| 1 | /* write.c - emit .o file |
| 2 | Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
| 3 | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GAS, the GNU Assembler. |
| 7 | |
| 8 | GAS is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | GAS is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with GAS; see the file COPYING. If not, write to the Free |
| 20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 21 | 02110-1301, USA. */ |
| 22 | |
| 23 | /* This thing should be set up to do byteordering correctly. But... */ |
| 24 | |
| 25 | #include "as.h" |
| 26 | #include "subsegs.h" |
| 27 | #include "obstack.h" |
| 28 | #include "output-file.h" |
| 29 | #include "dwarf2dbg.h" |
| 30 | #include "libbfd.h" |
| 31 | |
| 32 | #ifndef TC_ADJUST_RELOC_COUNT |
| 33 | #define TC_ADJUST_RELOC_COUNT(FIX, COUNT) |
| 34 | #endif |
| 35 | |
| 36 | #ifndef TC_FORCE_RELOCATION |
| 37 | #define TC_FORCE_RELOCATION(FIX) \ |
| 38 | (generic_force_reloc (FIX)) |
| 39 | #endif |
| 40 | |
| 41 | #ifndef TC_FORCE_RELOCATION_ABS |
| 42 | #define TC_FORCE_RELOCATION_ABS(FIX) \ |
| 43 | (TC_FORCE_RELOCATION (FIX)) |
| 44 | #endif |
| 45 | |
| 46 | #ifndef TC_FORCE_RELOCATION_LOCAL |
| 47 | #define TC_FORCE_RELOCATION_LOCAL(FIX) \ |
| 48 | (!(FIX)->fx_pcrel \ |
| 49 | || TC_FORCE_RELOCATION (FIX)) |
| 50 | #endif |
| 51 | |
| 52 | #ifndef TC_FORCE_RELOCATION_SUB_SAME |
| 53 | #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \ |
| 54 | (! SEG_NORMAL (SEG)) |
| 55 | #endif |
| 56 | |
| 57 | #ifndef md_register_arithmetic |
| 58 | # define md_register_arithmetic 1 |
| 59 | #endif |
| 60 | |
| 61 | #ifndef TC_FORCE_RELOCATION_SUB_ABS |
| 62 | #define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG) \ |
| 63 | (!md_register_arithmetic && (SEG) == reg_section) |
| 64 | #endif |
| 65 | |
| 66 | #ifndef TC_FORCE_RELOCATION_SUB_LOCAL |
| 67 | #ifdef DIFF_EXPR_OK |
| 68 | #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \ |
| 69 | (!md_register_arithmetic && (SEG) == reg_section) |
| 70 | #else |
| 71 | #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1 |
| 72 | #endif |
| 73 | #endif |
| 74 | |
| 75 | #ifndef TC_VALIDATE_FIX_SUB |
| 76 | #ifdef UNDEFINED_DIFFERENCE_OK |
| 77 | /* The PA needs this for PIC code generation. */ |
| 78 | #define TC_VALIDATE_FIX_SUB(FIX, SEG) \ |
| 79 | (md_register_arithmetic || (SEG) != reg_section) |
| 80 | #else |
| 81 | #define TC_VALIDATE_FIX_SUB(FIX, SEG) \ |
| 82 | ((md_register_arithmetic || (SEG) != reg_section) \ |
| 83 | && ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \ |
| 84 | || (FIX)->fx_r_type == BFD_RELOC_GPREL16)) |
| 85 | #endif |
| 86 | #endif |
| 87 | |
| 88 | #ifndef TC_LINKRELAX_FIXUP |
| 89 | #define TC_LINKRELAX_FIXUP(SEG) 1 |
| 90 | #endif |
| 91 | |
| 92 | #ifndef MD_APPLY_SYM_VALUE |
| 93 | #define MD_APPLY_SYM_VALUE(FIX) 1 |
| 94 | #endif |
| 95 | |
| 96 | #ifndef TC_FINALIZE_SYMS_BEFORE_SIZE_SEG |
| 97 | #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 1 |
| 98 | #endif |
| 99 | |
| 100 | #ifndef MD_PCREL_FROM_SECTION |
| 101 | #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from (FIX) |
| 102 | #endif |
| 103 | |
| 104 | #ifndef TC_FAKE_LABEL |
| 105 | #define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0) |
| 106 | #endif |
| 107 | |
| 108 | /* Positive values of TC_FX_SIZE_SLACK allow a target to define |
| 109 | fixups that far past the end of a frag. Having such fixups |
| 110 | is of course most most likely a bug in setting fx_size correctly. |
| 111 | A negative value disables the fixup check entirely, which is |
| 112 | appropriate for something like the Renesas / SuperH SH_COUNT |
| 113 | reloc. */ |
| 114 | #ifndef TC_FX_SIZE_SLACK |
| 115 | #define TC_FX_SIZE_SLACK(FIX) 0 |
| 116 | #endif |
| 117 | |
| 118 | /* Used to control final evaluation of expressions. */ |
| 119 | int finalize_syms = 0; |
| 120 | |
| 121 | int symbol_table_frozen; |
| 122 | |
| 123 | symbolS *abs_section_sym; |
| 124 | |
| 125 | /* Remember the value of dot when parsing expressions. */ |
| 126 | addressT dot_value; |
| 127 | |
| 128 | /* Relocs generated by ".reloc" pseudo. */ |
| 129 | struct reloc_list* reloc_list; |
| 130 | |
| 131 | void print_fixup (fixS *); |
| 132 | |
| 133 | /* We generally attach relocs to frag chains. However, after we have |
| 134 | chained these all together into a segment, any relocs we add after |
| 135 | that must be attached to a segment. This will include relocs added |
| 136 | in md_estimate_size_for_relax, for example. */ |
| 137 | static int frags_chained = 0; |
| 138 | |
| 139 | static int n_fixups; |
| 140 | |
| 141 | #define RELOC_ENUM enum bfd_reloc_code_real |
| 142 | |
| 143 | /* Create a fixS in obstack 'notes'. */ |
| 144 | |
| 145 | static fixS * |
| 146 | fix_new_internal (fragS *frag, /* Which frag? */ |
| 147 | int where, /* Where in that frag? */ |
| 148 | int size, /* 1, 2, or 4 usually. */ |
| 149 | symbolS *add_symbol, /* X_add_symbol. */ |
| 150 | symbolS *sub_symbol, /* X_op_symbol. */ |
| 151 | offsetT offset, /* X_add_number. */ |
| 152 | int pcrel, /* TRUE if PC-relative relocation. */ |
| 153 | RELOC_ENUM r_type ATTRIBUTE_UNUSED /* Relocation type. */) |
| 154 | { |
| 155 | fixS *fixP; |
| 156 | |
| 157 | n_fixups++; |
| 158 | |
| 159 | fixP = (fixS *) obstack_alloc (¬es, sizeof (fixS)); |
| 160 | |
| 161 | fixP->fx_frag = frag; |
| 162 | fixP->fx_where = where; |
| 163 | fixP->fx_size = size; |
| 164 | /* We've made fx_size a narrow field; check that it's wide enough. */ |
| 165 | if (fixP->fx_size != size) |
| 166 | { |
| 167 | as_bad (_("field fx_size too small to hold %d"), size); |
| 168 | abort (); |
| 169 | } |
| 170 | fixP->fx_addsy = add_symbol; |
| 171 | fixP->fx_subsy = sub_symbol; |
| 172 | fixP->fx_offset = offset; |
| 173 | fixP->fx_dot_value = dot_value; |
| 174 | fixP->fx_pcrel = pcrel; |
| 175 | fixP->fx_r_type = r_type; |
| 176 | fixP->fx_im_disp = 0; |
| 177 | fixP->fx_pcrel_adjust = 0; |
| 178 | fixP->fx_bit_fixP = 0; |
| 179 | fixP->fx_addnumber = 0; |
| 180 | fixP->fx_tcbit = 0; |
| 181 | fixP->fx_tcbit2 = 0; |
| 182 | fixP->fx_done = 0; |
| 183 | fixP->fx_no_overflow = 0; |
| 184 | fixP->fx_signed = 0; |
| 185 | |
| 186 | #ifdef USING_CGEN |
| 187 | fixP->fx_cgen.insn = NULL; |
| 188 | fixP->fx_cgen.opinfo = 0; |
| 189 | #endif |
| 190 | |
| 191 | #ifdef TC_FIX_TYPE |
| 192 | TC_INIT_FIX_DATA (fixP); |
| 193 | #endif |
| 194 | |
| 195 | as_where (&fixP->fx_file, &fixP->fx_line); |
| 196 | |
| 197 | /* Usually, we want relocs sorted numerically, but while |
| 198 | comparing to older versions of gas that have relocs |
| 199 | reverse sorted, it is convenient to have this compile |
| 200 | time option. xoxorich. */ |
| 201 | { |
| 202 | |
| 203 | fixS **seg_fix_rootP = (frags_chained |
| 204 | ? &seg_info (now_seg)->fix_root |
| 205 | : &frchain_now->fix_root); |
| 206 | fixS **seg_fix_tailP = (frags_chained |
| 207 | ? &seg_info (now_seg)->fix_tail |
| 208 | : &frchain_now->fix_tail); |
| 209 | |
| 210 | #ifdef REVERSE_SORT_RELOCS |
| 211 | |
| 212 | fixP->fx_next = *seg_fix_rootP; |
| 213 | *seg_fix_rootP = fixP; |
| 214 | |
| 215 | #else /* REVERSE_SORT_RELOCS */ |
| 216 | |
| 217 | fixP->fx_next = NULL; |
| 218 | |
| 219 | if (*seg_fix_tailP) |
| 220 | (*seg_fix_tailP)->fx_next = fixP; |
| 221 | else |
| 222 | *seg_fix_rootP = fixP; |
| 223 | *seg_fix_tailP = fixP; |
| 224 | |
| 225 | #endif /* REVERSE_SORT_RELOCS */ |
| 226 | } |
| 227 | |
| 228 | return fixP; |
| 229 | } |
| 230 | |
| 231 | /* Create a fixup relative to a symbol (plus a constant). */ |
| 232 | |
| 233 | fixS * |
| 234 | fix_new (fragS *frag, /* Which frag? */ |
| 235 | int where, /* Where in that frag? */ |
| 236 | int size, /* 1, 2, or 4 usually. */ |
| 237 | symbolS *add_symbol, /* X_add_symbol. */ |
| 238 | offsetT offset, /* X_add_number. */ |
| 239 | int pcrel, /* TRUE if PC-relative relocation. */ |
| 240 | RELOC_ENUM r_type /* Relocation type. */) |
| 241 | { |
| 242 | return fix_new_internal (frag, where, size, add_symbol, |
| 243 | (symbolS *) NULL, offset, pcrel, r_type); |
| 244 | } |
| 245 | |
| 246 | /* Create a fixup for an expression. Currently we only support fixups |
| 247 | for difference expressions. That is itself more than most object |
| 248 | file formats support anyhow. */ |
| 249 | |
| 250 | fixS * |
| 251 | fix_new_exp (fragS *frag, /* Which frag? */ |
| 252 | int where, /* Where in that frag? */ |
| 253 | int size, /* 1, 2, or 4 usually. */ |
| 254 | expressionS *exp, /* Expression. */ |
| 255 | int pcrel, /* TRUE if PC-relative relocation. */ |
| 256 | RELOC_ENUM r_type /* Relocation type. */) |
| 257 | { |
| 258 | symbolS *add = NULL; |
| 259 | symbolS *sub = NULL; |
| 260 | offsetT off = 0; |
| 261 | |
| 262 | switch (exp->X_op) |
| 263 | { |
| 264 | case O_absent: |
| 265 | break; |
| 266 | |
| 267 | case O_register: |
| 268 | as_bad (_("register value used as expression")); |
| 269 | break; |
| 270 | |
| 271 | case O_add: |
| 272 | /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if |
| 273 | the difference expression cannot immediately be reduced. */ |
| 274 | { |
| 275 | symbolS *stmp = make_expr_symbol (exp); |
| 276 | |
| 277 | exp->X_op = O_symbol; |
| 278 | exp->X_op_symbol = 0; |
| 279 | exp->X_add_symbol = stmp; |
| 280 | exp->X_add_number = 0; |
| 281 | |
| 282 | return fix_new_exp (frag, where, size, exp, pcrel, r_type); |
| 283 | } |
| 284 | |
| 285 | case O_symbol_rva: |
| 286 | add = exp->X_add_symbol; |
| 287 | off = exp->X_add_number; |
| 288 | r_type = BFD_RELOC_RVA; |
| 289 | break; |
| 290 | |
| 291 | case O_uminus: |
| 292 | sub = exp->X_add_symbol; |
| 293 | off = exp->X_add_number; |
| 294 | break; |
| 295 | |
| 296 | case O_subtract: |
| 297 | sub = exp->X_op_symbol; |
| 298 | /* Fall through. */ |
| 299 | case O_symbol: |
| 300 | add = exp->X_add_symbol; |
| 301 | /* Fall through. */ |
| 302 | case O_constant: |
| 303 | off = exp->X_add_number; |
| 304 | break; |
| 305 | |
| 306 | default: |
| 307 | add = make_expr_symbol (exp); |
| 308 | break; |
| 309 | } |
| 310 | |
| 311 | return fix_new_internal (frag, where, size, add, sub, off, pcrel, r_type); |
| 312 | } |
| 313 | |
| 314 | /* Generic function to determine whether a fixup requires a relocation. */ |
| 315 | int |
| 316 | generic_force_reloc (fixS *fix) |
| 317 | { |
| 318 | if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT |
| 319 | || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY) |
| 320 | return 1; |
| 321 | |
| 322 | if (fix->fx_addsy == NULL) |
| 323 | return 0; |
| 324 | |
| 325 | return S_FORCE_RELOC (fix->fx_addsy, fix->fx_subsy == NULL); |
| 326 | } |
| 327 | |
| 328 | /* Append a string onto another string, bumping the pointer along. */ |
| 329 | void |
| 330 | append (char **charPP, char *fromP, unsigned long length) |
| 331 | { |
| 332 | /* Don't trust memcpy() of 0 chars. */ |
| 333 | if (length == 0) |
| 334 | return; |
| 335 | |
| 336 | memcpy (*charPP, fromP, length); |
| 337 | *charPP += length; |
| 338 | } |
| 339 | |
| 340 | /* This routine records the largest alignment seen for each segment. |
| 341 | If the beginning of the segment is aligned on the worst-case |
| 342 | boundary, all of the other alignments within it will work. At |
| 343 | least one object format really uses this info. */ |
| 344 | |
| 345 | void |
| 346 | record_alignment (/* Segment to which alignment pertains. */ |
| 347 | segT seg, |
| 348 | /* Alignment, as a power of 2 (e.g., 1 => 2-byte |
| 349 | boundary, 2 => 4-byte boundary, etc.) */ |
| 350 | int align) |
| 351 | { |
| 352 | if (seg == absolute_section) |
| 353 | return; |
| 354 | |
| 355 | if ((unsigned int) align > bfd_get_section_alignment (stdoutput, seg)) |
| 356 | bfd_set_section_alignment (stdoutput, seg, align); |
| 357 | } |
| 358 | |
| 359 | int |
| 360 | get_recorded_alignment (segT seg) |
| 361 | { |
| 362 | if (seg == absolute_section) |
| 363 | return 0; |
| 364 | |
| 365 | return bfd_get_section_alignment (stdoutput, seg); |
| 366 | } |
| 367 | |
| 368 | /* Reset the section indices after removing the gas created sections. */ |
| 369 | |
| 370 | static void |
| 371 | renumber_sections (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *countparg) |
| 372 | { |
| 373 | int *countp = (int *) countparg; |
| 374 | |
| 375 | sec->index = *countp; |
| 376 | ++*countp; |
| 377 | } |
| 378 | |
| 379 | static fragS * |
| 380 | chain_frchains_together_1 (segT section, struct frchain *frchp) |
| 381 | { |
| 382 | fragS dummy, *prev_frag = &dummy; |
| 383 | fixS fix_dummy, *prev_fix = &fix_dummy; |
| 384 | |
| 385 | for (; frchp; frchp = frchp->frch_next) |
| 386 | { |
| 387 | prev_frag->fr_next = frchp->frch_root; |
| 388 | prev_frag = frchp->frch_last; |
| 389 | gas_assert (prev_frag->fr_type != 0); |
| 390 | if (frchp->fix_root != (fixS *) NULL) |
| 391 | { |
| 392 | if (seg_info (section)->fix_root == (fixS *) NULL) |
| 393 | seg_info (section)->fix_root = frchp->fix_root; |
| 394 | prev_fix->fx_next = frchp->fix_root; |
| 395 | seg_info (section)->fix_tail = frchp->fix_tail; |
| 396 | prev_fix = frchp->fix_tail; |
| 397 | } |
| 398 | } |
| 399 | gas_assert (prev_frag->fr_type != 0); |
| 400 | gas_assert (prev_frag != &dummy); |
| 401 | prev_frag->fr_next = 0; |
| 402 | return prev_frag; |
| 403 | } |
| 404 | |
| 405 | static void |
| 406 | chain_frchains_together (bfd *abfd ATTRIBUTE_UNUSED, |
| 407 | segT section, |
| 408 | void *xxx ATTRIBUTE_UNUSED) |
| 409 | { |
| 410 | segment_info_type *info; |
| 411 | |
| 412 | /* BFD may have introduced its own sections without using |
| 413 | subseg_new, so it is possible that seg_info is NULL. */ |
| 414 | info = seg_info (section); |
| 415 | if (info != (segment_info_type *) NULL) |
| 416 | info->frchainP->frch_last |
| 417 | = chain_frchains_together_1 (section, info->frchainP); |
| 418 | |
| 419 | /* Now that we've chained the frags together, we must add new fixups |
| 420 | to the segment, not to the frag chain. */ |
| 421 | frags_chained = 1; |
| 422 | } |
| 423 | |
| 424 | static void |
| 425 | cvt_frag_to_fill (segT sec ATTRIBUTE_UNUSED, fragS *fragP) |
| 426 | { |
| 427 | switch (fragP->fr_type) |
| 428 | { |
| 429 | case rs_align: |
| 430 | case rs_align_code: |
| 431 | case rs_align_test: |
| 432 | case rs_org: |
| 433 | case rs_space: |
| 434 | #ifdef HANDLE_ALIGN |
| 435 | HANDLE_ALIGN (fragP); |
| 436 | #endif |
| 437 | know (fragP->fr_next != NULL); |
| 438 | fragP->fr_offset = (fragP->fr_next->fr_address |
| 439 | - fragP->fr_address |
| 440 | - fragP->fr_fix) / fragP->fr_var; |
| 441 | if (fragP->fr_offset < 0) |
| 442 | { |
| 443 | as_bad_where (fragP->fr_file, fragP->fr_line, |
| 444 | _("attempt to .org/.space backwards? (%ld)"), |
| 445 | (long) fragP->fr_offset); |
| 446 | fragP->fr_offset = 0; |
| 447 | } |
| 448 | fragP->fr_type = rs_fill; |
| 449 | break; |
| 450 | |
| 451 | case rs_fill: |
| 452 | break; |
| 453 | |
| 454 | case rs_leb128: |
| 455 | { |
| 456 | valueT value = S_GET_VALUE (fragP->fr_symbol); |
| 457 | int size; |
| 458 | |
| 459 | size = output_leb128 (fragP->fr_literal + fragP->fr_fix, value, |
| 460 | fragP->fr_subtype); |
| 461 | |
| 462 | fragP->fr_fix += size; |
| 463 | fragP->fr_type = rs_fill; |
| 464 | fragP->fr_var = 0; |
| 465 | fragP->fr_offset = 0; |
| 466 | fragP->fr_symbol = NULL; |
| 467 | } |
| 468 | break; |
| 469 | |
| 470 | case rs_cfa: |
| 471 | eh_frame_convert_frag (fragP); |
| 472 | break; |
| 473 | |
| 474 | case rs_dwarf2dbg: |
| 475 | dwarf2dbg_convert_frag (fragP); |
| 476 | break; |
| 477 | |
| 478 | case rs_machine_dependent: |
| 479 | md_convert_frag (stdoutput, sec, fragP); |
| 480 | |
| 481 | gas_assert (fragP->fr_next == NULL |
| 482 | || ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address) |
| 483 | == fragP->fr_fix)); |
| 484 | |
| 485 | /* After md_convert_frag, we make the frag into a ".space 0". |
| 486 | md_convert_frag() should set up any fixSs and constants |
| 487 | required. */ |
| 488 | frag_wane (fragP); |
| 489 | break; |
| 490 | |
| 491 | #ifndef WORKING_DOT_WORD |
| 492 | case rs_broken_word: |
| 493 | { |
| 494 | struct broken_word *lie; |
| 495 | |
| 496 | if (fragP->fr_subtype) |
| 497 | { |
| 498 | fragP->fr_fix += md_short_jump_size; |
| 499 | for (lie = (struct broken_word *) (fragP->fr_symbol); |
| 500 | lie && lie->dispfrag == fragP; |
| 501 | lie = lie->next_broken_word) |
| 502 | if (lie->added == 1) |
| 503 | fragP->fr_fix += md_long_jump_size; |
| 504 | } |
| 505 | frag_wane (fragP); |
| 506 | } |
| 507 | break; |
| 508 | #endif |
| 509 | |
| 510 | default: |
| 511 | BAD_CASE (fragP->fr_type); |
| 512 | break; |
| 513 | } |
| 514 | #ifdef md_frag_check |
| 515 | md_frag_check (fragP); |
| 516 | #endif |
| 517 | } |
| 518 | |
| 519 | struct relax_seg_info |
| 520 | { |
| 521 | int pass; |
| 522 | int changed; |
| 523 | }; |
| 524 | |
| 525 | static void |
| 526 | relax_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *xxx) |
| 527 | { |
| 528 | segment_info_type *seginfo = seg_info (sec); |
| 529 | struct relax_seg_info *info = (struct relax_seg_info *) xxx; |
| 530 | |
| 531 | if (seginfo && seginfo->frchainP |
| 532 | && relax_segment (seginfo->frchainP->frch_root, sec, info->pass)) |
| 533 | info->changed = 1; |
| 534 | } |
| 535 | |
| 536 | static void |
| 537 | size_seg (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED) |
| 538 | { |
| 539 | flagword flags; |
| 540 | fragS *fragp; |
| 541 | segment_info_type *seginfo; |
| 542 | int x; |
| 543 | valueT size, newsize; |
| 544 | |
| 545 | subseg_change (sec, 0); |
| 546 | |
| 547 | seginfo = seg_info (sec); |
| 548 | if (seginfo && seginfo->frchainP) |
| 549 | { |
| 550 | for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next) |
| 551 | cvt_frag_to_fill (sec, fragp); |
| 552 | for (fragp = seginfo->frchainP->frch_root; |
| 553 | fragp->fr_next; |
| 554 | fragp = fragp->fr_next) |
| 555 | /* Walk to last elt. */ |
| 556 | ; |
| 557 | size = fragp->fr_address + fragp->fr_fix; |
| 558 | } |
| 559 | else |
| 560 | size = 0; |
| 561 | |
| 562 | flags = bfd_get_section_flags (abfd, sec); |
| 563 | if (size == 0 && bfd_get_section_size (sec) != 0 && |
| 564 | (flags & SEC_HAS_CONTENTS) != 0) |
| 565 | return; |
| 566 | |
| 567 | if (size > 0 && ! seginfo->bss) |
| 568 | flags |= SEC_HAS_CONTENTS; |
| 569 | |
| 570 | flags &= ~SEC_RELOC; |
| 571 | x = bfd_set_section_flags (abfd, sec, flags); |
| 572 | gas_assert (x); |
| 573 | |
| 574 | newsize = md_section_align (sec, size); |
| 575 | x = bfd_set_section_size (abfd, sec, newsize); |
| 576 | gas_assert (x); |
| 577 | |
| 578 | /* If the size had to be rounded up, add some padding in the last |
| 579 | non-empty frag. */ |
| 580 | gas_assert (newsize >= size); |
| 581 | if (size != newsize) |
| 582 | { |
| 583 | fragS *last = seginfo->frchainP->frch_last; |
| 584 | fragp = seginfo->frchainP->frch_root; |
| 585 | while (fragp->fr_next != last) |
| 586 | fragp = fragp->fr_next; |
| 587 | last->fr_address = size; |
| 588 | if ((newsize - size) % fragp->fr_var == 0) |
| 589 | fragp->fr_offset += (newsize - size) / fragp->fr_var; |
| 590 | else |
| 591 | /* If we hit this abort, it's likely due to subsegs_finish not |
| 592 | providing sufficient alignment on the last frag, and the |
| 593 | machine dependent code using alignment frags with fr_var |
| 594 | greater than 1. */ |
| 595 | abort (); |
| 596 | } |
| 597 | |
| 598 | #ifdef tc_frob_section |
| 599 | tc_frob_section (sec); |
| 600 | #endif |
| 601 | #ifdef obj_frob_section |
| 602 | obj_frob_section (sec); |
| 603 | #endif |
| 604 | } |
| 605 | |
| 606 | #ifdef DEBUG2 |
| 607 | static void |
| 608 | dump_section_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, FILE *stream) |
| 609 | { |
| 610 | segment_info_type *seginfo = seg_info (sec); |
| 611 | fixS *fixp = seginfo->fix_root; |
| 612 | |
| 613 | if (!fixp) |
| 614 | return; |
| 615 | |
| 616 | fprintf (stream, "sec %s relocs:\n", sec->name); |
| 617 | while (fixp) |
| 618 | { |
| 619 | symbolS *s = fixp->fx_addsy; |
| 620 | |
| 621 | fprintf (stream, " %08lx: type %d ", (unsigned long) fixp, |
| 622 | (int) fixp->fx_r_type); |
| 623 | if (s == NULL) |
| 624 | fprintf (stream, "no sym\n"); |
| 625 | else |
| 626 | { |
| 627 | print_symbol_value_1 (stream, s); |
| 628 | fprintf (stream, "\n"); |
| 629 | } |
| 630 | fixp = fixp->fx_next; |
| 631 | } |
| 632 | } |
| 633 | #else |
| 634 | #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0) |
| 635 | #endif |
| 636 | |
| 637 | #ifndef EMIT_SECTION_SYMBOLS |
| 638 | #define EMIT_SECTION_SYMBOLS 1 |
| 639 | #endif |
| 640 | |
| 641 | /* Resolve U.A.OFFSET_SYM and U.A.SYM fields of RELOC_LIST entries, |
| 642 | and check for validity. Convert RELOC_LIST from using U.A fields |
| 643 | to U.B fields. */ |
| 644 | static void |
| 645 | resolve_reloc_expr_symbols (void) |
| 646 | { |
| 647 | struct reloc_list *r; |
| 648 | |
| 649 | for (r = reloc_list; r; r = r->next) |
| 650 | { |
| 651 | expressionS *symval; |
| 652 | symbolS *sym; |
| 653 | bfd_vma offset, addend; |
| 654 | asection *sec; |
| 655 | reloc_howto_type *howto; |
| 656 | |
| 657 | resolve_symbol_value (r->u.a.offset_sym); |
| 658 | symval = symbol_get_value_expression (r->u.a.offset_sym); |
| 659 | |
| 660 | offset = 0; |
| 661 | sym = NULL; |
| 662 | if (symval->X_op == O_constant) |
| 663 | sym = r->u.a.offset_sym; |
| 664 | else if (symval->X_op == O_symbol) |
| 665 | { |
| 666 | sym = symval->X_add_symbol; |
| 667 | offset = symval->X_add_number; |
| 668 | symval = symbol_get_value_expression (symval->X_add_symbol); |
| 669 | } |
| 670 | if (sym == NULL |
| 671 | || symval->X_op != O_constant |
| 672 | || (sec = S_GET_SEGMENT (sym)) == NULL |
| 673 | || !SEG_NORMAL (sec)) |
| 674 | { |
| 675 | as_bad_where (r->file, r->line, _("invalid offset expression")); |
| 676 | sec = NULL; |
| 677 | } |
| 678 | else |
| 679 | offset += S_GET_VALUE (sym); |
| 680 | |
| 681 | sym = NULL; |
| 682 | addend = r->u.a.addend; |
| 683 | if (r->u.a.sym != NULL) |
| 684 | { |
| 685 | resolve_symbol_value (r->u.a.sym); |
| 686 | symval = symbol_get_value_expression (r->u.a.sym); |
| 687 | if (symval->X_op == O_constant) |
| 688 | sym = r->u.a.sym; |
| 689 | else if (symval->X_op == O_symbol) |
| 690 | { |
| 691 | sym = symval->X_add_symbol; |
| 692 | addend += symval->X_add_number; |
| 693 | symval = symbol_get_value_expression (symval->X_add_symbol); |
| 694 | } |
| 695 | if (symval->X_op != O_constant) |
| 696 | { |
| 697 | as_bad_where (r->file, r->line, _("invalid reloc expression")); |
| 698 | sec = NULL; |
| 699 | } |
| 700 | else if (sym != NULL) |
| 701 | symbol_mark_used_in_reloc (sym); |
| 702 | } |
| 703 | if (sym == NULL) |
| 704 | { |
| 705 | if (abs_section_sym == NULL) |
| 706 | abs_section_sym = section_symbol (absolute_section); |
| 707 | sym = abs_section_sym; |
| 708 | } |
| 709 | |
| 710 | howto = r->u.a.howto; |
| 711 | |
| 712 | r->u.b.sec = sec; |
| 713 | r->u.b.s = symbol_get_bfdsym (sym); |
| 714 | r->u.b.r.sym_ptr_ptr = &r->u.b.s; |
| 715 | r->u.b.r.address = offset; |
| 716 | r->u.b.r.addend = addend; |
| 717 | r->u.b.r.howto = howto; |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | /* This pass over fixups decides whether symbols can be replaced with |
| 722 | section symbols. */ |
| 723 | |
| 724 | static void |
| 725 | adjust_reloc_syms (bfd *abfd ATTRIBUTE_UNUSED, |
| 726 | asection *sec, |
| 727 | void *xxx ATTRIBUTE_UNUSED) |
| 728 | { |
| 729 | segment_info_type *seginfo = seg_info (sec); |
| 730 | fixS *fixp; |
| 731 | |
| 732 | if (seginfo == NULL) |
| 733 | return; |
| 734 | |
| 735 | dump_section_relocs (abfd, sec, stderr); |
| 736 | |
| 737 | for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next) |
| 738 | if (fixp->fx_done) |
| 739 | /* Ignore it. */ |
| 740 | ; |
| 741 | else if (fixp->fx_addsy) |
| 742 | { |
| 743 | symbolS *sym; |
| 744 | asection *symsec; |
| 745 | |
| 746 | #ifdef DEBUG5 |
| 747 | fprintf (stderr, "\n\nadjusting fixup:\n"); |
| 748 | print_fixup (fixp); |
| 749 | #endif |
| 750 | |
| 751 | sym = fixp->fx_addsy; |
| 752 | |
| 753 | /* All symbols should have already been resolved at this |
| 754 | point. It is possible to see unresolved expression |
| 755 | symbols, though, since they are not in the regular symbol |
| 756 | table. */ |
| 757 | resolve_symbol_value (sym); |
| 758 | |
| 759 | if (fixp->fx_subsy != NULL) |
| 760 | resolve_symbol_value (fixp->fx_subsy); |
| 761 | |
| 762 | /* If this symbol is equated to an undefined or common symbol, |
| 763 | convert the fixup to being against that symbol. */ |
| 764 | while (symbol_equated_reloc_p (sym) |
| 765 | || S_IS_WEAKREFR (sym)) |
| 766 | { |
| 767 | symbolS *newsym = symbol_get_value_expression (sym)->X_add_symbol; |
| 768 | if (sym == newsym) |
| 769 | break; |
| 770 | fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number; |
| 771 | fixp->fx_addsy = newsym; |
| 772 | sym = newsym; |
| 773 | } |
| 774 | |
| 775 | if (symbol_mri_common_p (sym)) |
| 776 | { |
| 777 | fixp->fx_offset += S_GET_VALUE (sym); |
| 778 | fixp->fx_addsy = symbol_get_value_expression (sym)->X_add_symbol; |
| 779 | continue; |
| 780 | } |
| 781 | |
| 782 | /* If the symbol is undefined, common, weak, or global (ELF |
| 783 | shared libs), we can't replace it with the section symbol. */ |
| 784 | if (S_FORCE_RELOC (fixp->fx_addsy, 1)) |
| 785 | continue; |
| 786 | |
| 787 | /* Is there some other (target cpu dependent) reason we can't adjust |
| 788 | this one? (E.g. relocations involving function addresses on |
| 789 | the PA. */ |
| 790 | #ifdef tc_fix_adjustable |
| 791 | if (! tc_fix_adjustable (fixp)) |
| 792 | continue; |
| 793 | #endif |
| 794 | |
| 795 | /* Since we're reducing to section symbols, don't attempt to reduce |
| 796 | anything that's already using one. */ |
| 797 | if (symbol_section_p (sym)) |
| 798 | continue; |
| 799 | |
| 800 | symsec = S_GET_SEGMENT (sym); |
| 801 | if (symsec == NULL) |
| 802 | abort (); |
| 803 | |
| 804 | if (bfd_is_abs_section (symsec)) |
| 805 | { |
| 806 | /* The fixup_segment routine normally will not use this |
| 807 | symbol in a relocation. */ |
| 808 | continue; |
| 809 | } |
| 810 | |
| 811 | /* Don't try to reduce relocs which refer to non-local symbols |
| 812 | in .linkonce sections. It can lead to confusion when a |
| 813 | debugging section refers to a .linkonce section. I hope |
| 814 | this will always be correct. */ |
| 815 | if (symsec != sec && ! S_IS_LOCAL (sym)) |
| 816 | { |
| 817 | if ((symsec->flags & SEC_LINK_ONCE) != 0 |
| 818 | || (IS_ELF |
| 819 | /* The GNU toolchain uses an extension for ELF: a |
| 820 | section beginning with the magic string |
| 821 | .gnu.linkonce is a linkonce section. */ |
| 822 | && strncmp (segment_name (symsec), ".gnu.linkonce", |
| 823 | sizeof ".gnu.linkonce" - 1) == 0)) |
| 824 | continue; |
| 825 | } |
| 826 | |
| 827 | /* Never adjust a reloc against local symbol in a merge section |
| 828 | with non-zero addend. */ |
| 829 | if ((symsec->flags & SEC_MERGE) != 0 |
| 830 | && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL)) |
| 831 | continue; |
| 832 | |
| 833 | /* Never adjust a reloc against TLS local symbol. */ |
| 834 | if ((symsec->flags & SEC_THREAD_LOCAL) != 0) |
| 835 | continue; |
| 836 | |
| 837 | /* We refetch the segment when calling section_symbol, rather |
| 838 | than using symsec, because S_GET_VALUE may wind up changing |
| 839 | the section when it calls resolve_symbol_value. */ |
| 840 | fixp->fx_offset += S_GET_VALUE (sym); |
| 841 | fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym)); |
| 842 | #ifdef DEBUG5 |
| 843 | fprintf (stderr, "\nadjusted fixup:\n"); |
| 844 | print_fixup (fixp); |
| 845 | #endif |
| 846 | } |
| 847 | |
| 848 | dump_section_relocs (abfd, sec, stderr); |
| 849 | } |
| 850 | |
| 851 | /* fixup_segment() |
| 852 | |
| 853 | Go through all the fixS's in a segment and see which ones can be |
| 854 | handled now. (These consist of fixS where we have since discovered |
| 855 | the value of a symbol, or the address of the frag involved.) |
| 856 | For each one, call md_apply_fix to put the fix into the frag data. |
| 857 | |
| 858 | Result is a count of how many relocation structs will be needed to |
| 859 | handle the remaining fixS's that we couldn't completely handle here. |
| 860 | These will be output later by emit_relocations(). */ |
| 861 | |
| 862 | static long |
| 863 | fixup_segment (fixS *fixP, segT this_segment) |
| 864 | { |
| 865 | long seg_reloc_count = 0; |
| 866 | valueT add_number; |
| 867 | fragS *fragP; |
| 868 | segT add_symbol_segment = absolute_section; |
| 869 | |
| 870 | if (fixP != NULL && abs_section_sym == NULL) |
| 871 | abs_section_sym = section_symbol (absolute_section); |
| 872 | |
| 873 | /* If the linker is doing the relaxing, we must not do any fixups. |
| 874 | |
| 875 | Well, strictly speaking that's not true -- we could do any that |
| 876 | are PC-relative and don't cross regions that could change size. |
| 877 | And for the i960 we might be able to turn callx/callj into bal |
| 878 | anyways in cases where we know the maximum displacement. */ |
| 879 | if (linkrelax && TC_LINKRELAX_FIXUP (this_segment)) |
| 880 | { |
| 881 | for (; fixP; fixP = fixP->fx_next) |
| 882 | if (!fixP->fx_done) |
| 883 | { |
| 884 | if (fixP->fx_addsy == NULL) |
| 885 | { |
| 886 | /* There was no symbol required by this relocation. |
| 887 | However, BFD doesn't really handle relocations |
| 888 | without symbols well. So fake up a local symbol in |
| 889 | the absolute section. */ |
| 890 | fixP->fx_addsy = abs_section_sym; |
| 891 | } |
| 892 | symbol_mark_used_in_reloc (fixP->fx_addsy); |
| 893 | if (fixP->fx_subsy != NULL) |
| 894 | symbol_mark_used_in_reloc (fixP->fx_subsy); |
| 895 | seg_reloc_count++; |
| 896 | } |
| 897 | TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count); |
| 898 | return seg_reloc_count; |
| 899 | } |
| 900 | |
| 901 | for (; fixP; fixP = fixP->fx_next) |
| 902 | { |
| 903 | #ifdef DEBUG5 |
| 904 | fprintf (stderr, "\nprocessing fixup:\n"); |
| 905 | print_fixup (fixP); |
| 906 | #endif |
| 907 | |
| 908 | fragP = fixP->fx_frag; |
| 909 | know (fragP); |
| 910 | #ifdef TC_VALIDATE_FIX |
| 911 | TC_VALIDATE_FIX (fixP, this_segment, skip); |
| 912 | #endif |
| 913 | add_number = fixP->fx_offset; |
| 914 | |
| 915 | if (fixP->fx_addsy != NULL) |
| 916 | add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy); |
| 917 | |
| 918 | if (fixP->fx_subsy != NULL) |
| 919 | { |
| 920 | segT sub_symbol_segment; |
| 921 | resolve_symbol_value (fixP->fx_subsy); |
| 922 | sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy); |
| 923 | if (fixP->fx_addsy != NULL |
| 924 | && sub_symbol_segment == add_symbol_segment |
| 925 | && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment)) |
| 926 | { |
| 927 | add_number += S_GET_VALUE (fixP->fx_addsy); |
| 928 | add_number -= S_GET_VALUE (fixP->fx_subsy); |
| 929 | fixP->fx_offset = add_number; |
| 930 | fixP->fx_addsy = NULL; |
| 931 | fixP->fx_subsy = NULL; |
| 932 | #ifdef TC_M68K |
| 933 | /* See the comment below about 68k weirdness. */ |
| 934 | fixP->fx_pcrel = 0; |
| 935 | #endif |
| 936 | } |
| 937 | else if (sub_symbol_segment == absolute_section |
| 938 | && !TC_FORCE_RELOCATION_SUB_ABS (fixP, add_symbol_segment)) |
| 939 | { |
| 940 | add_number -= S_GET_VALUE (fixP->fx_subsy); |
| 941 | fixP->fx_offset = add_number; |
| 942 | fixP->fx_subsy = NULL; |
| 943 | } |
| 944 | else if (sub_symbol_segment == this_segment |
| 945 | && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP, add_symbol_segment)) |
| 946 | { |
| 947 | add_number -= S_GET_VALUE (fixP->fx_subsy); |
| 948 | fixP->fx_offset = (add_number + fixP->fx_dot_value |
| 949 | + fixP->fx_frag->fr_address); |
| 950 | |
| 951 | /* Make it pc-relative. If the back-end code has not |
| 952 | selected a pc-relative reloc, cancel the adjustment |
| 953 | we do later on all pc-relative relocs. */ |
| 954 | if (0 |
| 955 | #ifdef TC_M68K |
| 956 | /* Do this for m68k even if it's already described |
| 957 | as pc-relative. On the m68k, an operand of |
| 958 | "pc@(foo-.-2)" should address "foo" in a |
| 959 | pc-relative mode. */ |
| 960 | || 1 |
| 961 | #endif |
| 962 | || !fixP->fx_pcrel) |
| 963 | add_number += MD_PCREL_FROM_SECTION (fixP, this_segment); |
| 964 | fixP->fx_subsy = NULL; |
| 965 | fixP->fx_pcrel = 1; |
| 966 | } |
| 967 | else if (!TC_VALIDATE_FIX_SUB (fixP, add_symbol_segment)) |
| 968 | { |
| 969 | if (!md_register_arithmetic |
| 970 | && (add_symbol_segment == reg_section |
| 971 | || sub_symbol_segment == reg_section)) |
| 972 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 973 | _("register value used as expression")); |
| 974 | else |
| 975 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 976 | _("can't resolve `%s' {%s section} - `%s' {%s section}"), |
| 977 | fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0", |
| 978 | segment_name (add_symbol_segment), |
| 979 | S_GET_NAME (fixP->fx_subsy), |
| 980 | segment_name (sub_symbol_segment)); |
| 981 | } |
| 982 | } |
| 983 | |
| 984 | if (fixP->fx_addsy) |
| 985 | { |
| 986 | if (add_symbol_segment == this_segment |
| 987 | && !TC_FORCE_RELOCATION_LOCAL (fixP)) |
| 988 | { |
| 989 | /* This fixup was made when the symbol's segment was |
| 990 | SEG_UNKNOWN, but it is now in the local segment. |
| 991 | So we know how to do the address without relocation. */ |
| 992 | add_number += S_GET_VALUE (fixP->fx_addsy); |
| 993 | fixP->fx_offset = add_number; |
| 994 | if (fixP->fx_pcrel) |
| 995 | add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment); |
| 996 | fixP->fx_addsy = NULL; |
| 997 | fixP->fx_pcrel = 0; |
| 998 | } |
| 999 | else if (add_symbol_segment == absolute_section |
| 1000 | && !TC_FORCE_RELOCATION_ABS (fixP)) |
| 1001 | { |
| 1002 | add_number += S_GET_VALUE (fixP->fx_addsy); |
| 1003 | fixP->fx_offset = add_number; |
| 1004 | fixP->fx_addsy = NULL; |
| 1005 | } |
| 1006 | else if (add_symbol_segment != undefined_section |
| 1007 | && ! bfd_is_com_section (add_symbol_segment) |
| 1008 | && MD_APPLY_SYM_VALUE (fixP)) |
| 1009 | add_number += S_GET_VALUE (fixP->fx_addsy); |
| 1010 | } |
| 1011 | |
| 1012 | if (fixP->fx_pcrel) |
| 1013 | { |
| 1014 | add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment); |
| 1015 | if (!fixP->fx_done && fixP->fx_addsy == NULL) |
| 1016 | { |
| 1017 | /* There was no symbol required by this relocation. |
| 1018 | However, BFD doesn't really handle relocations |
| 1019 | without symbols well. So fake up a local symbol in |
| 1020 | the absolute section. */ |
| 1021 | fixP->fx_addsy = abs_section_sym; |
| 1022 | } |
| 1023 | } |
| 1024 | |
| 1025 | if (!fixP->fx_done) |
| 1026 | md_apply_fix (fixP, &add_number, this_segment); |
| 1027 | |
| 1028 | if (!fixP->fx_done) |
| 1029 | { |
| 1030 | ++seg_reloc_count; |
| 1031 | if (fixP->fx_addsy == NULL) |
| 1032 | fixP->fx_addsy = abs_section_sym; |
| 1033 | symbol_mark_used_in_reloc (fixP->fx_addsy); |
| 1034 | if (fixP->fx_subsy != NULL) |
| 1035 | symbol_mark_used_in_reloc (fixP->fx_subsy); |
| 1036 | } |
| 1037 | |
| 1038 | if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0) |
| 1039 | { |
| 1040 | if (fixP->fx_size < sizeof (valueT)) |
| 1041 | { |
| 1042 | valueT mask; |
| 1043 | |
| 1044 | mask = 0; |
| 1045 | mask--; /* Set all bits to one. */ |
| 1046 | mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0); |
| 1047 | if ((add_number & mask) != 0 && (add_number & mask) != mask) |
| 1048 | { |
| 1049 | char buf[50], buf2[50]; |
| 1050 | sprint_value (buf, fragP->fr_address + fixP->fx_where); |
| 1051 | if (add_number > 1000) |
| 1052 | sprint_value (buf2, add_number); |
| 1053 | else |
| 1054 | sprintf (buf2, "%ld", (long) add_number); |
| 1055 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1056 | _("value of %s too large for field of %d bytes at %s"), |
| 1057 | buf2, fixP->fx_size, buf); |
| 1058 | } /* Generic error checking. */ |
| 1059 | } |
| 1060 | #ifdef WARN_SIGNED_OVERFLOW_WORD |
| 1061 | /* Warn if a .word value is too large when treated as a signed |
| 1062 | number. We already know it is not too negative. This is to |
| 1063 | catch over-large switches generated by gcc on the 68k. */ |
| 1064 | if (!flag_signed_overflow_ok |
| 1065 | && fixP->fx_size == 2 |
| 1066 | && add_number > 0x7fff) |
| 1067 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 1068 | _("signed .word overflow; switch may be too large; %ld at 0x%lx"), |
| 1069 | (long) add_number, |
| 1070 | (long) (fragP->fr_address + fixP->fx_where)); |
| 1071 | #endif |
| 1072 | } /* Not a bit fix. */ |
| 1073 | |
| 1074 | #ifdef TC_VALIDATE_FIX |
| 1075 | skip: ATTRIBUTE_UNUSED_LABEL |
| 1076 | ; |
| 1077 | #endif |
| 1078 | #ifdef DEBUG5 |
| 1079 | fprintf (stderr, "result:\n"); |
| 1080 | print_fixup (fixP); |
| 1081 | #endif |
| 1082 | } /* For each fixS in this segment. */ |
| 1083 | |
| 1084 | TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count); |
| 1085 | return seg_reloc_count; |
| 1086 | } |
| 1087 | |
| 1088 | static void |
| 1089 | fix_segment (bfd *abfd ATTRIBUTE_UNUSED, |
| 1090 | asection *sec, |
| 1091 | void *xxx ATTRIBUTE_UNUSED) |
| 1092 | { |
| 1093 | segment_info_type *seginfo = seg_info (sec); |
| 1094 | |
| 1095 | fixup_segment (seginfo->fix_root, sec); |
| 1096 | } |
| 1097 | |
| 1098 | static void |
| 1099 | install_reloc (asection *sec, arelent *reloc, fragS *fragp, |
| 1100 | char *file, unsigned int line) |
| 1101 | { |
| 1102 | char *err; |
| 1103 | bfd_reloc_status_type s; |
| 1104 | asymbol *sym; |
| 1105 | |
| 1106 | if (reloc->sym_ptr_ptr != NULL |
| 1107 | && (sym = *reloc->sym_ptr_ptr) != NULL |
| 1108 | && (sym->flags & BSF_KEEP) == 0 |
| 1109 | && ((sym->flags & BSF_SECTION_SYM) == 0 |
| 1110 | || (EMIT_SECTION_SYMBOLS |
| 1111 | && !bfd_is_abs_section (sym->section)))) |
| 1112 | as_bad_where (file, line, _("redefined symbol cannot be used on reloc")); |
| 1113 | |
| 1114 | s = bfd_install_relocation (stdoutput, reloc, |
| 1115 | fragp->fr_literal, fragp->fr_address, |
| 1116 | sec, &err); |
| 1117 | switch (s) |
| 1118 | { |
| 1119 | case bfd_reloc_ok: |
| 1120 | break; |
| 1121 | case bfd_reloc_overflow: |
| 1122 | as_bad_where (file, line, _("relocation overflow")); |
| 1123 | break; |
| 1124 | case bfd_reloc_outofrange: |
| 1125 | as_bad_where (file, line, _("relocation out of range")); |
| 1126 | break; |
| 1127 | default: |
| 1128 | as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"), |
| 1129 | file, line, s); |
| 1130 | } |
| 1131 | } |
| 1132 | |
| 1133 | static void |
| 1134 | write_relocs (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED) |
| 1135 | { |
| 1136 | segment_info_type *seginfo = seg_info (sec); |
| 1137 | unsigned int i; |
| 1138 | unsigned int n; |
| 1139 | struct reloc_list *my_reloc_list, **rp, *r; |
| 1140 | arelent **relocs; |
| 1141 | fixS *fixp; |
| 1142 | |
| 1143 | /* If seginfo is NULL, we did not create this section; don't do |
| 1144 | anything with it. */ |
| 1145 | if (seginfo == NULL) |
| 1146 | return; |
| 1147 | |
| 1148 | n = 0; |
| 1149 | for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next) |
| 1150 | if (!fixp->fx_done) |
| 1151 | n++; |
| 1152 | |
| 1153 | #ifdef RELOC_EXPANSION_POSSIBLE |
| 1154 | n *= MAX_RELOC_EXPANSION; |
| 1155 | #endif |
| 1156 | |
| 1157 | /* Extract relocs for this section from reloc_list. */ |
| 1158 | rp = &reloc_list; |
| 1159 | my_reloc_list = NULL; |
| 1160 | while ((r = *rp) != NULL) |
| 1161 | { |
| 1162 | if (r->u.b.sec == sec) |
| 1163 | { |
| 1164 | *rp = r->next; |
| 1165 | r->next = my_reloc_list; |
| 1166 | my_reloc_list = r; |
| 1167 | n++; |
| 1168 | } |
| 1169 | else |
| 1170 | rp = &r->next; |
| 1171 | } |
| 1172 | |
| 1173 | relocs = (arelent **) xcalloc (n, sizeof (arelent *)); |
| 1174 | |
| 1175 | i = 0; |
| 1176 | for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next) |
| 1177 | { |
| 1178 | int j; |
| 1179 | int fx_size, slack; |
| 1180 | offsetT loc; |
| 1181 | |
| 1182 | if (fixp->fx_done) |
| 1183 | continue; |
| 1184 | |
| 1185 | fx_size = fixp->fx_size; |
| 1186 | slack = TC_FX_SIZE_SLACK (fixp); |
| 1187 | if (slack > 0) |
| 1188 | fx_size = fx_size > slack ? fx_size - slack : 0; |
| 1189 | loc = fixp->fx_where + fx_size; |
| 1190 | if (slack >= 0 && loc > fixp->fx_frag->fr_fix) |
| 1191 | as_bad_where (fixp->fx_file, fixp->fx_line, |
| 1192 | _("internal error: fixup not contained within frag")); |
| 1193 | |
| 1194 | #ifndef RELOC_EXPANSION_POSSIBLE |
| 1195 | { |
| 1196 | arelent *reloc = tc_gen_reloc (sec, fixp); |
| 1197 | |
| 1198 | if (!reloc) |
| 1199 | continue; |
| 1200 | relocs[i++] = reloc; |
| 1201 | j = 1; |
| 1202 | } |
| 1203 | #else |
| 1204 | { |
| 1205 | arelent **reloc = tc_gen_reloc (sec, fixp); |
| 1206 | |
| 1207 | for (j = 0; reloc[j]; j++) |
| 1208 | relocs[i++] = reloc[j]; |
| 1209 | } |
| 1210 | #endif |
| 1211 | |
| 1212 | for ( ; j != 0; --j) |
| 1213 | install_reloc (sec, relocs[i - j], fixp->fx_frag, |
| 1214 | fixp->fx_file, fixp->fx_line); |
| 1215 | } |
| 1216 | n = i; |
| 1217 | |
| 1218 | #ifdef DEBUG4 |
| 1219 | { |
| 1220 | unsigned int i, j, nsyms; |
| 1221 | asymbol **sympp; |
| 1222 | sympp = bfd_get_outsymbols (stdoutput); |
| 1223 | nsyms = bfd_get_symcount (stdoutput); |
| 1224 | for (i = 0; i < n; i++) |
| 1225 | if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0) |
| 1226 | { |
| 1227 | for (j = 0; j < nsyms; j++) |
| 1228 | if (sympp[j] == *relocs[i]->sym_ptr_ptr) |
| 1229 | break; |
| 1230 | if (j == nsyms) |
| 1231 | abort (); |
| 1232 | } |
| 1233 | } |
| 1234 | #endif |
| 1235 | |
| 1236 | for (r = my_reloc_list; r != NULL; r = r->next) |
| 1237 | { |
| 1238 | fragS *f; |
| 1239 | for (f = seginfo->frchainP->frch_root; f; f = f->fr_next) |
| 1240 | if (f->fr_address <= r->u.b.r.address |
| 1241 | && r->u.b.r.address < f->fr_address + f->fr_fix) |
| 1242 | break; |
| 1243 | if (f == NULL) |
| 1244 | as_bad_where (r->file, r->line, |
| 1245 | _("reloc not within (fixed part of) section")); |
| 1246 | else |
| 1247 | { |
| 1248 | relocs[n++] = &r->u.b.r; |
| 1249 | install_reloc (sec, &r->u.b.r, f, r->file, r->line); |
| 1250 | } |
| 1251 | } |
| 1252 | |
| 1253 | if (n) |
| 1254 | { |
| 1255 | flagword flags = bfd_get_section_flags (abfd, sec); |
| 1256 | flags |= SEC_RELOC; |
| 1257 | bfd_set_section_flags (abfd, sec, flags); |
| 1258 | bfd_set_reloc (stdoutput, sec, relocs, n); |
| 1259 | } |
| 1260 | |
| 1261 | #ifdef SET_SECTION_RELOCS |
| 1262 | SET_SECTION_RELOCS (sec, relocs, n); |
| 1263 | #endif |
| 1264 | |
| 1265 | #ifdef DEBUG3 |
| 1266 | { |
| 1267 | unsigned int i; |
| 1268 | arelent *r; |
| 1269 | asymbol *s; |
| 1270 | fprintf (stderr, "relocs for sec %s\n", sec->name); |
| 1271 | for (i = 0; i < n; i++) |
| 1272 | { |
| 1273 | r = relocs[i]; |
| 1274 | s = *r->sym_ptr_ptr; |
| 1275 | fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n", |
| 1276 | i, r, (unsigned long)r->address, s->name, (unsigned long)r->addend); |
| 1277 | } |
| 1278 | } |
| 1279 | #endif |
| 1280 | } |
| 1281 | |
| 1282 | static void |
| 1283 | write_contents (bfd *abfd ATTRIBUTE_UNUSED, |
| 1284 | asection *sec, |
| 1285 | void *xxx ATTRIBUTE_UNUSED) |
| 1286 | { |
| 1287 | segment_info_type *seginfo = seg_info (sec); |
| 1288 | addressT offset = 0; |
| 1289 | fragS *f; |
| 1290 | |
| 1291 | /* Write out the frags. */ |
| 1292 | if (seginfo == NULL |
| 1293 | || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS)) |
| 1294 | return; |
| 1295 | |
| 1296 | for (f = seginfo->frchainP->frch_root; |
| 1297 | f; |
| 1298 | f = f->fr_next) |
| 1299 | { |
| 1300 | int x; |
| 1301 | addressT fill_size; |
| 1302 | char *fill_literal; |
| 1303 | offsetT count; |
| 1304 | |
| 1305 | gas_assert (f->fr_type == rs_fill); |
| 1306 | if (f->fr_fix) |
| 1307 | { |
| 1308 | x = bfd_set_section_contents (stdoutput, sec, |
| 1309 | f->fr_literal, (file_ptr) offset, |
| 1310 | (bfd_size_type) f->fr_fix); |
| 1311 | if (!x) |
| 1312 | as_fatal (_("can't write %s: %s"), stdoutput->filename, |
| 1313 | bfd_errmsg (bfd_get_error ())); |
| 1314 | offset += f->fr_fix; |
| 1315 | } |
| 1316 | fill_literal = f->fr_literal + f->fr_fix; |
| 1317 | fill_size = f->fr_var; |
| 1318 | count = f->fr_offset; |
| 1319 | gas_assert (count >= 0); |
| 1320 | if (fill_size && count) |
| 1321 | { |
| 1322 | char buf[256]; |
| 1323 | if (fill_size > sizeof (buf)) |
| 1324 | { |
| 1325 | /* Do it the old way. Can this ever happen? */ |
| 1326 | while (count--) |
| 1327 | { |
| 1328 | x = bfd_set_section_contents (stdoutput, sec, |
| 1329 | fill_literal, |
| 1330 | (file_ptr) offset, |
| 1331 | (bfd_size_type) fill_size); |
| 1332 | if (!x) |
| 1333 | as_fatal (_("can't write %s: %s"), stdoutput->filename, |
| 1334 | bfd_errmsg (bfd_get_error ())); |
| 1335 | offset += fill_size; |
| 1336 | } |
| 1337 | } |
| 1338 | else |
| 1339 | { |
| 1340 | /* Build a buffer full of fill objects and output it as |
| 1341 | often as necessary. This saves on the overhead of |
| 1342 | potentially lots of bfd_set_section_contents calls. */ |
| 1343 | int n_per_buf, i; |
| 1344 | if (fill_size == 1) |
| 1345 | { |
| 1346 | n_per_buf = sizeof (buf); |
| 1347 | memset (buf, *fill_literal, n_per_buf); |
| 1348 | } |
| 1349 | else |
| 1350 | { |
| 1351 | char *bufp; |
| 1352 | n_per_buf = sizeof (buf) / fill_size; |
| 1353 | for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size) |
| 1354 | memcpy (bufp, fill_literal, fill_size); |
| 1355 | } |
| 1356 | for (; count > 0; count -= n_per_buf) |
| 1357 | { |
| 1358 | n_per_buf = n_per_buf > count ? count : n_per_buf; |
| 1359 | x = bfd_set_section_contents |
| 1360 | (stdoutput, sec, buf, (file_ptr) offset, |
| 1361 | (bfd_size_type) n_per_buf * fill_size); |
| 1362 | if (!x) |
| 1363 | as_fatal (_("cannot write to output file")); |
| 1364 | offset += n_per_buf * fill_size; |
| 1365 | } |
| 1366 | } |
| 1367 | } |
| 1368 | } |
| 1369 | } |
| 1370 | |
| 1371 | static void |
| 1372 | merge_data_into_text (void) |
| 1373 | { |
| 1374 | seg_info (text_section)->frchainP->frch_last->fr_next = |
| 1375 | seg_info (data_section)->frchainP->frch_root; |
| 1376 | seg_info (text_section)->frchainP->frch_last = |
| 1377 | seg_info (data_section)->frchainP->frch_last; |
| 1378 | seg_info (data_section)->frchainP = 0; |
| 1379 | } |
| 1380 | |
| 1381 | static void |
| 1382 | set_symtab (void) |
| 1383 | { |
| 1384 | int nsyms; |
| 1385 | asymbol **asympp; |
| 1386 | symbolS *symp; |
| 1387 | bfd_boolean result; |
| 1388 | |
| 1389 | /* Count symbols. We can't rely on a count made by the loop in |
| 1390 | write_object_file, because *_frob_file may add a new symbol or |
| 1391 | two. */ |
| 1392 | nsyms = 0; |
| 1393 | for (symp = symbol_rootP; symp; symp = symbol_next (symp)) |
| 1394 | nsyms++; |
| 1395 | |
| 1396 | if (nsyms) |
| 1397 | { |
| 1398 | int i; |
| 1399 | bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *); |
| 1400 | |
| 1401 | asympp = (asymbol **) bfd_alloc (stdoutput, amt); |
| 1402 | symp = symbol_rootP; |
| 1403 | for (i = 0; i < nsyms; i++, symp = symbol_next (symp)) |
| 1404 | { |
| 1405 | asympp[i] = symbol_get_bfdsym (symp); |
| 1406 | if (asympp[i]->flags != BSF_SECTION_SYM |
| 1407 | || !(bfd_is_const_section (asympp[i]->section) |
| 1408 | && asympp[i]->section->symbol == asympp[i])) |
| 1409 | asympp[i]->flags |= BSF_KEEP; |
| 1410 | symbol_mark_written (symp); |
| 1411 | } |
| 1412 | } |
| 1413 | else |
| 1414 | asympp = 0; |
| 1415 | result = bfd_set_symtab (stdoutput, asympp, nsyms); |
| 1416 | gas_assert (result); |
| 1417 | symbol_table_frozen = 1; |
| 1418 | } |
| 1419 | |
| 1420 | /* Finish the subsegments. After every sub-segment, we fake an |
| 1421 | ".align ...". This conforms to BSD4.2 brane-damage. We then fake |
| 1422 | ".fill 0" because that is the kind of frag that requires least |
| 1423 | thought. ".align" frags like to have a following frag since that |
| 1424 | makes calculating their intended length trivial. */ |
| 1425 | |
| 1426 | #ifndef SUB_SEGMENT_ALIGN |
| 1427 | #ifdef HANDLE_ALIGN |
| 1428 | /* The last subsegment gets an alignment corresponding to the alignment |
| 1429 | of the section. This allows proper nop-filling at the end of |
| 1430 | code-bearing sections. */ |
| 1431 | #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \ |
| 1432 | (!(FRCHAIN)->frch_next ? get_recorded_alignment (SEG) : 0) |
| 1433 | #else |
| 1434 | #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0 |
| 1435 | #endif |
| 1436 | #endif |
| 1437 | |
| 1438 | void |
| 1439 | subsegs_finish (void) |
| 1440 | { |
| 1441 | struct frchain *frchainP; |
| 1442 | asection *s; |
| 1443 | |
| 1444 | for (s = stdoutput->sections; s; s = s->next) |
| 1445 | { |
| 1446 | segment_info_type *seginfo = seg_info (s); |
| 1447 | if (!seginfo) |
| 1448 | continue; |
| 1449 | |
| 1450 | for (frchainP = seginfo->frchainP; |
| 1451 | frchainP != NULL; |
| 1452 | frchainP = frchainP->frch_next) |
| 1453 | { |
| 1454 | int alignment = 0; |
| 1455 | |
| 1456 | subseg_set (s, frchainP->frch_subseg); |
| 1457 | |
| 1458 | /* This now gets called even if we had errors. In that case, |
| 1459 | any alignment is meaningless, and, moreover, will look weird |
| 1460 | if we are generating a listing. */ |
| 1461 | if (!had_errors ()) |
| 1462 | { |
| 1463 | alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP); |
| 1464 | if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE) |
| 1465 | && now_seg->entsize) |
| 1466 | { |
| 1467 | unsigned int entsize = now_seg->entsize; |
| 1468 | int entalign = 0; |
| 1469 | |
| 1470 | while ((entsize & 1) == 0) |
| 1471 | { |
| 1472 | ++entalign; |
| 1473 | entsize >>= 1; |
| 1474 | } |
| 1475 | if (entalign > alignment) |
| 1476 | alignment = entalign; |
| 1477 | } |
| 1478 | } |
| 1479 | |
| 1480 | if (subseg_text_p (now_seg)) |
| 1481 | frag_align_code (alignment, 0); |
| 1482 | else |
| 1483 | frag_align (alignment, 0, 0); |
| 1484 | |
| 1485 | /* frag_align will have left a new frag. |
| 1486 | Use this last frag for an empty ".fill". |
| 1487 | |
| 1488 | For this segment ... |
| 1489 | Create a last frag. Do not leave a "being filled in frag". */ |
| 1490 | frag_wane (frag_now); |
| 1491 | frag_now->fr_fix = 0; |
| 1492 | know (frag_now->fr_next == NULL); |
| 1493 | } |
| 1494 | } |
| 1495 | } |
| 1496 | |
| 1497 | /* Write the object file. */ |
| 1498 | |
| 1499 | void |
| 1500 | write_object_file (void) |
| 1501 | { |
| 1502 | struct relax_seg_info rsi; |
| 1503 | #ifndef WORKING_DOT_WORD |
| 1504 | fragS *fragP; /* Track along all frags. */ |
| 1505 | #endif |
| 1506 | |
| 1507 | /* Do we really want to write it? */ |
| 1508 | { |
| 1509 | int n_warns, n_errs; |
| 1510 | n_warns = had_warnings (); |
| 1511 | n_errs = had_errors (); |
| 1512 | /* The -Z flag indicates that an object file should be generated, |
| 1513 | regardless of warnings and errors. */ |
| 1514 | if (flag_always_generate_output) |
| 1515 | { |
| 1516 | if (n_warns || n_errs) |
| 1517 | as_warn (_("%d error%s, %d warning%s, generating bad object file"), |
| 1518 | n_errs, n_errs == 1 ? "" : "s", |
| 1519 | n_warns, n_warns == 1 ? "" : "s"); |
| 1520 | } |
| 1521 | else |
| 1522 | { |
| 1523 | if (n_errs) |
| 1524 | as_fatal (_("%d error%s, %d warning%s, no object file generated"), |
| 1525 | n_errs, n_errs == 1 ? "" : "s", |
| 1526 | n_warns, n_warns == 1 ? "" : "s"); |
| 1527 | } |
| 1528 | } |
| 1529 | |
| 1530 | #ifdef OBJ_VMS |
| 1531 | /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call |
| 1532 | a routine to check for the definition of the procedure "_main", |
| 1533 | and if so -- fix it up so that it can be program entry point. */ |
| 1534 | vms_check_for_main (); |
| 1535 | #endif /* OBJ_VMS */ |
| 1536 | |
| 1537 | /* From now on, we don't care about sub-segments. Build one frag chain |
| 1538 | for each segment. Linked thru fr_next. */ |
| 1539 | |
| 1540 | /* Remove the sections created by gas for its own purposes. */ |
| 1541 | { |
| 1542 | int i; |
| 1543 | |
| 1544 | bfd_section_list_remove (stdoutput, reg_section); |
| 1545 | bfd_section_list_remove (stdoutput, expr_section); |
| 1546 | stdoutput->section_count -= 2; |
| 1547 | i = 0; |
| 1548 | bfd_map_over_sections (stdoutput, renumber_sections, &i); |
| 1549 | } |
| 1550 | |
| 1551 | bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0); |
| 1552 | |
| 1553 | /* We have two segments. If user gave -R flag, then we must put the |
| 1554 | data frags into the text segment. Do this before relaxing so |
| 1555 | we know to take advantage of -R and make shorter addresses. */ |
| 1556 | if (flag_readonly_data_in_text) |
| 1557 | { |
| 1558 | merge_data_into_text (); |
| 1559 | } |
| 1560 | |
| 1561 | rsi.pass = 0; |
| 1562 | while (1) |
| 1563 | { |
| 1564 | #ifndef WORKING_DOT_WORD |
| 1565 | /* We need to reset the markers in the broken word list and |
| 1566 | associated frags between calls to relax_segment (via |
| 1567 | relax_seg). Since the broken word list is global, we do it |
| 1568 | once per round, rather than locally in relax_segment for each |
| 1569 | segment. */ |
| 1570 | struct broken_word *brokp; |
| 1571 | |
| 1572 | for (brokp = broken_words; |
| 1573 | brokp != (struct broken_word *) NULL; |
| 1574 | brokp = brokp->next_broken_word) |
| 1575 | { |
| 1576 | brokp->added = 0; |
| 1577 | |
| 1578 | if (brokp->dispfrag != (fragS *) NULL |
| 1579 | && brokp->dispfrag->fr_type == rs_broken_word) |
| 1580 | brokp->dispfrag->fr_subtype = 0; |
| 1581 | } |
| 1582 | #endif |
| 1583 | |
| 1584 | rsi.changed = 0; |
| 1585 | bfd_map_over_sections (stdoutput, relax_seg, &rsi); |
| 1586 | rsi.pass++; |
| 1587 | if (!rsi.changed) |
| 1588 | break; |
| 1589 | } |
| 1590 | |
| 1591 | /* Note - Most ports will use the default value of |
| 1592 | TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force |
| 1593 | local symbols to be resolved, removing their frag information. |
| 1594 | Some ports however, will not have finished relaxing all of |
| 1595 | their frags and will still need the local symbol frag |
| 1596 | information. These ports can set |
| 1597 | TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */ |
| 1598 | finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG; |
| 1599 | |
| 1600 | bfd_map_over_sections (stdoutput, size_seg, (char *) 0); |
| 1601 | |
| 1602 | /* Relaxation has completed. Freeze all syms. */ |
| 1603 | finalize_syms = 1; |
| 1604 | |
| 1605 | #ifdef md_post_relax_hook |
| 1606 | md_post_relax_hook; |
| 1607 | #endif |
| 1608 | |
| 1609 | #ifndef WORKING_DOT_WORD |
| 1610 | { |
| 1611 | struct broken_word *lie; |
| 1612 | struct broken_word **prevP; |
| 1613 | |
| 1614 | prevP = &broken_words; |
| 1615 | for (lie = broken_words; lie; lie = lie->next_broken_word) |
| 1616 | if (!lie->added) |
| 1617 | { |
| 1618 | expressionS exp; |
| 1619 | |
| 1620 | subseg_change (lie->seg, lie->subseg); |
| 1621 | exp.X_op = O_subtract; |
| 1622 | exp.X_add_symbol = lie->add; |
| 1623 | exp.X_op_symbol = lie->sub; |
| 1624 | exp.X_add_number = lie->addnum; |
| 1625 | #ifdef TC_CONS_FIX_NEW |
| 1626 | TC_CONS_FIX_NEW (lie->frag, |
| 1627 | lie->word_goes_here - lie->frag->fr_literal, |
| 1628 | 2, &exp); |
| 1629 | #else |
| 1630 | fix_new_exp (lie->frag, |
| 1631 | lie->word_goes_here - lie->frag->fr_literal, |
| 1632 | 2, &exp, 0, BFD_RELOC_16); |
| 1633 | #endif |
| 1634 | *prevP = lie->next_broken_word; |
| 1635 | } |
| 1636 | else |
| 1637 | prevP = &(lie->next_broken_word); |
| 1638 | |
| 1639 | for (lie = broken_words; lie;) |
| 1640 | { |
| 1641 | struct broken_word *untruth; |
| 1642 | char *table_ptr; |
| 1643 | addressT table_addr; |
| 1644 | addressT from_addr, to_addr; |
| 1645 | int n, m; |
| 1646 | |
| 1647 | subseg_change (lie->seg, lie->subseg); |
| 1648 | fragP = lie->dispfrag; |
| 1649 | |
| 1650 | /* Find out how many broken_words go here. */ |
| 1651 | n = 0; |
| 1652 | for (untruth = lie; |
| 1653 | untruth && untruth->dispfrag == fragP; |
| 1654 | untruth = untruth->next_broken_word) |
| 1655 | if (untruth->added == 1) |
| 1656 | n++; |
| 1657 | |
| 1658 | table_ptr = lie->dispfrag->fr_opcode; |
| 1659 | table_addr = (lie->dispfrag->fr_address |
| 1660 | + (table_ptr - lie->dispfrag->fr_literal)); |
| 1661 | /* Create the jump around the long jumps. This is a short |
| 1662 | jump from table_ptr+0 to table_ptr+n*long_jump_size. */ |
| 1663 | from_addr = table_addr; |
| 1664 | to_addr = table_addr + md_short_jump_size + n * md_long_jump_size; |
| 1665 | md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag, |
| 1666 | lie->add); |
| 1667 | table_ptr += md_short_jump_size; |
| 1668 | table_addr += md_short_jump_size; |
| 1669 | |
| 1670 | for (m = 0; |
| 1671 | lie && lie->dispfrag == fragP; |
| 1672 | m++, lie = lie->next_broken_word) |
| 1673 | { |
| 1674 | if (lie->added == 2) |
| 1675 | continue; |
| 1676 | /* Patch the jump table. */ |
| 1677 | for (untruth = (struct broken_word *) (fragP->fr_symbol); |
| 1678 | untruth && untruth->dispfrag == fragP; |
| 1679 | untruth = untruth->next_broken_word) |
| 1680 | { |
| 1681 | if (untruth->use_jump == lie) |
| 1682 | { |
| 1683 | /* This is the offset from ??? to table_ptr+0. |
| 1684 | The target is the same for all users of this |
| 1685 | md_long_jump, but the "sub" bases (and hence the |
| 1686 | offsets) may be different. */ |
| 1687 | addressT to_word = table_addr - S_GET_VALUE (untruth->sub); |
| 1688 | #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD |
| 1689 | TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_word, untruth); |
| 1690 | #endif |
| 1691 | md_number_to_chars (untruth->word_goes_here, to_word, 2); |
| 1692 | } |
| 1693 | } |
| 1694 | |
| 1695 | /* Install the long jump. */ |
| 1696 | /* This is a long jump from table_ptr+0 to the final target. */ |
| 1697 | from_addr = table_addr; |
| 1698 | to_addr = S_GET_VALUE (lie->add) + lie->addnum; |
| 1699 | md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag, |
| 1700 | lie->add); |
| 1701 | table_ptr += md_long_jump_size; |
| 1702 | table_addr += md_long_jump_size; |
| 1703 | } |
| 1704 | } |
| 1705 | } |
| 1706 | #endif /* not WORKING_DOT_WORD */ |
| 1707 | |
| 1708 | /* Resolve symbol values. This needs to be done before processing |
| 1709 | the relocations. */ |
| 1710 | if (symbol_rootP) |
| 1711 | { |
| 1712 | symbolS *symp; |
| 1713 | |
| 1714 | for (symp = symbol_rootP; symp; symp = symbol_next (symp)) |
| 1715 | resolve_symbol_value (symp); |
| 1716 | } |
| 1717 | resolve_local_symbol_values (); |
| 1718 | resolve_reloc_expr_symbols (); |
| 1719 | |
| 1720 | PROGRESS (1); |
| 1721 | |
| 1722 | #ifdef tc_frob_file_before_adjust |
| 1723 | tc_frob_file_before_adjust (); |
| 1724 | #endif |
| 1725 | #ifdef obj_frob_file_before_adjust |
| 1726 | obj_frob_file_before_adjust (); |
| 1727 | #endif |
| 1728 | |
| 1729 | bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0); |
| 1730 | |
| 1731 | #ifdef tc_frob_file_before_fix |
| 1732 | tc_frob_file_before_fix (); |
| 1733 | #endif |
| 1734 | #ifdef obj_frob_file_before_fix |
| 1735 | obj_frob_file_before_fix (); |
| 1736 | #endif |
| 1737 | |
| 1738 | bfd_map_over_sections (stdoutput, fix_segment, (char *) 0); |
| 1739 | |
| 1740 | /* Set up symbol table, and write it out. */ |
| 1741 | if (symbol_rootP) |
| 1742 | { |
| 1743 | symbolS *symp; |
| 1744 | bfd_boolean skip_next_symbol = FALSE; |
| 1745 | |
| 1746 | for (symp = symbol_rootP; symp; symp = symbol_next (symp)) |
| 1747 | { |
| 1748 | int punt = 0; |
| 1749 | const char *name; |
| 1750 | |
| 1751 | if (skip_next_symbol) |
| 1752 | { |
| 1753 | /* Don't do anything besides moving the value of the |
| 1754 | symbol from the GAS value-field to the BFD value-field. */ |
| 1755 | symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp); |
| 1756 | skip_next_symbol = FALSE; |
| 1757 | continue; |
| 1758 | } |
| 1759 | |
| 1760 | if (symbol_mri_common_p (symp)) |
| 1761 | { |
| 1762 | if (S_IS_EXTERNAL (symp)) |
| 1763 | as_bad (_("%s: global symbols not supported in common sections"), |
| 1764 | S_GET_NAME (symp)); |
| 1765 | symbol_remove (symp, &symbol_rootP, &symbol_lastP); |
| 1766 | continue; |
| 1767 | } |
| 1768 | |
| 1769 | name = S_GET_NAME (symp); |
| 1770 | if (name) |
| 1771 | { |
| 1772 | const char *name2 = |
| 1773 | decode_local_label_name ((char *) S_GET_NAME (symp)); |
| 1774 | /* They only differ if `name' is a fb or dollar local |
| 1775 | label name. */ |
| 1776 | if (name2 != name && ! S_IS_DEFINED (symp)) |
| 1777 | as_bad (_("local label `%s' is not defined"), name2); |
| 1778 | } |
| 1779 | |
| 1780 | /* Do it again, because adjust_reloc_syms might introduce |
| 1781 | more symbols. They'll probably only be section symbols, |
| 1782 | but they'll still need to have the values computed. */ |
| 1783 | resolve_symbol_value (symp); |
| 1784 | |
| 1785 | /* Skip symbols which were equated to undefined or common |
| 1786 | symbols. */ |
| 1787 | if (symbol_equated_reloc_p (symp) |
| 1788 | || S_IS_WEAKREFR (symp)) |
| 1789 | { |
| 1790 | const char *name = S_GET_NAME (symp); |
| 1791 | if (S_IS_COMMON (symp) |
| 1792 | && !TC_FAKE_LABEL (name) |
| 1793 | && !S_IS_WEAKREFR (symp) |
| 1794 | && (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp))) |
| 1795 | { |
| 1796 | expressionS *e = symbol_get_value_expression (symp); |
| 1797 | as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"), |
| 1798 | name, S_GET_NAME (e->X_add_symbol)); |
| 1799 | } |
| 1800 | if (S_GET_SEGMENT (symp) == reg_section) |
| 1801 | { |
| 1802 | /* Report error only if we know the symbol name. */ |
| 1803 | if (S_GET_NAME (symp) != reg_section->name) |
| 1804 | as_bad (_("can't make global register symbol `%s'"), |
| 1805 | name); |
| 1806 | } |
| 1807 | symbol_remove (symp, &symbol_rootP, &symbol_lastP); |
| 1808 | continue; |
| 1809 | } |
| 1810 | |
| 1811 | #ifdef obj_frob_symbol |
| 1812 | obj_frob_symbol (symp, punt); |
| 1813 | #endif |
| 1814 | #ifdef tc_frob_symbol |
| 1815 | if (! punt || symbol_used_in_reloc_p (symp)) |
| 1816 | tc_frob_symbol (symp, punt); |
| 1817 | #endif |
| 1818 | |
| 1819 | /* If we don't want to keep this symbol, splice it out of |
| 1820 | the chain now. If EMIT_SECTION_SYMBOLS is 0, we never |
| 1821 | want section symbols. Otherwise, we skip local symbols |
| 1822 | and symbols that the frob_symbol macros told us to punt, |
| 1823 | but we keep such symbols if they are used in relocs. */ |
| 1824 | if (symp == abs_section_sym |
| 1825 | || (! EMIT_SECTION_SYMBOLS |
| 1826 | && symbol_section_p (symp)) |
| 1827 | /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always |
| 1828 | opposites. Sometimes the former checks flags and the |
| 1829 | latter examines the name... */ |
| 1830 | || (!S_IS_EXTERNAL (symp) |
| 1831 | && (punt || S_IS_LOCAL (symp) || |
| 1832 | (S_IS_WEAKREFD (symp) && ! symbol_used_p (symp))) |
| 1833 | && ! symbol_used_in_reloc_p (symp))) |
| 1834 | { |
| 1835 | symbol_remove (symp, &symbol_rootP, &symbol_lastP); |
| 1836 | |
| 1837 | /* After symbol_remove, symbol_next(symp) still returns |
| 1838 | the one that came after it in the chain. So we don't |
| 1839 | need to do any extra cleanup work here. */ |
| 1840 | continue; |
| 1841 | } |
| 1842 | |
| 1843 | /* Make sure we really got a value for the symbol. */ |
| 1844 | if (! symbol_resolved_p (symp)) |
| 1845 | { |
| 1846 | as_bad (_("can't resolve value for symbol `%s'"), |
| 1847 | S_GET_NAME (symp)); |
| 1848 | symbol_mark_resolved (symp); |
| 1849 | } |
| 1850 | |
| 1851 | /* Set the value into the BFD symbol. Up til now the value |
| 1852 | has only been kept in the gas symbolS struct. */ |
| 1853 | symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp); |
| 1854 | |
| 1855 | /* A warning construct is a warning symbol followed by the |
| 1856 | symbol warned about. Don't let anything object-format or |
| 1857 | target-specific muck with it; it's ready for output. */ |
| 1858 | if (symbol_get_bfdsym (symp)->flags & BSF_WARNING) |
| 1859 | skip_next_symbol = TRUE; |
| 1860 | } |
| 1861 | } |
| 1862 | |
| 1863 | PROGRESS (1); |
| 1864 | |
| 1865 | /* Now do any format-specific adjustments to the symbol table, such |
| 1866 | as adding file symbols. */ |
| 1867 | #ifdef tc_adjust_symtab |
| 1868 | tc_adjust_symtab (); |
| 1869 | #endif |
| 1870 | #ifdef obj_adjust_symtab |
| 1871 | obj_adjust_symtab (); |
| 1872 | #endif |
| 1873 | |
| 1874 | /* Stop if there is an error. */ |
| 1875 | if (had_errors ()) |
| 1876 | return; |
| 1877 | |
| 1878 | /* Now that all the sizes are known, and contents correct, we can |
| 1879 | start writing to the file. */ |
| 1880 | set_symtab (); |
| 1881 | |
| 1882 | /* If *_frob_file changes the symbol value at this point, it is |
| 1883 | responsible for moving the changed value into symp->bsym->value |
| 1884 | as well. Hopefully all symbol value changing can be done in |
| 1885 | *_frob_symbol. */ |
| 1886 | #ifdef tc_frob_file |
| 1887 | tc_frob_file (); |
| 1888 | #endif |
| 1889 | #ifdef obj_frob_file |
| 1890 | obj_frob_file (); |
| 1891 | #endif |
| 1892 | #ifdef obj_coff_generate_pdata |
| 1893 | obj_coff_generate_pdata (); |
| 1894 | #endif |
| 1895 | bfd_map_over_sections (stdoutput, write_relocs, (char *) 0); |
| 1896 | |
| 1897 | #ifdef tc_frob_file_after_relocs |
| 1898 | tc_frob_file_after_relocs (); |
| 1899 | #endif |
| 1900 | #ifdef obj_frob_file_after_relocs |
| 1901 | obj_frob_file_after_relocs (); |
| 1902 | #endif |
| 1903 | |
| 1904 | bfd_map_over_sections (stdoutput, write_contents, (char *) 0); |
| 1905 | } |
| 1906 | |
| 1907 | #ifdef TC_GENERIC_RELAX_TABLE |
| 1908 | /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */ |
| 1909 | |
| 1910 | long |
| 1911 | relax_frag (segT segment, fragS *fragP, long stretch) |
| 1912 | { |
| 1913 | const relax_typeS *this_type; |
| 1914 | const relax_typeS *start_type; |
| 1915 | relax_substateT next_state; |
| 1916 | relax_substateT this_state; |
| 1917 | offsetT growth; |
| 1918 | offsetT aim; |
| 1919 | addressT target; |
| 1920 | addressT address; |
| 1921 | symbolS *symbolP; |
| 1922 | const relax_typeS *table; |
| 1923 | |
| 1924 | target = fragP->fr_offset; |
| 1925 | address = fragP->fr_address; |
| 1926 | table = TC_GENERIC_RELAX_TABLE; |
| 1927 | this_state = fragP->fr_subtype; |
| 1928 | start_type = this_type = table + this_state; |
| 1929 | symbolP = fragP->fr_symbol; |
| 1930 | |
| 1931 | if (symbolP) |
| 1932 | { |
| 1933 | fragS *sym_frag; |
| 1934 | |
| 1935 | sym_frag = symbol_get_frag (symbolP); |
| 1936 | |
| 1937 | #ifndef DIFF_EXPR_OK |
| 1938 | know (sym_frag != NULL); |
| 1939 | #endif |
| 1940 | know (S_GET_SEGMENT (symbolP) != absolute_section |
| 1941 | || sym_frag == &zero_address_frag); |
| 1942 | target += S_GET_VALUE (symbolP); |
| 1943 | |
| 1944 | /* If frag has yet to be reached on this pass, |
| 1945 | assume it will move by STRETCH just as we did. |
| 1946 | If this is not so, it will be because some frag |
| 1947 | between grows, and that will force another pass. */ |
| 1948 | |
| 1949 | if (stretch != 0 |
| 1950 | && sym_frag->relax_marker != fragP->relax_marker |
| 1951 | && S_GET_SEGMENT (symbolP) == segment) |
| 1952 | { |
| 1953 | target += stretch; |
| 1954 | } |
| 1955 | } |
| 1956 | |
| 1957 | aim = target - address - fragP->fr_fix; |
| 1958 | #ifdef TC_PCREL_ADJUST |
| 1959 | /* Currently only the ns32k family needs this. */ |
| 1960 | aim += TC_PCREL_ADJUST (fragP); |
| 1961 | #endif |
| 1962 | |
| 1963 | #ifdef md_prepare_relax_scan |
| 1964 | /* Formerly called M68K_AIM_KLUDGE. */ |
| 1965 | md_prepare_relax_scan (fragP, address, aim, this_state, this_type); |
| 1966 | #endif |
| 1967 | |
| 1968 | if (aim < 0) |
| 1969 | { |
| 1970 | /* Look backwards. */ |
| 1971 | for (next_state = this_type->rlx_more; next_state;) |
| 1972 | if (aim >= this_type->rlx_backward) |
| 1973 | next_state = 0; |
| 1974 | else |
| 1975 | { |
| 1976 | /* Grow to next state. */ |
| 1977 | this_state = next_state; |
| 1978 | this_type = table + this_state; |
| 1979 | next_state = this_type->rlx_more; |
| 1980 | } |
| 1981 | } |
| 1982 | else |
| 1983 | { |
| 1984 | /* Look forwards. */ |
| 1985 | for (next_state = this_type->rlx_more; next_state;) |
| 1986 | if (aim <= this_type->rlx_forward) |
| 1987 | next_state = 0; |
| 1988 | else |
| 1989 | { |
| 1990 | /* Grow to next state. */ |
| 1991 | this_state = next_state; |
| 1992 | this_type = table + this_state; |
| 1993 | next_state = this_type->rlx_more; |
| 1994 | } |
| 1995 | } |
| 1996 | |
| 1997 | growth = this_type->rlx_length - start_type->rlx_length; |
| 1998 | if (growth != 0) |
| 1999 | fragP->fr_subtype = this_state; |
| 2000 | return growth; |
| 2001 | } |
| 2002 | |
| 2003 | #endif /* defined (TC_GENERIC_RELAX_TABLE) */ |
| 2004 | |
| 2005 | /* Relax_align. Advance location counter to next address that has 'alignment' |
| 2006 | lowest order bits all 0s, return size of adjustment made. */ |
| 2007 | static relax_addressT |
| 2008 | relax_align (register relax_addressT address, /* Address now. */ |
| 2009 | register int alignment /* Alignment (binary). */) |
| 2010 | { |
| 2011 | relax_addressT mask; |
| 2012 | relax_addressT new_address; |
| 2013 | |
| 2014 | mask = ~((~0) << alignment); |
| 2015 | new_address = (address + mask) & (~mask); |
| 2016 | #ifdef LINKER_RELAXING_SHRINKS_ONLY |
| 2017 | if (linkrelax) |
| 2018 | /* We must provide lots of padding, so the linker can discard it |
| 2019 | when needed. The linker will not add extra space, ever. */ |
| 2020 | new_address += (1 << alignment); |
| 2021 | #endif |
| 2022 | return (new_address - address); |
| 2023 | } |
| 2024 | |
| 2025 | /* Now we have a segment, not a crowd of sub-segments, we can make |
| 2026 | fr_address values. |
| 2027 | |
| 2028 | Relax the frags. |
| 2029 | |
| 2030 | After this, all frags in this segment have addresses that are correct |
| 2031 | within the segment. Since segments live in different file addresses, |
| 2032 | these frag addresses may not be the same as final object-file |
| 2033 | addresses. */ |
| 2034 | |
| 2035 | int |
| 2036 | relax_segment (struct frag *segment_frag_root, segT segment, int pass) |
| 2037 | { |
| 2038 | unsigned long frag_count; |
| 2039 | struct frag *fragP; |
| 2040 | relax_addressT address; |
| 2041 | int ret; |
| 2042 | |
| 2043 | /* In case md_estimate_size_before_relax() wants to make fixSs. */ |
| 2044 | subseg_change (segment, 0); |
| 2045 | |
| 2046 | /* For each frag in segment: count and store (a 1st guess of) |
| 2047 | fr_address. */ |
| 2048 | address = 0; |
| 2049 | for (frag_count = 0, fragP = segment_frag_root; |
| 2050 | fragP; |
| 2051 | fragP = fragP->fr_next, frag_count ++) |
| 2052 | { |
| 2053 | fragP->relax_marker = 0; |
| 2054 | fragP->fr_address = address; |
| 2055 | address += fragP->fr_fix; |
| 2056 | |
| 2057 | switch (fragP->fr_type) |
| 2058 | { |
| 2059 | case rs_fill: |
| 2060 | address += fragP->fr_offset * fragP->fr_var; |
| 2061 | break; |
| 2062 | |
| 2063 | case rs_align: |
| 2064 | case rs_align_code: |
| 2065 | case rs_align_test: |
| 2066 | { |
| 2067 | addressT offset = relax_align (address, (int) fragP->fr_offset); |
| 2068 | |
| 2069 | if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype) |
| 2070 | offset = 0; |
| 2071 | |
| 2072 | if (offset % fragP->fr_var != 0) |
| 2073 | { |
| 2074 | as_bad_where (fragP->fr_file, fragP->fr_line, |
| 2075 | _("alignment padding (%lu bytes) not a multiple of %ld"), |
| 2076 | (unsigned long) offset, (long) fragP->fr_var); |
| 2077 | offset -= (offset % fragP->fr_var); |
| 2078 | } |
| 2079 | |
| 2080 | address += offset; |
| 2081 | } |
| 2082 | break; |
| 2083 | |
| 2084 | case rs_org: |
| 2085 | case rs_space: |
| 2086 | /* Assume .org is nugatory. It will grow with 1st relax. */ |
| 2087 | break; |
| 2088 | |
| 2089 | case rs_machine_dependent: |
| 2090 | /* If fr_symbol is an expression, this call to |
| 2091 | resolve_symbol_value sets up the correct segment, which will |
| 2092 | likely be needed in md_estimate_size_before_relax. */ |
| 2093 | if (fragP->fr_symbol) |
| 2094 | resolve_symbol_value (fragP->fr_symbol); |
| 2095 | |
| 2096 | address += md_estimate_size_before_relax (fragP, segment); |
| 2097 | break; |
| 2098 | |
| 2099 | #ifndef WORKING_DOT_WORD |
| 2100 | /* Broken words don't concern us yet. */ |
| 2101 | case rs_broken_word: |
| 2102 | break; |
| 2103 | #endif |
| 2104 | |
| 2105 | case rs_leb128: |
| 2106 | /* Initial guess is always 1; doing otherwise can result in |
| 2107 | stable solutions that are larger than the minimum. */ |
| 2108 | address += fragP->fr_offset = 1; |
| 2109 | break; |
| 2110 | |
| 2111 | case rs_cfa: |
| 2112 | address += eh_frame_estimate_size_before_relax (fragP); |
| 2113 | break; |
| 2114 | |
| 2115 | case rs_dwarf2dbg: |
| 2116 | address += dwarf2dbg_estimate_size_before_relax (fragP); |
| 2117 | break; |
| 2118 | |
| 2119 | default: |
| 2120 | BAD_CASE (fragP->fr_type); |
| 2121 | break; |
| 2122 | } |
| 2123 | } |
| 2124 | |
| 2125 | /* Do relax(). */ |
| 2126 | { |
| 2127 | unsigned long max_iterations; |
| 2128 | |
| 2129 | /* Cumulative address adjustment. */ |
| 2130 | offsetT stretch; |
| 2131 | |
| 2132 | /* Have we made any adjustment this pass? We can't just test |
| 2133 | stretch because one piece of code may have grown and another |
| 2134 | shrank. */ |
| 2135 | int stretched; |
| 2136 | |
| 2137 | /* Most horrible, but gcc may give us some exception data that |
| 2138 | is impossible to assemble, of the form |
| 2139 | |
| 2140 | .align 4 |
| 2141 | .byte 0, 0 |
| 2142 | .uleb128 end - start |
| 2143 | start: |
| 2144 | .space 128*128 - 1 |
| 2145 | .align 4 |
| 2146 | end: |
| 2147 | |
| 2148 | If the leb128 is two bytes in size, then end-start is 128*128, |
| 2149 | which requires a three byte leb128. If the leb128 is three |
| 2150 | bytes in size, then end-start is 128*128-1, which requires a |
| 2151 | two byte leb128. We work around this dilemma by inserting |
| 2152 | an extra 4 bytes of alignment just after the .align. This |
| 2153 | works because the data after the align is accessed relative to |
| 2154 | the end label. |
| 2155 | |
| 2156 | This counter is used in a tiny state machine to detect |
| 2157 | whether a leb128 followed by an align is impossible to |
| 2158 | relax. */ |
| 2159 | int rs_leb128_fudge = 0; |
| 2160 | |
| 2161 | /* We want to prevent going into an infinite loop where one frag grows |
| 2162 | depending upon the location of a symbol which is in turn moved by |
| 2163 | the growing frag. eg: |
| 2164 | |
| 2165 | foo = . |
| 2166 | .org foo+16 |
| 2167 | foo = . |
| 2168 | |
| 2169 | So we dictate that this algorithm can be at most O2. */ |
| 2170 | max_iterations = frag_count * frag_count; |
| 2171 | /* Check for overflow. */ |
| 2172 | if (max_iterations < frag_count) |
| 2173 | max_iterations = frag_count; |
| 2174 | |
| 2175 | ret = 0; |
| 2176 | do |
| 2177 | { |
| 2178 | stretch = 0; |
| 2179 | stretched = 0; |
| 2180 | |
| 2181 | for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next) |
| 2182 | { |
| 2183 | offsetT growth = 0; |
| 2184 | addressT was_address; |
| 2185 | offsetT offset; |
| 2186 | symbolS *symbolP; |
| 2187 | |
| 2188 | fragP->relax_marker ^= 1; |
| 2189 | was_address = fragP->fr_address; |
| 2190 | address = fragP->fr_address += stretch; |
| 2191 | symbolP = fragP->fr_symbol; |
| 2192 | offset = fragP->fr_offset; |
| 2193 | |
| 2194 | switch (fragP->fr_type) |
| 2195 | { |
| 2196 | case rs_fill: /* .fill never relaxes. */ |
| 2197 | growth = 0; |
| 2198 | break; |
| 2199 | |
| 2200 | #ifndef WORKING_DOT_WORD |
| 2201 | /* JF: This is RMS's idea. I do *NOT* want to be blamed |
| 2202 | for it I do not want to write it. I do not want to have |
| 2203 | anything to do with it. This is not the proper way to |
| 2204 | implement this misfeature. */ |
| 2205 | case rs_broken_word: |
| 2206 | { |
| 2207 | struct broken_word *lie; |
| 2208 | struct broken_word *untruth; |
| 2209 | |
| 2210 | /* Yes this is ugly (storing the broken_word pointer |
| 2211 | in the symbol slot). Still, this whole chunk of |
| 2212 | code is ugly, and I don't feel like doing anything |
| 2213 | about it. Think of it as stubbornness in action. */ |
| 2214 | growth = 0; |
| 2215 | for (lie = (struct broken_word *) (fragP->fr_symbol); |
| 2216 | lie && lie->dispfrag == fragP; |
| 2217 | lie = lie->next_broken_word) |
| 2218 | { |
| 2219 | |
| 2220 | if (lie->added) |
| 2221 | continue; |
| 2222 | |
| 2223 | offset = (S_GET_VALUE (lie->add) |
| 2224 | + lie->addnum |
| 2225 | - S_GET_VALUE (lie->sub)); |
| 2226 | if (offset <= -32768 || offset >= 32767) |
| 2227 | { |
| 2228 | if (flag_warn_displacement) |
| 2229 | { |
| 2230 | char buf[50]; |
| 2231 | sprint_value (buf, (addressT) lie->addnum); |
| 2232 | as_warn_where (fragP->fr_file, fragP->fr_line, |
| 2233 | _(".word %s-%s+%s didn't fit"), |
| 2234 | S_GET_NAME (lie->add), |
| 2235 | S_GET_NAME (lie->sub), |
| 2236 | buf); |
| 2237 | } |
| 2238 | if (fragP->fr_subtype == 0) |
| 2239 | { |
| 2240 | fragP->fr_subtype++; |
| 2241 | growth += md_short_jump_size; |
| 2242 | } |
| 2243 | |
| 2244 | /* Redirect *all* words of this table with the same |
| 2245 | target, lest we have to handle the case where the |
| 2246 | same target but with a offset that fits on this |
| 2247 | round overflows at the next relaxation round. */ |
| 2248 | for (untruth = (struct broken_word *) (fragP->fr_symbol); |
| 2249 | untruth && untruth->dispfrag == lie->dispfrag; |
| 2250 | untruth = untruth->next_broken_word) |
| 2251 | if ((symbol_get_frag (untruth->add) |
| 2252 | == symbol_get_frag (lie->add)) |
| 2253 | && (S_GET_VALUE (untruth->add) |
| 2254 | == S_GET_VALUE (lie->add))) |
| 2255 | { |
| 2256 | untruth->added = 2; |
| 2257 | untruth->use_jump = lie; |
| 2258 | } |
| 2259 | |
| 2260 | lie->added = 1; |
| 2261 | growth += md_long_jump_size; |
| 2262 | } |
| 2263 | } |
| 2264 | |
| 2265 | break; |
| 2266 | } /* case rs_broken_word */ |
| 2267 | #endif |
| 2268 | case rs_align: |
| 2269 | case rs_align_code: |
| 2270 | case rs_align_test: |
| 2271 | { |
| 2272 | addressT oldoff, newoff; |
| 2273 | |
| 2274 | oldoff = relax_align (was_address + fragP->fr_fix, |
| 2275 | (int) offset); |
| 2276 | newoff = relax_align (address + fragP->fr_fix, |
| 2277 | (int) offset); |
| 2278 | |
| 2279 | if (fragP->fr_subtype != 0) |
| 2280 | { |
| 2281 | if (oldoff > fragP->fr_subtype) |
| 2282 | oldoff = 0; |
| 2283 | if (newoff > fragP->fr_subtype) |
| 2284 | newoff = 0; |
| 2285 | } |
| 2286 | |
| 2287 | growth = newoff - oldoff; |
| 2288 | |
| 2289 | /* If this align happens to follow a leb128 and |
| 2290 | we have determined that the leb128 is bouncing |
| 2291 | in size, then break the cycle by inserting an |
| 2292 | extra alignment. */ |
| 2293 | if (growth < 0 |
| 2294 | && (rs_leb128_fudge & 16) != 0 |
| 2295 | && (rs_leb128_fudge & 15) >= 2) |
| 2296 | { |
| 2297 | segment_info_type *seginfo = seg_info (segment); |
| 2298 | struct obstack *ob = &seginfo->frchainP->frch_obstack; |
| 2299 | struct frag *newf; |
| 2300 | |
| 2301 | newf = frag_alloc (ob); |
| 2302 | obstack_blank_fast (ob, fragP->fr_var); |
| 2303 | obstack_finish (ob); |
| 2304 | memcpy (newf, fragP, SIZEOF_STRUCT_FRAG); |
| 2305 | memcpy (newf->fr_literal, |
| 2306 | fragP->fr_literal + fragP->fr_fix, |
| 2307 | fragP->fr_var); |
| 2308 | newf->fr_type = rs_fill; |
| 2309 | newf->fr_fix = 0; |
| 2310 | newf->fr_offset = (((offsetT) 1 << fragP->fr_offset) |
| 2311 | / fragP->fr_var); |
| 2312 | if (newf->fr_offset * newf->fr_var |
| 2313 | != (offsetT) 1 << fragP->fr_offset) |
| 2314 | { |
| 2315 | newf->fr_offset = (offsetT) 1 << fragP->fr_offset; |
| 2316 | newf->fr_var = 1; |
| 2317 | } |
| 2318 | /* Include growth of new frag, because rs_fill |
| 2319 | frags don't normally grow. */ |
| 2320 | growth += newf->fr_offset * newf->fr_var; |
| 2321 | /* The new frag address is newoff. Adjust this |
| 2322 | for the amount we'll add when we process the |
| 2323 | new frag. */ |
| 2324 | newf->fr_address = newoff - stretch - growth; |
| 2325 | newf->relax_marker ^= 1; |
| 2326 | fragP->fr_next = newf; |
| 2327 | #ifdef DEBUG |
| 2328 | as_warn (_("padding added")); |
| 2329 | #endif |
| 2330 | } |
| 2331 | } |
| 2332 | break; |
| 2333 | |
| 2334 | case rs_org: |
| 2335 | { |
| 2336 | addressT target = offset; |
| 2337 | addressT after; |
| 2338 | |
| 2339 | if (symbolP) |
| 2340 | { |
| 2341 | /* Convert from an actual address to an octet offset |
| 2342 | into the section. Here it is assumed that the |
| 2343 | section's VMA is zero, and can omit subtracting it |
| 2344 | from the symbol's value to get the address offset. */ |
| 2345 | know (S_GET_SEGMENT (symbolP)->vma == 0); |
| 2346 | target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE; |
| 2347 | } |
| 2348 | |
| 2349 | know (fragP->fr_next); |
| 2350 | after = fragP->fr_next->fr_address + stretch; |
| 2351 | growth = target - after; |
| 2352 | if (growth < 0) |
| 2353 | { |
| 2354 | growth = 0; |
| 2355 | |
| 2356 | /* Don't error on first few frag relax passes. |
| 2357 | The symbol might be an expression involving |
| 2358 | symbol values from other sections. If those |
| 2359 | sections have not yet been processed their |
| 2360 | frags will all have zero addresses, so we |
| 2361 | will calculate incorrect values for them. The |
| 2362 | number of passes we allow before giving an |
| 2363 | error is somewhat arbitrary. It should be at |
| 2364 | least one, with larger values requiring |
| 2365 | increasingly contrived dependencies between |
| 2366 | frags to trigger a false error. */ |
| 2367 | if (pass < 2) |
| 2368 | { |
| 2369 | /* Force another pass. */ |
| 2370 | ret = 1; |
| 2371 | break; |
| 2372 | } |
| 2373 | |
| 2374 | /* Growth may be negative, but variable part of frag |
| 2375 | cannot have fewer than 0 chars. That is, we can't |
| 2376 | .org backwards. */ |
| 2377 | as_bad_where (fragP->fr_file, fragP->fr_line, |
| 2378 | _("attempt to move .org backwards")); |
| 2379 | |
| 2380 | /* We've issued an error message. Change the |
| 2381 | frag to avoid cascading errors. */ |
| 2382 | fragP->fr_type = rs_align; |
| 2383 | fragP->fr_subtype = 0; |
| 2384 | fragP->fr_offset = 0; |
| 2385 | fragP->fr_fix = after - address; |
| 2386 | } |
| 2387 | } |
| 2388 | break; |
| 2389 | |
| 2390 | case rs_space: |
| 2391 | growth = 0; |
| 2392 | if (symbolP) |
| 2393 | { |
| 2394 | offsetT amount; |
| 2395 | |
| 2396 | amount = S_GET_VALUE (symbolP); |
| 2397 | if (S_GET_SEGMENT (symbolP) != absolute_section |
| 2398 | || S_IS_COMMON (symbolP) |
| 2399 | || ! S_IS_DEFINED (symbolP)) |
| 2400 | { |
| 2401 | as_bad_where (fragP->fr_file, fragP->fr_line, |
| 2402 | _(".space specifies non-absolute value")); |
| 2403 | /* Prevent repeat of this error message. */ |
| 2404 | fragP->fr_symbol = 0; |
| 2405 | } |
| 2406 | else if (amount < 0) |
| 2407 | { |
| 2408 | /* Don't error on first few frag relax passes. |
| 2409 | See rs_org comment for a longer explanation. */ |
| 2410 | if (pass < 2) |
| 2411 | { |
| 2412 | ret = 1; |
| 2413 | break; |
| 2414 | } |
| 2415 | |
| 2416 | as_warn_where (fragP->fr_file, fragP->fr_line, |
| 2417 | _(".space or .fill with negative value, ignored")); |
| 2418 | fragP->fr_symbol = 0; |
| 2419 | } |
| 2420 | else |
| 2421 | growth = (was_address + fragP->fr_fix + amount |
| 2422 | - fragP->fr_next->fr_address); |
| 2423 | } |
| 2424 | break; |
| 2425 | |
| 2426 | case rs_machine_dependent: |
| 2427 | #ifdef md_relax_frag |
| 2428 | growth = md_relax_frag (segment, fragP, stretch); |
| 2429 | #else |
| 2430 | #ifdef TC_GENERIC_RELAX_TABLE |
| 2431 | /* The default way to relax a frag is to look through |
| 2432 | TC_GENERIC_RELAX_TABLE. */ |
| 2433 | growth = relax_frag (segment, fragP, stretch); |
| 2434 | #endif /* TC_GENERIC_RELAX_TABLE */ |
| 2435 | #endif |
| 2436 | break; |
| 2437 | |
| 2438 | case rs_leb128: |
| 2439 | { |
| 2440 | valueT value; |
| 2441 | offsetT size; |
| 2442 | |
| 2443 | value = resolve_symbol_value (fragP->fr_symbol); |
| 2444 | size = sizeof_leb128 (value, fragP->fr_subtype); |
| 2445 | growth = size - fragP->fr_offset; |
| 2446 | fragP->fr_offset = size; |
| 2447 | } |
| 2448 | break; |
| 2449 | |
| 2450 | case rs_cfa: |
| 2451 | growth = eh_frame_relax_frag (fragP); |
| 2452 | break; |
| 2453 | |
| 2454 | case rs_dwarf2dbg: |
| 2455 | growth = dwarf2dbg_relax_frag (fragP); |
| 2456 | break; |
| 2457 | |
| 2458 | default: |
| 2459 | BAD_CASE (fragP->fr_type); |
| 2460 | break; |
| 2461 | } |
| 2462 | if (growth) |
| 2463 | { |
| 2464 | stretch += growth; |
| 2465 | stretched = 1; |
| 2466 | if (fragP->fr_type == rs_leb128) |
| 2467 | rs_leb128_fudge += 16; |
| 2468 | else if (fragP->fr_type == rs_align |
| 2469 | && (rs_leb128_fudge & 16) != 0 |
| 2470 | && stretch == 0) |
| 2471 | rs_leb128_fudge += 16; |
| 2472 | else |
| 2473 | rs_leb128_fudge = 0; |
| 2474 | } |
| 2475 | } |
| 2476 | |
| 2477 | if (stretch == 0 |
| 2478 | && (rs_leb128_fudge & 16) == 0 |
| 2479 | && (rs_leb128_fudge & -16) != 0) |
| 2480 | rs_leb128_fudge += 1; |
| 2481 | else |
| 2482 | rs_leb128_fudge = 0; |
| 2483 | } |
| 2484 | /* Until nothing further to relax. */ |
| 2485 | while (stretched && -- max_iterations); |
| 2486 | |
| 2487 | if (stretched) |
| 2488 | as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"), |
| 2489 | segment_name (segment)); |
| 2490 | } |
| 2491 | |
| 2492 | for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next) |
| 2493 | if (fragP->last_fr_address != fragP->fr_address) |
| 2494 | { |
| 2495 | fragP->last_fr_address = fragP->fr_address; |
| 2496 | ret = 1; |
| 2497 | } |
| 2498 | return ret; |
| 2499 | } |
| 2500 | |
| 2501 | void |
| 2502 | number_to_chars_bigendian (char *buf, valueT val, int n) |
| 2503 | { |
| 2504 | if (n <= 0) |
| 2505 | abort (); |
| 2506 | while (n--) |
| 2507 | { |
| 2508 | buf[n] = val & 0xff; |
| 2509 | val >>= 8; |
| 2510 | } |
| 2511 | } |
| 2512 | |
| 2513 | void |
| 2514 | number_to_chars_littleendian (char *buf, valueT val, int n) |
| 2515 | { |
| 2516 | if (n <= 0) |
| 2517 | abort (); |
| 2518 | while (n--) |
| 2519 | { |
| 2520 | *buf++ = val & 0xff; |
| 2521 | val >>= 8; |
| 2522 | } |
| 2523 | } |
| 2524 | |
| 2525 | void |
| 2526 | write_print_statistics (FILE *file) |
| 2527 | { |
| 2528 | fprintf (file, "fixups: %d\n", n_fixups); |
| 2529 | } |
| 2530 | |
| 2531 | /* For debugging. */ |
| 2532 | extern int indent_level; |
| 2533 | |
| 2534 | void |
| 2535 | print_fixup (fixS *fixp) |
| 2536 | { |
| 2537 | indent_level = 1; |
| 2538 | fprintf (stderr, "fix "); |
| 2539 | fprintf_vma (stderr, (bfd_vma)((bfd_hostptr_t) fixp)); |
| 2540 | fprintf (stderr, " %s:%d",fixp->fx_file, fixp->fx_line); |
| 2541 | if (fixp->fx_pcrel) |
| 2542 | fprintf (stderr, " pcrel"); |
| 2543 | if (fixp->fx_pcrel_adjust) |
| 2544 | fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust); |
| 2545 | if (fixp->fx_im_disp) |
| 2546 | { |
| 2547 | #ifdef TC_NS32K |
| 2548 | fprintf (stderr, " im_disp=%d", fixp->fx_im_disp); |
| 2549 | #else |
| 2550 | fprintf (stderr, " im_disp"); |
| 2551 | #endif |
| 2552 | } |
| 2553 | if (fixp->fx_tcbit) |
| 2554 | fprintf (stderr, " tcbit"); |
| 2555 | if (fixp->fx_done) |
| 2556 | fprintf (stderr, " done"); |
| 2557 | fprintf (stderr, "\n size=%d frag=", fixp->fx_size); |
| 2558 | fprintf_vma (stderr, (bfd_vma) ((bfd_hostptr_t) fixp->fx_frag)); |
| 2559 | fprintf (stderr, " where=%ld offset=%lx addnumber=%lx", |
| 2560 | (long) fixp->fx_where, |
| 2561 | (unsigned long) fixp->fx_offset, |
| 2562 | (unsigned long) fixp->fx_addnumber); |
| 2563 | fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type), |
| 2564 | fixp->fx_r_type); |
| 2565 | if (fixp->fx_addsy) |
| 2566 | { |
| 2567 | fprintf (stderr, "\n +<"); |
| 2568 | print_symbol_value_1 (stderr, fixp->fx_addsy); |
| 2569 | fprintf (stderr, ">"); |
| 2570 | } |
| 2571 | if (fixp->fx_subsy) |
| 2572 | { |
| 2573 | fprintf (stderr, "\n -<"); |
| 2574 | print_symbol_value_1 (stderr, fixp->fx_subsy); |
| 2575 | fprintf (stderr, ">"); |
| 2576 | } |
| 2577 | fprintf (stderr, "\n"); |
| 2578 | #ifdef TC_FIX_DATA_PRINT |
| 2579 | TC_FIX_DATA_PRINT (stderr, fixp); |
| 2580 | #endif |
| 2581 | } |