gas/dw2gencfi.c

   1 /* dw2gencfi.c - Support for generating Dwarf2 CFI information.
   2    Copyright (C) 2003-2017 Free Software Foundation, Inc.
   3    Contributed by Michal Ludvig <mludvig@suse.cz>
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    GAS is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GAS; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  20    02110-1301, USA.  */
  21
  22 #include "as.h"
  23 #include "dw2gencfi.h"
  24 #include "subsegs.h"
  25 #include "dwarf2dbg.h"
  26
  27 #ifdef TARGET_USE_CFIPOP
  28
  29 /* By default, use difference expressions if DIFF_EXPR_OK is defined.  */
  30 #ifndef CFI_DIFF_EXPR_OK
  31 # ifdef DIFF_EXPR_OK
  32 #  define CFI_DIFF_EXPR_OK 1
  33 # else
  34 #  define CFI_DIFF_EXPR_OK 0
  35 # endif
  36 #endif
  37
  38 #ifndef CFI_DIFF_LSDA_OK
  39 #define CFI_DIFF_LSDA_OK CFI_DIFF_EXPR_OK
  40 #endif
  41
  42 #if CFI_DIFF_EXPR_OK == 1 && CFI_DIFF_LSDA_OK == 0
  43 # error "CFI_DIFF_EXPR_OK should imply CFI_DIFF_LSDA_OK"
  44 #endif
  45
  46 /* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field
  47    of the CIE.  Default to 1 if not otherwise specified.  */
  48 #ifndef DWARF2_LINE_MIN_INSN_LENGTH
  49 #define DWARF2_LINE_MIN_INSN_LENGTH 1
  50 #endif
  51
  52 /* By default, use 32-bit relocations from .eh_frame into .text.  */
  53 #ifndef DWARF2_FDE_RELOC_SIZE
  54 #define DWARF2_FDE_RELOC_SIZE 4
  55 #endif
  56
  57 /* By default, use a read-only .eh_frame section.  */
  58 #ifndef DWARF2_EH_FRAME_READ_ONLY
  59 #define DWARF2_EH_FRAME_READ_ONLY SEC_READONLY
  60 #endif
  61
  62 #ifndef EH_FRAME_ALIGNMENT
  63 #define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2)
  64 #endif
  65
  66 #ifndef tc_cfi_frame_initial_instructions
  67 #define tc_cfi_frame_initial_instructions() ((void)0)
  68 #endif
  69
  70 #ifndef tc_cfi_startproc
  71 # define tc_cfi_startproc() ((void)0)
  72 #endif
  73
  74 #ifndef tc_cfi_endproc
  75 # define tc_cfi_endproc(fde) ((void) (fde))
  76 #endif
  77
  78 #define EH_FRAME_LINKONCE (SUPPORT_FRAME_LINKONCE || compact_eh)
  79
  80 #ifndef DWARF2_FORMAT
  81 #define DWARF2_FORMAT(SEC) dwarf2_format_32bit
  82 #endif
  83
  84 #ifndef DWARF2_ADDR_SIZE
  85 #define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8)
  86 #endif
  87
  88 #if MULTIPLE_FRAME_SECTIONS
  89 #define CUR_SEG(structp) structp->cur_seg
  90 #define SET_CUR_SEG(structp, seg) structp->cur_seg = seg
  91 #define HANDLED(structp) structp->handled
  92 #define SET_HANDLED(structp, val) structp->handled = val
  93 #else
  94 #define CUR_SEG(structp) NULL
  95 #define SET_CUR_SEG(structp, seg) (void) (0 && seg)
  96 #define HANDLED(structp) 0
  97 #define SET_HANDLED(structp, val) (void) (0 && val)
  98 #endif
  99
 100 #ifndef tc_cfi_reloc_for_encoding
 101 #define tc_cfi_reloc_for_encoding(e) BFD_RELOC_NONE
 102 #endif
 103
 104 /* Private segment collection list.  */
 105 struct dwcfi_seg_list
 106 {
 107   segT   seg;
 108   int    subseg;
 109   char * seg_name;
 110 };
 111
 112 #ifdef SUPPORT_COMPACT_EH
 113 static bfd_boolean compact_eh;
 114 #else
 115 #define compact_eh 0
 116 #endif
 117
 118 static struct hash_control *dwcfi_hash;
 119 \f
 120 /* Emit a single byte into the current segment.  */
 121
 122 static inline void
 123 out_one (int byte)
 124 {
 125   FRAG_APPEND_1_CHAR (byte);
 126 }
 127
 128 /* Emit a two-byte word into the current segment.  */
 129
 130 static inline void
 131 out_two (int data)
 132 {
 133   md_number_to_chars (frag_more (2), data, 2);
 134 }
 135
 136 /* Emit a four byte word into the current segment.  */
 137
 138 static inline void
 139 out_four (int data)
 140 {
 141   md_number_to_chars (frag_more (4), data, 4);
 142 }
 143
 144 /* Emit an unsigned "little-endian base 128" number.  */
 145
 146 static void
 147 out_uleb128 (addressT value)
 148 {
 149   output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0);
 150 }
 151
 152 /* Emit an unsigned "little-endian base 128" number.  */
 153
 154 static void
 155 out_sleb128 (offsetT value)
 156 {
 157   output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1);
 158 }
 159
 160 static unsigned int
 161 encoding_size (unsigned char encoding)
 162 {
 163   if (encoding == DW_EH_PE_omit)
 164     return 0;
 165   switch (encoding & 0x7)
 166     {
 167     case 0:
 168       return bfd_get_arch_size (stdoutput) == 64 ? 8 : 4;
 169     case DW_EH_PE_udata2:
 170       return 2;
 171     case DW_EH_PE_udata4:
 172       return 4;
 173     case DW_EH_PE_udata8:
 174       return 8;
 175     default:
 176       abort ();
 177     }
 178 }
 179
 180 /* Emit expression EXP in ENCODING.  If EMIT_ENCODING is true, first
 181    emit a byte containing ENCODING.  */
 182
 183 static void
 184 emit_expr_encoded (expressionS *exp, int encoding, bfd_boolean emit_encoding)
 185 {
 186   unsigned int size = encoding_size (encoding);
 187   bfd_reloc_code_real_type code;
 188
 189   if (encoding == DW_EH_PE_omit)
 190     return;
 191
 192   if (emit_encoding)
 193     out_one (encoding);
 194
 195   code = tc_cfi_reloc_for_encoding (encoding);
 196   if (code != BFD_RELOC_NONE)
 197     {
 198       reloc_howto_type *howto = bfd_reloc_type_lookup (stdoutput, code);
 199       char *p = frag_more (size);
 200       gas_assert (size == howto->bitsize / 8);
 201       md_number_to_chars (p, 0, size);
 202       fix_new (frag_now, p - frag_now->fr_literal, size, exp->X_add_symbol,
 203                exp->X_add_number, howto->pc_relative, code);
 204     }
 205   else if ((encoding & 0x70) == DW_EH_PE_pcrel)
 206     {
 207 #if CFI_DIFF_EXPR_OK
 208       expressionS tmp = *exp;
 209       tmp.X_op = O_subtract;
 210       tmp.X_op_symbol = symbol_temp_new_now ();
 211       emit_expr (&tmp, size);
 212 #elif defined (tc_cfi_emit_pcrel_expr)
 213       tc_cfi_emit_pcrel_expr (exp, size);
 214 #else
 215       abort ();
 216 #endif
 217     }
 218   else
 219     emit_expr (exp, size);
 220 }
 221 \f
 222 /* Build based on segment the derived .debug_...
 223    segment name containing origin segment's postfix name part.  */
 224
 225 static char *
 226 get_debugseg_name (segT seg, const char *base_name)
 227 {
 228   const char *name;
 229
 230   if (!seg)
 231     name = "";
 232   else
 233     {
 234       const char * dollar;
 235       const char * dot;
 236
 237       name = bfd_get_section_name (stdoutput, seg);
 238
 239       dollar = strchr (name, '$');
 240       dot = strchr (name + 1, '.');
 241
 242       if (!dollar && !dot)
 243         {
 244           if (!strcmp (base_name, ".eh_frame_entry")
 245               && strcmp (name, ".text") != 0)
 246             return concat (base_name, ".", name, NULL);
 247
 248           name = "";
 249         }
 250       else if (!dollar)
 251         name = dot;
 252       else if (!dot)
 253         name = dollar;
 254       else if (dot < dollar)
 255         name = dot;
 256       else
 257         name = dollar;
 258     }
 259
 260   return concat (base_name, name, NULL);
 261 }
 262
 263 /* Allocate a dwcfi_seg_list structure.  */
 264
 265 static struct dwcfi_seg_list *
 266 alloc_debugseg_item (segT seg, int subseg, char *name)
 267 {
 268   struct dwcfi_seg_list *r;
 269
 270   r = (struct dwcfi_seg_list *)
 271     xmalloc (sizeof (struct dwcfi_seg_list) + strlen (name));
 272   r->seg = seg;
 273   r->subseg = subseg;
 274   r->seg_name = name;
 275   return r;
 276 }
 277
 278 static segT
 279 is_now_linkonce_segment (void)
 280 {
 281   if (compact_eh)
 282     return now_seg;
 283
 284   if ((bfd_get_section_flags (stdoutput, now_seg)
 285        & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
 286           | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
 287           | SEC_LINK_DUPLICATES_SAME_CONTENTS)) != 0)
 288     return now_seg;
 289   return NULL;
 290 }
 291
 292 /* Generate debug... segment with same linkonce properties
 293    of based segment.  */
 294
 295 static segT
 296 make_debug_seg (segT cseg, char *name, int sflags)
 297 {
 298   segT save_seg = now_seg;
 299   int save_subseg = now_subseg;
 300   segT r;
 301   flagword flags;
 302
 303   r = subseg_new (name, 0);
 304
 305   /* Check if code segment is marked as linked once.  */
 306   if (!cseg)
 307     flags = 0;
 308   else
 309     flags = bfd_get_section_flags (stdoutput, cseg)
 310       & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD
 311          | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE
 312          | SEC_LINK_DUPLICATES_SAME_CONTENTS);
 313
 314   /* Add standard section flags.  */
 315   flags |= sflags;
 316
 317   /* Apply possibly linked once flags to new generated segment, too.  */
 318   if (!bfd_set_section_flags (stdoutput, r, flags))
 319     as_bad (_("bfd_set_section_flags: %s"),
 320             bfd_errmsg (bfd_get_error ()));
 321
 322   /* Restore to previous segment.  */
 323   if (save_seg != NULL)
 324     subseg_set (save_seg, save_subseg);
 325   return r;
 326 }
 327
 328 static void
 329 dwcfi_hash_insert (const char *name, struct dwcfi_seg_list *item)
 330 {
 331   const char *error_string;
 332
 333   if ((error_string = hash_jam (dwcfi_hash, name, (char *) item)))
 334     as_fatal (_("Inserting \"%s\" into structure table failed: %s"),
 335               name, error_string);
 336 }
 337
 338 static struct dwcfi_seg_list *
 339 dwcfi_hash_find (char *name)
 340 {
 341   return (struct dwcfi_seg_list *) hash_find (dwcfi_hash, name);
 342 }
 343
 344 static struct dwcfi_seg_list *
 345 dwcfi_hash_find_or_make (segT cseg, const char *base_name, int flags)
 346 {
 347   struct dwcfi_seg_list *item;
 348   char *name;
 349
 350   /* Initialize dwcfi_hash once.  */
 351   if (!dwcfi_hash)
 352     dwcfi_hash = hash_new ();
 353
 354   name = get_debugseg_name (cseg, base_name);
 355
 356   item = dwcfi_hash_find (name);
 357   if (!item)
 358     {
 359       item = alloc_debugseg_item (make_debug_seg (cseg, name, flags), 0, name);
 360
 361       dwcfi_hash_insert (item->seg_name, item);
 362     }
 363   else
 364     free (name);
 365
 366   return item;
 367 }
 368
 369 /* ??? Share this with dwarf2cfg.c.  */
 370 #ifndef TC_DWARF2_EMIT_OFFSET
 371 #define TC_DWARF2_EMIT_OFFSET  generic_dwarf2_emit_offset
 372
 373 /* Create an offset to .dwarf2_*.  */
 374
 375 static void
 376 generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size)
 377 {
 378   expressionS exp;
 379
 380   exp.X_op = O_symbol;
 381   exp.X_add_symbol = symbol;
 382   exp.X_add_number = 0;
 383   emit_expr (&exp, size);
 384 }
 385 #endif
 386
 387 struct cfi_escape_data
 388 {
 389   struct cfi_escape_data *next;
 390   expressionS exp;
 391 };
 392
 393 struct cie_entry
 394 {
 395   struct cie_entry *next;
 396 #if MULTIPLE_FRAME_SECTIONS
 397   segT cur_seg;
 398 #endif
 399   symbolS *start_address;
 400   unsigned int return_column;
 401   unsigned int signal_frame;
 402   unsigned char fde_encoding;
 403   unsigned char per_encoding;
 404   unsigned char lsda_encoding;
 405   expressionS personality;
 406   struct cfi_insn_data *first, *last;
 407 };
 408
 409 /* List of FDE entries.  */
 410
 411 struct fde_entry *all_fde_data;
 412 static struct fde_entry **last_fde_data = &all_fde_data;
 413
 414 /* List of CIEs so that they could be reused.  */
 415 static struct cie_entry *cie_root;
 416
 417 /* Stack of old CFI data, for save/restore.  */
 418 struct cfa_save_data
 419 {
 420   struct cfa_save_data *next;
 421   offsetT cfa_offset;
 422 };
 423
 424 /* Current open FDE entry.  */
 425 struct frch_cfi_data
 426 {
 427   struct fde_entry *cur_fde_data;
 428   symbolS *last_address;
 429   offsetT cur_cfa_offset;
 430   struct cfa_save_data *cfa_save_stack;
 431 };
 432 \f
 433 /* Construct a new FDE structure and add it to the end of the fde list.  */
 434
 435 static struct fde_entry *
 436 alloc_fde_entry (void)
 437 {
 438   struct fde_entry *fde = XCNEW (struct fde_entry);
 439
 440   frchain_now->frch_cfi_data = XCNEW (struct frch_cfi_data);
 441   frchain_now->frch_cfi_data->cur_fde_data = fde;
 442   *last_fde_data = fde;
 443   last_fde_data = &fde->next;
 444   SET_CUR_SEG (fde, is_now_linkonce_segment ());
 445   SET_HANDLED (fde, 0);
 446   fde->last = &fde->data;
 447   fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN;
 448   fde->per_encoding = DW_EH_PE_omit;
 449   fde->lsda_encoding = DW_EH_PE_omit;
 450   fde->eh_header_type = EH_COMPACT_UNKNOWN;
 451
 452   return fde;
 453 }
 454
 455 /* The following functions are available for a backend to construct its
 456    own unwind information, usually from legacy unwind directives.  */
 457
 458 /* Construct a new INSN structure and add it to the end of the insn list
 459    for the currently active FDE.  */
 460
 461 static bfd_boolean cfi_sections_set = FALSE;
 462 static int cfi_sections = CFI_EMIT_eh_frame;
 463 int all_cfi_sections = 0;
 464 static struct fde_entry *last_fde;
 465
 466 static struct cfi_insn_data *
 467 alloc_cfi_insn_data (void)
 468 {
 469   struct cfi_insn_data *insn = XCNEW (struct cfi_insn_data);
 470   struct fde_entry *cur_fde_data = frchain_now->frch_cfi_data->cur_fde_data;
 471
 472   *cur_fde_data->last = insn;
 473   cur_fde_data->last = &insn->next;
 474   SET_CUR_SEG (insn, is_now_linkonce_segment ());
 475   return insn;
 476 }
 477
 478 /* Construct a new FDE structure that begins at LABEL.  */
 479
 480 void
 481 cfi_new_fde (symbolS *label)
 482 {
 483   struct fde_entry *fde = alloc_fde_entry ();
 484   fde->start_address = label;
 485   frchain_now->frch_cfi_data->last_address = label;
 486 }
 487
 488 /* End the currently open FDE.  */
 489
 490 void
 491 cfi_end_fde (symbolS *label)
 492 {
 493   frchain_now->frch_cfi_data->cur_fde_data->end_address = label;
 494   free (frchain_now->frch_cfi_data);
 495   frchain_now->frch_cfi_data = NULL;
 496 }
 497
 498 /* Set the return column for the current FDE.  */
 499
 500 void
 501 cfi_set_return_column (unsigned regno)
 502 {
 503   frchain_now->frch_cfi_data->cur_fde_data->return_column = regno;
 504 }
 505
 506 void
 507 cfi_set_sections (void)
 508 {
 509   frchain_now->frch_cfi_data->cur_fde_data->sections = all_cfi_sections;
 510   cfi_sections_set = TRUE;
 511 }
 512
 513 /* Universal functions to store new instructions.  */
 514
 515 static void
 516 cfi_add_CFA_insn (int insn)
 517 {
 518   struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
 519
 520   insn_ptr->insn = insn;
 521 }
 522
 523 static void
 524 cfi_add_CFA_insn_reg (int insn, unsigned regno)
 525 {
 526   struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
 527
 528   insn_ptr->insn = insn;
 529   insn_ptr->u.r = regno;
 530 }
 531
 532 static void
 533 cfi_add_CFA_insn_offset (int insn, offsetT offset)
 534 {
 535   struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
 536
 537   insn_ptr->insn = insn;
 538   insn_ptr->u.i = offset;
 539 }
 540
 541 static void
 542 cfi_add_CFA_insn_reg_reg (int insn, unsigned reg1, unsigned reg2)
 543 {
 544   struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
 545
 546   insn_ptr->insn = insn;
 547   insn_ptr->u.rr.reg1 = reg1;
 548   insn_ptr->u.rr.reg2 = reg2;
 549 }
 550
 551 static void
 552 cfi_add_CFA_insn_reg_offset (int insn, unsigned regno, offsetT offset)
 553 {
 554   struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data ();
 555
 556   insn_ptr->insn = insn;
 557   insn_ptr->u.ri.reg = regno;
 558   insn_ptr->u.ri.offset = offset;
 559 }
 560
 561 /* Add a CFI insn to advance the PC from the last address to LABEL.  */
 562
 563 void
 564 cfi_add_advance_loc (symbolS *label)
 565 {
 566   struct cfi_insn_data *insn = alloc_cfi_insn_data ();
 567
 568   insn->insn = DW_CFA_advance_loc;
 569   insn->u.ll.lab1 = frchain_now->frch_cfi_data->last_address;
 570   insn->u.ll.lab2 = label;
 571
 572   frchain_now->frch_cfi_data->last_address = label;
 573 }
 574
 575 /* Add a CFI insn to label the current position in the CFI segment.  */
 576
 577 void
 578 cfi_add_label (const char *name)
 579 {
 580   unsigned int len = strlen (name) + 1;
 581   struct cfi_insn_data *insn = alloc_cfi_insn_data ();
 582
 583   insn->insn = CFI_label;
 584   obstack_grow (&notes, name, len);
 585   insn->u.sym_name = (char *) obstack_finish (&notes);
 586 }
 587
 588 /* Add a DW_CFA_offset record to the CFI data.  */
 589
 590 void
 591 cfi_add_CFA_offset (unsigned regno, offsetT offset)
 592 {
 593   unsigned int abs_data_align;
 594
 595   gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0);
 596   cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset);
 597
 598   abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0
 599                     ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT);
 600   if (offset % abs_data_align)
 601     as_bad (_("register save offset not a multiple of %u"), abs_data_align);
 602 }
 603
 604 /* Add a DW_CFA_val_offset record to the CFI data.  */
 605
 606 void
 607 cfi_add_CFA_val_offset (unsigned regno, offsetT offset)
 608 {
 609   unsigned int abs_data_align;
 610
 611   gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0);
 612   cfi_add_CFA_insn_reg_offset (DW_CFA_val_offset, regno, offset);
 613
 614   abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0
 615                     ? -DWARF2_CIE_DATA_ALIGNMENT : DWARF2_CIE_DATA_ALIGNMENT);
 616   if (offset % abs_data_align)
 617     as_bad (_("register save offset not a multiple of %u"), abs_data_align);
 618 }
 619
 620 /* Add a DW_CFA_def_cfa record to the CFI data.  */
 621
 622 void
 623 cfi_add_CFA_def_cfa (unsigned regno, offsetT offset)
 624 {
 625   cfi_add_CFA_insn_reg_offset (DW_CFA_def_cfa, regno, offset);
 626   frchain_now->frch_cfi_data->cur_cfa_offset = offset;
 627 }
 628
 629 /* Add a DW_CFA_register record to the CFI data.  */
 630
 631 void
 632 cfi_add_CFA_register (unsigned reg1, unsigned reg2)
 633 {
 634   cfi_add_CFA_insn_reg_reg (DW_CFA_register, reg1, reg2);
 635 }
 636
 637 /* Add a DW_CFA_def_cfa_register record to the CFI data.  */
 638
 639 void
 640 cfi_add_CFA_def_cfa_register (unsigned regno)
 641 {
 642   cfi_add_CFA_insn_reg (DW_CFA_def_cfa_register, regno);
 643 }
 644
 645 /* Add a DW_CFA_def_cfa_offset record to the CFI data.  */
 646
 647 void
 648 cfi_add_CFA_def_cfa_offset (offsetT offset)
 649 {
 650   cfi_add_CFA_insn_offset (DW_CFA_def_cfa_offset, offset);
 651   frchain_now->frch_cfi_data->cur_cfa_offset = offset;
 652 }
 653
 654 void
 655 cfi_add_CFA_restore (unsigned regno)
 656 {
 657   cfi_add_CFA_insn_reg (DW_CFA_restore, regno);
 658 }
 659
 660 void
 661 cfi_add_CFA_undefined (unsigned regno)
 662 {
 663   cfi_add_CFA_insn_reg (DW_CFA_undefined, regno);
 664 }
 665
 666 void
 667 cfi_add_CFA_same_value (unsigned regno)
 668 {
 669   cfi_add_CFA_insn_reg (DW_CFA_same_value, regno);
 670 }
 671
 672 void
 673 cfi_add_CFA_remember_state (void)
 674 {
 675   struct cfa_save_data *p;
 676
 677   cfi_add_CFA_insn (DW_CFA_remember_state);
 678
 679   p = XNEW (struct cfa_save_data);
 680   p->cfa_offset = frchain_now->frch_cfi_data->cur_cfa_offset;
 681   p->next = frchain_now->frch_cfi_data->cfa_save_stack;
 682   frchain_now->frch_cfi_data->cfa_save_stack = p;
 683 }
 684
 685 void
 686 cfi_add_CFA_restore_state (void)
 687 {
 688   struct cfa_save_data *p;
 689
 690   cfi_add_CFA_insn (DW_CFA_restore_state);
 691
 692   p = frchain_now->frch_cfi_data->cfa_save_stack;
 693   if (p)
 694     {
 695       frchain_now->frch_cfi_data->cur_cfa_offset = p->cfa_offset;
 696       frchain_now->frch_cfi_data->cfa_save_stack = p->next;
 697       free (p);
 698     }
 699   else
 700     as_bad (_("CFI state restore without previous remember"));
 701 }
 702
 703 \f
 704 /* Parse CFI assembler directives.  */
 705
 706 static void dot_cfi (int);
 707 static void dot_cfi_escape (int);
 708 static void dot_cfi_sections (int);
 709 static void dot_cfi_startproc (int);
 710 static void dot_cfi_endproc (int);
 711 static void dot_cfi_fde_data (int);
 712 static void dot_cfi_personality (int);
 713 static void dot_cfi_personality_id (int);
 714 static void dot_cfi_lsda (int);
 715 static void dot_cfi_val_encoded_addr (int);
 716 static void dot_cfi_inline_lsda (int);
 717 static void dot_cfi_label (int);
 718
 719 const pseudo_typeS cfi_pseudo_table[] =
 720   {
 721     { "cfi_sections", dot_cfi_sections, 0 },
 722     { "cfi_startproc", dot_cfi_startproc, 0 },
 723     { "cfi_endproc", dot_cfi_endproc, 0 },
 724     { "cfi_fde_data", dot_cfi_fde_data, 0 },
 725     { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa },
 726     { "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register },
 727     { "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset },
 728     { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset },
 729     { "cfi_offset", dot_cfi, DW_CFA_offset },
 730     { "cfi_rel_offset", dot_cfi, CFI_rel_offset },
 731     { "cfi_register", dot_cfi, DW_CFA_register },
 732     { "cfi_return_column", dot_cfi, CFI_return_column },
 733     { "cfi_restore", dot_cfi, DW_CFA_restore },
 734     { "cfi_undefined", dot_cfi, DW_CFA_undefined },
 735     { "cfi_same_value", dot_cfi, DW_CFA_same_value },
 736     { "cfi_remember_state", dot_cfi, DW_CFA_remember_state },
 737     { "cfi_restore_state", dot_cfi, DW_CFA_restore_state },
 738     { "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save },
 739     { "cfi_escape", dot_cfi_escape, 0 },
 740     { "cfi_signal_frame", dot_cfi, CFI_signal_frame },
 741     { "cfi_personality", dot_cfi_personality, 0 },
 742     { "cfi_personality_id", dot_cfi_personality_id, 0 },
 743     { "cfi_lsda", dot_cfi_lsda, 0 },
 744     { "cfi_val_encoded_addr", dot_cfi_val_encoded_addr, 0 },
 745     { "cfi_inline_lsda", dot_cfi_inline_lsda, 0 },
 746     { "cfi_label", dot_cfi_label, 0 },
 747     { "cfi_val_offset", dot_cfi, DW_CFA_val_offset },
 748     { NULL, NULL, 0 }
 749   };
 750
 751 static void
 752 cfi_parse_separator (void)
 753 {
 754   SKIP_WHITESPACE ();
 755   if (*input_line_pointer == ',')
 756     input_line_pointer++;
 757   else
 758     as_bad (_("missing separator"));
 759 }
 760
 761 #ifndef tc_parse_to_dw2regnum
 762 static void
 763 tc_parse_to_dw2regnum (expressionS *exp)
 764 {
 765 # ifdef tc_regname_to_dw2regnum
 766   SKIP_WHITESPACE ();
 767   if (is_name_beginner (*input_line_pointer)
 768       || (*input_line_pointer == '%'
 769           && is_name_beginner (*++input_line_pointer)))
 770     {
 771       char *name, c;
 772
 773       c = get_symbol_name (& name);
 774
 775       exp->X_op = O_constant;
 776       exp->X_add_number = tc_regname_to_dw2regnum (name);
 777
 778       restore_line_pointer (c);
 779     }
 780   else
 781 # endif
 782     expression_and_evaluate (exp);
 783 }
 784 #endif
 785
 786 static unsigned
 787 cfi_parse_reg (void)
 788 {
 789   int regno;
 790   expressionS exp;
 791
 792   tc_parse_to_dw2regnum (&exp);
 793   switch (exp.X_op)
 794     {
 795     case O_register:
 796     case O_constant:
 797       regno = exp.X_add_number;
 798       break;
 799
 800     default:
 801       regno = -1;
 802       break;
 803     }
 804
 805   if (regno < 0)
 806     {
 807       as_bad (_("bad register expression"));
 808       regno = 0;
 809     }
 810
 811   return regno;
 812 }
 813
 814 static offsetT
 815 cfi_parse_const (void)
 816 {
 817   return get_absolute_expression ();
 818 }
 819
 820 static void
 821 dot_cfi (int arg)
 822 {
 823   offsetT offset;
 824   unsigned reg1, reg2;
 825
 826   if (frchain_now->frch_cfi_data == NULL)
 827     {
 828       as_bad (_("CFI instruction used without previous .cfi_startproc"));
 829       ignore_rest_of_line ();
 830       return;
 831     }
 832
 833   /* If the last address was not at the current PC, advance to current.  */
 834   if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
 835       || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
 836           != frag_now_fix ()))
 837     cfi_add_advance_loc (symbol_temp_new_now ());
 838
 839   switch (arg)
 840     {
 841     case DW_CFA_offset:
 842       reg1 = cfi_parse_reg ();
 843       cfi_parse_separator ();
 844       offset = cfi_parse_const ();
 845       cfi_add_CFA_offset (reg1, offset);
 846       break;
 847
 848     case DW_CFA_val_offset:
 849       reg1 = cfi_parse_reg ();
 850       cfi_parse_separator ();
 851       offset = cfi_parse_const ();
 852       cfi_add_CFA_val_offset (reg1, offset);
 853       break;
 854
 855     case CFI_rel_offset:
 856       reg1 = cfi_parse_reg ();
 857       cfi_parse_separator ();
 858       offset = cfi_parse_const ();
 859       cfi_add_CFA_offset (reg1,
 860                           offset - frchain_now->frch_cfi_data->cur_cfa_offset);
 861       break;
 862
 863     case DW_CFA_def_cfa:
 864       reg1 = cfi_parse_reg ();
 865       cfi_parse_separator ();
 866       offset = cfi_parse_const ();
 867       cfi_add_CFA_def_cfa (reg1, offset);
 868       break;
 869
 870     case DW_CFA_register:
 871       reg1 = cfi_parse_reg ();
 872       cfi_parse_separator ();
 873       reg2 = cfi_parse_reg ();
 874       cfi_add_CFA_register (reg1, reg2);
 875       break;
 876
 877     case DW_CFA_def_cfa_register:
 878       reg1 = cfi_parse_reg ();
 879       cfi_add_CFA_def_cfa_register (reg1);
 880       break;
 881
 882     case DW_CFA_def_cfa_offset:
 883       offset = cfi_parse_const ();
 884       cfi_add_CFA_def_cfa_offset (offset);
 885       break;
 886
 887     case CFI_adjust_cfa_offset:
 888       offset = cfi_parse_const ();
 889       cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset
 890                                   + offset);
 891       break;
 892
 893     case DW_CFA_restore:
 894       for (;;)
 895         {
 896           reg1 = cfi_parse_reg ();
 897           cfi_add_CFA_restore (reg1);
 898           SKIP_WHITESPACE ();
 899           if (*input_line_pointer != ',')
 900             break;
 901           ++input_line_pointer;
 902         }
 903       break;
 904
 905     case DW_CFA_undefined:
 906       for (;;)
 907         {
 908           reg1 = cfi_parse_reg ();
 909           cfi_add_CFA_undefined (reg1);
 910           SKIP_WHITESPACE ();
 911           if (*input_line_pointer != ',')
 912             break;
 913           ++input_line_pointer;
 914         }
 915       break;
 916
 917     case DW_CFA_same_value:
 918       reg1 = cfi_parse_reg ();
 919       cfi_add_CFA_same_value (reg1);
 920       break;
 921
 922     case CFI_return_column:
 923       reg1 = cfi_parse_reg ();
 924       cfi_set_return_column (reg1);
 925       break;
 926
 927     case DW_CFA_remember_state:
 928       cfi_add_CFA_remember_state ();
 929       break;
 930
 931     case DW_CFA_restore_state:
 932       cfi_add_CFA_restore_state ();
 933       break;
 934
 935     case DW_CFA_GNU_window_save:
 936       cfi_add_CFA_insn (DW_CFA_GNU_window_save);
 937       break;
 938
 939     case CFI_signal_frame:
 940       frchain_now->frch_cfi_data->cur_fde_data->signal_frame = 1;
 941       break;
 942
 943     default:
 944       abort ();
 945     }
 946
 947   demand_empty_rest_of_line ();
 948 }
 949
 950 static void
 951 dot_cfi_escape (int ignored ATTRIBUTE_UNUSED)
 952 {
 953   struct cfi_escape_data *head, **tail, *e;
 954   struct cfi_insn_data *insn;
 955
 956   if (frchain_now->frch_cfi_data == NULL)
 957     {
 958       as_bad (_("CFI instruction used without previous .cfi_startproc"));
 959       ignore_rest_of_line ();
 960       return;
 961     }
 962
 963   /* If the last address was not at the current PC, advance to current.  */
 964   if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
 965       || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
 966           != frag_now_fix ()))
 967     cfi_add_advance_loc (symbol_temp_new_now ());
 968
 969   tail = &head;
 970   do
 971     {
 972       e = XNEW (struct cfi_escape_data);
 973       do_parse_cons_expression (&e->exp, 1);
 974       *tail = e;
 975       tail = &e->next;
 976     }
 977   while (*input_line_pointer++ == ',');
 978   *tail = NULL;
 979
 980   insn = alloc_cfi_insn_data ();
 981   insn->insn = CFI_escape;
 982   insn->u.esc = head;
 983
 984   --input_line_pointer;
 985   demand_empty_rest_of_line ();
 986 }
 987
 988 static void
 989 dot_cfi_personality (int ignored ATTRIBUTE_UNUSED)
 990 {
 991   struct fde_entry *fde;
 992   offsetT encoding;
 993
 994   if (frchain_now->frch_cfi_data == NULL)
 995     {
 996       as_bad (_("CFI instruction used without previous .cfi_startproc"));
 997       ignore_rest_of_line ();
 998       return;
 999     }
1000
1001   fde = frchain_now->frch_cfi_data->cur_fde_data;
1002   encoding = cfi_parse_const ();
1003   if (encoding == DW_EH_PE_omit)
1004     {
1005       demand_empty_rest_of_line ();
1006       fde->per_encoding = encoding;
1007       return;
1008     }
1009
1010   if ((encoding & 0xff) != encoding
1011       || ((((encoding & 0x70) != 0
1012 #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
1013             && (encoding & 0x70) != DW_EH_PE_pcrel
1014 #endif
1015             )
1016            /* leb128 can be handled, but does something actually need it?  */
1017            || (encoding & 7) == DW_EH_PE_uleb128
1018            || (encoding & 7) > DW_EH_PE_udata8)
1019           && tc_cfi_reloc_for_encoding (encoding) == BFD_RELOC_NONE))
1020     {
1021       as_bad (_("invalid or unsupported encoding in .cfi_personality"));
1022       ignore_rest_of_line ();
1023       return;
1024     }
1025
1026   if (*input_line_pointer++ != ',')
1027     {
1028       as_bad (_(".cfi_personality requires encoding and symbol arguments"));
1029       ignore_rest_of_line ();
1030       return;
1031     }
1032
1033   expression_and_evaluate (&fde->personality);
1034   switch (fde->personality.X_op)
1035     {
1036     case O_symbol:
1037       break;
1038     case O_constant:
1039       if ((encoding & 0x70) == DW_EH_PE_pcrel)
1040         encoding = DW_EH_PE_omit;
1041       break;
1042     default:
1043       encoding = DW_EH_PE_omit;
1044       break;
1045     }
1046
1047   fde->per_encoding = encoding;
1048
1049   if (encoding == DW_EH_PE_omit)
1050     {
1051       as_bad (_("wrong second argument to .cfi_personality"));
1052       ignore_rest_of_line ();
1053       return;
1054     }
1055
1056   demand_empty_rest_of_line ();
1057 }
1058
1059 static void
1060 dot_cfi_lsda (int ignored ATTRIBUTE_UNUSED)
1061 {
1062   struct fde_entry *fde;
1063   offsetT encoding;
1064
1065   if (frchain_now->frch_cfi_data == NULL)
1066     {
1067       as_bad (_("CFI instruction used without previous .cfi_startproc"));
1068       ignore_rest_of_line ();
1069       return;
1070     }
1071
1072   fde = frchain_now->frch_cfi_data->cur_fde_data;
1073   encoding = cfi_parse_const ();
1074   if (encoding == DW_EH_PE_omit)
1075     {
1076       demand_empty_rest_of_line ();
1077       fde->lsda_encoding = encoding;
1078       return;
1079     }
1080
1081   if ((encoding & 0xff) != encoding
1082       || ((((encoding & 0x70) != 0
1083 #if CFI_DIFF_LSDA_OK || defined tc_cfi_emit_pcrel_expr
1084             && (encoding & 0x70) != DW_EH_PE_pcrel
1085 #endif
1086             )
1087            /* leb128 can be handled, but does something actually need it?  */
1088            || (encoding & 7) == DW_EH_PE_uleb128
1089            || (encoding & 7) > DW_EH_PE_udata8)
1090           && tc_cfi_reloc_for_encoding (encoding) == BFD_RELOC_NONE))
1091     {
1092       as_bad (_("invalid or unsupported encoding in .cfi_lsda"));
1093       ignore_rest_of_line ();
1094       return;
1095     }
1096
1097   if (*input_line_pointer++ != ',')
1098     {
1099       as_bad (_(".cfi_lsda requires encoding and symbol arguments"));
1100       ignore_rest_of_line ();
1101       return;
1102     }
1103
1104   fde->lsda_encoding = encoding;
1105
1106   expression_and_evaluate (&fde->lsda);
1107   switch (fde->lsda.X_op)
1108     {
1109     case O_symbol:
1110       break;
1111     case O_constant:
1112       if ((encoding & 0x70) == DW_EH_PE_pcrel)
1113         encoding = DW_EH_PE_omit;
1114       break;
1115     default:
1116       encoding = DW_EH_PE_omit;
1117       break;
1118     }
1119
1120   fde->lsda_encoding = encoding;
1121
1122   if (encoding == DW_EH_PE_omit)
1123     {
1124       as_bad (_("wrong second argument to .cfi_lsda"));
1125       ignore_rest_of_line ();
1126       return;
1127     }
1128
1129   demand_empty_rest_of_line ();
1130 }
1131
1132 static void
1133 dot_cfi_val_encoded_addr (int ignored ATTRIBUTE_UNUSED)
1134 {
1135   struct cfi_insn_data *insn_ptr;
1136   offsetT encoding;
1137
1138   if (frchain_now->frch_cfi_data == NULL)
1139     {
1140       as_bad (_("CFI instruction used without previous .cfi_startproc"));
1141       ignore_rest_of_line ();
1142       return;
1143     }
1144
1145   /* If the last address was not at the current PC, advance to current.  */
1146   if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
1147       || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
1148           != frag_now_fix ()))
1149     cfi_add_advance_loc (symbol_temp_new_now ());
1150
1151   insn_ptr = alloc_cfi_insn_data ();
1152   insn_ptr->insn = CFI_val_encoded_addr;
1153
1154   insn_ptr->u.ea.reg = cfi_parse_reg ();
1155
1156   cfi_parse_separator ();
1157   encoding = cfi_parse_const ();
1158   if ((encoding & 0xff) != encoding
1159       || ((encoding & 0x70) != 0
1160 #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
1161           && (encoding & 0x70) != DW_EH_PE_pcrel
1162 #endif
1163           )
1164       /* leb128 can be handled, but does something actually need it?  */
1165       || (encoding & 7) == DW_EH_PE_uleb128
1166       || (encoding & 7) > DW_EH_PE_udata8)
1167     {
1168       as_bad (_("invalid or unsupported encoding in .cfi_lsda"));
1169       encoding = DW_EH_PE_omit;
1170     }
1171
1172   cfi_parse_separator ();
1173   expression_and_evaluate (&insn_ptr->u.ea.exp);
1174   switch (insn_ptr->u.ea.exp.X_op)
1175     {
1176     case O_symbol:
1177       break;
1178     case O_constant:
1179       if ((encoding & 0x70) != DW_EH_PE_pcrel)
1180         break;
1181       /* Fall through.  */
1182     default:
1183       encoding = DW_EH_PE_omit;
1184       break;
1185     }
1186
1187   insn_ptr->u.ea.encoding = encoding;
1188   if (encoding == DW_EH_PE_omit)
1189     {
1190       as_bad (_("wrong third argument to .cfi_val_encoded_addr"));
1191       ignore_rest_of_line ();
1192       return;
1193     }
1194
1195   demand_empty_rest_of_line ();
1196 }
1197
1198 static void
1199 dot_cfi_label (int ignored ATTRIBUTE_UNUSED)
1200 {
1201   char *name = read_symbol_name ();
1202
1203   if (name == NULL)
1204     return;
1205
1206   /* If the last address was not at the current PC, advance to current.  */
1207   if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now
1208       || (S_GET_VALUE (frchain_now->frch_cfi_data->last_address)
1209           != frag_now_fix ()))
1210     cfi_add_advance_loc (symbol_temp_new_now ());
1211
1212   cfi_add_label (name);
1213   free (name);
1214
1215   demand_empty_rest_of_line ();
1216 }
1217
1218 static void
1219 dot_cfi_sections (int ignored ATTRIBUTE_UNUSED)
1220 {
1221   int sections = 0;
1222
1223   SKIP_WHITESPACE ();
1224   if (is_name_beginner (*input_line_pointer) || *input_line_pointer == '"')
1225     while (1)
1226       {
1227         char * saved_ilp;
1228         char *name, c;
1229
1230         saved_ilp = input_line_pointer;
1231         c = get_symbol_name (& name);
1232
1233         if (strncmp (name, ".eh_frame", sizeof ".eh_frame") == 0
1234             && name[9] != '_')
1235           sections |= CFI_EMIT_eh_frame;
1236         else if (strncmp (name, ".debug_frame", sizeof ".debug_frame") == 0)
1237           sections |= CFI_EMIT_debug_frame;
1238 #if SUPPORT_COMPACT_EH
1239         else if (strncmp (name, ".eh_frame_entry",
1240                           sizeof ".eh_frame_entry") == 0)
1241           {
1242             compact_eh = TRUE;
1243             sections |= CFI_EMIT_eh_frame_compact;
1244           }
1245 #endif
1246 #ifdef tc_cfi_section_name
1247         else if (strcmp (name, tc_cfi_section_name) == 0)
1248           sections |= CFI_EMIT_target;
1249 #endif
1250         else
1251           {
1252             *input_line_pointer = c;
1253             input_line_pointer = saved_ilp;
1254             break;
1255           }
1256
1257         *input_line_pointer = c;
1258         SKIP_WHITESPACE_AFTER_NAME ();
1259         if (*input_line_pointer == ',')
1260           {
1261             name = input_line_pointer++;
1262             SKIP_WHITESPACE ();
1263             if (!is_name_beginner (*input_line_pointer)
1264                 && *input_line_pointer != '"')
1265               {
1266                 input_line_pointer = name;
1267                 break;
1268               }
1269           }
1270         else if (is_name_beginner (*input_line_pointer)
1271                  || *input_line_pointer == '"')
1272           break;
1273       }
1274
1275   demand_empty_rest_of_line ();
1276   if (cfi_sections_set
1277       && (sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact))
1278       && ((cfi_sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact))
1279           != (sections & (CFI_EMIT_eh_frame | CFI_EMIT_eh_frame_compact))))
1280     as_bad (_("inconsistent uses of .cfi_sections"));
1281   cfi_sections = sections;
1282 }
1283
1284 static void
1285 dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED)
1286 {
1287   int simple = 0;
1288
1289   if (frchain_now->frch_cfi_data != NULL)
1290     {
1291       as_bad (_("previous CFI entry not closed (missing .cfi_endproc)"));
1292       ignore_rest_of_line ();
1293       return;
1294     }
1295
1296   cfi_new_fde (symbol_temp_new_now ());
1297
1298   SKIP_WHITESPACE ();
1299   if (is_name_beginner (*input_line_pointer) || *input_line_pointer == '"')
1300     {
1301       char * saved_ilp = input_line_pointer;
1302       char *name, c;
1303
1304       c = get_symbol_name (& name);
1305
1306       if (strcmp (name, "simple") == 0)
1307         {
1308           simple = 1;
1309           restore_line_pointer (c);
1310         }
1311       else
1312         input_line_pointer = saved_ilp;
1313     }
1314   demand_empty_rest_of_line ();
1315
1316   cfi_sections_set = TRUE;
1317   all_cfi_sections |= cfi_sections;
1318   cfi_set_sections ();
1319   frchain_now->frch_cfi_data->cur_cfa_offset = 0;
1320   if (!simple)
1321     tc_cfi_frame_initial_instructions ();
1322
1323   if ((cfi_sections & CFI_EMIT_target) != 0)
1324     tc_cfi_startproc ();
1325 }
1326
1327 static void
1328 dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED)
1329 {
1330   if (frchain_now->frch_cfi_data == NULL)
1331     {
1332       as_bad (_(".cfi_endproc without corresponding .cfi_startproc"));
1333       ignore_rest_of_line ();
1334       return;
1335     }
1336
1337   last_fde = frchain_now->frch_cfi_data->cur_fde_data;
1338
1339   cfi_end_fde (symbol_temp_new_now ());
1340
1341   demand_empty_rest_of_line ();
1342
1343   cfi_sections_set = TRUE;
1344   if ((cfi_sections & CFI_EMIT_target) != 0)
1345     tc_cfi_endproc (last_fde);
1346 }
1347
1348 static segT
1349 get_cfi_seg (segT cseg, const char *base, flagword flags, int align)
1350 {
1351   /* Exclude .debug_frame sections for Compact EH.  */
1352   if (SUPPORT_FRAME_LINKONCE || ((flags & SEC_DEBUGGING) == 0 && compact_eh))
1353     {
1354       struct dwcfi_seg_list *l;
1355
1356       l = dwcfi_hash_find_or_make (cseg, base, flags);
1357
1358       cseg = l->seg;
1359       subseg_set (cseg, l->subseg);
1360     }
1361   else
1362     {
1363       cseg = subseg_new (base, 0);
1364       bfd_set_section_flags (stdoutput, cseg, flags);
1365     }
1366   record_alignment (cseg, align);
1367   return cseg;
1368 }
1369
1370 #if SUPPORT_COMPACT_EH
1371 static void
1372 dot_cfi_personality_id (int ignored ATTRIBUTE_UNUSED)
1373 {
1374   struct fde_entry *fde;
1375
1376   if (frchain_now->frch_cfi_data == NULL)
1377     {
1378       as_bad (_("CFI instruction used without previous .cfi_startproc"));
1379       ignore_rest_of_line ();
1380       return;
1381     }
1382
1383   fde = frchain_now->frch_cfi_data->cur_fde_data;
1384   fde->personality_id = cfi_parse_const ();
1385   demand_empty_rest_of_line ();
1386
1387   if (fde->personality_id == 0 || fde->personality_id > 3)
1388     {
1389       as_bad (_("wrong argument to .cfi_personality_id"));
1390       return;
1391     }
1392 }
1393
1394 static void
1395 dot_cfi_fde_data (int ignored ATTRIBUTE_UNUSED)
1396 {
1397   if (frchain_now->frch_cfi_data == NULL)
1398     {
1399       as_bad (_(".cfi_fde_data without corresponding .cfi_startproc"));
1400       ignore_rest_of_line ();
1401       return;
1402     }
1403
1404   last_fde = frchain_now->frch_cfi_data->cur_fde_data;
1405
1406   cfi_sections_set = TRUE;
1407   if ((cfi_sections & CFI_EMIT_target) != 0
1408       || (cfi_sections & CFI_EMIT_eh_frame_compact) != 0)
1409     {
1410       struct cfi_escape_data *head, **tail, *e;
1411       int num_ops = 0;
1412
1413       tail = &head;
1414       if (!is_it_end_of_statement ())
1415         {
1416           num_ops = 0;
1417           do
1418             {
1419               e = XNEW (struct cfi_escape_data);
1420               do_parse_cons_expression (&e->exp, 1);
1421               *tail = e;
1422               tail = &e->next;
1423               num_ops++;
1424             }
1425           while (*input_line_pointer++ == ',');
1426           --input_line_pointer;
1427         }
1428       *tail = NULL;
1429
1430       if (last_fde->lsda_encoding != DW_EH_PE_omit)
1431         last_fde->eh_header_type = EH_COMPACT_HAS_LSDA;
1432       else if (num_ops <= 3 && last_fde->per_encoding == DW_EH_PE_omit)
1433         last_fde->eh_header_type = EH_COMPACT_INLINE;
1434       else
1435         last_fde->eh_header_type = EH_COMPACT_OUTLINE;
1436
1437       if (last_fde->eh_header_type == EH_COMPACT_INLINE)
1438         num_ops = 3;
1439
1440       last_fde->eh_data_size = num_ops;
1441       last_fde->eh_data =  XNEWVEC (bfd_byte, num_ops);
1442       num_ops = 0;
1443       while (head)
1444         {
1445           e = head;
1446           head = e->next;
1447           last_fde->eh_data[num_ops++] = e->exp.X_add_number;
1448           free (e);
1449         }
1450       if (last_fde->eh_header_type == EH_COMPACT_INLINE)
1451         while (num_ops < 3)
1452           last_fde->eh_data[num_ops++] = tc_compact_eh_opcode_stop;
1453     }
1454
1455   demand_empty_rest_of_line ();
1456 }
1457
1458 /* Function to emit the compact unwinding opcodes stored in the
1459    fde's eh_data field.  The end of the opcode data will be
1460    padded to the value in align.  */
1461
1462 static void
1463 output_compact_unwind_data (struct fde_entry *fde, int align)
1464 {
1465   int data_size = fde->eh_data_size + 2;
1466   int align_padding;
1467   int amask;
1468   char *p;
1469
1470   fde->eh_loc = symbol_temp_new_now ();
1471
1472   p = frag_more (1);
1473   if (fde->personality_id != 0)
1474     *p = fde->personality_id;
1475   else if (fde->per_encoding != DW_EH_PE_omit)
1476     {
1477       *p = 0;
1478       emit_expr_encoded (&fde->personality, fde->per_encoding, FALSE);
1479       data_size += encoding_size (fde->per_encoding);
1480     }
1481   else
1482     *p = 1;
1483
1484   amask = (1 << align) - 1;
1485   align_padding = ((data_size + amask) & ~amask) - data_size;
1486
1487   p = frag_more (fde->eh_data_size + 1 + align_padding);
1488   memcpy (p, fde->eh_data, fde->eh_data_size);
1489   p += fde->eh_data_size;
1490
1491   while (align_padding-- > 0)
1492     *(p++) = tc_compact_eh_opcode_pad;
1493
1494   *(p++) = tc_compact_eh_opcode_stop;
1495   fde->eh_header_type = EH_COMPACT_OUTLINE_DONE;
1496 }
1497
1498 /* Handle the .cfi_inline_lsda directive.  */
1499 static void
1500 dot_cfi_inline_lsda (int ignored ATTRIBUTE_UNUSED)
1501 {
1502   segT ccseg;
1503   int align;
1504   long max_alignment = 28;
1505
1506   if (!last_fde)
1507     {
1508       as_bad (_("unexpected .cfi_inline_lsda"));
1509       ignore_rest_of_line ();
1510       return;
1511     }
1512
1513   if ((last_fde->sections & CFI_EMIT_eh_frame_compact) == 0)
1514     {
1515       as_bad (_(".cfi_inline_lsda not valid for this frame"));
1516       ignore_rest_of_line ();
1517       return;
1518     }
1519
1520   if (last_fde->eh_header_type != EH_COMPACT_UNKNOWN
1521       && last_fde->eh_header_type != EH_COMPACT_HAS_LSDA)
1522     {
1523       as_bad (_(".cfi_inline_lsda seen for frame without .cfi_lsda"));
1524       ignore_rest_of_line ();
1525       return;
1526     }
1527
1528 #ifdef md_flush_pending_output
1529   md_flush_pending_output ();
1530 #endif
1531
1532   align = get_absolute_expression ();
1533   if (align > max_alignment)
1534     {
1535       align = max_alignment;
1536       as_bad (_("Alignment too large: %d. assumed."), align);
1537     }
1538   else if (align < 0)
1539     {
1540       as_warn (_("Alignment negative: 0 assumed."));
1541       align = 0;
1542     }
1543
1544   demand_empty_rest_of_line ();
1545   ccseg = CUR_SEG (last_fde);
1546
1547   /* Open .gnu_extab section.  */
1548   get_cfi_seg (ccseg, ".gnu_extab",
1549                (SEC_ALLOC | SEC_LOAD | SEC_DATA
1550                 | DWARF2_EH_FRAME_READ_ONLY),
1551                1);
1552
1553   frag_align (align, 0, 0);
1554   record_alignment (now_seg, align);
1555   if (last_fde->eh_header_type == EH_COMPACT_HAS_LSDA)
1556     output_compact_unwind_data (last_fde, align);
1557
1558   last_fde = NULL;
1559
1560   return;
1561 }
1562 #else /* !SUPPORT_COMPACT_EH */
1563 static void
1564 dot_cfi_inline_lsda (int ignored ATTRIBUTE_UNUSED)
1565 {
1566   as_bad (_(".cfi_inline_lsda is not supported for this target"));
1567   ignore_rest_of_line ();
1568 }
1569
1570 static void
1571 dot_cfi_fde_data (int ignored ATTRIBUTE_UNUSED)
1572 {
1573   as_bad (_(".cfi_fde_data is not supported for this target"));
1574   ignore_rest_of_line ();
1575 }
1576
1577 static void
1578 dot_cfi_personality_id (int ignored ATTRIBUTE_UNUSED)
1579 {
1580   as_bad (_(".cfi_personality_id is not supported for this target"));
1581   ignore_rest_of_line ();
1582 }
1583 #endif
1584 \f
1585 static void
1586 output_cfi_insn (struct cfi_insn_data *insn)
1587 {
1588   offsetT offset;
1589   unsigned int regno;
1590
1591   switch (insn->insn)
1592     {
1593     case DW_CFA_advance_loc:
1594       {
1595         symbolS *from = insn->u.ll.lab1;
1596         symbolS *to = insn->u.ll.lab2;
1597
1598         if (symbol_get_frag (to) == symbol_get_frag (from))
1599           {
1600             addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from);
1601             addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH;
1602
1603             if (scaled <= 0x3F)
1604               out_one (DW_CFA_advance_loc + scaled);
1605             else if (scaled <= 0xFF)
1606               {
1607                 out_one (DW_CFA_advance_loc1);
1608                 out_one (scaled);
1609               }
1610             else if (scaled <= 0xFFFF)
1611               {
1612                 out_one (DW_CFA_advance_loc2);
1613                 out_two (scaled);
1614               }
1615             else
1616               {
1617                 out_one (DW_CFA_advance_loc4);
1618                 out_four (scaled);
1619               }
1620           }
1621         else
1622           {
1623             expressionS exp;
1624
1625             exp.X_op = O_subtract;
1626             exp.X_add_symbol = to;
1627             exp.X_op_symbol = from;
1628             exp.X_add_number = 0;
1629
1630             /* The code in ehopt.c expects that one byte of the encoding
1631                is already allocated to the frag.  This comes from the way
1632                that it scans the .eh_frame section looking first for the
1633                .byte DW_CFA_advance_loc4.  */
1634             *frag_more (1) = DW_CFA_advance_loc4;
1635
1636             frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3,
1637                       make_expr_symbol (&exp), frag_now_fix () - 1,
1638                       (char *) frag_now);
1639           }
1640       }
1641       break;
1642
1643     case DW_CFA_def_cfa:
1644       offset = insn->u.ri.offset;
1645       if (offset < 0)
1646         {
1647           out_one (DW_CFA_def_cfa_sf);
1648           out_uleb128 (insn->u.ri.reg);
1649           out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT);
1650         }
1651       else
1652         {
1653           out_one (DW_CFA_def_cfa);
1654           out_uleb128 (insn->u.ri.reg);
1655           out_uleb128 (offset);
1656         }
1657       break;
1658
1659     case DW_CFA_def_cfa_register:
1660     case DW_CFA_undefined:
1661     case DW_CFA_same_value:
1662       out_one (insn->insn);
1663       out_uleb128 (insn->u.r);
1664       break;
1665
1666     case DW_CFA_def_cfa_offset:
1667       offset = insn->u.i;
1668       if (offset < 0)
1669         {
1670           out_one (DW_CFA_def_cfa_offset_sf);
1671           out_sleb128 (offset / DWARF2_CIE_DATA_ALIGNMENT);
1672         }
1673       else
1674         {
1675           out_one (DW_CFA_def_cfa_offset);
1676           out_uleb128 (offset);
1677         }
1678       break;
1679
1680     case DW_CFA_restore:
1681       regno = insn->u.r;
1682       if (regno <= 0x3F)
1683         {
1684           out_one (DW_CFA_restore + regno);
1685         }
1686       else
1687         {
1688           out_one (DW_CFA_restore_extended);
1689           out_uleb128 (regno);
1690         }
1691       break;
1692
1693     case DW_CFA_offset:
1694       regno = insn->u.ri.reg;
1695       offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT;
1696       if (offset < 0)
1697         {
1698           out_one (DW_CFA_offset_extended_sf);
1699           out_uleb128 (regno);
1700           out_sleb128 (offset);
1701         }
1702       else if (regno <= 0x3F)
1703         {
1704           out_one (DW_CFA_offset + regno);
1705           out_uleb128 (offset);
1706         }
1707       else
1708         {
1709           out_one (DW_CFA_offset_extended);
1710           out_uleb128 (regno);
1711           out_uleb128 (offset);
1712         }
1713       break;
1714
1715     case DW_CFA_val_offset:
1716       regno = insn->u.ri.reg;
1717       offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT;
1718       if (offset < 0)
1719         {
1720           out_one (DW_CFA_val_offset_sf);
1721           out_uleb128 (regno);
1722           out_sleb128 (offset);
1723         }
1724       else
1725         {
1726           out_one (DW_CFA_val_offset);
1727           out_uleb128 (regno);
1728           out_uleb128 (offset);
1729         }
1730       break;
1731
1732     case DW_CFA_register:
1733       out_one (DW_CFA_register);
1734       out_uleb128 (insn->u.rr.reg1);
1735       out_uleb128 (insn->u.rr.reg2);
1736       break;
1737
1738     case DW_CFA_remember_state:
1739     case DW_CFA_restore_state:
1740       out_one (insn->insn);
1741       break;
1742
1743     case DW_CFA_GNU_window_save:
1744       out_one (DW_CFA_GNU_window_save);
1745       break;
1746
1747     case CFI_escape:
1748       {
1749         struct cfi_escape_data *e;
1750         for (e = insn->u.esc; e ; e = e->next)
1751           emit_expr (&e->exp, 1);
1752         break;
1753       }
1754
1755     case CFI_val_encoded_addr:
1756       {
1757         unsigned encoding = insn->u.ea.encoding;
1758         offsetT enc_size;
1759
1760         if (encoding == DW_EH_PE_omit)
1761           break;
1762         out_one (DW_CFA_val_expression);
1763         out_uleb128 (insn->u.ea.reg);
1764
1765         switch (encoding & 0x7)
1766           {
1767           case DW_EH_PE_absptr:
1768             enc_size = DWARF2_ADDR_SIZE (stdoutput);
1769             break;
1770           case DW_EH_PE_udata2:
1771             enc_size = 2;
1772             break;
1773           case DW_EH_PE_udata4:
1774             enc_size = 4;
1775             break;
1776           case DW_EH_PE_udata8:
1777             enc_size = 8;
1778             break;
1779           default:
1780             abort ();
1781           }
1782
1783         /* If the user has requested absolute encoding,
1784            then use the smaller DW_OP_addr encoding.  */
1785         if (insn->u.ea.encoding == DW_EH_PE_absptr)
1786           {
1787             out_uleb128 (1 + enc_size);
1788             out_one (DW_OP_addr);
1789           }
1790         else
1791           {
1792             out_uleb128 (1 + 1 + enc_size);
1793             out_one (DW_OP_GNU_encoded_addr);
1794             out_one (encoding);
1795
1796             if ((encoding & 0x70) == DW_EH_PE_pcrel)
1797               {
1798 #if CFI_DIFF_EXPR_OK
1799                 insn->u.ea.exp.X_op = O_subtract;
1800                 insn->u.ea.exp.X_op_symbol = symbol_temp_new_now ();
1801 #elif defined (tc_cfi_emit_pcrel_expr)
1802                 tc_cfi_emit_pcrel_expr (&insn->u.ea.exp, enc_size);
1803                 break;
1804 #else
1805                 abort ();
1806 #endif
1807               }
1808           }
1809         emit_expr (&insn->u.ea.exp, enc_size);
1810       }
1811       break;
1812
1813     case CFI_label:
1814       colon (insn->u.sym_name);
1815       break;
1816
1817     default:
1818       abort ();
1819     }
1820 }
1821
1822 static void
1823 output_cie (struct cie_entry *cie, bfd_boolean eh_frame, int align)
1824 {
1825   symbolS *after_size_address, *end_address;
1826   expressionS exp;
1827   struct cfi_insn_data *i;
1828   offsetT augmentation_size;
1829   int enc;
1830   enum dwarf2_format fmt = DWARF2_FORMAT (now_seg);
1831
1832   cie->start_address = symbol_temp_new_now ();
1833   after_size_address = symbol_temp_make ();
1834   end_address = symbol_temp_make ();
1835
1836   exp.X_op = O_subtract;
1837   exp.X_add_symbol = end_address;
1838   exp.X_op_symbol = after_size_address;
1839   exp.X_add_number = 0;
1840
1841   if (eh_frame || fmt == dwarf2_format_32bit)
1842     emit_expr (&exp, 4);                        /* Length.  */
1843   else
1844     {
1845       if (fmt == dwarf2_format_64bit)
1846         out_four (-1);
1847       emit_expr (&exp, 8);                      /* Length.  */
1848     }
1849   symbol_set_value_now (after_size_address);
1850   if (eh_frame)
1851     out_four (0);                               /* CIE id.  */
1852   else
1853     {
1854       out_four (-1);                            /* CIE id.  */
1855       if (fmt != dwarf2_format_32bit)
1856         out_four (-1);
1857     }
1858   out_one (DW_CIE_VERSION);                     /* Version.  */
1859   if (eh_frame)
1860     {
1861       out_one ('z');                            /* Augmentation.  */
1862       if (cie->per_encoding != DW_EH_PE_omit)
1863         out_one ('P');
1864       if (cie->lsda_encoding != DW_EH_PE_omit)
1865         out_one ('L');
1866       out_one ('R');
1867     }
1868   if (cie->signal_frame)
1869     out_one ('S');
1870   out_one (0);
1871   out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH);    /* Code alignment.  */
1872   out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT);      /* Data alignment.  */
1873   if (DW_CIE_VERSION == 1)                      /* Return column.  */
1874     out_one (cie->return_column);
1875   else
1876     out_uleb128 (cie->return_column);
1877   if (eh_frame)
1878     {
1879       augmentation_size = 1 + (cie->lsda_encoding != DW_EH_PE_omit);
1880       if (cie->per_encoding != DW_EH_PE_omit)
1881         augmentation_size += 1 + encoding_size (cie->per_encoding);
1882       out_uleb128 (augmentation_size);          /* Augmentation size.  */
1883
1884       emit_expr_encoded (&cie->personality, cie->per_encoding, TRUE);
1885
1886       if (cie->lsda_encoding != DW_EH_PE_omit)
1887         out_one (cie->lsda_encoding);
1888     }
1889
1890   switch (DWARF2_FDE_RELOC_SIZE)
1891     {
1892     case 2:
1893       enc = DW_EH_PE_sdata2;
1894       break;
1895     case 4:
1896       enc = DW_EH_PE_sdata4;
1897       break;
1898     case 8:
1899       enc = DW_EH_PE_sdata8;
1900       break;
1901     default:
1902       abort ();
1903     }
1904 #if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr
1905   enc |= DW_EH_PE_pcrel;
1906 #endif
1907 #ifdef DWARF2_FDE_RELOC_ENCODING
1908   /* Allow target to override encoding.  */
1909   enc = DWARF2_FDE_RELOC_ENCODING (enc);
1910 #endif
1911   cie->fde_encoding = enc;
1912   if (eh_frame)
1913     out_one (enc);
1914
1915   if (cie->first)
1916     {
1917       for (i = cie->first; i != cie->last; i = i->next)
1918         {
1919           if (CUR_SEG (i) != CUR_SEG (cie))
1920             continue;
1921           output_cfi_insn (i);
1922         }
1923     }
1924
1925   frag_align (align, DW_CFA_nop, 0);
1926   symbol_set_value_now (end_address);
1927 }
1928
1929 static void
1930 output_fde (struct fde_entry *fde, struct cie_entry *cie,
1931             bfd_boolean eh_frame, struct cfi_insn_data *first,
1932             int align)
1933 {
1934   symbolS *after_size_address, *end_address;
1935   expressionS exp;
1936   offsetT augmentation_size;
1937   enum dwarf2_format fmt = DWARF2_FORMAT (now_seg);
1938   unsigned int offset_size;
1939   unsigned int addr_size;
1940
1941   after_size_address = symbol_temp_make ();
1942   end_address = symbol_temp_make ();
1943
1944   exp.X_op = O_subtract;
1945   exp.X_add_symbol = end_address;
1946   exp.X_op_symbol = after_size_address;
1947   exp.X_add_number = 0;
1948   if (eh_frame || fmt == dwarf2_format_32bit)
1949     offset_size = 4;
1950   else
1951     {
1952       if (fmt == dwarf2_format_64bit)
1953         out_four (-1);
1954       offset_size = 8;
1955     }
1956   emit_expr (&exp, offset_size);                /* Length.  */
1957   symbol_set_value_now (after_size_address);
1958
1959   if (eh_frame)
1960     {
1961       exp.X_op = O_subtract;
1962       exp.X_add_symbol = after_size_address;
1963       exp.X_op_symbol = cie->start_address;
1964       exp.X_add_number = 0;
1965       emit_expr (&exp, offset_size);            /* CIE offset.  */
1966     }
1967   else
1968     {
1969       TC_DWARF2_EMIT_OFFSET (cie->start_address, offset_size);
1970     }
1971
1972   exp.X_op = O_symbol;
1973   if (eh_frame)
1974     {
1975       bfd_reloc_code_real_type code
1976         = tc_cfi_reloc_for_encoding (cie->fde_encoding);
1977       addr_size = DWARF2_FDE_RELOC_SIZE;
1978       if (code != BFD_RELOC_NONE)
1979         {
1980           reloc_howto_type *howto = bfd_reloc_type_lookup (stdoutput, code);
1981           char *p = frag_more (addr_size);
1982           gas_assert (addr_size == howto->bitsize / 8);
1983           md_number_to_chars (p, 0, addr_size);
1984           fix_new (frag_now, p - frag_now->fr_literal, addr_size,
1985                    fde->start_address, 0, howto->pc_relative, code);
1986         }
1987       else
1988         {
1989           exp.X_op = O_subtract;
1990           exp.X_add_number = 0;
1991 #if CFI_DIFF_EXPR_OK
1992           exp.X_add_symbol = fde->start_address;
1993           exp.X_op_symbol = symbol_temp_new_now ();
1994           emit_expr (&exp, addr_size);  /* Code offset.  */
1995 #else
1996           exp.X_op = O_symbol;
1997           exp.X_add_symbol = fde->start_address;
1998
1999 #if defined(tc_cfi_emit_pcrel_expr)
2000           tc_cfi_emit_pcrel_expr (&exp, addr_size);      /* Code offset.  */
2001 #else
2002           emit_expr (&exp, addr_size);  /* Code offset.  */
2003 #endif
2004 #endif
2005         }
2006     }
2007   else
2008     {
2009       exp.X_add_number = 0;
2010       exp.X_add_symbol = fde->start_address;
2011       addr_size = DWARF2_ADDR_SIZE (stdoutput);
2012       emit_expr (&exp, addr_size);
2013     }
2014
2015   exp.X_op = O_subtract;
2016   exp.X_add_symbol = fde->end_address;
2017   exp.X_op_symbol = fde->start_address;         /* Code length.  */
2018   exp.X_add_number = 0;
2019   emit_expr (&exp, addr_size);
2020
2021   augmentation_size = encoding_size (fde->lsda_encoding);
2022   if (eh_frame)
2023     out_uleb128 (augmentation_size);            /* Augmentation size.  */
2024
2025   emit_expr_encoded (&fde->lsda, cie->lsda_encoding, FALSE);
2026
2027   for (; first; first = first->next)
2028     if (CUR_SEG (first) == CUR_SEG (fde))
2029       output_cfi_insn (first);
2030
2031   frag_align (align, DW_CFA_nop, 0);
2032   symbol_set_value_now (end_address);
2033 }
2034
2035 static struct cie_entry *
2036 select_cie_for_fde (struct fde_entry *fde, bfd_boolean eh_frame,
2037                     struct cfi_insn_data **pfirst, int align)
2038 {
2039   struct cfi_insn_data *i, *j;
2040   struct cie_entry *cie;
2041
2042   for (cie = cie_root; cie; cie = cie->next)
2043     {
2044       if (CUR_SEG (cie) != CUR_SEG (fde))
2045         continue;
2046       if (cie->return_column != fde->return_column
2047           || cie->signal_frame != fde->signal_frame
2048           || cie->per_encoding != fde->per_encoding
2049           || cie->lsda_encoding != fde->lsda_encoding)
2050         continue;
2051       if (cie->per_encoding != DW_EH_PE_omit)
2052         {
2053           if (cie->personality.X_op != fde->personality.X_op
2054               || (cie->personality.X_add_number
2055                   != fde->personality.X_add_number))
2056             continue;
2057           switch (cie->personality.X_op)
2058             {
2059             case O_constant:
2060               if (cie->personality.X_unsigned != fde->personality.X_unsigned)
2061                 continue;
2062               break;
2063             case O_symbol:
2064               if (cie->personality.X_add_symbol
2065                   != fde->personality.X_add_symbol)
2066                 continue;
2067               break;
2068             default:
2069               abort ();
2070             }
2071         }
2072       for (i = cie->first, j = fde->data;
2073            i != cie->last && j != NULL;
2074            i = i->next, j = j->next)
2075         {
2076           if (i->insn != j->insn)
2077             goto fail;
2078           switch (i->insn)
2079             {
2080             case DW_CFA_advance_loc:
2081             case DW_CFA_remember_state:
2082               /* We reached the first advance/remember in the FDE,
2083                  but did not reach the end of the CIE list.  */
2084               goto fail;
2085
2086             case DW_CFA_offset:
2087             case DW_CFA_def_cfa:
2088               if (i->u.ri.reg != j->u.ri.reg)
2089                 goto fail;
2090               if (i->u.ri.offset != j->u.ri.offset)
2091                 goto fail;
2092               break;
2093
2094             case DW_CFA_register:
2095               if (i->u.rr.reg1 != j->u.rr.reg1)
2096                 goto fail;
2097               if (i->u.rr.reg2 != j->u.rr.reg2)
2098                 goto fail;
2099               break;
2100
2101             case DW_CFA_def_cfa_register:
2102             case DW_CFA_restore:
2103             case DW_CFA_undefined:
2104             case DW_CFA_same_value:
2105               if (i->u.r != j->u.r)
2106                 goto fail;
2107               break;
2108
2109             case DW_CFA_def_cfa_offset:
2110               if (i->u.i != j->u.i)
2111                 goto fail;
2112               break;
2113
2114             case CFI_escape:
2115             case CFI_val_encoded_addr:
2116             case CFI_label:
2117               /* Don't bother matching these for now.  */
2118               goto fail;
2119
2120             default:
2121               abort ();
2122             }
2123         }
2124
2125       /* Success if we reached the end of the CIE list, and we've either
2126          run out of FDE entries or we've encountered an advance,
2127          remember, or escape.  */
2128       if (i == cie->last
2129           && (!j
2130               || j->insn == DW_CFA_advance_loc
2131               || j->insn == DW_CFA_remember_state
2132               || j->insn == CFI_escape
2133               || j->insn == CFI_val_encoded_addr
2134               || j->insn == CFI_label))
2135         {
2136           *pfirst = j;
2137           return cie;
2138         }
2139
2140     fail:;
2141     }
2142
2143   cie = XNEW (struct cie_entry);
2144   cie->next = cie_root;
2145   cie_root = cie;
2146   SET_CUR_SEG (cie, CUR_SEG (fde));
2147   cie->return_column = fde->return_column;
2148   cie->signal_frame = fde->signal_frame;
2149   cie->per_encoding = fde->per_encoding;
2150   cie->lsda_encoding = fde->lsda_encoding;
2151   cie->personality = fde->personality;
2152   cie->first = fde->data;
2153
2154   for (i = cie->first; i ; i = i->next)
2155     if (i->insn == DW_CFA_advance_loc
2156         || i->insn == DW_CFA_remember_state
2157         || i->insn == CFI_escape
2158         || i->insn == CFI_val_encoded_addr
2159         || i->insn == CFI_label)
2160       break;
2161
2162   cie->last = i;
2163   *pfirst = i;
2164
2165   output_cie (cie, eh_frame, align);
2166
2167   return cie;
2168 }
2169
2170 #ifdef md_reg_eh_frame_to_debug_frame
2171 static void
2172 cfi_change_reg_numbers (struct cfi_insn_data *insn, segT ccseg)
2173 {
2174   for (; insn; insn = insn->next)
2175     {
2176       if (CUR_SEG (insn) != ccseg)
2177         continue;
2178       switch (insn->insn)
2179         {
2180         case DW_CFA_advance_loc:
2181         case DW_CFA_def_cfa_offset:
2182         case DW_CFA_remember_state:
2183         case DW_CFA_restore_state:
2184         case DW_CFA_GNU_window_save:
2185         case CFI_escape:
2186         case CFI_label:
2187           break;
2188
2189         case DW_CFA_def_cfa:
2190         case DW_CFA_offset:
2191           insn->u.ri.reg = md_reg_eh_frame_to_debug_frame (insn->u.ri.reg);
2192           break;
2193
2194         case DW_CFA_def_cfa_register:
2195         case DW_CFA_undefined:
2196         case DW_CFA_same_value:
2197         case DW_CFA_restore:
2198           insn->u.r = md_reg_eh_frame_to_debug_frame (insn->u.r);
2199           break;
2200
2201         case DW_CFA_register:
2202           insn->u.rr.reg1 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg1);
2203           insn->u.rr.reg2 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg2);
2204           break;
2205
2206         case CFI_val_encoded_addr:
2207           insn->u.ea.reg = md_reg_eh_frame_to_debug_frame (insn->u.ea.reg);
2208           break;
2209
2210         default:
2211           abort ();
2212         }
2213     }
2214 }
2215 #else
2216 #define cfi_change_reg_numbers(insn, cseg) do { } while (0)
2217 #endif
2218
2219 #if SUPPORT_COMPACT_EH
2220 static void
2221 cfi_emit_eh_header (symbolS *sym, bfd_vma addend)
2222 {
2223   expressionS exp;
2224
2225   exp.X_add_number = addend;
2226   exp.X_add_symbol = sym;
2227   emit_expr_encoded (&exp, DW_EH_PE_sdata4 | DW_EH_PE_pcrel, FALSE);
2228 }
2229
2230 static void
2231 output_eh_header (struct fde_entry *fde)
2232 {
2233   char *p;
2234   bfd_vma addend;
2235
2236   if (fde->eh_header_type == EH_COMPACT_INLINE)
2237     addend = 0;
2238   else
2239     addend = 1;
2240
2241   cfi_emit_eh_header (fde->start_address, addend);
2242
2243   if (fde->eh_header_type == EH_COMPACT_INLINE)
2244     {
2245       p = frag_more (4);
2246       /* Inline entries always use PR1.  */
2247       *(p++) = 1;
2248       memcpy(p, fde->eh_data, 3);
2249     }
2250   else
2251     {
2252       if (fde->eh_header_type == EH_COMPACT_LEGACY)
2253         addend = 1;
2254       else if (fde->eh_header_type == EH_COMPACT_OUTLINE
2255                || fde->eh_header_type == EH_COMPACT_OUTLINE_DONE)
2256         addend = 0;
2257       else
2258         abort ();
2259       cfi_emit_eh_header (fde->eh_loc, addend);
2260     }
2261 }
2262 #endif
2263
2264 void
2265 cfi_finish (void)
2266 {
2267   struct cie_entry *cie, *cie_next;
2268   segT cfi_seg, ccseg;
2269   struct fde_entry *fde;
2270   struct cfi_insn_data *first;
2271   int save_flag_traditional_format, seek_next_seg;
2272
2273   if (all_fde_data == 0)
2274     return;
2275
2276   cfi_sections_set = TRUE;
2277   if ((all_cfi_sections & CFI_EMIT_eh_frame) != 0
2278       || (all_cfi_sections & CFI_EMIT_eh_frame_compact) != 0)
2279     {
2280       /* Make sure check_eh_frame doesn't do anything with our output.  */
2281       save_flag_traditional_format = flag_traditional_format;
2282       flag_traditional_format = 1;
2283
2284       if (!EH_FRAME_LINKONCE)
2285         {
2286           /* Open .eh_frame section.  */
2287           cfi_seg = get_cfi_seg (NULL, ".eh_frame",
2288                                  (SEC_ALLOC | SEC_LOAD | SEC_DATA
2289                                   | DWARF2_EH_FRAME_READ_ONLY),
2290                                  EH_FRAME_ALIGNMENT);
2291 #ifdef md_fix_up_eh_frame
2292           md_fix_up_eh_frame (cfi_seg);
2293 #else
2294           (void) cfi_seg;
2295 #endif
2296         }
2297
2298       do
2299         {
2300           ccseg = NULL;
2301           seek_next_seg = 0;
2302
2303           for (cie = cie_root; cie; cie = cie_next)
2304             {
2305               cie_next = cie->next;
2306               free ((void *) cie);
2307             }
2308           cie_root = NULL;
2309
2310           for (fde = all_fde_data; fde ; fde = fde->next)
2311             {
2312               if ((fde->sections & CFI_EMIT_eh_frame) == 0
2313                   && (fde->sections & CFI_EMIT_eh_frame_compact) == 0)
2314                 continue;
2315
2316 #if SUPPORT_COMPACT_EH
2317               /* Emit a LEGACY format header if we have processed all
2318                  of the .cfi directives without encountering either inline or
2319                  out-of-line compact unwinding opcodes.  */
2320               if (fde->eh_header_type == EH_COMPACT_HAS_LSDA
2321                   || fde->eh_header_type == EH_COMPACT_UNKNOWN)
2322                 fde->eh_header_type = EH_COMPACT_LEGACY;
2323
2324               if (fde->eh_header_type != EH_COMPACT_LEGACY)
2325                 continue;
2326 #endif
2327               if (EH_FRAME_LINKONCE)
2328                 {
2329                   if (HANDLED (fde))
2330                     continue;
2331                   if (seek_next_seg && CUR_SEG (fde) != ccseg)
2332                     {
2333                       seek_next_seg = 2;
2334                       continue;
2335                     }
2336                   if (!seek_next_seg)
2337                     {
2338                       ccseg = CUR_SEG (fde);
2339                       /* Open .eh_frame section.  */
2340                       cfi_seg = get_cfi_seg (ccseg, ".eh_frame",
2341                                              (SEC_ALLOC | SEC_LOAD | SEC_DATA
2342                                               | DWARF2_EH_FRAME_READ_ONLY),
2343                                              EH_FRAME_ALIGNMENT);
2344 #ifdef md_fix_up_eh_frame
2345                       md_fix_up_eh_frame (cfi_seg);
2346 #else
2347                       (void) cfi_seg;
2348 #endif
2349                       seek_next_seg = 1;
2350                     }
2351                   SET_HANDLED (fde, 1);
2352                 }
2353
2354               if (fde->end_address == NULL)
2355                 {
2356                   as_bad (_("open CFI at the end of file; "
2357                             "missing .cfi_endproc directive"));
2358                   fde->end_address = fde->start_address;
2359                 }
2360
2361               cie = select_cie_for_fde (fde, TRUE, &first, 2);
2362               fde->eh_loc = symbol_temp_new_now ();
2363               output_fde (fde, cie, TRUE, first,
2364                           fde->next == NULL ? EH_FRAME_ALIGNMENT : 2);
2365             }
2366         }
2367       while (EH_FRAME_LINKONCE && seek_next_seg == 2);
2368
2369       if (EH_FRAME_LINKONCE)
2370         for (fde = all_fde_data; fde ; fde = fde->next)
2371           SET_HANDLED (fde, 0);
2372
2373 #if SUPPORT_COMPACT_EH
2374       if (compact_eh)
2375         {
2376           /* Create remaining out of line table entries.  */
2377           do
2378             {
2379               ccseg = NULL;
2380               seek_next_seg = 0;
2381
2382               for (fde = all_fde_data; fde ; fde = fde->next)
2383                 {
2384                   if ((fde->sections & CFI_EMIT_eh_frame) == 0
2385                       && (fde->sections & CFI_EMIT_eh_frame_compact) == 0)
2386                     continue;
2387
2388                   if (fde->eh_header_type != EH_COMPACT_OUTLINE)
2389                     continue;
2390                   if (HANDLED (fde))
2391                     continue;
2392                   if (seek_next_seg && CUR_SEG (fde) != ccseg)
2393                     {
2394                       seek_next_seg = 2;
2395                       continue;
2396                     }
2397                   if (!seek_next_seg)
2398                     {
2399                       ccseg = CUR_SEG (fde);
2400                       /* Open .gnu_extab section.  */
2401                       get_cfi_seg (ccseg, ".gnu_extab",
2402                                    (SEC_ALLOC | SEC_LOAD | SEC_DATA
2403                                     | DWARF2_EH_FRAME_READ_ONLY),
2404                                    1);
2405                       seek_next_seg = 1;
2406                     }
2407                   SET_HANDLED (fde, 1);
2408
2409                   frag_align (1, 0, 0);
2410                   record_alignment (now_seg, 1);
2411                   output_compact_unwind_data (fde, 1);
2412                 }
2413             }
2414           while (EH_FRAME_LINKONCE && seek_next_seg == 2);
2415
2416           for (fde = all_fde_data; fde ; fde = fde->next)
2417             SET_HANDLED (fde, 0);
2418
2419           /* Create index table fragments.  */
2420           do
2421             {
2422               ccseg = NULL;
2423               seek_next_seg = 0;
2424
2425               for (fde = all_fde_data; fde ; fde = fde->next)
2426                 {
2427                   if ((fde->sections & CFI_EMIT_eh_frame) == 0
2428                       && (fde->sections & CFI_EMIT_eh_frame_compact) == 0)
2429                     continue;
2430
2431                   if (HANDLED (fde))
2432                     continue;
2433                   if (seek_next_seg && CUR_SEG (fde) != ccseg)
2434                     {
2435                       seek_next_seg = 2;
2436                       continue;
2437                     }
2438                   if (!seek_next_seg)
2439                     {
2440                       ccseg = CUR_SEG (fde);
2441                       /* Open .eh_frame_entry section.  */
2442                       cfi_seg = get_cfi_seg (ccseg, ".eh_frame_entry",
2443                                              (SEC_ALLOC | SEC_LOAD | SEC_DATA
2444                                               | DWARF2_EH_FRAME_READ_ONLY),
2445                                              2);
2446                       seek_next_seg = 1;
2447                     }
2448                   SET_HANDLED (fde, 1);
2449
2450                   output_eh_header (fde);
2451                 }
2452             }
2453           while (seek_next_seg == 2);
2454
2455           for (fde = all_fde_data; fde ; fde = fde->next)
2456             SET_HANDLED (fde, 0);
2457         }
2458 #endif /* SUPPORT_COMPACT_EH */
2459
2460       flag_traditional_format = save_flag_traditional_format;
2461     }
2462
2463   cfi_sections_set = TRUE;
2464   if ((all_cfi_sections & CFI_EMIT_debug_frame) != 0)
2465     {
2466       int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1;
2467
2468       if (!SUPPORT_FRAME_LINKONCE)
2469         get_cfi_seg (NULL, ".debug_frame",
2470                      SEC_READONLY | SEC_DEBUGGING,
2471                      alignment);
2472
2473       do
2474         {
2475           ccseg = NULL;
2476           seek_next_seg = 0;
2477
2478           for (cie = cie_root; cie; cie = cie_next)
2479             {
2480               cie_next = cie->next;
2481               free ((void *) cie);
2482             }
2483           cie_root = NULL;
2484
2485           for (fde = all_fde_data; fde ; fde = fde->next)
2486             {
2487               if ((fde->sections & CFI_EMIT_debug_frame) == 0)
2488                 continue;
2489
2490               if (SUPPORT_FRAME_LINKONCE)
2491                 {
2492                   if (HANDLED (fde))
2493                     continue;
2494                   if (seek_next_seg && CUR_SEG (fde) != ccseg)
2495                     {
2496                       seek_next_seg = 2;
2497                       continue;
2498                     }
2499                   if (!seek_next_seg)
2500                     {
2501                       ccseg = CUR_SEG (fde);
2502                       /* Open .debug_frame section.  */
2503                       get_cfi_seg (ccseg, ".debug_frame",
2504                                    SEC_READONLY | SEC_DEBUGGING,
2505                                    alignment);
2506                       seek_next_seg = 1;
2507                     }
2508                   SET_HANDLED (fde, 1);
2509                 }
2510               if (fde->end_address == NULL)
2511                 {
2512                   as_bad (_("open CFI at the end of file; "
2513                             "missing .cfi_endproc directive"));
2514                   fde->end_address = fde->start_address;
2515                 }
2516
2517               fde->per_encoding = DW_EH_PE_omit;
2518               fde->lsda_encoding = DW_EH_PE_omit;
2519               cfi_change_reg_numbers (fde->data, ccseg);
2520               cie = select_cie_for_fde (fde, FALSE, &first, alignment);
2521               output_fde (fde, cie, FALSE, first, alignment);
2522             }
2523         }
2524       while (SUPPORT_FRAME_LINKONCE && seek_next_seg == 2);
2525
2526       if (SUPPORT_FRAME_LINKONCE)
2527         for (fde = all_fde_data; fde ; fde = fde->next)
2528           SET_HANDLED (fde, 0);
2529     }
2530 }
2531
2532 #else /* TARGET_USE_CFIPOP */
2533
2534 /* Emit an intelligible error message for missing support.  */
2535
2536 static void
2537 dot_cfi_dummy (int ignored ATTRIBUTE_UNUSED)
2538 {
2539   as_bad (_("CFI is not supported for this target"));
2540   ignore_rest_of_line ();
2541 }
2542
2543 const pseudo_typeS cfi_pseudo_table[] =
2544   {
2545     { "cfi_sections", dot_cfi_dummy, 0 },
2546     { "cfi_startproc", dot_cfi_dummy, 0 },
2547     { "cfi_endproc", dot_cfi_dummy, 0 },
2548     { "cfi_fde_data", dot_cfi_dummy, 0 },
2549     { "cfi_def_cfa", dot_cfi_dummy, 0 },
2550     { "cfi_def_cfa_register", dot_cfi_dummy, 0 },
2551     { "cfi_def_cfa_offset", dot_cfi_dummy, 0 },
2552     { "cfi_adjust_cfa_offset", dot_cfi_dummy, 0 },
2553     { "cfi_offset", dot_cfi_dummy, 0 },
2554     { "cfi_rel_offset", dot_cfi_dummy, 0 },
2555     { "cfi_register", dot_cfi_dummy, 0 },
2556     { "cfi_return_column", dot_cfi_dummy, 0 },
2557     { "cfi_restore", dot_cfi_dummy, 0 },
2558     { "cfi_undefined", dot_cfi_dummy, 0 },
2559     { "cfi_same_value", dot_cfi_dummy, 0 },
2560     { "cfi_remember_state", dot_cfi_dummy, 0 },
2561     { "cfi_restore_state", dot_cfi_dummy, 0 },
2562     { "cfi_window_save", dot_cfi_dummy, 0 },
2563     { "cfi_escape", dot_cfi_dummy, 0 },
2564     { "cfi_signal_frame", dot_cfi_dummy, 0 },
2565     { "cfi_personality", dot_cfi_dummy, 0 },
2566     { "cfi_personality_id", dot_cfi_dummy, 0 },
2567     { "cfi_lsda", dot_cfi_dummy, 0 },
2568     { "cfi_val_encoded_addr", dot_cfi_dummy, 0 },
2569     { "cfi_label", dot_cfi_dummy, 0 },
2570     { "cfi_inline_lsda", dot_cfi_dummy, 0 },
2571     { "cfi_val_offset", dot_cfi_dummy, 0 },
2572     { NULL, NULL, 0 }
2573   };
2574
2575 void
2576 cfi_finish (void)
2577 {
2578 }
2579 #endif /* TARGET_USE_CFIPOP */