1 /* Motorola 68k series support for 32-bit ELF
2 Copyright 1993, 95, 96, 97, 98, 1999 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
27 static reloc_howto_type *reloc_type_lookup
28 PARAMS ((bfd *, bfd_reloc_code_real_type));
29 static void rtype_to_howto
30 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
31 static struct bfd_hash_entry *elf_m68k_link_hash_newfunc
32 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
33 static struct bfd_link_hash_table *elf_m68k_link_hash_table_create
35 static boolean elf_m68k_check_relocs
36 PARAMS ((bfd *, struct bfd_link_info *, asection *,
37 const Elf_Internal_Rela *));
38 static asection *elf_m68k_gc_mark_hook
39 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
40 struct elf_link_hash_entry *, Elf_Internal_Sym *));
41 static boolean elf_m68k_gc_sweep_hook
42 PARAMS ((bfd *, struct bfd_link_info *, asection *,
43 const Elf_Internal_Rela *));
44 static boolean elf_m68k_adjust_dynamic_symbol
45 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
46 static boolean elf_m68k_size_dynamic_sections
47 PARAMS ((bfd *, struct bfd_link_info *));
48 static boolean elf_m68k_relocate_section
49 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
50 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
51 static boolean elf_m68k_finish_dynamic_symbol
52 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
54 static boolean elf_m68k_finish_dynamic_sections
55 PARAMS ((bfd *, struct bfd_link_info *));
57 static boolean elf32_m68k_set_private_flags
58 PARAMS ((bfd *, flagword));
59 static boolean elf32_m68k_copy_private_bfd_data
60 PARAMS ((bfd *, bfd *));
61 static boolean elf32_m68k_merge_private_bfd_data
62 PARAMS ((bfd *, bfd *));
63 static boolean elf32_m68k_print_private_bfd_data
64 PARAMS ((bfd *, PTR));
66 static reloc_howto_type howto_table[] = {
67 HOWTO(R_68K_NONE, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", false, 0, 0x00000000,false),
68 HOWTO(R_68K_32, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0, 0xffffffff,false),
69 HOWTO(R_68K_16, 0, 1,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0, 0x0000ffff,false),
70 HOWTO(R_68K_8, 0, 0, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0, 0x000000ff,false),
71 HOWTO(R_68K_PC32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", false, 0, 0xffffffff,true),
72 HOWTO(R_68K_PC16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0, 0x0000ffff,true),
73 HOWTO(R_68K_PC8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0, 0x000000ff,true),
74 HOWTO(R_68K_GOT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0, 0xffffffff,true),
75 HOWTO(R_68K_GOT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0, 0x0000ffff,true),
76 HOWTO(R_68K_GOT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0, 0x000000ff,true),
77 HOWTO(R_68K_GOT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0, 0xffffffff,false),
78 HOWTO(R_68K_GOT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0, 0x0000ffff,false),
79 HOWTO(R_68K_GOT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0, 0x000000ff,false),
80 HOWTO(R_68K_PLT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0, 0xffffffff,true),
81 HOWTO(R_68K_PLT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0, 0x0000ffff,true),
82 HOWTO(R_68K_PLT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0, 0x000000ff,true),
83 HOWTO(R_68K_PLT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0, 0xffffffff,false),
84 HOWTO(R_68K_PLT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0, 0x0000ffff,false),
85 HOWTO(R_68K_PLT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", false, 0, 0x000000ff,false),
86 HOWTO(R_68K_COPY, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", false, 0, 0xffffffff,false),
87 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),
88 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),
89 HOWTO(R_68K_RELATIVE, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", false, 0, 0xffffffff,false),
90 /* GNU extension to record C++ vtable hierarchy */
91 HOWTO (R_68K_GNU_VTINHERIT, /* type */
93 2, /* size (0 = byte, 1 = short, 2 = long) */
95 false, /* pc_relative */
97 complain_overflow_dont, /* complain_on_overflow */
98 NULL, /* special_function */
99 "R_68K_GNU_VTINHERIT", /* name */
100 false, /* partial_inplace */
104 /* GNU extension to record C++ vtable member usage */
105 HOWTO (R_68K_GNU_VTENTRY, /* type */
107 2, /* size (0 = byte, 1 = short, 2 = long) */
109 false, /* pc_relative */
111 complain_overflow_dont, /* complain_on_overflow */
112 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
113 "R_68K_GNU_VTENTRY", /* name */
114 false, /* partial_inplace */
121 rtype_to_howto (abfd, cache_ptr, dst)
122 bfd *abfd ATTRIBUTE_UNUSED;
124 Elf_Internal_Rela *dst;
126 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max);
127 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
130 #define elf_info_to_howto rtype_to_howto
134 bfd_reloc_code_real_type bfd_val;
137 { BFD_RELOC_NONE, R_68K_NONE },
138 { BFD_RELOC_32, R_68K_32 },
139 { BFD_RELOC_16, R_68K_16 },
140 { BFD_RELOC_8, R_68K_8 },
141 { BFD_RELOC_32_PCREL, R_68K_PC32 },
142 { BFD_RELOC_16_PCREL, R_68K_PC16 },
143 { BFD_RELOC_8_PCREL, R_68K_PC8 },
144 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 },
145 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 },
146 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 },
147 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O },
148 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O },
149 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O },
150 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 },
151 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 },
152 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 },
153 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O },
154 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O },
155 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O },
156 { BFD_RELOC_NONE, R_68K_COPY },
157 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT },
158 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT },
159 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE },
160 { BFD_RELOC_CTOR, R_68K_32 },
161 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT },
162 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY },
165 static reloc_howto_type *
166 reloc_type_lookup (abfd, code)
167 bfd *abfd ATTRIBUTE_UNUSED;
168 bfd_reloc_code_real_type code;
171 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
173 if (reloc_map[i].bfd_val == code)
174 return &howto_table[reloc_map[i].elf_val];
179 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
180 #define ELF_ARCH bfd_arch_m68k
181 /* 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 /* m68k ELF linker hash table. */
279 struct elf_m68k_link_hash_table
281 struct elf_link_hash_table root;
284 /* Declare this now that the above structures are defined. */
286 static boolean elf_m68k_discard_copies
287 PARAMS ((struct elf_m68k_link_hash_entry *, PTR));
289 /* Traverse an m68k ELF linker hash table. */
291 #define elf_m68k_link_hash_traverse(table, func, info) \
292 (elf_link_hash_traverse \
294 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
297 /* Get the m68k ELF linker hash table from a link_info structure. */
299 #define elf_m68k_hash_table(p) \
300 ((struct elf_m68k_link_hash_table *) (p)->hash)
302 /* Create an entry in an m68k ELF linker hash table. */
304 static struct bfd_hash_entry *
305 elf_m68k_link_hash_newfunc (entry, table, string)
306 struct bfd_hash_entry *entry;
307 struct bfd_hash_table *table;
310 struct elf_m68k_link_hash_entry *ret =
311 (struct elf_m68k_link_hash_entry *) entry;
313 /* Allocate the structure if it has not already been allocated by a
315 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
316 ret = ((struct elf_m68k_link_hash_entry *)
317 bfd_hash_allocate (table,
318 sizeof (struct elf_m68k_link_hash_entry)));
319 if (ret == (struct elf_m68k_link_hash_entry *) NULL)
320 return (struct bfd_hash_entry *) ret;
322 /* Call the allocation method of the superclass. */
323 ret = ((struct elf_m68k_link_hash_entry *)
324 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
326 if (ret != (struct elf_m68k_link_hash_entry *) NULL)
328 ret->pcrel_relocs_copied = NULL;
331 return (struct bfd_hash_entry *) ret;
334 /* Create an m68k ELF linker hash table. */
336 static struct bfd_link_hash_table *
337 elf_m68k_link_hash_table_create (abfd)
340 struct elf_m68k_link_hash_table *ret;
342 ret = ((struct elf_m68k_link_hash_table *)
343 bfd_alloc (abfd, sizeof (struct elf_m68k_link_hash_table)));
344 if (ret == (struct elf_m68k_link_hash_table *) NULL)
347 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
348 elf_m68k_link_hash_newfunc))
350 bfd_release (abfd, ret);
354 return &ret->root.root;
357 /* Keep m68k-specific flags in the ELF header */
359 elf32_m68k_set_private_flags (abfd, flags)
363 elf_elfheader (abfd)->e_flags = flags;
364 elf_flags_init (abfd) = true;
368 /* Copy m68k-specific data from one module to another */
370 elf32_m68k_copy_private_bfd_data (ibfd, obfd)
376 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
377 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
380 in_flags = elf_elfheader (ibfd)->e_flags;
382 elf_elfheader (obfd)->e_flags = in_flags;
383 elf_flags_init (obfd) = true;
388 /* Merge backend specific data from an object file to the output
389 object file when linking. */
391 elf32_m68k_merge_private_bfd_data (ibfd, obfd)
398 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
399 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
402 in_flags = elf_elfheader (ibfd)->e_flags;
403 out_flags = elf_elfheader (obfd)->e_flags;
405 if (!elf_flags_init (obfd))
407 elf_flags_init (obfd) = true;
408 elf_elfheader (obfd)->e_flags = in_flags;
414 /* Display the flags field */
416 elf32_m68k_print_private_bfd_data (abfd, ptr)
420 FILE *file = (FILE *) ptr;
422 BFD_ASSERT (abfd != NULL && ptr != NULL);
424 /* Print normal ELF private data. */
425 _bfd_elf_print_private_bfd_data (abfd, ptr);
427 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
429 /* xgettext:c-format */
430 fprintf (file, _ ("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
432 if (elf_elfheader (abfd)->e_flags & EF_CPU32)
433 fprintf (file, _ (" [cpu32]"));
439 /* Look through the relocs for a section during the first phase, and
440 allocate space in the global offset table or procedure linkage
444 elf_m68k_check_relocs (abfd, info, sec, relocs)
446 struct bfd_link_info *info;
448 const Elf_Internal_Rela *relocs;
451 Elf_Internal_Shdr *symtab_hdr;
452 struct elf_link_hash_entry **sym_hashes;
453 bfd_signed_vma *local_got_refcounts;
454 const Elf_Internal_Rela *rel;
455 const Elf_Internal_Rela *rel_end;
460 if (info->relocateable)
463 dynobj = elf_hash_table (info)->dynobj;
464 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
465 sym_hashes = elf_sym_hashes (abfd);
466 local_got_refcounts = elf_local_got_refcounts (abfd);
472 rel_end = relocs + sec->reloc_count;
473 for (rel = relocs; rel < rel_end; rel++)
475 unsigned long r_symndx;
476 struct elf_link_hash_entry *h;
478 r_symndx = ELF32_R_SYM (rel->r_info);
480 if (r_symndx < symtab_hdr->sh_info)
483 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
485 switch (ELF32_R_TYPE (rel->r_info))
491 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
497 /* This symbol requires a global offset table entry. */
501 /* Create the .got section. */
502 elf_hash_table (info)->dynobj = dynobj = abfd;
503 if (!_bfd_elf_create_got_section (dynobj, info))
509 sgot = bfd_get_section_by_name (dynobj, ".got");
510 BFD_ASSERT (sgot != NULL);
514 && (h != NULL || info->shared))
516 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
519 srelgot = bfd_make_section (dynobj, ".rela.got");
521 || !bfd_set_section_flags (dynobj, srelgot,
528 || !bfd_set_section_alignment (dynobj, srelgot, 2))
535 if (h->got.refcount == -1)
539 /* Make sure this symbol is output as a dynamic symbol. */
540 if (h->dynindx == -1)
542 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
546 /* Allocate space in the .got section. */
547 sgot->_raw_size += 4;
548 /* Allocate relocation space. */
549 srelgot->_raw_size += sizeof (Elf32_External_Rela);
556 /* This is a global offset table entry for a local symbol. */
557 if (local_got_refcounts == NULL)
561 size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
562 local_got_refcounts = ((bfd_signed_vma *)
563 bfd_alloc (abfd, size));
564 if (local_got_refcounts == NULL)
566 elf_local_got_refcounts (abfd) = local_got_refcounts;
567 memset (local_got_refcounts, -1, size);
569 if (local_got_refcounts[r_symndx] == -1)
571 local_got_refcounts[r_symndx] = 1;
573 sgot->_raw_size += 4;
576 /* If we are generating a shared object, we need to
577 output a R_68K_RELATIVE reloc so that the dynamic
578 linker can adjust this GOT entry. */
579 srelgot->_raw_size += sizeof (Elf32_External_Rela);
583 local_got_refcounts[r_symndx]++;
590 /* This symbol requires a procedure linkage table entry. We
591 actually build the entry in adjust_dynamic_symbol,
592 because this might be a case of linking PIC code which is
593 never referenced by a dynamic object, in which case we
594 don't need to generate a procedure linkage table entry
597 /* If this is a local symbol, we resolve it directly without
598 creating a procedure linkage table entry. */
602 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
603 if (h->plt.refcount == -1)
612 /* This symbol requires a procedure linkage table entry. */
616 /* It does not make sense to have this relocation for a
617 local symbol. FIXME: does it? How to handle it if
618 it does make sense? */
619 bfd_set_error (bfd_error_bad_value);
623 /* Make sure this symbol is output as a dynamic symbol. */
624 if (h->dynindx == -1)
626 if (!bfd_elf32_link_record_dynamic_symbol (info, h))
630 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
631 if (h->plt.refcount == -1)
640 /* If we are creating a shared library and this is not a local
641 symbol, we need to copy the reloc into the shared library.
642 However when linking with -Bsymbolic and this is a global
643 symbol which is defined in an object we are including in the
644 link (i.e., DEF_REGULAR is set), then we can resolve the
645 reloc directly. At this point we have not seen all the input
646 files, so it is possible that DEF_REGULAR is not set now but
647 will be set later (it is never cleared). We account for that
648 possibility below by storing information in the
649 pcrel_relocs_copied field of the hash table entry. */
651 && (sec->flags & SEC_ALLOC) != 0
654 || (h->elf_link_hash_flags
655 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
659 /* Make sure a plt entry is created for this symbol if
660 it turns out to be a function defined by a dynamic
662 if (h->plt.refcount == -1)
675 /* Make sure a plt entry is created for this symbol if it
676 turns out to be a function defined by a dynamic object. */
677 if (h->plt.refcount == -1)
683 /* If we are creating a shared library, we need to copy the
684 reloc into the shared library. */
686 && (sec->flags & SEC_ALLOC) != 0)
688 /* When creating a shared object, we must copy these
689 reloc types into the output file. We create a reloc
690 section in dynobj and make room for this reloc. */
695 name = (bfd_elf_string_from_elf_section
697 elf_elfheader (abfd)->e_shstrndx,
698 elf_section_data (sec)->rel_hdr.sh_name));
702 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
703 && strcmp (bfd_get_section_name (abfd, sec),
706 sreloc = bfd_get_section_by_name (dynobj, name);
709 sreloc = bfd_make_section (dynobj, name);
711 || !bfd_set_section_flags (dynobj, sreloc,
718 || !bfd_set_section_alignment (dynobj, sreloc, 2))
723 sreloc->_raw_size += sizeof (Elf32_External_Rela);
725 /* If we are linking with -Bsymbolic, we count the number of
726 PC relative relocations we have entered for this symbol,
727 so that we can discard them again if the symbol is later
728 defined by a regular object. Note that this function is
729 only called if we are using an m68kelf linker hash table,
730 which means that h is really a pointer to an
731 elf_m68k_link_hash_entry. */
732 if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8
733 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
734 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
737 struct elf_m68k_link_hash_entry *eh;
738 struct elf_m68k_pcrel_relocs_copied *p;
740 eh = (struct elf_m68k_link_hash_entry *) h;
742 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
743 if (p->section == sreloc)
748 p = ((struct elf_m68k_pcrel_relocs_copied *)
749 bfd_alloc (dynobj, sizeof *p));
752 p->next = eh->pcrel_relocs_copied;
753 eh->pcrel_relocs_copied = p;
764 /* This relocation describes the C++ object vtable hierarchy.
765 Reconstruct it for later use during GC. */
766 case R_68K_GNU_VTINHERIT:
767 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
771 /* This relocation describes which C++ vtable entries are actually
772 used. Record for later use during GC. */
773 case R_68K_GNU_VTENTRY:
774 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
786 /* Return the section that should be marked against GC for a given
790 elf_m68k_gc_mark_hook (abfd, info, rel, h, sym)
792 struct bfd_link_info *info ATTRIBUTE_UNUSED;
793 Elf_Internal_Rela *rel;
794 struct elf_link_hash_entry *h;
795 Elf_Internal_Sym *sym;
799 switch (ELF32_R_TYPE (rel->r_info))
801 case R_68K_GNU_VTINHERIT:
802 case R_68K_GNU_VTENTRY:
806 switch (h->root.type)
811 case bfd_link_hash_defined:
812 case bfd_link_hash_defweak:
813 return h->root.u.def.section;
815 case bfd_link_hash_common:
816 return h->root.u.c.p->section;
822 if (!(elf_bad_symtab (abfd)
823 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
824 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
825 && sym->st_shndx != SHN_COMMON))
827 return bfd_section_from_elf_index (abfd, sym->st_shndx);
834 /* Update the got entry reference counts for the section being removed. */
837 elf_m68k_gc_sweep_hook (abfd, info, sec, relocs)
839 struct bfd_link_info *info;
841 const Elf_Internal_Rela *relocs;
843 Elf_Internal_Shdr *symtab_hdr;
844 struct elf_link_hash_entry **sym_hashes;
845 bfd_signed_vma *local_got_refcounts;
846 const Elf_Internal_Rela *rel, *relend;
847 unsigned long r_symndx;
848 struct elf_link_hash_entry *h;
853 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
854 sym_hashes = elf_sym_hashes (abfd);
855 local_got_refcounts = elf_local_got_refcounts (abfd);
857 dynobj = elf_hash_table (info)->dynobj;
861 sgot = bfd_get_section_by_name (dynobj, ".got");
862 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
864 relend = relocs + sec->reloc_count;
865 for (rel = relocs; rel < relend; rel++)
867 switch (ELF32_R_TYPE (rel->r_info))
875 r_symndx = ELF32_R_SYM (rel->r_info);
876 if (r_symndx >= symtab_hdr->sh_info)
878 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
879 if (h->got.refcount > 0)
882 if (h->got.refcount == 0)
884 /* We don't need the .got entry any more. */
885 sgot->_raw_size -= 4;
886 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
890 else if (local_got_refcounts != NULL)
892 if (local_got_refcounts[r_symndx] > 0)
894 --local_got_refcounts[r_symndx];
895 if (local_got_refcounts[r_symndx] == 0)
897 /* We don't need the .got entry any more. */
898 sgot->_raw_size -= 4;
900 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
918 r_symndx = ELF32_R_SYM (rel->r_info);
919 if (r_symndx >= symtab_hdr->sh_info)
921 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
922 if (h->plt.refcount > 0)
935 /* Adjust a symbol defined by a dynamic object and referenced by a
936 regular object. The current definition is in some section of the
937 dynamic object, but we're not including those sections. We have to
938 change the definition to something the rest of the link can
942 elf_m68k_adjust_dynamic_symbol (info, h)
943 struct bfd_link_info *info;
944 struct elf_link_hash_entry *h;
948 unsigned int power_of_two;
950 dynobj = elf_hash_table (info)->dynobj;
952 /* Make sure we know what is going on here. */
953 BFD_ASSERT (dynobj != NULL
954 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
955 || h->weakdef != NULL
956 || ((h->elf_link_hash_flags
957 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
958 && (h->elf_link_hash_flags
959 & ELF_LINK_HASH_REF_REGULAR) != 0
960 && (h->elf_link_hash_flags
961 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
963 /* If this is a function, put it in the procedure linkage table. We
964 will fill in the contents of the procedure linkage table later,
965 when we know the address of the .got section. */
966 if (h->type == STT_FUNC
967 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
970 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
971 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
972 /* We must always create the plt entry if it was referenced
973 by a PLTxxO relocation. In this case we already recorded
974 it as a dynamic symbol. */
977 /* This case can occur if we saw a PLTxx reloc in an input
978 file, but the symbol was never referred to by a dynamic
979 object. In such a case, we don't actually need to build
980 a procedure linkage table, and we can just do a PCxx
982 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
983 h->plt.offset = (bfd_vma) -1;
987 /* GC may have rendered this entry unused. */
988 if (h->plt.refcount <= 0)
990 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
991 h->plt.offset = (bfd_vma) -1;
995 /* Make sure this symbol is output as a dynamic symbol. */
996 if (h->dynindx == -1)
998 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1002 s = bfd_get_section_by_name (dynobj, ".plt");
1003 BFD_ASSERT (s != NULL);
1005 /* If this is the first .plt entry, make room for the special
1007 if (s->_raw_size == 0)
1009 if (CPU32_FLAG (dynobj))
1010 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1012 s->_raw_size += PLT_ENTRY_SIZE;
1015 /* If this symbol is not defined in a regular file, and we are
1016 not generating a shared library, then set the symbol to this
1017 location in the .plt. This is required to make function
1018 pointers compare as equal between the normal executable and
1019 the shared library. */
1021 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1023 h->root.u.def.section = s;
1024 h->root.u.def.value = s->_raw_size;
1027 h->plt.offset = s->_raw_size;
1029 /* Make room for this entry. */
1030 if (CPU32_FLAG (dynobj))
1031 s->_raw_size += PLT_CPU32_ENTRY_SIZE;
1033 s->_raw_size += PLT_ENTRY_SIZE;
1035 /* We also need to make an entry in the .got.plt section, which
1036 will be placed in the .got section by the linker script. */
1038 s = bfd_get_section_by_name (dynobj, ".got.plt");
1039 BFD_ASSERT (s != NULL);
1042 /* We also need to make an entry in the .rela.plt section. */
1044 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1045 BFD_ASSERT (s != NULL);
1046 s->_raw_size += sizeof (Elf32_External_Rela);
1051 /* Reinitialize the plt offset now that it is not used as a reference
1053 h->plt.offset = (bfd_vma) -1;
1055 /* If this is a weak symbol, and there is a real definition, the
1056 processor independent code will have arranged for us to see the
1057 real definition first, and we can just use the same value. */
1058 if (h->weakdef != NULL)
1060 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1061 || h->weakdef->root.type == bfd_link_hash_defweak);
1062 h->root.u.def.section = h->weakdef->root.u.def.section;
1063 h->root.u.def.value = h->weakdef->root.u.def.value;
1067 /* This is a reference to a symbol defined by a dynamic object which
1068 is not a function. */
1070 /* If we are creating a shared library, we must presume that the
1071 only references to the symbol are via the global offset table.
1072 For such cases we need not do anything here; the relocations will
1073 be handled correctly by relocate_section. */
1077 /* We must allocate the symbol in our .dynbss section, which will
1078 become part of the .bss section of the executable. There will be
1079 an entry for this symbol in the .dynsym section. The dynamic
1080 object will contain position independent code, so all references
1081 from the dynamic object to this symbol will go through the global
1082 offset table. The dynamic linker will use the .dynsym entry to
1083 determine the address it must put in the global offset table, so
1084 both the dynamic object and the regular object will refer to the
1085 same memory location for the variable. */
1087 s = bfd_get_section_by_name (dynobj, ".dynbss");
1088 BFD_ASSERT (s != NULL);
1090 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
1091 copy the initial value out of the dynamic object and into the
1092 runtime process image. We need to remember the offset into the
1093 .rela.bss section we are going to use. */
1094 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1098 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1099 BFD_ASSERT (srel != NULL);
1100 srel->_raw_size += sizeof (Elf32_External_Rela);
1101 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1104 /* We need to figure out the alignment required for this symbol. I
1105 have no idea how ELF linkers handle this. */
1106 power_of_two = bfd_log2 (h->size);
1107 if (power_of_two > 3)
1110 /* Apply the required alignment. */
1111 s->_raw_size = BFD_ALIGN (s->_raw_size,
1112 (bfd_size_type) (1 << power_of_two));
1113 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1115 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1119 /* Define the symbol as being at this point in the section. */
1120 h->root.u.def.section = s;
1121 h->root.u.def.value = s->_raw_size;
1123 /* Increment the section size to make room for the symbol. */
1124 s->_raw_size += h->size;
1129 /* Set the sizes of the dynamic sections. */
1132 elf_m68k_size_dynamic_sections (output_bfd, info)
1134 struct bfd_link_info *info;
1142 dynobj = elf_hash_table (info)->dynobj;
1143 BFD_ASSERT (dynobj != NULL);
1145 if (elf_hash_table (info)->dynamic_sections_created)
1147 /* Set the contents of the .interp section to the interpreter. */
1150 s = bfd_get_section_by_name (dynobj, ".interp");
1151 BFD_ASSERT (s != NULL);
1152 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1153 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1158 /* We may have created entries in the .rela.got section.
1159 However, if we are not creating the dynamic sections, we will
1160 not actually use these entries. Reset the size of .rela.got,
1161 which will cause it to get stripped from the output file
1163 s = bfd_get_section_by_name (dynobj, ".rela.got");
1168 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1169 relative relocs against symbols defined in a regular object. We
1170 allocated space for them in the check_relocs routine, but we will not
1171 fill them in in the relocate_section routine. */
1172 if (info->shared && info->symbolic)
1173 elf_m68k_link_hash_traverse (elf_m68k_hash_table (info),
1174 elf_m68k_discard_copies,
1177 /* The check_relocs and adjust_dynamic_symbol entry points have
1178 determined the sizes of the various dynamic sections. Allocate
1183 for (s = dynobj->sections; s != NULL; s = s->next)
1188 if ((s->flags & SEC_LINKER_CREATED) == 0)
1191 /* It's OK to base decisions on the section name, because none
1192 of the dynobj section names depend upon the input files. */
1193 name = bfd_get_section_name (dynobj, s);
1197 if (strcmp (name, ".plt") == 0)
1199 if (s->_raw_size == 0)
1201 /* Strip this section if we don't need it; see the
1207 /* Remember whether there is a PLT. */
1211 else if (strncmp (name, ".rela", 5) == 0)
1213 if (s->_raw_size == 0)
1215 /* If we don't need this section, strip it from the
1216 output file. This is mostly to handle .rela.bss and
1217 .rela.plt. We must create both sections in
1218 create_dynamic_sections, because they must be created
1219 before the linker maps input sections to output
1220 sections. The linker does that before
1221 adjust_dynamic_symbol is called, and it is that
1222 function which decides whether anything needs to go
1223 into these sections. */
1230 /* Remember whether there are any reloc sections other
1232 if (strcmp (name, ".rela.plt") != 0)
1234 const char *outname;
1238 /* If this relocation section applies to a read only
1239 section, then we probably need a DT_TEXTREL
1240 entry. .rela.plt is actually associated with
1241 .got.plt, which is never readonly. */
1242 outname = bfd_get_section_name (output_bfd,
1244 target = bfd_get_section_by_name (output_bfd, outname + 5);
1246 && (target->flags & SEC_READONLY) != 0
1247 && (target->flags & SEC_ALLOC) != 0)
1251 /* We use the reloc_count field as a counter if we need
1252 to copy relocs into the output file. */
1256 else if (strncmp (name, ".got", 4) != 0)
1258 /* It's not one of our sections, so don't allocate space. */
1264 _bfd_strip_section_from_output (info, s);
1268 /* Allocate memory for the section contents. */
1269 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
1270 Unused entries should be reclaimed before the section's contents
1271 are written out, but at the moment this does not happen. Thus in
1272 order to prevent writing out garbage, we initialise the section's
1273 contents to zero. */
1274 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1275 if (s->contents == NULL && s->_raw_size != 0)
1279 if (elf_hash_table (info)->dynamic_sections_created)
1281 /* Add some entries to the .dynamic section. We fill in the
1282 values later, in elf_m68k_finish_dynamic_sections, but we
1283 must add the entries now so that we get the correct size for
1284 the .dynamic section. The DT_DEBUG entry is filled in by the
1285 dynamic linker and used by the debugger. */
1288 if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
1294 if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
1295 || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
1296 || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
1297 || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
1303 if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
1304 || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
1305 || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
1306 sizeof (Elf32_External_Rela)))
1312 if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
1314 info->flags |= DF_TEXTREL;
1321 /* This function is called via elf_m68k_link_hash_traverse if we are
1322 creating a shared object with -Bsymbolic. It discards the space
1323 allocated to copy PC relative relocs against symbols which are defined
1324 in regular objects. We allocated space for them in the check_relocs
1325 routine, but we won't fill them in in the relocate_section routine. */
1329 elf_m68k_discard_copies (h, ignore)
1330 struct elf_m68k_link_hash_entry *h;
1331 PTR ignore ATTRIBUTE_UNUSED;
1333 struct elf_m68k_pcrel_relocs_copied *s;
1335 /* We only discard relocs for symbols defined in a regular object. */
1336 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1339 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1340 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1345 /* Relocate an M68K ELF section. */
1348 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
1349 contents, relocs, local_syms, local_sections)
1351 struct bfd_link_info *info;
1353 asection *input_section;
1355 Elf_Internal_Rela *relocs;
1356 Elf_Internal_Sym *local_syms;
1357 asection **local_sections;
1360 Elf_Internal_Shdr *symtab_hdr;
1361 struct elf_link_hash_entry **sym_hashes;
1362 bfd_vma *local_got_offsets;
1366 Elf_Internal_Rela *rel;
1367 Elf_Internal_Rela *relend;
1369 dynobj = elf_hash_table (info)->dynobj;
1370 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1371 sym_hashes = elf_sym_hashes (input_bfd);
1372 local_got_offsets = elf_local_got_offsets (input_bfd);
1379 relend = relocs + input_section->reloc_count;
1380 for (; rel < relend; rel++)
1383 reloc_howto_type *howto;
1384 unsigned long r_symndx;
1385 struct elf_link_hash_entry *h;
1386 Elf_Internal_Sym *sym;
1389 bfd_reloc_status_type r;
1391 r_type = ELF32_R_TYPE (rel->r_info);
1392 if (r_type < 0 || r_type >= (int) R_68K_max)
1394 bfd_set_error (bfd_error_bad_value);
1397 howto = howto_table + r_type;
1399 r_symndx = ELF32_R_SYM (rel->r_info);
1401 if (info->relocateable)
1403 /* This is a relocateable link. We don't have to change
1404 anything, unless the reloc is against a section symbol,
1405 in which case we have to adjust according to where the
1406 section symbol winds up in the output section. */
1407 if (r_symndx < symtab_hdr->sh_info)
1409 sym = local_syms + r_symndx;
1410 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1412 sec = local_sections[r_symndx];
1413 rel->r_addend += sec->output_offset + sym->st_value;
1420 /* This is a final link. */
1424 if (r_symndx < symtab_hdr->sh_info)
1426 sym = local_syms + r_symndx;
1427 sec = local_sections[r_symndx];
1428 relocation = (sec->output_section->vma
1429 + sec->output_offset
1434 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1435 while (h->root.type == bfd_link_hash_indirect
1436 || h->root.type == bfd_link_hash_warning)
1437 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1438 if (h->root.type == bfd_link_hash_defined
1439 || h->root.type == bfd_link_hash_defweak)
1441 sec = h->root.u.def.section;
1442 if (((r_type == R_68K_PLT8
1443 || r_type == R_68K_PLT16
1444 || r_type == R_68K_PLT32
1445 || r_type == R_68K_PLT8O
1446 || r_type == R_68K_PLT16O
1447 || r_type == R_68K_PLT32O)
1448 && h->plt.offset != (bfd_vma) -1
1449 && elf_hash_table (info)->dynamic_sections_created)
1450 || ((r_type == R_68K_GOT8O
1451 || r_type == R_68K_GOT16O
1452 || r_type == R_68K_GOT32O
1453 || ((r_type == R_68K_GOT8
1454 || r_type == R_68K_GOT16
1455 || r_type == R_68K_GOT32)
1456 && strcmp (h->root.root.string,
1457 "_GLOBAL_OFFSET_TABLE_") != 0))
1458 && elf_hash_table (info)->dynamic_sections_created
1460 || (! info->symbolic && h->dynindx != -1)
1461 || (h->elf_link_hash_flags
1462 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1464 && ((! info->symbolic && h->dynindx != -1)
1465 || (h->elf_link_hash_flags
1466 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1467 && (input_section->flags & SEC_ALLOC) != 0
1468 && (r_type == R_68K_8
1469 || r_type == R_68K_16
1470 || r_type == R_68K_32
1471 || r_type == R_68K_PC8
1472 || r_type == R_68K_PC16
1473 || r_type == R_68K_PC32)))
1475 /* In these cases, we don't need the relocation
1476 value. We check specially because in some
1477 obscure cases sec->output_section will be NULL. */
1481 relocation = (h->root.u.def.value
1482 + sec->output_section->vma
1483 + sec->output_offset);
1485 else if (h->root.type == bfd_link_hash_undefweak)
1487 else if (info->shared && !info->symbolic
1488 && !info->no_undefined
1489 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1493 if (!(info->callbacks->undefined_symbol
1494 (info, h->root.root.string, input_bfd,
1495 input_section, rel->r_offset,
1496 (!info->shared || info->no_undefined
1497 || ELF_ST_VISIBILITY (h->other)))))
1508 /* Relocation is to the address of the entry for this symbol
1509 in the global offset table. */
1511 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1517 /* Relocation is the offset of the entry for this symbol in
1518 the global offset table. */
1525 sgot = bfd_get_section_by_name (dynobj, ".got");
1526 BFD_ASSERT (sgot != NULL);
1531 off = h->got.offset;
1532 BFD_ASSERT (off != (bfd_vma) -1);
1534 if (!elf_hash_table (info)->dynamic_sections_created
1536 && (info->symbolic || h->dynindx == -1)
1537 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1539 /* This is actually a static link, or it is a
1540 -Bsymbolic link and the symbol is defined
1541 locally, or the symbol was forced to be local
1542 because of a version file.. We must initialize
1543 this entry in the global offset table. Since
1544 the offset must always be a multiple of 4, we
1545 use the least significant bit to record whether
1546 we have initialized it already.
1548 When doing a dynamic link, we create a .rela.got
1549 relocation entry to initialize the value. This
1550 is done in the finish_dynamic_symbol routine. */
1555 bfd_put_32 (output_bfd, relocation,
1556 sgot->contents + off);
1563 BFD_ASSERT (local_got_offsets != NULL
1564 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1566 off = local_got_offsets[r_symndx];
1568 /* The offset must always be a multiple of 4. We use
1569 the least significant bit to record whether we have
1570 already generated the necessary reloc. */
1575 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1580 Elf_Internal_Rela outrel;
1582 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1583 BFD_ASSERT (srelgot != NULL);
1585 outrel.r_offset = (sgot->output_section->vma
1586 + sgot->output_offset
1588 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1589 outrel.r_addend = relocation;
1590 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1591 (((Elf32_External_Rela *)
1593 + srelgot->reloc_count));
1594 ++srelgot->reloc_count;
1597 local_got_offsets[r_symndx] |= 1;
1601 relocation = sgot->output_offset + off;
1602 if (r_type == R_68K_GOT8O
1603 || r_type == R_68K_GOT16O
1604 || r_type == R_68K_GOT32O)
1606 /* This relocation does not use the addend. */
1610 relocation += sgot->output_section->vma;
1617 /* Relocation is to the entry for this symbol in the
1618 procedure linkage table. */
1620 /* Resolve a PLTxx reloc against a local symbol directly,
1621 without using the procedure linkage table. */
1625 if (h->plt.offset == (bfd_vma) -1
1626 || !elf_hash_table (info)->dynamic_sections_created)
1628 /* We didn't make a PLT entry for this symbol. This
1629 happens when statically linking PIC code, or when
1630 using -Bsymbolic. */
1636 splt = bfd_get_section_by_name (dynobj, ".plt");
1637 BFD_ASSERT (splt != NULL);
1640 relocation = (splt->output_section->vma
1641 + splt->output_offset
1648 /* Relocation is the offset of the entry for this symbol in
1649 the procedure linkage table. */
1650 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
1654 splt = bfd_get_section_by_name (dynobj, ".plt");
1655 BFD_ASSERT (splt != NULL);
1658 relocation = h->plt.offset;
1660 /* This relocation does not use the addend. */
1675 && (input_section->flags & SEC_ALLOC) != 0
1676 && ((r_type != R_68K_PC8
1677 && r_type != R_68K_PC16
1678 && r_type != R_68K_PC32)
1680 || (h->elf_link_hash_flags
1681 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1683 Elf_Internal_Rela outrel;
1684 boolean skip, relocate;
1686 /* When generating a shared object, these relocations
1687 are copied into the output file to be resolved at run
1694 name = (bfd_elf_string_from_elf_section
1696 elf_elfheader (input_bfd)->e_shstrndx,
1697 elf_section_data (input_section)->rel_hdr.sh_name));
1701 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1702 && strcmp (bfd_get_section_name (input_bfd,
1706 sreloc = bfd_get_section_by_name (dynobj, name);
1707 BFD_ASSERT (sreloc != NULL);
1712 if (elf_section_data (input_section)->stab_info == NULL)
1713 outrel.r_offset = rel->r_offset;
1718 off = (_bfd_stab_section_offset
1719 (output_bfd, &elf_hash_table (info)->stab_info,
1721 &elf_section_data (input_section)->stab_info,
1723 if (off == (bfd_vma) -1)
1725 outrel.r_offset = off;
1728 outrel.r_offset += (input_section->output_section->vma
1729 + input_section->output_offset);
1733 memset (&outrel, 0, sizeof outrel);
1736 /* h->dynindx may be -1 if the symbol was marked to
1739 && ((! info->symbolic && h->dynindx != -1)
1740 || (h->elf_link_hash_flags
1741 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1743 BFD_ASSERT (h->dynindx != -1);
1745 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1746 outrel.r_addend = relocation + rel->r_addend;
1750 if (r_type == R_68K_32)
1753 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1754 outrel.r_addend = relocation + rel->r_addend;
1761 sec = local_sections[r_symndx];
1764 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1766 == bfd_link_hash_defweak));
1767 sec = h->root.u.def.section;
1769 if (sec != NULL && bfd_is_abs_section (sec))
1771 else if (sec == NULL || sec->owner == NULL)
1773 bfd_set_error (bfd_error_bad_value);
1780 osec = sec->output_section;
1781 indx = elf_section_data (osec)->dynindx;
1782 BFD_ASSERT (indx > 0);
1786 outrel.r_info = ELF32_R_INFO (indx, r_type);
1787 outrel.r_addend = relocation + rel->r_addend;
1791 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1792 (((Elf32_External_Rela *)
1794 + sreloc->reloc_count));
1795 ++sreloc->reloc_count;
1797 /* This reloc will be computed at runtime, so there's no
1798 need to do anything now, except for R_68K_32
1799 relocations that have been turned into
1807 case R_68K_GNU_VTINHERIT:
1808 case R_68K_GNU_VTENTRY:
1809 /* These are no-ops in the end. */
1816 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1817 contents, rel->r_offset,
1818 relocation, rel->r_addend);
1820 if (r != bfd_reloc_ok)
1825 case bfd_reloc_outofrange:
1827 case bfd_reloc_overflow:
1832 name = h->root.root.string;
1835 name = bfd_elf_string_from_elf_section (input_bfd,
1836 symtab_hdr->sh_link,
1841 name = bfd_section_name (input_bfd, sec);
1843 if (!(info->callbacks->reloc_overflow
1844 (info, name, howto->name, (bfd_vma) 0,
1845 input_bfd, input_section, rel->r_offset)))
1856 /* Finish up dynamic symbol handling. We set the contents of various
1857 dynamic sections here. */
1860 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
1862 struct bfd_link_info *info;
1863 struct elf_link_hash_entry *h;
1864 Elf_Internal_Sym *sym;
1867 int plt_off1, plt_off2, plt_off3;
1869 dynobj = elf_hash_table (info)->dynobj;
1871 if (h->plt.offset != (bfd_vma) -1)
1878 Elf_Internal_Rela rela;
1880 /* This symbol has an entry in the procedure linkage table. Set
1883 BFD_ASSERT (h->dynindx != -1);
1885 splt = bfd_get_section_by_name (dynobj, ".plt");
1886 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1887 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1888 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1890 /* Get the index in the procedure linkage table which
1891 corresponds to this symbol. This is the index of this symbol
1892 in all the symbols for which we are making plt entries. The
1893 first entry in the procedure linkage table is reserved. */
1894 if ( CPU32_FLAG (output_bfd))
1895 plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1;
1897 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1899 /* Get the offset into the .got table of the entry that
1900 corresponds to this function. Each .got entry is 4 bytes.
1901 The first three are reserved. */
1902 got_offset = (plt_index + 3) * 4;
1904 if ( CPU32_FLAG (output_bfd))
1906 /* Fill in the entry in the procedure linkage table. */
1907 memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry,
1908 PLT_CPU32_ENTRY_SIZE);
1915 /* Fill in the entry in the procedure linkage table. */
1916 memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry,
1923 /* The offset is relative to the first extension word. */
1924 bfd_put_32 (output_bfd,
1925 (sgot->output_section->vma
1926 + sgot->output_offset
1928 - (splt->output_section->vma
1929 + h->plt.offset + 2)),
1930 splt->contents + h->plt.offset + plt_off1);
1932 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1933 splt->contents + h->plt.offset + plt_off2);
1934 bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3),
1935 splt->contents + h->plt.offset + plt_off3);
1937 /* Fill in the entry in the global offset table. */
1938 bfd_put_32 (output_bfd,
1939 (splt->output_section->vma
1940 + splt->output_offset
1943 sgot->contents + got_offset);
1945 /* Fill in the entry in the .rela.plt section. */
1946 rela.r_offset = (sgot->output_section->vma
1947 + sgot->output_offset
1949 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
1951 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1952 ((Elf32_External_Rela *) srela->contents
1955 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1957 /* Mark the symbol as undefined, rather than as defined in
1958 the .plt section. Leave the value alone. */
1959 sym->st_shndx = SHN_UNDEF;
1963 if (h->got.offset != (bfd_vma) -1)
1967 Elf_Internal_Rela rela;
1969 /* This symbol has an entry in the global offset table. Set it
1972 sgot = bfd_get_section_by_name (dynobj, ".got");
1973 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1974 BFD_ASSERT (sgot != NULL && srela != NULL);
1976 rela.r_offset = (sgot->output_section->vma
1977 + sgot->output_offset
1978 + (h->got.offset &~ 1));
1980 /* If this is a -Bsymbolic link, and the symbol is defined
1981 locally, we just want to emit a RELATIVE reloc. Likewise if
1982 the symbol was forced to be local because of a version file.
1983 The entry in the global offset table will already have been
1984 initialized in the relocate_section function. */
1986 && (info->symbolic || h->dynindx == -1)
1987 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
1989 rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
1990 rela.r_addend = bfd_get_signed_32 (output_bfd,
1992 + (h->got.offset & ~1)));
1996 bfd_put_32 (output_bfd, (bfd_vma) 0,
1997 sgot->contents + (h->got.offset & ~1));
1998 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
2002 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2003 ((Elf32_External_Rela *) srela->contents
2004 + srela->reloc_count));
2005 ++srela->reloc_count;
2008 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2011 Elf_Internal_Rela rela;
2013 /* This symbol needs a copy reloc. Set it up. */
2015 BFD_ASSERT (h->dynindx != -1
2016 && (h->root.type == bfd_link_hash_defined
2017 || h->root.type == bfd_link_hash_defweak));
2019 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2021 BFD_ASSERT (s != NULL);
2023 rela.r_offset = (h->root.u.def.value
2024 + h->root.u.def.section->output_section->vma
2025 + h->root.u.def.section->output_offset);
2026 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
2028 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2029 ((Elf32_External_Rela *) s->contents
2034 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2035 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2036 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2037 sym->st_shndx = SHN_ABS;
2042 /* Finish up the dynamic sections. */
2045 elf_m68k_finish_dynamic_sections (output_bfd, info)
2047 struct bfd_link_info *info;
2053 dynobj = elf_hash_table (info)->dynobj;
2055 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2056 BFD_ASSERT (sgot != NULL);
2057 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2059 if (elf_hash_table (info)->dynamic_sections_created)
2062 Elf32_External_Dyn *dyncon, *dynconend;
2064 splt = bfd_get_section_by_name (dynobj, ".plt");
2065 BFD_ASSERT (splt != NULL && sdyn != NULL);
2067 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2068 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2069 for (; dyncon < dynconend; dyncon++)
2071 Elf_Internal_Dyn dyn;
2075 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2088 s = bfd_get_section_by_name (output_bfd, name);
2089 BFD_ASSERT (s != NULL);
2090 dyn.d_un.d_ptr = s->vma;
2091 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2095 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2096 BFD_ASSERT (s != NULL);
2097 if (s->_cooked_size != 0)
2098 dyn.d_un.d_val = s->_cooked_size;
2100 dyn.d_un.d_val = s->_raw_size;
2101 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2105 /* The procedure linkage table relocs (DT_JMPREL) should
2106 not be included in the overall relocs (DT_RELA).
2107 Therefore, we override the DT_RELASZ entry here to
2108 make it not include the JMPREL relocs. Since the
2109 linker script arranges for .rela.plt to follow all
2110 other relocation sections, we don't have to worry
2111 about changing the DT_RELA entry. */
2112 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2115 if (s->_cooked_size != 0)
2116 dyn.d_un.d_val -= s->_cooked_size;
2118 dyn.d_un.d_val -= s->_raw_size;
2120 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2125 /* Fill in the first entry in the procedure linkage table. */
2126 if (splt->_raw_size > 0)
2128 if (!CPU32_FLAG (output_bfd))
2130 memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
2131 bfd_put_32 (output_bfd,
2132 (sgot->output_section->vma
2133 + sgot->output_offset + 4
2134 - (splt->output_section->vma + 2)),
2135 splt->contents + 4);
2136 bfd_put_32 (output_bfd,
2137 (sgot->output_section->vma
2138 + sgot->output_offset + 8
2139 - (splt->output_section->vma + 10)),
2140 splt->contents + 12);
2141 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2146 memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE);
2147 bfd_put_32 (output_bfd,
2148 (sgot->output_section->vma
2149 + sgot->output_offset + 4
2150 - (splt->output_section->vma + 2)),
2151 splt->contents + 4);
2152 bfd_put_32 (output_bfd,
2153 (sgot->output_section->vma
2154 + sgot->output_offset + 8
2155 - (splt->output_section->vma + 10)),
2156 splt->contents + 12);
2157 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2158 = PLT_CPU32_ENTRY_SIZE;
2163 /* Fill in the first three entries in the global offset table. */
2164 if (sgot->_raw_size > 0)
2167 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2169 bfd_put_32 (output_bfd,
2170 sdyn->output_section->vma + sdyn->output_offset,
2172 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2173 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2176 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2181 /* Given a .data section and a .emreloc in-memory section, store
2182 relocation information into the .emreloc section which can be
2183 used at runtime to relocate the section. This is called by the
2184 linker when the --embedded-relocs switch is used. This is called
2185 after the add_symbols entry point has been called for all the
2186 objects, and before the final_link entry point is called. */
2189 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2191 struct bfd_link_info *info;
2196 Elf_Internal_Shdr *symtab_hdr;
2197 Elf32_External_Sym *extsyms;
2198 Elf32_External_Sym *free_extsyms = NULL;
2199 Elf_Internal_Rela *internal_relocs;
2200 Elf_Internal_Rela *free_relocs = NULL;
2201 Elf_Internal_Rela *irel, *irelend;
2204 BFD_ASSERT (! info->relocateable);
2208 if (datasec->reloc_count == 0)
2211 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2212 /* Read this BFD's symbols if we haven't done so already, or get the cached
2213 copy if it exists. */
2214 if (symtab_hdr->contents != NULL)
2215 extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
2218 /* Go get them off disk. */
2219 if (info->keep_memory)
2220 extsyms = ((Elf32_External_Sym *)
2221 bfd_alloc (abfd, symtab_hdr->sh_size));
2223 extsyms = ((Elf32_External_Sym *)
2224 bfd_malloc (symtab_hdr->sh_size));
2225 if (extsyms == NULL)
2227 if (! info->keep_memory)
2228 free_extsyms = extsyms;
2229 if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
2230 || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd)
2231 != symtab_hdr->sh_size))
2233 if (info->keep_memory)
2234 symtab_hdr->contents = extsyms;
2237 /* Get a copy of the native relocations. */
2238 internal_relocs = (_bfd_elf32_link_read_relocs
2239 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
2240 info->keep_memory));
2241 if (internal_relocs == NULL)
2243 if (! info->keep_memory)
2244 free_relocs = internal_relocs;
2246 relsec->contents = (bfd_byte *) bfd_alloc (abfd, datasec->reloc_count * 12);
2247 if (relsec->contents == NULL)
2250 p = relsec->contents;
2252 irelend = internal_relocs + datasec->reloc_count;
2253 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
2255 asection *targetsec;
2257 /* We are going to write a four byte longword into the runtime
2258 reloc section. The longword will be the address in the data
2259 section which must be relocated. It is followed by the name
2260 of the target section NUL-padded or truncated to 8
2263 /* We can only relocate absolute longword relocs at run time. */
2264 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
2266 *errmsg = _("unsupported reloc type");
2267 bfd_set_error (bfd_error_bad_value);
2271 /* Get the target section referred to by the reloc. */
2272 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
2274 Elf_Internal_Sym isym;
2276 /* A local symbol. */
2277 bfd_elf32_swap_symbol_in (abfd,
2278 extsyms + ELF32_R_SYM (irel->r_info),
2281 targetsec = bfd_section_from_elf_index (abfd, isym.st_shndx);
2286 struct elf_link_hash_entry *h;
2288 /* An external symbol. */
2289 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
2290 h = elf_sym_hashes (abfd)[indx];
2291 BFD_ASSERT (h != NULL);
2292 if (h->root.type == bfd_link_hash_defined
2293 || h->root.type == bfd_link_hash_defweak)
2294 targetsec = h->root.u.def.section;
2299 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
2300 memset (p + 4, 0, 8);
2301 if (targetsec != NULL)
2302 strncpy (p + 4, targetsec->output_section->name, 8);
2305 if (free_extsyms != NULL)
2306 free (free_extsyms);
2307 if (free_relocs != NULL)
2312 if (free_extsyms != NULL)
2313 free (free_extsyms);
2314 if (free_relocs != NULL)
2319 #define TARGET_BIG_SYM bfd_elf32_m68k_vec
2320 #define TARGET_BIG_NAME "elf32-m68k"
2321 #define ELF_MACHINE_CODE EM_68K
2322 #define ELF_MAXPAGESIZE 0x2000
2323 #define elf_backend_create_dynamic_sections \
2324 _bfd_elf_create_dynamic_sections
2325 #define bfd_elf32_bfd_link_hash_table_create \
2326 elf_m68k_link_hash_table_create
2327 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2329 #define elf_backend_check_relocs elf_m68k_check_relocs
2330 #define elf_backend_adjust_dynamic_symbol \
2331 elf_m68k_adjust_dynamic_symbol
2332 #define elf_backend_size_dynamic_sections \
2333 elf_m68k_size_dynamic_sections
2334 #define elf_backend_relocate_section elf_m68k_relocate_section
2335 #define elf_backend_finish_dynamic_symbol \
2336 elf_m68k_finish_dynamic_symbol
2337 #define elf_backend_finish_dynamic_sections \
2338 elf_m68k_finish_dynamic_sections
2339 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
2340 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook
2341 #define bfd_elf32_bfd_copy_private_bfd_data \
2342 elf32_m68k_copy_private_bfd_data
2343 #define bfd_elf32_bfd_merge_private_bfd_data \
2344 elf32_m68k_merge_private_bfd_data
2345 #define bfd_elf32_bfd_set_private_flags \
2346 elf32_m68k_set_private_flags
2347 #define bfd_elf32_bfd_print_private_bfd_data \
2348 elf32_m68k_print_private_bfd_data
2350 #define elf_backend_can_gc_sections 1
2351 #define elf_backend_want_got_plt 1
2352 #define elf_backend_plt_readonly 1
2353 #define elf_backend_want_plt_sym 0
2354 #define elf_backend_got_header_size 12
2356 #include "elf32-target.h"