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* MAINTAINERS: Add myself as M88k maintainer.
[binutils.git] / bfd / elf32-m68k.c
blob99d97a5242ddcd882bf9bb81e4de4863d98c9ff6
1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 2004, 2005 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 *, Elf_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 bfd_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 ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
41 struct elf_link_hash_entry *, Elf_Internal_Sym *));
42 static bfd_boolean elf_m68k_gc_sweep_hook
43 PARAMS ((bfd *, struct bfd_link_info *, asection *,
44 const Elf_Internal_Rela *));
45 static bfd_boolean elf_m68k_adjust_dynamic_symbol
46 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
47 static bfd_boolean elf_m68k_size_dynamic_sections
48 PARAMS ((bfd *, struct bfd_link_info *));
49 static bfd_boolean elf_m68k_discard_copies
50 PARAMS ((struct elf_link_hash_entry *, PTR));
51 static bfd_boolean elf_m68k_relocate_section
52 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
53 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
54 static bfd_boolean elf_m68k_finish_dynamic_symbol
55 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
56 Elf_Internal_Sym *));
57 static bfd_boolean elf_m68k_finish_dynamic_sections
58 PARAMS ((bfd *, struct bfd_link_info *));
59
60 static bfd_boolean elf32_m68k_set_private_flags
61 PARAMS ((bfd *, flagword));
62 static bfd_boolean elf32_m68k_merge_private_bfd_data
63 PARAMS ((bfd *, bfd *));
64 static bfd_boolean elf32_m68k_print_private_bfd_data
65 PARAMS ((bfd *, PTR));
66 static enum elf_reloc_type_class elf32_m68k_reloc_type_class
67 PARAMS ((const Elf_Internal_Rela *));
68
69 static reloc_howto_type howto_table[] = {
70 HOWTO(R_68K_NONE, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", FALSE, 0, 0x00000000,FALSE),
71 HOWTO(R_68K_32, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", FALSE, 0, 0xffffffff,FALSE),
72 HOWTO(R_68K_16, 0, 1,16, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", FALSE, 0, 0x0000ffff,FALSE),
73 HOWTO(R_68K_8, 0, 0, 8, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", FALSE, 0, 0x000000ff,FALSE),
74 HOWTO(R_68K_PC32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", FALSE, 0, 0xffffffff,TRUE),
75 HOWTO(R_68K_PC16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", FALSE, 0, 0x0000ffff,TRUE),
76 HOWTO(R_68K_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", FALSE, 0, 0x000000ff,TRUE),
77 HOWTO(R_68K_GOT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", FALSE, 0, 0xffffffff,TRUE),
78 HOWTO(R_68K_GOT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", FALSE, 0, 0x0000ffff,TRUE),
79 HOWTO(R_68K_GOT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", FALSE, 0, 0x000000ff,TRUE),
80 HOWTO(R_68K_GOT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", FALSE, 0, 0xffffffff,FALSE),
81 HOWTO(R_68K_GOT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", FALSE, 0, 0x0000ffff,FALSE),
82 HOWTO(R_68K_GOT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", FALSE, 0, 0x000000ff,FALSE),
83 HOWTO(R_68K_PLT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", FALSE, 0, 0xffffffff,TRUE),
84 HOWTO(R_68K_PLT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", FALSE, 0, 0x0000ffff,TRUE),
85 HOWTO(R_68K_PLT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", FALSE, 0, 0x000000ff,TRUE),
86 HOWTO(R_68K_PLT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", FALSE, 0, 0xffffffff,FALSE),
87 HOWTO(R_68K_PLT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", FALSE, 0, 0x0000ffff,FALSE),
88 HOWTO(R_68K_PLT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", FALSE, 0, 0x000000ff,FALSE),
89 HOWTO(R_68K_COPY, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", FALSE, 0, 0xffffffff,FALSE),
90 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),
91 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),
92 HOWTO(R_68K_RELATIVE, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", FALSE, 0, 0xffffffff,FALSE),
93 /* GNU extension to record C++ vtable hierarchy. */
94 HOWTO (R_68K_GNU_VTINHERIT, /* type */
95 0, /* rightshift */
96 2, /* size (0 = byte, 1 = short, 2 = long) */
97 0, /* bitsize */
98 FALSE, /* pc_relative */
99 0, /* bitpos */
100 complain_overflow_dont, /* complain_on_overflow */
101 NULL, /* special_function */
102 "R_68K_GNU_VTINHERIT", /* name */
103 FALSE, /* partial_inplace */
104 0, /* src_mask */
105 0, /* dst_mask */
106 FALSE),
107 /* GNU extension to record C++ vtable member usage. */
108 HOWTO (R_68K_GNU_VTENTRY, /* type */
109 0, /* rightshift */
110 2, /* size (0 = byte, 1 = short, 2 = long) */
111 0, /* bitsize */
112 FALSE, /* pc_relative */
113 0, /* bitpos */
114 complain_overflow_dont, /* complain_on_overflow */
115 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
116 "R_68K_GNU_VTENTRY", /* name */
117 FALSE, /* partial_inplace */
118 0, /* src_mask */
119 0, /* dst_mask */
120 FALSE),
121 };
122
123 static void
124 rtype_to_howto (abfd, cache_ptr, dst)
125 bfd *abfd ATTRIBUTE_UNUSED;
126 arelent *cache_ptr;
127 Elf_Internal_Rela *dst;
128 {
129 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max);
130 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
131 }
132
133 #define elf_info_to_howto rtype_to_howto
134
135 static const struct
136 {
137 bfd_reloc_code_real_type bfd_val;
138 int elf_val;
139 } reloc_map[] = {
140 { BFD_RELOC_NONE, R_68K_NONE },
141 { BFD_RELOC_32, R_68K_32 },
142 { BFD_RELOC_16, R_68K_16 },
143 { BFD_RELOC_8, R_68K_8 },
144 { BFD_RELOC_32_PCREL, R_68K_PC32 },
145 { BFD_RELOC_16_PCREL, R_68K_PC16 },
146 { BFD_RELOC_8_PCREL, R_68K_PC8 },
147 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 },
148 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 },
149 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 },
150 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O },
151 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O },
152 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O },
153 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 },
154 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 },
155 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 },
156 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O },
157 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O },
158 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O },
159 { BFD_RELOC_NONE, R_68K_COPY },
160 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT },
161 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT },
162 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE },
163 { BFD_RELOC_CTOR, R_68K_32 },
164 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT },
165 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY },
166 };
167
168 static reloc_howto_type *
169 reloc_type_lookup (abfd, code)
170 bfd *abfd ATTRIBUTE_UNUSED;
171 bfd_reloc_code_real_type code;
172 {
173 unsigned int i;
174 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
175 {
176 if (reloc_map[i].bfd_val == code)
177 return &howto_table[reloc_map[i].elf_val];
178 }
179 return 0;
180 }
181
182 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
183 #define ELF_ARCH bfd_arch_m68k
184 \f
185 /* Functions for the m68k ELF linker. */
186
187 /* The name of the dynamic interpreter. This is put in the .interp
188 section. */
189
190 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
191
192 /* The size in bytes of an entry in the procedure linkage table. */
193
194 #define PLT_ENTRY_SIZE 20
195
196 /* The first entry in a procedure linkage table looks like this. See
197 the SVR4 ABI m68k supplement to see how this works. */
198
199 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
200 {
201 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
202 0, 0, 0, 0, /* replaced with offset to .got + 4. */
203 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
204 0, 0, 0, 0, /* replaced with offset to .got + 8. */
205 0, 0, 0, 0 /* pad out to 20 bytes. */
206 };
207
208 /* Subsequent entries in a procedure linkage table look like this. */
209
210 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
211 {
212 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
213 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
214 0x2f, 0x3c, /* move.l #offset,-(%sp) */
215 0, 0, 0, 0, /* replaced with offset into relocation table. */
216 0x60, 0xff, /* bra.l .plt */
217 0, 0, 0, 0 /* replaced with offset to start of .plt. */
218 };
219
220
221 #define CFV4E_PLT_ENTRY_SIZE 24
222
223 #define CFV4E_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CFV4E)
224
225 static const bfd_byte elf_cfv4e_plt0_entry[CFV4E_PLT_ENTRY_SIZE] =
226 {
227 0x20, 0x3c,
228 0, 0, 0, 0, /* Replaced with offset to .got + 4. */
229 0x2f, 0x3b, 0x08, 0xfa, /* move.l (%pc,addr),-(%sp) */
230 0x20, 0x3c,
231 0, 0, 0, 0, /* Replaced with offset to .got + 8. */
232 0x20, 0x7b, 0x08, 0x00, /* move.l (%pc,%d0:l), %a0 */
233 0x4e, 0xd0, /* jmp (%a0) */
234 0x4e, 0x71 /* nop */
235 };
236
237 /* Subsequent entries in a procedure linkage table look like this. */
238
239 static const bfd_byte elf_cfv4e_plt_entry[CFV4E_PLT_ENTRY_SIZE] =
240 {
241 0x20, 0x3c,
242 0, 0, 0, 0, /* Replaced with offset to symbol's .got entry. */
243 0x20, 0x7b, 0x08, 0x00, /* move.l (%pc,%d0:l), %a0 */
244 0x4e, 0xd0, /* jmp (%a0) */
245 0x2f, 0x3c, /* move.l #offset,-(%sp) */
246 0, 0, 0, 0, /* Replaced with offset into relocation table. */
247 0x60, 0xff, /* bra.l .plt */
248 0, 0, 0, 0 /* Replaced with offset to start of .plt. */
249 };
250
251 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
252
253 #define PLT_CPU32_ENTRY_SIZE 24
254 /* Procedure linkage table entries for the cpu32 */
255 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
256 {
257 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
258 0, 0, 0, 0, /* replaced with offset to .got + 4. */
259 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
260 0, 0, 0, 0, /* replace with offset to .got +8. */
261 0x4e, 0xd1, /* jmp %a1@ */
262 0, 0, 0, 0, /* pad out to 24 bytes. */
263 0, 0
264 };
265
266 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
267 {
268 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
269 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
270 0x4e, 0xd1, /* jmp %a1@ */
271 0x2f, 0x3c, /* move.l #offset,-(%sp) */
272 0, 0, 0, 0, /* replaced with offset into relocation table. */
273 0x60, 0xff, /* bra.l .plt */
274 0, 0, 0, 0, /* replaced with offset to start of .plt. */
275 0, 0
276 };
277
278 /* The m68k linker needs to keep track of the number of relocs that it
279 decides to copy in check_relocs for each symbol. This is so that it
280 can discard PC relative relocs if it doesn't need them when linking
281 with -Bsymbolic. We store the information in a field extending the
282 regular ELF linker hash table. */
283
284 /* This structure keeps track of the number of PC relative relocs we have
285 copied for a given symbol. */
286
287 struct elf_m68k_pcrel_relocs_copied
288 {
289 /* Next section. */
290 struct elf_m68k_pcrel_relocs_copied *next;
291 /* A section in dynobj. */
292 asection *section;
293 /* Number of relocs copied in this section. */
294 bfd_size_type count;
295 };
296
297 /* m68k ELF linker hash entry. */
298
299 struct elf_m68k_link_hash_entry
300 {
301 struct elf_link_hash_entry root;
302
303 /* Number of PC relative relocs copied for this symbol. */
304 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
305 };
306
307 #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent))
308
309 /* m68k ELF linker hash table. */
310
311 struct elf_m68k_link_hash_table
312 {
313 struct elf_link_hash_table root;
314
315 /* Small local sym to section mapping cache. */
316 struct sym_sec_cache sym_sec;
317 };
318
319 /* Get the m68k ELF linker hash table from a link_info structure. */
320
321 #define elf_m68k_hash_table(p) \
322 ((struct elf_m68k_link_hash_table *) (p)->hash)
323
324 /* Create an entry in an m68k ELF linker hash table. */
325
326 static struct bfd_hash_entry *
327 elf_m68k_link_hash_newfunc (entry, table, string)
328 struct bfd_hash_entry *entry;
329 struct bfd_hash_table *table;
330 const char *string;
331 {
332 struct bfd_hash_entry *ret = entry;
333
334 /* Allocate the structure if it has not already been allocated by a
335 subclass. */
336 if (ret == NULL)
337 ret = bfd_hash_allocate (table,
338 sizeof (struct elf_m68k_link_hash_entry));
339 if (ret == NULL)
340 return ret;
341
342 /* Call the allocation method of the superclass. */
343 ret = _bfd_elf_link_hash_newfunc (ret, table, string);
344 if (ret != NULL)
345 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL;
346
347 return ret;
348 }
349
350 /* Create an m68k ELF linker hash table. */
351
352 static struct bfd_link_hash_table *
353 elf_m68k_link_hash_table_create (abfd)
354 bfd *abfd;
355 {
356 struct elf_m68k_link_hash_table *ret;
357 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table);
358
359 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt);
360 if (ret == (struct elf_m68k_link_hash_table *) NULL)
361 return NULL;
362
363 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
364 elf_m68k_link_hash_newfunc))
365 {
366 free (ret);
367 return NULL;
368 }
369
370 ret->sym_sec.abfd = NULL;
371
372 return &ret->root.root;
373 }
374
375 /* Keep m68k-specific flags in the ELF header. */
376 static bfd_boolean
377 elf32_m68k_set_private_flags (abfd, flags)
378 bfd *abfd;
379 flagword flags;
380 {
381 elf_elfheader (abfd)->e_flags = flags;
382 elf_flags_init (abfd) = TRUE;
383 return TRUE;
384 }
385
386 /* Merge backend specific data from an object file to the output
387 object file when linking. */
388 static bfd_boolean
389 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
390 bfd *ibfd;
391 bfd *obfd;
392 {
393 flagword out_flags;
394 flagword in_flags;
395
396 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
397 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
398 return TRUE;
399
400 in_flags = elf_elfheader (ibfd)->e_flags;
401 out_flags = elf_elfheader (obfd)->e_flags;
402
403 if (!elf_flags_init (obfd))
404 {
405 elf_flags_init (obfd) = TRUE;
406 elf_elfheader (obfd)->e_flags = in_flags;
407 }
408
409 return TRUE;
410 }
411
412 /* Display the flags field. */
413 static bfd_boolean
414 elf32_m68k_print_private_bfd_data (abfd, ptr)
415 bfd *abfd;
416 PTR ptr;
417 {
418 FILE *file = (FILE *) ptr;
419
420 BFD_ASSERT (abfd != NULL && ptr != NULL);
421
422 /* Print normal ELF private data. */
423 _bfd_elf_print_private_bfd_data (abfd, ptr);
424
425 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
426
427 /* xgettext:c-format */
428 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
429
430 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
431 fprintf (file, _(" [cpu32]"));
432
433 if (elf_elfheader (abfd)->e_flags & EF_M68000)
434 fprintf (file, _(" [m68000]"));
435
436 fputc ('\n', file);
437
438 return TRUE;
439 }
440 /* Look through the relocs for a section during the first phase, and
441 allocate space in the global offset table or procedure linkage
442 table. */
443
444 static bfd_boolean
445 elf_m68k_check_relocs (abfd, info, sec, relocs)
446 bfd *abfd;
447 struct bfd_link_info *info;
448 asection *sec;
449 const Elf_Internal_Rela *relocs;
450 {
451 bfd *dynobj;
452 Elf_Internal_Shdr *symtab_hdr;
453 struct elf_link_hash_entry **sym_hashes;
454 bfd_signed_vma *local_got_refcounts;
455 const Elf_Internal_Rela *rel;
456 const Elf_Internal_Rela *rel_end;
457 asection *sgot;
458 asection *srelgot;
459 asection *sreloc;
460
461 if (info->relocatable)
462 return TRUE;
463
464 dynobj = elf_hash_table (info)->dynobj;
465 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
466 sym_hashes = elf_sym_hashes (abfd);
467 local_got_refcounts = elf_local_got_refcounts (abfd);
468
469 sgot = NULL;
470 srelgot = NULL;
471 sreloc = NULL;
472
473 rel_end = relocs + sec->reloc_count;
474 for (rel = relocs; rel < rel_end; rel++)
475 {
476 unsigned long r_symndx;
477 struct elf_link_hash_entry *h;
478
479 r_symndx = ELF32_R_SYM (rel->r_info);
480
481 if (r_symndx < symtab_hdr->sh_info)
482 h = NULL;
483 else
484 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
485
486 switch (ELF32_R_TYPE (rel->r_info))
487 {
488 case R_68K_GOT8:
489 case R_68K_GOT16:
490 case R_68K_GOT32:
491 if (h != NULL
492 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
493 break;
494 /* Fall through. */
495 case R_68K_GOT8O:
496 case R_68K_GOT16O:
497 case R_68K_GOT32O:
498 /* This symbol requires a global offset table entry. */
499
500 if (dynobj == NULL)
501 {
502 /* Create the .got section. */
503 elf_hash_table (info)->dynobj = dynobj = abfd;
504 if (!_bfd_elf_create_got_section (dynobj, info))
505 return FALSE;
506 }
507
508 if (sgot == NULL)
509 {
510 sgot = bfd_get_section_by_name (dynobj, ".got");
511 BFD_ASSERT (sgot != NULL);
512 }
513
514 if (srelgot == NULL
515 && (h != NULL || info->shared))
516 {
517 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
518 if (srelgot == NULL)
519 {
520 srelgot = bfd_make_section (dynobj, ".rela.got");
521 if (srelgot == NULL
522 || !bfd_set_section_flags (dynobj, srelgot,
523 (SEC_ALLOC
524 | SEC_LOAD
525 | SEC_HAS_CONTENTS
526 | SEC_IN_MEMORY
527 | SEC_LINKER_CREATED
528 | SEC_READONLY))
529 || !bfd_set_section_alignment (dynobj, srelgot, 2))
530 return FALSE;
531 }
532 }
533
534 if (h != NULL)
535 {
536 if (h->got.refcount == 0)
537 {
538 /* Make sure this symbol is output as a dynamic symbol. */
539 if (h->dynindx == -1
540 && !h->forced_local)
541 {
542 if (!bfd_elf_link_record_dynamic_symbol (info, h))
543 return FALSE;
544 }
545
546 /* Allocate space in the .got section. */
547 sgot->size += 4;
548 /* Allocate relocation space. */
549 srelgot->size += sizeof (Elf32_External_Rela);
550 }
551 h->got.refcount++;
552 }
553 else
554 {
555 /* This is a global offset table entry for a local symbol. */
556 if (local_got_refcounts == NULL)
557 {
558 bfd_size_type size;
559
560 size = symtab_hdr->sh_info;
561 size *= sizeof (bfd_signed_vma);
562 local_got_refcounts = ((bfd_signed_vma *)
563 bfd_zalloc (abfd, size));
564 if (local_got_refcounts == NULL)
565 return FALSE;
566 elf_local_got_refcounts (abfd) = local_got_refcounts;
567 }
568 if (local_got_refcounts[r_symndx] == 0)
569 {
570 sgot->size += 4;
571 if (info->shared)
572 {
573 /* If we are generating a shared object, we need to
574 output a R_68K_RELATIVE reloc so that the dynamic
575 linker can adjust this GOT entry. */
576 srelgot->size += sizeof (Elf32_External_Rela);
577 }
578 }
579 local_got_refcounts[r_symndx]++;
580 }
581 break;
582
583 case R_68K_PLT8:
584 case R_68K_PLT16:
585 case R_68K_PLT32:
586 /* This symbol requires a procedure linkage table entry. We
587 actually build the entry in adjust_dynamic_symbol,
588 because this might be a case of linking PIC code which is
589 never referenced by a dynamic object, in which case we
590 don't need to generate a procedure linkage table entry
591 after all. */
592
593 /* If this is a local symbol, we resolve it directly without
594 creating a procedure linkage table entry. */
595 if (h == NULL)
596 continue;
597
598 h->needs_plt = 1;
599 h->plt.refcount++;
600 break;
601
602 case R_68K_PLT8O:
603 case R_68K_PLT16O:
604 case R_68K_PLT32O:
605 /* This symbol requires a procedure linkage table entry. */
606
607 if (h == NULL)
608 {
609 /* It does not make sense to have this relocation for a
610 local symbol. FIXME: does it? How to handle it if
611 it does make sense? */
612 bfd_set_error (bfd_error_bad_value);
613 return FALSE;
614 }
615
616 /* Make sure this symbol is output as a dynamic symbol. */
617 if (h->dynindx == -1
618 && !h->forced_local)
619 {
620 if (!bfd_elf_link_record_dynamic_symbol (info, h))
621 return FALSE;
622 }
623
624 h->needs_plt = 1;
625 h->plt.refcount++;
626 break;
627
628 case R_68K_PC8:
629 case R_68K_PC16:
630 case R_68K_PC32:
631 /* If we are creating a shared library and this is not a local
632 symbol, we need to copy the reloc into the shared library.
633 However when linking with -Bsymbolic and this is a global
634 symbol which is defined in an object we are including in the
635 link (i.e., DEF_REGULAR is set), then we can resolve the
636 reloc directly. At this point we have not seen all the input
637 files, so it is possible that DEF_REGULAR is not set now but
638 will be set later (it is never cleared). We account for that
639 possibility below by storing information in the
640 pcrel_relocs_copied field of the hash table entry. */
641 if (!(info->shared
642 && (sec->flags & SEC_ALLOC) != 0
643 && h != NULL
644 && (!info->symbolic
645 || h->root.type == bfd_link_hash_defweak
646 || !h->def_regular)))
647 {
648 if (h != NULL)
649 {
650 /* Make sure a plt entry is created for this symbol if
651 it turns out to be a function defined by a dynamic
652 object. */
653 h->plt.refcount++;
654 }
655 break;
656 }
657 /* Fall through. */
658 case R_68K_8:
659 case R_68K_16:
660 case R_68K_32:
661 if (h != NULL)
662 {
663 /* Make sure a plt entry is created for this symbol if it
664 turns out to be a function defined by a dynamic object. */
665 h->plt.refcount++;
666 }
667
668 /* If we are creating a shared library, we need to copy the
669 reloc into the shared library. */
670 if (info->shared
671 && (sec->flags & SEC_ALLOC) != 0)
672 {
673 /* When creating a shared object, we must copy these
674 reloc types into the output file. We create a reloc
675 section in dynobj and make room for this reloc. */
676 if (sreloc == NULL)
677 {
678 const char *name;
679
680 name = (bfd_elf_string_from_elf_section
681 (abfd,
682 elf_elfheader (abfd)->e_shstrndx,
683 elf_section_data (sec)->rel_hdr.sh_name));
684 if (name == NULL)
685 return FALSE;
686
687 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
688 && strcmp (bfd_get_section_name (abfd, sec),
689 name + 5) == 0);
690
691 sreloc = bfd_get_section_by_name (dynobj, name);
692 if (sreloc == NULL)
693 {
694 sreloc = bfd_make_section (dynobj, name);
695 if (sreloc == NULL
696 || !bfd_set_section_flags (dynobj, sreloc,
697 (SEC_ALLOC
698 | SEC_LOAD
699 | SEC_HAS_CONTENTS
700 | SEC_IN_MEMORY
701 | SEC_LINKER_CREATED
702 | SEC_READONLY))
703 || !bfd_set_section_alignment (dynobj, sreloc, 2))
704 return FALSE;
705 }
706 elf_section_data (sec)->sreloc = sreloc;
707 }
708
709 if (sec->flags & SEC_READONLY
710 /* Don't set DF_TEXTREL yet for PC relative
711 relocations, they might be discarded later. */
712 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8
713 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
714 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32))
715 info->flags |= DF_TEXTREL;
716
717 sreloc->size += sizeof (Elf32_External_Rela);
718
719 /* We count the number of PC relative relocations we have
720 entered for this symbol, so that we can discard them
721 again if, in the -Bsymbolic case, the symbol is later
722 defined by a regular object, or, in the normal shared
723 case, the symbol is forced to be local. Note that this
724 function is only called if we are using an m68kelf linker
725 hash table, which means that h is really a pointer to an
726 elf_m68k_link_hash_entry. */
727 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8
728 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
729 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
730 {
731 struct elf_m68k_pcrel_relocs_copied *p;
732 struct elf_m68k_pcrel_relocs_copied **head;
733
734 if (h != NULL)
735 {
736 struct elf_m68k_link_hash_entry *eh
737 = elf_m68k_hash_entry (h);
738 head = &eh->pcrel_relocs_copied;
739 }
740 else
741 {
742 asection *s;
743 s = (bfd_section_from_r_symndx
744 (abfd, &elf_m68k_hash_table (info)->sym_sec,
745 sec, r_symndx));
746 if (s == NULL)
747 return FALSE;
748
749 head = ((struct elf_m68k_pcrel_relocs_copied **)
750 &elf_section_data (s)->local_dynrel);
751 }
752
753 for (p = *head; p != NULL; p = p->next)
754 if (p->section == sreloc)
755 break;
756
757 if (p == NULL)
758 {
759 p = ((struct elf_m68k_pcrel_relocs_copied *)
760 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
761 if (p == NULL)
762 return FALSE;
763 p->next = *head;
764 *head = p;
765 p->section = sreloc;
766 p->count = 0;
767 }
768
769 ++p->count;
770 }
771 }
772
773 break;
774
775 /* This relocation describes the C++ object vtable hierarchy.
776 Reconstruct it for later use during GC. */
777 case R_68K_GNU_VTINHERIT:
778 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
779 return FALSE;
780 break;
781
782 /* This relocation describes which C++ vtable entries are actually
783 used. Record for later use during GC. */
784 case R_68K_GNU_VTENTRY:
785 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
786 return FALSE;
787 break;
788
789 default:
790 break;
791 }
792 }
793
794 return TRUE;
795 }
796
797 /* Return the section that should be marked against GC for a given
798 relocation. */
799
800 static asection *
801 elf_m68k_gc_mark_hook (sec, info, rel, h, sym)
802 asection *sec;
803 struct bfd_link_info *info ATTRIBUTE_UNUSED;
804 Elf_Internal_Rela *rel;
805 struct elf_link_hash_entry *h;
806 Elf_Internal_Sym *sym;
807 {
808 if (h != NULL)
809 {
810 switch (ELF32_R_TYPE (rel->r_info))
811 {
812 case R_68K_GNU_VTINHERIT:
813 case R_68K_GNU_VTENTRY:
814 break;
815
816 default:
817 switch (h->root.type)
818 {
819 default:
820 break;
821
822 case bfd_link_hash_defined:
823 case bfd_link_hash_defweak:
824 return h->root.u.def.section;
825
826 case bfd_link_hash_common:
827 return h->root.u.c.p->section;
828 }
829 }
830 }
831 else
832 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
833
834 return NULL;
835 }
836
837 /* Update the got entry reference counts for the section being removed. */
838
839 static bfd_boolean
840 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
841 bfd *abfd;
842 struct bfd_link_info *info;
843 asection *sec;
844 const Elf_Internal_Rela *relocs;
845 {
846 Elf_Internal_Shdr *symtab_hdr;
847 struct elf_link_hash_entry **sym_hashes;
848 bfd_signed_vma *local_got_refcounts;
849 const Elf_Internal_Rela *rel, *relend;
850 bfd *dynobj;
851 asection *sgot;
852 asection *srelgot;
853
854 dynobj = elf_hash_table (info)->dynobj;
855 if (dynobj == NULL)
856 return TRUE;
857
858 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
859 sym_hashes = elf_sym_hashes (abfd);
860 local_got_refcounts = elf_local_got_refcounts (abfd);
861
862 sgot = bfd_get_section_by_name (dynobj, ".got");
863 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
864
865 relend = relocs + sec->reloc_count;
866 for (rel = relocs; rel < relend; rel++)
867 {
868 unsigned long r_symndx;
869 struct elf_link_hash_entry *h = NULL;
870
871 r_symndx = ELF32_R_SYM (rel->r_info);
872 if (r_symndx >= symtab_hdr->sh_info)
873 {
874 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
875 while (h->root.type == bfd_link_hash_indirect
876 || h->root.type == bfd_link_hash_warning)
877 h = (struct elf_link_hash_entry *) h->root.u.i.link;
878 }
879
880 switch (ELF32_R_TYPE (rel->r_info))
881 {
882 case R_68K_GOT8:
883 case R_68K_GOT16:
884 case R_68K_GOT32:
885 case R_68K_GOT8O:
886 case R_68K_GOT16O:
887 case R_68K_GOT32O:
888 if (h != NULL)
889 {
890 if (h->got.refcount > 0)
891 {
892 --h->got.refcount;
893 if (h->got.refcount == 0)
894 {
895 /* We don't need the .got entry any more. */
896 sgot->size -= 4;
897 srelgot->size -= sizeof (Elf32_External_Rela);
898 }
899 }
900 }
901 else if (local_got_refcounts != NULL)
902 {
903 if (local_got_refcounts[r_symndx] > 0)
904 {
905 --local_got_refcounts[r_symndx];
906 if (local_got_refcounts[r_symndx] == 0)
907 {
908 /* We don't need the .got entry any more. */
909 sgot->size -= 4;
910 if (info->shared)
911 srelgot->size -= sizeof (Elf32_External_Rela);
912 }
913 }
914 }
915 break;
916
917 case R_68K_PLT8:
918 case R_68K_PLT16:
919 case R_68K_PLT32:
920 case R_68K_PLT8O:
921 case R_68K_PLT16O:
922 case R_68K_PLT32O:
923 case R_68K_PC8:
924 case R_68K_PC16:
925 case R_68K_PC32:
926 case R_68K_8:
927 case R_68K_16:
928 case R_68K_32:
929 if (h != NULL)
930 {
931 if (h->plt.refcount > 0)
932 --h->plt.refcount;
933 }
934 break;
935
936 default:
937 break;
938 }
939 }
940
941 return TRUE;
942 }
943
944 /* Adjust a symbol defined by a dynamic object and referenced by a
945 regular object. The current definition is in some section of the
946 dynamic object, but we're not including those sections. We have to
947 change the definition to something the rest of the link can
948 understand. */
949
950 static bfd_boolean
951 elf_m68k_adjust_dynamic_symbol (info, h)
952 struct bfd_link_info *info;
953 struct elf_link_hash_entry *h;
954 {
955 bfd *dynobj;
956 asection *s;
957 unsigned int power_of_two;
958
959 dynobj = elf_hash_table (info)->dynobj;
960
961 /* Make sure we know what is going on here. */
962 BFD_ASSERT (dynobj != NULL
963 && (h->needs_plt
964 || h->u.weakdef != NULL
965 || (h->def_dynamic
966 && h->ref_regular
967 && !h->def_regular)));
968
969 /* If this is a function, put it in the procedure linkage table. We
970 will fill in the contents of the procedure linkage table later,
971 when we know the address of the .got section. */
972 if (h->type == STT_FUNC
973 || h->needs_plt)
974 {
975 if ((h->plt.refcount <= 0
976 || SYMBOL_CALLS_LOCAL (info, h)
977 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
978 && h->root.type == bfd_link_hash_undefweak))
979 /* We must always create the plt entry if it was referenced
980 by a PLTxxO relocation. In this case we already recorded
981 it as a dynamic symbol. */
982 && h->dynindx == -1)
983 {
984 /* This case can occur if we saw a PLTxx reloc in an input
985 file, but the symbol was never referred to by a dynamic
986 object, or if all references were garbage collected. In
987 such a case, we don't actually need to build a procedure
988 linkage table, and we can just do a PCxx reloc instead. */
989 h->plt.offset = (bfd_vma) -1;
990 h->needs_plt = 0;
991 return TRUE;
992 }
993
994 /* Make sure this symbol is output as a dynamic symbol. */
995 if (h->dynindx == -1
996 && !h->forced_local)
997 {
998 if (! bfd_elf_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->size == 0)
1008 {
1009 if (CPU32_FLAG (dynobj))
1010 s->size += PLT_CPU32_ENTRY_SIZE;
1011 else if (CFV4E_FLAG (dynobj))
1012 s->size += CFV4E_PLT_ENTRY_SIZE;
1013 else
1014 s->size += PLT_ENTRY_SIZE;
1015 }
1016
1017 /* If this symbol is not defined in a regular file, and we are
1018 not generating a shared library, then set the symbol to this
1019 location in the .plt. This is required to make function
1020 pointers compare as equal between the normal executable and
1021 the shared library. */
1022 if (!info->shared
1023 && !h->def_regular)
1024 {
1025 h->root.u.def.section = s;
1026 h->root.u.def.value = s->size;
1027 }
1028
1029 h->plt.offset = s->size;
1030
1031 /* Make room for this entry. */
1032 if (CPU32_FLAG (dynobj))
1033 s->size += PLT_CPU32_ENTRY_SIZE;
1034 else if (CFV4E_FLAG (dynobj))
1035 s->size += CFV4E_PLT_ENTRY_SIZE;
1036 else
1037 s->size += PLT_ENTRY_SIZE;
1038
1039 /* We also need to make an entry in the .got.plt section, which
1040 will be placed in the .got section by the linker script. */
1041 s = bfd_get_section_by_name (dynobj, ".got.plt");
1042 BFD_ASSERT (s != NULL);
1043 s->size += 4;
1044
1045 /* We also need to make an entry in the .rela.plt section. */
1046 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1047 BFD_ASSERT (s != NULL);
1048 s->size += sizeof (Elf32_External_Rela);
1049
1050 return TRUE;
1051 }
1052
1053 /* Reinitialize the plt offset now that it is not used as a reference
1054 count any more. */
1055 h->plt.offset = (bfd_vma) -1;
1056
1057 /* If this is a weak symbol, and there is a real definition, the
1058 processor independent code will have arranged for us to see the
1059 real definition first, and we can just use the same value. */
1060 if (h->u.weakdef != NULL)
1061 {
1062 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1063 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1064 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1065 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1066 return TRUE;
1067 }
1068
1069 /* This is a reference to a symbol defined by a dynamic object which
1070 is not a function. */
1071
1072 /* If we are creating a shared library, we must presume that the
1073 only references to the symbol are via the global offset table.
1074 For such cases we need not do anything here; the relocations will
1075 be handled correctly by relocate_section. */
1076 if (info->shared)
1077 return TRUE;
1078
1079 /* We must allocate the symbol in our .dynbss section, which will
1080 become part of the .bss section of the executable. There will be
1081 an entry for this symbol in the .dynsym section. The dynamic
1082 object will contain position independent code, so all references
1083 from the dynamic object to this symbol will go through the global
1084 offset table. The dynamic linker will use the .dynsym entry to
1085 determine the address it must put in the global offset table, so
1086 both the dynamic object and the regular object will refer to the
1087 same memory location for the variable. */
1088
1089 s = bfd_get_section_by_name (dynobj, ".dynbss");
1090 BFD_ASSERT (s != NULL);
1091
1092 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1093 copy the initial value out of the dynamic object and into the
1094 runtime process image. We need to remember the offset into the
1095 .rela.bss section we are going to use. */
1096 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1097 {
1098 asection *srel;
1099
1100 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1101 BFD_ASSERT (srel != NULL);
1102 srel->size += sizeof (Elf32_External_Rela);
1103 h->needs_copy = 1;
1104 }
1105
1106 /* We need to figure out the alignment required for this symbol. I
1107 have no idea how ELF linkers handle this. */
1108 power_of_two = bfd_log2 (h->size);
1109 if (power_of_two > 3)
1110 power_of_two = 3;
1111
1112 /* Apply the required alignment. */
1113 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1114 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1115 {
1116 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1117 return FALSE;
1118 }
1119
1120 /* Define the symbol as being at this point in the section. */
1121 h->root.u.def.section = s;
1122 h->root.u.def.value = s->size;
1123
1124 /* Increment the section size to make room for the symbol. */
1125 s->size += h->size;
1126
1127 return TRUE;
1128 }
1129
1130 /* Set the sizes of the dynamic sections. */
1131
1132 static bfd_boolean
1133 elf_m68k_size_dynamic_sections (output_bfd, info)
1134 bfd *output_bfd ATTRIBUTE_UNUSED;
1135 struct bfd_link_info *info;
1136 {
1137 bfd *dynobj;
1138 asection *s;
1139 bfd_boolean plt;
1140 bfd_boolean relocs;
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->executable)
1149 {
1150 s = bfd_get_section_by_name (dynobj, ".interp");
1151 BFD_ASSERT (s != NULL);
1152 s->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->size = 0;
1166 }
1167
1168 /* If this is a -Bsymbolic shared link, then we need to discard all
1169 PC relative relocs against symbols defined in a regular object.
1170 For the normal shared case we discard the PC relative relocs
1171 against symbols that have become local due to visibility changes.
1172 We allocated space for them in the check_relocs routine, but we
1173 will not fill them in in the relocate_section routine. */
1174 if (info->shared)
1175 elf_link_hash_traverse (elf_hash_table (info),
1176 elf_m68k_discard_copies,
1177 (PTR) info);
1178
1179 /* The check_relocs and adjust_dynamic_symbol entry points have
1180 determined the sizes of the various dynamic sections. Allocate
1181 memory for them. */
1182 plt = FALSE;
1183 relocs = FALSE;
1184 for (s = dynobj->sections; s != NULL; s = s->next)
1185 {
1186 const char *name;
1187 bfd_boolean strip;
1188
1189 if ((s->flags & SEC_LINKER_CREATED) == 0)
1190 continue;
1191
1192 /* It's OK to base decisions on the section name, because none
1193 of the dynobj section names depend upon the input files. */
1194 name = bfd_get_section_name (dynobj, s);
1195
1196 strip = FALSE;
1197
1198 if (strcmp (name, ".plt") == 0)
1199 {
1200 if (s->size == 0)
1201 {
1202 /* Strip this section if we don't need it; see the
1203 comment below. */
1204 strip = TRUE;
1205 }
1206 else
1207 {
1208 /* Remember whether there is a PLT. */
1209 plt = TRUE;
1210 }
1211 }
1212 else if (strncmp (name, ".rela", 5) == 0)
1213 {
1214 if (s->size == 0)
1215 {
1216 /* If we don't need this section, strip it from the
1217 output file. This is mostly to handle .rela.bss and
1218 .rela.plt. We must create both sections in
1219 create_dynamic_sections, because they must be created
1220 before the linker maps input sections to output
1221 sections. The linker does that before
1222 adjust_dynamic_symbol is called, and it is that
1223 function which decides whether anything needs to go
1224 into these sections. */
1225 strip = TRUE;
1226 }
1227 else
1228 {
1229 relocs = TRUE;
1230
1231 /* We use the reloc_count field as a counter if we need
1232 to copy relocs into the output file. */
1233 s->reloc_count = 0;
1234 }
1235 }
1236 else if (strncmp (name, ".got", 4) != 0)
1237 {
1238 /* It's not one of our sections, so don't allocate space. */
1239 continue;
1240 }
1241
1242 if (strip)
1243 {
1244 _bfd_strip_section_from_output (info, s);
1245 continue;
1246 }
1247
1248 /* Allocate memory for the section contents. */
1249 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1250 Unused entries should be reclaimed before the section's contents
1251 are written out, but at the moment this does not happen. Thus in
1252 order to prevent writing out garbage, we initialise the section's
1253 contents to zero. */
1254 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1255 if (s->contents == NULL && s->size != 0)
1256 return FALSE;
1257 }
1258
1259 if (elf_hash_table (info)->dynamic_sections_created)
1260 {
1261 /* Add some entries to the .dynamic section. We fill in the
1262 values later, in elf_m68k_finish_dynamic_sections, but we
1263 must add the entries now so that we get the correct size for
1264 the .dynamic section. The DT_DEBUG entry is filled in by the
1265 dynamic linker and used by the debugger. */
1266 #define add_dynamic_entry(TAG, VAL) \
1267 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1268
1269 if (!info->shared)
1270 {
1271 if (!add_dynamic_entry (DT_DEBUG, 0))
1272 return FALSE;
1273 }
1274
1275 if (plt)
1276 {
1277 if (!add_dynamic_entry (DT_PLTGOT, 0)
1278 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1279 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1280 || !add_dynamic_entry (DT_JMPREL, 0))
1281 return FALSE;
1282 }
1283
1284 if (relocs)
1285 {
1286 if (!add_dynamic_entry (DT_RELA, 0)
1287 || !add_dynamic_entry (DT_RELASZ, 0)
1288 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1289 return FALSE;
1290 }
1291
1292 if ((info->flags & DF_TEXTREL) != 0)
1293 {
1294 if (!add_dynamic_entry (DT_TEXTREL, 0))
1295 return FALSE;
1296 }
1297 }
1298 #undef add_dynamic_entry
1299
1300 return TRUE;
1301 }
1302
1303 /* This function is called via elf_link_hash_traverse if we are
1304 creating a shared object. In the -Bsymbolic case it discards the
1305 space allocated to copy PC relative relocs against symbols which
1306 are defined in regular objects. For the normal shared case, it
1307 discards space for pc-relative relocs that have become local due to
1308 symbol visibility changes. We allocated space for them in the
1309 check_relocs routine, but we won't fill them in in the
1310 relocate_section routine.
1311
1312 We also check whether any of the remaining relocations apply
1313 against a readonly section, and set the DF_TEXTREL flag in this
1314 case. */
1315
1316 static bfd_boolean
1317 elf_m68k_discard_copies (h, inf)
1318 struct elf_link_hash_entry *h;
1319 PTR inf;
1320 {
1321 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1322 struct elf_m68k_pcrel_relocs_copied *s;
1323
1324 if (h->root.type == bfd_link_hash_warning)
1325 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1326
1327 if (!h->def_regular
1328 || (!info->symbolic
1329 && !h->forced_local))
1330 {
1331 if ((info->flags & DF_TEXTREL) == 0)
1332 {
1333 /* Look for relocations against read-only sections. */
1334 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1335 s != NULL;
1336 s = s->next)
1337 if ((s->section->flags & SEC_READONLY) != 0)
1338 {
1339 info->flags |= DF_TEXTREL;
1340 break;
1341 }
1342 }
1343
1344 return TRUE;
1345 }
1346
1347 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1348 s != NULL;
1349 s = s->next)
1350 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1351
1352 return TRUE;
1353 }
1354
1355 /* Relocate an M68K ELF section. */
1356
1357 static bfd_boolean
1358 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1359 contents, relocs, local_syms, local_sections)
1360 bfd *output_bfd;
1361 struct bfd_link_info *info;
1362 bfd *input_bfd;
1363 asection *input_section;
1364 bfd_byte *contents;
1365 Elf_Internal_Rela *relocs;
1366 Elf_Internal_Sym *local_syms;
1367 asection **local_sections;
1368 {
1369 bfd *dynobj;
1370 Elf_Internal_Shdr *symtab_hdr;
1371 struct elf_link_hash_entry **sym_hashes;
1372 bfd_vma *local_got_offsets;
1373 asection *sgot;
1374 asection *splt;
1375 asection *sreloc;
1376 Elf_Internal_Rela *rel;
1377 Elf_Internal_Rela *relend;
1378
1379 if (info->relocatable)
1380 return TRUE;
1381
1382 dynobj = elf_hash_table (info)->dynobj;
1383 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1384 sym_hashes = elf_sym_hashes (input_bfd);
1385 local_got_offsets = elf_local_got_offsets (input_bfd);
1386
1387 sgot = NULL;
1388 splt = NULL;
1389 sreloc = NULL;
1390
1391 rel = relocs;
1392 relend = relocs + input_section->reloc_count;
1393 for (; rel < relend; rel++)
1394 {
1395 int r_type;
1396 reloc_howto_type *howto;
1397 unsigned long r_symndx;
1398 struct elf_link_hash_entry *h;
1399 Elf_Internal_Sym *sym;
1400 asection *sec;
1401 bfd_vma relocation;
1402 bfd_boolean unresolved_reloc;
1403 bfd_reloc_status_type r;
1404
1405 r_type = ELF32_R_TYPE (rel->r_info);
1406 if (r_type < 0 || r_type >= (int) R_68K_max)
1407 {
1408 bfd_set_error (bfd_error_bad_value);
1409 return FALSE;
1410 }
1411 howto = howto_table + r_type;
1412
1413 r_symndx = ELF32_R_SYM (rel->r_info);
1414
1415 h = NULL;
1416 sym = NULL;
1417 sec = NULL;
1418 unresolved_reloc = FALSE;
1419
1420 if (r_symndx < symtab_hdr->sh_info)
1421 {
1422 sym = local_syms + r_symndx;
1423 sec = local_sections[r_symndx];
1424 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1425 }
1426 else
1427 {
1428 bfd_boolean warned;
1429
1430 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1431 r_symndx, symtab_hdr, sym_hashes,
1432 h, sec, relocation,
1433 unresolved_reloc, warned);
1434 }
1435
1436 switch (r_type)
1437 {
1438 case R_68K_GOT8:
1439 case R_68K_GOT16:
1440 case R_68K_GOT32:
1441 /* Relocation is to the address of the entry for this symbol
1442 in the global offset table. */
1443 if (h != NULL
1444 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1445 break;
1446 /* Fall through. */
1447 case R_68K_GOT8O:
1448 case R_68K_GOT16O:
1449 case R_68K_GOT32O:
1450 /* Relocation is the offset of the entry for this symbol in
1451 the global offset table. */
1452
1453 {
1454 bfd_vma off;
1455
1456 if (sgot == NULL)
1457 {
1458 sgot = bfd_get_section_by_name (dynobj, ".got");
1459 BFD_ASSERT (sgot != NULL);
1460 }
1461
1462 if (h != NULL)
1463 {
1464 bfd_boolean dyn;
1465
1466 off = h->got.offset;
1467 BFD_ASSERT (off != (bfd_vma) -1);
1468
1469 dyn = elf_hash_table (info)->dynamic_sections_created;
1470 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1471 || (info->shared
1472 && (info->symbolic
1473 || h->dynindx == -1
1474 || h->forced_local)
1475 && h->def_regular))
1476 {
1477 /* This is actually a static link, or it is a
1478 -Bsymbolic link and the symbol is defined
1479 locally, or the symbol was forced to be local
1480 because of a version file.. We must initialize
1481 this entry in the global offset table. Since
1482 the offset must always be a multiple of 4, we
1483 use the least significant bit to record whether
1484 we have initialized it already.
1485
1486 When doing a dynamic link, we create a .rela.got
1487 relocation entry to initialize the value. This
1488 is done in the finish_dynamic_symbol routine. */
1489 if ((off & 1) != 0)
1490 off &= ~1;
1491 else
1492 {
1493 bfd_put_32 (output_bfd, relocation,
1494 sgot->contents + off);
1495 h->got.offset |= 1;
1496 }
1497 }
1498 else
1499 unresolved_reloc = FALSE;
1500 }
1501 else
1502 {
1503 BFD_ASSERT (local_got_offsets != NULL
1504 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1505
1506 off = local_got_offsets[r_symndx];
1507
1508 /* The offset must always be a multiple of 4. We use
1509 the least significant bit to record whether we have
1510 already generated the necessary reloc. */
1511 if ((off & 1) != 0)
1512 off &= ~1;
1513 else
1514 {
1515 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1516
1517 if (info->shared)
1518 {
1519 asection *s;
1520 Elf_Internal_Rela outrel;
1521 bfd_byte *loc;
1522
1523 s = bfd_get_section_by_name (dynobj, ".rela.got");
1524 BFD_ASSERT (s != NULL);
1525
1526 outrel.r_offset = (sgot->output_section->vma
1527 + sgot->output_offset
1528 + off);
1529 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1530 outrel.r_addend = relocation;
1531 loc = s->contents;
1532 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1533 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1534 }
1535
1536 local_got_offsets[r_symndx] |= 1;
1537 }
1538 }
1539
1540 relocation = sgot->output_offset + off;
1541 if (r_type == R_68K_GOT8O
1542 || r_type == R_68K_GOT16O
1543 || r_type == R_68K_GOT32O)
1544 {
1545 /* This relocation does not use the addend. */
1546 rel->r_addend = 0;
1547 }
1548 else
1549 relocation += sgot->output_section->vma;
1550 }
1551 break;
1552
1553 case R_68K_PLT8:
1554 case R_68K_PLT16:
1555 case R_68K_PLT32:
1556 /* Relocation is to the entry for this symbol in the
1557 procedure linkage table. */
1558
1559 /* Resolve a PLTxx reloc against a local symbol directly,
1560 without using the procedure linkage table. */
1561 if (h == NULL)
1562 break;
1563
1564 if (h->plt.offset == (bfd_vma) -1
1565 || !elf_hash_table (info)->dynamic_sections_created)
1566 {
1567 /* We didn't make a PLT entry for this symbol. This
1568 happens when statically linking PIC code, or when
1569 using -Bsymbolic. */
1570 break;
1571 }
1572
1573 if (splt == NULL)
1574 {
1575 splt = bfd_get_section_by_name (dynobj, ".plt");
1576 BFD_ASSERT (splt != NULL);
1577 }
1578
1579 relocation = (splt->output_section->vma
1580 + splt->output_offset
1581 + h->plt.offset);
1582 unresolved_reloc = FALSE;
1583 break;
1584
1585 case R_68K_PLT8O:
1586 case R_68K_PLT16O:
1587 case R_68K_PLT32O:
1588 /* Relocation is the offset of the entry for this symbol in
1589 the procedure linkage table. */
1590 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1591
1592 if (splt == NULL)
1593 {
1594 splt = bfd_get_section_by_name (dynobj, ".plt");
1595 BFD_ASSERT (splt != NULL);
1596 }
1597
1598 relocation = h->plt.offset;
1599 unresolved_reloc = FALSE;
1600
1601 /* This relocation does not use the addend. */
1602 rel->r_addend = 0;
1603
1604 break;
1605
1606 case R_68K_PC8:
1607 case R_68K_PC16:
1608 case R_68K_PC32:
1609 if (h == NULL
1610 || (info->shared
1611 && h->forced_local))
1612 break;
1613 /* Fall through. */
1614 case R_68K_8:
1615 case R_68K_16:
1616 case R_68K_32:
1617 if (info->shared
1618 && r_symndx != 0
1619 && (input_section->flags & SEC_ALLOC) != 0
1620 && (h == NULL
1621 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1622 || h->root.type != bfd_link_hash_undefweak)
1623 && ((r_type != R_68K_PC8
1624 && r_type != R_68K_PC16
1625 && r_type != R_68K_PC32)
1626 || (h != NULL
1627 && h->dynindx != -1
1628 && (!info->symbolic
1629 || !h->def_regular))))
1630 {
1631 Elf_Internal_Rela outrel;
1632 bfd_byte *loc;
1633 bfd_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 skip = FALSE;
1640 relocate = FALSE;
1641
1642 outrel.r_offset =
1643 _bfd_elf_section_offset (output_bfd, info, input_section,
1644 rel->r_offset);
1645 if (outrel.r_offset == (bfd_vma) -1)
1646 skip = TRUE;
1647 else if (outrel.r_offset == (bfd_vma) -2)
1648 skip = TRUE, relocate = TRUE;
1649 outrel.r_offset += (input_section->output_section->vma
1650 + input_section->output_offset);
1651
1652 if (skip)
1653 memset (&outrel, 0, sizeof outrel);
1654 else if (h != NULL
1655 && h->dynindx != -1
1656 && (r_type == R_68K_PC8
1657 || r_type == R_68K_PC16
1658 || r_type == R_68K_PC32
1659 || !info->shared
1660 || !info->symbolic
1661 || !h->def_regular))
1662 {
1663 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1664 outrel.r_addend = rel->r_addend;
1665 }
1666 else
1667 {
1668 /* This symbol is local, or marked to become local. */
1669 if (r_type == R_68K_32)
1670 {
1671 relocate = TRUE;
1672 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1673 outrel.r_addend = relocation + rel->r_addend;
1674 }
1675 else
1676 {
1677 long indx;
1678
1679 if (bfd_is_abs_section (sec))
1680 indx = 0;
1681 else if (sec == NULL || sec->owner == NULL)
1682 {
1683 bfd_set_error (bfd_error_bad_value);
1684 return FALSE;
1685 }
1686 else
1687 {
1688 asection *osec;
1689
1690 osec = sec->output_section;
1691 indx = elf_section_data (osec)->dynindx;
1692 BFD_ASSERT (indx > 0);
1693 }
1694
1695 outrel.r_info = ELF32_R_INFO (indx, r_type);
1696 outrel.r_addend = relocation + rel->r_addend;
1697 }
1698 }
1699
1700 sreloc = elf_section_data (input_section)->sreloc;
1701 if (sreloc == NULL)
1702 abort ();
1703
1704 loc = sreloc->contents;
1705 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1706 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1707
1708 /* This reloc will be computed at runtime, so there's no
1709 need to do anything now, except for R_68K_32
1710 relocations that have been turned into
1711 R_68K_RELATIVE. */
1712 if (!relocate)
1713 continue;
1714 }
1715
1716 break;
1717
1718 case R_68K_GNU_VTINHERIT:
1719 case R_68K_GNU_VTENTRY:
1720 /* These are no-ops in the end. */
1721 continue;
1722
1723 default:
1724 break;
1725 }
1726
1727 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1728 because such sections are not SEC_ALLOC and thus ld.so will
1729 not process them. */
1730 if (unresolved_reloc
1731 && !((input_section->flags & SEC_DEBUGGING) != 0
1732 && h->def_dynamic))
1733 {
1734 (*_bfd_error_handler)
1735 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
1736 input_bfd,
1737 input_section,
1738 (long) rel->r_offset,
1739 h->root.root.string);
1740 return FALSE;
1741 }
1742
1743 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1744 contents, rel->r_offset,
1745 relocation, rel->r_addend);
1746
1747 if (r != bfd_reloc_ok)
1748 {
1749 const char *name;
1750
1751 if (h != NULL)
1752 name = h->root.root.string;
1753 else
1754 {
1755 name = bfd_elf_string_from_elf_section (input_bfd,
1756 symtab_hdr->sh_link,
1757 sym->st_name);
1758 if (name == NULL)
1759 return FALSE;
1760 if (*name == '\0')
1761 name = bfd_section_name (input_bfd, sec);
1762 }
1763
1764 if (r == bfd_reloc_overflow)
1765 {
1766 if (!(info->callbacks->reloc_overflow
1767 (info, (h ? &h->root : NULL), name, howto->name,
1768 (bfd_vma) 0, input_bfd, input_section,
1769 rel->r_offset)))
1770 return FALSE;
1771 }
1772 else
1773 {
1774 (*_bfd_error_handler)
1775 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
1776 input_bfd, input_section,
1777 (long) rel->r_offset, name, (int) r);
1778 return FALSE;
1779 }
1780 }
1781 }
1782
1783 return TRUE;
1784 }
1785
1786 /* Finish up dynamic symbol handling. We set the contents of various
1787 dynamic sections here. */
1788
1789 static bfd_boolean
1790 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1791 bfd *output_bfd;
1792 struct bfd_link_info *info;
1793 struct elf_link_hash_entry *h;
1794 Elf_Internal_Sym *sym;
1795 {
1796 bfd *dynobj;
1797 int plt_off1, plt_off2, plt_off3;
1798
1799 dynobj = elf_hash_table (info)->dynobj;
1800
1801 if (h->plt.offset != (bfd_vma) -1)
1802 {
1803 asection *splt;
1804 asection *sgot;
1805 asection *srela;
1806 bfd_vma plt_index;
1807 bfd_vma got_offset;
1808 Elf_Internal_Rela rela;
1809 bfd_byte *loc;
1810
1811 /* This symbol has an entry in the procedure linkage table. Set
1812 it up. */
1813
1814 BFD_ASSERT (h->dynindx != -1);
1815
1816 splt = bfd_get_section_by_name (dynobj, ".plt");
1817 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1818 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1819 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1820
1821 /* Get the index in the procedure linkage table which
1822 corresponds to this symbol. This is the index of this symbol
1823 in all the symbols for which we are making plt entries. The
1824 first entry in the procedure linkage table is reserved. */
1825 if (CPU32_FLAG (output_bfd))
1826 plt_index = (h->plt.offset / PLT_CPU32_ENTRY_SIZE) - 1;
1827 else if (CFV4E_FLAG (output_bfd))
1828 plt_index = (h->plt.offset / CFV4E_PLT_ENTRY_SIZE) - 1;
1829 else
1830 plt_index = (h->plt.offset / PLT_ENTRY_SIZE) - 1;
1831
1832 /* Get the offset into the .got table of the entry that
1833 corresponds to this function. Each .got entry is 4 bytes.
1834 The first three are reserved. */
1835 got_offset = (plt_index + 3) * 4;
1836
1837 if (CPU32_FLAG (output_bfd))
1838 {
1839 /* Fill in the entry in the procedure linkage table. */
1840 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1841 PLT_CPU32_ENTRY_SIZE);
1842 plt_off1 = 4;
1843 plt_off2 = 12;
1844 plt_off3 = 18;
1845 }
1846 else if (CFV4E_FLAG (output_bfd))
1847 {
1848 memcpy (splt->contents + h->plt.offset, elf_cfv4e_plt_entry,
1849 CFV4E_PLT_ENTRY_SIZE);
1850 plt_off1 = 2;
1851 plt_off2 = 14;
1852 plt_off3 = 20;
1853 }
1854 else
1855 {
1856 /* Fill in the entry in the procedure linkage table. */
1857 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1858 PLT_ENTRY_SIZE);
1859 plt_off1 = 4;
1860 plt_off2 = 10;
1861 plt_off3 = 16;
1862 }
1863
1864 /* The offset is relative to the first extension word. */
1865 bfd_put_32 (output_bfd,
1866 sgot->output_section->vma
1867 + sgot->output_offset
1868 + got_offset
1869 - (splt->output_section->vma
1870 + h->plt.offset
1871 + CFV4E_FLAG (output_bfd) ? 8 : 2),
1872 splt->contents + h->plt.offset + plt_off1);
1873
1874 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1875 splt->contents + h->plt.offset + plt_off2);
1876 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1877 splt->contents + h->plt.offset + plt_off3);
1878
1879 /* Fill in the entry in the global offset table. */
1880 bfd_put_32 (output_bfd,
1881 (splt->output_section->vma
1882 + splt->output_offset
1883 + h->plt.offset
1884 + CFV4E_FLAG (output_bfd) ? 12 : 8),
1885 sgot->contents + got_offset);
1886
1887 /* Fill in the entry in the .rela.plt section. */
1888 rela.r_offset = (sgot->output_section->vma
1889 + sgot->output_offset
1890 + got_offset);
1891 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1892 rela.r_addend = 0;
1893 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1894 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1895
1896 if (!h->def_regular)
1897 {
1898 /* Mark the symbol as undefined, rather than as defined in
1899 the .plt section. Leave the value alone. */
1900 sym->st_shndx = SHN_UNDEF;
1901 }
1902 }
1903
1904 if (h->got.offset != (bfd_vma) -1)
1905 {
1906 asection *sgot;
1907 asection *srela;
1908 Elf_Internal_Rela rela;
1909 bfd_byte *loc;
1910
1911 /* This symbol has an entry in the global offset table. Set it
1912 up. */
1913
1914 sgot = bfd_get_section_by_name (dynobj, ".got");
1915 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1916 BFD_ASSERT (sgot != NULL && srela != NULL);
1917
1918 rela.r_offset = (sgot->output_section->vma
1919 + sgot->output_offset
1920 + (h->got.offset &~ (bfd_vma) 1));
1921
1922 /* If this is a -Bsymbolic link, and the symbol is defined
1923 locally, we just want to emit a RELATIVE reloc. Likewise if
1924 the symbol was forced to be local because of a version file.
1925 The entry in the global offset table will already have been
1926 initialized in the relocate_section function. */
1927 if (info->shared
1928 && (info->symbolic
1929 || h->dynindx == -1
1930 || h->forced_local)
1931 && h->def_regular)
1932 {
1933 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1934 rela.r_addend = bfd_get_signed_32 (output_bfd,
1935 (sgot->contents
1936 + (h->got.offset &~ (bfd_vma) 1)));
1937 }
1938 else
1939 {
1940 bfd_put_32 (output_bfd, (bfd_vma) 0,
1941 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1942 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1943 rela.r_addend = 0;
1944 }
1945
1946 loc = srela->contents;
1947 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1948 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1949 }
1950
1951 if (h->needs_copy)
1952 {
1953 asection *s;
1954 Elf_Internal_Rela rela;
1955 bfd_byte *loc;
1956
1957 /* This symbol needs a copy reloc. Set it up. */
1958
1959 BFD_ASSERT (h->dynindx != -1
1960 && (h->root.type == bfd_link_hash_defined
1961 || h->root.type == bfd_link_hash_defweak));
1962
1963 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1964 ".rela.bss");
1965 BFD_ASSERT (s != NULL);
1966
1967 rela.r_offset = (h->root.u.def.value
1968 + h->root.u.def.section->output_section->vma
1969 + h->root.u.def.section->output_offset);
1970 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1971 rela.r_addend = 0;
1972 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1973 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1974 }
1975
1976 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1977 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1978 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1979 sym->st_shndx = SHN_ABS;
1980
1981 return TRUE;
1982 }
1983
1984 /* Finish up the dynamic sections. */
1985
1986 static bfd_boolean
1987 elf_m68k_finish_dynamic_sections (output_bfd, info)
1988 bfd *output_bfd;
1989 struct bfd_link_info *info;
1990 {
1991 bfd *dynobj;
1992 asection *sgot;
1993 asection *sdyn;
1994
1995 dynobj = elf_hash_table (info)->dynobj;
1996
1997 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1998 BFD_ASSERT (sgot != NULL);
1999 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2000
2001 if (elf_hash_table (info)->dynamic_sections_created)
2002 {
2003 asection *splt;
2004 Elf32_External_Dyn *dyncon, *dynconend;
2005
2006 splt = bfd_get_section_by_name (dynobj, ".plt");
2007 BFD_ASSERT (splt != NULL && sdyn != NULL);
2008
2009 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2010 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2011 for (; dyncon < dynconend; dyncon++)
2012 {
2013 Elf_Internal_Dyn dyn;
2014 const char *name;
2015 asection *s;
2016
2017 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2018
2019 switch (dyn.d_tag)
2020 {
2021 default:
2022 break;
2023
2024 case DT_PLTGOT:
2025 name = ".got";
2026 goto get_vma;
2027 case DT_JMPREL:
2028 name = ".rela.plt";
2029 get_vma:
2030 s = bfd_get_section_by_name (output_bfd, name);
2031 BFD_ASSERT (s != NULL);
2032 dyn.d_un.d_ptr = s->vma;
2033 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2034 break;
2035
2036 case DT_PLTRELSZ:
2037 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2038 BFD_ASSERT (s != NULL);
2039 dyn.d_un.d_val = s->size;
2040 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2041 break;
2042
2043 case DT_RELASZ:
2044 /* The procedure linkage table relocs (DT_JMPREL) should
2045 not be included in the overall relocs (DT_RELA).
2046 Therefore, we override the DT_RELASZ entry here to
2047 make it not include the JMPREL relocs. Since the
2048 linker script arranges for .rela.plt to follow all
2049 other relocation sections, we don't have to worry
2050 about changing the DT_RELA entry. */
2051 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2052 if (s != NULL)
2053 dyn.d_un.d_val -= s->size;
2054 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2055 break;
2056 }
2057 }
2058
2059 /* Fill in the first entry in the procedure linkage table. */
2060 if (splt->size > 0)
2061 {
2062 if (CFV4E_FLAG (output_bfd))
2063 {
2064 memcpy (splt->contents, elf_cfv4e_plt0_entry, CFV4E_PLT_ENTRY_SIZE);
2065 bfd_put_32 (output_bfd,
2066 (sgot->output_section->vma
2067 + sgot->output_offset + 4
2068 - (splt->output_section->vma + 2)),
2069 splt->contents + 2);
2070 bfd_put_32 (output_bfd,
2071 (sgot->output_section->vma
2072 + sgot->output_offset + 8
2073 - (splt->output_section->vma + 10) - 8),
2074 splt->contents + 12);
2075 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2076 = CFV4E_PLT_ENTRY_SIZE;
2077 }
2078 else if (CPU32_FLAG (output_bfd))
2079 {
2080 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2081 bfd_put_32 (output_bfd,
2082 (sgot->output_section->vma
2083 + sgot->output_offset + 4
2084 - (splt->output_section->vma + 2)),
2085 splt->contents + 4);
2086 bfd_put_32 (output_bfd,
2087 (sgot->output_section->vma
2088 + sgot->output_offset + 8
2089 - (splt->output_section->vma + 10)),
2090 splt->contents + 12);
2091 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2092 = PLT_CPU32_ENTRY_SIZE;
2093 }
2094 else
2095 {
2096 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2097 bfd_put_32 (output_bfd,
2098 (sgot->output_section->vma
2099 + sgot->output_offset + 4
2100 - (splt->output_section->vma + 2)),
2101 splt->contents + 4);
2102 bfd_put_32 (output_bfd,
2103 (sgot->output_section->vma
2104 + sgot->output_offset + 8
2105 - (splt->output_section->vma + 10)),
2106 splt->contents + 12);
2107 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2108 = PLT_ENTRY_SIZE;
2109 }
2110 }
2111 }
2112
2113 /* Fill in the first three entries in the global offset table. */
2114 if (sgot->size > 0)
2115 {
2116 if (sdyn == NULL)
2117 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2118 else
2119 bfd_put_32 (output_bfd,
2120 sdyn->output_section->vma + sdyn->output_offset,
2121 sgot->contents);
2122 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2123 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2124 }
2125
2126 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2127
2128 return TRUE;
2129 }
2130
2131 /* Given a .data section and a .emreloc in-memory section, store
2132 relocation information into the .emreloc section which can be
2133 used at runtime to relocate the section. This is called by the
2134 linker when the --embedded-relocs switch is used. This is called
2135 after the add_symbols entry point has been called for all the
2136 objects, and before the final_link entry point is called. */
2137
2138 bfd_boolean
2139 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2140 bfd *abfd;
2141 struct bfd_link_info *info;
2142 asection *datasec;
2143 asection *relsec;
2144 char **errmsg;
2145 {
2146 Elf_Internal_Shdr *symtab_hdr;
2147 Elf_Internal_Sym *isymbuf = NULL;
2148 Elf_Internal_Rela *internal_relocs = NULL;
2149 Elf_Internal_Rela *irel, *irelend;
2150 bfd_byte *p;
2151 bfd_size_type amt;
2152
2153 BFD_ASSERT (! info->relocatable);
2154
2155 *errmsg = NULL;
2156
2157 if (datasec->reloc_count == 0)
2158 return TRUE;
2159
2160 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2161
2162 /* Get a copy of the native relocations. */
2163 internal_relocs = (_bfd_elf_link_read_relocs
2164 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2165 info->keep_memory));
2166 if (internal_relocs == NULL)
2167 goto error_return;
2168
2169 amt = (bfd_size_type) datasec->reloc_count * 12;
2170 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2171 if (relsec->contents == NULL)
2172 goto error_return;
2173
2174 p = relsec->contents;
2175
2176 irelend = internal_relocs + datasec->reloc_count;
2177 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2178 {
2179 asection *targetsec;
2180
2181 /* We are going to write a four byte longword into the runtime
2182 reloc section. The longword will be the address in the data
2183 section which must be relocated. It is followed by the name
2184 of the target section NUL-padded or truncated to 8
2185 characters. */
2186
2187 /* We can only relocate absolute longword relocs at run time. */
2188 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2189 {
2190 *errmsg = _("unsupported reloc type");
2191 bfd_set_error (bfd_error_bad_value);
2192 goto error_return;
2193 }
2194
2195 /* Get the target section referred to by the reloc. */
2196 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2197 {
2198 /* A local symbol. */
2199 Elf_Internal_Sym *isym;
2200
2201 /* Read this BFD's local symbols if we haven't done so already. */
2202 if (isymbuf == NULL)
2203 {
2204 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2205 if (isymbuf == NULL)
2206 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2207 symtab_hdr->sh_info, 0,
2208 NULL, NULL, NULL);
2209 if (isymbuf == NULL)
2210 goto error_return;
2211 }
2212
2213 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2214 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2215 }
2216 else
2217 {
2218 unsigned long indx;
2219 struct elf_link_hash_entry *h;
2220
2221 /* An external symbol. */
2222 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2223 h = elf_sym_hashes (abfd)[indx];
2224 BFD_ASSERT (h != NULL);
2225 if (h->root.type == bfd_link_hash_defined
2226 || h->root.type == bfd_link_hash_defweak)
2227 targetsec = h->root.u.def.section;
2228 else
2229 targetsec = NULL;
2230 }
2231
2232 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2233 memset (p + 4, 0, 8);
2234 if (targetsec != NULL)
2235 strncpy ((char *) p + 4, targetsec->output_section->name, 8);
2236 }
2237
2238 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2239 free (isymbuf);
2240 if (internal_relocs != NULL
2241 && elf_section_data (datasec)->relocs != internal_relocs)
2242 free (internal_relocs);
2243 return TRUE;
2244
2245 error_return:
2246 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2247 free (isymbuf);
2248 if (internal_relocs != NULL
2249 && elf_section_data (datasec)->relocs != internal_relocs)
2250 free (internal_relocs);
2251 return FALSE;
2252 }
2253
2254 static enum elf_reloc_type_class
2255 elf32_m68k_reloc_type_class (rela)
2256 const Elf_Internal_Rela *rela;
2257 {
2258 switch ((int) ELF32_R_TYPE (rela->r_info))
2259 {
2260 case R_68K_RELATIVE:
2261 return reloc_class_relative;
2262 case R_68K_JMP_SLOT:
2263 return reloc_class_plt;
2264 case R_68K_COPY:
2265 return reloc_class_copy;
2266 default:
2267 return reloc_class_normal;
2268 }
2269 }
2270
2271 /* Return address for Ith PLT stub in section PLT, for relocation REL
2272 or (bfd_vma) -1 if it should not be included. */
2273
2274 static bfd_vma
2275 elf_m68k_plt_sym_val (bfd_vma i, const asection *plt,
2276 const arelent *rel ATTRIBUTE_UNUSED)
2277 {
2278 if (CPU32_FLAG (plt->owner))
2279 return plt->vma + (i + 1) * PLT_CPU32_ENTRY_SIZE;
2280 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
2281 }
2282
2283 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2284 #define TARGET_BIG_NAME "elf32-m68k"
2285 #define ELF_MACHINE_CODE EM_68K
2286 #define ELF_MAXPAGESIZE 0x2000
2287 #define elf_backend_create_dynamic_sections \
2288 _bfd_elf_create_dynamic_sections
2289 #define bfd_elf32_bfd_link_hash_table_create \
2290 elf_m68k_link_hash_table_create
2291 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
2292
2293 #define elf_backend_check_relocs elf_m68k_check_relocs
2294 #define elf_backend_adjust_dynamic_symbol \
2295 elf_m68k_adjust_dynamic_symbol
2296 #define elf_backend_size_dynamic_sections \
2297 elf_m68k_size_dynamic_sections
2298 #define elf_backend_relocate_section elf_m68k_relocate_section
2299 #define elf_backend_finish_dynamic_symbol \
2300 elf_m68k_finish_dynamic_symbol
2301 #define elf_backend_finish_dynamic_sections \
2302 elf_m68k_finish_dynamic_sections
2303 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2304 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2305 #define bfd_elf32_bfd_merge_private_bfd_data \
2306 elf32_m68k_merge_private_bfd_data
2307 #define bfd_elf32_bfd_set_private_flags \
2308 elf32_m68k_set_private_flags
2309 #define bfd_elf32_bfd_print_private_bfd_data \
2310 elf32_m68k_print_private_bfd_data
2311 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2312 #define elf_backend_plt_sym_val elf_m68k_plt_sym_val
2313
2314 #define elf_backend_can_gc_sections 1
2315 #define elf_backend_can_refcount 1
2316 #define elf_backend_want_got_plt 1
2317 #define elf_backend_plt_readonly 1
2318 #define elf_backend_want_plt_sym 0
2319 #define elf_backend_got_header_size 12
2320 #define elf_backend_rela_normal 1
2321
2322 #include "elf32-target.h"
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