2002-04-04 Daniel Jacobowitz <drow@mvista.com>
[deliverable/binutils-gdb.git] / bfd / elf32-m68k.c
1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/m68k.h"
27
28 static reloc_howto_type *reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30 static void rtype_to_howto
31 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
32 static struct bfd_hash_entry *elf_m68k_link_hash_newfunc
33 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
34 static struct bfd_link_hash_table *elf_m68k_link_hash_table_create
35 PARAMS ((bfd *));
36 static boolean elf_m68k_check_relocs
37 PARAMS ((bfd *, struct bfd_link_info *, asection *,
38 const Elf_Internal_Rela *));
39 static asection *elf_m68k_gc_mark_hook
40 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
41 struct elf_link_hash_entry *, Elf_Internal_Sym *));
42 static boolean elf_m68k_gc_sweep_hook
43 PARAMS ((bfd *, struct bfd_link_info *, asection *,
44 const Elf_Internal_Rela *));
45 static boolean elf_m68k_adjust_dynamic_symbol
46 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
47 static boolean elf_m68k_size_dynamic_sections
48 PARAMS ((bfd *, struct bfd_link_info *));
49 static boolean elf_m68k_relocate_section
50 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
51 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
52 static boolean elf_m68k_finish_dynamic_symbol
53 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
54 Elf_Internal_Sym *));
55 static boolean elf_m68k_finish_dynamic_sections
56 PARAMS ((bfd *, struct bfd_link_info *));
57
58 static boolean elf32_m68k_set_private_flags
59 PARAMS ((bfd *, flagword));
60 static boolean elf32_m68k_merge_private_bfd_data
61 PARAMS ((bfd *, bfd *));
62 static boolean elf32_m68k_print_private_bfd_data
63 PARAMS ((bfd *, PTR));
64 static enum elf_reloc_type_class elf32_m68k_reloc_type_class
65 PARAMS ((const Elf_Internal_Rela *));
66
67 static reloc_howto_type howto_table[] = {
68 HOWTO(R_68K_NONE, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", false, 0, 0x00000000,false),
69 HOWTO(R_68K_32, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0, 0xffffffff,false),
70 HOWTO(R_68K_16, 0, 1,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0, 0x0000ffff,false),
71 HOWTO(R_68K_8, 0, 0, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0, 0x000000ff,false),
72 HOWTO(R_68K_PC32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", false, 0, 0xffffffff,true),
73 HOWTO(R_68K_PC16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0, 0x0000ffff,true),
74 HOWTO(R_68K_PC8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0, 0x000000ff,true),
75 HOWTO(R_68K_GOT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0, 0xffffffff,true),
76 HOWTO(R_68K_GOT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0, 0x0000ffff,true),
77 HOWTO(R_68K_GOT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0, 0x000000ff,true),
78 HOWTO(R_68K_GOT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0, 0xffffffff,false),
79 HOWTO(R_68K_GOT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0, 0x0000ffff,false),
80 HOWTO(R_68K_GOT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0, 0x000000ff,false),
81 HOWTO(R_68K_PLT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0, 0xffffffff,true),
82 HOWTO(R_68K_PLT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0, 0x0000ffff,true),
83 HOWTO(R_68K_PLT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0, 0x000000ff,true),
84 HOWTO(R_68K_PLT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0, 0xffffffff,false),
85 HOWTO(R_68K_PLT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0, 0x0000ffff,false),
86 HOWTO(R_68K_PLT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", false, 0, 0x000000ff,false),
87 HOWTO(R_68K_COPY, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", false, 0, 0xffffffff,false),
88 HOWTO(R_68K_GLOB_DAT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", false, 0, 0xffffffff,false),
89 HOWTO(R_68K_JMP_SLOT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", false, 0, 0xffffffff,false),
90 HOWTO(R_68K_RELATIVE, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", false, 0, 0xffffffff,false),
91 /* GNU extension to record C++ vtable hierarchy */
92 HOWTO (R_68K_GNU_VTINHERIT, /* type */
93 0, /* rightshift */
94 2, /* size (0 = byte, 1 = short, 2 = long) */
95 0, /* bitsize */
96 false, /* pc_relative */
97 0, /* bitpos */
98 complain_overflow_dont, /* complain_on_overflow */
99 NULL, /* special_function */
100 "R_68K_GNU_VTINHERIT", /* name */
101 false, /* partial_inplace */
102 0, /* src_mask */
103 0, /* dst_mask */
104 false),
105 /* GNU extension to record C++ vtable member usage */
106 HOWTO (R_68K_GNU_VTENTRY, /* type */
107 0, /* rightshift */
108 2, /* size (0 = byte, 1 = short, 2 = long) */
109 0, /* bitsize */
110 false, /* pc_relative */
111 0, /* bitpos */
112 complain_overflow_dont, /* complain_on_overflow */
113 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
114 "R_68K_GNU_VTENTRY", /* name */
115 false, /* partial_inplace */
116 0, /* src_mask */
117 0, /* dst_mask */
118 false),
119 };
120
121 static void
122 rtype_to_howto (abfd, cache_ptr, dst)
123 bfd *abfd ATTRIBUTE_UNUSED;
124 arelent *cache_ptr;
125 Elf_Internal_Rela *dst;
126 {
127 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max);
128 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
129 }
130
131 #define elf_info_to_howto rtype_to_howto
132
133 static const struct
134 {
135 bfd_reloc_code_real_type bfd_val;
136 int elf_val;
137 } reloc_map[] = {
138 { BFD_RELOC_NONE, R_68K_NONE },
139 { BFD_RELOC_32, R_68K_32 },
140 { BFD_RELOC_16, R_68K_16 },
141 { BFD_RELOC_8, R_68K_8 },
142 { BFD_RELOC_32_PCREL, R_68K_PC32 },
143 { BFD_RELOC_16_PCREL, R_68K_PC16 },
144 { BFD_RELOC_8_PCREL, R_68K_PC8 },
145 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 },
146 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 },
147 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 },
148 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O },
149 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O },
150 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O },
151 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 },
152 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 },
153 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 },
154 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O },
155 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O },
156 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O },
157 { BFD_RELOC_NONE, R_68K_COPY },
158 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT },
159 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT },
160 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE },
161 { BFD_RELOC_CTOR, R_68K_32 },
162 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT },
163 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY },
164 };
165
166 static reloc_howto_type *
167 reloc_type_lookup (abfd, code)
168 bfd *abfd ATTRIBUTE_UNUSED;
169 bfd_reloc_code_real_type code;
170 {
171 unsigned int i;
172 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
173 {
174 if (reloc_map[i].bfd_val == code)
175 return &howto_table[reloc_map[i].elf_val];
176 }
177 return 0;
178 }
179
180 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
181 #define ELF_ARCH bfd_arch_m68k
182 /* end code generated by elf.el */
183
184 #define USE_RELA
185 \f
186 /* Functions for the m68k ELF linker. */
187
188 /* The name of the dynamic interpreter. This is put in the .interp
189 section. */
190
191 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
192
193 /* The size in bytes of an entry in the procedure linkage table. */
194
195 #define PLT_ENTRY_SIZE 20
196
197 /* The first entry in a procedure linkage table looks like this. See
198 the SVR4 ABI m68k supplement to see how this works. */
199
200 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
201 {
202 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
203 0, 0, 0, 0, /* replaced with offset to .got + 4. */
204 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
205 0, 0, 0, 0, /* replaced with offset to .got + 8. */
206 0, 0, 0, 0 /* pad out to 20 bytes. */
207 };
208
209 /* Subsequent entries in a procedure linkage table look like this. */
210
211 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
212 {
213 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
214 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
215 0x2f, 0x3c, /* move.l #offset,-(%sp) */
216 0, 0, 0, 0, /* replaced with offset into relocation table. */
217 0x60, 0xff, /* bra.l .plt */
218 0, 0, 0, 0 /* replaced with offset to start of .plt. */
219 };
220
221 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
222
223 #define PLT_CPU32_ENTRY_SIZE 24
224 /* Procedure linkage table entries for the cpu32 */
225 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
226 {
227 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
228 0, 0, 0, 0, /* replaced with offset to .got + 4. */
229 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
230 0, 0, 0, 0, /* replace with offset to .got +8. */
231 0x4e, 0xd1, /* jmp %a1@ */
232 0, 0, 0, 0, /* pad out to 24 bytes. */
233 0, 0
234 };
235
236 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
237 {
238 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
239 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
240 0x4e, 0xd1, /* jmp %a1@ */
241 0x2f, 0x3c, /* move.l #offset,-(%sp) */
242 0, 0, 0, 0, /* replaced with offset into relocation table. */
243 0x60, 0xff, /* bra.l .plt */
244 0, 0, 0, 0, /* replaced with offset to start of .plt. */
245 0, 0
246 };
247
248 /* The m68k linker needs to keep track of the number of relocs that it
249 decides to copy in check_relocs for each symbol. This is so that it
250 can discard PC relative relocs if it doesn't need them when linking
251 with -Bsymbolic. We store the information in a field extending the
252 regular ELF linker hash table. */
253
254 /* This structure keeps track of the number of PC relative relocs we have
255 copied for a given symbol. */
256
257 struct elf_m68k_pcrel_relocs_copied
258 {
259 /* Next section. */
260 struct elf_m68k_pcrel_relocs_copied *next;
261 /* A section in dynobj. */
262 asection *section;
263 /* Number of relocs copied in this section. */
264 bfd_size_type count;
265 };
266
267 /* m68k ELF linker hash entry. */
268
269 struct elf_m68k_link_hash_entry
270 {
271 struct elf_link_hash_entry root;
272
273 /* Number of PC relative relocs copied for this symbol. */
274 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
275 };
276
277 /* m68k ELF linker hash table. */
278
279 struct elf_m68k_link_hash_table
280 {
281 struct elf_link_hash_table root;
282 };
283
284 /* Declare this now that the above structures are defined. */
285
286 static boolean elf_m68k_discard_copies
287 PARAMS ((struct elf_m68k_link_hash_entry *, PTR));
288
289 /* Traverse an m68k ELF linker hash table. */
290
291 #define elf_m68k_link_hash_traverse(table, func, info) \
292 (elf_link_hash_traverse \
293 (&(table)->root, \
294 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
295 (info)))
296
297 /* Get the m68k ELF linker hash table from a link_info structure. */
298
299 #define elf_m68k_hash_table(p) \
300 ((struct elf_m68k_link_hash_table *) (p)->hash)
301
302 /* Create an entry in an m68k ELF linker hash table. */
303
304 static struct bfd_hash_entry *
305 elf_m68k_link_hash_newfunc (entry, table, string)
306 struct bfd_hash_entry *entry;
307 struct bfd_hash_table *table;
308 const char *string;
309 {
310 struct elf_m68k_link_hash_entry *ret =
311 (struct elf_m68k_link_hash_entry *) entry;
312
313 /* Allocate the structure if it has not already been allocated by a
314 subclass. */
315 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
316 ret = ((struct elf_m68k_link_hash_entry *)
317 bfd_hash_allocate (table,
318 sizeof (struct elf_m68k_link_hash_entry)));
319 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
320 return (struct bfd_hash_entry *) ret;
321
322 /* Call the allocation method of the superclass. */
323 ret = ((struct elf_m68k_link_hash_entry *)
324 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
325 table, string));
326 if (ret != (struct elf_m68k_link_hash_entry *) NULL)
327 {
328 ret->pcrel_relocs_copied = NULL;
329 }
330
331 return (struct bfd_hash_entry *) ret;
332 }
333
334 /* Create an m68k ELF linker hash table. */
335
336 static struct bfd_link_hash_table *
337 elf_m68k_link_hash_table_create (abfd)
338 bfd *abfd;
339 {
340 struct elf_m68k_link_hash_table *ret;
341 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table);
342
343 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt);
344 if (ret == (struct elf_m68k_link_hash_table *) NULL)
345 return NULL;
346
347 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
348 elf_m68k_link_hash_newfunc))
349 {
350 free (ret);
351 return NULL;
352 }
353
354 return &ret->root.root;
355 }
356
357 /* Keep m68k-specific flags in the ELF header */
358 static boolean
359 elf32_m68k_set_private_flags (abfd, flags)
360 bfd *abfd;
361 flagword flags;
362 {
363 elf_elfheader (abfd)->e_flags = flags;
364 elf_flags_init (abfd) = true;
365 return true;
366 }
367
368 /* Merge backend specific data from an object file to the output
369 object file when linking. */
370 static boolean
371 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
372 bfd *ibfd;
373 bfd *obfd;
374 {
375 flagword out_flags;
376 flagword in_flags;
377
378 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
379 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
380 return true;
381
382 in_flags = elf_elfheader (ibfd)->e_flags;
383 out_flags = elf_elfheader (obfd)->e_flags;
384
385 if (!elf_flags_init (obfd))
386 {
387 elf_flags_init (obfd) = true;
388 elf_elfheader (obfd)->e_flags = in_flags;
389 }
390
391 return true;
392 }
393
394 /* Display the flags field */
395 static boolean
396 elf32_m68k_print_private_bfd_data (abfd, ptr)
397 bfd *abfd;
398 PTR ptr;
399 {
400 FILE *file = (FILE *) ptr;
401
402 BFD_ASSERT (abfd != NULL && ptr != NULL);
403
404 /* Print normal ELF private data. */
405 _bfd_elf_print_private_bfd_data (abfd, ptr);
406
407 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
408
409 /* xgettext:c-format */
410 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
411
412 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
413 fprintf (file, _(" [cpu32]"));
414
415 if (elf_elfheader (abfd)->e_flags & EF_M68000)
416 fprintf (file, _ (" [m68000]"));
417
418 fputc ('\n', file);
419
420 return true;
421 }
422 /* Look through the relocs for a section during the first phase, and
423 allocate space in the global offset table or procedure linkage
424 table. */
425
426 static boolean
427 elf_m68k_check_relocs (abfd, info, sec, relocs)
428 bfd *abfd;
429 struct bfd_link_info *info;
430 asection *sec;
431 const Elf_Internal_Rela *relocs;
432 {
433 bfd *dynobj;
434 Elf_Internal_Shdr *symtab_hdr;
435 struct elf_link_hash_entry **sym_hashes;
436 bfd_signed_vma *local_got_refcounts;
437 const Elf_Internal_Rela *rel;
438 const Elf_Internal_Rela *rel_end;
439 asection *sgot;
440 asection *srelgot;
441 asection *sreloc;
442
443 if (info->relocateable)
444 return true;
445
446 dynobj = elf_hash_table (info)->dynobj;
447 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
448 sym_hashes = elf_sym_hashes (abfd);
449 local_got_refcounts = elf_local_got_refcounts (abfd);
450
451 sgot = NULL;
452 srelgot = NULL;
453 sreloc = NULL;
454
455 rel_end = relocs + sec->reloc_count;
456 for (rel = relocs; rel < rel_end; rel++)
457 {
458 unsigned long r_symndx;
459 struct elf_link_hash_entry *h;
460
461 r_symndx = ELF32_R_SYM (rel->r_info);
462
463 if (r_symndx < symtab_hdr->sh_info)
464 h = NULL;
465 else
466 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
467
468 switch (ELF32_R_TYPE (rel->r_info))
469 {
470 case R_68K_GOT8:
471 case R_68K_GOT16:
472 case R_68K_GOT32:
473 if (h != NULL
474 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
475 break;
476 /* Fall through. */
477 case R_68K_GOT8O:
478 case R_68K_GOT16O:
479 case R_68K_GOT32O:
480 /* This symbol requires a global offset table entry. */
481
482 if (dynobj == NULL)
483 {
484 /* Create the .got section. */
485 elf_hash_table (info)->dynobj = dynobj = abfd;
486 if (!_bfd_elf_create_got_section (dynobj, info))
487 return false;
488 }
489
490 if (sgot == NULL)
491 {
492 sgot = bfd_get_section_by_name (dynobj, ".got");
493 BFD_ASSERT (sgot != NULL);
494 }
495
496 if (srelgot == NULL
497 && (h != NULL || info->shared))
498 {
499 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
500 if (srelgot == NULL)
501 {
502 srelgot = bfd_make_section (dynobj, ".rela.got");
503 if (srelgot == NULL
504 || !bfd_set_section_flags (dynobj, srelgot,
505 (SEC_ALLOC
506 | SEC_LOAD
507 | SEC_HAS_CONTENTS
508 | SEC_IN_MEMORY
509 | SEC_LINKER_CREATED
510 | SEC_READONLY))
511 || !bfd_set_section_alignment (dynobj, srelgot, 2))
512 return false;
513 }
514 }
515
516 if (h != NULL)
517 {
518 if (h->got.refcount == 0)
519 {
520 /* Make sure this symbol is output as a dynamic symbol. */
521 if (h->dynindx == -1)
522 {
523 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
524 return false;
525 }
526
527 /* Allocate space in the .got section. */
528 sgot->_raw_size += 4;
529 /* Allocate relocation space. */
530 srelgot->_raw_size += sizeof (Elf32_External_Rela);
531 }
532 h->got.refcount++;
533 }
534 else
535 {
536 /* This is a global offset table entry for a local symbol. */
537 if (local_got_refcounts == NULL)
538 {
539 bfd_size_type size;
540
541 size = symtab_hdr->sh_info;
542 size *= sizeof (bfd_signed_vma);
543 local_got_refcounts = ((bfd_signed_vma *)
544 bfd_zalloc (abfd, size));
545 if (local_got_refcounts == NULL)
546 return false;
547 elf_local_got_refcounts (abfd) = local_got_refcounts;
548 }
549 if (local_got_refcounts[r_symndx] == 0)
550 {
551 sgot->_raw_size += 4;
552 if (info->shared)
553 {
554 /* If we are generating a shared object, we need to
555 output a R_68K_RELATIVE reloc so that the dynamic
556 linker can adjust this GOT entry. */
557 srelgot->_raw_size += sizeof (Elf32_External_Rela);
558 }
559 }
560 local_got_refcounts[r_symndx]++;
561 }
562 break;
563
564 case R_68K_PLT8:
565 case R_68K_PLT16:
566 case R_68K_PLT32:
567 /* This symbol requires a procedure linkage table entry. We
568 actually build the entry in adjust_dynamic_symbol,
569 because this might be a case of linking PIC code which is
570 never referenced by a dynamic object, in which case we
571 don't need to generate a procedure linkage table entry
572 after all. */
573
574 /* If this is a local symbol, we resolve it directly without
575 creating a procedure linkage table entry. */
576 if (h == NULL)
577 continue;
578
579 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
580 h->plt.refcount++;
581 break;
582
583 case R_68K_PLT8O:
584 case R_68K_PLT16O:
585 case R_68K_PLT32O:
586 /* This symbol requires a procedure linkage table entry. */
587
588 if (h == NULL)
589 {
590 /* It does not make sense to have this relocation for a
591 local symbol. FIXME: does it? How to handle it if
592 it does make sense? */
593 bfd_set_error (bfd_error_bad_value);
594 return false;
595 }
596
597 /* Make sure this symbol is output as a dynamic symbol. */
598 if (h->dynindx == -1)
599 {
600 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
601 return false;
602 }
603
604 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
605 h->plt.refcount++;
606 break;
607
608 case R_68K_PC8:
609 case R_68K_PC16:
610 case R_68K_PC32:
611 /* If we are creating a shared library and this is not a local
612 symbol, we need to copy the reloc into the shared library.
613 However when linking with -Bsymbolic and this is a global
614 symbol which is defined in an object we are including in the
615 link (i.e., DEF_REGULAR is set), then we can resolve the
616 reloc directly. At this point we have not seen all the input
617 files, so it is possible that DEF_REGULAR is not set now but
618 will be set later (it is never cleared). We account for that
619 possibility below by storing information in the
620 pcrel_relocs_copied field of the hash table entry. */
621 if (!(info->shared
622 && (sec->flags & SEC_ALLOC) != 0
623 && h != NULL
624 && (!info->symbolic
625 || (h->elf_link_hash_flags
626 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
627 {
628 if (h != NULL)
629 {
630 /* Make sure a plt entry is created for this symbol if
631 it turns out to be a function defined by a dynamic
632 object. */
633 h->plt.refcount++;
634 }
635 break;
636 }
637 /* Fall through. */
638 case R_68K_8:
639 case R_68K_16:
640 case R_68K_32:
641 if (h != NULL)
642 {
643 /* Make sure a plt entry is created for this symbol if it
644 turns out to be a function defined by a dynamic object. */
645 h->plt.refcount++;
646 }
647
648 /* If we are creating a shared library, we need to copy the
649 reloc into the shared library. */
650 if (info->shared
651 && (sec->flags & SEC_ALLOC) != 0)
652 {
653 /* When creating a shared object, we must copy these
654 reloc types into the output file. We create a reloc
655 section in dynobj and make room for this reloc. */
656 if (sreloc == NULL)
657 {
658 const char *name;
659
660 name = (bfd_elf_string_from_elf_section
661 (abfd,
662 elf_elfheader (abfd)->e_shstrndx,
663 elf_section_data (sec)->rel_hdr.sh_name));
664 if (name == NULL)
665 return false;
666
667 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
668 && strcmp (bfd_get_section_name (abfd, sec),
669 name + 5) == 0);
670
671 sreloc = bfd_get_section_by_name (dynobj, name);
672 if (sreloc == NULL)
673 {
674 sreloc = bfd_make_section (dynobj, name);
675 if (sreloc == NULL
676 || !bfd_set_section_flags (dynobj, sreloc,
677 (SEC_ALLOC
678 | SEC_LOAD
679 | SEC_HAS_CONTENTS
680 | SEC_IN_MEMORY
681 | SEC_LINKER_CREATED
682 | SEC_READONLY))
683 || !bfd_set_section_alignment (dynobj, sreloc, 2))
684 return false;
685 }
686 if (sec->flags & SEC_READONLY)
687 info->flags |= DF_TEXTREL;
688 }
689
690 sreloc->_raw_size += sizeof (Elf32_External_Rela);
691
692 /* If we are linking with -Bsymbolic, we count the number of
693 PC relative relocations we have entered for this symbol,
694 so that we can discard them again if the symbol is later
695 defined by a regular object. Note that this function is
696 only called if we are using an m68kelf linker hash table,
697 which means that h is really a pointer to an
698 elf_m68k_link_hash_entry. */
699 if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8
700 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
701 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
702 && info->symbolic)
703 {
704 struct elf_m68k_link_hash_entry *eh;
705 struct elf_m68k_pcrel_relocs_copied *p;
706
707 eh = (struct elf_m68k_link_hash_entry *) h;
708
709 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
710 if (p->section == sreloc)
711 break;
712
713 if (p == NULL)
714 {
715 p = ((struct elf_m68k_pcrel_relocs_copied *)
716 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
717 if (p == NULL)
718 return false;
719 p->next = eh->pcrel_relocs_copied;
720 eh->pcrel_relocs_copied = p;
721 p->section = sreloc;
722 p->count = 0;
723 }
724
725 ++p->count;
726 }
727 }
728
729 break;
730
731 /* This relocation describes the C++ object vtable hierarchy.
732 Reconstruct it for later use during GC. */
733 case R_68K_GNU_VTINHERIT:
734 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
735 return false;
736 break;
737
738 /* This relocation describes which C++ vtable entries are actually
739 used. Record for later use during GC. */
740 case R_68K_GNU_VTENTRY:
741 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
742 return false;
743 break;
744
745 default:
746 break;
747 }
748 }
749
750 return true;
751 }
752
753 /* Return the section that should be marked against GC for a given
754 relocation. */
755
756 static asection *
757 elf_m68k_gc_mark_hook (abfd, info, rel, h, sym)
758 bfd *abfd;
759 struct bfd_link_info *info ATTRIBUTE_UNUSED;
760 Elf_Internal_Rela *rel;
761 struct elf_link_hash_entry *h;
762 Elf_Internal_Sym *sym;
763 {
764 if (h != NULL)
765 {
766 switch (ELF32_R_TYPE (rel->r_info))
767 {
768 case R_68K_GNU_VTINHERIT:
769 case R_68K_GNU_VTENTRY:
770 break;
771
772 default:
773 switch (h->root.type)
774 {
775 default:
776 break;
777
778 case bfd_link_hash_defined:
779 case bfd_link_hash_defweak:
780 return h->root.u.def.section;
781
782 case bfd_link_hash_common:
783 return h->root.u.c.p->section;
784 }
785 }
786 }
787 else
788 {
789 return bfd_section_from_elf_index (abfd, sym->st_shndx);
790 }
791
792 return NULL;
793 }
794
795 /* Update the got entry reference counts for the section being removed. */
796
797 static boolean
798 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
799 bfd *abfd;
800 struct bfd_link_info *info;
801 asection *sec;
802 const Elf_Internal_Rela *relocs;
803 {
804 Elf_Internal_Shdr *symtab_hdr;
805 struct elf_link_hash_entry **sym_hashes;
806 bfd_signed_vma *local_got_refcounts;
807 const Elf_Internal_Rela *rel, *relend;
808 unsigned long r_symndx;
809 struct elf_link_hash_entry *h;
810 bfd *dynobj;
811 asection *sgot;
812 asection *srelgot;
813
814 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
815 sym_hashes = elf_sym_hashes (abfd);
816 local_got_refcounts = elf_local_got_refcounts (abfd);
817
818 dynobj = elf_hash_table (info)->dynobj;
819 if (dynobj == NULL)
820 return true;
821
822 sgot = bfd_get_section_by_name (dynobj, ".got");
823 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
824
825 relend = relocs + sec->reloc_count;
826 for (rel = relocs; rel < relend; rel++)
827 {
828 switch (ELF32_R_TYPE (rel->r_info))
829 {
830 case R_68K_GOT8:
831 case R_68K_GOT16:
832 case R_68K_GOT32:
833 case R_68K_GOT8O:
834 case R_68K_GOT16O:
835 case R_68K_GOT32O:
836 r_symndx = ELF32_R_SYM (rel->r_info);
837 if (r_symndx >= symtab_hdr->sh_info)
838 {
839 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
840 if (h->got.refcount > 0)
841 {
842 --h->got.refcount;
843 if (h->got.refcount == 0)
844 {
845 /* We don't need the .got entry any more. */
846 sgot->_raw_size -= 4;
847 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
848 }
849 }
850 }
851 else if (local_got_refcounts != NULL)
852 {
853 if (local_got_refcounts[r_symndx] > 0)
854 {
855 --local_got_refcounts[r_symndx];
856 if (local_got_refcounts[r_symndx] == 0)
857 {
858 /* We don't need the .got entry any more. */
859 sgot->_raw_size -= 4;
860 if (info->shared)
861 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
862 }
863 }
864 }
865 break;
866
867 case R_68K_PLT8:
868 case R_68K_PLT16:
869 case R_68K_PLT32:
870 case R_68K_PLT8O:
871 case R_68K_PLT16O:
872 case R_68K_PLT32O:
873 case R_68K_PC8:
874 case R_68K_PC16:
875 case R_68K_PC32:
876 case R_68K_8:
877 case R_68K_16:
878 case R_68K_32:
879 r_symndx = ELF32_R_SYM (rel->r_info);
880 if (r_symndx >= symtab_hdr->sh_info)
881 {
882 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
883 if (h->plt.refcount > 0)
884 --h->plt.refcount;
885 }
886 break;
887
888 default:
889 break;
890 }
891 }
892
893 return true;
894 }
895
896 /* Adjust a symbol defined by a dynamic object and referenced by a
897 regular object. The current definition is in some section of the
898 dynamic object, but we're not including those sections. We have to
899 change the definition to something the rest of the link can
900 understand. */
901
902 static boolean
903 elf_m68k_adjust_dynamic_symbol (info, h)
904 struct bfd_link_info *info;
905 struct elf_link_hash_entry *h;
906 {
907 bfd *dynobj;
908 asection *s;
909 unsigned int power_of_two;
910
911 dynobj = elf_hash_table (info)->dynobj;
912
913 /* Make sure we know what is going on here. */
914 BFD_ASSERT (dynobj != NULL
915 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
916 || h->weakdef != NULL
917 || ((h->elf_link_hash_flags
918 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
919 && (h->elf_link_hash_flags
920 & ELF_LINK_HASH_REF_REGULAR) != 0
921 && (h->elf_link_hash_flags
922 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
923
924 /* If this is a function, put it in the procedure linkage table. We
925 will fill in the contents of the procedure linkage table later,
926 when we know the address of the .got section. */
927 if (h->type == STT_FUNC
928 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
929 {
930 if (! info->shared
931 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
932 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
933 /* We must always create the plt entry if it was referenced
934 by a PLTxxO relocation. In this case we already recorded
935 it as a dynamic symbol. */
936 && h->dynindx == -1)
937 {
938 /* This case can occur if we saw a PLTxx reloc in an input
939 file, but the symbol was never referred to by a dynamic
940 object. In such a case, we don't actually need to build
941 a procedure linkage table, and we can just do a PCxx
942 reloc instead. */
943 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
944 h->plt.offset = (bfd_vma) -1;
945 return true;
946 }
947
948 /* GC may have rendered this entry unused. */
949 if (h->plt.refcount <= 0)
950 {
951 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
952 h->plt.offset = (bfd_vma) -1;
953 return true;
954 }
955
956 /* Make sure this symbol is output as a dynamic symbol. */
957 if (h->dynindx == -1)
958 {
959 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
960 return false;
961 }
962
963 s = bfd_get_section_by_name (dynobj, ".plt");
964 BFD_ASSERT (s != NULL);
965
966 /* If this is the first .plt entry, make room for the special
967 first entry. */
968 if (s->_raw_size == 0)
969 {
970 if (CPU32_FLAG (dynobj))
971 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
972 else
973 s->_raw_size += PLT_ENTRY_SIZE;
974 }
975
976 /* If this symbol is not defined in a regular file, and we are
977 not generating a shared library, then set the symbol to this
978 location in the .plt. This is required to make function
979 pointers compare as equal between the normal executable and
980 the shared library. */
981 if (!info->shared
982 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
983 {
984 h->root.u.def.section = s;
985 h->root.u.def.value = s->_raw_size;
986 }
987
988 h->plt.offset = s->_raw_size;
989
990 /* Make room for this entry. */
991 if (CPU32_FLAG (dynobj))
992 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
993 else
994 s->_raw_size += PLT_ENTRY_SIZE;
995
996 /* We also need to make an entry in the .got.plt section, which
997 will be placed in the .got section by the linker script. */
998
999 s = bfd_get_section_by_name (dynobj, ".got.plt");
1000 BFD_ASSERT (s != NULL);
1001 s->_raw_size += 4;
1002
1003 /* We also need to make an entry in the .rela.plt section. */
1004
1005 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1006 BFD_ASSERT (s != NULL);
1007 s->_raw_size += sizeof (Elf32_External_Rela);
1008
1009 return true;
1010 }
1011
1012 /* Reinitialize the plt offset now that it is not used as a reference
1013 count any more. */
1014 h->plt.offset = (bfd_vma) -1;
1015
1016 /* If this is a weak symbol, and there is a real definition, the
1017 processor independent code will have arranged for us to see the
1018 real definition first, and we can just use the same value. */
1019 if (h->weakdef != NULL)
1020 {
1021 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1022 || h->weakdef->root.type == bfd_link_hash_defweak);
1023 h->root.u.def.section = h->weakdef->root.u.def.section;
1024 h->root.u.def.value = h->weakdef->root.u.def.value;
1025 return true;
1026 }
1027
1028 /* This is a reference to a symbol defined by a dynamic object which
1029 is not a function. */
1030
1031 /* If we are creating a shared library, we must presume that the
1032 only references to the symbol are via the global offset table.
1033 For such cases we need not do anything here; the relocations will
1034 be handled correctly by relocate_section. */
1035 if (info->shared)
1036 return true;
1037
1038 /* We must allocate the symbol in our .dynbss section, which will
1039 become part of the .bss section of the executable. There will be
1040 an entry for this symbol in the .dynsym section. The dynamic
1041 object will contain position independent code, so all references
1042 from the dynamic object to this symbol will go through the global
1043 offset table. The dynamic linker will use the .dynsym entry to
1044 determine the address it must put in the global offset table, so
1045 both the dynamic object and the regular object will refer to the
1046 same memory location for the variable. */
1047
1048 s = bfd_get_section_by_name (dynobj, ".dynbss");
1049 BFD_ASSERT (s != NULL);
1050
1051 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1052 copy the initial value out of the dynamic object and into the
1053 runtime process image. We need to remember the offset into the
1054 .rela.bss section we are going to use. */
1055 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1056 {
1057 asection *srel;
1058
1059 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1060 BFD_ASSERT (srel != NULL);
1061 srel->_raw_size += sizeof (Elf32_External_Rela);
1062 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1063 }
1064
1065 /* We need to figure out the alignment required for this symbol. I
1066 have no idea how ELF linkers handle this. */
1067 power_of_two = bfd_log2 (h->size);
1068 if (power_of_two > 3)
1069 power_of_two = 3;
1070
1071 /* Apply the required alignment. */
1072 s->_raw_size = BFD_ALIGN (s->_raw_size,
1073 (bfd_size_type) (1 << power_of_two));
1074 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1075 {
1076 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1077 return false;
1078 }
1079
1080 /* Define the symbol as being at this point in the section. */
1081 h->root.u.def.section = s;
1082 h->root.u.def.value = s->_raw_size;
1083
1084 /* Increment the section size to make room for the symbol. */
1085 s->_raw_size += h->size;
1086
1087 return true;
1088 }
1089
1090 /* Set the sizes of the dynamic sections. */
1091
1092 static boolean
1093 elf_m68k_size_dynamic_sections (output_bfd, info)
1094 bfd *output_bfd ATTRIBUTE_UNUSED;
1095 struct bfd_link_info *info;
1096 {
1097 bfd *dynobj;
1098 asection *s;
1099 boolean plt;
1100 boolean relocs;
1101
1102 dynobj = elf_hash_table (info)->dynobj;
1103 BFD_ASSERT (dynobj != NULL);
1104
1105 if (elf_hash_table (info)->dynamic_sections_created)
1106 {
1107 /* Set the contents of the .interp section to the interpreter. */
1108 if (!info->shared)
1109 {
1110 s = bfd_get_section_by_name (dynobj, ".interp");
1111 BFD_ASSERT (s != NULL);
1112 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1113 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1114 }
1115 }
1116 else
1117 {
1118 /* We may have created entries in the .rela.got section.
1119 However, if we are not creating the dynamic sections, we will
1120 not actually use these entries. Reset the size of .rela.got,
1121 which will cause it to get stripped from the output file
1122 below. */
1123 s = bfd_get_section_by_name (dynobj, ".rela.got");
1124 if (s != NULL)
1125 s->_raw_size = 0;
1126 }
1127
1128 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1129 relative relocs against symbols defined in a regular object. We
1130 allocated space for them in the check_relocs routine, but we will not
1131 fill them in in the relocate_section routine. */
1132 if (info->shared && info->symbolic)
1133 elf_m68k_link_hash_traverse (elf_m68k_hash_table (info),
1134 elf_m68k_discard_copies,
1135 (PTR) NULL);
1136
1137 /* The check_relocs and adjust_dynamic_symbol entry points have
1138 determined the sizes of the various dynamic sections. Allocate
1139 memory for them. */
1140 plt = false;
1141 relocs = false;
1142 for (s = dynobj->sections; s != NULL; s = s->next)
1143 {
1144 const char *name;
1145 boolean strip;
1146
1147 if ((s->flags & SEC_LINKER_CREATED) == 0)
1148 continue;
1149
1150 /* It's OK to base decisions on the section name, because none
1151 of the dynobj section names depend upon the input files. */
1152 name = bfd_get_section_name (dynobj, s);
1153
1154 strip = false;
1155
1156 if (strcmp (name, ".plt") == 0)
1157 {
1158 if (s->_raw_size == 0)
1159 {
1160 /* Strip this section if we don't need it; see the
1161 comment below. */
1162 strip = true;
1163 }
1164 else
1165 {
1166 /* Remember whether there is a PLT. */
1167 plt = true;
1168 }
1169 }
1170 else if (strncmp (name, ".rela", 5) == 0)
1171 {
1172 if (s->_raw_size == 0)
1173 {
1174 /* If we don't need this section, strip it from the
1175 output file. This is mostly to handle .rela.bss and
1176 .rela.plt. We must create both sections in
1177 create_dynamic_sections, because they must be created
1178 before the linker maps input sections to output
1179 sections. The linker does that before
1180 adjust_dynamic_symbol is called, and it is that
1181 function which decides whether anything needs to go
1182 into these sections. */
1183 strip = true;
1184 }
1185 else
1186 {
1187 relocs = true;
1188
1189 /* We use the reloc_count field as a counter if we need
1190 to copy relocs into the output file. */
1191 s->reloc_count = 0;
1192 }
1193 }
1194 else if (strncmp (name, ".got", 4) != 0)
1195 {
1196 /* It's not one of our sections, so don't allocate space. */
1197 continue;
1198 }
1199
1200 if (strip)
1201 {
1202 _bfd_strip_section_from_output (info, s);
1203 continue;
1204 }
1205
1206 /* Allocate memory for the section contents. */
1207 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1208 Unused entries should be reclaimed before the section's contents
1209 are written out, but at the moment this does not happen. Thus in
1210 order to prevent writing out garbage, we initialise the section's
1211 contents to zero. */
1212 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1213 if (s->contents == NULL && s->_raw_size != 0)
1214 return false;
1215 }
1216
1217 if (elf_hash_table (info)->dynamic_sections_created)
1218 {
1219 /* Add some entries to the .dynamic section. We fill in the
1220 values later, in elf_m68k_finish_dynamic_sections, but we
1221 must add the entries now so that we get the correct size for
1222 the .dynamic section. The DT_DEBUG entry is filled in by the
1223 dynamic linker and used by the debugger. */
1224 #define add_dynamic_entry(TAG, VAL) \
1225 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1226
1227 if (!info->shared)
1228 {
1229 if (!add_dynamic_entry (DT_DEBUG, 0))
1230 return false;
1231 }
1232
1233 if (plt)
1234 {
1235 if (!add_dynamic_entry (DT_PLTGOT, 0)
1236 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1237 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1238 || !add_dynamic_entry (DT_JMPREL, 0))
1239 return false;
1240 }
1241
1242 if (relocs)
1243 {
1244 if (!add_dynamic_entry (DT_RELA, 0)
1245 || !add_dynamic_entry (DT_RELASZ, 0)
1246 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1247 return false;
1248 }
1249
1250 if ((info->flags & DF_TEXTREL) != 0)
1251 {
1252 if (!add_dynamic_entry (DT_TEXTREL, 0))
1253 return false;
1254 }
1255 }
1256 #undef add_dynamic_entry
1257
1258 return true;
1259 }
1260
1261 /* This function is called via elf_m68k_link_hash_traverse if we are
1262 creating a shared object with -Bsymbolic. It discards the space
1263 allocated to copy PC relative relocs against symbols which are defined
1264 in regular objects. We allocated space for them in the check_relocs
1265 routine, but we won't fill them in in the relocate_section routine. */
1266
1267 static boolean
1268 elf_m68k_discard_copies (h, ignore)
1269 struct elf_m68k_link_hash_entry *h;
1270 PTR ignore ATTRIBUTE_UNUSED;
1271 {
1272 struct elf_m68k_pcrel_relocs_copied *s;
1273
1274 if (h->root.root.type == bfd_link_hash_warning)
1275 h = (struct elf_m68k_link_hash_entry *) h->root.root.u.i.link;
1276
1277 /* We only discard relocs for symbols defined in a regular object. */
1278 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1279 return true;
1280
1281 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1282 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1283
1284 return true;
1285 }
1286
1287 /* Relocate an M68K ELF section. */
1288
1289 static boolean
1290 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1291 contents, relocs, local_syms, local_sections)
1292 bfd *output_bfd;
1293 struct bfd_link_info *info;
1294 bfd *input_bfd;
1295 asection *input_section;
1296 bfd_byte *contents;
1297 Elf_Internal_Rela *relocs;
1298 Elf_Internal_Sym *local_syms;
1299 asection **local_sections;
1300 {
1301 bfd *dynobj;
1302 Elf_Internal_Shdr *symtab_hdr;
1303 struct elf_link_hash_entry **sym_hashes;
1304 bfd_vma *local_got_offsets;
1305 asection *sgot;
1306 asection *splt;
1307 asection *sreloc;
1308 Elf_Internal_Rela *rel;
1309 Elf_Internal_Rela *relend;
1310
1311 dynobj = elf_hash_table (info)->dynobj;
1312 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1313 sym_hashes = elf_sym_hashes (input_bfd);
1314 local_got_offsets = elf_local_got_offsets (input_bfd);
1315
1316 sgot = NULL;
1317 splt = NULL;
1318 sreloc = NULL;
1319
1320 rel = relocs;
1321 relend = relocs + input_section->reloc_count;
1322 for (; rel < relend; rel++)
1323 {
1324 int r_type;
1325 reloc_howto_type *howto;
1326 unsigned long r_symndx;
1327 struct elf_link_hash_entry *h;
1328 Elf_Internal_Sym *sym;
1329 asection *sec;
1330 bfd_vma relocation;
1331 bfd_reloc_status_type r;
1332
1333 r_type = ELF32_R_TYPE (rel->r_info);
1334 if (r_type < 0 || r_type >= (int) R_68K_max)
1335 {
1336 bfd_set_error (bfd_error_bad_value);
1337 return false;
1338 }
1339 howto = howto_table + r_type;
1340
1341 r_symndx = ELF32_R_SYM (rel->r_info);
1342
1343 if (info->relocateable)
1344 {
1345 /* This is a relocateable link. We don't have to change
1346 anything, unless the reloc is against a section symbol,
1347 in which case we have to adjust according to where the
1348 section symbol winds up in the output section. */
1349 if (r_symndx < symtab_hdr->sh_info)
1350 {
1351 sym = local_syms + r_symndx;
1352 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1353 {
1354 sec = local_sections[r_symndx];
1355 rel->r_addend += sec->output_offset + sym->st_value;
1356 }
1357 }
1358
1359 continue;
1360 }
1361
1362 /* This is a final link. */
1363 h = NULL;
1364 sym = NULL;
1365 sec = NULL;
1366 if (r_symndx < symtab_hdr->sh_info)
1367 {
1368 sym = local_syms + r_symndx;
1369 sec = local_sections[r_symndx];
1370 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
1371 }
1372 else
1373 {
1374 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1375 while (h->root.type == bfd_link_hash_indirect
1376 || h->root.type == bfd_link_hash_warning)
1377 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1378 if (h->root.type == bfd_link_hash_defined
1379 || h->root.type == bfd_link_hash_defweak)
1380 {
1381 sec = h->root.u.def.section;
1382 if (((r_type == R_68K_PLT8
1383 || r_type == R_68K_PLT16
1384 || r_type == R_68K_PLT32
1385 || r_type == R_68K_PLT8O
1386 || r_type == R_68K_PLT16O
1387 || r_type == R_68K_PLT32O)
1388 && h->plt.offset != (bfd_vma) -1
1389 && elf_hash_table (info)->dynamic_sections_created)
1390 || ((r_type == R_68K_GOT8O
1391 || r_type == R_68K_GOT16O
1392 || r_type == R_68K_GOT32O
1393 || ((r_type == R_68K_GOT8
1394 || r_type == R_68K_GOT16
1395 || r_type == R_68K_GOT32)
1396 && strcmp (h->root.root.string,
1397 "_GLOBAL_OFFSET_TABLE_") != 0))
1398 && elf_hash_table (info)->dynamic_sections_created
1399 && (! info->shared
1400 || (! info->symbolic && h->dynindx != -1)
1401 || (h->elf_link_hash_flags
1402 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1403 || (info->shared
1404 && ((! info->symbolic && h->dynindx != -1)
1405 || (h->elf_link_hash_flags
1406 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1407 && ((input_section->flags & SEC_ALLOC) != 0
1408 /* DWARF will emit R_68K_32 relocations in its
1409 sections against symbols defined externally
1410 in shared libraries. We can't do anything
1411 with them here. */
1412 || ((input_section->flags & SEC_DEBUGGING) != 0
1413 && (h->elf_link_hash_flags
1414 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1415 && (r_type == R_68K_8
1416 || r_type == R_68K_16
1417 || r_type == R_68K_32
1418 || r_type == R_68K_PC8
1419 || r_type == R_68K_PC16
1420 || r_type == R_68K_PC32)))
1421 {
1422 /* In these cases, we don't need the relocation
1423 value. We check specially because in some
1424 obscure cases sec->output_section will be NULL. */
1425 relocation = 0;
1426 }
1427 else
1428 relocation = (h->root.u.def.value
1429 + sec->output_section->vma
1430 + sec->output_offset);
1431 }
1432 else if (h->root.type == bfd_link_hash_undefweak)
1433 relocation = 0;
1434 else if (info->shared
1435 && (!info->symbolic || info->allow_shlib_undefined)
1436 && !info->no_undefined
1437 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1438 relocation = 0;
1439 else
1440 {
1441 if (!(info->callbacks->undefined_symbol
1442 (info, h->root.root.string, input_bfd,
1443 input_section, rel->r_offset,
1444 (!info->shared || info->no_undefined
1445 || ELF_ST_VISIBILITY (h->other)))))
1446 return false;
1447 relocation = 0;
1448 }
1449 }
1450
1451 switch (r_type)
1452 {
1453 case R_68K_GOT8:
1454 case R_68K_GOT16:
1455 case R_68K_GOT32:
1456 /* Relocation is to the address of the entry for this symbol
1457 in the global offset table. */
1458 if (h != NULL
1459 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1460 break;
1461 /* Fall through. */
1462 case R_68K_GOT8O:
1463 case R_68K_GOT16O:
1464 case R_68K_GOT32O:
1465 /* Relocation is the offset of the entry for this symbol in
1466 the global offset table. */
1467
1468 {
1469 bfd_vma off;
1470
1471 if (sgot == NULL)
1472 {
1473 sgot = bfd_get_section_by_name (dynobj, ".got");
1474 BFD_ASSERT (sgot != NULL);
1475 }
1476
1477 if (h != NULL)
1478 {
1479 off = h->got.offset;
1480 BFD_ASSERT (off != (bfd_vma) -1);
1481
1482 if (!elf_hash_table (info)->dynamic_sections_created
1483 || (info->shared
1484 && (info->symbolic || h->dynindx == -1)
1485 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1486 {
1487 /* This is actually a static link, or it is a
1488 -Bsymbolic link and the symbol is defined
1489 locally, or the symbol was forced to be local
1490 because of a version file.. We must initialize
1491 this entry in the global offset table. Since
1492 the offset must always be a multiple of 4, we
1493 use the least significant bit to record whether
1494 we have initialized it already.
1495
1496 When doing a dynamic link, we create a .rela.got
1497 relocation entry to initialize the value. This
1498 is done in the finish_dynamic_symbol routine. */
1499 if ((off & 1) != 0)
1500 off &= ~1;
1501 else
1502 {
1503 bfd_put_32 (output_bfd, relocation,
1504 sgot->contents + off);
1505 h->got.offset |= 1;
1506 }
1507 }
1508 }
1509 else
1510 {
1511 BFD_ASSERT (local_got_offsets != NULL
1512 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1513
1514 off = local_got_offsets[r_symndx];
1515
1516 /* The offset must always be a multiple of 4. We use
1517 the least significant bit to record whether we have
1518 already generated the necessary reloc. */
1519 if ((off & 1) != 0)
1520 off &= ~1;
1521 else
1522 {
1523 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1524
1525 if (info->shared)
1526 {
1527 asection *srelgot;
1528 Elf_Internal_Rela outrel;
1529
1530 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1531 BFD_ASSERT (srelgot != NULL);
1532
1533 outrel.r_offset = (sgot->output_section->vma
1534 + sgot->output_offset
1535 + off);
1536 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1537 outrel.r_addend = relocation;
1538 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1539 (((Elf32_External_Rela *)
1540 srelgot->contents)
1541 + srelgot->reloc_count));
1542 ++srelgot->reloc_count;
1543 }
1544
1545 local_got_offsets[r_symndx] |= 1;
1546 }
1547 }
1548
1549 relocation = sgot->output_offset + off;
1550 if (r_type == R_68K_GOT8O
1551 || r_type == R_68K_GOT16O
1552 || r_type == R_68K_GOT32O)
1553 {
1554 /* This relocation does not use the addend. */
1555 rel->r_addend = 0;
1556 }
1557 else
1558 relocation += sgot->output_section->vma;
1559 }
1560 break;
1561
1562 case R_68K_PLT8:
1563 case R_68K_PLT16:
1564 case R_68K_PLT32:
1565 /* Relocation is to the entry for this symbol in the
1566 procedure linkage table. */
1567
1568 /* Resolve a PLTxx reloc against a local symbol directly,
1569 without using the procedure linkage table. */
1570 if (h == NULL)
1571 break;
1572
1573 if (h->plt.offset == (bfd_vma) -1
1574 || !elf_hash_table (info)->dynamic_sections_created)
1575 {
1576 /* We didn't make a PLT entry for this symbol. This
1577 happens when statically linking PIC code, or when
1578 using -Bsymbolic. */
1579 break;
1580 }
1581
1582 if (splt == NULL)
1583 {
1584 splt = bfd_get_section_by_name (dynobj, ".plt");
1585 BFD_ASSERT (splt != NULL);
1586 }
1587
1588 relocation = (splt->output_section->vma
1589 + splt->output_offset
1590 + h->plt.offset);
1591 break;
1592
1593 case R_68K_PLT8O:
1594 case R_68K_PLT16O:
1595 case R_68K_PLT32O:
1596 /* Relocation is the offset of the entry for this symbol in
1597 the procedure linkage table. */
1598 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1599
1600 if (splt == NULL)
1601 {
1602 splt = bfd_get_section_by_name (dynobj, ".plt");
1603 BFD_ASSERT (splt != NULL);
1604 }
1605
1606 relocation = h->plt.offset;
1607
1608 /* This relocation does not use the addend. */
1609 rel->r_addend = 0;
1610
1611 break;
1612
1613 case R_68K_PC8:
1614 case R_68K_PC16:
1615 case R_68K_PC32:
1616 if (h == NULL)
1617 break;
1618 /* Fall through. */
1619 case R_68K_8:
1620 case R_68K_16:
1621 case R_68K_32:
1622 if (info->shared
1623 && r_symndx != 0
1624 && (input_section->flags & SEC_ALLOC) != 0
1625 && ((r_type != R_68K_PC8
1626 && r_type != R_68K_PC16
1627 && r_type != R_68K_PC32)
1628 || (!info->symbolic
1629 || (h->elf_link_hash_flags
1630 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1631 {
1632 Elf_Internal_Rela outrel;
1633 boolean skip, relocate;
1634
1635 /* When generating a shared object, these relocations
1636 are copied into the output file to be resolved at run
1637 time. */
1638
1639 if (sreloc == NULL)
1640 {
1641 const char *name;
1642
1643 name = (bfd_elf_string_from_elf_section
1644 (input_bfd,
1645 elf_elfheader (input_bfd)->e_shstrndx,
1646 elf_section_data (input_section)->rel_hdr.sh_name));
1647 if (name == NULL)
1648 return false;
1649
1650 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1651 && strcmp (bfd_get_section_name (input_bfd,
1652 input_section),
1653 name + 5) == 0);
1654
1655 sreloc = bfd_get_section_by_name (dynobj, name);
1656 BFD_ASSERT (sreloc != NULL);
1657 }
1658
1659 skip = false;
1660 relocate = false;
1661
1662 outrel.r_offset =
1663 _bfd_elf_section_offset (output_bfd, info, input_section,
1664 rel->r_offset);
1665 if (outrel.r_offset == (bfd_vma) -1)
1666 skip = true;
1667 else if (outrel.r_offset == (bfd_vma) -2)
1668 skip = true, relocate = true;
1669 outrel.r_offset += (input_section->output_section->vma
1670 + input_section->output_offset);
1671
1672 if (skip)
1673 memset (&outrel, 0, sizeof outrel);
1674 /* h->dynindx may be -1 if the symbol was marked to
1675 become local. */
1676 else if (h != NULL
1677 && ((! info->symbolic && h->dynindx != -1)
1678 || (h->elf_link_hash_flags
1679 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1680 {
1681 BFD_ASSERT (h->dynindx != -1);
1682 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1683 outrel.r_addend = relocation + rel->r_addend;
1684 }
1685 else
1686 {
1687 if (r_type == R_68K_32)
1688 {
1689 relocate = true;
1690 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1691 outrel.r_addend = relocation + rel->r_addend;
1692 }
1693 else
1694 {
1695 long indx;
1696
1697 if (h == NULL)
1698 sec = local_sections[r_symndx];
1699 else
1700 {
1701 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1702 || (h->root.type
1703 == bfd_link_hash_defweak));
1704 sec = h->root.u.def.section;
1705 }
1706 if (sec != NULL && bfd_is_abs_section (sec))
1707 indx = 0;
1708 else if (sec == NULL || sec->owner == NULL)
1709 {
1710 bfd_set_error (bfd_error_bad_value);
1711 return false;
1712 }
1713 else
1714 {
1715 asection *osec;
1716
1717 osec = sec->output_section;
1718 indx = elf_section_data (osec)->dynindx;
1719 BFD_ASSERT (indx > 0);
1720 }
1721
1722 outrel.r_info = ELF32_R_INFO (indx, r_type);
1723 outrel.r_addend = relocation + rel->r_addend;
1724 }
1725 }
1726
1727 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1728 (((Elf32_External_Rela *)
1729 sreloc->contents)
1730 + sreloc->reloc_count));
1731 ++sreloc->reloc_count;
1732
1733 /* This reloc will be computed at runtime, so there's no
1734 need to do anything now, except for R_68K_32
1735 relocations that have been turned into
1736 R_68K_RELATIVE. */
1737 if (!relocate)
1738 continue;
1739 }
1740
1741 break;
1742
1743 case R_68K_GNU_VTINHERIT:
1744 case R_68K_GNU_VTENTRY:
1745 /* These are no-ops in the end. */
1746 continue;
1747
1748 default:
1749 break;
1750 }
1751
1752 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1753 contents, rel->r_offset,
1754 relocation, rel->r_addend);
1755
1756 if (r != bfd_reloc_ok)
1757 {
1758 switch (r)
1759 {
1760 default:
1761 case bfd_reloc_outofrange:
1762 abort ();
1763 case bfd_reloc_overflow:
1764 {
1765 const char *name;
1766
1767 if (h != NULL)
1768 name = h->root.root.string;
1769 else
1770 {
1771 name = bfd_elf_string_from_elf_section (input_bfd,
1772 symtab_hdr->sh_link,
1773 sym->st_name);
1774 if (name == NULL)
1775 return false;
1776 if (*name == '\0')
1777 name = bfd_section_name (input_bfd, sec);
1778 }
1779 if (!(info->callbacks->reloc_overflow
1780 (info, name, howto->name, (bfd_vma) 0,
1781 input_bfd, input_section, rel->r_offset)))
1782 return false;
1783 }
1784 break;
1785 }
1786 }
1787 }
1788
1789 return true;
1790 }
1791
1792 /* Finish up dynamic symbol handling. We set the contents of various
1793 dynamic sections here. */
1794
1795 static boolean
1796 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1797 bfd *output_bfd;
1798 struct bfd_link_info *info;
1799 struct elf_link_hash_entry *h;
1800 Elf_Internal_Sym *sym;
1801 {
1802 bfd *dynobj;
1803 int plt_off1, plt_off2, plt_off3;
1804
1805 dynobj = elf_hash_table (info)->dynobj;
1806
1807 if (h->plt.offset != (bfd_vma) -1)
1808 {
1809 asection *splt;
1810 asection *sgot;
1811 asection *srela;
1812 bfd_vma plt_index;
1813 bfd_vma got_offset;
1814 Elf_Internal_Rela rela;
1815
1816 /* This symbol has an entry in the procedure linkage table. Set
1817 it up. */
1818
1819 BFD_ASSERT (h->dynindx != -1);
1820
1821 splt = bfd_get_section_by_name (dynobj, ".plt");
1822 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1823 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1824 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1825
1826 /* Get the index in the procedure linkage table which
1827 corresponds to this symbol. This is the index of this symbol
1828 in all the symbols for which we are making plt entries. The
1829 first entry in the procedure linkage table is reserved. */
1830 if ( CPU32_FLAG (output_bfd))
1831 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1832 else
1833 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1834
1835 /* Get the offset into the .got table of the entry that
1836 corresponds to this function. Each .got entry is 4 bytes.
1837 The first three are reserved. */
1838 got_offset = (plt_index + 3) * 4;
1839
1840 if ( CPU32_FLAG (output_bfd))
1841 {
1842 /* Fill in the entry in the procedure linkage table. */
1843 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1844 PLT_CPU32_ENTRY_SIZE);
1845 plt_off1 = 4;
1846 plt_off2 = 12;
1847 plt_off3 = 18;
1848 }
1849 else
1850 {
1851 /* Fill in the entry in the procedure linkage table. */
1852 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1853 PLT_ENTRY_SIZE);
1854 plt_off1 = 4;
1855 plt_off2 = 10;
1856 plt_off3 = 16;
1857 }
1858
1859 /* The offset is relative to the first extension word. */
1860 bfd_put_32 (output_bfd,
1861 (sgot->output_section->vma
1862 + sgot->output_offset
1863 + got_offset
1864 - (splt->output_section->vma
1865 + h->plt.offset + 2)),
1866 splt->contents + h->plt.offset + plt_off1);
1867
1868 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1869 splt->contents + h->plt.offset + plt_off2);
1870 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1871 splt->contents + h->plt.offset + plt_off3);
1872
1873 /* Fill in the entry in the global offset table. */
1874 bfd_put_32 (output_bfd,
1875 (splt->output_section->vma
1876 + splt->output_offset
1877 + h->plt.offset
1878 + 8),
1879 sgot->contents + got_offset);
1880
1881 /* Fill in the entry in the .rela.plt section. */
1882 rela.r_offset = (sgot->output_section->vma
1883 + sgot->output_offset
1884 + got_offset);
1885 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1886 rela.r_addend = 0;
1887 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1888 ((Elf32_External_Rela *) srela->contents
1889 + plt_index));
1890
1891 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1892 {
1893 /* Mark the symbol as undefined, rather than as defined in
1894 the .plt section. Leave the value alone. */
1895 sym->st_shndx = SHN_UNDEF;
1896 }
1897 }
1898
1899 if (h->got.offset != (bfd_vma) -1)
1900 {
1901 asection *sgot;
1902 asection *srela;
1903 Elf_Internal_Rela rela;
1904
1905 /* This symbol has an entry in the global offset table. Set it
1906 up. */
1907
1908 sgot = bfd_get_section_by_name (dynobj, ".got");
1909 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1910 BFD_ASSERT (sgot != NULL && srela != NULL);
1911
1912 rela.r_offset = (sgot->output_section->vma
1913 + sgot->output_offset
1914 + (h->got.offset &~ (bfd_vma) 1));
1915
1916 /* If this is a -Bsymbolic link, and the symbol is defined
1917 locally, we just want to emit a RELATIVE reloc. Likewise if
1918 the symbol was forced to be local because of a version file.
1919 The entry in the global offset table will already have been
1920 initialized in the relocate_section function. */
1921 if (info->shared
1922 && (info->symbolic || h->dynindx == -1)
1923 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1924 {
1925 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1926 rela.r_addend = bfd_get_signed_32 (output_bfd,
1927 (sgot->contents
1928 + (h->got.offset &~ (bfd_vma) 1)));
1929 }
1930 else
1931 {
1932 bfd_put_32 (output_bfd, (bfd_vma) 0,
1933 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1934 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1935 rela.r_addend = 0;
1936 }
1937
1938 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1939 ((Elf32_External_Rela *) srela->contents
1940 + srela->reloc_count));
1941 ++srela->reloc_count;
1942 }
1943
1944 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1945 {
1946 asection *s;
1947 Elf_Internal_Rela rela;
1948
1949 /* This symbol needs a copy reloc. Set it up. */
1950
1951 BFD_ASSERT (h->dynindx != -1
1952 && (h->root.type == bfd_link_hash_defined
1953 || h->root.type == bfd_link_hash_defweak));
1954
1955 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1956 ".rela.bss");
1957 BFD_ASSERT (s != NULL);
1958
1959 rela.r_offset = (h->root.u.def.value
1960 + h->root.u.def.section->output_section->vma
1961 + h->root.u.def.section->output_offset);
1962 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1963 rela.r_addend = 0;
1964 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1965 ((Elf32_External_Rela *) s->contents
1966 + s->reloc_count));
1967 ++s->reloc_count;
1968 }
1969
1970 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1971 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1972 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1973 sym->st_shndx = SHN_ABS;
1974
1975 return true;
1976 }
1977
1978 /* Finish up the dynamic sections. */
1979
1980 static boolean
1981 elf_m68k_finish_dynamic_sections (output_bfd, info)
1982 bfd *output_bfd;
1983 struct bfd_link_info *info;
1984 {
1985 bfd *dynobj;
1986 asection *sgot;
1987 asection *sdyn;
1988
1989 dynobj = elf_hash_table (info)->dynobj;
1990
1991 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1992 BFD_ASSERT (sgot != NULL);
1993 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1994
1995 if (elf_hash_table (info)->dynamic_sections_created)
1996 {
1997 asection *splt;
1998 Elf32_External_Dyn *dyncon, *dynconend;
1999
2000 splt = bfd_get_section_by_name (dynobj, ".plt");
2001 BFD_ASSERT (splt != NULL && sdyn != NULL);
2002
2003 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2004 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2005 for (; dyncon < dynconend; dyncon++)
2006 {
2007 Elf_Internal_Dyn dyn;
2008 const char *name;
2009 asection *s;
2010
2011 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2012
2013 switch (dyn.d_tag)
2014 {
2015 default:
2016 break;
2017
2018 case DT_PLTGOT:
2019 name = ".got";
2020 goto get_vma;
2021 case DT_JMPREL:
2022 name = ".rela.plt";
2023 get_vma:
2024 s = bfd_get_section_by_name (output_bfd, name);
2025 BFD_ASSERT (s != NULL);
2026 dyn.d_un.d_ptr = s->vma;
2027 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2028 break;
2029
2030 case DT_PLTRELSZ:
2031 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2032 BFD_ASSERT (s != NULL);
2033 if (s->_cooked_size != 0)
2034 dyn.d_un.d_val = s->_cooked_size;
2035 else
2036 dyn.d_un.d_val = s->_raw_size;
2037 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2038 break;
2039
2040 case DT_RELASZ:
2041 /* The procedure linkage table relocs (DT_JMPREL) should
2042 not be included in the overall relocs (DT_RELA).
2043 Therefore, we override the DT_RELASZ entry here to
2044 make it not include the JMPREL relocs. Since the
2045 linker script arranges for .rela.plt to follow all
2046 other relocation sections, we don't have to worry
2047 about changing the DT_RELA entry. */
2048 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2049 if (s != NULL)
2050 {
2051 if (s->_cooked_size != 0)
2052 dyn.d_un.d_val -= s->_cooked_size;
2053 else
2054 dyn.d_un.d_val -= s->_raw_size;
2055 }
2056 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2057 break;
2058 }
2059 }
2060
2061 /* Fill in the first entry in the procedure linkage table. */
2062 if (splt->_raw_size > 0)
2063 {
2064 if (!CPU32_FLAG (output_bfd))
2065 {
2066 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2067 bfd_put_32 (output_bfd,
2068 (sgot->output_section->vma
2069 + sgot->output_offset + 4
2070 - (splt->output_section->vma + 2)),
2071 splt->contents + 4);
2072 bfd_put_32 (output_bfd,
2073 (sgot->output_section->vma
2074 + sgot->output_offset + 8
2075 - (splt->output_section->vma + 10)),
2076 splt->contents + 12);
2077 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2078 = PLT_ENTRY_SIZE;
2079 }
2080 else /* cpu32 */
2081 {
2082 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2083 bfd_put_32 (output_bfd,
2084 (sgot->output_section->vma
2085 + sgot->output_offset + 4
2086 - (splt->output_section->vma + 2)),
2087 splt->contents + 4);
2088 bfd_put_32 (output_bfd,
2089 (sgot->output_section->vma
2090 + sgot->output_offset + 8
2091 - (splt->output_section->vma + 10)),
2092 splt->contents + 12);
2093 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2094 = PLT_CPU32_ENTRY_SIZE;
2095 }
2096 }
2097 }
2098
2099 /* Fill in the first three entries in the global offset table. */
2100 if (sgot->_raw_size > 0)
2101 {
2102 if (sdyn == NULL)
2103 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2104 else
2105 bfd_put_32 (output_bfd,
2106 sdyn->output_section->vma + sdyn->output_offset,
2107 sgot->contents);
2108 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2109 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2110 }
2111
2112 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2113
2114 return true;
2115 }
2116
2117 /* Given a .data section and a .emreloc in-memory section, store
2118 relocation information into the .emreloc section which can be
2119 used at runtime to relocate the section. This is called by the
2120 linker when the --embedded-relocs switch is used. This is called
2121 after the add_symbols entry point has been called for all the
2122 objects, and before the final_link entry point is called. */
2123
2124 boolean
2125 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2126 bfd *abfd;
2127 struct bfd_link_info *info;
2128 asection *datasec;
2129 asection *relsec;
2130 char **errmsg;
2131 {
2132 Elf_Internal_Shdr *symtab_hdr;
2133 Elf_Internal_Shdr *shndx_hdr;
2134 Elf32_External_Sym *extsyms;
2135 Elf32_External_Sym *free_extsyms = NULL;
2136 Elf_External_Sym_Shndx *shndx_buf = NULL;
2137 Elf_Internal_Rela *internal_relocs;
2138 Elf_Internal_Rela *free_relocs = NULL;
2139 Elf_Internal_Rela *irel, *irelend;
2140 bfd_byte *p;
2141 bfd_size_type amt;
2142
2143 BFD_ASSERT (! info->relocateable);
2144
2145 *errmsg = NULL;
2146
2147 if (datasec->reloc_count == 0)
2148 return true;
2149
2150 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2151 /* Read this BFD's symbols if we haven't done so already, or get the cached
2152 copy if it exists. */
2153 if (symtab_hdr->contents != NULL)
2154 extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
2155 else
2156 {
2157 /* Go get them off disk. */
2158 amt = symtab_hdr->sh_info * sizeof (Elf32_External_Sym);
2159 if (info->keep_memory)
2160 extsyms = (Elf32_External_Sym *) bfd_alloc (abfd, amt);
2161 else
2162 extsyms = (Elf32_External_Sym *) bfd_malloc (amt);
2163 if (extsyms == NULL)
2164 goto error_return;
2165 if (! info->keep_memory)
2166 free_extsyms = extsyms;
2167 if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
2168 || bfd_bread (extsyms, amt, abfd) != amt)
2169 goto error_return;
2170 if (info->keep_memory)
2171 symtab_hdr->contents = (unsigned char *) extsyms;
2172 }
2173
2174 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
2175 if (shndx_hdr->sh_size != 0)
2176 {
2177 amt = symtab_hdr->sh_info * sizeof (Elf_External_Sym_Shndx);
2178 shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
2179 if (shndx_buf == NULL)
2180 goto error_return;
2181 if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0
2182 || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
2183 goto error_return;
2184 }
2185
2186 /* Get a copy of the native relocations. */
2187 internal_relocs = (_bfd_elf32_link_read_relocs
2188 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2189 info->keep_memory));
2190 if (internal_relocs == NULL)
2191 goto error_return;
2192 if (! info->keep_memory)
2193 free_relocs = internal_relocs;
2194
2195 amt = (bfd_size_type) datasec->reloc_count * 12;
2196 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2197 if (relsec->contents == NULL)
2198 goto error_return;
2199
2200 p = relsec->contents;
2201
2202 irelend = internal_relocs + datasec->reloc_count;
2203 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2204 {
2205 asection *targetsec;
2206
2207 /* We are going to write a four byte longword into the runtime
2208 reloc section. The longword will be the address in the data
2209 section which must be relocated. It is followed by the name
2210 of the target section NUL-padded or truncated to 8
2211 characters. */
2212
2213 /* We can only relocate absolute longword relocs at run time. */
2214 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2215 {
2216 *errmsg = _("unsupported reloc type");
2217 bfd_set_error (bfd_error_bad_value);
2218 goto error_return;
2219 }
2220
2221 /* Get the target section referred to by the reloc. */
2222 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2223 {
2224 Elf32_External_Sym *esym;
2225 Elf_External_Sym_Shndx *shndx;
2226 Elf_Internal_Sym isym;
2227
2228 /* A local symbol. */
2229 esym = extsyms + ELF32_R_SYM (irel->r_info);
2230 shndx = shndx_buf + (shndx_buf ? ELF32_R_SYM (irel->r_info) : 0);
2231 bfd_elf32_swap_symbol_in (abfd, esym, shndx, &isym);
2232
2233 targetsec = bfd_section_from_elf_index (abfd, isym.st_shndx);
2234 }
2235 else
2236 {
2237 unsigned long indx;
2238 struct elf_link_hash_entry *h;
2239
2240 /* An external symbol. */
2241 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2242 h = elf_sym_hashes (abfd)[indx];
2243 BFD_ASSERT (h != NULL);
2244 if (h->root.type == bfd_link_hash_defined
2245 || h->root.type == bfd_link_hash_defweak)
2246 targetsec = h->root.u.def.section;
2247 else
2248 targetsec = NULL;
2249 }
2250
2251 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2252 memset (p + 4, 0, 8);
2253 if (targetsec != NULL)
2254 strncpy (p + 4, targetsec->output_section->name, 8);
2255 }
2256
2257 if (shndx_buf != NULL)
2258 free (shndx_buf);
2259 if (free_extsyms != NULL)
2260 free (free_extsyms);
2261 if (free_relocs != NULL)
2262 free (free_relocs);
2263 return true;
2264
2265 error_return:
2266 if (shndx_buf != NULL)
2267 free (shndx_buf);
2268 if (free_extsyms != NULL)
2269 free (free_extsyms);
2270 if (free_relocs != NULL)
2271 free (free_relocs);
2272 return false;
2273 }
2274
2275 static enum elf_reloc_type_class
2276 elf32_m68k_reloc_type_class (rela)
2277 const Elf_Internal_Rela *rela;
2278 {
2279 switch ((int) ELF32_R_TYPE (rela->r_info))
2280 {
2281 case R_68K_RELATIVE:
2282 return reloc_class_relative;
2283 case R_68K_JMP_SLOT:
2284 return reloc_class_plt;
2285 case R_68K_COPY:
2286 return reloc_class_copy;
2287 default:
2288 return reloc_class_normal;
2289 }
2290 }
2291
2292 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2293 #define TARGET_BIG_NAME "elf32-m68k"
2294 #define ELF_MACHINE_CODE EM_68K
2295 #define ELF_MAXPAGESIZE 0x2000
2296 #define elf_backend_create_dynamic_sections \
2297 _bfd_elf_create_dynamic_sections
2298 #define bfd_elf32_bfd_link_hash_table_create \
2299 elf_m68k_link_hash_table_create
2300 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2301
2302 #define elf_backend_check_relocs elf_m68k_check_relocs
2303 #define elf_backend_adjust_dynamic_symbol \
2304 elf_m68k_adjust_dynamic_symbol
2305 #define elf_backend_size_dynamic_sections \
2306 elf_m68k_size_dynamic_sections
2307 #define elf_backend_relocate_section elf_m68k_relocate_section
2308 #define elf_backend_finish_dynamic_symbol \
2309 elf_m68k_finish_dynamic_symbol
2310 #define elf_backend_finish_dynamic_sections \
2311 elf_m68k_finish_dynamic_sections
2312 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2313 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2314 #define bfd_elf32_bfd_merge_private_bfd_data \
2315 elf32_m68k_merge_private_bfd_data
2316 #define bfd_elf32_bfd_set_private_flags \
2317 elf32_m68k_set_private_flags
2318 #define bfd_elf32_bfd_print_private_bfd_data \
2319 elf32_m68k_print_private_bfd_data
2320 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2321
2322 #define elf_backend_can_gc_sections 1
2323 #define elf_backend_can_refcount 1
2324 #define elf_backend_want_got_plt 1
2325 #define elf_backend_plt_readonly 1
2326 #define elf_backend_want_plt_sym 0
2327 #define elf_backend_got_header_size 12
2328
2329 #include "elf32-target.h"
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