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file as.info-5 was initially added on branch binutils-2_10-branch.
[binutils.git] / bfd / elf32-m68k.c
blobb01523477b46a62d5dbb2529e2d0e0127ddce7d5
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 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
228 0, 0, 0, 0, /* replaced with offset to .got + 4. */
229 0x4e, 0xd1, /* jmp %a1@ */
230 0, 0, 0, 0, /* replace with offset to .got +8. */
231 0, 0, 0, 0, /* pad out to 24 bytes. */
232 0, 0, 0, 0, /* pad out to 24 bytes. */
233 0, 0
234 };
235
236 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
237 {
238 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
239 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
240 0x4e, 0xd1, /* jmp %a1@ */
241 0x2f, 0x3c, /* move.l #offset,-(%sp) */
242 0, 0, 0, 0, /* replaced with offset into relocation table. */
243 0x60, 0xff, /* bra.l .plt */
244 0, 0, 0, 0, /* replaced with offset to start of .plt. */
245 0, 0
246 };
247
248 /* The m68k linker needs to keep track of the number of relocs that it
249 decides to copy in check_relocs for each symbol. This is so that it
250 can discard PC relative relocs if it doesn't need them when linking
251 with -Bsymbolic. We store the information in a field extending the
252 regular ELF linker hash table. */
253
254 /* This structure keeps track of the number of PC relative relocs we have
255 copied for a given symbol. */
256
257 struct elf_m68k_pcrel_relocs_copied
258 {
259 /* Next section. */
260 struct elf_m68k_pcrel_relocs_copied *next;
261 /* A section in dynobj. */
262 asection *section;
263 /* Number of relocs copied in this section. */
264 bfd_size_type count;
265 };
266
267 /* m68k ELF linker hash entry. */
268
269 struct elf_m68k_link_hash_entry
270 {
271 struct elf_link_hash_entry root;
272
273 /* Number of PC relative relocs copied for this symbol. */
274 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
275 };
276
277 /* m68k ELF linker hash table. */
278
279 struct elf_m68k_link_hash_table
280 {
281 struct elf_link_hash_table root;
282 };
283
284 /* Declare this now that the above structures are defined. */
285
286 static boolean elf_m68k_discard_copies
287 PARAMS ((struct elf_m68k_link_hash_entry *, PTR));
288
289 /* Traverse an m68k ELF linker hash table. */
290
291 #define elf_m68k_link_hash_traverse(table, func, info) \
292 (elf_link_hash_traverse \
293 (&(table)->root, \
294 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
295 (info)))
296
297 /* Get the m68k ELF linker hash table from a link_info structure. */
298
299 #define elf_m68k_hash_table(p) \
300 ((struct elf_m68k_link_hash_table *) (p)->hash)
301
302 /* Create an entry in an m68k ELF linker hash table. */
303
304 static struct bfd_hash_entry *
305 elf_m68k_link_hash_newfunc (entry, table, string)
306 struct bfd_hash_entry *entry;
307 struct bfd_hash_table *table;
308 const char *string;
309 {
310 struct elf_m68k_link_hash_entry *ret =
311 (struct elf_m68k_link_hash_entry *) entry;
312
313 /* Allocate the structure if it has not already been allocated by a
314 subclass. */
315 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
316 ret = ((struct elf_m68k_link_hash_entry *)
317 bfd_hash_allocate (table,
318 sizeof (struct elf_m68k_link_hash_entry)));
319 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
320 return (struct bfd_hash_entry *) ret;
321
322 /* Call the allocation method of the superclass. */
323 ret = ((struct elf_m68k_link_hash_entry *)
324 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
325 table, string));
326 if (ret != (struct elf_m68k_link_hash_entry *) NULL)
327 {
328 ret->pcrel_relocs_copied = NULL;
329 }
330
331 return (struct bfd_hash_entry *) ret;
332 }
333
334 /* Create an m68k ELF linker hash table. */
335
336 static struct bfd_link_hash_table *
337 elf_m68k_link_hash_table_create (abfd)
338 bfd *abfd;
339 {
340 struct elf_m68k_link_hash_table *ret;
341
342 ret = ((struct elf_m68k_link_hash_table *)
343 bfd_alloc (abfd, sizeof (struct elf_m68k_link_hash_table)));
344 if (ret == (struct elf_m68k_link_hash_table *) NULL)
345 return NULL;
346
347 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
348 elf_m68k_link_hash_newfunc))
349 {
350 bfd_release (abfd, ret);
351 return NULL;
352 }
353
354 return &ret->root.root;
355 }
356
357 /* Keep m68k-specific flags in the ELF header */
358 static boolean
359 elf32_m68k_set_private_flags (abfd, flags)
360 bfd *abfd;
361 flagword flags;
362 {
363 elf_elfheader (abfd)->e_flags = flags;
364 elf_flags_init (abfd) = true;
365 return true;
366 }
367
368 /* Copy m68k-specific data from one module to another */
369 static boolean
370 elf32_m68k_copy_private_bfd_data (ibfd, obfd)
371 bfd *ibfd;
372 bfd *obfd;
373 {
374 flagword in_flags;
375
376 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
377 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
378 return true;
379
380 in_flags = elf_elfheader (ibfd)->e_flags;
381
382 elf_elfheader (obfd)->e_flags = in_flags;
383 elf_flags_init (obfd) = true;
384
385 return true;
386 }
387
388 /* Merge backend specific data from an object file to the output
389 object file when linking. */
390 static boolean
391 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
392 bfd *ibfd;
393 bfd *obfd;
394 {
395 flagword out_flags;
396 flagword in_flags;
397
398 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
399 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
400 return true;
401
402 in_flags = elf_elfheader (ibfd)->e_flags;
403 out_flags = elf_elfheader (obfd)->e_flags;
404
405 if (!elf_flags_init (obfd))
406 {
407 elf_flags_init (obfd) = true;
408 elf_elfheader (obfd)->e_flags = in_flags;
409 }
410
411 return true;
412 }
413
414 /* Display the flags field */
415 static boolean
416 elf32_m68k_print_private_bfd_data (abfd, ptr)
417 bfd *abfd;
418 PTR ptr;
419 {
420 FILE *file = (FILE *) ptr;
421
422 BFD_ASSERT (abfd != NULL && ptr != NULL);
423
424 /* Print normal ELF private data. */
425 _bfd_elf_print_private_bfd_data (abfd, ptr);
426
427 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
428
429 /* xgettext:c-format */
430 fprintf (file, _ ("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
431
432 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
433 fprintf (file, _ (" [cpu32]"));
434
435 fputc ('\n', file);
436
437 return true;
438 }
439 /* Look through the relocs for a section during the first phase, and
440 allocate space in the global offset table or procedure linkage
441 table. */
442
443 static boolean
444 elf_m68k_check_relocs (abfd, info, sec, relocs)
445 bfd *abfd;
446 struct bfd_link_info *info;
447 asection *sec;
448 const Elf_Internal_Rela *relocs;
449 {
450 bfd *dynobj;
451 Elf_Internal_Shdr *symtab_hdr;
452 struct elf_link_hash_entry **sym_hashes;
453 bfd_signed_vma *local_got_refcounts;
454 const Elf_Internal_Rela *rel;
455 const Elf_Internal_Rela *rel_end;
456 asection *sgot;
457 asection *srelgot;
458 asection *sreloc;
459
460 if (info->relocateable)
461 return true;
462
463 dynobj = elf_hash_table (info)->dynobj;
464 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
465 sym_hashes = elf_sym_hashes (abfd);
466 local_got_refcounts = elf_local_got_refcounts (abfd);
467
468 sgot = NULL;
469 srelgot = NULL;
470 sreloc = NULL;
471
472 rel_end = relocs + sec->reloc_count;
473 for (rel = relocs; rel < rel_end; rel++)
474 {
475 unsigned long r_symndx;
476 struct elf_link_hash_entry *h;
477
478 r_symndx = ELF32_R_SYM (rel->r_info);
479
480 if (r_symndx < symtab_hdr->sh_info)
481 h = NULL;
482 else
483 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
484
485 switch (ELF32_R_TYPE (rel->r_info))
486 {
487 case R_68K_GOT8:
488 case R_68K_GOT16:
489 case R_68K_GOT32:
490 if (h != NULL
491 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
492 break;
493 /* Fall through. */
494 case R_68K_GOT8O:
495 case R_68K_GOT16O:
496 case R_68K_GOT32O:
497 /* This symbol requires a global offset table entry. */
498
499 if (dynobj == NULL)
500 {
501 /* Create the .got section. */
502 elf_hash_table (info)->dynobj = dynobj = abfd;
503 if (!_bfd_elf_create_got_section (dynobj, info))
504 return false;
505 }
506
507 if (sgot == NULL)
508 {
509 sgot = bfd_get_section_by_name (dynobj, ".got");
510 BFD_ASSERT (sgot != NULL);
511 }
512
513 if (srelgot == NULL
514 && (h != NULL || info->shared))
515 {
516 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
517 if (srelgot == NULL)
518 {
519 srelgot = bfd_make_section (dynobj, ".rela.got");
520 if (srelgot == NULL
521 || !bfd_set_section_flags (dynobj, srelgot,
522 (SEC_ALLOC
523 | SEC_LOAD
524 | SEC_HAS_CONTENTS
525 | SEC_IN_MEMORY
526 | SEC_LINKER_CREATED
527 | SEC_READONLY))
528 || !bfd_set_section_alignment (dynobj, srelgot, 2))
529 return false;
530 }
531 }
532
533 if (h != NULL)
534 {
535 if (h->got.refcount == -1)
536 {
537 h->got.refcount = 1;
538
539 /* Make sure this symbol is output as a dynamic symbol. */
540 if (h->dynindx == -1)
541 {
542 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
543 return false;
544 }
545
546 /* Allocate space in the .got section. */
547 sgot->_raw_size += 4;
548 /* Allocate relocation space. */
549 srelgot->_raw_size += sizeof (Elf32_External_Rela);
550 }
551 else
552 h->got.refcount++;
553 }
554 else
555 {
556 /* This is a global offset table entry for a local symbol. */
557 if (local_got_refcounts == NULL)
558 {
559 size_t size;
560
561 size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
562 local_got_refcounts = ((bfd_signed_vma *)
563 bfd_alloc (abfd, size));
564 if (local_got_refcounts == NULL)
565 return false;
566 elf_local_got_refcounts (abfd) = local_got_refcounts;
567 memset (local_got_refcounts, -1, size);
568 }
569 if (local_got_refcounts[r_symndx] == -1)
570 {
571 local_got_refcounts[r_symndx] = 1;
572
573 sgot->_raw_size += 4;
574 if (info->shared)
575 {
576 /* If we are generating a shared object, we need to
577 output a R_68K_RELATIVE reloc so that the dynamic
578 linker can adjust this GOT entry. */
579 srelgot->_raw_size += sizeof (Elf32_External_Rela);
580 }
581 }
582 else
583 local_got_refcounts[r_symndx]++;
584 }
585 break;
586
587 case R_68K_PLT8:
588 case R_68K_PLT16:
589 case R_68K_PLT32:
590 /* This symbol requires a procedure linkage table entry. We
591 actually build the entry in adjust_dynamic_symbol,
592 because this might be a case of linking PIC code which is
593 never referenced by a dynamic object, in which case we
594 don't need to generate a procedure linkage table entry
595 after all. */
596
597 /* If this is a local symbol, we resolve it directly without
598 creating a procedure linkage table entry. */
599 if (h == NULL)
600 continue;
601
602 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
603 if (h->plt.refcount == -1)
604 h->plt.refcount = 1;
605 else
606 h->plt.refcount++;
607 break;
608
609 case R_68K_PLT8O:
610 case R_68K_PLT16O:
611 case R_68K_PLT32O:
612 /* This symbol requires a procedure linkage table entry. */
613
614 if (h == NULL)
615 {
616 /* It does not make sense to have this relocation for a
617 local symbol. FIXME: does it? How to handle it if
618 it does make sense? */
619 bfd_set_error (bfd_error_bad_value);
620 return false;
621 }
622
623 /* Make sure this symbol is output as a dynamic symbol. */
624 if (h->dynindx == -1)
625 {
626 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
627 return false;
628 }
629
630 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
631 if (h->plt.refcount == -1)
632 h->plt.refcount = 1;
633 else
634 h->plt.refcount++;
635 break;
636
637 case R_68K_PC8:
638 case R_68K_PC16:
639 case R_68K_PC32:
640 /* If we are creating a shared library and this is not a local
641 symbol, we need to copy the reloc into the shared library.
642 However when linking with -Bsymbolic and this is a global
643 symbol which is defined in an object we are including in the
644 link (i.e., DEF_REGULAR is set), then we can resolve the
645 reloc directly. At this point we have not seen all the input
646 files, so it is possible that DEF_REGULAR is not set now but
647 will be set later (it is never cleared). We account for that
648 possibility below by storing information in the
649 pcrel_relocs_copied field of the hash table entry. */
650 if (!(info->shared
651 && (sec->flags & SEC_ALLOC) != 0
652 && h != NULL
653 && (!info->symbolic
654 || (h->elf_link_hash_flags
655 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
656 {
657 if (h != NULL)
658 {
659 /* Make sure a plt entry is created for this symbol if
660 it turns out to be a function defined by a dynamic
661 object. */
662 if (h->plt.refcount == -1)
663 h->plt.refcount = 1;
664 else
665 h->plt.refcount++;
666 }
667 break;
668 }
669 /* Fall through. */
670 case R_68K_8:
671 case R_68K_16:
672 case R_68K_32:
673 if (h != NULL)
674 {
675 /* Make sure a plt entry is created for this symbol if it
676 turns out to be a function defined by a dynamic object. */
677 if (h->plt.refcount == -1)
678 h->plt.refcount = 1;
679 else
680 h->plt.refcount++;
681 }
682
683 /* If we are creating a shared library, we need to copy the
684 reloc into the shared library. */
685 if (info->shared
686 && (sec->flags & SEC_ALLOC) != 0)
687 {
688 /* When creating a shared object, we must copy these
689 reloc types into the output file. We create a reloc
690 section in dynobj and make room for this reloc. */
691 if (sreloc == NULL)
692 {
693 const char *name;
694
695 name = (bfd_elf_string_from_elf_section
696 (abfd,
697 elf_elfheader (abfd)->e_shstrndx,
698 elf_section_data (sec)->rel_hdr.sh_name));
699 if (name == NULL)
700 return false;
701
702 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
703 && strcmp (bfd_get_section_name (abfd, sec),
704 name + 5) == 0);
705
706 sreloc = bfd_get_section_by_name (dynobj, name);
707 if (sreloc == NULL)
708 {
709 sreloc = bfd_make_section (dynobj, name);
710 if (sreloc == NULL
711 || !bfd_set_section_flags (dynobj, sreloc,
712 (SEC_ALLOC
713 | SEC_LOAD
714 | SEC_HAS_CONTENTS
715 | SEC_IN_MEMORY
716 | SEC_LINKER_CREATED
717 | SEC_READONLY))
718 || !bfd_set_section_alignment (dynobj, sreloc, 2))
719 return false;
720 }
721 }
722
723 sreloc->_raw_size += sizeof (Elf32_External_Rela);
724
725 /* If we are linking with -Bsymbolic, we count the number of
726 PC relative relocations we have entered for this symbol,
727 so that we can discard them again if the symbol is later
728 defined by a regular object. Note that this function is
729 only called if we are using an m68kelf linker hash table,
730 which means that h is really a pointer to an
731 elf_m68k_link_hash_entry. */
732 if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8
733 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
734 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
735 && info->symbolic)
736 {
737 struct elf_m68k_link_hash_entry *eh;
738 struct elf_m68k_pcrel_relocs_copied *p;
739
740 eh = (struct elf_m68k_link_hash_entry *) h;
741
742 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
743 if (p->section == sreloc)
744 break;
745
746 if (p == NULL)
747 {
748 p = ((struct elf_m68k_pcrel_relocs_copied *)
749 bfd_alloc (dynobj, sizeof *p));
750 if (p == NULL)
751 return false;
752 p->next = eh->pcrel_relocs_copied;
753 eh->pcrel_relocs_copied = p;
754 p->section = sreloc;
755 p->count = 0;
756 }
757
758 ++p->count;
759 }
760 }
761
762 break;
763
764 /* This relocation describes the C++ object vtable hierarchy.
765 Reconstruct it for later use during GC. */
766 case R_68K_GNU_VTINHERIT:
767 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
768 return false;
769 break;
770
771 /* This relocation describes which C++ vtable entries are actually
772 used. Record for later use during GC. */
773 case R_68K_GNU_VTENTRY:
774 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
775 return false;
776 break;
777
778 default:
779 break;
780 }
781 }
782
783 return true;
784 }
785
786 /* Return the section that should be marked against GC for a given
787 relocation. */
788
789 static asection *
790 elf_m68k_gc_mark_hook (abfd, info, rel, h, sym)
791 bfd *abfd;
792 struct bfd_link_info *info ATTRIBUTE_UNUSED;
793 Elf_Internal_Rela *rel;
794 struct elf_link_hash_entry *h;
795 Elf_Internal_Sym *sym;
796 {
797 if (h != NULL)
798 {
799 switch (ELF32_R_TYPE (rel->r_info))
800 {
801 case R_68K_GNU_VTINHERIT:
802 case R_68K_GNU_VTENTRY:
803 break;
804
805 default:
806 switch (h->root.type)
807 {
808 default:
809 break;
810
811 case bfd_link_hash_defined:
812 case bfd_link_hash_defweak:
813 return h->root.u.def.section;
814
815 case bfd_link_hash_common:
816 return h->root.u.c.p->section;
817 }
818 }
819 }
820 else
821 {
822 if (!(elf_bad_symtab (abfd)
823 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
824 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
825 && sym->st_shndx != SHN_COMMON))
826 {
827 return bfd_section_from_elf_index (abfd, sym->st_shndx);
828 }
829 }
830
831 return NULL;
832 }
833
834 /* Update the got entry reference counts for the section being removed. */
835
836 static boolean
837 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
838 bfd *abfd;
839 struct bfd_link_info *info;
840 asection *sec;
841 const Elf_Internal_Rela *relocs;
842 {
843 Elf_Internal_Shdr *symtab_hdr;
844 struct elf_link_hash_entry **sym_hashes;
845 bfd_signed_vma *local_got_refcounts;
846 const Elf_Internal_Rela *rel, *relend;
847 unsigned long r_symndx;
848 struct elf_link_hash_entry *h;
849 bfd *dynobj;
850 asection *sgot;
851 asection *srelgot;
852
853 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
854 sym_hashes = elf_sym_hashes (abfd);
855 local_got_refcounts = elf_local_got_refcounts (abfd);
856
857 dynobj = elf_hash_table (info)->dynobj;
858 if (dynobj == NULL)
859 return true;
860
861 sgot = bfd_get_section_by_name (dynobj, ".got");
862 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
863
864 relend = relocs + sec->reloc_count;
865 for (rel = relocs; rel < relend; rel++)
866 {
867 switch (ELF32_R_TYPE (rel->r_info))
868 {
869 case R_68K_GOT8:
870 case R_68K_GOT16:
871 case R_68K_GOT32:
872 case R_68K_GOT8O:
873 case R_68K_GOT16O:
874 case R_68K_GOT32O:
875 r_symndx = ELF32_R_SYM (rel->r_info);
876 if (r_symndx >= symtab_hdr->sh_info)
877 {
878 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
879 if (h->got.refcount > 0)
880 {
881 --h->got.refcount;
882 if (h->got.refcount == 0)
883 {
884 /* We don't need the .got entry any more. */
885 sgot->_raw_size -= 4;
886 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
887 }
888 }
889 }
890 else if (local_got_refcounts != NULL)
891 {
892 if (local_got_refcounts[r_symndx] > 0)
893 {
894 --local_got_refcounts[r_symndx];
895 if (local_got_refcounts[r_symndx] == 0)
896 {
897 /* We don't need the .got entry any more. */
898 sgot->_raw_size -= 4;
899 if (info->shared)
900 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
901 }
902 }
903 }
904 break;
905
906 case R_68K_PLT8:
907 case R_68K_PLT16:
908 case R_68K_PLT32:
909 case R_68K_PLT8O:
910 case R_68K_PLT16O:
911 case R_68K_PLT32O:
912 case R_68K_PC8:
913 case R_68K_PC16:
914 case R_68K_PC32:
915 case R_68K_8:
916 case R_68K_16:
917 case R_68K_32:
918 r_symndx = ELF32_R_SYM (rel->r_info);
919 if (r_symndx >= symtab_hdr->sh_info)
920 {
921 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
922 if (h->plt.refcount > 0)
923 --h->plt.refcount;
924 }
925 break;
926
927 default:
928 break;
929 }
930 }
931
932 return true;
933 }
934
935
936 /* Adjust a symbol defined by a dynamic object and referenced by a
937 regular object. The current definition is in some section of the
938 dynamic object, but we're not including those sections. We have to
939 change the definition to something the rest of the link can
940 understand. */
941
942 static boolean
943 elf_m68k_adjust_dynamic_symbol (info, h)
944 struct bfd_link_info *info;
945 struct elf_link_hash_entry *h;
946 {
947 bfd *dynobj;
948 asection *s;
949 unsigned int power_of_two;
950
951 dynobj = elf_hash_table (info)->dynobj;
952
953 /* Make sure we know what is going on here. */
954 BFD_ASSERT (dynobj != NULL
955 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
956 || h->weakdef != NULL
957 || ((h->elf_link_hash_flags
958 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
959 && (h->elf_link_hash_flags
960 & ELF_LINK_HASH_REF_REGULAR) != 0
961 && (h->elf_link_hash_flags
962 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
963
964 /* If this is a function, put it in the procedure linkage table. We
965 will fill in the contents of the procedure linkage table later,
966 when we know the address of the .got section. */
967 if (h->type == STT_FUNC
968 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
969 {
970 if (! info->shared
971 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
972 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
973 /* We must always create the plt entry if it was referenced
974 by a PLTxxO relocation. In this case we already recorded
975 it as a dynamic symbol. */
976 && h->dynindx == -1)
977 {
978 /* This case can occur if we saw a PLTxx reloc in an input
979 file, but the symbol was never referred to by a dynamic
980 object. In such a case, we don't actually need to build
981 a procedure linkage table, and we can just do a PCxx
982 reloc instead. */
983 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
984 h->plt.offset = (bfd_vma) -1;
985 return true;
986 }
987
988 /* GC may have rendered this entry unused. */
989 if (h->plt.refcount <= 0)
990 {
991 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
992 h->plt.offset = (bfd_vma) -1;
993 return true;
994 }
995
996 /* Make sure this symbol is output as a dynamic symbol. */
997 if (h->dynindx == -1)
998 {
999 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1000 return false;
1001 }
1002
1003 s = bfd_get_section_by_name (dynobj, ".plt");
1004 BFD_ASSERT (s != NULL);
1005
1006 /* If this is the first .plt entry, make room for the special
1007 first entry. */
1008 if (s->_raw_size == 0)
1009 {
1010 if (CPU32_FLAG (dynobj))
1011 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1012 else
1013 s->_raw_size += PLT_ENTRY_SIZE;
1014 }
1015
1016 /* If this symbol is not defined in a regular file, and we are
1017 not generating a shared library, then set the symbol to this
1018 location in the .plt. This is required to make function
1019 pointers compare as equal between the normal executable and
1020 the shared library. */
1021 if (!info->shared
1022 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1023 {
1024 h->root.u.def.section = s;
1025 h->root.u.def.value = s->_raw_size;
1026 }
1027
1028 h->plt.offset = s->_raw_size;
1029
1030 /* Make room for this entry. */
1031 if (CPU32_FLAG (dynobj))
1032 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1033 else
1034 s->_raw_size += PLT_ENTRY_SIZE;
1035
1036 /* We also need to make an entry in the .got.plt section, which
1037 will be placed in the .got section by the linker script. */
1038
1039 s = bfd_get_section_by_name (dynobj, ".got.plt");
1040 BFD_ASSERT (s != NULL);
1041 s->_raw_size += 4;
1042
1043 /* We also need to make an entry in the .rela.plt section. */
1044
1045 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1046 BFD_ASSERT (s != NULL);
1047 s->_raw_size += sizeof (Elf32_External_Rela);
1048
1049 return true;
1050 }
1051
1052 /* Reinitialize the plt offset now that it is not used as a reference
1053 count any more. */
1054 h->plt.offset = (bfd_vma) -1;
1055
1056 /* If this is a weak symbol, and there is a real definition, the
1057 processor independent code will have arranged for us to see the
1058 real definition first, and we can just use the same value. */
1059 if (h->weakdef != NULL)
1060 {
1061 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1062 || h->weakdef->root.type == bfd_link_hash_defweak);
1063 h->root.u.def.section = h->weakdef->root.u.def.section;
1064 h->root.u.def.value = h->weakdef->root.u.def.value;
1065 return true;
1066 }
1067
1068 /* This is a reference to a symbol defined by a dynamic object which
1069 is not a function. */
1070
1071 /* If we are creating a shared library, we must presume that the
1072 only references to the symbol are via the global offset table.
1073 For such cases we need not do anything here; the relocations will
1074 be handled correctly by relocate_section. */
1075 if (info->shared)
1076 return true;
1077
1078 /* We must allocate the symbol in our .dynbss section, which will
1079 become part of the .bss section of the executable. There will be
1080 an entry for this symbol in the .dynsym section. The dynamic
1081 object will contain position independent code, so all references
1082 from the dynamic object to this symbol will go through the global
1083 offset table. The dynamic linker will use the .dynsym entry to
1084 determine the address it must put in the global offset table, so
1085 both the dynamic object and the regular object will refer to the
1086 same memory location for the variable. */
1087
1088 s = bfd_get_section_by_name (dynobj, ".dynbss");
1089 BFD_ASSERT (s != NULL);
1090
1091 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1092 copy the initial value out of the dynamic object and into the
1093 runtime process image. We need to remember the offset into the
1094 .rela.bss section we are going to use. */
1095 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1096 {
1097 asection *srel;
1098
1099 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1100 BFD_ASSERT (srel != NULL);
1101 srel->_raw_size += sizeof (Elf32_External_Rela);
1102 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1103 }
1104
1105 /* We need to figure out the alignment required for this symbol. I
1106 have no idea how ELF linkers handle this. */
1107 power_of_two = bfd_log2 (h->size);
1108 if (power_of_two > 3)
1109 power_of_two = 3;
1110
1111 /* Apply the required alignment. */
1112 s->_raw_size = BFD_ALIGN (s->_raw_size,
1113 (bfd_size_type) (1 << power_of_two));
1114 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1115 {
1116 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1117 return false;
1118 }
1119
1120 /* Define the symbol as being at this point in the section. */
1121 h->root.u.def.section = s;
1122 h->root.u.def.value = s->_raw_size;
1123
1124 /* Increment the section size to make room for the symbol. */
1125 s->_raw_size += h->size;
1126
1127 return true;
1128 }
1129
1130 /* Set the sizes of the dynamic sections. */
1131
1132 static boolean
1133 elf_m68k_size_dynamic_sections (output_bfd, info)
1134 bfd *output_bfd;
1135 struct bfd_link_info *info;
1136 {
1137 bfd *dynobj;
1138 asection *s;
1139 boolean plt;
1140 boolean relocs;
1141 boolean reltext;
1142
1143 dynobj = elf_hash_table (info)->dynobj;
1144 BFD_ASSERT (dynobj != NULL);
1145
1146 if (elf_hash_table (info)->dynamic_sections_created)
1147 {
1148 /* Set the contents of the .interp section to the interpreter. */
1149 if (!info->shared)
1150 {
1151 s = bfd_get_section_by_name (dynobj, ".interp");
1152 BFD_ASSERT (s != NULL);
1153 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1154 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1155 }
1156 }
1157 else
1158 {
1159 /* We may have created entries in the .rela.got section.
1160 However, if we are not creating the dynamic sections, we will
1161 not actually use these entries. Reset the size of .rela.got,
1162 which will cause it to get stripped from the output file
1163 below. */
1164 s = bfd_get_section_by_name (dynobj, ".rela.got");
1165 if (s != NULL)
1166 s->_raw_size = 0;
1167 }
1168
1169 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1170 relative relocs against symbols defined in a regular object. We
1171 allocated space for them in the check_relocs routine, but we will not
1172 fill them in in the relocate_section routine. */
1173 if (info->shared && info->symbolic)
1174 elf_m68k_link_hash_traverse (elf_m68k_hash_table (info),
1175 elf_m68k_discard_copies,
1176 (PTR) NULL);
1177
1178 /* The check_relocs and adjust_dynamic_symbol entry points have
1179 determined the sizes of the various dynamic sections. Allocate
1180 memory for them. */
1181 plt = false;
1182 relocs = false;
1183 reltext = false;
1184 for (s = dynobj->sections; s != NULL; s = s->next)
1185 {
1186 const char *name;
1187 boolean strip;
1188
1189 if ((s->flags & SEC_LINKER_CREATED) == 0)
1190 continue;
1191
1192 /* It's OK to base decisions on the section name, because none
1193 of the dynobj section names depend upon the input files. */
1194 name = bfd_get_section_name (dynobj, s);
1195
1196 strip = false;
1197
1198 if (strcmp (name, ".plt") == 0)
1199 {
1200 if (s->_raw_size == 0)
1201 {
1202 /* Strip this section if we don't need it; see the
1203 comment below. */
1204 strip = true;
1205 }
1206 else
1207 {
1208 /* Remember whether there is a PLT. */
1209 plt = true;
1210 }
1211 }
1212 else if (strncmp (name, ".rela", 5) == 0)
1213 {
1214 if (s->_raw_size == 0)
1215 {
1216 /* If we don't need this section, strip it from the
1217 output file. This is mostly to handle .rela.bss and
1218 .rela.plt. We must create both sections in
1219 create_dynamic_sections, because they must be created
1220 before the linker maps input sections to output
1221 sections. The linker does that before
1222 adjust_dynamic_symbol is called, and it is that
1223 function which decides whether anything needs to go
1224 into these sections. */
1225 strip = true;
1226 }
1227 else
1228 {
1229 asection *target;
1230
1231 /* Remember whether there are any reloc sections other
1232 than .rela.plt. */
1233 if (strcmp (name, ".rela.plt") != 0)
1234 {
1235 const char *outname;
1236
1237 relocs = true;
1238
1239 /* If this relocation section applies to a read only
1240 section, then we probably need a DT_TEXTREL
1241 entry. .rela.plt is actually associated with
1242 .got.plt, which is never readonly. */
1243 outname = bfd_get_section_name (output_bfd,
1244 s->output_section);
1245 target = bfd_get_section_by_name (output_bfd, outname + 5);
1246 if (target != NULL
1247 && (target->flags & SEC_READONLY) != 0
1248 && (target->flags & SEC_ALLOC) != 0)
1249 reltext = true;
1250 }
1251
1252 /* We use the reloc_count field as a counter if we need
1253 to copy relocs into the output file. */
1254 s->reloc_count = 0;
1255 }
1256 }
1257 else if (strncmp (name, ".got", 4) != 0)
1258 {
1259 /* It's not one of our sections, so don't allocate space. */
1260 continue;
1261 }
1262
1263 if (strip)
1264 {
1265 _bfd_strip_section_from_output (info, s);
1266 continue;
1267 }
1268
1269 /* Allocate memory for the section contents. */
1270 s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size);
1271 if (s->contents == NULL && s->_raw_size != 0)
1272 return false;
1273 }
1274
1275 if (elf_hash_table (info)->dynamic_sections_created)
1276 {
1277 /* Add some entries to the .dynamic section. We fill in the
1278 values later, in elf_m68k_finish_dynamic_sections, but we
1279 must add the entries now so that we get the correct size for
1280 the .dynamic section. The DT_DEBUG entry is filled in by the
1281 dynamic linker and used by the debugger. */
1282 if (!info->shared)
1283 {
1284 if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
1285 return false;
1286 }
1287
1288 if (plt)
1289 {
1290 if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
1291 || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
1292 || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
1293 || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
1294 return false;
1295 }
1296
1297 if (relocs)
1298 {
1299 if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
1300 || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
1301 || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
1302 sizeof (Elf32_External_Rela)))
1303 return false;
1304 }
1305
1306 if (reltext)
1307 {
1308 if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
1309 return false;
1310 }
1311 }
1312
1313 return true;
1314 }
1315
1316 /* This function is called via elf_m68k_link_hash_traverse if we are
1317 creating a shared object with -Bsymbolic. It discards the space
1318 allocated to copy PC relative relocs against symbols which are defined
1319 in regular objects. We allocated space for them in the check_relocs
1320 routine, but we won't fill them in in the relocate_section routine. */
1321
1322 /*ARGSUSED*/
1323 static boolean
1324 elf_m68k_discard_copies (h, ignore)
1325 struct elf_m68k_link_hash_entry *h;
1326 PTR ignore ATTRIBUTE_UNUSED;
1327 {
1328 struct elf_m68k_pcrel_relocs_copied *s;
1329
1330 /* We only discard relocs for symbols defined in a regular object. */
1331 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1332 return true;
1333
1334 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1335 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1336
1337 return true;
1338 }
1339
1340 /* Relocate an M68K ELF section. */
1341
1342 static boolean
1343 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1344 contents, relocs, local_syms, local_sections)
1345 bfd *output_bfd;
1346 struct bfd_link_info *info;
1347 bfd *input_bfd;
1348 asection *input_section;
1349 bfd_byte *contents;
1350 Elf_Internal_Rela *relocs;
1351 Elf_Internal_Sym *local_syms;
1352 asection **local_sections;
1353 {
1354 bfd *dynobj;
1355 Elf_Internal_Shdr *symtab_hdr;
1356 struct elf_link_hash_entry **sym_hashes;
1357 bfd_vma *local_got_offsets;
1358 asection *sgot;
1359 asection *splt;
1360 asection *sreloc;
1361 Elf_Internal_Rela *rel;
1362 Elf_Internal_Rela *relend;
1363
1364 dynobj = elf_hash_table (info)->dynobj;
1365 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1366 sym_hashes = elf_sym_hashes (input_bfd);
1367 local_got_offsets = elf_local_got_offsets (input_bfd);
1368
1369 sgot = NULL;
1370 splt = NULL;
1371 sreloc = NULL;
1372
1373 rel = relocs;
1374 relend = relocs + input_section->reloc_count;
1375 for (; rel < relend; rel++)
1376 {
1377 int r_type;
1378 reloc_howto_type *howto;
1379 unsigned long r_symndx;
1380 struct elf_link_hash_entry *h;
1381 Elf_Internal_Sym *sym;
1382 asection *sec;
1383 bfd_vma relocation;
1384 bfd_reloc_status_type r;
1385
1386 r_type = ELF32_R_TYPE (rel->r_info);
1387 if (r_type < 0 || r_type >= (int) R_68K_max)
1388 {
1389 bfd_set_error (bfd_error_bad_value);
1390 return false;
1391 }
1392 howto = howto_table + r_type;
1393
1394 r_symndx = ELF32_R_SYM (rel->r_info);
1395
1396 if (info->relocateable)
1397 {
1398 /* This is a relocateable link. We don't have to change
1399 anything, unless the reloc is against a section symbol,
1400 in which case we have to adjust according to where the
1401 section symbol winds up in the output section. */
1402 if (r_symndx < symtab_hdr->sh_info)
1403 {
1404 sym = local_syms + r_symndx;
1405 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1406 {
1407 sec = local_sections[r_symndx];
1408 rel->r_addend += sec->output_offset + sym->st_value;
1409 }
1410 }
1411
1412 continue;
1413 }
1414
1415 /* This is a final link. */
1416 h = NULL;
1417 sym = NULL;
1418 sec = NULL;
1419 if (r_symndx < symtab_hdr->sh_info)
1420 {
1421 sym = local_syms + r_symndx;
1422 sec = local_sections[r_symndx];
1423 relocation = (sec->output_section->vma
1424 + sec->output_offset
1425 + sym->st_value);
1426 }
1427 else
1428 {
1429 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1430 while (h->root.type == bfd_link_hash_indirect
1431 || h->root.type == bfd_link_hash_warning)
1432 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1433 if (h->root.type == bfd_link_hash_defined
1434 || h->root.type == bfd_link_hash_defweak)
1435 {
1436 sec = h->root.u.def.section;
1437 if (((r_type == R_68K_PLT8
1438 || r_type == R_68K_PLT16
1439 || r_type == R_68K_PLT32
1440 || r_type == R_68K_PLT8O
1441 || r_type == R_68K_PLT16O
1442 || r_type == R_68K_PLT32O)
1443 && h->plt.offset != (bfd_vma) -1
1444 && elf_hash_table (info)->dynamic_sections_created)
1445 || ((r_type == R_68K_GOT8O
1446 || r_type == R_68K_GOT16O
1447 || r_type == R_68K_GOT32O
1448 || ((r_type == R_68K_GOT8
1449 || r_type == R_68K_GOT16
1450 || r_type == R_68K_GOT32)
1451 && strcmp (h->root.root.string,
1452 "_GLOBAL_OFFSET_TABLE_") != 0))
1453 && elf_hash_table (info)->dynamic_sections_created
1454 && (! info->shared
1455 || (! info->symbolic && h->dynindx != -1)
1456 || (h->elf_link_hash_flags
1457 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1458 || (info->shared
1459 && ((! info->symbolic && h->dynindx != -1)
1460 || (h->elf_link_hash_flags
1461 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1462 && (input_section->flags & SEC_ALLOC) != 0
1463 && (r_type == R_68K_8
1464 || r_type == R_68K_16
1465 || r_type == R_68K_32
1466 || r_type == R_68K_PC8
1467 || r_type == R_68K_PC16
1468 || r_type == R_68K_PC32)))
1469 {
1470 /* In these cases, we don't need the relocation
1471 value. We check specially because in some
1472 obscure cases sec->output_section will be NULL. */
1473 relocation = 0;
1474 }
1475 else
1476 relocation = (h->root.u.def.value
1477 + sec->output_section->vma
1478 + sec->output_offset);
1479 }
1480 else if (h->root.type == bfd_link_hash_undefweak)
1481 relocation = 0;
1482 else if (info->shared && !info->symbolic
1483 && !info->no_undefined
1484 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1485 relocation = 0;
1486 else
1487 {
1488 if (!(info->callbacks->undefined_symbol
1489 (info, h->root.root.string, input_bfd,
1490 input_section, rel->r_offset,
1491 (!info->shared || info->no_undefined
1492 || ELF_ST_VISIBILITY (h->other)))))
1493 return false;
1494 relocation = 0;
1495 }
1496 }
1497
1498 switch (r_type)
1499 {
1500 case R_68K_GOT8:
1501 case R_68K_GOT16:
1502 case R_68K_GOT32:
1503 /* Relocation is to the address of the entry for this symbol
1504 in the global offset table. */
1505 if (h != NULL
1506 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1507 break;
1508 /* Fall through. */
1509 case R_68K_GOT8O:
1510 case R_68K_GOT16O:
1511 case R_68K_GOT32O:
1512 /* Relocation is the offset of the entry for this symbol in
1513 the global offset table. */
1514
1515 {
1516 bfd_vma off;
1517
1518 if (sgot == NULL)
1519 {
1520 sgot = bfd_get_section_by_name (dynobj, ".got");
1521 BFD_ASSERT (sgot != NULL);
1522 }
1523
1524 if (h != NULL)
1525 {
1526 off = h->got.offset;
1527 BFD_ASSERT (off != (bfd_vma) -1);
1528
1529 if (!elf_hash_table (info)->dynamic_sections_created
1530 || (info->shared
1531 && (info->symbolic || h->dynindx == -1)
1532 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1533 {
1534 /* This is actually a static link, or it is a
1535 -Bsymbolic link and the symbol is defined
1536 locally, or the symbol was forced to be local
1537 because of a version file.. We must initialize
1538 this entry in the global offset table. Since
1539 the offset must always be a multiple of 4, we
1540 use the least significant bit to record whether
1541 we have initialized it already.
1542
1543 When doing a dynamic link, we create a .rela.got
1544 relocation entry to initialize the value. This
1545 is done in the finish_dynamic_symbol routine. */
1546 if ((off & 1) != 0)
1547 off &= ~1;
1548 else
1549 {
1550 bfd_put_32 (output_bfd, relocation,
1551 sgot->contents + off);
1552 h->got.offset |= 1;
1553 }
1554 }
1555 }
1556 else
1557 {
1558 BFD_ASSERT (local_got_offsets != NULL
1559 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1560
1561 off = local_got_offsets[r_symndx];
1562
1563 /* The offset must always be a multiple of 4. We use
1564 the least significant bit to record whether we have
1565 already generated the necessary reloc. */
1566 if ((off & 1) != 0)
1567 off &= ~1;
1568 else
1569 {
1570 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1571
1572 if (info->shared)
1573 {
1574 asection *srelgot;
1575 Elf_Internal_Rela outrel;
1576
1577 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1578 BFD_ASSERT (srelgot != NULL);
1579
1580 outrel.r_offset = (sgot->output_section->vma
1581 + sgot->output_offset
1582 + off);
1583 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1584 outrel.r_addend = relocation;
1585 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1586 (((Elf32_External_Rela *)
1587 srelgot->contents)
1588 + srelgot->reloc_count));
1589 ++srelgot->reloc_count;
1590 }
1591
1592 local_got_offsets[r_symndx] |= 1;
1593 }
1594 }
1595
1596 relocation = sgot->output_offset + off;
1597 if (r_type == R_68K_GOT8O
1598 || r_type == R_68K_GOT16O
1599 || r_type == R_68K_GOT32O)
1600 {
1601 /* This relocation does not use the addend. */
1602 rel->r_addend = 0;
1603 }
1604 else
1605 relocation += sgot->output_section->vma;
1606 }
1607 break;
1608
1609 case R_68K_PLT8:
1610 case R_68K_PLT16:
1611 case R_68K_PLT32:
1612 /* Relocation is to the entry for this symbol in the
1613 procedure linkage table. */
1614
1615 /* Resolve a PLTxx reloc against a local symbol directly,
1616 without using the procedure linkage table. */
1617 if (h == NULL)
1618 break;
1619
1620 if (h->plt.offset == (bfd_vma) -1
1621 || !elf_hash_table (info)->dynamic_sections_created)
1622 {
1623 /* We didn't make a PLT entry for this symbol. This
1624 happens when statically linking PIC code, or when
1625 using -Bsymbolic. */
1626 break;
1627 }
1628
1629 if (splt == NULL)
1630 {
1631 splt = bfd_get_section_by_name (dynobj, ".plt");
1632 BFD_ASSERT (splt != NULL);
1633 }
1634
1635 relocation = (splt->output_section->vma
1636 + splt->output_offset
1637 + h->plt.offset);
1638 break;
1639
1640 case R_68K_PLT8O:
1641 case R_68K_PLT16O:
1642 case R_68K_PLT32O:
1643 /* Relocation is the offset of the entry for this symbol in
1644 the procedure linkage table. */
1645 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1646
1647 if (splt == NULL)
1648 {
1649 splt = bfd_get_section_by_name (dynobj, ".plt");
1650 BFD_ASSERT (splt != NULL);
1651 }
1652
1653 relocation = h->plt.offset;
1654
1655 /* This relocation does not use the addend. */
1656 rel->r_addend = 0;
1657
1658 break;
1659
1660 case R_68K_PC8:
1661 case R_68K_PC16:
1662 case R_68K_PC32:
1663 if (h == NULL)
1664 break;
1665 /* Fall through. */
1666 case R_68K_8:
1667 case R_68K_16:
1668 case R_68K_32:
1669 if (info->shared
1670 && (input_section->flags & SEC_ALLOC) != 0
1671 && ((r_type != R_68K_PC8
1672 && r_type != R_68K_PC16
1673 && r_type != R_68K_PC32)
1674 || (!info->symbolic
1675 || (h->elf_link_hash_flags
1676 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1677 {
1678 Elf_Internal_Rela outrel;
1679 boolean skip, relocate;
1680
1681 /* When generating a shared object, these relocations
1682 are copied into the output file to be resolved at run
1683 time. */
1684
1685 if (sreloc == NULL)
1686 {
1687 const char *name;
1688
1689 name = (bfd_elf_string_from_elf_section
1690 (input_bfd,
1691 elf_elfheader (input_bfd)->e_shstrndx,
1692 elf_section_data (input_section)->rel_hdr.sh_name));
1693 if (name == NULL)
1694 return false;
1695
1696 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1697 && strcmp (bfd_get_section_name (input_bfd,
1698 input_section),
1699 name + 5) == 0);
1700
1701 sreloc = bfd_get_section_by_name (dynobj, name);
1702 BFD_ASSERT (sreloc != NULL);
1703 }
1704
1705 skip = false;
1706
1707 if (elf_section_data (input_section)->stab_info == NULL)
1708 outrel.r_offset = rel->r_offset;
1709 else
1710 {
1711 bfd_vma off;
1712
1713 off = (_bfd_stab_section_offset
1714 (output_bfd, &elf_hash_table (info)->stab_info,
1715 input_section,
1716 &elf_section_data (input_section)->stab_info,
1717 rel->r_offset));
1718 if (off == (bfd_vma) -1)
1719 skip = true;
1720 outrel.r_offset = off;
1721 }
1722
1723 outrel.r_offset += (input_section->output_section->vma
1724 + input_section->output_offset);
1725
1726 if (skip)
1727 {
1728 memset (&outrel, 0, sizeof outrel);
1729 relocate = false;
1730 }
1731 /* h->dynindx may be -1 if the symbol was marked to
1732 become local. */
1733 else if (h != NULL
1734 && ((! info->symbolic && h->dynindx != -1)
1735 || (h->elf_link_hash_flags
1736 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1737 {
1738 BFD_ASSERT (h->dynindx != -1);
1739 relocate = false;
1740 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1741 outrel.r_addend = relocation + rel->r_addend;
1742 }
1743 else
1744 {
1745 if (r_type == R_68K_32)
1746 {
1747 relocate = true;
1748 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1749 outrel.r_addend = relocation + rel->r_addend;
1750 }
1751 else
1752 {
1753 long indx;
1754
1755 if (h == NULL)
1756 sec = local_sections[r_symndx];
1757 else
1758 {
1759 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1760 || (h->root.type
1761 == bfd_link_hash_defweak));
1762 sec = h->root.u.def.section;
1763 }
1764 if (sec != NULL && bfd_is_abs_section (sec))
1765 indx = 0;
1766 else if (sec == NULL || sec->owner == NULL)
1767 {
1768 bfd_set_error (bfd_error_bad_value);
1769 return false;
1770 }
1771 else
1772 {
1773 asection *osec;
1774
1775 osec = sec->output_section;
1776 indx = elf_section_data (osec)->dynindx;
1777 BFD_ASSERT (indx > 0);
1778 }
1779
1780 relocate = false;
1781 outrel.r_info = ELF32_R_INFO (indx, r_type);
1782 outrel.r_addend = relocation + rel->r_addend;
1783 }
1784 }
1785
1786 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1787 (((Elf32_External_Rela *)
1788 sreloc->contents)
1789 + sreloc->reloc_count));
1790 ++sreloc->reloc_count;
1791
1792 /* This reloc will be computed at runtime, so there's no
1793 need to do anything now, except for R_68K_32
1794 relocations that have been turned into
1795 R_68K_RELATIVE. */
1796 if (!relocate)
1797 continue;
1798 }
1799
1800 break;
1801
1802 case R_68K_GNU_VTINHERIT:
1803 case R_68K_GNU_VTENTRY:
1804 /* These are no-ops in the end. */
1805 continue;
1806
1807 default:
1808 break;
1809 }
1810
1811 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1812 contents, rel->r_offset,
1813 relocation, rel->r_addend);
1814
1815 if (r != bfd_reloc_ok)
1816 {
1817 switch (r)
1818 {
1819 default:
1820 case bfd_reloc_outofrange:
1821 abort ();
1822 case bfd_reloc_overflow:
1823 {
1824 const char *name;
1825
1826 if (h != NULL)
1827 name = h->root.root.string;
1828 else
1829 {
1830 name = bfd_elf_string_from_elf_section (input_bfd,
1831 symtab_hdr->sh_link,
1832 sym->st_name);
1833 if (name == NULL)
1834 return false;
1835 if (*name == '\0')
1836 name = bfd_section_name (input_bfd, sec);
1837 }
1838 if (!(info->callbacks->reloc_overflow
1839 (info, name, howto->name, (bfd_vma) 0,
1840 input_bfd, input_section, rel->r_offset)))
1841 return false;
1842 }
1843 break;
1844 }
1845 }
1846 }
1847
1848 return true;
1849 }
1850
1851 /* Finish up dynamic symbol handling. We set the contents of various
1852 dynamic sections here. */
1853
1854 static boolean
1855 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1856 bfd *output_bfd;
1857 struct bfd_link_info *info;
1858 struct elf_link_hash_entry *h;
1859 Elf_Internal_Sym *sym;
1860 {
1861 bfd *dynobj;
1862 int plt_off1, plt_off2, plt_off3;
1863
1864 dynobj = elf_hash_table (info)->dynobj;
1865
1866 if (h->plt.offset != (bfd_vma) -1)
1867 {
1868 asection *splt;
1869 asection *sgot;
1870 asection *srela;
1871 bfd_vma plt_index;
1872 bfd_vma got_offset;
1873 Elf_Internal_Rela rela;
1874
1875 /* This symbol has an entry in the procedure linkage table. Set
1876 it up. */
1877
1878 BFD_ASSERT (h->dynindx != -1);
1879
1880 splt = bfd_get_section_by_name (dynobj, ".plt");
1881 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1882 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1883 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1884
1885 /* Get the index in the procedure linkage table which
1886 corresponds to this symbol. This is the index of this symbol
1887 in all the symbols for which we are making plt entries. The
1888 first entry in the procedure linkage table is reserved. */
1889 if ( CPU32_FLAG (output_bfd))
1890 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1891 else
1892 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1893
1894 /* Get the offset into the .got table of the entry that
1895 corresponds to this function. Each .got entry is 4 bytes.
1896 The first three are reserved. */
1897 got_offset = (plt_index + 3) * 4;
1898
1899 if ( CPU32_FLAG (output_bfd))
1900 {
1901 /* Fill in the entry in the procedure linkage table. */
1902 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1903 PLT_CPU32_ENTRY_SIZE);
1904 plt_off1 = 4;
1905 plt_off2 = 12;
1906 plt_off3 = 18;
1907 }
1908 else
1909 {
1910 /* Fill in the entry in the procedure linkage table. */
1911 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1912 PLT_ENTRY_SIZE);
1913 plt_off1 = 4;
1914 plt_off2 = 10;
1915 plt_off3 = 16;
1916 }
1917
1918 /* The offset is relative to the first extension word. */
1919 bfd_put_32 (output_bfd,
1920 (sgot->output_section->vma
1921 + sgot->output_offset
1922 + got_offset
1923 - (splt->output_section->vma
1924 + h->plt.offset + 2)),
1925 splt->contents + h->plt.offset + plt_off1);
1926
1927 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1928 splt->contents + h->plt.offset + plt_off2);
1929 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1930 splt->contents + h->plt.offset + plt_off3);
1931
1932 /* Fill in the entry in the global offset table. */
1933 bfd_put_32 (output_bfd,
1934 (splt->output_section->vma
1935 + splt->output_offset
1936 + h->plt.offset
1937 + 8),
1938 sgot->contents + got_offset);
1939
1940 /* Fill in the entry in the .rela.plt section. */
1941 rela.r_offset = (sgot->output_section->vma
1942 + sgot->output_offset
1943 + got_offset);
1944 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1945 rela.r_addend = 0;
1946 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1947 ((Elf32_External_Rela *) srela->contents
1948 + plt_index));
1949
1950 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1951 {
1952 /* Mark the symbol as undefined, rather than as defined in
1953 the .plt section. Leave the value alone. */
1954 sym->st_shndx = SHN_UNDEF;
1955 }
1956 }
1957
1958 if (h->got.offset != (bfd_vma) -1)
1959 {
1960 asection *sgot;
1961 asection *srela;
1962 Elf_Internal_Rela rela;
1963
1964 /* This symbol has an entry in the global offset table. Set it
1965 up. */
1966
1967 sgot = bfd_get_section_by_name (dynobj, ".got");
1968 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1969 BFD_ASSERT (sgot != NULL && srela != NULL);
1970
1971 rela.r_offset = (sgot->output_section->vma
1972 + sgot->output_offset
1973 + (h->got.offset &~ 1));
1974
1975 /* If this is a -Bsymbolic link, and the symbol is defined
1976 locally, we just want to emit a RELATIVE reloc. Likewise if
1977 the symbol was forced to be local because of a version file.
1978 The entry in the global offset table will already have been
1979 initialized in the relocate_section function. */
1980 if (info->shared
1981 && (info->symbolic || h->dynindx == -1)
1982 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1983 {
1984 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1985 rela.r_addend = bfd_get_signed_32 (output_bfd,
1986 (sgot->contents
1987 + (h->got.offset & ~1)));
1988 }
1989 else
1990 {
1991 bfd_put_32 (output_bfd, (bfd_vma) 0,
1992 sgot->contents + (h->got.offset & ~1));
1993 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1994 rela.r_addend = 0;
1995 }
1996
1997 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1998 ((Elf32_External_Rela *) srela->contents
1999 + srela->reloc_count));
2000 ++srela->reloc_count;
2001 }
2002
2003 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2004 {
2005 asection *s;
2006 Elf_Internal_Rela rela;
2007
2008 /* This symbol needs a copy reloc. Set it up. */
2009
2010 BFD_ASSERT (h->dynindx != -1
2011 && (h->root.type == bfd_link_hash_defined
2012 || h->root.type == bfd_link_hash_defweak));
2013
2014 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2015 ".rela.bss");
2016 BFD_ASSERT (s != NULL);
2017
2018 rela.r_offset = (h->root.u.def.value
2019 + h->root.u.def.section->output_section->vma
2020 + h->root.u.def.section->output_offset);
2021 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
2022 rela.r_addend = 0;
2023 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2024 ((Elf32_External_Rela *) s->contents
2025 + s->reloc_count));
2026 ++s->reloc_count;
2027 }
2028
2029 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2030 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2031 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2032 sym->st_shndx = SHN_ABS;
2033
2034 return true;
2035 }
2036
2037 /* Finish up the dynamic sections. */
2038
2039 static boolean
2040 elf_m68k_finish_dynamic_sections (output_bfd, info)
2041 bfd *output_bfd;
2042 struct bfd_link_info *info;
2043 {
2044 bfd *dynobj;
2045 asection *sgot;
2046 asection *sdyn;
2047
2048 dynobj = elf_hash_table (info)->dynobj;
2049
2050 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2051 BFD_ASSERT (sgot != NULL);
2052 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2053
2054 if (elf_hash_table (info)->dynamic_sections_created)
2055 {
2056 asection *splt;
2057 Elf32_External_Dyn *dyncon, *dynconend;
2058
2059 splt = bfd_get_section_by_name (dynobj, ".plt");
2060 BFD_ASSERT (splt != NULL && sdyn != NULL);
2061
2062 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2063 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2064 for (; dyncon < dynconend; dyncon++)
2065 {
2066 Elf_Internal_Dyn dyn;
2067 const char *name;
2068 asection *s;
2069
2070 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2071
2072 switch (dyn.d_tag)
2073 {
2074 default:
2075 break;
2076
2077 case DT_PLTGOT:
2078 name = ".got";
2079 goto get_vma;
2080 case DT_JMPREL:
2081 name = ".rela.plt";
2082 get_vma:
2083 s = bfd_get_section_by_name (output_bfd, name);
2084 BFD_ASSERT (s != NULL);
2085 dyn.d_un.d_ptr = s->vma;
2086 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2087 break;
2088
2089 case DT_PLTRELSZ:
2090 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2091 BFD_ASSERT (s != NULL);
2092 if (s->_cooked_size != 0)
2093 dyn.d_un.d_val = s->_cooked_size;
2094 else
2095 dyn.d_un.d_val = s->_raw_size;
2096 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2097 break;
2098
2099 case DT_RELASZ:
2100 /* The procedure linkage table relocs (DT_JMPREL) should
2101 not be included in the overall relocs (DT_RELA).
2102 Therefore, we override the DT_RELASZ entry here to
2103 make it not include the JMPREL relocs. Since the
2104 linker script arranges for .rela.plt to follow all
2105 other relocation sections, we don't have to worry
2106 about changing the DT_RELA entry. */
2107 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2108 if (s != NULL)
2109 {
2110 if (s->_cooked_size != 0)
2111 dyn.d_un.d_val -= s->_cooked_size;
2112 else
2113 dyn.d_un.d_val -= s->_raw_size;
2114 }
2115 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2116 break;
2117 }
2118 }
2119
2120 /* Fill in the first entry in the procedure linkage table. */
2121 if (splt->_raw_size > 0)
2122 {
2123 if (!CPU32_FLAG (output_bfd))
2124 {
2125 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2126 bfd_put_32 (output_bfd,
2127 (sgot->output_section->vma
2128 + sgot->output_offset + 4
2129 - (splt->output_section->vma + 2)),
2130 splt->contents + 4);
2131 bfd_put_32 (output_bfd,
2132 (sgot->output_section->vma
2133 + sgot->output_offset + 8
2134 - (splt->output_section->vma + 10)),
2135 splt->contents + 12);
2136 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2137 = PLT_ENTRY_SIZE;
2138 }
2139 else /* cpu32 */
2140 {
2141 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2142 bfd_put_32 (output_bfd,
2143 (sgot->output_section->vma
2144 + sgot->output_offset + 4
2145 - (splt->output_section->vma + 2)),
2146 splt->contents + 4);
2147 bfd_put_32 (output_bfd,
2148 (sgot->output_section->vma
2149 + sgot->output_offset + 8
2150 - (splt->output_section->vma + 10)),
2151 splt->contents + 10);
2152 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2153 = PLT_CPU32_ENTRY_SIZE;
2154 }
2155 }
2156 }
2157
2158 /* Fill in the first three entries in the global offset table. */
2159 if (sgot->_raw_size > 0)
2160 {
2161 if (sdyn == NULL)
2162 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2163 else
2164 bfd_put_32 (output_bfd,
2165 sdyn->output_section->vma + sdyn->output_offset,
2166 sgot->contents);
2167 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2168 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2169 }
2170
2171 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2172
2173 return true;
2174 }
2175
2176 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2177 #define TARGET_BIG_NAME "elf32-m68k"
2178 #define ELF_MACHINE_CODE EM_68K
2179 #define ELF_MAXPAGESIZE 0x2000
2180 #define elf_backend_create_dynamic_sections \
2181 _bfd_elf_create_dynamic_sections
2182 #define bfd_elf32_bfd_link_hash_table_create \
2183 elf_m68k_link_hash_table_create
2184 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2185
2186 #define elf_backend_check_relocs elf_m68k_check_relocs
2187 #define elf_backend_adjust_dynamic_symbol \
2188 elf_m68k_adjust_dynamic_symbol
2189 #define elf_backend_size_dynamic_sections \
2190 elf_m68k_size_dynamic_sections
2191 #define elf_backend_relocate_section elf_m68k_relocate_section
2192 #define elf_backend_finish_dynamic_symbol \
2193 elf_m68k_finish_dynamic_symbol
2194 #define elf_backend_finish_dynamic_sections \
2195 elf_m68k_finish_dynamic_sections
2196 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2197 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2198 #define bfd_elf32_bfd_copy_private_bfd_data \
2199 elf32_m68k_copy_private_bfd_data
2200 #define bfd_elf32_bfd_merge_private_bfd_data \
2201 elf32_m68k_merge_private_bfd_data
2202 #define bfd_elf32_bfd_set_private_flags \
2203 elf32_m68k_set_private_flags
2204 #define bfd_elf32_bfd_print_private_bfd_data \
2205 elf32_m68k_print_private_bfd_data
2206
2207 #define elf_backend_can_gc_sections 1
2208 #define elf_backend_want_got_plt 1
2209 #define elf_backend_plt_readonly 1
2210 #define elf_backend_want_plt_sym 0
2211 #define elf_backend_got_header_size 12
2212
2213 #include "elf32-target.h"
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