| 1 | /* Infineon XC16X-specific support for 16-bit ELF. |
| 2 | Copyright 2006, 2007 Free Software Foundation, Inc. |
| 3 | Contributed by KPIT Cummins Infosystems |
| 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 3 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, 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "elf-bfd.h" |
| 26 | #include "elf/xc16x.h" |
| 27 | #include "elf/dwarf2.h" |
| 28 | #include "libiberty.h" |
| 29 | |
| 30 | static reloc_howto_type xc16x_elf_howto_table [] = |
| 31 | { |
| 32 | /* This reloc does nothing. */ |
| 33 | HOWTO (R_XC16X_NONE, /* type */ |
| 34 | 0, /* rightshift */ |
| 35 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 36 | 16, /* bitsize */ |
| 37 | FALSE, /* pc_relative */ |
| 38 | 0, /* bitpos */ |
| 39 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 40 | bfd_elf_generic_reloc, /* special_function */ |
| 41 | "R_XC16X_NONE", /* name */ |
| 42 | FALSE, /* partial_inplace */ |
| 43 | 0, /* src_mask */ |
| 44 | 0, /* dst_mask */ |
| 45 | FALSE), /* pcrel_offset */ |
| 46 | |
| 47 | /* An 8 bit absolute relocation. */ |
| 48 | HOWTO (R_XC16X_ABS_8, /* type */ |
| 49 | 0, /* rightshift */ |
| 50 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 51 | 8, /* bitsize */ |
| 52 | FALSE, /* pc_relative */ |
| 53 | 8, /* bitpos */ |
| 54 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 55 | bfd_elf_generic_reloc, /* special_function */ |
| 56 | "R_XC16X_ABS_8", /* name */ |
| 57 | TRUE, /* partial_inplace */ |
| 58 | 0x0000, /* src_mask */ |
| 59 | 0x00ff, /* dst_mask */ |
| 60 | FALSE), /* pcrel_offset */ |
| 61 | |
| 62 | /* A 16 bit absolute relocation. */ |
| 63 | HOWTO (R_XC16X_ABS_16, /* type */ |
| 64 | 0, /* rightshift */ |
| 65 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 66 | 16, /* bitsize */ |
| 67 | FALSE, /* pc_relative */ |
| 68 | 0, /* bitpos */ |
| 69 | complain_overflow_dont, /* complain_on_overflow */ |
| 70 | bfd_elf_generic_reloc, /* special_function */ |
| 71 | "R_XC16X_ABS_16", /* name */ |
| 72 | TRUE, /* partial_inplace */ |
| 73 | 0x00000000, /* src_mask */ |
| 74 | 0x0000ffff, /* dst_mask */ |
| 75 | FALSE), /* pcrel_offset */ |
| 76 | |
| 77 | HOWTO (R_XC16X_ABS_32, /* type */ |
| 78 | 0, /* rightshift */ |
| 79 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 80 | 32, /* bitsize */ |
| 81 | FALSE, /* pc_relative */ |
| 82 | 0, /* bitpos */ |
| 83 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 84 | bfd_elf_generic_reloc, /* special_function */ |
| 85 | "R_XC16X_ABS_32", /* name */ |
| 86 | TRUE, /* partial_inplace */ |
| 87 | 0x00000000, /* src_mask */ |
| 88 | 0xffffffff, /* dst_mask */ |
| 89 | FALSE), /* pcrel_offset */ |
| 90 | |
| 91 | |
| 92 | /* A PC relative 8 bit relocation. */ |
| 93 | HOWTO (R_XC16X_8_PCREL, /* type */ |
| 94 | 0, /* rightshift */ |
| 95 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 96 | 8, /* bitsize */ |
| 97 | TRUE, /* pc_relative */ |
| 98 | 8, /* bitpos */ |
| 99 | complain_overflow_signed, /* complain_on_overflow */ |
| 100 | bfd_elf_generic_reloc, /* special_function */ |
| 101 | "R_XC16X_8_PCREL", /* name */ |
| 102 | FALSE, /* partial_inplace */ |
| 103 | 0x0000, /* src_mask */ |
| 104 | 0x00ff, /* dst_mask */ |
| 105 | TRUE), /* pcrel_offset */ |
| 106 | |
| 107 | /* Relocation regarding page number. */ |
| 108 | HOWTO (R_XC16X_PAG, /* type */ |
| 109 | 0, /* rightshift */ |
| 110 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 111 | 16, /* bitsize */ |
| 112 | FALSE, /* pc_relative */ |
| 113 | 0, /* bitpos */ |
| 114 | complain_overflow_signed, /* complain_on_overflow */ |
| 115 | bfd_elf_generic_reloc, /* special_function */ |
| 116 | "R_XC16X_PAG", /* name */ |
| 117 | TRUE, /* partial_inplace */ |
| 118 | 0x00000000, /* src_mask */ |
| 119 | 0x0000ffff, /* dst_mask */ |
| 120 | FALSE), /* pcrel_offset */ |
| 121 | |
| 122 | |
| 123 | /* Relocation regarding page number. */ |
| 124 | HOWTO (R_XC16X_POF, /* type */ |
| 125 | 0, /* rightshift */ |
| 126 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 127 | 16, /* bitsize */ |
| 128 | FALSE, /* pc_relative */ |
| 129 | 0, /* bitpos */ |
| 130 | complain_overflow_signed, /* complain_on_overflow */ |
| 131 | bfd_elf_generic_reloc, /* special_function */ |
| 132 | "R_XC16X_POF", /* name */ |
| 133 | TRUE, /* partial_inplace */ |
| 134 | 0x00000000, /* src_mask */ |
| 135 | 0x0000ffff, /* dst_mask */ |
| 136 | FALSE), /* pcrel_offset */ |
| 137 | |
| 138 | |
| 139 | /* Relocation regarding segment number. */ |
| 140 | HOWTO (R_XC16X_SEG, /* type */ |
| 141 | 0, /* rightshift */ |
| 142 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 143 | 16, /* bitsize */ |
| 144 | FALSE, /* pc_relative */ |
| 145 | 0, /* bitpos */ |
| 146 | complain_overflow_signed, /* complain_on_overflow */ |
| 147 | bfd_elf_generic_reloc, /* special_function */ |
| 148 | "R_XC16X_SEG", /* name */ |
| 149 | TRUE, /* partial_inplace */ |
| 150 | 0x00000000, /* src_mask */ |
| 151 | 0x0000ffff, /* dst_mask */ |
| 152 | FALSE), /* pcrel_offset */ |
| 153 | |
| 154 | /* Relocation regarding segment offset. */ |
| 155 | HOWTO (R_XC16X_SOF, /* type */ |
| 156 | 0, /* rightshift */ |
| 157 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 158 | 16, /* bitsize */ |
| 159 | FALSE, /* pc_relative */ |
| 160 | 0, /* bitpos */ |
| 161 | complain_overflow_signed, /* complain_on_overflow */ |
| 162 | bfd_elf_generic_reloc, /* special_function */ |
| 163 | "R_XC16X_SOF", /* name */ |
| 164 | TRUE, /* partial_inplace */ |
| 165 | 0x00000000, /* src_mask */ |
| 166 | 0x0000ffff, /* dst_mask */ |
| 167 | FALSE) /* pcrel_offset */ |
| 168 | }; |
| 169 | |
| 170 | |
| 171 | /* Map BFD reloc types to XC16X ELF reloc types. */ |
| 172 | |
| 173 | struct xc16x_reloc_map |
| 174 | { |
| 175 | bfd_reloc_code_real_type bfd_reloc_val; |
| 176 | unsigned int xc16x_reloc_val; |
| 177 | }; |
| 178 | |
| 179 | static const struct xc16x_reloc_map xc16x_reloc_map [] = |
| 180 | { |
| 181 | { BFD_RELOC_NONE, R_XC16X_NONE }, |
| 182 | { BFD_RELOC_8, R_XC16X_ABS_8 }, |
| 183 | { BFD_RELOC_16, R_XC16X_ABS_16 }, |
| 184 | { BFD_RELOC_32, R_XC16X_ABS_32 }, |
| 185 | { BFD_RELOC_8_PCREL, R_XC16X_8_PCREL }, |
| 186 | { BFD_RELOC_XC16X_PAG, R_XC16X_PAG}, |
| 187 | { BFD_RELOC_XC16X_POF, R_XC16X_POF}, |
| 188 | { BFD_RELOC_XC16X_SEG, R_XC16X_SEG}, |
| 189 | { BFD_RELOC_XC16X_SOF, R_XC16X_SOF}, |
| 190 | }; |
| 191 | |
| 192 | |
| 193 | /* This function is used to search for correct relocation type from |
| 194 | howto structure. */ |
| 195 | |
| 196 | static reloc_howto_type * |
| 197 | xc16x_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 198 | bfd_reloc_code_real_type code) |
| 199 | { |
| 200 | unsigned int i; |
| 201 | |
| 202 | for (i = ARRAY_SIZE (xc16x_reloc_map); --i;) |
| 203 | if (xc16x_reloc_map [i].bfd_reloc_val == code) |
| 204 | return & xc16x_elf_howto_table [xc16x_reloc_map[i].xc16x_reloc_val]; |
| 205 | |
| 206 | return NULL; |
| 207 | } |
| 208 | |
| 209 | static reloc_howto_type * |
| 210 | xc16x_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 211 | const char *r_name) |
| 212 | { |
| 213 | unsigned int i; |
| 214 | |
| 215 | for (i = 0; |
| 216 | i < sizeof (xc16x_elf_howto_table) / sizeof (xc16x_elf_howto_table[0]); |
| 217 | i++) |
| 218 | if (xc16x_elf_howto_table[i].name != NULL |
| 219 | && strcasecmp (xc16x_elf_howto_table[i].name, r_name) == 0) |
| 220 | return &xc16x_elf_howto_table[i]; |
| 221 | |
| 222 | return NULL; |
| 223 | } |
| 224 | |
| 225 | /* For a particular operand this function is |
| 226 | called to finalise the type of relocation. */ |
| 227 | |
| 228 | static void |
| 229 | elf32_xc16x_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc, |
| 230 | Elf_Internal_Rela *elf_reloc) |
| 231 | { |
| 232 | unsigned int r; |
| 233 | unsigned int i; |
| 234 | |
| 235 | r = ELF32_R_TYPE (elf_reloc->r_info); |
| 236 | for (i = 0; i < ARRAY_SIZE (xc16x_elf_howto_table); i++) |
| 237 | if (xc16x_elf_howto_table[i].type == r) |
| 238 | { |
| 239 | bfd_reloc->howto = &xc16x_elf_howto_table[i]; |
| 240 | return; |
| 241 | } |
| 242 | abort (); |
| 243 | } |
| 244 | |
| 245 | static bfd_reloc_status_type |
| 246 | elf32_xc16x_final_link_relocate (unsigned long r_type, |
| 247 | bfd *input_bfd, |
| 248 | bfd *output_bfd ATTRIBUTE_UNUSED, |
| 249 | asection *input_section ATTRIBUTE_UNUSED, |
| 250 | bfd_byte *contents, |
| 251 | bfd_vma offset, |
| 252 | bfd_vma value, |
| 253 | bfd_vma addend, |
| 254 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 255 | asection *sym_sec ATTRIBUTE_UNUSED, |
| 256 | int is_local ATTRIBUTE_UNUSED) |
| 257 | { |
| 258 | bfd_byte *hit_data = contents + offset; |
| 259 | bfd_vma val1; |
| 260 | |
| 261 | switch (r_type) |
| 262 | { |
| 263 | case R_XC16X_NONE: |
| 264 | return bfd_reloc_ok; |
| 265 | |
| 266 | case R_XC16X_ABS_16: |
| 267 | value += addend; |
| 268 | bfd_put_16 (input_bfd, value, hit_data); |
| 269 | return bfd_reloc_ok; |
| 270 | |
| 271 | case R_XC16X_8_PCREL: |
| 272 | bfd_put_8 (input_bfd, value, hit_data); |
| 273 | return bfd_reloc_ok; |
| 274 | |
| 275 | /* Following case is to find page number from actual |
| 276 | address for this divide value by 16k i.e. page size. */ |
| 277 | |
| 278 | case R_XC16X_PAG: |
| 279 | value += addend; |
| 280 | value /= 0x4000; |
| 281 | bfd_put_16 (input_bfd, value, hit_data); |
| 282 | return bfd_reloc_ok; |
| 283 | |
| 284 | /* Following case is to find page offset from actual address |
| 285 | for this take modulo of value by 16k i.e. page size. */ |
| 286 | |
| 287 | case R_XC16X_POF: |
| 288 | value += addend; |
| 289 | value %= 0x4000; |
| 290 | bfd_put_16 (input_bfd, value, hit_data); |
| 291 | return bfd_reloc_ok; |
| 292 | |
| 293 | /* Following case is to find segment number from actual |
| 294 | address for this divide value by 64k i.e. segment size. */ |
| 295 | |
| 296 | case R_XC16X_SEG: |
| 297 | value += addend; |
| 298 | value /= 0x10000; |
| 299 | bfd_put_16 (input_bfd, value, hit_data); |
| 300 | return bfd_reloc_ok; |
| 301 | |
| 302 | /* Following case is to find segment offset from actual address |
| 303 | for this take modulo of value by 64k i.e. segment size. */ |
| 304 | |
| 305 | case R_XC16X_SOF: |
| 306 | value += addend; |
| 307 | value %= 0x10000; |
| 308 | bfd_put_16 (input_bfd, value, hit_data); |
| 309 | return bfd_reloc_ok; |
| 310 | |
| 311 | case R_XC16X_ABS_32: |
| 312 | if (!strstr (input_section->name,".debug")) |
| 313 | { |
| 314 | value += addend; |
| 315 | val1 = value; |
| 316 | value %= 0x4000; |
| 317 | val1 /= 0x4000; |
| 318 | val1 = val1 << 16; |
| 319 | value += val1; |
| 320 | bfd_put_32 (input_bfd, value, hit_data); |
| 321 | } |
| 322 | else |
| 323 | { |
| 324 | value += addend; |
| 325 | bfd_put_32 (input_bfd, value, hit_data); |
| 326 | } |
| 327 | return bfd_reloc_ok; |
| 328 | |
| 329 | default: |
| 330 | return bfd_reloc_notsupported; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | static bfd_boolean |
| 335 | elf32_xc16x_relocate_section (bfd *output_bfd, |
| 336 | struct bfd_link_info *info, |
| 337 | bfd *input_bfd, |
| 338 | asection *input_section, |
| 339 | bfd_byte *contents, |
| 340 | Elf_Internal_Rela *relocs, |
| 341 | Elf_Internal_Sym *local_syms, |
| 342 | asection **local_sections) |
| 343 | { |
| 344 | Elf_Internal_Shdr *symtab_hdr; |
| 345 | struct elf_link_hash_entry **sym_hashes; |
| 346 | Elf_Internal_Rela *rel, *relend; |
| 347 | |
| 348 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 349 | sym_hashes = elf_sym_hashes (input_bfd); |
| 350 | |
| 351 | rel = relocs; |
| 352 | relend = relocs + input_section->reloc_count; |
| 353 | for (; rel < relend; rel++) |
| 354 | { |
| 355 | unsigned int r_type; |
| 356 | unsigned long r_symndx; |
| 357 | Elf_Internal_Sym *sym; |
| 358 | asection *sec; |
| 359 | struct elf_link_hash_entry *h; |
| 360 | bfd_vma relocation; |
| 361 | bfd_reloc_status_type r; |
| 362 | |
| 363 | /* This is a final link. */ |
| 364 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 365 | r_type = ELF32_R_TYPE (rel->r_info); |
| 366 | h = NULL; |
| 367 | sym = NULL; |
| 368 | sec = NULL; |
| 369 | if (r_symndx < symtab_hdr->sh_info) |
| 370 | { |
| 371 | sym = local_syms + r_symndx; |
| 372 | sec = local_sections[r_symndx]; |
| 373 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 374 | } |
| 375 | else |
| 376 | { |
| 377 | bfd_boolean unresolved_reloc, warned; |
| 378 | |
| 379 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 380 | r_symndx, symtab_hdr, sym_hashes, |
| 381 | h, sec, relocation, |
| 382 | unresolved_reloc, warned); |
| 383 | } |
| 384 | |
| 385 | if (sec != NULL && elf_discarded_section (sec)) |
| 386 | { |
| 387 | /* For relocs against symbols from removed linkonce sections, |
| 388 | or sections discarded by a linker script, we just want the |
| 389 | section contents zeroed. Avoid any special processing. */ |
| 390 | reloc_howto_type *howto; |
| 391 | howto = xc16x_reloc_type_lookup (input_bfd, r_type); |
| 392 | _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); |
| 393 | rel->r_info = 0; |
| 394 | rel->r_addend = 0; |
| 395 | continue; |
| 396 | } |
| 397 | |
| 398 | if (info->relocatable) |
| 399 | continue; |
| 400 | |
| 401 | r = elf32_xc16x_final_link_relocate (r_type, input_bfd, output_bfd, |
| 402 | input_section, |
| 403 | contents, rel->r_offset, |
| 404 | relocation, rel->r_addend, |
| 405 | info, sec, h == NULL); |
| 406 | } |
| 407 | |
| 408 | return TRUE; |
| 409 | } |
| 410 | |
| 411 | |
| 412 | static void |
| 413 | elf32_xc16x_final_write_processing (bfd *abfd, |
| 414 | bfd_boolean linker ATTRIBUTE_UNUSED) |
| 415 | { |
| 416 | unsigned long val; |
| 417 | |
| 418 | switch (bfd_get_mach (abfd)) |
| 419 | { |
| 420 | default: |
| 421 | case bfd_mach_xc16x: |
| 422 | val = 0x1000; |
| 423 | break; |
| 424 | |
| 425 | case bfd_mach_xc16xl: |
| 426 | val = 0x1001; |
| 427 | break; |
| 428 | |
| 429 | case bfd_mach_xc16xs: |
| 430 | val = 0x1002; |
| 431 | break; |
| 432 | } |
| 433 | |
| 434 | elf_elfheader (abfd)->e_flags |= val; |
| 435 | } |
| 436 | |
| 437 | static unsigned long |
| 438 | elf32_xc16x_mach (flagword flags) |
| 439 | { |
| 440 | switch (flags) |
| 441 | { |
| 442 | case 0x1000: |
| 443 | default: |
| 444 | return bfd_mach_xc16x; |
| 445 | |
| 446 | case 0x1001: |
| 447 | return bfd_mach_xc16xl; |
| 448 | |
| 449 | case 0x1002: |
| 450 | return bfd_mach_xc16xs; |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | |
| 455 | static bfd_boolean |
| 456 | elf32_xc16x_object_p (bfd *abfd) |
| 457 | { |
| 458 | bfd_default_set_arch_mach (abfd, bfd_arch_xc16x, |
| 459 | elf32_xc16x_mach (elf_elfheader (abfd)->e_flags)); |
| 460 | return TRUE; |
| 461 | } |
| 462 | |
| 463 | |
| 464 | #define ELF_ARCH bfd_arch_xc16x |
| 465 | #define ELF_MACHINE_CODE EM_XC16X |
| 466 | #define ELF_MAXPAGESIZE 0x100 |
| 467 | |
| 468 | #define TARGET_LITTLE_SYM bfd_elf32_xc16x_vec |
| 469 | #define TARGET_LITTLE_NAME "elf32-xc16x" |
| 470 | #define elf_backend_final_write_processing elf32_xc16x_final_write_processing |
| 471 | #define elf_backend_object_p elf32_xc16x_object_p |
| 472 | #define elf_backend_can_gc_sections 1 |
| 473 | #define bfd_elf32_bfd_reloc_type_lookup xc16x_reloc_type_lookup |
| 474 | #define bfd_elf32_bfd_reloc_name_lookup xc16x_reloc_name_lookup |
| 475 | #define elf_info_to_howto elf32_xc16x_info_to_howto |
| 476 | #define elf_info_to_howto_rel elf32_xc16x_info_to_howto |
| 477 | #define elf_backend_relocate_section elf32_xc16x_relocate_section |
| 478 | #define elf_backend_rela_normal 1 |
| 479 | |
| 480 | #include "elf32-target.h" |