| 1 | /* This module handles expression trees. |
| 2 | Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
| 3 | 2001, 2002, 2003, 2004, 2005, 2006 |
| 4 | Free Software Foundation, Inc. |
| 5 | Written by Steve Chamberlain of Cygnus Support <sac@cygnus.com>. |
| 6 | |
| 7 | This file is part of GLD, the Gnu Linker. |
| 8 | |
| 9 | GLD is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2, or (at your option) |
| 12 | any later version. |
| 13 | |
| 14 | GLD is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with GLD; see the file COPYING. If not, write to the Free |
| 21 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 22 | 02110-1301, USA. */ |
| 23 | |
| 24 | /* This module is in charge of working out the contents of expressions. |
| 25 | |
| 26 | It has to keep track of the relative/absness of a symbol etc. This |
| 27 | is done by keeping all values in a struct (an etree_value_type) |
| 28 | which contains a value, a section to which it is relative and a |
| 29 | valid bit. */ |
| 30 | |
| 31 | #include "bfd.h" |
| 32 | #include "sysdep.h" |
| 33 | #include "bfdlink.h" |
| 34 | |
| 35 | #include "ld.h" |
| 36 | #include "ldmain.h" |
| 37 | #include "ldmisc.h" |
| 38 | #include "ldexp.h" |
| 39 | #include <ldgram.h> |
| 40 | #include "ldlang.h" |
| 41 | #include "libiberty.h" |
| 42 | #include "safe-ctype.h" |
| 43 | |
| 44 | static void exp_fold_tree_1 (etree_type *); |
| 45 | static void exp_fold_tree_no_dot (etree_type *); |
| 46 | static bfd_vma align_n (bfd_vma, bfd_vma); |
| 47 | |
| 48 | segment_type *segments; |
| 49 | |
| 50 | struct ldexp_control expld; |
| 51 | |
| 52 | /* Print the string representation of the given token. Surround it |
| 53 | with spaces if INFIX_P is TRUE. */ |
| 54 | |
| 55 | static void |
| 56 | exp_print_token (token_code_type code, int infix_p) |
| 57 | { |
| 58 | static const struct |
| 59 | { |
| 60 | token_code_type code; |
| 61 | char * name; |
| 62 | } |
| 63 | table[] = |
| 64 | { |
| 65 | { INT, "int" }, |
| 66 | { NAME, "NAME" }, |
| 67 | { PLUSEQ, "+=" }, |
| 68 | { MINUSEQ, "-=" }, |
| 69 | { MULTEQ, "*=" }, |
| 70 | { DIVEQ, "/=" }, |
| 71 | { LSHIFTEQ, "<<=" }, |
| 72 | { RSHIFTEQ, ">>=" }, |
| 73 | { ANDEQ, "&=" }, |
| 74 | { OREQ, "|=" }, |
| 75 | { OROR, "||" }, |
| 76 | { ANDAND, "&&" }, |
| 77 | { EQ, "==" }, |
| 78 | { NE, "!=" }, |
| 79 | { LE, "<=" }, |
| 80 | { GE, ">=" }, |
| 81 | { LSHIFT, "<<" }, |
| 82 | { RSHIFT, ">>" }, |
| 83 | { ALIGN_K, "ALIGN" }, |
| 84 | { BLOCK, "BLOCK" }, |
| 85 | { QUAD, "QUAD" }, |
| 86 | { SQUAD, "SQUAD" }, |
| 87 | { LONG, "LONG" }, |
| 88 | { SHORT, "SHORT" }, |
| 89 | { BYTE, "BYTE" }, |
| 90 | { SECTIONS, "SECTIONS" }, |
| 91 | { SIZEOF_HEADERS, "SIZEOF_HEADERS" }, |
| 92 | { MEMORY, "MEMORY" }, |
| 93 | { DEFINED, "DEFINED" }, |
| 94 | { TARGET_K, "TARGET" }, |
| 95 | { SEARCH_DIR, "SEARCH_DIR" }, |
| 96 | { MAP, "MAP" }, |
| 97 | { ENTRY, "ENTRY" }, |
| 98 | { NEXT, "NEXT" }, |
| 99 | { SIZEOF, "SIZEOF" }, |
| 100 | { ADDR, "ADDR" }, |
| 101 | { LOADADDR, "LOADADDR" }, |
| 102 | { CONSTANT, "CONSTANT" }, |
| 103 | { MAX_K, "MAX_K" }, |
| 104 | { REL, "relocatable" }, |
| 105 | { DATA_SEGMENT_ALIGN, "DATA_SEGMENT_ALIGN" }, |
| 106 | { DATA_SEGMENT_RELRO_END, "DATA_SEGMENT_RELRO_END" }, |
| 107 | { DATA_SEGMENT_END, "DATA_SEGMENT_END" }, |
| 108 | { ORIGIN, "ORIGIN" }, |
| 109 | { LENGTH, "LENGTH" }, |
| 110 | { SEGMENT_START, "SEGMENT_START" } |
| 111 | }; |
| 112 | unsigned int idx; |
| 113 | |
| 114 | for (idx = 0; idx < ARRAY_SIZE (table); idx++) |
| 115 | if (table[idx].code == code) |
| 116 | break; |
| 117 | |
| 118 | if (infix_p) |
| 119 | fputc (' ', config.map_file); |
| 120 | |
| 121 | if (idx < ARRAY_SIZE (table)) |
| 122 | fputs (table[idx].name, config.map_file); |
| 123 | else if (code < 127) |
| 124 | fputc (code, config.map_file); |
| 125 | else |
| 126 | fprintf (config.map_file, "<code %d>", code); |
| 127 | |
| 128 | if (infix_p) |
| 129 | fputc (' ', config.map_file); |
| 130 | } |
| 131 | |
| 132 | static void |
| 133 | make_abs (void) |
| 134 | { |
| 135 | expld.result.value += expld.result.section->vma; |
| 136 | expld.result.section = bfd_abs_section_ptr; |
| 137 | } |
| 138 | |
| 139 | static void |
| 140 | new_abs (bfd_vma value) |
| 141 | { |
| 142 | expld.result.valid_p = TRUE; |
| 143 | expld.result.section = bfd_abs_section_ptr; |
| 144 | expld.result.value = value; |
| 145 | expld.result.str = NULL; |
| 146 | } |
| 147 | |
| 148 | etree_type * |
| 149 | exp_intop (bfd_vma value) |
| 150 | { |
| 151 | etree_type *new = stat_alloc (sizeof (new->value)); |
| 152 | new->type.node_code = INT; |
| 153 | new->value.value = value; |
| 154 | new->value.str = NULL; |
| 155 | new->type.node_class = etree_value; |
| 156 | return new; |
| 157 | } |
| 158 | |
| 159 | etree_type * |
| 160 | exp_bigintop (bfd_vma value, char *str) |
| 161 | { |
| 162 | etree_type *new = stat_alloc (sizeof (new->value)); |
| 163 | new->type.node_code = INT; |
| 164 | new->value.value = value; |
| 165 | new->value.str = str; |
| 166 | new->type.node_class = etree_value; |
| 167 | return new; |
| 168 | } |
| 169 | |
| 170 | /* Build an expression representing an unnamed relocatable value. */ |
| 171 | |
| 172 | etree_type * |
| 173 | exp_relop (asection *section, bfd_vma value) |
| 174 | { |
| 175 | etree_type *new = stat_alloc (sizeof (new->rel)); |
| 176 | new->type.node_code = REL; |
| 177 | new->type.node_class = etree_rel; |
| 178 | new->rel.section = section; |
| 179 | new->rel.value = value; |
| 180 | return new; |
| 181 | } |
| 182 | |
| 183 | static void |
| 184 | new_rel (bfd_vma value, char *str, asection *section) |
| 185 | { |
| 186 | expld.result.valid_p = TRUE; |
| 187 | expld.result.value = value; |
| 188 | expld.result.str = str; |
| 189 | expld.result.section = section; |
| 190 | } |
| 191 | |
| 192 | static void |
| 193 | new_rel_from_abs (bfd_vma value) |
| 194 | { |
| 195 | expld.result.valid_p = TRUE; |
| 196 | expld.result.value = value - expld.section->vma; |
| 197 | expld.result.str = NULL; |
| 198 | expld.result.section = expld.section; |
| 199 | } |
| 200 | |
| 201 | static void |
| 202 | fold_unary (etree_type *tree) |
| 203 | { |
| 204 | exp_fold_tree_1 (tree->unary.child); |
| 205 | if (expld.result.valid_p) |
| 206 | { |
| 207 | switch (tree->type.node_code) |
| 208 | { |
| 209 | case ALIGN_K: |
| 210 | if (expld.phase != lang_first_phase_enum) |
| 211 | new_rel_from_abs (align_n (expld.dot, expld.result.value)); |
| 212 | else |
| 213 | expld.result.valid_p = FALSE; |
| 214 | break; |
| 215 | |
| 216 | case ABSOLUTE: |
| 217 | make_abs (); |
| 218 | break; |
| 219 | |
| 220 | case '~': |
| 221 | make_abs (); |
| 222 | expld.result.value = ~expld.result.value; |
| 223 | break; |
| 224 | |
| 225 | case '!': |
| 226 | make_abs (); |
| 227 | expld.result.value = !expld.result.value; |
| 228 | break; |
| 229 | |
| 230 | case '-': |
| 231 | make_abs (); |
| 232 | expld.result.value = -expld.result.value; |
| 233 | break; |
| 234 | |
| 235 | case NEXT: |
| 236 | /* Return next place aligned to value. */ |
| 237 | if (expld.phase != lang_first_phase_enum) |
| 238 | { |
| 239 | make_abs (); |
| 240 | expld.result.value = align_n (expld.dot, expld.result.value); |
| 241 | } |
| 242 | else |
| 243 | expld.result.valid_p = FALSE; |
| 244 | break; |
| 245 | |
| 246 | case DATA_SEGMENT_END: |
| 247 | if (expld.phase != lang_first_phase_enum |
| 248 | && expld.section == bfd_abs_section_ptr |
| 249 | && (expld.dataseg.phase == exp_dataseg_align_seen |
| 250 | || expld.dataseg.phase == exp_dataseg_relro_seen |
| 251 | || expld.dataseg.phase == exp_dataseg_adjust |
| 252 | || expld.dataseg.phase == exp_dataseg_relro_adjust |
| 253 | || expld.phase == lang_final_phase_enum)) |
| 254 | { |
| 255 | if (expld.dataseg.phase == exp_dataseg_align_seen |
| 256 | || expld.dataseg.phase == exp_dataseg_relro_seen) |
| 257 | { |
| 258 | expld.dataseg.phase = exp_dataseg_end_seen; |
| 259 | expld.dataseg.end = expld.result.value; |
| 260 | } |
| 261 | } |
| 262 | else |
| 263 | expld.result.valid_p = FALSE; |
| 264 | break; |
| 265 | |
| 266 | default: |
| 267 | FAIL (); |
| 268 | break; |
| 269 | } |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | static void |
| 274 | fold_binary (etree_type *tree) |
| 275 | { |
| 276 | exp_fold_tree_1 (tree->binary.lhs); |
| 277 | |
| 278 | /* The SEGMENT_START operator is special because its first |
| 279 | operand is a string, not the name of a symbol. */ |
| 280 | if (expld.result.valid_p && tree->type.node_code == SEGMENT_START) |
| 281 | { |
| 282 | const char *segment_name; |
| 283 | segment_type *seg; |
| 284 | /* Check to see if the user has overridden the default |
| 285 | value. */ |
| 286 | segment_name = tree->binary.rhs->name.name; |
| 287 | for (seg = segments; seg; seg = seg->next) |
| 288 | if (strcmp (seg->name, segment_name) == 0) |
| 289 | { |
| 290 | seg->used = TRUE; |
| 291 | expld.result.value = seg->value; |
| 292 | expld.result.str = NULL; |
| 293 | expld.result.section = NULL; |
| 294 | break; |
| 295 | } |
| 296 | } |
| 297 | else if (expld.result.valid_p) |
| 298 | { |
| 299 | etree_value_type lhs = expld.result; |
| 300 | |
| 301 | exp_fold_tree_1 (tree->binary.rhs); |
| 302 | if (expld.result.valid_p) |
| 303 | { |
| 304 | /* If the values are from different sections, or this is an |
| 305 | absolute expression, make both the source arguments |
| 306 | absolute. However, adding or subtracting an absolute |
| 307 | value from a relative value is meaningful, and is an |
| 308 | exception. */ |
| 309 | if (expld.section != bfd_abs_section_ptr |
| 310 | && lhs.section == bfd_abs_section_ptr |
| 311 | && tree->type.node_code == '+') |
| 312 | { |
| 313 | /* Keep the section of the rhs term. */ |
| 314 | expld.result.value = lhs.value + expld.result.value; |
| 315 | return; |
| 316 | } |
| 317 | else if (expld.section != bfd_abs_section_ptr |
| 318 | && expld.result.section == bfd_abs_section_ptr |
| 319 | && (tree->type.node_code == '+' |
| 320 | || tree->type.node_code == '-')) |
| 321 | { |
| 322 | /* Keep the section of the lhs term. */ |
| 323 | expld.result.section = lhs.section; |
| 324 | } |
| 325 | else if (expld.result.section != lhs.section |
| 326 | || expld.section == bfd_abs_section_ptr) |
| 327 | { |
| 328 | make_abs (); |
| 329 | lhs.value += lhs.section->vma; |
| 330 | } |
| 331 | |
| 332 | switch (tree->type.node_code) |
| 333 | { |
| 334 | case '%': |
| 335 | if (expld.result.value != 0) |
| 336 | expld.result.value = ((bfd_signed_vma) lhs.value |
| 337 | % (bfd_signed_vma) expld.result.value); |
| 338 | else if (expld.phase != lang_mark_phase_enum) |
| 339 | einfo (_("%F%S %% by zero\n")); |
| 340 | break; |
| 341 | |
| 342 | case '/': |
| 343 | if (expld.result.value != 0) |
| 344 | expld.result.value = ((bfd_signed_vma) lhs.value |
| 345 | / (bfd_signed_vma) expld.result.value); |
| 346 | else if (expld.phase != lang_mark_phase_enum) |
| 347 | einfo (_("%F%S / by zero\n")); |
| 348 | break; |
| 349 | |
| 350 | #define BOP(x, y) \ |
| 351 | case x: \ |
| 352 | expld.result.value = lhs.value y expld.result.value; \ |
| 353 | break; |
| 354 | |
| 355 | BOP ('+', +); |
| 356 | BOP ('*', *); |
| 357 | BOP ('-', -); |
| 358 | BOP (LSHIFT, <<); |
| 359 | BOP (RSHIFT, >>); |
| 360 | BOP (EQ, ==); |
| 361 | BOP (NE, !=); |
| 362 | BOP ('<', <); |
| 363 | BOP ('>', >); |
| 364 | BOP (LE, <=); |
| 365 | BOP (GE, >=); |
| 366 | BOP ('&', &); |
| 367 | BOP ('^', ^); |
| 368 | BOP ('|', |); |
| 369 | BOP (ANDAND, &&); |
| 370 | BOP (OROR, ||); |
| 371 | |
| 372 | case MAX_K: |
| 373 | if (lhs.value > expld.result.value) |
| 374 | expld.result.value = lhs.value; |
| 375 | break; |
| 376 | |
| 377 | case MIN_K: |
| 378 | if (lhs.value < expld.result.value) |
| 379 | expld.result.value = lhs.value; |
| 380 | break; |
| 381 | |
| 382 | case ALIGN_K: |
| 383 | expld.result.value = align_n (lhs.value, expld.result.value); |
| 384 | break; |
| 385 | |
| 386 | case DATA_SEGMENT_ALIGN: |
| 387 | if (expld.phase != lang_first_phase_enum |
| 388 | && expld.section == bfd_abs_section_ptr |
| 389 | && (expld.dataseg.phase == exp_dataseg_none |
| 390 | || expld.dataseg.phase == exp_dataseg_adjust |
| 391 | || expld.dataseg.phase == exp_dataseg_relro_adjust |
| 392 | || expld.phase == lang_final_phase_enum)) |
| 393 | { |
| 394 | bfd_vma maxpage = lhs.value; |
| 395 | bfd_vma commonpage = expld.result.value; |
| 396 | |
| 397 | expld.result.value = align_n (expld.dot, maxpage); |
| 398 | if (expld.dataseg.phase == exp_dataseg_relro_adjust) |
| 399 | expld.result.value = expld.dataseg.base; |
| 400 | else if (expld.dataseg.phase != exp_dataseg_adjust) |
| 401 | { |
| 402 | expld.result.value += expld.dot & (maxpage - 1); |
| 403 | if (expld.phase == lang_allocating_phase_enum) |
| 404 | { |
| 405 | expld.dataseg.phase = exp_dataseg_align_seen; |
| 406 | expld.dataseg.min_base = align_n (expld.dot, maxpage); |
| 407 | expld.dataseg.base = expld.result.value; |
| 408 | expld.dataseg.pagesize = commonpage; |
| 409 | expld.dataseg.maxpagesize = maxpage; |
| 410 | expld.dataseg.relro_end = 0; |
| 411 | } |
| 412 | } |
| 413 | else if (commonpage < maxpage) |
| 414 | expld.result.value += ((expld.dot + commonpage - 1) |
| 415 | & (maxpage - commonpage)); |
| 416 | } |
| 417 | else |
| 418 | expld.result.valid_p = FALSE; |
| 419 | break; |
| 420 | |
| 421 | case DATA_SEGMENT_RELRO_END: |
| 422 | if (expld.phase != lang_first_phase_enum |
| 423 | && (expld.dataseg.phase == exp_dataseg_align_seen |
| 424 | || expld.dataseg.phase == exp_dataseg_adjust |
| 425 | || expld.dataseg.phase == exp_dataseg_relro_adjust |
| 426 | || expld.phase == lang_final_phase_enum)) |
| 427 | { |
| 428 | if (expld.dataseg.phase == exp_dataseg_align_seen |
| 429 | || expld.dataseg.phase == exp_dataseg_relro_adjust) |
| 430 | expld.dataseg.relro_end = lhs.value + expld.result.value; |
| 431 | |
| 432 | if (expld.dataseg.phase == exp_dataseg_relro_adjust |
| 433 | && (expld.dataseg.relro_end |
| 434 | & (expld.dataseg.pagesize - 1))) |
| 435 | { |
| 436 | expld.dataseg.relro_end += expld.dataseg.pagesize - 1; |
| 437 | expld.dataseg.relro_end &= ~(expld.dataseg.pagesize - 1); |
| 438 | expld.result.value = (expld.dataseg.relro_end |
| 439 | - expld.result.value); |
| 440 | } |
| 441 | else |
| 442 | expld.result.value = lhs.value; |
| 443 | |
| 444 | if (expld.dataseg.phase == exp_dataseg_align_seen) |
| 445 | expld.dataseg.phase = exp_dataseg_relro_seen; |
| 446 | } |
| 447 | else |
| 448 | expld.result.valid_p = FALSE; |
| 449 | break; |
| 450 | |
| 451 | default: |
| 452 | FAIL (); |
| 453 | } |
| 454 | } |
| 455 | else |
| 456 | expld.result.valid_p = FALSE; |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | static void |
| 461 | fold_trinary (etree_type *tree) |
| 462 | { |
| 463 | exp_fold_tree_1 (tree->trinary.cond); |
| 464 | if (expld.result.valid_p) |
| 465 | exp_fold_tree_1 (expld.result.value |
| 466 | ? tree->trinary.lhs |
| 467 | : tree->trinary.rhs); |
| 468 | } |
| 469 | |
| 470 | static void |
| 471 | fold_name (etree_type *tree) |
| 472 | { |
| 473 | memset (&expld.result, 0, sizeof (expld.result)); |
| 474 | |
| 475 | switch (tree->type.node_code) |
| 476 | { |
| 477 | case SIZEOF_HEADERS: |
| 478 | if (expld.phase != lang_first_phase_enum) |
| 479 | { |
| 480 | bfd_vma hdr_size = 0; |
| 481 | /* Don't find the real header size if only marking sections; |
| 482 | The bfd function may cache incorrect data. */ |
| 483 | if (expld.phase != lang_mark_phase_enum) |
| 484 | hdr_size = bfd_sizeof_headers (output_bfd, link_info.relocatable); |
| 485 | new_abs (hdr_size); |
| 486 | } |
| 487 | break; |
| 488 | case DEFINED: |
| 489 | if (expld.phase == lang_first_phase_enum) |
| 490 | lang_track_definedness (tree->name.name); |
| 491 | else |
| 492 | { |
| 493 | struct bfd_link_hash_entry *h; |
| 494 | int def_iteration |
| 495 | = lang_symbol_definition_iteration (tree->name.name); |
| 496 | |
| 497 | h = bfd_wrapped_link_hash_lookup (output_bfd, &link_info, |
| 498 | tree->name.name, |
| 499 | FALSE, FALSE, TRUE); |
| 500 | expld.result.value = (h != NULL |
| 501 | && (h->type == bfd_link_hash_defined |
| 502 | || h->type == bfd_link_hash_defweak |
| 503 | || h->type == bfd_link_hash_common) |
| 504 | && (def_iteration == lang_statement_iteration |
| 505 | || def_iteration == -1)); |
| 506 | expld.result.section = bfd_abs_section_ptr; |
| 507 | expld.result.valid_p = TRUE; |
| 508 | } |
| 509 | break; |
| 510 | case NAME: |
| 511 | if (expld.phase == lang_first_phase_enum) |
| 512 | ; |
| 513 | else if (tree->name.name[0] == '.' && tree->name.name[1] == 0) |
| 514 | new_rel_from_abs (expld.dot); |
| 515 | else |
| 516 | { |
| 517 | struct bfd_link_hash_entry *h; |
| 518 | |
| 519 | h = bfd_wrapped_link_hash_lookup (output_bfd, &link_info, |
| 520 | tree->name.name, |
| 521 | TRUE, FALSE, TRUE); |
| 522 | if (!h) |
| 523 | einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n")); |
| 524 | else if (h->type == bfd_link_hash_defined |
| 525 | || h->type == bfd_link_hash_defweak) |
| 526 | { |
| 527 | if (bfd_is_abs_section (h->u.def.section)) |
| 528 | new_abs (h->u.def.value); |
| 529 | else |
| 530 | { |
| 531 | asection *output_section; |
| 532 | |
| 533 | output_section = h->u.def.section->output_section; |
| 534 | if (output_section == NULL) |
| 535 | { |
| 536 | if (expld.phase != lang_mark_phase_enum) |
| 537 | einfo (_("%X%S: unresolvable symbol `%s'" |
| 538 | " referenced in expression\n"), |
| 539 | tree->name.name); |
| 540 | } |
| 541 | else |
| 542 | new_rel (h->u.def.value + h->u.def.section->output_offset, |
| 543 | NULL, output_section); |
| 544 | } |
| 545 | } |
| 546 | else if (expld.phase == lang_final_phase_enum |
| 547 | || expld.assigning_to_dot) |
| 548 | einfo (_("%F%S: undefined symbol `%s' referenced in expression\n"), |
| 549 | tree->name.name); |
| 550 | else if (h->type == bfd_link_hash_new) |
| 551 | { |
| 552 | h->type = bfd_link_hash_undefined; |
| 553 | h->u.undef.abfd = NULL; |
| 554 | if (h->u.undef.next == NULL && h != link_info.hash->undefs_tail) |
| 555 | bfd_link_add_undef (link_info.hash, h); |
| 556 | } |
| 557 | } |
| 558 | break; |
| 559 | |
| 560 | case ADDR: |
| 561 | if (expld.phase != lang_first_phase_enum) |
| 562 | { |
| 563 | lang_output_section_statement_type *os; |
| 564 | |
| 565 | os = lang_output_section_find (tree->name.name); |
| 566 | if (os != NULL && os->processed) |
| 567 | new_rel (0, NULL, os->bfd_section); |
| 568 | } |
| 569 | break; |
| 570 | |
| 571 | case LOADADDR: |
| 572 | if (expld.phase != lang_first_phase_enum) |
| 573 | { |
| 574 | lang_output_section_statement_type *os; |
| 575 | |
| 576 | os = lang_output_section_find (tree->name.name); |
| 577 | if (os != NULL && os->processed) |
| 578 | { |
| 579 | if (os->load_base == NULL) |
| 580 | new_rel (0, NULL, os->bfd_section); |
| 581 | else |
| 582 | exp_fold_tree_1 (os->load_base); |
| 583 | } |
| 584 | } |
| 585 | break; |
| 586 | |
| 587 | case SIZEOF: |
| 588 | if (expld.phase != lang_first_phase_enum) |
| 589 | { |
| 590 | int opb = bfd_octets_per_byte (output_bfd); |
| 591 | lang_output_section_statement_type *os; |
| 592 | |
| 593 | os = lang_output_section_find (tree->name.name); |
| 594 | if (os == NULL) |
| 595 | new_abs (0); |
| 596 | else if (os->processed) |
| 597 | new_abs (os->bfd_section->size / opb); |
| 598 | } |
| 599 | break; |
| 600 | |
| 601 | case LENGTH: |
| 602 | { |
| 603 | lang_memory_region_type *mem; |
| 604 | |
| 605 | mem = lang_memory_region_lookup (tree->name.name, FALSE); |
| 606 | if (mem != NULL) |
| 607 | new_abs (mem->length); |
| 608 | else |
| 609 | einfo (_("%F%S: undefined MEMORY region `%s'" |
| 610 | " referenced in expression\n"), tree->name.name); |
| 611 | } |
| 612 | break; |
| 613 | |
| 614 | case ORIGIN: |
| 615 | { |
| 616 | lang_memory_region_type *mem; |
| 617 | |
| 618 | mem = lang_memory_region_lookup (tree->name.name, FALSE); |
| 619 | if (mem != NULL) |
| 620 | new_abs (mem->origin); |
| 621 | else |
| 622 | einfo (_("%F%S: undefined MEMORY region `%s'" |
| 623 | " referenced in expression\n"), tree->name.name); |
| 624 | } |
| 625 | break; |
| 626 | |
| 627 | case CONSTANT: |
| 628 | if (strcmp (tree->name.name, "MAXPAGESIZE") == 0) |
| 629 | new_abs (bfd_emul_get_maxpagesize (default_target)); |
| 630 | else if (strcmp (tree->name.name, "COMMONPAGESIZE") == 0) |
| 631 | new_abs (bfd_emul_get_commonpagesize (default_target)); |
| 632 | else |
| 633 | einfo (_("%F%S: unknown constant `%s' referenced in expression\n"), |
| 634 | tree->name.name); |
| 635 | break; |
| 636 | |
| 637 | default: |
| 638 | FAIL (); |
| 639 | break; |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | static void |
| 644 | exp_fold_tree_1 (etree_type *tree) |
| 645 | { |
| 646 | if (tree == NULL) |
| 647 | { |
| 648 | memset (&expld.result, 0, sizeof (expld.result)); |
| 649 | return; |
| 650 | } |
| 651 | |
| 652 | switch (tree->type.node_class) |
| 653 | { |
| 654 | case etree_value: |
| 655 | new_rel (tree->value.value, tree->value.str, expld.section); |
| 656 | break; |
| 657 | |
| 658 | case etree_rel: |
| 659 | if (expld.phase != lang_first_phase_enum) |
| 660 | { |
| 661 | asection *output_section = tree->rel.section->output_section; |
| 662 | new_rel (tree->rel.value + tree->rel.section->output_offset, |
| 663 | NULL, output_section); |
| 664 | } |
| 665 | else |
| 666 | memset (&expld.result, 0, sizeof (expld.result)); |
| 667 | break; |
| 668 | |
| 669 | case etree_assert: |
| 670 | exp_fold_tree_1 (tree->assert_s.child); |
| 671 | if (expld.phase == lang_final_phase_enum && !expld.result.value) |
| 672 | einfo ("%X%P: %s\n", tree->assert_s.message); |
| 673 | break; |
| 674 | |
| 675 | case etree_unary: |
| 676 | fold_unary (tree); |
| 677 | break; |
| 678 | |
| 679 | case etree_binary: |
| 680 | fold_binary (tree); |
| 681 | break; |
| 682 | |
| 683 | case etree_trinary: |
| 684 | fold_trinary (tree); |
| 685 | break; |
| 686 | |
| 687 | case etree_assign: |
| 688 | case etree_provide: |
| 689 | case etree_provided: |
| 690 | if (tree->assign.dst[0] == '.' && tree->assign.dst[1] == 0) |
| 691 | { |
| 692 | /* Assignment to dot can only be done during allocation. */ |
| 693 | if (tree->type.node_class != etree_assign) |
| 694 | einfo (_("%F%S can not PROVIDE assignment to location counter\n")); |
| 695 | if (expld.phase == lang_mark_phase_enum |
| 696 | || expld.phase == lang_allocating_phase_enum |
| 697 | || (expld.phase == lang_final_phase_enum |
| 698 | && expld.section == bfd_abs_section_ptr)) |
| 699 | { |
| 700 | /* Notify the folder that this is an assignment to dot. */ |
| 701 | expld.assigning_to_dot = TRUE; |
| 702 | exp_fold_tree_1 (tree->assign.src); |
| 703 | expld.assigning_to_dot = FALSE; |
| 704 | |
| 705 | if (!expld.result.valid_p) |
| 706 | { |
| 707 | if (expld.phase != lang_mark_phase_enum) |
| 708 | einfo (_("%F%S invalid assignment to location counter\n")); |
| 709 | } |
| 710 | else if (expld.dotp == NULL) |
| 711 | einfo (_("%F%S assignment to location counter" |
| 712 | " invalid outside of SECTION\n")); |
| 713 | else |
| 714 | { |
| 715 | bfd_vma nextdot; |
| 716 | |
| 717 | nextdot = expld.result.value + expld.section->vma; |
| 718 | if (nextdot < expld.dot |
| 719 | && expld.section != bfd_abs_section_ptr) |
| 720 | einfo (_("%F%S cannot move location counter backwards" |
| 721 | " (from %V to %V)\n"), expld.dot, nextdot); |
| 722 | else |
| 723 | { |
| 724 | expld.dot = nextdot; |
| 725 | *expld.dotp = nextdot; |
| 726 | } |
| 727 | } |
| 728 | } |
| 729 | else |
| 730 | memset (&expld.result, 0, sizeof (expld.result)); |
| 731 | } |
| 732 | else |
| 733 | { |
| 734 | struct bfd_link_hash_entry *h = NULL; |
| 735 | |
| 736 | if (tree->type.node_class == etree_provide) |
| 737 | { |
| 738 | h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst, |
| 739 | FALSE, FALSE, TRUE); |
| 740 | if (h == NULL |
| 741 | || (h->type != bfd_link_hash_new |
| 742 | && h->type != bfd_link_hash_undefined |
| 743 | && h->type != bfd_link_hash_common)) |
| 744 | { |
| 745 | /* Do nothing. The symbol was never referenced, or was |
| 746 | defined by some object. */ |
| 747 | break; |
| 748 | } |
| 749 | } |
| 750 | |
| 751 | exp_fold_tree_1 (tree->assign.src); |
| 752 | if (expld.result.valid_p) |
| 753 | { |
| 754 | if (h == NULL) |
| 755 | { |
| 756 | h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst, |
| 757 | TRUE, FALSE, TRUE); |
| 758 | if (h == NULL) |
| 759 | einfo (_("%P%F:%s: hash creation failed\n"), |
| 760 | tree->assign.dst); |
| 761 | } |
| 762 | |
| 763 | /* FIXME: Should we worry if the symbol is already |
| 764 | defined? */ |
| 765 | lang_update_definedness (tree->assign.dst, h); |
| 766 | h->type = bfd_link_hash_defined; |
| 767 | h->u.def.value = expld.result.value; |
| 768 | h->u.def.section = expld.result.section; |
| 769 | if (tree->type.node_class == etree_provide) |
| 770 | tree->type.node_class = etree_provided; |
| 771 | } |
| 772 | } |
| 773 | break; |
| 774 | |
| 775 | case etree_name: |
| 776 | fold_name (tree); |
| 777 | break; |
| 778 | |
| 779 | default: |
| 780 | FAIL (); |
| 781 | memset (&expld.result, 0, sizeof (expld.result)); |
| 782 | break; |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | void |
| 787 | exp_fold_tree (etree_type *tree, asection *current_section, bfd_vma *dotp) |
| 788 | { |
| 789 | expld.dot = *dotp; |
| 790 | expld.dotp = dotp; |
| 791 | expld.section = current_section; |
| 792 | exp_fold_tree_1 (tree); |
| 793 | } |
| 794 | |
| 795 | static void |
| 796 | exp_fold_tree_no_dot (etree_type *tree) |
| 797 | { |
| 798 | expld.dot = 0; |
| 799 | expld.dotp = NULL; |
| 800 | expld.section = bfd_abs_section_ptr; |
| 801 | exp_fold_tree_1 (tree); |
| 802 | } |
| 803 | |
| 804 | etree_type * |
| 805 | exp_binop (int code, etree_type *lhs, etree_type *rhs) |
| 806 | { |
| 807 | etree_type value, *new; |
| 808 | |
| 809 | value.type.node_code = code; |
| 810 | value.binary.lhs = lhs; |
| 811 | value.binary.rhs = rhs; |
| 812 | value.type.node_class = etree_binary; |
| 813 | exp_fold_tree_no_dot (&value); |
| 814 | if (expld.result.valid_p) |
| 815 | return exp_intop (expld.result.value); |
| 816 | |
| 817 | new = stat_alloc (sizeof (new->binary)); |
| 818 | memcpy (new, &value, sizeof (new->binary)); |
| 819 | return new; |
| 820 | } |
| 821 | |
| 822 | etree_type * |
| 823 | exp_trinop (int code, etree_type *cond, etree_type *lhs, etree_type *rhs) |
| 824 | { |
| 825 | etree_type value, *new; |
| 826 | |
| 827 | value.type.node_code = code; |
| 828 | value.trinary.lhs = lhs; |
| 829 | value.trinary.cond = cond; |
| 830 | value.trinary.rhs = rhs; |
| 831 | value.type.node_class = etree_trinary; |
| 832 | exp_fold_tree_no_dot (&value); |
| 833 | if (expld.result.valid_p) |
| 834 | return exp_intop (expld.result.value); |
| 835 | |
| 836 | new = stat_alloc (sizeof (new->trinary)); |
| 837 | memcpy (new, &value, sizeof (new->trinary)); |
| 838 | return new; |
| 839 | } |
| 840 | |
| 841 | etree_type * |
| 842 | exp_unop (int code, etree_type *child) |
| 843 | { |
| 844 | etree_type value, *new; |
| 845 | |
| 846 | value.unary.type.node_code = code; |
| 847 | value.unary.child = child; |
| 848 | value.unary.type.node_class = etree_unary; |
| 849 | exp_fold_tree_no_dot (&value); |
| 850 | if (expld.result.valid_p) |
| 851 | return exp_intop (expld.result.value); |
| 852 | |
| 853 | new = stat_alloc (sizeof (new->unary)); |
| 854 | memcpy (new, &value, sizeof (new->unary)); |
| 855 | return new; |
| 856 | } |
| 857 | |
| 858 | etree_type * |
| 859 | exp_nameop (int code, const char *name) |
| 860 | { |
| 861 | etree_type value, *new; |
| 862 | |
| 863 | value.name.type.node_code = code; |
| 864 | value.name.name = name; |
| 865 | value.name.type.node_class = etree_name; |
| 866 | |
| 867 | exp_fold_tree_no_dot (&value); |
| 868 | if (expld.result.valid_p) |
| 869 | return exp_intop (expld.result.value); |
| 870 | |
| 871 | new = stat_alloc (sizeof (new->name)); |
| 872 | memcpy (new, &value, sizeof (new->name)); |
| 873 | return new; |
| 874 | |
| 875 | } |
| 876 | |
| 877 | etree_type * |
| 878 | exp_assop (int code, const char *dst, etree_type *src) |
| 879 | { |
| 880 | etree_type *new; |
| 881 | |
| 882 | new = stat_alloc (sizeof (new->assign)); |
| 883 | new->type.node_code = code; |
| 884 | new->type.node_class = etree_assign; |
| 885 | new->assign.src = src; |
| 886 | new->assign.dst = dst; |
| 887 | return new; |
| 888 | } |
| 889 | |
| 890 | /* Handle PROVIDE. */ |
| 891 | |
| 892 | etree_type * |
| 893 | exp_provide (const char *dst, etree_type *src, bfd_boolean hidden) |
| 894 | { |
| 895 | etree_type *n; |
| 896 | |
| 897 | n = stat_alloc (sizeof (n->assign)); |
| 898 | n->assign.type.node_code = '='; |
| 899 | n->assign.type.node_class = etree_provide; |
| 900 | n->assign.src = src; |
| 901 | n->assign.dst = dst; |
| 902 | n->assign.hidden = hidden; |
| 903 | return n; |
| 904 | } |
| 905 | |
| 906 | /* Handle ASSERT. */ |
| 907 | |
| 908 | etree_type * |
| 909 | exp_assert (etree_type *exp, const char *message) |
| 910 | { |
| 911 | etree_type *n; |
| 912 | |
| 913 | n = stat_alloc (sizeof (n->assert_s)); |
| 914 | n->assert_s.type.node_code = '!'; |
| 915 | n->assert_s.type.node_class = etree_assert; |
| 916 | n->assert_s.child = exp; |
| 917 | n->assert_s.message = message; |
| 918 | return n; |
| 919 | } |
| 920 | |
| 921 | void |
| 922 | exp_print_tree (etree_type *tree) |
| 923 | { |
| 924 | if (config.map_file == NULL) |
| 925 | config.map_file = stderr; |
| 926 | |
| 927 | if (tree == NULL) |
| 928 | { |
| 929 | minfo ("NULL TREE\n"); |
| 930 | return; |
| 931 | } |
| 932 | |
| 933 | switch (tree->type.node_class) |
| 934 | { |
| 935 | case etree_value: |
| 936 | minfo ("0x%v", tree->value.value); |
| 937 | return; |
| 938 | case etree_rel: |
| 939 | if (tree->rel.section->owner != NULL) |
| 940 | minfo ("%B:", tree->rel.section->owner); |
| 941 | minfo ("%s+0x%v", tree->rel.section->name, tree->rel.value); |
| 942 | return; |
| 943 | case etree_assign: |
| 944 | fprintf (config.map_file, "%s", tree->assign.dst); |
| 945 | exp_print_token (tree->type.node_code, TRUE); |
| 946 | exp_print_tree (tree->assign.src); |
| 947 | break; |
| 948 | case etree_provide: |
| 949 | case etree_provided: |
| 950 | fprintf (config.map_file, "PROVIDE (%s, ", tree->assign.dst); |
| 951 | exp_print_tree (tree->assign.src); |
| 952 | fprintf (config.map_file, ")"); |
| 953 | break; |
| 954 | case etree_binary: |
| 955 | fprintf (config.map_file, "("); |
| 956 | exp_print_tree (tree->binary.lhs); |
| 957 | exp_print_token (tree->type.node_code, TRUE); |
| 958 | exp_print_tree (tree->binary.rhs); |
| 959 | fprintf (config.map_file, ")"); |
| 960 | break; |
| 961 | case etree_trinary: |
| 962 | exp_print_tree (tree->trinary.cond); |
| 963 | fprintf (config.map_file, "?"); |
| 964 | exp_print_tree (tree->trinary.lhs); |
| 965 | fprintf (config.map_file, ":"); |
| 966 | exp_print_tree (tree->trinary.rhs); |
| 967 | break; |
| 968 | case etree_unary: |
| 969 | exp_print_token (tree->unary.type.node_code, FALSE); |
| 970 | if (tree->unary.child) |
| 971 | { |
| 972 | fprintf (config.map_file, " ("); |
| 973 | exp_print_tree (tree->unary.child); |
| 974 | fprintf (config.map_file, ")"); |
| 975 | } |
| 976 | break; |
| 977 | |
| 978 | case etree_assert: |
| 979 | fprintf (config.map_file, "ASSERT ("); |
| 980 | exp_print_tree (tree->assert_s.child); |
| 981 | fprintf (config.map_file, ", %s)", tree->assert_s.message); |
| 982 | break; |
| 983 | |
| 984 | case etree_name: |
| 985 | if (tree->type.node_code == NAME) |
| 986 | { |
| 987 | fprintf (config.map_file, "%s", tree->name.name); |
| 988 | } |
| 989 | else |
| 990 | { |
| 991 | exp_print_token (tree->type.node_code, FALSE); |
| 992 | if (tree->name.name) |
| 993 | fprintf (config.map_file, " (%s)", tree->name.name); |
| 994 | } |
| 995 | break; |
| 996 | default: |
| 997 | FAIL (); |
| 998 | break; |
| 999 | } |
| 1000 | } |
| 1001 | |
| 1002 | bfd_vma |
| 1003 | exp_get_vma (etree_type *tree, bfd_vma def, char *name) |
| 1004 | { |
| 1005 | if (tree != NULL) |
| 1006 | { |
| 1007 | exp_fold_tree_no_dot (tree); |
| 1008 | if (expld.result.valid_p) |
| 1009 | return expld.result.value; |
| 1010 | else if (name != NULL && expld.phase != lang_mark_phase_enum) |
| 1011 | einfo (_("%F%S nonconstant expression for %s\n"), name); |
| 1012 | } |
| 1013 | return def; |
| 1014 | } |
| 1015 | |
| 1016 | int |
| 1017 | exp_get_value_int (etree_type *tree, int def, char *name) |
| 1018 | { |
| 1019 | return exp_get_vma (tree, def, name); |
| 1020 | } |
| 1021 | |
| 1022 | fill_type * |
| 1023 | exp_get_fill (etree_type *tree, fill_type *def, char *name) |
| 1024 | { |
| 1025 | fill_type *fill; |
| 1026 | size_t len; |
| 1027 | unsigned int val; |
| 1028 | |
| 1029 | if (tree == NULL) |
| 1030 | return def; |
| 1031 | |
| 1032 | exp_fold_tree_no_dot (tree); |
| 1033 | if (!expld.result.valid_p) |
| 1034 | { |
| 1035 | if (name != NULL && expld.phase != lang_mark_phase_enum) |
| 1036 | einfo (_("%F%S nonconstant expression for %s\n"), name); |
| 1037 | return def; |
| 1038 | } |
| 1039 | |
| 1040 | if (expld.result.str != NULL && (len = strlen (expld.result.str)) != 0) |
| 1041 | { |
| 1042 | unsigned char *dst; |
| 1043 | unsigned char *s; |
| 1044 | fill = xmalloc ((len + 1) / 2 + sizeof (*fill) - 1); |
| 1045 | fill->size = (len + 1) / 2; |
| 1046 | dst = fill->data; |
| 1047 | s = (unsigned char *) expld.result.str; |
| 1048 | val = 0; |
| 1049 | do |
| 1050 | { |
| 1051 | unsigned int digit; |
| 1052 | |
| 1053 | digit = *s++ - '0'; |
| 1054 | if (digit > 9) |
| 1055 | digit = (digit - 'A' + '0' + 10) & 0xf; |
| 1056 | val <<= 4; |
| 1057 | val += digit; |
| 1058 | --len; |
| 1059 | if ((len & 1) == 0) |
| 1060 | { |
| 1061 | *dst++ = val; |
| 1062 | val = 0; |
| 1063 | } |
| 1064 | } |
| 1065 | while (len != 0); |
| 1066 | } |
| 1067 | else |
| 1068 | { |
| 1069 | fill = xmalloc (4 + sizeof (*fill) - 1); |
| 1070 | val = expld.result.value; |
| 1071 | fill->data[0] = (val >> 24) & 0xff; |
| 1072 | fill->data[1] = (val >> 16) & 0xff; |
| 1073 | fill->data[2] = (val >> 8) & 0xff; |
| 1074 | fill->data[3] = (val >> 0) & 0xff; |
| 1075 | fill->size = 4; |
| 1076 | } |
| 1077 | return fill; |
| 1078 | } |
| 1079 | |
| 1080 | bfd_vma |
| 1081 | exp_get_abs_int (etree_type *tree, int def, char *name) |
| 1082 | { |
| 1083 | if (tree != NULL) |
| 1084 | { |
| 1085 | exp_fold_tree_no_dot (tree); |
| 1086 | |
| 1087 | if (expld.result.valid_p) |
| 1088 | { |
| 1089 | expld.result.value += expld.result.section->vma; |
| 1090 | return expld.result.value; |
| 1091 | } |
| 1092 | else if (name != NULL && expld.phase != lang_mark_phase_enum) |
| 1093 | einfo (_("%F%S nonconstant expression for %s\n"), name); |
| 1094 | } |
| 1095 | return def; |
| 1096 | } |
| 1097 | |
| 1098 | static bfd_vma |
| 1099 | align_n (bfd_vma value, bfd_vma align) |
| 1100 | { |
| 1101 | if (align <= 1) |
| 1102 | return value; |
| 1103 | |
| 1104 | value = (value + align - 1) / align; |
| 1105 | return value * align; |
| 1106 | } |