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2000-12-06 Kazu Hirata <kazu@hxi.com>
[binutils.git] / bfd / elf32-m68k.c
blob07cd06124fdf67ba2602b5a9a9fcaeabfddbe53a
1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 95, 96, 97, 98, 1999 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19
20 #include "bfd.h"
21 #include "sysdep.h"
22 #include "bfdlink.h"
23 #include "libbfd.h"
24 #include "elf-bfd.h"
25 #include "elf/m68k.h"
26
27 static reloc_howto_type *reloc_type_lookup
28 PARAMS ((bfd *, bfd_reloc_code_real_type));
29 static void rtype_to_howto
30 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
31 static struct bfd_hash_entry *elf_m68k_link_hash_newfunc
32 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
33 static struct bfd_link_hash_table *elf_m68k_link_hash_table_create
34 PARAMS ((bfd *));
35 static boolean elf_m68k_check_relocs
36 PARAMS ((bfd *, struct bfd_link_info *, asection *,
37 const Elf_Internal_Rela *));
38 static asection *elf_m68k_gc_mark_hook
39 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
40 struct elf_link_hash_entry *, Elf_Internal_Sym *));
41 static boolean elf_m68k_gc_sweep_hook
42 PARAMS ((bfd *, struct bfd_link_info *, asection *,
43 const Elf_Internal_Rela *));
44 static boolean elf_m68k_adjust_dynamic_symbol
45 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
46 static boolean elf_m68k_size_dynamic_sections
47 PARAMS ((bfd *, struct bfd_link_info *));
48 static boolean elf_m68k_relocate_section
49 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
50 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
51 static boolean elf_m68k_finish_dynamic_symbol
52 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
53 Elf_Internal_Sym *));
54 static boolean elf_m68k_finish_dynamic_sections
55 PARAMS ((bfd *, struct bfd_link_info *));
56
57 static boolean elf32_m68k_set_private_flags
58 PARAMS ((bfd *, flagword));
59 static boolean elf32_m68k_copy_private_bfd_data
60 PARAMS ((bfd *, bfd *));
61 static boolean elf32_m68k_merge_private_bfd_data
62 PARAMS ((bfd *, bfd *));
63 static boolean elf32_m68k_print_private_bfd_data
64 PARAMS ((bfd *, PTR));
65
66 static reloc_howto_type howto_table[] = {
67 HOWTO(R_68K_NONE, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", false, 0, 0x00000000,false),
68 HOWTO(R_68K_32, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0, 0xffffffff,false),
69 HOWTO(R_68K_16, 0, 1,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0, 0x0000ffff,false),
70 HOWTO(R_68K_8, 0, 0, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0, 0x000000ff,false),
71 HOWTO(R_68K_PC32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", false, 0, 0xffffffff,true),
72 HOWTO(R_68K_PC16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0, 0x0000ffff,true),
73 HOWTO(R_68K_PC8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0, 0x000000ff,true),
74 HOWTO(R_68K_GOT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0, 0xffffffff,true),
75 HOWTO(R_68K_GOT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0, 0x0000ffff,true),
76 HOWTO(R_68K_GOT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0, 0x000000ff,true),
77 HOWTO(R_68K_GOT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0, 0xffffffff,false),
78 HOWTO(R_68K_GOT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0, 0x0000ffff,false),
79 HOWTO(R_68K_GOT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0, 0x000000ff,false),
80 HOWTO(R_68K_PLT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0, 0xffffffff,true),
81 HOWTO(R_68K_PLT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0, 0x0000ffff,true),
82 HOWTO(R_68K_PLT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0, 0x000000ff,true),
83 HOWTO(R_68K_PLT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0, 0xffffffff,false),
84 HOWTO(R_68K_PLT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0, 0x0000ffff,false),
85 HOWTO(R_68K_PLT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", false, 0, 0x000000ff,false),
86 HOWTO(R_68K_COPY, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", false, 0, 0xffffffff,false),
87 HOWTO(R_68K_GLOB_DAT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", false, 0, 0xffffffff,false),
88 HOWTO(R_68K_JMP_SLOT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", false, 0, 0xffffffff,false),
89 HOWTO(R_68K_RELATIVE, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", false, 0, 0xffffffff,false),
90 /* GNU extension to record C++ vtable hierarchy */
91 HOWTO (R_68K_GNU_VTINHERIT, /* type */
92 0, /* rightshift */
93 2, /* size (0 = byte, 1 = short, 2 = long) */
94 0, /* bitsize */
95 false, /* pc_relative */
96 0, /* bitpos */
97 complain_overflow_dont, /* complain_on_overflow */
98 NULL, /* special_function */
99 "R_68K_GNU_VTINHERIT", /* name */
100 false, /* partial_inplace */
101 0, /* src_mask */
102 0, /* dst_mask */
103 false),
104 /* GNU extension to record C++ vtable member usage */
105 HOWTO (R_68K_GNU_VTENTRY, /* type */
106 0, /* rightshift */
107 2, /* size (0 = byte, 1 = short, 2 = long) */
108 0, /* bitsize */
109 false, /* pc_relative */
110 0, /* bitpos */
111 complain_overflow_dont, /* complain_on_overflow */
112 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
113 "R_68K_GNU_VTENTRY", /* name */
114 false, /* partial_inplace */
115 0, /* src_mask */
116 0, /* dst_mask */
117 false),
118 };
119
120 static void
121 rtype_to_howto (abfd, cache_ptr, dst)
122 bfd *abfd ATTRIBUTE_UNUSED;
123 arelent *cache_ptr;
124 Elf_Internal_Rela *dst;
125 {
126 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max);
127 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
128 }
129
130 #define elf_info_to_howto rtype_to_howto
131
132 static const struct
133 {
134 bfd_reloc_code_real_type bfd_val;
135 int elf_val;
136 } reloc_map[] = {
137 { BFD_RELOC_NONE, R_68K_NONE },
138 { BFD_RELOC_32, R_68K_32 },
139 { BFD_RELOC_16, R_68K_16 },
140 { BFD_RELOC_8, R_68K_8 },
141 { BFD_RELOC_32_PCREL, R_68K_PC32 },
142 { BFD_RELOC_16_PCREL, R_68K_PC16 },
143 { BFD_RELOC_8_PCREL, R_68K_PC8 },
144 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 },
145 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 },
146 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 },
147 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O },
148 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O },
149 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O },
150 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 },
151 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 },
152 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 },
153 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O },
154 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O },
155 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O },
156 { BFD_RELOC_NONE, R_68K_COPY },
157 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT },
158 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT },
159 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE },
160 { BFD_RELOC_CTOR, R_68K_32 },
161 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT },
162 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY },
163 };
164
165 static reloc_howto_type *
166 reloc_type_lookup (abfd, code)
167 bfd *abfd ATTRIBUTE_UNUSED;
168 bfd_reloc_code_real_type code;
169 {
170 unsigned int i;
171 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
172 {
173 if (reloc_map[i].bfd_val == code)
174 return &howto_table[reloc_map[i].elf_val];
175 }
176 return 0;
177 }
178
179 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
180 #define ELF_ARCH bfd_arch_m68k
181 /* end code generated by elf.el */
182
183 #define USE_RELA
184
185 \f
186 /* Functions for the m68k ELF linker. */
187
188 /* The name of the dynamic interpreter. This is put in the .interp
189 section. */
190
191 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
192
193 /* The size in bytes of an entry in the procedure linkage table. */
194
195 #define PLT_ENTRY_SIZE 20
196
197 /* The first entry in a procedure linkage table looks like this. See
198 the SVR4 ABI m68k supplement to see how this works. */
199
200 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
201 {
202 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
203 0, 0, 0, 0, /* replaced with offset to .got + 4. */
204 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
205 0, 0, 0, 0, /* replaced with offset to .got + 8. */
206 0, 0, 0, 0 /* pad out to 20 bytes. */
207 };
208
209 /* Subsequent entries in a procedure linkage table look like this. */
210
211 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
212 {
213 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
214 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
215 0x2f, 0x3c, /* move.l #offset,-(%sp) */
216 0, 0, 0, 0, /* replaced with offset into relocation table. */
217 0x60, 0xff, /* bra.l .plt */
218 0, 0, 0, 0 /* replaced with offset to start of .plt. */
219 };
220
221 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
222
223 #define PLT_CPU32_ENTRY_SIZE 24
224 /* Procedure linkage table entries for the cpu32 */
225 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
226 {
227 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
228 0, 0, 0, 0, /* replaced with offset to .got + 4. */
229 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
230 0, 0, 0, 0, /* replace with offset to .got +8. */
231 0x4e, 0xd1, /* jmp %a1@ */
232 0, 0, 0, 0, /* pad out to 24 bytes. */
233 0, 0
234 };
235
236 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
237 {
238 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
239 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
240 0x4e, 0xd1, /* jmp %a1@ */
241 0x2f, 0x3c, /* move.l #offset,-(%sp) */
242 0, 0, 0, 0, /* replaced with offset into relocation table. */
243 0x60, 0xff, /* bra.l .plt */
244 0, 0, 0, 0, /* replaced with offset to start of .plt. */
245 0, 0
246 };
247
248 /* The m68k linker needs to keep track of the number of relocs that it
249 decides to copy in check_relocs for each symbol. This is so that it
250 can discard PC relative relocs if it doesn't need them when linking
251 with -Bsymbolic. We store the information in a field extending the
252 regular ELF linker hash table. */
253
254 /* This structure keeps track of the number of PC relative relocs we have
255 copied for a given symbol. */
256
257 struct elf_m68k_pcrel_relocs_copied
258 {
259 /* Next section. */
260 struct elf_m68k_pcrel_relocs_copied *next;
261 /* A section in dynobj. */
262 asection *section;
263 /* Number of relocs copied in this section. */
264 bfd_size_type count;
265 };
266
267 /* m68k ELF linker hash entry. */
268
269 struct elf_m68k_link_hash_entry
270 {
271 struct elf_link_hash_entry root;
272
273 /* Number of PC relative relocs copied for this symbol. */
274 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
275 };
276
277 /* m68k ELF linker hash table. */
278
279 struct elf_m68k_link_hash_table
280 {
281 struct elf_link_hash_table root;
282 };
283
284 /* Declare this now that the above structures are defined. */
285
286 static boolean elf_m68k_discard_copies
287 PARAMS ((struct elf_m68k_link_hash_entry *, PTR));
288
289 /* Traverse an m68k ELF linker hash table. */
290
291 #define elf_m68k_link_hash_traverse(table, func, info) \
292 (elf_link_hash_traverse \
293 (&(table)->root, \
294 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
295 (info)))
296
297 /* Get the m68k ELF linker hash table from a link_info structure. */
298
299 #define elf_m68k_hash_table(p) \
300 ((struct elf_m68k_link_hash_table *) (p)->hash)
301
302 /* Create an entry in an m68k ELF linker hash table. */
303
304 static struct bfd_hash_entry *
305 elf_m68k_link_hash_newfunc (entry, table, string)
306 struct bfd_hash_entry *entry;
307 struct bfd_hash_table *table;
308 const char *string;
309 {
310 struct elf_m68k_link_hash_entry *ret =
311 (struct elf_m68k_link_hash_entry *) entry;
312
313 /* Allocate the structure if it has not already been allocated by a
314 subclass. */
315 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
316 ret = ((struct elf_m68k_link_hash_entry *)
317 bfd_hash_allocate (table,
318 sizeof (struct elf_m68k_link_hash_entry)));
319 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
320 return (struct bfd_hash_entry *) ret;
321
322 /* Call the allocation method of the superclass. */
323 ret = ((struct elf_m68k_link_hash_entry *)
324 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
325 table, string));
326 if (ret != (struct elf_m68k_link_hash_entry *) NULL)
327 {
328 ret->pcrel_relocs_copied = NULL;
329 }
330
331 return (struct bfd_hash_entry *) ret;
332 }
333
334 /* Create an m68k ELF linker hash table. */
335
336 static struct bfd_link_hash_table *
337 elf_m68k_link_hash_table_create (abfd)
338 bfd *abfd;
339 {
340 struct elf_m68k_link_hash_table *ret;
341
342 ret = ((struct elf_m68k_link_hash_table *)
343 bfd_alloc (abfd, sizeof (struct elf_m68k_link_hash_table)));
344 if (ret == (struct elf_m68k_link_hash_table *) NULL)
345 return NULL;
346
347 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
348 elf_m68k_link_hash_newfunc))
349 {
350 bfd_release (abfd, ret);
351 return NULL;
352 }
353
354 return &ret->root.root;
355 }
356
357 /* Keep m68k-specific flags in the ELF header */
358 static boolean
359 elf32_m68k_set_private_flags (abfd, flags)
360 bfd *abfd;
361 flagword flags;
362 {
363 elf_elfheader (abfd)->e_flags = flags;
364 elf_flags_init (abfd) = true;
365 return true;
366 }
367
368 /* Copy m68k-specific data from one module to another */
369 static boolean
370 elf32_m68k_copy_private_bfd_data (ibfd, obfd)
371 bfd *ibfd;
372 bfd *obfd;
373 {
374 flagword in_flags;
375
376 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
377 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
378 return true;
379
380 in_flags = elf_elfheader (ibfd)->e_flags;
381
382 elf_elfheader (obfd)->e_flags = in_flags;
383 elf_flags_init (obfd) = true;
384
385 return true;
386 }
387
388 /* Merge backend specific data from an object file to the output
389 object file when linking. */
390 static boolean
391 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
392 bfd *ibfd;
393 bfd *obfd;
394 {
395 flagword out_flags;
396 flagword in_flags;
397
398 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
399 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
400 return true;
401
402 in_flags = elf_elfheader (ibfd)->e_flags;
403 out_flags = elf_elfheader (obfd)->e_flags;
404
405 if (!elf_flags_init (obfd))
406 {
407 elf_flags_init (obfd) = true;
408 elf_elfheader (obfd)->e_flags = in_flags;
409 }
410
411 return true;
412 }
413
414 /* Display the flags field */
415 static boolean
416 elf32_m68k_print_private_bfd_data (abfd, ptr)
417 bfd *abfd;
418 PTR ptr;
419 {
420 FILE *file = (FILE *) ptr;
421
422 BFD_ASSERT (abfd != NULL && ptr != NULL);
423
424 /* Print normal ELF private data. */
425 _bfd_elf_print_private_bfd_data (abfd, ptr);
426
427 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
428
429 /* xgettext:c-format */
430 fprintf (file, _ ("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
431
432 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
433 fprintf (file, _ (" [cpu32]"));
434
435 fputc ('\n', file);
436
437 return true;
438 }
439 /* Look through the relocs for a section during the first phase, and
440 allocate space in the global offset table or procedure linkage
441 table. */
442
443 static boolean
444 elf_m68k_check_relocs (abfd, info, sec, relocs)
445 bfd *abfd;
446 struct bfd_link_info *info;
447 asection *sec;
448 const Elf_Internal_Rela *relocs;
449 {
450 bfd *dynobj;
451 Elf_Internal_Shdr *symtab_hdr;
452 struct elf_link_hash_entry **sym_hashes;
453 bfd_signed_vma *local_got_refcounts;
454 const Elf_Internal_Rela *rel;
455 const Elf_Internal_Rela *rel_end;
456 asection *sgot;
457 asection *srelgot;
458 asection *sreloc;
459
460 if (info->relocateable)
461 return true;
462
463 dynobj = elf_hash_table (info)->dynobj;
464 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
465 sym_hashes = elf_sym_hashes (abfd);
466 local_got_refcounts = elf_local_got_refcounts (abfd);
467
468 sgot = NULL;
469 srelgot = NULL;
470 sreloc = NULL;
471
472 rel_end = relocs + sec->reloc_count;
473 for (rel = relocs; rel < rel_end; rel++)
474 {
475 unsigned long r_symndx;
476 struct elf_link_hash_entry *h;
477
478 r_symndx = ELF32_R_SYM (rel->r_info);
479
480 if (r_symndx < symtab_hdr->sh_info)
481 h = NULL;
482 else
483 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
484
485 switch (ELF32_R_TYPE (rel->r_info))
486 {
487 case R_68K_GOT8:
488 case R_68K_GOT16:
489 case R_68K_GOT32:
490 if (h != NULL
491 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
492 break;
493 /* Fall through. */
494 case R_68K_GOT8O:
495 case R_68K_GOT16O:
496 case R_68K_GOT32O:
497 /* This symbol requires a global offset table entry. */
498
499 if (dynobj == NULL)
500 {
501 /* Create the .got section. */
502 elf_hash_table (info)->dynobj = dynobj = abfd;
503 if (!_bfd_elf_create_got_section (dynobj, info))
504 return false;
505 }
506
507 if (sgot == NULL)
508 {
509 sgot = bfd_get_section_by_name (dynobj, ".got");
510 BFD_ASSERT (sgot != NULL);
511 }
512
513 if (srelgot == NULL
514 && (h != NULL || info->shared))
515 {
516 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
517 if (srelgot == NULL)
518 {
519 srelgot = bfd_make_section (dynobj, ".rela.got");
520 if (srelgot == NULL
521 || !bfd_set_section_flags (dynobj, srelgot,
522 (SEC_ALLOC
523 | SEC_LOAD
524 | SEC_HAS_CONTENTS
525 | SEC_IN_MEMORY
526 | SEC_LINKER_CREATED
527 | SEC_READONLY))
528 || !bfd_set_section_alignment (dynobj, srelgot, 2))
529 return false;
530 }
531 }
532
533 if (h != NULL)
534 {
535 if (h->got.refcount == -1)
536 {
537 h->got.refcount = 1;
538
539 /* Make sure this symbol is output as a dynamic symbol. */
540 if (h->dynindx == -1)
541 {
542 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
543 return false;
544 }
545
546 /* Allocate space in the .got section. */
547 sgot->_raw_size += 4;
548 /* Allocate relocation space. */
549 srelgot->_raw_size += sizeof (Elf32_External_Rela);
550 }
551 else
552 h->got.refcount++;
553 }
554 else
555 {
556 /* This is a global offset table entry for a local symbol. */
557 if (local_got_refcounts == NULL)
558 {
559 size_t size;
560
561 size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
562 local_got_refcounts = ((bfd_signed_vma *)
563 bfd_alloc (abfd, size));
564 if (local_got_refcounts == NULL)
565 return false;
566 elf_local_got_refcounts (abfd) = local_got_refcounts;
567 memset (local_got_refcounts, -1, size);
568 }
569 if (local_got_refcounts[r_symndx] == -1)
570 {
571 local_got_refcounts[r_symndx] = 1;
572
573 sgot->_raw_size += 4;
574 if (info->shared)
575 {
576 /* If we are generating a shared object, we need to
577 output a R_68K_RELATIVE reloc so that the dynamic
578 linker can adjust this GOT entry. */
579 srelgot->_raw_size += sizeof (Elf32_External_Rela);
580 }
581 }
582 else
583 local_got_refcounts[r_symndx]++;
584 }
585 break;
586
587 case R_68K_PLT8:
588 case R_68K_PLT16:
589 case R_68K_PLT32:
590 /* This symbol requires a procedure linkage table entry. We
591 actually build the entry in adjust_dynamic_symbol,
592 because this might be a case of linking PIC code which is
593 never referenced by a dynamic object, in which case we
594 don't need to generate a procedure linkage table entry
595 after all. */
596
597 /* If this is a local symbol, we resolve it directly without
598 creating a procedure linkage table entry. */
599 if (h == NULL)
600 continue;
601
602 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
603 if (h->plt.refcount == -1)
604 h->plt.refcount = 1;
605 else
606 h->plt.refcount++;
607 break;
608
609 case R_68K_PLT8O:
610 case R_68K_PLT16O:
611 case R_68K_PLT32O:
612 /* This symbol requires a procedure linkage table entry. */
613
614 if (h == NULL)
615 {
616 /* It does not make sense to have this relocation for a
617 local symbol. FIXME: does it? How to handle it if
618 it does make sense? */
619 bfd_set_error (bfd_error_bad_value);
620 return false;
621 }
622
623 /* Make sure this symbol is output as a dynamic symbol. */
624 if (h->dynindx == -1)
625 {
626 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
627 return false;
628 }
629
630 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
631 if (h->plt.refcount == -1)
632 h->plt.refcount = 1;
633 else
634 h->plt.refcount++;
635 break;
636
637 case R_68K_PC8:
638 case R_68K_PC16:
639 case R_68K_PC32:
640 /* If we are creating a shared library and this is not a local
641 symbol, we need to copy the reloc into the shared library.
642 However when linking with -Bsymbolic and this is a global
643 symbol which is defined in an object we are including in the
644 link (i.e., DEF_REGULAR is set), then we can resolve the
645 reloc directly. At this point we have not seen all the input
646 files, so it is possible that DEF_REGULAR is not set now but
647 will be set later (it is never cleared). We account for that
648 possibility below by storing information in the
649 pcrel_relocs_copied field of the hash table entry. */
650 if (!(info->shared
651 && (sec->flags & SEC_ALLOC) != 0
652 && h != NULL
653 && (!info->symbolic
654 || (h->elf_link_hash_flags
655 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
656 {
657 if (h != NULL)
658 {
659 /* Make sure a plt entry is created for this symbol if
660 it turns out to be a function defined by a dynamic
661 object. */
662 if (h->plt.refcount == -1)
663 h->plt.refcount = 1;
664 else
665 h->plt.refcount++;
666 }
667 break;
668 }
669 /* Fall through. */
670 case R_68K_8:
671 case R_68K_16:
672 case R_68K_32:
673 if (h != NULL)
674 {
675 /* Make sure a plt entry is created for this symbol if it
676 turns out to be a function defined by a dynamic object. */
677 if (h->plt.refcount == -1)
678 h->plt.refcount = 1;
679 else
680 h->plt.refcount++;
681 }
682
683 /* If we are creating a shared library, we need to copy the
684 reloc into the shared library. */
685 if (info->shared
686 && (sec->flags & SEC_ALLOC) != 0)
687 {
688 /* When creating a shared object, we must copy these
689 reloc types into the output file. We create a reloc
690 section in dynobj and make room for this reloc. */
691 if (sreloc == NULL)
692 {
693 const char *name;
694
695 name = (bfd_elf_string_from_elf_section
696 (abfd,
697 elf_elfheader (abfd)->e_shstrndx,
698 elf_section_data (sec)->rel_hdr.sh_name));
699 if (name == NULL)
700 return false;
701
702 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
703 && strcmp (bfd_get_section_name (abfd, sec),
704 name + 5) == 0);
705
706 sreloc = bfd_get_section_by_name (dynobj, name);
707 if (sreloc == NULL)
708 {
709 sreloc = bfd_make_section (dynobj, name);
710 if (sreloc == NULL
711 || !bfd_set_section_flags (dynobj, sreloc,
712 (SEC_ALLOC
713 | SEC_LOAD
714 | SEC_HAS_CONTENTS
715 | SEC_IN_MEMORY
716 | SEC_LINKER_CREATED
717 | SEC_READONLY))
718 || !bfd_set_section_alignment (dynobj, sreloc, 2))
719 return false;
720 }
721 }
722
723 sreloc->_raw_size += sizeof (Elf32_External_Rela);
724
725 /* If we are linking with -Bsymbolic, we count the number of
726 PC relative relocations we have entered for this symbol,
727 so that we can discard them again if the symbol is later
728 defined by a regular object. Note that this function is
729 only called if we are using an m68kelf linker hash table,
730 which means that h is really a pointer to an
731 elf_m68k_link_hash_entry. */
732 if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8
733 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
734 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
735 && info->symbolic)
736 {
737 struct elf_m68k_link_hash_entry *eh;
738 struct elf_m68k_pcrel_relocs_copied *p;
739
740 eh = (struct elf_m68k_link_hash_entry *) h;
741
742 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
743 if (p->section == sreloc)
744 break;
745
746 if (p == NULL)
747 {
748 p = ((struct elf_m68k_pcrel_relocs_copied *)
749 bfd_alloc (dynobj, sizeof *p));
750 if (p == NULL)
751 return false;
752 p->next = eh->pcrel_relocs_copied;
753 eh->pcrel_relocs_copied = p;
754 p->section = sreloc;
755 p->count = 0;
756 }
757
758 ++p->count;
759 }
760 }
761
762 break;
763
764 /* This relocation describes the C++ object vtable hierarchy.
765 Reconstruct it for later use during GC. */
766 case R_68K_GNU_VTINHERIT:
767 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
768 return false;
769 break;
770
771 /* This relocation describes which C++ vtable entries are actually
772 used. Record for later use during GC. */
773 case R_68K_GNU_VTENTRY:
774 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
775 return false;
776 break;
777
778 default:
779 break;
780 }
781 }
782
783 return true;
784 }
785
786 /* Return the section that should be marked against GC for a given
787 relocation. */
788
789 static asection *
790 elf_m68k_gc_mark_hook (abfd, info, rel, h, sym)
791 bfd *abfd;
792 struct bfd_link_info *info ATTRIBUTE_UNUSED;
793 Elf_Internal_Rela *rel;
794 struct elf_link_hash_entry *h;
795 Elf_Internal_Sym *sym;
796 {
797 if (h != NULL)
798 {
799 switch (ELF32_R_TYPE (rel->r_info))
800 {
801 case R_68K_GNU_VTINHERIT:
802 case R_68K_GNU_VTENTRY:
803 break;
804
805 default:
806 switch (h->root.type)
807 {
808 default:
809 break;
810
811 case bfd_link_hash_defined:
812 case bfd_link_hash_defweak:
813 return h->root.u.def.section;
814
815 case bfd_link_hash_common:
816 return h->root.u.c.p->section;
817 }
818 }
819 }
820 else
821 {
822 if (!(elf_bad_symtab (abfd)
823 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
824 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
825 && sym->st_shndx != SHN_COMMON))
826 {
827 return bfd_section_from_elf_index (abfd, sym->st_shndx);
828 }
829 }
830
831 return NULL;
832 }
833
834 /* Update the got entry reference counts for the section being removed. */
835
836 static boolean
837 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
838 bfd *abfd;
839 struct bfd_link_info *info;
840 asection *sec;
841 const Elf_Internal_Rela *relocs;
842 {
843 Elf_Internal_Shdr *symtab_hdr;
844 struct elf_link_hash_entry **sym_hashes;
845 bfd_signed_vma *local_got_refcounts;
846 const Elf_Internal_Rela *rel, *relend;
847 unsigned long r_symndx;
848 struct elf_link_hash_entry *h;
849 bfd *dynobj;
850 asection *sgot;
851 asection *srelgot;
852
853 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
854 sym_hashes = elf_sym_hashes (abfd);
855 local_got_refcounts = elf_local_got_refcounts (abfd);
856
857 dynobj = elf_hash_table (info)->dynobj;
858 if (dynobj == NULL)
859 return true;
860
861 sgot = bfd_get_section_by_name (dynobj, ".got");
862 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
863
864 relend = relocs + sec->reloc_count;
865 for (rel = relocs; rel < relend; rel++)
866 {
867 switch (ELF32_R_TYPE (rel->r_info))
868 {
869 case R_68K_GOT8:
870 case R_68K_GOT16:
871 case R_68K_GOT32:
872 case R_68K_GOT8O:
873 case R_68K_GOT16O:
874 case R_68K_GOT32O:
875 r_symndx = ELF32_R_SYM (rel->r_info);
876 if (r_symndx >= symtab_hdr->sh_info)
877 {
878 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
879 if (h->got.refcount > 0)
880 {
881 --h->got.refcount;
882 if (h->got.refcount == 0)
883 {
884 /* We don't need the .got entry any more. */
885 sgot->_raw_size -= 4;
886 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
887 }
888 }
889 }
890 else if (local_got_refcounts != NULL)
891 {
892 if (local_got_refcounts[r_symndx] > 0)
893 {
894 --local_got_refcounts[r_symndx];
895 if (local_got_refcounts[r_symndx] == 0)
896 {
897 /* We don't need the .got entry any more. */
898 sgot->_raw_size -= 4;
899 if (info->shared)
900 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
901 }
902 }
903 }
904 break;
905
906 case R_68K_PLT8:
907 case R_68K_PLT16:
908 case R_68K_PLT32:
909 case R_68K_PLT8O:
910 case R_68K_PLT16O:
911 case R_68K_PLT32O:
912 case R_68K_PC8:
913 case R_68K_PC16:
914 case R_68K_PC32:
915 case R_68K_8:
916 case R_68K_16:
917 case R_68K_32:
918 r_symndx = ELF32_R_SYM (rel->r_info);
919 if (r_symndx >= symtab_hdr->sh_info)
920 {
921 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
922 if (h->plt.refcount > 0)
923 --h->plt.refcount;
924 }
925 break;
926
927 default:
928 break;
929 }
930 }
931
932 return true;
933 }
934
935 /* Adjust a symbol defined by a dynamic object and referenced by a
936 regular object. The current definition is in some section of the
937 dynamic object, but we're not including those sections. We have to
938 change the definition to something the rest of the link can
939 understand. */
940
941 static boolean
942 elf_m68k_adjust_dynamic_symbol (info, h)
943 struct bfd_link_info *info;
944 struct elf_link_hash_entry *h;
945 {
946 bfd *dynobj;
947 asection *s;
948 unsigned int power_of_two;
949
950 dynobj = elf_hash_table (info)->dynobj;
951
952 /* Make sure we know what is going on here. */
953 BFD_ASSERT (dynobj != NULL
954 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
955 || h->weakdef != NULL
956 || ((h->elf_link_hash_flags
957 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
958 && (h->elf_link_hash_flags
959 & ELF_LINK_HASH_REF_REGULAR) != 0
960 && (h->elf_link_hash_flags
961 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
962
963 /* If this is a function, put it in the procedure linkage table. We
964 will fill in the contents of the procedure linkage table later,
965 when we know the address of the .got section. */
966 if (h->type == STT_FUNC
967 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
968 {
969 if (! info->shared
970 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
971 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
972 /* We must always create the plt entry if it was referenced
973 by a PLTxxO relocation. In this case we already recorded
974 it as a dynamic symbol. */
975 && h->dynindx == -1)
976 {
977 /* This case can occur if we saw a PLTxx reloc in an input
978 file, but the symbol was never referred to by a dynamic
979 object. In such a case, we don't actually need to build
980 a procedure linkage table, and we can just do a PCxx
981 reloc instead. */
982 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
983 h->plt.offset = (bfd_vma) -1;
984 return true;
985 }
986
987 /* GC may have rendered this entry unused. */
988 if (h->plt.refcount <= 0)
989 {
990 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
991 h->plt.offset = (bfd_vma) -1;
992 return true;
993 }
994
995 /* Make sure this symbol is output as a dynamic symbol. */
996 if (h->dynindx == -1)
997 {
998 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
999 return false;
1000 }
1001
1002 s = bfd_get_section_by_name (dynobj, ".plt");
1003 BFD_ASSERT (s != NULL);
1004
1005 /* If this is the first .plt entry, make room for the special
1006 first entry. */
1007 if (s->_raw_size == 0)
1008 {
1009 if (CPU32_FLAG (dynobj))
1010 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1011 else
1012 s->_raw_size += PLT_ENTRY_SIZE;
1013 }
1014
1015 /* If this symbol is not defined in a regular file, and we are
1016 not generating a shared library, then set the symbol to this
1017 location in the .plt. This is required to make function
1018 pointers compare as equal between the normal executable and
1019 the shared library. */
1020 if (!info->shared
1021 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1022 {
1023 h->root.u.def.section = s;
1024 h->root.u.def.value = s->_raw_size;
1025 }
1026
1027 h->plt.offset = s->_raw_size;
1028
1029 /* Make room for this entry. */
1030 if (CPU32_FLAG (dynobj))
1031 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1032 else
1033 s->_raw_size += PLT_ENTRY_SIZE;
1034
1035 /* We also need to make an entry in the .got.plt section, which
1036 will be placed in the .got section by the linker script. */
1037
1038 s = bfd_get_section_by_name (dynobj, ".got.plt");
1039 BFD_ASSERT (s != NULL);
1040 s->_raw_size += 4;
1041
1042 /* We also need to make an entry in the .rela.plt section. */
1043
1044 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1045 BFD_ASSERT (s != NULL);
1046 s->_raw_size += sizeof (Elf32_External_Rela);
1047
1048 return true;
1049 }
1050
1051 /* Reinitialize the plt offset now that it is not used as a reference
1052 count any more. */
1053 h->plt.offset = (bfd_vma) -1;
1054
1055 /* If this is a weak symbol, and there is a real definition, the
1056 processor independent code will have arranged for us to see the
1057 real definition first, and we can just use the same value. */
1058 if (h->weakdef != NULL)
1059 {
1060 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1061 || h->weakdef->root.type == bfd_link_hash_defweak);
1062 h->root.u.def.section = h->weakdef->root.u.def.section;
1063 h->root.u.def.value = h->weakdef->root.u.def.value;
1064 return true;
1065 }
1066
1067 /* This is a reference to a symbol defined by a dynamic object which
1068 is not a function. */
1069
1070 /* If we are creating a shared library, we must presume that the
1071 only references to the symbol are via the global offset table.
1072 For such cases we need not do anything here; the relocations will
1073 be handled correctly by relocate_section. */
1074 if (info->shared)
1075 return true;
1076
1077 /* We must allocate the symbol in our .dynbss section, which will
1078 become part of the .bss section of the executable. There will be
1079 an entry for this symbol in the .dynsym section. The dynamic
1080 object will contain position independent code, so all references
1081 from the dynamic object to this symbol will go through the global
1082 offset table. The dynamic linker will use the .dynsym entry to
1083 determine the address it must put in the global offset table, so
1084 both the dynamic object and the regular object will refer to the
1085 same memory location for the variable. */
1086
1087 s = bfd_get_section_by_name (dynobj, ".dynbss");
1088 BFD_ASSERT (s != NULL);
1089
1090 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1091 copy the initial value out of the dynamic object and into the
1092 runtime process image. We need to remember the offset into the
1093 .rela.bss section we are going to use. */
1094 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1095 {
1096 asection *srel;
1097
1098 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1099 BFD_ASSERT (srel != NULL);
1100 srel->_raw_size += sizeof (Elf32_External_Rela);
1101 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1102 }
1103
1104 /* We need to figure out the alignment required for this symbol. I
1105 have no idea how ELF linkers handle this. */
1106 power_of_two = bfd_log2 (h->size);
1107 if (power_of_two > 3)
1108 power_of_two = 3;
1109
1110 /* Apply the required alignment. */
1111 s->_raw_size = BFD_ALIGN (s->_raw_size,
1112 (bfd_size_type) (1 << power_of_two));
1113 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1114 {
1115 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1116 return false;
1117 }
1118
1119 /* Define the symbol as being at this point in the section. */
1120 h->root.u.def.section = s;
1121 h->root.u.def.value = s->_raw_size;
1122
1123 /* Increment the section size to make room for the symbol. */
1124 s->_raw_size += h->size;
1125
1126 return true;
1127 }
1128
1129 /* Set the sizes of the dynamic sections. */
1130
1131 static boolean
1132 elf_m68k_size_dynamic_sections (output_bfd, info)
1133 bfd *output_bfd;
1134 struct bfd_link_info *info;
1135 {
1136 bfd *dynobj;
1137 asection *s;
1138 boolean plt;
1139 boolean relocs;
1140 boolean reltext;
1141
1142 dynobj = elf_hash_table (info)->dynobj;
1143 BFD_ASSERT (dynobj != NULL);
1144
1145 if (elf_hash_table (info)->dynamic_sections_created)
1146 {
1147 /* Set the contents of the .interp section to the interpreter. */
1148 if (!info->shared)
1149 {
1150 s = bfd_get_section_by_name (dynobj, ".interp");
1151 BFD_ASSERT (s != NULL);
1152 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1153 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1154 }
1155 }
1156 else
1157 {
1158 /* We may have created entries in the .rela.got section.
1159 However, if we are not creating the dynamic sections, we will
1160 not actually use these entries. Reset the size of .rela.got,
1161 which will cause it to get stripped from the output file
1162 below. */
1163 s = bfd_get_section_by_name (dynobj, ".rela.got");
1164 if (s != NULL)
1165 s->_raw_size = 0;
1166 }
1167
1168 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1169 relative relocs against symbols defined in a regular object. We
1170 allocated space for them in the check_relocs routine, but we will not
1171 fill them in in the relocate_section routine. */
1172 if (info->shared && info->symbolic)
1173 elf_m68k_link_hash_traverse (elf_m68k_hash_table (info),
1174 elf_m68k_discard_copies,
1175 (PTR) NULL);
1176
1177 /* The check_relocs and adjust_dynamic_symbol entry points have
1178 determined the sizes of the various dynamic sections. Allocate
1179 memory for them. */
1180 plt = false;
1181 relocs = false;
1182 reltext = false;
1183 for (s = dynobj->sections; s != NULL; s = s->next)
1184 {
1185 const char *name;
1186 boolean strip;
1187
1188 if ((s->flags & SEC_LINKER_CREATED) == 0)
1189 continue;
1190
1191 /* It's OK to base decisions on the section name, because none
1192 of the dynobj section names depend upon the input files. */
1193 name = bfd_get_section_name (dynobj, s);
1194
1195 strip = false;
1196
1197 if (strcmp (name, ".plt") == 0)
1198 {
1199 if (s->_raw_size == 0)
1200 {
1201 /* Strip this section if we don't need it; see the
1202 comment below. */
1203 strip = true;
1204 }
1205 else
1206 {
1207 /* Remember whether there is a PLT. */
1208 plt = true;
1209 }
1210 }
1211 else if (strncmp (name, ".rela", 5) == 0)
1212 {
1213 if (s->_raw_size == 0)
1214 {
1215 /* If we don't need this section, strip it from the
1216 output file. This is mostly to handle .rela.bss and
1217 .rela.plt. We must create both sections in
1218 create_dynamic_sections, because they must be created
1219 before the linker maps input sections to output
1220 sections. The linker does that before
1221 adjust_dynamic_symbol is called, and it is that
1222 function which decides whether anything needs to go
1223 into these sections. */
1224 strip = true;
1225 }
1226 else
1227 {
1228 asection *target;
1229
1230 /* Remember whether there are any reloc sections other
1231 than .rela.plt. */
1232 if (strcmp (name, ".rela.plt") != 0)
1233 {
1234 const char *outname;
1235
1236 relocs = true;
1237
1238 /* If this relocation section applies to a read only
1239 section, then we probably need a DT_TEXTREL
1240 entry. .rela.plt is actually associated with
1241 .got.plt, which is never readonly. */
1242 outname = bfd_get_section_name (output_bfd,
1243 s->output_section);
1244 target = bfd_get_section_by_name (output_bfd, outname + 5);
1245 if (target != NULL
1246 && (target->flags & SEC_READONLY) != 0
1247 && (target->flags & SEC_ALLOC) != 0)
1248 reltext = true;
1249 }
1250
1251 /* We use the reloc_count field as a counter if we need
1252 to copy relocs into the output file. */
1253 s->reloc_count = 0;
1254 }
1255 }
1256 else if (strncmp (name, ".got", 4) != 0)
1257 {
1258 /* It's not one of our sections, so don't allocate space. */
1259 continue;
1260 }
1261
1262 if (strip)
1263 {
1264 _bfd_strip_section_from_output (info, s);
1265 continue;
1266 }
1267
1268 /* Allocate memory for the section contents. */
1269 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1270 Unused entries should be reclaimed before the section's contents
1271 are written out, but at the moment this does not happen. Thus in
1272 order to prevent writing out garbage, we initialise the section's
1273 contents to zero. */
1274 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1275 if (s->contents == NULL && s->_raw_size != 0)
1276 return false;
1277 }
1278
1279 if (elf_hash_table (info)->dynamic_sections_created)
1280 {
1281 /* Add some entries to the .dynamic section. We fill in the
1282 values later, in elf_m68k_finish_dynamic_sections, but we
1283 must add the entries now so that we get the correct size for
1284 the .dynamic section. The DT_DEBUG entry is filled in by the
1285 dynamic linker and used by the debugger. */
1286 if (!info->shared)
1287 {
1288 if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
1289 return false;
1290 }
1291
1292 if (plt)
1293 {
1294 if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
1295 || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
1296 || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
1297 || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
1298 return false;
1299 }
1300
1301 if (relocs)
1302 {
1303 if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
1304 || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
1305 || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
1306 sizeof (Elf32_External_Rela)))
1307 return false;
1308 }
1309
1310 if (reltext)
1311 {
1312 if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
1313 return false;
1314 info->flags |= DF_TEXTREL;
1315 }
1316 }
1317
1318 return true;
1319 }
1320
1321 /* This function is called via elf_m68k_link_hash_traverse if we are
1322 creating a shared object with -Bsymbolic. It discards the space
1323 allocated to copy PC relative relocs against symbols which are defined
1324 in regular objects. We allocated space for them in the check_relocs
1325 routine, but we won't fill them in in the relocate_section routine. */
1326
1327 /*ARGSUSED*/
1328 static boolean
1329 elf_m68k_discard_copies (h, ignore)
1330 struct elf_m68k_link_hash_entry *h;
1331 PTR ignore ATTRIBUTE_UNUSED;
1332 {
1333 struct elf_m68k_pcrel_relocs_copied *s;
1334
1335 /* We only discard relocs for symbols defined in a regular object. */
1336 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1337 return true;
1338
1339 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1340 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1341
1342 return true;
1343 }
1344
1345 /* Relocate an M68K ELF section. */
1346
1347 static boolean
1348 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1349 contents, relocs, local_syms, local_sections)
1350 bfd *output_bfd;
1351 struct bfd_link_info *info;
1352 bfd *input_bfd;
1353 asection *input_section;
1354 bfd_byte *contents;
1355 Elf_Internal_Rela *relocs;
1356 Elf_Internal_Sym *local_syms;
1357 asection **local_sections;
1358 {
1359 bfd *dynobj;
1360 Elf_Internal_Shdr *symtab_hdr;
1361 struct elf_link_hash_entry **sym_hashes;
1362 bfd_vma *local_got_offsets;
1363 asection *sgot;
1364 asection *splt;
1365 asection *sreloc;
1366 Elf_Internal_Rela *rel;
1367 Elf_Internal_Rela *relend;
1368
1369 dynobj = elf_hash_table (info)->dynobj;
1370 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1371 sym_hashes = elf_sym_hashes (input_bfd);
1372 local_got_offsets = elf_local_got_offsets (input_bfd);
1373
1374 sgot = NULL;
1375 splt = NULL;
1376 sreloc = NULL;
1377
1378 rel = relocs;
1379 relend = relocs + input_section->reloc_count;
1380 for (; rel < relend; rel++)
1381 {
1382 int r_type;
1383 reloc_howto_type *howto;
1384 unsigned long r_symndx;
1385 struct elf_link_hash_entry *h;
1386 Elf_Internal_Sym *sym;
1387 asection *sec;
1388 bfd_vma relocation;
1389 bfd_reloc_status_type r;
1390
1391 r_type = ELF32_R_TYPE (rel->r_info);
1392 if (r_type < 0 || r_type >= (int) R_68K_max)
1393 {
1394 bfd_set_error (bfd_error_bad_value);
1395 return false;
1396 }
1397 howto = howto_table + r_type;
1398
1399 r_symndx = ELF32_R_SYM (rel->r_info);
1400
1401 if (info->relocateable)
1402 {
1403 /* This is a relocateable link. We don't have to change
1404 anything, unless the reloc is against a section symbol,
1405 in which case we have to adjust according to where the
1406 section symbol winds up in the output section. */
1407 if (r_symndx < symtab_hdr->sh_info)
1408 {
1409 sym = local_syms + r_symndx;
1410 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1411 {
1412 sec = local_sections[r_symndx];
1413 rel->r_addend += sec->output_offset + sym->st_value;
1414 }
1415 }
1416
1417 continue;
1418 }
1419
1420 /* This is a final link. */
1421 h = NULL;
1422 sym = NULL;
1423 sec = NULL;
1424 if (r_symndx < symtab_hdr->sh_info)
1425 {
1426 sym = local_syms + r_symndx;
1427 sec = local_sections[r_symndx];
1428 relocation = (sec->output_section->vma
1429 + sec->output_offset
1430 + sym->st_value);
1431 }
1432 else
1433 {
1434 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1435 while (h->root.type == bfd_link_hash_indirect
1436 || h->root.type == bfd_link_hash_warning)
1437 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1438 if (h->root.type == bfd_link_hash_defined
1439 || h->root.type == bfd_link_hash_defweak)
1440 {
1441 sec = h->root.u.def.section;
1442 if (((r_type == R_68K_PLT8
1443 || r_type == R_68K_PLT16
1444 || r_type == R_68K_PLT32
1445 || r_type == R_68K_PLT8O
1446 || r_type == R_68K_PLT16O
1447 || r_type == R_68K_PLT32O)
1448 && h->plt.offset != (bfd_vma) -1
1449 && elf_hash_table (info)->dynamic_sections_created)
1450 || ((r_type == R_68K_GOT8O
1451 || r_type == R_68K_GOT16O
1452 || r_type == R_68K_GOT32O
1453 || ((r_type == R_68K_GOT8
1454 || r_type == R_68K_GOT16
1455 || r_type == R_68K_GOT32)
1456 && strcmp (h->root.root.string,
1457 "_GLOBAL_OFFSET_TABLE_") != 0))
1458 && elf_hash_table (info)->dynamic_sections_created
1459 && (! info->shared
1460 || (! info->symbolic && h->dynindx != -1)
1461 || (h->elf_link_hash_flags
1462 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1463 || (info->shared
1464 && ((! info->symbolic && h->dynindx != -1)
1465 || (h->elf_link_hash_flags
1466 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1467 && (input_section->flags & SEC_ALLOC) != 0
1468 && (r_type == R_68K_8
1469 || r_type == R_68K_16
1470 || r_type == R_68K_32
1471 || r_type == R_68K_PC8
1472 || r_type == R_68K_PC16
1473 || r_type == R_68K_PC32)))
1474 {
1475 /* In these cases, we don't need the relocation
1476 value. We check specially because in some
1477 obscure cases sec->output_section will be NULL. */
1478 relocation = 0;
1479 }
1480 else
1481 relocation = (h->root.u.def.value
1482 + sec->output_section->vma
1483 + sec->output_offset);
1484 }
1485 else if (h->root.type == bfd_link_hash_undefweak)
1486 relocation = 0;
1487 else if (info->shared && !info->symbolic
1488 && !info->no_undefined
1489 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1490 relocation = 0;
1491 else
1492 {
1493 if (!(info->callbacks->undefined_symbol
1494 (info, h->root.root.string, input_bfd,
1495 input_section, rel->r_offset,
1496 (!info->shared || info->no_undefined
1497 || ELF_ST_VISIBILITY (h->other)))))
1498 return false;
1499 relocation = 0;
1500 }
1501 }
1502
1503 switch (r_type)
1504 {
1505 case R_68K_GOT8:
1506 case R_68K_GOT16:
1507 case R_68K_GOT32:
1508 /* Relocation is to the address of the entry for this symbol
1509 in the global offset table. */
1510 if (h != NULL
1511 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1512 break;
1513 /* Fall through. */
1514 case R_68K_GOT8O:
1515 case R_68K_GOT16O:
1516 case R_68K_GOT32O:
1517 /* Relocation is the offset of the entry for this symbol in
1518 the global offset table. */
1519
1520 {
1521 bfd_vma off;
1522
1523 if (sgot == NULL)
1524 {
1525 sgot = bfd_get_section_by_name (dynobj, ".got");
1526 BFD_ASSERT (sgot != NULL);
1527 }
1528
1529 if (h != NULL)
1530 {
1531 off = h->got.offset;
1532 BFD_ASSERT (off != (bfd_vma) -1);
1533
1534 if (!elf_hash_table (info)->dynamic_sections_created
1535 || (info->shared
1536 && (info->symbolic || h->dynindx == -1)
1537 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1538 {
1539 /* This is actually a static link, or it is a
1540 -Bsymbolic link and the symbol is defined
1541 locally, or the symbol was forced to be local
1542 because of a version file.. We must initialize
1543 this entry in the global offset table. Since
1544 the offset must always be a multiple of 4, we
1545 use the least significant bit to record whether
1546 we have initialized it already.
1547
1548 When doing a dynamic link, we create a .rela.got
1549 relocation entry to initialize the value. This
1550 is done in the finish_dynamic_symbol routine. */
1551 if ((off & 1) != 0)
1552 off &= ~1;
1553 else
1554 {
1555 bfd_put_32 (output_bfd, relocation,
1556 sgot->contents + off);
1557 h->got.offset |= 1;
1558 }
1559 }
1560 }
1561 else
1562 {
1563 BFD_ASSERT (local_got_offsets != NULL
1564 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1565
1566 off = local_got_offsets[r_symndx];
1567
1568 /* The offset must always be a multiple of 4. We use
1569 the least significant bit to record whether we have
1570 already generated the necessary reloc. */
1571 if ((off & 1) != 0)
1572 off &= ~1;
1573 else
1574 {
1575 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1576
1577 if (info->shared)
1578 {
1579 asection *srelgot;
1580 Elf_Internal_Rela outrel;
1581
1582 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1583 BFD_ASSERT (srelgot != NULL);
1584
1585 outrel.r_offset = (sgot->output_section->vma
1586 + sgot->output_offset
1587 + off);
1588 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1589 outrel.r_addend = relocation;
1590 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1591 (((Elf32_External_Rela *)
1592 srelgot->contents)
1593 + srelgot->reloc_count));
1594 ++srelgot->reloc_count;
1595 }
1596
1597 local_got_offsets[r_symndx] |= 1;
1598 }
1599 }
1600
1601 relocation = sgot->output_offset + off;
1602 if (r_type == R_68K_GOT8O
1603 || r_type == R_68K_GOT16O
1604 || r_type == R_68K_GOT32O)
1605 {
1606 /* This relocation does not use the addend. */
1607 rel->r_addend = 0;
1608 }
1609 else
1610 relocation += sgot->output_section->vma;
1611 }
1612 break;
1613
1614 case R_68K_PLT8:
1615 case R_68K_PLT16:
1616 case R_68K_PLT32:
1617 /* Relocation is to the entry for this symbol in the
1618 procedure linkage table. */
1619
1620 /* Resolve a PLTxx reloc against a local symbol directly,
1621 without using the procedure linkage table. */
1622 if (h == NULL)
1623 break;
1624
1625 if (h->plt.offset == (bfd_vma) -1
1626 || !elf_hash_table (info)->dynamic_sections_created)
1627 {
1628 /* We didn't make a PLT entry for this symbol. This
1629 happens when statically linking PIC code, or when
1630 using -Bsymbolic. */
1631 break;
1632 }
1633
1634 if (splt == NULL)
1635 {
1636 splt = bfd_get_section_by_name (dynobj, ".plt");
1637 BFD_ASSERT (splt != NULL);
1638 }
1639
1640 relocation = (splt->output_section->vma
1641 + splt->output_offset
1642 + h->plt.offset);
1643 break;
1644
1645 case R_68K_PLT8O:
1646 case R_68K_PLT16O:
1647 case R_68K_PLT32O:
1648 /* Relocation is the offset of the entry for this symbol in
1649 the procedure linkage table. */
1650 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1651
1652 if (splt == NULL)
1653 {
1654 splt = bfd_get_section_by_name (dynobj, ".plt");
1655 BFD_ASSERT (splt != NULL);
1656 }
1657
1658 relocation = h->plt.offset;
1659
1660 /* This relocation does not use the addend. */
1661 rel->r_addend = 0;
1662
1663 break;
1664
1665 case R_68K_PC8:
1666 case R_68K_PC16:
1667 case R_68K_PC32:
1668 if (h == NULL)
1669 break;
1670 /* Fall through. */
1671 case R_68K_8:
1672 case R_68K_16:
1673 case R_68K_32:
1674 if (info->shared
1675 && (input_section->flags & SEC_ALLOC) != 0
1676 && ((r_type != R_68K_PC8
1677 && r_type != R_68K_PC16
1678 && r_type != R_68K_PC32)
1679 || (!info->symbolic
1680 || (h->elf_link_hash_flags
1681 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1682 {
1683 Elf_Internal_Rela outrel;
1684 boolean skip, relocate;
1685
1686 /* When generating a shared object, these relocations
1687 are copied into the output file to be resolved at run
1688 time. */
1689
1690 if (sreloc == NULL)
1691 {
1692 const char *name;
1693
1694 name = (bfd_elf_string_from_elf_section
1695 (input_bfd,
1696 elf_elfheader (input_bfd)->e_shstrndx,
1697 elf_section_data (input_section)->rel_hdr.sh_name));
1698 if (name == NULL)
1699 return false;
1700
1701 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1702 && strcmp (bfd_get_section_name (input_bfd,
1703 input_section),
1704 name + 5) == 0);
1705
1706 sreloc = bfd_get_section_by_name (dynobj, name);
1707 BFD_ASSERT (sreloc != NULL);
1708 }
1709
1710 skip = false;
1711
1712 if (elf_section_data (input_section)->stab_info == NULL)
1713 outrel.r_offset = rel->r_offset;
1714 else
1715 {
1716 bfd_vma off;
1717
1718 off = (_bfd_stab_section_offset
1719 (output_bfd, &elf_hash_table (info)->stab_info,
1720 input_section,
1721 &elf_section_data (input_section)->stab_info,
1722 rel->r_offset));
1723 if (off == (bfd_vma) -1)
1724 skip = true;
1725 outrel.r_offset = off;
1726 }
1727
1728 outrel.r_offset += (input_section->output_section->vma
1729 + input_section->output_offset);
1730
1731 if (skip)
1732 {
1733 memset (&outrel, 0, sizeof outrel);
1734 relocate = false;
1735 }
1736 /* h->dynindx may be -1 if the symbol was marked to
1737 become local. */
1738 else if (h != NULL
1739 && ((! info->symbolic && h->dynindx != -1)
1740 || (h->elf_link_hash_flags
1741 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1742 {
1743 BFD_ASSERT (h->dynindx != -1);
1744 relocate = false;
1745 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1746 outrel.r_addend = relocation + rel->r_addend;
1747 }
1748 else
1749 {
1750 if (r_type == R_68K_32)
1751 {
1752 relocate = true;
1753 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1754 outrel.r_addend = relocation + rel->r_addend;
1755 }
1756 else
1757 {
1758 long indx;
1759
1760 if (h == NULL)
1761 sec = local_sections[r_symndx];
1762 else
1763 {
1764 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1765 || (h->root.type
1766 == bfd_link_hash_defweak));
1767 sec = h->root.u.def.section;
1768 }
1769 if (sec != NULL && bfd_is_abs_section (sec))
1770 indx = 0;
1771 else if (sec == NULL || sec->owner == NULL)
1772 {
1773 bfd_set_error (bfd_error_bad_value);
1774 return false;
1775 }
1776 else
1777 {
1778 asection *osec;
1779
1780 osec = sec->output_section;
1781 indx = elf_section_data (osec)->dynindx;
1782 BFD_ASSERT (indx > 0);
1783 }
1784
1785 relocate = false;
1786 outrel.r_info = ELF32_R_INFO (indx, r_type);
1787 outrel.r_addend = relocation + rel->r_addend;
1788 }
1789 }
1790
1791 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1792 (((Elf32_External_Rela *)
1793 sreloc->contents)
1794 + sreloc->reloc_count));
1795 ++sreloc->reloc_count;
1796
1797 /* This reloc will be computed at runtime, so there's no
1798 need to do anything now, except for R_68K_32
1799 relocations that have been turned into
1800 R_68K_RELATIVE. */
1801 if (!relocate)
1802 continue;
1803 }
1804
1805 break;
1806
1807 case R_68K_GNU_VTINHERIT:
1808 case R_68K_GNU_VTENTRY:
1809 /* These are no-ops in the end. */
1810 continue;
1811
1812 default:
1813 break;
1814 }
1815
1816 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1817 contents, rel->r_offset,
1818 relocation, rel->r_addend);
1819
1820 if (r != bfd_reloc_ok)
1821 {
1822 switch (r)
1823 {
1824 default:
1825 case bfd_reloc_outofrange:
1826 abort ();
1827 case bfd_reloc_overflow:
1828 {
1829 const char *name;
1830
1831 if (h != NULL)
1832 name = h->root.root.string;
1833 else
1834 {
1835 name = bfd_elf_string_from_elf_section (input_bfd,
1836 symtab_hdr->sh_link,
1837 sym->st_name);
1838 if (name == NULL)
1839 return false;
1840 if (*name == '\0')
1841 name = bfd_section_name (input_bfd, sec);
1842 }
1843 if (!(info->callbacks->reloc_overflow
1844 (info, name, howto->name, (bfd_vma) 0,
1845 input_bfd, input_section, rel->r_offset)))
1846 return false;
1847 }
1848 break;
1849 }
1850 }
1851 }
1852
1853 return true;
1854 }
1855
1856 /* Finish up dynamic symbol handling. We set the contents of various
1857 dynamic sections here. */
1858
1859 static boolean
1860 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1861 bfd *output_bfd;
1862 struct bfd_link_info *info;
1863 struct elf_link_hash_entry *h;
1864 Elf_Internal_Sym *sym;
1865 {
1866 bfd *dynobj;
1867 int plt_off1, plt_off2, plt_off3;
1868
1869 dynobj = elf_hash_table (info)->dynobj;
1870
1871 if (h->plt.offset != (bfd_vma) -1)
1872 {
1873 asection *splt;
1874 asection *sgot;
1875 asection *srela;
1876 bfd_vma plt_index;
1877 bfd_vma got_offset;
1878 Elf_Internal_Rela rela;
1879
1880 /* This symbol has an entry in the procedure linkage table. Set
1881 it up. */
1882
1883 BFD_ASSERT (h->dynindx != -1);
1884
1885 splt = bfd_get_section_by_name (dynobj, ".plt");
1886 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1887 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1888 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1889
1890 /* Get the index in the procedure linkage table which
1891 corresponds to this symbol. This is the index of this symbol
1892 in all the symbols for which we are making plt entries. The
1893 first entry in the procedure linkage table is reserved. */
1894 if ( CPU32_FLAG (output_bfd))
1895 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1896 else
1897 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1898
1899 /* Get the offset into the .got table of the entry that
1900 corresponds to this function. Each .got entry is 4 bytes.
1901 The first three are reserved. */
1902 got_offset = (plt_index + 3) * 4;
1903
1904 if ( CPU32_FLAG (output_bfd))
1905 {
1906 /* Fill in the entry in the procedure linkage table. */
1907 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1908 PLT_CPU32_ENTRY_SIZE);
1909 plt_off1 = 4;
1910 plt_off2 = 12;
1911 plt_off3 = 18;
1912 }
1913 else
1914 {
1915 /* Fill in the entry in the procedure linkage table. */
1916 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1917 PLT_ENTRY_SIZE);
1918 plt_off1 = 4;
1919 plt_off2 = 10;
1920 plt_off3 = 16;
1921 }
1922
1923 /* The offset is relative to the first extension word. */
1924 bfd_put_32 (output_bfd,
1925 (sgot->output_section->vma
1926 + sgot->output_offset
1927 + got_offset
1928 - (splt->output_section->vma
1929 + h->plt.offset + 2)),
1930 splt->contents + h->plt.offset + plt_off1);
1931
1932 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1933 splt->contents + h->plt.offset + plt_off2);
1934 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1935 splt->contents + h->plt.offset + plt_off3);
1936
1937 /* Fill in the entry in the global offset table. */
1938 bfd_put_32 (output_bfd,
1939 (splt->output_section->vma
1940 + splt->output_offset
1941 + h->plt.offset
1942 + 8),
1943 sgot->contents + got_offset);
1944
1945 /* Fill in the entry in the .rela.plt section. */
1946 rela.r_offset = (sgot->output_section->vma
1947 + sgot->output_offset
1948 + got_offset);
1949 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1950 rela.r_addend = 0;
1951 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1952 ((Elf32_External_Rela *) srela->contents
1953 + plt_index));
1954
1955 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1956 {
1957 /* Mark the symbol as undefined, rather than as defined in
1958 the .plt section. Leave the value alone. */
1959 sym->st_shndx = SHN_UNDEF;
1960 }
1961 }
1962
1963 if (h->got.offset != (bfd_vma) -1)
1964 {
1965 asection *sgot;
1966 asection *srela;
1967 Elf_Internal_Rela rela;
1968
1969 /* This symbol has an entry in the global offset table. Set it
1970 up. */
1971
1972 sgot = bfd_get_section_by_name (dynobj, ".got");
1973 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1974 BFD_ASSERT (sgot != NULL && srela != NULL);
1975
1976 rela.r_offset = (sgot->output_section->vma
1977 + sgot->output_offset
1978 + (h->got.offset &~ 1));
1979
1980 /* If this is a -Bsymbolic link, and the symbol is defined
1981 locally, we just want to emit a RELATIVE reloc. Likewise if
1982 the symbol was forced to be local because of a version file.
1983 The entry in the global offset table will already have been
1984 initialized in the relocate_section function. */
1985 if (info->shared
1986 && (info->symbolic || h->dynindx == -1)
1987 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1988 {
1989 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1990 rela.r_addend = bfd_get_signed_32 (output_bfd,
1991 (sgot->contents
1992 + (h->got.offset & ~1)));
1993 }
1994 else
1995 {
1996 bfd_put_32 (output_bfd, (bfd_vma) 0,
1997 sgot->contents + (h->got.offset & ~1));
1998 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1999 rela.r_addend = 0;
2000 }
2001
2002 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2003 ((Elf32_External_Rela *) srela->contents
2004 + srela->reloc_count));
2005 ++srela->reloc_count;
2006 }
2007
2008 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2009 {
2010 asection *s;
2011 Elf_Internal_Rela rela;
2012
2013 /* This symbol needs a copy reloc. Set it up. */
2014
2015 BFD_ASSERT (h->dynindx != -1
2016 && (h->root.type == bfd_link_hash_defined
2017 || h->root.type == bfd_link_hash_defweak));
2018
2019 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2020 ".rela.bss");
2021 BFD_ASSERT (s != NULL);
2022
2023 rela.r_offset = (h->root.u.def.value
2024 + h->root.u.def.section->output_section->vma
2025 + h->root.u.def.section->output_offset);
2026 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
2027 rela.r_addend = 0;
2028 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2029 ((Elf32_External_Rela *) s->contents
2030 + s->reloc_count));
2031 ++s->reloc_count;
2032 }
2033
2034 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2035 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2036 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2037 sym->st_shndx = SHN_ABS;
2038
2039 return true;
2040 }
2041
2042 /* Finish up the dynamic sections. */
2043
2044 static boolean
2045 elf_m68k_finish_dynamic_sections (output_bfd, info)
2046 bfd *output_bfd;
2047 struct bfd_link_info *info;
2048 {
2049 bfd *dynobj;
2050 asection *sgot;
2051 asection *sdyn;
2052
2053 dynobj = elf_hash_table (info)->dynobj;
2054
2055 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2056 BFD_ASSERT (sgot != NULL);
2057 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2058
2059 if (elf_hash_table (info)->dynamic_sections_created)
2060 {
2061 asection *splt;
2062 Elf32_External_Dyn *dyncon, *dynconend;
2063
2064 splt = bfd_get_section_by_name (dynobj, ".plt");
2065 BFD_ASSERT (splt != NULL && sdyn != NULL);
2066
2067 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2068 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2069 for (; dyncon < dynconend; dyncon++)
2070 {
2071 Elf_Internal_Dyn dyn;
2072 const char *name;
2073 asection *s;
2074
2075 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2076
2077 switch (dyn.d_tag)
2078 {
2079 default:
2080 break;
2081
2082 case DT_PLTGOT:
2083 name = ".got";
2084 goto get_vma;
2085 case DT_JMPREL:
2086 name = ".rela.plt";
2087 get_vma:
2088 s = bfd_get_section_by_name (output_bfd, name);
2089 BFD_ASSERT (s != NULL);
2090 dyn.d_un.d_ptr = s->vma;
2091 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2092 break;
2093
2094 case DT_PLTRELSZ:
2095 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2096 BFD_ASSERT (s != NULL);
2097 if (s->_cooked_size != 0)
2098 dyn.d_un.d_val = s->_cooked_size;
2099 else
2100 dyn.d_un.d_val = s->_raw_size;
2101 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2102 break;
2103
2104 case DT_RELASZ:
2105 /* The procedure linkage table relocs (DT_JMPREL) should
2106 not be included in the overall relocs (DT_RELA).
2107 Therefore, we override the DT_RELASZ entry here to
2108 make it not include the JMPREL relocs. Since the
2109 linker script arranges for .rela.plt to follow all
2110 other relocation sections, we don't have to worry
2111 about changing the DT_RELA entry. */
2112 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2113 if (s != NULL)
2114 {
2115 if (s->_cooked_size != 0)
2116 dyn.d_un.d_val -= s->_cooked_size;
2117 else
2118 dyn.d_un.d_val -= s->_raw_size;
2119 }
2120 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2121 break;
2122 }
2123 }
2124
2125 /* Fill in the first entry in the procedure linkage table. */
2126 if (splt->_raw_size > 0)
2127 {
2128 if (!CPU32_FLAG (output_bfd))
2129 {
2130 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2131 bfd_put_32 (output_bfd,
2132 (sgot->output_section->vma
2133 + sgot->output_offset + 4
2134 - (splt->output_section->vma + 2)),
2135 splt->contents + 4);
2136 bfd_put_32 (output_bfd,
2137 (sgot->output_section->vma
2138 + sgot->output_offset + 8
2139 - (splt->output_section->vma + 10)),
2140 splt->contents + 12);
2141 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2142 = PLT_ENTRY_SIZE;
2143 }
2144 else /* cpu32 */
2145 {
2146 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2147 bfd_put_32 (output_bfd,
2148 (sgot->output_section->vma
2149 + sgot->output_offset + 4
2150 - (splt->output_section->vma + 2)),
2151 splt->contents + 4);
2152 bfd_put_32 (output_bfd,
2153 (sgot->output_section->vma
2154 + sgot->output_offset + 8
2155 - (splt->output_section->vma + 10)),
2156 splt->contents + 12);
2157 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2158 = PLT_CPU32_ENTRY_SIZE;
2159 }
2160 }
2161 }
2162
2163 /* Fill in the first three entries in the global offset table. */
2164 if (sgot->_raw_size > 0)
2165 {
2166 if (sdyn == NULL)
2167 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2168 else
2169 bfd_put_32 (output_bfd,
2170 sdyn->output_section->vma + sdyn->output_offset,
2171 sgot->contents);
2172 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2173 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2174 }
2175
2176 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2177
2178 return true;
2179 }
2180
2181 /* Given a .data section and a .emreloc in-memory section, store
2182 relocation information into the .emreloc section which can be
2183 used at runtime to relocate the section. This is called by the
2184 linker when the --embedded-relocs switch is used. This is called
2185 after the add_symbols entry point has been called for all the
2186 objects, and before the final_link entry point is called. */
2187
2188 boolean
2189 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2190 bfd *abfd;
2191 struct bfd_link_info *info;
2192 asection *datasec;
2193 asection *relsec;
2194 char **errmsg;
2195 {
2196 Elf_Internal_Shdr *symtab_hdr;
2197 Elf32_External_Sym *extsyms;
2198 Elf32_External_Sym *free_extsyms = NULL;
2199 Elf_Internal_Rela *internal_relocs;
2200 Elf_Internal_Rela *free_relocs = NULL;
2201 Elf_Internal_Rela *irel, *irelend;
2202 bfd_byte *p;
2203
2204 BFD_ASSERT (! info->relocateable);
2205
2206 *errmsg = NULL;
2207
2208 if (datasec->reloc_count == 0)
2209 return true;
2210
2211 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2212 /* Read this BFD's symbols if we haven't done so already, or get the cached
2213 copy if it exists. */
2214 if (symtab_hdr->contents != NULL)
2215 extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
2216 else
2217 {
2218 /* Go get them off disk. */
2219 if (info->keep_memory)
2220 extsyms = ((Elf32_External_Sym *)
2221 bfd_alloc (abfd, symtab_hdr->sh_size));
2222 else
2223 extsyms = ((Elf32_External_Sym *)
2224 bfd_malloc (symtab_hdr->sh_size));
2225 if (extsyms == NULL)
2226 goto error_return;
2227 if (! info->keep_memory)
2228 free_extsyms = extsyms;
2229 if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
2230 || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd)
2231 != symtab_hdr->sh_size))
2232 goto error_return;
2233 if (info->keep_memory)
2234 symtab_hdr->contents = extsyms;
2235 }
2236
2237 /* Get a copy of the native relocations. */
2238 internal_relocs = (_bfd_elf32_link_read_relocs
2239 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2240 info->keep_memory));
2241 if (internal_relocs == NULL)
2242 goto error_return;
2243 if (! info->keep_memory)
2244 free_relocs = internal_relocs;
2245
2246 relsec->contents = (bfd_byte *) bfd_alloc (abfd, datasec->reloc_count * 12);
2247 if (relsec->contents == NULL)
2248 goto error_return;
2249
2250 p = relsec->contents;
2251
2252 irelend = internal_relocs + datasec->reloc_count;
2253 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2254 {
2255 asection *targetsec;
2256
2257 /* We are going to write a four byte longword into the runtime
2258 reloc section. The longword will be the address in the data
2259 section which must be relocated. It is followed by the name
2260 of the target section NUL-padded or truncated to 8
2261 characters. */
2262
2263 /* We can only relocate absolute longword relocs at run time. */
2264 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2265 {
2266 *errmsg = _("unsupported reloc type");
2267 bfd_set_error (bfd_error_bad_value);
2268 goto error_return;
2269 }
2270
2271 /* Get the target section referred to by the reloc. */
2272 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2273 {
2274 Elf_Internal_Sym isym;
2275
2276 /* A local symbol. */
2277 bfd_elf32_swap_symbol_in (abfd,
2278 extsyms + ELF32_R_SYM (irel->r_info),
2279 &isym);
2280
2281 targetsec = bfd_section_from_elf_index (abfd, isym.st_shndx);
2282 }
2283 else
2284 {
2285 unsigned long indx;
2286 struct elf_link_hash_entry *h;
2287
2288 /* An external symbol. */
2289 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2290 h = elf_sym_hashes (abfd)[indx];
2291 BFD_ASSERT (h != NULL);
2292 if (h->root.type == bfd_link_hash_defined
2293 || h->root.type == bfd_link_hash_defweak)
2294 targetsec = h->root.u.def.section;
2295 else
2296 targetsec = NULL;
2297 }
2298
2299 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2300 memset (p + 4, 0, 8);
2301 if (targetsec != NULL)
2302 strncpy (p + 4, targetsec->output_section->name, 8);
2303 }
2304
2305 if (free_extsyms != NULL)
2306 free (free_extsyms);
2307 if (free_relocs != NULL)
2308 free (free_relocs);
2309 return true;
2310
2311 error_return:
2312 if (free_extsyms != NULL)
2313 free (free_extsyms);
2314 if (free_relocs != NULL)
2315 free (free_relocs);
2316 return false;
2317 }
2318
2319 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2320 #define TARGET_BIG_NAME "elf32-m68k"
2321 #define ELF_MACHINE_CODE EM_68K
2322 #define ELF_MAXPAGESIZE 0x2000
2323 #define elf_backend_create_dynamic_sections \
2324 _bfd_elf_create_dynamic_sections
2325 #define bfd_elf32_bfd_link_hash_table_create \
2326 elf_m68k_link_hash_table_create
2327 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2328
2329 #define elf_backend_check_relocs elf_m68k_check_relocs
2330 #define elf_backend_adjust_dynamic_symbol \
2331 elf_m68k_adjust_dynamic_symbol
2332 #define elf_backend_size_dynamic_sections \
2333 elf_m68k_size_dynamic_sections
2334 #define elf_backend_relocate_section elf_m68k_relocate_section
2335 #define elf_backend_finish_dynamic_symbol \
2336 elf_m68k_finish_dynamic_symbol
2337 #define elf_backend_finish_dynamic_sections \
2338 elf_m68k_finish_dynamic_sections
2339 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2340 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2341 #define bfd_elf32_bfd_copy_private_bfd_data \
2342 elf32_m68k_copy_private_bfd_data
2343 #define bfd_elf32_bfd_merge_private_bfd_data \
2344 elf32_m68k_merge_private_bfd_data
2345 #define bfd_elf32_bfd_set_private_flags \
2346 elf32_m68k_set_private_flags
2347 #define bfd_elf32_bfd_print_private_bfd_data \
2348 elf32_m68k_print_private_bfd_data
2349
2350 #define elf_backend_can_gc_sections 1
2351 #define elf_backend_want_got_plt 1
2352 #define elf_backend_plt_readonly 1
2353 #define elf_backend_want_plt_sym 0
2354 #define elf_backend_got_header_size 12
2355
2356 #include "elf32-target.h"
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