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[binutils.git] / bfd / elf32-m68k.c
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1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
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"
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 *));
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 *));
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),
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;
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)];
133 #define elf_info_to_howto rtype_to_howto
135 static const struct
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 },
168 static reloc_howto_type *
169 reloc_type_lookup (abfd, code)
170 bfd *abfd ATTRIBUTE_UNUSED;
171 bfd_reloc_code_real_type code;
173 unsigned int i;
174 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
176 if (reloc_map[i].bfd_val == code)
177 return &howto_table[reloc_map[i].elf_val];
179 return 0;
182 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
183 #define ELF_ARCH bfd_arch_m68k
185 /* Functions for the m68k ELF linker. */
187 /* The name of the dynamic interpreter. This is put in the .interp
188 section. */
190 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
192 /* The size in bytes of an entry in the procedure linkage table. */
194 #define PLT_ENTRY_SIZE 20
196 /* The first entry in a procedure linkage table looks like this. See
197 the SVR4 ABI m68k supplement to see how this works. */
199 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
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. */
208 /* Subsequent entries in a procedure linkage table look like this. */
210 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
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. */
220 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
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] =
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
235 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
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
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. */
253 /* This structure keeps track of the number of PC relative relocs we have
254 copied for a given symbol. */
256 struct elf_m68k_pcrel_relocs_copied
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;
266 /* m68k ELF linker hash entry. */
268 struct elf_m68k_link_hash_entry
270 struct elf_link_hash_entry root;
272 /* Number of PC relative relocs copied for this symbol. */
273 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
276 #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent))
278 /* m68k ELF linker hash table. */
280 struct elf_m68k_link_hash_table
282 struct elf_link_hash_table root;
284 /* Small local sym to section mapping cache. */
285 struct sym_sec_cache sym_sec;
288 /* Get the m68k ELF linker hash table from a link_info structure. */
290 #define elf_m68k_hash_table(p) \
291 ((struct elf_m68k_link_hash_table *) (p)->hash)
293 /* Create an entry in an m68k ELF linker hash table. */
295 static struct bfd_hash_entry *
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;
301 struct bfd_hash_entry *ret = entry;
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;
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;
316 return ret;
319 /* Create an m68k ELF linker hash table. */
321 static struct bfd_link_hash_table *
322 elf_m68k_link_hash_table_create (abfd)
323 bfd *abfd;
325 struct elf_m68k_link_hash_table *ret;
326 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table);
328 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt);
329 if (ret == (struct elf_m68k_link_hash_table *) NULL)
330 return NULL;
332 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
333 elf_m68k_link_hash_newfunc))
335 free (ret);
336 return NULL;
339 ret->sym_sec.abfd = NULL;
341 return &ret->root.root;
344 /* Keep m68k-specific flags in the ELF header. */
345 static bfd_boolean
346 elf32_m68k_set_private_flags (abfd, flags)
347 bfd *abfd;
348 flagword flags;
350 elf_elfheader (abfd)->e_flags = flags;
351 elf_flags_init (abfd) = TRUE;
352 return TRUE;
355 /* Merge backend specific data from an object file to the output
356 object file when linking. */
357 static bfd_boolean
358 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
359 bfd *ibfd;
360 bfd *obfd;
362 flagword out_flags;
363 flagword in_flags;
365 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
366 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
367 return TRUE;
369 in_flags = elf_elfheader (ibfd)->e_flags;
370 out_flags = elf_elfheader (obfd)->e_flags;
372 if (!elf_flags_init (obfd))
374 elf_flags_init (obfd) = TRUE;
375 elf_elfheader (obfd)->e_flags = in_flags;
378 return TRUE;
381 /* Display the flags field. */
382 static bfd_boolean
383 elf32_m68k_print_private_bfd_data (abfd, ptr)
384 bfd *abfd;
385 PTR ptr;
387 FILE *file = (FILE *) ptr;
389 BFD_ASSERT (abfd != NULL && ptr != NULL);
391 /* Print normal ELF private data. */
392 _bfd_elf_print_private_bfd_data (abfd, ptr);
394 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
396 /* xgettext:c-format */
397 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
399 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
400 fprintf (file, _(" [cpu32]"));
402 if (elf_elfheader (abfd)->e_flags & EF_M68000)
403 fprintf (file, _(" [m68000]"));
405 fputc ('\n', file);
407 return TRUE;
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. */
413 static bfd_boolean
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;
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;
430 if (info->relocatable)
431 return TRUE;
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);
438 sgot = NULL;
439 srelgot = NULL;
440 sreloc = NULL;
442 rel_end = relocs + sec->reloc_count;
443 for (rel = relocs; rel < rel_end; rel++)
445 unsigned long r_symndx;
446 struct elf_link_hash_entry *h;
448 r_symndx = ELF32_R_SYM (rel->r_info);
450 if (r_symndx < symtab_hdr->sh_info)
451 h = NULL;
452 else
453 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
455 switch (ELF32_R_TYPE (rel->r_info))
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. */
469 if (dynobj == NULL)
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;
477 if (sgot == NULL)
479 sgot = bfd_get_section_by_name (dynobj, ".got");
480 BFD_ASSERT (sgot != NULL);
483 if (srelgot == NULL
484 && (h != NULL || info->shared))
486 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
487 if (srelgot == NULL)
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;
503 if (h != NULL)
505 if (h->got.refcount == 0)
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)
511 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
512 return FALSE;
515 /* Allocate space in the .got section. */
516 sgot->_raw_size += 4;
517 /* Allocate relocation space. */
518 srelgot->_raw_size += sizeof (Elf32_External_Rela);
520 h->got.refcount++;
522 else
524 /* This is a global offset table entry for a local symbol. */
525 if (local_got_refcounts == NULL)
527 bfd_size_type size;
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;
537 if (local_got_refcounts[r_symndx] == 0)
539 sgot->_raw_size += 4;
540 if (info->shared)
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);
548 local_got_refcounts[r_symndx]++;
550 break;
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. */
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;
567 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
568 h->plt.refcount++;
569 break;
571 case R_68K_PLT8O:
572 case R_68K_PLT16O:
573 case R_68K_PLT32O:
574 /* This symbol requires a procedure linkage table entry. */
576 if (h == NULL)
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;
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)
589 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
590 return FALSE;
593 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
594 h->plt.refcount++;
595 break;
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)))
618 if (h != NULL)
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++;
625 break;
627 /* Fall through. */
628 case R_68K_8:
629 case R_68K_16:
630 case R_68K_32:
631 if (h != NULL)
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++;
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)
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)
648 const char *name;
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;
657 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
658 && strcmp (bfd_get_section_name (abfd, sec),
659 name + 5) == 0);
661 sreloc = bfd_get_section_by_name (dynobj, name);
662 if (sreloc == NULL)
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;
676 elf_section_data (sec)->sreloc = sreloc;
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;
687 sreloc->_raw_size += sizeof (Elf32_External_Rela);
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)
701 struct elf_m68k_pcrel_relocs_copied *p;
702 struct elf_m68k_pcrel_relocs_copied **head;
704 if (h != NULL)
706 struct elf_m68k_link_hash_entry *eh
707 = elf_m68k_hash_entry (h);
708 head = &eh->pcrel_relocs_copied;
710 else
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;
719 head = ((struct elf_m68k_pcrel_relocs_copied **)
720 &elf_section_data (s)->local_dynrel);
723 for (p = *head; p != NULL; p = p->next)
724 if (p->section == sreloc)
725 break;
727 if (p == NULL)
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;
739 ++p->count;
743 break;
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_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
749 return FALSE;
750 break;
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_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
756 return FALSE;
757 break;
759 default:
760 break;
764 return TRUE;
767 /* Return the section that should be marked against GC for a given
768 relocation. */
770 static asection *
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;
778 if (h != NULL)
780 switch (ELF32_R_TYPE (rel->r_info))
782 case R_68K_GNU_VTINHERIT:
783 case R_68K_GNU_VTENTRY:
784 break;
786 default:
787 switch (h->root.type)
789 default:
790 break;
792 case bfd_link_hash_defined:
793 case bfd_link_hash_defweak:
794 return h->root.u.def.section;
796 case bfd_link_hash_common:
797 return h->root.u.c.p->section;
801 else
802 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
804 return NULL;
807 /* Update the got entry reference counts for the section being removed. */
809 static bfd_boolean
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;
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 unsigned long r_symndx;
821 struct elf_link_hash_entry *h;
822 bfd *dynobj;
823 asection *sgot;
824 asection *srelgot;
826 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
827 sym_hashes = elf_sym_hashes (abfd);
828 local_got_refcounts = elf_local_got_refcounts (abfd);
830 dynobj = elf_hash_table (info)->dynobj;
831 if (dynobj == NULL)
832 return TRUE;
834 sgot = bfd_get_section_by_name (dynobj, ".got");
835 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
837 relend = relocs + sec->reloc_count;
838 for (rel = relocs; rel < relend; rel++)
840 switch (ELF32_R_TYPE (rel->r_info))
842 case R_68K_GOT8:
843 case R_68K_GOT16:
844 case R_68K_GOT32:
845 case R_68K_GOT8O:
846 case R_68K_GOT16O:
847 case R_68K_GOT32O:
848 r_symndx = ELF32_R_SYM (rel->r_info);
849 if (r_symndx >= symtab_hdr->sh_info)
851 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
852 if (h->got.refcount > 0)
854 --h->got.refcount;
855 if (h->got.refcount == 0)
857 /* We don't need the .got entry any more. */
858 sgot->_raw_size -= 4;
859 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
863 else if (local_got_refcounts != NULL)
865 if (local_got_refcounts[r_symndx] > 0)
867 --local_got_refcounts[r_symndx];
868 if (local_got_refcounts[r_symndx] == 0)
870 /* We don't need the .got entry any more. */
871 sgot->_raw_size -= 4;
872 if (info->shared)
873 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
877 break;
879 case R_68K_PLT8:
880 case R_68K_PLT16:
881 case R_68K_PLT32:
882 case R_68K_PLT8O:
883 case R_68K_PLT16O:
884 case R_68K_PLT32O:
885 case R_68K_PC8:
886 case R_68K_PC16:
887 case R_68K_PC32:
888 case R_68K_8:
889 case R_68K_16:
890 case R_68K_32:
891 r_symndx = ELF32_R_SYM (rel->r_info);
892 if (r_symndx >= symtab_hdr->sh_info)
894 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
895 if (h->plt.refcount > 0)
896 --h->plt.refcount;
898 break;
900 default:
901 break;
905 return TRUE;
908 /* Adjust a symbol defined by a dynamic object and referenced by a
909 regular object. The current definition is in some section of the
910 dynamic object, but we're not including those sections. We have to
911 change the definition to something the rest of the link can
912 understand. */
914 static bfd_boolean
915 elf_m68k_adjust_dynamic_symbol (info, h)
916 struct bfd_link_info *info;
917 struct elf_link_hash_entry *h;
919 bfd *dynobj;
920 asection *s;
921 unsigned int power_of_two;
923 dynobj = elf_hash_table (info)->dynobj;
925 /* Make sure we know what is going on here. */
926 BFD_ASSERT (dynobj != NULL
927 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
928 || h->weakdef != NULL
929 || ((h->elf_link_hash_flags
930 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
931 && (h->elf_link_hash_flags
932 & ELF_LINK_HASH_REF_REGULAR) != 0
933 && (h->elf_link_hash_flags
934 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
936 /* If this is a function, put it in the procedure linkage table. We
937 will fill in the contents of the procedure linkage table later,
938 when we know the address of the .got section. */
939 if (h->type == STT_FUNC
940 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
942 if (! info->shared
943 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
944 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
945 /* We must always create the plt entry if it was referenced
946 by a PLTxxO relocation. In this case we already recorded
947 it as a dynamic symbol. */
948 && h->dynindx == -1)
950 /* This case can occur if we saw a PLTxx reloc in an input
951 file, but the symbol was never referred to by a dynamic
952 object. In such a case, we don't actually need to build
953 a procedure linkage table, and we can just do a PCxx
954 reloc instead. */
955 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
956 h->plt.offset = (bfd_vma) -1;
957 return TRUE;
960 /* GC may have rendered this entry unused. */
961 if (h->plt.refcount <= 0)
963 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
964 h->plt.offset = (bfd_vma) -1;
965 return TRUE;
968 /* Make sure this symbol is output as a dynamic symbol. */
969 if (h->dynindx == -1
970 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
972 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
973 return FALSE;
976 s = bfd_get_section_by_name (dynobj, ".plt");
977 BFD_ASSERT (s != NULL);
979 /* If this is the first .plt entry, make room for the special
980 first entry. */
981 if (s->_raw_size == 0)
983 if (CPU32_FLAG (dynobj))
984 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
985 else
986 s->_raw_size += PLT_ENTRY_SIZE;
989 /* If this symbol is not defined in a regular file, and we are
990 not generating a shared library, then set the symbol to this
991 location in the .plt. This is required to make function
992 pointers compare as equal between the normal executable and
993 the shared library. */
994 if (!info->shared
995 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
997 h->root.u.def.section = s;
998 h->root.u.def.value = s->_raw_size;
1001 h->plt.offset = s->_raw_size;
1003 /* Make room for this entry. */
1004 if (CPU32_FLAG (dynobj))
1005 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1006 else
1007 s->_raw_size += PLT_ENTRY_SIZE;
1009 /* We also need to make an entry in the .got.plt section, which
1010 will be placed in the .got section by the linker script. */
1011 s = bfd_get_section_by_name (dynobj, ".got.plt");
1012 BFD_ASSERT (s != NULL);
1013 s->_raw_size += 4;
1015 /* We also need to make an entry in the .rela.plt section. */
1016 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1017 BFD_ASSERT (s != NULL);
1018 s->_raw_size += sizeof (Elf32_External_Rela);
1020 return TRUE;
1023 /* Reinitialize the plt offset now that it is not used as a reference
1024 count any more. */
1025 h->plt.offset = (bfd_vma) -1;
1027 /* If this is a weak symbol, and there is a real definition, the
1028 processor independent code will have arranged for us to see the
1029 real definition first, and we can just use the same value. */
1030 if (h->weakdef != NULL)
1032 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1033 || h->weakdef->root.type == bfd_link_hash_defweak);
1034 h->root.u.def.section = h->weakdef->root.u.def.section;
1035 h->root.u.def.value = h->weakdef->root.u.def.value;
1036 return TRUE;
1039 /* This is a reference to a symbol defined by a dynamic object which
1040 is not a function. */
1042 /* If we are creating a shared library, we must presume that the
1043 only references to the symbol are via the global offset table.
1044 For such cases we need not do anything here; the relocations will
1045 be handled correctly by relocate_section. */
1046 if (info->shared)
1047 return TRUE;
1049 /* We must allocate the symbol in our .dynbss section, which will
1050 become part of the .bss section of the executable. There will be
1051 an entry for this symbol in the .dynsym section. The dynamic
1052 object will contain position independent code, so all references
1053 from the dynamic object to this symbol will go through the global
1054 offset table. The dynamic linker will use the .dynsym entry to
1055 determine the address it must put in the global offset table, so
1056 both the dynamic object and the regular object will refer to the
1057 same memory location for the variable. */
1059 s = bfd_get_section_by_name (dynobj, ".dynbss");
1060 BFD_ASSERT (s != NULL);
1062 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1063 copy the initial value out of the dynamic object and into the
1064 runtime process image. We need to remember the offset into the
1065 .rela.bss section we are going to use. */
1066 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1068 asection *srel;
1070 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1071 BFD_ASSERT (srel != NULL);
1072 srel->_raw_size += sizeof (Elf32_External_Rela);
1073 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1076 /* We need to figure out the alignment required for this symbol. I
1077 have no idea how ELF linkers handle this. */
1078 power_of_two = bfd_log2 (h->size);
1079 if (power_of_two > 3)
1080 power_of_two = 3;
1082 /* Apply the required alignment. */
1083 s->_raw_size = BFD_ALIGN (s->_raw_size,
1084 (bfd_size_type) (1 << power_of_two));
1085 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1087 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1088 return FALSE;
1091 /* Define the symbol as being at this point in the section. */
1092 h->root.u.def.section = s;
1093 h->root.u.def.value = s->_raw_size;
1095 /* Increment the section size to make room for the symbol. */
1096 s->_raw_size += h->size;
1098 return TRUE;
1101 /* This is the condition under which elf_m68k_finish_dynamic_symbol
1102 will be called from elflink.h. If elflink.h doesn't call our
1103 finish_dynamic_symbol routine, we'll need to do something about
1104 initializing any .plt and .got entries in elf_m68k_relocate_section. */
1105 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1106 ((DYN) \
1107 && ((SHARED) \
1108 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1109 && ((H)->dynindx != -1 \
1110 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1112 /* Set the sizes of the dynamic sections. */
1114 static bfd_boolean
1115 elf_m68k_size_dynamic_sections (output_bfd, info)
1116 bfd *output_bfd ATTRIBUTE_UNUSED;
1117 struct bfd_link_info *info;
1119 bfd *dynobj;
1120 asection *s;
1121 bfd_boolean plt;
1122 bfd_boolean relocs;
1124 dynobj = elf_hash_table (info)->dynobj;
1125 BFD_ASSERT (dynobj != NULL);
1127 if (elf_hash_table (info)->dynamic_sections_created)
1129 /* Set the contents of the .interp section to the interpreter. */
1130 if (info->executable)
1132 s = bfd_get_section_by_name (dynobj, ".interp");
1133 BFD_ASSERT (s != NULL);
1134 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1135 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1138 else
1140 /* We may have created entries in the .rela.got section.
1141 However, if we are not creating the dynamic sections, we will
1142 not actually use these entries. Reset the size of .rela.got,
1143 which will cause it to get stripped from the output file
1144 below. */
1145 s = bfd_get_section_by_name (dynobj, ".rela.got");
1146 if (s != NULL)
1147 s->_raw_size = 0;
1150 /* If this is a -Bsymbolic shared link, then we need to discard all
1151 PC relative relocs against symbols defined in a regular object.
1152 For the normal shared case we discard the PC relative relocs
1153 against symbols that have become local due to visibility changes.
1154 We allocated space for them in the check_relocs routine, but we
1155 will not fill them in in the relocate_section routine. */
1156 if (info->shared)
1157 elf_link_hash_traverse (elf_hash_table (info),
1158 elf_m68k_discard_copies,
1159 (PTR) info);
1161 /* The check_relocs and adjust_dynamic_symbol entry points have
1162 determined the sizes of the various dynamic sections. Allocate
1163 memory for them. */
1164 plt = FALSE;
1165 relocs = FALSE;
1166 for (s = dynobj->sections; s != NULL; s = s->next)
1168 const char *name;
1169 bfd_boolean strip;
1171 if ((s->flags & SEC_LINKER_CREATED) == 0)
1172 continue;
1174 /* It's OK to base decisions on the section name, because none
1175 of the dynobj section names depend upon the input files. */
1176 name = bfd_get_section_name (dynobj, s);
1178 strip = FALSE;
1180 if (strcmp (name, ".plt") == 0)
1182 if (s->_raw_size == 0)
1184 /* Strip this section if we don't need it; see the
1185 comment below. */
1186 strip = TRUE;
1188 else
1190 /* Remember whether there is a PLT. */
1191 plt = TRUE;
1194 else if (strncmp (name, ".rela", 5) == 0)
1196 if (s->_raw_size == 0)
1198 /* If we don't need this section, strip it from the
1199 output file. This is mostly to handle .rela.bss and
1200 .rela.plt. We must create both sections in
1201 create_dynamic_sections, because they must be created
1202 before the linker maps input sections to output
1203 sections. The linker does that before
1204 adjust_dynamic_symbol is called, and it is that
1205 function which decides whether anything needs to go
1206 into these sections. */
1207 strip = TRUE;
1209 else
1211 relocs = TRUE;
1213 /* We use the reloc_count field as a counter if we need
1214 to copy relocs into the output file. */
1215 s->reloc_count = 0;
1218 else if (strncmp (name, ".got", 4) != 0)
1220 /* It's not one of our sections, so don't allocate space. */
1221 continue;
1224 if (strip)
1226 _bfd_strip_section_from_output (info, s);
1227 continue;
1230 /* Allocate memory for the section contents. */
1231 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1232 Unused entries should be reclaimed before the section's contents
1233 are written out, but at the moment this does not happen. Thus in
1234 order to prevent writing out garbage, we initialise the section's
1235 contents to zero. */
1236 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1237 if (s->contents == NULL && s->_raw_size != 0)
1238 return FALSE;
1241 if (elf_hash_table (info)->dynamic_sections_created)
1243 /* Add some entries to the .dynamic section. We fill in the
1244 values later, in elf_m68k_finish_dynamic_sections, but we
1245 must add the entries now so that we get the correct size for
1246 the .dynamic section. The DT_DEBUG entry is filled in by the
1247 dynamic linker and used by the debugger. */
1248 #define add_dynamic_entry(TAG, VAL) \
1249 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1251 if (!info->shared)
1253 if (!add_dynamic_entry (DT_DEBUG, 0))
1254 return FALSE;
1257 if (plt)
1259 if (!add_dynamic_entry (DT_PLTGOT, 0)
1260 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1261 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1262 || !add_dynamic_entry (DT_JMPREL, 0))
1263 return FALSE;
1266 if (relocs)
1268 if (!add_dynamic_entry (DT_RELA, 0)
1269 || !add_dynamic_entry (DT_RELASZ, 0)
1270 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1271 return FALSE;
1274 if ((info->flags & DF_TEXTREL) != 0)
1276 if (!add_dynamic_entry (DT_TEXTREL, 0))
1277 return FALSE;
1280 #undef add_dynamic_entry
1282 return TRUE;
1285 /* This function is called via elf_link_hash_traverse if we are
1286 creating a shared object. In the -Bsymbolic case it discards the
1287 space allocated to copy PC relative relocs against symbols which
1288 are defined in regular objects. For the normal shared case, it
1289 discards space for pc-relative relocs that have become local due to
1290 symbol visibility changes. We allocated space for them in the
1291 check_relocs routine, but we won't fill them in in the
1292 relocate_section routine.
1294 We also check whether any of the remaining relocations apply
1295 against a readonly section, and set the DF_TEXTREL flag in this
1296 case. */
1298 static bfd_boolean
1299 elf_m68k_discard_copies (h, inf)
1300 struct elf_link_hash_entry *h;
1301 PTR inf;
1303 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1304 struct elf_m68k_pcrel_relocs_copied *s;
1306 if (h->root.type == bfd_link_hash_warning)
1307 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1309 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
1310 || (!info->symbolic
1311 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0))
1313 if ((info->flags & DF_TEXTREL) == 0)
1315 /* Look for relocations against read-only sections. */
1316 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1317 s != NULL;
1318 s = s->next)
1319 if ((s->section->flags & SEC_READONLY) != 0)
1321 info->flags |= DF_TEXTREL;
1322 break;
1326 return TRUE;
1329 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1330 s != NULL;
1331 s = s->next)
1332 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1334 return TRUE;
1337 /* Relocate an M68K ELF section. */
1339 static bfd_boolean
1340 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1341 contents, relocs, local_syms, local_sections)
1342 bfd *output_bfd;
1343 struct bfd_link_info *info;
1344 bfd *input_bfd;
1345 asection *input_section;
1346 bfd_byte *contents;
1347 Elf_Internal_Rela *relocs;
1348 Elf_Internal_Sym *local_syms;
1349 asection **local_sections;
1351 bfd *dynobj;
1352 Elf_Internal_Shdr *symtab_hdr;
1353 struct elf_link_hash_entry **sym_hashes;
1354 bfd_vma *local_got_offsets;
1355 asection *sgot;
1356 asection *splt;
1357 asection *sreloc;
1358 Elf_Internal_Rela *rel;
1359 Elf_Internal_Rela *relend;
1361 if (info->relocatable)
1362 return TRUE;
1364 dynobj = elf_hash_table (info)->dynobj;
1365 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1366 sym_hashes = elf_sym_hashes (input_bfd);
1367 local_got_offsets = elf_local_got_offsets (input_bfd);
1369 sgot = NULL;
1370 splt = NULL;
1371 sreloc = NULL;
1373 rel = relocs;
1374 relend = relocs + input_section->reloc_count;
1375 for (; rel < relend; rel++)
1377 int r_type;
1378 reloc_howto_type *howto;
1379 unsigned long r_symndx;
1380 struct elf_link_hash_entry *h;
1381 Elf_Internal_Sym *sym;
1382 asection *sec;
1383 bfd_vma relocation;
1384 bfd_boolean unresolved_reloc;
1385 bfd_reloc_status_type r;
1387 r_type = ELF32_R_TYPE (rel->r_info);
1388 if (r_type < 0 || r_type >= (int) R_68K_max)
1390 bfd_set_error (bfd_error_bad_value);
1391 return FALSE;
1393 howto = howto_table + r_type;
1395 r_symndx = ELF32_R_SYM (rel->r_info);
1397 h = NULL;
1398 sym = NULL;
1399 sec = NULL;
1400 unresolved_reloc = FALSE;
1402 if (r_symndx < symtab_hdr->sh_info)
1404 sym = local_syms + r_symndx;
1405 sec = local_sections[r_symndx];
1406 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1408 else
1410 bfd_boolean warned;
1412 RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx, symtab_hdr, relocation, sec, unresolved_reloc, info, warned);
1415 switch (r_type)
1417 case R_68K_GOT8:
1418 case R_68K_GOT16:
1419 case R_68K_GOT32:
1420 /* Relocation is to the address of the entry for this symbol
1421 in the global offset table. */
1422 if (h != NULL
1423 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1424 break;
1425 /* Fall through. */
1426 case R_68K_GOT8O:
1427 case R_68K_GOT16O:
1428 case R_68K_GOT32O:
1429 /* Relocation is the offset of the entry for this symbol in
1430 the global offset table. */
1433 bfd_vma off;
1435 if (sgot == NULL)
1437 sgot = bfd_get_section_by_name (dynobj, ".got");
1438 BFD_ASSERT (sgot != NULL);
1441 if (h != NULL)
1443 bfd_boolean dyn;
1445 off = h->got.offset;
1446 BFD_ASSERT (off != (bfd_vma) -1);
1448 dyn = elf_hash_table (info)->dynamic_sections_created;
1449 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1450 || (info->shared
1451 && (info->symbolic
1452 || h->dynindx == -1
1453 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
1454 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) != 0)
1456 /* This is actually a static link, or it is a
1457 -Bsymbolic link and the symbol is defined
1458 locally, or the symbol was forced to be local
1459 because of a version file.. We must initialize
1460 this entry in the global offset table. Since
1461 the offset must always be a multiple of 4, we
1462 use the least significant bit to record whether
1463 we have initialized it already.
1465 When doing a dynamic link, we create a .rela.got
1466 relocation entry to initialize the value. This
1467 is done in the finish_dynamic_symbol routine. */
1468 if ((off & 1) != 0)
1469 off &= ~1;
1470 else
1472 bfd_put_32 (output_bfd, relocation,
1473 sgot->contents + off);
1474 h->got.offset |= 1;
1477 else
1478 unresolved_reloc = FALSE;
1480 else
1482 BFD_ASSERT (local_got_offsets != NULL
1483 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1485 off = local_got_offsets[r_symndx];
1487 /* The offset must always be a multiple of 4. We use
1488 the least significant bit to record whether we have
1489 already generated the necessary reloc. */
1490 if ((off & 1) != 0)
1491 off &= ~1;
1492 else
1494 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1496 if (info->shared)
1498 asection *s;
1499 Elf_Internal_Rela outrel;
1500 bfd_byte *loc;
1502 s = bfd_get_section_by_name (dynobj, ".rela.got");
1503 BFD_ASSERT (s != NULL);
1505 outrel.r_offset = (sgot->output_section->vma
1506 + sgot->output_offset
1507 + off);
1508 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1509 outrel.r_addend = relocation;
1510 loc = s->contents;
1511 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1512 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1515 local_got_offsets[r_symndx] |= 1;
1519 relocation = sgot->output_offset + off;
1520 if (r_type == R_68K_GOT8O
1521 || r_type == R_68K_GOT16O
1522 || r_type == R_68K_GOT32O)
1524 /* This relocation does not use the addend. */
1525 rel->r_addend = 0;
1527 else
1528 relocation += sgot->output_section->vma;
1530 break;
1532 case R_68K_PLT8:
1533 case R_68K_PLT16:
1534 case R_68K_PLT32:
1535 /* Relocation is to the entry for this symbol in the
1536 procedure linkage table. */
1538 /* Resolve a PLTxx reloc against a local symbol directly,
1539 without using the procedure linkage table. */
1540 if (h == NULL)
1541 break;
1543 if (h->plt.offset == (bfd_vma) -1
1544 || !elf_hash_table (info)->dynamic_sections_created)
1546 /* We didn't make a PLT entry for this symbol. This
1547 happens when statically linking PIC code, or when
1548 using -Bsymbolic. */
1549 break;
1552 if (splt == NULL)
1554 splt = bfd_get_section_by_name (dynobj, ".plt");
1555 BFD_ASSERT (splt != NULL);
1558 relocation = (splt->output_section->vma
1559 + splt->output_offset
1560 + h->plt.offset);
1561 unresolved_reloc = FALSE;
1562 break;
1564 case R_68K_PLT8O:
1565 case R_68K_PLT16O:
1566 case R_68K_PLT32O:
1567 /* Relocation is the offset of the entry for this symbol in
1568 the procedure linkage table. */
1569 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1571 if (splt == NULL)
1573 splt = bfd_get_section_by_name (dynobj, ".plt");
1574 BFD_ASSERT (splt != NULL);
1577 relocation = h->plt.offset;
1578 unresolved_reloc = FALSE;
1580 /* This relocation does not use the addend. */
1581 rel->r_addend = 0;
1583 break;
1585 case R_68K_PC8:
1586 case R_68K_PC16:
1587 case R_68K_PC32:
1588 if (h == NULL
1589 || (info->shared
1590 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1591 break;
1592 /* Fall through. */
1593 case R_68K_8:
1594 case R_68K_16:
1595 case R_68K_32:
1596 if (info->shared
1597 && r_symndx != 0
1598 && (input_section->flags & SEC_ALLOC) != 0
1599 && (h == NULL
1600 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1601 || h->root.type != bfd_link_hash_undefweak)
1602 && ((r_type != R_68K_PC8
1603 && r_type != R_68K_PC16
1604 && r_type != R_68K_PC32)
1605 || (h != NULL
1606 && h->dynindx != -1
1607 && (!info->symbolic
1608 || (h->elf_link_hash_flags
1609 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1611 Elf_Internal_Rela outrel;
1612 bfd_byte *loc;
1613 bfd_boolean skip, relocate;
1615 /* When generating a shared object, these relocations
1616 are copied into the output file to be resolved at run
1617 time. */
1619 skip = FALSE;
1620 relocate = FALSE;
1622 outrel.r_offset =
1623 _bfd_elf_section_offset (output_bfd, info, input_section,
1624 rel->r_offset);
1625 if (outrel.r_offset == (bfd_vma) -1)
1626 skip = TRUE;
1627 else if (outrel.r_offset == (bfd_vma) -2)
1628 skip = TRUE, relocate = TRUE;
1629 outrel.r_offset += (input_section->output_section->vma
1630 + input_section->output_offset);
1632 if (skip)
1633 memset (&outrel, 0, sizeof outrel);
1634 else if (h != NULL
1635 && h->dynindx != -1
1636 && (r_type == R_68K_PC8
1637 || r_type == R_68K_PC16
1638 || r_type == R_68K_PC32
1639 || !info->shared
1640 || !info->symbolic
1641 || (h->elf_link_hash_flags
1642 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1644 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1645 outrel.r_addend = rel->r_addend;
1647 else
1649 /* This symbol is local, or marked to become local. */
1650 if (r_type == R_68K_32)
1652 relocate = TRUE;
1653 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1654 outrel.r_addend = relocation + rel->r_addend;
1656 else
1658 long indx;
1660 if (bfd_is_abs_section (sec))
1661 indx = 0;
1662 else if (sec == NULL || sec->owner == NULL)
1664 bfd_set_error (bfd_error_bad_value);
1665 return FALSE;
1667 else
1669 asection *osec;
1671 osec = sec->output_section;
1672 indx = elf_section_data (osec)->dynindx;
1673 BFD_ASSERT (indx > 0);
1676 outrel.r_info = ELF32_R_INFO (indx, r_type);
1677 outrel.r_addend = relocation + rel->r_addend;
1681 sreloc = elf_section_data (input_section)->sreloc;
1682 if (sreloc == NULL)
1683 abort ();
1685 loc = sreloc->contents;
1686 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1687 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1689 /* This reloc will be computed at runtime, so there's no
1690 need to do anything now, except for R_68K_32
1691 relocations that have been turned into
1692 R_68K_RELATIVE. */
1693 if (!relocate)
1694 continue;
1697 break;
1699 case R_68K_GNU_VTINHERIT:
1700 case R_68K_GNU_VTENTRY:
1701 /* These are no-ops in the end. */
1702 continue;
1704 default:
1705 break;
1708 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1709 because such sections are not SEC_ALLOC and thus ld.so will
1710 not process them. */
1711 if (unresolved_reloc
1712 && !((input_section->flags & SEC_DEBUGGING) != 0
1713 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1715 (*_bfd_error_handler)
1716 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
1717 bfd_archive_filename (input_bfd),
1718 bfd_get_section_name (input_bfd, input_section),
1719 (long) rel->r_offset,
1720 h->root.root.string);
1721 return FALSE;
1724 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1725 contents, rel->r_offset,
1726 relocation, rel->r_addend);
1728 if (r != bfd_reloc_ok)
1730 const char *name;
1732 if (h != NULL)
1733 name = h->root.root.string;
1734 else
1736 name = bfd_elf_string_from_elf_section (input_bfd,
1737 symtab_hdr->sh_link,
1738 sym->st_name);
1739 if (name == NULL)
1740 return FALSE;
1741 if (*name == '\0')
1742 name = bfd_section_name (input_bfd, sec);
1745 if (r == bfd_reloc_overflow)
1747 if (!(info->callbacks->reloc_overflow
1748 (info, name, howto->name, (bfd_vma) 0,
1749 input_bfd, input_section, rel->r_offset)))
1750 return FALSE;
1752 else
1754 (*_bfd_error_handler)
1755 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
1756 bfd_archive_filename (input_bfd),
1757 bfd_get_section_name (input_bfd, input_section),
1758 (long) rel->r_offset, name, (int) r);
1759 return FALSE;
1764 return TRUE;
1767 /* Finish up dynamic symbol handling. We set the contents of various
1768 dynamic sections here. */
1770 static bfd_boolean
1771 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1772 bfd *output_bfd;
1773 struct bfd_link_info *info;
1774 struct elf_link_hash_entry *h;
1775 Elf_Internal_Sym *sym;
1777 bfd *dynobj;
1778 int plt_off1, plt_off2, plt_off3;
1780 dynobj = elf_hash_table (info)->dynobj;
1782 if (h->plt.offset != (bfd_vma) -1)
1784 asection *splt;
1785 asection *sgot;
1786 asection *srela;
1787 bfd_vma plt_index;
1788 bfd_vma got_offset;
1789 Elf_Internal_Rela rela;
1790 bfd_byte *loc;
1792 /* This symbol has an entry in the procedure linkage table. Set
1793 it up. */
1795 BFD_ASSERT (h->dynindx != -1);
1797 splt = bfd_get_section_by_name (dynobj, ".plt");
1798 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1799 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1800 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1802 /* Get the index in the procedure linkage table which
1803 corresponds to this symbol. This is the index of this symbol
1804 in all the symbols for which we are making plt entries. The
1805 first entry in the procedure linkage table is reserved. */
1806 if ( CPU32_FLAG (output_bfd))
1807 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1808 else
1809 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1811 /* Get the offset into the .got table of the entry that
1812 corresponds to this function. Each .got entry is 4 bytes.
1813 The first three are reserved. */
1814 got_offset = (plt_index + 3) * 4;
1816 if ( CPU32_FLAG (output_bfd))
1818 /* Fill in the entry in the procedure linkage table. */
1819 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1820 PLT_CPU32_ENTRY_SIZE);
1821 plt_off1 = 4;
1822 plt_off2 = 12;
1823 plt_off3 = 18;
1825 else
1827 /* Fill in the entry in the procedure linkage table. */
1828 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1829 PLT_ENTRY_SIZE);
1830 plt_off1 = 4;
1831 plt_off2 = 10;
1832 plt_off3 = 16;
1835 /* The offset is relative to the first extension word. */
1836 bfd_put_32 (output_bfd,
1837 (sgot->output_section->vma
1838 + sgot->output_offset
1839 + got_offset
1840 - (splt->output_section->vma
1841 + h->plt.offset + 2)),
1842 splt->contents + h->plt.offset + plt_off1);
1844 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1845 splt->contents + h->plt.offset + plt_off2);
1846 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1847 splt->contents + h->plt.offset + plt_off3);
1849 /* Fill in the entry in the global offset table. */
1850 bfd_put_32 (output_bfd,
1851 (splt->output_section->vma
1852 + splt->output_offset
1853 + h->plt.offset
1854 + 8),
1855 sgot->contents + got_offset);
1857 /* Fill in the entry in the .rela.plt section. */
1858 rela.r_offset = (sgot->output_section->vma
1859 + sgot->output_offset
1860 + got_offset);
1861 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1862 rela.r_addend = 0;
1863 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1864 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1866 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1868 /* Mark the symbol as undefined, rather than as defined in
1869 the .plt section. Leave the value alone. */
1870 sym->st_shndx = SHN_UNDEF;
1874 if (h->got.offset != (bfd_vma) -1)
1876 asection *sgot;
1877 asection *srela;
1878 Elf_Internal_Rela rela;
1879 bfd_byte *loc;
1881 /* This symbol has an entry in the global offset table. Set it
1882 up. */
1884 sgot = bfd_get_section_by_name (dynobj, ".got");
1885 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1886 BFD_ASSERT (sgot != NULL && srela != NULL);
1888 rela.r_offset = (sgot->output_section->vma
1889 + sgot->output_offset
1890 + (h->got.offset &~ (bfd_vma) 1));
1892 /* If this is a -Bsymbolic link, and the symbol is defined
1893 locally, we just want to emit a RELATIVE reloc. Likewise if
1894 the symbol was forced to be local because of a version file.
1895 The entry in the global offset table will already have been
1896 initialized in the relocate_section function. */
1897 if (info->shared
1898 && (info->symbolic
1899 || h->dynindx == -1
1900 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
1901 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1903 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1904 rela.r_addend = bfd_get_signed_32 (output_bfd,
1905 (sgot->contents
1906 + (h->got.offset &~ (bfd_vma) 1)));
1908 else
1910 bfd_put_32 (output_bfd, (bfd_vma) 0,
1911 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1912 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1913 rela.r_addend = 0;
1916 loc = srela->contents;
1917 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1918 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1921 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1923 asection *s;
1924 Elf_Internal_Rela rela;
1925 bfd_byte *loc;
1927 /* This symbol needs a copy reloc. Set it up. */
1929 BFD_ASSERT (h->dynindx != -1
1930 && (h->root.type == bfd_link_hash_defined
1931 || h->root.type == bfd_link_hash_defweak));
1933 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1934 ".rela.bss");
1935 BFD_ASSERT (s != NULL);
1937 rela.r_offset = (h->root.u.def.value
1938 + h->root.u.def.section->output_section->vma
1939 + h->root.u.def.section->output_offset);
1940 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1941 rela.r_addend = 0;
1942 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1943 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1946 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1947 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1948 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1949 sym->st_shndx = SHN_ABS;
1951 return TRUE;
1954 /* Finish up the dynamic sections. */
1956 static bfd_boolean
1957 elf_m68k_finish_dynamic_sections (output_bfd, info)
1958 bfd *output_bfd;
1959 struct bfd_link_info *info;
1961 bfd *dynobj;
1962 asection *sgot;
1963 asection *sdyn;
1965 dynobj = elf_hash_table (info)->dynobj;
1967 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1968 BFD_ASSERT (sgot != NULL);
1969 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1971 if (elf_hash_table (info)->dynamic_sections_created)
1973 asection *splt;
1974 Elf32_External_Dyn *dyncon, *dynconend;
1976 splt = bfd_get_section_by_name (dynobj, ".plt");
1977 BFD_ASSERT (splt != NULL && sdyn != NULL);
1979 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1980 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1981 for (; dyncon < dynconend; dyncon++)
1983 Elf_Internal_Dyn dyn;
1984 const char *name;
1985 asection *s;
1987 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1989 switch (dyn.d_tag)
1991 default:
1992 break;
1994 case DT_PLTGOT:
1995 name = ".got";
1996 goto get_vma;
1997 case DT_JMPREL:
1998 name = ".rela.plt";
1999 get_vma:
2000 s = bfd_get_section_by_name (output_bfd, name);
2001 BFD_ASSERT (s != NULL);
2002 dyn.d_un.d_ptr = s->vma;
2003 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2004 break;
2006 case DT_PLTRELSZ:
2007 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2008 BFD_ASSERT (s != NULL);
2009 if (s->_cooked_size != 0)
2010 dyn.d_un.d_val = s->_cooked_size;
2011 else
2012 dyn.d_un.d_val = s->_raw_size;
2013 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2014 break;
2016 case DT_RELASZ:
2017 /* The procedure linkage table relocs (DT_JMPREL) should
2018 not be included in the overall relocs (DT_RELA).
2019 Therefore, we override the DT_RELASZ entry here to
2020 make it not include the JMPREL relocs. Since the
2021 linker script arranges for .rela.plt to follow all
2022 other relocation sections, we don't have to worry
2023 about changing the DT_RELA entry. */
2024 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2025 if (s != NULL)
2027 if (s->_cooked_size != 0)
2028 dyn.d_un.d_val -= s->_cooked_size;
2029 else
2030 dyn.d_un.d_val -= s->_raw_size;
2032 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2033 break;
2037 /* Fill in the first entry in the procedure linkage table. */
2038 if (splt->_raw_size > 0)
2040 if (!CPU32_FLAG (output_bfd))
2042 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2043 bfd_put_32 (output_bfd,
2044 (sgot->output_section->vma
2045 + sgot->output_offset + 4
2046 - (splt->output_section->vma + 2)),
2047 splt->contents + 4);
2048 bfd_put_32 (output_bfd,
2049 (sgot->output_section->vma
2050 + sgot->output_offset + 8
2051 - (splt->output_section->vma + 10)),
2052 splt->contents + 12);
2053 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2054 = PLT_ENTRY_SIZE;
2056 else /* cpu32 */
2058 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2059 bfd_put_32 (output_bfd,
2060 (sgot->output_section->vma
2061 + sgot->output_offset + 4
2062 - (splt->output_section->vma + 2)),
2063 splt->contents + 4);
2064 bfd_put_32 (output_bfd,
2065 (sgot->output_section->vma
2066 + sgot->output_offset + 8
2067 - (splt->output_section->vma + 10)),
2068 splt->contents + 12);
2069 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2070 = PLT_CPU32_ENTRY_SIZE;
2075 /* Fill in the first three entries in the global offset table. */
2076 if (sgot->_raw_size > 0)
2078 if (sdyn == NULL)
2079 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2080 else
2081 bfd_put_32 (output_bfd,
2082 sdyn->output_section->vma + sdyn->output_offset,
2083 sgot->contents);
2084 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2085 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2088 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2090 return TRUE;
2093 /* Given a .data section and a .emreloc in-memory section, store
2094 relocation information into the .emreloc section which can be
2095 used at runtime to relocate the section. This is called by the
2096 linker when the --embedded-relocs switch is used. This is called
2097 after the add_symbols entry point has been called for all the
2098 objects, and before the final_link entry point is called. */
2100 bfd_boolean
2101 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2102 bfd *abfd;
2103 struct bfd_link_info *info;
2104 asection *datasec;
2105 asection *relsec;
2106 char **errmsg;
2108 Elf_Internal_Shdr *symtab_hdr;
2109 Elf_Internal_Sym *isymbuf = NULL;
2110 Elf_Internal_Rela *internal_relocs = NULL;
2111 Elf_Internal_Rela *irel, *irelend;
2112 bfd_byte *p;
2113 bfd_size_type amt;
2115 BFD_ASSERT (! info->relocatable);
2117 *errmsg = NULL;
2119 if (datasec->reloc_count == 0)
2120 return TRUE;
2122 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2124 /* Get a copy of the native relocations. */
2125 internal_relocs = (_bfd_elf_link_read_relocs
2126 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2127 info->keep_memory));
2128 if (internal_relocs == NULL)
2129 goto error_return;
2131 amt = (bfd_size_type) datasec->reloc_count * 12;
2132 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2133 if (relsec->contents == NULL)
2134 goto error_return;
2136 p = relsec->contents;
2138 irelend = internal_relocs + datasec->reloc_count;
2139 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2141 asection *targetsec;
2143 /* We are going to write a four byte longword into the runtime
2144 reloc section. The longword will be the address in the data
2145 section which must be relocated. It is followed by the name
2146 of the target section NUL-padded or truncated to 8
2147 characters. */
2149 /* We can only relocate absolute longword relocs at run time. */
2150 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2152 *errmsg = _("unsupported reloc type");
2153 bfd_set_error (bfd_error_bad_value);
2154 goto error_return;
2157 /* Get the target section referred to by the reloc. */
2158 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2160 /* A local symbol. */
2161 Elf_Internal_Sym *isym;
2163 /* Read this BFD's local symbols if we haven't done so already. */
2164 if (isymbuf == NULL)
2166 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2167 if (isymbuf == NULL)
2168 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2169 symtab_hdr->sh_info, 0,
2170 NULL, NULL, NULL);
2171 if (isymbuf == NULL)
2172 goto error_return;
2175 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2176 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2178 else
2180 unsigned long indx;
2181 struct elf_link_hash_entry *h;
2183 /* An external symbol. */
2184 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2185 h = elf_sym_hashes (abfd)[indx];
2186 BFD_ASSERT (h != NULL);
2187 if (h->root.type == bfd_link_hash_defined
2188 || h->root.type == bfd_link_hash_defweak)
2189 targetsec = h->root.u.def.section;
2190 else
2191 targetsec = NULL;
2194 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2195 memset (p + 4, 0, 8);
2196 if (targetsec != NULL)
2197 strncpy (p + 4, targetsec->output_section->name, 8);
2200 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2201 free (isymbuf);
2202 if (internal_relocs != NULL
2203 && elf_section_data (datasec)->relocs != internal_relocs)
2204 free (internal_relocs);
2205 return TRUE;
2207 error_return:
2208 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2209 free (isymbuf);
2210 if (internal_relocs != NULL
2211 && elf_section_data (datasec)->relocs != internal_relocs)
2212 free (internal_relocs);
2213 return FALSE;
2216 static enum elf_reloc_type_class
2217 elf32_m68k_reloc_type_class (rela)
2218 const Elf_Internal_Rela *rela;
2220 switch ((int) ELF32_R_TYPE (rela->r_info))
2222 case R_68K_RELATIVE:
2223 return reloc_class_relative;
2224 case R_68K_JMP_SLOT:
2225 return reloc_class_plt;
2226 case R_68K_COPY:
2227 return reloc_class_copy;
2228 default:
2229 return reloc_class_normal;
2233 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2234 #define TARGET_BIG_NAME "elf32-m68k"
2235 #define ELF_MACHINE_CODE EM_68K
2236 #define ELF_MAXPAGESIZE 0x2000
2237 #define elf_backend_create_dynamic_sections \
2238 _bfd_elf_create_dynamic_sections
2239 #define bfd_elf32_bfd_link_hash_table_create \
2240 elf_m68k_link_hash_table_create
2241 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2243 #define elf_backend_check_relocs elf_m68k_check_relocs
2244 #define elf_backend_adjust_dynamic_symbol \
2245 elf_m68k_adjust_dynamic_symbol
2246 #define elf_backend_size_dynamic_sections \
2247 elf_m68k_size_dynamic_sections
2248 #define elf_backend_relocate_section elf_m68k_relocate_section
2249 #define elf_backend_finish_dynamic_symbol \
2250 elf_m68k_finish_dynamic_symbol
2251 #define elf_backend_finish_dynamic_sections \
2252 elf_m68k_finish_dynamic_sections
2253 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2254 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2255 #define bfd_elf32_bfd_merge_private_bfd_data \
2256 elf32_m68k_merge_private_bfd_data
2257 #define bfd_elf32_bfd_set_private_flags \
2258 elf32_m68k_set_private_flags
2259 #define bfd_elf32_bfd_print_private_bfd_data \
2260 elf32_m68k_print_private_bfd_data
2261 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2263 #define elf_backend_can_gc_sections 1
2264 #define elf_backend_can_refcount 1
2265 #define elf_backend_want_got_plt 1
2266 #define elf_backend_plt_readonly 1
2267 #define elf_backend_want_plt_sym 0
2268 #define elf_backend_got_header_size 12
2269 #define elf_backend_rela_normal 1
2271 #include "elf32-target.h"