1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 2004 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
rtype_to_howto(abfd,cache_ptr,dst)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 *
reloc_type_lookup(abfd,code)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
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 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
221
222 #define PLT_CPU32_ENTRY_SIZE 24
223 /* Procedure linkage table entries for the cpu32 */
224 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
225 {
226 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
227 0, 0, 0, 0, /* replaced with offset to .got + 4. */
228 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
229 0, 0, 0, 0, /* replace with offset to .got +8. */
230 0x4e, 0xd1, /* jmp %a1@ */
231 0, 0, 0, 0, /* pad out to 24 bytes. */
232 0, 0
233 };
234
235 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
236 {
237 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
238 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
239 0x4e, 0xd1, /* jmp %a1@ */
240 0x2f, 0x3c, /* move.l #offset,-(%sp) */
241 0, 0, 0, 0, /* replaced with offset into relocation table. */
242 0x60, 0xff, /* bra.l .plt */
243 0, 0, 0, 0, /* replaced with offset to start of .plt. */
244 0, 0
245 };
246
247 /* The m68k linker needs to keep track of the number of relocs that it
248 decides to copy in check_relocs for each symbol. This is so that it
249 can discard PC relative relocs if it doesn't need them when linking
250 with -Bsymbolic. We store the information in a field extending the
251 regular ELF linker hash table. */
252
253 /* This structure keeps track of the number of PC relative relocs we have
254 copied for a given symbol. */
255
256 struct elf_m68k_pcrel_relocs_copied
257 {
258 /* Next section. */
259 struct elf_m68k_pcrel_relocs_copied *next;
260 /* A section in dynobj. */
261 asection *section;
262 /* Number of relocs copied in this section. */
263 bfd_size_type count;
264 };
265
266 /* m68k ELF linker hash entry. */
267
268 struct elf_m68k_link_hash_entry
269 {
270 struct elf_link_hash_entry root;
271
272 /* Number of PC relative relocs copied for this symbol. */
273 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
274 };
275
276 #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent))
277
278 /* m68k ELF linker hash table. */
279
280 struct elf_m68k_link_hash_table
281 {
282 struct elf_link_hash_table root;
283
284 /* Small local sym to section mapping cache. */
285 struct sym_sec_cache sym_sec;
286 };
287
288 /* Get the m68k ELF linker hash table from a link_info structure. */
289
290 #define elf_m68k_hash_table(p) \
291 ((struct elf_m68k_link_hash_table *) (p)->hash)
292
293 /* Create an entry in an m68k ELF linker hash table. */
294
295 static struct bfd_hash_entry *
elf_m68k_link_hash_newfunc(entry,table,string)296 elf_m68k_link_hash_newfunc (entry, table, string)
297 struct bfd_hash_entry *entry;
298 struct bfd_hash_table *table;
299 const char *string;
300 {
301 struct bfd_hash_entry *ret = entry;
302
303 /* Allocate the structure if it has not already been allocated by a
304 subclass. */
305 if (ret == NULL)
306 ret = bfd_hash_allocate (table,
307 sizeof (struct elf_m68k_link_hash_entry));
308 if (ret == NULL)
309 return ret;
310
311 /* Call the allocation method of the superclass. */
312 ret = _bfd_elf_link_hash_newfunc (ret, table, string);
313 if (ret != NULL)
314 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL;
315
316 return ret;
317 }
318
319 /* Create an m68k ELF linker hash table. */
320
321 static struct bfd_link_hash_table *
elf_m68k_link_hash_table_create(abfd)322 elf_m68k_link_hash_table_create (abfd)
323 bfd *abfd;
324 {
325 struct elf_m68k_link_hash_table *ret;
326 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table);
327
328 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt);
329 if (ret == (struct elf_m68k_link_hash_table *) NULL)
330 return NULL;
331
332 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
333 elf_m68k_link_hash_newfunc))
334 {
335 free (ret);
336 return NULL;
337 }
338
339 ret->sym_sec.abfd = NULL;
340
341 return &ret->root.root;
342 }
343
344 /* Keep m68k-specific flags in the ELF header. */
345 static bfd_boolean
elf32_m68k_set_private_flags(abfd,flags)346 elf32_m68k_set_private_flags (abfd, flags)
347 bfd *abfd;
348 flagword flags;
349 {
350 elf_elfheader (abfd)->e_flags = flags;
351 elf_flags_init (abfd) = TRUE;
352 return TRUE;
353 }
354
355 /* Merge backend specific data from an object file to the output
356 object file when linking. */
357 static bfd_boolean
elf32_m68k_merge_private_bfd_data(ibfd,obfd)358 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
359 bfd *ibfd;
360 bfd *obfd;
361 {
362 flagword out_flags;
363 flagword in_flags;
364
365 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
366 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
367 return TRUE;
368
369 in_flags = elf_elfheader (ibfd)->e_flags;
370 out_flags = elf_elfheader (obfd)->e_flags;
371
372 if (!elf_flags_init (obfd))
373 {
374 elf_flags_init (obfd) = TRUE;
375 elf_elfheader (obfd)->e_flags = in_flags;
376 }
377
378 return TRUE;
379 }
380
381 /* Display the flags field. */
382 static bfd_boolean
elf32_m68k_print_private_bfd_data(abfd,ptr)383 elf32_m68k_print_private_bfd_data (abfd, ptr)
384 bfd *abfd;
385 PTR ptr;
386 {
387 FILE *file = (FILE *) ptr;
388
389 BFD_ASSERT (abfd != NULL && ptr != NULL);
390
391 /* Print normal ELF private data. */
392 _bfd_elf_print_private_bfd_data (abfd, ptr);
393
394 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
395
396 /* xgettext:c-format */
397 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
398
399 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
400 fprintf (file, _(" [cpu32]"));
401
402 if (elf_elfheader (abfd)->e_flags & EF_M68000)
403 fprintf (file, _(" [m68000]"));
404
405 fputc ('\n', file);
406
407 return TRUE;
408 }
409 /* Look through the relocs for a section during the first phase, and
410 allocate space in the global offset table or procedure linkage
411 table. */
412
413 static bfd_boolean
elf_m68k_check_relocs(abfd,info,sec,relocs)414 elf_m68k_check_relocs (abfd, info, sec, relocs)
415 bfd *abfd;
416 struct bfd_link_info *info;
417 asection *sec;
418 const Elf_Internal_Rela *relocs;
419 {
420 bfd *dynobj;
421 Elf_Internal_Shdr *symtab_hdr;
422 struct elf_link_hash_entry **sym_hashes;
423 bfd_signed_vma *local_got_refcounts;
424 const Elf_Internal_Rela *rel;
425 const Elf_Internal_Rela *rel_end;
426 asection *sgot;
427 asection *srelgot;
428 asection *sreloc;
429
430 if (info->relocatable)
431 return TRUE;
432
433 dynobj = elf_hash_table (info)->dynobj;
434 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
435 sym_hashes = elf_sym_hashes (abfd);
436 local_got_refcounts = elf_local_got_refcounts (abfd);
437
438 sgot = NULL;
439 srelgot = NULL;
440 sreloc = NULL;
441
442 rel_end = relocs + sec->reloc_count;
443 for (rel = relocs; rel < rel_end; rel++)
444 {
445 unsigned long r_symndx;
446 struct elf_link_hash_entry *h;
447
448 r_symndx = ELF32_R_SYM (rel->r_info);
449
450 if (r_symndx < symtab_hdr->sh_info)
451 h = NULL;
452 else
453 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
454
455 switch (ELF32_R_TYPE (rel->r_info))
456 {
457 case R_68K_GOT8:
458 case R_68K_GOT16:
459 case R_68K_GOT32:
460 if (h != NULL
461 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
462 break;
463 /* Fall through. */
464 case R_68K_GOT8O:
465 case R_68K_GOT16O:
466 case R_68K_GOT32O:
467 /* This symbol requires a global offset table entry. */
468
469 if (dynobj == NULL)
470 {
471 /* Create the .got section. */
472 elf_hash_table (info)->dynobj = dynobj = abfd;
473 if (!_bfd_elf_create_got_section (dynobj, info))
474 return FALSE;
475 }
476
477 if (sgot == NULL)
478 {
479 sgot = bfd_get_section_by_name (dynobj, ".got");
480 BFD_ASSERT (sgot != NULL);
481 }
482
483 if (srelgot == NULL
484 && (h != NULL || info->shared))
485 {
486 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
487 if (srelgot == NULL)
488 {
489 srelgot = bfd_make_section (dynobj, ".rela.got");
490 if (srelgot == NULL
491 || !bfd_set_section_flags (dynobj, srelgot,
492 (SEC_ALLOC
493 | SEC_LOAD
494 | SEC_HAS_CONTENTS
495 | SEC_IN_MEMORY
496 | SEC_LINKER_CREATED
497 | SEC_READONLY))
498 || !bfd_set_section_alignment (dynobj, srelgot, 2))
499 return FALSE;
500 }
501 }
502
503 if (h != NULL)
504 {
505 if (h->got.refcount == 0)
506 {
507 /* Make sure this symbol is output as a dynamic symbol. */
508 if (h->dynindx == -1
509 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
510 {
511 if (!bfd_elf_link_record_dynamic_symbol (info, h))
512 return FALSE;
513 }
514
515 /* Allocate space in the .got section. */
516 sgot->_raw_size += 4;
517 /* Allocate relocation space. */
518 srelgot->_raw_size += sizeof (Elf32_External_Rela);
519 }
520 h->got.refcount++;
521 }
522 else
523 {
524 /* This is a global offset table entry for a local symbol. */
525 if (local_got_refcounts == NULL)
526 {
527 bfd_size_type size;
528
529 size = symtab_hdr->sh_info;
530 size *= sizeof (bfd_signed_vma);
531 local_got_refcounts = ((bfd_signed_vma *)
532 bfd_zalloc (abfd, size));
533 if (local_got_refcounts == NULL)
534 return FALSE;
535 elf_local_got_refcounts (abfd) = local_got_refcounts;
536 }
537 if (local_got_refcounts[r_symndx] == 0)
538 {
539 sgot->_raw_size += 4;
540 if (info->shared)
541 {
542 /* If we are generating a shared object, we need to
543 output a R_68K_RELATIVE reloc so that the dynamic
544 linker can adjust this GOT entry. */
545 srelgot->_raw_size += sizeof (Elf32_External_Rela);
546 }
547 }
548 local_got_refcounts[r_symndx]++;
549 }
550 break;
551
552 case R_68K_PLT8:
553 case R_68K_PLT16:
554 case R_68K_PLT32:
555 /* This symbol requires a procedure linkage table entry. We
556 actually build the entry in adjust_dynamic_symbol,
557 because this might be a case of linking PIC code which is
558 never referenced by a dynamic object, in which case we
559 don't need to generate a procedure linkage table entry
560 after all. */
561
562 /* If this is a local symbol, we resolve it directly without
563 creating a procedure linkage table entry. */
564 if (h == NULL)
565 continue;
566
567 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
568 h->plt.refcount++;
569 break;
570
571 case R_68K_PLT8O:
572 case R_68K_PLT16O:
573 case R_68K_PLT32O:
574 /* This symbol requires a procedure linkage table entry. */
575
576 if (h == NULL)
577 {
578 /* It does not make sense to have this relocation for a
579 local symbol. FIXME: does it? How to handle it if
580 it does make sense? */
581 bfd_set_error (bfd_error_bad_value);
582 return FALSE;
583 }
584
585 /* Make sure this symbol is output as a dynamic symbol. */
586 if (h->dynindx == -1
587 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
588 {
589 if (!bfd_elf_link_record_dynamic_symbol (info, h))
590 return FALSE;
591 }
592
593 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
594 h->plt.refcount++;
595 break;
596
597 case R_68K_PC8:
598 case R_68K_PC16:
599 case R_68K_PC32:
600 /* If we are creating a shared library and this is not a local
601 symbol, we need to copy the reloc into the shared library.
602 However when linking with -Bsymbolic and this is a global
603 symbol which is defined in an object we are including in the
604 link (i.e., DEF_REGULAR is set), then we can resolve the
605 reloc directly. At this point we have not seen all the input
606 files, so it is possible that DEF_REGULAR is not set now but
607 will be set later (it is never cleared). We account for that
608 possibility below by storing information in the
609 pcrel_relocs_copied field of the hash table entry. */
610 if (!(info->shared
611 && (sec->flags & SEC_ALLOC) != 0
612 && h != NULL
613 && (!info->symbolic
614 || h->root.type == bfd_link_hash_defweak
615 || (h->elf_link_hash_flags
616 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
617 {
618 if (h != NULL)
619 {
620 /* Make sure a plt entry is created for this symbol if
621 it turns out to be a function defined by a dynamic
622 object. */
623 h->plt.refcount++;
624 }
625 break;
626 }
627 /* Fall through. */
628 case R_68K_8:
629 case R_68K_16:
630 case R_68K_32:
631 if (h != NULL)
632 {
633 /* Make sure a plt entry is created for this symbol if it
634 turns out to be a function defined by a dynamic object. */
635 h->plt.refcount++;
636 }
637
638 /* If we are creating a shared library, we need to copy the
639 reloc into the shared library. */
640 if (info->shared
641 && (sec->flags & SEC_ALLOC) != 0)
642 {
643 /* When creating a shared object, we must copy these
644 reloc types into the output file. We create a reloc
645 section in dynobj and make room for this reloc. */
646 if (sreloc == NULL)
647 {
648 const char *name;
649
650 name = (bfd_elf_string_from_elf_section
651 (abfd,
652 elf_elfheader (abfd)->e_shstrndx,
653 elf_section_data (sec)->rel_hdr.sh_name));
654 if (name == NULL)
655 return FALSE;
656
657 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
658 && strcmp (bfd_get_section_name (abfd, sec),
659 name + 5) == 0);
660
661 sreloc = bfd_get_section_by_name (dynobj, name);
662 if (sreloc == NULL)
663 {
664 sreloc = bfd_make_section (dynobj, name);
665 if (sreloc == NULL
666 || !bfd_set_section_flags (dynobj, sreloc,
667 (SEC_ALLOC
668 | SEC_LOAD
669 | SEC_HAS_CONTENTS
670 | SEC_IN_MEMORY
671 | SEC_LINKER_CREATED
672 | SEC_READONLY))
673 || !bfd_set_section_alignment (dynobj, sreloc, 2))
674 return FALSE;
675 }
676 elf_section_data (sec)->sreloc = sreloc;
677 }
678
679 if (sec->flags & SEC_READONLY
680 /* Don't set DF_TEXTREL yet for PC relative
681 relocations, they might be discarded later. */
682 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8
683 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
684 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32))
685 info->flags |= DF_TEXTREL;
686
687 sreloc->_raw_size += sizeof (Elf32_External_Rela);
688
689 /* We count the number of PC relative relocations we have
690 entered for this symbol, so that we can discard them
691 again if, in the -Bsymbolic case, the symbol is later
692 defined by a regular object, or, in the normal shared
693 case, the symbol is forced to be local. Note that this
694 function is only called if we are using an m68kelf linker
695 hash table, which means that h is really a pointer to an
696 elf_m68k_link_hash_entry. */
697 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8
698 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
699 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
700 {
701 struct elf_m68k_pcrel_relocs_copied *p;
702 struct elf_m68k_pcrel_relocs_copied **head;
703
704 if (h != NULL)
705 {
706 struct elf_m68k_link_hash_entry *eh
707 = elf_m68k_hash_entry (h);
708 head = &eh->pcrel_relocs_copied;
709 }
710 else
711 {
712 asection *s;
713 s = (bfd_section_from_r_symndx
714 (abfd, &elf_m68k_hash_table (info)->sym_sec,
715 sec, r_symndx));
716 if (s == NULL)
717 return FALSE;
718
719 head = ((struct elf_m68k_pcrel_relocs_copied **)
720 &elf_section_data (s)->local_dynrel);
721 }
722
723 for (p = *head; p != NULL; p = p->next)
724 if (p->section == sreloc)
725 break;
726
727 if (p == NULL)
728 {
729 p = ((struct elf_m68k_pcrel_relocs_copied *)
730 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
731 if (p == NULL)
732 return FALSE;
733 p->next = *head;
734 *head = p;
735 p->section = sreloc;
736 p->count = 0;
737 }
738
739 ++p->count;
740 }
741 }
742
743 break;
744
745 /* This relocation describes the C++ object vtable hierarchy.
746 Reconstruct it for later use during GC. */
747 case R_68K_GNU_VTINHERIT:
748 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
749 return FALSE;
750 break;
751
752 /* This relocation describes which C++ vtable entries are actually
753 used. Record for later use during GC. */
754 case R_68K_GNU_VTENTRY:
755 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
756 return FALSE;
757 break;
758
759 default:
760 break;
761 }
762 }
763
764 return TRUE;
765 }
766
767 /* Return the section that should be marked against GC for a given
768 relocation. */
769
770 static asection *
elf_m68k_gc_mark_hook(sec,info,rel,h,sym)771 elf_m68k_gc_mark_hook (sec, info, rel, h, sym)
772 asection *sec;
773 struct bfd_link_info *info ATTRIBUTE_UNUSED;
774 Elf_Internal_Rela *rel;
775 struct elf_link_hash_entry *h;
776 Elf_Internal_Sym *sym;
777 {
778 if (h != NULL)
779 {
780 switch (ELF32_R_TYPE (rel->r_info))
781 {
782 case R_68K_GNU_VTINHERIT:
783 case R_68K_GNU_VTENTRY:
784 break;
785
786 default:
787 switch (h->root.type)
788 {
789 default:
790 break;
791
792 case bfd_link_hash_defined:
793 case bfd_link_hash_defweak:
794 return h->root.u.def.section;
795
796 case bfd_link_hash_common:
797 return h->root.u.c.p->section;
798 }
799 }
800 }
801 else
802 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
803
804 return NULL;
805 }
806
807 /* Update the got entry reference counts for the section being removed. */
808
809 static bfd_boolean
elf_m68k_gc_sweep_hook(abfd,info,sec,relocs)810 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
811 bfd *abfd;
812 struct bfd_link_info *info;
813 asection *sec;
814 const Elf_Internal_Rela *relocs;
815 {
816 Elf_Internal_Shdr *symtab_hdr;
817 struct elf_link_hash_entry **sym_hashes;
818 bfd_signed_vma *local_got_refcounts;
819 const Elf_Internal_Rela *rel, *relend;
820 bfd *dynobj;
821 asection *sgot;
822 asection *srelgot;
823
824 dynobj = elf_hash_table (info)->dynobj;
825 if (dynobj == NULL)
826 return TRUE;
827
828 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
829 sym_hashes = elf_sym_hashes (abfd);
830 local_got_refcounts = elf_local_got_refcounts (abfd);
831
832 sgot = bfd_get_section_by_name (dynobj, ".got");
833 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
834
835 relend = relocs + sec->reloc_count;
836 for (rel = relocs; rel < relend; rel++)
837 {
838 unsigned long r_symndx;
839 struct elf_link_hash_entry *h;
840
841 switch (ELF32_R_TYPE (rel->r_info))
842 {
843 case R_68K_GOT8:
844 case R_68K_GOT16:
845 case R_68K_GOT32:
846 case R_68K_GOT8O:
847 case R_68K_GOT16O:
848 case R_68K_GOT32O:
849 r_symndx = ELF32_R_SYM (rel->r_info);
850 if (r_symndx >= symtab_hdr->sh_info)
851 {
852 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
853 if (h->got.refcount > 0)
854 {
855 --h->got.refcount;
856 if (h->got.refcount == 0)
857 {
858 /* We don't need the .got entry any more. */
859 sgot->_raw_size -= 4;
860 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
861 }
862 }
863 }
864 else if (local_got_refcounts != NULL)
865 {
866 if (local_got_refcounts[r_symndx] > 0)
867 {
868 --local_got_refcounts[r_symndx];
869 if (local_got_refcounts[r_symndx] == 0)
870 {
871 /* We don't need the .got entry any more. */
872 sgot->_raw_size -= 4;
873 if (info->shared)
874 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
875 }
876 }
877 }
878 break;
879
880 case R_68K_PLT8:
881 case R_68K_PLT16:
882 case R_68K_PLT32:
883 case R_68K_PLT8O:
884 case R_68K_PLT16O:
885 case R_68K_PLT32O:
886 case R_68K_PC8:
887 case R_68K_PC16:
888 case R_68K_PC32:
889 case R_68K_8:
890 case R_68K_16:
891 case R_68K_32:
892 r_symndx = ELF32_R_SYM (rel->r_info);
893 if (r_symndx >= symtab_hdr->sh_info)
894 {
895 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
896 if (h->plt.refcount > 0)
897 --h->plt.refcount;
898 }
899 break;
900
901 default:
902 break;
903 }
904 }
905
906 return TRUE;
907 }
908
909 /* Adjust a symbol defined by a dynamic object and referenced by a
910 regular object. The current definition is in some section of the
911 dynamic object, but we're not including those sections. We have to
912 change the definition to something the rest of the link can
913 understand. */
914
915 static bfd_boolean
elf_m68k_adjust_dynamic_symbol(info,h)916 elf_m68k_adjust_dynamic_symbol (info, h)
917 struct bfd_link_info *info;
918 struct elf_link_hash_entry *h;
919 {
920 bfd *dynobj;
921 asection *s;
922 unsigned int power_of_two;
923
924 dynobj = elf_hash_table (info)->dynobj;
925
926 /* Make sure we know what is going on here. */
927 BFD_ASSERT (dynobj != NULL
928 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
929 || h->weakdef != NULL
930 || ((h->elf_link_hash_flags
931 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
932 && (h->elf_link_hash_flags
933 & ELF_LINK_HASH_REF_REGULAR) != 0
934 && (h->elf_link_hash_flags
935 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
936
937 /* If this is a function, put it in the procedure linkage table. We
938 will fill in the contents of the procedure linkage table later,
939 when we know the address of the .got section. */
940 if (h->type == STT_FUNC
941 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
942 {
943 if (! info->shared
944 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
945 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
946 /* We must always create the plt entry if it was referenced
947 by a PLTxxO relocation. In this case we already recorded
948 it as a dynamic symbol. */
949 && h->dynindx == -1)
950 {
951 /* This case can occur if we saw a PLTxx reloc in an input
952 file, but the symbol was never referred to by a dynamic
953 object. In such a case, we don't actually need to build
954 a procedure linkage table, and we can just do a PCxx
955 reloc instead. */
956 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
957 h->plt.offset = (bfd_vma) -1;
958 return TRUE;
959 }
960
961 /* GC may have rendered this entry unused. */
962 if (h->plt.refcount <= 0)
963 {
964 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
965 h->plt.offset = (bfd_vma) -1;
966 return TRUE;
967 }
968
969 /* Make sure this symbol is output as a dynamic symbol. */
970 if (h->dynindx == -1
971 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
972 {
973 if (! bfd_elf_link_record_dynamic_symbol (info, h))
974 return FALSE;
975 }
976
977 s = bfd_get_section_by_name (dynobj, ".plt");
978 BFD_ASSERT (s != NULL);
979
980 /* If this is the first .plt entry, make room for the special
981 first entry. */
982 if (s->_raw_size == 0)
983 {
984 if (CPU32_FLAG (dynobj))
985 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
986 else
987 s->_raw_size += PLT_ENTRY_SIZE;
988 }
989
990 /* If this symbol is not defined in a regular file, and we are
991 not generating a shared library, then set the symbol to this
992 location in the .plt. This is required to make function
993 pointers compare as equal between the normal executable and
994 the shared library. */
995 if (!info->shared
996 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
997 {
998 h->root.u.def.section = s;
999 h->root.u.def.value = s->_raw_size;
1000 }
1001
1002 h->plt.offset = s->_raw_size;
1003
1004 /* Make room for this entry. */
1005 if (CPU32_FLAG (dynobj))
1006 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1007 else
1008 s->_raw_size += PLT_ENTRY_SIZE;
1009
1010 /* We also need to make an entry in the .got.plt section, which
1011 will be placed in the .got section by the linker script. */
1012 s = bfd_get_section_by_name (dynobj, ".got.plt");
1013 BFD_ASSERT (s != NULL);
1014 s->_raw_size += 4;
1015
1016 /* We also need to make an entry in the .rela.plt section. */
1017 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1018 BFD_ASSERT (s != NULL);
1019 s->_raw_size += sizeof (Elf32_External_Rela);
1020
1021 return TRUE;
1022 }
1023
1024 /* Reinitialize the plt offset now that it is not used as a reference
1025 count any more. */
1026 h->plt.offset = (bfd_vma) -1;
1027
1028 /* If this is a weak symbol, and there is a real definition, the
1029 processor independent code will have arranged for us to see the
1030 real definition first, and we can just use the same value. */
1031 if (h->weakdef != NULL)
1032 {
1033 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1034 || h->weakdef->root.type == bfd_link_hash_defweak);
1035 h->root.u.def.section = h->weakdef->root.u.def.section;
1036 h->root.u.def.value = h->weakdef->root.u.def.value;
1037 return TRUE;
1038 }
1039
1040 /* This is a reference to a symbol defined by a dynamic object which
1041 is not a function. */
1042
1043 /* If we are creating a shared library, we must presume that the
1044 only references to the symbol are via the global offset table.
1045 For such cases we need not do anything here; the relocations will
1046 be handled correctly by relocate_section. */
1047 if (info->shared)
1048 return TRUE;
1049
1050 /* We must allocate the symbol in our .dynbss section, which will
1051 become part of the .bss section of the executable. There will be
1052 an entry for this symbol in the .dynsym section. The dynamic
1053 object will contain position independent code, so all references
1054 from the dynamic object to this symbol will go through the global
1055 offset table. The dynamic linker will use the .dynsym entry to
1056 determine the address it must put in the global offset table, so
1057 both the dynamic object and the regular object will refer to the
1058 same memory location for the variable. */
1059
1060 s = bfd_get_section_by_name (dynobj, ".dynbss");
1061 BFD_ASSERT (s != NULL);
1062
1063 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1064 copy the initial value out of the dynamic object and into the
1065 runtime process image. We need to remember the offset into the
1066 .rela.bss section we are going to use. */
1067 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1068 {
1069 asection *srel;
1070
1071 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1072 BFD_ASSERT (srel != NULL);
1073 srel->_raw_size += sizeof (Elf32_External_Rela);
1074 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1075 }
1076
1077 /* We need to figure out the alignment required for this symbol. I
1078 have no idea how ELF linkers handle this. */
1079 power_of_two = bfd_log2 (h->size);
1080 if (power_of_two > 3)
1081 power_of_two = 3;
1082
1083 /* Apply the required alignment. */
1084 s->_raw_size = BFD_ALIGN (s->_raw_size,
1085 (bfd_size_type) (1 << power_of_two));
1086 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1087 {
1088 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1089 return FALSE;
1090 }
1091
1092 /* Define the symbol as being at this point in the section. */
1093 h->root.u.def.section = s;
1094 h->root.u.def.value = s->_raw_size;
1095
1096 /* Increment the section size to make room for the symbol. */
1097 s->_raw_size += h->size;
1098
1099 return TRUE;
1100 }
1101
1102 /* Set the sizes of the dynamic sections. */
1103
1104 static bfd_boolean
elf_m68k_size_dynamic_sections(output_bfd,info)1105 elf_m68k_size_dynamic_sections (output_bfd, info)
1106 bfd *output_bfd ATTRIBUTE_UNUSED;
1107 struct bfd_link_info *info;
1108 {
1109 bfd *dynobj;
1110 asection *s;
1111 bfd_boolean plt;
1112 bfd_boolean relocs;
1113
1114 dynobj = elf_hash_table (info)->dynobj;
1115 BFD_ASSERT (dynobj != NULL);
1116
1117 if (elf_hash_table (info)->dynamic_sections_created)
1118 {
1119 /* Set the contents of the .interp section to the interpreter. */
1120 if (info->executable && !info->static_link)
1121 {
1122 s = bfd_get_section_by_name (dynobj, ".interp");
1123 BFD_ASSERT (s != NULL);
1124 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1125 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1126 }
1127 }
1128 else
1129 {
1130 /* We may have created entries in the .rela.got section.
1131 However, if we are not creating the dynamic sections, we will
1132 not actually use these entries. Reset the size of .rela.got,
1133 which will cause it to get stripped from the output file
1134 below. */
1135 s = bfd_get_section_by_name (dynobj, ".rela.got");
1136 if (s != NULL)
1137 s->_raw_size = 0;
1138 }
1139
1140 /* If this is a -Bsymbolic shared link, then we need to discard all
1141 PC relative relocs against symbols defined in a regular object.
1142 For the normal shared case we discard the PC relative relocs
1143 against symbols that have become local due to visibility changes.
1144 We allocated space for them in the check_relocs routine, but we
1145 will not fill them in in the relocate_section routine. */
1146 if (info->shared)
1147 elf_link_hash_traverse (elf_hash_table (info),
1148 elf_m68k_discard_copies,
1149 (PTR) info);
1150
1151 /* The check_relocs and adjust_dynamic_symbol entry points have
1152 determined the sizes of the various dynamic sections. Allocate
1153 memory for them. */
1154 plt = FALSE;
1155 relocs = FALSE;
1156 for (s = dynobj->sections; s != NULL; s = s->next)
1157 {
1158 const char *name;
1159 bfd_boolean strip;
1160
1161 if ((s->flags & SEC_LINKER_CREATED) == 0)
1162 continue;
1163
1164 /* It's OK to base decisions on the section name, because none
1165 of the dynobj section names depend upon the input files. */
1166 name = bfd_get_section_name (dynobj, s);
1167
1168 strip = FALSE;
1169
1170 if (strcmp (name, ".plt") == 0)
1171 {
1172 if (s->_raw_size == 0)
1173 {
1174 /* Strip this section if we don't need it; see the
1175 comment below. */
1176 strip = TRUE;
1177 }
1178 else
1179 {
1180 /* Remember whether there is a PLT. */
1181 plt = TRUE;
1182 }
1183 }
1184 else if (strncmp (name, ".rela", 5) == 0)
1185 {
1186 if (s->_raw_size == 0)
1187 {
1188 /* If we don't need this section, strip it from the
1189 output file. This is mostly to handle .rela.bss and
1190 .rela.plt. We must create both sections in
1191 create_dynamic_sections, because they must be created
1192 before the linker maps input sections to output
1193 sections. The linker does that before
1194 adjust_dynamic_symbol is called, and it is that
1195 function which decides whether anything needs to go
1196 into these sections. */
1197 strip = TRUE;
1198 }
1199 else
1200 {
1201 relocs = TRUE;
1202
1203 /* We use the reloc_count field as a counter if we need
1204 to copy relocs into the output file. */
1205 s->reloc_count = 0;
1206 }
1207 }
1208 else if (strncmp (name, ".got", 4) != 0)
1209 {
1210 /* It's not one of our sections, so don't allocate space. */
1211 continue;
1212 }
1213
1214 if (strip)
1215 {
1216 _bfd_strip_section_from_output (info, s);
1217 continue;
1218 }
1219
1220 /* Allocate memory for the section contents. */
1221 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1222 Unused entries should be reclaimed before the section's contents
1223 are written out, but at the moment this does not happen. Thus in
1224 order to prevent writing out garbage, we initialise the section's
1225 contents to zero. */
1226 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1227 if (s->contents == NULL && s->_raw_size != 0)
1228 return FALSE;
1229 }
1230
1231 if (elf_hash_table (info)->dynamic_sections_created)
1232 {
1233 /* Add some entries to the .dynamic section. We fill in the
1234 values later, in elf_m68k_finish_dynamic_sections, but we
1235 must add the entries now so that we get the correct size for
1236 the .dynamic section. The DT_DEBUG entry is filled in by the
1237 dynamic linker and used by the debugger. */
1238 #define add_dynamic_entry(TAG, VAL) \
1239 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1240
1241 if (!info->shared)
1242 {
1243 if (!add_dynamic_entry (DT_DEBUG, 0))
1244 return FALSE;
1245 }
1246
1247 if (plt)
1248 {
1249 if (!add_dynamic_entry (DT_PLTGOT, 0)
1250 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1251 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1252 || !add_dynamic_entry (DT_JMPREL, 0))
1253 return FALSE;
1254 }
1255
1256 if (relocs)
1257 {
1258 if (!add_dynamic_entry (DT_RELA, 0)
1259 || !add_dynamic_entry (DT_RELASZ, 0)
1260 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1261 return FALSE;
1262 }
1263
1264 if ((info->flags & DF_TEXTREL) != 0)
1265 {
1266 if (!add_dynamic_entry (DT_TEXTREL, 0))
1267 return FALSE;
1268 }
1269 }
1270 #undef add_dynamic_entry
1271
1272 return TRUE;
1273 }
1274
1275 /* This function is called via elf_link_hash_traverse if we are
1276 creating a shared object. In the -Bsymbolic case it discards the
1277 space allocated to copy PC relative relocs against symbols which
1278 are defined in regular objects. For the normal shared case, it
1279 discards space for pc-relative relocs that have become local due to
1280 symbol visibility changes. We allocated space for them in the
1281 check_relocs routine, but we won't fill them in in the
1282 relocate_section routine.
1283
1284 We also check whether any of the remaining relocations apply
1285 against a readonly section, and set the DF_TEXTREL flag in this
1286 case. */
1287
1288 static bfd_boolean
elf_m68k_discard_copies(h,inf)1289 elf_m68k_discard_copies (h, inf)
1290 struct elf_link_hash_entry *h;
1291 PTR inf;
1292 {
1293 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1294 struct elf_m68k_pcrel_relocs_copied *s;
1295
1296 if (h->root.type == bfd_link_hash_warning)
1297 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1298
1299 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
1300 || (!info->symbolic
1301 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0))
1302 {
1303 if ((info->flags & DF_TEXTREL) == 0)
1304 {
1305 /* Look for relocations against read-only sections. */
1306 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1307 s != NULL;
1308 s = s->next)
1309 if ((s->section->flags & SEC_READONLY) != 0)
1310 {
1311 info->flags |= DF_TEXTREL;
1312 break;
1313 }
1314 }
1315
1316 return TRUE;
1317 }
1318
1319 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1320 s != NULL;
1321 s = s->next)
1322 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1323
1324 return TRUE;
1325 }
1326
1327 /* Relocate an M68K ELF section. */
1328
1329 static bfd_boolean
elf_m68k_relocate_section(output_bfd,info,input_bfd,input_section,contents,relocs,local_syms,local_sections)1330 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1331 contents, relocs, local_syms, local_sections)
1332 bfd *output_bfd;
1333 struct bfd_link_info *info;
1334 bfd *input_bfd;
1335 asection *input_section;
1336 bfd_byte *contents;
1337 Elf_Internal_Rela *relocs;
1338 Elf_Internal_Sym *local_syms;
1339 asection **local_sections;
1340 {
1341 bfd *dynobj;
1342 Elf_Internal_Shdr *symtab_hdr;
1343 struct elf_link_hash_entry **sym_hashes;
1344 bfd_vma *local_got_offsets;
1345 asection *sgot;
1346 asection *splt;
1347 asection *sreloc;
1348 Elf_Internal_Rela *rel;
1349 Elf_Internal_Rela *relend;
1350
1351 if (info->relocatable)
1352 return TRUE;
1353
1354 dynobj = elf_hash_table (info)->dynobj;
1355 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1356 sym_hashes = elf_sym_hashes (input_bfd);
1357 local_got_offsets = elf_local_got_offsets (input_bfd);
1358
1359 sgot = NULL;
1360 splt = NULL;
1361 sreloc = NULL;
1362
1363 rel = relocs;
1364 relend = relocs + input_section->reloc_count;
1365 for (; rel < relend; rel++)
1366 {
1367 int r_type;
1368 reloc_howto_type *howto;
1369 unsigned long r_symndx;
1370 struct elf_link_hash_entry *h;
1371 Elf_Internal_Sym *sym;
1372 asection *sec;
1373 bfd_vma relocation;
1374 bfd_boolean unresolved_reloc;
1375 bfd_reloc_status_type r;
1376
1377 r_type = ELF32_R_TYPE (rel->r_info);
1378 if (r_type < 0 || r_type >= (int) R_68K_max)
1379 {
1380 bfd_set_error (bfd_error_bad_value);
1381 return FALSE;
1382 }
1383 howto = howto_table + r_type;
1384
1385 r_symndx = ELF32_R_SYM (rel->r_info);
1386
1387 h = NULL;
1388 sym = NULL;
1389 sec = NULL;
1390 unresolved_reloc = FALSE;
1391
1392 if (r_symndx < symtab_hdr->sh_info)
1393 {
1394 sym = local_syms + r_symndx;
1395 sec = local_sections[r_symndx];
1396 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1397 }
1398 else
1399 {
1400 bfd_boolean warned;
1401
1402 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1403 r_symndx, symtab_hdr, sym_hashes,
1404 h, sec, relocation,
1405 unresolved_reloc, warned);
1406 }
1407
1408 switch (r_type)
1409 {
1410 case R_68K_GOT8:
1411 case R_68K_GOT16:
1412 case R_68K_GOT32:
1413 /* Relocation is to the address of the entry for this symbol
1414 in the global offset table. */
1415 if (h != NULL
1416 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1417 break;
1418 /* Fall through. */
1419 case R_68K_GOT8O:
1420 case R_68K_GOT16O:
1421 case R_68K_GOT32O:
1422 /* Relocation is the offset of the entry for this symbol in
1423 the global offset table. */
1424
1425 {
1426 bfd_vma off;
1427
1428 if (sgot == NULL)
1429 {
1430 sgot = bfd_get_section_by_name (dynobj, ".got");
1431 BFD_ASSERT (sgot != NULL);
1432 }
1433
1434 if (h != NULL)
1435 {
1436 bfd_boolean dyn;
1437
1438 off = h->got.offset;
1439 BFD_ASSERT (off != (bfd_vma) -1);
1440
1441 dyn = elf_hash_table (info)->dynamic_sections_created;
1442 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1443 || (info->shared
1444 && (info->symbolic
1445 || h->dynindx == -1
1446 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
1447 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) != 0)
1448 {
1449 /* This is actually a static link, or it is a
1450 -Bsymbolic link and the symbol is defined
1451 locally, or the symbol was forced to be local
1452 because of a version file.. We must initialize
1453 this entry in the global offset table. Since
1454 the offset must always be a multiple of 4, we
1455 use the least significant bit to record whether
1456 we have initialized it already.
1457
1458 When doing a dynamic link, we create a .rela.got
1459 relocation entry to initialize the value. This
1460 is done in the finish_dynamic_symbol routine. */
1461 if ((off & 1) != 0)
1462 off &= ~1;
1463 else
1464 {
1465 bfd_put_32 (output_bfd, relocation,
1466 sgot->contents + off);
1467 h->got.offset |= 1;
1468 }
1469 }
1470 else
1471 unresolved_reloc = FALSE;
1472 }
1473 else
1474 {
1475 BFD_ASSERT (local_got_offsets != NULL
1476 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1477
1478 off = local_got_offsets[r_symndx];
1479
1480 /* The offset must always be a multiple of 4. We use
1481 the least significant bit to record whether we have
1482 already generated the necessary reloc. */
1483 if ((off & 1) != 0)
1484 off &= ~1;
1485 else
1486 {
1487 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1488
1489 if (info->shared)
1490 {
1491 asection *s;
1492 Elf_Internal_Rela outrel;
1493 bfd_byte *loc;
1494
1495 s = bfd_get_section_by_name (dynobj, ".rela.got");
1496 BFD_ASSERT (s != NULL);
1497
1498 outrel.r_offset = (sgot->output_section->vma
1499 + sgot->output_offset
1500 + off);
1501 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1502 outrel.r_addend = relocation;
1503 loc = s->contents;
1504 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1505 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1506 }
1507
1508 local_got_offsets[r_symndx] |= 1;
1509 }
1510 }
1511
1512 relocation = sgot->output_offset + off;
1513 if (r_type == R_68K_GOT8O
1514 || r_type == R_68K_GOT16O
1515 || r_type == R_68K_GOT32O)
1516 {
1517 /* This relocation does not use the addend. */
1518 rel->r_addend = 0;
1519 }
1520 else
1521 relocation += sgot->output_section->vma;
1522 }
1523 break;
1524
1525 case R_68K_PLT8:
1526 case R_68K_PLT16:
1527 case R_68K_PLT32:
1528 /* Relocation is to the entry for this symbol in the
1529 procedure linkage table. */
1530
1531 /* Resolve a PLTxx reloc against a local symbol directly,
1532 without using the procedure linkage table. */
1533 if (h == NULL)
1534 break;
1535
1536 if (h->plt.offset == (bfd_vma) -1
1537 || !elf_hash_table (info)->dynamic_sections_created)
1538 {
1539 /* We didn't make a PLT entry for this symbol. This
1540 happens when statically linking PIC code, or when
1541 using -Bsymbolic. */
1542 break;
1543 }
1544
1545 if (splt == NULL)
1546 {
1547 splt = bfd_get_section_by_name (dynobj, ".plt");
1548 BFD_ASSERT (splt != NULL);
1549 }
1550
1551 relocation = (splt->output_section->vma
1552 + splt->output_offset
1553 + h->plt.offset);
1554 unresolved_reloc = FALSE;
1555 break;
1556
1557 case R_68K_PLT8O:
1558 case R_68K_PLT16O:
1559 case R_68K_PLT32O:
1560 /* Relocation is the offset of the entry for this symbol in
1561 the procedure linkage table. */
1562 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1563
1564 if (splt == NULL)
1565 {
1566 splt = bfd_get_section_by_name (dynobj, ".plt");
1567 BFD_ASSERT (splt != NULL);
1568 }
1569
1570 relocation = h->plt.offset;
1571 unresolved_reloc = FALSE;
1572
1573 /* This relocation does not use the addend. */
1574 rel->r_addend = 0;
1575
1576 break;
1577
1578 case R_68K_PC8:
1579 case R_68K_PC16:
1580 case R_68K_PC32:
1581 if (h == NULL
1582 || (info->shared
1583 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1584 break;
1585 /* Fall through. */
1586 case R_68K_8:
1587 case R_68K_16:
1588 case R_68K_32:
1589 if (info->shared
1590 && r_symndx != 0
1591 && (input_section->flags & SEC_ALLOC) != 0
1592 && (h == NULL
1593 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1594 || h->root.type != bfd_link_hash_undefweak)
1595 && ((r_type != R_68K_PC8
1596 && r_type != R_68K_PC16
1597 && r_type != R_68K_PC32)
1598 || (h != NULL
1599 && h->dynindx != -1
1600 && (!info->symbolic
1601 || (h->elf_link_hash_flags
1602 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1603 {
1604 Elf_Internal_Rela outrel;
1605 bfd_byte *loc;
1606 bfd_boolean skip, relocate;
1607
1608 /* When generating a shared object, these relocations
1609 are copied into the output file to be resolved at run
1610 time. */
1611
1612 skip = FALSE;
1613 relocate = FALSE;
1614
1615 outrel.r_offset =
1616 _bfd_elf_section_offset (output_bfd, info, input_section,
1617 rel->r_offset);
1618 if (outrel.r_offset == (bfd_vma) -1)
1619 skip = TRUE;
1620 else if (outrel.r_offset == (bfd_vma) -2)
1621 skip = TRUE, relocate = TRUE;
1622 outrel.r_offset += (input_section->output_section->vma
1623 + input_section->output_offset);
1624
1625 if (skip)
1626 memset (&outrel, 0, sizeof outrel);
1627 else if (h != NULL
1628 && h->dynindx != -1
1629 && (r_type == R_68K_PC8
1630 || r_type == R_68K_PC16
1631 || r_type == R_68K_PC32
1632 || !info->shared
1633 || !info->symbolic
1634 || (h->elf_link_hash_flags
1635 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1636 {
1637 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1638 outrel.r_addend = rel->r_addend;
1639 }
1640 else
1641 {
1642 /* This symbol is local, or marked to become local. */
1643 if (r_type == R_68K_32)
1644 {
1645 relocate = TRUE;
1646 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1647 outrel.r_addend = relocation + rel->r_addend;
1648 }
1649 else
1650 {
1651 long indx;
1652
1653 if (bfd_is_abs_section (sec))
1654 indx = 0;
1655 else if (sec == NULL || sec->owner == NULL)
1656 {
1657 bfd_set_error (bfd_error_bad_value);
1658 return FALSE;
1659 }
1660 else
1661 {
1662 asection *osec;
1663
1664 osec = sec->output_section;
1665 indx = elf_section_data (osec)->dynindx;
1666 BFD_ASSERT (indx > 0);
1667 }
1668
1669 outrel.r_info = ELF32_R_INFO (indx, r_type);
1670 outrel.r_addend = relocation + rel->r_addend;
1671 }
1672 }
1673
1674 sreloc = elf_section_data (input_section)->sreloc;
1675 if (sreloc == NULL)
1676 abort ();
1677
1678 loc = sreloc->contents;
1679 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1680 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1681
1682 /* This reloc will be computed at runtime, so there's no
1683 need to do anything now, except for R_68K_32
1684 relocations that have been turned into
1685 R_68K_RELATIVE. */
1686 if (!relocate)
1687 continue;
1688 }
1689
1690 break;
1691
1692 case R_68K_GNU_VTINHERIT:
1693 case R_68K_GNU_VTENTRY:
1694 /* These are no-ops in the end. */
1695 continue;
1696
1697 default:
1698 break;
1699 }
1700
1701 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1702 because such sections are not SEC_ALLOC and thus ld.so will
1703 not process them. */
1704 if (unresolved_reloc
1705 && !((input_section->flags & SEC_DEBUGGING) != 0
1706 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1707 {
1708 (*_bfd_error_handler)
1709 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
1710 bfd_archive_filename (input_bfd),
1711 bfd_get_section_name (input_bfd, input_section),
1712 (long) rel->r_offset,
1713 h->root.root.string);
1714 return FALSE;
1715 }
1716
1717 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1718 contents, rel->r_offset,
1719 relocation, rel->r_addend);
1720
1721 if (r != bfd_reloc_ok)
1722 {
1723 const char *name;
1724
1725 if (h != NULL)
1726 name = h->root.root.string;
1727 else
1728 {
1729 name = bfd_elf_string_from_elf_section (input_bfd,
1730 symtab_hdr->sh_link,
1731 sym->st_name);
1732 if (name == NULL)
1733 return FALSE;
1734 if (*name == '\0')
1735 name = bfd_section_name (input_bfd, sec);
1736 }
1737
1738 if (r == bfd_reloc_overflow)
1739 {
1740 if (!(info->callbacks->reloc_overflow
1741 (info, name, howto->name, (bfd_vma) 0,
1742 input_bfd, input_section, rel->r_offset)))
1743 return FALSE;
1744 }
1745 else
1746 {
1747 (*_bfd_error_handler)
1748 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
1749 bfd_archive_filename (input_bfd),
1750 bfd_get_section_name (input_bfd, input_section),
1751 (long) rel->r_offset, name, (int) r);
1752 return FALSE;
1753 }
1754 }
1755 }
1756
1757 return TRUE;
1758 }
1759
1760 /* Finish up dynamic symbol handling. We set the contents of various
1761 dynamic sections here. */
1762
1763 static bfd_boolean
elf_m68k_finish_dynamic_symbol(output_bfd,info,h,sym)1764 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1765 bfd *output_bfd;
1766 struct bfd_link_info *info;
1767 struct elf_link_hash_entry *h;
1768 Elf_Internal_Sym *sym;
1769 {
1770 bfd *dynobj;
1771 int plt_off1, plt_off2, plt_off3;
1772
1773 dynobj = elf_hash_table (info)->dynobj;
1774
1775 if (h->plt.offset != (bfd_vma) -1)
1776 {
1777 asection *splt;
1778 asection *sgot;
1779 asection *srela;
1780 bfd_vma plt_index;
1781 bfd_vma got_offset;
1782 Elf_Internal_Rela rela;
1783 bfd_byte *loc;
1784
1785 /* This symbol has an entry in the procedure linkage table. Set
1786 it up. */
1787
1788 BFD_ASSERT (h->dynindx != -1);
1789
1790 splt = bfd_get_section_by_name (dynobj, ".plt");
1791 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1792 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1793 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1794
1795 /* Get the index in the procedure linkage table which
1796 corresponds to this symbol. This is the index of this symbol
1797 in all the symbols for which we are making plt entries. The
1798 first entry in the procedure linkage table is reserved. */
1799 if ( CPU32_FLAG (output_bfd))
1800 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1801 else
1802 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1803
1804 /* Get the offset into the .got table of the entry that
1805 corresponds to this function. Each .got entry is 4 bytes.
1806 The first three are reserved. */
1807 got_offset = (plt_index + 3) * 4;
1808
1809 if ( CPU32_FLAG (output_bfd))
1810 {
1811 /* Fill in the entry in the procedure linkage table. */
1812 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1813 PLT_CPU32_ENTRY_SIZE);
1814 plt_off1 = 4;
1815 plt_off2 = 12;
1816 plt_off3 = 18;
1817 }
1818 else
1819 {
1820 /* Fill in the entry in the procedure linkage table. */
1821 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1822 PLT_ENTRY_SIZE);
1823 plt_off1 = 4;
1824 plt_off2 = 10;
1825 plt_off3 = 16;
1826 }
1827
1828 /* The offset is relative to the first extension word. */
1829 bfd_put_32 (output_bfd,
1830 (sgot->output_section->vma
1831 + sgot->output_offset
1832 + got_offset
1833 - (splt->output_section->vma
1834 + h->plt.offset + 2)),
1835 splt->contents + h->plt.offset + plt_off1);
1836
1837 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1838 splt->contents + h->plt.offset + plt_off2);
1839 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1840 splt->contents + h->plt.offset + plt_off3);
1841
1842 /* Fill in the entry in the global offset table. */
1843 bfd_put_32 (output_bfd,
1844 (splt->output_section->vma
1845 + splt->output_offset
1846 + h->plt.offset
1847 + 8),
1848 sgot->contents + got_offset);
1849
1850 /* Fill in the entry in the .rela.plt section. */
1851 rela.r_offset = (sgot->output_section->vma
1852 + sgot->output_offset
1853 + got_offset);
1854 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1855 rela.r_addend = 0;
1856 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1857 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1858
1859 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1860 {
1861 /* Mark the symbol as undefined, rather than as defined in
1862 the .plt section. Leave the value alone. */
1863 sym->st_shndx = SHN_UNDEF;
1864 }
1865 }
1866
1867 if (h->got.offset != (bfd_vma) -1)
1868 {
1869 asection *sgot;
1870 asection *srela;
1871 Elf_Internal_Rela rela;
1872 bfd_byte *loc;
1873
1874 /* This symbol has an entry in the global offset table. Set it
1875 up. */
1876
1877 sgot = bfd_get_section_by_name (dynobj, ".got");
1878 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1879 BFD_ASSERT (sgot != NULL && srela != NULL);
1880
1881 rela.r_offset = (sgot->output_section->vma
1882 + sgot->output_offset
1883 + (h->got.offset &~ (bfd_vma) 1));
1884
1885 /* If this is a -Bsymbolic link, and the symbol is defined
1886 locally, we just want to emit a RELATIVE reloc. Likewise if
1887 the symbol was forced to be local because of a version file.
1888 The entry in the global offset table will already have been
1889 initialized in the relocate_section function. */
1890 if (info->shared
1891 && (info->symbolic
1892 || h->dynindx == -1
1893 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
1894 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1895 {
1896 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1897 rela.r_addend = bfd_get_signed_32 (output_bfd,
1898 (sgot->contents
1899 + (h->got.offset &~ (bfd_vma) 1)));
1900 }
1901 else
1902 {
1903 bfd_put_32 (output_bfd, (bfd_vma) 0,
1904 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1905 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1906 rela.r_addend = 0;
1907 }
1908
1909 loc = srela->contents;
1910 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1911 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1912 }
1913
1914 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1915 {
1916 asection *s;
1917 Elf_Internal_Rela rela;
1918 bfd_byte *loc;
1919
1920 /* This symbol needs a copy reloc. Set it up. */
1921
1922 BFD_ASSERT (h->dynindx != -1
1923 && (h->root.type == bfd_link_hash_defined
1924 || h->root.type == bfd_link_hash_defweak));
1925
1926 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1927 ".rela.bss");
1928 BFD_ASSERT (s != NULL);
1929
1930 rela.r_offset = (h->root.u.def.value
1931 + h->root.u.def.section->output_section->vma
1932 + h->root.u.def.section->output_offset);
1933 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1934 rela.r_addend = 0;
1935 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1936 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1937 }
1938
1939 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1940 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1941 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1942 sym->st_shndx = SHN_ABS;
1943
1944 return TRUE;
1945 }
1946
1947 /* Finish up the dynamic sections. */
1948
1949 static bfd_boolean
elf_m68k_finish_dynamic_sections(output_bfd,info)1950 elf_m68k_finish_dynamic_sections (output_bfd, info)
1951 bfd *output_bfd;
1952 struct bfd_link_info *info;
1953 {
1954 bfd *dynobj;
1955 asection *sgot;
1956 asection *sdyn;
1957
1958 dynobj = elf_hash_table (info)->dynobj;
1959
1960 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1961 BFD_ASSERT (sgot != NULL);
1962 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1963
1964 if (elf_hash_table (info)->dynamic_sections_created)
1965 {
1966 asection *splt;
1967 Elf32_External_Dyn *dyncon, *dynconend;
1968
1969 splt = bfd_get_section_by_name (dynobj, ".plt");
1970 BFD_ASSERT (splt != NULL && sdyn != NULL);
1971
1972 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1973 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1974 for (; dyncon < dynconend; dyncon++)
1975 {
1976 Elf_Internal_Dyn dyn;
1977 const char *name;
1978 asection *s;
1979
1980 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1981
1982 switch (dyn.d_tag)
1983 {
1984 default:
1985 break;
1986
1987 case DT_PLTGOT:
1988 name = ".got";
1989 goto get_vma;
1990 case DT_JMPREL:
1991 name = ".rela.plt";
1992 get_vma:
1993 s = bfd_get_section_by_name (output_bfd, name);
1994 BFD_ASSERT (s != NULL);
1995 dyn.d_un.d_ptr = s->vma;
1996 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1997 break;
1998
1999 case DT_PLTRELSZ:
2000 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2001 BFD_ASSERT (s != NULL);
2002 if (s->_cooked_size != 0)
2003 dyn.d_un.d_val = s->_cooked_size;
2004 else
2005 dyn.d_un.d_val = s->_raw_size;
2006 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2007 break;
2008
2009 case DT_RELASZ:
2010 /* The procedure linkage table relocs (DT_JMPREL) should
2011 not be included in the overall relocs (DT_RELA).
2012 Therefore, we override the DT_RELASZ entry here to
2013 make it not include the JMPREL relocs. Since the
2014 linker script arranges for .rela.plt to follow all
2015 other relocation sections, we don't have to worry
2016 about changing the DT_RELA entry. */
2017 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2018 if (s != NULL)
2019 {
2020 if (s->_cooked_size != 0)
2021 dyn.d_un.d_val -= s->_cooked_size;
2022 else
2023 dyn.d_un.d_val -= s->_raw_size;
2024 }
2025 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2026 break;
2027 }
2028 }
2029
2030 /* Fill in the first entry in the procedure linkage table. */
2031 if (splt->_raw_size > 0)
2032 {
2033 if (!CPU32_FLAG (output_bfd))
2034 {
2035 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2036 bfd_put_32 (output_bfd,
2037 (sgot->output_section->vma
2038 + sgot->output_offset + 4
2039 - (splt->output_section->vma + 2)),
2040 splt->contents + 4);
2041 bfd_put_32 (output_bfd,
2042 (sgot->output_section->vma
2043 + sgot->output_offset + 8
2044 - (splt->output_section->vma + 10)),
2045 splt->contents + 12);
2046 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2047 = PLT_ENTRY_SIZE;
2048 }
2049 else /* cpu32 */
2050 {
2051 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2052 bfd_put_32 (output_bfd,
2053 (sgot->output_section->vma
2054 + sgot->output_offset + 4
2055 - (splt->output_section->vma + 2)),
2056 splt->contents + 4);
2057 bfd_put_32 (output_bfd,
2058 (sgot->output_section->vma
2059 + sgot->output_offset + 8
2060 - (splt->output_section->vma + 10)),
2061 splt->contents + 12);
2062 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2063 = PLT_CPU32_ENTRY_SIZE;
2064 }
2065 }
2066 }
2067
2068 /* Fill in the first three entries in the global offset table. */
2069 if (sgot->_raw_size > 0)
2070 {
2071 if (sdyn == NULL)
2072 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2073 else
2074 bfd_put_32 (output_bfd,
2075 sdyn->output_section->vma + sdyn->output_offset,
2076 sgot->contents);
2077 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2078 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2079 }
2080
2081 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2082
2083 return TRUE;
2084 }
2085
2086 /* Given a .data section and a .emreloc in-memory section, store
2087 relocation information into the .emreloc section which can be
2088 used at runtime to relocate the section. This is called by the
2089 linker when the --embedded-relocs switch is used. This is called
2090 after the add_symbols entry point has been called for all the
2091 objects, and before the final_link entry point is called. */
2092
2093 bfd_boolean
bfd_m68k_elf32_create_embedded_relocs(abfd,info,datasec,relsec,errmsg)2094 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2095 bfd *abfd;
2096 struct bfd_link_info *info;
2097 asection *datasec;
2098 asection *relsec;
2099 char **errmsg;
2100 {
2101 Elf_Internal_Shdr *symtab_hdr;
2102 Elf_Internal_Sym *isymbuf = NULL;
2103 Elf_Internal_Rela *internal_relocs = NULL;
2104 Elf_Internal_Rela *irel, *irelend;
2105 bfd_byte *p;
2106 bfd_size_type amt;
2107
2108 BFD_ASSERT (! info->relocatable);
2109
2110 *errmsg = NULL;
2111
2112 if (datasec->reloc_count == 0)
2113 return TRUE;
2114
2115 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2116
2117 /* Get a copy of the native relocations. */
2118 internal_relocs = (_bfd_elf_link_read_relocs
2119 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2120 info->keep_memory));
2121 if (internal_relocs == NULL)
2122 goto error_return;
2123
2124 amt = (bfd_size_type) datasec->reloc_count * 12;
2125 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2126 if (relsec->contents == NULL)
2127 goto error_return;
2128
2129 p = relsec->contents;
2130
2131 irelend = internal_relocs + datasec->reloc_count;
2132 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2133 {
2134 asection *targetsec;
2135
2136 /* We are going to write a four byte longword into the runtime
2137 reloc section. The longword will be the address in the data
2138 section which must be relocated. It is followed by the name
2139 of the target section NUL-padded or truncated to 8
2140 characters. */
2141
2142 /* We can only relocate absolute longword relocs at run time. */
2143 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2144 {
2145 *errmsg = _("unsupported reloc type");
2146 bfd_set_error (bfd_error_bad_value);
2147 goto error_return;
2148 }
2149
2150 /* Get the target section referred to by the reloc. */
2151 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2152 {
2153 /* A local symbol. */
2154 Elf_Internal_Sym *isym;
2155
2156 /* Read this BFD's local symbols if we haven't done so already. */
2157 if (isymbuf == NULL)
2158 {
2159 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2160 if (isymbuf == NULL)
2161 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2162 symtab_hdr->sh_info, 0,
2163 NULL, NULL, NULL);
2164 if (isymbuf == NULL)
2165 goto error_return;
2166 }
2167
2168 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2169 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2170 }
2171 else
2172 {
2173 unsigned long indx;
2174 struct elf_link_hash_entry *h;
2175
2176 /* An external symbol. */
2177 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2178 h = elf_sym_hashes (abfd)[indx];
2179 BFD_ASSERT (h != NULL);
2180 if (h->root.type == bfd_link_hash_defined
2181 || h->root.type == bfd_link_hash_defweak)
2182 targetsec = h->root.u.def.section;
2183 else
2184 targetsec = NULL;
2185 }
2186
2187 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2188 memset (p + 4, 0, 8);
2189 if (targetsec != NULL)
2190 strncpy (p + 4, targetsec->output_section->name, 8);
2191 }
2192
2193 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2194 free (isymbuf);
2195 if (internal_relocs != NULL
2196 && elf_section_data (datasec)->relocs != internal_relocs)
2197 free (internal_relocs);
2198 return TRUE;
2199
2200 error_return:
2201 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2202 free (isymbuf);
2203 if (internal_relocs != NULL
2204 && elf_section_data (datasec)->relocs != internal_relocs)
2205 free (internal_relocs);
2206 return FALSE;
2207 }
2208
2209 static enum elf_reloc_type_class
elf32_m68k_reloc_type_class(rela)2210 elf32_m68k_reloc_type_class (rela)
2211 const Elf_Internal_Rela *rela;
2212 {
2213 switch ((int) ELF32_R_TYPE (rela->r_info))
2214 {
2215 case R_68K_RELATIVE:
2216 return reloc_class_relative;
2217 case R_68K_JMP_SLOT:
2218 return reloc_class_plt;
2219 case R_68K_COPY:
2220 return reloc_class_copy;
2221 default:
2222 return reloc_class_normal;
2223 }
2224 }
2225
2226 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2227 #define TARGET_BIG_NAME "elf32-m68k"
2228 #define ELF_MACHINE_CODE EM_68K
2229 #define ELF_MAXPAGESIZE 0x2000
2230 #define elf_backend_create_dynamic_sections \
2231 _bfd_elf_create_dynamic_sections
2232 #define bfd_elf32_bfd_link_hash_table_create \
2233 elf_m68k_link_hash_table_create
2234 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
2235
2236 #define elf_backend_check_relocs elf_m68k_check_relocs
2237 #define elf_backend_adjust_dynamic_symbol \
2238 elf_m68k_adjust_dynamic_symbol
2239 #define elf_backend_size_dynamic_sections \
2240 elf_m68k_size_dynamic_sections
2241 #define elf_backend_relocate_section elf_m68k_relocate_section
2242 #define elf_backend_finish_dynamic_symbol \
2243 elf_m68k_finish_dynamic_symbol
2244 #define elf_backend_finish_dynamic_sections \
2245 elf_m68k_finish_dynamic_sections
2246 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2247 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2248 #define bfd_elf32_bfd_merge_private_bfd_data \
2249 elf32_m68k_merge_private_bfd_data
2250 #define bfd_elf32_bfd_set_private_flags \
2251 elf32_m68k_set_private_flags
2252 #define bfd_elf32_bfd_print_private_bfd_data \
2253 elf32_m68k_print_private_bfd_data
2254 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2255
2256 #define elf_backend_can_gc_sections 1
2257 #define elf_backend_can_refcount 1
2258 #define elf_backend_want_got_plt 1
2259 #define elf_backend_plt_readonly 1
2260 #define elf_backend_want_plt_sym 0
2261 #define elf_backend_got_header_size 12
2262 #define elf_backend_rela_normal 1
2263
2264 #include "elf32-target.h"
2265