| 1 | /* BFD back-end for Renesas H8/300 ELF binaries. |
| 2 | Copyright 1993, 1995, 1998, 1999, 2001, 2002, 2003 |
| 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 | (bfd *abfd, bfd_reloc_code_real_type code); |
| 29 | static void elf32_h8_info_to_howto |
| 30 | (bfd *, arelent *, Elf_Internal_Rela *); |
| 31 | static void elf32_h8_info_to_howto_rel |
| 32 | (bfd *, arelent *, Elf_Internal_Rela *); |
| 33 | static unsigned long elf32_h8_mach |
| 34 | (flagword); |
| 35 | static void elf32_h8_final_write_processing |
| 36 | (bfd *, bfd_boolean); |
| 37 | static bfd_boolean elf32_h8_object_p |
| 38 | (bfd *); |
| 39 | static bfd_boolean elf32_h8_merge_private_bfd_data |
| 40 | (bfd *, bfd *); |
| 41 | static bfd_boolean elf32_h8_relax_section |
| 42 | (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); |
| 43 | static bfd_boolean elf32_h8_relax_delete_bytes |
| 44 | (bfd *, asection *, bfd_vma, int); |
| 45 | static bfd_boolean elf32_h8_symbol_address_p |
| 46 | (bfd *, asection *, bfd_vma); |
| 47 | static bfd_byte *elf32_h8_get_relocated_section_contents |
| 48 | (bfd *, struct bfd_link_info *, struct bfd_link_order *, |
| 49 | bfd_byte *, bfd_boolean, asymbol **); |
| 50 | static bfd_reloc_status_type elf32_h8_final_link_relocate |
| 51 | (unsigned long, bfd *, bfd *, asection *, |
| 52 | bfd_byte *, bfd_vma, bfd_vma, bfd_vma, |
| 53 | struct bfd_link_info *, asection *, int); |
| 54 | static bfd_boolean elf32_h8_relocate_section |
| 55 | (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 | (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 | #define R_H8_NONE_X 0 |
| 66 | HOWTO (R_H8_NONE, /* type */ |
| 67 | 0, /* rightshift */ |
| 68 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 69 | 0, /* bitsize */ |
| 70 | FALSE, /* pc_relative */ |
| 71 | 0, /* bitpos */ |
| 72 | complain_overflow_dont,/* complain_on_overflow */ |
| 73 | special, /* special_function */ |
| 74 | "R_H8_NONE", /* name */ |
| 75 | FALSE, /* partial_inplace */ |
| 76 | 0, /* src_mask */ |
| 77 | 0, /* dst_mask */ |
| 78 | FALSE), /* pcrel_offset */ |
| 79 | #define R_H8_DIR32_X (R_H8_NONE_X + 1) |
| 80 | HOWTO (R_H8_DIR32, /* type */ |
| 81 | 0, /* rightshift */ |
| 82 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 83 | 32, /* bitsize */ |
| 84 | FALSE, /* pc_relative */ |
| 85 | 0, /* bitpos */ |
| 86 | complain_overflow_dont,/* complain_on_overflow */ |
| 87 | special, /* special_function */ |
| 88 | "R_H8_DIR32", /* name */ |
| 89 | FALSE, /* partial_inplace */ |
| 90 | 0, /* src_mask */ |
| 91 | 0xffffffff, /* dst_mask */ |
| 92 | FALSE), /* pcrel_offset */ |
| 93 | #define R_H8_DIR16_X (R_H8_DIR32_X + 1) |
| 94 | HOWTO (R_H8_DIR16, /* type */ |
| 95 | 0, /* rightshift */ |
| 96 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 97 | 16, /* bitsize */ |
| 98 | FALSE, /* pc_relative */ |
| 99 | 0, /* bitpos */ |
| 100 | complain_overflow_dont,/* complain_on_overflow */ |
| 101 | special, /* special_function */ |
| 102 | "R_H8_DIR16", /* name */ |
| 103 | FALSE, /* partial_inplace */ |
| 104 | 0, /* src_mask */ |
| 105 | 0x0000ffff, /* dst_mask */ |
| 106 | FALSE), /* pcrel_offset */ |
| 107 | #define R_H8_DIR8_X (R_H8_DIR16_X + 1) |
| 108 | HOWTO (R_H8_DIR8, /* type */ |
| 109 | 0, /* rightshift */ |
| 110 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 111 | 8, /* bitsize */ |
| 112 | FALSE, /* pc_relative */ |
| 113 | 0, /* bitpos */ |
| 114 | complain_overflow_dont,/* complain_on_overflow */ |
| 115 | special, /* special_function */ |
| 116 | "R_H8_DIR8", /* name */ |
| 117 | FALSE, /* partial_inplace */ |
| 118 | 0, /* src_mask */ |
| 119 | 0x000000ff, /* dst_mask */ |
| 120 | FALSE), /* pcrel_offset */ |
| 121 | #define R_H8_DIR16A8_X (R_H8_DIR8_X + 1) |
| 122 | HOWTO (R_H8_DIR16A8, /* type */ |
| 123 | 0, /* rightshift */ |
| 124 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 125 | 16, /* bitsize */ |
| 126 | FALSE, /* pc_relative */ |
| 127 | 0, /* bitpos */ |
| 128 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 129 | special, /* special_function */ |
| 130 | "R_H8_DIR16A8", /* name */ |
| 131 | FALSE, /* partial_inplace */ |
| 132 | 0, /* src_mask */ |
| 133 | 0x0000ffff, /* dst_mask */ |
| 134 | FALSE), /* pcrel_offset */ |
| 135 | #define R_H8_DIR16R8_X (R_H8_DIR16A8_X + 1) |
| 136 | HOWTO (R_H8_DIR16R8, /* type */ |
| 137 | 0, /* rightshift */ |
| 138 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 139 | 16, /* bitsize */ |
| 140 | FALSE, /* pc_relative */ |
| 141 | 0, /* bitpos */ |
| 142 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 143 | special, /* special_function */ |
| 144 | "R_H8_DIR16R8", /* name */ |
| 145 | FALSE, /* partial_inplace */ |
| 146 | 0, /* src_mask */ |
| 147 | 0x0000ffff, /* dst_mask */ |
| 148 | FALSE), /* pcrel_offset */ |
| 149 | #define R_H8_DIR24A8_X (R_H8_DIR16R8_X + 1) |
| 150 | HOWTO (R_H8_DIR24A8, /* type */ |
| 151 | 0, /* rightshift */ |
| 152 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 153 | 24, /* bitsize */ |
| 154 | FALSE, /* pc_relative */ |
| 155 | 0, /* bitpos */ |
| 156 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 157 | special, /* special_function */ |
| 158 | "R_H8_DIR24A8", /* name */ |
| 159 | TRUE, /* partial_inplace */ |
| 160 | 0xff000000, /* src_mask */ |
| 161 | 0x00ffffff, /* dst_mask */ |
| 162 | FALSE), /* pcrel_offset */ |
| 163 | #define R_H8_DIR24R8_X (R_H8_DIR24A8_X + 1) |
| 164 | HOWTO (R_H8_DIR24R8, /* type */ |
| 165 | 0, /* rightshift */ |
| 166 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 167 | 24, /* bitsize */ |
| 168 | FALSE, /* pc_relative */ |
| 169 | 0, /* bitpos */ |
| 170 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 171 | special, /* special_function */ |
| 172 | "R_H8_DIR24R8", /* name */ |
| 173 | TRUE, /* partial_inplace */ |
| 174 | 0xff000000, /* src_mask */ |
| 175 | 0x00ffffff, /* dst_mask */ |
| 176 | FALSE), /* pcrel_offset */ |
| 177 | #define R_H8_DIR32A16_X (R_H8_DIR24R8_X + 1) |
| 178 | HOWTO (R_H8_DIR32A16, /* type */ |
| 179 | 0, /* rightshift */ |
| 180 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 181 | 32, /* bitsize */ |
| 182 | FALSE, /* pc_relative */ |
| 183 | 0, /* bitpos */ |
| 184 | complain_overflow_dont,/* complain_on_overflow */ |
| 185 | special, /* special_function */ |
| 186 | "R_H8_DIR32A16", /* name */ |
| 187 | FALSE, /* partial_inplace */ |
| 188 | 0, /* src_mask */ |
| 189 | 0xffffffff, /* dst_mask */ |
| 190 | FALSE), /* pcrel_offset */ |
| 191 | #define R_H8_PCREL16_X (R_H8_DIR32A16_X + 1) |
| 192 | HOWTO (R_H8_PCREL16, /* type */ |
| 193 | 0, /* rightshift */ |
| 194 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 195 | 16, /* bitsize */ |
| 196 | TRUE, /* pc_relative */ |
| 197 | 0, /* bitpos */ |
| 198 | complain_overflow_signed,/* complain_on_overflow */ |
| 199 | special, /* special_function */ |
| 200 | "R_H8_PCREL16", /* name */ |
| 201 | FALSE, /* partial_inplace */ |
| 202 | 0xffff, /* src_mask */ |
| 203 | 0xffff, /* dst_mask */ |
| 204 | TRUE), /* pcrel_offset */ |
| 205 | #define R_H8_PCREL8_X (R_H8_PCREL16_X + 1) |
| 206 | HOWTO (R_H8_PCREL8, /* type */ |
| 207 | 0, /* rightshift */ |
| 208 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 209 | 8, /* bitsize */ |
| 210 | TRUE, /* pc_relative */ |
| 211 | 0, /* bitpos */ |
| 212 | complain_overflow_signed,/* complain_on_overflow */ |
| 213 | special, /* special_function */ |
| 214 | "R_H8_PCREL8", /* name */ |
| 215 | FALSE, /* partial_inplace */ |
| 216 | 0xff, /* src_mask */ |
| 217 | 0xff, /* dst_mask */ |
| 218 | TRUE), /* pcrel_offset */ |
| 219 | }; |
| 220 | |
| 221 | /* This structure is used to map BFD reloc codes to H8 ELF relocs. */ |
| 222 | |
| 223 | struct elf_reloc_map { |
| 224 | bfd_reloc_code_real_type bfd_reloc_val; |
| 225 | unsigned char howto_index; |
| 226 | }; |
| 227 | |
| 228 | /* An array mapping BFD reloc codes to H8 ELF relocs. */ |
| 229 | |
| 230 | static const struct elf_reloc_map h8_reloc_map[] = { |
| 231 | { BFD_RELOC_NONE, R_H8_NONE_X }, |
| 232 | { BFD_RELOC_32, R_H8_DIR32_X }, |
| 233 | { BFD_RELOC_16, R_H8_DIR16_X }, |
| 234 | { BFD_RELOC_8, R_H8_DIR8_X }, |
| 235 | { BFD_RELOC_H8_DIR16A8, R_H8_DIR16A8_X }, |
| 236 | { BFD_RELOC_H8_DIR16R8, R_H8_DIR16R8_X }, |
| 237 | { BFD_RELOC_H8_DIR24A8, R_H8_DIR24A8_X }, |
| 238 | { BFD_RELOC_H8_DIR24R8, R_H8_DIR24R8_X }, |
| 239 | { BFD_RELOC_H8_DIR32A16, R_H8_DIR32A16_X }, |
| 240 | { BFD_RELOC_16_PCREL, R_H8_PCREL16_X }, |
| 241 | { BFD_RELOC_8_PCREL, R_H8_PCREL8_X }, |
| 242 | }; |
| 243 | |
| 244 | |
| 245 | static reloc_howto_type * |
| 246 | elf32_h8_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 247 | bfd_reloc_code_real_type code) |
| 248 | { |
| 249 | unsigned int i; |
| 250 | |
| 251 | for (i = 0; i < sizeof (h8_reloc_map) / sizeof (struct elf_reloc_map); i++) |
| 252 | { |
| 253 | if (h8_reloc_map[i].bfd_reloc_val == code) |
| 254 | return &h8_elf_howto_table[(int) h8_reloc_map[i].howto_index]; |
| 255 | } |
| 256 | return NULL; |
| 257 | } |
| 258 | |
| 259 | static void |
| 260 | elf32_h8_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc, |
| 261 | Elf_Internal_Rela *elf_reloc) |
| 262 | { |
| 263 | unsigned int r; |
| 264 | unsigned int i; |
| 265 | |
| 266 | r = ELF32_R_TYPE (elf_reloc->r_info); |
| 267 | for (i = 0; i < sizeof (h8_elf_howto_table) / sizeof (reloc_howto_type); i++) |
| 268 | if (h8_elf_howto_table[i].type == r) |
| 269 | { |
| 270 | bfd_reloc->howto = &h8_elf_howto_table[i]; |
| 271 | return; |
| 272 | } |
| 273 | abort (); |
| 274 | } |
| 275 | |
| 276 | static void |
| 277 | elf32_h8_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc, |
| 278 | Elf_Internal_Rela *elf_reloc ATTRIBUTE_UNUSED) |
| 279 | { |
| 280 | unsigned int r; |
| 281 | |
| 282 | abort (); |
| 283 | r = ELF32_R_TYPE (elf_reloc->r_info); |
| 284 | bfd_reloc->howto = &h8_elf_howto_table[r]; |
| 285 | } |
| 286 | |
| 287 | /* Special handling for H8/300 relocs. |
| 288 | We only come here for pcrel stuff and return normally if not an -r link. |
| 289 | When doing -r, we can't do any arithmetic for the pcrel stuff, because |
| 290 | we support relaxing on the H8/300 series chips. */ |
| 291 | static bfd_reloc_status_type |
| 292 | special (bfd *abfd ATTRIBUTE_UNUSED, |
| 293 | arelent *reloc_entry ATTRIBUTE_UNUSED, |
| 294 | asymbol *symbol ATTRIBUTE_UNUSED, |
| 295 | PTR data ATTRIBUTE_UNUSED, |
| 296 | asection *input_section ATTRIBUTE_UNUSED, |
| 297 | bfd *output_bfd, |
| 298 | char **error_message ATTRIBUTE_UNUSED) |
| 299 | { |
| 300 | if (output_bfd == (bfd *) NULL) |
| 301 | return bfd_reloc_continue; |
| 302 | |
| 303 | /* Adjust the reloc address to that in the output section. */ |
| 304 | reloc_entry->address += input_section->output_offset; |
| 305 | return bfd_reloc_ok; |
| 306 | } |
| 307 | |
| 308 | /* Perform a relocation as part of a final link. */ |
| 309 | static bfd_reloc_status_type |
| 310 | elf32_h8_final_link_relocate (unsigned long r_type, bfd *input_bfd, |
| 311 | bfd *output_bfd ATTRIBUTE_UNUSED, |
| 312 | asection *input_section ATTRIBUTE_UNUSED, |
| 313 | bfd_byte *contents, bfd_vma offset, |
| 314 | bfd_vma value, bfd_vma addend, |
| 315 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 316 | asection *sym_sec ATTRIBUTE_UNUSED, |
| 317 | int is_local ATTRIBUTE_UNUSED) |
| 318 | { |
| 319 | bfd_byte *hit_data = contents + offset; |
| 320 | |
| 321 | switch (r_type) |
| 322 | { |
| 323 | case R_H8_NONE: |
| 324 | return bfd_reloc_ok; |
| 325 | |
| 326 | case R_H8_DIR32: |
| 327 | case R_H8_DIR32A16: |
| 328 | case R_H8_DIR24A8: |
| 329 | value += addend; |
| 330 | bfd_put_32 (input_bfd, value, hit_data); |
| 331 | return bfd_reloc_ok; |
| 332 | |
| 333 | case R_H8_DIR16: |
| 334 | case R_H8_DIR16A8: |
| 335 | case R_H8_DIR16R8: |
| 336 | value += addend; |
| 337 | bfd_put_16 (input_bfd, value, hit_data); |
| 338 | return bfd_reloc_ok; |
| 339 | |
| 340 | /* AKA R_RELBYTE */ |
| 341 | case R_H8_DIR8: |
| 342 | value += addend; |
| 343 | |
| 344 | bfd_put_8 (input_bfd, value, hit_data); |
| 345 | return bfd_reloc_ok; |
| 346 | |
| 347 | case R_H8_DIR24R8: |
| 348 | value += addend; |
| 349 | |
| 350 | /* HIT_DATA is the address for the first byte for the relocated |
| 351 | value. Subtract 1 so that we can manipulate the data in 32bit |
| 352 | hunks. */ |
| 353 | hit_data--; |
| 354 | |
| 355 | /* Clear out the top byte in value. */ |
| 356 | value &= 0xffffff; |
| 357 | |
| 358 | /* Retrieve the type byte for value from the section contents. */ |
| 359 | value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000); |
| 360 | |
| 361 | /* Now scribble it out in one 32bit hunk. */ |
| 362 | bfd_put_32 (input_bfd, value, hit_data); |
| 363 | return bfd_reloc_ok; |
| 364 | |
| 365 | case R_H8_PCREL16: |
| 366 | value -= (input_section->output_section->vma |
| 367 | + input_section->output_offset); |
| 368 | value -= offset; |
| 369 | value += addend; |
| 370 | |
| 371 | /* The value is relative to the start of the instruction, |
| 372 | not the relocation offset. Subtract 2 to account for |
| 373 | this minor issue. */ |
| 374 | value -= 2; |
| 375 | |
| 376 | bfd_put_16 (input_bfd, value, hit_data); |
| 377 | return bfd_reloc_ok; |
| 378 | |
| 379 | case R_H8_PCREL8: |
| 380 | value -= (input_section->output_section->vma |
| 381 | + input_section->output_offset); |
| 382 | value -= offset; |
| 383 | value += addend; |
| 384 | |
| 385 | /* The value is relative to the start of the instruction, |
| 386 | not the relocation offset. Subtract 1 to account for |
| 387 | this minor issue. */ |
| 388 | value -= 1; |
| 389 | |
| 390 | bfd_put_8 (input_bfd, value, hit_data); |
| 391 | return bfd_reloc_ok; |
| 392 | |
| 393 | default: |
| 394 | return bfd_reloc_notsupported; |
| 395 | } |
| 396 | } |
| 397 | \f |
| 398 | /* Relocate an H8 ELF section. */ |
| 399 | static bfd_boolean |
| 400 | elf32_h8_relocate_section (bfd *output_bfd, struct bfd_link_info *info, |
| 401 | bfd *input_bfd, asection *input_section, |
| 402 | bfd_byte *contents, Elf_Internal_Rela *relocs, |
| 403 | Elf_Internal_Sym *local_syms, |
| 404 | asection **local_sections) |
| 405 | { |
| 406 | Elf_Internal_Shdr *symtab_hdr; |
| 407 | struct elf_link_hash_entry **sym_hashes; |
| 408 | Elf_Internal_Rela *rel, *relend; |
| 409 | |
| 410 | if (info->relocatable) |
| 411 | return TRUE; |
| 412 | |
| 413 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 414 | sym_hashes = elf_sym_hashes (input_bfd); |
| 415 | |
| 416 | rel = relocs; |
| 417 | relend = relocs + input_section->reloc_count; |
| 418 | for (; rel < relend; rel++) |
| 419 | { |
| 420 | unsigned int r_type; |
| 421 | unsigned long r_symndx; |
| 422 | Elf_Internal_Sym *sym; |
| 423 | asection *sec; |
| 424 | struct elf_link_hash_entry *h; |
| 425 | bfd_vma relocation; |
| 426 | bfd_reloc_status_type r; |
| 427 | |
| 428 | /* This is a final link. */ |
| 429 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 430 | r_type = ELF32_R_TYPE (rel->r_info); |
| 431 | h = NULL; |
| 432 | sym = NULL; |
| 433 | sec = NULL; |
| 434 | if (r_symndx < symtab_hdr->sh_info) |
| 435 | { |
| 436 | sym = local_syms + r_symndx; |
| 437 | sec = local_sections[r_symndx]; |
| 438 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 439 | } |
| 440 | else |
| 441 | { |
| 442 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 443 | while (h->root.type == bfd_link_hash_indirect |
| 444 | || h->root.type == bfd_link_hash_warning) |
| 445 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 446 | if (h->root.type == bfd_link_hash_defined |
| 447 | || h->root.type == bfd_link_hash_defweak) |
| 448 | { |
| 449 | sec = h->root.u.def.section; |
| 450 | relocation = (h->root.u.def.value |
| 451 | + sec->output_section->vma |
| 452 | + sec->output_offset); |
| 453 | } |
| 454 | else if (h->root.type == bfd_link_hash_undefweak) |
| 455 | relocation = 0; |
| 456 | else |
| 457 | { |
| 458 | if (! ((*info->callbacks->undefined_symbol) |
| 459 | (info, h->root.root.string, input_bfd, |
| 460 | input_section, rel->r_offset, TRUE))) |
| 461 | return FALSE; |
| 462 | relocation = 0; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | r = elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd, |
| 467 | input_section, |
| 468 | contents, rel->r_offset, |
| 469 | relocation, rel->r_addend, |
| 470 | info, sec, h == NULL); |
| 471 | |
| 472 | if (r != bfd_reloc_ok) |
| 473 | { |
| 474 | const char *name; |
| 475 | const char *msg = (const char *) 0; |
| 476 | arelent bfd_reloc; |
| 477 | reloc_howto_type *howto; |
| 478 | |
| 479 | elf32_h8_info_to_howto (input_bfd, &bfd_reloc, rel); |
| 480 | howto = bfd_reloc.howto; |
| 481 | |
| 482 | if (h != NULL) |
| 483 | name = h->root.root.string; |
| 484 | else |
| 485 | { |
| 486 | name = (bfd_elf_string_from_elf_section |
| 487 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); |
| 488 | if (name == NULL || *name == '\0') |
| 489 | name = bfd_section_name (input_bfd, sec); |
| 490 | } |
| 491 | |
| 492 | switch (r) |
| 493 | { |
| 494 | case bfd_reloc_overflow: |
| 495 | if (! ((*info->callbacks->reloc_overflow) |
| 496 | (info, name, howto->name, (bfd_vma) 0, |
| 497 | input_bfd, input_section, rel->r_offset))) |
| 498 | return FALSE; |
| 499 | break; |
| 500 | |
| 501 | case bfd_reloc_undefined: |
| 502 | if (! ((*info->callbacks->undefined_symbol) |
| 503 | (info, name, input_bfd, input_section, |
| 504 | rel->r_offset, TRUE))) |
| 505 | return FALSE; |
| 506 | break; |
| 507 | |
| 508 | case bfd_reloc_outofrange: |
| 509 | msg = _("internal error: out of range error"); |
| 510 | goto common_error; |
| 511 | |
| 512 | case bfd_reloc_notsupported: |
| 513 | msg = _("internal error: unsupported relocation error"); |
| 514 | goto common_error; |
| 515 | |
| 516 | case bfd_reloc_dangerous: |
| 517 | msg = _("internal error: dangerous error"); |
| 518 | goto common_error; |
| 519 | |
| 520 | default: |
| 521 | msg = _("internal error: unknown error"); |
| 522 | /* fall through */ |
| 523 | |
| 524 | common_error: |
| 525 | if (!((*info->callbacks->warning) |
| 526 | (info, msg, name, input_bfd, input_section, |
| 527 | rel->r_offset))) |
| 528 | return FALSE; |
| 529 | break; |
| 530 | } |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | return TRUE; |
| 535 | } |
| 536 | |
| 537 | /* Object files encode the specific H8 model they were compiled |
| 538 | for in the ELF flags field. |
| 539 | |
| 540 | Examine that field and return the proper BFD machine type for |
| 541 | the object file. */ |
| 542 | static unsigned long |
| 543 | elf32_h8_mach (flagword flags) |
| 544 | { |
| 545 | switch (flags & EF_H8_MACH) |
| 546 | { |
| 547 | case E_H8_MACH_H8300: |
| 548 | default: |
| 549 | return bfd_mach_h8300; |
| 550 | |
| 551 | case E_H8_MACH_H8300H: |
| 552 | return bfd_mach_h8300h; |
| 553 | |
| 554 | case E_H8_MACH_H8300S: |
| 555 | return bfd_mach_h8300s; |
| 556 | |
| 557 | case E_H8_MACH_H8300HN: |
| 558 | return bfd_mach_h8300hn; |
| 559 | |
| 560 | case E_H8_MACH_H8300SN: |
| 561 | return bfd_mach_h8300sn; |
| 562 | |
| 563 | case E_H8_MACH_H8300SX: |
| 564 | return bfd_mach_h8300sx; |
| 565 | |
| 566 | case E_H8_MACH_H8300SXN: |
| 567 | return bfd_mach_h8300sxn; |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | /* The final processing done just before writing out a H8 ELF object |
| 572 | file. We use this opportunity to encode the BFD machine type |
| 573 | into the flags field in the object file. */ |
| 574 | |
| 575 | static void |
| 576 | elf32_h8_final_write_processing (bfd *abfd, |
| 577 | bfd_boolean linker ATTRIBUTE_UNUSED) |
| 578 | { |
| 579 | unsigned long val; |
| 580 | |
| 581 | switch (bfd_get_mach (abfd)) |
| 582 | { |
| 583 | default: |
| 584 | case bfd_mach_h8300: |
| 585 | val = E_H8_MACH_H8300; |
| 586 | break; |
| 587 | |
| 588 | case bfd_mach_h8300h: |
| 589 | val = E_H8_MACH_H8300H; |
| 590 | break; |
| 591 | |
| 592 | case bfd_mach_h8300s: |
| 593 | val = E_H8_MACH_H8300S; |
| 594 | break; |
| 595 | |
| 596 | case bfd_mach_h8300hn: |
| 597 | val = E_H8_MACH_H8300HN; |
| 598 | break; |
| 599 | |
| 600 | case bfd_mach_h8300sn: |
| 601 | val = E_H8_MACH_H8300SN; |
| 602 | break; |
| 603 | |
| 604 | case bfd_mach_h8300sx: |
| 605 | val = E_H8_MACH_H8300SX; |
| 606 | break; |
| 607 | |
| 608 | case bfd_mach_h8300sxn: |
| 609 | val = E_H8_MACH_H8300SXN; |
| 610 | break; |
| 611 | } |
| 612 | |
| 613 | elf_elfheader (abfd)->e_flags &= ~ (EF_H8_MACH); |
| 614 | elf_elfheader (abfd)->e_flags |= val; |
| 615 | } |
| 616 | |
| 617 | /* Return nonzero if ABFD represents a valid H8 ELF object file; also |
| 618 | record the encoded machine type found in the ELF flags. */ |
| 619 | |
| 620 | static bfd_boolean |
| 621 | elf32_h8_object_p (bfd *abfd) |
| 622 | { |
| 623 | bfd_default_set_arch_mach (abfd, bfd_arch_h8300, |
| 624 | elf32_h8_mach (elf_elfheader (abfd)->e_flags)); |
| 625 | return TRUE; |
| 626 | } |
| 627 | |
| 628 | /* Merge backend specific data from an object file to the output |
| 629 | object file when linking. The only data we need to copy at this |
| 630 | time is the architecture/machine information. */ |
| 631 | |
| 632 | static bfd_boolean |
| 633 | elf32_h8_merge_private_bfd_data (bfd *ibfd, bfd *obfd) |
| 634 | { |
| 635 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 636 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 637 | return TRUE; |
| 638 | |
| 639 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) |
| 640 | && bfd_get_mach (obfd) < bfd_get_mach (ibfd)) |
| 641 | { |
| 642 | if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), |
| 643 | bfd_get_mach (ibfd))) |
| 644 | return FALSE; |
| 645 | } |
| 646 | |
| 647 | return TRUE; |
| 648 | } |
| 649 | |
| 650 | /* This function handles relaxing for the H8.. |
| 651 | |
| 652 | There's a few relaxing opportunites available on the H8: |
| 653 | |
| 654 | jmp/jsr:24 -> bra/bsr:8 2 bytes |
| 655 | The jmp may be completely eliminated if the previous insn is a |
| 656 | conditional branch to the insn after the jump. In that case |
| 657 | we invert the branch and delete the jump and save 4 bytes. |
| 658 | |
| 659 | bCC:16 -> bCC:8 2 bytes |
| 660 | bsr:16 -> bsr:8 2 bytes |
| 661 | |
| 662 | mov.b:16 -> mov.b:8 2 bytes |
| 663 | mov.b:24/32 -> mov.b:8 4 bytes |
| 664 | |
| 665 | mov.[bwl]:24/32 -> mov.[bwl]:16 2 bytes */ |
| 666 | |
| 667 | static bfd_boolean |
| 668 | elf32_h8_relax_section (bfd *abfd, asection *sec, |
| 669 | struct bfd_link_info *link_info, bfd_boolean *again) |
| 670 | { |
| 671 | Elf_Internal_Shdr *symtab_hdr; |
| 672 | Elf_Internal_Rela *internal_relocs; |
| 673 | Elf_Internal_Rela *irel, *irelend; |
| 674 | bfd_byte *contents = NULL; |
| 675 | Elf_Internal_Sym *isymbuf = NULL; |
| 676 | static asection *last_input_section = NULL; |
| 677 | static Elf_Internal_Rela *last_reloc = NULL; |
| 678 | |
| 679 | /* Assume nothing changes. */ |
| 680 | *again = FALSE; |
| 681 | |
| 682 | /* We don't have to do anything for a relocatable link, if |
| 683 | this section does not have relocs, or if this is not a |
| 684 | code section. */ |
| 685 | if (link_info->relocatable |
| 686 | || (sec->flags & SEC_RELOC) == 0 |
| 687 | || sec->reloc_count == 0 |
| 688 | || (sec->flags & SEC_CODE) == 0) |
| 689 | return TRUE; |
| 690 | |
| 691 | /* If this is the first time we have been called for this section, |
| 692 | initialize the cooked size. */ |
| 693 | if (sec->_cooked_size == 0) |
| 694 | sec->_cooked_size = sec->_raw_size; |
| 695 | |
| 696 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 697 | |
| 698 | /* Get a copy of the native relocations. */ |
| 699 | internal_relocs = (_bfd_elf_link_read_relocs |
| 700 | (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, |
| 701 | link_info->keep_memory)); |
| 702 | if (internal_relocs == NULL) |
| 703 | goto error_return; |
| 704 | |
| 705 | if (sec != last_input_section) |
| 706 | last_reloc = NULL; |
| 707 | |
| 708 | last_input_section = sec; |
| 709 | |
| 710 | /* Walk through the relocs looking for relaxing opportunities. */ |
| 711 | irelend = internal_relocs + sec->reloc_count; |
| 712 | for (irel = internal_relocs; irel < irelend; irel++) |
| 713 | { |
| 714 | bfd_vma symval; |
| 715 | |
| 716 | /* Keep track of the previous reloc so that we can delete |
| 717 | some long jumps created by the compiler. */ |
| 718 | if (irel != internal_relocs) |
| 719 | last_reloc = irel - 1; |
| 720 | |
| 721 | if (ELF32_R_TYPE (irel->r_info) != R_H8_DIR24R8 |
| 722 | && ELF32_R_TYPE (irel->r_info) != R_H8_PCREL16 |
| 723 | && ELF32_R_TYPE (irel->r_info) != R_H8_DIR16A8 |
| 724 | && ELF32_R_TYPE (irel->r_info) != R_H8_DIR24A8 |
| 725 | && ELF32_R_TYPE (irel->r_info) != R_H8_DIR32A16) |
| 726 | continue; |
| 727 | |
| 728 | /* Get the section contents if we haven't done so already. */ |
| 729 | if (contents == NULL) |
| 730 | { |
| 731 | /* Get cached copy if it exists. */ |
| 732 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 733 | contents = elf_section_data (sec)->this_hdr.contents; |
| 734 | else |
| 735 | { |
| 736 | /* Go get them off disk. */ |
| 737 | contents = (bfd_byte *) bfd_malloc (sec->_raw_size); |
| 738 | if (contents == NULL) |
| 739 | goto error_return; |
| 740 | |
| 741 | if (! bfd_get_section_contents (abfd, sec, contents, |
| 742 | (file_ptr) 0, sec->_raw_size)) |
| 743 | goto error_return; |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | /* Read this BFD's local symbols if we haven't done so already. */ |
| 748 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 749 | { |
| 750 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 751 | if (isymbuf == NULL) |
| 752 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 753 | symtab_hdr->sh_info, 0, |
| 754 | NULL, NULL, NULL); |
| 755 | if (isymbuf == NULL) |
| 756 | goto error_return; |
| 757 | } |
| 758 | |
| 759 | /* Get the value of the symbol referred to by the reloc. */ |
| 760 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 761 | { |
| 762 | /* A local symbol. */ |
| 763 | Elf_Internal_Sym *isym; |
| 764 | asection *sym_sec; |
| 765 | |
| 766 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 767 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 768 | symval = isym->st_value; |
| 769 | /* If the reloc is absolute, it will not have |
| 770 | a symbol or section associated with it. */ |
| 771 | if (sym_sec) |
| 772 | symval += sym_sec->output_section->vma |
| 773 | + sym_sec->output_offset; |
| 774 | } |
| 775 | else |
| 776 | { |
| 777 | unsigned long indx; |
| 778 | struct elf_link_hash_entry *h; |
| 779 | |
| 780 | /* An external symbol. */ |
| 781 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| 782 | h = elf_sym_hashes (abfd)[indx]; |
| 783 | BFD_ASSERT (h != NULL); |
| 784 | if (h->root.type != bfd_link_hash_defined |
| 785 | && h->root.type != bfd_link_hash_defweak) |
| 786 | { |
| 787 | /* This appears to be a reference to an undefined |
| 788 | symbol. Just ignore it--it will be caught by the |
| 789 | regular reloc processing. */ |
| 790 | continue; |
| 791 | } |
| 792 | |
| 793 | symval = (h->root.u.def.value |
| 794 | + h->root.u.def.section->output_section->vma |
| 795 | + h->root.u.def.section->output_offset); |
| 796 | } |
| 797 | |
| 798 | /* For simplicity of coding, we are going to modify the section |
| 799 | contents, the section relocs, and the BFD symbol table. We |
| 800 | must tell the rest of the code not to free up this |
| 801 | information. It would be possible to instead create a table |
| 802 | of changes which have to be made, as is done in coff-mips.c; |
| 803 | that would be more work, but would require less memory when |
| 804 | the linker is run. */ |
| 805 | switch (ELF32_R_TYPE (irel->r_info)) |
| 806 | { |
| 807 | /* Try to turn a 24 bit absolute branch/call into an 8 bit |
| 808 | pc-relative branch/call. */ |
| 809 | case R_H8_DIR24R8: |
| 810 | { |
| 811 | bfd_vma value = symval + irel->r_addend; |
| 812 | bfd_vma dot, gap; |
| 813 | |
| 814 | /* Get the address of this instruction. */ |
| 815 | dot = (sec->output_section->vma |
| 816 | + sec->output_offset + irel->r_offset - 1); |
| 817 | |
| 818 | /* Compute the distance from this insn to the branch target. */ |
| 819 | gap = value - dot; |
| 820 | |
| 821 | /* If the distance is within -126..+130 inclusive, then we can |
| 822 | relax this jump. +130 is valid since the target will move |
| 823 | two bytes closer if we do relax this branch. */ |
| 824 | if ((int) gap >= -126 && (int) gap <= 130) |
| 825 | { |
| 826 | unsigned char code; |
| 827 | |
| 828 | /* Note that we've changed the relocs, section contents, |
| 829 | etc. */ |
| 830 | elf_section_data (sec)->relocs = internal_relocs; |
| 831 | elf_section_data (sec)->this_hdr.contents = contents; |
| 832 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 833 | |
| 834 | /* Get the instruction code being relaxed. */ |
| 835 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 836 | |
| 837 | /* If the previous instruction conditionally jumped around |
| 838 | this instruction, we may be able to reverse the condition |
| 839 | and redirect the previous instruction to the target of |
| 840 | this instruction. |
| 841 | |
| 842 | Such sequences are used by the compiler to deal with |
| 843 | long conditional branches. |
| 844 | |
| 845 | Only perform this optimisation for jumps (code 0x5a) not |
| 846 | subroutine calls, as otherwise it could transform: |
| 847 | |
| 848 | mov.w r0,r0 |
| 849 | beq .L1 |
| 850 | jsr @_bar |
| 851 | .L1: rts |
| 852 | _bar: rts |
| 853 | into: |
| 854 | mov.w r0,r0 |
| 855 | bne _bar |
| 856 | rts |
| 857 | _bar: rts |
| 858 | |
| 859 | which changes the call (jsr) into a branch (bne). */ |
| 860 | if (code == 0x5a |
| 861 | && (int) gap <= 130 |
| 862 | && (int) gap >= -128 |
| 863 | && last_reloc |
| 864 | && ELF32_R_TYPE (last_reloc->r_info) == R_H8_PCREL8 |
| 865 | && ELF32_R_SYM (last_reloc->r_info) < symtab_hdr->sh_info) |
| 866 | { |
| 867 | bfd_vma last_value; |
| 868 | asection *last_sym_sec; |
| 869 | Elf_Internal_Sym *last_sym; |
| 870 | |
| 871 | /* We will need to examine the symbol used by the |
| 872 | previous relocation. */ |
| 873 | |
| 874 | last_sym = isymbuf + ELF32_R_SYM (last_reloc->r_info); |
| 875 | last_sym_sec |
| 876 | = bfd_section_from_elf_index (abfd, last_sym->st_shndx); |
| 877 | last_value = (last_sym->st_value |
| 878 | + last_sym_sec->output_section->vma |
| 879 | + last_sym_sec->output_offset); |
| 880 | |
| 881 | /* Verify that the previous relocation was for a |
| 882 | branch around this instruction and that no symbol |
| 883 | exists at the current location. */ |
| 884 | if (last_value == dot + 4 |
| 885 | && last_reloc->r_offset + 2 == irel->r_offset |
| 886 | && ! elf32_h8_symbol_address_p (abfd, sec, dot)) |
| 887 | { |
| 888 | /* We can eliminate this jump. Twiddle the |
| 889 | previous relocation as necessary. */ |
| 890 | irel->r_info |
| 891 | = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 892 | ELF32_R_TYPE (R_H8_NONE)); |
| 893 | |
| 894 | last_reloc->r_info |
| 895 | = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 896 | ELF32_R_TYPE (R_H8_PCREL8)); |
| 897 | last_reloc->r_addend = irel->r_addend; |
| 898 | |
| 899 | code = bfd_get_8 (abfd, |
| 900 | contents + last_reloc->r_offset - 1); |
| 901 | code ^= 1; |
| 902 | bfd_put_8 (abfd, |
| 903 | code, |
| 904 | contents + last_reloc->r_offset - 1); |
| 905 | |
| 906 | /* Delete four bytes of data. */ |
| 907 | if (!elf32_h8_relax_delete_bytes (abfd, sec, |
| 908 | irel->r_offset - 1, |
| 909 | 4)) |
| 910 | goto error_return; |
| 911 | |
| 912 | *again = TRUE; |
| 913 | break; |
| 914 | } |
| 915 | } |
| 916 | |
| 917 | if (code == 0x5e) |
| 918 | bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 1); |
| 919 | else if (code == 0x5a) |
| 920 | bfd_put_8 (abfd, 0x40, contents + irel->r_offset - 1); |
| 921 | else |
| 922 | abort (); |
| 923 | |
| 924 | /* Fix the relocation's type. */ |
| 925 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 926 | R_H8_PCREL8); |
| 927 | |
| 928 | /* Delete two bytes of data. */ |
| 929 | if (!elf32_h8_relax_delete_bytes (abfd, sec, |
| 930 | irel->r_offset + 1, 2)) |
| 931 | goto error_return; |
| 932 | |
| 933 | /* That will change things, so, we should relax again. |
| 934 | Note that this is not required, and it may be slow. */ |
| 935 | *again = TRUE; |
| 936 | } |
| 937 | break; |
| 938 | } |
| 939 | |
| 940 | /* Try to turn a 16bit pc-relative branch into a 8bit pc-relative |
| 941 | branch. */ |
| 942 | case R_H8_PCREL16: |
| 943 | { |
| 944 | bfd_vma value = symval + irel->r_addend; |
| 945 | bfd_vma dot; |
| 946 | bfd_vma gap; |
| 947 | |
| 948 | /* Get the address of this instruction. */ |
| 949 | dot = (sec->output_section->vma |
| 950 | + sec->output_offset |
| 951 | + irel->r_offset - 2); |
| 952 | |
| 953 | gap = value - dot; |
| 954 | |
| 955 | /* If the distance is within -126..+130 inclusive, then we can |
| 956 | relax this jump. +130 is valid since the target will move |
| 957 | two bytes closer if we do relax this branch. */ |
| 958 | if ((int) gap >= -126 && (int) gap <= 130) |
| 959 | { |
| 960 | unsigned char code; |
| 961 | |
| 962 | /* Note that we've changed the relocs, section contents, |
| 963 | etc. */ |
| 964 | elf_section_data (sec)->relocs = internal_relocs; |
| 965 | elf_section_data (sec)->this_hdr.contents = contents; |
| 966 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 967 | |
| 968 | /* Get the opcode. */ |
| 969 | code = bfd_get_8 (abfd, contents + irel->r_offset - 2); |
| 970 | |
| 971 | if (code == 0x58) |
| 972 | { |
| 973 | /* bCC:16 -> bCC:8 */ |
| 974 | /* Get the condition code from the original insn. */ |
| 975 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 976 | code &= 0xf0; |
| 977 | code >>= 4; |
| 978 | code |= 0x40; |
| 979 | bfd_put_8 (abfd, code, contents + irel->r_offset - 2); |
| 980 | } |
| 981 | else if (code == 0x5c) |
| 982 | bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 2); |
| 983 | else |
| 984 | abort (); |
| 985 | |
| 986 | /* Fix the relocation's type. */ |
| 987 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 988 | R_H8_PCREL8); |
| 989 | irel->r_offset--; |
| 990 | |
| 991 | /* Delete two bytes of data. */ |
| 992 | if (!elf32_h8_relax_delete_bytes (abfd, sec, |
| 993 | irel->r_offset + 1, 2)) |
| 994 | goto error_return; |
| 995 | |
| 996 | /* That will change things, so, we should relax again. |
| 997 | Note that this is not required, and it may be slow. */ |
| 998 | *again = TRUE; |
| 999 | } |
| 1000 | break; |
| 1001 | } |
| 1002 | |
| 1003 | /* This is a 16 bit absolute address in a "mov.b" insn, which may |
| 1004 | become an 8 bit absolute address if its in the right range. */ |
| 1005 | case R_H8_DIR16A8: |
| 1006 | { |
| 1007 | bfd_vma value; |
| 1008 | |
| 1009 | value = bfd_h8300_pad_address (abfd, symval + irel->r_addend); |
| 1010 | if (value >= 0xffffff00u) |
| 1011 | { |
| 1012 | unsigned char code; |
| 1013 | |
| 1014 | /* Note that we've changed the relocs, section contents, |
| 1015 | etc. */ |
| 1016 | elf_section_data (sec)->relocs = internal_relocs; |
| 1017 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1018 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1019 | |
| 1020 | /* Get the opcode. */ |
| 1021 | code = bfd_get_8 (abfd, contents + irel->r_offset - 2); |
| 1022 | |
| 1023 | /* Sanity check. */ |
| 1024 | if (code != 0x6a) |
| 1025 | abort (); |
| 1026 | |
| 1027 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 1028 | |
| 1029 | if ((code & 0xf0) == 0x00) |
| 1030 | bfd_put_8 (abfd, |
| 1031 | (code & 0xf) | 0x20, |
| 1032 | contents + irel->r_offset - 2); |
| 1033 | else if ((code & 0xf0) == 0x80) |
| 1034 | bfd_put_8 (abfd, |
| 1035 | (code & 0xf) | 0x30, |
| 1036 | contents + irel->r_offset - 2); |
| 1037 | else |
| 1038 | abort (); |
| 1039 | |
| 1040 | /* Fix the relocation's type. */ |
| 1041 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1042 | R_H8_DIR8); |
| 1043 | |
| 1044 | /* Move the relocation. */ |
| 1045 | irel->r_offset--; |
| 1046 | |
| 1047 | /* Delete two bytes of data. */ |
| 1048 | if (!elf32_h8_relax_delete_bytes (abfd, sec, |
| 1049 | irel->r_offset + 1, 2)) |
| 1050 | goto error_return; |
| 1051 | |
| 1052 | /* That will change things, so, we should relax again. |
| 1053 | Note that this is not required, and it may be slow. */ |
| 1054 | *again = TRUE; |
| 1055 | } |
| 1056 | break; |
| 1057 | } |
| 1058 | |
| 1059 | /* This is a 24 bit absolute address in a "mov.b" insn, which may |
| 1060 | become an 8 bit absolute address if its in the right range. */ |
| 1061 | case R_H8_DIR24A8: |
| 1062 | { |
| 1063 | bfd_vma value; |
| 1064 | |
| 1065 | value = bfd_h8300_pad_address (abfd, symval + irel->r_addend); |
| 1066 | if (value >= 0xffffff00u) |
| 1067 | { |
| 1068 | unsigned char code; |
| 1069 | |
| 1070 | /* Note that we've changed the relocs, section contents, |
| 1071 | etc. */ |
| 1072 | elf_section_data (sec)->relocs = internal_relocs; |
| 1073 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1074 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1075 | |
| 1076 | /* Get the opcode. */ |
| 1077 | code = bfd_get_8 (abfd, contents + irel->r_offset - 2); |
| 1078 | |
| 1079 | /* Sanity check. */ |
| 1080 | if (code != 0x6a) |
| 1081 | abort (); |
| 1082 | |
| 1083 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 1084 | |
| 1085 | switch (code & 0xf0) |
| 1086 | { |
| 1087 | case 0x20: |
| 1088 | bfd_put_8 (abfd, (code & 0xf) | 0x20, |
| 1089 | contents + irel->r_offset - 2); |
| 1090 | break; |
| 1091 | case 0xa0: |
| 1092 | bfd_put_8 (abfd, (code & 0xf) | 0x30, |
| 1093 | contents + irel->r_offset - 2); |
| 1094 | break; |
| 1095 | default: |
| 1096 | abort (); |
| 1097 | } |
| 1098 | |
| 1099 | /* Fix the relocation's type. */ |
| 1100 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1101 | R_H8_DIR8); |
| 1102 | irel->r_offset--; |
| 1103 | |
| 1104 | /* Delete two bytes of data. */ |
| 1105 | if (!elf32_h8_relax_delete_bytes (abfd, sec, |
| 1106 | irel->r_offset + 1, 4)) |
| 1107 | goto error_return; |
| 1108 | |
| 1109 | /* That will change things, so, we should relax again. |
| 1110 | Note that this is not required, and it may be slow. */ |
| 1111 | *again = TRUE; |
| 1112 | break; |
| 1113 | } |
| 1114 | } |
| 1115 | |
| 1116 | /* FALLTHRU */ |
| 1117 | |
| 1118 | /* This is a 24/32bit absolute address in a "mov" insn, which may |
| 1119 | become a 16bit absoulte address if it is in the right range. */ |
| 1120 | case R_H8_DIR32A16: |
| 1121 | { |
| 1122 | bfd_vma value; |
| 1123 | |
| 1124 | value = bfd_h8300_pad_address (abfd, symval + irel->r_addend); |
| 1125 | if (value <= 0x7fff || value >= 0xffff8000u) |
| 1126 | { |
| 1127 | unsigned char code; |
| 1128 | |
| 1129 | /* Note that we've changed the relocs, section contents, |
| 1130 | etc. */ |
| 1131 | elf_section_data (sec)->relocs = internal_relocs; |
| 1132 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1133 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1134 | |
| 1135 | /* Get the opcode. */ |
| 1136 | code = bfd_get_8 (abfd, contents + irel->r_offset - 1); |
| 1137 | |
| 1138 | /* We just need to turn off bit 0x20. */ |
| 1139 | code &= ~0x20; |
| 1140 | |
| 1141 | bfd_put_8 (abfd, code, contents + irel->r_offset - 1); |
| 1142 | |
| 1143 | /* Fix the relocation's type. */ |
| 1144 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1145 | R_H8_DIR16); |
| 1146 | |
| 1147 | /* Delete two bytes of data. */ |
| 1148 | if (!elf32_h8_relax_delete_bytes (abfd, sec, |
| 1149 | irel->r_offset + 1, 2)) |
| 1150 | goto error_return; |
| 1151 | |
| 1152 | /* That will change things, so, we should relax again. |
| 1153 | Note that this is not required, and it may be slow. */ |
| 1154 | *again = TRUE; |
| 1155 | } |
| 1156 | break; |
| 1157 | } |
| 1158 | |
| 1159 | default: |
| 1160 | break; |
| 1161 | } |
| 1162 | } |
| 1163 | |
| 1164 | if (isymbuf != NULL |
| 1165 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1166 | { |
| 1167 | if (! link_info->keep_memory) |
| 1168 | free (isymbuf); |
| 1169 | else |
| 1170 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1171 | } |
| 1172 | |
| 1173 | if (contents != NULL |
| 1174 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1175 | { |
| 1176 | if (! link_info->keep_memory) |
| 1177 | free (contents); |
| 1178 | else |
| 1179 | { |
| 1180 | /* Cache the section contents for elf_link_input_bfd. */ |
| 1181 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1182 | } |
| 1183 | } |
| 1184 | |
| 1185 | if (internal_relocs != NULL |
| 1186 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1187 | free (internal_relocs); |
| 1188 | |
| 1189 | return TRUE; |
| 1190 | |
| 1191 | error_return: |
| 1192 | if (isymbuf != NULL |
| 1193 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1194 | free (isymbuf); |
| 1195 | if (contents != NULL |
| 1196 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1197 | free (contents); |
| 1198 | if (internal_relocs != NULL |
| 1199 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1200 | free (internal_relocs); |
| 1201 | return FALSE; |
| 1202 | } |
| 1203 | |
| 1204 | /* Delete some bytes from a section while relaxing. */ |
| 1205 | |
| 1206 | static bfd_boolean |
| 1207 | elf32_h8_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count) |
| 1208 | { |
| 1209 | Elf_Internal_Shdr *symtab_hdr; |
| 1210 | unsigned int sec_shndx; |
| 1211 | bfd_byte *contents; |
| 1212 | Elf_Internal_Rela *irel, *irelend; |
| 1213 | Elf_Internal_Rela *irelalign; |
| 1214 | Elf_Internal_Sym *isym; |
| 1215 | Elf_Internal_Sym *isymend; |
| 1216 | bfd_vma toaddr; |
| 1217 | struct elf_link_hash_entry **sym_hashes; |
| 1218 | struct elf_link_hash_entry **end_hashes; |
| 1219 | unsigned int symcount; |
| 1220 | |
| 1221 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 1222 | |
| 1223 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1224 | |
| 1225 | /* The deletion must stop at the next ALIGN reloc for an aligment |
| 1226 | power larger than the number of bytes we are deleting. */ |
| 1227 | |
| 1228 | irelalign = NULL; |
| 1229 | toaddr = sec->_cooked_size; |
| 1230 | |
| 1231 | irel = elf_section_data (sec)->relocs; |
| 1232 | irelend = irel + sec->reloc_count; |
| 1233 | |
| 1234 | /* Actually delete the bytes. */ |
| 1235 | memmove (contents + addr, contents + addr + count, |
| 1236 | (size_t) (toaddr - addr - count)); |
| 1237 | sec->_cooked_size -= count; |
| 1238 | |
| 1239 | /* Adjust all the relocs. */ |
| 1240 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| 1241 | { |
| 1242 | /* Get the new reloc address. */ |
| 1243 | if ((irel->r_offset > addr |
| 1244 | && irel->r_offset < toaddr)) |
| 1245 | irel->r_offset -= count; |
| 1246 | } |
| 1247 | |
| 1248 | /* Adjust the local symbols defined in this section. */ |
| 1249 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1250 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1251 | isymend = isym + symtab_hdr->sh_info; |
| 1252 | for (; isym < isymend; isym++) |
| 1253 | { |
| 1254 | if (isym->st_shndx == sec_shndx |
| 1255 | && isym->st_value > addr |
| 1256 | && isym->st_value < toaddr) |
| 1257 | isym->st_value -= count; |
| 1258 | } |
| 1259 | |
| 1260 | /* Now adjust the global symbols defined in this section. */ |
| 1261 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 1262 | - symtab_hdr->sh_info); |
| 1263 | sym_hashes = elf_sym_hashes (abfd); |
| 1264 | end_hashes = sym_hashes + symcount; |
| 1265 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 1266 | { |
| 1267 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 1268 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 1269 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 1270 | && sym_hash->root.u.def.section == sec |
| 1271 | && sym_hash->root.u.def.value > addr |
| 1272 | && sym_hash->root.u.def.value < toaddr) |
| 1273 | { |
| 1274 | sym_hash->root.u.def.value -= count; |
| 1275 | } |
| 1276 | } |
| 1277 | |
| 1278 | return TRUE; |
| 1279 | } |
| 1280 | |
| 1281 | /* Return TRUE if a symbol exists at the given address, else return |
| 1282 | FALSE. */ |
| 1283 | static bfd_boolean |
| 1284 | elf32_h8_symbol_address_p (bfd *abfd, asection *sec, bfd_vma addr) |
| 1285 | { |
| 1286 | Elf_Internal_Shdr *symtab_hdr; |
| 1287 | unsigned int sec_shndx; |
| 1288 | Elf_Internal_Sym *isym; |
| 1289 | Elf_Internal_Sym *isymend; |
| 1290 | struct elf_link_hash_entry **sym_hashes; |
| 1291 | struct elf_link_hash_entry **end_hashes; |
| 1292 | unsigned int symcount; |
| 1293 | |
| 1294 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 1295 | |
| 1296 | /* Examine all the symbols. */ |
| 1297 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1298 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1299 | isymend = isym + symtab_hdr->sh_info; |
| 1300 | for (; isym < isymend; isym++) |
| 1301 | { |
| 1302 | if (isym->st_shndx == sec_shndx |
| 1303 | && isym->st_value == addr) |
| 1304 | return TRUE; |
| 1305 | } |
| 1306 | |
| 1307 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 1308 | - symtab_hdr->sh_info); |
| 1309 | sym_hashes = elf_sym_hashes (abfd); |
| 1310 | end_hashes = sym_hashes + symcount; |
| 1311 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 1312 | { |
| 1313 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 1314 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 1315 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 1316 | && sym_hash->root.u.def.section == sec |
| 1317 | && sym_hash->root.u.def.value == addr) |
| 1318 | return TRUE; |
| 1319 | } |
| 1320 | |
| 1321 | return FALSE; |
| 1322 | } |
| 1323 | |
| 1324 | /* This is a version of bfd_generic_get_relocated_section_contents |
| 1325 | which uses elf32_h8_relocate_section. */ |
| 1326 | |
| 1327 | static bfd_byte * |
| 1328 | elf32_h8_get_relocated_section_contents (bfd *output_bfd, |
| 1329 | struct bfd_link_info *link_info, |
| 1330 | struct bfd_link_order *link_order, |
| 1331 | bfd_byte *data, |
| 1332 | bfd_boolean relocatable, |
| 1333 | asymbol **symbols) |
| 1334 | { |
| 1335 | Elf_Internal_Shdr *symtab_hdr; |
| 1336 | asection *input_section = link_order->u.indirect.section; |
| 1337 | bfd *input_bfd = input_section->owner; |
| 1338 | asection **sections = NULL; |
| 1339 | Elf_Internal_Rela *internal_relocs = NULL; |
| 1340 | Elf_Internal_Sym *isymbuf = NULL; |
| 1341 | |
| 1342 | /* We only need to handle the case of relaxing, or of having a |
| 1343 | particular set of section contents, specially. */ |
| 1344 | if (relocatable |
| 1345 | || elf_section_data (input_section)->this_hdr.contents == NULL) |
| 1346 | return bfd_generic_get_relocated_section_contents (output_bfd, link_info, |
| 1347 | link_order, data, |
| 1348 | relocatable, |
| 1349 | symbols); |
| 1350 | |
| 1351 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1352 | |
| 1353 | memcpy (data, elf_section_data (input_section)->this_hdr.contents, |
| 1354 | (size_t) input_section->_raw_size); |
| 1355 | |
| 1356 | if ((input_section->flags & SEC_RELOC) != 0 |
| 1357 | && input_section->reloc_count > 0) |
| 1358 | { |
| 1359 | asection **secpp; |
| 1360 | Elf_Internal_Sym *isym, *isymend; |
| 1361 | bfd_size_type amt; |
| 1362 | |
| 1363 | internal_relocs = (_bfd_elf_link_read_relocs |
| 1364 | (input_bfd, input_section, (PTR) NULL, |
| 1365 | (Elf_Internal_Rela *) NULL, FALSE)); |
| 1366 | if (internal_relocs == NULL) |
| 1367 | goto error_return; |
| 1368 | |
| 1369 | if (symtab_hdr->sh_info != 0) |
| 1370 | { |
| 1371 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1372 | if (isymbuf == NULL) |
| 1373 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, |
| 1374 | symtab_hdr->sh_info, 0, |
| 1375 | NULL, NULL, NULL); |
| 1376 | if (isymbuf == NULL) |
| 1377 | goto error_return; |
| 1378 | } |
| 1379 | |
| 1380 | amt = symtab_hdr->sh_info; |
| 1381 | amt *= sizeof (asection *); |
| 1382 | sections = (asection **) bfd_malloc (amt); |
| 1383 | if (sections == NULL && amt != 0) |
| 1384 | goto error_return; |
| 1385 | |
| 1386 | isymend = isymbuf + symtab_hdr->sh_info; |
| 1387 | for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) |
| 1388 | { |
| 1389 | asection *isec; |
| 1390 | |
| 1391 | if (isym->st_shndx == SHN_UNDEF) |
| 1392 | isec = bfd_und_section_ptr; |
| 1393 | else if (isym->st_shndx == SHN_ABS) |
| 1394 | isec = bfd_abs_section_ptr; |
| 1395 | else if (isym->st_shndx == SHN_COMMON) |
| 1396 | isec = bfd_com_section_ptr; |
| 1397 | else |
| 1398 | isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); |
| 1399 | |
| 1400 | *secpp = isec; |
| 1401 | } |
| 1402 | |
| 1403 | if (! elf32_h8_relocate_section (output_bfd, link_info, input_bfd, |
| 1404 | input_section, data, internal_relocs, |
| 1405 | isymbuf, sections)) |
| 1406 | goto error_return; |
| 1407 | |
| 1408 | if (sections != NULL) |
| 1409 | free (sections); |
| 1410 | if (isymbuf != NULL |
| 1411 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1412 | free (isymbuf); |
| 1413 | if (elf_section_data (input_section)->relocs != internal_relocs) |
| 1414 | free (internal_relocs); |
| 1415 | } |
| 1416 | |
| 1417 | return data; |
| 1418 | |
| 1419 | error_return: |
| 1420 | if (sections != NULL) |
| 1421 | free (sections); |
| 1422 | if (isymbuf != NULL |
| 1423 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1424 | free (isymbuf); |
| 1425 | if (internal_relocs != NULL |
| 1426 | && elf_section_data (input_section)->relocs != internal_relocs) |
| 1427 | free (internal_relocs); |
| 1428 | return NULL; |
| 1429 | } |
| 1430 | |
| 1431 | |
| 1432 | #define TARGET_BIG_SYM bfd_elf32_h8300_vec |
| 1433 | #define TARGET_BIG_NAME "elf32-h8300" |
| 1434 | #define ELF_ARCH bfd_arch_h8300 |
| 1435 | #define ELF_MACHINE_CODE EM_H8_300 |
| 1436 | #define ELF_MAXPAGESIZE 0x1 |
| 1437 | #define bfd_elf32_bfd_reloc_type_lookup elf32_h8_reloc_type_lookup |
| 1438 | #define elf_info_to_howto elf32_h8_info_to_howto |
| 1439 | #define elf_info_to_howto_rel elf32_h8_info_to_howto_rel |
| 1440 | |
| 1441 | /* So we can set/examine bits in e_flags to get the specific |
| 1442 | H8 architecture in use. */ |
| 1443 | #define elf_backend_final_write_processing \ |
| 1444 | elf32_h8_final_write_processing |
| 1445 | #define elf_backend_object_p \ |
| 1446 | elf32_h8_object_p |
| 1447 | #define bfd_elf32_bfd_merge_private_bfd_data \ |
| 1448 | elf32_h8_merge_private_bfd_data |
| 1449 | |
| 1450 | /* ??? when elf_backend_relocate_section is not defined, elf32-target.h |
| 1451 | defaults to using _bfd_generic_link_hash_table_create, but |
| 1452 | elflink.h:bfd_elf32_size_dynamic_sections uses |
| 1453 | dynobj = elf_hash_table (info)->dynobj; |
| 1454 | and thus requires an elf hash table. */ |
| 1455 | #define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create |
| 1456 | |
| 1457 | /* Use an H8 specific linker, not the ELF generic linker. */ |
| 1458 | #define elf_backend_relocate_section elf32_h8_relocate_section |
| 1459 | #define elf_backend_rela_normal 1 |
| 1460 | |
| 1461 | /* And relaxing stuff. */ |
| 1462 | #define bfd_elf32_bfd_relax_section elf32_h8_relax_section |
| 1463 | #define bfd_elf32_bfd_get_relocated_section_contents \ |
| 1464 | elf32_h8_get_relocated_section_contents |
| 1465 | |
| 1466 | |
| 1467 | #include "elf32-target.h" |