| 1 | /* Generic support for 32-bit ELF |
| 2 | Copyright 1993, 1995, 1998, 1999, 2001, 2002 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "bfd.h" |
| 22 | #include "sysdep.h" |
| 23 | #include "libbfd.h" |
| 24 | #include "elf-bfd.h" |
| 25 | #include "elf/h8.h" |
| 26 | |
| 27 | static reloc_howto_type *elf32_h8_reloc_type_lookup |
| 28 | PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); |
| 29 | static void elf32_h8_info_to_howto |
| 30 | PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); |
| 31 | static void elf32_h8_info_to_howto_rel |
| 32 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); |
| 33 | static unsigned long elf32_h8_mach |
| 34 | PARAMS ((flagword)); |
| 35 | static void elf32_h8_final_write_processing |
| 36 | PARAMS ((bfd *, boolean)); |
| 37 | static boolean elf32_h8_object_p |
| 38 | PARAMS ((bfd *)); |
| 39 | static boolean elf32_h8_merge_private_bfd_data |
| 40 | PARAMS ((bfd *, bfd *)); |
| 41 | static boolean elf32_h8_relax_section |
| 42 | PARAMS ((bfd *, asection *, struct bfd_link_info *, boolean *)); |
| 43 | static boolean elf32_h8_relax_delete_bytes |
| 44 | PARAMS ((bfd *, asection *, bfd_vma, int)); |
| 45 | static boolean elf32_h8_symbol_address_p |
| 46 | PARAMS ((bfd *, asection *, bfd_vma)); |
| 47 | static bfd_byte *elf32_h8_get_relocated_section_contents |
| 48 | PARAMS ((bfd *, struct bfd_link_info *, struct bfd_link_order *, |
| 49 | bfd_byte *, boolean, asymbol **)); |
| 50 | static bfd_reloc_status_type elf32_h8_final_link_relocate |
| 51 | PARAMS ((unsigned long, bfd *, bfd *, asection *, |
| 52 | bfd_byte *, bfd_vma, bfd_vma, bfd_vma, |
| 53 | struct bfd_link_info *, asection *, int)); |
| 54 | static boolean elf32_h8_relocate_section |
| 55 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, |
| 56 | bfd_byte *, Elf_Internal_Rela *, |
| 57 | Elf_Internal_Sym *, asection **)); |
| 58 | static bfd_reloc_status_type special |
| 59 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 60 | |
| 61 | /* This does not include any relocation information, but should be |
| 62 | good enough for GDB or objdump to read the file. */ |
| 63 | |
| 64 | static reloc_howto_type h8_elf_howto_table[] = |
| 65 | { |
| 66 | #define R_H8_NONE_X 0 |
| 67 | HOWTO (R_H8_NONE, /* type */ |
| 68 | 0, /* rightshift */ |
| 69 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 70 | 0, /* bitsize */ |
| 71 | false, /* pc_relative */ |
| 72 | 0, /* bitpos */ |
| 73 | complain_overflow_dont, /* complain_on_overflow */ |
| 74 | special, /* special_function */ |
| 75 | "R_H8_NONE", /* name */ |
| 76 | false, /* partial_inplace */ |
| 77 | 0, /* src_mask */ |
| 78 | 0, /* dst_mask */ |
| 79 | false), /* pcrel_offset */ |
| 80 | #define R_H8_DIR32_X (R_H8_NONE_X + 1) |
| 81 | HOWTO (R_H8_DIR32, /* type */ |
| 82 | 0, /* rightshift */ |
| 83 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 84 | 32, /* bitsize */ |
| 85 | false, /* pc_relative */ |
| 86 | 0, /* bitpos */ |
| 87 | complain_overflow_dont, /* complain_on_overflow */ |
| 88 | special, /* special_function */ |
| 89 | "R_H8_DIR32", /* name */ |
| 90 | false, /* partial_inplace */ |
| 91 | 0, /* src_mask */ |
| 92 | 0xffffffff, /* dst_mask */ |
| 93 | false), /* pcrel_offset */ |
| 94 | #define R_H8_DIR16_X (R_H8_DIR32_X + 1) |
| 95 | HOWTO (R_H8_DIR16, /* type */ |
| 96 | 0, /* rightshift */ |
| 97 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 98 | 16, /* bitsize */ |
| 99 | false, /* pc_relative */ |
| 100 | 0, /* bitpos */ |
| 101 | complain_overflow_dont, /* complain_on_overflow */ |
| 102 | special, /* special_function */ |
| 103 | "R_H8_DIR16", /* name */ |
| 104 | false, /* partial_inplace */ |
| 105 | 0, /* src_mask */ |
| 106 | 0x0000ffff, /* dst_mask */ |
| 107 | false), /* pcrel_offset */ |
| 108 | #define R_H8_DIR8_X (R_H8_DIR16_X + 1) |
| 109 | HOWTO (R_H8_DIR8, /* type */ |
| 110 | 0, /* rightshift */ |
| 111 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 112 | 8, /* bitsize */ |
| 113 | false, /* pc_relative */ |
| 114 | 0, /* bitpos */ |
| 115 | complain_overflow_dont, /* complain_on_overflow */ |
| 116 | special, /* special_function */ |
| 117 | "R_H8_DIR16", /* name */ |
| 118 | false, /* partial_inplace */ |
| 119 | 0, /* src_mask */ |
| 120 | 0x000000ff, /* dst_mask */ |
| 121 | false), /* pcrel_offset */ |
| 122 | #define R_H8_DIR16A8_X (R_H8_DIR8_X + 1) |
| 123 | HOWTO (R_H8_DIR16A8, /* type */ |
| 124 | 0, /* rightshift */ |
| 125 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 126 | 16, /* bitsize */ |
| 127 | false, /* pc_relative */ |
| 128 | 0, /* bitpos */ |
| 129 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 130 | special, /* special_function */ |
| 131 | "R_H8_DIR16A8", /* name */ |
| 132 | false, /* partial_inplace */ |
| 133 | 0, /* src_mask */ |
| 134 | 0x0000ffff, /* dst_mask */ |
| 135 | false), /* pcrel_offset */ |
| 136 | #define R_H8_DIR16R8_X (R_H8_DIR16A8_X + 1) |
| 137 | HOWTO (R_H8_DIR16R8, /* type */ |
| 138 | 0, /* rightshift */ |
| 139 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 140 | 16, /* bitsize */ |
| 141 | false, /* pc_relative */ |
| 142 | 0, /* bitpos */ |
| 143 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 144 | special, /* special_function */ |
| 145 | "R_H8_DIR16R8", /* name */ |
| 146 | false, /* partial_inplace */ |
| 147 | 0, /* src_mask */ |
| 148 | 0x0000ffff, /* dst_mask */ |
| 149 | false), /* pcrel_offset */ |
| 150 | #define R_H8_DIR24A8_X (R_H8_DIR16R8_X + 1) |
| 151 | HOWTO (R_H8_DIR24A8, /* type */ |
| 152 | 0, /* rightshift */ |
| 153 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 154 | 24, /* bitsize */ |
| 155 | false, /* pc_relative */ |
| 156 | 0, /* bitpos */ |
| 157 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 158 | special, /* special_function */ |
| 159 | "R_H8_DIR24A8", /* name */ |
| 160 | true, /* partial_inplace */ |
| 161 | 0xff000000, /* src_mask */ |
| 162 | 0x00ffffff, /* dst_mask */ |
| 163 | false), /* pcrel_offset */ |
| 164 | #define R_H8_DIR24R8_X (R_H8_DIR24A8_X + 1) |
| 165 | HOWTO (R_H8_DIR24R8, /* type */ |
| 166 | 0, /* rightshift */ |
| 167 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 168 | 24, /* bitsize */ |
| 169 | false, /* pc_relative */ |
| 170 | 0, /* bitpos */ |
| 171 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 172 | special, /* special_function */ |
| 173 | "R_H8_DIR24R8", /* name */ |
| 174 | true, /* partial_inplace */ |
| 175 | 0xff000000, /* src_mask */ |
| 176 | 0x00ffffff, /* dst_mask */ |
| 177 | false), /* pcrel_offset */ |
| 178 | #define R_H8_DIR32A16_X (R_H8_DIR24R8_X + 1) |
| 179 | HOWTO (R_H8_DIR32A16, /* type */ |
| 180 | 0, /* rightshift */ |
| 181 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 182 | 32, /* bitsize */ |
| 183 | false, /* pc_relative */ |
| 184 | 0, /* bitpos */ |
| 185 | complain_overflow_dont, /* complain_on_overflow */ |
| 186 | special, /* special_function */ |
| 187 | "R_H8_DIR32", /* name */ |
| 188 | false, /* partial_inplace */ |
| 189 | 0, /* src_mask */ |
| 190 | 0xffffffff, /* dst_mask */ |
| 191 | false), /* pcrel_offset */ |
| 192 | #define R_H8_PCREL16_X (R_H8_DIR32A16_X + 1) |
| 193 | HOWTO (R_H8_PCREL16, /* type */ |
| 194 | 0, /* rightshift */ |
| 195 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 196 | 16, /* bitsize */ |
| 197 | true, /* pc_relative */ |
| 198 | 0, /* bitpos */ |
| 199 | complain_overflow_signed, /* complain_on_overflow */ |
| 200 | special, /* special_function */ |
| 201 | "R_H8_PCREL16", /* name */ |
| 202 | false, /* partial_inplace */ |
| 203 | 0xffff, /* src_mask */ |
| 204 | 0xffff, /* dst_mask */ |
| 205 | true), /* pcrel_offset */ |
| 206 | #define R_H8_PCREL8_X (R_H8_PCREL16_X + 1) |
| 207 | HOWTO (R_H8_PCREL8, /* type */ |
| 208 | 0, /* rightshift */ |
| 209 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 210 | 8, /* bitsize */ |
| 211 | true, /* pc_relative */ |
| 212 | 0, /* bitpos */ |
| 213 | complain_overflow_signed, /* complain_on_overflow */ |
| 214 | special, /* special_function */ |
| 215 | "R_H8_PCREL8", /* name */ |
| 216 | false, /* partial_inplace */ |
| 217 | 0xff, /* src_mask */ |
| 218 | 0xff, /* dst_mask */ |
| 219 | true), /* pcrel_offset */ |
| 220 | }; |
| 221 | |
| 222 | /* This structure is used to map BFD reloc codes to H8 ELF relocs. */ |
| 223 | |
| 224 | struct elf_reloc_map |
| 225 | { |
| 226 | bfd_reloc_code_real_type bfd_reloc_val; |
| 227 | unsigned char howto_index; |
| 228 | }; |
| 229 | |
| 230 | /* An array mapping BFD reloc codes to SH ELF relocs. */ |
| 231 | |
| 232 | static const struct elf_reloc_map h8_reloc_map[] = |
| 233 | { |
| 234 | { BFD_RELOC_NONE, R_H8_NONE_X }, |
| 235 | { BFD_RELOC_32, R_H8_DIR32_X }, |
| 236 | { BFD_RELOC_16, R_H8_DIR16_X }, |
| 237 | { BFD_RELOC_8, R_H8_DIR8_X }, |
| 238 | { BFD_RELOC_H8_DIR16A8, R_H8_DIR16A8_X }, |
| 239 | { BFD_RELOC_H8_DIR16R8, R_H8_DIR16R8_X }, |
| 240 | { BFD_RELOC_H8_DIR24A8, R_H8_DIR24A8_X }, |
| 241 | { BFD_RELOC_H8_DIR24R8, R_H8_DIR24R8_X }, |
| 242 | { BFD_RELOC_H8_DIR32A16, R_H8_DIR32A16_X }, |
| 243 | { BFD_RELOC_16_PCREL, R_H8_PCREL16_X }, |
| 244 | { BFD_RELOC_8_PCREL, R_H8_PCREL8_X }, |
| 245 | }; |
| 246 | |
| 247 | |
| 248 | static reloc_howto_type * |
| 249 | elf32_h8_reloc_type_lookup (abfd, code) |
| 250 | bfd *abfd ATTRIBUTE_UNUSED; |
| 251 | bfd_reloc_code_real_type code; |
| 252 | { |
| 253 | unsigned int i; |
| 254 | |
| 255 | for (i = 0; i < sizeof (h8_reloc_map) / sizeof (struct elf_reloc_map); i++) |
| 256 | { |
| 257 | if (h8_reloc_map[i].bfd_reloc_val == code) |
| 258 | return &h8_elf_howto_table[(int) h8_reloc_map[i].howto_index]; |
| 259 | } |
| 260 | return NULL; |
| 261 | } |
| 262 | |
| 263 | static void |
| 264 | elf32_h8_info_to_howto (abfd, bfd_reloc, elf_reloc) |
| 265 | bfd *abfd ATTRIBUTE_UNUSED; |
| 266 | arelent *bfd_reloc; |
| 267 | Elf32_Internal_Rela *elf_reloc; |
| 268 | { |
| 269 | unsigned int r; |
| 270 | unsigned int i; |
| 271 | |
| 272 | r = ELF32_R_TYPE (elf_reloc->r_info); |
| 273 | for (i = 0; i < sizeof (h8_elf_howto_table) / sizeof (reloc_howto_type); i++) |
| 274 | if (h8_elf_howto_table[i].type== r) |
| 275 | { |
| 276 | bfd_reloc->howto = &h8_elf_howto_table[i]; |
| 277 | return; |
| 278 | } |
| 279 | abort (); |
| 280 | } |
| 281 | |
| 282 | static void |
| 283 | elf32_h8_info_to_howto_rel (abfd, bfd_reloc, elf_reloc) |
| 284 | bfd *abfd ATTRIBUTE_UNUSED; |
| 285 | arelent *bfd_reloc; |
| 286 | Elf32_Internal_Rel *elf_reloc ATTRIBUTE_UNUSED; |
| 287 | { |
| 288 | unsigned int r; |
| 289 | |
| 290 | abort (); |
| 291 | r = ELF32_R_TYPE (elf_reloc->r_info); |
| 292 | bfd_reloc->howto = &h8_elf_howto_table[r]; |
| 293 | } |
| 294 | |
| 295 | /* Special handling for H8/300 relocs. |
| 296 | We only come here for pcrel stuff and return normally if not an -r link. |
| 297 | When doing -r, we can't do any arithmetic for the pcrel stuff, because |
| 298 | we support relaxing on the H8/300 series chips. */ |
| 299 | static bfd_reloc_status_type |
| 300 | special (abfd, reloc_entry, symbol, data, input_section, output_bfd, |
| 301 | error_message) |
| 302 | bfd *abfd ATTRIBUTE_UNUSED; |
| 303 | arelent *reloc_entry ATTRIBUTE_UNUSED; |
| 304 | asymbol *symbol ATTRIBUTE_UNUSED; |
| 305 | PTR data ATTRIBUTE_UNUSED; |
| 306 | asection *input_section ATTRIBUTE_UNUSED; |
| 307 | bfd *output_bfd; |
| 308 | char **error_message ATTRIBUTE_UNUSED; |
| 309 | { |
| 310 | if (output_bfd == (bfd *) NULL) |
| 311 | return bfd_reloc_continue; |
| 312 | |
| 313 | /* Adjust the reloc address to that in the output section. */ |
| 314 | reloc_entry->address += input_section->output_offset; |
| 315 | return bfd_reloc_ok; |
| 316 | } |
| 317 | |
| 318 | /* Perform a relocation as part of a final link. */ |
| 319 | static bfd_reloc_status_type |
| 320 | elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd, |
| 321 | input_section, contents, offset, value, |
| 322 | addend, info, sym_sec, is_local) |
| 323 | unsigned long r_type; |
| 324 | bfd *input_bfd; |
| 325 | bfd *output_bfd ATTRIBUTE_UNUSED; |
| 326 | asection *input_section ATTRIBUTE_UNUSED; |
| 327 | bfd_byte *contents; |
| 328 | bfd_vma offset; |
| 329 | bfd_vma value; |
| 330 | bfd_vma addend; |
| 331 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 332 | asection *sym_sec ATTRIBUTE_UNUSED; |
| 333 | int is_local ATTRIBUTE_UNUSED; |
| 334 | { |
| 335 | bfd_byte *hit_data = contents + offset; |
| 336 | |
| 337 | switch (r_type) |
| 338 | { |
| 339 | |
| 340 | case R_H8_NONE: |
| 341 | return bfd_reloc_ok; |
| 342 | |
| 343 | case R_H8_DIR32: |
| 344 | case R_H8_DIR32A16: |
| 345 | case R_H8_DIR24A8: |
| 346 | value += addend; |
| 347 | bfd_put_32 (input_bfd, value, hit_data); |
| 348 | return bfd_reloc_ok; |
| 349 | |
| 350 | case R_H8_DIR16: |
| 351 | case R_H8_DIR16A8: |
| 352 | case R_H8_DIR16R8: |
| 353 | value += addend; |
| 354 | bfd_put_16 (input_bfd, value, hit_data); |
| 355 | return bfd_reloc_ok; |
| 356 | |
| 357 | /* AKA R_RELBYTE */ |
| 358 | case R_H8_DIR8: |
| 359 | value += addend; |
| 360 | |
| 361 | bfd_put_8 (input_bfd, value, hit_data); |
| 362 | return bfd_reloc_ok; |
| 363 | |
| 364 | case R_H8_DIR24R8: |
| 365 | value += addend; |
| 366 | |
| 367 | /* HIT_DATA is the address for the first byte for the relocated |
| 368 | value. Subtract 1 so that we can manipulate the data in 32bit |
| 369 | hunks. */ |
| 370 | hit_data--; |
| 371 | |
| 372 | /* Clear out the top byte in value. */ |
| 373 | value &= 0xffffff; |
| 374 | |
| 375 | /* Retrieve the type byte for value from the section contents. */ |
| 376 | value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000); |
| 377 | |
| 378 | /* Now scribble it out in one 32bit hunk. */ |
| 379 | bfd_put_32 (input_bfd, value, hit_data); |
| 380 | return bfd_reloc_ok; |
| 381 | |
| 382 | case R_H8_PCREL16: |
| 383 | value -= (input_section->output_section->vma |
| 384 | + input_section->output_offset); |
| 385 | value -= offset; |
| 386 | value += addend; |
| 387 | |
| 388 | /* The value is relative to the start of the instruction, |
| 389 | not the relocation offset. Subtract 2 to account for |
| 390 | this minor issue. */ |
| 391 | value -= 2; |
| 392 | |
| 393 | bfd_put_16 (input_bfd, value, hit_data); |
| 394 | return bfd_reloc_ok; |
| 395 | |
| 396 | case R_H8_PCREL8: |
| 397 | value -= (input_section->output_section->vma |
| 398 | + input_section->output_offset); |
| 399 | value -= offset; |
| 400 | value += addend; |
| 401 | |
| 402 | /* The value is relative to the start of the instruction, |
| 403 | not the relocation offset. Subtract 1 to account for |
| 404 | this minor issue. */ |
| 405 | value -= 1; |
| 406 | |
| 407 | bfd_put_8 (input_bfd, value, hit_data); |
| 408 | return bfd_reloc_ok; |
| 409 | |
| 410 | default: |
| 411 | return bfd_reloc_notsupported; |
| 412 | } |
| 413 | } |
| 414 | \f |
| 415 | /* Relocate an H8 ELF section. */ |
| 416 | static boolean |
| 417 | elf32_h8_relocate_section (output_bfd, info, input_bfd, input_section, |
| 418 | contents, relocs, local_syms, local_sections) |
| 419 | bfd *output_bfd; |
| 420 | struct bfd_link_info *info; |
| 421 | bfd *input_bfd; |
| 422 | asection *input_section; |
| 423 | bfd_byte *contents; |
| 424 | Elf_Internal_Rela *relocs; |
| 425 | Elf_Internal_Sym *local_syms; |
| 426 | asection **local_sections; |
| 427 | { |
| 428 | Elf_Internal_Shdr *symtab_hdr; |
| 429 | struct elf_link_hash_entry **sym_hashes; |
| 430 | Elf_Internal_Rela *rel, *relend; |
| 431 | |
| 432 | if (info->relocateable) |
| 433 | return true; |
| 434 | |
| 435 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 436 | sym_hashes = elf_sym_hashes (input_bfd); |
| 437 | |
| 438 | rel = relocs; |
| 439 | relend = relocs + input_section->reloc_count; |
| 440 | for (; rel < relend; rel++) |
| 441 | { |
| 442 | unsigned int r_type; |
| 443 | unsigned long r_symndx; |
| 444 | Elf_Internal_Sym *sym; |
| 445 | asection *sec; |
| 446 | struct elf_link_hash_entry *h; |
| 447 | bfd_vma relocation; |
| 448 | bfd_reloc_status_type r; |
| 449 | |
| 450 | /* This is a final link. */ |
| 451 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 452 | r_type = ELF32_R_TYPE (rel->r_info); |
| 453 | h = NULL; |
| 454 | sym = NULL; |
| 455 | sec = NULL; |
| 456 | if (r_symndx < symtab_hdr->sh_info) |
| 457 | { |
| 458 | sym = local_syms + r_symndx; |
| 459 | sec = local_sections[r_symndx]; |
| 460 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); |
| 461 | } |
| 462 | else |
| 463 | { |
| 464 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 465 | while (h->root.type == bfd_link_hash_indirect |
| 466 | || h->root.type == bfd_link_hash_warning) |
| 467 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 468 | if (h->root.type == bfd_link_hash_defined |
| 469 | || h->root.type == bfd_link_hash_defweak) |
| 470 | { |
| 471 | sec = h->root.u.def.section; |
| 472 | relocation = (h->root.u.def.value |
| 473 | + sec->output_section->vma |
| 474 | + sec->output_offset); |
| 475 | } |
| 476 | else if (h->root.type == bfd_link_hash_undefweak) |
| 477 | relocation = 0; |
| 478 | else |
| 479 | { |
| 480 | if (! ((*info->callbacks->undefined_symbol) |
| 481 | (info, h->root.root.string, input_bfd, |
| 482 | input_section, rel->r_offset, true))) |
| 483 | return false; |
| 484 | relocation = 0; |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | r = elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd, |
| 489 | input_section, |
| 490 | contents, rel->r_offset, |
| 491 | relocation, rel->r_addend, |
| 492 | info, sec, h == NULL); |
| 493 | |
| 494 | if (r != bfd_reloc_ok) |
| 495 | { |
| 496 | const char *name; |
| 497 | const char *msg = (const char *) 0; |
| 498 | arelent bfd_reloc; |
| 499 | reloc_howto_type *howto; |
| 500 | |
| 501 | elf32_h8_info_to_howto (input_bfd, &bfd_reloc, rel); |
| 502 | howto = bfd_reloc.howto; |
| 503 | |
| 504 | if (h != NULL) |
| 505 | name = h->root.root.string; |
| 506 | else |
| 507 | { |
| 508 | name = (bfd_elf_string_from_elf_section |
| 509 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); |
| 510 | if (name == NULL || *name == '\0') |
| 511 | name = bfd_section_name (input_bfd, sec); |
| 512 | } |
| 513 | |
| 514 | switch (r) |
| 515 | { |
| 516 | case bfd_reloc_overflow: |
| 517 | if (! ((*info->callbacks->reloc_overflow) |
| 518 | (info, name, howto->name, (bfd_vma) 0, |
| 519 | input_bfd, input_section, rel->r_offset))) |
| 520 | return false; |
| 521 | break; |
| 522 | |
| 523 | case bfd_reloc_undefined: |
| 524 | if (! ((*info->callbacks->undefined_symbol) |
| 525 | (info, name, input_bfd, input_section, |
| 526 | rel->r_offset, true))) |
| 527 | return false; |
| 528 | break; |
| 529 | |
| 530 | case bfd_reloc_outofrange: |
| 531 | msg = _("internal error: out of range error"); |
| 532 | goto common_error; |
| 533 | |
| 534 | case bfd_reloc_notsupported: |
| 535 | msg = _("internal error: unsupported relocation error"); |
| 536 | goto common_error; |
| 537 | |
| 538 | case bfd_reloc_dangerous: |
| 539 | msg = _("internal error: dangerous error"); |
| 540 | goto common_error; |
| 541 | |
| 542 | default: |
| 543 | msg = _("internal error: unknown error"); |
| 544 | /* fall through */ |
| 545 | |
| 546 | common_error: |
| 547 | if (!((*info->callbacks->warning) |
| 548 | (info, msg, name, input_bfd, input_section, |
| 549 | rel->r_offset))) |
| 550 | return false; |
| 551 | break; |
| 552 | } |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | return true; |
| 557 | } |
| 558 | |
| 559 | /* Object files encode the specific H8 model they were compiled |
| 560 | for in the ELF flags field. |
| 561 | |
| 562 | Examine that field and return the proper BFD machine type for |
| 563 | the object file. */ |
| 564 | static unsigned long |
| 565 | elf32_h8_mach (flags) |
| 566 | flagword flags; |
| 567 | { |
| 568 | switch (flags & EF_H8_MACH) |
| 569 | { |
| 570 | case E_H8_MACH_H8300: |
| 571 | default: |
| 572 | return bfd_mach_h8300; |
| 573 | |
| 574 | case E_H8_MACH_H8300H: |
| 575 | return bfd_mach_h8300h; |
| 576 | |
| 577 | case E_H8_MACH_H8300S: |
| 578 | return bfd_mach_h8300s; |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | /* The final processing done just before writing out a H8 ELF object |
| 583 | file. We use this opportunity to encode the BFD machine type |
| 584 | into the flags field in the object file. */ |
| 585 | |
| 586 | static void |
| 587 | elf32_h8_final_write_processing (abfd, linker) |
| 588 | bfd *abfd; |
| 589 | boolean linker ATTRIBUTE_UNUSED; |
| 590 | { |
| 591 | unsigned long val; |
| 592 | |
| 593 | switch (bfd_get_mach (abfd)) |
| 594 | { |
| 595 | default: |
| 596 | case bfd_mach_h8300: |
| 597 | val = E_H8_MACH_H8300; |
| 598 | break; |
| 599 | |
| 600 | case bfd_mach_h8300h: |
| 601 | val = E_H8_MACH_H8300H; |
| 602 | break; |
| 603 | |
| 604 | case bfd_mach_h8300s: |
| 605 | val = E_H8_MACH_H8300S; |
| 606 | break; |
| 607 | } |
| 608 | |
| 609 | elf_elfheader (abfd)->e_flags &= ~ (EF_H8_MACH); |
| 610 | elf_elfheader (abfd)->e_flags |= val; |
| 611 | } |
| 612 | |
| 613 | /* Return nonzero if ABFD represents a valid H8 ELF object file; also |
| 614 | record the encoded machine type found in the ELF flags. */ |
| 615 | |
| 616 | static boolean |
| 617 | elf32_h8_object_p (abfd) |
| 618 | bfd *abfd; |
| 619 | { |
| 620 | bfd_default_set_arch_mach (abfd, bfd_arch_h8300, |
| 621 | elf32_h8_mach (elf_elfheader (abfd)->e_flags)); |
| 622 | return true; |
| 623 | } |
| 624 | |
| 625 | /* Merge backend specific data from an object file to the output |
| 626 | object file when linking. The only data we need to copy at this |
| 627 | time is the architecture/machine information. */ |
| 628 | |
| 629 | static boolean |
| 630 | elf32_h8_merge_private_bfd_data (ibfd, obfd) |
| 631 | bfd *ibfd; |
| 632 | bfd *obfd; |
| 633 | { |
| 634 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 635 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 636 | return true; |
| 637 | |
| 638 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) |
| 639 | && bfd_get_mach (obfd) < bfd_get_mach (ibfd)) |
| 640 | { |
| 641 | if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), |
| 642 | bfd_get_mach (ibfd))) |
| 643 | return false; |
| 644 | } |
| 645 | |
| 646 | return true; |
| 647 | } |
| 648 | |
| 649 | /* This function handles relaxing for the H8.. |
| 650 | |
| 651 | There's a few relaxing opportunites available on the H8: |
| 652 | |
| 653 | jmp/jsr:24 -> bra/bsr:8 2 bytes |
| 654 | The jmp may be completely eliminated if the previous insn is a |
| 655 | conditional branch to the insn after the jump. In that case |
| 656 | we invert the branch and delete the jump and save 4 bytes. |
| 657 | |
| 658 | bCC:16 -> bCC:8 2 bytes |
| 659 | bsr:16 -> bsr:8 2 bytes |
| 660 | |
| 661 | mov.b:16 -> mov.b:8 2 bytes |
| 662 | mov.b:24/32 -> mov.b:8 4 bytes |
| 663 | |
| 664 | mov.[bwl]:24/32 -> mov.[bwl]:16 2 bytes */ |
| 665 | |
| 666 | static boolean |
| 667 | elf32_h8_relax_section (abfd, sec, link_info, again) |
| 668 | bfd *abfd; |
| 669 | asection *sec; |
| 670 | struct bfd_link_info *link_info; |
| 671 | boolean *again; |
| 672 | { |
| 673 | Elf_Internal_Shdr *symtab_hdr; |
| 674 | Elf_Internal_Rela *internal_relocs; |
| 675 | Elf_Internal_Rela *irel, *irelend; |
| 676 | bfd_byte *contents = NULL; |
| 677 | Elf_Internal_Sym *isymbuf = NULL; |
| 678 | static asection *last_input_section = NULL; |
| 679 | static Elf_Internal_Rela *last_reloc = NULL; |
| 680 | |
| 681 | /* Assume nothing changes. */ |
| 682 | *again = false; |
| 683 | |
| 684 | /* We don't have to do anything for a relocateable link, if |
| 685 | this section does not have relocs, or if this is not a |
| 686 | code section. */ |
| 687 | if (link_info->relocateable |
| 688 | || (sec->flags & SEC_RELOC) == 0 |
| 689 | || sec->reloc_count == 0 |
| 690 | || (sec->flags & SEC_CODE) == 0) |
| 691 | return true; |
| 692 | |
| 693 | /* If this is the first time we have been called for this section, |
| 694 | initialize the cooked size. */ |
| 695 | if (sec->_cooked_size == 0) |
| 696 | sec->_cooked_size = sec->_raw_size; |
| 697 | |
| 698 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 699 | |
| 700 | /* Get a copy of the native relocations. */ |
| 701 | internal_relocs = (_bfd_elf32_link_read_relocs |
| 702 | (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, |
| 703 | link_info->keep_memory)); |
| 704 | if (internal_relocs == NULL) |
| 705 | goto error_return; |
| 706 | |
| 707 | if (sec != last_input_section) |
| 708 | last_reloc = NULL; |
| 709 | |
| 710 | last_input_section = sec; |
| 711 | |
| 712 | /* Walk through the relocs looking for relaxing opportunities. */ |
| 713 | irelend = internal_relocs + sec->reloc_count; |
| 714 | for (irel = internal_relocs; irel < irelend; irel++) |
| 715 | { |
| 716 | bfd_vma symval; |
| 717 | |
| 718 | /* Keep track of the previous reloc so that we can delete |
| 719 | some long jumps created by the compiler. */ |
| 720 | if (irel != internal_relocs) |
| 721 | last_reloc = irel - 1; |
| 722 | |
| 723 | if (ELF32_R_TYPE (irel->r_info) != R_H8_DIR24R8 |
| 724 | && ELF32_R_TYPE (irel->r_info) != R_H8_PCREL16 |
| 725 | && ELF32_R_TYPE (irel->r_info) != R_H8_DIR16A8 |
| 726 | && ELF32_R_TYPE (irel->r_info) != R_H8_DIR24A8 |
| 727 | && ELF32_R_TYPE (irel->r_info) != R_H8_DIR32A16) |
| 728 | continue; |
| 729 | |
| 730 | /* Get the section contents if we haven't done so already. */ |
| 731 | if (contents == NULL) |
| 732 | { |
| 733 | /* Get cached copy if it exists. */ |
| 734 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 735 | contents = elf_section_data (sec)->this_hdr.contents; |
| 736 | else |
| 737 | { |
| 738 | /* Go get them off disk. */ |
| 739 | contents = (bfd_byte *) bfd_malloc (sec->_raw_size); |
| 740 | if (contents == NULL) |
| 741 | goto error_return; |
| 742 | |
| 743 | if (! bfd_get_section_contents (abfd, sec, contents, |
| 744 | (file_ptr) 0, sec->_raw_size)) |
| 745 | goto error_return; |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | /* Read this BFD's local symbols if we haven't done so already. */ |
| 750 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 751 | { |
| 752 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 753 | if (isymbuf == NULL) |
| 754 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 755 | symtab_hdr->sh_info, 0, |
| 756 | NULL, NULL, NULL); |
| 757 | if (isymbuf == NULL) |
| 758 | goto error_return; |
| 759 | } |
| 760 | |
| 761 | /* Get the value of the symbol referred to by the reloc. */ |
| 762 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 763 | { |
| 764 | /* A local symbol. */ |
| 765 | Elf_Internal_Sym *isym; |
| 766 | asection *sym_sec; |
| 767 | |
| 768 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 769 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 770 | symval = (isym->st_value |
| 771 | + sym_sec->output_section->vma |
| 772 | + sym_sec->output_offset); |
| 773 | } |
| 774 | else |
| 775 | { |
| 776 | unsigned long indx; |
| 777 | struct elf_link_hash_entry *h; |
| 778 | |
| 779 | /* An external symbol. */ |
| 780 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| 781 | h = elf_sym_hashes (abfd)[indx]; |
| 782 | BFD_ASSERT (h != NULL); |
| 783 | if (h->root.type != bfd_link_hash_defined |
| 784 | && h->root.type != bfd_link_hash_defweak) |
| 785 | { |
| 786 | /* This appears to be a reference to an undefined |
| 787 | symbol. Just ignore it--it will be caught by the |
| 788 | regular reloc processing. */ |
| 789 | continue; |
| 790 | } |
| 791 | |
| 792 | symval = (h->root.u.def.value |
| 793 | + h->root.u.def.section->output_section->vma |
| 794 | + h->root.u.def.section->output_offset); |
| 795 | } |
| 796 | |
| 797 | /* For simplicity of coding, we are going to modify the section |
| 798 | contents, the section relocs, and the BFD symbol table. We |
| 799 | must tell the rest of the code not to free up this |
| 800 | information. It would be possible to instead create a table |
| 801 | of changes which have to be made, as is done in coff-mips.c; |
| 802 | that would be more work, but would require less memory when |
| 803 | the linker is run. */ |
| 804 | switch (ELF32_R_TYPE (irel->r_info)) |
| 805 | { |
| 806 | /* Try to turn a 24 bit absolute branch/call into an 8 bit |
| 807 | pc-relative branch/call. */ |
| 808 | case R_H8_DIR24R8: |
| 809 | { |
| 810 | bfd_vma value = symval + irel->r_addend; |
| 811 | bfd_vma dot, gap; |
| 812 | |
| 813 | /* Get the address of this instruction. */ |
| 814 | dot = (sec->output_section->vma |
| 815 | + sec->output_offset + irel->r_offset - 1); |
| 816 | |
| 817 | /* Compute the distance from this insn to the branch target. */ |
| 818 | gap = value - dot; |
| 819 | |
| 820 | /* If the distance is within -126..+130 inclusive, then we can |
| 821 | relax this jump. +130 is valid since the target will move |
| 822 | two bytes closer if we do relax this branch. */ |
| 823 | if ((int) gap >= -126 && (int) gap <= 130) |
| 824 | { |
| 825 | unsigned char code; |
| 826 | |
| 827 | /* Note that we've changed the relocs, section contents, |
| 828 | etc. */ |
| 829 | elf_section_data (sec)->relocs = internal_relocs; |
| 830 | elf_section_data (sec)->this_hdr.contents = contents; |
| 831 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 832 | |
| 833 | /* If the previous instruction conditionally jumped around |
| 834 | this instruction, we may be able to reverse the condition |
| 835 | and redirect the previous instruction to the target of |
| 836 | this instruction. |
| 837 | |
| 838 | Such sequences are used by the compiler to deal with |
| 839 | long conditional branches. */ |
| 840 | if ((int) gap <= 130 |
| 841 | && (int) gap >= -128 |
| 842 | && last_reloc |
| 843 | && ELF32_R_TYPE (last_reloc->r_info) == R_H8_PCREL8 |
| 844 | && ELF32_R_SYM (last_reloc->r_info) < symtab_hdr->sh_info) |
| 845 | { |
| 846 | bfd_vma last_value; |
| 847 | asection *last_sym_sec; |
| 848 | Elf_Internal_Sym *last_sym; |
| 849 | |
| 850 | /* We will need to examine the symbol used by the |
| 851 | previous relocation. */ |
| 852 | |
| 853 | last_sym = isymbuf + ELF32_R_SYM (last_reloc->r_info); |
| 854 | last_sym_sec |
| 855 | = bfd_section_from_elf_index (abfd, last_sym->st_shndx); |
| 856 | last_value = (last_sym->st_value |
| 857 | + last_sym_sec->output_section->vma |
| 858 | + last_sym_sec->output_offset); |
| 859 | |
| 860 | /* Verify that the previous relocation was for a |
| 861 | branch around this instruction and that no symbol |
| 862 | exists at the current location. */ |
| 863 | if (last_value == dot + 4 |
| 864 | && last_reloc->r_offset + 2 == irel->r_offset |
| 865 | && ! elf32_h8_symbol_address_p (abfd, sec, dot)) |
| 866 | { |
| 867 | /* We can eliminate this jump. Twiddle the |
| 868 | previous relocation as necessary. */ |
| 869 | irel->r_info |
| 870 | = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 871 | ELF32_R_TYPE (R_H8_NONE)); |
| 872 | |
| 873 | last_reloc->r_info |
| 874 | = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 875 | ELF32_R_TYPE (R_H8_PCREL8)); |
| 876 | last_reloc->r_addend = irel->r_addend; |
| 877 | |
| 878 | |
| 879 | code = bfd_get_8 (abfd, |
| 880 | contents + last_reloc->r_offset - 1); |
| 881 | code ^= 1; |
| 882 | bfd_put_8 (abfd, |
| 883 | code, |
| 884 | contents + last_reloc->r_offset - 1); |
| 885 | |
| 886 | /* Delete four bytes of data. */ |
| 887 | if (!elf32_h8_relax_delete_bytes (abfd, sec, |
| 888 | irel->r_offset - 1, |
| 889 | 4)) |
| 890 | goto error_return; |
| 891 | |
| 892 | *again = true; |
| 893 | break; |
| 894 | } |
| 895 | } |
| 896 | |
| 897 | /* We could not eliminate this jump, so just shorten it. */ |
| 898 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 899 | |
| 900 | if (code == 0x5e) |
| 901 | bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 1); |
| 902 | else if (code == 0x5a) |
| 903 | bfd_put_8 (abfd, 0x40, contents + irel->r_offset - 1); |
| 904 | else |
| 905 | abort (); |
| 906 | |
| 907 | /* Fix the relocation's type. */ |
| 908 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 909 | R_H8_PCREL8); |
| 910 | |
| 911 | /* Delete two bytes of data. */ |
| 912 | if (!elf32_h8_relax_delete_bytes (abfd, sec, |
| 913 | irel->r_offset + 1, 2)) |
| 914 | goto error_return; |
| 915 | |
| 916 | /* That will change things, so, we should relax again. |
| 917 | Note that this is not required, and it may be slow. */ |
| 918 | *again = true; |
| 919 | } |
| 920 | break; |
| 921 | } |
| 922 | |
| 923 | /* Try to turn a 16bit pc-relative branch into a 8bit pc-relative |
| 924 | branch. */ |
| 925 | case R_H8_PCREL16: |
| 926 | { |
| 927 | bfd_vma value = symval + irel->r_addend; |
| 928 | bfd_vma dot; |
| 929 | bfd_vma gap; |
| 930 | |
| 931 | /* Get the address of this instruction. */ |
| 932 | dot = (sec->output_section->vma |
| 933 | + sec->output_offset |
| 934 | + irel->r_offset - 2); |
| 935 | |
| 936 | gap = value - dot; |
| 937 | |
| 938 | /* If the distance is within -126..+130 inclusive, then we can |
| 939 | relax this jump. +130 is valid since the target will move |
| 940 | two bytes closer if we do relax this branch. */ |
| 941 | if ((int)gap >= -126 && (int)gap <= 130) |
| 942 | { |
| 943 | unsigned char code; |
| 944 | |
| 945 | /* Note that we've changed the relocs, section contents, |
| 946 | etc. */ |
| 947 | elf_section_data (sec)->relocs = internal_relocs; |
| 948 | elf_section_data (sec)->this_hdr.contents = contents; |
| 949 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 950 | |
| 951 | /* Get the opcode. */ |
| 952 | code = bfd_get_8 (abfd, contents + irel->r_offset - 2); |
| 953 | |
| 954 | if (code == 0x58) |
| 955 | { |
| 956 | /* bCC:16 -> bCC:8 */ |
| 957 | /* Get the condition code from the original insn. */ |
| 958 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 959 | code &= 0xf0; |
| 960 | code >>= 4; |
| 961 | code |= 0x40; |
| 962 | bfd_put_8 (abfd, code, contents + irel->r_offset - 2); |
| 963 | } |
| 964 | else if (code == 0x5c) |
| 965 | bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 2); |
| 966 | else |
| 967 | abort (); |
| 968 | |
| 969 | /* Fix the relocation's type. */ |
| 970 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 971 | R_H8_PCREL8); |
| 972 | irel->r_offset--; |
| 973 | |
| 974 | /* Delete two bytes of data. */ |
| 975 | if (!elf32_h8_relax_delete_bytes (abfd, sec, |
| 976 | irel->r_offset + 1, 2)) |
| 977 | goto error_return; |
| 978 | |
| 979 | /* That will change things, so, we should relax again. |
| 980 | Note that this is not required, and it may be slow. */ |
| 981 | *again = true; |
| 982 | } |
| 983 | break; |
| 984 | } |
| 985 | |
| 986 | /* This is a 16 bit absolute address in a "mov.b" insn, which may |
| 987 | become an 8 bit absolute address if its in the right range. */ |
| 988 | case R_H8_DIR16A8: |
| 989 | { |
| 990 | bfd_vma value = symval + irel->r_addend; |
| 991 | |
| 992 | if ((bfd_get_mach (abfd) == bfd_mach_h8300 |
| 993 | && value >= 0xff00 |
| 994 | && value <= 0xffff) |
| 995 | || ((bfd_get_mach (abfd) == bfd_mach_h8300h |
| 996 | || bfd_get_mach (abfd) == bfd_mach_h8300s) |
| 997 | && value >= 0xffff00 |
| 998 | && value <= 0xffffff)) |
| 999 | { |
| 1000 | unsigned char code; |
| 1001 | |
| 1002 | /* Note that we've changed the relocs, section contents, |
| 1003 | etc. */ |
| 1004 | elf_section_data (sec)->relocs = internal_relocs; |
| 1005 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1006 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1007 | |
| 1008 | /* Get the opcode. */ |
| 1009 | code = bfd_get_8 (abfd, contents + irel->r_offset - 2); |
| 1010 | |
| 1011 | /* Sanity check. */ |
| 1012 | if (code != 0x6a) |
| 1013 | abort (); |
| 1014 | |
| 1015 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 1016 | |
| 1017 | if ((code & 0xf0) == 0x00) |
| 1018 | bfd_put_8 (abfd, |
| 1019 | (code & 0xf) | 0x20, |
| 1020 | contents + irel->r_offset - 2); |
| 1021 | else if ((code & 0xf0) == 0x80) |
| 1022 | bfd_put_8 (abfd, |
| 1023 | (code & 0xf) | 0x30, |
| 1024 | contents + irel->r_offset - 2); |
| 1025 | else |
| 1026 | abort (); |
| 1027 | |
| 1028 | /* Fix the relocation's type. */ |
| 1029 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1030 | R_H8_DIR8); |
| 1031 | |
| 1032 | /* Delete two bytes of data. */ |
| 1033 | if (!elf32_h8_relax_delete_bytes (abfd, sec, |
| 1034 | irel->r_offset + 1, 2)) |
| 1035 | goto error_return; |
| 1036 | |
| 1037 | /* That will change things, so, we should relax again. |
| 1038 | Note that this is not required, and it may be slow. */ |
| 1039 | *again = true; |
| 1040 | } |
| 1041 | break; |
| 1042 | } |
| 1043 | |
| 1044 | /* This is a 24 bit absolute address in a "mov.b" insn, which may |
| 1045 | become an 8 bit absolute address if its in the right range. */ |
| 1046 | case R_H8_DIR24A8: |
| 1047 | { |
| 1048 | bfd_vma value = symval + irel->r_addend; |
| 1049 | |
| 1050 | if ((bfd_get_mach (abfd) == bfd_mach_h8300 |
| 1051 | && value >= 0xff00 |
| 1052 | && value <= 0xffff) |
| 1053 | || ((bfd_get_mach (abfd) == bfd_mach_h8300h |
| 1054 | || bfd_get_mach (abfd) == bfd_mach_h8300s) |
| 1055 | && value >= 0xffff00 |
| 1056 | && value <= 0xffffff)) |
| 1057 | { |
| 1058 | unsigned char code; |
| 1059 | |
| 1060 | /* Note that we've changed the relocs, section contents, |
| 1061 | etc. */ |
| 1062 | elf_section_data (sec)->relocs = internal_relocs; |
| 1063 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1064 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1065 | |
| 1066 | /* Get the opcode. */ |
| 1067 | code = bfd_get_8 (abfd, contents + irel->r_offset - 2); |
| 1068 | |
| 1069 | /* Sanity check. */ |
| 1070 | if (code != 0x6a) |
| 1071 | abort (); |
| 1072 | |
| 1073 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 1074 | |
| 1075 | if ((code & 0xf0) == 0x00) |
| 1076 | bfd_put_8 (abfd, |
| 1077 | (code & 0xf) | 0x20, |
| 1078 | contents + irel->r_offset - 2); |
| 1079 | else if ((code & 0xf0) == 0x80) |
| 1080 | bfd_put_8 (abfd, |
| 1081 | (code & 0xf) | 0x30, |
| 1082 | contents + irel->r_offset - 2); |
| 1083 | else |
| 1084 | abort (); |
| 1085 | |
| 1086 | /* Fix the relocation's type. */ |
| 1087 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1088 | R_H8_DIR8); |
| 1089 | |
| 1090 | /* Delete two bytes of data. */ |
| 1091 | if (!elf32_h8_relax_delete_bytes (abfd, sec, irel->r_offset, 2)) |
| 1092 | goto error_return; |
| 1093 | |
| 1094 | /* That will change things, so, we should relax again. |
| 1095 | Note that this is not required, and it may be slow. */ |
| 1096 | *again = true; |
| 1097 | } |
| 1098 | } |
| 1099 | |
| 1100 | /* FALLTHRU */ |
| 1101 | |
| 1102 | /* This is a 24/32bit absolute address in a "mov" insn, which may |
| 1103 | become a 16bit absoulte address if it is in the right range. */ |
| 1104 | case R_H8_DIR32A16: |
| 1105 | { |
| 1106 | bfd_vma value = symval + irel->r_addend; |
| 1107 | |
| 1108 | if (value <= 0x7fff || value >= 0xff8000) |
| 1109 | { |
| 1110 | unsigned char code; |
| 1111 | |
| 1112 | /* Note that we've changed the relocs, section contents, |
| 1113 | etc. */ |
| 1114 | elf_section_data (sec)->relocs = internal_relocs; |
| 1115 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1116 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1117 | |
| 1118 | /* Get the opcode. */ |
| 1119 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 1120 | |
| 1121 | /* We just need to turn off bit 0x20. */ |
| 1122 | code &= ~0x20; |
| 1123 | |
| 1124 | bfd_put_8 (abfd, code, contents + irel->r_offset - 1); |
| 1125 | |
| 1126 | /* Fix the relocation's type. */ |
| 1127 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1128 | R_H8_DIR16A8); |
| 1129 | |
| 1130 | /* Delete two bytes of data. */ |
| 1131 | if (!elf32_h8_relax_delete_bytes (abfd, sec, |
| 1132 | irel->r_offset + 1, 2)) |
| 1133 | goto error_return; |
| 1134 | |
| 1135 | /* That will change things, so, we should relax again. |
| 1136 | Note that this is not required, and it may be slow. */ |
| 1137 | *again = true; |
| 1138 | } |
| 1139 | break; |
| 1140 | } |
| 1141 | |
| 1142 | default: |
| 1143 | break; |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | if (isymbuf != NULL |
| 1148 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1149 | { |
| 1150 | if (! link_info->keep_memory) |
| 1151 | free (isymbuf); |
| 1152 | else |
| 1153 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1154 | } |
| 1155 | |
| 1156 | if (contents != NULL |
| 1157 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1158 | { |
| 1159 | if (! link_info->keep_memory) |
| 1160 | free (contents); |
| 1161 | else |
| 1162 | { |
| 1163 | /* Cache the section contents for elf_link_input_bfd. */ |
| 1164 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1165 | } |
| 1166 | } |
| 1167 | |
| 1168 | if (internal_relocs != NULL |
| 1169 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1170 | free (internal_relocs); |
| 1171 | |
| 1172 | return true; |
| 1173 | |
| 1174 | error_return: |
| 1175 | if (isymbuf != NULL |
| 1176 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1177 | free (isymbuf); |
| 1178 | if (contents != NULL |
| 1179 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1180 | free (contents); |
| 1181 | if (internal_relocs != NULL |
| 1182 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1183 | free (internal_relocs); |
| 1184 | return false; |
| 1185 | } |
| 1186 | |
| 1187 | /* Delete some bytes from a section while relaxing. */ |
| 1188 | |
| 1189 | static boolean |
| 1190 | elf32_h8_relax_delete_bytes (abfd, sec, addr, count) |
| 1191 | bfd *abfd; |
| 1192 | asection *sec; |
| 1193 | bfd_vma addr; |
| 1194 | int count; |
| 1195 | { |
| 1196 | Elf_Internal_Shdr *symtab_hdr; |
| 1197 | unsigned int sec_shndx; |
| 1198 | bfd_byte *contents; |
| 1199 | Elf_Internal_Rela *irel, *irelend; |
| 1200 | Elf_Internal_Rela *irelalign; |
| 1201 | Elf_Internal_Sym *isym; |
| 1202 | Elf_Internal_Sym *isymend; |
| 1203 | bfd_vma toaddr; |
| 1204 | struct elf_link_hash_entry **sym_hashes; |
| 1205 | struct elf_link_hash_entry **end_hashes; |
| 1206 | unsigned int symcount; |
| 1207 | |
| 1208 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 1209 | |
| 1210 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1211 | |
| 1212 | /* The deletion must stop at the next ALIGN reloc for an aligment |
| 1213 | power larger than the number of bytes we are deleting. */ |
| 1214 | |
| 1215 | irelalign = NULL; |
| 1216 | toaddr = sec->_cooked_size; |
| 1217 | |
| 1218 | irel = elf_section_data (sec)->relocs; |
| 1219 | irelend = irel + sec->reloc_count; |
| 1220 | |
| 1221 | /* Actually delete the bytes. */ |
| 1222 | memmove (contents + addr, contents + addr + count, |
| 1223 | (size_t) (toaddr - addr - count)); |
| 1224 | sec->_cooked_size -= count; |
| 1225 | |
| 1226 | /* Adjust all the relocs. */ |
| 1227 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| 1228 | { |
| 1229 | /* Get the new reloc address. */ |
| 1230 | if ((irel->r_offset > addr |
| 1231 | && irel->r_offset < toaddr)) |
| 1232 | irel->r_offset -= count; |
| 1233 | } |
| 1234 | |
| 1235 | /* Adjust the local symbols defined in this section. */ |
| 1236 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1237 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1238 | isymend = isym + symtab_hdr->sh_info; |
| 1239 | for (; isym < isymend; isym++) |
| 1240 | { |
| 1241 | if (isym->st_shndx == sec_shndx |
| 1242 | && isym->st_value > addr |
| 1243 | && isym->st_value < toaddr) |
| 1244 | isym->st_value -= count; |
| 1245 | } |
| 1246 | |
| 1247 | /* Now adjust the global symbols defined in this section. */ |
| 1248 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 1249 | - symtab_hdr->sh_info); |
| 1250 | sym_hashes = elf_sym_hashes (abfd); |
| 1251 | end_hashes = sym_hashes + symcount; |
| 1252 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 1253 | { |
| 1254 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 1255 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 1256 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 1257 | && sym_hash->root.u.def.section == sec |
| 1258 | && sym_hash->root.u.def.value > addr |
| 1259 | && sym_hash->root.u.def.value < toaddr) |
| 1260 | { |
| 1261 | sym_hash->root.u.def.value -= count; |
| 1262 | } |
| 1263 | } |
| 1264 | |
| 1265 | return true; |
| 1266 | } |
| 1267 | |
| 1268 | /* Return true if a symbol exists at the given address, else return |
| 1269 | false. */ |
| 1270 | static boolean |
| 1271 | elf32_h8_symbol_address_p (abfd, sec, addr) |
| 1272 | bfd *abfd; |
| 1273 | asection *sec; |
| 1274 | bfd_vma addr; |
| 1275 | { |
| 1276 | Elf_Internal_Shdr *symtab_hdr; |
| 1277 | unsigned int sec_shndx; |
| 1278 | Elf_Internal_Sym *isym; |
| 1279 | Elf_Internal_Sym *isymend; |
| 1280 | struct elf_link_hash_entry **sym_hashes; |
| 1281 | struct elf_link_hash_entry **end_hashes; |
| 1282 | unsigned int symcount; |
| 1283 | |
| 1284 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 1285 | |
| 1286 | /* Examine all the symbols. */ |
| 1287 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1288 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1289 | isymend = isym + symtab_hdr->sh_info; |
| 1290 | for (; isym < isymend; isym++) |
| 1291 | { |
| 1292 | if (isym->st_shndx == sec_shndx |
| 1293 | && isym->st_value == addr) |
| 1294 | return true; |
| 1295 | } |
| 1296 | |
| 1297 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 1298 | - symtab_hdr->sh_info); |
| 1299 | sym_hashes = elf_sym_hashes (abfd); |
| 1300 | end_hashes = sym_hashes + symcount; |
| 1301 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 1302 | { |
| 1303 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 1304 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 1305 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 1306 | && sym_hash->root.u.def.section == sec |
| 1307 | && sym_hash->root.u.def.value == addr) |
| 1308 | return true; |
| 1309 | } |
| 1310 | |
| 1311 | return false; |
| 1312 | } |
| 1313 | |
| 1314 | /* This is a version of bfd_generic_get_relocated_section_contents |
| 1315 | which uses elf32_h8_relocate_section. */ |
| 1316 | |
| 1317 | static bfd_byte * |
| 1318 | elf32_h8_get_relocated_section_contents (output_bfd, link_info, link_order, |
| 1319 | data, relocateable, symbols) |
| 1320 | bfd *output_bfd; |
| 1321 | struct bfd_link_info *link_info; |
| 1322 | struct bfd_link_order *link_order; |
| 1323 | bfd_byte *data; |
| 1324 | boolean relocateable; |
| 1325 | asymbol **symbols; |
| 1326 | { |
| 1327 | Elf_Internal_Shdr *symtab_hdr; |
| 1328 | asection *input_section = link_order->u.indirect.section; |
| 1329 | bfd *input_bfd = input_section->owner; |
| 1330 | asection **sections = NULL; |
| 1331 | Elf_Internal_Rela *internal_relocs = NULL; |
| 1332 | Elf_Internal_Sym *isymbuf = NULL; |
| 1333 | |
| 1334 | /* We only need to handle the case of relaxing, or of having a |
| 1335 | particular set of section contents, specially. */ |
| 1336 | if (relocateable |
| 1337 | || elf_section_data (input_section)->this_hdr.contents == NULL) |
| 1338 | return bfd_generic_get_relocated_section_contents (output_bfd, link_info, |
| 1339 | link_order, data, |
| 1340 | relocateable, |
| 1341 | symbols); |
| 1342 | |
| 1343 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1344 | |
| 1345 | memcpy (data, elf_section_data (input_section)->this_hdr.contents, |
| 1346 | (size_t) input_section->_raw_size); |
| 1347 | |
| 1348 | if ((input_section->flags & SEC_RELOC) != 0 |
| 1349 | && input_section->reloc_count > 0) |
| 1350 | { |
| 1351 | asection **secpp; |
| 1352 | Elf_Internal_Sym *isym, *isymend; |
| 1353 | bfd_size_type amt; |
| 1354 | |
| 1355 | internal_relocs = (_bfd_elf32_link_read_relocs |
| 1356 | (input_bfd, input_section, (PTR) NULL, |
| 1357 | (Elf_Internal_Rela *) NULL, false)); |
| 1358 | if (internal_relocs == NULL) |
| 1359 | goto error_return; |
| 1360 | |
| 1361 | if (symtab_hdr->sh_info != 0) |
| 1362 | { |
| 1363 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1364 | if (isymbuf == NULL) |
| 1365 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, |
| 1366 | symtab_hdr->sh_info, 0, |
| 1367 | NULL, NULL, NULL); |
| 1368 | if (isymbuf == NULL) |
| 1369 | goto error_return; |
| 1370 | } |
| 1371 | |
| 1372 | amt = symtab_hdr->sh_info; |
| 1373 | amt *= sizeof (asection *); |
| 1374 | sections = (asection **) bfd_malloc (amt); |
| 1375 | if (sections == NULL && amt != 0) |
| 1376 | goto error_return; |
| 1377 | |
| 1378 | isymend = isymbuf + symtab_hdr->sh_info; |
| 1379 | for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) |
| 1380 | { |
| 1381 | asection *isec; |
| 1382 | |
| 1383 | if (isym->st_shndx == SHN_UNDEF) |
| 1384 | isec = bfd_und_section_ptr; |
| 1385 | else if (isym->st_shndx == SHN_ABS) |
| 1386 | isec = bfd_abs_section_ptr; |
| 1387 | else if (isym->st_shndx == SHN_COMMON) |
| 1388 | isec = bfd_com_section_ptr; |
| 1389 | else |
| 1390 | isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); |
| 1391 | |
| 1392 | *secpp = isec; |
| 1393 | } |
| 1394 | |
| 1395 | if (! elf32_h8_relocate_section (output_bfd, link_info, input_bfd, |
| 1396 | input_section, data, internal_relocs, |
| 1397 | isymbuf, sections)) |
| 1398 | goto error_return; |
| 1399 | |
| 1400 | if (sections != NULL) |
| 1401 | free (sections); |
| 1402 | if (isymbuf != NULL |
| 1403 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1404 | free (isymbuf); |
| 1405 | if (elf_section_data (input_section)->relocs != internal_relocs) |
| 1406 | free (internal_relocs); |
| 1407 | } |
| 1408 | |
| 1409 | return data; |
| 1410 | |
| 1411 | error_return: |
| 1412 | if (sections != NULL) |
| 1413 | free (sections); |
| 1414 | if (isymbuf != NULL |
| 1415 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1416 | free (isymbuf); |
| 1417 | if (internal_relocs != NULL |
| 1418 | && elf_section_data (input_section)->relocs != internal_relocs) |
| 1419 | free (internal_relocs); |
| 1420 | return NULL; |
| 1421 | } |
| 1422 | |
| 1423 | |
| 1424 | #define TARGET_BIG_SYM bfd_elf32_h8300_vec |
| 1425 | #define TARGET_BIG_NAME "elf32-h8300" |
| 1426 | #define ELF_ARCH bfd_arch_h8300 |
| 1427 | #define ELF_MACHINE_CODE EM_H8_300 |
| 1428 | #define ELF_MAXPAGESIZE 0x1 |
| 1429 | #define bfd_elf32_bfd_reloc_type_lookup elf32_h8_reloc_type_lookup |
| 1430 | #define elf_info_to_howto elf32_h8_info_to_howto |
| 1431 | #define elf_info_to_howto_rel elf32_h8_info_to_howto_rel |
| 1432 | |
| 1433 | /* So we can set/examine bits in e_flags to get the specific |
| 1434 | H8 architecture in use. */ |
| 1435 | #define elf_backend_final_write_processing \ |
| 1436 | elf32_h8_final_write_processing |
| 1437 | #define elf_backend_object_p \ |
| 1438 | elf32_h8_object_p |
| 1439 | #define bfd_elf32_bfd_merge_private_bfd_data \ |
| 1440 | elf32_h8_merge_private_bfd_data |
| 1441 | |
| 1442 | /* ??? when elf_backend_relocate_section is not defined, elf32-target.h |
| 1443 | defaults to using _bfd_generic_link_hash_table_create, but |
| 1444 | elflink.h:bfd_elf32_size_dynamic_sections uses |
| 1445 | dynobj = elf_hash_table (info)->dynobj; |
| 1446 | and thus requires an elf hash table. */ |
| 1447 | #define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create |
| 1448 | |
| 1449 | /* Use an H8 specific linker, not the ELF generic linker. */ |
| 1450 | #define elf_backend_relocate_section elf32_h8_relocate_section |
| 1451 | #define elf_backend_rela_normal 1 |
| 1452 | |
| 1453 | /* And relaxing stuff. */ |
| 1454 | #define bfd_elf32_bfd_relax_section elf32_h8_relax_section |
| 1455 | #define bfd_elf32_bfd_get_relocated_section_contents \ |
| 1456 | elf32_h8_get_relocated_section_contents |
| 1457 | |
| 1458 | |
| 1459 | #include "elf32-target.h" |