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)
1193 if ((s->flags & SEC_LINKER_CREATED) == 0)
1196 /* It's OK to base decisions on the section name, because none
1197 of the dynobj section names depend upon the input files. */
1198 name = bfd_get_section_name (dynobj, s);
1200 if (strcmp (name, ".plt") == 0)
1202 /* Remember whether there is a PLT. */
1205 else if (strncmp (name, ".rela", 5) == 0)
1211 /* We use the reloc_count field as a counter if we need
1212 to copy relocs into the output file. */
1216 else if (strncmp (name, ".got", 4) != 0
1217 && strcmp (name, ".dynbss") != 0)
1219 /* It's not one of our sections, so don't allocate space. */
1225 /* If we don't need this section, strip it from the
1226 output file. This is mostly to handle .rela.bss and
1227 .rela.plt. We must create both sections in
1228 create_dynamic_sections, because they must be created
1229 before the linker maps input sections to output
1230 sections. The linker does that before
1231 adjust_dynamic_symbol is called, and it is that
1232 function which decides whether anything needs to go
1233 into these sections. */
1234 s->flags |= SEC_EXCLUDE;
1238 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1241 /* Allocate memory for the section contents. */
1242 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1243 Unused entries should be reclaimed before the section's contents
1244 are written out, but at the moment this does not happen. Thus in
1245 order to prevent writing out garbage, we initialise the section's
1246 contents to zero. */
1247 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1248 if (s->contents == NULL)
1252 if (elf_hash_table (info)->dynamic_sections_created)
1254 /* Add some entries to the .dynamic section. We fill in the
1255 values later, in elf_m68k_finish_dynamic_sections, but we
1256 must add the entries now so that we get the correct size for
1257 the .dynamic section. The DT_DEBUG entry is filled in by the
1258 dynamic linker and used by the debugger. */
1259 #define add_dynamic_entry(TAG, VAL) \
1260 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1264 if (!add_dynamic_entry (DT_DEBUG, 0))
1270 if (!add_dynamic_entry (DT_PLTGOT, 0)
1271 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1272 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1273 || !add_dynamic_entry (DT_JMPREL, 0))
1279 if (!add_dynamic_entry (DT_RELA, 0)
1280 || !add_dynamic_entry (DT_RELASZ, 0)
1281 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1285 if ((info->flags & DF_TEXTREL) != 0)
1287 if (!add_dynamic_entry (DT_TEXTREL, 0))
1291 #undef add_dynamic_entry
1296 /* This function is called via elf_link_hash_traverse if we are
1297 creating a shared object. In the -Bsymbolic case it discards the
1298 space allocated to copy PC relative relocs against symbols which
1299 are defined in regular objects. For the normal shared case, it
1300 discards space for pc-relative relocs that have become local due to
1301 symbol visibility changes. We allocated space for them in the
1302 check_relocs routine, but we won't fill them in in the
1303 relocate_section routine.
1305 We also check whether any of the remaining relocations apply
1306 against a readonly section, and set the DF_TEXTREL flag in this
1310 elf_m68k_discard_copies (h, inf)
1311 struct elf_link_hash_entry *h;
1314 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1315 struct elf_m68k_pcrel_relocs_copied *s;
1317 if (h->root.type == bfd_link_hash_warning)
1318 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1322 && !h->forced_local))
1324 if ((info->flags & DF_TEXTREL) == 0)
1326 /* Look for relocations against read-only sections. */
1327 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1330 if ((s->section->flags & SEC_READONLY) != 0)
1332 info->flags |= DF_TEXTREL;
1340 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1343 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1348 /* Relocate an M68K ELF section. */
1351 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1352 contents, relocs, local_syms, local_sections)
1354 struct bfd_link_info *info;
1356 asection *input_section;
1358 Elf_Internal_Rela *relocs;
1359 Elf_Internal_Sym *local_syms;
1360 asection **local_sections;
1363 Elf_Internal_Shdr *symtab_hdr;
1364 struct elf_link_hash_entry **sym_hashes;
1365 bfd_vma *local_got_offsets;
1369 Elf_Internal_Rela *rel;
1370 Elf_Internal_Rela *relend;
1372 if (info->relocatable)
1375 dynobj = elf_hash_table (info)->dynobj;
1376 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1377 sym_hashes = elf_sym_hashes (input_bfd);
1378 local_got_offsets = elf_local_got_offsets (input_bfd);
1385 relend = relocs + input_section->reloc_count;
1386 for (; rel < relend; rel++)
1389 reloc_howto_type *howto;
1390 unsigned long r_symndx;
1391 struct elf_link_hash_entry *h;
1392 Elf_Internal_Sym *sym;
1395 bfd_boolean unresolved_reloc;
1396 bfd_reloc_status_type r;
1398 r_type = ELF32_R_TYPE (rel->r_info);
1399 if (r_type < 0 || r_type >= (int) R_68K_max)
1401 bfd_set_error (bfd_error_bad_value);
1404 howto = howto_table + r_type;
1406 r_symndx = ELF32_R_SYM (rel->r_info);
1411 unresolved_reloc = FALSE;
1413 if (r_symndx < symtab_hdr->sh_info)
1415 sym = local_syms + r_symndx;
1416 sec = local_sections[r_symndx];
1417 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1423 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1424 r_symndx, symtab_hdr, sym_hashes,
1426 unresolved_reloc, warned);
1434 /* Relocation is to the address of the entry for this symbol
1435 in the global offset table. */
1437 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1443 /* Relocation is the offset of the entry for this symbol in
1444 the global offset table. */
1451 sgot = bfd_get_section_by_name (dynobj, ".got");
1452 BFD_ASSERT (sgot != NULL);
1459 off = h->got.offset;
1460 BFD_ASSERT (off != (bfd_vma) -1);
1462 dyn = elf_hash_table (info)->dynamic_sections_created;
1463 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1470 /* This is actually a static link, or it is a
1471 -Bsymbolic link and the symbol is defined
1472 locally, or the symbol was forced to be local
1473 because of a version file.. We must initialize
1474 this entry in the global offset table. Since
1475 the offset must always be a multiple of 4, we
1476 use the least significant bit to record whether
1477 we have initialized it already.
1479 When doing a dynamic link, we create a .rela.got
1480 relocation entry to initialize the value. This
1481 is done in the finish_dynamic_symbol routine. */
1486 bfd_put_32 (output_bfd, relocation,
1487 sgot->contents + off);
1492 unresolved_reloc = FALSE;
1496 BFD_ASSERT (local_got_offsets != NULL
1497 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1499 off = local_got_offsets[r_symndx];
1501 /* The offset must always be a multiple of 4. We use
1502 the least significant bit to record whether we have
1503 already generated the necessary reloc. */
1508 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1513 Elf_Internal_Rela outrel;
1516 s = bfd_get_section_by_name (dynobj, ".rela.got");
1517 BFD_ASSERT (s != NULL);
1519 outrel.r_offset = (sgot->output_section->vma
1520 + sgot->output_offset
1522 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1523 outrel.r_addend = relocation;
1525 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1526 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1529 local_got_offsets[r_symndx] |= 1;
1533 relocation = sgot->output_offset + off;
1534 if (r_type == R_68K_GOT8O
1535 || r_type == R_68K_GOT16O
1536 || r_type == R_68K_GOT32O)
1538 /* This relocation does not use the addend. */
1542 relocation += sgot->output_section->vma;
1549 /* Relocation is to the entry for this symbol in the
1550 procedure linkage table. */
1552 /* Resolve a PLTxx reloc against a local symbol directly,
1553 without using the procedure linkage table. */
1557 if (h->plt.offset == (bfd_vma) -1
1558 || !elf_hash_table (info)->dynamic_sections_created)
1560 /* We didn't make a PLT entry for this symbol. This
1561 happens when statically linking PIC code, or when
1562 using -Bsymbolic. */
1568 splt = bfd_get_section_by_name (dynobj, ".plt");
1569 BFD_ASSERT (splt != NULL);
1572 relocation = (splt->output_section->vma
1573 + splt->output_offset
1575 unresolved_reloc = FALSE;
1581 /* Relocation is the offset of the entry for this symbol in
1582 the procedure linkage table. */
1583 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1587 splt = bfd_get_section_by_name (dynobj, ".plt");
1588 BFD_ASSERT (splt != NULL);
1591 relocation = h->plt.offset;
1592 unresolved_reloc = FALSE;
1594 /* This relocation does not use the addend. */
1604 && h->forced_local))
1612 && (input_section->flags & SEC_ALLOC) != 0
1614 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1615 || h->root.type != bfd_link_hash_undefweak)
1616 && ((r_type != R_68K_PC8
1617 && r_type != R_68K_PC16
1618 && r_type != R_68K_PC32)
1622 || !h->def_regular))))
1624 Elf_Internal_Rela outrel;
1626 bfd_boolean skip, relocate;
1628 /* When generating a shared object, these relocations
1629 are copied into the output file to be resolved at run
1636 _bfd_elf_section_offset (output_bfd, info, input_section,
1638 if (outrel.r_offset == (bfd_vma) -1)
1640 else if (outrel.r_offset == (bfd_vma) -2)
1641 skip = TRUE, relocate = TRUE;
1642 outrel.r_offset += (input_section->output_section->vma
1643 + input_section->output_offset);
1646 memset (&outrel, 0, sizeof outrel);
1649 && (r_type == R_68K_PC8
1650 || r_type == R_68K_PC16
1651 || r_type == R_68K_PC32
1654 || !h->def_regular))
1656 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1657 outrel.r_addend = rel->r_addend;
1661 /* This symbol is local, or marked to become local. */
1662 if (r_type == R_68K_32)
1665 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1666 outrel.r_addend = relocation + rel->r_addend;
1672 if (bfd_is_abs_section (sec))
1674 else if (sec == NULL || sec->owner == NULL)
1676 bfd_set_error (bfd_error_bad_value);
1683 osec = sec->output_section;
1684 indx = elf_section_data (osec)->dynindx;
1685 BFD_ASSERT (indx > 0);
1688 outrel.r_info = ELF32_R_INFO (indx, r_type);
1689 outrel.r_addend = relocation + rel->r_addend;
1693 sreloc = elf_section_data (input_section)->sreloc;
1697 loc = sreloc->contents;
1698 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1699 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1701 /* This reloc will be computed at runtime, so there's no
1702 need to do anything now, except for R_68K_32
1703 relocations that have been turned into
1711 case R_68K_GNU_VTINHERIT:
1712 case R_68K_GNU_VTENTRY:
1713 /* These are no-ops in the end. */
1720 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1721 because such sections are not SEC_ALLOC and thus ld.so will
1722 not process them. */
1723 if (unresolved_reloc
1724 && !((input_section->flags & SEC_DEBUGGING) != 0
1727 (*_bfd_error_handler)
1728 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
1731 (long) rel->r_offset,
1732 h->root.root.string);
1736 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1737 contents, rel->r_offset,
1738 relocation, rel->r_addend);
1740 if (r != bfd_reloc_ok)
1745 name = h->root.root.string;
1748 name = bfd_elf_string_from_elf_section (input_bfd,
1749 symtab_hdr->sh_link,
1754 name = bfd_section_name (input_bfd, sec);
1757 if (r == bfd_reloc_overflow)
1759 if (!(info->callbacks->reloc_overflow
1760 (info, (h ? &h->root : NULL), name, howto->name,
1761 (bfd_vma) 0, input_bfd, input_section,
1767 (*_bfd_error_handler)
1768 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
1769 input_bfd, input_section,
1770 (long) rel->r_offset, name, (int) r);
1779 /* Finish up dynamic symbol handling. We set the contents of various
1780 dynamic sections here. */
1783 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1785 struct bfd_link_info *info;
1786 struct elf_link_hash_entry *h;
1787 Elf_Internal_Sym *sym;
1790 int plt_off1, plt_off2, plt_off3;
1792 dynobj = elf_hash_table (info)->dynobj;
1794 if (h->plt.offset != (bfd_vma) -1)
1801 Elf_Internal_Rela rela;
1804 /* This symbol has an entry in the procedure linkage table. Set
1807 BFD_ASSERT (h->dynindx != -1);
1809 splt = bfd_get_section_by_name (dynobj, ".plt");
1810 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1811 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1812 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1814 /* Get the index in the procedure linkage table which
1815 corresponds to this symbol. This is the index of this symbol
1816 in all the symbols for which we are making plt entries. The
1817 first entry in the procedure linkage table is reserved. */
1818 if (CPU32_FLAG (output_bfd))
1819 plt_index = (h->plt.offset / PLT_CPU32_ENTRY_SIZE) - 1;
1820 else if (CFV4E_FLAG (output_bfd))
1821 plt_index = (h->plt.offset / CFV4E_PLT_ENTRY_SIZE) - 1;
1823 plt_index = (h->plt.offset / PLT_ENTRY_SIZE) - 1;
1825 /* Get the offset into the .got table of the entry that
1826 corresponds to this function. Each .got entry is 4 bytes.
1827 The first three are reserved. */
1828 got_offset = (plt_index + 3) * 4;
1830 if (CPU32_FLAG (output_bfd))
1832 /* Fill in the entry in the procedure linkage table. */
1833 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1834 PLT_CPU32_ENTRY_SIZE);
1839 else if (CFV4E_FLAG (output_bfd))
1841 memcpy (splt->contents + h->plt.offset, elf_cfv4e_plt_entry,
1842 CFV4E_PLT_ENTRY_SIZE);
1849 /* Fill in the entry in the procedure linkage table. */
1850 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1857 /* The offset is relative to the first extension word. */
1858 bfd_put_32 (output_bfd,
1859 sgot->output_section->vma
1860 + sgot->output_offset
1862 - (splt->output_section->vma
1864 + CFV4E_FLAG (output_bfd) ? 8 : 2),
1865 splt->contents + h->plt.offset + plt_off1);
1867 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1868 splt->contents + h->plt.offset + plt_off2);
1869 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1870 splt->contents + h->plt.offset + plt_off3);
1872 /* Fill in the entry in the global offset table. */
1873 bfd_put_32 (output_bfd,
1874 (splt->output_section->vma
1875 + splt->output_offset
1877 + CFV4E_FLAG (output_bfd) ? 12 : 8),
1878 sgot->contents + got_offset);
1880 /* Fill in the entry in the .rela.plt section. */
1881 rela.r_offset = (sgot->output_section->vma
1882 + sgot->output_offset
1884 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1886 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1887 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1889 if (!h->def_regular)
1891 /* Mark the symbol as undefined, rather than as defined in
1892 the .plt section. Leave the value alone. */
1893 sym->st_shndx = SHN_UNDEF;
1897 if (h->got.offset != (bfd_vma) -1)
1901 Elf_Internal_Rela rela;
1904 /* This symbol has an entry in the global offset table. Set it
1907 sgot = bfd_get_section_by_name (dynobj, ".got");
1908 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1909 BFD_ASSERT (sgot != NULL && srela != NULL);
1911 rela.r_offset = (sgot->output_section->vma
1912 + sgot->output_offset
1913 + (h->got.offset &~ (bfd_vma) 1));
1915 /* If this is a -Bsymbolic link, and the symbol is defined
1916 locally, we just want to emit a RELATIVE reloc. Likewise if
1917 the symbol was forced to be local because of a version file.
1918 The entry in the global offset table will already have been
1919 initialized in the relocate_section function. */
1926 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1927 rela.r_addend = bfd_get_signed_32 (output_bfd,
1929 + (h->got.offset &~ (bfd_vma) 1)));
1933 bfd_put_32 (output_bfd, (bfd_vma) 0,
1934 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1935 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1939 loc = srela->contents;
1940 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1941 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1947 Elf_Internal_Rela rela;
1950 /* This symbol needs a copy reloc. Set it up. */
1952 BFD_ASSERT (h->dynindx != -1
1953 && (h->root.type == bfd_link_hash_defined
1954 || h->root.type == bfd_link_hash_defweak));
1956 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1958 BFD_ASSERT (s != NULL);
1960 rela.r_offset = (h->root.u.def.value
1961 + h->root.u.def.section->output_section->vma
1962 + h->root.u.def.section->output_offset);
1963 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1965 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1966 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1969 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1970 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1971 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1972 sym->st_shndx = SHN_ABS;
1977 /* Finish up the dynamic sections. */
1980 elf_m68k_finish_dynamic_sections (output_bfd, info)
1982 struct bfd_link_info *info;
1988 dynobj = elf_hash_table (info)->dynobj;
1990 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1991 BFD_ASSERT (sgot != NULL);
1992 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1994 if (elf_hash_table (info)->dynamic_sections_created)
1997 Elf32_External_Dyn *dyncon, *dynconend;
1999 splt = bfd_get_section_by_name (dynobj, ".plt");
2000 BFD_ASSERT (splt != NULL && sdyn != NULL);
2002 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2003 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2004 for (; dyncon < dynconend; dyncon++)
2006 Elf_Internal_Dyn dyn;
2010 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2023 s = bfd_get_section_by_name (output_bfd, name);
2024 BFD_ASSERT (s != NULL);
2025 dyn.d_un.d_ptr = s->vma;
2026 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2030 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2031 BFD_ASSERT (s != NULL);
2032 dyn.d_un.d_val = s->size;
2033 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2037 /* The procedure linkage table relocs (DT_JMPREL) should
2038 not be included in the overall relocs (DT_RELA).
2039 Therefore, we override the DT_RELASZ entry here to
2040 make it not include the JMPREL relocs. Since the
2041 linker script arranges for .rela.plt to follow all
2042 other relocation sections, we don't have to worry
2043 about changing the DT_RELA entry. */
2044 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2046 dyn.d_un.d_val -= s->size;
2047 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2052 /* Fill in the first entry in the procedure linkage table. */
2055 if (CFV4E_FLAG (output_bfd))
2057 memcpy (splt->contents, elf_cfv4e_plt0_entry, CFV4E_PLT_ENTRY_SIZE);
2058 bfd_put_32 (output_bfd,
2059 (sgot->output_section->vma
2060 + sgot->output_offset + 4
2061 - (splt->output_section->vma + 2)),
2062 splt->contents + 2);
2063 bfd_put_32 (output_bfd,
2064 (sgot->output_section->vma
2065 + sgot->output_offset + 8
2066 - (splt->output_section->vma + 10) - 8),
2067 splt->contents + 12);
2068 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2069 = CFV4E_PLT_ENTRY_SIZE;
2071 else if (CPU32_FLAG (output_bfd))
2073 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2074 bfd_put_32 (output_bfd,
2075 (sgot->output_section->vma
2076 + sgot->output_offset + 4
2077 - (splt->output_section->vma + 2)),
2078 splt->contents + 4);
2079 bfd_put_32 (output_bfd,
2080 (sgot->output_section->vma
2081 + sgot->output_offset + 8
2082 - (splt->output_section->vma + 10)),
2083 splt->contents + 12);
2084 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2085 = PLT_CPU32_ENTRY_SIZE;
2089 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2090 bfd_put_32 (output_bfd,
2091 (sgot->output_section->vma
2092 + sgot->output_offset + 4
2093 - (splt->output_section->vma + 2)),
2094 splt->contents + 4);
2095 bfd_put_32 (output_bfd,
2096 (sgot->output_section->vma
2097 + sgot->output_offset + 8
2098 - (splt->output_section->vma + 10)),
2099 splt->contents + 12);
2100 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2106 /* Fill in the first three entries in the global offset table. */
2110 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2112 bfd_put_32 (output_bfd,
2113 sdyn->output_section->vma + sdyn->output_offset,
2115 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2116 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2119 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2124 /* Given a .data section and a .emreloc in-memory section, store
2125 relocation information into the .emreloc section which can be
2126 used at runtime to relocate the section. This is called by the
2127 linker when the --embedded-relocs switch is used. This is called
2128 after the add_symbols entry point has been called for all the
2129 objects, and before the final_link entry point is called. */
2132 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2134 struct bfd_link_info *info;
2139 Elf_Internal_Shdr *symtab_hdr;
2140 Elf_Internal_Sym *isymbuf = NULL;
2141 Elf_Internal_Rela *internal_relocs = NULL;
2142 Elf_Internal_Rela *irel, *irelend;
2146 BFD_ASSERT (! info->relocatable);
2150 if (datasec->reloc_count == 0)
2153 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2155 /* Get a copy of the native relocations. */
2156 internal_relocs = (_bfd_elf_link_read_relocs
2157 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2158 info->keep_memory));
2159 if (internal_relocs == NULL)
2162 amt = (bfd_size_type) datasec->reloc_count * 12;
2163 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2164 if (relsec->contents == NULL)
2167 p = relsec->contents;
2169 irelend = internal_relocs + datasec->reloc_count;
2170 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2172 asection *targetsec;
2174 /* We are going to write a four byte longword into the runtime
2175 reloc section. The longword will be the address in the data
2176 section which must be relocated. It is followed by the name
2177 of the target section NUL-padded or truncated to 8
2180 /* We can only relocate absolute longword relocs at run time. */
2181 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2183 *errmsg = _("unsupported reloc type");
2184 bfd_set_error (bfd_error_bad_value);
2188 /* Get the target section referred to by the reloc. */
2189 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2191 /* A local symbol. */
2192 Elf_Internal_Sym *isym;
2194 /* Read this BFD's local symbols if we haven't done so already. */
2195 if (isymbuf == NULL)
2197 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2198 if (isymbuf == NULL)
2199 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2200 symtab_hdr->sh_info, 0,
2202 if (isymbuf == NULL)
2206 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2207 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2212 struct elf_link_hash_entry *h;
2214 /* An external symbol. */
2215 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2216 h = elf_sym_hashes (abfd)[indx];
2217 BFD_ASSERT (h != NULL);
2218 if (h->root.type == bfd_link_hash_defined
2219 || h->root.type == bfd_link_hash_defweak)
2220 targetsec = h->root.u.def.section;
2225 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2226 memset (p + 4, 0, 8);
2227 if (targetsec != NULL)
2228 strncpy ((char *) p + 4, targetsec->output_section->name, 8);
2231 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2233 if (internal_relocs != NULL
2234 && elf_section_data (datasec)->relocs != internal_relocs)
2235 free (internal_relocs);
2239 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2241 if (internal_relocs != NULL
2242 && elf_section_data (datasec)->relocs != internal_relocs)
2243 free (internal_relocs);
2247 static enum elf_reloc_type_class
2248 elf32_m68k_reloc_type_class (rela)
2249 const Elf_Internal_Rela *rela;
2251 switch ((int) ELF32_R_TYPE (rela->r_info))
2253 case R_68K_RELATIVE:
2254 return reloc_class_relative;
2255 case R_68K_JMP_SLOT:
2256 return reloc_class_plt;
2258 return reloc_class_copy;
2260 return reloc_class_normal;
2264 /* Return address for Ith PLT stub in section PLT, for relocation REL
2265 or (bfd_vma) -1 if it should not be included. */
2268 elf_m68k_plt_sym_val (bfd_vma i, const asection *plt,
2269 const arelent *rel ATTRIBUTE_UNUSED)
2271 if (CPU32_FLAG (plt->owner))
2272 return plt->vma + (i + 1) * PLT_CPU32_ENTRY_SIZE;
2273 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
2276 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2277 #define TARGET_BIG_NAME "elf32-m68k"
2278 #define ELF_MACHINE_CODE EM_68K
2279 #define ELF_MAXPAGESIZE 0x2000
2280 #define elf_backend_create_dynamic_sections \
2281 _bfd_elf_create_dynamic_sections
2282 #define bfd_elf32_bfd_link_hash_table_create \
2283 elf_m68k_link_hash_table_create
2284 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
2286 #define elf_backend_check_relocs elf_m68k_check_relocs
2287 #define elf_backend_adjust_dynamic_symbol \
2288 elf_m68k_adjust_dynamic_symbol
2289 #define elf_backend_size_dynamic_sections \
2290 elf_m68k_size_dynamic_sections
2291 #define elf_backend_relocate_section elf_m68k_relocate_section
2292 #define elf_backend_finish_dynamic_symbol \
2293 elf_m68k_finish_dynamic_symbol
2294 #define elf_backend_finish_dynamic_sections \
2295 elf_m68k_finish_dynamic_sections
2296 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2297 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2298 #define bfd_elf32_bfd_merge_private_bfd_data \
2299 elf32_m68k_merge_private_bfd_data
2300 #define bfd_elf32_bfd_set_private_flags \
2301 elf32_m68k_set_private_flags
2302 #define bfd_elf32_bfd_print_private_bfd_data \
2303 elf32_m68k_print_private_bfd_data
2304 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2305 #define elf_backend_plt_sym_val elf_m68k_plt_sym_val
2307 #define elf_backend_can_gc_sections 1
2308 #define elf_backend_can_refcount 1
2309 #define elf_backend_want_got_plt 1
2310 #define elf_backend_plt_readonly 1
2311 #define elf_backend_want_plt_sym 0
2312 #define elf_backend_got_header_size 12
2313 #define elf_backend_rela_normal 1
2315 #include "elf32-target.h"