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file ld.info-6 was initially added on branch binutils-2_11-branch.
[binutils.git] / bfd / elf32-m68k.c
blob6ce7360e02b8ff6051c2822afb4e29fcd93d07f1
1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/m68k.h"
27
28 static reloc_howto_type *reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30 static void rtype_to_howto
31 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
32 static struct bfd_hash_entry *elf_m68k_link_hash_newfunc
33 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
34 static struct bfd_link_hash_table *elf_m68k_link_hash_table_create
35 PARAMS ((bfd *));
36 static boolean elf_m68k_check_relocs
37 PARAMS ((bfd *, struct bfd_link_info *, asection *,
38 const Elf_Internal_Rela *));
39 static asection *elf_m68k_gc_mark_hook
40 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
41 struct elf_link_hash_entry *, Elf_Internal_Sym *));
42 static boolean elf_m68k_gc_sweep_hook
43 PARAMS ((bfd *, struct bfd_link_info *, asection *,
44 const Elf_Internal_Rela *));
45 static boolean elf_m68k_adjust_dynamic_symbol
46 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
47 static boolean elf_m68k_size_dynamic_sections
48 PARAMS ((bfd *, struct bfd_link_info *));
49 static boolean elf_m68k_relocate_section
50 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
51 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
52 static boolean elf_m68k_finish_dynamic_symbol
53 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
54 Elf_Internal_Sym *));
55 static boolean elf_m68k_finish_dynamic_sections
56 PARAMS ((bfd *, struct bfd_link_info *));
57
58 static boolean elf32_m68k_set_private_flags
59 PARAMS ((bfd *, flagword));
60 static boolean elf32_m68k_copy_private_bfd_data
61 PARAMS ((bfd *, bfd *));
62 static boolean elf32_m68k_merge_private_bfd_data
63 PARAMS ((bfd *, bfd *));
64 static boolean elf32_m68k_print_private_bfd_data
65 PARAMS ((bfd *, PTR));
66
67 static reloc_howto_type howto_table[] = {
68 HOWTO(R_68K_NONE, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", false, 0, 0x00000000,false),
69 HOWTO(R_68K_32, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0, 0xffffffff,false),
70 HOWTO(R_68K_16, 0, 1,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0, 0x0000ffff,false),
71 HOWTO(R_68K_8, 0, 0, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0, 0x000000ff,false),
72 HOWTO(R_68K_PC32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", false, 0, 0xffffffff,true),
73 HOWTO(R_68K_PC16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0, 0x0000ffff,true),
74 HOWTO(R_68K_PC8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0, 0x000000ff,true),
75 HOWTO(R_68K_GOT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0, 0xffffffff,true),
76 HOWTO(R_68K_GOT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0, 0x0000ffff,true),
77 HOWTO(R_68K_GOT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0, 0x000000ff,true),
78 HOWTO(R_68K_GOT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0, 0xffffffff,false),
79 HOWTO(R_68K_GOT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0, 0x0000ffff,false),
80 HOWTO(R_68K_GOT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0, 0x000000ff,false),
81 HOWTO(R_68K_PLT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0, 0xffffffff,true),
82 HOWTO(R_68K_PLT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0, 0x0000ffff,true),
83 HOWTO(R_68K_PLT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0, 0x000000ff,true),
84 HOWTO(R_68K_PLT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0, 0xffffffff,false),
85 HOWTO(R_68K_PLT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0, 0x0000ffff,false),
86 HOWTO(R_68K_PLT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", false, 0, 0x000000ff,false),
87 HOWTO(R_68K_COPY, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", false, 0, 0xffffffff,false),
88 HOWTO(R_68K_GLOB_DAT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", false, 0, 0xffffffff,false),
89 HOWTO(R_68K_JMP_SLOT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", false, 0, 0xffffffff,false),
90 HOWTO(R_68K_RELATIVE, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", false, 0, 0xffffffff,false),
91 /* GNU extension to record C++ vtable hierarchy */
92 HOWTO (R_68K_GNU_VTINHERIT, /* type */
93 0, /* rightshift */
94 2, /* size (0 = byte, 1 = short, 2 = long) */
95 0, /* bitsize */
96 false, /* pc_relative */
97 0, /* bitpos */
98 complain_overflow_dont, /* complain_on_overflow */
99 NULL, /* special_function */
100 "R_68K_GNU_VTINHERIT", /* name */
101 false, /* partial_inplace */
102 0, /* src_mask */
103 0, /* dst_mask */
104 false),
105 /* GNU extension to record C++ vtable member usage */
106 HOWTO (R_68K_GNU_VTENTRY, /* type */
107 0, /* rightshift */
108 2, /* size (0 = byte, 1 = short, 2 = long) */
109 0, /* bitsize */
110 false, /* pc_relative */
111 0, /* bitpos */
112 complain_overflow_dont, /* complain_on_overflow */
113 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
114 "R_68K_GNU_VTENTRY", /* name */
115 false, /* partial_inplace */
116 0, /* src_mask */
117 0, /* dst_mask */
118 false),
119 };
120
121 static void
122 rtype_to_howto (abfd, cache_ptr, dst)
123 bfd *abfd ATTRIBUTE_UNUSED;
124 arelent *cache_ptr;
125 Elf_Internal_Rela *dst;
126 {
127 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max);
128 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
129 }
130
131 #define elf_info_to_howto rtype_to_howto
132
133 static const struct
134 {
135 bfd_reloc_code_real_type bfd_val;
136 int elf_val;
137 } reloc_map[] = {
138 { BFD_RELOC_NONE, R_68K_NONE },
139 { BFD_RELOC_32, R_68K_32 },
140 { BFD_RELOC_16, R_68K_16 },
141 { BFD_RELOC_8, R_68K_8 },
142 { BFD_RELOC_32_PCREL, R_68K_PC32 },
143 { BFD_RELOC_16_PCREL, R_68K_PC16 },
144 { BFD_RELOC_8_PCREL, R_68K_PC8 },
145 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 },
146 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 },
147 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 },
148 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O },
149 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O },
150 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O },
151 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 },
152 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 },
153 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 },
154 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O },
155 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O },
156 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O },
157 { BFD_RELOC_NONE, R_68K_COPY },
158 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT },
159 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT },
160 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE },
161 { BFD_RELOC_CTOR, R_68K_32 },
162 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT },
163 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY },
164 };
165
166 static reloc_howto_type *
167 reloc_type_lookup (abfd, code)
168 bfd *abfd ATTRIBUTE_UNUSED;
169 bfd_reloc_code_real_type code;
170 {
171 unsigned int i;
172 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
173 {
174 if (reloc_map[i].bfd_val == code)
175 return &howto_table[reloc_map[i].elf_val];
176 }
177 return 0;
178 }
179
180 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
181 #define ELF_ARCH bfd_arch_m68k
182 /* end code generated by elf.el */
183
184 #define USE_RELA
185 \f
186 /* Functions for the m68k ELF linker. */
187
188 /* The name of the dynamic interpreter. This is put in the .interp
189 section. */
190
191 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
192
193 /* The size in bytes of an entry in the procedure linkage table. */
194
195 #define PLT_ENTRY_SIZE 20
196
197 /* The first entry in a procedure linkage table looks like this. See
198 the SVR4 ABI m68k supplement to see how this works. */
199
200 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
201 {
202 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
203 0, 0, 0, 0, /* replaced with offset to .got + 4. */
204 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
205 0, 0, 0, 0, /* replaced with offset to .got + 8. */
206 0, 0, 0, 0 /* pad out to 20 bytes. */
207 };
208
209 /* Subsequent entries in a procedure linkage table look like this. */
210
211 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
212 {
213 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
214 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
215 0x2f, 0x3c, /* move.l #offset,-(%sp) */
216 0, 0, 0, 0, /* replaced with offset into relocation table. */
217 0x60, 0xff, /* bra.l .plt */
218 0, 0, 0, 0 /* replaced with offset to start of .plt. */
219 };
220
221 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
222
223 #define PLT_CPU32_ENTRY_SIZE 24
224 /* Procedure linkage table entries for the cpu32 */
225 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
226 {
227 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
228 0, 0, 0, 0, /* replaced with offset to .got + 4. */
229 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
230 0, 0, 0, 0, /* replace with offset to .got +8. */
231 0x4e, 0xd1, /* jmp %a1@ */
232 0, 0, 0, 0, /* pad out to 24 bytes. */
233 0, 0
234 };
235
236 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
237 {
238 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
239 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
240 0x4e, 0xd1, /* jmp %a1@ */
241 0x2f, 0x3c, /* move.l #offset,-(%sp) */
242 0, 0, 0, 0, /* replaced with offset into relocation table. */
243 0x60, 0xff, /* bra.l .plt */
244 0, 0, 0, 0, /* replaced with offset to start of .plt. */
245 0, 0
246 };
247
248 /* The m68k linker needs to keep track of the number of relocs that it
249 decides to copy in check_relocs for each symbol. This is so that it
250 can discard PC relative relocs if it doesn't need them when linking
251 with -Bsymbolic. We store the information in a field extending the
252 regular ELF linker hash table. */
253
254 /* This structure keeps track of the number of PC relative relocs we have
255 copied for a given symbol. */
256
257 struct elf_m68k_pcrel_relocs_copied
258 {
259 /* Next section. */
260 struct elf_m68k_pcrel_relocs_copied *next;
261 /* A section in dynobj. */
262 asection *section;
263 /* Number of relocs copied in this section. */
264 bfd_size_type count;
265 };
266
267 /* m68k ELF linker hash entry. */
268
269 struct elf_m68k_link_hash_entry
270 {
271 struct elf_link_hash_entry root;
272
273 /* Number of PC relative relocs copied for this symbol. */
274 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
275 };
276
277 /* m68k ELF linker hash table. */
278
279 struct elf_m68k_link_hash_table
280 {
281 struct elf_link_hash_table root;
282 };
283
284 /* Declare this now that the above structures are defined. */
285
286 static boolean elf_m68k_discard_copies
287 PARAMS ((struct elf_m68k_link_hash_entry *, PTR));
288
289 /* Traverse an m68k ELF linker hash table. */
290
291 #define elf_m68k_link_hash_traverse(table, func, info) \
292 (elf_link_hash_traverse \
293 (&(table)->root, \
294 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
295 (info)))
296
297 /* Get the m68k ELF linker hash table from a link_info structure. */
298
299 #define elf_m68k_hash_table(p) \
300 ((struct elf_m68k_link_hash_table *) (p)->hash)
301
302 /* Create an entry in an m68k ELF linker hash table. */
303
304 static struct bfd_hash_entry *
305 elf_m68k_link_hash_newfunc (entry, table, string)
306 struct bfd_hash_entry *entry;
307 struct bfd_hash_table *table;
308 const char *string;
309 {
310 struct elf_m68k_link_hash_entry *ret =
311 (struct elf_m68k_link_hash_entry *) entry;
312
313 /* Allocate the structure if it has not already been allocated by a
314 subclass. */
315 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
316 ret = ((struct elf_m68k_link_hash_entry *)
317 bfd_hash_allocate (table,
318 sizeof (struct elf_m68k_link_hash_entry)));
319 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
320 return (struct bfd_hash_entry *) ret;
321
322 /* Call the allocation method of the superclass. */
323 ret = ((struct elf_m68k_link_hash_entry *)
324 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
325 table, string));
326 if (ret != (struct elf_m68k_link_hash_entry *) NULL)
327 {
328 ret->pcrel_relocs_copied = NULL;
329 }
330
331 return (struct bfd_hash_entry *) ret;
332 }
333
334 /* Create an m68k ELF linker hash table. */
335
336 static struct bfd_link_hash_table *
337 elf_m68k_link_hash_table_create (abfd)
338 bfd *abfd;
339 {
340 struct elf_m68k_link_hash_table *ret;
341
342 ret = ((struct elf_m68k_link_hash_table *)
343 bfd_alloc (abfd, sizeof (struct elf_m68k_link_hash_table)));
344 if (ret == (struct elf_m68k_link_hash_table *) NULL)
345 return NULL;
346
347 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
348 elf_m68k_link_hash_newfunc))
349 {
350 bfd_release (abfd, ret);
351 return NULL;
352 }
353
354 return &ret->root.root;
355 }
356
357 /* Keep m68k-specific flags in the ELF header */
358 static boolean
359 elf32_m68k_set_private_flags (abfd, flags)
360 bfd *abfd;
361 flagword flags;
362 {
363 elf_elfheader (abfd)->e_flags = flags;
364 elf_flags_init (abfd) = true;
365 return true;
366 }
367
368 /* Copy m68k-specific data from one module to another */
369 static boolean
370 elf32_m68k_copy_private_bfd_data (ibfd, obfd)
371 bfd *ibfd;
372 bfd *obfd;
373 {
374 flagword in_flags;
375
376 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
377 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
378 return true;
379
380 in_flags = elf_elfheader (ibfd)->e_flags;
381
382 elf_elfheader (obfd)->e_flags = in_flags;
383 elf_flags_init (obfd) = true;
384
385 return true;
386 }
387
388 /* Merge backend specific data from an object file to the output
389 object file when linking. */
390 static boolean
391 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
392 bfd *ibfd;
393 bfd *obfd;
394 {
395 flagword out_flags;
396 flagword in_flags;
397
398 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
399 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
400 return true;
401
402 in_flags = elf_elfheader (ibfd)->e_flags;
403 out_flags = elf_elfheader (obfd)->e_flags;
404
405 if (!elf_flags_init (obfd))
406 {
407 elf_flags_init (obfd) = true;
408 elf_elfheader (obfd)->e_flags = in_flags;
409 }
410
411 return true;
412 }
413
414 /* Display the flags field */
415 static boolean
416 elf32_m68k_print_private_bfd_data (abfd, ptr)
417 bfd *abfd;
418 PTR ptr;
419 {
420 FILE *file = (FILE *) ptr;
421
422 BFD_ASSERT (abfd != NULL && ptr != NULL);
423
424 /* Print normal ELF private data. */
425 _bfd_elf_print_private_bfd_data (abfd, ptr);
426
427 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
428
429 /* xgettext:c-format */
430 fprintf (file, _ ("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
431
432 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
433 fprintf (file, _ (" [cpu32]"));
434
435 fputc ('\n', file);
436
437 return true;
438 }
439 /* Look through the relocs for a section during the first phase, and
440 allocate space in the global offset table or procedure linkage
441 table. */
442
443 static boolean
444 elf_m68k_check_relocs (abfd, info, sec, relocs)
445 bfd *abfd;
446 struct bfd_link_info *info;
447 asection *sec;
448 const Elf_Internal_Rela *relocs;
449 {
450 bfd *dynobj;
451 Elf_Internal_Shdr *symtab_hdr;
452 struct elf_link_hash_entry **sym_hashes;
453 bfd_signed_vma *local_got_refcounts;
454 const Elf_Internal_Rela *rel;
455 const Elf_Internal_Rela *rel_end;
456 asection *sgot;
457 asection *srelgot;
458 asection *sreloc;
459
460 if (info->relocateable)
461 return true;
462
463 dynobj = elf_hash_table (info)->dynobj;
464 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
465 sym_hashes = elf_sym_hashes (abfd);
466 local_got_refcounts = elf_local_got_refcounts (abfd);
467
468 sgot = NULL;
469 srelgot = NULL;
470 sreloc = NULL;
471
472 rel_end = relocs + sec->reloc_count;
473 for (rel = relocs; rel < rel_end; rel++)
474 {
475 unsigned long r_symndx;
476 struct elf_link_hash_entry *h;
477
478 r_symndx = ELF32_R_SYM (rel->r_info);
479
480 if (r_symndx < symtab_hdr->sh_info)
481 h = NULL;
482 else
483 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
484
485 switch (ELF32_R_TYPE (rel->r_info))
486 {
487 case R_68K_GOT8:
488 case R_68K_GOT16:
489 case R_68K_GOT32:
490 if (h != NULL
491 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
492 break;
493 /* Fall through. */
494 case R_68K_GOT8O:
495 case R_68K_GOT16O:
496 case R_68K_GOT32O:
497 /* This symbol requires a global offset table entry. */
498
499 if (dynobj == NULL)
500 {
501 /* Create the .got section. */
502 elf_hash_table (info)->dynobj = dynobj = abfd;
503 if (!_bfd_elf_create_got_section (dynobj, info))
504 return false;
505 }
506
507 if (sgot == NULL)
508 {
509 sgot = bfd_get_section_by_name (dynobj, ".got");
510 BFD_ASSERT (sgot != NULL);
511 }
512
513 if (srelgot == NULL
514 && (h != NULL || info->shared))
515 {
516 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
517 if (srelgot == NULL)
518 {
519 srelgot = bfd_make_section (dynobj, ".rela.got");
520 if (srelgot == NULL
521 || !bfd_set_section_flags (dynobj, srelgot,
522 (SEC_ALLOC
523 | SEC_LOAD
524 | SEC_HAS_CONTENTS
525 | SEC_IN_MEMORY
526 | SEC_LINKER_CREATED
527 | SEC_READONLY))
528 || !bfd_set_section_alignment (dynobj, srelgot, 2))
529 return false;
530 }
531 }
532
533 if (h != NULL)
534 {
535 if (h->got.refcount == -1)
536 {
537 h->got.refcount = 1;
538
539 /* Make sure this symbol is output as a dynamic symbol. */
540 if (h->dynindx == -1)
541 {
542 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
543 return false;
544 }
545
546 /* Allocate space in the .got section. */
547 sgot->_raw_size += 4;
548 /* Allocate relocation space. */
549 srelgot->_raw_size += sizeof (Elf32_External_Rela);
550 }
551 else
552 h->got.refcount++;
553 }
554 else
555 {
556 /* This is a global offset table entry for a local symbol. */
557 if (local_got_refcounts == NULL)
558 {
559 size_t size;
560
561 size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
562 local_got_refcounts = ((bfd_signed_vma *)
563 bfd_alloc (abfd, size));
564 if (local_got_refcounts == NULL)
565 return false;
566 elf_local_got_refcounts (abfd) = local_got_refcounts;
567 memset (local_got_refcounts, -1, size);
568 }
569 if (local_got_refcounts[r_symndx] == -1)
570 {
571 local_got_refcounts[r_symndx] = 1;
572
573 sgot->_raw_size += 4;
574 if (info->shared)
575 {
576 /* If we are generating a shared object, we need to
577 output a R_68K_RELATIVE reloc so that the dynamic
578 linker can adjust this GOT entry. */
579 srelgot->_raw_size += sizeof (Elf32_External_Rela);
580 }
581 }
582 else
583 local_got_refcounts[r_symndx]++;
584 }
585 break;
586
587 case R_68K_PLT8:
588 case R_68K_PLT16:
589 case R_68K_PLT32:
590 /* This symbol requires a procedure linkage table entry. We
591 actually build the entry in adjust_dynamic_symbol,
592 because this might be a case of linking PIC code which is
593 never referenced by a dynamic object, in which case we
594 don't need to generate a procedure linkage table entry
595 after all. */
596
597 /* If this is a local symbol, we resolve it directly without
598 creating a procedure linkage table entry. */
599 if (h == NULL)
600 continue;
601
602 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
603 if (h->plt.refcount == -1)
604 h->plt.refcount = 1;
605 else
606 h->plt.refcount++;
607 break;
608
609 case R_68K_PLT8O:
610 case R_68K_PLT16O:
611 case R_68K_PLT32O:
612 /* This symbol requires a procedure linkage table entry. */
613
614 if (h == NULL)
615 {
616 /* It does not make sense to have this relocation for a
617 local symbol. FIXME: does it? How to handle it if
618 it does make sense? */
619 bfd_set_error (bfd_error_bad_value);
620 return false;
621 }
622
623 /* Make sure this symbol is output as a dynamic symbol. */
624 if (h->dynindx == -1)
625 {
626 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
627 return false;
628 }
629
630 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
631 if (h->plt.refcount == -1)
632 h->plt.refcount = 1;
633 else
634 h->plt.refcount++;
635 break;
636
637 case R_68K_PC8:
638 case R_68K_PC16:
639 case R_68K_PC32:
640 /* If we are creating a shared library and this is not a local
641 symbol, we need to copy the reloc into the shared library.
642 However when linking with -Bsymbolic and this is a global
643 symbol which is defined in an object we are including in the
644 link (i.e., DEF_REGULAR is set), then we can resolve the
645 reloc directly. At this point we have not seen all the input
646 files, so it is possible that DEF_REGULAR is not set now but
647 will be set later (it is never cleared). We account for that
648 possibility below by storing information in the
649 pcrel_relocs_copied field of the hash table entry. */
650 if (!(info->shared
651 && (sec->flags & SEC_ALLOC) != 0
652 && h != NULL
653 && (!info->symbolic
654 || (h->elf_link_hash_flags
655 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
656 {
657 if (h != NULL)
658 {
659 /* Make sure a plt entry is created for this symbol if
660 it turns out to be a function defined by a dynamic
661 object. */
662 if (h->plt.refcount == -1)
663 h->plt.refcount = 1;
664 else
665 h->plt.refcount++;
666 }
667 break;
668 }
669 /* Fall through. */
670 case R_68K_8:
671 case R_68K_16:
672 case R_68K_32:
673 if (h != NULL)
674 {
675 /* Make sure a plt entry is created for this symbol if it
676 turns out to be a function defined by a dynamic object. */
677 if (h->plt.refcount == -1)
678 h->plt.refcount = 1;
679 else
680 h->plt.refcount++;
681 }
682
683 /* If we are creating a shared library, we need to copy the
684 reloc into the shared library. */
685 if (info->shared
686 && (sec->flags & SEC_ALLOC) != 0)
687 {
688 /* When creating a shared object, we must copy these
689 reloc types into the output file. We create a reloc
690 section in dynobj and make room for this reloc. */
691 if (sreloc == NULL)
692 {
693 const char *name;
694
695 name = (bfd_elf_string_from_elf_section
696 (abfd,
697 elf_elfheader (abfd)->e_shstrndx,
698 elf_section_data (sec)->rel_hdr.sh_name));
699 if (name == NULL)
700 return false;
701
702 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
703 && strcmp (bfd_get_section_name (abfd, sec),
704 name + 5) == 0);
705
706 sreloc = bfd_get_section_by_name (dynobj, name);
707 if (sreloc == NULL)
708 {
709 sreloc = bfd_make_section (dynobj, name);
710 if (sreloc == NULL
711 || !bfd_set_section_flags (dynobj, sreloc,
712 (SEC_ALLOC
713 | SEC_LOAD
714 | SEC_HAS_CONTENTS
715 | SEC_IN_MEMORY
716 | SEC_LINKER_CREATED
717 | SEC_READONLY))
718 || !bfd_set_section_alignment (dynobj, sreloc, 2))
719 return false;
720 }
721 }
722
723 sreloc->_raw_size += sizeof (Elf32_External_Rela);
724
725 /* If we are linking with -Bsymbolic, we count the number of
726 PC relative relocations we have entered for this symbol,
727 so that we can discard them again if the symbol is later
728 defined by a regular object. Note that this function is
729 only called if we are using an m68kelf linker hash table,
730 which means that h is really a pointer to an
731 elf_m68k_link_hash_entry. */
732 if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8
733 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
734 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
735 && info->symbolic)
736 {
737 struct elf_m68k_link_hash_entry *eh;
738 struct elf_m68k_pcrel_relocs_copied *p;
739
740 eh = (struct elf_m68k_link_hash_entry *) h;
741
742 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
743 if (p->section == sreloc)
744 break;
745
746 if (p == NULL)
747 {
748 p = ((struct elf_m68k_pcrel_relocs_copied *)
749 bfd_alloc (dynobj, sizeof *p));
750 if (p == NULL)
751 return false;
752 p->next = eh->pcrel_relocs_copied;
753 eh->pcrel_relocs_copied = p;
754 p->section = sreloc;
755 p->count = 0;
756 }
757
758 ++p->count;
759 }
760 }
761
762 break;
763
764 /* This relocation describes the C++ object vtable hierarchy.
765 Reconstruct it for later use during GC. */
766 case R_68K_GNU_VTINHERIT:
767 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
768 return false;
769 break;
770
771 /* This relocation describes which C++ vtable entries are actually
772 used. Record for later use during GC. */
773 case R_68K_GNU_VTENTRY:
774 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
775 return false;
776 break;
777
778 default:
779 break;
780 }
781 }
782
783 return true;
784 }
785
786 /* Return the section that should be marked against GC for a given
787 relocation. */
788
789 static asection *
790 elf_m68k_gc_mark_hook (abfd, info, rel, h, sym)
791 bfd *abfd;
792 struct bfd_link_info *info ATTRIBUTE_UNUSED;
793 Elf_Internal_Rela *rel;
794 struct elf_link_hash_entry *h;
795 Elf_Internal_Sym *sym;
796 {
797 if (h != NULL)
798 {
799 switch (ELF32_R_TYPE (rel->r_info))
800 {
801 case R_68K_GNU_VTINHERIT:
802 case R_68K_GNU_VTENTRY:
803 break;
804
805 default:
806 switch (h->root.type)
807 {
808 default:
809 break;
810
811 case bfd_link_hash_defined:
812 case bfd_link_hash_defweak:
813 return h->root.u.def.section;
814
815 case bfd_link_hash_common:
816 return h->root.u.c.p->section;
817 }
818 }
819 }
820 else
821 {
822 if (!(elf_bad_symtab (abfd)
823 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
824 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
825 && sym->st_shndx != SHN_COMMON))
826 {
827 return bfd_section_from_elf_index (abfd, sym->st_shndx);
828 }
829 }
830
831 return NULL;
832 }
833
834 /* Update the got entry reference counts for the section being removed. */
835
836 static boolean
837 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
838 bfd *abfd;
839 struct bfd_link_info *info;
840 asection *sec;
841 const Elf_Internal_Rela *relocs;
842 {
843 Elf_Internal_Shdr *symtab_hdr;
844 struct elf_link_hash_entry **sym_hashes;
845 bfd_signed_vma *local_got_refcounts;
846 const Elf_Internal_Rela *rel, *relend;
847 unsigned long r_symndx;
848 struct elf_link_hash_entry *h;
849 bfd *dynobj;
850 asection *sgot;
851 asection *srelgot;
852
853 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
854 sym_hashes = elf_sym_hashes (abfd);
855 local_got_refcounts = elf_local_got_refcounts (abfd);
856
857 dynobj = elf_hash_table (info)->dynobj;
858 if (dynobj == NULL)
859 return true;
860
861 sgot = bfd_get_section_by_name (dynobj, ".got");
862 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
863
864 relend = relocs + sec->reloc_count;
865 for (rel = relocs; rel < relend; rel++)
866 {
867 switch (ELF32_R_TYPE (rel->r_info))
868 {
869 case R_68K_GOT8:
870 case R_68K_GOT16:
871 case R_68K_GOT32:
872 case R_68K_GOT8O:
873 case R_68K_GOT16O:
874 case R_68K_GOT32O:
875 r_symndx = ELF32_R_SYM (rel->r_info);
876 if (r_symndx >= symtab_hdr->sh_info)
877 {
878 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
879 if (h->got.refcount > 0)
880 {
881 --h->got.refcount;
882 if (h->got.refcount == 0)
883 {
884 /* We don't need the .got entry any more. */
885 sgot->_raw_size -= 4;
886 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
887 }
888 }
889 }
890 else if (local_got_refcounts != NULL)
891 {
892 if (local_got_refcounts[r_symndx] > 0)
893 {
894 --local_got_refcounts[r_symndx];
895 if (local_got_refcounts[r_symndx] == 0)
896 {
897 /* We don't need the .got entry any more. */
898 sgot->_raw_size -= 4;
899 if (info->shared)
900 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
901 }
902 }
903 }
904 break;
905
906 case R_68K_PLT8:
907 case R_68K_PLT16:
908 case R_68K_PLT32:
909 case R_68K_PLT8O:
910 case R_68K_PLT16O:
911 case R_68K_PLT32O:
912 case R_68K_PC8:
913 case R_68K_PC16:
914 case R_68K_PC32:
915 case R_68K_8:
916 case R_68K_16:
917 case R_68K_32:
918 r_symndx = ELF32_R_SYM (rel->r_info);
919 if (r_symndx >= symtab_hdr->sh_info)
920 {
921 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
922 if (h->plt.refcount > 0)
923 --h->plt.refcount;
924 }
925 break;
926
927 default:
928 break;
929 }
930 }
931
932 return true;
933 }
934
935 /* Adjust a symbol defined by a dynamic object and referenced by a
936 regular object. The current definition is in some section of the
937 dynamic object, but we're not including those sections. We have to
938 change the definition to something the rest of the link can
939 understand. */
940
941 static boolean
942 elf_m68k_adjust_dynamic_symbol (info, h)
943 struct bfd_link_info *info;
944 struct elf_link_hash_entry *h;
945 {
946 bfd *dynobj;
947 asection *s;
948 unsigned int power_of_two;
949
950 dynobj = elf_hash_table (info)->dynobj;
951
952 /* Make sure we know what is going on here. */
953 BFD_ASSERT (dynobj != NULL
954 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
955 || h->weakdef != NULL
956 || ((h->elf_link_hash_flags
957 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
958 && (h->elf_link_hash_flags
959 & ELF_LINK_HASH_REF_REGULAR) != 0
960 && (h->elf_link_hash_flags
961 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
962
963 /* If this is a function, put it in the procedure linkage table. We
964 will fill in the contents of the procedure linkage table later,
965 when we know the address of the .got section. */
966 if (h->type == STT_FUNC
967 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
968 {
969 if (! info->shared
970 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
971 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
972 /* We must always create the plt entry if it was referenced
973 by a PLTxxO relocation. In this case we already recorded
974 it as a dynamic symbol. */
975 && h->dynindx == -1)
976 {
977 /* This case can occur if we saw a PLTxx reloc in an input
978 file, but the symbol was never referred to by a dynamic
979 object. In such a case, we don't actually need to build
980 a procedure linkage table, and we can just do a PCxx
981 reloc instead. */
982 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
983 h->plt.offset = (bfd_vma) -1;
984 return true;
985 }
986
987 /* GC may have rendered this entry unused. */
988 if (h->plt.refcount <= 0)
989 {
990 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
991 h->plt.offset = (bfd_vma) -1;
992 return true;
993 }
994
995 /* Make sure this symbol is output as a dynamic symbol. */
996 if (h->dynindx == -1)
997 {
998 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
999 return false;
1000 }
1001
1002 s = bfd_get_section_by_name (dynobj, ".plt");
1003 BFD_ASSERT (s != NULL);
1004
1005 /* If this is the first .plt entry, make room for the special
1006 first entry. */
1007 if (s->_raw_size == 0)
1008 {
1009 if (CPU32_FLAG (dynobj))
1010 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1011 else
1012 s->_raw_size += PLT_ENTRY_SIZE;
1013 }
1014
1015 /* If this symbol is not defined in a regular file, and we are
1016 not generating a shared library, then set the symbol to this
1017 location in the .plt. This is required to make function
1018 pointers compare as equal between the normal executable and
1019 the shared library. */
1020 if (!info->shared
1021 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1022 {
1023 h->root.u.def.section = s;
1024 h->root.u.def.value = s->_raw_size;
1025 }
1026
1027 h->plt.offset = s->_raw_size;
1028
1029 /* Make room for this entry. */
1030 if (CPU32_FLAG (dynobj))
1031 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1032 else
1033 s->_raw_size += PLT_ENTRY_SIZE;
1034
1035 /* We also need to make an entry in the .got.plt section, which
1036 will be placed in the .got section by the linker script. */
1037
1038 s = bfd_get_section_by_name (dynobj, ".got.plt");
1039 BFD_ASSERT (s != NULL);
1040 s->_raw_size += 4;
1041
1042 /* We also need to make an entry in the .rela.plt section. */
1043
1044 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1045 BFD_ASSERT (s != NULL);
1046 s->_raw_size += sizeof (Elf32_External_Rela);
1047
1048 return true;
1049 }
1050
1051 /* Reinitialize the plt offset now that it is not used as a reference
1052 count any more. */
1053 h->plt.offset = (bfd_vma) -1;
1054
1055 /* If this is a weak symbol, and there is a real definition, the
1056 processor independent code will have arranged for us to see the
1057 real definition first, and we can just use the same value. */
1058 if (h->weakdef != NULL)
1059 {
1060 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1061 || h->weakdef->root.type == bfd_link_hash_defweak);
1062 h->root.u.def.section = h->weakdef->root.u.def.section;
1063 h->root.u.def.value = h->weakdef->root.u.def.value;
1064 return true;
1065 }
1066
1067 /* This is a reference to a symbol defined by a dynamic object which
1068 is not a function. */
1069
1070 /* If we are creating a shared library, we must presume that the
1071 only references to the symbol are via the global offset table.
1072 For such cases we need not do anything here; the relocations will
1073 be handled correctly by relocate_section. */
1074 if (info->shared)
1075 return true;
1076
1077 /* We must allocate the symbol in our .dynbss section, which will
1078 become part of the .bss section of the executable. There will be
1079 an entry for this symbol in the .dynsym section. The dynamic
1080 object will contain position independent code, so all references
1081 from the dynamic object to this symbol will go through the global
1082 offset table. The dynamic linker will use the .dynsym entry to
1083 determine the address it must put in the global offset table, so
1084 both the dynamic object and the regular object will refer to the
1085 same memory location for the variable. */
1086
1087 s = bfd_get_section_by_name (dynobj, ".dynbss");
1088 BFD_ASSERT (s != NULL);
1089
1090 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1091 copy the initial value out of the dynamic object and into the
1092 runtime process image. We need to remember the offset into the
1093 .rela.bss section we are going to use. */
1094 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1095 {
1096 asection *srel;
1097
1098 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1099 BFD_ASSERT (srel != NULL);
1100 srel->_raw_size += sizeof (Elf32_External_Rela);
1101 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1102 }
1103
1104 /* We need to figure out the alignment required for this symbol. I
1105 have no idea how ELF linkers handle this. */
1106 power_of_two = bfd_log2 (h->size);
1107 if (power_of_two > 3)
1108 power_of_two = 3;
1109
1110 /* Apply the required alignment. */
1111 s->_raw_size = BFD_ALIGN (s->_raw_size,
1112 (bfd_size_type) (1 << power_of_two));
1113 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1114 {
1115 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1116 return false;
1117 }
1118
1119 /* Define the symbol as being at this point in the section. */
1120 h->root.u.def.section = s;
1121 h->root.u.def.value = s->_raw_size;
1122
1123 /* Increment the section size to make room for the symbol. */
1124 s->_raw_size += h->size;
1125
1126 return true;
1127 }
1128
1129 /* Set the sizes of the dynamic sections. */
1130
1131 static boolean
1132 elf_m68k_size_dynamic_sections (output_bfd, info)
1133 bfd *output_bfd;
1134 struct bfd_link_info *info;
1135 {
1136 bfd *dynobj;
1137 asection *s;
1138 boolean plt;
1139 boolean relocs;
1140 boolean reltext;
1141
1142 dynobj = elf_hash_table (info)->dynobj;
1143 BFD_ASSERT (dynobj != NULL);
1144
1145 if (elf_hash_table (info)->dynamic_sections_created)
1146 {
1147 /* Set the contents of the .interp section to the interpreter. */
1148 if (!info->shared)
1149 {
1150 s = bfd_get_section_by_name (dynobj, ".interp");
1151 BFD_ASSERT (s != NULL);
1152 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1153 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1154 }
1155 }
1156 else
1157 {
1158 /* We may have created entries in the .rela.got section.
1159 However, if we are not creating the dynamic sections, we will
1160 not actually use these entries. Reset the size of .rela.got,
1161 which will cause it to get stripped from the output file
1162 below. */
1163 s = bfd_get_section_by_name (dynobj, ".rela.got");
1164 if (s != NULL)
1165 s->_raw_size = 0;
1166 }
1167
1168 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1169 relative relocs against symbols defined in a regular object. We
1170 allocated space for them in the check_relocs routine, but we will not
1171 fill them in in the relocate_section routine. */
1172 if (info->shared && info->symbolic)
1173 elf_m68k_link_hash_traverse (elf_m68k_hash_table (info),
1174 elf_m68k_discard_copies,
1175 (PTR) NULL);
1176
1177 /* The check_relocs and adjust_dynamic_symbol entry points have
1178 determined the sizes of the various dynamic sections. Allocate
1179 memory for them. */
1180 plt = false;
1181 relocs = false;
1182 reltext = false;
1183 for (s = dynobj->sections; s != NULL; s = s->next)
1184 {
1185 const char *name;
1186 boolean strip;
1187
1188 if ((s->flags & SEC_LINKER_CREATED) == 0)
1189 continue;
1190
1191 /* It's OK to base decisions on the section name, because none
1192 of the dynobj section names depend upon the input files. */
1193 name = bfd_get_section_name (dynobj, s);
1194
1195 strip = false;
1196
1197 if (strcmp (name, ".plt") == 0)
1198 {
1199 if (s->_raw_size == 0)
1200 {
1201 /* Strip this section if we don't need it; see the
1202 comment below. */
1203 strip = true;
1204 }
1205 else
1206 {
1207 /* Remember whether there is a PLT. */
1208 plt = true;
1209 }
1210 }
1211 else if (strncmp (name, ".rela", 5) == 0)
1212 {
1213 if (s->_raw_size == 0)
1214 {
1215 /* If we don't need this section, strip it from the
1216 output file. This is mostly to handle .rela.bss and
1217 .rela.plt. We must create both sections in
1218 create_dynamic_sections, because they must be created
1219 before the linker maps input sections to output
1220 sections. The linker does that before
1221 adjust_dynamic_symbol is called, and it is that
1222 function which decides whether anything needs to go
1223 into these sections. */
1224 strip = true;
1225 }
1226 else
1227 {
1228 asection *target;
1229
1230 /* Remember whether there are any reloc sections other
1231 than .rela.plt. */
1232 if (strcmp (name, ".rela.plt") != 0)
1233 {
1234 const char *outname;
1235
1236 relocs = true;
1237
1238 /* If this relocation section applies to a read only
1239 section, then we probably need a DT_TEXTREL
1240 entry. .rela.plt is actually associated with
1241 .got.plt, which is never readonly. */
1242 outname = bfd_get_section_name (output_bfd,
1243 s->output_section);
1244 target = bfd_get_section_by_name (output_bfd, outname + 5);
1245 if (target != NULL
1246 && (target->flags & SEC_READONLY) != 0
1247 && (target->flags & SEC_ALLOC) != 0)
1248 reltext = true;
1249 }
1250
1251 /* We use the reloc_count field as a counter if we need
1252 to copy relocs into the output file. */
1253 s->reloc_count = 0;
1254 }
1255 }
1256 else if (strncmp (name, ".got", 4) != 0)
1257 {
1258 /* It's not one of our sections, so don't allocate space. */
1259 continue;
1260 }
1261
1262 if (strip)
1263 {
1264 _bfd_strip_section_from_output (info, s);
1265 continue;
1266 }
1267
1268 /* Allocate memory for the section contents. */
1269 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1270 Unused entries should be reclaimed before the section's contents
1271 are written out, but at the moment this does not happen. Thus in
1272 order to prevent writing out garbage, we initialise the section's
1273 contents to zero. */
1274 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1275 if (s->contents == NULL && s->_raw_size != 0)
1276 return false;
1277 }
1278
1279 if (elf_hash_table (info)->dynamic_sections_created)
1280 {
1281 /* Add some entries to the .dynamic section. We fill in the
1282 values later, in elf_m68k_finish_dynamic_sections, but we
1283 must add the entries now so that we get the correct size for
1284 the .dynamic section. The DT_DEBUG entry is filled in by the
1285 dynamic linker and used by the debugger. */
1286 if (!info->shared)
1287 {
1288 if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
1289 return false;
1290 }
1291
1292 if (plt)
1293 {
1294 if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
1295 || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
1296 || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
1297 || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
1298 return false;
1299 }
1300
1301 if (relocs)
1302 {
1303 if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
1304 || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
1305 || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
1306 sizeof (Elf32_External_Rela)))
1307 return false;
1308 }
1309
1310 if (reltext)
1311 {
1312 if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
1313 return false;
1314 info->flags |= DF_TEXTREL;
1315 }
1316 }
1317
1318 return true;
1319 }
1320
1321 /* This function is called via elf_m68k_link_hash_traverse if we are
1322 creating a shared object with -Bsymbolic. It discards the space
1323 allocated to copy PC relative relocs against symbols which are defined
1324 in regular objects. We allocated space for them in the check_relocs
1325 routine, but we won't fill them in in the relocate_section routine. */
1326
1327 static boolean
1328 elf_m68k_discard_copies (h, ignore)
1329 struct elf_m68k_link_hash_entry *h;
1330 PTR ignore ATTRIBUTE_UNUSED;
1331 {
1332 struct elf_m68k_pcrel_relocs_copied *s;
1333
1334 /* We only discard relocs for symbols defined in a regular object. */
1335 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1336 return true;
1337
1338 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1339 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1340
1341 return true;
1342 }
1343
1344 /* Relocate an M68K ELF section. */
1345
1346 static boolean
1347 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1348 contents, relocs, local_syms, local_sections)
1349 bfd *output_bfd;
1350 struct bfd_link_info *info;
1351 bfd *input_bfd;
1352 asection *input_section;
1353 bfd_byte *contents;
1354 Elf_Internal_Rela *relocs;
1355 Elf_Internal_Sym *local_syms;
1356 asection **local_sections;
1357 {
1358 bfd *dynobj;
1359 Elf_Internal_Shdr *symtab_hdr;
1360 struct elf_link_hash_entry **sym_hashes;
1361 bfd_vma *local_got_offsets;
1362 asection *sgot;
1363 asection *splt;
1364 asection *sreloc;
1365 Elf_Internal_Rela *rel;
1366 Elf_Internal_Rela *relend;
1367
1368 dynobj = elf_hash_table (info)->dynobj;
1369 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1370 sym_hashes = elf_sym_hashes (input_bfd);
1371 local_got_offsets = elf_local_got_offsets (input_bfd);
1372
1373 sgot = NULL;
1374 splt = NULL;
1375 sreloc = NULL;
1376
1377 rel = relocs;
1378 relend = relocs + input_section->reloc_count;
1379 for (; rel < relend; rel++)
1380 {
1381 int r_type;
1382 reloc_howto_type *howto;
1383 unsigned long r_symndx;
1384 struct elf_link_hash_entry *h;
1385 Elf_Internal_Sym *sym;
1386 asection *sec;
1387 bfd_vma relocation;
1388 bfd_reloc_status_type r;
1389
1390 r_type = ELF32_R_TYPE (rel->r_info);
1391 if (r_type < 0 || r_type >= (int) R_68K_max)
1392 {
1393 bfd_set_error (bfd_error_bad_value);
1394 return false;
1395 }
1396 howto = howto_table + r_type;
1397
1398 r_symndx = ELF32_R_SYM (rel->r_info);
1399
1400 if (info->relocateable)
1401 {
1402 /* This is a relocateable link. We don't have to change
1403 anything, unless the reloc is against a section symbol,
1404 in which case we have to adjust according to where the
1405 section symbol winds up in the output section. */
1406 if (r_symndx < symtab_hdr->sh_info)
1407 {
1408 sym = local_syms + r_symndx;
1409 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1410 {
1411 sec = local_sections[r_symndx];
1412 rel->r_addend += sec->output_offset + sym->st_value;
1413 }
1414 }
1415
1416 continue;
1417 }
1418
1419 /* This is a final link. */
1420 h = NULL;
1421 sym = NULL;
1422 sec = NULL;
1423 if (r_symndx < symtab_hdr->sh_info)
1424 {
1425 sym = local_syms + r_symndx;
1426 sec = local_sections[r_symndx];
1427 relocation = (sec->output_section->vma
1428 + sec->output_offset
1429 + sym->st_value);
1430 }
1431 else
1432 {
1433 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1434 while (h->root.type == bfd_link_hash_indirect
1435 || h->root.type == bfd_link_hash_warning)
1436 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1437 if (h->root.type == bfd_link_hash_defined
1438 || h->root.type == bfd_link_hash_defweak)
1439 {
1440 sec = h->root.u.def.section;
1441 if (((r_type == R_68K_PLT8
1442 || r_type == R_68K_PLT16
1443 || r_type == R_68K_PLT32
1444 || r_type == R_68K_PLT8O
1445 || r_type == R_68K_PLT16O
1446 || r_type == R_68K_PLT32O)
1447 && h->plt.offset != (bfd_vma) -1
1448 && elf_hash_table (info)->dynamic_sections_created)
1449 || ((r_type == R_68K_GOT8O
1450 || r_type == R_68K_GOT16O
1451 || r_type == R_68K_GOT32O
1452 || ((r_type == R_68K_GOT8
1453 || r_type == R_68K_GOT16
1454 || r_type == R_68K_GOT32)
1455 && strcmp (h->root.root.string,
1456 "_GLOBAL_OFFSET_TABLE_") != 0))
1457 && elf_hash_table (info)->dynamic_sections_created
1458 && (! info->shared
1459 || (! info->symbolic && h->dynindx != -1)
1460 || (h->elf_link_hash_flags
1461 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1462 || (info->shared
1463 && ((! info->symbolic && h->dynindx != -1)
1464 || (h->elf_link_hash_flags
1465 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1466 && (input_section->flags & SEC_ALLOC) != 0
1467 && (r_type == R_68K_8
1468 || r_type == R_68K_16
1469 || r_type == R_68K_32
1470 || r_type == R_68K_PC8
1471 || r_type == R_68K_PC16
1472 || r_type == R_68K_PC32)))
1473 {
1474 /* In these cases, we don't need the relocation
1475 value. We check specially because in some
1476 obscure cases sec->output_section will be NULL. */
1477 relocation = 0;
1478 }
1479 else
1480 relocation = (h->root.u.def.value
1481 + sec->output_section->vma
1482 + sec->output_offset);
1483 }
1484 else if (h->root.type == bfd_link_hash_undefweak)
1485 relocation = 0;
1486 else if (info->shared && !info->symbolic
1487 && !info->no_undefined
1488 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1489 relocation = 0;
1490 else
1491 {
1492 if (!(info->callbacks->undefined_symbol
1493 (info, h->root.root.string, input_bfd,
1494 input_section, rel->r_offset,
1495 (!info->shared || info->no_undefined
1496 || ELF_ST_VISIBILITY (h->other)))))
1497 return false;
1498 relocation = 0;
1499 }
1500 }
1501
1502 switch (r_type)
1503 {
1504 case R_68K_GOT8:
1505 case R_68K_GOT16:
1506 case R_68K_GOT32:
1507 /* Relocation is to the address of the entry for this symbol
1508 in the global offset table. */
1509 if (h != NULL
1510 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1511 break;
1512 /* Fall through. */
1513 case R_68K_GOT8O:
1514 case R_68K_GOT16O:
1515 case R_68K_GOT32O:
1516 /* Relocation is the offset of the entry for this symbol in
1517 the global offset table. */
1518
1519 {
1520 bfd_vma off;
1521
1522 if (sgot == NULL)
1523 {
1524 sgot = bfd_get_section_by_name (dynobj, ".got");
1525 BFD_ASSERT (sgot != NULL);
1526 }
1527
1528 if (h != NULL)
1529 {
1530 off = h->got.offset;
1531 BFD_ASSERT (off != (bfd_vma) -1);
1532
1533 if (!elf_hash_table (info)->dynamic_sections_created
1534 || (info->shared
1535 && (info->symbolic || h->dynindx == -1)
1536 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1537 {
1538 /* This is actually a static link, or it is a
1539 -Bsymbolic link and the symbol is defined
1540 locally, or the symbol was forced to be local
1541 because of a version file.. We must initialize
1542 this entry in the global offset table. Since
1543 the offset must always be a multiple of 4, we
1544 use the least significant bit to record whether
1545 we have initialized it already.
1546
1547 When doing a dynamic link, we create a .rela.got
1548 relocation entry to initialize the value. This
1549 is done in the finish_dynamic_symbol routine. */
1550 if ((off & 1) != 0)
1551 off &= ~1;
1552 else
1553 {
1554 bfd_put_32 (output_bfd, relocation,
1555 sgot->contents + off);
1556 h->got.offset |= 1;
1557 }
1558 }
1559 }
1560 else
1561 {
1562 BFD_ASSERT (local_got_offsets != NULL
1563 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1564
1565 off = local_got_offsets[r_symndx];
1566
1567 /* The offset must always be a multiple of 4. We use
1568 the least significant bit to record whether we have
1569 already generated the necessary reloc. */
1570 if ((off & 1) != 0)
1571 off &= ~1;
1572 else
1573 {
1574 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1575
1576 if (info->shared)
1577 {
1578 asection *srelgot;
1579 Elf_Internal_Rela outrel;
1580
1581 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1582 BFD_ASSERT (srelgot != NULL);
1583
1584 outrel.r_offset = (sgot->output_section->vma
1585 + sgot->output_offset
1586 + off);
1587 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1588 outrel.r_addend = relocation;
1589 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1590 (((Elf32_External_Rela *)
1591 srelgot->contents)
1592 + srelgot->reloc_count));
1593 ++srelgot->reloc_count;
1594 }
1595
1596 local_got_offsets[r_symndx] |= 1;
1597 }
1598 }
1599
1600 relocation = sgot->output_offset + off;
1601 if (r_type == R_68K_GOT8O
1602 || r_type == R_68K_GOT16O
1603 || r_type == R_68K_GOT32O)
1604 {
1605 /* This relocation does not use the addend. */
1606 rel->r_addend = 0;
1607 }
1608 else
1609 relocation += sgot->output_section->vma;
1610 }
1611 break;
1612
1613 case R_68K_PLT8:
1614 case R_68K_PLT16:
1615 case R_68K_PLT32:
1616 /* Relocation is to the entry for this symbol in the
1617 procedure linkage table. */
1618
1619 /* Resolve a PLTxx reloc against a local symbol directly,
1620 without using the procedure linkage table. */
1621 if (h == NULL)
1622 break;
1623
1624 if (h->plt.offset == (bfd_vma) -1
1625 || !elf_hash_table (info)->dynamic_sections_created)
1626 {
1627 /* We didn't make a PLT entry for this symbol. This
1628 happens when statically linking PIC code, or when
1629 using -Bsymbolic. */
1630 break;
1631 }
1632
1633 if (splt == NULL)
1634 {
1635 splt = bfd_get_section_by_name (dynobj, ".plt");
1636 BFD_ASSERT (splt != NULL);
1637 }
1638
1639 relocation = (splt->output_section->vma
1640 + splt->output_offset
1641 + h->plt.offset);
1642 break;
1643
1644 case R_68K_PLT8O:
1645 case R_68K_PLT16O:
1646 case R_68K_PLT32O:
1647 /* Relocation is the offset of the entry for this symbol in
1648 the procedure linkage table. */
1649 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1650
1651 if (splt == NULL)
1652 {
1653 splt = bfd_get_section_by_name (dynobj, ".plt");
1654 BFD_ASSERT (splt != NULL);
1655 }
1656
1657 relocation = h->plt.offset;
1658
1659 /* This relocation does not use the addend. */
1660 rel->r_addend = 0;
1661
1662 break;
1663
1664 case R_68K_PC8:
1665 case R_68K_PC16:
1666 case R_68K_PC32:
1667 if (h == NULL)
1668 break;
1669 /* Fall through. */
1670 case R_68K_8:
1671 case R_68K_16:
1672 case R_68K_32:
1673 if (info->shared
1674 && (input_section->flags & SEC_ALLOC) != 0
1675 && ((r_type != R_68K_PC8
1676 && r_type != R_68K_PC16
1677 && r_type != R_68K_PC32)
1678 || (!info->symbolic
1679 || (h->elf_link_hash_flags
1680 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1681 {
1682 Elf_Internal_Rela outrel;
1683 boolean skip, relocate;
1684
1685 /* When generating a shared object, these relocations
1686 are copied into the output file to be resolved at run
1687 time. */
1688
1689 if (sreloc == NULL)
1690 {
1691 const char *name;
1692
1693 name = (bfd_elf_string_from_elf_section
1694 (input_bfd,
1695 elf_elfheader (input_bfd)->e_shstrndx,
1696 elf_section_data (input_section)->rel_hdr.sh_name));
1697 if (name == NULL)
1698 return false;
1699
1700 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1701 && strcmp (bfd_get_section_name (input_bfd,
1702 input_section),
1703 name + 5) == 0);
1704
1705 sreloc = bfd_get_section_by_name (dynobj, name);
1706 BFD_ASSERT (sreloc != NULL);
1707 }
1708
1709 skip = false;
1710
1711 if (elf_section_data (input_section)->stab_info == NULL)
1712 outrel.r_offset = rel->r_offset;
1713 else
1714 {
1715 bfd_vma off;
1716
1717 off = (_bfd_stab_section_offset
1718 (output_bfd, &elf_hash_table (info)->stab_info,
1719 input_section,
1720 &elf_section_data (input_section)->stab_info,
1721 rel->r_offset));
1722 if (off == (bfd_vma) -1)
1723 skip = true;
1724 outrel.r_offset = off;
1725 }
1726
1727 outrel.r_offset += (input_section->output_section->vma
1728 + input_section->output_offset);
1729
1730 if (skip)
1731 {
1732 memset (&outrel, 0, sizeof outrel);
1733 relocate = false;
1734 }
1735 /* h->dynindx may be -1 if the symbol was marked to
1736 become local. */
1737 else if (h != NULL
1738 && ((! info->symbolic && h->dynindx != -1)
1739 || (h->elf_link_hash_flags
1740 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1741 {
1742 BFD_ASSERT (h->dynindx != -1);
1743 relocate = false;
1744 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1745 outrel.r_addend = relocation + rel->r_addend;
1746 }
1747 else
1748 {
1749 if (r_type == R_68K_32)
1750 {
1751 relocate = true;
1752 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1753 outrel.r_addend = relocation + rel->r_addend;
1754 }
1755 else
1756 {
1757 long indx;
1758
1759 if (h == NULL)
1760 sec = local_sections[r_symndx];
1761 else
1762 {
1763 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1764 || (h->root.type
1765 == bfd_link_hash_defweak));
1766 sec = h->root.u.def.section;
1767 }
1768 if (sec != NULL && bfd_is_abs_section (sec))
1769 indx = 0;
1770 else if (sec == NULL || sec->owner == NULL)
1771 {
1772 bfd_set_error (bfd_error_bad_value);
1773 return false;
1774 }
1775 else
1776 {
1777 asection *osec;
1778
1779 osec = sec->output_section;
1780 indx = elf_section_data (osec)->dynindx;
1781 BFD_ASSERT (indx > 0);
1782 }
1783
1784 relocate = false;
1785 outrel.r_info = ELF32_R_INFO (indx, r_type);
1786 outrel.r_addend = relocation + rel->r_addend;
1787 }
1788 }
1789
1790 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1791 (((Elf32_External_Rela *)
1792 sreloc->contents)
1793 + sreloc->reloc_count));
1794 ++sreloc->reloc_count;
1795
1796 /* This reloc will be computed at runtime, so there's no
1797 need to do anything now, except for R_68K_32
1798 relocations that have been turned into
1799 R_68K_RELATIVE. */
1800 if (!relocate)
1801 continue;
1802 }
1803
1804 break;
1805
1806 case R_68K_GNU_VTINHERIT:
1807 case R_68K_GNU_VTENTRY:
1808 /* These are no-ops in the end. */
1809 continue;
1810
1811 default:
1812 break;
1813 }
1814
1815 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1816 contents, rel->r_offset,
1817 relocation, rel->r_addend);
1818
1819 if (r != bfd_reloc_ok)
1820 {
1821 switch (r)
1822 {
1823 default:
1824 case bfd_reloc_outofrange:
1825 abort ();
1826 case bfd_reloc_overflow:
1827 {
1828 const char *name;
1829
1830 if (h != NULL)
1831 name = h->root.root.string;
1832 else
1833 {
1834 name = bfd_elf_string_from_elf_section (input_bfd,
1835 symtab_hdr->sh_link,
1836 sym->st_name);
1837 if (name == NULL)
1838 return false;
1839 if (*name == '\0')
1840 name = bfd_section_name (input_bfd, sec);
1841 }
1842 if (!(info->callbacks->reloc_overflow
1843 (info, name, howto->name, (bfd_vma) 0,
1844 input_bfd, input_section, rel->r_offset)))
1845 return false;
1846 }
1847 break;
1848 }
1849 }
1850 }
1851
1852 return true;
1853 }
1854
1855 /* Finish up dynamic symbol handling. We set the contents of various
1856 dynamic sections here. */
1857
1858 static boolean
1859 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1860 bfd *output_bfd;
1861 struct bfd_link_info *info;
1862 struct elf_link_hash_entry *h;
1863 Elf_Internal_Sym *sym;
1864 {
1865 bfd *dynobj;
1866 int plt_off1, plt_off2, plt_off3;
1867
1868 dynobj = elf_hash_table (info)->dynobj;
1869
1870 if (h->plt.offset != (bfd_vma) -1)
1871 {
1872 asection *splt;
1873 asection *sgot;
1874 asection *srela;
1875 bfd_vma plt_index;
1876 bfd_vma got_offset;
1877 Elf_Internal_Rela rela;
1878
1879 /* This symbol has an entry in the procedure linkage table. Set
1880 it up. */
1881
1882 BFD_ASSERT (h->dynindx != -1);
1883
1884 splt = bfd_get_section_by_name (dynobj, ".plt");
1885 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1886 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1887 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1888
1889 /* Get the index in the procedure linkage table which
1890 corresponds to this symbol. This is the index of this symbol
1891 in all the symbols for which we are making plt entries. The
1892 first entry in the procedure linkage table is reserved. */
1893 if ( CPU32_FLAG (output_bfd))
1894 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1895 else
1896 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1897
1898 /* Get the offset into the .got table of the entry that
1899 corresponds to this function. Each .got entry is 4 bytes.
1900 The first three are reserved. */
1901 got_offset = (plt_index + 3) * 4;
1902
1903 if ( CPU32_FLAG (output_bfd))
1904 {
1905 /* Fill in the entry in the procedure linkage table. */
1906 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1907 PLT_CPU32_ENTRY_SIZE);
1908 plt_off1 = 4;
1909 plt_off2 = 12;
1910 plt_off3 = 18;
1911 }
1912 else
1913 {
1914 /* Fill in the entry in the procedure linkage table. */
1915 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1916 PLT_ENTRY_SIZE);
1917 plt_off1 = 4;
1918 plt_off2 = 10;
1919 plt_off3 = 16;
1920 }
1921
1922 /* The offset is relative to the first extension word. */
1923 bfd_put_32 (output_bfd,
1924 (sgot->output_section->vma
1925 + sgot->output_offset
1926 + got_offset
1927 - (splt->output_section->vma
1928 + h->plt.offset + 2)),
1929 splt->contents + h->plt.offset + plt_off1);
1930
1931 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1932 splt->contents + h->plt.offset + plt_off2);
1933 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1934 splt->contents + h->plt.offset + plt_off3);
1935
1936 /* Fill in the entry in the global offset table. */
1937 bfd_put_32 (output_bfd,
1938 (splt->output_section->vma
1939 + splt->output_offset
1940 + h->plt.offset
1941 + 8),
1942 sgot->contents + got_offset);
1943
1944 /* Fill in the entry in the .rela.plt section. */
1945 rela.r_offset = (sgot->output_section->vma
1946 + sgot->output_offset
1947 + got_offset);
1948 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1949 rela.r_addend = 0;
1950 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1951 ((Elf32_External_Rela *) srela->contents
1952 + plt_index));
1953
1954 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1955 {
1956 /* Mark the symbol as undefined, rather than as defined in
1957 the .plt section. Leave the value alone. */
1958 sym->st_shndx = SHN_UNDEF;
1959 }
1960 }
1961
1962 if (h->got.offset != (bfd_vma) -1)
1963 {
1964 asection *sgot;
1965 asection *srela;
1966 Elf_Internal_Rela rela;
1967
1968 /* This symbol has an entry in the global offset table. Set it
1969 up. */
1970
1971 sgot = bfd_get_section_by_name (dynobj, ".got");
1972 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1973 BFD_ASSERT (sgot != NULL && srela != NULL);
1974
1975 rela.r_offset = (sgot->output_section->vma
1976 + sgot->output_offset
1977 + (h->got.offset &~ 1));
1978
1979 /* If this is a -Bsymbolic link, and the symbol is defined
1980 locally, we just want to emit a RELATIVE reloc. Likewise if
1981 the symbol was forced to be local because of a version file.
1982 The entry in the global offset table will already have been
1983 initialized in the relocate_section function. */
1984 if (info->shared
1985 && (info->symbolic || h->dynindx == -1)
1986 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1987 {
1988 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1989 rela.r_addend = bfd_get_signed_32 (output_bfd,
1990 (sgot->contents
1991 + (h->got.offset & ~1)));
1992 }
1993 else
1994 {
1995 bfd_put_32 (output_bfd, (bfd_vma) 0,
1996 sgot->contents + (h->got.offset & ~1));
1997 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1998 rela.r_addend = 0;
1999 }
2000
2001 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2002 ((Elf32_External_Rela *) srela->contents
2003 + srela->reloc_count));
2004 ++srela->reloc_count;
2005 }
2006
2007 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2008 {
2009 asection *s;
2010 Elf_Internal_Rela rela;
2011
2012 /* This symbol needs a copy reloc. Set it up. */
2013
2014 BFD_ASSERT (h->dynindx != -1
2015 && (h->root.type == bfd_link_hash_defined
2016 || h->root.type == bfd_link_hash_defweak));
2017
2018 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2019 ".rela.bss");
2020 BFD_ASSERT (s != NULL);
2021
2022 rela.r_offset = (h->root.u.def.value
2023 + h->root.u.def.section->output_section->vma
2024 + h->root.u.def.section->output_offset);
2025 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
2026 rela.r_addend = 0;
2027 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2028 ((Elf32_External_Rela *) s->contents
2029 + s->reloc_count));
2030 ++s->reloc_count;
2031 }
2032
2033 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2034 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2035 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2036 sym->st_shndx = SHN_ABS;
2037
2038 return true;
2039 }
2040
2041 /* Finish up the dynamic sections. */
2042
2043 static boolean
2044 elf_m68k_finish_dynamic_sections (output_bfd, info)
2045 bfd *output_bfd;
2046 struct bfd_link_info *info;
2047 {
2048 bfd *dynobj;
2049 asection *sgot;
2050 asection *sdyn;
2051
2052 dynobj = elf_hash_table (info)->dynobj;
2053
2054 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2055 BFD_ASSERT (sgot != NULL);
2056 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2057
2058 if (elf_hash_table (info)->dynamic_sections_created)
2059 {
2060 asection *splt;
2061 Elf32_External_Dyn *dyncon, *dynconend;
2062
2063 splt = bfd_get_section_by_name (dynobj, ".plt");
2064 BFD_ASSERT (splt != NULL && sdyn != NULL);
2065
2066 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2067 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2068 for (; dyncon < dynconend; dyncon++)
2069 {
2070 Elf_Internal_Dyn dyn;
2071 const char *name;
2072 asection *s;
2073
2074 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2075
2076 switch (dyn.d_tag)
2077 {
2078 default:
2079 break;
2080
2081 case DT_PLTGOT:
2082 name = ".got";
2083 goto get_vma;
2084 case DT_JMPREL:
2085 name = ".rela.plt";
2086 get_vma:
2087 s = bfd_get_section_by_name (output_bfd, name);
2088 BFD_ASSERT (s != NULL);
2089 dyn.d_un.d_ptr = s->vma;
2090 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2091 break;
2092
2093 case DT_PLTRELSZ:
2094 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2095 BFD_ASSERT (s != NULL);
2096 if (s->_cooked_size != 0)
2097 dyn.d_un.d_val = s->_cooked_size;
2098 else
2099 dyn.d_un.d_val = s->_raw_size;
2100 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2101 break;
2102
2103 case DT_RELASZ:
2104 /* The procedure linkage table relocs (DT_JMPREL) should
2105 not be included in the overall relocs (DT_RELA).
2106 Therefore, we override the DT_RELASZ entry here to
2107 make it not include the JMPREL relocs. Since the
2108 linker script arranges for .rela.plt to follow all
2109 other relocation sections, we don't have to worry
2110 about changing the DT_RELA entry. */
2111 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2112 if (s != NULL)
2113 {
2114 if (s->_cooked_size != 0)
2115 dyn.d_un.d_val -= s->_cooked_size;
2116 else
2117 dyn.d_un.d_val -= s->_raw_size;
2118 }
2119 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2120 break;
2121 }
2122 }
2123
2124 /* Fill in the first entry in the procedure linkage table. */
2125 if (splt->_raw_size > 0)
2126 {
2127 if (!CPU32_FLAG (output_bfd))
2128 {
2129 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2130 bfd_put_32 (output_bfd,
2131 (sgot->output_section->vma
2132 + sgot->output_offset + 4
2133 - (splt->output_section->vma + 2)),
2134 splt->contents + 4);
2135 bfd_put_32 (output_bfd,
2136 (sgot->output_section->vma
2137 + sgot->output_offset + 8
2138 - (splt->output_section->vma + 10)),
2139 splt->contents + 12);
2140 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2141 = PLT_ENTRY_SIZE;
2142 }
2143 else /* cpu32 */
2144 {
2145 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2146 bfd_put_32 (output_bfd,
2147 (sgot->output_section->vma
2148 + sgot->output_offset + 4
2149 - (splt->output_section->vma + 2)),
2150 splt->contents + 4);
2151 bfd_put_32 (output_bfd,
2152 (sgot->output_section->vma
2153 + sgot->output_offset + 8
2154 - (splt->output_section->vma + 10)),
2155 splt->contents + 12);
2156 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2157 = PLT_CPU32_ENTRY_SIZE;
2158 }
2159 }
2160 }
2161
2162 /* Fill in the first three entries in the global offset table. */
2163 if (sgot->_raw_size > 0)
2164 {
2165 if (sdyn == NULL)
2166 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2167 else
2168 bfd_put_32 (output_bfd,
2169 sdyn->output_section->vma + sdyn->output_offset,
2170 sgot->contents);
2171 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2172 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2173 }
2174
2175 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2176
2177 return true;
2178 }
2179
2180 /* Given a .data section and a .emreloc in-memory section, store
2181 relocation information into the .emreloc section which can be
2182 used at runtime to relocate the section. This is called by the
2183 linker when the --embedded-relocs switch is used. This is called
2184 after the add_symbols entry point has been called for all the
2185 objects, and before the final_link entry point is called. */
2186
2187 boolean
2188 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2189 bfd *abfd;
2190 struct bfd_link_info *info;
2191 asection *datasec;
2192 asection *relsec;
2193 char **errmsg;
2194 {
2195 Elf_Internal_Shdr *symtab_hdr;
2196 Elf32_External_Sym *extsyms;
2197 Elf32_External_Sym *free_extsyms = NULL;
2198 Elf_Internal_Rela *internal_relocs;
2199 Elf_Internal_Rela *free_relocs = NULL;
2200 Elf_Internal_Rela *irel, *irelend;
2201 bfd_byte *p;
2202
2203 BFD_ASSERT (! info->relocateable);
2204
2205 *errmsg = NULL;
2206
2207 if (datasec->reloc_count == 0)
2208 return true;
2209
2210 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2211 /* Read this BFD's symbols if we haven't done so already, or get the cached
2212 copy if it exists. */
2213 if (symtab_hdr->contents != NULL)
2214 extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
2215 else
2216 {
2217 /* Go get them off disk. */
2218 if (info->keep_memory)
2219 extsyms = ((Elf32_External_Sym *)
2220 bfd_alloc (abfd, symtab_hdr->sh_size));
2221 else
2222 extsyms = ((Elf32_External_Sym *)
2223 bfd_malloc (symtab_hdr->sh_size));
2224 if (extsyms == NULL)
2225 goto error_return;
2226 if (! info->keep_memory)
2227 free_extsyms = extsyms;
2228 if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
2229 || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd)
2230 != symtab_hdr->sh_size))
2231 goto error_return;
2232 if (info->keep_memory)
2233 symtab_hdr->contents = extsyms;
2234 }
2235
2236 /* Get a copy of the native relocations. */
2237 internal_relocs = (_bfd_elf32_link_read_relocs
2238 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2239 info->keep_memory));
2240 if (internal_relocs == NULL)
2241 goto error_return;
2242 if (! info->keep_memory)
2243 free_relocs = internal_relocs;
2244
2245 relsec->contents = (bfd_byte *) bfd_alloc (abfd, datasec->reloc_count * 12);
2246 if (relsec->contents == NULL)
2247 goto error_return;
2248
2249 p = relsec->contents;
2250
2251 irelend = internal_relocs + datasec->reloc_count;
2252 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2253 {
2254 asection *targetsec;
2255
2256 /* We are going to write a four byte longword into the runtime
2257 reloc section. The longword will be the address in the data
2258 section which must be relocated. It is followed by the name
2259 of the target section NUL-padded or truncated to 8
2260 characters. */
2261
2262 /* We can only relocate absolute longword relocs at run time. */
2263 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2264 {
2265 *errmsg = _("unsupported reloc type");
2266 bfd_set_error (bfd_error_bad_value);
2267 goto error_return;
2268 }
2269
2270 /* Get the target section referred to by the reloc. */
2271 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2272 {
2273 Elf_Internal_Sym isym;
2274
2275 /* A local symbol. */
2276 bfd_elf32_swap_symbol_in (abfd,
2277 extsyms + ELF32_R_SYM (irel->r_info),
2278 &isym);
2279
2280 targetsec = bfd_section_from_elf_index (abfd, isym.st_shndx);
2281 }
2282 else
2283 {
2284 unsigned long indx;
2285 struct elf_link_hash_entry *h;
2286
2287 /* An external symbol. */
2288 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2289 h = elf_sym_hashes (abfd)[indx];
2290 BFD_ASSERT (h != NULL);
2291 if (h->root.type == bfd_link_hash_defined
2292 || h->root.type == bfd_link_hash_defweak)
2293 targetsec = h->root.u.def.section;
2294 else
2295 targetsec = NULL;
2296 }
2297
2298 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2299 memset (p + 4, 0, 8);
2300 if (targetsec != NULL)
2301 strncpy (p + 4, targetsec->output_section->name, 8);
2302 }
2303
2304 if (free_extsyms != NULL)
2305 free (free_extsyms);
2306 if (free_relocs != NULL)
2307 free (free_relocs);
2308 return true;
2309
2310 error_return:
2311 if (free_extsyms != NULL)
2312 free (free_extsyms);
2313 if (free_relocs != NULL)
2314 free (free_relocs);
2315 return false;
2316 }
2317
2318 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2319 #define TARGET_BIG_NAME "elf32-m68k"
2320 #define ELF_MACHINE_CODE EM_68K
2321 #define ELF_MAXPAGESIZE 0x2000
2322 #define elf_backend_create_dynamic_sections \
2323 _bfd_elf_create_dynamic_sections
2324 #define bfd_elf32_bfd_link_hash_table_create \
2325 elf_m68k_link_hash_table_create
2326 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2327
2328 #define elf_backend_check_relocs elf_m68k_check_relocs
2329 #define elf_backend_adjust_dynamic_symbol \
2330 elf_m68k_adjust_dynamic_symbol
2331 #define elf_backend_size_dynamic_sections \
2332 elf_m68k_size_dynamic_sections
2333 #define elf_backend_relocate_section elf_m68k_relocate_section
2334 #define elf_backend_finish_dynamic_symbol \
2335 elf_m68k_finish_dynamic_symbol
2336 #define elf_backend_finish_dynamic_sections \
2337 elf_m68k_finish_dynamic_sections
2338 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2339 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2340 #define bfd_elf32_bfd_copy_private_bfd_data \
2341 elf32_m68k_copy_private_bfd_data
2342 #define bfd_elf32_bfd_merge_private_bfd_data \
2343 elf32_m68k_merge_private_bfd_data
2344 #define bfd_elf32_bfd_set_private_flags \
2345 elf32_m68k_set_private_flags
2346 #define bfd_elf32_bfd_print_private_bfd_data \
2347 elf32_m68k_print_private_bfd_data
2348
2349 #define elf_backend_can_gc_sections 1
2350 #define elf_backend_want_got_plt 1
2351 #define elf_backend_plt_readonly 1
2352 #define elf_backend_want_plt_sym 0
2353 #define elf_backend_got_header_size 12
2354
2355 #include "elf32-target.h"
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