1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 2004, 2005 Free Software Foundation, Inc.
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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
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
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 *,
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 */
96 2, /* size (0 = byte, 1 = short, 2 = long) */
98 FALSE, /* pc_relative */
100 complain_overflow_dont, /* complain_on_overflow */
101 NULL, /* special_function */
102 "R_68K_GNU_VTINHERIT", /* name */
103 FALSE, /* partial_inplace */
107 /* GNU extension to record C++ vtable member usage. */
108 HOWTO (R_68K_GNU_VTENTRY, /* type */
110 2, /* size (0 = byte, 1 = short, 2 = long) */
112 FALSE, /* pc_relative */
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 */
124 rtype_to_howto (abfd, cache_ptr, dst)
125 bfd *abfd ATTRIBUTE_UNUSED;
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
137 bfd_reloc_code_real_type bfd_val;
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;
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];
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
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. */
221 #define CFV4E_PLT_ENTRY_SIZE 24
223 #define CFV4E_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CFV4E)
225 static const bfd_byte elf_cfv4e_plt0_entry[CFV4E_PLT_ENTRY_SIZE] =
228 0, 0, 0, 0, /* Replaced with offset to .got + 4. */
229 0x2f, 0x3b, 0x08, 0xfa, /* move.l (%pc,addr),-(%sp) */
231 0, 0, 0, 0, /* Replaced with offset to .got + 8. */
232 0x20, 0x7b, 0x08, 0x00, /* move.l (%pc,%d0:l), %a0 */
233 0x4e, 0xd0, /* jmp (%a0) */
237 /* Subsequent entries in a procedure linkage table look like this. */
239 static const bfd_byte elf_cfv4e_plt_entry[CFV4E_PLT_ENTRY_SIZE] =
242 0, 0, 0, 0, /* Replaced with offset to symbol's .got entry. */
243 0x20, 0x7b, 0x08, 0x00, /* move.l (%pc,%d0:l), %a0 */
244 0x4e, 0xd0, /* jmp (%a0) */
245 0x2f, 0x3c, /* move.l #offset,-(%sp) */
246 0, 0, 0, 0, /* Replaced with offset into relocation table. */
247 0x60, 0xff, /* bra.l .plt */
248 0, 0, 0, 0 /* Replaced with offset to start of .plt. */
251 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
253 #define PLT_CPU32_ENTRY_SIZE 24
254 /* Procedure linkage table entries for the cpu32 */
255 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
257 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
258 0, 0, 0, 0, /* replaced with offset to .got + 4. */
259 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
260 0, 0, 0, 0, /* replace with offset to .got +8. */
261 0x4e, 0xd1, /* jmp %a1@ */
262 0, 0, 0, 0, /* pad out to 24 bytes. */
266 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
268 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
269 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
270 0x4e, 0xd1, /* jmp %a1@ */
271 0x2f, 0x3c, /* move.l #offset,-(%sp) */
272 0, 0, 0, 0, /* replaced with offset into relocation table. */
273 0x60, 0xff, /* bra.l .plt */
274 0, 0, 0, 0, /* replaced with offset to start of .plt. */
278 /* The m68k linker needs to keep track of the number of relocs that it
279 decides to copy in check_relocs for each symbol. This is so that it
280 can discard PC relative relocs if it doesn't need them when linking
281 with -Bsymbolic. We store the information in a field extending the
282 regular ELF linker hash table. */
284 /* This structure keeps track of the number of PC relative relocs we have
285 copied for a given symbol. */
287 struct elf_m68k_pcrel_relocs_copied
290 struct elf_m68k_pcrel_relocs_copied *next;
291 /* A section in dynobj. */
293 /* Number of relocs copied in this section. */
297 /* m68k ELF linker hash entry. */
299 struct elf_m68k_link_hash_entry
301 struct elf_link_hash_entry root;
303 /* Number of PC relative relocs copied for this symbol. */
304 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
307 #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent))
309 /* m68k ELF linker hash table. */
311 struct elf_m68k_link_hash_table
313 struct elf_link_hash_table root;
315 /* Small local sym to section mapping cache. */
316 struct sym_sec_cache sym_sec;
319 /* Get the m68k ELF linker hash table from a link_info structure. */
321 #define elf_m68k_hash_table(p) \
322 ((struct elf_m68k_link_hash_table *) (p)->hash)
324 /* Create an entry in an m68k ELF linker hash table. */
326 static struct bfd_hash_entry *
327 elf_m68k_link_hash_newfunc (entry, table, string)
328 struct bfd_hash_entry *entry;
329 struct bfd_hash_table *table;
332 struct bfd_hash_entry *ret = entry;
334 /* Allocate the structure if it has not already been allocated by a
337 ret = bfd_hash_allocate (table,
338 sizeof (struct elf_m68k_link_hash_entry));
342 /* Call the allocation method of the superclass. */
343 ret = _bfd_elf_link_hash_newfunc (ret, table, string);
345 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL;
350 /* Create an m68k ELF linker hash table. */
352 static struct bfd_link_hash_table *
353 elf_m68k_link_hash_table_create (abfd)
356 struct elf_m68k_link_hash_table *ret;
357 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table);
359 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt);
360 if (ret == (struct elf_m68k_link_hash_table *) NULL)
363 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
364 elf_m68k_link_hash_newfunc))
370 ret->sym_sec.abfd = NULL;
372 return &ret->root.root;
375 /* Keep m68k-specific flags in the ELF header. */
377 elf32_m68k_set_private_flags (abfd, flags)
381 elf_elfheader (abfd)->e_flags = flags;
382 elf_flags_init (abfd) = TRUE;
386 /* Merge backend specific data from an object file to the output
387 object file when linking. */
389 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
396 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
397 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
400 in_flags = elf_elfheader (ibfd)->e_flags;
401 out_flags = elf_elfheader (obfd)->e_flags;
403 if (!elf_flags_init (obfd))
405 elf_flags_init (obfd) = TRUE;
406 elf_elfheader (obfd)->e_flags = in_flags;
412 /* Display the flags field. */
414 elf32_m68k_print_private_bfd_data (abfd, ptr)
418 FILE *file = (FILE *) ptr;
420 BFD_ASSERT (abfd != NULL && ptr != NULL);
422 /* Print normal ELF private data. */
423 _bfd_elf_print_private_bfd_data (abfd, ptr);
425 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
427 /* xgettext:c-format */
428 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
430 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
431 fprintf (file, _(" [cpu32]"));
433 if (elf_elfheader (abfd)->e_flags & EF_M68000)
434 fprintf (file, _(" [m68000]"));
440 /* Look through the relocs for a section during the first phase, and
441 allocate space in the global offset table or procedure linkage
445 elf_m68k_check_relocs (abfd, info, sec, relocs)
447 struct bfd_link_info *info;
449 const Elf_Internal_Rela *relocs;
452 Elf_Internal_Shdr *symtab_hdr;
453 struct elf_link_hash_entry **sym_hashes;
454 bfd_signed_vma *local_got_refcounts;
455 const Elf_Internal_Rela *rel;
456 const Elf_Internal_Rela *rel_end;
461 if (info->relocatable)
464 dynobj = elf_hash_table (info)->dynobj;
465 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
466 sym_hashes = elf_sym_hashes (abfd);
467 local_got_refcounts = elf_local_got_refcounts (abfd);
473 rel_end = relocs + sec->reloc_count;
474 for (rel = relocs; rel < rel_end; rel++)
476 unsigned long r_symndx;
477 struct elf_link_hash_entry *h;
479 r_symndx = ELF32_R_SYM (rel->r_info);
481 if (r_symndx < symtab_hdr->sh_info)
485 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
486 while (h->root.type == bfd_link_hash_indirect
487 || h->root.type == bfd_link_hash_warning)
488 h = (struct elf_link_hash_entry *) h->root.u.i.link;
491 switch (ELF32_R_TYPE (rel->r_info))
497 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
503 /* This symbol requires a global offset table entry. */
507 /* Create the .got section. */
508 elf_hash_table (info)->dynobj = dynobj = abfd;
509 if (!_bfd_elf_create_got_section (dynobj, info))
515 sgot = bfd_get_section_by_name (dynobj, ".got");
516 BFD_ASSERT (sgot != NULL);
520 && (h != NULL || info->shared))
522 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
525 srelgot = bfd_make_section_with_flags (dynobj,
534 || !bfd_set_section_alignment (dynobj, srelgot, 2))
541 if (h->got.refcount == 0)
543 /* Make sure this symbol is output as a dynamic symbol. */
547 if (!bfd_elf_link_record_dynamic_symbol (info, h))
551 /* Allocate space in the .got section. */
553 /* Allocate relocation space. */
554 srelgot->size += sizeof (Elf32_External_Rela);
560 /* This is a global offset table entry for a local symbol. */
561 if (local_got_refcounts == NULL)
565 size = symtab_hdr->sh_info;
566 size *= sizeof (bfd_signed_vma);
567 local_got_refcounts = ((bfd_signed_vma *)
568 bfd_zalloc (abfd, size));
569 if (local_got_refcounts == NULL)
571 elf_local_got_refcounts (abfd) = local_got_refcounts;
573 if (local_got_refcounts[r_symndx] == 0)
578 /* If we are generating a shared object, we need to
579 output a R_68K_RELATIVE reloc so that the dynamic
580 linker can adjust this GOT entry. */
581 srelgot->size += sizeof (Elf32_External_Rela);
584 local_got_refcounts[r_symndx]++;
591 /* This symbol requires a procedure linkage table entry. We
592 actually build the entry in adjust_dynamic_symbol,
593 because this might be a case of linking PIC code which is
594 never referenced by a dynamic object, in which case we
595 don't need to generate a procedure linkage table entry
598 /* If this is a local symbol, we resolve it directly without
599 creating a procedure linkage table entry. */
610 /* This symbol requires a procedure linkage table entry. */
614 /* It does not make sense to have this relocation for a
615 local symbol. FIXME: does it? How to handle it if
616 it does make sense? */
617 bfd_set_error (bfd_error_bad_value);
621 /* Make sure this symbol is output as a dynamic symbol. */
625 if (!bfd_elf_link_record_dynamic_symbol (info, h))
636 /* If we are creating a shared library and this is not a local
637 symbol, we need to copy the reloc into the shared library.
638 However when linking with -Bsymbolic and this is a global
639 symbol which is defined in an object we are including in the
640 link (i.e., DEF_REGULAR is set), then we can resolve the
641 reloc directly. At this point we have not seen all the input
642 files, so it is possible that DEF_REGULAR is not set now but
643 will be set later (it is never cleared). We account for that
644 possibility below by storing information in the
645 pcrel_relocs_copied field of the hash table entry. */
647 && (sec->flags & SEC_ALLOC) != 0
650 || h->root.type == bfd_link_hash_defweak
651 || !h->def_regular)))
655 /* Make sure a plt entry is created for this symbol if
656 it turns out to be a function defined by a dynamic
668 /* Make sure a plt entry is created for this symbol if it
669 turns out to be a function defined by a dynamic object. */
673 /* If we are creating a shared library, we need to copy the
674 reloc into the shared library. */
676 && (sec->flags & SEC_ALLOC) != 0)
678 /* When creating a shared object, we must copy these
679 reloc types into the output file. We create a reloc
680 section in dynobj and make room for this reloc. */
685 name = (bfd_elf_string_from_elf_section
687 elf_elfheader (abfd)->e_shstrndx,
688 elf_section_data (sec)->rel_hdr.sh_name));
692 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
693 && strcmp (bfd_get_section_name (abfd, sec),
696 sreloc = bfd_get_section_by_name (dynobj, name);
699 sreloc = bfd_make_section_with_flags (dynobj,
708 || !bfd_set_section_alignment (dynobj, sreloc, 2))
711 elf_section_data (sec)->sreloc = sreloc;
714 if (sec->flags & SEC_READONLY
715 /* Don't set DF_TEXTREL yet for PC relative
716 relocations, they might be discarded later. */
717 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8
718 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
719 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32))
720 info->flags |= DF_TEXTREL;
722 sreloc->size += sizeof (Elf32_External_Rela);
724 /* We count the number of PC relative relocations we have
725 entered for this symbol, so that we can discard them
726 again if, in the -Bsymbolic case, the symbol is later
727 defined by a regular object, or, in the normal shared
728 case, the symbol is forced to be local. Note that this
729 function is only called if we are using an m68kelf linker
730 hash table, which means that h is really a pointer to an
731 elf_m68k_link_hash_entry. */
732 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8
733 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
734 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
736 struct elf_m68k_pcrel_relocs_copied *p;
737 struct elf_m68k_pcrel_relocs_copied **head;
741 struct elf_m68k_link_hash_entry *eh
742 = elf_m68k_hash_entry (h);
743 head = &eh->pcrel_relocs_copied;
748 s = (bfd_section_from_r_symndx
749 (abfd, &elf_m68k_hash_table (info)->sym_sec,
754 head = ((struct elf_m68k_pcrel_relocs_copied **)
755 &elf_section_data (s)->local_dynrel);
758 for (p = *head; p != NULL; p = p->next)
759 if (p->section == sreloc)
764 p = ((struct elf_m68k_pcrel_relocs_copied *)
765 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
780 /* This relocation describes the C++ object vtable hierarchy.
781 Reconstruct it for later use during GC. */
782 case R_68K_GNU_VTINHERIT:
783 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
787 /* This relocation describes which C++ vtable entries are actually
788 used. Record for later use during GC. */
789 case R_68K_GNU_VTENTRY:
790 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
802 /* Return the section that should be marked against GC for a given
806 elf_m68k_gc_mark_hook (sec, info, rel, h, sym)
808 struct bfd_link_info *info ATTRIBUTE_UNUSED;
809 Elf_Internal_Rela *rel;
810 struct elf_link_hash_entry *h;
811 Elf_Internal_Sym *sym;
815 switch (ELF32_R_TYPE (rel->r_info))
817 case R_68K_GNU_VTINHERIT:
818 case R_68K_GNU_VTENTRY:
822 switch (h->root.type)
827 case bfd_link_hash_defined:
828 case bfd_link_hash_defweak:
829 return h->root.u.def.section;
831 case bfd_link_hash_common:
832 return h->root.u.c.p->section;
837 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
842 /* Update the got entry reference counts for the section being removed. */
845 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
847 struct bfd_link_info *info;
849 const Elf_Internal_Rela *relocs;
851 Elf_Internal_Shdr *symtab_hdr;
852 struct elf_link_hash_entry **sym_hashes;
853 bfd_signed_vma *local_got_refcounts;
854 const Elf_Internal_Rela *rel, *relend;
859 dynobj = elf_hash_table (info)->dynobj;
863 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
864 sym_hashes = elf_sym_hashes (abfd);
865 local_got_refcounts = elf_local_got_refcounts (abfd);
867 sgot = bfd_get_section_by_name (dynobj, ".got");
868 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
870 relend = relocs + sec->reloc_count;
871 for (rel = relocs; rel < relend; rel++)
873 unsigned long r_symndx;
874 struct elf_link_hash_entry *h = NULL;
876 r_symndx = ELF32_R_SYM (rel->r_info);
877 if (r_symndx >= symtab_hdr->sh_info)
879 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
880 while (h->root.type == bfd_link_hash_indirect
881 || h->root.type == bfd_link_hash_warning)
882 h = (struct elf_link_hash_entry *) h->root.u.i.link;
885 switch (ELF32_R_TYPE (rel->r_info))
895 if (h->got.refcount > 0)
898 if (h->got.refcount == 0)
900 /* We don't need the .got entry any more. */
902 srelgot->size -= sizeof (Elf32_External_Rela);
906 else if (local_got_refcounts != NULL)
908 if (local_got_refcounts[r_symndx] > 0)
910 --local_got_refcounts[r_symndx];
911 if (local_got_refcounts[r_symndx] == 0)
913 /* We don't need the .got entry any more. */
916 srelgot->size -= sizeof (Elf32_External_Rela);
936 if (h->plt.refcount > 0)
949 /* Adjust a symbol defined by a dynamic object and referenced by a
950 regular object. The current definition is in some section of the
951 dynamic object, but we're not including those sections. We have to
952 change the definition to something the rest of the link can
956 elf_m68k_adjust_dynamic_symbol (info, h)
957 struct bfd_link_info *info;
958 struct elf_link_hash_entry *h;
962 unsigned int power_of_two;
964 dynobj = elf_hash_table (info)->dynobj;
966 /* Make sure we know what is going on here. */
967 BFD_ASSERT (dynobj != NULL
969 || h->u.weakdef != NULL
972 && !h->def_regular)));
974 /* If this is a function, put it in the procedure linkage table. We
975 will fill in the contents of the procedure linkage table later,
976 when we know the address of the .got section. */
977 if (h->type == STT_FUNC
980 if ((h->plt.refcount <= 0
981 || SYMBOL_CALLS_LOCAL (info, h)
982 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
983 && h->root.type == bfd_link_hash_undefweak))
984 /* We must always create the plt entry if it was referenced
985 by a PLTxxO relocation. In this case we already recorded
986 it as a dynamic symbol. */
989 /* This case can occur if we saw a PLTxx reloc in an input
990 file, but the symbol was never referred to by a dynamic
991 object, or if all references were garbage collected. In
992 such a case, we don't actually need to build a procedure
993 linkage table, and we can just do a PCxx reloc instead. */
994 h->plt.offset = (bfd_vma) -1;
999 /* Make sure this symbol is output as a dynamic symbol. */
1000 if (h->dynindx == -1
1001 && !h->forced_local)
1003 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1007 s = bfd_get_section_by_name (dynobj, ".plt");
1008 BFD_ASSERT (s != NULL);
1010 /* If this is the first .plt entry, make room for the special
1014 if (CPU32_FLAG (dynobj))
1015 s->size += PLT_CPU32_ENTRY_SIZE;
1016 else if (CFV4E_FLAG (dynobj))
1017 s->size += CFV4E_PLT_ENTRY_SIZE;
1019 s->size += PLT_ENTRY_SIZE;
1022 /* If this symbol is not defined in a regular file, and we are
1023 not generating a shared library, then set the symbol to this
1024 location in the .plt. This is required to make function
1025 pointers compare as equal between the normal executable and
1026 the shared library. */
1030 h->root.u.def.section = s;
1031 h->root.u.def.value = s->size;
1034 h->plt.offset = s->size;
1036 /* Make room for this entry. */
1037 if (CPU32_FLAG (dynobj))
1038 s->size += PLT_CPU32_ENTRY_SIZE;
1039 else if (CFV4E_FLAG (dynobj))
1040 s->size += CFV4E_PLT_ENTRY_SIZE;
1042 s->size += PLT_ENTRY_SIZE;
1044 /* We also need to make an entry in the .got.plt section, which
1045 will be placed in the .got section by the linker script. */
1046 s = bfd_get_section_by_name (dynobj, ".got.plt");
1047 BFD_ASSERT (s != NULL);
1050 /* We also need to make an entry in the .rela.plt section. */
1051 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1052 BFD_ASSERT (s != NULL);
1053 s->size += sizeof (Elf32_External_Rela);
1058 /* Reinitialize the plt offset now that it is not used as a reference
1060 h->plt.offset = (bfd_vma) -1;
1062 /* If this is a weak symbol, and there is a real definition, the
1063 processor independent code will have arranged for us to see the
1064 real definition first, and we can just use the same value. */
1065 if (h->u.weakdef != NULL)
1067 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1068 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1069 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1070 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1074 /* This is a reference to a symbol defined by a dynamic object which
1075 is not a function. */
1077 /* If we are creating a shared library, we must presume that the
1078 only references to the symbol are via the global offset table.
1079 For such cases we need not do anything here; the relocations will
1080 be handled correctly by relocate_section. */
1084 /* We must allocate the symbol in our .dynbss section, which will
1085 become part of the .bss section of the executable. There will be
1086 an entry for this symbol in the .dynsym section. The dynamic
1087 object will contain position independent code, so all references
1088 from the dynamic object to this symbol will go through the global
1089 offset table. The dynamic linker will use the .dynsym entry to
1090 determine the address it must put in the global offset table, so
1091 both the dynamic object and the regular object will refer to the
1092 same memory location for the variable. */
1094 s = bfd_get_section_by_name (dynobj, ".dynbss");
1095 BFD_ASSERT (s != NULL);
1097 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1098 copy the initial value out of the dynamic object and into the
1099 runtime process image. We need to remember the offset into the
1100 .rela.bss section we are going to use. */
1101 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1105 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1106 BFD_ASSERT (srel != NULL);
1107 srel->size += sizeof (Elf32_External_Rela);
1111 /* We need to figure out the alignment required for this symbol. I
1112 have no idea how ELF linkers handle this. */
1113 power_of_two = bfd_log2 (h->size);
1114 if (power_of_two > 3)
1117 /* Apply the required alignment. */
1118 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1119 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1121 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1125 /* Define the symbol as being at this point in the section. */
1126 h->root.u.def.section = s;
1127 h->root.u.def.value = s->size;
1129 /* Increment the section size to make room for the symbol. */
1135 /* Set the sizes of the dynamic sections. */
1138 elf_m68k_size_dynamic_sections (output_bfd, info)
1139 bfd *output_bfd ATTRIBUTE_UNUSED;
1140 struct bfd_link_info *info;
1147 dynobj = elf_hash_table (info)->dynobj;
1148 BFD_ASSERT (dynobj != NULL);
1150 if (elf_hash_table (info)->dynamic_sections_created)
1152 /* Set the contents of the .interp section to the interpreter. */
1153 if (info->executable)
1155 s = bfd_get_section_by_name (dynobj, ".interp");
1156 BFD_ASSERT (s != NULL);
1157 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1158 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1163 /* We may have created entries in the .rela.got section.
1164 However, if we are not creating the dynamic sections, we will
1165 not actually use these entries. Reset the size of .rela.got,
1166 which will cause it to get stripped from the output file
1168 s = bfd_get_section_by_name (dynobj, ".rela.got");
1173 /* If this is a -Bsymbolic shared link, then we need to discard all
1174 PC relative relocs against symbols defined in a regular object.
1175 For the normal shared case we discard the PC relative relocs
1176 against symbols that have become local due to visibility changes.
1177 We allocated space for them in the check_relocs routine, but we
1178 will not fill them in in the relocate_section routine. */
1180 elf_link_hash_traverse (elf_hash_table (info),
1181 elf_m68k_discard_copies,
1184 /* The check_relocs and adjust_dynamic_symbol entry points have
1185 determined the sizes of the various dynamic sections. Allocate
1189 for (s = dynobj->sections; s != NULL; s = s->next)
1194 if ((s->flags & SEC_LINKER_CREATED) == 0)
1197 /* It's OK to base decisions on the section name, because none
1198 of the dynobj section names depend upon the input files. */
1199 name = bfd_get_section_name (dynobj, s);
1203 if (strcmp (name, ".plt") == 0)
1207 /* Strip this section if we don't need it; see the
1213 /* Remember whether there is a PLT. */
1217 else if (strncmp (name, ".rela", 5) == 0)
1221 /* If we don't need this section, strip it from the
1222 output file. This is mostly to handle .rela.bss and
1223 .rela.plt. We must create both sections in
1224 create_dynamic_sections, because they must be created
1225 before the linker maps input sections to output
1226 sections. The linker does that before
1227 adjust_dynamic_symbol is called, and it is that
1228 function which decides whether anything needs to go
1229 into these sections. */
1236 /* We use the reloc_count field as a counter if we need
1237 to copy relocs into the output file. */
1241 else if (strncmp (name, ".got", 4) != 0)
1243 /* It's not one of our sections, so don't allocate space. */
1249 s->flags |= SEC_EXCLUDE;
1253 /* Allocate memory for the section contents. */
1254 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1255 Unused entries should be reclaimed before the section's contents
1256 are written out, but at the moment this does not happen. Thus in
1257 order to prevent writing out garbage, we initialise the section's
1258 contents to zero. */
1259 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1260 if (s->contents == NULL && s->size != 0)
1264 if (elf_hash_table (info)->dynamic_sections_created)
1266 /* Add some entries to the .dynamic section. We fill in the
1267 values later, in elf_m68k_finish_dynamic_sections, but we
1268 must add the entries now so that we get the correct size for
1269 the .dynamic section. The DT_DEBUG entry is filled in by the
1270 dynamic linker and used by the debugger. */
1271 #define add_dynamic_entry(TAG, VAL) \
1272 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1276 if (!add_dynamic_entry (DT_DEBUG, 0))
1282 if (!add_dynamic_entry (DT_PLTGOT, 0)
1283 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1284 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1285 || !add_dynamic_entry (DT_JMPREL, 0))
1291 if (!add_dynamic_entry (DT_RELA, 0)
1292 || !add_dynamic_entry (DT_RELASZ, 0)
1293 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1297 if ((info->flags & DF_TEXTREL) != 0)
1299 if (!add_dynamic_entry (DT_TEXTREL, 0))
1303 #undef add_dynamic_entry
1308 /* This function is called via elf_link_hash_traverse if we are
1309 creating a shared object. In the -Bsymbolic case it discards the
1310 space allocated to copy PC relative relocs against symbols which
1311 are defined in regular objects. For the normal shared case, it
1312 discards space for pc-relative relocs that have become local due to
1313 symbol visibility changes. We allocated space for them in the
1314 check_relocs routine, but we won't fill them in in the
1315 relocate_section routine.
1317 We also check whether any of the remaining relocations apply
1318 against a readonly section, and set the DF_TEXTREL flag in this
1322 elf_m68k_discard_copies (h, inf)
1323 struct elf_link_hash_entry *h;
1326 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1327 struct elf_m68k_pcrel_relocs_copied *s;
1329 if (h->root.type == bfd_link_hash_warning)
1330 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1334 && !h->forced_local))
1336 if ((info->flags & DF_TEXTREL) == 0)
1338 /* Look for relocations against read-only sections. */
1339 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1342 if ((s->section->flags & SEC_READONLY) != 0)
1344 info->flags |= DF_TEXTREL;
1352 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1355 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1360 /* Relocate an M68K ELF section. */
1363 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1364 contents, relocs, local_syms, local_sections)
1366 struct bfd_link_info *info;
1368 asection *input_section;
1370 Elf_Internal_Rela *relocs;
1371 Elf_Internal_Sym *local_syms;
1372 asection **local_sections;
1375 Elf_Internal_Shdr *symtab_hdr;
1376 struct elf_link_hash_entry **sym_hashes;
1377 bfd_vma *local_got_offsets;
1381 Elf_Internal_Rela *rel;
1382 Elf_Internal_Rela *relend;
1384 if (info->relocatable)
1387 dynobj = elf_hash_table (info)->dynobj;
1388 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1389 sym_hashes = elf_sym_hashes (input_bfd);
1390 local_got_offsets = elf_local_got_offsets (input_bfd);
1397 relend = relocs + input_section->reloc_count;
1398 for (; rel < relend; rel++)
1401 reloc_howto_type *howto;
1402 unsigned long r_symndx;
1403 struct elf_link_hash_entry *h;
1404 Elf_Internal_Sym *sym;
1407 bfd_boolean unresolved_reloc;
1408 bfd_reloc_status_type r;
1410 r_type = ELF32_R_TYPE (rel->r_info);
1411 if (r_type < 0 || r_type >= (int) R_68K_max)
1413 bfd_set_error (bfd_error_bad_value);
1416 howto = howto_table + r_type;
1418 r_symndx = ELF32_R_SYM (rel->r_info);
1423 unresolved_reloc = FALSE;
1425 if (r_symndx < symtab_hdr->sh_info)
1427 sym = local_syms + r_symndx;
1428 sec = local_sections[r_symndx];
1429 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1435 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1436 r_symndx, symtab_hdr, sym_hashes,
1438 unresolved_reloc, warned);
1446 /* Relocation is to the address of the entry for this symbol
1447 in the global offset table. */
1449 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1455 /* Relocation is the offset of the entry for this symbol in
1456 the global offset table. */
1463 sgot = bfd_get_section_by_name (dynobj, ".got");
1464 BFD_ASSERT (sgot != NULL);
1471 off = h->got.offset;
1472 BFD_ASSERT (off != (bfd_vma) -1);
1474 dyn = elf_hash_table (info)->dynamic_sections_created;
1475 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1482 /* This is actually a static link, or it is a
1483 -Bsymbolic link and the symbol is defined
1484 locally, or the symbol was forced to be local
1485 because of a version file.. We must initialize
1486 this entry in the global offset table. Since
1487 the offset must always be a multiple of 4, we
1488 use the least significant bit to record whether
1489 we have initialized it already.
1491 When doing a dynamic link, we create a .rela.got
1492 relocation entry to initialize the value. This
1493 is done in the finish_dynamic_symbol routine. */
1498 bfd_put_32 (output_bfd, relocation,
1499 sgot->contents + off);
1504 unresolved_reloc = FALSE;
1508 BFD_ASSERT (local_got_offsets != NULL
1509 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1511 off = local_got_offsets[r_symndx];
1513 /* The offset must always be a multiple of 4. We use
1514 the least significant bit to record whether we have
1515 already generated the necessary reloc. */
1520 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1525 Elf_Internal_Rela outrel;
1528 s = bfd_get_section_by_name (dynobj, ".rela.got");
1529 BFD_ASSERT (s != NULL);
1531 outrel.r_offset = (sgot->output_section->vma
1532 + sgot->output_offset
1534 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1535 outrel.r_addend = relocation;
1537 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1538 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1541 local_got_offsets[r_symndx] |= 1;
1545 relocation = sgot->output_offset + off;
1546 if (r_type == R_68K_GOT8O
1547 || r_type == R_68K_GOT16O
1548 || r_type == R_68K_GOT32O)
1550 /* This relocation does not use the addend. */
1554 relocation += sgot->output_section->vma;
1561 /* Relocation is to the entry for this symbol in the
1562 procedure linkage table. */
1564 /* Resolve a PLTxx reloc against a local symbol directly,
1565 without using the procedure linkage table. */
1569 if (h->plt.offset == (bfd_vma) -1
1570 || !elf_hash_table (info)->dynamic_sections_created)
1572 /* We didn't make a PLT entry for this symbol. This
1573 happens when statically linking PIC code, or when
1574 using -Bsymbolic. */
1580 splt = bfd_get_section_by_name (dynobj, ".plt");
1581 BFD_ASSERT (splt != NULL);
1584 relocation = (splt->output_section->vma
1585 + splt->output_offset
1587 unresolved_reloc = FALSE;
1593 /* Relocation is the offset of the entry for this symbol in
1594 the procedure linkage table. */
1595 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1599 splt = bfd_get_section_by_name (dynobj, ".plt");
1600 BFD_ASSERT (splt != NULL);
1603 relocation = h->plt.offset;
1604 unresolved_reloc = FALSE;
1606 /* This relocation does not use the addend. */
1616 && h->forced_local))
1624 && (input_section->flags & SEC_ALLOC) != 0
1626 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1627 || h->root.type != bfd_link_hash_undefweak)
1628 && ((r_type != R_68K_PC8
1629 && r_type != R_68K_PC16
1630 && r_type != R_68K_PC32)
1634 || !h->def_regular))))
1636 Elf_Internal_Rela outrel;
1638 bfd_boolean skip, relocate;
1640 /* When generating a shared object, these relocations
1641 are copied into the output file to be resolved at run
1648 _bfd_elf_section_offset (output_bfd, info, input_section,
1650 if (outrel.r_offset == (bfd_vma) -1)
1652 else if (outrel.r_offset == (bfd_vma) -2)
1653 skip = TRUE, relocate = TRUE;
1654 outrel.r_offset += (input_section->output_section->vma
1655 + input_section->output_offset);
1658 memset (&outrel, 0, sizeof outrel);
1661 && (r_type == R_68K_PC8
1662 || r_type == R_68K_PC16
1663 || r_type == R_68K_PC32
1666 || !h->def_regular))
1668 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1669 outrel.r_addend = rel->r_addend;
1673 /* This symbol is local, or marked to become local. */
1674 if (r_type == R_68K_32)
1677 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1678 outrel.r_addend = relocation + rel->r_addend;
1684 if (bfd_is_abs_section (sec))
1686 else if (sec == NULL || sec->owner == NULL)
1688 bfd_set_error (bfd_error_bad_value);
1695 osec = sec->output_section;
1696 indx = elf_section_data (osec)->dynindx;
1697 BFD_ASSERT (indx > 0);
1700 outrel.r_info = ELF32_R_INFO (indx, r_type);
1701 outrel.r_addend = relocation + rel->r_addend;
1705 sreloc = elf_section_data (input_section)->sreloc;
1709 loc = sreloc->contents;
1710 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1711 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1713 /* This reloc will be computed at runtime, so there's no
1714 need to do anything now, except for R_68K_32
1715 relocations that have been turned into
1723 case R_68K_GNU_VTINHERIT:
1724 case R_68K_GNU_VTENTRY:
1725 /* These are no-ops in the end. */
1732 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1733 because such sections are not SEC_ALLOC and thus ld.so will
1734 not process them. */
1735 if (unresolved_reloc
1736 && !((input_section->flags & SEC_DEBUGGING) != 0
1739 (*_bfd_error_handler)
1740 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
1743 (long) rel->r_offset,
1744 h->root.root.string);
1748 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1749 contents, rel->r_offset,
1750 relocation, rel->r_addend);
1752 if (r != bfd_reloc_ok)
1757 name = h->root.root.string;
1760 name = bfd_elf_string_from_elf_section (input_bfd,
1761 symtab_hdr->sh_link,
1766 name = bfd_section_name (input_bfd, sec);
1769 if (r == bfd_reloc_overflow)
1771 if (!(info->callbacks->reloc_overflow
1772 (info, (h ? &h->root : NULL), name, howto->name,
1773 (bfd_vma) 0, input_bfd, input_section,
1779 (*_bfd_error_handler)
1780 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
1781 input_bfd, input_section,
1782 (long) rel->r_offset, name, (int) r);
1791 /* Finish up dynamic symbol handling. We set the contents of various
1792 dynamic sections here. */
1795 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1797 struct bfd_link_info *info;
1798 struct elf_link_hash_entry *h;
1799 Elf_Internal_Sym *sym;
1802 int plt_off1, plt_off2, plt_off3;
1804 dynobj = elf_hash_table (info)->dynobj;
1806 if (h->plt.offset != (bfd_vma) -1)
1813 Elf_Internal_Rela rela;
1816 /* This symbol has an entry in the procedure linkage table. Set
1819 BFD_ASSERT (h->dynindx != -1);
1821 splt = bfd_get_section_by_name (dynobj, ".plt");
1822 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1823 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1824 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1826 /* Get the index in the procedure linkage table which
1827 corresponds to this symbol. This is the index of this symbol
1828 in all the symbols for which we are making plt entries. The
1829 first entry in the procedure linkage table is reserved. */
1830 if (CPU32_FLAG (output_bfd))
1831 plt_index = (h->plt.offset / PLT_CPU32_ENTRY_SIZE) - 1;
1832 else if (CFV4E_FLAG (output_bfd))
1833 plt_index = (h->plt.offset / CFV4E_PLT_ENTRY_SIZE) - 1;
1835 plt_index = (h->plt.offset / PLT_ENTRY_SIZE) - 1;
1837 /* Get the offset into the .got table of the entry that
1838 corresponds to this function. Each .got entry is 4 bytes.
1839 The first three are reserved. */
1840 got_offset = (plt_index + 3) * 4;
1842 if (CPU32_FLAG (output_bfd))
1844 /* Fill in the entry in the procedure linkage table. */
1845 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1846 PLT_CPU32_ENTRY_SIZE);
1851 else if (CFV4E_FLAG (output_bfd))
1853 memcpy (splt->contents + h->plt.offset, elf_cfv4e_plt_entry,
1854 CFV4E_PLT_ENTRY_SIZE);
1861 /* Fill in the entry in the procedure linkage table. */
1862 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1869 /* The offset is relative to the first extension word. */
1870 bfd_put_32 (output_bfd,
1871 sgot->output_section->vma
1872 + sgot->output_offset
1874 - (splt->output_section->vma
1876 + CFV4E_FLAG (output_bfd) ? 8 : 2),
1877 splt->contents + h->plt.offset + plt_off1);
1879 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1880 splt->contents + h->plt.offset + plt_off2);
1881 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1882 splt->contents + h->plt.offset + plt_off3);
1884 /* Fill in the entry in the global offset table. */
1885 bfd_put_32 (output_bfd,
1886 (splt->output_section->vma
1887 + splt->output_offset
1889 + CFV4E_FLAG (output_bfd) ? 12 : 8),
1890 sgot->contents + got_offset);
1892 /* Fill in the entry in the .rela.plt section. */
1893 rela.r_offset = (sgot->output_section->vma
1894 + sgot->output_offset
1896 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1898 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1899 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1901 if (!h->def_regular)
1903 /* Mark the symbol as undefined, rather than as defined in
1904 the .plt section. Leave the value alone. */
1905 sym->st_shndx = SHN_UNDEF;
1909 if (h->got.offset != (bfd_vma) -1)
1913 Elf_Internal_Rela rela;
1916 /* This symbol has an entry in the global offset table. Set it
1919 sgot = bfd_get_section_by_name (dynobj, ".got");
1920 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1921 BFD_ASSERT (sgot != NULL && srela != NULL);
1923 rela.r_offset = (sgot->output_section->vma
1924 + sgot->output_offset
1925 + (h->got.offset &~ (bfd_vma) 1));
1927 /* If this is a -Bsymbolic link, and the symbol is defined
1928 locally, we just want to emit a RELATIVE reloc. Likewise if
1929 the symbol was forced to be local because of a version file.
1930 The entry in the global offset table will already have been
1931 initialized in the relocate_section function. */
1938 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1939 rela.r_addend = bfd_get_signed_32 (output_bfd,
1941 + (h->got.offset &~ (bfd_vma) 1)));
1945 bfd_put_32 (output_bfd, (bfd_vma) 0,
1946 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1947 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1951 loc = srela->contents;
1952 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1953 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1959 Elf_Internal_Rela rela;
1962 /* This symbol needs a copy reloc. Set it up. */
1964 BFD_ASSERT (h->dynindx != -1
1965 && (h->root.type == bfd_link_hash_defined
1966 || h->root.type == bfd_link_hash_defweak));
1968 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1970 BFD_ASSERT (s != NULL);
1972 rela.r_offset = (h->root.u.def.value
1973 + h->root.u.def.section->output_section->vma
1974 + h->root.u.def.section->output_offset);
1975 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1977 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1978 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1981 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1982 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1983 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1984 sym->st_shndx = SHN_ABS;
1989 /* Finish up the dynamic sections. */
1992 elf_m68k_finish_dynamic_sections (output_bfd, info)
1994 struct bfd_link_info *info;
2000 dynobj = elf_hash_table (info)->dynobj;
2002 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2003 BFD_ASSERT (sgot != NULL);
2004 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2006 if (elf_hash_table (info)->dynamic_sections_created)
2009 Elf32_External_Dyn *dyncon, *dynconend;
2011 splt = bfd_get_section_by_name (dynobj, ".plt");
2012 BFD_ASSERT (splt != NULL && sdyn != NULL);
2014 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2015 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2016 for (; dyncon < dynconend; dyncon++)
2018 Elf_Internal_Dyn dyn;
2022 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2035 s = bfd_get_section_by_name (output_bfd, name);
2036 BFD_ASSERT (s != NULL);
2037 dyn.d_un.d_ptr = s->vma;
2038 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2042 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2043 BFD_ASSERT (s != NULL);
2044 dyn.d_un.d_val = s->size;
2045 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2049 /* The procedure linkage table relocs (DT_JMPREL) should
2050 not be included in the overall relocs (DT_RELA).
2051 Therefore, we override the DT_RELASZ entry here to
2052 make it not include the JMPREL relocs. Since the
2053 linker script arranges for .rela.plt to follow all
2054 other relocation sections, we don't have to worry
2055 about changing the DT_RELA entry. */
2056 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2058 dyn.d_un.d_val -= s->size;
2059 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2064 /* Fill in the first entry in the procedure linkage table. */
2067 if (CFV4E_FLAG (output_bfd))
2069 memcpy (splt->contents, elf_cfv4e_plt0_entry, CFV4E_PLT_ENTRY_SIZE);
2070 bfd_put_32 (output_bfd,
2071 (sgot->output_section->vma
2072 + sgot->output_offset + 4
2073 - (splt->output_section->vma + 2)),
2074 splt->contents + 2);
2075 bfd_put_32 (output_bfd,
2076 (sgot->output_section->vma
2077 + sgot->output_offset + 8
2078 - (splt->output_section->vma + 10) - 8),
2079 splt->contents + 12);
2080 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2081 = CFV4E_PLT_ENTRY_SIZE;
2083 else if (CPU32_FLAG (output_bfd))
2085 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2086 bfd_put_32 (output_bfd,
2087 (sgot->output_section->vma
2088 + sgot->output_offset + 4
2089 - (splt->output_section->vma + 2)),
2090 splt->contents + 4);
2091 bfd_put_32 (output_bfd,
2092 (sgot->output_section->vma
2093 + sgot->output_offset + 8
2094 - (splt->output_section->vma + 10)),
2095 splt->contents + 12);
2096 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2097 = PLT_CPU32_ENTRY_SIZE;
2101 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2102 bfd_put_32 (output_bfd,
2103 (sgot->output_section->vma
2104 + sgot->output_offset + 4
2105 - (splt->output_section->vma + 2)),
2106 splt->contents + 4);
2107 bfd_put_32 (output_bfd,
2108 (sgot->output_section->vma
2109 + sgot->output_offset + 8
2110 - (splt->output_section->vma + 10)),
2111 splt->contents + 12);
2112 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2118 /* Fill in the first three entries in the global offset table. */
2122 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2124 bfd_put_32 (output_bfd,
2125 sdyn->output_section->vma + sdyn->output_offset,
2127 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2128 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2131 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2136 /* Given a .data section and a .emreloc in-memory section, store
2137 relocation information into the .emreloc section which can be
2138 used at runtime to relocate the section. This is called by the
2139 linker when the --embedded-relocs switch is used. This is called
2140 after the add_symbols entry point has been called for all the
2141 objects, and before the final_link entry point is called. */
2144 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2146 struct bfd_link_info *info;
2151 Elf_Internal_Shdr *symtab_hdr;
2152 Elf_Internal_Sym *isymbuf = NULL;
2153 Elf_Internal_Rela *internal_relocs = NULL;
2154 Elf_Internal_Rela *irel, *irelend;
2158 BFD_ASSERT (! info->relocatable);
2162 if (datasec->reloc_count == 0)
2165 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2167 /* Get a copy of the native relocations. */
2168 internal_relocs = (_bfd_elf_link_read_relocs
2169 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2170 info->keep_memory));
2171 if (internal_relocs == NULL)
2174 amt = (bfd_size_type) datasec->reloc_count * 12;
2175 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2176 if (relsec->contents == NULL)
2179 p = relsec->contents;
2181 irelend = internal_relocs + datasec->reloc_count;
2182 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2184 asection *targetsec;
2186 /* We are going to write a four byte longword into the runtime
2187 reloc section. The longword will be the address in the data
2188 section which must be relocated. It is followed by the name
2189 of the target section NUL-padded or truncated to 8
2192 /* We can only relocate absolute longword relocs at run time. */
2193 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2195 *errmsg = _("unsupported reloc type");
2196 bfd_set_error (bfd_error_bad_value);
2200 /* Get the target section referred to by the reloc. */
2201 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2203 /* A local symbol. */
2204 Elf_Internal_Sym *isym;
2206 /* Read this BFD's local symbols if we haven't done so already. */
2207 if (isymbuf == NULL)
2209 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2210 if (isymbuf == NULL)
2211 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2212 symtab_hdr->sh_info, 0,
2214 if (isymbuf == NULL)
2218 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2219 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2224 struct elf_link_hash_entry *h;
2226 /* An external symbol. */
2227 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2228 h = elf_sym_hashes (abfd)[indx];
2229 BFD_ASSERT (h != NULL);
2230 if (h->root.type == bfd_link_hash_defined
2231 || h->root.type == bfd_link_hash_defweak)
2232 targetsec = h->root.u.def.section;
2237 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2238 memset (p + 4, 0, 8);
2239 if (targetsec != NULL)
2240 strncpy ((char *) p + 4, targetsec->output_section->name, 8);
2243 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2245 if (internal_relocs != NULL
2246 && elf_section_data (datasec)->relocs != internal_relocs)
2247 free (internal_relocs);
2251 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2253 if (internal_relocs != NULL
2254 && elf_section_data (datasec)->relocs != internal_relocs)
2255 free (internal_relocs);
2259 static enum elf_reloc_type_class
2260 elf32_m68k_reloc_type_class (rela)
2261 const Elf_Internal_Rela *rela;
2263 switch ((int) ELF32_R_TYPE (rela->r_info))
2265 case R_68K_RELATIVE:
2266 return reloc_class_relative;
2267 case R_68K_JMP_SLOT:
2268 return reloc_class_plt;
2270 return reloc_class_copy;
2272 return reloc_class_normal;
2276 /* Return address for Ith PLT stub in section PLT, for relocation REL
2277 or (bfd_vma) -1 if it should not be included. */
2280 elf_m68k_plt_sym_val (bfd_vma i, const asection *plt,
2281 const arelent *rel ATTRIBUTE_UNUSED)
2283 if (CPU32_FLAG (plt->owner))
2284 return plt->vma + (i + 1) * PLT_CPU32_ENTRY_SIZE;
2285 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
2288 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2289 #define TARGET_BIG_NAME "elf32-m68k"
2290 #define ELF_MACHINE_CODE EM_68K
2291 #define ELF_MAXPAGESIZE 0x2000
2292 #define elf_backend_create_dynamic_sections \
2293 _bfd_elf_create_dynamic_sections
2294 #define bfd_elf32_bfd_link_hash_table_create \
2295 elf_m68k_link_hash_table_create
2296 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
2298 #define elf_backend_check_relocs elf_m68k_check_relocs
2299 #define elf_backend_adjust_dynamic_symbol \
2300 elf_m68k_adjust_dynamic_symbol
2301 #define elf_backend_size_dynamic_sections \
2302 elf_m68k_size_dynamic_sections
2303 #define elf_backend_relocate_section elf_m68k_relocate_section
2304 #define elf_backend_finish_dynamic_symbol \
2305 elf_m68k_finish_dynamic_symbol
2306 #define elf_backend_finish_dynamic_sections \
2307 elf_m68k_finish_dynamic_sections
2308 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2309 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2310 #define bfd_elf32_bfd_merge_private_bfd_data \
2311 elf32_m68k_merge_private_bfd_data
2312 #define bfd_elf32_bfd_set_private_flags \
2313 elf32_m68k_set_private_flags
2314 #define bfd_elf32_bfd_print_private_bfd_data \
2315 elf32_m68k_print_private_bfd_data
2316 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2317 #define elf_backend_plt_sym_val elf_m68k_plt_sym_val
2319 #define elf_backend_can_gc_sections 1
2320 #define elf_backend_can_refcount 1
2321 #define elf_backend_want_got_plt 1
2322 #define elf_backend_plt_readonly 1
2323 #define elf_backend_want_plt_sym 0
2324 #define elf_backend_got_header_size 12
2325 #define elf_backend_rela_normal 1
2327 #include "elf32-target.h"