ld/ldgram.y

   1 /* A YACC grammer to parse a superset of the AT&T linker scripting languaue.
   2    Copyright (C) 1991, 1993 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 "bfdlink.h"
  31 #include "ld.h"
  32 #include "ldexp.h"
  33 #include "ldver.h"
  34 #include "ldlang.h"
  35 #include "ldemul.h"
  36 #include "ldfile.h"
  37 #include "ldmisc.h"
  38 #include "ldmain.h"
  39 #include "mri.h"
  40 #include "ldlex.h"
  41
  42 #define YYDEBUG 1
  43
  44 static int typebits;
  45
  46 lang_memory_region_type *region;
  47
  48
  49 char *current_file;
  50 boolean ldgram_want_filename = true;
  51 boolean had_script = false;
  52 boolean force_make_executable = false;
  53
  54 boolean ldgram_in_script = false;
  55 boolean ldgram_had_equals = false;
  56
  57
  58 #define ERROR_NAME_MAX 20
  59 static char *error_names[ERROR_NAME_MAX];
  60 static int error_index;
  61 #define PUSH_ERROR(x) if (error_index < ERROR_NAME_MAX) error_names[error_index] = x; error_index++;
  62 #define POP_ERROR()   error_index--;
  63 %}
  64 %union {
  65   bfd_vma integer;
  66   char *name;
  67   int token;
  68   union etree_union *etree;
  69 }
  70
  71 %type <etree> exp  opt_exp_with_type  mustbe_exp opt_at
  72 %type <integer> fill_opt
  73 %type <name> memspec_opt
  74 %token <integer> INT
  75 %token <name> NAME
  76 %type  <integer> length
  77
  78 %right <token> PLUSEQ MINUSEQ MULTEQ DIVEQ  '=' LSHIFTEQ RSHIFTEQ   ANDEQ OREQ
  79 %right <token> '?' ':'
  80 %left <token> OROR
  81 %left <token>  ANDAND
  82 %left <token> '|'
  83 %left <token>  '^'
  84 %left  <token> '&'
  85 %left <token>  EQ NE
  86 %left  <token> '<' '>' LE GE
  87 %left  <token> LSHIFT RSHIFT
  88
  89 %left  <token> '+' '-'
  90 %left  <token> '*' '/' '%'
  91
  92 %right UNARY
  93 %token END
  94 %left <token> '('
  95 %token <token> ALIGN_K BLOCK QUAD LONG SHORT BYTE
  96 %token SECTIONS
  97 %token '{' '}'
  98 %token SIZEOF_HEADERS OUTPUT_FORMAT FORCE_COMMON_ALLOCATION OUTPUT_ARCH
  99 %token SIZEOF_HEADERS
 100 %token INCLUDE
 101 %token MEMORY DEFSYMEND
 102 %token NOLOAD DSECT COPY INFO OVERLAY
 103 %token NAME DEFINED TARGET_K SEARCH_DIR MAP ENTRY
 104 %token <integer> SIZEOF NEXT ADDR
 105 %token STARTUP HLL SYSLIB FLOAT NOFLOAT
 106 %token ORIGIN FILL
 107 %token LENGTH CREATE_OBJECT_SYMBOLS INPUT OUTPUT CONSTRUCTORS
 108 %token ALIGNMOD AT
 109 %type <token> assign_op
 110 %type <name>  filename
 111 %token CHIP LIST SECT ABSOLUTE  LOAD NEWLINE ENDWORD ORDER NAMEWORD
 112 %token FORMAT PUBLIC DEFSYMEND BASE ALIAS TRUNCATE REL
 113 %token INPUT_SCRIPT INPUT_MRI_SCRIPT INPUT_DEFSYM
 114
 115 %%
 116
 117 file:
 118                 INPUT_SCRIPT script_file
 119         |       INPUT_MRI_SCRIPT mri_script_file
 120         |       INPUT_DEFSYM defsym_expr
 121         ;
 122
 123
 124 filename:  NAME;
 125
 126
 127 defsym_expr:
 128                 { ldlex_defsym(); }
 129                 NAME '=' exp
 130                 {
 131                   ldlex_popstate();
 132                   lang_add_assignment(exp_assop($3,$2,$4));
 133                 }
 134
 135 /* SYNTAX WITHIN AN MRI SCRIPT FILE */
 136 mri_script_file:
 137                 {       ldlex_mri_script();
 138                         PUSH_ERROR("MRI style script");
 139                 }
 140              mri_script_lines
 141                 {       ldlex_popstate();
 142                         POP_ERROR();
 143                 }
 144         ;
 145
 146 mri_script_lines:
 147                 mri_script_lines mri_script_command NEWLINE
 148           |
 149         ;
 150
 151 mri_script_command:
 152                 CHIP  exp
 153         |       CHIP  exp ',' exp
 154         |       NAME    {
 155                         einfo("%P%F: unrecognised keyword in MRI style script '%s'\n",$1);
 156                         }
 157         |       LIST    {
 158                         write_map = true;
 159                         config.map_filename = "-";
 160                         }
 161         |       ORDER ordernamelist
 162         |       ENDWORD
 163         |       PUBLIC NAME '=' exp
 164                         { mri_public($2, $4); }
 165         |       PUBLIC NAME ',' exp
 166                         { mri_public($2, $4); }
 167         |       PUBLIC NAME  exp
 168                         { mri_public($2, $3); }
 169         |       FORMAT NAME
 170                         { mri_format($2); }
 171         |       SECT NAME ',' exp
 172                         { mri_output_section($2, $4);}
 173         |       SECT NAME  exp
 174                         { mri_output_section($2, $3);}
 175         |       SECT NAME '=' exp
 176                         { mri_output_section($2, $4);}
 177         |       ALIGN_K NAME '=' exp
 178                         { mri_align($2,$4); }
 179         |       ALIGNMOD NAME '=' exp
 180                         { mri_alignmod($2,$4); }
 181         |       ABSOLUTE mri_abs_name_list
 182         |       LOAD     mri_load_name_list
 183         |       NAMEWORD NAME
 184                         { mri_name($2); }
 185         |       ALIAS NAME ',' NAME
 186                         { mri_alias($2,$4,0);}
 187         |       ALIAS NAME ',' INT
 188                         { mri_alias($2,0,(int) $4);}
 189         |       BASE     exp
 190                         { mri_base($2); }
 191         |       TRUNCATE INT
 192                 {  mri_truncate((unsigned int) $2); }
 193         |
 194         ;
 195
 196 ordernamelist:
 197               ordernamelist ',' NAME         { mri_order($3); }
 198         |     ordernamelist  NAME         { mri_order($2); }
 199         |
 200         ;
 201
 202 mri_load_name_list:
 203                 NAME
 204                         { mri_load($1); }
 205         |       mri_load_name_list ',' NAME { mri_load($3); }
 206         ;
 207
 208 mri_abs_name_list:
 209                 NAME
 210                         { mri_only_load($1); }
 211         |       mri_abs_name_list ','  NAME
 212                         { mri_only_load($3); }
 213         ;
 214
 215 script_file:
 216         {
 217          ldlex_both();
 218         }
 219        ifile_list
 220         {
 221         ldlex_popstate();
 222         }
 223         ;
 224
 225
 226 ifile_list:
 227        ifile_list ifile_p1
 228         |
 229         ;
 230
 231
 232
 233 ifile_p1:
 234                 memory
 235         |       sections
 236         |       startup
 237         |       high_level_library
 238         |       low_level_library
 239         |       floating_point_support
 240         |       statement_anywhere
 241         |        ';'
 242         |       TARGET_K '(' NAME ')'
 243                 { lang_add_target($3); }
 244         |       SEARCH_DIR '(' filename ')'
 245                 { ldfile_add_library_path($3); }
 246         |       OUTPUT '(' filename ')'
 247                 { lang_add_output($3, 1); }
 248         |       OUTPUT_FORMAT '(' NAME ')'
 249                   { lang_add_output_format($3, 1); }
 250         |       OUTPUT_ARCH '(' NAME ')'
 251                   { ldfile_set_output_arch($3); }
 252         |       FORCE_COMMON_ALLOCATION
 253                 { command_line.force_common_definition = true ; }
 254         |       INPUT '(' input_list ')'
 255         |       MAP '(' filename ')'
 256                 { lang_add_map($3); }
 257         |       INCLUDE filename
 258                 { ldfile_open_command_file($2); } ifile_list END
 259         ;
 260
 261 input_list:
 262                 NAME
 263                 { lang_add_input_file($1,lang_input_file_is_search_file_enum,
 264                                  (char *)NULL); }
 265         |       input_list ',' NAME
 266                 { lang_add_input_file($3,lang_input_file_is_search_file_enum,
 267                                  (char *)NULL); }
 268         |       input_list NAME
 269                 { lang_add_input_file($2,lang_input_file_is_search_file_enum,
 270                                  (char *)NULL); }
 271         ;
 272
 273 sections:
 274                 SECTIONS '{' sec_or_group_p1 '}'
 275         ;
 276
 277 sec_or_group_p1:
 278                 sec_or_group_p1 section
 279         |       sec_or_group_p1 statement_anywhere
 280         |
 281         ;
 282
 283 statement_anywhere:
 284                 ENTRY '(' NAME ')'
 285                 { lang_add_entry($3); }
 286         |       assignment end
 287         ;
 288
 289 file_NAME_list:
 290                 NAME
 291                         { lang_add_wild($1, current_file); }
 292         |       file_NAME_list opt_comma NAME
 293                         { lang_add_wild($3, current_file); }
 294         ;
 295
 296 input_section_spec:
 297                 NAME
 298                 {
 299                 lang_add_wild((char *)NULL, $1);
 300                 }
 301         |       '['
 302                         {
 303                         current_file = (char *)NULL;
 304                         }
 305                         file_NAME_list
 306                 ']'
 307         |       NAME
 308                         {
 309                         current_file =$1;
 310                         }
 311                 '(' file_NAME_list ')'
 312         |       '*'
 313                         {
 314                         current_file = (char *)NULL;
 315                         }
 316                 '(' file_NAME_list ')'
 317         ;
 318
 319 statement:
 320                 assignment end
 321         |       CREATE_OBJECT_SYMBOLS
 322                 {
 323                 lang_add_attribute(lang_object_symbols_statement_enum);
 324                 }
 325         |       ';'
 326         |       CONSTRUCTORS
 327                 {
 328
 329                   lang_add_attribute(lang_constructors_statement_enum);
 330                 }
 331         | input_section_spec
 332         | length '(' exp ')'
 333                         {
 334                         lang_add_data((int) $1,$3);
 335                         }
 336
 337         | FILL '(' exp ')'
 338                         {
 339                           lang_add_fill
 340                             (exp_get_value_int($3,
 341                                                0,
 342                                                "fill value",
 343                                                lang_first_phase_enum));
 344                         }
 345         ;
 346
 347 statement_list:
 348                 statement_list statement
 349         |       statement
 350         ;
 351
 352 statement_list_opt:
 353                 /* empty */
 354         |       statement_list
 355         ;
 356
 357 length:
 358                 QUAD
 359                         { $$ = $1; }
 360         |       LONG
 361                         { $$ = $1; }
 362         |       SHORT
 363                         { $$ = $1; }
 364         |       BYTE
 365                         { $$ = $1; }
 366         ;
 367
 368 fill_opt:
 369           '=' mustbe_exp
 370                 {
 371                   $$ =   exp_get_value_int($2,
 372                                            0,
 373                                            "fill value",
 374                                            lang_first_phase_enum);
 375                 }
 376         |       { $$ = 0; }
 377         ;
 378
 379
 380
 381 assign_op:
 382                 PLUSEQ
 383                         { $$ = '+'; }
 384         |       MINUSEQ
 385                         { $$ = '-'; }
 386         |       MULTEQ
 387                         { $$ = '*'; }
 388         |       DIVEQ
 389                         { $$ = '/'; }
 390         |       LSHIFTEQ
 391                         { $$ = LSHIFT; }
 392         |       RSHIFTEQ
 393                         { $$ = RSHIFT; }
 394         |       ANDEQ
 395                         { $$ = '&'; }
 396         |       OREQ
 397                         { $$ = '|'; }
 398
 399         ;
 400
 401 end:    ';' | ','
 402         ;
 403
 404
 405 assignment:
 406                 NAME '=' mustbe_exp
 407                 {
 408                   lang_add_assignment(exp_assop($2,$1,$3));
 409                 }
 410         |       NAME assign_op mustbe_exp
 411                 {
 412
 413 lang_add_assignment(exp_assop('=',$1,exp_binop($2,exp_nameop(NAME,$1),$3)));
 414                 }
 415
 416         ;
 417
 418
 419 opt_comma:
 420                 ','     |       ;
 421
 422
 423 memory:
 424                 MEMORY '{' memory_spec memory_spec_list '}'
 425         ;
 426
 427 memory_spec_list:
 428                 memory_spec_list memory_spec
 429         |       memory_spec_list ',' memory_spec
 430         |
 431         ;
 432
 433
 434 memory_spec:            NAME
 435                         { region = lang_memory_region_lookup($1); }
 436                 attributes_opt ':'
 437                 origin_spec opt_comma length_spec
 438
 439         ; origin_spec:
 440         ORIGIN '=' mustbe_exp
 441                 { region->current =
 442                  region->origin =
 443                  exp_get_vma($3, 0L,"origin", lang_first_phase_enum);
 444 }
 445         ; length_spec:
 446              LENGTH '=' mustbe_exp
 447                { region->length = exp_get_vma($3,
 448                                                ~((bfd_vma)0),
 449                                                "length",
 450                                                lang_first_phase_enum);
 451                 }
 452
 453
 454 attributes_opt:
 455                   '(' NAME ')'
 456                         {
 457                         lang_set_flags(&region->flags, $2);
 458                         }
 459         |
 460
 461         ;
 462
 463 startup:
 464         STARTUP '(' filename ')'
 465                 { lang_startup($3); }
 466         ;
 467
 468 high_level_library:
 469                 HLL '(' high_level_library_NAME_list ')'
 470         |       HLL '(' ')'
 471                         { ldemul_hll((char *)NULL); }
 472         ;
 473
 474 high_level_library_NAME_list:
 475                 high_level_library_NAME_list opt_comma filename
 476                         { ldemul_hll($3); }
 477         |       filename
 478                         { ldemul_hll($1); }
 479
 480         ;
 481
 482 low_level_library:
 483         SYSLIB '(' low_level_library_NAME_list ')'
 484         ; low_level_library_NAME_list:
 485                 low_level_library_NAME_list opt_comma filename
 486                         { ldemul_syslib($3); }
 487         |
 488         ;
 489
 490 floating_point_support:
 491                 FLOAT
 492                         { lang_float(true); }
 493         |       NOFLOAT
 494                         { lang_float(false); }
 495         ;
 496
 497
 498 mustbe_exp:              { ldlex_expression(); }
 499                 exp
 500                          { ldlex_popstate(); $$=$2;}
 501         ;
 502
 503 exp     :
 504                 '-' exp %prec UNARY
 505                         { $$ = exp_unop('-', $2); }
 506         |       '(' exp ')'
 507                         { $$ = $2; }
 508         |       NEXT '(' exp ')' %prec UNARY
 509                         { $$ = exp_unop((int) $1,$3); }
 510         |       '!' exp %prec UNARY
 511                         { $$ = exp_unop('!', $2); }
 512         |       '+' exp %prec UNARY
 513                         { $$ = $2; }
 514         |       '~' exp %prec UNARY
 515                         { $$ = exp_unop('~', $2);}
 516
 517         |       exp '*' exp
 518                         { $$ = exp_binop('*', $1, $3); }
 519         |       exp '/' exp
 520                         { $$ = exp_binop('/', $1, $3); }
 521         |       exp '%' exp
 522                         { $$ = exp_binop('%', $1, $3); }
 523         |       exp '+' exp
 524                         { $$ = exp_binop('+', $1, $3); }
 525         |       exp '-' exp
 526                         { $$ = exp_binop('-' , $1, $3); }
 527         |       exp LSHIFT exp
 528                         { $$ = exp_binop(LSHIFT , $1, $3); }
 529         |       exp RSHIFT exp
 530                         { $$ = exp_binop(RSHIFT , $1, $3); }
 531         |       exp EQ exp
 532                         { $$ = exp_binop(EQ , $1, $3); }
 533         |       exp NE exp
 534                         { $$ = exp_binop(NE , $1, $3); }
 535         |       exp LE exp
 536                         { $$ = exp_binop(LE , $1, $3); }
 537         |       exp GE exp
 538                         { $$ = exp_binop(GE , $1, $3); }
 539         |       exp '<' exp
 540                         { $$ = exp_binop('<' , $1, $3); }
 541         |       exp '>' exp
 542                         { $$ = exp_binop('>' , $1, $3); }
 543         |       exp '&' exp
 544                         { $$ = exp_binop('&' , $1, $3); }
 545         |       exp '^' exp
 546                         { $$ = exp_binop('^' , $1, $3); }
 547         |       exp '|' exp
 548                         { $$ = exp_binop('|' , $1, $3); }
 549         |       exp '?' exp ':' exp
 550                         { $$ = exp_trinop('?' , $1, $3, $5); }
 551         |       exp ANDAND exp
 552                         { $$ = exp_binop(ANDAND , $1, $3); }
 553         |       exp OROR exp
 554                         { $$ = exp_binop(OROR , $1, $3); }
 555         |       DEFINED '(' NAME ')'
 556                         { $$ = exp_nameop(DEFINED, $3); }
 557         |       INT
 558                         { $$ = exp_intop($1); }
 559         |       SIZEOF_HEADERS
 560                         { $$ = exp_nameop(SIZEOF_HEADERS,0); }
 561
 562         |       SIZEOF '(' NAME ')'
 563                         { $$ = exp_nameop(SIZEOF,$3); }
 564         |       ADDR '(' NAME ')'
 565                         { $$ = exp_nameop(ADDR,$3); }
 566         |       ABSOLUTE '(' exp ')'
 567                         { $$ = exp_unop(ABSOLUTE, $3); }
 568         |       ALIGN_K '(' exp ')'
 569                         { $$ = exp_unop(ALIGN_K,$3); }
 570         |       NAME
 571                         { $$ = exp_nameop(NAME,$1); }
 572         ;
 573
 574
 575 opt_at:
 576                 AT '(' exp ')' { $$ = $3; }
 577         |       { $$ = 0; }
 578         ;
 579
 580 section:        NAME            { ldlex_expression(); }
 581                 opt_exp_with_type
 582                 opt_at          { ldlex_popstate(); }
 583                 '{'
 584                         {
 585                         lang_enter_output_section_statement($1,$3,typebits,0,0,0,$4);
 586                         }
 587                 statement_list_opt
 588                 '}' {ldlex_expression();} memspec_opt fill_opt
 589                 {
 590                   ldlex_popstate();
 591                   lang_leave_output_section_statement($12, $11);
 592                 }
 593 opt_comma
 594
 595         ;
 596
 597 type:
 598            NOLOAD  { typebits = SEC_NEVER_LOAD; }
 599         |  DSECT   { typebits = 0; }
 600         |  COPY    { typebits = 0; }
 601         |  INFO    { typebits = 0; }
 602         |  OVERLAY { typebits = 0; }
 603         | { typebits = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; }
 604         ;
 605
 606
 607 opt_exp_with_type:
 608                 exp ':'                 { $$ = $1; typebits =0;}
 609         |       exp '(' type ')' ':'    { $$ = $1; }
 610         |       ':'                     { $$= (etree_type *)NULL; typebits = 0; }
 611         |       '(' type ')' ':'        { $$= (etree_type *)NULL;  }
 612         ;
 613
 614 memspec_opt:
 615                 '>' NAME
 616                 { $$ = $2; }
 617         |       { $$ = "*default*"; }
 618         ;
 619 %%
 620 void
 621 yyerror(arg)
 622      const char *arg;
 623 {
 624   if (error_index > 0 && error_index < ERROR_NAME_MAX)
 625      einfo("%P%F: %S %s in %s\n", arg, error_names[error_index-1]);
 626   else
 627      einfo("%P%F: %S %s\n", arg);
 628 }