1 /* A YACC grammar to parse a superset of the AT&T linker scripting language.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002 Free Software Foundation, Inc.
4 Written by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
6 This file is part of GNU ld.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
27 #define DONTDECLARE_MALLOC
48 static enum section_type sectype;
50 lang_memory_region_type *region;
52 boolean ldgram_want_filename = true;
53 FILE * saved_script_handle = NULL;
54 boolean force_make_executable = false;
56 boolean ldgram_in_script = false;
57 boolean ldgram_had_equals = false;
58 boolean ldgram_had_keep = false;
59 char *ldgram_vers_current_lang = NULL;
61 #define ERROR_NAME_MAX 20
62 static char *error_names[ERROR_NAME_MAX];
63 static int error_index;
64 #define PUSH_ERROR(x) if (error_index < ERROR_NAME_MAX) error_names[error_index] = x; error_index++;
65 #define POP_ERROR() error_index--;
77 struct wildcard_spec wildcard;
78 struct wildcard_list *wildcard_list;
79 struct name_list *name_list;
81 union etree_union *etree;
86 union etree_union *at;
87 union etree_union *flags;
89 struct lang_nocrossref *nocrossref;
90 struct lang_output_section_phdr_list *section_phdr;
91 struct bfd_elf_version_deps *deflist;
92 struct bfd_elf_version_expr *versyms;
93 struct bfd_elf_version_tree *versnode;
96 %type <etree> exp opt_exp_with_type mustbe_exp opt_at phdr_type phdr_val
97 %type <etree> opt_exp_without_type
98 %type <fill> fill_opt fill_exp
99 %type <name_list> exclude_name_list
100 %type <wildcard_list> file_NAME_list
101 %type <name> memspec_opt casesymlist
102 %type <name> memspec_at_opt
103 %type <cname> wildcard_name
104 %type <wildcard> wildcard_spec
106 %token <name> NAME LNAME
107 %type <integer> length
108 %type <phdr> phdr_qualifiers
109 %type <nocrossref> nocrossref_list
110 %type <section_phdr> phdr_opt
111 %type <integer> opt_nocrossrefs
113 %right <token> PLUSEQ MINUSEQ MULTEQ DIVEQ '=' LSHIFTEQ RSHIFTEQ ANDEQ OREQ
114 %right <token> '?' ':'
121 %left <token> '<' '>' LE GE
122 %left <token> LSHIFT RSHIFT
124 %left <token> '+' '-'
125 %left <token> '*' '/' '%'
130 %token <token> ALIGN_K BLOCK BIND QUAD SQUAD LONG SHORT BYTE
131 %token SECTIONS PHDRS SORT DATA_SEGMENT_ALIGN DATA_SEGMENT_END
133 %token SIZEOF_HEADERS OUTPUT_FORMAT FORCE_COMMON_ALLOCATION OUTPUT_ARCH
134 %token INHIBIT_COMMON_ALLOCATION
135 %token SIZEOF_HEADERS
137 %token MEMORY DEFSYMEND
138 %token NOLOAD DSECT COPY INFO OVERLAY
139 %token NAME LNAME DEFINED TARGET_K SEARCH_DIR MAP ENTRY
140 %token <integer> NEXT
141 %token SIZEOF ADDR LOADADDR MAX_K MIN_K
142 %token STARTUP HLL SYSLIB FLOAT NOFLOAT NOCROSSREFS
144 %token LENGTH CREATE_OBJECT_SYMBOLS INPUT GROUP OUTPUT CONSTRUCTORS
145 %token ALIGNMOD AT PROVIDE
146 %type <token> assign_op atype attributes_opt
147 %type <name> filename
148 %token CHIP LIST SECT ABSOLUTE LOAD NEWLINE ENDWORD ORDER NAMEWORD ASSERT_K
149 %token FORMAT PUBLIC DEFSYMEND BASE ALIAS TRUNCATE REL
150 %token INPUT_SCRIPT INPUT_MRI_SCRIPT INPUT_DEFSYM CASE EXTERN START
151 %token <name> VERS_TAG VERS_IDENTIFIER
152 %token GLOBAL LOCAL VERSIONK INPUT_VERSION_SCRIPT
155 %type <versyms> vers_defns
156 %type <versnode> vers_tag
157 %type <deflist> verdep
162 INPUT_SCRIPT script_file
163 | INPUT_MRI_SCRIPT mri_script_file
164 | INPUT_VERSION_SCRIPT version_script_file
165 | INPUT_DEFSYM defsym_expr
177 lang_add_assignment(exp_assop($3,$2,$4));
181 /* SYNTAX WITHIN AN MRI SCRIPT FILE */
185 PUSH_ERROR (_("MRI style script"));
196 mri_script_lines mri_script_command NEWLINE
204 einfo(_("%P%F: unrecognised keyword in MRI style script '%s'\n"),$1);
207 config.map_filename = "-";
209 | ORDER ordernamelist
211 | PUBLIC NAME '=' exp
212 { mri_public($2, $4); }
213 | PUBLIC NAME ',' exp
214 { mri_public($2, $4); }
216 { mri_public($2, $3); }
220 { mri_output_section($2, $4);}
222 { mri_output_section($2, $3);}
224 { mri_output_section($2, $4);}
225 | ALIGN_K NAME '=' exp
226 { mri_align($2,$4); }
227 | ALIGN_K NAME ',' exp
228 { mri_align($2,$4); }
229 | ALIGNMOD NAME '=' exp
230 { mri_alignmod($2,$4); }
231 | ALIGNMOD NAME ',' exp
232 { mri_alignmod($2,$4); }
233 | ABSOLUTE mri_abs_name_list
234 | LOAD mri_load_name_list
237 | ALIAS NAME ',' NAME
238 { mri_alias($2,$4,0);}
240 { mri_alias ($2, 0, (int) $4.integer); }
244 { mri_truncate ((unsigned int) $2.integer); }
246 | EXTERN extern_name_list
248 { ldlex_script (); ldfile_open_command_file($2); }
250 { ldlex_popstate (); }
252 { lang_add_entry ($2, false); }
257 ordernamelist ',' NAME { mri_order($3); }
258 | ordernamelist NAME { mri_order($2); }
265 | mri_load_name_list ',' NAME { mri_load($3); }
270 { mri_only_load($1); }
271 | mri_abs_name_list ',' NAME
272 { mri_only_load($3); }
276 /* empty */ { $$ = NULL; }
278 | casesymlist ',' NAME
283 { ldlang_add_undef ($1); }
284 | extern_name_list NAME
285 { ldlang_add_undef ($2); }
286 | extern_name_list ',' NAME
287 { ldlang_add_undef ($3); }
315 | floating_point_support
319 | TARGET_K '(' NAME ')'
320 { lang_add_target($3); }
321 | SEARCH_DIR '(' filename ')'
322 { ldfile_add_library_path ($3, false); }
323 | OUTPUT '(' filename ')'
324 { lang_add_output($3, 1); }
325 | OUTPUT_FORMAT '(' NAME ')'
326 { lang_add_output_format ($3, (char *) NULL,
328 | OUTPUT_FORMAT '(' NAME ',' NAME ',' NAME ')'
329 { lang_add_output_format ($3, $5, $7, 1); }
330 | OUTPUT_ARCH '(' NAME ')'
331 { ldfile_set_output_arch($3); }
332 | FORCE_COMMON_ALLOCATION
333 { command_line.force_common_definition = true ; }
334 | INHIBIT_COMMON_ALLOCATION
335 { command_line.inhibit_common_definition = true ; }
336 | INPUT '(' input_list ')'
338 { lang_enter_group (); }
340 { lang_leave_group (); }
341 | MAP '(' filename ')'
342 { lang_add_map($3); }
344 { ldlex_script (); ldfile_open_command_file($2); }
346 { ldlex_popstate (); }
347 | NOCROSSREFS '(' nocrossref_list ')'
349 lang_add_nocrossref ($3);
351 | EXTERN '(' extern_name_list ')'
356 { lang_add_input_file($1,lang_input_file_is_search_file_enum,
358 | input_list ',' NAME
359 { lang_add_input_file($3,lang_input_file_is_search_file_enum,
362 { lang_add_input_file($2,lang_input_file_is_search_file_enum,
365 { lang_add_input_file($1,lang_input_file_is_l_enum,
367 | input_list ',' LNAME
368 { lang_add_input_file($3,lang_input_file_is_l_enum,
371 { lang_add_input_file($2,lang_input_file_is_l_enum,
376 SECTIONS '{' sec_or_group_p1 '}'
380 sec_or_group_p1 section
381 | sec_or_group_p1 statement_anywhere
387 { lang_add_entry ($3, false); }
391 /* The '*' and '?' cases are there because the lexer returns them as
392 separate tokens rather than as NAME. */
413 $$.exclude_name_list = NULL;
415 | EXCLUDE_FILE '(' exclude_name_list ')' wildcard_name
419 $$.exclude_name_list = $3;
421 | SORT '(' wildcard_name ')'
425 $$.exclude_name_list = NULL;
427 | SORT '(' EXCLUDE_FILE '(' exclude_name_list ')' wildcard_name ')'
431 $$.exclude_name_list = $5;
436 exclude_name_list wildcard_name
438 struct name_list *tmp;
439 tmp = (struct name_list *) xmalloc (sizeof *tmp);
447 struct name_list *tmp;
448 tmp = (struct name_list *) xmalloc (sizeof *tmp);
456 file_NAME_list opt_comma wildcard_spec
458 struct wildcard_list *tmp;
459 tmp = (struct wildcard_list *) xmalloc (sizeof *tmp);
467 struct wildcard_list *tmp;
468 tmp = (struct wildcard_list *) xmalloc (sizeof *tmp);
475 input_section_spec_no_keep:
478 struct wildcard_spec tmp;
480 tmp.exclude_name_list = NULL;
482 lang_add_wild (&tmp, NULL, ldgram_had_keep);
484 | '[' file_NAME_list ']'
486 lang_add_wild (NULL, $2, ldgram_had_keep);
488 | wildcard_spec '(' file_NAME_list ')'
490 lang_add_wild (&$1, $3, ldgram_had_keep);
495 input_section_spec_no_keep
497 { ldgram_had_keep = true; }
498 input_section_spec_no_keep ')'
499 { ldgram_had_keep = false; }
504 | CREATE_OBJECT_SYMBOLS
506 lang_add_attribute(lang_object_symbols_statement_enum);
512 lang_add_attribute(lang_constructors_statement_enum);
514 | SORT '(' CONSTRUCTORS ')'
516 constructors_sorted = true;
517 lang_add_attribute (lang_constructors_statement_enum);
520 | length '(' mustbe_exp ')'
522 lang_add_data ((int) $1, $3);
525 | FILL '(' fill_exp ')'
532 statement_list statement
557 $$ = exp_get_fill ($1,
560 lang_first_phase_enum);
567 | { $$ = (fill_type *) 0; }
597 lang_add_assignment (exp_assop ($2, $1, $3));
599 | NAME assign_op mustbe_exp
601 lang_add_assignment (exp_assop ('=', $1,
607 | PROVIDE '(' NAME '=' mustbe_exp ')'
609 lang_add_assignment (exp_provide ($3, $5));
619 MEMORY '{' memory_spec memory_spec_list '}'
623 memory_spec_list memory_spec
624 | memory_spec_list ',' memory_spec
630 { region = lang_memory_region_lookup($1); }
632 origin_spec opt_comma length_spec
637 ORIGIN '=' mustbe_exp
640 exp_get_vma($3, 0L,"origin", lang_first_phase_enum);
645 LENGTH '=' mustbe_exp
646 { region->length = exp_get_vma($3,
649 lang_first_phase_enum);
655 { /* dummy action to avoid bison 1.25 error message */ }
656 | '(' attributes_list ')'
661 | attributes_list attributes_string
666 { lang_set_flags (region, $1, 0); }
668 { lang_set_flags (region, $2, 1); }
672 STARTUP '(' filename ')'
673 { lang_startup($3); }
677 HLL '(' high_level_library_NAME_list ')'
679 { ldemul_hll((char *)NULL); }
682 high_level_library_NAME_list:
683 high_level_library_NAME_list opt_comma filename
691 SYSLIB '(' low_level_library_NAME_list ')'
692 ; low_level_library_NAME_list:
693 low_level_library_NAME_list opt_comma filename
694 { ldemul_syslib($3); }
698 floating_point_support:
700 { lang_float(true); }
702 { lang_float(false); }
710 | NAME nocrossref_list
712 struct lang_nocrossref *n;
714 n = (struct lang_nocrossref *) xmalloc (sizeof *n);
719 | NAME ',' nocrossref_list
721 struct lang_nocrossref *n;
723 n = (struct lang_nocrossref *) xmalloc (sizeof *n);
730 mustbe_exp: { ldlex_expression(); }
732 { ldlex_popstate(); $$=$2;}
737 { $$ = exp_unop('-', $2); }
740 | NEXT '(' exp ')' %prec UNARY
741 { $$ = exp_unop((int) $1,$3); }
742 | '!' exp %prec UNARY
743 { $$ = exp_unop('!', $2); }
744 | '+' exp %prec UNARY
746 | '~' exp %prec UNARY
747 { $$ = exp_unop('~', $2);}
750 { $$ = exp_binop('*', $1, $3); }
752 { $$ = exp_binop('/', $1, $3); }
754 { $$ = exp_binop('%', $1, $3); }
756 { $$ = exp_binop('+', $1, $3); }
758 { $$ = exp_binop('-' , $1, $3); }
760 { $$ = exp_binop(LSHIFT , $1, $3); }
762 { $$ = exp_binop(RSHIFT , $1, $3); }
764 { $$ = exp_binop(EQ , $1, $3); }
766 { $$ = exp_binop(NE , $1, $3); }
768 { $$ = exp_binop(LE , $1, $3); }
770 { $$ = exp_binop(GE , $1, $3); }
772 { $$ = exp_binop('<' , $1, $3); }
774 { $$ = exp_binop('>' , $1, $3); }
776 { $$ = exp_binop('&' , $1, $3); }
778 { $$ = exp_binop('^' , $1, $3); }
780 { $$ = exp_binop('|' , $1, $3); }
781 | exp '?' exp ':' exp
782 { $$ = exp_trinop('?' , $1, $3, $5); }
784 { $$ = exp_binop(ANDAND , $1, $3); }
786 { $$ = exp_binop(OROR , $1, $3); }
787 | DEFINED '(' NAME ')'
788 { $$ = exp_nameop(DEFINED, $3); }
790 { $$ = exp_bigintop ($1.integer, $1.str); }
792 { $$ = exp_nameop(SIZEOF_HEADERS,0); }
794 | SIZEOF '(' NAME ')'
795 { $$ = exp_nameop(SIZEOF,$3); }
797 { $$ = exp_nameop(ADDR,$3); }
798 | LOADADDR '(' NAME ')'
799 { $$ = exp_nameop(LOADADDR,$3); }
800 | ABSOLUTE '(' exp ')'
801 { $$ = exp_unop(ABSOLUTE, $3); }
802 | ALIGN_K '(' exp ')'
803 { $$ = exp_unop(ALIGN_K,$3); }
804 | DATA_SEGMENT_ALIGN '(' exp ',' exp ')'
805 { $$ = exp_binop (DATA_SEGMENT_ALIGN, $3, $5); }
806 | DATA_SEGMENT_END '(' exp ')'
807 { $$ = exp_unop(DATA_SEGMENT_END, $3); }
809 { $$ = exp_unop(ALIGN_K,$3); }
811 { $$ = exp_nameop(NAME,$1); }
812 | MAX_K '(' exp ',' exp ')'
813 { $$ = exp_binop (MAX_K, $3, $5 ); }
814 | MIN_K '(' exp ',' exp ')'
815 { $$ = exp_binop (MIN_K, $3, $5 ); }
816 | ASSERT_K '(' exp ',' NAME ')'
817 { $$ = exp_assert ($3, $5); }
822 AT '>' NAME { $$ = $3; }
827 AT '(' exp ')' { $$ = $3; }
831 section: NAME { ldlex_expression(); }
833 opt_at { ldlex_popstate (); ldlex_script (); }
836 lang_enter_output_section_statement($1, $3,
841 '}' { ldlex_popstate (); ldlex_expression (); }
842 memspec_opt memspec_at_opt phdr_opt fill_opt
845 lang_leave_output_section_statement ($14, $11, $13, $12);
849 { ldlex_expression (); }
850 opt_exp_without_type opt_nocrossrefs opt_at
851 { ldlex_popstate (); ldlex_script (); }
854 lang_enter_overlay ($3);
858 { ldlex_popstate (); ldlex_expression (); }
859 memspec_opt memspec_at_opt phdr_opt fill_opt
862 lang_leave_overlay ($5, (int) $4,
866 | /* The GROUP case is just enough to support the gcc
867 svr3.ifile script. It is not intended to be full
868 support. I'm not even sure what GROUP is supposed
870 GROUP { ldlex_expression (); }
874 lang_add_assignment (exp_assop ('=', ".", $3));
876 '{' sec_or_group_p1 '}'
880 NOLOAD { sectype = noload_section; }
881 | DSECT { sectype = dsect_section; }
882 | COPY { sectype = copy_section; }
883 | INFO { sectype = info_section; }
884 | OVERLAY { sectype = overlay_section; }
889 | /* EMPTY */ { sectype = normal_section; }
890 | '(' ')' { sectype = normal_section; }
894 exp atype ':' { $$ = $1; }
895 | atype ':' { $$ = (etree_type *)NULL; }
896 | /* The BIND cases are to support the gcc svr3.ifile
897 script. They aren't intended to implement full
898 support for the BIND keyword. I'm not even sure
899 what BIND is supposed to mean. */
900 BIND '(' exp ')' atype ':' { $$ = $3; }
901 | BIND '(' exp ')' BLOCK '(' exp ')' atype ':'
905 opt_exp_without_type:
907 | ':' { $$ = (etree_type *) NULL; }
920 | { $$ = "*default*"; }
930 struct lang_output_section_phdr_list *n;
932 n = ((struct lang_output_section_phdr_list *)
933 xmalloc (sizeof *n));
947 lang_enter_overlay_section ($2);
949 '{' statement_list_opt '}'
950 { ldlex_popstate (); ldlex_expression (); }
954 lang_leave_overlay_section ($9, $8);
960 PHDRS '{' phdr_list '}'
969 NAME { ldlex_expression (); }
970 phdr_type phdr_qualifiers { ldlex_popstate (); }
973 lang_new_phdr ($1, $3, $4.filehdr, $4.phdrs, $4.at,
983 if ($1->type.node_class == etree_name
984 && $1->type.node_code == NAME)
988 static const char * const phdr_types[] =
990 "PT_NULL", "PT_LOAD", "PT_DYNAMIC",
991 "PT_INTERP", "PT_NOTE", "PT_SHLIB",
997 i < sizeof phdr_types / sizeof phdr_types[0];
999 if (strcmp (s, phdr_types[i]) == 0)
1011 memset (&$$, 0, sizeof (struct phdr_info));
1013 | NAME phdr_val phdr_qualifiers
1016 if (strcmp ($1, "FILEHDR") == 0 && $2 == NULL)
1018 else if (strcmp ($1, "PHDRS") == 0 && $2 == NULL)
1020 else if (strcmp ($1, "FLAGS") == 0 && $2 != NULL)
1023 einfo (_("%X%P:%S: PHDRS syntax error at `%s'\n"), $1);
1025 | AT '(' exp ')' phdr_qualifiers
1043 /* This syntax is used within an external version script file. */
1045 version_script_file:
1047 ldlex_version_file ();
1048 PUSH_ERROR (_("VERSION script"));
1057 /* This is used within a normal linker script file. */
1061 ldlex_version_script ();
1063 VERSIONK '{' vers_nodes '}'
1071 | vers_nodes vers_node
1075 '{' vers_tag '}' ';'
1077 lang_register_vers_node (NULL, $2, NULL);
1079 | VERS_TAG '{' vers_tag '}' ';'
1081 lang_register_vers_node ($1, $3, NULL);
1083 | VERS_TAG '{' vers_tag '}' verdep ';'
1085 lang_register_vers_node ($1, $3, $5);
1092 $$ = lang_add_vers_depend (NULL, $1);
1096 $$ = lang_add_vers_depend ($1, $2);
1103 $$ = lang_new_vers_node (NULL, NULL);
1107 $$ = lang_new_vers_node ($1, NULL);
1109 | GLOBAL ':' vers_defns ';'
1111 $$ = lang_new_vers_node ($3, NULL);
1113 | LOCAL ':' vers_defns ';'
1115 $$ = lang_new_vers_node (NULL, $3);
1117 | GLOBAL ':' vers_defns ';' LOCAL ':' vers_defns ';'
1119 $$ = lang_new_vers_node ($3, $7);
1126 $$ = lang_new_vers_pattern (NULL, $1, ldgram_vers_current_lang);
1128 | vers_defns ';' VERS_IDENTIFIER
1130 $$ = lang_new_vers_pattern ($1, $3, ldgram_vers_current_lang);
1134 $<name>$ = ldgram_vers_current_lang;
1135 ldgram_vers_current_lang = $2;
1140 ldgram_vers_current_lang = $<name>4;
1149 if (ldfile_assumed_script)
1150 einfo (_("%P:%s: file format not recognized; treating as linker script\n"),
1151 ldfile_input_filename);
1152 if (error_index > 0 && error_index < ERROR_NAME_MAX)
1153 einfo ("%P%F:%S: %s in %s\n", arg, error_names[error_index-1]);
1155 einfo ("%P%F:%S: %s\n", arg);