| 1 | /* Motorola 68k series support for 32-bit ELF |
| 2 | Copyright 1993, 1995, 1996, 1997, 1998 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of BFD, the Binary File Descriptor library. |
| 5 | |
| 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. |
| 10 | |
| 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. |
| 15 | |
| 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. */ |
| 19 | |
| 20 | #include "bfd.h" |
| 21 | #include "sysdep.h" |
| 22 | #include "bfdlink.h" |
| 23 | #include "libbfd.h" |
| 24 | #include "elf-bfd.h" |
| 25 | |
| 26 | static reloc_howto_type *reloc_type_lookup |
| 27 | PARAMS ((bfd *, bfd_reloc_code_real_type)); |
| 28 | static void rtype_to_howto |
| 29 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); |
| 30 | static void rtype_to_howto_rel |
| 31 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); |
| 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 |
| 35 | PARAMS ((bfd *)); |
| 36 | static boolean elf_m68k_check_relocs |
| 37 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 38 | const Elf_Internal_Rela *)); |
| 39 | static boolean elf_m68k_adjust_dynamic_symbol |
| 40 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 41 | static boolean elf_m68k_adjust_dynindx |
| 42 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
| 43 | static boolean elf_m68k_size_dynamic_sections |
| 44 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 45 | static boolean elf_m68k_relocate_section |
| 46 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 47 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 48 | static boolean elf_m68k_finish_dynamic_symbol |
| 49 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, |
| 50 | Elf_Internal_Sym *)); |
| 51 | static boolean elf_m68k_finish_dynamic_sections |
| 52 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 53 | |
| 54 | /* elf32 m68k code, generated by elf.el */ |
| 55 | enum reloc_type { |
| 56 | R_68K_NONE = 0, |
| 57 | R_68K_32 = 1, |
| 58 | R_68K_16 = 2, |
| 59 | R_68K_8 = 3, |
| 60 | R_68K_PC32 = 4, |
| 61 | R_68K_PC16 = 5, |
| 62 | R_68K_PC8 = 6, |
| 63 | R_68K_GOT32 = 7, |
| 64 | R_68K_GOT16 = 8, |
| 65 | R_68K_GOT8 = 9, |
| 66 | R_68K_GOT32O = 10, |
| 67 | R_68K_GOT16O = 11, |
| 68 | R_68K_GOT8O = 12, |
| 69 | R_68K_PLT32 = 13, |
| 70 | R_68K_PLT16 = 14, |
| 71 | R_68K_PLT8 = 15, |
| 72 | R_68K_PLT32O = 16, |
| 73 | R_68K_PLT16O = 17, |
| 74 | R_68K_PLT8O = 18, |
| 75 | R_68K_COPY = 19, |
| 76 | R_68K_GLOB_DAT = 20, |
| 77 | R_68K_JMP_SLOT = 21, |
| 78 | R_68K_RELATIVE = 22, |
| 79 | R_68K__max |
| 80 | }; |
| 81 | |
| 82 | static reloc_howto_type howto_table[] = { |
| 83 | HOWTO(R_68K_NONE, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", false, 0, 0x00000000,false), |
| 84 | HOWTO(R_68K_32, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0, 0xffffffff,false), |
| 85 | HOWTO(R_68K_16, 0, 1,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0, 0x0000ffff,false), |
| 86 | HOWTO(R_68K_8, 0, 0, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0, 0x000000ff,false), |
| 87 | HOWTO(R_68K_PC32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", false, 0, 0xffffffff,true), |
| 88 | HOWTO(R_68K_PC16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0, 0x0000ffff,true), |
| 89 | HOWTO(R_68K_PC8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0, 0x000000ff,true), |
| 90 | HOWTO(R_68K_GOT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0, 0xffffffff,true), |
| 91 | HOWTO(R_68K_GOT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0, 0x0000ffff,true), |
| 92 | HOWTO(R_68K_GOT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0, 0x000000ff,true), |
| 93 | HOWTO(R_68K_GOT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0, 0xffffffff,false), |
| 94 | HOWTO(R_68K_GOT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0, 0x0000ffff,false), |
| 95 | HOWTO(R_68K_GOT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0, 0x000000ff,false), |
| 96 | HOWTO(R_68K_PLT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0, 0xffffffff,true), |
| 97 | HOWTO(R_68K_PLT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0, 0x0000ffff,true), |
| 98 | HOWTO(R_68K_PLT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0, 0x000000ff,true), |
| 99 | HOWTO(R_68K_PLT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0, 0xffffffff,false), |
| 100 | HOWTO(R_68K_PLT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0, 0x0000ffff,false), |
| 101 | HOWTO(R_68K_PLT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", false, 0, 0x000000ff,false), |
| 102 | HOWTO(R_68K_COPY, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", false, 0, 0xffffffff,false), |
| 103 | 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), |
| 104 | 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), |
| 105 | HOWTO(R_68K_RELATIVE, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", false, 0, 0xffffffff,false), |
| 106 | }; |
| 107 | |
| 108 | static void |
| 109 | rtype_to_howto (abfd, cache_ptr, dst) |
| 110 | bfd *abfd; |
| 111 | arelent *cache_ptr; |
| 112 | Elf_Internal_Rela *dst; |
| 113 | { |
| 114 | BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K__max); |
| 115 | cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)]; |
| 116 | } |
| 117 | |
| 118 | static void |
| 119 | rtype_to_howto_rel (abfd, cache_ptr, dst) |
| 120 | bfd *abfd; |
| 121 | arelent *cache_ptr; |
| 122 | Elf_Internal_Rel *dst; |
| 123 | { |
| 124 | BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K__max); |
| 125 | cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)]; |
| 126 | } |
| 127 | |
| 128 | #define elf_info_to_howto rtype_to_howto |
| 129 | #define elf_info_to_howto_rel rtype_to_howto_rel |
| 130 | |
| 131 | static const struct { unsigned char bfd_val, elf_val; } reloc_map[] = { |
| 132 | { BFD_RELOC_NONE, R_68K_NONE }, |
| 133 | { BFD_RELOC_32, R_68K_32 }, |
| 134 | { BFD_RELOC_16, R_68K_16 }, |
| 135 | { BFD_RELOC_8, R_68K_8 }, |
| 136 | { BFD_RELOC_32_PCREL, R_68K_PC32 }, |
| 137 | { BFD_RELOC_16_PCREL, R_68K_PC16 }, |
| 138 | { BFD_RELOC_8_PCREL, R_68K_PC8 }, |
| 139 | { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, |
| 140 | { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, |
| 141 | { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, |
| 142 | { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, |
| 143 | { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, |
| 144 | { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, |
| 145 | { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, |
| 146 | { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, |
| 147 | { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, |
| 148 | { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, |
| 149 | { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, |
| 150 | { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, |
| 151 | { BFD_RELOC_NONE, R_68K_COPY }, |
| 152 | { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, |
| 153 | { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, |
| 154 | { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, |
| 155 | { BFD_RELOC_CTOR, R_68K_32 }, |
| 156 | }; |
| 157 | |
| 158 | static reloc_howto_type * |
| 159 | reloc_type_lookup (abfd, code) |
| 160 | bfd *abfd; |
| 161 | bfd_reloc_code_real_type code; |
| 162 | { |
| 163 | unsigned int i; |
| 164 | for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) |
| 165 | { |
| 166 | if (reloc_map[i].bfd_val == code) |
| 167 | return &howto_table[(int) reloc_map[i].elf_val]; |
| 168 | } |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup |
| 173 | #define ELF_ARCH bfd_arch_m68k |
| 174 | /* end code generated by elf.el */ |
| 175 | |
| 176 | #define USE_RELA |
| 177 | |
| 178 | \f |
| 179 | /* Functions for the m68k ELF linker. */ |
| 180 | |
| 181 | /* The name of the dynamic interpreter. This is put in the .interp |
| 182 | section. */ |
| 183 | |
| 184 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" |
| 185 | |
| 186 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 187 | |
| 188 | #define PLT_ENTRY_SIZE 20 |
| 189 | |
| 190 | /* The first entry in a procedure linkage table looks like this. See |
| 191 | the SVR4 ABI m68k supplement to see how this works. */ |
| 192 | |
| 193 | static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = |
| 194 | { |
| 195 | 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ |
| 196 | 0, 0, 0, 0, /* replaced with offset to .got + 4. */ |
| 197 | 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ |
| 198 | 0, 0, 0, 0, /* replaced with offset to .got + 8. */ |
| 199 | 0, 0, 0, 0 /* pad out to 20 bytes. */ |
| 200 | }; |
| 201 | |
| 202 | /* Subsequent entries in a procedure linkage table look like this. */ |
| 203 | |
| 204 | static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = |
| 205 | { |
| 206 | 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */ |
| 207 | 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */ |
| 208 | 0x2f, 0x3c, /* move.l #offset,-(%sp) */ |
| 209 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 210 | 0x60, 0xff, /* bra.l .plt */ |
| 211 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 212 | }; |
| 213 | |
| 214 | /* The m68k linker needs to keep track of the number of relocs that it |
| 215 | decides to copy in check_relocs for each symbol. This is so that it |
| 216 | can discard PC relative relocs if it doesn't need them when linking |
| 217 | with -Bsymbolic. We store the information in a field extending the |
| 218 | regular ELF linker hash table. */ |
| 219 | |
| 220 | /* This structure keeps track of the number of PC relative relocs we have |
| 221 | copied for a given symbol. */ |
| 222 | |
| 223 | struct elf_m68k_pcrel_relocs_copied |
| 224 | { |
| 225 | /* Next section. */ |
| 226 | struct elf_m68k_pcrel_relocs_copied *next; |
| 227 | /* A section in dynobj. */ |
| 228 | asection *section; |
| 229 | /* Number of relocs copied in this section. */ |
| 230 | bfd_size_type count; |
| 231 | }; |
| 232 | |
| 233 | /* m68k ELF linker hash entry. */ |
| 234 | |
| 235 | struct elf_m68k_link_hash_entry |
| 236 | { |
| 237 | struct elf_link_hash_entry root; |
| 238 | |
| 239 | /* Number of PC relative relocs copied for this symbol. */ |
| 240 | struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied; |
| 241 | }; |
| 242 | |
| 243 | /* m68k ELF linker hash table. */ |
| 244 | |
| 245 | struct elf_m68k_link_hash_table |
| 246 | { |
| 247 | struct elf_link_hash_table root; |
| 248 | }; |
| 249 | |
| 250 | /* Declare this now that the above structures are defined. */ |
| 251 | |
| 252 | static boolean elf_m68k_discard_copies |
| 253 | PARAMS ((struct elf_m68k_link_hash_entry *, PTR)); |
| 254 | |
| 255 | /* Traverse an m68k ELF linker hash table. */ |
| 256 | |
| 257 | #define elf_m68k_link_hash_traverse(table, func, info) \ |
| 258 | (elf_link_hash_traverse \ |
| 259 | (&(table)->root, \ |
| 260 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ |
| 261 | (info))) |
| 262 | |
| 263 | /* Get the m68k ELF linker hash table from a link_info structure. */ |
| 264 | |
| 265 | #define elf_m68k_hash_table(p) \ |
| 266 | ((struct elf_m68k_link_hash_table *) (p)->hash) |
| 267 | |
| 268 | /* Create an entry in an m68k ELF linker hash table. */ |
| 269 | |
| 270 | static struct bfd_hash_entry * |
| 271 | elf_m68k_link_hash_newfunc (entry, table, string) |
| 272 | struct bfd_hash_entry *entry; |
| 273 | struct bfd_hash_table *table; |
| 274 | const char *string; |
| 275 | { |
| 276 | struct elf_m68k_link_hash_entry *ret = |
| 277 | (struct elf_m68k_link_hash_entry *) entry; |
| 278 | |
| 279 | /* Allocate the structure if it has not already been allocated by a |
| 280 | subclass. */ |
| 281 | if (ret == (struct elf_m68k_link_hash_entry *) NULL) |
| 282 | ret = ((struct elf_m68k_link_hash_entry *) |
| 283 | bfd_hash_allocate (table, |
| 284 | sizeof (struct elf_m68k_link_hash_entry))); |
| 285 | if (ret == (struct elf_m68k_link_hash_entry *) NULL) |
| 286 | return (struct bfd_hash_entry *) ret; |
| 287 | |
| 288 | /* Call the allocation method of the superclass. */ |
| 289 | ret = ((struct elf_m68k_link_hash_entry *) |
| 290 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, |
| 291 | table, string)); |
| 292 | if (ret != (struct elf_m68k_link_hash_entry *) NULL) |
| 293 | { |
| 294 | ret->pcrel_relocs_copied = NULL; |
| 295 | } |
| 296 | |
| 297 | return (struct bfd_hash_entry *) ret; |
| 298 | } |
| 299 | |
| 300 | /* Create an m68k ELF linker hash table. */ |
| 301 | |
| 302 | static struct bfd_link_hash_table * |
| 303 | elf_m68k_link_hash_table_create (abfd) |
| 304 | bfd *abfd; |
| 305 | { |
| 306 | struct elf_m68k_link_hash_table *ret; |
| 307 | |
| 308 | ret = ((struct elf_m68k_link_hash_table *) |
| 309 | bfd_alloc (abfd, sizeof (struct elf_m68k_link_hash_table))); |
| 310 | if (ret == (struct elf_m68k_link_hash_table *) NULL) |
| 311 | return NULL; |
| 312 | |
| 313 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, |
| 314 | elf_m68k_link_hash_newfunc)) |
| 315 | { |
| 316 | bfd_release (abfd, ret); |
| 317 | return NULL; |
| 318 | } |
| 319 | |
| 320 | return &ret->root.root; |
| 321 | } |
| 322 | |
| 323 | /* Look through the relocs for a section during the first phase, and |
| 324 | allocate space in the global offset table or procedure linkage |
| 325 | table. */ |
| 326 | |
| 327 | static boolean |
| 328 | elf_m68k_check_relocs (abfd, info, sec, relocs) |
| 329 | bfd *abfd; |
| 330 | struct bfd_link_info *info; |
| 331 | asection *sec; |
| 332 | const Elf_Internal_Rela *relocs; |
| 333 | { |
| 334 | bfd *dynobj; |
| 335 | Elf_Internal_Shdr *symtab_hdr; |
| 336 | struct elf_link_hash_entry **sym_hashes; |
| 337 | bfd_vma *local_got_offsets; |
| 338 | const Elf_Internal_Rela *rel; |
| 339 | const Elf_Internal_Rela *rel_end; |
| 340 | asection *sgot; |
| 341 | asection *srelgot; |
| 342 | asection *sreloc; |
| 343 | |
| 344 | if (info->relocateable) |
| 345 | return true; |
| 346 | |
| 347 | dynobj = elf_hash_table (info)->dynobj; |
| 348 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 349 | sym_hashes = elf_sym_hashes (abfd); |
| 350 | local_got_offsets = elf_local_got_offsets (abfd); |
| 351 | |
| 352 | sgot = NULL; |
| 353 | srelgot = NULL; |
| 354 | sreloc = NULL; |
| 355 | |
| 356 | rel_end = relocs + sec->reloc_count; |
| 357 | for (rel = relocs; rel < rel_end; rel++) |
| 358 | { |
| 359 | unsigned long r_symndx; |
| 360 | struct elf_link_hash_entry *h; |
| 361 | |
| 362 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 363 | |
| 364 | if (r_symndx < symtab_hdr->sh_info) |
| 365 | h = NULL; |
| 366 | else |
| 367 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 368 | |
| 369 | switch (ELF32_R_TYPE (rel->r_info)) |
| 370 | { |
| 371 | case R_68K_GOT8: |
| 372 | case R_68K_GOT16: |
| 373 | case R_68K_GOT32: |
| 374 | if (h != NULL |
| 375 | && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 376 | break; |
| 377 | /* Fall through. */ |
| 378 | case R_68K_GOT8O: |
| 379 | case R_68K_GOT16O: |
| 380 | case R_68K_GOT32O: |
| 381 | /* This symbol requires a global offset table entry. */ |
| 382 | |
| 383 | if (dynobj == NULL) |
| 384 | { |
| 385 | /* Create the .got section. */ |
| 386 | elf_hash_table (info)->dynobj = dynobj = abfd; |
| 387 | if (!_bfd_elf_create_got_section (dynobj, info)) |
| 388 | return false; |
| 389 | } |
| 390 | |
| 391 | if (sgot == NULL) |
| 392 | { |
| 393 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 394 | BFD_ASSERT (sgot != NULL); |
| 395 | } |
| 396 | |
| 397 | if (srelgot == NULL |
| 398 | && (h != NULL || info->shared)) |
| 399 | { |
| 400 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); |
| 401 | if (srelgot == NULL) |
| 402 | { |
| 403 | srelgot = bfd_make_section (dynobj, ".rela.got"); |
| 404 | if (srelgot == NULL |
| 405 | || !bfd_set_section_flags (dynobj, srelgot, |
| 406 | (SEC_ALLOC |
| 407 | | SEC_LOAD |
| 408 | | SEC_HAS_CONTENTS |
| 409 | | SEC_IN_MEMORY |
| 410 | | SEC_LINKER_CREATED |
| 411 | | SEC_READONLY)) |
| 412 | || !bfd_set_section_alignment (dynobj, srelgot, 2)) |
| 413 | return false; |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | if (h != NULL) |
| 418 | { |
| 419 | if (h->got.offset != (bfd_vma) -1) |
| 420 | { |
| 421 | /* We have already allocated space in the .got. */ |
| 422 | break; |
| 423 | } |
| 424 | h->got.offset = sgot->_raw_size; |
| 425 | |
| 426 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 427 | if (h->dynindx == -1) |
| 428 | { |
| 429 | if (!bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 430 | return false; |
| 431 | } |
| 432 | |
| 433 | srelgot->_raw_size += sizeof (Elf32_External_Rela); |
| 434 | } |
| 435 | else |
| 436 | { |
| 437 | /* This is a global offset table entry for a local |
| 438 | symbol. */ |
| 439 | if (local_got_offsets == NULL) |
| 440 | { |
| 441 | size_t size; |
| 442 | register unsigned int i; |
| 443 | |
| 444 | size = symtab_hdr->sh_info * sizeof (bfd_vma); |
| 445 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); |
| 446 | if (local_got_offsets == NULL) |
| 447 | return false; |
| 448 | elf_local_got_offsets (abfd) = local_got_offsets; |
| 449 | for (i = 0; i < symtab_hdr->sh_info; i++) |
| 450 | local_got_offsets[i] = (bfd_vma) -1; |
| 451 | } |
| 452 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) |
| 453 | { |
| 454 | /* We have already allocated space in the .got. */ |
| 455 | break; |
| 456 | } |
| 457 | local_got_offsets[r_symndx] = sgot->_raw_size; |
| 458 | |
| 459 | if (info->shared) |
| 460 | { |
| 461 | /* If we are generating a shared object, we need to |
| 462 | output a R_68K_RELATIVE reloc so that the dynamic |
| 463 | linker can adjust this GOT entry. */ |
| 464 | srelgot->_raw_size += sizeof (Elf32_External_Rela); |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | sgot->_raw_size += 4; |
| 469 | break; |
| 470 | |
| 471 | case R_68K_PLT8: |
| 472 | case R_68K_PLT16: |
| 473 | case R_68K_PLT32: |
| 474 | /* This symbol requires a procedure linkage table entry. We |
| 475 | actually build the entry in adjust_dynamic_symbol, |
| 476 | because this might be a case of linking PIC code which is |
| 477 | never referenced by a dynamic object, in which case we |
| 478 | don't need to generate a procedure linkage table entry |
| 479 | after all. */ |
| 480 | |
| 481 | /* If this is a local symbol, we resolve it directly without |
| 482 | creating a procedure linkage table entry. */ |
| 483 | if (h == NULL) |
| 484 | continue; |
| 485 | |
| 486 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| 487 | break; |
| 488 | |
| 489 | case R_68K_PLT8O: |
| 490 | case R_68K_PLT16O: |
| 491 | case R_68K_PLT32O: |
| 492 | /* This symbol requires a procedure linkage table entry. */ |
| 493 | |
| 494 | if (h == NULL) |
| 495 | { |
| 496 | /* It does not make sense to have this relocation for a |
| 497 | local symbol. FIXME: does it? How to handle it if |
| 498 | it does make sense? */ |
| 499 | bfd_set_error (bfd_error_bad_value); |
| 500 | return false; |
| 501 | } |
| 502 | |
| 503 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 504 | if (h->dynindx == -1) |
| 505 | { |
| 506 | if (!bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 507 | return false; |
| 508 | } |
| 509 | |
| 510 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| 511 | break; |
| 512 | |
| 513 | case R_68K_PC8: |
| 514 | case R_68K_PC16: |
| 515 | case R_68K_PC32: |
| 516 | /* If we are creating a shared library and this is not a local |
| 517 | symbol, we need to copy the reloc into the shared library. |
| 518 | However when linking with -Bsymbolic and this is a global |
| 519 | symbol which is defined in an object we are including in the |
| 520 | link (i.e., DEF_REGULAR is set), then we can resolve the |
| 521 | reloc directly. At this point we have not seen all the input |
| 522 | files, so it is possible that DEF_REGULAR is not set now but |
| 523 | will be set later (it is never cleared). We account for that |
| 524 | possibility below by storing information in the |
| 525 | pcrel_relocs_copied field of the hash table entry. */ |
| 526 | if (!(info->shared |
| 527 | && (sec->flags & SEC_ALLOC) != 0 |
| 528 | && h != NULL |
| 529 | && (!info->symbolic |
| 530 | || (h->elf_link_hash_flags |
| 531 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) |
| 532 | break; |
| 533 | /* Fall through. */ |
| 534 | case R_68K_8: |
| 535 | case R_68K_16: |
| 536 | case R_68K_32: |
| 537 | /* If we are creating a shared library, we need to copy the |
| 538 | reloc into the shared library. */ |
| 539 | if (info->shared |
| 540 | && (sec->flags & SEC_ALLOC) != 0) |
| 541 | { |
| 542 | /* When creating a shared object, we must copy these |
| 543 | reloc types into the output file. We create a reloc |
| 544 | section in dynobj and make room for this reloc. */ |
| 545 | if (sreloc == NULL) |
| 546 | { |
| 547 | const char *name; |
| 548 | |
| 549 | name = (bfd_elf_string_from_elf_section |
| 550 | (abfd, |
| 551 | elf_elfheader (abfd)->e_shstrndx, |
| 552 | elf_section_data (sec)->rel_hdr.sh_name)); |
| 553 | if (name == NULL) |
| 554 | return false; |
| 555 | |
| 556 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 |
| 557 | && strcmp (bfd_get_section_name (abfd, sec), |
| 558 | name + 5) == 0); |
| 559 | |
| 560 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 561 | if (sreloc == NULL) |
| 562 | { |
| 563 | sreloc = bfd_make_section (dynobj, name); |
| 564 | if (sreloc == NULL |
| 565 | || !bfd_set_section_flags (dynobj, sreloc, |
| 566 | (SEC_ALLOC |
| 567 | | SEC_LOAD |
| 568 | | SEC_HAS_CONTENTS |
| 569 | | SEC_IN_MEMORY |
| 570 | | SEC_LINKER_CREATED |
| 571 | | SEC_READONLY)) |
| 572 | || !bfd_set_section_alignment (dynobj, sreloc, 2)) |
| 573 | return false; |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | sreloc->_raw_size += sizeof (Elf32_External_Rela); |
| 578 | |
| 579 | /* If we are linking with -Bsymbolic, we count the number of |
| 580 | PC relative relocations we have entered for this symbol, |
| 581 | so that we can discard them again if the symbol is later |
| 582 | defined by a regular object. Note that this function is |
| 583 | only called if we are using an m68kelf linker hash table, |
| 584 | which means that h is really a pointer to an |
| 585 | elf_m68k_link_hash_entry. */ |
| 586 | if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8 |
| 587 | || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 |
| 588 | || ELF32_R_TYPE (rel->r_info) == R_68K_PC32) |
| 589 | && info->symbolic) |
| 590 | { |
| 591 | struct elf_m68k_link_hash_entry *eh; |
| 592 | struct elf_m68k_pcrel_relocs_copied *p; |
| 593 | |
| 594 | eh = (struct elf_m68k_link_hash_entry *) h; |
| 595 | |
| 596 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) |
| 597 | if (p->section == sreloc) |
| 598 | break; |
| 599 | |
| 600 | if (p == NULL) |
| 601 | { |
| 602 | p = ((struct elf_m68k_pcrel_relocs_copied *) |
| 603 | bfd_alloc (dynobj, sizeof *p)); |
| 604 | if (p == NULL) |
| 605 | return false; |
| 606 | p->next = eh->pcrel_relocs_copied; |
| 607 | eh->pcrel_relocs_copied = p; |
| 608 | p->section = sreloc; |
| 609 | p->count = 0; |
| 610 | } |
| 611 | |
| 612 | ++p->count; |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | break; |
| 617 | |
| 618 | default: |
| 619 | break; |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | return true; |
| 624 | } |
| 625 | |
| 626 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 627 | regular object. The current definition is in some section of the |
| 628 | dynamic object, but we're not including those sections. We have to |
| 629 | change the definition to something the rest of the link can |
| 630 | understand. */ |
| 631 | |
| 632 | static boolean |
| 633 | elf_m68k_adjust_dynamic_symbol (info, h) |
| 634 | struct bfd_link_info *info; |
| 635 | struct elf_link_hash_entry *h; |
| 636 | { |
| 637 | bfd *dynobj; |
| 638 | asection *s; |
| 639 | unsigned int power_of_two; |
| 640 | |
| 641 | dynobj = elf_hash_table (info)->dynobj; |
| 642 | |
| 643 | /* Make sure we know what is going on here. */ |
| 644 | BFD_ASSERT (dynobj != NULL |
| 645 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) |
| 646 | || h->weakdef != NULL |
| 647 | || ((h->elf_link_hash_flags |
| 648 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 649 | && (h->elf_link_hash_flags |
| 650 | & ELF_LINK_HASH_REF_REGULAR) != 0 |
| 651 | && (h->elf_link_hash_flags |
| 652 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); |
| 653 | |
| 654 | /* If this is a function, put it in the procedure linkage table. We |
| 655 | will fill in the contents of the procedure linkage table later, |
| 656 | when we know the address of the .got section. */ |
| 657 | if (h->type == STT_FUNC |
| 658 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) |
| 659 | { |
| 660 | if (! info->shared |
| 661 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 |
| 662 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 |
| 663 | /* We must always create the plt entry if it was referenced |
| 664 | by a PLTxxO relocation. In this case we already recorded |
| 665 | it as a dynamic symbol. */ |
| 666 | && h->dynindx == -1) |
| 667 | { |
| 668 | /* This case can occur if we saw a PLTxx reloc in an input |
| 669 | file, but the symbol was never referred to by a dynamic |
| 670 | object. In such a case, we don't actually need to build |
| 671 | a procedure linkage table, and we can just do a PCxx |
| 672 | reloc instead. */ |
| 673 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); |
| 674 | return true; |
| 675 | } |
| 676 | |
| 677 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 678 | if (h->dynindx == -1) |
| 679 | { |
| 680 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 681 | return false; |
| 682 | } |
| 683 | |
| 684 | s = bfd_get_section_by_name (dynobj, ".plt"); |
| 685 | BFD_ASSERT (s != NULL); |
| 686 | |
| 687 | /* If this is the first .plt entry, make room for the special |
| 688 | first entry. */ |
| 689 | if (s->_raw_size == 0) |
| 690 | s->_raw_size += PLT_ENTRY_SIZE; |
| 691 | |
| 692 | /* If this symbol is not defined in a regular file, and we are |
| 693 | not generating a shared library, then set the symbol to this |
| 694 | location in the .plt. This is required to make function |
| 695 | pointers compare as equal between the normal executable and |
| 696 | the shared library. */ |
| 697 | if (!info->shared |
| 698 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 699 | { |
| 700 | h->root.u.def.section = s; |
| 701 | h->root.u.def.value = s->_raw_size; |
| 702 | } |
| 703 | |
| 704 | h->plt.offset = s->_raw_size; |
| 705 | |
| 706 | /* Make room for this entry. */ |
| 707 | s->_raw_size += PLT_ENTRY_SIZE; |
| 708 | |
| 709 | /* We also need to make an entry in the .got.plt section, which |
| 710 | will be placed in the .got section by the linker script. */ |
| 711 | |
| 712 | s = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 713 | BFD_ASSERT (s != NULL); |
| 714 | s->_raw_size += 4; |
| 715 | |
| 716 | /* We also need to make an entry in the .rela.plt section. */ |
| 717 | |
| 718 | s = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| 719 | BFD_ASSERT (s != NULL); |
| 720 | s->_raw_size += sizeof (Elf32_External_Rela); |
| 721 | |
| 722 | return true; |
| 723 | } |
| 724 | |
| 725 | /* If this is a weak symbol, and there is a real definition, the |
| 726 | processor independent code will have arranged for us to see the |
| 727 | real definition first, and we can just use the same value. */ |
| 728 | if (h->weakdef != NULL) |
| 729 | { |
| 730 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| 731 | || h->weakdef->root.type == bfd_link_hash_defweak); |
| 732 | h->root.u.def.section = h->weakdef->root.u.def.section; |
| 733 | h->root.u.def.value = h->weakdef->root.u.def.value; |
| 734 | return true; |
| 735 | } |
| 736 | |
| 737 | /* This is a reference to a symbol defined by a dynamic object which |
| 738 | is not a function. */ |
| 739 | |
| 740 | /* If we are creating a shared library, we must presume that the |
| 741 | only references to the symbol are via the global offset table. |
| 742 | For such cases we need not do anything here; the relocations will |
| 743 | be handled correctly by relocate_section. */ |
| 744 | if (info->shared) |
| 745 | return true; |
| 746 | |
| 747 | /* We must allocate the symbol in our .dynbss section, which will |
| 748 | become part of the .bss section of the executable. There will be |
| 749 | an entry for this symbol in the .dynsym section. The dynamic |
| 750 | object will contain position independent code, so all references |
| 751 | from the dynamic object to this symbol will go through the global |
| 752 | offset table. The dynamic linker will use the .dynsym entry to |
| 753 | determine the address it must put in the global offset table, so |
| 754 | both the dynamic object and the regular object will refer to the |
| 755 | same memory location for the variable. */ |
| 756 | |
| 757 | s = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 758 | BFD_ASSERT (s != NULL); |
| 759 | |
| 760 | /* We must generate a R_68K_COPY reloc to tell the dynamic linker to |
| 761 | copy the initial value out of the dynamic object and into the |
| 762 | runtime process image. We need to remember the offset into the |
| 763 | .rela.bss section we are going to use. */ |
| 764 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 765 | { |
| 766 | asection *srel; |
| 767 | |
| 768 | srel = bfd_get_section_by_name (dynobj, ".rela.bss"); |
| 769 | BFD_ASSERT (srel != NULL); |
| 770 | srel->_raw_size += sizeof (Elf32_External_Rela); |
| 771 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
| 772 | } |
| 773 | |
| 774 | /* We need to figure out the alignment required for this symbol. I |
| 775 | have no idea how ELF linkers handle this. */ |
| 776 | power_of_two = bfd_log2 (h->size); |
| 777 | if (power_of_two > 3) |
| 778 | power_of_two = 3; |
| 779 | |
| 780 | /* Apply the required alignment. */ |
| 781 | s->_raw_size = BFD_ALIGN (s->_raw_size, |
| 782 | (bfd_size_type) (1 << power_of_two)); |
| 783 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) |
| 784 | { |
| 785 | if (!bfd_set_section_alignment (dynobj, s, power_of_two)) |
| 786 | return false; |
| 787 | } |
| 788 | |
| 789 | /* Define the symbol as being at this point in the section. */ |
| 790 | h->root.u.def.section = s; |
| 791 | h->root.u.def.value = s->_raw_size; |
| 792 | |
| 793 | /* Increment the section size to make room for the symbol. */ |
| 794 | s->_raw_size += h->size; |
| 795 | |
| 796 | return true; |
| 797 | } |
| 798 | |
| 799 | /* Set the sizes of the dynamic sections. */ |
| 800 | |
| 801 | static boolean |
| 802 | elf_m68k_size_dynamic_sections (output_bfd, info) |
| 803 | bfd *output_bfd; |
| 804 | struct bfd_link_info *info; |
| 805 | { |
| 806 | bfd *dynobj; |
| 807 | asection *s; |
| 808 | boolean plt; |
| 809 | boolean relocs; |
| 810 | boolean reltext; |
| 811 | |
| 812 | dynobj = elf_hash_table (info)->dynobj; |
| 813 | BFD_ASSERT (dynobj != NULL); |
| 814 | |
| 815 | if (elf_hash_table (info)->dynamic_sections_created) |
| 816 | { |
| 817 | /* Set the contents of the .interp section to the interpreter. */ |
| 818 | if (!info->shared) |
| 819 | { |
| 820 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 821 | BFD_ASSERT (s != NULL); |
| 822 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 823 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 824 | } |
| 825 | } |
| 826 | else |
| 827 | { |
| 828 | /* We may have created entries in the .rela.got section. |
| 829 | However, if we are not creating the dynamic sections, we will |
| 830 | not actually use these entries. Reset the size of .rela.got, |
| 831 | which will cause it to get stripped from the output file |
| 832 | below. */ |
| 833 | s = bfd_get_section_by_name (dynobj, ".rela.got"); |
| 834 | if (s != NULL) |
| 835 | s->_raw_size = 0; |
| 836 | } |
| 837 | |
| 838 | /* If this is a -Bsymbolic shared link, then we need to discard all PC |
| 839 | relative relocs against symbols defined in a regular object. We |
| 840 | allocated space for them in the check_relocs routine, but we will not |
| 841 | fill them in in the relocate_section routine. */ |
| 842 | if (info->shared && info->symbolic) |
| 843 | elf_m68k_link_hash_traverse (elf_m68k_hash_table (info), |
| 844 | elf_m68k_discard_copies, |
| 845 | (PTR) NULL); |
| 846 | |
| 847 | /* The check_relocs and adjust_dynamic_symbol entry points have |
| 848 | determined the sizes of the various dynamic sections. Allocate |
| 849 | memory for them. */ |
| 850 | plt = false; |
| 851 | relocs = false; |
| 852 | reltext = false; |
| 853 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 854 | { |
| 855 | const char *name; |
| 856 | boolean strip; |
| 857 | |
| 858 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 859 | continue; |
| 860 | |
| 861 | /* It's OK to base decisions on the section name, because none |
| 862 | of the dynobj section names depend upon the input files. */ |
| 863 | name = bfd_get_section_name (dynobj, s); |
| 864 | |
| 865 | strip = false; |
| 866 | |
| 867 | if (strcmp (name, ".plt") == 0) |
| 868 | { |
| 869 | if (s->_raw_size == 0) |
| 870 | { |
| 871 | /* Strip this section if we don't need it; see the |
| 872 | comment below. */ |
| 873 | strip = true; |
| 874 | } |
| 875 | else |
| 876 | { |
| 877 | /* Remember whether there is a PLT. */ |
| 878 | plt = true; |
| 879 | } |
| 880 | } |
| 881 | else if (strncmp (name, ".rela", 5) == 0) |
| 882 | { |
| 883 | if (s->_raw_size == 0) |
| 884 | { |
| 885 | /* If we don't need this section, strip it from the |
| 886 | output file. This is mostly to handle .rela.bss and |
| 887 | .rela.plt. We must create both sections in |
| 888 | create_dynamic_sections, because they must be created |
| 889 | before the linker maps input sections to output |
| 890 | sections. The linker does that before |
| 891 | adjust_dynamic_symbol is called, and it is that |
| 892 | function which decides whether anything needs to go |
| 893 | into these sections. */ |
| 894 | strip = true; |
| 895 | } |
| 896 | else |
| 897 | { |
| 898 | asection *target; |
| 899 | |
| 900 | /* Remember whether there are any reloc sections other |
| 901 | than .rela.plt. */ |
| 902 | if (strcmp (name, ".rela.plt") != 0) |
| 903 | { |
| 904 | const char *outname; |
| 905 | |
| 906 | relocs = true; |
| 907 | |
| 908 | /* If this relocation section applies to a read only |
| 909 | section, then we probably need a DT_TEXTREL |
| 910 | entry. .rela.plt is actually associated with |
| 911 | .got.plt, which is never readonly. */ |
| 912 | outname = bfd_get_section_name (output_bfd, |
| 913 | s->output_section); |
| 914 | target = bfd_get_section_by_name (output_bfd, outname + 5); |
| 915 | if (target != NULL |
| 916 | && (target->flags & SEC_READONLY) != 0 |
| 917 | && (target->flags & SEC_ALLOC) != 0) |
| 918 | reltext = true; |
| 919 | } |
| 920 | |
| 921 | /* We use the reloc_count field as a counter if we need |
| 922 | to copy relocs into the output file. */ |
| 923 | s->reloc_count = 0; |
| 924 | } |
| 925 | } |
| 926 | else if (strncmp (name, ".got", 4) != 0) |
| 927 | { |
| 928 | /* It's not one of our sections, so don't allocate space. */ |
| 929 | continue; |
| 930 | } |
| 931 | |
| 932 | if (strip) |
| 933 | { |
| 934 | asection **spp; |
| 935 | |
| 936 | for (spp = &s->output_section->owner->sections; |
| 937 | *spp != s->output_section; |
| 938 | spp = &(*spp)->next) |
| 939 | ; |
| 940 | *spp = s->output_section->next; |
| 941 | --s->output_section->owner->section_count; |
| 942 | |
| 943 | continue; |
| 944 | } |
| 945 | |
| 946 | /* Allocate memory for the section contents. */ |
| 947 | s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); |
| 948 | if (s->contents == NULL && s->_raw_size != 0) |
| 949 | return false; |
| 950 | } |
| 951 | |
| 952 | if (elf_hash_table (info)->dynamic_sections_created) |
| 953 | { |
| 954 | /* Add some entries to the .dynamic section. We fill in the |
| 955 | values later, in elf_m68k_finish_dynamic_sections, but we |
| 956 | must add the entries now so that we get the correct size for |
| 957 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 958 | dynamic linker and used by the debugger. */ |
| 959 | if (!info->shared) |
| 960 | { |
| 961 | if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) |
| 962 | return false; |
| 963 | } |
| 964 | |
| 965 | if (plt) |
| 966 | { |
| 967 | if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) |
| 968 | || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) |
| 969 | || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA) |
| 970 | || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) |
| 971 | return false; |
| 972 | } |
| 973 | |
| 974 | if (relocs) |
| 975 | { |
| 976 | if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0) |
| 977 | || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0) |
| 978 | || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT, |
| 979 | sizeof (Elf32_External_Rela))) |
| 980 | return false; |
| 981 | } |
| 982 | |
| 983 | if (reltext) |
| 984 | { |
| 985 | if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) |
| 986 | return false; |
| 987 | } |
| 988 | } |
| 989 | |
| 990 | /* If we are generating a shared library, we generate a section |
| 991 | symbol for each output section for which we might need to copy |
| 992 | relocs. These are local symbols, which means that they must come |
| 993 | first in the dynamic symbol table. That means we must increment |
| 994 | the dynamic symbol index of every other dynamic symbol. */ |
| 995 | if (info->shared) |
| 996 | { |
| 997 | int c; |
| 998 | |
| 999 | c = 0; |
| 1000 | for (s = output_bfd->sections; s != NULL; s = s->next) |
| 1001 | { |
| 1002 | if ((s->flags & SEC_LINKER_CREATED) != 0 |
| 1003 | || (s->flags & SEC_ALLOC) == 0) |
| 1004 | continue; |
| 1005 | |
| 1006 | elf_section_data (s)->dynindx = c + 1; |
| 1007 | |
| 1008 | /* These symbols will have no names, so we don't need to |
| 1009 | fiddle with dynstr_index. */ |
| 1010 | |
| 1011 | ++c; |
| 1012 | } |
| 1013 | |
| 1014 | elf_link_hash_traverse (elf_hash_table (info), |
| 1015 | elf_m68k_adjust_dynindx, |
| 1016 | (PTR) &c); |
| 1017 | elf_hash_table (info)->dynsymcount += c; |
| 1018 | } |
| 1019 | |
| 1020 | return true; |
| 1021 | } |
| 1022 | |
| 1023 | /* Increment the index of a dynamic symbol by a given amount. Called |
| 1024 | via elf_link_hash_traverse. */ |
| 1025 | |
| 1026 | static boolean |
| 1027 | elf_m68k_adjust_dynindx (h, cparg) |
| 1028 | struct elf_link_hash_entry *h; |
| 1029 | PTR cparg; |
| 1030 | { |
| 1031 | int *cp = (int *) cparg; |
| 1032 | |
| 1033 | if (h->dynindx != -1) |
| 1034 | h->dynindx += *cp; |
| 1035 | return true; |
| 1036 | } |
| 1037 | |
| 1038 | /* This function is called via elf_m68k_link_hash_traverse if we are |
| 1039 | creating a shared object with -Bsymbolic. It discards the space |
| 1040 | allocated to copy PC relative relocs against symbols which are defined |
| 1041 | in regular objects. We allocated space for them in the check_relocs |
| 1042 | routine, but we won't fill them in in the relocate_section routine. */ |
| 1043 | |
| 1044 | /*ARGSUSED*/ |
| 1045 | static boolean |
| 1046 | elf_m68k_discard_copies (h, ignore) |
| 1047 | struct elf_m68k_link_hash_entry *h; |
| 1048 | PTR ignore; |
| 1049 | { |
| 1050 | struct elf_m68k_pcrel_relocs_copied *s; |
| 1051 | |
| 1052 | /* We only discard relocs for symbols defined in a regular object. */ |
| 1053 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1054 | return true; |
| 1055 | |
| 1056 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) |
| 1057 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela); |
| 1058 | |
| 1059 | return true; |
| 1060 | } |
| 1061 | |
| 1062 | /* Relocate an M68K ELF section. */ |
| 1063 | |
| 1064 | static boolean |
| 1065 | elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section, |
| 1066 | contents, relocs, local_syms, local_sections) |
| 1067 | bfd *output_bfd; |
| 1068 | struct bfd_link_info *info; |
| 1069 | bfd *input_bfd; |
| 1070 | asection *input_section; |
| 1071 | bfd_byte *contents; |
| 1072 | Elf_Internal_Rela *relocs; |
| 1073 | Elf_Internal_Sym *local_syms; |
| 1074 | asection **local_sections; |
| 1075 | { |
| 1076 | bfd *dynobj; |
| 1077 | Elf_Internal_Shdr *symtab_hdr; |
| 1078 | struct elf_link_hash_entry **sym_hashes; |
| 1079 | bfd_vma *local_got_offsets; |
| 1080 | asection *sgot; |
| 1081 | asection *splt; |
| 1082 | asection *sreloc; |
| 1083 | Elf_Internal_Rela *rel; |
| 1084 | Elf_Internal_Rela *relend; |
| 1085 | |
| 1086 | dynobj = elf_hash_table (info)->dynobj; |
| 1087 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1088 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1089 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 1090 | |
| 1091 | sgot = NULL; |
| 1092 | splt = NULL; |
| 1093 | sreloc = NULL; |
| 1094 | |
| 1095 | rel = relocs; |
| 1096 | relend = relocs + input_section->reloc_count; |
| 1097 | for (; rel < relend; rel++) |
| 1098 | { |
| 1099 | int r_type; |
| 1100 | reloc_howto_type *howto; |
| 1101 | unsigned long r_symndx; |
| 1102 | struct elf_link_hash_entry *h; |
| 1103 | Elf_Internal_Sym *sym; |
| 1104 | asection *sec; |
| 1105 | bfd_vma relocation; |
| 1106 | bfd_reloc_status_type r; |
| 1107 | |
| 1108 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1109 | if (r_type < 0 || r_type >= (int) R_68K__max) |
| 1110 | { |
| 1111 | bfd_set_error (bfd_error_bad_value); |
| 1112 | return false; |
| 1113 | } |
| 1114 | howto = howto_table + r_type; |
| 1115 | |
| 1116 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1117 | |
| 1118 | if (info->relocateable) |
| 1119 | { |
| 1120 | /* This is a relocateable link. We don't have to change |
| 1121 | anything, unless the reloc is against a section symbol, |
| 1122 | in which case we have to adjust according to where the |
| 1123 | section symbol winds up in the output section. */ |
| 1124 | if (r_symndx < symtab_hdr->sh_info) |
| 1125 | { |
| 1126 | sym = local_syms + r_symndx; |
| 1127 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 1128 | { |
| 1129 | sec = local_sections[r_symndx]; |
| 1130 | rel->r_addend += sec->output_offset + sym->st_value; |
| 1131 | } |
| 1132 | } |
| 1133 | |
| 1134 | continue; |
| 1135 | } |
| 1136 | |
| 1137 | /* This is a final link. */ |
| 1138 | h = NULL; |
| 1139 | sym = NULL; |
| 1140 | sec = NULL; |
| 1141 | if (r_symndx < symtab_hdr->sh_info) |
| 1142 | { |
| 1143 | sym = local_syms + r_symndx; |
| 1144 | sec = local_sections[r_symndx]; |
| 1145 | relocation = (sec->output_section->vma |
| 1146 | + sec->output_offset |
| 1147 | + sym->st_value); |
| 1148 | } |
| 1149 | else |
| 1150 | { |
| 1151 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1152 | while (h->root.type == bfd_link_hash_indirect |
| 1153 | || h->root.type == bfd_link_hash_warning) |
| 1154 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1155 | if (h->root.type == bfd_link_hash_defined |
| 1156 | || h->root.type == bfd_link_hash_defweak) |
| 1157 | { |
| 1158 | sec = h->root.u.def.section; |
| 1159 | if (((r_type == R_68K_PLT8 |
| 1160 | || r_type == R_68K_PLT16 |
| 1161 | || r_type == R_68K_PLT32 |
| 1162 | || r_type == R_68K_PLT8O |
| 1163 | || r_type == R_68K_PLT16O |
| 1164 | || r_type == R_68K_PLT32O) |
| 1165 | && h->plt.offset != (bfd_vma) -1) |
| 1166 | || ((r_type == R_68K_GOT8O |
| 1167 | || r_type == R_68K_GOT16O |
| 1168 | || r_type == R_68K_GOT32O |
| 1169 | || ((r_type == R_68K_GOT8 |
| 1170 | || r_type == R_68K_GOT16 |
| 1171 | || r_type == R_68K_GOT32) |
| 1172 | && strcmp (h->root.root.string, |
| 1173 | "_GLOBAL_OFFSET_TABLE_") != 0)) |
| 1174 | && elf_hash_table (info)->dynamic_sections_created |
| 1175 | && (! info->shared |
| 1176 | || (! info->symbolic && h->dynindx != -1) |
| 1177 | || (h->elf_link_hash_flags |
| 1178 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 1179 | || (info->shared |
| 1180 | && ((! info->symbolic && h->dynindx != -1) |
| 1181 | || (h->elf_link_hash_flags |
| 1182 | & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1183 | && (input_section->flags & SEC_ALLOC) != 0 |
| 1184 | && (r_type == R_68K_8 |
| 1185 | || r_type == R_68K_16 |
| 1186 | || r_type == R_68K_32 |
| 1187 | || r_type == R_68K_PC8 |
| 1188 | || r_type == R_68K_PC16 |
| 1189 | || r_type == R_68K_PC32))) |
| 1190 | { |
| 1191 | /* In these cases, we don't need the relocation |
| 1192 | value. We check specially because in some |
| 1193 | obscure cases sec->output_section will be NULL. */ |
| 1194 | relocation = 0; |
| 1195 | } |
| 1196 | else |
| 1197 | relocation = (h->root.u.def.value |
| 1198 | + sec->output_section->vma |
| 1199 | + sec->output_offset); |
| 1200 | } |
| 1201 | else if (h->root.type == bfd_link_hash_undefweak) |
| 1202 | relocation = 0; |
| 1203 | else if (info->shared && !info->symbolic) |
| 1204 | relocation = 0; |
| 1205 | else |
| 1206 | { |
| 1207 | if (!(info->callbacks->undefined_symbol |
| 1208 | (info, h->root.root.string, input_bfd, |
| 1209 | input_section, rel->r_offset))) |
| 1210 | return false; |
| 1211 | relocation = 0; |
| 1212 | } |
| 1213 | } |
| 1214 | |
| 1215 | switch (r_type) |
| 1216 | { |
| 1217 | case R_68K_GOT8: |
| 1218 | case R_68K_GOT16: |
| 1219 | case R_68K_GOT32: |
| 1220 | /* Relocation is to the address of the entry for this symbol |
| 1221 | in the global offset table. */ |
| 1222 | if (h != NULL |
| 1223 | && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 1224 | break; |
| 1225 | /* Fall through. */ |
| 1226 | case R_68K_GOT8O: |
| 1227 | case R_68K_GOT16O: |
| 1228 | case R_68K_GOT32O: |
| 1229 | /* Relocation is the offset of the entry for this symbol in |
| 1230 | the global offset table. */ |
| 1231 | |
| 1232 | { |
| 1233 | bfd_vma off; |
| 1234 | |
| 1235 | if (sgot == NULL) |
| 1236 | { |
| 1237 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 1238 | BFD_ASSERT (sgot != NULL); |
| 1239 | } |
| 1240 | |
| 1241 | if (h != NULL) |
| 1242 | { |
| 1243 | off = h->got.offset; |
| 1244 | BFD_ASSERT (off != (bfd_vma) -1); |
| 1245 | |
| 1246 | if (!elf_hash_table (info)->dynamic_sections_created |
| 1247 | || (info->shared |
| 1248 | && (info->symbolic || h->dynindx == -1) |
| 1249 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
| 1250 | { |
| 1251 | /* This is actually a static link, or it is a |
| 1252 | -Bsymbolic link and the symbol is defined |
| 1253 | locally, or the symbol was forced to be local |
| 1254 | because of a version file.. We must initialize |
| 1255 | this entry in the global offset table. Since |
| 1256 | the offset must always be a multiple of 4, we |
| 1257 | use the least significant bit to record whether |
| 1258 | we have initialized it already. |
| 1259 | |
| 1260 | When doing a dynamic link, we create a .rela.got |
| 1261 | relocation entry to initialize the value. This |
| 1262 | is done in the finish_dynamic_symbol routine. */ |
| 1263 | if ((off & 1) != 0) |
| 1264 | off &= ~1; |
| 1265 | else |
| 1266 | { |
| 1267 | bfd_put_32 (output_bfd, relocation, |
| 1268 | sgot->contents + off); |
| 1269 | h->got.offset |= 1; |
| 1270 | } |
| 1271 | } |
| 1272 | } |
| 1273 | else |
| 1274 | { |
| 1275 | BFD_ASSERT (local_got_offsets != NULL |
| 1276 | && local_got_offsets[r_symndx] != (bfd_vma) -1); |
| 1277 | |
| 1278 | off = local_got_offsets[r_symndx]; |
| 1279 | |
| 1280 | /* The offset must always be a multiple of 4. We use |
| 1281 | the least significant bit to record whether we have |
| 1282 | already generated the necessary reloc. */ |
| 1283 | if ((off & 1) != 0) |
| 1284 | off &= ~1; |
| 1285 | else |
| 1286 | { |
| 1287 | bfd_put_32 (output_bfd, relocation, sgot->contents + off); |
| 1288 | |
| 1289 | if (info->shared) |
| 1290 | { |
| 1291 | asection *srelgot; |
| 1292 | Elf_Internal_Rela outrel; |
| 1293 | |
| 1294 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); |
| 1295 | BFD_ASSERT (srelgot != NULL); |
| 1296 | |
| 1297 | outrel.r_offset = (sgot->output_section->vma |
| 1298 | + sgot->output_offset |
| 1299 | + off); |
| 1300 | outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); |
| 1301 | outrel.r_addend = relocation; |
| 1302 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, |
| 1303 | (((Elf32_External_Rela *) |
| 1304 | srelgot->contents) |
| 1305 | + srelgot->reloc_count)); |
| 1306 | ++srelgot->reloc_count; |
| 1307 | } |
| 1308 | |
| 1309 | local_got_offsets[r_symndx] |= 1; |
| 1310 | } |
| 1311 | } |
| 1312 | |
| 1313 | relocation = sgot->output_offset + off; |
| 1314 | if (r_type == R_68K_GOT8O |
| 1315 | || r_type == R_68K_GOT16O |
| 1316 | || r_type == R_68K_GOT32O) |
| 1317 | { |
| 1318 | /* This relocation does not use the addend. */ |
| 1319 | rel->r_addend = 0; |
| 1320 | } |
| 1321 | else |
| 1322 | relocation += sgot->output_section->vma; |
| 1323 | } |
| 1324 | break; |
| 1325 | |
| 1326 | case R_68K_PLT8: |
| 1327 | case R_68K_PLT16: |
| 1328 | case R_68K_PLT32: |
| 1329 | /* Relocation is to the entry for this symbol in the |
| 1330 | procedure linkage table. */ |
| 1331 | |
| 1332 | /* Resolve a PLTxx reloc against a local symbol directly, |
| 1333 | without using the procedure linkage table. */ |
| 1334 | if (h == NULL) |
| 1335 | break; |
| 1336 | |
| 1337 | if (h->plt.offset == (bfd_vma) -1) |
| 1338 | { |
| 1339 | /* We didn't make a PLT entry for this symbol. This |
| 1340 | happens when statically linking PIC code, or when |
| 1341 | using -Bsymbolic. */ |
| 1342 | break; |
| 1343 | } |
| 1344 | |
| 1345 | if (splt == NULL) |
| 1346 | { |
| 1347 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 1348 | BFD_ASSERT (splt != NULL); |
| 1349 | } |
| 1350 | |
| 1351 | relocation = (splt->output_section->vma |
| 1352 | + splt->output_offset |
| 1353 | + h->plt.offset); |
| 1354 | break; |
| 1355 | |
| 1356 | case R_68K_PLT8O: |
| 1357 | case R_68K_PLT16O: |
| 1358 | case R_68K_PLT32O: |
| 1359 | /* Relocation is the offset of the entry for this symbol in |
| 1360 | the procedure linkage table. */ |
| 1361 | BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1); |
| 1362 | |
| 1363 | if (splt == NULL) |
| 1364 | { |
| 1365 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 1366 | BFD_ASSERT (splt != NULL); |
| 1367 | } |
| 1368 | |
| 1369 | relocation = h->plt.offset; |
| 1370 | |
| 1371 | /* This relocation does not use the addend. */ |
| 1372 | rel->r_addend = 0; |
| 1373 | |
| 1374 | break; |
| 1375 | |
| 1376 | case R_68K_PC8: |
| 1377 | case R_68K_PC16: |
| 1378 | case R_68K_PC32: |
| 1379 | if (h == NULL) |
| 1380 | break; |
| 1381 | /* Fall through. */ |
| 1382 | case R_68K_8: |
| 1383 | case R_68K_16: |
| 1384 | case R_68K_32: |
| 1385 | if (info->shared |
| 1386 | && (input_section->flags & SEC_ALLOC) != 0 |
| 1387 | && ((r_type != R_68K_PC8 |
| 1388 | && r_type != R_68K_PC16 |
| 1389 | && r_type != R_68K_PC32) |
| 1390 | || (!info->symbolic |
| 1391 | || (h->elf_link_hash_flags |
| 1392 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) |
| 1393 | { |
| 1394 | Elf_Internal_Rela outrel; |
| 1395 | boolean skip, relocate; |
| 1396 | |
| 1397 | /* When generating a shared object, these relocations |
| 1398 | are copied into the output file to be resolved at run |
| 1399 | time. */ |
| 1400 | |
| 1401 | if (sreloc == NULL) |
| 1402 | { |
| 1403 | const char *name; |
| 1404 | |
| 1405 | name = (bfd_elf_string_from_elf_section |
| 1406 | (input_bfd, |
| 1407 | elf_elfheader (input_bfd)->e_shstrndx, |
| 1408 | elf_section_data (input_section)->rel_hdr.sh_name)); |
| 1409 | if (name == NULL) |
| 1410 | return false; |
| 1411 | |
| 1412 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 |
| 1413 | && strcmp (bfd_get_section_name (input_bfd, |
| 1414 | input_section), |
| 1415 | name + 5) == 0); |
| 1416 | |
| 1417 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 1418 | BFD_ASSERT (sreloc != NULL); |
| 1419 | } |
| 1420 | |
| 1421 | skip = false; |
| 1422 | |
| 1423 | if (elf_section_data (input_section)->stab_info == NULL) |
| 1424 | outrel.r_offset = rel->r_offset; |
| 1425 | else |
| 1426 | { |
| 1427 | bfd_vma off; |
| 1428 | |
| 1429 | off = (_bfd_stab_section_offset |
| 1430 | (output_bfd, &elf_hash_table (info)->stab_info, |
| 1431 | input_section, |
| 1432 | &elf_section_data (input_section)->stab_info, |
| 1433 | rel->r_offset)); |
| 1434 | if (off == (bfd_vma) -1) |
| 1435 | skip = true; |
| 1436 | outrel.r_offset = off; |
| 1437 | } |
| 1438 | |
| 1439 | outrel.r_offset += (input_section->output_section->vma |
| 1440 | + input_section->output_offset); |
| 1441 | |
| 1442 | if (skip) |
| 1443 | { |
| 1444 | memset (&outrel, 0, sizeof outrel); |
| 1445 | relocate = false; |
| 1446 | } |
| 1447 | /* h->dynindx may be -1 if the symbol was marked to |
| 1448 | become local. */ |
| 1449 | else if (h != NULL |
| 1450 | && ((! info->symbolic && h->dynindx != -1) |
| 1451 | || (h->elf_link_hash_flags |
| 1452 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 1453 | { |
| 1454 | BFD_ASSERT (h->dynindx != -1); |
| 1455 | relocate = false; |
| 1456 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 1457 | outrel.r_addend = relocation + rel->r_addend; |
| 1458 | } |
| 1459 | else |
| 1460 | { |
| 1461 | if (r_type == R_68K_32) |
| 1462 | { |
| 1463 | relocate = true; |
| 1464 | outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); |
| 1465 | outrel.r_addend = relocation + rel->r_addend; |
| 1466 | } |
| 1467 | else |
| 1468 | { |
| 1469 | long indx; |
| 1470 | |
| 1471 | if (h == NULL) |
| 1472 | sec = local_sections[r_symndx]; |
| 1473 | else |
| 1474 | { |
| 1475 | BFD_ASSERT (h->root.type == bfd_link_hash_defined |
| 1476 | || (h->root.type |
| 1477 | == bfd_link_hash_defweak)); |
| 1478 | sec = h->root.u.def.section; |
| 1479 | } |
| 1480 | if (sec != NULL && bfd_is_abs_section (sec)) |
| 1481 | indx = 0; |
| 1482 | else if (sec == NULL || sec->owner == NULL) |
| 1483 | { |
| 1484 | bfd_set_error (bfd_error_bad_value); |
| 1485 | return false; |
| 1486 | } |
| 1487 | else |
| 1488 | { |
| 1489 | asection *osec; |
| 1490 | |
| 1491 | osec = sec->output_section; |
| 1492 | indx = elf_section_data (osec)->dynindx; |
| 1493 | BFD_ASSERT (indx > 0); |
| 1494 | } |
| 1495 | |
| 1496 | relocate = false; |
| 1497 | outrel.r_info = ELF32_R_INFO (indx, r_type); |
| 1498 | outrel.r_addend = relocation + rel->r_addend; |
| 1499 | } |
| 1500 | } |
| 1501 | |
| 1502 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, |
| 1503 | (((Elf32_External_Rela *) |
| 1504 | sreloc->contents) |
| 1505 | + sreloc->reloc_count)); |
| 1506 | ++sreloc->reloc_count; |
| 1507 | |
| 1508 | /* This reloc will be computed at runtime, so there's no |
| 1509 | need to do anything now, except for R_68K_32 |
| 1510 | relocations that have been turned into |
| 1511 | R_68K_RELATIVE. */ |
| 1512 | if (!relocate) |
| 1513 | continue; |
| 1514 | } |
| 1515 | |
| 1516 | break; |
| 1517 | |
| 1518 | default: |
| 1519 | break; |
| 1520 | } |
| 1521 | |
| 1522 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1523 | contents, rel->r_offset, |
| 1524 | relocation, rel->r_addend); |
| 1525 | |
| 1526 | if (r != bfd_reloc_ok) |
| 1527 | { |
| 1528 | switch (r) |
| 1529 | { |
| 1530 | default: |
| 1531 | case bfd_reloc_outofrange: |
| 1532 | abort (); |
| 1533 | case bfd_reloc_overflow: |
| 1534 | { |
| 1535 | const char *name; |
| 1536 | |
| 1537 | if (h != NULL) |
| 1538 | name = h->root.root.string; |
| 1539 | else |
| 1540 | { |
| 1541 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 1542 | symtab_hdr->sh_link, |
| 1543 | sym->st_name); |
| 1544 | if (name == NULL) |
| 1545 | return false; |
| 1546 | if (*name == '\0') |
| 1547 | name = bfd_section_name (input_bfd, sec); |
| 1548 | } |
| 1549 | if (!(info->callbacks->reloc_overflow |
| 1550 | (info, name, howto->name, (bfd_vma) 0, |
| 1551 | input_bfd, input_section, rel->r_offset))) |
| 1552 | return false; |
| 1553 | } |
| 1554 | break; |
| 1555 | } |
| 1556 | } |
| 1557 | } |
| 1558 | |
| 1559 | return true; |
| 1560 | } |
| 1561 | |
| 1562 | /* Finish up dynamic symbol handling. We set the contents of various |
| 1563 | dynamic sections here. */ |
| 1564 | |
| 1565 | static boolean |
| 1566 | elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym) |
| 1567 | bfd *output_bfd; |
| 1568 | struct bfd_link_info *info; |
| 1569 | struct elf_link_hash_entry *h; |
| 1570 | Elf_Internal_Sym *sym; |
| 1571 | { |
| 1572 | bfd *dynobj; |
| 1573 | |
| 1574 | dynobj = elf_hash_table (info)->dynobj; |
| 1575 | |
| 1576 | if (h->plt.offset != (bfd_vma) -1) |
| 1577 | { |
| 1578 | asection *splt; |
| 1579 | asection *sgot; |
| 1580 | asection *srela; |
| 1581 | bfd_vma plt_index; |
| 1582 | bfd_vma got_offset; |
| 1583 | Elf_Internal_Rela rela; |
| 1584 | |
| 1585 | /* This symbol has an entry in the procedure linkage table. Set |
| 1586 | it up. */ |
| 1587 | |
| 1588 | BFD_ASSERT (h->dynindx != -1); |
| 1589 | |
| 1590 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 1591 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 1592 | srela = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| 1593 | BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); |
| 1594 | |
| 1595 | /* Get the index in the procedure linkage table which |
| 1596 | corresponds to this symbol. This is the index of this symbol |
| 1597 | in all the symbols for which we are making plt entries. The |
| 1598 | first entry in the procedure linkage table is reserved. */ |
| 1599 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 1600 | |
| 1601 | /* Get the offset into the .got table of the entry that |
| 1602 | corresponds to this function. Each .got entry is 4 bytes. |
| 1603 | The first three are reserved. */ |
| 1604 | got_offset = (plt_index + 3) * 4; |
| 1605 | |
| 1606 | /* Fill in the entry in the procedure linkage table. */ |
| 1607 | memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry, |
| 1608 | PLT_ENTRY_SIZE); |
| 1609 | /* The offset is relative to the first extension word. */ |
| 1610 | bfd_put_32 (output_bfd, |
| 1611 | (sgot->output_section->vma |
| 1612 | + sgot->output_offset |
| 1613 | + got_offset |
| 1614 | - (splt->output_section->vma |
| 1615 | + h->plt.offset + 2)), |
| 1616 | splt->contents + h->plt.offset + 4); |
| 1617 | |
| 1618 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), |
| 1619 | splt->contents + h->plt.offset + 10); |
| 1620 | bfd_put_32 (output_bfd, - (h->plt.offset + 16), |
| 1621 | splt->contents + h->plt.offset + 16); |
| 1622 | |
| 1623 | /* Fill in the entry in the global offset table. */ |
| 1624 | bfd_put_32 (output_bfd, |
| 1625 | (splt->output_section->vma |
| 1626 | + splt->output_offset |
| 1627 | + h->plt.offset |
| 1628 | + 8), |
| 1629 | sgot->contents + got_offset); |
| 1630 | |
| 1631 | /* Fill in the entry in the .rela.plt section. */ |
| 1632 | rela.r_offset = (sgot->output_section->vma |
| 1633 | + sgot->output_offset |
| 1634 | + got_offset); |
| 1635 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT); |
| 1636 | rela.r_addend = 0; |
| 1637 | bfd_elf32_swap_reloca_out (output_bfd, &rela, |
| 1638 | ((Elf32_External_Rela *) srela->contents |
| 1639 | + plt_index)); |
| 1640 | |
| 1641 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1642 | { |
| 1643 | /* Mark the symbol as undefined, rather than as defined in |
| 1644 | the .plt section. Leave the value alone. */ |
| 1645 | sym->st_shndx = SHN_UNDEF; |
| 1646 | } |
| 1647 | } |
| 1648 | |
| 1649 | if (h->got.offset != (bfd_vma) -1) |
| 1650 | { |
| 1651 | asection *sgot; |
| 1652 | asection *srela; |
| 1653 | Elf_Internal_Rela rela; |
| 1654 | |
| 1655 | /* This symbol has an entry in the global offset table. Set it |
| 1656 | up. */ |
| 1657 | |
| 1658 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 1659 | srela = bfd_get_section_by_name (dynobj, ".rela.got"); |
| 1660 | BFD_ASSERT (sgot != NULL && srela != NULL); |
| 1661 | |
| 1662 | rela.r_offset = (sgot->output_section->vma |
| 1663 | + sgot->output_offset |
| 1664 | + (h->got.offset &~ 1)); |
| 1665 | |
| 1666 | /* If this is a -Bsymbolic link, and the symbol is defined |
| 1667 | locally, we just want to emit a RELATIVE reloc. Likewise if |
| 1668 | the symbol was forced to be local because of a version file. |
| 1669 | The entry in the global offset table will already have been |
| 1670 | initialized in the relocate_section function. */ |
| 1671 | if (info->shared |
| 1672 | && (info->symbolic || h->dynindx == -1) |
| 1673 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) |
| 1674 | { |
| 1675 | rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); |
| 1676 | rela.r_addend = bfd_get_signed_32 (output_bfd, |
| 1677 | (sgot->contents |
| 1678 | + (h->got.offset & ~1))); |
| 1679 | } |
| 1680 | else |
| 1681 | { |
| 1682 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
| 1683 | sgot->contents + (h->got.offset & ~1)); |
| 1684 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); |
| 1685 | rela.r_addend = 0; |
| 1686 | } |
| 1687 | |
| 1688 | bfd_elf32_swap_reloca_out (output_bfd, &rela, |
| 1689 | ((Elf32_External_Rela *) srela->contents |
| 1690 | + srela->reloc_count)); |
| 1691 | ++srela->reloc_count; |
| 1692 | } |
| 1693 | |
| 1694 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| 1695 | { |
| 1696 | asection *s; |
| 1697 | Elf_Internal_Rela rela; |
| 1698 | |
| 1699 | /* This symbol needs a copy reloc. Set it up. */ |
| 1700 | |
| 1701 | BFD_ASSERT (h->dynindx != -1 |
| 1702 | && (h->root.type == bfd_link_hash_defined |
| 1703 | || h->root.type == bfd_link_hash_defweak)); |
| 1704 | |
| 1705 | s = bfd_get_section_by_name (h->root.u.def.section->owner, |
| 1706 | ".rela.bss"); |
| 1707 | BFD_ASSERT (s != NULL); |
| 1708 | |
| 1709 | rela.r_offset = (h->root.u.def.value |
| 1710 | + h->root.u.def.section->output_section->vma |
| 1711 | + h->root.u.def.section->output_offset); |
| 1712 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY); |
| 1713 | rela.r_addend = 0; |
| 1714 | bfd_elf32_swap_reloca_out (output_bfd, &rela, |
| 1715 | ((Elf32_External_Rela *) s->contents |
| 1716 | + s->reloc_count)); |
| 1717 | ++s->reloc_count; |
| 1718 | } |
| 1719 | |
| 1720 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| 1721 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 1722 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 1723 | sym->st_shndx = SHN_ABS; |
| 1724 | |
| 1725 | return true; |
| 1726 | } |
| 1727 | |
| 1728 | /* Finish up the dynamic sections. */ |
| 1729 | |
| 1730 | static boolean |
| 1731 | elf_m68k_finish_dynamic_sections (output_bfd, info) |
| 1732 | bfd *output_bfd; |
| 1733 | struct bfd_link_info *info; |
| 1734 | { |
| 1735 | bfd *dynobj; |
| 1736 | asection *sgot; |
| 1737 | asection *sdyn; |
| 1738 | |
| 1739 | dynobj = elf_hash_table (info)->dynobj; |
| 1740 | |
| 1741 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 1742 | BFD_ASSERT (sgot != NULL); |
| 1743 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 1744 | |
| 1745 | if (elf_hash_table (info)->dynamic_sections_created) |
| 1746 | { |
| 1747 | asection *splt; |
| 1748 | Elf32_External_Dyn *dyncon, *dynconend; |
| 1749 | |
| 1750 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 1751 | BFD_ASSERT (splt != NULL && sdyn != NULL); |
| 1752 | |
| 1753 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 1754 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); |
| 1755 | for (; dyncon < dynconend; dyncon++) |
| 1756 | { |
| 1757 | Elf_Internal_Dyn dyn; |
| 1758 | const char *name; |
| 1759 | asection *s; |
| 1760 | |
| 1761 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 1762 | |
| 1763 | switch (dyn.d_tag) |
| 1764 | { |
| 1765 | default: |
| 1766 | break; |
| 1767 | |
| 1768 | case DT_PLTGOT: |
| 1769 | name = ".got"; |
| 1770 | goto get_vma; |
| 1771 | case DT_JMPREL: |
| 1772 | name = ".rela.plt"; |
| 1773 | get_vma: |
| 1774 | s = bfd_get_section_by_name (output_bfd, name); |
| 1775 | BFD_ASSERT (s != NULL); |
| 1776 | dyn.d_un.d_ptr = s->vma; |
| 1777 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 1778 | break; |
| 1779 | |
| 1780 | case DT_PLTRELSZ: |
| 1781 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); |
| 1782 | BFD_ASSERT (s != NULL); |
| 1783 | if (s->_cooked_size != 0) |
| 1784 | dyn.d_un.d_val = s->_cooked_size; |
| 1785 | else |
| 1786 | dyn.d_un.d_val = s->_raw_size; |
| 1787 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 1788 | break; |
| 1789 | |
| 1790 | case DT_RELASZ: |
| 1791 | /* The procedure linkage table relocs (DT_JMPREL) should |
| 1792 | not be included in the overall relocs (DT_RELA). |
| 1793 | Therefore, we override the DT_RELASZ entry here to |
| 1794 | make it not include the JMPREL relocs. Since the |
| 1795 | linker script arranges for .rela.plt to follow all |
| 1796 | other relocation sections, we don't have to worry |
| 1797 | about changing the DT_RELA entry. */ |
| 1798 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); |
| 1799 | if (s != NULL) |
| 1800 | { |
| 1801 | if (s->_cooked_size != 0) |
| 1802 | dyn.d_un.d_val -= s->_cooked_size; |
| 1803 | else |
| 1804 | dyn.d_un.d_val -= s->_raw_size; |
| 1805 | } |
| 1806 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 1807 | break; |
| 1808 | } |
| 1809 | } |
| 1810 | |
| 1811 | /* Fill in the first entry in the procedure linkage table. */ |
| 1812 | if (splt->_raw_size > 0) |
| 1813 | { |
| 1814 | memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE); |
| 1815 | bfd_put_32 (output_bfd, |
| 1816 | (sgot->output_section->vma |
| 1817 | + sgot->output_offset + 4 |
| 1818 | - (splt->output_section->vma + 2)), |
| 1819 | splt->contents + 4); |
| 1820 | bfd_put_32 (output_bfd, |
| 1821 | (sgot->output_section->vma |
| 1822 | + sgot->output_offset + 8 |
| 1823 | - (splt->output_section->vma + 10)), |
| 1824 | splt->contents + 12); |
| 1825 | } |
| 1826 | |
| 1827 | elf_section_data (splt->output_section)->this_hdr.sh_entsize |
| 1828 | = PLT_ENTRY_SIZE; |
| 1829 | } |
| 1830 | |
| 1831 | /* Fill in the first three entries in the global offset table. */ |
| 1832 | if (sgot->_raw_size > 0) |
| 1833 | { |
| 1834 | if (sdyn == NULL) |
| 1835 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); |
| 1836 | else |
| 1837 | bfd_put_32 (output_bfd, |
| 1838 | sdyn->output_section->vma + sdyn->output_offset, |
| 1839 | sgot->contents); |
| 1840 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); |
| 1841 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); |
| 1842 | } |
| 1843 | |
| 1844 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; |
| 1845 | |
| 1846 | if (info->shared) |
| 1847 | { |
| 1848 | asection *sdynsym; |
| 1849 | asection *s; |
| 1850 | Elf_Internal_Sym sym; |
| 1851 | int c; |
| 1852 | |
| 1853 | /* Set up the section symbols for the output sections. */ |
| 1854 | |
| 1855 | sdynsym = bfd_get_section_by_name (dynobj, ".dynsym"); |
| 1856 | BFD_ASSERT (sdynsym != NULL); |
| 1857 | |
| 1858 | sym.st_size = 0; |
| 1859 | sym.st_name = 0; |
| 1860 | sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); |
| 1861 | sym.st_other = 0; |
| 1862 | |
| 1863 | c = 0; |
| 1864 | for (s = output_bfd->sections; s != NULL; s = s->next) |
| 1865 | { |
| 1866 | int indx; |
| 1867 | |
| 1868 | if (elf_section_data (s)->dynindx == 0) |
| 1869 | continue; |
| 1870 | |
| 1871 | sym.st_value = s->vma; |
| 1872 | |
| 1873 | indx = elf_section_data (s)->this_idx; |
| 1874 | BFD_ASSERT (indx > 0); |
| 1875 | sym.st_shndx = indx; |
| 1876 | |
| 1877 | bfd_elf32_swap_symbol_out (output_bfd, &sym, |
| 1878 | (PTR) (((Elf32_External_Sym *) |
| 1879 | sdynsym->contents) |
| 1880 | + elf_section_data (s)->dynindx)); |
| 1881 | |
| 1882 | ++c; |
| 1883 | } |
| 1884 | |
| 1885 | /* Set the sh_info field of the output .dynsym section to the |
| 1886 | index of the first global symbol. */ |
| 1887 | elf_section_data (sdynsym->output_section)->this_hdr.sh_info = c + 1; |
| 1888 | } |
| 1889 | |
| 1890 | return true; |
| 1891 | } |
| 1892 | |
| 1893 | #define TARGET_BIG_SYM bfd_elf32_m68k_vec |
| 1894 | #define TARGET_BIG_NAME "elf32-m68k" |
| 1895 | #define ELF_MACHINE_CODE EM_68K |
| 1896 | #define ELF_MAXPAGESIZE 0x2000 |
| 1897 | #define elf_backend_create_dynamic_sections \ |
| 1898 | _bfd_elf_create_dynamic_sections |
| 1899 | #define bfd_elf32_bfd_link_hash_table_create \ |
| 1900 | elf_m68k_link_hash_table_create |
| 1901 | #define elf_backend_check_relocs elf_m68k_check_relocs |
| 1902 | #define elf_backend_adjust_dynamic_symbol \ |
| 1903 | elf_m68k_adjust_dynamic_symbol |
| 1904 | #define elf_backend_size_dynamic_sections \ |
| 1905 | elf_m68k_size_dynamic_sections |
| 1906 | #define elf_backend_relocate_section elf_m68k_relocate_section |
| 1907 | #define elf_backend_finish_dynamic_symbol \ |
| 1908 | elf_m68k_finish_dynamic_symbol |
| 1909 | #define elf_backend_finish_dynamic_sections \ |
| 1910 | elf_m68k_finish_dynamic_sections |
| 1911 | #define elf_backend_want_got_plt 1 |
| 1912 | #define elf_backend_plt_readonly 1 |
| 1913 | #define elf_backend_want_plt_sym 0 |
| 1914 | |
| 1915 | #include "elf32-target.h" |