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
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. */
220 #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32)
222 #define PLT_CPU32_ENTRY_SIZE 24
223 /* Procedure linkage table entries for the cpu32 */
224 static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] =
226 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
227 0, 0, 0, 0, /* replaced with offset to .got + 4. */
228 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
229 0, 0, 0, 0, /* replace with offset to .got +8. */
230 0x4e, 0xd1, /* jmp %a1@ */
231 0, 0, 0, 0, /* pad out to 24 bytes. */
235 static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] =
237 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
238 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */
239 0x4e, 0xd1, /* jmp %a1@ */
240 0x2f, 0x3c, /* move.l #offset,-(%sp) */
241 0, 0, 0, 0, /* replaced with offset into relocation table. */
242 0x60, 0xff, /* bra.l .plt */
243 0, 0, 0, 0, /* replaced with offset to start of .plt. */
247 /* The m68k linker needs to keep track of the number of relocs that it
248 decides to copy in check_relocs for each symbol. This is so that it
249 can discard PC relative relocs if it doesn't need them when linking
250 with -Bsymbolic. We store the information in a field extending the
251 regular ELF linker hash table. */
253 /* This structure keeps track of the number of PC relative relocs we have
254 copied for a given symbol. */
256 struct elf_m68k_pcrel_relocs_copied
259 struct elf_m68k_pcrel_relocs_copied *next;
260 /* A section in dynobj. */
262 /* Number of relocs copied in this section. */
266 /* m68k ELF linker hash entry. */
268 struct elf_m68k_link_hash_entry
270 struct elf_link_hash_entry root;
272 /* Number of PC relative relocs copied for this symbol. */
273 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
276 #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent))
278 /* m68k ELF linker hash table. */
280 struct elf_m68k_link_hash_table
282 struct elf_link_hash_table root;
284 /* Small local sym to section mapping cache. */
285 struct sym_sec_cache sym_sec;
288 /* Get the m68k ELF linker hash table from a link_info structure. */
290 #define elf_m68k_hash_table(p) \
291 ((struct elf_m68k_link_hash_table *) (p)->hash)
293 /* Create an entry in an m68k ELF linker hash table. */
295 static struct bfd_hash_entry *
296 elf_m68k_link_hash_newfunc (entry, table, string)
297 struct bfd_hash_entry *entry;
298 struct bfd_hash_table *table;
301 struct bfd_hash_entry *ret = entry;
303 /* Allocate the structure if it has not already been allocated by a
306 ret = bfd_hash_allocate (table,
307 sizeof (struct elf_m68k_link_hash_entry));
311 /* Call the allocation method of the superclass. */
312 ret = _bfd_elf_link_hash_newfunc (ret, table, string);
314 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL;
319 /* Create an m68k ELF linker hash table. */
321 static struct bfd_link_hash_table *
322 elf_m68k_link_hash_table_create (abfd)
325 struct elf_m68k_link_hash_table *ret;
326 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table);
328 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt);
329 if (ret == (struct elf_m68k_link_hash_table *) NULL)
332 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
333 elf_m68k_link_hash_newfunc))
339 ret->sym_sec.abfd = NULL;
341 return &ret->root.root;
344 /* Keep m68k-specific flags in the ELF header. */
346 elf32_m68k_set_private_flags (abfd, flags)
350 elf_elfheader (abfd)->e_flags = flags;
351 elf_flags_init (abfd) = TRUE;
355 /* Merge backend specific data from an object file to the output
356 object file when linking. */
358 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
365 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
366 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
369 in_flags = elf_elfheader (ibfd)->e_flags;
370 out_flags = elf_elfheader (obfd)->e_flags;
372 if (!elf_flags_init (obfd))
374 elf_flags_init (obfd) = TRUE;
375 elf_elfheader (obfd)->e_flags = in_flags;
381 /* Display the flags field. */
383 elf32_m68k_print_private_bfd_data (abfd, ptr)
387 FILE *file = (FILE *) ptr;
389 BFD_ASSERT (abfd != NULL && ptr != NULL);
391 /* Print normal ELF private data. */
392 _bfd_elf_print_private_bfd_data (abfd, ptr);
394 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
396 /* xgettext:c-format */
397 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
399 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
400 fprintf (file, _(" [cpu32]"));
402 if (elf_elfheader (abfd)->e_flags & EF_M68000)
403 fprintf (file, _(" [m68000]"));
409 /* Look through the relocs for a section during the first phase, and
410 allocate space in the global offset table or procedure linkage
414 elf_m68k_check_relocs (abfd, info, sec, relocs)
416 struct bfd_link_info *info;
418 const Elf_Internal_Rela *relocs;
421 Elf_Internal_Shdr *symtab_hdr;
422 struct elf_link_hash_entry **sym_hashes;
423 bfd_signed_vma *local_got_refcounts;
424 const Elf_Internal_Rela *rel;
425 const Elf_Internal_Rela *rel_end;
430 if (info->relocateable)
433 dynobj = elf_hash_table (info)->dynobj;
434 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
435 sym_hashes = elf_sym_hashes (abfd);
436 local_got_refcounts = elf_local_got_refcounts (abfd);
442 rel_end = relocs + sec->reloc_count;
443 for (rel = relocs; rel < rel_end; rel++)
445 unsigned long r_symndx;
446 struct elf_link_hash_entry *h;
448 r_symndx = ELF32_R_SYM (rel->r_info);
450 if (r_symndx < symtab_hdr->sh_info)
453 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
455 switch (ELF32_R_TYPE (rel->r_info))
461 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
467 /* This symbol requires a global offset table entry. */
471 /* Create the .got section. */
472 elf_hash_table (info)->dynobj = dynobj = abfd;
473 if (!_bfd_elf_create_got_section (dynobj, info))
479 sgot = bfd_get_section_by_name (dynobj, ".got");
480 BFD_ASSERT (sgot != NULL);
484 && (h != NULL || info->shared))
486 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
489 srelgot = bfd_make_section (dynobj, ".rela.got");
491 || !bfd_set_section_flags (dynobj, srelgot,
498 || !bfd_set_section_alignment (dynobj, srelgot, 2))
505 if (h->got.refcount == 0)
507 /* Make sure this symbol is output as a dynamic symbol. */
509 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
511 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
515 /* Allocate space in the .got section. */
516 sgot->_raw_size += 4;
517 /* Allocate relocation space. */
518 srelgot->_raw_size += sizeof (Elf32_External_Rela);
524 /* This is a global offset table entry for a local symbol. */
525 if (local_got_refcounts == NULL)
529 size = symtab_hdr->sh_info;
530 size *= sizeof (bfd_signed_vma);
531 local_got_refcounts = ((bfd_signed_vma *)
532 bfd_zalloc (abfd, size));
533 if (local_got_refcounts == NULL)
535 elf_local_got_refcounts (abfd) = local_got_refcounts;
537 if (local_got_refcounts[r_symndx] == 0)
539 sgot->_raw_size += 4;
542 /* If we are generating a shared object, we need to
543 output a R_68K_RELATIVE reloc so that the dynamic
544 linker can adjust this GOT entry. */
545 srelgot->_raw_size += sizeof (Elf32_External_Rela);
548 local_got_refcounts[r_symndx]++;
555 /* This symbol requires a procedure linkage table entry. We
556 actually build the entry in adjust_dynamic_symbol,
557 because this might be a case of linking PIC code which is
558 never referenced by a dynamic object, in which case we
559 don't need to generate a procedure linkage table entry
562 /* If this is a local symbol, we resolve it directly without
563 creating a procedure linkage table entry. */
567 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
574 /* This symbol requires a procedure linkage table entry. */
578 /* It does not make sense to have this relocation for a
579 local symbol. FIXME: does it? How to handle it if
580 it does make sense? */
581 bfd_set_error (bfd_error_bad_value);
585 /* Make sure this symbol is output as a dynamic symbol. */
587 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
589 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
593 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
600 /* If we are creating a shared library and this is not a local
601 symbol, we need to copy the reloc into the shared library.
602 However when linking with -Bsymbolic and this is a global
603 symbol which is defined in an object we are including in the
604 link (i.e., DEF_REGULAR is set), then we can resolve the
605 reloc directly. At this point we have not seen all the input
606 files, so it is possible that DEF_REGULAR is not set now but
607 will be set later (it is never cleared). We account for that
608 possibility below by storing information in the
609 pcrel_relocs_copied field of the hash table entry. */
611 && (sec->flags & SEC_ALLOC) != 0
614 || h->root.type == bfd_link_hash_defweak
615 || (h->elf_link_hash_flags
616 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
620 /* Make sure a plt entry is created for this symbol if
621 it turns out to be a function defined by a dynamic
633 /* Make sure a plt entry is created for this symbol if it
634 turns out to be a function defined by a dynamic object. */
638 /* If we are creating a shared library, we need to copy the
639 reloc into the shared library. */
641 && (sec->flags & SEC_ALLOC) != 0)
643 /* When creating a shared object, we must copy these
644 reloc types into the output file. We create a reloc
645 section in dynobj and make room for this reloc. */
650 name = (bfd_elf_string_from_elf_section
652 elf_elfheader (abfd)->e_shstrndx,
653 elf_section_data (sec)->rel_hdr.sh_name));
657 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
658 && strcmp (bfd_get_section_name (abfd, sec),
661 sreloc = bfd_get_section_by_name (dynobj, name);
664 sreloc = bfd_make_section (dynobj, name);
666 || !bfd_set_section_flags (dynobj, sreloc,
673 || !bfd_set_section_alignment (dynobj, sreloc, 2))
678 if (sec->flags & SEC_READONLY
679 /* Don't set DF_TEXTREL yet for PC relative
680 relocations, they might be discarded later. */
681 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8
682 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
683 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32))
684 info->flags |= DF_TEXTREL;
686 sreloc->_raw_size += sizeof (Elf32_External_Rela);
688 /* We count the number of PC relative relocations we have
689 entered for this symbol, so that we can discard them
690 again if, in the -Bsymbolic case, the symbol is later
691 defined by a regular object, or, in the normal shared
692 case, the symbol is forced to be local. Note that this
693 function is only called if we are using an m68kelf linker
694 hash table, which means that h is really a pointer to an
695 elf_m68k_link_hash_entry. */
696 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8
697 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
698 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
700 struct elf_m68k_pcrel_relocs_copied *p;
701 struct elf_m68k_pcrel_relocs_copied **head;
705 struct elf_m68k_link_hash_entry *eh
706 = elf_m68k_hash_entry (h);
707 head = &eh->pcrel_relocs_copied;
712 s = (bfd_section_from_r_symndx
713 (abfd, &elf_m68k_hash_table (info)->sym_sec,
718 head = ((struct elf_m68k_pcrel_relocs_copied **)
719 &elf_section_data (s)->local_dynrel);
722 for (p = *head; p != NULL; p = p->next)
723 if (p->section == sreloc)
728 p = ((struct elf_m68k_pcrel_relocs_copied *)
729 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
744 /* This relocation describes the C++ object vtable hierarchy.
745 Reconstruct it for later use during GC. */
746 case R_68K_GNU_VTINHERIT:
747 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
751 /* This relocation describes which C++ vtable entries are actually
752 used. Record for later use during GC. */
753 case R_68K_GNU_VTENTRY:
754 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
766 /* Return the section that should be marked against GC for a given
770 elf_m68k_gc_mark_hook (sec, info, rel, h, sym)
772 struct bfd_link_info *info ATTRIBUTE_UNUSED;
773 Elf_Internal_Rela *rel;
774 struct elf_link_hash_entry *h;
775 Elf_Internal_Sym *sym;
779 switch (ELF32_R_TYPE (rel->r_info))
781 case R_68K_GNU_VTINHERIT:
782 case R_68K_GNU_VTENTRY:
786 switch (h->root.type)
791 case bfd_link_hash_defined:
792 case bfd_link_hash_defweak:
793 return h->root.u.def.section;
795 case bfd_link_hash_common:
796 return h->root.u.c.p->section;
801 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
806 /* Update the got entry reference counts for the section being removed. */
809 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
811 struct bfd_link_info *info;
813 const Elf_Internal_Rela *relocs;
815 Elf_Internal_Shdr *symtab_hdr;
816 struct elf_link_hash_entry **sym_hashes;
817 bfd_signed_vma *local_got_refcounts;
818 const Elf_Internal_Rela *rel, *relend;
819 unsigned long r_symndx;
820 struct elf_link_hash_entry *h;
825 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
826 sym_hashes = elf_sym_hashes (abfd);
827 local_got_refcounts = elf_local_got_refcounts (abfd);
829 dynobj = elf_hash_table (info)->dynobj;
833 sgot = bfd_get_section_by_name (dynobj, ".got");
834 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
836 relend = relocs + sec->reloc_count;
837 for (rel = relocs; rel < relend; rel++)
839 switch (ELF32_R_TYPE (rel->r_info))
847 r_symndx = ELF32_R_SYM (rel->r_info);
848 if (r_symndx >= symtab_hdr->sh_info)
850 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
851 if (h->got.refcount > 0)
854 if (h->got.refcount == 0)
856 /* We don't need the .got entry any more. */
857 sgot->_raw_size -= 4;
858 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
862 else if (local_got_refcounts != NULL)
864 if (local_got_refcounts[r_symndx] > 0)
866 --local_got_refcounts[r_symndx];
867 if (local_got_refcounts[r_symndx] == 0)
869 /* We don't need the .got entry any more. */
870 sgot->_raw_size -= 4;
872 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
890 r_symndx = ELF32_R_SYM (rel->r_info);
891 if (r_symndx >= symtab_hdr->sh_info)
893 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
894 if (h->plt.refcount > 0)
907 /* Adjust a symbol defined by a dynamic object and referenced by a
908 regular object. The current definition is in some section of the
909 dynamic object, but we're not including those sections. We have to
910 change the definition to something the rest of the link can
914 elf_m68k_adjust_dynamic_symbol (info, h)
915 struct bfd_link_info *info;
916 struct elf_link_hash_entry *h;
920 unsigned int power_of_two;
922 dynobj = elf_hash_table (info)->dynobj;
924 /* Make sure we know what is going on here. */
925 BFD_ASSERT (dynobj != NULL
926 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
927 || h->weakdef != NULL
928 || ((h->elf_link_hash_flags
929 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
930 && (h->elf_link_hash_flags
931 & ELF_LINK_HASH_REF_REGULAR) != 0
932 && (h->elf_link_hash_flags
933 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
935 /* If this is a function, put it in the procedure linkage table. We
936 will fill in the contents of the procedure linkage table later,
937 when we know the address of the .got section. */
938 if (h->type == STT_FUNC
939 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
942 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
943 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
944 /* We must always create the plt entry if it was referenced
945 by a PLTxxO relocation. In this case we already recorded
946 it as a dynamic symbol. */
949 /* This case can occur if we saw a PLTxx reloc in an input
950 file, but the symbol was never referred to by a dynamic
951 object. In such a case, we don't actually need to build
952 a procedure linkage table, and we can just do a PCxx
954 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
955 h->plt.offset = (bfd_vma) -1;
959 /* GC may have rendered this entry unused. */
960 if (h->plt.refcount <= 0)
962 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
963 h->plt.offset = (bfd_vma) -1;
967 /* Make sure this symbol is output as a dynamic symbol. */
969 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
971 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
975 s = bfd_get_section_by_name (dynobj, ".plt");
976 BFD_ASSERT (s != NULL);
978 /* If this is the first .plt entry, make room for the special
980 if (s->_raw_size == 0)
982 if (CPU32_FLAG (dynobj))
983 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
985 s->_raw_size += PLT_ENTRY_SIZE;
988 /* If this symbol is not defined in a regular file, and we are
989 not generating a shared library, then set the symbol to this
990 location in the .plt. This is required to make function
991 pointers compare as equal between the normal executable and
992 the shared library. */
994 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
996 h->root.u.def.section = s;
997 h->root.u.def.value = s->_raw_size;
1000 h->plt.offset = s->_raw_size;
1002 /* Make room for this entry. */
1003 if (CPU32_FLAG (dynobj))
1004 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1006 s->_raw_size += PLT_ENTRY_SIZE;
1008 /* We also need to make an entry in the .got.plt section, which
1009 will be placed in the .got section by the linker script. */
1010 s = bfd_get_section_by_name (dynobj, ".got.plt");
1011 BFD_ASSERT (s != NULL);
1014 /* We also need to make an entry in the .rela.plt section. */
1015 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1016 BFD_ASSERT (s != NULL);
1017 s->_raw_size += sizeof (Elf32_External_Rela);
1022 /* Reinitialize the plt offset now that it is not used as a reference
1024 h->plt.offset = (bfd_vma) -1;
1026 /* If this is a weak symbol, and there is a real definition, the
1027 processor independent code will have arranged for us to see the
1028 real definition first, and we can just use the same value. */
1029 if (h->weakdef != NULL)
1031 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1032 || h->weakdef->root.type == bfd_link_hash_defweak);
1033 h->root.u.def.section = h->weakdef->root.u.def.section;
1034 h->root.u.def.value = h->weakdef->root.u.def.value;
1038 /* This is a reference to a symbol defined by a dynamic object which
1039 is not a function. */
1041 /* If we are creating a shared library, we must presume that the
1042 only references to the symbol are via the global offset table.
1043 For such cases we need not do anything here; the relocations will
1044 be handled correctly by relocate_section. */
1048 /* We must allocate the symbol in our .dynbss section, which will
1049 become part of the .bss section of the executable. There will be
1050 an entry for this symbol in the .dynsym section. The dynamic
1051 object will contain position independent code, so all references
1052 from the dynamic object to this symbol will go through the global
1053 offset table. The dynamic linker will use the .dynsym entry to
1054 determine the address it must put in the global offset table, so
1055 both the dynamic object and the regular object will refer to the
1056 same memory location for the variable. */
1058 s = bfd_get_section_by_name (dynobj, ".dynbss");
1059 BFD_ASSERT (s != NULL);
1061 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1062 copy the initial value out of the dynamic object and into the
1063 runtime process image. We need to remember the offset into the
1064 .rela.bss section we are going to use. */
1065 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1069 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1070 BFD_ASSERT (srel != NULL);
1071 srel->_raw_size += sizeof (Elf32_External_Rela);
1072 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1075 /* We need to figure out the alignment required for this symbol. I
1076 have no idea how ELF linkers handle this. */
1077 power_of_two = bfd_log2 (h->size);
1078 if (power_of_two > 3)
1081 /* Apply the required alignment. */
1082 s->_raw_size = BFD_ALIGN (s->_raw_size,
1083 (bfd_size_type) (1 << power_of_two));
1084 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1086 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1090 /* Define the symbol as being at this point in the section. */
1091 h->root.u.def.section = s;
1092 h->root.u.def.value = s->_raw_size;
1094 /* Increment the section size to make room for the symbol. */
1095 s->_raw_size += h->size;
1100 /* This is the condition under which elf_m68k_finish_dynamic_symbol
1101 will be called from elflink.h. If elflink.h doesn't call our
1102 finish_dynamic_symbol routine, we'll need to do something about
1103 initializing any .plt and .got entries in elf_m68k_relocate_section. */
1104 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1107 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1108 && ((H)->dynindx != -1 \
1109 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1111 /* Set the sizes of the dynamic sections. */
1114 elf_m68k_size_dynamic_sections (output_bfd, info)
1115 bfd *output_bfd ATTRIBUTE_UNUSED;
1116 struct bfd_link_info *info;
1123 dynobj = elf_hash_table (info)->dynobj;
1124 BFD_ASSERT (dynobj != NULL);
1126 if (elf_hash_table (info)->dynamic_sections_created)
1128 /* Set the contents of the .interp section to the interpreter. */
1131 s = bfd_get_section_by_name (dynobj, ".interp");
1132 BFD_ASSERT (s != NULL);
1133 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1134 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1139 /* We may have created entries in the .rela.got section.
1140 However, if we are not creating the dynamic sections, we will
1141 not actually use these entries. Reset the size of .rela.got,
1142 which will cause it to get stripped from the output file
1144 s = bfd_get_section_by_name (dynobj, ".rela.got");
1149 /* If this is a -Bsymbolic shared link, then we need to discard all
1150 PC relative relocs against symbols defined in a regular object.
1151 For the normal shared case we discard the PC relative relocs
1152 against symbols that have become local due to visibility changes.
1153 We allocated space for them in the check_relocs routine, but we
1154 will not fill them in in the relocate_section routine. */
1156 elf_link_hash_traverse (elf_hash_table (info),
1157 elf_m68k_discard_copies,
1160 /* The check_relocs and adjust_dynamic_symbol entry points have
1161 determined the sizes of the various dynamic sections. Allocate
1165 for (s = dynobj->sections; s != NULL; s = s->next)
1170 if ((s->flags & SEC_LINKER_CREATED) == 0)
1173 /* It's OK to base decisions on the section name, because none
1174 of the dynobj section names depend upon the input files. */
1175 name = bfd_get_section_name (dynobj, s);
1179 if (strcmp (name, ".plt") == 0)
1181 if (s->_raw_size == 0)
1183 /* Strip this section if we don't need it; see the
1189 /* Remember whether there is a PLT. */
1193 else if (strncmp (name, ".rela", 5) == 0)
1195 if (s->_raw_size == 0)
1197 /* If we don't need this section, strip it from the
1198 output file. This is mostly to handle .rela.bss and
1199 .rela.plt. We must create both sections in
1200 create_dynamic_sections, because they must be created
1201 before the linker maps input sections to output
1202 sections. The linker does that before
1203 adjust_dynamic_symbol is called, and it is that
1204 function which decides whether anything needs to go
1205 into these sections. */
1212 /* We use the reloc_count field as a counter if we need
1213 to copy relocs into the output file. */
1217 else if (strncmp (name, ".got", 4) != 0)
1219 /* It's not one of our sections, so don't allocate space. */
1225 _bfd_strip_section_from_output (info, s);
1229 /* Allocate memory for the section contents. */
1230 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1231 Unused entries should be reclaimed before the section's contents
1232 are written out, but at the moment this does not happen. Thus in
1233 order to prevent writing out garbage, we initialise the section's
1234 contents to zero. */
1235 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1236 if (s->contents == NULL && s->_raw_size != 0)
1240 if (elf_hash_table (info)->dynamic_sections_created)
1242 /* Add some entries to the .dynamic section. We fill in the
1243 values later, in elf_m68k_finish_dynamic_sections, but we
1244 must add the entries now so that we get the correct size for
1245 the .dynamic section. The DT_DEBUG entry is filled in by the
1246 dynamic linker and used by the debugger. */
1247 #define add_dynamic_entry(TAG, VAL) \
1248 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1252 if (!add_dynamic_entry (DT_DEBUG, 0))
1258 if (!add_dynamic_entry (DT_PLTGOT, 0)
1259 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1260 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1261 || !add_dynamic_entry (DT_JMPREL, 0))
1267 if (!add_dynamic_entry (DT_RELA, 0)
1268 || !add_dynamic_entry (DT_RELASZ, 0)
1269 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1273 if ((info->flags & DF_TEXTREL) != 0)
1275 if (!add_dynamic_entry (DT_TEXTREL, 0))
1279 #undef add_dynamic_entry
1284 /* This function is called via elf_link_hash_traverse if we are
1285 creating a shared object. In the -Bsymbolic case it discards the
1286 space allocated to copy PC relative relocs against symbols which
1287 are defined in regular objects. For the normal shared case, it
1288 discards space for pc-relative relocs that have become local due to
1289 symbol visibility changes. We allocated space for them in the
1290 check_relocs routine, but we won't fill them in in the
1291 relocate_section routine.
1293 We also check whether any of the remaining relocations apply
1294 against a readonly section, and set the DF_TEXTREL flag in this
1298 elf_m68k_discard_copies (h, inf)
1299 struct elf_link_hash_entry *h;
1302 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1303 struct elf_m68k_pcrel_relocs_copied *s;
1305 if (h->root.type == bfd_link_hash_warning)
1306 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1308 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
1310 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0))
1312 if ((info->flags & DF_TEXTREL) == 0)
1314 /* Look for relocations against read-only sections. */
1315 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1318 if ((s->section->flags & SEC_READONLY) != 0)
1320 info->flags |= DF_TEXTREL;
1328 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
1331 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1336 /* Relocate an M68K ELF section. */
1339 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1340 contents, relocs, local_syms, local_sections)
1342 struct bfd_link_info *info;
1344 asection *input_section;
1346 Elf_Internal_Rela *relocs;
1347 Elf_Internal_Sym *local_syms;
1348 asection **local_sections;
1351 Elf_Internal_Shdr *symtab_hdr;
1352 struct elf_link_hash_entry **sym_hashes;
1353 bfd_vma *local_got_offsets;
1357 Elf_Internal_Rela *rel;
1358 Elf_Internal_Rela *relend;
1360 if (info->relocateable)
1363 dynobj = elf_hash_table (info)->dynobj;
1364 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1365 sym_hashes = elf_sym_hashes (input_bfd);
1366 local_got_offsets = elf_local_got_offsets (input_bfd);
1373 relend = relocs + input_section->reloc_count;
1374 for (; rel < relend; rel++)
1377 reloc_howto_type *howto;
1378 unsigned long r_symndx;
1379 struct elf_link_hash_entry *h;
1380 Elf_Internal_Sym *sym;
1383 bfd_boolean unresolved_reloc;
1384 bfd_reloc_status_type r;
1386 r_type = ELF32_R_TYPE (rel->r_info);
1387 if (r_type < 0 || r_type >= (int) R_68K_max)
1389 bfd_set_error (bfd_error_bad_value);
1392 howto = howto_table + r_type;
1394 r_symndx = ELF32_R_SYM (rel->r_info);
1399 unresolved_reloc = FALSE;
1400 if (r_symndx < symtab_hdr->sh_info)
1402 sym = local_syms + r_symndx;
1403 sec = local_sections[r_symndx];
1404 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
1408 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1409 while (h->root.type == bfd_link_hash_indirect
1410 || h->root.type == bfd_link_hash_warning)
1411 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1414 if (h->root.type == bfd_link_hash_defined
1415 || h->root.type == bfd_link_hash_defweak)
1417 sec = h->root.u.def.section;
1418 if (sec->output_section == NULL)
1419 /* Set a flag that will be cleared later if we find a
1420 relocation value for this symbol. output_section
1421 is typically NULL for symbols satisfied by a shared
1423 unresolved_reloc = TRUE;
1425 relocation = (h->root.u.def.value
1426 + sec->output_section->vma
1427 + sec->output_offset);
1429 else if (h->root.type == bfd_link_hash_undefweak)
1431 else if (info->shared
1432 && !info->no_undefined
1433 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1437 if (!(info->callbacks->undefined_symbol
1438 (info, h->root.root.string, input_bfd,
1439 input_section, rel->r_offset,
1440 (!info->shared || info->no_undefined
1441 || ELF_ST_VISIBILITY (h->other)))))
1451 /* Relocation is to the address of the entry for this symbol
1452 in the global offset table. */
1454 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1460 /* Relocation is the offset of the entry for this symbol in
1461 the global offset table. */
1468 sgot = bfd_get_section_by_name (dynobj, ".got");
1469 BFD_ASSERT (sgot != NULL);
1476 off = h->got.offset;
1477 BFD_ASSERT (off != (bfd_vma) -1);
1479 dyn = elf_hash_table (info)->dynamic_sections_created;
1480 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1484 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
1485 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) != 0)
1487 /* This is actually a static link, or it is a
1488 -Bsymbolic link and the symbol is defined
1489 locally, or the symbol was forced to be local
1490 because of a version file.. We must initialize
1491 this entry in the global offset table. Since
1492 the offset must always be a multiple of 4, we
1493 use the least significant bit to record whether
1494 we have initialized it already.
1496 When doing a dynamic link, we create a .rela.got
1497 relocation entry to initialize the value. This
1498 is done in the finish_dynamic_symbol routine. */
1503 bfd_put_32 (output_bfd, relocation,
1504 sgot->contents + off);
1509 unresolved_reloc = FALSE;
1513 BFD_ASSERT (local_got_offsets != NULL
1514 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1516 off = local_got_offsets[r_symndx];
1518 /* The offset must always be a multiple of 4. We use
1519 the least significant bit to record whether we have
1520 already generated the necessary reloc. */
1525 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1530 Elf_Internal_Rela outrel;
1533 s = bfd_get_section_by_name (dynobj, ".rela.got");
1534 BFD_ASSERT (s != NULL);
1536 outrel.r_offset = (sgot->output_section->vma
1537 + sgot->output_offset
1539 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1540 outrel.r_addend = relocation;
1542 loc += s->reloc_count++ * sizeof (Elf32_External_Rela);
1543 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1546 local_got_offsets[r_symndx] |= 1;
1550 relocation = sgot->output_offset + off;
1551 if (r_type == R_68K_GOT8O
1552 || r_type == R_68K_GOT16O
1553 || r_type == R_68K_GOT32O)
1555 /* This relocation does not use the addend. */
1559 relocation += sgot->output_section->vma;
1566 /* Relocation is to the entry for this symbol in the
1567 procedure linkage table. */
1569 /* Resolve a PLTxx reloc against a local symbol directly,
1570 without using the procedure linkage table. */
1574 if (h->plt.offset == (bfd_vma) -1
1575 || !elf_hash_table (info)->dynamic_sections_created)
1577 /* We didn't make a PLT entry for this symbol. This
1578 happens when statically linking PIC code, or when
1579 using -Bsymbolic. */
1585 splt = bfd_get_section_by_name (dynobj, ".plt");
1586 BFD_ASSERT (splt != NULL);
1589 relocation = (splt->output_section->vma
1590 + splt->output_offset
1592 unresolved_reloc = FALSE;
1598 /* Relocation is the offset of the entry for this symbol in
1599 the procedure linkage table. */
1600 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1604 splt = bfd_get_section_by_name (dynobj, ".plt");
1605 BFD_ASSERT (splt != NULL);
1608 relocation = h->plt.offset;
1609 unresolved_reloc = FALSE;
1611 /* This relocation does not use the addend. */
1621 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1629 && (input_section->flags & SEC_ALLOC) != 0
1630 && ((r_type != R_68K_PC8
1631 && r_type != R_68K_PC16
1632 && r_type != R_68K_PC32)
1634 || (h->elf_link_hash_flags
1635 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1637 Elf_Internal_Rela outrel;
1639 bfd_boolean skip, relocate;
1641 /* When generating a shared object, these relocations
1642 are copied into the output file to be resolved at run
1649 name = (bfd_elf_string_from_elf_section
1651 elf_elfheader (input_bfd)->e_shstrndx,
1652 elf_section_data (input_section)->rel_hdr.sh_name));
1656 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1657 && strcmp (bfd_get_section_name (input_bfd,
1661 sreloc = bfd_get_section_by_name (dynobj, name);
1662 BFD_ASSERT (sreloc != NULL);
1669 _bfd_elf_section_offset (output_bfd, info, input_section,
1671 if (outrel.r_offset == (bfd_vma) -1)
1673 else if (outrel.r_offset == (bfd_vma) -2)
1674 skip = TRUE, relocate = TRUE;
1675 outrel.r_offset += (input_section->output_section->vma
1676 + input_section->output_offset);
1679 memset (&outrel, 0, sizeof outrel);
1680 /* h->dynindx may be -1 if the symbol was marked to
1683 && ((! info->symbolic && h->dynindx != -1)
1684 || (h->elf_link_hash_flags
1685 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1687 BFD_ASSERT (h->dynindx != -1);
1688 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1689 outrel.r_addend = relocation + rel->r_addend;
1693 if (r_type == R_68K_32)
1696 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1697 outrel.r_addend = relocation + rel->r_addend;
1704 sec = local_sections[r_symndx];
1707 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1709 == bfd_link_hash_defweak));
1710 sec = h->root.u.def.section;
1712 if (sec != NULL && bfd_is_abs_section (sec))
1714 else if (sec == NULL || sec->owner == NULL)
1716 bfd_set_error (bfd_error_bad_value);
1723 osec = sec->output_section;
1724 indx = elf_section_data (osec)->dynindx;
1725 BFD_ASSERT (indx > 0);
1728 outrel.r_info = ELF32_R_INFO (indx, r_type);
1729 outrel.r_addend = relocation + rel->r_addend;
1733 loc = sreloc->contents;
1734 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1735 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1737 /* This reloc will be computed at runtime, so there's no
1738 need to do anything now, except for R_68K_32
1739 relocations that have been turned into
1747 case R_68K_GNU_VTINHERIT:
1748 case R_68K_GNU_VTENTRY:
1749 /* These are no-ops in the end. */
1756 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1757 because such sections are not SEC_ALLOC and thus ld.so will
1758 not process them. */
1759 if (unresolved_reloc
1760 && !((input_section->flags & SEC_DEBUGGING) != 0
1761 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1763 (*_bfd_error_handler)
1764 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
1765 bfd_archive_filename (input_bfd),
1766 bfd_get_section_name (input_bfd, input_section),
1767 (long) rel->r_offset,
1768 h->root.root.string);
1772 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1773 contents, rel->r_offset,
1774 relocation, rel->r_addend);
1776 if (r != bfd_reloc_ok)
1781 name = h->root.root.string;
1784 name = bfd_elf_string_from_elf_section (input_bfd,
1785 symtab_hdr->sh_link,
1790 name = bfd_section_name (input_bfd, sec);
1793 if (r == bfd_reloc_overflow)
1795 if (!(info->callbacks->reloc_overflow
1796 (info, name, howto->name, (bfd_vma) 0,
1797 input_bfd, input_section, rel->r_offset)))
1802 (*_bfd_error_handler)
1803 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
1804 bfd_archive_filename (input_bfd),
1805 bfd_get_section_name (input_bfd, input_section),
1806 (long) rel->r_offset, name, (int) r);
1815 /* Finish up dynamic symbol handling. We set the contents of various
1816 dynamic sections here. */
1819 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1821 struct bfd_link_info *info;
1822 struct elf_link_hash_entry *h;
1823 Elf_Internal_Sym *sym;
1826 int plt_off1, plt_off2, plt_off3;
1828 dynobj = elf_hash_table (info)->dynobj;
1830 if (h->plt.offset != (bfd_vma) -1)
1837 Elf_Internal_Rela rela;
1840 /* This symbol has an entry in the procedure linkage table. Set
1843 BFD_ASSERT (h->dynindx != -1);
1845 splt = bfd_get_section_by_name (dynobj, ".plt");
1846 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1847 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1848 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1850 /* Get the index in the procedure linkage table which
1851 corresponds to this symbol. This is the index of this symbol
1852 in all the symbols for which we are making plt entries. The
1853 first entry in the procedure linkage table is reserved. */
1854 if ( CPU32_FLAG (output_bfd))
1855 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1857 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1859 /* Get the offset into the .got table of the entry that
1860 corresponds to this function. Each .got entry is 4 bytes.
1861 The first three are reserved. */
1862 got_offset = (plt_index + 3) * 4;
1864 if ( CPU32_FLAG (output_bfd))
1866 /* Fill in the entry in the procedure linkage table. */
1867 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1868 PLT_CPU32_ENTRY_SIZE);
1875 /* Fill in the entry in the procedure linkage table. */
1876 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1883 /* The offset is relative to the first extension word. */
1884 bfd_put_32 (output_bfd,
1885 (sgot->output_section->vma
1886 + sgot->output_offset
1888 - (splt->output_section->vma
1889 + h->plt.offset + 2)),
1890 splt->contents + h->plt.offset + plt_off1);
1892 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1893 splt->contents + h->plt.offset + plt_off2);
1894 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1895 splt->contents + h->plt.offset + plt_off3);
1897 /* Fill in the entry in the global offset table. */
1898 bfd_put_32 (output_bfd,
1899 (splt->output_section->vma
1900 + splt->output_offset
1903 sgot->contents + got_offset);
1905 /* Fill in the entry in the .rela.plt section. */
1906 rela.r_offset = (sgot->output_section->vma
1907 + sgot->output_offset
1909 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1911 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1912 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1914 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1916 /* Mark the symbol as undefined, rather than as defined in
1917 the .plt section. Leave the value alone. */
1918 sym->st_shndx = SHN_UNDEF;
1922 if (h->got.offset != (bfd_vma) -1)
1926 Elf_Internal_Rela rela;
1929 /* This symbol has an entry in the global offset table. Set it
1932 sgot = bfd_get_section_by_name (dynobj, ".got");
1933 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1934 BFD_ASSERT (sgot != NULL && srela != NULL);
1936 rela.r_offset = (sgot->output_section->vma
1937 + sgot->output_offset
1938 + (h->got.offset &~ (bfd_vma) 1));
1940 /* If this is a -Bsymbolic link, and the symbol is defined
1941 locally, we just want to emit a RELATIVE reloc. Likewise if
1942 the symbol was forced to be local because of a version file.
1943 The entry in the global offset table will already have been
1944 initialized in the relocate_section function. */
1948 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
1949 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1951 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1952 rela.r_addend = bfd_get_signed_32 (output_bfd,
1954 + (h->got.offset &~ (bfd_vma) 1)));
1958 bfd_put_32 (output_bfd, (bfd_vma) 0,
1959 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
1960 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
1964 loc = srela->contents;
1965 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1966 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1969 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1972 Elf_Internal_Rela rela;
1975 /* This symbol needs a copy reloc. Set it up. */
1977 BFD_ASSERT (h->dynindx != -1
1978 && (h->root.type == bfd_link_hash_defined
1979 || h->root.type == bfd_link_hash_defweak));
1981 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1983 BFD_ASSERT (s != NULL);
1985 rela.r_offset = (h->root.u.def.value
1986 + h->root.u.def.section->output_section->vma
1987 + h->root.u.def.section->output_offset);
1988 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
1990 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1991 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1994 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1995 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1996 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1997 sym->st_shndx = SHN_ABS;
2002 /* Finish up the dynamic sections. */
2005 elf_m68k_finish_dynamic_sections (output_bfd, info)
2007 struct bfd_link_info *info;
2013 dynobj = elf_hash_table (info)->dynobj;
2015 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2016 BFD_ASSERT (sgot != NULL);
2017 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2019 if (elf_hash_table (info)->dynamic_sections_created)
2022 Elf32_External_Dyn *dyncon, *dynconend;
2024 splt = bfd_get_section_by_name (dynobj, ".plt");
2025 BFD_ASSERT (splt != NULL && sdyn != NULL);
2027 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2028 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2029 for (; dyncon < dynconend; dyncon++)
2031 Elf_Internal_Dyn dyn;
2035 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2048 s = bfd_get_section_by_name (output_bfd, name);
2049 BFD_ASSERT (s != NULL);
2050 dyn.d_un.d_ptr = s->vma;
2051 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2055 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2056 BFD_ASSERT (s != NULL);
2057 if (s->_cooked_size != 0)
2058 dyn.d_un.d_val = s->_cooked_size;
2060 dyn.d_un.d_val = s->_raw_size;
2061 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2065 /* The procedure linkage table relocs (DT_JMPREL) should
2066 not be included in the overall relocs (DT_RELA).
2067 Therefore, we override the DT_RELASZ entry here to
2068 make it not include the JMPREL relocs. Since the
2069 linker script arranges for .rela.plt to follow all
2070 other relocation sections, we don't have to worry
2071 about changing the DT_RELA entry. */
2072 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2075 if (s->_cooked_size != 0)
2076 dyn.d_un.d_val -= s->_cooked_size;
2078 dyn.d_un.d_val -= s->_raw_size;
2080 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2085 /* Fill in the first entry in the procedure linkage table. */
2086 if (splt->_raw_size > 0)
2088 if (!CPU32_FLAG (output_bfd))
2090 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2091 bfd_put_32 (output_bfd,
2092 (sgot->output_section->vma
2093 + sgot->output_offset + 4
2094 - (splt->output_section->vma + 2)),
2095 splt->contents + 4);
2096 bfd_put_32 (output_bfd,
2097 (sgot->output_section->vma
2098 + sgot->output_offset + 8
2099 - (splt->output_section->vma + 10)),
2100 splt->contents + 12);
2101 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2106 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2107 bfd_put_32 (output_bfd,
2108 (sgot->output_section->vma
2109 + sgot->output_offset + 4
2110 - (splt->output_section->vma + 2)),
2111 splt->contents + 4);
2112 bfd_put_32 (output_bfd,
2113 (sgot->output_section->vma
2114 + sgot->output_offset + 8
2115 - (splt->output_section->vma + 10)),
2116 splt->contents + 12);
2117 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2118 = PLT_CPU32_ENTRY_SIZE;
2123 /* Fill in the first three entries in the global offset table. */
2124 if (sgot->_raw_size > 0)
2127 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2129 bfd_put_32 (output_bfd,
2130 sdyn->output_section->vma + sdyn->output_offset,
2132 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2133 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2136 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2141 /* Given a .data section and a .emreloc in-memory section, store
2142 relocation information into the .emreloc section which can be
2143 used at runtime to relocate the section. This is called by the
2144 linker when the --embedded-relocs switch is used. This is called
2145 after the add_symbols entry point has been called for all the
2146 objects, and before the final_link entry point is called. */
2149 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2151 struct bfd_link_info *info;
2156 Elf_Internal_Shdr *symtab_hdr;
2157 Elf_Internal_Sym *isymbuf = NULL;
2158 Elf_Internal_Rela *internal_relocs = NULL;
2159 Elf_Internal_Rela *irel, *irelend;
2163 BFD_ASSERT (! info->relocateable);
2167 if (datasec->reloc_count == 0)
2170 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2172 /* Get a copy of the native relocations. */
2173 internal_relocs = (_bfd_elf_link_read_relocs
2174 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2175 info->keep_memory));
2176 if (internal_relocs == NULL)
2179 amt = (bfd_size_type) datasec->reloc_count * 12;
2180 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
2181 if (relsec->contents == NULL)
2184 p = relsec->contents;
2186 irelend = internal_relocs + datasec->reloc_count;
2187 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2189 asection *targetsec;
2191 /* We are going to write a four byte longword into the runtime
2192 reloc section. The longword will be the address in the data
2193 section which must be relocated. It is followed by the name
2194 of the target section NUL-padded or truncated to 8
2197 /* We can only relocate absolute longword relocs at run time. */
2198 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2200 *errmsg = _("unsupported reloc type");
2201 bfd_set_error (bfd_error_bad_value);
2205 /* Get the target section referred to by the reloc. */
2206 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2208 /* A local symbol. */
2209 Elf_Internal_Sym *isym;
2211 /* Read this BFD's local symbols if we haven't done so already. */
2212 if (isymbuf == NULL)
2214 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
2215 if (isymbuf == NULL)
2216 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
2217 symtab_hdr->sh_info, 0,
2219 if (isymbuf == NULL)
2223 isym = isymbuf + ELF32_R_SYM (irel->r_info);
2224 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
2229 struct elf_link_hash_entry *h;
2231 /* An external symbol. */
2232 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2233 h = elf_sym_hashes (abfd)[indx];
2234 BFD_ASSERT (h != NULL);
2235 if (h->root.type == bfd_link_hash_defined
2236 || h->root.type == bfd_link_hash_defweak)
2237 targetsec = h->root.u.def.section;
2242 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2243 memset (p + 4, 0, 8);
2244 if (targetsec != NULL)
2245 strncpy (p + 4, targetsec->output_section->name, 8);
2248 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2250 if (internal_relocs != NULL
2251 && elf_section_data (datasec)->relocs != internal_relocs)
2252 free (internal_relocs);
2256 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
2258 if (internal_relocs != NULL
2259 && elf_section_data (datasec)->relocs != internal_relocs)
2260 free (internal_relocs);
2264 static enum elf_reloc_type_class
2265 elf32_m68k_reloc_type_class (rela)
2266 const Elf_Internal_Rela *rela;
2268 switch ((int) ELF32_R_TYPE (rela->r_info))
2270 case R_68K_RELATIVE:
2271 return reloc_class_relative;
2272 case R_68K_JMP_SLOT:
2273 return reloc_class_plt;
2275 return reloc_class_copy;
2277 return reloc_class_normal;
2281 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2282 #define TARGET_BIG_NAME "elf32-m68k"
2283 #define ELF_MACHINE_CODE EM_68K
2284 #define ELF_MAXPAGESIZE 0x2000
2285 #define elf_backend_create_dynamic_sections \
2286 _bfd_elf_create_dynamic_sections
2287 #define bfd_elf32_bfd_link_hash_table_create \
2288 elf_m68k_link_hash_table_create
2289 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2291 #define elf_backend_check_relocs elf_m68k_check_relocs
2292 #define elf_backend_adjust_dynamic_symbol \
2293 elf_m68k_adjust_dynamic_symbol
2294 #define elf_backend_size_dynamic_sections \
2295 elf_m68k_size_dynamic_sections
2296 #define elf_backend_relocate_section elf_m68k_relocate_section
2297 #define elf_backend_finish_dynamic_symbol \
2298 elf_m68k_finish_dynamic_symbol
2299 #define elf_backend_finish_dynamic_sections \
2300 elf_m68k_finish_dynamic_sections
2301 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2302 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2303 #define bfd_elf32_bfd_merge_private_bfd_data \
2304 elf32_m68k_merge_private_bfd_data
2305 #define bfd_elf32_bfd_set_private_flags \
2306 elf32_m68k_set_private_flags
2307 #define bfd_elf32_bfd_print_private_bfd_data \
2308 elf32_m68k_print_private_bfd_data
2309 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
2311 #define elf_backend_can_gc_sections 1
2312 #define elf_backend_can_refcount 1
2313 #define elf_backend_want_got_plt 1
2314 #define elf_backend_plt_readonly 1
2315 #define elf_backend_want_plt_sym 0
2316 #define elf_backend_got_header_size 12
2317 #define elf_backend_rela_normal 1
2319 #include "elf32-target.h"