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;
750 s = (bfd_section_from_r_symndx
751 (abfd, &elf_m68k_hash_table (info)->sym_sec,
756 vpp = &elf_section_data (s)->local_dynrel;
757 head = (struct elf_m68k_pcrel_relocs_copied **) vpp;
760 for (p = *head; p != NULL; p = p->next)
761 if (p->section == sreloc)
766 p = ((struct elf_m68k_pcrel_relocs_copied *)
767 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
782 /* This relocation describes the C++ object vtable hierarchy.
783 Reconstruct it for later use during GC. */
784 case R_68K_GNU_VTINHERIT:
785 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
789 /* This relocation describes which C++ vtable entries are actually
790 used. Record for later use during GC. */
791 case R_68K_GNU_VTENTRY:
792 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
804 /* Return the section that should be marked against GC for a given
808 elf_m68k_gc_mark_hook (sec, info, rel, h, sym)
810 struct bfd_link_info *info ATTRIBUTE_UNUSED;
811 Elf_Internal_Rela *rel;
812 struct elf_link_hash_entry *h;
813 Elf_Internal_Sym *sym;
817 switch (ELF32_R_TYPE (rel->r_info))
819 case R_68K_GNU_VTINHERIT:
820 case R_68K_GNU_VTENTRY:
824 switch (h->root.type)
829 case bfd_link_hash_defined:
830 case bfd_link_hash_defweak:
831 return h->root.u.def.section;
833 case bfd_link_hash_common:
834 return h->root.u.c.p->section;
839 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
844 /* Update the got entry reference counts for the section being removed. */
847 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
849 struct bfd_link_info *info;
851 const Elf_Internal_Rela *relocs;
853 Elf_Internal_Shdr *symtab_hdr;
854 struct elf_link_hash_entry **sym_hashes;
855 bfd_signed_vma *local_got_refcounts;
856 const Elf_Internal_Rela *rel, *relend;
861 dynobj = elf_hash_table (info)->dynobj;
865 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
866 sym_hashes = elf_sym_hashes (abfd);
867 local_got_refcounts = elf_local_got_refcounts (abfd);
869 sgot = bfd_get_section_by_name (dynobj, ".got");
870 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
872 relend = relocs + sec->reloc_count;
873 for (rel = relocs; rel < relend; rel++)
875 unsigned long r_symndx;
876 struct elf_link_hash_entry *h = NULL;
878 r_symndx = ELF32_R_SYM (rel->r_info);
879 if (r_symndx >= symtab_hdr->sh_info)
881 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
882 while (h->root.type == bfd_link_hash_indirect
883 || h->root.type == bfd_link_hash_warning)
884 h = (struct elf_link_hash_entry *) h->root.u.i.link;
887 switch (ELF32_R_TYPE (rel->r_info))
897 if (h->got.refcount > 0)
900 if (h->got.refcount == 0)
902 /* We don't need the .got entry any more. */
904 srelgot->size -= sizeof (Elf32_External_Rela);
908 else if (local_got_refcounts != NULL)
910 if (local_got_refcounts[r_symndx] > 0)
912 --local_got_refcounts[r_symndx];
913 if (local_got_refcounts[r_symndx] == 0)
915 /* We don't need the .got entry any more. */
918 srelgot->size -= sizeof (Elf32_External_Rela);
938 if (h->plt.refcount > 0)
951 /* Adjust a symbol defined by a dynamic object and referenced by a
952 regular object. The current definition is in some section of the
953 dynamic object, but we're not including those sections. We have to
954 change the definition to something the rest of the link can
958 elf_m68k_adjust_dynamic_symbol (info, h)
959 struct bfd_link_info *info;
960 struct elf_link_hash_entry *h;
964 unsigned int power_of_two;
966 dynobj = elf_hash_table (info)->dynobj;
968 /* Make sure we know what is going on here. */
969 BFD_ASSERT (dynobj != NULL
971 || h->u.weakdef != NULL
974 && !h->def_regular)));
976 /* If this is a function, put it in the procedure linkage table. We
977 will fill in the contents of the procedure linkage table later,
978 when we know the address of the .got section. */
979 if (h->type == STT_FUNC
982 if ((h->plt.refcount <= 0
983 || SYMBOL_CALLS_LOCAL (info, h)
984 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
985 && h->root.type == bfd_link_hash_undefweak))
986 /* We must always create the plt entry if it was referenced
987 by a PLTxxO relocation. In this case we already recorded
988 it as a dynamic symbol. */
991 /* This case can occur if we saw a PLTxx reloc in an input
992 file, but the symbol was never referred to by a dynamic
993 object, or if all references were garbage collected. In
994 such a case, we don't actually need to build a procedure
995 linkage table, and we can just do a PCxx reloc instead. */
996 h->plt.offset = (bfd_vma) -1;
1001 /* Make sure this symbol is output as a dynamic symbol. */
1002 if (h->dynindx == -1
1003 && !h->forced_local)
1005 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1009 s = bfd_get_section_by_name (dynobj, ".plt");
1010 BFD_ASSERT (s != NULL);
1012 /* If this is the first .plt entry, make room for the special
1016 if (CPU32_FLAG (dynobj))
1017 s->size += PLT_CPU32_ENTRY_SIZE;
1018 else if (CFV4E_FLAG (dynobj))
1019 s->size += CFV4E_PLT_ENTRY_SIZE;
1021 s->size += PLT_ENTRY_SIZE;
1024 /* If this symbol is not defined in a regular file, and we are
1025 not generating a shared library, then set the symbol to this
1026 location in the .plt. This is required to make function
1027 pointers compare as equal between the normal executable and
1028 the shared library. */
1032 h->root.u.def.section = s;
1033 h->root.u.def.value = s->size;
1036 h->plt.offset = s->size;
1038 /* Make room for this entry. */
1039 if (CPU32_FLAG (dynobj))
1040 s->size += PLT_CPU32_ENTRY_SIZE;
1041 else if (CFV4E_FLAG (dynobj))
1042 s->size += CFV4E_PLT_ENTRY_SIZE;
1044 s->size += PLT_ENTRY_SIZE;
1046 /* We also need to make an entry in the .got.plt section, which
1047 will be placed in the .got section by the linker script. */
1048 s = bfd_get_section_by_name (dynobj, ".got.plt");
1049 BFD_ASSERT (s != NULL);
1052 /* We also need to make an entry in the .rela.plt section. */
1053 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1054 BFD_ASSERT (s != NULL);
1055 s->size += sizeof (Elf32_External_Rela);
1060 /* Reinitialize the plt offset now that it is not used as a reference
1062 h->plt.offset = (bfd_vma) -1;
1064 /* If this is a weak symbol, and there is a real definition, the
1065 processor independent code will have arranged for us to see the
1066 real definition first, and we can just use the same value. */
1067 if (h->u.weakdef != NULL)
1069 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1070 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1071 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1072 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1076 /* This is a reference to a symbol defined by a dynamic object which
1077 is not a function. */
1079 /* If we are creating a shared library, we must presume that the
1080 only references to the symbol are via the global offset table.
1081 For such cases we need not do anything here; the relocations will
1082 be handled correctly by relocate_section. */
1088 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1089 h->root.root.string);
1093 /* We must allocate the symbol in our .dynbss section, which will
1094 become part of the .bss section of the executable. There will be
1095 an entry for this symbol in the .dynsym section. The dynamic
1096 object will contain position independent code, so all references
1097 from the dynamic object to this symbol will go through the global
1098 offset table. The dynamic linker will use the .dynsym entry to
1099 determine the address it must put in the global offset table, so
1100 both the dynamic object and the regular object will refer to the
1101 same memory location for the variable. */
1103 s = bfd_get_section_by_name (dynobj, ".dynbss");
1104 BFD_ASSERT (s != NULL);
1106 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1107 copy the initial value out of the dynamic object and into the
1108 runtime process image. We need to remember the offset into the
1109 .rela.bss section we are going to use. */
1110 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1114 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1115 BFD_ASSERT (srel != NULL);
1116 srel->size += sizeof (Elf32_External_Rela);
1120 /* We need to figure out the alignment required for this symbol. I
1121 have no idea how ELF linkers handle this. */
1122 power_of_two = bfd_log2 (h->size);
1123 if (power_of_two > 3)
1126 /* Apply the required alignment. */
1127 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1128 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1130 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1134 /* Define the symbol as being at this point in the section. */
1135 h->root.u.def.section = s;
1136 h->root.u.def.value = s->size;
1138 /* Increment the section size to make room for the symbol. */
1144 /* Set the sizes of the dynamic sections. */
1147 elf_m68k_size_dynamic_sections (output_bfd, info)
1148 bfd *output_bfd ATTRIBUTE_UNUSED;
1149 struct bfd_link_info *info;
1156 dynobj = elf_hash_table (info)->dynobj;
1157 BFD_ASSERT (dynobj != NULL);
1159 if (elf_hash_table (info)->dynamic_sections_created)
1161 /* Set the contents of the .interp section to the interpreter. */
1162 if (info->executable)
1164 s = bfd_get_section_by_name (dynobj, ".interp");
1165 BFD_ASSERT (s != NULL);
1166 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1167 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1172 /* We may have created entries in the .rela.got section.
1173 However, if we are not creating the dynamic sections, we will
1174 not actually use these entries. Reset the size of .rela.got,
1175 which will cause it to get stripped from the output file
1177 s = bfd_get_section_by_name (dynobj, ".rela.got");
1182 /* If this is a -Bsymbolic shared link, then we need to discard all
1183 PC relative relocs against symbols defined in a regular object.
1184 For the normal shared case we discard the PC relative relocs
1185 against symbols that have become local due to visibility changes.
1186 We allocated space for them in the check_relocs routine, but we
1187 will not fill them in in the relocate_section routine. */
1189 elf_link_hash_traverse (elf_hash_table (info),
1190 elf_m68k_discard_copies,
1193 /* The check_relocs and adjust_dynamic_symbol entry points have
1194 determined the sizes of the various dynamic sections. Allocate
1198 for (s = dynobj->sections; s != NULL; s = s->next)
1202 if ((s->flags & SEC_LINKER_CREATED) == 0)
1205 /* It's OK to base decisions on the section name, because none
1206 of the dynobj section names depend upon the input files. */
1207 name = bfd_get_section_name (dynobj, s);
1209 if (strcmp (name, ".plt") == 0)
1211 /* Remember whether there is a PLT. */
1214 else if (strncmp (name, ".rela", 5) == 0)
1220 /* We use the reloc_count field as a counter if we need
1221 to copy relocs into the output file. */
1225 else if (strncmp (name, ".got", 4) != 0
1226 && strcmp (name, ".dynbss") != 0)
1228 /* It's not one of our sections, so don't allocate space. */
1234 /* If we don't need this section, strip it from the
1235 output file. This is mostly to handle .rela.bss and
1236 .rela.plt. We must create both sections in
1237 create_dynamic_sections, because they must be created
1238 before the linker maps input sections to output
1239 sections. The linker does that before
1240 adjust_dynamic_symbol is called, and it is that
1241 function which decides whether anything needs to go
1242 into these sections. */
1243 s->flags |= SEC_EXCLUDE;
1247 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1250 /* Allocate memory for the section contents. */
1251 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1252 Unused entries should be reclaimed before the section's contents
1253 are written out, but at the moment this does not happen. Thus in
1254 order to prevent writing out garbage, we initialise the section's
1255 contents to zero. */
1256 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1257 if (s->contents == NULL)
1261 if (elf_hash_table (info)->dynamic_sections_created)
1263 /* Add some entries to the .dynamic section. We fill in the
1264 values later, in elf_m68k_finish_dynamic_sections, but we
1265 must add the entries now so that we get the correct size for
1266 the .dynamic section. The DT_DEBUG entry is filled in by the
1267 dynamic linker and used by the debugger. */
1268 #define add_dynamic_entry(TAG, VAL) \
1269 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1273 if (!add_dynamic_entry (DT_DEBUG, 0))
1279 if (!add_dynamic_entry (DT_PLTGOT, 0)
1280 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1281 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1282 || !add_dynamic_entry (DT_JMPREL, 0))
1288 if (!add_dynamic_entry (DT_RELA, 0)
1289 || !add_dynamic_entry (DT_RELASZ, 0)
1290 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1294 if ((info->flags & DF_TEXTREL) != 0)
1296 if (!add_dynamic_entry (DT_TEXTREL, 0))
1300 #undef add_dynamic_entry
1305 /* This function is called via elf_link_hash_traverse if we are
1306 creating a shared object. In the -Bsymbolic case it discards the
1307 space allocated to copy PC relative relocs against symbols which
1308 are defined in regular objects. For the normal shared case, it
1309 discards space for pc-relative relocs that have become local due to
1310 symbol visibility changes. We allocated space for them in the
1311 check_relocs routine, but we won't fill them in in the
1312 relocate_section routine.
1314 We also check whether any of the remaining relocations apply
1315 against a readonly section, and set the DF_TEXTREL flag in this
1319 elf_m68k_discard_copies (h, inf)
1320 struct elf_link_hash_entry *h;
1323 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1324 struct elf_m68k_pcrel_relocs_copied *s;
1326 if (h->root.type == bfd_link_hash_warning)
1327 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1331 && !h->forced_local))
1333 if ((info->flags & DF_TEXTREL) == 0)
1335 /* Look for relocations against read-only sections. */
1336 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1339 if ((s->section->flags & SEC_READONLY) != 0)
1341 info->flags |= DF_TEXTREL;
1349 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1352 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1357 /* Relocate an M68K ELF section. */
1360 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1361 contents, relocs, local_syms, local_sections)
1363 struct bfd_link_info *info;
1365 asection *input_section;
1367 Elf_Internal_Rela *relocs;
1368 Elf_Internal_Sym *local_syms;
1369 asection **local_sections;
1372 Elf_Internal_Shdr *symtab_hdr;
1373 struct elf_link_hash_entry **sym_hashes;
1374 bfd_vma *local_got_offsets;
1378 Elf_Internal_Rela *rel;
1379 Elf_Internal_Rela *relend;
1381 if (info->relocatable)
1384 dynobj = elf_hash_table (info)->dynobj;
1385 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1386 sym_hashes = elf_sym_hashes (input_bfd);
1387 local_got_offsets = elf_local_got_offsets (input_bfd);
1394 relend = relocs + input_section->reloc_count;
1395 for (; rel < relend; rel++)
1398 reloc_howto_type *howto;
1399 unsigned long r_symndx;
1400 struct elf_link_hash_entry *h;
1401 Elf_Internal_Sym *sym;
1404 bfd_boolean unresolved_reloc;
1405 bfd_reloc_status_type r;
1407 r_type = ELF32_R_TYPE (rel->r_info);
1408 if (r_type < 0 || r_type >= (int) R_68K_max)
1410 bfd_set_error (bfd_error_bad_value);
1413 howto = howto_table + r_type;
1415 r_symndx = ELF32_R_SYM (rel->r_info);
1420 unresolved_reloc = FALSE;
1422 if (r_symndx < symtab_hdr->sh_info)
1424 sym = local_syms + r_symndx;
1425 sec = local_sections[r_symndx];
1426 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1432 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1433 r_symndx, symtab_hdr, sym_hashes,
1435 unresolved_reloc, warned);
1443 /* Relocation is to the address of the entry for this symbol
1444 in the global offset table. */
1446 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1452 /* Relocation is the offset of the entry for this symbol in
1453 the global offset table. */
1460 sgot = bfd_get_section_by_name (dynobj, ".got");
1461 BFD_ASSERT (sgot != NULL);
1468 off = h->got.offset;
1469 BFD_ASSERT (off != (bfd_vma) -1);
1471 dyn = elf_hash_table (info)->dynamic_sections_created;
1472 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1479 /* This is actually a static link, or it is a
1480 -Bsymbolic link and the symbol is defined
1481 locally, or the symbol was forced to be local
1482 because of a version file.. We must initialize
1483 this entry in the global offset table. Since
1484 the offset must always be a multiple of 4, we
1485 use the least significant bit to record whether
1486 we have initialized it already.
1488 When doing a dynamic link, we create a .rela.got
1489 relocation entry to initialize the value. This
1490 is done in the finish_dynamic_symbol routine. */
1495 bfd_put_32 (output_bfd, relocation,
1496 sgot->contents + off);
1501 unresolved_reloc = FALSE;
1505 BFD_ASSERT (local_got_offsets != NULL
1506 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1508 off = local_got_offsets[r_symndx];
1510 /* The offset must always be a multiple of 4. We use
1511 the least significant bit to record whether we have
1512 already generated the necessary reloc. */
1517 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1522 Elf_Internal_Rela outrel;
1525 s = bfd_get_section_by_name (dynobj, ".rela.got");
1526 BFD_ASSERT (s != NULL);
1528 outrel.r_offset = (sgot->output_section->vma
1529 + sgot->output_offset
1531 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1532 outrel.r_addend = relocation;
1534 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1535 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1538 local_got_offsets[r_symndx] |= 1;
1542 relocation = sgot->output_offset + off;
1543 if (r_type == R_68K_GOT8O
1544 || r_type == R_68K_GOT16O
1545 || r_type == R_68K_GOT32O)
1547 /* This relocation does not use the addend. */
1551 relocation += sgot->output_section->vma;
1558 /* Relocation is to the entry for this symbol in the
1559 procedure linkage table. */
1561 /* Resolve a PLTxx reloc against a local symbol directly,
1562 without using the procedure linkage table. */
1566 if (h->plt.offset == (bfd_vma) -1
1567 || !elf_hash_table (info)->dynamic_sections_created)
1569 /* We didn't make a PLT entry for this symbol. This
1570 happens when statically linking PIC code, or when
1571 using -Bsymbolic. */
1577 splt = bfd_get_section_by_name (dynobj, ".plt");
1578 BFD_ASSERT (splt != NULL);
1581 relocation = (splt->output_section->vma
1582 + splt->output_offset
1584 unresolved_reloc = FALSE;
1590 /* Relocation is the offset of the entry for this symbol in
1591 the procedure linkage table. */
1592 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1596 splt = bfd_get_section_by_name (dynobj, ".plt");
1597 BFD_ASSERT (splt != NULL);
1600 relocation = h->plt.offset;
1601 unresolved_reloc = FALSE;
1603 /* This relocation does not use the addend. */
1613 && h->forced_local))
1621 && (input_section->flags & SEC_ALLOC) != 0
1623 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1624 || h->root.type != bfd_link_hash_undefweak)
1625 && ((r_type != R_68K_PC8
1626 && r_type != R_68K_PC16
1627 && r_type != R_68K_PC32)
1631 || !h->def_regular))))
1633 Elf_Internal_Rela outrel;
1635 bfd_boolean skip, relocate;
1637 /* When generating a shared object, these relocations
1638 are copied into the output file to be resolved at run
1645 _bfd_elf_section_offset (output_bfd, info, input_section,
1647 if (outrel.r_offset == (bfd_vma) -1)
1649 else if (outrel.r_offset == (bfd_vma) -2)
1650 skip = TRUE, relocate = TRUE;
1651 outrel.r_offset += (input_section->output_section->vma
1652 + input_section->output_offset);
1655 memset (&outrel, 0, sizeof outrel);
1658 && (r_type == R_68K_PC8
1659 || r_type == R_68K_PC16
1660 || r_type == R_68K_PC32
1663 || !h->def_regular))
1665 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1666 outrel.r_addend = rel->r_addend;
1670 /* This symbol is local, or marked to become local. */
1671 if (r_type == R_68K_32)
1674 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1675 outrel.r_addend = relocation + rel->r_addend;
1681 if (bfd_is_abs_section (sec))
1683 else if (sec == NULL || sec->owner == NULL)
1685 bfd_set_error (bfd_error_bad_value);
1692 osec = sec->output_section;
1693 indx = elf_section_data (osec)->dynindx;
1694 BFD_ASSERT (indx > 0);
1697 outrel.r_info = ELF32_R_INFO (indx, r_type);
1698 outrel.r_addend = relocation + rel->r_addend;
1702 sreloc = elf_section_data (input_section)->sreloc;
1706 loc = sreloc->contents;
1707 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1708 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1710 /* This reloc will be computed at runtime, so there's no
1711 need to do anything now, except for R_68K_32
1712 relocations that have been turned into
1720 case R_68K_GNU_VTINHERIT:
1721 case R_68K_GNU_VTENTRY:
1722 /* These are no-ops in the end. */
1729 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1730 because such sections are not SEC_ALLOC and thus ld.so will
1731 not process them. */
1732 if (unresolved_reloc
1733 && !((input_section->flags & SEC_DEBUGGING) != 0
1736 (*_bfd_error_handler)
1737 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
1740 (long) rel->r_offset,
1742 h->root.root.string);
1746 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1747 contents, rel->r_offset,
1748 relocation, rel->r_addend);
1750 if (r != bfd_reloc_ok)
1755 name = h->root.root.string;
1758 name = bfd_elf_string_from_elf_section (input_bfd,
1759 symtab_hdr->sh_link,
1764 name = bfd_section_name (input_bfd, sec);
1767 if (r == bfd_reloc_overflow)
1769 if (!(info->callbacks->reloc_overflow
1770 (info, (h ? &h->root : NULL), name, howto->name,
1771 (bfd_vma) 0, input_bfd, input_section,
1777 (*_bfd_error_handler)
1778 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
1779 input_bfd, input_section,
1780 (long) rel->r_offset, name, (int) r);
1789 /* Finish up dynamic symbol handling. We set the contents of various
1790 dynamic sections here. */
1793 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1795 struct bfd_link_info *info;
1796 struct elf_link_hash_entry *h;
1797 Elf_Internal_Sym *sym;
1800 int plt_off1, plt_off2, plt_off3;
1802 dynobj = elf_hash_table (info)->dynobj;
1804 if (h->plt.offset != (bfd_vma) -1)
1811 Elf_Internal_Rela rela;
1814 /* This symbol has an entry in the procedure linkage table. Set
1817 BFD_ASSERT (h->dynindx != -1);
1819 splt = bfd_get_section_by_name (dynobj, ".plt");
1820 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1821 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1822 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1824 /* Get the index in the procedure linkage table which
1825 corresponds to this symbol. This is the index of this symbol
1826 in all the symbols for which we are making plt entries. The
1827 first entry in the procedure linkage table is reserved. */
1828 if (CPU32_FLAG (output_bfd))
1829 plt_index = (h->plt.offset / PLT_CPU32_ENTRY_SIZE) - 1;
1830 else if (CFV4E_FLAG (output_bfd))
1831 plt_index = (h->plt.offset / CFV4E_PLT_ENTRY_SIZE) - 1;
1833 plt_index = (h->plt.offset / PLT_ENTRY_SIZE) - 1;
1835 /* Get the offset into the .got table of the entry that
1836 corresponds to this function. Each .got entry is 4 bytes.
1837 The first three are reserved. */
1838 got_offset = (plt_index + 3) * 4;
1840 if (CPU32_FLAG (output_bfd))
1842 /* Fill in the entry in the procedure linkage table. */
1843 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1844 PLT_CPU32_ENTRY_SIZE);
1849 else if (CFV4E_FLAG (output_bfd))
1851 memcpy (splt->contents + h->plt.offset, elf_cfv4e_plt_entry,
1852 CFV4E_PLT_ENTRY_SIZE);
1859 /* Fill in the entry in the procedure linkage table. */
1860 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1867 /* The offset is relative to the first extension word. */
1868 bfd_put_32 (output_bfd,
1869 sgot->output_section->vma
1870 + sgot->output_offset
1872 - (splt->output_section->vma
1874 + (CFV4E_FLAG (output_bfd) ? 8 : 2)),
1875 splt->contents + h->plt.offset + plt_off1);
1877 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1878 splt->contents + h->plt.offset + plt_off2);
1879 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1880 splt->contents + h->plt.offset + plt_off3);
1882 /* Fill in the entry in the global offset table. */
1883 bfd_put_32 (output_bfd,
1884 (splt->output_section->vma
1885 + splt->output_offset
1887 + (CFV4E_FLAG (output_bfd) ? 12 : 8)),
1888 sgot->contents + got_offset);
1890 /* Fill in the entry in the .rela.plt section. */
1891 rela.r_offset = (sgot->output_section->vma
1892 + sgot->output_offset
1894 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1896 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1897 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1899 if (!h->def_regular)
1901 /* Mark the symbol as undefined, rather than as defined in
1902 the .plt section. Leave the value alone. */
1903 sym->st_shndx = SHN_UNDEF;
1907 if (h->got.offset != (bfd_vma) -1)
1911 Elf_Internal_Rela rela;
1914 /* This symbol has an entry in the global offset table. Set it
1917 sgot = bfd_get_section_by_name (dynobj, ".got");
1918 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1919 BFD_ASSERT (sgot != NULL && srela != NULL);
1921 rela.r_offset = (sgot->output_section->vma
1922 + sgot->output_offset
1923 + (h->got.offset &~ (bfd_vma) 1));
1925 /* If this is a -Bsymbolic link, and the symbol is defined
1926 locally, we just want to emit a RELATIVE reloc. Likewise if
1927 the symbol was forced to be local because of a version file.
1928 The entry in the global offset table will already have been
1929 initialized in the relocate_section function. */
1936 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1937 rela.r_addend = bfd_get_signed_32 (output_bfd,
1939 + (h->got.offset &~ (bfd_vma) 1)));
1943 bfd_put_32 (output_bfd, (bfd_vma) 0,
1944 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1945 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1949 loc = srela->contents;
1950 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1951 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1957 Elf_Internal_Rela rela;
1960 /* This symbol needs a copy reloc. Set it up. */
1962 BFD_ASSERT (h->dynindx != -1
1963 && (h->root.type == bfd_link_hash_defined
1964 || h->root.type == bfd_link_hash_defweak));
1966 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1968 BFD_ASSERT (s != NULL);
1970 rela.r_offset = (h->root.u.def.value
1971 + h->root.u.def.section->output_section->vma
1972 + h->root.u.def.section->output_offset);
1973 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1975 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1976 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1979 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1980 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1981 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1982 sym->st_shndx = SHN_ABS;
1987 /* Finish up the dynamic sections. */
1990 elf_m68k_finish_dynamic_sections (output_bfd, info)
1992 struct bfd_link_info *info;
1998 dynobj = elf_hash_table (info)->dynobj;
2000 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2001 BFD_ASSERT (sgot != NULL);
2002 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2004 if (elf_hash_table (info)->dynamic_sections_created)
2007 Elf32_External_Dyn *dyncon, *dynconend;
2009 splt = bfd_get_section_by_name (dynobj, ".plt");
2010 BFD_ASSERT (splt != NULL && sdyn != NULL);
2012 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2013 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2014 for (; dyncon < dynconend; dyncon++)
2016 Elf_Internal_Dyn dyn;
2020 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2033 s = bfd_get_section_by_name (output_bfd, name);
2034 BFD_ASSERT (s != NULL);
2035 dyn.d_un.d_ptr = s->vma;
2036 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2040 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2041 BFD_ASSERT (s != NULL);
2042 dyn.d_un.d_val = s->size;
2043 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2047 /* The procedure linkage table relocs (DT_JMPREL) should
2048 not be included in the overall relocs (DT_RELA).
2049 Therefore, we override the DT_RELASZ entry here to
2050 make it not include the JMPREL relocs. Since the
2051 linker script arranges for .rela.plt to follow all
2052 other relocation sections, we don't have to worry
2053 about changing the DT_RELA entry. */
2054 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2056 dyn.d_un.d_val -= s->size;
2057 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2062 /* Fill in the first entry in the procedure linkage table. */
2065 if (CFV4E_FLAG (output_bfd))
2067 memcpy (splt->contents, elf_cfv4e_plt0_entry, CFV4E_PLT_ENTRY_SIZE);
2068 bfd_put_32 (output_bfd,
2069 (sgot->output_section->vma
2070 + sgot->output_offset + 4
2071 - (splt->output_section->vma + 2)),
2072 splt->contents + 2);
2073 bfd_put_32 (output_bfd,
2074 (sgot->output_section->vma
2075 + sgot->output_offset + 8
2076 - (splt->output_section->vma + 10) - 8),
2077 splt->contents + 12);
2078 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2079 = CFV4E_PLT_ENTRY_SIZE;
2081 else if (CPU32_FLAG (output_bfd))
2083 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2084 bfd_put_32 (output_bfd,
2085 (sgot->output_section->vma
2086 + sgot->output_offset + 4
2087 - (splt->output_section->vma + 2)),
2088 splt->contents + 4);
2089 bfd_put_32 (output_bfd,
2090 (sgot->output_section->vma
2091 + sgot->output_offset + 8
2092 - (splt->output_section->vma + 10)),
2093 splt->contents + 12);
2094 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2095 = PLT_CPU32_ENTRY_SIZE;
2099 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2100 bfd_put_32 (output_bfd,
2101 (sgot->output_section->vma
2102 + sgot->output_offset + 4
2103 - (splt->output_section->vma + 2)),
2104 splt->contents + 4);
2105 bfd_put_32 (output_bfd,
2106 (sgot->output_section->vma
2107 + sgot->output_offset + 8
2108 - (splt->output_section->vma + 10)),
2109 splt->contents + 12);
2110 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2116 /* Fill in the first three entries in the global offset table. */
2120 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2122 bfd_put_32 (output_bfd,
2123 sdyn->output_section->vma + sdyn->output_offset,
2125 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2126 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2129 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2134 /* Given a .data section and a .emreloc in-memory section, store
2135 relocation information into the .emreloc section which can be
2136 used at runtime to relocate the section. This is called by the
2137 linker when the --embedded-relocs switch is used. This is called
2138 after the add_symbols entry point has been called for all the
2139 objects, and before the final_link entry point is called. */
2142 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2144 struct bfd_link_info *info;
2149 Elf_Internal_Shdr *symtab_hdr;
2150 Elf_Internal_Sym *isymbuf = NULL;
2151 Elf_Internal_Rela *internal_relocs = NULL;
2152 Elf_Internal_Rela *irel, *irelend;
2156 BFD_ASSERT (! info->relocatable);
2160 if (datasec->reloc_count == 0)
2163 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2165 /* Get a copy of the native relocations. */
2166 internal_relocs = (_bfd_elf_link_read_relocs
2167 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2168 info->keep_memory));
2169 if (internal_relocs == NULL)
2172 amt = (bfd_size_type) datasec->reloc_count * 12;
2173 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2174 if (relsec->contents == NULL)
2177 p = relsec->contents;
2179 irelend = internal_relocs + datasec->reloc_count;
2180 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2182 asection *targetsec;
2184 /* We are going to write a four byte longword into the runtime
2185 reloc section. The longword will be the address in the data
2186 section which must be relocated. It is followed by the name
2187 of the target section NUL-padded or truncated to 8
2190 /* We can only relocate absolute longword relocs at run time. */
2191 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2193 *errmsg = _("unsupported reloc type");
2194 bfd_set_error (bfd_error_bad_value);
2198 /* Get the target section referred to by the reloc. */
2199 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2201 /* A local symbol. */
2202 Elf_Internal_Sym *isym;
2204 /* Read this BFD's local symbols if we haven't done so already. */
2205 if (isymbuf == NULL)
2207 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2208 if (isymbuf == NULL)
2209 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2210 symtab_hdr->sh_info, 0,
2212 if (isymbuf == NULL)
2216 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2217 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2222 struct elf_link_hash_entry *h;
2224 /* An external symbol. */
2225 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2226 h = elf_sym_hashes (abfd)[indx];
2227 BFD_ASSERT (h != NULL);
2228 if (h->root.type == bfd_link_hash_defined
2229 || h->root.type == bfd_link_hash_defweak)
2230 targetsec = h->root.u.def.section;
2235 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2236 memset (p + 4, 0, 8);
2237 if (targetsec != NULL)
2238 strncpy ((char *) p + 4, targetsec->output_section->name, 8);
2241 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2243 if (internal_relocs != NULL
2244 && elf_section_data (datasec)->relocs != internal_relocs)
2245 free (internal_relocs);
2249 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2251 if (internal_relocs != NULL
2252 && elf_section_data (datasec)->relocs != internal_relocs)
2253 free (internal_relocs);
2257 static enum elf_reloc_type_class
2258 elf32_m68k_reloc_type_class (rela)
2259 const Elf_Internal_Rela *rela;
2261 switch ((int) ELF32_R_TYPE (rela->r_info))
2263 case R_68K_RELATIVE:
2264 return reloc_class_relative;
2265 case R_68K_JMP_SLOT:
2266 return reloc_class_plt;
2268 return reloc_class_copy;
2270 return reloc_class_normal;
2274 /* Return address for Ith PLT stub in section PLT, for relocation REL
2275 or (bfd_vma) -1 if it should not be included. */
2278 elf_m68k_plt_sym_val (bfd_vma i, const asection *plt,
2279 const arelent *rel ATTRIBUTE_UNUSED)
2281 if (CPU32_FLAG (plt->owner))
2282 return plt->vma + (i + 1) * PLT_CPU32_ENTRY_SIZE;
2283 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
2286 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2287 #define TARGET_BIG_NAME "elf32-m68k"
2288 #define ELF_MACHINE_CODE EM_68K
2289 #define ELF_MAXPAGESIZE 0x2000
2290 #define elf_backend_create_dynamic_sections \
2291 _bfd_elf_create_dynamic_sections
2292 #define bfd_elf32_bfd_link_hash_table_create \
2293 elf_m68k_link_hash_table_create
2294 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
2296 #define elf_backend_check_relocs elf_m68k_check_relocs
2297 #define elf_backend_adjust_dynamic_symbol \
2298 elf_m68k_adjust_dynamic_symbol
2299 #define elf_backend_size_dynamic_sections \
2300 elf_m68k_size_dynamic_sections
2301 #define elf_backend_relocate_section elf_m68k_relocate_section
2302 #define elf_backend_finish_dynamic_symbol \
2303 elf_m68k_finish_dynamic_symbol
2304 #define elf_backend_finish_dynamic_sections \
2305 elf_m68k_finish_dynamic_sections
2306 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2307 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2308 #define bfd_elf32_bfd_merge_private_bfd_data \
2309 elf32_m68k_merge_private_bfd_data
2310 #define bfd_elf32_bfd_set_private_flags \
2311 elf32_m68k_set_private_flags
2312 #define bfd_elf32_bfd_print_private_bfd_data \
2313 elf32_m68k_print_private_bfd_data
2314 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2315 #define elf_backend_plt_sym_val elf_m68k_plt_sym_val
2317 #define elf_backend_can_gc_sections 1
2318 #define elf_backend_can_refcount 1
2319 #define elf_backend_want_got_plt 1
2320 #define elf_backend_plt_readonly 1
2321 #define elf_backend_want_plt_sym 0
2322 #define elf_backend_got_header_size 12
2323 #define elf_backend_rela_normal 1
2325 #include "elf32-target.h"