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