1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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
184 /* end code generated by elf.el */
186 /* Functions for the m68k ELF linker. */
188 /* The name of the dynamic interpreter. This is put in the .interp
191 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
193 /* The size in bytes of an entry in the procedure linkage table. */
195 #define PLT_ENTRY_SIZE 20
197 /* The first entry in a procedure linkage table looks like this. See
198 the SVR4 ABI m68k supplement to see how this works. */
200 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
202 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
203 0, 0, 0, 0, /* replaced with offset to .got + 4. */
204 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
205 0, 0, 0, 0, /* replaced with offset to .got + 8. */
206 0, 0, 0, 0 /* pad out to 20 bytes. */
209 /* Subsequent entries in a procedure linkage table look like this. */
211 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
213 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
214 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
215 0x2f, 0x3c, /* move.l #offset,-(%sp) */
216 0, 0, 0, 0, /* replaced with offset into relocation table. */
217 0x60, 0xff, /* bra.l .plt */
218 0, 0, 0, 0 /* replaced with offset to start of .plt. */
221 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
223 #define PLT_CPU32_ENTRY_SIZE 24
224 /* Procedure linkage table entries for the cpu32 */
225 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
227 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
228 0, 0, 0, 0, /* replaced with offset to .got + 4. */
229 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
230 0, 0, 0, 0, /* replace with offset to .got +8. */
231 0x4e, 0xd1, /* jmp %a1@ */
232 0, 0, 0, 0, /* pad out to 24 bytes. */
236 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
238 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
239 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
240 0x4e, 0xd1, /* jmp %a1@ */
241 0x2f, 0x3c, /* move.l #offset,-(%sp) */
242 0, 0, 0, 0, /* replaced with offset into relocation table. */
243 0x60, 0xff, /* bra.l .plt */
244 0, 0, 0, 0, /* replaced with offset to start of .plt. */
248 /* The m68k linker needs to keep track of the number of relocs that it
249 decides to copy in check_relocs for each symbol. This is so that it
250 can discard PC relative relocs if it doesn't need them when linking
251 with -Bsymbolic. We store the information in a field extending the
252 regular ELF linker hash table. */
254 /* This structure keeps track of the number of PC relative relocs we have
255 copied for a given symbol. */
257 struct elf_m68k_pcrel_relocs_copied
260 struct elf_m68k_pcrel_relocs_copied *next;
261 /* A section in dynobj. */
263 /* Number of relocs copied in this section. */
267 /* m68k ELF linker hash entry. */
269 struct elf_m68k_link_hash_entry
271 struct elf_link_hash_entry root;
273 /* Number of PC relative relocs copied for this symbol. */
274 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
277 #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent))
279 /* m68k ELF linker hash table. */
281 struct elf_m68k_link_hash_table
283 struct elf_link_hash_table root;
285 /* Small local sym to section mapping cache. */
286 struct sym_sec_cache sym_sec;
289 /* Get the m68k ELF linker hash table from a link_info structure. */
291 #define elf_m68k_hash_table(p) \
292 ((struct elf_m68k_link_hash_table *) (p)->hash)
294 /* Create an entry in an m68k ELF linker hash table. */
296 static struct bfd_hash_entry *
297 elf_m68k_link_hash_newfunc (entry, table, string)
298 struct bfd_hash_entry *entry;
299 struct bfd_hash_table *table;
302 struct bfd_hash_entry *ret = entry;
304 /* Allocate the structure if it has not already been allocated by a
307 ret = bfd_hash_allocate (table,
308 sizeof (struct elf_m68k_link_hash_entry));
312 /* Call the allocation method of the superclass. */
313 ret = _bfd_elf_link_hash_newfunc (ret, table, string);
315 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL;
320 /* Create an m68k ELF linker hash table. */
322 static struct bfd_link_hash_table *
323 elf_m68k_link_hash_table_create (abfd)
326 struct elf_m68k_link_hash_table *ret;
327 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table);
329 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt);
330 if (ret == (struct elf_m68k_link_hash_table *) NULL)
333 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
334 elf_m68k_link_hash_newfunc))
340 ret->sym_sec.abfd = NULL;
342 return &ret->root.root;
345 /* Keep m68k-specific flags in the ELF header */
347 elf32_m68k_set_private_flags (abfd, flags)
351 elf_elfheader (abfd)->e_flags = flags;
352 elf_flags_init (abfd) = TRUE;
356 /* Merge backend specific data from an object file to the output
357 object file when linking. */
359 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
366 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
367 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
370 in_flags = elf_elfheader (ibfd)->e_flags;
371 out_flags = elf_elfheader (obfd)->e_flags;
373 if (!elf_flags_init (obfd))
375 elf_flags_init (obfd) = TRUE;
376 elf_elfheader (obfd)->e_flags = in_flags;
382 /* Display the flags field */
384 elf32_m68k_print_private_bfd_data (abfd, ptr)
388 FILE *file = (FILE *) ptr;
390 BFD_ASSERT (abfd != NULL && ptr != NULL);
392 /* Print normal ELF private data. */
393 _bfd_elf_print_private_bfd_data (abfd, ptr);
395 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
397 /* xgettext:c-format */
398 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
400 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
401 fprintf (file, _(" [cpu32]"));
403 if (elf_elfheader (abfd)->e_flags & EF_M68000)
404 fprintf (file, _(" [m68000]"));
410 /* Look through the relocs for a section during the first phase, and
411 allocate space in the global offset table or procedure linkage
415 elf_m68k_check_relocs (abfd, info, sec, relocs)
417 struct bfd_link_info *info;
419 const Elf_Internal_Rela *relocs;
422 Elf_Internal_Shdr *symtab_hdr;
423 struct elf_link_hash_entry **sym_hashes;
424 bfd_signed_vma *local_got_refcounts;
425 const Elf_Internal_Rela *rel;
426 const Elf_Internal_Rela *rel_end;
431 if (info->relocateable)
434 dynobj = elf_hash_table (info)->dynobj;
435 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
436 sym_hashes = elf_sym_hashes (abfd);
437 local_got_refcounts = elf_local_got_refcounts (abfd);
443 rel_end = relocs + sec->reloc_count;
444 for (rel = relocs; rel < rel_end; rel++)
446 unsigned long r_symndx;
447 struct elf_link_hash_entry *h;
449 r_symndx = ELF32_R_SYM (rel->r_info);
451 if (r_symndx < symtab_hdr->sh_info)
454 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
456 switch (ELF32_R_TYPE (rel->r_info))
462 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
468 /* This symbol requires a global offset table entry. */
472 /* Create the .got section. */
473 elf_hash_table (info)->dynobj = dynobj = abfd;
474 if (!_bfd_elf_create_got_section (dynobj, info))
480 sgot = bfd_get_section_by_name (dynobj, ".got");
481 BFD_ASSERT (sgot != NULL);
485 && (h != NULL || info->shared))
487 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
490 srelgot = bfd_make_section (dynobj, ".rela.got");
492 || !bfd_set_section_flags (dynobj, srelgot,
499 || !bfd_set_section_alignment (dynobj, srelgot, 2))
506 if (h->got.refcount == 0)
508 /* Make sure this symbol is output as a dynamic symbol. */
510 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
512 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
516 /* Allocate space in the .got section. */
517 sgot->_raw_size += 4;
518 /* Allocate relocation space. */
519 srelgot->_raw_size += sizeof (Elf32_External_Rela);
525 /* This is a global offset table entry for a local symbol. */
526 if (local_got_refcounts == NULL)
530 size = symtab_hdr->sh_info;
531 size *= sizeof (bfd_signed_vma);
532 local_got_refcounts = ((bfd_signed_vma *)
533 bfd_zalloc (abfd, size));
534 if (local_got_refcounts == NULL)
536 elf_local_got_refcounts (abfd) = local_got_refcounts;
538 if (local_got_refcounts[r_symndx] == 0)
540 sgot->_raw_size += 4;
543 /* If we are generating a shared object, we need to
544 output a R_68K_RELATIVE reloc so that the dynamic
545 linker can adjust this GOT entry. */
546 srelgot->_raw_size += sizeof (Elf32_External_Rela);
549 local_got_refcounts[r_symndx]++;
556 /* This symbol requires a procedure linkage table entry. We
557 actually build the entry in adjust_dynamic_symbol,
558 because this might be a case of linking PIC code which is
559 never referenced by a dynamic object, in which case we
560 don't need to generate a procedure linkage table entry
563 /* If this is a local symbol, we resolve it directly without
564 creating a procedure linkage table entry. */
568 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
575 /* This symbol requires a procedure linkage table entry. */
579 /* It does not make sense to have this relocation for a
580 local symbol. FIXME: does it? How to handle it if
581 it does make sense? */
582 bfd_set_error (bfd_error_bad_value);
586 /* Make sure this symbol is output as a dynamic symbol. */
588 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
590 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
594 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
601 /* If we are creating a shared library and this is not a local
602 symbol, we need to copy the reloc into the shared library.
603 However when linking with -Bsymbolic and this is a global
604 symbol which is defined in an object we are including in the
605 link (i.e., DEF_REGULAR is set), then we can resolve the
606 reloc directly. At this point we have not seen all the input
607 files, so it is possible that DEF_REGULAR is not set now but
608 will be set later (it is never cleared). We account for that
609 possibility below by storing information in the
610 pcrel_relocs_copied field of the hash table entry. */
612 && (sec->flags & SEC_ALLOC) != 0
615 || h->root.type == bfd_link_hash_defweak
616 || (h->elf_link_hash_flags
617 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
621 /* Make sure a plt entry is created for this symbol if
622 it turns out to be a function defined by a dynamic
634 /* Make sure a plt entry is created for this symbol if it
635 turns out to be a function defined by a dynamic object. */
639 /* If we are creating a shared library, we need to copy the
640 reloc into the shared library. */
642 && (sec->flags & SEC_ALLOC) != 0)
644 /* When creating a shared object, we must copy these
645 reloc types into the output file. We create a reloc
646 section in dynobj and make room for this reloc. */
651 name = (bfd_elf_string_from_elf_section
653 elf_elfheader (abfd)->e_shstrndx,
654 elf_section_data (sec)->rel_hdr.sh_name));
658 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
659 && strcmp (bfd_get_section_name (abfd, sec),
662 sreloc = bfd_get_section_by_name (dynobj, name);
665 sreloc = bfd_make_section (dynobj, name);
667 || !bfd_set_section_flags (dynobj, sreloc,
674 || !bfd_set_section_alignment (dynobj, sreloc, 2))
679 if (sec->flags & SEC_READONLY
680 /* Don't set DF_TEXTREL yet for PC relative
681 relocations, they might be discarded later. */
682 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8
683 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
684 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32))
685 info->flags |= DF_TEXTREL;
687 sreloc->_raw_size += sizeof (Elf32_External_Rela);
689 /* We count the number of PC relative relocations we have
690 entered for this symbol, so that we can discard them
691 again if, in the -Bsymbolic case, the symbol is later
692 defined by a regular object, or, in the normal shared
693 case, the symbol is forced to be local. Note that this
694 function is only called if we are using an m68kelf linker
695 hash table, which means that h is really a pointer to an
696 elf_m68k_link_hash_entry. */
697 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8
698 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
699 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
701 struct elf_m68k_pcrel_relocs_copied *p;
702 struct elf_m68k_pcrel_relocs_copied **head;
706 struct elf_m68k_link_hash_entry *eh
707 = elf_m68k_hash_entry (h);
708 head = &eh->pcrel_relocs_copied;
713 s = (bfd_section_from_r_symndx
714 (abfd, &elf_m68k_hash_table (info)->sym_sec,
719 head = ((struct elf_m68k_pcrel_relocs_copied **)
720 &elf_section_data (s)->local_dynrel);
723 for (p = *head; p != NULL; p = p->next)
724 if (p->section == sreloc)
729 p = ((struct elf_m68k_pcrel_relocs_copied *)
730 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
745 /* This relocation describes the C++ object vtable hierarchy.
746 Reconstruct it for later use during GC. */
747 case R_68K_GNU_VTINHERIT:
748 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
752 /* This relocation describes which C++ vtable entries are actually
753 used. Record for later use during GC. */
754 case R_68K_GNU_VTENTRY:
755 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
767 /* Return the section that should be marked against GC for a given
771 elf_m68k_gc_mark_hook (sec, info, rel, h, sym)
773 struct bfd_link_info *info ATTRIBUTE_UNUSED;
774 Elf_Internal_Rela *rel;
775 struct elf_link_hash_entry *h;
776 Elf_Internal_Sym *sym;
780 switch (ELF32_R_TYPE (rel->r_info))
782 case R_68K_GNU_VTINHERIT:
783 case R_68K_GNU_VTENTRY:
787 switch (h->root.type)
792 case bfd_link_hash_defined:
793 case bfd_link_hash_defweak:
794 return h->root.u.def.section;
796 case bfd_link_hash_common:
797 return h->root.u.c.p->section;
802 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
807 /* Update the got entry reference counts for the section being removed. */
810 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
812 struct bfd_link_info *info;
814 const Elf_Internal_Rela *relocs;
816 Elf_Internal_Shdr *symtab_hdr;
817 struct elf_link_hash_entry **sym_hashes;
818 bfd_signed_vma *local_got_refcounts;
819 const Elf_Internal_Rela *rel, *relend;
820 unsigned long r_symndx;
821 struct elf_link_hash_entry *h;
826 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
827 sym_hashes = elf_sym_hashes (abfd);
828 local_got_refcounts = elf_local_got_refcounts (abfd);
830 dynobj = elf_hash_table (info)->dynobj;
834 sgot = bfd_get_section_by_name (dynobj, ".got");
835 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
837 relend = relocs + sec->reloc_count;
838 for (rel = relocs; rel < relend; rel++)
840 switch (ELF32_R_TYPE (rel->r_info))
848 r_symndx = ELF32_R_SYM (rel->r_info);
849 if (r_symndx >= symtab_hdr->sh_info)
851 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
852 if (h->got.refcount > 0)
855 if (h->got.refcount == 0)
857 /* We don't need the .got entry any more. */
858 sgot->_raw_size -= 4;
859 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
863 else if (local_got_refcounts != NULL)
865 if (local_got_refcounts[r_symndx] > 0)
867 --local_got_refcounts[r_symndx];
868 if (local_got_refcounts[r_symndx] == 0)
870 /* We don't need the .got entry any more. */
871 sgot->_raw_size -= 4;
873 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
891 r_symndx = ELF32_R_SYM (rel->r_info);
892 if (r_symndx >= symtab_hdr->sh_info)
894 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
895 if (h->plt.refcount > 0)
908 /* Adjust a symbol defined by a dynamic object and referenced by a
909 regular object. The current definition is in some section of the
910 dynamic object, but we're not including those sections. We have to
911 change the definition to something the rest of the link can
915 elf_m68k_adjust_dynamic_symbol (info, h)
916 struct bfd_link_info *info;
917 struct elf_link_hash_entry *h;
921 unsigned int power_of_two;
923 dynobj = elf_hash_table (info)->dynobj;
925 /* Make sure we know what is going on here. */
926 BFD_ASSERT (dynobj != NULL
927 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
928 || h->weakdef != NULL
929 || ((h->elf_link_hash_flags
930 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
931 && (h->elf_link_hash_flags
932 & ELF_LINK_HASH_REF_REGULAR) != 0
933 && (h->elf_link_hash_flags
934 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
936 /* If this is a function, put it in the procedure linkage table. We
937 will fill in the contents of the procedure linkage table later,
938 when we know the address of the .got section. */
939 if (h->type == STT_FUNC
940 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
943 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
944 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
945 /* We must always create the plt entry if it was referenced
946 by a PLTxxO relocation. In this case we already recorded
947 it as a dynamic symbol. */
950 /* This case can occur if we saw a PLTxx reloc in an input
951 file, but the symbol was never referred to by a dynamic
952 object. In such a case, we don't actually need to build
953 a procedure linkage table, and we can just do a PCxx
955 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
956 h->plt.offset = (bfd_vma) -1;
960 /* GC may have rendered this entry unused. */
961 if (h->plt.refcount <= 0)
963 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
964 h->plt.offset = (bfd_vma) -1;
968 /* Make sure this symbol is output as a dynamic symbol. */
970 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
972 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
976 s = bfd_get_section_by_name (dynobj, ".plt");
977 BFD_ASSERT (s != NULL);
979 /* If this is the first .plt entry, make room for the special
981 if (s->_raw_size == 0)
983 if (CPU32_FLAG (dynobj))
984 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
986 s->_raw_size += PLT_ENTRY_SIZE;
989 /* If this symbol is not defined in a regular file, and we are
990 not generating a shared library, then set the symbol to this
991 location in the .plt. This is required to make function
992 pointers compare as equal between the normal executable and
993 the shared library. */
995 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
997 h->root.u.def.section = s;
998 h->root.u.def.value = s->_raw_size;
1001 h->plt.offset = s->_raw_size;
1003 /* Make room for this entry. */
1004 if (CPU32_FLAG (dynobj))
1005 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1007 s->_raw_size += PLT_ENTRY_SIZE;
1009 /* We also need to make an entry in the .got.plt section, which
1010 will be placed in the .got section by the linker script. */
1012 s = bfd_get_section_by_name (dynobj, ".got.plt");
1013 BFD_ASSERT (s != NULL);
1016 /* We also need to make an entry in the .rela.plt section. */
1018 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1019 BFD_ASSERT (s != NULL);
1020 s->_raw_size += sizeof (Elf32_External_Rela);
1025 /* Reinitialize the plt offset now that it is not used as a reference
1027 h->plt.offset = (bfd_vma) -1;
1029 /* If this is a weak symbol, and there is a real definition, the
1030 processor independent code will have arranged for us to see the
1031 real definition first, and we can just use the same value. */
1032 if (h->weakdef != NULL)
1034 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1035 || h->weakdef->root.type == bfd_link_hash_defweak);
1036 h->root.u.def.section = h->weakdef->root.u.def.section;
1037 h->root.u.def.value = h->weakdef->root.u.def.value;
1041 /* This is a reference to a symbol defined by a dynamic object which
1042 is not a function. */
1044 /* If we are creating a shared library, we must presume that the
1045 only references to the symbol are via the global offset table.
1046 For such cases we need not do anything here; the relocations will
1047 be handled correctly by relocate_section. */
1051 /* We must allocate the symbol in our .dynbss section, which will
1052 become part of the .bss section of the executable. There will be
1053 an entry for this symbol in the .dynsym section. The dynamic
1054 object will contain position independent code, so all references
1055 from the dynamic object to this symbol will go through the global
1056 offset table. The dynamic linker will use the .dynsym entry to
1057 determine the address it must put in the global offset table, so
1058 both the dynamic object and the regular object will refer to the
1059 same memory location for the variable. */
1061 s = bfd_get_section_by_name (dynobj, ".dynbss");
1062 BFD_ASSERT (s != NULL);
1064 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1065 copy the initial value out of the dynamic object and into the
1066 runtime process image. We need to remember the offset into the
1067 .rela.bss section we are going to use. */
1068 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1072 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1073 BFD_ASSERT (srel != NULL);
1074 srel->_raw_size += sizeof (Elf32_External_Rela);
1075 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1078 /* We need to figure out the alignment required for this symbol. I
1079 have no idea how ELF linkers handle this. */
1080 power_of_two = bfd_log2 (h->size);
1081 if (power_of_two > 3)
1084 /* Apply the required alignment. */
1085 s->_raw_size = BFD_ALIGN (s->_raw_size,
1086 (bfd_size_type) (1 << power_of_two));
1087 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1089 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1093 /* Define the symbol as being at this point in the section. */
1094 h->root.u.def.section = s;
1095 h->root.u.def.value = s->_raw_size;
1097 /* Increment the section size to make room for the symbol. */
1098 s->_raw_size += h->size;
1103 /* Set the sizes of the dynamic sections. */
1106 elf_m68k_size_dynamic_sections (output_bfd, info)
1107 bfd *output_bfd ATTRIBUTE_UNUSED;
1108 struct bfd_link_info *info;
1115 dynobj = elf_hash_table (info)->dynobj;
1116 BFD_ASSERT (dynobj != NULL);
1118 if (elf_hash_table (info)->dynamic_sections_created)
1120 /* Set the contents of the .interp section to the interpreter. */
1123 s = bfd_get_section_by_name (dynobj, ".interp");
1124 BFD_ASSERT (s != NULL);
1125 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1126 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1131 /* We may have created entries in the .rela.got section.
1132 However, if we are not creating the dynamic sections, we will
1133 not actually use these entries. Reset the size of .rela.got,
1134 which will cause it to get stripped from the output file
1136 s = bfd_get_section_by_name (dynobj, ".rela.got");
1141 /* If this is a -Bsymbolic shared link, then we need to discard all
1142 PC relative relocs against symbols defined in a regular object.
1143 For the normal shared case we discard the PC relative relocs
1144 against symbols that have become local due to visibility changes.
1145 We allocated space for them in the check_relocs routine, but we
1146 will not fill them in in the relocate_section routine. */
1148 elf_link_hash_traverse (elf_hash_table (info),
1149 elf_m68k_discard_copies,
1152 /* The check_relocs and adjust_dynamic_symbol entry points have
1153 determined the sizes of the various dynamic sections. Allocate
1157 for (s = dynobj->sections; s != NULL; s = s->next)
1162 if ((s->flags & SEC_LINKER_CREATED) == 0)
1165 /* It's OK to base decisions on the section name, because none
1166 of the dynobj section names depend upon the input files. */
1167 name = bfd_get_section_name (dynobj, s);
1171 if (strcmp (name, ".plt") == 0)
1173 if (s->_raw_size == 0)
1175 /* Strip this section if we don't need it; see the
1181 /* Remember whether there is a PLT. */
1185 else if (strncmp (name, ".rela", 5) == 0)
1187 if (s->_raw_size == 0)
1189 /* If we don't need this section, strip it from the
1190 output file. This is mostly to handle .rela.bss and
1191 .rela.plt. We must create both sections in
1192 create_dynamic_sections, because they must be created
1193 before the linker maps input sections to output
1194 sections. The linker does that before
1195 adjust_dynamic_symbol is called, and it is that
1196 function which decides whether anything needs to go
1197 into these sections. */
1204 /* We use the reloc_count field as a counter if we need
1205 to copy relocs into the output file. */
1209 else if (strncmp (name, ".got", 4) != 0)
1211 /* It's not one of our sections, so don't allocate space. */
1217 _bfd_strip_section_from_output (info, s);
1221 /* Allocate memory for the section contents. */
1222 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1223 Unused entries should be reclaimed before the section's contents
1224 are written out, but at the moment this does not happen. Thus in
1225 order to prevent writing out garbage, we initialise the section's
1226 contents to zero. */
1227 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1228 if (s->contents == NULL && s->_raw_size != 0)
1232 if (elf_hash_table (info)->dynamic_sections_created)
1234 /* Add some entries to the .dynamic section. We fill in the
1235 values later, in elf_m68k_finish_dynamic_sections, but we
1236 must add the entries now so that we get the correct size for
1237 the .dynamic section. The DT_DEBUG entry is filled in by the
1238 dynamic linker and used by the debugger. */
1239 #define add_dynamic_entry(TAG, VAL) \
1240 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1244 if (!add_dynamic_entry (DT_DEBUG, 0))
1250 if (!add_dynamic_entry (DT_PLTGOT, 0)
1251 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1252 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1253 || !add_dynamic_entry (DT_JMPREL, 0))
1259 if (!add_dynamic_entry (DT_RELA, 0)
1260 || !add_dynamic_entry (DT_RELASZ, 0)
1261 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1265 if ((info->flags & DF_TEXTREL) != 0)
1267 if (!add_dynamic_entry (DT_TEXTREL, 0))
1271 #undef add_dynamic_entry
1276 /* This function is called via elf_link_hash_traverse if we are
1277 creating a shared object. In the -Bsymbolic case it discards the
1278 space allocated to copy PC relative relocs against symbols which
1279 are defined in regular objects. For the normal shared case, it
1280 discards space for pc-relative relocs that have become local due to
1281 symbol visibility changes. We allocated space for them in the
1282 check_relocs routine, but we won't fill them in in the
1283 relocate_section routine.
1285 We also check whether any of the remaining relocations apply
1286 against a readonly section, and set the DF_TEXTREL flag in this
1290 elf_m68k_discard_copies (h, inf)
1291 struct elf_link_hash_entry *h;
1294 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1295 struct elf_m68k_pcrel_relocs_copied *s;
1297 if (h->root.type == bfd_link_hash_warning)
1298 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1300 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
1302 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0))
1304 if ((info->flags & DF_TEXTREL) == 0)
1306 /* Look for relocations against read-only sections. */
1307 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1310 if ((s->section->flags & SEC_READONLY) != 0)
1312 info->flags |= DF_TEXTREL;
1320 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1323 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1328 /* Relocate an M68K ELF section. */
1331 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1332 contents, relocs, local_syms, local_sections)
1334 struct bfd_link_info *info;
1336 asection *input_section;
1338 Elf_Internal_Rela *relocs;
1339 Elf_Internal_Sym *local_syms;
1340 asection **local_sections;
1343 Elf_Internal_Shdr *symtab_hdr;
1344 struct elf_link_hash_entry **sym_hashes;
1345 bfd_vma *local_got_offsets;
1349 Elf_Internal_Rela *rel;
1350 Elf_Internal_Rela *relend;
1352 if (info->relocateable)
1355 dynobj = elf_hash_table (info)->dynobj;
1356 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1357 sym_hashes = elf_sym_hashes (input_bfd);
1358 local_got_offsets = elf_local_got_offsets (input_bfd);
1365 relend = relocs + input_section->reloc_count;
1366 for (; rel < relend; rel++)
1369 reloc_howto_type *howto;
1370 unsigned long r_symndx;
1371 struct elf_link_hash_entry *h;
1372 Elf_Internal_Sym *sym;
1375 bfd_reloc_status_type r;
1377 r_type = ELF32_R_TYPE (rel->r_info);
1378 if (r_type < 0 || r_type >= (int) R_68K_max)
1380 bfd_set_error (bfd_error_bad_value);
1383 howto = howto_table + r_type;
1385 r_symndx = ELF32_R_SYM (rel->r_info);
1390 if (r_symndx < symtab_hdr->sh_info)
1392 sym = local_syms + r_symndx;
1393 sec = local_sections[r_symndx];
1394 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
1398 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1399 while (h->root.type == bfd_link_hash_indirect
1400 || h->root.type == bfd_link_hash_warning)
1401 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1402 if (h->root.type == bfd_link_hash_defined
1403 || h->root.type == bfd_link_hash_defweak)
1405 sec = h->root.u.def.section;
1406 if (((r_type == R_68K_PLT8
1407 || r_type == R_68K_PLT16
1408 || r_type == R_68K_PLT32
1409 || r_type == R_68K_PLT8O
1410 || r_type == R_68K_PLT16O
1411 || r_type == R_68K_PLT32O)
1412 && h->plt.offset != (bfd_vma) -1
1413 && elf_hash_table (info)->dynamic_sections_created)
1414 || ((r_type == R_68K_GOT8O
1415 || r_type == R_68K_GOT16O
1416 || r_type == R_68K_GOT32O
1417 || ((r_type == R_68K_GOT8
1418 || r_type == R_68K_GOT16
1419 || r_type == R_68K_GOT32)
1420 && strcmp (h->root.root.string,
1421 "_GLOBAL_OFFSET_TABLE_") != 0))
1422 && elf_hash_table (info)->dynamic_sections_created
1424 || (! info->symbolic && h->dynindx != -1)
1425 || (h->elf_link_hash_flags
1426 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1428 && ((! info->symbolic && h->dynindx != -1)
1429 || (h->elf_link_hash_flags
1430 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1431 && ((input_section->flags & SEC_ALLOC) != 0
1432 /* DWARF will emit R_68K_32 relocations in its
1433 sections against symbols defined externally
1434 in shared libraries. We can't do anything
1436 || ((input_section->flags & SEC_DEBUGGING) != 0
1437 && (h->elf_link_hash_flags
1438 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1439 && (r_type == R_68K_8
1440 || r_type == R_68K_16
1441 || r_type == R_68K_32
1442 || r_type == R_68K_PC8
1443 || r_type == R_68K_PC16
1444 || r_type == R_68K_PC32)))
1446 /* In these cases, we don't need the relocation
1447 value. We check specially because in some
1448 obscure cases sec->output_section will be NULL. */
1452 relocation = (h->root.u.def.value
1453 + sec->output_section->vma
1454 + sec->output_offset);
1456 else if (h->root.type == bfd_link_hash_undefweak)
1458 else if (info->shared
1459 && (!info->symbolic || info->allow_shlib_undefined)
1460 && !info->no_undefined
1461 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1465 if (!(info->callbacks->undefined_symbol
1466 (info, h->root.root.string, input_bfd,
1467 input_section, rel->r_offset,
1468 (!info->shared || info->no_undefined
1469 || ELF_ST_VISIBILITY (h->other)))))
1480 /* Relocation is to the address of the entry for this symbol
1481 in the global offset table. */
1483 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1489 /* Relocation is the offset of the entry for this symbol in
1490 the global offset table. */
1497 sgot = bfd_get_section_by_name (dynobj, ".got");
1498 BFD_ASSERT (sgot != NULL);
1503 off = h->got.offset;
1504 BFD_ASSERT (off != (bfd_vma) -1);
1506 if (!elf_hash_table (info)->dynamic_sections_created
1508 && (info->symbolic || h->dynindx == -1)
1509 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1511 /* This is actually a static link, or it is a
1512 -Bsymbolic link and the symbol is defined
1513 locally, or the symbol was forced to be local
1514 because of a version file.. We must initialize
1515 this entry in the global offset table. Since
1516 the offset must always be a multiple of 4, we
1517 use the least significant bit to record whether
1518 we have initialized it already.
1520 When doing a dynamic link, we create a .rela.got
1521 relocation entry to initialize the value. This
1522 is done in the finish_dynamic_symbol routine. */
1527 bfd_put_32 (output_bfd, relocation,
1528 sgot->contents + off);
1535 BFD_ASSERT (local_got_offsets != NULL
1536 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1538 off = local_got_offsets[r_symndx];
1540 /* The offset must always be a multiple of 4. We use
1541 the least significant bit to record whether we have
1542 already generated the necessary reloc. */
1547 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1552 Elf_Internal_Rela outrel;
1555 s = bfd_get_section_by_name (dynobj, ".rela.got");
1556 BFD_ASSERT (s != NULL);
1558 outrel.r_offset = (sgot->output_section->vma
1559 + sgot->output_offset
1561 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1562 outrel.r_addend = relocation;
1564 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1565 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1568 local_got_offsets[r_symndx] |= 1;
1572 relocation = sgot->output_offset + off;
1573 if (r_type == R_68K_GOT8O
1574 || r_type == R_68K_GOT16O
1575 || r_type == R_68K_GOT32O)
1577 /* This relocation does not use the addend. */
1581 relocation += sgot->output_section->vma;
1588 /* Relocation is to the entry for this symbol in the
1589 procedure linkage table. */
1591 /* Resolve a PLTxx reloc against a local symbol directly,
1592 without using the procedure linkage table. */
1596 if (h->plt.offset == (bfd_vma) -1
1597 || !elf_hash_table (info)->dynamic_sections_created)
1599 /* We didn't make a PLT entry for this symbol. This
1600 happens when statically linking PIC code, or when
1601 using -Bsymbolic. */
1607 splt = bfd_get_section_by_name (dynobj, ".plt");
1608 BFD_ASSERT (splt != NULL);
1611 relocation = (splt->output_section->vma
1612 + splt->output_offset
1619 /* Relocation is the offset of the entry for this symbol in
1620 the procedure linkage table. */
1621 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1625 splt = bfd_get_section_by_name (dynobj, ".plt");
1626 BFD_ASSERT (splt != NULL);
1629 relocation = h->plt.offset;
1631 /* This relocation does not use the addend. */
1641 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1649 && (input_section->flags & SEC_ALLOC) != 0
1650 && ((r_type != R_68K_PC8
1651 && r_type != R_68K_PC16
1652 && r_type != R_68K_PC32)
1654 || (h->elf_link_hash_flags
1655 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1657 Elf_Internal_Rela outrel;
1659 bfd_boolean skip, relocate;
1661 /* When generating a shared object, these relocations
1662 are copied into the output file to be resolved at run
1669 name = (bfd_elf_string_from_elf_section
1671 elf_elfheader (input_bfd)->e_shstrndx,
1672 elf_section_data (input_section)->rel_hdr.sh_name));
1676 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1677 && strcmp (bfd_get_section_name (input_bfd,
1681 sreloc = bfd_get_section_by_name (dynobj, name);
1682 BFD_ASSERT (sreloc != NULL);
1689 _bfd_elf_section_offset (output_bfd, info, input_section,
1691 if (outrel.r_offset == (bfd_vma) -1)
1693 else if (outrel.r_offset == (bfd_vma) -2)
1694 skip = TRUE, relocate = TRUE;
1695 outrel.r_offset += (input_section->output_section->vma
1696 + input_section->output_offset);
1699 memset (&outrel, 0, sizeof outrel);
1700 /* h->dynindx may be -1 if the symbol was marked to
1703 && ((! info->symbolic && h->dynindx != -1)
1704 || (h->elf_link_hash_flags
1705 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1707 BFD_ASSERT (h->dynindx != -1);
1708 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1709 outrel.r_addend = relocation + rel->r_addend;
1713 if (r_type == R_68K_32)
1716 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1717 outrel.r_addend = relocation + rel->r_addend;
1724 sec = local_sections[r_symndx];
1727 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1729 == bfd_link_hash_defweak));
1730 sec = h->root.u.def.section;
1732 if (sec != NULL && bfd_is_abs_section (sec))
1734 else if (sec == NULL || sec->owner == NULL)
1736 bfd_set_error (bfd_error_bad_value);
1743 osec = sec->output_section;
1744 indx = elf_section_data (osec)->dynindx;
1745 BFD_ASSERT (indx > 0);
1748 outrel.r_info = ELF32_R_INFO (indx, r_type);
1749 outrel.r_addend = relocation + rel->r_addend;
1753 loc = sreloc->contents;
1754 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1755 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1757 /* This reloc will be computed at runtime, so there's no
1758 need to do anything now, except for R_68K_32
1759 relocations that have been turned into
1767 case R_68K_GNU_VTINHERIT:
1768 case R_68K_GNU_VTENTRY:
1769 /* These are no-ops in the end. */
1776 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1777 contents, rel->r_offset,
1778 relocation, rel->r_addend);
1780 if (r != bfd_reloc_ok)
1785 case bfd_reloc_outofrange:
1787 case bfd_reloc_overflow:
1792 name = h->root.root.string;
1795 name = bfd_elf_string_from_elf_section (input_bfd,
1796 symtab_hdr->sh_link,
1801 name = bfd_section_name (input_bfd, sec);
1803 if (!(info->callbacks->reloc_overflow
1804 (info, name, howto->name, (bfd_vma) 0,
1805 input_bfd, input_section, rel->r_offset)))
1816 /* Finish up dynamic symbol handling. We set the contents of various
1817 dynamic sections here. */
1820 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1822 struct bfd_link_info *info;
1823 struct elf_link_hash_entry *h;
1824 Elf_Internal_Sym *sym;
1827 int plt_off1, plt_off2, plt_off3;
1829 dynobj = elf_hash_table (info)->dynobj;
1831 if (h->plt.offset != (bfd_vma) -1)
1838 Elf_Internal_Rela rela;
1841 /* This symbol has an entry in the procedure linkage table. Set
1844 BFD_ASSERT (h->dynindx != -1);
1846 splt = bfd_get_section_by_name (dynobj, ".plt");
1847 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1848 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1849 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1851 /* Get the index in the procedure linkage table which
1852 corresponds to this symbol. This is the index of this symbol
1853 in all the symbols for which we are making plt entries. The
1854 first entry in the procedure linkage table is reserved. */
1855 if ( CPU32_FLAG (output_bfd))
1856 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1858 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1860 /* Get the offset into the .got table of the entry that
1861 corresponds to this function. Each .got entry is 4 bytes.
1862 The first three are reserved. */
1863 got_offset = (plt_index + 3) * 4;
1865 if ( CPU32_FLAG (output_bfd))
1867 /* Fill in the entry in the procedure linkage table. */
1868 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1869 PLT_CPU32_ENTRY_SIZE);
1876 /* Fill in the entry in the procedure linkage table. */
1877 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1884 /* The offset is relative to the first extension word. */
1885 bfd_put_32 (output_bfd,
1886 (sgot->output_section->vma
1887 + sgot->output_offset
1889 - (splt->output_section->vma
1890 + h->plt.offset + 2)),
1891 splt->contents + h->plt.offset + plt_off1);
1893 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1894 splt->contents + h->plt.offset + plt_off2);
1895 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1896 splt->contents + h->plt.offset + plt_off3);
1898 /* Fill in the entry in the global offset table. */
1899 bfd_put_32 (output_bfd,
1900 (splt->output_section->vma
1901 + splt->output_offset
1904 sgot->contents + got_offset);
1906 /* Fill in the entry in the .rela.plt section. */
1907 rela.r_offset = (sgot->output_section->vma
1908 + sgot->output_offset
1910 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1912 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1913 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1915 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1917 /* Mark the symbol as undefined, rather than as defined in
1918 the .plt section. Leave the value alone. */
1919 sym->st_shndx = SHN_UNDEF;
1923 if (h->got.offset != (bfd_vma) -1)
1927 Elf_Internal_Rela rela;
1930 /* This symbol has an entry in the global offset table. Set it
1933 sgot = bfd_get_section_by_name (dynobj, ".got");
1934 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1935 BFD_ASSERT (sgot != NULL && srela != NULL);
1937 rela.r_offset = (sgot->output_section->vma
1938 + sgot->output_offset
1939 + (h->got.offset &~ (bfd_vma) 1));
1941 /* If this is a -Bsymbolic link, and the symbol is defined
1942 locally, we just want to emit a RELATIVE reloc. Likewise if
1943 the symbol was forced to be local because of a version file.
1944 The entry in the global offset table will already have been
1945 initialized in the relocate_section function. */
1947 && (info->symbolic || h->dynindx == -1)
1948 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1950 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1951 rela.r_addend = bfd_get_signed_32 (output_bfd,
1953 + (h->got.offset &~ (bfd_vma) 1)));
1957 bfd_put_32 (output_bfd, (bfd_vma) 0,
1958 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1959 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1963 loc = srela->contents;
1964 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1965 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1968 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1971 Elf_Internal_Rela rela;
1974 /* This symbol needs a copy reloc. Set it up. */
1976 BFD_ASSERT (h->dynindx != -1
1977 && (h->root.type == bfd_link_hash_defined
1978 || h->root.type == bfd_link_hash_defweak));
1980 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1982 BFD_ASSERT (s != NULL);
1984 rela.r_offset = (h->root.u.def.value
1985 + h->root.u.def.section->output_section->vma
1986 + h->root.u.def.section->output_offset);
1987 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1989 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1990 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1993 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1994 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1995 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1996 sym->st_shndx = SHN_ABS;
2001 /* Finish up the dynamic sections. */
2004 elf_m68k_finish_dynamic_sections (output_bfd, info)
2006 struct bfd_link_info *info;
2012 dynobj = elf_hash_table (info)->dynobj;
2014 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2015 BFD_ASSERT (sgot != NULL);
2016 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2018 if (elf_hash_table (info)->dynamic_sections_created)
2021 Elf32_External_Dyn *dyncon, *dynconend;
2023 splt = bfd_get_section_by_name (dynobj, ".plt");
2024 BFD_ASSERT (splt != NULL && sdyn != NULL);
2026 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2027 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2028 for (; dyncon < dynconend; dyncon++)
2030 Elf_Internal_Dyn dyn;
2034 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2047 s = bfd_get_section_by_name (output_bfd, name);
2048 BFD_ASSERT (s != NULL);
2049 dyn.d_un.d_ptr = s->vma;
2050 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2054 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2055 BFD_ASSERT (s != NULL);
2056 if (s->_cooked_size != 0)
2057 dyn.d_un.d_val = s->_cooked_size;
2059 dyn.d_un.d_val = s->_raw_size;
2060 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2064 /* The procedure linkage table relocs (DT_JMPREL) should
2065 not be included in the overall relocs (DT_RELA).
2066 Therefore, we override the DT_RELASZ entry here to
2067 make it not include the JMPREL relocs. Since the
2068 linker script arranges for .rela.plt to follow all
2069 other relocation sections, we don't have to worry
2070 about changing the DT_RELA entry. */
2071 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2074 if (s->_cooked_size != 0)
2075 dyn.d_un.d_val -= s->_cooked_size;
2077 dyn.d_un.d_val -= s->_raw_size;
2079 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2084 /* Fill in the first entry in the procedure linkage table. */
2085 if (splt->_raw_size > 0)
2087 if (!CPU32_FLAG (output_bfd))
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
2105 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2106 bfd_put_32 (output_bfd,
2107 (sgot->output_section->vma
2108 + sgot->output_offset + 4
2109 - (splt->output_section->vma + 2)),
2110 splt->contents + 4);
2111 bfd_put_32 (output_bfd,
2112 (sgot->output_section->vma
2113 + sgot->output_offset + 8
2114 - (splt->output_section->vma + 10)),
2115 splt->contents + 12);
2116 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2117 = PLT_CPU32_ENTRY_SIZE;
2122 /* Fill in the first three entries in the global offset table. */
2123 if (sgot->_raw_size > 0)
2126 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2128 bfd_put_32 (output_bfd,
2129 sdyn->output_section->vma + sdyn->output_offset,
2131 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2132 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2135 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2140 /* Given a .data section and a .emreloc in-memory section, store
2141 relocation information into the .emreloc section which can be
2142 used at runtime to relocate the section. This is called by the
2143 linker when the --embedded-relocs switch is used. This is called
2144 after the add_symbols entry point has been called for all the
2145 objects, and before the final_link entry point is called. */
2148 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2150 struct bfd_link_info *info;
2155 Elf_Internal_Shdr *symtab_hdr;
2156 Elf_Internal_Sym *isymbuf = NULL;
2157 Elf_Internal_Rela *internal_relocs = NULL;
2158 Elf_Internal_Rela *irel, *irelend;
2162 BFD_ASSERT (! info->relocateable);
2166 if (datasec->reloc_count == 0)
2169 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2171 /* Get a copy of the native relocations. */
2172 internal_relocs = (_bfd_elf32_link_read_relocs
2173 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2174 info->keep_memory));
2175 if (internal_relocs == NULL)
2178 amt = (bfd_size_type) datasec->reloc_count * 12;
2179 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2180 if (relsec->contents == NULL)
2183 p = relsec->contents;
2185 irelend = internal_relocs + datasec->reloc_count;
2186 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2188 asection *targetsec;
2190 /* We are going to write a four byte longword into the runtime
2191 reloc section. The longword will be the address in the data
2192 section which must be relocated. It is followed by the name
2193 of the target section NUL-padded or truncated to 8
2196 /* We can only relocate absolute longword relocs at run time. */
2197 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2199 *errmsg = _("unsupported reloc type");
2200 bfd_set_error (bfd_error_bad_value);
2204 /* Get the target section referred to by the reloc. */
2205 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2207 /* A local symbol. */
2208 Elf_Internal_Sym *isym;
2210 /* Read this BFD's local symbols if we haven't done so already. */
2211 if (isymbuf == NULL)
2213 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2214 if (isymbuf == NULL)
2215 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2216 symtab_hdr->sh_info, 0,
2218 if (isymbuf == NULL)
2222 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2223 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2228 struct elf_link_hash_entry *h;
2230 /* An external symbol. */
2231 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2232 h = elf_sym_hashes (abfd)[indx];
2233 BFD_ASSERT (h != NULL);
2234 if (h->root.type == bfd_link_hash_defined
2235 || h->root.type == bfd_link_hash_defweak)
2236 targetsec = h->root.u.def.section;
2241 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2242 memset (p + 4, 0, 8);
2243 if (targetsec != NULL)
2244 strncpy (p + 4, targetsec->output_section->name, 8);
2247 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2249 if (internal_relocs != NULL
2250 && elf_section_data (datasec)->relocs != internal_relocs)
2251 free (internal_relocs);
2255 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2257 if (internal_relocs != NULL
2258 && elf_section_data (datasec)->relocs != internal_relocs)
2259 free (internal_relocs);
2263 static enum elf_reloc_type_class
2264 elf32_m68k_reloc_type_class (rela)
2265 const Elf_Internal_Rela *rela;
2267 switch ((int) ELF32_R_TYPE (rela->r_info))
2269 case R_68K_RELATIVE:
2270 return reloc_class_relative;
2271 case R_68K_JMP_SLOT:
2272 return reloc_class_plt;
2274 return reloc_class_copy;
2276 return reloc_class_normal;
2280 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2281 #define TARGET_BIG_NAME "elf32-m68k"
2282 #define ELF_MACHINE_CODE EM_68K
2283 #define ELF_MAXPAGESIZE 0x2000
2284 #define elf_backend_create_dynamic_sections \
2285 _bfd_elf_create_dynamic_sections
2286 #define bfd_elf32_bfd_link_hash_table_create \
2287 elf_m68k_link_hash_table_create
2288 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2290 #define elf_backend_check_relocs elf_m68k_check_relocs
2291 #define elf_backend_adjust_dynamic_symbol \
2292 elf_m68k_adjust_dynamic_symbol
2293 #define elf_backend_size_dynamic_sections \
2294 elf_m68k_size_dynamic_sections
2295 #define elf_backend_relocate_section elf_m68k_relocate_section
2296 #define elf_backend_finish_dynamic_symbol \
2297 elf_m68k_finish_dynamic_symbol
2298 #define elf_backend_finish_dynamic_sections \
2299 elf_m68k_finish_dynamic_sections
2300 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2301 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2302 #define bfd_elf32_bfd_merge_private_bfd_data \
2303 elf32_m68k_merge_private_bfd_data
2304 #define bfd_elf32_bfd_set_private_flags \
2305 elf32_m68k_set_private_flags
2306 #define bfd_elf32_bfd_print_private_bfd_data \
2307 elf32_m68k_print_private_bfd_data
2308 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2310 #define elf_backend_can_gc_sections 1
2311 #define elf_backend_can_refcount 1
2312 #define elf_backend_want_got_plt 1
2313 #define elf_backend_plt_readonly 1
2314 #define elf_backend_want_plt_sym 0
2315 #define elf_backend_got_header_size 12
2316 #define elf_backend_rela_normal 1
2318 #include "elf32-target.h"