| 1 | /* MSP430-specific support for 32-bit ELF |
| 2 | Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2010 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by Dmitry Diky <diwil@mail.ru> |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | MA 02110-1301, USA. */ |
| 22 | |
| 23 | #include "sysdep.h" |
| 24 | #include "bfd.h" |
| 25 | #include "libiberty.h" |
| 26 | #include "libbfd.h" |
| 27 | #include "elf-bfd.h" |
| 28 | #include "elf/msp430.h" |
| 29 | |
| 30 | /* Use RELA instead of REL. */ |
| 31 | #undef USE_REL |
| 32 | |
| 33 | static reloc_howto_type elf_msp430_howto_table[] = |
| 34 | { |
| 35 | HOWTO (R_MSP430_NONE, /* type */ |
| 36 | 0, /* rightshift */ |
| 37 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 38 | 32, /* bitsize */ |
| 39 | FALSE, /* pc_relative */ |
| 40 | 0, /* bitpos */ |
| 41 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 42 | bfd_elf_generic_reloc, /* special_function */ |
| 43 | "R_MSP430_NONE", /* name */ |
| 44 | FALSE, /* partial_inplace */ |
| 45 | 0, /* src_mask */ |
| 46 | 0, /* dst_mask */ |
| 47 | FALSE), /* pcrel_offset */ |
| 48 | |
| 49 | HOWTO (R_MSP430_32, /* type */ |
| 50 | 0, /* rightshift */ |
| 51 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 52 | 32, /* bitsize */ |
| 53 | FALSE, /* pc_relative */ |
| 54 | 0, /* bitpos */ |
| 55 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 56 | bfd_elf_generic_reloc, /* special_function */ |
| 57 | "R_MSP430_32", /* name */ |
| 58 | FALSE, /* partial_inplace */ |
| 59 | 0xffffffff, /* src_mask */ |
| 60 | 0xffffffff, /* dst_mask */ |
| 61 | FALSE), /* pcrel_offset */ |
| 62 | |
| 63 | /* A 13 bit PC relative relocation. */ |
| 64 | HOWTO (R_MSP430_10_PCREL, /* type */ |
| 65 | 1, /* rightshift */ |
| 66 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 67 | 10, /* bitsize */ |
| 68 | TRUE, /* pc_relative */ |
| 69 | 0, /* bitpos */ |
| 70 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 71 | bfd_elf_generic_reloc, /* special_function */ |
| 72 | "R_MSP430_13_PCREL", /* name */ |
| 73 | FALSE, /* partial_inplace */ |
| 74 | 0xfff, /* src_mask */ |
| 75 | 0xfff, /* dst_mask */ |
| 76 | TRUE), /* pcrel_offset */ |
| 77 | |
| 78 | /* A 16 bit absolute relocation. */ |
| 79 | HOWTO (R_MSP430_16, /* type */ |
| 80 | 0, /* rightshift */ |
| 81 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 82 | 16, /* bitsize */ |
| 83 | FALSE, /* pc_relative */ |
| 84 | 0, /* bitpos */ |
| 85 | complain_overflow_dont,/* complain_on_overflow */ |
| 86 | bfd_elf_generic_reloc, /* special_function */ |
| 87 | "R_MSP430_16", /* name */ |
| 88 | FALSE, /* partial_inplace */ |
| 89 | 0, /* src_mask */ |
| 90 | 0xffff, /* dst_mask */ |
| 91 | FALSE), /* pcrel_offset */ |
| 92 | |
| 93 | /* A 16 bit absolute relocation for command address. */ |
| 94 | HOWTO (R_MSP430_16_PCREL, /* type */ |
| 95 | 1, /* rightshift */ |
| 96 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 97 | 16, /* bitsize */ |
| 98 | TRUE, /* pc_relative */ |
| 99 | 0, /* bitpos */ |
| 100 | complain_overflow_dont,/* complain_on_overflow */ |
| 101 | bfd_elf_generic_reloc, /* special_function */ |
| 102 | "R_MSP430_16_PCREL", /* name */ |
| 103 | FALSE, /* partial_inplace */ |
| 104 | 0, /* src_mask */ |
| 105 | 0xffff, /* dst_mask */ |
| 106 | TRUE), /* pcrel_offset */ |
| 107 | |
| 108 | /* A 16 bit absolute relocation, byte operations. */ |
| 109 | HOWTO (R_MSP430_16_BYTE, /* type */ |
| 110 | 0, /* rightshift */ |
| 111 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 112 | 16, /* bitsize */ |
| 113 | FALSE, /* pc_relative */ |
| 114 | 0, /* bitpos */ |
| 115 | complain_overflow_dont,/* complain_on_overflow */ |
| 116 | bfd_elf_generic_reloc, /* special_function */ |
| 117 | "R_MSP430_16_BYTE", /* name */ |
| 118 | FALSE, /* partial_inplace */ |
| 119 | 0xffff, /* src_mask */ |
| 120 | 0xffff, /* dst_mask */ |
| 121 | FALSE), /* pcrel_offset */ |
| 122 | |
| 123 | /* A 16 bit absolute relocation for command address. */ |
| 124 | HOWTO (R_MSP430_16_PCREL_BYTE,/* type */ |
| 125 | 1, /* rightshift */ |
| 126 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 127 | 16, /* bitsize */ |
| 128 | TRUE, /* pc_relative */ |
| 129 | 0, /* bitpos */ |
| 130 | complain_overflow_dont,/* complain_on_overflow */ |
| 131 | bfd_elf_generic_reloc, /* special_function */ |
| 132 | "R_MSP430_16_PCREL_BYTE",/* name */ |
| 133 | FALSE, /* partial_inplace */ |
| 134 | 0xffff, /* src_mask */ |
| 135 | 0xffff, /* dst_mask */ |
| 136 | TRUE), /* pcrel_offset */ |
| 137 | |
| 138 | /* A 13 bit PC relative relocation for complicated polymorphs. */ |
| 139 | HOWTO (R_MSP430_2X_PCREL, /* type */ |
| 140 | 1, /* rightshift */ |
| 141 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 142 | 10, /* bitsize */ |
| 143 | TRUE, /* pc_relative */ |
| 144 | 0, /* bitpos */ |
| 145 | complain_overflow_bitfield,/* complain_on_overflow */ |
| 146 | bfd_elf_generic_reloc, /* special_function */ |
| 147 | "R_MSP430_2X_PCREL", /* name */ |
| 148 | FALSE, /* partial_inplace */ |
| 149 | 0xfff, /* src_mask */ |
| 150 | 0xfff, /* dst_mask */ |
| 151 | TRUE), /* pcrel_offset */ |
| 152 | |
| 153 | /* A 16 bit relaxable relocation for command address. */ |
| 154 | HOWTO (R_MSP430_RL_PCREL, /* type */ |
| 155 | 1, /* rightshift */ |
| 156 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 157 | 16, /* bitsize */ |
| 158 | TRUE, /* pc_relative */ |
| 159 | 0, /* bitpos */ |
| 160 | complain_overflow_dont,/* complain_on_overflow */ |
| 161 | bfd_elf_generic_reloc, /* special_function */ |
| 162 | "R_MSP430_RL_PCREL", /* name */ |
| 163 | FALSE, /* partial_inplace */ |
| 164 | 0, /* src_mask */ |
| 165 | 0xffff, /* dst_mask */ |
| 166 | TRUE) /* pcrel_offset */ |
| 167 | }; |
| 168 | |
| 169 | /* Map BFD reloc types to MSP430 ELF reloc types. */ |
| 170 | |
| 171 | struct msp430_reloc_map |
| 172 | { |
| 173 | bfd_reloc_code_real_type bfd_reloc_val; |
| 174 | unsigned int elf_reloc_val; |
| 175 | }; |
| 176 | |
| 177 | static const struct msp430_reloc_map msp430_reloc_map[] = |
| 178 | { |
| 179 | {BFD_RELOC_NONE, R_MSP430_NONE}, |
| 180 | {BFD_RELOC_32, R_MSP430_32}, |
| 181 | {BFD_RELOC_MSP430_10_PCREL, R_MSP430_10_PCREL}, |
| 182 | {BFD_RELOC_16, R_MSP430_16_BYTE}, |
| 183 | {BFD_RELOC_MSP430_16_PCREL, R_MSP430_16_PCREL}, |
| 184 | {BFD_RELOC_MSP430_16, R_MSP430_16}, |
| 185 | {BFD_RELOC_MSP430_16_PCREL_BYTE, R_MSP430_16_PCREL_BYTE}, |
| 186 | {BFD_RELOC_MSP430_16_BYTE, R_MSP430_16_BYTE}, |
| 187 | {BFD_RELOC_MSP430_2X_PCREL, R_MSP430_2X_PCREL}, |
| 188 | {BFD_RELOC_MSP430_RL_PCREL, R_MSP430_RL_PCREL} |
| 189 | }; |
| 190 | |
| 191 | static reloc_howto_type * |
| 192 | bfd_elf32_bfd_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, |
| 193 | bfd_reloc_code_real_type code) |
| 194 | { |
| 195 | unsigned int i; |
| 196 | |
| 197 | for (i = 0; i < ARRAY_SIZE (msp430_reloc_map); i++) |
| 198 | if (msp430_reloc_map[i].bfd_reloc_val == code) |
| 199 | return &elf_msp430_howto_table[msp430_reloc_map[i].elf_reloc_val]; |
| 200 | |
| 201 | return NULL; |
| 202 | } |
| 203 | |
| 204 | static reloc_howto_type * |
| 205 | bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 206 | const char *r_name) |
| 207 | { |
| 208 | unsigned int i; |
| 209 | |
| 210 | for (i = 0; |
| 211 | i < (sizeof (elf_msp430_howto_table) |
| 212 | / sizeof (elf_msp430_howto_table[0])); |
| 213 | i++) |
| 214 | if (elf_msp430_howto_table[i].name != NULL |
| 215 | && strcasecmp (elf_msp430_howto_table[i].name, r_name) == 0) |
| 216 | return &elf_msp430_howto_table[i]; |
| 217 | |
| 218 | return NULL; |
| 219 | } |
| 220 | |
| 221 | /* Set the howto pointer for an MSP430 ELF reloc. */ |
| 222 | |
| 223 | static void |
| 224 | msp430_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED, |
| 225 | arelent * cache_ptr, |
| 226 | Elf_Internal_Rela * dst) |
| 227 | { |
| 228 | unsigned int r_type; |
| 229 | |
| 230 | r_type = ELF32_R_TYPE (dst->r_info); |
| 231 | BFD_ASSERT (r_type < (unsigned int) R_MSP430_max); |
| 232 | cache_ptr->howto = &elf_msp430_howto_table[r_type]; |
| 233 | } |
| 234 | |
| 235 | /* Look through the relocs for a section during the first phase. |
| 236 | Since we don't do .gots or .plts, we just need to consider the |
| 237 | virtual table relocs for gc. */ |
| 238 | |
| 239 | static bfd_boolean |
| 240 | elf32_msp430_check_relocs (bfd * abfd, struct bfd_link_info * info, |
| 241 | asection * sec, const Elf_Internal_Rela * relocs) |
| 242 | { |
| 243 | Elf_Internal_Shdr *symtab_hdr; |
| 244 | struct elf_link_hash_entry **sym_hashes; |
| 245 | const Elf_Internal_Rela *rel; |
| 246 | const Elf_Internal_Rela *rel_end; |
| 247 | |
| 248 | if (info->relocatable) |
| 249 | return TRUE; |
| 250 | |
| 251 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 252 | sym_hashes = elf_sym_hashes (abfd); |
| 253 | |
| 254 | rel_end = relocs + sec->reloc_count; |
| 255 | for (rel = relocs; rel < rel_end; rel++) |
| 256 | { |
| 257 | struct elf_link_hash_entry *h; |
| 258 | unsigned long r_symndx; |
| 259 | |
| 260 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 261 | if (r_symndx < symtab_hdr->sh_info) |
| 262 | h = NULL; |
| 263 | else |
| 264 | { |
| 265 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 266 | while (h->root.type == bfd_link_hash_indirect |
| 267 | || h->root.type == bfd_link_hash_warning) |
| 268 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | return TRUE; |
| 273 | } |
| 274 | |
| 275 | /* Perform a single relocation. By default we use the standard BFD |
| 276 | routines, but a few relocs, we have to do them ourselves. */ |
| 277 | |
| 278 | static bfd_reloc_status_type |
| 279 | msp430_final_link_relocate (reloc_howto_type * howto, bfd * input_bfd, |
| 280 | asection * input_section, bfd_byte * contents, |
| 281 | Elf_Internal_Rela * rel, bfd_vma relocation) |
| 282 | { |
| 283 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 284 | bfd_vma x; |
| 285 | bfd_signed_vma srel; |
| 286 | |
| 287 | switch (howto->type) |
| 288 | { |
| 289 | case R_MSP430_10_PCREL: |
| 290 | contents += rel->r_offset; |
| 291 | srel = (bfd_signed_vma) relocation; |
| 292 | srel += rel->r_addend; |
| 293 | srel -= rel->r_offset; |
| 294 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
| 295 | srel -= (input_section->output_section->vma + |
| 296 | input_section->output_offset); |
| 297 | |
| 298 | if (srel & 1) |
| 299 | return bfd_reloc_outofrange; |
| 300 | |
| 301 | /* MSP430 addresses commands as words. */ |
| 302 | srel >>= 1; |
| 303 | |
| 304 | /* Check for an overflow. */ |
| 305 | if (srel < -512 || srel > 511) |
| 306 | return bfd_reloc_overflow; |
| 307 | |
| 308 | x = bfd_get_16 (input_bfd, contents); |
| 309 | x = (x & 0xfc00) | (srel & 0x3ff); |
| 310 | bfd_put_16 (input_bfd, x, contents); |
| 311 | break; |
| 312 | |
| 313 | case R_MSP430_2X_PCREL: |
| 314 | contents += rel->r_offset; |
| 315 | srel = (bfd_signed_vma) relocation; |
| 316 | srel += rel->r_addend; |
| 317 | srel -= rel->r_offset; |
| 318 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
| 319 | srel -= (input_section->output_section->vma + |
| 320 | input_section->output_offset); |
| 321 | |
| 322 | if (srel & 1) |
| 323 | return bfd_reloc_outofrange; |
| 324 | |
| 325 | /* MSP430 addresses commands as words. */ |
| 326 | srel >>= 1; |
| 327 | |
| 328 | /* Check for an overflow. */ |
| 329 | if (srel < -512 || srel > 511) |
| 330 | return bfd_reloc_overflow; |
| 331 | |
| 332 | x = bfd_get_16 (input_bfd, contents); |
| 333 | x = (x & 0xfc00) | (srel & 0x3ff); |
| 334 | bfd_put_16 (input_bfd, x, contents); |
| 335 | /* Handle second jump instruction. */ |
| 336 | x = bfd_get_16 (input_bfd, contents - 2); |
| 337 | srel += 1; |
| 338 | x = (x & 0xfc00) | (srel & 0x3ff); |
| 339 | bfd_put_16 (input_bfd, x, contents - 2); |
| 340 | break; |
| 341 | |
| 342 | case R_MSP430_16_PCREL: |
| 343 | case R_MSP430_RL_PCREL: |
| 344 | contents += rel->r_offset; |
| 345 | srel = (bfd_signed_vma) relocation; |
| 346 | srel += rel->r_addend; |
| 347 | srel -= rel->r_offset; |
| 348 | /* Only branch instructions add 2 to the PC... */ |
| 349 | srel -= (input_section->output_section->vma + |
| 350 | input_section->output_offset); |
| 351 | |
| 352 | if (srel & 1) |
| 353 | return bfd_reloc_outofrange; |
| 354 | |
| 355 | bfd_put_16 (input_bfd, srel & 0xffff, contents); |
| 356 | break; |
| 357 | |
| 358 | case R_MSP430_16_PCREL_BYTE: |
| 359 | contents += rel->r_offset; |
| 360 | srel = (bfd_signed_vma) relocation; |
| 361 | srel += rel->r_addend; |
| 362 | srel -= rel->r_offset; |
| 363 | /* Only branch instructions add 2 to the PC... */ |
| 364 | srel -= (input_section->output_section->vma + |
| 365 | input_section->output_offset); |
| 366 | |
| 367 | bfd_put_16 (input_bfd, srel & 0xffff, contents); |
| 368 | break; |
| 369 | |
| 370 | case R_MSP430_16_BYTE: |
| 371 | contents += rel->r_offset; |
| 372 | srel = (bfd_signed_vma) relocation; |
| 373 | srel += rel->r_addend; |
| 374 | bfd_put_16 (input_bfd, srel & 0xffff, contents); |
| 375 | break; |
| 376 | |
| 377 | case R_MSP430_16: |
| 378 | contents += rel->r_offset; |
| 379 | srel = (bfd_signed_vma) relocation; |
| 380 | srel += rel->r_addend; |
| 381 | |
| 382 | if (srel & 1) |
| 383 | return bfd_reloc_notsupported; |
| 384 | |
| 385 | bfd_put_16 (input_bfd, srel & 0xffff, contents); |
| 386 | break; |
| 387 | |
| 388 | default: |
| 389 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 390 | contents, rel->r_offset, |
| 391 | relocation, rel->r_addend); |
| 392 | } |
| 393 | |
| 394 | return r; |
| 395 | } |
| 396 | |
| 397 | /* Relocate an MSP430 ELF section. */ |
| 398 | |
| 399 | static bfd_boolean |
| 400 | elf32_msp430_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED, |
| 401 | struct bfd_link_info * info, |
| 402 | bfd * input_bfd, |
| 403 | asection * input_section, |
| 404 | bfd_byte * contents, |
| 405 | Elf_Internal_Rela * relocs, |
| 406 | Elf_Internal_Sym * local_syms, |
| 407 | asection ** local_sections) |
| 408 | { |
| 409 | Elf_Internal_Shdr *symtab_hdr; |
| 410 | struct elf_link_hash_entry **sym_hashes; |
| 411 | Elf_Internal_Rela *rel; |
| 412 | Elf_Internal_Rela *relend; |
| 413 | |
| 414 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 415 | sym_hashes = elf_sym_hashes (input_bfd); |
| 416 | relend = relocs + input_section->reloc_count; |
| 417 | |
| 418 | for (rel = relocs; rel < relend; rel++) |
| 419 | { |
| 420 | reloc_howto_type *howto; |
| 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 | const char *name = NULL; |
| 428 | int r_type; |
| 429 | |
| 430 | r_type = ELF32_R_TYPE (rel->r_info); |
| 431 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 432 | howto = elf_msp430_howto_table + r_type; |
| 433 | h = NULL; |
| 434 | sym = NULL; |
| 435 | sec = NULL; |
| 436 | |
| 437 | if (r_symndx < symtab_hdr->sh_info) |
| 438 | { |
| 439 | sym = local_syms + r_symndx; |
| 440 | sec = local_sections[r_symndx]; |
| 441 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 442 | |
| 443 | name = bfd_elf_string_from_elf_section |
| 444 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 445 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; |
| 446 | } |
| 447 | else |
| 448 | { |
| 449 | bfd_boolean unresolved_reloc, warned; |
| 450 | |
| 451 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 452 | r_symndx, symtab_hdr, sym_hashes, |
| 453 | h, sec, relocation, |
| 454 | unresolved_reloc, warned); |
| 455 | } |
| 456 | |
| 457 | if (sec != NULL && elf_discarded_section (sec)) |
| 458 | { |
| 459 | /* For relocs against symbols from removed linkonce sections, |
| 460 | or sections discarded by a linker script, we just want the |
| 461 | section contents zeroed. Avoid any special processing. */ |
| 462 | _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); |
| 463 | rel->r_info = 0; |
| 464 | rel->r_addend = 0; |
| 465 | continue; |
| 466 | } |
| 467 | |
| 468 | if (info->relocatable) |
| 469 | continue; |
| 470 | |
| 471 | r = msp430_final_link_relocate (howto, input_bfd, input_section, |
| 472 | contents, rel, relocation); |
| 473 | |
| 474 | if (r != bfd_reloc_ok) |
| 475 | { |
| 476 | const char *msg = (const char *) NULL; |
| 477 | |
| 478 | switch (r) |
| 479 | { |
| 480 | case bfd_reloc_overflow: |
| 481 | r = info->callbacks->reloc_overflow |
| 482 | (info, (h ? &h->root : NULL), name, howto->name, |
| 483 | (bfd_vma) 0, input_bfd, input_section, |
| 484 | rel->r_offset); |
| 485 | break; |
| 486 | |
| 487 | case bfd_reloc_undefined: |
| 488 | r = info->callbacks->undefined_symbol |
| 489 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); |
| 490 | break; |
| 491 | |
| 492 | case bfd_reloc_outofrange: |
| 493 | msg = _("internal error: out of range error"); |
| 494 | break; |
| 495 | |
| 496 | case bfd_reloc_notsupported: |
| 497 | msg = _("internal error: unsupported relocation error"); |
| 498 | break; |
| 499 | |
| 500 | case bfd_reloc_dangerous: |
| 501 | msg = _("internal error: dangerous relocation"); |
| 502 | break; |
| 503 | |
| 504 | default: |
| 505 | msg = _("internal error: unknown error"); |
| 506 | break; |
| 507 | } |
| 508 | |
| 509 | if (msg) |
| 510 | r = info->callbacks->warning |
| 511 | (info, msg, name, input_bfd, input_section, rel->r_offset); |
| 512 | |
| 513 | if (!r) |
| 514 | return FALSE; |
| 515 | } |
| 516 | |
| 517 | } |
| 518 | |
| 519 | return TRUE; |
| 520 | } |
| 521 | |
| 522 | /* The final processing done just before writing out a MSP430 ELF object |
| 523 | file. This gets the MSP430 architecture right based on the machine |
| 524 | number. */ |
| 525 | |
| 526 | static void |
| 527 | bfd_elf_msp430_final_write_processing (bfd * abfd, |
| 528 | bfd_boolean linker ATTRIBUTE_UNUSED) |
| 529 | { |
| 530 | unsigned long val; |
| 531 | |
| 532 | switch (bfd_get_mach (abfd)) |
| 533 | { |
| 534 | default: |
| 535 | case bfd_mach_msp110: |
| 536 | val = E_MSP430_MACH_MSP430x11x1; |
| 537 | break; |
| 538 | |
| 539 | case bfd_mach_msp11: |
| 540 | val = E_MSP430_MACH_MSP430x11; |
| 541 | break; |
| 542 | |
| 543 | case bfd_mach_msp12: |
| 544 | val = E_MSP430_MACH_MSP430x12; |
| 545 | break; |
| 546 | |
| 547 | case bfd_mach_msp13: |
| 548 | val = E_MSP430_MACH_MSP430x13; |
| 549 | break; |
| 550 | |
| 551 | case bfd_mach_msp14: |
| 552 | val = E_MSP430_MACH_MSP430x14; |
| 553 | break; |
| 554 | |
| 555 | case bfd_mach_msp15: |
| 556 | val = E_MSP430_MACH_MSP430x15; |
| 557 | break; |
| 558 | |
| 559 | case bfd_mach_msp16: |
| 560 | val = E_MSP430_MACH_MSP430x16; |
| 561 | break; |
| 562 | |
| 563 | case bfd_mach_msp31: |
| 564 | val = E_MSP430_MACH_MSP430x31; |
| 565 | break; |
| 566 | |
| 567 | case bfd_mach_msp32: |
| 568 | val = E_MSP430_MACH_MSP430x32; |
| 569 | break; |
| 570 | |
| 571 | case bfd_mach_msp33: |
| 572 | val = E_MSP430_MACH_MSP430x33; |
| 573 | break; |
| 574 | |
| 575 | case bfd_mach_msp41: |
| 576 | val = E_MSP430_MACH_MSP430x41; |
| 577 | break; |
| 578 | |
| 579 | case bfd_mach_msp42: |
| 580 | val = E_MSP430_MACH_MSP430x42; |
| 581 | break; |
| 582 | |
| 583 | case bfd_mach_msp43: |
| 584 | val = E_MSP430_MACH_MSP430x43; |
| 585 | break; |
| 586 | |
| 587 | case bfd_mach_msp44: |
| 588 | val = E_MSP430_MACH_MSP430x44; |
| 589 | break; |
| 590 | } |
| 591 | |
| 592 | elf_elfheader (abfd)->e_machine = EM_MSP430; |
| 593 | elf_elfheader (abfd)->e_flags &= ~EF_MSP430_MACH; |
| 594 | elf_elfheader (abfd)->e_flags |= val; |
| 595 | } |
| 596 | |
| 597 | /* Set the right machine number. */ |
| 598 | |
| 599 | static bfd_boolean |
| 600 | elf32_msp430_object_p (bfd * abfd) |
| 601 | { |
| 602 | int e_set = bfd_mach_msp14; |
| 603 | |
| 604 | if (elf_elfheader (abfd)->e_machine == EM_MSP430 |
| 605 | || elf_elfheader (abfd)->e_machine == EM_MSP430_OLD) |
| 606 | { |
| 607 | int e_mach = elf_elfheader (abfd)->e_flags & EF_MSP430_MACH; |
| 608 | |
| 609 | switch (e_mach) |
| 610 | { |
| 611 | default: |
| 612 | case E_MSP430_MACH_MSP430x11: |
| 613 | e_set = bfd_mach_msp11; |
| 614 | break; |
| 615 | |
| 616 | case E_MSP430_MACH_MSP430x11x1: |
| 617 | e_set = bfd_mach_msp110; |
| 618 | break; |
| 619 | |
| 620 | case E_MSP430_MACH_MSP430x12: |
| 621 | e_set = bfd_mach_msp12; |
| 622 | break; |
| 623 | |
| 624 | case E_MSP430_MACH_MSP430x13: |
| 625 | e_set = bfd_mach_msp13; |
| 626 | break; |
| 627 | |
| 628 | case E_MSP430_MACH_MSP430x14: |
| 629 | e_set = bfd_mach_msp14; |
| 630 | break; |
| 631 | |
| 632 | case E_MSP430_MACH_MSP430x15: |
| 633 | e_set = bfd_mach_msp15; |
| 634 | break; |
| 635 | |
| 636 | case E_MSP430_MACH_MSP430x16: |
| 637 | e_set = bfd_mach_msp16; |
| 638 | break; |
| 639 | |
| 640 | case E_MSP430_MACH_MSP430x31: |
| 641 | e_set = bfd_mach_msp31; |
| 642 | break; |
| 643 | |
| 644 | case E_MSP430_MACH_MSP430x32: |
| 645 | e_set = bfd_mach_msp32; |
| 646 | break; |
| 647 | |
| 648 | case E_MSP430_MACH_MSP430x33: |
| 649 | e_set = bfd_mach_msp33; |
| 650 | break; |
| 651 | |
| 652 | case E_MSP430_MACH_MSP430x41: |
| 653 | e_set = bfd_mach_msp41; |
| 654 | break; |
| 655 | |
| 656 | case E_MSP430_MACH_MSP430x42: |
| 657 | e_set = bfd_mach_msp42; |
| 658 | break; |
| 659 | |
| 660 | case E_MSP430_MACH_MSP430x43: |
| 661 | e_set = bfd_mach_msp43; |
| 662 | break; |
| 663 | |
| 664 | case E_MSP430_MACH_MSP430x44: |
| 665 | e_set = bfd_mach_msp44; |
| 666 | break; |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | return bfd_default_set_arch_mach (abfd, bfd_arch_msp430, e_set); |
| 671 | } |
| 672 | |
| 673 | /* These functions handle relaxing for the msp430. |
| 674 | Relaxation required only in two cases: |
| 675 | - Bad hand coding like jumps from one section to another or |
| 676 | from file to file. |
| 677 | - Sibling calls. This will affect onlu 'jump label' polymorph. Without |
| 678 | relaxing this enlarges code by 2 bytes. Sibcalls implemented but |
| 679 | do not work in gcc's port by the reason I do not know. |
| 680 | Anyway, if a relaxation required, user should pass -relax option to the |
| 681 | linker. |
| 682 | |
| 683 | There are quite a few relaxing opportunities available on the msp430: |
| 684 | |
| 685 | ================================================================ |
| 686 | |
| 687 | 1. 3 words -> 1 word |
| 688 | |
| 689 | eq == jeq label jne +4; br lab |
| 690 | ne != jne label jeq +4; br lab |
| 691 | lt < jl label jge +4; br lab |
| 692 | ltu < jlo label lhs +4; br lab |
| 693 | ge >= jge label jl +4; br lab |
| 694 | geu >= jhs label jlo +4; br lab |
| 695 | |
| 696 | 2. 4 words -> 1 word |
| 697 | |
| 698 | ltn < jn jn +2; jmp +4; br lab |
| 699 | |
| 700 | 3. 4 words -> 2 words |
| 701 | |
| 702 | gt > jeq +2; jge label jeq +6; jl +4; br label |
| 703 | gtu > jeq +2; jhs label jeq +6; jlo +4; br label |
| 704 | |
| 705 | 4. 4 words -> 2 words and 2 labels |
| 706 | |
| 707 | leu <= jeq label; jlo label jeq +2; jhs +4; br label |
| 708 | le <= jeq label; jl label jeq +2; jge +4; br label |
| 709 | ================================================================= |
| 710 | |
| 711 | codemap for first cases is (labels masked ): |
| 712 | eq: 0x2002,0x4010,0x0000 -> 0x2400 |
| 713 | ne: 0x2402,0x4010,0x0000 -> 0x2000 |
| 714 | lt: 0x3402,0x4010,0x0000 -> 0x3800 |
| 715 | ltu: 0x2c02,0x4010,0x0000 -> 0x2800 |
| 716 | ge: 0x3802,0x4010,0x0000 -> 0x3400 |
| 717 | geu: 0x2802,0x4010,0x0000 -> 0x2c00 |
| 718 | |
| 719 | second case: |
| 720 | ltn: 0x3001,0x3c02,0x4010,0x0000 -> 0x3000 |
| 721 | |
| 722 | third case: |
| 723 | gt: 0x2403,0x3802,0x4010,0x0000 -> 0x2401,0x3400 |
| 724 | gtu: 0x2403,0x2802,0x4010,0x0000 -> 0x2401,0x2c00 |
| 725 | |
| 726 | fourth case: |
| 727 | leu: 0x2401,0x2c02,0x4010,0x0000 -> 0x2400,0x2800 |
| 728 | le: 0x2401,0x3402,0x4010,0x0000 -> 0x2400,0x3800 |
| 729 | |
| 730 | Unspecified case :) |
| 731 | jump: 0x4010,0x0000 -> 0x3c00. */ |
| 732 | |
| 733 | #define NUMB_RELAX_CODES 12 |
| 734 | static struct rcodes_s |
| 735 | { |
| 736 | int f0, f1; /* From code. */ |
| 737 | int t0, t1; /* To code. */ |
| 738 | int labels; /* Position of labels: 1 - one label at first |
| 739 | word, 2 - one at second word, 3 - two |
| 740 | labels at both. */ |
| 741 | int cdx; /* Words to match. */ |
| 742 | int bs; /* Shrink bytes. */ |
| 743 | int off; /* Offset from old label for new code. */ |
| 744 | int ncl; /* New code length. */ |
| 745 | } rcode[] = |
| 746 | {/* lab,cdx,bs,off,ncl */ |
| 747 | { 0x0000, 0x0000, 0x3c00, 0x0000, 1, 0, 2, 2, 2}, /* jump */ |
| 748 | { 0x0000, 0x2002, 0x2400, 0x0000, 1, 1, 4, 4, 2}, /* eq */ |
| 749 | { 0x0000, 0x2402, 0x2000, 0x0000, 1, 1, 4, 4, 2}, /* ne */ |
| 750 | { 0x0000, 0x3402, 0x3800, 0x0000, 1, 1, 4, 4, 2}, /* lt */ |
| 751 | { 0x0000, 0x2c02, 0x2800, 0x0000, 1, 1, 4, 4, 2}, /* ltu */ |
| 752 | { 0x0000, 0x3802, 0x3400, 0x0000, 1, 1, 4, 4, 2}, /* ge */ |
| 753 | { 0x0000, 0x2802, 0x2c00, 0x0000, 1, 1, 4, 4, 2}, /* geu */ |
| 754 | { 0x3001, 0x3c02, 0x3000, 0x0000, 1, 2, 6, 6, 2}, /* ltn */ |
| 755 | { 0x2403, 0x3802, 0x2401, 0x3400, 2, 2, 4, 6, 4}, /* gt */ |
| 756 | { 0x2403, 0x2802, 0x2401, 0x2c00, 2, 2, 4, 6, 4}, /* gtu */ |
| 757 | { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* leu , 2 labels */ |
| 758 | { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* le , 2 labels */ |
| 759 | { 0, 0, 0, 0, 0, 0, 0, 0, 0} |
| 760 | }; |
| 761 | |
| 762 | /* Return TRUE if a symbol exists at the given address. */ |
| 763 | |
| 764 | static bfd_boolean |
| 765 | msp430_elf_symbol_address_p (bfd * abfd, |
| 766 | asection * sec, |
| 767 | Elf_Internal_Sym * isym, |
| 768 | bfd_vma addr) |
| 769 | { |
| 770 | Elf_Internal_Shdr *symtab_hdr; |
| 771 | unsigned int sec_shndx; |
| 772 | Elf_Internal_Sym *isymend; |
| 773 | struct elf_link_hash_entry **sym_hashes; |
| 774 | struct elf_link_hash_entry **end_hashes; |
| 775 | unsigned int symcount; |
| 776 | |
| 777 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 778 | |
| 779 | /* Examine all the local symbols. */ |
| 780 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 781 | for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) |
| 782 | if (isym->st_shndx == sec_shndx && isym->st_value == addr) |
| 783 | return TRUE; |
| 784 | |
| 785 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 786 | - symtab_hdr->sh_info); |
| 787 | sym_hashes = elf_sym_hashes (abfd); |
| 788 | end_hashes = sym_hashes + symcount; |
| 789 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 790 | { |
| 791 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 792 | |
| 793 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 794 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 795 | && sym_hash->root.u.def.section == sec |
| 796 | && sym_hash->root.u.def.value == addr) |
| 797 | return TRUE; |
| 798 | } |
| 799 | |
| 800 | return FALSE; |
| 801 | } |
| 802 | |
| 803 | /* Adjust all local symbols defined as '.section + 0xXXXX' (.section has sec_shndx) |
| 804 | referenced from current and other sections */ |
| 805 | static bfd_boolean |
| 806 | msp430_elf_relax_adjust_locals(bfd * abfd, asection * sec, bfd_vma addr, |
| 807 | int count, unsigned int sec_shndx, bfd_vma toaddr) |
| 808 | { |
| 809 | Elf_Internal_Shdr *symtab_hdr; |
| 810 | Elf_Internal_Rela *irel; |
| 811 | Elf_Internal_Rela *irelend; |
| 812 | Elf_Internal_Sym *isym; |
| 813 | |
| 814 | irel = elf_section_data (sec)->relocs; |
| 815 | irelend = irel + sec->reloc_count; |
| 816 | symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| 817 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 818 | |
| 819 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| 820 | { |
| 821 | int sidx = ELF32_R_SYM(irel->r_info); |
| 822 | Elf_Internal_Sym *lsym = isym + sidx; |
| 823 | |
| 824 | /* Adjust symbols referenced by .sec+0xXX */ |
| 825 | if (irel->r_addend > addr && irel->r_addend < toaddr |
| 826 | && lsym->st_shndx == sec_shndx) |
| 827 | irel->r_addend -= count; |
| 828 | } |
| 829 | |
| 830 | return TRUE; |
| 831 | } |
| 832 | |
| 833 | /* Delete some bytes from a section while relaxing. */ |
| 834 | |
| 835 | static bfd_boolean |
| 836 | msp430_elf_relax_delete_bytes (bfd * abfd, asection * sec, bfd_vma addr, |
| 837 | int count) |
| 838 | { |
| 839 | Elf_Internal_Shdr *symtab_hdr; |
| 840 | unsigned int sec_shndx; |
| 841 | bfd_byte *contents; |
| 842 | Elf_Internal_Rela *irel; |
| 843 | Elf_Internal_Rela *irelend; |
| 844 | bfd_vma toaddr; |
| 845 | Elf_Internal_Sym *isym; |
| 846 | Elf_Internal_Sym *isymend; |
| 847 | struct elf_link_hash_entry **sym_hashes; |
| 848 | struct elf_link_hash_entry **end_hashes; |
| 849 | unsigned int symcount; |
| 850 | asection *p; |
| 851 | |
| 852 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 853 | |
| 854 | contents = elf_section_data (sec)->this_hdr.contents; |
| 855 | |
| 856 | toaddr = sec->size; |
| 857 | |
| 858 | irel = elf_section_data (sec)->relocs; |
| 859 | irelend = irel + sec->reloc_count; |
| 860 | |
| 861 | /* Actually delete the bytes. */ |
| 862 | memmove (contents + addr, contents + addr + count, |
| 863 | (size_t) (toaddr - addr - count)); |
| 864 | sec->size -= count; |
| 865 | |
| 866 | /* Adjust all the relocs. */ |
| 867 | symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| 868 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 869 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| 870 | { |
| 871 | /* Get the new reloc address. */ |
| 872 | if ((irel->r_offset > addr && irel->r_offset < toaddr)) |
| 873 | irel->r_offset -= count; |
| 874 | } |
| 875 | |
| 876 | for (p = abfd->sections; p != NULL; p = p->next) |
| 877 | msp430_elf_relax_adjust_locals(abfd,p,addr,count,sec_shndx,toaddr); |
| 878 | |
| 879 | /* Adjust the local symbols defined in this section. */ |
| 880 | symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| 881 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 882 | for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) |
| 883 | if (isym->st_shndx == sec_shndx |
| 884 | && isym->st_value > addr && isym->st_value < toaddr) |
| 885 | isym->st_value -= count; |
| 886 | |
| 887 | /* Now adjust the global symbols defined in this section. */ |
| 888 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 889 | - symtab_hdr->sh_info); |
| 890 | sym_hashes = elf_sym_hashes (abfd); |
| 891 | end_hashes = sym_hashes + symcount; |
| 892 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 893 | { |
| 894 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 895 | |
| 896 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 897 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 898 | && sym_hash->root.u.def.section == sec |
| 899 | && sym_hash->root.u.def.value > addr |
| 900 | && sym_hash->root.u.def.value < toaddr) |
| 901 | sym_hash->root.u.def.value -= count; |
| 902 | } |
| 903 | |
| 904 | return TRUE; |
| 905 | } |
| 906 | |
| 907 | |
| 908 | static bfd_boolean |
| 909 | msp430_elf_relax_section (bfd * abfd, asection * sec, |
| 910 | struct bfd_link_info * link_info, |
| 911 | bfd_boolean * again) |
| 912 | { |
| 913 | Elf_Internal_Shdr * symtab_hdr; |
| 914 | Elf_Internal_Rela * internal_relocs; |
| 915 | Elf_Internal_Rela * irel; |
| 916 | Elf_Internal_Rela * irelend; |
| 917 | bfd_byte * contents = NULL; |
| 918 | Elf_Internal_Sym * isymbuf = NULL; |
| 919 | |
| 920 | /* Assume nothing changes. */ |
| 921 | *again = FALSE; |
| 922 | |
| 923 | /* We don't have to do anything for a relocatable link, if |
| 924 | this section does not have relocs, or if this is not a |
| 925 | code section. */ |
| 926 | if (link_info->relocatable |
| 927 | || (sec->flags & SEC_RELOC) == 0 |
| 928 | || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0) |
| 929 | return TRUE; |
| 930 | |
| 931 | symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| 932 | |
| 933 | /* Get a copy of the native relocations. */ |
| 934 | internal_relocs = |
| 935 | _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory); |
| 936 | if (internal_relocs == NULL) |
| 937 | goto error_return; |
| 938 | |
| 939 | /* Walk through them looking for relaxing opportunities. */ |
| 940 | irelend = internal_relocs + sec->reloc_count; |
| 941 | for (irel = internal_relocs; irel < irelend; irel++) |
| 942 | { |
| 943 | bfd_vma symval; |
| 944 | |
| 945 | /* If this isn't something that can be relaxed, then ignore |
| 946 | this reloc. */ |
| 947 | if (ELF32_R_TYPE (irel->r_info) != (int) R_MSP430_RL_PCREL) |
| 948 | continue; |
| 949 | |
| 950 | /* Get the section contents if we haven't done so already. */ |
| 951 | if (contents == NULL) |
| 952 | { |
| 953 | /* Get cached copy if it exists. */ |
| 954 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 955 | contents = elf_section_data (sec)->this_hdr.contents; |
| 956 | else if (! bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 957 | goto error_return; |
| 958 | } |
| 959 | |
| 960 | /* Read this BFD's local symbols if we haven't done so already. */ |
| 961 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 962 | { |
| 963 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 964 | if (isymbuf == NULL) |
| 965 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 966 | symtab_hdr->sh_info, 0, |
| 967 | NULL, NULL, NULL); |
| 968 | if (isymbuf == NULL) |
| 969 | goto error_return; |
| 970 | } |
| 971 | |
| 972 | /* Get the value of the symbol referred to by the reloc. */ |
| 973 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 974 | { |
| 975 | /* A local symbol. */ |
| 976 | Elf_Internal_Sym *isym; |
| 977 | asection *sym_sec; |
| 978 | |
| 979 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 980 | if (isym->st_shndx == SHN_UNDEF) |
| 981 | sym_sec = bfd_und_section_ptr; |
| 982 | else if (isym->st_shndx == SHN_ABS) |
| 983 | sym_sec = bfd_abs_section_ptr; |
| 984 | else if (isym->st_shndx == SHN_COMMON) |
| 985 | sym_sec = bfd_com_section_ptr; |
| 986 | else |
| 987 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 988 | symval = (isym->st_value |
| 989 | + sym_sec->output_section->vma + sym_sec->output_offset); |
| 990 | } |
| 991 | else |
| 992 | { |
| 993 | unsigned long indx; |
| 994 | struct elf_link_hash_entry *h; |
| 995 | |
| 996 | /* An external symbol. */ |
| 997 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| 998 | h = elf_sym_hashes (abfd)[indx]; |
| 999 | BFD_ASSERT (h != NULL); |
| 1000 | |
| 1001 | if (h->root.type != bfd_link_hash_defined |
| 1002 | && h->root.type != bfd_link_hash_defweak) |
| 1003 | /* This appears to be a reference to an undefined |
| 1004 | symbol. Just ignore it--it will be caught by the |
| 1005 | regular reloc processing. */ |
| 1006 | continue; |
| 1007 | |
| 1008 | symval = (h->root.u.def.value |
| 1009 | + h->root.u.def.section->output_section->vma |
| 1010 | + h->root.u.def.section->output_offset); |
| 1011 | } |
| 1012 | |
| 1013 | /* For simplicity of coding, we are going to modify the section |
| 1014 | contents, the section relocs, and the BFD symbol table. We |
| 1015 | must tell the rest of the code not to free up this |
| 1016 | information. It would be possible to instead create a table |
| 1017 | of changes which have to be made, as is done in coff-mips.c; |
| 1018 | that would be more work, but would require less memory when |
| 1019 | the linker is run. */ |
| 1020 | |
| 1021 | /* Try to turn a 16bit pc-relative branch into a 10bit pc-relative |
| 1022 | branch. */ |
| 1023 | /* Paranoia? paranoia... */ |
| 1024 | if (ELF32_R_TYPE (irel->r_info) == (int) R_MSP430_RL_PCREL) |
| 1025 | { |
| 1026 | bfd_vma value = symval; |
| 1027 | |
| 1028 | /* Deal with pc-relative gunk. */ |
| 1029 | value -= (sec->output_section->vma + sec->output_offset); |
| 1030 | value -= irel->r_offset; |
| 1031 | value += irel->r_addend; |
| 1032 | |
| 1033 | /* See if the value will fit in 10 bits, note the high value is |
| 1034 | 1016 as the target will be two bytes closer if we are |
| 1035 | able to relax. */ |
| 1036 | if ((long) value < 1016 && (long) value > -1016) |
| 1037 | { |
| 1038 | int code0 = 0, code1 = 0, code2 = 0; |
| 1039 | int i; |
| 1040 | struct rcodes_s *rx; |
| 1041 | |
| 1042 | /* Get the opcode. */ |
| 1043 | if (irel->r_offset >= 6) |
| 1044 | code0 = bfd_get_16 (abfd, contents + irel->r_offset - 6); |
| 1045 | |
| 1046 | if (irel->r_offset >= 4) |
| 1047 | code1 = bfd_get_16 (abfd, contents + irel->r_offset - 4); |
| 1048 | |
| 1049 | code2 = bfd_get_16 (abfd, contents + irel->r_offset - 2); |
| 1050 | |
| 1051 | if (code2 != 0x4010) |
| 1052 | continue; |
| 1053 | |
| 1054 | /* Check r4 and r3. */ |
| 1055 | for (i = NUMB_RELAX_CODES - 1; i >= 0; i--) |
| 1056 | { |
| 1057 | rx = &rcode[i]; |
| 1058 | if (rx->cdx == 2 && rx->f0 == code0 && rx->f1 == code1) |
| 1059 | break; |
| 1060 | else if (rx->cdx == 1 && rx->f1 == code1) |
| 1061 | break; |
| 1062 | else if (rx->cdx == 0) /* This is an unconditional jump. */ |
| 1063 | break; |
| 1064 | } |
| 1065 | |
| 1066 | /* Check labels: |
| 1067 | .Label0: ; we do not care about this label |
| 1068 | jeq +6 |
| 1069 | .Label1: ; make sure there is no label here |
| 1070 | jl +4 |
| 1071 | .Label2: ; make sure there is no label here |
| 1072 | br .Label_dst |
| 1073 | |
| 1074 | So, if there is .Label1 or .Label2 we cannot relax this code. |
| 1075 | This actually should not happen, cause for relaxable |
| 1076 | instructions we use RL_PCREL reloc instead of 16_PCREL. |
| 1077 | Will change this in the future. */ |
| 1078 | |
| 1079 | if (rx->cdx > 0 |
| 1080 | && msp430_elf_symbol_address_p (abfd, sec, isymbuf, |
| 1081 | irel->r_offset - 2)) |
| 1082 | continue; |
| 1083 | if (rx->cdx > 1 |
| 1084 | && msp430_elf_symbol_address_p (abfd, sec, isymbuf, |
| 1085 | irel->r_offset - 4)) |
| 1086 | continue; |
| 1087 | |
| 1088 | /* Note that we've changed the relocs, section contents, etc. */ |
| 1089 | elf_section_data (sec)->relocs = internal_relocs; |
| 1090 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1091 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1092 | |
| 1093 | /* Fix the relocation's type. */ |
| 1094 | if (rx->labels == 3) /* Handle special cases. */ |
| 1095 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1096 | R_MSP430_2X_PCREL); |
| 1097 | else |
| 1098 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 1099 | R_MSP430_10_PCREL); |
| 1100 | |
| 1101 | /* Fix the opcode right way. */ |
| 1102 | bfd_put_16 (abfd, rx->t0, contents + irel->r_offset - rx->off); |
| 1103 | if (rx->t1) |
| 1104 | bfd_put_16 (abfd, rx->t1, |
| 1105 | contents + irel->r_offset - rx->off + 2); |
| 1106 | |
| 1107 | /* Delete bytes. */ |
| 1108 | if (!msp430_elf_relax_delete_bytes (abfd, sec, |
| 1109 | irel->r_offset - rx->off + |
| 1110 | rx->ncl, rx->bs)) |
| 1111 | goto error_return; |
| 1112 | |
| 1113 | /* Handle unconditional jumps. */ |
| 1114 | if (rx->cdx == 0) |
| 1115 | irel->r_offset -= 2; |
| 1116 | |
| 1117 | /* That will change things, so, we should relax again. |
| 1118 | Note that this is not required, and it may be slow. */ |
| 1119 | *again = TRUE; |
| 1120 | } |
| 1121 | } |
| 1122 | } |
| 1123 | |
| 1124 | if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1125 | { |
| 1126 | if (!link_info->keep_memory) |
| 1127 | free (isymbuf); |
| 1128 | else |
| 1129 | { |
| 1130 | /* Cache the symbols for elf_link_input_bfd. */ |
| 1131 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1132 | } |
| 1133 | } |
| 1134 | |
| 1135 | if (contents != NULL |
| 1136 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1137 | { |
| 1138 | if (!link_info->keep_memory) |
| 1139 | free (contents); |
| 1140 | else |
| 1141 | { |
| 1142 | /* Cache the section contents for elf_link_input_bfd. */ |
| 1143 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | if (internal_relocs != NULL |
| 1148 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1149 | free (internal_relocs); |
| 1150 | |
| 1151 | return TRUE; |
| 1152 | |
| 1153 | error_return: |
| 1154 | if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1155 | free (isymbuf); |
| 1156 | if (contents != NULL |
| 1157 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1158 | free (contents); |
| 1159 | if (internal_relocs != NULL |
| 1160 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1161 | free (internal_relocs); |
| 1162 | |
| 1163 | return FALSE; |
| 1164 | } |
| 1165 | |
| 1166 | |
| 1167 | #define ELF_ARCH bfd_arch_msp430 |
| 1168 | #define ELF_MACHINE_CODE EM_MSP430 |
| 1169 | #define ELF_MACHINE_ALT1 EM_MSP430_OLD |
| 1170 | #define ELF_MAXPAGESIZE 1 |
| 1171 | #define ELF_OSABI ELFOSABI_STANDALONE |
| 1172 | |
| 1173 | #define TARGET_LITTLE_SYM bfd_elf32_msp430_vec |
| 1174 | #define TARGET_LITTLE_NAME "elf32-msp430" |
| 1175 | |
| 1176 | #define elf_info_to_howto msp430_info_to_howto_rela |
| 1177 | #define elf_info_to_howto_rel NULL |
| 1178 | #define elf_backend_relocate_section elf32_msp430_relocate_section |
| 1179 | #define elf_backend_check_relocs elf32_msp430_check_relocs |
| 1180 | #define elf_backend_can_gc_sections 1 |
| 1181 | #define elf_backend_final_write_processing bfd_elf_msp430_final_write_processing |
| 1182 | #define elf_backend_object_p elf32_msp430_object_p |
| 1183 | #define elf_backend_post_process_headers _bfd_elf_set_osabi |
| 1184 | #define bfd_elf32_bfd_relax_section msp430_elf_relax_section |
| 1185 | |
| 1186 | #include "elf32-target.h" |