| 1 | /* write.c - emit .o file |
| 2 | Copyright (C) 1986, 1987, 1990, 1991, 1992, 1993 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GAS, the GNU Assembler. |
| 5 | |
| 6 | GAS is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GAS is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GAS; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | /* This thing should be set up to do byteordering correctly. But... */ |
| 21 | |
| 22 | #include "as.h" |
| 23 | #include "subsegs.h" |
| 24 | #include "obstack.h" |
| 25 | #include "output-file.h" |
| 26 | |
| 27 | /* The NOP_OPCODE is for the alignment fill value. Fill it with a nop |
| 28 | instruction so that the disassembler does not choke on it. */ |
| 29 | #ifndef NOP_OPCODE |
| 30 | #define NOP_OPCODE 0x00 |
| 31 | #endif |
| 32 | |
| 33 | #ifndef WORKING_DOT_WORD |
| 34 | extern CONST int md_short_jump_size; |
| 35 | extern CONST int md_long_jump_size; |
| 36 | #endif |
| 37 | |
| 38 | #ifndef BFD_ASSEMBLER |
| 39 | |
| 40 | #ifndef MANY_SEGMENTS |
| 41 | struct frag *text_frag_root; |
| 42 | struct frag *data_frag_root; |
| 43 | struct frag *bss_frag_root; |
| 44 | |
| 45 | struct frag *text_last_frag; /* Last frag in segment. */ |
| 46 | struct frag *data_last_frag; /* Last frag in segment. */ |
| 47 | static struct frag *bss_last_frag; /* Last frag in segment. */ |
| 48 | #endif |
| 49 | |
| 50 | static object_headers headers; |
| 51 | long string_byte_count; |
| 52 | static char *the_object_file; |
| 53 | char *next_object_file_charP; /* Tracks object file bytes. */ |
| 54 | |
| 55 | #ifndef OBJ_VMS |
| 56 | int magic_number_for_object_file = DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE; |
| 57 | #endif |
| 58 | |
| 59 | #endif /* BFD_ASSEMBLER */ |
| 60 | |
| 61 | #ifdef BFD_ASSEMBLER |
| 62 | static fixS *fix_new_internal PARAMS ((fragS *, int where, int size, |
| 63 | symbolS *add, symbolS *sub, |
| 64 | offsetT offset, int pcrel, |
| 65 | bfd_reloc_code_real_type r_type)); |
| 66 | #else |
| 67 | static fixS *fix_new_internal PARAMS ((fragS *, int where, int size, |
| 68 | symbolS *add, symbolS *sub, |
| 69 | offsetT offset, int pcrel, |
| 70 | int r_type)); |
| 71 | #endif |
| 72 | static long fixup_segment PARAMS ((fixS * fixP, segT this_segment_type)); |
| 73 | static relax_addressT relax_align PARAMS ((relax_addressT addr, int align)); |
| 74 | void relax_segment PARAMS ((struct frag * seg_frag_root, segT seg_type)); |
| 75 | |
| 76 | /* |
| 77 | * fix_new() |
| 78 | * |
| 79 | * Create a fixS in obstack 'notes'. |
| 80 | */ |
| 81 | static fixS * |
| 82 | fix_new_internal (frag, where, size, add_symbol, sub_symbol, offset, pcrel, |
| 83 | r_type) |
| 84 | fragS *frag; /* Which frag? */ |
| 85 | int where; /* Where in that frag? */ |
| 86 | int size; /* 1, 2, or 4 usually. */ |
| 87 | symbolS *add_symbol; /* X_add_symbol. */ |
| 88 | symbolS *sub_symbol; /* X_op_symbol. */ |
| 89 | offsetT offset; /* X_add_number. */ |
| 90 | int pcrel; /* TRUE if PC-relative relocation. */ |
| 91 | #ifdef BFD_ASSEMBLER |
| 92 | bfd_reloc_code_real_type r_type; /* Relocation type */ |
| 93 | #else |
| 94 | int r_type; /* Relocation type */ |
| 95 | #endif |
| 96 | { |
| 97 | fixS *fixP; |
| 98 | |
| 99 | fixP = (fixS *) obstack_alloc (¬es, sizeof (fixS)); |
| 100 | |
| 101 | fixP->fx_frag = frag; |
| 102 | fixP->fx_where = where; |
| 103 | fixP->fx_size = size; |
| 104 | fixP->fx_addsy = add_symbol; |
| 105 | fixP->fx_subsy = sub_symbol; |
| 106 | fixP->fx_offset = offset; |
| 107 | fixP->fx_pcrel = pcrel; |
| 108 | #if defined(NEED_FX_R_TYPE) || defined (BFD_ASSEMBLER) |
| 109 | fixP->fx_r_type = r_type; |
| 110 | #endif |
| 111 | fixP->fx_im_disp = 0; |
| 112 | fixP->fx_pcrel_adjust = 0; |
| 113 | fixP->fx_bit_fixP = 0; |
| 114 | fixP->fx_addnumber = 0; |
| 115 | |
| 116 | #ifdef TC_something |
| 117 | fixP->fx_bsr = 0; |
| 118 | #endif |
| 119 | #ifdef TC_I960 |
| 120 | fixP->fx_callj = 0; |
| 121 | #endif |
| 122 | |
| 123 | /* Usually, we want relocs sorted numerically, but while |
| 124 | comparing to older versions of gas that have relocs |
| 125 | reverse sorted, it is convenient to have this compile |
| 126 | time option. xoxorich. */ |
| 127 | |
| 128 | { |
| 129 | |
| 130 | #ifdef BFD_ASSEMBLER |
| 131 | fixS **seg_fix_rootP = & (seg_info (now_seg)->fix_root); |
| 132 | fixS **seg_fix_tailP = & (seg_info (now_seg)->fix_tail); |
| 133 | #endif |
| 134 | |
| 135 | #ifdef REVERSE_SORT_RELOCS |
| 136 | |
| 137 | fixP->fx_next = *seg_fix_rootP; |
| 138 | *seg_fix_rootP = fixP; |
| 139 | |
| 140 | #else /* REVERSE_SORT_RELOCS */ |
| 141 | |
| 142 | fixP->fx_next = NULL; |
| 143 | |
| 144 | if (*seg_fix_tailP) |
| 145 | (*seg_fix_tailP)->fx_next = fixP; |
| 146 | else |
| 147 | *seg_fix_rootP = fixP; |
| 148 | *seg_fix_tailP = fixP; |
| 149 | |
| 150 | #endif /* REVERSE_SORT_RELOCS */ |
| 151 | |
| 152 | } |
| 153 | |
| 154 | return fixP; |
| 155 | } |
| 156 | |
| 157 | /* Create a fixup relative to a symbol (plus a constant). */ |
| 158 | |
| 159 | fixS * |
| 160 | fix_new (frag, where, size, add_symbol, offset, pcrel, r_type) |
| 161 | fragS *frag; /* Which frag? */ |
| 162 | int where; /* Where in that frag? */ |
| 163 | short int size; /* 1, 2, or 4 usually. */ |
| 164 | symbolS *add_symbol; /* X_add_symbol. */ |
| 165 | offsetT offset; /* X_add_number. */ |
| 166 | int pcrel; /* TRUE if PC-relative relocation. */ |
| 167 | #ifdef BFD_ASSEMBLER |
| 168 | bfd_reloc_code_real_type r_type; /* Relocation type */ |
| 169 | #else |
| 170 | int r_type; /* Relocation type */ |
| 171 | #endif |
| 172 | { |
| 173 | return fix_new_internal (frag, where, size, add_symbol, |
| 174 | (symbolS *) NULL, offset, pcrel, r_type); |
| 175 | } |
| 176 | |
| 177 | /* Create a fixup for an expression. Currently we only support fixups |
| 178 | for difference expressions. That is itself more than most object |
| 179 | file formats support anyhow. */ |
| 180 | |
| 181 | fixS * |
| 182 | fix_new_exp (frag, where, size, exp, pcrel, r_type) |
| 183 | fragS *frag; /* Which frag? */ |
| 184 | int where; /* Where in that frag? */ |
| 185 | short int size; /* 1, 2, or 4 usually. */ |
| 186 | expressionS *exp; /* Expression. */ |
| 187 | int pcrel; /* TRUE if PC-relative relocation. */ |
| 188 | #ifdef BFD_ASSEMBLER |
| 189 | bfd_reloc_code_real_type r_type; /* Relocation type */ |
| 190 | #else |
| 191 | int r_type; /* Relocation type */ |
| 192 | #endif |
| 193 | { |
| 194 | symbolS *add = NULL; |
| 195 | symbolS *sub = NULL; |
| 196 | offsetT off = 0; |
| 197 | |
| 198 | switch (exp->X_op) |
| 199 | { |
| 200 | case O_absent: |
| 201 | break; |
| 202 | |
| 203 | case O_uminus: |
| 204 | sub = exp->X_add_symbol; |
| 205 | off = exp->X_add_number; |
| 206 | break; |
| 207 | |
| 208 | case O_subtract: |
| 209 | sub = exp->X_op_symbol; |
| 210 | /* Fall through. */ |
| 211 | case O_symbol: |
| 212 | add = exp->X_add_symbol; |
| 213 | /* Fall through. */ |
| 214 | case O_constant: |
| 215 | off = exp->X_add_number; |
| 216 | break; |
| 217 | |
| 218 | default: |
| 219 | as_bad ("expression too complex for fixup"); |
| 220 | } |
| 221 | |
| 222 | return fix_new_internal (frag, where, size, add, sub, off, |
| 223 | pcrel, r_type); |
| 224 | } |
| 225 | |
| 226 | /* Append a string onto another string, bumping the pointer along. */ |
| 227 | void |
| 228 | append (charPP, fromP, length) |
| 229 | char **charPP; |
| 230 | char *fromP; |
| 231 | unsigned long length; |
| 232 | { |
| 233 | /* Don't trust memcpy() of 0 chars. */ |
| 234 | if (length == 0) |
| 235 | return; |
| 236 | |
| 237 | memcpy (*charPP, fromP, (int) length); |
| 238 | *charPP += length; |
| 239 | } |
| 240 | |
| 241 | #ifndef BFD_ASSEMBLER |
| 242 | int section_alignment[SEG_MAXIMUM_ORDINAL]; |
| 243 | #endif |
| 244 | |
| 245 | /* |
| 246 | * This routine records the largest alignment seen for each segment. |
| 247 | * If the beginning of the segment is aligned on the worst-case |
| 248 | * boundary, all of the other alignments within it will work. At |
| 249 | * least one object format really uses this info. |
| 250 | */ |
| 251 | void |
| 252 | record_alignment (seg, align) |
| 253 | /* Segment to which alignment pertains */ |
| 254 | segT seg; |
| 255 | /* Alignment, as a power of 2 (e.g., 1 => 2-byte boundary, 2 => 4-byte |
| 256 | boundary, etc.) */ |
| 257 | int align; |
| 258 | { |
| 259 | #ifdef BFD_ASSEMBLER |
| 260 | if (align > bfd_get_section_alignment (stdoutput, seg)) |
| 261 | bfd_set_section_alignment (stdoutput, seg, align); |
| 262 | #else |
| 263 | if (align > section_alignment[(int) seg]) |
| 264 | section_alignment[(int) seg] = align; |
| 265 | #endif |
| 266 | } |
| 267 | |
| 268 | #if defined (BFD_ASSEMBLER) || ! defined (BFD) |
| 269 | |
| 270 | static fragS * |
| 271 | chain_frchains_together_1 (section, frchp) |
| 272 | segT section; |
| 273 | struct frchain *frchp; |
| 274 | { |
| 275 | fragS dummy, *prev_frag = &dummy; |
| 276 | for (; frchp && frchp->frch_seg == section; frchp = frchp->frch_next) |
| 277 | { |
| 278 | prev_frag->fr_next = frchp->frch_root; |
| 279 | prev_frag = frchp->frch_last; |
| 280 | } |
| 281 | prev_frag->fr_next = 0; |
| 282 | return prev_frag; |
| 283 | } |
| 284 | |
| 285 | #endif |
| 286 | |
| 287 | #ifdef BFD_ASSEMBLER |
| 288 | |
| 289 | static void |
| 290 | chain_frchains_together (abfd, section, xxx) |
| 291 | bfd *abfd; /* unused */ |
| 292 | segT section; |
| 293 | char *xxx; /* unused */ |
| 294 | { |
| 295 | segment_info_type *info; |
| 296 | |
| 297 | /* BFD may have introduced its own sections without using |
| 298 | subseg_new, so it is possible that seg_info is NULL. */ |
| 299 | info = seg_info (section); |
| 300 | if (info != (segment_info_type *) NULL) |
| 301 | chain_frchains_together_1 (section, info->frchainP); |
| 302 | } |
| 303 | |
| 304 | #endif |
| 305 | |
| 306 | #if !defined (BFD) && !defined (BFD_ASSEMBLER) |
| 307 | |
| 308 | void |
| 309 | remove_subsegs (head, seg, root, last) |
| 310 | frchainS *head; |
| 311 | int seg; |
| 312 | fragS **root; |
| 313 | fragS **last; |
| 314 | { |
| 315 | *root = head->frch_root; |
| 316 | *last = chain_frchains_together_1 (seg, head); |
| 317 | } |
| 318 | |
| 319 | #endif /* BFD */ |
| 320 | |
| 321 | #ifdef BFD_ASSEMBLER |
| 322 | static void |
| 323 | cvt_frag_to_fill (sec, fragP) |
| 324 | segT sec; |
| 325 | fragS *fragP; |
| 326 | #else |
| 327 | static void |
| 328 | cvt_frag_to_fill (headers, fragP) |
| 329 | object_headers *headers; |
| 330 | fragS *fragP; |
| 331 | #endif |
| 332 | { |
| 333 | switch (fragP->fr_type) |
| 334 | { |
| 335 | case rs_align: |
| 336 | case rs_org: |
| 337 | #ifdef HANDLE_ALIGN |
| 338 | HANDLE_ALIGN (fragP); |
| 339 | #endif |
| 340 | fragP->fr_type = rs_fill; |
| 341 | know (fragP->fr_var == 1); |
| 342 | know (fragP->fr_next != NULL); |
| 343 | |
| 344 | fragP->fr_offset = (fragP->fr_next->fr_address |
| 345 | - fragP->fr_address |
| 346 | - fragP->fr_fix); |
| 347 | break; |
| 348 | |
| 349 | case rs_fill: |
| 350 | break; |
| 351 | |
| 352 | case rs_machine_dependent: |
| 353 | #ifdef BFD_ASSEMBLER |
| 354 | md_convert_frag (stdoutput, sec, fragP); |
| 355 | #else |
| 356 | md_convert_frag (headers, fragP); |
| 357 | #endif |
| 358 | |
| 359 | assert (fragP->fr_next == NULL || (fragP->fr_next->fr_address - fragP->fr_address == fragP->fr_fix)); |
| 360 | |
| 361 | /* |
| 362 | * After md_convert_frag, we make the frag into a ".space 0". |
| 363 | * Md_convert_frag() should set up any fixSs and constants |
| 364 | * required. |
| 365 | */ |
| 366 | frag_wane (fragP); |
| 367 | break; |
| 368 | |
| 369 | #ifndef WORKING_DOT_WORD |
| 370 | case rs_broken_word: |
| 371 | { |
| 372 | struct broken_word *lie; |
| 373 | |
| 374 | if (fragP->fr_subtype) |
| 375 | { |
| 376 | fragP->fr_fix += md_short_jump_size; |
| 377 | for (lie = (struct broken_word *) (fragP->fr_symbol); |
| 378 | lie && lie->dispfrag == fragP; |
| 379 | lie = lie->next_broken_word) |
| 380 | if (lie->added == 1) |
| 381 | fragP->fr_fix += md_long_jump_size; |
| 382 | } |
| 383 | frag_wane (fragP); |
| 384 | } |
| 385 | break; |
| 386 | #endif |
| 387 | |
| 388 | default: |
| 389 | BAD_CASE (fragP->fr_type); |
| 390 | break; |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | #ifdef BFD_ASSEMBLER |
| 395 | static void |
| 396 | relax_and_size_seg (abfd, sec, xxx) |
| 397 | bfd *abfd; |
| 398 | asection *sec; |
| 399 | char *xxx; |
| 400 | { |
| 401 | flagword flags; |
| 402 | fragS *fragp; |
| 403 | segment_info_type *seginfo; |
| 404 | int x; |
| 405 | valueT size, newsize; |
| 406 | |
| 407 | flags = bfd_get_section_flags (abfd, sec); |
| 408 | |
| 409 | seginfo = (segment_info_type *) bfd_get_section_userdata (abfd, sec); |
| 410 | if (seginfo && seginfo->frchainP) |
| 411 | { |
| 412 | relax_segment (seginfo->frchainP->frch_root, sec); |
| 413 | for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next) |
| 414 | cvt_frag_to_fill (sec, fragp); |
| 415 | for (fragp = seginfo->frchainP->frch_root; |
| 416 | fragp->fr_next; |
| 417 | fragp = fragp->fr_next) |
| 418 | /* walk to last elt */; |
| 419 | size = fragp->fr_address + fragp->fr_fix; |
| 420 | } |
| 421 | else |
| 422 | size = 0; |
| 423 | if (size > 0) |
| 424 | { |
| 425 | flags |= SEC_HAS_CONTENTS; |
| 426 | /* @@ This is just an approximation. */ |
| 427 | if (seginfo->fix_root) |
| 428 | flags |= SEC_RELOC; |
| 429 | else |
| 430 | flags &= ~SEC_RELOC; |
| 431 | x = bfd_set_section_flags (abfd, sec, flags); |
| 432 | assert (x == true); |
| 433 | } |
| 434 | size = md_section_align (sec, size); |
| 435 | x = bfd_set_section_size (abfd, sec, size); |
| 436 | assert (x == true); |
| 437 | |
| 438 | /* If the size had to be rounded up, add some padding in the last |
| 439 | non-empty frag. */ |
| 440 | newsize = bfd_get_section_size_before_reloc (sec); |
| 441 | assert (newsize >= size); |
| 442 | if (size != newsize) |
| 443 | { |
| 444 | fragS *last = seginfo->frchainP->frch_last; |
| 445 | fragp = seginfo->frchainP->frch_root; |
| 446 | while (fragp->fr_next != last) |
| 447 | fragp = fragp->fr_next; |
| 448 | last->fr_address = size; |
| 449 | fragp->fr_offset += newsize - size; |
| 450 | } |
| 451 | |
| 452 | #ifdef tc_frob_section |
| 453 | tc_frob_section (sec); |
| 454 | #endif |
| 455 | #ifdef obj_frob_section |
| 456 | obj_frob_section (sec); |
| 457 | #endif |
| 458 | } |
| 459 | |
| 460 | #ifdef DEBUG2 |
| 461 | static void |
| 462 | dump_section_relocs (abfd, sec, stream_) |
| 463 | bfd *abfd; |
| 464 | asection *sec; |
| 465 | char *stream_; |
| 466 | { |
| 467 | FILE *stream = (FILE *) stream_; |
| 468 | segment_info_type *seginfo = seg_info (sec); |
| 469 | fixS *fixp = seginfo->fix_root; |
| 470 | |
| 471 | if (!fixp) |
| 472 | return; |
| 473 | |
| 474 | fprintf (stream, "sec %s relocs:\n", sec->name); |
| 475 | while (fixp) |
| 476 | { |
| 477 | symbolS *s = fixp->fx_addsy; |
| 478 | if (s) |
| 479 | fprintf (stream, " %08x: %s(%s+%x)+%x\n", fixp, |
| 480 | S_GET_NAME (s), s->bsym->section->name, |
| 481 | S_GET_VALUE (s), fixp->fx_offset); |
| 482 | else |
| 483 | fprintf (stream, " %08x: type %d no sym\n", fixp, fixp->fx_r_type); |
| 484 | fixp = fixp->fx_next; |
| 485 | } |
| 486 | } |
| 487 | #else |
| 488 | #define dump_section_relocs(ABFD,SEC,STREAM) (void)(ABFD,SEC,STREAM) |
| 489 | #endif |
| 490 | |
| 491 | static void |
| 492 | adjust_reloc_syms (abfd, sec, xxx) |
| 493 | bfd *abfd; |
| 494 | asection *sec; |
| 495 | char *xxx; |
| 496 | { |
| 497 | segment_info_type *seginfo = seg_info (sec); |
| 498 | fixS *fixp; |
| 499 | |
| 500 | if (seginfo == NULL) |
| 501 | return; |
| 502 | |
| 503 | dump_section_relocs (abfd, sec, stderr); |
| 504 | |
| 505 | for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next) |
| 506 | if (fixp->fx_addsy) |
| 507 | { |
| 508 | symbolS *sym = fixp->fx_addsy; |
| 509 | asection *symsec = sym->bsym->section; |
| 510 | segment_info_type *symseginfo = seg_info (symsec); |
| 511 | |
| 512 | /* If it's one of these sections, assume the symbol is definitely |
| 513 | going to be output. */ |
| 514 | if (symsec == &bfd_und_section |
| 515 | || symsec == &bfd_abs_section |
| 516 | || bfd_is_com_section (symsec)) |
| 517 | continue; |
| 518 | |
| 519 | /* Since we're reducing to section symbols, don't attempt to reduce |
| 520 | anything that's already using one. */ |
| 521 | if (sym->bsym == symsec->symbol) |
| 522 | continue; |
| 523 | |
| 524 | /* Is there some other reason we can't adjust this one? (E.g., |
| 525 | call/bal links in i960-bout symbols.) */ |
| 526 | #ifdef obj_fix_adjustable |
| 527 | if (! obj_fix_adjustable (fixp)) |
| 528 | continue; |
| 529 | #endif |
| 530 | /* If the section symbol isn't going to be output, the relocs |
| 531 | at least should still work. If not, figure out what to do |
| 532 | when we run into that case. */ |
| 533 | fixp->fx_offset += S_GET_VALUE (sym); |
| 534 | if (sym->sy_frag) |
| 535 | fixp->fx_offset += sym->sy_frag->fr_address; |
| 536 | if (symseginfo->sym) |
| 537 | fixp->fx_addsy = symseginfo->sym; |
| 538 | else |
| 539 | { |
| 540 | fixp->fx_addsy = symbol_find (symsec->name); |
| 541 | if (!fixp->fx_addsy) |
| 542 | { |
| 543 | fixp->fx_addsy = symbol_make (symsec->name); |
| 544 | fixp->fx_addsy->bsym = symsec->symbol; |
| 545 | } |
| 546 | symseginfo->sym = fixp->fx_addsy; |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | dump_section_relocs (abfd, sec, stderr); |
| 551 | } |
| 552 | |
| 553 | static void |
| 554 | write_relocs (abfd, sec, xxx) |
| 555 | bfd *abfd; |
| 556 | asection *sec; |
| 557 | char *xxx; |
| 558 | { |
| 559 | segment_info_type *seginfo = seg_info (sec); |
| 560 | int i, n; |
| 561 | arelent **relocs; |
| 562 | fixS *fixp; |
| 563 | |
| 564 | /* If seginfo is NULL, we did not create this section; don't do |
| 565 | anything with it. */ |
| 566 | if (seginfo == NULL) |
| 567 | return; |
| 568 | |
| 569 | fixup_segment (seginfo->fix_root, sec); |
| 570 | |
| 571 | n = 0; |
| 572 | for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next) |
| 573 | n++; |
| 574 | |
| 575 | #ifndef RELOC_EXPANSION_POSSIBLE |
| 576 | /* Set up reloc information as well. */ |
| 577 | relocs = (arelent **) bfd_alloc_by_size_t (stdoutput, |
| 578 | n * sizeof (arelent *)); |
| 579 | memset ((char*)relocs, 0, n * sizeof (arelent*)); |
| 580 | |
| 581 | i = 0; |
| 582 | for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next) |
| 583 | { |
| 584 | arelent *reloc; |
| 585 | extern arelent *tc_gen_reloc (); |
| 586 | char *data; |
| 587 | bfd_reloc_status_type s; |
| 588 | |
| 589 | if (fixp->fx_addsy == 0) |
| 590 | { |
| 591 | /* @@ Need some other flag to indicate which have already |
| 592 | been performed... */ |
| 593 | n--; |
| 594 | continue; |
| 595 | } |
| 596 | reloc = tc_gen_reloc (sec, fixp); |
| 597 | if (!reloc) |
| 598 | { |
| 599 | n--; |
| 600 | continue; |
| 601 | } |
| 602 | data = fixp->fx_frag->fr_literal + fixp->fx_where; |
| 603 | /* @@ Assumes max size of reloc is 4. */ |
| 604 | if (fixp->fx_where + 4 |
| 605 | > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset) |
| 606 | abort (); |
| 607 | /* Pass bogus address so that when bfd_perform_relocation adds |
| 608 | `address' back in, it'll come up with `data', which is where |
| 609 | we want it to operate. */ |
| 610 | s = bfd_perform_relocation (stdoutput, reloc, data - reloc->address, |
| 611 | sec, stdoutput); |
| 612 | switch (s) |
| 613 | { |
| 614 | case bfd_reloc_ok: |
| 615 | break; |
| 616 | default: |
| 617 | as_fatal ("bad return from bfd_perform_relocation"); |
| 618 | } |
| 619 | relocs[i++] = reloc; |
| 620 | } |
| 621 | #else |
| 622 | n = n * MAX_RELOC_EXPANSION; |
| 623 | /* Set up reloc information as well. */ |
| 624 | relocs = (arelent **) bfd_alloc_by_size_t (stdoutput, |
| 625 | n * sizeof (arelent *)); |
| 626 | |
| 627 | i = 0; |
| 628 | for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next) |
| 629 | { |
| 630 | arelent **reloc; |
| 631 | extern arelent **tc_gen_reloc (); |
| 632 | char *data; |
| 633 | bfd_reloc_status_type s; |
| 634 | int j; |
| 635 | |
| 636 | if (fixp->fx_addsy == 0) |
| 637 | { |
| 638 | /* @@ Need some other flag to indicate which have already |
| 639 | been performed... */ |
| 640 | n--; |
| 641 | continue; |
| 642 | } |
| 643 | reloc = tc_gen_reloc (sec, fixp); |
| 644 | |
| 645 | for (j = 0; reloc[j]; j++) |
| 646 | { |
| 647 | relocs[i++] = reloc[j]; |
| 648 | assert(i <= n); |
| 649 | } |
| 650 | data = fixp->fx_frag->fr_literal + fixp->fx_where; |
| 651 | if (fixp->fx_where + 4 |
| 652 | > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset) |
| 653 | abort (); |
| 654 | for (j = 0; reloc[j]; j++) |
| 655 | { |
| 656 | s = bfd_perform_relocation (stdoutput, reloc[j], data - reloc[j]->address, |
| 657 | sec, stdoutput); |
| 658 | switch (s) |
| 659 | { |
| 660 | case bfd_reloc_ok: |
| 661 | break; |
| 662 | default: |
| 663 | as_fatal ("bad return from bfd_perform_relocation"); |
| 664 | } |
| 665 | } |
| 666 | } |
| 667 | n = i; |
| 668 | #endif |
| 669 | |
| 670 | if (n) |
| 671 | bfd_set_reloc (stdoutput, sec, relocs, n); |
| 672 | else |
| 673 | bfd_set_section_flags (abfd, sec, |
| 674 | bfd_get_section_flags (abfd, sec) & ~SEC_RELOC); |
| 675 | #ifdef DEBUG2 |
| 676 | { |
| 677 | int i; |
| 678 | arelent *r; |
| 679 | asymbol *s; |
| 680 | fprintf (stderr, "relocs for sec %s\n", sec->name); |
| 681 | for (i = 0; i < n; i++) |
| 682 | { |
| 683 | r = relocs[i]; |
| 684 | s = *r->sym_ptr_ptr; |
| 685 | fprintf (stderr, " reloc %2d @%08x off %4x : sym %-10s addend %x\n", |
| 686 | i, r, r->address, s->name, r->addend); |
| 687 | } |
| 688 | } |
| 689 | #endif |
| 690 | } |
| 691 | |
| 692 | static void |
| 693 | write_contents (abfd, sec, xxx) |
| 694 | bfd *abfd; |
| 695 | asection *sec; |
| 696 | char *xxx; |
| 697 | { |
| 698 | segment_info_type *seginfo = seg_info (sec); |
| 699 | unsigned long offset = 0; |
| 700 | fragS *frags; |
| 701 | |
| 702 | /* Write out the frags. */ |
| 703 | if (! (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS)) |
| 704 | return; |
| 705 | |
| 706 | for (frags = seginfo->frchainP->frch_root; |
| 707 | frags; |
| 708 | frags = frags->fr_next) |
| 709 | { |
| 710 | int x; |
| 711 | unsigned long fill_size; |
| 712 | char *fill_literal; |
| 713 | long count; |
| 714 | |
| 715 | assert (frags->fr_type == rs_fill); |
| 716 | if (frags->fr_fix) |
| 717 | { |
| 718 | x = bfd_set_section_contents (stdoutput, sec, |
| 719 | frags->fr_literal, offset, |
| 720 | frags->fr_fix); |
| 721 | assert (x == true); |
| 722 | offset += frags->fr_fix; |
| 723 | } |
| 724 | fill_literal = frags->fr_literal + frags->fr_fix; |
| 725 | fill_size = frags->fr_var; |
| 726 | count = frags->fr_offset; |
| 727 | assert (count >= 0); |
| 728 | if (fill_size && count) |
| 729 | while (count--) |
| 730 | { |
| 731 | x = bfd_set_section_contents (stdoutput, sec, |
| 732 | fill_literal, offset, |
| 733 | (bfd_size_type) fill_size); |
| 734 | assert (x == true); |
| 735 | offset += fill_size; |
| 736 | } |
| 737 | } |
| 738 | } |
| 739 | #endif |
| 740 | |
| 741 | #if defined(BFD_ASSEMBLER) || !defined (BFD) |
| 742 | static void |
| 743 | merge_data_into_text () |
| 744 | { |
| 745 | #if defined(BFD_ASSEMBLER) || defined(MANY_SEGMENTS) |
| 746 | seg_info (text_section)->frchainP->frch_last->fr_next = |
| 747 | seg_info (data_section)->frchainP->frch_root; |
| 748 | seg_info (text_section)->frchainP->frch_last = |
| 749 | seg_info (data_section)->frchainP->frch_last; |
| 750 | seg_info (data_section)->frchainP = 0; |
| 751 | #else |
| 752 | fixS *tmp; |
| 753 | |
| 754 | text_last_frag->fr_next = data_frag_root; |
| 755 | text_last_frag = data_last_frag; |
| 756 | data_last_frag = NULL; |
| 757 | data_frag_root = NULL; |
| 758 | if (text_fix_root) |
| 759 | { |
| 760 | for (tmp = text_fix_root; tmp->fx_next; tmp = tmp->fx_next);; |
| 761 | tmp->fx_next = data_fix_root; |
| 762 | text_fix_tail = data_fix_tail; |
| 763 | } |
| 764 | else |
| 765 | text_fix_root = data_fix_root; |
| 766 | data_fix_root = NULL; |
| 767 | #endif |
| 768 | } |
| 769 | #endif /* BFD_ASSEMBLER || ! BFD */ |
| 770 | |
| 771 | #if !defined (BFD_ASSEMBLER) && !defined (BFD) |
| 772 | static void |
| 773 | relax_and_size_all_segments () |
| 774 | { |
| 775 | fragS *fragP; |
| 776 | |
| 777 | relax_segment (text_frag_root, SEG_TEXT); |
| 778 | relax_segment (data_frag_root, SEG_DATA); |
| 779 | relax_segment (bss_frag_root, SEG_BSS); |
| 780 | /* |
| 781 | * Now the addresses of frags are correct within the segment. |
| 782 | */ |
| 783 | |
| 784 | know (text_last_frag->fr_type == rs_fill && text_last_frag->fr_offset == 0); |
| 785 | H_SET_TEXT_SIZE (&headers, text_last_frag->fr_address); |
| 786 | text_last_frag->fr_address = H_GET_TEXT_SIZE (&headers); |
| 787 | |
| 788 | /* |
| 789 | * Join the 2 segments into 1 huge segment. |
| 790 | * To do this, re-compute every rn_address in the SEG_DATA frags. |
| 791 | * Then join the data frags after the text frags. |
| 792 | * |
| 793 | * Determine a_data [length of data segment]. |
| 794 | */ |
| 795 | if (data_frag_root) |
| 796 | { |
| 797 | register relax_addressT slide; |
| 798 | |
| 799 | know ((text_last_frag->fr_type == rs_fill) && (text_last_frag->fr_offset == 0)); |
| 800 | |
| 801 | H_SET_DATA_SIZE (&headers, data_last_frag->fr_address); |
| 802 | data_last_frag->fr_address = H_GET_DATA_SIZE (&headers); |
| 803 | slide = H_GET_TEXT_SIZE (&headers); /* & in file of the data segment. */ |
| 804 | #ifdef OBJ_BOUT |
| 805 | #define RoundUp(N,S) (((N)+(S)-1)&-(S)) |
| 806 | /* For b.out: If the data section has a strict alignment |
| 807 | requirement, its load address in the .o file will be |
| 808 | rounded up from the size of the text section. These |
| 809 | two values are *not* the same! Similarly for the bss |
| 810 | section.... */ |
| 811 | slide = RoundUp (slide, 1 << section_alignment[SEG_DATA]); |
| 812 | #endif |
| 813 | |
| 814 | for (fragP = data_frag_root; fragP; fragP = fragP->fr_next) |
| 815 | { |
| 816 | fragP->fr_address += slide; |
| 817 | } /* for each data frag */ |
| 818 | |
| 819 | know (text_last_frag != 0); |
| 820 | text_last_frag->fr_next = data_frag_root; |
| 821 | } |
| 822 | else |
| 823 | { |
| 824 | H_SET_DATA_SIZE (&headers, 0); |
| 825 | } |
| 826 | |
| 827 | #ifdef OBJ_BOUT |
| 828 | /* See above comments on b.out data section address. */ |
| 829 | { |
| 830 | long bss_vma; |
| 831 | if (data_last_frag == 0) |
| 832 | bss_vma = H_GET_TEXT_SIZE (&headers); |
| 833 | else |
| 834 | bss_vma = data_last_frag->fr_address; |
| 835 | bss_vma = RoundUp (bss_vma, 1 << section_alignment[SEG_BSS]); |
| 836 | bss_address_frag.fr_address = bss_vma; |
| 837 | } |
| 838 | #else /* ! OBJ_BOUT */ |
| 839 | bss_address_frag.fr_address = (H_GET_TEXT_SIZE (&headers) + |
| 840 | H_GET_DATA_SIZE (&headers)); |
| 841 | |
| 842 | |
| 843 | /* Slide all the frags */ |
| 844 | if (bss_frag_root) |
| 845 | { |
| 846 | relax_addressT slide = bss_address_frag.fr_address; |
| 847 | |
| 848 | for (fragP = bss_frag_root; fragP; fragP = fragP->fr_next) |
| 849 | { |
| 850 | fragP->fr_address += slide; |
| 851 | } /* for each bss frag */ |
| 852 | } |
| 853 | |
| 854 | #endif /* ! OBJ_BOUT */ |
| 855 | |
| 856 | if (bss_last_frag) |
| 857 | H_SET_BSS_SIZE (&headers, |
| 858 | bss_last_frag->fr_address - bss_frag_root->fr_address); |
| 859 | else |
| 860 | H_SET_BSS_SIZE (&headers, 0); |
| 861 | } |
| 862 | #endif /* ! BFD_ASSEMBLER && ! BFD */ |
| 863 | |
| 864 | #if defined (BFD_ASSEMBLER) || !defined (BFD) |
| 865 | |
| 866 | void |
| 867 | write_object_file () |
| 868 | { |
| 869 | register struct frchain *frchainP; /* Track along all frchains. */ |
| 870 | #if ! defined (BFD_ASSEMBLER) || ! defined (WORKING_DOT_WORD) |
| 871 | register fragS *fragP; /* Track along all frags. */ |
| 872 | #endif |
| 873 | #if !defined (BFD_ASSEMBLER) && !defined (OBJ_VMS) |
| 874 | long object_file_size; |
| 875 | #endif |
| 876 | |
| 877 | /* Do we really want to write it? */ |
| 878 | { |
| 879 | int n_warns, n_errs; |
| 880 | n_warns = had_warnings (); |
| 881 | n_errs = had_errors (); |
| 882 | /* The -Z flag indicates that an object file should be generated, |
| 883 | regardless of warnings and errors. */ |
| 884 | if (flagseen['Z']) |
| 885 | { |
| 886 | if (n_warns || n_errs) |
| 887 | as_warn ("%d error%s, %d warning%s, generating bad object file.\n", |
| 888 | n_errs, n_errs == 1 ? "" : "s", |
| 889 | n_warns, n_warns == 1 ? "" : "s"); |
| 890 | } |
| 891 | else |
| 892 | { |
| 893 | if (n_errs) |
| 894 | as_fatal ("%d error%s, %d warning%s, no object file generated.\n", |
| 895 | n_errs, n_errs == 1 ? "" : "s", |
| 896 | n_warns, n_warns == 1 ? "" : "s"); |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | #ifdef OBJ_VMS |
| 901 | /* |
| 902 | * Under VMS we try to be compatible with VAX-11 "C". Thus, we |
| 903 | * call a routine to check for the definition of the procedure |
| 904 | * "_main", and if so -- fix it up so that it can be program |
| 905 | * entry point. |
| 906 | */ |
| 907 | VMS_Check_For_Main (); |
| 908 | #endif /* VMS */ |
| 909 | |
| 910 | /* After every sub-segment, we fake an ".align ...". This conforms to |
| 911 | BSD4.2 brane-damage. We then fake ".fill 0" because that is the kind of |
| 912 | frag that requires least thought. ".align" frags like to have a |
| 913 | following frag since that makes calculating their intended length |
| 914 | trivial. |
| 915 | |
| 916 | @@ Is this really necessary?? */ |
| 917 | #ifndef SUB_SEGMENT_ALIGN |
| 918 | #ifdef BFD_ASSEMBLER |
| 919 | #define SUB_SEGMENT_ALIGN(SEG) (0) |
| 920 | #else |
| 921 | #define SUB_SEGMENT_ALIGN(SEG) (2) |
| 922 | #endif |
| 923 | #endif |
| 924 | for (frchainP = frchain_root; frchainP; frchainP = frchainP->frch_next) |
| 925 | { |
| 926 | #ifdef BFD_ASSEMBLER |
| 927 | subseg_set (frchainP->frch_seg, frchainP->frch_subseg); |
| 928 | #else |
| 929 | subseg_new (frchainP->frch_seg, frchainP->frch_subseg); |
| 930 | #endif |
| 931 | frag_align (SUB_SEGMENT_ALIGN (now_seg), NOP_OPCODE); |
| 932 | /* frag_align will have left a new frag. |
| 933 | Use this last frag for an empty ".fill". |
| 934 | |
| 935 | For this segment ... |
| 936 | Create a last frag. Do not leave a "being filled in frag". */ |
| 937 | frag_wane (frag_now); |
| 938 | frag_now->fr_fix = 0; |
| 939 | know (frag_now->fr_next == NULL); |
| 940 | } |
| 941 | |
| 942 | /* From now on, we don't care about sub-segments. Build one frag chain |
| 943 | for each segment. Linked thru fr_next. */ |
| 944 | |
| 945 | #ifdef BFD_ASSEMBLER |
| 946 | /* Remove the sections created by gas for its own purposes. */ |
| 947 | { |
| 948 | asection **seclist, *sec; |
| 949 | seclist = &stdoutput->sections; |
| 950 | while (seclist && *seclist) |
| 951 | { |
| 952 | sec = *seclist; |
| 953 | while (sec == reg_section || sec == expr_section) |
| 954 | { |
| 955 | sec = sec->next; |
| 956 | *seclist = sec; |
| 957 | stdoutput->section_count--; |
| 958 | if (!sec) |
| 959 | break; |
| 960 | } |
| 961 | if (*seclist) |
| 962 | seclist = &(*seclist)->next; |
| 963 | } |
| 964 | } |
| 965 | |
| 966 | bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0); |
| 967 | #else |
| 968 | remove_subsegs (frchain_root, SEG_TEXT, &text_frag_root, &text_last_frag); |
| 969 | remove_subsegs (data0_frchainP, SEG_DATA, &data_frag_root, &data_last_frag); |
| 970 | remove_subsegs (bss0_frchainP, SEG_BSS, &bss_frag_root, &bss_last_frag); |
| 971 | #endif |
| 972 | |
| 973 | /* We have two segments. If user gave -R flag, then we must put the |
| 974 | data frags into the text segment. Do this before relaxing so |
| 975 | we know to take advantage of -R and make shorter addresses. */ |
| 976 | #if !defined (OBJ_AOUT) || defined (BFD_ASSEMBLER) |
| 977 | if (flagseen['R']) |
| 978 | { |
| 979 | merge_data_into_text (); |
| 980 | } |
| 981 | #endif |
| 982 | |
| 983 | #ifdef BFD_ASSEMBLER |
| 984 | bfd_map_over_sections (stdoutput, relax_and_size_seg, (char *) 0); |
| 985 | #else |
| 986 | relax_and_size_all_segments (); |
| 987 | #endif /* BFD_ASSEMBLER */ |
| 988 | |
| 989 | #ifndef BFD_ASSEMBLER |
| 990 | /* |
| 991 | * |
| 992 | * Crawl the symbol chain. |
| 993 | * |
| 994 | * For each symbol whose value depends on a frag, take the address of |
| 995 | * that frag and subsume it into the value of the symbol. |
| 996 | * After this, there is just one way to lookup a symbol value. |
| 997 | * Values are left in their final state for object file emission. |
| 998 | * We adjust the values of 'L' local symbols, even if we do |
| 999 | * not intend to emit them to the object file, because their values |
| 1000 | * are needed for fix-ups. |
| 1001 | * |
| 1002 | * Unless we saw a -L flag, remove all symbols that begin with 'L' |
| 1003 | * from the symbol chain. (They are still pointed to by the fixes.) |
| 1004 | * |
| 1005 | * Count the remaining symbols. |
| 1006 | * Assign a symbol number to each symbol. |
| 1007 | * Count the number of string-table chars we will emit. |
| 1008 | * Put this info into the headers as appropriate. |
| 1009 | * |
| 1010 | */ |
| 1011 | know (zero_address_frag.fr_address == 0); |
| 1012 | string_byte_count = sizeof (string_byte_count); |
| 1013 | |
| 1014 | obj_crawl_symbol_chain (&headers); |
| 1015 | |
| 1016 | if (string_byte_count == sizeof (string_byte_count)) |
| 1017 | string_byte_count = 0; |
| 1018 | |
| 1019 | H_SET_STRING_SIZE (&headers, string_byte_count); |
| 1020 | |
| 1021 | /* |
| 1022 | * Addresses of frags now reflect addresses we use in the object file. |
| 1023 | * Symbol values are correct. |
| 1024 | * Scan the frags, converting any ".org"s and ".align"s to ".fill"s. |
| 1025 | * Also converting any machine-dependent frags using md_convert_frag(); |
| 1026 | */ |
| 1027 | subseg_change (SEG_TEXT, 0); |
| 1028 | |
| 1029 | for (fragP = text_frag_root; fragP; fragP = fragP->fr_next) |
| 1030 | { |
| 1031 | cvt_frag_to_fill (&headers, fragP); |
| 1032 | |
| 1033 | /* Some assert macros don't work with # directives mixed in. */ |
| 1034 | #ifndef NDEBUG |
| 1035 | if (!(fragP->fr_next == NULL |
| 1036 | #ifdef OBJ_BOUT |
| 1037 | || fragP->fr_next == data_frag_root |
| 1038 | #endif |
| 1039 | || ((fragP->fr_next->fr_address - fragP->fr_address) |
| 1040 | == (fragP->fr_fix + fragP->fr_offset * fragP->fr_var)))) |
| 1041 | abort (); |
| 1042 | #endif |
| 1043 | } |
| 1044 | #endif /* ! BFD_ASSEMBLER */ |
| 1045 | |
| 1046 | #ifndef WORKING_DOT_WORD |
| 1047 | { |
| 1048 | struct broken_word *lie; |
| 1049 | struct broken_word **prevP; |
| 1050 | |
| 1051 | prevP = &broken_words; |
| 1052 | for (lie = broken_words; lie; lie = lie->next_broken_word) |
| 1053 | if (!lie->added) |
| 1054 | { |
| 1055 | expressionS exp; |
| 1056 | |
| 1057 | exp.X_op = O_subtract; |
| 1058 | exp.X_add_symbol = lie->add; |
| 1059 | exp.X_op_symbol = lie->sub; |
| 1060 | exp.X_add_number = lie->addnum; |
| 1061 | #ifdef BFD_ASSEMBLER |
| 1062 | fix_new_exp (lie->frag, |
| 1063 | lie->word_goes_here - lie->frag->fr_literal, |
| 1064 | 2, &exp, 0, BFD_RELOC_NONE); |
| 1065 | #else |
| 1066 | #if defined(TC_SPARC) || defined(TC_A29K) || defined(NEED_FX_R_TYPE) |
| 1067 | fix_new_exp (lie->frag, |
| 1068 | lie->word_goes_here - lie->frag->fr_literal, |
| 1069 | 2, &exp, 0, NO_RELOC); |
| 1070 | #else |
| 1071 | #ifdef TC_NS32K |
| 1072 | fix_new_ns32k_exp (lie->frag, |
| 1073 | lie->word_goes_here - lie->frag->fr_literal, |
| 1074 | 2, &exp, 0, 0, 2, 0, 0); |
| 1075 | #else |
| 1076 | fix_new_exp (lie->frag, |
| 1077 | lie->word_goes_here - lie->frag->fr_literal, |
| 1078 | 2, &exp, 0, 0); |
| 1079 | #endif /* TC_NS32K */ |
| 1080 | #endif /* TC_SPARC|TC_A29K|NEED_FX_R_TYPE */ |
| 1081 | #endif /* BFD_ASSEMBLER */ |
| 1082 | *prevP = lie->next_broken_word; |
| 1083 | } |
| 1084 | else |
| 1085 | prevP = &(lie->next_broken_word); |
| 1086 | |
| 1087 | for (lie = broken_words; lie;) |
| 1088 | { |
| 1089 | struct broken_word *untruth; |
| 1090 | char *table_ptr; |
| 1091 | addressT table_addr; |
| 1092 | addressT from_addr, to_addr; |
| 1093 | int n, m; |
| 1094 | |
| 1095 | fragP = lie->dispfrag; |
| 1096 | |
| 1097 | /* Find out how many broken_words go here. */ |
| 1098 | n = 0; |
| 1099 | for (untruth = lie; untruth && untruth->dispfrag == fragP; untruth = untruth->next_broken_word) |
| 1100 | if (untruth->added == 1) |
| 1101 | n++; |
| 1102 | |
| 1103 | table_ptr = lie->dispfrag->fr_opcode; |
| 1104 | table_addr = lie->dispfrag->fr_address + (table_ptr - lie->dispfrag->fr_literal); |
| 1105 | /* Create the jump around the long jumps. This is a short |
| 1106 | jump from table_ptr+0 to table_ptr+n*long_jump_size. */ |
| 1107 | from_addr = table_addr; |
| 1108 | to_addr = table_addr + md_short_jump_size + n * md_long_jump_size; |
| 1109 | md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag, lie->add); |
| 1110 | table_ptr += md_short_jump_size; |
| 1111 | table_addr += md_short_jump_size; |
| 1112 | |
| 1113 | for (m = 0; lie && lie->dispfrag == fragP; m++, lie = lie->next_broken_word) |
| 1114 | { |
| 1115 | if (lie->added == 2) |
| 1116 | continue; |
| 1117 | /* Patch the jump table */ |
| 1118 | /* This is the offset from ??? to table_ptr+0 */ |
| 1119 | to_addr = table_addr - S_GET_VALUE (lie->sub); |
| 1120 | md_number_to_chars (lie->word_goes_here, to_addr, 2); |
| 1121 | for (untruth = lie->next_broken_word; untruth && untruth->dispfrag == fragP; untruth = untruth->next_broken_word) |
| 1122 | { |
| 1123 | if (untruth->use_jump == lie) |
| 1124 | md_number_to_chars (untruth->word_goes_here, to_addr, 2); |
| 1125 | } |
| 1126 | |
| 1127 | /* Install the long jump */ |
| 1128 | /* this is a long jump from table_ptr+0 to the final target */ |
| 1129 | from_addr = table_addr; |
| 1130 | to_addr = S_GET_VALUE (lie->add) + lie->addnum; |
| 1131 | md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag, lie->add); |
| 1132 | table_ptr += md_long_jump_size; |
| 1133 | table_addr += md_long_jump_size; |
| 1134 | } |
| 1135 | } |
| 1136 | } |
| 1137 | #endif /* not WORKING_DOT_WORD */ |
| 1138 | |
| 1139 | #ifndef BFD_ASSEMBLER |
| 1140 | #ifndef OBJ_VMS |
| 1141 | { /* not vms */ |
| 1142 | /* |
| 1143 | * Scan every FixS performing fixups. We had to wait until now to do |
| 1144 | * this because md_convert_frag() may have made some fixSs. |
| 1145 | */ |
| 1146 | int trsize, drsize; |
| 1147 | |
| 1148 | subseg_change (SEG_TEXT, 0); |
| 1149 | trsize = md_reloc_size * fixup_segment (text_fix_root, SEG_TEXT); |
| 1150 | subseg_change (SEG_DATA, 0); |
| 1151 | drsize = md_reloc_size * fixup_segment (data_fix_root, SEG_DATA); |
| 1152 | H_SET_RELOCATION_SIZE (&headers, trsize, drsize); |
| 1153 | |
| 1154 | /* FIXME move this stuff into the pre-write-hook */ |
| 1155 | H_SET_MAGIC_NUMBER (&headers, magic_number_for_object_file); |
| 1156 | H_SET_ENTRY_POINT (&headers, 0); |
| 1157 | |
| 1158 | obj_pre_write_hook (&headers); /* extra coff stuff */ |
| 1159 | |
| 1160 | object_file_size = H_GET_FILE_SIZE (&headers); |
| 1161 | next_object_file_charP = the_object_file = xmalloc (object_file_size); |
| 1162 | |
| 1163 | output_file_create (out_file_name); |
| 1164 | |
| 1165 | obj_header_append (&next_object_file_charP, &headers); |
| 1166 | |
| 1167 | know ((next_object_file_charP - the_object_file) == H_GET_HEADER_SIZE (&headers)); |
| 1168 | |
| 1169 | /* |
| 1170 | * Emit code. |
| 1171 | */ |
| 1172 | for (fragP = text_frag_root; fragP; fragP = fragP->fr_next) |
| 1173 | { |
| 1174 | register long count; |
| 1175 | register char *fill_literal; |
| 1176 | register long fill_size; |
| 1177 | |
| 1178 | know (fragP->fr_type == rs_fill); |
| 1179 | append (&next_object_file_charP, fragP->fr_literal, (unsigned long) fragP->fr_fix); |
| 1180 | fill_literal = fragP->fr_literal + fragP->fr_fix; |
| 1181 | fill_size = fragP->fr_var; |
| 1182 | know (fragP->fr_offset >= 0); |
| 1183 | |
| 1184 | for (count = fragP->fr_offset; count; count--) |
| 1185 | { |
| 1186 | append (&next_object_file_charP, fill_literal, (unsigned long) fill_size); |
| 1187 | } /* for each */ |
| 1188 | |
| 1189 | } /* for each code frag. */ |
| 1190 | |
| 1191 | know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers))); |
| 1192 | |
| 1193 | /* |
| 1194 | * Emit relocations. |
| 1195 | */ |
| 1196 | obj_emit_relocations (&next_object_file_charP, text_fix_root, (relax_addressT) 0); |
| 1197 | know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers) + H_GET_TEXT_RELOCATION_SIZE (&headers))); |
| 1198 | #ifdef TC_I960 |
| 1199 | /* Make addresses in data relocation directives relative to beginning of |
| 1200 | * first data fragment, not end of last text fragment: alignment of the |
| 1201 | * start of the data segment may place a gap between the segments. |
| 1202 | */ |
| 1203 | obj_emit_relocations (&next_object_file_charP, data_fix_root, data0_frchainP->frch_root->fr_address); |
| 1204 | #else /* TC_I960 */ |
| 1205 | obj_emit_relocations (&next_object_file_charP, data_fix_root, text_last_frag->fr_address); |
| 1206 | #endif /* TC_I960 */ |
| 1207 | |
| 1208 | know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers) + H_GET_TEXT_RELOCATION_SIZE (&headers) + H_GET_DATA_RELOCATION_SIZE (&headers))); |
| 1209 | |
| 1210 | /* |
| 1211 | * Emit line number entries. |
| 1212 | */ |
| 1213 | OBJ_EMIT_LINENO (&next_object_file_charP, lineno_rootP, the_object_file); |
| 1214 | know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers) + H_GET_TEXT_RELOCATION_SIZE (&headers) + H_GET_DATA_RELOCATION_SIZE (&headers) + H_GET_LINENO_SIZE (&headers))); |
| 1215 | |
| 1216 | /* |
| 1217 | * Emit symbols. |
| 1218 | */ |
| 1219 | obj_emit_symbols (&next_object_file_charP, symbol_rootP); |
| 1220 | know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers) + H_GET_TEXT_RELOCATION_SIZE (&headers) + H_GET_DATA_RELOCATION_SIZE (&headers) + H_GET_LINENO_SIZE (&headers) + H_GET_SYMBOL_TABLE_SIZE (&headers))); |
| 1221 | |
| 1222 | /* |
| 1223 | * Emit strings. |
| 1224 | */ |
| 1225 | |
| 1226 | if (string_byte_count > 0) |
| 1227 | { |
| 1228 | obj_emit_strings (&next_object_file_charP); |
| 1229 | } /* only if we have a string table */ |
| 1230 | |
| 1231 | #ifdef BFD_HEADERS |
| 1232 | bfd_seek (stdoutput, 0, 0); |
| 1233 | bfd_write (the_object_file, 1, object_file_size, stdoutput); |
| 1234 | #else |
| 1235 | |
| 1236 | /* Write the data to the file */ |
| 1237 | output_file_append (the_object_file, object_file_size, out_file_name); |
| 1238 | #endif |
| 1239 | |
| 1240 | output_file_close (out_file_name); |
| 1241 | } /* non vms output */ |
| 1242 | #else /* VMS */ |
| 1243 | /* |
| 1244 | * Now do the VMS-dependent part of writing the object file |
| 1245 | */ |
| 1246 | VMS_write_object_file (H_GET_TEXT_SIZE (&headers), |
| 1247 | H_GET_DATA_SIZE (&headers), |
| 1248 | H_GET_BSS_SIZE (&headers), |
| 1249 | text_frag_root, data_frag_root); |
| 1250 | #endif /* VMS */ |
| 1251 | #else /* BFD_ASSEMBLER */ |
| 1252 | |
| 1253 | #ifdef obj_check_file_symbols |
| 1254 | obj_check_file_symbols (); |
| 1255 | #endif |
| 1256 | |
| 1257 | bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *)0); |
| 1258 | |
| 1259 | /* Set up symbol table, and write it out. */ |
| 1260 | if (symbol_rootP) |
| 1261 | { |
| 1262 | int i = 0, n; |
| 1263 | symbolS *symp; |
| 1264 | |
| 1265 | for (symp = symbol_rootP; symp; symp = symbol_next (symp)) |
| 1266 | { |
| 1267 | if (! symp->sy_resolved) |
| 1268 | { |
| 1269 | if (symp->sy_value.X_op == O_constant) |
| 1270 | { |
| 1271 | /* This is the normal case; skip the call. */ |
| 1272 | S_SET_VALUE (symp, |
| 1273 | (S_GET_VALUE (symp) |
| 1274 | + symp->sy_frag->fr_address)); |
| 1275 | symp->sy_resolved = 1; |
| 1276 | } |
| 1277 | else |
| 1278 | resolve_symbol_value (symp); |
| 1279 | } |
| 1280 | |
| 1281 | /* So far, common symbols have been treated like undefined symbols. |
| 1282 | Put them in the common section now. */ |
| 1283 | if (S_IS_DEFINED (symp) == 0 |
| 1284 | && S_GET_VALUE (symp) != 0) |
| 1285 | S_SET_SEGMENT (symp, &bfd_com_section); |
| 1286 | #if 0 |
| 1287 | printf ("symbol `%s'\n\t@%x: value=%d flags=%x seg=%s\n", |
| 1288 | S_GET_NAME (symp), symp, |
| 1289 | S_GET_VALUE (symp), |
| 1290 | symp->bsym->flags, |
| 1291 | segment_name (symp->bsym->section)); |
| 1292 | #endif |
| 1293 | { |
| 1294 | #ifdef obj_frob_symbol |
| 1295 | { |
| 1296 | int punt = 0; |
| 1297 | obj_frob_symbol (symp, punt); |
| 1298 | if (punt) |
| 1299 | goto punt_it; |
| 1300 | } |
| 1301 | #endif |
| 1302 | #ifdef tc_frob_symbol |
| 1303 | { |
| 1304 | int punt = 0; |
| 1305 | tc_frob_symbol (symp, punt); |
| 1306 | if (punt) |
| 1307 | goto punt_it; |
| 1308 | } |
| 1309 | #endif |
| 1310 | } |
| 1311 | /* If we don't want to keep this symbol, splice it out of the |
| 1312 | chain now. */ |
| 1313 | if (S_IS_LOCAL (symp)) |
| 1314 | { |
| 1315 | symbolS *prev, *next; |
| 1316 | #if defined (obj_frob_symbol) || defined (tc_frob_symbol) |
| 1317 | punt_it: |
| 1318 | #endif |
| 1319 | prev = symbol_previous (symp); |
| 1320 | next = symbol_next (symp); |
| 1321 | #ifdef DEBUG_SYMS |
| 1322 | verify_symbol_chain_2 (symp); |
| 1323 | #endif |
| 1324 | if (prev) |
| 1325 | { |
| 1326 | symbol_next (prev) = next; |
| 1327 | symp = prev; |
| 1328 | } |
| 1329 | else if (symp == symbol_rootP) |
| 1330 | symbol_rootP = next; |
| 1331 | else |
| 1332 | abort (); |
| 1333 | if (next) |
| 1334 | symbol_previous (next) = prev; |
| 1335 | else |
| 1336 | symbol_lastP = prev; |
| 1337 | #ifdef DEBUG_SYMS |
| 1338 | if (prev) |
| 1339 | verify_symbol_chain_2 (prev); |
| 1340 | else if (next) |
| 1341 | verify_symbol_chain_2 (next); |
| 1342 | #endif |
| 1343 | continue; |
| 1344 | } |
| 1345 | |
| 1346 | /* Set the value into the BFD symbol. Up til now the value |
| 1347 | has only been kept in the gas symbolS struct. */ |
| 1348 | symp->bsym->value = S_GET_VALUE (symp); |
| 1349 | |
| 1350 | i++; |
| 1351 | } |
| 1352 | n = i; |
| 1353 | if (n) |
| 1354 | { |
| 1355 | asymbol **asympp; |
| 1356 | boolean result; |
| 1357 | extern PTR bfd_alloc PARAMS ((bfd *, size_t)); |
| 1358 | |
| 1359 | asympp = (asymbol **) bfd_alloc (stdoutput, |
| 1360 | n * sizeof (asymbol *)); |
| 1361 | symp = symbol_rootP; |
| 1362 | for (i = 0; i < n; i++, symp = symbol_next (symp)) |
| 1363 | { |
| 1364 | asympp[i] = symp->bsym; |
| 1365 | symp->written = 1; |
| 1366 | } |
| 1367 | result = bfd_set_symtab (stdoutput, asympp, n); |
| 1368 | assert (result == true); |
| 1369 | } |
| 1370 | } |
| 1371 | |
| 1372 | |
| 1373 | #ifdef obj_frob_file |
| 1374 | /* If obj_frob_file changes the symbol value at this point, it is |
| 1375 | responsible for moving the changed value into symp->bsym->value |
| 1376 | as well. Hopefully all symbol value changing can be done in |
| 1377 | {obj,tc}_frob_symbol. */ |
| 1378 | obj_frob_file (); |
| 1379 | #endif |
| 1380 | |
| 1381 | /* Now that all the sizes are known, and contents correct, we can |
| 1382 | start writing the file. */ |
| 1383 | bfd_map_over_sections (stdoutput, write_relocs, (char *) 0); |
| 1384 | |
| 1385 | bfd_map_over_sections (stdoutput, write_contents, (char *) 0); |
| 1386 | |
| 1387 | output_file_close (out_file_name); |
| 1388 | #endif /* BFD_ASSEMBLER */ |
| 1389 | } |
| 1390 | #endif /* ! BFD */ |
| 1391 | |
| 1392 | /* |
| 1393 | * relax_segment() |
| 1394 | * |
| 1395 | * Now we have a segment, not a crowd of sub-segments, we can make fr_address |
| 1396 | * values. |
| 1397 | * |
| 1398 | * Relax the frags. |
| 1399 | * |
| 1400 | * After this, all frags in this segment have addresses that are correct |
| 1401 | * within the segment. Since segments live in different file addresses, |
| 1402 | * these frag addresses may not be the same as final object-file addresses. |
| 1403 | */ |
| 1404 | |
| 1405 | /* Subroutines of relax_segment. */ |
| 1406 | static int |
| 1407 | is_dnrange (f1, f2) |
| 1408 | struct frag *f1; |
| 1409 | struct frag *f2; |
| 1410 | { |
| 1411 | for (; f1; f1 = f1->fr_next) |
| 1412 | if (f1->fr_next == f2) |
| 1413 | return 1; |
| 1414 | return 0; |
| 1415 | } |
| 1416 | |
| 1417 | /* Relax_align. Advance location counter to next address that has 'alignment' |
| 1418 | lowest order bits all 0s, return size of adjustment made. */ |
| 1419 | static relax_addressT |
| 1420 | relax_align (address, alignment) |
| 1421 | register relax_addressT address; /* Address now. */ |
| 1422 | register int alignment; /* Alignment (binary). */ |
| 1423 | { |
| 1424 | relax_addressT mask; |
| 1425 | relax_addressT new_address; |
| 1426 | |
| 1427 | mask = ~((~0) << alignment); |
| 1428 | new_address = (address + mask) & (~mask); |
| 1429 | if (linkrelax) |
| 1430 | /* We must provide lots of padding, so the linker can discard it |
| 1431 | when needed. The linker will not add extra space, ever. */ |
| 1432 | new_address += (1 << alignment); |
| 1433 | return (new_address - address); |
| 1434 | } |
| 1435 | |
| 1436 | void |
| 1437 | relax_segment (segment_frag_root, segment) |
| 1438 | struct frag *segment_frag_root; |
| 1439 | segT segment; |
| 1440 | { |
| 1441 | register struct frag *fragP; |
| 1442 | register relax_addressT address; |
| 1443 | #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER) |
| 1444 | know (segment == SEG_DATA || segment == SEG_TEXT || segment == SEG_BSS); |
| 1445 | #endif |
| 1446 | /* In case md_estimate_size_before_relax() wants to make fixSs. */ |
| 1447 | subseg_change (segment, 0); |
| 1448 | |
| 1449 | /* For each frag in segment: count and store (a 1st guess of) |
| 1450 | fr_address. */ |
| 1451 | address = 0; |
| 1452 | for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next) |
| 1453 | { |
| 1454 | fragP->fr_address = address; |
| 1455 | address += fragP->fr_fix; |
| 1456 | |
| 1457 | switch (fragP->fr_type) |
| 1458 | { |
| 1459 | case rs_fill: |
| 1460 | address += fragP->fr_offset * fragP->fr_var; |
| 1461 | break; |
| 1462 | |
| 1463 | case rs_align: |
| 1464 | address += relax_align (address, (int) fragP->fr_offset); |
| 1465 | break; |
| 1466 | |
| 1467 | case rs_org: |
| 1468 | /* Assume .org is nugatory. It will grow with 1st relax. */ |
| 1469 | break; |
| 1470 | |
| 1471 | case rs_machine_dependent: |
| 1472 | address += md_estimate_size_before_relax (fragP, segment); |
| 1473 | break; |
| 1474 | |
| 1475 | #ifndef WORKING_DOT_WORD |
| 1476 | /* Broken words don't concern us yet */ |
| 1477 | case rs_broken_word: |
| 1478 | break; |
| 1479 | #endif |
| 1480 | |
| 1481 | default: |
| 1482 | BAD_CASE (fragP->fr_type); |
| 1483 | break; |
| 1484 | } /* switch(fr_type) */ |
| 1485 | } /* for each frag in the segment */ |
| 1486 | |
| 1487 | /* Do relax(). */ |
| 1488 | { |
| 1489 | long stretch; /* May be any size, 0 or negative. */ |
| 1490 | /* Cumulative number of addresses we have */ |
| 1491 | /* relaxed this pass. */ |
| 1492 | /* We may have relaxed more than one address. */ |
| 1493 | long stretched; /* Have we stretched on this pass? */ |
| 1494 | /* This is 'cuz stretch may be zero, when, in fact some piece of code |
| 1495 | grew, and another shrank. If a branch instruction doesn't fit anymore, |
| 1496 | we could be scrod. */ |
| 1497 | |
| 1498 | do |
| 1499 | { |
| 1500 | stretch = stretched = 0; |
| 1501 | for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next) |
| 1502 | { |
| 1503 | long growth = 0; |
| 1504 | unsigned long was_address; |
| 1505 | long offset; |
| 1506 | symbolS *symbolP; |
| 1507 | long target; |
| 1508 | long after; |
| 1509 | long aim; |
| 1510 | |
| 1511 | was_address = fragP->fr_address; |
| 1512 | address = fragP->fr_address += stretch; |
| 1513 | symbolP = fragP->fr_symbol; |
| 1514 | offset = fragP->fr_offset; |
| 1515 | |
| 1516 | switch (fragP->fr_type) |
| 1517 | { |
| 1518 | case rs_fill: /* .fill never relaxes. */ |
| 1519 | growth = 0; |
| 1520 | break; |
| 1521 | |
| 1522 | #ifndef WORKING_DOT_WORD |
| 1523 | /* JF: This is RMS's idea. I do *NOT* want to be blamed |
| 1524 | for it I do not want to write it. I do not want to have |
| 1525 | anything to do with it. This is not the proper way to |
| 1526 | implement this misfeature. */ |
| 1527 | case rs_broken_word: |
| 1528 | { |
| 1529 | struct broken_word *lie; |
| 1530 | struct broken_word *untruth; |
| 1531 | |
| 1532 | /* Yes this is ugly (storing the broken_word pointer |
| 1533 | in the symbol slot). Still, this whole chunk of |
| 1534 | code is ugly, and I don't feel like doing anything |
| 1535 | about it. Think of it as stubbornness in action. */ |
| 1536 | growth = 0; |
| 1537 | for (lie = (struct broken_word *) (fragP->fr_symbol); |
| 1538 | lie && lie->dispfrag == fragP; |
| 1539 | lie = lie->next_broken_word) |
| 1540 | { |
| 1541 | |
| 1542 | if (lie->added) |
| 1543 | continue; |
| 1544 | |
| 1545 | offset = (lie->add->sy_frag->fr_address |
| 1546 | + S_GET_VALUE (lie->add) |
| 1547 | + lie->addnum |
| 1548 | - (lie->sub->sy_frag->fr_address |
| 1549 | + S_GET_VALUE (lie->sub))); |
| 1550 | if (offset <= -32768 || offset >= 32767) |
| 1551 | { |
| 1552 | if (flagseen['K']) |
| 1553 | { |
| 1554 | char buf[50]; |
| 1555 | sprint_value (buf, lie->addnum); |
| 1556 | as_warn (".word %s-%s+%s didn't fit", |
| 1557 | S_GET_NAME (lie->add), |
| 1558 | S_GET_NAME (lie->sub), |
| 1559 | buf); |
| 1560 | } |
| 1561 | lie->added = 1; |
| 1562 | if (fragP->fr_subtype == 0) |
| 1563 | { |
| 1564 | fragP->fr_subtype++; |
| 1565 | growth += md_short_jump_size; |
| 1566 | } |
| 1567 | for (untruth = lie->next_broken_word; |
| 1568 | untruth && untruth->dispfrag == lie->dispfrag; |
| 1569 | untruth = untruth->next_broken_word) |
| 1570 | if ((untruth->add->sy_frag == lie->add->sy_frag) |
| 1571 | && S_GET_VALUE (untruth->add) == S_GET_VALUE (lie->add)) |
| 1572 | { |
| 1573 | untruth->added = 2; |
| 1574 | untruth->use_jump = lie; |
| 1575 | } |
| 1576 | growth += md_long_jump_size; |
| 1577 | } |
| 1578 | } |
| 1579 | |
| 1580 | break; |
| 1581 | } /* case rs_broken_word */ |
| 1582 | #endif |
| 1583 | case rs_align: |
| 1584 | growth = (relax_align ((relax_addressT) (address |
| 1585 | + fragP->fr_fix), |
| 1586 | (int) offset) |
| 1587 | - relax_align ((relax_addressT) (was_address |
| 1588 | + fragP->fr_fix), |
| 1589 | (int) offset)); |
| 1590 | break; |
| 1591 | |
| 1592 | case rs_org: |
| 1593 | target = offset; |
| 1594 | |
| 1595 | if (symbolP) |
| 1596 | { |
| 1597 | #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER) |
| 1598 | know ((S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE) |
| 1599 | || (S_GET_SEGMENT (symbolP) == SEG_DATA) |
| 1600 | || (S_GET_SEGMENT (symbolP) == SEG_TEXT) |
| 1601 | || S_GET_SEGMENT (symbolP) == SEG_BSS); |
| 1602 | know (symbolP->sy_frag); |
| 1603 | know (!(S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE) |
| 1604 | || (symbolP->sy_frag == &zero_address_frag)); |
| 1605 | #endif |
| 1606 | target += S_GET_VALUE (symbolP) |
| 1607 | + symbolP->sy_frag->fr_address; |
| 1608 | } /* if we have a symbol */ |
| 1609 | |
| 1610 | know (fragP->fr_next); |
| 1611 | after = fragP->fr_next->fr_address; |
| 1612 | growth = ((target - after) > 0) ? (target - after) : 0; |
| 1613 | /* Growth may be negative, but variable part of frag |
| 1614 | cannot have fewer than 0 chars. That is, we can't |
| 1615 | .org backwards. */ |
| 1616 | |
| 1617 | growth -= stretch; /* This is an absolute growth factor */ |
| 1618 | break; |
| 1619 | |
| 1620 | case rs_machine_dependent: |
| 1621 | { |
| 1622 | const relax_typeS *this_type; |
| 1623 | const relax_typeS *start_type; |
| 1624 | relax_substateT next_state; |
| 1625 | relax_substateT this_state; |
| 1626 | |
| 1627 | this_state = fragP->fr_subtype; |
| 1628 | start_type = this_type = md_relax_table + this_state; |
| 1629 | target = offset; |
| 1630 | |
| 1631 | if (symbolP) |
| 1632 | { |
| 1633 | #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER) |
| 1634 | know ((S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE) |
| 1635 | || (S_GET_SEGMENT (symbolP) == SEG_DATA) |
| 1636 | || (S_GET_SEGMENT (symbolP) == SEG_BSS) |
| 1637 | || (S_GET_SEGMENT (symbolP) == SEG_TEXT)); |
| 1638 | #endif |
| 1639 | know (symbolP->sy_frag); |
| 1640 | know (!(S_GET_SEGMENT (symbolP) == absolute_section) |
| 1641 | || symbolP->sy_frag == &zero_address_frag); |
| 1642 | target += |
| 1643 | S_GET_VALUE (symbolP) |
| 1644 | + symbolP->sy_frag->fr_address; |
| 1645 | |
| 1646 | /* If frag has yet to be reached on this pass, |
| 1647 | assume it will move by STRETCH just as we did. |
| 1648 | If this is not so, it will be because some frag |
| 1649 | between grows, and that will force another pass. |
| 1650 | |
| 1651 | Beware zero-length frags. |
| 1652 | |
| 1653 | There should be a faster way to do this. */ |
| 1654 | |
| 1655 | if (symbolP->sy_frag->fr_address >= was_address |
| 1656 | && is_dnrange (fragP, symbolP->sy_frag)) |
| 1657 | { |
| 1658 | target += stretch; |
| 1659 | } |
| 1660 | } |
| 1661 | |
| 1662 | aim = target - address - fragP->fr_fix; |
| 1663 | /* The displacement is affected by the instruction size |
| 1664 | for the 32k architecture. I think we ought to be able |
| 1665 | to add fragP->fr_pcrel_adjust in all cases (it should be |
| 1666 | zero if not used), but just in case it breaks something |
| 1667 | else we'll put this inside #ifdef NS32K ... #endif */ |
| 1668 | #ifndef TC_NS32K |
| 1669 | if (fragP->fr_pcrel_adjust) |
| 1670 | abort (); |
| 1671 | #endif |
| 1672 | aim += fragP->fr_pcrel_adjust; |
| 1673 | |
| 1674 | if (aim < 0) |
| 1675 | { |
| 1676 | /* Look backwards. */ |
| 1677 | for (next_state = this_type->rlx_more; next_state;) |
| 1678 | if (aim >= this_type->rlx_backward) |
| 1679 | next_state = 0; |
| 1680 | else |
| 1681 | { |
| 1682 | /* Grow to next state. */ |
| 1683 | this_state = next_state; |
| 1684 | this_type = md_relax_table + this_state; |
| 1685 | next_state = this_type->rlx_more; |
| 1686 | } |
| 1687 | } |
| 1688 | else |
| 1689 | { |
| 1690 | #ifdef M68K_AIM_KLUDGE |
| 1691 | M68K_AIM_KLUDGE (aim, this_state, this_type); |
| 1692 | #endif |
| 1693 | /* Look forwards. */ |
| 1694 | for (next_state = this_type->rlx_more; next_state;) |
| 1695 | if (aim <= this_type->rlx_forward) |
| 1696 | next_state = 0; |
| 1697 | else |
| 1698 | { |
| 1699 | /* Grow to next state. */ |
| 1700 | this_state = next_state; |
| 1701 | this_type = md_relax_table + this_state; |
| 1702 | next_state = this_type->rlx_more; |
| 1703 | } |
| 1704 | } |
| 1705 | |
| 1706 | growth = this_type->rlx_length - start_type->rlx_length; |
| 1707 | if (growth != 0) |
| 1708 | fragP->fr_subtype = this_state; |
| 1709 | } |
| 1710 | break; |
| 1711 | |
| 1712 | default: |
| 1713 | BAD_CASE (fragP->fr_type); |
| 1714 | break; |
| 1715 | } |
| 1716 | if (growth) |
| 1717 | { |
| 1718 | stretch += growth; |
| 1719 | stretched++; |
| 1720 | } |
| 1721 | } /* For each frag in the segment. */ |
| 1722 | } |
| 1723 | while (stretched); /* Until nothing further to relax. */ |
| 1724 | } /* do_relax */ |
| 1725 | |
| 1726 | /* |
| 1727 | * We now have valid fr_address'es for each frag. |
| 1728 | */ |
| 1729 | |
| 1730 | /* |
| 1731 | * All fr_address's are correct, relative to their own segment. |
| 1732 | * We have made all the fixS we will ever make. |
| 1733 | */ |
| 1734 | } /* relax_segment() */ |
| 1735 | |
| 1736 | /* fixup_segment() |
| 1737 | |
| 1738 | Go through all the fixS's in a segment and see which ones can be |
| 1739 | handled now. (These consist of fixS where we have since discovered |
| 1740 | the value of a symbol, or the address of the frag involved.) |
| 1741 | For each one, call md_apply_fix to put the fix into the frag data. |
| 1742 | |
| 1743 | Result is a count of how many relocation structs will be needed to |
| 1744 | handle the remaining fixS's that we couldn't completely handle here. |
| 1745 | These will be output later by emit_relocations(). */ |
| 1746 | |
| 1747 | static long |
| 1748 | fixup_segment (fixP, this_segment_type) |
| 1749 | register fixS *fixP; |
| 1750 | segT this_segment_type; /* N_TYPE bits for segment. */ |
| 1751 | { |
| 1752 | register long seg_reloc_count; |
| 1753 | register symbolS *add_symbolP; |
| 1754 | register symbolS *sub_symbolP; |
| 1755 | valueT add_number; |
| 1756 | register int size; |
| 1757 | register char *place; |
| 1758 | register long where; |
| 1759 | register char pcrel; |
| 1760 | register fragS *fragP; |
| 1761 | register segT add_symbol_segment = absolute_section; |
| 1762 | |
| 1763 | seg_reloc_count = 0; |
| 1764 | /* If the linker is doing the relaxing, we must not do any fixups. */ |
| 1765 | /* Well, strictly speaking that's not true -- we could do any that |
| 1766 | are PC-relative and don't cross regions that could change size. |
| 1767 | And for the i960 (the only machine for which we've got a relaxing |
| 1768 | linker right now), we might be able to turn callx/callj into bal |
| 1769 | in cases where we know the maximum displacement. */ |
| 1770 | if (linkrelax) |
| 1771 | for (; fixP; fixP = fixP->fx_next) |
| 1772 | seg_reloc_count++; |
| 1773 | else |
| 1774 | for (; fixP; fixP = fixP->fx_next) |
| 1775 | { |
| 1776 | fragP = fixP->fx_frag; |
| 1777 | know (fragP); |
| 1778 | where = fixP->fx_where; |
| 1779 | place = fragP->fr_literal + where; |
| 1780 | size = fixP->fx_size; |
| 1781 | add_symbolP = fixP->fx_addsy; |
| 1782 | #ifdef TC_I960 |
| 1783 | if (fixP->fx_callj && TC_S_IS_CALLNAME (add_symbolP)) |
| 1784 | { |
| 1785 | /* Relocation should be done via the associated 'bal' |
| 1786 | entry point symbol. */ |
| 1787 | |
| 1788 | if (!TC_S_IS_BALNAME (tc_get_bal_of_call (add_symbolP))) |
| 1789 | { |
| 1790 | as_bad ("No 'bal' entry point for leafproc %s", |
| 1791 | S_GET_NAME (add_symbolP)); |
| 1792 | continue; |
| 1793 | } |
| 1794 | fixP->fx_addsy = add_symbolP = tc_get_bal_of_call (add_symbolP); |
| 1795 | } |
| 1796 | #endif |
| 1797 | sub_symbolP = fixP->fx_subsy; |
| 1798 | add_number = fixP->fx_offset; |
| 1799 | pcrel = fixP->fx_pcrel; |
| 1800 | |
| 1801 | if (add_symbolP) |
| 1802 | add_symbol_segment = S_GET_SEGMENT (add_symbolP); |
| 1803 | |
| 1804 | if (sub_symbolP) |
| 1805 | { |
| 1806 | if (!add_symbolP) |
| 1807 | { |
| 1808 | /* Its just -sym */ |
| 1809 | if (S_GET_SEGMENT (sub_symbolP) != absolute_section) |
| 1810 | as_bad ("Negative of non-absolute symbol %s", |
| 1811 | S_GET_NAME (sub_symbolP)); |
| 1812 | |
| 1813 | add_number -= S_GET_VALUE (sub_symbolP); |
| 1814 | } |
| 1815 | else if ((S_GET_SEGMENT (sub_symbolP) == add_symbol_segment) |
| 1816 | && (SEG_NORMAL (add_symbol_segment) |
| 1817 | || (add_symbol_segment == absolute_section))) |
| 1818 | { |
| 1819 | /* Difference of 2 symbols from same segment. |
| 1820 | Can't make difference of 2 undefineds: 'value' means |
| 1821 | something different for N_UNDF. */ |
| 1822 | #ifdef TC_I960 |
| 1823 | /* Makes no sense to use the difference of 2 arbitrary symbols |
| 1824 | as the target of a call instruction. */ |
| 1825 | if (fixP->fx_callj) |
| 1826 | { |
| 1827 | as_bad ("callj to difference of 2 symbols"); |
| 1828 | } |
| 1829 | #endif /* TC_I960 */ |
| 1830 | add_number += S_GET_VALUE (add_symbolP) - |
| 1831 | S_GET_VALUE (sub_symbolP); |
| 1832 | |
| 1833 | add_symbolP = NULL; |
| 1834 | fixP->fx_addsy = NULL; |
| 1835 | } |
| 1836 | else |
| 1837 | { |
| 1838 | /* Different segments in subtraction. */ |
| 1839 | know (!(S_IS_EXTERNAL (sub_symbolP) |
| 1840 | && (S_GET_SEGMENT (sub_symbolP) == absolute_section))); |
| 1841 | |
| 1842 | if ((S_GET_SEGMENT (sub_symbolP) == absolute_section)) |
| 1843 | { |
| 1844 | add_number -= S_GET_VALUE (sub_symbolP); |
| 1845 | } |
| 1846 | else |
| 1847 | { |
| 1848 | char buf[50]; |
| 1849 | sprint_value (buf, fragP->fr_address + where); |
| 1850 | as_bad ("Can't emit reloc {- %s-seg symbol \"%s\"} @ file address %s.", |
| 1851 | segment_name (S_GET_SEGMENT (sub_symbolP)), |
| 1852 | S_GET_NAME (sub_symbolP), buf); |
| 1853 | } |
| 1854 | } |
| 1855 | } |
| 1856 | |
| 1857 | if (add_symbolP) |
| 1858 | { |
| 1859 | if (add_symbol_segment == this_segment_type && pcrel) |
| 1860 | { |
| 1861 | /* |
| 1862 | * This fixup was made when the symbol's segment was |
| 1863 | * SEG_UNKNOWN, but it is now in the local segment. |
| 1864 | * So we know how to do the address without relocation. |
| 1865 | */ |
| 1866 | #ifdef TC_I960 |
| 1867 | /* reloc_callj() may replace a 'call' with a 'calls' or a |
| 1868 | 'bal', in which cases it modifies *fixP as appropriate. |
| 1869 | In the case of a 'calls', no further work is required, |
| 1870 | and *fixP has been set up to make the rest of the code |
| 1871 | below a no-op. */ |
| 1872 | reloc_callj (fixP); |
| 1873 | #endif /* TC_I960 */ |
| 1874 | |
| 1875 | add_number += S_GET_VALUE (add_symbolP); |
| 1876 | add_number -= md_pcrel_from (fixP); |
| 1877 | pcrel = 0; /* Lie. Don't want further pcrel processing. */ |
| 1878 | fixP->fx_addsy = NULL; /* No relocations please. */ |
| 1879 | } |
| 1880 | else |
| 1881 | { |
| 1882 | if (add_symbol_segment == absolute_section) |
| 1883 | { |
| 1884 | #ifdef TC_I960 |
| 1885 | /* See comment about reloc_callj() above. */ |
| 1886 | reloc_callj (fixP); |
| 1887 | #endif /* TC_I960 */ |
| 1888 | add_number += S_GET_VALUE (add_symbolP); |
| 1889 | fixP->fx_addsy = NULL; |
| 1890 | add_symbolP = NULL; |
| 1891 | } |
| 1892 | else if (add_symbol_segment == undefined_section |
| 1893 | #ifdef BFD_ASSEMBLER |
| 1894 | || bfd_is_com_section (add_symbol_segment) |
| 1895 | #endif |
| 1896 | ) |
| 1897 | { |
| 1898 | #ifdef TC_I960 |
| 1899 | if ((int) fixP->fx_bit_fixP == 13) |
| 1900 | { |
| 1901 | /* This is a COBR instruction. They have only a |
| 1902 | * 13-bit displacement and are only to be used |
| 1903 | * for local branches: flag as error, don't generate |
| 1904 | * relocation. |
| 1905 | */ |
| 1906 | as_bad ("can't use COBR format with external label"); |
| 1907 | fixP->fx_addsy = NULL; /* No relocations please. */ |
| 1908 | continue; |
| 1909 | } /* COBR */ |
| 1910 | #endif /* TC_I960 */ |
| 1911 | |
| 1912 | #ifdef OBJ_COFF |
| 1913 | #ifdef TE_I386AIX |
| 1914 | if (S_IS_COMMON (add_symbolP)) |
| 1915 | add_number += S_GET_VALUE (add_symbolP); |
| 1916 | #endif /* TE_I386AIX */ |
| 1917 | #endif /* OBJ_COFF */ |
| 1918 | ++seg_reloc_count; |
| 1919 | } |
| 1920 | else |
| 1921 | { |
| 1922 | seg_reloc_count++; |
| 1923 | add_number += S_GET_VALUE (add_symbolP); |
| 1924 | } |
| 1925 | } /* if not in local seg */ |
| 1926 | } /* if there was a + symbol */ |
| 1927 | |
| 1928 | if (pcrel) |
| 1929 | { |
| 1930 | add_number -= md_pcrel_from (fixP); |
| 1931 | if (add_symbolP == 0) |
| 1932 | { |
| 1933 | fixP->fx_addsy = &abs_symbol; |
| 1934 | ++seg_reloc_count; |
| 1935 | } /* if there's an add_symbol */ |
| 1936 | } /* if pcrel */ |
| 1937 | |
| 1938 | if (!fixP->fx_bit_fixP) |
| 1939 | { |
| 1940 | valueT mask = 0; |
| 1941 | /* set all bits to one */ |
| 1942 | mask--; |
| 1943 | /* Technically speaking, combining these produces an |
| 1944 | undefined result if size is sizeof (valueT), though I |
| 1945 | think these two half-way operations should both be |
| 1946 | defined. */ |
| 1947 | mask <<= size * 4; |
| 1948 | mask <<= size * 4; |
| 1949 | if ((add_number & mask) != 0 |
| 1950 | && (add_number & mask) != mask) |
| 1951 | { |
| 1952 | char buf[50]; |
| 1953 | sprint_value (buf, fragP->fr_address + where); |
| 1954 | as_bad ("Value of %ld too large for field of %d bytes at %s", |
| 1955 | (long) add_number, size, buf); |
| 1956 | } /* generic error checking */ |
| 1957 | #ifdef WARN_SIGNED_OVERFLOW_WORD |
| 1958 | /* Warn if a .word value is too large when treated as a signed |
| 1959 | number. We already know it is not too negative. This is to |
| 1960 | catch over-large switches generated by gcc on the 68k. */ |
| 1961 | if (!flagseen['J'] |
| 1962 | && size == 2 |
| 1963 | && add_number > 0x7fff) |
| 1964 | as_bad ("Signed .word overflow; switch may be too large; %d at 0x%x", |
| 1965 | add_number, fragP->fr_address + where); |
| 1966 | #endif |
| 1967 | } /* not a bit fix */ |
| 1968 | |
| 1969 | #ifdef BFD_ASSEMBLER |
| 1970 | md_apply_fix (fixP, &add_number); |
| 1971 | #else |
| 1972 | md_apply_fix (fixP, add_number); |
| 1973 | #endif |
| 1974 | } /* For each fixS in this segment. */ |
| 1975 | |
| 1976 | #if defined (OBJ_COFF) && defined (TC_I960) |
| 1977 | { |
| 1978 | fixS *topP = fixP; |
| 1979 | |
| 1980 | /* two relocs per callj under coff. */ |
| 1981 | for (fixP = topP; fixP; fixP = fixP->fx_next) |
| 1982 | if (fixP->fx_callj && fixP->fx_addsy != 0) |
| 1983 | ++seg_reloc_count; |
| 1984 | } |
| 1985 | #endif /* OBJ_COFF && TC_I960 */ |
| 1986 | |
| 1987 | return (seg_reloc_count); |
| 1988 | } |
| 1989 | |
| 1990 | /* end of write.c */ |