1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593
|
/* subsegs.c - subsegments -
Copyright (C) 1987, 90, 91, 92, 93, 94, 95, 96, 1997
Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
/*
* Segments & sub-segments.
*/
#include "as.h"
#include "subsegs.h"
#include "obstack.h"
frchainS *frchain_root, *frchain_now;
static struct obstack frchains;
#ifndef BFD_ASSEMBLER
#ifdef MANY_SEGMENTS
segment_info_type segment_info[SEG_MAXIMUM_ORDINAL];
#else
/* Commented in "subsegs.h". */
frchainS *data0_frchainP, *bss0_frchainP;
#endif /* MANY_SEGMENTS */
char const *const seg_name[] =
{
"absolute",
#ifdef MANY_SEGMENTS
"e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9",
"e10", "e11", "e12", "e13", "e14", "e15", "e16", "e17", "e18", "e19",
"e20", "e21", "e22", "e23", "e24", "e25", "e26", "e27", "e28", "e29",
"e30", "e31", "e32", "e33", "e34", "e35", "e36", "e37", "e38", "e39",
#else
"text",
"data",
"bss",
#endif /* MANY_SEGMENTS */
"unknown",
"ASSEMBLER-INTERNAL-LOGIC-ERROR!",
"expr",
"debug",
"transfert vector preload",
"transfert vector postload",
"register",
"",
}; /* Used by error reporters, dumpers etc. */
#else /* BFD_ASSEMBLER */
/* Gas segment information for bfd_abs_section_ptr and
bfd_und_section_ptr. */
static segment_info_type *abs_seg_info;
static segment_info_type *und_seg_info;
#endif /* BFD_ASSEMBLER */
static void subseg_set_rest PARAMS ((segT, subsegT));
static fragS dummy_frag;
static frchainS absolute_frchain;
void
subsegs_begin ()
{
/* Check table(s) seg_name[], seg_N_TYPE[] is in correct order */
#if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
know (SEG_ABSOLUTE == 0);
know (SEG_TEXT == 1);
know (SEG_DATA == 2);
know (SEG_BSS == 3);
know (SEG_UNKNOWN == 4);
know (SEG_GOOF == 5);
know (SEG_EXPR == 6);
know (SEG_DEBUG == 7);
know (SEG_NTV == 8);
know (SEG_PTV == 9);
know (SEG_REGISTER == 10);
know (SEG_MAXIMUM_ORDINAL == SEG_REGISTER);
#endif
obstack_begin (&frchains, chunksize);
#if __GNUC__ >= 2
obstack_alignment_mask (&frchains) = __alignof__ (frchainS) - 1;
#endif
frchain_root = NULL;
frchain_now = NULL; /* Warn new_subseg() that we are booting. */
frag_now = &dummy_frag;
#ifndef BFD_ASSEMBLER
now_subseg = 42; /* Lie for 1st call to subseg_new. */
#ifdef MANY_SEGMENTS
{
int i;
for (i = SEG_E0; i < SEG_UNKNOWN; i++)
{
subseg_set (i, 0);
segment_info[i].frchainP = frchain_now;
}
}
#else
subseg_set (SEG_DATA, 0); /* .data 0 */
data0_frchainP = frchain_now;
subseg_set (SEG_BSS, 0);
bss0_frchainP = frchain_now;
#endif /* ! MANY_SEGMENTS */
#endif /* ! BFD_ASSEMBLER */
absolute_frchain.frch_seg = absolute_section;
absolute_frchain.frch_subseg = 0;
#ifdef BFD_ASSEMBLER
absolute_frchain.fix_root = absolute_frchain.fix_tail = 0;
#endif
absolute_frchain.frch_frag_now = &zero_address_frag;
absolute_frchain.frch_root = absolute_frchain.frch_last = &zero_address_frag;
}
/*
* subseg_change()
*
* Change the subsegment we are in, BUT DO NOT MAKE A NEW FRAG for the
* subsegment. If we are already in the correct subsegment, change nothing.
* This is used eg as a worker for subseg_set [which does make a new frag_now]
* and for changing segments after we have read the source. We construct eg
* fixSs even after the source file is read, so we do have to keep the
* segment context correct.
*/
void
subseg_change (seg, subseg)
register segT seg;
register int subseg;
{
now_seg = seg;
now_subseg = subseg;
if (now_seg == absolute_section)
return;
#ifdef BFD_ASSEMBLER
{
segment_info_type *seginfo;
seginfo = (segment_info_type *) bfd_get_section_userdata (stdoutput, seg);
if (! seginfo)
{
seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
memset ((PTR) seginfo, 0, sizeof (*seginfo));
seginfo->fix_root = NULL;
seginfo->fix_tail = NULL;
seginfo->bfd_section = seg;
seginfo->sym = 0;
if (seg == bfd_abs_section_ptr)
abs_seg_info = seginfo;
else if (seg == bfd_und_section_ptr)
und_seg_info = seginfo;
else
bfd_set_section_userdata (stdoutput, seg, (PTR) seginfo);
}
}
#else
#ifdef MANY_SEGMENTS
seg_fix_rootP = &segment_info[seg].fix_root;
seg_fix_tailP = &segment_info[seg].fix_tail;
#else
if (seg == SEG_DATA)
{
seg_fix_rootP = &data_fix_root;
seg_fix_tailP = &data_fix_tail;
}
else if (seg == SEG_TEXT)
{
seg_fix_rootP = &text_fix_root;
seg_fix_tailP = &text_fix_tail;
}
else
{
know (seg == SEG_BSS);
seg_fix_rootP = &bss_fix_root;
seg_fix_tailP = &bss_fix_tail;
}
#endif
#endif
}
static void
subseg_set_rest (seg, subseg)
segT seg;
subsegT subseg;
{
register frchainS *frcP; /* crawl frchain chain */
register frchainS **lastPP; /* address of last pointer */
frchainS *newP; /* address of new frchain */
mri_common_symbol = NULL;
if (frag_now && frchain_now)
frchain_now->frch_frag_now = frag_now;
assert (frchain_now == 0
|| now_seg == undefined_section
|| now_seg == absolute_section
|| frchain_now->frch_last == frag_now);
subseg_change (seg, (int) subseg);
if (seg == absolute_section)
{
frchain_now = &absolute_frchain;
frag_now = &zero_address_frag;
return;
}
assert (frchain_now == 0
|| now_seg == undefined_section
|| frchain_now->frch_last == frag_now);
/*
* Attempt to find or make a frchain for that sub seg.
* Crawl along chain of frchainSs, begins @ frchain_root.
* If we need to make a frchainS, link it into correct
* position of chain rooted in frchain_root.
*/
for (frcP = *(lastPP = &frchain_root);
frcP && frcP->frch_seg <= seg;
frcP = *(lastPP = &frcP->frch_next))
{
if (frcP->frch_seg == seg
&& frcP->frch_subseg >= subseg)
{
break;
}
}
/*
* frcP: Address of the 1st frchainS in correct segment with
* frch_subseg >= subseg.
* We want to either use this frchainS, or we want
* to insert a new frchainS just before it.
*
* If frcP==NULL, then we are at the end of the chain
* of frchainS-s. A NULL frcP means we fell off the end
* of the chain looking for a
* frch_subseg >= subseg, so we
* must make a new frchainS.
*
* If we ever maintain a pointer to
* the last frchainS in the chain, we change that pointer
* ONLY when frcP==NULL.
*
* lastPP: Address of the pointer with value frcP;
* Never NULL.
* May point to frchain_root.
*
*/
if (!frcP
|| (frcP->frch_seg > seg
|| frcP->frch_subseg > subseg)) /* Kinky logic only works with 2 segments. */
{
/*
* This should be the only code that creates a frchainS.
*/
newP = (frchainS *) obstack_alloc (&frchains, sizeof (frchainS));
newP->frch_subseg = subseg;
newP->frch_seg = seg;
#ifdef BFD_ASSEMBLER
newP->fix_root = NULL;
newP->fix_tail = NULL;
#endif
obstack_begin (&newP->frch_obstack, chunksize);
#if __GNUC__ >= 2
obstack_alignment_mask (&newP->frch_obstack) = __alignof__ (fragS) - 1;
#endif
newP->frch_frag_now = frag_alloc (&newP->frch_obstack);
newP->frch_frag_now->fr_type = rs_fill;
newP->frch_root = newP->frch_last = newP->frch_frag_now;
*lastPP = newP;
newP->frch_next = frcP; /* perhaps NULL */
frcP = newP;
}
/*
* Here with frcP pointing to the frchainS for subseg.
*/
frchain_now = frcP;
frag_now = frcP->frch_frag_now;
assert (frchain_now->frch_last == frag_now);
}
/*
* subseg_set(segT, subsegT)
*
* If you attempt to change to the current subsegment, nothing happens.
*
* In: segT, subsegT code for new subsegment.
* frag_now -> incomplete frag for current subsegment.
* If frag_now==NULL, then there is no old, incomplete frag, so
* the old frag is not closed off.
*
* Out: now_subseg, now_seg updated.
* Frchain_now points to the (possibly new) struct frchain for this
* sub-segment.
* Frchain_root updated if needed.
*/
#ifndef BFD_ASSEMBLER
segT
subseg_new (segname, subseg)
const char *segname;
subsegT subseg;
{
int i;
for (i = 0; i < (int) SEG_MAXIMUM_ORDINAL; i++)
{
const char *s;
s = segment_name ((segT) i);
if (strcmp (segname, s) == 0
|| (segname[0] == '.'
&& strcmp (segname + 1, s) == 0))
{
subseg_set ((segT) i, subseg);
return (segT) i;
}
#ifdef obj_segment_name
s = obj_segment_name ((segT) i);
if (strcmp (segname, s) == 0
|| (segname[0] == '.'
&& strcmp (segname + 1, s) == 0))
{
subseg_set ((segT) i, subseg);
return (segT) i;
}
#endif
}
#ifdef obj_add_segment
{
segT new_seg;
new_seg = obj_add_segment (segname);
subseg_set (new_seg, subseg);
return new_seg;
}
#else
as_bad ("Attempt to switch to nonexistent segment \"%s\"", segname);
return now_seg;
#endif
}
void
subseg_set (seg, subseg) /* begin assembly for a new sub-segment */
register segT seg; /* SEG_DATA or SEG_TEXT */
register subsegT subseg;
{
#ifndef MANY_SEGMENTS
know (seg == SEG_DATA
|| seg == SEG_TEXT
|| seg == SEG_BSS
|| seg == SEG_ABSOLUTE);
#endif
if (seg != now_seg || subseg != now_subseg)
{ /* we just changed sub-segments */
subseg_set_rest (seg, subseg);
}
mri_common_symbol = NULL;
}
#else /* BFD_ASSEMBLER */
segT
subseg_get (segname, force_new)
const char *segname;
int force_new;
{
segT secptr;
segment_info_type *seginfo;
const char *now_seg_name = (now_seg
? bfd_get_section_name (stdoutput, now_seg)
: 0);
if (!force_new
&& now_seg_name
&& (now_seg_name == segname
|| !strcmp (now_seg_name, segname)))
return now_seg;
if (!force_new)
secptr = bfd_make_section_old_way (stdoutput, segname);
else
secptr = bfd_make_section_anyway (stdoutput, segname);
seginfo = seg_info (secptr);
if (! seginfo)
{
/* Check whether output_section is set first because secptr may
be bfd_abs_section_ptr. */
if (secptr->output_section != secptr)
secptr->output_section = secptr;
seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
memset ((PTR) seginfo, 0, sizeof (*seginfo));
seginfo->fix_root = NULL;
seginfo->fix_tail = NULL;
seginfo->bfd_section = secptr;
if (secptr == bfd_abs_section_ptr)
abs_seg_info = seginfo;
else if (secptr == bfd_und_section_ptr)
und_seg_info = seginfo;
else
bfd_set_section_userdata (stdoutput, secptr, (PTR) seginfo);
seginfo->frchainP = NULL;
seginfo->lineno_list_head = seginfo->lineno_list_tail = NULL;
seginfo->sym = NULL;
seginfo->dot = NULL;
}
return secptr;
}
segT
subseg_new (segname, subseg)
const char *segname;
subsegT subseg;
{
segT secptr;
segment_info_type *seginfo;
secptr = subseg_get (segname, 0);
subseg_set_rest (secptr, subseg);
seginfo = seg_info (secptr);
if (! seginfo->frchainP)
seginfo->frchainP = frchain_now;
return secptr;
}
/* Like subseg_new, except a new section is always created, even if
a section with that name already exists. */
segT
subseg_force_new (segname, subseg)
const char *segname;
subsegT subseg;
{
segT secptr;
segment_info_type *seginfo;
secptr = subseg_get (segname, 1);
subseg_set_rest (secptr, subseg);
seginfo = seg_info (secptr);
if (! seginfo->frchainP)
seginfo->frchainP = frchain_now;
return secptr;
}
void
subseg_set (secptr, subseg)
segT secptr;
subsegT subseg;
{
if (! (secptr == now_seg && subseg == now_subseg))
subseg_set_rest (secptr, subseg);
mri_common_symbol = NULL;
}
#ifndef obj_sec_sym_ok_for_reloc
#define obj_sec_sym_ok_for_reloc(SEC) 0
#endif
/* Get the gas information we are storing for a section. */
segment_info_type *
seg_info (sec)
segT sec;
{
if (sec == bfd_abs_section_ptr)
return abs_seg_info;
else if (sec == bfd_und_section_ptr)
return und_seg_info;
else
return (segment_info_type *) bfd_get_section_userdata (stdoutput, sec);
}
symbolS *
section_symbol (sec)
segT sec;
{
segment_info_type *seginfo = seg_info (sec);
symbolS *s;
if (seginfo == 0)
abort ();
if (seginfo->sym)
return seginfo->sym;
#ifndef EMIT_SECTION_SYMBOLS
#define EMIT_SECTION_SYMBOLS 1
#endif
if (! EMIT_SECTION_SYMBOLS
#ifdef BFD_ASSEMBLER
|| symbol_table_frozen
#endif
)
/* Here we know it won't be going into the symbol table. */
s = symbol_create (sec->name, sec, 0, &zero_address_frag);
else
s = symbol_new (sec->name, sec, 0, &zero_address_frag);
S_CLEAR_EXTERNAL (s);
/* Use the BFD section symbol, if possible. */
if (obj_sec_sym_ok_for_reloc (sec))
s->bsym = sec->symbol;
seginfo->sym = s;
return s;
}
#endif /* BFD_ASSEMBLER */
void
subsegs_print_statistics (file)
FILE *file;
{
frchainS *frchp;
fprintf (file, "frag chains:\n");
for (frchp = frchain_root; frchp; frchp = frchp->frch_next)
{
int count = 0;
fragS *fragp;
/* If frch_subseg is non-zero, it's probably been chained onto
the end of a previous subsection. Don't count it again. */
if (frchp->frch_subseg != 0)
continue;
/* Skip gas-internal sections. */
if (segment_name (frchp->frch_seg)[0] == '*')
continue;
for (fragp = frchp->frch_root; fragp; fragp = fragp->fr_next)
{
#if 0
switch (fragp->fr_type)
{
case rs_fill:
fprintf (file, "f"); break;
case rs_align:
fprintf (file, "a"); break;
case rs_align_code:
fprintf (file, "c"); break;
case rs_org:
fprintf (file, "o"); break;
case rs_machine_dependent:
fprintf (file, "m"); break;
case rs_space:
fprintf (file, "s"); break;
case 0:
fprintf (file, "0"); break;
default:
fprintf (file, "?"); break;
}
#endif
count++;
}
fprintf (file, "\n");
fprintf (file, "\t%p %-10s\t%10d frags\n", frchp,
segment_name (frchp->frch_seg), count);
}
}
/* end of subsegs.c */
|