| 1 | /* ldexp.h - |
| 2 | Copyright (C) 1991-2016 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of the GNU Binutils. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 19 | MA 02110-1301, USA. */ |
| 20 | |
| 21 | #ifndef LDEXP_H |
| 22 | #define LDEXP_H |
| 23 | |
| 24 | /* The result of an expression tree */ |
| 25 | typedef struct { |
| 26 | bfd_vma value; |
| 27 | char *str; |
| 28 | asection *section; |
| 29 | bfd_boolean valid_p; |
| 30 | } etree_value_type; |
| 31 | |
| 32 | enum node_tree_enum { |
| 33 | etree_binary, |
| 34 | etree_trinary, |
| 35 | etree_unary, |
| 36 | etree_name, |
| 37 | etree_assign, |
| 38 | etree_provide, |
| 39 | etree_provided, |
| 40 | etree_value, |
| 41 | etree_assert, |
| 42 | etree_rel |
| 43 | }; |
| 44 | |
| 45 | typedef struct { |
| 46 | int node_code; |
| 47 | unsigned int lineno; |
| 48 | const char *filename; |
| 49 | enum node_tree_enum node_class; |
| 50 | } node_type; |
| 51 | |
| 52 | typedef union etree_union { |
| 53 | node_type type; |
| 54 | struct { |
| 55 | node_type type; |
| 56 | union etree_union *lhs; |
| 57 | union etree_union *rhs; |
| 58 | } binary; |
| 59 | struct { |
| 60 | node_type type; |
| 61 | union etree_union *cond; |
| 62 | union etree_union *lhs; |
| 63 | union etree_union *rhs; |
| 64 | } trinary; |
| 65 | struct { |
| 66 | node_type type; |
| 67 | const char *dst; |
| 68 | union etree_union *src; |
| 69 | bfd_boolean defsym; |
| 70 | bfd_boolean hidden; |
| 71 | } assign; |
| 72 | struct { |
| 73 | node_type type; |
| 74 | union etree_union *child; |
| 75 | } unary; |
| 76 | struct { |
| 77 | node_type type; |
| 78 | const char *name; |
| 79 | } name; |
| 80 | struct { |
| 81 | node_type type; |
| 82 | bfd_vma value; |
| 83 | char *str; |
| 84 | } value; |
| 85 | struct { |
| 86 | node_type type; |
| 87 | asection *section; |
| 88 | bfd_vma value; |
| 89 | } rel; |
| 90 | struct { |
| 91 | node_type type; |
| 92 | union etree_union *child; |
| 93 | const char *message; |
| 94 | } assert_s; |
| 95 | } etree_type; |
| 96 | |
| 97 | /* Expression evaluation control. */ |
| 98 | typedef enum |
| 99 | { |
| 100 | /* Parsing linker script. Will only return "valid" for expressions |
| 101 | that evaluate to a constant. */ |
| 102 | lang_first_phase_enum, |
| 103 | /* Prior to section sizing. */ |
| 104 | lang_mark_phase_enum, |
| 105 | /* During section sizing. */ |
| 106 | lang_allocating_phase_enum, |
| 107 | /* During assignment of symbol values when relaxation in progress. */ |
| 108 | lang_assigning_phase_enum, |
| 109 | /* Final assignment of symbol values. */ |
| 110 | lang_final_phase_enum |
| 111 | } lang_phase_type; |
| 112 | |
| 113 | union lang_statement_union; |
| 114 | |
| 115 | enum phase_enum { |
| 116 | /* We step through the first four states here as we see the |
| 117 | associated linker script tokens. */ |
| 118 | exp_dataseg_none, |
| 119 | exp_dataseg_align_seen, |
| 120 | exp_dataseg_relro_seen, |
| 121 | exp_dataseg_end_seen, |
| 122 | /* The last three states are final, and affect the value returned |
| 123 | by DATA_SEGMENT_ALIGN. */ |
| 124 | exp_dataseg_relro_adjust, |
| 125 | exp_dataseg_adjust, |
| 126 | exp_dataseg_done |
| 127 | }; |
| 128 | |
| 129 | enum relro_enum { |
| 130 | exp_dataseg_relro_none, |
| 131 | exp_dataseg_relro_start, |
| 132 | exp_dataseg_relro_end, |
| 133 | }; |
| 134 | |
| 135 | struct ldexp_control { |
| 136 | /* Modify expression evaluation depending on this. */ |
| 137 | lang_phase_type phase; |
| 138 | |
| 139 | /* Principally used for diagnostics. */ |
| 140 | bfd_boolean assigning_to_dot; |
| 141 | |
| 142 | /* Set if the current expression used "dot", SEGMENT_START or |
| 143 | ORIGIN, but not ABSOLUTE or combined symbols in a way that forces |
| 144 | an absolute result. Used in tracking symbols assigned from dot |
| 145 | outside of output section statements, in order to later convert |
| 146 | them from absolute. */ |
| 147 | bfd_boolean rel_from_abs; |
| 148 | |
| 149 | /* If evaluating an assignment, the destination. Cleared if an |
| 150 | etree_name NAME matches this, to signal a self-assignment. |
| 151 | Note that an etree_name DEFINED does not clear this field, nor |
| 152 | does the false branch of a trinary expression. */ |
| 153 | const char *assign_name; |
| 154 | |
| 155 | /* Working results. */ |
| 156 | etree_value_type result; |
| 157 | bfd_vma dot; |
| 158 | |
| 159 | /* Current dot and section passed to ldexp folder. */ |
| 160 | bfd_vma *dotp; |
| 161 | asection *section; |
| 162 | |
| 163 | /* State machine and results for DATASEG. */ |
| 164 | struct { |
| 165 | enum phase_enum phase; |
| 166 | |
| 167 | bfd_vma base, relro_offset, relro_end, end, pagesize, maxpagesize; |
| 168 | |
| 169 | enum relro_enum relro; |
| 170 | |
| 171 | union lang_statement_union *relro_start_stat; |
| 172 | union lang_statement_union *relro_end_stat; |
| 173 | } dataseg; |
| 174 | }; |
| 175 | |
| 176 | extern struct ldexp_control expld; |
| 177 | |
| 178 | /* A maps from a segment name to a base address. */ |
| 179 | typedef struct segment_struct { |
| 180 | /* The next segment in the linked list. */ |
| 181 | struct segment_struct *next; |
| 182 | /* The name of the sgement. */ |
| 183 | const char *name; |
| 184 | /* The base address for the segment. */ |
| 185 | bfd_vma value; |
| 186 | /* True if a SEGMENT_START directive corresponding to this segment |
| 187 | has been seen. */ |
| 188 | bfd_boolean used; |
| 189 | } segment_type; |
| 190 | |
| 191 | /* The segments specified by the user on the command-line. */ |
| 192 | extern segment_type *segments; |
| 193 | |
| 194 | typedef struct _fill_type fill_type; |
| 195 | |
| 196 | etree_type *exp_intop |
| 197 | (bfd_vma); |
| 198 | etree_type *exp_bigintop |
| 199 | (bfd_vma, char *); |
| 200 | etree_type *exp_relop |
| 201 | (asection *, bfd_vma); |
| 202 | void exp_fold_tree |
| 203 | (etree_type *, asection *, bfd_vma *); |
| 204 | void exp_fold_tree_no_dot |
| 205 | (etree_type *); |
| 206 | etree_type *exp_binop |
| 207 | (int, etree_type *, etree_type *); |
| 208 | etree_type *exp_trinop |
| 209 | (int,etree_type *, etree_type *, etree_type *); |
| 210 | etree_type *exp_unop |
| 211 | (int, etree_type *); |
| 212 | etree_type *exp_nameop |
| 213 | (int, const char *); |
| 214 | etree_type *exp_assign |
| 215 | (const char *, etree_type *, bfd_boolean); |
| 216 | etree_type *exp_defsym |
| 217 | (const char *, etree_type *); |
| 218 | etree_type *exp_provide |
| 219 | (const char *, etree_type *, bfd_boolean); |
| 220 | etree_type *exp_assert |
| 221 | (etree_type *, const char *); |
| 222 | void exp_print_tree |
| 223 | (etree_type *); |
| 224 | bfd_vma exp_get_vma |
| 225 | (etree_type *, bfd_vma, char *); |
| 226 | int exp_get_value_int |
| 227 | (etree_type *, int, char *); |
| 228 | fill_type *exp_get_fill |
| 229 | (etree_type *, fill_type *, char *); |
| 230 | bfd_vma exp_get_abs_int |
| 231 | (etree_type *, int, char *); |
| 232 | void ldexp_init (void); |
| 233 | void ldexp_finalize_syms (void); |
| 234 | void ldexp_finish (void); |
| 235 | |
| 236 | #endif |