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* gas/cris/*: New tests for CRIS.
[binutils.git] / bfd / elf32-m68k.c
blobbee73b5a57d44a9fc799d95978cc864bcd058dde
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 info->flags |= DF_TEXTREL;
1311 }
1312 }
1313
1314 return true;
1315 }
1316
1317 /* This function is called via elf_m68k_link_hash_traverse if we are
1318 creating a shared object with -Bsymbolic. It discards the space
1319 allocated to copy PC relative relocs against symbols which are defined
1320 in regular objects. We allocated space for them in the check_relocs
1321 routine, but we won't fill them in in the relocate_section routine. */
1322
1323 /*ARGSUSED*/
1324 static boolean
1325 elf_m68k_discard_copies (h, ignore)
1326 struct elf_m68k_link_hash_entry *h;
1327 PTR ignore ATTRIBUTE_UNUSED;
1328 {
1329 struct elf_m68k_pcrel_relocs_copied *s;
1330
1331 /* We only discard relocs for symbols defined in a regular object. */
1332 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1333 return true;
1334
1335 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1336 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1337
1338 return true;
1339 }
1340
1341 /* Relocate an M68K ELF section. */
1342
1343 static boolean
1344 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1345 contents, relocs, local_syms, local_sections)
1346 bfd *output_bfd;
1347 struct bfd_link_info *info;
1348 bfd *input_bfd;
1349 asection *input_section;
1350 bfd_byte *contents;
1351 Elf_Internal_Rela *relocs;
1352 Elf_Internal_Sym *local_syms;
1353 asection **local_sections;
1354 {
1355 bfd *dynobj;
1356 Elf_Internal_Shdr *symtab_hdr;
1357 struct elf_link_hash_entry **sym_hashes;
1358 bfd_vma *local_got_offsets;
1359 asection *sgot;
1360 asection *splt;
1361 asection *sreloc;
1362 Elf_Internal_Rela *rel;
1363 Elf_Internal_Rela *relend;
1364
1365 dynobj = elf_hash_table (info)->dynobj;
1366 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1367 sym_hashes = elf_sym_hashes (input_bfd);
1368 local_got_offsets = elf_local_got_offsets (input_bfd);
1369
1370 sgot = NULL;
1371 splt = NULL;
1372 sreloc = NULL;
1373
1374 rel = relocs;
1375 relend = relocs + input_section->reloc_count;
1376 for (; rel < relend; rel++)
1377 {
1378 int r_type;
1379 reloc_howto_type *howto;
1380 unsigned long r_symndx;
1381 struct elf_link_hash_entry *h;
1382 Elf_Internal_Sym *sym;
1383 asection *sec;
1384 bfd_vma relocation;
1385 bfd_reloc_status_type r;
1386
1387 r_type = ELF32_R_TYPE (rel->r_info);
1388 if (r_type < 0 || r_type >= (int) R_68K_max)
1389 {
1390 bfd_set_error (bfd_error_bad_value);
1391 return false;
1392 }
1393 howto = howto_table + r_type;
1394
1395 r_symndx = ELF32_R_SYM (rel->r_info);
1396
1397 if (info->relocateable)
1398 {
1399 /* This is a relocateable link. We don't have to change
1400 anything, unless the reloc is against a section symbol,
1401 in which case we have to adjust according to where the
1402 section symbol winds up in the output section. */
1403 if (r_symndx < symtab_hdr->sh_info)
1404 {
1405 sym = local_syms + r_symndx;
1406 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1407 {
1408 sec = local_sections[r_symndx];
1409 rel->r_addend += sec->output_offset + sym->st_value;
1410 }
1411 }
1412
1413 continue;
1414 }
1415
1416 /* This is a final link. */
1417 h = NULL;
1418 sym = NULL;
1419 sec = NULL;
1420 if (r_symndx < symtab_hdr->sh_info)
1421 {
1422 sym = local_syms + r_symndx;
1423 sec = local_sections[r_symndx];
1424 relocation = (sec->output_section->vma
1425 + sec->output_offset
1426 + sym->st_value);
1427 }
1428 else
1429 {
1430 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1431 while (h->root.type == bfd_link_hash_indirect
1432 || h->root.type == bfd_link_hash_warning)
1433 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1434 if (h->root.type == bfd_link_hash_defined
1435 || h->root.type == bfd_link_hash_defweak)
1436 {
1437 sec = h->root.u.def.section;
1438 if (((r_type == R_68K_PLT8
1439 || r_type == R_68K_PLT16
1440 || r_type == R_68K_PLT32
1441 || r_type == R_68K_PLT8O
1442 || r_type == R_68K_PLT16O
1443 || r_type == R_68K_PLT32O)
1444 && h->plt.offset != (bfd_vma) -1
1445 && elf_hash_table (info)->dynamic_sections_created)
1446 || ((r_type == R_68K_GOT8O
1447 || r_type == R_68K_GOT16O
1448 || r_type == R_68K_GOT32O
1449 || ((r_type == R_68K_GOT8
1450 || r_type == R_68K_GOT16
1451 || r_type == R_68K_GOT32)
1452 && strcmp (h->root.root.string,
1453 "_GLOBAL_OFFSET_TABLE_") != 0))
1454 && elf_hash_table (info)->dynamic_sections_created
1455 && (! info->shared
1456 || (! info->symbolic && h->dynindx != -1)
1457 || (h->elf_link_hash_flags
1458 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1459 || (info->shared
1460 && ((! info->symbolic && h->dynindx != -1)
1461 || (h->elf_link_hash_flags
1462 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1463 && (input_section->flags & SEC_ALLOC) != 0
1464 && (r_type == R_68K_8
1465 || r_type == R_68K_16
1466 || r_type == R_68K_32
1467 || r_type == R_68K_PC8
1468 || r_type == R_68K_PC16
1469 || r_type == R_68K_PC32)))
1470 {
1471 /* In these cases, we don't need the relocation
1472 value. We check specially because in some
1473 obscure cases sec->output_section will be NULL. */
1474 relocation = 0;
1475 }
1476 else
1477 relocation = (h->root.u.def.value
1478 + sec->output_section->vma
1479 + sec->output_offset);
1480 }
1481 else if (h->root.type == bfd_link_hash_undefweak)
1482 relocation = 0;
1483 else if (info->shared && !info->symbolic
1484 && !info->no_undefined
1485 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1486 relocation = 0;
1487 else
1488 {
1489 if (!(info->callbacks->undefined_symbol
1490 (info, h->root.root.string, input_bfd,
1491 input_section, rel->r_offset,
1492 (!info->shared || info->no_undefined
1493 || ELF_ST_VISIBILITY (h->other)))))
1494 return false;
1495 relocation = 0;
1496 }
1497 }
1498
1499 switch (r_type)
1500 {
1501 case R_68K_GOT8:
1502 case R_68K_GOT16:
1503 case R_68K_GOT32:
1504 /* Relocation is to the address of the entry for this symbol
1505 in the global offset table. */
1506 if (h != NULL
1507 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1508 break;
1509 /* Fall through. */
1510 case R_68K_GOT8O:
1511 case R_68K_GOT16O:
1512 case R_68K_GOT32O:
1513 /* Relocation is the offset of the entry for this symbol in
1514 the global offset table. */
1515
1516 {
1517 bfd_vma off;
1518
1519 if (sgot == NULL)
1520 {
1521 sgot = bfd_get_section_by_name (dynobj, ".got");
1522 BFD_ASSERT (sgot != NULL);
1523 }
1524
1525 if (h != NULL)
1526 {
1527 off = h->got.offset;
1528 BFD_ASSERT (off != (bfd_vma) -1);
1529
1530 if (!elf_hash_table (info)->dynamic_sections_created
1531 || (info->shared
1532 && (info->symbolic || h->dynindx == -1)
1533 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1534 {
1535 /* This is actually a static link, or it is a
1536 -Bsymbolic link and the symbol is defined
1537 locally, or the symbol was forced to be local
1538 because of a version file.. We must initialize
1539 this entry in the global offset table. Since
1540 the offset must always be a multiple of 4, we
1541 use the least significant bit to record whether
1542 we have initialized it already.
1543
1544 When doing a dynamic link, we create a .rela.got
1545 relocation entry to initialize the value. This
1546 is done in the finish_dynamic_symbol routine. */
1547 if ((off & 1) != 0)
1548 off &= ~1;
1549 else
1550 {
1551 bfd_put_32 (output_bfd, relocation,
1552 sgot->contents + off);
1553 h->got.offset |= 1;
1554 }
1555 }
1556 }
1557 else
1558 {
1559 BFD_ASSERT (local_got_offsets != NULL
1560 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1561
1562 off = local_got_offsets[r_symndx];
1563
1564 /* The offset must always be a multiple of 4. We use
1565 the least significant bit to record whether we have
1566 already generated the necessary reloc. */
1567 if ((off & 1) != 0)
1568 off &= ~1;
1569 else
1570 {
1571 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1572
1573 if (info->shared)
1574 {
1575 asection *srelgot;
1576 Elf_Internal_Rela outrel;
1577
1578 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1579 BFD_ASSERT (srelgot != NULL);
1580
1581 outrel.r_offset = (sgot->output_section->vma
1582 + sgot->output_offset
1583 + off);
1584 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1585 outrel.r_addend = relocation;
1586 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1587 (((Elf32_External_Rela *)
1588 srelgot->contents)
1589 + srelgot->reloc_count));
1590 ++srelgot->reloc_count;
1591 }
1592
1593 local_got_offsets[r_symndx] |= 1;
1594 }
1595 }
1596
1597 relocation = sgot->output_offset + off;
1598 if (r_type == R_68K_GOT8O
1599 || r_type == R_68K_GOT16O
1600 || r_type == R_68K_GOT32O)
1601 {
1602 /* This relocation does not use the addend. */
1603 rel->r_addend = 0;
1604 }
1605 else
1606 relocation += sgot->output_section->vma;
1607 }
1608 break;
1609
1610 case R_68K_PLT8:
1611 case R_68K_PLT16:
1612 case R_68K_PLT32:
1613 /* Relocation is to the entry for this symbol in the
1614 procedure linkage table. */
1615
1616 /* Resolve a PLTxx reloc against a local symbol directly,
1617 without using the procedure linkage table. */
1618 if (h == NULL)
1619 break;
1620
1621 if (h->plt.offset == (bfd_vma) -1
1622 || !elf_hash_table (info)->dynamic_sections_created)
1623 {
1624 /* We didn't make a PLT entry for this symbol. This
1625 happens when statically linking PIC code, or when
1626 using -Bsymbolic. */
1627 break;
1628 }
1629
1630 if (splt == NULL)
1631 {
1632 splt = bfd_get_section_by_name (dynobj, ".plt");
1633 BFD_ASSERT (splt != NULL);
1634 }
1635
1636 relocation = (splt->output_section->vma
1637 + splt->output_offset
1638 + h->plt.offset);
1639 break;
1640
1641 case R_68K_PLT8O:
1642 case R_68K_PLT16O:
1643 case R_68K_PLT32O:
1644 /* Relocation is the offset of the entry for this symbol in
1645 the procedure linkage table. */
1646 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1647
1648 if (splt == NULL)
1649 {
1650 splt = bfd_get_section_by_name (dynobj, ".plt");
1651 BFD_ASSERT (splt != NULL);
1652 }
1653
1654 relocation = h->plt.offset;
1655
1656 /* This relocation does not use the addend. */
1657 rel->r_addend = 0;
1658
1659 break;
1660
1661 case R_68K_PC8:
1662 case R_68K_PC16:
1663 case R_68K_PC32:
1664 if (h == NULL)
1665 break;
1666 /* Fall through. */
1667 case R_68K_8:
1668 case R_68K_16:
1669 case R_68K_32:
1670 if (info->shared
1671 && (input_section->flags & SEC_ALLOC) != 0
1672 && ((r_type != R_68K_PC8
1673 && r_type != R_68K_PC16
1674 && r_type != R_68K_PC32)
1675 || (!info->symbolic
1676 || (h->elf_link_hash_flags
1677 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1678 {
1679 Elf_Internal_Rela outrel;
1680 boolean skip, relocate;
1681
1682 /* When generating a shared object, these relocations
1683 are copied into the output file to be resolved at run
1684 time. */
1685
1686 if (sreloc == NULL)
1687 {
1688 const char *name;
1689
1690 name = (bfd_elf_string_from_elf_section
1691 (input_bfd,
1692 elf_elfheader (input_bfd)->e_shstrndx,
1693 elf_section_data (input_section)->rel_hdr.sh_name));
1694 if (name == NULL)
1695 return false;
1696
1697 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1698 && strcmp (bfd_get_section_name (input_bfd,
1699 input_section),
1700 name + 5) == 0);
1701
1702 sreloc = bfd_get_section_by_name (dynobj, name);
1703 BFD_ASSERT (sreloc != NULL);
1704 }
1705
1706 skip = false;
1707
1708 if (elf_section_data (input_section)->stab_info == NULL)
1709 outrel.r_offset = rel->r_offset;
1710 else
1711 {
1712 bfd_vma off;
1713
1714 off = (_bfd_stab_section_offset
1715 (output_bfd, &elf_hash_table (info)->stab_info,
1716 input_section,
1717 &elf_section_data (input_section)->stab_info,
1718 rel->r_offset));
1719 if (off == (bfd_vma) -1)
1720 skip = true;
1721 outrel.r_offset = off;
1722 }
1723
1724 outrel.r_offset += (input_section->output_section->vma
1725 + input_section->output_offset);
1726
1727 if (skip)
1728 {
1729 memset (&outrel, 0, sizeof outrel);
1730 relocate = false;
1731 }
1732 /* h->dynindx may be -1 if the symbol was marked to
1733 become local. */
1734 else if (h != NULL
1735 && ((! info->symbolic && h->dynindx != -1)
1736 || (h->elf_link_hash_flags
1737 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1738 {
1739 BFD_ASSERT (h->dynindx != -1);
1740 relocate = false;
1741 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1742 outrel.r_addend = relocation + rel->r_addend;
1743 }
1744 else
1745 {
1746 if (r_type == R_68K_32)
1747 {
1748 relocate = true;
1749 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1750 outrel.r_addend = relocation + rel->r_addend;
1751 }
1752 else
1753 {
1754 long indx;
1755
1756 if (h == NULL)
1757 sec = local_sections[r_symndx];
1758 else
1759 {
1760 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1761 || (h->root.type
1762 == bfd_link_hash_defweak));
1763 sec = h->root.u.def.section;
1764 }
1765 if (sec != NULL && bfd_is_abs_section (sec))
1766 indx = 0;
1767 else if (sec == NULL || sec->owner == NULL)
1768 {
1769 bfd_set_error (bfd_error_bad_value);
1770 return false;
1771 }
1772 else
1773 {
1774 asection *osec;
1775
1776 osec = sec->output_section;
1777 indx = elf_section_data (osec)->dynindx;
1778 BFD_ASSERT (indx > 0);
1779 }
1780
1781 relocate = false;
1782 outrel.r_info = ELF32_R_INFO (indx, r_type);
1783 outrel.r_addend = relocation + rel->r_addend;
1784 }
1785 }
1786
1787 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1788 (((Elf32_External_Rela *)
1789 sreloc->contents)
1790 + sreloc->reloc_count));
1791 ++sreloc->reloc_count;
1792
1793 /* This reloc will be computed at runtime, so there's no
1794 need to do anything now, except for R_68K_32
1795 relocations that have been turned into
1796 R_68K_RELATIVE. */
1797 if (!relocate)
1798 continue;
1799 }
1800
1801 break;
1802
1803 case R_68K_GNU_VTINHERIT:
1804 case R_68K_GNU_VTENTRY:
1805 /* These are no-ops in the end. */
1806 continue;
1807
1808 default:
1809 break;
1810 }
1811
1812 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1813 contents, rel->r_offset,
1814 relocation, rel->r_addend);
1815
1816 if (r != bfd_reloc_ok)
1817 {
1818 switch (r)
1819 {
1820 default:
1821 case bfd_reloc_outofrange:
1822 abort ();
1823 case bfd_reloc_overflow:
1824 {
1825 const char *name;
1826
1827 if (h != NULL)
1828 name = h->root.root.string;
1829 else
1830 {
1831 name = bfd_elf_string_from_elf_section (input_bfd,
1832 symtab_hdr->sh_link,
1833 sym->st_name);
1834 if (name == NULL)
1835 return false;
1836 if (*name == '\0')
1837 name = bfd_section_name (input_bfd, sec);
1838 }
1839 if (!(info->callbacks->reloc_overflow
1840 (info, name, howto->name, (bfd_vma) 0,
1841 input_bfd, input_section, rel->r_offset)))
1842 return false;
1843 }
1844 break;
1845 }
1846 }
1847 }
1848
1849 return true;
1850 }
1851
1852 /* Finish up dynamic symbol handling. We set the contents of various
1853 dynamic sections here. */
1854
1855 static boolean
1856 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1857 bfd *output_bfd;
1858 struct bfd_link_info *info;
1859 struct elf_link_hash_entry *h;
1860 Elf_Internal_Sym *sym;
1861 {
1862 bfd *dynobj;
1863 int plt_off1, plt_off2, plt_off3;
1864
1865 dynobj = elf_hash_table (info)->dynobj;
1866
1867 if (h->plt.offset != (bfd_vma) -1)
1868 {
1869 asection *splt;
1870 asection *sgot;
1871 asection *srela;
1872 bfd_vma plt_index;
1873 bfd_vma got_offset;
1874 Elf_Internal_Rela rela;
1875
1876 /* This symbol has an entry in the procedure linkage table. Set
1877 it up. */
1878
1879 BFD_ASSERT (h->dynindx != -1);
1880
1881 splt = bfd_get_section_by_name (dynobj, ".plt");
1882 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1883 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1884 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1885
1886 /* Get the index in the procedure linkage table which
1887 corresponds to this symbol. This is the index of this symbol
1888 in all the symbols for which we are making plt entries. The
1889 first entry in the procedure linkage table is reserved. */
1890 if ( CPU32_FLAG (output_bfd))
1891 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1892 else
1893 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1894
1895 /* Get the offset into the .got table of the entry that
1896 corresponds to this function. Each .got entry is 4 bytes.
1897 The first three are reserved. */
1898 got_offset = (plt_index + 3) * 4;
1899
1900 if ( CPU32_FLAG (output_bfd))
1901 {
1902 /* Fill in the entry in the procedure linkage table. */
1903 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1904 PLT_CPU32_ENTRY_SIZE);
1905 plt_off1 = 4;
1906 plt_off2 = 12;
1907 plt_off3 = 18;
1908 }
1909 else
1910 {
1911 /* Fill in the entry in the procedure linkage table. */
1912 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1913 PLT_ENTRY_SIZE);
1914 plt_off1 = 4;
1915 plt_off2 = 10;
1916 plt_off3 = 16;
1917 }
1918
1919 /* The offset is relative to the first extension word. */
1920 bfd_put_32 (output_bfd,
1921 (sgot->output_section->vma
1922 + sgot->output_offset
1923 + got_offset
1924 - (splt->output_section->vma
1925 + h->plt.offset + 2)),
1926 splt->contents + h->plt.offset + plt_off1);
1927
1928 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1929 splt->contents + h->plt.offset + plt_off2);
1930 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1931 splt->contents + h->plt.offset + plt_off3);
1932
1933 /* Fill in the entry in the global offset table. */
1934 bfd_put_32 (output_bfd,
1935 (splt->output_section->vma
1936 + splt->output_offset
1937 + h->plt.offset
1938 + 8),
1939 sgot->contents + got_offset);
1940
1941 /* Fill in the entry in the .rela.plt section. */
1942 rela.r_offset = (sgot->output_section->vma
1943 + sgot->output_offset
1944 + got_offset);
1945 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1946 rela.r_addend = 0;
1947 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1948 ((Elf32_External_Rela *) srela->contents
1949 + plt_index));
1950
1951 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1952 {
1953 /* Mark the symbol as undefined, rather than as defined in
1954 the .plt section. Leave the value alone. */
1955 sym->st_shndx = SHN_UNDEF;
1956 }
1957 }
1958
1959 if (h->got.offset != (bfd_vma) -1)
1960 {
1961 asection *sgot;
1962 asection *srela;
1963 Elf_Internal_Rela rela;
1964
1965 /* This symbol has an entry in the global offset table. Set it
1966 up. */
1967
1968 sgot = bfd_get_section_by_name (dynobj, ".got");
1969 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1970 BFD_ASSERT (sgot != NULL && srela != NULL);
1971
1972 rela.r_offset = (sgot->output_section->vma
1973 + sgot->output_offset
1974 + (h->got.offset &~ 1));
1975
1976 /* If this is a -Bsymbolic link, and the symbol is defined
1977 locally, we just want to emit a RELATIVE reloc. Likewise if
1978 the symbol was forced to be local because of a version file.
1979 The entry in the global offset table will already have been
1980 initialized in the relocate_section function. */
1981 if (info->shared
1982 && (info->symbolic || h->dynindx == -1)
1983 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1984 {
1985 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1986 rela.r_addend = bfd_get_signed_32 (output_bfd,
1987 (sgot->contents
1988 + (h->got.offset & ~1)));
1989 }
1990 else
1991 {
1992 bfd_put_32 (output_bfd, (bfd_vma) 0,
1993 sgot->contents + (h->got.offset & ~1));
1994 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1995 rela.r_addend = 0;
1996 }
1997
1998 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1999 ((Elf32_External_Rela *) srela->contents
2000 + srela->reloc_count));
2001 ++srela->reloc_count;
2002 }
2003
2004 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2005 {
2006 asection *s;
2007 Elf_Internal_Rela rela;
2008
2009 /* This symbol needs a copy reloc. Set it up. */
2010
2011 BFD_ASSERT (h->dynindx != -1
2012 && (h->root.type == bfd_link_hash_defined
2013 || h->root.type == bfd_link_hash_defweak));
2014
2015 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2016 ".rela.bss");
2017 BFD_ASSERT (s != NULL);
2018
2019 rela.r_offset = (h->root.u.def.value
2020 + h->root.u.def.section->output_section->vma
2021 + h->root.u.def.section->output_offset);
2022 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
2023 rela.r_addend = 0;
2024 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2025 ((Elf32_External_Rela *) s->contents
2026 + s->reloc_count));
2027 ++s->reloc_count;
2028 }
2029
2030 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2031 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2032 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2033 sym->st_shndx = SHN_ABS;
2034
2035 return true;
2036 }
2037
2038 /* Finish up the dynamic sections. */
2039
2040 static boolean
2041 elf_m68k_finish_dynamic_sections (output_bfd, info)
2042 bfd *output_bfd;
2043 struct bfd_link_info *info;
2044 {
2045 bfd *dynobj;
2046 asection *sgot;
2047 asection *sdyn;
2048
2049 dynobj = elf_hash_table (info)->dynobj;
2050
2051 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2052 BFD_ASSERT (sgot != NULL);
2053 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2054
2055 if (elf_hash_table (info)->dynamic_sections_created)
2056 {
2057 asection *splt;
2058 Elf32_External_Dyn *dyncon, *dynconend;
2059
2060 splt = bfd_get_section_by_name (dynobj, ".plt");
2061 BFD_ASSERT (splt != NULL && sdyn != NULL);
2062
2063 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2064 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2065 for (; dyncon < dynconend; dyncon++)
2066 {
2067 Elf_Internal_Dyn dyn;
2068 const char *name;
2069 asection *s;
2070
2071 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2072
2073 switch (dyn.d_tag)
2074 {
2075 default:
2076 break;
2077
2078 case DT_PLTGOT:
2079 name = ".got";
2080 goto get_vma;
2081 case DT_JMPREL:
2082 name = ".rela.plt";
2083 get_vma:
2084 s = bfd_get_section_by_name (output_bfd, name);
2085 BFD_ASSERT (s != NULL);
2086 dyn.d_un.d_ptr = s->vma;
2087 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2088 break;
2089
2090 case DT_PLTRELSZ:
2091 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2092 BFD_ASSERT (s != NULL);
2093 if (s->_cooked_size != 0)
2094 dyn.d_un.d_val = s->_cooked_size;
2095 else
2096 dyn.d_un.d_val = s->_raw_size;
2097 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2098 break;
2099
2100 case DT_RELASZ:
2101 /* The procedure linkage table relocs (DT_JMPREL) should
2102 not be included in the overall relocs (DT_RELA).
2103 Therefore, we override the DT_RELASZ entry here to
2104 make it not include the JMPREL relocs. Since the
2105 linker script arranges for .rela.plt to follow all
2106 other relocation sections, we don't have to worry
2107 about changing the DT_RELA entry. */
2108 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2109 if (s != NULL)
2110 {
2111 if (s->_cooked_size != 0)
2112 dyn.d_un.d_val -= s->_cooked_size;
2113 else
2114 dyn.d_un.d_val -= s->_raw_size;
2115 }
2116 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2117 break;
2118 }
2119 }
2120
2121 /* Fill in the first entry in the procedure linkage table. */
2122 if (splt->_raw_size > 0)
2123 {
2124 if (!CPU32_FLAG (output_bfd))
2125 {
2126 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2127 bfd_put_32 (output_bfd,
2128 (sgot->output_section->vma
2129 + sgot->output_offset + 4
2130 - (splt->output_section->vma + 2)),
2131 splt->contents + 4);
2132 bfd_put_32 (output_bfd,
2133 (sgot->output_section->vma
2134 + sgot->output_offset + 8
2135 - (splt->output_section->vma + 10)),
2136 splt->contents + 12);
2137 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2138 = PLT_ENTRY_SIZE;
2139 }
2140 else /* cpu32 */
2141 {
2142 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2143 bfd_put_32 (output_bfd,
2144 (sgot->output_section->vma
2145 + sgot->output_offset + 4
2146 - (splt->output_section->vma + 2)),
2147 splt->contents + 4);
2148 bfd_put_32 (output_bfd,
2149 (sgot->output_section->vma
2150 + sgot->output_offset + 8
2151 - (splt->output_section->vma + 10)),
2152 splt->contents + 10);
2153 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2154 = PLT_CPU32_ENTRY_SIZE;
2155 }
2156 }
2157 }
2158
2159 /* Fill in the first three entries in the global offset table. */
2160 if (sgot->_raw_size > 0)
2161 {
2162 if (sdyn == NULL)
2163 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2164 else
2165 bfd_put_32 (output_bfd,
2166 sdyn->output_section->vma + sdyn->output_offset,
2167 sgot->contents);
2168 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2169 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2170 }
2171
2172 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2173
2174 return true;
2175 }
2176
2177 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2178 #define TARGET_BIG_NAME "elf32-m68k"
2179 #define ELF_MACHINE_CODE EM_68K
2180 #define ELF_MAXPAGESIZE 0x2000
2181 #define elf_backend_create_dynamic_sections \
2182 _bfd_elf_create_dynamic_sections
2183 #define bfd_elf32_bfd_link_hash_table_create \
2184 elf_m68k_link_hash_table_create
2185 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2186
2187 #define elf_backend_check_relocs elf_m68k_check_relocs
2188 #define elf_backend_adjust_dynamic_symbol \
2189 elf_m68k_adjust_dynamic_symbol
2190 #define elf_backend_size_dynamic_sections \
2191 elf_m68k_size_dynamic_sections
2192 #define elf_backend_relocate_section elf_m68k_relocate_section
2193 #define elf_backend_finish_dynamic_symbol \
2194 elf_m68k_finish_dynamic_symbol
2195 #define elf_backend_finish_dynamic_sections \
2196 elf_m68k_finish_dynamic_sections
2197 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2198 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2199 #define bfd_elf32_bfd_copy_private_bfd_data \
2200 elf32_m68k_copy_private_bfd_data
2201 #define bfd_elf32_bfd_merge_private_bfd_data \
2202 elf32_m68k_merge_private_bfd_data
2203 #define bfd_elf32_bfd_set_private_flags \
2204 elf32_m68k_set_private_flags
2205 #define bfd_elf32_bfd_print_private_bfd_data \
2206 elf32_m68k_print_private_bfd_data
2207
2208 #define elf_backend_can_gc_sections 1
2209 #define elf_backend_want_got_plt 1
2210 #define elf_backend_plt_readonly 1
2211 #define elf_backend_want_plt_sym 0
2212 #define elf_backend_got_header_size 12
2213
2214 #include "elf32-target.h"
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