate_section. */
1035 if (info->shared)
1036 return true;
1037
1038 /* We must allocate the symbol in our .dynbss section, which will
1039 become part of the .bss section of the executable. There will be
1040 an entry for this symbol in the .dynsym section. The dynamic
1041 object will contain position independent code, so all references
1042 from the dynamic object to this symbol will go through the global
1043 offset table. The dynamic linker will use the .dynsym entry to
1044 determine the address it must put in the global offset table, so
1045 both the dynamic object and the regular object will refer to the
1046 same memory location for the variable. */
1047
1048 s = bfd_get_section_by_name (dynobj, ".dynbss");
1049 BFD_ASSERT (s != NULL);
1050
1051 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1052 copy the initial value out of the dynamic object and into the
1053 runtime process image. We need to remember the offset into the
1054 .rela.bss section we are going to use. */
1055 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1056 {
1057 asection *srel;
1058
1059 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1060 BFD_ASSERT (srel != NULL);
1061 srel->_raw_size += sizeof (Elf32_External_Rela);
1062 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1063 }
1064
1065 /* We need to figure out the alignment required for this symbol. I
1066 have no idea how ELF linkers handle this. */
1067 power_of_two = bfd_log2 (h->size);
1068 if (power_of_two > 3)
1069 power_of_two = 3;
1070
1071 /* Apply the required alignment. */
1072 s->_raw_size = BFD_ALIGN (s->_raw_size,
1073 (bfd_size_type) (1 << power_of_two));
1074 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1075 {
1076 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1077 return false;
1078 }
1079
1080 /* Define the symbol as being at this point in the section. */
1081 h->root.u.def.section = s;
1082 h->root.u.def.value = s->_raw_size;
1083
1084 /* Increment the section size to make room for the symbol. */
1085 s->_raw_size += h->size;
1086
1087 return true;
1088 }
1089
1090 /* Set the sizes of the dynamic sections. */
1091
1092 static boolean
1093 elf_m68k_size_dynamic_sections (output_bfd, info)
1094 bfd *output_bfd ATTRIBUTE_UNUSED;
1095 struct bfd_link_info *info;
1096 {
1097 bfd *dynobj;
1098 asection *s;
1099 boolean plt;
1100 boolean relocs;
1101
1102 dynobj = elf_hash_table (info)->dynobj;
1103 BFD_ASSERT (dynobj != NULL);
1104
1105 if (elf_hash_table (info)->dynamic_sections_created)
1106 {
1107 /* Set the contents of the .interp section to the interpreter. */
1108 if (!info->shared)
1109 {
1110 s = bfd_get_section_by_name (dynobj, ".interp");
1111 BFD_ASSERT (s != NULL);
1112 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1113 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1114 }
1115 }
1116 else
1117 {
1118 /* We may have created entries in the .rela.got section.
1119 However, if we are not creating the dynamic sections, we will
1120 not actually use these entries. Reset the size of .rela.got,
1121 which will cause it to get stripped from the output file
1122 below. */
1123 s = bfd_get_section_by_name (dynobj, ".rela.got");
1124 if (s != NULL)
1125 s->_raw_size = 0;
1126 }
1127
1128 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1129 relative relocs against symbols defined in a regular object. We
1130 allocated space for them in the check_relocs routine, but we will not
1131 fill them in in the relocate_section routine. */
1132 if (info->shared && info->symbolic)
1133 elf_m68k_link_hash_traverse (elf_m68k_hash_table (info),
1134 elf_m68k_discard_copies,
1135 (PTR) NULL);
1136
1137 /* The check_relocs and adjust_dynamic_symbol entry points have
1138 determined the sizes of the various dynamic sections. Allocate
1139 memory for them. */
1140 plt = false;
1141 relocs = false;
1142 for (s = dynobj->sections; s != NULL; s = s->next)
1143 {
1144 const char *name;
1145 boolean strip;
1146
1147 if ((s->flags & SEC_LINKER_CREATED) == 0)
1148 continue;
1149
1150 /* It's OK to base decisions on the section name, because none
1151 of the dynobj section names depend upon the input files. */
1152 name = bfd_get_section_name (dynobj, s);
1153
1154 strip = false;
1155
1156 if (strcmp (name, ".plt") == 0)
1157 {
1158 if (s->_raw_size == 0)
1159 {
1160 /* Strip this section if we don't need it; see the
1161 comment below. */
1162 strip = true;
1163 }
1164 else
1165 {
1166 /* Remember whether there is a PLT. */
1167 plt = true;
1168 }
1169 }
1170 else if (strncmp (name, ".rela", 5) == 0)
1171 {
1172 if (s->_raw_size == 0)
1173 {
1174 /* If we don't need this section, strip it from the
1175 output file. This is mostly to handle .rela.bss and
1176 .rela.plt. We must create both sections in
1177 create_dynamic_sections, because they must be created
1178 before the linker maps input sections to output
1179 sections. The linker does that before
1180 adjust_dynamic_symbol is called, and it is that
1181 function which decides whether anything needs to go
1182 into these sections. */
1183 strip = true;
1184 }
1185 else
1186 {
1187 relocs = true;
1188
1189 /* We use the reloc_count field as a counter if we need
1190 to copy relocs into the output file. */
1191 s->reloc_count = 0;
1192 }
1193 }
1194 else if (strncmp (name, ".got", 4) != 0)
1195 {
1196 /* It's not one of our sections, so don't allocate space. */
1197 continue;
1198 }
1199
1200 if (strip)
1201 {
1202 _bfd_strip_section_from_output (info, s);
1203 continue;
1204 }
1205
1206 /* Allocate memory for the section contents. */
1207 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1208 Unused entries should be reclaimed before the section's contents
1209 are written out, but at the moment this does not happen. Thus in
1210 order to prevent writing out garbage, we initialise the section's
1211 contents to zero. */
1212 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1213 if (s->contents == NULL && s->_raw_size != 0)
1214 return false;
1215 }
1216
1217 if (elf_hash_table (info)->dynamic_sections_created)
1218 {
1219 /* Add some entries to the .dynamic section. We fill in the
1220 values later, in elf_m68k_finish_dynamic_sections, but we
1221 must add the entries now so that we get the correct size for
1222 the .dynamic section. The DT_DEBUG entry is filled in by the
1223 dynamic linker and used by the debugger. */
1224 #define add_dynamic_entry(TAG, VAL) \
1225 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1226
1227 if (!info->shared)
1228 {
1229 if (!add_dynamic_entry (DT_DEBUG, 0))
1230 return false;
1231 }
1232
1233 if (plt)
1234 {
1235 if (!add_dynamic_entry (DT_PLTGOT, 0)
1236 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1237 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1238 || !add_dynamic_entry (DT_JMPREL, 0))
1239 return false;
1240 }
1241
1242 if (relocs)
1243 {
1244 if (!add_dynamic_entry (DT_RELA, 0)
1245 || !add_dynamic_entry (DT_RELASZ, 0)
1246 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1247 return false;
1248 }
1249
1250 if ((info->flags & DF_TEXTREL) != 0)
1251 {
1252 if (!add_dynamic_entry (DT_TEXTREL, 0))
1253 return false;
1254 }
1255 }
1256 #undef add_dynamic_entry
1257
1258 return true;
1259 }
1260
1261 /* This function is called via elf_m68k_link_hash_traverse if we are
1262 creating a shared object with -Bsymbolic. It discards the space
1263 allocated to copy PC relative relocs against symbols which are defined
1264 in regular objects. We allocated space for them in the check_relocs
1265 routine, but we won't fill them in in the relocate_section routine. */
1266
1267 static boolean
1268 elf_m68k_discard_copies (h, ignore)
1269 struct elf_m68k_link_hash_entry *h;
1270 PTR ignore ATTRIBUTE_UNUSED;
1271 {
1272 struct elf_m68k_pcrel_relocs_copied *s;
1273
1274 if (h->root.root.type == bfd_link_hash_warning)
1275 h = (struct elf_m68k_link_hash_entry *) h->root.root.u.i.link;
1276
1277 /* We only discard relocs for symbols defined in a regular object. */
1278 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1279 return true;
1280
1281 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1282 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1283
1284 return true;
1285 }
1286
1287 /* Relocate an M68K ELF section. */
1288
1289 static boolean
1290 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1291 contents, relocs, local_syms, local_sections)
1292 bfd *output_bfd;
1293 struct bfd_link_info *info;
1294 bfd *input_bfd;
1295 asection *input_section;
1296 bfd_byte *contents;
1297 Elf_Internal_Rela *relocs;
1298 Elf_Internal_Sym *local_syms;
1299 asection **local_sections;
1300 {
1301 bfd *dynobj;
1302 Elf_Internal_Shdr *symtab_hdr;
1303 struct elf_link_hash_entry **sym_hashes;
1304 bfd_vma *local_got_offsets;
1305 asection *sgot;
1306 asection *splt;
1307 asection *sreloc;
1308 Elf_Internal_Rela *rel;
1309 Elf_Internal_Rela *relend;
1310
1311 if (info->relocateable)
1312 return true;
1313
1314 dynobj = elf_hash_table (info)->dynobj;
1315 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1316 sym_hashes = elf_sym_hashes (input_bfd);
1317 local_got_offsets = elf_local_got_offsets (input_bfd);
1318
1319 sgot = NULL;
1320 splt = NULL;
1321 sreloc = NULL;
1322
1323 rel = relocs;
1324 relend = relocs + input_section->reloc_count;
1325 for (; rel < relend; rel++)
1326 {
1327 int r_type;
1328 reloc_howto_type *howto;
1329 unsigned long r_symndx;
1330 struct elf_link_hash_entry *h;
1331 Elf_Internal_Sym *sym;
1332 asection *sec;
1333 bfd_vma relocation;
1334 bfd_reloc_status_type r;
1335
1336 r_type = ELF32_R_TYPE (rel->r_info);
1337 if (r_type < 0 || r_type >= (int) R_68K_max)
1338 {
1339 bfd_set_error (bfd_error_bad_value);
1340 return false;
1341 }
1342 howto = howto_table + r_type;
1343
1344 r_symndx = ELF32_R_SYM (rel->r_info);
1345
1346 h = NULL;
1347 sym = NULL;
1348 sec = NULL;
1349 if (r_symndx < symtab_hdr->sh_info)
1350 {
1351 sym = local_syms + r_symndx;
1352 sec = local_sections[r_symndx];
1353 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
1354 }
1355 else
1356 {
1357 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1358 while (h->root.type == bfd_link_hash_indirect
1359 || h->root.type == bfd_link_hash_warning)
1360 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1361 if (h->root.type == bfd_link_hash_defined
1362 || h->root.type == bfd_link_hash_defweak)
1363 {
1364 sec = h->root.u.def.section;
1365 if (((r_type == R_68K_PLT8
1366 || r_type == R_68K_PLT16
1367 || r_type == R_68K_PLT32
1368 || r_type == R_68K_PLT8O
1369 || r_type == R_68K_PLT16O
1370 || r_type == R_68K_PLT32O)
1371 && h->plt.offset != (bfd_vma) -1
1372 && elf_hash_table (info)->dynamic_sections_created)
1373 || ((r_type == R_68K_GOT8O
1374 || r_type == R_68K_GOT16O
1375 || r_type == R_68K_GOT32O
1376 || ((r_type == R_68K_GOT8
1377 || r_type == R_68K_GOT16
1378 || r_type == R_68K_GOT32)
1379 && strcmp (h->root.root.string,
1380 "_GLOBAL_OFFSET_TABLE_") != 0))
1381 && elf_hash_table (info)->dynamic_sections_created
1382 && (! info->shared
1383 || (! info->symbolic && h->dynindx != -1)
1384 || (h->elf_link_hash_flags
1385 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1386 || (info->shared
1387 && ((! info->symbolic && h->dynindx != -1)
1388 || (h->elf_link_hash_flags
1389 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1390 && ((input_section->flags & SEC_ALLOC) != 0
1391 /* DWARF will emit R_68K_32 relocations in its
1392 sections against symbols defined externally
1393 in shared libraries. We can't do anything
1394 with them here. */
1395 || ((input_section->flags & SEC_DEBUGGING) != 0
1396 && (h->elf_link_hash_flags
1397 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1398 && (r_type == R_68K_8
1399 || r_type == R_68K_16
1400 || r_type == R_68K_32
1401 || r_type == R_68K_PC8
1402 || r_type == R_68K_PC16
1403 || r_type == R_68K_PC32)))
1404 {
1405 /* In these cases, we don't need the relocation
1406 value. We check specially because in some
1407 obscure cases sec->output_section will be NULL. */
1408 relocation = 0;
1409 }
1410 else
1411 relocation = (h->root.u.def.value
1412 + sec->output_section->vma
1413 + sec->output_offset);
1414 }
1415 else if (h->root.type == bfd_link_hash_undefweak)
1416 relocation = 0;
1417 else if (info->shared
1418 && (!info->symbolic || info->allow_shlib_undefined)
1419 && !info->no_undefined
1420 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1421 relocation = 0;
1422 else
1423 {
1424 if (!(info->callbacks->undefined_symbol
1425 (info, h->root.root.string, input_bfd,
1426 input_section, rel->r_offset,
1427 (!info->shared || info->no_undefined
1428 || ELF_ST_VISIBILITY (h->other)))))
1429 return false;
1430 relocation = 0;
1431 }
1432 }
1433
1434 switch (r_type)
1435 {
1436 case R_68K_GOT8:
1437 case R_68K_GOT16:
1438 case R_68K_GOT32:
1439 /* Relocation is to the address of the entry for this symbol
1440 in the global offset table. */
1441 if (h != NULL
1442 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1443 break;
1444 /* Fall through. */
1445 case R_68K_GOT8O:
1446 case R_68K_GOT16O:
1447 case R_68K_GOT32O:
1448 /* Relocation is the offset of the entry for this symbol in
1449 the global offset table. */
1450
1451 {
1452 bfd_vma off;
1453
1454 if (sgot == NULL)
1455 {
1456 sgot = bfd_get_section_by_name (dynobj, ".got");
1457 BFD_ASSERT (sgot != NULL);
1458 }
1459
1460 if (h != NULL)
1461 {
1462 off = h->got.offset;
1463 BFD_ASSERT (off != (bfd_vma) -1);
1464
1465 if (!elf_hash_table (info)->dynamic_sections_created
1466 || (info->shared
1467 && (info->symbolic || h->dynindx == -1)
1468 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1469 {
1470 /* This is actually a static link, or it is a
1471 -Bsymbolic link and the symbol is defined
1472 locally, or the symbol was forced to be local
1473 because of a version file.. We must initialize
1474 this entry in the global offset table. Since
1475 the offset must always be a multiple of 4, we
1476 use the least significant bit to record whether
1477 we have initialized it already.
1478
1479 When doing a dynamic link, we create a .rela.got
1480 relocation entry to initialize the value. This
1481 is done in the finish_dynamic_symbol routine. */
1482 if ((off & 1) != 0)
1483 off &= ~1;
1484 else
1485 {
1486 bfd_put_32 (output_bfd, relocation,
1487 sgot->contents + off);
1488 h->got.offset |= 1;
1489 }
1490 }
1491 }
1492 else
1493 {
1494 BFD_ASSERT (local_got_offsets != NULL
1495 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1496
1497 off = local_got_offsets[r_symndx];
1498
1499 /* The offset must always be a multiple of 4. We use
1500 the least significant bit to record whether we have
1501 already generated the necessary reloc. */
1502 if ((off & 1) != 0)
1503 off &= ~1;
1504 else
1505 {
1506 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1507
1508 if (info->shared)
1509 {
1510 asection *srelgot;
1511 Elf_Internal_Rela outrel;
1512
1513 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1514 BFD_ASSERT (srelgot != NULL);
1515
1516 outrel.r_offset = (sgot->output_section->vma
1517 + sgot->output_offset
1518 + off);
1519 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1520 outrel.r_addend = relocation;
1521 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1522 (((Elf32_External_Rela *)
1523 srelgot->contents)
1524 + srelgot->reloc_count));
1525 ++srelgot->reloc_count;
1526 }
1527
1528 local_got_offsets[r_symndx] |= 1;
1529 }
1530 }
1531
1532 relocation = sgot->output_offset + off;
1533 if (r_type == R_68K_GOT8O
1534 || r_type == R_68K_GOT16O
1535 || r_type == R_68K_GOT32O)
1536 {
1537 /* This relocation does not use the addend. */
1538 rel->r_addend = 0;
1539 }
1540 else
1541 relocation += sgot->output_section->vma;
1542 }
1543 break;
1544
1545 case R_68K_PLT8:
1546 case R_68K_PLT16:
1547 case R_68K_PLT32:
1548 /* Relocation is to the entry for this symbol in the
1549 procedure linkage table. */
1550
1551 /* Resolve a PLTxx reloc against a local symbol directly,
1552 without using the procedure linkage table. */
1553 if (h == NULL)
1554 break;
1555
1556 if (h->plt.offset == (bfd_vma) -1
1557 || !elf_hash_table (info)->dynamic_sections_created)
1558 {
1559 /* We didn't make a PLT entry for this symbol. This
1560 happens when statically linking PIC code, or when
1561 using -Bsymbolic. */
1562 break;
1563 }
1564
1565 if (splt == NULL)
1566 {
1567 splt = bfd_get_section_by_name (dynobj, ".plt");
1568 BFD_ASSERT (splt != NULL);
1569 }
1570
1571 relocation = (splt->output_section->vma
1572 + splt->output_offset
1573 + h->plt.offset);
1574 break;
1575
1576 case R_68K_PLT8O:
1577 case R_68K_PLT16O:
1578 case R_68K_PLT32O:
1579 /* Relocation is the offset of the entry for this symbol in
1580 the procedure linkage table. */
1581 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1582
1583 if (splt == NULL)
1584 {
1585 splt = bfd_get_section_by_name (dynobj, ".plt");
1586 BFD_ASSERT (splt != NULL);
1587 }
1588
1589 relocation = h->plt.offset;
1590
1591 /* This relocation does not use the addend. */
1592 rel->r_addend = 0;
1593
1594 break;
1595
1596 case R_68K_PC8:
1597 case R_68K_PC16:
1598 case R_68K_PC32:
1599 if (h == NULL)
1600 break;
1601 /* Fall through. */
1602 case R_68K_8:
1603 case R_68K_16:
1604 case R_68K_32:
1605 if (info->shared
1606 && r_symndx != 0
1607 && (input_section->flags & SEC_ALLOC) != 0
1608 && ((r_type != R_68K_PC8
1609 && r_type != R_68K_PC16
1610 && r_type != R_68K_PC32)
1611 || (!info->symbolic
1612 || (h->elf_link_hash_flags
1613 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1614 {
1615 Elf_Internal_Rela outrel;
1616 boolean skip, relocate;
1617
1618 /* When generating a shared object, these relocations
1619 are copied into the output file to be resolved at run
1620 time. */
1621
1622 if (sreloc == NULL)
1623 {
1624 const char *name;
1625
1626 name = (bfd_elf_string_from_elf_section
1627 (input_bfd,
1628 elf_elfheader (input_bfd)->e_shstrndx,
1629 elf_section_data (input_section)->rel_hdr.sh_name));
1630 if (name == NULL)
1631 return false;
1632
1633 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1634 && strcmp (bfd_get_section_name (input_bfd,
1635 input_section),
1636 name + 5) == 0);
1637
1638 sreloc = bfd_get_section_by_name (dynobj, name);
1639 BFD_ASSERT (sreloc != NULL);
1640 }
1641
1642 skip = false;
1643 relocate = false;
1644
1645 outrel.r_offset =
1646 _bfd_elf_section_offset (output_bfd, info, input_section,
1647 rel->r_offset);
1648 if (outrel.r_offset == (bfd_vma) -1)
1649 skip = true;
1650 else if (outrel.r_offset == (bfd_vma) -2)
1651 skip = true, relocate = true;
1652 outrel.r_offset += (input_section->output_section->vma
1653 + input_section->output_offset);
1654
1655 if (skip)
1656 memset (&outrel, 0, sizeof outrel);
1657 /* h->dynindx may be -1 if the symbol was marked to
1658 become local. */
1659 else if (h != NULL
1660 && ((! info->symbolic && h->dynindx != -1)
1661 || (h->elf_link_hash_flags
1662 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1663 {
1664 BFD_ASSERT (h->dynindx != -1);
1665 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1666 outrel.r_addend = relocation + rel->r_addend;
1667 }
1668 else
1669 {
1670 if (r_type == R_68K_32)
1671 {
1672 relocate = true;
1673 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1674 outrel.r_addend = relocation + rel->r_addend;
1675 }
1676 else
1677 {
1678 long indx;
1679
1680 if (h == NULL)
1681 sec = local_sections[r_symndx];
1682 else
1683 {
1684 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1685 || (h->root.type
1686 == bfd_link_hash_defweak));
1687 sec = h->root.u.def.section;
1688 }
1689 if (sec != NULL && bfd_is_abs_section (sec))
1690 indx = 0;
1691 else if (sec == NULL || sec->owner == NULL)
1692 {
1693 bfd_set_error (bfd_error_bad_value);
1694 return false;
1695 }
1696 else
1697 {
1698 asection *osec;
1699
1700 osec = sec->output_section;
1701 indx = elf_section_data (osec)->dynindx;
1702 BFD_ASSERT (indx > 0);
1703 }
1704
1705 outrel.r_info = ELF32_R_INFO (indx, r_type);
1706 outrel.r_addend = relocation + rel->r_addend;
1707 }
1708 }
1709
1710 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1711 (((Elf32_External_Rela *)
1712 sreloc->contents)
1713 + sreloc->reloc_count));
1714 ++sreloc->reloc_count;
1715
1716 /* This reloc will be computed at runtime, so there's no
1717 need to do anything now, except for R_68K_32
1718 relocations that have been turned into
1719 R_68K_RELATIVE. */
1720 if (!relocate)
1721 continue;
1722 }
1723
1724 break;
1725
1726 case R_68K_GNU_VTINHERIT:
1727 case R_68K_GNU_VTENTRY:
1728 /* These are no-ops in the end. */
1729 continue;
1730
1731 default:
1732 break;
1733 }
1734
1735 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1736 contents, rel->r_offset,
1737 relocation, rel->r_addend);
1738
1739 if (r != bfd_reloc_ok)
1740 {
1741 switch (r)
1742 {
1743 default:
1744 case bfd_reloc_outofrange:
1745 abort ();
1746 case bfd_reloc_overflow:
1747 {
1748 const char *name;
1749
1750 if (h != NULL)
1751 name = h->root.root.string;
1752 else
1753 {
1754 name = bfd_elf_string_from_elf_section (input_bfd,
1755 symtab_hdr->sh_link,
1756 sym->st_name);
1757 if (name == NULL)
1758 return false;
1759 if (*name == '\0')
1760 name = bfd_section_name (input_bfd, sec);
1761 }
1762 if (!(info->callbacks->reloc_overflow
1763 (info, name, howto->name, (bfd_vma) 0,
1764 input_bfd, input_section, rel->r_offset)))
1765 return false;
1766 }
1767 break;
1768 }
1769 }
1770 }
1771
1772 return true;
1773 }
1774
1775 /* Finish up dynamic symbol handling. We set the contents of various
1776 dynamic sections here. */
1777
1778 static boolean
1779 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1780 bfd *output_bfd;
1781 struct bfd_link_info *info;
1782 struct elf_link_hash_entry *h;
1783 Elf_Internal_Sym *sym;
1784 {
1785 bfd *dynobj;
1786 int plt_off1, plt_off2, plt_off3;
1787
1788 dynobj = elf_hash_table (info)->dynobj;
1789
1790 if (h->plt.offset != (bfd_vma) -1)
1791 {
1792 asection *splt;
1793 asection *sgot;
1794 asection *srela;
1795 bfd_vma plt_index;
1796 bfd_vma got_offset;
1797 Elf_Internal_Rela rela;
1798
1799 /* This symbol has an entry in the procedure linkage table. Set
1800 it up. */
1801
1802 BFD_ASSERT (h->dynindx != -1);
1803
1804 splt = bfd_get_section_by_name (dynobj, ".plt");
1805 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1806 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1807 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1808
1809 /* Get the index in the procedure linkage table which
1810 corresponds to this symbol. This is the index of this symbol
1811 in all the symbols for which we are making plt entries. The
1812 first entry in the procedure linkage table is reserved. */
1813 if ( CPU32_FLAG (output_bfd))
1814 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1815 else
1816 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1817
1818 /* Get the offset into the .got table of the entry that
1819 corresponds to this function. Each .got entry is 4 bytes.
1820 The first three are reserved. */
1821 got_offset = (plt_index + 3) * 4;
1822
1823 if ( CPU32_FLAG (output_bfd))
1824 {
1825 /* Fill in the entry in the procedure linkage table. */
1826 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1827 PLT_CPU32_ENTRY_SIZE);
1828 plt_off1 = 4;
1829 plt_off2 = 12;
1830 plt_off3 = 18;
1831 }
1832 else
1833 {
1834 /* Fill in the entry in the procedure linkage table. */
1835 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1836 PLT_ENTRY_SIZE);
1837 plt_off1 = 4;
1838 plt_off2 = 10;
1839 plt_off3 = 16;
1840 }
1841
1842 /* The offset is relative to the first extension word. */
1843 bfd_put_32 (output_bfd,
1844 (sgot->output_section->vma
1845 + sgot->output_offset
1846 + got_offset
1847 - (splt->output_section->vma
1848 + h->plt.offset + 2)),
1849 splt->contents + h->plt.offset + plt_off1);
1850
1851 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1852 splt->contents + h->plt.offset + plt_off2);
1853 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1854 splt->contents + h->plt.offset + plt_off3);
1855
1856 /* Fill in the entry in the global offset table. */
1857 bfd_put_32 (output_bfd,
1858 (splt->output_section->vma
1859 + splt->output_offset
1860 + h->plt.offset
1861 + 8),
1862 sgot->contents + got_offset);
1863
1864 /* Fill in the entry in the .rela.plt section. */
1865 rela.r_offset = (sgot->output_section->vma
1866 + sgot->output_offset
1867 + got_offset);
1868 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1869 rela.r_addend = 0;
1870 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1871 ((Elf32_External_Rela *) srela->contents
1872 + plt_index));
1873
1874 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1875 {
1876 /* Mark the symbol as undefined, rather than as defined in
1877 the .plt section. Leave the value alone. */
1878 sym->st_shndx = SHN_UNDEF;
1879 }
1880 }
1881
1882 if (h->got.offset != (bfd_vma) -1)
1883 {
1884 asection *sgot;
1885 asection *srela;
1886 Elf_Internal_Rela rela;
1887
1888 /* This symbol has an entry in the global offset table. Set it
1889 up. */
1890
1891 sgot = bfd_get_section_by_name (dynobj, ".got");
1892 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1893 BFD_ASSERT (sgot != NULL && srela != NULL);
1894
1895 rela.r_offset = (sgot->output_section->vma
1896 + sgot->output_offset
1897 + (h->got.offset &~ (bfd_vma) 1));
1898
1899 /* If this is a -Bsymbolic link, and the symbol is defined
1900 locally, we just want to emit a RELATIVE reloc. Likewise if
1901 the symbol was forced to be local because of a version file.
1902 The entry in the global offset table will already have been
1903 initialized in the relocate_section function. */
1904 if (info->shared
1905 && (info->symbolic || h->dynindx == -1)
1906 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1907 {
1908 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1909 rela.r_addend = bfd_get_signed_32 (output_bfd,
1910 (sgot->contents
1911 + (h->got.offset &~ (bfd_vma) 1)));
1912 }
1913 else
1914 {
1915 bfd_put_32 (output_bfd, (bfd_vma) 0,
1916 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1917 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1918 rela.r_addend = 0;
1919 }
1920
1921 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1922 ((Elf32_External_Rela *) srela->contents
1923 + srela->reloc_count));
1924 ++srela->reloc_count;
1925 }
1926
1927 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1928 {
1929 asection *s;
1930 Elf_Internal_Rela rela;
1931
1932 /* This symbol needs a copy reloc. Set it up. */
1933
1934 BFD_ASSERT (h->dynindx != -1
1935 && (h->root.type == bfd_link_hash_defined
1936 || h->root.type == bfd_link_hash_defweak));
1937
1938 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1939 ".rela.bss");
1940 BFD_ASSERT (s != NULL);
1941
1942 rela.r_offset = (h->root.u.def.value
1943 + h->root.u.def.section->output_section->vma
1944 + h->root.u.def.section->output_offset);
1945 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1946 rela.r_addend = 0;
1947 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1948 ((Elf32_External_Rela *) s->contents
1949 + s->reloc_count));
1950 ++s->reloc_count;
1951 }
1952
1953 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1954 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1955 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1956 sym->st_shndx = SHN_ABS;
1957
1958 return true;
1959 }
1960
1961 /* Finish up the dynamic sections. */
1962
1963 static boolean
1964 elf_m68k_finish_dynamic_sections (output_bfd, info)
1965 bfd *output_bfd;
1966 struct bfd_link_info *info;
1967 {
1968 bfd *dynobj;
1969 asection *sgot;
1970 asection *sdyn;
1971
1972 dynobj = elf_hash_table (info)->dynobj;
1973
1974 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1975 BFD_ASSERT (sgot != NULL);
1976 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1977
1978 if (elf_hash_table (info)->dynamic_sections_created)
1979 {
1980 asection *splt;
1981 Elf32_External_Dyn *dyncon, *dynconend;
1982
1983 splt = bfd_get_section_by_name (dynobj, ".plt");
1984 BFD_ASSERT (splt != NULL && sdyn != NULL);
1985
1986 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1987 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1988 for (; dyncon < dynconend; dyncon++)
1989 {
1990 Elf_Internal_Dyn dyn;
1991 const char *name;
1992 asection *s;
1993
1994 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1995
1996 switch (dyn.d_tag)
1997 {
1998 default:
1999 break;
2000
2001 case DT_PLTGOT:
2002 name = ".got";
2003 goto get_vma;
2004 case DT_JMPREL:
2005 name = ".rela.plt";
2006 get_vma:
2007 s = bfd_get_section_by_name (output_bfd, name);
2008 BFD_ASSERT (s != NULL);
2009 dyn.d_un.d_ptr = s->vma;
2010 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2011 break;
2012
2013 case DT_PLTRELSZ:
2014 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2015 BFD_ASSERT (s != NULL);
2016 if (s->_cooked_size != 0)
2017 dyn.d_un.d_val = s->_cooked_size;
2018 else
2019 dyn.d_un.d_val = s->_raw_size;
2020 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2021 break;
2022
2023 case DT_RELASZ:
2024 /* The procedure linkage table relocs (DT_JMPREL) should
2025 not be included in the overall relocs (DT_RELA).
2026 Therefore, we override the DT_RELASZ entry here to
2027 make it not include the JMPREL relocs. Since the
2028 linker script arranges for .rela.plt to follow all
2029 other relocation sections, we don't have to worry
2030 about changing the DT_RELA entry. */
2031 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2032 if (s != NULL)
2033 {
2034 if (s->_cooked_size != 0)
2035 dyn.d_un.d_val -= s->_cooked_size;
2036 else
2037 dyn.d_un.d_val -= s->_raw_size;
2038 }
2039 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2040 break;
2041 }
2042 }
2043
2044 /* Fill in the first entry in the procedure linkage table. */
2045 if (splt->_raw_size > 0)
2046 {
2047 if (!CPU32_FLAG (output_bfd))
2048 {
2049 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2050 bfd_put_32 (output_bfd,
2051 (sgot->output_section->vma
2052 + sgot->output_offset + 4
2053 - (splt->output_section->vma + 2)),
2054 splt->contents + 4);
2055 bfd_put_32 (output_bfd,
2056 (sgot->output_section->vma
2057 + sgot->output_offset + 8
2058 - (splt->output_section->vma + 10)),
2059 splt->contents + 12);
2060 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2061 = PLT_ENTRY_SIZE;
2062 }
2063 else /* cpu32 */
2064 {
2065 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2066 bfd_put_32 (output_bfd,
2067 (sgot->output_section->vma
2068 + sgot->output_offset + 4
2069 - (splt->output_section->vma + 2)),
2070 splt->contents + 4);
2071 bfd_put_32 (output_bfd,
2072 (sgot->output_section->vma
2073 + sgot->output_offset + 8
2074 - (splt->output_section->vma + 10)),
2075 splt->contents + 12);
2076 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2077 = PLT_CPU32_ENTRY_SIZE;
2078 }
2079 }
2080 }
2081
2082 /* Fill in the first three entries in the global offset table. */
2083 if (sgot->_raw_size > 0)
2084 {
2085 if (sdyn == NULL)
2086 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2087 else
2088 bfd_put_32 (output_bfd,
2089 sdyn->output_section->vma + sdyn->output_offset,
2090 sgot->contents);
2091 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2092 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2093 }
2094
2095 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2096
2097 return true;
2098 }
2099
2100 /* Given a .data section and a .emreloc in-memory section, store
2101 relocation information into the .emreloc section which can be
2102 used at runtime to relocate the section. This is called by the
2103 linker when the --embedded-relocs switch is used. This is called
2104 after the add_symbols entry point has been called for all the
2105 objects, and before the final_link entry point is called. */
2106
2107 boolean
2108 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2109 bfd *abfd;
2110 struct bfd_link_info *info;
2111 asection *datasec;
2112 asection *relsec;
2113 char **errmsg;
2114 {
2115 Elf_Internal_Shdr *symtab_hdr;
2116 Elf_Internal_Shdr *shndx_hdr;
2117 Elf32_External_Sym *extsyms;
2118 Elf32_External_Sym *free_extsyms = NULL;
2119 Elf_External_Sym_Shndx *shndx_buf = NULL;
2120 Elf_Internal_Rela *internal_relocs;
2121 Elf_Internal_Rela *free_relocs = NULL;
2122 Elf_Internal_Rela *irel, *irelend;
2123 bfd_byte *p;
2124 bfd_size_type amt;
2125
2126 BFD_ASSERT (! info->relocateable);
2127
2128 *errmsg = NULL;
2129
2130 if (datasec->reloc_count == 0)
2131 return true;
2132
2133 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2134 /* Read this BFD's symbols if we haven't done so already, or get the cached
2135 copy if it exists. */
2136 if (symtab_hdr->contents != NULL)
2137 extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
2138 else
2139 {
2140 /* Go get them off disk. */
2141 amt = symtab_hdr->sh_info * sizeof (Elf32_External_Sym);
2142 if (info->keep_memory)
2143 extsyms = (Elf32_External_Sym *) bfd_alloc (abfd, amt);
2144 else
2145 extsyms = (Elf32_External_Sym *) bfd_malloc (amt);
2146 if (extsyms == NULL)
2147 goto error_return;
2148 if (! info->keep_memory)
2149 free_extsyms = extsyms;
2150 if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
2151 || bfd_bread (extsyms, amt, abfd) != amt)
2152 goto error_return;
2153 if (info->keep_memory)
2154 symtab_hdr->contents = (unsigned char *) extsyms;
2155 }
2156
2157 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
2158 if (shndx_hdr->sh_size != 0)
2159 {
2160 amt = symtab_hdr->sh_info * sizeof (Elf_External_Sym_Shndx);
2161 shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
2162 if (shndx_buf == NULL)
2163 goto error_return;
2164 if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0
2165 || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
2166 goto error_return;
2167 }
2168
2169 /* Get a copy of the native relocations. */
2170 internal_relocs = (_bfd_elf32_link_read_relocs
2171 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2172 info->keep_memory));
2173 if (internal_relocs == NULL)
2174 goto error_return;
2175 if (! info->keep_memory)
2176 free_relocs = internal_relocs;
2177
2178 amt = (bfd_size_type) datasec->reloc_count * 12;
2179 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2180 if (relsec->contents == NULL)
2181 goto error_return;
2182
2183 p = relsec->contents;
2184
2185 irelend = internal_relocs + datasec->reloc_count;
2186 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2187 {
2188 asection *targetsec;
2189
2190 /* We are going to write a four byte longword into the runtime
2191 reloc section. The longword will be the address in the data
2192 section which must be relocated. It is followed by the name
2193 of the target section NUL-padded or truncated to 8
2194 characters. */
2195
2196 /* We can only relocate absolute longword relocs at run time. */
2197 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2198 {
2199 *errmsg = _("unsupported reloc type");
2200 bfd_set_error (bfd_error_bad_value);
2201 goto error_return;
2202 }
2203
2204 /* Get the target section referred to by the reloc. */
2205 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2206 {
2207 Elf32_External_Sym *esym;
2208 Elf_External_Sym_Shndx *shndx;
2209 Elf_Internal_Sym isym;
2210
2211 /* A local symbol. */
2212 esym = extsyms + ELF32_R_SYM (irel->r_info);
2213 shndx = shndx_buf + (shndx_buf ? ELF32_R_SYM (irel->r_info) : 0);
2214 bfd_elf32_swap_symbol_in (abfd, (const PTR) esym, (const PTR) shndx,
2215 &isym);
2216
2217 targetsec = bfd_section_from_elf_index (abfd, isym.st_shndx);
2218 }
2219 else
2220 {
2221 unsigned long indx;
2222 struct elf_link_hash_entry *h;
2223
2224 /* An external symbol. */
2225 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2226 h = elf_sym_hashes (abfd)[indx];
2227 BFD_ASSERT (h != NULL);
2228 if (h->root.type == bfd_link_hash_defined
2229 || h->root.type == bfd_link_hash_defweak)
2230 targetsec = h->root.u.def.section;
2231 else
2232 targetsec = NULL;
2233 }
2234
2235 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2236 memset (p + 4, 0, 8);
2237 if (targetsec != NULL)
2238 strncpy (p + 4, targetsec->output_section->name, 8);
2239 }
2240
2241 if (shndx_buf != NULL)
2242 free (shndx_buf);
2243 if (free_extsyms != NULL)
2244 free (free_extsyms);
2245 if (free_relocs != NULL)
2246 free (free_relocs);
2247 return true;
2248
2249 error_return:
2250 if (shndx_buf != NULL)
2251 free (shndx_buf);
2252 if (free_extsyms != NULL)
2253 free (free_extsyms);
2254 if (free_relocs != NULL)
2255 free (free_relocs);
2256 return false;
2257 }
2258
2259 static enum elf_reloc_type_class
2260 elf32_m68k_reloc_type_class (rela)
2261 const Elf_Internal_Rela *rela;
2262 {
2263 switch ((int) ELF32_R_TYPE (rela->r_info))
2264 {
2265 case R_68K_RELATIVE:
2266 return reloc_class_relative;
2267 case R_68K_JMP_SLOT:
2268 return reloc_class_plt;
2269 case R_68K_COPY:
2270 return reloc_class_copy;
2271 default:
2272 return reloc_class_normal;
2273 }
2274 }
2275
2276 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2277 #define TARGET_BIG_NAME "elf32-m68k"
2278 #define ELF_MACHINE_CODE EM_68K
2279 #define ELF_MAXPAGESIZE 0x2000
2280 #define elf_backend_create_dynamic_sections \
2281 _bfd_elf_create_dynamic_sections
2282 #define bfd_elf32_bfd_link_hash_table_create \
2283 elf_m68k_link_hash_table_create
2284 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2285
2286 #define elf_backend_check_relocs elf_m68k_check_relocs
2287 #define elf_backend_adjust_dynamic_symbol \
2288 elf_m68k_adjust_dynamic_symbol
2289 #define elf_backend_size_dynamic_sections \
2290 elf_m68k_size_dynamic_sections
2291 #define elf_backend_relocate_section elf_m68k_relocate_section
2292 #define elf_backend_finish_dynamic_symbol \
2293 elf_m68k_finish_dynamic_symbol
2294 #define elf_backend_finish_dynamic_sections \
2295 elf_m68k_finish_dynamic_sections
2296 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2297 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2298 #define bfd_elf32_bfd_merge_private_bfd_data \
2299 elf32_m68k_merge_private_bfd_data
2300 #define bfd_elf32_bfd_set_private_flags \
2301 elf32_m68k_set_private_flags
2302 #define bfd_elf32_bfd_print_private_bfd_data \
2303 elf32_m68k_print_private_bfd_data
2304 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2305
2306 #define elf_backend_can_gc_sections 1
2307 #define elf_backend_can_refcount 1
2308 #define elf_backend_want_got_plt 1
2309 #define elf_backend_plt_readonly 1
2310 #define elf_backend_want_plt_sym 0
2311 #define elf_backend_got_header_size 12
2312 #define elf_backend_rela_normal 1
2313
2314 #include "elf32-target.h"
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