ld/ldgram.y

   1 /* A YACC grammer to parse a superset of the AT&T linker scripting languaue.
   2    Copyright (C) 1991 Free Software Foundation, Inc.
   3    Written by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
   4
   5 This file is part of GNU ld.
   6
   7 This program 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 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program 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 this program; if not, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 %{
  22 /*
  23
  24  */
  25
  26 #define DONTDECLARE_MALLOC
  27
  28 #include "bfd.h"
  29 #include "sysdep.h"
  30 #include "ld.h"
  31 #include "ldexp.h"
  32 #include "ldver.h"
  33 #include "ldlang.h"
  34 #include "ldemul.h"
  35 #include "ldfile.h"
  36 #include "ldmisc.h"
  37 #include "mri.h"
  38
  39 #define YYDEBUG 1
  40
  41 boolean option_v;
  42 extern unsigned int lineno;
  43 extern boolean trace_files;
  44 extern boolean write_map;
  45 extern boolean option_longmap;
  46 extern int g_switch_value;
  47 boolean hex_mode;
  48 static int typebits;
  49 strip_symbols_type strip_symbols=STRIP_NONE;
  50 discard_locals_type discard_locals=DISCARD_NONE;
  51
  52
  53 lang_memory_region_type *region;
  54
  55
  56 lang_memory_region_type *lang_memory_region_lookup();
  57 lang_output_section_statement_type *lang_output_section_statement_lookup();
  58 etree_type *lang_atin();
  59 #ifdef __STDC__
  60
  61 void lang_add_data(int type, union etree_union *exp);
  62 void lang_enter_output_section_statement(char *output_section_statement_name, etree_type *address_exp, int flags, bfd_vma block_value,etree_type*,etree_type*, etree_type*);
  63
  64 #else
  65
  66 void lang_add_data();
  67 void lang_enter_output_section_statement();
  68
  69 #endif /* __STDC__ */
  70
  71 extern args_type command_line;
  72 char *current_file;
  73 boolean ldgram_want_filename = true;
  74 boolean had_script = false;
  75 boolean force_make_executable = false;
  76
  77 boolean ldgram_in_script = false;
  78 boolean ldgram_had_equals = false;
  79 /* LOCALS */
  80
  81
  82 #define ERROR_NAME_MAX 20
  83 static char *error_names[ERROR_NAME_MAX];
  84 static int error_index;
  85 #define PUSH_ERROR(x) if (error_index < ERROR_NAME_MAX) error_names[error_index] = x; error_index++;
  86 #define POP_ERROR()   error_index--;
  87 %}
  88 %union {
  89   bfd_vma integer;
  90   int voidval;
  91   char *name;
  92   int token;
  93   union etree_union *etree;
  94   struct sec *section;
  95   struct lang_output_section_statement_struct *output_section_statement;
  96   union  lang_statement_union **statement_ptr;
  97   int lineno;
  98   struct {
  99     FILE *file;
 100     char *name;
 101     unsigned int lineno;
 102   } state;
 103
 104
 105 }
 106
 107 %type <etree> exp  opt_exp_with_type  mustbe_exp opt_at
 108 %type <integer> fill_opt
 109 %type <name> memspec_opt
 110 %token <integer> INT
 111 %token <name> NAME
 112 %type  <integer> length
 113
 114 %right <token> PLUSEQ MINUSEQ MULTEQ DIVEQ  '=' LSHIFTEQ RSHIFTEQ   ANDEQ OREQ
 115 %right <token> '?' ':'
 116 %left <token> OROR
 117 %left <token>  ANDAND
 118 %left <token> '|'
 119 %left <token>  '^'
 120 %left  <token> '&'
 121 %left <token>  EQ NE
 122 %left  <token> '<' '>' LE GE
 123 %left  <token> LSHIFT RSHIFT
 124
 125 %left  <token> '+' '-'
 126 %left  <token> '*' '/' '%'
 127
 128 /*%token <token> '+' '-' '*' '/' '%'*/
 129 %right UNARY
 130 %token END
 131 %left <token> '('
 132 %token <token> ALIGN_K BLOCK LONG SHORT BYTE
 133 %token SECTIONS
 134 %token '{' '}'
 135 %token SIZEOF_HEADERS OUTPUT_FORMAT FORCE_COMMON_ALLOCATION OUTPUT_ARCH
 136 %token SIZEOF_HEADERS
 137 %token INCLUDE
 138 %token MEMORY  DEFSYMEND
 139 %token NOLOAD DSECT COPY INFO OVERLAY
 140 %token NAME DEFINED TARGET_K SEARCH_DIR MAP ENTRY
 141 %token OPTION_e OPTION_c OPTION_noinhibit_exec OPTION_s OPTION_S OPTION_sort_common
 142 %token OPTION_EB OPTION_EL OPTION_G OPTION_Gval OPTION_help
 143 %token OPTION_format OPTION_oformat  OPTION_F OPTION_u OPTION_Bstatic OPTION_N
 144 %token <integer> SIZEOF NEXT ADDR
 145 %token OPTION_d OPTION_dc OPTION_dp OPTION_x OPTION_X OPTION_defsym
 146 %token OPTION_v OPTION_V OPTION_m OPTION_memul OPTION_M OPTION_t STARTUP HLL SYSLIB FLOAT  NOFLOAT
 147 %token OPTION_Map
 148 %token OPTION_n OPTION_r OPTION_o OPTION_b  OPTION_R OPTION_relax OPTION_version
 149 %token <name> OPTION_l OPTION_L OPTION_T OPTION_Aarch OPTION_Tfile  OPTION_Texp
 150 %token <name> OPTION_y
 151 %token OPTION_Ur
 152 %token ORIGIN FILL OPTION_g
 153 %token LENGTH    CREATE_OBJECT_SYMBOLS INPUT OUTPUT  CONSTRUCTORS
 154 %token OPTION_RETAIN_SYMBOLS_FILE ALIGNMOD AT
 155
 156 %type <token> assign_op
 157
 158 %type <name>  filename
 159
 160
 161 %token CHIP LIST SECT ABSOLUTE  LOAD NEWLINE ENDWORD ORDER NAMEWORD
 162 %token FORMAT PUBLIC DEFSYMEND BASE ALIAS TRUNCATE
 163
 164 %{
 165 ld_config_type config;
 166 %}
 167
 168 %%
 169
 170 file:   command_line  { lang_final(); };
 171
 172
 173 filename:  NAME;
 174
 175
 176 command_line:
 177                 command_line command_line_option
 178         |
 179         ;
 180
 181 command_line_option:
 182                 OPTION_Bstatic { }
 183         |       OPTION_help
 184                         {
 185                         help ();
 186                         exit (0);
 187                         }
 188         |       OPTION_v
 189                         {
 190                         ldversion(0);
 191                         }
 192         |       OPTION_V
 193                         {
 194                         ldversion(1);
 195                         option_v = true;
 196                         }
 197         |       OPTION_version
 198                         {
 199                         ldversion(0);
 200                         exit(0);
 201                         }
 202         |       OPTION_t {
 203                         trace_files = true;
 204                         }
 205         |     OPTION_Map  NAME
 206                 {
 207                 write_map = true;
 208                 config.map_filename = $2;
 209                 }
 210         |       OPTION_m NAME
 211                 {
 212                   /* Ignore.  */
 213                 }
 214         |       OPTION_memul
 215                 {
 216                   /* Ignore.  */
 217                 }
 218         |       OPTION_M
 219                 {
 220                   config.map_filename = "-";
 221                 }
 222         |       OPTION_n {
 223                         config.magic_demand_paged = false;
 224                         }
 225         |       OPTION_N {
 226                         config.text_read_only = false;
 227                         config.magic_demand_paged = false;
 228                         }
 229         |       OPTION_s {
 230                         strip_symbols = STRIP_ALL;
 231                         }
 232         |       OPTION_S {
 233                         strip_symbols = STRIP_DEBUGGER;
 234                         }
 235         |       OPTION_u NAME {
 236                         ldlang_add_undef($2);
 237                 }
 238
 239         |       OPTION_r {
 240                         config.relocateable_output = true;
 241                         config.build_constructors = false;
 242                         config.magic_demand_paged = false;
 243                         config.text_read_only = false;
 244                         }
 245         |       OPTION_Ur {
 246                         config.relocateable_output = true;
 247                         config.build_constructors = true;
 248                         config.magic_demand_paged = false;
 249                         config.text_read_only = false;
 250                       }
 251         |       OPTION_o filename
 252                         {
 253                         lang_add_output($2);
 254                         }
 255         |       OPTION_e NAME
 256                         { lang_add_entry($2);
 257                         }
 258         |       OPTION_X {
 259                         discard_locals = DISCARD_L;
 260                 }
 261         |       OPTION_x {
 262                         discard_locals = DISCARD_ALL;
 263                 }
 264
 265         |       OPTION_noinhibit_exec
 266                         {
 267                         force_make_executable = true;
 268                         }
 269         |      OPTION_sort_common
 270                         {
 271                         config.sort_common = true;
 272                         }
 273         |      OPTION_d {
 274                           command_line.force_common_definition = true;
 275                         }
 276
 277         |      OPTION_relax {
 278                           command_line.relax = true;
 279                         }
 280         |      OPTION_dc
 281                          {
 282                           command_line.force_common_definition = true;
 283                         }
 284         |       OPTION_g
 285                         {
 286                         /* Ignored */
 287                         }
 288         |       OPTION_dp
 289                          {
 290                           command_line.force_common_definition = true;
 291                         }
 292         |       OPTION_format NAME
 293                    {
 294                           lang_add_target($2);
 295                    }
 296         |       OPTION_oformat NAME
 297                    {
 298                           lang_add_output_format($2, 0);
 299                    }
 300         |       OPTION_Texp
 301                 { ldlex_expression();
 302                         hex_mode  = 16;
 303                 }
 304                 INT
 305                 {  ldlex_popstate();
 306                         lang_section_start($1,exp_intop($3));
 307                         hex_mode = 0;
 308                 }
 309         |       OPTION_y
 310                         {
 311                         add_ysym($1);
 312                         }
 313         |       OPTION_Aarch
 314                 {
 315                         ldfile_add_arch($1);
 316                 }
 317         |        OPTION_b NAME
 318                         {
 319                         lang_add_target($2);
 320                         }
 321         |       OPTION_L
 322                         {
 323                         ldfile_add_library_path($1);
 324                         }
 325         |       OPTION_F
 326                 {
 327                 /* Ignore */
 328                 }
 329         |       OPTION_c filename
 330                         {ldfile_open_command_file($2); }
 331                 mri_script_file  END {  ldlex_command();}
 332
 333         |       OPTION_Tfile
 334                         { ldfile_open_command_file($1); } script_file
 335                         END {  ldlex_command();}
 336
 337         |       OPTION_T filename
 338                         { ldfile_open_command_file($2); } script_file
 339                 END {  ldlex_command();}
 340
 341         |       OPTION_l
 342                         {
 343                           lang_add_input_file($1,
 344                                          lang_input_file_is_l_enum,
 345                                          (char *)NULL);
 346                         }
 347         |       OPTION_R filename
 348                         {
 349                         lang_add_input_file($2,
 350                                 lang_input_file_is_symbols_only_enum,
 351                                 (char *)NULL);
 352                         }
 353
 354         |       OPTION_defsym  { ldlex_defsym(); }
 355                 NAME     '=' exp  DEFSYMEND { ldlex_popstate();
 356                         lang_add_assignment(exp_assop($4,$3,$5));
 357                         }
 358         |       OPTION_RETAIN_SYMBOLS_FILE filename
 359                 { lang_add_keepsyms_file ($2); }
 360         |       OPTION_EB
 361                 {
 362                   /* FIXME: This is currently ignored.  It means
 363                      ``produce a big-endian object file''.  It could
 364                      be used to select an output format.  */
 365                 }
 366         |       OPTION_EL
 367                 {
 368                   /* FIXME: This is currently ignored.  It means
 369                      ``produce a little-endian object file''.  It could
 370                      be used to select an output format.  */
 371                 }
 372         |       OPTION_G NAME
 373                 {
 374                   g_switch_value = atoi ($2);
 375                 }
 376         |       OPTION_Gval
 377                 {
 378                   g_switch_value = yylval.integer;
 379                 }
 380         |       NAME
 381                 {
 382                   if (*$1 == '-')
 383                     einfo("%P%F: illegal option -- %s\n", $1);
 384                   else
 385                     lang_add_input_file($1,lang_input_file_is_file_enum,
 386                                         (char *)NULL);
 387                 }
 388         ;
 389
 390
 391 /* SYNTAX WITHIN AN MRI SCRIPT FILE */
 392 mri_script_file:
 393                 {       ldlex_mri_script();
 394                         PUSH_ERROR("MRI style script");
 395                 }
 396              mri_script_lines
 397                 {       ldlex_popstate();
 398                         POP_ERROR();
 399                 }
 400         ;
 401
 402 mri_script_lines:
 403                 mri_script_lines mri_script_command NEWLINE
 404           |
 405         ;
 406
 407 mri_script_command:
 408                 CHIP  exp
 409         |       CHIP  exp ',' exp
 410         |       NAME    {
 411                         einfo("%P%F: unrecognised keyword in MRI style script '%s'\n",$1);
 412                         }
 413         |       LIST    {
 414                         write_map = true;
 415                         config.map_filename = "-";
 416                         }
 417         |       ORDER ordernamelist
 418         |       ENDWORD
 419         |       PUBLIC NAME '=' exp
 420                         { mri_public($2, $4); }
 421         |       PUBLIC NAME ',' exp
 422                         { mri_public($2, $4); }
 423         |       PUBLIC NAME  exp
 424                         { mri_public($2, $3); }
 425         |       FORMAT NAME
 426                         { mri_format($2); }
 427         |       SECT NAME ',' exp
 428                         { mri_output_section($2, $4);}
 429         |       SECT NAME  exp
 430                         { mri_output_section($2, $3);}
 431         |       SECT NAME '=' exp
 432                         { mri_output_section($2, $4);}
 433         |       ALIGN_K NAME '=' exp
 434                         { mri_align($2,$4); }
 435         |       ALIGNMOD NAME '=' exp
 436                         { mri_alignmod($2,$4); }
 437         |       ABSOLUTE mri_abs_name_list
 438         |       LOAD     mri_load_name_list
 439         |       NAMEWORD NAME
 440                         { mri_name($2); }
 441         |       ALIAS NAME ',' NAME
 442                         { mri_alias($2,$4,0);}
 443         |       ALIAS NAME ',' INT
 444                         { mri_alias($2,0,$4);}
 445         |       BASE     exp
 446                         { mri_base($2); }
 447         |       TRUNCATE INT
 448                 {  mri_truncate($2); }
 449         |
 450         ;
 451
 452 ordernamelist:
 453               ordernamelist ',' NAME         { mri_order($3); }
 454         |     ordernamelist  NAME         { mri_order($2); }
 455         |
 456         ;
 457
 458 mri_load_name_list:
 459                 NAME
 460                         { mri_load($1); }
 461         |       mri_load_name_list ',' NAME { mri_load($3); }
 462         ;
 463
 464 mri_abs_name_list:
 465                 NAME
 466                         { mri_only_load($1); }
 467         |       mri_abs_name_list ','  NAME
 468                         { mri_only_load($3); }
 469         ;
 470
 471 script_file:
 472         {
 473          ldlex_both();
 474         }
 475        ifile_list
 476         {
 477         ldlex_popstate();
 478         }
 479         ;
 480
 481
 482 ifile_list:
 483        ifile_list ifile_p1
 484         |
 485         ;
 486
 487
 488
 489 ifile_p1:
 490                 memory
 491         |       sections
 492         |       startup
 493         |       high_level_library
 494         |       low_level_library
 495         |       floating_point_support
 496         |       statement_anywhere
 497         |        ';'
 498         |       TARGET_K '(' NAME ')'
 499                 { lang_add_target($3); }
 500         |       SEARCH_DIR '(' filename ')'
 501                 { ldfile_add_library_path($3); }
 502         |       OUTPUT '(' filename ')'
 503                 { lang_add_output($3); }
 504         | OUTPUT_FORMAT '(' NAME ')'
 505                   { lang_add_output_format($3, 1); }
 506         | OUTPUT_ARCH '(' NAME ')'
 507                   { ldfile_set_output_arch($3); }
 508         |       FORCE_COMMON_ALLOCATION
 509                 { command_line.force_common_definition = true ; }
 510         |       INPUT '(' input_list ')'
 511         |       MAP '(' filename ')'
 512                 { lang_add_map($3); }
 513         |       INCLUDE filename
 514                 { ldfile_open_command_file($2); } ifile_list END
 515         ;
 516
 517 input_list:
 518                 NAME
 519                 { lang_add_input_file($1,lang_input_file_is_file_enum,
 520                                  (char *)NULL); }
 521         |       input_list ',' NAME
 522                 { lang_add_input_file($3,lang_input_file_is_file_enum,
 523                                  (char *)NULL); }
 524         |       input_list NAME
 525                 { lang_add_input_file($2,
 526 lang_input_file_is_file_enum,
 527                                  (char *)NULL); }
 528         ;
 529
 530 sections:
 531                 SECTIONS '{' sec_or_group_p1 '}'
 532         ;
 533
 534 sec_or_group_p1:
 535                 sec_or_group_p1 section
 536         |       sec_or_group_p1 statement_anywhere
 537         |
 538         ;
 539
 540 statement_anywhere:
 541                 ENTRY '(' NAME ')'
 542                 { lang_add_entry($3); }
 543         |       assignment end
 544         ;
 545
 546 file_NAME_list:
 547                 NAME
 548                         { lang_add_wild($1, current_file); }
 549         |       file_NAME_list opt_comma NAME
 550                         { lang_add_wild($3, current_file); }
 551         ;
 552
 553 input_section_spec:
 554                 NAME
 555                 {
 556                 lang_add_wild((char *)NULL, $1);
 557                 }
 558         |       '['
 559                         {
 560                         current_file = (char *)NULL;
 561                         }
 562                         file_NAME_list
 563                 ']'
 564         |       NAME
 565                         {
 566                         current_file =$1;
 567                         }
 568                 '(' file_NAME_list ')'
 569         |       '*'
 570                         {
 571                         current_file = (char *)NULL;
 572                         }
 573                 '(' file_NAME_list ')'
 574         ;
 575
 576 statement:
 577                 assignment end
 578         |       CREATE_OBJECT_SYMBOLS
 579                 {
 580                 lang_add_attribute(lang_object_symbols_statement_enum);
 581                 }
 582         |       ';'
 583         |       CONSTRUCTORS
 584                 {
 585
 586                   lang_add_attribute(lang_constructors_statement_enum);
 587                 }
 588         | input_section_spec
 589         | length '(' exp ')'
 590                         {
 591                         lang_add_data($1,$3);
 592                         }
 593
 594         | FILL '(' exp ')'
 595                         {
 596                           lang_add_fill
 597                             (exp_get_value_int($3,
 598                                                0,
 599                                                "fill value",
 600                                                lang_first_phase_enum));
 601                         }
 602         ;
 603
 604 statement_list:
 605                 statement_list statement
 606         |       statement
 607         ;
 608
 609 statement_list_opt:
 610                 /* empty */
 611         |       statement_list
 612         ;
 613
 614 length:
 615                 LONG
 616                         { $$ = $1; }
 617         |       SHORT
 618                         { $$ = $1; }
 619         |       BYTE
 620                         { $$ = $1; }
 621         ;
 622
 623 fill_opt:
 624           '=' mustbe_exp
 625                 {
 626                   $$ =   exp_get_value_int($2,
 627                                            0,
 628                                            "fill value",
 629                                            lang_first_phase_enum);
 630                 }
 631         |       { $$ = 0; }
 632         ;
 633
 634
 635
 636 assign_op:
 637                 PLUSEQ
 638                         { $$ = '+'; }
 639         |       MINUSEQ
 640                         { $$ = '-'; }
 641         |       MULTEQ
 642                         { $$ = '*'; }
 643         |       DIVEQ
 644                         { $$ = '/'; }
 645         |       LSHIFTEQ
 646                         { $$ = LSHIFT; }
 647         |       RSHIFTEQ
 648                         { $$ = RSHIFT; }
 649         |       ANDEQ
 650                         { $$ = '&'; }
 651         |       OREQ
 652                         { $$ = '|'; }
 653
 654         ;
 655
 656 end:    ';' | ','
 657         ;
 658
 659
 660 assignment:
 661                 NAME '=' mustbe_exp
 662                 {
 663                   lang_add_assignment(exp_assop($2,$1,$3));
 664                 }
 665         |       NAME assign_op mustbe_exp
 666                 {
 667
 668 lang_add_assignment(exp_assop('=',$1,exp_binop($2,exp_nameop(NAME,$1),$3)));
 669                 }
 670
 671         ;
 672
 673
 674 opt_comma:
 675                 ','     |       ;
 676
 677
 678 memory:
 679                 MEMORY '{' memory_spec memory_spec_list '}'
 680         ;
 681
 682 memory_spec_list:
 683                 memory_spec_list memory_spec
 684         |       memory_spec_list ',' memory_spec
 685         |
 686         ;
 687
 688
 689 memory_spec:            NAME
 690                         { region = lang_memory_region_lookup($1); }
 691                 attributes_opt ':'
 692                 origin_spec opt_comma length_spec
 693
 694         ; origin_spec:
 695         ORIGIN '=' mustbe_exp
 696                 { region->current =
 697                  region->origin =
 698                  exp_get_vma($3, 0L,"origin", lang_first_phase_enum);
 699 }
 700         ; length_spec:
 701              LENGTH '=' mustbe_exp
 702                { region->length = exp_get_vma($3,
 703                                                ~((bfd_vma)0),
 704                                                "length",
 705                                                lang_first_phase_enum);
 706                 }
 707
 708
 709 attributes_opt:
 710                   '(' NAME ')'
 711                         {
 712                         lang_set_flags(&region->flags, $2);
 713                         }
 714         |
 715
 716         ;
 717
 718 startup:
 719         STARTUP '(' filename ')'
 720                 { lang_startup($3); }
 721         ;
 722
 723 high_level_library:
 724                 HLL '(' high_level_library_NAME_list ')'
 725         |       HLL '(' ')'
 726                         { ldemul_hll((char *)NULL); }
 727         ;
 728
 729 high_level_library_NAME_list:
 730                 high_level_library_NAME_list opt_comma filename
 731                         { ldemul_hll($3); }
 732         |       filename
 733                         { ldemul_hll($1); }
 734
 735         ;
 736
 737 low_level_library:
 738         SYSLIB '(' low_level_library_NAME_list ')'
 739         ; low_level_library_NAME_list:
 740                 low_level_library_NAME_list opt_comma filename
 741                         { ldemul_syslib($3); }
 742         |
 743         ;
 744
 745 floating_point_support:
 746                 FLOAT
 747                         { lang_float(true); }
 748         |       NOFLOAT
 749                         { lang_float(false); }
 750         ;
 751
 752
 753 mustbe_exp:              { ldlex_expression(); }
 754                 exp
 755                          { ldlex_popstate(); $$=$2;}
 756         ;
 757
 758 exp     :
 759                 '-' exp %prec UNARY
 760                         { $$ = exp_unop('-', $2); }
 761         |       '(' exp ')'
 762                         { $$ = $2; }
 763         |       NEXT '(' exp ')' %prec UNARY
 764                         { $$ = exp_unop($1,$3); }
 765         |       '!' exp %prec UNARY
 766                         { $$ = exp_unop('!', $2); }
 767         |       '+' exp %prec UNARY
 768                         { $$ = $2; }
 769         |       '~' exp %prec UNARY
 770                         { $$ = exp_unop('~', $2);}
 771
 772         |       exp '*' exp
 773                         { $$ = exp_binop('*', $1, $3); }
 774         |       exp '/' exp
 775                         { $$ = exp_binop('/', $1, $3); }
 776         |       exp '%' exp
 777                         { $$ = exp_binop('%', $1, $3); }
 778         |       exp '+' exp
 779                         { $$ = exp_binop('+', $1, $3); }
 780         |       exp '-' exp
 781                         { $$ = exp_binop('-' , $1, $3); }
 782         |       exp LSHIFT exp
 783                         { $$ = exp_binop(LSHIFT , $1, $3); }
 784         |       exp RSHIFT exp
 785                         { $$ = exp_binop(RSHIFT , $1, $3); }
 786         |       exp EQ exp
 787                         { $$ = exp_binop(EQ , $1, $3); }
 788         |       exp NE exp
 789                         { $$ = exp_binop(NE , $1, $3); }
 790         |       exp LE exp
 791                         { $$ = exp_binop(LE , $1, $3); }
 792         |       exp GE exp
 793                         { $$ = exp_binop(GE , $1, $3); }
 794         |       exp '<' exp
 795                         { $$ = exp_binop('<' , $1, $3); }
 796         |       exp '>' exp
 797                         { $$ = exp_binop('>' , $1, $3); }
 798         |       exp '&' exp
 799                         { $$ = exp_binop('&' , $1, $3); }
 800         |       exp '^' exp
 801                         { $$ = exp_binop('^' , $1, $3); }
 802         |       exp '|' exp
 803                         { $$ = exp_binop('|' , $1, $3); }
 804         |       exp '?' exp ':' exp
 805                         { $$ = exp_trinop('?' , $1, $3, $5); }
 806         |       exp ANDAND exp
 807                         { $$ = exp_binop(ANDAND , $1, $3); }
 808         |       exp OROR exp
 809                         { $$ = exp_binop(OROR , $1, $3); }
 810         |       DEFINED '(' NAME ')'
 811                         { $$ = exp_nameop(DEFINED, $3); }
 812         |       INT
 813                         { $$ = exp_intop($1); }
 814         |       SIZEOF_HEADERS
 815                         { $$ = exp_nameop(SIZEOF_HEADERS,0); }
 816
 817         |       SIZEOF '(' NAME ')'
 818                         { $$ = exp_nameop(SIZEOF,$3); }
 819         |       ADDR '(' NAME ')'
 820                         { $$ = exp_nameop(ADDR,$3); }
 821         |       ABSOLUTE '(' exp ')'
 822                         { $$ = exp_unop(ABSOLUTE, $3); }
 823         |       ALIGN_K '(' exp ')'
 824                         { $$ = exp_unop(ALIGN_K,$3); }
 825         |       NAME
 826                         { $$ = exp_nameop(NAME,$1); }
 827         ;
 828
 829
 830 opt_at:
 831                 AT '(' exp ')' { $$ = $3; }
 832         |       { $$ = 0; }
 833         ;
 834
 835 section:        NAME            { ldlex_expression(); }
 836                 opt_exp_with_type
 837                 opt_at          { ldlex_popstate(); }
 838                 '{'
 839                         {
 840                         lang_enter_output_section_statement($1,$3,typebits,0,0,0,$4);
 841                         }
 842                 statement_list_opt
 843                 '}' {ldlex_expression();} fill_opt memspec_opt
 844                 {
 845                   ldlex_popstate();
 846                   lang_leave_output_section_statement($11, $12);
 847                 }
 848 opt_comma
 849
 850         ;
 851
 852 type:
 853            NOLOAD  { typebits = SEC_NEVER_LOAD; }
 854         |  DSECT   { typebits = 0; }
 855         |  COPY    { typebits = 0; }
 856         |  INFO    { typebits = 0; }
 857         |  OVERLAY { typebits = 0; }
 858         | { typebits = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; }
 859         ;
 860
 861
 862 opt_exp_with_type:
 863                 exp ':'                 { $$ = $1; typebits =0;}
 864         |       exp '(' type ')' ':'    { $$ = $1; }
 865         |       ':'                     { $$= (etree_type *)NULL; typebits = 0; }
 866         |       '(' type ')' ':'        { $$= (etree_type *)NULL;  }
 867         ;
 868
 869 memspec_opt:
 870                 '>' NAME
 871                 { $$ = $2; }
 872         |       { $$ = "*default*"; }
 873         ;
 874 %%
 875 void
 876 yyerror(arg)
 877 char *arg;
 878 {
 879   if (error_index> 0  && error_index < ERROR_NAME_MAX)
 880      einfo("%P%F: %S syntax error in %s\n",error_names[error_index-1]);
 881   else
 882      einfo("%P%F: %S syntax error\n");
 883 }