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 "ldsym.h"
  38 #include "ldmain.h"
  39 #include "mri.h"
  40 #include "ldlex.h"
  41
  42 #define YYDEBUG 1
  43
  44 static int typebits;
  45 strip_symbols_type strip_symbols=STRIP_NONE;
  46 discard_locals_type discard_locals=DISCARD_NONE;
  47
  48 static char *dirlist_ptr;
  49
  50 lang_memory_region_type *region;
  51
  52
  53 char *current_file;
  54 boolean ldgram_want_filename = true;
  55 boolean had_script = false;
  56 boolean force_make_executable = false;
  57
  58 boolean ldgram_in_script = false;
  59 boolean ldgram_had_equals = false;
  60
  61
  62 #define ERROR_NAME_MAX 20
  63 static char *error_names[ERROR_NAME_MAX];
  64 static int error_index;
  65 #define PUSH_ERROR(x) if (error_index < ERROR_NAME_MAX) error_names[error_index] = x; error_index++;
  66 #define POP_ERROR()   error_index--;
  67 %}
  68 %union {
  69   bfd_vma integer;
  70   int voidval;
  71   char *name;
  72   int token;
  73   union etree_union *etree;
  74   struct sec *section;
  75   struct lang_output_section_statement_struct *output_section_statement;
  76   union  lang_statement_union **statement_ptr;
  77   int lineno;
  78   struct {
  79     FILE *file;
  80     char *name;
  81     unsigned int lineno;
  82   } state;
  83
  84
  85 }
  86
  87 %type <etree> exp  opt_exp_with_type  mustbe_exp opt_at
  88 %type <integer> fill_opt
  89 %type <name> memspec_opt
  90 %token <integer> INT
  91 %token <name> NAME
  92 %type  <integer> length
  93
  94 %right <token> PLUSEQ MINUSEQ MULTEQ DIVEQ  '=' LSHIFTEQ RSHIFTEQ   ANDEQ OREQ
  95 %right <token> '?' ':'
  96 %left <token> OROR
  97 %left <token>  ANDAND
  98 %left <token> '|'
  99 %left <token>  '^'
 100 %left  <token> '&'
 101 %left <token>  EQ NE
 102 %left  <token> '<' '>' LE GE
 103 %left  <token> LSHIFT RSHIFT
 104
 105 %left  <token> '+' '-'
 106 %left  <token> '*' '/' '%'
 107
 108 /*%token <token> '+' '-' '*' '/' '%'*/
 109 %right UNARY
 110 %token END
 111 %left <token> '('
 112 %token <token> ALIGN_K BLOCK LONG SHORT BYTE
 113 %token SECTIONS
 114 %token '{' '}'
 115 %token SIZEOF_HEADERS OUTPUT_FORMAT FORCE_COMMON_ALLOCATION OUTPUT_ARCH
 116 %token SIZEOF_HEADERS
 117 %token INCLUDE
 118 %token MEMORY  DEFSYMEND
 119 %token NOLOAD DSECT COPY INFO OVERLAY
 120 %token NAME DEFINED TARGET_K SEARCH_DIR MAP ENTRY
 121 %token OPTION_e OPTION_c OPTION_noinhibit_exec OPTION_s OPTION_S OPTION_sort_common OPTION_warn_common
 122 %token OPTION_EB OPTION_EL OPTION_G OPTION_Gval OPTION_help
 123 %token OPTION_format OPTION_oformat  OPTION_F OPTION_u OPTION_Bstatic OPTION_N
 124 %token <integer> SIZEOF NEXT ADDR
 125 %token OPTION_d OPTION_dc OPTION_dp OPTION_x OPTION_X OPTION_defsym
 126 %token OPTION_v OPTION_V OPTION_m OPTION_memul OPTION_M OPTION_t STARTUP HLL SYSLIB FLOAT  NOFLOAT
 127 %token OPTION_L OPTION_Map
 128 %token OPTION_n OPTION_r OPTION_o OPTION_b  OPTION_R OPTION_relax OPTION_version
 129 %token <name> OPTION_l OPTION_Lfile OPTION_T OPTION_Aarch OPTION_Tfile
 130 %token <name> OPTION_Texp OPTION_y
 131 %token OPTION_Ur
 132 %token ORIGIN FILL OPTION_g
 133 %token LENGTH    CREATE_OBJECT_SYMBOLS INPUT OUTPUT  CONSTRUCTORS
 134 %token OPTION_RETAIN_SYMBOLS_FILE ALIGNMOD AT
 135 %token OPTION_Qy OPTION_Y OPTION_dn OPTION_call_shared OPTION_non_shared
 136 %token OPTION_Oval
 137 %token <name> OPTION_YP
 138
 139 %type <token> assign_op
 140
 141 %type <name>  filename
 142
 143
 144 %token CHIP LIST SECT ABSOLUTE  LOAD NEWLINE ENDWORD ORDER NAMEWORD
 145 %token FORMAT PUBLIC DEFSYMEND BASE ALIAS TRUNCATE
 146
 147 %%
 148
 149 file:   command_line  { lang_final(); };
 150
 151
 152 filename:  NAME;
 153
 154
 155 command_line:
 156                 command_line command_line_option
 157         |
 158         ;
 159
 160 command_line_option:
 161                 OPTION_Bstatic { }
 162         |       OPTION_help
 163                         {
 164                         help ();
 165                         exit (0);
 166                         }
 167         |       OPTION_v
 168                         {
 169                         ldversion(0);
 170                         }
 171         |       OPTION_V
 172                         {
 173                         ldversion(1);
 174                         trace_file_tries = true;
 175                         }
 176         |       OPTION_version
 177                         {
 178                         ldversion(0);
 179                         exit(0);
 180                         }
 181         |       OPTION_t {
 182                         trace_files = true;
 183                         }
 184         |     OPTION_Map  NAME
 185                 {
 186                 write_map = true;
 187                 config.map_filename = $2;
 188                 }
 189         |       OPTION_m NAME
 190                 {
 191                   /* Ignore.  */
 192                 }
 193         |       OPTION_memul
 194                 {
 195                   /* Ignore.  */
 196                 }
 197         |       OPTION_M
 198                 {
 199                   config.map_filename = "-";
 200                 }
 201         |       OPTION_n {
 202                         config.magic_demand_paged = false;
 203                         }
 204         |       OPTION_N {
 205                         config.text_read_only = false;
 206                         config.magic_demand_paged = false;
 207                         }
 208         |       OPTION_s {
 209                         strip_symbols = STRIP_ALL;
 210                         }
 211         |       OPTION_S {
 212                         strip_symbols = STRIP_DEBUGGER;
 213                         }
 214         |       OPTION_u NAME {
 215                         ldlang_add_undef($2);
 216                 }
 217
 218         |       OPTION_r {
 219                         config.relocateable_output = true;
 220                         config.build_constructors = false;
 221                         config.magic_demand_paged = false;
 222                         config.text_read_only = false;
 223                         }
 224         |       OPTION_Ur {
 225                         config.relocateable_output = true;
 226                         config.build_constructors = true;
 227                         config.magic_demand_paged = false;
 228                         config.text_read_only = false;
 229                       }
 230         |       OPTION_o filename
 231                         {
 232                         lang_add_output($2, 0);
 233                         }
 234         |       OPTION_e NAME
 235                         { lang_add_entry($2);
 236                         }
 237         |       OPTION_X {
 238                         discard_locals = DISCARD_L;
 239                 }
 240         |       OPTION_x {
 241                         discard_locals = DISCARD_ALL;
 242                 }
 243
 244         |       OPTION_noinhibit_exec
 245                         {
 246                         force_make_executable = true;
 247                         }
 248         |      OPTION_sort_common
 249                         {
 250                         config.sort_common = true;
 251                         }
 252         |      OPTION_warn_common
 253                         {
 254                         config.warn_common = true;
 255                         }
 256         |      OPTION_d {
 257                           command_line.force_common_definition = true;
 258                         }
 259
 260         |      OPTION_relax {
 261                           command_line.relax = true;
 262                         }
 263         |      OPTION_dc
 264                          {
 265                           command_line.force_common_definition = true;
 266                         }
 267         |       OPTION_g
 268                         {
 269                         /* Ignored */
 270                         }
 271         |       OPTION_dp
 272                          {
 273                           command_line.force_common_definition = true;
 274                         }
 275         |       OPTION_format NAME
 276                    {
 277                           lang_add_target($2);
 278                    }
 279         |       OPTION_oformat NAME
 280                    {
 281                           lang_add_output_format($2, 0);
 282                    }
 283         |       OPTION_Texp
 284                 { ldlex_expression();
 285                         hex_mode  = 16;
 286                 }
 287                 INT
 288                 {  ldlex_popstate();
 289                         lang_section_start($1,exp_intop($3));
 290                         hex_mode = 0;
 291                 }
 292         |       OPTION_y
 293                         {
 294                         add_ysym($1);
 295                         }
 296         |       OPTION_Aarch
 297                 {
 298                         ldfile_add_arch($1);
 299                 }
 300         |        OPTION_b NAME
 301                         {
 302                         lang_add_target($2);
 303                         }
 304         |       OPTION_L NAME
 305                         {
 306                         ldfile_add_library_path($2);
 307                         }
 308         |       OPTION_Lfile
 309                         {
 310                         ldfile_add_library_path($1);
 311                         }
 312         |       OPTION_F
 313                 {
 314                 /* Ignore */
 315                 }
 316         |       OPTION_c filename
 317                         {ldfile_open_command_file($2); }
 318                 mri_script_file  END {  ldlex_command();}
 319
 320         |       OPTION_Tfile
 321                         { ldfile_open_command_file($1); } script_file
 322                         END {  ldlex_command();}
 323
 324         |       OPTION_T filename
 325                         { ldfile_open_command_file($2); } script_file
 326                 END {  ldlex_command();}
 327
 328         |       OPTION_l
 329                         {
 330                           lang_add_input_file($1,
 331                                          lang_input_file_is_l_enum,
 332                                          (char *)NULL);
 333                         }
 334         |       OPTION_R filename
 335                         {
 336                         lang_add_input_file($2,
 337                                 lang_input_file_is_symbols_only_enum,
 338                                 (char *)NULL);
 339                         }
 340
 341         |       OPTION_defsym  { ldlex_defsym(); }
 342                 NAME     '=' exp  DEFSYMEND { ldlex_popstate();
 343                         lang_add_assignment(exp_assop($4,$3,$5));
 344                         }
 345         |       OPTION_RETAIN_SYMBOLS_FILE filename
 346                 { lang_add_keepsyms_file ($2); }
 347         |       OPTION_EB
 348                 {
 349                   /* FIXME: This is currently ignored.  It means
 350                      ``produce a big-endian object file''.  It could
 351                      be used to select an output format.  */
 352                 }
 353         |       OPTION_EL
 354                 {
 355                   /* FIXME: This is currently ignored.  It means
 356                      ``produce a little-endian object file''.  It could
 357                      be used to select an output format.  */
 358                 }
 359         |       OPTION_G NAME
 360                 {
 361                   g_switch_value = atoi ($2);
 362                 }
 363         |       OPTION_Gval
 364                 {
 365                   g_switch_value = yylval.integer;
 366                 }
 367         |       OPTION_Qy
 368         |       OPTION_dn
 369         |       OPTION_non_shared
 370         |       OPTION_call_shared
 371         |       OPTION_Oval
 372         |       OPTION_YP
 373                 {
 374                   dirlist_ptr = $1;
 375                   goto set_default_dirlist;
 376                 }
 377         |       OPTION_Y NAME
 378                 {
 379                   if (strncmp ($2, "P,", 2))
 380                     einfo ("%P%F: unknown -Y option -- %s\n", $2);
 381                   else
 382                     {
 383                       char *p = "";
 384                       dirlist_ptr = $2;
 385                     set_default_dirlist:
 386                       while (p != 0)
 387                         {
 388                           p = strchr (dirlist_ptr, ':');
 389                           if (p)
 390                             *p = 0;
 391                           if (*dirlist_ptr)
 392                             ldfile_add_library_path (dirlist_ptr);
 393                           if (p)
 394                             {
 395                               *p = ':';
 396                               dirlist_ptr = p + 1;
 397                             }
 398                         }
 399                     }
 400                 }
 401         |       '{' script_file '}' { /* This parses compiled-in scripts.  */ }
 402         |       NAME
 403                 {
 404                   if (*$1 == '-')
 405                     einfo("%P%F: illegal option -- %s\n", $1);
 406                   else
 407                     lang_add_input_file($1,lang_input_file_is_file_enum,
 408                                         (char *)NULL);
 409                 }
 410         ;
 411
 412
 413 /* SYNTAX WITHIN AN MRI SCRIPT FILE */
 414 mri_script_file:
 415                 {       ldlex_mri_script();
 416                         PUSH_ERROR("MRI style script");
 417                 }
 418              mri_script_lines
 419                 {       ldlex_popstate();
 420                         POP_ERROR();
 421                 }
 422         ;
 423
 424 mri_script_lines:
 425                 mri_script_lines mri_script_command NEWLINE
 426           |
 427         ;
 428
 429 mri_script_command:
 430                 CHIP  exp
 431         |       CHIP  exp ',' exp
 432         |       NAME    {
 433                         einfo("%P%F: unrecognised keyword in MRI style script '%s'\n",$1);
 434                         }
 435         |       LIST    {
 436                         write_map = true;
 437                         config.map_filename = "-";
 438                         }
 439         |       ORDER ordernamelist
 440         |       ENDWORD
 441         |       PUBLIC NAME '=' exp
 442                         { mri_public($2, $4); }
 443         |       PUBLIC NAME ',' exp
 444                         { mri_public($2, $4); }
 445         |       PUBLIC NAME  exp
 446                         { mri_public($2, $3); }
 447         |       FORMAT NAME
 448                         { mri_format($2); }
 449         |       SECT NAME ',' exp
 450                         { mri_output_section($2, $4);}
 451         |       SECT NAME  exp
 452                         { mri_output_section($2, $3);}
 453         |       SECT NAME '=' exp
 454                         { mri_output_section($2, $4);}
 455         |       ALIGN_K NAME '=' exp
 456                         { mri_align($2,$4); }
 457         |       ALIGNMOD NAME '=' exp
 458                         { mri_alignmod($2,$4); }
 459         |       ABSOLUTE mri_abs_name_list
 460         |       LOAD     mri_load_name_list
 461         |       NAMEWORD NAME
 462                         { mri_name($2); }
 463         |       ALIAS NAME ',' NAME
 464                         { mri_alias($2,$4,0);}
 465         |       ALIAS NAME ',' INT
 466                         { mri_alias($2,0,$4);}
 467         |       BASE     exp
 468                         { mri_base($2); }
 469         |       TRUNCATE INT
 470                 {  mri_truncate($2); }
 471         |
 472         ;
 473
 474 ordernamelist:
 475               ordernamelist ',' NAME         { mri_order($3); }
 476         |     ordernamelist  NAME         { mri_order($2); }
 477         |
 478         ;
 479
 480 mri_load_name_list:
 481                 NAME
 482                         { mri_load($1); }
 483         |       mri_load_name_list ',' NAME { mri_load($3); }
 484         ;
 485
 486 mri_abs_name_list:
 487                 NAME
 488                         { mri_only_load($1); }
 489         |       mri_abs_name_list ','  NAME
 490                         { mri_only_load($3); }
 491         ;
 492
 493 script_file:
 494         {
 495          ldlex_both();
 496         }
 497        ifile_list
 498         {
 499         ldlex_popstate();
 500         }
 501         ;
 502
 503
 504 ifile_list:
 505        ifile_list ifile_p1
 506         |
 507         ;
 508
 509
 510
 511 ifile_p1:
 512                 memory
 513         |       sections
 514         |       startup
 515         |       high_level_library
 516         |       low_level_library
 517         |       floating_point_support
 518         |       statement_anywhere
 519         |        ';'
 520         |       TARGET_K '(' NAME ')'
 521                 { lang_add_target($3); }
 522         |       SEARCH_DIR '(' filename ')'
 523                 { ldfile_add_library_path($3); }
 524         |       OUTPUT '(' filename ')'
 525                 { lang_add_output($3, 1); }
 526         |       OUTPUT_FORMAT '(' NAME ')'
 527                   { lang_add_output_format($3, 1); }
 528         |       OUTPUT_ARCH '(' NAME ')'
 529                   { ldfile_set_output_arch($3); }
 530         |       FORCE_COMMON_ALLOCATION
 531                 { command_line.force_common_definition = true ; }
 532         |       INPUT '(' input_list ')'
 533         |       MAP '(' filename ')'
 534                 { lang_add_map($3); }
 535         |       INCLUDE filename
 536                 { ldfile_open_command_file($2); } ifile_list END
 537         ;
 538
 539 input_list:
 540                 NAME
 541                 { lang_add_input_file($1,lang_input_file_is_search_file_enum,
 542                                  (char *)NULL); }
 543         |       input_list ',' NAME
 544                 { lang_add_input_file($3,lang_input_file_is_search_file_enum,
 545                                  (char *)NULL); }
 546         |       input_list NAME
 547                 { lang_add_input_file($2,lang_input_file_is_search_file_enum,
 548                                  (char *)NULL); }
 549         ;
 550
 551 sections:
 552                 SECTIONS '{' sec_or_group_p1 '}'
 553         ;
 554
 555 sec_or_group_p1:
 556                 sec_or_group_p1 section
 557         |       sec_or_group_p1 statement_anywhere
 558         |
 559         ;
 560
 561 statement_anywhere:
 562                 ENTRY '(' NAME ')'
 563                 { lang_add_entry($3); }
 564         |       assignment end
 565         ;
 566
 567 file_NAME_list:
 568                 NAME
 569                         { lang_add_wild($1, current_file); }
 570         |       file_NAME_list opt_comma NAME
 571                         { lang_add_wild($3, current_file); }
 572         ;
 573
 574 input_section_spec:
 575                 NAME
 576                 {
 577                 lang_add_wild((char *)NULL, $1);
 578                 }
 579         |       '['
 580                         {
 581                         current_file = (char *)NULL;
 582                         }
 583                         file_NAME_list
 584                 ']'
 585         |       NAME
 586                         {
 587                         current_file =$1;
 588                         }
 589                 '(' file_NAME_list ')'
 590         |       '*'
 591                         {
 592                         current_file = (char *)NULL;
 593                         }
 594                 '(' file_NAME_list ')'
 595         ;
 596
 597 statement:
 598                 assignment end
 599         |       CREATE_OBJECT_SYMBOLS
 600                 {
 601                 lang_add_attribute(lang_object_symbols_statement_enum);
 602                 }
 603         |       ';'
 604         |       CONSTRUCTORS
 605                 {
 606
 607                   lang_add_attribute(lang_constructors_statement_enum);
 608                 }
 609         | input_section_spec
 610         | length '(' exp ')'
 611                         {
 612                         lang_add_data($1,$3);
 613                         }
 614
 615         | FILL '(' exp ')'
 616                         {
 617                           lang_add_fill
 618                             (exp_get_value_int($3,
 619                                                0,
 620                                                "fill value",
 621                                                lang_first_phase_enum));
 622                         }
 623         ;
 624
 625 statement_list:
 626                 statement_list statement
 627         |       statement
 628         ;
 629
 630 statement_list_opt:
 631                 /* empty */
 632         |       statement_list
 633         ;
 634
 635 length:
 636                 LONG
 637                         { $$ = $1; }
 638         |       SHORT
 639                         { $$ = $1; }
 640         |       BYTE
 641                         { $$ = $1; }
 642         ;
 643
 644 fill_opt:
 645           '=' mustbe_exp
 646                 {
 647                   $$ =   exp_get_value_int($2,
 648                                            0,
 649                                            "fill value",
 650                                            lang_first_phase_enum);
 651                 }
 652         |       { $$ = 0; }
 653         ;
 654
 655
 656
 657 assign_op:
 658                 PLUSEQ
 659                         { $$ = '+'; }
 660         |       MINUSEQ
 661                         { $$ = '-'; }
 662         |       MULTEQ
 663                         { $$ = '*'; }
 664         |       DIVEQ
 665                         { $$ = '/'; }
 666         |       LSHIFTEQ
 667                         { $$ = LSHIFT; }
 668         |       RSHIFTEQ
 669                         { $$ = RSHIFT; }
 670         |       ANDEQ
 671                         { $$ = '&'; }
 672         |       OREQ
 673                         { $$ = '|'; }
 674
 675         ;
 676
 677 end:    ';' | ','
 678         ;
 679
 680
 681 assignment:
 682                 NAME '=' mustbe_exp
 683                 {
 684                   lang_add_assignment(exp_assop($2,$1,$3));
 685                 }
 686         |       NAME assign_op mustbe_exp
 687                 {
 688
 689 lang_add_assignment(exp_assop('=',$1,exp_binop($2,exp_nameop(NAME,$1),$3)));
 690                 }
 691
 692         ;
 693
 694
 695 opt_comma:
 696                 ','     |       ;
 697
 698
 699 memory:
 700                 MEMORY '{' memory_spec memory_spec_list '}'
 701         ;
 702
 703 memory_spec_list:
 704                 memory_spec_list memory_spec
 705         |       memory_spec_list ',' memory_spec
 706         |
 707         ;
 708
 709
 710 memory_spec:            NAME
 711                         { region = lang_memory_region_lookup($1); }
 712                 attributes_opt ':'
 713                 origin_spec opt_comma length_spec
 714
 715         ; origin_spec:
 716         ORIGIN '=' mustbe_exp
 717                 { region->current =
 718                  region->origin =
 719                  exp_get_vma($3, 0L,"origin", lang_first_phase_enum);
 720 }
 721         ; length_spec:
 722              LENGTH '=' mustbe_exp
 723                { region->length = exp_get_vma($3,
 724                                                ~((bfd_vma)0),
 725                                                "length",
 726                                                lang_first_phase_enum);
 727                 }
 728
 729
 730 attributes_opt:
 731                   '(' NAME ')'
 732                         {
 733                         lang_set_flags(&region->flags, $2);
 734                         }
 735         |
 736
 737         ;
 738
 739 startup:
 740         STARTUP '(' filename ')'
 741                 { lang_startup($3); }
 742         ;
 743
 744 high_level_library:
 745                 HLL '(' high_level_library_NAME_list ')'
 746         |       HLL '(' ')'
 747                         { ldemul_hll((char *)NULL); }
 748         ;
 749
 750 high_level_library_NAME_list:
 751                 high_level_library_NAME_list opt_comma filename
 752                         { ldemul_hll($3); }
 753         |       filename
 754                         { ldemul_hll($1); }
 755
 756         ;
 757
 758 low_level_library:
 759         SYSLIB '(' low_level_library_NAME_list ')'
 760         ; low_level_library_NAME_list:
 761                 low_level_library_NAME_list opt_comma filename
 762                         { ldemul_syslib($3); }
 763         |
 764         ;
 765
 766 floating_point_support:
 767                 FLOAT
 768                         { lang_float(true); }
 769         |       NOFLOAT
 770                         { lang_float(false); }
 771         ;
 772
 773
 774 mustbe_exp:              { ldlex_expression(); }
 775                 exp
 776                          { ldlex_popstate(); $$=$2;}
 777         ;
 778
 779 exp     :
 780                 '-' exp %prec UNARY
 781                         { $$ = exp_unop('-', $2); }
 782         |       '(' exp ')'
 783                         { $$ = $2; }
 784         |       NEXT '(' exp ')' %prec UNARY
 785                         { $$ = exp_unop($1,$3); }
 786         |       '!' exp %prec UNARY
 787                         { $$ = exp_unop('!', $2); }
 788         |       '+' exp %prec UNARY
 789                         { $$ = $2; }
 790         |       '~' exp %prec UNARY
 791                         { $$ = exp_unop('~', $2);}
 792
 793         |       exp '*' exp
 794                         { $$ = exp_binop('*', $1, $3); }
 795         |       exp '/' exp
 796                         { $$ = exp_binop('/', $1, $3); }
 797         |       exp '%' exp
 798                         { $$ = exp_binop('%', $1, $3); }
 799         |       exp '+' exp
 800                         { $$ = exp_binop('+', $1, $3); }
 801         |       exp '-' exp
 802                         { $$ = exp_binop('-' , $1, $3); }
 803         |       exp LSHIFT exp
 804                         { $$ = exp_binop(LSHIFT , $1, $3); }
 805         |       exp RSHIFT exp
 806                         { $$ = exp_binop(RSHIFT , $1, $3); }
 807         |       exp EQ exp
 808                         { $$ = exp_binop(EQ , $1, $3); }
 809         |       exp NE exp
 810                         { $$ = exp_binop(NE , $1, $3); }
 811         |       exp LE exp
 812                         { $$ = exp_binop(LE , $1, $3); }
 813         |       exp GE exp
 814                         { $$ = exp_binop(GE , $1, $3); }
 815         |       exp '<' exp
 816                         { $$ = exp_binop('<' , $1, $3); }
 817         |       exp '>' exp
 818                         { $$ = exp_binop('>' , $1, $3); }
 819         |       exp '&' exp
 820                         { $$ = exp_binop('&' , $1, $3); }
 821         |       exp '^' exp
 822                         { $$ = exp_binop('^' , $1, $3); }
 823         |       exp '|' exp
 824                         { $$ = exp_binop('|' , $1, $3); }
 825         |       exp '?' exp ':' exp
 826                         { $$ = exp_trinop('?' , $1, $3, $5); }
 827         |       exp ANDAND exp
 828                         { $$ = exp_binop(ANDAND , $1, $3); }
 829         |       exp OROR exp
 830                         { $$ = exp_binop(OROR , $1, $3); }
 831         |       DEFINED '(' NAME ')'
 832                         { $$ = exp_nameop(DEFINED, $3); }
 833         |       INT
 834                         { $$ = exp_intop($1); }
 835         |       SIZEOF_HEADERS
 836                         { $$ = exp_nameop(SIZEOF_HEADERS,0); }
 837
 838         |       SIZEOF '(' NAME ')'
 839                         { $$ = exp_nameop(SIZEOF,$3); }
 840         |       ADDR '(' NAME ')'
 841                         { $$ = exp_nameop(ADDR,$3); }
 842         |       ABSOLUTE '(' exp ')'
 843                         { $$ = exp_unop(ABSOLUTE, $3); }
 844         |       ALIGN_K '(' exp ')'
 845                         { $$ = exp_unop(ALIGN_K,$3); }
 846         |       NAME
 847                         { $$ = exp_nameop(NAME,$1); }
 848         ;
 849
 850
 851 opt_at:
 852                 AT '(' exp ')' { $$ = $3; }
 853         |       { $$ = 0; }
 854         ;
 855
 856 section:        NAME            { ldlex_expression(); }
 857                 opt_exp_with_type
 858                 opt_at          { ldlex_popstate(); }
 859                 '{'
 860                         {
 861                         lang_enter_output_section_statement($1,$3,typebits,0,0,0,$4);
 862                         }
 863                 statement_list_opt
 864                 '}' {ldlex_expression();} fill_opt memspec_opt
 865                 {
 866                   ldlex_popstate();
 867                   lang_leave_output_section_statement($11, $12);
 868                 }
 869 opt_comma
 870
 871         ;
 872
 873 type:
 874            NOLOAD  { typebits = SEC_NEVER_LOAD; }
 875         |  DSECT   { typebits = 0; }
 876         |  COPY    { typebits = 0; }
 877         |  INFO    { typebits = 0; }
 878         |  OVERLAY { typebits = 0; }
 879         | { typebits = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; }
 880         ;
 881
 882
 883 opt_exp_with_type:
 884                 exp ':'                 { $$ = $1; typebits =0;}
 885         |       exp '(' type ')' ':'    { $$ = $1; }
 886         |       ':'                     { $$= (etree_type *)NULL; typebits = 0; }
 887         |       '(' type ')' ':'        { $$= (etree_type *)NULL;  }
 888         ;
 889
 890 memspec_opt:
 891                 '>' NAME
 892                 { $$ = $2; }
 893         |       { $$ = "*default*"; }
 894         ;
 895 %%
 896 void
 897 yyerror(arg)
 898 char *arg;
 899 {
 900   if (error_index> 0  && error_index < ERROR_NAME_MAX)
 901      einfo("%P%F: %S syntax error in %s\n",error_names[error_index-1]);
 902   else
 903      einfo("%P%F: %S syntax error\n");
 904 }